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
;
879 /* actual transmit path */
882 * deal with packet injection down monitor interface
883 * with Radiotap Header -- only called for monitor mode interface
885 static ieee80211_tx_result
886 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
890 * this is the moment to interpret and discard the radiotap header that
891 * must be at the start of the packet injected in Monitor mode
893 * Need to take some care with endian-ness since radiotap
894 * args are little-endian
897 struct ieee80211_radiotap_iterator iterator
;
898 struct ieee80211_radiotap_header
*rthdr
=
899 (struct ieee80211_radiotap_header
*) skb
->data
;
900 struct ieee80211_supported_band
*sband
;
901 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
903 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
905 skb
->do_not_encrypt
= 1;
906 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
909 * for every radiotap entry that is present
910 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
911 * entries present, or -EINVAL on error)
915 ret
= ieee80211_radiotap_iterator_next(&iterator
);
920 /* see if this argument is something we can use */
921 switch (iterator
.this_arg_index
) {
923 * You must take care when dereferencing iterator.this_arg
924 * for multibyte types... the pointer is not aligned. Use
925 * get_unaligned((type *)iterator.this_arg) to dereference
926 * iterator.this_arg for type "type" safely on all arches.
928 case IEEE80211_RADIOTAP_FLAGS
:
929 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
931 * this indicates that the skb we have been
932 * handed has the 32-bit FCS CRC at the end...
933 * we should react to that by snipping it off
934 * because it will be recomputed and added
937 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
940 skb_trim(skb
, skb
->len
- FCS_LEN
);
942 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
943 tx
->skb
->do_not_encrypt
= 0;
944 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
945 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
949 * Please update the file
950 * Documentation/networking/mac80211-injection.txt
951 * when parsing new fields here.
959 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
963 * remove the radiotap header
964 * iterator->max_length was sanity-checked against
965 * skb->len by iterator init
967 skb_pull(skb
, iterator
.max_length
);
975 static ieee80211_tx_result
976 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
978 struct net_device
*dev
)
980 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
981 struct ieee80211_hdr
*hdr
;
982 struct ieee80211_sub_if_data
*sdata
;
983 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
988 memset(tx
, 0, sizeof(*tx
));
990 tx
->dev
= dev
; /* use original interface */
992 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
993 tx
->channel
= local
->hw
.conf
.channel
;
995 * Set this flag (used below to indicate "automatic fragmentation"),
996 * it will be cleared/left by radiotap as desired.
998 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1000 /* process and remove the injection radiotap header */
1001 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1002 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1003 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1007 * __ieee80211_parse_tx_radiotap has now removed
1008 * the radiotap header that was present and pre-filled
1009 * 'tx' with tx control information.
1013 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1015 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1017 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1018 unsigned long flags
;
1019 qc
= ieee80211_get_qos_ctl(hdr
);
1020 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1022 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1023 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1024 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1025 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1026 if (local
->hw
.ampdu_queues
)
1027 skb_set_queue_mapping(
1028 skb
, tx
->local
->hw
.queues
+
1029 tx
->sta
->tid_to_tx_q
[tid
]);
1031 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1034 if (is_multicast_ether_addr(hdr
->addr1
)) {
1035 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1036 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1038 tx
->flags
|= IEEE80211_TX_UNICAST
;
1039 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1042 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1043 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1044 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1045 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1046 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1048 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1052 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1053 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1054 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1056 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1057 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1058 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1059 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1061 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1067 * NB: @tx is uninitialised when passed in here
1069 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1070 struct ieee80211_tx_data
*tx
,
1071 struct sk_buff
*skb
)
1073 struct net_device
*dev
;
1075 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1076 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1082 /* initialises tx with control */
1083 __ieee80211_tx_prepare(tx
, skb
, dev
);
1088 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1089 struct ieee80211_tx_data
*tx
)
1091 struct ieee80211_tx_info
*info
;
1095 if (ieee80211_queue_stopped(&local
->hw
,
1096 skb_get_queue_mapping(skb
)))
1097 return IEEE80211_TX_PENDING
;
1099 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1101 return IEEE80211_TX_AGAIN
;
1102 local
->mdev
->trans_start
= jiffies
;
1103 ieee80211_led_tx(local
, 1);
1105 if (tx
->extra_frag
) {
1106 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1107 if (!tx
->extra_frag
[i
])
1109 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1110 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1111 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1112 if (ieee80211_queue_stopped(&local
->hw
,
1113 skb_get_queue_mapping(tx
->extra_frag
[i
])))
1114 return IEEE80211_TX_FRAG_AGAIN
;
1116 ret
= local
->ops
->tx(local_to_hw(local
),
1119 return IEEE80211_TX_FRAG_AGAIN
;
1120 local
->mdev
->trans_start
= jiffies
;
1121 ieee80211_led_tx(local
, 1);
1122 tx
->extra_frag
[i
] = NULL
;
1124 kfree(tx
->extra_frag
);
1125 tx
->extra_frag
= NULL
;
1127 return IEEE80211_TX_OK
;
1131 * Invoke TX handlers, return 0 on success and non-zero if the
1132 * frame was dropped or queued.
