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 <net/net_namespace.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <net/cfg80211.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "ieee80211_led.h"
31 #include "ieee80211_rate.h"
33 #define IEEE80211_TX_OK 0
34 #define IEEE80211_TX_AGAIN 1
35 #define IEEE80211_TX_FRAG_AGAIN 2
39 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
40 struct ieee80211_hdr
*hdr
)
42 /* Set the sequence number for this frame. */
43 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
45 /* Increase the sequence number. */
46 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
49 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
50 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
51 const struct sk_buff
*skb
)
53 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
57 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
63 fc
= le16_to_cpu(hdr
->frame_control
);
64 hdrlen
= ieee80211_get_hdrlen(fc
);
65 if (hdrlen
> skb
->len
)
68 printk(" FC=0x%04x DUR=0x%04x",
69 fc
, le16_to_cpu(hdr
->duration_id
));
71 printk(" A1=" MAC_FMT
, MAC_ARG(hdr
->addr1
));
73 printk(" A2=" MAC_FMT
, MAC_ARG(hdr
->addr2
));
75 printk(" A3=" MAC_FMT
, MAC_ARG(hdr
->addr3
));
77 printk(" A4=" MAC_FMT
, MAC_ARG(hdr
->addr4
));
80 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
81 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
85 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
87 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
90 int rate
, mrate
, erp
, dur
, i
;
91 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
92 struct ieee80211_local
*local
= tx
->local
;
93 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
95 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
98 * data and mgmt (except PS Poll):
100 * - during contention period:
101 * if addr1 is group address: 0
102 * if more fragments = 0 and addr1 is individual address: time to
103 * transmit one ACK plus SIFS
104 * if more fragments = 1 and addr1 is individual address: time to
105 * transmit next fragment plus 2 x ACK plus 3 x SIFS
108 * - control response frame (CTS or ACK) shall be transmitted using the
109 * same rate as the immediately previous frame in the frame exchange
110 * sequence, if this rate belongs to the PHY mandatory rates, or else
111 * at the highest possible rate belonging to the PHY rates in the
115 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
116 /* TODO: These control frames are not currently sent by
117 * 80211.o, but should they be implemented, this function
118 * needs to be updated to support duration field calculation.
120 * RTS: time needed to transmit pending data/mgmt frame plus
121 * one CTS frame plus one ACK frame plus 3 x SIFS
122 * CTS: duration of immediately previous RTS minus time
123 * required to transmit CTS and its SIFS
124 * ACK: 0 if immediately previous directed data/mgmt had
125 * more=0, with more=1 duration in ACK frame is duration
126 * from previous frame minus time needed to transmit ACK
128 * PS Poll: BIT(15) | BIT(14) | aid
134 if (0 /* FIX: data/mgmt during CFP */)
137 if (group_addr
) /* Group address as the destination - no ACK */
140 /* Individual destination address:
141 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
142 * CTS and ACK frames shall be transmitted using the highest rate in
143 * basic rate set that is less than or equal to the rate of the
144 * immediately previous frame and that is using the same modulation
145 * (CCK or OFDM). If no basic rate set matches with these requirements,
146 * the highest mandatory rate of the PHY that is less than or equal to
147 * the rate of the previous frame is used.
148 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
151 mrate
= 10; /* use 1 Mbps if everything fails */
152 for (i
= 0; i
< mode
->num_rates
; i
++) {
153 struct ieee80211_rate
*r
= &mode
->rates
[i
];
154 if (r
->rate
> txrate
->rate
)
157 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
158 IEEE80211_RATE_MODULATION(r
->flags
))
161 if (r
->flags
& IEEE80211_RATE_BASIC
)
163 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
167 /* No matching basic rate found; use highest suitable mandatory
172 /* Time needed to transmit ACK
173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
174 * to closest integer */
176 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
177 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
180 /* Frame is fragmented: duration increases with time needed to
181 * transmit next fragment plus ACK and 2 x SIFS. */
182 dur
*= 2; /* ACK + SIFS */
184 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
187 IEEE80211_SDATA_SHORT_PREAMBLE
);
193 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
196 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
199 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
202 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
205 static int inline is_ieee80211_device(struct net_device
*dev
,
206 struct net_device
*master
)
208 return (wdev_priv(dev
->ieee80211_ptr
) ==
209 wdev_priv(master
->ieee80211_ptr
));
214 static ieee80211_txrx_result
215 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
218 struct sk_buff
*skb
= tx
->skb
;
219 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
220 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
224 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
225 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
228 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
229 return TXRX_CONTINUE
;
231 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
233 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
234 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
235 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
236 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
237 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
238 printk(KERN_DEBUG
"%s: dropped data frame to not "
239 "associated station " MAC_FMT
"\n",
240 tx
->dev
->name
, MAC_ARG(hdr
->addr1
));
241 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
242 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
246 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
247 tx
->local
->num_sta
== 0 &&
