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 <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
50 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
51 txrate
= &sband
->bitrates
[tx
->rate_idx
];
54 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
55 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
58 * data and mgmt (except PS Poll):
60 * - during contention period:
61 * if addr1 is group address: 0
62 * if more fragments = 0 and addr1 is individual address: time to
63 * transmit one ACK plus SIFS
64 * if more fragments = 1 and addr1 is individual address: time to
65 * transmit next fragment plus 2 x ACK plus 3 x SIFS
68 * - control response frame (CTS or ACK) shall be transmitted using the
69 * same rate as the immediately previous frame in the frame exchange
70 * sequence, if this rate belongs to the PHY mandatory rates, or else
71 * at the highest possible rate belonging to the PHY rates in the
74 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
75 if (ieee80211_is_ctl(hdr
->frame_control
)) {
76 /* TODO: These control frames are not currently sent by
77 * mac80211, but should they be implemented, this function
78 * needs to be updated to support duration field calculation.
80 * RTS: time needed to transmit pending data/mgmt frame plus
81 * one CTS frame plus one ACK frame plus 3 x SIFS
82 * CTS: duration of immediately previous RTS minus time
83 * required to transmit CTS and its SIFS
84 * ACK: 0 if immediately previous directed data/mgmt had
85 * more=0, with more=1 duration in ACK frame is duration
86 * from previous frame minus time needed to transmit ACK
88 * PS Poll: BIT(15) | BIT(14) | aid
94 if (0 /* FIX: data/mgmt during CFP */)
95 return cpu_to_le16(32768);
97 if (group_addr
) /* Group address as the destination - no ACK */
100 /* Individual destination address:
101 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
102 * CTS and ACK frames shall be transmitted using the highest rate in
103 * basic rate set that is less than or equal to the rate of the
104 * immediately previous frame and that is using the same modulation
105 * (CCK or OFDM). If no basic rate set matches with these requirements,
106 * the highest mandatory rate of the PHY that is less than or equal to
107 * the rate of the previous frame is used.
108 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
111 /* use lowest available if everything fails */
112 mrate
= sband
->bitrates
[0].bitrate
;
113 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
114 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
116 if (r
->bitrate
> txrate
->bitrate
)
119 if (tx
->sdata
->bss_conf
.basic_rates
& BIT(i
))
122 switch (sband
->band
) {
123 case IEEE80211_BAND_2GHZ
: {
125 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
126 flag
= IEEE80211_RATE_MANDATORY_G
;
128 flag
= IEEE80211_RATE_MANDATORY_B
;
133 case IEEE80211_BAND_5GHZ
:
134 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
137 case IEEE80211_NUM_BANDS
:
143 /* No matching basic rate found; use highest suitable mandatory
148 /* Time needed to transmit ACK
149 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
150 * to closest integer */
152 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
153 tx
->sdata
->bss_conf
.use_short_preamble
);
156 /* Frame is fragmented: duration increases with time needed to
157 * transmit next fragment plus ACK and 2 x SIFS. */
158 dur
*= 2; /* ACK + SIFS */
160 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
161 txrate
->bitrate
, erp
,
162 tx
->sdata
->bss_conf
.use_short_preamble
);
165 return cpu_to_le16(dur
);
168 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
169 struct net_device
*dev
)
171 return local
== wdev_priv(dev
->ieee80211_ptr
);
176 static ieee80211_tx_result debug_noinline
177 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
180 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
181 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
184 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
187 if (unlikely(tx
->local
->sw_scanning
) &&
188 !ieee80211_is_probe_req(hdr
->frame_control
))
191 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
194 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
197 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
199 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
200 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
201 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
202 ieee80211_is_data(hdr
->frame_control
))) {
203 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
204 printk(KERN_DEBUG
"%s: dropped data frame to not "
205 "associated station %pM\n",
206 tx
->dev
->name
, hdr
->addr1
);
207 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
208 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
212 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
213 tx
->local
->num_sta
== 0 &&
214 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
216 * No associated STAs - no need to send multicast
227 /* This function is called whenever the AP is about to exceed the maximum limit
228 * of buffered frames for power saving STAs. This situation should not really
229 * happen often during normal operation, so dropping the oldest buffered packet
230 * from each queue should be OK to make some room for new frames. */
231 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
233 int total
= 0, purged
= 0;
235 struct ieee80211_sub_if_data
*sdata
;
236 struct sta_info
*sta
;
239 * virtual interfaces are protected by RCU
243 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
244 struct ieee80211_if_ap
*ap
;
245 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
248 skb
= skb_dequeue(&ap
->ps_bc_buf
);
253 total
+= skb_queue_len(&ap
->ps_bc_buf
);
256 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
257 skb
= skb_dequeue(&sta
->ps_tx_buf
);
262 total
+= skb_queue_len(&sta
->ps_tx_buf
);
267 local
->total_ps_buffered
= total
;
268 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
269 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
270 wiphy_name(local
->hw
.wiphy
), purged
);
274 static ieee80211_tx_result
275 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
277 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
278 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
281 * broadcast/multicast frame
283 * If any of the associated stations is in power save mode,
284 * the frame is buffered to be sent after DTIM beacon frame.
285 * This is done either by the hardware or us.
