2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
45 int rate
, mrate
, erp
, dur
, i
;
46 struct ieee80211_rate
*txrate
;
47 struct ieee80211_local
*local
= tx
->local
;
48 struct ieee80211_supported_band
*sband
;
49 struct ieee80211_hdr
*hdr
;
50 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
52 /* assume HW handles this */
53 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
57 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
60 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
61 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
63 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
83 if (ieee80211_is_ctl(hdr
->frame_control
)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr
) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate
= sband
->bitrates
[0].bitrate
;
121 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
122 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
124 if (r
->bitrate
> txrate
->bitrate
)
127 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
130 switch (sband
->band
) {
131 case IEEE80211_BAND_2GHZ
: {
133 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
134 flag
= IEEE80211_RATE_MANDATORY_G
;
136 flag
= IEEE80211_RATE_MANDATORY_B
;
141 case IEEE80211_BAND_5GHZ
:
142 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
161 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur
*= 2; /* ACK + SIFS */
168 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
169 txrate
->bitrate
, erp
,
170 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
173 return cpu_to_le16(dur
);
176 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
177 struct net_device
*dev
)
179 return local
== wdev_priv(dev
->ieee80211_ptr
);
184 static ieee80211_tx_result debug_noinline
185 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
188 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
189 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
192 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
195 if (unlikely(tx
->local
->sw_scanning
) &&
196 !ieee80211_is_probe_req(hdr
->frame_control
) &&
197 !ieee80211_is_nullfunc(hdr
->frame_control
))
199 * When software scanning only nullfunc frames (to notify
200 * the sleep state to the AP) and probe requests (for the
201 * active scan) are allowed, all other frames should not be
202 * sent and we should not get here, but if we do
203 * nonetheless, drop them to avoid sending them
204 * off-channel. See the link below and
205 * ieee80211_start_scan() for more.
207 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
211 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
214 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
217 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
219 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
220 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
221 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
222 ieee80211_is_data(hdr
->frame_control
))) {
223 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
224 printk(KERN_DEBUG
"%s: dropped data frame to not "
225 "associated station %pM\n",
226 tx
->dev
->name
, hdr
->addr1
);
227 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
228 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
232 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
233 tx
->local
->num_sta
== 0 &&
234 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
236 * No associated STAs - no need to send multicast
247 /* This function is called whenever the AP is about to exceed the maximum limit
248 * of buffered frames for power saving STAs. This situation should not really
249 * happen often during normal operation, so dropping the oldest buffered packet
250 * from each queue should be OK to make some room for new frames. */
251 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
253 int total
= 0, purged
= 0;
255 struct ieee80211_sub_if_data
*sdata
;
256 struct sta_info
*sta
;
259 * virtual interfaces are protected by RCU
263 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
264 struct ieee80211_if_ap
*ap
;
265 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
268 skb
= skb_dequeue(&ap
->ps_bc_buf
);
273 total
+= skb_queue_len(&ap
->ps_bc_buf
);
276 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
277 skb
= skb_dequeue(&sta
->ps_tx_buf
);
282 total
+= skb_queue_len(&sta
->ps_tx_buf
);
287 local
->total_ps_buffered
= total
;
288 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
289 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
290 wiphy_name(local
->hw
.wiphy
), purged
);
294 static ieee80211_tx_result
295 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
297 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
298 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
301 * broadcast/multicast frame
303 * If any of the associated stations is in power save mode,
304 * the frame is buffered to be sent after DTIM beacon frame.
305 * This is done either by the hardware or us.
308 /* powersaving STAs only in AP/VLAN mode */
312 /* no buffering for ordered frames */
313 if (ieee80211_has_order(hdr
->frame_control
))
316 /* no stations in PS mode */
317 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
320 /* buffered in mac80211 */
321 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
322 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
323 purge_old_ps_buffers(tx
->local
);
324 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
326 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
327 if (net_ratelimit()) {
328 printk(KERN_DEBUG
"%s: BC TX buffer full - "
329 "dropping the oldest frame\n",
333 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
335 tx
->local
->total_ps_buffered
++;
336 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
340 /* buffered in hardware */
341 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
346 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
349 if (!ieee80211_is_mgmt(fc
))
352 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
355 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
362 static ieee80211_tx_result
363 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
365 struct sta_info
*sta
= tx
->sta
;
366 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
367 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
370 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
373 staflags
= get_sta_flags(sta
);
375 if (unlikely((staflags
& WLAN_STA_PS
) &&
376 !(staflags
& WLAN_STA_PSPOLL
))) {
377 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
378 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
380 sta
->sta
.addr
, sta
->sta
.aid
,
381 skb_queue_len(&sta
->ps_tx_buf
));
382 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
383 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
384 purge_old_ps_buffers(tx
->local
);
385 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
386 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
387 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
388 if (net_ratelimit()) {
389 printk(KERN_DEBUG
"%s: STA %pM TX "
390 "buffer full - dropping oldest frame\n",
391 tx
->dev
->name
, sta
->sta
.addr
);
396 tx
->local
->total_ps_buffered
++;
398 /* Queue frame to be sent after STA sends an PS Poll frame */
399 if (skb_queue_empty(&sta
->ps_tx_buf
))
400 sta_info_set_tim_bit(sta
);
402 info
->control
.jiffies
= jiffies
;
403 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
406 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
407 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
408 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
409 "set -> send frame\n", tx
->dev
->name
,
412 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
413 if (test_and_clear_sta_flags(sta
, WLAN_STA_PSPOLL
)) {
415 * The sleeping station with pending data is now snoozing.
