2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
42 struct ieee80211_hdr
*hdr
)
44 /* Set the sequence number for this frame. */
45 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
47 /* Increase the sequence number. */
48 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
53 const struct sk_buff
*skb
)
55 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
60 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
66 fc
= le16_to_cpu(hdr
->frame_control
);
67 hdrlen
= ieee80211_get_hdrlen(fc
);
68 if (hdrlen
> skb
->len
)
71 printk(" FC=0x%04x DUR=0x%04x",
72 fc
, le16_to_cpu(hdr
->duration_id
));
74 printk(" A1=%s", print_mac(mac
, hdr
->addr1
));
76 printk(" A2=%s", print_mac(mac
, hdr
->addr2
));
78 printk(" A3=%s", print_mac(mac
, hdr
->addr3
));
80 printk(" A4=%s", print_mac(mac
, hdr
->addr4
));
83 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
84 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
88 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
90 static u16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
93 int rate
, mrate
, erp
, dur
, i
;
94 struct ieee80211_rate
*txrate
;
95 struct ieee80211_local
*local
= tx
->local
;
96 struct ieee80211_supported_band
*sband
;
98 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
99 txrate
= &sband
->bitrates
[tx
->rate_idx
];
102 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
103 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
106 * data and mgmt (except PS Poll):
107 * - during CFP: 32768
108 * - during contention period:
109 * if addr1 is group address: 0
110 * if more fragments = 0 and addr1 is individual address: time to
111 * transmit one ACK plus SIFS
112 * if more fragments = 1 and addr1 is individual address: time to
113 * transmit next fragment plus 2 x ACK plus 3 x SIFS
116 * - control response frame (CTS or ACK) shall be transmitted using the
117 * same rate as the immediately previous frame in the frame exchange
118 * sequence, if this rate belongs to the PHY mandatory rates, or else
119 * at the highest possible rate belonging to the PHY rates in the
123 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
124 /* TODO: These control frames are not currently sent by
125 * 80211.o, but should they be implemented, this function
126 * needs to be updated to support duration field calculation.
128 * RTS: time needed to transmit pending data/mgmt frame plus
129 * one CTS frame plus one ACK frame plus 3 x SIFS
130 * CTS: duration of immediately previous RTS minus time
131 * required to transmit CTS and its SIFS
132 * ACK: 0 if immediately previous directed data/mgmt had
133 * more=0, with more=1 duration in ACK frame is duration
134 * from previous frame minus time needed to transmit ACK
136 * PS Poll: BIT(15) | BIT(14) | aid
142 if (0 /* FIX: data/mgmt during CFP */)
145 if (group_addr
) /* Group address as the destination - no ACK */
148 /* Individual destination address:
149 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
150 * CTS and ACK frames shall be transmitted using the highest rate in
151 * basic rate set that is less than or equal to the rate of the
152 * immediately previous frame and that is using the same modulation
153 * (CCK or OFDM). If no basic rate set matches with these requirements,
154 * the highest mandatory rate of the PHY that is less than or equal to
155 * the rate of the previous frame is used.
156 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
159 /* use lowest available if everything fails */
160 mrate
= sband
->bitrates
[0].bitrate
;
161 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
162 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
164 if (r
->bitrate
> txrate
->bitrate
)
167 if (tx
->sdata
->basic_rates
& BIT(i
))
170 switch (sband
->band
) {
171 case IEEE80211_BAND_2GHZ
: {
173 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
174 flag
= IEEE80211_RATE_MANDATORY_G
;
176 flag
= IEEE80211_RATE_MANDATORY_B
;
181 case IEEE80211_BAND_5GHZ
:
182 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
185 case IEEE80211_NUM_BANDS
:
191 /* No matching basic rate found; use highest suitable mandatory
196 /* Time needed to transmit ACK
197 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
198 * to closest integer */
200 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
201 tx
->sdata
->bss_conf
.use_short_preamble
);
204 /* Frame is fragmented: duration increases with time needed to
205 * transmit next fragment plus ACK and 2 x SIFS. */
206 dur
*= 2; /* ACK + SIFS */
208 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
209 txrate
->bitrate
, erp
,
210 tx
->sdata
->bss_conf
.use_short_preamble
);
216 static int inline is_ieee80211_device(struct net_device
*dev
,
217 struct net_device
*master
)
219 return (wdev_priv(dev
->ieee80211_ptr
) ==
220 wdev_priv(master
->ieee80211_ptr
));
225 static ieee80211_tx_result
226 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
229 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
230 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
231 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
234 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
237 if (unlikely(tx
->local
->sta_sw_scanning
) &&
238 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
239 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
242 if (tx
->sdata
->vif
.type
== IEEE80211_IF_TYPE_MESH_POINT
)
245 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
248 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
250 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
251 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
252 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
253 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
254 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
255 DECLARE_MAC_BUF(mac
);
256 printk(KERN_DEBUG
"%s: dropped data frame to not "
257 "associated station %s\n",
258 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
259 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
260 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
264 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
265 tx
->local
->num_sta
== 0 &&
266 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
)) {
268 * No associated STAs - no need to send multicast
279 static ieee80211_tx_result
280 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
282 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
284 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
285 ieee80211_include_sequence(tx
->sdata
, hdr
);
290 /* This function is called whenever the AP is about to exceed the maximum limit
291 * of buffered frames for power saving STAs. This situation should not really
292 * happen often during normal operation, so dropping the oldest buffered packet
293 * from each queue should be OK to make some room for new frames. */
294 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
296 int total
= 0, purged
= 0;
298 struct ieee80211_sub_if_data
*sdata
;
299 struct sta_info
*sta
;
302 * virtual interfaces are protected by RCU
306 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
307 struct ieee80211_if_ap
*ap
;
308 if (sdata
->dev
== local
->mdev
||
309 sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
)
312 skb
= skb_dequeue(&ap
->ps_bc_buf
);
317 total
+= skb_queue_len(&ap
->ps_bc_buf
);
320 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
321 skb
= skb_dequeue(&sta
->ps_tx_buf
);
326 total
+= skb_queue_len(&sta
->ps_tx_buf
);
331 local
->total_ps_buffered
= total
;
332 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
333 wiphy_name(local
->hw
.wiphy
), purged
);
336 static ieee80211_tx_result
337 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
339 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
342 * broadcast/multicast frame
344 * If any of the associated stations is in power save mode,
345 * the frame is buffered to be sent after DTIM beacon frame.
