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
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
186 struct ieee80211_local
*local
= tx
->local
;
187 struct ieee80211_if_managed
*ifmgd
;
189 /* driver doesn't support power save */
190 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
193 /* hardware does dynamic power save */
194 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
197 /* dynamic power save disabled */
198 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
201 /* we are scanning, don't enable power save */
205 if (!local
->ps_sdata
)
208 /* No point if we're going to suspend */
209 if (local
->quiescing
)
212 /* dynamic ps is supported only in managed mode */
213 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
216 ifmgd
= &tx
->sdata
->u
.mgd
;
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
231 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
232 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
233 && skb_get_queue_mapping(tx
->skb
) == 0)
236 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
237 ieee80211_stop_queues_by_reason(&local
->hw
,
238 IEEE80211_QUEUE_STOP_REASON_PS
);
239 ieee80211_queue_work(&local
->hw
,
240 &local
->dynamic_ps_disable_work
);
243 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
244 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
253 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
254 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
257 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
260 if (unlikely(test_bit(SCAN_OFF_CHANNEL
, &tx
->local
->scanning
)) &&
261 !ieee80211_is_probe_req(hdr
->frame_control
) &&
262 !ieee80211_is_nullfunc(hdr
->frame_control
))
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
276 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
279 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
282 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
284 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
285 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
286 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
287 ieee80211_is_data(hdr
->frame_control
))) {
288 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
289 printk(KERN_DEBUG
"%s: dropped data frame to not "
290 "associated station %pM\n",
291 tx
->sdata
->name
, hdr
->addr1
);
292 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
293 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
297 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
298 tx
->local
->num_sta
== 0 &&
299 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
301 * No associated STAs - no need to send multicast
312 /* This function is called whenever the AP is about to exceed the maximum limit
313 * of buffered frames for power saving STAs. This situation should not really
314 * happen often during normal operation, so dropping the oldest buffered packet
315 * from each queue should be OK to make some room for new frames. */
316 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
318 int total
= 0, purged
= 0;
320 struct ieee80211_sub_if_data
*sdata
;
321 struct sta_info
*sta
;
324 * virtual interfaces are protected by RCU
328 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
329 struct ieee80211_if_ap
*ap
;
330 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
333 skb
= skb_dequeue(&ap
->ps_bc_buf
);
338 total
+= skb_queue_len(&ap
->ps_bc_buf
);
341 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
342 skb
= skb_dequeue(&sta
->ps_tx_buf
);
347 total
+= skb_queue_len(&sta
->ps_tx_buf
);
352 local
->total_ps_buffered
= total
;
353 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
354 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
355 wiphy_name(local
->hw
.wiphy
), purged
);
359 static ieee80211_tx_result
360 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
362 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
363 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
366 * broadcast/multicast frame
368 * If any of the associated stations is in power save mode,
369 * the frame is buffered to be sent after DTIM beacon frame.
370 * This is done either by the hardware or us.
373 /* powersaving STAs only in AP/VLAN mode */
377 /* no buffering for ordered frames */
378 if (ieee80211_has_order(hdr
->frame_control
))
381 /* no stations in PS mode */
382 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
385 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
387 /* device releases frame after DTIM beacon */
388 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
391 /* buffered in mac80211 */
392 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
393 purge_old_ps_buffers(tx
->local
);
395 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
398 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
401 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
403 tx
->local
->total_ps_buffered
++;
405 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
410 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
413 if (!ieee80211_is_mgmt(fc
))
416 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
419 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
426 static ieee80211_tx_result
427 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
429 struct sta_info
*sta
= tx
->sta
;
430 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
431 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
435 ieee80211_is_probe_resp(hdr
->frame_control
) ||
436 ieee80211_is_auth(hdr
->frame_control
) ||
437 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
438 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
441 staflags
= get_sta_flags(sta
);
443 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
444 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
445 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
446 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
448 sta
->sta
.addr
, sta
->sta
.aid
,
449 skb_queue_len(&sta
->ps_tx_buf
));
450 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
451 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
452 purge_old_ps_buffers(tx
->local
);
453 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
454 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
455 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
456 if (net_ratelimit()) {
457 printk(KERN_DEBUG
"%s: STA %pM TX "
458 "buffer full - dropping oldest frame\n",
459 tx
->sdata
->name
, sta
->sta
.addr
);
464 tx
->local
->total_ps_buffered
++;
467 * Queue frame to be sent after STA wakes up/polls,
468 * but don't set the TIM bit if the driver is blocking
469 * wakeup or poll response transmissions anyway.
471 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
472 !(staflags
& WLAN_STA_PS_DRIVER
))
473 sta_info_set_tim_bit(sta
);
475 info
->control
.jiffies
= jiffies
;
476 info
->control
.vif
= &tx
->sdata
->vif
;
477 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
478 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
481 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
482 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
483 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
484 "set -> send frame\n", tx
->sdata
->name
,
487 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
492 static ieee80211_tx_result debug_noinline
493 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
495 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
498 if (tx
->flags
& IEEE80211_TX_UNICAST
)
499 return ieee80211_tx_h_unicast_ps_buf(tx
);
501 return ieee80211_tx_h_multicast_ps_buf(tx
);
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
507 struct ieee80211_key
*key
= NULL
;
508 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
509 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
511 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
513 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
515 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
516 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
518 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
520 else if (tx
->sdata
->drop_unencrypted
&&
521 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
522 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
523 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
524 (ieee80211_is_action(hdr
->frame_control
) &&
525 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
526 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
532 tx
->key
->tx_rx_count
++;
533 /* TODO: add threshold stuff again */
535 switch (tx
->key
->conf
.alg
) {
537 if (ieee80211_is_auth(hdr
->frame_control
))
540 if (!ieee80211_is_data_present(hdr
->frame_control
))
544 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
545 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
550 if (!ieee80211_is_mgmt(hdr
->frame_control
))
556 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
557 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
562 static ieee80211_tx_result debug_noinline
563 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
565 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
566 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
567 struct ieee80211_supported_band
*sband
;
568 struct ieee80211_rate
*rate
;
570 bool inval
= false, rts
= false, short_preamble
= false;
571 struct ieee80211_tx_rate_control txrc
;
574 memset(&txrc
, 0, sizeof(txrc
));
576 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
578 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
579 tx
->local
->hw
.wiphy
->frag_threshold
);
581 /* set up the tx rate control struct we give the RC algo */
582 txrc
.hw
= local_to_hw(tx
->local
);
584 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
586 txrc
.reported_rate
.idx
= -1;
587 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
588 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
589 txrc
.max_rate_idx
= -1;
591 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
592 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
594 /* set up RTS protection if desired */
595 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
596 txrc
.rts
= rts
= true;
600 * Use short preamble if the BSS can handle it, but not for
601 * management frames unless we know the receiver can handle
602 * that -- the management frame might be to a station that
603 * just wants a probe response.