416 * It queried us for its buffered frames and will go back
417 * to deep sleep once it got everything.
419 * inform the driver, in case the hardware does powersave
420 * frame filtering and keeps a station blacklist on its own
421 * (e.g: p54), so that frames can be delivered unimpeded.
423 * Note: It should be save to disable the filter now.
424 * As, it is really unlikely that we still have any pending
425 * frame for this station in the hw's buffers/fifos left,
426 * that is not rejected with a unsuccessful tx_status yet.
429 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
434 static ieee80211_tx_result debug_noinline
435 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
437 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
440 if (tx
->flags
& IEEE80211_TX_UNICAST
)
441 return ieee80211_tx_h_unicast_ps_buf(tx
);
443 return ieee80211_tx_h_multicast_ps_buf(tx
);
446 static ieee80211_tx_result debug_noinline
447 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
449 struct ieee80211_key
*key
= NULL
;
450 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
451 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
453 if (unlikely(tx
->skb
->do_not_encrypt
))
455 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
457 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
458 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
460 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
462 else if (tx
->sdata
->drop_unencrypted
&&
463 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
464 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
465 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
466 (ieee80211_is_action(hdr
->frame_control
) &&
467 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
468 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
474 tx
->key
->tx_rx_count
++;
475 /* TODO: add threshold stuff again */
477 switch (tx
->key
->conf
.alg
) {
479 if (ieee80211_is_auth(hdr
->frame_control
))
482 if (!ieee80211_is_data_present(hdr
->frame_control
))
486 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
487 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
492 if (!ieee80211_is_mgmt(hdr
->frame_control
))
498 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
499 tx
->skb
->do_not_encrypt
= 1;
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
507 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
508 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
509 struct ieee80211_supported_band
*sband
;
510 struct ieee80211_rate
*rate
;
512 bool inval
= false, rts
= false, short_preamble
= false;
513 struct ieee80211_tx_rate_control txrc
;
515 memset(&txrc
, 0, sizeof(txrc
));
517 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
519 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
520 tx
->local
->hw
.wiphy
->frag_threshold
);
522 /* set up the tx rate control struct we give the RC algo */
523 txrc
.hw
= local_to_hw(tx
->local
);
525 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
527 txrc
.reported_rate
.idx
= -1;
528 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
530 /* set up RTS protection if desired */
531 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
532 txrc
.rts
= rts
= true;
536 * Use short preamble if the BSS can handle it, but not for
537 * management frames unless we know the receiver can handle
538 * that -- the management frame might be to a station that
539 * just wants a probe response.
541 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
542 (ieee80211_is_data(hdr
->frame_control
) ||
543 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
544 txrc
.short_preamble
= short_preamble
= true;
547 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
549 if (unlikely(info
->control
.rates
[0].idx
< 0))
552 if (txrc
.reported_rate
.idx
< 0)
553 txrc
.reported_rate
= info
->control
.rates
[0];
556 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
558 if (unlikely(!info
->control
.rates
[0].count
))
559 info
->control
.rates
[0].count
= 1;
561 if (is_multicast_ether_addr(hdr
->addr1
)) {
563 * XXX: verify the rate is in the basic rateset
569 * set up the RTS/CTS rate as the fastest basic rate
570 * that is not faster than the data rate
572 * XXX: Should this check all retry rates?
574 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
577 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
579 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
580 /* must be a basic rate */
581 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
583 /* must not be faster than the data rate */
584 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
587 if (sband
->bitrates
[baserate
].bitrate
<
588 sband
->bitrates
[i
].bitrate
)
592 info
->control
.rts_cts_rate_idx
= baserate
;
595 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
597 * make sure there's no valid rate following
598 * an invalid one, just in case drivers don't
599 * take the API seriously to stop at -1.
602 info
->control
.rates
[i
].idx
= -1;
605 if (info
->control
.rates
[i
].idx
< 0) {
611 * For now assume MCS is already set up correctly, this
614 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
615 WARN_ON(info
->control
.rates
[i
].idx
> 76);
619 /* set up RTS protection if desired */
621 info
->control
.rates
[i
].flags
|=
622 IEEE80211_TX_RC_USE_RTS_CTS
;
625 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
626 sband
->n_bitrates
)) {
627 info
->control
.rates
[i
].idx
= -1;
631 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
633 /* set up short preamble */
634 if (short_preamble
&&
635 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
636 info
->control
.rates
[i
].flags
|=
637 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
639 /* set up G protection */
640 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
641 rate
->flags
& IEEE80211_RATE_ERP_G
)
642 info
->control
.rates
[i
].flags
|=
643 IEEE80211_TX_RC_USE_CTS_PROTECT
;
649 static ieee80211_tx_result debug_noinline
650 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
652 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
655 info
->control
.sta
= &tx
->sta
->sta
;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
663 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
664 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
670 * Packet injection may want to control the sequence
671 * number, if we have no matching interface then we
672 * neither assign one ourselves nor ask the driver to.
674 if (unlikely(!info
->control
.vif
))
677 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
680 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
684 * Anything but QoS data that has a sequence number field
685 * (is long enough) gets a sequence number from the global
688 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
689 /* driver should assign sequence number */
690 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
691 /* for pure STA mode without beacons, we can do it */
692 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
693 tx
->sdata
->sequence_number
+= 0x10;
694 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
699 * This should be true for injected/management frames only, for
700 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
701 * above since they are not QoS-data frames.
