2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i, shift = 0;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
49 struct ieee80211_chanctx_conf *chanctx_conf;
53 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
55 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
56 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
60 /* assume HW handles this */
61 if (tx->rate.flags & IEEE80211_TX_RC_MCS)
65 if (WARN_ON_ONCE(tx->rate.idx < 0))
68 sband = local->hw.wiphy->bands[info->band];
69 txrate = &sband->bitrates[tx->rate.idx];
71 erp = txrate->flags & IEEE80211_RATE_ERP_G;
74 * data and mgmt (except PS Poll):
76 * - during contention period:
77 * if addr1 is group address: 0
78 * if more fragments = 0 and addr1 is individual address: time to
79 * transmit one ACK plus SIFS
80 * if more fragments = 1 and addr1 is individual address: time to
81 * transmit next fragment plus 2 x ACK plus 3 x SIFS
84 * - control response frame (CTS or ACK) shall be transmitted using the
85 * same rate as the immediately previous frame in the frame exchange
86 * sequence, if this rate belongs to the PHY mandatory rates, or else
87 * at the highest possible rate belonging to the PHY rates in the
90 hdr = (struct ieee80211_hdr *)skb->data;
91 if (ieee80211_is_ctl(hdr->frame_control)) {
92 /* TODO: These control frames are not currently sent by
93 * mac80211, but should they be implemented, this function
94 * needs to be updated to support duration field calculation.
96 * RTS: time needed to transmit pending data/mgmt frame plus
97 * one CTS frame plus one ACK frame plus 3 x SIFS
98 * CTS: duration of immediately previous RTS minus time
99 * required to transmit CTS and its SIFS
100 * ACK: 0 if immediately previous directed data/mgmt had
101 * more=0, with more=1 duration in ACK frame is duration
102 * from previous frame minus time needed to transmit ACK
104 * PS Poll: BIT(15) | BIT(14) | aid
110 if (0 /* FIX: data/mgmt during CFP */)
111 return cpu_to_le16(32768);
113 if (group_addr) /* Group address as the destination - no ACK */
116 /* Individual destination address:
117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
118 * CTS and ACK frames shall be transmitted using the highest rate in
119 * basic rate set that is less than or equal to the rate of the
120 * immediately previous frame and that is using the same modulation
121 * (CCK or OFDM). If no basic rate set matches with these requirements,
122 * the highest mandatory rate of the PHY that is less than or equal to
123 * the rate of the previous frame is used.
124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
127 /* use lowest available if everything fails */
128 mrate = sband->bitrates[0].bitrate;
129 for (i = 0; i < sband->n_bitrates; i++) {
130 struct ieee80211_rate *r = &sband->bitrates[i];
132 if (r->bitrate > txrate->bitrate)
135 if ((rate_flags & r->flags) != rate_flags)
138 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
139 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
141 switch (sband->band) {
142 case IEEE80211_BAND_2GHZ: {
144 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
145 flag = IEEE80211_RATE_MANDATORY_G;
147 flag = IEEE80211_RATE_MANDATORY_B;
152 case IEEE80211_BAND_5GHZ:
153 if (r->flags & IEEE80211_RATE_MANDATORY_A)
156 case IEEE80211_BAND_60GHZ:
157 /* TODO, for now fall through */
158 case IEEE80211_NUM_BANDS:
164 /* No matching basic rate found; use highest suitable mandatory
166 rate = DIV_ROUND_UP(mrate, 1 << shift);
169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
170 if (ieee80211_is_data_qos(hdr->frame_control) &&
171 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
178 tx->sdata->vif.bss_conf.use_short_preamble,
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
186 dur += ieee80211_frame_duration(sband->band, next_frag_len,
187 txrate->bitrate, erp,
188 tx->sdata->vif.bss_conf.use_short_preamble,
192 return cpu_to_le16(dur);
196 static ieee80211_tx_result debug_noinline
197 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
199 struct ieee80211_local *local = tx->local;
200 struct ieee80211_if_managed *ifmgd;
202 /* driver doesn't support power save */
203 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
206 /* hardware does dynamic power save */
207 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
210 /* dynamic power save disabled */
211 if (local->hw.conf.dynamic_ps_timeout <= 0)
214 /* we are scanning, don't enable power save */
218 if (!local->ps_sdata)
221 /* No point if we're going to suspend */
222 if (local->quiescing)
225 /* dynamic ps is supported only in managed mode */
226 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
229 ifmgd = &tx->sdata->u.mgd;
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
249 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
250 ieee80211_stop_queues_by_reason(&local->hw,
251 IEEE80211_MAX_QUEUE_MAP,
252 IEEE80211_QUEUE_STOP_REASON_PS);
253 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
254 ieee80211_queue_work(&local->hw,
255 &local->dynamic_ps_disable_work);
258 /* Don't restart the timer if we're not disassociated */
259 if (!ifmgd->associated)
262 mod_timer(&local->dynamic_ps_timer, jiffies +
263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
268 static ieee80211_tx_result debug_noinline
269 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
279 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
280 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
281 !ieee80211_is_probe_req(hdr->frame_control) &&
282 !ieee80211_is_nullfunc(hdr->frame_control))
284 * When software scanning only nullfunc frames (to notify
285 * the sleep state to the AP) and probe requests (for the
286 * active scan) are allowed, all other frames should not be
287 * sent and we should not get here, but if we do
288 * nonetheless, drop them to avoid sending them
289 * off-channel. See the link below and
290 * ieee80211_start_scan() for more.
292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
296 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
299 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
302 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
306 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
308 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
309 if (unlikely(!assoc &&
310 ieee80211_is_data(hdr->frame_control))) {
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
312 sdata_info(tx->sdata,
313 "dropped data frame to not associated station %pM\n",
316 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
319 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
320 ieee80211_is_data(hdr->frame_control) &&
321 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
323 * No associated STAs - no need to send multicast
332 /* This function is called whenever the AP is about to exceed the maximum limit
333 * of buffered frames for power saving STAs. This situation should not really
334 * happen often during normal operation, so dropping the oldest buffered packet
335 * from each queue should be OK to make some room for new frames. */
336 static void purge_old_ps_buffers(struct ieee80211_local *local)
338 int total = 0, purged = 0;
340 struct ieee80211_sub_if_data *sdata;
341 struct sta_info *sta;
343 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
346 if (sdata->vif.type == NL80211_IFTYPE_AP)
347 ps = &sdata->u.ap.ps;
348 else if (ieee80211_vif_is_mesh(&sdata->vif))
349 ps = &sdata->u.mesh.ps;
353 skb = skb_dequeue(&ps->bc_buf);
358 total += skb_queue_len(&ps->bc_buf);
362 * Drop one frame from each station from the lowest-priority
363 * AC that has frames at all.
365 list_for_each_entry_rcu(sta, &local->sta_list, list) {
368 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
369 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
370 total += skb_queue_len(&sta->ps_tx_buf[ac]);
373 ieee80211_free_txskb(&local->hw, skb);
379 local->total_ps_buffered = total;
380 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
383 static ieee80211_tx_result
384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
391 * broadcast/multicast frame
393 * If any of the associated/peer stations is in power save mode,
394 * the frame is buffered to be sent after DTIM beacon frame.
395 * This is done either by the hardware or us.