248 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
250 * No associated STAs - no need to send multicast
255 return TXRX_CONTINUE
;
258 if (unlikely(!tx
->u
.tx
.mgmt_interface
&& tx
->sdata
->ieee802_1x
&&
259 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
260 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
261 printk(KERN_DEBUG
"%s: dropped frame to " MAC_FMT
262 " (unauthorized port)\n", tx
->dev
->name
,
263 MAC_ARG(hdr
->addr1
));
265 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
269 return TXRX_CONTINUE
;
272 static ieee80211_txrx_result
273 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
275 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
277 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
278 ieee80211_include_sequence(tx
->sdata
, hdr
);
280 return TXRX_CONTINUE
;
283 /* This function is called whenever the AP is about to exceed the maximum limit
284 * of buffered frames for power saving STAs. This situation should not really
285 * happen often during normal operation, so dropping the oldest buffered packet
286 * from each queue should be OK to make some room for new frames. */
287 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
289 int total
= 0, purged
= 0;
291 struct ieee80211_sub_if_data
*sdata
;
292 struct sta_info
*sta
;
294 read_lock(&local
->sub_if_lock
);
295 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
296 struct ieee80211_if_ap
*ap
;
297 if (sdata
->dev
== local
->mdev
||
298 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
301 skb
= skb_dequeue(&ap
->ps_bc_buf
);
306 total
+= skb_queue_len(&ap
->ps_bc_buf
);
308 read_unlock(&local
->sub_if_lock
);
310 read_lock_bh(&local
->sta_lock
);
311 list_for_each_entry(sta
, &local
->sta_list
, list
) {
312 skb
= skb_dequeue(&sta
->ps_tx_buf
);
317 total
+= skb_queue_len(&sta
->ps_tx_buf
);
319 read_unlock_bh(&local
->sta_lock
);
321 local
->total_ps_buffered
= total
;
322 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
323 local
->mdev
->name
, purged
);
326 static inline ieee80211_txrx_result
327 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
329 /* broadcast/multicast frame */
330 /* If any of the associated stations is in power save mode,
331 * the frame is buffered to be sent after DTIM beacon frame */
332 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
333 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
334 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
335 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
336 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
337 purge_old_ps_buffers(tx
->local
);
338 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
340 if (net_ratelimit()) {
341 printk(KERN_DEBUG
"%s: BC TX buffer full - "
342 "dropping the oldest frame\n",
345 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
347 tx
->local
->total_ps_buffered
++;
348 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
352 return TXRX_CONTINUE
;
355 static inline ieee80211_txrx_result
356 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
358 struct sta_info
*sta
= tx
->sta
;
361 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
362 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
363 return TXRX_CONTINUE
;
365 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
366 struct ieee80211_tx_packet_data
*pkt_data
;
367 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
368 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS buffer (entries "
370 MAC_ARG(sta
->addr
), sta
->aid
,
371 skb_queue_len(&sta
->ps_tx_buf
));
372 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
373 sta
->flags
|= WLAN_STA_TIM
;
374 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
375 purge_old_ps_buffers(tx
->local
);
376 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
377 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
378 if (net_ratelimit()) {
379 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" TX "
380 "buffer full - dropping oldest frame\n",
381 tx
->dev
->name
, MAC_ARG(sta
->addr
));
385 tx
->local
->total_ps_buffered
++;
386 /* Queue frame to be sent after STA sends an PS Poll frame */
387 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
388 if (tx
->local
->ops
->set_tim
)
389 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
392 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
394 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
395 pkt_data
->jiffies
= jiffies
;
396 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
400 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
401 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" in PS mode, but pspoll "
402 "set -> send frame\n", tx
->dev
->name
,
405 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
408 return TXRX_CONTINUE
;
412 static ieee80211_txrx_result
413 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
415 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
416 return TXRX_CONTINUE
;
418 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
419 return ieee80211_tx_h_unicast_ps_buf(tx
);
421 return ieee80211_tx_h_multicast_ps_buf(tx
);
427 static ieee80211_txrx_result
428 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
430 tx
->u
.tx
.control
->key_idx
= HW_KEY_IDX_INVALID
;
432 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
434 else if (tx
->sta
&& tx
->sta
->key
)
435 tx
->key
= tx
->sta
->key
;
436 else if (tx
->sdata
->default_key
)
437 tx
->key
= tx
->sdata
->default_key
;
438 else if (tx
->sdata
->drop_unencrypted
&&
439 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
440 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
446 tx
->key
->tx_rx_count
++;
447 if (unlikely(tx
->local
->key_tx_rx_threshold
&&
448 tx
->key
->tx_rx_count
>
449 tx
->local
->key_tx_rx_threshold
)) {
450 ieee80211_key_threshold_notify(tx
->dev
, tx
->key
,
455 return TXRX_CONTINUE
;
458 static ieee80211_txrx_result
459 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
461 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
462 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
463 struct sk_buff
**frags
, *first
, *frag
;
467 int frag_threshold
= tx
->local
->fragmentation_threshold
;
469 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
