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_OFF_CHANNEL
, &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 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
322 /* device releases frame after DTIM beacon */
323 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
326 /* buffered in mac80211 */
327 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
328 purge_old_ps_buffers(tx
->local
);
330 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
331 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
333 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
336 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
338 tx
->local
->total_ps_buffered
++;
340 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
345 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
348 if (!ieee80211_is_mgmt(fc
))
351 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
354 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
361 static ieee80211_tx_result
362 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
364 struct sta_info
*sta
= tx
->sta
;
365 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
366 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
369 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)
370 || ieee80211_is_auth(hdr
->frame_control
)
371 || ieee80211_is_assoc_resp(hdr
->frame_control
)
372 || ieee80211_is_reassoc_resp(hdr
->frame_control
)))
375 staflags
= get_sta_flags(sta
);
377 if (unlikely((staflags
& WLAN_STA_PS
) &&
378 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
379 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
380 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
382 sta
->sta
.addr
, sta
->sta
.aid
,
383 skb_queue_len(&sta
->ps_tx_buf
));
384 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
385 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
386 purge_old_ps_buffers(tx
->local
);
387 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
388 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
389 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
390 if (net_ratelimit()) {
391 printk(KERN_DEBUG
"%s: STA %pM TX "
392 "buffer full - dropping oldest frame\n",
393 tx
->dev
->name
, sta
->sta
.addr
);
398 tx
->local
->total_ps_buffered
++;
400 /* Queue frame to be sent after STA sends an PS Poll frame */
401 if (skb_queue_empty(&sta
->ps_tx_buf
))
402 sta_info_set_tim_bit(sta
);
404 info
->control
.jiffies
= jiffies
;
405 info
->control
.vif
= &tx
->sdata
->vif
;
406 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
407 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
410 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
411 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
412 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
413 "set -> send frame\n", tx
->dev
->name
,
416 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
421 static ieee80211_tx_result debug_noinline
422 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
424 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
427 if (tx
->flags
& IEEE80211_TX_UNICAST
)
428 return ieee80211_tx_h_unicast_ps_buf(tx
);
430 return ieee80211_tx_h_multicast_ps_buf(tx
);
433 static ieee80211_tx_result debug_noinline
434 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
436 struct ieee80211_key
*key
= NULL
;
437 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
438 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
440 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
442 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
444 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
445 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
447 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
449 else if (tx
->sdata
->drop_unencrypted
&&
450 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
451 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
452 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
453 (ieee80211_is_action(hdr
->frame_control
) &&
454 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
455 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
461 tx
->key
->tx_rx_count
++;
462 /* TODO: add threshold stuff again */
464 switch (tx
->key
->conf
.alg
) {
466 if (ieee80211_is_auth(hdr
->frame_control
))
469 if (!ieee80211_is_data_present(hdr
->frame_control
))
473 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
474 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
479 if (!ieee80211_is_mgmt(hdr
->frame_control
))
485 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
486 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
491 static ieee80211_tx_result debug_noinline
492 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
494 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
495 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
496 struct ieee80211_supported_band
*sband
;
497 struct ieee80211_rate
*rate
;
499 bool inval
= false, rts
= false, short_preamble
= false;
500 struct ieee80211_tx_rate_control txrc
;
503 memset(&txrc
, 0, sizeof(txrc
));
505 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
507 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
508 tx
->local
->hw
.wiphy
->frag_threshold
);
510 /* set up the tx rate control struct we give the RC algo */
511 txrc
.hw
= local_to_hw(tx
->local
);
513 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
515 txrc
.reported_rate
.idx
= -1;
516 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
518 /* set up RTS protection if desired */
519 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
520 txrc
.rts
= rts
= true;
524 * Use short preamble if the BSS can handle it, but not for
525 * management frames unless we know the receiver can handle
526 * that -- the management frame might be to a station that
527 * just wants a probe response.
529 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
530 (ieee80211_is_data(hdr
->frame_control
) ||
531 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
532 txrc
.short_preamble
= short_preamble
= true;
534 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
537 * Lets not bother rate control if we're associated and cannot
538 * talk to the sta. This should not happen.
540 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
541 (sta_flags
& WLAN_STA_ASSOC
) &&
542 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
543 "%s: Dropped data frame as no usable bitrate found while "
544 "scanning and associated. Target station: "
545 "%pM on %d GHz band\n",
546 tx
->dev
->name
, hdr
->addr1
,
547 tx
->channel
->band
? 5 : 2))
551 * If we're associated with the sta at this point we know we can at
552 * least send the frame at the lowest bit rate.
554 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
556 if (unlikely(info
->control
.rates
[0].idx
< 0))
559 if (txrc
.reported_rate
.idx
< 0)
560 txrc
.reported_rate
= info
->control
.rates
[0];
563 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
565 if (unlikely(!info
->control
.rates
[0].count
))
566 info
->control
.rates
[0].count
= 1;
568 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
569 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
570 info
->control
.rates
[0].count
= 1;
572 if (is_multicast_ether_addr(hdr
->addr1
)) {
574 * XXX: verify the rate is in the basic rateset
580 * set up the RTS/CTS rate as the fastest basic rate
581 * that is not faster than the data rate
583 * XXX: Should this check all retry rates?
