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
;
58 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
64 fc
= le16_to_cpu(hdr
->frame_control
);
65 hdrlen
= ieee80211_get_hdrlen(fc
);
66 if (hdrlen
> skb
->len
)
69 printk(" FC=0x%04x DUR=0x%04x",
70 fc
, le16_to_cpu(hdr
->duration_id
));
72 printk(" A1=" MAC_FMT
, MAC_ARG(hdr
->addr1
));
74 printk(" A2=" MAC_FMT
, MAC_ARG(hdr
->addr2
));
76 printk(" A3=" MAC_FMT
, MAC_ARG(hdr
->addr3
));
78 printk(" A4=" MAC_FMT
, MAC_ARG(hdr
->addr4
));
81 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
86 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
91 int rate
, mrate
, erp
, dur
, i
;
92 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
93 struct ieee80211_local
*local
= tx
->local
;
94 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
96 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
99 * data and mgmt (except PS Poll):
100 * - during CFP: 32768
101 * - during contention period:
102 * if addr1 is group address: 0
103 * if more fragments = 0 and addr1 is individual address: time to
104 * transmit one ACK plus SIFS
105 * if more fragments = 1 and addr1 is individual address: time to
106 * transmit next fragment plus 2 x ACK plus 3 x SIFS
109 * - control response frame (CTS or ACK) shall be transmitted using the
110 * same rate as the immediately previous frame in the frame exchange
111 * sequence, if this rate belongs to the PHY mandatory rates, or else
112 * at the highest possible rate belonging to the PHY rates in the
116 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
117 /* TODO: These control frames are not currently sent by
118 * 80211.o, but should they be implemented, this function
119 * needs to be updated to support duration field calculation.
121 * RTS: time needed to transmit pending data/mgmt frame plus
122 * one CTS frame plus one ACK frame plus 3 x SIFS
123 * CTS: duration of immediately previous RTS minus time
124 * required to transmit CTS and its SIFS
125 * ACK: 0 if immediately previous directed data/mgmt had
126 * more=0, with more=1 duration in ACK frame is duration
127 * from previous frame minus time needed to transmit ACK
129 * PS Poll: BIT(15) | BIT(14) | aid
135 if (0 /* FIX: data/mgmt during CFP */)
138 if (group_addr
) /* Group address as the destination - no ACK */
141 /* Individual destination address:
142 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
143 * CTS and ACK frames shall be transmitted using the highest rate in
144 * basic rate set that is less than or equal to the rate of the
145 * immediately previous frame and that is using the same modulation
146 * (CCK or OFDM). If no basic rate set matches with these requirements,
147 * the highest mandatory rate of the PHY that is less than or equal to
148 * the rate of the previous frame is used.
149 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
152 mrate
= 10; /* use 1 Mbps if everything fails */
153 for (i
= 0; i
< mode
->num_rates
; i
++) {
154 struct ieee80211_rate
*r
= &mode
->rates
[i
];
155 if (r
->rate
> txrate
->rate
)
158 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
159 IEEE80211_RATE_MODULATION(r
->flags
))
162 if (r
->flags
& IEEE80211_RATE_BASIC
)
164 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
168 /* No matching basic rate found; use highest suitable mandatory
173 /* Time needed to transmit ACK
174 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
175 * to closest integer */
177 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
178 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
181 /* Frame is fragmented: duration increases with time needed to
182 * transmit next fragment plus ACK and 2 x SIFS. */
183 dur
*= 2; /* ACK + SIFS */
185 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
188 IEEE80211_SDATA_SHORT_PREAMBLE
);
194 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
197 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
200 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
203 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
206 static int inline is_ieee80211_device(struct net_device
*dev
,
207 struct net_device
*master
)
209 return (wdev_priv(dev
->ieee80211_ptr
) ==
210 wdev_priv(master
->ieee80211_ptr
));
215 static ieee80211_txrx_result
216 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219 struct sk_buff
*skb
= tx
->skb
;
220 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
221 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
224 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
225 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
226 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
229 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
230 return TXRX_CONTINUE
;
232 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
234 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
235 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
236 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
237 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 printk(KERN_DEBUG
"%s: dropped data frame to not "
240 "associated station " MAC_FMT
"\n",
241 tx
->dev
->name
, MAC_ARG(hdr
->addr1
));
242 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
243 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
247 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
248 tx
->local
->num_sta
== 0 &&
249 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
251 * No associated STAs - no need to send multicast
256 return TXRX_CONTINUE
;
259 if (unlikely(!tx
->u
.tx
.mgmt_interface
&& tx
->sdata
->ieee802_1x
&&
260 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 printk(KERN_DEBUG
"%s: dropped frame to " MAC_FMT
263 " (unauthorized port)\n", tx
->dev
->name
,
264 MAC_ARG(hdr
->addr1
));
266 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
270 return TXRX_CONTINUE
;
273 static ieee80211_txrx_result
274 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
276 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
278 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
279 ieee80211_include_sequence(tx
->sdata
, hdr
);
281 return TXRX_CONTINUE
;
284 /* This function is called whenever the AP is about to exceed the maximum limit
285 * of buffered frames for power saving STAs. This situation should not really
286 * happen often during normal operation, so dropping the oldest buffered packet