470 return TXRX_CONTINUE
;
474 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
475 payload_len
= first
->len
- hdrlen
;
476 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
477 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
479 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
483 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
484 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
485 pos
= first
->data
+ hdrlen
+ per_fragm
;
486 left
= payload_len
- per_fragm
;
487 for (i
= 0; i
< num_fragm
- 1; i
++) {
488 struct ieee80211_hdr
*fhdr
;
494 /* reserve enough extra head and tail room for possible
497 dev_alloc_skb(tx
->local
->tx_headroom
+
499 IEEE80211_ENCRYPT_HEADROOM
+
500 IEEE80211_ENCRYPT_TAILROOM
);
503 /* Make sure that all fragments use the same priority so
504 * that they end up using the same TX queue */
505 frag
->priority
= first
->priority
;
506 skb_reserve(frag
, tx
->local
->tx_headroom
+
507 IEEE80211_ENCRYPT_HEADROOM
);
508 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
509 memcpy(fhdr
, first
->data
, hdrlen
);
510 if (i
== num_fragm
- 2)
511 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
512 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
513 copylen
= left
> per_fragm
? per_fragm
: left
;
514 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
519 skb_trim(first
, hdrlen
+ per_fragm
);
521 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
522 tx
->u
.tx
.extra_frag
= frags
;
524 return TXRX_CONTINUE
;
527 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
529 for (i
= 0; i
< num_fragm
- 1; i
++)
531 dev_kfree_skb(frags
[i
]);
534 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
538 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
540 if (!(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)) {
541 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
544 tx
->u
.tx
.control
->key_idx
= tx
->key
->conf
.hw_key_idx
;
545 if (tx
->local
->hw
.flags
& IEEE80211_HW_WEP_INCLUDE_IV
) {
546 if (ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
) ==
554 static ieee80211_txrx_result
555 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
557 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
560 fc
= le16_to_cpu(hdr
->frame_control
);
562 if (!tx
->key
|| tx
->key
->conf
.alg
!= ALG_WEP
||
563 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
564 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
565 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
566 return TXRX_CONTINUE
;
568 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
569 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
570 ieee80211_tx_set_iswep(tx
);
572 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
573 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
577 if (tx
->u
.tx
.extra_frag
) {
579 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
580 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
581 I802_DEBUG_INC(tx
->local
->
582 tx_handlers_drop_wep
);
588 return TXRX_CONTINUE
;
591 static ieee80211_txrx_result
592 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
594 struct rate_control_extra extra
;
596 memset(&extra
, 0, sizeof(extra
));
597 extra
.mode
= tx
->u
.tx
.mode
;
598 extra
.mgmt_data
= tx
->sdata
&&
599 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
600 extra
.ethertype
= tx
->ethertype
;
602 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
604 if (unlikely(extra
.probe
!= NULL
)) {
605 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
606 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
607 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
608 tx
->u
.tx
.rate
= extra
.probe
;
610 tx
->u
.tx
.control
->alt_retry_rate
= -1;
614 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
615 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
616 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
617 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
619 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
621 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
622 tx
->u
.tx
.rate
= extra
.nonerp
;
623 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
624 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
626 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
627 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
629 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
631 return TXRX_CONTINUE
;
634 static ieee80211_txrx_result
635 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
637 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
638 u16 fc
= le16_to_cpu(hdr
->frame_control
);
640 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
641 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
643 if (!is_multicast_ether_addr(hdr
->addr1
)) {
644 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
645 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
646 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
647 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
648 control
->retry_limit
=
649 tx
->local
->long_retry_limit
;
651 control
->retry_limit
=
652 tx
->local
->short_retry_limit
;
655 control
->retry_limit
= 1;
658 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
659 /* Do not use multiple retry rates when sending fragmented
661 * TODO: The last fragment could still use multiple retry
663 control
->alt_retry_rate
= -1;
666 /* Use CTS protection for unicast frames sent using extended rates if
667 * there are associated non-ERP stations and RTS/CTS is not configured
669 if (mode
->mode
== MODE_IEEE80211G
&&
670 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
671 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
672 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
673 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
674 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
676 /* Transmit data frames using short preambles if the driver supports
677 * short preambles at the selected rate and short preambles are
678 * available on the network at the current point in time. */
679 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
680 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
681 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