585 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
588 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
590 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
591 /* must be a basic rate */
592 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
594 /* must not be faster than the data rate */
595 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
598 if (sband
->bitrates
[baserate
].bitrate
<
599 sband
->bitrates
[i
].bitrate
)
603 info
->control
.rts_cts_rate_idx
= baserate
;
606 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
608 * make sure there's no valid rate following
609 * an invalid one, just in case drivers don't
610 * take the API seriously to stop at -1.
613 info
->control
.rates
[i
].idx
= -1;
616 if (info
->control
.rates
[i
].idx
< 0) {
622 * For now assume MCS is already set up correctly, this
625 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
626 WARN_ON(info
->control
.rates
[i
].idx
> 76);
630 /* set up RTS protection if desired */
632 info
->control
.rates
[i
].flags
|=
633 IEEE80211_TX_RC_USE_RTS_CTS
;
636 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
637 sband
->n_bitrates
)) {
638 info
->control
.rates
[i
].idx
= -1;
642 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
644 /* set up short preamble */
645 if (short_preamble
&&
646 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
647 info
->control
.rates
[i
].flags
|=
648 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
650 /* set up G protection */
651 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
652 rate
->flags
& IEEE80211_RATE_ERP_G
)
653 info
->control
.rates
[i
].flags
|=
654 IEEE80211_TX_RC_USE_CTS_PROTECT
;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
663 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
666 info
->control
.sta
= &tx
->sta
->sta
;
671 static ieee80211_tx_result debug_noinline
672 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
674 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
675 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
681 * Packet injection may want to control the sequence
682 * number, if we have no matching interface then we
683 * neither assign one ourselves nor ask the driver to.
685 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
688 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
691 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
695 * Anything but QoS data that has a sequence number field
696 * (is long enough) gets a sequence number from the global
699 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
700 /* driver should assign sequence number */
701 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
702 /* for pure STA mode without beacons, we can do it */
703 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
704 tx
->sdata
->sequence_number
+= 0x10;
709 * This should be true for injected/management frames only, for
710 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
711 * above since they are not QoS-data frames.
716 /* include per-STA, per-TID sequence counter */
718 qc
= ieee80211_get_qos_ctl(hdr
);
719 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
720 seq
= &tx
->sta
->tid_seq
[tid
];
722 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
724 /* Increase the sequence number. */
725 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
730 static int ieee80211_fragment(struct ieee80211_local
*local
,
731 struct sk_buff
*skb
, int hdrlen
,
734 struct sk_buff
*tail
= skb
, *tmp
;
735 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
736 int pos
= hdrlen
+ per_fragm
;
737 int rem
= skb
->len
- hdrlen
- per_fragm
;
739 if (WARN_ON(rem
< 0))
743 int fraglen
= per_fragm
;
748 tmp
= dev_alloc_skb(local
->tx_headroom
+
750 IEEE80211_ENCRYPT_HEADROOM
+
751 IEEE80211_ENCRYPT_TAILROOM
);
756 skb_reserve(tmp
, local
->tx_headroom
+
757 IEEE80211_ENCRYPT_HEADROOM
);
758 /* copy control information */
759 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
760 skb_copy_queue_mapping(tmp
, skb
);
761 tmp
->priority
= skb
->priority
;
764 /* copy header and data */
765 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
766 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
771 skb
->len
= hdrlen
+ per_fragm
;
775 static ieee80211_tx_result debug_noinline
776 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
778 struct sk_buff
*skb
= tx
->skb
;
779 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
780 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
781 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
785 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
789 * Warn when submitting a fragmented A-MPDU frame and drop it.
790 * This scenario is handled in ieee80211_tx_prepare but extra
791 * caution taken here as fragmented ampdu may cause Tx stop.
793 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
796 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
798 /* internal error, why is TX_FRAGMENTED set? */
799 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
803 * Now fragment the frame. This will allocate all the fragments and
804 * chain them (using skb as the first fragment) to skb->next.
805 * During transmission, we will remove the successfully transmitted
806 * fragments from this list. When the low-level driver rejects one
807 * of the fragments then we will simply pretend to accept the skb
808 * but store it away as pending.
810 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
813 /* update duration/seq/flags of fragments */
817 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
819 hdr
= (void *)skb
->data
;
820 info
= IEEE80211_SKB_CB(skb
);
823 hdr
->frame_control
|= morefrags
;
824 next_len
= skb
->next
->len
;
826 * No multi-rate retries for fragmented frames, that
827 * would completely throw off the NAV at other STAs.
