2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
40 struct sk_buff
*skb
, int group_addr
,
43 int rate
, mrate
, erp
, dur
, i
;
44 struct ieee80211_rate
*txrate
;
45 struct ieee80211_local
*local
= tx
->local
;
46 struct ieee80211_supported_band
*sband
;
47 struct ieee80211_hdr
*hdr
;
48 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 /* assume HW handles this */
51 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
55 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
58 sband
= local
->hw
.wiphy
->bands
[info
->band
];
59 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
61 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr
= (struct ieee80211_hdr
*)skb
->data
;
81 if (ieee80211_is_ctl(hdr
->frame_control
)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr
) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate
= sband
->bitrates
[0].bitrate
;
119 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
120 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
122 if (r
->bitrate
> txrate
->bitrate
)
125 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
128 switch (sband
->band
) {
129 case IEEE80211_BAND_2GHZ
: {
131 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
132 flag
= IEEE80211_RATE_MANDATORY_G
;
134 flag
= IEEE80211_RATE_MANDATORY_B
;
139 case IEEE80211_BAND_5GHZ
:
140 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
143 case IEEE80211_BAND_60GHZ
:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
158 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
165 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur
*= 2; /* ACK + SIFS */
172 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
173 txrate
->bitrate
, erp
,
174 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
177 return cpu_to_le16(dur
);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
184 struct ieee80211_local
*local
= tx
->local
;
185 struct ieee80211_if_managed
*ifmgd
;
187 /* driver doesn't support power save */
188 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
191 /* hardware does dynamic power save */
192 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
195 /* dynamic power save disabled */
196 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
199 /* we are scanning, don't enable power save */
203 if (!local
->ps_sdata
)
206 /* No point if we're going to suspend */
207 if (local
->quiescing
)
210 /* dynamic ps is supported only in managed mode */
211 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
214 ifmgd
= &tx
->sdata
->u
.mgd
;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
230 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
231 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
234 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
235 ieee80211_stop_queues_by_reason(&local
->hw
,
236 IEEE80211_QUEUE_STOP_REASON_PS
);
237 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
238 ieee80211_queue_work(&local
->hw
,
239 &local
->dynamic_ps_disable_work
);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd
->associated
)
246 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
247 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
256 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
257 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
260 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
263 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
265 !ieee80211_is_probe_req(hdr
->frame_control
) &&
266 !ieee80211_is_nullfunc(hdr
->frame_control
))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
283 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
286 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
290 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
292 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
293 if (unlikely(!assoc
&&
294 ieee80211_is_data(hdr
->frame_control
))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx
->sdata
,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
303 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
304 ieee80211_is_data(hdr
->frame_control
) &&
305 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
307 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
322 int total
= 0, purged
= 0;
324 struct ieee80211_sub_if_data
*sdata
;
325 struct sta_info
*sta
;
328 * virtual interfaces are protected by RCU
332 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
333 struct ieee80211_if_ap
*ap
;
334 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
337 skb
= skb_dequeue(&ap
->ps_bc_buf
);
342 total
+= skb_queue_len(&ap
->ps_bc_buf
);
346 * Drop one frame from each station from the lowest-priority
347 * AC that has frames at all.
349 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
352 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
353 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
354 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
357 ieee80211_free_txskb(&local
->hw
, skb
);
365 local
->total_ps_buffered
= total
;
366 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
369 static ieee80211_tx_result
370 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
372 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
373 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
376 * broadcast/multicast frame
378 * If any of the associated stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs only in AP/VLAN mode */
387 /* no buffering for ordered frames */
388 if (ieee80211_has_order(hdr
->frame_control
))
391 /* no stations in PS mode */
392 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
395 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
396 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
397 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
399 /* device releases frame after DTIM beacon */
400 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
403 /* buffered in mac80211 */
404 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
405 purge_old_ps_buffers(tx
->local
);
407 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
409 "BC TX buffer full - dropping the oldest frame\n");
410 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
412 tx
->local
->total_ps_buffered
++;
414 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
419 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
422 if (!ieee80211_is_mgmt(fc
))
425 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
428 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
435 static ieee80211_tx_result
436 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
438 struct sta_info
*sta
= tx
->sta
;
439 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
440 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
441 struct ieee80211_local
*local
= tx
->local
;
446 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
447 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
448 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
449 int ac
= skb_get_queue_mapping(tx
->skb
);
451 /* only deauth, disassoc and action are bufferable MMPDUs */
452 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
453 !ieee80211_is_deauth(hdr
->frame_control
) &&
454 !ieee80211_is_disassoc(hdr
->frame_control
) &&
455 !ieee80211_is_action(hdr
->frame_control
)) {
456 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
460 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
461 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
462 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
463 purge_old_ps_buffers(tx
->local
);
464 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
465 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
467 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
469 ieee80211_free_txskb(&local
->hw
, old
);
471 tx
->local
->total_ps_buffered
++;
473 info
->control
.jiffies
= jiffies
;
474 info
->control
.vif
= &tx
->sdata
->vif
;
475 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
476 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
478 if (!timer_pending(&local
->sta_cleanup
))
479 mod_timer(&local
->sta_cleanup
,
480 round_jiffies(jiffies
+
481 STA_INFO_CLEANUP_INTERVAL
));
484 * We queued up some frames, so the TIM bit might
485 * need to be set, recalculate it.
