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_PENDING 2
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
49 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
51 /* assume HW handles this */
52 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
56 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
59 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
60 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
62 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
65 * data and mgmt (except PS Poll):
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
81 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
82 if (ieee80211_is_ctl(hdr
->frame_control
)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
95 * PS Poll: BIT(15) | BIT(14) | aid
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr
) /* Group address as the destination - no ACK */
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
118 /* use lowest available if everything fails */
119 mrate
= sband
->bitrates
[0].bitrate
;
120 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
121 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
123 if (r
->bitrate
> txrate
->bitrate
)
126 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
129 switch (sband
->band
) {
130 case IEEE80211_BAND_2GHZ
: {
132 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
133 flag
= IEEE80211_RATE_MANDATORY_G
;
135 flag
= IEEE80211_RATE_MANDATORY_B
;
140 case IEEE80211_BAND_5GHZ
:
141 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
144 case IEEE80211_NUM_BANDS
:
150 /* No matching basic rate found; use highest suitable mandatory
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
160 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur
*= 2; /* ACK + SIFS */
167 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
168 txrate
->bitrate
, erp
,
169 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
172 return cpu_to_le16(dur
);
175 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
176 struct net_device
*dev
)
178 return local
== wdev_priv(dev
->ieee80211_ptr
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
187 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
188 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
191 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
194 if (unlikely(tx
->local
->sw_scanning
) &&
195 !ieee80211_is_probe_req(hdr
->frame_control
) &&
196 !ieee80211_is_nullfunc(hdr
->frame_control
))
198 * When software scanning only nullfunc frames (to notify
199 * the sleep state to the AP) and probe requests (for the
200 * active scan) are allowed, all other frames should not be
201 * sent and we should not get here, but if we do
202 * nonetheless, drop them to avoid sending them
203 * off-channel. See the link below and
204 * ieee80211_start_scan() for more.
206 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
210 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
213 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
216 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
218 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
219 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
220 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
221 ieee80211_is_data(hdr
->frame_control
))) {
222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
223 printk(KERN_DEBUG
"%s: dropped data frame to not "
224 "associated station %pM\n",
225 tx
->dev
->name
, hdr
->addr1
);
226 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
227 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
231 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
232 tx
->local
->num_sta
== 0 &&
233 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
235 * No associated STAs - no need to send multicast
246 /* This function is called whenever the AP is about to exceed the maximum limit
247 * of buffered frames for power saving STAs. This situation should not really
248 * happen often during normal operation, so dropping the oldest buffered packet
249 * from each queue should be OK to make some room for new frames. */
250 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
252 int total
= 0, purged
= 0;
254 struct ieee80211_sub_if_data
*sdata
;
255 struct sta_info
*sta
;
258 * virtual interfaces are protected by RCU
262 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
263 struct ieee80211_if_ap
*ap
;
264 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
267 skb
= skb_dequeue(&ap
->ps_bc_buf
);
272 total
+= skb_queue_len(&ap
->ps_bc_buf
);
275 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
276 skb
= skb_dequeue(&sta
->ps_tx_buf
);
281 total
+= skb_queue_len(&sta
->ps_tx_buf
);
286 local
->total_ps_buffered
= total
;
287 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
288 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
289 wiphy_name(local
->hw
.wiphy
), purged
);
293 static ieee80211_tx_result
294 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
296 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
297 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
300 * broadcast/multicast frame
302 * If any of the associated stations is in power save mode,
303 * the frame is buffered to be sent after DTIM beacon frame.
304 * This is done either by the hardware or us.
307 /* powersaving STAs only in AP/VLAN mode */
311 /* no buffering for ordered frames */
312 if (ieee80211_has_order(hdr
->frame_control
))
315 /* no stations in PS mode */
316 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
319 /* buffered in mac80211 */
320 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
321 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
322 purge_old_ps_buffers(tx
->local
);
323 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
325 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
326 if (net_ratelimit()) {
327 printk(KERN_DEBUG
"%s: BC TX buffer full - "
328 "dropping the oldest frame\n",
332 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
334 tx
->local
->total_ps_buffered
++;
335 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
339 /* buffered in hardware */
340 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
345 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
348 if (!ieee80211_is_mgmt(fc
))
351 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
354 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
361 static ieee80211_tx_result
362 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
364 struct sta_info
*sta
= tx
->sta
;
365 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
366 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
369 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
372 staflags
= get_sta_flags(sta
);
374 if (unlikely((staflags
& WLAN_STA_PS
) &&
375 !(staflags
& WLAN_STA_PSPOLL
))) {
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
379 sta
->sta
.addr
, sta
->sta
.aid
,
380 skb_queue_len(&sta
->ps_tx_buf
));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
383 purge_old_ps_buffers(tx
->local
);
384 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
385 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
386 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG
"%s: STA %pM TX "
389 "buffer full - dropping oldest frame\n",
390 tx
->dev
->name
, sta
->sta
.addr
);
395 tx
->local
