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/if_vlan.h>
20 #include <linux/etherdevice.h>
21 #include <linux/bitmap.h>
22 #include <linux/rcupdate.h>
23 #include <linux/export.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 <net/codel.h>
29 #include <net/codel_impl.h>
30 #include <asm/unaligned.h>
31 #include <net/fq_impl.h>
33 #include "ieee80211_i.h"
34 #include "driver-ops.h"
44 static inline void ieee80211_tx_stats(struct net_device
*dev
, u32 len
)
46 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
48 u64_stats_update_begin(&tstats
->syncp
);
50 tstats
->tx_bytes
+= len
;
51 u64_stats_update_end(&tstats
->syncp
);
54 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
55 struct sk_buff
*skb
, int group_addr
,
58 int rate
, mrate
, erp
, dur
, i
, shift
= 0;
59 struct ieee80211_rate
*txrate
;
60 struct ieee80211_local
*local
= tx
->local
;
61 struct ieee80211_supported_band
*sband
;
62 struct ieee80211_hdr
*hdr
;
63 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
64 struct ieee80211_chanctx_conf
*chanctx_conf
;
67 /* assume HW handles this */
68 if (tx
->rate
.flags
& (IEEE80211_TX_RC_MCS
| IEEE80211_TX_RC_VHT_MCS
))
72 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
74 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
75 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
80 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
83 sband
= local
->hw
.wiphy
->bands
[info
->band
];
84 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
86 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
89 * data and mgmt (except PS Poll):
91 * - during contention period:
92 * if addr1 is group address: 0
93 * if more fragments = 0 and addr1 is individual address: time to
94 * transmit one ACK plus SIFS
95 * if more fragments = 1 and addr1 is individual address: time to
96 * transmit next fragment plus 2 x ACK plus 3 x SIFS
99 * - control response frame (CTS or ACK) shall be transmitted using the
100 * same rate as the immediately previous frame in the frame exchange
101 * sequence, if this rate belongs to the PHY mandatory rates, or else
102 * at the highest possible rate belonging to the PHY rates in the
105 hdr
= (struct ieee80211_hdr
*)skb
->data
;
106 if (ieee80211_is_ctl(hdr
->frame_control
)) {
107 /* TODO: These control frames are not currently sent by
108 * mac80211, but should they be implemented, this function
109 * needs to be updated to support duration field calculation.
111 * RTS: time needed to transmit pending data/mgmt frame plus
112 * one CTS frame plus one ACK frame plus 3 x SIFS
113 * CTS: duration of immediately previous RTS minus time
114 * required to transmit CTS and its SIFS
115 * ACK: 0 if immediately previous directed data/mgmt had
116 * more=0, with more=1 duration in ACK frame is duration
117 * from previous frame minus time needed to transmit ACK
119 * PS Poll: BIT(15) | BIT(14) | aid
125 if (0 /* FIX: data/mgmt during CFP */)
126 return cpu_to_le16(32768);
128 if (group_addr
) /* Group address as the destination - no ACK */
131 /* Individual destination address:
132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
133 * CTS and ACK frames shall be transmitted using the highest rate in
134 * basic rate set that is less than or equal to the rate of the
135 * immediately previous frame and that is using the same modulation
136 * (CCK or OFDM). If no basic rate set matches with these requirements,
137 * the highest mandatory rate of the PHY that is less than or equal to
138 * the rate of the previous frame is used.
139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
142 /* use lowest available if everything fails */
143 mrate
= sband
->bitrates
[0].bitrate
;
144 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
145 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
147 if (r
->bitrate
> txrate
->bitrate
)
150 if ((rate_flags
& r
->flags
) != rate_flags
)
153 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
154 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
156 switch (sband
->band
) {
157 case NL80211_BAND_2GHZ
: {
159 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
160 flag
= IEEE80211_RATE_MANDATORY_G
;
162 flag
= IEEE80211_RATE_MANDATORY_B
;
167 case NL80211_BAND_5GHZ
:
168 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
171 case NL80211_BAND_60GHZ
:
172 /* TODO, for now fall through */
173 case NUM_NL80211_BANDS
:
179 /* No matching basic rate found; use highest suitable mandatory
181 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
185 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
186 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
189 /* Time needed to transmit ACK
190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
191 * to closest integer */
192 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
193 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
197 /* Frame is fragmented: duration increases with time needed to
198 * transmit next fragment plus ACK and 2 x SIFS. */
199 dur
*= 2; /* ACK + SIFS */
201 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
202 txrate
->bitrate
, erp
,
203 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
207 return cpu_to_le16(dur
);
211 static ieee80211_tx_result debug_noinline
212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
214 struct ieee80211_local
*local
= tx
->local
;
215 struct ieee80211_if_managed
*ifmgd
;
217 /* driver doesn't support power save */
218 if (!ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
))
221 /* hardware does dynamic power save */
222 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
))
225 /* dynamic power save disabled */
226 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
229 /* we are scanning, don't enable power save */
233 if (!local
->ps_sdata
)
236 /* No point if we're going to suspend */
237 if (local
->quiescing
)
240 /* dynamic ps is supported only in managed mode */
241 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
244 ifmgd
= &tx
->sdata
->u
.mgd
;
247 * Don't wakeup from power save if u-apsd is enabled, voip ac has
248 * u-apsd enabled and the frame is in voip class. This effectively
249 * means that even if all access categories have u-apsd enabled, in
250 * practise u-apsd is only used with the voip ac. This is a
251 * workaround for the case when received voip class packets do not
252 * have correct qos tag for some reason, due the network or the
255 * Note: ifmgd->uapsd_queues access is racy here. If the value is
256 * changed via debugfs, user needs to reassociate manually to have
257 * everything in sync.
259 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
260 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
261 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
264 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
265 ieee80211_stop_queues_by_reason(&local
->hw
,
266 IEEE80211_MAX_QUEUE_MAP
,
267 IEEE80211_QUEUE_STOP_REASON_PS
,
269 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
270 ieee80211_queue_work(&local
->hw
,
271 &local
->dynamic_ps_disable_work
);
274 /* Don't restart the timer if we're not disassociated */
275 if (!ifmgd
->associated
)
278 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
279 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
284 static ieee80211_tx_result debug_noinline
285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
288 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
289 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
292 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
295 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
296 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
297 !ieee80211_is_probe_req(hdr
->frame_control
) &&
298 !ieee80211_is_nullfunc(hdr
->frame_control
))
300 * When software scanning only nullfunc frames (to notify
301 * the sleep state to the AP) and probe requests (for the
302 * active scan) are allowed, all other frames should not be
303 * sent and we should not get here, but if we do
304 * nonetheless, drop them to avoid sending them
305 * off-channel. See the link below and
306 * ieee80211_start_scan() for more.
308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
312 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
)
315 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
318 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
322 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
324 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
325 if (unlikely(!assoc
&&
326 ieee80211_is_data(hdr
->frame_control
))) {
327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
328 sdata_info(tx
->sdata
,
329 "dropped data frame to not associated station %pM\n",
332 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
335 } else if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
336 ieee80211_vif_get_num_mcast_if(tx
->sdata
) == 0)) {
338 * No associated STAs - no need to send multicast
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
353 int total
= 0, purged
= 0;
355 struct ieee80211_sub_if_data
*sdata
;
356 struct sta_info
*sta
;
358 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
361 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
362 ps
= &sdata
->u
.ap
.ps
;
363 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
364 ps
= &sdata
->u
.mesh
.ps
;
368 skb
= skb_dequeue(&ps
->bc_buf
);
371 ieee80211_free_txskb(&local
->hw
, skb
);
373 total
+= skb_queue_len(&ps
->bc_buf
);
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
380 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
383 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
384 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
385 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
388 ieee80211_free_txskb(&local
->hw
, skb
);
394 local
->total_ps_buffered
= total
;
395 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
401 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
402 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
406 * broadcast/multicast frame
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
415 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
419 ps
= &tx
->sdata
->bss
->ps
;
420 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
421 ps
= &tx
->sdata
->u
.mesh
.ps
;
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr
->frame_control
))
431 if (ieee80211_is_probe_req(hdr
->frame_control
))
434 if (ieee80211_hw_check(&tx
->local
->hw
, QUEUE_CONTROL
))
435 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
437 /* no stations in PS mode */
438 if (!atomic_read(&ps
->num_sta_ps
))
441 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx
->local
->hw
, HOST_BROADCAST_PS_BUFFERING
))
447 /* buffered in mac80211 */
448 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
449 purge_old_ps_buffers(tx
->local
);
451 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx
->local
->hw
, skb_dequeue(&ps
->bc_buf
));
456 tx
->local
->total_ps_buffered
++;
458 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
463 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
466 if (!ieee80211_is_mgmt(fc
))
469 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
472 if (!ieee80211_is_robust_mgmt_frame(skb
))
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
481 struct sta_info
*sta
= tx
->sta
;
482 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
483 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
484 struct ieee80211_local
*local
= tx
->local
;
489 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
490 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
491 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) &&
492 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
493 int ac
= skb_get_queue_mapping(tx
->skb
);
495 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
496 !ieee80211_is_bufferable_mmpdu(hdr
->frame_control
)) {
497 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
501 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
503 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
504 purge_old_ps_buffers(tx
->local
);
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta
->ps_lock
);
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
513 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
514 !test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) &&
515 !test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) {
516 spin_unlock(&sta
->ps_lock
);
520 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
521 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 ieee80211_free_txskb(&local
->hw
, old
);
527 tx
->local
->total_ps_buffered
++;
529 info
->control
.jiffies
= jiffies
;
530 info
->control
.vif
= &tx
->sdata
->vif
;
531 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
532 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
533 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
534 spin_unlock(&sta
->ps_lock
);
536 if (!timer_pending(&local
->sta_cleanup
))
537 mod_timer(&local
->sta_cleanup
,
538 round_jiffies(jiffies
+
539 STA_INFO_CLEANUP_INTERVAL
));
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
545 sta_info_recalc_tim(sta
);
548 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
560 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
563 if (tx
->flags
& IEEE80211_TX_UNICAST
)
564 return ieee80211_tx_h_unicast_ps_buf(tx
);
566 return ieee80211_tx_h_multicast_ps_buf(tx
);
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
572 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
574 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
575 if (tx
->sdata
->control_port_no_encrypt
)
576 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
577 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
578 info
->flags
|= IEEE80211_TX_CTL_USE_MINRATE
;
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
587 struct ieee80211_key
*key
;
588 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
589 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
591 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
594 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
596 else if (ieee80211_is_group_privacy_action(tx
->skb
) &&
597 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
599 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
600 is_multicast_ether_addr(hdr
->addr1
) &&
601 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
602 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
604 else if (is_multicast_ether_addr(hdr
->addr1
) &&
605 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
607 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
608 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
614 bool skip_hw
= false;
616 /* TODO: add threshold stuff again */
618 switch (tx
->key
->conf
.cipher
) {
619 case WLAN_CIPHER_SUITE_WEP40
:
620 case WLAN_CIPHER_SUITE_WEP104
:
621 case WLAN_CIPHER_SUITE_TKIP
:
622 if (!ieee80211_is_data_present(hdr
->frame_control
))
625 case WLAN_CIPHER_SUITE_CCMP
:
626 case WLAN_CIPHER_SUITE_CCMP_256
:
627 case WLAN_CIPHER_SUITE_GCMP
:
628 case WLAN_CIPHER_SUITE_GCMP_256
:
629 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
630 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
632 !ieee80211_is_group_privacy_action(tx
->skb
))
635 skip_hw
= (tx
->key
->conf
.flags
&
636 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
637 ieee80211_is_mgmt(hdr
->frame_control
);
639 case WLAN_CIPHER_SUITE_AES_CMAC
:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
643 if (!ieee80211_is_mgmt(hdr
->frame_control
))
648 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
649 !ieee80211_is_deauth(hdr
->frame_control
)))
652 if (!skip_hw
&& tx
->key
&&
653 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
654 info
->control
.hw_key
= &tx
->key
->conf
;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
663 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
664 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
665 struct ieee80211_supported_band
*sband
;
667 struct ieee80211_tx_rate_control txrc
;
668 struct ieee80211_sta_rates
*ratetbl
= NULL
;
671 memset(&txrc
, 0, sizeof(txrc
));
673 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
675 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
676 tx
->local
->hw
.wiphy
->frag_threshold
);
678 /* set up the tx rate control struct we give the RC algo */
679 txrc
.hw
= &tx
->local
->hw
;
681 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
683 txrc
.reported_rate
.idx
= -1;
684 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
686 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
687 txrc
.rate_idx_mcs_mask
=
688 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
690 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
691 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
692 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
693 tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
);
695 /* set up RTS protection if desired */
696 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
700 info
->control
.use_rts
= txrc
.rts
;
701 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
704 * Use short preamble if the BSS can handle it, but not for
705 * management frames unless we know the receiver can handle
706 * that -- the management frame might be to a station that
707 * just wants a probe response.
