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"
28 #include "ieee80211_led.h"
32 #include "ieee80211_rate.h"
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
41 struct ieee80211_hdr
*hdr
)
43 /* Set the sequence number for this frame. */
44 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
46 /* Increase the sequence number. */
47 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
52 const struct sk_buff
*skb
)
54 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
59 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
65 fc
= le16_to_cpu(hdr
->frame_control
);
66 hdrlen
= ieee80211_get_hdrlen(fc
);
67 if (hdrlen
> skb
->len
)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc
, le16_to_cpu(hdr
->duration_id
));
73 printk(" A1=%s", print_mac(mac
, hdr
->addr1
));
75 printk(" A2=%s", print_mac(mac
, hdr
->addr2
));
77 printk(" A3=%s", print_mac(mac
, hdr
->addr3
));
79 printk(" A4=%s", print_mac(mac
, hdr
->addr4
));
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
92 int rate
, mrate
, erp
, dur
, i
;
93 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
94 struct ieee80211_local
*local
= tx
->local
;
95 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
97 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
117 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
130 * PS Poll: BIT(15) | BIT(14) | aid
136 if (0 /* FIX: data/mgmt during CFP */)
139 if (group_addr
) /* Group address as the destination - no ACK */
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
153 mrate
= 10; /* use 1 Mbps if everything fails */
154 for (i
= 0; i
< mode
->num_rates
; i
++) {
155 struct ieee80211_rate
*r
= &mode
->rates
[i
];
156 if (r
->rate
> txrate
->rate
)
159 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
160 IEEE80211_RATE_MODULATION(r
->flags
))
163 if (r
->flags
& IEEE80211_RATE_BASIC
)
165 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
169 /* No matching basic rate found; use highest suitable mandatory
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
178 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
179 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur
*= 2; /* ACK + SIFS */
186 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
189 IEEE80211_SDATA_SHORT_PREAMBLE
);
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
198 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
204 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
207 static int inline is_ieee80211_device(struct net_device
*dev
,
208 struct net_device
*master
)
210 return (wdev_priv(dev
->ieee80211_ptr
) ==
211 wdev_priv(master
->ieee80211_ptr
));
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff
*skb
= tx
->skb
;
221 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
225 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
226 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
227 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
230 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
231 return TXRX_CONTINUE
;
233 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
235 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
236 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
237 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
238 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
239 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
240 DECLARE_MAC_BUF(mac
);
241 printk(KERN_DEBUG
"%s: dropped data frame to not "
242 "associated station %s\n",
243 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
244 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
245 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
249 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
250 tx
->local
->num_sta
== 0 &&
251 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
253 * No associated STAs - no need to send multicast
258 return TXRX_CONTINUE
;
261 if (unlikely(!tx
->u
.tx
.mgmt_interface
&& tx
->sdata
->ieee802_1x
&&
262 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 DECLARE_MAC_BUF(mac
);
265 printk(KERN_DEBUG
"%s: dropped frame to %s"
266 " (unauthorized port)\n", tx
->dev
->name
,
267 print_mac(mac
, hdr
->addr1
));
269 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
273 return TXRX_CONTINUE
;
276 static ieee80211_txrx_result
277 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
279 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
281 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
282 ieee80211_include_sequence(tx
->sdata
, hdr
);
284 return TXRX_CONTINUE
;
287 /* This function is called whenever the AP is about to exceed the maximum limit
288 * of buffered frames for power saving STAs. This situation should not really
289 * happen often during normal operation, so dropping the oldest buffered packet
290 * from each queue should be OK to make some room for new frames. */
291 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
293 int total
= 0, purged
= 0;
295 struct ieee80211_sub_if_data
*sdata
;
296 struct sta_info
*sta
;
298 read_lock(&local
->sub_if_lock
);
299 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
300 struct ieee80211_if_ap
*ap
;
301 if (sdata
->dev
== local
->mdev
||
302 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
305 skb
= skb_dequeue(&ap
->ps_bc_buf
);
310 total
+= skb_queue_len(&ap
->ps_bc_buf
);
312 read_unlock(&local
->sub_if_lock
);
314 read_lock_bh(&local
->sta_lock
);
315 list_for_each_entry(sta
, &local
->sta_list
, list
) {
316 skb
= skb_dequeue(&sta
->ps_tx_buf
);
321 total
+= skb_queue_len(&sta
->ps_tx_buf
);
323 read_unlock_bh(&local
->sta_lock
);
325 local
->total_ps_buffered
= total
;
326 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
327 local
->mdev
->name
, purged
);
330 static inline ieee80211_txrx_result
331 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
333 /* broadcast/multicast frame */
334 /* If any of the associated stations is in power save mode,
335 * the frame is buffered to be sent after DTIM beacon frame */
336 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
337 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
338 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
339 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
340 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
341 purge_old_ps_buffers(tx
->local
);
342 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
344 if (net_ratelimit()) {
345 printk(KERN_DEBUG
"%s: BC TX buffer full - "
346 "dropping the oldest frame\n",
349 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
351 tx
->local
->total_ps_buffered
++;
352 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
356 return TXRX_CONTINUE
;
