2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_PENDING 2
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
49 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
51 /* assume HW handles this */
52 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
56 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
59 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
60 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
62 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
65 * data and mgmt (except PS Poll):
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
81 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
82 if (ieee80211_is_ctl(hdr
->frame_control
)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
95 * PS Poll: BIT(15) | BIT(14) | aid
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr
) /* Group address as the destination - no ACK */
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
118 /* use lowest available if everything fails */
119 mrate
= sband
->bitrates
[0].bitrate
;
120 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
121 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
123 if (r
->bitrate
> txrate
->bitrate
)
126 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
129 switch (sband
->band
) {
130 case IEEE80211_BAND_2GHZ
: {
132 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
133 flag
= IEEE80211_RATE_MANDATORY_G
;
135 flag
= IEEE80211_RATE_MANDATORY_B
;
140 case IEEE80211_BAND_5GHZ
:
141 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
144 case IEEE80211_NUM_BANDS
:
150 /* No matching basic rate found; use highest suitable mandatory
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
160 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur
*= 2; /* ACK + SIFS */
167 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
168 txrate
->bitrate
, erp
,
169 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
172 return cpu_to_le16(dur
);
175 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
176 struct net_device
*dev
)
178 return local
== wdev_priv(dev
->ieee80211_ptr
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
187 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
188 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
191 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
194 if (unlikely(tx
->local
->sw_scanning
) &&
195 !ieee80211_is_probe_req(hdr
->frame_control
) &&
196 !ieee80211_is_nullfunc(hdr
->frame_control
))
198 * When software scanning only nullfunc frames (to notify
199 * the sleep state to the AP) and probe requests (for the
200 * active scan) are allowed, all other frames should not be
201 * sent and we should not get here, but if we do
202 * nonetheless, drop them to avoid sending them
203 * off-channel. See the link below and
204 * ieee80211_start_scan() for more.
206 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
210 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
213 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
216 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
218 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
219 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
220 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
221 ieee80211_is_data(hdr
->frame_control
))) {
222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
223 printk(KERN_DEBUG
"%s: dropped data frame to not "
224 "associated station %pM\n",
225 tx
->dev
->name
, hdr
->addr1
);
226 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
227 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
231 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
232 tx
->local
->num_sta
== 0 &&
233 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
235 * No associated STAs - no need to send multicast
246 /* This function is called whenever the AP is about to exceed the maximum limit
247 * of buffered frames for power saving STAs. This situation should not really
248 * happen often during normal operation, so dropping the oldest buffered packet
249 * from each queue should be OK to make some room for new frames. */
250 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
252 int total
= 0, purged
= 0;
254 struct ieee80211_sub_if_data
*sdata
;
255 struct sta_info
*sta
;
258 * virtual interfaces are protected by RCU
262 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
263 struct ieee80211_if_ap
*ap
;
264 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
267 skb
= skb_dequeue(&ap
->ps_bc_buf
);
272 total
+= skb_queue_len(&ap
->ps_bc_buf
);
275 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
276 skb
= skb_dequeue(&sta
->ps_tx_buf
);
281 total
+= skb_queue_len(&sta
->ps_tx_buf
);
286 local
->total_ps_buffered
= total
;
287 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
288 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
289 wiphy_name(local
->hw
.wiphy
), purged
);
293 static ieee80211_tx_result
294 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
296 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
297 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
300 * broadcast/multicast frame
302 * If any of the associated stations is in power save mode,
303 * the frame is buffered to be sent after DTIM beacon frame.
304 * This is done either by the hardware or us.
307 /* powersaving STAs only in AP/VLAN mode */
311 /* no buffering for ordered frames */
312 if (ieee80211_has_order(hdr
->frame_control
))
315 /* no stations in PS mode */
316 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
319 /* buffered in mac80211 */
320 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
321 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
322 purge_old_ps_buffers(tx
->local
);
323 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
325 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
326 if (net_ratelimit()) {
327 printk(KERN_DEBUG
"%s: BC TX buffer full - "
328 "dropping the oldest frame\n",
332 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
334 tx
->local
->total_ps_buffered
++;
335 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
339 /* buffered in hardware */
340 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
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
)))
372 staflags
= get_sta_flags(sta
);
374 if (unlikely((staflags
& WLAN_STA_PS
) &&
375 !(staflags
& WLAN_STA_PSPOLL
))) {
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
379 sta
->sta
.addr
, sta
->sta
.aid
,
380 skb_queue_len(&sta
->ps_tx_buf
));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
383 purge_old_ps_buffers(tx
->local
);
384 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
385 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
386 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG
"%s: STA %pM TX "
389 "buffer full - dropping oldest frame\n",
390 tx
->dev
->name
, sta
->sta
.addr
);
395 tx
->local
->total_ps_buffered
++;
397 /* Queue frame to be sent after STA sends an PS Poll frame */
398 if (skb_queue_empty(&sta
->ps_tx_buf
))
399 sta_info_set_tim_bit(sta
);
401 info
->control
.jiffies
= jiffies
;
402 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
405 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
406 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
407 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
408 "set -> send frame\n", tx
->dev
->name
,
411 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
412 if (test_and_clear_sta_flags(sta
, WLAN_STA_PSPOLL
)) {
414 * The sleeping station with pending data is now snoozing.
415 * It queried us for its buffered frames and will go back
416 * to deep sleep once it got everything.
418 * inform the driver, in case the hardware does powersave
419 * frame filtering and keeps a station blacklist on its own
420 * (e.g: p54), so that frames can be delivered unimpeded.
