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/ieee80211_radiotap.h>
21 #include <net/cfg80211.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "ieee80211_led.h"
30 #include "ieee80211_rate.h"
32 #define IEEE80211_TX_OK 0
33 #define IEEE80211_TX_AGAIN 1
34 #define IEEE80211_TX_FRAG_AGAIN 2
38 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
39 struct ieee80211_hdr
*hdr
)
41 /* Set the sequence number for this frame. */
42 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
44 /* Increase the sequence number. */
45 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
48 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
50 const struct sk_buff
*skb
)
52 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
56 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
62 fc
= le16_to_cpu(hdr
->frame_control
);
63 hdrlen
= ieee80211_get_hdrlen(fc
);
64 if (hdrlen
> skb
->len
)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc
, le16_to_cpu(hdr
->duration_id
));
70 printk(" A1=" MAC_FMT
, MAC_ARG(hdr
->addr1
));
72 printk(" A2=" MAC_FMT
, MAC_ARG(hdr
->addr2
));
74 printk(" A3=" MAC_FMT
, MAC_ARG(hdr
->addr3
));
76 printk(" A4=" MAC_FMT
, MAC_ARG(hdr
->addr4
));
79 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
84 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
89 int rate
, mrate
, erp
, dur
, i
;
90 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
91 struct ieee80211_local
*local
= tx
->local
;
92 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
94 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
97 * data and mgmt (except PS Poll):
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
114 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
127 * PS Poll: BIT(15) | BIT(14) | aid
133 if (0 /* FIX: data/mgmt during CFP */)
136 if (group_addr
) /* Group address as the destination - no ACK */
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 mrate
= 10; /* use 1 Mbps if everything fails */
151 for (i
= 0; i
< mode
->num_rates
; i
++) {
152 struct ieee80211_rate
*r
= &mode
->rates
[i
];
153 if (r
->rate
> txrate
->rate
)
156 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
157 IEEE80211_RATE_MODULATION(r
->flags
))
160 if (r
->flags
& IEEE80211_RATE_BASIC
)
162 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
166 /* No matching basic rate found; use highest suitable mandatory
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
175 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
176 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur
*= 2; /* ACK + SIFS */
183 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
186 IEEE80211_SDATA_SHORT_PREAMBLE
);
192 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
195 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
198 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
201 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
204 static int inline is_ieee80211_device(struct net_device
*dev
,
205 struct net_device
*master
)
207 return (wdev_priv(dev
->ieee80211_ptr
) ==
208 wdev_priv(master
->ieee80211_ptr
));
213 static ieee80211_txrx_result
214 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
216 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
217 struct sk_buff
*skb
= tx
->skb
;
218 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
219 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
222 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
223 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
224 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
227 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
228 return TXRX_CONTINUE
;
230 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
232 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
233 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
234 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
235 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
236 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
237 printk(KERN_DEBUG
"%s: dropped data frame to not "
238 "associated station " MAC_FMT
"\n",
239 tx
->dev
->name
, MAC_ARG(hdr
->addr1
));
240 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
241 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
245 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
246 tx
->local
->num_sta
== 0 &&
247 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
249 * No associated STAs - no need to send multicast
254 return TXRX_CONTINUE
;
257 if (unlikely(!tx
->u
.tx
.mgmt_interface
&& tx
->sdata
->ieee802_1x
&&
258 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
259 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
260 printk(KERN_DEBUG
"%s: dropped frame to " MAC_FMT
261 " (unauthorized port)\n", tx
->dev
->name
,
262 MAC_ARG(hdr
->addr1
));
264 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
268 return TXRX_CONTINUE
;
271 static ieee80211_txrx_result
272 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
274 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
276 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
277 ieee80211_include_sequence(tx
->sdata
, hdr
);
279 return TXRX_CONTINUE
;
282 /* This function is called whenever the AP is about to exceed the maximum limit
283 * of buffered frames for power saving STAs. This situation should not really
284 * happen often during normal operation, so dropping the oldest buffered packet
285 * from each queue should be OK to make some room for new frames. */
286 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
288 int total
= 0, purged
= 0;
290 struct ieee80211_sub_if_data
*sdata
;
291 struct sta_info
*sta
;
293 read_lock(&local
->sub_if_lock
);
294 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
295 struct ieee80211_if_ap
*ap
;
296 if (sdata
->dev
== local
->mdev
||
297 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
300 skb
= skb_dequeue(&ap
->ps_bc_buf
);
305 total
+= skb_queue_len(&ap
->ps_bc_buf
);
307 read_unlock(&local
->sub_if_lock
);
309 read_lock_bh(&local
->sta_lock
);
310 list_for_each_entry(sta
, &local
->sta_list
, list
) {
311 skb
= skb_dequeue(&sta
->ps_tx_buf
);
316 total
+= skb_queue_len(&sta
->ps_tx_buf
);
318 read_unlock_bh(&local
->sta_lock
);
320 local
