2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
40 struct sk_buff
*skb
, int group_addr
,
43 int rate
, mrate
, erp
, dur
, i
;
44 struct ieee80211_rate
*txrate
;
45 struct ieee80211_local
*local
= tx
->local
;
46 struct ieee80211_supported_band
*sband
;
47 struct ieee80211_hdr
*hdr
;
48 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 /* assume HW handles this */
51 if (tx
->rate
.flags
& IEEE80211_TX_RC_MCS
)
55 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
58 sband
= local
->hw
.wiphy
->bands
[info
->band
];
59 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
61 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr
= (struct ieee80211_hdr
*)skb
->data
;
81 if (ieee80211_is_ctl(hdr
->frame_control
)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr
) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate
= sband
->bitrates
[0].bitrate
;
119 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
120 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
122 if (r
->bitrate
> txrate
->bitrate
)
125 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
128 switch (sband
->band
) {
129 case IEEE80211_BAND_2GHZ
: {
131 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
132 flag
= IEEE80211_RATE_MANDATORY_G
;
134 flag
= IEEE80211_RATE_MANDATORY_B
;
139 case IEEE80211_BAND_5GHZ
:
140 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
143 case IEEE80211_BAND_60GHZ
:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
158 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
165 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur
*= 2; /* ACK + SIFS */
172 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
173 txrate
->bitrate
, erp
,
174 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
177 return cpu_to_le16(dur
);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
184 struct ieee80211_local
*local
= tx
->local
;
185 struct ieee80211_if_managed
*ifmgd
;
187 /* driver doesn't support power save */
188 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
191 /* hardware does dynamic power save */
192 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
195 /* dynamic power save disabled */
196 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
199 /* we are scanning, don't enable power save */
203 if (!local
->ps_sdata
)
206 /* No point if we're going to suspend */
207 if (local
->quiescing
)
210 /* dynamic ps is supported only in managed mode */
211 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
214 ifmgd
= &tx
->sdata
->u
.mgd
;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
230 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
231 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
234 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
235 ieee80211_stop_queues_by_reason(&local
->hw
,
236 IEEE80211_MAX_QUEUE_MAP
,
237 IEEE80211_QUEUE_STOP_REASON_PS
);
238 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
239 ieee80211_queue_work(&local
->hw
,
240 &local
->dynamic_ps_disable_work
);
243 /* Don't restart the timer if we're not disassociated */
244 if (!ifmgd
->associated
)
247 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
248 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
253 static ieee80211_tx_result debug_noinline
254 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
257 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
258 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
261 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
264 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
265 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
266 !ieee80211_is_probe_req(hdr
->frame_control
) &&
267 !ieee80211_is_nullfunc(hdr
->frame_control
))
269 * When software scanning only nullfunc frames (to notify
270 * the sleep state to the AP) and probe requests (for the
271 * active scan) are allowed, all other frames should not be
272 * sent and we should not get here, but if we do
273 * nonetheless, drop them to avoid sending them
274 * off-channel. See the link below and
275 * ieee80211_start_scan() for more.
277 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
281 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
284 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
287 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
291 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
293 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
294 if (unlikely(!assoc
&&
295 ieee80211_is_data(hdr
->frame_control
))) {
296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
297 sdata_info(tx
->sdata
,
298 "dropped data frame to not associated station %pM\n",
301 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
304 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
305 ieee80211_is_data(hdr
->frame_control
) &&
306 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
308 * No associated STAs - no need to send multicast
317 /* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
323 int total
= 0, purged
= 0;
325 struct ieee80211_sub_if_data
*sdata
;
326 struct sta_info
*sta
;
328 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
331 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
332 ps
= &sdata
->u
.ap
.ps
;
333 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
334 ps
= &sdata
->u
.mesh
.ps
;
338 skb
= skb_dequeue(&ps
->bc_buf
);
343 total
+= skb_queue_len(&ps
->bc_buf
);
347 * Drop one frame from each station from the lowest-priority
348 * AC that has frames at all.
350 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
353 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
354 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
355 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
358 ieee80211_free_txskb(&local
->hw
, skb
);
364 local
->total_ps_buffered
= total
;
365 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
368 static ieee80211_tx_result
369 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
371 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
372 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
376 * broadcast/multicast frame
378 * If any of the associated/peer stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs currently only in AP/VLAN/mesh mode */
384 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
385 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
389 ps
= &tx
->sdata
->bss
->ps
;
390 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
391 ps
= &tx
->sdata
->u
.mesh
.ps
;
397 /* no buffering for ordered frames */
398 if (ieee80211_has_order(hdr
->frame_control
))
401 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
402 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
404 /* no stations in PS mode */
405 if (!atomic_read(&ps
->num_sta_ps
))
408 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
410 /* device releases frame after DTIM beacon */
411 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
414 /* buffered in mac80211 */
415 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
416 purge_old_ps_buffers(tx
->local
);
418 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
420 "BC TX buffer full - dropping the oldest frame\n");
421 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
423 tx
->local
->total_ps_buffered
++;
425 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
430 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
433 if (!ieee80211_is_mgmt(fc
))
436 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
439 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
446 static ieee80211_tx_result
447 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
449 struct sta_info
*sta
= tx
->sta
;
450 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
451 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
452 struct ieee80211_local
*local
= tx
->local
;
457 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
458 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
459 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
460 int ac
= skb_get_queue_mapping(tx
->skb
);
462 /* only deauth, disassoc and action are bufferable MMPDUs */
463 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
464 !ieee80211_is_deauth(hdr
->frame_control
) &&
465 !ieee80211_is_disassoc(hdr
->frame_control
) &&
466 !ieee80211_is_action(hdr
->frame_control
)) {
467 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
471 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
472 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
473 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
474 purge_old_ps_buffers(tx
->local
);
475 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
476 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
478 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
480 ieee80211_free_txskb(&local
->hw
, old
);
482 tx
->local
->total_ps_buffered
++;
484 info
->control
.jiffies
= jiffies
;
485 info
->control
.vif
= &tx
->sdata
->vif
;
486 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
487 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
489 if (!timer_pending(&local
->sta_cleanup
))
490 mod_timer(&local
->sta_cleanup
,
491 round_jiffies(jiffies
+
492 STA_INFO_CLEANUP_INTERVAL
));
495 * We queued up some frames, so the TIM bit might
496 * need to be set, recalculate it.