398 /* powersaving STAs currently only in AP/VLAN/mesh mode */
399 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
400 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
404 ps = &tx->sdata->bss->ps;
405 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
406 ps = &tx->sdata->u.mesh.ps;
412 /* no buffering for ordered frames */
413 if (ieee80211_has_order(hdr->frame_control))
416 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
417 info->hw_queue = tx->sdata->vif.cab_queue;
419 /* no stations in PS mode */
420 if (!atomic_read(&ps->num_sta_ps))
423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
425 /* device releases frame after DTIM beacon */
426 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
429 /* buffered in mac80211 */
430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
431 purge_old_ps_buffers(tx->local);
433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
435 "BC TX buffer full - dropping the oldest frame\n");
436 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
438 tx->local->total_ps_buffered++;
440 skb_queue_tail(&ps->bc_buf, tx->skb);
445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
448 if (!ieee80211_is_mgmt(fc))
451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
461 static ieee80211_tx_result
462 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
464 struct sta_info *sta = tx->sta;
465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
466 struct ieee80211_local *local = tx->local;
471 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
472 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
473 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
474 int ac = skb_get_queue_mapping(tx->skb);
476 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
477 sta->sta.addr, sta->sta.aid, ac);
478 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
479 purge_old_ps_buffers(tx->local);
480 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
481 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
483 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
485 ieee80211_free_txskb(&local->hw, old);
487 tx->local->total_ps_buffered++;
489 info->control.jiffies = jiffies;
490 info->control.vif = &tx->sdata->vif;
491 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
492 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
494 if (!timer_pending(&local->sta_cleanup))
495 mod_timer(&local->sta_cleanup,
496 round_jiffies(jiffies +
497 STA_INFO_CLEANUP_INTERVAL));
500 * We queued up some frames, so the TIM bit might
501 * need to be set, recalculate it.
503 sta_info_recalc_tim(sta);
506 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
508 "STA %pM in PS mode, but polling/in SP -> send frame\n",
515 static ieee80211_tx_result debug_noinline
516 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
518 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
519 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
521 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
524 /* only deauth, disassoc and action are bufferable MMPDUs */
525 if (ieee80211_is_mgmt(hdr->frame_control) &&
526 !ieee80211_is_deauth(hdr->frame_control) &&
527 !ieee80211_is_disassoc(hdr->frame_control) &&
528 !ieee80211_is_action(hdr->frame_control)) {
529 if (tx->flags & IEEE80211_TX_UNICAST)
530 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
534 if (tx->flags & IEEE80211_TX_UNICAST)
535 return ieee80211_tx_h_unicast_ps_buf(tx);
537 return ieee80211_tx_h_multicast_ps_buf(tx);
540 static ieee80211_tx_result debug_noinline
541 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
543 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
545 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
546 if (tx->sdata->control_port_no_encrypt)
547 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
548 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
557 struct ieee80211_key *key;
558 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
559 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
561 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
563 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
565 else if (ieee80211_is_mgmt(hdr->frame_control) &&
566 is_multicast_ether_addr(hdr->addr1) &&
567 ieee80211_is_robust_mgmt_frame(hdr) &&
568 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
570 else if (is_multicast_ether_addr(hdr->addr1) &&
571 (key = rcu_dereference(tx->sdata->default_multicast_key)))
573 else if (!is_multicast_ether_addr(hdr->addr1) &&
574 (key = rcu_dereference(tx->sdata->default_unicast_key)))
576 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
578 else if (!tx->sdata->drop_unencrypted)
580 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
582 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
583 !(ieee80211_is_action(hdr->frame_control) &&
584 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
586 else if (ieee80211_is_mgmt(hdr->frame_control) &&
587 !ieee80211_is_robust_mgmt_frame(hdr))
590 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
595 bool skip_hw = false;
597 tx->key->tx_rx_count++;
598 /* TODO: add threshold stuff again */
600 switch (tx->key->conf.cipher) {
601 case WLAN_CIPHER_SUITE_WEP40:
602 case WLAN_CIPHER_SUITE_WEP104:
603 case WLAN_CIPHER_SUITE_TKIP:
604 if (!ieee80211_is_data_present(hdr->frame_control))
607 case WLAN_CIPHER_SUITE_CCMP:
608 if (!ieee80211_is_data_present(hdr->frame_control) &&
609 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
613 skip_hw = (tx->key->conf.flags &
614 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
615 ieee80211_is_mgmt(hdr->frame_control);
617 case WLAN_CIPHER_SUITE_AES_CMAC:
618 if (!ieee80211_is_mgmt(hdr->frame_control))
623 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
624 !ieee80211_is_deauth(hdr->frame_control)))
627 if (!skip_hw && tx->key &&
628 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
629 info->control.hw_key = &tx->key->conf;
635 static ieee80211_tx_result debug_noinline
636 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
638 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
639 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
640 struct ieee80211_supported_band *sband;
642 struct ieee80211_tx_rate_control txrc;
643 struct ieee80211_sta_rates *ratetbl = NULL;
646 memset(&txrc, 0, sizeof(txrc));
648 sband = tx->local->hw.wiphy->bands[info->band];
650 len = min_t(u32, tx->skb->len + FCS_LEN,
651 tx->local->hw.wiphy->frag_threshold);
653 /* set up the tx rate control struct we give the RC algo */
654 txrc.hw = &tx->local->hw;
656 txrc.bss_conf = &tx->sdata->vif.bss_conf;
658 txrc.reported_rate.idx = -1;
659 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
660 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
661 txrc.max_rate_idx = -1;
663 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
665 if (tx->sdata->rc_has_mcs_mask[info->band])
666 txrc.rate_idx_mcs_mask =
667 tx->sdata->rc_rateidx_mcs_mask[info->band];
669 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
670 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
671 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
673 /* set up RTS protection if desired */
674 if (len > tx->local->hw.wiphy->rts_threshold) {
678 info->control.use_rts = txrc.rts;
679 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
682 * Use short preamble if the BSS can handle it, but not for
683 * management frames unless we know the receiver can handle
684 * that -- the management frame might be to a station that
685 * just wants a probe response.
687 if (tx->sdata->vif.bss_conf.use_short_preamble &&
688 (ieee80211_is_data(hdr->frame_control) ||
689 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
690 txrc.short_preamble = true;
692 info->control.short_preamble = txrc.short_preamble;
695 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
698 * Lets not bother rate control if we're associated and cannot
699 * talk to the sta. This should not happen.
701 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
702 !rate_usable_index_exists(sband, &tx->sta->sta),
703 "%s: Dropped data frame as no usable bitrate found while "
704 "scanning and associated. Target station: "
705 "%pM on %d GHz band\n",
706 tx->sdata->name, hdr->addr1,
711 * If we're associated with the sta at this point we know we can at
712 * least send the frame at the lowest bit rate.
714 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
716 if (tx->sta && !info->control.skip_table)
717 ratetbl = rcu_dereference(tx->sta->sta.rates);
719 if (unlikely(info->control.rates[0].idx < 0)) {
721 struct ieee80211_tx_rate rate = {
722 .idx = ratetbl->rate[0].idx,
723 .flags = ratetbl->rate[0].flags,
724 .count = ratetbl->rate[0].count
727 if (ratetbl->rate[0].idx < 0)
735 tx->rate = info->control.rates[0];
738 if (txrc.reported_rate.idx < 0) {
739 txrc.reported_rate = tx->rate;
740 if (tx->sta && ieee80211_is_data(hdr->frame_control))
741 tx->sta->last_tx_rate = txrc.reported_rate;
743 tx->sta->last_tx_rate = txrc.reported_rate;
748 if (unlikely(!info->control.rates[0].count))
749 info->control.rates[0].count = 1;
751 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
752 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
753 info->control.rates[0].count = 1;
758 static ieee80211_tx_result debug_noinline
759 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
761 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
768 * Packet injection may want to control the sequence
769 * number, if we have no matching interface then we
770 * neither assign one ourselves nor ask the driver to.
772 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
775 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
778 if (ieee80211_hdrlen(hdr->frame_control) < 24)
781 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
785 * Anything but QoS data that has a sequence number field
786 * (is long enough) gets a sequence number from the global
787 * counter. QoS data frames with a multicast destination
788 * also use the global counter (802.11-2012 9.3.2.10).
