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
, shift
= 0;
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
);
49 struct ieee80211_chanctx_conf
*chanctx_conf
;
53 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
55 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
56 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
60 /* assume HW handles this */
61 if (tx
->rate
.flags
& IEEE80211_TX_RC_MCS
)
65 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
68 sband
= local
->hw
.wiphy
->bands
[info
->band
];
69 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
71 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
74 * data and mgmt (except PS Poll):
76 * - during contention period:
77 * if addr1 is group address: 0
78 * if more fragments = 0 and addr1 is individual address: time to
79 * transmit one ACK plus SIFS
80 * if more fragments = 1 and addr1 is individual address: time to
81 * transmit next fragment plus 2 x ACK plus 3 x SIFS
84 * - control response frame (CTS or ACK) shall be transmitted using the
85 * same rate as the immediately previous frame in the frame exchange
86 * sequence, if this rate belongs to the PHY mandatory rates, or else
87 * at the highest possible rate belonging to the PHY rates in the
90 hdr
= (struct ieee80211_hdr
*)skb
->data
;
91 if (ieee80211_is_ctl(hdr
->frame_control
)) {
92 /* TODO: These control frames are not currently sent by
93 * mac80211, but should they be implemented, this function
94 * needs to be updated to support duration field calculation.
96 * RTS: time needed to transmit pending data/mgmt frame plus
97 * one CTS frame plus one ACK frame plus 3 x SIFS
98 * CTS: duration of immediately previous RTS minus time
99 * required to transmit CTS and its SIFS
100 * ACK: 0 if immediately previous directed data/mgmt had
101 * more=0, with more=1 duration in ACK frame is duration
102 * from previous frame minus time needed to transmit ACK
104 * PS Poll: BIT(15) | BIT(14) | aid
110 if (0 /* FIX: data/mgmt during CFP */)
111 return cpu_to_le16(32768);
113 if (group_addr
) /* Group address as the destination - no ACK */
116 /* Individual destination address:
117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
118 * CTS and ACK frames shall be transmitted using the highest rate in
119 * basic rate set that is less than or equal to the rate of the
120 * immediately previous frame and that is using the same modulation
121 * (CCK or OFDM). If no basic rate set matches with these requirements,
122 * the highest mandatory rate of the PHY that is less than or equal to
123 * the rate of the previous frame is used.
124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
127 /* use lowest available if everything fails */
128 mrate
= sband
->bitrates
[0].bitrate
;
129 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
130 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
132 if (r
->bitrate
> txrate
->bitrate
)
135 if ((rate_flags
& r
->flags
) != rate_flags
)
138 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
139 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
141 switch (sband
->band
) {
142 case IEEE80211_BAND_2GHZ
: {
144 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
145 flag
= IEEE80211_RATE_MANDATORY_G
;
147 flag
= IEEE80211_RATE_MANDATORY_B
;
152 case IEEE80211_BAND_5GHZ
:
153 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
156 case IEEE80211_BAND_60GHZ
:
157 /* TODO, for now fall through */
158 case IEEE80211_NUM_BANDS
:
164 /* No matching basic rate found; use highest suitable mandatory
166 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
170 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
171 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
178 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur
*= 2; /* ACK + SIFS */
186 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
187 txrate
->bitrate
, erp
,
188 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
192 return cpu_to_le16(dur
);
196 static ieee80211_tx_result debug_noinline
197 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
199 struct ieee80211_local
*local
= tx
->local
;
200 struct ieee80211_if_managed
*ifmgd
;
202 /* driver doesn't support power save */
203 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
206 /* hardware does dynamic power save */
207 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
210 /* dynamic power save disabled */
211 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
214 /* we are scanning, don't enable power save */
218 if (!local
->ps_sdata
)
221 /* No point if we're going to suspend */
222 if (local
->quiescing
)
225 /* dynamic ps is supported only in managed mode */
226 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
229 ifmgd
= &tx
->sdata
->u
.mgd
;
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
244 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
245 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
246 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
249 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
250 ieee80211_stop_queues_by_reason(&local
->hw
,
251 IEEE80211_MAX_QUEUE_MAP
,
252 IEEE80211_QUEUE_STOP_REASON_PS
);
253 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
254 ieee80211_queue_work(&local
->hw
,
255 &local
->dynamic_ps_disable_work
);
258 /* Don't restart the timer if we're not disassociated */
259 if (!ifmgd
->associated
)
262 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
263 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
268 static ieee80211_tx_result debug_noinline
269 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
272 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
273 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
276 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
279 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
280 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
281 !ieee80211_is_probe_req(hdr
->frame_control
) &&
282 !ieee80211_is_nullfunc(hdr
->frame_control
))
284 * When software scanning only nullfunc frames (to notify
285 * the sleep state to the AP) and probe requests (for the
286 * active scan) are allowed, all other frames should not be
287 * sent and we should not get here, but if we do
288 * nonetheless, drop them to avoid sending them
289 * off-channel. See the link below and
290 * ieee80211_start_scan() for more.
292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
296 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
299 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
302 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
306 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
308 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
309 if (unlikely(!assoc
&&
310 ieee80211_is_data(hdr
->frame_control
))) {
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
312 sdata_info(tx
->sdata
,
313 "dropped data frame to not associated station %pM\n",
316 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
319 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
320 ieee80211_is_data(hdr
->frame_control
) &&
321 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
323 * No associated STAs - no need to send multicast
332 /* This function is called whenever the AP is about to exceed the maximum limit
333 * of buffered frames for power saving STAs. This situation should not really
334 * happen often during normal operation, so dropping the oldest buffered packet
335 * from each queue should be OK to make some room for new frames. */
336 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
338 int total
= 0, purged
= 0;
340 struct ieee80211_sub_if_data
*sdata
;
341 struct sta_info
*sta
;
343 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
346 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
347 ps
= &sdata
->u
.ap
.ps
;
348 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
349 ps
= &sdata
->u
.mesh
.ps
;
353 skb
= skb_dequeue(&ps
->bc_buf
);
358 total
+= skb_queue_len(&ps
->bc_buf
);
362 * Drop one frame from each station from the lowest-priority
363 * AC that has frames at all.
365 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
368 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
369 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
370 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
373 ieee80211_free_txskb(&local
->hw
, skb
);
379 local
->total_ps_buffered
= total
;
380 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
383 static ieee80211_tx_result
384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
386 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
387 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
391 * broadcast/multicast frame
393 * If any of the associated/peer stations is in power save mode,
394 * the frame is buffered to be sent after DTIM beacon frame.
395 * This is done either by the hardware or us.
