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
;
574 static ieee80211_tx_result debug_noinline
575 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
577 struct ieee80211_key
*key
;
578 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
579 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
581 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
584 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
586 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
587 is_multicast_ether_addr(hdr
->addr1
) &&
588 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
589 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
591 else if (is_multicast_ether_addr(hdr
->addr1
) &&
592 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
594 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
595 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
597 else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
)
599 else if (!tx
->sdata
->drop_unencrypted
)
601 else if (tx
->skb
->protocol
== tx
->sdata
->control_port_protocol
)
603 else if (ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
604 !(ieee80211_is_action(hdr
->frame_control
) &&
605 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))
607 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
608 !ieee80211_is_robust_mgmt_frame(tx
->skb
))
611 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
616 bool skip_hw
= false;
618 tx
->key
->tx_rx_count
++;
619 /* TODO: add threshold stuff again */
621 switch (tx
->key
->conf
.cipher
) {
622 case WLAN_CIPHER_SUITE_WEP40
:
623 case WLAN_CIPHER_SUITE_WEP104
:
624 case WLAN_CIPHER_SUITE_TKIP
:
625 if (!ieee80211_is_data_present(hdr
->frame_control
))
628 case WLAN_CIPHER_SUITE_CCMP
:
629 case WLAN_CIPHER_SUITE_CCMP_256
:
630 case WLAN_CIPHER_SUITE_GCMP
:
631 case WLAN_CIPHER_SUITE_GCMP_256
:
632 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
633 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
637 skip_hw
= (tx
->key
->conf
.flags
&
638 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
639 ieee80211_is_mgmt(hdr
->frame_control
);
641 case WLAN_CIPHER_SUITE_AES_CMAC
:
642 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
644 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
645 if (!ieee80211_is_mgmt(hdr
->frame_control
))
650 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
651 !ieee80211_is_deauth(hdr
->frame_control
)))
654 if (!skip_hw
&& tx
->key
&&
655 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
656 info
->control
.hw_key
= &tx
->key
->conf
;
662 static ieee80211_tx_result debug_noinline
663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
665 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
666 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
667 struct ieee80211_supported_band
*sband
;
669 struct ieee80211_tx_rate_control txrc
;
670 struct ieee80211_sta_rates
*ratetbl
= NULL
;
673 memset(&txrc
, 0, sizeof(txrc
));
675 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
677 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
678 tx
->local
->hw
.wiphy
->frag_threshold
);
680 /* set up the tx rate control struct we give the RC algo */
681 txrc
.hw
= &tx
->local
->hw
;
683 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
685 txrc
.reported_rate
.idx
= -1;
686 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
687 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
688 txrc
.max_rate_idx
= -1;
690 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
692 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
693 txrc
.rate_idx_mcs_mask
=
694 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
696 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
697 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
698 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
700 /* set up RTS protection if desired */
701 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
705 info
->control
.use_rts
= txrc
.rts
;
706 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
709 * Use short preamble if the BSS can handle it, but not for
710 * management frames unless we know the receiver can handle
711 * that -- the management frame might be to a station that
712 * just wants a probe response.
714 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
715 (ieee80211_is_data(hdr
->frame_control
) ||
716 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
717 txrc
.short_preamble
= true;
719 info
->control
.short_preamble
= txrc
.short_preamble
;
722 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
725 * Lets not bother rate control if we're associated and cannot
726 * talk to the sta. This should not happen.
728 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
729 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
730 "%s: Dropped data frame as no usable bitrate found while "
731 "scanning and associated. Target station: "
732 "%pM on %d GHz band\n",
733 tx
->sdata
->name
, hdr
->addr1
,
738 * If we're associated with the sta at this point we know we can at
739 * least send the frame at the lowest bit rate.
741 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
743 if (tx
->sta
&& !info
->control
.skip_table
)
744 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
746 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
748 struct ieee80211_tx_rate rate
= {
749 .idx
= ratetbl
->rate
[0].idx
,
750 .flags
= ratetbl
->rate
[0].flags
,
751 .count
= ratetbl
->rate
[0].count
754 if (ratetbl
->rate
[0].idx
< 0)
762 tx
->rate
= info
->control
.rates
[0];
765 if (txrc
.reported_rate
.idx
< 0) {
766 txrc
.reported_rate
= tx
->rate
;
767 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
768 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
770 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
775 if (unlikely(!info
->control
.rates
[0].count
))
776 info
->control
.rates
[0].count
= 1;
778 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
779 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
780 info
->control
.rates
[0].count
= 1;
785 static ieee80211_tx_result debug_noinline
786 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
788 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
789 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
795 * Packet injection may want to control the sequence
796 * number, if we have no matching interface then we
797 * neither assign one ourselves nor ask the driver to.
799 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
802 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
805 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
808 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
812 * Anything but QoS data that has a sequence number field
813 * (is long enough) gets a sequence number from the global
814 * counter. QoS data frames with a multicast destination
815 * also use the global counter (802.11-2012 9.3.2.10).
817 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
818 is_multicast_ether_addr(hdr
->addr1
)) {
819 /* driver should assign sequence number */
820 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
821 /* for pure STA mode without beacons, we can do it */
822 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
823 tx
->sdata
->sequence_number
+= 0x10;
825 tx
->sta
->tx_msdu
[IEEE80211_NUM_TIDS
]++;
830 * This should be true for injected/management frames only, for
831 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
832 * above since they are not QoS-data frames.
837 /* include per-STA, per-TID sequence counter */
839 qc
= ieee80211_get_qos_ctl(hdr
);
840 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
841 seq
= &tx
->sta
->tid_seq
[tid
];
842 tx
->sta
->tx_msdu
[tid
]++;
844 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
846 /* Increase the sequence number. */
847 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
852 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
853 struct sk_buff
*skb
, int hdrlen
,
856 struct ieee80211_local
*local
= tx
->local
;
857 struct ieee80211_tx_info
*info
;
859 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
860 int pos
= hdrlen
+ per_fragm
;
861 int rem
= skb
->len
- hdrlen
- per_fragm
;
863 if (WARN_ON(rem
< 0))
866 /* first fragment was already added to queue by caller */
869 int fraglen
= per_fragm
;
874 tmp
= dev_alloc_skb(local
->tx_headroom
+
876 tx
->sdata
->encrypt_headroom
+
877 IEEE80211_ENCRYPT_TAILROOM
);
881 __skb_queue_tail(&tx
->skbs
, tmp
);
884 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
886 /* copy control information */
887 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
889 info
= IEEE80211_SKB_CB(tmp
);
890 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
891 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
894 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
896 skb_copy_queue_mapping(tmp
, skb
);
897 tmp
->priority
= skb
->priority
;
900 /* copy header and data */
901 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
902 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
907 /* adjust first fragment's length */
908 skb_trim(skb
, hdrlen
+ per_fragm
);
912 static ieee80211_tx_result debug_noinline
913 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
915 struct sk_buff
*skb
= tx
->skb
;
916 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
917 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
918 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
922 /* no matter what happens, tx->skb moves to tx->skbs */
923 __skb_queue_tail(&tx
->skbs
, skb
);
926 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
929 if (tx
->local
->ops
->set_frag_threshold
)
933 * Warn when submitting a fragmented A-MPDU frame and drop it.