829 info
->control
.rates
[1].idx
= -1;
830 info
->control
.rates
[2].idx
= -1;
831 info
->control
.rates
[3].idx
= -1;
832 info
->control
.rates
[4].idx
= -1;
833 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
834 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
836 hdr
->frame_control
&= ~morefrags
;
839 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
840 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
842 } while ((skb
= skb
->next
));
847 static ieee80211_tx_result debug_noinline
848 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
850 struct sk_buff
*skb
= tx
->skb
;
855 tx
->sta
->tx_packets
++;
857 tx
->sta
->tx_fragments
++;
858 tx
->sta
->tx_bytes
+= skb
->len
;
859 } while ((skb
= skb
->next
));
864 static ieee80211_tx_result debug_noinline
865 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
870 switch (tx
->key
->conf
.alg
) {
872 return ieee80211_crypto_wep_encrypt(tx
);
874 return ieee80211_crypto_tkip_encrypt(tx
);
876 return ieee80211_crypto_ccmp_encrypt(tx
);
878 return ieee80211_crypto_aes_cmac_encrypt(tx
);
886 static ieee80211_tx_result debug_noinline
887 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
889 struct sk_buff
*skb
= tx
->skb
;
890 struct ieee80211_hdr
*hdr
;
895 hdr
= (void *) skb
->data
;
896 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
897 break; /* must not overwrite AID */
898 next_len
= skb
->next
? skb
->next
->len
: 0;
899 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
902 ieee80211_duration(tx
, group_addr
, next_len
);
903 } while ((skb
= skb
->next
));
908 /* actual transmit path */
911 * deal with packet injection down monitor interface
912 * with Radiotap Header -- only called for monitor mode interface
914 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
918 * this is the moment to interpret and discard the radiotap header that
919 * must be at the start of the packet injected in Monitor mode
921 * Need to take some care with endian-ness since radiotap
922 * args are little-endian
925 struct ieee80211_radiotap_iterator iterator
;
926 struct ieee80211_radiotap_header
*rthdr
=
927 (struct ieee80211_radiotap_header
*) skb
->data
;
928 struct ieee80211_supported_band
*sband
;
929 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
930 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
932 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
934 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
935 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
938 * for every radiotap entry that is present
939 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
940 * entries present, or -EINVAL on error)
944 ret
= ieee80211_radiotap_iterator_next(&iterator
);
949 /* see if this argument is something we can use */
950 switch (iterator
.this_arg_index
) {
952 * You must take care when dereferencing iterator.this_arg
953 * for multibyte types... the pointer is not aligned. Use
954 * get_unaligned((type *)iterator.this_arg) to dereference
955 * iterator.this_arg for type "type" safely on all arches.
957 case IEEE80211_RADIOTAP_FLAGS
:
958 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
960 * this indicates that the skb we have been
961 * handed has the 32-bit FCS CRC at the end...
962 * we should react to that by snipping it off
963 * because it will be recomputed and added
966 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
969 skb_trim(skb
, skb
->len
- FCS_LEN
);
971 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
972 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
973 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
974 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
978 * Please update the file
979 * Documentation/networking/mac80211-injection.txt
980 * when parsing new fields here.
988 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
992 * remove the radiotap header
993 * iterator->max_length was sanity-checked against
994 * skb->len by iterator init
996 skb_pull(skb
, iterator
.max_length
);
1004 static ieee80211_tx_result
1005 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1006 struct ieee80211_tx_data
*tx
,
1007 struct sk_buff
*skb
)
1009 struct ieee80211_local
*local
= sdata
->local
;
1010 struct ieee80211_hdr
*hdr
;
1011 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1014 bool queued
= false;
1016 memset(tx
, 0, sizeof(*tx
));
1018 tx
->dev
= sdata
->dev
; /* use original interface */
1021 tx
->channel
= local
->hw
.conf
.channel
;
1023 * Set this flag (used below to indicate "automatic fragmentation"),
1024 * it will be cleared/left by radiotap as desired.
1026 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1028 /* process and remove the injection radiotap header */
1029 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1030 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1034 * __ieee80211_parse_tx_radiotap has now removed
1035 * the radiotap header that was present and pre-filled
1036 * 'tx' with tx control information.
1041 * If this flag is set to true anywhere, and we get here,
1042 * we are doing the needed processing, so remove the flag
1045 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1047 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1049 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1051 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1052 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1053 unsigned long flags
;
1054 struct tid_ampdu_tx
*tid_tx
;
1056 qc
= ieee80211_get_qos_ctl(hdr
);
1057 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1059 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1061 * XXX: This spinlock could be fairly expensive, but see the
1062 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1063 * One way to solve this would be to do something RCU-like
1064 * for managing the tid_tx struct and using atomic bitops
1065 * for the actual state -- by introducing an actual
1066 * 'operational' bit that would be possible. It would
1067 * require changing ieee80211_agg_tx_operational() to
1068 * set that bit, and changing the way tid_tx is managed
1069 * everywhere, including races between that bit and
1070 * tid_tx going away (tid_tx being added can be easily
1071 * committed to memory before the 'operational' bit).