682 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
683 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
686 /* Setup duration field for the first fragment of the frame. Duration
687 * for remaining fragments will be updated when they are being sent
688 * to low-level driver in ieee80211_tx(). */
689 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
690 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
691 tx
->u
.tx
.extra_frag
[0]->len
: 0);
692 hdr
->duration_id
= cpu_to_le16(dur
);
694 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
695 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
696 struct ieee80211_rate
*rate
;
698 /* Do not use multiple retry rates when using RTS/CTS */
699 control
->alt_retry_rate
= -1;
701 /* Use min(data rate, max base rate) as CTS/RTS rate */
702 rate
= tx
->u
.tx
.rate
;
703 while (rate
> mode
->rates
&&
704 !(rate
->flags
& IEEE80211_RATE_BASIC
))
707 control
->rts_cts_rate
= rate
->val
;
708 control
->rts_rate
= rate
;
712 tx
->sta
->tx_packets
++;
713 tx
->sta
->tx_fragments
++;
714 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
715 if (tx
->u
.tx
.extra_frag
) {
717 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
718 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
720 tx
->u
.tx
.extra_frag
[i
]->len
;
725 return TXRX_CONTINUE
;
728 static ieee80211_txrx_result
729 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
731 struct ieee80211_local
*local
= tx
->local
;
732 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
733 struct sk_buff
*skb
= tx
->skb
;
734 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
735 u32 load
= 0, hdrtime
;
737 /* TODO: this could be part of tx_status handling, so that the number
738 * of retries would be known; TX rate should in that case be stored
739 * somewhere with the packet */
741 /* Estimate total channel use caused by this frame */
743 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
744 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
746 if (mode
->mode
== MODE_IEEE80211A
||
747 mode
->mode
== MODE_ATHEROS_TURBO
||
748 mode
->mode
== MODE_ATHEROS_TURBOG
||
749 (mode
->mode
== MODE_IEEE80211G
&&
750 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
751 hdrtime
= CHAN_UTIL_HDR_SHORT
;
753 hdrtime
= CHAN_UTIL_HDR_LONG
;
756 if (!is_multicast_ether_addr(hdr
->addr1
))
759 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
761 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
764 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
766 if (tx
->u
.tx
.extra_frag
) {
768 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
770 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
775 /* Divide channel_use by 8 to avoid wrapping around the counter */
776 load
>>= CHAN_UTIL_SHIFT
;
777 local
->channel_use_raw
+= load
;
779 tx
->sta
->channel_use_raw
+= load
;
780 tx
->sdata
->channel_use_raw
+= load
;
782 return TXRX_CONTINUE
;
785 /* TODO: implement register/unregister functions for adding TX/RX handlers
786 * into ordered list */
788 ieee80211_tx_handler ieee80211_tx_handlers
[] =
790 ieee80211_tx_h_check_assoc
,
791 ieee80211_tx_h_sequence
,
792 ieee80211_tx_h_ps_buf
,
793 ieee80211_tx_h_select_key
,
794 ieee80211_tx_h_michael_mic_add
,
795 ieee80211_tx_h_fragment
,
796 ieee80211_tx_h_tkip_encrypt
,
797 ieee80211_tx_h_ccmp_encrypt
,
798 ieee80211_tx_h_wep_encrypt
,
799 ieee80211_tx_h_rate_ctrl
,
801 ieee80211_tx_h_load_stats
,
805 /* actual transmit path */
808 * deal with packet injection down monitor interface
809 * with Radiotap Header -- only called for monitor mode interface
811 static ieee80211_txrx_result
812 __ieee80211_parse_tx_radiotap(
813 struct ieee80211_txrx_data
*tx
,
814 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
817 * this is the moment to interpret and discard the radiotap header that
818 * must be at the start of the packet injected in Monitor mode
820 * Need to take some care with endian-ness since radiotap
821 * args are little-endian
824 struct ieee80211_radiotap_iterator iterator
;
825 struct ieee80211_radiotap_header
*rthdr
=
826 (struct ieee80211_radiotap_header
*) skb
->data
;
827 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
828 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
831 * default control situation for all injected packets
832 * FIXME: this does not suit all usage cases, expand to allow control
835 control
->retry_limit
= 1; /* no retry */
836 control
->key_idx
= HW_KEY_IDX_INVALID
;
837 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
838 IEEE80211_TXCTL_USE_CTS_PROTECT
);
839 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
840 IEEE80211_TXCTL_NO_ACK
;
841 control
->antenna_sel_tx
= 0; /* default to default antenna */
844 * for every radiotap entry that is present
845 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
846 * entries present, or -EINVAL on error)
852 ret
= ieee80211_radiotap_iterator_next(&iterator
);
857 /* see if this argument is something we can use */
858 switch (iterator
.this_arg_index
) {
860 * You must take care when dereferencing iterator.this_arg
861 * for multibyte types... the pointer is not aligned. Use
862 * get_unaligned((type *)iterator.this_arg) to dereference
863 * iterator.this_arg for type "type" safely on all arches.
865 case IEEE80211_RADIOTAP_RATE
:
867 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
868 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
870 target_rate
= (*iterator
.this_arg
) * 5;
871 for (i
= 0; i
< mode
->num_rates
; i
++) {
872 struct ieee80211_rate
*r
= &mode
->rates
[i
];
874 if (r
->rate
> target_rate
)
879 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
880 control
->tx_rate
= r
->val2
;
882 control
->tx_rate
= r
->val
;
884 /* end on exact match */
885 if (r
->rate
== target_rate
)
890 case IEEE80211_RADIOTAP_ANTENNA
:
892 * radiotap uses 0 for 1st ant, mac80211 is 1 for
895 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
898 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
899 control
->power_level
= *iterator
.this_arg
;
902 case IEEE80211_RADIOTAP_FLAGS
:
903 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
905 * this indicates that the skb we have been
906 * handed has the 32-bit FCS CRC at the end...