287 * from each queue should be OK to make some room for new frames. */
288 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
290 int total
= 0, purged
= 0;
292 struct ieee80211_sub_if_data
*sdata
;
293 struct sta_info
*sta
;
295 read_lock(&local
->sub_if_lock
);
296 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
297 struct ieee80211_if_ap
*ap
;
298 if (sdata
->dev
== local
->mdev
||
299 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
302 skb
= skb_dequeue(&ap
->ps_bc_buf
);
307 total
+= skb_queue_len(&ap
->ps_bc_buf
);
309 read_unlock(&local
->sub_if_lock
);
311 read_lock_bh(&local
->sta_lock
);
312 list_for_each_entry(sta
, &local
->sta_list
, list
) {
313 skb
= skb_dequeue(&sta
->ps_tx_buf
);
318 total
+= skb_queue_len(&sta
->ps_tx_buf
);
320 read_unlock_bh(&local
->sta_lock
);
322 local
->total_ps_buffered
= total
;
323 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
324 local
->mdev
->name
, purged
);
327 static inline ieee80211_txrx_result
328 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
330 /* broadcast/multicast frame */
331 /* If any of the associated stations is in power save mode,
332 * the frame is buffered to be sent after DTIM beacon frame */
333 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
334 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
335 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
336 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
337 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
338 purge_old_ps_buffers(tx
->local
);
339 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
341 if (net_ratelimit()) {
342 printk(KERN_DEBUG
"%s: BC TX buffer full - "
343 "dropping the oldest frame\n",
346 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
348 tx
->local
->total_ps_buffered
++;
349 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
353 return TXRX_CONTINUE
;
356 static inline ieee80211_txrx_result
357 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
359 struct sta_info
*sta
= tx
->sta
;
362 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
363 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
364 return TXRX_CONTINUE
;
366 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
367 struct ieee80211_tx_packet_data
*pkt_data
;
368 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS buffer (entries "
371 MAC_ARG(sta
->addr
), sta
->aid
,
372 skb_queue_len(&sta
->ps_tx_buf
));
373 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
374 sta
->flags
|= WLAN_STA_TIM
;
375 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
376 purge_old_ps_buffers(tx
->local
);
377 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
378 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
379 if (net_ratelimit()) {
380 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" TX "
381 "buffer full - dropping oldest frame\n",
382 tx
->dev
->name
, MAC_ARG(sta
->addr
));
386 tx
->local
->total_ps_buffered
++;
387 /* Queue frame to be sent after STA sends an PS Poll frame */
388 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
389 if (tx
->local
->ops
->set_tim
)
390 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
393 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
395 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
396 pkt_data
->jiffies
= jiffies
;
397 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
402 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" in PS mode, but pspoll "
403 "set -> send frame\n", tx
->dev
->name
,
406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
409 return TXRX_CONTINUE
;
413 static ieee80211_txrx_result
414 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
416 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
417 return TXRX_CONTINUE
;
419 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
420 return ieee80211_tx_h_unicast_ps_buf(tx
);
422 return ieee80211_tx_h_multicast_ps_buf(tx
);
428 static ieee80211_txrx_result
429 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
431 struct ieee80211_key
*key
;
433 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
435 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
437 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
439 else if (tx
->sdata
->drop_unencrypted
&&
440 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
441 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
445 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
449 tx
->key
->tx_rx_count
++;
450 if (unlikely(tx
->local
->key_tx_rx_threshold
&&
451 tx
->key
->tx_rx_count
>
452 tx
->local
->key_tx_rx_threshold
)) {
453 ieee80211_key_threshold_notify(tx
->dev
, tx
->key
,
458 return TXRX_CONTINUE
;
461 static ieee80211_txrx_result
462 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
464 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
465 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
466 struct sk_buff
**frags
, *first
, *frag
;
470 int frag_threshold
= tx
->local
->fragmentation_threshold
;
472 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
473 return TXRX_CONTINUE
;
477 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
478 payload_len
= first
->len
- hdrlen
;
479 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
480 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
482 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
486 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
487 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
488 pos
= first
->data
+ hdrlen
+ per_fragm
;
489 left
= payload_len
- per_fragm
;
490 for (i
= 0; i
< num_fragm
- 1; i
++) {
491 struct ieee80211_hdr
*fhdr
;
497 /* reserve enough extra head and tail room for possible
500 dev_alloc_skb(tx
->local
->tx_headroom
+
502 IEEE80211_ENCRYPT_HEADROOM
+
503 IEEE80211_ENCRYPT_TAILROOM
);
506 /* Make sure that all fragments use the same priority so
507 * that they end up using the same TX queue */
508 frag
->priority
= first
->priority
;
509 skb_reserve(frag
, tx
->local
->tx_headroom
+
510 IEEE80211_ENCRYPT_HEADROOM
);
511 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
512 memcpy(fhdr
, first
->data
, hdrlen
);
513 if (i
== num_fragm
- 2)
514 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
515 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
516 copylen
= left
> per_fragm
? per_fragm
: left
;
517 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
522 skb_trim(first
, hdrlen
+ per_fragm
);