487 sta_info_recalc_tim(sta
);
490 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
492 "STA %pM in PS mode, but polling/in SP -> send frame\n",
499 static ieee80211_tx_result debug_noinline
500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
502 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
505 if (tx
->flags
& IEEE80211_TX_UNICAST
)
506 return ieee80211_tx_h_unicast_ps_buf(tx
);
508 return ieee80211_tx_h_multicast_ps_buf(tx
);
511 static ieee80211_tx_result debug_noinline
512 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
514 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
516 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
517 tx
->sdata
->control_port_no_encrypt
))
518 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
526 struct ieee80211_key
*key
;
527 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
528 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
530 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
532 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
534 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
535 is_multicast_ether_addr(hdr
->addr1
) &&
536 ieee80211_is_robust_mgmt_frame(hdr
) &&
537 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
539 else if (is_multicast_ether_addr(hdr
->addr1
) &&
540 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
542 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
543 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
545 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
547 else if (!tx
->sdata
->drop_unencrypted
)
549 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
551 else if (ieee80211_is_robust_mgmt_frame(hdr
) &&
552 !(ieee80211_is_action(hdr
->frame_control
) &&
553 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
555 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
556 !ieee80211_is_robust_mgmt_frame(hdr
))
559 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
564 bool skip_hw
= false;
566 tx
->key
->tx_rx_count
++;
567 /* TODO: add threshold stuff again */
569 switch (tx
->key
->conf
.cipher
) {
570 case WLAN_CIPHER_SUITE_WEP40
:
571 case WLAN_CIPHER_SUITE_WEP104
:
572 case WLAN_CIPHER_SUITE_TKIP
:
573 if (!ieee80211_is_data_present(hdr
->frame_control
))
576 case WLAN_CIPHER_SUITE_CCMP
:
577 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
578 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
582 skip_hw
= (tx
->key
->conf
.flags
&
583 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
584 ieee80211_is_mgmt(hdr
->frame_control
);
586 case WLAN_CIPHER_SUITE_AES_CMAC
:
587 if (!ieee80211_is_mgmt(hdr
->frame_control
))
592 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
595 if (!skip_hw
&& tx
->key
&&
596 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
597 info
->control
.hw_key
= &tx
->key
->conf
;
603 static ieee80211_tx_result debug_noinline
604 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
606 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
607 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
608 struct ieee80211_supported_band
*sband
;
609 struct ieee80211_rate
*rate
;
612 bool inval
= false, rts
= false, short_preamble
= false;
613 struct ieee80211_tx_rate_control txrc
;
616 memset(&txrc
, 0, sizeof(txrc
));
618 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
620 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
621 tx
->local
->hw
.wiphy
->frag_threshold
);
623 /* set up the tx rate control struct we give the RC algo */
624 txrc
.hw
= &tx
->local
->hw
;
626 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
628 txrc
.reported_rate
.idx
= -1;
629 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
630 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
631 txrc
.max_rate_idx
= -1;
633 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
634 memcpy(txrc
.rate_idx_mcs_mask
,
635 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
],
636 sizeof(txrc
.rate_idx_mcs_mask
));
637 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
638 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
639 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
641 /* set up RTS protection if desired */
642 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
643 txrc
.rts
= rts
= true;
647 * Use short preamble if the BSS can handle it, but not for
648 * management frames unless we know the receiver can handle
649 * that -- the management frame might be to a station that
650 * just wants a probe response.
652 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
653 (ieee80211_is_data(hdr
->frame_control
) ||
654 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
655 txrc
.short_preamble
= short_preamble
= true;
658 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
661 * Lets not bother rate control if we're associated and cannot
662 * talk to the sta. This should not happen.
664 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
665 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
666 "%s: Dropped data frame as no usable bitrate found while "
667 "scanning and associated. Target station: "
668 "%pM on %d GHz band\n",
669 tx
->sdata
->name
, hdr
->addr1
,
674 * If we're associated with the sta at this point we know we can at
675 * least send the frame at the lowest bit rate.
677 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
679 if (unlikely(info
->control
.rates
[0].idx
< 0))
682 if (txrc
.reported_rate
.idx
< 0) {
683 txrc
.reported_rate
= info
->control
.rates
[0];
684 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
685 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
687 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
689 if (unlikely(!info
->control
.rates
[0].count
))
690 info
->control
.rates
[0].count
= 1;
692 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
693 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
694 info
->control
.rates
[0].count
= 1;
696 if (is_multicast_ether_addr(hdr
->addr1
)) {
698 * XXX: verify the rate is in the basic rateset
704 * set up the RTS/CTS rate as the fastest basic rate
705 * that is not faster than the data rate
707 * XXX: Should this check all retry rates?
709 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
712 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
714 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
715 /* must be a basic rate */
716 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
718 /* must not be faster than the data rate */
719 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
722 if (sband
->bitrates
[baserate
].bitrate
<
723 sband
->bitrates
[i
].bitrate
)
727 info
->control
.rts_cts_rate_idx
= baserate
;
730 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
732 * make sure there's no valid rate following
733 * an invalid one, just in case drivers don't
734 * take the API seriously to stop at -1.
737 info
->control
.rates
[i
].idx
= -1;
740 if (info
->control
.rates
[i
].idx
< 0) {
746 * For now assume MCS is already set up correctly, this
749 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
750 WARN_ON(info
->control
.rates
[i
].idx
> 76);
754 /* set up RTS protection if desired */
756 info
->control
.rates
[i
].flags
|=
757 IEEE80211_TX_RC_USE_RTS_CTS
;
760 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
761 sband
->n_bitrates
)) {
762 info
->control
.rates
[i
].idx
= -1;
766 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
768 /* set up short preamble */
769 if (short_preamble
&&
770 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
771 info
->control
.rates
[i
].flags
|=
772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
774 /* set up G protection */
775 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
776 rate
->flags
& IEEE80211_RATE_ERP_G
)
777 info
->control
.rates
[i
].flags
|=
778 IEEE80211_TX_RC_USE_CTS_PROTECT
;
784 static ieee80211_tx_result debug_noinline
785 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
787 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
788 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
794 * Packet injection may want to control the sequence
795 * number, if we have no matching interface then we
796 * neither assign one ourselves nor ask the driver to.
798 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
801 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
804 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
807 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
811 * Anything but QoS data that has a sequence number field
812 * (is long enough) gets a sequence number from the global
815 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
816 /* driver should assign sequence number */
817 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
818 /* for pure STA mode without beacons, we can do it */
819 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
820 tx
->sdata
->sequence_number
+= 0x10;
825 * This should be true for injected/management frames only, for
826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
827 * above since they are not QoS-data frames.
832 /* include per-STA, per-TID sequence counter */
834 qc
= ieee80211_get_qos_ctl(hdr
);
835 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
836 seq
= &tx
->sta
->tid_seq
[tid
];
838 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
840 /* Increase the sequence number. */
841 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
846 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
847 struct sk_buff
*skb
, int hdrlen
,
850 struct ieee80211_local
*local
= tx
->local
;
851 struct ieee80211_tx_info
*info
;
853 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
854 int pos
= hdrlen
+ per_fragm
;
855 int rem
= skb
->len
- hdrlen
- per_fragm
;
857 if (WARN_ON(rem
< 0))
860 /* first fragment was already added to queue by caller */
863 int fraglen
= per_fragm
;
868 tmp
= dev_alloc_skb(local
->tx_headroom
+
870 IEEE80211_ENCRYPT_HEADROOM
+
871 IEEE80211_ENCRYPT_TAILROOM
);
875 __skb_queue_tail(&tx
->skbs
, tmp
);
877 skb_reserve(tmp
, local
->tx_headroom
+
878 IEEE80211_ENCRYPT_HEADROOM
);
879 /* copy control information */
880 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
882 info
= IEEE80211_SKB_CB(tmp
);
883 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
884 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
887 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
889 skb_copy_queue_mapping(tmp
, skb
);
890 tmp
->priority
= skb
->priority
;
893 /* copy header and data */
894 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
895 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
900 /* adjust first fragment's length */
901 skb
->len
= hdrlen
+ per_fragm
;
905 static ieee80211_tx_result debug_noinline
906 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
908 struct sk_buff
*skb
= tx
->skb
;
909 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
910 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
911 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
915 /* no matter what happens, tx->skb moves to tx->skbs */
916 __skb_queue_tail(&tx
->skbs
, skb
);
919 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
922 if (tx
->local
->ops
->set_frag_threshold
)
926 * Warn when submitting a fragmented A-MPDU frame and drop it.