346 * This is done either by the hardware or us.
349 /* not AP/IBSS or ordered frame */
350 if (!tx
->sdata
->bss
|| (tx
->fc
& IEEE80211_FCTL_ORDER
))
353 /* no stations in PS mode */
354 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
357 /* buffered in mac80211 */
358 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
359 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
360 purge_old_ps_buffers(tx
->local
);
361 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
363 if (net_ratelimit()) {
364 printk(KERN_DEBUG
"%s: BC TX buffer full - "
365 "dropping the oldest frame\n",
368 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
370 tx
->local
->total_ps_buffered
++;
371 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
375 /* buffered in hardware */
376 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
381 static ieee80211_tx_result
382 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
384 struct sta_info
*sta
= tx
->sta
;
385 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
387 DECLARE_MAC_BUF(mac
);
390 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
391 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
394 staflags
= get_sta_flags(sta
);
396 if (unlikely((staflags
& WLAN_STA_PS
) &&
397 !(staflags
& WLAN_STA_PSPOLL
))) {
398 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
401 print_mac(mac
, sta
->addr
), sta
->aid
,
402 skb_queue_len(&sta
->ps_tx_buf
));
403 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
404 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
405 purge_old_ps_buffers(tx
->local
);
406 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
407 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
408 if (net_ratelimit()) {
409 printk(KERN_DEBUG
"%s: STA %s TX "
410 "buffer full - dropping oldest frame\n",
411 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
415 tx
->local
->total_ps_buffered
++;
417 /* Queue frame to be sent after STA sends an PS Poll frame */
418 if (skb_queue_empty(&sta
->ps_tx_buf
))
419 sta_info_set_tim_bit(sta
);
421 info
->control
.jiffies
= jiffies
;
422 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
425 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
426 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
427 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
428 "set -> send frame\n", tx
->dev
->name
,
429 print_mac(mac
, sta
->addr
));
431 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
432 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
437 static ieee80211_tx_result
438 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
440 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
443 if (tx
->flags
& IEEE80211_TX_UNICAST
)
444 return ieee80211_tx_h_unicast_ps_buf(tx
);
446 return ieee80211_tx_h_multicast_ps_buf(tx
);
449 static ieee80211_tx_result
450 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
452 struct ieee80211_key
*key
;
453 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
456 if (unlikely(info
->flags
& IEEE80211_TX_CTL_DO_NOT_ENCRYPT
))
458 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
460 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
462 else if (tx
->sdata
->drop_unencrypted
&&
463 !(info
->flags
& IEEE80211_TX_CTL_EAPOL_FRAME
) &&
464 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
465 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
473 tx
->key
->tx_rx_count
++;
474 /* TODO: add threshold stuff again */
476 switch (tx
->key
->conf
.alg
) {
478 ftype
= fc
& IEEE80211_FCTL_FTYPE
;
479 stype
= fc
& IEEE80211_FCTL_STYPE
;
481 if (ftype
== IEEE80211_FTYPE_MGMT
&&
482 stype
== IEEE80211_STYPE_AUTH
)
486 if (!WLAN_FC_DATA_PRESENT(fc
))
492 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
493 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
498 static ieee80211_tx_result
499 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
501 struct rate_selection rsel
;
502 struct ieee80211_supported_band
*sband
;
503 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
505 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
507 if (likely(tx
->rate_idx
< 0)) {
508 rate_control_get_rate(tx
->dev
, sband
, tx
->skb
, &rsel
);
509 tx
->rate_idx
= rsel
.rate_idx
;
510 if (unlikely(rsel
.probe_idx
>= 0)) {
511 info
->flags
|= IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
512 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
513 info
->control
.alt_retry_rate_idx
= tx
->rate_idx
;
514 tx
->rate_idx
= rsel
.probe_idx
;
516 info
->control
.alt_retry_rate_idx
= -1;
518 if (unlikely(tx
->rate_idx
< 0))
521 info
->control
.alt_retry_rate_idx
= -1;
523 if (tx
->sdata
->bss_conf
.use_cts_prot
&&
524 (tx
->flags
& IEEE80211_TX_FRAGMENTED
) && (rsel
.nonerp_idx
>= 0)) {
525 tx
->last_frag_rate_idx
= tx
->rate_idx
;
526 if (rsel
.probe_idx
>= 0)
527 tx
->flags
&= ~IEEE80211_TX_PROBE_LAST_FRAG
;
529 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
530 tx
->rate_idx
= rsel
.nonerp_idx
;
531 info
->tx_rate_idx
= rsel
.nonerp_idx
;
532 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
534 tx
->last_frag_rate_idx
= tx
->rate_idx
;
535 info
->tx_rate_idx
= tx
->rate_idx
;
537 info
->tx_rate_idx
= tx
->rate_idx
;
542 static ieee80211_tx_result
543 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
545 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
546 u16 fc
= le16_to_cpu(hdr
->frame_control
);
548 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
549 struct ieee80211_supported_band
*sband
;
551 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
554 info
->control
.aid
= tx
->sta
->aid
;
556 if (!info
->control
.retry_limit
) {
557 if (!is_multicast_ether_addr(hdr
->addr1
)) {
558 int len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
559 tx
->local
->fragmentation_threshold
);
560 if (len
> tx
->local
->rts_threshold
561 && tx
->local
->rts_threshold
<
562 IEEE80211_MAX_RTS_THRESHOLD
) {
563 info
->flags
|= IEEE80211_TX_CTL_USE_RTS_CTS
;
565 IEEE80211_TX_CTL_LONG_RETRY_LIMIT
;
566 info
->control
.retry_limit
=
567 tx
->local
->long_retry_limit
;
569 info
->control
.retry_limit
=
570 tx
->local
->short_retry_limit
;
573 info
->control
.retry_limit
= 1;
577 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
578 /* Do not use multiple retry rates when sending fragmented
580 * TODO: The last fragment could still use multiple retry
582 info
->control
.alt_retry_rate_idx
= -1;
585 /* Use CTS protection for unicast frames sent using extended rates if
586 * there are associated non-ERP stations and RTS/CTS is not configured
588 if ((tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
) &&
589 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_ERP_G
) &&
590 (tx
->flags
& IEEE80211_TX_UNICAST
) &&
591 tx
->sdata
->bss_conf
.use_cts_prot
&&
592 !(info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
))
593 info
->flags
|= IEEE80211_TX_CTL_USE_CTS_PROTECT
;
595 /* Transmit data frames using short preambles if the driver supports
596 * short preambles at the selected rate and short preambles are
597 * available on the network at the current point in time. */
598 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
599 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
) &&
600 tx
->sdata
->bss_conf
.use_short_preamble
&&
601 (!tx
->sta
|| test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))) {
602 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
605 /* Setup duration field for the first fragment of the frame. Duration
606 * for remaining fragments will be updated when they are being sent
607 * to low-level driver in ieee80211_tx(). */
608 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
609 (tx
->flags
& IEEE80211_TX_FRAGMENTED
) ?