398 /* powersaving STAs currently only in AP/VLAN/mesh mode */
399 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
400 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
404 ps
= &tx
->sdata
->bss
->ps
;
405 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
406 ps
= &tx
->sdata
->u
.mesh
.ps
;
412 /* no buffering for ordered frames */
413 if (ieee80211_has_order(hdr
->frame_control
))
416 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
417 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
419 /* no stations in PS mode */
420 if (!atomic_read(&ps
->num_sta_ps
))
423 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
425 /* device releases frame after DTIM beacon */
426 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
429 /* buffered in mac80211 */
430 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
431 purge_old_ps_buffers(tx
->local
);
433 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
435 "BC TX buffer full - dropping the oldest frame\n");
436 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
438 tx
->local
->total_ps_buffered
++;
440 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
445 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
448 if (!ieee80211_is_mgmt(fc
))
451 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
461 static ieee80211_tx_result
462 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
464 struct sta_info
*sta
= tx
->sta
;
465 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
466 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
467 struct ieee80211_local
*local
= tx
->local
;
472 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
473 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
474 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
475 int ac
= skb_get_queue_mapping(tx
->skb
);
477 /* only deauth, disassoc and action are bufferable MMPDUs */
478 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
479 !ieee80211_is_deauth(hdr
->frame_control
) &&
480 !ieee80211_is_disassoc(hdr
->frame_control
) &&
481 !ieee80211_is_action(hdr
->frame_control
)) {
482 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
486 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
487 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
488 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
489 purge_old_ps_buffers(tx
->local
);
490 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
491 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
493 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
495 ieee80211_free_txskb(&local
->hw
, old
);
497 tx
->local
->total_ps_buffered
++;
499 info
->control
.jiffies
= jiffies
;
500 info
->control
.vif
= &tx
->sdata
->vif
;
501 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
502 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
504 if (!timer_pending(&local
->sta_cleanup
))
505 mod_timer(&local
->sta_cleanup
,
506 round_jiffies(jiffies
+
507 STA_INFO_CLEANUP_INTERVAL
));
510 * We queued up some frames, so the TIM bit might
511 * need to be set, recalculate it.
513 sta_info_recalc_tim(sta
);
516 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
518 "STA %pM in PS mode, but polling/in SP -> send frame\n",
525 static ieee80211_tx_result debug_noinline
526 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
528 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
531 if (tx
->flags
& IEEE80211_TX_UNICAST
)
532 return ieee80211_tx_h_unicast_ps_buf(tx
);
534 return ieee80211_tx_h_multicast_ps_buf(tx
);
537 static ieee80211_tx_result debug_noinline
538 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
540 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
542 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
543 tx
->sdata
->control_port_no_encrypt
))
544 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
549 static ieee80211_tx_result debug_noinline
550 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
552 struct ieee80211_key
*key
;
553 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
554 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
556 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
558 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
560 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
561 is_multicast_ether_addr(hdr
->addr1
) &&
562 ieee80211_is_robust_mgmt_frame(hdr
) &&
563 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
565 else if (is_multicast_ether_addr(hdr
->addr1
) &&
566 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
568 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
569 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
571 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
573 else if (!tx
->sdata
->drop_unencrypted
)
575 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
577 else if (ieee80211_is_robust_mgmt_frame(hdr
) &&
578 !(ieee80211_is_action(hdr
->frame_control
) &&
579 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
581 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
582 !ieee80211_is_robust_mgmt_frame(hdr
))
585 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
590 bool skip_hw
= false;
592 tx
->key
->tx_rx_count
++;
593 /* TODO: add threshold stuff again */
595 switch (tx
->key
->conf
.cipher
) {
596 case WLAN_CIPHER_SUITE_WEP40
:
597 case WLAN_CIPHER_SUITE_WEP104
:
598 case WLAN_CIPHER_SUITE_TKIP
:
599 if (!ieee80211_is_data_present(hdr
->frame_control
))
602 case WLAN_CIPHER_SUITE_CCMP
:
603 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
604 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
608 skip_hw
= (tx
->key
->conf
.flags
&
609 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
610 ieee80211_is_mgmt(hdr
->frame_control
);
612 case WLAN_CIPHER_SUITE_AES_CMAC
:
613 if (!ieee80211_is_mgmt(hdr
->frame_control
))
618 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
619 !ieee80211_is_deauth(hdr
->frame_control
)))
622 if (!skip_hw
&& tx
->key
&&
623 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
624 info
->control
.hw_key
= &tx
->key
->conf
;
630 static ieee80211_tx_result debug_noinline
631 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
633 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
634 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
635 struct ieee80211_supported_band
*sband
;
637 struct ieee80211_tx_rate_control txrc
;
638 struct ieee80211_sta_rates
*ratetbl
= NULL
;
641 memset(&txrc
, 0, sizeof(txrc
));
643 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
645 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
646 tx
->local
->hw
.wiphy
->frag_threshold
);
648 /* set up the tx rate control struct we give the RC algo */
649 txrc
.hw
= &tx
->local
->hw
;
651 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
653 txrc
.reported_rate
.idx
= -1;
654 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
655 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
656 txrc
.max_rate_idx
= -1;
658 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
660 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
661 txrc
.rate_idx_mcs_mask
=
662 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
664 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
665 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
666 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
668 /* set up RTS protection if desired */
669 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
673 info
->control
.use_rts
= txrc
.rts
;
674 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
677 * Use short preamble if the BSS can handle it, but not for
678 * management frames unless we know the receiver can handle
679 * that -- the management frame might be to a station that
680 * just wants a probe response.
682 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
683 (ieee80211_is_data(hdr
->frame_control
) ||
684 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
685 txrc
.short_preamble
= true;
687 info
->control
.short_preamble
= txrc
.short_preamble
;
690 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
693 * Lets not bother rate control if we're associated and cannot
694 * talk to the sta. This should not happen.
696 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
697 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
698 "%s: Dropped data frame as no usable bitrate found while "
699 "scanning and associated. Target station: "
700 "%pM on %d GHz band\n",
701 tx
->sdata
->name
, hdr
->addr1
,
706 * If we're associated with the sta at this point we know we can at
707 * least send the frame at the lowest bit rate.
709 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
711 if (tx
->sta
&& !info
->control
.skip_table
)
712 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
714 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
716 struct ieee80211_tx_rate rate
= {
717 .idx
= ratetbl
->rate
[0].idx
,
718 .flags
= ratetbl
->rate
[0].flags
,
719 .count
= ratetbl
->rate
[0].count
722 if (ratetbl
->rate
[0].idx
< 0)
730 tx
->rate
= info
->control
.rates
[0];
733 if (txrc
.reported_rate
.idx
< 0) {
734 txrc
.reported_rate
= tx
->rate
;
735 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
736 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
738 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
743 if (unlikely(!info
->control
.rates
[0].count
))
744 info
->control
.rates
[0].count
= 1;
746 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
747 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
748 info
->control
.rates
[0].count
= 1;
753 static ieee80211_tx_result debug_noinline
754 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
756 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
757 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
763 * Packet injection may want to control the sequence
764 * number, if we have no matching interface then we
765 * neither assign one ourselves nor ask the driver to.
767 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
770 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
773 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
776 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
780 * Anything but QoS data that has a sequence number field
781 * (is long enough) gets a sequence number from the global
784 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
785 /* driver should assign sequence number */
786 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
787 /* for pure STA mode without beacons, we can do it */
788 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
789 tx
->sdata
->sequence_number
+= 0x10;
794 * This should be true for injected/management frames only, for
795 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
796 * above since they are not QoS-data frames.