927 * This scenario is handled in ieee80211_tx_prepare but extra
928 * caution taken here as fragmented ampdu may cause Tx stop.
930 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
933 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
935 /* internal error, why isn't DONTFRAG set? */
936 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
940 * Now fragment the frame. This will allocate all the fragments and
941 * chain them (using skb as the first fragment) to skb->next.
942 * During transmission, we will remove the successfully transmitted
943 * fragments from this list. When the low-level driver rejects one
944 * of the fragments then we will simply pretend to accept the skb
945 * but store it away as pending.
947 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
950 /* update duration/seq/flags of fragments */
953 skb_queue_walk(&tx
->skbs
, skb
) {
955 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
957 hdr
= (void *)skb
->data
;
958 info
= IEEE80211_SKB_CB(skb
);
960 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
961 hdr
->frame_control
|= morefrags
;
963 * No multi-rate retries for fragmented frames, that
964 * would completely throw off the NAV at other STAs.
966 info
->control
.rates
[1].idx
= -1;
967 info
->control
.rates
[2].idx
= -1;
968 info
->control
.rates
[3].idx
= -1;
969 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
970 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
972 hdr
->frame_control
&= ~morefrags
;
975 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
982 static ieee80211_tx_result debug_noinline
983 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
990 tx
->sta
->tx_packets
++;
991 skb_queue_walk(&tx
->skbs
, skb
) {
992 tx
->sta
->tx_fragments
++;
993 tx
->sta
->tx_bytes
+= skb
->len
;
999 static ieee80211_tx_result debug_noinline
1000 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1005 switch (tx
->key
->conf
.cipher
) {
1006 case WLAN_CIPHER_SUITE_WEP40
:
1007 case WLAN_CIPHER_SUITE_WEP104
:
1008 return ieee80211_crypto_wep_encrypt(tx
);
1009 case WLAN_CIPHER_SUITE_TKIP
:
1010 return ieee80211_crypto_tkip_encrypt(tx
);
1011 case WLAN_CIPHER_SUITE_CCMP
:
1012 return ieee80211_crypto_ccmp_encrypt(tx
);
1013 case WLAN_CIPHER_SUITE_AES_CMAC
:
1014 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1016 return ieee80211_crypto_hw_encrypt(tx
);
1022 static ieee80211_tx_result debug_noinline
1023 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1025 struct sk_buff
*skb
;
1026 struct ieee80211_hdr
*hdr
;
1030 skb_queue_walk(&tx
->skbs
, skb
) {
1031 hdr
= (void *) skb
->data
;
1032 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1033 break; /* must not overwrite AID */
1034 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1035 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1036 next_len
= next
->len
;
1039 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1042 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1048 /* actual transmit path */
1050 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1051 struct sk_buff
*skb
,
1052 struct ieee80211_tx_info
*info
,
1053 struct tid_ampdu_tx
*tid_tx
,
1056 bool queued
= false;
1057 bool reset_agg_timer
= false;
1058 struct sk_buff
*purge_skb
= NULL
;
1060 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1061 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1062 reset_agg_timer
= true;
1063 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1065 * nothing -- this aggregation session is being started
1066 * but that might still fail with the driver
1069 spin_lock(&tx
->sta
->lock
);
1071 * Need to re-check now, because we may get here
1073 * 1) in the window during which the setup is actually
1074 * already done, but not marked yet because not all
1075 * packets are spliced over to the driver pending
1076 * queue yet -- if this happened we acquire the lock
1077 * either before or after the splice happens, but
1078 * need to recheck which of these cases happened.
1080 * 2) during session teardown, if the OPERATIONAL bit
1081 * was cleared due to the teardown but the pointer
1082 * hasn't been assigned NULL yet (or we loaded it
1083 * before it was assigned) -- in this case it may
1084 * now be NULL which means we should just let the
1085 * packet pass through because splicing the frames
1086 * back is already done.
1088 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1091 /* do nothing, let packet pass through */
1092 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1093 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1094 reset_agg_timer
= true;
1097 info
->control
.vif
= &tx
->sdata
->vif
;
1098 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1099 __skb_queue_tail(&tid_tx
->pending
, skb
);
1100 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1101 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1103 spin_unlock(&tx
->sta
->lock
);
1106 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1109 /* reset session timer */
1110 if (reset_agg_timer
&& tid_tx
->timeout
)
1111 tid_tx
->last_tx
= jiffies
;
1119 static ieee80211_tx_result
1120 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1121 struct ieee80211_tx_data
*tx
,
1122 struct sk_buff
*skb
)
1124 struct ieee80211_local
*local
= sdata
->local
;
1125 struct ieee80211_hdr
*hdr
;
1126 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1130 memset(tx
, 0, sizeof(*tx
));
1134 __skb_queue_head_init(&tx
->skbs
);
1137 * If this flag is set to true anywhere, and we get here,
1138 * we are doing the needed processing, so remove the flag
1141 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1143 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1145 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1146 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1147 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1149 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1150 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1151 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1154 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1156 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1157 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1158 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1159 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1160 struct tid_ampdu_tx
*tid_tx
;
1162 qc
= ieee80211_get_qos_ctl(hdr
);
1163 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1165 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1169 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1172 if (unlikely(queued
))
1177 if (is_multicast_ether_addr(hdr
->addr1
)) {
1178 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1179 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1181 tx
->flags
|= IEEE80211_TX_UNICAST
;
1183 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1184 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1185 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1186 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1187 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1191 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1192 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1193 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1195 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1200 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1201 struct ieee80211_vif
*vif
,
1202 struct ieee80211_sta
*sta
,
1203 struct sk_buff_head
*skbs
,
1206 struct ieee80211_tx_control control
;
1207 struct sk_buff
*skb
, *tmp
;
1208 unsigned long flags
;
1210 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1211 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1212 int q
= info
->hw_queue
;
1214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1215 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1216 __skb_unlink(skb
, skbs
);
1217 ieee80211_free_txskb(&local
->hw
, skb
);
1222 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1223 if (local
->queue_stop_reasons
[q
] ||
1224 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1226 * Since queue is stopped, queue up frames for later
1227 * transmission from the tx-pending tasklet when the
1228 * queue is woken again.
