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
;
432 struct ieee80211_local
*local
= tx
->local
;
436 ieee80211_is_probe_resp(hdr
->frame_control
) ||
437 ieee80211_is_auth(hdr
->frame_control
) ||
438 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
439 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
442 staflags
= get_sta_flags(sta
);
444 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
445 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
446 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
447 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
449 sta
->sta
.addr
, sta
->sta
.aid
,
450 skb_queue_len(&sta
->ps_tx_buf
));
451 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
452 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
453 purge_old_ps_buffers(tx
->local
);
454 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
455 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
456 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
457 if (net_ratelimit()) {
458 printk(KERN_DEBUG
"%s: STA %pM TX "
459 "buffer full - dropping oldest frame\n",
460 tx
->sdata
->name
, sta
->sta
.addr
);
465 tx
->local
->total_ps_buffered
++;
468 * Queue frame to be sent after STA wakes up/polls,
469 * but don't set the TIM bit if the driver is blocking
470 * wakeup or poll response transmissions anyway.
472 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
473 !(staflags
& WLAN_STA_PS_DRIVER
))
474 sta_info_set_tim_bit(sta
);
476 info
->control
.jiffies
= jiffies
;
477 info
->control
.vif
= &tx
->sdata
->vif
;
478 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
479 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
481 if (!timer_pending(&local
->sta_cleanup
))
482 mod_timer(&local
->sta_cleanup
,
483 round_jiffies(jiffies
+
484 STA_INFO_CLEANUP_INTERVAL
));
488 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
489 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
490 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
491 "set -> send frame\n", tx
->sdata
->name
,
494 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
499 static ieee80211_tx_result debug_noinline
500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
502 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
505 if (tx
->flags
& IEEE80211_TX_UNICAST
)
506 return ieee80211_tx_h_unicast_ps_buf(tx
);
508 return ieee80211_tx_h_multicast_ps_buf(tx
);
511 static ieee80211_tx_result debug_noinline
512 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
514 struct ieee80211_key
*key
= NULL
;
515 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
516 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
518 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
520 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
522 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
523 is_multicast_ether_addr(hdr
->addr1
) &&
524 ieee80211_is_robust_mgmt_frame(hdr
) &&
525 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
527 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
529 else if (tx
->sdata
->drop_unencrypted
&&
530 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
531 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
532 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
533 (ieee80211_is_action(hdr
->frame_control
) &&
534 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
535 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
541 bool skip_hw
= false;
543 tx
->key
->tx_rx_count
++;
544 /* TODO: add threshold stuff again */
546 switch (tx
->key
->conf
.alg
) {
548 if (ieee80211_is_auth(hdr
->frame_control
))
551 if (!ieee80211_is_data_present(hdr
->frame_control
))
555 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
556 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
560 skip_hw
= (tx
->key
->conf
.flags
&
561 IEEE80211_KEY_FLAG_SW_MGMT
) &&
562 ieee80211_is_mgmt(hdr
->frame_control
);
565 if (!ieee80211_is_mgmt(hdr
->frame_control
))
570 if (!skip_hw
&& tx
->key
&&
571 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
572 info
->control
.hw_key
= &tx
->key
->conf
;
578 static ieee80211_tx_result debug_noinline
579 ieee80211_tx_h_sta(struct ieee80211_tx_data
*tx
)
581 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
583 if (tx
->sta
&& tx
->sta
->uploaded
)
584 info
->control
.sta
= &tx
->sta
->sta
;
589 static ieee80211_tx_result debug_noinline
590 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
592 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
593 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
594 struct ieee80211_supported_band
*sband
;
595 struct ieee80211_rate
*rate
;
598 bool inval
= false, rts
= false, short_preamble
= false;
599 struct ieee80211_tx_rate_control txrc
;
602 memset(&txrc
, 0, sizeof(txrc
));
604 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
606 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
607 tx
->local
->hw
.wiphy
->frag_threshold
);
609 /* set up the tx rate control struct we give the RC algo */
610 txrc
.hw
= local_to_hw(tx
->local
);
612 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
614 txrc
.reported_rate
.idx
= -1;
615 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
616 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
617 txrc
.max_rate_idx
= -1;
619 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
620 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
622 /* set up RTS protection if desired */
623 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
624 txrc
.rts
= rts
= true;
628 * Use short preamble if the BSS can handle it, but not for
629 * management frames unless we know the receiver can handle
630 * that -- the management frame might be to a station that
631 * just wants a probe response.
633 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
634 (ieee80211_is_data(hdr
->frame_control
) ||
635 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
636 txrc
.short_preamble
= short_preamble
= true;
638 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
641 * Lets not bother rate control if we're associated and cannot
642 * talk to the sta. This should not happen.
644 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
645 (sta_flags
& WLAN_STA_ASSOC
) &&
646 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
647 "%s: Dropped data frame as no usable bitrate found while "
648 "scanning and associated. Target station: "
649 "%pM on %d GHz band\n",
650 tx
->sdata
->name
, hdr
->addr1
,
651 tx
->channel
->band
? 5 : 2))
655 * If we're associated with the sta at this point we know we can at
656 * least send the frame at the lowest bit rate.