422 * Note: It should be save to disable the filter now.
423 * As, it is really unlikely that we still have any pending
424 * frame for this station in the hw's buffers/fifos left,
425 * that is not rejected with a unsuccessful tx_status yet.
428 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
433 static ieee80211_tx_result debug_noinline
434 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
436 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
439 if (tx
->flags
& IEEE80211_TX_UNICAST
)
440 return ieee80211_tx_h_unicast_ps_buf(tx
);
442 return ieee80211_tx_h_multicast_ps_buf(tx
);
445 static ieee80211_tx_result debug_noinline
446 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
448 struct ieee80211_key
*key
;
449 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
450 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
452 if (unlikely(tx
->skb
->do_not_encrypt
))
454 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
456 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
457 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
459 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
461 else if (tx
->sdata
->drop_unencrypted
&&
462 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
463 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
464 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
465 (ieee80211_is_action(hdr
->frame_control
) &&
466 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
467 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
473 tx
->key
->tx_rx_count
++;
474 /* TODO: add threshold stuff again */
476 switch (tx
->key
->conf
.alg
) {
478 if (ieee80211_is_auth(hdr
->frame_control
))
481 if (!ieee80211_is_data_present(hdr
->frame_control
))
485 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
486 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
491 if (!ieee80211_is_mgmt(hdr
->frame_control
))
497 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
498 tx
->skb
->do_not_encrypt
= 1;
503 static ieee80211_tx_result debug_noinline
504 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
506 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
507 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
508 struct ieee80211_supported_band
*sband
;
509 struct ieee80211_rate
*rate
;
511 bool inval
= false, rts
= false, short_preamble
= false;
512 struct ieee80211_tx_rate_control txrc
;
514 memset(&txrc
, 0, sizeof(txrc
));
516 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
518 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
519 tx
->local
->hw
.wiphy
->frag_threshold
);
521 /* set up the tx rate control struct we give the RC algo */
522 txrc
.hw
= local_to_hw(tx
->local
);
524 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
526 txrc
.reported_rate
.idx
= -1;
527 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
529 /* set up RTS protection if desired */
530 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
531 txrc
.rts
= rts
= true;
535 * Use short preamble if the BSS can handle it, but not for
536 * management frames unless we know the receiver can handle
537 * that -- the management frame might be to a station that
538 * just wants a probe response.
540 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
541 (ieee80211_is_data(hdr
->frame_control
) ||
542 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
543 txrc
.short_preamble
= short_preamble
= true;
546 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
548 if (unlikely(info
->control
.rates
[0].idx
< 0))
551 if (txrc
.reported_rate
.idx
< 0)
552 txrc
.reported_rate
= info
->control
.rates
[0];
555 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
557 if (unlikely(!info
->control
.rates
[0].count
))
558 info
->control
.rates
[0].count
= 1;
560 if (is_multicast_ether_addr(hdr
->addr1
)) {
562 * XXX: verify the rate is in the basic rateset
568 * set up the RTS/CTS rate as the fastest basic rate
569 * that is not faster than the data rate
571 * XXX: Should this check all retry rates?
573 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
576 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
578 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
579 /* must be a basic rate */
580 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
582 /* must not be faster than the data rate */
583 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
586 if (sband
->bitrates
[baserate
].bitrate
<
587 sband
->bitrates
[i
].bitrate
)
591 info
->control
.rts_cts_rate_idx
= baserate
;
594 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
596 * make sure there's no valid rate following
597 * an invalid one, just in case drivers don't
598 * take the API seriously to stop at -1.
601 info
->control
.rates
[i
].idx
= -1;
604 if (info
->control
.rates
[i
].idx
< 0) {
610 * For now assume MCS is already set up correctly, this
613 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
614 WARN_ON(info
->control
.rates
[i
].idx
> 76);
618 /* set up RTS protection if desired */
620 info
->control
.rates
[i
].flags
|=
621 IEEE80211_TX_RC_USE_RTS_CTS
;
624 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
625 sband
->n_bitrates
)) {
626 info
->control
.rates
[i
].idx
= -1;
630 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
632 /* set up short preamble */
633 if (short_preamble
&&
634 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
635 info
->control
.rates
[i
].flags
|=
636 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
638 /* set up G protection */
639 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
640 rate
->flags
& IEEE80211_RATE_ERP_G
)
641 info
->control
.rates
[i
].flags
|=
642 IEEE80211_TX_RC_USE_CTS_PROTECT
;
648 static ieee80211_tx_result debug_noinline
649 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
651 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
654 info
->control
.sta
= &tx
->sta
->sta
;
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
662 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
663 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
669 * Packet injection may want to control the sequence
670 * number, if we have no matching interface then we
671 * neither assign one ourselves nor ask the driver to.
673 if (unlikely(!info
->control
.vif
))
676 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
679 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
683 * Anything but QoS data that has a sequence number field
684 * (is long enough) gets a sequence number from the global
687 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
688 /* driver should assign sequence number */
689 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
690 /* for pure STA mode without beacons, we can do it */
691 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
692 tx
->sdata
->sequence_number
+= 0x10;
693 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
698 * This should be true for injected/management frames only, for
699 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
700 * above since they are not QoS-data frames.
