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 <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
40 struct sk_buff
*skb
, int group_addr
,
43 int rate
, mrate
, erp
, dur
, i
;
44 struct ieee80211_rate
*txrate
;
45 struct ieee80211_local
*local
= tx
->local
;
46 struct ieee80211_supported_band
*sband
;
47 struct ieee80211_hdr
*hdr
;
48 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 /* assume HW handles this */
51 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
55 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
58 sband
= local
->hw
.wiphy
->bands
[info
->band
];
59 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
61 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr
= (struct ieee80211_hdr
*)skb
->data
;
81 if (ieee80211_is_ctl(hdr
->frame_control
)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr
) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate
= sband
->bitrates
[0].bitrate
;
119 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
120 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
122 if (r
->bitrate
> txrate
->bitrate
)
125 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
128 switch (sband
->band
) {
129 case IEEE80211_BAND_2GHZ
: {
131 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
132 flag
= IEEE80211_RATE_MANDATORY_G
;
134 flag
= IEEE80211_RATE_MANDATORY_B
;
139 case IEEE80211_BAND_5GHZ
:
140 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
143 case IEEE80211_BAND_60GHZ
:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
158 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
165 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur
*= 2; /* ACK + SIFS */
172 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
173 txrate
->bitrate
, erp
,
174 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
177 return cpu_to_le16(dur
);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
184 struct ieee80211_local
*local
= tx
->local
;
185 struct ieee80211_if_managed
*ifmgd
;
187 /* driver doesn't support power save */
188 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
191 /* hardware does dynamic power save */
192 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
195 /* dynamic power save disabled */
196 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
199 /* we are scanning, don't enable power save */
203 if (!local
->ps_sdata
)
206 /* No point if we're going to suspend */
207 if (local
->quiescing
)
210 /* dynamic ps is supported only in managed mode */
211 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
214 ifmgd
= &tx
->sdata
->u
.mgd
;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
230 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
231 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
234 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
235 ieee80211_stop_queues_by_reason(&local
->hw
,
236 IEEE80211_QUEUE_STOP_REASON_PS
);
237 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
238 ieee80211_queue_work(&local
->hw
,
239 &local
->dynamic_ps_disable_work
);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd
->associated
)
246 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
247 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
256 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
257 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
260 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
263 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
265 !ieee80211_is_probe_req(hdr
->frame_control
) &&
266 !ieee80211_is_nullfunc(hdr
->frame_control
))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
283 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
286 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
290 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
292 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
293 if (unlikely(!assoc
&&
294 ieee80211_is_data(hdr
->frame_control
))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx
->sdata
,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
303 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
304 ieee80211_is_data(hdr
->frame_control
) &&
305 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
307 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
322 int total
= 0, purged
= 0;
324 struct ieee80211_sub_if_data
*sdata
;
325 struct sta_info
*sta
;
327 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
330 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
331 ps
= &sdata
->u
.ap
.ps
;
335 skb
= skb_dequeue(&ps
->bc_buf
);
340 total
+= skb_queue_len(&ps
->bc_buf
);
344 * Drop one frame from each station from the lowest-priority
345 * AC that has frames at all.
347 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
350 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
351 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
352 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
355 ieee80211_free_txskb(&local
->hw
, skb
);
361 local
->total_ps_buffered
= total
;
362 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
365 static ieee80211_tx_result
366 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
368 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
369 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
373 * broadcast/multicast frame
375 * If any of the associated stations is in power save mode,
376 * the frame is buffered to be sent after DTIM beacon frame.
377 * This is done either by the hardware or us.
380 /* powersaving STAs currently only in AP/VLAN mode */
381 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
382 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
386 ps
= &tx
->sdata
->bss
->ps
;
392 /* no buffering for ordered frames */
393 if (ieee80211_has_order(hdr
->frame_control
))
396 /* no stations in PS mode */
397 if (!atomic_read(&ps
->num_sta_ps
))
400 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
401 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
402 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
404 /* device releases frame after DTIM beacon */
405 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
408 /* buffered in mac80211 */
409 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
410 purge_old_ps_buffers(tx
->local
);
412 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
414 "BC TX buffer full - dropping the oldest frame\n");
415 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
417 tx
->local
->total_ps_buffered
++;
419 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
424 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
427 if (!ieee80211_is_mgmt(fc
))
430 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
433 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
440 static ieee80211_tx_result
441 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
443 struct sta_info
*sta
= tx
->sta
;
444 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
445 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
446 struct ieee80211_local
*local
= tx
->local
;
451 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
452 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
453 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
454 int ac
= skb_get_queue_mapping(tx
->skb
);
456 /* only deauth, disassoc and action are bufferable MMPDUs */
457 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
458 !ieee80211_is_deauth(hdr
->frame_control
) &&
459 !ieee80211_is_disassoc(hdr
->frame_control
) &&
460 !ieee80211_is_action(hdr
->frame_control
)) {
461 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
465 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
466 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
467 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
468 purge_old_ps_buffers(tx
->local
);
469 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
470 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
472 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
474 ieee80211_free_txskb(&local
->hw
, old
);
476 tx
->local
->total_ps_buffered
++;
478 info
->control
.jiffies
= jiffies
;
479 info
->control
.vif
= &tx
->sdata
->vif
;
480 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
481 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
483 if (!timer_pending(&local
->sta_cleanup
))
484 mod_timer(&local
->sta_cleanup
,
485 round_jiffies(jiffies
+
486 STA_INFO_CLEANUP_INTERVAL
));
489 * We queued up some frames, so the TIM bit might
490 * need to be set, recalculate it.
