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(test_bit(SCAN_SW_SCANNING
, &tx
->local
->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 info
->control
.vif
= &tx
->sdata
->vif
;
404 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
405 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
408 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
409 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
410 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
411 "set -> send frame\n", tx
->dev
->name
,
414 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
415 if (test_and_clear_sta_flags(sta
, WLAN_STA_PSPOLL
)) {
417 * The sleeping station with pending data is now snoozing.
418 * It queried us for its buffered frames and will go back
419 * to deep sleep once it got everything.
421 * inform the driver, in case the hardware does powersave
422 * frame filtering and keeps a station blacklist on its own
423 * (e.g: p54), so that frames can be delivered unimpeded.
425 * Note: It should be safe to disable the filter now.
426 * As, it is really unlikely that we still have any pending
427 * frame for this station in the hw's buffers/fifos left,
428 * that is not rejected with a unsuccessful tx_status yet.
431 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
436 static ieee80211_tx_result debug_noinline
437 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
439 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
442 if (tx
->flags
& IEEE80211_TX_UNICAST
)
443 return ieee80211_tx_h_unicast_ps_buf(tx
);
445 return ieee80211_tx_h_multicast_ps_buf(tx
);
448 static ieee80211_tx_result debug_noinline
449 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
451 struct ieee80211_key
*key
= NULL
;
452 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
453 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
455 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
457 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
459 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
460 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
462 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
464 else if (tx
->sdata
->drop_unencrypted
&&
465 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
466 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
467 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
468 (ieee80211_is_action(hdr
->frame_control
) &&
469 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
470 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
476 tx
->key
->tx_rx_count
++;
477 /* TODO: add threshold stuff again */
479 switch (tx
->key
->conf
.alg
) {
481 if (ieee80211_is_auth(hdr
->frame_control
))
484 if (!ieee80211_is_data_present(hdr
->frame_control
))
488 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
489 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
494 if (!ieee80211_is_mgmt(hdr
->frame_control
))
500 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
501 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
506 static ieee80211_tx_result debug_noinline
507 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
509 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
510 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
511 struct ieee80211_supported_band
*sband
;
512 struct ieee80211_rate
*rate
;
514 bool inval
= false, rts
= false, short_preamble
= false;
515 struct ieee80211_tx_rate_control txrc
;
518 memset(&txrc
, 0, sizeof(txrc
));
520 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
522 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
523 tx
->local
->hw
.wiphy
->frag_threshold
);
525 /* set up the tx rate control struct we give the RC algo */
526 txrc
.hw
= local_to_hw(tx
->local
);
528 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
530 txrc
.reported_rate
.idx
= -1;
531 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
533 /* set up RTS protection if desired */
534 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
535 txrc
.rts
= rts
= true;
539 * Use short preamble if the BSS can handle it, but not for
540 * management frames unless we know the receiver can handle
541 * that -- the management frame might be to a station that
542 * just wants a probe response.
544 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
545 (ieee80211_is_data(hdr
->frame_control
) ||
546 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
547 txrc
.short_preamble
= short_preamble
= true;
549 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
552 * Lets not bother rate control if we're associated and cannot
553 * talk to the sta. This should not happen.
555 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
556 (sta_flags
& WLAN_STA_ASSOC
) &&
557 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
558 "%s: Dropped data frame as no usable bitrate found while "
559 "scanning and associated. Target station: "
560 "%pM on %d GHz band\n",
561 tx
->dev
->name
, hdr
->addr1
,
562 tx
->channel
->band
? 5 : 2))
566 * If we're associated with the sta at this point we know we can at
567 * least send the frame at the lowest bit rate.
569 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
571 if (unlikely(info
->control
.rates
[0].idx
< 0))
574 if (txrc
.reported_rate
.idx
< 0)
575 txrc
.reported_rate
= info
->control
.rates
[0];
578 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
580 if (unlikely(!info
->control
.rates
[0].count
))
581 info
->control
.rates
[0].count
= 1;
583 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
584 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
585 info
->control
.rates
[0].count
= 1;
587 if (is_multicast_ether_addr(hdr
->addr1
)) {
589 * XXX: verify the rate is in the basic rateset
595 * set up the RTS/CTS rate as the fastest basic rate
596 * that is not faster than the data rate
598 * XXX: Should this check all retry rates?
600 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
603 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
605 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
606 /* must be a basic rate */
607 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
609 /* must not be faster than the data rate */
610 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
613 if (sband
->bitrates
[baserate
].bitrate
<
614 sband
->bitrates
[i
].bitrate
)
618 info
->control
.rts_cts_rate_idx
= baserate
;
621 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
623 * make sure there's no valid rate following
624 * an invalid one, just in case drivers don't
625 * take the API seriously to stop at -1.
