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
38 #define IEEE80211_TX_PENDING 3
42 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
45 int rate
, mrate
, erp
, dur
, i
;
46 struct ieee80211_rate
*txrate
;
47 struct ieee80211_local
*local
= tx
->local
;
48 struct ieee80211_supported_band
*sband
;
49 struct ieee80211_hdr
*hdr
;
50 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
52 /* assume HW handles this */
53 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
57 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
60 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
61 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
63 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
83 if (ieee80211_is_ctl(hdr
->frame_control
)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr
) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate
= sband
->bitrates
[0].bitrate
;
121 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
122 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
124 if (r
->bitrate
> txrate
->bitrate
)
127 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
130 switch (sband
->band
) {
131 case IEEE80211_BAND_2GHZ
: {
133 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
134 flag
= IEEE80211_RATE_MANDATORY_G
;
136 flag
= IEEE80211_RATE_MANDATORY_B
;
141 case IEEE80211_BAND_5GHZ
:
142 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
161 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur
*= 2; /* ACK + SIFS */
168 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
169 txrate
->bitrate
, erp
,
170 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
173 return cpu_to_le16(dur
);
176 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
177 struct net_device
*dev
)
179 return local
== wdev_priv(dev
->ieee80211_ptr
);
184 static ieee80211_tx_result debug_noinline
185 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
188 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
189 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
192 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
195 if (unlikely(tx
->local
->sw_scanning
) &&
196 !ieee80211_is_probe_req(hdr
->frame_control
))
199 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
202 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
205 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
207 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
208 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
209 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
210 ieee80211_is_data(hdr
->frame_control
))) {
211 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
212 printk(KERN_DEBUG
"%s: dropped data frame to not "
213 "associated station %pM\n",
214 tx
->dev
->name
, hdr
->addr1
);
215 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
216 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
220 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
221 tx
->local
->num_sta
== 0 &&
222 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
224 * No associated STAs - no need to send multicast
235 /* This function is called whenever the AP is about to exceed the maximum limit
236 * of buffered frames for power saving STAs. This situation should not really
237 * happen often during normal operation, so dropping the oldest buffered packet
238 * from each queue should be OK to make some room for new frames. */
239 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
241 int total
= 0, purged
= 0;
243 struct ieee80211_sub_if_data
*sdata
;
244 struct sta_info
*sta
;
247 * virtual interfaces are protected by RCU
251 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
252 struct ieee80211_if_ap
*ap
;
253 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
256 skb
= skb_dequeue(&ap
->ps_bc_buf
);
261 total
+= skb_queue_len(&ap
->ps_bc_buf
);
264 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
265 skb
= skb_dequeue(&sta
->ps_tx_buf
);
270 total
+= skb_queue_len(&sta
->ps_tx_buf
);
275 local
->total_ps_buffered
= total
;
276 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
277 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
278 wiphy_name(local
->hw
.wiphy
), purged
);
282 static ieee80211_tx_result
283 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
285 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
286 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
289 * broadcast/multicast frame
291 * If any of the associated stations is in power save mode,
292 * the frame is buffered to be sent after DTIM beacon frame.
293 * This is done either by the hardware or us.
296 /* powersaving STAs only in AP/VLAN mode */
300 /* no buffering for ordered frames */
301 if (ieee80211_has_order(hdr
->frame_control
))
304 /* no stations in PS mode */
305 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
308 /* buffered in mac80211 */
309 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
310 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
311 purge_old_ps_buffers(tx
->local
);
312 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
314 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
315 if (net_ratelimit()) {
316 printk(KERN_DEBUG
"%s: BC TX buffer full - "
317 "dropping the oldest frame\n",
321 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
323 tx
->local
->total_ps_buffered
++;
324 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
328 /* buffered in hardware */
329 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
334 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
337 if (!ieee80211_is_mgmt(fc
))
340 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
343 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
350 static ieee80211_tx_result
351 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
353 struct sta_info
*sta
= tx
->sta
;
354 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
355 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
358 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
361 staflags
= get_sta_flags(sta
);
363 if (unlikely((staflags
& WLAN_STA_PS
) &&
364 !(staflags
& WLAN_STA_PSPOLL
))) {
365 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
366 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
368 sta
->sta
.addr
, sta
->sta
.aid
,
369 skb_queue_len(&sta
->ps_tx_buf
));
370 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
371 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
372 purge_old_ps_buffers(tx
->local
);
373 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
374 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
375 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
376 if (net_ratelimit()) {
377 printk(KERN_DEBUG
"%s: STA %pM TX "
378 "buffer full - dropping oldest frame\n",
379 tx
->dev
->name
, sta
->sta
.addr
);
384 tx
->local
->total_ps_buffered
++;
386 /* Queue frame to be sent after STA sends an PS Poll frame */
387 if (skb_queue_empty(&sta
->ps_tx_buf
))
388 sta_info_set_tim_bit(sta
);
390 info
->control
.jiffies
= jiffies
;
391 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
394 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
395 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
396 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
397 "set -> send frame\n", tx
->dev
->name
,
400 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
401 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
406 static ieee80211_tx_result debug_noinline
407 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
409 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