492 sta_info_recalc_tim(sta
);
495 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
497 "STA %pM in PS mode, but polling/in SP -> send frame\n",
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
507 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
510 if (tx
->flags
& IEEE80211_TX_UNICAST
)
511 return ieee80211_tx_h_unicast_ps_buf(tx
);
513 return ieee80211_tx_h_multicast_ps_buf(tx
);
516 static ieee80211_tx_result debug_noinline
517 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
519 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
521 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
522 tx
->sdata
->control_port_no_encrypt
))
523 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
528 static ieee80211_tx_result debug_noinline
529 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
531 struct ieee80211_key
*key
;
532 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
533 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
535 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
537 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
539 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
540 is_multicast_ether_addr(hdr
->addr1
) &&
541 ieee80211_is_robust_mgmt_frame(hdr
) &&
542 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
544 else if (is_multicast_ether_addr(hdr
->addr1
) &&
545 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
547 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
548 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
550 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
552 else if (!tx
->sdata
->drop_unencrypted
)
554 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
556 else if (ieee80211_is_robust_mgmt_frame(hdr
) &&
557 !(ieee80211_is_action(hdr
->frame_control
) &&
558 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
560 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
561 !ieee80211_is_robust_mgmt_frame(hdr
))
564 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
569 bool skip_hw
= false;
571 tx
->key
->tx_rx_count
++;
572 /* TODO: add threshold stuff again */
574 switch (tx
->key
->conf
.cipher
) {
575 case WLAN_CIPHER_SUITE_WEP40
:
576 case WLAN_CIPHER_SUITE_WEP104
:
577 case WLAN_CIPHER_SUITE_TKIP
:
578 if (!ieee80211_is_data_present(hdr
->frame_control
))
581 case WLAN_CIPHER_SUITE_CCMP
:
582 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
583 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
587 skip_hw
= (tx
->key
->conf
.flags
&
588 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
589 ieee80211_is_mgmt(hdr
->frame_control
);
591 case WLAN_CIPHER_SUITE_AES_CMAC
:
592 if (!ieee80211_is_mgmt(hdr
->frame_control
))
597 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
600 if (!skip_hw
&& tx
->key
&&
601 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
602 info
->control
.hw_key
= &tx
->key
->conf
;
608 static ieee80211_tx_result debug_noinline
609 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
611 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
612 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
613 struct ieee80211_supported_band
*sband
;
614 struct ieee80211_rate
*rate
;
617 bool inval
= false, rts
= false, short_preamble
= false;
618 struct ieee80211_tx_rate_control txrc
;
621 memset(&txrc
, 0, sizeof(txrc
));
623 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
625 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
626 tx
->local
->hw
.wiphy
->frag_threshold
);
628 /* set up the tx rate control struct we give the RC algo */
629 txrc
.hw
= &tx
->local
->hw
;
631 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
633 txrc
.reported_rate
.idx
= -1;
634 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
635 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
636 txrc
.max_rate_idx
= -1;
638 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
639 memcpy(txrc
.rate_idx_mcs_mask
,
640 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
],
641 sizeof(txrc
.rate_idx_mcs_mask
));
642 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
643 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
644 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
646 /* set up RTS protection if desired */
647 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
648 txrc
.rts
= rts
= true;
652 * Use short preamble if the BSS can handle it, but not for
653 * management frames unless we know the receiver can handle
654 * that -- the management frame might be to a station that
655 * just wants a probe response.
657 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
658 (ieee80211_is_data(hdr
->frame_control
) ||
659 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
660 txrc
.short_preamble
= short_preamble
= true;
663 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
666 * Lets not bother rate control if we're associated and cannot
667 * talk to the sta. This should not happen.
669 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
670 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
671 "%s: Dropped data frame as no usable bitrate found while "
672 "scanning and associated. Target station: "
673 "%pM on %d GHz band\n",
674 tx
->sdata
->name
, hdr
->addr1
,
679 * If we're associated with the sta at this point we know we can at
680 * least send the frame at the lowest bit rate.
682 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
684 if (unlikely(info
->control
.rates
[0].idx
< 0))
687 if (txrc
.reported_rate
.idx
< 0) {
688 txrc
.reported_rate
= info
->control
.rates
[0];
689 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
690 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
692 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
694 if (unlikely(!info
->control
.rates
[0].count
))
695 info
->control
.rates
[0].count
= 1;
697 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
698 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
699 info
->control
.rates
[0].count
= 1;
701 if (is_multicast_ether_addr(hdr
->addr1
)) {
703 * XXX: verify the rate is in the basic rateset
709 * set up the RTS/CTS rate as the fastest basic rate
710 * that is not faster than the data rate
712 * XXX: Should this check all retry rates?
714 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
717 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
719 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
720 /* must be a basic rate */
721 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
723 /* must not be faster than the data rate */
724 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
727 if (sband
->bitrates
[baserate
].bitrate
<
728 sband
->bitrates
[i
].bitrate
)
732 info
->control
.rts_cts_rate_idx
= baserate
;
735 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
737 * make sure there's no valid rate following
738 * an invalid one, just in case drivers don't
739 * take the API seriously to stop at -1.
742 info
->control
.rates
[i
].idx
= -1;
745 if (info
->control
.rates
[i
].idx
< 0) {
751 * For now assume MCS is already set up correctly, this
754 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
755 WARN_ON(info
->control
.rates
[i
].idx
> 76);
759 /* set up RTS protection if desired */
761 info
->control
.rates
[i
].flags
|=
762 IEEE80211_TX_RC_USE_RTS_CTS
;
765 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
766 sband
->n_bitrates
)) {
767 info
->control
.rates
[i
].idx
= -1;
771 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
773 /* set up short preamble */
774 if (short_preamble
&&
775 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
776 info
->control
.rates
[i
].flags
|=
777 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
779 /* set up G protection */
780 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
781 rate
->flags
& IEEE80211_RATE_ERP_G
)
782 info
->control
.rates
[i
].flags
|=
783 IEEE80211_TX_RC_USE_CTS_PROTECT
;
789 static ieee80211_tx_result debug_noinline
790 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
792 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
793 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
799 * Packet injection may want to control the sequence
800 * number, if we have no matching interface then we
801 * neither assign one ourselves nor ask the driver to.
803 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
806 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
809 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
812 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
816 * Anything but QoS data that has a sequence number field
817 * (is long enough) gets a sequence number from the global
820 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
821 /* driver should assign sequence number */
822 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
823 /* for pure STA mode without beacons, we can do it */
824 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
825 tx
->sdata
->sequence_number
+= 0x10;
830 * This should be true for injected/management frames only, for
831 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
832 * above since they are not QoS-data frames.
837 /* include per-STA, per-TID sequence counter */
839 qc
= ieee80211_get_qos_ctl(hdr
);
840 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
841 seq
= &tx
->sta
->tid_seq
[tid
];
843 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
845 /* Increase the sequence number. */
846 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
851 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
852 struct sk_buff
*skb
, int hdrlen
,
855 struct ieee80211_local
*local
= tx
->local
;
856 struct ieee80211_tx_info
*info
;
858 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
859 int pos
= hdrlen
+ per_fragm
;
860 int rem
= skb
->len
- hdrlen
- per_fragm
;
862 if (WARN_ON(rem
< 0))
865 /* first fragment was already added to queue by caller */
868 int fraglen
= per_fragm
;
873 tmp
= dev_alloc_skb(local
->tx_headroom
+
875 IEEE80211_ENCRYPT_HEADROOM
+
876 IEEE80211_ENCRYPT_TAILROOM
);
880 __skb_queue_tail(&tx
->skbs
, tmp
);
882 skb_reserve(tmp
, local
->tx_headroom
+
883 IEEE80211_ENCRYPT_HEADROOM
);
884 /* copy control information */
885 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
887 info
= IEEE80211_SKB_CB(tmp
);
888 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
889 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
892 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
894 skb_copy_queue_mapping(tmp
, skb
);
895 tmp
->priority
= skb
->priority
;
898 /* copy header and data */
899 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
900 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
905 /* adjust first fragment's length */
906 skb
->len
= hdrlen
+ per_fragm
;
910 static ieee80211_tx_result debug_noinline
911 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
913 struct sk_buff
*skb
= tx
->skb
;
914 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
915 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
916 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
920 /* no matter what happens, tx->skb moves to tx->skbs */
921 __skb_queue_tail(&tx
->skbs
, skb
);
924 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
927 if (tx
->local
->ops
->set_frag_threshold
)
931 * Warn when submitting a fragmented A-MPDU frame and drop it.