628 info
->control
.rates
[i
].idx
= -1;
631 if (info
->control
.rates
[i
].idx
< 0) {
637 * For now assume MCS is already set up correctly, this
640 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
641 WARN_ON(info
->control
.rates
[i
].idx
> 76);
645 /* set up RTS protection if desired */
647 info
->control
.rates
[i
].flags
|=
648 IEEE80211_TX_RC_USE_RTS_CTS
;
651 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
652 sband
->n_bitrates
)) {
653 info
->control
.rates
[i
].idx
= -1;
657 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
659 /* set up short preamble */
660 if (short_preamble
&&
661 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
662 info
->control
.rates
[i
].flags
|=
663 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
665 /* set up G protection */
666 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
667 rate
->flags
& IEEE80211_RATE_ERP_G
)
668 info
->control
.rates
[i
].flags
|=
669 IEEE80211_TX_RC_USE_CTS_PROTECT
;
675 static ieee80211_tx_result debug_noinline
676 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
678 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
681 info
->control
.sta
= &tx
->sta
->sta
;
686 static ieee80211_tx_result debug_noinline
687 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
689 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
690 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
696 * Packet injection may want to control the sequence
697 * number, if we have no matching interface then we
698 * neither assign one ourselves nor ask the driver to.
700 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
703 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
706 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
710 * Anything but QoS data that has a sequence number field
711 * (is long enough) gets a sequence number from the global
714 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
715 /* driver should assign sequence number */
716 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
717 /* for pure STA mode without beacons, we can do it */
718 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
719 tx
->sdata
->sequence_number
+= 0x10;
720 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
725 * This should be true for injected/management frames only, for
726 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
727 * above since they are not QoS-data frames.
732 /* include per-STA, per-TID sequence counter */
734 qc
= ieee80211_get_qos_ctl(hdr
);
735 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
736 seq
= &tx
->sta
->tid_seq
[tid
];
738 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
740 /* Increase the sequence number. */
741 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
746 static int ieee80211_fragment(struct ieee80211_local
*local
,
747 struct sk_buff
*skb
, int hdrlen
,
750 struct sk_buff
*tail
= skb
, *tmp
;
751 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
752 int pos
= hdrlen
+ per_fragm
;
753 int rem
= skb
->len
- hdrlen
- per_fragm
;
755 if (WARN_ON(rem
< 0))
759 int fraglen
= per_fragm
;
764 tmp
= dev_alloc_skb(local
->tx_headroom
+
766 IEEE80211_ENCRYPT_HEADROOM
+
767 IEEE80211_ENCRYPT_TAILROOM
);
772 skb_reserve(tmp
, local
->tx_headroom
+
773 IEEE80211_ENCRYPT_HEADROOM
);
774 /* copy control information */
775 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
776 skb_copy_queue_mapping(tmp
, skb
);
777 tmp
->priority
= skb
->priority
;
780 /* copy header and data */
781 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
782 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
787 skb
->len
= hdrlen
+ per_fragm
;
791 static ieee80211_tx_result debug_noinline
792 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
794 struct sk_buff
*skb
= tx
->skb
;
795 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
796 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
797 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
801 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
805 * Warn when submitting a fragmented A-MPDU frame and drop it.
806 * This scenario is handled in ieee80211_tx_prepare but extra
807 * caution taken here as fragmented ampdu may cause Tx stop.
809 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
812 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
814 /* internal error, why is TX_FRAGMENTED set? */
815 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
819 * Now fragment the frame. This will allocate all the fragments and
820 * chain them (using skb as the first fragment) to skb->next.
821 * During transmission, we will remove the successfully transmitted
822 * fragments from this list. When the low-level driver rejects one
823 * of the fragments then we will simply pretend to accept the skb
824 * but store it away as pending.
826 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
829 /* update duration/seq/flags of fragments */
833 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
835 hdr
= (void *)skb
->data
;
836 info
= IEEE80211_SKB_CB(skb
);
839 hdr
->frame_control
|= morefrags
;
840 next_len
= skb
->next
->len
;
842 * No multi-rate retries for fragmented frames, that
843 * would completely throw off the NAV at other STAs.