706 /* include per-STA, per-TID sequence counter */
708 qc
= ieee80211_get_qos_ctl(hdr
);
709 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
710 seq
= &tx
->sta
->tid_seq
[tid
];
712 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
714 /* Increase the sequence number. */
715 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
720 static int ieee80211_fragment(struct ieee80211_local
*local
,
721 struct sk_buff
*skb
, int hdrlen
,
724 struct sk_buff
*tail
= skb
, *tmp
;
725 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
726 int pos
= hdrlen
+ per_fragm
;
727 int rem
= skb
->len
- hdrlen
- per_fragm
;
729 if (WARN_ON(rem
< 0))
733 int fraglen
= per_fragm
;
738 tmp
= dev_alloc_skb(local
->tx_headroom
+
740 IEEE80211_ENCRYPT_HEADROOM
+
741 IEEE80211_ENCRYPT_TAILROOM
);
746 skb_reserve(tmp
, local
->tx_headroom
+
747 IEEE80211_ENCRYPT_HEADROOM
);
748 /* copy control information */
749 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
750 skb_copy_queue_mapping(tmp
, skb
);
751 tmp
->priority
= skb
->priority
;
752 tmp
->do_not_encrypt
= skb
->do_not_encrypt
;
756 /* copy header and data */
757 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
758 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
763 skb
->len
= hdrlen
+ per_fragm
;
767 static ieee80211_tx_result debug_noinline
768 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
770 struct sk_buff
*skb
= tx
->skb
;
771 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
772 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
773 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
777 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
781 * Warn when submitting a fragmented A-MPDU frame and drop it.
782 * This scenario is handled in __ieee80211_tx_prepare but extra
783 * caution taken here as fragmented ampdu may cause Tx stop.
785 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
788 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
790 /* internal error, why is TX_FRAGMENTED set? */
791 if (WARN_ON(skb
->len
<= frag_threshold
))
795 * Now fragment the frame. This will allocate all the fragments and
796 * chain them (using skb as the first fragment) to skb->next.
797 * During transmission, we will remove the successfully transmitted
798 * fragments from this list. When the low-level driver rejects one
799 * of the fragments then we will simply pretend to accept the skb
800 * but store it away as pending.
802 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
805 /* update duration/seq/flags of fragments */
809 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
811 hdr
= (void *)skb
->data
;
812 info
= IEEE80211_SKB_CB(skb
);
815 hdr
->frame_control
|= morefrags
;
816 next_len
= skb
->next
->len
;
818 * No multi-rate retries for fragmented frames, that
819 * would completely throw off the NAV at other STAs.
821 info
->control
.rates
[1].idx
= -1;
822 info
->control
.rates
[2].idx
= -1;
823 info
->control
.rates
[3].idx
= -1;
824 info
->control
.rates
[4].idx
= -1;
825 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
826 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
828 hdr
->frame_control
&= ~morefrags
;
831 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
832 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
834 } while ((skb
= skb
->next
));
839 static ieee80211_tx_result debug_noinline
840 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
845 switch (tx
->key
->conf
.alg
) {
847 return ieee80211_crypto_wep_encrypt(tx
);
849 return ieee80211_crypto_tkip_encrypt(tx
);
851 return ieee80211_crypto_ccmp_encrypt(tx
);
853 return ieee80211_crypto_aes_cmac_encrypt(tx
);
861 static ieee80211_tx_result debug_noinline
862 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
864 struct sk_buff
*skb
= tx
->skb
;
865 struct ieee80211_hdr
*hdr
;
870 hdr
= (void *) skb
->data
;
871 next_len
= skb
->next
? skb
->next
->len
: 0;
872 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
875 ieee80211_duration(tx
, group_addr
, next_len
);
876 } while ((skb
= skb
->next
));
881 static ieee80211_tx_result debug_noinline
882 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
884 struct sk_buff
*skb
= tx
->skb
;
889 tx
->sta
->tx_packets
++;
891 tx
->sta
->tx_fragments
++;
892 tx
->sta
->tx_bytes
+= skb
->len
;
893 } while ((skb
= skb
->next
));
898 /* actual transmit path */
901 * deal with packet injection down monitor interface
902 * with Radiotap Header -- only called for monitor mode interface
904 static ieee80211_tx_result
905 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
909 * this is the moment to interpret and discard the radiotap header that
910 * must be at the start of the packet injected in Monitor mode
912 * Need to take some care with endian-ness since radiotap
913 * args are little-endian
916 struct ieee80211_radiotap_iterator iterator
;
917 struct ieee80211_radiotap_header
*rthdr
=
918 (struct ieee80211_radiotap_header
*) skb
->data
;
919 struct ieee80211_supported_band
*sband
;
920 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
922 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
924 skb
->do_not_encrypt
= 1;
925 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
928 * for every radiotap entry that is present
929 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
930 * entries present, or -EINVAL on error)
934 ret
= ieee80211_radiotap_iterator_next(&iterator
);
939 /* see if this argument is something we can use */
940 switch (iterator
.this_arg_index
) {
942 * You must take care when dereferencing iterator.this_arg
943 * for multibyte types... the pointer is not aligned. Use
944 * get_unaligned((type *)iterator.this_arg) to dereference
945 * iterator.this_arg for type "type" safely on all arches.
947 case IEEE80211_RADIOTAP_FLAGS
:
948 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
950 * this indicates that the skb we have been
951 * handed has the 32-bit FCS CRC at the end...