1073 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1074 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1075 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1076 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1077 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1080 info
->control
.vif
= &sdata
->vif
;
1081 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1082 __skb_queue_tail(&tid_tx
->pending
, skb
);
1084 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1086 if (unlikely(queued
))
1090 if (is_multicast_ether_addr(hdr
->addr1
)) {
1091 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1092 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1094 tx
->flags
|= IEEE80211_TX_UNICAST
;
1095 if (unlikely(local
->wifi_wme_noack_test
))
1096 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1098 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1101 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1102 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1103 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1104 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1105 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1107 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1111 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1112 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1113 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1115 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1116 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1117 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1118 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1120 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1125 static int __ieee80211_tx(struct ieee80211_local
*local
,
1126 struct sk_buff
**skbp
,
1127 struct sta_info
*sta
,
1130 struct sk_buff
*skb
= *skbp
, *next
;
1131 struct ieee80211_tx_info
*info
;
1132 struct ieee80211_sub_if_data
*sdata
;
1133 unsigned long flags
;
1138 int q
= skb_get_queue_mapping(skb
);
1140 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1141 ret
= IEEE80211_TX_OK
;
1142 if (local
->queue_stop_reasons
[q
] ||
1143 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1144 ret
= IEEE80211_TX_PENDING
;
1145 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1146 if (ret
!= IEEE80211_TX_OK
)
1149 info
= IEEE80211_SKB_CB(skb
);
1152 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1153 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1159 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1161 sdata
= vif_to_sdata(info
->control
.vif
);
1163 switch (sdata
->vif
.type
) {
1164 case NL80211_IFTYPE_MONITOR
:
1165 info
->control
.vif
= NULL
;
1167 case NL80211_IFTYPE_AP_VLAN
:
1168 info
->control
.vif
= &container_of(sdata
->bss
,
1169 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1176 ret
= drv_tx(local
, skb
);
1177 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1181 if (ret
!= NETDEV_TX_OK
) {
1182 info
->control
.vif
= &sdata
->vif
;
1183 return IEEE80211_TX_AGAIN
;
1187 ieee80211_led_tx(local
, 1);
1191 return IEEE80211_TX_OK
;
1195 * Invoke TX handlers, return 0 on success and non-zero if the
1196 * frame was dropped or queued.
1198 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1200 struct sk_buff
*skb
= tx
->skb
;
1201 ieee80211_tx_result res
= TX_DROP
;
1203 #define CALL_TXH(txh) \
1205 if (res != TX_CONTINUE) \
1208 CALL_TXH(ieee80211_tx_h_check_assoc
)
1209 CALL_TXH(ieee80211_tx_h_ps_buf
)
1210 CALL_TXH(ieee80211_tx_h_select_key
)
1211 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1212 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1213 CALL_TXH(ieee80211_tx_h_misc
)
1214 CALL_TXH(ieee80211_tx_h_sequence
)
1215 CALL_TXH(ieee80211_tx_h_fragment
)
1216 /* handlers after fragment must be aware of tx info fragmentation! */
1217 CALL_TXH(ieee80211_tx_h_stats
)
1218 CALL_TXH(ieee80211_tx_h_encrypt
)
1219 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1223 if (unlikely(res
== TX_DROP
)) {
1224 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1226 struct sk_buff
*next
;
1233 } else if (unlikely(res
== TX_QUEUED
)) {
1234 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1241 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1242 struct sk_buff
*skb
, bool txpending
)
1244 struct ieee80211_local
*local
= sdata
->local
;
1245 struct ieee80211_tx_data tx
;
1246 ieee80211_tx_result res_prepare
;
1247 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1248 struct sk_buff
*next
;
1249 unsigned long flags
;
1253 queue
= skb_get_queue_mapping(skb
);
1255 if (unlikely(skb
->len
< 10)) {
1262 /* initialises tx */
1263 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1265 if (unlikely(res_prepare
== TX_DROP
)) {
1269 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1274 tx
.channel
= local
->hw
.conf
.channel
;
1275 info
->band
= tx
.channel
->band
;
1277 if (invoke_tx_handlers(&tx
))
1282 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1284 case IEEE80211_TX_OK
:
1286 case IEEE80211_TX_AGAIN
:
1288 * Since there are no fragmented frames on A-MPDU
1289 * queues, there's no reason for a driver to reject
1290 * a frame there, warn and drop it.
1292 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1295 case IEEE80211_TX_PENDING
:
1298 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1300 if (local
->queue_stop_reasons
[queue
] ||
1301 !skb_queue_empty(&local
->pending
[queue
])) {
1303 * if queue is stopped, queue up frames for later
1304 * transmission from the tasklet
1309 if (unlikely(txpending
))
1310 __skb_queue_head(&local
->pending
[queue
],
1313 __skb_queue_tail(&local
->pending
[queue
],
1315 } while ((skb
= next
));
1317 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1321 * otherwise retry, but this is a race condition or
1322 * a driver bug (which we warn about if it persists)
1324 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1328 if (WARN(retries
> 10, "tx refused but queue active\n"))
1348 /* device xmit handlers */
1350 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1351 struct sk_buff
*skb
,
1352 int head_need
, bool may_encrypt
)
1357 * This could be optimised, devices that do full hardware
1358 * crypto (including TKIP MMIC) need no tailroom... But we
1359 * have no drivers for such devices currently.
