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 is_multicast_ether_addr(hdr
->addr1
) &&
517 ieee80211_is_robust_mgmt_frame(hdr
) &&
518 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
520 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
522 else if (tx
->sdata
->drop_unencrypted
&&
523 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
524 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
525 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
526 (ieee80211_is_action(hdr
->frame_control
) &&
527 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
528 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
534 bool skip_hw
= false;
536 tx
->key
->tx_rx_count
++;
537 /* TODO: add threshold stuff again */
539 switch (tx
->key
->conf
.alg
) {
541 if (ieee80211_is_auth(hdr
->frame_control
))
544 if (!ieee80211_is_data_present(hdr
->frame_control
))
548 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
549 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
553 skip_hw
= (tx
->key
->conf
.flags
&
554 IEEE80211_KEY_FLAG_SW_MGMT
) &&
555 ieee80211_is_mgmt(hdr
->frame_control
);
558 if (!ieee80211_is_mgmt(hdr
->frame_control
))
563 if (!skip_hw
&& tx
->key
&&
564 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
565 info
->control
.hw_key
= &tx
->key
->conf
;
571 static ieee80211_tx_result debug_noinline
572 ieee80211_tx_h_sta(struct ieee80211_tx_data
*tx
)
574 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
576 if (tx
->sta
&& tx
->sta
->uploaded
)
577 info
->control
.sta
= &tx
->sta
->sta
;
582 static ieee80211_tx_result debug_noinline
583 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
585 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
586 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
587 struct ieee80211_supported_band
*sband
;
588 struct ieee80211_rate
*rate
;
590 bool inval
= false, rts
= false, short_preamble
= false;
591 struct ieee80211_tx_rate_control txrc
;
594 memset(&txrc
, 0, sizeof(txrc
));
596 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
598 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
599 tx
->local
->hw
.wiphy
->frag_threshold
);
601 /* set up the tx rate control struct we give the RC algo */
602 txrc
.hw
= local_to_hw(tx
->local
);
604 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
606 txrc
.reported_rate
.idx
= -1;
607 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
608 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
609 txrc
.max_rate_idx
= -1;
611 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
612 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
614 /* set up RTS protection if desired */
615 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
616 txrc
.rts
= rts
= true;
620 * Use short preamble if the BSS can handle it, but not for
621 * management frames unless we know the receiver can handle
622 * that -- the management frame might be to a station that
623 * just wants a probe response.
625 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
626 (ieee80211_is_data(hdr
->frame_control
) ||
627 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
628 txrc
.short_preamble
= short_preamble
= true;
630 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
633 * Lets not bother rate control if we're associated and cannot
634 * talk to the sta. This should not happen.
636 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
637 (sta_flags
& WLAN_STA_ASSOC
) &&
638 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
639 "%s: Dropped data frame as no usable bitrate found while "
640 "scanning and associated. Target station: "
641 "%pM on %d GHz band\n",
642 tx
->sdata
->name
, hdr
->addr1
,
643 tx
->channel
->band
? 5 : 2))
647 * If we're associated with the sta at this point we know we can at
648 * least send the frame at the lowest bit rate.
650 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
652 if (unlikely(info
->control
.rates
[0].idx
< 0))
655 if (txrc
.reported_rate
.idx
< 0)
656 txrc
.reported_rate
= info
->control
.rates
[0];
659 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
661 if (unlikely(!info
->control
.rates
[0].count
))
662 info
->control
.rates
[0].count
= 1;
664 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
665 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
666 info
->control
.rates
[0].count
= 1;
668 if (is_multicast_ether_addr(hdr
->addr1
)) {
670 * XXX: verify the rate is in the basic rateset
676 * set up the RTS/CTS rate as the fastest basic rate
677 * that is not faster than the data rate
679 * XXX: Should this check all retry rates?
681 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
684 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
686 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
687 /* must be a basic rate */
688 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
690 /* must not be faster than the data rate */
691 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
694 if (sband
->bitrates
[baserate
].bitrate
<
695 sband
->bitrates
[i
].bitrate
)
699 info
->control
.rts_cts_rate_idx
= baserate
;
702 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
704 * make sure there's no valid rate following
705 * an invalid one, just in case drivers don't
706 * take the API seriously to stop at -1.
709 info
->control
.rates
[i
].idx
= -1;
712 if (info
->control
.rates
[i
].idx
< 0) {
718 * For now assume MCS is already set up correctly, this
721 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
722 WARN_ON(info
->control
.rates
[i
].idx
> 76);
726 /* set up RTS protection if desired */
728 info
->control
.rates
[i
].flags
|=
729 IEEE80211_TX_RC_USE_RTS_CTS
;
732 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
733 sband
->n_bitrates
)) {
734 info
->control
.rates
[i
].idx
= -1;
738 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
740 /* set up short preamble */
741 if (short_preamble
&&
742 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
743 info
->control
.rates
[i
].flags
|=
744 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
746 /* set up G protection */
747 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
748 rate
->flags
& IEEE80211_RATE_ERP_G
)
749 info
->control
.rates
[i
].flags
|=
750 IEEE80211_TX_RC_USE_CTS_PROTECT
;
756 static ieee80211_tx_result debug_noinline
757 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
759 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
760 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
766 * Packet injection may want to control the sequence
767 * number, if we have no matching interface then we
768 * neither assign one ourselves nor ask the driver to.