498 sta_info_recalc_tim(sta
);
501 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
503 "STA %pM in PS mode, but polling/in SP -> send frame\n",
510 static ieee80211_tx_result debug_noinline
511 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
513 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
516 if (tx
->flags
& IEEE80211_TX_UNICAST
)
517 return ieee80211_tx_h_unicast_ps_buf(tx
);
519 return ieee80211_tx_h_multicast_ps_buf(tx
);
522 static ieee80211_tx_result debug_noinline
523 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
525 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
527 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
528 tx
->sdata
->control_port_no_encrypt
))
529 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
534 static ieee80211_tx_result debug_noinline
535 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
537 struct ieee80211_key
*key
;
538 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
539 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
541 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
543 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
545 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
546 is_multicast_ether_addr(hdr
->addr1
) &&
547 ieee80211_is_robust_mgmt_frame(hdr
) &&
548 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
550 else if (is_multicast_ether_addr(hdr
->addr1
) &&
551 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
553 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
554 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
556 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
558 else if (!tx
->sdata
->drop_unencrypted
)
560 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
562 else if (ieee80211_is_robust_mgmt_frame(hdr
) &&
563 !(ieee80211_is_action(hdr
->frame_control
) &&
564 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
566 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
567 !ieee80211_is_robust_mgmt_frame(hdr
))
570 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
575 bool skip_hw
= false;
577 tx
->key
->tx_rx_count
++;
578 /* TODO: add threshold stuff again */
580 switch (tx
->key
->conf
.cipher
) {
581 case WLAN_CIPHER_SUITE_WEP40
:
582 case WLAN_CIPHER_SUITE_WEP104
:
583 case WLAN_CIPHER_SUITE_TKIP
:
584 if (!ieee80211_is_data_present(hdr
->frame_control
))
587 case WLAN_CIPHER_SUITE_CCMP
:
588 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
589 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
593 skip_hw
= (tx
->key
->conf
.flags
&
594 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
595 ieee80211_is_mgmt(hdr
->frame_control
);
597 case WLAN_CIPHER_SUITE_AES_CMAC
:
598 if (!ieee80211_is_mgmt(hdr
->frame_control
))
603 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
604 !ieee80211_is_deauth(hdr
->frame_control
)))
607 if (!skip_hw
&& tx
->key
&&
608 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
609 info
->control
.hw_key
= &tx
->key
->conf
;
615 static ieee80211_tx_result debug_noinline
616 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
618 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
619 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
620 struct ieee80211_supported_band
*sband
;
622 struct ieee80211_tx_rate_control txrc
;
623 struct ieee80211_sta_rates
*ratetbl
= NULL
;
626 memset(&txrc
, 0, sizeof(txrc
));
628 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
630 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
631 tx
->local
->hw
.wiphy
->frag_threshold
);
633 /* set up the tx rate control struct we give the RC algo */
634 txrc
.hw
= &tx
->local
->hw
;
636 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
638 txrc
.reported_rate
.idx
= -1;
639 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
640 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
641 txrc
.max_rate_idx
= -1;
643 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
645 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
646 txrc
.rate_idx_mcs_mask
=
647 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
649 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
650 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
651 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
653 /* set up RTS protection if desired */
654 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
658 info
->control
.use_rts
= txrc
.rts
;
659 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
662 * Use short preamble if the BSS can handle it, but not for
663 * management frames unless we know the receiver can handle
664 * that -- the management frame might be to a station that
665 * just wants a probe response.
667 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
668 (ieee80211_is_data(hdr
->frame_control
) ||
669 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
670 txrc
.short_preamble
= true;
672 info
->control
.short_preamble
= txrc
.short_preamble
;
675 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
678 * Lets not bother rate control if we're associated and cannot
679 * talk to the sta. This should not happen.
681 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
682 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
683 "%s: Dropped data frame as no usable bitrate found while "
684 "scanning and associated. Target station: "
685 "%pM on %d GHz band\n",
686 tx
->sdata
->name
, hdr
->addr1
,
691 * If we're associated with the sta at this point we know we can at
692 * least send the frame at the lowest bit rate.
694 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
696 if (tx
->sta
&& !info
->control
.skip_table
)
697 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
699 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
701 struct ieee80211_tx_rate rate
= {
702 .idx
= ratetbl
->rate
[0].idx
,
703 .flags
= ratetbl
->rate
[0].flags
,
704 .count
= ratetbl
->rate
[0].count
707 if (ratetbl
->rate
[0].idx
< 0)
715 tx
->rate
= info
->control
.rates
[0];
718 if (txrc
.reported_rate
.idx
< 0) {
719 txrc
.reported_rate
= tx
->rate
;
720 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
721 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
723 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
728 if (unlikely(!info
->control
.rates
[0].count
))
729 info
->control
.rates
[0].count
= 1;
731 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
732 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
733 info
->control
.rates
[0].count
= 1;
738 static ieee80211_tx_result debug_noinline
739 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
741 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
742 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
748 * Packet injection may want to control the sequence
749 * number, if we have no matching interface then we
750 * neither assign one ourselves nor ask the driver to.
752 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
755 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
758 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
761 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
765 * Anything but QoS data that has a sequence number field
766 * (is long enough) gets a sequence number from the global
769 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
770 /* driver should assign sequence number */
771 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
772 /* for pure STA mode without beacons, we can do it */
773 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
774 tx
->sdata
->sequence_number
+= 0x10;
779 * This should be true for injected/management frames only, for
780 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
781 * above since they are not QoS-data frames.
786 /* include per-STA, per-TID sequence counter */
788 qc
= ieee80211_get_qos_ctl(hdr
);
789 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
790 seq
= &tx
->sta
->tid_seq
[tid
];
792 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
794 /* Increase the sequence number. */
795 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
800 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
801 struct sk_buff
*skb
, int hdrlen
,
804 struct ieee80211_local
*local
= tx
->local
;
805 struct ieee80211_tx_info
*info
;
807 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
808 int pos
= hdrlen
+ per_fragm
;
809 int rem
= skb
->len
- hdrlen
- per_fragm
;
811 if (WARN_ON(rem
< 0))
814 /* first fragment was already added to queue by caller */
817 int fraglen
= per_fragm
;
822 tmp
= dev_alloc_skb(local
->tx_headroom
+
824 IEEE80211_ENCRYPT_HEADROOM
+
825 IEEE80211_ENCRYPT_TAILROOM
);
829 __skb_queue_tail(&tx
->skbs
, tmp
);
831 skb_reserve(tmp
, local
->tx_headroom
+
832 IEEE80211_ENCRYPT_HEADROOM
);
833 /* copy control information */
834 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
836 info
= IEEE80211_SKB_CB(tmp
);
837 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
838 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
841 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
843 skb_copy_queue_mapping(tmp
, skb
);
844 tmp
->priority
= skb
->priority
;
847 /* copy header and data */
848 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
849 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
854 /* adjust first fragment's length */
855 skb
->len
= hdrlen
+ per_fragm
;
859 static ieee80211_tx_result debug_noinline
860 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
862 struct sk_buff
*skb
= tx
->skb
;
863 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
864 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
865 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
869 /* no matter what happens, tx->skb moves to tx->skbs */
870 __skb_queue_tail(&tx
->skbs
, skb
);
873 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
876 if (tx
->local
->ops
->set_frag_threshold
)
880 * Warn when submitting a fragmented A-MPDU frame and drop it.