610 tx
->extra_frag
[0]->len
: 0);
611 hdr
->duration_id
= cpu_to_le16(dur
);
613 if ((info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
) ||
614 (info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)) {
615 struct ieee80211_supported_band
*sband
;
616 struct ieee80211_rate
*rate
;
620 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
622 /* Do not use multiple retry rates when using RTS/CTS */
623 info
->control
.alt_retry_rate_idx
= -1;
625 /* Use min(data rate, max base rate) as CTS/RTS rate */
626 rate
= &sband
->bitrates
[tx
->rate_idx
];
628 for (idx
= 0; idx
< sband
->n_bitrates
; idx
++) {
629 if (sband
->bitrates
[idx
].bitrate
> rate
->bitrate
)
631 if (tx
->sdata
->basic_rates
& BIT(idx
) &&
633 (sband
->bitrates
[baserate
].bitrate
634 < sband
->bitrates
[idx
].bitrate
)))
639 info
->control
.rts_cts_rate_idx
= baserate
;
641 info
->control
.rts_cts_rate_idx
= 0;
645 info
->control
.aid
= tx
->sta
->aid
;
650 static ieee80211_tx_result
651 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
653 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
654 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
655 struct sk_buff
**frags
, *first
, *frag
;
659 int frag_threshold
= tx
->local
->fragmentation_threshold
;
661 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
665 * Warn when submitting a fragmented A-MPDU frame and drop it.
666 * This is an error and needs to be fixed elsewhere, but when
667 * done needs to take care of monitor interfaces (injection)
670 if (WARN_ON(tx
->flags
& IEEE80211_TX_CTL_AMPDU
||
671 skb_get_queue_mapping(tx
->skb
) >=
672 ieee80211_num_regular_queues(&tx
->local
->hw
)))
677 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
678 payload_len
= first
->len
- hdrlen
;
679 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
680 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
682 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
686 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
687 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
688 pos
= first
->data
+ hdrlen
+ per_fragm
;
689 left
= payload_len
- per_fragm
;
690 for (i
= 0; i
< num_fragm
- 1; i
++) {
691 struct ieee80211_hdr
*fhdr
;
697 /* reserve enough extra head and tail room for possible
700 dev_alloc_skb(tx
->local
->tx_headroom
+
702 IEEE80211_ENCRYPT_HEADROOM
+
703 IEEE80211_ENCRYPT_TAILROOM
);
706 /* Make sure that all fragments use the same priority so
707 * that they end up using the same TX queue */
708 frag
->priority
= first
->priority
;
709 skb_reserve(frag
, tx
->local
->tx_headroom
+
710 IEEE80211_ENCRYPT_HEADROOM
);
711 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
712 memcpy(fhdr
, first
->data
, hdrlen
);
713 if (i
== num_fragm
- 2)
714 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
715 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
716 copylen
= left
> per_fragm
? per_fragm
: left
;
717 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
722 skb_trim(first
, hdrlen
+ per_fragm
);
724 tx
->num_extra_frag
= num_fragm
- 1;
725 tx
->extra_frag
= frags
;
730 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
732 for (i
= 0; i
< num_fragm
- 1; i
++)
734 dev_kfree_skb(frags
[i
]);
737 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
741 static ieee80211_tx_result
742 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
747 switch (tx
->key
->conf
.alg
) {
749 return ieee80211_crypto_wep_encrypt(tx
);
751 return ieee80211_crypto_tkip_encrypt(tx
);
753 return ieee80211_crypto_ccmp_encrypt(tx
);
761 static ieee80211_tx_result
762 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
764 struct ieee80211_local
*local
= tx
->local
;
765 struct sk_buff
*skb
= tx
->skb
;
766 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
767 u32 load
= 0, hdrtime
;
768 struct ieee80211_rate
*rate
;
769 struct ieee80211_supported_band
*sband
;
770 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
772 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
773 rate
= &sband
->bitrates
[tx
->rate_idx
];
775 /* TODO: this could be part of tx_status handling, so that the number
776 * of retries would be known; TX rate should in that case be stored
777 * somewhere with the packet */
779 /* Estimate total channel use caused by this frame */
781 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
782 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
784 if (tx
->channel
->band
== IEEE80211_BAND_5GHZ
||
785 (tx
->channel
->band
== IEEE80211_BAND_2GHZ
&&
786 rate
->flags
& IEEE80211_RATE_ERP_G
))
787 hdrtime
= CHAN_UTIL_HDR_SHORT
;
789 hdrtime
= CHAN_UTIL_HDR_LONG
;
792 if (!is_multicast_ether_addr(hdr
->addr1
))
795 if (info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
)
797 else if (info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)
800 /* TODO: optimise again */
801 load
+= skb
->len
* CHAN_UTIL_RATE_LCM
/ rate
->bitrate
;
803 if (tx
->extra_frag
) {
805 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
807 load
+= tx
->extra_frag
[i
]->len
*
812 /* Divide channel_use by 8 to avoid wrapping around the counter */
813 load
>>= CHAN_UTIL_SHIFT
;
814 local