952 * we should react to that by snipping it off
953 * because it will be recomputed and added
956 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
959 skb_trim(skb
, skb
->len
- FCS_LEN
);
961 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
962 tx
->skb
->do_not_encrypt
= 0;
963 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
964 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
968 * Please update the file
969 * Documentation/networking/mac80211-injection.txt
970 * when parsing new fields here.
978 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
982 * remove the radiotap header
983 * iterator->max_length was sanity-checked against
984 * skb->len by iterator init
986 skb_pull(skb
, iterator
.max_length
);
994 static ieee80211_tx_result
995 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
997 struct net_device
*dev
)
999 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1000 struct ieee80211_hdr
*hdr
;
1001 struct ieee80211_sub_if_data
*sdata
;
1002 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1005 bool queued
= false;
1007 memset(tx
, 0, sizeof(*tx
));
1009 tx
->dev
= dev
; /* use original interface */
1011 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1012 tx
->channel
= local
->hw
.conf
.channel
;
1014 * Set this flag (used below to indicate "automatic fragmentation"),
1015 * it will be cleared/left by radiotap as desired.
1017 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1019 /* process and remove the injection radiotap header */
1020 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1021 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1022 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1026 * __ieee80211_parse_tx_radiotap has now removed
1027 * the radiotap header that was present and pre-filled
1028 * 'tx' with tx control information.
1033 * If this flag is set to true anywhere, and we get here,
1034 * we are doing the needed processing, so remove the flag
1037 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1039 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1041 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1043 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1044 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1045 unsigned long flags
;
1046 struct tid_ampdu_tx
*tid_tx
;
1048 qc
= ieee80211_get_qos_ctl(hdr
);
1049 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1051 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1053 * XXX: This spinlock could be fairly expensive, but see the
1054 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1055 * One way to solve this would be to do something RCU-like
1056 * for managing the tid_tx struct and using atomic bitops
1057 * for the actual state -- by introducing an actual
1058 * 'operational' bit that would be possible. It would
1059 * require changing ieee80211_agg_tx_operational() to
1060 * set that bit, and changing the way tid_tx is managed
1061 * everywhere, including races between that bit and
1062 * tid_tx going away (tid_tx being added can be easily
1063 * committed to memory before the 'operational' bit).
1065 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1066 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1067 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1068 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1069 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1072 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1073 __skb_queue_tail(&tid_tx
->pending
, skb
);
1075 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1077 if (unlikely(queued
))
1081 if (is_multicast_ether_addr(hdr
->addr1
)) {
1082 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1083 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1085 tx
->flags
|= IEEE80211_TX_UNICAST
;
1086 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1089 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1090 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1091 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1092 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1093 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1095 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1099 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1100 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1101 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1103 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1104 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1105 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1106 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1108 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1114 * NB: @tx is uninitialised when passed in here
1116 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1117 struct ieee80211_tx_data
*tx
,
1118 struct sk_buff
*skb
)
1120 struct net_device
*dev
;
1122 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1123 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1130 * initialises tx with control
1132 * return value is safe to ignore here because this function
1133 * can only be invoked for multicast frames
1137 __ieee80211_tx_prepare(tx
, skb
, dev
);
1142 static int __ieee80211_tx(struct ieee80211_local
*local
,
1143 struct sk_buff
**skbp
,
1144 struct sta_info
*sta
)
1146 struct sk_buff
*skb
= *skbp
, *next
;
1147 struct ieee80211_tx_info
*info
;
1151 local
->mdev
->trans_start
= jiffies
;
1154 if (ieee80211_queue_stopped(&local
->hw
,
1155 skb_get_queue_mapping(skb
)))
1156 return IEEE80211_TX_PENDING
;
1158 info
= IEEE80211_SKB_CB(skb
);
1161 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1162 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1166 ret
= drv_tx(local
, skb
);
1167 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1171 if (ret
!= NETDEV_TX_OK
)
1172 return IEEE80211_TX_AGAIN
;
1174 ieee80211_led_tx(local
, 1);
1178 return IEEE80211_TX_OK
;
1182 * Invoke TX handlers, return 0 on success and non-zero if the
1183 * frame was dropped or queued.
1185 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1187 struct sk_buff
*skb
= tx
->skb
;
1188 ieee80211_tx_result res
= TX_DROP
;
1190 #define CALL_TXH(txh) \
1192 if (res != TX_CONTINUE) \
1195 CALL_TXH(ieee80211_tx_h_check_assoc
)
1196 CALL_TXH(ieee80211_tx_h_ps_buf
)
1197 CALL_TXH(ieee80211_tx_h_select_key
)
1198 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1199 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1200 CALL_TXH(ieee80211_tx_h_misc
)
1201 CALL_TXH(ieee80211_tx_h_sequence
)
1202 CALL_TXH(ieee80211_tx_h_fragment
)
1203 /* handlers after fragment must be aware of tx info fragmentation! */
1204 CALL_TXH(ieee80211_tx_h_encrypt
)
1205 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1206 CALL_TXH(ieee80211_tx_h_stats
)
1210 if (unlikely(res
== TX_DROP
)) {
1211 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1213 struct sk_buff
*next
;
1220 } else if (unlikely(res
== TX_QUEUED
)) {
1221 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1228 static void ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1231 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1232 struct sta_info
*sta
;
1233 struct ieee80211_tx_data tx
;
1234 ieee80211_tx_result res_prepare
;
1235 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1236 struct sk_buff
*next
;
1237 unsigned long flags
;
1241 queue
= skb_get_queue_mapping(skb
);
1243 WARN_ON(!txpending
&& !skb_queue_empty(&local
->pending
[queue
]));
1245 if (unlikely(skb
->len
< 10)) {
1252 /* initialises tx */
1253 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1255 if (unlikely(res_prepare
== TX_DROP
)) {
1259 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1265 tx
.channel
= local
->hw
.conf
.channel
;
1266 info
->band
= tx
.channel
->band
;
1268 if (invoke_tx_handlers(&tx
))
1273 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
);
1275 case IEEE80211_TX_OK
:
1277 case IEEE80211_TX_AGAIN
:
1279 * Since there are no fragmented frames on A-MPDU
1280 * queues, there's no reason for a driver to reject
1281 * a frame there, warn and drop it.
