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>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <linux/time.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
42 struct sk_buff
*skb
, int group_addr
,
45 int rate
, mrate
, erp
, dur
, i
, shift
= 0;
46 struct ieee80211_rate
*txrate
;
47 struct ieee80211_local
*local
= tx
->local
;
48 struct ieee80211_supported_band
*sband
;
49 struct ieee80211_hdr
*hdr
;
50 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
51 struct ieee80211_chanctx_conf
*chanctx_conf
;
55 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
57 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
58 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
62 /* assume HW handles this */
63 if (tx
->rate
.flags
& (IEEE80211_TX_RC_MCS
| IEEE80211_TX_RC_VHT_MCS
))
67 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
70 sband
= local
->hw
.wiphy
->bands
[info
->band
];
71 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
73 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
76 * data and mgmt (except PS Poll):
78 * - during contention period:
79 * if addr1 is group address: 0
80 * if more fragments = 0 and addr1 is individual address: time to
81 * transmit one ACK plus SIFS
82 * if more fragments = 1 and addr1 is individual address: time to
83 * transmit next fragment plus 2 x ACK plus 3 x SIFS
86 * - control response frame (CTS or ACK) shall be transmitted using the
87 * same rate as the immediately previous frame in the frame exchange
88 * sequence, if this rate belongs to the PHY mandatory rates, or else
89 * at the highest possible rate belonging to the PHY rates in the
92 hdr
= (struct ieee80211_hdr
*)skb
->data
;
93 if (ieee80211_is_ctl(hdr
->frame_control
)) {
94 /* TODO: These control frames are not currently sent by
95 * mac80211, but should they be implemented, this function
96 * needs to be updated to support duration field calculation.
98 * RTS: time needed to transmit pending data/mgmt frame plus
99 * one CTS frame plus one ACK frame plus 3 x SIFS
100 * CTS: duration of immediately previous RTS minus time
101 * required to transmit CTS and its SIFS
102 * ACK: 0 if immediately previous directed data/mgmt had
103 * more=0, with more=1 duration in ACK frame is duration
104 * from previous frame minus time needed to transmit ACK
106 * PS Poll: BIT(15) | BIT(14) | aid
112 if (0 /* FIX: data/mgmt during CFP */)
113 return cpu_to_le16(32768);
115 if (group_addr
) /* Group address as the destination - no ACK */
118 /* Individual destination address:
119 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
120 * CTS and ACK frames shall be transmitted using the highest rate in
121 * basic rate set that is less than or equal to the rate of the
122 * immediately previous frame and that is using the same modulation
123 * (CCK or OFDM). If no basic rate set matches with these requirements,
124 * the highest mandatory rate of the PHY that is less than or equal to
125 * the rate of the previous frame is used.
126 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
129 /* use lowest available if everything fails */
130 mrate
= sband
->bitrates
[0].bitrate
;
131 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
132 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
134 if (r
->bitrate
> txrate
->bitrate
)
137 if ((rate_flags
& r
->flags
) != rate_flags
)
140 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
141 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
143 switch (sband
->band
) {
144 case IEEE80211_BAND_2GHZ
: {
146 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
147 flag
= IEEE80211_RATE_MANDATORY_G
;
149 flag
= IEEE80211_RATE_MANDATORY_B
;
154 case IEEE80211_BAND_5GHZ
:
155 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
158 case IEEE80211_BAND_60GHZ
:
159 /* TODO, for now fall through */
160 case IEEE80211_NUM_BANDS
:
166 /* No matching basic rate found; use highest suitable mandatory
168 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
171 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
172 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
173 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
176 /* Time needed to transmit ACK
177 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
178 * to closest integer */
179 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
180 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
184 /* Frame is fragmented: duration increases with time needed to
185 * transmit next fragment plus ACK and 2 x SIFS. */
186 dur
*= 2; /* ACK + SIFS */
188 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
189 txrate
->bitrate
, erp
,
190 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
194 return cpu_to_le16(dur
);
198 static ieee80211_tx_result debug_noinline
199 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
201 struct ieee80211_local
*local
= tx
->local
;
202 struct ieee80211_if_managed
*ifmgd
;
204 /* driver doesn't support power save */
205 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
208 /* hardware does dynamic power save */
209 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
212 /* dynamic power save disabled */
213 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
216 /* we are scanning, don't enable power save */
220 if (!local
->ps_sdata
)
223 /* No point if we're going to suspend */
224 if (local
->quiescing
)
227 /* dynamic ps is supported only in managed mode */
228 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
231 ifmgd
= &tx
->sdata
->u
.mgd
;
234 * Don't wakeup from power save if u-apsd is enabled, voip ac has
235 * u-apsd enabled and the frame is in voip class. This effectively
236 * means that even if all access categories have u-apsd enabled, in
237 * practise u-apsd is only used with the voip ac. This is a
238 * workaround for the case when received voip class packets do not
239 * have correct qos tag for some reason, due the network or the
242 * Note: ifmgd->uapsd_queues access is racy here. If the value is
243 * changed via debugfs, user needs to reassociate manually to have
244 * everything in sync.
246 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
247 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
248 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
251 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
252 ieee80211_stop_queues_by_reason(&local
->hw
,
253 IEEE80211_MAX_QUEUE_MAP
,
254 IEEE80211_QUEUE_STOP_REASON_PS
,
256 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
257 ieee80211_queue_work(&local
->hw
,
258 &local
->dynamic_ps_disable_work
);
261 /* Don't restart the timer if we're not disassociated */
262 if (!ifmgd
->associated
)
265 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
266 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
271 static ieee80211_tx_result debug_noinline
272 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
275 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
276 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
279 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
282 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
283 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
284 !ieee80211_is_probe_req(hdr
->frame_control
) &&
285 !ieee80211_is_nullfunc(hdr
->frame_control
))
287 * When software scanning only nullfunc frames (to notify
288 * the sleep state to the AP) and probe requests (for the
289 * active scan) are allowed, all other frames should not be
290 * sent and we should not get here, but if we do
291 * nonetheless, drop them to avoid sending them
292 * off-channel. See the link below and
293 * ieee80211_start_scan() for more.
295 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
299 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
)
302 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
305 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
308 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
312 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
314 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
315 if (unlikely(!assoc
&&
316 ieee80211_is_data(hdr
->frame_control
))) {
317 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
318 sdata_info(tx
->sdata
,
319 "dropped data frame to not associated station %pM\n",
322 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
325 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
326 ieee80211_is_data(hdr
->frame_control
) &&
327 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
329 * No associated STAs - no need to send multicast
338 /* This function is called whenever the AP is about to exceed the maximum limit
339 * of buffered frames for power saving STAs. This situation should not really
340 * happen often during normal operation, so dropping the oldest buffered packet
341 * from each queue should be OK to make some room for new frames. */
342 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
344 int total
= 0, purged
= 0;
346 struct ieee80211_sub_if_data
*sdata
;
347 struct sta_info
*sta
;
349 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
352 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
353 ps
= &sdata
->u
.ap
.ps
;
354 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
355 ps
= &sdata
->u
.mesh
.ps
;
359 skb
= skb_dequeue(&ps
->bc_buf
);
364 total
+= skb_queue_len(&ps
->bc_buf
);
368 * Drop one frame from each station from the lowest-priority
369 * AC that has frames at all.
371 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
374 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
375 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
376 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
379 ieee80211_free_txskb(&local
->hw
, skb
);
385 local
->total_ps_buffered
= total
;
386 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
389 static ieee80211_tx_result
390 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
392 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
393 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
397 * broadcast/multicast frame
399 * If any of the associated/peer stations is in power save mode,
400 * the frame is buffered to be sent after DTIM beacon frame.
401 * This is done either by the hardware or us.