1231 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1233 skb_queue_splice_tail_init(skbs
,
1234 &local
->pending
[q
]);
1236 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1240 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1242 info
->control
.vif
= vif
;
1245 __skb_unlink(skb
, skbs
);
1246 drv_tx(local
, &control
, skb
);
1253 * Returns false if the frame couldn't be transmitted but was queued instead.
1255 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1256 struct sk_buff_head
*skbs
, int led_len
,
1257 struct sta_info
*sta
, bool txpending
)
1259 struct ieee80211_tx_info
*info
;
1260 struct ieee80211_sub_if_data
*sdata
;
1261 struct ieee80211_vif
*vif
;
1262 struct ieee80211_sta
*pubsta
;
1263 struct sk_buff
*skb
;
1267 if (WARN_ON(skb_queue_empty(skbs
)))
1270 skb
= skb_peek(skbs
);
1271 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1272 info
= IEEE80211_SKB_CB(skb
);
1273 sdata
= vif_to_sdata(info
->control
.vif
);
1274 if (sta
&& !sta
->uploaded
)
1282 switch (sdata
->vif
.type
) {
1283 case NL80211_IFTYPE_MONITOR
:
1284 sdata
= rcu_dereference(local
->monitor_sdata
);
1288 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1289 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1295 case NL80211_IFTYPE_AP_VLAN
:
1296 sdata
= container_of(sdata
->bss
,
1297 struct ieee80211_sub_if_data
, u
.ap
);
1304 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1307 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1308 ieee80211_led_tx(local
, 1);
1310 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1316 * Invoke TX handlers, return 0 on success and non-zero if the
1317 * frame was dropped or queued.
1319 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1321 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1322 ieee80211_tx_result res
= TX_DROP
;
1324 #define CALL_TXH(txh) \
1327 if (res != TX_CONTINUE) \
1331 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1332 CALL_TXH(ieee80211_tx_h_check_assoc
);
1333 CALL_TXH(ieee80211_tx_h_ps_buf
);
1334 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1335 CALL_TXH(ieee80211_tx_h_select_key
);
1336 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1337 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1339 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1340 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1345 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1346 CALL_TXH(ieee80211_tx_h_sequence
);
1347 CALL_TXH(ieee80211_tx_h_fragment
);
1348 /* handlers after fragment must be aware of tx info fragmentation! */
1349 CALL_TXH(ieee80211_tx_h_stats
);
1350 CALL_TXH(ieee80211_tx_h_encrypt
);
1351 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1352 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1356 if (unlikely(res
== TX_DROP
)) {
1357 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1359 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1361 __skb_queue_purge(&tx
->skbs
);
1363 } else if (unlikely(res
== TX_QUEUED
)) {
1364 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1372 * Returns false if the frame couldn't be transmitted but was queued instead.
1374 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1375 struct sk_buff
*skb
, bool txpending
)
1377 struct ieee80211_local
*local
= sdata
->local
;
1378 struct ieee80211_tx_data tx
;
1379 ieee80211_tx_result res_prepare
;
1380 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1384 if (unlikely(skb
->len
< 10)) {
1391 /* initialises tx */
1393 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1395 if (unlikely(res_prepare
== TX_DROP
)) {
1396 ieee80211_free_txskb(&local
->hw
, skb
);
1398 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1402 info
->band
= local
->hw
.conf
.channel
->band
;
1404 /* set up hw_queue value early */
1405 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1406 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1408 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1410 if (!invoke_tx_handlers(&tx
))
1411 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1418 /* device xmit handlers */
1420 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1421 struct sk_buff
*skb
,
1422 int head_need
, bool may_encrypt
)
1424 struct ieee80211_local
*local
= sdata
->local
;
1427 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1428 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1429 tail_need
-= skb_tailroom(skb
);
1430 tail_need
= max_t(int, tail_need
, 0);
1433 if (skb_cloned(skb
))
1434 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1435 else if (head_need
|| tail_need
)
1436 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1440 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1441 wiphy_debug(local
->hw
.wiphy
,
1442 "failed to reallocate TX buffer\n");
1449 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1451 struct ieee80211_local
*local
= sdata
->local
;
1452 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1453 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1459 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1461 headroom
= local
->tx_headroom
;
1463 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1464 headroom
-= skb_headroom(skb
);
1465 headroom
= max_t(int, 0, headroom
);
1467 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1468 ieee80211_free_txskb(&local
->hw
, skb
);
1473 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1474 info
->control
.vif
= &sdata
->vif
;
1476 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1477 ieee80211_is_data(hdr
->frame_control
) &&
1478 !is_multicast_ether_addr(hdr
->addr1
) &&
1479 mesh_nexthop_resolve(skb
, sdata
)) {
1480 /* skb queued: don't free */
1485 ieee80211_set_qos_hdr(sdata
, skb
);
1486 ieee80211_tx(sdata
, skb
, false);
1490 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1492 struct ieee80211_radiotap_iterator iterator
;
1493 struct ieee80211_radiotap_header
*rthdr
=
1494 (struct ieee80211_radiotap_header
*) skb
->data
;
1495 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1496 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1500 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1501 IEEE80211_TX_CTL_DONTFRAG
;
1504 * for every radiotap entry that is present
1505 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1506 * entries present, or -EINVAL on error)
1510 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1515 /* see if this argument is something we can use */
1516 switch (iterator
.this_arg_index
) {
1518 * You must take care when dereferencing iterator.this_arg
1519 * for multibyte types... the pointer is not aligned. Use
1520 * get_unaligned((type *)iterator.this_arg) to dereference
1521 * iterator.this_arg for type "type" safely on all arches.
1523 case IEEE80211_RADIOTAP_FLAGS
:
1524 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1526 * this indicates that the skb we have been
1527 * handed has the 32-bit FCS CRC at the end...
1528 * we should react to that by snipping it off
1529 * because it will be recomputed and added
1532 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1535 skb_trim(skb
, skb
->len
- FCS_LEN
);
1537 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1538 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1539 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1540 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1543 case IEEE80211_RADIOTAP_TX_FLAGS
:
1544 txflags
= get_unaligned_le16(iterator
.this_arg
);
1545 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1546 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1550 * Please update the file
1551 * Documentation/networking/mac80211-injection.txt
1552 * when parsing new fields here.