359 static inline ieee80211_txrx_result
360 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
362 struct sta_info
*sta
= tx
->sta
;
363 DECLARE_MAC_BUF(mac
);
366 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
367 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
368 return TXRX_CONTINUE
;
370 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
371 struct ieee80211_tx_packet_data
*pkt_data
;
372 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
373 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
375 print_mac(mac
, sta
->addr
), sta
->aid
,
376 skb_queue_len(&sta
->ps_tx_buf
));
377 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
378 sta
->flags
|= WLAN_STA_TIM
;
379 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
380 purge_old_ps_buffers(tx
->local
);
381 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
382 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
383 if (net_ratelimit()) {
384 printk(KERN_DEBUG
"%s: STA %s TX "
385 "buffer full - dropping oldest frame\n",
386 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
390 tx
->local
->total_ps_buffered
++;
391 /* Queue frame to be sent after STA sends an PS Poll frame */
392 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
393 if (tx
->local
->ops
->set_tim
)
394 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
397 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
399 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
400 pkt_data
->jiffies
= jiffies
;
401 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
404 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
405 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
406 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
407 "set -> send frame\n", tx
->dev
->name
,
408 print_mac(mac
, sta
->addr
));
410 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
413 return TXRX_CONTINUE
;
417 static ieee80211_txrx_result
418 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
420 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
421 return TXRX_CONTINUE
;
423 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
424 return ieee80211_tx_h_unicast_ps_buf(tx
);
426 return ieee80211_tx_h_multicast_ps_buf(tx
);
432 static ieee80211_txrx_result
433 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
435 struct ieee80211_key
*key
;
437 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
439 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
441 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
443 else if (tx
->sdata
->drop_unencrypted
&&
444 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
445 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
449 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
453 tx
->key
->tx_rx_count
++;
454 if (unlikely(tx
->local
->key_tx_rx_threshold
&&
455 tx
->key
->tx_rx_count
>
456 tx
->local
->key_tx_rx_threshold
)) {
457 ieee80211_key_threshold_notify(tx
->dev
, tx
->key
,
462 return TXRX_CONTINUE
;
465 static ieee80211_txrx_result
466 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
468 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
469 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
470 struct sk_buff
**frags
, *first
, *frag
;
474 int frag_threshold
= tx
->local
->fragmentation_threshold
;
476 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
477 return TXRX_CONTINUE
;
481 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
482 payload_len
= first
->len
- hdrlen
;
483 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
484 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
486 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
490 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
491 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
492 pos
= first
->data
+ hdrlen
+ per_fragm
;
493 left
= payload_len
- per_fragm
;
494 for (i
= 0; i
< num_fragm
- 1; i
++) {
495 struct ieee80211_hdr
*fhdr
;
501 /* reserve enough extra head and tail room for possible
504 dev_alloc_skb(tx
->local
->tx_headroom
+
506 IEEE80211_ENCRYPT_HEADROOM
+
507 IEEE80211_ENCRYPT_TAILROOM
);
510 /* Make sure that all fragments use the same priority so
511 * that they end up using the same TX queue */
512 frag
->priority
= first
->priority
;
513 skb_reserve(frag
, tx
->local
->tx_headroom
+
514 IEEE80211_ENCRYPT_HEADROOM
);
515 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
516 memcpy(fhdr
, first
->data
, hdrlen
);
517 if (i
== num_fragm
- 2)
518 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
519 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
520 copylen
= left
> per_fragm
? per_fragm
: left
;
521 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
526 skb_trim(first
, hdrlen
+ per_fragm
);
528 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
529 tx
->u
.tx
.extra_frag
= frags
;
531 return TXRX_CONTINUE
;
534 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
536 for (i
= 0; i
< num_fragm
- 1; i
++)
538 dev_kfree_skb(frags
[i
]);
541 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
545 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
547 if (!(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)) {
548 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
551 tx
->u
.tx
.control
->key_idx
= tx
->key
->conf
.hw_key_idx
;
552 if (tx
->key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) {
553 if (!ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
))
560 static ieee80211_txrx_result
561 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
563 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
566 fc
= le16_to_cpu(hdr
->frame_control
);
568 if (!tx
->key
|| tx
->key
->conf
.alg
!= ALG_WEP
||
569 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
570 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
571 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
572 return TXRX_CONTINUE
;
574 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
575 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
576 ieee80211_tx_set_iswep(tx
);
578 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
579 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
583 if (tx
->u
.tx
.extra_frag
) {
585 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
586 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
587 I802_DEBUG_INC(tx
->local
->
588 tx_handlers_drop_wep
);
594 return TXRX_CONTINUE
;
597 static ieee80211_txrx_result
598 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
600 struct rate_control_extra extra
;
602 memset(&extra
, 0, sizeof(extra
));
603 extra
.mode
= tx
->u
.tx
.mode
;
604 extra
.mgmt_data
= tx
->sdata
&&
605 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