881 * This scenario is handled in ieee80211_tx_prepare but extra
882 * caution taken here as fragmented ampdu may cause Tx stop.
884 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
887 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
889 /* internal error, why isn't DONTFRAG set? */
890 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
894 * Now fragment the frame. This will allocate all the fragments and
895 * chain them (using skb as the first fragment) to skb->next.
896 * During transmission, we will remove the successfully transmitted
897 * fragments from this list. When the low-level driver rejects one
898 * of the fragments then we will simply pretend to accept the skb
899 * but store it away as pending.
901 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
904 /* update duration/seq/flags of fragments */
907 skb_queue_walk(&tx
->skbs
, skb
) {
908 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
910 hdr
= (void *)skb
->data
;
911 info
= IEEE80211_SKB_CB(skb
);
913 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
914 hdr
->frame_control
|= morefrags
;
916 * No multi-rate retries for fragmented frames, that
917 * would completely throw off the NAV at other STAs.
919 info
->control
.rates
[1].idx
= -1;
920 info
->control
.rates
[2].idx
= -1;
921 info
->control
.rates
[3].idx
= -1;
922 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
923 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
925 hdr
->frame_control
&= ~morefrags
;
927 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
934 static ieee80211_tx_result debug_noinline
935 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
943 skb_queue_walk(&tx
->skbs
, skb
) {
944 ac
= skb_get_queue_mapping(skb
);
945 tx
->sta
->tx_fragments
++;
946 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
949 tx
->sta
->tx_packets
[ac
]++;
954 static ieee80211_tx_result debug_noinline
955 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
960 switch (tx
->key
->conf
.cipher
) {
961 case WLAN_CIPHER_SUITE_WEP40
:
962 case WLAN_CIPHER_SUITE_WEP104
:
963 return ieee80211_crypto_wep_encrypt(tx
);
964 case WLAN_CIPHER_SUITE_TKIP
:
965 return ieee80211_crypto_tkip_encrypt(tx
);
966 case WLAN_CIPHER_SUITE_CCMP
:
967 return ieee80211_crypto_ccmp_encrypt(tx
);
968 case WLAN_CIPHER_SUITE_AES_CMAC
:
969 return ieee80211_crypto_aes_cmac_encrypt(tx
);
971 return ieee80211_crypto_hw_encrypt(tx
);
977 static ieee80211_tx_result debug_noinline
978 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
981 struct ieee80211_hdr
*hdr
;
985 skb_queue_walk(&tx
->skbs
, skb
) {
986 hdr
= (void *) skb
->data
;
987 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
988 break; /* must not overwrite AID */
989 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
990 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
991 next_len
= next
->len
;
994 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
997 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1003 /* actual transmit path */
1005 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1006 struct sk_buff
*skb
,
1007 struct ieee80211_tx_info
*info
,
1008 struct tid_ampdu_tx
*tid_tx
,
1011 bool queued
= false;
1012 bool reset_agg_timer
= false;
1013 struct sk_buff
*purge_skb
= NULL
;
1015 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1016 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1017 reset_agg_timer
= true;
1018 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1020 * nothing -- this aggregation session is being started
1021 * but that might still fail with the driver
1024 spin_lock(&tx
->sta
->lock
);
1026 * Need to re-check now, because we may get here
1028 * 1) in the window during which the setup is actually
1029 * already done, but not marked yet because not all
1030 * packets are spliced over to the driver pending
1031 * queue yet -- if this happened we acquire the lock
1032 * either before or after the splice happens, but
1033 * need to recheck which of these cases happened.
1035 * 2) during session teardown, if the OPERATIONAL bit
1036 * was cleared due to the teardown but the pointer
1037 * hasn't been assigned NULL yet (or we loaded it
1038 * before it was assigned) -- in this case it may
1039 * now be NULL which means we should just let the
1040 * packet pass through because splicing the frames
1041 * back is already done.
1043 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1046 /* do nothing, let packet pass through */
1047 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1048 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1049 reset_agg_timer
= true;
1052 info
->control
.vif
= &tx
->sdata
->vif
;
1053 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1054 __skb_queue_tail(&tid_tx
->pending
, skb
);
1055 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1056 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1058 spin_unlock(&tx
->sta
->lock
);
1061 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1064 /* reset session timer */
1065 if (reset_agg_timer
&& tid_tx
->timeout
)
1066 tid_tx
->last_tx
= jiffies
;
1074 static ieee80211_tx_result
1075 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1076 struct ieee80211_tx_data
*tx
,
1077 struct sk_buff
*skb
)
1079 struct ieee80211_local
*local
= sdata
->local
;
1080 struct ieee80211_hdr
*hdr
;
1081 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1085 memset(tx
, 0, sizeof(*tx
));
1089 __skb_queue_head_init(&tx
->skbs
);
1092 * If this flag is set to true anywhere, and we get here,
1093 * we are doing the needed processing, so remove the flag
1096 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1098 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1100 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1101 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1102 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1104 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1105 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1106 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1109 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1111 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1112 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1113 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1114 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1115 struct tid_ampdu_tx
*tid_tx
;
1117 qc
= ieee80211_get_qos_ctl(hdr
);
1118 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1120 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1124 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1127 if (unlikely(queued
))
1132 if (is_multicast_ether_addr(hdr
->addr1
)) {
1133 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1134 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1136 tx
->flags
|= IEEE80211_TX_UNICAST
;
1138 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1139 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1140 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1141 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1142 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1146 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1147 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1148 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1150 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1155 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1156 struct ieee80211_vif
*vif
,
1157 struct ieee80211_sta
*sta
,
1158 struct sk_buff_head
*skbs
,
1161 struct ieee80211_tx_control control
;
1162 struct sk_buff
*skb
, *tmp
;
1163 unsigned long flags
;
1165 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1166 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1167 int q
= info
->hw_queue
;
1169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1170 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1171 __skb_unlink(skb
, skbs
);
1172 ieee80211_free_txskb(&local
->hw
, skb
);
1177 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1178 if (local
->queue_stop_reasons
[q
] ||
1179 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1180 if (unlikely(info
->flags
&
1181 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1182 if (local
->queue_stop_reasons
[q
] &
1183 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1185 * Drop off-channel frames if queues
1186 * are stopped for any reason other
1187 * than off-channel operation. Never
1190 spin_unlock_irqrestore(
1191 &local
->queue_stop_reason_lock
,
1193 ieee80211_purge_tx_queue(&local
->hw
,
1200 * Since queue is stopped, queue up frames for
1201 * later transmission from the tx-pending
1202 * tasklet when the queue is woken again.