709 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
710 (ieee80211_is_data(hdr
->frame_control
) ||
711 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
712 txrc
.short_preamble
= true;
714 info
->control
.short_preamble
= txrc
.short_preamble
;
716 /* don't ask rate control when rate already injected via radiotap */
717 if (info
->control
.flags
& IEEE80211_TX_CTRL_RATE_INJECT
)
721 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
724 * Lets not bother rate control if we're associated and cannot
725 * talk to the sta. This should not happen.
727 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
728 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
729 "%s: Dropped data frame as no usable bitrate found while "
730 "scanning and associated. Target station: "
731 "%pM on %d GHz band\n",
732 tx
->sdata
->name
, hdr
->addr1
,
737 * If we're associated with the sta at this point we know we can at
738 * least send the frame at the lowest bit rate.
740 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
742 if (tx
->sta
&& !info
->control
.skip_table
)
743 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
745 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
747 struct ieee80211_tx_rate rate
= {
748 .idx
= ratetbl
->rate
[0].idx
,
749 .flags
= ratetbl
->rate
[0].flags
,
750 .count
= ratetbl
->rate
[0].count
753 if (ratetbl
->rate
[0].idx
< 0)
761 tx
->rate
= info
->control
.rates
[0];
764 if (txrc
.reported_rate
.idx
< 0) {
765 txrc
.reported_rate
= tx
->rate
;
766 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
767 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
769 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
774 if (unlikely(!info
->control
.rates
[0].count
))
775 info
->control
.rates
[0].count
= 1;
777 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
778 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
779 info
->control
.rates
[0].count
= 1;
784 static __le16
ieee80211_tx_next_seq(struct sta_info
*sta
, int tid
)
786 u16
*seq
= &sta
->tid_seq
[tid
];
787 __le16 ret
= cpu_to_le16(*seq
);
789 /* Increase the sequence number. */
790 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
795 static ieee80211_tx_result debug_noinline
796 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
798 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
799 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
808 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
811 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
814 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
826 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
827 is_multicast_ether_addr(hdr
->addr1
)) {
828 /* driver should assign sequence number */
829 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
830 /* for pure STA mode without beacons, we can do it */
831 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
832 tx
->sdata
->sequence_number
+= 0x10;
834 tx
->sta
->tx_stats
.msdu
[IEEE80211_NUM_TIDS
]++;
839 * This should be true for injected/management frames only, for
840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 * above since they are not QoS-data frames.
846 /* include per-STA, per-TID sequence counter */
848 qc
= ieee80211_get_qos_ctl(hdr
);
849 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
850 tx
->sta
->tx_stats
.msdu
[tid
]++;
852 hdr
->seq_ctrl
= ieee80211_tx_next_seq(tx
->sta
, tid
);
857 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
858 struct sk_buff
*skb
, int hdrlen
,
861 struct ieee80211_local
*local
= tx
->local
;
862 struct ieee80211_tx_info
*info
;
864 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
865 int pos
= hdrlen
+ per_fragm
;
866 int rem
= skb
->len
- hdrlen
- per_fragm
;
868 if (WARN_ON(rem
< 0))
871 /* first fragment was already added to queue by caller */
874 int fraglen
= per_fragm
;
879 tmp
= dev_alloc_skb(local
->tx_headroom
+
881 tx
->sdata
->encrypt_headroom
+
882 IEEE80211_ENCRYPT_TAILROOM
);
886 __skb_queue_tail(&tx
->skbs
, tmp
);
889 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
891 /* copy control information */
892 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
894 info
= IEEE80211_SKB_CB(tmp
);
895 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
896 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
899 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
901 skb_copy_queue_mapping(tmp
, skb
);
902 tmp
->priority
= skb
->priority
;
905 /* copy header and data */
906 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
907 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
912 /* adjust first fragment's length */
913 skb_trim(skb
, hdrlen
+ per_fragm
);
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
920 struct sk_buff
*skb
= tx
->skb
;
921 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
922 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
923 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx
->skbs
, skb
);
931 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
934 if (ieee80211_hw_check(&tx
->local
->hw
, SUPPORTS_TX_FRAG
))
938 * Warn when submitting a fragmented A-MPDU frame and drop it.
939 * This scenario is handled in ieee80211_tx_prepare but extra
940 * caution taken here as fragmented ampdu may cause Tx stop.
942 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
945 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
947 /* internal error, why isn't DONTFRAG set? */
948 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
952 * Now fragment the frame. This will allocate all the fragments and
953 * chain them (using skb as the first fragment) to skb->next.
954 * During transmission, we will remove the successfully transmitted
955 * fragments from this list. When the low-level driver rejects one
956 * of the fragments then we will simply pretend to accept the skb
957 * but store it away as pending.
959 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
962 /* update duration/seq/flags of fragments */
965 skb_queue_walk(&tx
->skbs
, skb
) {
966 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
968 hdr
= (void *)skb
->data
;
969 info
= IEEE80211_SKB_CB(skb
);
971 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
972 hdr
->frame_control
|= morefrags
;
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
977 info
->control
.rates
[1].idx
= -1;
978 info
->control
.rates
[2].idx
= -1;
979 info
->control
.rates
[3].idx
= -1;
980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
981 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
983 hdr
->frame_control
&= ~morefrags
;
985 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
1001 skb_queue_walk(&tx
->skbs
, skb
) {
1002 ac
= skb_get_queue_mapping(skb
);
1003 tx
->sta
->tx_stats
.bytes
[ac
] += skb
->len
;
1006 tx
->sta
->tx_stats
.packets
[ac
]++;
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1017 switch (tx
->key
->conf
.cipher
) {
1018 case WLAN_CIPHER_SUITE_WEP40
:
1019 case WLAN_CIPHER_SUITE_WEP104
:
1020 return ieee80211_crypto_wep_encrypt(tx
);
1021 case WLAN_CIPHER_SUITE_TKIP
:
1022 return ieee80211_crypto_tkip_encrypt(tx
);
1023 case WLAN_CIPHER_SUITE_CCMP
:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx
, IEEE80211_CCMP_MIC_LEN
);
1026 case WLAN_CIPHER_SUITE_CCMP_256
:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1029 case WLAN_CIPHER_SUITE_AES_CMAC
:
1030 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1035 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1036 case WLAN_CIPHER_SUITE_GCMP
:
1037 case WLAN_CIPHER_SUITE_GCMP_256
:
1038 return ieee80211_crypto_gcmp_encrypt(tx
);
1040 return ieee80211_crypto_hw_encrypt(tx
);
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1049 struct sk_buff
*skb
;
1050 struct ieee80211_hdr
*hdr
;
1054 skb_queue_walk(&tx
->skbs
, skb
) {
1055 hdr
= (void *) skb
->data
;
1056 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1057 break; /* must not overwrite AID */
1058 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1059 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1060 next_len
= next
->len
;
1063 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1066 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1072 /* actual transmit path */
1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1075 struct sk_buff
*skb
,
1076 struct ieee80211_tx_info
*info
,
1077 struct tid_ampdu_tx
*tid_tx
,
1080 bool queued
= false;
1081 bool reset_agg_timer
= false;
1082 struct sk_buff
*purge_skb
= NULL
;
1084 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1085 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1086 reset_agg_timer
= true;
1087 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1092 } else if (!tx
->sta
->sta
.txq
[tid
]) {
1093 spin_lock(&tx
->sta
->lock
);
1095 * Need to re-check now, because we may get here
1097 * 1) in the window during which the setup is actually
1098 * already done, but not marked yet because not all
1099 * packets are spliced over to the driver pending
1100 * queue yet -- if this happened we acquire the lock
1101 * either before or after the splice happens, but
1102 * need to recheck which of these cases happened.
1104 * 2) during session teardown, if the OPERATIONAL bit
1105 * was cleared due to the teardown but the pointer
1106 * hasn't been assigned NULL yet (or we loaded it
1107 * before it was assigned) -- in this case it may
1108 * now be NULL which means we should just let the
1109 * packet pass through because splicing the frames
1110 * back is already done.