->total_ps_buffered
++;
397 /* Queue frame to be sent after STA sends an PS Poll frame */
398 if (skb_queue_empty(&sta
->ps_tx_buf
))
399 sta_info_set_tim_bit(sta
);
401 info
->control
.jiffies
= jiffies
;
402 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
407 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
408 "set -> send frame\n", tx
->dev
->name
,
411 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
412 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
417 static ieee80211_tx_result debug_noinline
418 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
420 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
423 if (tx
->flags
& IEEE80211_TX_UNICAST
)
424 return ieee80211_tx_h_unicast_ps_buf(tx
);
426 return ieee80211_tx_h_multicast_ps_buf(tx
);
429 static ieee80211_tx_result debug_noinline
430 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
432 struct ieee80211_key
*key
;
433 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
434 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
436 if (unlikely(tx
->skb
->do_not_encrypt
))
438 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
440 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
441 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
443 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
445 else if (tx
->sdata
->drop_unencrypted
&&
446 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
447 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
448 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
449 (ieee80211_is_action(hdr
->frame_control
) &&
450 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
451 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
457 tx
->key
->tx_rx_count
++;
458 /* TODO: add threshold stuff again */
460 switch (tx
->key
->conf
.alg
) {
462 if (ieee80211_is_auth(hdr
->frame_control
))
465 if (!ieee80211_is_data_present(hdr
->frame_control
))
469 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
470 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
475 if (!ieee80211_is_mgmt(hdr
->frame_control
))
481 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
482 tx
->skb
->do_not_encrypt
= 1;
487 static ieee80211_tx_result debug_noinline
488 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
490 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
491 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
492 struct ieee80211_supported_band
*sband
;
493 struct ieee80211_rate
*rate
;
495 bool inval
= false, rts
= false, short_preamble
= false;
496 struct ieee80211_tx_rate_control txrc
;
498 memset(&txrc
, 0, sizeof(txrc
));
500 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
502 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
503 tx
->local
->fragmentation_threshold
);
505 /* set up the tx rate control struct we give the RC algo */
506 txrc
.hw
= local_to_hw(tx
->local
);
508 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
510 txrc
.reported_rate
.idx
= -1;
511 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
513 /* set up RTS protection if desired */
514 if (tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
&&
515 len
> tx
->local
->rts_threshold
) {
516 txrc
.rts
= rts
= true;
520 * Use short preamble if the BSS can handle it, but not for
521 * management frames unless we know the receiver can handle
522 * that -- the management frame might be to a station that
523 * just wants a probe response.
525 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
526 (ieee80211_is_data(hdr
->frame_control
) ||
527 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
528 txrc
.short_preamble
= short_preamble
= true;
531 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
533 if (unlikely(info
->control
.rates
[0].idx
< 0))
536 if (txrc
.reported_rate
.idx
< 0)
537 txrc
.reported_rate
= info
->control
.rates
[0];
540 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
542 if (unlikely(!info
->control
.rates
[0].count
))
543 info
->control
.rates
[0].count
= 1;
545 if (is_multicast_ether_addr(hdr
->addr1
)) {
547 * XXX: verify the rate is in the basic rateset
553 * set up the RTS/CTS rate as the fastest basic rate
554 * that is not faster than the data rate
556 * XXX: Should this check all retry rates?
558 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
561 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
563 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
564 /* must be a basic rate */
565 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
567 /* must not be faster than the data rate */
568 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
571 if (sband
->bitrates
[baserate
].bitrate
<
572 sband
->bitrates
[i
].bitrate
)
576 info
->control
.rts_cts_rate_idx
= baserate
;
579 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
581 * make sure there's no valid rate following
582 * an invalid one, just in case drivers don't
583 * take the API seriously to stop at -1.
586 info
->control
.rates
[i
].idx
= -1;
589 if (info
->control
.rates
[i
].idx
< 0) {
595 * For now assume MCS is already set up correctly, this
598 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
599 WARN_ON(info
->control
.rates
[i
].idx
> 76);
603 /* set up RTS protection if desired */
605 info
->control
.rates
[i
].flags
|=
606 IEEE80211_TX_RC_USE_RTS_CTS
;
609 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
610 sband
->n_bitrates
)) {
611 info
->control
.rates
[i
].idx
= -1;
615 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
617 /* set up short preamble */
618 if (short_preamble
&&
619 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
620 info
->control
.rates
[i
].flags
|=
621 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
623 /* set up G protection */
624 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
625 rate
->flags
& IEEE80211_RATE_ERP_G
)
626 info
->control
.rates
[i
].flags
|=
627 IEEE80211_TX_RC_USE_CTS_PROTECT
;
633 static ieee80211_tx_result debug_noinline
634 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
636 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
639 info
->control
.sta
= &tx
->sta
->sta
;
644 static ieee80211_tx_result debug_noinline
645 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
647 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
648 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
654 * Packet injection may want to control the sequence
655 * number, if we have no matching interface then we
656 * neither assign one ourselves nor ask the driver to.
658 if (unlikely(!info
->control
.vif
))
661 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
664 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
668 * Anything but QoS data that has a sequence number field
669 * (is long enough) gets a sequence number from the global
672 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
673 /* driver should assign sequence number */
674 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
675 /* for pure STA mode without beacons, we can do it */
676 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
677 tx
->sdata
->sequence_number
+= 0x10;
678 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
683 * This should be true for injected/management frames only, for
684 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
685 * above since they are not QoS-data frames.