1205 skb_queue_splice_init(skbs
,
1206 &local
->pending
[q
]);
1208 skb_queue_splice_tail_init(skbs
,
1209 &local
->pending
[q
]);
1211 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1216 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1218 info
->control
.vif
= vif
;
1221 __skb_unlink(skb
, skbs
);
1222 drv_tx(local
, &control
, skb
);
1229 * Returns false if the frame couldn't be transmitted but was queued instead.
1231 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1232 struct sk_buff_head
*skbs
, int led_len
,
1233 struct sta_info
*sta
, bool txpending
)
1235 struct ieee80211_tx_info
*info
;
1236 struct ieee80211_sub_if_data
*sdata
;
1237 struct ieee80211_vif
*vif
;
1238 struct ieee80211_sta
*pubsta
;
1239 struct sk_buff
*skb
;
1243 if (WARN_ON(skb_queue_empty(skbs
)))
1246 skb
= skb_peek(skbs
);
1247 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1248 info
= IEEE80211_SKB_CB(skb
);
1249 sdata
= vif_to_sdata(info
->control
.vif
);
1250 if (sta
&& !sta
->uploaded
)
1258 switch (sdata
->vif
.type
) {
1259 case NL80211_IFTYPE_MONITOR
:
1260 sdata
= rcu_dereference(local
->monitor_sdata
);
1264 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1265 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1271 case NL80211_IFTYPE_AP_VLAN
:
1272 sdata
= container_of(sdata
->bss
,
1273 struct ieee80211_sub_if_data
, u
.ap
);
1280 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1283 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1284 ieee80211_led_tx(local
, 1);
1286 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1292 * Invoke TX handlers, return 0 on success and non-zero if the
1293 * frame was dropped or queued.
1295 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1297 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1298 ieee80211_tx_result res
= TX_DROP
;
1300 #define CALL_TXH(txh) \
1303 if (res != TX_CONTINUE) \
1307 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1308 CALL_TXH(ieee80211_tx_h_check_assoc
);
1309 CALL_TXH(ieee80211_tx_h_ps_buf
);
1310 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1311 CALL_TXH(ieee80211_tx_h_select_key
);
1312 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1313 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1315 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1316 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1321 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1322 CALL_TXH(ieee80211_tx_h_sequence
);
1323 CALL_TXH(ieee80211_tx_h_fragment
);
1324 /* handlers after fragment must be aware of tx info fragmentation! */
1325 CALL_TXH(ieee80211_tx_h_stats
);
1326 CALL_TXH(ieee80211_tx_h_encrypt
);
1327 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1328 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1332 if (unlikely(res
== TX_DROP
)) {
1333 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1335 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1337 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1339 } else if (unlikely(res
== TX_QUEUED
)) {
1340 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1348 * Returns false if the frame couldn't be transmitted but was queued instead.
1350 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1351 struct sk_buff
*skb
, bool txpending
,
1352 enum ieee80211_band band
)
1354 struct ieee80211_local
*local
= sdata
->local
;
1355 struct ieee80211_tx_data tx
;
1356 ieee80211_tx_result res_prepare
;
1357 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1361 if (unlikely(skb
->len
< 10)) {
1366 /* initialises tx */
1368 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1370 if (unlikely(res_prepare
== TX_DROP
)) {
1371 ieee80211_free_txskb(&local
->hw
, skb
);
1373 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1379 /* set up hw_queue value early */
1380 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1381 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1383 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1385 if (!invoke_tx_handlers(&tx
))
1386 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1392 /* device xmit handlers */
1394 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1395 struct sk_buff
*skb
,
1396 int head_need
, bool may_encrypt
)
1398 struct ieee80211_local
*local
= sdata
->local
;
1401 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1402 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1403 tail_need
-= skb_tailroom(skb
);
1404 tail_need
= max_t(int, tail_need
, 0);
1407 if (skb_cloned(skb
))
1408 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1409 else if (head_need
|| tail_need
)
1410 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1414 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1415 wiphy_debug(local
->hw
.wiphy
,
1416 "failed to reallocate TX buffer\n");
1423 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
1424 enum ieee80211_band band
)
1426 struct ieee80211_local
*local
= sdata
->local
;
1427 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1428 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1432 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1434 headroom
= local
->tx_headroom
;
1436 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1437 headroom
-= skb_headroom(skb
);
1438 headroom
= max_t(int, 0, headroom
);
1440 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1441 ieee80211_free_txskb(&local
->hw
, skb
);
1445 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1446 info
->control
.vif
= &sdata
->vif
;
1448 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1449 if (ieee80211_is_data(hdr
->frame_control
) &&
1450 is_unicast_ether_addr(hdr
->addr1
)) {
1451 if (mesh_nexthop_resolve(sdata
, skb
))
1452 return; /* skb queued: don't free */
1454 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1458 ieee80211_set_qos_hdr(sdata
, skb
);
1459 ieee80211_tx(sdata
, skb
, false, band
);
1462 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1464 struct ieee80211_radiotap_iterator iterator
;
1465 struct ieee80211_radiotap_header
*rthdr
=
1466 (struct ieee80211_radiotap_header
*) skb
->data
;
1467 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1468 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1472 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1473 IEEE80211_TX_CTL_DONTFRAG
;
1476 * for every radiotap entry that is present
1477 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1478 * entries present, or -EINVAL on error)
1482 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1487 /* see if this argument is something we can use */
1488 switch (iterator
.this_arg_index
) {
1490 * You must take care when dereferencing iterator.this_arg
1491 * for multibyte types... the pointer is not aligned. Use
1492 * get_unaligned((type *)iterator.this_arg) to dereference
1493 * iterator.this_arg for type "type" safely on all arches.
1495 case IEEE80211_RADIOTAP_FLAGS
:
1496 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1498 * this indicates that the skb we have been
1499 * handed has the 32-bit FCS CRC at the end...
1500 * we should react to that by snipping it off
1501 * because it will be recomputed and added
1504 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1507 skb_trim(skb
, skb
->len
- FCS_LEN
);
1509 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1510 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1511 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1512 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1515 case IEEE80211_RADIOTAP_TX_FLAGS
:
1516 txflags
= get_unaligned_le16(iterator
.this_arg
);
1517 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1518 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1522 * Please update the file
1523 * Documentation/networking/mac80211-injection.txt
1524 * when parsing new fields here.