404 /* powersaving STAs currently only in AP/VLAN/mesh mode */
405 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
406 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
410 ps
= &tx
->sdata
->bss
->ps
;
411 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
412 ps
= &tx
->sdata
->u
.mesh
.ps
;
418 /* no buffering for ordered frames */
419 if (ieee80211_has_order(hdr
->frame_control
))
422 if (ieee80211_is_probe_req(hdr
->frame_control
))
425 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
426 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
428 /* no stations in PS mode */
429 if (!atomic_read(&ps
->num_sta_ps
))
432 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
434 /* device releases frame after DTIM beacon */
435 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
438 /* buffered in mac80211 */
439 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
440 purge_old_ps_buffers(tx
->local
);
442 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
444 "BC TX buffer full - dropping the oldest frame\n");
445 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
447 tx
->local
->total_ps_buffered
++;
449 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
454 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
457 if (!ieee80211_is_mgmt(fc
))
460 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
463 if (!ieee80211_is_robust_mgmt_frame(skb
))
469 static ieee80211_tx_result
470 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
472 struct sta_info
*sta
= tx
->sta
;
473 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
474 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
475 struct ieee80211_local
*local
= tx
->local
;
480 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
481 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
482 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) &&
483 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
484 int ac
= skb_get_queue_mapping(tx
->skb
);
486 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
487 !ieee80211_is_bufferable_mmpdu(hdr
->frame_control
)) {
488 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
492 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
493 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
494 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
495 purge_old_ps_buffers(tx
->local
);
497 /* sync with ieee80211_sta_ps_deliver_wakeup */
498 spin_lock(&sta
->ps_lock
);
500 * STA woke up the meantime and all the frames on ps_tx_buf have
501 * been queued to pending queue. No reordering can happen, go
502 * ahead and Tx the packet.
504 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
505 !test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) &&
506 !test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) {
507 spin_unlock(&sta
->ps_lock
);
511 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
512 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
514 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
516 ieee80211_free_txskb(&local
->hw
, old
);
518 tx
->local
->total_ps_buffered
++;
520 info
->control
.jiffies
= jiffies
;
521 info
->control
.vif
= &tx
->sdata
->vif
;
522 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
523 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
524 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
525 spin_unlock(&sta
->ps_lock
);
527 if (!timer_pending(&local
->sta_cleanup
))
528 mod_timer(&local
->sta_cleanup
,
529 round_jiffies(jiffies
+
530 STA_INFO_CLEANUP_INTERVAL
));
533 * We queued up some frames, so the TIM bit might
534 * need to be set, recalculate it.
536 sta_info_recalc_tim(sta
);
539 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
541 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 static ieee80211_tx_result debug_noinline
549 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
551 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
554 if (tx
->flags
& IEEE80211_TX_UNICAST
)
555 return ieee80211_tx_h_unicast_ps_buf(tx
);
557 return ieee80211_tx_h_multicast_ps_buf(tx
);
560 static ieee80211_tx_result debug_noinline
561 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
563 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
565 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
566 if (tx
->sdata
->control_port_no_encrypt
)
567 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
568 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
569 info
->flags
|= IEEE80211_TX_CTL_USE_MINRATE
;
575 static ieee80211_tx_result debug_noinline
576 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
578 struct ieee80211_key
*key
;
579 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
580 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
582 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
585 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
587 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
588 is_multicast_ether_addr(hdr
->addr1
) &&
589 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
590 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
592 else if (is_multicast_ether_addr(hdr
->addr1
) &&
593 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
595 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
596 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
598 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
600 else if (!tx
->sdata
->drop_unencrypted
)
602 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
604 else if (ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
605 !(ieee80211_is_action(hdr
->frame_control
) &&
606 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
608 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
609 !ieee80211_is_robust_mgmt_frame(tx
->skb
))
612 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
617 bool skip_hw
= false;
619 tx
->key
->tx_rx_count
++;
620 /* TODO: add threshold stuff again */
622 switch (tx
->key
->conf
.cipher
) {
623 case WLAN_CIPHER_SUITE_WEP40
:
624 case WLAN_CIPHER_SUITE_WEP104
:
625 case WLAN_CIPHER_SUITE_TKIP
:
626 if (!ieee80211_is_data_present(hdr
->frame_control
))
629 case WLAN_CIPHER_SUITE_CCMP
:
630 case WLAN_CIPHER_SUITE_CCMP_256
:
631 case WLAN_CIPHER_SUITE_GCMP
:
632 case WLAN_CIPHER_SUITE_GCMP_256
:
633 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
634 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
638 skip_hw
= (tx
->key
->conf
.flags
&
639 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
640 ieee80211_is_mgmt(hdr
->frame_control
);
642 case WLAN_CIPHER_SUITE_AES_CMAC
:
643 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
644 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
645 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
646 if (!ieee80211_is_mgmt(hdr
->frame_control
))
651 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
652 !ieee80211_is_deauth(hdr
->frame_control
)))
655 if (!skip_hw
&& tx
->key
&&
656 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
657 info
->control
.hw_key
= &tx
->key
->conf
;
663 static ieee80211_tx_result debug_noinline
664 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
666 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
667 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
668 struct ieee80211_supported_band
*sband
;
670 struct ieee80211_tx_rate_control txrc
;
671 struct ieee80211_sta_rates
*ratetbl
= NULL
;
674 memset(&txrc
, 0, sizeof(txrc
));
676 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
678 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
679 tx
->local
->hw
.wiphy
->frag_threshold
);
681 /* set up the tx rate control struct we give the RC algo */
682 txrc
.hw
= &tx
->local
->hw
;
684 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
686 txrc
.reported_rate
.idx
= -1;
687 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
688 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
689 txrc
.max_rate_idx
= -1;
691 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
693 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
694 txrc
.rate_idx_mcs_mask
=
695 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
697 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
698 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
699 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
701 /* set up RTS protection if desired */
702 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
706 info
->control
.use_rts
= txrc
.rts
;
707 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
710 * Use short preamble if the BSS can handle it, but not for
711 * management frames unless we know the receiver can handle
712 * that -- the management frame might be to a station that
713 * just wants a probe response.
715 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
716 (ieee80211_is_data(hdr
->frame_control
) ||
717 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
718 txrc
.short_preamble
= true;
720 info
->control
.short_preamble
= txrc
.short_preamble
;
723 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
726 * Lets not bother rate control if we're associated and cannot
727 * talk to the sta. This should not happen.
729 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
730 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
731 "%s: Dropped data frame as no usable bitrate found while "
732 "scanning and associated. Target station: "
733 "%pM on %d GHz band\n",
734 tx
->sdata
->name
, hdr
->addr1
,
739 * If we're associated with the sta at this point we know we can at
740 * least send the frame at the lowest bit rate.
742 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
744 if (tx
->sta
&& !info
->control
.skip_table
)
745 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
747 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
749 struct ieee80211_tx_rate rate
= {
750 .idx
= ratetbl
->rate
[0].idx
,
751 .flags
= ratetbl
->rate
[0].flags
,
752 .count
= ratetbl
->rate
[0].count
755 if (ratetbl
->rate
[0].idx
< 0)
763 tx
->rate
= info
->control
.rates
[0];
766 if (txrc
.reported_rate
.idx
< 0) {
767 txrc
.reported_rate
= tx
->rate
;
768 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
769 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
771 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
776 if (unlikely(!info
->control
.rates
[0].count
))
777 info
->control
.rates
[0].count
= 1;
779 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
780 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
781 info
->control
.rates
[0].count
= 1;
786 static ieee80211_tx_result debug_noinline
787 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
789 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
790 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
796 * Packet injection may want to control the sequence
797 * number, if we have no matching interface then we
798 * neither assign one ourselves nor ask the driver to.
800 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
803 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
806 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
809 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
813 * Anything but QoS data that has a sequence number field
814 * (is long enough) gets a sequence number from the global
815 * counter. QoS data frames with a multicast destination
816 * also use the global counter (802.11-2012 9.3.2.10).
818 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
819 is_multicast_ether_addr(hdr
->addr1
)) {
820 /* driver should assign sequence number */
821 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
822 /* for pure STA mode without beacons, we can do it */
823 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
824 tx
->sdata
->sequence_number
+= 0x10;
826 tx
->sta
->tx_msdu
[IEEE80211_NUM_TIDS
]++;
831 * This should be true for injected/management frames only, for
832 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
833 * above since they are not QoS-data frames.
