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 <linux/time.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
41 struct sk_buff
*skb
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
, shift
= 0;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
49 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 struct ieee80211_chanctx_conf
*chanctx_conf
;
54 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
56 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
57 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
61 /* assume HW handles this */
62 if (tx
->rate
.flags
& IEEE80211_TX_RC_MCS
)
66 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
69 sband
= local
->hw
.wiphy
->bands
[info
->band
];
70 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
72 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
75 * data and mgmt (except PS Poll):
77 * - during contention period:
78 * if addr1 is group address: 0
79 * if more fragments = 0 and addr1 is individual address: time to
80 * transmit one ACK plus SIFS
81 * if more fragments = 1 and addr1 is individual address: time to
82 * transmit next fragment plus 2 x ACK plus 3 x SIFS
85 * - control response frame (CTS or ACK) shall be transmitted using the
86 * same rate as the immediately previous frame in the frame exchange
87 * sequence, if this rate belongs to the PHY mandatory rates, or else
88 * at the highest possible rate belonging to the PHY rates in the
91 hdr
= (struct ieee80211_hdr
*)skb
->data
;
92 if (ieee80211_is_ctl(hdr
->frame_control
)) {
93 /* TODO: These control frames are not currently sent by
94 * mac80211, but should they be implemented, this function
95 * needs to be updated to support duration field calculation.
97 * RTS: time needed to transmit pending data/mgmt frame plus
98 * one CTS frame plus one ACK frame plus 3 x SIFS
99 * CTS: duration of immediately previous RTS minus time
100 * required to transmit CTS and its SIFS
101 * ACK: 0 if immediately previous directed data/mgmt had
102 * more=0, with more=1 duration in ACK frame is duration
103 * from previous frame minus time needed to transmit ACK
105 * PS Poll: BIT(15) | BIT(14) | aid
111 if (0 /* FIX: data/mgmt during CFP */)
112 return cpu_to_le16(32768);
114 if (group_addr
) /* Group address as the destination - no ACK */
117 /* Individual destination address:
118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
119 * CTS and ACK frames shall be transmitted using the highest rate in
120 * basic rate set that is less than or equal to the rate of the
121 * immediately previous frame and that is using the same modulation
122 * (CCK or OFDM). If no basic rate set matches with these requirements,
123 * the highest mandatory rate of the PHY that is less than or equal to
124 * the rate of the previous frame is used.
125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
128 /* use lowest available if everything fails */
129 mrate
= sband
->bitrates
[0].bitrate
;
130 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
131 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
133 if (r
->bitrate
> txrate
->bitrate
)
136 if ((rate_flags
& r
->flags
) != rate_flags
)
139 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
140 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
142 switch (sband
->band
) {
143 case IEEE80211_BAND_2GHZ
: {
145 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
146 flag
= IEEE80211_RATE_MANDATORY_G
;
148 flag
= IEEE80211_RATE_MANDATORY_B
;
153 case IEEE80211_BAND_5GHZ
:
154 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
157 case IEEE80211_BAND_60GHZ
:
158 /* TODO, for now fall through */
159 case IEEE80211_NUM_BANDS
:
165 /* No matching basic rate found; use highest suitable mandatory
167 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
170 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
171 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
172 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
175 /* Time needed to transmit ACK
176 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
177 * to closest integer */
178 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
179 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
183 /* Frame is fragmented: duration increases with time needed to
184 * transmit next fragment plus ACK and 2 x SIFS. */
185 dur
*= 2; /* ACK + SIFS */
187 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
188 txrate
->bitrate
, erp
,
189 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
193 return cpu_to_le16(dur
);
197 static ieee80211_tx_result debug_noinline
198 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
200 struct ieee80211_local
*local
= tx
->local
;
201 struct ieee80211_if_managed
*ifmgd
;
203 /* driver doesn't support power save */
204 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
207 /* hardware does dynamic power save */
208 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
211 /* dynamic power save disabled */
212 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
215 /* we are scanning, don't enable power save */
219 if (!local
->ps_sdata
)
222 /* No point if we're going to suspend */
223 if (local
->quiescing
)
226 /* dynamic ps is supported only in managed mode */
227 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
230 ifmgd
= &tx
->sdata
->u
.mgd
;
233 * Don't wakeup from power save if u-apsd is enabled, voip ac has
234 * u-apsd enabled and the frame is in voip class. This effectively
235 * means that even if all access categories have u-apsd enabled, in
236 * practise u-apsd is only used with the voip ac. This is a
237 * workaround for the case when received voip class packets do not
238 * have correct qos tag for some reason, due the network or the
241 * Note: ifmgd->uapsd_queues access is racy here. If the value is
242 * changed via debugfs, user needs to reassociate manually to have
243 * everything in sync.
245 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
246 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
247 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
250 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
251 ieee80211_stop_queues_by_reason(&local
->hw
,
252 IEEE80211_MAX_QUEUE_MAP
,
253 IEEE80211_QUEUE_STOP_REASON_PS
);
254 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
255 ieee80211_queue_work(&local
->hw
,
256 &local
->dynamic_ps_disable_work
);
259 /* Don't restart the timer if we're not disassociated */
260 if (!ifmgd
->associated
)
263 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
264 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
269 static ieee80211_tx_result debug_noinline
270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
273 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
274 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
277 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
280 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
281 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
282 !ieee80211_is_probe_req(hdr
->frame_control
) &&
283 !ieee80211_is_nullfunc(hdr
->frame_control
))
285 * When software scanning only nullfunc frames (to notify
286 * the sleep state to the AP) and probe requests (for the
287 * active scan) are allowed, all other frames should not be
288 * sent and we should not get here, but if we do
289 * nonetheless, drop them to avoid sending them
290 * off-channel. See the link below and
291 * ieee80211_start_scan() for more.
293 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
297 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
300 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
303 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
307 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
309 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
310 if (unlikely(!assoc
&&
311 ieee80211_is_data(hdr
->frame_control
))) {
312 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
313 sdata_info(tx
->sdata
,
314 "dropped data frame to not associated station %pM\n",
317 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
320 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
321 ieee80211_is_data(hdr
->frame_control
) &&
322 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
324 * No associated STAs - no need to send multicast
333 /* This function is called whenever the AP is about to exceed the maximum limit
334 * of buffered frames for power saving STAs. This situation should not really
335 * happen often during normal operation, so dropping the oldest buffered packet
336 * from each queue should be OK to make some room for new frames. */
337 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
339 int total
= 0, purged
= 0;
341 struct ieee80211_sub_if_data
*sdata
;
342 struct sta_info
*sta
;
344 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
347 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
348 ps
= &sdata
->u
.ap
.ps
;
349 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
350 ps
= &sdata
->u
.mesh
.ps
;
354 skb
= skb_dequeue(&ps
->bc_buf
);
359 total
+= skb_queue_len(&ps
->bc_buf
);
363 * Drop one frame from each station from the lowest-priority
364 * AC that has frames at all.
366 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
369 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
370 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
371 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
374 ieee80211_free_txskb(&local
->hw
, skb
);
380 local
->total_ps_buffered
= total
;
381 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
384 static ieee80211_tx_result
385 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
387 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
388 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
392 * broadcast/multicast frame
394 * If any of the associated/peer stations is in power save mode,
395 * the frame is buffered to be sent after DTIM beacon frame.
396 * This is done either by the hardware or us.