690 /* include per-STA, per-TID sequence counter */
692 qc
= ieee80211_get_qos_ctl(hdr
);
693 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
694 seq
= &tx
->sta
->tid_seq
[tid
];
696 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
698 /* Increase the sequence number. */
699 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
704 static int ieee80211_fragment(struct ieee80211_local
*local
,
705 struct sk_buff
*skb
, int hdrlen
,
708 struct sk_buff
*tail
= skb
, *tmp
;
709 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
710 int pos
= hdrlen
+ per_fragm
;
711 int rem
= skb
->len
- hdrlen
- per_fragm
;
713 if (WARN_ON(rem
< 0))
717 int fraglen
= per_fragm
;
722 tmp
= dev_alloc_skb(local
->tx_headroom
+
724 IEEE80211_ENCRYPT_HEADROOM
+
725 IEEE80211_ENCRYPT_TAILROOM
);
730 skb_reserve(tmp
, local
->tx_headroom
+
731 IEEE80211_ENCRYPT_HEADROOM
);
732 /* copy control information */
733 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
734 skb_copy_queue_mapping(tmp
, skb
);
735 tmp
->priority
= skb
->priority
;
736 tmp
->do_not_encrypt
= skb
->do_not_encrypt
;
740 /* copy header and data */
741 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
742 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
747 skb
->len
= hdrlen
+ per_fragm
;
751 static ieee80211_tx_result debug_noinline
752 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
754 struct sk_buff
*skb
= tx
->skb
;
755 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
756 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
757 int frag_threshold
= tx
->local
->fragmentation_threshold
;
761 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
765 * Warn when submitting a fragmented A-MPDU frame and drop it.
766 * This scenario is handled in __ieee80211_tx_prepare but extra
767 * caution taken here as fragmented ampdu may cause Tx stop.
769 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
772 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
774 /* internal error, why is TX_FRAGMENTED set? */
775 if (WARN_ON(skb
->len
<= frag_threshold
))
779 * Now fragment the frame. This will allocate all the fragments and
780 * chain them (using skb as the first fragment) to skb->next.
781 * During transmission, we will remove the successfully transmitted
782 * fragments from this list. When the low-level driver rejects one
783 * of the fragments then we will simply pretend to accept the skb
784 * but store it away as pending.
786 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
789 /* update duration/seq/flags of fragments */
793 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
795 hdr
= (void *)skb
->data
;
796 info
= IEEE80211_SKB_CB(skb
);
799 hdr
->frame_control
|= morefrags
;
800 next_len
= skb
->next
->len
;
802 * No multi-rate retries for fragmented frames, that
803 * would completely throw off the NAV at other STAs.
805 info
->control
.rates
[1].idx
= -1;
806 info
->control
.rates
[2].idx
= -1;
807 info
->control
.rates
[3].idx
= -1;
808 info
->control
.rates
[4].idx
= -1;
809 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
810 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
812 hdr
->frame_control
&= ~morefrags
;
815 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
816 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
818 } while ((skb
= skb
->next
));
823 static ieee80211_tx_result debug_noinline
824 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
829 switch (tx
->key
->conf
.alg
) {
831 return ieee80211_crypto_wep_encrypt(tx
);
833 return ieee80211_crypto_tkip_encrypt(tx
);
835 return ieee80211_crypto_ccmp_encrypt(tx
);
837 return ieee80211_crypto_aes_cmac_encrypt(tx
);
845 static ieee80211_tx_result debug_noinline
846 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
848 struct sk_buff
*skb
= tx
->skb
;
849 struct ieee80211_hdr
*hdr
;
854 hdr
= (void *) skb
->data
;
855 next_len
= skb
->next
? skb
->next
->len
: 0;
856 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
859 ieee80211_duration(tx
, group_addr
, next_len
);
860 } while ((skb
= skb
->next
));
865 static ieee80211_tx_result debug_noinline
866 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
868 struct sk_buff
*skb
= tx
->skb
;
873 tx
->sta
->tx_packets
++;
875 tx
->sta
->tx_fragments
++;
876 tx
->sta
->tx_bytes
+= skb
->len
;
877 } while ((skb
= skb
->next
));
882 /* actual transmit path */
885 * deal with packet injection down monitor interface
886 * with Radiotap Header -- only called for monitor mode interface
888 static ieee80211_tx_result
889 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
893 * this is the moment to interpret and discard the radiotap header that
894 * must be at the start of the packet injected in Monitor mode
896 * Need to take some care with endian-ness since radiotap
897 * args are little-endian
900 struct ieee80211_radiotap_iterator iterator
;
901 struct ieee80211_radiotap_header
*rthdr
=
902 (struct ieee80211_radiotap_header
*) skb
->data
;
903 struct ieee80211_supported_band
*sband
;
904 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
906 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
908 skb
->do_not_encrypt
= 1;
909 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
912 * for every radiotap entry that is present
913 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
914 * entries present, or -EINVAL on error)
918 ret
= ieee80211_radiotap_iterator_next(&iterator
);
923 /* see if this argument is something we can use */
924 switch (iterator
.this_arg_index
) {
926 * You must take care when dereferencing iterator.this_arg
927 * for multibyte types... the pointer is not aligned. Use
928 * get_unaligned((type *)iterator.this_arg) to dereference
929 * iterator.this_arg for type "type" safely on all arches.
931 case IEEE80211_RADIOTAP_FLAGS
:
932 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
934 * this indicates that the skb we have been
935 * handed has the 32-bit FCS CRC at the end...