932 * This scenario is handled in ieee80211_tx_prepare but extra
933 * caution taken here as fragmented ampdu may cause Tx stop.
935 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
938 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
940 /* internal error, why isn't DONTFRAG set? */
941 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
945 * Now fragment the frame. This will allocate all the fragments and
946 * chain them (using skb as the first fragment) to skb->next.
947 * During transmission, we will remove the successfully transmitted
948 * fragments from this list. When the low-level driver rejects one
949 * of the fragments then we will simply pretend to accept the skb
950 * but store it away as pending.
952 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
955 /* update duration/seq/flags of fragments */
958 skb_queue_walk(&tx
->skbs
, skb
) {
959 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
961 hdr
= (void *)skb
->data
;
962 info
= IEEE80211_SKB_CB(skb
);
964 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
965 hdr
->frame_control
|= morefrags
;
967 * No multi-rate retries for fragmented frames, that
968 * would completely throw off the NAV at other STAs.
970 info
->control
.rates
[1].idx
= -1;
971 info
->control
.rates
[2].idx
= -1;
972 info
->control
.rates
[3].idx
= -1;
973 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
974 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
976 hdr
->frame_control
&= ~morefrags
;
978 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
985 static ieee80211_tx_result debug_noinline
986 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
993 tx
->sta
->tx_packets
++;
994 skb_queue_walk(&tx
->skbs
, skb
) {
995 tx
->sta
->tx_fragments
++;
996 tx
->sta
->tx_bytes
+= skb
->len
;
1002 static ieee80211_tx_result debug_noinline
1003 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1008 switch (tx
->key
->conf
.cipher
) {
1009 case WLAN_CIPHER_SUITE_WEP40
:
1010 case WLAN_CIPHER_SUITE_WEP104
:
1011 return ieee80211_crypto_wep_encrypt(tx
);
1012 case WLAN_CIPHER_SUITE_TKIP
:
1013 return ieee80211_crypto_tkip_encrypt(tx
);
1014 case WLAN_CIPHER_SUITE_CCMP
:
1015 return ieee80211_crypto_ccmp_encrypt(tx
);
1016 case WLAN_CIPHER_SUITE_AES_CMAC
:
1017 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1019 return ieee80211_crypto_hw_encrypt(tx
);
1025 static ieee80211_tx_result debug_noinline
1026 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1028 struct sk_buff
*skb
;
1029 struct ieee80211_hdr
*hdr
;
1033 skb_queue_walk(&tx
->skbs
, skb
) {
1034 hdr
= (void *) skb
->data
;
1035 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1036 break; /* must not overwrite AID */
1037 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1038 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1039 next_len
= next
->len
;
1042 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1045 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1051 /* actual transmit path */
1053 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1054 struct sk_buff
*skb
,
1055 struct ieee80211_tx_info
*info
,
1056 struct tid_ampdu_tx
*tid_tx
,
1059 bool queued
= false;
1060 bool reset_agg_timer
= false;
1061 struct sk_buff
*purge_skb
= NULL
;
1063 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1064 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1065 reset_agg_timer
= true;
1066 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1068 * nothing -- this aggregation session is being started
1069 * but that might still fail with the driver
1072 spin_lock(&tx
->sta
->lock
);
1074 * Need to re-check now, because we may get here
1076 * 1) in the window during which the setup is actually
1077 * already done, but not marked yet because not all
1078 * packets are spliced over to the driver pending
1079 * queue yet -- if this happened we acquire the lock
1080 * either before or after the splice happens, but
1081 * need to recheck which of these cases happened.
1083 * 2) during session teardown, if the OPERATIONAL bit
1084 * was cleared due to the teardown but the pointer
1085 * hasn't been assigned NULL yet (or we loaded it
1086 * before it was assigned) -- in this case it may
1087 * now be NULL which means we should just let the
1088 * packet pass through because splicing the frames
1089 * back is already done.
1091 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1094 /* do nothing, let packet pass through */
1095 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1096 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1097 reset_agg_timer
= true;
1100 info
->control
.vif
= &tx
->sdata
->vif
;
1101 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1102 __skb_queue_tail(&tid_tx
->pending
, skb
);
1103 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1104 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1106 spin_unlock(&tx
->sta
->lock
);
1109 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1112 /* reset session timer */
1113 if (reset_agg_timer
&& tid_tx
->timeout
)
1114 tid_tx
->last_tx
= jiffies
;
1122 static ieee80211_tx_result
1123 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1124 struct ieee80211_tx_data
*tx
,
1125 struct sk_buff
*skb
)
1127 struct ieee80211_local
*local
= sdata
->local
;
1128 struct ieee80211_hdr
*hdr
;
1129 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1133 memset(tx
, 0, sizeof(*tx
));
1137 __skb_queue_head_init(&tx
->skbs
);
1140 * If this flag is set to true anywhere, and we get here,
1141 * we are doing the needed processing, so remove the flag
1144 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1146 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1148 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1149 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1150 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1152 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1153 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1154 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1157 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1159 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1160 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1161 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1162 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1163 struct tid_ampdu_tx
*tid_tx
;
1165 qc
= ieee80211_get_qos_ctl(hdr
);
1166 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1168 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1172 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1175 if (unlikely(queued
))
1180 if (is_multicast_ether_addr(hdr
->addr1
)) {
1181 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1182 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1184 tx
->flags
|= IEEE80211_TX_UNICAST
;
1186 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1187 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1188 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1189 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1190 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1194 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1195 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1196 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1198 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1203 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1204 struct ieee80211_vif
*vif
,
1205 struct ieee80211_sta
*sta
,
1206 struct sk_buff_head
*skbs
,
1209 struct ieee80211_tx_control control
;
1210 struct sk_buff
*skb
, *tmp
;
1211 unsigned long flags
;
1213 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1214 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1215 int q
= info
->hw_queue
;
1217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1218 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1219 __skb_unlink(skb
, skbs
);
1220 ieee80211_free_txskb(&local
->hw
, skb
);
1225 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1226 if (local
->queue_stop_reasons
[q
] ||
1227 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1229 * Since queue is stopped, queue up frames for later
1230 * transmission from the tx-pending tasklet when the
1231 * queue is woken again.