1283 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1286 case IEEE80211_TX_PENDING
:
1289 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1291 if (__netif_subqueue_stopped(local
->mdev
, queue
)) {
1295 if (unlikely(txpending
))
1296 skb_queue_head(&local
->pending
[queue
],
1299 skb_queue_tail(&local
->pending
[queue
],
1301 } while ((skb
= next
));
1304 * Make sure nobody will enable the queue on us
1305 * (without going through the tasklet) nor disable the
1306 * netdev queue underneath the pending handling code.
1308 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING
,
1309 &local
->queue_stop_reasons
[queue
]);
1311 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1314 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1318 if (WARN(retries
> 10, "tx refused but queue active"))
1338 /* device xmit handlers */
1340 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1341 struct sk_buff
*skb
,
1342 int head_need
, bool may_encrypt
)
1347 * This could be optimised, devices that do full hardware
1348 * crypto (including TKIP MMIC) need no tailroom... But we
1349 * have no drivers for such devices currently.
1352 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1353 tail_need
-= skb_tailroom(skb
);
1354 tail_need
= max_t(int, tail_need
, 0);
1357 if (head_need
|| tail_need
) {
1358 /* Sorry. Can't account for this any more */
1362 if (skb_header_cloned(skb
))
1363 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1365 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1367 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1368 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1369 wiphy_name(local
->hw
.wiphy
));
1373 /* update truesize too */
1374 skb
->truesize
+= head_need
+ tail_need
;
1379 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1381 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1382 struct ieee80211_local
*local
= mpriv
->local
;
1383 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1384 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1385 struct net_device
*odev
= NULL
;
1386 struct ieee80211_sub_if_data
*osdata
;
1393 } monitor_iface
= NOT_MONITOR
;
1396 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1397 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1401 if (unlikely(!odev
)) {
1402 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1403 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1404 "originating device\n", dev
->name
);
1407 return NETDEV_TX_OK
;
1410 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1411 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1412 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1413 ieee80211_stop_queues_by_reason(&local
->hw
,
1414 IEEE80211_QUEUE_STOP_REASON_PS
);
1415 queue_work(local
->hw
.workqueue
,
1416 &local
->dynamic_ps_disable_work
);
1419 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1420 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1423 memset(info
, 0, sizeof(*info
));
1425 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1427 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1429 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1430 ieee80211_is_data(hdr
->frame_control
)) {
1431 if (is_multicast_ether_addr(hdr
->addr3
))
1432 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1434 if (mesh_nexthop_lookup(skb
, osdata
)) {
1436 return NETDEV_TX_OK
;
1438 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1439 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1441 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1442 struct ieee80211_sub_if_data
*sdata
;
1446 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1447 monitor_iface
= UNKNOWN_ADDRESS
;
1449 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1450 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1451 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1453 /* check the header is complete in the frame */
1454 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1456 * We process outgoing injected frames that have a
1457 * local address we handle as though they are our
1459 * This code here isn't entirely correct, the local
1460 * MAC address is not necessarily enough to find
1461 * the interface to use; for that proper VLAN/WDS
1462 * support we will need a different mechanism.
1466 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1468 if (!netif_running(sdata
->dev
))
1470 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1472 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1474 dev_hold(sdata
->dev
);
1478 skb
->iif
= sdata
->dev
->ifindex
;
1479 monitor_iface
= FOUND_SDATA
;
1487 may_encrypt
= !skb
->do_not_encrypt
;
1489 headroom
= osdata
->local
->tx_headroom
;
1491 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1492 headroom
-= skb_headroom(skb
);
1493 headroom
= max_t(int, 0, headroom
);
1495 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1498 return NETDEV_TX_OK
;
1501 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1502 osdata
= container_of(osdata
->bss
,
1503 struct ieee80211_sub_if_data
,
1505 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1506 info
->control
.vif
= &osdata
->vif
;
1508 ieee80211_tx(odev
, skb
, false);
1511 return NETDEV_TX_OK
;
1514 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1515 struct net_device
*dev
)
1517 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1518 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1519 struct ieee80211_radiotap_header
*prthdr
=
1520 (struct ieee80211_radiotap_header
*)skb
->data
;
1524 * Frame injection is not allowed if beaconing is not allowed
1525 * or if we need radar detection. Beaconing is usually not allowed when
1526 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1527 * Passive scan is also used in world regulatory domains where
1528 * your country is not known and as such it should be treated as
1529 * NO TX unless the channel is explicitly allowed in which case
1530 * your current regulatory domain would not have the passive scan
1533 * Since AP mode uses monitor interfaces to inject/TX management
1534 * frames we can make AP mode the exception to this rule once it
1535 * supports radar detection as its implementation can deal with
1536 * radar detection by itself. We can do that later by adding a
1537 * monitor flag interfaces used for AP support.
