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
[tx
->channel
->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_NUM_BANDS
:
149 /* No matching basic rate found; use highest suitable mandatory
154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
156 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
163 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur
*= 2; /* ACK + SIFS */
170 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
171 txrate
->bitrate
, erp
,
172 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
175 return cpu_to_le16(dur
);
178 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
179 struct net_device
*dev
)
181 return local
== wdev_priv(dev
->ieee80211_ptr
);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
188 struct ieee80211_local
*local
= tx
->local
;
189 struct ieee80211_if_managed
*ifmgd
;
191 /* driver doesn't support power save */
192 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
195 /* hardware does dynamic power save */
196 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
199 /* dynamic power save disabled */
200 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
203 /* we are scanning, don't enable power save */
207 if (!local
->ps_sdata
)
210 /* No point if we're going to suspend */
211 if (local
->quiescing
)
214 /* dynamic ps is supported only in managed mode */
215 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
218 ifmgd
= &tx
->sdata
->u
.mgd
;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: ifmgd->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
234 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
235 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
238 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
239 ieee80211_stop_queues_by_reason(&local
->hw
,
240 IEEE80211_QUEUE_STOP_REASON_PS
);
241 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
242 ieee80211_queue_work(&local
->hw
,
243 &local
->dynamic_ps_disable_work
);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd
->associated
)
250 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
251 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
260 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
261 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
264 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
267 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
269 !ieee80211_is_probe_req(hdr
->frame_control
) &&
270 !ieee80211_is_nullfunc(hdr
->frame_control
))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
287 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
290 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
294 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
296 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
297 if (unlikely(!assoc
&&
298 ieee80211_is_data(hdr
->frame_control
))) {
299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 printk(KERN_DEBUG
"%s: dropped data frame to not "
301 "associated station %pM\n",
302 tx
->sdata
->name
, hdr
->addr1
);
303 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
304 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
307 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
308 ieee80211_is_data(hdr
->frame_control
) &&
309 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
311 * No associated STAs - no need to send multicast
320 /* This function is called whenever the AP is about to exceed the maximum limit
321 * of buffered frames for power saving STAs. This situation should not really
322 * happen often during normal operation, so dropping the oldest buffered packet
323 * from each queue should be OK to make some room for new frames. */
324 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
326 int total
= 0, purged
= 0;
328 struct ieee80211_sub_if_data
*sdata
;
329 struct sta_info
*sta
;
332 * virtual interfaces are protected by RCU
336 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
337 struct ieee80211_if_ap
*ap
;
338 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
341 skb
= skb_dequeue(&ap
->ps_bc_buf
);
346 total
+= skb_queue_len(&ap
->ps_bc_buf
);
350 * Drop one frame from each station from the lowest-priority
351 * AC that has frames at all.
353 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
356 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
357 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
358 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
369 local
->total_ps_buffered
= total
;
370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
371 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
376 static ieee80211_tx_result
377 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
379 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
380 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
383 * broadcast/multicast frame
385 * If any of the associated stations is in power save mode,
386 * the frame is buffered to be sent after DTIM beacon frame.
387 * This is done either by the hardware or us.
390 /* powersaving STAs only in AP/VLAN mode */
394 /* no buffering for ordered frames */
395 if (ieee80211_has_order(hdr
->frame_control
))
398 /* no stations in PS mode */
399 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
402 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
403 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
404 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
406 /* device releases frame after DTIM beacon */
407 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
410 /* buffered in mac80211 */
411 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
412 purge_old_ps_buffers(tx
->local
);
414 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
415 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
416 net_dbg_ratelimited("%s: BC TX buffer full - dropping the oldest frame\n",
419 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
421 tx
->local
->total_ps_buffered
++;
423 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
428 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
431 if (!ieee80211_is_mgmt(fc
))
434 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
437 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
444 static ieee80211_tx_result
445 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
447 struct sta_info
*sta
= tx
->sta
;
448 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
449 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
450 struct ieee80211_local
*local
= tx
->local
;
455 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
456 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
457 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
458 int ac
= skb_get_queue_mapping(tx
->skb
);
460 /* only deauth, disassoc and action are bufferable MMPDUs */
461 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
462 !ieee80211_is_deauth(hdr
->frame_control
) &&
463 !ieee80211_is_disassoc(hdr
->frame_control
) &&
464 !ieee80211_is_action(hdr
->frame_control
)) {
465 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
469 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
470 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer for AC %d\n",
471 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
472 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
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
]);
477 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
478 net_dbg_ratelimited("%s: STA %pM TX buffer for AC %d full - dropping oldest frame\n",
479 tx
->sdata
->name
, sta
->sta
.addr
, ac
);
483 tx
->local
->total_ps_buffered
++;
485 info
->control
.jiffies
= jiffies
;
486 info
->control
.vif
= &tx
->sdata
->vif
;
487 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
488 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
490 if (!timer_pending(&local
->sta_cleanup
))
491 mod_timer(&local
->sta_cleanup
,
492 round_jiffies(jiffies
+
493 STA_INFO_CLEANUP_INTERVAL
));
496 * We queued up some frames, so the TIM bit might
497 * need to be set, recalculate it.