801 /* include per-STA, per-TID sequence counter */
803 qc
= ieee80211_get_qos_ctl(hdr
);
804 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
805 seq
= &tx
->sta
->tid_seq
[tid
];
807 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
809 /* Increase the sequence number. */
810 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
815 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
816 struct sk_buff
*skb
, int hdrlen
,
819 struct ieee80211_local
*local
= tx
->local
;
820 struct ieee80211_tx_info
*info
;
822 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
823 int pos
= hdrlen
+ per_fragm
;
824 int rem
= skb
->len
- hdrlen
- per_fragm
;
826 if (WARN_ON(rem
< 0))
829 /* first fragment was already added to queue by caller */
832 int fraglen
= per_fragm
;
837 tmp
= dev_alloc_skb(local
->tx_headroom
+
839 IEEE80211_ENCRYPT_HEADROOM
+
840 IEEE80211_ENCRYPT_TAILROOM
);
844 __skb_queue_tail(&tx
->skbs
, tmp
);
846 skb_reserve(tmp
, local
->tx_headroom
+
847 IEEE80211_ENCRYPT_HEADROOM
);
848 /* copy control information */
849 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
851 info
= IEEE80211_SKB_CB(tmp
);
852 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
853 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
856 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
858 skb_copy_queue_mapping(tmp
, skb
);
859 tmp
->priority
= skb
->priority
;
862 /* copy header and data */
863 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
864 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
869 /* adjust first fragment's length */
870 skb
->len
= hdrlen
+ per_fragm
;
874 static ieee80211_tx_result debug_noinline
875 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
877 struct sk_buff
*skb
= tx
->skb
;
878 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
879 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
880 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
884 /* no matter what happens, tx->skb moves to tx->skbs */
885 __skb_queue_tail(&tx
->skbs
, skb
);
888 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
891 if (tx
->local
->ops
->set_frag_threshold
)
895 * Warn when submitting a fragmented A-MPDU frame and drop it.
896 * This scenario is handled in ieee80211_tx_prepare but extra
897 * caution taken here as fragmented ampdu may cause Tx stop.
899 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
902 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
904 /* internal error, why isn't DONTFRAG set? */
905 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
909 * Now fragment the frame. This will allocate all the fragments and
910 * chain them (using skb as the first fragment) to skb->next.
911 * During transmission, we will remove the successfully transmitted
912 * fragments from this list. When the low-level driver rejects one
913 * of the fragments then we will simply pretend to accept the skb
914 * but store it away as pending.
916 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
919 /* update duration/seq/flags of fragments */
922 skb_queue_walk(&tx
->skbs
, skb
) {
923 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
925 hdr
= (void *)skb
->data
;
926 info
= IEEE80211_SKB_CB(skb
);
928 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
929 hdr
->frame_control
|= morefrags
;
931 * No multi-rate retries for fragmented frames, that
932 * would completely throw off the NAV at other STAs.
934 info
->control
.rates
[1].idx
= -1;
935 info
->control
.rates
[2].idx
= -1;
936 info
->control
.rates
[3].idx
= -1;
937 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
938 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
940 hdr
->frame_control
&= ~morefrags
;
942 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
949 static ieee80211_tx_result debug_noinline
950 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
958 skb_queue_walk(&tx
->skbs
, skb
) {
959 ac
= skb_get_queue_mapping(skb
);
960 tx
->sta
->tx_fragments
++;
961 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
964 tx
->sta
->tx_packets
[ac
]++;
969 static ieee80211_tx_result debug_noinline
970 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
975 switch (tx
->key
->conf
.cipher
) {
976 case WLAN_CIPHER_SUITE_WEP40
:
977 case WLAN_CIPHER_SUITE_WEP104
:
978 return ieee80211_crypto_wep_encrypt(tx
);
979 case WLAN_CIPHER_SUITE_TKIP
:
980 return ieee80211_crypto_tkip_encrypt(tx
);
981 case WLAN_CIPHER_SUITE_CCMP
:
982 return ieee80211_crypto_ccmp_encrypt(tx
);
983 case WLAN_CIPHER_SUITE_AES_CMAC
:
984 return ieee80211_crypto_aes_cmac_encrypt(tx
);
986 return ieee80211_crypto_hw_encrypt(tx
);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
996 struct ieee80211_hdr
*hdr
;
1000 skb_queue_walk(&tx
->skbs
, skb
) {
1001 hdr
= (void *) skb
->data
;
1002 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1003 break; /* must not overwrite AID */
1004 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1005 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1006 next_len
= next
->len
;
1009 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1012 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1018 /* actual transmit path */
1020 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1021 struct sk_buff
*skb
,
1022 struct ieee80211_tx_info
*info
,
1023 struct tid_ampdu_tx
*tid_tx
,
1026 bool queued
= false;
1027 bool reset_agg_timer
= false;
1028 struct sk_buff
*purge_skb
= NULL
;
1030 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1031 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1032 reset_agg_timer
= true;
1033 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1035 * nothing -- this aggregation session is being started
1036 * but that might still fail with the driver
1039 spin_lock(&tx
->sta
->lock
);
1041 * Need to re-check now, because we may get here
1043 * 1) in the window during which the setup is actually
1044 * already done, but not marked yet because not all
1045 * packets are spliced over to the driver pending
1046 * queue yet -- if this happened we acquire the lock
1047 * either before or after the splice happens, but
1048 * need to recheck which of these cases happened.
1050 * 2) during session teardown, if the OPERATIONAL bit
1051 * was cleared due to the teardown but the pointer
1052 * hasn't been assigned NULL yet (or we loaded it
1053 * before it was assigned) -- in this case it may
1054 * now be NULL which means we should just let the
1055 * packet pass through because splicing the frames
1056 * back is already done.
1058 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1061 /* do nothing, let packet pass through */
1062 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1063 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1064 reset_agg_timer
= true;
1067 info
->control
.vif
= &tx
->sdata
->vif
;
1068 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1069 __skb_queue_tail(&tid_tx
->pending
, skb
);
1070 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1071 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1073 spin_unlock(&tx
->sta
->lock
);
1076 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1079 /* reset session timer */
1080 if (reset_agg_timer
&& tid_tx
->timeout
)
1081 tid_tx
->last_tx
= jiffies
;
1089 static ieee80211_tx_result
1090 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1091 struct ieee80211_tx_data
*tx
,
1092 struct sk_buff
*skb
)
1094 struct ieee80211_local
*local
= sdata
->local
;
1095 struct ieee80211_hdr
*hdr
;
1096 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1100 memset(tx
, 0, sizeof(*tx
));
1104 __skb_queue_head_init(&tx
->skbs
);
1107 * If this flag is set to true anywhere, and we get here,
1108 * we are doing the needed processing, so remove the flag
1111 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1113 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1115 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1116 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1117 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1119 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1120 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1121 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1124 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1126 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1127 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1128 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1129 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1130 struct tid_ampdu_tx
*tid_tx
;
1132 qc
= ieee80211_get_qos_ctl(hdr
);
1133 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1135 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1139 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1142 if (unlikely(queued
))
1147 if (is_multicast_ether_addr(hdr
->addr1
)) {
1148 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1149 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1151 tx
->flags
|= IEEE80211_TX_UNICAST
;
1153 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1154 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1155 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1156 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1157 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1161 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1162 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1163 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1165 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1170 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1171 struct ieee80211_vif
*vif
,
1172 struct ieee80211_sta
*sta
,
1173 struct sk_buff_head
*skbs
,
1176 struct ieee80211_tx_control control
;
1177 struct sk_buff
*skb
, *tmp
;
1178 unsigned long flags
;
1180 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1181 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1182 int q
= info
->hw_queue
;
1184 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1185 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1186 __skb_unlink(skb
, skbs
);
1187 ieee80211_free_txskb(&local
->hw
, skb
);
1192 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1193 if (local
->queue_stop_reasons
[q
] ||
1194 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1195 if (unlikely(info
->flags
&
1196 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1197 if (local
->queue_stop_reasons
[q
] &
1198 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1200 * Drop off-channel frames if queues
1201 * are stopped for any reason other
1202 * than off-channel operation. Never
1205 spin_unlock_irqrestore(
1206 &local
->queue_stop_reason_lock
,
1208 ieee80211_purge_tx_queue(&local
->hw
,
1215 * Since queue is stopped, queue up frames for
1216 * later transmission from the tx-pending
1217 * tasklet when the queue is woken again.