845 info
->control
.rates
[1].idx
= -1;
846 info
->control
.rates
[2].idx
= -1;
847 info
->control
.rates
[3].idx
= -1;
848 info
->control
.rates
[4].idx
= -1;
849 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
850 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
852 hdr
->frame_control
&= ~morefrags
;
855 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
856 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
858 } while ((skb
= skb
->next
));
863 static ieee80211_tx_result debug_noinline
864 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
869 switch (tx
->key
->conf
.alg
) {
871 return ieee80211_crypto_wep_encrypt(tx
);
873 return ieee80211_crypto_tkip_encrypt(tx
);
875 return ieee80211_crypto_ccmp_encrypt(tx
);
877 return ieee80211_crypto_aes_cmac_encrypt(tx
);
885 static ieee80211_tx_result debug_noinline
886 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
888 struct sk_buff
*skb
= tx
->skb
;
889 struct ieee80211_hdr
*hdr
;
894 hdr
= (void *) skb
->data
;
895 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
896 break; /* must not overwrite AID */
897 next_len
= skb
->next
? skb
->next
->len
: 0;
898 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
901 ieee80211_duration(tx
, group_addr
, next_len
);
902 } while ((skb
= skb
->next
));
907 static ieee80211_tx_result debug_noinline
908 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
910 struct sk_buff
*skb
= tx
->skb
;
915 tx
->sta
->tx_packets
++;
917 tx
->sta
->tx_fragments
++;
918 tx
->sta
->tx_bytes
+= skb
->len
;
919 } while ((skb
= skb
->next
));
924 /* actual transmit path */
927 * deal with packet injection down monitor interface
928 * with Radiotap Header -- only called for monitor mode interface
930 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
934 * this is the moment to interpret and discard the radiotap header that
935 * must be at the start of the packet injected in Monitor mode
937 * Need to take some care with endian-ness since radiotap
938 * args are little-endian
941 struct ieee80211_radiotap_iterator iterator
;
942 struct ieee80211_radiotap_header
*rthdr
=
943 (struct ieee80211_radiotap_header
*) skb
->data
;
944 struct ieee80211_supported_band
*sband
;
945 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
946 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
948 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
950 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
951 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
954 * for every radiotap entry that is present
955 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
956 * entries present, or -EINVAL on error)
960 ret
= ieee80211_radiotap_iterator_next(&iterator
);
965 /* see if this argument is something we can use */
966 switch (iterator
.this_arg_index
) {
968 * You must take care when dereferencing iterator.this_arg
969 * for multibyte types... the pointer is not aligned. Use
970 * get_unaligned((type *)iterator.this_arg) to dereference
971 * iterator.this_arg for type "type" safely on all arches.
973 case IEEE80211_RADIOTAP_FLAGS
:
974 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
976 * this indicates that the skb we have been
977 * handed has the 32-bit FCS CRC at the end...
978 * we should react to that by snipping it off
979 * because it will be recomputed and added
982 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
985 skb_trim(skb
, skb
->len
- FCS_LEN
);
987 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
988 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
989 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
990 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
994 * Please update the file
995 * Documentation/networking/mac80211-injection.txt
996 * when parsing new fields here.
1004 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1008 * remove the radiotap header
1009 * iterator->max_length was sanity-checked against
1010 * skb->len by iterator init
1012 skb_pull(skb
, iterator
.max_length
);
1020 static ieee80211_tx_result
1021 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1022 struct ieee80211_tx_data
*tx
,
1023 struct sk_buff
*skb
)
1025 struct ieee80211_local
*local
= sdata
->local
;
1026 struct ieee80211_hdr
*hdr
;
1027 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1030 bool queued
= false;
1032 memset(tx
, 0, sizeof(*tx
));
1034 tx
->dev
= sdata
->dev
; /* use original interface */
1037 tx
->channel
= local
->hw
.conf
.channel
;
1039 * Set this flag (used below to indicate "automatic fragmentation"),
1040 * it will be cleared/left by radiotap as desired.
1042 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1044 /* process and remove the injection radiotap header */
1045 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1046 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1050 * __ieee80211_parse_tx_radiotap has now removed
1051 * the radiotap header that was present and pre-filled
1052 * 'tx' with tx control information.
1057 * If this flag is set to true anywhere, and we get here,
1058 * we are doing the needed processing, so remove the flag
1061 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1063 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1065 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1067 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1068 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1069 unsigned long flags
;
1070 struct tid_ampdu_tx
*tid_tx
;
1072 qc
= ieee80211_get_qos_ctl(hdr
);
1073 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1075 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1077 * XXX: This spinlock could be fairly expensive, but see the
1078 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1079 * One way to solve this would be to do something RCU-like
1080 * for managing the tid_tx struct and using atomic bitops
1081 * for the actual state -- by introducing an actual
1082 * 'operational' bit that would be possible. It would
1083 * require changing ieee80211_agg_tx_operational() to
1084 * set that bit, and changing the way tid_tx is managed
1085 * everywhere, including races between that bit and
1086 * tid_tx going away (tid_tx being added can be easily
1087 * committed to memory before the 'operational' bit).
