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 /* TODO: add threshold stuff again */
457 return TXRX_CONTINUE
;
460 static ieee80211_txrx_result
461 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
463 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
464 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
465 struct sk_buff
**frags
, *first
, *frag
;
469 int frag_threshold
= tx
->local
->fragmentation_threshold
;
471 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
472 return TXRX_CONTINUE
;
476 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
477 payload_len
= first
->len
- hdrlen
;
478 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
479 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
481 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
485 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
486 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
487 pos
= first
->data
+ hdrlen
+ per_fragm
;
488 left
= payload_len
- per_fragm
;
489 for (i
= 0; i
< num_fragm
- 1; i
++) {
490 struct ieee80211_hdr
*fhdr
;
496 /* reserve enough extra head and tail room for possible
499 dev_alloc_skb(tx
->local
->tx_headroom
+
501 IEEE80211_ENCRYPT_HEADROOM
+
502 IEEE80211_ENCRYPT_TAILROOM
);
505 /* Make sure that all fragments use the same priority so
506 * that they end up using the same TX queue */
507 frag
->priority
= first
->priority
;
508 skb_reserve(frag
, tx
->local
->tx_headroom
+
509 IEEE80211_ENCRYPT_HEADROOM
);
510 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
511 memcpy(fhdr
, first
->data
, hdrlen
);
512 if (i
== num_fragm
- 2)
513 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
514 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
515 copylen
= left
> per_fragm
? per_fragm
: left
;
516 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
521 skb_trim(first
, hdrlen
+ per_fragm
);
523 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
524 tx
->u
.tx
.extra_frag
= frags
;
526 return TXRX_CONTINUE
;
529 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
531 for (i
= 0; i
< num_fragm
- 1; i
++)
533 dev_kfree_skb(frags
[i
]);
536 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
540 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
542 if (!(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)) {
543 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
546 tx
->u
.tx
.control
->key_idx
= tx
->key
->conf
.hw_key_idx
;
547 if (tx
->key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) {
548 if (!ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
))
555 static ieee80211_txrx_result
556 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
558 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
561 fc
= le16_to_cpu(hdr
->frame_control
);
563 if (!tx
->key
|| tx
->key
->conf
.alg
!= ALG_WEP
||
564 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
565 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
566 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
567 return TXRX_CONTINUE
;
569 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
570 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
571 ieee80211_tx_set_iswep(tx
);
573 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
574 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
578 if (tx
->u
.tx
.extra_frag
) {
580 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
581 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
582 I802_DEBUG_INC(tx
->local
->
583 tx_handlers_drop_wep
);
589 return TXRX_CONTINUE
;
592 static ieee80211_txrx_result
593 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
595 struct rate_control_extra extra
;
597 memset(&extra
, 0, sizeof(extra
));
598 extra
.mode
= tx
->u
.tx
.mode
;
599 extra
.mgmt_data
= tx
->sdata
&&
600 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
601 extra
.ethertype
= tx
->ethertype
;
603 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
605 if (unlikely(extra
.probe
!= NULL
)) {
606 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
607 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
608 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
609 tx
->u
.tx
.rate
= extra
.probe
;
611 tx
->u
.tx
.control
->alt_retry_rate
= -1;
615 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
616 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
617 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
618 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
620 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
622 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
623 tx
->u
.tx
.rate
= extra
.nonerp
;
624 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
625 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
627 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
628 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
630 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
632 return TXRX_CONTINUE
;
635 static ieee80211_txrx_result
636 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
638 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
639 u16 fc
= le16_to_cpu(hdr
->frame_control
);
641 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