1134 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1136 struct sk_buff
*skb
= tx
->skb
;
1137 ieee80211_tx_result res
= TX_DROP
;
1140 #define CALL_TXH(txh) \
1142 if (res != TX_CONTINUE) \
1145 CALL_TXH(ieee80211_tx_h_check_assoc
)
1146 CALL_TXH(ieee80211_tx_h_ps_buf
)
1147 CALL_TXH(ieee80211_tx_h_select_key
)
1148 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1149 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1150 CALL_TXH(ieee80211_tx_h_misc
)
1151 CALL_TXH(ieee80211_tx_h_sequence
)
1152 CALL_TXH(ieee80211_tx_h_fragment
)
1153 /* handlers after fragment must be aware of tx info fragmentation! */
1154 CALL_TXH(ieee80211_tx_h_encrypt
)
1155 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1156 CALL_TXH(ieee80211_tx_h_stats
)
1160 if (unlikely(res
== TX_DROP
)) {
1161 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1163 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1164 if (tx
->extra_frag
[i
])
1165 dev_kfree_skb(tx
->extra_frag
[i
]);
1166 kfree(tx
->extra_frag
);
1168 } else if (unlikely(res
== TX_QUEUED
)) {
1169 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1176 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1178 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1179 struct sta_info
*sta
;
1180 struct ieee80211_tx_data tx
;
1181 ieee80211_tx_result res_prepare
;
1182 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1186 queue
= skb_get_queue_mapping(skb
);
1188 WARN_ON(test_bit(queue
, local
->queues_pending
));
1190 if (unlikely(skb
->len
< 10)) {
1197 /* initialises tx */
1198 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1200 if (res_prepare
== TX_DROP
) {
1207 tx
.channel
= local
->hw
.conf
.channel
;
1208 info
->band
= tx
.channel
->band
;
1210 if (invoke_tx_handlers(&tx
))
1214 ret
= __ieee80211_tx(local
, skb
, &tx
);
1216 struct ieee80211_tx_stored_packet
*store
;
1219 * Since there are no fragmented frames on A-MPDU
1220 * queues, there's no reason for a driver to reject
1221 * a frame there, warn and drop it.
1223 if (ret
!= IEEE80211_TX_PENDING
)
1224 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1227 store
= &local
->pending_packet
[queue
];
1229 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1232 set_bit(queue
, local
->queues_pending
);
1235 * When the driver gets out of buffers during sending of
1236 * fragments and calls ieee80211_stop_queue, the netif
1237 * subqueue is stopped. There is, however, a small window
1238 * in which the PENDING bit is not yet set. If a buffer
1239 * gets available in that window (i.e. driver calls
1240 * ieee80211_wake_queue), we would end up with ieee80211_tx
1241 * called with the PENDING bit still set. Prevent this by
1242 * continuing transmitting here when that situation is
1243 * possible to have happened.