1532 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1536 * remove the radiotap header
1537 * iterator->_max_length was sanity-checked against
1538 * skb->len by iterator init
1540 skb_pull(skb
, iterator
._max_length
);
1545 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1546 struct net_device
*dev
)
1548 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1549 struct ieee80211_chanctx_conf
*chanctx_conf
;
1550 struct ieee80211_channel
*chan
;
1551 struct ieee80211_radiotap_header
*prthdr
=
1552 (struct ieee80211_radiotap_header
*)skb
->data
;
1553 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1554 struct ieee80211_hdr
*hdr
;
1555 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1559 /* check for not even having the fixed radiotap header part */
1560 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1561 goto fail
; /* too short to be possibly valid */
1563 /* is it a header version we can trust to find length from? */
1564 if (unlikely(prthdr
->it_version
))
1565 goto fail
; /* only version 0 is supported */
1567 /* then there must be a radiotap header with a length we can use */
1568 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1570 /* does the skb contain enough to deliver on the alleged length? */
1571 if (unlikely(skb
->len
< len_rthdr
))
1572 goto fail
; /* skb too short for claimed rt header extent */
1575 * fix up the pointers accounting for the radiotap
1576 * header still being in there. We are being given
1577 * a precooked IEEE80211 header so no need for
1580 skb_set_mac_header(skb
, len_rthdr
);
1582 * these are just fixed to the end of the rt area since we
1583 * don't have any better information and at this point, nobody cares
1585 skb_set_network_header(skb
, len_rthdr
);
1586 skb_set_transport_header(skb
, len_rthdr
);
1588 if (skb
->len
< len_rthdr
+ 2)
1591 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1592 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1594 if (skb
->len
< len_rthdr
+ hdrlen
)
1598 * Initialize skb->protocol if the injected frame is a data frame
1599 * carrying a rfc1042 header
1601 if (ieee80211_is_data(hdr
->frame_control
) &&
1602 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1603 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1605 if (ether_addr_equal(payload
, rfc1042_header
))
1606 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1610 memset(info
, 0, sizeof(*info
));
1612 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1613 IEEE80211_TX_CTL_INJECTED
;
1615 /* process and remove the injection radiotap header */
1616 if (!ieee80211_parse_tx_radiotap(skb
))
1622 * We process outgoing injected frames that have a local address
1623 * we handle as though they are non-injected frames.
1624 * This code here isn't entirely correct, the local MAC address
1625 * isn't always enough to find the interface to use; for proper
1626 * VLAN/WDS support we will need a different mechanism (which
1627 * likely isn't going to be monitor interfaces).
1629 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1631 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1632 if (!ieee80211_sdata_running(tmp_sdata
))
1634 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1635 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1636 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1638 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1644 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1645 if (!chanctx_conf
) {
1646 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1649 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1653 chan
= chanctx_conf
->def
.chan
;
1654 else if (!local
->use_chanctx
)
1655 chan
= local
->_oper_chandef
.chan
;
1660 * Frame injection is not allowed if beaconing is not allowed
1661 * or if we need radar detection. Beaconing is usually not allowed when
1662 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1663 * Passive scan is also used in world regulatory domains where
1664 * your country is not known and as such it should be treated as
1665 * NO TX unless the channel is explicitly allowed in which case
1666 * your current regulatory domain would not have the passive scan
1669 * Since AP mode uses monitor interfaces to inject/TX management
1670 * frames we can make AP mode the exception to this rule once it
1671 * supports radar detection as its implementation can deal with
1672 * radar detection by itself. We can do that later by adding a
1673 * monitor flag interfaces used for AP support.
1675 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1676 IEEE80211_CHAN_PASSIVE_SCAN
)))
1679 ieee80211_xmit(sdata
, skb
, chan
->band
);
1682 return NETDEV_TX_OK
;
1688 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1692 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1693 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1694 * @skb: packet to be sent
1695 * @dev: incoming interface
1697 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1698 * not be freed, and caller is responsible for either retrying later or freeing
1701 * This function takes in an Ethernet header and encapsulates it with suitable
1702 * IEEE 802.11 header based on which interface the packet is coming in. The
1703 * encapsulated packet will then be passed to master interface, wlan#.11, for
1704 * transmission (through low-level driver).
1706 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1707 struct net_device
*dev
)
1709 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1710 struct ieee80211_local
*local
= sdata
->local
;
1711 struct ieee80211_tx_info
*info
;
1713 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1715 struct ieee80211_hdr hdr
;
1716 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1717 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1718 const u8
*encaps_data
;
1719 int encaps_len
, skip_header_bytes
;
1721 struct sta_info
*sta
= NULL
;
1722 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1723 bool tdls_direct
= false;
1727 struct ieee80211_chanctx_conf
*chanctx_conf
;
1728 struct ieee80211_sub_if_data
*ap_sdata
;
1729 enum ieee80211_band band
;
1731 if (unlikely(skb
->len
< ETH_HLEN
))
1734 /* convert Ethernet header to proper 802.11 header (based on
1735 * operation mode) */
1736 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1737 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1741 switch (sdata
->vif
.type
) {
1742 case NL80211_IFTYPE_AP_VLAN
:
1743 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1745 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1747 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1748 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1749 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1750 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1752 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1753 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1755 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1757 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1760 band
= chanctx_conf
->def
.chan
->band
;
1764 case NL80211_IFTYPE_AP
:
1765 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1766 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1769 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1771 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1772 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1773 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1775 band
= chanctx_conf
->def
.chan
->band
;
1777 case NL80211_IFTYPE_WDS
:
1778 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1780 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1781 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1782 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1783 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1786 * This is the exception! WDS style interfaces are prohibited
1787 * when channel contexts are in used so this must be valid
1789 band
= local
->hw
.conf
.chandef
.chan
->band
;
1791 #ifdef CONFIG_MAC80211_MESH
1792 case NL80211_IFTYPE_MESH_POINT
:
1793 if (!is_multicast_ether_addr(skb
->data
)) {
1794 struct sta_info
*next_hop
;
1795 bool mpp_lookup
= true;
1797 mpath
= mesh_path_lookup(sdata
, skb
->data
);
1800 next_hop
= rcu_dereference(mpath
->next_hop
);
1802 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
1803 MESH_PATH_RESOLVING
)))
1808 mppath
= mpp_path_lookup(sdata
, skb
->data
);
1810 if (mppath
&& mpath
)
1811 mesh_path_del(mpath
->sdata
, mpath
->dst
);
1815 * Use address extension if it is a packet from
1816 * another interface or if we know the destination
1817 * is being proxied by a portal (i.e. portal address
1818 * differs from proxied address)
1820 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1821 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1822 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1823 skb
->data
, skb
->data
+ ETH_ALEN
);
1824 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
1827 /* DS -> MBSS (802.11-2012 13.11.3.3).