705 /* include per-STA, per-TID sequence counter */
707 qc
= ieee80211_get_qos_ctl(hdr
);
708 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
709 seq
= &tx
->sta
->tid_seq
[tid
];
711 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
713 /* Increase the sequence number. */
714 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
719 static int ieee80211_fragment(struct ieee80211_local
*local
,
720 struct sk_buff
*skb
, int hdrlen
,
723 struct sk_buff
*tail
= skb
, *tmp
;
724 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
725 int pos
= hdrlen
+ per_fragm
;
726 int rem
= skb
->len
- hdrlen
- per_fragm
;
728 if (WARN_ON(rem
< 0))
732 int fraglen
= per_fragm
;
737 tmp
= dev_alloc_skb(local
->tx_headroom
+
739 IEEE80211_ENCRYPT_HEADROOM
+
740 IEEE80211_ENCRYPT_TAILROOM
);
745 skb_reserve(tmp
, local
->tx_headroom
+
746 IEEE80211_ENCRYPT_HEADROOM
);
747 /* copy control information */
748 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
749 skb_copy_queue_mapping(tmp
, skb
);
750 tmp
->priority
= skb
->priority
;
751 tmp
->do_not_encrypt
= skb
->do_not_encrypt
;
755 /* copy header and data */
756 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
757 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
762 skb
->len
= hdrlen
+ per_fragm
;
766 static ieee80211_tx_result debug_noinline
767 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
769 struct sk_buff
*skb
= tx
->skb
;
770 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
771 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
772 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
776 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
780 * Warn when submitting a fragmented A-MPDU frame and drop it.
781 * This scenario is handled in __ieee80211_tx_prepare but extra
782 * caution taken here as fragmented ampdu may cause Tx stop.
784 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
787 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
789 /* internal error, why is TX_FRAGMENTED set? */
790 if (WARN_ON(skb
->len
<= frag_threshold
))
794 * Now fragment the frame. This will allocate all the fragments and
795 * chain them (using skb as the first fragment) to skb->next.
796 * During transmission, we will remove the successfully transmitted
797 * fragments from this list. When the low-level driver rejects one
798 * of the fragments then we will simply pretend to accept the skb
799 * but store it away as pending.
801 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
804 /* update duration/seq/flags of fragments */
808 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
810 hdr
= (void *)skb
->data
;
811 info
= IEEE80211_SKB_CB(skb
);
814 hdr
->frame_control
|= morefrags
;
815 next_len
= skb
->next
->len
;
817 * No multi-rate retries for fragmented frames, that
818 * would completely throw off the NAV at other STAs.
820 info
->control
.rates
[1].idx
= -1;
821 info
->control
.rates
[2].idx
= -1;
822 info
->control
.rates
[3].idx
= -1;
823 info
->control
.rates
[4].idx
= -1;
824 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
825 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
827 hdr
->frame_control
&= ~morefrags
;
830 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
831 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
833 } while ((skb
= skb
->next
));
838 static ieee80211_tx_result debug_noinline
839 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
844 switch (tx
->key
->conf
.alg
) {
846 return ieee80211_crypto_wep_encrypt(tx
);
848 return ieee80211_crypto_tkip_encrypt(tx
);
850 return ieee80211_crypto_ccmp_encrypt(tx
);
852 return ieee80211_crypto_aes_cmac_encrypt(tx
);
860 static ieee80211_tx_result debug_noinline
861 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
863 struct sk_buff
*skb
= tx
->skb
;
864 struct ieee80211_hdr
*hdr
;
869 hdr
= (void *) skb
->data
;
870 next_len
= skb
->next
? skb
->next
->len
: 0;
871 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
874 ieee80211_duration(tx
, group_addr
, next_len
);
875 } while ((skb
= skb
->next
));
880 static ieee80211_tx_result debug_noinline
881 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
883 struct sk_buff
*skb
= tx
->skb
;
888 tx
->sta
->tx_packets
++;
890 tx
->sta
->tx_fragments
++;
891 tx
->sta
->tx_bytes
+= skb
->len
;
892 } while ((skb
= skb
->next
));
897 /* actual transmit path */
900 * deal with packet injection down monitor interface
901 * with Radiotap Header -- only called for monitor mode interface
903 static ieee80211_tx_result
904 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
908 * this is the moment to interpret and discard the radiotap header that
909 * must be at the start of the packet injected in Monitor mode
911 * Need to take some care with endian-ness since radiotap
912 * args are little-endian
915 struct ieee80211_radiotap_iterator iterator
;
916 struct ieee80211_radiotap_header
*rthdr
=
917 (struct ieee80211_radiotap_header
*) skb
->data
;
918 struct ieee80211_supported_band
*sband
;
919 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
921 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
923 skb
->do_not_encrypt
= 1;
924 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
927 * for every radiotap entry that is present
928 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
929 * entries present, or -EINVAL on error)
933 ret
= ieee80211_radiotap_iterator_next(&iterator
);
938 /* see if this argument is something we can use */
939 switch (iterator
.this_arg_index
) {
941 * You must take care when dereferencing iterator.this_arg
942 * for multibyte types... the pointer is not aligned. Use
943 * get_unaligned((type *)iterator.this_arg) to dereference
944 * iterator.this_arg for type "type" safely on all arches.
946 case IEEE80211_RADIOTAP_FLAGS
:
947 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
949 * this indicates that the skb we have been
950 * handed has the 32-bit FCS CRC at the end...
951 * we should react to that by snipping it off
952 * because it will be recomputed and added
955 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
958 skb_trim(skb
, skb
->len
- FCS_LEN
);
960 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
961 tx
->skb
->do_not_encrypt
= 0;
962 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
963 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
967 * Please update the file
968 * Documentation/networking/mac80211-injection.txt
969 * when parsing new fields here.