1112 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1115 /* do nothing, let packet pass through */
1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1117 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1118 reset_agg_timer
= true;
1121 if (info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
) {
1122 clear_sta_flag(tx
->sta
, WLAN_STA_SP
);
1123 ps_dbg(tx
->sta
->sdata
,
1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 tx
->sta
->sta
.addr
, tx
->sta
->sta
.aid
);
1127 info
->control
.vif
= &tx
->sdata
->vif
;
1128 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1129 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
1130 __skb_queue_tail(&tid_tx
->pending
, skb
);
1131 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1132 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1134 spin_unlock(&tx
->sta
->lock
);
1137 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1140 /* reset session timer */
1141 if (reset_agg_timer
&& tid_tx
->timeout
)
1142 tid_tx
->last_tx
= jiffies
;
1149 * pass %NULL for the station if unknown, a valid pointer if known
1150 * or an ERR_PTR() if the station is known not to exist
1152 static ieee80211_tx_result
1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1154 struct ieee80211_tx_data
*tx
,
1155 struct sta_info
*sta
, struct sk_buff
*skb
)
1157 struct ieee80211_local
*local
= sdata
->local
;
1158 struct ieee80211_hdr
*hdr
;
1159 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1163 memset(tx
, 0, sizeof(*tx
));
1167 __skb_queue_head_init(&tx
->skbs
);
1170 * If this flag is set to true anywhere, and we get here,
1171 * we are doing the needed processing, so remove the flag
1174 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1176 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1182 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1183 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1184 if (!tx
->sta
&& sdata
->wdev
.use_4addr
)
1186 } else if (info
->flags
& (IEEE80211_TX_INTFL_NL80211_FRAME_TX
|
1187 IEEE80211_TX_CTL_INJECTED
) ||
1188 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1189 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1191 if (!tx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
))
1192 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1195 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1196 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1197 ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
1198 !ieee80211_hw_check(&local
->hw
, TX_AMPDU_SETUP_IN_HW
)) {
1199 struct tid_ampdu_tx
*tid_tx
;
1201 qc
= ieee80211_get_qos_ctl(hdr
);
1202 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1204 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1208 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1211 if (unlikely(queued
))
1216 if (is_multicast_ether_addr(hdr
->addr1
)) {
1217 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1218 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1220 tx
->flags
|= IEEE80211_TX_UNICAST
;
1222 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1223 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1224 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1225 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1226 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1230 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1231 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
)) {
1232 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1233 ieee80211_check_fast_xmit(tx
->sta
);
1236 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1241 static struct txq_info
*ieee80211_get_txq(struct ieee80211_local
*local
,
1242 struct ieee80211_vif
*vif
,
1243 struct sta_info
*sta
,
1244 struct sk_buff
*skb
)
1246 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1247 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1248 struct ieee80211_txq
*txq
= NULL
;
1250 if ((info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
) ||
1251 (info
->control
.flags
& IEEE80211_TX_CTRL_PS_RESPONSE
))
1254 if (!ieee80211_is_data(hdr
->frame_control
))
1258 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TID_MASK
;
1263 txq
= sta
->sta
.txq
[tid
];
1271 return to_txq_info(txq
);
1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff
*skb
)
1276 IEEE80211_SKB_CB(skb
)->control
.enqueue_time
= codel_get_time();
1279 static void ieee80211_set_skb_vif(struct sk_buff
*skb
, struct txq_info
*txqi
)
1281 IEEE80211_SKB_CB(skb
)->control
.vif
= txqi
->txq
.vif
;
1284 static u32
codel_skb_len_func(const struct sk_buff
*skb
)
1289 static codel_time_t
codel_skb_time_func(const struct sk_buff
*skb
)
1291 const struct ieee80211_tx_info
*info
;
1293 info
= (const struct ieee80211_tx_info
*)skb
->cb
;
1294 return info
->control
.enqueue_time
;
1297 static struct sk_buff
*codel_dequeue_func(struct codel_vars
*cvars
,
1300 struct ieee80211_local
*local
;
1301 struct txq_info
*txqi
;
1303 struct fq_flow
*flow
;
1306 local
= vif_to_sdata(txqi
->txq
.vif
)->local
;
1309 if (cvars
== &txqi
->def_cvars
)
1310 flow
= &txqi
->def_flow
;
1312 flow
= &fq
->flows
[cvars
- local
->cvars
];
1314 return fq_flow_dequeue(fq
, flow
);
1317 static void codel_drop_func(struct sk_buff
*skb
,
1320 struct ieee80211_local
*local
;
1321 struct ieee80211_hw
*hw
;
1322 struct txq_info
*txqi
;
1325 local
= vif_to_sdata(txqi
->txq
.vif
)->local
;
1328 ieee80211_free_txskb(hw
, skb
);
1331 static struct sk_buff
*fq_tin_dequeue_func(struct fq
*fq
,
1333 struct fq_flow
*flow
)
1335 struct ieee80211_local
*local
;
1336 struct txq_info
*txqi
;
1337 struct codel_vars
*cvars
;
1338 struct codel_params
*cparams
;
1339 struct codel_stats
*cstats
;
1341 local
= container_of(fq
, struct ieee80211_local
, fq
);
1342 txqi
= container_of(tin
, struct txq_info
, tin
);
1343 cparams
= &local
->cparams
;
1344 cstats
= &txqi
->cstats
;
1346 if (flow
== &txqi
->def_flow
)
1347 cvars
= &txqi
->def_cvars
;
1349 cvars
= &local
->cvars
[flow
- fq
->flows
];
1351 return codel_dequeue(txqi
,
1357 codel_skb_time_func
,
1359 codel_dequeue_func
);
1362 static void fq_skb_free_func(struct fq
*fq
,
1364 struct fq_flow
*flow
,
1365 struct sk_buff
*skb
)
1367 struct ieee80211_local
*local
;
1369 local
= container_of(fq
, struct ieee80211_local
, fq
);
1370 ieee80211_free_txskb(&local
->hw
, skb
);
1373 static struct fq_flow
*fq_flow_get_default_func(struct fq
*fq
,
1376 struct sk_buff
*skb
)
1378 struct txq_info
*txqi
;
1380 txqi
= container_of(tin
, struct txq_info
, tin
);
1381 return &txqi
->def_flow
;
1384 static void ieee80211_txq_enqueue(struct ieee80211_local
*local
,
1385 struct txq_info
*txqi
,
1386 struct sk_buff
*skb
)
1388 struct fq
*fq
= &local
->fq
;
1389 struct fq_tin
*tin
= &txqi
->tin
;
1391 ieee80211_set_skb_enqueue_time(skb
);
1392 fq_tin_enqueue(fq
, tin
, skb
,
1394 fq_flow_get_default_func
);
1397 void ieee80211_txq_init(struct ieee80211_sub_if_data
*sdata
,
1398 struct sta_info
*sta
,
1399 struct txq_info
*txqi
, int tid
)
1401 fq_tin_init(&txqi
->tin
);
1402 fq_flow_init(&txqi
->def_flow
);
1403 codel_vars_init(&txqi
->def_cvars
);
1404 codel_stats_init(&txqi
->cstats
);
1405 __skb_queue_head_init(&txqi
->frags
);
1407 txqi
->txq
.vif
= &sdata
->vif
;
1410 txqi
->txq
.sta
= &sta
->sta
;
1411 sta
->sta
.txq
[tid
] = &txqi
->txq
;
1412 txqi
->txq
.tid
= tid
;
1413 txqi
->txq
.ac
= ieee80211_ac_from_tid(tid
);
1415 sdata
->vif
.txq
= &txqi
->txq
;
1417 txqi
->txq
.ac
= IEEE80211_AC_BE
;
1421 void ieee80211_txq_purge(struct ieee80211_local
*local
,
1422 struct txq_info
*txqi
)
1424 struct fq
*fq
= &local
->fq
;
1425 struct fq_tin
*tin
= &txqi
->tin
;
1427 fq_tin_reset(fq
, tin
, fq_skb_free_func
);
1428 ieee80211_purge_tx_queue(&local
->hw
, &txqi
->frags
);
1431 int ieee80211_txq_setup_flows(struct ieee80211_local
*local
)
1433 struct fq
*fq
= &local
->fq
;
1436 bool supp_vht
= false;
1437 enum nl80211_band band
;
1439 if (!local
->ops
->wake_tx_queue
)
1442 ret
= fq_init(fq
, 4096);
1447 * If the hardware doesn't support VHT, it is safe to limit the maximum
1448 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1450 for (band
= 0; band
< NUM_NL80211_BANDS
; band
++) {
1451 struct ieee80211_supported_band
*sband
;
1453 sband
= local
->hw
.wiphy
->bands
[band
];
1457 supp_vht
= supp_vht
|| sband
->vht_cap
.vht_supported
;
1461 fq
->memory_limit
= 4 << 20; /* 4 Mbytes */
1463 codel_params_init(&local
->cparams
);
1464 local
->cparams
.interval
= MS2TIME(100);
1465 local
->cparams
.target
= MS2TIME(20);
1466 local
->cparams
.ecn
= true;
1468 local
->cvars
= kcalloc(fq
->flows_cnt
, sizeof(local
->cvars
[0]),
1470 if (!local
->cvars
) {
1471 spin_lock_bh(&fq
->lock
);
1472 fq_reset(fq
, fq_skb_free_func
);
1473 spin_unlock_bh(&fq
->lock
);
1477 for (i
= 0; i
< fq
->flows_cnt
; i
++)
1478 codel_vars_init(&local
->cvars
[i
]);
1483 void ieee80211_txq_teardown_flows(struct ieee80211_local
*local
)
1485 struct fq
*fq
= &local
->fq
;
1487 if (!local
->ops
->wake_tx_queue
)
1490 kfree(local
->cvars
);
1491 local
->cvars
= NULL
;
1493 spin_lock_bh(&fq
->lock
);
1494 fq_reset(fq
, fq_skb_free_func
);
1495 spin_unlock_bh(&fq
->lock
);
1498 static bool ieee80211_queue_skb(struct ieee80211_local
*local
,
1499 struct ieee80211_sub_if_data
*sdata
,
1500 struct sta_info
*sta
,
1501 struct sk_buff
*skb
)
1503 struct fq
*fq
= &local
->fq
;
1504 struct ieee80211_vif
*vif
;
1505 struct txq_info
*txqi
;
1507 if (!local
->ops
->wake_tx_queue
||
1508 sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)
1511 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1512 sdata
= container_of(sdata
->bss
,
1513 struct ieee80211_sub_if_data
, u
.ap
);
1516 txqi
= ieee80211_get_txq(local
, vif
, sta
, skb
);
1521 spin_lock_bh(&fq
->lock
);
1522 ieee80211_txq_enqueue(local
, txqi
, skb
);
1523 spin_unlock_bh(&fq
->lock
);
1525 drv_wake_tx_queue(local
, txqi
);
1530 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1531 struct ieee80211_vif
*vif
,
1532 struct ieee80211_sta
*sta
,
1533 struct sk_buff_head
*skbs
,
1536 struct ieee80211_tx_control control
= {};
1537 struct sk_buff
*skb
, *tmp
;
1538 unsigned long flags
;
1540 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1541 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1542 int q
= info
->hw_queue
;
1544 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1545 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1546 __skb_unlink(skb
, skbs
);
1547 ieee80211_free_txskb(&local
->hw
, skb
);
1552 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1553 if (local
->queue_stop_reasons
[q
] ||
1554 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1555 if (unlikely(info
->flags
&
1556 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1557 if (local
->queue_stop_reasons
[q
] &
1558 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1560 * Drop off-channel frames if queues
1561 * are stopped for any reason other
1562 * than off-channel operation. Never
1565 spin_unlock_irqrestore(
1566 &local
->queue_stop_reason_lock
,
1568 ieee80211_purge_tx_queue(&local
->hw
,
1575 * Since queue is stopped, queue up frames for
1576 * later transmission from the tx-pending
1577 * tasklet when the queue is woken again.
1580 skb_queue_splice_init(skbs
,
1581 &local
->pending
[q
]);
1583 skb_queue_splice_tail_init(skbs
,
1584 &local
->pending
[q
]);
1586 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1591 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1593 info
->control
.vif
= vif
;
1596 __skb_unlink(skb
, skbs
);
1597 drv_tx(local
, &control
, skb
);
1604 * Returns false if the frame couldn't be transmitted but was queued instead.
1606 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1607 struct sk_buff_head
*skbs
, int led_len
,
1608 struct sta_info
*sta
, bool txpending
)
1610 struct ieee80211_tx_info
*info
;
1611 struct ieee80211_sub_if_data
*sdata
;
1612 struct ieee80211_vif
*vif
;
1613 struct ieee80211_sta
*pubsta
;
1614 struct sk_buff
*skb
;
1618 if (WARN_ON(skb_queue_empty(skbs
)))
1621 skb
= skb_peek(skbs
);
1622 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1623 info
= IEEE80211_SKB_CB(skb
);
1624 sdata
= vif_to_sdata(info
->control
.vif
);
1625 if (sta
&& !sta
->uploaded
)
1633 switch (sdata
->vif
.type
) {
1634 case NL80211_IFTYPE_MONITOR
:
1635 if (sdata
->u
.mntr
.flags
& MONITOR_FLAG_ACTIVE
) {
1639 sdata
= rcu_dereference(local
->monitor_sdata
);
1643 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1644 } else if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
)) {
1645 ieee80211_purge_tx_queue(&local
->hw
, skbs
);
1650 case NL80211_IFTYPE_AP_VLAN
:
1651 sdata
= container_of(sdata
->bss
,
1652 struct ieee80211_sub_if_data
, u
.ap
);
1659 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1662 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1664 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1670 * Invoke TX handlers, return 0 on success and non-zero if the
1671 * frame was dropped or queued.
1673 * The handlers are split into an early and late part. The latter is everything
1674 * that can be sensitive to reordering, and will be deferred to after packets
1675 * are dequeued from the intermediate queues (when they are enabled).
1677 static int invoke_tx_handlers_early(struct ieee80211_tx_data
*tx
)
1679 ieee80211_tx_result res
= TX_DROP
;
1681 #define CALL_TXH(txh) \
1684 if (res != TX_CONTINUE) \
1688 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1689 CALL_TXH(ieee80211_tx_h_check_assoc
);
1690 CALL_TXH(ieee80211_tx_h_ps_buf
);
1691 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1692 CALL_TXH(ieee80211_tx_h_select_key
);
1693 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1694 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1697 if (unlikely(res
== TX_DROP
)) {
1698 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1700 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1702 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1704 } else if (unlikely(res
== TX_QUEUED
)) {
1705 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1713 * Late handlers can be called while the sta lock is held. Handlers that can
1714 * cause packets to be generated will cause deadlock!