1234 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1236 skb_queue_splice_tail_init(skbs
,
1237 &local
->pending
[q
]);
1239 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1243 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1245 info
->control
.vif
= vif
;
1248 __skb_unlink(skb
, skbs
);
1249 drv_tx(local
, &control
, skb
);
1256 * Returns false if the frame couldn't be transmitted but was queued instead.
1258 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1259 struct sk_buff_head
*skbs
, int led_len
,
1260 struct sta_info
*sta
, bool txpending
)
1262 struct ieee80211_tx_info
*info
;
1263 struct ieee80211_sub_if_data
*sdata
;
1264 struct ieee80211_vif
*vif
;
1265 struct ieee80211_sta
*pubsta
;
1266 struct sk_buff
*skb
;
1270 if (WARN_ON(skb_queue_empty(skbs
)))
1273 skb
= skb_peek(skbs
);
1274 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1275 info
= IEEE80211_SKB_CB(skb
);
1276 sdata
= vif_to_sdata(info
->control
.vif
);
1277 if (sta
&& !sta
->uploaded
)
1285 switch (sdata
->vif
.type
) {
1286 case NL80211_IFTYPE_MONITOR
:
1287 sdata
= rcu_dereference(local
->monitor_sdata
);
1291 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1292 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1298 case NL80211_IFTYPE_AP_VLAN
:
1299 sdata
= container_of(sdata
->bss
,
1300 struct ieee80211_sub_if_data
, u
.ap
);
1307 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1310 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1311 ieee80211_led_tx(local
, 1);
1313 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1319 * Invoke TX handlers, return 0 on success and non-zero if the
1320 * frame was dropped or queued.
1322 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1324 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1325 ieee80211_tx_result res
= TX_DROP
;
1327 #define CALL_TXH(txh) \
1330 if (res != TX_CONTINUE) \
1334 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1335 CALL_TXH(ieee80211_tx_h_check_assoc
);
1336 CALL_TXH(ieee80211_tx_h_ps_buf
);
1337 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1338 CALL_TXH(ieee80211_tx_h_select_key
);
1339 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1340 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1342 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1343 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1348 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1349 CALL_TXH(ieee80211_tx_h_sequence
);
1350 CALL_TXH(ieee80211_tx_h_fragment
);
1351 /* handlers after fragment must be aware of tx info fragmentation! */
1352 CALL_TXH(ieee80211_tx_h_stats
);
1353 CALL_TXH(ieee80211_tx_h_encrypt
);
1354 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1355 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1359 if (unlikely(res
== TX_DROP
)) {
1360 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1362 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1364 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1366 } else if (unlikely(res
== TX_QUEUED
)) {
1367 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1375 * Returns false if the frame couldn't be transmitted but was queued instead.
1377 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1378 struct sk_buff
*skb
, bool txpending
,
1379 enum ieee80211_band band
)
1381 struct ieee80211_local
*local
= sdata
->local
;
1382 struct ieee80211_tx_data tx
;
1383 ieee80211_tx_result res_prepare
;
1384 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1388 if (unlikely(skb
->len
< 10)) {
1393 /* initialises tx */
1395 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1397 if (unlikely(res_prepare
== TX_DROP
)) {
1398 ieee80211_free_txskb(&local
->hw
, skb
);
1400 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1406 /* set up hw_queue value early */
1407 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1408 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1410 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1412 if (!invoke_tx_handlers(&tx
))
1413 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1419 /* device xmit handlers */
1421 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1422 struct sk_buff
*skb
,
1423 int head_need
, bool may_encrypt
)
1425 struct ieee80211_local
*local
= sdata
->local
;
1428 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1429 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1430 tail_need
-= skb_tailroom(skb
);
1431 tail_need
= max_t(int, tail_need
, 0);
1434 if (skb_cloned(skb
))
1435 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1436 else if (head_need
|| tail_need
)
1437 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1441 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1442 wiphy_debug(local
->hw
.wiphy
,
1443 "failed to reallocate TX buffer\n");
1450 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
1451 enum ieee80211_band band
)
1453 struct ieee80211_local
*local
= sdata
->local
;
1454 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1455 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1459 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1461 headroom
= local
->tx_headroom
;
1463 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1464 headroom
-= skb_headroom(skb
);
1465 headroom
= max_t(int, 0, headroom
);
1467 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1468 ieee80211_free_txskb(&local
->hw
, skb
);
1472 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1473 info
->control
.vif
= &sdata
->vif
;
1475 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1476 ieee80211_is_data(hdr
->frame_control
) &&
1477 !is_multicast_ether_addr(hdr
->addr1
) &&
1478 mesh_nexthop_resolve(skb
, sdata
)) {
1479 /* skb queued: don't free */
1483 ieee80211_set_qos_hdr(sdata
, skb
);
1484 ieee80211_tx(sdata
, skb
, false, band
);
1487 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1489 struct ieee80211_radiotap_iterator iterator
;
1490 struct ieee80211_radiotap_header
*rthdr
=
1491 (struct ieee80211_radiotap_header
*) skb
->data
;
1492 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1493 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1497 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1498 IEEE80211_TX_CTL_DONTFRAG
;
1501 * for every radiotap entry that is present
1502 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1503 * entries present, or -EINVAL on error)
1507 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1512 /* see if this argument is something we can use */
1513 switch (iterator
.this_arg_index
) {
1515 * You must take care when dereferencing iterator.this_arg
1516 * for multibyte types... the pointer is not aligned. Use
1517 * get_unaligned((type *)iterator.this_arg) to dereference
1518 * iterator.this_arg for type "type" safely on all arches.
1520 case IEEE80211_RADIOTAP_FLAGS
:
1521 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1523 * this indicates that the skb we have been
1524 * handed has the 32-bit FCS CRC at the end...
1525 * we should react to that by snipping it off
1526 * because it will be recomputed and added
1529 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1532 skb_trim(skb
, skb
->len
- FCS_LEN
);
1534 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1535 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1536 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1537 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1540 case IEEE80211_RADIOTAP_TX_FLAGS
:
1541 txflags
= get_unaligned_le16(iterator
.this_arg
);
1542 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1543 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1547 * Please update the file
1548 * Documentation/networking/mac80211-injection.txt
1549 * when parsing new fields here.