499 sta_info_recalc_tim(sta
);
503 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
504 else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
506 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
507 tx
->sdata
->name
, sta
->sta
.addr
);
509 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
517 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
520 if (tx
->flags
& IEEE80211_TX_UNICAST
)
521 return ieee80211_tx_h_unicast_ps_buf(tx
);
523 return ieee80211_tx_h_multicast_ps_buf(tx
);
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
529 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
531 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
532 tx
->sdata
->control_port_no_encrypt
))
533 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
538 static ieee80211_tx_result debug_noinline
539 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
541 struct ieee80211_key
*key
= NULL
;
542 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
543 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
545 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
547 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
549 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
550 is_multicast_ether_addr(hdr
->addr1
) &&
551 ieee80211_is_robust_mgmt_frame(hdr
) &&
552 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
554 else if (is_multicast_ether_addr(hdr
->addr1
) &&
555 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
557 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
558 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
560 else if (tx
->sdata
->drop_unencrypted
&&
561 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
562 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
563 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
564 (ieee80211_is_action(hdr
->frame_control
) &&
565 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
566 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
572 bool skip_hw
= false;
574 tx
->key
->tx_rx_count
++;
575 /* TODO: add threshold stuff again */
577 switch (tx
->key
->conf
.cipher
) {
578 case WLAN_CIPHER_SUITE_WEP40
:
579 case WLAN_CIPHER_SUITE_WEP104
:
580 case WLAN_CIPHER_SUITE_TKIP
:
581 if (!ieee80211_is_data_present(hdr
->frame_control
))
584 case WLAN_CIPHER_SUITE_CCMP
:
585 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
586 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
590 skip_hw
= (tx
->key
->conf
.flags
&
591 IEEE80211_KEY_FLAG_SW_MGMT
) &&
592 ieee80211_is_mgmt(hdr
->frame_control
);
594 case WLAN_CIPHER_SUITE_AES_CMAC
:
595 if (!ieee80211_is_mgmt(hdr
->frame_control
))
600 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
603 if (!skip_hw
&& tx
->key
&&
604 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
605 info
->control
.hw_key
= &tx
->key
->conf
;
611 static ieee80211_tx_result debug_noinline
612 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
614 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
615 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
616 struct ieee80211_supported_band
*sband
;
617 struct ieee80211_rate
*rate
;
620 bool inval
= false, rts
= false, short_preamble
= false;
621 struct ieee80211_tx_rate_control txrc
;
624 memset(&txrc
, 0, sizeof(txrc
));
626 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
628 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
629 tx
->local
->hw
.wiphy
->frag_threshold
);
631 /* set up the tx rate control struct we give the RC algo */
632 txrc
.hw
= &tx
->local
->hw
;
634 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
636 txrc
.reported_rate
.idx
= -1;
637 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
638 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
639 txrc
.max_rate_idx
= -1;
641 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
642 memcpy(txrc
.rate_idx_mcs_mask
,
643 tx
->sdata
->rc_rateidx_mcs_mask
[tx
->channel
->band
],
644 sizeof(txrc
.rate_idx_mcs_mask
));
645 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
646 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
647 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
649 /* set up RTS protection if desired */
650 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
651 txrc
.rts
= rts
= true;
655 * Use short preamble if the BSS can handle it, but not for
656 * management frames unless we know the receiver can handle
657 * that -- the management frame might be to a station that
658 * just wants a probe response.
660 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
661 (ieee80211_is_data(hdr
->frame_control
) ||
662 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
663 txrc
.short_preamble
= short_preamble
= true;
666 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
669 * Lets not bother rate control if we're associated and cannot
670 * talk to the sta. This should not happen.
672 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
673 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
674 "%s: Dropped data frame as no usable bitrate found while "
675 "scanning and associated. Target station: "
676 "%pM on %d GHz band\n",
677 tx
->sdata
->name
, hdr
->addr1
,
678 tx
->channel
->band
? 5 : 2))
682 * If we're associated with the sta at this point we know we can at
683 * least send the frame at the lowest bit rate.
685 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
687 if (unlikely(info
->control
.rates
[0].idx
< 0))
690 if (txrc
.reported_rate
.idx
< 0) {
691 txrc
.reported_rate
= info
->control
.rates
[0];
692 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
693 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
695 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
697 if (unlikely(!info
->control
.rates
[0].count
))
698 info
->control
.rates
[0].count
= 1;
700 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
701 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
702 info
->control
.rates
[0].count
= 1;
704 if (is_multicast_ether_addr(hdr
->addr1
)) {
706 * XXX: verify the rate is in the basic rateset
712 * set up the RTS/CTS rate as the fastest basic rate
713 * that is not faster than the data rate
715 * XXX: Should this check all retry rates?
717 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
720 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
722 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
723 /* must be a basic rate */
724 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
726 /* must not be faster than the data rate */
727 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
730 if (sband
->bitrates
[baserate
].bitrate
<
731 sband
->bitrates
[i
].bitrate
)
735 info
->control
.rts_cts_rate_idx
= baserate
;
738 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
740 * make sure there's no valid rate following
741 * an invalid one, just in case drivers don't
742 * take the API seriously to stop at -1.
745 info
->control
.rates
[i
].idx
= -1;
748 if (info
->control
.rates
[i
].idx
< 0) {
754 * For now assume MCS is already set up correctly, this
757 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
758 WARN_ON(info
->control
.rates
[i
].idx
> 76);
762 /* set up RTS protection if desired */
764 info
->control
.rates
[i
].flags
|=
765 IEEE80211_TX_RC_USE_RTS_CTS
;
768 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
769 sband
->n_bitrates
)) {
770 info
->control
.rates
[i
].idx
= -1;
774 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
776 /* set up short preamble */
777 if (short_preamble
&&
778 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
779 info
->control
.rates
[i
].flags
|=
780 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
782 /* set up G protection */
783 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
784 rate
->flags
& IEEE80211_RATE_ERP_G
)
785 info
->control
.rates
[i
].flags
|=
786 IEEE80211_TX_RC_USE_CTS_PROTECT
;
792 static ieee80211_tx_result debug_noinline
793 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
795 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
796 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
802 * Packet injection may want to control the sequence
803 * number, if we have no matching interface then we
804 * neither assign one ourselves nor ask the driver to.
806 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
809 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
812 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
815 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
819 * Anything but QoS data that has a sequence number field
820 * (is long enough) gets a sequence number from the global
823 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
824 /* driver should assign sequence number */
825 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
826 /* for pure STA mode without beacons, we can do it */
827 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
828 tx
->sdata
->sequence_number
+= 0x10;
833 * This should be true for injected/management frames only, for
834 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
835 * above since they are not QoS-data frames.
840 /* include per-STA, per-TID sequence counter */
842 qc
= ieee80211_get_qos_ctl(hdr
);
843 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
844 seq
= &tx
->sta
->tid_seq
[tid
];
846 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
848 /* Increase the sequence number. */
849 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
854 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
855 struct sk_buff
*skb
, int hdrlen
,
858 struct ieee80211_local
*local
= tx
->local
;
859 struct ieee80211_tx_info
*info
;
861 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
862 int pos
= hdrlen
+ per_fragm
;
863 int rem
= skb
->len
- hdrlen
- per_fragm
;
865 if (WARN_ON(rem
< 0))
868 /* first fragment was already added to queue by caller */
871 int fraglen
= per_fragm
;
876 tmp
= dev_alloc_skb(local
->tx_headroom
+
878 IEEE80211_ENCRYPT_HEADROOM
+
879 IEEE80211_ENCRYPT_TAILROOM
);
883 __skb_queue_tail(&tx
->skbs
, tmp
);
885 skb_reserve(tmp
, local
->tx_headroom
+
886 IEEE80211_ENCRYPT_HEADROOM
);
887 /* copy control information */
888 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
890 info
= IEEE80211_SKB_CB(tmp
);
891 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
892 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
895 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
897 skb_copy_queue_mapping(tmp
, skb
);
898 tmp
->priority
= skb
->priority
;
901 /* copy header and data */
902 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
903 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
908 /* adjust first fragment's length */
909 skb
->len
= hdrlen
+ per_fragm
;
913 static ieee80211_tx_result debug_noinline
914 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
916 struct sk_buff
*skb
= tx
->skb
;
917 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
918 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
919 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
923 /* no matter what happens, tx->skb moves to tx->skbs */
924 __skb_queue_tail(&tx
->skbs
, skb
);
927 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
930 if (tx
->local
->ops
->set_frag_threshold
)
934 * Warn when submitting a fragmented A-MPDU frame and drop it.