412 if (tx
->flags
& IEEE80211_TX_UNICAST
)
413 return ieee80211_tx_h_unicast_ps_buf(tx
);
415 return ieee80211_tx_h_multicast_ps_buf(tx
);
418 static ieee80211_tx_result debug_noinline
419 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
421 struct ieee80211_key
*key
;
422 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
423 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
425 if (unlikely(tx
->skb
->do_not_encrypt
))
427 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
429 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
430 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
432 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
434 else if (tx
->sdata
->drop_unencrypted
&&
435 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
436 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
437 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
438 (ieee80211_is_action(hdr
->frame_control
) &&
439 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
440 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
446 tx
->key
->tx_rx_count
++;
447 /* TODO: add threshold stuff again */
449 switch (tx
->key
->conf
.alg
) {
451 if (ieee80211_is_auth(hdr
->frame_control
))
454 if (!ieee80211_is_data_present(hdr
->frame_control
))
458 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
459 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
464 if (!ieee80211_is_mgmt(hdr
->frame_control
))
470 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
471 tx
->skb
->do_not_encrypt
= 1;
476 static ieee80211_tx_result debug_noinline
477 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
479 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
480 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
481 struct ieee80211_supported_band
*sband
;
482 struct ieee80211_rate
*rate
;
484 bool inval
= false, rts
= false, short_preamble
= false;
485 struct ieee80211_tx_rate_control txrc
;
487 memset(&txrc
, 0, sizeof(txrc
));
489 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
491 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
492 tx
->local
->fragmentation_threshold
);
494 /* set up the tx rate control struct we give the RC algo */
495 txrc
.hw
= local_to_hw(tx
->local
);
497 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
499 txrc
.reported_rate
.idx
= -1;
500 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
502 /* set up RTS protection if desired */
503 if (tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
&&
504 len
> tx
->local
->rts_threshold
) {
505 txrc
.rts
= rts
= true;
509 * Use short preamble if the BSS can handle it, but not for
510 * management frames unless we know the receiver can handle
511 * that -- the management frame might be to a station that
512 * just wants a probe response.
514 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
515 (ieee80211_is_data(hdr
->frame_control
) ||
516 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
517 txrc
.short_preamble
= short_preamble
= true;
520 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
522 if (unlikely(info
->control
.rates
[0].idx
< 0))
525 if (txrc
.reported_rate
.idx
< 0)
526 txrc
.reported_rate
= info
->control
.rates
[0];
529 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
531 if (unlikely(!info
->control
.rates
[0].count
))
532 info
->control
.rates
[0].count
= 1;
534 if (is_multicast_ether_addr(hdr
->addr1
)) {
536 * XXX: verify the rate is in the basic rateset
542 * set up the RTS/CTS rate as the fastest basic rate
543 * that is not faster than the data rate
545 * XXX: Should this check all retry rates?
547 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
550 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
552 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
553 /* must be a basic rate */
554 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
556 /* must not be faster than the data rate */
557 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
560 if (sband
->bitrates
[baserate
].bitrate
<
561 sband
->bitrates
[i
].bitrate
)
565 info
->control
.rts_cts_rate_idx
= baserate
;
568 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
570 * make sure there's no valid rate following
571 * an invalid one, just in case drivers don't
572 * take the API seriously to stop at -1.
575 info
->control
.rates
[i
].idx
= -1;
578 if (info
->control
.rates
[i
].idx
< 0) {
584 * For now assume MCS is already set up correctly, this
587 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
588 WARN_ON(info
->control
.rates
[i
].idx
> 76);
592 /* set up RTS protection if desired */
594 info
->control
.rates
[i
].flags
|=
595 IEEE80211_TX_RC_USE_RTS_CTS
;
598 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
599 sband
->n_bitrates
)) {
600 info
->control
.rates
[i
].idx
= -1;
604 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
606 /* set up short preamble */
607 if (short_preamble
&&
608 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
609 info
->control
.rates
[i
].flags
|=
610 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
612 /* set up G protection */
613 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
614 rate
->flags
& IEEE80211_RATE_ERP_G
)
615 info
->control
.rates
[i
].flags
|=
616 IEEE80211_TX_RC_USE_CTS_PROTECT
;
622 static ieee80211_tx_result debug_noinline
623 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
625 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
628 info
->control
.sta
= &tx
->sta
->sta
;
633 static ieee80211_tx_result debug_noinline
634 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
636 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
637 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
643 * Packet injection may want to control the sequence
644 * number, if we have no matching interface then we
645 * neither assign one ourselves nor ask the driver to.
647 if (unlikely(!info
->control
.vif
))
650 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
653 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
657 * Anything but QoS data that has a sequence number field
658 * (is long enough) gets a sequence number from the global
661 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
662 /* driver should assign sequence number */
663 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
664 /* for pure STA mode without beacons, we can do it */
665 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
666 tx
->sdata
->sequence_number
+= 0x10;
667 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
672 * This should be true for injected/management frames only, for
673 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
674 * above since they are not QoS-data frames.
679 /* include per-STA, per-TID sequence counter */
681 qc
= ieee80211_get_qos_ctl(hdr
);
682 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
683 seq
= &tx
->sta
->tid_seq
[tid
];
685 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
687 /* Increase the sequence number. */
688 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
693 static ieee80211_tx_result debug_noinline
694 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
696 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
697 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
698 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
699 struct sk_buff
**frags
, *first
, *frag
;
703 int frag_threshold
= tx
->local
->fragmentation_threshold
;
705 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
709 * Warn when submitting a fragmented A-MPDU frame and drop it.