790 if (!ieee80211_is_data_qos(hdr->frame_control) ||
791 is_multicast_ether_addr(hdr->addr1)) {
792 /* driver should assign sequence number */
793 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
794 /* for pure STA mode without beacons, we can do it */
795 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
796 tx->sdata->sequence_number += 0x10;
801 * This should be true for injected/management frames only, for
802 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
803 * above since they are not QoS-data frames.
808 /* include per-STA, per-TID sequence counter */
810 qc = ieee80211_get_qos_ctl(hdr);
811 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
812 seq = &tx->sta->tid_seq[tid];
814 hdr->seq_ctrl = cpu_to_le16(*seq);
816 /* Increase the sequence number. */
817 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
822 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
823 struct sk_buff *skb, int hdrlen,
826 struct ieee80211_local *local = tx->local;
827 struct ieee80211_tx_info *info;
829 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
830 int pos = hdrlen + per_fragm;
831 int rem = skb->len - hdrlen - per_fragm;
833 if (WARN_ON(rem < 0))
836 /* first fragment was already added to queue by caller */
839 int fraglen = per_fragm;
844 tmp = dev_alloc_skb(local->tx_headroom +
846 IEEE80211_ENCRYPT_HEADROOM +
847 IEEE80211_ENCRYPT_TAILROOM);
851 __skb_queue_tail(&tx->skbs, tmp);
853 skb_reserve(tmp, local->tx_headroom +
854 IEEE80211_ENCRYPT_HEADROOM);
855 /* copy control information */
856 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
858 info = IEEE80211_SKB_CB(tmp);
859 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
860 IEEE80211_TX_CTL_FIRST_FRAGMENT);
863 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
865 skb_copy_queue_mapping(tmp, skb);
866 tmp->priority = skb->priority;
869 /* copy header and data */
870 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
871 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
876 /* adjust first fragment's length */
877 skb->len = hdrlen + per_fragm;
881 static ieee80211_tx_result debug_noinline
882 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
884 struct sk_buff *skb = tx->skb;
885 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
886 struct ieee80211_hdr *hdr = (void *)skb->data;
887 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
891 /* no matter what happens, tx->skb moves to tx->skbs */
892 __skb_queue_tail(&tx->skbs, skb);
895 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
898 if (tx->local->ops->set_frag_threshold)
902 * Warn when submitting a fragmented A-MPDU frame and drop it.
903 * This scenario is handled in ieee80211_tx_prepare but extra
904 * caution taken here as fragmented ampdu may cause Tx stop.
906 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
909 hdrlen = ieee80211_hdrlen(hdr->frame_control);
911 /* internal error, why isn't DONTFRAG set? */
912 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
916 * Now fragment the frame. This will allocate all the fragments and
917 * chain them (using skb as the first fragment) to skb->next.
918 * During transmission, we will remove the successfully transmitted
919 * fragments from this list. When the low-level driver rejects one
920 * of the fragments then we will simply pretend to accept the skb
921 * but store it away as pending.
923 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
926 /* update duration/seq/flags of fragments */
929 skb_queue_walk(&tx->skbs, skb) {
930 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
932 hdr = (void *)skb->data;
933 info = IEEE80211_SKB_CB(skb);
935 if (!skb_queue_is_last(&tx->skbs, skb)) {
936 hdr->frame_control |= morefrags;
938 * No multi-rate retries for fragmented frames, that
939 * would completely throw off the NAV at other STAs.
941 info->control.rates[1].idx = -1;
942 info->control.rates[2].idx = -1;
943 info->control.rates[3].idx = -1;
944 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
945 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
947 hdr->frame_control &= ~morefrags;
949 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
956 static ieee80211_tx_result debug_noinline
957 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
965 skb_queue_walk(&tx->skbs, skb) {
966 ac = skb_get_queue_mapping(skb);
967 tx->sta->tx_fragments++;
968 tx->sta->tx_bytes[ac] += skb->len;
971 tx->sta->tx_packets[ac]++;
976 static ieee80211_tx_result debug_noinline
977 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
982 switch (tx->key->conf.cipher) {
983 case WLAN_CIPHER_SUITE_WEP40:
984 case WLAN_CIPHER_SUITE_WEP104:
985 return ieee80211_crypto_wep_encrypt(tx);
986 case WLAN_CIPHER_SUITE_TKIP:
987 return ieee80211_crypto_tkip_encrypt(tx);
988 case WLAN_CIPHER_SUITE_CCMP:
989 return ieee80211_crypto_ccmp_encrypt(tx);
990 case WLAN_CIPHER_SUITE_AES_CMAC:
991 return ieee80211_crypto_aes_cmac_encrypt(tx);
993 return ieee80211_crypto_hw_encrypt(tx);
999 static ieee80211_tx_result debug_noinline
1000 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1002 struct sk_buff *skb;
1003 struct ieee80211_hdr *hdr;
1007 skb_queue_walk(&tx->skbs, skb) {
1008 hdr = (void *) skb->data;
1009 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1010 break; /* must not overwrite AID */
1011 if (!skb_queue_is_last(&tx->skbs, skb)) {
1012 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1013 next_len = next->len;
1016 group_addr = is_multicast_ether_addr(hdr->addr1);
1019 ieee80211_duration(tx, skb, group_addr, next_len);
1025 /* actual transmit path */
1027 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1028 struct sk_buff *skb,
1029 struct ieee80211_tx_info *info,
1030 struct tid_ampdu_tx *tid_tx,
1033 bool queued = false;
1034 bool reset_agg_timer = false;
1035 struct sk_buff *purge_skb = NULL;
1037 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1038 info->flags |= IEEE80211_TX_CTL_AMPDU;
1039 reset_agg_timer = true;
1040 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1042 * nothing -- this aggregation session is being started
1043 * but that might still fail with the driver
1046 spin_lock(&tx->sta->lock);
1048 * Need to re-check now, because we may get here
1050 * 1) in the window during which the setup is actually
1051 * already done, but not marked yet because not all
1052 * packets are spliced over to the driver pending
1053 * queue yet -- if this happened we acquire the lock
1054 * either before or after the splice happens, but
1055 * need to recheck which of these cases happened.
1057 * 2) during session teardown, if the OPERATIONAL bit
1058 * was cleared due to the teardown but the pointer
1059 * hasn't been assigned NULL yet (or we loaded it
1060 * before it was assigned) -- in this case it may
1061 * now be NULL which means we should just let the
1062 * packet pass through because splicing the frames
1063 * back is already done.