606 extra
.ethertype
= tx
->ethertype
;
608 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
610 if (unlikely(extra
.probe
!= NULL
)) {
611 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
612 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
613 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
614 tx
->u
.tx
.rate
= extra
.probe
;
616 tx
->u
.tx
.control
->alt_retry_rate
= -1;
620 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
621 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
622 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
623 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
625 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
627 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
628 tx
->u
.tx
.rate
= extra
.nonerp
;
629 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
630 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
632 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
633 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
635 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
637 return TXRX_CONTINUE
;
640 static ieee80211_txrx_result
641 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
643 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
644 u16 fc
= le16_to_cpu(hdr
->frame_control
);
646 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
647 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
649 if (!is_multicast_ether_addr(hdr
->addr1
)) {
650 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
651 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
652 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
653 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
654 control
->retry_limit
=
655 tx
->local
->long_retry_limit
;
657 control
->retry_limit
=
658 tx
->local
->short_retry_limit
;
661 control
->retry_limit
= 1;
664 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
665 /* Do not use multiple retry rates when sending fragmented
667 * TODO: The last fragment could still use multiple retry
669 control
->alt_retry_rate
= -1;
672 /* Use CTS protection for unicast frames sent using extended rates if
673 * there are associated non-ERP stations and RTS/CTS is not configured
675 if (mode
->mode
== MODE_IEEE80211G
&&
676 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
677 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
678 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
679 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
680 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
682 /* Transmit data frames using short preambles if the driver supports
683 * short preambles at the selected rate and short preambles are
684 * available on the network at the current point in time. */
685 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
686 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
687 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
688 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
689 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
692 /* Setup duration field for the first fragment of the frame. Duration
693 * for remaining fragments will be updated when they are being sent
694 * to low-level driver in ieee80211_tx(). */
695 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
696 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
697 tx
->u
.tx
.extra_frag
[0]->len
: 0);
698 hdr
->duration_id
= cpu_to_le16(dur
);
700 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
701 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
702 struct ieee80211_rate
*rate
;
704 /* Do not use multiple retry rates when using RTS/CTS */
705 control
->alt_retry_rate
= -1;
707 /* Use min(data rate, max base rate) as CTS/RTS rate */
708 rate
= tx
->u
.tx
.rate
;
709 while (rate
> mode
->rates
&&
710 !(rate
->flags
& IEEE80211_RATE_BASIC
))
713 control
->rts_cts_rate
= rate
->val
;
714 control
->rts_rate
= rate
;
718 tx
->sta
->tx_packets
++;
719 tx
->sta
->tx_fragments
++;
720 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
721 if (tx
->u
.tx
.extra_frag
) {
723 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
724 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
726 tx
->u
.tx
.extra_frag
[i
]->len
;
732 * Tell hardware to not encrypt when we had sw crypto.
733 * Because we use the same flag to internally indicate that
734 * no (software) encryption should be done, we have to set it
735 * after all crypto handlers.
737 if (tx
->key
&& !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
738 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
740 return TXRX_CONTINUE
;
743 static ieee80211_txrx_result
744 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
746 struct ieee80211_local
*local
= tx
->local
;
747 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
748 struct sk_buff
*skb
= tx
->skb
;
749 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
750 u32 load
= 0, hdrtime
;
752 /* TODO: this could be part of tx_status handling, so that the number
753 * of retries would be known; TX rate should in that case be stored
754 * somewhere with the packet */
756 /* Estimate total channel use caused by this frame */
758 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
759 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
761 if (mode
->mode
== MODE_IEEE80211A
||
762 (mode
->mode
== MODE_IEEE80211G
&&
763 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
764 hdrtime
= CHAN_UTIL_HDR_SHORT
;
766 hdrtime
= CHAN_UTIL_HDR_LONG
;
769 if (!is_multicast_ether_addr(hdr
->addr1
))
772 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
774 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
777 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
779 if (tx
->u
.tx
.extra_frag
) {
781 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
783 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
788 /* Divide channel_use by 8 to avoid wrapping around the counter */
789 load
>>= CHAN_UTIL_SHIFT
;
790 local
->channel_use_raw
+= load
;
792 tx
->sta
->channel_use_raw
+= load
;
793 tx
->sdata
->channel_use_raw
+= load
;
795 return TXRX_CONTINUE
;
798 /* TODO: implement register/unregister functions for adding TX/RX handlers
799 * into ordered list */
801 ieee80211_tx_handler ieee80211_tx_handlers
[] =
803 ieee80211_tx_h_check_assoc
,
804 ieee80211_tx_h_sequence
,
805 ieee80211_tx_h_ps_buf
,
806 ieee80211_tx_h_select_key
,
807 ieee80211_tx_h_michael_mic_add
,
808 ieee80211_tx_h_fragment
,
809 ieee80211_tx_h_tkip_encrypt
,
810 ieee80211_tx_h_ccmp_encrypt
,
811 ieee80211_tx_h_wep_encrypt
,
812 ieee80211_tx_h_rate_ctrl
,
814 ieee80211_tx_h_load_stats
,
818 /* actual transmit path */