907 * we should react to that by snipping it off
908 * because it will be recomputed and added
911 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
914 skb_trim(skb
, skb
->len
- FCS_LEN
);
923 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
927 * remove the radiotap header
928 * iterator->max_length was sanity-checked against
929 * skb->len by iterator init
931 skb_pull(skb
, iterator
.max_length
);
933 return TXRX_CONTINUE
;
936 static ieee80211_txrx_result
inline
937 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
939 struct net_device
*dev
,
940 struct ieee80211_tx_control
*control
)
942 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
943 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
944 struct ieee80211_sub_if_data
*sdata
;
945 ieee80211_txrx_result res
= TXRX_CONTINUE
;
949 memset(tx
, 0, sizeof(*tx
));
951 tx
->dev
= dev
; /* use original interface */
953 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
954 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
955 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
958 * set defaults for things that can be set by
959 * injected radiotap headers
961 control
->power_level
= local
->hw
.conf
.power_level
;
962 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
964 /* process and remove the injection radiotap header */
965 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
966 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
967 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
972 * we removed the radiotap header after this point,
973 * we filled control with what we could use
974 * set to the actual ieee header now
976 hdr
= (struct ieee80211_hdr
*) skb
->data
;
977 res
= TXRX_QUEUED
; /* indication it was monitor packet */
980 tx
->u
.tx
.control
= control
;
981 if (is_multicast_ether_addr(hdr
->addr1
)) {
982 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
983 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
985 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
986 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
988 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
989 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
990 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
991 !local
->ops
->set_frag_threshold
)
992 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
994 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
996 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
997 else if (tx
->sta
->clear_dst_mask
) {
998 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
999 tx
->sta
->clear_dst_mask
= 0;
1001 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1002 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1003 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1004 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1006 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1011 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1012 * finished with it. */
1013 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1014 struct sk_buff
*skb
,
1015 struct net_device
*mdev
,
1016 struct ieee80211_tx_control
*control
)
1018 struct ieee80211_tx_packet_data
*pkt_data
;
1019 struct net_device
*dev
;
1021 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1022 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1023 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1029 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1033 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1034 struct ieee80211_txrx_data
*tx
)
1036 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1039 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1040 __ieee80211_queue_stopped(local
, 0)) {
1041 netif_stop_queue(local
->mdev
);
1042 return IEEE80211_TX_AGAIN
;
1045 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1046 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1048 return IEEE80211_TX_AGAIN
;
1049 local
->mdev
->trans_start
= jiffies
;
1050 ieee80211_led_tx(local
, 1);
1052 if (tx
->u
.tx
.extra_frag
) {
1053 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1054 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1055 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1056 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1057 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1058 if (!tx
->u
.tx
.extra_frag
[i
])
1060 if (__ieee80211_queue_stopped(local
, control
->queue
))
1061 return IEEE80211_TX_FRAG_AGAIN
;
1062 if (i
== tx
->u
.tx
.num_extra_frag
) {
1063 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1064 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1065 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1067 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1070 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1073 ieee80211_dump_frame(local
->mdev
->name
,
1074 "TX to low-level driver",
1075 tx
->u
.tx
.extra_frag
[i
]);
1076 ret
= local
->ops
->tx(local_to_hw(local
),
1077 tx
->u
.tx
.extra_frag
[i
],
1080 return IEEE80211_TX_FRAG_AGAIN
;
1081 local
->mdev
->trans_start
= jiffies
;
1082 ieee80211_led_tx(local
, 1);
1083 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1085 kfree(tx
->u
.tx
.extra_frag
);
1086 tx
->u
.tx
.extra_frag
= NULL
;
1088 return IEEE80211_TX_OK
;
1091 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1092 struct ieee80211_tx_control
*control
, int mgmt
)
1094 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1095 struct sta_info
*sta
;
1096 ieee80211_tx_handler
*handler
;
1097 struct ieee80211_txrx_data tx
;
1098 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1101 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1103 if (unlikely(skb
->len
< 10)) {
1108 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1110 if (res_prepare
== TXRX_DROP
) {
1116 tx
.u
.tx
.mgmt_interface
= mgmt
;
1117 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1119 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1120 res
= TXRX_CONTINUE
;
1122 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1124 res
= (*handler
)(&tx
);
1125 if (res
!= TXRX_CONTINUE
)
1130 skb
= tx
.skb
; /* handlers are allowed to change skb */
1135 if (unlikely(res
== TXRX_DROP
)) {
1136 I802_DEBUG_INC(local
->tx_handlers_drop
);
1140 if (unlikely(res
== TXRX_QUEUED
)) {
1141 I802_DEBUG_INC(local
->tx_handlers_queued
);
1145 if (tx
.u
.tx
.extra_frag
) {
1146 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1148 struct ieee80211_hdr
*hdr
=
1149 (struct ieee80211_hdr
*)
1150 tx
.u
.tx
.extra_frag
[i
]->data
;
1152 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1153 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1156 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1157 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1159 dur
= ieee80211_duration(&tx
, 0, next_len
);
1160 hdr
->duration_id