1557 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1561 * remove the radiotap header
1562 * iterator->_max_length was sanity-checked against
1563 * skb->len by iterator init
1565 skb_pull(skb
, iterator
._max_length
);
1570 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1571 struct net_device
*dev
)
1573 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1574 struct ieee80211_chanctx_conf
*chanctx_conf
;
1575 struct ieee80211_channel
*chan
;
1576 struct ieee80211_radiotap_header
*prthdr
=
1577 (struct ieee80211_radiotap_header
*)skb
->data
;
1578 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1579 struct ieee80211_hdr
*hdr
;
1580 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1584 /* check for not even having the fixed radiotap header part */
1585 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1586 goto fail
; /* too short to be possibly valid */
1588 /* is it a header version we can trust to find length from? */
1589 if (unlikely(prthdr
->it_version
))
1590 goto fail
; /* only version 0 is supported */
1592 /* then there must be a radiotap header with a length we can use */
1593 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1595 /* does the skb contain enough to deliver on the alleged length? */
1596 if (unlikely(skb
->len
< len_rthdr
))
1597 goto fail
; /* skb too short for claimed rt header extent */
1600 * fix up the pointers accounting for the radiotap
1601 * header still being in there. We are being given
1602 * a precooked IEEE80211 header so no need for
1605 skb_set_mac_header(skb
, len_rthdr
);
1607 * these are just fixed to the end of the rt area since we
1608 * don't have any better information and at this point, nobody cares
1610 skb_set_network_header(skb
, len_rthdr
);
1611 skb_set_transport_header(skb
, len_rthdr
);
1613 if (skb
->len
< len_rthdr
+ 2)
1616 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1617 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1619 if (skb
->len
< len_rthdr
+ hdrlen
)
1623 * Initialize skb->protocol if the injected frame is a data frame
1624 * carrying a rfc1042 header
1626 if (ieee80211_is_data(hdr
->frame_control
) &&
1627 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1628 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1630 if (ether_addr_equal(payload
, rfc1042_header
))
1631 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1635 memset(info
, 0, sizeof(*info
));
1637 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1638 IEEE80211_TX_CTL_INJECTED
;
1640 /* process and remove the injection radiotap header */
1641 if (!ieee80211_parse_tx_radiotap(skb
))
1647 * We process outgoing injected frames that have a local address
1648 * we handle as though they are non-injected frames.
1649 * This code here isn't entirely correct, the local MAC address
1650 * isn't always enough to find the interface to use; for proper
1651 * VLAN/WDS support we will need a different mechanism (which
1652 * likely isn't going to be monitor interfaces).
1654 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1656 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1657 if (!ieee80211_sdata_running(tmp_sdata
))
1659 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1660 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1661 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1663 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1669 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1670 if (!chanctx_conf
) {
1671 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1674 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1678 chan
= chanctx_conf
->def
.chan
;
1679 else if (!local
->use_chanctx
)
1680 chan
= local
->_oper_channel
;
1685 * Frame injection is not allowed if beaconing is not allowed
1686 * or if we need radar detection. Beaconing is usually not allowed when
1687 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1688 * Passive scan is also used in world regulatory domains where
1689 * your country is not known and as such it should be treated as
1690 * NO TX unless the channel is explicitly allowed in which case
1691 * your current regulatory domain would not have the passive scan
1694 * Since AP mode uses monitor interfaces to inject/TX management
1695 * frames we can make AP mode the exception to this rule once it
1696 * supports radar detection as its implementation can deal with
1697 * radar detection by itself. We can do that later by adding a
1698 * monitor flag interfaces used for AP support.
1700 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1701 IEEE80211_CHAN_PASSIVE_SCAN
)))
1704 ieee80211_xmit(sdata
, skb
, chan
->band
);
1707 return NETDEV_TX_OK
;
1713 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1717 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1718 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1719 * @skb: packet to be sent
1720 * @dev: incoming interface
1722 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1723 * not be freed, and caller is responsible for either retrying later or freeing
1726 * This function takes in an Ethernet header and encapsulates it with suitable
1727 * IEEE 802.11 header based on which interface the packet is coming in. The
1728 * encapsulated packet will then be passed to master interface, wlan#.11, for
1729 * transmission (through low-level driver).
1731 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1732 struct net_device
*dev
)
1734 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1735 struct ieee80211_local
*local
= sdata
->local
;
1736 struct ieee80211_tx_info
*info
;
1738 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1740 struct ieee80211_hdr hdr
;
1741 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1742 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1743 const u8
*encaps_data
;
1744 int encaps_len
, skip_header_bytes
;
1746 struct sta_info
*sta
= NULL
;
1747 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1748 bool tdls_direct
= false;
1752 struct ieee80211_chanctx_conf
*chanctx_conf
;
1753 struct ieee80211_sub_if_data
*ap_sdata
;
1754 enum ieee80211_band band
;
1756 if (unlikely(skb
->len
< ETH_HLEN
))
1759 /* convert Ethernet header to proper 802.11 header (based on
1760 * operation mode) */
1761 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1762 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1766 switch (sdata
->vif
.type
) {
1767 case NL80211_IFTYPE_AP_VLAN
:
1768 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1770 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1772 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1773 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1774 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1775 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1777 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1778 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1780 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1782 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1785 band
= chanctx_conf
->def
.chan
->band
;
1789 case NL80211_IFTYPE_AP
:
1790 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1792 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1793 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1794 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1796 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1797 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1800 band
= chanctx_conf
->def
.chan
->band
;
1802 case NL80211_IFTYPE_WDS
:
1803 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1805 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1806 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1807 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1808 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1811 * This is the exception! WDS style interfaces are prohibited
1812 * when channel contexts are in used so this must be valid
1814 band
= local
->hw
.conf
.channel
->band
;
1816 #ifdef CONFIG_MAC80211_MESH
1817 case NL80211_IFTYPE_MESH_POINT
:
1818 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1819 /* Do not send frames with mesh_ttl == 0 */
1820 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1824 if (!is_multicast_ether_addr(skb
->data
)) {
1825 mpath
= mesh_path_lookup(skb
->data
, sdata
);
1827 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1831 * Use address extension if it is a packet from
1832 * another interface or if we know the destination
1833 * is being proxied by a portal (i.e. portal address
1834 * differs from proxied address)
1836 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1837 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1838 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1839 skb
->data
, skb
->data
+ ETH_ALEN
);
1840 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1843 /* DS -> MBSS (802.11-2012 13.11.3.3).
1844 * For unicast with unknown forwarding information,
1845 * destination might be in the MBSS or if that fails
1846 * forwarded to another mesh gate. In either case
1847 * resolution will be handled in ieee80211_xmit(), so
1848 * leave the original DA. This also works for mcast */
1849 const u8
*mesh_da
= skb
->data
;
1852 mesh_da
= mppath
->mpp
;
1854 mesh_da
= mpath
->dst
;
1856 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1857 mesh_da
, sdata
->vif
.addr
);
1858 if (is_multicast_ether_addr(mesh_da
))
1859 /* DA TA mSA AE:SA */
1861 ieee80211_new_mesh_header(&mesh_hdr
,
1863 skb
->data
+ ETH_ALEN
,
1866 /* RA TA mDA mSA AE:DA SA */
1868 ieee80211_new_mesh_header(&mesh_hdr
,
1871 skb
->data
+ ETH_ALEN
);
1874 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1877 band
= chanctx_conf
->def
.chan
->band
;
1880 case NL80211_IFTYPE_STATION
:
1881 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1882 bool tdls_peer
= false;
1884 sta
= sta_info_get(sdata
, skb
->data
);
1886 authorized
= test_sta_flag(sta
,
1887 WLAN_STA_AUTHORIZED
);
1888 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1889 tdls_peer
= test_sta_flag(sta
,
1890 WLAN_STA_TDLS_PEER
);
1891 tdls_auth
= test_sta_flag(sta
,
1892 WLAN_STA_TDLS_PEER_AUTH
);
1896 * If the TDLS link is enabled, send everything
1897 * directly. Otherwise, allow TDLS setup frames
1898 * to be transmitted indirectly.