642 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
644 if (!is_multicast_ether_addr(hdr
->addr1
)) {
645 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
646 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
647 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
648 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
649 control
->retry_limit
=
650 tx
->local
->long_retry_limit
;
652 control
->retry_limit
=
653 tx
->local
->short_retry_limit
;
656 control
->retry_limit
= 1;
659 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
660 /* Do not use multiple retry rates when sending fragmented
662 * TODO: The last fragment could still use multiple retry
664 control
->alt_retry_rate
= -1;
667 /* Use CTS protection for unicast frames sent using extended rates if
668 * there are associated non-ERP stations and RTS/CTS is not configured
670 if (mode
->mode
== MODE_IEEE80211G
&&
671 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
672 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
673 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
674 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
675 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
677 /* Transmit data frames using short preambles if the driver supports
678 * short preambles at the selected rate and short preambles are
679 * available on the network at the current point in time. */
680 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
681 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
682 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
683 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
684 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
687 /* Setup duration field for the first fragment of the frame. Duration
688 * for remaining fragments will be updated when they are being sent
689 * to low-level driver in ieee80211_tx(). */
690 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
691 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
692 tx
->u
.tx
.extra_frag
[0]->len
: 0);
693 hdr
->duration_id
= cpu_to_le16(dur
);
695 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
696 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
697 struct ieee80211_rate
*rate
;
699 /* Do not use multiple retry rates when using RTS/CTS */
700 control
->alt_retry_rate
= -1;
702 /* Use min(data rate, max base rate) as CTS/RTS rate */
703 rate
= tx
->u
.tx
.rate
;
704 while (rate
> mode
->rates
&&
705 !(rate
->flags
& IEEE80211_RATE_BASIC
))
708 control
->rts_cts_rate
= rate
->val
;
709 control
->rts_rate
= rate
;
713 tx
->sta
->tx_packets
++;
714 tx
->sta
->tx_fragments
++;
715 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
716 if (tx
->u
.tx
.extra_frag
) {
718 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
719 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
721 tx
->u
.tx
.extra_frag
[i
]->len
;
727 * Tell hardware to not encrypt when we had sw crypto.
728 * Because we use the same flag to internally indicate that
729 * no (software) encryption should be done, we have to set it
730 * after all crypto handlers.
732 if (tx
->key
&& !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
733 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
735 return TXRX_CONTINUE
;
738 static ieee80211_txrx_result
739 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
741 struct ieee80211_local
*local
= tx
->local
;
742 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
743 struct sk_buff
*skb
= tx
->skb
;
744 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
745 u32 load
= 0, hdrtime
;
747 /* TODO: this could be part of tx_status handling, so that the number
748 * of retries would be known; TX rate should in that case be stored
749 * somewhere with the packet */
751 /* Estimate total channel use caused by this frame */
753 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
754 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
756 if (mode
->mode
== MODE_IEEE80211A
||
757 (mode
->mode
== MODE_IEEE80211G
&&
758 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
759 hdrtime
= CHAN_UTIL_HDR_SHORT
;
761 hdrtime
= CHAN_UTIL_HDR_LONG
;
764 if (!is_multicast_ether_addr(hdr
->addr1
))
767 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
769 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
772 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
774 if (tx
->u
.tx
.extra_frag
) {
776 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
778 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
783 /* Divide channel_use by 8 to avoid wrapping around the counter */
784 load
>>= CHAN_UTIL_SHIFT
;
785 local
->channel_use_raw
+= load
;
787 tx
->sta
->channel_use_raw
+= load
;
788 tx
->sdata
->channel_use_raw
+= load
;
790 return TXRX_CONTINUE
;
793 /* TODO: implement register/unregister functions for adding TX/RX handlers
794 * into ordered list */
796 ieee80211_tx_handler ieee80211_tx_handlers
[] =
798 ieee80211_tx_h_check_assoc
,
799 ieee80211_tx_h_sequence
,
800 ieee80211_tx_h_ps_buf
,
801 ieee80211_tx_h_select_key
,
802 ieee80211_tx_h_michael_mic_add
,
803 ieee80211_tx_h_fragment
,
804 ieee80211_tx_h_tkip_encrypt
,