977 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
981 * remove the radiotap header
982 * iterator->max_length was sanity-checked against
983 * skb->len by iterator init
985 skb_pull(skb
, iterator
.max_length
);
993 static ieee80211_tx_result
994 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
996 struct net_device
*dev
)
998 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
999 struct ieee80211_hdr
*hdr
;
1000 struct ieee80211_sub_if_data
*sdata
;
1001 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1004 bool queued
= false;
1006 memset(tx
, 0, sizeof(*tx
));
1008 tx
->dev
= dev
; /* use original interface */
1010 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1011 tx
->channel
= local
->hw
.conf
.channel
;
1013 * Set this flag (used below to indicate "automatic fragmentation"),
1014 * it will be cleared/left by radiotap as desired.
1016 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1018 /* process and remove the injection radiotap header */
1019 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1020 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1021 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
1025 * __ieee80211_parse_tx_radiotap has now removed
1026 * the radiotap header that was present and pre-filled
1027 * 'tx' with tx control information.
1032 * If this flag is set to true anywhere, and we get here,
1033 * we are doing the needed processing, so remove the flag
1036 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1038 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1040 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1042 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1043 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1044 unsigned long flags
;
1045 struct tid_ampdu_tx
*tid_tx
;
1047 qc
= ieee80211_get_qos_ctl(hdr
);
1048 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1050 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1052 * XXX: This spinlock could be fairly expensive, but see the
1053 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1054 * One way to solve this would be to do something RCU-like
1055 * for managing the tid_tx struct and using atomic bitops
1056 * for the actual state -- by introducing an actual
1057 * 'operational' bit that would be possible. It would
1058 * require changing ieee80211_agg_tx_operational() to
1059 * set that bit, and changing the way tid_tx is managed
1060 * everywhere, including races between that bit and
1061 * tid_tx going away (tid_tx being added can be easily
1062 * committed to memory before the 'operational' bit).
1064 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1065 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1066 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1067 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1068 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1071 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1072 __skb_queue_tail(&tid_tx
->pending
, skb
);
1074 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1076 if (unlikely(queued
))
1080 if (is_multicast_ether_addr(hdr
->addr1
)) {
1081 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1082 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1084 tx
->flags
|= IEEE80211_TX_UNICAST
;
1085 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1088 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1089 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1090 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1091 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1092 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1094 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1098 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1099 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1100 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1102 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1103 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1104 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1105 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1107 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1113 * NB: @tx is uninitialised when passed in here
1115 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1116 struct ieee80211_tx_data
*tx
,
1117 struct sk_buff
*skb
)
1119 struct net_device
*dev
;
1121 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1122 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1129 * initialises tx with control
1131 * return value is safe to ignore here because this function
1132 * can only be invoked for multicast frames
1136 __ieee80211_tx_prepare(tx
, skb
, dev
);
1141 static int __ieee80211_tx(struct ieee80211_local
*local
,
1142 struct sk_buff
**skbp
,
1143 struct sta_info
*sta
)
1145 struct sk_buff
*skb
= *skbp
, *next
;
1146 struct ieee80211_tx_info
*info
;
1150 local
->mdev
->trans_start
= jiffies
;
1153 if (ieee80211_queue_stopped(&local
->hw
,
1154 skb_get_queue_mapping(skb
)))
1155 return IEEE80211_TX_PENDING
;
1157 info
= IEEE80211_SKB_CB(skb
);
1160 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1161 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1165 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1166 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1170 if (ret
!= NETDEV_TX_OK
)
1171 return IEEE80211_TX_AGAIN
;
1173 ieee80211_led_tx(local
, 1);
1177 return IEEE80211_TX_OK
;
1181 * Invoke TX handlers, return 0 on success and non-zero if the
1182 * frame was dropped or queued.
1184 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1186 struct sk_buff
*skb
= tx
->skb
;
1187 ieee80211_tx_result res
= TX_DROP
;
1189 #define CALL_TXH(txh) \
1191 if (res != TX_CONTINUE) \
1194 CALL_TXH(ieee80211_tx_h_check_assoc
)
1195 CALL_TXH(ieee80211_tx_h_ps_buf
)
1196 CALL_TXH(ieee80211_tx_h_select_key
)
1197 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1198 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1199 CALL_TXH(ieee80211_tx_h_misc
)
1200 CALL_TXH(ieee80211_tx_h_sequence
)
1201 CALL_TXH(ieee80211_tx_h_fragment
)
1202 /* handlers after fragment must be aware of tx info fragmentation! */
1203 CALL_TXH(ieee80211_tx_h_encrypt
)
1204 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1205 CALL_TXH(ieee80211_tx_h_stats
)
1209 if (unlikely(res
== TX_DROP
)) {
1210 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1212 struct sk_buff
*next
;
1219 } else if (unlikely(res
== TX_QUEUED
)) {
1220 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1227 static void ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1230 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1231 struct sta_info
*sta
;
1232 struct ieee80211_tx_data tx
;
1233 ieee80211_tx_result res_prepare
;
1234 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1235 struct sk_buff
*next
;
1236 unsigned long flags
;
1240 queue
= skb_get_queue_mapping(skb
);
1242 WARN_ON(!txpending
&& !skb_queue_empty(&local
->pending
[queue
]));
1244 if (unlikely(skb
->len
< 10)) {
1251 /* initialises tx */
1252 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1254 if (unlikely(res_prepare
== TX_DROP
)) {
1258 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1264 tx
.channel
= local
->hw
.conf
.channel
;
1265 info
->band
= tx
.channel
->band
;
1267 if (invoke_tx_handlers(&tx
))
1272 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
);
1274 case IEEE80211_TX_OK
:
1276 case IEEE80211_TX_AGAIN
:
1278 * Since there are no fragmented frames on A-MPDU
1279 * queues, there's no reason for a driver to reject
1280 * a frame there, warn and drop it.