936 * we should react to that by snipping it off
937 * because it will be recomputed and added
940 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
943 skb_trim(skb
, skb
->len
- FCS_LEN
);
945 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
946 tx
->skb
->do_not_encrypt
= 0;
947 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
948 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
952 * Please update the file
953 * Documentation/networking/mac80211-injection.txt
954 * when parsing new fields here.
962 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
966 * remove the radiotap header
967 * iterator->max_length was sanity-checked against
968 * skb->len by iterator init
970 skb_pull(skb
, iterator
.max_length
);
978 static ieee80211_tx_result
979 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
981 struct net_device
*dev
)
983 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
984 struct ieee80211_hdr
*hdr
;
985 struct ieee80211_sub_if_data
*sdata
;
986 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
991 memset(tx
, 0, sizeof(*tx
));
993 tx
->dev
= dev
; /* use original interface */
995 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
996 tx
->channel
= local
->hw
.conf
.channel
;
998 * Set this flag (used below to indicate "automatic fragmentation"),
999 * it will be cleared/left by radiotap as desired.
1001 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1003 /* process and remove the injection radiotap header */
1004 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1005 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1006 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1010 * __ieee80211_parse_tx_radiotap has now removed
1011 * the radiotap header that was present and pre-filled
1012 * 'tx' with tx control information.
1016 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1018 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1020 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1021 unsigned long flags
;
1022 qc
= ieee80211_get_qos_ctl(hdr
);
1023 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1025 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1026 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1027 if (*state
== HT_AGG_STATE_OPERATIONAL
)
1028 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1029 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1032 if (is_multicast_ether_addr(hdr
->addr1
)) {
1033 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1034 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1036 tx
->flags
|= IEEE80211_TX_UNICAST
;
1037 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1040 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1041 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1042 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1043 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1044 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1046 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1050 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1051 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1052 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1054 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1055 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1056 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1057 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1059 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1065 * NB: @tx is uninitialised when passed in here
1067 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1068 struct ieee80211_tx_data
*tx
,
1069 struct sk_buff
*skb
)
1071 struct net_device
*dev
;
1073 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1074 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1080 /* initialises tx with control */
1081 __ieee80211_tx_prepare(tx
, skb
, dev
);
1086 static int __ieee80211_tx(struct ieee80211_local
*local
,
1087 struct ieee80211_tx_data
*tx
)
1089 struct sk_buff
*skb
= tx
->skb
, *next
;
1090 struct ieee80211_tx_info
*info
;
1094 local
->mdev
->trans_start
= jiffies
;
1097 if (ieee80211_queue_stopped(&local
->hw
,
1098 skb_get_queue_mapping(skb
)))
1099 return IEEE80211_TX_PENDING
;
1101 info
= IEEE80211_SKB_CB(skb
);
1104 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1105 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1108 * Internally, we need to have the queue mapping point to
1109 * the real AC queue, not the virtual A-MPDU queue. This
1110 * now finally sets the queue to what the driver wants.
1111 * We will later move this down into the only driver that
1112 * needs it, iwlwifi.
1114 if (tx
->sta
&& local
->hw
.ampdu_queues
&&
1115 info
->flags
& IEEE80211_TX_CTL_AMPDU
) {
1116 unsigned long flags
;
1117 u8
*qc
= ieee80211_get_qos_ctl((void *) skb
->data
);
1118 int tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1120 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1121 skb_set_queue_mapping(skb
, local
->hw
.queues
+
1122 tx
->sta
->tid_to_tx_q
[tid
]);
1123 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1127 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1128 if (ret
!= NETDEV_TX_OK
)
1129 return IEEE80211_TX_AGAIN
;
1130 tx
->skb
= skb
= next
;
1131 ieee80211_led_tx(local
, 1);
1135 return IEEE80211_TX_OK
;
1139 * Invoke TX handlers, return 0 on success and non-zero if the
1140 * frame was dropped or queued.
1142 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1144 struct sk_buff
*skb
= tx
->skb
;
1145 ieee80211_tx_result res
= TX_DROP
;
1147 #define CALL_TXH(txh) \
1149 if (res != TX_CONTINUE) \
1152 CALL_TXH(ieee80211_tx_h_check_assoc
)
1153 CALL_TXH(ieee80211_tx_h_ps_buf
)
1154 CALL_TXH(ieee80211_tx_h_select_key
)
1155 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1156 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1157 CALL_TXH(ieee80211_tx_h_misc
)
1158 CALL_TXH(ieee80211_tx_h_sequence
)
1159 CALL_TXH(ieee80211_tx_h_fragment
)
1160 /* handlers after fragment must be aware of tx info fragmentation! */
1161 CALL_TXH(ieee80211_tx_h_encrypt
)
1162 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1163 CALL_TXH(ieee80211_tx_h_stats
)
1167 if (unlikely(res
== TX_DROP
)) {
1168 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1170 struct sk_buff
*next
;
1177 } else if (unlikely(res
== TX_QUEUED
)) {
1178 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1185 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1187 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1188 struct sta_info
*sta
;
1189 struct ieee80211_tx_data tx
;
1190 ieee80211_tx_result res_prepare
;
1191 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1192 struct sk_buff
*next
;
1193 unsigned long flags
;
1197 queue
= skb_get_queue_mapping(skb
);
1199 WARN_ON(!skb_queue_empty(&local
->pending
[queue
]));
1201 if (unlikely(skb
->len
< 10)) {
1208 /* initialises tx */
1209 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1211 if (res_prepare
== TX_DROP
) {
1218 tx
.channel
= local
->hw
.conf
.channel
;
1219 info
->band
= tx
.channel
->band
;
1221 if (invoke_tx_handlers(&tx
))
1226 ret
= __ieee80211_tx(local
, &tx
);
1228 case IEEE80211_TX_OK
:
1230 case IEEE80211_TX_AGAIN
:
1232 * Since there are no fragmented frames on A-MPDU
1233 * queues, there's no reason for a driver to reject
1234 * a frame there, warn and drop it.