805 ieee80211_tx_h_ccmp_encrypt
,
806 ieee80211_tx_h_wep_encrypt
,
807 ieee80211_tx_h_rate_ctrl
,
809 ieee80211_tx_h_load_stats
,
813 /* actual transmit path */
816 * deal with packet injection down monitor interface
817 * with Radiotap Header -- only called for monitor mode interface
819 static ieee80211_txrx_result
820 __ieee80211_parse_tx_radiotap(
821 struct ieee80211_txrx_data
*tx
,
822 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
825 * this is the moment to interpret and discard the radiotap header that
826 * must be at the start of the packet injected in Monitor mode
828 * Need to take some care with endian-ness since radiotap
829 * args are little-endian
832 struct ieee80211_radiotap_iterator iterator
;
833 struct ieee80211_radiotap_header
*rthdr
=
834 (struct ieee80211_radiotap_header
*) skb
->data
;
835 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
836 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
839 * default control situation for all injected packets
840 * FIXME: this does not suit all usage cases, expand to allow control
843 control
->retry_limit
= 1; /* no retry */
844 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
845 IEEE80211_TXCTL_USE_CTS_PROTECT
);
846 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
847 IEEE80211_TXCTL_NO_ACK
;
848 control
->antenna_sel_tx
= 0; /* default to default antenna */
851 * for every radiotap entry that is present
852 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
853 * entries present, or -EINVAL on error)
859 ret
= ieee80211_radiotap_iterator_next(&iterator
);
864 /* see if this argument is something we can use */
865 switch (iterator
.this_arg_index
) {
867 * You must take care when dereferencing iterator.this_arg
868 * for multibyte types... the pointer is not aligned. Use
869 * get_unaligned((type *)iterator.this_arg) to dereference
870 * iterator.this_arg for type "type" safely on all arches.
872 case IEEE80211_RADIOTAP_RATE
:
874 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
875 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
877 target_rate
= (*iterator
.this_arg
) * 5;
878 for (i
= 0; i
< mode
->num_rates
; i
++) {
879 struct ieee80211_rate
*r
= &mode
->rates
[i
];
881 if (r
->rate
> target_rate
)
886 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
887 control
->tx_rate
= r
->val2
;
889 control
->tx_rate
= r
->val
;
891 /* end on exact match */
892 if (r
->rate
== target_rate
)
897 case IEEE80211_RADIOTAP_ANTENNA
:
899 * radiotap uses 0 for 1st ant, mac80211 is 1 for
902 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
905 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
906 control
->power_level
= *iterator
.this_arg
;
909 case IEEE80211_RADIOTAP_FLAGS
:
910 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
912 * this indicates that the skb we have been
913 * handed has the 32-bit FCS CRC at the end...
914 * we should react to that by snipping it off
915 * because it will be recomputed and added
918 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
921 skb_trim(skb
, skb
->len
- FCS_LEN
);
930 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
934 * remove the radiotap header
935 * iterator->max_length was sanity-checked against
936 * skb->len by iterator init
938 skb_pull(skb
, iterator
.max_length
);
940 return TXRX_CONTINUE
;
943 static ieee80211_txrx_result
inline
944 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
946 struct net_device
*dev
,
947 struct ieee80211_tx_control
*control
)
949 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
950 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
951 struct ieee80211_sub_if_data
*sdata
;
952 ieee80211_txrx_result res
= TXRX_CONTINUE
;
956 memset(tx
, 0, sizeof(*tx
));
958 tx
->dev
= dev
; /* use original interface */
960 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
963 * set defaults for things that can be set by
964 * injected radiotap headers
966 control
->power_level
= local
->hw
.conf
.power_level
;
967 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
969 /* process and remove the injection radiotap header */
970 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
971 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
972 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
977 * we removed the radiotap header after this point,
978 * we filled control with what we could use
979 * set to the actual ieee header now
981 hdr
= (struct ieee80211_hdr
*) skb
->data
;
982 res
= TXRX_QUEUED
; /* indication it was monitor packet */
985 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
986 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
987 tx
->u
.tx
.control
= control
;
988 if (is_multicast_ether_addr(hdr
->addr1
)) {
989 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
990 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
992 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
993 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
995 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
996 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
997 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
998 !local
->ops
->set_frag_threshold