399 /* powersaving STAs currently only in AP/VLAN/mesh mode */
400 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
401 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
405 ps
= &tx
->sdata
->bss
->ps
;
406 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
407 ps
= &tx
->sdata
->u
.mesh
.ps
;
413 /* no buffering for ordered frames */
414 if (ieee80211_has_order(hdr
->frame_control
))
417 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
418 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
420 /* no stations in PS mode */
421 if (!atomic_read(&ps
->num_sta_ps
))
424 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
426 /* device releases frame after DTIM beacon */
427 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
430 /* buffered in mac80211 */
431 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
432 purge_old_ps_buffers(tx
->local
);
434 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
436 "BC TX buffer full - dropping the oldest frame\n");
437 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
439 tx
->local
->total_ps_buffered
++;
441 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
446 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
449 if (!ieee80211_is_mgmt(fc
))
452 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
455 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
462 static ieee80211_tx_result
463 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
465 struct sta_info
*sta
= tx
->sta
;
466 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
467 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
468 struct ieee80211_local
*local
= tx
->local
;
473 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
474 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
475 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
476 int ac
= skb_get_queue_mapping(tx
->skb
);
478 /* only deauth, disassoc and action are bufferable MMPDUs */
479 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
480 !ieee80211_is_deauth(hdr
->frame_control
) &&
481 !ieee80211_is_disassoc(hdr
->frame_control
) &&
482 !ieee80211_is_action(hdr
->frame_control
)) {
483 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
487 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
488 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
489 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
490 purge_old_ps_buffers(tx
->local
);
491 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
492 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
494 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
496 ieee80211_free_txskb(&local
->hw
, old
);
498 tx
->local
->total_ps_buffered
++;
500 info
->control
.jiffies
= jiffies
;
501 info
->control
.vif
= &tx
->sdata
->vif
;
502 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
503 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
505 if (!timer_pending(&local
->sta_cleanup
))
506 mod_timer(&local
->sta_cleanup
,
507 round_jiffies(jiffies
+
508 STA_INFO_CLEANUP_INTERVAL
));
511 * We queued up some frames, so the TIM bit might
512 * need to be set, recalculate it.
514 sta_info_recalc_tim(sta
);
517 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
519 "STA %pM in PS mode, but polling/in SP -> send frame\n",
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
529 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
532 if (tx
->flags
& IEEE80211_TX_UNICAST
)
533 return ieee80211_tx_h_unicast_ps_buf(tx
);
535 return ieee80211_tx_h_multicast_ps_buf(tx
);
538 static ieee80211_tx_result debug_noinline
539 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
541 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
543 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
544 if (tx
->sdata
->control_port_no_encrypt
)
545 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
546 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
552 static ieee80211_tx_result debug_noinline
553 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
555 struct ieee80211_key
*key
;
556 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
557 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
559 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
562 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
564 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
565 is_multicast_ether_addr(hdr
->addr1
) &&
566 ieee80211_is_robust_mgmt_frame(hdr
) &&
567 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
569 else if (is_multicast_ether_addr(hdr
->addr1
) &&
570 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
572 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
573 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
575 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
577 else if (!tx
->sdata
->drop_unencrypted
)
579 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
581 else if (ieee80211_is_robust_mgmt_frame(hdr
) &&
582 !(ieee80211_is_action(hdr
->frame_control
) &&
583 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
585 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
586 !ieee80211_is_robust_mgmt_frame(hdr
))
589 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
594 bool skip_hw
= false;
596 tx
->key
->tx_rx_count
++;
597 /* TODO: add threshold stuff again */
599 switch (tx
->key
->conf
.cipher
) {
600 case WLAN_CIPHER_SUITE_WEP40
:
601 case WLAN_CIPHER_SUITE_WEP104
:
602 case WLAN_CIPHER_SUITE_TKIP
:
603 if (!ieee80211_is_data_present(hdr
->frame_control
))
606 case WLAN_CIPHER_SUITE_CCMP
:
607 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
608 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
612 skip_hw
= (tx
->key
->conf
.flags
&
613 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
614 ieee80211_is_mgmt(hdr
->frame_control
);
616 case WLAN_CIPHER_SUITE_AES_CMAC
:
617 if (!ieee80211_is_mgmt(hdr
->frame_control
))
622 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
623 !ieee80211_is_deauth(hdr
->frame_control
)))
626 if (!skip_hw
&& tx
->key
&&
627 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
628 info
->control
.hw_key
= &tx
->key
->conf
;
634 static ieee80211_tx_result debug_noinline
635 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
637 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
638 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
639 struct ieee80211_supported_band
*sband
;
641 struct ieee80211_tx_rate_control txrc
;
642 struct ieee80211_sta_rates
*ratetbl
= NULL
;
645 memset(&txrc
, 0, sizeof(txrc
));
647 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
649 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
650 tx
->local
->hw
.wiphy
->frag_threshold
);
652 /* set up the tx rate control struct we give the RC algo */
653 txrc
.hw
= &tx
->local
->hw
;
655 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
657 txrc
.reported_rate
.idx
= -1;
658 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
659 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
660 txrc
.max_rate_idx
= -1;
662 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
664 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
665 txrc
.rate_idx_mcs_mask
=
666 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
668 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
669 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
670 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
672 /* set up RTS protection if desired */
673 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
677 info
->control
.use_rts
= txrc
.rts
;
678 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
681 * Use short preamble if the BSS can handle it, but not for
682 * management frames unless we know the receiver can handle
683 * that -- the management frame might be to a station that
684 * just wants a probe response.
686 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
687 (ieee80211_is_data(hdr
->frame_control
) ||
688 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
689 txrc
.short_preamble
= true;
691 info
->control
.short_preamble
= txrc
.short_preamble
;
694 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
697 * Lets not bother rate control if we're associated and cannot
698 * talk to the sta. This should not happen.
700 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
701 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
702 "%s: Dropped data frame as no usable bitrate found while "
703 "scanning and associated. Target station: "
704 "%pM on %d GHz band\n",
705 tx
->sdata
->name
, hdr
->addr1
,
710 * If we're associated with the sta at this point we know we can at
711 * least send the frame at the lowest bit rate.
713 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
715 if (tx
->sta
&& !info
->control
.skip_table
)
716 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
718 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
720 struct ieee80211_tx_rate rate
= {
721 .idx
= ratetbl
->rate
[0].idx
,
722 .flags
= ratetbl
->rate
[0].flags
,
723 .count
= ratetbl
->rate
[0].count
726 if (ratetbl
->rate
[0].idx
< 0)
734 tx
->rate
= info
->control
.rates
[0];
737 if (txrc
.reported_rate
.idx
< 0) {
738 txrc
.reported_rate
= tx
->rate
;
739 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
740 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
742 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
747 if (unlikely(!info
->control
.rates
[0].count
))
748 info
->control
.rates
[0].count
= 1;
750 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
751 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
752 info
->control
.rates
[0].count
= 1;
757 static ieee80211_tx_result debug_noinline
758 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
760 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
761 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
767 * Packet injection may want to control the sequence
768 * number, if we have no matching interface then we
769 * neither assign one ourselves nor ask the driver to.
771 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
774 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
777 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
780 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
784 * Anything but QoS data that has a sequence number field
785 * (is long enough) gets a sequence number from the global
786 * counter. QoS data frames with a multicast destination
787 * also use the global counter (802.11-2012 9.3.2.10).
789 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
790 is_multicast_ether_addr(hdr
->addr1
)) {
791 /* driver should assign sequence number */
792 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
793 /* for pure STA mode without beacons, we can do it */
794 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
795 tx
->sdata
->sequence_number
+= 0x10;
800 * This should be true for injected/management frames only, for
801 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
802 * above since they are not QoS-data frames.