1236 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1239 case IEEE80211_TX_PENDING
:
1242 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1244 if (__netif_subqueue_stopped(local
->mdev
, queue
)) {
1248 skb_queue_tail(&local
->pending
[queue
], skb
);
1249 } while ((skb
= next
));
1252 * Make sure nobody will enable the queue on us
1253 * (without going through the tasklet) nor disable the
1254 * netdev queue underneath the pending handling code.
1256 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING
,
1257 &local
->queue_stop_reasons
[queue
]);
1259 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1262 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1266 if (WARN(retries
> 10, "tx refused but queue active"))
1287 /* device xmit handlers */
1289 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1290 struct sk_buff
*skb
,
1291 int head_need
, bool may_encrypt
)
1296 * This could be optimised, devices that do full hardware
1297 * crypto (including TKIP MMIC) need no tailroom... But we
1298 * have no drivers for such devices currently.
1301 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1302 tail_need
-= skb_tailroom(skb
);
1303 tail_need
= max_t(int, tail_need
, 0);
1306 if (head_need
|| tail_need
) {
1307 /* Sorry. Can't account for this any more */
1311 if (skb_header_cloned(skb
))
1312 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1314 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1316 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1317 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1318 wiphy_name(local
->hw
.wiphy
));
1322 /* update truesize too */
1323 skb
->truesize
+= head_need
+ tail_need
;
1328 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1330 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1331 struct ieee80211_local
*local
= mpriv
->local
;
1332 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1333 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1334 struct net_device
*odev
= NULL
;
1335 struct ieee80211_sub_if_data
*osdata
;
1342 } monitor_iface
= NOT_MONITOR
;
1346 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1347 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1351 if (unlikely(!odev
)) {
1352 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1353 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1354 "originating device\n", dev
->name
);
1360 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1361 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1362 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1363 ieee80211_stop_queues_by_reason(&local
->hw
,
1364 IEEE80211_QUEUE_STOP_REASON_PS
);
1365 queue_work(local
->hw
.workqueue
,
1366 &local
->dynamic_ps_disable_work
);
1369 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1370 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1373 memset(info
, 0, sizeof(*info
));
1375 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1377 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1379 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1380 ieee80211_is_data(hdr
->frame_control
)) {
1381 if (is_multicast_ether_addr(hdr
->addr3
))
1382 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1384 if (mesh_nexthop_lookup(skb
, osdata
)) {
1388 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1389 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1391 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1392 struct ieee80211_sub_if_data
*sdata
;
1396 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1397 monitor_iface
= UNKNOWN_ADDRESS
;
1399 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1400 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1401 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1403 /* check the header is complete in the frame */
1404 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1406 * We process outgoing injected frames that have a
1407 * local address we handle as though they are our
1409 * This code here isn't entirely correct, the local
1410 * MAC address is not necessarily enough to find
1411 * the interface to use; for that proper VLAN/WDS
1412 * support we will need a different mechanism.
1416 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1418 if (!netif_running(sdata
->dev
))
1420 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1422 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1424 dev_hold(sdata
->dev
);
1428 skb
->iif
= sdata
->dev
->ifindex
;
1429 monitor_iface
= FOUND_SDATA
;
1437 may_encrypt
= !skb
->do_not_encrypt
;
1439 headroom
= osdata
->local
->tx_headroom
;
1441 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1442 headroom
-= skb_headroom(skb
);
1443 headroom
= max_t(int, 0, headroom
);
1445 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1451 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1452 osdata
= container_of(osdata
->bss
,
1453 struct ieee80211_sub_if_data
,
1455 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1456 info
->control
.vif
= &osdata
->vif
;
1457 ret
= ieee80211_tx(odev
, skb
);
1463 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1464 struct net_device
*dev
)
1466 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1467 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1468 struct ieee80211_radiotap_header
*prthdr
=
1469 (struct ieee80211_radiotap_header
*)skb
->data
;
1473 * Frame injection is not allowed if beaconing is not allowed
1474 * or if we need radar detection. Beaconing is usually not allowed when
1475 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1476 * Passive scan is also used in world regulatory domains where
1477 * your country is not known and as such it should be treated as
1478 * NO TX unless the channel is explicitly allowed in which case
1479 * your current regulatory domain would not have the passive scan
1482 * Since AP mode uses monitor interfaces to inject/TX management
1483 * frames we can make AP mode the exception to this rule once it
1484 * supports radar detection as its implementation can deal with
1485 * radar detection by itself. We can do that later by adding a
1486 * monitor flag interfaces used for AP support.