838 /* include per-STA, per-TID sequence counter */
840 qc
= ieee80211_get_qos_ctl(hdr
);
841 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
842 seq
= &tx
->sta
->tid_seq
[tid
];
843 tx
->sta
->tx_msdu
[tid
]++;
845 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
847 /* Increase the sequence number. */
848 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
853 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
854 struct sk_buff
*skb
, int hdrlen
,
857 struct ieee80211_local
*local
= tx
->local
;
858 struct ieee80211_tx_info
*info
;
860 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
861 int pos
= hdrlen
+ per_fragm
;
862 int rem
= skb
->len
- hdrlen
- per_fragm
;
864 if (WARN_ON(rem
< 0))
867 /* first fragment was already added to queue by caller */
870 int fraglen
= per_fragm
;
875 tmp
= dev_alloc_skb(local
->tx_headroom
+
877 tx
->sdata
->encrypt_headroom
+
878 IEEE80211_ENCRYPT_TAILROOM
);
882 __skb_queue_tail(&tx
->skbs
, tmp
);
885 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
887 /* copy control information */
888 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
890 info
= IEEE80211_SKB_CB(tmp
);
891 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
892 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
895 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
897 skb_copy_queue_mapping(tmp
, skb
);
898 tmp
->priority
= skb
->priority
;
901 /* copy header and data */
902 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
903 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
908 /* adjust first fragment's length */
909 skb_trim(skb
, hdrlen
+ per_fragm
);
913 static ieee80211_tx_result debug_noinline
914 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
916 struct sk_buff
*skb
= tx
->skb
;
917 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
918 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
919 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
923 /* no matter what happens, tx->skb moves to tx->skbs */
924 __skb_queue_tail(&tx
->skbs
, skb
);
927 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
930 if (tx
->local
->ops
->set_frag_threshold
)
934 * Warn when submitting a fragmented A-MPDU frame and drop it.
935 * This scenario is handled in ieee80211_tx_prepare but extra
936 * caution taken here as fragmented ampdu may cause Tx stop.
938 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
941 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
943 /* internal error, why isn't DONTFRAG set? */
944 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
948 * Now fragment the frame. This will allocate all the fragments and
949 * chain them (using skb as the first fragment) to skb->next.
950 * During transmission, we will remove the successfully transmitted
951 * fragments from this list. When the low-level driver rejects one
952 * of the fragments then we will simply pretend to accept the skb
953 * but store it away as pending.
955 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
958 /* update duration/seq/flags of fragments */
961 skb_queue_walk(&tx
->skbs
, skb
) {
962 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
964 hdr
= (void *)skb
->data
;
965 info
= IEEE80211_SKB_CB(skb
);
967 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
968 hdr
->frame_control
|= morefrags
;
970 * No multi-rate retries for fragmented frames, that
971 * would completely throw off the NAV at other STAs.
973 info
->control
.rates
[1].idx
= -1;
974 info
->control
.rates
[2].idx
= -1;
975 info
->control
.rates
[3].idx
= -1;
976 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
977 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
979 hdr
->frame_control
&= ~morefrags
;
981 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
988 static ieee80211_tx_result debug_noinline
989 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
997 skb_queue_walk(&tx
->skbs
, skb
) {
998 ac
= skb_get_queue_mapping(skb
);
999 tx
->sta
->tx_fragments
++;
1000 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
1003 tx
->sta
->tx_packets
[ac
]++;
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1014 switch (tx
->key
->conf
.cipher
) {
1015 case WLAN_CIPHER_SUITE_WEP40
:
1016 case WLAN_CIPHER_SUITE_WEP104
:
1017 return ieee80211_crypto_wep_encrypt(tx
);
1018 case WLAN_CIPHER_SUITE_TKIP
:
1019 return ieee80211_crypto_tkip_encrypt(tx
);
1020 case WLAN_CIPHER_SUITE_CCMP
:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx
, IEEE80211_CCMP_MIC_LEN
);
1023 case WLAN_CIPHER_SUITE_CCMP_256
:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1026 case WLAN_CIPHER_SUITE_AES_CMAC
:
1027 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1032 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1033 case WLAN_CIPHER_SUITE_GCMP
:
1034 case WLAN_CIPHER_SUITE_GCMP_256
:
1035 return ieee80211_crypto_gcmp_encrypt(tx
);
1037 return ieee80211_crypto_hw_encrypt(tx
);
1043 static ieee80211_tx_result debug_noinline
1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1046 struct sk_buff
*skb
;
1047 struct ieee80211_hdr
*hdr
;
1051 skb_queue_walk(&tx
->skbs
, skb
) {
1052 hdr
= (void *) skb
->data
;
1053 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1054 break; /* must not overwrite AID */
1055 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1056 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1057 next_len
= next
->len
;
1060 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1063 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1069 /* actual transmit path */
1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1072 struct sk_buff
*skb
,
1073 struct ieee80211_tx_info
*info
,
1074 struct tid_ampdu_tx
*tid_tx
,
1077 bool queued
= false;
1078 bool reset_agg_timer
= false;
1079 struct sk_buff
*purge_skb
= NULL
;
1081 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1082 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1083 reset_agg_timer
= true;
1084 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1086 * nothing -- this aggregation session is being started
1087 * but that might still fail with the driver
1090 spin_lock(&tx
->sta
->lock
);
1092 * Need to re-check now, because we may get here
1094 * 1) in the window during which the setup is actually
1095 * already done, but not marked yet because not all
1096 * packets are spliced over to the driver pending
1097 * queue yet -- if this happened we acquire the lock
1098 * either before or after the splice happens, but
1099 * need to recheck which of these cases happened.
1101 * 2) during session teardown, if the OPERATIONAL bit
1102 * was cleared due to the teardown but the pointer
1103 * hasn't been assigned NULL yet (or we loaded it
1104 * before it was assigned) -- in this case it may
1105 * now be NULL which means we should just let the
1106 * packet pass through because splicing the frames
1107 * back is already done.
1109 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1112 /* do nothing, let packet pass through */
1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1114 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1115 reset_agg_timer
= true;
1118 info
->control
.vif
= &tx
->sdata
->vif
;
1119 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1120 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
1121 __skb_queue_tail(&tid_tx
->pending
, skb
);
1122 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1123 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1125 spin_unlock(&tx
->sta
->lock
);
1128 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1131 /* reset session timer */
1132 if (reset_agg_timer
&& tid_tx
->timeout
)
1133 tid_tx
->last_tx
= jiffies
;
1141 static ieee80211_tx_result
1142 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1143 struct ieee80211_tx_data
*tx
,
1144 struct sk_buff
*skb
)
1146 struct ieee80211_local
*local
= sdata
->local
;
1147 struct ieee80211_hdr
*hdr
;
1148 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1152 memset(tx
, 0, sizeof(*tx
));
1156 __skb_queue_head_init(&tx
->skbs
);
1159 * If this flag is set to true anywhere, and we get here,
1160 * we are doing the needed processing, so remove the flag
1163 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1165 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1167 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1168 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1169 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1171 } else if (info
->flags
& (IEEE80211_TX_CTL_INJECTED
|
1172 IEEE80211_TX_INTFL_NL80211_FRAME_TX
) ||
1173 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1174 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1177 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1179 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1180 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1181 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1182 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1183 struct tid_ampdu_tx
*tid_tx
;
1185 qc
= ieee80211_get_qos_ctl(hdr
);
1186 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1188 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1192 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1195 if (unlikely(queued
))
1200 if (is_multicast_ether_addr(hdr
->addr1
)) {
1201 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1202 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1204 tx
->flags
|= IEEE80211_TX_UNICAST
;
1206 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1207 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1208 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1209 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1210 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1214 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1215 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1216 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1218 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1223 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1224 struct ieee80211_vif
*vif
,
1225 struct ieee80211_sta
*sta
,
1226 struct sk_buff_head
*skbs
,
1229 struct ieee80211_tx_control control
;
1230 struct sk_buff
*skb
, *tmp
;
1231 unsigned long flags
;
1233 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1234 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1235 int q
= info
->hw_queue
;
1237 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1238 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1239 __skb_unlink(skb
, skbs
);
1240 ieee80211_free_txskb(&local
->hw
, skb
);
1245 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1246 if (local
->queue_stop_reasons
[q
] ||
1247 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1248 if (unlikely(info
->flags
&
1249 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1250 if (local
->queue_stop_reasons
[q
] &
1251 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1253 * Drop off-channel frames if queues
1254 * are stopped for any reason other
1255 * than off-channel operation. Never
1258 spin_unlock_irqrestore(
1259 &local
->queue_stop_reason_lock
,
1261 ieee80211_purge_tx_queue(&local
->hw
,
1268 * Since queue is stopped, queue up frames for
1269 * later transmission from the tx-pending
1270 * tasklet when the queue is woken again.