->total_ps_buffered
= total
;
321 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
322 local
->mdev
->name
, purged
);
325 static inline ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
332 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
333 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
334 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
335 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
336 purge_old_ps_buffers(tx
->local
);
337 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG
"%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
344 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
346 tx
->local
->total_ps_buffered
++;
347 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
351 return TXRX_CONTINUE
;
354 static inline ieee80211_txrx_result
355 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
357 struct sta_info
*sta
= tx
->sta
;
360 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
361 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
362 return TXRX_CONTINUE
;
364 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
365 struct ieee80211_tx_packet_data
*pkt_data
;
366 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
367 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS buffer (entries "
369 MAC_ARG(sta
->addr
), sta
->aid
,
370 skb_queue_len(&sta
->ps_tx_buf
));
371 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
372 sta
->flags
|= WLAN_STA_TIM
;
373 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
374 purge_old_ps_buffers(tx
->local
);
375 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
376 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" TX "
379 "buffer full - dropping oldest frame\n",
380 tx
->dev
->name
, MAC_ARG(sta
->addr
));
384 tx
->local
->total_ps_buffered
++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
387 if (tx
->local
->ops
->set_tim
)
388 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
391 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
393 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
394 pkt_data
->jiffies
= jiffies
;
395 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
398 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
400 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" in PS mode, but pspoll "
401 "set -> send frame\n", tx
->dev
->name
,
404 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 return TXRX_CONTINUE
;
411 static ieee80211_txrx_result
412 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
414 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
415 return TXRX_CONTINUE
;
417 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
418 return ieee80211_tx_h_unicast_ps_buf(tx
);
420 return ieee80211_tx_h_multicast_ps_buf(tx
);
426 static ieee80211_txrx_result
427 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
429 tx
->u
.tx
.control
->key_idx
= HW_KEY_IDX_INVALID
;
431 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
433 else if (tx
->sta
&& tx
->sta
->key
)
434 tx
->key
= tx
->sta
->key
;
435 else if (tx
->sdata
->default_key
)
436 tx
->key
= tx
->sdata
->default_key
;
437 else if (tx
->sdata
->drop_unencrypted
&&
438 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
439 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
445 tx
->key
->tx_rx_count
++;
446 if (unlikely(tx
->local
->key_tx_rx_threshold
&&
447 tx
->key
->tx_rx_count
>
448 tx
->local
->key_tx_rx_threshold
)) {
449 ieee80211_key_threshold_notify(tx
->dev
, tx
->key
,
454 return TXRX_CONTINUE
;
457 static ieee80211_txrx_result
458 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
460 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
461 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
462 struct sk_buff
**frags
, *first
, *frag
;
466 int frag_threshold
= tx
->local
->fragmentation_threshold
;
468 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
469 return TXRX_CONTINUE
;
473 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
474 payload_len
= first
->len
- hdrlen
;
475 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
476 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
478 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
482 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
483 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
484 pos
= first
->data
+ hdrlen
+ per_fragm
;
485 left
= payload_len
- per_fragm
;
486 for (i
= 0; i
< num_fragm
- 1; i
++) {
487 struct ieee80211_hdr
*fhdr
;
493 /* reserve enough extra head and tail room for possible
496 dev_alloc_skb(tx
->local
->tx_headroom
+
498 IEEE80211_ENCRYPT_HEADROOM
+
499 IEEE80211_ENCRYPT_TAILROOM
);
502 /* Make sure that all fragments use the same priority so
503 * that they end up using the same TX queue */
504 frag
->priority
= first
->priority
;
505 skb_reserve(frag
, tx
->local
->tx_headroom
+
506 IEEE80211_ENCRYPT_HEADROOM
);
507 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
508 memcpy(fhdr
, first
->data
, hdrlen
);
509 if (i
== num_fragm
- 2)
510 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
511 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
512 copylen
= left
> per_fragm
? per_fragm
: left
;
513 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
518 skb_trim(first
, hdrlen
+ per_fragm
);
520 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
521 tx
->u
.tx
.extra_frag
= frags
;
523 return TXRX_CONTINUE
;
526 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
528 for (i
= 0; i
< num_fragm
- 1; i
++)
530 dev_kfree_skb(frags
[i
]);
533 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
537 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
539 if (!(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)) {
540 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
543 tx
->u
.tx
.control
->key_idx
= tx
->key
->conf
.hw_key_idx
;
544 if (tx
->local
->hw
.flags
& IEEE80211_HW_WEP_INCLUDE_IV
) {
545 if (ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
) ==
553 static ieee80211_txrx_result
554 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
556 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
559 fc
= le16_to_cpu(hdr
->frame_control
);
561 if (!tx
->key
|| tx
->key
->conf
.alg
!= ALG_WEP
||
562 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