935 * This scenario is handled in ieee80211_tx_prepare but extra
936 * caution taken here as fragmented ampdu may cause Tx stop.
938 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
941 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
943 /* internal error, why isn't DONTFRAG set? */
944 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
948 * Now fragment the frame. This will allocate all the fragments and
949 * chain them (using skb as the first fragment) to skb->next.
950 * During transmission, we will remove the successfully transmitted
951 * fragments from this list. When the low-level driver rejects one
952 * of the fragments then we will simply pretend to accept the skb
953 * but store it away as pending.
955 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
958 /* update duration/seq/flags of fragments */
961 skb_queue_walk(&tx
->skbs
, skb
) {
963 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
965 hdr
= (void *)skb
->data
;
966 info
= IEEE80211_SKB_CB(skb
);
968 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
969 hdr
->frame_control
|= morefrags
;
971 * No multi-rate retries for fragmented frames, that
972 * would completely throw off the NAV at other STAs.
974 info
->control
.rates
[1].idx
= -1;
975 info
->control
.rates
[2].idx
= -1;
976 info
->control
.rates
[3].idx
= -1;
977 info
->control
.rates
[4].idx
= -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
979 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
981 hdr
->frame_control
&= ~morefrags
;
984 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
991 static ieee80211_tx_result debug_noinline
992 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
999 tx
->sta
->tx_packets
++;
1000 skb_queue_walk(&tx
->skbs
, skb
) {
1001 tx
->sta
->tx_fragments
++;
1002 tx
->sta
->tx_bytes
+= skb
->len
;
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1014 switch (tx
->key
->conf
.cipher
) {
1015 case WLAN_CIPHER_SUITE_WEP40
:
1016 case WLAN_CIPHER_SUITE_WEP104
:
1017 return ieee80211_crypto_wep_encrypt(tx
);
1018 case WLAN_CIPHER_SUITE_TKIP
:
1019 return ieee80211_crypto_tkip_encrypt(tx
);
1020 case WLAN_CIPHER_SUITE_CCMP
:
1021 return ieee80211_crypto_ccmp_encrypt(tx
);
1022 case WLAN_CIPHER_SUITE_AES_CMAC
:
1023 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1025 return ieee80211_crypto_hw_encrypt(tx
);
1031 static ieee80211_tx_result debug_noinline
1032 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1034 struct sk_buff
*skb
;
1035 struct ieee80211_hdr
*hdr
;
1039 skb_queue_walk(&tx
->skbs
, skb
) {
1040 hdr
= (void *) skb
->data
;
1041 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1042 break; /* must not overwrite AID */
1043 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1044 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1045 next_len
= next
->len
;
1048 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1051 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1057 /* actual transmit path */
1059 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1060 struct sk_buff
*skb
,
1061 struct ieee80211_tx_info
*info
,
1062 struct tid_ampdu_tx
*tid_tx
,
1065 bool queued
= false;
1066 bool reset_agg_timer
= false;
1067 struct sk_buff
*purge_skb
= NULL
;
1069 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1070 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1071 reset_agg_timer
= true;
1072 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1074 * nothing -- this aggregation session is being started
1075 * but that might still fail with the driver
1078 spin_lock(&tx
->sta
->lock
);
1080 * Need to re-check now, because we may get here
1082 * 1) in the window during which the setup is actually
1083 * already done, but not marked yet because not all
1084 * packets are spliced over to the driver pending
1085 * queue yet -- if this happened we acquire the lock
1086 * either before or after the splice happens, but
1087 * need to recheck which of these cases happened.
1089 * 2) during session teardown, if the OPERATIONAL bit
1090 * was cleared due to the teardown but the pointer
1091 * hasn't been assigned NULL yet (or we loaded it
1092 * before it was assigned) -- in this case it may
1093 * now be NULL which means we should just let the
1094 * packet pass through because splicing the frames
1095 * back is already done.
1097 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1100 /* do nothing, let packet pass through */
1101 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1102 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1103 reset_agg_timer
= true;
1106 info
->control
.vif
= &tx
->sdata
->vif
;
1107 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1108 __skb_queue_tail(&tid_tx
->pending
, skb
);
1109 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1110 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1112 spin_unlock(&tx
->sta
->lock
);
1115 dev_kfree_skb(purge_skb
);
1118 /* reset session timer */
1119 if (reset_agg_timer
&& tid_tx
->timeout
)
1120 tid_tx
->last_tx
= jiffies
;
1128 static ieee80211_tx_result
1129 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1130 struct ieee80211_tx_data
*tx
,
1131 struct sk_buff
*skb
)
1133 struct ieee80211_local
*local
= sdata
->local
;
1134 struct ieee80211_hdr
*hdr
;
1135 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1139 memset(tx
, 0, sizeof(*tx
));
1143 tx
->channel
= local
->hw
.conf
.channel
;
1144 __skb_queue_head_init(&tx
->skbs
);
1147 * If this flag is set to true anywhere, and we get here,
1148 * we are doing the needed processing, so remove the flag
1151 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1153 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1155 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1156 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1157 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1159 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1160 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1161 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1164 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1166 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1167 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1168 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1169 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1170 struct tid_ampdu_tx
*tid_tx
;
1172 qc
= ieee80211_get_qos_ctl(hdr
);
1173 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1175 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1179 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1182 if (unlikely(queued
))
1187 if (is_multicast_ether_addr(hdr
->addr1
)) {
1188 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1189 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1191 tx
->flags
|= IEEE80211_TX_UNICAST
;
1193 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1194 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1195 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1196 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1197 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1201 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1202 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1203 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1205 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1210 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1211 struct ieee80211_vif
*vif
,
1212 struct ieee80211_sta
*sta
,
1213 struct sk_buff_head
*skbs
,
1216 struct sk_buff
*skb
, *tmp
;
1217 unsigned long flags
;
1219 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1220 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1221 int q
= info
->hw_queue
;
1223 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1224 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1225 __skb_unlink(skb
, skbs
);
1231 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1232 if (local
->queue_stop_reasons
[q
] ||
1233 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1235 * Since queue is stopped, queue up frames for later
1236 * transmission from the tx-pending tasklet when the
1237 * queue is woken again.