288 /* powersaving STAs only in AP/VLAN mode */
292 /* no buffering for ordered frames */
293 if (ieee80211_has_order(hdr
->frame_control
))
296 /* no stations in PS mode */
297 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
300 /* buffered in mac80211 */
301 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
302 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
303 purge_old_ps_buffers(tx
->local
);
304 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
306 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
307 if (net_ratelimit()) {
308 printk(KERN_DEBUG
"%s: BC TX buffer full - "
309 "dropping the oldest frame\n",
313 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
315 tx
->local
->total_ps_buffered
++;
316 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
320 /* buffered in hardware */
321 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
326 static ieee80211_tx_result
327 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
329 struct sta_info
*sta
= tx
->sta
;
330 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
331 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
334 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
337 staflags
= get_sta_flags(sta
);
339 if (unlikely((staflags
& WLAN_STA_PS
) &&
340 !(staflags
& WLAN_STA_PSPOLL
))) {
341 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
342 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
344 sta
->sta
.addr
, sta
->sta
.aid
,
345 skb_queue_len(&sta
->ps_tx_buf
));
346 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
347 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
348 purge_old_ps_buffers(tx
->local
);
349 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
350 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
351 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
352 if (net_ratelimit()) {
353 printk(KERN_DEBUG
"%s: STA %pM TX "
354 "buffer full - dropping oldest frame\n",
355 tx
->dev
->name
, sta
->sta
.addr
);
360 tx
->local
->total_ps_buffered
++;
362 /* Queue frame to be sent after STA sends an PS Poll frame */
363 if (skb_queue_empty(&sta
->ps_tx_buf
))
364 sta_info_set_tim_bit(sta
);
366 info
->control
.jiffies
= jiffies
;
367 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
371 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
372 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
373 "set -> send frame\n", tx
->dev
->name
,
376 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
377 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
382 static ieee80211_tx_result debug_noinline
383 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
385 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
388 if (tx
->flags
& IEEE80211_TX_UNICAST
)
389 return ieee80211_tx_h_unicast_ps_buf(tx
);
391 return ieee80211_tx_h_multicast_ps_buf(tx
);
394 static ieee80211_tx_result debug_noinline
395 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
397 struct ieee80211_key
*key
;
398 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
399 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
401 if (unlikely(tx
->skb
->do_not_encrypt
))
403 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
405 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
407 else if (tx
->sdata
->drop_unencrypted
&&
408 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
409 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
410 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
416 tx
->key
->tx_rx_count
++;
417 /* TODO: add threshold stuff again */
419 switch (tx
->key
->conf
.alg
) {
421 if (ieee80211_is_auth(hdr
->frame_control
))
425 if (!ieee80211_is_data_present(hdr
->frame_control
))
431 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
432 tx
->skb
->do_not_encrypt
= 1;
437 static ieee80211_tx_result debug_noinline
438 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
440 struct rate_selection rsel
;
441 struct ieee80211_supported_band
*sband
;
442 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
444 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
446 if (likely(tx
->rate_idx
< 0)) {
447 rate_control_get_rate(tx
->sdata
, sband
, tx
->sta
,
450 tx
->sta
->last_txrate_idx
= rsel
.rate_idx
;
451 tx
->rate_idx
= rsel
.rate_idx
;
452 if (unlikely(rsel
.probe_idx
>= 0)) {
453 info
->flags
|= IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
454 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
455 info
->control
.retries
[0].rate_idx
= tx
->rate_idx
;
456 info
->control
.retries
[0].limit
= tx
->local
->hw
.max_altrate_tries
;
457 tx
->rate_idx
= rsel
.probe_idx
;
458 } else if (info
->control
.retries
[0].limit
== 0)
459 info
->control
.retries
[0].rate_idx
= -1;
461 if (unlikely(tx
->rate_idx
< 0))
464 info
->control
.retries
[0].rate_idx
= -1;
466 if (tx
->sdata
->bss_conf
.use_cts_prot
&&
467 (tx
->flags
& IEEE80211_TX_FRAGMENTED
) && (rsel
.nonerp_idx
>= 0)) {
468 tx
->last_frag_rate_idx
= tx
->rate_idx
;
469 if (rsel
.probe_idx
>= 0)
470 tx
->flags
&= ~IEEE80211_TX_PROBE_LAST_FRAG
;
472 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
473 tx
->rate_idx
= rsel
.nonerp_idx
;
474 info
->tx_rate_idx
= rsel
.nonerp_idx
;
475 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
477 tx
->last_frag_rate_idx
= tx
->rate_idx
;
478 info
->tx_rate_idx
= tx
->rate_idx
;
480 info
->tx_rate_idx
= tx
->rate_idx
;
485 static ieee80211_tx_result debug_noinline
486 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
488 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
489 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
490 struct ieee80211_supported_band
*sband
;
492 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
495 info
->control
.sta
= &tx
->sta
->sta
;
497 if (!info
->control
.retry_limit
) {
498 if (!is_multicast_ether_addr(hdr
->addr1
)) {
499 int len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
500 tx
->local
->fragmentation_threshold
);
501 if (len
> tx
->local
->rts_threshold
502 && tx
->local
->rts_threshold
<
503 IEEE80211_MAX_RTS_THRESHOLD
) {
504 info
->flags
|= IEEE80211_TX_CTL_USE_RTS_CTS
;
506 IEEE80211_TX_CTL_LONG_RETRY_LIMIT
;
507 info
->control
.retry_limit
=
508 tx
->local
->long_retry_limit
;
510 info
->control
.retry_limit
=
511 tx
->local
->short_retry_limit
;
514 info
->control
.retry_limit
= 1;
518 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
519 /* Do not use multiple retry rates when sending fragmented
521 * TODO: The last fragment could still use multiple retry
523 info
->control
.retries
[0].rate_idx
= -1;
526 /* Use CTS protection for unicast frames sent using extended rates if
527 * there are associated non-ERP stations and RTS/CTS is not configured
529 if ((tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
) &&
530 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_ERP_G
) &&
531 (tx
->flags
& IEEE80211_TX_UNICAST
) &&
532 tx
->sdata
->bss_conf
.use_cts_prot
&&
533 !(info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
))
534 info
->flags
|= IEEE80211_TX_CTL_USE_CTS_PROTECT
;
536 /* Transmit data frames using short preambles if the driver supports
537 * short preambles at the selected rate and short preambles are
538 * available on the network at the current point in time. */
539 if (ieee80211_is_data(hdr
->frame_control
) &&
540 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
) &&
541 tx
->sdata
->bss_conf
.use_short_preamble
&&
542 (!tx
->sta
|| test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))) {
543 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
546 if ((info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
) ||
547 (info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)) {
548 struct ieee80211_rate
*rate
;
552 /* Do not use multiple retry rates when using RTS/CTS */
553 info
->control
.retries
[0].rate_idx
= -1;
555 /* Use min(data rate, max base rate) as CTS/RTS rate */
556 rate
= &sband
->bitrates
[tx
->rate_idx
];
558 for (idx
= 0; idx
< sband
->n_bitrates
; idx
++) {
559 if (sband
->bitrates
[idx
].bitrate
> rate
->bitrate
)
561 if (tx
->sdata
->bss_conf
.basic_rates
& BIT(idx
) &&
563 (sband
->bitrates
[baserate
].bitrate
564 < sband
->bitrates
[idx
].bitrate
)))
569 info
->control
.rts_cts_rate_idx
= baserate
;
571 info
->control
.rts_cts_rate_idx
= 0;
575 info
->control
.sta
= &tx
->sta
->sta
;
580 static ieee80211_tx_result debug_noinline
581 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
583 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
584 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
590 * Packet injection may want to control the sequence
591 * number, if we have no matching interface then we
592 * neither assign one ourselves nor ask the driver to.