563 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
564 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
565 return TXRX_CONTINUE
;
567 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
568 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
569 ieee80211_tx_set_iswep(tx
);
571 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
572 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
576 if (tx
->u
.tx
.extra_frag
) {
578 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
579 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
580 I802_DEBUG_INC(tx
->local
->
581 tx_handlers_drop_wep
);
587 return TXRX_CONTINUE
;
590 static ieee80211_txrx_result
591 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
593 struct rate_control_extra extra
;
595 memset(&extra
, 0, sizeof(extra
));
596 extra
.mode
= tx
->u
.tx
.mode
;
597 extra
.mgmt_data
= tx
->sdata
&&
598 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
599 extra
.ethertype
= tx
->ethertype
;
601 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
603 if (unlikely(extra
.probe
!= NULL
)) {
604 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
605 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
606 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
607 tx
->u
.tx
.rate
= extra
.probe
;
609 tx
->u
.tx
.control
->alt_retry_rate
= -1;
613 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
614 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
615 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
616 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
618 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
620 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
621 tx
->u
.tx
.rate
= extra
.nonerp
;
622 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
623 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
625 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
626 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
628 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
630 return TXRX_CONTINUE
;
633 static ieee80211_txrx_result
634 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
636 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
637 u16 fc
= le16_to_cpu(hdr
->frame_control
);
639 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
640 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
642 if (!is_multicast_ether_addr(hdr
->addr1
)) {
643 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
644 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
645 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
646 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
647 control
->retry_limit
=
648 tx
->local
->long_retry_limit
;
650 control
->retry_limit
=
651 tx
->local
->short_retry_limit
;
654 control
->retry_limit
= 1;
657 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
658 /* Do not use multiple retry rates when sending fragmented
660 * TODO: The last fragment could still use multiple retry
662 control
->alt_retry_rate
= -1;
665 /* Use CTS protection for unicast frames sent using extended rates if
666 * there are associated non-ERP stations and RTS/CTS is not configured
668 if (mode
->mode
== MODE_IEEE80211G
&&
669 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
670 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
671 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
672 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
673 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
675 /* Transmit data frames using short preambles if the driver supports
676 * short preambles at the selected rate and short preambles are
677 * available on the network at the current point in time. */
678 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
679 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
680 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
681 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
682 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
685 /* Setup duration field for the first fragment of the frame. Duration
686 * for remaining fragments will be updated when they are being sent
687 * to low-level driver in ieee80211_tx(). */
688 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
689 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
690 tx
->u
.tx
.extra_frag
[0]->len
: 0);
691 hdr
->duration_id
= cpu_to_le16(dur
);
693 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
694 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
695 struct ieee80211_rate
*rate
;
697 /* Do not use multiple retry rates when using RTS/CTS */
698 control
->alt_retry_rate
= -1;
700 /* Use min(data rate, max base rate) as CTS/RTS rate */
701 rate
= tx
->u
.tx
.rate
;
702 while (rate
> mode
->rates
&&
703 !(rate
->flags
& IEEE80211_RATE_BASIC
))
706 control
->rts_cts_rate
= rate
->val
;
707 control
->rts_rate
= rate
;
711 tx
->sta
->tx_packets
++;
712 tx
->sta
->tx_fragments
++;
713 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
714 if (tx
->u
.tx
.extra_frag
) {
716 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
717 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
719 tx
->u
.tx
.extra_frag
[i
]->len
;
724 return TXRX_CONTINUE
;
727 static ieee80211_txrx_result
728 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
730 struct ieee80211_local
*local
= tx
->local
;
731 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
732 struct sk_buff
*skb
= tx
->skb
;
733 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
734 u32 load
= 0, hdrtime
;
736 /* TODO: this could be part of tx_status handling, so that the number
737 * of retries would be known; TX rate should in that case be stored
738 * somewhere with the packet */
740 /* Estimate total channel use caused by this frame */
742 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
743 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
745 if (mode
->mode
== MODE_IEEE80211A
||
746 mode
->mode
== MODE_ATHEROS_TURBO
||
747 mode
->mode
== MODE_ATHEROS_TURBOG
||
748 (mode
->mode
== MODE_IEEE80211G
&&
749 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
750 hdrtime
= CHAN_UTIL_HDR_SHORT
;
752 hdrtime
= CHAN_UTIL_HDR_LONG
;
755 if (!is_multicast_ether_addr(hdr