)
999 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
1001 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
1003 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1004 else if (tx
->sta
->clear_dst_mask
) {
1005 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1006 tx
->sta
->clear_dst_mask
= 0;
1008 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1009 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1010 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1011 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1013 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1018 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1019 * finished with it. */
1020 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1021 struct sk_buff
*skb
,
1022 struct net_device
*mdev
,
1023 struct ieee80211_tx_control
*control
)
1025 struct ieee80211_tx_packet_data
*pkt_data
;
1026 struct net_device
*dev
;
1028 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1029 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1030 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1036 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1040 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1041 struct ieee80211_txrx_data
*tx
)
1043 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1046 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1047 __ieee80211_queue_stopped(local
, 0)) {
1048 netif_stop_queue(local
->mdev
);
1049 return IEEE80211_TX_AGAIN
;
1052 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1053 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1055 return IEEE80211_TX_AGAIN
;
1056 local
->mdev
->trans_start
= jiffies
;
1057 ieee80211_led_tx(local
, 1);
1059 if (tx
->u
.tx
.extra_frag
) {
1060 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1061 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1062 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1063 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1064 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1065 if (!tx
->u
.tx
.extra_frag
[i
])
1067 if (__ieee80211_queue_stopped(local
, control
->queue
))
1068 return IEEE80211_TX_FRAG_AGAIN
;
1069 if (i
== tx
->u
.tx
.num_extra_frag
) {
1070 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1071 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1072 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1074 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1077 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1080 ieee80211_dump_frame(local
->mdev
->name
,
1081 "TX to low-level driver",
1082 tx
->u
.tx
.extra_frag
[i
]);
1083 ret
= local
->ops
->tx(local_to_hw(local
),
1084 tx
->u
.tx
.extra_frag
[i
],
1087 return IEEE80211_TX_FRAG_AGAIN
;
1088 local
->mdev
->trans_start
= jiffies
;
1089 ieee80211_led_tx(local
, 1);
1090 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1092 kfree(tx
->u
.tx
.extra_frag
);
1093 tx
->u
.tx
.extra_frag
= NULL
;
1095 return IEEE80211_TX_OK
;
1098 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1099 struct ieee80211_tx_control
*control
, int mgmt
)
1101 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1102 struct sta_info
*sta
;
1103 ieee80211_tx_handler
*handler
;
1104 struct ieee80211_txrx_data tx
;
1105 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1108 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1110 if (unlikely(skb
->len
< 10)) {
1115 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1117 if (res_prepare
== TXRX_DROP
) {
1123 * key references are protected using RCU and this requires that
1124 * we are in a read-site RCU section during receive processing
1129 tx
.u
.tx
.mgmt_interface
= mgmt
;
1130 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1132 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1133 res
= TXRX_CONTINUE
;
1135 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1137 res
= (*handler
)(&tx
);
1138 if (res
!= TXRX_CONTINUE
)
1143 skb
= tx
.skb
; /* handlers are allowed to change skb */
1148 if (unlikely(res
== TXRX_DROP
)) {
1149 I802_DEBUG_INC(local
->tx_handlers_drop
);
1153 if (unlikely(res
== TXRX_QUEUED
)) {
1154 I802_DEBUG_INC(local
->tx_handlers_queued
);
1159 if (tx
.u
.tx
.extra_frag
) {
1160 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1162 struct ieee80211_hdr
*hdr
=
1163 (struct ieee80211_hdr
*)
1164 tx
.u
.tx
.extra_frag
[i
]->data
;
1166 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1167 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1170 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1171 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1173 dur
= ieee80211_duration(&tx
, 0, next_len
);
1174 hdr
->duration_id
= cpu_to_le16(dur
);
1179 ret
= __ieee80211_tx(local
, skb
, &tx
);
1181 struct ieee80211_tx_stored_packet
*store
=
1182 &local
->pending_packet
[control
->queue
];
1184 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1186 set_bit(IEEE80211_LINK_STATE_PENDING
,
1187 &local
->state
[control
->queue
]);
1189 /* When the driver gets out of buffers during sending of
1190 * fragments and calls ieee80211_stop_queue, there is
1191 * a small window between IEEE80211_LINK_STATE_XOFF and