1362 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1363 tail_need
-= skb_tailroom(skb
);
1364 tail_need
= max_t(int, tail_need
, 0);
1367 if (head_need
|| tail_need
) {
1368 /* Sorry. Can't account for this any more */
1372 if (skb_header_cloned(skb
))
1373 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1375 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1377 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1378 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1379 wiphy_name(local
->hw
.wiphy
));
1383 /* update truesize too */
1384 skb
->truesize
+= head_need
+ tail_need
;
1389 static bool need_dynamic_ps(struct ieee80211_local
*local
)
1391 /* driver doesn't support power save */
1392 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
1395 /* hardware does dynamic power save */
1396 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
1399 /* dynamic power save disabled */
1400 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
1403 /* we are scanning, don't enable power save */
1404 if (local
->scanning
)
1407 if (!local
->ps_sdata
)
1413 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1414 struct sk_buff
*skb
)
1416 struct ieee80211_local
*local
= sdata
->local
;
1417 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1418 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1419 struct ieee80211_sub_if_data
*tmp_sdata
;
1423 dev_hold(sdata
->dev
);
1425 if (need_dynamic_ps(local
)) {
1426 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1427 ieee80211_stop_queues_by_reason(&local
->hw
,
1428 IEEE80211_QUEUE_STOP_REASON_PS
);
1429 ieee80211_queue_work(&local
->hw
,
1430 &local
->dynamic_ps_disable_work
);
1433 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1434 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1437 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1439 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1443 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1445 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1446 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1447 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1449 /* check the header is complete in the frame */
1450 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1452 * We process outgoing injected frames that have a
1453 * local address we handle as though they are our
1455 * This code here isn't entirely correct, the local
1456 * MAC address is not necessarily enough to find
1457 * the interface to use; for that proper VLAN/WDS
1458 * support we will need a different mechanism.
1462 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1464 if (!netif_running(tmp_sdata
->dev
))
1466 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1468 if (compare_ether_addr(tmp_sdata
->dev
->dev_addr
,
1470 dev_hold(tmp_sdata
->dev
);
1471 dev_put(sdata
->dev
);
1480 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1482 headroom
= local
->tx_headroom
;
1484 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1485 headroom
-= skb_headroom(skb
);
1486 headroom
= max_t(int, 0, headroom
);
1488 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1490 dev_put(sdata
->dev
);
1494 info
->control
.vif
= &sdata
->vif
;
1496 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1497 ieee80211_is_data(hdr
->frame_control
) &&
1498 !is_multicast_ether_addr(hdr
->addr1
))
1499 if (mesh_nexthop_lookup(skb
, sdata
)) {
1500 /* skb queued: don't free */
1501 dev_put(sdata
->dev
);
1505 ieee80211_select_queue(local
, skb
);
1506 ieee80211_tx(sdata
, skb
, false);
1507 dev_put(sdata
->dev
);
1510 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1511 struct net_device
*dev
)
1513 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1514 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1515 struct ieee80211_radiotap_header
*prthdr
=
1516 (struct ieee80211_radiotap_header
*)skb
->data
;
1517 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1521 * Frame injection is not allowed if beaconing is not allowed
1522 * or if we need radar detection. Beaconing is usually not allowed when
1523 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1524 * Passive scan is also used in world regulatory domains where
1525 * your country is not known and as such it should be treated as
1526 * NO TX unless the channel is explicitly allowed in which case
1527 * your current regulatory domain would not have the passive scan
1530 * Since AP mode uses monitor interfaces to inject/TX management
1531 * frames we can make AP mode the exception to this rule once it
1532 * supports radar detection as its implementation can deal with
1533 * radar detection by itself. We can do that later by adding a
1534 * monitor flag interfaces used for AP support.
1536 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1537 IEEE80211_CHAN_PASSIVE_SCAN
)))
1540 /* check for not even having the fixed radiotap header part */
1541 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1542 goto fail
; /* too short to be possibly valid */
1544 /* is it a header version we can trust to find length from? */
1545 if (unlikely(prthdr
->it_version
))
1546 goto fail
; /* only version 0 is supported */
1548 /* then there must be a radiotap header with a length we can use */
1549 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1551 /* does the skb contain enough to deliver on the alleged length? */
1552 if (unlikely(skb
->len
< len_rthdr
))
1553 goto fail
; /* skb too short for claimed rt header extent */
1556 * fix up the pointers accounting for the radiotap
1557 * header still being in there. We are being given
1558 * a precooked IEEE80211 header so no need for
1561 skb_set_mac_header(skb
, len_rthdr
);
1563 * these are just fixed to the end of the rt area since we
1564 * don't have any better information and at this point, nobody cares
1566 skb_set_network_header(skb
, len_rthdr
);
1567 skb_set_transport_header(skb
, len_rthdr
);
1569 memset(info
, 0, sizeof(*info
));
1571 /* pass the radiotap header up to xmit */
1572 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1573 return NETDEV_TX_OK
;
1577 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1581 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1582 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1583 * @skb: packet to be sent
1584 * @dev: incoming interface
1586 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1587 * not be freed, and caller is responsible for either retrying later or freeing
1590 * This function takes in an Ethernet header and encapsulates it with suitable
1591 * IEEE 802.11 header based on which interface the packet is coming in. The
1592 * encapsulated packet will then be passed to master interface, wlan#.11, for
1593 * transmission (through low-level driver).