1282 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1285 case IEEE80211_TX_PENDING
:
1288 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1290 if (__netif_subqueue_stopped(local
->mdev
, queue
)) {
1294 if (unlikely(txpending
))
1295 skb_queue_head(&local
->pending
[queue
],
1298 skb_queue_tail(&local
->pending
[queue
],
1300 } while ((skb
= next
));
1303 * Make sure nobody will enable the queue on us
1304 * (without going through the tasklet) nor disable the
1305 * netdev queue underneath the pending handling code.
1307 __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING
,
1308 &local
->queue_stop_reasons
[queue
]);
1310 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1313 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1317 if (WARN(retries
> 10, "tx refused but queue active"))
1337 /* device xmit handlers */
1339 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1340 struct sk_buff
*skb
,
1341 int head_need
, bool may_encrypt
)
1346 * This could be optimised, devices that do full hardware
1347 * crypto (including TKIP MMIC) need no tailroom... But we
1348 * have no drivers for such devices currently.
1351 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1352 tail_need
-= skb_tailroom(skb
);
1353 tail_need
= max_t(int, tail_need
, 0);
1356 if (head_need
|| tail_need
) {
1357 /* Sorry. Can't account for this any more */
1361 if (skb_header_cloned(skb
))
1362 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1364 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1366 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1367 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1368 wiphy_name(local
->hw
.wiphy
));
1372 /* update truesize too */
1373 skb
->truesize
+= head_need
+ tail_need
;
1378 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1380 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1381 struct ieee80211_local
*local
= mpriv
->local
;
1382 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1383 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1384 struct net_device
*odev
= NULL
;
1385 struct ieee80211_sub_if_data
*osdata
;
1392 } monitor_iface
= NOT_MONITOR
;
1395 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1396 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1400 if (unlikely(!odev
)) {
1401 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1402 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1403 "originating device\n", dev
->name
);
1406 return NETDEV_TX_OK
;
1409 if ((local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
) &&
1410 local
->hw
.conf
.dynamic_ps_timeout
> 0) {
1411 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1412 ieee80211_stop_queues_by_reason(&local
->hw
,
1413 IEEE80211_QUEUE_STOP_REASON_PS
);
1414 queue_work(local
->hw
.workqueue
,
1415 &local
->dynamic_ps_disable_work
);
1418 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1419 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1422 memset(info
, 0, sizeof(*info
));
1424 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1426 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1428 if (ieee80211_vif_is_mesh(&osdata
->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
, osdata
)) {
1435 return NETDEV_TX_OK
;
1437 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1438 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1440 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1441 struct ieee80211_sub_if_data
*sdata
;
1445 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1446 monitor_iface
= UNKNOWN_ADDRESS
;
1448 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1449 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1450 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1452 /* check the header is complete in the frame */
1453 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1455 * We process outgoing injected frames that have a
1456 * local address we handle as though they are our
1458 * This code here isn't entirely correct, the local
1459 * MAC address is not necessarily enough to find
1460 * the interface to use; for that proper VLAN/WDS
1461 * support we will need a different mechanism.
1465 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1467 if (!netif_running(sdata
->dev
))
1469 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1471 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1473 dev_hold(sdata
->dev
);
1477 skb
->iif
= sdata
->dev
->ifindex
;
1478 monitor_iface
= FOUND_SDATA
;
1486 may_encrypt
= !skb
->do_not_encrypt
;
1488 headroom
= osdata
->local
->tx_headroom
;
1490 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1491 headroom
-= skb_headroom(skb
);
1492 headroom
= max_t(int, 0, headroom
);
1494 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1497 return NETDEV_TX_OK
;
1500 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1501 osdata
= container_of(osdata
->bss
,
1502 struct ieee80211_sub_if_data
,
1504 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1505 info
->control
.vif
= &osdata
->vif
;
1507 ieee80211_tx(odev
, skb
, false);
1510 return NETDEV_TX_OK
;
1513 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1514 struct net_device
*dev
)
1516 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1517 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1518 struct ieee80211_radiotap_header
*prthdr
=
1519 (struct ieee80211_radiotap_header
*)skb
->data
;
1523 * Frame injection is not allowed if beaconing is not allowed
1524 * or if we need radar detection. Beaconing is usually not allowed when
1525 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1526 * Passive scan is also used in world regulatory domains where
1527 * your country is not known and as such it should be treated as
1528 * NO TX unless the channel is explicitly allowed in which case
1529 * your current regulatory domain would not have the passive scan
1532 * Since AP mode uses monitor interfaces to inject/TX management
1533 * frames we can make AP mode the exception to this rule once it
1534 * supports radar detection as its implementation can deal with
1535 * radar detection by itself. We can do that later by adding a
1536 * monitor flag interfaces used for AP support.