1716 static int invoke_tx_handlers_late(struct ieee80211_tx_data
*tx
)
1718 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1719 ieee80211_tx_result res
= TX_CONTINUE
;
1721 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1722 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1727 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1728 CALL_TXH(ieee80211_tx_h_sequence
);
1729 CALL_TXH(ieee80211_tx_h_fragment
);
1730 /* handlers after fragment must be aware of tx info fragmentation! */
1731 CALL_TXH(ieee80211_tx_h_stats
);
1732 CALL_TXH(ieee80211_tx_h_encrypt
);
1733 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1734 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1738 if (unlikely(res
== TX_DROP
)) {
1739 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1741 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1743 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1745 } else if (unlikely(res
== TX_QUEUED
)) {
1746 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1753 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1755 int r
= invoke_tx_handlers_early(tx
);
1759 return invoke_tx_handlers_late(tx
);
1762 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1763 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1764 int band
, struct ieee80211_sta
**sta
)
1766 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1767 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1768 struct ieee80211_tx_data tx
;
1769 struct sk_buff
*skb2
;
1771 if (ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
) == TX_DROP
)
1775 info
->control
.vif
= vif
;
1776 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1778 if (invoke_tx_handlers(&tx
))
1783 *sta
= &tx
.sta
->sta
;
1788 /* this function isn't suitable for fragmented data frames */
1789 skb2
= __skb_dequeue(&tx
.skbs
);
1790 if (WARN_ON(skb2
!= skb
|| !skb_queue_empty(&tx
.skbs
))) {
1791 ieee80211_free_txskb(hw
, skb2
);
1792 ieee80211_purge_tx_queue(hw
, &tx
.skbs
);
1798 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1801 * Returns false if the frame couldn't be transmitted but was queued instead.
1803 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1804 struct sta_info
*sta
, struct sk_buff
*skb
,
1807 struct ieee80211_local
*local
= sdata
->local
;
1808 struct ieee80211_tx_data tx
;
1809 ieee80211_tx_result res_prepare
;
1810 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1814 if (unlikely(skb
->len
< 10)) {
1819 /* initialises tx */
1821 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, sta
, skb
);
1823 if (unlikely(res_prepare
== TX_DROP
)) {
1824 ieee80211_free_txskb(&local
->hw
, skb
);
1826 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1830 /* set up hw_queue value early */
1831 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1832 !ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
1834 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1836 if (invoke_tx_handlers_early(&tx
))
1839 if (ieee80211_queue_skb(local
, sdata
, tx
.sta
, tx
.skb
))
1842 if (!invoke_tx_handlers_late(&tx
))
1843 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1849 /* device xmit handlers */
1851 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1852 struct sk_buff
*skb
,
1853 int head_need
, bool may_encrypt
)
1855 struct ieee80211_local
*local
= sdata
->local
;
1858 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1859 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1860 tail_need
-= skb_tailroom(skb
);
1861 tail_need
= max_t(int, tail_need
, 0);
1864 if (skb_cloned(skb
) &&
1865 (!ieee80211_hw_check(&local
->hw
, SUPPORTS_CLONED_SKBS
) ||
1866 !skb_clone_writable(skb
, ETH_HLEN
) ||
1867 (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
)))
1868 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1869 else if (head_need
|| tail_need
)
1870 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1874 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1875 wiphy_debug(local
->hw
.wiphy
,
1876 "failed to reallocate TX buffer\n");
1883 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1884 struct sta_info
*sta
, struct sk_buff
*skb
)
1886 struct ieee80211_local
*local
= sdata
->local
;
1887 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1888 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1892 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1894 headroom
= local
->tx_headroom
;
1896 headroom
+= sdata
->encrypt_headroom
;
1897 headroom
-= skb_headroom(skb
);
1898 headroom
= max_t(int, 0, headroom
);
1900 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1901 ieee80211_free_txskb(&local
->hw
, skb
);
1905 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1906 info
->control
.vif
= &sdata
->vif
;
1908 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1909 if (ieee80211_is_data(hdr
->frame_control
) &&
1910 is_unicast_ether_addr(hdr
->addr1
)) {
1911 if (mesh_nexthop_resolve(sdata
, skb
))
1912 return; /* skb queued: don't free */
1914 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1918 ieee80211_set_qos_hdr(sdata
, skb
);
1919 ieee80211_tx(sdata
, sta
, skb
, false);
1922 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local
*local
,
1923 struct sk_buff
*skb
)
1925 struct ieee80211_radiotap_iterator iterator
;
1926 struct ieee80211_radiotap_header
*rthdr
=
1927 (struct ieee80211_radiotap_header
*) skb
->data
;
1928 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1929 struct ieee80211_supported_band
*sband
=
1930 local
->hw
.wiphy
->bands
[info
->band
];
1931 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1935 bool rate_found
= false;
1936 u8 rate_retries
= 0;
1938 u8 mcs_known
, mcs_flags
, mcs_bw
;
1940 u8 vht_mcs
= 0, vht_nss
= 0;
1943 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1944 IEEE80211_TX_CTL_DONTFRAG
;
1947 * for every radiotap entry that is present
1948 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1949 * entries present, or -EINVAL on error)
1953 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1958 /* see if this argument is something we can use */
1959 switch (iterator
.this_arg_index
) {
1961 * You must take care when dereferencing iterator.this_arg
1962 * for multibyte types... the pointer is not aligned. Use
1963 * get_unaligned((type *)iterator.this_arg) to dereference
1964 * iterator.this_arg for type "type" safely on all arches.
1966 case IEEE80211_RADIOTAP_FLAGS
:
1967 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1969 * this indicates that the skb we have been
1970 * handed has the 32-bit FCS CRC at the end...
1971 * we should react to that by snipping it off
1972 * because it will be recomputed and added
1975 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1978 skb_trim(skb
, skb
->len
- FCS_LEN
);
1980 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1981 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1982 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1983 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1986 case IEEE80211_RADIOTAP_TX_FLAGS
:
1987 txflags
= get_unaligned_le16(iterator
.this_arg
);
1988 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1989 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1992 case IEEE80211_RADIOTAP_RATE
:
1993 rate
= *iterator
.this_arg
;
1998 case IEEE80211_RADIOTAP_DATA_RETRIES
:
1999 rate_retries
= *iterator
.this_arg
;
2002 case IEEE80211_RADIOTAP_MCS
:
2003 mcs_known
= iterator
.this_arg
[0];
2004 mcs_flags
= iterator
.this_arg
[1];
2005 if (!(mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_MCS
))
2009 rate
= iterator
.this_arg
[2];
2010 rate_flags
= IEEE80211_TX_RC_MCS
;
2012 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_GI
&&
2013 mcs_flags
& IEEE80211_RADIOTAP_MCS_SGI
)
2014 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
2016 mcs_bw
= mcs_flags
& IEEE80211_RADIOTAP_MCS_BW_MASK
;
2017 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_BW
&&
2018 mcs_bw
== IEEE80211_RADIOTAP_MCS_BW_40
)
2019 rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
2022 case IEEE80211_RADIOTAP_VHT
:
2023 vht_known
= get_unaligned_le16(iterator
.this_arg
);
2026 rate_flags
= IEEE80211_TX_RC_VHT_MCS
;
2027 if ((vht_known
& IEEE80211_RADIOTAP_VHT_KNOWN_GI
) &&
2028 (iterator
.this_arg
[2] &
2029 IEEE80211_RADIOTAP_VHT_FLAG_SGI
))
2030 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
2032 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
) {
2033 if (iterator
.this_arg
[3] == 1)
2035 IEEE80211_TX_RC_40_MHZ_WIDTH
;
2036 else if (iterator
.this_arg
[3] == 4)
2038 IEEE80211_TX_RC_80_MHZ_WIDTH
;
2039 else if (iterator
.this_arg
[3] == 11)
2041 IEEE80211_TX_RC_160_MHZ_WIDTH
;
2044 vht_mcs
= iterator
.this_arg
[4] >> 4;
2045 vht_nss
= iterator
.this_arg
[4] & 0xF;
2049 * Please update the file
2050 * Documentation/networking/mac80211-injection.txt
2051 * when parsing new fields here.
2059 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
2063 info
->control
.flags
|= IEEE80211_TX_CTRL_RATE_INJECT
;
2065 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
2066 info
->control
.rates
[i
].idx
= -1;
2067 info
->control
.rates
[i
].flags
= 0;
2068 info
->control
.rates
[i
].count
= 0;
2071 if (rate_flags
& IEEE80211_TX_RC_MCS
) {
2072 info
->control
.rates
[0].idx
= rate
;
2073 } else if (rate_flags
& IEEE80211_TX_RC_VHT_MCS
) {
2074 ieee80211_rate_set_vht(info
->control
.rates
, vht_mcs
,
2077 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
2078 if (rate
* 5 != sband
->bitrates
[i
].bitrate
)
2081 info
->control
.rates
[0].idx
= i
;
2086 if (info
->control
.rates
[0].idx
< 0)
2087 info
->control
.flags
&= ~IEEE80211_TX_CTRL_RATE_INJECT
;
2089 info
->control
.rates
[0].flags
= rate_flags
;
2090 info
->control
.rates
[0].count
= min_t(u8
, rate_retries
+ 1,
2091 local
->hw
.max_rate_tries
);
2095 * remove the radiotap header
2096 * iterator->_max_length was sanity-checked against
2097 * skb->len by iterator init
2099 skb_pull(skb
, iterator
._max_length
);
2104 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
2105 struct net_device
*dev
)
2107 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2108 struct ieee80211_chanctx_conf
*chanctx_conf
;
2109 struct ieee80211_radiotap_header
*prthdr
=
2110 (struct ieee80211_radiotap_header
*)skb
->data
;
2111 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2112 struct ieee80211_hdr
*hdr
;
2113 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
2114 struct cfg80211_chan_def
*chandef
;
2118 /* check for not even having the fixed radiotap header part */
2119 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
2120 goto fail
; /* too short to be possibly valid */
2122 /* is it a header version we can trust to find length from? */
2123 if (unlikely(prthdr
->it_version
))
2124 goto fail
; /* only version 0 is supported */
2126 /* then there must be a radiotap header with a length we can use */
2127 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
2129 /* does the skb contain enough to deliver on the alleged length? */
2130 if (unlikely(skb
->len
< len_rthdr
))
2131 goto fail
; /* skb too short for claimed rt header extent */
2134 * fix up the pointers accounting for the radiotap
2135 * header still being in there. We are being given
2136 * a precooked IEEE80211 header so no need for
2139 skb_set_mac_header(skb
, len_rthdr
);
2141 * these are just fixed to the end of the rt area since we
2142 * don't have any better information and at this point, nobody cares
2144 skb_set_network_header(skb
, len_rthdr
);
2145 skb_set_transport_header(skb
, len_rthdr
);
2147 if (skb
->len
< len_rthdr
+ 2)
2150 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
2151 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2153 if (skb
->len
< len_rthdr
+ hdrlen
)
2157 * Initialize skb->protocol if the injected frame is a data frame
2158 * carrying a rfc1042 header
2160 if (ieee80211_is_data(hdr
->frame_control
) &&
2161 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
2162 u8
*payload
= (u8
*)hdr
+ hdrlen
;
2164 if (ether_addr_equal(payload
, rfc1042_header
))
2165 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
2169 memset(info
, 0, sizeof(*info
));
2171 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
2172 IEEE80211_TX_CTL_INJECTED
;
2177 * We process outgoing injected frames that have a local address
2178 * we handle as though they are non-injected frames.
2179 * This code here isn't entirely correct, the local MAC address
2180 * isn't always enough to find the interface to use; for proper
2181 * VLAN/WDS support we will need a different mechanism (which
2182 * likely isn't going to be monitor interfaces).