821 * deal with packet injection down monitor interface
822 * with Radiotap Header -- only called for monitor mode interface
824 static ieee80211_txrx_result
825 __ieee80211_parse_tx_radiotap(
826 struct ieee80211_txrx_data
*tx
,
827 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
830 * this is the moment to interpret and discard the radiotap header that
831 * must be at the start of the packet injected in Monitor mode
833 * Need to take some care with endian-ness since radiotap
834 * args are little-endian
837 struct ieee80211_radiotap_iterator iterator
;
838 struct ieee80211_radiotap_header
*rthdr
=
839 (struct ieee80211_radiotap_header
*) skb
->data
;
840 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
841 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
844 * default control situation for all injected packets
845 * FIXME: this does not suit all usage cases, expand to allow control
848 control
->retry_limit
= 1; /* no retry */
849 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
850 IEEE80211_TXCTL_USE_CTS_PROTECT
);
851 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
852 IEEE80211_TXCTL_NO_ACK
;
853 control
->antenna_sel_tx
= 0; /* default to default antenna */
856 * for every radiotap entry that is present
857 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
858 * entries present, or -EINVAL on error)
864 ret
= ieee80211_radiotap_iterator_next(&iterator
);
869 /* see if this argument is something we can use */
870 switch (iterator
.this_arg_index
) {
872 * You must take care when dereferencing iterator.this_arg
873 * for multibyte types... the pointer is not aligned. Use
874 * get_unaligned((type *)iterator.this_arg) to dereference
875 * iterator.this_arg for type "type" safely on all arches.
877 case IEEE80211_RADIOTAP_RATE
:
879 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
880 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
882 target_rate
= (*iterator
.this_arg
) * 5;
883 for (i
= 0; i
< mode
->num_rates
; i
++) {
884 struct ieee80211_rate
*r
= &mode
->rates
[i
];
886 if (r
->rate
> target_rate
)
891 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
892 control
->tx_rate
= r
->val2
;
894 control
->tx_rate
= r
->val
;
896 /* end on exact match */
897 if (r
->rate
== target_rate
)
902 case IEEE80211_RADIOTAP_ANTENNA
:
904 * radiotap uses 0 for 1st ant, mac80211 is 1 for
907 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
910 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
911 control
->power_level
= *iterator
.this_arg
;
914 case IEEE80211_RADIOTAP_FLAGS
:
915 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
917 * this indicates that the skb we have been
918 * handed has the 32-bit FCS CRC at the end...
919 * we should react to that by snipping it off
920 * because it will be recomputed and added
923 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
926 skb_trim(skb
, skb
->len
- FCS_LEN
);
935 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
939 * remove the radiotap header
940 * iterator->max_length was sanity-checked against
941 * skb->len by iterator init
943 skb_pull(skb
, iterator
.max_length
);
945 return TXRX_CONTINUE
;
948 static ieee80211_txrx_result
inline
949 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
951 struct net_device
*dev
,
952 struct ieee80211_tx_control
*control
)
954 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
955 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
956 struct ieee80211_sub_if_data
*sdata
;
957 ieee80211_txrx_result res
= TXRX_CONTINUE
;
961 memset(tx
, 0, sizeof(*tx
));
963 tx
->dev
= dev
; /* use original interface */
965 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
968 * set defaults for things that can be set by
969 * injected radiotap headers
971 control
->power_level
= local
->hw
.conf
.power_level
;
972 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
974 /* process and remove the injection radiotap header */
975 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
976 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
977 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
982 * we removed the radiotap header after this point,
983 * we filled control with what we could use
984 * set to the actual ieee header now
986 hdr
= (struct ieee80211_hdr
*) skb
->data
;
987 res
= TXRX_QUEUED
; /* indication it was monitor packet */
990 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
991 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
992 tx
->u
.tx
.control
= control
;
993 if (is_multicast_ether_addr(hdr
->addr1
)) {
994 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
995 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
997 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
998 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
1000 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
1001 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
1002 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1003 !local
->ops
->set_frag_threshold
)
1004 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
1006 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
1008 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1009 else if (tx
->sta
->clear_dst_mask
) {
1010 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1011 tx
->sta
->clear_dst_mask
= 0;
1013 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1014 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1015 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1016 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1018 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1023 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1024 * finished with it. */
1025 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1026 struct sk_buff
*skb
,
1027 struct net_device
*mdev
,
1028 struct ieee80211_tx_control
*control
)
1030 struct ieee80211_tx_packet_data
*pkt_data
;
1031 struct net_device
*dev
;
1033 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1034 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1035 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1041 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1045 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1046 struct ieee80211_txrx_data
*tx
)
1048 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1051 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1052 __ieee80211_queue_stopped(local
, 0)) {
1053 netif_stop_queue(local
->mdev
);
1054 return IEEE80211_TX_AGAIN
;
1057 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1058 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1060 return IEEE80211_TX_AGAIN
;
1061 local
->mdev
->trans_start
= jiffies