605 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
606 (ieee80211_is_data(hdr
->frame_control
) ||
607 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
608 txrc
.short_preamble
= short_preamble
= true;
610 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
613 * Lets not bother rate control if we're associated and cannot
614 * talk to the sta. This should not happen.
616 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
617 (sta_flags
& WLAN_STA_ASSOC
) &&
618 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
619 "%s: Dropped data frame as no usable bitrate found while "
620 "scanning and associated. Target station: "
621 "%pM on %d GHz band\n",
622 tx
->sdata
->name
, hdr
->addr1
,
623 tx
->channel
->band
? 5 : 2))
627 * If we're associated with the sta at this point we know we can at
628 * least send the frame at the lowest bit rate.
630 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
632 if (unlikely(info
->control
.rates
[0].idx
< 0))
635 if (txrc
.reported_rate
.idx
< 0)
636 txrc
.reported_rate
= info
->control
.rates
[0];
639 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
641 if (unlikely(!info
->control
.rates
[0].count
))
642 info
->control
.rates
[0].count
= 1;
644 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
645 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
646 info
->control
.rates
[0].count
= 1;
648 if (is_multicast_ether_addr(hdr
->addr1
)) {
650 * XXX: verify the rate is in the basic rateset
656 * set up the RTS/CTS rate as the fastest basic rate
657 * that is not faster than the data rate
659 * XXX: Should this check all retry rates?
661 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
664 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
666 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
667 /* must be a basic rate */
668 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
670 /* must not be faster than the data rate */
671 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
674 if (sband
->bitrates
[baserate
].bitrate
<
675 sband
->bitrates
[i
].bitrate
)
679 info
->control
.rts_cts_rate_idx
= baserate
;
682 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
684 * make sure there's no valid rate following
685 * an invalid one, just in case drivers don't
686 * take the API seriously to stop at -1.
689 info
->control
.rates
[i
].idx
= -1;
692 if (info
->control
.rates
[i
].idx
< 0) {
698 * For now assume MCS is already set up correctly, this
701 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
702 WARN_ON(info
->control
.rates
[i
].idx
> 76);
706 /* set up RTS protection if desired */
708 info
->control
.rates
[i
].flags
|=
709 IEEE80211_TX_RC_USE_RTS_CTS
;
712 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
713 sband
->n_bitrates
)) {
714 info
->control
.rates
[i
].idx
= -1;
718 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
720 /* set up short preamble */
721 if (short_preamble
&&
722 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
723 info
->control
.rates
[i
].flags
|=
724 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
726 /* set up G protection */
727 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
728 rate
->flags
& IEEE80211_RATE_ERP_G
)
729 info
->control
.rates
[i
].flags
|=
730 IEEE80211_TX_RC_USE_CTS_PROTECT
;
736 static ieee80211_tx_result debug_noinline
737 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
739 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
742 info
->control
.sta
= &tx
->sta
->sta
;
747 static ieee80211_tx_result debug_noinline
748 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
750 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
751 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
757 * Packet injection may want to control the sequence
758 * number, if we have no matching interface then we
759 * neither assign one ourselves nor ask the driver to.
761 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
764 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
767 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
771 * Anything but QoS data that has a sequence number field
772 * (is long enough) gets a sequence number from the global
775 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
776 /* driver should assign sequence number */
777 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
778 /* for pure STA mode without beacons, we can do it */
779 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
780 tx
->sdata
->sequence_number
+= 0x10;
785 * This should be true for injected/management frames only, for
786 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
787 * above since they are not QoS-data frames.
792 /* include per-STA, per-TID sequence counter */
794 qc
= ieee80211_get_qos_ctl(hdr
);
795 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
796 seq
= &tx
->sta
->tid_seq
[tid
];
798 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
800 /* Increase the sequence number. */
801 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
806 static int ieee80211_fragment(struct ieee80211_local
*local
,
807 struct sk_buff
*skb
, int hdrlen
,
810 struct sk_buff
*tail
= skb
, *tmp
;
811 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
812 int pos
= hdrlen
+ per_fragm
;
813 int rem
= skb
->len
- hdrlen
- per_fragm
;
815 if (WARN_ON(rem
< 0))
819 int fraglen
= per_fragm
;
824 tmp
= dev_alloc_skb(local
->tx_headroom
+
826 IEEE80211_ENCRYPT_HEADROOM
+
827 IEEE80211_ENCRYPT_TAILROOM
);
832 skb_reserve(tmp
, local
->tx_headroom
+
833 IEEE80211_ENCRYPT_HEADROOM
);
834 /* copy control information */
835 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
836 skb_copy_queue_mapping(tmp
, skb
);
837 tmp
->priority
= skb
->priority
;
840 /* copy header and data */
841 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
842 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
847 skb
->len
= hdrlen
+ per_fragm
;
851 static ieee80211_tx_result debug_noinline
852 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
854 struct sk_buff
*skb
= tx
->skb
;
855 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
856 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
857 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
861 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
865 * Warn when submitting a fragmented A-MPDU frame and drop it.