807 /* include per-STA, per-TID sequence counter */
809 qc
= ieee80211_get_qos_ctl(hdr
);
810 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
811 seq
= &tx
->sta
->tid_seq
[tid
];
813 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
815 /* Increase the sequence number. */
816 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
821 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
822 struct sk_buff
*skb
, int hdrlen
,
825 struct ieee80211_local
*local
= tx
->local
;
826 struct ieee80211_tx_info
*info
;
828 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
829 int pos
= hdrlen
+ per_fragm
;
830 int rem
= skb
->len
- hdrlen
- per_fragm
;
832 if (WARN_ON(rem
< 0))
835 /* first fragment was already added to queue by caller */
838 int fraglen
= per_fragm
;
843 tmp
= dev_alloc_skb(local
->tx_headroom
+
845 tx
->sdata
->encrypt_headroom
+
846 IEEE80211_ENCRYPT_TAILROOM
);
850 __skb_queue_tail(&tx
->skbs
, tmp
);
853 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
855 /* copy control information */
856 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
858 info
= IEEE80211_SKB_CB(tmp
);
859 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
860 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
863 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
865 skb_copy_queue_mapping(tmp
, skb
);
866 tmp
->priority
= skb
->priority
;
869 /* copy header and data */
870 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
871 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
876 /* adjust first fragment's length */
877 skb
->len
= hdrlen
+ per_fragm
;
881 static ieee80211_tx_result debug_noinline
882 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
884 struct sk_buff
*skb
= tx
->skb
;
885 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
886 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
887 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
891 /* no matter what happens, tx->skb moves to tx->skbs */
892 __skb_queue_tail(&tx
->skbs
, skb
);
895 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
898 if (tx
->local
->ops
->set_frag_threshold
)
902 * Warn when submitting a fragmented A-MPDU frame and drop it.
903 * This scenario is handled in ieee80211_tx_prepare but extra
904 * caution taken here as fragmented ampdu may cause Tx stop.
906 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
909 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
911 /* internal error, why isn't DONTFRAG set? */
912 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
916 * Now fragment the frame. This will allocate all the fragments and
917 * chain them (using skb as the first fragment) to skb->next.
918 * During transmission, we will remove the successfully transmitted
919 * fragments from this list. When the low-level driver rejects one
920 * of the fragments then we will simply pretend to accept the skb
921 * but store it away as pending.
923 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
926 /* update duration/seq/flags of fragments */
929 skb_queue_walk(&tx
->skbs
, skb
) {
930 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
932 hdr
= (void *)skb
->data
;
933 info
= IEEE80211_SKB_CB(skb
);
935 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
936 hdr
->frame_control
|= morefrags
;
938 * No multi-rate retries for fragmented frames, that
939 * would completely throw off the NAV at other STAs.
941 info
->control
.rates
[1].idx
= -1;
942 info
->control
.rates
[2].idx
= -1;
943 info
->control
.rates
[3].idx
= -1;
944 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
945 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
947 hdr
->frame_control
&= ~morefrags
;
949 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
956 static ieee80211_tx_result debug_noinline
957 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
965 skb_queue_walk(&tx
->skbs
, skb
) {
966 ac
= skb_get_queue_mapping(skb
);
967 tx
->sta
->tx_fragments
++;
968 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
971 tx
->sta
->tx_packets
[ac
]++;
976 static ieee80211_tx_result debug_noinline
977 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
982 switch (tx
->key
->conf
.cipher
) {
983 case WLAN_CIPHER_SUITE_WEP40
:
984 case WLAN_CIPHER_SUITE_WEP104
:
985 return ieee80211_crypto_wep_encrypt(tx
);
986 case WLAN_CIPHER_SUITE_TKIP
:
987 return ieee80211_crypto_tkip_encrypt(tx
);
988 case WLAN_CIPHER_SUITE_CCMP
:
989 return ieee80211_crypto_ccmp_encrypt(tx
);
990 case WLAN_CIPHER_SUITE_AES_CMAC
:
991 return ieee80211_crypto_aes_cmac_encrypt(tx
);
993 return ieee80211_crypto_hw_encrypt(tx
);
999 static ieee80211_tx_result debug_noinline
1000 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1002 struct sk_buff
*skb
;
1003 struct ieee80211_hdr
*hdr
;
1007 skb_queue_walk(&tx
->skbs
, skb
) {
1008 hdr
= (void *) skb
->data
;
1009 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1010 break; /* must not overwrite AID */
1011 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1012 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1013 next_len
= next
->len
;
1016 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1019 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1025 /* actual transmit path */
1027 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1028 struct sk_buff
*skb
,
1029 struct ieee80211_tx_info
*info
,
1030 struct tid_ampdu_tx
*tid_tx
,
1033 bool queued
= false;
1034 bool reset_agg_timer
= false;
1035 struct sk_buff
*purge_skb
= NULL
;
1037 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1038 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1039 reset_agg_timer
= true;
1040 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1042 * nothing -- this aggregation session is being started
1043 * but that might still fail with the driver
1046 spin_lock(&tx
->sta
->lock
);
1048 * Need to re-check now, because we may get here
1050 * 1) in the window during which the setup is actually
1051 * already done, but not marked yet because not all
1052 * packets are spliced over to the driver pending
1053 * queue yet -- if this happened we acquire the lock
1054 * either before or after the splice happens, but
1055 * need to recheck which of these cases happened.
1057 * 2) during session teardown, if the OPERATIONAL bit
1058 * was cleared due to the teardown but the pointer
1059 * hasn't been assigned NULL yet (or we loaded it
1060 * before it was assigned) -- in this case it may
1061 * now be NULL which means we should just let the
1062 * packet pass through because splicing the frames
1063 * back is already done.
1065 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1068 /* do nothing, let packet pass through */
1069 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1070 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1071 reset_agg_timer
= true;
1074 info
->control
.vif
= &tx
->sdata
->vif
;
1075 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1076 __skb_queue_tail(&tid_tx
->pending
, skb
);
1077 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1078 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1080 spin_unlock(&tx
->sta
->lock
);
1083 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1086 /* reset session timer */
1087 if (reset_agg_timer
&& tid_tx
->timeout
)
1088 tid_tx
->last_tx
= jiffies
;
1096 static ieee80211_tx_result
1097 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1098 struct ieee80211_tx_data
*tx
,
1099 struct sk_buff
*skb
)
1101 struct ieee80211_local
*local
= sdata
->local
;
1102 struct ieee80211_hdr
*hdr
;
1103 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1107 memset(tx
, 0, sizeof(*tx
));
1111 __skb_queue_head_init(&tx
->skbs
);
1114 * If this flag is set to true anywhere, and we get here,
1115 * we are doing the needed processing, so remove the flag
1118 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1120 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1122 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1123 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1124 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1126 } else if (info
->flags
& (IEEE80211_TX_CTL_INJECTED
|
1127 IEEE80211_TX_INTFL_NL80211_FRAME_TX
) ||
1128 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1129 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1132 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1134 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1135 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1136 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1137 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1138 struct tid_ampdu_tx
*tid_tx
;
1140 qc
= ieee80211_get_qos_ctl(hdr
);
1141 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1143 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1147 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1150 if (unlikely(queued
))
1155 if (is_multicast_ether_addr(hdr
->addr1
)) {
1156 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1157 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1159 tx
->flags
|= IEEE80211_TX_UNICAST
;
1161 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1162 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1163 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1164 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1165 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1169 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1170 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1171 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1173 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1178 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1179 struct ieee80211_vif
*vif
,
1180 struct ieee80211_sta
*sta
,
1181 struct sk_buff_head
*skbs
,
1184 struct ieee80211_tx_control control
;
1185 struct sk_buff
*skb
, *tmp
;
1186 unsigned long flags
;
1188 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1189 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1190 int q
= info
->hw_queue
;
1192 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1193 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1194 __skb_unlink(skb
, skbs
);
1195 ieee80211_free_txskb(&local
->hw
, skb
);
1200 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1201 if (local
->queue_stop_reasons
[q
] ||
1202 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1203 if (unlikely(info
->flags
&
1204 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1205 if (local
->queue_stop_reasons
[q
] &
1206 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1208 * Drop off-channel frames if queues
1209 * are stopped for any reason other
1210 * than off-channel operation. Never
1213 spin_unlock_irqrestore(
1214 &local
->queue_stop_reason_lock
,
1216 ieee80211_purge_tx_queue(&local
->hw
,
1223 * Since queue is stopped, queue up frames for
1224 * later transmission from the tx-pending
1225 * tasklet when the queue is woken again.