1245 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1246 clear_bit(queue
, local
->queues_pending
);
1250 store
->extra_frag
= tx
.extra_frag
;
1251 store
->num_extra_frag
= tx
.num_extra_frag
;
1260 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1261 if (tx
.extra_frag
[i
])
1262 dev_kfree_skb(tx
.extra_frag
[i
]);
1263 kfree(tx
.extra_frag
);
1268 /* device xmit handlers */
1270 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1271 struct sk_buff
*skb
,
1272 int head_need
, bool may_encrypt
)
1277 * This could be optimised, devices that do full hardware
1278 * crypto (including TKIP MMIC) need no tailroom... But we
1279 * have no drivers for such devices currently.
1282 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1283 tail_need
-= skb_tailroom(skb
);
1284 tail_need
= max_t(int, tail_need
, 0);
1287 if (head_need
|| tail_need
) {
1288 /* Sorry. Can't account for this any more */
1292 if (skb_header_cloned(skb
))
1293 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1295 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1297 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1298 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1299 wiphy_name(local
->hw
.wiphy
));
1303 /* update truesize too */
1304 skb
->truesize
+= head_need
+ tail_need
;
1309 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1311 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1312 struct ieee80211_local
*local
= mpriv
->local
;
1313 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1314 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1315 struct net_device
*odev
= NULL
;
1316 struct ieee80211_sub_if_data
*osdata
;
1323 } monitor_iface
= NOT_MONITOR
;
1327 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1328 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1332 if (unlikely(!odev
)) {
1333 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1334 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1335 "originating device\n", dev
->name
);
1341 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1342 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1343 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1344 ieee80211_stop_queues_by_reason(&local
->hw
,
1345 IEEE80211_QUEUE_STOP_REASON_PS
);
1346 queue_work(local
->hw
.workqueue
,
1347 &local
->dynamic_ps_disable_work
);
1350 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1351 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1354 memset(info
, 0, sizeof(*info
));
1356 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1358 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1360 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1361 ieee80211_is_data(hdr
->frame_control
)) {
1362 if (is_multicast_ether_addr(hdr
->addr3
))
1363 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1365 if (mesh_nexthop_lookup(skb
, osdata
)) {
1369 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1370 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1372 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1373 struct ieee80211_sub_if_data
*sdata
;
1377 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1378 monitor_iface
= UNKNOWN_ADDRESS
;
1380 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1381 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1382 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1384 /* check the header is complete in the frame */
1385 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1387 * We process outgoing injected frames that have a
1388 * local address we handle as though they are our
1390 * This code here isn't entirely correct, the local
1391 * MAC address is not necessarily enough to find
1392 * the interface to use; for that proper VLAN/WDS
1393 * support we will need a different mechanism.
1397 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1399 if (!netif_running(sdata
->dev
))
1401 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1403 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1405 dev_hold(sdata
->dev
);
1409 skb
->iif
= sdata
->dev
->ifindex
;
1410 monitor_iface
= FOUND_SDATA
;
1418 may_encrypt
= !skb
->do_not_encrypt
;
1420 headroom
= osdata
->local
->tx_headroom
;
1422 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1423 headroom
-= skb_headroom(skb
);
1424 headroom
= max_t(int, 0, headroom
);
1426 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1432 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1433 osdata
= container_of(osdata
->bss
,
1434 struct ieee80211_sub_if_data
,
1436 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1437 info
->control
.vif
= &osdata
->vif
;
1438 ret
= ieee80211_tx(odev
, skb
);
1444 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1445 struct net_device
*dev
)
1447 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1448 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1449 struct ieee80211_radiotap_header
*prthdr
=
1450 (struct ieee80211_radiotap_header
*)skb
->data
;
1454 * Frame injection is not allowed if beaconing is not allowed
1455 * or if we need radar detection. Beaconing is usually not allowed when
1456 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1457 * Passive scan is also used in world regulatory domains where
1458 * your country is not known and as such it should be treated as
1459 * NO TX unless the channel is explicitly allowed in which case
1460 * your current regulatory domain would not have the passive scan
1463 * Since AP mode uses monitor interfaces to inject/TX management
1464 * frames we can make AP mode the exception to this rule once it
1465 * supports radar detection as its implementation can deal with
1466 * radar detection by itself. We can do that later by adding a
1467 * monitor flag interfaces used for AP support.