1240 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1242 skb_queue_splice_tail_init(skbs
,
1243 &local
->pending
[q
]);
1245 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1249 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1251 info
->control
.vif
= vif
;
1252 info
->control
.sta
= sta
;
1254 __skb_unlink(skb
, skbs
);
1262 * Returns false if the frame couldn't be transmitted but was queued instead.
1264 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1265 struct sk_buff_head
*skbs
, int led_len
,
1266 struct sta_info
*sta
, bool txpending
)
1268 struct ieee80211_tx_info
*info
;
1269 struct ieee80211_sub_if_data
*sdata
;
1270 struct ieee80211_vif
*vif
;
1271 struct ieee80211_sta
*pubsta
;
1272 struct sk_buff
*skb
;
1276 if (WARN_ON(skb_queue_empty(skbs
)))
1279 skb
= skb_peek(skbs
);
1280 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1281 info
= IEEE80211_SKB_CB(skb
);
1282 sdata
= vif_to_sdata(info
->control
.vif
);
1283 if (sta
&& !sta
->uploaded
)
1291 switch (sdata
->vif
.type
) {
1292 case NL80211_IFTYPE_MONITOR
:
1293 sdata
= rcu_dereference(local
->monitor_sdata
);
1297 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1298 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1304 case NL80211_IFTYPE_AP_VLAN
:
1305 sdata
= container_of(sdata
->bss
,
1306 struct ieee80211_sub_if_data
, u
.ap
);
1313 if (local
->ops
->tx_frags
)
1314 drv_tx_frags(local
, vif
, pubsta
, skbs
);
1316 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1319 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1320 ieee80211_led_tx(local
, 1);
1322 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1328 * Invoke TX handlers, return 0 on success and non-zero if the
1329 * frame was dropped or queued.
1331 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1333 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1334 ieee80211_tx_result res
= TX_DROP
;
1336 #define CALL_TXH(txh) \
1339 if (res != TX_CONTINUE) \
1343 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1344 CALL_TXH(ieee80211_tx_h_check_assoc
);
1345 CALL_TXH(ieee80211_tx_h_ps_buf
);
1346 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1347 CALL_TXH(ieee80211_tx_h_select_key
);
1348 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1349 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1351 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1352 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1357 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1358 CALL_TXH(ieee80211_tx_h_sequence
);
1359 CALL_TXH(ieee80211_tx_h_fragment
);
1360 /* handlers after fragment must be aware of tx info fragmentation! */
1361 CALL_TXH(ieee80211_tx_h_stats
);
1362 CALL_TXH(ieee80211_tx_h_encrypt
);
1363 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1364 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1368 if (unlikely(res
== TX_DROP
)) {
1369 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1371 dev_kfree_skb(tx
->skb
);
1373 __skb_queue_purge(&tx
->skbs
);
1375 } else if (unlikely(res
== TX_QUEUED
)) {
1376 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1384 * Returns false if the frame couldn't be transmitted but was queued instead.
1386 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1387 struct sk_buff
*skb
, bool txpending
)
1389 struct ieee80211_local
*local
= sdata
->local
;
1390 struct ieee80211_tx_data tx
;
1391 ieee80211_tx_result res_prepare
;
1392 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1396 if (unlikely(skb
->len
< 10)) {
1403 /* initialises tx */
1405 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1407 if (unlikely(res_prepare
== TX_DROP
)) {
1410 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1414 tx
.channel
= local
->hw
.conf
.channel
;
1415 info
->band
= tx
.channel
->band
;
1417 /* set up hw_queue value early */
1418 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1419 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1421 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1423 if (!invoke_tx_handlers(&tx
))
1424 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1431 /* device xmit handlers */
1433 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1434 struct sk_buff
*skb
,
1435 int head_need
, bool may_encrypt
)
1437 struct ieee80211_local
*local
= sdata
->local
;
1440 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1441 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1442 tail_need
-= skb_tailroom(skb
);
1443 tail_need
= max_t(int, tail_need
, 0);
1446 if (skb_cloned(skb
))
1447 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1448 else if (head_need
|| tail_need
)
1449 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1453 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1454 wiphy_debug(local
->hw
.wiphy
,
1455 "failed to reallocate TX buffer\n");
1462 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1464 struct ieee80211_local
*local
= sdata
->local
;
1465 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1466 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1472 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1474 headroom
= local
->tx_headroom
;
1476 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1477 headroom
-= skb_headroom(skb
);
1478 headroom
= max_t(int, 0, headroom
);
1480 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1486 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1487 info
->control
.vif
= &sdata
->vif
;
1489 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1490 ieee80211_is_data(hdr
->frame_control
) &&
1491 !is_multicast_ether_addr(hdr
->addr1
) &&
1492 mesh_nexthop_resolve(skb
, sdata
)) {
1493 /* skb queued: don't free */
1498 ieee80211_set_qos_hdr(sdata
, skb
);
1499 ieee80211_tx(sdata
, skb
, false);
1503 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1505 struct ieee80211_radiotap_iterator iterator
;
1506 struct ieee80211_radiotap_header
*rthdr
=
1507 (struct ieee80211_radiotap_header
*) skb
->data
;
1508 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1509 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1513 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1514 IEEE80211_TX_CTL_DONTFRAG
;
1517 * for every radiotap entry that is present
1518 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1519 * entries present, or -EINVAL on error)
1523 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1528 /* see if this argument is something we can use */
1529 switch (iterator
.this_arg_index
) {
1531 * You must take care when dereferencing iterator.this_arg
1532 * for multibyte types... the pointer is not aligned. Use
1533 * get_unaligned((type *)iterator.this_arg) to dereference
1534 * iterator.this_arg for type "type" safely on all arches.