->channel_use_raw
+= load
;
816 tx
->sta
->channel_use_raw
+= load
;
817 tx
->sdata
->channel_use_raw
+= load
;
820 tx
->sta
->tx_packets
++;
821 tx
->sta
->tx_fragments
++;
822 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
823 if (tx
->extra_frag
) {
825 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
826 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
828 tx
->extra_frag
[i
]->len
;
837 typedef ieee80211_tx_result (*ieee80211_tx_handler
)(struct ieee80211_tx_data
*);
838 static ieee80211_tx_handler ieee80211_tx_handlers
[] =
840 ieee80211_tx_h_check_assoc
,
841 ieee80211_tx_h_sequence
,
842 ieee80211_tx_h_ps_buf
,
843 ieee80211_tx_h_select_key
,
844 ieee80211_tx_h_michael_mic_add
,
845 ieee80211_tx_h_rate_ctrl
,
847 ieee80211_tx_h_fragment
,
848 /* handlers after fragment must be aware of tx info fragmentation! */
849 ieee80211_tx_h_encrypt
,
850 ieee80211_tx_h_stats
,
854 /* actual transmit path */
857 * deal with packet injection down monitor interface
858 * with Radiotap Header -- only called for monitor mode interface
860 static ieee80211_tx_result
861 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
865 * this is the moment to interpret and discard the radiotap header that
866 * must be at the start of the packet injected in Monitor mode
868 * Need to take some care with endian-ness since radiotap
869 * args are little-endian
872 struct ieee80211_radiotap_iterator iterator
;
873 struct ieee80211_radiotap_header
*rthdr
=
874 (struct ieee80211_radiotap_header
*) skb
->data
;
875 struct ieee80211_supported_band
*sband
;
876 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
877 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
879 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
881 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
882 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
883 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
886 * for every radiotap entry that is present
887 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
888 * entries present, or -EINVAL on error)
894 ret
= ieee80211_radiotap_iterator_next(&iterator
);
899 /* see if this argument is something we can use */
900 switch (iterator
.this_arg_index
) {
902 * You must take care when dereferencing iterator.this_arg
903 * for multibyte types... the pointer is not aligned. Use
904 * get_unaligned((type *)iterator.this_arg) to dereference
905 * iterator.this_arg for type "type" safely on all arches.
907 case IEEE80211_RADIOTAP_RATE
:
909 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
910 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
912 target_rate
= (*iterator
.this_arg
) * 5;
913 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
914 struct ieee80211_rate
*r
;
916 r
= &sband
->bitrates
[i
];
918 if (r
->bitrate
== target_rate
) {
925 case IEEE80211_RADIOTAP_ANTENNA
:
927 * radiotap uses 0 for 1st ant, mac80211 is 1 for
930 info
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
934 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
935 control
->power_level
= *iterator
.this_arg
;
939 case IEEE80211_RADIOTAP_FLAGS
:
940 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
942 * this indicates that the skb we have been
943 * handed has the 32-bit FCS CRC at the end...
944 * we should react to that by snipping it off
945 * because it will be recomputed and added
948 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
951 skb_trim(skb
, skb
->len
- FCS_LEN
);
953 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
955 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
956 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
957 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
961 * Please update the file
962 * Documentation/networking/mac80211-injection.txt
963 * when parsing new fields here.
971 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
975 * remove the radiotap header
976 * iterator->max_length was sanity-checked against
977 * skb->len by iterator init
979 skb_pull(skb
, iterator
.max_length
);
987 static ieee80211_tx_result
988 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
990 struct net_device
*dev
)
992 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
993 struct ieee80211_hdr
*hdr
;
994 struct ieee80211_sub_if_data
*sdata
;
995 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
999 memset(tx
, 0, sizeof(*tx
));
1001 tx
->dev
= dev
; /* use original interface */
1003 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1004 tx
->channel
= local
->hw
.conf
.channel
;
1006 * Set this flag (used below to indicate "automatic fragmentation"),
1007 * it will be cleared/left by radiotap as desired.
1009 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1011 /* process and remove the injection radiotap header */
1012 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1013 if (unlikely(sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)) {
1014 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1018 * __ieee80211_parse_tx_radiotap has now removed
1019 * the radiotap header that was present and pre-filled
1020 * 'tx' with tx control information.