->addr1
))
758 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
760 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
763 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
765 if (tx
->u
.tx
.extra_frag
) {
767 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
769 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
774 /* Divide channel_use by 8 to avoid wrapping around the counter */
775 load
>>= CHAN_UTIL_SHIFT
;
776 local
->channel_use_raw
+= load
;
778 tx
->sta
->channel_use_raw
+= load
;
779 tx
->sdata
->channel_use_raw
+= load
;
781 return TXRX_CONTINUE
;
784 /* TODO: implement register/unregister functions for adding TX/RX handlers
785 * into ordered list */
787 ieee80211_tx_handler ieee80211_tx_handlers
[] =
789 ieee80211_tx_h_check_assoc
,
790 ieee80211_tx_h_sequence
,
791 ieee80211_tx_h_ps_buf
,
792 ieee80211_tx_h_select_key
,
793 ieee80211_tx_h_michael_mic_add
,
794 ieee80211_tx_h_fragment
,
795 ieee80211_tx_h_tkip_encrypt
,
796 ieee80211_tx_h_ccmp_encrypt
,
797 ieee80211_tx_h_wep_encrypt
,
798 ieee80211_tx_h_rate_ctrl
,
800 ieee80211_tx_h_load_stats
,
804 /* actual transmit path */
807 * deal with packet injection down monitor interface
808 * with Radiotap Header -- only called for monitor mode interface
810 static ieee80211_txrx_result
811 __ieee80211_parse_tx_radiotap(
812 struct ieee80211_txrx_data
*tx
,
813 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
816 * this is the moment to interpret and discard the radiotap header that
817 * must be at the start of the packet injected in Monitor mode
819 * Need to take some care with endian-ness since radiotap
820 * args are little-endian
823 struct ieee80211_radiotap_iterator iterator
;
824 struct ieee80211_radiotap_header
*rthdr
=
825 (struct ieee80211_radiotap_header
*) skb
->data
;
826 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
827 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
830 * default control situation for all injected packets
831 * FIXME: this does not suit all usage cases, expand to allow control
834 control
->retry_limit
= 1; /* no retry */
835 control
->key_idx
= HW_KEY_IDX_INVALID
;
836 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
837 IEEE80211_TXCTL_USE_CTS_PROTECT
);
838 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
839 IEEE80211_TXCTL_NO_ACK
;
840 control
->antenna_sel_tx
= 0; /* default to default antenna */
843 * for every radiotap entry that is present
844 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
845 * entries present, or -EINVAL on error)
851 ret
= ieee80211_radiotap_iterator_next(&iterator
);
856 /* see if this argument is something we can use */
857 switch (iterator
.this_arg_index
) {
859 * You must take care when dereferencing iterator.this_arg
860 * for multibyte types... the pointer is not aligned. Use
861 * get_unaligned((type *)iterator.this_arg) to dereference
862 * iterator.this_arg for type "type" safely on all arches.
864 case IEEE80211_RADIOTAP_RATE
:
866 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
867 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
869 target_rate
= (*iterator
.this_arg
) * 5;
870 for (i
= 0; i
< mode
->num_rates
; i
++) {
871 struct ieee80211_rate
*r
= &mode
->rates
[i
];
873 if (r
->rate
> target_rate
)
878 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
879 control
->tx_rate
= r
->val2
;
881 control
->tx_rate
= r
->val
;
883 /* end on exact match */
884 if (r
->rate
== target_rate
)
889 case IEEE80211_RADIOTAP_ANTENNA
:
891 * radiotap uses 0 for 1st ant, mac80211 is 1 for
894 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
897 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
898 control
->power_level
= *iterator
.this_arg
;
901 case IEEE80211_RADIOTAP_FLAGS
:
902 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
904 * this indicates that the skb we have been
905 * handed has the 32-bit FCS CRC at the end...
906 * we should react to that by snipping it off
907 * because it will be recomputed and added
910 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
913 skb_trim(skb
, skb
->len
- FCS_LEN
);
922 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
926 * remove the radiotap header
927 * iterator->max_length was sanity-checked against
928 * skb->len by iterator init
930 skb_pull(skb
, iterator
.max_length
);
932 return TXRX_CONTINUE
;
935 static ieee80211_txrx_result
inline
936 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
938 struct net_device
*dev
,
939 struct ieee80211_tx_control
*control
)
941 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
942 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
943 struct ieee80211_sub_if_data
*sdata
;
944 ieee80211_txrx_result res
= TXRX_CONTINUE
;
948 memset(tx
, 0, sizeof(*tx
));
950 tx
->dev
= dev
; /* use original interface */
952 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
953 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
954 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
957 * set defaults for things that can be set by
958 * injected radiotap headers
960 control
->power_level
= local
->hw
.conf
.power_level
;
961 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
963 /* process and remove the injection radiotap header */
964 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
965 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
966 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
971 * we removed the radiotap header after this point,
972 * we filled control with what we could use
973 * set to the actual ieee header now
975 hdr
= (struct ieee80211_hdr
*) skb
->data
;
976 res
= TXRX_QUEUED
; /* indication it was monitor packet */
979 tx
->u
.tx
.control
= control
;
980 if (is_multicast_ether_addr(hdr
->addr1
)) {
981 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
982 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
984 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
985 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
987 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
988 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
989 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
990 !local
->ops
->set_frag_threshold
)
991 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