1469 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1470 IEEE80211_CHAN_PASSIVE_SCAN
)))
1473 /* check for not even having the fixed radiotap header part */
1474 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1475 goto fail
; /* too short to be possibly valid */
1477 /* is it a header version we can trust to find length from? */
1478 if (unlikely(prthdr
->it_version
))
1479 goto fail
; /* only version 0 is supported */
1481 /* then there must be a radiotap header with a length we can use */
1482 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1484 /* does the skb contain enough to deliver on the alleged length? */
1485 if (unlikely(skb
->len
< len_rthdr
))
1486 goto fail
; /* skb too short for claimed rt header extent */
1488 skb
->dev
= local
->mdev
;
1490 /* needed because we set skb device to master */
1491 skb
->iif
= dev
->ifindex
;
1493 /* sometimes we do encrypt injected frames, will be fixed
1494 * up in radiotap parser if not wanted */
1495 skb
->do_not_encrypt
= 0;
1498 * fix up the pointers accounting for the radiotap
1499 * header still being in there. We are being given
1500 * a precooked IEEE80211 header so no need for
1503 skb_set_mac_header(skb
, len_rthdr
);
1505 * these are just fixed to the end of the rt area since we
1506 * don't have any better information and at this point, nobody cares
1508 skb_set_network_header(skb
, len_rthdr
);
1509 skb_set_transport_header(skb
, len_rthdr
);
1511 /* pass the radiotap header up to the next stage intact */
1512 dev_queue_xmit(skb
);
1513 return NETDEV_TX_OK
;
1517 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1521 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1522 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1523 * @skb: packet to be sent
1524 * @dev: incoming interface
1526 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1527 * not be freed, and caller is responsible for either retrying later or freeing
1530 * This function takes in an Ethernet header and encapsulates it with suitable
1531 * IEEE 802.11 header based on which interface the packet is coming in. The
1532 * encapsulated packet will then be passed to master interface, wlan#.11, for
1533 * transmission (through low-level driver).
1535 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1536 struct net_device
*dev
)
1538 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1539 struct ieee80211_local
*local
= sdata
->local
;
1540 int ret
= 1, head_need
;
1541 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1543 struct ieee80211_hdr hdr
;
1544 struct ieee80211s_hdr mesh_hdr
;
1545 const u8
*encaps_data
;
1546 int encaps_len
, skip_header_bytes
;
1548 struct sta_info
*sta
;
1551 if (unlikely(skb
->len
< ETH_HLEN
)) {
1556 nh_pos
= skb_network_header(skb
) - skb
->data
;
1557 h_pos
= skb_transport_header(skb
) - skb
->data
;
1559 /* convert Ethernet header to proper 802.11 header (based on
1560 * operation mode) */
1561 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1562 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1564 switch (sdata
->vif
.type
) {
1565 case NL80211_IFTYPE_AP
:
1566 case NL80211_IFTYPE_AP_VLAN
:
1567 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1569 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1570 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1571 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1574 case NL80211_IFTYPE_WDS
:
1575 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1577 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1578 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1579 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1580 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1583 #ifdef CONFIG_MAC80211_MESH
1584 case NL80211_IFTYPE_MESH_POINT
:
1585 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1586 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1587 /* Do not send frames with mesh_ttl == 0 */
1588 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1592 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1594 if (compare_ether_addr(dev
->dev_addr
,
1595 skb
->data
+ ETH_ALEN
) == 0) {
1597 memset(hdr
.addr1
, 0, ETH_ALEN
);
1598 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1599 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1600 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1601 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1603 /* packet from other interface */
1604 struct mesh_path
*mppath
;
1606 memset(hdr
.addr1
, 0, ETH_ALEN
);
1607 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1608 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1610 if (is_multicast_ether_addr(skb
->data
))
1611 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1614 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1616 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1618 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1622 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1623 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1624 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1625 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1626 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1627 sdata
->u
.mesh
.mesh_seqnum
++;
1633 case NL80211_IFTYPE_STATION
:
1634 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1636 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1637 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1638 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1641 case NL80211_IFTYPE_ADHOC
:
1643 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1644 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1645 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1654 * There's no need to try to look up the destination
1655 * if it is a multicast address (which can only happen
1658 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1660 sta
= sta_info_get(local
, hdr
.addr1
);
1662 sta_flags
= get_sta_flags(sta
);
1666 /* receiver and we are QoS enabled, use a QoS type frame */
1667 if (sta_flags
& WLAN_STA_WME
&&
1668 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1669 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1674 * Drop unicast frames to unauthorised stations unless they are
1675 * EAPOL frames from the local station.