1539 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1540 IEEE80211_CHAN_PASSIVE_SCAN
)))
1543 /* check for not even having the fixed radiotap header part */
1544 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1545 goto fail
; /* too short to be possibly valid */
1547 /* is it a header version we can trust to find length from? */
1548 if (unlikely(prthdr
->it_version
))
1549 goto fail
; /* only version 0 is supported */
1551 /* then there must be a radiotap header with a length we can use */
1552 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1554 /* does the skb contain enough to deliver on the alleged length? */
1555 if (unlikely(skb
->len
< len_rthdr
))
1556 goto fail
; /* skb too short for claimed rt header extent */
1558 skb
->dev
= local
->mdev
;
1560 /* needed because we set skb device to master */
1561 skb
->iif
= dev
->ifindex
;
1563 /* sometimes we do encrypt injected frames, will be fixed
1564 * up in radiotap parser if not wanted */
1565 skb
->do_not_encrypt
= 0;
1568 * fix up the pointers accounting for the radiotap
1569 * header still being in there. We are being given
1570 * a precooked IEEE80211 header so no need for
1573 skb_set_mac_header(skb
, len_rthdr
);
1575 * these are just fixed to the end of the rt area since we
1576 * don't have any better information and at this point, nobody cares
1578 skb_set_network_header(skb
, len_rthdr
);
1579 skb_set_transport_header(skb
, len_rthdr
);
1581 /* pass the radiotap header up to the next stage intact */
1582 dev_queue_xmit(skb
);
1583 return NETDEV_TX_OK
;
1587 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1591 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1592 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1593 * @skb: packet to be sent
1594 * @dev: incoming interface
1596 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1597 * not be freed, and caller is responsible for either retrying later or freeing
1600 * This function takes in an Ethernet header and encapsulates it with suitable
1601 * IEEE 802.11 header based on which interface the packet is coming in. The
1602 * encapsulated packet will then be passed to master interface, wlan#.11, for
1603 * transmission (through low-level driver).
1605 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1606 struct net_device
*dev
)
1608 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1609 struct ieee80211_local
*local
= sdata
->local
;
1610 int ret
= 1, head_need
;
1611 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1613 struct ieee80211_hdr hdr
;
1614 struct ieee80211s_hdr mesh_hdr
;
1615 const u8
*encaps_data
;
1616 int encaps_len
, skip_header_bytes
;
1618 struct sta_info
*sta
;
1621 if (unlikely(skb
->len
< ETH_HLEN
)) {
1626 nh_pos
= skb_network_header(skb
) - skb
->data
;
1627 h_pos
= skb_transport_header(skb
) - skb
->data
;
1629 /* convert Ethernet header to proper 802.11 header (based on
1630 * operation mode) */
1631 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1632 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1634 switch (sdata
->vif
.type
) {
1635 case NL80211_IFTYPE_AP
:
1636 case NL80211_IFTYPE_AP_VLAN
:
1637 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1639 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1640 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1641 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1644 case NL80211_IFTYPE_WDS
:
1645 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1647 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1648 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1649 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1650 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1653 #ifdef CONFIG_MAC80211_MESH
1654 case NL80211_IFTYPE_MESH_POINT
:
1655 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1656 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1657 /* Do not send frames with mesh_ttl == 0 */
1658 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1662 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1664 if (compare_ether_addr(dev
->dev_addr
,
1665 skb
->data
+ ETH_ALEN
) == 0) {
1667 memset(hdr
.addr1
, 0, ETH_ALEN
);
1668 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1669 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1670 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1671 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1673 /* packet from other interface */
1674 struct mesh_path
*mppath
;
1676 memset(hdr
.addr1
, 0, ETH_ALEN
);
1677 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1678 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1680 if (is_multicast_ether_addr(skb
->data
))
1681 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1684 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1686 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1688 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1692 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1693 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1694 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1695 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1696 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1697 sdata
->u
.mesh
.mesh_seqnum
++;
1703 case NL80211_IFTYPE_STATION
:
1704 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1706 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1707 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1708 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1711 case NL80211_IFTYPE_ADHOC
:
1713 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1714 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1715 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1724 * There's no need to try to look up the destination
1725 * if it is a multicast address (which can only happen
1728 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1730 sta
= sta_info_get(local
, hdr
.addr1
);
1732 sta_flags
= get_sta_flags(sta
);
1736 /* receiver and we are QoS enabled, use a QoS type frame */
1737 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1738 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1743 * Drop unicast frames to unauthorised stations unless they are
1744 * EAPOL frames from the local station.
1746 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1747 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1748 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1749 !(ethertype
== ETH_P_PAE
&&
1750 compare_ether_addr(dev
->dev_addr
,
1751 skb
->data
+ ETH_ALEN
) == 0))) {
1752 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1753 if (net_ratelimit())
1754 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1755 " (unauthorized port)\n", dev
->name
,
1759 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1765 hdr
.frame_control
= fc
;
1766 hdr
.duration_id
= 0;
1769 skip_header_bytes
= ETH_HLEN
;
1770 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1771 encaps_data
= bridge_tunnel_header
;
1772 encaps_len
= sizeof(bridge_tunnel_header
);
1773 skip_header_bytes
-= 2;
1774 } else if (ethertype
>= 0x600) {
1775 encaps_data
= rfc1042_header
;
1776 encaps_len
= sizeof(rfc1042_header
);
1777 skip_header_bytes
-= 2;
1783 skb_pull(skb
, skip_header_bytes
);
1784 nh_pos
-= skip_header_bytes
;
1785 h_pos
-= skip_header_bytes
;
1787 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1790 * So we need to modify the skb header and hence need a copy of
1791 * that. The head_need variable above doesn't, so far, include
1792 * the needed header space that we don't need right away. If we
1793 * can, then we don't reallocate right now but only after the
1794 * frame arrives at the master device (if it does...)