1900 tdls_direct
= tdls_peer
&& (tdls_auth
||
1901 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1902 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1906 /* link during setup - throw out frames to peer */
1911 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1912 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1913 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1915 } else if (sdata
->u
.mgd
.use_4addr
&&
1916 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1917 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1918 IEEE80211_FCTL_TODS
);
1920 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1921 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1922 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1923 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1926 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1928 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1929 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1930 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1933 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1936 band
= chanctx_conf
->def
.chan
->band
;
1938 case NL80211_IFTYPE_ADHOC
:
1940 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1941 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1942 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1944 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1947 band
= chanctx_conf
->def
.chan
->band
;
1954 * There's no need to try to look up the destination
1955 * if it is a multicast address (which can only happen
1958 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1960 sta
= sta_info_get(sdata
, hdr
.addr1
);
1962 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1963 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1967 /* For mesh, the use of the QoS header is mandatory */
1968 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1971 /* receiver and we are QoS enabled, use a QoS type frame */
1972 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1973 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1978 * Drop unicast frames to unauthorised stations unless they are
1979 * EAPOL frames from the local station.
1981 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1982 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1983 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1984 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1985 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1986 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1987 dev
->name
, hdr
.addr1
);
1990 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1995 if (unlikely(!multicast
&& skb
->sk
&&
1996 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1997 struct sk_buff
*orig_skb
= skb
;
1999 skb
= skb_clone(skb
, GFP_ATOMIC
);
2001 unsigned long flags
;
2004 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2005 r
= idr_get_new_above(&local
->ack_status_frames
,
2008 idr_pre_get(&local
->ack_status_frames
,
2010 r
= idr_get_new_above(&local
->ack_status_frames
,
2013 if (WARN_ON(!id
) || id
> 0xffff) {
2014 idr_remove(&local
->ack_status_frames
, id
);
2017 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2021 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2022 } else if (skb_shared(skb
)) {
2023 kfree_skb(orig_skb
);
2029 /* couldn't clone -- lose tx status ... */
2035 * If the skb is shared we need to obtain our own copy.
2037 if (skb_shared(skb
)) {
2038 struct sk_buff
*tmp_skb
= skb
;
2040 /* can't happen -- skb is a clone if info_id != 0 */
2043 skb
= skb_clone(skb
, GFP_ATOMIC
);
2050 hdr
.frame_control
= fc
;
2051 hdr
.duration_id
= 0;
2054 skip_header_bytes
= ETH_HLEN
;
2055 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2056 encaps_data
= bridge_tunnel_header
;
2057 encaps_len
= sizeof(bridge_tunnel_header
);
2058 skip_header_bytes
-= 2;
2059 } else if (ethertype
>= 0x600) {
2060 encaps_data
= rfc1042_header
;
2061 encaps_len
= sizeof(rfc1042_header
);
2062 skip_header_bytes
-= 2;
2068 nh_pos
= skb_network_header(skb
) - skb
->data
;
2069 h_pos
= skb_transport_header(skb
) - skb
->data
;
2071 skb_pull(skb
, skip_header_bytes
);
2072 nh_pos
-= skip_header_bytes
;
2073 h_pos
-= skip_header_bytes
;
2075 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2078 * So we need to modify the skb header and hence need a copy of
2079 * that. The head_need variable above doesn't, so far, include
2080 * the needed header space that we don't need right away. If we
2081 * can, then we don't reallocate right now but only after the
2082 * frame arrives at the master device (if it does...)
2084 * If we cannot, however, then we will reallocate to include all
2085 * the ever needed space. Also, if we need to reallocate it anyway,
2086 * make it big enough for everything we may ever need.
2089 if (head_need
> 0 || skb_cloned(skb
)) {
2090 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2091 head_need
+= local
->tx_headroom
;
2092 head_need
= max_t(int, 0, head_need
);
2093 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2094 ieee80211_free_txskb(&local
->hw
, skb
);
2101 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2102 nh_pos
+= encaps_len
;
2103 h_pos
+= encaps_len
;
2106 #ifdef CONFIG_MAC80211_MESH
2107 if (meshhdrlen
> 0) {
2108 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2109 nh_pos
+= meshhdrlen
;
2110 h_pos
+= meshhdrlen
;
2114 if (ieee80211_is_data_qos(fc
)) {
2115 __le16
*qos_control
;
2117 qos_control
= (__le16
*) skb_push(skb
, 2);
2118 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2120 * Maybe we could actually set some fields here, for now just
2121 * initialise to zero to indicate no special operation.
2125 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2130 dev
->stats
.tx_packets
++;
2131 dev
->stats
.tx_bytes
+= skb
->len
;
2133 /* Update skb pointers to various headers since this modified frame
2134 * is going to go through Linux networking code that may potentially
2135 * need things like pointer to IP header. */
2136 skb_set_mac_header(skb
, 0);
2137 skb_set_network_header(skb
, nh_pos
);
2138 skb_set_transport_header(skb
, h_pos
);
2140 info
= IEEE80211_SKB_CB(skb
);
2141 memset(info
, 0, sizeof(*info
));
2143 dev
->trans_start
= jiffies
;
2145 info
->flags
= info_flags
;
2146 info
->ack_frame_id
= info_id
;
2148 ieee80211_xmit(sdata
, skb
, band
);
2151 return NETDEV_TX_OK
;
2157 return NETDEV_TX_OK
;
2162 * ieee80211_clear_tx_pending may not be called in a context where
2163 * it is possible that it packets could come in again.
2165 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2167 struct sk_buff
*skb
;
2170 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2171 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2172 ieee80211_free_txskb(&local
->hw
, skb
);
2177 * Returns false if the frame couldn't be transmitted but was queued instead,
2178 * which in this case means re-queued -- take as an indication to stop sending
2179 * more pending frames.