993 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
995 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
996 else if (tx
->sta
->clear_dst_mask
) {
997 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
998 tx
->sta
->clear_dst_mask
= 0;
1000 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1001 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1002 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1003 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1005 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1010 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1011 * finished with it. */
1012 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1013 struct sk_buff
*skb
,
1014 struct net_device
*mdev
,
1015 struct ieee80211_tx_control
*control
)
1017 struct ieee80211_tx_packet_data
*pkt_data
;
1018 struct net_device
*dev
;
1020 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1021 dev
= dev_get_by_index(pkt_data
->ifindex
);
1022 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1028 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1032 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1033 struct ieee80211_txrx_data
*tx
)
1035 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1038 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1039 __ieee80211_queue_stopped(local
, 0)) {
1040 netif_stop_queue(local
->mdev
);
1041 return IEEE80211_TX_AGAIN
;
1044 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1045 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1047 return IEEE80211_TX_AGAIN
;
1048 local
->mdev
->trans_start
= jiffies
;
1049 ieee80211_led_tx(local
, 1);
1051 if (tx
->u
.tx
.extra_frag
) {
1052 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1053 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1054 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1055 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1056 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1057 if (!tx
->u
.tx
.extra_frag
[i
])
1059 if (__ieee80211_queue_stopped(local
, control
->queue
))
1060 return IEEE80211_TX_FRAG_AGAIN
;
1061 if (i
== tx
->u
.tx
.num_extra_frag
) {
1062 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1063 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1064 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1066 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1069 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1072 ieee80211_dump_frame(local
->mdev
->name
,
1073 "TX to low-level driver",
1074 tx
->u
.tx
.extra_frag
[i
]);
1075 ret
= local
->ops
->tx(local_to_hw(local
),
1076 tx
->u
.tx
.extra_frag
[i
],
1079 return IEEE80211_TX_FRAG_AGAIN
;
1080 local
->mdev
->trans_start
= jiffies
;
1081 ieee80211_led_tx(local
, 1);
1082 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1084 kfree(tx
->u
.tx
.extra_frag
);
1085 tx
->u
.tx
.extra_frag
= NULL
;
1087 return IEEE80211_TX_OK
;
1090 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1091 struct ieee80211_tx_control
*control
, int mgmt
)
1093 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1094 struct sta_info
*sta
;
1095 ieee80211_tx_handler
*handler
;
1096 struct ieee80211_txrx_data tx
;
1097 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1100 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1102 if (unlikely(skb
->len
< 10)) {
1107 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1109 if (res_prepare
== TXRX_DROP
) {
1115 tx
.u
.tx
.mgmt_interface
= mgmt
;
1116 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1118 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1119 res
= TXRX_CONTINUE
;
1121 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1123 res
= (*handler
)(&tx
);
1124 if (res
!= TXRX_CONTINUE
)
1129 skb
= tx
.skb
; /* handlers are allowed to change skb */
1134 if (unlikely(res
== TXRX_DROP
)) {
1135 I802_DEBUG_INC(local
->tx_handlers_drop
);
1139 if (unlikely(res
== TXRX_QUEUED
)) {
1140 I802_DEBUG_INC(local
->tx_handlers_queued
);
1144 if (tx
.u
.tx
.extra_frag
) {
1145 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1147 struct ieee80211_hdr
*hdr
=
1148 (struct ieee80211_hdr
*)
1149 tx
.u
.tx
.extra_frag
[i
]->data
;
1151 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1152 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1155 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1156 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1158 dur
= ieee80211_duration(&tx
, 0, next_len
);
1159 hdr
->duration_id
= cpu_to_le16(dur
);
1164 ret
= __ieee80211_tx(local
, skb
, &tx
);
1166 struct ieee80211_tx_stored_packet
*store
=
1167 &local
->pending_packet
[control
->queue
];
1169 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1171 set_bit(IEEE80211_LINK_STATE_PENDING
,
1172 &local
->state
[control
->queue
]);
1174 /* When the driver gets out of buffers during sending of
1175 * fragments and calls ieee80211_stop_queue, there is
1176 * a small window between IEEE80211_LINK_STATE_XOFF and
1177 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1178 * gets available in that window (i.e. driver calls
1179 * ieee80211_wake_queue), we would end up with ieee80211_tx
1180 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1181 * continuing transmitting here when that situation is
1182 * possible to have happened. */
1183 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1184 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1185 &local
->state
[control
->queue
]);
1188 memcpy(&store
->control
, control
,
1189 sizeof(struct ieee80211_tx_control
));
1191 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1192 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1193 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1194 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1195 store
->last_frag_rate_ctrl_probe
=
1196 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1203 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1204 if (tx
.u
.tx
.extra_frag
[i
])
1205 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1206 kfree(tx
.u
.tx
.extra_frag
);
1210 /* device xmit handlers */
1212 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1213 struct net_device
*dev
)
1215 struct ieee80211_tx_control control
;