770 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
773 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
776 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
780 * Anything but QoS data that has a sequence number field
781 * (is long enough) gets a sequence number from the global
784 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
785 /* driver should assign sequence number */
786 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
787 /* for pure STA mode without beacons, we can do it */
788 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
789 tx
->sdata
->sequence_number
+= 0x10;
794 * This should be true for injected/management frames only, for
795 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
796 * above since they are not QoS-data frames.
801 /* include per-STA, per-TID sequence counter */
803 qc
= ieee80211_get_qos_ctl(hdr
);
804 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
805 seq
= &tx
->sta
->tid_seq
[tid
];
807 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
809 /* Increase the sequence number. */
810 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
815 static int ieee80211_fragment(struct ieee80211_local
*local
,
816 struct sk_buff
*skb
, int hdrlen
,
819 struct sk_buff
*tail
= skb
, *tmp
;
820 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
821 int pos
= hdrlen
+ per_fragm
;
822 int rem
= skb
->len
- hdrlen
- per_fragm
;
824 if (WARN_ON(rem
< 0))
828 int fraglen
= per_fragm
;
833 tmp
= dev_alloc_skb(local
->tx_headroom
+
835 IEEE80211_ENCRYPT_HEADROOM
+
836 IEEE80211_ENCRYPT_TAILROOM
);
841 skb_reserve(tmp
, local
->tx_headroom
+
842 IEEE80211_ENCRYPT_HEADROOM
);
843 /* copy control information */
844 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
845 skb_copy_queue_mapping(tmp
, skb
);
846 tmp
->priority
= skb
->priority
;
849 /* copy header and data */
850 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
851 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
856 skb
->len
= hdrlen
+ per_fragm
;
860 static ieee80211_tx_result debug_noinline
861 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
863 struct sk_buff
*skb
= tx
->skb
;
864 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
865 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
866 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
870 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
874 * Warn when submitting a fragmented A-MPDU frame and drop it.
875 * This scenario is handled in ieee80211_tx_prepare but extra
876 * caution taken here as fragmented ampdu may cause Tx stop.
878 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
881 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
883 /* internal error, why is TX_FRAGMENTED set? */
884 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
888 * Now fragment the frame. This will allocate all the fragments and
889 * chain them (using skb as the first fragment) to skb->next.
890 * During transmission, we will remove the successfully transmitted
891 * fragments from this list. When the low-level driver rejects one
892 * of the fragments then we will simply pretend to accept the skb
893 * but store it away as pending.
895 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
898 /* update duration/seq/flags of fragments */
902 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
904 hdr
= (void *)skb
->data
;
905 info
= IEEE80211_SKB_CB(skb
);
908 hdr
->frame_control
|= morefrags
;
909 next_len
= skb
->next
->len
;
911 * No multi-rate retries for fragmented frames, that
912 * would completely throw off the NAV at other STAs.
914 info
->control
.rates
[1].idx
= -1;
915 info
->control
.rates
[2].idx
= -1;
916 info
->control
.rates
[3].idx
= -1;
917 info
->control
.rates
[4].idx
= -1;
918 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
919 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
921 hdr
->frame_control
&= ~morefrags
;
924 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
925 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
927 } while ((skb
= skb
->next
));
932 static ieee80211_tx_result debug_noinline
933 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
935 struct sk_buff
*skb
= tx
->skb
;
940 tx
->sta
->tx_packets
++;
942 tx
->sta
->tx_fragments
++;
943 tx
->sta
->tx_bytes
+= skb
->len
;
944 } while ((skb
= skb
->next
));
949 static ieee80211_tx_result debug_noinline
950 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
955 switch (tx
->key
->conf
.alg
) {
957 return ieee80211_crypto_wep_encrypt(tx
);
959 return ieee80211_crypto_tkip_encrypt(tx
);
961 return ieee80211_crypto_ccmp_encrypt(tx
);
963 return ieee80211_crypto_aes_cmac_encrypt(tx
);
971 static ieee80211_tx_result debug_noinline
972 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
974 struct sk_buff
*skb
= tx
->skb
;
975 struct ieee80211_hdr
*hdr
;
980 hdr
= (void *) skb
->data
;
981 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
982 break; /* must not overwrite AID */
983 next_len
= skb
->next
? skb
->next
->len
: 0;
984 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
987 ieee80211_duration(tx
, group_addr
, next_len
);
988 } while ((skb
= skb
->next
));
993 /* actual transmit path */
996 * deal with packet injection down monitor interface
997 * with Radiotap Header -- only called for monitor mode interface
999 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1000 struct sk_buff
*skb
)
1003 * this is the moment to interpret and discard the radiotap header that
1004 * must be at the start of the packet injected in Monitor mode
1006 * Need to take some care with endian-ness since radiotap
1007 * args are little-endian
1010 struct ieee80211_radiotap_iterator iterator
;
1011 struct ieee80211_radiotap_header
*rthdr
=
1012 (struct ieee80211_radiotap_header
*) skb
->data
;
1013 struct ieee80211_supported_band
*sband
;
1014 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1015 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1018 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
1020 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1021 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1024 * for every radiotap entry that is present
1025 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1026 * entries present, or -EINVAL on error)
1030 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1035 /* see if this argument is something we can use */
1036 switch (iterator
.this_arg_index
) {
1038 * You must take care when dereferencing iterator.this_arg
1039 * for multibyte types... the pointer is not aligned. Use
1040 * get_unaligned((type *)iterator.this_arg) to dereference
1041 * iterator.this_arg for type "type" safely on all arches.