710 * This scenario is handled in __ieee80211_tx_prepare but extra
711 * caution taken here as fragmented ampdu may cause Tx stop.
713 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
718 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
719 payload_len
= first
->len
- hdrlen
;
720 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
721 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
723 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
727 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
728 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
729 pos
= first
->data
+ hdrlen
+ per_fragm
;
730 left
= payload_len
- per_fragm
;
731 for (i
= 0; i
< num_fragm
- 1; i
++) {
732 struct ieee80211_hdr
*fhdr
;
738 /* reserve enough extra head and tail room for possible
741 dev_alloc_skb(tx
->local
->tx_headroom
+
743 IEEE80211_ENCRYPT_HEADROOM
+
744 IEEE80211_ENCRYPT_TAILROOM
);
748 /* Make sure that all fragments use the same priority so
749 * that they end up using the same TX queue */
750 frag
->priority
= first
->priority
;
752 skb_reserve(frag
, tx
->local
->tx_headroom
+
753 IEEE80211_ENCRYPT_HEADROOM
);
755 /* copy TX information */
756 info
= IEEE80211_SKB_CB(frag
);
757 memcpy(info
, first
->cb
, sizeof(frag
->cb
));
759 /* copy/fill in 802.11 header */
760 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
761 memcpy(fhdr
, first
->data
, hdrlen
);
762 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
764 if (i
== num_fragm
- 2) {
765 /* clear MOREFRAGS bit for the last fragment */
766 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
769 * No multi-rate retries for fragmented frames, that
770 * would completely throw off the NAV at other STAs.
772 info
->control
.rates
[1].idx
= -1;
773 info
->control
.rates
[2].idx
= -1;
774 info
->control
.rates
[3].idx
= -1;
775 info
->control
.rates
[4].idx
= -1;
776 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
777 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
781 copylen
= left
> per_fragm
? per_fragm
: left
;
782 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
784 skb_copy_queue_mapping(frag
, first
);
786 frag
->do_not_encrypt
= first
->do_not_encrypt
;
791 skb_trim(first
, hdrlen
+ per_fragm
);
793 tx
->num_extra_frag
= num_fragm
- 1;
794 tx
->extra_frag
= frags
;
800 for (i
= 0; i
< num_fragm
- 1; i
++)
802 dev_kfree_skb(frags
[i
]);
805 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
809 static ieee80211_tx_result debug_noinline
810 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
815 switch (tx
->key
->conf
.alg
) {
817 return ieee80211_crypto_wep_encrypt(tx
);
819 return ieee80211_crypto_tkip_encrypt(tx
);
821 return ieee80211_crypto_ccmp_encrypt(tx
);
823 return ieee80211_crypto_aes_cmac_encrypt(tx
);
831 static ieee80211_tx_result debug_noinline
832 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
834 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
836 int group_addr
= is_multicast_ether_addr(hdr
->addr1
);
838 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
)) {
839 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
, 0);
843 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
,
844 tx
->extra_frag
[0]->len
);
846 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
847 if (i
+ 1 < tx
->num_extra_frag
)
848 next_len
= tx
->extra_frag
[i
+ 1]->len
;
852 hdr
= (struct ieee80211_hdr
*)tx
->extra_frag
[i
]->data
;
853 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
859 static ieee80211_tx_result debug_noinline
860 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
867 tx
->sta
->tx_packets
++;
868 tx
->sta
->tx_fragments
++;
869 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
870 if (tx
->extra_frag
) {
871 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
872 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
873 tx
->sta
->tx_bytes
+= tx
->extra_frag
[i
]->len
;
880 /* actual transmit path */
883 * deal with packet injection down monitor interface
884 * with Radiotap Header -- only called for monitor mode interface
886 static ieee80211_tx_result
887 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
891 * this is the moment to interpret and discard the radiotap header that
892 * must be at the start of the packet injected in Monitor mode
894 * Need to take some care with endian-ness since radiotap
895 * args are little-endian
898 struct ieee80211_radiotap_iterator iterator
;
899 struct ieee80211_radiotap_header
*rthdr
=
900 (struct ieee80211_radiotap_header
*) skb
->data
;
901 struct ieee80211_supported_band
*sband
;
902 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
904 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
906 skb
->do_not_encrypt
= 1;
907 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
910 * for every radiotap entry that is present
911 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
912 * entries present, or -EINVAL on error)
916 ret
= ieee80211_radiotap_iterator_next(&iterator
);
921 /* see if this argument is something we can use */
922 switch (iterator
.this_arg_index
) {
924 * You must take care when dereferencing iterator.this_arg
925 * for multibyte types... the pointer is not aligned. Use
926 * get_unaligned((type *)iterator.this_arg) to dereference
927 * iterator.this_arg for type "type" safely on all arches.
929 case IEEE80211_RADIOTAP_FLAGS
:
930 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
932 * this indicates that the skb we have been
933 * handed has the 32-bit FCS CRC at the end...
934 * we should react to that by snipping it off
935 * because it will be recomputed and added
938 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
941 skb_trim(skb
, skb
->len
- FCS_LEN
);
943 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
944 tx
->skb
->do_not_encrypt
= 0;
945 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
946 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
950 * Please update the file
951 * Documentation/networking/mac80211-injection.txt
952 * when parsing new fields here.