934 * This scenario is handled in ieee80211_tx_prepare but extra
935 * caution taken here as fragmented ampdu may cause Tx stop.
937 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
940 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
942 /* internal error, why isn't DONTFRAG set? */
943 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
947 * Now fragment the frame. This will allocate all the fragments and
948 * chain them (using skb as the first fragment) to skb->next.
949 * During transmission, we will remove the successfully transmitted
950 * fragments from this list. When the low-level driver rejects one
951 * of the fragments then we will simply pretend to accept the skb
952 * but store it away as pending.
954 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
957 /* update duration/seq/flags of fragments */
960 skb_queue_walk(&tx
->skbs
, skb
) {
961 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
963 hdr
= (void *)skb
->data
;
964 info
= IEEE80211_SKB_CB(skb
);
966 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
967 hdr
->frame_control
|= morefrags
;
969 * No multi-rate retries for fragmented frames, that
970 * would completely throw off the NAV at other STAs.
972 info
->control
.rates
[1].idx
= -1;
973 info
->control
.rates
[2].idx
= -1;
974 info
->control
.rates
[3].idx
= -1;
975 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
976 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
978 hdr
->frame_control
&= ~morefrags
;
980 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
987 static ieee80211_tx_result debug_noinline
988 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
996 skb_queue_walk(&tx
->skbs
, skb
) {
997 ac
= skb_get_queue_mapping(skb
);
998 tx
->sta
->tx_fragments
++;
999 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
1002 tx
->sta
->tx_packets
[ac
]++;
1007 static ieee80211_tx_result debug_noinline
1008 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1013 switch (tx
->key
->conf
.cipher
) {
1014 case WLAN_CIPHER_SUITE_WEP40
:
1015 case WLAN_CIPHER_SUITE_WEP104
:
1016 return ieee80211_crypto_wep_encrypt(tx
);
1017 case WLAN_CIPHER_SUITE_TKIP
:
1018 return ieee80211_crypto_tkip_encrypt(tx
);
1019 case WLAN_CIPHER_SUITE_CCMP
:
1020 return ieee80211_crypto_ccmp_encrypt(
1021 tx
, IEEE80211_CCMP_MIC_LEN
);
1022 case WLAN_CIPHER_SUITE_CCMP_256
:
1023 return ieee80211_crypto_ccmp_encrypt(
1024 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1025 case WLAN_CIPHER_SUITE_AES_CMAC
:
1026 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1027 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1028 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1029 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1031 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1032 case WLAN_CIPHER_SUITE_GCMP
:
1033 case WLAN_CIPHER_SUITE_GCMP_256
:
1034 return ieee80211_crypto_gcmp_encrypt(tx
);
1036 return ieee80211_crypto_hw_encrypt(tx
);
1042 static ieee80211_tx_result debug_noinline
1043 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1045 struct sk_buff
*skb
;
1046 struct ieee80211_hdr
*hdr
;
1050 skb_queue_walk(&tx
->skbs
, skb
) {
1051 hdr
= (void *) skb
->data
;
1052 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1053 break; /* must not overwrite AID */
1054 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1055 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1056 next_len
= next
->len
;
1059 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1062 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1068 /* actual transmit path */
1070 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1071 struct sk_buff
*skb
,
1072 struct ieee80211_tx_info
*info
,
1073 struct tid_ampdu_tx
*tid_tx
,
1076 bool queued
= false;
1077 bool reset_agg_timer
= false;
1078 struct sk_buff
*purge_skb
= NULL
;
1080 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1081 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1082 reset_agg_timer
= true;
1083 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1085 * nothing -- this aggregation session is being started
1086 * but that might still fail with the driver
1089 spin_lock(&tx
->sta
->lock
);
1091 * Need to re-check now, because we may get here
1093 * 1) in the window during which the setup is actually
1094 * already done, but not marked yet because not all
1095 * packets are spliced over to the driver pending
1096 * queue yet -- if this happened we acquire the lock
1097 * either before or after the splice happens, but
1098 * need to recheck which of these cases happened.
1100 * 2) during session teardown, if the OPERATIONAL bit
1101 * was cleared due to the teardown but the pointer
1102 * hasn't been assigned NULL yet (or we loaded it
1103 * before it was assigned) -- in this case it may
1104 * now be NULL which means we should just let the
1105 * packet pass through because splicing the frames
1106 * back is already done.
1108 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1111 /* do nothing, let packet pass through */
1112 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1113 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1114 reset_agg_timer
= true;
1117 info
->control
.vif
= &tx
->sdata
->vif
;
1118 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1119 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
1120 __skb_queue_tail(&tid_tx
->pending
, skb
);
1121 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1122 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1124 spin_unlock(&tx
->sta
->lock
);
1127 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1130 /* reset session timer */
1131 if (reset_agg_timer
&& tid_tx
->timeout
)
1132 tid_tx
->last_tx
= jiffies
;
1140 static ieee80211_tx_result
1141 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1142 struct ieee80211_tx_data
*tx
,
1143 struct sk_buff
*skb
)
1145 struct ieee80211_local
*local
= sdata
->local
;
1146 struct ieee80211_hdr
*hdr
;
1147 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1151 memset(tx
, 0, sizeof(*tx
));
1155 __skb_queue_head_init(&tx
->skbs
);
1158 * If this flag is set to true anywhere, and we get here,
1159 * we are doing the needed processing, so remove the flag
1162 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1164 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1166 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1167 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1168 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1170 } else if (info
->flags
& (IEEE80211_TX_CTL_INJECTED
|
1171 IEEE80211_TX_INTFL_NL80211_FRAME_TX
) ||
1172 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1173 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1176 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1178 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1179 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1180 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1181 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1182 struct tid_ampdu_tx
*tid_tx
;
1184 qc
= ieee80211_get_qos_ctl(hdr
);
1185 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1187 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1191 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1194 if (unlikely(queued
))
1199 if (is_multicast_ether_addr(hdr
->addr1
)) {
1200 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1201 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1203 tx
->flags
|= IEEE80211_TX_UNICAST
;
1205 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1206 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1207 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1208 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1209 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1213 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1214 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1215 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1217 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1222 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1223 struct ieee80211_vif
*vif
,
1224 struct ieee80211_sta
*sta
,
1225 struct sk_buff_head
*skbs
,
1228 struct ieee80211_tx_control control
;
1229 struct sk_buff
*skb
, *tmp
;
1230 unsigned long flags
;
1232 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1233 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1234 int q
= info
->hw_queue
;
1236 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1237 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1238 __skb_unlink(skb
, skbs
);
1239 ieee80211_free_txskb(&local
->hw
, skb
);
1244 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1245 if (local
->queue_stop_reasons
[q
] ||
1246 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1247 if (unlikely(info
->flags
&
1248 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1249 if (local
->queue_stop_reasons
[q
] &
1250 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1252 * Drop off-channel frames if queues
1253 * are stopped for any reason other
1254 * than off-channel operation. Never
1257 spin_unlock_irqrestore(
1258 &local
->queue_stop_reason_lock
,
1260 ieee80211_purge_tx_queue(&local
->hw
,
1267 * Since queue is stopped, queue up frames for
1268 * later transmission from the tx-pending
1269 * tasklet when the queue is woken again.