1536 case IEEE80211_RADIOTAP_FLAGS
:
1537 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1539 * this indicates that the skb we have been
1540 * handed has the 32-bit FCS CRC at the end...
1541 * we should react to that by snipping it off
1542 * because it will be recomputed and added
1545 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1548 skb_trim(skb
, skb
->len
- FCS_LEN
);
1550 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1551 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1552 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1553 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1556 case IEEE80211_RADIOTAP_TX_FLAGS
:
1557 txflags
= get_unaligned_le16(iterator
.this_arg
);
1558 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1559 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1563 * Please update the file
1564 * Documentation/networking/mac80211-injection.txt
1565 * when parsing new fields here.
1573 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1577 * remove the radiotap header
1578 * iterator->_max_length was sanity-checked against
1579 * skb->len by iterator init
1581 skb_pull(skb
, iterator
._max_length
);
1586 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1587 struct net_device
*dev
)
1589 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1590 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1591 struct ieee80211_radiotap_header
*prthdr
=
1592 (struct ieee80211_radiotap_header
*)skb
->data
;
1593 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1594 struct ieee80211_hdr
*hdr
;
1595 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1600 * Frame injection is not allowed if beaconing is not allowed
1601 * or if we need radar detection. Beaconing is usually not allowed when
1602 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1603 * Passive scan is also used in world regulatory domains where
1604 * your country is not known and as such it should be treated as
1605 * NO TX unless the channel is explicitly allowed in which case
1606 * your current regulatory domain would not have the passive scan
1609 * Since AP mode uses monitor interfaces to inject/TX management
1610 * frames we can make AP mode the exception to this rule once it
1611 * supports radar detection as its implementation can deal with
1612 * radar detection by itself. We can do that later by adding a
1613 * monitor flag interfaces used for AP support.
1615 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1616 IEEE80211_CHAN_PASSIVE_SCAN
)))
1619 /* check for not even having the fixed radiotap header part */
1620 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1621 goto fail
; /* too short to be possibly valid */
1623 /* is it a header version we can trust to find length from? */
1624 if (unlikely(prthdr
->it_version
))
1625 goto fail
; /* only version 0 is supported */
1627 /* then there must be a radiotap header with a length we can use */
1628 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1630 /* does the skb contain enough to deliver on the alleged length? */
1631 if (unlikely(skb
->len
< len_rthdr
))
1632 goto fail
; /* skb too short for claimed rt header extent */
1635 * fix up the pointers accounting for the radiotap
1636 * header still being in there. We are being given
1637 * a precooked IEEE80211 header so no need for
1640 skb_set_mac_header(skb
, len_rthdr
);
1642 * these are just fixed to the end of the rt area since we
1643 * don't have any better information and at this point, nobody cares
1645 skb_set_network_header(skb
, len_rthdr
);
1646 skb_set_transport_header(skb
, len_rthdr
);
1648 if (skb
->len
< len_rthdr
+ 2)
1651 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1652 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1654 if (skb
->len
< len_rthdr
+ hdrlen
)
1658 * Initialize skb->protocol if the injected frame is a data frame
1659 * carrying a rfc1042 header
1661 if (ieee80211_is_data(hdr
->frame_control
) &&
1662 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1663 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1665 if (ether_addr_equal(payload
, rfc1042_header
))
1666 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1670 memset(info
, 0, sizeof(*info
));
1672 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1673 IEEE80211_TX_CTL_INJECTED
;
1675 /* process and remove the injection radiotap header */
1676 if (!ieee80211_parse_tx_radiotap(skb
))
1682 * We process outgoing injected frames that have a local address
1683 * we handle as though they are non-injected frames.
1684 * This code here isn't entirely correct, the local MAC address
1685 * isn't always enough to find the interface to use; for proper
1686 * VLAN/WDS support we will need a different mechanism (which
1687 * likely isn't going to be monitor interfaces).
1689 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1691 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1692 if (!ieee80211_sdata_running(tmp_sdata
))
1694 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1695 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1696 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1698 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1704 ieee80211_xmit(sdata
, skb
);
1707 return NETDEV_TX_OK
;
1711 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1715 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1716 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1717 * @skb: packet to be sent
1718 * @dev: incoming interface
1720 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1721 * not be freed, and caller is responsible for either retrying later or freeing
1724 * This function takes in an Ethernet header and encapsulates it with suitable
1725 * IEEE 802.11 header based on which interface the packet is coming in. The
1726 * encapsulated packet will then be passed to master interface, wlan#.11, for
1727 * transmission (through low-level driver).
1729 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1730 struct net_device
*dev
)
1732 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1733 struct ieee80211_local
*local
= sdata
->local
;
1734 struct ieee80211_tx_info
*info
;
1735 int ret
= NETDEV_TX_BUSY
, head_need
;
1736 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1738 struct ieee80211_hdr hdr
;
1739 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1740 struct mesh_path __maybe_unused
*mppath
= NULL
;
1741 const u8
*encaps_data
;
1742 int encaps_len
, skip_header_bytes
;
1744 struct sta_info
*sta
= NULL
;
1745 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1746 bool tdls_direct
= false;
1751 if (unlikely(skb
->len
< ETH_HLEN
)) {
1756 /* convert Ethernet header to proper 802.11 header (based on
1757 * operation mode) */
1758 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1759 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1761 switch (sdata
->vif
.type
) {
1762 case NL80211_IFTYPE_AP_VLAN
:
1764 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1766 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1768 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1769 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1770 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1771 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1773 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1774 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1780 case NL80211_IFTYPE_AP
:
1781 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1783 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1784 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1785 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1788 case NL80211_IFTYPE_WDS
:
1789 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1791 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1792 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1793 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1794 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1797 #ifdef CONFIG_MAC80211_MESH
1798 case NL80211_IFTYPE_MESH_POINT
:
1799 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1800 /* Do not send frames with mesh_ttl == 0 */
1801 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1806 if (!is_multicast_ether_addr(skb
->data
))
1807 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1810 * Use address extension if it is a packet from
1811 * another interface or if we know the destination
1812 * is being proxied by a portal (i.e. portal address
1813 * differs from proxied address)
1815 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1816 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1817 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1818 skb
->data
, skb
->data
+ ETH_ALEN
);
1820 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1823 int is_mesh_mcast
= 1;
1826 if (is_multicast_ether_addr(skb
->data
))
1827 /* DA TA mSA AE:SA */
1828 mesh_da
= skb
->data
;
1830 static const u8 bcast
[ETH_ALEN
] =
1831 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1833 /* RA TA mDA mSA AE:DA SA */
1834 mesh_da
= mppath
->mpp
;
1837 /* DA TA mSA AE:SA */
1841 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1842 mesh_da
, sdata
->vif
.addr
);
1846 ieee80211_new_mesh_header(&mesh_hdr
,
1848 skb
->data
+ ETH_ALEN
,
1852 ieee80211_new_mesh_header(&mesh_hdr
,
1855 skb
->data
+ ETH_ALEN
);
1860 case NL80211_IFTYPE_STATION
:
1861 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1862 bool tdls_peer
= false;
1865 sta
= sta_info_get(sdata
, skb
->data
);
1867 authorized
= test_sta_flag(sta
,
1868 WLAN_STA_AUTHORIZED
);
1869 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1870 tdls_peer
= test_sta_flag(sta
,
1871 WLAN_STA_TDLS_PEER
);
1872 tdls_auth
= test_sta_flag(sta
,
1873 WLAN_STA_TDLS_PEER_AUTH
);
1878 * If the TDLS link is enabled, send everything
1879 * directly. Otherwise, allow TDLS setup frames
1880 * to be transmitted indirectly.