2181 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2182 struct sk_buff
*skb
)
2184 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2185 struct ieee80211_sub_if_data
*sdata
;
2186 struct sta_info
*sta
;
2187 struct ieee80211_hdr
*hdr
;
2189 struct ieee80211_chanctx_conf
*chanctx_conf
;
2191 sdata
= vif_to_sdata(info
->control
.vif
);
2193 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2194 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2195 if (unlikely(!chanctx_conf
)) {
2199 result
= ieee80211_tx(sdata
, skb
, true,
2200 chanctx_conf
->def
.chan
->band
);
2202 struct sk_buff_head skbs
;
2204 __skb_queue_head_init(&skbs
);
2205 __skb_queue_tail(&skbs
, skb
);
2207 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2208 sta
= sta_info_get(sdata
, hdr
->addr1
);
2210 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2217 * Transmit all pending packets. Called from tasklet.
2219 void ieee80211_tx_pending(unsigned long data
)
2221 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2222 unsigned long flags
;
2228 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2229 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2231 * If queue is stopped by something other than due to pending
2232 * frames, or we have no pending frames, proceed to next queue.
2234 if (local
->queue_stop_reasons
[i
] ||
2235 skb_queue_empty(&local
->pending
[i
]))
2238 while (!skb_queue_empty(&local
->pending
[i
])) {
2239 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2240 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2242 if (WARN_ON(!info
->control
.vif
)) {
2243 ieee80211_free_txskb(&local
->hw
, skb
);
2247 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2250 txok
= ieee80211_tx_pending_skb(local
, skb
);
2251 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2257 if (skb_queue_empty(&local
->pending
[i
]))
2258 ieee80211_propagate_queue_wake(local
, i
);
2260 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2265 /* functions for drivers to get certain frames */
2267 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2269 struct sk_buff
*skb
)
2273 int i
, have_bits
= 0, n1
, n2
;
2275 /* Generate bitmap for TIM only if there are any STAs in power save
2277 if (atomic_read(&ps
->num_sta_ps
) > 0)
2278 /* in the hope that this is faster than
2279 * checking byte-for-byte */
2280 have_bits
= !bitmap_empty((unsigned long*)ps
->tim
,
2281 IEEE80211_MAX_AID
+1);
2283 if (ps
->dtim_count
== 0)
2284 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2288 tim
= pos
= (u8
*) skb_put(skb
, 6);
2289 *pos
++ = WLAN_EID_TIM
;
2291 *pos
++ = ps
->dtim_count
;
2292 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2294 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2297 ps
->dtim_bc_mc
= aid0
== 1;
2300 /* Find largest even number N1 so that bits numbered 1 through
2301 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2302 * (N2 + 1) x 8 through 2007 are 0. */
2304 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2311 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2318 /* Bitmap control */
2320 /* Part Virt Bitmap */
2321 skb_put(skb
, n2
- n1
);
2322 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2324 tim
[1] = n2
- n1
+ 4;
2326 *pos
++ = aid0
; /* Bitmap control */
2327 *pos
++ = 0; /* Part Virt Bitmap */
2331 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2332 struct ieee80211_vif
*vif
,
2333 u16
*tim_offset
, u16
*tim_length
)
2335 struct ieee80211_local
*local
= hw_to_local(hw
);
2336 struct sk_buff
*skb
= NULL
;
2337 struct ieee80211_tx_info
*info
;
2338 struct ieee80211_sub_if_data
*sdata
= NULL
;
2339 enum ieee80211_band band
;
2340 struct ieee80211_tx_rate_control txrc
;
2341 struct ieee80211_chanctx_conf
*chanctx_conf
;
2345 sdata
= vif_to_sdata(vif
);
2346 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2348 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2356 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2357 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2358 struct beacon_data
*beacon
= rcu_dereference(ap
->beacon
);
2362 * headroom, head length,
2363 * tail length and maximum TIM length
2365 skb
= dev_alloc_skb(local
->tx_headroom
+
2367 beacon
->tail_len
+ 256);
2371 skb_reserve(skb
, local
->tx_headroom
);
2372 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2376 * Not very nice, but we want to allow the driver to call
2377 * ieee80211_beacon_get() as a response to the set_tim()
2378 * callback. That, however, is already invoked under the
2379 * sta_lock to guarantee consistent and race-free update
2380 * of the tim bitmap in mac80211 and the driver.
2382 if (local
->tim_in_locked_section
) {
2383 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
);
2385 unsigned long flags
;
2387 spin_lock_irqsave(&local
->tim_lock
, flags
);
2388 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
);
2389 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
2393 *tim_offset
= beacon
->head_len
;
2395 *tim_length
= skb
->len
- beacon
->head_len
;
2398 memcpy(skb_put(skb
, beacon
->tail_len
),
2399 beacon
->tail
, beacon
->tail_len
);
2402 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2403 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2404 struct ieee80211_hdr
*hdr
;
2405 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2410 skb
= skb_copy(presp
, GFP_ATOMIC
);
2414 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2415 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2416 IEEE80211_STYPE_BEACON
);
2417 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2418 struct ieee80211_mgmt
*mgmt
;
2419 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2421 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2422 sizeof(mgmt
->u
.beacon
);
2424 #ifdef CONFIG_MAC80211_MESH
2425 if (!sdata
->u
.mesh
.mesh_id_len
)
2429 if (ifmsh
->sync_ops
)
2430 ifmsh
->sync_ops
->adjust_tbtt(
2433 skb
= dev_alloc_skb(local
->tx_headroom
+
2436 2 + 8 + /* supported rates */
2437 2 + 3 + /* DS params */
2438 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2439 2 + sizeof(struct ieee80211_ht_cap
) +
2440 2 + sizeof(struct ieee80211_ht_operation
) +
2441 2 + sdata
->u
.mesh
.mesh_id_len
+
2442 2 + sizeof(struct ieee80211_meshconf_ie
) +
2443 sdata
->u
.mesh
.ie_len
);
2447 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2448 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2449 memset(mgmt
, 0, hdr_len
);
2450 mgmt
->frame_control
=
2451 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2452 eth_broadcast_addr(mgmt
->da
);
2453 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2454 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2455 mgmt
->u
.beacon
.beacon_int
=
2456 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2457 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2458 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2460 pos
= skb_put(skb
, 2);
2461 *pos
++ = WLAN_EID_SSID
;
2464 band
= chanctx_conf
->def
.chan
->band
;
2466 if (ieee80211_add_srates_ie(sdata
, skb
, true, band
) ||
2467 mesh_add_ds_params_ie(skb
, sdata
) ||
2468 ieee80211_add_ext_srates_ie(sdata
, skb
, true, band
) ||
2469 mesh_add_rsn_ie(skb
, sdata
) ||
2470 mesh_add_ht_cap_ie(skb
, sdata
) ||
2471 mesh_add_ht_oper_ie(skb
, sdata
) ||
2472 mesh_add_meshid_ie(skb
, sdata
) ||
2473 mesh_add_meshconf_ie(skb
, sdata
) ||
2474 mesh_add_vendor_ies(skb
, sdata
)) {
2475 pr_err("o11s: couldn't add ies!\n");
2483 band
= chanctx_conf
->def
.chan
->band
;
2485 info
= IEEE80211_SKB_CB(skb
);
2487 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2488 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2491 memset(&txrc
, 0, sizeof(txrc
));