1228 skb_queue_splice_init(skbs
,
1229 &local
->pending
[q
]);
1231 skb_queue_splice_tail_init(skbs
,
1232 &local
->pending
[q
]);
1234 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1239 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1241 info
->control
.vif
= vif
;
1244 __skb_unlink(skb
, skbs
);
1245 drv_tx(local
, &control
, skb
);
1252 * Returns false if the frame couldn't be transmitted but was queued instead.
1254 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1255 struct sk_buff_head
*skbs
, int led_len
,
1256 struct sta_info
*sta
, bool txpending
)
1258 struct ieee80211_tx_info
*info
;
1259 struct ieee80211_sub_if_data
*sdata
;
1260 struct ieee80211_vif
*vif
;
1261 struct ieee80211_sta
*pubsta
;
1262 struct sk_buff
*skb
;
1266 if (WARN_ON(skb_queue_empty(skbs
)))
1269 skb
= skb_peek(skbs
);
1270 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1271 info
= IEEE80211_SKB_CB(skb
);
1272 sdata
= vif_to_sdata(info
->control
.vif
);
1273 if (sta
&& !sta
->uploaded
)
1281 switch (sdata
->vif
.type
) {
1282 case NL80211_IFTYPE_MONITOR
:
1283 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
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
);
1312 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1318 * Invoke TX handlers, return 0 on success and non-zero if the
1319 * frame was dropped or queued.
1321 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1323 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1324 ieee80211_tx_result res
= TX_DROP
;
1326 #define CALL_TXH(txh) \
1329 if (res != TX_CONTINUE) \
1333 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1334 CALL_TXH(ieee80211_tx_h_check_assoc
);
1335 CALL_TXH(ieee80211_tx_h_ps_buf
);
1336 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1337 CALL_TXH(ieee80211_tx_h_select_key
);
1338 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1339 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1341 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1342 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1347 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1348 CALL_TXH(ieee80211_tx_h_sequence
);
1349 CALL_TXH(ieee80211_tx_h_fragment
);
1350 /* handlers after fragment must be aware of tx info fragmentation! */
1351 CALL_TXH(ieee80211_tx_h_stats
);
1352 CALL_TXH(ieee80211_tx_h_encrypt
);
1353 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1354 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1358 if (unlikely(res
== TX_DROP
)) {
1359 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1361 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1363 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1365 } else if (unlikely(res
== TX_QUEUED
)) {
1366 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1373 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1374 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1375 int band
, struct ieee80211_sta
**sta
)
1377 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1378 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1379 struct ieee80211_tx_data tx
;
1381 if (ieee80211_tx_prepare(sdata
, &tx
, skb
) == TX_DROP
)
1385 info
->control
.vif
= vif
;
1386 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1388 if (invoke_tx_handlers(&tx
))
1393 *sta
= &tx
.sta
->sta
;
1400 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1403 * Returns false if the frame couldn't be transmitted but was queued instead.
1405 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1406 struct sk_buff
*skb
, bool txpending
,
1407 enum ieee80211_band band
)
1409 struct ieee80211_local
*local
= sdata
->local
;
1410 struct ieee80211_tx_data tx
;
1411 ieee80211_tx_result res_prepare
;
1412 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1416 if (unlikely(skb
->len
< 10)) {
1421 /* initialises tx */
1423 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1425 if (unlikely(res_prepare
== TX_DROP
)) {
1426 ieee80211_free_txskb(&local
->hw
, skb
);
1428 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1434 /* set up hw_queue value early */
1435 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1436 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1438 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1440 if (!invoke_tx_handlers(&tx
))
1441 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1447 /* device xmit handlers */
1449 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1450 struct sk_buff
*skb
,
1451 int head_need
, bool may_encrypt
)
1453 struct ieee80211_local
*local
= sdata
->local
;
1456 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1457 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1458 tail_need
-= skb_tailroom(skb
);
1459 tail_need
= max_t(int, tail_need
, 0);
1462 if (skb_cloned(skb
))
1463 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1464 else if (head_need
|| tail_need
)
1465 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1469 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1470 wiphy_debug(local
->hw
.wiphy
,
1471 "failed to reallocate TX buffer\n");
1478 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
,
1479 enum ieee80211_band band
)
1481 struct ieee80211_local
*local
= sdata
->local
;
1482 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1483 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1487 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1489 headroom
= local
->tx_headroom
;
1491 headroom
+= sdata
->encrypt_headroom
;
1492 headroom
-= skb_headroom(skb
);
1493 headroom
= max_t(int, 0, headroom
);
1495 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1496 ieee80211_free_txskb(&local
->hw
, skb
);
1500 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1501 info
->control
.vif
= &sdata
->vif
;
1503 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1504 if (ieee80211_is_data(hdr
->frame_control
) &&
1505 is_unicast_ether_addr(hdr
->addr1
)) {
1506 if (mesh_nexthop_resolve(sdata
, skb
))
1507 return; /* skb queued: don't free */
1509 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1513 ieee80211_set_qos_hdr(sdata
, skb
);
1514 ieee80211_tx(sdata
, skb
, false, band
);
1517 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1519 struct ieee80211_radiotap_iterator iterator
;
1520 struct ieee80211_radiotap_header
*rthdr
=
1521 (struct ieee80211_radiotap_header
*) skb
->data
;
1522 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1523 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1527 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1528 IEEE80211_TX_CTL_DONTFRAG
;
1531 * for every radiotap entry that is present
1532 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1533 * entries present, or -EINVAL on error)
1537 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1542 /* see if this argument is something we can use */
1543 switch (iterator
.this_arg_index
) {
1545 * You must take care when dereferencing iterator.this_arg
1546 * for multibyte types... the pointer is not aligned. Use
1547 * get_unaligned((type *)iterator.this_arg) to dereference
1548 * iterator.this_arg for type "type" safely on all arches.
1550 case IEEE80211_RADIOTAP_FLAGS
:
1551 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1553 * this indicates that the skb we have been
1554 * handed has the 32-bit FCS CRC at the end...
1555 * we should react to that by snipping it off
1556 * because it will be recomputed and added
1559 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1562 skb_trim(skb
, skb
->len
- FCS_LEN
);
1564 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1565 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1566 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1567 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1570 case IEEE80211_RADIOTAP_TX_FLAGS
:
1571 txflags
= get_unaligned_le16(iterator
.this_arg
);
1572 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1573 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1577 * Please update the file
1578 * Documentation/networking/mac80211-injection.txt
1579 * when parsing new fields here.