866 * This scenario is handled in ieee80211_tx_prepare but extra
867 * caution taken here as fragmented ampdu may cause Tx stop.
869 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
872 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
874 /* internal error, why is TX_FRAGMENTED set? */
875 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
879 * Now fragment the frame. This will allocate all the fragments and
880 * chain them (using skb as the first fragment) to skb->next.
881 * During transmission, we will remove the successfully transmitted
882 * fragments from this list. When the low-level driver rejects one
883 * of the fragments then we will simply pretend to accept the skb
884 * but store it away as pending.
886 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
889 /* update duration/seq/flags of fragments */
893 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
895 hdr
= (void *)skb
->data
;
896 info
= IEEE80211_SKB_CB(skb
);
899 hdr
->frame_control
|= morefrags
;
900 next_len
= skb
->next
->len
;
902 * No multi-rate retries for fragmented frames, that
903 * would completely throw off the NAV at other STAs.
905 info
->control
.rates
[1].idx
= -1;
906 info
->control
.rates
[2].idx
= -1;
907 info
->control
.rates
[3].idx
= -1;
908 info
->control
.rates
[4].idx
= -1;
909 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
910 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
912 hdr
->frame_control
&= ~morefrags
;
915 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
916 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
918 } while ((skb
= skb
->next
));
923 static ieee80211_tx_result debug_noinline
924 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
926 struct sk_buff
*skb
= tx
->skb
;
931 tx
->sta
->tx_packets
++;
933 tx
->sta
->tx_fragments
++;
934 tx
->sta
->tx_bytes
+= skb
->len
;
935 } while ((skb
= skb
->next
));
940 static ieee80211_tx_result debug_noinline
941 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
946 switch (tx
->key
->conf
.alg
) {
948 return ieee80211_crypto_wep_encrypt(tx
);
950 return ieee80211_crypto_tkip_encrypt(tx
);
952 return ieee80211_crypto_ccmp_encrypt(tx
);
954 return ieee80211_crypto_aes_cmac_encrypt(tx
);
962 static ieee80211_tx_result debug_noinline
963 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
965 struct sk_buff
*skb
= tx
->skb
;
966 struct ieee80211_hdr
*hdr
;
971 hdr
= (void *) skb
->data
;
972 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
973 break; /* must not overwrite AID */
974 next_len
= skb
->next
? skb
->next
->len
: 0;
975 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
978 ieee80211_duration(tx
, group_addr
, next_len
);
979 } while ((skb
= skb
->next
));
984 /* actual transmit path */
987 * deal with packet injection down monitor interface
988 * with Radiotap Header -- only called for monitor mode interface
990 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
994 * this is the moment to interpret and discard the radiotap header that
995 * must be at the start of the packet injected in Monitor mode
997 * Need to take some care with endian-ness since radiotap
998 * args are little-endian
1001 struct ieee80211_radiotap_iterator iterator
;
1002 struct ieee80211_radiotap_header
*rthdr
=
1003 (struct ieee80211_radiotap_header
*) skb
->data
;
1004 struct ieee80211_supported_band
*sband
;
1005 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1006 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
1008 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
1010 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1011 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1014 * for every radiotap entry that is present
1015 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1016 * entries present, or -EINVAL on error)
1020 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1025 /* see if this argument is something we can use */
1026 switch (iterator
.this_arg_index
) {
1028 * You must take care when dereferencing iterator.this_arg
1029 * for multibyte types... the pointer is not aligned. Use
1030 * get_unaligned((type *)iterator.this_arg) to dereference
1031 * iterator.this_arg for type "type" safely on all arches.
1033 case IEEE80211_RADIOTAP_FLAGS
:
1034 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1036 * this indicates that the skb we have been
1037 * handed has the 32-bit FCS CRC at the end...
1038 * we should react to that by snipping it off
1039 * because it will be recomputed and added
1042 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
1045 skb_trim(skb
, skb
->len
- FCS_LEN
);
1047 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1048 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1049 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1050 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1054 * Please update the file
1055 * Documentation/networking/mac80211-injection.txt
1056 * when parsing new fields here.
1064 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1068 * remove the radiotap header
1069 * iterator->max_length was sanity-checked against
1070 * skb->len by iterator init
1072 skb_pull(skb
, iterator
.max_length
);
1080 static ieee80211_tx_result
1081 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1082 struct ieee80211_tx_data
*tx
,
1083 struct sk_buff
*skb
)
1085 struct ieee80211_local
*local
= sdata
->local
;
1086 struct ieee80211_hdr
*hdr
;
1087 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1090 bool queued
= false;
1092 memset(tx
, 0, sizeof(*tx
));
1096 tx
->channel
= local
->hw
.conf
.channel
;
1098 * Set this flag (used below to indicate "automatic fragmentation"),
1099 * it will be cleared/left by radiotap as desired.
1101 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1103 /* process and remove the injection radiotap header */
1104 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
1105 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1109 * __ieee80211_parse_tx_radiotap has now removed
1110 * the radiotap header that was present and pre-filled
1111 * 'tx' with tx control information.