1595 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1596 struct net_device
*dev
)
1598 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1599 struct ieee80211_local
*local
= sdata
->local
;
1600 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1601 int ret
= NETDEV_TX_BUSY
, head_need
;
1602 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1604 struct ieee80211_hdr hdr
;
1605 struct ieee80211s_hdr mesh_hdr
;
1606 const u8
*encaps_data
;
1607 int encaps_len
, skip_header_bytes
;
1609 struct sta_info
*sta
;
1612 if (unlikely(skb
->len
< ETH_HLEN
)) {
1617 nh_pos
= skb_network_header(skb
) - skb
->data
;
1618 h_pos
= skb_transport_header(skb
) - skb
->data
;
1620 /* convert Ethernet header to proper 802.11 header (based on
1621 * operation mode) */
1622 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1623 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1625 switch (sdata
->vif
.type
) {
1626 case NL80211_IFTYPE_AP
:
1627 case NL80211_IFTYPE_AP_VLAN
:
1628 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1630 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1631 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1632 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1635 case NL80211_IFTYPE_WDS
:
1636 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1638 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1639 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1640 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1641 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1644 #ifdef CONFIG_MAC80211_MESH
1645 case NL80211_IFTYPE_MESH_POINT
:
1646 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1647 /* Do not send frames with mesh_ttl == 0 */
1648 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1653 if (compare_ether_addr(dev
->dev_addr
,
1654 skb
->data
+ ETH_ALEN
) == 0) {
1655 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1656 skb
->data
, skb
->data
+ ETH_ALEN
);
1657 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1658 sdata
, NULL
, NULL
, NULL
);
1660 /* packet from other interface */
1661 struct mesh_path
*mppath
;
1662 int is_mesh_mcast
= 1;
1666 if (is_multicast_ether_addr(skb
->data
))
1667 /* DA TA mSA AE:SA */
1668 mesh_da
= skb
->data
;
1670 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1672 /* RA TA mDA mSA AE:DA SA */
1673 mesh_da
= mppath
->mpp
;
1676 /* DA TA mSA AE:SA */
1677 mesh_da
= dev
->broadcast
;
1679 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1680 mesh_da
, dev
->dev_addr
);
1684 ieee80211_new_mesh_header(&mesh_hdr
,
1686 skb
->data
+ ETH_ALEN
,
1691 ieee80211_new_mesh_header(&mesh_hdr
,
1695 skb
->data
+ ETH_ALEN
);
1700 case NL80211_IFTYPE_STATION
:
1701 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1703 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1704 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1705 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1708 case NL80211_IFTYPE_ADHOC
:
1710 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1711 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1712 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1721 * There's no need to try to look up the destination
1722 * if it is a multicast address (which can only happen
1725 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1727 sta
= sta_info_get(local
, hdr
.addr1
);
1728 /* XXX: in the future, use sdata to look up the sta */
1729 if (sta
&& sta
->sdata
== sdata
)
1730 sta_flags
= get_sta_flags(sta
);
1734 /* receiver and we are QoS enabled, use a QoS type frame */
1735 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1736 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1741 * Drop unicast frames to unauthorised stations unless they are
1742 * EAPOL frames from the local station.
1744 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1745 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1746 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1747 !(ethertype
== ETH_P_PAE
&&
1748 compare_ether_addr(dev
->dev_addr
,
1749 skb
->data
+ ETH_ALEN
) == 0))) {
1750 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1751 if (net_ratelimit())
1752 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1753 " (unauthorized port)\n", dev
->name
,
1757 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1763 hdr
.frame_control
= fc
;
1764 hdr
.duration_id
= 0;
1767 skip_header_bytes
= ETH_HLEN
;
1768 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1769 encaps_data
= bridge_tunnel_header
;
1770 encaps_len
= sizeof(bridge_tunnel_header
);
1771 skip_header_bytes
-= 2;
1772 } else if (ethertype
>= 0x600) {
1773 encaps_data
= rfc1042_header
;
1774 encaps_len
= sizeof(rfc1042_header
);
1775 skip_header_bytes
-= 2;
1781 skb_pull(skb
, skip_header_bytes
);
1782 nh_pos
-= skip_header_bytes
;
1783 h_pos
-= skip_header_bytes
;
1785 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1788 * So we need to modify the skb header and hence need a copy of
1789 * that. The head_need variable above doesn't, so far, include
1790 * the needed header space that we don't need right away. If we
1791 * can, then we don't reallocate right now but only after the
1792 * frame arrives at the master device (if it does...)
1794 * If we cannot, however, then we will reallocate to include all
1795 * the ever needed space. Also, if we need to reallocate it anyway,
1796 * make it big enough for everything we may ever need.