1089 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1090 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1091 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1092 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1093 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1096 info
->control
.vif
= &sdata
->vif
;
1097 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1098 __skb_queue_tail(&tid_tx
->pending
, skb
);
1100 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1102 if (unlikely(queued
))
1106 if (is_multicast_ether_addr(hdr
->addr1
)) {
1107 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1108 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1110 tx
->flags
|= IEEE80211_TX_UNICAST
;
1111 if (unlikely(local
->wifi_wme_noack_test
))
1112 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1114 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1117 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1118 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1119 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1120 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1121 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1123 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1127 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1128 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1129 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1131 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1132 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1133 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1134 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1136 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1141 static int __ieee80211_tx(struct ieee80211_local
*local
,
1142 struct sk_buff
**skbp
,
1143 struct sta_info
*sta
,
1146 struct sk_buff
*skb
= *skbp
, *next
;
1147 struct ieee80211_tx_info
*info
;
1148 struct ieee80211_sub_if_data
*sdata
;
1149 unsigned long flags
;
1154 int q
= skb_get_queue_mapping(skb
);
1156 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1157 ret
= IEEE80211_TX_OK
;
1158 if (local
->queue_stop_reasons
[q
] ||
1159 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1160 ret
= IEEE80211_TX_PENDING
;
1161 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1162 if (ret
!= IEEE80211_TX_OK
)
1165 info
= IEEE80211_SKB_CB(skb
);
1168 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1169 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1174 sdata
= vif_to_sdata(info
->control
.vif
);
1176 switch (sdata
->vif
.type
) {
1177 case NL80211_IFTYPE_MONITOR
:
1178 info
->control
.vif
= NULL
;
1180 case NL80211_IFTYPE_AP_VLAN
:
1181 info
->control
.vif
= &container_of(sdata
->bss
,
1182 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1189 ret
= drv_tx(local
, skb
);
1190 info
->control
.vif
= &sdata
->vif
;
1191 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1195 if (ret
!= NETDEV_TX_OK
)
1196 return IEEE80211_TX_AGAIN
;
1198 ieee80211_led_tx(local
, 1);
1202 return IEEE80211_TX_OK
;
1206 * Invoke TX handlers, return 0 on success and non-zero if the
1207 * frame was dropped or queued.
1209 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1211 struct sk_buff
*skb
= tx
->skb
;
1212 ieee80211_tx_result res
= TX_DROP
;
1214 #define CALL_TXH(txh) \
1216 if (res != TX_CONTINUE) \
1219 CALL_TXH(ieee80211_tx_h_check_assoc
)
1220 CALL_TXH(ieee80211_tx_h_ps_buf
)
1221 CALL_TXH(ieee80211_tx_h_select_key
)
1222 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1223 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1224 CALL_TXH(ieee80211_tx_h_misc
)
1225 CALL_TXH(ieee80211_tx_h_sequence
)
1226 CALL_TXH(ieee80211_tx_h_fragment
)
1227 /* handlers after fragment must be aware of tx info fragmentation! */
1228 CALL_TXH(ieee80211_tx_h_encrypt
)
1229 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1230 CALL_TXH(ieee80211_tx_h_stats
)
1234 if (unlikely(res
== TX_DROP
)) {
1235 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1237 struct sk_buff
*next
;
1244 } else if (unlikely(res
== TX_QUEUED
)) {
1245 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1252 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1253 struct sk_buff
*skb
, bool txpending
)
1255 struct ieee80211_local
*local
= sdata
->local
;
1256 struct ieee80211_tx_data tx
;
1257 ieee80211_tx_result res_prepare
;
1258 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1259 struct sk_buff
*next
;
1260 unsigned long flags
;
1264 queue
= skb_get_queue_mapping(skb
);
1266 if (unlikely(skb
->len
< 10)) {
1273 /* initialises tx */
1274 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1276 if (unlikely(res_prepare
== TX_DROP
)) {
1280 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1285 tx
.channel
= local
->hw
.conf
.channel
;
1286 info
->band
= tx
.channel
->band
;
1288 if (invoke_tx_handlers(&tx
))
1293 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1295 case IEEE80211_TX_OK
:
1297 case IEEE80211_TX_AGAIN
:
1299 * Since there are no fragmented frames on A-MPDU
1300 * queues, there's no reason for a driver to reject
1301 * a frame there, warn and drop it.
1303 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1306 case IEEE80211_TX_PENDING
:
1309 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1311 if (local
->queue_stop_reasons
[queue
] ||
1312 !skb_queue_empty(&local
->pending
[queue
])) {
1314 * if queue is stopped, queue up frames for later
1315 * transmission from the tasklet
1320 if (unlikely(txpending
))
1321 __skb_queue_head(&local
->pending
[queue
],
1324 __skb_queue_tail(&local
->pending
[queue
],
1326 } while ((skb
= next
));
1328 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1332 * otherwise retry, but this is a race condition or
1333 * a driver bug (which we warn about if it persists)
1335 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1339 if (WARN(retries
> 10, "tx refused but queue active\n"))
1359 /* device xmit handlers */
1361 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1362 struct sk_buff
*skb
,
1363 int head_need
, bool may_encrypt
)
1368 * This could be optimised, devices that do full hardware
1369 * crypto (including TKIP MMIC) need no tailroom... But we
1370 * have no drivers for such devices currently.