1677 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1678 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1679 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1680 !(ethertype
== ETH_P_PAE
&&
1681 compare_ether_addr(dev
->dev_addr
,
1682 skb
->data
+ ETH_ALEN
) == 0))) {
1683 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1684 if (net_ratelimit())
1685 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1686 " (unauthorized port)\n", dev
->name
,
1690 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1696 hdr
.frame_control
= fc
;
1697 hdr
.duration_id
= 0;
1700 skip_header_bytes
= ETH_HLEN
;
1701 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1702 encaps_data
= bridge_tunnel_header
;
1703 encaps_len
= sizeof(bridge_tunnel_header
);
1704 skip_header_bytes
-= 2;
1705 } else if (ethertype
>= 0x600) {
1706 encaps_data
= rfc1042_header
;
1707 encaps_len
= sizeof(rfc1042_header
);
1708 skip_header_bytes
-= 2;
1714 skb_pull(skb
, skip_header_bytes
);
1715 nh_pos
-= skip_header_bytes
;
1716 h_pos
-= skip_header_bytes
;
1718 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1721 * So we need to modify the skb header and hence need a copy of
1722 * that. The head_need variable above doesn't, so far, include
1723 * the needed header space that we don't need right away. If we
1724 * can, then we don't reallocate right now but only after the
1725 * frame arrives at the master device (if it does...)
1727 * If we cannot, however, then we will reallocate to include all
1728 * the ever needed space. Also, if we need to reallocate it anyway,
1729 * make it big enough for everything we may ever need.
1732 if (head_need
> 0 || skb_cloned(skb
)) {
1733 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1734 head_need
+= local
->tx_headroom
;
1735 head_need
= max_t(int, 0, head_need
);
1736 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1741 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1742 nh_pos
+= encaps_len
;
1743 h_pos
+= encaps_len
;
1746 if (meshhdrlen
> 0) {
1747 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1748 nh_pos
+= meshhdrlen
;
1749 h_pos
+= meshhdrlen
;
1752 if (ieee80211_is_data_qos(fc
)) {
1753 __le16
*qos_control
;
1755 qos_control
= (__le16
*) skb_push(skb
, 2);
1756 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1758 * Maybe we could actually set some fields here, for now just
1759 * initialise to zero to indicate no special operation.
1763 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1768 skb
->iif
= dev
->ifindex
;
1770 skb
->dev
= local
->mdev
;
1771 dev
->stats
.tx_packets
++;
1772 dev
->stats
.tx_bytes
+= skb
->len
;
1774 /* Update skb pointers to various headers since this modified frame
1775 * is going to go through Linux networking code that may potentially
1776 * need things like pointer to IP header. */
1777 skb_set_mac_header(skb
, 0);
1778 skb_set_network_header(skb
, nh_pos
);
1779 skb_set_transport_header(skb
, h_pos
);
1781 dev
->trans_start
= jiffies
;
1782 dev_queue_xmit(skb
);
1795 * ieee80211_clear_tx_pending may not be called in a context where
1796 * it is possible that it packets could come in again.
1798 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1801 struct ieee80211_tx_stored_packet
*store
;
1803 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1804 if (!test_bit(i
, local
->queues_pending
))
1806 store
= &local
->pending_packet
[i
];
1807 kfree_skb(store
->skb
);
1808 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1809 kfree_skb(store
->extra_frag
[j
]);
1810 kfree(store
->extra_frag
);
1811 clear_bit(i
, local
->queues_pending
);
1816 * Transmit all pending packets. Called from tasklet, locks master device
1817 * TX lock so that no new packets can come in.