1273 skb_queue_splice_init(skbs
,
1274 &local
->pending
[q
]);
1276 skb_queue_splice_tail_init(skbs
,
1277 &local
->pending
[q
]);
1279 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1284 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1286 info
->control
.vif
= vif
;
1289 __skb_unlink(skb
, skbs
);
1290 drv_tx(local
, &control
, skb
);
1297 * Returns false if the frame couldn't be transmitted but was queued instead.
1299 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1300 struct sk_buff_head
*skbs
, int led_len
,
1301 struct sta_info
*sta
, bool txpending
)
1303 struct ieee80211_tx_info
*info
;
1304 struct ieee80211_sub_if_data
*sdata
;
1305 struct ieee80211_vif
*vif
;
1306 struct ieee80211_sta
*pubsta
;
1307 struct sk_buff
*skb
;
1311 if (WARN_ON(skb_queue_empty(skbs
)))
1314 skb
= skb_peek(skbs
);
1315 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1316 info
= IEEE80211_SKB_CB(skb
);
1317 sdata
= vif_to_sdata(info
->control
.vif
);
1318 if (sta
&& !sta
->uploaded
)
1326 switch (sdata
->vif
.type
) {
1327 case NL80211_IFTYPE_MONITOR
:
1328 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1332 sdata
= rcu_dereference(local
->monitor_sdata
);
1336 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1337 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1343 case NL80211_IFTYPE_AP_VLAN
:
1344 sdata
= container_of(sdata
->bss
,
1345 struct ieee80211_sub_if_data
, u
.ap
);
1352 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1355 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1357 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1363 * Invoke TX handlers, return 0 on success and non-zero if the
1364 * frame was dropped or queued.
1366 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1368 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1369 ieee80211_tx_result res
= TX_DROP
;
1371 #define CALL_TXH(txh) \
1374 if (res != TX_CONTINUE) \
1378 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1379 CALL_TXH(ieee80211_tx_h_check_assoc
);
1380 CALL_TXH(ieee80211_tx_h_ps_buf
);
1381 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1382 CALL_TXH(ieee80211_tx_h_select_key
);
1383 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1384 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1386 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1387 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1392 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1393 CALL_TXH(ieee80211_tx_h_sequence
);
1394 CALL_TXH(ieee80211_tx_h_fragment
);
1395 /* handlers after fragment must be aware of tx info fragmentation! */
1396 CALL_TXH(ieee80211_tx_h_stats
);
1397 CALL_TXH(ieee80211_tx_h_encrypt
);
1398 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1399 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1403 if (unlikely(res
== TX_DROP
)) {
1404 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1406 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1408 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1410 } else if (unlikely(res
== TX_QUEUED
)) {
1411 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1418 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1419 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1420 int band
, struct ieee80211_sta
**sta
)
1422 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1423 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1424 struct ieee80211_tx_data tx
;
1426 if (ieee80211_tx_prepare(sdata
, &tx
, skb
) == TX_DROP
)
1430 info
->control
.vif
= vif
;
1431 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1433 if (invoke_tx_handlers(&tx
))
1438 *sta
= &tx
.sta
->sta
;
1445 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1448 * Returns false if the frame couldn't be transmitted but was queued instead.
1450 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1451 struct sk_buff
*skb
, bool txpending
)
1453 struct ieee80211_local
*local
= sdata
->local
;
1454 struct ieee80211_tx_data tx
;
1455 ieee80211_tx_result res_prepare
;
1456 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1460 if (unlikely(skb
->len
< 10)) {
1465 /* initialises tx */
1467 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1469 if (unlikely(res_prepare
== TX_DROP
)) {
1470 ieee80211_free_txskb(&local
->hw
, skb
);
1472 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1476 /* set up hw_queue value early */
1477 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1478 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1480 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1482 if (!invoke_tx_handlers(&tx
))
1483 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1489 /* device xmit handlers */
1491 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1492 struct sk_buff
*skb
,
1493 int head_need
, bool may_encrypt
)
1495 struct ieee80211_local
*local
= sdata
->local
;
1498 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1499 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1500 tail_need
-= skb_tailroom(skb
);
1501 tail_need
= max_t(int, tail_need
, 0);
1504 if (skb_cloned(skb
) &&
1505 (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_CLONED_SKBS
) ||
1506 !skb_clone_writable(skb
, ETH_HLEN
) ||
1507 sdata
->crypto_tx_tailroom_needed_cnt
))
1508 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1509 else if (head_need
|| tail_need
)
1510 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1514 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1515 wiphy_debug(local
->hw
.wiphy
,
1516 "failed to reallocate TX buffer\n");
1523 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1525 struct ieee80211_local
*local
= sdata
->local
;
1526 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1527 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1531 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1533 headroom
= local
->tx_headroom
;
1535 headroom
+= sdata
->encrypt_headroom
;
1536 headroom
-= skb_headroom(skb
);
1537 headroom
= max_t(int, 0, headroom
);
1539 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1540 ieee80211_free_txskb(&local
->hw
, skb
);
1544 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1545 info
->control
.vif
= &sdata
->vif
;
1547 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1548 if (ieee80211_is_data(hdr
->frame_control
) &&
1549 is_unicast_ether_addr(hdr
->addr1
)) {
1550 if (mesh_nexthop_resolve(sdata
, skb
))
1551 return; /* skb queued: don't free */
1553 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1557 ieee80211_set_qos_hdr(sdata
, skb
);
1558 ieee80211_tx(sdata
, skb
, false);
1561 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1563 struct ieee80211_radiotap_iterator iterator
;
1564 struct ieee80211_radiotap_header
*rthdr
=
1565 (struct ieee80211_radiotap_header
*) skb
->data
;
1566 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1567 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1571 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1572 IEEE80211_TX_CTL_DONTFRAG
;
1575 * for every radiotap entry that is present
1576 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1577 * entries present, or -EINVAL on error)
1581 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1586 /* see if this argument is something we can use */
1587 switch (iterator
.this_arg_index
) {
1589 * You must take care when dereferencing iterator.this_arg
1590 * for multibyte types... the pointer is not aligned. Use
1591 * get_unaligned((type *)iterator.this_arg) to dereference
1592 * iterator.this_arg for type "type" safely on all arches.
1594 case IEEE80211_RADIOTAP_FLAGS
:
1595 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1597 * this indicates that the skb we have been
1598 * handed has the 32-bit FCS CRC at the end...
1599 * we should react to that by snipping it off
1600 * because it will be recomputed and added
1603 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1606 skb_trim(skb
, skb
->len
- FCS_LEN
);
1608 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1609 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1610 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1611 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1614 case IEEE80211_RADIOTAP_TX_FLAGS
:
1615 txflags
= get_unaligned_le16(iterator
.this_arg
);
1616 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1617 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1621 * Please update the file
1622 * Documentation/networking/mac80211-injection.txt
1623 * when parsing new fields here.