1220 skb_queue_splice_init(skbs
,
1221 &local
->pending
[q
]);
1223 skb_queue_splice_tail_init(skbs
,
1224 &local
->pending
[q
]);
1226 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1231 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1233 info
->control
.vif
= vif
;
1236 __skb_unlink(skb
, skbs
);
1237 drv_tx(local
, &control
, skb
);
1244 * Returns false if the frame couldn't be transmitted but was queued instead.
1246 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1247 struct sk_buff_head
*skbs
, int led_len
,
1248 struct sta_info
*sta
, bool txpending
)
1250 struct ieee80211_tx_info
*info
;
1251 struct ieee80211_sub_if_data
*sdata
;
1252 struct ieee80211_vif
*vif
;
1253 struct ieee80211_sta
*pubsta
;
1254 struct sk_buff
*skb
;
1258 if (WARN_ON(skb_queue_empty(skbs
)))
1261 skb
= skb_peek(skbs
);
1262 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1263 info
= IEEE80211_SKB_CB(skb
);
1264 sdata
= vif_to_sdata(info
->control
.vif
);
1265 if (sta
&& !sta
->uploaded
)
1273 switch (sdata
->vif
.type
) {
1274 case NL80211_IFTYPE_MONITOR
:
1275 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1279 sdata
= rcu_dereference(local
->monitor_sdata
);
1283 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1284 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1290 case NL80211_IFTYPE_AP_VLAN
:
1291 sdata
= container_of(sdata
->bss
,
1292 struct ieee80211_sub_if_data
, u
.ap
);
1299 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1302 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1304 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1310 * Invoke TX handlers, return 0 on success and non-zero if the
1311 * frame was dropped or queued.
1313 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1315 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1316 ieee80211_tx_result res
= TX_DROP
;
1318 #define CALL_TXH(txh) \
1321 if (res != TX_CONTINUE) \
1325 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1326 CALL_TXH(ieee80211_tx_h_check_assoc
);
1327 CALL_TXH(ieee80211_tx_h_ps_buf
);
1328 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1329 CALL_TXH(ieee80211_tx_h_select_key
);
1330 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1331 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1333 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1334 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1339 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1340 CALL_TXH(ieee80211_tx_h_sequence
);
1341 CALL_TXH(ieee80211_tx_h_fragment
);
1342 /* handlers after fragment must be aware of tx info fragmentation! */
1343 CALL_TXH(ieee80211_tx_h_stats
);
1344 CALL_TXH(ieee80211_tx_h_encrypt
);
1345 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1346 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1350 if (unlikely(res
== TX_DROP
)) {
1351 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1353 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1355 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1357 } else if (unlikely(res
== TX_QUEUED
)) {
1358 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1366 * Returns false if the frame couldn't be transmitted but was queued instead.
1368 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1369 struct sk_buff
*skb
, bool txpending
,
1370 enum ieee80211_band band
)
1372 struct ieee80211_local
*local
= sdata
->local
;
1373 struct ieee80211_tx_data tx
;
1374 ieee80211_tx_result res_prepare
;
1375 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1379 if (unlikely(skb
->len
< 10)) {
1384 /* initialises tx */
1386 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1388 if (unlikely(res_prepare
== TX_DROP
)) {
1389 ieee80211_free_txskb(&local
->hw
, skb
);
1391 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1397 /* set up hw_queue value early */
1398 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1399 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1401 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1403 if (!invoke_tx_handlers(&tx
))
1404 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1410 /* device xmit handlers */
1412 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1413 struct sk_buff
*skb
,
1414 int head_need
, bool may_encrypt
)
1416 struct ieee80211_local
*local
= sdata
->local
;
1419 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1420 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1421 tail_need
-= skb_tailroom(skb
);
1422 tail_need
= max_t(int, tail_need
, 0);
1425 if (skb_cloned(skb
))
1426 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1427 else if (head_need
|| tail_need
)
1428 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1432 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1433 wiphy_debug(local
->hw
.wiphy
,
1434 "failed to reallocate TX buffer\n");
1441 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
1442 enum ieee80211_band band
)
1444 struct ieee80211_local
*local
= sdata
->local
;
1445 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1446 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1450 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1452 headroom
= local
->tx_headroom
;
1454 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1455 headroom
-= skb_headroom(skb
);
1456 headroom
= max_t(int, 0, headroom
);
1458 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1459 ieee80211_free_txskb(&local
->hw
, skb
);
1463 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1464 info
->control
.vif
= &sdata
->vif
;
1466 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1467 if (ieee80211_is_data(hdr
->frame_control
) &&
1468 is_unicast_ether_addr(hdr
->addr1
)) {
1469 if (mesh_nexthop_resolve(sdata
, skb
))
1470 return; /* skb queued: don't free */
1472 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1476 ieee80211_set_qos_hdr(sdata
, skb
);
1477 ieee80211_tx(sdata
, skb
, false, band
);
1480 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1482 struct ieee80211_radiotap_iterator iterator
;
1483 struct ieee80211_radiotap_header
*rthdr
=
1484 (struct ieee80211_radiotap_header
*) skb
->data
;
1485 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1486 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1490 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1491 IEEE80211_TX_CTL_DONTFRAG
;
1494 * for every radiotap entry that is present
1495 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1496 * entries present, or -EINVAL on error)
1500 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1505 /* see if this argument is something we can use */
1506 switch (iterator
.this_arg_index
) {
1508 * You must take care when dereferencing iterator.this_arg
1509 * for multibyte types... the pointer is not aligned. Use
1510 * get_unaligned((type *)iterator.this_arg) to dereference
1511 * iterator.this_arg for type "type" safely on all arches.
1513 case IEEE80211_RADIOTAP_FLAGS
:
1514 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1516 * this indicates that the skb we have been
1517 * handed has the 32-bit FCS CRC at the end...
1518 * we should react to that by snipping it off
1519 * because it will be recomputed and added
1522 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1525 skb_trim(skb
, skb
->len
- FCS_LEN
);
1527 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1528 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1529 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1530 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1533 case IEEE80211_RADIOTAP_TX_FLAGS
:
1534 txflags
= get_unaligned_le16(iterator
.this_arg
);
1535 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1536 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1540 * Please update the file
1541 * Documentation/networking/mac80211-injection.txt
1542 * when parsing new fields here.