;
1062 ieee80211_led_tx(local
, 1);
1064 if (tx
->u
.tx
.extra_frag
) {
1065 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1066 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1067 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1068 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1069 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1070 if (!tx
->u
.tx
.extra_frag
[i
])
1072 if (__ieee80211_queue_stopped(local
, control
->queue
))
1073 return IEEE80211_TX_FRAG_AGAIN
;
1074 if (i
== tx
->u
.tx
.num_extra_frag
) {
1075 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1076 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1077 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1079 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1082 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1085 ieee80211_dump_frame(local
->mdev
->name
,
1086 "TX to low-level driver",
1087 tx
->u
.tx
.extra_frag
[i
]);
1088 ret
= local
->ops
->tx(local_to_hw(local
),
1089 tx
->u
.tx
.extra_frag
[i
],
1092 return IEEE80211_TX_FRAG_AGAIN
;
1093 local
->mdev
->trans_start
= jiffies
;
1094 ieee80211_led_tx(local
, 1);
1095 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1097 kfree(tx
->u
.tx
.extra_frag
);
1098 tx
->u
.tx
.extra_frag
= NULL
;
1100 return IEEE80211_TX_OK
;
1103 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1104 struct ieee80211_tx_control
*control
, int mgmt
)
1106 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1107 struct sta_info
*sta
;
1108 ieee80211_tx_handler
*handler
;
1109 struct ieee80211_txrx_data tx
;
1110 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1113 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1115 if (unlikely(skb
->len
< 10)) {
1120 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1122 if (res_prepare
== TXRX_DROP
) {
1128 * key references are protected using RCU and this requires that
1129 * we are in a read-site RCU section during receive processing
1134 tx
.u
.tx
.mgmt_interface
= mgmt
;
1135 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1137 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1138 res
= TXRX_CONTINUE
;
1140 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1142 res
= (*handler
)(&tx
);
1143 if (res
!= TXRX_CONTINUE
)
1148 skb
= tx
.skb
; /* handlers are allowed to change skb */
1153 if (unlikely(res
== TXRX_DROP
)) {
1154 I802_DEBUG_INC(local
->tx_handlers_drop
);
1158 if (unlikely(res
== TXRX_QUEUED
)) {
1159 I802_DEBUG_INC(local
->tx_handlers_queued
);
1164 if (tx
.u
.tx
.extra_frag
) {
1165 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1167 struct ieee80211_hdr
*hdr
=
1168 (struct ieee80211_hdr
*)
1169 tx
.u
.tx
.extra_frag
[i
]->data
;
1171 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1172 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1175 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1176 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1178 dur
= ieee80211_duration(&tx
, 0, next_len
);
1179 hdr
->duration_id
= cpu_to_le16(dur
);
1184 ret
= __ieee80211_tx(local
, skb
, &tx
);
1186 struct ieee80211_tx_stored_packet
*store
=
1187 &local
->pending_packet
[control
->queue
];
1189 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1191 set_bit(IEEE80211_LINK_STATE_PENDING
,
1192 &local
->state
[control
->queue
]);
1194 /* When the driver gets out of buffers during sending of
1195 * fragments and calls ieee80211_stop_queue, there is
1196 * a small window between IEEE80211_LINK_STATE_XOFF and
1197 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1198 * gets available in that window (i.e. driver calls
1199 * ieee80211_wake_queue), we would end up with ieee80211_tx
1200 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1201 * continuing transmitting here when that situation is
1202 * possible to have happened. */
1203 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1204 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1205 &local
->state
[control
->queue
]);
1208 memcpy(&store
->control
, control
,
1209 sizeof(struct ieee80211_tx_control
));
1211 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1212 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1213 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1214 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1215 store
->last_frag_rate_ctrl_probe
=
1216 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1224 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1225 if (tx
.u
.tx
.extra_frag
[i
])
1226 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1227 kfree(tx
.u
.tx
.extra_frag
);
1232 /* device xmit handlers */
1234 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1235 struct net_device
*dev
)
1237 struct ieee80211_tx_control control
;
1238 struct ieee80211_tx_packet_data
*pkt_data
;
1239 struct net_device
*odev
= NULL
;
1240 struct ieee80211_sub_if_data
*osdata
;
1245 * copy control out of the skb so other people can use skb->cb
1247 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1248 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1250 if (pkt_data
->ifindex
)
1251 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1252 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1256 if (unlikely(!odev
)) {
1257 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1258 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1259 "originating device\n", dev
->name
);
1264 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1266 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1267 if (skb_headroom(skb
) < headroom
) {
1268 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1275 control
.ifindex
= odev
->ifindex
;
1276 control
.type
= osdata
->type
;
1277 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1278 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1279 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1280 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1281 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1282 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1283 control
.queue
= pkt_data
->queue
;
1285 ret
= ieee80211_tx(odev
, skb
, &control
,
1286 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1292 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1293 struct net_device
*dev
)
1295 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1296 struct ieee80211_tx_packet_data
*pkt_data
;
1297 struct ieee80211_radiotap_header
*prthdr
=
1298 (struct ieee80211_radiotap_header
*)skb
->data
;
1301 /* check for not even having the fixed radiotap header part */
1302 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1303 goto fail
; /* too short to be possibly valid */