524 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
525 tx
->u
.tx
.extra_frag
= frags
;
527 return TXRX_CONTINUE
;
530 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
532 for (i
= 0; i
< num_fragm
- 1; i
++)
534 dev_kfree_skb(frags
[i
]);
537 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
541 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
543 if (!(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)) {
544 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
547 tx
->u
.tx
.control
->key_idx
= tx
->key
->conf
.hw_key_idx
;
548 if (tx
->key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) {
549 if (!ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
))
556 static ieee80211_txrx_result
557 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
559 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
562 fc
= le16_to_cpu(hdr
->frame_control
);
564 if (!tx
->key
|| tx
->key
->conf
.alg
!= ALG_WEP
||
565 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
566 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
567 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
568 return TXRX_CONTINUE
;
570 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
571 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
572 ieee80211_tx_set_iswep(tx
);
574 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
575 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
579 if (tx
->u
.tx
.extra_frag
) {
581 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
582 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
583 I802_DEBUG_INC(tx
->local
->
584 tx_handlers_drop_wep
);
590 return TXRX_CONTINUE
;
593 static ieee80211_txrx_result
594 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
596 struct rate_control_extra extra
;
598 memset(&extra
, 0, sizeof(extra
));
599 extra
.mode
= tx
->u
.tx
.mode
;
600 extra
.mgmt_data
= tx
->sdata
&&
601 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
602 extra
.ethertype
= tx
->ethertype
;
604 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
606 if (unlikely(extra
.probe
!= NULL
)) {
607 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
608 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
609 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
610 tx
->u
.tx
.rate
= extra
.probe
;
612 tx
->u
.tx
.control
->alt_retry_rate
= -1;
616 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
617 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
618 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
619 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
621 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
623 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
624 tx
->u
.tx
.rate
= extra
.nonerp
;
625 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
626 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
628 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
629 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
631 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
633 return TXRX_CONTINUE
;
636 static ieee80211_txrx_result
637 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
639 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
640 u16 fc
= le16_to_cpu(hdr
->frame_control
);
642 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
643 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
645 if (!is_multicast_ether_addr(hdr
->addr1
)) {
646 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
647 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
648 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
649 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
650 control
->retry_limit
=
651 tx
->local
->long_retry_limit
;
653 control
->retry_limit
=
654 tx
->local
->short_retry_limit
;
657 control
->retry_limit
= 1;
660 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
661 /* Do not use multiple retry rates when sending fragmented
663 * TODO: The last fragment could still use multiple retry
665 control
->alt_retry_rate
= -1;
668 /* Use CTS protection for unicast frames sent using extended rates if
669 * there are associated non-ERP stations and RTS/CTS is not configured
671 if (mode
->mode
== MODE_IEEE80211G
&&
672 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
673 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
674 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
675 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
676 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
678 /* Transmit data frames using short preambles if the driver supports
679 * short preambles at the selected rate and short preambles are
680 * available on the network at the current point in time. */
681 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
682 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
683 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
684 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
685 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
688 /* Setup duration field for the first fragment of the frame. Duration
689 * for remaining fragments will be updated when they are being sent
690 * to low-level driver in ieee80211_tx(). */
691 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
692 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
693 tx
->u
.tx
.extra_frag
[0]->len
: 0);
694 hdr
->duration_id
= cpu_to_le16(dur
);
696 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
697 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
698 struct ieee80211_rate
*rate
;
700 /* Do not use multiple retry rates when using RTS/CTS */
701 control
->alt_retry_rate
= -1;
703 /* Use min(data rate, max base rate) as CTS/RTS rate */
704 rate
= tx
->u
.tx
.rate
;
705 while (rate
> mode
->rates
&&
706 !(rate
->flags
& IEEE80211_RATE_BASIC
))
709 control
->rts_cts_rate
= rate
->val
;
710 control
->rts_rate
= rate
;
714 tx
->sta
->tx_packets
++;
715 tx
->sta
->tx_fragments
++;
716 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
717 if (tx
->u
.tx
.extra_frag
) {
719 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
720 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
722 tx
->u
.tx
.extra_frag
[i
]->len
;
728 * Tell hardware to not encrypt when we had sw crypto.
729 * Because we use the same flag to internally indicate that
730 * no (software) encryption should be done, we have to set it
731 * after all crypto handlers.