960 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
964 * remove the radiotap header
965 * iterator->max_length was sanity-checked against
966 * skb->len by iterator init
968 skb_pull(skb
, iterator
.max_length
);
976 static ieee80211_tx_result
977 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
979 struct net_device
*dev
)
981 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
982 struct ieee80211_hdr
*hdr
;
983 struct ieee80211_sub_if_data
*sdata
;
984 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
989 memset(tx
, 0, sizeof(*tx
));
991 tx
->dev
= dev
; /* use original interface */
993 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
994 tx
->channel
= local
->hw
.conf
.channel
;
996 * Set this flag (used below to indicate "automatic fragmentation"),
997 * it will be cleared/left by radiotap as desired.
999 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1001 /* process and remove the injection radiotap header */
1002 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1003 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1004 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1008 * __ieee80211_parse_tx_radiotap has now removed
1009 * the radiotap header that was present and pre-filled
1010 * 'tx' with tx control information.
1014 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1016 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1018 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1019 qc
= ieee80211_get_qos_ctl(hdr
);
1020 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1022 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1023 if (*state
== HT_AGG_STATE_OPERATIONAL
)
1024 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1027 if (is_multicast_ether_addr(hdr
->addr1
)) {
1028 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1029 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1031 tx
->flags
|= IEEE80211_TX_UNICAST
;
1032 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1035 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1036 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1037 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1038 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1039 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1041 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1045 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1046 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1047 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1049 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1050 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1051 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1052 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1054 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1060 * NB: @tx is uninitialised when passed in here
1062 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1063 struct ieee80211_tx_data
*tx
,
1064 struct sk_buff
*skb
)
1066 struct net_device
*dev
;
1068 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1069 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1075 /* initialises tx with control */
1076 __ieee80211_tx_prepare(tx
, skb
, dev
);
1081 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1082 struct ieee80211_tx_data
*tx
)
1084 struct ieee80211_tx_info
*info
;
1088 if (netif_subqueue_stopped(local
->mdev
, skb
))
1089 return IEEE80211_TX_PENDING
;
1091 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1093 return IEEE80211_TX_AGAIN
;
1094 local
->mdev
->trans_start
= jiffies
;
1095 ieee80211_led_tx(local
, 1);
1097 if (tx
->extra_frag
) {
1098 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1099 if (!tx
->extra_frag
[i
])
1101 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1102 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1103 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1104 if (netif_subqueue_stopped(local
->mdev
,
1106 return IEEE80211_TX_FRAG_AGAIN
;
1108 ret
= local
->ops
->tx(local_to_hw(local
),
1111 return IEEE80211_TX_FRAG_AGAIN
;
1112 local
->mdev
->trans_start
= jiffies
;
1113 ieee80211_led_tx(local
, 1);
1114 tx
->extra_frag
[i
] = NULL
;
1116 kfree(tx
->extra_frag
);
1117 tx
->extra_frag
= NULL
;
1119 return IEEE80211_TX_OK
;
1123 * Invoke TX handlers, return 0 on success and non-zero if the
1124 * frame was dropped or queued.
1126 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1128 struct sk_buff
*skb
= tx
->skb
;
1129 ieee80211_tx_result res
= TX_DROP
;
1132 #define CALL_TXH(txh) \
1134 if (res != TX_CONTINUE) \
1137 CALL_TXH(ieee80211_tx_h_check_assoc
)
1138 CALL_TXH(ieee80211_tx_h_ps_buf
)
1139 CALL_TXH(ieee80211_tx_h_select_key
)
1140 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1141 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1142 CALL_TXH(ieee80211_tx_h_misc
)
1143 CALL_TXH(ieee80211_tx_h_sequence
)
1144 CALL_TXH(ieee80211_tx_h_fragment
)
1145 /* handlers after fragment must be aware of tx info fragmentation! */
1146 CALL_TXH(ieee80211_tx_h_encrypt
)
1147 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1148 CALL_TXH(ieee80211_tx_h_stats
)
1152 if (unlikely(res
== TX_DROP
)) {
1153 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1155 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1156 if (tx
->extra_frag
[i
])
1157 dev_kfree_skb(tx
->extra_frag
[i
]);
1158 kfree(tx
->extra_frag
);
1160 } else if (unlikely(res
== TX_QUEUED
)) {
1161 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1168 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1170 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1171 struct sta_info
*sta
;
1172 struct ieee80211_tx_data tx
;
1173 ieee80211_tx_result res_prepare
;
1174 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1178 queue
= skb_get_queue_mapping(skb
);
1180 WARN_ON(test_bit(queue
, local
->queues_pending
));
1182 if (unlikely(skb
->len
< 10)) {
1189 /* initialises tx */
1190 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1192 if (res_prepare
== TX_DROP
) {
1199 tx
.channel
= local
->hw
.conf
.channel
;
1200 info
->band
= tx
.channel
->band
;
1202 if (invoke_tx_handlers(&tx
))
1206 ret
= __ieee80211_tx(local
, skb
, &tx
);
1208 struct ieee80211_tx_stored_packet
*store
;
1211 * Since there are no fragmented frames on A-MPDU
1212 * queues, there's no reason for a driver to reject
1213 * a frame there, warn and drop it.