1024 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1026 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1027 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
1029 if (is_multicast_ether_addr(hdr
->addr1
)) {
1030 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1031 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1033 tx
->flags
|= IEEE80211_TX_UNICAST
;
1034 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1037 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1038 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1039 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1040 !local
->ops
->set_frag_threshold
)
1041 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1043 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1047 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1048 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1049 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1051 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1052 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1053 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1054 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1056 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1062 * NB: @tx is uninitialised when passed in here
1064 static int ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
1065 struct sk_buff
*skb
,
1066 struct net_device
*mdev
)
1068 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1069 struct net_device
*dev
;
1071 dev
= dev_get_by_index(&init_net
, info
->control
.ifindex
);
1072 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1078 /* initialises tx with control */
1079 __ieee80211_tx_prepare(tx
, skb
, dev
);
1084 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1085 struct ieee80211_tx_data
*tx
)
1087 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1090 if (netif_subqueue_stopped(local
->mdev
, skb
))
1091 return IEEE80211_TX_AGAIN
;
1094 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1095 "TX to low-level driver", skb
);
1096 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1098 return IEEE80211_TX_AGAIN
;
1099 local
->mdev
->trans_start
= jiffies
;
1100 ieee80211_led_tx(local
, 1);
1102 if (tx
->extra_frag
) {
1103 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1104 if (!tx
->extra_frag
[i
])
1106 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1107 info
->flags
&= ~(IEEE80211_TX_CTL_USE_RTS_CTS
|
1108 IEEE80211_TX_CTL_USE_CTS_PROTECT
|
1109 IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1110 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1111 if (netif_subqueue_stopped(local
->mdev
,
1113 return IEEE80211_TX_FRAG_AGAIN
;
1114 if (i
== tx
->num_extra_frag
) {
1115 info
->tx_rate_idx
= tx
->last_frag_rate_idx
;
1117 if (tx
->flags
& IEEE80211_TX_PROBE_LAST_FRAG
)
1119 IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1122 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1125 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1126 "TX to low-level driver",
1128 ret
= local
->ops
->tx(local_to_hw(local
),
1131 return IEEE80211_TX_FRAG_AGAIN
;
1132 local
->mdev
->trans_start
= jiffies
;
1133 ieee80211_led_tx(local
, 1);
1134 tx
->extra_frag
[i
] = NULL
;
1136 kfree(tx
->extra_frag
);
1137 tx
->extra_frag
= NULL
;
1139 return IEEE80211_TX_OK
;
1142 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1144 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1145 struct sta_info
*sta
;
1146 ieee80211_tx_handler
*handler
;
1147 struct ieee80211_tx_data tx
;
1148 ieee80211_tx_result res
= TX_DROP
, res_prepare
;
1149 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1153 queue
= skb_get_queue_mapping(skb
);
1155 WARN_ON(test_bit(queue
, local
->queues_pending
));
1157 if (unlikely(skb
->len
< 10)) {
1164 /* initialises tx */
1165 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1167 if (res_prepare
== TX_DROP
) {
1174 tx
.channel
= local
->hw
.conf
.channel
;
1175 info
->band
= tx
.channel
->band
;
1177 for (handler
= ieee80211_tx_handlers
; *handler
!= NULL
;
1179 res
= (*handler
)(&tx
);
1180 if (res
!= TX_CONTINUE
)
1184 if (WARN_ON(tx
.skb
!= skb
))
1187 if (unlikely(res
== TX_DROP
)) {
1188 I802_DEBUG_INC(local
->tx_handlers_drop
);
1192 if (unlikely(res
== TX_QUEUED
)) {
1193 I802_DEBUG_INC(local
->tx_handlers_queued
);
1198 if (tx
.extra_frag
) {
1199 for (i
= 0; i
< tx
.num_extra_frag
; i
++) {
1201 struct ieee80211_hdr
*hdr
=
1202 (struct ieee80211_hdr
*)
1203 tx
.extra_frag
[i
]->data
;
1205 if (i
+ 1 < tx
.num_extra_frag
) {
1206 next_len
= tx
.extra_frag
[i
+ 1]->len
;
1209 tx
.rate_idx
= tx
.last_frag_rate_idx
;
1211 dur
= ieee80211_duration(&tx
, 0, next_len
);
1212 hdr
->duration_id
= cpu_to_le16(dur
);
1217 ret
= __ieee80211_tx(local
, skb
, &tx
);
1219 struct ieee80211_tx_stored_packet
*store
;
1222 * Since there are no fragmented frames on A-MPDU
1223 * queues, there's no reason for a driver to reject
1224 * a frame there, warn and drop it.
1226 if (WARN_ON(queue
>= ieee80211_num_regular_queues(&local
->hw
)))
1229 store
= &local
->pending_packet
[queue
];
1231 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1233 set_bit(queue
, local
->queues_pending
);
1236 * When the driver gets out of buffers during sending of
1237 * fragments and calls ieee80211_stop_queue, the netif
1238 * subqueue is stopped. There is, however, a small window
1239 * in which the PENDING bit is not yet set. If a buffer
1240 * gets available in that window (i.e. driver calls
1241 * ieee80211_wake_queue), we would end up with ieee80211_tx
1242 * called with the PENDING bit still set. Prevent this by
1243 * continuing transmitting here when that situation is
1244 * possible to have happened.
1246 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1247 clear_bit(queue
, local
->queues_pending
);
1251 store
->extra_frag
= tx
.extra_frag
;
1252 store
->num_extra_frag
= tx
.num_extra_frag
;
1253 store
->last_frag_rate_idx
= tx
.last_frag_rate_idx
;
1254 store
->last_frag_rate_ctrl_probe
=
1255 !!(tx
.flags
& IEEE80211_TX_PROBE_LAST_FRAG
);
1263 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1264 if (tx
.extra_frag
[i
])
1265 dev_kfree_skb(tx
.extra_frag
[i
]);
1266 kfree(tx
.extra_frag
);
1271 /* device xmit handlers */
1273 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1274 struct net_device
*dev
)
1276 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1277 struct net_device
*odev
= NULL
;
1278 struct ieee80211_sub_if_data
*osdata
;
1282 if (info
->control
.ifindex
)
1283 odev
= dev_get_by_index(&init_net
, info
->control
.ifindex
);
1284 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1288 if (unlikely(!odev
)) {
1289 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1290 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1291 "originating device\n", dev
->name
);
1297 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1299 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1300 if (skb_headroom(skb
) < headroom
) {
1301 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1308 info
->control
.vif
= &osdata
->vif
;
1309 ret
= ieee80211_tx(odev
, skb
);
1315 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1316 struct net_device
*dev
)
1318 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1319 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1320 struct ieee80211_radiotap_header
*prthdr
=
1321 (struct ieee80211_radiotap_header
*)skb
->data
;
1324 /* check for not even having the fixed radiotap header part */
1325 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1326 goto fail
; /* too short to be possibly valid */
1328 /* is it a header version we can trust to find length from? */
1329 if (unlikely(prthdr
->it_version
))
1330 goto fail
; /* only version 0 is supported */
1332 /* then there must be a radiotap header with a length we can use */
1333 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1335 /* does the skb contain enough to deliver on the alleged length? */
1336 if (unlikely(skb
->len
< len_rthdr
))
1337 goto fail
; /* skb too short for claimed rt header extent */
1339 skb
->dev
= local
->mdev
;
1341 /* needed because we set skb device to master */
1342 info
->control
.ifindex
= dev
->ifindex
;
1344 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
1345 /* Interfaces should always request a status report */
1346 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1349 * fix up the pointers accounting for the radiotap
1350 * header still being in there. We are being given
1351 * a precooked IEEE80211 header so no need for
1354 skb_set_mac_header(skb
, len_rthdr
);
1356 * these are just fixed to the end of the rt area since we
1357 * don't have any better information and at this point, nobody cares
1359 skb_set_network_header(skb
, len_rthdr
);
1360 skb_set_transport_header(skb
, len_rthdr
);
1362 /* pass the radiotap header up to the next stage intact */
1363 dev_queue_xmit(skb
);
1364 return NETDEV_TX_OK
;
1368 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1372 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1373 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1374 * @skb: packet to be sent
1375 * @dev: incoming interface
1377 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1378 * not be freed, and caller is responsible for either retrying later or freeing
1381 * This function takes in an Ethernet header and encapsulates it with suitable
1382 * IEEE 802.11 header based on which interface the packet is coming in. The
1383 * encapsulated packet will then be passed to master interface, wlan#.11, for
1384 * transmission (through low-level driver).