1065 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1068 /* do nothing, let packet pass through */
1069 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1070 info->flags |= IEEE80211_TX_CTL_AMPDU;
1071 reset_agg_timer = true;
1074 info->control.vif = &tx->sdata->vif;
1075 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1076 __skb_queue_tail(&tid_tx->pending, skb);
1077 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1078 purge_skb = __skb_dequeue(&tid_tx->pending);
1080 spin_unlock(&tx->sta->lock);
1083 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1086 /* reset session timer */
1087 if (reset_agg_timer && tid_tx->timeout)
1088 tid_tx->last_tx = jiffies;
1096 static ieee80211_tx_result
1097 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_tx_data *tx,
1099 struct sk_buff *skb)
1101 struct ieee80211_local *local = sdata->local;
1102 struct ieee80211_hdr *hdr;
1103 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1107 memset(tx, 0, sizeof(*tx));
1111 __skb_queue_head_init(&tx->skbs);
1114 * If this flag is set to true anywhere, and we get here,
1115 * we are doing the needed processing, so remove the flag
1118 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1120 hdr = (struct ieee80211_hdr *) skb->data;
1122 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1123 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1124 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1126 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1127 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1128 tx->sdata->control_port_protocol == tx->skb->protocol) {
1129 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1132 tx->sta = sta_info_get(sdata, hdr->addr1);
1134 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1135 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1136 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1137 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1138 struct tid_ampdu_tx *tid_tx;
1140 qc = ieee80211_get_qos_ctl(hdr);
1141 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1143 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1147 queued = ieee80211_tx_prep_agg(tx, skb, info,
1150 if (unlikely(queued))
1155 if (is_multicast_ether_addr(hdr->addr1)) {
1156 tx->flags &= ~IEEE80211_TX_UNICAST;
1157 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1159 tx->flags |= IEEE80211_TX_UNICAST;
1161 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1162 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1163 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1164 info->flags & IEEE80211_TX_CTL_AMPDU)
1165 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1169 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1170 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1171 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1173 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1178 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1179 struct ieee80211_vif *vif,
1180 struct ieee80211_sta *sta,
1181 struct sk_buff_head *skbs,
1184 struct ieee80211_tx_control control;
1185 struct sk_buff *skb, *tmp;
1186 unsigned long flags;
1188 skb_queue_walk_safe(skbs, skb, tmp) {
1189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1190 int q = info->hw_queue;
1192 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1193 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1194 __skb_unlink(skb, skbs);
1195 ieee80211_free_txskb(&local->hw, skb);
1200 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1201 if (local->queue_stop_reasons[q] ||
1202 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1203 if (unlikely(info->flags &
1204 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1205 if (local->queue_stop_reasons[q] &
1206 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1208 * Drop off-channel frames if queues
1209 * are stopped for any reason other
1210 * than off-channel operation. Never
1213 spin_unlock_irqrestore(
1214 &local->queue_stop_reason_lock,
1216 ieee80211_purge_tx_queue(&local->hw,
1223 * Since queue is stopped, queue up frames for
1224 * later transmission from the tx-pending
1225 * tasklet when the queue is woken again.
1228 skb_queue_splice_init(skbs,
1229 &local->pending[q]);
1231 skb_queue_splice_tail_init(skbs,
1232 &local->pending[q]);
1234 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1241 info->control.vif = vif;
1244 __skb_unlink(skb, skbs);
1245 drv_tx(local, &control, skb);
1252 * Returns false if the frame couldn't be transmitted but was queued instead.
1254 static bool __ieee80211_tx(struct ieee80211_local *local,
1255 struct sk_buff_head *skbs, int led_len,
1256 struct sta_info *sta, bool txpending)
1258 struct ieee80211_tx_info *info;
1259 struct ieee80211_sub_if_data *sdata;
1260 struct ieee80211_vif *vif;
1261 struct ieee80211_sta *pubsta;
1262 struct sk_buff *skb;
1266 if (WARN_ON(skb_queue_empty(skbs)))
1269 skb = skb_peek(skbs);
1270 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1271 info = IEEE80211_SKB_CB(skb);
1272 sdata = vif_to_sdata(info->control.vif);
1273 if (sta && !sta->uploaded)
1281 switch (sdata->vif.type) {
1282 case NL80211_IFTYPE_MONITOR:
1283 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1287 sdata = rcu_dereference(local->monitor_sdata);
1291 vif->hw_queue[skb_get_queue_mapping(skb)];
1292 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1298 case NL80211_IFTYPE_AP_VLAN:
1299 sdata = container_of(sdata->bss,
1300 struct ieee80211_sub_if_data, u.ap);
1307 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1310 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1312 WARN_ON_ONCE(!skb_queue_empty(skbs));
1318 * Invoke TX handlers, return 0 on success and non-zero if the
1319 * frame was dropped or queued.
1321 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1323 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1324 ieee80211_tx_result res = TX_DROP;
1326 #define CALL_TXH(txh) \
1329 if (res != TX_CONTINUE) \
1333 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1334 CALL_TXH(ieee80211_tx_h_check_assoc);
1335 CALL_TXH(ieee80211_tx_h_ps_buf);
1336 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1337 CALL_TXH(ieee80211_tx_h_select_key);
1338 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1339 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1341 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1342 __skb_queue_tail(&tx->skbs, tx->skb);
1347 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1348 CALL_TXH(ieee80211_tx_h_sequence);
1349 CALL_TXH(ieee80211_tx_h_fragment);
1350 /* handlers after fragment must be aware of tx info fragmentation! */
1351 CALL_TXH(ieee80211_tx_h_stats);
1352 CALL_TXH(ieee80211_tx_h_encrypt);
1353 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1354 CALL_TXH(ieee80211_tx_h_calculate_duration);
1358 if (unlikely(res == TX_DROP)) {
1359 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1361 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1363 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1365 } else if (unlikely(res == TX_QUEUED)) {
1366 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1373 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1374 struct ieee80211_vif *vif, struct sk_buff *skb,
1375 int band, struct ieee80211_sta **sta)
1377 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1379 struct ieee80211_tx_data tx;
1381 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
1385 info->control.vif = vif;
1386 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1388 if (invoke_tx_handlers(&tx))
1393 *sta = &tx.sta->sta;
1400 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1403 * Returns false if the frame couldn't be transmitted but was queued instead.
1405 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1406 struct sk_buff *skb, bool txpending,
1407 enum ieee80211_band band)
1409 struct ieee80211_local *local = sdata->local;
1410 struct ieee80211_tx_data tx;
1411 ieee80211_tx_result res_prepare;
1412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1416 if (unlikely(skb->len < 10)) {
1421 /* initialises tx */
1423 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1425 if (unlikely(res_prepare == TX_DROP)) {
1426 ieee80211_free_txskb(&local->hw, skb);
1428 } else if (unlikely(res_prepare == TX_QUEUED)) {
1434 /* set up hw_queue value early */
1435 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1436 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1438 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1440 if (!invoke_tx_handlers(&tx))
1441 result = __ieee80211_tx(local, &tx.skbs, led_len,
1447 /* device xmit handlers */
1449 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1450 struct sk_buff *skb,
1451 int head_need, bool may_encrypt)
1453 struct ieee80211_local *local = sdata->local;
1456 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1457 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1458 tail_need -= skb_tailroom(skb);
1459 tail_need = max_t(int, tail_need, 0);
1462 if (skb_cloned(skb))
1463 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1464 else if (head_need || tail_need)
1465 I802_DEBUG_INC(local->tx_expand_skb_head);
1469 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1470 wiphy_debug(local->hw.wiphy,
1471 "failed to reallocate TX buffer\n");
1478 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1479 enum ieee80211_band band)
1481 struct ieee80211_local *local = sdata->local;
1482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1487 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1489 headroom = local->tx_headroom;
1491 headroom += IEEE80211_ENCRYPT_HEADROOM;
1492 headroom -= skb_headroom(skb);
1493 headroom = max_t(int, 0, headroom);
1495 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1496 ieee80211_free_txskb(&local->hw, skb);
1500 hdr = (struct ieee80211_hdr *) skb->data;
1501 info->control.vif = &sdata->vif;
1503 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1504 if (ieee80211_is_data(hdr->frame_control) &&
1505 is_unicast_ether_addr(hdr->addr1)) {
1506 if (mesh_nexthop_resolve(sdata, skb))
1507 return; /* skb queued: don't free */
1509 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1513 ieee80211_set_qos_hdr(sdata, skb);
1514 ieee80211_tx(sdata, skb, false, band);
1517 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1519 struct ieee80211_radiotap_iterator iterator;
1520 struct ieee80211_radiotap_header *rthdr =
1521 (struct ieee80211_radiotap_header *) skb->data;
1522 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1523 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1528 IEEE80211_TX_CTL_DONTFRAG;
1531 * for every radiotap entry that is present
1532 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1533 * entries present, or -EINVAL on error)
1537 ret = ieee80211_radiotap_iterator_next(&iterator);
1542 /* see if this argument is something we can use */
1543 switch (iterator.this_arg_index) {
1545 * You must take care when dereferencing iterator.this_arg
1546 * for multibyte types... the pointer is not aligned. Use
1547 * get_unaligned((type *)iterator.this_arg) to dereference
1548 * iterator.this_arg for type "type" safely on all arches.