1192 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1193 * gets available in that window (i.e. driver calls
1194 * ieee80211_wake_queue), we would end up with ieee80211_tx
1195 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1196 * continuing transmitting here when that situation is
1197 * possible to have happened. */
1198 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1199 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1200 &local
->state
[control
->queue
]);
1203 memcpy(&store
->control
, control
,
1204 sizeof(struct ieee80211_tx_control
));
1206 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1207 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1208 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1209 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1210 store
->last_frag_rate_ctrl_probe
=
1211 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1219 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1220 if (tx
.u
.tx
.extra_frag
[i
])
1221 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1222 kfree(tx
.u
.tx
.extra_frag
);
1227 /* device xmit handlers */
1229 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1230 struct net_device
*dev
)
1232 struct ieee80211_tx_control control
;
1233 struct ieee80211_tx_packet_data
*pkt_data
;
1234 struct net_device
*odev
= NULL
;
1235 struct ieee80211_sub_if_data
*osdata
;
1240 * copy control out of the skb so other people can use skb->cb
1242 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1243 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1245 if (pkt_data
->ifindex
)
1246 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1247 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1251 if (unlikely(!odev
)) {
1252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1253 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1254 "originating device\n", dev
->name
);
1259 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1261 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1262 if (skb_headroom(skb
) < headroom
) {
1263 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1270 control
.ifindex
= odev
->ifindex
;
1271 control
.type
= osdata
->type
;
1272 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1273 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1274 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1275 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1276 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1277 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1278 control
.queue
= pkt_data
->queue
;
1280 ret
= ieee80211_tx(odev
, skb
, &control
,
1281 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1287 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1288 struct net_device
*dev
)
1290 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1291 struct ieee80211_tx_packet_data
*pkt_data
;
1292 struct ieee80211_radiotap_header
*prthdr
=
1293 (struct ieee80211_radiotap_header
*)skb
->data
;
1296 /* check for not even having the fixed radiotap header part */
1297 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1298 goto fail
; /* too short to be possibly valid */
1300 /* is it a header version we can trust to find length from? */
1301 if (unlikely(prthdr
->it_version
))
1302 goto fail
; /* only version 0 is supported */
1304 /* then there must be a radiotap header with a length we can use */
1305 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1307 /* does the skb contain enough to deliver on the alleged length? */
1308 if (unlikely(skb
->len
< len_rthdr
))
1309 goto fail
; /* skb too short for claimed rt header extent */
1311 skb
->dev
= local
->mdev
;
1313 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1314 memset(pkt_data
, 0, sizeof(*pkt_data
));
1315 /* needed because we set skb device to master */
1316 pkt_data
->ifindex
= dev
->ifindex
;
1318 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1321 * fix up the pointers accounting for the radiotap
1322 * header still being in there. We are being given
1323 * a precooked IEEE80211 header so no need for
1326 skb_set_mac_header(skb
, len_rthdr
);
1328 * these are just fixed to the end of the rt area since we
1329 * don't have any better information and at this point, nobody cares
1331 skb_set_network_header(skb
, len_rthdr
);
1332 skb_set_transport_header(skb
, len_rthdr
);
1334 /* pass the radiotap header up to the next stage intact */
1335 dev_queue_xmit(skb
);
1336 return NETDEV_TX_OK
;
1340 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1344 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1345 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1346 * @skb: packet to be sent
1347 * @dev: incoming interface
1349 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1350 * not be freed, and caller is responsible for either retrying later or freeing
1353 * This function takes in an Ethernet header and encapsulates it with suitable
1354 * IEEE 802.11 header based on which interface the packet is coming in. The
1355 * encapsulated packet will then be passed to master interface, wlan#.11, for
1356 * transmission (through low-level driver).