1373 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1374 tail_need
-= skb_tailroom(skb
);
1375 tail_need
= max_t(int, tail_need
, 0);
1378 if (head_need
|| tail_need
) {
1379 /* Sorry. Can't account for this any more */
1383 if (skb_header_cloned(skb
))
1384 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1386 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1388 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1389 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1390 wiphy_name(local
->hw
.wiphy
));
1394 /* update truesize too */
1395 skb
->truesize
+= head_need
+ tail_need
;
1400 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1401 struct sk_buff
*skb
)
1403 struct ieee80211_local
*local
= sdata
->local
;
1404 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1405 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1406 struct ieee80211_sub_if_data
*tmp_sdata
;
1410 dev_hold(sdata
->dev
);
1412 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1413 local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
1414 !(local
->scanning
) && local
->ps_sdata
) {
1415 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1416 ieee80211_stop_queues_by_reason(&local
->hw
,
1417 IEEE80211_QUEUE_STOP_REASON_PS
);
1418 queue_work(local
->hw
.workqueue
,
1419 &local
->dynamic_ps_disable_work
);
1422 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1423 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1426 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1428 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1429 ieee80211_is_data(hdr
->frame_control
)) {
1430 if (is_multicast_ether_addr(hdr
->addr3
))
1431 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1433 if (mesh_nexthop_lookup(skb
, sdata
)) {
1434 dev_put(sdata
->dev
);
1437 } else if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1441 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1443 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1444 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1445 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1447 /* check the header is complete in the frame */
1448 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1450 * We process outgoing injected frames that have a
1451 * local address we handle as though they are our
1453 * This code here isn't entirely correct, the local
1454 * MAC address is not necessarily enough to find
1455 * the interface to use; for that proper VLAN/WDS
1456 * support we will need a different mechanism.
1460 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1462 if (!netif_running(tmp_sdata
->dev
))
1464 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1466 if (compare_ether_addr(tmp_sdata
->dev
->dev_addr
,
1468 dev_hold(tmp_sdata
->dev
);
1469 dev_put(sdata
->dev
);
1478 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1480 headroom
= local
->tx_headroom
;
1482 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1483 headroom
-= skb_headroom(skb
);
1484 headroom
= max_t(int, 0, headroom
);
1486 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1488 dev_put(sdata
->dev
);
1492 info
->control
.vif
= &sdata
->vif
;
1494 ieee80211_select_queue(local
, skb
);
1495 ieee80211_tx(sdata
, skb
, false);
1496 dev_put(sdata
->dev
);
1499 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1500 struct net_device
*dev
)
1502 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1503 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1504 struct ieee80211_radiotap_header
*prthdr
=
1505 (struct ieee80211_radiotap_header
*)skb
->data
;
1506 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1510 * Frame injection is not allowed if beaconing is not allowed
1511 * or if we need radar detection. Beaconing is usually not allowed when
1512 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1513 * Passive scan is also used in world regulatory domains where
1514 * your country is not known and as such it should be treated as
1515 * NO TX unless the channel is explicitly allowed in which case
1516 * your current regulatory domain would not have the passive scan
1519 * Since AP mode uses monitor interfaces to inject/TX management
1520 * frames we can make AP mode the exception to this rule once it
1521 * supports radar detection as its implementation can deal with
1522 * radar detection by itself. We can do that later by adding a
1523 * monitor flag interfaces used for AP support.
1525 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1526 IEEE80211_CHAN_PASSIVE_SCAN
)))
1529 /* check for not even having the fixed radiotap header part */
1530 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1531 goto fail
; /* too short to be possibly valid */
1533 /* is it a header version we can trust to find length from? */
1534 if (unlikely(prthdr
->it_version
))
1535 goto fail
; /* only version 0 is supported */
1537 /* then there must be a radiotap header with a length we can use */
1538 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1540 /* does the skb contain enough to deliver on the alleged length? */
1541 if (unlikely(skb
->len
< len_rthdr
))
1542 goto fail
; /* skb too short for claimed rt header extent */
1545 * fix up the pointers accounting for the radiotap
1546 * header still being in there. We are being given
1547 * a precooked IEEE80211 header so no need for
1550 skb_set_mac_header(skb
, len_rthdr
);
1552 * these are just fixed to the end of the rt area since we
1553 * don't have any better information and at this point, nobody cares
1555 skb_set_network_header(skb
, len_rthdr
);
1556 skb_set_transport_header(skb
, len_rthdr
);
1558 memset(info
, 0, sizeof(*info
));
1560 /* pass the radiotap header up to xmit */
1561 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1562 return NETDEV_TX_OK
;
1566 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1570 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1571 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1572 * @skb: packet to be sent
1573 * @dev: incoming interface
1575 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1576 * not be freed, and caller is responsible for either retrying later or freeing
1579 * This function takes in an Ethernet header and encapsulates it with suitable
1580 * IEEE 802.11 header based on which interface the packet is coming in. The
1581 * encapsulated packet will then be passed to master interface, wlan#.11, for
1582 * transmission (through low-level driver).