1828 * For unicast with unknown forwarding information,
1829 * destination might be in the MBSS or if that fails
1830 * forwarded to another mesh gate. In either case
1831 * resolution will be handled in ieee80211_xmit(), so
1832 * leave the original DA. This also works for mcast */
1833 const u8
*mesh_da
= skb
->data
;
1836 mesh_da
= mppath
->mpp
;
1838 mesh_da
= mpath
->dst
;
1840 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1841 mesh_da
, sdata
->vif
.addr
);
1842 if (is_multicast_ether_addr(mesh_da
))
1843 /* DA TA mSA AE:SA */
1844 meshhdrlen
= ieee80211_new_mesh_header(
1846 skb
->data
+ ETH_ALEN
, NULL
);
1848 /* RA TA mDA mSA AE:DA SA */
1849 meshhdrlen
= ieee80211_new_mesh_header(
1850 sdata
, &mesh_hdr
, skb
->data
,
1851 skb
->data
+ ETH_ALEN
);
1854 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1857 band
= chanctx_conf
->def
.chan
->band
;
1860 case NL80211_IFTYPE_STATION
:
1861 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1862 bool tdls_peer
= false;
1864 sta
= sta_info_get(sdata
, skb
->data
);
1866 authorized
= test_sta_flag(sta
,
1867 WLAN_STA_AUTHORIZED
);
1868 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1869 tdls_peer
= test_sta_flag(sta
,
1870 WLAN_STA_TDLS_PEER
);
1871 tdls_auth
= test_sta_flag(sta
,
1872 WLAN_STA_TDLS_PEER_AUTH
);
1876 * If the TDLS link is enabled, send everything
1877 * directly. Otherwise, allow TDLS setup frames
1878 * to be transmitted indirectly.
1880 tdls_direct
= tdls_peer
&& (tdls_auth
||
1881 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1882 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1886 /* link during setup - throw out frames to peer */
1891 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1892 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1893 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1895 } else if (sdata
->u
.mgd
.use_4addr
&&
1896 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1897 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1898 IEEE80211_FCTL_TODS
);
1900 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1901 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1902 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1903 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1906 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1908 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1909 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1910 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1913 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1916 band
= chanctx_conf
->def
.chan
->band
;
1918 case NL80211_IFTYPE_ADHOC
:
1920 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1921 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1922 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1924 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1927 band
= chanctx_conf
->def
.chan
->band
;
1934 * There's no need to try to look up the destination
1935 * if it is a multicast address (which can only happen
1938 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1940 sta
= sta_info_get(sdata
, hdr
.addr1
);
1942 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1943 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1947 /* For mesh, the use of the QoS header is mandatory */
1948 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1951 /* receiver and we are QoS enabled, use a QoS type frame */
1952 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1953 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1958 * Drop unicast frames to unauthorised stations unless they are
1959 * EAPOL frames from the local station.
1961 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1962 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1963 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1964 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1966 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1967 dev
->name
, hdr
.addr1
);
1970 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1975 if (unlikely(!multicast
&& skb
->sk
&&
1976 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1977 struct sk_buff
*orig_skb
= skb
;
1979 skb
= skb_clone(skb
, GFP_ATOMIC
);
1981 unsigned long flags
;
1984 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1985 id
= idr_alloc(&local
->ack_status_frames
, orig_skb
,
1986 1, 0x10000, GFP_ATOMIC
);
1987 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1991 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1992 } else if (skb_shared(skb
)) {
1993 kfree_skb(orig_skb
);
1999 /* couldn't clone -- lose tx status ... */
2005 * If the skb is shared we need to obtain our own copy.
2007 if (skb_shared(skb
)) {
2008 struct sk_buff
*tmp_skb
= skb
;
2010 /* can't happen -- skb is a clone if info_id != 0 */
2013 skb
= skb_clone(skb
, GFP_ATOMIC
);
2020 hdr
.frame_control
= fc
;
2021 hdr
.duration_id
= 0;
2024 skip_header_bytes
= ETH_HLEN
;
2025 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2026 encaps_data
= bridge_tunnel_header
;
2027 encaps_len
= sizeof(bridge_tunnel_header
);
2028 skip_header_bytes
-= 2;
2029 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2030 encaps_data
= rfc1042_header
;
2031 encaps_len
= sizeof(rfc1042_header
);
2032 skip_header_bytes
-= 2;
2038 nh_pos
= skb_network_header(skb
) - skb
->data
;
2039 h_pos
= skb_transport_header(skb
) - skb
->data
;
2041 skb_pull(skb
, skip_header_bytes
);
2042 nh_pos
-= skip_header_bytes
;
2043 h_pos
-= skip_header_bytes
;
2045 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2048 * So we need to modify the skb header and hence need a copy of
2049 * that. The head_need variable above doesn't, so far, include
2050 * the needed header space that we don't need right away. If we
2051 * can, then we don't reallocate right now but only after the
2052 * frame arrives at the master device (if it does...)
2054 * If we cannot, however, then we will reallocate to include all
2055 * the ever needed space. Also, if we need to reallocate it anyway,
2056 * make it big enough for everything we may ever need.
2059 if (head_need
> 0 || skb_cloned(skb
)) {
2060 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2061 head_need
+= local
->tx_headroom
;
2062 head_need
= max_t(int, 0, head_need
);
2063 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2064 ieee80211_free_txskb(&local
->hw
, skb
);
2071 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2072 nh_pos
+= encaps_len
;
2073 h_pos
+= encaps_len
;
2076 #ifdef CONFIG_MAC80211_MESH
2077 if (meshhdrlen
> 0) {
2078 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2079 nh_pos
+= meshhdrlen
;
2080 h_pos
+= meshhdrlen
;
2084 if (ieee80211_is_data_qos(fc
)) {
2085 __le16
*qos_control
;
2087 qos_control
= (__le16
*) skb_push(skb
, 2);
2088 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2090 * Maybe we could actually set some fields here, for now just
2091 * initialise to zero to indicate no special operation.
2095 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2100 dev
->stats
.tx_packets
++;
2101 dev
->stats
.tx_bytes
+= skb
->len
;
2103 /* Update skb pointers to various headers since this modified frame
2104 * is going to go through Linux networking code that may potentially
2105 * need things like pointer to IP header. */
2106 skb_set_mac_header(skb
, 0);
2107 skb_set_network_header(skb
, nh_pos
);
2108 skb_set_transport_header(skb
, h_pos
);
2110 info
= IEEE80211_SKB_CB(skb
);
2111 memset(info
, 0, sizeof(*info
));
2113 dev
->trans_start
= jiffies
;
2115 info
->flags
= info_flags
;
2116 info
->ack_frame_id
= info_id
;
2118 ieee80211_xmit(sdata
, skb
, band
);
2121 return NETDEV_TX_OK
;
2127 return NETDEV_TX_OK
;
2132 * ieee80211_clear_tx_pending may not be called in a context where
2133 * it is possible that it packets could come in again.