1358 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1359 struct net_device
*dev
)
1361 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1362 struct ieee80211_tx_packet_data
*pkt_data
;
1363 struct ieee80211_sub_if_data
*sdata
;
1364 int ret
= 1, head_need
;
1365 u16 ethertype
, hdrlen
, fc
;
1366 struct ieee80211_hdr hdr
;
1367 const u8
*encaps_data
;
1368 int encaps_len
, skip_header_bytes
;
1370 struct sta_info
*sta
;
1372 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1373 if (unlikely(skb
->len
< ETH_HLEN
)) {
1374 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1375 dev
->name
, skb
->len
);
1380 nh_pos
= skb_network_header(skb
) - skb
->data
;
1381 h_pos
= skb_transport_header(skb
) - skb
->data
;
1383 /* convert Ethernet header to proper 802.11 header (based on
1384 * operation mode) */
1385 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1386 /* TODO: handling for 802.1x authorized/unauthorized port */
1387 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1389 switch (sdata
->type
) {
1390 case IEEE80211_IF_TYPE_AP
:
1391 case IEEE80211_IF_TYPE_VLAN
:
1392 fc
|= IEEE80211_FCTL_FROMDS
;
1394 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1395 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1396 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1399 case IEEE80211_IF_TYPE_WDS
:
1400 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1402 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1403 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1404 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1405 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1408 case IEEE80211_IF_TYPE_STA
:
1409 fc
|= IEEE80211_FCTL_TODS
;
1411 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1412 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1413 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1416 case IEEE80211_IF_TYPE_IBSS
:
1418 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1419 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1420 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1428 /* receiver is QoS enabled, use a QoS type frame */
1429 sta
= sta_info_get(local
, hdr
.addr1
);
1431 if (sta
->flags
& WLAN_STA_WME
) {
1432 fc
|= IEEE80211_STYPE_QOS_DATA
;
1438 hdr
.frame_control
= cpu_to_le16(fc
);
1439 hdr
.duration_id
= 0;
1442 skip_header_bytes
= ETH_HLEN
;
1443 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1444 encaps_data
= bridge_tunnel_header
;
1445 encaps_len
= sizeof(bridge_tunnel_header
);
1446 skip_header_bytes
-= 2;
1447 } else if (ethertype
>= 0x600) {
1448 encaps_data
= rfc1042_header
;
1449 encaps_len
= sizeof(rfc1042_header
);
1450 skip_header_bytes
-= 2;
1456 skb_pull(skb
, skip_header_bytes
);
1457 nh_pos
-= skip_header_bytes
;
1458 h_pos
-= skip_header_bytes
;
1460 /* TODO: implement support for fragments so that there is no need to
1461 * reallocate and copy payload; it might be enough to support one
1462 * extra fragment that would be copied in the beginning of the frame
1463 * data.. anyway, it would be nice to include this into skb structure
1466 * There are few options for this:
1467 * use skb->cb as an extra space for 802.11 header
1468 * allocate new buffer if not enough headroom
1469 * make sure that there is enough headroom in every skb by increasing
1470 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1471 * alloc_skb() (net/core/skbuff.c)
1473 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1474 head_need
-= skb_headroom(skb
);
1476 /* We are going to modify skb data, so make a copy of it if happens to
1477 * be cloned. This could happen, e.g., with Linux bridge code passing
1478 * us broadcast frames. */
1480 if (head_need
> 0 || skb_cloned(skb
)) {
1482 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1483 "of headroom\n", dev
->name
, head_need
);
1486 if (skb_cloned(skb
))
1487 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1489 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1490 /* Since we have to reallocate the buffer, make sure that there
1491 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1492 * before payload and 12 after). */
1493 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1495 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1502 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1503 nh_pos
+= encaps_len
;
1504 h_pos
+= encaps_len
;
1507 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1508 __le16
*qos_control
;
1510 qos_control
= (__le16
*) skb_push(skb
, 2);
1511 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1513 * Maybe we could actually set some fields here, for now just
1514 * initialise to zero to indicate no special operation.