1550 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1554 * remove the radiotap header
1555 * iterator->_max_length was sanity-checked against
1556 * skb->len by iterator init
1558 skb_pull(skb
, iterator
._max_length
);
1563 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1564 struct net_device
*dev
)
1566 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1567 struct ieee80211_chanctx_conf
*chanctx_conf
;
1568 struct ieee80211_channel
*chan
;
1569 struct ieee80211_radiotap_header
*prthdr
=
1570 (struct ieee80211_radiotap_header
*)skb
->data
;
1571 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1572 struct ieee80211_hdr
*hdr
;
1573 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1577 /* check for not even having the fixed radiotap header part */
1578 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1579 goto fail
; /* too short to be possibly valid */
1581 /* is it a header version we can trust to find length from? */
1582 if (unlikely(prthdr
->it_version
))
1583 goto fail
; /* only version 0 is supported */
1585 /* then there must be a radiotap header with a length we can use */
1586 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1588 /* does the skb contain enough to deliver on the alleged length? */
1589 if (unlikely(skb
->len
< len_rthdr
))
1590 goto fail
; /* skb too short for claimed rt header extent */
1593 * fix up the pointers accounting for the radiotap
1594 * header still being in there. We are being given
1595 * a precooked IEEE80211 header so no need for
1598 skb_set_mac_header(skb
, len_rthdr
);
1600 * these are just fixed to the end of the rt area since we
1601 * don't have any better information and at this point, nobody cares
1603 skb_set_network_header(skb
, len_rthdr
);
1604 skb_set_transport_header(skb
, len_rthdr
);
1606 if (skb
->len
< len_rthdr
+ 2)
1609 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1610 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1612 if (skb
->len
< len_rthdr
+ hdrlen
)
1616 * Initialize skb->protocol if the injected frame is a data frame
1617 * carrying a rfc1042 header
1619 if (ieee80211_is_data(hdr
->frame_control
) &&
1620 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1621 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1623 if (ether_addr_equal(payload
, rfc1042_header
))
1624 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1628 memset(info
, 0, sizeof(*info
));
1630 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1631 IEEE80211_TX_CTL_INJECTED
;
1633 /* process and remove the injection radiotap header */
1634 if (!ieee80211_parse_tx_radiotap(skb
))
1640 * We process outgoing injected frames that have a local address
1641 * we handle as though they are non-injected frames.
1642 * This code here isn't entirely correct, the local MAC address
1643 * isn't always enough to find the interface to use; for proper
1644 * VLAN/WDS support we will need a different mechanism (which
1645 * likely isn't going to be monitor interfaces).
1647 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1649 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1650 if (!ieee80211_sdata_running(tmp_sdata
))
1652 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1653 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1654 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1656 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1662 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1663 if (!chanctx_conf
) {
1664 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1667 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1671 chan
= chanctx_conf
->def
.chan
;
1672 else if (!local
->use_chanctx
)
1673 chan
= local
->_oper_chandef
.chan
;
1678 * Frame injection is not allowed if beaconing is not allowed
1679 * or if we need radar detection. Beaconing is usually not allowed when
1680 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1681 * Passive scan is also used in world regulatory domains where
1682 * your country is not known and as such it should be treated as
1683 * NO TX unless the channel is explicitly allowed in which case
1684 * your current regulatory domain would not have the passive scan
1687 * Since AP mode uses monitor interfaces to inject/TX management
1688 * frames we can make AP mode the exception to this rule once it
1689 * supports radar detection as its implementation can deal with
1690 * radar detection by itself. We can do that later by adding a
1691 * monitor flag interfaces used for AP support.
1693 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1694 IEEE80211_CHAN_PASSIVE_SCAN
)))
1697 ieee80211_xmit(sdata
, skb
, chan
->band
);
1700 return NETDEV_TX_OK
;
1706 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1710 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1711 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1712 * @skb: packet to be sent
1713 * @dev: incoming interface
1715 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1716 * not be freed, and caller is responsible for either retrying later or freeing
1719 * This function takes in an Ethernet header and encapsulates it with suitable
1720 * IEEE 802.11 header based on which interface the packet is coming in. The
1721 * encapsulated packet will then be passed to master interface, wlan#.11, for
1722 * transmission (through low-level driver).
1724 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1725 struct net_device
*dev
)
1727 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1728 struct ieee80211_local
*local
= sdata
->local
;
1729 struct ieee80211_tx_info
*info
;
1731 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1733 struct ieee80211_hdr hdr
;
1734 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1735 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1736 const u8
*encaps_data
;
1737 int encaps_len
, skip_header_bytes
;
1739 struct sta_info
*sta
= NULL
;
1740 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1741 bool tdls_direct
= false;
1745 struct ieee80211_chanctx_conf
*chanctx_conf
;
1746 struct ieee80211_sub_if_data
*ap_sdata
;
1747 enum ieee80211_band band
;
1749 if (unlikely(skb
->len
< ETH_HLEN
))
1752 /* convert Ethernet header to proper 802.11 header (based on
1753 * operation mode) */
1754 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1755 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1759 switch (sdata
->vif
.type
) {
1760 case NL80211_IFTYPE_AP_VLAN
:
1761 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1763 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1765 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1766 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1767 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1768 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1770 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1771 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1773 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1775 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1778 band
= chanctx_conf
->def
.chan
->band
;
1782 case NL80211_IFTYPE_AP
:
1783 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1784 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1787 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1789 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1790 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1791 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1793 band
= chanctx_conf
->def
.chan
->band
;
1795 case NL80211_IFTYPE_WDS
:
1796 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1798 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1799 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1800 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1801 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1804 * This is the exception! WDS style interfaces are prohibited
1805 * when channel contexts are in used so this must be valid
1807 band
= local
->hw
.conf
.chandef
.chan
->band
;
1809 #ifdef CONFIG_MAC80211_MESH
1810 case NL80211_IFTYPE_MESH_POINT
:
1811 if (!is_multicast_ether_addr(skb
->data
)) {
1812 struct sta_info
*next_hop
;
1813 bool mpp_lookup
= true;
1815 mpath
= mesh_path_lookup(sdata
, skb
->data
);
1818 next_hop
= rcu_dereference(mpath
->next_hop
);
1820 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
1821 MESH_PATH_RESOLVING
)))
1826 mppath
= mpp_path_lookup(sdata
, skb
->data
);
1828 if (mppath
&& mpath
)
1829 mesh_path_del(mpath
->sdata
, mpath
->dst
);
1833 * Use address extension if it is a packet from
1834 * another interface or if we know the destination
1835 * is being proxied by a portal (i.e. portal address
1836 * differs from proxied address)
1838 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1839 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1840 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1841 skb
->data
, skb
->data
+ ETH_ALEN
);
1842 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
1845 /* DS -> MBSS (802.11-2012 13.11.3.3).