1799 if (head_need
> 0 || skb_cloned(skb
)) {
1800 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1801 head_need
+= local
->tx_headroom
;
1802 head_need
= max_t(int, 0, head_need
);
1803 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1808 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1809 nh_pos
+= encaps_len
;
1810 h_pos
+= encaps_len
;
1813 if (meshhdrlen
> 0) {
1814 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1815 nh_pos
+= meshhdrlen
;
1816 h_pos
+= meshhdrlen
;
1819 if (ieee80211_is_data_qos(fc
)) {
1820 __le16
*qos_control
;
1822 qos_control
= (__le16
*) skb_push(skb
, 2);
1823 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1825 * Maybe we could actually set some fields here, for now just
1826 * initialise to zero to indicate no special operation.
1830 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1835 dev
->stats
.tx_packets
++;
1836 dev
->stats
.tx_bytes
+= skb
->len
;
1838 /* Update skb pointers to various headers since this modified frame
1839 * is going to go through Linux networking code that may potentially
1840 * need things like pointer to IP header. */
1841 skb_set_mac_header(skb
, 0);
1842 skb_set_network_header(skb
, nh_pos
);
1843 skb_set_transport_header(skb
, h_pos
);
1845 memset(info
, 0, sizeof(*info
));
1847 dev
->trans_start
= jiffies
;
1848 ieee80211_xmit(sdata
, skb
);
1850 return NETDEV_TX_OK
;
1853 if (ret
== NETDEV_TX_OK
)
1861 * ieee80211_clear_tx_pending may not be called in a context where
1862 * it is possible that it packets could come in again.
1864 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1868 for (i
= 0; i
< local
->hw
.queues
; i
++)
1869 skb_queue_purge(&local
->pending
[i
]);
1872 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1873 struct sk_buff
*skb
)
1875 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1876 struct ieee80211_sub_if_data
*sdata
;
1877 struct sta_info
*sta
;
1878 struct ieee80211_hdr
*hdr
;
1882 sdata
= vif_to_sdata(info
->control
.vif
);
1884 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1885 ieee80211_tx(sdata
, skb
, true);
1887 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1888 sta
= sta_info_get(local
, hdr
->addr1
);
1890 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
1891 if (ret
!= IEEE80211_TX_OK
)
1899 * Transmit all pending packets. Called from tasklet.
1901 void ieee80211_tx_pending(unsigned long data
)
1903 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1904 unsigned long flags
;
1910 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1911 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1913 * If queue is stopped by something other than due to pending
1914 * frames, or we have no pending frames, proceed to next queue.
1916 if (local
->queue_stop_reasons
[i
] ||
1917 skb_queue_empty(&local
->pending
[i
]))
1920 while (!skb_queue_empty(&local
->pending
[i
])) {
1921 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
1922 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1923 struct ieee80211_sub_if_data
*sdata
;
1925 if (WARN_ON(!info
->control
.vif
)) {
1930 sdata
= vif_to_sdata(info
->control
.vif
);
1931 dev_hold(sdata
->dev
);
1932 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1935 txok
= ieee80211_tx_pending_skb(local
, skb
);
1936 dev_put(sdata
->dev
);
1938 __skb_queue_head(&local
->pending
[i
], skb
);
1939 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
1945 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1950 /* functions for drivers to get certain frames */
1952 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1953 struct sk_buff
*skb
,
1954 struct beacon_data
*beacon
)
1958 int i
, have_bits
= 0, n1
, n2
;
1960 /* Generate bitmap for TIM only if there are any STAs in power save
1962 if (atomic_read(&bss
->num_sta_ps
) > 0)
1963 /* in the hope that this is faster than
1964 * checking byte-for-byte */
1965 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1966 IEEE80211_MAX_AID
+1);
1968 if (bss
->dtim_count
== 0)
1969 bss
->dtim_count
= beacon
->dtim_period
- 1;
1973 tim
= pos
= (u8
*) skb_put(skb
, 6);
1974 *pos
++ = WLAN_EID_TIM
;
1976 *pos
++ = bss
->dtim_count
;
1977 *pos
++ = beacon
->dtim_period
;
1979 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1983 /* Find largest even number N1 so that bits numbered 1 through
1984 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1985 * (N2 + 1) x 8 through 2007 are 0. */
1987 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1994 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2001 /* Bitmap control */
2003 /* Part Virt Bitmap */
2004 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2006 tim
[1] = n2
- n1
+ 4;
2007 skb_put(skb
, n2
- n1
);
2009 *pos
++ = aid0
; /* Bitmap control */
2010 *pos
++ = 0; /* Part Virt Bitmap */
2014 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2015 struct ieee80211_vif
*vif
,
2016 u16
*tim_offset
, u16
*tim_length
)
2018 struct ieee80211_local
*local
= hw_to_local(hw
);
2019 struct sk_buff
*skb
= NULL
;
2020 struct ieee80211_tx_info
*info
;
2021 struct ieee80211_sub_if_data
*sdata
= NULL
;
2022 struct ieee80211_if_ap
*ap
= NULL
;
2023 struct beacon_data
*beacon
;
2024 struct ieee80211_supported_band
*sband
;
2025 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2027 sband
= local
->hw
.wiphy
->bands
[band
];
2031 sdata
= vif_to_sdata(vif
);
2038 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2040 beacon
= rcu_dereference(ap
->beacon
);
2043 * headroom, head length,
2044 * tail length and maximum TIM length
2046 skb
= dev_alloc_skb(local
->tx_headroom
+
2048 beacon
->tail_len
+ 256);
2052 skb_reserve(skb
, local
->tx_headroom
);
2053 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2057 * Not very nice, but we want to allow the driver to call
2058 * ieee80211_beacon_get() as a response to the set_tim()
2059 * callback. That, however, is already invoked under the
2060 * sta_lock to guarantee consistent and race-free update
2061 * of the tim bitmap in mac80211 and the driver.