1587 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1591 * remove the radiotap header
1592 * iterator->_max_length was sanity-checked against
1593 * skb->len by iterator init
1595 skb_pull(skb
, iterator
._max_length
);
1600 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1601 struct net_device
*dev
)
1603 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1604 struct ieee80211_chanctx_conf
*chanctx_conf
;
1605 struct ieee80211_channel
*chan
;
1606 struct ieee80211_radiotap_header
*prthdr
=
1607 (struct ieee80211_radiotap_header
*)skb
->data
;
1608 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1609 struct ieee80211_hdr
*hdr
;
1610 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1614 /* check for not even having the fixed radiotap header part */
1615 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1616 goto fail
; /* too short to be possibly valid */
1618 /* is it a header version we can trust to find length from? */
1619 if (unlikely(prthdr
->it_version
))
1620 goto fail
; /* only version 0 is supported */
1622 /* then there must be a radiotap header with a length we can use */
1623 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1625 /* does the skb contain enough to deliver on the alleged length? */
1626 if (unlikely(skb
->len
< len_rthdr
))
1627 goto fail
; /* skb too short for claimed rt header extent */
1630 * fix up the pointers accounting for the radiotap
1631 * header still being in there. We are being given
1632 * a precooked IEEE80211 header so no need for
1635 skb_set_mac_header(skb
, len_rthdr
);
1637 * these are just fixed to the end of the rt area since we
1638 * don't have any better information and at this point, nobody cares
1640 skb_set_network_header(skb
, len_rthdr
);
1641 skb_set_transport_header(skb
, len_rthdr
);
1643 if (skb
->len
< len_rthdr
+ 2)
1646 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1647 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1649 if (skb
->len
< len_rthdr
+ hdrlen
)
1653 * Initialize skb->protocol if the injected frame is a data frame
1654 * carrying a rfc1042 header
1656 if (ieee80211_is_data(hdr
->frame_control
) &&
1657 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1658 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1660 if (ether_addr_equal(payload
, rfc1042_header
))
1661 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1665 memset(info
, 0, sizeof(*info
));
1667 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1668 IEEE80211_TX_CTL_INJECTED
;
1670 /* process and remove the injection radiotap header */
1671 if (!ieee80211_parse_tx_radiotap(skb
))
1677 * We process outgoing injected frames that have a local address
1678 * we handle as though they are non-injected frames.
1679 * This code here isn't entirely correct, the local MAC address
1680 * isn't always enough to find the interface to use; for proper
1681 * VLAN/WDS support we will need a different mechanism (which
1682 * likely isn't going to be monitor interfaces).
1684 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1686 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1687 if (!ieee80211_sdata_running(tmp_sdata
))
1689 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1690 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1691 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1693 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1699 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1700 if (!chanctx_conf
) {
1701 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1704 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1708 chan
= chanctx_conf
->def
.chan
;
1709 else if (!local
->use_chanctx
)
1710 chan
= local
->_oper_chandef
.chan
;
1715 * Frame injection is not allowed if beaconing is not allowed
1716 * or if we need radar detection. Beaconing is usually not allowed when
1717 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1718 * Passive scan is also used in world regulatory domains where
1719 * your country is not known and as such it should be treated as
1720 * NO TX unless the channel is explicitly allowed in which case
1721 * your current regulatory domain would not have the passive scan
1724 * Since AP mode uses monitor interfaces to inject/TX management
1725 * frames we can make AP mode the exception to this rule once it
1726 * supports radar detection as its implementation can deal with
1727 * radar detection by itself. We can do that later by adding a
1728 * monitor flag interfaces used for AP support.
1730 if ((chan
->flags
& (IEEE80211_CHAN_NO_IR
| IEEE80211_CHAN_RADAR
)))
1733 ieee80211_xmit(sdata
, skb
, chan
->band
);
1736 return NETDEV_TX_OK
;
1742 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1746 * Measure Tx frame arrival time for Tx latency statistics calculation
1747 * A single Tx frame latency should be measured from when it is entering the
1748 * Kernel until we receive Tx complete confirmation indication and the skb is
1751 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local
*local
,
1752 struct sk_buff
*skb
)
1754 struct timespec skb_arv
;
1755 struct ieee80211_tx_latency_bin_ranges
*tx_latency
;
1757 tx_latency
= rcu_dereference(local
->tx_latency
);
1761 ktime_get_ts(&skb_arv
);
1762 skb
->tstamp
= ktime_set(skb_arv
.tv_sec
, skb_arv
.tv_nsec
);
1766 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1767 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1768 * @skb: packet to be sent
1769 * @dev: incoming interface
1771 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1772 * not be freed, and caller is responsible for either retrying later or freeing
1775 * This function takes in an Ethernet header and encapsulates it with suitable
1776 * IEEE 802.11 header based on which interface the packet is coming in. The
1777 * encapsulated packet will then be passed to master interface, wlan#.11, for
1778 * transmission (through low-level driver).
1780 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1781 struct net_device
*dev
)
1783 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1784 struct ieee80211_local
*local
= sdata
->local
;
1785 struct ieee80211_tx_info
*info
;
1787 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1789 struct ieee80211_hdr hdr
;
1790 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1791 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1792 const u8
*encaps_data
;
1793 int encaps_len
, skip_header_bytes
;
1795 struct sta_info
*sta
= NULL
;
1796 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1797 bool tdls_direct
= false;
1801 struct ieee80211_chanctx_conf
*chanctx_conf
;
1802 struct ieee80211_sub_if_data
*ap_sdata
;
1803 enum ieee80211_band band
;
1805 if (unlikely(skb
->len
< ETH_HLEN
))
1808 /* convert Ethernet header to proper 802.11 header (based on
1809 * operation mode) */
1810 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1811 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1815 /* Measure frame arrival for Tx latency statistics calculation */
1816 ieee80211_tx_latency_start_msrmnt(local
, skb
);
1818 switch (sdata
->vif
.type
) {
1819 case NL80211_IFTYPE_AP_VLAN
:
1820 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1822 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1824 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1825 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1826 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1827 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1829 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1830 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1832 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1834 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1837 band
= chanctx_conf
->def
.chan
->band
;
1841 case NL80211_IFTYPE_AP
:
1842 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1843 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1846 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1848 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1849 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1850 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1852 band
= chanctx_conf
->def
.chan
->band
;
1854 case NL80211_IFTYPE_WDS
:
1855 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1857 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1858 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1859 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1860 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1863 * This is the exception! WDS style interfaces are prohibited
1864 * when channel contexts are in used so this must be valid
1866 band
= local
->hw
.conf
.chandef
.chan
->band
;
1868 #ifdef CONFIG_MAC80211_MESH
1869 case NL80211_IFTYPE_MESH_POINT
:
1870 if (!is_multicast_ether_addr(skb
->data
)) {
1871 struct sta_info
*next_hop
;
1872 bool mpp_lookup
= true;
1874 mpath
= mesh_path_lookup(sdata
, skb
->data
);
1877 next_hop
= rcu_dereference(mpath
->next_hop
);
1879 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
1880 MESH_PATH_RESOLVING
)))
1885 mppath
= mpp_path_lookup(sdata
, skb
->data
);
1887 if (mppath
&& mpath
)
1888 mesh_path_del(mpath
->sdata
, mpath
->dst
);
1892 * Use address extension if it is a packet from
1893 * another interface or if we know the destination
1894 * is being proxied by a portal (i.e. portal address
1895 * differs from proxied address)
1897 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1898 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1899 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1900 skb
->data
, skb
->data
+ ETH_ALEN
);
1901 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
1904 /* DS -> MBSS (802.11-2012 13.11.3.3).