1215 if (ret
!= IEEE80211_TX_PENDING
)
1216 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1219 store
= &local
->pending_packet
[queue
];
1221 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1224 set_bit(queue
, local
->queues_pending
);
1227 * When the driver gets out of buffers during sending of
1228 * fragments and calls ieee80211_stop_queue, the netif
1229 * subqueue is stopped. There is, however, a small window
1230 * in which the PENDING bit is not yet set. If a buffer
1231 * gets available in that window (i.e. driver calls
1232 * ieee80211_wake_queue), we would end up with ieee80211_tx
1233 * called with the PENDING bit still set. Prevent this by
1234 * continuing transmitting here when that situation is
1235 * possible to have happened.
1237 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1238 clear_bit(queue
, local
->queues_pending
);
1242 store
->extra_frag
= tx
.extra_frag
;
1243 store
->num_extra_frag
= tx
.num_extra_frag
;
1252 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1253 if (tx
.extra_frag
[i
])
1254 dev_kfree_skb(tx
.extra_frag
[i
]);
1255 kfree(tx
.extra_frag
);
1260 /* device xmit handlers */
1262 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1263 struct sk_buff
*skb
,
1264 int head_need
, bool may_encrypt
)
1269 * This could be optimised, devices that do full hardware
1270 * crypto (including TKIP MMIC) need no tailroom... But we
1271 * have no drivers for such devices currently.
1274 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1275 tail_need
-= skb_tailroom(skb
);
1276 tail_need
= max_t(int, tail_need
, 0);
1279 if (head_need
|| tail_need
) {
1280 /* Sorry. Can't account for this any more */
1284 if (skb_header_cloned(skb
))
1285 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1287 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1289 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1290 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1291 wiphy_name(local
->hw
.wiphy
));
1295 /* update truesize too */
1296 skb
->truesize
+= head_need
+ tail_need
;
1301 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1303 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1304 struct ieee80211_local
*local
= mpriv
->local
;
1305 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1306 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1307 struct net_device
*odev
= NULL
;
1308 struct ieee80211_sub_if_data
*osdata
;
1315 } monitor_iface
= NOT_MONITOR
;
1319 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1320 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1324 if (unlikely(!odev
)) {
1325 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1326 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1327 "originating device\n", dev
->name
);
1333 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1334 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1335 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1336 ieee80211_stop_queues_by_reason(&local
->hw
,
1337 IEEE80211_QUEUE_STOP_REASON_PS
);
1338 queue_work(local
->hw
.workqueue
,
1339 &local
->dynamic_ps_disable_work
);
1342 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1343 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1346 memset(info
, 0, sizeof(*info
));
1348 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1350 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1352 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1353 ieee80211_is_data(hdr
->frame_control
)) {
1354 if (is_multicast_ether_addr(hdr
->addr3
))
1355 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1357 if (mesh_nexthop_lookup(skb
, osdata
)) {
1361 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1362 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1364 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1365 struct ieee80211_sub_if_data
*sdata
;
1369 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1370 monitor_iface
= UNKNOWN_ADDRESS
;
1372 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1373 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1374 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1376 /* check the header is complete in the frame */
1377 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1379 * We process outgoing injected frames that have a
1380 * local address we handle as though they are our
1382 * This code here isn't entirely correct, the local
1383 * MAC address is not necessarily enough to find
1384 * the interface to use; for that proper VLAN/WDS
1385 * support we will need a different mechanism.
1389 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1391 if (!netif_running(sdata
->dev
))
1393 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1395 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1397 dev_hold(sdata
->dev
);
1401 skb
->iif
= sdata
->dev
->ifindex
;
1402 monitor_iface
= FOUND_SDATA
;
1410 may_encrypt
= !skb
->do_not_encrypt
;
1412 headroom
= osdata
->local
->tx_headroom
;
1414 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1415 headroom
-= skb_headroom(skb
);
1416 headroom
= max_t(int, 0, headroom
);
1418 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1424 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1425 osdata
= container_of(osdata
->bss
,
1426 struct ieee80211_sub_if_data
,
1428 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1429 info
->control
.vif
= &osdata
->vif
;
1430 ret
= ieee80211_tx(odev
, skb
);
1436 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1437 struct net_device
*dev
)
1439 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1440 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1441 struct ieee80211_radiotap_header
*prthdr
=
1442 (struct ieee80211_radiotap_header
*)skb
->data
;
1446 * Frame injection is not allowed if beaconing is not allowed
1447 * or if we need radar detection. Beaconing is usually not allowed when
1448 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1449 * Passive scan is also used in world regulatory domains where
1450 * your country is not known and as such it should be treated as
1451 * NO TX unless the channel is explicitly allowed in which case
1452 * your current regulatory domain would not have the passive scan
1455 * Since AP mode uses monitor interfaces to inject/TX management
1456 * frames we can make AP mode the exception to this rule once it
1457 * supports radar detection as its implementation can deal with
1458 * radar detection by itself. We can do that later by adding a
1459 * monitor flag interfaces used for AP support.