1518 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1523 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1524 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1525 pkt_data
->ifindex
= dev
->ifindex
;
1526 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1527 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1529 skb
->dev
= local
->mdev
;
1530 dev
->stats
.tx_packets
++;
1531 dev
->stats
.tx_bytes
+= skb
->len
;
1533 /* Update skb pointers to various headers since this modified frame
1534 * is going to go through Linux networking code that may potentially
1535 * need things like pointer to IP header. */
1536 skb_set_mac_header(skb
, 0);
1537 skb_set_network_header(skb
, nh_pos
);
1538 skb_set_transport_header(skb
, h_pos
);
1540 dev
->trans_start
= jiffies
;
1541 dev_queue_xmit(skb
);
1553 * This is the transmit routine for the 802.11 type interfaces
1554 * called by upper layers of the linux networking
1555 * stack when it has a frame to transmit
1557 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1559 struct ieee80211_sub_if_data
*sdata
;
1560 struct ieee80211_tx_packet_data
*pkt_data
;
1561 struct ieee80211_hdr
*hdr
;
1564 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1566 if (skb
->len
< 10) {
1571 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1572 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1579 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1580 fc
= le16_to_cpu(hdr
->frame_control
);
1582 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1583 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1584 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1585 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1586 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1588 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1589 skb
->dev
= sdata
->local
->mdev
;
1592 * We're using the protocol field of the the frame control header
1593 * to request TX callback for hostapd. BIT(1) is checked.
1595 if ((fc
& BIT(1)) == BIT(1)) {
1596 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1598 hdr
->frame_control
= cpu_to_le16(fc
);
1601 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1602 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1604 dev
->stats
.tx_packets
++;
1605 dev
->stats
.tx_bytes
+= skb
->len
;
1607 dev_queue_xmit(skb
);
1612 /* helper functions for pending packets for when queues are stopped */
1614 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1617 struct ieee80211_tx_stored_packet
*store
;
1619 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1620 if (!__ieee80211_queue_pending(local
, i
))
1622 store
= &local
->pending_packet
[i
];
1623 kfree_skb(store
->skb
);
1624 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1625 kfree_skb(store
->extra_frag
[j
]);
1626 kfree(store
->extra_frag
);
1627 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1631 void ieee80211_tx_pending(unsigned long data
)
1633 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1634 struct net_device
*dev
= local
->mdev
;
1635 struct ieee80211_tx_stored_packet
*store
;
1636 struct ieee80211_txrx_data tx
;
1637 int i
, ret
, reschedule
= 0;
1639 netif_tx_lock_bh(dev
);
1640 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1641 if (__ieee80211_queue_stopped(local
, i
))
1643 if (!__ieee80211_queue_pending(local
, i
)) {
1647 store
= &local
->pending_packet
[i
];
1648 tx
.u
.tx
.control
= &store
->control
;
1649 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1650 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1651 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1652 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1654 if (store
->last_frag_rate_ctrl_probe
)
1655 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1656 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1658 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1661 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1666 netif_tx_unlock_bh(dev
);
1668 if (!ieee80211_qdisc_installed(dev
)) {
1669 if (!__ieee80211_queue_stopped(local
, 0))
1670 netif_wake_queue(dev
);
1672 netif_schedule(dev
);
1676 /* functions for drivers to get certain frames */
1678 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1679 struct ieee80211_if_ap
*bss
,
1680 struct sk_buff
*skb
)
1684 int i
, have_bits
= 0, n1
, n2
;
1686 /* Generate bitmap for TIM only if there are any STAs in power save
1688 read_lock_bh(&local
->sta_lock
);
1689 if (atomic_read(&bss
->num_sta_ps
) > 0)
1690 /* in the hope that this is faster than
1691 * checking byte-for-byte */
1692 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1693 IEEE80211_MAX_AID
+1);
1695 if (bss
->dtim_count
== 0)
1696 bss
->dtim_count
= bss
->dtim_period
- 1;
1700 tim
= pos
= (u8
*) skb_put(skb
, 6);
1701 *pos
++ = WLAN_EID_TIM
;
1703 *pos
++ = bss
->dtim_count
;
1704 *pos
++ = bss
->dtim_period
;
1706 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1710 /* Find largest even number N1 so that bits numbered 1 through
1711 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1712 * (N2 + 1) x 8 through 2007 are 0. */
1714 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1721 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1728 /* Bitmap control */