1216 struct ieee80211_tx_packet_data
*pkt_data
;
1217 struct net_device
*odev
= NULL
;
1218 struct ieee80211_sub_if_data
*osdata
;
1223 * copy control out of the skb so other people can use skb->cb
1225 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1226 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1228 if (pkt_data
->ifindex
)
1229 odev
= dev_get_by_index(pkt_data
->ifindex
);
1230 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1234 if (unlikely(!odev
)) {
1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1236 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1237 "originating device\n", dev
->name
);
1242 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1244 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1245 if (skb_headroom(skb
) < headroom
) {
1246 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1253 control
.ifindex
= odev
->ifindex
;
1254 control
.type
= osdata
->type
;
1255 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1256 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1257 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1258 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1259 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1260 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1261 control
.queue
= pkt_data
->queue
;
1263 ret
= ieee80211_tx(odev
, skb
, &control
,
1264 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1270 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1271 struct net_device
*dev
)
1273 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1274 struct ieee80211_tx_packet_data
*pkt_data
;
1275 struct ieee80211_radiotap_header
*prthdr
=
1276 (struct ieee80211_radiotap_header
*)skb
->data
;
1279 /* check for not even having the fixed radiotap header part */
1280 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1281 goto fail
; /* too short to be possibly valid */
1283 /* is it a header version we can trust to find length from? */
1284 if (unlikely(prthdr
->it_version
))
1285 goto fail
; /* only version 0 is supported */
1287 /* then there must be a radiotap header with a length we can use */
1288 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1290 /* does the skb contain enough to deliver on the alleged length? */
1291 if (unlikely(skb
->len
< len_rthdr
))
1292 goto fail
; /* skb too short for claimed rt header extent */
1294 skb
->dev
= local
->mdev
;
1296 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1297 memset(pkt_data
, 0, sizeof(*pkt_data
));
1298 /* needed because we set skb device to master */
1299 pkt_data
->ifindex
= dev
->ifindex
;
1301 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1304 * fix up the pointers accounting for the radiotap
1305 * header still being in there. We are being given
1306 * a precooked IEEE80211 header so no need for
1309 skb_set_mac_header(skb
, len_rthdr
);
1311 * these are just fixed to the end of the rt area since we
1312 * don't have any better information and at this point, nobody cares
1314 skb_set_network_header(skb
, len_rthdr
);
1315 skb_set_transport_header(skb
, len_rthdr
);
1317 /* pass the radiotap header up to the next stage intact */
1318 dev_queue_xmit(skb
);
1319 return NETDEV_TX_OK
;
1323 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1327 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1328 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1329 * @skb: packet to be sent
1330 * @dev: incoming interface
1332 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1333 * not be freed, and caller is responsible for either retrying later or freeing
1336 * This function takes in an Ethernet header and encapsulates it with suitable
1337 * IEEE 802.11 header based on which interface the packet is coming in. The
1338 * encapsulated packet will then be passed to master interface, wlan#.11, for
1339 * transmission (through low-level driver).
1341 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1342 struct net_device
*dev
)
1344 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1345 struct ieee80211_tx_packet_data
*pkt_data
;
1346 struct ieee80211_sub_if_data
*sdata
;
1347 int ret
= 1, head_need
;
1348 u16 ethertype
, hdrlen
, fc
;
1349 struct ieee80211_hdr hdr
;
1350 const u8
*encaps_data
;
1351 int encaps_len
, skip_header_bytes
;
1353 struct sta_info
*sta
;
1355 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1356 if (unlikely(skb
->len
< ETH_HLEN
)) {
1357 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1358 dev
->name
, skb
->len
);
1363 nh_pos
= skb_network_header(skb
) - skb
->data
;
1364 h_pos
= skb_transport_header(skb
) - skb
->data
;
1366 /* convert Ethernet header to proper 802.11 header (based on
1367 * operation mode) */
1368 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1369 /* TODO: handling for 802.1x authorized/unauthorized port */
1370 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1372 switch (sdata
->type
) {
1373 case IEEE80211_IF_TYPE_AP
:
1374 case IEEE80211_IF_TYPE_VLAN
:
1375 fc
|= IEEE80211_FCTL_FROMDS
;
1377 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1378 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1379 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1382 case IEEE80211_IF_TYPE_WDS
:
1383 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1385 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1386 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1387 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1388 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1391 case IEEE80211_IF_TYPE_STA
:
1392 fc
|= IEEE80211_FCTL_TODS
;
1394 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1395 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1396 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1399 case IEEE80211_IF_TYPE_IBSS
:
1401 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1402 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1403 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1411 /* receiver is QoS enabled, use a QoS type frame */
1412 sta
= sta_info_get(local
, hdr
.addr1
);
1414 if (sta
->flags
& WLAN_STA_WME
) {
1415 fc
|= IEEE80211_STYPE_QOS_DATA
;
1421 hdr
.frame_control
= cpu_to_le16(fc
);
1422 hdr
.duration_id
= 0;
1425 skip_header_bytes