1116 * If this flag is set to true anywhere, and we get here,
1117 * we are doing the needed processing, so remove the flag
1120 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1122 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1124 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1125 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1126 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1130 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1132 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1133 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1134 unsigned long flags
;
1135 struct tid_ampdu_tx
*tid_tx
;
1137 qc
= ieee80211_get_qos_ctl(hdr
);
1138 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1140 spin_lock_irqsave(&tx
->sta
->lock
, flags
);
1142 * XXX: This spinlock could be fairly expensive, but see the
1143 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1144 * One way to solve this would be to do something RCU-like
1145 * for managing the tid_tx struct and using atomic bitops
1146 * for the actual state -- by introducing an actual
1147 * 'operational' bit that would be possible. It would
1148 * require changing ieee80211_agg_tx_operational() to
1149 * set that bit, and changing the way tid_tx is managed
1150 * everywhere, including races between that bit and
1151 * tid_tx going away (tid_tx being added can be easily
1152 * committed to memory before the 'operational' bit).
1154 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1155 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1156 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1157 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1158 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1161 info
->control
.vif
= &sdata
->vif
;
1162 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1163 __skb_queue_tail(&tid_tx
->pending
, skb
);
1165 spin_unlock_irqrestore(&tx
->sta
->lock
, flags
);
1167 if (unlikely(queued
))
1171 if (is_multicast_ether_addr(hdr
->addr1
)) {
1172 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1173 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1175 tx
->flags
|= IEEE80211_TX_UNICAST
;
1176 if (unlikely(local
->wifi_wme_noack_test
))
1177 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1179 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1182 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1183 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1184 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1185 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1186 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1188 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1192 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1193 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1194 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1196 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1197 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1198 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1199 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1201 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1206 static int __ieee80211_tx(struct ieee80211_local
*local
,
1207 struct sk_buff
**skbp
,
1208 struct sta_info
*sta
,
1211 struct sk_buff
*skb
= *skbp
, *next
;
1212 struct ieee80211_tx_info
*info
;
1213 struct ieee80211_sub_if_data
*sdata
;
1214 unsigned long flags
;
1219 int q
= skb_get_queue_mapping(skb
);
1221 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1222 ret
= IEEE80211_TX_OK
;
1223 if (local
->queue_stop_reasons
[q
] ||
1224 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1225 ret
= IEEE80211_TX_PENDING
;
1226 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1227 if (ret
!= IEEE80211_TX_OK
)
1230 info
= IEEE80211_SKB_CB(skb
);
1233 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1234 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1240 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1242 sdata
= vif_to_sdata(info
->control
.vif
);
1244 switch (sdata
->vif
.type
) {
1245 case NL80211_IFTYPE_MONITOR
:
1246 info
->control
.vif
= NULL
;
1248 case NL80211_IFTYPE_AP_VLAN
:
1249 info
->control
.vif
= &container_of(sdata
->bss
,
1250 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1257 ret
= drv_tx(local
, skb
);
1258 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1262 if (ret
!= NETDEV_TX_OK
) {
1263 info
->control
.vif
= &sdata
->vif
;
1264 return IEEE80211_TX_AGAIN
;
1268 ieee80211_led_tx(local
, 1);
1272 return IEEE80211_TX_OK
;
1276 * Invoke TX handlers, return 0 on success and non-zero if the
1277 * frame was dropped or queued.
1279 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1281 struct sk_buff
*skb
= tx
->skb
;
1282 ieee80211_tx_result res
= TX_DROP
;
1284 #define CALL_TXH(txh) \
1287 if (res != TX_CONTINUE) \
1291 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1292 CALL_TXH(ieee80211_tx_h_check_assoc
);
1293 CALL_TXH(ieee80211_tx_h_ps_buf
);
1294 CALL_TXH(ieee80211_tx_h_select_key
);
1295 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1296 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1297 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1298 CALL_TXH(ieee80211_tx_h_misc
);
1299 CALL_TXH(ieee80211_tx_h_sequence
);
1300 CALL_TXH(ieee80211_tx_h_fragment
);
1301 /* handlers after fragment must be aware of tx info fragmentation! */
1302 CALL_TXH(ieee80211_tx_h_stats
);
1303 CALL_TXH(ieee80211_tx_h_encrypt
);
1304 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1308 if (unlikely(res
== TX_DROP
)) {
1309 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1311 struct sk_buff
*next
;
1318 } else if (unlikely(res
== TX_QUEUED
)) {
1319 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1326 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1327 struct sk_buff
*skb
, bool txpending
)
1329 struct ieee80211_local
*local
= sdata
->local
;
1330 struct ieee80211_tx_data tx
;
1331 ieee80211_tx_result res_prepare
;
1332 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1333 struct sk_buff
*next
;
1334 unsigned long flags
;
1338 queue
= skb_get_queue_mapping(skb
);
1340 if (unlikely(skb
->len
< 10)) {
1347 /* initialises tx */
1348 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1350 if (unlikely(res_prepare
== TX_DROP
)) {
1354 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1359 tx
.channel
= local
->hw
.conf
.channel
;
1360 info
->band
= tx
.channel
->band
;
1362 if (invoke_tx_handlers(&tx
))
1367 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1369 case IEEE80211_TX_OK
:
1371 case IEEE80211_TX_AGAIN
:
1373 * Since there are no fragmented frames on A-MPDU
1374 * queues, there's no reason for a driver to reject
1375 * a frame there, warn and drop it.