1730 /* Part Virt Bitmap */
1731 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1733 tim
[1] = n2
- n1
+ 4;
1734 skb_put(skb
, n2
- n1
);
1736 *pos
++ = aid0
; /* Bitmap control */
1737 *pos
++ = 0; /* Part Virt Bitmap */
1739 read_unlock_bh(&local
->sta_lock
);
1742 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1743 struct ieee80211_tx_control
*control
)
1745 struct ieee80211_local
*local
= hw_to_local(hw
);
1746 struct sk_buff
*skb
;
1747 struct net_device
*bdev
;
1748 struct ieee80211_sub_if_data
*sdata
= NULL
;
1749 struct ieee80211_if_ap
*ap
= NULL
;
1750 struct ieee80211_rate
*rate
;
1751 struct rate_control_extra extra
;
1752 u8
*b_head
, *b_tail
;
1755 bdev
= dev_get_by_index(&init_net
, if_id
);
1757 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1762 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1764 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1765 if (net_ratelimit())
1766 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1767 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1768 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1772 /* Assume we are generating the normal beacon locally */
1773 b_head
= ap
->beacon_head
;
1774 b_tail
= ap
->beacon_tail
;
1775 bh_len
= ap
->beacon_head_len
;
1776 bt_len
= ap
->beacon_tail_len
;
1778 skb
= dev_alloc_skb(local
->tx_headroom
+
1779 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1783 skb_reserve(skb
, local
->tx_headroom
);
1784 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1786 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1788 ieee80211_beacon_add_tim(local
, ap
, skb
);
1791 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1795 memset(&extra
, 0, sizeof(extra
));
1796 extra
.mode
= local
->oper_hw_mode
;
1798 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1800 if (net_ratelimit()) {
1801 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1802 "found\n", local
->mdev
->name
);
1809 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1810 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1811 rate
->val2
: rate
->val
;
1812 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1813 control
->power_level
= local
->hw
.conf
.power_level
;
1814 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1815 control
->retry_limit
= 1;
1816 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1822 EXPORT_SYMBOL(ieee80211_beacon_get
);
1824 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1825 const void *frame
, size_t frame_len
,
1826 const struct ieee80211_tx_control
*frame_txctl
,
1827 struct ieee80211_rts
*rts
)
1829 const struct ieee80211_hdr
*hdr
= frame
;
1832 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1833 rts
->frame_control
= cpu_to_le16(fctl
);
1834 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1835 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1836 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1838 EXPORT_SYMBOL(ieee80211_rts_get
);
1840 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1841 const void *frame
, size_t frame_len
,
1842 const struct ieee80211_tx_control
*frame_txctl
,
1843 struct ieee80211_cts
*cts
)
1845 const struct ieee80211_hdr
*hdr
= frame
;
1848 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1849 cts
->frame_control
= cpu_to_le16(fctl
);
1850 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1851 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1853 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1856 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1857 struct ieee80211_tx_control
*control
)
1859 struct ieee80211_local
*local
= hw_to_local(hw
);
1860 struct sk_buff
*skb
;
1861 struct sta_info
*sta
;
1862 ieee80211_tx_handler
*handler
;
1863 struct ieee80211_txrx_data tx
;
1864 ieee80211_txrx_result res
= TXRX_DROP
;
1865 struct net_device
*bdev
;
1866 struct ieee80211_sub_if_data
*sdata
;
1867 struct ieee80211_if_ap
*bss
= NULL
;
1869 bdev
= dev_get_by_index(&init_net
, if_id
);
1871 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1875 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1878 if (bss
->dtim_count
!= 0)
1879 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1880 memset(control
, 0, sizeof(*control
));
1882 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1885 local
->total_ps_buffered
--;
1887 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1888 struct ieee80211_hdr
*hdr
=
1889 (struct ieee80211_hdr
*) skb
->data
;
1890 /* more buffered multicast/broadcast frames ==> set
1891 * MoreData flag in IEEE 802.11 header to inform PS
1893 hdr
->frame_control
|=
1894 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1897 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1899 dev_kfree_skb_any(skb
);
1902 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1903 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1905 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1906 res
= (*handler
)(&tx
);
1907 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1911 skb
= tx
.skb
; /* handlers are allowed to change skb */
1913 if (res
== TXRX_DROP
) {
1914 I802_DEBUG_INC(local
->tx_handlers_drop
);
1917 } else if (res
== TXRX_QUEUED
) {
1918 I802_DEBUG_INC(local
->tx_handlers_queued
);
1927 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);