= ETH_HLEN
;
1426 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1427 encaps_data
= bridge_tunnel_header
;
1428 encaps_len
= sizeof(bridge_tunnel_header
);
1429 skip_header_bytes
-= 2;
1430 } else if (ethertype
>= 0x600) {
1431 encaps_data
= rfc1042_header
;
1432 encaps_len
= sizeof(rfc1042_header
);
1433 skip_header_bytes
-= 2;
1439 skb_pull(skb
, skip_header_bytes
);
1440 nh_pos
-= skip_header_bytes
;
1441 h_pos
-= skip_header_bytes
;
1443 /* TODO: implement support for fragments so that there is no need to
1444 * reallocate and copy payload; it might be enough to support one
1445 * extra fragment that would be copied in the beginning of the frame
1446 * data.. anyway, it would be nice to include this into skb structure
1449 * There are few options for this:
1450 * use skb->cb as an extra space for 802.11 header
1451 * allocate new buffer if not enough headroom
1452 * make sure that there is enough headroom in every skb by increasing
1453 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1454 * alloc_skb() (net/core/skbuff.c)
1456 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1457 head_need
-= skb_headroom(skb
);
1459 /* We are going to modify skb data, so make a copy of it if happens to
1460 * be cloned. This could happen, e.g., with Linux bridge code passing
1461 * us broadcast frames. */
1463 if (head_need
> 0 || skb_cloned(skb
)) {
1465 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1466 "of headroom\n", dev
->name
, head_need
);
1469 if (skb_cloned(skb
))
1470 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1472 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1473 /* Since we have to reallocate the buffer, make sure that there
1474 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1475 * before payload and 12 after). */
1476 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1478 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1485 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1486 nh_pos
+= encaps_len
;
1487 h_pos
+= encaps_len
;
1489 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1493 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1494 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1495 pkt_data
->ifindex
= dev
->ifindex
;
1496 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1497 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1499 skb
->dev
= local
->mdev
;
1500 sdata
->stats
.tx_packets
++;
1501 sdata
->stats
.tx_bytes
+= skb
->len
;
1503 /* Update skb pointers to various headers since this modified frame
1504 * is going to go through Linux networking code that may potentially
1505 * need things like pointer to IP header. */
1506 skb_set_mac_header(skb
, 0);
1507 skb_set_network_header(skb
, nh_pos
);
1508 skb_set_transport_header(skb
, h_pos
);
1510 dev
->trans_start
= jiffies
;
1511 dev_queue_xmit(skb
);
1523 * This is the transmit routine for the 802.11 type interfaces
1524 * called by upper layers of the linux networking
1525 * stack when it has a frame to transmit
1527 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1529 struct ieee80211_sub_if_data
*sdata
;
1530 struct ieee80211_tx_packet_data
*pkt_data
;
1531 struct ieee80211_hdr
*hdr
;
1534 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1536 if (skb
->len
< 10) {
1541 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1542 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1549 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1550 fc
= le16_to_cpu(hdr
->frame_control
);
1552 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1553 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1554 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1555 if (sdata
->type
== IEEE80211_IF_TYPE_MGMT
)
1556 pkt_data
->flags
|= IEEE80211_TXPD_MGMT_IFACE
;
1558 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1559 skb
->dev
= sdata
->local
->mdev
;
1562 * We're using the protocol field of the the frame control header
1563 * to request TX callback for hostapd. BIT(1) is checked.
1565 if ((fc
& BIT(1)) == BIT(1)) {
1566 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1568 hdr
->frame_control
= cpu_to_le16(fc
);
1571 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1572 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1574 sdata
->stats
.tx_packets
++;
1575 sdata
->stats
.tx_bytes
+= skb
->len
;
1577 dev_queue_xmit(skb
);
1582 /* helper functions for pending packets for when queues are stopped */
1584 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1587 struct ieee80211_tx_stored_packet
*store
;
1589 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1590 if (!__ieee80211_queue_pending(local
, i
))
1592 store
= &local
->pending_packet
[i
];
1593 kfree_skb(store
->skb
);
1594 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1595 kfree_skb(store
->extra_frag
[j
]);
1596 kfree(store
->extra_frag
);
1597 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1601 void ieee80211_tx_pending(unsigned long data
)
1603 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1604 struct net_device
*dev
= local
->mdev
;
1605 struct ieee80211_tx_stored_packet
*store
;
1606 struct ieee80211_txrx_data tx
;
1607 int i
, ret
, reschedule
= 0;
1609 netif_tx_lock_bh(dev
);
1610 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1611 if (__ieee80211_queue_stopped(local
, i
))
1613 if (!__ieee80211_queue_pending(local
, i
)) {
1617 store
= &local
->pending_packet
[i
];
1618 tx
.u
.tx
.control
= &store
->control
;
1619 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1620 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1621 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1622 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1624 if (store
->last_frag_rate_ctrl_probe
)
1625 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1626 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1628 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1631 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1636 netif_tx_unlock_bh(dev
);
1638 if (!ieee80211_qdisc_installed(dev
)) {
1639 if (!__ieee80211_queue_stopped(local
, 0))
1640 netif_wake_queue(dev
);
1642 netif_schedule(dev
);
1646 /* functions for drivers to get certain frames */