1631 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1635 * remove the radiotap header
1636 * iterator->_max_length was sanity-checked against
1637 * skb->len by iterator init
1639 skb_pull(skb
, iterator
._max_length
);
1644 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1645 struct net_device
*dev
)
1647 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1648 struct ieee80211_chanctx_conf
*chanctx_conf
;
1649 struct ieee80211_radiotap_header
*prthdr
=
1650 (struct ieee80211_radiotap_header
*)skb
->data
;
1651 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1652 struct ieee80211_hdr
*hdr
;
1653 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1654 struct cfg80211_chan_def
*chandef
;
1658 /* check for not even having the fixed radiotap header part */
1659 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1660 goto fail
; /* too short to be possibly valid */
1662 /* is it a header version we can trust to find length from? */
1663 if (unlikely(prthdr
->it_version
))
1664 goto fail
; /* only version 0 is supported */
1666 /* then there must be a radiotap header with a length we can use */
1667 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1669 /* does the skb contain enough to deliver on the alleged length? */
1670 if (unlikely(skb
->len
< len_rthdr
))
1671 goto fail
; /* skb too short for claimed rt header extent */
1674 * fix up the pointers accounting for the radiotap
1675 * header still being in there. We are being given
1676 * a precooked IEEE80211 header so no need for
1679 skb_set_mac_header(skb
, len_rthdr
);
1681 * these are just fixed to the end of the rt area since we
1682 * don't have any better information and at this point, nobody cares
1684 skb_set_network_header(skb
, len_rthdr
);
1685 skb_set_transport_header(skb
, len_rthdr
);
1687 if (skb
->len
< len_rthdr
+ 2)
1690 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1691 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1693 if (skb
->len
< len_rthdr
+ hdrlen
)
1697 * Initialize skb->protocol if the injected frame is a data frame
1698 * carrying a rfc1042 header
1700 if (ieee80211_is_data(hdr
->frame_control
) &&
1701 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1702 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1704 if (ether_addr_equal(payload
, rfc1042_header
))
1705 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1709 memset(info
, 0, sizeof(*info
));
1711 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1712 IEEE80211_TX_CTL_INJECTED
;
1714 /* process and remove the injection radiotap header */
1715 if (!ieee80211_parse_tx_radiotap(skb
))
1721 * We process outgoing injected frames that have a local address
1722 * we handle as though they are non-injected frames.
1723 * This code here isn't entirely correct, the local MAC address
1724 * isn't always enough to find the interface to use; for proper
1725 * VLAN/WDS support we will need a different mechanism (which
1726 * likely isn't going to be monitor interfaces).
1728 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1730 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1731 if (!ieee80211_sdata_running(tmp_sdata
))
1733 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1734 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1735 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1737 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1743 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1744 if (!chanctx_conf
) {
1745 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1748 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1752 chandef
= &chanctx_conf
->def
;
1753 else if (!local
->use_chanctx
)
1754 chandef
= &local
->_oper_chandef
;
1759 * Frame injection is not allowed if beaconing is not allowed
1760 * or if we need radar detection. Beaconing is usually not allowed when
1761 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1762 * Passive scan is also used in world regulatory domains where
1763 * your country is not known and as such it should be treated as
1764 * NO TX unless the channel is explicitly allowed in which case
1765 * your current regulatory domain would not have the passive scan
1768 * Since AP mode uses monitor interfaces to inject/TX management
1769 * frames we can make AP mode the exception to this rule once it
1770 * supports radar detection as its implementation can deal with
1771 * radar detection by itself. We can do that later by adding a
1772 * monitor flag interfaces used for AP support.
1774 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
1778 info
->band
= chandef
->chan
->band
;
1779 ieee80211_xmit(sdata
, skb
);
1782 return NETDEV_TX_OK
;
1788 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1792 * Measure Tx frame arrival time for Tx latency statistics calculation
1793 * A single Tx frame latency should be measured from when it is entering the
1794 * Kernel until we receive Tx complete confirmation indication and the skb is
1797 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local
*local
,
1798 struct sk_buff
*skb
)
1800 struct ieee80211_tx_latency_bin_ranges
*tx_latency
;
1802 tx_latency
= rcu_dereference(local
->tx_latency
);
1805 skb
->tstamp
= ktime_get();
1809 * ieee80211_build_hdr - build 802.11 header in the given frame
1810 * @sdata: virtual interface to build the header for
1811 * @skb: the skb to build the header in
1812 * @info_flags: skb flags to set
1814 * This function takes the skb with 802.3 header and reformats the header to
1815 * the appropriate IEEE 802.11 header based on which interface the packet is
1816 * being transmitted on.
1818 * Note that this function also takes care of the TX status request and
1819 * potential unsharing of the SKB - this needs to be interleaved with the
1822 * The function requires the read-side RCU lock held
1824 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1826 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
1827 struct sk_buff
*skb
, u32 info_flags
)
1829 struct ieee80211_local
*local
= sdata
->local
;
1830 struct ieee80211_tx_info
*info
;
1832 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1834 struct ieee80211_hdr hdr
;
1835 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1836 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1837 const u8
*encaps_data
;
1838 int encaps_len
, skip_header_bytes
;
1840 struct sta_info
*sta
= NULL
;
1841 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1842 bool tdls_peer
= false, tdls_setup_frame
= false;
1845 struct ieee80211_chanctx_conf
*chanctx_conf
;
1846 struct ieee80211_sub_if_data
*ap_sdata
;
1847 enum ieee80211_band band
;
1850 /* convert Ethernet header to proper 802.11 header (based on
1851 * operation mode) */
1852 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1853 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1855 switch (sdata
->vif
.type
) {
1856 case NL80211_IFTYPE_AP_VLAN
:
1857 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1859 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1861 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1862 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1863 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1864 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1866 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1867 wme_sta
= sta
->sta
.wme
;
1869 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1871 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1872 if (!chanctx_conf
) {
1876 band
= chanctx_conf
->def
.chan
->band
;
1880 case NL80211_IFTYPE_AP
:
1881 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1882 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1883 if (!chanctx_conf
) {
1887 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1889 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1890 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1891 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1893 band
= chanctx_conf
->def
.chan
->band
;
1895 case NL80211_IFTYPE_WDS
:
1896 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1898 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1899 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1900 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1901 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1904 * This is the exception! WDS style interfaces are prohibited
1905 * when channel contexts are in used so this must be valid
1907 band
= local
->hw
.conf
.chandef
.chan
->band
;
1909 #ifdef CONFIG_MAC80211_MESH
1910 case NL80211_IFTYPE_MESH_POINT
:
1911 if (!is_multicast_ether_addr(skb
->data
)) {
1912 struct sta_info
*next_hop
;
1913 bool mpp_lookup
= true;
1915 mpath
= mesh_path_lookup(sdata
, skb
->data
);
1918 next_hop
= rcu_dereference(mpath
->next_hop
);
1920 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
1921 MESH_PATH_RESOLVING
)))
1926 mppath
= mpp_path_lookup(sdata
, skb
->data
);
1928 if (mppath
&& mpath
)
1929 mesh_path_del(mpath
->sdata
, mpath
->dst
);
1933 * Use address extension if it is a packet from
1934 * another interface or if we know the destination
1935 * is being proxied by a portal (i.e. portal address
1936 * differs from proxied address)
1938 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1939 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1940 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1941 skb
->data
, skb
->data
+ ETH_ALEN
);
1942 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
1945 /* DS -> MBSS (802.11-2012 13.11.3.3).
1946 * For unicast with unknown forwarding information,
1947 * destination might be in the MBSS or if that fails
1948 * forwarded to another mesh gate. In either case
1949 * resolution will be handled in ieee80211_xmit(), so
1950 * leave the original DA. This also works for mcast */
1951 const u8
*mesh_da
= skb
->data
;
1954 mesh_da
= mppath
->mpp
;
1956 mesh_da
= mpath
->dst
;
1958 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1959 mesh_da
, sdata
->vif
.addr
);
1960 if (is_multicast_ether_addr(mesh_da
))
1961 /* DA TA mSA AE:SA */
1962 meshhdrlen
= ieee80211_new_mesh_header(
1964 skb
->data
+ ETH_ALEN
, NULL
);
1966 /* RA TA mDA mSA AE:DA SA */
1967 meshhdrlen
= ieee80211_new_mesh_header(
1968 sdata
, &mesh_hdr
, skb
->data
,
1969 skb
->data
+ ETH_ALEN
);
1972 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1973 if (!chanctx_conf
) {
1977 band
= chanctx_conf
->def
.chan
->band
;
1980 case NL80211_IFTYPE_STATION
:
1981 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1982 sta
= sta_info_get(sdata
, skb
->data
);
1984 authorized
= test_sta_flag(sta
,
1985 WLAN_STA_AUTHORIZED
);
1986 wme_sta
= sta
->sta
.wme
;
1987 tdls_peer
= test_sta_flag(sta
,
1988 WLAN_STA_TDLS_PEER
);
1989 tdls_auth
= test_sta_flag(sta
,
1990 WLAN_STA_TDLS_PEER_AUTH
);
1995 ethertype
== ETH_P_TDLS
&&
1997 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
2001 * TDLS link during setup - throw out frames to peer. We allow
2002 * TDLS-setup frames to unauthorized peers for the special case
2003 * of a link teardown after a TDLS sta is removed due to being
2006 if (tdls_peer
&& !tdls_auth
&& !tdls_setup_frame
) {
2011 /* send direct packets to authorized TDLS peers */
2012 if (tdls_peer
&& tdls_auth
) {
2014 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2015 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2016 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2018 } else if (sdata
->u
.mgd
.use_4addr
&&
2019 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2020 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2021 IEEE80211_FCTL_TODS
);
2023 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2024 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2025 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2026 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2029 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2031 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2032 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2033 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2036 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2037 if (!chanctx_conf
) {
2041 band
= chanctx_conf
->def
.chan
->band
;
2043 case NL80211_IFTYPE_OCB
:
2045 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2046 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2047 eth_broadcast_addr(hdr
.addr3
);
2049 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2050 if (!chanctx_conf
) {
2054 band
= chanctx_conf
->def
.chan
->band
;
2056 case NL80211_IFTYPE_ADHOC
:
2058 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2059 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2060 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2062 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2063 if (!chanctx_conf
) {
2067 band
= chanctx_conf
->def
.chan
->band
;
2075 * There's no need to try to look up the destination
2076 * if it is a multicast address (which can only happen
2079 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2081 sta
= sta_info_get(sdata
, hdr
.addr1
);
2083 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2084 wme_sta
= sta
->sta
.wme
;
2088 /* For mesh, the use of the QoS header is mandatory */
2089 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2092 /* receiver and we are QoS enabled, use a QoS type frame */
2093 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
2094 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2099 * Drop unicast frames to unauthorised stations unless they are
2100 * EAPOL frames from the local station.