1882 tdls_direct
= tdls_peer
&& (tdls_auth
||
1883 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1884 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1888 /* link during setup - throw out frames to peer */
1895 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1896 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1897 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1899 } else if (sdata
->u
.mgd
.use_4addr
&&
1900 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1901 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1902 IEEE80211_FCTL_TODS
);
1904 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1905 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1906 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1907 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1910 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1912 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1913 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1914 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
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
);
1931 * There's no need to try to look up the destination
1932 * if it is a multicast address (which can only happen
1935 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1938 sta
= sta_info_get(sdata
, hdr
.addr1
);
1940 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1941 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1946 /* For mesh, the use of the QoS header is mandatory */
1947 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1950 /* receiver and we are QoS enabled, use a QoS type frame */
1951 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1952 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1957 * Drop unicast frames to unauthorised stations unless they are
1958 * EAPOL frames from the local station.
1960 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1961 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1962 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1963 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1964 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1965 net_dbg_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1966 dev
->name
, hdr
.addr1
);
1969 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 r
= idr_get_new_above(&local
->ack_status_frames
,
1988 idr_pre_get(&local
->ack_status_frames
,
1990 r
= idr_get_new_above(&local
->ack_status_frames
,
1993 if (WARN_ON(!id
) || id
> 0xffff) {
1994 idr_remove(&local
->ack_status_frames
, id
);
1997 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2001 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2002 } else if (skb_shared(skb
)) {
2003 kfree_skb(orig_skb
);
2009 /* couldn't clone -- lose tx status ... */
2015 * If the skb is shared we need to obtain our own copy.
2017 if (skb_shared(skb
)) {
2018 struct sk_buff
*tmp_skb
= skb
;
2020 /* can't happen -- skb is a clone if info_id != 0 */
2023 skb
= skb_clone(skb
, GFP_ATOMIC
);
2032 hdr
.frame_control
= fc
;
2033 hdr
.duration_id
= 0;
2036 skip_header_bytes
= ETH_HLEN
;
2037 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2038 encaps_data
= bridge_tunnel_header
;
2039 encaps_len
= sizeof(bridge_tunnel_header
);
2040 skip_header_bytes
-= 2;
2041 } else if (ethertype
>= 0x600) {
2042 encaps_data
= rfc1042_header
;
2043 encaps_len
= sizeof(rfc1042_header
);
2044 skip_header_bytes
-= 2;
2050 nh_pos
= skb_network_header(skb
) - skb
->data
;
2051 h_pos
= skb_transport_header(skb
) - skb
->data
;
2053 skb_pull(skb
, skip_header_bytes
);
2054 nh_pos
-= skip_header_bytes
;
2055 h_pos
-= skip_header_bytes
;
2057 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2060 * So we need to modify the skb header and hence need a copy of
2061 * that. The head_need variable above doesn't, so far, include
2062 * the needed header space that we don't need right away. If we
2063 * can, then we don't reallocate right now but only after the
2064 * frame arrives at the master device (if it does...)
2066 * If we cannot, however, then we will reallocate to include all
2067 * the ever needed space. Also, if we need to reallocate it anyway,
2068 * make it big enough for everything we may ever need.
2071 if (head_need
> 0 || skb_cloned(skb
)) {
2072 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2073 head_need
+= local
->tx_headroom
;
2074 head_need
= max_t(int, 0, head_need
);
2075 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2080 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2081 nh_pos
+= encaps_len
;
2082 h_pos
+= encaps_len
;
2085 #ifdef CONFIG_MAC80211_MESH
2086 if (meshhdrlen
> 0) {
2087 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2088 nh_pos
+= meshhdrlen
;
2089 h_pos
+= meshhdrlen
;
2093 if (ieee80211_is_data_qos(fc
)) {
2094 __le16
*qos_control
;
2096 qos_control
= (__le16
*) skb_push(skb
, 2);
2097 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2099 * Maybe we could actually set some fields here, for now just
2100 * initialise to zero to indicate no special operation.
2104 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2109 dev
->stats
.tx_packets
++;
2110 dev
->stats
.tx_bytes
+= skb
->len
;
2112 /* Update skb pointers to various headers since this modified frame
2113 * is going to go through Linux networking code that may potentially
2114 * need things like pointer to IP header. */
2115 skb_set_mac_header(skb
, 0);
2116 skb_set_network_header(skb
, nh_pos
);
2117 skb_set_transport_header(skb
, h_pos
);
2119 info
= IEEE80211_SKB_CB(skb
);
2120 memset(info
, 0, sizeof(*info
));
2122 dev
->trans_start
= jiffies
;
2124 info
->flags
= info_flags
;
2125 info
->ack_frame_id
= info_id
;
2127 ieee80211_xmit(sdata
, skb
);
2129 return NETDEV_TX_OK
;
2132 if (ret
== NETDEV_TX_OK
)
2140 * ieee80211_clear_tx_pending may not be called in a context where
2141 * it is possible that it packets could come in again.
2143 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2147 for (i
= 0; i
< local
->hw
.queues
; i
++)
2148 skb_queue_purge(&local
->pending
[i
]);
2152 * Returns false if the frame couldn't be transmitted but was queued instead,
2153 * which in this case means re-queued -- take as an indication to stop sending
2154 * more pending frames.