658 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
660 if (unlikely(info
->control
.rates
[0].idx
< 0))
663 if (txrc
.reported_rate
.idx
< 0)
664 txrc
.reported_rate
= info
->control
.rates
[0];
667 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
669 if (unlikely(!info
->control
.rates
[0].count
))
670 info
->control
.rates
[0].count
= 1;
672 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
673 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
674 info
->control
.rates
[0].count
= 1;
676 if (is_multicast_ether_addr(hdr
->addr1
)) {
678 * XXX: verify the rate is in the basic rateset
684 * set up the RTS/CTS rate as the fastest basic rate
685 * that is not faster than the data rate
687 * XXX: Should this check all retry rates?
689 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
692 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
694 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
695 /* must be a basic rate */
696 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
698 /* must not be faster than the data rate */
699 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
702 if (sband
->bitrates
[baserate
].bitrate
<
703 sband
->bitrates
[i
].bitrate
)
707 info
->control
.rts_cts_rate_idx
= baserate
;
710 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
712 * make sure there's no valid rate following
713 * an invalid one, just in case drivers don't
714 * take the API seriously to stop at -1.
717 info
->control
.rates
[i
].idx
= -1;
720 if (info
->control
.rates
[i
].idx
< 0) {
726 * For now assume MCS is already set up correctly, this
729 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
730 WARN_ON(info
->control
.rates
[i
].idx
> 76);
734 /* set up RTS protection if desired */
736 info
->control
.rates
[i
].flags
|=
737 IEEE80211_TX_RC_USE_RTS_CTS
;
740 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
741 sband
->n_bitrates
)) {
742 info
->control
.rates
[i
].idx
= -1;
746 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
748 /* set up short preamble */
749 if (short_preamble
&&
750 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
751 info
->control
.rates
[i
].flags
|=
752 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
754 /* set up G protection */
755 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
756 rate
->flags
& IEEE80211_RATE_ERP_G
)
757 info
->control
.rates
[i
].flags
|=
758 IEEE80211_TX_RC_USE_CTS_PROTECT
;
764 static ieee80211_tx_result debug_noinline
765 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
767 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
768 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
774 * Packet injection may want to control the sequence
775 * number, if we have no matching interface then we
776 * neither assign one ourselves nor ask the driver to.
778 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
781 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
784 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
788 * Anything but QoS data that has a sequence number field
789 * (is long enough) gets a sequence number from the global
792 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
793 /* driver should assign sequence number */
794 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
795 /* for pure STA mode without beacons, we can do it */
796 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
797 tx
->sdata
->sequence_number
+= 0x10;
802 * This should be true for injected/management frames only, for
803 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
804 * above since they are not QoS-data frames.
809 /* include per-STA, per-TID sequence counter */
811 qc
= ieee80211_get_qos_ctl(hdr
);
812 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
813 seq
= &tx
->sta
->tid_seq
[tid
];
815 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
817 /* Increase the sequence number. */
818 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
823 static int ieee80211_fragment(struct ieee80211_local
*local
,
824 struct sk_buff
*skb
, int hdrlen
,
827 struct sk_buff
*tail
= skb
, *tmp
;
828 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
829 int pos
= hdrlen
+ per_fragm
;
830 int rem
= skb
->len
- hdrlen
- per_fragm
;
832 if (WARN_ON(rem
< 0))
836 int fraglen
= per_fragm
;
841 tmp
= dev_alloc_skb(local
->tx_headroom
+
843 IEEE80211_ENCRYPT_HEADROOM
+
844 IEEE80211_ENCRYPT_TAILROOM
);
849 skb_reserve(tmp
, local
->tx_headroom
+
850 IEEE80211_ENCRYPT_HEADROOM
);
851 /* copy control information */
852 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
853 skb_copy_queue_mapping(tmp
, skb
);
854 tmp
->priority
= skb
->priority
;
857 /* copy header and data */
858 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
859 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
864 skb
->len
= hdrlen
+ per_fragm
;
868 static ieee80211_tx_result debug_noinline
869 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
871 struct sk_buff
*skb
= tx
->skb
;
872 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
873 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
874 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
878 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
882 * Warn when submitting a fragmented A-MPDU frame and drop it.
883 * This scenario is handled in ieee80211_tx_prepare but extra
884 * caution taken here as fragmented ampdu may cause Tx stop.
886 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
889 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
891 /* internal error, why is TX_FRAGMENTED set? */
892 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
896 * Now fragment the frame. This will allocate all the fragments and
897 * chain them (using skb as the first fragment) to skb->next.
898 * During transmission, we will remove the successfully transmitted
899 * fragments from this list. When the low-level driver rejects one
900 * of the fragments then we will simply pretend to accept the skb
901 * but store it away as pending.
903 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
906 /* update duration/seq/flags of fragments */
910 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
912 hdr
= (void *)skb
->data
;
913 info
= IEEE80211_SKB_CB(skb
);
916 hdr
->frame_control
|= morefrags
;
917 next_len
= skb
->next
->len
;
919 * No multi-rate retries for fragmented frames, that
920 * would completely throw off the NAV at other STAs.