1846 * For unicast with unknown forwarding information,
1847 * destination might be in the MBSS or if that fails
1848 * forwarded to another mesh gate. In either case
1849 * resolution will be handled in ieee80211_xmit(), so
1850 * leave the original DA. This also works for mcast */
1851 const u8
*mesh_da
= skb
->data
;
1854 mesh_da
= mppath
->mpp
;
1856 mesh_da
= mpath
->dst
;
1858 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1859 mesh_da
, sdata
->vif
.addr
);
1860 if (is_multicast_ether_addr(mesh_da
))
1861 /* DA TA mSA AE:SA */
1862 meshhdrlen
= ieee80211_new_mesh_header(
1864 skb
->data
+ ETH_ALEN
, NULL
);
1866 /* RA TA mDA mSA AE:DA SA */
1867 meshhdrlen
= ieee80211_new_mesh_header(
1868 sdata
, &mesh_hdr
, skb
->data
,
1869 skb
->data
+ ETH_ALEN
);
1872 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1875 band
= chanctx_conf
->def
.chan
->band
;
1878 case NL80211_IFTYPE_STATION
:
1879 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1880 bool tdls_peer
= false;
1882 sta
= sta_info_get(sdata
, skb
->data
);
1884 authorized
= test_sta_flag(sta
,
1885 WLAN_STA_AUTHORIZED
);
1886 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1887 tdls_peer
= test_sta_flag(sta
,
1888 WLAN_STA_TDLS_PEER
);
1889 tdls_auth
= test_sta_flag(sta
,
1890 WLAN_STA_TDLS_PEER_AUTH
);
1894 * If the TDLS link is enabled, send everything
1895 * directly. Otherwise, allow TDLS setup frames
1896 * to be transmitted indirectly.
1898 tdls_direct
= tdls_peer
&& (tdls_auth
||
1899 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1900 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1904 /* link during setup - throw out frames to peer */
1909 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1910 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1911 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1913 } else if (sdata
->u
.mgd
.use_4addr
&&
1914 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1915 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1916 IEEE80211_FCTL_TODS
);
1918 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1919 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1920 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1921 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1924 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1926 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1927 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1928 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1931 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1934 band
= chanctx_conf
->def
.chan
->band
;
1936 case NL80211_IFTYPE_ADHOC
:
1938 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1939 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1940 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1942 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1945 band
= chanctx_conf
->def
.chan
->band
;
1952 * There's no need to try to look up the destination
1953 * if it is a multicast address (which can only happen
1956 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1958 sta
= sta_info_get(sdata
, hdr
.addr1
);
1960 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1961 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1965 /* For mesh, the use of the QoS header is mandatory */
1966 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1969 /* receiver and we are QoS enabled, use a QoS type frame */
1970 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1971 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1976 * Drop unicast frames to unauthorised stations unless they are
1977 * EAPOL frames from the local station.
1979 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1980 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1981 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1982 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1983 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1984 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1985 dev
->name
, hdr
.addr1
);
1988 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1993 if (unlikely(!multicast
&& skb
->sk
&&
1994 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1995 struct sk_buff
*orig_skb
= skb
;
1997 skb
= skb_clone(skb
, GFP_ATOMIC
);
1999 unsigned long flags
;
2002 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2003 id
= idr_alloc(&local
->ack_status_frames
, orig_skb
,
2004 1, 0x10000, GFP_ATOMIC
);
2005 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2009 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2010 } else if (skb_shared(skb
)) {
2011 kfree_skb(orig_skb
);
2017 /* couldn't clone -- lose tx status ... */
2023 * If the skb is shared we need to obtain our own copy.
2025 if (skb_shared(skb
)) {
2026 struct sk_buff
*tmp_skb
= skb
;
2028 /* can't happen -- skb is a clone if info_id != 0 */
2031 skb
= skb_clone(skb
, GFP_ATOMIC
);
2038 hdr
.frame_control
= fc
;
2039 hdr
.duration_id
= 0;
2042 skip_header_bytes
= ETH_HLEN
;
2043 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2044 encaps_data
= bridge_tunnel_header
;
2045 encaps_len
= sizeof(bridge_tunnel_header
);
2046 skip_header_bytes
-= 2;
2047 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2048 encaps_data
= rfc1042_header
;
2049 encaps_len
= sizeof(rfc1042_header
);
2050 skip_header_bytes
-= 2;
2056 nh_pos
= skb_network_header(skb
) - skb
->data
;
2057 h_pos
= skb_transport_header(skb
) - skb
->data
;
2059 skb_pull(skb
, skip_header_bytes
);
2060 nh_pos
-= skip_header_bytes
;
2061 h_pos
-= skip_header_bytes
;
2063 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2066 * So we need to modify the skb header and hence need a copy of
2067 * that. The head_need variable above doesn't, so far, include
2068 * the needed header space that we don't need right away. If we
2069 * can, then we don't reallocate right now but only after the
2070 * frame arrives at the master device (if it does...)
2072 * If we cannot, however, then we will reallocate to include all
2073 * the ever needed space. Also, if we need to reallocate it anyway,
2074 * make it big enough for everything we may ever need.
2077 if (head_need
> 0 || skb_cloned(skb
)) {
2078 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2079 head_need
+= local
->tx_headroom
;
2080 head_need
= max_t(int, 0, head_need
);
2081 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2082 ieee80211_free_txskb(&local
->hw
, skb
);
2089 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2090 nh_pos
+= encaps_len
;
2091 h_pos
+= encaps_len
;
2094 #ifdef CONFIG_MAC80211_MESH
2095 if (meshhdrlen
> 0) {
2096 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2097 nh_pos
+= meshhdrlen
;
2098 h_pos
+= meshhdrlen
;
2102 if (ieee80211_is_data_qos(fc
)) {
2103 __le16
*qos_control
;
2105 qos_control
= (__le16
*) skb_push(skb
, 2);
2106 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2108 * Maybe we could actually set some fields here, for now just
2109 * initialise to zero to indicate no special operation.
2113 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2118 dev
->stats
.tx_packets
++;
2119 dev
->stats
.tx_bytes
+= skb
->len
;
2121 /* Update skb pointers to various headers since this modified frame
2122 * is going to go through Linux networking code that may potentially
2123 * need things like pointer to IP header. */
2124 skb_set_mac_header(skb
, 0);
2125 skb_set_network_header(skb
, nh_pos
);
2126 skb_set_transport_header(skb
, h_pos
);
2128 info
= IEEE80211_SKB_CB(skb
);
2129 memset(info
, 0, sizeof(*info
));
2131 dev
->trans_start
= jiffies
;
2133 info
->flags
= info_flags
;
2134 info
->ack_frame_id
= info_id
;
2136 ieee80211_xmit(sdata
, skb
, band
);
2139 return NETDEV_TX_OK
;
2145 return NETDEV_TX_OK
;
2150 * ieee80211_clear_tx_pending may not be called in a context where
2151 * it is possible that it packets could come in again.
2153 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2155 struct sk_buff
*skb
;
2158 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2159 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2160 ieee80211_free_txskb(&local
->hw
, skb
);
2165 * Returns false if the frame couldn't be transmitted but was queued instead,
2166 * which in this case means re-queued -- take as an indication to stop sending
2167 * more pending frames.