2102 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2103 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2104 !multicast
&& !authorized
&&
2105 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2106 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2107 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2108 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2109 sdata
->name
, hdr
.addr1
);
2112 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2118 if (unlikely(!multicast
&& skb
->sk
&&
2119 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2120 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2123 unsigned long flags
;
2126 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2127 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2128 1, 0x10000, GFP_ATOMIC
);
2129 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2133 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2141 * If the skb is shared we need to obtain our own copy.
2143 if (skb_shared(skb
)) {
2144 struct sk_buff
*tmp_skb
= skb
;
2146 /* can't happen -- skb is a clone if info_id != 0 */
2149 skb
= skb_clone(skb
, GFP_ATOMIC
);
2158 hdr
.frame_control
= fc
;
2159 hdr
.duration_id
= 0;
2162 skip_header_bytes
= ETH_HLEN
;
2163 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2164 encaps_data
= bridge_tunnel_header
;
2165 encaps_len
= sizeof(bridge_tunnel_header
);
2166 skip_header_bytes
-= 2;
2167 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2168 encaps_data
= rfc1042_header
;
2169 encaps_len
= sizeof(rfc1042_header
);
2170 skip_header_bytes
-= 2;
2176 nh_pos
= skb_network_header(skb
) - skb
->data
;
2177 h_pos
= skb_transport_header(skb
) - skb
->data
;
2179 skb_pull(skb
, skip_header_bytes
);
2180 nh_pos
-= skip_header_bytes
;
2181 h_pos
-= skip_header_bytes
;
2183 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2186 * So we need to modify the skb header and hence need a copy of
2187 * that. The head_need variable above doesn't, so far, include
2188 * the needed header space that we don't need right away. If we
2189 * can, then we don't reallocate right now but only after the
2190 * frame arrives at the master device (if it does...)
2192 * If we cannot, however, then we will reallocate to include all
2193 * the ever needed space. Also, if we need to reallocate it anyway,
2194 * make it big enough for everything we may ever need.
2197 if (head_need
> 0 || skb_cloned(skb
)) {
2198 head_need
+= sdata
->encrypt_headroom
;
2199 head_need
+= local
->tx_headroom
;
2200 head_need
= max_t(int, 0, head_need
);
2201 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2202 ieee80211_free_txskb(&local
->hw
, skb
);
2204 return ERR_PTR(-ENOMEM
);
2209 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2210 nh_pos
+= encaps_len
;
2211 h_pos
+= encaps_len
;
2214 #ifdef CONFIG_MAC80211_MESH
2215 if (meshhdrlen
> 0) {
2216 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2217 nh_pos
+= meshhdrlen
;
2218 h_pos
+= meshhdrlen
;
2222 if (ieee80211_is_data_qos(fc
)) {
2223 __le16
*qos_control
;
2225 qos_control
= (__le16
*) skb_push(skb
, 2);
2226 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2228 * Maybe we could actually set some fields here, for now just
2229 * initialise to zero to indicate no special operation.
2233 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2238 /* Update skb pointers to various headers since this modified frame
2239 * is going to go through Linux networking code that may potentially
2240 * need things like pointer to IP header. */
2241 skb_set_mac_header(skb
, 0);
2242 skb_set_network_header(skb
, nh_pos
);
2243 skb_set_transport_header(skb
, h_pos
);
2245 info
= IEEE80211_SKB_CB(skb
);
2246 memset(info
, 0, sizeof(*info
));
2248 info
->flags
= info_flags
;
2249 info
->ack_frame_id
= info_id
;
2255 return ERR_PTR(ret
);
2258 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2259 struct net_device
*dev
,
2262 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2263 struct ieee80211_local
*local
= sdata
->local
;
2265 if (unlikely(skb
->len
< ETH_HLEN
)) {
2272 /* Measure frame arrival for Tx latency statistics calculation */
2273 ieee80211_tx_latency_start_msrmnt(local
, skb
);
2275 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
);
2279 dev
->stats
.tx_packets
++;
2280 dev
->stats
.tx_bytes
+= skb
->len
;
2281 dev
->trans_start
= jiffies
;
2283 ieee80211_xmit(sdata
, skb
);
2289 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2290 * @skb: packet to be sent
2291 * @dev: incoming interface
2293 * On failure skb will be freed.
2295 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2296 struct net_device
*dev
)
2298 __ieee80211_subif_start_xmit(skb
, dev
, 0);
2299 return NETDEV_TX_OK
;
2303 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
2304 struct sk_buff
*skb
, u32 info_flags
)
2306 struct ieee80211_hdr
*hdr
;
2307 struct ieee80211_tx_data tx
= {
2308 .local
= sdata
->local
,
2314 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
);
2318 hdr
= (void *)skb
->data
;
2319 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
2322 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
2325 return ERR_PTR(-EINVAL
);
2334 * ieee80211_clear_tx_pending may not be called in a context where
2335 * it is possible that it packets could come in again.
2337 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2339 struct sk_buff
*skb
;
2342 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2343 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2344 ieee80211_free_txskb(&local
->hw
, skb
);
2349 * Returns false if the frame couldn't be transmitted but was queued instead,
2350 * which in this case means re-queued -- take as an indication to stop sending
2351 * more pending frames.
2353 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2354 struct sk_buff
*skb
)
2356 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2357 struct ieee80211_sub_if_data
*sdata
;
2358 struct sta_info
*sta
;
2359 struct ieee80211_hdr
*hdr
;
2361 struct ieee80211_chanctx_conf
*chanctx_conf
;
2363 sdata
= vif_to_sdata(info
->control
.vif
);
2365 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2366 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2367 if (unlikely(!chanctx_conf
)) {
2371 info
->band
= chanctx_conf
->def
.chan
->band
;
2372 result
= ieee80211_tx(sdata
, skb
, true);
2374 struct sk_buff_head skbs
;
2376 __skb_queue_head_init(&skbs
);
2377 __skb_queue_tail(&skbs
, skb
);
2379 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2380 sta
= sta_info_get(sdata
, hdr
->addr1
);
2382 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2389 * Transmit all pending packets. Called from tasklet.
2391 void ieee80211_tx_pending(unsigned long data
)
2393 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2394 unsigned long flags
;
2400 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2401 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2403 * If queue is stopped by something other than due to pending
2404 * frames, or we have no pending frames, proceed to next queue.