1560 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1564 * remove the radiotap header
1565 * iterator->_max_length was sanity-checked against
1566 * skb->len by iterator init
1568 skb_pull(skb
, iterator
._max_length
);
1573 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1574 struct net_device
*dev
)
1576 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1577 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1578 struct ieee80211_radiotap_header
*prthdr
=
1579 (struct ieee80211_radiotap_header
*)skb
->data
;
1580 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1581 struct ieee80211_hdr
*hdr
;
1582 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1587 * Frame injection is not allowed if beaconing is not allowed
1588 * or if we need radar detection. Beaconing is usually not allowed when
1589 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1590 * Passive scan is also used in world regulatory domains where
1591 * your country is not known and as such it should be treated as
1592 * NO TX unless the channel is explicitly allowed in which case
1593 * your current regulatory domain would not have the passive scan
1596 * Since AP mode uses monitor interfaces to inject/TX management
1597 * frames we can make AP mode the exception to this rule once it
1598 * supports radar detection as its implementation can deal with
1599 * radar detection by itself. We can do that later by adding a
1600 * monitor flag interfaces used for AP support.
1602 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1603 IEEE80211_CHAN_PASSIVE_SCAN
)))
1606 /* check for not even having the fixed radiotap header part */
1607 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1608 goto fail
; /* too short to be possibly valid */
1610 /* is it a header version we can trust to find length from? */
1611 if (unlikely(prthdr
->it_version
))
1612 goto fail
; /* only version 0 is supported */
1614 /* then there must be a radiotap header with a length we can use */
1615 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1617 /* does the skb contain enough to deliver on the alleged length? */
1618 if (unlikely(skb
->len
< len_rthdr
))
1619 goto fail
; /* skb too short for claimed rt header extent */
1622 * fix up the pointers accounting for the radiotap
1623 * header still being in there. We are being given
1624 * a precooked IEEE80211 header so no need for
1627 skb_set_mac_header(skb
, len_rthdr
);
1629 * these are just fixed to the end of the rt area since we
1630 * don't have any better information and at this point, nobody cares
1632 skb_set_network_header(skb
, len_rthdr
);
1633 skb_set_transport_header(skb
, len_rthdr
);
1635 if (skb
->len
< len_rthdr
+ 2)
1638 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1639 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1641 if (skb
->len
< len_rthdr
+ hdrlen
)
1645 * Initialize skb->protocol if the injected frame is a data frame
1646 * carrying a rfc1042 header
1648 if (ieee80211_is_data(hdr
->frame_control
) &&
1649 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1650 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1652 if (ether_addr_equal(payload
, rfc1042_header
))
1653 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1657 memset(info
, 0, sizeof(*info
));
1659 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1660 IEEE80211_TX_CTL_INJECTED
;
1662 /* process and remove the injection radiotap header */
1663 if (!ieee80211_parse_tx_radiotap(skb
))
1669 * We process outgoing injected frames that have a local address
1670 * we handle as though they are non-injected frames.
1671 * This code here isn't entirely correct, the local MAC address
1672 * isn't always enough to find the interface to use; for proper
1673 * VLAN/WDS support we will need a different mechanism (which
1674 * likely isn't going to be monitor interfaces).
1676 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1678 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1679 if (!ieee80211_sdata_running(tmp_sdata
))
1681 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1682 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1683 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1685 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1691 ieee80211_xmit(sdata
, skb
);
1694 return NETDEV_TX_OK
;
1698 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1702 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1703 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1704 * @skb: packet to be sent
1705 * @dev: incoming interface
1707 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1708 * not be freed, and caller is responsible for either retrying later or freeing
1711 * This function takes in an Ethernet header and encapsulates it with suitable
1712 * IEEE 802.11 header based on which interface the packet is coming in. The
1713 * encapsulated packet will then be passed to master interface, wlan#.11, for
1714 * transmission (through low-level driver).
1716 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1717 struct net_device
*dev
)
1719 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1720 struct ieee80211_local
*local
= sdata
->local
;
1721 struct ieee80211_tx_info
*info
;
1723 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1725 struct ieee80211_hdr hdr
;
1726 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1727 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1728 const u8
*encaps_data
;
1729 int encaps_len
, skip_header_bytes
;
1731 struct sta_info
*sta
= NULL
;
1732 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1733 bool tdls_direct
= false;
1738 if (unlikely(skb
->len
< ETH_HLEN
))
1741 /* convert Ethernet header to proper 802.11 header (based on
1742 * operation mode) */
1743 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1744 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1746 switch (sdata
->vif
.type
) {
1747 case NL80211_IFTYPE_AP_VLAN
:
1749 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1751 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1753 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1754 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1755 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1756 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1758 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1759 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1765 case NL80211_IFTYPE_AP
:
1766 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1768 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1769 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1770 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1773 case NL80211_IFTYPE_WDS
:
1774 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1776 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1777 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1778 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1779 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1782 #ifdef CONFIG_MAC80211_MESH
1783 case NL80211_IFTYPE_MESH_POINT
:
1784 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1785 /* Do not send frames with mesh_ttl == 0 */
1786 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1790 if (!is_multicast_ether_addr(skb
->data
)) {
1791 mpath
= mesh_path_lookup(skb
->data
, sdata
);
1793 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1797 * Use address extension if it is a packet from
1798 * another interface or if we know the destination
1799 * is being proxied by a portal (i.e. portal address
1800 * differs from proxied address)
1802 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1803 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1804 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1805 skb
->data
, skb
->data
+ ETH_ALEN
);
1807 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1810 /* DS -> MBSS (802.11-2012 13.11.3.3).
1811 * For unicast with unknown forwarding information,
1812 * destination might be in the MBSS or if that fails
1813 * forwarded to another mesh gate. In either case
1814 * resolution will be handled in ieee80211_xmit(), so
1815 * leave the original DA. This also works for mcast */
1816 const u8
*mesh_da
= skb
->data
;
1819 mesh_da
= mppath
->mpp
;
1821 mesh_da
= mpath
->dst
;
1824 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1825 mesh_da
, sdata
->vif
.addr
);
1826 if (is_multicast_ether_addr(mesh_da
))
1827 /* DA TA mSA AE:SA */
1829 ieee80211_new_mesh_header(&mesh_hdr
,
1831 skb
->data
+ ETH_ALEN
,
1834 /* RA TA mDA mSA AE:DA SA */
1836 ieee80211_new_mesh_header(&mesh_hdr
,
1839 skb
->data
+ ETH_ALEN
);
1844 case NL80211_IFTYPE_STATION
:
1845 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1846 bool tdls_peer
= false;
1849 sta
= sta_info_get(sdata
, skb
->data
);
1851 authorized
= test_sta_flag(sta
,
1852 WLAN_STA_AUTHORIZED
);
1853 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1854 tdls_peer
= test_sta_flag(sta
,
1855 WLAN_STA_TDLS_PEER
);
1856 tdls_auth
= test_sta_flag(sta
,
1857 WLAN_STA_TDLS_PEER_AUTH
);
1862 * If the TDLS link is enabled, send everything
1863 * directly. Otherwise, allow TDLS setup frames
1864 * to be transmitted indirectly.