1461 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1462 IEEE80211_CHAN_PASSIVE_SCAN
)))
1465 /* check for not even having the fixed radiotap header part */
1466 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1467 goto fail
; /* too short to be possibly valid */
1469 /* is it a header version we can trust to find length from? */
1470 if (unlikely(prthdr
->it_version
))
1471 goto fail
; /* only version 0 is supported */
1473 /* then there must be a radiotap header with a length we can use */
1474 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1476 /* does the skb contain enough to deliver on the alleged length? */
1477 if (unlikely(skb
->len
< len_rthdr
))
1478 goto fail
; /* skb too short for claimed rt header extent */
1480 skb
->dev
= local
->mdev
;
1482 /* needed because we set skb device to master */
1483 skb
->iif
= dev
->ifindex
;
1485 /* sometimes we do encrypt injected frames, will be fixed
1486 * up in radiotap parser if not wanted */
1487 skb
->do_not_encrypt
= 0;
1490 * fix up the pointers accounting for the radiotap
1491 * header still being in there. We are being given
1492 * a precooked IEEE80211 header so no need for
1495 skb_set_mac_header(skb
, len_rthdr
);
1497 * these are just fixed to the end of the rt area since we
1498 * don't have any better information and at this point, nobody cares
1500 skb_set_network_header(skb
, len_rthdr
);
1501 skb_set_transport_header(skb
, len_rthdr
);
1503 /* pass the radiotap header up to the next stage intact */
1504 dev_queue_xmit(skb
);
1505 return NETDEV_TX_OK
;
1509 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1513 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1514 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1515 * @skb: packet to be sent
1516 * @dev: incoming interface
1518 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1519 * not be freed, and caller is responsible for either retrying later or freeing
1522 * This function takes in an Ethernet header and encapsulates it with suitable
1523 * IEEE 802.11 header based on which interface the packet is coming in. The
1524 * encapsulated packet will then be passed to master interface, wlan#.11, for
1525 * transmission (through low-level driver).
1527 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1528 struct net_device
*dev
)
1530 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1531 struct ieee80211_local
*local
= sdata
->local
;
1532 int ret
= 1, head_need
;
1533 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1535 struct ieee80211_hdr hdr
;
1536 struct ieee80211s_hdr mesh_hdr
;
1537 const u8
*encaps_data
;
1538 int encaps_len
, skip_header_bytes
;
1540 struct sta_info
*sta
;
1543 if (unlikely(skb
->len
< ETH_HLEN
)) {
1548 nh_pos
= skb_network_header(skb
) - skb
->data
;
1549 h_pos
= skb_transport_header(skb
) - skb
->data
;
1551 /* convert Ethernet header to proper 802.11 header (based on
1552 * operation mode) */
1553 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1554 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1556 switch (sdata
->vif
.type
) {
1557 case NL80211_IFTYPE_AP
:
1558 case NL80211_IFTYPE_AP_VLAN
:
1559 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1561 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1562 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1563 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1566 case NL80211_IFTYPE_WDS
:
1567 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1569 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1570 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1571 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1572 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1575 #ifdef CONFIG_MAC80211_MESH
1576 case NL80211_IFTYPE_MESH_POINT
:
1577 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1578 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1579 /* Do not send frames with mesh_ttl == 0 */
1580 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1584 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1586 if (compare_ether_addr(dev
->dev_addr
,
1587 skb
->data
+ ETH_ALEN
) == 0) {
1589 memset(hdr
.addr1
, 0, ETH_ALEN
);
1590 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1591 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1592 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1593 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1595 /* packet from other interface */
1596 struct mesh_path
*mppath
;
1598 memset(hdr
.addr1
, 0, ETH_ALEN
);
1599 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1600 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1602 if (is_multicast_ether_addr(skb
->data
))
1603 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1606 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1608 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1610 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1614 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1615 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1616 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1617 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1618 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1619 sdata
->u
.mesh
.mesh_seqnum
++;
1625 case NL80211_IFTYPE_STATION
:
1626 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1628 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1629 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1630 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1633 case NL80211_IFTYPE_ADHOC
:
1635 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1636 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1637 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1646 * There's no need to try to look up the destination
1647 * if it is a multicast address (which can only happen
1650 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1652 sta
= sta_info_get(local
, hdr
.addr1
);
1654 sta_flags
= get_sta_flags(sta
);
1658 /* receiver and we are QoS enabled, use a QoS type frame */
1659 if (sta_flags
& WLAN_STA_WME
&&
1660 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1661 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1666 * Drop unicast frames to unauthorised stations unless they are
1667 * EAPOL frames from the local station.
1669 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1670 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1671 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1672 !(ethertype
== ETH_P_PAE
&&
1673 compare_ether_addr(dev
->dev_addr
,
1674 skb
->data
+ ETH_ALEN
) == 0))) {
1675 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1676 if (net_ratelimit())
1677 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1678 " (unauthorized port)\n", dev
->name
,
1682 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1688 hdr
.frame_control
= fc
;
1689 hdr
.duration_id
= 0;
1692 skip_header_bytes
= ETH_HLEN
;
1693 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1694 encaps_data
= bridge_tunnel_header
;
1695 encaps_len
= sizeof(bridge_tunnel_header
);
1696 skip_header_bytes
-= 2;
1697 } else if (ethertype
>= 0x600) {
1698 encaps_data
= rfc1042_header
;
1699 encaps_len
= sizeof(rfc1042_header
);
1700 skip_header_bytes
-= 2;
1706 skb_pull(skb
, skip_header_bytes
);
1707 nh_pos
-= skip_header_bytes
;
1708 h_pos
-= skip_header_bytes
;
1710 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1713 * So we need to modify the skb header and hence need a copy of
1714 * that. The head_need variable above doesn't, so far, include
1715 * the needed header space that we don't need right away. If we
1716 * can, then we don't reallocate right now but only after the
1717 * frame arrives at the master device (if it does...)