922 info
->control
.rates
[1].idx
= -1;
923 info
->control
.rates
[2].idx
= -1;
924 info
->control
.rates
[3].idx
= -1;
925 info
->control
.rates
[4].idx
= -1;
926 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
927 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
929 hdr
->frame_control
&= ~morefrags
;
932 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
933 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
935 } while ((skb
= skb
->next
));
940 static ieee80211_tx_result debug_noinline
941 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
943 struct sk_buff
*skb
= tx
->skb
;
948 tx
->sta
->tx_packets
++;
950 tx
->sta
->tx_fragments
++;
951 tx
->sta
->tx_bytes
+= skb
->len
;
952 } while ((skb
= skb
->next
));
957 static ieee80211_tx_result debug_noinline
958 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
963 switch (tx
->key
->conf
.alg
) {
965 return ieee80211_crypto_wep_encrypt(tx
);
967 return ieee80211_crypto_tkip_encrypt(tx
);
969 return ieee80211_crypto_ccmp_encrypt(tx
);
971 return ieee80211_crypto_aes_cmac_encrypt(tx
);
979 static ieee80211_tx_result debug_noinline
980 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
982 struct sk_buff
*skb
= tx
->skb
;
983 struct ieee80211_hdr
*hdr
;
988 hdr
= (void *) skb
->data
;
989 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
990 break; /* must not overwrite AID */
991 next_len
= skb
->next
? skb
->next
->len
: 0;
992 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
995 ieee80211_duration(tx
, group_addr
, next_len
);
996 } while ((skb
= skb
->next
));
1001 /* actual transmit path */
1004 * deal with packet injection down monitor interface
1005 * with Radiotap Header -- only called for monitor mode interface
1007 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1008 struct sk_buff
*skb
)
1011 * this is the moment to interpret and discard the radiotap header that
1012 * must be at the start of the packet injected in Monitor mode
1014 * Need to take some care with endian-ness since radiotap
1015 * args are little-endian
1018 struct ieee80211_radiotap_iterator iterator
;
1019 struct ieee80211_radiotap_header
*rthdr
=
1020 (struct ieee80211_radiotap_header
*) skb
->data
;
1021 struct ieee80211_supported_band
*sband
;
1022 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1023 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1026 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
1028 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1029 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1032 * for every radiotap entry that is present
1033 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1034 * entries present, or -EINVAL on error)
1038 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1043 /* see if this argument is something we can use */
1044 switch (iterator
.this_arg_index
) {
1046 * You must take care when dereferencing iterator.this_arg
1047 * for multibyte types... the pointer is not aligned. Use
1048 * get_unaligned((type *)iterator.this_arg) to dereference
1049 * iterator.this_arg for type "type" safely on all arches.
1051 case IEEE80211_RADIOTAP_FLAGS
:
1052 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1054 * this indicates that the skb we have been
1055 * handed has the 32-bit FCS CRC at the end...
1056 * we should react to that by snipping it off
1057 * because it will be recomputed and added
1060 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1063 skb_trim(skb
, skb
->len
- FCS_LEN
);
1065 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1066 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1067 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1068 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1072 * Please update the file
1073 * Documentation/networking/mac80211-injection.txt
1074 * when parsing new fields here.
1082 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1086 * remove the radiotap header
1087 * iterator->_max_length was sanity-checked against
1088 * skb->len by iterator init
1090 skb_pull(skb
, iterator
._max_length
);
1095 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1096 struct sk_buff
*skb
,
1097 struct ieee80211_tx_info
*info
,
1098 struct tid_ampdu_tx
*tid_tx
,
1101 bool queued
= false;
1103 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1104 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1106 spin_lock(&tx
->sta
->lock
);
1108 * Need to re-check now, because we may get here
1110 * 1) in the window during which the setup is actually
1111 * already done, but not marked yet because not all
1112 * packets are spliced over to the driver pending
1113 * queue yet -- if this happened we acquire the lock
1114 * either before or after the splice happens, but
1115 * need to recheck which of these cases happened.
1117 * 2) during session teardown, if the OPERATIONAL bit
1118 * was cleared due to the teardown but the pointer
1119 * hasn't been assigned NULL yet (or we loaded it
1120 * before it was assigned) -- in this case it may
1121 * now be NULL which means we should just let the
1122 * packet pass through because splicing the frames
1123 * back is already done.
1125 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1128 /* do nothing, let packet pass through */
1129 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1130 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1133 info
->control
.vif
= &tx
->sdata
->vif
;
1134 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1135 __skb_queue_tail(&tid_tx
->pending
, skb
);
1137 spin_unlock(&tx
->sta
->lock
);
1146 static ieee80211_tx_result
1147 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1148 struct ieee80211_tx_data
*tx
,
1149 struct sk_buff
*skb
)
1151 struct ieee80211_local
*local
= sdata
->local
;
1152 struct ieee80211_hdr
*hdr
;
1153 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1157 memset(tx
, 0, sizeof(*tx
));
1161 tx
->channel
= local
->hw
.conf
.channel
;
1163 * Set this flag (used below to indicate "automatic fragmentation"),
1164 * it will be cleared/left by radiotap as desired.
1166 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1168 /* process and remove the injection radiotap header */
1169 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1170 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1174 * __ieee80211_parse_tx_radiotap has now removed
1175 * the radiotap header that was present and pre-filled
1176 * 'tx' with tx control information.