= cpu_to_le16(dur
);
1165 ret
= __ieee80211_tx(local
, skb
, &tx
);
1167 struct ieee80211_tx_stored_packet
*store
=
1168 &local
->pending_packet
[control
->queue
];
1170 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1172 set_bit(IEEE80211_LINK_STATE_PENDING
,
1173 &local
->state
[control
->queue
]);
1175 /* When the driver gets out of buffers during sending of
1176 * fragments and calls ieee80211_stop_queue, there is
1177 * a small window between IEEE80211_LINK_STATE_XOFF and
1178 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1179 * gets available in that window (i.e. driver calls
1180 * ieee80211_wake_queue), we would end up with ieee80211_tx
1181 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1182 * continuing transmitting here when that situation is
1183 * possible to have happened. */
1184 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1185 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1186 &local
->state
[control
->queue
]);
1189 memcpy(&store
->control
, control
,
1190 sizeof(struct ieee80211_tx_control
));
1192 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1193 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1194 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1195 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1196 store
->last_frag_rate_ctrl_probe
=
1197 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1204 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1205 if (tx
.u
.tx
.extra_frag
[i
])
1206 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1207 kfree(tx
.u
.tx
.extra_frag
);
1211 /* device xmit handlers */
1213 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1214 struct net_device
*dev
)
1216 struct ieee80211_tx_control control
;
1217 struct ieee80211_tx_packet_data
*pkt_data
;
1218 struct net_device
*odev
= NULL
;
1219 struct ieee80211_sub_if_data
*osdata
;
1224 * copy control out of the skb so other people can use skb->cb
1226 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1227 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1229 if (pkt_data
->ifindex
)
1230 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1231 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1235 if (unlikely(!odev
)) {
1236 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1237 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1238 "originating device\n", dev
->name
);
1243 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1245 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1246 if (skb_headroom(skb
) < headroom
) {
1247 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1254 control
.ifindex
= odev
->ifindex
;
1255 control
.type
= osdata
->type
;
1256 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1257 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1258 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1259 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1260 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1261 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1262 control
.queue
= pkt_data
->queue
;
1264 ret
= ieee80211_tx(odev
, skb
, &control
,
1265 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1271 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1272 struct net_device
*dev
)
1274 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1275 struct ieee80211_tx_packet_data
*pkt_data
;
1276 struct ieee80211_radiotap_header
*prthdr
=
1277 (struct ieee80211_radiotap_header
*)skb
->data
;
1280 /* check for not even having the fixed radiotap header part */
1281 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1282 goto fail
; /* too short to be possibly valid */
1284 /* is it a header version we can trust to find length from? */
1285 if (unlikely(prthdr
->it_version
))
1286 goto fail
; /* only version 0 is supported */
1288 /* then there must be a radiotap header with a length we can use */
1289 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1291 /* does the skb contain enough to deliver on the alleged length? */
1292 if (unlikely(skb
->len
< len_rthdr
))
1293 goto fail
; /* skb too short for claimed rt header extent */
1295 skb
->dev
= local
->mdev
;
1297 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1298 memset(pkt_data
, 0, sizeof(*pkt_data
));
1299 /* needed because we set skb device to master */
1300 pkt_data
->ifindex
= dev
->ifindex
;
1302 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1305 * fix up the pointers accounting for the radiotap
1306 * header still being in there. We are being given
1307 * a precooked IEEE80211 header so no need for
1310 skb_set_mac_header(skb
, len_rthdr
);
1312 * these are just fixed to the end of the rt area since we
1313 * don't have any better information and at this point, nobody cares
1315 skb_set_network_header(skb
, len_rthdr
);
1316 skb_set_transport_header(skb
, len_rthdr
);
1318 /* pass the radiotap header up to the next stage intact */
1319 dev_queue_xmit(skb
);
1320 return NETDEV_TX_OK
;
1324 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1328 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1329 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1330 * @skb: packet to be sent
1331 * @dev: incoming interface
1333 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1334 * not be freed, and caller is responsible for either retrying later or freeing
1337 * This function takes in an Ethernet header and encapsulates it with suitable
1338 * IEEE 802.11 header based on which interface the packet is coming in. The
1339 * encapsulated packet will then be passed to master interface, wlan#.11, for
1340 * transmission (through low-level driver).
1342 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1343 struct net_device
*dev
)
1345 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1346 struct ieee80211_tx_packet_data
*pkt_data
;
1347 struct ieee80211_sub_if_data
*sdata
;
1348 int ret
= 1, head_need
;
1349 u16 ethertype
, hdrlen
, fc
;
1350 struct ieee80211_hdr hdr
;
1351 const u8
*encaps_data
;
1352 int encaps_len
, skip_header_bytes
;
1354 struct sta_info
*sta
;
1356 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1357 if (unlikely(skb
->len
< ETH_HLEN
)) {
1358 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1359 dev
->name
, skb
->len
);
1364 nh_pos
= skb_network_header(skb
) - skb
->data
;
1365 h_pos
= skb_transport_header(skb
) - skb
->data
;
1367 /* convert Ethernet header to proper 802.11 header (based on
1368 * operation mode) */
1369 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1370 /* TODO: handling for 802.1x authorized/unauthorized port */
1371 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1373 switch (sdata
->type
) {
1374 case IEEE80211_IF_TYPE_AP
:
1375 case IEEE80211_IF_TYPE_VLAN
:
1376 fc
|= IEEE80211_FCTL_FROMDS
;