1272 skb_queue_splice_init(skbs
,
1273 &local
->pending
[q
]);
1275 skb_queue_splice_tail_init(skbs
,
1276 &local
->pending
[q
]);
1278 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1283 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1285 info
->control
.vif
= vif
;
1288 __skb_unlink(skb
, skbs
);
1289 drv_tx(local
, &control
, skb
);
1296 * Returns false if the frame couldn't be transmitted but was queued instead.
1298 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1299 struct sk_buff_head
*skbs
, int led_len
,
1300 struct sta_info
*sta
, bool txpending
)
1302 struct ieee80211_tx_info
*info
;
1303 struct ieee80211_sub_if_data
*sdata
;
1304 struct ieee80211_vif
*vif
;
1305 struct ieee80211_sta
*pubsta
;
1306 struct sk_buff
*skb
;
1310 if (WARN_ON(skb_queue_empty(skbs
)))
1313 skb
= skb_peek(skbs
);
1314 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1315 info
= IEEE80211_SKB_CB(skb
);
1316 sdata
= vif_to_sdata(info
->control
.vif
);
1317 if (sta
&& !sta
->uploaded
)
1325 switch (sdata
->vif
.type
) {
1326 case NL80211_IFTYPE_MONITOR
:
1327 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1331 sdata
= rcu_dereference(local
->monitor_sdata
);
1335 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1336 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1342 case NL80211_IFTYPE_AP_VLAN
:
1343 sdata
= container_of(sdata
->bss
,
1344 struct ieee80211_sub_if_data
, u
.ap
);
1351 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1354 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1356 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1362 * Invoke TX handlers, return 0 on success and non-zero if the
1363 * frame was dropped or queued.
1365 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1367 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1368 ieee80211_tx_result res
= TX_DROP
;
1370 #define CALL_TXH(txh) \
1373 if (res != TX_CONTINUE) \
1377 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1378 CALL_TXH(ieee80211_tx_h_check_assoc
);
1379 CALL_TXH(ieee80211_tx_h_ps_buf
);
1380 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1381 CALL_TXH(ieee80211_tx_h_select_key
);
1382 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1383 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1385 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1386 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1391 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1392 CALL_TXH(ieee80211_tx_h_sequence
);
1393 CALL_TXH(ieee80211_tx_h_fragment
);
1394 /* handlers after fragment must be aware of tx info fragmentation! */
1395 CALL_TXH(ieee80211_tx_h_stats
);
1396 CALL_TXH(ieee80211_tx_h_encrypt
);
1397 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1398 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1402 if (unlikely(res
== TX_DROP
)) {
1403 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1405 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1407 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1409 } else if (unlikely(res
== TX_QUEUED
)) {
1410 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1417 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1418 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1419 int band
, struct ieee80211_sta
**sta
)
1421 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1422 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1423 struct ieee80211_tx_data tx
;
1425 if (ieee80211_tx_prepare(sdata
, &tx
, skb
) == TX_DROP
)
1429 info
->control
.vif
= vif
;
1430 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1432 if (invoke_tx_handlers(&tx
))
1437 *sta
= &tx
.sta
->sta
;
1444 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1447 * Returns false if the frame couldn't be transmitted but was queued instead.
1449 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1450 struct sk_buff
*skb
, bool txpending
)
1452 struct ieee80211_local
*local
= sdata
->local
;
1453 struct ieee80211_tx_data tx
;
1454 ieee80211_tx_result res_prepare
;
1455 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1459 if (unlikely(skb
->len
< 10)) {
1464 /* initialises tx */
1466 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1468 if (unlikely(res_prepare
== TX_DROP
)) {
1469 ieee80211_free_txskb(&local
->hw
, skb
);
1471 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1475 /* set up hw_queue value early */
1476 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1477 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1479 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1481 if (!invoke_tx_handlers(&tx
))
1482 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1488 /* device xmit handlers */
1490 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1491 struct sk_buff
*skb
,
1492 int head_need
, bool may_encrypt
)
1494 struct ieee80211_local
*local
= sdata
->local
;
1497 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1498 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1499 tail_need
-= skb_tailroom(skb
);
1500 tail_need
= max_t(int, tail_need
, 0);
1503 if (skb_cloned(skb
) &&
1504 (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_CLONED_SKBS
) ||
1505 !skb_clone_writable(skb
, ETH_HLEN
) ||
1506 sdata
->crypto_tx_tailroom_needed_cnt
))
1507 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1508 else if (head_need
|| tail_need
)
1509 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1513 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1514 wiphy_debug(local
->hw
.wiphy
,
1515 "failed to reallocate TX buffer\n");
1522 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1524 struct ieee80211_local
*local
= sdata
->local
;
1525 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1526 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1530 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1532 headroom
= local
->tx_headroom
;
1534 headroom
+= sdata
->encrypt_headroom
;
1535 headroom
-= skb_headroom(skb
);
1536 headroom
= max_t(int, 0, headroom
);
1538 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1539 ieee80211_free_txskb(&local
->hw
, skb
);
1543 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1544 info
->control
.vif
= &sdata
->vif
;
1546 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1547 if (ieee80211_is_data(hdr
->frame_control
) &&
1548 is_unicast_ether_addr(hdr
->addr1
)) {
1549 if (mesh_nexthop_resolve(sdata
, skb
))
1550 return; /* skb queued: don't free */
1552 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1556 ieee80211_set_qos_hdr(sdata
, skb
);
1557 ieee80211_tx(sdata
, skb
, false);
1560 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1562 struct ieee80211_radiotap_iterator iterator
;
1563 struct ieee80211_radiotap_header
*rthdr
=
1564 (struct ieee80211_radiotap_header
*) skb
->data
;
1565 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1566 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1570 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1571 IEEE80211_TX_CTL_DONTFRAG
;
1574 * for every radiotap entry that is present
1575 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1576 * entries present, or -EINVAL on error)
1580 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1585 /* see if this argument is something we can use */
1586 switch (iterator
.this_arg_index
) {
1588 * You must take care when dereferencing iterator.this_arg
1589 * for multibyte types... the pointer is not aligned. Use
1590 * get_unaligned((type *)iterator.this_arg) to dereference
1591 * iterator.this_arg for type "type" safely on all arches.
1593 case IEEE80211_RADIOTAP_FLAGS
:
1594 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1596 * this indicates that the skb we have been
1597 * handed has the 32-bit FCS CRC at the end...