1866 tdls_direct
= tdls_peer
&& (tdls_auth
||
1867 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1868 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1872 /* link during setup - throw out frames to peer */
1877 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1878 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1879 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1881 } else if (sdata
->u
.mgd
.use_4addr
&&
1882 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1883 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1884 IEEE80211_FCTL_TODS
);
1886 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1887 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1888 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1889 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1892 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1894 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1895 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1896 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1900 case NL80211_IFTYPE_ADHOC
:
1902 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1903 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1904 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1912 * There's no need to try to look up the destination
1913 * if it is a multicast address (which can only happen
1916 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1919 sta
= sta_info_get(sdata
, hdr
.addr1
);
1921 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1922 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1927 /* For mesh, the use of the QoS header is mandatory */
1928 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1931 /* receiver and we are QoS enabled, use a QoS type frame */
1932 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1933 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1938 * Drop unicast frames to unauthorised stations unless they are
1939 * EAPOL frames from the local station.
1941 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1942 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1943 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1944 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1945 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1946 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1947 dev
->name
, hdr
.addr1
);
1950 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1955 if (unlikely(!multicast
&& skb
->sk
&&
1956 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1957 struct sk_buff
*orig_skb
= skb
;
1959 skb
= skb_clone(skb
, GFP_ATOMIC
);
1961 unsigned long flags
;
1964 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1965 r
= idr_get_new_above(&local
->ack_status_frames
,
1968 idr_pre_get(&local
->ack_status_frames
,
1970 r
= idr_get_new_above(&local
->ack_status_frames
,
1973 if (WARN_ON(!id
) || id
> 0xffff) {
1974 idr_remove(&local
->ack_status_frames
, id
);
1977 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1981 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1982 } else if (skb_shared(skb
)) {
1983 kfree_skb(orig_skb
);
1989 /* couldn't clone -- lose tx status ... */
1995 * If the skb is shared we need to obtain our own copy.
1997 if (skb_shared(skb
)) {
1998 struct sk_buff
*tmp_skb
= skb
;
2000 /* can't happen -- skb is a clone if info_id != 0 */
2003 skb
= skb_clone(skb
, GFP_ATOMIC
);
2010 hdr
.frame_control
= fc
;
2011 hdr
.duration_id
= 0;
2014 skip_header_bytes
= ETH_HLEN
;
2015 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2016 encaps_data
= bridge_tunnel_header
;
2017 encaps_len
= sizeof(bridge_tunnel_header
);
2018 skip_header_bytes
-= 2;
2019 } else if (ethertype
>= 0x600) {
2020 encaps_data
= rfc1042_header
;
2021 encaps_len
= sizeof(rfc1042_header
);
2022 skip_header_bytes
-= 2;
2028 nh_pos
= skb_network_header(skb
) - skb
->data
;
2029 h_pos
= skb_transport_header(skb
) - skb
->data
;
2031 skb_pull(skb
, skip_header_bytes
);
2032 nh_pos
-= skip_header_bytes
;
2033 h_pos
-= skip_header_bytes
;
2035 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2038 * So we need to modify the skb header and hence need a copy of
2039 * that. The head_need variable above doesn't, so far, include
2040 * the needed header space that we don't need right away. If we
2041 * can, then we don't reallocate right now but only after the
2042 * frame arrives at the master device (if it does...)
2044 * If we cannot, however, then we will reallocate to include all
2045 * the ever needed space. Also, if we need to reallocate it anyway,
2046 * make it big enough for everything we may ever need.
2049 if (head_need
> 0 || skb_cloned(skb
)) {
2050 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2051 head_need
+= local
->tx_headroom
;
2052 head_need
= max_t(int, 0, head_need
);
2053 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2054 ieee80211_free_txskb(&local
->hw
, skb
);
2055 return NETDEV_TX_OK
;
2060 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2061 nh_pos
+= encaps_len
;
2062 h_pos
+= encaps_len
;
2065 #ifdef CONFIG_MAC80211_MESH
2066 if (meshhdrlen
> 0) {
2067 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2068 nh_pos
+= meshhdrlen
;
2069 h_pos
+= meshhdrlen
;
2073 if (ieee80211_is_data_qos(fc
)) {
2074 __le16
*qos_control
;
2076 qos_control
= (__le16
*) skb_push(skb
, 2);
2077 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2079 * Maybe we could actually set some fields here, for now just
2080 * initialise to zero to indicate no special operation.
2084 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2089 dev
->stats
.tx_packets
++;
2090 dev
->stats
.tx_bytes
+= skb
->len
;
2092 /* Update skb pointers to various headers since this modified frame
2093 * is going to go through Linux networking code that may potentially
2094 * need things like pointer to IP header. */
2095 skb_set_mac_header(skb
, 0);
2096 skb_set_network_header(skb
, nh_pos
);
2097 skb_set_transport_header(skb
, h_pos
);
2099 info
= IEEE80211_SKB_CB(skb
);
2100 memset(info
, 0, sizeof(*info
));
2102 dev
->trans_start
= jiffies
;
2104 info
->flags
= info_flags
;
2105 info
->ack_frame_id
= info_id
;
2107 ieee80211_xmit(sdata
, skb
);
2109 return NETDEV_TX_OK
;
2113 return NETDEV_TX_OK
;
2118 * ieee80211_clear_tx_pending may not be called in a context where
2119 * it is possible that it packets could come in again.
2121 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2125 for (i
= 0; i
< local
->hw
.queues
; i
++)
2126 skb_queue_purge(&local
->pending
[i
]);
2130 * Returns false if the frame couldn't be transmitted but was queued instead,
2131 * which in this case means re-queued -- take as an indication to stop sending
2132 * more pending frames.
2134 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2135 struct sk_buff
*skb
)
2137 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2138 struct ieee80211_sub_if_data
*sdata
;
2139 struct sta_info
*sta
;
2140 struct ieee80211_hdr
*hdr
;
2143 sdata
= vif_to_sdata(info
->control
.vif
);
2145 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2146 result
= ieee80211_tx(sdata
, skb
, true);
2148 struct sk_buff_head skbs
;
2150 __skb_queue_head_init(&skbs
);
2151 __skb_queue_tail(&skbs
, skb
);
2153 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2154 sta
= sta_info_get(sdata
, hdr
->addr1
);
2156 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2163 * Transmit all pending packets. Called from tasklet.