594 if (unlikely(!info
->control
.vif
))
597 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
600 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
603 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
604 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
609 * This should be true for injected/management frames only, for
610 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
611 * above since they are not QoS-data frames.
616 /* include per-STA, per-TID sequence counter */
618 qc
= ieee80211_get_qos_ctl(hdr
);
619 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
620 seq
= &tx
->sta
->tid_seq
[tid
];
622 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
624 /* Increase the sequence number. */
625 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
630 static ieee80211_tx_result debug_noinline
631 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
633 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
634 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
635 struct sk_buff
**frags
, *first
, *frag
;
639 int frag_threshold
= tx
->local
->fragmentation_threshold
;
641 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
645 * Warn when submitting a fragmented A-MPDU frame and drop it.
646 * This scenario is handled in __ieee80211_tx_prepare but extra
647 * caution taken here as fragmented ampdu may cause Tx stop.
649 if (WARN_ON(tx
->flags
& IEEE80211_TX_CTL_AMPDU
||
650 skb_get_queue_mapping(tx
->skb
) >=
651 ieee80211_num_regular_queues(&tx
->local
->hw
)))
656 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
657 payload_len
= first
->len
- hdrlen
;
658 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
659 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
661 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
665 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
666 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
667 pos
= first
->data
+ hdrlen
+ per_fragm
;
668 left
= payload_len
- per_fragm
;
669 for (i
= 0; i
< num_fragm
- 1; i
++) {
670 struct ieee80211_hdr
*fhdr
;
676 /* reserve enough extra head and tail room for possible
679 dev_alloc_skb(tx
->local
->tx_headroom
+
681 IEEE80211_ENCRYPT_HEADROOM
+
682 IEEE80211_ENCRYPT_TAILROOM
);
685 /* Make sure that all fragments use the same priority so
686 * that they end up using the same TX queue */
687 frag
->priority
= first
->priority
;
688 skb_reserve(frag
, tx
->local
->tx_headroom
+
689 IEEE80211_ENCRYPT_HEADROOM
);
690 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
691 memcpy(fhdr
, first
->data
, hdrlen
);
692 if (i
== num_fragm
- 2)
693 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
694 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
695 copylen
= left
> per_fragm
? per_fragm
: left
;
696 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
697 memcpy(frag
->cb
, first
->cb
, sizeof(frag
->cb
));
698 skb_copy_queue_mapping(frag
, first
);
699 frag
->do_not_encrypt
= first
->do_not_encrypt
;
704 skb_trim(first
, hdrlen
+ per_fragm
);
706 tx
->num_extra_frag
= num_fragm
- 1;
707 tx
->extra_frag
= frags
;
713 for (i
= 0; i
< num_fragm
- 1; i
++)
715 dev_kfree_skb(frags
[i
]);
718 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
722 static ieee80211_tx_result debug_noinline
723 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
728 switch (tx
->key
->conf
.alg
) {
730 return ieee80211_crypto_wep_encrypt(tx
);
732 return ieee80211_crypto_tkip_encrypt(tx
);
734 return ieee80211_crypto_ccmp_encrypt(tx
);
742 static ieee80211_tx_result debug_noinline
743 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
745 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
747 int group_addr
= is_multicast_ether_addr(hdr
->addr1
);
749 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
)) {
750 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
, 0);
754 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
,
755 tx
->extra_frag
[0]->len
);
757 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
758 if (i
+ 1 < tx
->num_extra_frag
) {
759 next_len
= tx
->extra_frag
[i
+ 1]->len
;
762 tx
->rate_idx
= tx
->last_frag_rate_idx
;
765 hdr
= (struct ieee80211_hdr
*)tx
->extra_frag
[i
]->data
;
766 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
772 static ieee80211_tx_result debug_noinline
773 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
780 tx
->sta
->tx_packets
++;
781 tx
->sta
->tx_fragments
++;
782 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
783 if (tx
->extra_frag
) {
784 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
785 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
786 tx
->sta
->tx_bytes
+= tx
->extra_frag
[i
]->len
;
793 /* actual transmit path */
796 * deal with packet injection down monitor interface
797 * with Radiotap Header -- only called for monitor mode interface
799 static ieee80211_tx_result
800 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
804 * this is the moment to interpret and discard the radiotap header that
805 * must be at the start of the packet injected in Monitor mode
807 * Need to take some care with endian-ness since radiotap
808 * args are little-endian
811 struct ieee80211_radiotap_iterator iterator
;
812 struct ieee80211_radiotap_header
*rthdr
=
813 (struct ieee80211_radiotap_header
*) skb
->data
;
814 struct ieee80211_supported_band
*sband
;
815 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
816 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
818 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
820 skb
->do_not_encrypt
= 1;
821 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
824 * for every radiotap entry that is present
825 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
826 * entries present, or -EINVAL on error)
832 ret
= ieee80211_radiotap_iterator_next(&iterator
);
837 /* see if this argument is something we can use */
838 switch (iterator
.this_arg_index
) {
840 * You must take care when dereferencing iterator.this_arg
841 * for multibyte types... the pointer is not aligned. Use
842 * get_unaligned((type *)iterator.this_arg) to dereference
843 * iterator.this_arg for type "type" safely on all arches.