1043 case IEEE80211_RADIOTAP_FLAGS
:
1044 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1046 * this indicates that the skb we have been
1047 * handed has the 32-bit FCS CRC at the end...
1048 * we should react to that by snipping it off
1049 * because it will be recomputed and added
1052 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1055 skb_trim(skb
, skb
->len
- FCS_LEN
);
1057 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1058 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1059 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1060 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1064 * Please update the file
1065 * Documentation/networking/mac80211-injection.txt
1066 * when parsing new fields here.
1074 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1078 * remove the radiotap header
1079 * iterator->_max_length was sanity-checked against
1080 * skb->len by iterator init
1082 skb_pull(skb
, iterator
._max_length
);
1090 static ieee80211_tx_result
1091 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1092 struct ieee80211_tx_data
*tx
,
1093 struct sk_buff
*skb
)
1095 struct ieee80211_local
*local
= sdata
->local
;
1096 struct ieee80211_hdr
*hdr
;
1097 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1100 bool queued
= false;
1102 memset(tx
, 0, sizeof(*tx
));
1106 tx
->channel
= local
->hw
.conf
.channel
;
1108 * Set this flag (used below to indicate "automatic fragmentation"),
1109 * it will be cleared/left by radiotap as desired.
1111 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1113 /* process and remove the injection radiotap header */
1114 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1115 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1119 * __ieee80211_parse_tx_radiotap has now removed
1120 * the radiotap header that was present and pre-filled
1121 * 'tx' with tx control information.
1123 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1127 * If this flag is set to true anywhere, and we get here,
1128 * we are doing the needed processing, so remove the flag
1131 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1133 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1135 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1136 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1137 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1139 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1140 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1143 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1145 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1146 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1147 struct tid_ampdu_tx
*tid_tx
;
1149 qc
= ieee80211_get_qos_ctl(hdr
);
1150 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1152 spin_lock(&tx
->sta
->lock
);
1154 * XXX: This spinlock could be fairly expensive, but see the
1155 * comment in agg-tx.c:ieee80211_agg_tx_operational().
1156 * One way to solve this would be to do something RCU-like
1157 * for managing the tid_tx struct and using atomic bitops
1158 * for the actual state -- by introducing an actual
1159 * 'operational' bit that would be possible. It would
1160 * require changing ieee80211_agg_tx_operational() to
1161 * set that bit, and changing the way tid_tx is managed
1162 * everywhere, including races between that bit and
1163 * tid_tx going away (tid_tx being added can be easily
1164 * committed to memory before the 'operational' bit).
1166 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1167 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
1168 if (*state
== HT_AGG_STATE_OPERATIONAL
) {
1169 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1170 } else if (*state
!= HT_AGG_STATE_IDLE
) {
1173 info
->control
.vif
= &sdata
->vif
;
1174 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1175 __skb_queue_tail(&tid_tx
->pending
, skb
);
1177 spin_unlock(&tx
->sta
->lock
);
1179 if (unlikely(queued
))
1183 if (is_multicast_ether_addr(hdr
->addr1
)) {
1184 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1185 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1187 tx
->flags
|= IEEE80211_TX_UNICAST
;
1188 if (unlikely(local
->wifi_wme_noack_test
))
1189 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1191 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1194 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1195 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1196 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1197 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1198 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1200 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1204 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1205 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1206 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1208 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1209 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1210 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1211 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1213 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1218 static int __ieee80211_tx(struct ieee80211_local
*local
,
1219 struct sk_buff
**skbp
,
1220 struct sta_info
*sta
,
1223 struct sk_buff
*skb
= *skbp
, *next
;
1224 struct ieee80211_tx_info
*info
;
1225 struct ieee80211_sub_if_data
*sdata
;
1226 unsigned long flags
;
1231 int q
= skb_get_queue_mapping(skb
);
1233 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1234 ret
= IEEE80211_TX_OK
;
1235 if (local
->queue_stop_reasons
[q
] ||
1236 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1237 ret
= IEEE80211_TX_PENDING
;
1238 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1239 if (ret
!= IEEE80211_TX_OK
)
1242 info
= IEEE80211_SKB_CB(skb
);
1245 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1246 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1252 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1254 sdata
= vif_to_sdata(info
->control
.vif
);
1256 switch (sdata
->vif
.type
) {
1257 case NL80211_IFTYPE_MONITOR
:
1258 info
->control
.vif
= NULL
;
1260 case NL80211_IFTYPE_AP_VLAN
:
1261 info
->control
.vif
= &container_of(sdata
->bss
,
1262 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1269 ret
= drv_tx(local
, skb
);
1270 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1274 if (ret
!= NETDEV_TX_OK
) {
1275 info
->control
.vif
= &sdata
->vif
;
1276 return IEEE80211_TX_AGAIN
;
1280 ieee80211_led_tx(local
, 1);
1284 return IEEE80211_TX_OK
;
1288 * Invoke TX handlers, return 0 on success and non-zero if the
1289 * frame was dropped or queued.