2406 if (local
->queue_stop_reasons
[i
] ||
2407 skb_queue_empty(&local
->pending
[i
]))
2410 while (!skb_queue_empty(&local
->pending
[i
])) {
2411 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2412 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2414 if (WARN_ON(!info
->control
.vif
)) {
2415 ieee80211_free_txskb(&local
->hw
, skb
);
2419 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2422 txok
= ieee80211_tx_pending_skb(local
, skb
);
2423 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2429 if (skb_queue_empty(&local
->pending
[i
]))
2430 ieee80211_propagate_queue_wake(local
, i
);
2432 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2437 /* functions for drivers to get certain frames */
2439 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2440 struct ps_data
*ps
, struct sk_buff
*skb
,
2445 int i
, have_bits
= 0, n1
, n2
;
2447 /* Generate bitmap for TIM only if there are any STAs in power save
2449 if (atomic_read(&ps
->num_sta_ps
) > 0)
2450 /* in the hope that this is faster than
2451 * checking byte-for-byte */
2452 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
2453 IEEE80211_MAX_AID
+1);
2455 if (ps
->dtim_count
== 0)
2456 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2461 tim
= pos
= (u8
*) skb_put(skb
, 6);
2462 *pos
++ = WLAN_EID_TIM
;
2464 *pos
++ = ps
->dtim_count
;
2465 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2467 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2470 ps
->dtim_bc_mc
= aid0
== 1;
2473 /* Find largest even number N1 so that bits numbered 1 through
2474 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2475 * (N2 + 1) x 8 through 2007 are 0. */
2477 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2484 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2491 /* Bitmap control */
2493 /* Part Virt Bitmap */
2494 skb_put(skb
, n2
- n1
);
2495 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2497 tim
[1] = n2
- n1
+ 4;
2499 *pos
++ = aid0
; /* Bitmap control */
2500 *pos
++ = 0; /* Part Virt Bitmap */
2504 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2505 struct ps_data
*ps
, struct sk_buff
*skb
,
2508 struct ieee80211_local
*local
= sdata
->local
;
2511 * Not very nice, but we want to allow the driver to call
2512 * ieee80211_beacon_get() as a response to the set_tim()
2513 * callback. That, however, is already invoked under the
2514 * sta_lock to guarantee consistent and race-free update
2515 * of the tim bitmap in mac80211 and the driver.
2517 if (local
->tim_in_locked_section
) {
2518 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
2520 spin_lock_bh(&local
->tim_lock
);
2521 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
2522 spin_unlock_bh(&local
->tim_lock
);
2528 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
2529 struct beacon_data
*beacon
)
2531 struct probe_resp
*resp
;
2533 size_t beacon_data_len
;
2535 u8 count
= beacon
->csa_current_counter
;
2537 switch (sdata
->vif
.type
) {
2538 case NL80211_IFTYPE_AP
:
2539 beacon_data
= beacon
->tail
;
2540 beacon_data_len
= beacon
->tail_len
;
2542 case NL80211_IFTYPE_ADHOC
:
2543 beacon_data
= beacon
->head
;
2544 beacon_data_len
= beacon
->head_len
;
2546 case NL80211_IFTYPE_MESH_POINT
:
2547 beacon_data
= beacon
->head
;
2548 beacon_data_len
= beacon
->head_len
;
2555 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
2556 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
2558 if (beacon
->csa_counter_offsets
[i
]) {
2559 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
2565 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
2568 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
2569 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
2574 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
2576 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2577 struct beacon_data
*beacon
= NULL
;
2582 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2583 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
2584 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2585 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
2586 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
2587 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
2592 beacon
->csa_current_counter
--;
2594 /* the counter should never reach 0 */
2595 WARN_ON_ONCE(!beacon
->csa_current_counter
);
2596 count
= beacon
->csa_current_counter
;
2602 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
2604 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
2606 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2607 struct beacon_data
*beacon
= NULL
;
2609 size_t beacon_data_len
;
2612 if (!ieee80211_sdata_running(sdata
))
2616 if (vif
->type
== NL80211_IFTYPE_AP
) {
2617 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2619 beacon
= rcu_dereference(ap
->beacon
);
2620 if (WARN_ON(!beacon
|| !beacon
->tail
))
2622 beacon_data
= beacon
->tail
;
2623 beacon_data_len
= beacon
->tail_len
;
2624 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
2625 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2627 beacon
= rcu_dereference(ifibss
->presp
);
2631 beacon_data
= beacon
->head
;
2632 beacon_data_len
= beacon
->head_len
;
2633 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
2634 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2636 beacon
= rcu_dereference(ifmsh
->beacon
);
2640 beacon_data
= beacon
->head
;
2641 beacon_data_len
= beacon
->head_len
;
2647 if (!beacon
->csa_counter_offsets
[0])
2650 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
2653 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
2660 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
2662 static struct sk_buff
*
2663 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
2664 struct ieee80211_vif
*vif
,
2665 struct ieee80211_mutable_offsets
*offs
,
2668 struct ieee80211_local
*local
= hw_to_local(hw
);
2669 struct beacon_data
*beacon
= NULL
;
2670 struct sk_buff
*skb
= NULL
;
2671 struct ieee80211_tx_info
*info
;
2672 struct ieee80211_sub_if_data
*sdata
= NULL
;
2673 enum ieee80211_band band
;
2674 struct ieee80211_tx_rate_control txrc
;
2675 struct ieee80211_chanctx_conf
*chanctx_conf
;
2676 int csa_off_base
= 0;
2680 sdata
= vif_to_sdata(vif
);
2681 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2683 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2687 memset(offs
, 0, sizeof(*offs
));
2689 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2690 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2692 beacon
= rcu_dereference(ap
->beacon
);
2694 if (beacon
->csa_counter_offsets
[0]) {
2696 ieee80211_csa_update_counter(vif
);
2698 ieee80211_set_csa(sdata
, beacon
);
2702 * headroom, head length,
2703 * tail length and maximum TIM length
2705 skb
= dev_alloc_skb(local
->tx_headroom
+
2707 beacon
->tail_len
+ 256 +
2708 local
->hw
.extra_beacon_tailroom
);
2712 skb_reserve(skb
, local
->tx_headroom
);
2713 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2716 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
2720 offs
->tim_offset
= beacon
->head_len
;
2721 offs
->tim_length
= skb
->len
- beacon
->head_len
;
2723 /* for AP the csa offsets are from tail */
2724 csa_off_base
= skb
->len
;
2728 memcpy(skb_put(skb
, beacon
->tail_len
),
2729 beacon
->tail
, beacon
->tail_len
);
2732 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2733 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2734 struct ieee80211_hdr
*hdr
;
2736 beacon
= rcu_dereference(ifibss
->presp
);
2740 if (beacon
->csa_counter_offsets
[0]) {
2742 ieee80211_csa_update_counter(vif
);
2744 ieee80211_set_csa(sdata
, beacon
);
2747 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
2748 local
->hw
.extra_beacon_tailroom
);
2751 skb_reserve(skb
, local
->tx_headroom
);
2752 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2755 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2756 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2757 IEEE80211_STYPE_BEACON
);
2758 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2759 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2761 beacon
= rcu_dereference(ifmsh
->beacon
);
2765 if (beacon
->csa_counter_offsets
[0]) {
2767 /* TODO: For mesh csa_counter is in TU, so
2768 * decrementing it by one isn't correct, but
2769 * for now we leave it consistent with overall
2770 * mac80211's behavior.