733 if (tx
->key
&& !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
734 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
736 return TXRX_CONTINUE
;
739 static ieee80211_txrx_result
740 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
742 struct ieee80211_local
*local
= tx
->local
;
743 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
744 struct sk_buff
*skb
= tx
->skb
;
745 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
746 u32 load
= 0, hdrtime
;
748 /* TODO: this could be part of tx_status handling, so that the number
749 * of retries would be known; TX rate should in that case be stored
750 * somewhere with the packet */
752 /* Estimate total channel use caused by this frame */
754 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
755 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
757 if (mode
->mode
== MODE_IEEE80211A
||
758 (mode
->mode
== MODE_IEEE80211G
&&
759 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
760 hdrtime
= CHAN_UTIL_HDR_SHORT
;
762 hdrtime
= CHAN_UTIL_HDR_LONG
;
765 if (!is_multicast_ether_addr(hdr
->addr1
))
768 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
770 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
773 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
775 if (tx
->u
.tx
.extra_frag
) {
777 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
779 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
784 /* Divide channel_use by 8 to avoid wrapping around the counter */
785 load
>>= CHAN_UTIL_SHIFT
;
786 local
->channel_use_raw
+= load
;
788 tx
->sta
->channel_use_raw
+= load
;
789 tx
->sdata
->channel_use_raw
+= load
;
791 return TXRX_CONTINUE
;
794 /* TODO: implement register/unregister functions for adding TX/RX handlers
795 * into ordered list */
797 ieee80211_tx_handler ieee80211_tx_handlers
[] =
799 ieee80211_tx_h_check_assoc
,
800 ieee80211_tx_h_sequence
,
801 ieee80211_tx_h_ps_buf
,
802 ieee80211_tx_h_select_key
,
803 ieee80211_tx_h_michael_mic_add
,
804 ieee80211_tx_h_fragment
,
805 ieee80211_tx_h_tkip_encrypt
,
806 ieee80211_tx_h_ccmp_encrypt
,
807 ieee80211_tx_h_wep_encrypt
,
808 ieee80211_tx_h_rate_ctrl
,
810 ieee80211_tx_h_load_stats
,
814 /* actual transmit path */
817 * deal with packet injection down monitor interface
818 * with Radiotap Header -- only called for monitor mode interface
820 static ieee80211_txrx_result
821 __ieee80211_parse_tx_radiotap(
822 struct ieee80211_txrx_data
*tx
,
823 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
826 * this is the moment to interpret and discard the radiotap header that
827 * must be at the start of the packet injected in Monitor mode
829 * Need to take some care with endian-ness since radiotap
830 * args are little-endian
833 struct ieee80211_radiotap_iterator iterator
;
834 struct ieee80211_radiotap_header
*rthdr
=
835 (struct ieee80211_radiotap_header
*) skb
->data
;
836 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
837 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
840 * default control situation for all injected packets
841 * FIXME: this does not suit all usage cases, expand to allow control
844 control
->retry_limit
= 1; /* no retry */
845 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
846 IEEE80211_TXCTL_USE_CTS_PROTECT
);
847 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
848 IEEE80211_TXCTL_NO_ACK
;
849 control
->antenna_sel_tx
= 0; /* default to default antenna */
852 * for every radiotap entry that is present
853 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
854 * entries present, or -EINVAL on error)
860 ret
= ieee80211_radiotap_iterator_next(&iterator
);
865 /* see if this argument is something we can use */
866 switch (iterator
.this_arg_index
) {
868 * You must take care when dereferencing iterator.this_arg
869 * for multibyte types... the pointer is not aligned. Use
870 * get_unaligned((type *)iterator.this_arg) to dereference
871 * iterator.this_arg for type "type" safely on all arches.
873 case IEEE80211_RADIOTAP_RATE
:
875 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
876 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
878 target_rate
= (*iterator
.this_arg
) * 5;
879 for (i
= 0; i
< mode
->num_rates
; i
++) {
880 struct ieee80211_rate
*r
= &mode
->rates
[i
];
882 if (r
->rate
> target_rate
)
887 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
888 control
->tx_rate
= r
->val2
;
890 control
->tx_rate
= r
->val
;
892 /* end on exact match */
893 if (r
->rate
== target_rate
)
898 case IEEE80211_RADIOTAP_ANTENNA
:
900 * radiotap uses 0 for 1st ant, mac80211 is 1 for
903 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
906 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
907 control
->power_level
= *iterator
.this_arg
;
910 case IEEE80211_RADIOTAP_FLAGS
:
911 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
913 * this indicates that the skb we have been
914 * handed has the 32-bit FCS CRC at the end...