1598 * we should react to that by snipping it off
1599 * because it will be recomputed and added
1602 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1605 skb_trim(skb
, skb
->len
- FCS_LEN
);
1607 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1608 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1609 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1610 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1613 case IEEE80211_RADIOTAP_TX_FLAGS
:
1614 txflags
= get_unaligned_le16(iterator
.this_arg
);
1615 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1616 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1620 * Please update the file
1621 * Documentation/networking/mac80211-injection.txt
1622 * when parsing new fields here.
1630 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1634 * remove the radiotap header
1635 * iterator->_max_length was sanity-checked against
1636 * skb->len by iterator init
1638 skb_pull(skb
, iterator
._max_length
);
1643 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1644 struct net_device
*dev
)
1646 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1647 struct ieee80211_chanctx_conf
*chanctx_conf
;
1648 struct ieee80211_radiotap_header
*prthdr
=
1649 (struct ieee80211_radiotap_header
*)skb
->data
;
1650 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1651 struct ieee80211_hdr
*hdr
;
1652 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1653 struct cfg80211_chan_def
*chandef
;
1657 /* check for not even having the fixed radiotap header part */
1658 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1659 goto fail
; /* too short to be possibly valid */
1661 /* is it a header version we can trust to find length from? */
1662 if (unlikely(prthdr
->it_version
))
1663 goto fail
; /* only version 0 is supported */
1665 /* then there must be a radiotap header with a length we can use */
1666 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1668 /* does the skb contain enough to deliver on the alleged length? */
1669 if (unlikely(skb
->len
< len_rthdr
))
1670 goto fail
; /* skb too short for claimed rt header extent */
1673 * fix up the pointers accounting for the radiotap
1674 * header still being in there. We are being given
1675 * a precooked IEEE80211 header so no need for
1678 skb_set_mac_header(skb
, len_rthdr
);
1680 * these are just fixed to the end of the rt area since we
1681 * don't have any better information and at this point, nobody cares
1683 skb_set_network_header(skb
, len_rthdr
);
1684 skb_set_transport_header(skb
, len_rthdr
);
1686 if (skb
->len
< len_rthdr
+ 2)
1689 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1690 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1692 if (skb
->len
< len_rthdr
+ hdrlen
)
1696 * Initialize skb->protocol if the injected frame is a data frame
1697 * carrying a rfc1042 header
1699 if (ieee80211_is_data(hdr
->frame_control
) &&
1700 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1701 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1703 if (ether_addr_equal(payload
, rfc1042_header
))
1704 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1708 memset(info
, 0, sizeof(*info
));
1710 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1711 IEEE80211_TX_CTL_INJECTED
;
1713 /* process and remove the injection radiotap header */
1714 if (!ieee80211_parse_tx_radiotap(skb
))
1720 * We process outgoing injected frames that have a local address
1721 * we handle as though they are non-injected frames.
1722 * This code here isn't entirely correct, the local MAC address
1723 * isn't always enough to find the interface to use; for proper
1724 * VLAN/WDS support we will need a different mechanism (which
1725 * likely isn't going to be monitor interfaces).
1727 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1729 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1730 if (!ieee80211_sdata_running(tmp_sdata
))
1732 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1733 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1734 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1736 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1742 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1743 if (!chanctx_conf
) {
1744 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1747 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1751 chandef
= &chanctx_conf
->def
;
1752 else if (!local
->use_chanctx
)
1753 chandef
= &local
->_oper_chandef
;
1758 * Frame injection is not allowed if beaconing is not allowed
1759 * or if we need radar detection. Beaconing is usually not allowed when
1760 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1761 * Passive scan is also used in world regulatory domains where
1762 * your country is not known and as such it should be treated as
1763 * NO TX unless the channel is explicitly allowed in which case
1764 * your current regulatory domain would not have the passive scan
1767 * Since AP mode uses monitor interfaces to inject/TX management
1768 * frames we can make AP mode the exception to this rule once it
1769 * supports radar detection as its implementation can deal with
1770 * radar detection by itself. We can do that later by adding a
1771 * monitor flag interfaces used for AP support.
1773 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
1777 info
->band
= chandef
->chan
->band
;
1778 ieee80211_xmit(sdata
, skb
);
1781 return NETDEV_TX_OK
;
1787 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1791 * Measure Tx frame arrival time for Tx latency statistics calculation
1792 * A single Tx frame latency should be measured from when it is entering the
1793 * Kernel until we receive Tx complete confirmation indication and the skb is
1796 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local
*local
,
1797 struct sk_buff
*skb
)
1799 struct ieee80211_tx_latency_bin_ranges
*tx_latency
;
1801 tx_latency
= rcu_dereference(local
->tx_latency
);
1804 skb
->tstamp
= ktime_get();
1808 * ieee80211_build_hdr - build 802.11 header in the given frame
1809 * @sdata: virtual interface to build the header for
1810 * @skb: the skb to build the header in
1811 * @info_flags: skb flags to set
1813 * This function takes the skb with 802.3 header and reformats the header to
1814 * the appropriate IEEE 802.11 header based on which interface the packet is
1815 * being transmitted on.
1817 * Note that this function also takes care of the TX status request and
1818 * potential unsharing of the SKB - this needs to be interleaved with the
1821 * The function requires the read-side RCU lock held
1823 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1825 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
1826 struct sk_buff
*skb
, u32 info_flags
)
1828 struct ieee80211_local
*local
= sdata
->local
;
1829 struct ieee80211_tx_info
*info
;
1831 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1833 struct ieee80211_hdr hdr
;
1834 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1835 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1836 const u8
*encaps_data
;
1837 int encaps_len
, skip_header_bytes
;
1839 struct sta_info
*sta
= NULL
;
1840 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1841 bool tdls_peer
= false, tdls_setup_frame
= false;
1844 struct ieee80211_chanctx_conf
*chanctx_conf
;
1845 struct ieee80211_sub_if_data
*ap_sdata
;
1846 enum ieee80211_band band
;
1849 /* convert Ethernet header to proper 802.11 header (based on
1850 * operation mode) */
1851 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1852 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1854 switch (sdata
->vif
.type
) {
1855 case NL80211_IFTYPE_AP_VLAN
:
1856 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1858 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1860 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1861 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1862 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1863 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1865 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1866 wme_sta
= sta
->sta
.wme
;
1868 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1870 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
1871 if (!chanctx_conf
) {
1875 band
= chanctx_conf
->def
.chan
->band
;
1879 case NL80211_IFTYPE_AP
:
1880 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1881 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1882 if (!chanctx_conf
) {
1886 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1888 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1889 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1890 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1892 band
= chanctx_conf
->def
.chan
->band
;
1894 case NL80211_IFTYPE_WDS
:
1895 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1897 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1898 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1899 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1900 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1903 * This is the exception! WDS style interfaces are prohibited
1904 * when channel contexts are in used so this must be valid
1906 band
= local
->hw
.conf
.chandef
.chan
->band
;
1908 #ifdef CONFIG_MAC80211_MESH
1909 case NL80211_IFTYPE_MESH_POINT
:
1910 if (!is_multicast_ether_addr(skb
->data
)) {
1911 struct sta_info
*next_hop
;
1912 bool mpp_lookup
= true;
1914 mpath
= mesh_path_lookup(sdata
, skb
->data
);
1917 next_hop
= rcu_dereference(mpath
->next_hop
);
1919 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
1920 MESH_PATH_RESOLVING
)))
1925 mppath
= mpp_path_lookup(sdata
, skb
->data
);
1927 if (mppath
&& mpath
)
1928 mesh_path_del(mpath
->sdata
, mpath
->dst
);
1932 * Use address extension if it is a packet from
1933 * another interface or if we know the destination
1934 * is being proxied by a portal (i.e. portal address
1935 * differs from proxied address)
1937 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1938 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1939 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1940 skb
->data
, skb
->data
+ ETH_ALEN
);
1941 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
1944 /* DS -> MBSS (802.11-2012 13.11.3.3).