1538 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1539 IEEE80211_CHAN_PASSIVE_SCAN
)))
1542 /* check for not even having the fixed radiotap header part */
1543 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1544 goto fail
; /* too short to be possibly valid */
1546 /* is it a header version we can trust to find length from? */
1547 if (unlikely(prthdr
->it_version
))
1548 goto fail
; /* only version 0 is supported */
1550 /* then there must be a radiotap header with a length we can use */
1551 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1553 /* does the skb contain enough to deliver on the alleged length? */
1554 if (unlikely(skb
->len
< len_rthdr
))
1555 goto fail
; /* skb too short for claimed rt header extent */
1557 skb
->dev
= local
->mdev
;
1559 /* needed because we set skb device to master */
1560 skb
->iif
= dev
->ifindex
;
1562 /* sometimes we do encrypt injected frames, will be fixed
1563 * up in radiotap parser if not wanted */
1564 skb
->do_not_encrypt
= 0;
1567 * fix up the pointers accounting for the radiotap
1568 * header still being in there. We are being given
1569 * a precooked IEEE80211 header so no need for
1572 skb_set_mac_header(skb
, len_rthdr
);
1574 * these are just fixed to the end of the rt area since we
1575 * don't have any better information and at this point, nobody cares
1577 skb_set_network_header(skb
, len_rthdr
);
1578 skb_set_transport_header(skb
, len_rthdr
);
1580 /* pass the radiotap header up to the next stage intact */
1581 dev_queue_xmit(skb
);
1582 return NETDEV_TX_OK
;
1586 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1590 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1591 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1592 * @skb: packet to be sent
1593 * @dev: incoming interface
1595 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1596 * not be freed, and caller is responsible for either retrying later or freeing
1599 * This function takes in an Ethernet header and encapsulates it with suitable
1600 * IEEE 802.11 header based on which interface the packet is coming in. The
1601 * encapsulated packet will then be passed to master interface, wlan#.11, for
1602 * transmission (through low-level driver).
1604 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1605 struct net_device
*dev
)
1607 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1608 struct ieee80211_local
*local
= sdata
->local
;
1609 int ret
= 1, head_need
;
1610 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1612 struct ieee80211_hdr hdr
;
1613 struct ieee80211s_hdr mesh_hdr
;
1614 const u8
*encaps_data
;
1615 int encaps_len
, skip_header_bytes
;
1617 struct sta_info
*sta
;
1620 if (unlikely(skb
->len
< ETH_HLEN
)) {
1625 nh_pos
= skb_network_header(skb
) - skb
->data
;
1626 h_pos
= skb_transport_header(skb
) - skb
->data
;
1628 /* convert Ethernet header to proper 802.11 header (based on
1629 * operation mode) */
1630 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1631 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1633 switch (sdata
->vif
.type
) {
1634 case NL80211_IFTYPE_AP
:
1635 case NL80211_IFTYPE_AP_VLAN
:
1636 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1638 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1639 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1640 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1643 case NL80211_IFTYPE_WDS
:
1644 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1646 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1647 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1648 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1649 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1652 #ifdef CONFIG_MAC80211_MESH
1653 case NL80211_IFTYPE_MESH_POINT
:
1654 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1655 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1656 /* Do not send frames with mesh_ttl == 0 */
1657 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1661 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1663 if (compare_ether_addr(dev
->dev_addr
,
1664 skb
->data
+ ETH_ALEN
) == 0) {
1666 memset(hdr
.addr1
, 0, ETH_ALEN
);
1667 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1668 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1669 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1670 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1672 /* packet from other interface */
1673 struct mesh_path
*mppath
;
1675 memset(hdr
.addr1
, 0, ETH_ALEN
);
1676 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1677 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1679 if (is_multicast_ether_addr(skb
->data
))
1680 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1683 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1685 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1687 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1691 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1692 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1693 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1694 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1695 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1696 sdata
->u
.mesh
.mesh_seqnum
++;
1702 case NL80211_IFTYPE_STATION
:
1703 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1705 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1706 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1707 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1710 case NL80211_IFTYPE_ADHOC
:
1712 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1713 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1714 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1723 * There's no need to try to look up the destination
1724 * if it is a multicast address (which can only happen
1727 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1729 sta
= sta_info_get(local
, hdr
.addr1
);
1731 sta_flags
= get_sta_flags(sta
);
1735 /* receiver and we are QoS enabled, use a QoS type frame */
1736 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1737 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1742 * Drop unicast frames to unauthorised stations unless they are
1743 * EAPOL frames from the local station.
1745 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1746 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1747 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1748 !(ethertype
== ETH_P_PAE
&&
1749 compare_ether_addr(dev
->dev_addr
,
1750 skb
->data
+ ETH_ALEN
) == 0))) {
1751 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1752 if (net_ratelimit())
1753 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1754 " (unauthorized port)\n", dev
->name
,
1758 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1764 hdr
.frame_control
= fc
;
1765 hdr
.duration_id
= 0;
1768 skip_header_bytes
= ETH_HLEN
;
1769 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1770 encaps_data
= bridge_tunnel_header
;
1771 encaps_len
= sizeof(bridge_tunnel_header
);
1772 skip_header_bytes
-= 2;
1773 } else if (ethertype
>= 0x600) {
1774 encaps_data
= rfc1042_header
;
1775 encaps_len
= sizeof(rfc1042_header
);
1776 skip_header_bytes
-= 2;
1782 skb_pull(skb
, skip_header_bytes
);
1783 nh_pos
-= skip_header_bytes
;
1784 h_pos
-= skip_header_bytes
;
1786 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1789 * So we need to modify the skb header and hence need a copy of
1790 * that. The head_need variable above doesn't, so far, include
1791 * the needed header space that we don't need right away. If we
1792 * can, then we don't reallocate right now but only after the
1793 * frame arrives at the master device (if it does...)