1905 * For unicast with unknown forwarding information,
1906 * destination might be in the MBSS or if that fails
1907 * forwarded to another mesh gate. In either case
1908 * resolution will be handled in ieee80211_xmit(), so
1909 * leave the original DA. This also works for mcast */
1910 const u8
*mesh_da
= skb
->data
;
1913 mesh_da
= mppath
->mpp
;
1915 mesh_da
= mpath
->dst
;
1917 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1918 mesh_da
, sdata
->vif
.addr
);
1919 if (is_multicast_ether_addr(mesh_da
))
1920 /* DA TA mSA AE:SA */
1921 meshhdrlen
= ieee80211_new_mesh_header(
1923 skb
->data
+ ETH_ALEN
, NULL
);
1925 /* RA TA mDA mSA AE:DA SA */
1926 meshhdrlen
= ieee80211_new_mesh_header(
1927 sdata
, &mesh_hdr
, skb
->data
,
1928 skb
->data
+ ETH_ALEN
);
1931 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1934 band
= chanctx_conf
->def
.chan
->band
;
1937 case NL80211_IFTYPE_STATION
:
1938 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1939 bool tdls_peer
= false;
1941 sta
= sta_info_get(sdata
, skb
->data
);
1943 authorized
= test_sta_flag(sta
,
1944 WLAN_STA_AUTHORIZED
);
1945 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1946 tdls_peer
= test_sta_flag(sta
,
1947 WLAN_STA_TDLS_PEER
);
1948 tdls_auth
= test_sta_flag(sta
,
1949 WLAN_STA_TDLS_PEER_AUTH
);
1953 * If the TDLS link is enabled, send everything
1954 * directly. Otherwise, allow TDLS setup frames
1955 * to be transmitted indirectly.
1957 tdls_direct
= tdls_peer
&& (tdls_auth
||
1958 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1959 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1963 /* link during setup - throw out frames to peer */
1968 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1969 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1970 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1972 } else if (sdata
->u
.mgd
.use_4addr
&&
1973 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1974 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1975 IEEE80211_FCTL_TODS
);
1977 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1978 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1979 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1980 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1983 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1985 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1986 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1987 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1990 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1993 band
= chanctx_conf
->def
.chan
->band
;
1995 case NL80211_IFTYPE_ADHOC
:
1997 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1998 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1999 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2001 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2004 band
= chanctx_conf
->def
.chan
->band
;
2011 * There's no need to try to look up the destination
2012 * if it is a multicast address (which can only happen
2015 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2017 sta
= sta_info_get(sdata
, hdr
.addr1
);
2019 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2020 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
2024 /* For mesh, the use of the QoS header is mandatory */
2025 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2028 /* receiver and we are QoS enabled, use a QoS type frame */
2029 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
2030 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2035 * Drop unicast frames to unauthorised stations unless they are
2036 * EAPOL frames from the local station.
2038 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2039 !multicast
&& !authorized
&&
2040 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2041 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2042 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2043 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2044 dev
->name
, hdr
.addr1
);
2047 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2052 if (unlikely(!multicast
&& skb
->sk
&&
2053 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2054 struct sk_buff
*orig_skb
= skb
;
2056 skb
= skb_clone(skb
, GFP_ATOMIC
);
2058 unsigned long flags
;
2061 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2062 id
= idr_alloc(&local
->ack_status_frames
, orig_skb
,
2063 1, 0x10000, GFP_ATOMIC
);
2064 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2068 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2069 } else if (skb_shared(skb
)) {
2070 kfree_skb(orig_skb
);
2076 /* couldn't clone -- lose tx status ... */
2082 * If the skb is shared we need to obtain our own copy.
2084 if (skb_shared(skb
)) {
2085 struct sk_buff
*tmp_skb
= skb
;
2087 /* can't happen -- skb is a clone if info_id != 0 */
2090 skb
= skb_clone(skb
, GFP_ATOMIC
);
2097 hdr
.frame_control
= fc
;
2098 hdr
.duration_id
= 0;
2101 skip_header_bytes
= ETH_HLEN
;
2102 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2103 encaps_data
= bridge_tunnel_header
;
2104 encaps_len
= sizeof(bridge_tunnel_header
);
2105 skip_header_bytes
-= 2;
2106 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2107 encaps_data
= rfc1042_header
;
2108 encaps_len
= sizeof(rfc1042_header
);
2109 skip_header_bytes
-= 2;
2115 nh_pos
= skb_network_header(skb
) - skb
->data
;
2116 h_pos
= skb_transport_header(skb
) - skb
->data
;
2118 skb_pull(skb
, skip_header_bytes
);
2119 nh_pos
-= skip_header_bytes
;
2120 h_pos
-= skip_header_bytes
;
2122 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2125 * So we need to modify the skb header and hence need a copy of
2126 * that. The head_need variable above doesn't, so far, include
2127 * the needed header space that we don't need right away. If we
2128 * can, then we don't reallocate right now but only after the
2129 * frame arrives at the master device (if it does...)
2131 * If we cannot, however, then we will reallocate to include all
2132 * the ever needed space. Also, if we need to reallocate it anyway,
2133 * make it big enough for everything we may ever need.
2136 if (head_need
> 0 || skb_cloned(skb
)) {
2137 head_need
+= sdata
->encrypt_headroom
;
2138 head_need
+= local
->tx_headroom
;
2139 head_need
= max_t(int, 0, head_need
);
2140 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2141 ieee80211_free_txskb(&local
->hw
, skb
);
2148 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2149 nh_pos
+= encaps_len
;
2150 h_pos
+= encaps_len
;
2153 #ifdef CONFIG_MAC80211_MESH
2154 if (meshhdrlen
> 0) {
2155 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2156 nh_pos
+= meshhdrlen
;
2157 h_pos
+= meshhdrlen
;
2161 if (ieee80211_is_data_qos(fc
)) {
2162 __le16
*qos_control
;
2164 qos_control
= (__le16
*) skb_push(skb
, 2);
2165 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2167 * Maybe we could actually set some fields here, for now just
2168 * initialise to zero to indicate no special operation.
2172 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2177 dev
->stats
.tx_packets
++;
2178 dev
->stats
.tx_bytes
+= skb
->len
;
2180 /* Update skb pointers to various headers since this modified frame
2181 * is going to go through Linux networking code that may potentially
2182 * need things like pointer to IP header. */
2183 skb_set_mac_header(skb
, 0);
2184 skb_set_network_header(skb
, nh_pos
);
2185 skb_set_transport_header(skb
, h_pos
);
2187 info
= IEEE80211_SKB_CB(skb
);
2188 memset(info
, 0, sizeof(*info
));
2190 dev
->trans_start
= jiffies
;
2192 info
->flags
= info_flags
;
2193 info
->ack_frame_id
= info_id
;
2195 ieee80211_xmit(sdata
, skb
, band
);
2198 return NETDEV_TX_OK
;
2204 return NETDEV_TX_OK
;
2209 * ieee80211_clear_tx_pending may not be called in a context where
2210 * it is possible that it packets could come in again.
2212 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2214 struct sk_buff
*skb
;
2217 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2218 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2219 ieee80211_free_txskb(&local
->hw
, skb
);
2224 * Returns false if the frame couldn't be transmitted but was queued instead,
2225 * which in this case means re-queued -- take as an indication to stop sending
2226 * more pending frames.
2228 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2229 struct sk_buff
*skb
)
2231 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2232 struct ieee80211_sub_if_data
*sdata
;
2233 struct sta_info
*sta
;
2234 struct ieee80211_hdr
*hdr
;
2236 struct ieee80211_chanctx_conf
*chanctx_conf
;
2238 sdata
= vif_to_sdata(info
->control
.vif
);
2240 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2241 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2242 if (unlikely(!chanctx_conf
)) {
2246 result
= ieee80211_tx(sdata
, skb
, true,
2247 chanctx_conf
->def
.chan
->band
);
2249 struct sk_buff_head skbs
;
2251 __skb_queue_head_init(&skbs
);
2252 __skb_queue_tail(&skbs
, skb
);
2254 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2255 sta
= sta_info_get(sdata
, hdr
->addr1
);
2257 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2264 * Transmit all pending packets. Called from tasklet.