1584 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1585 struct net_device
*dev
)
1587 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1588 struct ieee80211_local
*local
= sdata
->local
;
1589 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1590 int ret
= NETDEV_TX_BUSY
, head_need
;
1591 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1593 struct ieee80211_hdr hdr
;
1594 struct ieee80211s_hdr mesh_hdr
;
1595 const u8
*encaps_data
;
1596 int encaps_len
, skip_header_bytes
;
1598 struct sta_info
*sta
;
1601 if (unlikely(skb
->len
< ETH_HLEN
)) {
1606 nh_pos
= skb_network_header(skb
) - skb
->data
;
1607 h_pos
= skb_transport_header(skb
) - skb
->data
;
1609 /* convert Ethernet header to proper 802.11 header (based on
1610 * operation mode) */
1611 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1612 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1614 switch (sdata
->vif
.type
) {
1615 case NL80211_IFTYPE_AP
:
1616 case NL80211_IFTYPE_AP_VLAN
:
1617 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1619 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1620 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1621 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1624 case NL80211_IFTYPE_WDS
:
1625 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1627 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1628 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1629 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1630 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1633 #ifdef CONFIG_MAC80211_MESH
1634 case NL80211_IFTYPE_MESH_POINT
:
1635 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1636 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1637 /* Do not send frames with mesh_ttl == 0 */
1638 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1642 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1644 if (compare_ether_addr(dev
->dev_addr
,
1645 skb
->data
+ ETH_ALEN
) == 0) {
1647 memset(hdr
.addr1
, 0, 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
);
1651 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1653 /* packet from other interface */
1654 struct mesh_path
*mppath
;
1656 memset(hdr
.addr1
, 0, ETH_ALEN
);
1657 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1658 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1660 if (is_multicast_ether_addr(skb
->data
))
1661 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1664 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1666 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1668 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1672 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1673 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1674 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1675 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1676 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1677 sdata
->u
.mesh
.mesh_seqnum
++;
1683 case NL80211_IFTYPE_STATION
:
1684 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1686 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1687 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1688 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1691 case NL80211_IFTYPE_ADHOC
:
1693 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1694 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1695 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1704 * There's no need to try to look up the destination
1705 * if it is a multicast address (which can only happen
1708 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1710 sta
= sta_info_get(local
, hdr
.addr1
);
1712 sta_flags
= get_sta_flags(sta
);
1716 /* receiver and we are QoS enabled, use a QoS type frame */
1717 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1718 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1723 * Drop unicast frames to unauthorised stations unless they are
1724 * EAPOL frames from the local station.
1726 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1727 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1728 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1729 !(ethertype
== ETH_P_PAE
&&
1730 compare_ether_addr(dev
->dev_addr
,
1731 skb
->data
+ ETH_ALEN
) == 0))) {
1732 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1733 if (net_ratelimit())
1734 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1735 " (unauthorized port)\n", dev
->name
,
1739 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1745 hdr
.frame_control
= fc
;
1746 hdr
.duration_id
= 0;
1749 skip_header_bytes
= ETH_HLEN
;
1750 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1751 encaps_data
= bridge_tunnel_header
;
1752 encaps_len
= sizeof(bridge_tunnel_header
);
1753 skip_header_bytes
-= 2;
1754 } else if (ethertype
>= 0x600) {
1755 encaps_data
= rfc1042_header
;
1756 encaps_len
= sizeof(rfc1042_header
);
1757 skip_header_bytes
-= 2;
1763 skb_pull(skb
, skip_header_bytes
);
1764 nh_pos
-= skip_header_bytes
;
1765 h_pos
-= skip_header_bytes
;
1767 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1770 * So we need to modify the skb header and hence need a copy of
1771 * that. The head_need variable above doesn't, so far, include
1772 * the needed header space that we don't need right away. If we
1773 * can, then we don't reallocate right now but only after the
1774 * frame arrives at the master device (if it does...)
1776 * If we cannot, however, then we will reallocate to include all
1777 * the ever needed space. Also, if we need to reallocate it anyway,
1778 * make it big enough for everything we may ever need.
1781 if (head_need
> 0 || skb_cloned(skb
)) {
1782 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1783 head_need
+= local
->tx_headroom
;
1784 head_need
= max_t(int, 0, head_need
);
1785 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1790 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1791 nh_pos
+= encaps_len
;
1792 h_pos
+= encaps_len
;
1795 if (meshhdrlen
> 0) {
1796 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1797 nh_pos
+= meshhdrlen
;
1798 h_pos
+= meshhdrlen
;
1801 if (ieee80211_is_data_qos(fc
)) {
1802 __le16
*qos_control
;
1804 qos_control
= (__le16
*) skb_push(skb
, 2);
1805 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1807 * Maybe we could actually set some fields here, for now just
1808 * initialise to zero to indicate no special operation.