1291 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1293 struct sk_buff
*skb
= tx
->skb
;
1294 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1295 ieee80211_tx_result res
= TX_DROP
;
1297 #define CALL_TXH(txh) \
1300 if (res != TX_CONTINUE) \
1304 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1305 CALL_TXH(ieee80211_tx_h_check_assoc
);
1306 CALL_TXH(ieee80211_tx_h_ps_buf
);
1307 CALL_TXH(ieee80211_tx_h_select_key
);
1308 CALL_TXH(ieee80211_tx_h_sta
);
1309 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1310 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1312 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1315 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1316 CALL_TXH(ieee80211_tx_h_sequence
);
1317 CALL_TXH(ieee80211_tx_h_fragment
);
1318 /* handlers after fragment must be aware of tx info fragmentation! */
1319 CALL_TXH(ieee80211_tx_h_stats
);
1320 CALL_TXH(ieee80211_tx_h_encrypt
);
1321 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1325 if (unlikely(res
== TX_DROP
)) {
1326 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1328 struct sk_buff
*next
;
1335 } else if (unlikely(res
== TX_QUEUED
)) {
1336 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1343 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1344 struct sk_buff
*skb
, bool txpending
)
1346 struct ieee80211_local
*local
= sdata
->local
;
1347 struct ieee80211_tx_data tx
;
1348 ieee80211_tx_result res_prepare
;
1349 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1350 struct sk_buff
*next
;
1351 unsigned long flags
;
1355 queue
= skb_get_queue_mapping(skb
);
1357 if (unlikely(skb
->len
< 10)) {
1364 /* initialises tx */
1365 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1367 if (unlikely(res_prepare
== TX_DROP
)) {
1371 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1376 tx
.channel
= local
->hw
.conf
.channel
;
1377 info
->band
= tx
.channel
->band
;
1379 if (invoke_tx_handlers(&tx
))
1384 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1386 case IEEE80211_TX_OK
:
1388 case IEEE80211_TX_AGAIN
:
1390 * Since there are no fragmented frames on A-MPDU
1391 * queues, there's no reason for a driver to reject
1392 * a frame there, warn and drop it.
1394 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1397 case IEEE80211_TX_PENDING
:
1400 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1402 if (local
->queue_stop_reasons
[queue
] ||
1403 !skb_queue_empty(&local
->pending
[queue
])) {
1405 * if queue is stopped, queue up frames for later
1406 * transmission from the tasklet
1411 if (unlikely(txpending
))
1412 __skb_queue_head(&local
->pending
[queue
],
1415 __skb_queue_tail(&local
->pending
[queue
],
1417 } while ((skb
= next
));
1419 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1423 * otherwise retry, but this is a race condition or
1424 * a driver bug (which we warn about if it persists)
1426 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1430 if (WARN(retries
> 10, "tx refused but queue active\n"))
1450 /* device xmit handlers */
1452 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1453 struct sk_buff
*skb
,
1454 int head_need
, bool may_encrypt
)
1459 * This could be optimised, devices that do full hardware
1460 * crypto (including TKIP MMIC) need no tailroom... But we
1461 * have no drivers for such devices currently.
1464 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1465 tail_need
-= skb_tailroom(skb
);
1466 tail_need
= max_t(int, tail_need
, 0);
1469 if (head_need
|| tail_need
) {
1470 /* Sorry. Can't account for this any more */
1474 if (skb_header_cloned(skb
))
1475 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1477 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1479 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1480 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1481 wiphy_name(local
->hw
.wiphy
));
1485 /* update truesize too */
1486 skb
->truesize
+= head_need
+ tail_need
;
1491 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1492 struct sk_buff
*skb
)
1494 struct ieee80211_local
*local
= sdata
->local
;
1495 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1496 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1497 struct ieee80211_sub_if_data
*tmp_sdata
;
1503 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1507 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1508 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1510 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1511 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1512 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1514 /* check the header is complete in the frame */
1515 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1517 * We process outgoing injected frames that have a
1518 * local address we handle as though they are our
1520 * This code here isn't entirely correct, the local
1521 * MAC address is not necessarily enough to find
1522 * the interface to use; for that proper VLAN/WDS
1523 * support we will need a different mechanism.