845 case IEEE80211_RADIOTAP_RATE
:
847 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
848 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
850 target_rate
= (*iterator
.this_arg
) * 5;
851 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
852 struct ieee80211_rate
*r
;
854 r
= &sband
->bitrates
[i
];
856 if (r
->bitrate
== target_rate
) {
863 case IEEE80211_RADIOTAP_ANTENNA
:
865 * radiotap uses 0 for 1st ant, mac80211 is 1 for
868 info
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
872 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
873 control
->power_level
= *iterator
.this_arg
;
877 case IEEE80211_RADIOTAP_FLAGS
:
878 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
880 * this indicates that the skb we have been
881 * handed has the 32-bit FCS CRC at the end...
882 * we should react to that by snipping it off
883 * because it will be recomputed and added
886 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
889 skb_trim(skb
, skb
->len
- FCS_LEN
);
891 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
892 tx
->skb
->do_not_encrypt
= 0;
893 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
894 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
898 * Please update the file
899 * Documentation/networking/mac80211-injection.txt
900 * when parsing new fields here.
908 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
912 * remove the radiotap header
913 * iterator->max_length was sanity-checked against
914 * skb->len by iterator init
916 skb_pull(skb
, iterator
.max_length
);
924 static ieee80211_tx_result
925 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
927 struct net_device
*dev
)
929 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
930 struct ieee80211_hdr
*hdr
;
931 struct ieee80211_sub_if_data
*sdata
;
932 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
936 memset(tx
, 0, sizeof(*tx
));
938 tx
->dev
= dev
; /* use original interface */
940 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
941 tx
->channel
= local
->hw
.conf
.channel
;
943 tx
->last_frag_rate_idx
= -1;
945 * Set this flag (used below to indicate "automatic fragmentation"),
946 * it will be cleared/left by radiotap as desired.
948 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
950 /* process and remove the injection radiotap header */
951 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
952 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
953 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
957 * __ieee80211_parse_tx_radiotap has now removed
958 * the radiotap header that was present and pre-filled
959 * 'tx' with tx control information.
963 hdr
= (struct ieee80211_hdr
*) skb
->data
;
965 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
967 if (is_multicast_ether_addr(hdr
->addr1
)) {
968 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
969 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
971 tx
->flags
|= IEEE80211_TX_UNICAST
;
972 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
975 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
976 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
977 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
978 !local
->ops
->set_frag_threshold
&&
979 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
980 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
982 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
986 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
987 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
988 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
990 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
991 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
992 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
993 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
995 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1001 * NB: @tx is uninitialised when passed in here
1003 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1004 struct ieee80211_tx_data
*tx
,
1005 struct sk_buff
*skb
)
1007 struct net_device
*dev
;
1009 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1010 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1016 /* initialises tx with control */
1017 __ieee80211_tx_prepare(tx
, skb
, dev
);
1022 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1023 struct ieee80211_tx_data
*tx
)
1025 struct ieee80211_tx_info
*info
;
1029 if (netif_subqueue_stopped(local
->mdev
, skb
))
1030 return IEEE80211_TX_AGAIN
;
1031 info
= IEEE80211_SKB_CB(skb
);
1033 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1035 return IEEE80211_TX_AGAIN
;
1036 local
->mdev
->trans_start
= jiffies
;
1037 ieee80211_led_tx(local
, 1);
1039 if (tx
->extra_frag
) {
1040 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1041 if (!tx
->extra_frag
[i
])
1043 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1044 info
->flags
&= ~(IEEE80211_TX_CTL_USE_RTS_CTS
|
1045 IEEE80211_TX_CTL_USE_CTS_PROTECT
|
1046 IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1047 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1048 if (netif_subqueue_stopped(local
->mdev
,
1050 return IEEE80211_TX_FRAG_AGAIN
;
1051 if (i
== tx
->num_extra_frag
) {
1052 info
->tx_rate_idx
= tx
->last_frag_rate_idx
;
1054 if (tx
->flags
& IEEE80211_TX_PROBE_LAST_FRAG
)
1056 IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1059 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1062 ret
= local
->ops
->tx(local_to_hw(local
),
1065 return IEEE80211_TX_FRAG_AGAIN
;
1066 local
->mdev
->trans_start
= jiffies
;
1067 ieee80211_led_tx(local
, 1);
1068 tx
->extra_frag
[i
] = NULL
;
1070 kfree(tx
->extra_frag
);
1071 tx
->extra_frag
= NULL
;
1073 return IEEE80211_TX_OK
;
1077 * Invoke TX handlers, return 0 on success and non-zero if the
1078 * frame was dropped or queued.