2156 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2157 struct sk_buff
*skb
)
2159 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2160 struct ieee80211_sub_if_data
*sdata
;
2161 struct sta_info
*sta
;
2162 struct ieee80211_hdr
*hdr
;
2165 sdata
= vif_to_sdata(info
->control
.vif
);
2167 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2168 result
= ieee80211_tx(sdata
, skb
, true);
2170 struct sk_buff_head skbs
;
2172 __skb_queue_head_init(&skbs
);
2173 __skb_queue_tail(&skbs
, skb
);
2175 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2176 sta
= sta_info_get(sdata
, hdr
->addr1
);
2178 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2185 * Transmit all pending packets. Called from tasklet.
2187 void ieee80211_tx_pending(unsigned long data
)
2189 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2190 unsigned long flags
;
2196 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2197 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2199 * If queue is stopped by something other than due to pending
2200 * frames, or we have no pending frames, proceed to next queue.
2202 if (local
->queue_stop_reasons
[i
] ||
2203 skb_queue_empty(&local
->pending
[i
]))
2206 while (!skb_queue_empty(&local
->pending
[i
])) {
2207 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2208 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2210 if (WARN_ON(!info
->control
.vif
)) {
2215 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2218 txok
= ieee80211_tx_pending_skb(local
, skb
);
2219 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2225 if (skb_queue_empty(&local
->pending
[i
]))
2226 ieee80211_propagate_queue_wake(local
, i
);
2228 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2233 /* functions for drivers to get certain frames */
2235 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2236 struct ieee80211_if_ap
*bss
,
2237 struct sk_buff
*skb
,
2238 struct beacon_data
*beacon
)
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(&bss
->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*)bss
->tim
,
2250 IEEE80211_MAX_AID
+1);
2252 if (bss
->dtim_count
== 0)
2253 bss
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2257 tim
= pos
= (u8
*) skb_put(skb
, 6);
2258 *pos
++ = WLAN_EID_TIM
;
2260 *pos
++ = bss
->dtim_count
;
2261 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2263 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2266 bss
->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
, bss
->tim
+ n1
, n2
- n1
+ 1);
2293 tim
[1] = n2
- n1
+ 4;
2295 *pos
++ = aid0
; /* Bitmap control */
2296 *pos
++ = 0; /* Part Virt Bitmap */
2300 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2301 struct ieee80211_vif
*vif
,
2302 u16
*tim_offset
, u16
*tim_length
)
2304 struct ieee80211_local
*local
= hw_to_local(hw
);
2305 struct sk_buff
*skb
= NULL
;
2306 struct ieee80211_tx_info
*info
;
2307 struct ieee80211_sub_if_data
*sdata
= NULL
;
2308 struct ieee80211_if_ap
*ap
= NULL
;
2309 struct beacon_data
*beacon
;
2310 struct ieee80211_supported_band
*sband
;
2311 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2312 struct ieee80211_tx_rate_control txrc
;
2314 sband
= local
->hw
.wiphy
->bands
[band
];
2318 sdata
= vif_to_sdata(vif
);
2320 if (!ieee80211_sdata_running(sdata
))
2328 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2330 beacon
= rcu_dereference(ap
->beacon
);
2333 * headroom, head length,
2334 * tail length and maximum TIM length
2336 skb
= dev_alloc_skb(local
->tx_headroom
+
2338 beacon
->tail_len
+ 256);
2342 skb_reserve(skb
, local
->tx_headroom
);
2343 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2347 * Not very nice, but we want to allow the driver to call
2348 * ieee80211_beacon_get() as a response to the set_tim()
2349 * callback. That, however, is already invoked under the
2350 * sta_lock to guarantee consistent and race-free update
2351 * of the tim bitmap in mac80211 and the driver.
2353 if (local
->tim_in_locked_section
) {
2354 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2357 unsigned long flags
;
2359 spin_lock_irqsave(&local
->tim_lock
, flags
);
2360 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2362 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
2366 *tim_offset
= beacon
->head_len
;
2368 *tim_length
= skb
->len
- beacon
->head_len
;
2371 memcpy(skb_put(skb
, beacon
->tail_len
),
2372 beacon
->tail
, beacon
->tail_len
);
2375 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2376 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2377 struct ieee80211_hdr
*hdr
;
2378 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2383 skb
= skb_copy(presp
, GFP_ATOMIC
);
2387 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2388 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2389 IEEE80211_STYPE_BEACON
);
2390 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2391 struct ieee80211_mgmt
*mgmt
;
2392 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2394 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2395 sizeof(mgmt
->u
.beacon
);
2397 #ifdef CONFIG_MAC80211_MESH
2398 if (!sdata
->u
.mesh
.mesh_id_len
)
2402 if (ifmsh
->sync_ops
)
2403 ifmsh
->sync_ops
->adjust_tbtt(
2406 skb
= dev_alloc_skb(local
->tx_headroom
+
2409 2 + 8 + /* supported rates */
2410 2 + 3 + /* DS params */
2411 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2412 2 + sizeof(struct ieee80211_ht_cap
) +
2413 2 + sizeof(struct ieee80211_ht_operation
) +
2414 2 + sdata
->u
.mesh
.mesh_id_len
+
2415 2 + sizeof(struct ieee80211_meshconf_ie
) +
2416 sdata
->u
.mesh
.ie_len
);
2420 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2421 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2422 memset(mgmt
, 0, hdr_len
);
2423 mgmt
->frame_control
=
2424 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2425 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2426 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2427 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2428 mgmt
->u
.beacon
.beacon_int
=
2429 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2430 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2431 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2433 pos
= skb_put(skb
, 2);
2434 *pos
++ = WLAN_EID_SSID
;
2437 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
, true) ||
2438 mesh_add_ds_params_ie(skb
, sdata
) ||
2439 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
, true) ||
2440 mesh_add_rsn_ie(skb
, sdata
) ||
2441 mesh_add_ht_cap_ie(skb
, sdata
) ||
2442 mesh_add_ht_oper_ie(skb
, sdata
) ||
2443 mesh_add_meshid_ie(skb
, sdata
) ||
2444 mesh_add_meshconf_ie(skb
, sdata
) ||
2445 mesh_add_vendor_ies(skb
, sdata
)) {
2446 pr_err("o11s: couldn't add ies!\n");
2454 info
= IEEE80211_SKB_CB(skb
);
2456 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2457 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2460 memset(&txrc
, 0, sizeof(txrc
));
2463 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2465 txrc
.reported_rate
.idx
= -1;
2466 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2467 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2468 txrc
.max_rate_idx
= -1;
2470 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2471 memcpy(txrc
.rate_idx_mcs_mask