1795 * If we cannot, however, then we will reallocate to include all
1796 * the ever needed space. Also, if we need to reallocate it anyway,
1797 * make it big enough for everything we may ever need.
1800 if (head_need
> 0 || skb_cloned(skb
)) {
1801 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1802 head_need
+= local
->tx_headroom
;
1803 head_need
= max_t(int, 0, head_need
);
1804 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1809 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1810 nh_pos
+= encaps_len
;
1811 h_pos
+= encaps_len
;
1814 if (meshhdrlen
> 0) {
1815 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1816 nh_pos
+= meshhdrlen
;
1817 h_pos
+= meshhdrlen
;
1820 if (ieee80211_is_data_qos(fc
)) {
1821 __le16
*qos_control
;
1823 qos_control
= (__le16
*) skb_push(skb
, 2);
1824 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1826 * Maybe we could actually set some fields here, for now just
1827 * initialise to zero to indicate no special operation.
1831 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1836 skb
->iif
= dev
->ifindex
;
1838 skb
->dev
= local
->mdev
;
1839 dev
->stats
.tx_packets
++;
1840 dev
->stats
.tx_bytes
+= skb
->len
;
1842 /* Update skb pointers to various headers since this modified frame
1843 * is going to go through Linux networking code that may potentially
1844 * need things like pointer to IP header. */
1845 skb_set_mac_header(skb
, 0);
1846 skb_set_network_header(skb
, nh_pos
);
1847 skb_set_transport_header(skb
, h_pos
);
1849 dev
->trans_start
= jiffies
;
1850 dev_queue_xmit(skb
);
1863 * ieee80211_clear_tx_pending may not be called in a context where
1864 * it is possible that it packets could come in again.
1866 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1870 for (i
= 0; i
< local
->hw
.queues
; i
++)
1871 skb_queue_purge(&local
->pending
[i
]);
1874 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1875 struct sk_buff
*skb
)
1877 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1878 struct ieee80211_sub_if_data
*sdata
;
1879 struct sta_info
*sta
;
1880 struct ieee80211_hdr
*hdr
;
1881 struct net_device
*dev
;
1885 /* does interface still exist? */
1886 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1892 /* validate info->control.vif against skb->iif */
1893 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1894 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1895 sdata
= container_of(sdata
->bss
,
1896 struct ieee80211_sub_if_data
,
1899 if (unlikely(info
->control
.vif
&& info
->control
.vif
!= &sdata
->vif
)) {
1905 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1906 ieee80211_tx(dev
, skb
, true);
1908 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1909 sta
= sta_info_get(local
, hdr
->addr1
);
1911 ret
= __ieee80211_tx(local
, &skb
, sta
);
1912 if (ret
!= IEEE80211_TX_OK
)
1923 * Transmit all pending packets. Called from tasklet, locks master device
1924 * TX lock so that no new packets can come in.
1926 void ieee80211_tx_pending(unsigned long data
)
1928 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1929 struct net_device
*dev
= local
->mdev
;
1930 unsigned long flags
;
1935 netif_tx_lock_bh(dev
);
1937 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1939 * If queue is stopped by something other than due to pending
1940 * frames, or we have no pending frames, proceed to next queue.
1942 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1944 if (local
->queue_stop_reasons
[i
] !=
1945 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING
) ||
1946 skb_queue_empty(&local
->pending
[i
]))
1948 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1954 * start the queue now to allow processing our packets,
1955 * we're under the tx lock here anyway so nothing will
1956 * happen as a result of this
1958 netif_start_subqueue(local
->mdev
, i
);
1960 while (!skb_queue_empty(&local
->pending
[i
])) {
1961 struct sk_buff
*skb
= skb_dequeue(&local
->pending
[i
]);
1963 if (!ieee80211_tx_pending_skb(local
, skb
)) {
1964 skb_queue_head(&local
->pending
[i
], skb
);
1969 /* Start regular packet processing again. */
1970 if (skb_queue_empty(&local
->pending
[i
]))
1971 ieee80211_wake_queue_by_reason(&local
->hw
, i
,
1972 IEEE80211_QUEUE_STOP_REASON_PENDING
);
1975 netif_tx_unlock_bh(dev
);
1979 /* functions for drivers to get certain frames */
1981 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1982 struct sk_buff
*skb
,
1983 struct beacon_data
*beacon
)
1987 int i
, have_bits
= 0, n1
, n2
;
1989 /* Generate bitmap for TIM only if there are any STAs in power save
1991 if (atomic_read(&bss
->num_sta_ps
) > 0)
1992 /* in the hope that this is faster than
1993 * checking byte-for-byte */
1994 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1995 IEEE80211_MAX_AID
+1);
1997 if (bss
->dtim_count
== 0)
1998 bss
->dtim_count
= beacon
->dtim_period
- 1;
2002 tim
= pos
= (u8
*) skb_put(skb
, 6);
2003 *pos
++ = WLAN_EID_TIM
;
2005 *pos
++ = bss
->dtim_count
;
2006 *pos
++ = beacon
->dtim_period
;
2008 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2012 /* Find largest even number N1 so that bits numbered 1 through
2013 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2014 * (N2 + 1) x 8 through 2007 are 0. */
2016 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2023 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2030 /* Bitmap control */
2032 /* Part Virt Bitmap */
2033 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2035 tim
[1] = n2
- n1
+ 4;
2036 skb_put(skb
, n2
- n1
);
2038 *pos
++ = aid0
; /* Bitmap control */
2039 *pos
++ = 0; /* Part Virt Bitmap */
2043 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
2044 struct ieee80211_vif
*vif
)
2046 struct ieee80211_local
*local
= hw_to_local(hw
);
2047 struct sk_buff
*skb
= NULL
;
2048 struct ieee80211_tx_info
*info
;
2049 struct ieee80211_sub_if_data
*sdata
= NULL
;
2050 struct ieee80211_if_ap
*ap
= NULL
;
2051 struct beacon_data
*beacon
;
2052 struct ieee80211_supported_band
*sband
;
2053 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2055 sband
= local
->hw
.wiphy
->bands
[band
];
2059 sdata
= vif_to_sdata(vif
);
2061 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2063 beacon
= rcu_dereference(ap
->beacon
);
2066 * headroom, head length,
2067 * tail length and maximum TIM length
2069 skb
= dev_alloc_skb(local
->tx_headroom
+
2071 beacon
->tail_len
+ 256);
2075 skb_reserve(skb
, local
->tx_headroom
);
2076 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2080 * Not very nice, but we want to allow the driver to call
2081 * ieee80211_beacon_get() as a response to the set_tim()
2082 * callback. That, however, is already invoked under the
2083 * sta_lock to guarantee consistent and race-free update
2084 * of the tim bitmap in mac80211 and the driver.