1377 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1380 case IEEE80211_TX_PENDING
:
1383 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1385 if (local
->queue_stop_reasons
[queue
] ||
1386 !skb_queue_empty(&local
->pending
[queue
])) {
1388 * if queue is stopped, queue up frames for later
1389 * transmission from the tasklet
1394 if (unlikely(txpending
))
1395 __skb_queue_head(&local
->pending
[queue
],
1398 __skb_queue_tail(&local
->pending
[queue
],
1400 } while ((skb
= next
));
1402 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1406 * otherwise retry, but this is a race condition or
1407 * a driver bug (which we warn about if it persists)
1409 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1413 if (WARN(retries
> 10, "tx refused but queue active\n"))
1433 /* device xmit handlers */
1435 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1436 struct sk_buff
*skb
,
1437 int head_need
, bool may_encrypt
)
1442 * This could be optimised, devices that do full hardware
1443 * crypto (including TKIP MMIC) need no tailroom... But we
1444 * have no drivers for such devices currently.
1447 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1448 tail_need
-= skb_tailroom(skb
);
1449 tail_need
= max_t(int, tail_need
, 0);
1452 if (head_need
|| tail_need
) {
1453 /* Sorry. Can't account for this any more */
1457 if (skb_header_cloned(skb
))
1458 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1460 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1462 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1463 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1464 wiphy_name(local
->hw
.wiphy
));
1468 /* update truesize too */
1469 skb
->truesize
+= head_need
+ tail_need
;
1474 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1475 struct sk_buff
*skb
)
1477 struct ieee80211_local
*local
= sdata
->local
;
1478 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1479 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1480 struct ieee80211_sub_if_data
*tmp_sdata
;
1486 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1490 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1492 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1493 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1494 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1496 /* check the header is complete in the frame */
1497 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1499 * We process outgoing injected frames that have a
1500 * local address we handle as though they are our
1502 * This code here isn't entirely correct, the local
1503 * MAC address is not necessarily enough to find
1504 * the interface to use; for that proper VLAN/WDS
1505 * support we will need a different mechanism.
1508 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1510 if (!ieee80211_sdata_running(tmp_sdata
))
1512 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1514 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1523 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1525 headroom
= local
->tx_headroom
;
1527 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1528 headroom
-= skb_headroom(skb
);
1529 headroom
= max_t(int, 0, headroom
);
1531 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1537 info
->control
.vif
= &sdata
->vif
;
1539 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1540 ieee80211_is_data(hdr
->frame_control
) &&
1541 !is_multicast_ether_addr(hdr
->addr1
))
1542 if (mesh_nexthop_lookup(skb
, sdata
)) {
1543 /* skb queued: don't free */
1548 ieee80211_set_qos_hdr(local
, skb
);
1549 ieee80211_tx(sdata
, skb
, false);
1553 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1554 struct net_device
*dev
)
1556 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1557 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1558 struct ieee80211_radiotap_header
*prthdr
=
1559 (struct ieee80211_radiotap_header
*)skb
->data
;
1560 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1564 * Frame injection is not allowed if beaconing is not allowed
1565 * or if we need radar detection. Beaconing is usually not allowed when
1566 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1567 * Passive scan is also used in world regulatory domains where
1568 * your country is not known and as such it should be treated as
1569 * NO TX unless the channel is explicitly allowed in which case
1570 * your current regulatory domain would not have the passive scan
1573 * Since AP mode uses monitor interfaces to inject/TX management
1574 * frames we can make AP mode the exception to this rule once it
1575 * supports radar detection as its implementation can deal with
1576 * radar detection by itself. We can do that later by adding a
1577 * monitor flag interfaces used for AP support.
1579 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1580 IEEE80211_CHAN_PASSIVE_SCAN
)))
1583 /* check for not even having the fixed radiotap header part */
1584 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1585 goto fail
; /* too short to be possibly valid */
1587 /* is it a header version we can trust to find length from? */
1588 if (unlikely(prthdr
->it_version
))
1589 goto fail
; /* only version 0 is supported */
1591 /* then there must be a radiotap header with a length we can use */
1592 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1594 /* does the skb contain enough to deliver on the alleged length? */
1595 if (unlikely(skb
->len
< len_rthdr
))
1596 goto fail
; /* skb too short for claimed rt header extent */
1599 * fix up the pointers accounting for the radiotap
1600 * header still being in there. We are being given
1601 * a precooked IEEE80211 header so no need for
1604 skb_set_mac_header(skb
, len_rthdr
);
1606 * these are just fixed to the end of the rt area since we
1607 * don't have any better information and at this point, nobody cares
1609 skb_set_network_header(skb
, len_rthdr
);
1610 skb_set_transport_header(skb
, len_rthdr
);
1612 memset(info
, 0, sizeof(*info
));
1614 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1616 /* pass the radiotap header up to xmit */
1617 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1618 return NETDEV_TX_OK
;
1622 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1626 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1627 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1628 * @skb: packet to be sent
1629 * @dev: incoming interface
1631 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1632 * not be freed, and caller is responsible for either retrying later or freeing
1635 * This function takes in an Ethernet header and encapsulates it with suitable
1636 * IEEE 802.11 header based on which interface the packet is coming in. The
1637 * encapsulated packet will then be passed to master interface, wlan#.11, for
1638 * transmission (through low-level driver).