2772 ieee80211_csa_update_counter(vif
);
2774 ieee80211_set_csa(sdata
, beacon
);
2777 if (ifmsh
->sync_ops
)
2778 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
2780 skb
= dev_alloc_skb(local
->tx_headroom
+
2784 local
->hw
.extra_beacon_tailroom
);
2787 skb_reserve(skb
, local
->tx_headroom
);
2788 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2790 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
2793 offs
->tim_offset
= beacon
->head_len
;
2794 offs
->tim_length
= skb
->len
- beacon
->head_len
;
2797 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
2805 if (offs
&& beacon
) {
2808 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
2809 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
2814 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
2818 band
= chanctx_conf
->def
.chan
->band
;
2820 info
= IEEE80211_SKB_CB(skb
);
2822 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2823 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2826 memset(&txrc
, 0, sizeof(txrc
));
2828 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2829 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2831 txrc
.reported_rate
.idx
= -1;
2832 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2833 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2834 txrc
.max_rate_idx
= -1;
2836 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2838 rate_control_get_rate(sdata
, NULL
, &txrc
);
2840 info
->control
.vif
= vif
;
2842 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2843 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2844 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2852 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
2853 struct ieee80211_vif
*vif
,
2854 struct ieee80211_mutable_offsets
*offs
)
2856 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
2858 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
2860 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2861 struct ieee80211_vif
*vif
,
2862 u16
*tim_offset
, u16
*tim_length
)
2864 struct ieee80211_mutable_offsets offs
= {};
2865 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
2868 *tim_offset
= offs
.tim_offset
;
2871 *tim_length
= offs
.tim_length
;
2875 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2877 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2878 struct ieee80211_vif
*vif
)
2880 struct ieee80211_if_ap
*ap
= NULL
;
2881 struct sk_buff
*skb
= NULL
;
2882 struct probe_resp
*presp
= NULL
;
2883 struct ieee80211_hdr
*hdr
;
2884 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2886 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2892 presp
= rcu_dereference(ap
->probe_resp
);
2896 skb
= dev_alloc_skb(presp
->len
);
2900 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2902 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2903 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2909 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2911 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2912 struct ieee80211_vif
*vif
)
2914 struct ieee80211_sub_if_data
*sdata
;
2915 struct ieee80211_if_managed
*ifmgd
;
2916 struct ieee80211_pspoll
*pspoll
;
2917 struct ieee80211_local
*local
;
2918 struct sk_buff
*skb
;
2920 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2923 sdata
= vif_to_sdata(vif
);
2924 ifmgd
= &sdata
->u
.mgd
;
2925 local
= sdata
->local
;
2927 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2931 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2933 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2934 memset(pspoll
, 0, sizeof(*pspoll
));
2935 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2936 IEEE80211_STYPE_PSPOLL
);
2937 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2939 /* aid in PS-Poll has its two MSBs each set to 1 */
2940 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2942 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2943 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2947 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2949 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2950 struct ieee80211_vif
*vif
)
2952 struct ieee80211_hdr_3addr
*nullfunc
;
2953 struct ieee80211_sub_if_data
*sdata
;
2954 struct ieee80211_if_managed
*ifmgd
;
2955 struct ieee80211_local
*local
;
2956 struct sk_buff
*skb
;
2958 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2961 sdata
= vif_to_sdata(vif
);
2962 ifmgd
= &sdata
->u
.mgd
;
2963 local
= sdata
->local
;
2965 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2969 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2971 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2973 memset(nullfunc
, 0, sizeof(*nullfunc
));
2974 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2975 IEEE80211_STYPE_NULLFUNC
|
2976 IEEE80211_FCTL_TODS
);
2977 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2978 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2979 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2983 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2985 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2987 const u8
*ssid
, size_t ssid_len
,
2990 struct ieee80211_local
*local
= hw_to_local(hw
);
2991 struct ieee80211_hdr_3addr
*hdr
;
2992 struct sk_buff
*skb
;
2996 ie_ssid_len
= 2 + ssid_len
;
2998 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2999 ie_ssid_len
+ tailroom
);
3003 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3005 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
3006 memset(hdr
, 0, sizeof(*hdr
));
3007 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3008 IEEE80211_STYPE_PROBE_REQ
);
3009 eth_broadcast_addr(hdr
->addr1
);
3010 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
3011 eth_broadcast_addr(hdr
->addr3
);
3013 pos
= skb_put(skb
, ie_ssid_len
);
3014 *pos
++ = WLAN_EID_SSID
;
3017 memcpy(pos
, ssid
, ssid_len
);
3022 EXPORT_SYMBOL(ieee80211_probereq_get
);
3024 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3025 const void *frame
, size_t frame_len
,
3026 const struct ieee80211_tx_info
*frame_txctl
,
3027 struct ieee80211_rts
*rts
)
3029 const struct ieee80211_hdr
*hdr
= frame
;
3031 rts
->frame_control
=
3032 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
3033 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
3035 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
3036 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
3038 EXPORT_SYMBOL(ieee80211_rts_get
);
3040 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3041 const void *frame
, size_t frame_len
,
3042 const struct ieee80211_tx_info
*frame_txctl
,
3043 struct ieee80211_cts
*cts
)
3045 const struct ieee80211_hdr
*hdr
= frame
;
3047 cts
->frame_control
=
3048 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
3049 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
3050 frame_len
, frame_txctl
);
3051 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
3053 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
3056 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
3057 struct ieee80211_vif
*vif
)
3059 struct ieee80211_local
*local
= hw_to_local(hw
);
3060 struct sk_buff
*skb
= NULL
;
3061 struct ieee80211_tx_data tx
;
3062 struct ieee80211_sub_if_data
*sdata
;
3064 struct ieee80211_tx_info
*info
;
3065 struct ieee80211_chanctx_conf
*chanctx_conf
;
3067 sdata
= vif_to_sdata(vif
);
3070 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3075 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3076 struct beacon_data
*beacon
=
3077 rcu_dereference(sdata
->u
.ap
.beacon
);
3079 if (!beacon
|| !beacon
->head
)
3082 ps
= &sdata
->u
.ap
.ps
;
3083 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3084 ps
= &sdata
->u
.mesh
.ps
;
3089 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
3090 goto out
; /* send buffered bc/mc only after DTIM beacon */
3093 skb
= skb_dequeue(&ps
->bc_buf
);
3096 local
->total_ps_buffered
--;
3098 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
3099 struct ieee80211_hdr
*hdr
=
3100 (struct ieee80211_hdr
*) skb
->data
;
3101 /* more buffered multicast/broadcast frames ==> set
3102 * MoreData flag in IEEE 802.11 header to inform PS
3104 hdr
->frame_control
|=
3105 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
3108 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3109 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
3110 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
3112 dev_kfree_skb_any(skb
);
3115 info
= IEEE80211_SKB_CB(skb
);
3117 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
3118 info
->band
= chanctx_conf
->def
.chan
->band
;
3120 if (invoke_tx_handlers(&tx
))
3127 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
3129 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3131 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3132 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3133 struct ieee80211_local
*local
= sdata
->local
;
3137 lockdep_assert_held(&local
->sta_mtx
);
3139 /* only some cases are supported right now */
3140 switch (sdata
->vif
.type
) {
3141 case NL80211_IFTYPE_STATION
:
3142 case NL80211_IFTYPE_AP
:
3143 case NL80211_IFTYPE_AP_VLAN
:
3150 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
3153 if (sta
->reserved_tid
== tid
) {
3158 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
3159 sdata_err(sdata
, "TID reservation already active\n");
3164 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
3165 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3169 /* Tear down BA sessions so we stop aggregating on this TID */
3170 if (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) {
3171 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3172 __ieee80211_stop_tx_ba_session(sta
, tid
,
3173 AGG_STOP_LOCAL_REQUEST
);
3176 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
3177 __ieee80211_flush_queues(local
, sdata
, queues
, false);
3179 sta
->reserved_tid
= tid
;
3181 ieee80211_wake_vif_queues(local
, sdata
,
3182 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3184 if (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)
3185 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3191 EXPORT_SYMBOL(ieee80211_reserve_tid
);
3193 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3195 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3196 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3198 lockdep_assert_held(&sdata
->local
->sta_mtx
);
3200 /* only some cases are supported right now */
3201 switch (sdata
->vif
.type
) {
3202 case NL80211_IFTYPE_STATION
:
3203 case NL80211_IFTYPE_AP
:
3204 case NL80211_IFTYPE_AP_VLAN
:
3211 if (tid
!= sta
->reserved_tid
) {
3212 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
3216 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
3218 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
3220 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
3221 struct sk_buff
*skb
, int tid
,
3222 enum ieee80211_band band
)
3224 int ac
= ieee802_1d_to_ac
[tid
& 7];
3226 skb_set_mac_header(skb
, 0);
3227 skb_set_network_header(skb
, 0);
3228 skb_set_transport_header(skb
, 0);
3230 skb_set_queue_mapping(skb
, ac
);
3231 skb
->priority
= tid
;
3233 skb
->dev
= sdata
->dev
;
3236 * The other path calling ieee80211_xmit is from the tasklet,
3237 * and while we can handle concurrent transmissions locking
3238 * requirements are that we do not come into tx with bhs on.
3241 IEEE80211_SKB_CB(skb
)->band
= band
;
3242 ieee80211_xmit(sdata
, skb
);