2184 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2186 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
2187 if (!ieee80211_sdata_running(tmp_sdata
))
2189 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2190 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
2191 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
2193 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
2199 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2200 if (!chanctx_conf
) {
2201 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
2204 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
2208 chandef
= &chanctx_conf
->def
;
2209 else if (!local
->use_chanctx
)
2210 chandef
= &local
->_oper_chandef
;
2215 * Frame injection is not allowed if beaconing is not allowed
2216 * or if we need radar detection. Beaconing is usually not allowed when
2217 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2218 * Passive scan is also used in world regulatory domains where
2219 * your country is not known and as such it should be treated as
2220 * NO TX unless the channel is explicitly allowed in which case
2221 * your current regulatory domain would not have the passive scan
2224 * Since AP mode uses monitor interfaces to inject/TX management
2225 * frames we can make AP mode the exception to this rule once it
2226 * supports radar detection as its implementation can deal with
2227 * radar detection by itself. We can do that later by adding a
2228 * monitor flag interfaces used for AP support.
2230 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
2234 info
->band
= chandef
->chan
->band
;
2236 /* process and remove the injection radiotap header */
2237 if (!ieee80211_parse_tx_radiotap(local
, skb
))
2240 ieee80211_xmit(sdata
, NULL
, skb
);
2243 return NETDEV_TX_OK
;
2249 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
2252 static inline bool ieee80211_is_tdls_setup(struct sk_buff
*skb
)
2254 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2256 return ethertype
== ETH_P_TDLS
&&
2258 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
2261 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data
*sdata
,
2262 struct sk_buff
*skb
,
2263 struct sta_info
**sta_out
)
2265 struct sta_info
*sta
;
2267 switch (sdata
->vif
.type
) {
2268 case NL80211_IFTYPE_AP_VLAN
:
2269 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
2273 } else if (sdata
->wdev
.use_4addr
) {
2277 case NL80211_IFTYPE_AP
:
2278 case NL80211_IFTYPE_OCB
:
2279 case NL80211_IFTYPE_ADHOC
:
2280 if (is_multicast_ether_addr(skb
->data
)) {
2281 *sta_out
= ERR_PTR(-ENOENT
);
2284 sta
= sta_info_get_bss(sdata
, skb
->data
);
2286 case NL80211_IFTYPE_WDS
:
2287 sta
= sta_info_get(sdata
, sdata
->u
.wds
.remote_addr
);
2289 #ifdef CONFIG_MAC80211_MESH
2290 case NL80211_IFTYPE_MESH_POINT
:
2291 /* determined much later */
2295 case NL80211_IFTYPE_STATION
:
2296 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
2297 sta
= sta_info_get(sdata
, skb
->data
);
2298 if (sta
&& test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2299 if (test_sta_flag(sta
,
2300 WLAN_STA_TDLS_PEER_AUTH
)) {
2306 * TDLS link during setup - throw out frames to
2307 * peer. Allow TDLS-setup frames to unauthorized
2308 * peers for the special case of a link teardown
2309 * after a TDLS sta is removed due to being
2312 if (!ieee80211_is_tdls_setup(skb
))
2318 sta
= sta_info_get(sdata
, sdata
->u
.mgd
.bssid
);
2326 *sta_out
= sta
?: ERR_PTR(-ENOENT
);
2331 * ieee80211_build_hdr - build 802.11 header in the given frame
2332 * @sdata: virtual interface to build the header for
2333 * @skb: the skb to build the header in
2334 * @info_flags: skb flags to set
2336 * This function takes the skb with 802.3 header and reformats the header to
2337 * the appropriate IEEE 802.11 header based on which interface the packet is
2338 * being transmitted on.
2340 * Note that this function also takes care of the TX status request and
2341 * potential unsharing of the SKB - this needs to be interleaved with the
2344 * The function requires the read-side RCU lock held
2346 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2348 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
2349 struct sk_buff
*skb
, u32 info_flags
,
2350 struct sta_info
*sta
)
2352 struct ieee80211_local
*local
= sdata
->local
;
2353 struct ieee80211_tx_info
*info
;
2355 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
2357 struct ieee80211_hdr hdr
;
2358 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
2359 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
2360 const u8
*encaps_data
;
2361 int encaps_len
, skip_header_bytes
;
2362 bool wme_sta
= false, authorized
= false;
2366 struct ieee80211_chanctx_conf
*chanctx_conf
;
2367 struct ieee80211_sub_if_data
*ap_sdata
;
2368 enum nl80211_band band
;
2374 /* convert Ethernet header to proper 802.11 header (based on
2375 * operation mode) */
2376 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2377 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2379 switch (sdata
->vif
.type
) {
2380 case NL80211_IFTYPE_AP_VLAN
:
2381 if (sdata
->wdev
.use_4addr
) {
2382 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2384 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
2385 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2386 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2387 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2389 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2390 wme_sta
= sta
->sta
.wme
;
2392 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2394 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
2395 if (!chanctx_conf
) {
2399 band
= chanctx_conf
->def
.chan
->band
;
2400 if (sdata
->wdev
.use_4addr
)
2403 case NL80211_IFTYPE_AP
:
2404 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2405 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2406 if (!chanctx_conf
) {
2410 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2412 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2413 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2414 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2416 band
= chanctx_conf
->def
.chan
->band
;
2418 case NL80211_IFTYPE_WDS
:
2419 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2421 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
2422 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2423 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2424 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2427 * This is the exception! WDS style interfaces are prohibited
2428 * when channel contexts are in used so this must be valid
2430 band
= local
->hw
.conf
.chandef
.chan
->band
;
2432 #ifdef CONFIG_MAC80211_MESH
2433 case NL80211_IFTYPE_MESH_POINT
:
2434 if (!is_multicast_ether_addr(skb
->data
)) {
2435 struct sta_info
*next_hop
;
2436 bool mpp_lookup
= true;
2438 mpath
= mesh_path_lookup(sdata
, skb
->data
);
2441 next_hop
= rcu_dereference(mpath
->next_hop
);
2443 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
2444 MESH_PATH_RESOLVING
)))
2449 mppath
= mpp_path_lookup(sdata
, skb
->data
);
2451 mppath
->exp_time
= jiffies
;
2454 if (mppath
&& mpath
)
2455 mesh_path_del(sdata
, mpath
->dst
);
2459 * Use address extension if it is a packet from
2460 * another interface or if we know the destination
2461 * is being proxied by a portal (i.e. portal address
2462 * differs from proxied address)
2464 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
2465 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
2466 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2467 skb
->data
, skb
->data
+ ETH_ALEN
);
2468 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
2471 /* DS -> MBSS (802.11-2012 13.11.3.3).
2472 * For unicast with unknown forwarding information,
2473 * destination might be in the MBSS or if that fails
2474 * forwarded to another mesh gate. In either case
2475 * resolution will be handled in ieee80211_xmit(), so
2476 * leave the original DA. This also works for mcast */
2477 const u8
*mesh_da
= skb
->data
;
2480 mesh_da
= mppath
->mpp
;
2482 mesh_da
= mpath
->dst
;
2484 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2485 mesh_da
, sdata
->vif
.addr
);
2486 if (is_multicast_ether_addr(mesh_da
))
2487 /* DA TA mSA AE:SA */
2488 meshhdrlen
= ieee80211_new_mesh_header(
2490 skb
->data
+ ETH_ALEN
, NULL
);
2492 /* RA TA mDA mSA AE:DA SA */
2493 meshhdrlen
= ieee80211_new_mesh_header(
2494 sdata
, &mesh_hdr
, skb
->data
,
2495 skb
->data
+ ETH_ALEN
);
2498 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2499 if (!chanctx_conf
) {
2503 band
= chanctx_conf
->def
.chan
->band
;
2506 case NL80211_IFTYPE_STATION
:
2507 /* we already did checks when looking up the RA STA */
2508 tdls_peer
= test_sta_flag(sta
, WLAN_STA_TDLS_PEER
);
2512 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2513 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2514 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2516 } else if (sdata
->u
.mgd
.use_4addr
&&
2517 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2518 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2519 IEEE80211_FCTL_TODS
);
2521 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2522 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2523 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2524 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2527 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2529 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2530 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2531 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2534 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2535 if (!chanctx_conf
) {
2539 band
= chanctx_conf
->def
.chan
->band
;
2541 case NL80211_IFTYPE_OCB
:
2543 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2544 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2545 eth_broadcast_addr(hdr
.addr3
);
2547 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2548 if (!chanctx_conf
) {
2552 band
= chanctx_conf
->def
.chan
->band
;
2554 case NL80211_IFTYPE_ADHOC
:
2556 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2557 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2558 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2560 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2561 if (!chanctx_conf
) {
2565 band
= chanctx_conf
->def
.chan
->band
;
2572 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2574 /* sta is always NULL for mesh */
2576 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2577 wme_sta
= sta
->sta
.wme
;
2578 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2579 /* For mesh, the use of the QoS header is mandatory */
2583 /* receiver does QoS (which also means we do) use it */
2585 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2590 * Drop unicast frames to unauthorised stations unless they are
2591 * EAPOL frames from the local station.
2593 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2594 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2595 !multicast
&& !authorized
&&
2596 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2597 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2598 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2599 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2600 sdata
->name
, hdr
.addr1
);
2603 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2609 if (unlikely(!multicast
&& skb
->sk
&&
2610 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2611 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2614 unsigned long flags
;
2617 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2618 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2619 1, 0x10000, GFP_ATOMIC
);
2620 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2624 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2632 * If the skb is shared we need to obtain our own copy.
2634 if (skb_shared(skb
)) {
2635 struct sk_buff
*tmp_skb
= skb
;
2637 /* can't happen -- skb is a clone if info_id != 0 */
2640 skb
= skb_clone(skb
, GFP_ATOMIC
);
2649 hdr
.frame_control
= fc
;
2650 hdr
.duration_id
= 0;
2653 skip_header_bytes
= ETH_HLEN
;
2654 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2655 encaps_data
= bridge_tunnel_header
;
2656 encaps_len
= sizeof(bridge_tunnel_header
);
2657 skip_header_bytes
-= 2;
2658 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2659 encaps_data
= rfc1042_header
;
2660 encaps_len
= sizeof(rfc1042_header
);
2661 skip_header_bytes
-= 2;
2667 skb_pull(skb
, skip_header_bytes
);
2668 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2671 * So we need to modify the skb header and hence need a copy of
2672 * that. The head_need variable above doesn't, so far, include
2673 * the needed header space that we don't need right away. If we
2674 * can, then we don't reallocate right now but only after the
2675 * frame arrives at the master device (if it does...)
2677 * If we cannot, however, then we will reallocate to include all
2678 * the ever needed space. Also, if we need to reallocate it anyway,
2679 * make it big enough for everything we may ever need.
2682 if (head_need
> 0 || skb_cloned(skb
)) {
2683 head_need
+= sdata
->encrypt_headroom
;
2684 head_need
+= local
->tx_headroom
;
2685 head_need
= max_t(int, 0, head_need
);
2686 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2687 ieee80211_free_txskb(&local
->hw
, skb
);
2689 return ERR_PTR(-ENOMEM
);
2694 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2696 #ifdef CONFIG_MAC80211_MESH
2698 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2701 if (ieee80211_is_data_qos(fc
)) {
2702 __le16
*qos_control
;
2704 qos_control
= (__le16
*) skb_push(skb
, 2);
2705 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2707 * Maybe we could actually set some fields here, for now just
2708 * initialise to zero to indicate no special operation.
2712 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2714 skb_reset_mac_header(skb
);
2716 info
= IEEE80211_SKB_CB(skb
);
2717 memset(info
, 0, sizeof(*info
));
2719 info
->flags
= info_flags
;
2720 info
->ack_frame_id
= info_id
;
2726 return ERR_PTR(ret
);
2730 * fast-xmit overview
2732 * The core idea of this fast-xmit is to remove per-packet checks by checking
2733 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2734 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2735 * much less work can be done per packet. For example, fragmentation must be
2736 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2739 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2740 * header and other data to aid packet processing in ieee80211_xmit_fast().
2742 * The most difficult part of this is that when any of these assumptions
2743 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2744 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2745 * since the per-packet code no longer checks the conditions. This is reflected
2746 * by the calls to these functions throughout the rest of the code, and must be
2747 * maintained if any of the TX path checks change.