1550 case IEEE80211_RADIOTAP_FLAGS:
1551 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1553 * this indicates that the skb we have been
1554 * handed has the 32-bit FCS CRC at the end...
1555 * we should react to that by snipping it off
1556 * because it will be recomputed and added
1559 if (skb->len < (iterator._max_length + FCS_LEN))
1562 skb_trim(skb, skb->len - FCS_LEN);
1564 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1565 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1566 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1567 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1570 case IEEE80211_RADIOTAP_TX_FLAGS:
1571 txflags = get_unaligned_le16(iterator.this_arg);
1572 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1573 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1577 * Please update the file
1578 * Documentation/networking/mac80211-injection.txt
1579 * when parsing new fields here.
1587 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1591 * remove the radiotap header
1592 * iterator->_max_length was sanity-checked against
1593 * skb->len by iterator init
1595 skb_pull(skb, iterator._max_length);
1600 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1601 struct net_device *dev)
1603 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1604 struct ieee80211_chanctx_conf *chanctx_conf;
1605 struct ieee80211_channel *chan;
1606 struct ieee80211_radiotap_header *prthdr =
1607 (struct ieee80211_radiotap_header *)skb->data;
1608 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1609 struct ieee80211_hdr *hdr;
1610 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1614 /* check for not even having the fixed radiotap header part */
1615 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1616 goto fail; /* too short to be possibly valid */
1618 /* is it a header version we can trust to find length from? */
1619 if (unlikely(prthdr->it_version))
1620 goto fail; /* only version 0 is supported */
1622 /* then there must be a radiotap header with a length we can use */
1623 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1625 /* does the skb contain enough to deliver on the alleged length? */
1626 if (unlikely(skb->len < len_rthdr))
1627 goto fail; /* skb too short for claimed rt header extent */
1630 * fix up the pointers accounting for the radiotap
1631 * header still being in there. We are being given
1632 * a precooked IEEE80211 header so no need for
1635 skb_set_mac_header(skb, len_rthdr);
1637 * these are just fixed to the end of the rt area since we
1638 * don't have any better information and at this point, nobody cares
1640 skb_set_network_header(skb, len_rthdr);
1641 skb_set_transport_header(skb, len_rthdr);
1643 if (skb->len < len_rthdr + 2)
1646 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1647 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1649 if (skb->len < len_rthdr + hdrlen)
1653 * Initialize skb->protocol if the injected frame is a data frame
1654 * carrying a rfc1042 header
1656 if (ieee80211_is_data(hdr->frame_control) &&
1657 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1658 u8 *payload = (u8 *)hdr + hdrlen;
1660 if (ether_addr_equal(payload, rfc1042_header))
1661 skb->protocol = cpu_to_be16((payload[6] << 8) |
1665 memset(info, 0, sizeof(*info));
1667 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1668 IEEE80211_TX_CTL_INJECTED;
1670 /* process and remove the injection radiotap header */
1671 if (!ieee80211_parse_tx_radiotap(skb))
1677 * We process outgoing injected frames that have a local address
1678 * we handle as though they are non-injected frames.
1679 * This code here isn't entirely correct, the local MAC address
1680 * isn't always enough to find the interface to use; for proper
1681 * VLAN/WDS support we will need a different mechanism (which
1682 * likely isn't going to be monitor interfaces).
1684 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1686 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1687 if (!ieee80211_sdata_running(tmp_sdata))
1689 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1690 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1691 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1693 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1699 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1700 if (!chanctx_conf) {
1701 tmp_sdata = rcu_dereference(local->monitor_sdata);
1704 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1708 chan = chanctx_conf->def.chan;
1709 else if (!local->use_chanctx)
1710 chan = local->_oper_chandef.chan;
1715 * Frame injection is not allowed if beaconing is not allowed
1716 * or if we need radar detection. Beaconing is usually not allowed when
1717 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1718 * Passive scan is also used in world regulatory domains where
1719 * your country is not known and as such it should be treated as
1720 * NO TX unless the channel is explicitly allowed in which case
1721 * your current regulatory domain would not have the passive scan
1724 * Since AP mode uses monitor interfaces to inject/TX management
1725 * frames we can make AP mode the exception to this rule once it
1726 * supports radar detection as its implementation can deal with
1727 * radar detection by itself. We can do that later by adding a
1728 * monitor flag interfaces used for AP support.
1730 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1731 IEEE80211_CHAN_PASSIVE_SCAN)))
1734 ieee80211_xmit(sdata, skb, chan->band);
1737 return NETDEV_TX_OK;
1743 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1747 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1748 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1749 * @skb: packet to be sent
1750 * @dev: incoming interface
1752 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1753 * not be freed, and caller is responsible for either retrying later or freeing
1756 * This function takes in an Ethernet header and encapsulates it with suitable
1757 * IEEE 802.11 header based on which interface the packet is coming in. The
1758 * encapsulated packet will then be passed to master interface, wlan#.11, for
1759 * transmission (through low-level driver).
1761 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1762 struct net_device *dev)
1764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1765 struct ieee80211_local *local = sdata->local;
1766 struct ieee80211_tx_info *info;
1768 u16 ethertype, hdrlen, meshhdrlen = 0;
1770 struct ieee80211_hdr hdr;
1771 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1772 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1773 const u8 *encaps_data;
1774 int encaps_len, skip_header_bytes;
1776 struct sta_info *sta = NULL;
1777 bool wme_sta = false, authorized = false, tdls_auth = false;
1778 bool tdls_direct = false;
1782 struct ieee80211_chanctx_conf *chanctx_conf;
1783 struct ieee80211_sub_if_data *ap_sdata;
1784 enum ieee80211_band band;
1786 if (unlikely(skb->len < ETH_HLEN))
1789 /* convert Ethernet header to proper 802.11 header (based on
1790 * operation mode) */
1791 ethertype = (skb->data[12] << 8) | skb->data[13];
1792 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1796 switch (sdata->vif.type) {
1797 case NL80211_IFTYPE_AP_VLAN:
1798 sta = rcu_dereference(sdata->u.vlan.sta);
1800 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1802 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1803 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1804 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1805 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1807 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1808 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1810 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1812 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1815 band = chanctx_conf->def.chan->band;
1819 case NL80211_IFTYPE_AP:
1820 if (sdata->vif.type == NL80211_IFTYPE_AP)
1821 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1824 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1826 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1827 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1828 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1830 band = chanctx_conf->def.chan->band;
1832 case NL80211_IFTYPE_WDS:
1833 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1835 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1836 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1837 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1838 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1841 * This is the exception! WDS style interfaces are prohibited
1842 * when channel contexts are in used so this must be valid
1844 band = local->hw.conf.chandef.chan->band;
1846 #ifdef CONFIG_MAC80211_MESH
1847 case NL80211_IFTYPE_MESH_POINT:
1848 if (!is_multicast_ether_addr(skb->data)) {
1849 struct sta_info *next_hop;
1850 bool mpp_lookup = true;
1852 mpath = mesh_path_lookup(sdata, skb->data);
1855 next_hop = rcu_dereference(mpath->next_hop);
1857 !(mpath->flags & (MESH_PATH_ACTIVE |
1858 MESH_PATH_RESOLVING)))
1863 mppath = mpp_path_lookup(sdata, skb->data);
1865 if (mppath && mpath)
1866 mesh_path_del(mpath->sdata, mpath->dst);
1870 * Use address extension if it is a packet from
1871 * another interface or if we know the destination
1872 * is being proxied by a portal (i.e. portal address
1873 * differs from proxied address)
1875 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1876 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1877 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1878 skb->data, skb->data + ETH_ALEN);
1879 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1882 /* DS -> MBSS (802.11-2012 13.11.3.3).