2165 void ieee80211_tx_pending(unsigned long data
)
2167 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2168 unsigned long flags
;
2174 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2175 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2177 * If queue is stopped by something other than due to pending
2178 * frames, or we have no pending frames, proceed to next queue.
2180 if (local
->queue_stop_reasons
[i
] ||
2181 skb_queue_empty(&local
->pending
[i
]))
2184 while (!skb_queue_empty(&local
->pending
[i
])) {
2185 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2186 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2188 if (WARN_ON(!info
->control
.vif
)) {
2189 ieee80211_free_txskb(&local
->hw
, skb
);
2193 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2196 txok
= ieee80211_tx_pending_skb(local
, skb
);
2197 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2203 if (skb_queue_empty(&local
->pending
[i
]))
2204 ieee80211_propagate_queue_wake(local
, i
);
2206 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2211 /* functions for drivers to get certain frames */
2213 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2214 struct ieee80211_if_ap
*bss
,
2215 struct sk_buff
*skb
,
2216 struct beacon_data
*beacon
)
2220 int i
, have_bits
= 0, n1
, n2
;
2222 /* Generate bitmap for TIM only if there are any STAs in power save
2224 if (atomic_read(&bss
->num_sta_ps
) > 0)
2225 /* in the hope that this is faster than
2226 * checking byte-for-byte */
2227 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2228 IEEE80211_MAX_AID
+1);
2230 if (bss
->dtim_count
== 0)
2231 bss
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2235 tim
= pos
= (u8
*) skb_put(skb
, 6);
2236 *pos
++ = WLAN_EID_TIM
;
2238 *pos
++ = bss
->dtim_count
;
2239 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2241 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2244 bss
->dtim_bc_mc
= aid0
== 1;
2247 /* Find largest even number N1 so that bits numbered 1 through
2248 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2249 * (N2 + 1) x 8 through 2007 are 0. */
2251 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2258 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2265 /* Bitmap control */
2267 /* Part Virt Bitmap */
2268 skb_put(skb
, n2
- n1
);
2269 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2271 tim
[1] = n2
- n1
+ 4;
2273 *pos
++ = aid0
; /* Bitmap control */
2274 *pos
++ = 0; /* Part Virt Bitmap */
2278 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2279 struct ieee80211_vif
*vif
,
2280 u16
*tim_offset
, u16
*tim_length
)
2282 struct ieee80211_local
*local
= hw_to_local(hw
);
2283 struct sk_buff
*skb
= NULL
;
2284 struct ieee80211_tx_info
*info
;
2285 struct ieee80211_sub_if_data
*sdata
= NULL
;
2286 struct ieee80211_if_ap
*ap
= NULL
;
2287 struct beacon_data
*beacon
;
2288 enum ieee80211_band band
= local
->oper_channel
->band
;
2289 struct ieee80211_tx_rate_control txrc
;
2293 sdata
= vif_to_sdata(vif
);
2295 if (!ieee80211_sdata_running(sdata
))
2303 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2305 beacon
= rcu_dereference(ap
->beacon
);
2308 * headroom, head length,
2309 * tail length and maximum TIM length
2311 skb
= dev_alloc_skb(local
->tx_headroom
+
2313 beacon
->tail_len
+ 256);
2317 skb_reserve(skb
, local
->tx_headroom
);
2318 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2322 * Not very nice, but we want to allow the driver to call
2323 * ieee80211_beacon_get() as a response to the set_tim()
2324 * callback. That, however, is already invoked under the
2325 * sta_lock to guarantee consistent and race-free update
2326 * of the tim bitmap in mac80211 and the driver.
2328 if (local
->tim_in_locked_section
) {
2329 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2332 unsigned long flags
;
2334 spin_lock_irqsave(&local
->tim_lock
, flags
);
2335 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2337 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
2341 *tim_offset
= beacon
->head_len
;
2343 *tim_length
= skb
->len
- beacon
->head_len
;
2346 memcpy(skb_put(skb
, beacon
->tail_len
),
2347 beacon
->tail
, beacon
->tail_len
);
2350 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2351 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2352 struct ieee80211_hdr
*hdr
;
2353 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2358 skb
= skb_copy(presp
, GFP_ATOMIC
);
2362 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2363 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2364 IEEE80211_STYPE_BEACON
);
2365 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2366 struct ieee80211_mgmt
*mgmt
;
2367 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2369 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2370 sizeof(mgmt
->u
.beacon
);
2372 #ifdef CONFIG_MAC80211_MESH
2373 if (!sdata
->u
.mesh
.mesh_id_len
)
2377 if (ifmsh
->sync_ops
)
2378 ifmsh
->sync_ops
->adjust_tbtt(
2381 skb
= dev_alloc_skb(local
->tx_headroom
+
2384 2 + 8 + /* supported rates */
2385 2 + 3 + /* DS params */
2386 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2387 2 + sizeof(struct ieee80211_ht_cap
) +
2388 2 + sizeof(struct ieee80211_ht_operation
) +
2389 2 + sdata
->u
.mesh
.mesh_id_len
+
2390 2 + sizeof(struct ieee80211_meshconf_ie
) +
2391 sdata
->u
.mesh
.ie_len
);
2395 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2396 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2397 memset(mgmt
, 0, hdr_len
);
2398 mgmt
->frame_control
=
2399 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2400 eth_broadcast_addr(mgmt
->da
);
2401 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2402 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2403 mgmt
->u
.beacon
.beacon_int
=
2404 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2405 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2406 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2408 pos
= skb_put(skb
, 2);
2409 *pos
++ = WLAN_EID_SSID
;
2412 if (ieee80211_add_srates_ie(sdata
, skb
, true, band
) ||
2413 mesh_add_ds_params_ie(skb
, sdata
) ||
2414 ieee80211_add_ext_srates_ie(sdata
, skb
, true, band
) ||
2415 mesh_add_rsn_ie(skb
, sdata
) ||
2416 mesh_add_ht_cap_ie(skb
, sdata
) ||
2417 mesh_add_ht_oper_ie(skb
, sdata
) ||
2418 mesh_add_meshid_ie(skb
, sdata
) ||
2419 mesh_add_meshconf_ie(skb
, sdata
) ||
2420 mesh_add_vendor_ies(skb
, sdata
)) {
2421 pr_err("o11s: couldn't add ies!\n");
2429 info
= IEEE80211_SKB_CB(skb
);
2431 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2432 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2435 memset(&txrc
, 0, sizeof(txrc
));
2437 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2438 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2440 txrc
.reported_rate
.idx
= -1;
2441 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2442 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2443 txrc
.max_rate_idx
= -1;
2445 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2446 memcpy(txrc
.rate_idx_mcs_mask
, sdata
->rc_rateidx_mcs_mask
[band
],
2447 sizeof(txrc
.rate_idx_mcs_mask
));
2449 rate_control_get_rate(sdata