915 * we should react to that by snipping it off
916 * because it will be recomputed and added
919 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
922 skb_trim(skb
, skb
->len
- FCS_LEN
);
931 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
935 * remove the radiotap header
936 * iterator->max_length was sanity-checked against
937 * skb->len by iterator init
939 skb_pull(skb
, iterator
.max_length
);
941 return TXRX_CONTINUE
;
944 static ieee80211_txrx_result
inline
945 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
947 struct net_device
*dev
,
948 struct ieee80211_tx_control
*control
)
950 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
951 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
952 struct ieee80211_sub_if_data
*sdata
;
953 ieee80211_txrx_result res
= TXRX_CONTINUE
;
957 memset(tx
, 0, sizeof(*tx
));
959 tx
->dev
= dev
; /* use original interface */
961 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
964 * set defaults for things that can be set by
965 * injected radiotap headers
967 control
->power_level
= local
->hw
.conf
.power_level
;
968 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
970 /* process and remove the injection radiotap header */
971 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
972 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
973 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
978 * we removed the radiotap header after this point,
979 * we filled control with what we could use
980 * set to the actual ieee header now
982 hdr
= (struct ieee80211_hdr
*) skb
->data
;
983 res
= TXRX_QUEUED
; /* indication it was monitor packet */
986 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
987 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
988 tx
->u
.tx
.control
= control
;
989 if (is_multicast_ether_addr(hdr
->addr1
)) {
990 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
991 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
993 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
994 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
996 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
997 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
998 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
999 !local
->ops
->set_frag_threshold
)
1000 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
1002 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
1004 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1005 else if (tx
->sta
->clear_dst_mask
) {
1006 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1007 tx
->sta
->clear_dst_mask
= 0;
1009 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1010 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1011 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1012 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1014 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1019 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1020 * finished with it. */
1021 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1022 struct sk_buff
*skb
,
1023 struct net_device
*mdev
,
1024 struct ieee80211_tx_control
*control
)
1026 struct ieee80211_tx_packet_data
*pkt_data
;
1027 struct net_device
*dev
;
1029 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1030 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1031 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1037 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1041 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1042 struct ieee80211_txrx_data
*tx
)
1044 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1047 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1048 __ieee80211_queue_stopped(local
, 0)) {
1049 netif_stop_queue(local
->mdev
);
1050 return IEEE80211_TX_AGAIN
;
1053 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1054 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1056 return IEEE80211_TX_AGAIN
;
1057 local
->mdev
->trans_start
= jiffies
;
1058 ieee80211_led_tx(local
, 1);
1060 if (tx
->u
.tx
.extra_frag
) {
1061 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1062 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1063 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1064 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1065 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1066 if (!tx
->u
.tx
.extra_frag
[i
])
1068 if (__ieee80211_queue_stopped(local
, control
->queue
))
1069 return IEEE80211_TX_FRAG_AGAIN
;
1070 if (i
== tx
->u
.tx
.num_extra_frag
) {
1071 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1072 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1073 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1075 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1078 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1081 ieee80211_dump_frame(local
->mdev
->name
,
1082 "TX to low-level driver",
1083 tx
->u
.tx
.extra_frag
[i
]);
1084 ret
= local
->ops
->tx(local_to_hw(local
),
1085 tx
->u
.tx
.extra_frag
[i
],
1088 return IEEE80211_TX_FRAG_AGAIN
;
1089 local
->mdev
->trans_start
= jiffies
;
1090 ieee80211_led_tx(local
, 1);
1091 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1093 kfree(tx
->u
.tx
.extra_frag
);
1094 tx
->u
.tx
.extra_frag
= NULL
;
1096 return IEEE80211_TX_OK
;
1099 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1100 struct ieee80211_tx_control
*control
, int mgmt
)
1102 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1103 struct sta_info
*sta
;
1104 ieee80211_tx_handler
*handler
;
1105 struct ieee80211_txrx_data tx
;
1106 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1109 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1111 if (unlikely(skb
->len
< 10)) {
1116 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1118 if (res_prepare
== TXRX_DROP
) {
1124 * key references are protected using RCU and this requires that
1125 * we are in a read-site RCU section during receive processing
1130 tx
.u
.tx
.mgmt_interface
= mgmt
;
1131 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1133 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1134 res
= TXRX_CONTINUE
;
1136 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1138 res
= (*handler
)(&tx
);
1139 if (res
!= TXRX_CONTINUE
)
1144 skb
= tx
.skb
; /* handlers are allowed to change skb */
1149 if (unlikely(res
== TXRX_DROP
)) {
1150 I802_DEBUG_INC(local
->tx_handlers_drop
);
1154 if (unlikely(res
== TXRX_QUEUED
)) {
1155 I802_DEBUG_INC(local
->tx_handlers_queued
);
1160 if (tx
.u
.tx
.extra_frag
) {
1161 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1163 struct ieee80211_hdr
*hdr
=
1164 (struct ieee80211_hdr
*)
1165 tx
.u
.tx
.extra_frag
[i
]->data
;
1167 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1168 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1171 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1172 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1174 dur