1883 * For unicast with unknown forwarding information,
1884 * destination might be in the MBSS or if that fails
1885 * forwarded to another mesh gate. In either case
1886 * resolution will be handled in ieee80211_xmit(), so
1887 * leave the original DA. This also works for mcast */
1888 const u8 *mesh_da = skb->data;
1891 mesh_da = mppath->mpp;
1893 mesh_da = mpath->dst;
1895 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1896 mesh_da, sdata->vif.addr);
1897 if (is_multicast_ether_addr(mesh_da))
1898 /* DA TA mSA AE:SA */
1899 meshhdrlen = ieee80211_new_mesh_header(
1901 skb->data + ETH_ALEN, NULL);
1903 /* RA TA mDA mSA AE:DA SA */
1904 meshhdrlen = ieee80211_new_mesh_header(
1905 sdata, &mesh_hdr, skb->data,
1906 skb->data + ETH_ALEN);
1909 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1912 band = chanctx_conf->def.chan->band;
1915 case NL80211_IFTYPE_STATION:
1916 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1917 bool tdls_peer = false;
1919 sta = sta_info_get(sdata, skb->data);
1921 authorized = test_sta_flag(sta,
1922 WLAN_STA_AUTHORIZED);
1923 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1924 tdls_peer = test_sta_flag(sta,
1925 WLAN_STA_TDLS_PEER);
1926 tdls_auth = test_sta_flag(sta,
1927 WLAN_STA_TDLS_PEER_AUTH);
1931 * If the TDLS link is enabled, send everything
1932 * directly. Otherwise, allow TDLS setup frames
1933 * to be transmitted indirectly.
1935 tdls_direct = tdls_peer && (tdls_auth ||
1936 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1937 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1941 /* link during setup - throw out frames to peer */
1946 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1947 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1948 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1950 } else if (sdata->u.mgd.use_4addr &&
1951 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1952 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1953 IEEE80211_FCTL_TODS);
1955 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1956 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1957 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1958 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1961 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1963 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1964 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1965 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1968 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1971 band = chanctx_conf->def.chan->band;
1973 case NL80211_IFTYPE_ADHOC:
1975 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1976 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1977 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1979 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1982 band = chanctx_conf->def.chan->band;
1989 * There's no need to try to look up the destination
1990 * if it is a multicast address (which can only happen
1993 multicast = is_multicast_ether_addr(hdr.addr1);
1995 sta = sta_info_get(sdata, hdr.addr1);
1997 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1998 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
2002 /* For mesh, the use of the QoS header is mandatory */
2003 if (ieee80211_vif_is_mesh(&sdata->vif))
2006 /* receiver and we are QoS enabled, use a QoS type frame */
2007 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2008 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2013 * Drop unicast frames to unauthorised stations unless they are
2014 * EAPOL frames from the local station.
2016 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2017 !multicast && !authorized &&
2018 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2019 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2020 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2021 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2022 dev->name, hdr.addr1);
2025 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2030 if (unlikely(!multicast && skb->sk &&
2031 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2032 struct sk_buff *orig_skb = skb;
2034 skb = skb_clone(skb, GFP_ATOMIC);
2036 unsigned long flags;
2039 spin_lock_irqsave(&local->ack_status_lock, flags);
2040 id = idr_alloc(&local->ack_status_frames, orig_skb,
2041 1, 0x10000, GFP_ATOMIC);
2042 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2046 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2047 } else if (skb_shared(skb)) {
2048 kfree_skb(orig_skb);
2054 /* couldn't clone -- lose tx status ... */
2060 * If the skb is shared we need to obtain our own copy.
2062 if (skb_shared(skb)) {
2063 struct sk_buff *tmp_skb = skb;
2065 /* can't happen -- skb is a clone if info_id != 0 */
2068 skb = skb_clone(skb, GFP_ATOMIC);
2075 hdr.frame_control = fc;
2076 hdr.duration_id = 0;
2079 skip_header_bytes = ETH_HLEN;
2080 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2081 encaps_data = bridge_tunnel_header;
2082 encaps_len = sizeof(bridge_tunnel_header);
2083 skip_header_bytes -= 2;
2084 } else if (ethertype >= ETH_P_802_3_MIN) {
2085 encaps_data = rfc1042_header;
2086 encaps_len = sizeof(rfc1042_header);
2087 skip_header_bytes -= 2;
2093 nh_pos = skb_network_header(skb) - skb->data;
2094 h_pos = skb_transport_header(skb) - skb->data;
2096 skb_pull(skb, skip_header_bytes);
2097 nh_pos -= skip_header_bytes;
2098 h_pos -= skip_header_bytes;
2100 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2103 * So we need to modify the skb header and hence need a copy of
2104 * that. The head_need variable above doesn't, so far, include
2105 * the needed header space that we don't need right away. If we
2106 * can, then we don't reallocate right now but only after the
2107 * frame arrives at the master device (if it does...)
2109 * If we cannot, however, then we will reallocate to include all
2110 * the ever needed space. Also, if we need to reallocate it anyway,
2111 * make it big enough for everything we may ever need.
2114 if (head_need > 0 || skb_cloned(skb)) {
2115 head_need += IEEE80211_ENCRYPT_HEADROOM;
2116 head_need += local->tx_headroom;
2117 head_need = max_t(int, 0, head_need);
2118 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2119 ieee80211_free_txskb(&local->hw, skb);
2126 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2127 nh_pos += encaps_len;
2128 h_pos += encaps_len;
2131 #ifdef CONFIG_MAC80211_MESH
2132 if (meshhdrlen > 0) {
2133 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2134 nh_pos += meshhdrlen;
2135 h_pos += meshhdrlen;
2139 if (ieee80211_is_data_qos(fc)) {
2140 __le16 *qos_control;
2142 qos_control = (__le16*) skb_push(skb, 2);
2143 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2145 * Maybe we could actually set some fields here, for now just
2146 * initialise to zero to indicate no special operation.
2150 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2155 dev->stats.tx_packets++;
2156 dev->stats.tx_bytes += skb->len;
2158 /* Update skb pointers to various headers since this modified frame
2159 * is going to go through Linux networking code that may potentially
2160 * need things like pointer to IP header. */
2161 skb_set_mac_header(skb, 0);
2162 skb_set_network_header(skb, nh_pos);
2163 skb_set_transport_header(skb, h_pos);
2165 info = IEEE80211_SKB_CB(skb);
2166 memset(info, 0, sizeof(*info));
2168 dev->trans_start = jiffies;
2170 info->flags = info_flags;
2171 info->ack_frame_id = info_id;
2173 ieee80211_xmit(sdata, skb, band);
2176 return NETDEV_TX_OK;
2182 return NETDEV_TX_OK;
2187 * ieee80211_clear_tx_pending may not be called in a context where
2188 * it is possible that it packets could come in again.
2190 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2192 struct sk_buff *skb;
2195 for (i = 0; i < local->hw.queues; i++) {
2196 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2197 ieee80211_free_txskb(&local->hw, skb);
2202 * Returns false if the frame couldn't be transmitted but was queued instead,
2203 * which in this case means re-queued -- take as an indication to stop sending
2204 * more pending frames.