1386 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1387 struct net_device
*dev
)
1389 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1390 struct ieee80211_tx_info
*info
;
1391 struct ieee80211_sub_if_data
*sdata
;
1392 int ret
= 1, head_need
;
1393 u16 ethertype
, hdrlen
, meshhdrlen
= 0, fc
;
1394 struct ieee80211_hdr hdr
;
1395 struct ieee80211s_hdr mesh_hdr
;
1396 const u8
*encaps_data
;
1397 int encaps_len
, skip_header_bytes
;
1399 struct sta_info
*sta
;
1402 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1403 if (unlikely(skb
->len
< ETH_HLEN
)) {
1404 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1405 dev
->name
, skb
->len
);
1410 nh_pos
= skb_network_header(skb
) - skb
->data
;
1411 h_pos
= skb_transport_header(skb
) - skb
->data
;
1413 /* convert Ethernet header to proper 802.11 header (based on
1414 * operation mode) */
1415 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1416 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1418 switch (sdata
->vif
.type
) {
1419 case IEEE80211_IF_TYPE_AP
:
1420 case IEEE80211_IF_TYPE_VLAN
:
1421 fc
|= IEEE80211_FCTL_FROMDS
;
1423 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1424 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1425 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1428 case IEEE80211_IF_TYPE_WDS
:
1429 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1431 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1432 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1433 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1434 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1437 #ifdef CONFIG_MAC80211_MESH
1438 case IEEE80211_IF_TYPE_MESH_POINT
:
1439 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1441 if (is_multicast_ether_addr(skb
->data
))
1442 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1443 else if (mesh_nexthop_lookup(hdr
.addr1
, skb
, dev
))
1445 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1446 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1447 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1448 if (skb
->pkt_type
== PACKET_OTHERHOST
) {
1449 /* Forwarded frame, keep mesh ttl and seqnum */
1450 struct ieee80211s_hdr
*prev_meshhdr
;
1451 prev_meshhdr
= ((struct ieee80211s_hdr
*)skb
->cb
);
1452 meshhdrlen
= ieee80211_get_mesh_hdrlen(prev_meshhdr
);
1453 memcpy(&mesh_hdr
, prev_meshhdr
, meshhdrlen
);
1454 sdata
->u
.sta
.mshstats
.fwded_frames
++;
1456 if (!sdata
->u
.sta
.mshcfg
.dot11MeshTTL
) {
1457 /* Do not send frames with mesh_ttl == 0 */
1458 sdata
->u
.sta
.mshstats
.dropped_frames_ttl
++;
1462 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1468 case IEEE80211_IF_TYPE_STA
:
1469 fc
|= IEEE80211_FCTL_TODS
;
1471 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1472 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1473 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1476 case IEEE80211_IF_TYPE_IBSS
:
1478 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1479 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1480 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1489 * There's no need to try to look up the destination
1490 * if it is a multicast address (which can only happen
1493 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1495 sta
= sta_info_get(local
, hdr
.addr1
);
1497 sta_flags
= get_sta_flags(sta
);
1501 /* receiver and we are QoS enabled, use a QoS type frame */
1502 if (sta_flags
& WLAN_STA_WME
&&
1503 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1504 fc
|= IEEE80211_STYPE_QOS_DATA
;
1509 * Drop unicast frames to unauthorised stations unless they are
1510 * EAPOL frames from the local station.
1512 if (unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1513 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1514 !(ethertype
== ETH_P_PAE
&&
1515 compare_ether_addr(dev
->dev_addr
,
1516 skb
->data
+ ETH_ALEN
) == 0))) {
1517 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1518 DECLARE_MAC_BUF(mac
);
1520 if (net_ratelimit())
1521 printk(KERN_DEBUG
"%s: dropped frame to %s"
1522 " (unauthorized port)\n", dev
->name
,
1523 print_mac(mac
, hdr
.addr1
));
1526 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1532 hdr
.frame_control
= cpu_to_le16(fc
);
1533 hdr
.duration_id
= 0;
1536 skip_header_bytes
= ETH_HLEN
;
1537 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1538 encaps_data
= bridge_tunnel_header
;
1539 encaps_len
= sizeof(bridge_tunnel_header
);
1540 skip_header_bytes
-= 2;
1541 } else if (ethertype
>= 0x600) {
1542 encaps_data
= rfc1042_header
;
1543 encaps_len
= sizeof(rfc1042_header
);
1544 skip_header_bytes
-= 2;
1550 skb_pull(skb
, skip_header_bytes
);
1551 nh_pos
-= skip_header_bytes
;
1552 h_pos
-= skip_header_bytes
;
1554 /* TODO: implement support for fragments so that there is no need to
1555 * reallocate and copy payload; it might be enough to support one
1556 * extra fragment that would be copied in the beginning of the frame
1557 * data.. anyway, it would be nice to include this into skb structure
1560 * There are few options for this:
1561 * use skb->cb as an extra space for 802.11 header
1562 * allocate new buffer if not enough headroom
1563 * make sure that there is enough headroom in every skb by increasing
1564 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1565 * alloc_skb() (net/core/skbuff.c)
1567 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
+ local
->tx_headroom
;
1568 head_need
-= skb_headroom(skb
);
1570 /* We are going to modify skb data, so make a copy of it if happens to
1571 * be cloned. This could happen, e.g., with Linux bridge code passing
1572 * us broadcast frames. */
1574 if (head_need
> 0 || skb_header_cloned(skb
)) {
1576 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1577 "of headroom\n", dev
->name
, head_need
);
1580 if (skb_header_cloned(skb
))
1581 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1583 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1584 /* Since we have to reallocate the buffer, make sure that there
1585 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1586 * before payload and 12 after). */
1587 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1589 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1596 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1597 nh_pos
+= encaps_len
;
1598 h_pos
+= encaps_len
;
1601 if (meshhdrlen
> 0) {
1602 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1603 nh_pos
+= meshhdrlen
;
1604 h_pos
+= meshhdrlen
;
1607 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1608 __le16
*qos_control
;
1610 qos_control
= (__le16
*) skb_push(skb
, 2);
1611 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1613 * Maybe we could actually set some fields here, for now just
1614 * initialise to zero to indicate no special operation.