2493 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2494 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2496 txrc
.reported_rate
.idx
= -1;
2497 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2498 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2499 txrc
.max_rate_idx
= -1;
2501 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2502 memcpy(txrc
.rate_idx_mcs_mask
, sdata
->rc_rateidx_mcs_mask
[band
],
2503 sizeof(txrc
.rate_idx_mcs_mask
));
2505 rate_control_get_rate(sdata
, NULL
, &txrc
);
2507 info
->control
.vif
= vif
;
2509 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2510 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2511 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2516 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2518 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2519 struct ieee80211_vif
*vif
)
2521 struct ieee80211_if_ap
*ap
= NULL
;
2522 struct sk_buff
*skb
= NULL
;
2523 struct probe_resp
*presp
= NULL
;
2524 struct ieee80211_hdr
*hdr
;
2525 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2527 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2533 presp
= rcu_dereference(ap
->probe_resp
);
2537 skb
= dev_alloc_skb(presp
->len
);
2541 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2543 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2544 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2550 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2552 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2553 struct ieee80211_vif
*vif
)
2555 struct ieee80211_sub_if_data
*sdata
;
2556 struct ieee80211_if_managed
*ifmgd
;
2557 struct ieee80211_pspoll
*pspoll
;
2558 struct ieee80211_local
*local
;
2559 struct sk_buff
*skb
;
2561 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2564 sdata
= vif_to_sdata(vif
);
2565 ifmgd
= &sdata
->u
.mgd
;
2566 local
= sdata
->local
;
2568 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2572 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2574 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2575 memset(pspoll
, 0, sizeof(*pspoll
));
2576 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2577 IEEE80211_STYPE_PSPOLL
);
2578 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2580 /* aid in PS-Poll has its two MSBs each set to 1 */
2581 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2583 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2584 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2588 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2590 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2591 struct ieee80211_vif
*vif
)
2593 struct ieee80211_hdr_3addr
*nullfunc
;
2594 struct ieee80211_sub_if_data
*sdata
;
2595 struct ieee80211_if_managed
*ifmgd
;
2596 struct ieee80211_local
*local
;
2597 struct sk_buff
*skb
;
2599 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2602 sdata
= vif_to_sdata(vif
);
2603 ifmgd
= &sdata
->u
.mgd
;
2604 local
= sdata
->local
;
2606 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2610 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2612 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2614 memset(nullfunc
, 0, sizeof(*nullfunc
));
2615 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2616 IEEE80211_STYPE_NULLFUNC
|
2617 IEEE80211_FCTL_TODS
);
2618 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2619 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2620 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2624 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2626 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2627 struct ieee80211_vif
*vif
,
2628 const u8
*ssid
, size_t ssid_len
,
2631 struct ieee80211_sub_if_data
*sdata
;
2632 struct ieee80211_local
*local
;
2633 struct ieee80211_hdr_3addr
*hdr
;
2634 struct sk_buff
*skb
;
2638 sdata
= vif_to_sdata(vif
);
2639 local
= sdata
->local
;
2640 ie_ssid_len
= 2 + ssid_len
;
2642 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2643 ie_ssid_len
+ tailroom
);
2647 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2649 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2650 memset(hdr
, 0, sizeof(*hdr
));
2651 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2652 IEEE80211_STYPE_PROBE_REQ
);
2653 eth_broadcast_addr(hdr
->addr1
);
2654 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2655 eth_broadcast_addr(hdr
->addr3
);
2657 pos
= skb_put(skb
, ie_ssid_len
);
2658 *pos
++ = WLAN_EID_SSID
;
2661 memcpy(pos
, ssid
, ssid_len
);
2666 EXPORT_SYMBOL(ieee80211_probereq_get
);
2668 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2669 const void *frame
, size_t frame_len
,
2670 const struct ieee80211_tx_info
*frame_txctl
,
2671 struct ieee80211_rts
*rts
)
2673 const struct ieee80211_hdr
*hdr
= frame
;
2675 rts
->frame_control
=
2676 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2677 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2679 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2680 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2682 EXPORT_SYMBOL(ieee80211_rts_get
);
2684 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2685 const void *frame
, size_t frame_len
,
2686 const struct ieee80211_tx_info
*frame_txctl
,
2687 struct ieee80211_cts
*cts
)
2689 const struct ieee80211_hdr
*hdr
= frame
;
2691 cts
->frame_control
=
2692 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2693 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2694 frame_len
, frame_txctl
);
2695 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2697 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2700 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2701 struct ieee80211_vif
*vif
)
2703 struct ieee80211_local
*local
= hw_to_local(hw
);
2704 struct sk_buff
*skb
= NULL
;
2705 struct ieee80211_tx_data tx
;
2706 struct ieee80211_sub_if_data
*sdata
;
2708 struct ieee80211_tx_info
*info
;
2709 struct ieee80211_chanctx_conf
*chanctx_conf
;
2711 sdata
= vif_to_sdata(vif
);
2714 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2719 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2720 struct beacon_data
*beacon
=
2721 rcu_dereference(sdata
->u
.ap
.beacon
);
2723 if (!beacon
|| !beacon
->head
)
2726 ps
= &sdata
->u
.ap
.ps
;
2731 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
2732 goto out
; /* send buffered bc/mc only after DTIM beacon */
2735 skb
= skb_dequeue(&ps
->bc_buf
);
2738 local
->total_ps_buffered
--;
2740 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
2741 struct ieee80211_hdr
*hdr
=
2742 (struct ieee80211_hdr
*) skb
->data
;
2743 /* more buffered multicast/broadcast frames ==> set
2744 * MoreData flag in IEEE 802.11 header to inform PS
2746 hdr
->frame_control
|=
2747 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2750 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2752 dev_kfree_skb_any(skb
);
2755 info
= IEEE80211_SKB_CB(skb
);
2757 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2758 info
->band
= chanctx_conf
->def
.chan
->band
;
2760 if (invoke_tx_handlers(&tx
))
2767 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2769 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
2770 struct sk_buff
*skb
, int tid
,
2771 enum ieee80211_band band
)
2773 int ac
= ieee802_1d_to_ac
[tid
& 7];
2775 skb_set_mac_header(skb
, 0);
2776 skb_set_network_header(skb
, 0);
2777 skb_set_transport_header(skb
, 0);
2779 skb_set_queue_mapping(skb
, ac
);
2780 skb
->priority
= tid
;
2783 * The other path calling ieee80211_xmit is from the tasklet,
2784 * and while we can handle concurrent transmissions locking
2785 * requirements are that we do not come into tx with bhs on.
2788 ieee80211_xmit(sdata
, skb
, band
);