2750 void ieee80211_check_fast_xmit(struct sta_info
*sta
)
2752 struct ieee80211_fast_tx build
= {}, *fast_tx
= NULL
, *old
;
2753 struct ieee80211_local
*local
= sta
->local
;
2754 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
2755 struct ieee80211_hdr
*hdr
= (void *)build
.hdr
;
2756 struct ieee80211_chanctx_conf
*chanctx_conf
;
2759 if (!ieee80211_hw_check(&local
->hw
, SUPPORT_FAST_XMIT
))
2762 /* Locking here protects both the pointer itself, and against concurrent
2763 * invocations winning data access races to, e.g., the key pointer that
2765 * Without it, the invocation of this function right after the key
2766 * pointer changes wouldn't be sufficient, as another CPU could access
2767 * the pointer, then stall, and then do the cache update after the CPU
2768 * that invalidated the key.
2769 * With the locking, such scenarios cannot happen as the check for the
2770 * key and the fast-tx assignment are done atomically, so the CPU that
2771 * modifies the key will either wait or other one will see the key
2772 * cleared/changed already.
2774 spin_lock_bh(&sta
->lock
);
2775 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
2776 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2777 sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2780 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
2783 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
2784 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
2785 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
) ||
2786 test_sta_flag(sta
, WLAN_STA_CLEAR_PS_FILT
))
2789 if (sdata
->noack_map
)
2792 /* fast-xmit doesn't handle fragmentation at all */
2793 if (local
->hw
.wiphy
->frag_threshold
!= (u32
)-1 &&
2794 !ieee80211_hw_check(&local
->hw
, SUPPORTS_TX_FRAG
))
2798 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2799 if (!chanctx_conf
) {
2803 build
.band
= chanctx_conf
->def
.chan
->band
;
2806 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2808 switch (sdata
->vif
.type
) {
2809 case NL80211_IFTYPE_ADHOC
:
2811 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2812 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2813 memcpy(hdr
->addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2816 case NL80211_IFTYPE_STATION
:
2817 if (test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2819 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2820 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2821 memcpy(hdr
->addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2826 if (sdata
->u
.mgd
.use_4addr
) {
2827 /* non-regular ethertype cannot use the fastpath */
2828 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2829 IEEE80211_FCTL_TODS
);
2831 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2832 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2833 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2834 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2838 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2840 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2841 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2842 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2845 case NL80211_IFTYPE_AP_VLAN
:
2846 if (sdata
->wdev
.use_4addr
) {
2847 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2848 IEEE80211_FCTL_TODS
);
2850 memcpy(hdr
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
2851 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2852 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2853 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2858 case NL80211_IFTYPE_AP
:
2859 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2861 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2862 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2863 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2867 /* not handled on fast-xmit */
2873 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2876 /* We store the key here so there's no point in using rcu_dereference()
2877 * but that's fine because the code that changes the pointers will call
2878 * this function after doing so. For a single CPU that would be enough,
2879 * for multiple see the comment above.
2881 build
.key
= rcu_access_pointer(sta
->ptk
[sta
->ptk_idx
]);
2883 build
.key
= rcu_access_pointer(sdata
->default_unicast_key
);
2885 bool gen_iv
, iv_spc
, mmic
;
2887 gen_iv
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
;
2888 iv_spc
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
;
2889 mmic
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
;
2891 /* don't handle software crypto */
2892 if (!(build
.key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
2895 switch (build
.key
->conf
.cipher
) {
2896 case WLAN_CIPHER_SUITE_CCMP
:
2897 case WLAN_CIPHER_SUITE_CCMP_256
:
2898 /* add fixed key ID */
2900 (build
.hdr
+ build
.hdr_len
)[3] =
2901 0x20 | (build
.key
->conf
.keyidx
<< 6);
2902 build
.pn_offs
= build
.hdr_len
;
2904 if (gen_iv
|| iv_spc
)
2905 build
.hdr_len
+= IEEE80211_CCMP_HDR_LEN
;
2907 case WLAN_CIPHER_SUITE_GCMP
:
2908 case WLAN_CIPHER_SUITE_GCMP_256
:
2909 /* add fixed key ID */
2911 (build
.hdr
+ build
.hdr_len
)[3] =
2912 0x20 | (build
.key
->conf
.keyidx
<< 6);
2913 build
.pn_offs
= build
.hdr_len
;
2915 if (gen_iv
|| iv_spc
)
2916 build
.hdr_len
+= IEEE80211_GCMP_HDR_LEN
;
2918 case WLAN_CIPHER_SUITE_TKIP
:
2919 /* cannot handle MMIC or IV generation in xmit-fast */
2923 build
.hdr_len
+= IEEE80211_TKIP_IV_LEN
;
2925 case WLAN_CIPHER_SUITE_WEP40
:
2926 case WLAN_CIPHER_SUITE_WEP104
:
2927 /* cannot handle IV generation in fast-xmit */
2931 build
.hdr_len
+= IEEE80211_WEP_IV_LEN
;
2933 case WLAN_CIPHER_SUITE_AES_CMAC
:
2934 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
2935 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
2936 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
2938 "management cipher suite 0x%x enabled for data\n",
2939 build
.key
->conf
.cipher
);
2942 /* we don't know how to generate IVs for this at all */
2943 if (WARN_ON(gen_iv
))
2945 /* pure hardware keys are OK, of course */
2946 if (!(build
.key
->flags
& KEY_FLAG_CIPHER_SCHEME
))
2948 /* cipher scheme might require space allocation */
2950 build
.key
->conf
.iv_len
> IEEE80211_FAST_XMIT_MAX_IV
)
2953 build
.hdr_len
+= build
.key
->conf
.iv_len
;
2956 fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
2959 hdr
->frame_control
= fc
;
2961 memcpy(build
.hdr
+ build
.hdr_len
,
2962 rfc1042_header
, sizeof(rfc1042_header
));
2963 build
.hdr_len
+= sizeof(rfc1042_header
);
2965 fast_tx
= kmemdup(&build
, sizeof(build
), GFP_ATOMIC
);
2966 /* if the kmemdup fails, continue w/o fast_tx */
2971 /* we might have raced against another call to this function */
2972 old
= rcu_dereference_protected(sta
->fast_tx
,
2973 lockdep_is_held(&sta
->lock
));
2974 rcu_assign_pointer(sta
->fast_tx
, fast_tx
);
2976 kfree_rcu(old
, rcu_head
);
2977 spin_unlock_bh(&sta
->lock
);
2980 void ieee80211_check_fast_xmit_all(struct ieee80211_local
*local
)
2982 struct sta_info
*sta
;
2985 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
2986 ieee80211_check_fast_xmit(sta
);
2990 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data
*sdata
)
2992 struct ieee80211_local
*local
= sdata
->local
;
2993 struct sta_info
*sta
;
2997 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
2998 if (sdata
!= sta
->sdata
&&
2999 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
3001 ieee80211_check_fast_xmit(sta
);
3007 void ieee80211_clear_fast_xmit(struct sta_info
*sta
)
3009 struct ieee80211_fast_tx
*fast_tx
;
3011 spin_lock_bh(&sta
->lock
);
3012 fast_tx
= rcu_dereference_protected(sta
->fast_tx
,
3013 lockdep_is_held(&sta
->lock
));
3014 RCU_INIT_POINTER(sta
->fast_tx
, NULL
);
3015 spin_unlock_bh(&sta
->lock
);
3018 kfree_rcu(fast_tx
, rcu_head
);
3021 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local
*local
,
3022 struct sk_buff
*skb
, int headroom
,
3025 int amsdu_len
= *subframe_len
+ sizeof(struct ethhdr
);
3026 int padding
= (4 - amsdu_len
) & 3;
3028 if (skb_headroom(skb
) < headroom
|| skb_tailroom(skb
) < padding
) {
3029 I802_DEBUG_INC(local
->tx_expand_skb_head
);
3031 if (pskb_expand_head(skb
, headroom
, padding
, GFP_ATOMIC
)) {
3032 wiphy_debug(local
->hw
.wiphy
,
3033 "failed to reallocate TX buffer\n");
3039 *subframe_len
+= padding
;
3040 memset(skb_put(skb
, padding
), 0, padding
);
3046 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data
*sdata
,
3047 struct ieee80211_fast_tx
*fast_tx
,
3048 struct sk_buff
*skb
)
3050 struct ieee80211_local
*local
= sdata
->local
;
3051 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3052 struct ieee80211_hdr
*hdr
;
3053 struct ethhdr
*amsdu_hdr
;
3054 int hdr_len
= fast_tx
->hdr_len
- sizeof(rfc1042_header
);
3055 int subframe_len
= skb
->len
- hdr_len
;
3057 u8
*qc
, *h_80211_src
, *h_80211_dst
;
3060 if (info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
)
3063 if (info
->control
.flags
& IEEE80211_TX_CTRL_AMSDU
)
3066 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(*amsdu_hdr
),
3070 data
= skb_push(skb
, sizeof(*amsdu_hdr
));
3071 memmove(data
, data
+ sizeof(*amsdu_hdr
), hdr_len
);
3073 amsdu_hdr
= data
+ hdr_len
;
3074 /* h_80211_src/dst is addr* field within hdr */
3075 h_80211_src
= data
+ fast_tx
->sa_offs
;
3076 h_80211_dst
= data
+ fast_tx
->da_offs
;
3078 amsdu_hdr
->h_proto
= cpu_to_be16(subframe_len
);
3079 ether_addr_copy(amsdu_hdr
->h_source
, h_80211_src
);
3080 ether_addr_copy(amsdu_hdr
->h_dest
, h_80211_dst
);
3082 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3083 * fields needs to be changed to BSSID for A-MSDU frames depending
3084 * on FromDS/ToDS values.
3086 switch (sdata
->vif
.type
) {
3087 case NL80211_IFTYPE_STATION
:
3088 bssid
= sdata
->u
.mgd
.bssid
;
3090 case NL80211_IFTYPE_AP
:
3091 case NL80211_IFTYPE_AP_VLAN
:
3092 bssid
= sdata
->vif
.addr
;
3098 if (bssid
&& ieee80211_has_fromds(hdr
->frame_control
))
3099 ether_addr_copy(h_80211_src
, bssid
);
3101 if (bssid
&& ieee80211_has_tods(hdr
->frame_control
))
3102 ether_addr_copy(h_80211_dst
, bssid
);
3104 qc
= ieee80211_get_qos_ctl(hdr
);
3105 *qc
|= IEEE80211_QOS_CTL_A_MSDU_PRESENT
;
3107 info
->control
.flags
|= IEEE80211_TX_CTRL_AMSDU
;
3112 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data
*sdata
,
3113 struct sta_info
*sta
,
3114 struct ieee80211_fast_tx
*fast_tx
,
3115 struct sk_buff
*skb
)
3117 struct ieee80211_local
*local
= sdata
->local
;
3118 struct fq
*fq
= &local
->fq
;
3120 struct fq_flow
*flow
;
3121 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3122 struct ieee80211_txq
*txq
= sta
->sta
.txq
[tid
];
3123 struct txq_info
*txqi
;
3124 struct sk_buff
**frag_tail
, *head
;
3125 int subframe_len
= skb
->len
- ETH_ALEN
;
3126 u8 max_subframes
= sta
->sta
.max_amsdu_subframes
;
3127 int max_frags
= local
->hw
.max_tx_fragments
;
3128 int max_amsdu_len
= sta
->sta
.max_amsdu_len
;
3132 unsigned int orig_len
;
3135 if (!ieee80211_hw_check(&local
->hw
, TX_AMSDU
))
3141 txqi
= to_txq_info(txq
);
3142 if (test_bit(IEEE80211_TXQ_NO_AMSDU
, &txqi
->flags
))
3145 if (sta
->sta
.max_rc_amsdu_len
)
3146 max_amsdu_len
= min_t(int, max_amsdu_len
,
3147 sta
->sta
.max_rc_amsdu_len
);
3149 spin_lock_bh(&fq
->lock
);
3151 /* TODO: Ideally aggregation should be done on dequeue to remain
3152 * responsive to environment changes.