1648 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1649 struct ieee80211_if_ap
*bss
,
1650 struct sk_buff
*skb
)
1654 int i
, have_bits
= 0, n1
, n2
;
1656 /* Generate bitmap for TIM only if there are any STAs in power save
1658 read_lock_bh(&local
->sta_lock
);
1659 if (atomic_read(&bss
->num_sta_ps
) > 0)
1660 /* in the hope that this is faster than
1661 * checking byte-for-byte */
1662 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1663 IEEE80211_MAX_AID
+1);
1665 if (bss
->dtim_count
== 0)
1666 bss
->dtim_count
= bss
->dtim_period
- 1;
1670 tim
= pos
= (u8
*) skb_put(skb
, 6);
1671 *pos
++ = WLAN_EID_TIM
;
1673 *pos
++ = bss
->dtim_count
;
1674 *pos
++ = bss
->dtim_period
;
1676 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1680 /* Find largest even number N1 so that bits numbered 1 through
1681 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1682 * (N2 + 1) x 8 through 2007 are 0. */
1684 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1691 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1698 /* Bitmap control */
1700 /* Part Virt Bitmap */
1701 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1703 tim
[1] = n2
- n1
+ 4;
1704 skb_put(skb
, n2
- n1
);
1706 *pos
++ = aid0
; /* Bitmap control */
1707 *pos
++ = 0; /* Part Virt Bitmap */
1709 read_unlock_bh(&local
->sta_lock
);
1712 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1713 struct ieee80211_tx_control
*control
)
1715 struct ieee80211_local
*local
= hw_to_local(hw
);
1716 struct sk_buff
*skb
;
1717 struct net_device
*bdev
;
1718 struct ieee80211_sub_if_data
*sdata
= NULL
;
1719 struct ieee80211_if_ap
*ap
= NULL
;
1720 struct ieee80211_rate
*rate
;
1721 struct rate_control_extra extra
;
1722 u8
*b_head
, *b_tail
;
1725 bdev
= dev_get_by_index(if_id
);
1727 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1732 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1734 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1735 if (net_ratelimit())
1736 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1737 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1738 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1742 /* Assume we are generating the normal beacon locally */
1743 b_head
= ap
->beacon_head
;
1744 b_tail
= ap
->beacon_tail
;
1745 bh_len
= ap
->beacon_head_len
;
1746 bt_len
= ap
->beacon_tail_len
;
1748 skb
= dev_alloc_skb(local
->tx_headroom
+
1749 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1753 skb_reserve(skb
, local
->tx_headroom
);
1754 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1756 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1758 ieee80211_beacon_add_tim(local
, ap
, skb
);
1761 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1765 memset(&extra
, 0, sizeof(extra
));
1766 extra
.mode
= local
->oper_hw_mode
;
1768 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1770 if (net_ratelimit()) {
1771 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1772 "found\n", local
->mdev
->name
);
1779 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1780 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1781 rate
->val2
: rate
->val
;
1782 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1783 control
->power_level
= local
->hw
.conf
.power_level
;
1784 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1785 control
->retry_limit
= 1;
1786 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1792 EXPORT_SYMBOL(ieee80211_beacon_get
);
1794 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1795 const void *frame
, size_t frame_len
,
1796 const struct ieee80211_tx_control
*frame_txctl
,
1797 struct ieee80211_rts
*rts
)
1799 const struct ieee80211_hdr
*hdr
= frame
;
1802 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1803 rts
->frame_control
= cpu_to_le16(fctl
);
1804 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1805 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1806 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1808 EXPORT_SYMBOL(ieee80211_rts_get
);
1810 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1811 const void *frame
, size_t frame_len
,
1812 const struct ieee80211_tx_control
*frame_txctl
,
1813 struct ieee80211_cts
*cts
)
1815 const struct ieee80211_hdr
*hdr
= frame
;
1818 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1819 cts
->frame_control
= cpu_to_le16(fctl
);
1820 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1821 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1823 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1826 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1827 struct ieee80211_tx_control
*control
)
1829 struct ieee80211_local
*local
= hw_to_local(hw
);
1830 struct sk_buff
*skb
;
1831 struct sta_info
*sta
;
1832 ieee80211_tx_handler
*handler
;
1833 struct ieee80211_txrx_data tx
;
1834 ieee80211_txrx_result res
= TXRX_DROP
;
1835 struct net_device
*bdev
;
1836 struct ieee80211_sub_if_data
*sdata
;
1837 struct ieee80211_if_ap
*bss
= NULL
;
1839 bdev
= dev_get_by_index(if_id
);
1841 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1845 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1848 if (bss
->dtim_count
!= 0)
1849 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1850 memset(control
, 0, sizeof(*control
));
1852 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1855 local
->total_ps_buffered
--;
1857 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1858 struct ieee80211_hdr
*hdr
=
1859 (struct ieee80211_hdr
*) skb
->data
;
1860 /* more buffered multicast/broadcast frames ==> set
1861 * MoreData flag in IEEE 802.11 header to inform PS
1863 hdr
->frame_control
|=
1864 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1867 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1869 dev_kfree_skb_any(skb
);
1872 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1874 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1875 res
= (*handler
)(&tx
);
1876 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1880 skb
= tx
.skb
; /* handlers are allowed to change skb */
1882 if (res
== TXRX_DROP
) {
1883 I802_DEBUG_INC(local
->tx_handlers_drop
);
1886 } else if (res
== TXRX_QUEUED
) {
1887 I802_DEBUG_INC(local
->tx_handlers_queued
);
1896 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);