2169 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2170 struct sk_buff
*skb
)
2172 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2173 struct ieee80211_sub_if_data
*sdata
;
2174 struct sta_info
*sta
;
2175 struct ieee80211_hdr
*hdr
;
2177 struct ieee80211_chanctx_conf
*chanctx_conf
;
2179 sdata
= vif_to_sdata(info
->control
.vif
);
2181 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2182 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2183 if (unlikely(!chanctx_conf
)) {
2187 result
= ieee80211_tx(sdata
, skb
, true,
2188 chanctx_conf
->def
.chan
->band
);
2190 struct sk_buff_head skbs
;
2192 __skb_queue_head_init(&skbs
);
2193 __skb_queue_tail(&skbs
, skb
);
2195 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2196 sta
= sta_info_get(sdata
, hdr
->addr1
);
2198 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2205 * Transmit all pending packets. Called from tasklet.
2207 void ieee80211_tx_pending(unsigned long data
)
2209 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2210 unsigned long flags
;
2216 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2217 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2219 * If queue is stopped by something other than due to pending
2220 * frames, or we have no pending frames, proceed to next queue.
2222 if (local
->queue_stop_reasons
[i
] ||
2223 skb_queue_empty(&local
->pending
[i
]))
2226 while (!skb_queue_empty(&local
->pending
[i
])) {
2227 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2228 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2230 if (WARN_ON(!info
->control
.vif
)) {
2231 ieee80211_free_txskb(&local
->hw
, skb
);
2235 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2238 txok
= ieee80211_tx_pending_skb(local
, skb
);
2239 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2245 if (skb_queue_empty(&local
->pending
[i
]))
2246 ieee80211_propagate_queue_wake(local
, i
);
2248 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2253 /* functions for drivers to get certain frames */
2255 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2256 struct ps_data
*ps
, struct sk_buff
*skb
)
2260 int i
, have_bits
= 0, n1
, n2
;
2262 /* Generate bitmap for TIM only if there are any STAs in power save
2264 if (atomic_read(&ps
->num_sta_ps
) > 0)
2265 /* in the hope that this is faster than
2266 * checking byte-for-byte */
2267 have_bits
= !bitmap_empty((unsigned long*)ps
->tim
,
2268 IEEE80211_MAX_AID
+1);
2270 if (ps
->dtim_count
== 0)
2271 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2275 tim
= pos
= (u8
*) skb_put(skb
, 6);
2276 *pos
++ = WLAN_EID_TIM
;
2278 *pos
++ = ps
->dtim_count
;
2279 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2281 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2284 ps
->dtim_bc_mc
= aid0
== 1;
2287 /* Find largest even number N1 so that bits numbered 1 through
2288 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2289 * (N2 + 1) x 8 through 2007 are 0. */
2291 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2298 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2305 /* Bitmap control */
2307 /* Part Virt Bitmap */
2308 skb_put(skb
, n2
- n1
);
2309 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2311 tim
[1] = n2
- n1
+ 4;
2313 *pos
++ = aid0
; /* Bitmap control */
2314 *pos
++ = 0; /* Part Virt Bitmap */
2318 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2319 struct ps_data
*ps
, struct sk_buff
*skb
)
2321 struct ieee80211_local
*local
= sdata
->local
;
2324 * Not very nice, but we want to allow the driver to call
2325 * ieee80211_beacon_get() as a response to the set_tim()
2326 * callback. That, however, is already invoked under the
2327 * sta_lock to guarantee consistent and race-free update
2328 * of the tim bitmap in mac80211 and the driver.
2330 if (local
->tim_in_locked_section
) {
2331 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2333 spin_lock_bh(&local
->tim_lock
);
2334 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2335 spin_unlock_bh(&local
->tim_lock
);
2341 void ieee80211_csa_finish(struct ieee80211_vif
*vif
)
2343 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2345 ieee80211_queue_work(&sdata
->local
->hw
,
2346 &sdata
->csa_finalize_work
);
2348 EXPORT_SYMBOL(ieee80211_csa_finish
);
2350 static void ieee80211_update_csa(struct ieee80211_sub_if_data
*sdata
,
2351 struct beacon_data
*beacon
)
2353 struct probe_resp
*resp
;
2354 int counter_offset_beacon
= sdata
->csa_counter_offset_beacon
;
2355 int counter_offset_presp
= sdata
->csa_counter_offset_presp
;
2357 /* warn if the driver did not check for/react to csa completeness */
2358 if (WARN_ON(((u8
*)beacon
->tail
)[counter_offset_beacon
] == 0))
2361 ((u8
*)beacon
->tail
)[counter_offset_beacon
]--;
2363 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2364 counter_offset_presp
) {
2366 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
2368 /* if nl80211 accepted the offset, this should not happen. */
2369 if (WARN_ON(!resp
)) {
2373 resp
->data
[counter_offset_presp
]--;
2378 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
2380 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2381 struct beacon_data
*beacon
= NULL
;
2383 size_t beacon_data_len
;
2384 int counter_beacon
= sdata
->csa_counter_offset_beacon
;
2387 if (!ieee80211_sdata_running(sdata
))
2391 if (vif
->type
== NL80211_IFTYPE_AP
) {
2392 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2394 beacon
= rcu_dereference(ap
->beacon
);
2395 if (WARN_ON(!beacon
|| !beacon
->tail
))
2397 beacon_data
= beacon
->tail
;
2398 beacon_data_len
= beacon
->tail_len
;
2404 if (WARN_ON(counter_beacon
> beacon_data_len
))
2407 if (beacon_data
[counter_beacon
] == 0)
2414 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
2416 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2417 struct ieee80211_vif
*vif
,
2418 u16
*tim_offset
, u16
*tim_length
)
2420 struct ieee80211_local
*local
= hw_to_local(hw
);
2421 struct sk_buff
*skb
= NULL
;
2422 struct ieee80211_tx_info
*info
;
2423 struct ieee80211_sub_if_data
*sdata
= NULL
;
2424 enum ieee80211_band band
;
2425 struct ieee80211_tx_rate_control txrc
;
2426 struct ieee80211_chanctx_conf
*chanctx_conf
;
2430 sdata
= vif_to_sdata(vif
);
2431 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2433 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2441 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2442 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2443 struct beacon_data
*beacon
= rcu_dereference(ap
->beacon
);
2446 if (sdata
->vif
.csa_active
)
2447 ieee80211_update_csa(sdata
, beacon
);
2450 * headroom, head length,
2451 * tail length and maximum TIM length
2453 skb
= dev_alloc_skb(local
->tx_headroom
+
2455 beacon
->tail_len
+ 256);
2459 skb_reserve(skb
, local
->tx_headroom
);
2460 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2463 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
);
2466 *tim_offset
= beacon
->head_len
;
2468 *tim_length
= skb
->len
- beacon
->head_len
;
2471 memcpy(skb_put(skb
, beacon
->tail_len
),
2472 beacon
->tail
, beacon
->tail_len
);
2475 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2476 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2477 struct ieee80211_hdr
*hdr
;
2478 struct beacon_data
*presp
= rcu_dereference(ifibss
->presp
);
2483 skb
= dev_alloc_skb(local
->tx_headroom
+ presp
->head_len
);
2486 skb_reserve(skb
, local
->tx_headroom
);
2487 memcpy(skb_put(skb
, presp
->head_len
), presp
->head
,
2490 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2491 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2492 IEEE80211_STYPE_BEACON
);
2493 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2494 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2495 struct beacon_data
*bcn
= rcu_dereference(ifmsh
->beacon
);
2500 if (ifmsh
->sync_ops
)
2501 ifmsh
->sync_ops
->adjust_tbtt(
2504 skb
= dev_alloc_skb(local
->tx_headroom
+
2510 skb_reserve(skb
, local
->tx_headroom
);
2511 memcpy(skb_put(skb
, bcn
->head_len
), bcn
->head
, bcn
->head_len
);
2512 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
);