2206 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2207 struct sk_buff *skb)
2209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2210 struct ieee80211_sub_if_data *sdata;
2211 struct sta_info *sta;
2212 struct ieee80211_hdr *hdr;
2214 struct ieee80211_chanctx_conf *chanctx_conf;
2216 sdata = vif_to_sdata(info->control.vif);
2218 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2219 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2220 if (unlikely(!chanctx_conf)) {
2224 result = ieee80211_tx(sdata, skb, true,
2225 chanctx_conf->def.chan->band);
2227 struct sk_buff_head skbs;
2229 __skb_queue_head_init(&skbs);
2230 __skb_queue_tail(&skbs, skb);
2232 hdr = (struct ieee80211_hdr *)skb->data;
2233 sta = sta_info_get(sdata, hdr->addr1);
2235 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2242 * Transmit all pending packets. Called from tasklet.
2244 void ieee80211_tx_pending(unsigned long data)
2246 struct ieee80211_local *local = (struct ieee80211_local *)data;
2247 unsigned long flags;
2253 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2254 for (i = 0; i < local->hw.queues; i++) {
2256 * If queue is stopped by something other than due to pending
2257 * frames, or we have no pending frames, proceed to next queue.
2259 if (local->queue_stop_reasons[i] ||
2260 skb_queue_empty(&local->pending[i]))
2263 while (!skb_queue_empty(&local->pending[i])) {
2264 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2265 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2267 if (WARN_ON(!info->control.vif)) {
2268 ieee80211_free_txskb(&local->hw, skb);
2272 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2275 txok = ieee80211_tx_pending_skb(local, skb);
2276 spin_lock_irqsave(&local->queue_stop_reason_lock,
2282 if (skb_queue_empty(&local->pending[i]))
2283 ieee80211_propagate_queue_wake(local, i);
2285 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2290 /* functions for drivers to get certain frames */
2292 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2293 struct ps_data *ps, struct sk_buff *skb)
2297 int i, have_bits = 0, n1, n2;
2299 /* Generate bitmap for TIM only if there are any STAs in power save
2301 if (atomic_read(&ps->num_sta_ps) > 0)
2302 /* in the hope that this is faster than
2303 * checking byte-for-byte */
2304 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2305 IEEE80211_MAX_AID+1);
2307 if (ps->dtim_count == 0)
2308 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2312 tim = pos = (u8 *) skb_put(skb, 6);
2313 *pos++ = WLAN_EID_TIM;
2315 *pos++ = ps->dtim_count;
2316 *pos++ = sdata->vif.bss_conf.dtim_period;
2318 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2321 ps->dtim_bc_mc = aid0 == 1;
2324 /* Find largest even number N1 so that bits numbered 1 through
2325 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2326 * (N2 + 1) x 8 through 2007 are 0. */
2328 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2335 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2342 /* Bitmap control */
2344 /* Part Virt Bitmap */
2345 skb_put(skb, n2 - n1);
2346 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2348 tim[1] = n2 - n1 + 4;
2350 *pos++ = aid0; /* Bitmap control */
2351 *pos++ = 0; /* Part Virt Bitmap */
2355 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2356 struct ps_data *ps, struct sk_buff *skb)
2358 struct ieee80211_local *local = sdata->local;
2361 * Not very nice, but we want to allow the driver to call
2362 * ieee80211_beacon_get() as a response to the set_tim()
2363 * callback. That, however, is already invoked under the
2364 * sta_lock to guarantee consistent and race-free update
2365 * of the tim bitmap in mac80211 and the driver.
2367 if (local->tim_in_locked_section) {
2368 __ieee80211_beacon_add_tim(sdata, ps, skb);
2370 spin_lock_bh(&local->tim_lock);
2371 __ieee80211_beacon_add_tim(sdata, ps, skb);
2372 spin_unlock_bh(&local->tim_lock);
2378 void ieee80211_csa_finish(struct ieee80211_vif *vif)
2380 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2382 ieee80211_queue_work(&sdata->local->hw,
2383 &sdata->csa_finalize_work);
2385 EXPORT_SYMBOL(ieee80211_csa_finish);
2387 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata,
2388 struct beacon_data *beacon)
2390 struct probe_resp *resp;
2391 int counter_offset_beacon = sdata->csa_counter_offset_beacon;
2392 int counter_offset_presp = sdata->csa_counter_offset_presp;
2394 size_t beacon_data_len;
2396 switch (sdata->vif.type) {
2397 case NL80211_IFTYPE_AP:
2398 beacon_data = beacon->tail;
2399 beacon_data_len = beacon->tail_len;
2401 case NL80211_IFTYPE_ADHOC:
2402 beacon_data = beacon->head;
2403 beacon_data_len = beacon->head_len;
2405 case NL80211_IFTYPE_MESH_POINT:
2406 beacon_data = beacon->head;
2407 beacon_data_len = beacon->head_len;
2412 if (WARN_ON(counter_offset_beacon >= beacon_data_len))
2415 /* warn if the driver did not check for/react to csa completeness */
2416 if (WARN_ON(beacon_data[counter_offset_beacon] == 0))
2419 beacon_data[counter_offset_beacon]--;
2421 if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) {
2423 resp = rcu_dereference(sdata->u.ap.probe_resp);
2425 /* if nl80211 accepted the offset, this should not happen. */
2426 if (WARN_ON(!resp)) {
2430 resp->data[counter_offset_presp]--;
2435 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2437 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2438 struct beacon_data *beacon = NULL;
2440 size_t beacon_data_len;
2441 int counter_beacon = sdata->csa_counter_offset_beacon;
2444 if (!ieee80211_sdata_running(sdata))
2448 if (vif->type == NL80211_IFTYPE_AP) {
2449 struct ieee80211_if_ap *ap = &sdata->u.ap;
2451 beacon = rcu_dereference(ap->beacon);
2452 if (WARN_ON(!beacon || !beacon->tail))
2454 beacon_data = beacon->tail;
2455 beacon_data_len = beacon->tail_len;
2456 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2457 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2459 beacon = rcu_dereference(ifibss->presp);
2463 beacon_data = beacon->head;
2464 beacon_data_len = beacon->head_len;
2465 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2466 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2468 beacon = rcu_dereference(ifmsh->beacon);
2472 beacon_data = beacon->head;
2473 beacon_data_len = beacon->head_len;
2479 if (WARN_ON(counter_beacon > beacon_data_len))
2482 if (beacon_data[counter_beacon] == 0)
2489 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2491 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2492 struct ieee80211_vif *vif,
2493 u16 *tim_offset, u16 *tim_length)
2495 struct ieee80211_local *local = hw_to_local(hw);
2496 struct sk_buff *skb = NULL;
2497 struct ieee80211_tx_info *info;
2498 struct ieee80211_sub_if_data *sdata = NULL;
2499 enum ieee80211_band band;
2500 struct ieee80211_tx_rate_control txrc;
2501 struct ieee80211_chanctx_conf *chanctx_conf;
2505 sdata = vif_to_sdata(vif);
2506 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2508 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2516 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2517 struct ieee80211_if_ap *ap = &sdata->u.ap;
2518 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2521 if (sdata->vif.csa_active)
2522 ieee80211_update_csa(sdata, beacon);
2525 * headroom, head length,
2526 * tail length and maximum TIM length
2528 skb = dev_alloc_skb(local->tx_headroom +
2530 beacon->tail_len + 256);
2534 skb_reserve(skb, local->tx_headroom);
2535 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2538 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2541 *tim_offset = beacon->head_len;
2543 *tim_length = skb->len - beacon->head_len;
2546 memcpy(skb_put(skb, beacon->tail_len),
2547 beacon->tail, beacon->tail_len);
2550 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2551 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2552 struct ieee80211_hdr *hdr;
2553 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2558 if (sdata->vif.csa_active)
2559 ieee80211_update_csa(sdata, presp);
2562 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2565 skb_reserve(skb, local->tx_headroom);
2566 memcpy(skb_put(skb, presp->head_len), presp->head,
2569 hdr = (struct ieee80211_hdr *) skb->data;
2570 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2571 IEEE80211_STYPE_BEACON);