1305 /* is it a header version we can trust to find length from? */
1306 if (unlikely(prthdr
->it_version
))
1307 goto fail
; /* only version 0 is supported */
1309 /* then there must be a radiotap header with a length we can use */
1310 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1312 /* does the skb contain enough to deliver on the alleged length? */
1313 if (unlikely(skb
->len
< len_rthdr
))
1314 goto fail
; /* skb too short for claimed rt header extent */
1316 skb
->dev
= local
->mdev
;
1318 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1319 memset(pkt_data
, 0, sizeof(*pkt_data
));
1320 /* needed because we set skb device to master */
1321 pkt_data
->ifindex
= dev
->ifindex
;
1323 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1326 * fix up the pointers accounting for the radiotap
1327 * header still being in there. We are being given
1328 * a precooked IEEE80211 header so no need for
1331 skb_set_mac_header(skb
, len_rthdr
);
1333 * these are just fixed to the end of the rt area since we
1334 * don't have any better information and at this point, nobody cares
1336 skb_set_network_header(skb
, len_rthdr
);
1337 skb_set_transport_header(skb
, len_rthdr
);
1339 /* pass the radiotap header up to the next stage intact */
1340 dev_queue_xmit(skb
);
1341 return NETDEV_TX_OK
;
1345 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1349 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1350 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1351 * @skb: packet to be sent
1352 * @dev: incoming interface
1354 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1355 * not be freed, and caller is responsible for either retrying later or freeing
1358 * This function takes in an Ethernet header and encapsulates it with suitable
1359 * IEEE 802.11 header based on which interface the packet is coming in. The
1360 * encapsulated packet will then be passed to master interface, wlan#.11, for
1361 * transmission (through low-level driver).
1363 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1364 struct net_device
*dev
)
1366 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1367 struct ieee80211_tx_packet_data
*pkt_data
;
1368 struct ieee80211_sub_if_data
*sdata
;
1369 int ret
= 1, head_need
;
1370 u16 ethertype
, hdrlen
, fc
;
1371 struct ieee80211_hdr hdr
;
1372 const u8
*encaps_data
;
1373 int encaps_len
, skip_header_bytes
;
1375 struct sta_info
*sta
;
1377 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1378 if (unlikely(skb
->len
< ETH_HLEN
)) {
1379 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1380 dev
->name
, skb
->len
);
1385 nh_pos
= skb_network_header(skb
) - skb
->data
;
1386 h_pos
= skb_transport_header(skb
) - skb
->data
;
1388 /* convert Ethernet header to proper 802.11 header (based on
1389 * operation mode) */
1390 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1391 /* TODO: handling for 802.1x authorized/unauthorized port */
1392 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1394 switch (sdata
->type
) {
1395 case IEEE80211_IF_TYPE_AP
:
1396 case IEEE80211_IF_TYPE_VLAN
:
1397 fc
|= IEEE80211_FCTL_FROMDS
;
1399 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1400 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1401 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1404 case IEEE80211_IF_TYPE_WDS
:
1405 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1407 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1408 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1409 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1410 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1413 case IEEE80211_IF_TYPE_STA
:
1414 fc
|= IEEE80211_FCTL_TODS
;
1416 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1417 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1418 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1421 case IEEE80211_IF_TYPE_IBSS
:
1423 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1424 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1425 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1433 /* receiver is QoS enabled, use a QoS type frame */
1434 sta
= sta_info_get(local
, hdr
.addr1
);
1436 if (sta
->flags
& WLAN_STA_WME
) {
1437 fc
|= IEEE80211_STYPE_QOS_DATA
;
1443 hdr
.frame_control
= cpu_to_le16(fc
);
1444 hdr
.duration_id
= 0;
1447 skip_header_bytes
= ETH_HLEN
;
1448 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1449 encaps_data
= bridge_tunnel_header
;
1450 encaps_len
= sizeof(bridge_tunnel_header
);
1451 skip_header_bytes
-= 2;
1452 } else if (ethertype
>= 0x600) {
1453 encaps_data
= rfc1042_header
;
1454 encaps_len
= sizeof(rfc1042_header
);
1455 skip_header_bytes
-= 2;
1461 skb_pull(skb
, skip_header_bytes
);
1462 nh_pos
-= skip_header_bytes
;
1463 h_pos
-= skip_header_bytes
;
1465 /* TODO: implement support for fragments so that there is no need to
1466 * reallocate and copy payload; it might be enough to support one
1467 * extra fragment that would be copied in the beginning of the frame
1468 * data.. anyway, it would be nice to include this into skb structure
1471 * There are few options for this:
1472 * use skb->cb as an extra space for 802.11 header
1473 * allocate new buffer if not enough headroom
1474 * make sure that there is enough headroom in every skb by increasing
1475 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1476 * alloc_skb() (net/core/skbuff.c)
1478 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1479 head_need
-= skb_headroom(skb
);
1481 /* We are going to modify skb data, so make a copy of it if happens to
1482 * be cloned. This could happen, e.g., with Linux bridge code passing
1483 * us broadcast frames. */
1485 if (head_need
> 0 || skb_cloned(skb
)) {
1487 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1488 "of headroom\n", dev
->name
, head_need
);
1491 if (skb_cloned(skb
))
1492 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1494 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1495 /* Since we have to reallocate the buffer, make sure that there
1496 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1497 * before payload and 12 after). */
1498 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1500 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1507 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1508 nh_pos
+= encaps_len
;
1509 h_pos
+= encaps_len
;
1512 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1513 __le16
*qos_control
;
1515 qos_control
= (__le16
*) skb_push(skb
, 2);
1516 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1518 * Maybe we could actually set some fields here, for now just
1519 * initialise to zero to indicate no special operation.