3156 flow
= fq_flow_classify(fq
, tin
, skb
, fq_flow_get_default_func
);
3157 head
= skb_peek_tail(&flow
->queue
);
3161 orig_len
= head
->len
;
3163 if (skb
->len
+ head
->len
> max_amsdu_len
)
3166 if (!ieee80211_amsdu_prepare_head(sdata
, fast_tx
, head
))
3169 nfrags
= 1 + skb_shinfo(skb
)->nr_frags
;
3170 nfrags
+= 1 + skb_shinfo(head
)->nr_frags
;
3171 frag_tail
= &skb_shinfo(head
)->frag_list
;
3172 while (*frag_tail
) {
3173 nfrags
+= 1 + skb_shinfo(*frag_tail
)->nr_frags
;
3174 frag_tail
= &(*frag_tail
)->next
;
3178 if (max_subframes
&& n
> max_subframes
)
3181 if (max_frags
&& nfrags
> max_frags
)
3184 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(rfc1042_header
) + 2,
3189 data
= skb_push(skb
, ETH_ALEN
+ 2);
3190 memmove(data
, data
+ ETH_ALEN
+ 2, 2 * ETH_ALEN
);
3192 data
+= 2 * ETH_ALEN
;
3193 len
= cpu_to_be16(subframe_len
);
3194 memcpy(data
, &len
, 2);
3195 memcpy(data
+ 2, rfc1042_header
, sizeof(rfc1042_header
));
3197 head
->len
+= skb
->len
;
3198 head
->data_len
+= skb
->len
;
3201 flow
->backlog
+= head
->len
- orig_len
;
3202 tin
->backlog_bytes
+= head
->len
- orig_len
;
3204 fq_recalc_backlog(fq
, tin
, flow
);
3207 spin_unlock_bh(&fq
->lock
);
3213 * Can be called while the sta lock is held. Anything that can cause packets to
3214 * be generated will cause deadlock!
3216 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data
*sdata
,
3217 struct sta_info
*sta
, u8 pn_offs
,
3218 struct ieee80211_key
*key
,
3219 struct sk_buff
*skb
)
3221 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3222 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3223 u8 tid
= IEEE80211_NUM_TIDS
;
3226 info
->control
.hw_key
= &key
->conf
;
3228 ieee80211_tx_stats(skb
->dev
, skb
->len
);
3230 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3231 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3232 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, tid
);
3234 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
3235 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence_number
);
3236 sdata
->sequence_number
+= 0x10;
3239 if (skb_shinfo(skb
)->gso_size
)
3240 sta
->tx_stats
.msdu
[tid
] +=
3241 DIV_ROUND_UP(skb
->len
, skb_shinfo(skb
)->gso_size
);
3243 sta
->tx_stats
.msdu
[tid
]++;
3245 info
->hw_queue
= sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
3247 /* statistics normally done by ieee80211_tx_h_stats (but that
3248 * has to consider fragmentation, so is more complex)
3250 sta
->tx_stats
.bytes
[skb_get_queue_mapping(skb
)] += skb
->len
;
3251 sta
->tx_stats
.packets
[skb_get_queue_mapping(skb
)]++;
3255 u8
*crypto_hdr
= skb
->data
+ pn_offs
;
3257 switch (key
->conf
.cipher
) {
3258 case WLAN_CIPHER_SUITE_CCMP
:
3259 case WLAN_CIPHER_SUITE_CCMP_256
:
3260 case WLAN_CIPHER_SUITE_GCMP
:
3261 case WLAN_CIPHER_SUITE_GCMP_256
:
3262 pn
= atomic64_inc_return(&key
->conf
.tx_pn
);
3264 crypto_hdr
[1] = pn
>> 8;
3265 crypto_hdr
[4] = pn
>> 16;
3266 crypto_hdr
[5] = pn
>> 24;
3267 crypto_hdr
[6] = pn
>> 32;
3268 crypto_hdr
[7] = pn
>> 40;
3274 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data
*sdata
,
3275 struct sta_info
*sta
,
3276 struct ieee80211_fast_tx
*fast_tx
,
3277 struct sk_buff
*skb
)
3279 struct ieee80211_local
*local
= sdata
->local
;
3280 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
3281 int extra_head
= fast_tx
->hdr_len
- (ETH_HLEN
- 2);
3282 int hw_headroom
= sdata
->local
->hw
.extra_tx_headroom
;
3284 struct ieee80211_tx_info
*info
;
3285 struct ieee80211_hdr
*hdr
= (void *)fast_tx
->hdr
;
3286 struct ieee80211_tx_data tx
;
3287 ieee80211_tx_result r
;
3288 struct tid_ampdu_tx
*tid_tx
= NULL
;
3289 u8 tid
= IEEE80211_NUM_TIDS
;
3291 /* control port protocol needs a lot of special handling */
3292 if (cpu_to_be16(ethertype
) == sdata
->control_port_protocol
)
3295 /* only RFC 1042 SNAP */
3296 if (ethertype
< ETH_P_802_3_MIN
)
3299 /* don't handle TX status request here either */
3300 if (skb
->sk
&& skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)
3303 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3304 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3305 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
3307 if (!test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
))
3309 if (tid_tx
->timeout
)
3310 tid_tx
->last_tx
= jiffies
;
3314 /* after this point (skb is modified) we cannot return false */
3316 if (skb_shared(skb
)) {
3317 struct sk_buff
*tmp_skb
= skb
;
3319 skb
= skb_clone(skb
, GFP_ATOMIC
);
3326 if ((hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) &&
3327 ieee80211_amsdu_aggregate(sdata
, sta
, fast_tx
, skb
))
3330 /* will not be crypto-handled beyond what we do here, so use false
3331 * as the may-encrypt argument for the resize to not account for
3332 * more room than we already have in 'extra_head'
3334 if (unlikely(ieee80211_skb_resize(sdata
, skb
,
3335 max_t(int, extra_head
+ hw_headroom
-
3336 skb_headroom(skb
), 0),
3342 memcpy(ð
, skb
->data
, ETH_HLEN
- 2);
3343 hdr
= (void *)skb_push(skb
, extra_head
);
3344 memcpy(skb
->data
, fast_tx
->hdr
, fast_tx
->hdr_len
);
3345 memcpy(skb
->data
+ fast_tx
->da_offs
, eth
.h_dest
, ETH_ALEN
);
3346 memcpy(skb
->data
+ fast_tx
->sa_offs
, eth
.h_source
, ETH_ALEN
);
3348 info
= IEEE80211_SKB_CB(skb
);
3349 memset(info
, 0, sizeof(*info
));
3350 info
->band
= fast_tx
->band
;
3351 info
->control
.vif
= &sdata
->vif
;
3352 info
->flags
= IEEE80211_TX_CTL_FIRST_FRAGMENT
|
3353 IEEE80211_TX_CTL_DONTFRAG
|
3354 (tid_tx
? IEEE80211_TX_CTL_AMPDU
: 0);
3355 info
->control
.flags
= IEEE80211_TX_CTRL_FAST_XMIT
;
3357 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3358 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3359 *ieee80211_get_qos_ctl(hdr
) = tid
;
3362 __skb_queue_head_init(&tx
.skbs
);
3364 tx
.flags
= IEEE80211_TX_UNICAST
;
3368 tx
.key
= fast_tx
->key
;
3370 if (!ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
3372 r
= ieee80211_tx_h_rate_ctrl(&tx
);
3376 if (r
!= TX_CONTINUE
) {
3383 if (ieee80211_queue_skb(local
, sdata
, sta
, skb
))
3386 ieee80211_xmit_fast_finish(sdata
, sta
, fast_tx
->pn_offs
,
3389 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3390 sdata
= container_of(sdata
->bss
,
3391 struct ieee80211_sub_if_data
, u
.ap
);
3393 __skb_queue_tail(&tx
.skbs
, skb
);
3394 ieee80211_tx_frags(local
, &sdata
->vif
, &sta
->sta
, &tx
.skbs
, false);
3398 struct sk_buff
*ieee80211_tx_dequeue(struct ieee80211_hw
*hw
,
3399 struct ieee80211_txq
*txq
)
3401 struct ieee80211_local
*local
= hw_to_local(hw
);
3402 struct txq_info
*txqi
= container_of(txq
, struct txq_info
, txq
);
3403 struct ieee80211_hdr
*hdr
;
3404 struct sk_buff
*skb
= NULL
;
3405 struct fq
*fq
= &local
->fq
;
3406 struct fq_tin
*tin
= &txqi
->tin
;
3407 struct ieee80211_tx_info
*info
;
3408 struct ieee80211_tx_data tx
;
3409 ieee80211_tx_result r
;
3411 spin_lock_bh(&fq
->lock
);
3413 if (test_bit(IEEE80211_TXQ_STOP
, &txqi
->flags
))
3416 /* Make sure fragments stay together. */
3417 skb
= __skb_dequeue(&txqi
->frags
);
3422 skb
= fq_tin_dequeue(fq
, tin
, fq_tin_dequeue_func
);
3426 ieee80211_set_skb_vif(skb
, txqi
);
3428 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3429 info
= IEEE80211_SKB_CB(skb
);
3431 memset(&tx
, 0, sizeof(tx
));
3432 __skb_queue_head_init(&tx
.skbs
);
3435 tx
.sdata
= vif_to_sdata(info
->control
.vif
);
3438 tx
.sta
= container_of(txq
->sta
, struct sta_info
, sta
);
3441 * The key can be removed while the packet was queued, so need to call
3442 * this here to get the current key.
3444 r
= ieee80211_tx_h_select_key(&tx
);
3445 if (r
!= TX_CONTINUE
) {
3446 ieee80211_free_txskb(&local
->hw
, skb
);
3450 if (test_bit(IEEE80211_TXQ_AMPDU
, &txqi
->flags
))
3451 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
3453 info
->flags
&= ~IEEE80211_TX_CTL_AMPDU
;
3455 if (info
->control
.flags
& IEEE80211_TX_CTRL_FAST_XMIT
) {
3456 struct sta_info
*sta
= container_of(txq
->sta
, struct sta_info
,
3461 (tx
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
))
3462 pn_offs
= ieee80211_hdrlen(hdr
->frame_control
);
3464 ieee80211_xmit_fast_finish(sta
->sdata
, sta
, pn_offs
,
3467 if (invoke_tx_handlers_late(&tx
))
3470 skb
= __skb_dequeue(&tx
.skbs
);
3472 if (!skb_queue_empty(&tx
.skbs
))
3473 skb_queue_splice_tail(&tx
.skbs
, &txqi
->frags
);
3476 if (skb
&& skb_has_frag_list(skb
) &&
3477 !ieee80211_hw_check(&local
->hw
, TX_FRAG_LIST
)) {
3478 if (skb_linearize(skb
)) {
3479 ieee80211_free_txskb(&local
->hw
, skb
);
3485 spin_unlock_bh(&fq
->lock
);
3489 EXPORT_SYMBOL(ieee80211_tx_dequeue
);
3491 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3492 struct net_device
*dev
,
3495 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
3496 struct sta_info
*sta
;
3497 struct sk_buff
*next
;
3499 if (unlikely(skb
->len
< ETH_HLEN
)) {
3506 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
))
3509 if (!IS_ERR_OR_NULL(sta
)) {
3510 struct ieee80211_fast_tx
*fast_tx
;
3512 fast_tx
= rcu_dereference(sta
->fast_tx
);
3515 ieee80211_xmit_fast(sdata
, sta
, fast_tx
, skb
))
3519 if (skb_is_gso(skb
)) {
3520 struct sk_buff
*segs
;
3522 segs
= skb_gso_segment(skb
, 0);
3530 /* we cannot process non-linear frames on this path */
3531 if (skb_linearize(skb
)) {
3536 /* the frame could be fragmented, software-encrypted, and other
3537 * things so we cannot really handle checksum offload with it -
3538 * fix it up in software before we handle anything else.