1178 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1182 * If this flag is set to true anywhere, and we get here,
1183 * we are doing the needed processing, so remove the flag
1186 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1188 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1190 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1191 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1192 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1194 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1195 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1198 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1200 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1201 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1202 struct tid_ampdu_tx
*tid_tx
;
1204 qc
= ieee80211_get_qos_ctl(hdr
);
1205 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1207 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1211 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1214 if (unlikely(queued
))
1219 if (is_multicast_ether_addr(hdr
->addr1
)) {
1220 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1221 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1223 tx
->flags
|= IEEE80211_TX_UNICAST
;
1224 if (unlikely(local
->wifi_wme_noack_test
))
1225 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1227 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1230 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1231 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1232 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1233 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1234 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1236 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1240 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1241 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1242 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1244 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1245 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1246 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1247 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1249 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1254 static int __ieee80211_tx(struct ieee80211_local
*local
,
1255 struct sk_buff
**skbp
,
1256 struct sta_info
*sta
,
1259 struct sk_buff
*skb
= *skbp
, *next
;
1260 struct ieee80211_tx_info
*info
;
1261 struct ieee80211_sub_if_data
*sdata
;
1262 unsigned long flags
;
1267 int q
= skb_get_queue_mapping(skb
);
1269 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1270 ret
= IEEE80211_TX_OK
;
1271 if (local
->queue_stop_reasons
[q
] ||
1272 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1273 ret
= IEEE80211_TX_PENDING
;
1274 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1275 if (ret
!= IEEE80211_TX_OK
)
1278 info
= IEEE80211_SKB_CB(skb
);
1281 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1282 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1288 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1290 sdata
= vif_to_sdata(info
->control
.vif
);
1292 switch (sdata
->vif
.type
) {
1293 case NL80211_IFTYPE_MONITOR
:
1294 info
->control
.vif
= NULL
;
1296 case NL80211_IFTYPE_AP_VLAN
:
1297 info
->control
.vif
= &container_of(sdata
->bss
,
1298 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1305 ret
= drv_tx(local
, skb
);
1306 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1310 if (ret
!= NETDEV_TX_OK
) {
1311 info
->control
.vif
= &sdata
->vif
;
1312 return IEEE80211_TX_AGAIN
;
1316 ieee80211_led_tx(local
, 1);
1320 return IEEE80211_TX_OK
;
1324 * Invoke TX handlers, return 0 on success and non-zero if the
1325 * frame was dropped or queued.
1327 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1329 struct sk_buff
*skb
= tx
->skb
;
1330 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1331 ieee80211_tx_result res
= TX_DROP
;
1333 #define CALL_TXH(txh) \
1336 if (res != TX_CONTINUE) \
1340 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1341 CALL_TXH(ieee80211_tx_h_check_assoc
);
1342 CALL_TXH(ieee80211_tx_h_ps_buf
);
1343 CALL_TXH(ieee80211_tx_h_select_key
);
1344 CALL_TXH(ieee80211_tx_h_sta
);
1345 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1346 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1348 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1351 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1352 CALL_TXH(ieee80211_tx_h_sequence
);
1353 CALL_TXH(ieee80211_tx_h_fragment
);
1354 /* handlers after fragment must be aware of tx info fragmentation! */
1355 CALL_TXH(ieee80211_tx_h_stats
);
1356 CALL_TXH(ieee80211_tx_h_encrypt
);
1357 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1361 if (unlikely(res
== TX_DROP
)) {
1362 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1364 struct sk_buff
*next
;
1371 } else if (unlikely(res
== TX_QUEUED
)) {
1372 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1379 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1380 struct sk_buff
*skb
, bool txpending
)
1382 struct ieee80211_local
*local
= sdata
->local
;
1383 struct ieee80211_tx_data tx
;
1384 ieee80211_tx_result res_prepare
;
1385 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1386 struct sk_buff
*next
;
1387 unsigned long flags
;
1391 queue
= skb_get_queue_mapping(skb
);
1393 if (unlikely(skb
->len
< 10)) {
1400 /* initialises tx */
1401 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1403 if (unlikely(res_prepare
== TX_DROP
)) {
1407 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1412 tx
.channel
= local
->hw
.conf
.channel
;
1413 info
->band
= tx
.channel
->band
;
1415 if (invoke_tx_handlers(&tx
))
1420 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1422 case IEEE80211_TX_OK
:
1424 case IEEE80211_TX_AGAIN
:
1426 * Since there are no fragmented frames on A-MPDU
1427 * queues, there's no reason for a driver to reject
1428 * a frame there, warn and drop it.
1430 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1433 case IEEE80211_TX_PENDING
:
1436 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1438 if (local
->queue_stop_reasons
[queue
] ||
1439 !skb_queue_empty(&local
->pending
[queue
])) {
1441 * if queue is stopped, queue up frames for later
1442 * transmission from the tasklet
1447 if (unlikely(txpending
))
1448 __skb_queue_head(&local
->pending
[queue
],
1451 __skb_queue_tail(&local
->pending
[queue
],
1453 } while ((skb
= next
));
1455 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1459 * otherwise retry, but this is a race condition or
1460 * a driver bug (which we warn about if it persists)
1462 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1466 if (WARN(retries
> 10, "tx refused but queue active\n"))
1486 /* device xmit handlers */
1488 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1489 struct sk_buff
*skb
,
1490 int head_need
, bool may_encrypt
)
1495 * This could be optimised, devices that do full hardware
1496 * crypto (including TKIP MMIC) need no tailroom... But we
1497 * have no drivers for such devices currently.
1500 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1501 tail_need
-= skb_tailroom(skb
);
1502 tail_need
= max_t(int, tail_need
, 0);
1505 if (head_need
|| tail_need
) {
1506 /* Sorry. Can't account for this any more */
1510 if (skb_header_cloned(skb
))
1511 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1513 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1515 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1516 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1517 wiphy_name(local
->hw
.wiphy
));
1521 /* update truesize too */
1522 skb
->truesize
+= head_need
+ tail_need
;
1527 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1528 struct sk_buff
*skb
)
1530 struct ieee80211_local
*local
= sdata
->local
;
1531 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1532 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1533 struct ieee80211_sub_if_data
*tmp_sdata
;
1539 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1543 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1544 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1546 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1547 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1548 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1550 /* check the header is complete in the frame */
1551 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1553 * We process outgoing injected frames that have a
1554 * local address we handle as though they are our
1556 * This code here isn't entirely correct, the local
1557 * MAC address is not necessarily enough to find
1558 * the interface to use; for that proper VLAN/WDS
1559 * support we will need a different mechanism.