1945 * For unicast with unknown forwarding information,
1946 * destination might be in the MBSS or if that fails
1947 * forwarded to another mesh gate. In either case
1948 * resolution will be handled in ieee80211_xmit(), so
1949 * leave the original DA. This also works for mcast */
1950 const u8
*mesh_da
= skb
->data
;
1953 mesh_da
= mppath
->mpp
;
1955 mesh_da
= mpath
->dst
;
1957 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1958 mesh_da
, sdata
->vif
.addr
);
1959 if (is_multicast_ether_addr(mesh_da
))
1960 /* DA TA mSA AE:SA */
1961 meshhdrlen
= ieee80211_new_mesh_header(
1963 skb
->data
+ ETH_ALEN
, NULL
);
1965 /* RA TA mDA mSA AE:DA SA */
1966 meshhdrlen
= ieee80211_new_mesh_header(
1967 sdata
, &mesh_hdr
, skb
->data
,
1968 skb
->data
+ ETH_ALEN
);
1971 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1972 if (!chanctx_conf
) {
1976 band
= chanctx_conf
->def
.chan
->band
;
1979 case NL80211_IFTYPE_STATION
:
1980 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1981 sta
= sta_info_get(sdata
, skb
->data
);
1983 authorized
= test_sta_flag(sta
,
1984 WLAN_STA_AUTHORIZED
);
1985 wme_sta
= sta
->sta
.wme
;
1986 tdls_peer
= test_sta_flag(sta
,
1987 WLAN_STA_TDLS_PEER
);
1988 tdls_auth
= test_sta_flag(sta
,
1989 WLAN_STA_TDLS_PEER_AUTH
);
1994 ethertype
== ETH_P_TDLS
&&
1996 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
2000 * TDLS link during setup - throw out frames to peer. We allow
2001 * TDLS-setup frames to unauthorized peers for the special case
2002 * of a link teardown after a TDLS sta is removed due to being
2005 if (tdls_peer
&& !tdls_auth
&& !tdls_setup_frame
) {
2010 /* send direct packets to authorized TDLS peers */
2011 if (tdls_peer
&& tdls_auth
) {
2013 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2014 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2015 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2017 } else if (sdata
->u
.mgd
.use_4addr
&&
2018 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2019 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2020 IEEE80211_FCTL_TODS
);
2022 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2023 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2024 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2025 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2028 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2030 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2031 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2032 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2035 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2036 if (!chanctx_conf
) {
2040 band
= chanctx_conf
->def
.chan
->band
;
2042 case NL80211_IFTYPE_OCB
:
2044 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2045 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2046 eth_broadcast_addr(hdr
.addr3
);
2048 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2049 if (!chanctx_conf
) {
2053 band
= chanctx_conf
->def
.chan
->band
;
2055 case NL80211_IFTYPE_ADHOC
:
2057 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2058 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2059 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2061 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2062 if (!chanctx_conf
) {
2066 band
= chanctx_conf
->def
.chan
->band
;
2074 * There's no need to try to look up the destination
2075 * if it is a multicast address (which can only happen
2078 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2080 sta
= sta_info_get(sdata
, hdr
.addr1
);
2082 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2083 wme_sta
= sta
->sta
.wme
;
2087 /* For mesh, the use of the QoS header is mandatory */
2088 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2091 /* receiver and we are QoS enabled, use a QoS type frame */
2092 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
2093 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2098 * Drop unicast frames to unauthorised stations unless they are
2099 * EAPOL frames from the local station.
2101 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2102 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2103 !multicast
&& !authorized
&&
2104 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2105 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2106 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2107 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2108 sdata
->name
, hdr
.addr1
);
2111 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2117 if (unlikely(!multicast
&& skb
->sk
&&
2118 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2119 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2122 unsigned long flags
;
2125 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2126 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2127 1, 0x10000, GFP_ATOMIC
);
2128 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2132 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2140 * If the skb is shared we need to obtain our own copy.
2142 if (skb_shared(skb
)) {
2143 struct sk_buff
*tmp_skb
= skb
;
2145 /* can't happen -- skb is a clone if info_id != 0 */
2148 skb
= skb_clone(skb
, GFP_ATOMIC
);
2157 hdr
.frame_control
= fc
;
2158 hdr
.duration_id
= 0;
2161 skip_header_bytes
= ETH_HLEN
;
2162 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2163 encaps_data
= bridge_tunnel_header
;
2164 encaps_len
= sizeof(bridge_tunnel_header
);
2165 skip_header_bytes
-= 2;
2166 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2167 encaps_data
= rfc1042_header
;
2168 encaps_len
= sizeof(rfc1042_header
);
2169 skip_header_bytes
-= 2;
2175 nh_pos
= skb_network_header(skb
) - skb
->data
;
2176 h_pos
= skb_transport_header(skb
) - skb
->data
;
2178 skb_pull(skb
, skip_header_bytes
);
2179 nh_pos
-= skip_header_bytes
;
2180 h_pos
-= skip_header_bytes
;
2182 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2185 * So we need to modify the skb header and hence need a copy of
2186 * that. The head_need variable above doesn't, so far, include
2187 * the needed header space that we don't need right away. If we
2188 * can, then we don't reallocate right now but only after the
2189 * frame arrives at the master device (if it does...)
2191 * If we cannot, however, then we will reallocate to include all
2192 * the ever needed space. Also, if we need to reallocate it anyway,
2193 * make it big enough for everything we may ever need.