1618 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1623 info
= IEEE80211_SKB_CB(skb
);
1624 memset(info
, 0, sizeof(*info
));
1625 info
->control
.ifindex
= dev
->ifindex
;
1626 if (ethertype
== ETH_P_PAE
)
1627 info
->flags
|= IEEE80211_TX_CTL_EAPOL_FRAME
;
1629 /* Interfaces should always request a status report */
1630 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1632 skb
->dev
= local
->mdev
;
1633 dev
->stats
.tx_packets
++;
1634 dev
->stats
.tx_bytes
+= skb
->len
;
1636 /* Update skb pointers to various headers since this modified frame
1637 * is going to go through Linux networking code that may potentially
1638 * need things like pointer to IP header. */
1639 skb_set_mac_header(skb
, 0);
1640 skb_set_network_header(skb
, nh_pos
);
1641 skb_set_transport_header(skb
, h_pos
);
1643 dev
->trans_start
= jiffies
;
1644 dev_queue_xmit(skb
);
1657 * ieee80211_clear_tx_pending may not be called in a context where
1658 * it is possible that it packets could come in again.
1660 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1663 struct ieee80211_tx_stored_packet
*store
;
1665 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1666 if (!test_bit(i
, local
->queues_pending
))
1668 store
= &local
->pending_packet
[i
];
1669 kfree_skb(store
->skb
);
1670 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1671 kfree_skb(store
->extra_frag
[j
]);
1672 kfree(store
->extra_frag
);
1673 clear_bit(i
, local
->queues_pending
);
1678 * Transmit all pending packets. Called from tasklet, locks master device
1679 * TX lock so that no new packets can come in.
1681 void ieee80211_tx_pending(unsigned long data
)
1683 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1684 struct net_device
*dev
= local
->mdev
;
1685 struct ieee80211_tx_stored_packet
*store
;
1686 struct ieee80211_tx_data tx
;
1689 netif_tx_lock_bh(dev
);
1690 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1691 /* Check that this queue is ok */
1692 if (__netif_subqueue_stopped(local
->mdev
, i
))
1695 if (!test_bit(i
, local
->queues_pending
)) {
1696 ieee80211_wake_queue(&local
->hw
, i
);
1700 store
= &local
->pending_packet
[i
];
1701 tx
.extra_frag
= store
->extra_frag
;
1702 tx
.num_extra_frag
= store
->num_extra_frag
;
1703 tx
.last_frag_rate_idx
= store
->last_frag_rate_idx
;
1705 if (store
->last_frag_rate_ctrl_probe
)
1706 tx
.flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
1707 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1709 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1712 clear_bit(i
, local
->queues_pending
);
1713 ieee80211_wake_queue(&local
->hw
, i
);
1716 netif_tx_unlock_bh(dev
);
1719 /* functions for drivers to get certain frames */
1721 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1722 struct ieee80211_if_ap
*bss
,
1723 struct sk_buff
*skb
,
1724 struct beacon_data
*beacon
)
1728 int i
, have_bits
= 0, n1
, n2
;
1730 /* Generate bitmap for TIM only if there are any STAs in power save
1732 if (atomic_read(&bss
->num_sta_ps
) > 0)
1733 /* in the hope that this is faster than
1734 * checking byte-for-byte */
1735 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1736 IEEE80211_MAX_AID
+1);
1738 if (bss
->dtim_count
== 0)
1739 bss
->dtim_count
= beacon
->dtim_period
- 1;
1743 tim
= pos
= (u8
*) skb_put(skb
, 6);
1744 *pos
++ = WLAN_EID_TIM
;
1746 *pos
++ = bss
->dtim_count
;
1747 *pos
++ = beacon
->dtim_period
;
1749 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1753 /* Find largest even number N1 so that bits numbered 1 through
1754 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1755 * (N2 + 1) x 8 through 2007 are 0. */
1757 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1764 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1771 /* Bitmap control */
1773 /* Part Virt Bitmap */
1774 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1776 tim
[1] = n2
- n1
+ 4;
1777 skb_put(skb
, n2
- n1
);
1779 *pos
++ = aid0
; /* Bitmap control */
1780 *pos
++ = 0; /* Part Virt Bitmap */
1784 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1785 struct ieee80211_vif
*vif
)
1787 struct ieee80211_local
*local
= hw_to_local(hw
);
1788 struct sk_buff
*skb
;
1789 struct ieee80211_tx_info
*info
;
1790 struct net_device
*bdev
;
1791 struct ieee80211_sub_if_data
*sdata
= NULL
;
1792 struct ieee80211_if_ap
*ap
= NULL
;
1793 struct rate_selection rsel
;
1794 struct beacon_data
*beacon
;
1795 struct ieee80211_supported_band
*sband
;
1796 struct ieee80211_mgmt
*mgmt
;
1799 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1802 sband
= local
->hw
.wiphy
->bands
[band
];
1806 sdata
= vif_to_sdata(vif
);
1809 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_AP
) {
1811 beacon
= rcu_dereference(ap
->beacon
);
1814 * headroom, head length,
1815 * tail length and maximum TIM length
1817 skb
= dev_alloc_skb(local
->tx_headroom
+
1819 beacon
->tail_len
+ 256);
1823 skb_reserve(skb
, local
->tx_headroom
);
1824 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1827 ieee80211_include_sequence(sdata
,
1828 (struct ieee80211_hdr
*)skb
->data
);
1831 * Not very nice, but we want to allow the driver to call
1832 * ieee80211_beacon_get() as a response to the set_tim()
1833 * callback. That, however, is already invoked under the
1834 * sta_lock to guarantee consistent and race-free update
1835 * of the tim bitmap in mac80211 and the driver.