1719 * If we cannot, however, then we will reallocate to include all
1720 * the ever needed space. Also, if we need to reallocate it anyway,
1721 * make it big enough for everything we may ever need.
1724 if (head_need
> 0 || skb_cloned(skb
)) {
1725 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1726 head_need
+= local
->tx_headroom
;
1727 head_need
= max_t(int, 0, head_need
);
1728 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1733 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1734 nh_pos
+= encaps_len
;
1735 h_pos
+= encaps_len
;
1738 if (meshhdrlen
> 0) {
1739 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1740 nh_pos
+= meshhdrlen
;
1741 h_pos
+= meshhdrlen
;
1744 if (ieee80211_is_data_qos(fc
)) {
1745 __le16
*qos_control
;
1747 qos_control
= (__le16
*) skb_push(skb
, 2);
1748 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1750 * Maybe we could actually set some fields here, for now just
1751 * initialise to zero to indicate no special operation.
1755 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1760 skb
->iif
= dev
->ifindex
;
1762 skb
->dev
= local
->mdev
;
1763 dev
->stats
.tx_packets
++;
1764 dev
->stats
.tx_bytes
+= skb
->len
;
1766 /* Update skb pointers to various headers since this modified frame
1767 * is going to go through Linux networking code that may potentially
1768 * need things like pointer to IP header. */
1769 skb_set_mac_header(skb
, 0);
1770 skb_set_network_header(skb
, nh_pos
);
1771 skb_set_transport_header(skb
, h_pos
);
1773 dev
->trans_start
= jiffies
;
1774 dev_queue_xmit(skb
);
1787 * ieee80211_clear_tx_pending may not be called in a context where
1788 * it is possible that it packets could come in again.
1790 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1793 struct ieee80211_tx_stored_packet
*store
;
1795 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1796 if (!test_bit(i
, local
->queues_pending
))
1798 store
= &local
->pending_packet
[i
];
1799 kfree_skb(store
->skb
);
1800 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1801 kfree_skb(store
->extra_frag
[j
]);
1802 kfree(store
->extra_frag
);
1803 clear_bit(i
, local
->queues_pending
);
1808 * Transmit all pending packets. Called from tasklet, locks master device
1809 * TX lock so that no new packets can come in.
1811 void ieee80211_tx_pending(unsigned long data
)
1813 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1814 struct net_device
*dev
= local
->mdev
;
1815 struct ieee80211_tx_stored_packet
*store
;
1816 struct ieee80211_tx_data tx
;
1819 netif_tx_lock_bh(dev
);
1820 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1821 /* Check that this queue is ok */
1822 if (__netif_subqueue_stopped(local
->mdev
, i
) &&
1823 !test_bit(i
, local
->queues_pending_run
))
1826 if (!test_bit(i
, local
->queues_pending
)) {
1827 clear_bit(i
, local
->queues_pending_run
);
1828 ieee80211_wake_queue(&local
->hw
, i
);
1832 clear_bit(i
, local
->queues_pending_run
);
1833 netif_start_subqueue(local
->mdev
, i
);
1835 store
= &local
->pending_packet
[i
];
1836 tx
.extra_frag
= store
->extra_frag
;
1837 tx
.num_extra_frag
= store
->num_extra_frag
;
1839 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1841 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1844 clear_bit(i
, local
->queues_pending
);
1845 ieee80211_wake_queue(&local
->hw
, i
);
1848 netif_tx_unlock_bh(dev
);
1851 /* functions for drivers to get certain frames */
1853 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1854 struct sk_buff
*skb
,
1855 struct beacon_data
*beacon
)
1859 int i
, have_bits
= 0, n1
, n2
;
1861 /* Generate bitmap for TIM only if there are any STAs in power save
1863 if (atomic_read(&bss
->num_sta_ps
) > 0)
1864 /* in the hope that this is faster than
1865 * checking byte-for-byte */
1866 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1867 IEEE80211_MAX_AID
+1);
1869 if (bss
->dtim_count
== 0)
1870 bss
->dtim_count
= beacon
->dtim_period
- 1;
1874 tim
= pos
= (u8
*) skb_put(skb
, 6);
1875 *pos
++ = WLAN_EID_TIM
;
1877 *pos
++ = bss
->dtim_count
;
1878 *pos
++ = beacon
->dtim_period
;
1880 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1884 /* Find largest even number N1 so that bits numbered 1 through
1885 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1886 * (N2 + 1) x 8 through 2007 are 0. */
1888 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1895 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1902 /* Bitmap control */
1904 /* Part Virt Bitmap */
1905 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1907 tim
[1] = n2
- n1
+ 4;
1908 skb_put(skb
, n2
- n1
);
1910 *pos
++ = aid0
; /* Bitmap control */
1911 *pos
++ = 0; /* Part Virt Bitmap */
1915 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1916 struct ieee80211_vif
*vif
)
1918 struct ieee80211_local
*local
= hw_to_local(hw
);
1919 struct sk_buff
*skb
= NULL
;
1920 struct ieee80211_tx_info
*info
;
1921 struct ieee80211_sub_if_data
*sdata
= NULL
;
1922 struct ieee80211_if_ap
*ap
= NULL
;
1923 struct ieee80211_if_sta
*ifsta
= NULL
;
1924 struct beacon_data
*beacon
;
1925 struct ieee80211_supported_band
*sband
;
1926 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1928 sband
= local
->hw
.wiphy
->bands
[band
];
1932 sdata
= vif_to_sdata(vif
);
1934 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1936 beacon
= rcu_dereference(ap
->beacon
);
1939 * headroom, head length,
1940 * tail length and maximum TIM length
1942 skb
= dev_alloc_skb(local
->tx_headroom
+
1944 beacon
->tail_len
+ 256);
1948 skb_reserve(skb
, local
->tx_headroom
);
1949 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1953 * Not very nice, but we want to allow the driver to call
1954 * ieee80211_beacon_get() as a response to the set_tim()
1955 * callback. That, however, is already invoked under the
1956 * sta_lock to guarantee consistent and race-free update
1957 * of the tim bitmap in mac80211 and the driver.