1562 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1564 if (!ieee80211_sdata_running(tmp_sdata
))
1566 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1568 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1577 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1579 headroom
= local
->tx_headroom
;
1581 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1582 headroom
-= skb_headroom(skb
);
1583 headroom
= max_t(int, 0, headroom
);
1585 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1591 info
->control
.vif
= &sdata
->vif
;
1593 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1594 ieee80211_is_data(hdr
->frame_control
) &&
1595 !is_multicast_ether_addr(hdr
->addr1
))
1596 if (mesh_nexthop_lookup(skb
, sdata
)) {
1597 /* skb queued: don't free */
1602 ieee80211_set_qos_hdr(local
, skb
);
1603 ieee80211_tx(sdata
, skb
, false);
1607 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1608 struct net_device
*dev
)
1610 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1611 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1612 struct ieee80211_radiotap_header
*prthdr
=
1613 (struct ieee80211_radiotap_header
*)skb
->data
;
1614 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1618 * Frame injection is not allowed if beaconing is not allowed
1619 * or if we need radar detection. Beaconing is usually not allowed when
1620 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1621 * Passive scan is also used in world regulatory domains where
1622 * your country is not known and as such it should be treated as
1623 * NO TX unless the channel is explicitly allowed in which case
1624 * your current regulatory domain would not have the passive scan
1627 * Since AP mode uses monitor interfaces to inject/TX management
1628 * frames we can make AP mode the exception to this rule once it
1629 * supports radar detection as its implementation can deal with
1630 * radar detection by itself. We can do that later by adding a
1631 * monitor flag interfaces used for AP support.
1633 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1634 IEEE80211_CHAN_PASSIVE_SCAN
)))
1637 /* check for not even having the fixed radiotap header part */
1638 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1639 goto fail
; /* too short to be possibly valid */
1641 /* is it a header version we can trust to find length from? */
1642 if (unlikely(prthdr
->it_version
))
1643 goto fail
; /* only version 0 is supported */
1645 /* then there must be a radiotap header with a length we can use */
1646 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1648 /* does the skb contain enough to deliver on the alleged length? */
1649 if (unlikely(skb
->len
< len_rthdr
))
1650 goto fail
; /* skb too short for claimed rt header extent */
1653 * fix up the pointers accounting for the radiotap
1654 * header still being in there. We are being given
1655 * a precooked IEEE80211 header so no need for
1658 skb_set_mac_header(skb
, len_rthdr
);
1660 * these are just fixed to the end of the rt area since we
1661 * don't have any better information and at this point, nobody cares
1663 skb_set_network_header(skb
, len_rthdr
);
1664 skb_set_transport_header(skb
, len_rthdr
);
1666 memset(info
, 0, sizeof(*info
));
1668 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1670 /* pass the radiotap header up to xmit */
1671 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1672 return NETDEV_TX_OK
;
1676 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1680 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1681 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1682 * @skb: packet to be sent
1683 * @dev: incoming interface
1685 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1686 * not be freed, and caller is responsible for either retrying later or freeing
1689 * This function takes in an Ethernet header and encapsulates it with suitable
1690 * IEEE 802.11 header based on which interface the packet is coming in. The
1691 * encapsulated packet will then be passed to master interface, wlan#.11, for
1692 * transmission (through low-level driver).
1694 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1695 struct net_device
*dev
)
1697 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1698 struct ieee80211_local
*local
= sdata
->local
;
1699 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1700 int ret
= NETDEV_TX_BUSY
, head_need
;
1701 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1703 struct ieee80211_hdr hdr
;
1704 struct ieee80211s_hdr mesh_hdr
;
1705 const u8
*encaps_data
;
1706 int encaps_len
, skip_header_bytes
;
1708 struct sta_info
*sta
= NULL
;
1711 if (unlikely(skb
->len
< ETH_HLEN
)) {
1716 nh_pos
= skb_network_header(skb
) - skb
->data
;
1717 h_pos
= skb_transport_header(skb
) - skb
->data
;
1719 /* convert Ethernet header to proper 802.11 header (based on
1720 * operation mode) */
1721 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1722 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1724 switch (sdata
->vif
.type
) {
1725 case NL80211_IFTYPE_AP_VLAN
:
1727 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1729 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1731 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1732 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1733 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1734 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1736 sta_flags
= get_sta_flags(sta
);
1742 case NL80211_IFTYPE_AP
:
1743 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1745 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1746 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1747 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1750 case NL80211_IFTYPE_WDS
:
1751 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1753 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1754 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1755 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1756 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1759 #ifdef CONFIG_MAC80211_MESH
1760 case NL80211_IFTYPE_MESH_POINT
:
1761 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1762 /* Do not send frames with mesh_ttl == 0 */
1763 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1768 if (compare_ether_addr(sdata
->vif
.addr
,
1769 skb
->data
+ ETH_ALEN
) == 0) {
1770 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1771 skb
->data
, skb
->data
+ ETH_ALEN
);
1772 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1773 sdata
, NULL
, NULL
, NULL
);
1775 /* packet from other interface */
1776 struct mesh_path
*mppath
;
1777 int is_mesh_mcast
= 1;
1781 if (is_multicast_ether_addr(skb
->data
))
1782 /* DA TA mSA AE:SA */
1783 mesh_da
= skb
->data
;
1785 static const u8 bcast
[ETH_ALEN
] =
1786 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1788 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1790 /* RA TA mDA mSA AE:DA SA */
1791 mesh_da
= mppath
->mpp
;
1794 /* DA TA mSA AE:SA */
1798 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1799 mesh_da
, sdata
->vif
.addr
);
1803 ieee80211_new_mesh_header(&mesh_hdr
,
1805 skb
->data
+ ETH_ALEN
,
1810 ieee80211_new_mesh_header(&mesh_hdr
,
1814 skb
->data
+ ETH_ALEN
);
1819 case NL80211_IFTYPE_STATION
:
1820 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1821 if (sdata
->u
.mgd
.use_4addr
&& ethertype
!= ETH_P_PAE
) {
1822 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1824 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1825 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1826 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1829 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1831 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1832 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1836 case NL80211_IFTYPE_ADHOC
:
1838 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1839 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1840 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1849 * There's no need to try to look up the destination
1850 * if it is a multicast address (which can only happen
1853 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1855 sta
= sta_info_get(sdata
, hdr
.addr1
);
1857 sta_flags
= get_sta_flags(sta
);
1861 /* receiver and we are QoS enabled, use a QoS type frame */
1862 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1863 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1868 * Drop unicast frames to unauthorised stations unless they are
1869 * EAPOL frames from the local station.