1523 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1528 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1529 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1530 pkt_data
->ifindex
= dev
->ifindex
;
1531 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1532 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1534 skb
->dev
= local
->mdev
;
1535 dev
->stats
.tx_packets
++;
1536 dev
->stats
.tx_bytes
+= skb
->len
;
1538 /* Update skb pointers to various headers since this modified frame
1539 * is going to go through Linux networking code that may potentially
1540 * need things like pointer to IP header. */
1541 skb_set_mac_header(skb
, 0);
1542 skb_set_network_header(skb
, nh_pos
);
1543 skb_set_transport_header(skb
, h_pos
);
1545 dev
->trans_start
= jiffies
;
1546 dev_queue_xmit(skb
);
1558 * This is the transmit routine for the 802.11 type interfaces
1559 * called by upper layers of the linux networking
1560 * stack when it has a frame to transmit
1562 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1564 struct ieee80211_sub_if_data
*sdata
;
1565 struct ieee80211_tx_packet_data
*pkt_data
;
1566 struct ieee80211_hdr
*hdr
;
1569 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1571 if (skb
->len
< 10) {
1576 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1577 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1584 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1585 fc
= le16_to_cpu(hdr
->frame_control
);
1587 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1588 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1589 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1590 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1591 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1593 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1594 skb
->dev
= sdata
->local
->mdev
;
1597 * We're using the protocol field of the the frame control header
1598 * to request TX callback for hostapd. BIT(1) is checked.
1600 if ((fc
& BIT(1)) == BIT(1)) {
1601 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1603 hdr
->frame_control
= cpu_to_le16(fc
);
1606 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1607 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1609 dev
->stats
.tx_packets
++;
1610 dev
->stats
.tx_bytes
+= skb
->len
;
1612 dev_queue_xmit(skb
);
1617 /* helper functions for pending packets for when queues are stopped */
1619 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1622 struct ieee80211_tx_stored_packet
*store
;
1624 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1625 if (!__ieee80211_queue_pending(local
, i
))
1627 store
= &local
->pending_packet
[i
];
1628 kfree_skb(store
->skb
);
1629 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1630 kfree_skb(store
->extra_frag
[j
]);
1631 kfree(store
->extra_frag
);
1632 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1636 void ieee80211_tx_pending(unsigned long data
)
1638 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1639 struct net_device
*dev
= local
->mdev
;
1640 struct ieee80211_tx_stored_packet
*store
;
1641 struct ieee80211_txrx_data tx
;
1642 int i
, ret
, reschedule
= 0;
1644 netif_tx_lock_bh(dev
);
1645 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1646 if (__ieee80211_queue_stopped(local
, i
))
1648 if (!__ieee80211_queue_pending(local
, i
)) {
1652 store
= &local
->pending_packet
[i
];
1653 tx
.u
.tx
.control
= &store
->control
;
1654 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1655 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1656 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1657 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1659 if (store
->last_frag_rate_ctrl_probe
)
1660 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1661 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1663 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1666 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1671 netif_tx_unlock_bh(dev
);
1673 if (!ieee80211_qdisc_installed(dev
)) {
1674 if (!__ieee80211_queue_stopped(local
, 0))
1675 netif_wake_queue(dev
);
1677 netif_schedule(dev
);
1681 /* functions for drivers to get certain frames */
1683 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1684 struct ieee80211_if_ap
*bss
,
1685 struct sk_buff
*skb
)
1689 int i
, have_bits
= 0, n1
, n2
;
1691 /* Generate bitmap for TIM only if there are any STAs in power save
1693 read_lock_bh(&local
->sta_lock
);
1694 if (atomic_read(&bss
->num_sta_ps
) > 0)
1695 /* in the hope that this is faster than
1696 * checking byte-for-byte */
1697 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1698 IEEE80211_MAX_AID
+1);
1700 if (bss
->dtim_count
== 0)
1701 bss
->dtim_count
= bss
->dtim_period
- 1;
1705 tim
= pos
= (u8
*) skb_put(skb
, 6);
1706 *pos
++ = WLAN_EID_TIM
;
1708 *pos
++ = bss
->dtim_count
;
1709 *pos
++ = bss
->dtim_period
;
1711 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1715 /* Find largest even number N1 so that bits numbered 1 through
1716 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1717 * (N2 + 1) x 8 through 2007 are 0. */
1719 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1726 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1733 /* Bitmap control */