1959 if (local
->tim_in_locked_section
) {
1960 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1962 unsigned long flags
;
1964 spin_lock_irqsave(&local
->sta_lock
, flags
);
1965 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1966 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1970 memcpy(skb_put(skb
, beacon
->tail_len
),
1971 beacon
->tail
, beacon
->tail_len
);
1974 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1975 struct ieee80211_hdr
*hdr
;
1976 ifsta
= &sdata
->u
.sta
;
1978 if (!ifsta
->probe_resp
)
1981 skb
= skb_copy(ifsta
->probe_resp
, GFP_ATOMIC
);
1985 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1986 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1987 IEEE80211_STYPE_BEACON
);
1989 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1990 struct ieee80211_mgmt
*mgmt
;
1993 /* headroom, head length, tail length and maximum TIM length */
1994 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1998 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1999 mgmt
= (struct ieee80211_mgmt
*)
2000 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2001 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2002 mgmt
->frame_control
=
2003 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2004 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2005 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2006 /* BSSID is left zeroed, wildcard value */
2007 mgmt
->u
.beacon
.beacon_int
=
2008 cpu_to_le16(local
->hw
.conf
.beacon_int
);
2009 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2011 pos
= skb_put(skb
, 2);
2012 *pos
++ = WLAN_EID_SSID
;
2015 mesh_mgmt_ies_add(skb
, sdata
);
2021 info
= IEEE80211_SKB_CB(skb
);
2023 skb
->do_not_encrypt
= 1;
2027 * XXX: For now, always use the lowest rate
2029 info
->control
.rates
[0].idx
= 0;
2030 info
->control
.rates
[0].count
= 1;
2031 info
->control
.rates
[1].idx
= -1;
2032 info
->control
.rates
[2].idx
= -1;
2033 info
->control
.rates
[3].idx
= -1;
2034 info
->control
.rates
[4].idx
= -1;
2035 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2037 info
->control
.vif
= vif
;
2039 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2040 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2041 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2046 EXPORT_SYMBOL(ieee80211_beacon_get
);
2048 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2049 const void *frame
, size_t frame_len
,
2050 const struct ieee80211_tx_info
*frame_txctl
,
2051 struct ieee80211_rts
*rts
)
2053 const struct ieee80211_hdr
*hdr
= frame
;
2055 rts
->frame_control
=
2056 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2057 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2059 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2060 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2062 EXPORT_SYMBOL(ieee80211_rts_get
);
2064 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2065 const void *frame
, size_t frame_len
,
2066 const struct ieee80211_tx_info
*frame_txctl
,
2067 struct ieee80211_cts
*cts
)
2069 const struct ieee80211_hdr
*hdr
= frame
;
2071 cts
->frame_control
=
2072 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2073 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2074 frame_len
, frame_txctl
);
2075 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2077 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2080 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2081 struct ieee80211_vif
*vif
)
2083 struct ieee80211_local
*local
= hw_to_local(hw
);
2084 struct sk_buff
*skb
= NULL
;
2085 struct sta_info
*sta
;
2086 struct ieee80211_tx_data tx
;
2087 struct ieee80211_sub_if_data
*sdata
;
2088 struct ieee80211_if_ap
*bss
= NULL
;
2089 struct beacon_data
*beacon
;
2090 struct ieee80211_tx_info
*info
;
2092 sdata
= vif_to_sdata(vif
);
2099 beacon
= rcu_dereference(bss
->beacon
);
2101 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2104 if (bss
->dtim_count
!= 0)
2105 goto out
; /* send buffered bc/mc only after DTIM beacon */
2108 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2111 local
->total_ps_buffered
--;
2113 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2114 struct ieee80211_hdr
*hdr
=
2115 (struct ieee80211_hdr
*) skb
->data
;
2116 /* more buffered multicast/broadcast frames ==> set
2117 * MoreData flag in IEEE 802.11 header to inform PS
2119 hdr
->frame_control
|=
2120 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2123 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2125 dev_kfree_skb_any(skb
);
2128 info
= IEEE80211_SKB_CB(skb
);
2131 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2132 tx
.channel
= local
->hw
.conf
.channel
;
2133 info
->band
= tx
.channel
->band
;
2135 if (invoke_tx_handlers(&tx
))
2142 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);