2572 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2573 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2574 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2579 if (sdata->vif.csa_active)
2580 ieee80211_update_csa(sdata, bcn);
2582 if (ifmsh->sync_ops)
2583 ifmsh->sync_ops->adjust_tbtt(
2586 skb = dev_alloc_skb(local->tx_headroom +
2592 skb_reserve(skb, local->tx_headroom);
2593 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2594 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2595 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2601 band = chanctx_conf->def.chan->band;
2603 info = IEEE80211_SKB_CB(skb);
2605 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2606 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2609 memset(&txrc, 0, sizeof(txrc));
2611 txrc.sband = local->hw.wiphy->bands[band];
2612 txrc.bss_conf = &sdata->vif.bss_conf;
2614 txrc.reported_rate.idx = -1;
2615 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2616 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2617 txrc.max_rate_idx = -1;
2619 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2621 rate_control_get_rate(sdata, NULL, &txrc);
2623 info->control.vif = vif;
2625 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2626 IEEE80211_TX_CTL_ASSIGN_SEQ |
2627 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2632 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2634 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2635 struct ieee80211_vif *vif)
2637 struct ieee80211_if_ap *ap = NULL;
2638 struct sk_buff *skb = NULL;
2639 struct probe_resp *presp = NULL;
2640 struct ieee80211_hdr *hdr;
2641 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2643 if (sdata->vif.type != NL80211_IFTYPE_AP)
2649 presp = rcu_dereference(ap->probe_resp);
2653 skb = dev_alloc_skb(presp->len);
2657 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2659 hdr = (struct ieee80211_hdr *) skb->data;
2660 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2666 EXPORT_SYMBOL(ieee80211_proberesp_get);
2668 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2669 struct ieee80211_vif *vif)
2671 struct ieee80211_sub_if_data *sdata;
2672 struct ieee80211_if_managed *ifmgd;
2673 struct ieee80211_pspoll *pspoll;
2674 struct ieee80211_local *local;
2675 struct sk_buff *skb;
2677 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2680 sdata = vif_to_sdata(vif);
2681 ifmgd = &sdata->u.mgd;
2682 local = sdata->local;
2684 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2688 skb_reserve(skb, local->hw.extra_tx_headroom);
2690 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2691 memset(pspoll, 0, sizeof(*pspoll));
2692 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2693 IEEE80211_STYPE_PSPOLL);
2694 pspoll->aid = cpu_to_le16(ifmgd->aid);
2696 /* aid in PS-Poll has its two MSBs each set to 1 */
2697 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2699 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2700 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2704 EXPORT_SYMBOL(ieee80211_pspoll_get);
2706 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2707 struct ieee80211_vif *vif)
2709 struct ieee80211_hdr_3addr *nullfunc;
2710 struct ieee80211_sub_if_data *sdata;
2711 struct ieee80211_if_managed *ifmgd;
2712 struct ieee80211_local *local;
2713 struct sk_buff *skb;
2715 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2718 sdata = vif_to_sdata(vif);
2719 ifmgd = &sdata->u.mgd;
2720 local = sdata->local;
2722 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2726 skb_reserve(skb, local->hw.extra_tx_headroom);
2728 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2730 memset(nullfunc, 0, sizeof(*nullfunc));
2731 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2732 IEEE80211_STYPE_NULLFUNC |
2733 IEEE80211_FCTL_TODS);
2734 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2735 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2736 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2740 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2742 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2743 struct ieee80211_vif *vif,
2744 const u8 *ssid, size_t ssid_len,
2747 struct ieee80211_sub_if_data *sdata;
2748 struct ieee80211_local *local;
2749 struct ieee80211_hdr_3addr *hdr;
2750 struct sk_buff *skb;
2754 sdata = vif_to_sdata(vif);
2755 local = sdata->local;
2756 ie_ssid_len = 2 + ssid_len;
2758 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2759 ie_ssid_len + tailroom);
2763 skb_reserve(skb, local->hw.extra_tx_headroom);
2765 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2766 memset(hdr, 0, sizeof(*hdr));
2767 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2768 IEEE80211_STYPE_PROBE_REQ);
2769 eth_broadcast_addr(hdr->addr1);
2770 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2771 eth_broadcast_addr(hdr->addr3);
2773 pos = skb_put(skb, ie_ssid_len);
2774 *pos++ = WLAN_EID_SSID;
2777 memcpy(pos, ssid, ssid_len);
2782 EXPORT_SYMBOL(ieee80211_probereq_get);
2784 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2785 const void *frame, size_t frame_len,
2786 const struct ieee80211_tx_info *frame_txctl,
2787 struct ieee80211_rts *rts)
2789 const struct ieee80211_hdr *hdr = frame;
2791 rts->frame_control =
2792 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2793 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2795 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2796 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2798 EXPORT_SYMBOL(ieee80211_rts_get);
2800 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2801 const void *frame, size_t frame_len,
2802 const struct ieee80211_tx_info *frame_txctl,
2803 struct ieee80211_cts *cts)
2805 const struct ieee80211_hdr *hdr = frame;
2807 cts->frame_control =
2808 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2809 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2810 frame_len, frame_txctl);
2811 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2813 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2816 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2817 struct ieee80211_vif *vif)
2819 struct ieee80211_local *local = hw_to_local(hw);
2820 struct sk_buff *skb = NULL;
2821 struct ieee80211_tx_data tx;
2822 struct ieee80211_sub_if_data *sdata;
2824 struct ieee80211_tx_info *info;
2825 struct ieee80211_chanctx_conf *chanctx_conf;
2827 sdata = vif_to_sdata(vif);
2830 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2835 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2836 struct beacon_data *beacon =
2837 rcu_dereference(sdata->u.ap.beacon);
2839 if (!beacon || !beacon->head)
2842 ps = &sdata->u.ap.ps;
2843 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2844 ps = &sdata->u.mesh.ps;
2849 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2850 goto out; /* send buffered bc/mc only after DTIM beacon */
2853 skb = skb_dequeue(&ps->bc_buf);
2856 local->total_ps_buffered--;
2858 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2859 struct ieee80211_hdr *hdr =
2860 (struct ieee80211_hdr *) skb->data;
2861 /* more buffered multicast/broadcast frames ==> set
2862 * MoreData flag in IEEE 802.11 header to inform PS
2864 hdr->frame_control |=
2865 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2868 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2869 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2870 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2872 dev_kfree_skb_any(skb);
2875 info = IEEE80211_SKB_CB(skb);
2877 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2878 info->band = chanctx_conf->def.chan->band;
2880 if (invoke_tx_handlers(&tx))
2887 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2889 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2890 struct sk_buff *skb, int tid,
2891 enum ieee80211_band band)
2893 int ac = ieee802_1d_to_ac[tid & 7];
2895 skb_set_mac_header(skb, 0);
2896 skb_set_network_header(skb, 0);
2897 skb_set_transport_header(skb, 0);
2899 skb_set_queue_mapping(skb, ac);
2900 skb->priority = tid;
2902 skb->dev = sdata->dev;
2905 * The other path calling ieee80211_xmit is from the tasklet,
2906 * and while we can handle concurrent transmissions locking
2907 * requirements are that we do not come into tx with bhs on.
2910 ieee80211_xmit(sdata, skb, band);