1378 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1379 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1380 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1383 case IEEE80211_IF_TYPE_WDS
:
1384 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1386 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1387 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1388 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1389 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1392 case IEEE80211_IF_TYPE_STA
:
1393 fc
|= IEEE80211_FCTL_TODS
;
1395 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1396 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1397 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1400 case IEEE80211_IF_TYPE_IBSS
:
1402 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1403 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1404 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1412 /* receiver is QoS enabled, use a QoS type frame */
1413 sta
= sta_info_get(local
, hdr
.addr1
);
1415 if (sta
->flags
& WLAN_STA_WME
) {
1416 fc
|= IEEE80211_STYPE_QOS_DATA
;
1422 hdr
.frame_control
= cpu_to_le16(fc
);
1423 hdr
.duration_id
= 0;
1426 skip_header_bytes
= ETH_HLEN
;
1427 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1428 encaps_data
= bridge_tunnel_header
;
1429 encaps_len
= sizeof(bridge_tunnel_header
);
1430 skip_header_bytes
-= 2;
1431 } else if (ethertype
>= 0x600) {
1432 encaps_data
= rfc1042_header
;
1433 encaps_len
= sizeof(rfc1042_header
);
1434 skip_header_bytes
-= 2;
1440 skb_pull(skb
, skip_header_bytes
);
1441 nh_pos
-= skip_header_bytes
;
1442 h_pos
-= skip_header_bytes
;
1444 /* TODO: implement support for fragments so that there is no need to
1445 * reallocate and copy payload; it might be enough to support one
1446 * extra fragment that would be copied in the beginning of the frame
1447 * data.. anyway, it would be nice to include this into skb structure
1450 * There are few options for this:
1451 * use skb->cb as an extra space for 802.11 header
1452 * allocate new buffer if not enough headroom
1453 * make sure that there is enough headroom in every skb by increasing
1454 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1455 * alloc_skb() (net/core/skbuff.c)
1457 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1458 head_need
-= skb_headroom(skb
);
1460 /* We are going to modify skb data, so make a copy of it if happens to
1461 * be cloned. This could happen, e.g., with Linux bridge code passing
1462 * us broadcast frames. */
1464 if (head_need
> 0 || skb_cloned(skb
)) {
1466 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1467 "of headroom\n", dev
->name
, head_need
);
1470 if (skb_cloned(skb
))
1471 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1473 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1474 /* Since we have to reallocate the buffer, make sure that there
1475 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1476 * before payload and 12 after). */
1477 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1479 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1486 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1487 nh_pos
+= encaps_len
;
1488 h_pos
+= encaps_len
;
1490 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1494 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1495 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1496 pkt_data
->ifindex
= dev
->ifindex
;
1497 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1498 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1500 skb
->dev
= local
->mdev
;
1501 sdata
->stats
.tx_packets
++;
1502 sdata
->stats
.tx_bytes
+= skb
->len
;
1504 /* Update skb pointers to various headers since this modified frame
1505 * is going to go through Linux networking code that may potentially
1506 * need things like pointer to IP header. */
1507 skb_set_mac_header(skb
, 0);
1508 skb_set_network_header(skb
, nh_pos
);
1509 skb_set_transport_header(skb
, h_pos
);
1511 dev
->trans_start
= jiffies
;
1512 dev_queue_xmit(skb
);
1524 * This is the transmit routine for the 802.11 type interfaces
1525 * called by upper layers of the linux networking
1526 * stack when it has a frame to transmit
1528 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1530 struct ieee80211_sub_if_data
*sdata
;
1531 struct ieee80211_tx_packet_data
*pkt_data
;
1532 struct ieee80211_hdr
*hdr
;
1535 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1537 if (skb
->len
< 10) {
1542 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1543 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1550 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1551 fc
= le16_to_cpu(hdr
->frame_control
);
1553 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1554 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1555 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1556 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1557 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1559 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1560 skb
->dev
= sdata
->local
->mdev
;
1563 * We're using the protocol field of the the frame control header
1564 * to request TX callback for hostapd. BIT(1) is checked.
1566 if ((fc
& BIT(1)) == BIT(1)) {
1567 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1569 hdr
->frame_control
= cpu_to_le16(fc
);
1572 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1573 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1575 sdata
->stats
.tx_packets
++;
1576 sdata
->stats
.tx_bytes
+= skb
->len
;
1578 dev_queue_xmit(skb
);
1583 /* helper functions for pending packets for when queues are stopped */
1585 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1588 struct ieee80211_tx_stored_packet
*store
;
1590 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1591 if (!__ieee80211_queue_pending(local
, i
))
1593 store
= &local
->pending_packet
[i
];
1594 kfree_skb(store
->skb
);
1595 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1596 kfree_skb(store
->extra_frag
[j
]);
1597 kfree(store
->extra_frag
);
1598 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1602 void ieee80211_tx_pending(unsigned long data
)
1604 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1605 struct net_device
*dev
= local
->mdev
;
1606 struct ieee80211_tx_stored_packet
*store
;
1607 struct ieee80211_txrx_data tx
;
1608 int i
, ret
, reschedule
= 0;
1610 netif_tx_lock_bh(dev
);
1611 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1612 if (__ieee80211_queue_stopped(local
, i
))
1614 if (!__ieee80211_queue_pending(local
, i
)) {
1618 store
= &local
->pending_packet
[i
];
1619 tx
.u
.tx
.control
= &store
->control
;
1620 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1621 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1622 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1623 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1625 if (store