2196 if (head_need
> 0 || skb_cloned(skb
)) {
2197 head_need
+= sdata
->encrypt_headroom
;
2198 head_need
+= local
->tx_headroom
;
2199 head_need
= max_t(int, 0, head_need
);
2200 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2201 ieee80211_free_txskb(&local
->hw
, skb
);
2203 return ERR_PTR(-ENOMEM
);
2208 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2209 nh_pos
+= encaps_len
;
2210 h_pos
+= encaps_len
;
2213 #ifdef CONFIG_MAC80211_MESH
2214 if (meshhdrlen
> 0) {
2215 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2216 nh_pos
+= meshhdrlen
;
2217 h_pos
+= meshhdrlen
;
2221 if (ieee80211_is_data_qos(fc
)) {
2222 __le16
*qos_control
;
2224 qos_control
= (__le16
*) skb_push(skb
, 2);
2225 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2227 * Maybe we could actually set some fields here, for now just
2228 * initialise to zero to indicate no special operation.
2232 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2237 /* Update skb pointers to various headers since this modified frame
2238 * is going to go through Linux networking code that may potentially
2239 * need things like pointer to IP header. */
2240 skb_set_mac_header(skb
, 0);
2241 skb_set_network_header(skb
, nh_pos
);
2242 skb_set_transport_header(skb
, h_pos
);
2244 info
= IEEE80211_SKB_CB(skb
);
2245 memset(info
, 0, sizeof(*info
));
2247 info
->flags
= info_flags
;
2248 info
->ack_frame_id
= info_id
;
2254 return ERR_PTR(ret
);
2257 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2258 struct net_device
*dev
,
2261 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2262 struct ieee80211_local
*local
= sdata
->local
;
2264 if (unlikely(skb
->len
< ETH_HLEN
)) {
2271 /* Measure frame arrival for Tx latency statistics calculation */
2272 ieee80211_tx_latency_start_msrmnt(local
, skb
);
2274 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
);
2278 dev
->stats
.tx_packets
++;
2279 dev
->stats
.tx_bytes
+= skb
->len
;
2280 dev
->trans_start
= jiffies
;
2282 ieee80211_xmit(sdata
, skb
);
2288 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2289 * @skb: packet to be sent
2290 * @dev: incoming interface
2292 * On failure skb will be freed.
2294 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2295 struct net_device
*dev
)
2297 __ieee80211_subif_start_xmit(skb
, dev
, 0);
2298 return NETDEV_TX_OK
;
2302 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
2303 struct sk_buff
*skb
, u32 info_flags
)
2305 struct ieee80211_hdr
*hdr
;
2306 struct ieee80211_tx_data tx
= {
2307 .local
= sdata
->local
,
2313 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
);
2317 hdr
= (void *)skb
->data
;
2318 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
2321 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
2324 return ERR_PTR(-EINVAL
);
2333 * ieee80211_clear_tx_pending may not be called in a context where
2334 * it is possible that it packets could come in again.
2336 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2338 struct sk_buff
*skb
;
2341 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2342 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2343 ieee80211_free_txskb(&local
->hw
, skb
);
2348 * Returns false if the frame couldn't be transmitted but was queued instead,
2349 * which in this case means re-queued -- take as an indication to stop sending
2350 * more pending frames.
2352 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2353 struct sk_buff
*skb
)
2355 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2356 struct ieee80211_sub_if_data
*sdata
;
2357 struct sta_info
*sta
;
2358 struct ieee80211_hdr
*hdr
;
2360 struct ieee80211_chanctx_conf
*chanctx_conf
;
2362 sdata
= vif_to_sdata(info
->control
.vif
);
2364 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2365 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2366 if (unlikely(!chanctx_conf
)) {
2370 info
->band
= chanctx_conf
->def
.chan
->band
;
2371 result
= ieee80211_tx(sdata
, skb
, true);
2373 struct sk_buff_head skbs
;
2375 __skb_queue_head_init(&skbs
);
2376 __skb_queue_tail(&skbs
, skb
);
2378 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2379 sta
= sta_info_get(sdata
, hdr
->addr1
);
2381 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2388 * Transmit all pending packets. Called from tasklet.
2390 void ieee80211_tx_pending(unsigned long data
)
2392 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2393 unsigned long flags
;
2399 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2400 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2402 * If queue is stopped by something other than due to pending
2403 * frames, or we have no pending frames, proceed to next queue.
2405 if (local
->queue_stop_reasons
[i
] ||
2406 skb_queue_empty(&local
->pending
[i
]))
2409 while (!skb_queue_empty(&local
->pending
[i
])) {
2410 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2411 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2413 if (WARN_ON(!info
->control
.vif
)) {
2414 ieee80211_free_txskb(&local
->hw
, skb
);
2418 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2421 txok
= ieee80211_tx_pending_skb(local
, skb
);
2422 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2428 if (skb_queue_empty(&local
->pending
[i
]))
2429 ieee80211_propagate_queue_wake(local
, i
);
2431 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2436 /* functions for drivers to get certain frames */
2438 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2439 struct ps_data
*ps
, struct sk_buff
*skb
,
2444 int i
, have_bits
= 0, n1
, n2
;
2446 /* Generate bitmap for TIM only if there are any STAs in power save
2448 if (atomic_read(&ps
->num_sta_ps
) > 0)
2449 /* in the hope that this is faster than
2450 * checking byte-for-byte */
2451 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
2452 IEEE80211_MAX_AID
+1);
2454 if (ps
->dtim_count
== 0)
2455 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2460 tim
= pos
= (u8
*) skb_put(skb
, 6);
2461 *pos
++ = WLAN_EID_TIM
;
2463 *pos
++ = ps
->dtim_count
;
2464 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2466 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
2469 ps
->dtim_bc_mc
= aid0
== 1;
2472 /* Find largest even number N1 so that bits numbered 1 through
2473 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2474 * (N2 + 1) x 8 through 2007 are 0. */
2476 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2483 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2490 /* Bitmap control */
2492 /* Part Virt Bitmap */
2493 skb_put(skb
, n2
- n1
);
2494 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
2496 tim
[1] = n2
- n1
+ 4;
2498 *pos
++ = aid0
; /* Bitmap control */
2499 *pos
++ = 0; /* Part Virt Bitmap */
2503 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2504 struct ps_data
*ps
, struct sk_buff
*skb
,
2507 struct ieee80211_local
*local
= sdata
->local
;
2510 * Not very nice, but we want to allow the driver to call
2511 * ieee80211_beacon_get() as a response to the set_tim()
2512 * callback. That, however, is already invoked under the
2513 * sta_lock to guarantee consistent and race-free update
2514 * of the tim bitmap in mac80211 and the driver.