1526 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1528 if (!ieee80211_sdata_running(tmp_sdata
))
1530 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1532 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1541 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1543 headroom
= local
->tx_headroom
;
1545 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1546 headroom
-= skb_headroom(skb
);
1547 headroom
= max_t(int, 0, headroom
);
1549 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1555 info
->control
.vif
= &sdata
->vif
;
1557 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1558 ieee80211_is_data(hdr
->frame_control
) &&
1559 !is_multicast_ether_addr(hdr
->addr1
))
1560 if (mesh_nexthop_lookup(skb
, sdata
)) {
1561 /* skb queued: don't free */
1566 ieee80211_set_qos_hdr(local
, skb
);
1567 ieee80211_tx(sdata
, skb
, false);
1571 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1572 struct net_device
*dev
)
1574 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1575 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1576 struct ieee80211_radiotap_header
*prthdr
=
1577 (struct ieee80211_radiotap_header
*)skb
->data
;
1578 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1582 * Frame injection is not allowed if beaconing is not allowed
1583 * or if we need radar detection. Beaconing is usually not allowed when
1584 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1585 * Passive scan is also used in world regulatory domains where
1586 * your country is not known and as such it should be treated as
1587 * NO TX unless the channel is explicitly allowed in which case
1588 * your current regulatory domain would not have the passive scan
1591 * Since AP mode uses monitor interfaces to inject/TX management
1592 * frames we can make AP mode the exception to this rule once it
1593 * supports radar detection as its implementation can deal with
1594 * radar detection by itself. We can do that later by adding a
1595 * monitor flag interfaces used for AP support.
1597 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1598 IEEE80211_CHAN_PASSIVE_SCAN
)))
1601 /* check for not even having the fixed radiotap header part */
1602 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1603 goto fail
; /* too short to be possibly valid */
1605 /* is it a header version we can trust to find length from? */
1606 if (unlikely(prthdr
->it_version
))
1607 goto fail
; /* only version 0 is supported */
1609 /* then there must be a radiotap header with a length we can use */
1610 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1612 /* does the skb contain enough to deliver on the alleged length? */
1613 if (unlikely(skb
->len
< len_rthdr
))
1614 goto fail
; /* skb too short for claimed rt header extent */
1617 * fix up the pointers accounting for the radiotap
1618 * header still being in there. We are being given
1619 * a precooked IEEE80211 header so no need for
1622 skb_set_mac_header(skb
, len_rthdr
);
1624 * these are just fixed to the end of the rt area since we
1625 * don't have any better information and at this point, nobody cares
1627 skb_set_network_header(skb
, len_rthdr
);
1628 skb_set_transport_header(skb
, len_rthdr
);
1630 memset(info
, 0, sizeof(*info
));
1632 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1634 /* pass the radiotap header up to xmit */
1635 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1636 return NETDEV_TX_OK
;
1640 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1644 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1645 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1646 * @skb: packet to be sent
1647 * @dev: incoming interface
1649 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1650 * not be freed, and caller is responsible for either retrying later or freeing
1653 * This function takes in an Ethernet header and encapsulates it with suitable
1654 * IEEE 802.11 header based on which interface the packet is coming in. The
1655 * encapsulated packet will then be passed to master interface, wlan#.11, for
1656 * transmission (through low-level driver).
1658 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1659 struct net_device
*dev
)
1661 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1662 struct ieee80211_local
*local
= sdata
->local
;
1663 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1664 int ret
= NETDEV_TX_BUSY
, head_need
;
1665 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1667 struct ieee80211_hdr hdr
;
1668 struct ieee80211s_hdr mesh_hdr
;
1669 const u8
*encaps_data
;
1670 int encaps_len
, skip_header_bytes
;
1672 struct sta_info
*sta
= NULL
;
1675 if (unlikely(skb
->len
< ETH_HLEN
)) {
1680 nh_pos
= skb_network_header(skb
) - skb
->data
;
1681 h_pos
= skb_transport_header(skb
) - skb
->data
;
1683 /* convert Ethernet header to proper 802.11 header (based on
1684 * operation mode) */
1685 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1686 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1688 switch (sdata
->vif
.type
) {
1689 case NL80211_IFTYPE_AP_VLAN
:
1691 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1693 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1695 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1696 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1697 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1698 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1700 sta_flags
= get_sta_flags(sta
);
1706 case NL80211_IFTYPE_AP
:
1707 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1709 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1710 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1711 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1714 case NL80211_IFTYPE_WDS
:
1715 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1717 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1718 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1719 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1720 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1723 #ifdef CONFIG_MAC80211_MESH
1724 case NL80211_IFTYPE_MESH_POINT
:
1725 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1726 /* Do not send frames with mesh_ttl == 0 */
1727 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1732 if (compare_ether_addr(sdata
->vif
.addr
,
1733 skb
->data
+ ETH_ALEN
) == 0) {
1734 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1735 skb
->data
, skb
->data
+ ETH_ALEN
);
1736 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1737 sdata
, NULL
, NULL
, NULL
);
1739 /* packet from other interface */
1740 struct mesh_path
*mppath
;
1741 int is_mesh_mcast
= 1;
1745 if (is_multicast_ether_addr(skb
->data
))
1746 /* DA TA mSA AE:SA */
1747 mesh_da
= skb
->data
;
1749 static const u8 bcast
[ETH_ALEN
] =
1750 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1752 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1754 /* RA TA mDA mSA AE:DA SA */
1755 mesh_da
= mppath
->mpp
;
1758 /* DA TA mSA AE:SA */
1762 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1763 mesh_da
, sdata
->vif
.addr
);
1767 ieee80211_new_mesh_header(&mesh_hdr
,
1769 skb
->data
+ ETH_ALEN
,
1774 ieee80211_new_mesh_header(&mesh_hdr
,
1778 skb
->data
+ ETH_ALEN
);
1783 case NL80211_IFTYPE_STATION
:
1784 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1785 if (sdata
->u
.mgd
.use_4addr
&& ethertype
!= ETH_P_PAE
) {
1786 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1788 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1789 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1790 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1793 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1795 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1796 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1800 case NL80211_IFTYPE_ADHOC
:
1802 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1803 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1804 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1813 * There's no need to try to look up the destination
1814 * if it is a multicast address (which can only happen
1817 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1819 sta
= sta_info_get(sdata
, hdr
.addr1
);
1821 sta_flags
= get_sta_flags(sta
);
1825 /* receiver and we are QoS enabled, use a QoS type frame */
1826 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1827 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1832 * Drop unicast frames to unauthorised stations unless they are
1833 * EAPOL frames from the local station.