= ieee80211_duration(&tx
, 0, next_len
);
1175 hdr
->duration_id
= cpu_to_le16(dur
);
1180 ret
= __ieee80211_tx(local
, skb
, &tx
);
1182 struct ieee80211_tx_stored_packet
*store
=
1183 &local
->pending_packet
[control
->queue
];
1185 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1187 set_bit(IEEE80211_LINK_STATE_PENDING
,
1188 &local
->state
[control
->queue
]);
1190 /* When the driver gets out of buffers during sending of
1191 * fragments and calls ieee80211_stop_queue, there is
1192 * a small window between IEEE80211_LINK_STATE_XOFF and
1193 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1194 * gets available in that window (i.e. driver calls
1195 * ieee80211_wake_queue), we would end up with ieee80211_tx
1196 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1197 * continuing transmitting here when that situation is
1198 * possible to have happened. */
1199 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1200 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1201 &local
->state
[control
->queue
]);
1204 memcpy(&store
->control
, control
,
1205 sizeof(struct ieee80211_tx_control
));
1207 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1208 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1209 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1210 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1211 store
->last_frag_rate_ctrl_probe
=
1212 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1220 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1221 if (tx
.u
.tx
.extra_frag
[i
])
1222 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1223 kfree(tx
.u
.tx
.extra_frag
);
1228 /* device xmit handlers */
1230 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1231 struct net_device
*dev
)
1233 struct ieee80211_tx_control control
;
1234 struct ieee80211_tx_packet_data
*pkt_data
;
1235 struct net_device
*odev
= NULL
;
1236 struct ieee80211_sub_if_data
*osdata
;
1241 * copy control out of the skb so other people can use skb->cb
1243 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1244 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1246 if (pkt_data
->ifindex
)
1247 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1248 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1252 if (unlikely(!odev
)) {
1253 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1254 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1255 "originating device\n", dev
->name
);
1260 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1262 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1263 if (skb_headroom(skb
) < headroom
) {
1264 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1271 control
.ifindex
= odev
->ifindex
;
1272 control
.type
= osdata
->type
;
1273 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1274 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1275 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1276 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1277 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1278 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1279 control
.queue
= pkt_data
->queue
;
1281 ret
= ieee80211_tx(odev
, skb
, &control
,
1282 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1288 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1289 struct net_device
*dev
)
1291 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1292 struct ieee80211_tx_packet_data
*pkt_data
;
1293 struct ieee80211_radiotap_header
*prthdr
=
1294 (struct ieee80211_radiotap_header
*)skb
->data
;
1297 /* check for not even having the fixed radiotap header part */
1298 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1299 goto fail
; /* too short to be possibly valid */
1301 /* is it a header version we can trust to find length from? */
1302 if (unlikely(prthdr
->it_version
))
1303 goto fail
; /* only version 0 is supported */
1305 /* then there must be a radiotap header with a length we can use */
1306 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1308 /* does the skb contain enough to deliver on the alleged length? */
1309 if (unlikely(skb
->len
< len_rthdr
))
1310 goto fail
; /* skb too short for claimed rt header extent */
1312 skb
->dev
= local
->mdev
;
1314 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1315 memset(pkt_data
, 0, sizeof(*pkt_data
));
1316 /* needed because we set skb device to master */
1317 pkt_data
->ifindex
= dev
->ifindex
;
1319 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1322 * fix up the pointers accounting for the radiotap
1323 * header still being in there. We are being given
1324 * a precooked IEEE80211 header so no need for
1327 skb_set_mac_header(skb
, len_rthdr
);
1329 * these are just fixed to the end of the rt area since we
1330 * don't have any better information and at this point, nobody cares
1332 skb_set_network_header(skb
, len_rthdr
);
1333 skb_set_transport_header(skb
, len_rthdr
);
1335 /* pass the radiotap header up to the next stage intact */
1336 dev_queue_xmit(skb
);
1337 return NETDEV_TX_OK
;
1341 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1345 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1346 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1347 * @skb: packet to be sent
1348 * @dev: incoming interface
1350 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1351 * not be freed, and caller is responsible for either retrying later or freeing
1354 * This function takes in an Ethernet header and encapsulates it with suitable
1355 * IEEE 802.11 header based on which interface the packet is coming in. The
1356 * encapsulated packet will then be passed to master interface, wlan#.11, for
1357 * transmission (through low-level driver).
1359 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1360 struct net_device
*dev
)
1362 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1363 struct ieee80211_tx_packet_data
*pkt_data
;
1364 struct ieee80211_sub_if_data
*sdata
;
1365 int ret
= 1, head_need
;
1366 u16 ethertype
, hdrlen
, fc
;
1367 struct ieee80211_hdr hdr
;
1368 const u8
*encaps_data
;
1369 int encaps_len
, skip_header_bytes
;
1371 struct sta_info
*sta
;
1373 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1374 if (unlikely(skb
->len
< ETH_HLEN
)) {
1375 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1376 dev
->name
, skb
->len
);
1381 nh_pos
= skb_network_header(skb
) - skb
->data
;
1382 h_pos
= skb_transport_header(skb
) - skb
->data
;
1384 /* convert Ethernet header to proper 802.11 header (based on
1385 * operation mode) */
1386 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1387 /* TODO: handling for 802.1x authorized/unauthorized port */
1388 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1390 switch (sdata
->type
) {
1391 case IEEE80211_IF_TYPE_AP
:
1392 case IEEE80211_IF_TYPE_VLAN