2135 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2137 struct sk_buff
*skb
;
2140 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2141 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2142 ieee80211_free_txskb(&local
->hw
, skb
);
2147 * Returns false if the frame couldn't be transmitted but was queued instead,
2148 * which in this case means re-queued -- take as an indication to stop sending
2149 * more pending frames.
2151 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2152 struct sk_buff
*skb
)
2154 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2155 struct ieee80211_sub_if_data
*sdata
;
2156 struct sta_info
*sta
;
2157 struct ieee80211_hdr
*hdr
;
2159 struct ieee80211_chanctx_conf
*chanctx_conf
;
2161 sdata
= vif_to_sdata(info
->control
.vif
);
2163 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2164 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2165 if (unlikely(!chanctx_conf
)) {
2169 result
= ieee80211_tx(sdata
, skb
, true,
2170 chanctx_conf
->def
.chan
->band
);
2172 struct sk_buff_head skbs
;
2174 __skb_queue_head_init(&skbs
);
2175 __skb_queue_tail(&skbs
, skb
);
2177 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2178 sta
= sta_info_get(sdata
, hdr
->addr1
);
2180 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2187 * Transmit all pending packets. Called from tasklet.
2189 void ieee80211_tx_pending(unsigned long data
)
2191 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2192 unsigned long flags
;
2198 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2199 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2201 * If queue is stopped by something other than due to pending
2202 * frames, or we have no pending frames, proceed to next queue.
2204 if (local
->queue_stop_reasons
[i
] ||
2205 skb_queue_empty(&local
->pending
[i
]))
2208 while (!skb_queue_empty(&local
->pending
[i
])) {
2209 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2210 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2212 if (WARN_ON(!info
->control
.vif
)) {
2213 ieee80211_free_txskb(&local
->hw
, skb
);
2217 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2220 txok
= ieee80211_tx_pending_skb(local
, skb
);
2221 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2227 if (skb_queue_empty(&local
->pending
[i
]))
2228 ieee80211_propagate_queue_wake(local
, i
);
2230 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2235 /* functions for drivers to get certain frames */
2237 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2238 struct ps_data
*ps
, struct sk_buff
*skb
)
2242 int i
, have_bits
= 0, n1
, n2
;
2244 /* Generate bitmap for TIM only if there are any STAs in power save
2246 if (atomic_read(&ps
->num_sta_ps
) > 0)
2247 /* in the hope that this is faster than
2248 * checking byte-for-byte */
2249 have_bits
= !bitmap_empty((unsigned long*)ps
->tim
,
2250 IEEE80211_MAX_AID
+1);
2252 if (ps
->dtim_count
== 0)
2253 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2257 tim
= pos
= (u8
*) skb_put(skb
, 6);
2258 *pos
++ = WLAN_EID_TIM
;
2260 *pos
++ = ps
->dtim_count
;
2261 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2263 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2266 ps
->dtim_bc_mc
= aid0
== 1;
2269 /* Find largest even number N1 so that bits numbered 1 through
2270 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2271 * (N2 + 1) x 8 through 2007 are 0. */
2273 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2280 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2287 /* Bitmap control */
2289 /* Part Virt Bitmap */
2290 skb_put(skb
, n2
- n1
);
2291 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2293 tim
[1] = n2
- n1
+ 4;
2295 *pos
++ = aid0
; /* Bitmap control */
2296 *pos
++ = 0; /* Part Virt Bitmap */
2300 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2301 struct ps_data
*ps
, struct sk_buff
*skb
)
2303 struct ieee80211_local
*local
= sdata
->local
;
2306 * Not very nice, but we want to allow the driver to call
2307 * ieee80211_beacon_get() as a response to the set_tim()
2308 * callback. That, however, is already invoked under the
2309 * sta_lock to guarantee consistent and race-free update
2310 * of the tim bitmap in mac80211 and the driver.
2312 if (local
->tim_in_locked_section
) {
2313 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2315 spin_lock_bh(&local
->tim_lock
);
2316 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2317 spin_unlock_bh(&local
->tim_lock
);
2323 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2324 struct ieee80211_vif
*vif
,
2325 u16
*tim_offset
, u16
*tim_length
)
2327 struct ieee80211_local
*local
= hw_to_local(hw
);
2328 struct sk_buff
*skb
= NULL
;
2329 struct ieee80211_tx_info
*info
;
2330 struct ieee80211_sub_if_data
*sdata
= NULL
;
2331 enum ieee80211_band band
;
2332 struct ieee80211_tx_rate_control txrc
;
2333 struct ieee80211_chanctx_conf
*chanctx_conf
;
2337 sdata
= vif_to_sdata(vif
);
2338 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2340 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2348 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2349 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2350 struct beacon_data
*beacon
= rcu_dereference(ap
->beacon
);
2354 * headroom, head length,
2355 * tail length and maximum TIM length
2357 skb
= dev_alloc_skb(local
->tx_headroom
+
2359 beacon
->tail_len
+ 256);
2363 skb_reserve(skb
, local
->tx_headroom
);
2364 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2367 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
);
2370 *tim_offset
= beacon
->head_len
;
2372 *tim_length
= skb
->len
- beacon
->head_len
;
2375 memcpy(skb_put(skb
, beacon
->tail_len
),
2376 beacon
->tail
, beacon
->tail_len
);
2379 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2380 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2381 struct ieee80211_hdr
*hdr
;
2382 struct beacon_data
*presp
= rcu_dereference(ifibss
->presp
);
2387 skb
= dev_alloc_skb(local
->tx_headroom
+ presp
->head_len
);
2390 skb_reserve(skb
, local
->tx_headroom
);
2391 memcpy(skb_put(skb
, presp
->head_len
), presp
->head
,
2394 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2395 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2396 IEEE80211_STYPE_BEACON
);
2397 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2398 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2399 struct beacon_data
*bcn
= rcu_dereference(ifmsh
->beacon
);
2404 if (ifmsh
->sync_ops
)
2405 ifmsh
->sync_ops
->adjust_tbtt(
2408 skb
= dev_alloc_skb(local
->tx_headroom
+
2414 skb_reserve(skb
, local
->tx_headroom
);
2415 memcpy(skb_put(skb
, bcn
->head_len
), bcn
->head
, bcn
->head_len
);
2416 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
);
2417 memcpy(skb_put(skb
, bcn
->tail_len
), bcn
->tail
, bcn
->tail_len
);
2423 band
= chanctx_conf
->def
.chan
->band
;
2425 info
= IEEE80211_SKB_CB(skb
);
2427 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2428 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2431 memset(&txrc
, 0, sizeof(txrc
));
2433 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2434 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2436 txrc
.reported_rate
.idx
= -1;
2437 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2438 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2439 txrc
.max_rate_idx
= -1;
2441 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2443 rate_control_get_rate(sdata