2516 if (local
->tim_in_locked_section
) {
2517 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
2519 spin_lock_bh(&local
->tim_lock
);
2520 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
2521 spin_unlock_bh(&local
->tim_lock
);
2527 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
2528 struct beacon_data
*beacon
)
2530 struct probe_resp
*resp
;
2532 size_t beacon_data_len
;
2534 u8 count
= beacon
->csa_current_counter
;
2536 switch (sdata
->vif
.type
) {
2537 case NL80211_IFTYPE_AP
:
2538 beacon_data
= beacon
->tail
;
2539 beacon_data_len
= beacon
->tail_len
;
2541 case NL80211_IFTYPE_ADHOC
:
2542 beacon_data
= beacon
->head
;
2543 beacon_data_len
= beacon
->head_len
;
2545 case NL80211_IFTYPE_MESH_POINT
:
2546 beacon_data
= beacon
->head
;
2547 beacon_data_len
= beacon
->head_len
;
2554 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
2555 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
2557 if (beacon
->csa_counter_offsets
[i
]) {
2558 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
2564 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
2567 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
2568 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
2573 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
2575 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2576 struct beacon_data
*beacon
= NULL
;
2581 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2582 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
2583 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2584 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
2585 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
2586 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
2591 beacon
->csa_current_counter
--;
2593 /* the counter should never reach 0 */
2594 WARN_ON_ONCE(!beacon
->csa_current_counter
);
2595 count
= beacon
->csa_current_counter
;
2601 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
2603 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
2605 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2606 struct beacon_data
*beacon
= NULL
;
2608 size_t beacon_data_len
;
2611 if (!ieee80211_sdata_running(sdata
))
2615 if (vif
->type
== NL80211_IFTYPE_AP
) {
2616 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2618 beacon
= rcu_dereference(ap
->beacon
);
2619 if (WARN_ON(!beacon
|| !beacon
->tail
))
2621 beacon_data
= beacon
->tail
;
2622 beacon_data_len
= beacon
->tail_len
;
2623 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
2624 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2626 beacon
= rcu_dereference(ifibss
->presp
);
2630 beacon_data
= beacon
->head
;
2631 beacon_data_len
= beacon
->head_len
;
2632 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
2633 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2635 beacon
= rcu_dereference(ifmsh
->beacon
);
2639 beacon_data
= beacon
->head
;
2640 beacon_data_len
= beacon
->head_len
;
2646 if (!beacon
->csa_counter_offsets
[0])
2649 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
2652 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
2659 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
2661 static struct sk_buff
*
2662 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
2663 struct ieee80211_vif
*vif
,
2664 struct ieee80211_mutable_offsets
*offs
,
2667 struct ieee80211_local
*local
= hw_to_local(hw
);
2668 struct beacon_data
*beacon
= NULL
;
2669 struct sk_buff
*skb
= NULL
;
2670 struct ieee80211_tx_info
*info
;
2671 struct ieee80211_sub_if_data
*sdata
= NULL
;
2672 enum ieee80211_band band
;
2673 struct ieee80211_tx_rate_control txrc
;
2674 struct ieee80211_chanctx_conf
*chanctx_conf
;
2675 int csa_off_base
= 0;
2679 sdata
= vif_to_sdata(vif
);
2680 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2682 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
2686 memset(offs
, 0, sizeof(*offs
));
2688 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2689 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
2691 beacon
= rcu_dereference(ap
->beacon
);
2693 if (beacon
->csa_counter_offsets
[0]) {
2695 ieee80211_csa_update_counter(vif
);
2697 ieee80211_set_csa(sdata
, beacon
);
2701 * headroom, head length,
2702 * tail length and maximum TIM length
2704 skb
= dev_alloc_skb(local
->tx_headroom
+
2706 beacon
->tail_len
+ 256 +
2707 local
->hw
.extra_beacon_tailroom
);
2711 skb_reserve(skb
, local
->tx_headroom
);
2712 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2715 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
2719 offs
->tim_offset
= beacon
->head_len
;
2720 offs
->tim_length
= skb
->len
- beacon
->head_len
;
2722 /* for AP the csa offsets are from tail */
2723 csa_off_base
= skb
->len
;
2727 memcpy(skb_put(skb
, beacon
->tail_len
),
2728 beacon
->tail
, beacon
->tail_len
);
2731 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2732 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2733 struct ieee80211_hdr
*hdr
;
2735 beacon
= rcu_dereference(ifibss
->presp
);
2739 if (beacon
->csa_counter_offsets
[0]) {
2741 ieee80211_csa_update_counter(vif
);
2743 ieee80211_set_csa(sdata
, beacon
);
2746 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
2747 local
->hw
.extra_beacon_tailroom
);
2750 skb_reserve(skb
, local
->tx_headroom
);
2751 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2754 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2755 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2756 IEEE80211_STYPE_BEACON
);
2757 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2758 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2760 beacon
= rcu_dereference(ifmsh
->beacon
);
2764 if (beacon
->csa_counter_offsets
[0]) {
2766 /* TODO: For mesh csa_counter is in TU, so
2767 * decrementing it by one isn't correct, but
2768 * for now we leave it consistent with overall
2769 * mac80211's behavior.
2771 ieee80211_csa_update_counter(vif
);
2773 ieee80211_set_csa(sdata
, beacon
);
2776 if (ifmsh
->sync_ops
)
2777 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
2779 skb
= dev_alloc_skb(local
->tx_headroom
+
2783 local
->hw
.extra_beacon_tailroom
);
2786 skb_reserve(skb
, local
->tx_headroom
);
2787 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2789 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
2792 offs
->tim_offset
= beacon
->head_len
;
2793 offs
->tim_length
= skb
->len
- beacon
->head_len
;
2796 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
2804 if (offs
&& beacon
) {
2807 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
2808 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
2813 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
2817 band
= chanctx_conf
->def
.chan
->band
;
2819 info
= IEEE80211_SKB_CB(skb
);
2821 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2822 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2825 memset(&txrc
, 0, sizeof(txrc
));
2827 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
2828 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2830 txrc
.reported_rate
.idx
= -1;
2831 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2832 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
2833 txrc
.max_rate_idx
= -1;
2835 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2837 rate_control_get_rate(sdata
, NULL
, &txrc
);
2839 info
->control
.vif
= vif
;
2841 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2842 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2843 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2851 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
2852 struct ieee80211_vif
*vif
,
2853 struct ieee80211_mutable_offsets
*offs
)
2855 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
2857 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
2859 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2860 struct ieee80211_vif
*vif
,
2861 u16
*tim_offset
, u16
*tim_length
)
2863 struct ieee80211_mutable_offsets offs
= {};
2864 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
2867 *tim_offset
= offs
.tim_offset
;
2870 *tim_length
= offs
.tim_length
;
2874 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2876 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2877 struct ieee80211_vif
*vif
)
2879 struct ieee80211_if_ap
*ap
= NULL
;
2880 struct sk_buff
*skb
= NULL
;
2881 struct probe_resp
*presp
= NULL
;
2882 struct ieee80211_hdr
*hdr
;
2883 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2885 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2891 presp
= rcu_dereference(ap
->probe_resp
);
2895 skb
= dev_alloc_skb(presp
->len
);
2899 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