1871 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1872 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1873 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1874 !(ethertype
== ETH_P_PAE
&&
1875 compare_ether_addr(sdata
->vif
.addr
,
1876 skb
->data
+ ETH_ALEN
) == 0))) {
1877 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1878 if (net_ratelimit())
1879 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1880 " (unauthorized port)\n", dev
->name
,
1884 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1890 hdr
.frame_control
= fc
;
1891 hdr
.duration_id
= 0;
1894 skip_header_bytes
= ETH_HLEN
;
1895 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1896 encaps_data
= bridge_tunnel_header
;
1897 encaps_len
= sizeof(bridge_tunnel_header
);
1898 skip_header_bytes
-= 2;
1899 } else if (ethertype
>= 0x600) {
1900 encaps_data
= rfc1042_header
;
1901 encaps_len
= sizeof(rfc1042_header
);
1902 skip_header_bytes
-= 2;
1908 skb_pull(skb
, skip_header_bytes
);
1909 nh_pos
-= skip_header_bytes
;
1910 h_pos
-= skip_header_bytes
;
1912 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1915 * So we need to modify the skb header and hence need a copy of
1916 * that. The head_need variable above doesn't, so far, include
1917 * the needed header space that we don't need right away. If we
1918 * can, then we don't reallocate right now but only after the
1919 * frame arrives at the master device (if it does...)
1921 * If we cannot, however, then we will reallocate to include all
1922 * the ever needed space. Also, if we need to reallocate it anyway,
1923 * make it big enough for everything we may ever need.
1926 if (head_need
> 0 || skb_cloned(skb
)) {
1927 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1928 head_need
+= local
->tx_headroom
;
1929 head_need
= max_t(int, 0, head_need
);
1930 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1935 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1936 nh_pos
+= encaps_len
;
1937 h_pos
+= encaps_len
;
1940 if (meshhdrlen
> 0) {
1941 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1942 nh_pos
+= meshhdrlen
;
1943 h_pos
+= meshhdrlen
;
1946 if (ieee80211_is_data_qos(fc
)) {
1947 __le16
*qos_control
;
1949 qos_control
= (__le16
*) skb_push(skb
, 2);
1950 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1952 * Maybe we could actually set some fields here, for now just
1953 * initialise to zero to indicate no special operation.
1957 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1962 dev
->stats
.tx_packets
++;
1963 dev
->stats
.tx_bytes
+= skb
->len
;
1965 /* Update skb pointers to various headers since this modified frame
1966 * is going to go through Linux networking code that may potentially
1967 * need things like pointer to IP header. */
1968 skb_set_mac_header(skb
, 0);
1969 skb_set_network_header(skb
, nh_pos
);
1970 skb_set_transport_header(skb
, h_pos
);
1972 memset(info
, 0, sizeof(*info
));
1974 dev
->trans_start
= jiffies
;
1975 ieee80211_xmit(sdata
, skb
);
1977 return NETDEV_TX_OK
;
1980 if (ret
== NETDEV_TX_OK
)
1988 * ieee80211_clear_tx_pending may not be called in a context where
1989 * it is possible that it packets could come in again.
1991 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1995 for (i
= 0; i
< local
->hw
.queues
; i
++)
1996 skb_queue_purge(&local
->pending
[i
]);
1999 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2000 struct sk_buff
*skb
)
2002 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2003 struct ieee80211_sub_if_data
*sdata
;
2004 struct sta_info
*sta
;
2005 struct ieee80211_hdr
*hdr
;
2009 sdata
= vif_to_sdata(info
->control
.vif
);
2011 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2012 ieee80211_tx(sdata
, skb
, true);
2014 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2015 sta
= sta_info_get(sdata
, hdr
->addr1
);
2017 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
2018 if (ret
!= IEEE80211_TX_OK
)
2026 * Transmit all pending packets. Called from tasklet.