1640 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1641 struct net_device
*dev
)
1643 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1644 struct ieee80211_local
*local
= sdata
->local
;
1645 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1646 int ret
= NETDEV_TX_BUSY
, head_need
;
1647 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1649 struct ieee80211_hdr hdr
;
1650 struct ieee80211s_hdr mesh_hdr
;
1651 const u8
*encaps_data
;
1652 int encaps_len
, skip_header_bytes
;
1654 struct sta_info
*sta
= NULL
;
1657 if (unlikely(skb
->len
< ETH_HLEN
)) {
1662 nh_pos
= skb_network_header(skb
) - skb
->data
;
1663 h_pos
= skb_transport_header(skb
) - skb
->data
;
1665 /* convert Ethernet header to proper 802.11 header (based on
1666 * operation mode) */
1667 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1668 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1670 switch (sdata
->vif
.type
) {
1671 case NL80211_IFTYPE_AP_VLAN
:
1673 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1675 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1677 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1678 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1679 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1680 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1682 sta_flags
= get_sta_flags(sta
);
1688 case NL80211_IFTYPE_AP
:
1689 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1691 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1692 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1693 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1696 case NL80211_IFTYPE_WDS
:
1697 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1699 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1700 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1701 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1702 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1705 #ifdef CONFIG_MAC80211_MESH
1706 case NL80211_IFTYPE_MESH_POINT
:
1707 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1708 /* Do not send frames with mesh_ttl == 0 */
1709 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1714 if (compare_ether_addr(sdata
->vif
.addr
,
1715 skb
->data
+ ETH_ALEN
) == 0) {
1716 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1717 skb
->data
, skb
->data
+ ETH_ALEN
);
1718 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1719 sdata
, NULL
, NULL
, NULL
);
1721 /* packet from other interface */
1722 struct mesh_path
*mppath
;
1723 int is_mesh_mcast
= 1;
1727 if (is_multicast_ether_addr(skb
->data
))
1728 /* DA TA mSA AE:SA */
1729 mesh_da
= skb
->data
;
1731 static const u8 bcast
[ETH_ALEN
] =
1732 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1734 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1736 /* RA TA mDA mSA AE:DA SA */
1737 mesh_da
= mppath
->mpp
;
1740 /* DA TA mSA AE:SA */
1744 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1745 mesh_da
, sdata
->vif
.addr
);
1749 ieee80211_new_mesh_header(&mesh_hdr
,
1751 skb
->data
+ ETH_ALEN
,
1756 ieee80211_new_mesh_header(&mesh_hdr
,
1760 skb
->data
+ ETH_ALEN
);
1765 case NL80211_IFTYPE_STATION
:
1766 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1767 if (sdata
->u
.mgd
.use_4addr
&& ethertype
!= ETH_P_PAE
) {
1768 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1770 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1771 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1772 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1775 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1777 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1778 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1782 case NL80211_IFTYPE_ADHOC
:
1784 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1785 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1786 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1795 * There's no need to try to look up the destination
1796 * if it is a multicast address (which can only happen
1799 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1801 sta
= sta_info_get(sdata
, hdr
.addr1
);
1803 sta_flags
= get_sta_flags(sta
);
1807 /* receiver and we are QoS enabled, use a QoS type frame */
1808 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1809 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1814 * Drop unicast frames to unauthorised stations unless they are
1815 * EAPOL frames from the local station.
1817 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1818 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1819 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1820 !(ethertype
== ETH_P_PAE
&&
1821 compare_ether_addr(sdata
->vif
.addr
,
1822 skb
->data
+ ETH_ALEN
) == 0))) {
1823 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1824 if (net_ratelimit())
1825 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1826 " (unauthorized port)\n", dev
->name
,
1830 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1836 hdr
.frame_control
= fc
;
1837 hdr
.duration_id
= 0;
1840 skip_header_bytes
= ETH_HLEN
;
1841 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1842 encaps_data
= bridge_tunnel_header
;
1843 encaps_len
= sizeof(bridge_tunnel_header
);
1844 skip_header_bytes
-= 2;
1845 } else if (ethertype
>= 0x600) {
1846 encaps_data
= rfc1042_header
;
1847 encaps_len
= sizeof(rfc1042_header
);
1848 skip_header_bytes
-= 2;
1854 skb_pull(skb
, skip_header_bytes
);
1855 nh_pos
-= skip_header_bytes
;
1856 h_pos
-= skip_header_bytes
;
1858 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1861 * So we need to modify the skb header and hence need a copy of
1862 * that. The head_need variable above doesn't, so far, include
1863 * the needed header space that we don't need right away. If we
1864 * can, then we don't reallocate right now but only after the
1865 * frame arrives at the master device (if it does...)
1867 * If we cannot, however, then we will reallocate to include all
1868 * the ever needed space. Also, if we need to reallocate it anyway,
1869 * make it big enough for everything we may ever need.
1872 if (head_need
> 0 || skb_cloned(skb
)) {
1873 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1874 head_need
+= local
->tx_headroom
;
1875 head_need
= max_t(int, 0, head_need
);
1876 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1881 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1882 nh_pos
+= encaps_len
;
1883 h_pos
+= encaps_len
;
1886 if (meshhdrlen
> 0) {
1887 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1888 nh_pos
+= meshhdrlen
;
1889 h_pos
+= meshhdrlen
;
1892 if (ieee80211_is_data_qos(fc
)) {
1893 __le16
*qos_control
;
1895 qos_control
= (__le16
*) skb_push(skb
, 2);
1896 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1898 * Maybe we could actually set some fields here, for now just
1899 * initialise to zero to indicate no special operation.
1903 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1908 dev
->stats
.tx_packets
++;
1909 dev
->stats
.tx_bytes
+= skb
->len
;
1911 /* Update skb pointers to various headers since this modified frame
1912 * is going to go through Linux networking code that may potentially
1913 * need things like pointer to IP header. */
1914 skb_set_mac_header(skb
, 0);
1915 skb_set_network_header(skb
, nh_pos
);
1916 skb_set_transport_header(skb
, h_pos
);
1918 memset(info
, 0, sizeof(*info
));
1920 dev
->trans_start
= jiffies
;
1921 ieee80211_xmit(sdata
, skb
);
1923 return NETDEV_TX_OK
;
1926 if (ret
== NETDEV_TX_OK
)
1934 * ieee80211_clear_tx_pending may not be called in a context where
1935 * it is possible that it packets could come in again.