1835 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1836 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1837 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1838 !(ethertype
== ETH_P_PAE
&&
1839 compare_ether_addr(sdata
->vif
.addr
,
1840 skb
->data
+ ETH_ALEN
) == 0))) {
1841 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1842 if (net_ratelimit())
1843 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1844 " (unauthorized port)\n", dev
->name
,
1848 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1854 hdr
.frame_control
= fc
;
1855 hdr
.duration_id
= 0;
1858 skip_header_bytes
= ETH_HLEN
;
1859 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1860 encaps_data
= bridge_tunnel_header
;
1861 encaps_len
= sizeof(bridge_tunnel_header
);
1862 skip_header_bytes
-= 2;
1863 } else if (ethertype
>= 0x600) {
1864 encaps_data
= rfc1042_header
;
1865 encaps_len
= sizeof(rfc1042_header
);
1866 skip_header_bytes
-= 2;
1872 skb_pull(skb
, skip_header_bytes
);
1873 nh_pos
-= skip_header_bytes
;
1874 h_pos
-= skip_header_bytes
;
1876 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1879 * So we need to modify the skb header and hence need a copy of
1880 * that. The head_need variable above doesn't, so far, include
1881 * the needed header space that we don't need right away. If we
1882 * can, then we don't reallocate right now but only after the
1883 * frame arrives at the master device (if it does...)
1885 * If we cannot, however, then we will reallocate to include all
1886 * the ever needed space. Also, if we need to reallocate it anyway,
1887 * make it big enough for everything we may ever need.
1890 if (head_need
> 0 || skb_cloned(skb
)) {
1891 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1892 head_need
+= local
->tx_headroom
;
1893 head_need
= max_t(int, 0, head_need
);
1894 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1899 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1900 nh_pos
+= encaps_len
;
1901 h_pos
+= encaps_len
;
1904 if (meshhdrlen
> 0) {
1905 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1906 nh_pos
+= meshhdrlen
;
1907 h_pos
+= meshhdrlen
;
1910 if (ieee80211_is_data_qos(fc
)) {
1911 __le16
*qos_control
;
1913 qos_control
= (__le16
*) skb_push(skb
, 2);
1914 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1916 * Maybe we could actually set some fields here, for now just
1917 * initialise to zero to indicate no special operation.
1921 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1926 dev
->stats
.tx_packets
++;
1927 dev
->stats
.tx_bytes
+= skb
->len
;
1929 /* Update skb pointers to various headers since this modified frame
1930 * is going to go through Linux networking code that may potentially
1931 * need things like pointer to IP header. */
1932 skb_set_mac_header(skb
, 0);
1933 skb_set_network_header(skb
, nh_pos
);
1934 skb_set_transport_header(skb
, h_pos
);
1936 memset(info
, 0, sizeof(*info
));
1938 dev
->trans_start
= jiffies
;
1939 ieee80211_xmit(sdata
, skb
);
1941 return NETDEV_TX_OK
;
1944 if (ret
== NETDEV_TX_OK
)
1952 * ieee80211_clear_tx_pending may not be called in a context where
1953 * it is possible that it packets could come in again.
1955 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1959 for (i
= 0; i
< local
->hw
.queues
; i
++)
1960 skb_queue_purge(&local
->pending
[i
]);
1963 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1964 struct sk_buff
*skb
)
1966 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1967 struct ieee80211_sub_if_data
*sdata
;
1968 struct sta_info
*sta
;
1969 struct ieee80211_hdr
*hdr
;
1973 sdata
= vif_to_sdata(info
->control
.vif
);
1975 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
1976 ieee80211_tx(sdata
, skb
, true);
1978 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1979 sta
= sta_info_get(sdata
, hdr
->addr1
);
1981 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
1982 if (ret
!= IEEE80211_TX_OK
)
1990 * Transmit all pending packets. Called from tasklet.
1992 void ieee80211_tx_pending(unsigned long data
)
1994 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1995 struct ieee80211_sub_if_data
*sdata
;
1996 unsigned long flags
;
2002 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2003 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2005 * If queue is stopped by something other than due to pending
2006 * frames, or we have no pending frames, proceed to next queue.