1819 void ieee80211_tx_pending(unsigned long data
)
1821 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1822 struct net_device
*dev
= local
->mdev
;
1823 struct ieee80211_tx_stored_packet
*store
;
1824 struct ieee80211_tx_data tx
;
1827 netif_tx_lock_bh(dev
);
1828 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1829 /* Check that this queue is ok */
1830 if (__netif_subqueue_stopped(local
->mdev
, i
) &&
1831 !test_bit(i
, local
->queues_pending_run
))
1834 if (!test_bit(i
, local
->queues_pending
)) {
1835 clear_bit(i
, local
->queues_pending_run
);
1836 ieee80211_wake_queue(&local
->hw
, i
);
1840 clear_bit(i
, local
->queues_pending_run
);
1841 netif_start_subqueue(local
->mdev
, i
);
1843 store
= &local
->pending_packet
[i
];
1844 tx
.extra_frag
= store
->extra_frag
;
1845 tx
.num_extra_frag
= store
->num_extra_frag
;
1847 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1849 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1852 clear_bit(i
, local
->queues_pending
);
1853 ieee80211_wake_queue(&local
->hw
, i
);
1856 netif_tx_unlock_bh(dev
);
1859 /* functions for drivers to get certain frames */
1861 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1862 struct sk_buff
*skb
,
1863 struct beacon_data
*beacon
)
1867 int i
, have_bits
= 0, n1
, n2
;
1869 /* Generate bitmap for TIM only if there are any STAs in power save
1871 if (atomic_read(&bss
->num_sta_ps
) > 0)
1872 /* in the hope that this is faster than
1873 * checking byte-for-byte */
1874 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1875 IEEE80211_MAX_AID
+1);
1877 if (bss
->dtim_count
== 0)
1878 bss
->dtim_count
= beacon
->dtim_period
- 1;
1882 tim
= pos
= (u8
*) skb_put(skb
, 6);
1883 *pos
++ = WLAN_EID_TIM
;
1885 *pos
++ = bss
->dtim_count
;
1886 *pos
++ = beacon
->dtim_period
;
1888 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1892 /* Find largest even number N1 so that bits numbered 1 through
1893 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1894 * (N2 + 1) x 8 through 2007 are 0. */
1896 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1903 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1910 /* Bitmap control */
1912 /* Part Virt Bitmap */
1913 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1915 tim
[1] = n2
- n1
+ 4;
1916 skb_put(skb
, n2
- n1
);
1918 *pos
++ = aid0
; /* Bitmap control */
1919 *pos
++ = 0; /* Part Virt Bitmap */
1923 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1924 struct ieee80211_vif
*vif
)
1926 struct ieee80211_local
*local
= hw_to_local(hw
);
1927 struct sk_buff
*skb
= NULL
;
1928 struct ieee80211_tx_info
*info
;
1929 struct ieee80211_sub_if_data
*sdata
= NULL
;
1930 struct ieee80211_if_ap
*ap
= NULL
;
1931 struct ieee80211_if_sta
*ifsta
= NULL
;
1932 struct beacon_data
*beacon
;
1933 struct ieee80211_supported_band
*sband
;
1934 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1936 sband
= local
->hw
.wiphy
->bands
[band
];
1940 sdata
= vif_to_sdata(vif
);
1942 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1944 beacon
= rcu_dereference(ap
->beacon
);
1947 * headroom, head length,
1948 * tail length and maximum TIM length
1950 skb
= dev_alloc_skb(local
->tx_headroom
+
1952 beacon
->tail_len
+ 256);
1956 skb_reserve(skb
, local
->tx_headroom
);
1957 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1961 * Not very nice, but we want to allow the driver to call
1962 * ieee80211_beacon_get() as a response to the set_tim()
1963 * callback. That, however, is already invoked under the
1964 * sta_lock to guarantee consistent and race-free update
1965 * of the tim bitmap in mac80211 and the driver.