1812 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1817 dev
->stats
.tx_packets
++;
1818 dev
->stats
.tx_bytes
+= skb
->len
;
1820 /* Update skb pointers to various headers since this modified frame
1821 * is going to go through Linux networking code that may potentially
1822 * need things like pointer to IP header. */
1823 skb_set_mac_header(skb
, 0);
1824 skb_set_network_header(skb
, nh_pos
);
1825 skb_set_transport_header(skb
, h_pos
);
1827 memset(info
, 0, sizeof(*info
));
1829 dev
->trans_start
= jiffies
;
1830 ieee80211_xmit(sdata
, skb
);
1832 return NETDEV_TX_OK
;
1835 if (ret
== NETDEV_TX_OK
)
1843 * ieee80211_clear_tx_pending may not be called in a context where
1844 * it is possible that it packets could come in again.
1846 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1850 for (i
= 0; i
< local
->hw
.queues
; i
++)
1851 skb_queue_purge(&local
->pending
[i
]);
1854 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1855 struct sk_buff
*skb
)
1857 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1858 struct ieee80211_sub_if_data
*sdata
;
1859 struct sta_info
*sta
;
1860 struct ieee80211_hdr
*hdr
;
1864 sdata
= vif_to_sdata(info
->control
.vif
);
1866 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1867 ieee80211_tx(sdata
, skb
, true);
1869 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1870 sta
= sta_info_get(local
, hdr
->addr1
);
1872 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
1873 if (ret
!= IEEE80211_TX_OK
)
1881 * Transmit all pending packets. Called from tasklet.
1883 void ieee80211_tx_pending(unsigned long data
)
1885 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1886 unsigned long flags
;
1892 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1893 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1895 * If queue is stopped by something other than due to pending
1896 * frames, or we have no pending frames, proceed to next queue.
1898 if (local
->queue_stop_reasons
[i
] ||
1899 skb_queue_empty(&local
->pending
[i
]))
1902 while (!skb_queue_empty(&local
->pending
[i
])) {
1903 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
1904 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1905 struct ieee80211_sub_if_data
*sdata
;
1907 sdata
= vif_to_sdata(info
->control
.vif
);
1908 dev_hold(sdata
->dev
);
1909 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1912 txok
= ieee80211_tx_pending_skb(local
, skb
);
1913 dev_put(sdata
->dev
);
1915 __skb_queue_head(&local
->pending
[i
], skb
);
1916 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
1922 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1927 /* functions for drivers to get certain frames */
1929 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1930 struct sk_buff
*skb
,
1931 struct beacon_data
*beacon
)
1935 int i
, have_bits
= 0, n1
, n2
;
1937 /* Generate bitmap for TIM only if there are any STAs in power save
1939 if (atomic_read(&bss
->num_sta_ps
) > 0)
1940 /* in the hope that this is faster than
1941 * checking byte-for-byte */
1942 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1943 IEEE80211_MAX_AID
+1);
1945 if (bss
->dtim_count
== 0)
1946 bss
->dtim_count
= beacon
->dtim_period
- 1;
1950 tim
= pos
= (u8
*) skb_put(skb
, 6);
1951 *pos
++ = WLAN_EID_TIM
;
1953 *pos
++ = bss
->dtim_count
;
1954 *pos
++ = beacon
->dtim_period
;
1956 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1960 /* Find largest even number N1 so that bits numbered 1 through
1961 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1962 * (N2 + 1) x 8 through 2007 are 0. */
1964 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1971 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1978 /* Bitmap control */
1980 /* Part Virt Bitmap */
1981 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1983 tim
[1] = n2
- n1
+ 4;
1984 skb_put(skb
, n2
- n1
);
1986 *pos
++ = aid0
; /* Bitmap control */
1987 *pos
++ = 0; /* Part Virt Bitmap */
1991 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1992 struct ieee80211_vif
*vif
)
1994 struct ieee80211_local
*local
= hw_to_local(hw
);
1995 struct sk_buff
*skb
= NULL
;
1996 struct ieee80211_tx_info
*info
;
1997 struct ieee80211_sub_if_data
*sdata
= NULL
;
1998 struct ieee80211_if_ap
*ap
= NULL
;
1999 struct beacon_data
*beacon
;
2000 struct ieee80211_supported_band
*sband
;
2001 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2003 sband
= local
->hw
.wiphy
->bands
[band
];
2007 sdata
= vif_to_sdata(vif
);
2009 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2011 beacon
= rcu_dereference(ap
->beacon
);
2014 * headroom, head length,
2015 * tail length and maximum TIM length
2017 skb
= dev_alloc_skb(local
->tx_headroom
+
2019 beacon
->tail_len
+ 256);
2023 skb_reserve(skb
, local
->tx_headroom
);
2024 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2028 * Not very nice, but we want to allow the driver to call
2029 * ieee80211_beacon_get() as a response to the set_tim()
2030 * callback. That, however, is already invoked under the
2031 * sta_lock to guarantee consistent and race-free update
2032 * of the tim bitmap in mac80211 and the driver.