, sdata
->rc_rateidx_mcs_mask
[band
],
2472 sizeof(txrc
.rate_idx_mcs_mask
));
2474 rate_control_get_rate(sdata
, NULL
, &txrc
);
2476 info
->control
.vif
= vif
;
2478 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2479 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2480 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2485 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2487 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2488 struct ieee80211_vif
*vif
)
2490 struct ieee80211_if_ap
*ap
= NULL
;
2491 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2492 struct ieee80211_hdr
*hdr
;
2493 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2495 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2501 presp
= rcu_dereference(ap
->probe_resp
);
2505 skb
= skb_copy(presp
, GFP_ATOMIC
);
2509 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2510 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2516 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2518 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2519 struct ieee80211_vif
*vif
)
2521 struct ieee80211_sub_if_data
*sdata
;
2522 struct ieee80211_if_managed
*ifmgd
;
2523 struct ieee80211_pspoll
*pspoll
;
2524 struct ieee80211_local
*local
;
2525 struct sk_buff
*skb
;
2527 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2530 sdata
= vif_to_sdata(vif
);
2531 ifmgd
= &sdata
->u
.mgd
;
2532 local
= sdata
->local
;
2534 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2538 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2540 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2541 memset(pspoll
, 0, sizeof(*pspoll
));
2542 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2543 IEEE80211_STYPE_PSPOLL
);
2544 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2546 /* aid in PS-Poll has its two MSBs each set to 1 */
2547 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2549 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2550 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2554 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2556 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2557 struct ieee80211_vif
*vif
)
2559 struct ieee80211_hdr_3addr
*nullfunc
;
2560 struct ieee80211_sub_if_data
*sdata
;
2561 struct ieee80211_if_managed
*ifmgd
;
2562 struct ieee80211_local
*local
;
2563 struct sk_buff
*skb
;
2565 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2568 sdata
= vif_to_sdata(vif
);
2569 ifmgd
= &sdata
->u
.mgd
;
2570 local
= sdata
->local
;
2572 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2576 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2578 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2580 memset(nullfunc
, 0, sizeof(*nullfunc
));
2581 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2582 IEEE80211_STYPE_NULLFUNC
|
2583 IEEE80211_FCTL_TODS
);
2584 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2585 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2586 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2590 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2592 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2593 struct ieee80211_vif
*vif
,
2594 const u8
*ssid
, size_t ssid_len
,
2595 const u8
*ie
, size_t ie_len
)
2597 struct ieee80211_sub_if_data
*sdata
;
2598 struct ieee80211_local
*local
;
2599 struct ieee80211_hdr_3addr
*hdr
;
2600 struct sk_buff
*skb
;
2604 sdata
= vif_to_sdata(vif
);
2605 local
= sdata
->local
;
2606 ie_ssid_len
= 2 + ssid_len
;
2608 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2609 ie_ssid_len
+ ie_len
);
2613 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2615 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2616 memset(hdr
, 0, sizeof(*hdr
));
2617 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2618 IEEE80211_STYPE_PROBE_REQ
);
2619 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2620 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2621 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2623 pos
= skb_put(skb
, ie_ssid_len
);
2624 *pos
++ = WLAN_EID_SSID
;
2627 memcpy(pos
, ssid
, ssid_len
);
2631 pos
= skb_put(skb
, ie_len
);
2632 memcpy(pos
, ie
, ie_len
);
2637 EXPORT_SYMBOL(ieee80211_probereq_get
);
2639 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2640 const void *frame
, size_t frame_len
,
2641 const struct ieee80211_tx_info
*frame_txctl
,
2642 struct ieee80211_rts
*rts
)
2644 const struct ieee80211_hdr
*hdr
= frame
;
2646 rts
->frame_control
=
2647 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2648 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2650 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2651 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2653 EXPORT_SYMBOL(ieee80211_rts_get
);
2655 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2656 const void *frame
, size_t frame_len
,
2657 const struct ieee80211_tx_info
*frame_txctl
,
2658 struct ieee80211_cts
*cts
)
2660 const struct ieee80211_hdr
*hdr
= frame
;
2662 cts
->frame_control
=
2663 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2664 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2665 frame_len
, frame_txctl
);
2666 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2668 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2671 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2672 struct ieee80211_vif
*vif
)
2674 struct ieee80211_local
*local
= hw_to_local(hw
);
2675 struct sk_buff
*skb
= NULL
;
2676 struct ieee80211_tx_data tx
;
2677 struct ieee80211_sub_if_data
*sdata
;
2678 struct ieee80211_if_ap
*bss
= NULL
;
2679 struct beacon_data
*beacon
;
2680 struct ieee80211_tx_info
*info
;
2682 sdata
= vif_to_sdata(vif
);
2686 beacon
= rcu_dereference(bss
->beacon
);
2688 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2691 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2692 goto out
; /* send buffered bc/mc only after DTIM beacon */
2695 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2698 local
->total_ps_buffered
--;
2700 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2701 struct ieee80211_hdr
*hdr
=
2702 (struct ieee80211_hdr
*) skb
->data
;
2703 /* more buffered multicast/broadcast frames ==> set
2704 * MoreData flag in IEEE 802.11 header to inform PS
2706 hdr
->frame_control
|=
2707 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2710 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2712 dev_kfree_skb_any(skb
);
2715 info
= IEEE80211_SKB_CB(skb
);
2717 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2718 tx
.channel
= local
->hw
.conf
.channel
;
2719 info
->band
= tx
.channel
->band
;
2721 if (invoke_tx_handlers(&tx
))
2728 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2730 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data
*sdata
,
2731 struct sk_buff
*skb
, int tid
)
2733 int ac
= ieee802_1d_to_ac
[tid
];
2735 skb_set_mac_header(skb
, 0);
2736 skb_set_network_header(skb
, 0);
2737 skb_set_transport_header(skb
, 0);
2739 skb_set_queue_mapping(skb
, ac
);
2740 skb
->priority
= tid
;
2743 * The other path calling ieee80211_xmit is from the tasklet,
2744 * and while we can handle concurrent transmissions locking
2745 * requirements are that we do not come into tx with bhs on.
2748 ieee80211_xmit(sdata
, skb
);