2028 void ieee80211_tx_pending(unsigned long data
)
2030 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2031 struct ieee80211_sub_if_data
*sdata
;
2032 unsigned long flags
;
2038 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2039 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2041 * If queue is stopped by something other than due to pending
2042 * frames, or we have no pending frames, proceed to next queue.
2044 if (local
->queue_stop_reasons
[i
] ||
2045 skb_queue_empty(&local
->pending
[i
]))
2048 while (!skb_queue_empty(&local
->pending
[i
])) {
2049 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2050 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2052 if (WARN_ON(!info
->control
.vif
)) {
2057 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2060 txok
= ieee80211_tx_pending_skb(local
, skb
);
2062 __skb_queue_head(&local
->pending
[i
], skb
);
2063 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2069 if (skb_queue_empty(&local
->pending
[i
]))
2070 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2071 netif_tx_wake_queue(
2072 netdev_get_tx_queue(sdata
->dev
, i
));
2074 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2079 /* functions for drivers to get certain frames */
2081 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2082 struct sk_buff
*skb
,
2083 struct beacon_data
*beacon
)
2087 int i
, have_bits
= 0, n1
, n2
;
2089 /* Generate bitmap for TIM only if there are any STAs in power save
2091 if (atomic_read(&bss
->num_sta_ps
) > 0)
2092 /* in the hope that this is faster than
2093 * checking byte-for-byte */
2094 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2095 IEEE80211_MAX_AID
+1);
2097 if (bss
->dtim_count
== 0)
2098 bss
->dtim_count
= beacon
->dtim_period
- 1;
2102 tim
= pos
= (u8
*) skb_put(skb
, 6);
2103 *pos
++ = WLAN_EID_TIM
;
2105 *pos
++ = bss
->dtim_count
;
2106 *pos
++ = beacon
->dtim_period
;
2108 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2112 /* Find largest even number N1 so that bits numbered 1 through
2113 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2114 * (N2 + 1) x 8 through 2007 are 0. */
2116 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2123 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2130 /* Bitmap control */
2132 /* Part Virt Bitmap */
2133 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2135 tim
[1] = n2
- n1
+ 4;
2136 skb_put(skb
, n2
- n1
);
2138 *pos
++ = aid0
; /* Bitmap control */
2139 *pos
++ = 0; /* Part Virt Bitmap */
2143 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2144 struct ieee80211_vif
*vif
,
2145 u16
*tim_offset
, u16
*tim_length
)
2147 struct ieee80211_local
*local
= hw_to_local(hw
);
2148 struct sk_buff
*skb
= NULL
;
2149 struct ieee80211_tx_info
*info
;
2150 struct ieee80211_sub_if_data
*sdata
= NULL
;
2151 struct ieee80211_if_ap
*ap
= NULL
;
2152 struct beacon_data
*beacon
;
2153 struct ieee80211_supported_band
*sband
;
2154 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2155 struct ieee80211_tx_rate_control txrc
;
2157 sband
= local
->hw
.wiphy
->bands
[band
];
2161 sdata
= vif_to_sdata(vif
);
2168 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2170 beacon
= rcu_dereference(ap
->beacon
);
2173 * headroom, head length,
2174 * tail length and maximum TIM length
2176 skb
= dev_alloc_skb(local
->tx_headroom
+
2178 beacon
->tail_len
+ 256);
2182 skb_reserve(skb
, local
->tx_headroom
);
2183 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2187 * Not very nice, but we want to allow the driver to call
2188 * ieee80211_beacon_get() as a response to the set_tim()
2189 * callback. That, however, is already invoked under the
2190 * sta_lock to guarantee consistent and race-free update
2191 * of the tim bitmap in mac80211 and the driver.
2193 if (local
->tim_in_locked_section
) {
2194 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2196 unsigned long flags
;
2198 spin_lock_irqsave(&local
->sta_lock
, flags
);
2199 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2200 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2204 *tim_offset
= beacon
->head_len
;
2206 *tim_length
= skb
->len
- beacon
->head_len
;
2209 memcpy(skb_put(skb
, beacon
->tail_len
),
2210 beacon
->tail
, beacon
->tail_len
);
2213 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2214 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2215 struct ieee80211_hdr
*hdr
;
2216 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2221 skb
= skb_copy(presp
, GFP_ATOMIC
);
2225 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2226 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2227 IEEE80211_STYPE_BEACON
);
2228 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2229 struct ieee80211_mgmt
*mgmt
;
2232 /* headroom, head length, tail length and maximum TIM length */
2233 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2237 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2238 mgmt
= (struct ieee80211_mgmt
*)
2239 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2240 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2241 mgmt
->frame_control
=
2242 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2243 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2244 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2245 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2246 mgmt
->u
.beacon
.beacon_int
=
2247 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2248 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2250 pos
= skb_put(skb
, 2);
2251 *pos
++ = WLAN_EID_SSID
;
2254 mesh_mgmt_ies_add(skb
, sdata
);
2260 info
= IEEE80211_SKB_CB(skb
);
2262 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2263 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2266 memset(&txrc
, 0, sizeof(txrc
));
2269 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2271 txrc
.reported_rate
.idx
= -1;
2272 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2273 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2274 txrc
.max_rate_idx
= -1;
2276 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2278 rate_control_get_rate(sdata
, NULL
, &txrc
);
2280 info
->control
.vif
= vif
;
2282 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2283 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2284 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2289 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2291 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2292 struct ieee80211_vif