1080 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1082 struct sk_buff
*skb
= tx
->skb
;
1083 ieee80211_tx_result res
= TX_DROP
;
1086 #define CALL_TXH(txh) \
1088 if (res != TX_CONTINUE) \
1091 CALL_TXH(ieee80211_tx_h_check_assoc
)
1092 CALL_TXH(ieee80211_tx_h_ps_buf
)
1093 CALL_TXH(ieee80211_tx_h_select_key
)
1094 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1095 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1096 CALL_TXH(ieee80211_tx_h_misc
)
1097 CALL_TXH(ieee80211_tx_h_sequence
)
1098 CALL_TXH(ieee80211_tx_h_fragment
)
1099 /* handlers after fragment must be aware of tx info fragmentation! */
1100 CALL_TXH(ieee80211_tx_h_encrypt
)
1101 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1102 CALL_TXH(ieee80211_tx_h_stats
)
1106 if (unlikely(res
== TX_DROP
)) {
1107 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1109 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1110 if (tx
->extra_frag
[i
])
1111 dev_kfree_skb(tx
->extra_frag
[i
]);
1112 kfree(tx
->extra_frag
);
1114 } else if (unlikely(res
== TX_QUEUED
)) {
1115 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1122 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1124 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1125 struct sta_info
*sta
;
1126 struct ieee80211_tx_data tx
;
1127 ieee80211_tx_result res_prepare
;
1128 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1132 queue
= skb_get_queue_mapping(skb
);
1134 WARN_ON(test_bit(queue
, local
->queues_pending
));
1136 if (unlikely(skb
->len
< 10)) {
1143 /* initialises tx */
1144 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1146 if (res_prepare
== TX_DROP
) {
1153 tx
.channel
= local
->hw
.conf
.channel
;
1154 info
->band
= tx
.channel
->band
;
1156 if (invoke_tx_handlers(&tx
))
1160 ret
= __ieee80211_tx(local
, skb
, &tx
);
1162 struct ieee80211_tx_stored_packet
*store
;
1165 * Since there are no fragmented frames on A-MPDU
1166 * queues, there's no reason for a driver to reject
1167 * a frame there, warn and drop it.
1169 if (WARN_ON(queue
>= ieee80211_num_regular_queues(&local
->hw
)))
1172 store
= &local
->pending_packet
[queue
];
1174 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1177 set_bit(queue
, local
->queues_pending
);
1180 * When the driver gets out of buffers during sending of
1181 * fragments and calls ieee80211_stop_queue, the netif
1182 * subqueue is stopped. There is, however, a small window
1183 * in which the PENDING bit is not yet set. If a buffer
1184 * gets available in that window (i.e. driver calls
1185 * ieee80211_wake_queue), we would end up with ieee80211_tx
1186 * called with the PENDING bit still set. Prevent this by
1187 * continuing transmitting here when that situation is
1188 * possible to have happened.
1190 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1191 clear_bit(queue
, local
->queues_pending
);
1195 store
->extra_frag
= tx
.extra_frag
;
1196 store
->num_extra_frag
= tx
.num_extra_frag
;
1197 store
->last_frag_rate_idx
= tx
.last_frag_rate_idx
;
1198 store
->last_frag_rate_ctrl_probe
=
1199 !!(tx
.flags
& IEEE80211_TX_PROBE_LAST_FRAG
);
1208 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1209 if (tx
.extra_frag
[i
])
1210 dev_kfree_skb(tx
.extra_frag
[i
]);
1211 kfree(tx
.extra_frag
);
1216 /* device xmit handlers */
1218 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1219 struct sk_buff
*skb
,
1220 int head_need
, bool may_encrypt
)
1225 * This could be optimised, devices that do full hardware
1226 * crypto (including TKIP MMIC) need no tailroom... But we
1227 * have no drivers for such devices currently.
1230 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1231 tail_need
-= skb_tailroom(skb
);
1232 tail_need
= max_t(int, tail_need
, 0);
1235 if (head_need
|| tail_need
) {
1236 /* Sorry. Can't account for this any more */
1240 if (skb_header_cloned(skb
))
1241 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1243 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1245 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1246 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1247 wiphy_name(local
->hw
.wiphy
));
1251 /* update truesize too */
1252 skb
->truesize
+= head_need
+ tail_need
;
1257 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1259 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1260 struct ieee80211_local
*local
= mpriv
->local
;
1261 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1262 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1263 struct net_device
*odev
= NULL
;
1264 struct ieee80211_sub_if_data
*osdata
;
1271 } monitor_iface
= NOT_MONITOR
;
1275 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1276 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1280 if (unlikely(!odev
)) {
1281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1282 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1283 "originating device\n", dev
->name
);
1289 memset(info
, 0, sizeof(*info
));
1291 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1293 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1295 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1296 ieee80211_is_data(hdr
->frame_control
)) {
1297 if (is_multicast_ether_addr(hdr
->addr3
))
1298 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1300 if (mesh_nexthop_lookup(skb
, osdata
))
1302 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1303 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1305 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1306 struct ieee80211_sub_if_data
*sdata
;
1310 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1311 monitor_iface
= UNKNOWN_ADDRESS
;
1313 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1314 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1315 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1317 /* check the header is complete in the frame */
1318 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1320 * We process outgoing injected frames that have a
1321 * local address we handle as though they are our
1323 * This code here isn't entirely correct, the local
1324 * MAC address is not necessarily enough to find
1325 * the interface to use; for that proper VLAN/WDS
1326 * support we will need a different mechanism.