2063 if (local
->tim_in_locked_section
) {
2064 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2066 unsigned long flags
;
2068 spin_lock_irqsave(&local
->sta_lock
, flags
);
2069 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2070 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2074 *tim_offset
= beacon
->head_len
;
2076 *tim_length
= skb
->len
- beacon
->head_len
;
2079 memcpy(skb_put(skb
, beacon
->tail_len
),
2080 beacon
->tail
, beacon
->tail_len
);
2083 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2084 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2085 struct ieee80211_hdr
*hdr
;
2086 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2091 skb
= skb_copy(presp
, GFP_ATOMIC
);
2095 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2096 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2097 IEEE80211_STYPE_BEACON
);
2098 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2099 struct ieee80211_mgmt
*mgmt
;
2102 /* headroom, head length, tail length and maximum TIM length */
2103 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2107 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2108 mgmt
= (struct ieee80211_mgmt
*)
2109 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2110 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2111 mgmt
->frame_control
=
2112 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2113 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2114 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2115 /* BSSID is left zeroed, wildcard value */
2116 mgmt
->u
.beacon
.beacon_int
=
2117 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2118 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2120 pos
= skb_put(skb
, 2);
2121 *pos
++ = WLAN_EID_SSID
;
2124 mesh_mgmt_ies_add(skb
, sdata
);
2130 info
= IEEE80211_SKB_CB(skb
);
2132 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2135 * XXX: For now, always use the lowest rate
2137 info
->control
.rates
[0].idx
= 0;
2138 info
->control
.rates
[0].count
= 1;
2139 info
->control
.rates
[1].idx
= -1;
2140 info
->control
.rates
[2].idx
= -1;
2141 info
->control
.rates
[3].idx
= -1;
2142 info
->control
.rates
[4].idx
= -1;
2143 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2145 info
->control
.vif
= vif
;
2147 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2148 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2149 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2154 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2156 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2157 const void *frame
, size_t frame_len
,
2158 const struct ieee80211_tx_info
*frame_txctl
,
2159 struct ieee80211_rts
*rts
)
2161 const struct ieee80211_hdr
*hdr
= frame
;
2163 rts
->frame_control
=
2164 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2165 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2167 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2168 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2170 EXPORT_SYMBOL(ieee80211_rts_get
);
2172 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2173 const void *frame
, size_t frame_len
,
2174 const struct ieee80211_tx_info
*frame_txctl
,
2175 struct ieee80211_cts
*cts
)
2177 const struct ieee80211_hdr
*hdr
= frame
;
2179 cts
->frame_control
=
2180 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2181 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2182 frame_len
, frame_txctl
);
2183 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2185 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2188 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2189 struct ieee80211_vif
*vif
)
2191 struct ieee80211_local
*local
= hw_to_local(hw
);
2192 struct sk_buff
*skb
= NULL
;
2193 struct sta_info
*sta
;
2194 struct ieee80211_tx_data tx
;
2195 struct ieee80211_sub_if_data
*sdata
;
2196 struct ieee80211_if_ap
*bss
= NULL
;
2197 struct beacon_data
*beacon
;
2198 struct ieee80211_tx_info
*info
;
2200 sdata
= vif_to_sdata(vif
);
2204 beacon
= rcu_dereference(bss
->beacon
);
2206 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2209 if (bss
->dtim_count
!= 0)
2210 goto out
; /* send buffered bc/mc only after DTIM beacon */
2213 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2216 local
->total_ps_buffered
--;
2218 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2219 struct ieee80211_hdr
*hdr
=
2220 (struct ieee80211_hdr
*) skb
->data
;
2221 /* more buffered multicast/broadcast frames ==> set
2222 * MoreData flag in IEEE 802.11 header to inform PS
2224 hdr
->frame_control
|=
2225 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2228 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2230 dev_kfree_skb_any(skb
);
2233 info
= IEEE80211_SKB_CB(skb
);
2236 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2237 tx
.channel
= local
->hw
.conf
.channel
;
2238 info
->band
= tx
.channel
->band
;
2240 if (invoke_tx_handlers(&tx
))
2247 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2249 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
2252 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2253 skb_set_mac_header(skb
, 0);
2254 skb_set_network_header(skb
, 0);
2255 skb_set_transport_header(skb
, 0);
2258 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2261 * The other path calling ieee80211_xmit is from the tasklet,
2262 * and while we can handle concurrent transmissions locking
2263 * requirements are that we do not come into tx with bhs on.
2266 ieee80211_xmit(sdata
, skb
);