2034 if (local
->tim_in_locked_section
) {
2035 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2037 unsigned long flags
;
2039 spin_lock_irqsave(&local
->sta_lock
, flags
);
2040 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2041 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2045 memcpy(skb_put(skb
, beacon
->tail_len
),
2046 beacon
->tail
, beacon
->tail_len
);
2049 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2050 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2051 struct ieee80211_hdr
*hdr
;
2052 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2057 skb
= skb_copy(presp
, GFP_ATOMIC
);
2061 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2062 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2063 IEEE80211_STYPE_BEACON
);
2064 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2065 struct ieee80211_mgmt
*mgmt
;
2068 /* headroom, head length, tail length and maximum TIM length */
2069 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2073 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2074 mgmt
= (struct ieee80211_mgmt
*)
2075 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2076 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2077 mgmt
->frame_control
=
2078 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2079 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2080 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2081 /* BSSID is left zeroed, wildcard value */
2082 mgmt
->u
.beacon
.beacon_int
=
2083 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2084 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2086 pos
= skb_put(skb
, 2);
2087 *pos
++ = WLAN_EID_SSID
;
2090 mesh_mgmt_ies_add(skb
, sdata
);
2096 info
= IEEE80211_SKB_CB(skb
);
2098 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2101 * XXX: For now, always use the lowest rate
2103 info
->control
.rates
[0].idx
= 0;
2104 info
->control
.rates
[0].count
= 1;
2105 info
->control
.rates
[1].idx
= -1;
2106 info
->control
.rates
[2].idx
= -1;
2107 info
->control
.rates
[3].idx
= -1;
2108 info
->control
.rates
[4].idx
= -1;
2109 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2111 info
->control
.vif
= vif
;
2113 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2114 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2115 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2120 EXPORT_SYMBOL(ieee80211_beacon_get
);
2122 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2123 const void *frame
, size_t frame_len
,
2124 const struct ieee80211_tx_info
*frame_txctl
,
2125 struct ieee80211_rts
*rts
)
2127 const struct ieee80211_hdr
*hdr
= frame
;
2129 rts
->frame_control
=
2130 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2131 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2133 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2134 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2136 EXPORT_SYMBOL(ieee80211_rts_get
);
2138 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2139 const void *frame
, size_t frame_len
,
2140 const struct ieee80211_tx_info
*frame_txctl
,
2141 struct ieee80211_cts
*cts
)
2143 const struct ieee80211_hdr
*hdr
= frame
;
2145 cts
->frame_control
=
2146 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2147 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2148 frame_len
, frame_txctl
);
2149 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2151 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2154 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2155 struct ieee80211_vif
*vif
)
2157 struct ieee80211_local
*local
= hw_to_local(hw
);
2158 struct sk_buff
*skb
= NULL
;
2159 struct sta_info
*sta
;
2160 struct ieee80211_tx_data tx
;
2161 struct ieee80211_sub_if_data
*sdata
;
2162 struct ieee80211_if_ap
*bss
= NULL
;
2163 struct beacon_data
*beacon
;
2164 struct ieee80211_tx_info
*info
;
2166 sdata
= vif_to_sdata(vif
);
2170 beacon
= rcu_dereference(bss
->beacon
);
2172 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2175 if (bss
->dtim_count
!= 0)
2176 goto out
; /* send buffered bc/mc only after DTIM beacon */
2179 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2182 local
->total_ps_buffered
--;
2184 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2185 struct ieee80211_hdr
*hdr
=
2186 (struct ieee80211_hdr
*) skb
->data
;
2187 /* more buffered multicast/broadcast frames ==> set
2188 * MoreData flag in IEEE 802.11 header to inform PS
2190 hdr
->frame_control
|=
2191 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2194 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2196 dev_kfree_skb_any(skb
);
2199 info
= IEEE80211_SKB_CB(skb
);
2202 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2203 tx
.channel
= local
->hw
.conf
.channel
;
2204 info
->band
= tx
.channel
->band
;
2206 if (invoke_tx_handlers(&tx
))
2213 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2215 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
2218 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2219 skb_set_mac_header(skb
, 0);
2220 skb_set_network_header(skb
, 0);
2221 skb_set_transport_header(skb
, 0);
2224 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2227 * The other path calling ieee80211_xmit is from the tasklet,
2228 * and while we can handle concurrent transmissions locking
2229 * requirements are that we do not come into tx with bhs on.
2232 ieee80211_xmit(sdata
, skb
);