2266 void ieee80211_tx_pending(unsigned long data
)
2268 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2269 unsigned long flags
;
2275 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2276 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2278 * If queue is stopped by something other than due to pending
2279 * frames, or we have no pending frames, proceed to next queue.
2281 if (local
->queue_stop_reasons
[i
] ||
2282 skb_queue_empty(&local
->pending
[i
]))
2285 while (!skb_queue_empty(&local
->pending
[i
])) {
2286 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2287 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2289 if (WARN_ON(!info
->control
.vif
)) {
2290 ieee80211_free_txskb(&local
->hw
, skb
);
2294 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2297 txok
= ieee80211_tx_pending_skb(local
, skb
);
2298 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2304 if (skb_queue_empty(&local
->pending
[i
]))
2305 ieee80211_propagate_queue_wake(local
, i
);
2307 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2312 /* functions for drivers to get certain frames */
2314 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2315 struct ps_data
*ps
, struct sk_buff
*skb
)
2319 int i
, have_bits
= 0, n1
, n2
;
2321 /* Generate bitmap for TIM only if there are any STAs in power save
2323 if (atomic_read(&ps
->num_sta_ps
) > 0)
2324 /* in the hope that this is faster than
2325 * checking byte-for-byte */
2326 have_bits
= !bitmap_empty((unsigned long*)ps
->tim
,
2327 IEEE80211_MAX_AID
+1);
2329 if (ps
->dtim_count
== 0)
2330 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2334 tim
= pos
= (u8
*) skb_put(skb
, 6);
2335 *pos
++ = WLAN_EID_TIM
;
2337 *pos
++ = ps
->dtim_count
;
2338 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2340 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2343 ps
->dtim_bc_mc
= aid0
== 1;
2346 /* Find largest even number N1 so that bits numbered 1 through
2347 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2348 * (N2 + 1) x 8 through 2007 are 0. */
2350 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2357 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2364 /* Bitmap control */
2366 /* Part Virt Bitmap */
2367 skb_put(skb
, n2
- n1
);
2368 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2370 tim
[1] = n2
- n1
+ 4;
2372 *pos
++ = aid0
; /* Bitmap control */
2373 *pos
++ = 0; /* Part Virt Bitmap */
2377 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2378 struct ps_data
*ps
, struct sk_buff
*skb
)
2380 struct ieee80211_local
*local
= sdata
->local
;
2383 * Not very nice, but we want to allow the driver to call
2384 * ieee80211_beacon_get() as a response to the set_tim()
2385 * callback. That, however, is already invoked under the
2386 * sta_lock to guarantee consistent and race-free update
2387 * of the tim bitmap in mac80211 and the driver.
2389 if (local
->tim_in_locked_section
) {
2390 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2392 spin_lock_bh(&local
->tim_lock
);
2393 __ieee80211_beacon_add_tim(sdata
, ps
, skb
);
2394 spin_unlock_bh(&local
->tim_lock
);
2400 void ieee80211_csa_finish(struct ieee80211_vif
*vif
)
2402 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2404 ieee80211_queue_work(&sdata
->local
->hw
,
2405 &sdata
->csa_finalize_work
);
2407 EXPORT_SYMBOL(ieee80211_csa_finish
);
2409 static void ieee80211_update_csa(struct ieee80211_sub_if_data
*sdata
,
2410 struct beacon_data
*beacon
)
2412 struct probe_resp
*resp
;
2413 int counter_offset_beacon
= sdata
->csa_counter_offset_beacon
;
2414 int counter_offset_presp
= sdata
->csa_counter_offset_presp
;
2416 size_t beacon_data_len
;
2418 switch (sdata
->vif
.type
) {
2419 case NL80211_IFTYPE_AP
:
2420 beacon_data
= beacon
->tail
;
2421 beacon_data_len
= beacon
->tail_len
;
2423 case NL80211_IFTYPE_ADHOC
:
2424 beacon_data
= beacon
->head
;
2425 beacon_data_len
= beacon
->head_len
;
2427 case NL80211_IFTYPE_MESH_POINT
:
2428 beacon_data
= beacon
->head
;
2429 beacon_data_len
= beacon
->head_len
;
2434 if (WARN_ON(counter_offset_beacon
>= beacon_data_len
))
2437 /* warn if the driver did not check for/react to csa completeness */
2438 if (WARN_ON(beacon_data
[counter_offset_beacon
] == 0))
2441 beacon_data
[counter_offset_beacon
]--;
2443 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& counter_offset_presp
) {
2445 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
2447 /* if nl80211 accepted the offset, this should not happen. */
2448 if (WARN_ON(!resp
)) {
2452 resp
->data
[counter_offset_presp
]--;
2457 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
2459 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2460 struct beacon_data
*beacon
= NULL
;
2462 size_t beacon_data_len
;
2463 int counter_beacon
= sdata
->csa_counter_offset_beacon
;
2466 if (!ieee80211_sdata_running(sdata
))
2470 if (vif
->type
== NL80211_IFTYPE_AP
) {
2471 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2473 beacon
= rcu_dereference(ap
->beacon
);
2474 if (WARN_ON(!beacon
|| !beacon
->tail
))
2476 beacon_data
= beacon
->tail
;
2477 beacon_data_len
= beacon
->tail_len
;
2478 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
2479 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2481 beacon
= rcu_dereference(ifibss
->presp
);
2485 beacon_data
= beacon
->head
;
2486 beacon_data_len
= beacon
->head_len
;
2487 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
2488 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2490 beacon
= rcu_dereference(ifmsh
->beacon
);
2494 beacon_data
= beacon
->head
;
2495 beacon_data_len
= beacon
->head_len
;
2501 if (WARN_ON(counter_beacon
> beacon_data_len
))
2504 if (beacon_data
[counter_beacon
] == 0)
2511 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
2513 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2514 struct ieee80211_vif
*vif
,
2515 u16
*tim_offset
, u16
*tim_length
)
2517 struct ieee80211_local
*local
= hw_to_local(hw
);
2518 struct sk_buff
*skb
= NULL
;
2519 struct ieee80211_tx_info
*info
;
2520 struct ieee80211_sub_if_data
*sdata
= NULL
;
2521 enum ieee80211_band band
;
2522 struct ieee80211_tx_rate_control txrc
;
2523 struct ieee80211_chanctx_conf
*chanctx_conf
;
2527 sdata
= vif_to_sdata(vif
);
2528 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2530 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2538 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2539 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2540 struct beacon_data
*beacon
= rcu_dereference(ap
->beacon
);
2543 if (sdata
->vif
.csa_active
)
2544 ieee80211_update_csa(sdata
, beacon
);
2547 * headroom, head length,
2548 * tail length and maximum TIM length
2550 skb
= dev_alloc_skb(local
->tx_headroom
+
2552 beacon
->tail_len
+ 256 +
2553 local
->hw
.extra_beacon_tailroom
);
2557 skb_reserve(skb
, local
->tx_headroom
);
2558 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2561 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
);
2564 *tim_offset
= beacon
->head_len
;
2566 *tim_length
= skb
->len
- beacon
->head_len
;
2569 memcpy(skb_put(skb
, beacon
->tail_len
),
2570 beacon
->tail
, beacon
->tail_len
);
2573 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2574 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2575 struct ieee80211_hdr
*hdr
;
2576 struct beacon_data
*presp
= rcu_dereference(ifibss
->presp
);
2581 if (sdata
->vif
.csa_active
)
2582 ieee80211_update_csa(sdata
, presp
);
2585 skb
= dev_alloc_skb(local
->tx_headroom
+ presp
->head_len
+
2586 local
->hw
.extra_beacon_tailroom
);
2589 skb_reserve(skb
, local
->tx_headroom
);
2590 memcpy(skb_put(skb
, presp
->head_len
), presp
->head
,
2593 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2594 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2595 IEEE80211_STYPE_BEACON
);
2596 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2597 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2598 struct beacon_data
*bcn
= rcu_dereference(ifmsh
->beacon
);
2603 if (sdata
->vif
.csa_active
)
2604 ieee80211_update_csa(sdata
, bcn
);
2606 if (ifmsh
->sync_ops
)
2607 ifmsh
->sync_ops
->adjust_tbtt(sdata
, bcn
);
2609 skb
= dev_alloc_skb(local
->tx_headroom
+
2613 local
->hw
.extra_beacon_tailroom
);
2616 skb_reserve(skb
, local
->tx_headroom