2008 if (local
->queue_stop_reasons
[i
] ||
2009 skb_queue_empty(&local
->pending
[i
]))
2012 while (!skb_queue_empty(&local
->pending
[i
])) {
2013 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2014 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2016 if (WARN_ON(!info
->control
.vif
)) {
2021 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2024 txok
= ieee80211_tx_pending_skb(local
, skb
);
2026 __skb_queue_head(&local
->pending
[i
], skb
);
2027 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2033 if (skb_queue_empty(&local
->pending
[i
]))
2034 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2035 netif_tx_wake_queue(
2036 netdev_get_tx_queue(sdata
->dev
, i
));
2038 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2043 /* functions for drivers to get certain frames */
2045 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2046 struct sk_buff
*skb
,
2047 struct beacon_data
*beacon
)
2051 int i
, have_bits
= 0, n1
, n2
;
2053 /* Generate bitmap for TIM only if there are any STAs in power save
2055 if (atomic_read(&bss
->num_sta_ps
) > 0)
2056 /* in the hope that this is faster than
2057 * checking byte-for-byte */
2058 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2059 IEEE80211_MAX_AID
+1);
2061 if (bss
->dtim_count
== 0)
2062 bss
->dtim_count
= beacon
->dtim_period
- 1;
2066 tim
= pos
= (u8
*) skb_put(skb
, 6);
2067 *pos
++ = WLAN_EID_TIM
;
2069 *pos
++ = bss
->dtim_count
;
2070 *pos
++ = beacon
->dtim_period
;
2072 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2076 /* Find largest even number N1 so that bits numbered 1 through
2077 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2078 * (N2 + 1) x 8 through 2007 are 0. */
2080 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2087 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2094 /* Bitmap control */
2096 /* Part Virt Bitmap */
2097 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2099 tim
[1] = n2
- n1
+ 4;
2100 skb_put(skb
, n2
- n1
);
2102 *pos
++ = aid0
; /* Bitmap control */
2103 *pos
++ = 0; /* Part Virt Bitmap */
2107 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2108 struct ieee80211_vif
*vif
,
2109 u16
*tim_offset
, u16
*tim_length
)
2111 struct ieee80211_local
*local
= hw_to_local(hw
);
2112 struct sk_buff
*skb
= NULL
;
2113 struct ieee80211_tx_info
*info
;
2114 struct ieee80211_sub_if_data
*sdata
= NULL
;
2115 struct ieee80211_if_ap
*ap
= NULL
;
2116 struct beacon_data
*beacon
;
2117 struct ieee80211_supported_band
*sband
;
2118 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2119 struct ieee80211_tx_rate_control txrc
;
2121 sband
= local
->hw
.wiphy
->bands
[band
];
2125 sdata
= vif_to_sdata(vif
);
2132 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2134 beacon
= rcu_dereference(ap
->beacon
);
2137 * headroom, head length,
2138 * tail length and maximum TIM length
2140 skb
= dev_alloc_skb(local
->tx_headroom
+
2142 beacon
->tail_len
+ 256);
2146 skb_reserve(skb
, local
->tx_headroom
);
2147 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2151 * Not very nice, but we want to allow the driver to call
2152 * ieee80211_beacon_get() as a response to the set_tim()
2153 * callback. That, however, is already invoked under the
2154 * sta_lock to guarantee consistent and race-free update
2155 * of the tim bitmap in mac80211 and the driver.
2157 if (local
->tim_in_locked_section
) {
2158 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2160 unsigned long flags
;
2162 spin_lock_irqsave(&local
->sta_lock
, flags
);
2163 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2164 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2168 *tim_offset
= beacon
->head_len
;
2170 *tim_length
= skb
->len
- beacon
->head_len
;
2173 memcpy(skb_put(skb
, beacon
->tail_len
),
2174 beacon
->tail
, beacon
->tail_len
);
2177 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2178 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2179 struct ieee80211_hdr
*hdr
;
2180 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2185 skb
= skb_copy(presp
, GFP_ATOMIC
);
2189 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2190 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2191 IEEE80211_STYPE_BEACON
);
2192 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2193 struct ieee80211_mgmt
*mgmt
;
2196 /* headroom, head length, tail length and maximum TIM length */
2197 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2201 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2202 mgmt
= (struct ieee80211_mgmt
*)
2203 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2204 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2205 mgmt
->frame_control
=
2206 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2207 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2208 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2209 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2210 mgmt
->u
.beacon
.beacon_int
=
2211 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2212 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2214 pos
= skb_put(skb
, 2);
2215 *pos
++ = WLAN_EID_SSID
;
2218 mesh_mgmt_ies_add(skb
, sdata
);
2224 info
= IEEE80211_SKB_CB(skb
);
2226 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2227 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2230 memset(&txrc
, 0, sizeof(txrc
));
2233 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2235 txrc
.reported_rate
.idx
= -1;
2236 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2237 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2238 txrc
.max_rate_idx
= -1;
2240 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2242 rate_control_get_rate(sdata
, NULL
, &txrc
);
2244 info
->control
.vif
= vif
;
2246 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
2247 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2252 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2254 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2255 struct ieee80211_vif
*vif
)
2257 struct ieee80211_sub_if_data
*sdata
;
2258 struct ieee80211_if_managed
*ifmgd
;
2259 struct ieee80211_pspoll
*pspoll
;
2260 struct ieee80211_local
*local
;
2261 struct sk_buff
*skb
;