1796 * If we cannot, however, then we will reallocate to include all
1797 * the ever needed space. Also, if we need to reallocate it anyway,
1798 * make it big enough for everything we may ever need.
1801 if (head_need
> 0 || skb_cloned(skb
)) {
1802 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1803 head_need
+= local
->tx_headroom
;
1804 head_need
= max_t(int, 0, head_need
);
1805 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1810 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1811 nh_pos
+= encaps_len
;
1812 h_pos
+= encaps_len
;
1815 if (meshhdrlen
> 0) {
1816 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1817 nh_pos
+= meshhdrlen
;
1818 h_pos
+= meshhdrlen
;
1821 if (ieee80211_is_data_qos(fc
)) {
1822 __le16
*qos_control
;
1824 qos_control
= (__le16
*) skb_push(skb
, 2);
1825 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1827 * Maybe we could actually set some fields here, for now just
1828 * initialise to zero to indicate no special operation.
1832 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1837 skb
->iif
= dev
->ifindex
;
1839 skb
->dev
= local
->mdev
;
1840 dev
->stats
.tx_packets
++;
1841 dev
->stats
.tx_bytes
+= skb
->len
;
1843 /* Update skb pointers to various headers since this modified frame
1844 * is going to go through Linux networking code that may potentially
1845 * need things like pointer to IP header. */
1846 skb_set_mac_header(skb
, 0);
1847 skb_set_network_header(skb
, nh_pos
);
1848 skb_set_transport_header(skb
, h_pos
);
1850 dev
->trans_start
= jiffies
;
1851 dev_queue_xmit(skb
);
1864 * ieee80211_clear_tx_pending may not be called in a context where
1865 * it is possible that it packets could come in again.
1867 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1871 for (i
= 0; i
< local
->hw
.queues
; i
++)
1872 skb_queue_purge(&local
->pending
[i
]);
1875 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1876 struct sk_buff
*skb
)
1878 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1879 struct ieee80211_sub_if_data
*sdata
;
1880 struct sta_info
*sta
;
1881 struct ieee80211_hdr
*hdr
;
1882 struct net_device
*dev
;
1886 /* does interface still exist? */
1887 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1893 /* validate info->control.vif against skb->iif */
1894 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1895 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1896 sdata
= container_of(sdata
->bss
,
1897 struct ieee80211_sub_if_data
,
1900 if (unlikely(info
->control
.vif
&& info
->control
.vif
!= &sdata
->vif
)) {
1906 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1907 ieee80211_tx(dev
, skb
, true);
1909 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1910 sta
= sta_info_get(local
, hdr
->addr1
);
1912 ret
= __ieee80211_tx(local
, &skb
, sta
);
1913 if (ret
!= IEEE80211_TX_OK
)
1924 * Transmit all pending packets. Called from tasklet, locks master device
1925 * TX lock so that no new packets can come in.
1927 void ieee80211_tx_pending(unsigned long data
)
1929 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1930 struct net_device
*dev
= local
->mdev
;
1931 unsigned long flags
;
1936 netif_tx_lock_bh(dev
);
1938 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1940 * If queue is stopped by something other than due to pending
1941 * frames, or we have no pending frames, proceed to next queue.
1943 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1945 if (local
->queue_stop_reasons
[i
] !=
1946 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING
) ||
1947 skb_queue_empty(&local
->pending
[i
]))
1949 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1955 * start the queue now to allow processing our packets,
1956 * we're under the tx lock here anyway so nothing will
1957 * happen as a result of this
1959 netif_start_subqueue(local
->mdev
, i
);
1961 while (!skb_queue_empty(&local
->pending
[i
])) {
1962 struct sk_buff
*skb
= skb_dequeue(&local
->pending
[i
]);
1964 if (!ieee80211_tx_pending_skb(local
, skb
)) {
1965 skb_queue_head(&local
->pending
[i
], skb
);
1970 /* Start regular packet processing again. */
1971 if (skb_queue_empty(&local
->pending
[i
]))
1972 ieee80211_wake_queue_by_reason(&local
->hw
, i
,
1973 IEEE80211_QUEUE_STOP_REASON_PENDING
);
1976 netif_tx_unlock_bh(dev
);
1980 /* functions for drivers to get certain frames */
1982 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1983 struct sk_buff
*skb
,
1984 struct beacon_data
*beacon
)
1988 int i
, have_bits
= 0, n1
, n2
;
1990 /* Generate bitmap for TIM only if there are any STAs in power save
1992 if (atomic_read(&bss
->num_sta_ps
) > 0)
1993 /* in the hope that this is faster than
1994 * checking byte-for-byte */
1995 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1996 IEEE80211_MAX_AID
+1);
1998 if (bss
->dtim_count
== 0)
1999 bss
->dtim_count
= beacon
->dtim_period
- 1;
2003 tim
= pos
= (u8
*) skb_put(skb
, 6);
2004 *pos
++ = WLAN_EID_TIM
;
2006 *pos
++ = bss
->dtim_count
;
2007 *pos
++ = beacon
->dtim_period
;
2009 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2013 /* Find largest even number N1 so that bits numbered 1 through
2014 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2015 * (N2 + 1) x 8 through 2007 are 0. */
2017 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2024 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2031 /* Bitmap control */
2033 /* Part Virt Bitmap */
2034 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2036 tim
[1] = n2
- n1
+ 4;
2037 skb_put(skb
, n2
- n1
);
2039 *pos
++ = aid0
; /* Bitmap control */
2040 *pos
++ = 0; /* Part Virt Bitmap */
2044 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
2045 struct ieee80211_vif
*vif
)
2047 struct ieee80211_local
*local
= hw_to_local(hw
);
2048 struct sk_buff
*skb
= NULL
;
2049 struct ieee80211_tx_info
*info
;
2050 struct ieee80211_sub_if_data
*sdata
= NULL
;
2051 struct ieee80211_if_ap
*ap
= NULL
;
2052 struct beacon_data
*beacon
;
2053 struct ieee80211_supported_band
*sband
;
2054 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2056 sband
= local
->hw
.wiphy
->bands
[band
];
2060 sdata
= vif_to_sdata(vif
);
2062 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2064 beacon
= rcu_dereference(ap
->beacon
);
2067 * headroom, head length,
2068 * tail length and maximum TIM length
2070 skb
= dev_alloc_skb(local
->tx_headroom
+
2072 beacon
->tail_len
+ 256);
2076 skb_reserve(skb
, local
->tx_headroom
);
2077 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2081 * Not very nice, but we want to allow the driver to call
2082 * ieee80211_beacon_get() as a response to the set_tim()
2083 * callback. That, however, is already invoked under the
2084 * sta_lock to guarantee consistent and race-free update
2085 * of the tim bitmap in mac80211 and the driver.