:
1393 fc
|= IEEE80211_FCTL_FROMDS
;
1395 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1396 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1397 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1400 case IEEE80211_IF_TYPE_WDS
:
1401 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1403 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1404 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1405 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1406 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1409 case IEEE80211_IF_TYPE_STA
:
1410 fc
|= IEEE80211_FCTL_TODS
;
1412 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1413 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1414 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1417 case IEEE80211_IF_TYPE_IBSS
:
1419 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1420 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1421 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1429 /* receiver is QoS enabled, use a QoS type frame */
1430 sta
= sta_info_get(local
, hdr
.addr1
);
1432 if (sta
->flags
& WLAN_STA_WME
) {
1433 fc
|= IEEE80211_STYPE_QOS_DATA
;
1439 hdr
.frame_control
= cpu_to_le16(fc
);
1440 hdr
.duration_id
= 0;
1443 skip_header_bytes
= ETH_HLEN
;
1444 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1445 encaps_data
= bridge_tunnel_header
;
1446 encaps_len
= sizeof(bridge_tunnel_header
);
1447 skip_header_bytes
-= 2;
1448 } else if (ethertype
>= 0x600) {
1449 encaps_data
= rfc1042_header
;
1450 encaps_len
= sizeof(rfc1042_header
);
1451 skip_header_bytes
-= 2;
1457 skb_pull(skb
, skip_header_bytes
);
1458 nh_pos
-= skip_header_bytes
;
1459 h_pos
-= skip_header_bytes
;
1461 /* TODO: implement support for fragments so that there is no need to
1462 * reallocate and copy payload; it might be enough to support one
1463 * extra fragment that would be copied in the beginning of the frame
1464 * data.. anyway, it would be nice to include this into skb structure
1467 * There are few options for this:
1468 * use skb->cb as an extra space for 802.11 header
1469 * allocate new buffer if not enough headroom
1470 * make sure that there is enough headroom in every skb by increasing
1471 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1472 * alloc_skb() (net/core/skbuff.c)
1474 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1475 head_need
-= skb_headroom(skb
);
1477 /* We are going to modify skb data, so make a copy of it if happens to
1478 * be cloned. This could happen, e.g., with Linux bridge code passing
1479 * us broadcast frames. */
1481 if (head_need
> 0 || skb_cloned(skb
)) {
1483 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1484 "of headroom\n", dev
->name
, head_need
);
1487 if (skb_cloned(skb
))
1488 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1490 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1491 /* Since we have to reallocate the buffer, make sure that there
1492 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1493 * before payload and 12 after). */
1494 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1496 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1503 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1504 nh_pos
+= encaps_len
;
1505 h_pos
+= encaps_len
;
1508 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1509 __le16
*qos_control
;
1511 qos_control
= (__le16
*) skb_push(skb
, 2);
1512 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1514 * Maybe we could actually set some fields here, for now just
1515 * initialise to zero to indicate no special operation.
1519 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1524 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1525 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1526 pkt_data
->ifindex
= dev
->ifindex
;
1527 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1528 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1530 skb
->dev
= local
->mdev
;
1531 sdata
->stats
.tx_packets
++;
1532 sdata
->stats
.tx_bytes
+= skb
->len
;
1534 /* Update skb pointers to various headers since this modified frame
1535 * is going to go through Linux networking code that may potentially
1536 * need things like pointer to IP header. */
1537 skb_set_mac_header(skb
, 0);
1538 skb_set_network_header(skb
, nh_pos
);
1539 skb_set_transport_header(skb
, h_pos
);
1541 dev
->trans_start
= jiffies
;
1542 dev_queue_xmit(skb
);
1554 * This is the transmit routine for the 802.11 type interfaces
1555 * called by upper layers of the linux networking
1556 * stack when it has a frame to transmit
1558 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1560 struct ieee80211_sub_if_data
*sdata
;
1561 struct ieee80211_tx_packet_data
*pkt_data
;
1562 struct ieee80211_hdr
*hdr
;
1565 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1567 if (skb
->len
< 10) {
1572 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1573 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1580 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1581 fc
= le16_to_cpu(hdr
->frame_control
);
1583 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1584 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1585 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1586 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1587 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1589 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1590 skb
->dev
= sdata
->local
->mdev
;
1593 * We're using the protocol field of the the frame control header
1594 * to request TX callback for hostapd. BIT(1) is checked.
1596 if ((fc
& BIT(1)) == BIT(1)) {
1597 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1599 hdr
->frame_control
= cpu_to_le16(fc
);
1602 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1603 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1605 sdata
->stats
.tx_packets
++;
1606 sdata
->stats
.tx_bytes
+= skb
->len
;
1608 dev_queue_xmit(skb
);
1613 /* helper functions for pending packets for when queues are stopped */
1615 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1618 struct ieee80211_tx_stored_packet
*store
;
1620 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1621 if (!__ieee80211_queue_pending(local
, i
))
1623 store
= &local
->pending_packet
[i
];
1624 kfree_skb(store
->skb
);
1625 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1626 kfree_skb(store
->extra_frag
[j
]);
1627 kfree(store
->extra_frag
);
1628 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1632 void ieee80211_tx_pending(unsigned long data
)
1634 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1635 struct net_device
*dev
= local
->mdev
;
1636 struct ieee80211_tx_stored_packet
*store
;
1637 struct ieee80211_txrx_data tx
;
1638 int i
, ret
, reschedule
= 0;
1640 netif_tx_lock_bh(dev
);