, NULL
, &txrc
);
2445 info
->control
.vif
= vif
;
2447 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2448 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2449 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2454 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2456 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2457 struct ieee80211_vif
*vif
)
2459 struct ieee80211_if_ap
*ap
= NULL
;
2460 struct sk_buff
*skb
= NULL
;
2461 struct probe_resp
*presp
= NULL
;
2462 struct ieee80211_hdr
*hdr
;
2463 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2465 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2471 presp
= rcu_dereference(ap
->probe_resp
);
2475 skb
= dev_alloc_skb(presp
->len
);
2479 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2481 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2482 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2488 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2490 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2491 struct ieee80211_vif
*vif
)
2493 struct ieee80211_sub_if_data
*sdata
;
2494 struct ieee80211_if_managed
*ifmgd
;
2495 struct ieee80211_pspoll
*pspoll
;
2496 struct ieee80211_local
*local
;
2497 struct sk_buff
*skb
;
2499 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2502 sdata
= vif_to_sdata(vif
);
2503 ifmgd
= &sdata
->u
.mgd
;
2504 local
= sdata
->local
;
2506 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2510 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2512 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2513 memset(pspoll
, 0, sizeof(*pspoll
));
2514 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2515 IEEE80211_STYPE_PSPOLL
);
2516 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2518 /* aid in PS-Poll has its two MSBs each set to 1 */
2519 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2521 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2522 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2526 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2528 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2529 struct ieee80211_vif
*vif
)
2531 struct ieee80211_hdr_3addr
*nullfunc
;
2532 struct ieee80211_sub_if_data
*sdata
;
2533 struct ieee80211_if_managed
*ifmgd
;
2534 struct ieee80211_local
*local
;
2535 struct sk_buff
*skb
;
2537 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2540 sdata
= vif_to_sdata(vif
);
2541 ifmgd
= &sdata
->u
.mgd
;
2542 local
= sdata
->local
;
2544 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2548 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2550 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2552 memset(nullfunc
, 0, sizeof(*nullfunc
));
2553 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2554 IEEE80211_STYPE_NULLFUNC
|
2555 IEEE80211_FCTL_TODS
);
2556 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2557 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2558 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2562 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2564 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2565 struct ieee80211_vif
*vif
,
2566 const u8
*ssid
, size_t ssid_len
,
2569 struct ieee80211_sub_if_data
*sdata
;
2570 struct ieee80211_local
*local
;
2571 struct ieee80211_hdr_3addr
*hdr
;
2572 struct sk_buff
*skb
;
2576 sdata
= vif_to_sdata(vif
);
2577 local
= sdata
->local
;
2578 ie_ssid_len
= 2 + ssid_len
;
2580 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2581 ie_ssid_len
+ tailroom
);
2585 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2587 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2588 memset(hdr
, 0, sizeof(*hdr
));
2589 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2590 IEEE80211_STYPE_PROBE_REQ
);
2591 eth_broadcast_addr(hdr
->addr1
);
2592 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2593 eth_broadcast_addr(hdr
->addr3
);
2595 pos
= skb_put(skb
, ie_ssid_len
);
2596 *pos
++ = WLAN_EID_SSID
;
2599 memcpy(pos
, ssid
, ssid_len
);
2604 EXPORT_SYMBOL(ieee80211_probereq_get
);
2606 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2607 const void *frame
, size_t frame_len
,
2608 const struct ieee80211_tx_info
*frame_txctl
,
2609 struct ieee80211_rts
*rts
)
2611 const struct ieee80211_hdr
*hdr
= frame
;
2613 rts
->frame_control
=
2614 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2615 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2617 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2618 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2620 EXPORT_SYMBOL(ieee80211_rts_get
);
2622 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2623 const void *frame
, size_t frame_len
,
2624 const struct ieee80211_tx_info
*frame_txctl
,
2625 struct ieee80211_cts
*cts
)
2627 const struct ieee80211_hdr
*hdr
= frame
;
2629 cts
->frame_control
=
2630 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2631 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2632 frame_len
, frame_txctl
);
2633 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2635 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2638 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2639 struct ieee80211_vif
*vif
)
2641 struct ieee80211_local
*local
= hw_to_local(hw
);
2642 struct sk_buff
*skb
= NULL
;
2643 struct ieee80211_tx_data tx
;
2644 struct ieee80211_sub_if_data
*sdata
;
2646 struct ieee80211_tx_info
*info
;
2647 struct ieee80211_chanctx_conf
*chanctx_conf
;
2649 sdata
= vif_to_sdata(vif
);
2652 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2657 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2658 struct beacon_data
*beacon
=
2659 rcu_dereference(sdata
->u
.ap
.beacon
);
2661 if (!beacon
|| !beacon
->head
)
2664 ps
= &sdata
->u
.ap
.ps
;
2665 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2666 ps
= &sdata
->u
.mesh
.ps
;
2671 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
2672 goto out
; /* send buffered bc/mc only after DTIM beacon */
2675 skb
= skb_dequeue(&ps
->bc_buf
);
2678 local
->total_ps_buffered
--;
2680 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
2681 struct ieee80211_hdr
*hdr
=
2682 (struct ieee80211_hdr
*) skb
->data
;
2683 /* more buffered multicast/broadcast frames ==> set
2684 * MoreData flag in IEEE 802.11 header to inform PS
2686 hdr
->frame_control
|=
2687 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2690 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2691 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
2692 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2694 dev_kfree_skb_any(skb
);
2697 info
= IEEE80211_SKB_CB(skb
);
2699 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2700 info
->band
= chanctx_conf
->def
.chan
->band
;
2702 if (invoke_tx_handlers(&tx
))
2709 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2711 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
2712 struct sk_buff
*skb
, int tid
,
2713 enum ieee80211_band band
)
2715 int ac
= ieee802_1d_to_ac
[tid
& 7];
2717 skb_set_mac_header(skb
, 0);
2718 skb_set_network_header(skb
, 0);
2719 skb_set_transport_header(skb
, 0);
2721 skb_set_queue_mapping(skb
, ac
);
2722 skb
->priority
= tid
;
2724 skb
->dev
= sdata
->dev
;
2727 * The other path calling ieee80211_xmit is from the tasklet,
2728 * and while we can handle concurrent transmissions locking
2729 * requirements are that we do not come into tx with bhs on.
2732 ieee80211_xmit(sdata
, skb
, band
);