1837 if (local
->tim_in_locked_section
) {
1838 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1840 unsigned long flags
;
1842 spin_lock_irqsave(&local
->sta_lock
, flags
);
1843 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1844 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1848 memcpy(skb_put(skb
, beacon
->tail_len
),
1849 beacon
->tail
, beacon
->tail_len
);
1851 num_beacons
= &ap
->num_beacons
;
1855 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1856 /* headroom, head length, tail length and maximum TIM length */
1857 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1861 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1862 mgmt
= (struct ieee80211_mgmt
*)
1863 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
1864 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
1865 mgmt
->frame_control
= IEEE80211_FC(IEEE80211_FTYPE_MGMT
,
1866 IEEE80211_STYPE_BEACON
);
1867 memset(mgmt
->da
, 0xff, ETH_ALEN
);
1868 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1869 /* BSSID is left zeroed, wildcard value */
1870 mgmt
->u
.beacon
.beacon_int
=
1871 cpu_to_le16(local
->hw
.conf
.beacon_int
);
1872 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
1874 pos
= skb_put(skb
, 2);
1875 *pos
++ = WLAN_EID_SSID
;
1878 mesh_mgmt_ies_add(skb
, sdata
->dev
);
1880 num_beacons
= &sdata
->u
.sta
.num_beacons
;
1886 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1887 if (net_ratelimit())
1888 printk(KERN_DEBUG
"no beacon data avail for %s\n",
1890 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1895 info
= IEEE80211_SKB_CB(skb
);
1898 rate_control_get_rate(local
->mdev
, sband
, skb
, &rsel
);
1900 if (unlikely(rsel
.rate_idx
< 0)) {
1901 if (net_ratelimit()) {
1902 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1904 wiphy_name(local
->hw
.wiphy
));
1911 info
->control
.vif
= vif
;
1912 info
->tx_rate_idx
= rsel
.rate_idx
;
1913 if (sdata
->bss_conf
.use_short_preamble
&&
1914 sband
->bitrates
[rsel
.rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
1915 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
1916 info
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1917 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1918 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
1919 info
->control
.retry_limit
= 1;
1920 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1926 EXPORT_SYMBOL(ieee80211_beacon_get
);
1928 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1929 const void *frame
, size_t frame_len
,
1930 const struct ieee80211_tx_info
*frame_txctl
,
1931 struct ieee80211_rts
*rts
)
1933 const struct ieee80211_hdr
*hdr
= frame
;
1936 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1937 rts
->frame_control
= cpu_to_le16(fctl
);
1938 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1940 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1941 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1943 EXPORT_SYMBOL(ieee80211_rts_get
);
1945 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1946 const void *frame
, size_t frame_len
,
1947 const struct ieee80211_tx_info
*frame_txctl
,
1948 struct ieee80211_cts
*cts
)
1950 const struct ieee80211_hdr
*hdr
= frame
;
1953 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1954 cts
->frame_control
= cpu_to_le16(fctl
);
1955 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
1956 frame_len
, frame_txctl
);
1957 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1959 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1962 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
1963 struct ieee80211_vif
*vif
)
1965 struct ieee80211_local
*local
= hw_to_local(hw
);
1966 struct sk_buff
*skb
;
1967 struct sta_info
*sta
;
1968 ieee80211_tx_handler
*handler
;
1969 struct ieee80211_tx_data tx
;
1970 ieee80211_tx_result res
= TX_DROP
;
1971 struct net_device
*bdev
;
1972 struct ieee80211_sub_if_data
*sdata
;
1973 struct ieee80211_if_ap
*bss
= NULL
;
1974 struct beacon_data
*beacon
;
1975 struct ieee80211_tx_info
*info
;
1977 sdata
= vif_to_sdata(vif
);
1985 beacon
= rcu_dereference(bss
->beacon
);
1987 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
||
1993 if (bss
->dtim_count
!= 0)
1994 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1997 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2000 local
->total_ps_buffered
--;
2002 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2003 struct ieee80211_hdr
*hdr
=
2004 (struct ieee80211_hdr
*) skb
->data
;
2005 /* more buffered multicast/broadcast frames ==> set
2006 * MoreData flag in IEEE 802.11 header to inform PS
2008 hdr
->frame_control
|=
2009 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2012 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
))
2014 dev_kfree_skb_any(skb
);
2017 info
= IEEE80211_SKB_CB(skb
);
2020 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2021 tx
.channel
= local
->hw
.conf
.channel
;
2022 info
->band
= tx
.channel
->band
;
2024 for (handler
= ieee80211_tx_handlers
; *handler
!= NULL
; handler
++) {
2025 res
= (*handler
)(&tx
);
2026 if (res
== TX_DROP
|| res
== TX_QUEUED
)
2030 if (WARN_ON(tx
.skb
!= skb
))
2033 if (res
== TX_DROP
) {
2034 I802_DEBUG_INC(local
->tx_handlers_drop
);
2037 } else if (res
== TX_QUEUED
) {
2038 I802_DEBUG_INC(local
->tx_handlers_queued
);
2046 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);