1641 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1642 if (__ieee80211_queue_stopped(local
, i
))
1644 if (!__ieee80211_queue_pending(local
, i
)) {
1648 store
= &local
->pending_packet
[i
];
1649 tx
.u
.tx
.control
= &store
->control
;
1650 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1651 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1652 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1653 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1655 if (store
->last_frag_rate_ctrl_probe
)
1656 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1657 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1659 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1662 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1667 netif_tx_unlock_bh(dev
);
1669 if (!ieee80211_qdisc_installed(dev
)) {
1670 if (!__ieee80211_queue_stopped(local
, 0))
1671 netif_wake_queue(dev
);
1673 netif_schedule(dev
);
1677 /* functions for drivers to get certain frames */
1679 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1680 struct ieee80211_if_ap
*bss
,
1681 struct sk_buff
*skb
)
1685 int i
, have_bits
= 0, n1
, n2
;
1687 /* Generate bitmap for TIM only if there are any STAs in power save
1689 read_lock_bh(&local
->sta_lock
);
1690 if (atomic_read(&bss
->num_sta_ps
) > 0)
1691 /* in the hope that this is faster than
1692 * checking byte-for-byte */
1693 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1694 IEEE80211_MAX_AID
+1);
1696 if (bss
->dtim_count
== 0)
1697 bss
->dtim_count
= bss
->dtim_period
- 1;
1701 tim
= pos
= (u8
*) skb_put(skb
, 6);
1702 *pos
++ = WLAN_EID_TIM
;
1704 *pos
++ = bss
->dtim_count
;
1705 *pos
++ = bss
->dtim_period
;
1707 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1711 /* Find largest even number N1 so that bits numbered 1 through
1712 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1713 * (N2 + 1) x 8 through 2007 are 0. */
1715 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1722 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1729 /* Bitmap control */
1731 /* Part Virt Bitmap */
1732 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1734 tim
[1] = n2
- n1
+ 4;
1735 skb_put(skb
, n2
- n1
);
1737 *pos
++ = aid0
; /* Bitmap control */
1738 *pos
++ = 0; /* Part Virt Bitmap */
1740 read_unlock_bh(&local
->sta_lock
);
1743 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1744 struct ieee80211_tx_control
*control
)
1746 struct ieee80211_local
*local
= hw_to_local(hw
);
1747 struct sk_buff
*skb
;
1748 struct net_device
*bdev
;
1749 struct ieee80211_sub_if_data
*sdata
= NULL
;
1750 struct ieee80211_if_ap
*ap
= NULL
;
1751 struct ieee80211_rate
*rate
;
1752 struct rate_control_extra extra
;
1753 u8
*b_head
, *b_tail
;
1756 bdev
= dev_get_by_index(&init_net
, if_id
);
1758 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1763 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1765 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1766 if (net_ratelimit())
1767 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1768 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1769 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1773 /* Assume we are generating the normal beacon locally */
1774 b_head
= ap
->beacon_head
;
1775 b_tail
= ap
->beacon_tail
;
1776 bh_len
= ap
->beacon_head_len
;
1777 bt_len
= ap
->beacon_tail_len
;
1779 skb
= dev_alloc_skb(local
->tx_headroom
+
1780 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1784 skb_reserve(skb
, local
->tx_headroom
);
1785 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1787 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1789 ieee80211_beacon_add_tim(local
, ap
, skb
);
1792 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1796 memset(&extra
, 0, sizeof(extra
));
1797 extra
.mode
= local
->oper_hw_mode
;
1799 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1801 if (net_ratelimit()) {
1802 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1803 "found\n", local
->mdev
->name
);
1810 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1811 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1812 rate
->val2
: rate
->val
;
1813 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1814 control
->power_level
= local
->hw
.conf
.power_level
;
1815 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1816 control
->retry_limit
= 1;
1817 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1823 EXPORT_SYMBOL(ieee80211_beacon_get
);
1825 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1826 const void *frame
, size_t frame_len
,
1827 const struct ieee80211_tx_control
*frame_txctl
,
1828 struct ieee80211_rts
*rts
)
1830 const struct ieee80211_hdr
*hdr
= frame
;
1833 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1834 rts
->frame_control
= cpu_to_le16(fctl
);
1835 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1836 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1837 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1839 EXPORT_SYMBOL(ieee80211_rts_get
);
1841 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1842 const void *frame
, size_t frame_len
,
1843 const struct ieee80211_tx_control
*frame_txctl
,
1844 struct ieee80211_cts
*cts
)
1846 const struct ieee80211_hdr
*hdr
= frame
;
1849 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1850 cts
->frame_control
= cpu_to_le16(fctl
);
1851 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1852 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1854 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1857 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1858 struct ieee80211_tx_control
*control
)
1860 struct ieee80211_local
*local
= hw_to_local(hw
);
1861 struct sk_buff
*skb
;
1862 struct sta_info
*sta
;
1863 ieee80211_tx_handler
*handler
;
1864 struct ieee80211_txrx_data tx
;
1865 ieee80211_txrx_result res
= TXRX_DROP
;
1866 struct net_device
*bdev
;
1867 struct ieee80211_sub_if_data
*sdata
;
1868 struct ieee80211_if_ap
*bss
= NULL
;
1870 bdev
= dev_get_by_index(&init_net
, if_id
);
1872 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1876 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1879 if (bss
->dtim_count
!= 0)
1880 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1881 memset(control
, 0, sizeof(*control
));
1883 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1886 local
->total_ps_buffered
--;
1888 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1889 struct ieee80211_hdr
*hdr
=
1890 (struct ieee80211_hdr
*) skb
->data
;
1891 /* more buffered multicast/broadcast frames ==> set
1892 * MoreData flag in IEEE 802.11 header to inform PS
1894 hdr
->frame_control
|=
1895 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1898 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1900 dev_kfree_skb_any(skb
);
1903 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
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
);