);
2617 memcpy(skb_put(skb
, bcn
->head_len
), bcn
->head
, bcn
->head_len
);
2618 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
);
2619 memcpy(skb_put(skb
, bcn
->tail_len
), bcn
->tail
, bcn
->tail_len
);
2625 band
= chanctx_conf
->def
.chan
->band
;
2627 info
= IEEE80211_SKB_CB(skb
);
2629 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2630 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2633 memset(&txrc
, 0, sizeof(txrc
));
2635 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2636 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2638 txrc
.reported_rate
.idx
= -1;
2639 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2640 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2641 txrc
.max_rate_idx
= -1;
2643 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2645 rate_control_get_rate(sdata
, NULL
, &txrc
);
2647 info
->control
.vif
= vif
;
2649 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2650 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2651 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2656 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2658 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2659 struct ieee80211_vif
*vif
)
2661 struct ieee80211_if_ap
*ap
= NULL
;
2662 struct sk_buff
*skb
= NULL
;
2663 struct probe_resp
*presp
= NULL
;
2664 struct ieee80211_hdr
*hdr
;
2665 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2667 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2673 presp
= rcu_dereference(ap
->probe_resp
);
2677 skb
= dev_alloc_skb(presp
->len
);
2681 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2683 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2684 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2690 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2692 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2693 struct ieee80211_vif
*vif
)
2695 struct ieee80211_sub_if_data
*sdata
;
2696 struct ieee80211_if_managed
*ifmgd
;
2697 struct ieee80211_pspoll
*pspoll
;
2698 struct ieee80211_local
*local
;
2699 struct sk_buff
*skb
;
2701 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2704 sdata
= vif_to_sdata(vif
);
2705 ifmgd
= &sdata
->u
.mgd
;
2706 local
= sdata
->local
;
2708 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2712 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2714 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2715 memset(pspoll
, 0, sizeof(*pspoll
));
2716 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2717 IEEE80211_STYPE_PSPOLL
);
2718 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2720 /* aid in PS-Poll has its two MSBs each set to 1 */
2721 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2723 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2724 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2728 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2730 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2731 struct ieee80211_vif
*vif
)
2733 struct ieee80211_hdr_3addr
*nullfunc
;
2734 struct ieee80211_sub_if_data
*sdata
;
2735 struct ieee80211_if_managed
*ifmgd
;
2736 struct ieee80211_local
*local
;
2737 struct sk_buff
*skb
;
2739 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2742 sdata
= vif_to_sdata(vif
);
2743 ifmgd
= &sdata
->u
.mgd
;
2744 local
= sdata
->local
;
2746 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2750 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2752 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2754 memset(nullfunc
, 0, sizeof(*nullfunc
));
2755 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2756 IEEE80211_STYPE_NULLFUNC
|
2757 IEEE80211_FCTL_TODS
);
2758 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2759 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2760 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2764 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2766 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2767 struct ieee80211_vif
*vif
,
2768 const u8
*ssid
, size_t ssid_len
,
2771 struct ieee80211_sub_if_data
*sdata
;
2772 struct ieee80211_local
*local
;
2773 struct ieee80211_hdr_3addr
*hdr
;
2774 struct sk_buff
*skb
;
2778 sdata
= vif_to_sdata(vif
);
2779 local
= sdata
->local
;
2780 ie_ssid_len
= 2 + ssid_len
;
2782 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2783 ie_ssid_len
+ tailroom
);
2787 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2789 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2790 memset(hdr
, 0, sizeof(*hdr
));
2791 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2792 IEEE80211_STYPE_PROBE_REQ
);
2793 eth_broadcast_addr(hdr
->addr1
);
2794 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2795 eth_broadcast_addr(hdr
->addr3
);
2797 pos
= skb_put(skb
, ie_ssid_len
);
2798 *pos
++ = WLAN_EID_SSID
;
2801 memcpy(pos
, ssid
, ssid_len
);
2806 EXPORT_SYMBOL(ieee80211_probereq_get
);
2808 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2809 const void *frame
, size_t frame_len
,
2810 const struct ieee80211_tx_info
*frame_txctl
,
2811 struct ieee80211_rts
*rts
)
2813 const struct ieee80211_hdr
*hdr
= frame
;
2815 rts
->frame_control
=
2816 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2817 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2819 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2820 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2822 EXPORT_SYMBOL(ieee80211_rts_get
);
2824 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2825 const void *frame
, size_t frame_len
,
2826 const struct ieee80211_tx_info
*frame_txctl
,
2827 struct ieee80211_cts
*cts
)
2829 const struct ieee80211_hdr
*hdr
= frame
;
2831 cts
->frame_control
=
2832 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2833 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2834 frame_len
, frame_txctl
);
2835 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2837 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2840 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2841 struct ieee80211_vif
*vif
)
2843 struct ieee80211_local
*local
= hw_to_local(hw
);
2844 struct sk_buff
*skb
= NULL
;
2845 struct ieee80211_tx_data tx
;
2846 struct ieee80211_sub_if_data
*sdata
;
2848 struct ieee80211_tx_info
*info
;
2849 struct ieee80211_chanctx_conf
*chanctx_conf
;
2851 sdata
= vif_to_sdata(vif
);
2854 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2859 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2860 struct beacon_data
*beacon
=
2861 rcu_dereference(sdata
->u
.ap
.beacon
);
2863 if (!beacon
|| !beacon
->head
)
2866 ps
= &sdata
->u
.ap
.ps
;
2867 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2868 ps
= &sdata
->u
.mesh
.ps
;
2873 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
2874 goto out
; /* send buffered bc/mc only after DTIM beacon */
2877 skb
= skb_dequeue(&ps
->bc_buf
);
2880 local
->total_ps_buffered
--;
2882 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
2883 struct ieee80211_hdr
*hdr
=
2884 (struct ieee80211_hdr
*) skb
->data
;
2885 /* more buffered multicast/broadcast frames ==> set
2886 * MoreData flag in IEEE 802.11 header to inform PS
2888 hdr
->frame_control
|=
2889 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2892 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2893 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
2894 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2896 dev_kfree_skb_any(skb
);
2899 info
= IEEE80211_SKB_CB(skb
);
2901 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2902 info
->band
= chanctx_conf
->def
.chan
->band
;
2904 if (invoke_tx_handlers(&tx
))
2911 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2913 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
2914 struct sk_buff
*skb
, int tid
,
2915 enum ieee80211_band band
)
2917 int ac
= ieee802_1d_to_ac
[tid
& 7];
2919 skb_set_mac_header(skb
, 0);
2920 skb_set_network_header(skb
, 0);
2921 skb_set_transport_header(skb
, 0);
2923 skb_set_queue_mapping(skb
, ac
);
2924 skb
->priority
= tid
;
2926 skb
->dev
= sdata
->dev
;
2929 * The other path calling ieee80211_xmit is from the tasklet,
2930 * and while we can handle concurrent transmissions locking
2931 * requirements are that we do not come into tx with bhs on.
2934 ieee80211_xmit(sdata
, skb
, band
);