, NULL
, &txrc
);
2451 info
->control
.vif
= vif
;
2453 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2454 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2455 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2460 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2462 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2463 struct ieee80211_vif
*vif
)
2465 struct ieee80211_if_ap
*ap
= NULL
;
2466 struct sk_buff
*skb
= NULL
;
2467 struct probe_resp
*presp
= NULL
;
2468 struct ieee80211_hdr
*hdr
;
2469 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2471 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2477 presp
= rcu_dereference(ap
->probe_resp
);
2481 skb
= dev_alloc_skb(presp
->len
);
2485 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2487 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2488 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2494 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2496 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2497 struct ieee80211_vif
*vif
)
2499 struct ieee80211_sub_if_data
*sdata
;
2500 struct ieee80211_if_managed
*ifmgd
;
2501 struct ieee80211_pspoll
*pspoll
;
2502 struct ieee80211_local
*local
;
2503 struct sk_buff
*skb
;
2505 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2508 sdata
= vif_to_sdata(vif
);
2509 ifmgd
= &sdata
->u
.mgd
;
2510 local
= sdata
->local
;
2512 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2516 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2518 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2519 memset(pspoll
, 0, sizeof(*pspoll
));
2520 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2521 IEEE80211_STYPE_PSPOLL
);
2522 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2524 /* aid in PS-Poll has its two MSBs each set to 1 */
2525 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2527 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2528 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2532 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2534 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2535 struct ieee80211_vif
*vif
)
2537 struct ieee80211_hdr_3addr
*nullfunc
;
2538 struct ieee80211_sub_if_data
*sdata
;
2539 struct ieee80211_if_managed
*ifmgd
;
2540 struct ieee80211_local
*local
;
2541 struct sk_buff
*skb
;
2543 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2546 sdata
= vif_to_sdata(vif
);
2547 ifmgd
= &sdata
->u
.mgd
;
2548 local
= sdata
->local
;
2550 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2554 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2556 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2558 memset(nullfunc
, 0, sizeof(*nullfunc
));
2559 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2560 IEEE80211_STYPE_NULLFUNC
|
2561 IEEE80211_FCTL_TODS
);
2562 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2563 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2564 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2568 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2570 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2571 struct ieee80211_vif
*vif
,
2572 const u8
*ssid
, size_t ssid_len
,
2573 const u8
*ie
, size_t ie_len
)
2575 struct ieee80211_sub_if_data
*sdata
;
2576 struct ieee80211_local
*local
;
2577 struct ieee80211_hdr_3addr
*hdr
;
2578 struct sk_buff
*skb
;
2582 sdata
= vif_to_sdata(vif
);
2583 local
= sdata
->local
;
2584 ie_ssid_len
= 2 + ssid_len
;
2586 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2587 ie_ssid_len
+ ie_len
);
2591 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2593 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2594 memset(hdr
, 0, sizeof(*hdr
));
2595 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2596 IEEE80211_STYPE_PROBE_REQ
);
2597 eth_broadcast_addr(hdr
->addr1
);
2598 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2599 eth_broadcast_addr(hdr
->addr3
);
2601 pos
= skb_put(skb
, ie_ssid_len
);
2602 *pos
++ = WLAN_EID_SSID
;
2605 memcpy(pos
, ssid
, ssid_len
);
2609 pos
= skb_put(skb
, ie_len
);
2610 memcpy(pos
, ie
, ie_len
);
2615 EXPORT_SYMBOL(ieee80211_probereq_get
);
2617 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2618 const void *frame
, size_t frame_len
,
2619 const struct ieee80211_tx_info
*frame_txctl
,
2620 struct ieee80211_rts
*rts
)
2622 const struct ieee80211_hdr
*hdr
= frame
;
2624 rts
->frame_control
=
2625 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2626 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2628 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2629 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2631 EXPORT_SYMBOL(ieee80211_rts_get
);
2633 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2634 const void *frame
, size_t frame_len
,
2635 const struct ieee80211_tx_info
*frame_txctl
,
2636 struct ieee80211_cts
*cts
)
2638 const struct ieee80211_hdr
*hdr
= frame
;
2640 cts
->frame_control
=
2641 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2642 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2643 frame_len
, frame_txctl
);
2644 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2646 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2649 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2650 struct ieee80211_vif
*vif
)
2652 struct ieee80211_local
*local
= hw_to_local(hw
);
2653 struct sk_buff
*skb
= NULL
;
2654 struct ieee80211_tx_data tx
;
2655 struct ieee80211_sub_if_data
*sdata
;
2656 struct ieee80211_if_ap
*bss
= NULL
;
2657 struct beacon_data
*beacon
;
2658 struct ieee80211_tx_info
*info
;
2660 sdata
= vif_to_sdata(vif
);
2664 beacon
= rcu_dereference(bss
->beacon
);
2666 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2669 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2670 goto out
; /* send buffered bc/mc only after DTIM beacon */
2673 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2676 local
->total_ps_buffered
--;
2678 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2679 struct ieee80211_hdr
*hdr
=
2680 (struct ieee80211_hdr
*) skb
->data
;
2681 /* more buffered multicast/broadcast frames ==> set
2682 * MoreData flag in IEEE 802.11 header to inform PS
2684 hdr
->frame_control
|=
2685 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2688 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2690 dev_kfree_skb_any(skb
);
2693 info
= IEEE80211_SKB_CB(skb
);
2695 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2696 info
->band
= local
->oper_channel
->band
;
2698 if (invoke_tx_handlers(&tx
))
2705 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2707 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data
*sdata
,
2708 struct sk_buff
*skb
, int tid
)
2710 int ac
= ieee802_1d_to_ac
[tid
& 7];
2712 skb_set_mac_header(skb
, 0);
2713 skb_set_network_header(skb
, 0);
2714 skb_set_transport_header(skb
, 0);
2716 skb_set_queue_mapping(skb
, ac
);
2717 skb
->priority
= tid
;
2720 * The other path calling ieee80211_xmit is from the tasklet,
2721 * and while we can handle concurrent transmissions locking
2722 * requirements are that we do not come into tx with bhs on.
2725 ieee80211_xmit(sdata
, skb
);