2086 if (local
->tim_in_locked_section
) {
2087 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2089 unsigned long flags
;
2091 spin_lock_irqsave(&local
->sta_lock
, flags
);
2092 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2093 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2097 memcpy(skb_put(skb
, beacon
->tail_len
),
2098 beacon
->tail
, beacon
->tail_len
);
2101 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2102 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2103 struct ieee80211_hdr
*hdr
;
2104 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2109 skb
= skb_copy(presp
, GFP_ATOMIC
);
2113 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2114 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2115 IEEE80211_STYPE_BEACON
);
2116 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2117 struct ieee80211_mgmt
*mgmt
;
2120 /* headroom, head length, tail length and maximum TIM length */
2121 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2125 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2126 mgmt
= (struct ieee80211_mgmt
*)
2127 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2128 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2129 mgmt
->frame_control
=
2130 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2131 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2132 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
2133 /* BSSID is left zeroed, wildcard value */
2134 mgmt
->u
.beacon
.beacon_int
=
2135 cpu_to_le16(local
->hw
.conf
.beacon_int
);
2136 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2138 pos
= skb_put(skb
, 2);
2139 *pos
++ = WLAN_EID_SSID
;
2142 mesh_mgmt_ies_add(skb
, sdata
);
2148 info
= IEEE80211_SKB_CB(skb
);
2150 skb
->do_not_encrypt
= 1;
2154 * XXX: For now, always use the lowest rate
2156 info
->control
.rates
[0].idx
= 0;
2157 info
->control
.rates
[0].count
= 1;
2158 info
->control
.rates
[1].idx
= -1;
2159 info
->control
.rates
[2].idx
= -1;
2160 info
->control
.rates
[3].idx
= -1;
2161 info
->control
.rates
[4].idx
= -1;
2162 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
2164 info
->control
.vif
= vif
;
2166 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2167 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2168 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2173 EXPORT_SYMBOL(ieee80211_beacon_get
);
2175 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2176 const void *frame
, size_t frame_len
,
2177 const struct ieee80211_tx_info
*frame_txctl
,
2178 struct ieee80211_rts
*rts
)
2180 const struct ieee80211_hdr
*hdr
= frame
;
2182 rts
->frame_control
=
2183 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2184 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2186 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2187 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2189 EXPORT_SYMBOL(ieee80211_rts_get
);
2191 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2192 const void *frame
, size_t frame_len
,
2193 const struct ieee80211_tx_info
*frame_txctl
,
2194 struct ieee80211_cts
*cts
)
2196 const struct ieee80211_hdr
*hdr
= frame
;
2198 cts
->frame_control
=
2199 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2200 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2201 frame_len
, frame_txctl
);
2202 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2204 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2207 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2208 struct ieee80211_vif
*vif
)
2210 struct ieee80211_local
*local
= hw_to_local(hw
);
2211 struct sk_buff
*skb
= NULL
;
2212 struct sta_info
*sta
;
2213 struct ieee80211_tx_data tx
;
2214 struct ieee80211_sub_if_data
*sdata
;
2215 struct ieee80211_if_ap
*bss
= NULL
;
2216 struct beacon_data
*beacon
;
2217 struct ieee80211_tx_info
*info
;
2219 sdata
= vif_to_sdata(vif
);
2226 beacon
= rcu_dereference(bss
->beacon
);
2228 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2231 if (bss
->dtim_count
!= 0)
2232 goto out
; /* send buffered bc/mc only after DTIM beacon */
2235 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2238 local
->total_ps_buffered
--;
2240 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2241 struct ieee80211_hdr
*hdr
=
2242 (struct ieee80211_hdr
*) skb
->data
;
2243 /* more buffered multicast/broadcast frames ==> set
2244 * MoreData flag in IEEE 802.11 header to inform PS
2246 hdr
->frame_control
|=
2247 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2250 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2252 dev_kfree_skb_any(skb
);
2255 info
= IEEE80211_SKB_CB(skb
);
2258 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2259 tx
.channel
= local
->hw
.conf
.channel
;
2260 info
->band
= tx
.channel
->band
;
2262 if (invoke_tx_handlers(&tx
))
2269 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);