1967 if (local
->tim_in_locked_section
) {
1968 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1970 unsigned long flags
;
1972 spin_lock_irqsave(&local
->sta_lock
, flags
);
1973 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1974 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1978 memcpy(skb_put(skb
, beacon
->tail_len
),
1979 beacon
->tail
, beacon
->tail_len
);
1982 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1983 struct ieee80211_hdr
*hdr
;
1984 ifsta
= &sdata
->u
.sta
;
1986 if (!ifsta
->probe_resp
)
1989 skb
= skb_copy(ifsta
->probe_resp
, GFP_ATOMIC
);
1993 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1994 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1995 IEEE80211_STYPE_BEACON
);
1997 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1998 struct ieee80211_mgmt
*mgmt
;
2001 /* headroom, head length, tail length and maximum TIM length */
2002 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2006 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2007 mgmt
= (struct ieee80211_mgmt
*)
2008 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2009 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2010 mgmt
->frame_control
=
2011 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2012 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2013 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2014 /* BSSID is left zeroed, wildcard value */
2015 mgmt
->u
.beacon
.beacon_int
=
2016 cpu_to_le16(local
->hw
.conf
.beacon_int
);
2017 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2019 pos
= skb_put(skb
, 2);
2020 *pos
++ = WLAN_EID_SSID
;
2023 mesh_mgmt_ies_add(skb
, sdata
);
2029 info
= IEEE80211_SKB_CB(skb
);
2031 skb
->do_not_encrypt
= 1;
2035 * XXX: For now, always use the lowest rate
2037 info
->control
.rates
[0].idx
= 0;
2038 info
->control
.rates
[0].count
= 1;
2039 info
->control
.rates
[1].idx
= -1;
2040 info
->control
.rates
[2].idx
= -1;
2041 info
->control
.rates
[3].idx
= -1;
2042 info
->control
.rates
[4].idx
= -1;
2043 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2045 info
->control
.vif
= vif
;
2047 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2048 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2049 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2054 EXPORT_SYMBOL(ieee80211_beacon_get
);
2056 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2057 const void *frame
, size_t frame_len
,
2058 const struct ieee80211_tx_info
*frame_txctl
,
2059 struct ieee80211_rts
*rts
)
2061 const struct ieee80211_hdr
*hdr
= frame
;
2063 rts
->frame_control
=
2064 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2065 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2067 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2068 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2070 EXPORT_SYMBOL(ieee80211_rts_get
);
2072 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2073 const void *frame
, size_t frame_len
,
2074 const struct ieee80211_tx_info
*frame_txctl
,
2075 struct ieee80211_cts
*cts
)
2077 const struct ieee80211_hdr
*hdr
= frame
;
2079 cts
->frame_control
=
2080 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2081 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2082 frame_len
, frame_txctl
);
2083 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2085 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2088 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2089 struct ieee80211_vif
*vif
)
2091 struct ieee80211_local
*local
= hw_to_local(hw
);
2092 struct sk_buff
*skb
= NULL
;
2093 struct sta_info
*sta
;
2094 struct ieee80211_tx_data tx
;
2095 struct ieee80211_sub_if_data
*sdata
;
2096 struct ieee80211_if_ap
*bss
= NULL
;
2097 struct beacon_data
*beacon
;
2098 struct ieee80211_tx_info
*info
;
2100 sdata
= vif_to_sdata(vif
);
2107 beacon
= rcu_dereference(bss
->beacon
);
2109 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2112 if (bss
->dtim_count
!= 0)
2113 goto out
; /* send buffered bc/mc only after DTIM beacon */
2116 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2119 local
->total_ps_buffered
--;
2121 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2122 struct ieee80211_hdr
*hdr
=
2123 (struct ieee80211_hdr
*) skb
->data
;
2124 /* more buffered multicast/broadcast frames ==> set
2125 * MoreData flag in IEEE 802.11 header to inform PS
2127 hdr
->frame_control
|=
2128 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2131 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2133 dev_kfree_skb_any(skb
);
2136 info
= IEEE80211_SKB_CB(skb
);
2139 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2140 tx
.channel
= local
->hw
.conf
.channel
;
2141 info
->band
= tx
.channel
->band
;
2143 if (invoke_tx_handlers(&tx
))
2150 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);