1488 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1489 IEEE80211_CHAN_PASSIVE_SCAN
)))
1492 /* check for not even having the fixed radiotap header part */
1493 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1494 goto fail
; /* too short to be possibly valid */
1496 /* is it a header version we can trust to find length from? */
1497 if (unlikely(prthdr
->it_version
))
1498 goto fail
; /* only version 0 is supported */
1500 /* then there must be a radiotap header with a length we can use */
1501 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1503 /* does the skb contain enough to deliver on the alleged length? */
1504 if (unlikely(skb
->len
< len_rthdr
))
1505 goto fail
; /* skb too short for claimed rt header extent */
1507 skb
->dev
= local
->mdev
;
1509 /* needed because we set skb device to master */
1510 skb
->iif
= dev
->ifindex
;
1512 /* sometimes we do encrypt injected frames, will be fixed
1513 * up in radiotap parser if not wanted */
1514 skb
->do_not_encrypt
= 0;
1517 * fix up the pointers accounting for the radiotap
1518 * header still being in there. We are being given
1519 * a precooked IEEE80211 header so no need for
1522 skb_set_mac_header(skb
, len_rthdr
);
1524 * these are just fixed to the end of the rt area since we
1525 * don't have any better information and at this point, nobody cares
1527 skb_set_network_header(skb
, len_rthdr
);
1528 skb_set_transport_header(skb
, len_rthdr
);
1530 /* pass the radiotap header up to the next stage intact */
1531 dev_queue_xmit(skb
);
1532 return NETDEV_TX_OK
;
1536 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1540 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1541 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1542 * @skb: packet to be sent
1543 * @dev: incoming interface
1545 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1546 * not be freed, and caller is responsible for either retrying later or freeing
1549 * This function takes in an Ethernet header and encapsulates it with suitable
1550 * IEEE 802.11 header based on which interface the packet is coming in. The
1551 * encapsulated packet will then be passed to master interface, wlan#.11, for
1552 * transmission (through low-level driver).
1554 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1555 struct net_device
*dev
)
1557 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1558 struct ieee80211_local
*local
= sdata
->local
;
1559 int ret
= 1, head_need
;
1560 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1562 struct ieee80211_hdr hdr
;
1563 struct ieee80211s_hdr mesh_hdr
;
1564 const u8
*encaps_data
;
1565 int encaps_len
, skip_header_bytes
;
1567 struct sta_info
*sta
;
1570 if (unlikely(skb
->len
< ETH_HLEN
)) {
1575 nh_pos
= skb_network_header(skb
) - skb
->data
;
1576 h_pos
= skb_transport_header(skb
) - skb
->data
;
1578 /* convert Ethernet header to proper 802.11 header (based on
1579 * operation mode) */
1580 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1581 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1583 switch (sdata
->vif
.type
) {
1584 case NL80211_IFTYPE_AP
:
1585 case NL80211_IFTYPE_AP_VLAN
:
1586 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1588 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1589 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1590 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1593 case NL80211_IFTYPE_WDS
:
1594 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1596 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1597 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1598 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1599 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1602 #ifdef CONFIG_MAC80211_MESH
1603 case NL80211_IFTYPE_MESH_POINT
:
1604 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1605 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1606 /* Do not send frames with mesh_ttl == 0 */
1607 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1611 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1613 if (compare_ether_addr(dev
->dev_addr
,
1614 skb
->data
+ ETH_ALEN
) == 0) {
1616 memset(hdr
.addr1
, 0, ETH_ALEN
);
1617 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1618 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1619 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1620 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1622 /* packet from other interface */
1623 struct mesh_path
*mppath
;
1625 memset(hdr
.addr1
, 0, ETH_ALEN
);
1626 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1627 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1629 if (is_multicast_ether_addr(skb
->data
))
1630 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1633 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1635 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1637 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1641 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1642 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1643 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1644 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1645 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1646 sdata
->u
.mesh
.mesh_seqnum
++;
1652 case NL80211_IFTYPE_STATION
:
1653 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1655 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1656 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1657 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1660 case NL80211_IFTYPE_ADHOC
:
1662 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1663 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1664 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1673 * There's no need to try to look up the destination
1674 * if it is a multicast address (which can only happen
1677 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1679 sta
= sta_info_get(local
, hdr
.addr1
);
1681 sta_flags
= get_sta_flags(sta
);
1685 /* receiver and we are QoS enabled, use a QoS type frame */
1686 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1687 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1692 * Drop unicast frames to unauthorised stations unless they are
1693 * EAPOL frames from the local station.
1695 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1696 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1697 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1698 !(ethertype
== ETH_P_PAE
&&
1699 compare_ether_addr(dev
->dev_addr
,
1700 skb
->data
+ ETH_ALEN
) == 0))) {
1701 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1702 if (net_ratelimit())
1703 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1704 " (unauthorized port)\n", dev
->name
,
1708 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1714 hdr
.frame_control
= fc
;
1715 hdr
.duration_id
= 0;
1718 skip_header_bytes
= ETH_HLEN
;
1719 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1720 encaps_data
= bridge_tunnel_header
;
1721 encaps_len
= sizeof(bridge_tunnel_header
);
1722 skip_header_bytes
-= 2;
1723 } else if (ethertype
>= 0x600) {
1724 encaps_data
= rfc1042_header
;
1725 encaps_len
= sizeof(rfc1042_header
);
1726 skip_header_bytes
-= 2;
1732 skb_pull(skb
, skip_header_bytes
);
1733 nh_pos
-= skip_header_bytes
;
1734 h_pos
-= skip_header_bytes
;
1736 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1739 * So we need to modify the skb header and hence need a copy of
1740 * that. The head_need variable above doesn't, so far, include
1741 * the needed header space that we don't need right away. If we
1742 * can, then we don't reallocate right now but only after the
1743 * frame arrives at the master device (if it does...)