2901 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2902 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2908 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2910 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2911 struct ieee80211_vif
*vif
)
2913 struct ieee80211_sub_if_data
*sdata
;
2914 struct ieee80211_if_managed
*ifmgd
;
2915 struct ieee80211_pspoll
*pspoll
;
2916 struct ieee80211_local
*local
;
2917 struct sk_buff
*skb
;
2919 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2922 sdata
= vif_to_sdata(vif
);
2923 ifmgd
= &sdata
->u
.mgd
;
2924 local
= sdata
->local
;
2926 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2930 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2932 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2933 memset(pspoll
, 0, sizeof(*pspoll
));
2934 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2935 IEEE80211_STYPE_PSPOLL
);
2936 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2938 /* aid in PS-Poll has its two MSBs each set to 1 */
2939 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2941 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2942 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2946 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2948 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2949 struct ieee80211_vif
*vif
)
2951 struct ieee80211_hdr_3addr
*nullfunc
;
2952 struct ieee80211_sub_if_data
*sdata
;
2953 struct ieee80211_if_managed
*ifmgd
;
2954 struct ieee80211_local
*local
;
2955 struct sk_buff
*skb
;
2957 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2960 sdata
= vif_to_sdata(vif
);
2961 ifmgd
= &sdata
->u
.mgd
;
2962 local
= sdata
->local
;
2964 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2968 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2970 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2972 memset(nullfunc
, 0, sizeof(*nullfunc
));
2973 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2974 IEEE80211_STYPE_NULLFUNC
|
2975 IEEE80211_FCTL_TODS
);
2976 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2977 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2978 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2982 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2984 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2986 const u8
*ssid
, size_t ssid_len
,
2989 struct ieee80211_local
*local
= hw_to_local(hw
);
2990 struct ieee80211_hdr_3addr
*hdr
;
2991 struct sk_buff
*skb
;
2995 ie_ssid_len
= 2 + ssid_len
;
2997 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2998 ie_ssid_len
+ tailroom
);
3002 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3004 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
3005 memset(hdr
, 0, sizeof(*hdr
));
3006 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3007 IEEE80211_STYPE_PROBE_REQ
);
3008 eth_broadcast_addr(hdr
->addr1
);
3009 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
3010 eth_broadcast_addr(hdr
->addr3
);
3012 pos
= skb_put(skb
, ie_ssid_len
);
3013 *pos
++ = WLAN_EID_SSID
;
3016 memcpy(pos
, ssid
, ssid_len
);
3021 EXPORT_SYMBOL(ieee80211_probereq_get
);
3023 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3024 const void *frame
, size_t frame_len
,
3025 const struct ieee80211_tx_info
*frame_txctl
,
3026 struct ieee80211_rts
*rts
)
3028 const struct ieee80211_hdr
*hdr
= frame
;
3030 rts
->frame_control
=
3031 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
3032 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
3034 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
3035 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
3037 EXPORT_SYMBOL(ieee80211_rts_get
);
3039 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3040 const void *frame
, size_t frame_len
,
3041 const struct ieee80211_tx_info
*frame_txctl
,
3042 struct ieee80211_cts
*cts
)
3044 const struct ieee80211_hdr
*hdr
= frame
;
3046 cts
->frame_control
=
3047 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
3048 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
3049 frame_len
, frame_txctl
);
3050 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
3052 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
3055 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
3056 struct ieee80211_vif
*vif
)
3058 struct ieee80211_local
*local
= hw_to_local(hw
);
3059 struct sk_buff
*skb
= NULL
;
3060 struct ieee80211_tx_data tx
;
3061 struct ieee80211_sub_if_data
*sdata
;
3063 struct ieee80211_tx_info
*info
;
3064 struct ieee80211_chanctx_conf
*chanctx_conf
;
3066 sdata
= vif_to_sdata(vif
);
3069 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3074 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3075 struct beacon_data
*beacon
=
3076 rcu_dereference(sdata
->u
.ap
.beacon
);
3078 if (!beacon
|| !beacon
->head
)
3081 ps
= &sdata
->u
.ap
.ps
;
3082 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3083 ps
= &sdata
->u
.mesh
.ps
;
3088 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
3089 goto out
; /* send buffered bc/mc only after DTIM beacon */
3092 skb
= skb_dequeue(&ps
->bc_buf
);
3095 local
->total_ps_buffered
--;
3097 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
3098 struct ieee80211_hdr
*hdr
=
3099 (struct ieee80211_hdr
*) skb
->data
;
3100 /* more buffered multicast/broadcast frames ==> set
3101 * MoreData flag in IEEE 802.11 header to inform PS
3103 hdr
->frame_control
|=
3104 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
3107 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3108 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
3109 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
3111 dev_kfree_skb_any(skb
);
3114 info
= IEEE80211_SKB_CB(skb
);
3116 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
3117 info
->band
= chanctx_conf
->def
.chan
->band
;
3119 if (invoke_tx_handlers(&tx
))
3126 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
3128 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3130 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3131 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3132 struct ieee80211_local
*local
= sdata
->local
;
3136 lockdep_assert_held(&local
->sta_mtx
);
3138 /* only some cases are supported right now */
3139 switch (sdata
->vif
.type
) {
3140 case NL80211_IFTYPE_STATION
:
3141 case NL80211_IFTYPE_AP
:
3142 case NL80211_IFTYPE_AP_VLAN
:
3149 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
3152 if (sta
->reserved_tid
== tid
) {
3157 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
3158 sdata_err(sdata
, "TID reservation already active\n");
3163 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
3164 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3168 /* Tear down BA sessions so we stop aggregating on this TID */
3169 if (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) {
3170 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3171 __ieee80211_stop_tx_ba_session(sta
, tid
,
3172 AGG_STOP_LOCAL_REQUEST
);
3175 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
3176 __ieee80211_flush_queues(local
, sdata
, queues
, false);
3178 sta
->reserved_tid
= tid
;
3180 ieee80211_wake_vif_queues(local
, sdata
,
3181 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3183 if (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)
3184 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3190 EXPORT_SYMBOL(ieee80211_reserve_tid
);
3192 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3194 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3195 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3197 lockdep_assert_held(&sdata
->local
->sta_mtx
);
3199 /* only some cases are supported right now */
3200 switch (sdata
->vif
.type
) {
3201 case NL80211_IFTYPE_STATION
:
3202 case NL80211_IFTYPE_AP
:
3203 case NL80211_IFTYPE_AP_VLAN
:
3210 if (tid
!= sta
->reserved_tid
) {
3211 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
3215 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
3217 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
3219 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
3220 struct sk_buff
*skb
, int tid
,
3221 enum ieee80211_band band
)
3223 int ac
= ieee802_1d_to_ac
[tid
& 7];
3225 skb_set_mac_header(skb
, 0);
3226 skb_set_network_header(skb
, 0);
3227 skb_set_transport_header(skb
, 0);
3229 skb_set_queue_mapping(skb
, ac
);
3230 skb
->priority
= tid
;
3232 skb
->dev
= sdata
->dev
;
3235 * The other path calling ieee80211_xmit is from the tasklet,
3236 * and while we can handle concurrent transmissions locking
3237 * requirements are that we do not come into tx with bhs on.
3240 IEEE80211_SKB_CB(skb
)->band
= band
;
3241 ieee80211_xmit(sdata
, skb
);