1330 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1332 if (!netif_running(sdata
->dev
))
1334 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1336 dev_hold(sdata
->dev
);
1340 skb
->iif
= sdata
->dev
->ifindex
;
1341 monitor_iface
= FOUND_SDATA
;
1349 may_encrypt
= !skb
->do_not_encrypt
;
1351 headroom
= osdata
->local
->tx_headroom
;
1353 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1354 headroom
-= skb_headroom(skb
);
1355 headroom
= max_t(int, 0, headroom
);
1357 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1363 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1364 osdata
= container_of(osdata
->bss
,
1365 struct ieee80211_sub_if_data
,
1367 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1368 info
->control
.vif
= &osdata
->vif
;
1369 ret
= ieee80211_tx(odev
, skb
);
1375 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1376 struct net_device
*dev
)
1378 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1379 struct ieee80211_radiotap_header
*prthdr
=
1380 (struct ieee80211_radiotap_header
*)skb
->data
;
1383 /* check for not even having the fixed radiotap header part */
1384 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1385 goto fail
; /* too short to be possibly valid */
1387 /* is it a header version we can trust to find length from? */
1388 if (unlikely(prthdr
->it_version
))
1389 goto fail
; /* only version 0 is supported */
1391 /* then there must be a radiotap header with a length we can use */
1392 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1394 /* does the skb contain enough to deliver on the alleged length? */
1395 if (unlikely(skb
->len
< len_rthdr
))
1396 goto fail
; /* skb too short for claimed rt header extent */
1398 skb
->dev
= local
->mdev
;
1400 /* needed because we set skb device to master */
1401 skb
->iif
= dev
->ifindex
;
1403 /* sometimes we do encrypt injected frames, will be fixed
1404 * up in radiotap parser if not wanted */
1405 skb
->do_not_encrypt
= 0;
1408 * fix up the pointers accounting for the radiotap
1409 * header still being in there. We are being given
1410 * a precooked IEEE80211 header so no need for
1413 skb_set_mac_header(skb
, len_rthdr
);
1415 * these are just fixed to the end of the rt area since we
1416 * don't have any better information and at this point, nobody cares
1418 skb_set_network_header(skb
, len_rthdr
);
1419 skb_set_transport_header(skb
, len_rthdr
);
1421 /* pass the radiotap header up to the next stage intact */
1422 dev_queue_xmit(skb
);
1423 return NETDEV_TX_OK
;
1427 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1431 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1432 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1433 * @skb: packet to be sent
1434 * @dev: incoming interface
1436 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1437 * not be freed, and caller is responsible for either retrying later or freeing
1440 * This function takes in an Ethernet header and encapsulates it with suitable
1441 * IEEE 802.11 header based on which interface the packet is coming in. The
1442 * encapsulated packet will then be passed to master interface, wlan#.11, for
1443 * transmission (through low-level driver).
1445 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1446 struct net_device
*dev
)
1448 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1449 struct ieee80211_local
*local
= sdata
->local
;
1450 int ret
= 1, head_need
;
1451 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1453 struct ieee80211_hdr hdr
;
1454 struct ieee80211s_hdr mesh_hdr
;
1455 const u8
*encaps_data
;
1456 int encaps_len
, skip_header_bytes
;
1458 struct sta_info
*sta
;
1461 if (unlikely(skb
->len
< ETH_HLEN
)) {
1466 nh_pos
= skb_network_header(skb
) - skb
->data
;
1467 h_pos
= skb_transport_header(skb
) - skb
->data
;
1469 /* convert Ethernet header to proper 802.11 header (based on
1470 * operation mode) */
1471 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1472 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1474 switch (sdata
->vif
.type
) {
1475 case NL80211_IFTYPE_AP
:
1476 case NL80211_IFTYPE_AP_VLAN
:
1477 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1479 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1480 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1481 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1484 case NL80211_IFTYPE_WDS
:
1485 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1487 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1488 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1489 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1490 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1493 #ifdef CONFIG_MAC80211_MESH
1494 case NL80211_IFTYPE_MESH_POINT
:
1495 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1496 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1497 /* Do not send frames with mesh_ttl == 0 */
1498 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1502 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1504 if (compare_ether_addr(dev
->dev_addr
,
1505 skb
->data
+ ETH_ALEN
) == 0) {
1507 memset(hdr
.addr1
, 0, ETH_ALEN
);
1508 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1509 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1510 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1511 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1513 /* packet from other interface */
1514 struct mesh_path
*mppath
;
1516 memset(hdr
.addr1
, 0, ETH_ALEN
);
1517 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1518 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1520 if (is_multicast_ether_addr(skb
->data
))
1521 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1524 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1526 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1528 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1532 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1533 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1534 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1535 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1536 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1537 sdata
->u
.mesh
.mesh_seqnum
++;
1543 case NL80211_IFTYPE_STATION
:
1544 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1546 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1547 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1548 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1551 case NL80211_IFTYPE_ADHOC
:
1553 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1554 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1555 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1564 * There's no need to try to look up the destination
1565 * if it is a multicast address (which can only happen
1568 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1570 sta
= sta_info_get(local
, hdr
.addr1
);
1572 sta_flags
= get_sta_flags(sta
);
1576 /* receiver and we are QoS enabled, use a QoS type frame */
1577 if (sta_flags
& WLAN_STA_WME
&&
1578 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1579 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1584 * Drop unicast frames to unauthorised stations unless they are
1585 * EAPOL frames from the local station.
1587 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1588 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1589 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1590 !(ethertype
== ETH_P_PAE
&&
1591 compare_ether_addr(dev
->dev_addr
,
1592 skb
->data
+ ETH_ALEN
) == 0))) {
1593 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1594 if (net_ratelimit())
1595 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1596 " (unauthorized port)\n", dev
->name
,
1600 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1606 hdr
.frame_control
= fc
;
1607 hdr
.duration_id
= 0;
1610 skip_header_bytes
= ETH_HLEN
;
1611 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1612 encaps_data
= bridge_tunnel_header
;
1613 encaps_len
= sizeof(bridge_tunnel_header
);
1614 skip_header_bytes
-= 2;
1615 } else if (ethertype
>= 0x600) {
1616 encaps_data
= rfc1042_header
;
1617 encaps_len
= sizeof(rfc1042_header
);
1618 skip_header_bytes
-= 2;
1624 skb_pull(skb
, skip_header_bytes
);
1625 nh_pos
-= skip_header_bytes
;
1626 h_pos
-= skip_header_bytes
;
1628 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1631 * So we need to modify the skb header and hence need a copy of
1632 * that. The head_need variable above doesn't, so far, include
1633 * the needed header space that we don't need right away. If we
1634 * can, then we don't reallocate right now but only after the
1635 * frame arrives at the master device (if it does...)