->last_frag_rate_ctrl_probe
)
1626 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1627 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1629 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1632 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1637 netif_tx_unlock_bh(dev
);
1639 if (!ieee80211_qdisc_installed(dev
)) {
1640 if (!__ieee80211_queue_stopped(local
, 0))
1641 netif_wake_queue(dev
);
1643 netif_schedule(dev
);
1647 /* functions for drivers to get certain frames */
1649 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1650 struct ieee80211_if_ap
*bss
,
1651 struct sk_buff
*skb
)
1655 int i
, have_bits
= 0, n1
, n2
;
1657 /* Generate bitmap for TIM only if there are any STAs in power save
1659 read_lock_bh(&local
->sta_lock
);
1660 if (atomic_read(&bss
->num_sta_ps
) > 0)
1661 /* in the hope that this is faster than
1662 * checking byte-for-byte */
1663 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1664 IEEE80211_MAX_AID
+1);
1666 if (bss
->dtim_count
== 0)
1667 bss
->dtim_count
= bss
->dtim_period
- 1;
1671 tim
= pos
= (u8
*) skb_put(skb
, 6);
1672 *pos
++ = WLAN_EID_TIM
;
1674 *pos
++ = bss
->dtim_count
;
1675 *pos
++ = bss
->dtim_period
;
1677 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1681 /* Find largest even number N1 so that bits numbered 1 through
1682 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1683 * (N2 + 1) x 8 through 2007 are 0. */
1685 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1692 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1699 /* Bitmap control */
1701 /* Part Virt Bitmap */
1702 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1704 tim
[1] = n2
- n1
+ 4;
1705 skb_put(skb
, n2
- n1
);
1707 *pos
++ = aid0
; /* Bitmap control */
1708 *pos
++ = 0; /* Part Virt Bitmap */
1710 read_unlock_bh(&local
->sta_lock
);
1713 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1714 struct ieee80211_tx_control
*control
)
1716 struct ieee80211_local
*local
= hw_to_local(hw
);
1717 struct sk_buff
*skb
;
1718 struct net_device
*bdev
;
1719 struct ieee80211_sub_if_data
*sdata
= NULL
;
1720 struct ieee80211_if_ap
*ap
= NULL
;
1721 struct ieee80211_rate
*rate
;
1722 struct rate_control_extra extra
;
1723 u8
*b_head
, *b_tail
;
1726 bdev
= dev_get_by_index(&init_net
, if_id
);
1728 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1733 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1735 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1736 if (net_ratelimit())
1737 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1738 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1739 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1743 /* Assume we are generating the normal beacon locally */
1744 b_head
= ap
->beacon_head
;
1745 b_tail
= ap
->beacon_tail
;
1746 bh_len
= ap
->beacon_head_len
;
1747 bt_len
= ap
->beacon_tail_len
;
1749 skb
= dev_alloc_skb(local
->tx_headroom
+
1750 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1754 skb_reserve(skb
, local
->tx_headroom
);
1755 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1757 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1759 ieee80211_beacon_add_tim(local
, ap
, skb
);
1762 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1766 memset(&extra
, 0, sizeof(extra
));
1767 extra
.mode
= local
->oper_hw_mode
;
1769 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1771 if (net_ratelimit()) {
1772 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1773 "found\n", local
->mdev
->name
);
1780 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1781 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1782 rate
->val2
: rate
->val
;
1783 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1784 control
->power_level
= local
->hw
.conf
.power_level
;
1785 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1786 control
->retry_limit
= 1;
1787 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1793 EXPORT_SYMBOL(ieee80211_beacon_get
);
1795 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1796 const void *frame
, size_t frame_len
,
1797 const struct ieee80211_tx_control
*frame_txctl
,
1798 struct ieee80211_rts
*rts
)
1800 const struct ieee80211_hdr
*hdr
= frame
;
1803 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1804 rts
->frame_control
= cpu_to_le16(fctl
);
1805 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1806 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1807 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1809 EXPORT_SYMBOL(ieee80211_rts_get
);
1811 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1812 const void *frame
, size_t frame_len
,
1813 const struct ieee80211_tx_control
*frame_txctl
,
1814 struct ieee80211_cts
*cts
)
1816 const struct ieee80211_hdr
*hdr
= frame
;
1819 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1820 cts
->frame_control
= cpu_to_le16(fctl
);
1821 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1822 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1824 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1827 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1828 struct ieee80211_tx_control
*control
)
1830 struct ieee80211_local
*local
= hw_to_local(hw
);
1831 struct sk_buff
*skb
;
1832 struct sta_info
*sta
;
1833 ieee80211_tx_handler
*handler
;
1834 struct ieee80211_txrx_data tx
;
1835 ieee80211_txrx_result res
= TXRX_DROP
;
1836 struct net_device
*bdev
;
1837 struct ieee80211_sub_if_data
*sdata
;
1838 struct ieee80211_if_ap
*bss
= NULL
;
1840 bdev
= dev_get_by_index(&init_net
, if_id
);
1842 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1846 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1849 if (bss
->dtim_count
!= 0)
1850 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1851 memset(control
, 0, sizeof(*control
));
1853 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1856 local
->total_ps_buffered
--;
1858 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1859 struct ieee80211_hdr
*hdr
=
1860 (struct ieee80211_hdr
*) skb
->data
;
1861 /* more buffered multicast/broadcast frames ==> set
1862 * MoreData flag in IEEE 802.11 header to inform PS
1864 hdr
->frame_control
|=
1865 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1868 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1870 dev_kfree_skb_any(skb
);
1873 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1875 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1876 res
= (*handler
)(&tx
);
1877 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1881 skb
= tx
.skb
; /* handlers are allowed to change skb */
1883 if (res
== TXRX_DROP
) {
1884 I802_DEBUG_INC(local
->tx_handlers_drop
);
1887 } else if (res
== TXRX_QUEUED
) {
1888 I802_DEBUG_INC(local
->tx_handlers_queued
);
1897 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);