1937 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1941 for (i
= 0; i
< local
->hw
.queues
; i
++)
1942 skb_queue_purge(&local
->pending
[i
]);
1945 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1946 struct sk_buff
*skb
)
1948 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1949 struct ieee80211_sub_if_data
*sdata
;
1950 struct sta_info
*sta
;
1951 struct ieee80211_hdr
*hdr
;
1955 sdata
= vif_to_sdata(info
->control
.vif
);
1957 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1958 ieee80211_tx(sdata
, skb
, true);
1960 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1961 sta
= sta_info_get(sdata
, hdr
->addr1
);
1963 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
1964 if (ret
!= IEEE80211_TX_OK
)
1972 * Transmit all pending packets. Called from tasklet.
1974 void ieee80211_tx_pending(unsigned long data
)
1976 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1977 unsigned long flags
;
1983 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1984 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1986 * If queue is stopped by something other than due to pending
1987 * frames, or we have no pending frames, proceed to next queue.
1989 if (local
->queue_stop_reasons
[i
] ||
1990 skb_queue_empty(&local
->pending
[i
]))
1993 while (!skb_queue_empty(&local
->pending
[i
])) {
1994 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
1995 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1996 struct ieee80211_sub_if_data
*sdata
;
1998 if (WARN_ON(!info
->control
.vif
)) {
2003 sdata
= vif_to_sdata(info
->control
.vif
);
2004 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2007 txok
= ieee80211_tx_pending_skb(local
, skb
);
2009 __skb_queue_head(&local
->pending
[i
], skb
);
2010 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2016 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2021 /* functions for drivers to get certain frames */
2023 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2024 struct sk_buff
*skb
,
2025 struct beacon_data
*beacon
)
2029 int i
, have_bits
= 0, n1
, n2
;
2031 /* Generate bitmap for TIM only if there are any STAs in power save
2033 if (atomic_read(&bss
->num_sta_ps
) > 0)
2034 /* in the hope that this is faster than
2035 * checking byte-for-byte */
2036 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2037 IEEE80211_MAX_AID
+1);
2039 if (bss
->dtim_count
== 0)
2040 bss
->dtim_count
= beacon
->dtim_period
- 1;
2044 tim
= pos
= (u8
*) skb_put(skb
, 6);
2045 *pos
++ = WLAN_EID_TIM
;
2047 *pos
++ = bss
->dtim_count
;
2048 *pos
++ = beacon
->dtim_period
;
2050 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2054 /* Find largest even number N1 so that bits numbered 1 through
2055 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2056 * (N2 + 1) x 8 through 2007 are 0. */
2058 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2065 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2072 /* Bitmap control */
2074 /* Part Virt Bitmap */
2075 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2077 tim
[1] = n2
- n1
+ 4;
2078 skb_put(skb
, n2
- n1
);
2080 *pos
++ = aid0
; /* Bitmap control */
2081 *pos
++ = 0; /* Part Virt Bitmap */
2085 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2086 struct ieee80211_vif
*vif
,
2087 u16
*tim_offset
, u16
*tim_length
)
2089 struct ieee80211_local
*local
= hw_to_local(hw
);
2090 struct sk_buff
*skb
= NULL
;
2091 struct ieee80211_tx_info
*info
;
2092 struct ieee80211_sub_if_data
*sdata
= NULL
;
2093 struct ieee80211_if_ap
*ap
= NULL
;
2094 struct beacon_data
*beacon
;
2095 struct ieee80211_supported_band
*sband
;
2096 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2097 struct ieee80211_tx_rate_control txrc
;
2099 sband
= local
->hw
.wiphy
->bands
[band
];
2103 sdata
= vif_to_sdata(vif
);
2110 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2112 beacon
= rcu_dereference(ap
->beacon
);
2115 * headroom, head length,
2116 * tail length and maximum TIM length
2118 skb
= dev_alloc_skb(local
->tx_headroom
+
2120 beacon
->tail_len
+ 256);
2124 skb_reserve(skb
, local
->tx_headroom
);
2125 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2129 * Not very nice, but we want to allow the driver to call
2130 * ieee80211_beacon_get() as a response to the set_tim()
2131 * callback. That, however, is already invoked under the
2132 * sta_lock to guarantee consistent and race-free update
2133 * of the tim bitmap in mac80211 and the driver.