*vif
)
2294 struct ieee80211_sub_if_data
*sdata
;
2295 struct ieee80211_if_managed
*ifmgd
;
2296 struct ieee80211_pspoll
*pspoll
;
2297 struct ieee80211_local
*local
;
2298 struct sk_buff
*skb
;
2300 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2303 sdata
= vif_to_sdata(vif
);
2304 ifmgd
= &sdata
->u
.mgd
;
2305 local
= sdata
->local
;
2307 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2309 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2310 "pspoll template\n", sdata
->name
);
2313 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2315 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2316 memset(pspoll
, 0, sizeof(*pspoll
));
2317 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2318 IEEE80211_STYPE_PSPOLL
);
2319 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2321 /* aid in PS-Poll has its two MSBs each set to 1 */
2322 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2324 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2325 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2329 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2331 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2332 struct ieee80211_vif
*vif
)
2334 struct ieee80211_hdr_3addr
*nullfunc
;
2335 struct ieee80211_sub_if_data
*sdata
;
2336 struct ieee80211_if_managed
*ifmgd
;
2337 struct ieee80211_local
*local
;
2338 struct sk_buff
*skb
;
2340 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2343 sdata
= vif_to_sdata(vif
);
2344 ifmgd
= &sdata
->u
.mgd
;
2345 local
= sdata
->local
;
2347 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2349 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2350 "template\n", sdata
->name
);
2353 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2355 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2357 memset(nullfunc
, 0, sizeof(*nullfunc
));
2358 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2359 IEEE80211_STYPE_NULLFUNC
|
2360 IEEE80211_FCTL_TODS
);
2361 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2362 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2363 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2367 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2369 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2370 struct ieee80211_vif
*vif
,
2371 const u8
*ssid
, size_t ssid_len
,
2372 const u8
*ie
, size_t ie_len
)
2374 struct ieee80211_sub_if_data
*sdata
;
2375 struct ieee80211_local
*local
;
2376 struct ieee80211_hdr_3addr
*hdr
;
2377 struct sk_buff
*skb
;
2381 sdata
= vif_to_sdata(vif
);
2382 local
= sdata
->local
;
2383 ie_ssid_len
= 2 + ssid_len
;
2385 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2386 ie_ssid_len
+ ie_len
);
2388 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2389 "request template\n", sdata
->name
);
2393 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2395 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2396 memset(hdr
, 0, sizeof(*hdr
));
2397 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2398 IEEE80211_STYPE_PROBE_REQ
);
2399 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2400 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2401 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2403 pos
= skb_put(skb
, ie_ssid_len
);
2404 *pos
++ = WLAN_EID_SSID
;
2407 memcpy(pos
, ssid
, ssid_len
);
2411 pos
= skb_put(skb
, ie_len
);
2412 memcpy(pos
, ie
, ie_len
);
2417 EXPORT_SYMBOL(ieee80211_probereq_get
);
2419 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2420 const void *frame
, size_t frame_len
,
2421 const struct ieee80211_tx_info
*frame_txctl
,
2422 struct ieee80211_rts
*rts
)
2424 const struct ieee80211_hdr
*hdr
= frame
;
2426 rts
->frame_control
=
2427 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2428 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2430 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2431 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2433 EXPORT_SYMBOL(ieee80211_rts_get
);
2435 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2436 const void *frame
, size_t frame_len
,
2437 const struct ieee80211_tx_info
*frame_txctl
,
2438 struct ieee80211_cts
*cts
)
2440 const struct ieee80211_hdr
*hdr
= frame
;
2442 cts
->frame_control
=
2443 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2444 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2445 frame_len
, frame_txctl
);
2446 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2448 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2451 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2452 struct ieee80211_vif
*vif
)
2454 struct ieee80211_local
*local
= hw_to_local(hw
);
2455 struct sk_buff
*skb
= NULL
;
2456 struct sta_info
*sta
;
2457 struct ieee80211_tx_data tx
;
2458 struct ieee80211_sub_if_data
*sdata
;
2459 struct ieee80211_if_ap
*bss
= NULL
;
2460 struct beacon_data
*beacon
;
2461 struct ieee80211_tx_info
*info
;
2463 sdata
= vif_to_sdata(vif
);
2467 beacon
= rcu_dereference(bss
->beacon
);
2469 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2472 if (bss
->dtim_count
!= 0)
2473 goto out
; /* send buffered bc/mc only after DTIM beacon */
2476 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2479 local
->total_ps_buffered
--;
2481 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2482 struct ieee80211_hdr
*hdr
=
2483 (struct ieee80211_hdr
*) skb
->data
;
2484 /* more buffered multicast/broadcast frames ==> set
2485 * MoreData flag in IEEE 802.11 header to inform PS
2487 hdr
->frame_control
|=
2488 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2491 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2493 dev_kfree_skb_any(skb
);
2496 info
= IEEE80211_SKB_CB(skb
);
2499 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2500 tx
.channel
= local
->hw
.conf
.channel
;
2501 info
->band
= tx
.channel
->band
;
2503 if (invoke_tx_handlers(&tx
))
2510 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2512 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2514 skb_set_mac_header(skb
, 0);
2515 skb_set_network_header(skb
, 0);
2516 skb_set_transport_header(skb
, 0);
2518 /* send all internal mgmt frames on VO */
2519 skb_set_queue_mapping(skb
, 0);
2522 * The other path calling ieee80211_xmit is from the tasklet,
2523 * and while we can handle concurrent transmissions locking
2524 * requirements are that we do not come into tx with bhs on.
2527 ieee80211_xmit(sdata
, skb
);