1745 * If we cannot, however, then we will reallocate to include all
1746 * the ever needed space. Also, if we need to reallocate it anyway,
1747 * make it big enough for everything we may ever need.
1750 if (head_need
> 0 || skb_cloned(skb
)) {
1751 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1752 head_need
+= local
->tx_headroom
;
1753 head_need
= max_t(int, 0, head_need
);
1754 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1759 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1760 nh_pos
+= encaps_len
;
1761 h_pos
+= encaps_len
;
1764 if (meshhdrlen
> 0) {
1765 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1766 nh_pos
+= meshhdrlen
;
1767 h_pos
+= meshhdrlen
;
1770 if (ieee80211_is_data_qos(fc
)) {
1771 __le16
*qos_control
;
1773 qos_control
= (__le16
*) skb_push(skb
, 2);
1774 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1776 * Maybe we could actually set some fields here, for now just
1777 * initialise to zero to indicate no special operation.
1781 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1786 skb
->iif
= dev
->ifindex
;
1788 skb
->dev
= local
->mdev
;
1789 dev
->stats
.tx_packets
++;
1790 dev
->stats
.tx_bytes
+= skb
->len
;
1792 /* Update skb pointers to various headers since this modified frame
1793 * is going to go through Linux networking code that may potentially
1794 * need things like pointer to IP header. */
1795 skb_set_mac_header(skb
, 0);
1796 skb_set_network_header(skb
, nh_pos
);
1797 skb_set_transport_header(skb
, h_pos
);
1799 dev
->trans_start
= jiffies
;
1800 dev_queue_xmit(skb
);
1813 * ieee80211_clear_tx_pending may not be called in a context where
1814 * it is possible that it packets could come in again.
1816 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1820 for (i
= 0; i
< local
->hw
.queues
; i
++)
1821 skb_queue_purge(&local
->pending
[i
]);
1825 * Transmit all pending packets. Called from tasklet, locks master device
1826 * TX lock so that no new packets can come in.
1828 void ieee80211_tx_pending(unsigned long data
)
1830 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1831 struct net_device
*dev
= local
->mdev
;
1832 struct ieee80211_hdr
*hdr
;
1833 unsigned long flags
;
1834 struct ieee80211_tx_data tx
;
1839 netif_tx_lock_bh(dev
);
1841 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1843 * If queue is stopped by something other than due to pending
1844 * frames, or we have no pending frames, proceed to next queue.
1846 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1848 if (local
->queue_stop_reasons
[i
] !=
1849 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING
) ||
1850 skb_queue_empty(&local
->pending
[i
]))
1852 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1858 * start the queue now to allow processing our packets,
1859 * we're under the tx lock here anyway so nothing will
1860 * happen as a result of this
1862 netif_start_subqueue(local
->mdev
, i
);
1864 while (!skb_queue_empty(&local
->pending
[i
])) {
1866 tx
.skb
= skb_dequeue(&local
->pending
[i
]);
1867 hdr
= (struct ieee80211_hdr
*)tx
.skb
->data
;
1868 tx
.sta
= sta_info_get(local
, hdr
->addr1
);
1870 ret
= __ieee80211_tx(local
, &tx
);
1871 if (ret
!= IEEE80211_TX_OK
) {
1872 skb_queue_head(&local
->pending
[i
], tx
.skb
);
1877 /* Start regular packet processing again. */
1878 if (skb_queue_empty(&local
->pending
[i
]))
1879 ieee80211_wake_queue_by_reason(&local
->hw
, i
,
1880 IEEE80211_QUEUE_STOP_REASON_PENDING
);
1883 netif_tx_unlock_bh(dev
);
1887 /* functions for drivers to get certain frames */
1889 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1890 struct sk_buff
*skb
,
1891 struct beacon_data
*beacon
)
1895 int i
, have_bits
= 0, n1
, n2
;
1897 /* Generate bitmap for TIM only if there are any STAs in power save
1899 if (atomic_read(&bss
->num_sta_ps
) > 0)
1900 /* in the hope that this is faster than
1901 * checking byte-for-byte */
1902 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1903 IEEE80211_MAX_AID
+1);
1905 if (bss
->dtim_count
== 0)
1906 bss
->dtim_count
= beacon
->dtim_period
- 1;
1910 tim
= pos
= (u8
*) skb_put(skb
, 6);
1911 *pos
++ = WLAN_EID_TIM
;
1913 *pos
++ = bss
->dtim_count
;
1914 *pos
++ = beacon
->dtim_period
;
1916 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1920 /* Find largest even number N1 so that bits numbered 1 through
1921 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1922 * (N2 + 1) x 8 through 2007 are 0. */
1924 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1931 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1938 /* Bitmap control */
1940 /* Part Virt Bitmap */
1941 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1943 tim
[1] = n2
- n1
+ 4;
1944 skb_put(skb
, n2
- n1
);
1946 *pos
++ = aid0
; /* Bitmap control */
1947 *pos
++ = 0; /* Part Virt Bitmap */
1951 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1952 struct ieee80211_vif
*vif
)
1954 struct ieee80211_local
*local
= hw_to_local(hw
);
1955 struct sk_buff
*skb
= NULL
;
1956 struct ieee80211_tx_info
*info
;
1957 struct ieee80211_sub_if_data
*sdata
= NULL
;
1958 struct ieee80211_if_ap
*ap
= NULL
;
1959 struct beacon_data
*beacon
;
1960 struct ieee80211_supported_band
*sband
;
1961 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1963 sband
= local
->hw
.wiphy
->bands
[band
];
1967 sdata
= vif_to_sdata(vif
);
1969 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1971 beacon
= rcu_dereference(ap
->beacon
);
1974 * headroom, head length,
1975 * tail length and maximum TIM length
1977 skb
= dev_alloc_skb(local
->tx_headroom
+
1979 beacon
->tail_len
+ 256);
1983 skb_reserve(skb
, local
->tx_headroom
);
1984 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1988 * Not very nice, but we want to allow the driver to call
1989 * ieee80211_beacon_get() as a response to the set_tim()
1990 * callback. That, however, is already invoked under the
1991 * sta_lock to guarantee consistent and race-free update
1992 * of the tim bitmap in mac80211 and the driver.