2263 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2266 sdata
= vif_to_sdata(vif
);
2267 ifmgd
= &sdata
->u
.mgd
;
2268 local
= sdata
->local
;
2270 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2272 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2273 "pspoll template\n", sdata
->name
);
2276 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2278 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2279 memset(pspoll
, 0, sizeof(*pspoll
));
2280 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2281 IEEE80211_STYPE_PSPOLL
);
2282 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2284 /* aid in PS-Poll has its two MSBs each set to 1 */
2285 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2287 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2288 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2292 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2294 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2295 struct ieee80211_vif
*vif
)
2297 struct ieee80211_hdr_3addr
*nullfunc
;
2298 struct ieee80211_sub_if_data
*sdata
;
2299 struct ieee80211_if_managed
*ifmgd
;
2300 struct ieee80211_local
*local
;
2301 struct sk_buff
*skb
;
2303 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2306 sdata
= vif_to_sdata(vif
);
2307 ifmgd
= &sdata
->u
.mgd
;
2308 local
= sdata
->local
;
2310 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2312 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2313 "template\n", sdata
->name
);
2316 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2318 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2320 memset(nullfunc
, 0, sizeof(*nullfunc
));
2321 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2322 IEEE80211_STYPE_NULLFUNC
|
2323 IEEE80211_FCTL_TODS
);
2324 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2325 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2326 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2330 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2332 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2333 struct ieee80211_vif
*vif
,
2334 const u8
*ssid
, size_t ssid_len
,
2335 const u8
*ie
, size_t ie_len
)
2337 struct ieee80211_sub_if_data
*sdata
;
2338 struct ieee80211_local
*local
;
2339 struct ieee80211_hdr_3addr
*hdr
;
2340 struct sk_buff
*skb
;
2344 sdata
= vif_to_sdata(vif
);
2345 local
= sdata
->local
;
2346 ie_ssid_len
= 2 + ssid_len
;
2348 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2349 ie_ssid_len
+ ie_len
);
2351 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2352 "request template\n", sdata
->name
);
2356 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2358 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2359 memset(hdr
, 0, sizeof(*hdr
));
2360 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2361 IEEE80211_STYPE_PROBE_REQ
);
2362 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2363 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2364 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2366 pos
= skb_put(skb
, ie_ssid_len
);
2367 *pos
++ = WLAN_EID_SSID
;
2370 memcpy(pos
, ssid
, ssid_len
);
2374 pos
= skb_put(skb
, ie_len
);
2375 memcpy(pos
, ie
, ie_len
);
2380 EXPORT_SYMBOL(ieee80211_probereq_get
);
2382 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2383 const void *frame
, size_t frame_len
,
2384 const struct ieee80211_tx_info
*frame_txctl
,
2385 struct ieee80211_rts
*rts
)
2387 const struct ieee80211_hdr
*hdr
= frame
;
2389 rts
->frame_control
=
2390 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2391 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2393 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2394 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2396 EXPORT_SYMBOL(ieee80211_rts_get
);
2398 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2399 const void *frame
, size_t frame_len
,
2400 const struct ieee80211_tx_info
*frame_txctl
,
2401 struct ieee80211_cts
*cts
)
2403 const struct ieee80211_hdr
*hdr
= frame
;
2405 cts
->frame_control
=
2406 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2407 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2408 frame_len
, frame_txctl
);
2409 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2411 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2414 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2415 struct ieee80211_vif
*vif
)
2417 struct ieee80211_local
*local
= hw_to_local(hw
);
2418 struct sk_buff
*skb
= NULL
;
2419 struct sta_info
*sta
;
2420 struct ieee80211_tx_data tx
;
2421 struct ieee80211_sub_if_data
*sdata
;
2422 struct ieee80211_if_ap
*bss
= NULL
;
2423 struct beacon_data
*beacon
;
2424 struct ieee80211_tx_info
*info
;
2426 sdata
= vif_to_sdata(vif
);
2430 beacon
= rcu_dereference(bss
->beacon
);
2432 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2435 if (bss
->dtim_count
!= 0)
2436 goto out
; /* send buffered bc/mc only after DTIM beacon */
2439 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2442 local
->total_ps_buffered
--;
2444 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2445 struct ieee80211_hdr
*hdr
=
2446 (struct ieee80211_hdr
*) skb
->data
;
2447 /* more buffered multicast/broadcast frames ==> set
2448 * MoreData flag in IEEE 802.11 header to inform PS
2450 hdr
->frame_control
|=
2451 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2454 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2456 dev_kfree_skb_any(skb
);
2459 info
= IEEE80211_SKB_CB(skb
);
2462 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2463 tx
.channel
= local
->hw
.conf
.channel
;
2464 info
->band
= tx
.channel
->band
;
2466 if (invoke_tx_handlers(&tx
))
2473 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2475 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2477 skb_set_mac_header(skb
, 0);
2478 skb_set_network_header(skb
, 0);
2479 skb_set_transport_header(skb
, 0);
2481 /* send all internal mgmt frames on VO */
2482 skb_set_queue_mapping(skb
, 0);
2485 * The other path calling ieee80211_xmit is from the tasklet,
2486 * and while we can handle concurrent transmissions locking
2487 * requirements are that we do not come into tx with bhs on.
2490 ieee80211_xmit(sdata
, skb
);