1637 * If we cannot, however, then we will reallocate to include all
1638 * the ever needed space. Also, if we need to reallocate it anyway,
1639 * make it big enough for everything we may ever need.
1642 if (head_need
> 0 || skb_cloned(skb
)) {
1643 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1644 head_need
+= local
->tx_headroom
;
1645 head_need
= max_t(int, 0, head_need
);
1646 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1651 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1652 nh_pos
+= encaps_len
;
1653 h_pos
+= encaps_len
;
1656 if (meshhdrlen
> 0) {
1657 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1658 nh_pos
+= meshhdrlen
;
1659 h_pos
+= meshhdrlen
;
1662 if (ieee80211_is_data_qos(fc
)) {
1663 __le16
*qos_control
;
1665 qos_control
= (__le16
*) skb_push(skb
, 2);
1666 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1668 * Maybe we could actually set some fields here, for now just
1669 * initialise to zero to indicate no special operation.
1673 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1678 skb
->iif
= dev
->ifindex
;
1680 skb
->dev
= local
->mdev
;
1681 dev
->stats
.tx_packets
++;
1682 dev
->stats
.tx_bytes
+= skb
->len
;
1684 /* Update skb pointers to various headers since this modified frame
1685 * is going to go through Linux networking code that may potentially
1686 * need things like pointer to IP header. */
1687 skb_set_mac_header(skb
, 0);
1688 skb_set_network_header(skb
, nh_pos
);
1689 skb_set_transport_header(skb
, h_pos
);
1691 dev
->trans_start
= jiffies
;
1692 dev_queue_xmit(skb
);
1705 * ieee80211_clear_tx_pending may not be called in a context where
1706 * it is possible that it packets could come in again.
1708 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1711 struct ieee80211_tx_stored_packet
*store
;
1713 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1714 if (!test_bit(i
, local
->queues_pending
))
1716 store
= &local
->pending_packet
[i
];
1717 kfree_skb(store
->skb
);
1718 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1719 kfree_skb(store
->extra_frag
[j
]);
1720 kfree(store
->extra_frag
);
1721 clear_bit(i
, local
->queues_pending
);
1726 * Transmit all pending packets. Called from tasklet, locks master device
1727 * TX lock so that no new packets can come in.
1729 void ieee80211_tx_pending(unsigned long data
)
1731 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1732 struct net_device
*dev
= local
->mdev
;
1733 struct ieee80211_tx_stored_packet
*store
;
1734 struct ieee80211_tx_data tx
;
1737 netif_tx_lock_bh(dev
);
1738 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1739 /* Check that this queue is ok */
1740 if (__netif_subqueue_stopped(local
->mdev
, i
) &&
1741 !test_bit(i
, local
->queues_pending_run
))
1744 if (!test_bit(i
, local
->queues_pending
)) {
1745 clear_bit(i
, local
->queues_pending_run
);
1746 ieee80211_wake_queue(&local
->hw
, i
);
1750 clear_bit(i
, local
->queues_pending_run
);
1751 netif_start_subqueue(local
->mdev
, i
);
1753 store
= &local
->pending_packet
[i
];
1754 tx
.extra_frag
= store
->extra_frag
;
1755 tx
.num_extra_frag
= store
->num_extra_frag
;
1756 tx
.last_frag_rate_idx
= store
->last_frag_rate_idx
;
1758 if (store
->last_frag_rate_ctrl_probe
)
1759 tx
.flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
1760 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1762 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1765 clear_bit(i
, local
->queues_pending
);
1766 ieee80211_wake_queue(&local
->hw
, i
);
1769 netif_tx_unlock_bh(dev
);
1772 /* functions for drivers to get certain frames */
1774 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1775 struct ieee80211_if_ap
*bss
,
1776 struct sk_buff
*skb
,
1777 struct beacon_data
*beacon
)
1781 int i
, have_bits
= 0, n1
, n2
;
1783 /* Generate bitmap for TIM only if there are any STAs in power save
1785 if (atomic_read(&bss
->num_sta_ps
) > 0)
1786 /* in the hope that this is faster than
1787 * checking byte-for-byte */
1788 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1789 IEEE80211_MAX_AID
+1);
1791 if (bss
->dtim_count
== 0)
1792 bss
->dtim_count
= beacon
->dtim_period
- 1;
1796 tim
= pos
= (u8
*) skb_put(skb
, 6);
1797 *pos
++ = WLAN_EID_TIM
;
1799 *pos
++ = bss
->dtim_count
;
1800 *pos
++ = beacon
->dtim_period
;
1802 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1806 /* Find largest even number N1 so that bits numbered 1 through
1807 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1808 * (N2 + 1) x 8 through 2007 are 0. */
1810 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1817 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1824 /* Bitmap control */
1826 /* Part Virt Bitmap */
1827 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1829 tim
[1] = n2
- n1
+ 4;
1830 skb_put(skb
, n2
- n1
);
1832 *pos
++ = aid0
; /* Bitmap control */
1833 *pos
++ = 0; /* Part Virt Bitmap */
1837 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1838 struct ieee80211_vif
*vif
)
1840 struct ieee80211_local
*local
= hw_to_local(hw
);
1841 struct sk_buff
*skb
= NULL
;
1842 struct ieee80211_tx_info
*info
;
1843 struct net_device
*bdev
;
1844 struct ieee80211_sub_if_data
*sdata
= NULL
;
1845 struct ieee80211_if_ap
*ap
= NULL
;
1846 struct ieee80211_if_sta
*ifsta
= NULL
;
1847 struct rate_selection rsel
;
1848 struct beacon_data
*beacon
;
1849 struct ieee80211_supported_band
*sband
;
1850 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1852 sband
= local
->hw
.wiphy
->bands
[band
];
1856 sdata
= vif_to_sdata(vif
);
1859 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1861 beacon
= rcu_dereference(ap
->beacon
);
1864 * headroom, head length,
1865 * tail length and maximum TIM length
1867 skb
= dev_alloc_skb(local
->tx_headroom
+
1869 beacon
->tail_len
+ 256);
1873 skb_reserve(skb
, local
->tx_headroom
);
1874 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1878 * Not very nice, but we want to allow the driver to call
1879 * ieee80211_beacon_get() as a response to the set_tim()
1880 * callback. That, however, is already invoked under the
1881 * sta_lock to guarantee consistent and race-free update
1882 * of the tim bitmap in mac80211 and the driver.