1994 if (local
->tim_in_locked_section
) {
1995 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1997 unsigned long flags
;
1999 spin_lock_irqsave(&local
->sta_lock
, flags
);
2000 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2001 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2005 memcpy(skb_put(skb
, beacon
->tail_len
),
2006 beacon
->tail
, beacon
->tail_len
);
2009 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2010 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2011 struct ieee80211_hdr
*hdr
;
2013 if (!ifibss
->probe_resp
)
2016 skb
= skb_copy(ifibss
->probe_resp
, GFP_ATOMIC
);
2020 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2021 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2022 IEEE80211_STYPE_BEACON
);
2024 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2025 struct ieee80211_mgmt
*mgmt
;
2028 /* headroom, head length, tail length and maximum TIM length */
2029 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2033 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2034 mgmt
= (struct ieee80211_mgmt
*)
2035 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2036 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2037 mgmt
->frame_control
=
2038 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2039 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2040 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2041 /* BSSID is left zeroed, wildcard value */
2042 mgmt
->u
.beacon
.beacon_int
=
2043 cpu_to_le16(local
->hw
.conf
.beacon_int
);
2044 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2046 pos
= skb_put(skb
, 2);
2047 *pos
++ = WLAN_EID_SSID
;
2050 mesh_mgmt_ies_add(skb
, sdata
);
2056 info
= IEEE80211_SKB_CB(skb
);
2058 skb
->do_not_encrypt
= 1;
2062 * XXX: For now, always use the lowest rate
2064 info
->control
.rates
[0].idx
= 0;
2065 info
->control
.rates
[0].count
= 1;
2066 info
->control
.rates
[1].idx
= -1;
2067 info
->control
.rates
[2].idx
= -1;
2068 info
->control
.rates
[3].idx
= -1;
2069 info
->control
.rates
[4].idx
= -1;
2070 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2072 info
->control
.vif
= vif
;
2074 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2075 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2076 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2081 EXPORT_SYMBOL(ieee80211_beacon_get
);
2083 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2084 const void *frame
, size_t frame_len
,
2085 const struct ieee80211_tx_info
*frame_txctl
,
2086 struct ieee80211_rts
*rts
)
2088 const struct ieee80211_hdr
*hdr
= frame
;
2090 rts
->frame_control
=
2091 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2092 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2094 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2095 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2097 EXPORT_SYMBOL(ieee80211_rts_get
);
2099 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2100 const void *frame
, size_t frame_len
,
2101 const struct ieee80211_tx_info
*frame_txctl
,
2102 struct ieee80211_cts
*cts
)
2104 const struct ieee80211_hdr
*hdr
= frame
;
2106 cts
->frame_control
=
2107 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2108 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2109 frame_len
, frame_txctl
);
2110 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2112 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2115 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2116 struct ieee80211_vif
*vif
)
2118 struct ieee80211_local
*local
= hw_to_local(hw
);
2119 struct sk_buff
*skb
= NULL
;
2120 struct sta_info
*sta
;
2121 struct ieee80211_tx_data tx
;
2122 struct ieee80211_sub_if_data
*sdata
;
2123 struct ieee80211_if_ap
*bss
= NULL
;
2124 struct beacon_data
*beacon
;
2125 struct ieee80211_tx_info
*info
;
2127 sdata
= vif_to_sdata(vif
);
2134 beacon
= rcu_dereference(bss
->beacon
);
2136 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2139 if (bss
->dtim_count
!= 0)
2140 goto out
; /* send buffered bc/mc only after DTIM beacon */
2143 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2146 local
->total_ps_buffered
--;
2148 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2149 struct ieee80211_hdr
*hdr
=
2150 (struct ieee80211_hdr
*) skb
->data
;
2151 /* more buffered multicast/broadcast frames ==> set
2152 * MoreData flag in IEEE 802.11 header to inform PS
2154 hdr
->frame_control
|=
2155 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2158 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2160 dev_kfree_skb_any(skb
);
2163 info
= IEEE80211_SKB_CB(skb
);
2166 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2167 tx
.channel
= local
->hw
.conf
.channel
;
2168 info
->band
= tx
.channel
->band
;
2170 if (invoke_tx_handlers(&tx
))
2177 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);