2087 if (local
->tim_in_locked_section
) {
2088 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2090 unsigned long flags
;
2092 spin_lock_irqsave(&local
->sta_lock
, flags
);
2093 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2094 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2098 memcpy(skb_put(skb
, beacon
->tail_len
),
2099 beacon
->tail
, beacon
->tail_len
);
2102 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2103 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2104 struct ieee80211_hdr
*hdr
;
2105 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2110 skb
= skb_copy(presp
, GFP_ATOMIC
);
2114 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2115 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2116 IEEE80211_STYPE_BEACON
);
2117 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2118 struct ieee80211_mgmt
*mgmt
;
2121 /* headroom, head length, tail length and maximum TIM length */
2122 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2126 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2127 mgmt
= (struct ieee80211_mgmt
*)
2128 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2129 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2130 mgmt
->frame_control
=
2131 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2132 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2133 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2134 /* BSSID is left zeroed, wildcard value */
2135 mgmt
->u
.beacon
.beacon_int
=
2136 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2137 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2139 pos
= skb_put(skb
, 2);
2140 *pos
++ = WLAN_EID_SSID
;
2143 mesh_mgmt_ies_add(skb
, sdata
);
2149 info
= IEEE80211_SKB_CB(skb
);
2151 skb
->do_not_encrypt
= 1;
2155 * XXX: For now, always use the lowest rate
2157 info
->control
.rates
[0].idx
= 0;
2158 info
->control
.rates
[0].count
= 1;
2159 info
->control
.rates
[1].idx
= -1;
2160 info
->control
.rates
[2].idx
= -1;
2161 info
->control
.rates
[3].idx
= -1;
2162 info
->control
.rates
[4].idx
= -1;
2163 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2165 info
->control
.vif
= vif
;
2167 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2168 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2169 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2174 EXPORT_SYMBOL(ieee80211_beacon_get
);
2176 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2177 const void *frame
, size_t frame_len
,
2178 const struct ieee80211_tx_info
*frame_txctl
,
2179 struct ieee80211_rts
*rts
)
2181 const struct ieee80211_hdr
*hdr
= frame
;
2183 rts
->frame_control
=
2184 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2185 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2187 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2188 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2190 EXPORT_SYMBOL(ieee80211_rts_get
);
2192 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2193 const void *frame
, size_t frame_len
,
2194 const struct ieee80211_tx_info
*frame_txctl
,
2195 struct ieee80211_cts
*cts
)
2197 const struct ieee80211_hdr
*hdr
= frame
;
2199 cts
->frame_control
=
2200 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2201 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2202 frame_len
, frame_txctl
);
2203 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2205 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2208 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2209 struct ieee80211_vif
*vif
)
2211 struct ieee80211_local
*local
= hw_to_local(hw
);
2212 struct sk_buff
*skb
= NULL
;
2213 struct sta_info
*sta
;
2214 struct ieee80211_tx_data tx
;
2215 struct ieee80211_sub_if_data
*sdata
;
2216 struct ieee80211_if_ap
*bss
= NULL
;
2217 struct beacon_data
*beacon
;
2218 struct ieee80211_tx_info
*info
;
2220 sdata
= vif_to_sdata(vif
);
2227 beacon
= rcu_dereference(bss
->beacon
);
2229 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2232 if (bss
->dtim_count
!= 0)
2233 goto out
; /* send buffered bc/mc only after DTIM beacon */
2236 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2239 local
->total_ps_buffered
--;
2241 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2242 struct ieee80211_hdr
*hdr
=
2243 (struct ieee80211_hdr
*) skb
->data
;
2244 /* more buffered multicast/broadcast frames ==> set
2245 * MoreData flag in IEEE 802.11 header to inform PS
2247 hdr
->frame_control
|=
2248 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2251 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2253 dev_kfree_skb_any(skb
);
2256 info
= IEEE80211_SKB_CB(skb
);
2259 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2260 tx
.channel
= local
->hw
.conf
.channel
;
2261 info
->band
= tx
.channel
->band
;
2263 if (invoke_tx_handlers(&tx
))
2270 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);