2513 memcpy(skb_put(skb
, bcn
->tail_len
), bcn
->tail
, bcn
->tail_len
);
2519 band
= chanctx_conf
->def
.chan
->band
;
2521 info
= IEEE80211_SKB_CB(skb
);
2523 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2524 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2527 memset(&txrc
, 0, sizeof(txrc
));
2529 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2530 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2532 txrc
.reported_rate
.idx
= -1;
2533 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2534 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2535 txrc
.max_rate_idx
= -1;
2537 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2539 rate_control_get_rate(sdata
, NULL
, &txrc
);
2541 info
->control
.vif
= vif
;
2543 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2544 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2545 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2550 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2552 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2553 struct ieee80211_vif
*vif
)
2555 struct ieee80211_if_ap
*ap
= NULL
;
2556 struct sk_buff
*skb
= NULL
;
2557 struct probe_resp
*presp
= NULL
;
2558 struct ieee80211_hdr
*hdr
;
2559 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2561 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2567 presp
= rcu_dereference(ap
->probe_resp
);
2571 skb
= dev_alloc_skb(presp
->len
);
2575 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2577 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2578 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2584 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2586 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2587 struct ieee80211_vif
*vif
)
2589 struct ieee80211_sub_if_data
*sdata
;
2590 struct ieee80211_if_managed
*ifmgd
;
2591 struct ieee80211_pspoll
*pspoll
;
2592 struct ieee80211_local
*local
;
2593 struct sk_buff
*skb
;
2595 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2598 sdata
= vif_to_sdata(vif
);
2599 ifmgd
= &sdata
->u
.mgd
;
2600 local
= sdata
->local
;
2602 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2606 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2608 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2609 memset(pspoll
, 0, sizeof(*pspoll
));
2610 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2611 IEEE80211_STYPE_PSPOLL
);
2612 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2614 /* aid in PS-Poll has its two MSBs each set to 1 */
2615 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2617 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2618 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2622 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2624 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2625 struct ieee80211_vif
*vif
)
2627 struct ieee80211_hdr_3addr
*nullfunc
;
2628 struct ieee80211_sub_if_data
*sdata
;
2629 struct ieee80211_if_managed
*ifmgd
;
2630 struct ieee80211_local
*local
;
2631 struct sk_buff
*skb
;
2633 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2636 sdata
= vif_to_sdata(vif
);
2637 ifmgd
= &sdata
->u
.mgd
;
2638 local
= sdata
->local
;
2640 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2644 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2646 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2648 memset(nullfunc
, 0, sizeof(*nullfunc
));
2649 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2650 IEEE80211_STYPE_NULLFUNC
|
2651 IEEE80211_FCTL_TODS
);
2652 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2653 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2654 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2658 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2660 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2661 struct ieee80211_vif
*vif
,
2662 const u8
*ssid
, size_t ssid_len
,
2665 struct ieee80211_sub_if_data
*sdata
;
2666 struct ieee80211_local
*local
;
2667 struct ieee80211_hdr_3addr
*hdr
;
2668 struct sk_buff
*skb
;
2672 sdata
= vif_to_sdata(vif
);
2673 local
= sdata
->local
;
2674 ie_ssid_len
= 2 + ssid_len
;
2676 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2677 ie_ssid_len
+ tailroom
);
2681 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2683 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2684 memset(hdr
, 0, sizeof(*hdr
));
2685 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2686 IEEE80211_STYPE_PROBE_REQ
);
2687 eth_broadcast_addr(hdr
->addr1
);
2688 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2689 eth_broadcast_addr(hdr
->addr3
);
2691 pos
= skb_put(skb
, ie_ssid_len
);
2692 *pos
++ = WLAN_EID_SSID
;
2695 memcpy(pos
, ssid
, ssid_len
);
2700 EXPORT_SYMBOL(ieee80211_probereq_get
);
2702 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2703 const void *frame
, size_t frame_len
,
2704 const struct ieee80211_tx_info
*frame_txctl
,
2705 struct ieee80211_rts
*rts
)
2707 const struct ieee80211_hdr
*hdr
= frame
;
2709 rts
->frame_control
=
2710 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2711 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2713 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2714 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2716 EXPORT_SYMBOL(ieee80211_rts_get
);
2718 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2719 const void *frame
, size_t frame_len
,
2720 const struct ieee80211_tx_info
*frame_txctl
,
2721 struct ieee80211_cts
*cts
)
2723 const struct ieee80211_hdr
*hdr
= frame
;
2725 cts
->frame_control
=
2726 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2727 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2728 frame_len
, frame_txctl
);
2729 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2731 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2734 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2735 struct ieee80211_vif
*vif
)
2737 struct ieee80211_local
*local
= hw_to_local(hw
);
2738 struct sk_buff
*skb
= NULL
;
2739 struct ieee80211_tx_data tx
;
2740 struct ieee80211_sub_if_data
*sdata
;
2742 struct ieee80211_tx_info
*info
;
2743 struct ieee80211_chanctx_conf
*chanctx_conf
;
2745 sdata
= vif_to_sdata(vif
);
2748 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2753 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2754 struct beacon_data
*beacon
=
2755 rcu_dereference(sdata
->u
.ap
.beacon
);
2757 if (!beacon
|| !beacon
->head
)
2760 ps
= &sdata
->u
.ap
.ps
;
2761 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2762 ps
= &sdata
->u
.mesh
.ps
;
2767 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
2768 goto out
; /* send buffered bc/mc only after DTIM beacon */
2771 skb
= skb_dequeue(&ps
->bc_buf
);
2774 local
->total_ps_buffered
--;
2776 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
2777 struct ieee80211_hdr
*hdr
=
2778 (struct ieee80211_hdr
*) skb
->data
;
2779 /* more buffered multicast/broadcast frames ==> set
2780 * MoreData flag in IEEE 802.11 header to inform PS
2782 hdr
->frame_control
|=
2783 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2786 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2787 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
2788 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2790 dev_kfree_skb_any(skb
);
2793 info
= IEEE80211_SKB_CB(skb
);
2795 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2796 info
->band
= chanctx_conf
->def
.chan
->band
;
2798 if (invoke_tx_handlers(&tx
))
2805 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2807 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
2808 struct sk_buff
*skb
, int tid
,
2809 enum ieee80211_band band
)
2811 int ac
= ieee802_1d_to_ac
[tid
& 7];
2813 skb_set_mac_header(skb
, 0);
2814 skb_set_network_header(skb
, 0);
2815 skb_set_transport_header(skb
, 0);
2817 skb_set_queue_mapping(skb
, ac
);
2818 skb
->priority
= tid
;
2820 skb
->dev
= sdata
->dev
;
2823 * The other path calling ieee80211_xmit is from the tasklet,
2824 * and while we can handle concurrent transmissions locking
2825 * requirements are that we do not come into tx with bhs on.
2828 ieee80211_xmit(sdata
, skb
, band
);