2135 if (local
->tim_in_locked_section
) {
2136 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2138 unsigned long flags
;
2140 spin_lock_irqsave(&local
->sta_lock
, flags
);
2141 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2142 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2146 *tim_offset
= beacon
->head_len
;
2148 *tim_length
= skb
->len
- beacon
->head_len
;
2151 memcpy(skb_put(skb
, beacon
->tail_len
),
2152 beacon
->tail
, beacon
->tail_len
);
2155 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2156 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2157 struct ieee80211_hdr
*hdr
;
2158 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2163 skb
= skb_copy(presp
, GFP_ATOMIC
);
2167 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2168 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2169 IEEE80211_STYPE_BEACON
);
2170 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2171 struct ieee80211_mgmt
*mgmt
;
2174 /* headroom, head length, tail length and maximum TIM length */
2175 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2179 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2180 mgmt
= (struct ieee80211_mgmt
*)
2181 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2182 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2183 mgmt
->frame_control
=
2184 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2185 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2186 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2187 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2188 mgmt
->u
.beacon
.beacon_int
=
2189 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2190 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2192 pos
= skb_put(skb
, 2);
2193 *pos
++ = WLAN_EID_SSID
;
2196 mesh_mgmt_ies_add(skb
, sdata
);
2202 info
= IEEE80211_SKB_CB(skb
);
2204 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2205 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2208 memset(&txrc
, 0, sizeof(txrc
));
2211 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2213 txrc
.reported_rate
.idx
= -1;
2214 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2215 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2216 txrc
.max_rate_idx
= -1;
2218 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2220 rate_control_get_rate(sdata
, NULL
, &txrc
);
2222 info
->control
.vif
= vif
;
2224 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2225 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2230 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2232 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2233 struct ieee80211_vif
*vif
)
2235 struct ieee80211_sub_if_data
*sdata
;
2236 struct ieee80211_if_managed
*ifmgd
;
2237 struct ieee80211_pspoll
*pspoll
;
2238 struct ieee80211_local
*local
;
2239 struct sk_buff
*skb
;
2241 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2244 sdata
= vif_to_sdata(vif
);
2245 ifmgd
= &sdata
->u
.mgd
;
2246 local
= sdata
->local
;
2248 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2250 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2251 "pspoll template\n", sdata
->name
);
2254 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2256 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2257 memset(pspoll
, 0, sizeof(*pspoll
));
2258 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2259 IEEE80211_STYPE_PSPOLL
);
2260 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2262 /* aid in PS-Poll has its two MSBs each set to 1 */
2263 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2265 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2266 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2270 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2272 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2273 struct ieee80211_vif
*vif
)
2275 struct ieee80211_hdr_3addr
*nullfunc
;
2276 struct ieee80211_sub_if_data
*sdata
;
2277 struct ieee80211_if_managed
*ifmgd
;
2278 struct ieee80211_local
*local
;
2279 struct sk_buff
*skb
;
2281 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2284 sdata
= vif_to_sdata(vif
);
2285 ifmgd
= &sdata
->u
.mgd
;
2286 local
= sdata
->local
;
2288 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2290 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2291 "template\n", sdata
->name
);
2294 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2296 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2298 memset(nullfunc
, 0, sizeof(*nullfunc
));
2299 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2300 IEEE80211_STYPE_NULLFUNC
|
2301 IEEE80211_FCTL_TODS
);
2302 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2303 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2304 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2308 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2310 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2311 struct ieee80211_vif
*vif
,
2312 const u8
*ssid
, size_t ssid_len
,
2313 const u8
*ie
, size_t ie_len
)
2315 struct ieee80211_sub_if_data
*sdata
;
2316 struct ieee80211_local
*local
;
2317 struct ieee80211_hdr_3addr
*hdr
;
2318 struct sk_buff
*skb
;
2322 sdata
= vif_to_sdata(vif
);
2323 local
= sdata
->local
;
2324 ie_ssid_len
= 2 + ssid_len
;
2326 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2327 ie_ssid_len
+ ie_len
);
2329 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2330 "request template\n", sdata
->name
);
2334 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2336 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2337 memset(hdr
, 0, sizeof(*hdr
));
2338 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2339 IEEE80211_STYPE_PROBE_REQ
);
2340 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2341 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2342 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2344 pos
= skb_put(skb
, ie_ssid_len
);
2345 *pos
++ = WLAN_EID_SSID
;
2348 memcpy(pos
, ssid
, ssid_len
);
2352 pos
= skb_put(skb
, ie_len
);
2353 memcpy(pos
, ie
, ie_len
);
2358 EXPORT_SYMBOL(ieee80211_probereq_get
);
2360 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2361 const void *frame
, size_t frame_len
,
2362 const struct ieee80211_tx_info
*frame_txctl
,
2363 struct ieee80211_rts
*rts
)
2365 const struct ieee80211_hdr
*hdr
= frame
;
2367 rts
->frame_control
=
2368 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2369 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2371 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2372 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2374 EXPORT_SYMBOL(ieee80211_rts_get
);
2376 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2377 const void *frame
, size_t frame_len
,
2378 const struct ieee80211_tx_info
*frame_txctl
,
2379 struct ieee80211_cts
*cts
)
2381 const struct ieee80211_hdr
*hdr
= frame
;
2383 cts
->frame_control
=
2384 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2385 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2386 frame_len
, frame_txctl
);
2387 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2389 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2392 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2393 struct ieee80211_vif
*vif
)
2395 struct ieee80211_local
*local
= hw_to_local(hw
);
2396 struct sk_buff
*skb
= NULL
;
2397 struct sta_info
*sta
;
2398 struct ieee80211_tx_data tx
;
2399 struct ieee80211_sub_if_data
*sdata
;
2400 struct ieee80211_if_ap
*bss
= NULL
;
2401 struct beacon_data
*beacon
;
2402 struct ieee80211_tx_info
*info
;
2404 sdata
= vif_to_sdata(vif
);
2408 beacon
= rcu_dereference(bss
->beacon
);
2410 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2413 if (bss
->dtim_count
!= 0)
2414 goto out
; /* send buffered bc/mc only after DTIM beacon */
2417 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2420 local
->total_ps_buffered
--;
2422 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2423 struct ieee80211_hdr
*hdr
=
2424 (struct ieee80211_hdr
*) skb
->data
;
2425 /* more buffered multicast/broadcast frames ==> set
2426 * MoreData flag in IEEE 802.11 header to inform PS
2428 hdr
->frame_control
|=
2429 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2432 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2434 dev_kfree_skb_any(skb
);
2437 info
= IEEE80211_SKB_CB(skb
);
2440 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2441 tx
.channel
= local
->hw
.conf
.channel
;
2442 info
->band
= tx
.channel
->band
;
2444 if (invoke_tx_handlers(&tx
))
2451 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2453 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2455 skb_set_mac_header(skb
, 0);
2456 skb_set_network_header(skb
, 0);
2457 skb_set_transport_header(skb
, 0);
2459 /* send all internal mgmt frames on VO */
2460 skb_set_queue_mapping(skb
, 0);
2463 * The other path calling ieee80211_xmit is from the tasklet,
2464 * and while we can handle concurrent transmissions locking
2465 * requirements are that we do not come into tx with bhs on.
2468 ieee80211_xmit(sdata
, skb
);