1884 if (local
->tim_in_locked_section
) {
1885 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1887 unsigned long flags
;
1889 spin_lock_irqsave(&local
->sta_lock
, flags
);
1890 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1891 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1895 memcpy(skb_put(skb
, beacon
->tail_len
),
1896 beacon
->tail
, beacon
->tail_len
);
1899 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1900 struct ieee80211_hdr
*hdr
;
1901 ifsta
= &sdata
->u
.sta
;
1903 if (!ifsta
->probe_resp
)
1906 skb
= skb_copy(ifsta
->probe_resp
, GFP_ATOMIC
);
1910 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1911 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1912 IEEE80211_STYPE_BEACON
);
1914 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1915 struct ieee80211_mgmt
*mgmt
;
1918 /* headroom, head length, tail length and maximum TIM length */
1919 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1923 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1924 mgmt
= (struct ieee80211_mgmt
*)
1925 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
1926 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
1927 mgmt
->frame_control
=
1928 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
1929 memset(mgmt
->da
, 0xff, ETH_ALEN
);
1930 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1931 /* BSSID is left zeroed, wildcard value */
1932 mgmt
->u
.beacon
.beacon_int
=
1933 cpu_to_le16(local
->hw
.conf
.beacon_int
);
1934 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
1936 pos
= skb_put(skb
, 2);
1937 *pos
++ = WLAN_EID_SSID
;
1940 mesh_mgmt_ies_add(skb
, sdata
);
1946 info
= IEEE80211_SKB_CB(skb
);
1948 skb
->do_not_encrypt
= 1;
1951 rate_control_get_rate(sdata
, sband
, NULL
, skb
, &rsel
);
1953 if (unlikely(rsel
.rate_idx
< 0)) {
1954 if (net_ratelimit()) {
1955 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1957 wiphy_name(local
->hw
.wiphy
));
1959 dev_kfree_skb_any(skb
);
1964 info
->control
.vif
= vif
;
1965 info
->tx_rate_idx
= rsel
.rate_idx
;
1967 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1968 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1969 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
1970 if (sdata
->bss_conf
.use_short_preamble
&&
1971 sband
->bitrates
[rsel
.rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
1972 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
1974 info
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1975 info
->control
.retry_limit
= 1;
1981 EXPORT_SYMBOL(ieee80211_beacon_get
);
1983 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1984 const void *frame
, size_t frame_len
,
1985 const struct ieee80211_tx_info
*frame_txctl
,
1986 struct ieee80211_rts
*rts
)
1988 const struct ieee80211_hdr
*hdr
= frame
;
1990 rts
->frame_control
=
1991 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
1992 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1994 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1995 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1997 EXPORT_SYMBOL(ieee80211_rts_get
);
1999 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2000 const void *frame
, size_t frame_len
,
2001 const struct ieee80211_tx_info
*frame_txctl
,
2002 struct ieee80211_cts
*cts
)
2004 const struct ieee80211_hdr
*hdr
= frame
;
2006 cts
->frame_control
=
2007 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2008 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2009 frame_len
, frame_txctl
);
2010 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2012 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2015 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2016 struct ieee80211_vif
*vif
)
2018 struct ieee80211_local
*local
= hw_to_local(hw
);
2019 struct sk_buff
*skb
= NULL
;
2020 struct sta_info
*sta
;
2021 struct ieee80211_tx_data tx
;
2022 struct net_device
*bdev
;
2023 struct ieee80211_sub_if_data
*sdata
;
2024 struct ieee80211_if_ap
*bss
= NULL
;
2025 struct beacon_data
*beacon
;
2026 struct ieee80211_tx_info
*info
;
2028 sdata
= vif_to_sdata(vif
);
2036 beacon
= rcu_dereference(bss
->beacon
);
2038 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2041 if (bss
->dtim_count
!= 0)
2042 goto out
; /* send buffered bc/mc only after DTIM beacon */
2045 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2048 local
->total_ps_buffered
--;
2050 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2051 struct ieee80211_hdr
*hdr
=
2052 (struct ieee80211_hdr
*) skb
->data
;
2053 /* more buffered multicast/broadcast frames ==> set
2054 * MoreData flag in IEEE 802.11 header to inform PS
2056 hdr
->frame_control
|=
2057 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2060 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2062 dev_kfree_skb_any(skb
);
2065 info
= IEEE80211_SKB_CB(skb
);
2068 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2069 tx
.channel
= local
->hw
.conf
.channel
;
2070 info
->band
= tx
.channel
->band
;
2072 if (invoke_tx_handlers(&tx
))
2079 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);