1735 /* Part Virt Bitmap */
1736 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1738 tim
[1] = n2
- n1
+ 4;
1739 skb_put(skb
, n2
- n1
);
1741 *pos
++ = aid0
; /* Bitmap control */
1742 *pos
++ = 0; /* Part Virt Bitmap */
1744 read_unlock_bh(&local
->sta_lock
);
1747 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1748 struct ieee80211_tx_control
*control
)
1750 struct ieee80211_local
*local
= hw_to_local(hw
);
1751 struct sk_buff
*skb
;
1752 struct net_device
*bdev
;
1753 struct ieee80211_sub_if_data
*sdata
= NULL
;
1754 struct ieee80211_if_ap
*ap
= NULL
;
1755 struct ieee80211_rate
*rate
;
1756 struct rate_control_extra extra
;
1757 u8
*b_head
, *b_tail
;
1760 bdev
= dev_get_by_index(&init_net
, if_id
);
1762 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1767 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1769 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1770 if (net_ratelimit())
1771 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1772 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1773 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1777 /* Assume we are generating the normal beacon locally */
1778 b_head
= ap
->beacon_head
;
1779 b_tail
= ap
->beacon_tail
;
1780 bh_len
= ap
->beacon_head_len
;
1781 bt_len
= ap
->beacon_tail_len
;
1783 skb
= dev_alloc_skb(local
->tx_headroom
+
1784 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1788 skb_reserve(skb
, local
->tx_headroom
);
1789 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1791 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1793 ieee80211_beacon_add_tim(local
, ap
, skb
);
1796 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1800 memset(&extra
, 0, sizeof(extra
));
1801 extra
.mode
= local
->oper_hw_mode
;
1803 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1805 if (net_ratelimit()) {
1806 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1807 "found\n", local
->mdev
->name
);
1814 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1815 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1816 rate
->val2
: rate
->val
;
1817 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1818 control
->power_level
= local
->hw
.conf
.power_level
;
1819 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1820 control
->retry_limit
= 1;
1821 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1827 EXPORT_SYMBOL(ieee80211_beacon_get
);
1829 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1830 const void *frame
, size_t frame_len
,
1831 const struct ieee80211_tx_control
*frame_txctl
,
1832 struct ieee80211_rts
*rts
)
1834 const struct ieee80211_hdr
*hdr
= frame
;
1837 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1838 rts
->frame_control
= cpu_to_le16(fctl
);
1839 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1840 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1841 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1843 EXPORT_SYMBOL(ieee80211_rts_get
);
1845 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1846 const void *frame
, size_t frame_len
,
1847 const struct ieee80211_tx_control
*frame_txctl
,
1848 struct ieee80211_cts
*cts
)
1850 const struct ieee80211_hdr
*hdr
= frame
;
1853 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1854 cts
->frame_control
= cpu_to_le16(fctl
);
1855 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1856 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1858 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1861 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1862 struct ieee80211_tx_control
*control
)
1864 struct ieee80211_local
*local
= hw_to_local(hw
);
1865 struct sk_buff
*skb
;
1866 struct sta_info
*sta
;
1867 ieee80211_tx_handler
*handler
;
1868 struct ieee80211_txrx_data tx
;
1869 ieee80211_txrx_result res
= TXRX_DROP
;
1870 struct net_device
*bdev
;
1871 struct ieee80211_sub_if_data
*sdata
;
1872 struct ieee80211_if_ap
*bss
= NULL
;
1874 bdev
= dev_get_by_index(&init_net
, if_id
);
1876 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1880 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1883 if (bss
->dtim_count
!= 0)
1884 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1885 memset(control
, 0, sizeof(*control
));
1887 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1890 local
->total_ps_buffered
--;
1892 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1893 struct ieee80211_hdr
*hdr
=
1894 (struct ieee80211_hdr
*) skb
->data
;
1895 /* more buffered multicast/broadcast frames ==> set
1896 * MoreData flag in IEEE 802.11 header to inform PS
1898 hdr
->frame_control
|=
1899 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1902 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1904 dev_kfree_skb_any(skb
);
1907 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1908 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1910 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1911 res
= (*handler
)(&tx
);
1912 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1916 skb
= tx
.skb
; /* handlers are allowed to change skb */
1918 if (res
== TXRX_DROP
) {
1919 I802_DEBUG_INC(local
->tx_handlers_drop
);
1922 } else if (res
== TXRX_QUEUED
) {
1923 I802_DEBUG_INC(local
->tx_handlers_queued
);
1932 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);