3540 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3541 skb_set_transport_header(skb
,
3542 skb_checksum_start_offset(skb
));
3543 if (skb_checksum_help(skb
))
3556 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3560 ieee80211_tx_stats(dev
, skb
->len
);
3562 ieee80211_xmit(sdata
, sta
, skb
);
3571 static int ieee80211_change_da(struct sk_buff
*skb
, struct sta_info
*sta
)
3576 err
= skb_ensure_writable(skb
, ETH_HLEN
);
3580 eth
= (void *)skb
->data
;
3581 ether_addr_copy(eth
->h_dest
, sta
->sta
.addr
);
3586 static bool ieee80211_multicast_to_unicast(struct sk_buff
*skb
,
3587 struct net_device
*dev
)
3589 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
3590 const struct ethhdr
*eth
= (void *)skb
->data
;
3591 const struct vlan_ethhdr
*ethvlan
= (void *)skb
->data
;
3594 if (likely(!is_multicast_ether_addr(eth
->h_dest
)))
3597 switch (sdata
->vif
.type
) {
3598 case NL80211_IFTYPE_AP_VLAN
:
3599 if (sdata
->u
.vlan
.sta
)
3601 if (sdata
->wdev
.use_4addr
)
3604 case NL80211_IFTYPE_AP
:
3605 /* check runtime toggle for this bss */
3606 if (!sdata
->bss
->multicast_to_unicast
)
3613 /* multicast to unicast conversion only for some payload */
3614 ethertype
= eth
->h_proto
;
3615 if (ethertype
== htons(ETH_P_8021Q
) && skb
->len
>= VLAN_ETH_HLEN
)
3616 ethertype
= ethvlan
->h_vlan_encapsulated_proto
;
3617 switch (ethertype
) {
3618 case htons(ETH_P_ARP
):
3619 case htons(ETH_P_IP
):
3620 case htons(ETH_P_IPV6
):
3630 ieee80211_convert_to_unicast(struct sk_buff
*skb
, struct net_device
*dev
,
3631 struct sk_buff_head
*queue
)
3633 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
3634 struct ieee80211_local
*local
= sdata
->local
;
3635 const struct ethhdr
*eth
= (struct ethhdr
*)skb
->data
;
3636 struct sta_info
*sta
, *first
= NULL
;
3637 struct sk_buff
*cloned_skb
;
3641 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
3642 if (sdata
!= sta
->sdata
)
3643 /* AP-VLAN mismatch */
3645 if (unlikely(ether_addr_equal(eth
->h_source
, sta
->sta
.addr
)))
3646 /* do not send back to source */
3652 cloned_skb
= skb_clone(skb
, GFP_ATOMIC
);
3655 if (unlikely(ieee80211_change_da(cloned_skb
, sta
))) {
3656 dev_kfree_skb(cloned_skb
);
3659 __skb_queue_tail(queue
, cloned_skb
);
3662 if (likely(first
)) {
3663 if (unlikely(ieee80211_change_da(skb
, first
)))
3665 __skb_queue_tail(queue
, skb
);
3667 /* no STA connected, drop */
3674 __skb_queue_purge(queue
);
3675 __skb_queue_tail(queue
, skb
);
3681 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3682 * @skb: packet to be sent
3683 * @dev: incoming interface
3685 * On failure skb will be freed.
3687 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3688 struct net_device
*dev
)
3690 if (unlikely(ieee80211_multicast_to_unicast(skb
, dev
))) {
3691 struct sk_buff_head queue
;
3693 __skb_queue_head_init(&queue
);
3694 ieee80211_convert_to_unicast(skb
, dev
, &queue
);
3695 while ((skb
= __skb_dequeue(&queue
)))
3696 __ieee80211_subif_start_xmit(skb
, dev
, 0);
3698 __ieee80211_subif_start_xmit(skb
, dev
, 0);
3701 return NETDEV_TX_OK
;
3705 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
3706 struct sk_buff
*skb
, u32 info_flags
)
3708 struct ieee80211_hdr
*hdr
;
3709 struct ieee80211_tx_data tx
= {
3710 .local
= sdata
->local
,
3713 struct sta_info
*sta
;
3717 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
)) {
3719 skb
= ERR_PTR(-EINVAL
);
3723 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3727 hdr
= (void *)skb
->data
;
3728 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
3731 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
3734 return ERR_PTR(-EINVAL
);
3743 * ieee80211_clear_tx_pending may not be called in a context where
3744 * it is possible that it packets could come in again.
3746 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
3748 struct sk_buff
*skb
;
3751 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3752 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
3753 ieee80211_free_txskb(&local
->hw
, skb
);
3758 * Returns false if the frame couldn't be transmitted but was queued instead,
3759 * which in this case means re-queued -- take as an indication to stop sending
3760 * more pending frames.
3762 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
3763 struct sk_buff
*skb
)
3765 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3766 struct ieee80211_sub_if_data
*sdata
;
3767 struct sta_info
*sta
;
3768 struct ieee80211_hdr
*hdr
;
3770 struct ieee80211_chanctx_conf
*chanctx_conf
;
3772 sdata
= vif_to_sdata(info
->control
.vif
);
3774 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
3775 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3776 if (unlikely(!chanctx_conf
)) {
3780 info
->band
= chanctx_conf
->def
.chan
->band
;
3781 result
= ieee80211_tx(sdata
, NULL
, skb
, true);
3783 struct sk_buff_head skbs
;
3785 __skb_queue_head_init(&skbs
);
3786 __skb_queue_tail(&skbs
, skb
);
3788 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3789 sta
= sta_info_get(sdata
, hdr
->addr1
);
3791 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
3798 * Transmit all pending packets. Called from tasklet.
3800 void ieee80211_tx_pending(unsigned long data
)
3802 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
3803 unsigned long flags
;
3809 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
3810 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3812 * If queue is stopped by something other than due to pending
3813 * frames, or we have no pending frames, proceed to next queue.
3815 if (local
->queue_stop_reasons
[i
] ||
3816 skb_queue_empty(&local
->pending
[i
]))
3819 while (!skb_queue_empty(&local
->pending
[i
])) {
3820 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
3821 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3823 if (WARN_ON(!info
->control
.vif
)) {
3824 ieee80211_free_txskb(&local
->hw
, skb
);
3828 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
3831 txok
= ieee80211_tx_pending_skb(local
, skb
);
3832 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
3838 if (skb_queue_empty(&local
->pending
[i
]))
3839 ieee80211_propagate_queue_wake(local
, i
);
3841 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
3846 /* functions for drivers to get certain frames */
3848 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3849 struct ps_data
*ps
, struct sk_buff
*skb
,
3854 int i
, have_bits
= 0, n1
, n2
;
3856 /* Generate bitmap for TIM only if there are any STAs in power save
3858 if (atomic_read(&ps
->num_sta_ps
) > 0)
3859 /* in the hope that this is faster than
3860 * checking byte-for-byte */
3861 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
3862 IEEE80211_MAX_AID
+1);
3864 if (ps
->dtim_count
== 0)
3865 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
3870 tim
= pos
= (u8
*) skb_put(skb
, 6);
3871 *pos
++ = WLAN_EID_TIM
;
3873 *pos
++ = ps
->dtim_count
;
3874 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
3876 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
3879 ps
->dtim_bc_mc
= aid0
== 1;
3882 /* Find largest even number N1 so that bits numbered 1 through
3883 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3884 * (N2 + 1) x 8 through 2007 are 0. */
3886 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
3893 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
3900 /* Bitmap control */
3902 /* Part Virt Bitmap */
3903 skb_put(skb
, n2
- n1
);
3904 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
3906 tim
[1] = n2
- n1
+ 4;
3908 *pos
++ = aid0
; /* Bitmap control */
3909 *pos
++ = 0; /* Part Virt Bitmap */
3913 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3914 struct ps_data
*ps
, struct sk_buff
*skb
,
3917 struct ieee80211_local
*local
= sdata
->local
;
3920 * Not very nice, but we want to allow the driver to call
3921 * ieee80211_beacon_get() as a response to the set_tim()
3922 * callback. That, however, is already invoked under the
3923 * sta_lock to guarantee consistent and race-free update
3924 * of the tim bitmap in mac80211 and the driver.
3926 if (local
->tim_in_locked_section
) {
3927 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3929 spin_lock_bh(&local
->tim_lock
);
3930 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3931 spin_unlock_bh(&local
->tim_lock
);
3937 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
3938 struct beacon_data
*beacon
)
3940 struct probe_resp
*resp
;
3942 size_t beacon_data_len
;
3944 u8 count
= beacon
->csa_current_counter
;
3946 switch (sdata
->vif
.type
) {
3947 case NL80211_IFTYPE_AP
:
3948 beacon_data
= beacon
->tail
;
3949 beacon_data_len
= beacon
->tail_len
;
3951 case NL80211_IFTYPE_ADHOC
:
3952 beacon_data
= beacon
->head
;
3953 beacon_data_len
= beacon
->head_len
;
3955 case NL80211_IFTYPE_MESH_POINT
:
3956 beacon_data
= beacon
->head
;
3957 beacon_data_len
= beacon
->head_len
;
3964 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
3965 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
3967 if (beacon
->csa_counter_offsets
[i
]) {
3968 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
3974 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
3977 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
3978 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
3983 static u8
__ieee80211_csa_update_counter(struct beacon_data
*beacon
)
3985 beacon
->csa_current_counter
--;
3987 /* the counter should never reach 0 */
3988 WARN_ON_ONCE(!beacon
->csa_current_counter
);
3990 return beacon
->csa_current_counter
;
3993 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
3995 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3996 struct beacon_data
*beacon
= NULL
;
4001 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
4002 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
4003 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
4004 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
4005 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
4006 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
4011 count
= __ieee80211_csa_update_counter(beacon
);
4017 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
4019 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
4021 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
4022 struct beacon_data
*beacon
= NULL
;
4024 size_t beacon_data_len
;
4027 if (!ieee80211_sdata_running(sdata
))
4031 if (vif
->type
== NL80211_IFTYPE_AP
) {
4032 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
4034 beacon
= rcu_dereference(ap
->beacon
);
4035 if (WARN_ON(!beacon
|| !beacon
->tail
))
4037 beacon_data
= beacon
->tail
;
4038 beacon_data_len
= beacon
->tail_len
;
4039 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
4040 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
4042 beacon
= rcu_dereference(ifibss
->presp
);
4046 beacon_data
= beacon
->head
;
4047 beacon_data_len
= beacon
->head_len
;
4048 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
4049 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
4051 beacon
= rcu_dereference(ifmsh
->beacon
);
4055 beacon_data
= beacon
->head
;
4056 beacon_data_len
= beacon
->head_len
;
4062 if (!beacon
->csa_counter_offsets
[0])
4065 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
4068 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
4075 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
4077 static struct sk_buff
*
4078 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
4079 struct ieee80211_vif
*vif
,
4080 struct ieee80211_mutable_offsets
*offs
,
4083 struct ieee80211_local
*local
= hw_to_local(hw
);
4084 struct beacon_data
*beacon
= NULL
;
4085 struct sk_buff
*skb
= NULL
;
4086 struct ieee80211_tx_info
*info
;
4087 struct ieee80211_sub_if_data
*sdata
= NULL
;
4088 enum nl80211_band band
;
4089 struct ieee80211_tx_rate_control txrc
;
4090 struct ieee80211_chanctx_conf
*chanctx_conf
;
4091 int csa_off_base
= 0;
4095 sdata
= vif_to_sdata(vif
);
4096 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
4098 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
4102 memset(offs
, 0, sizeof(*offs
));
4104 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
4105 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
4107 beacon
= rcu_dereference(ap
->beacon
);
4109 if (beacon
->csa_counter_offsets
[0]) {
4111 __ieee80211_csa_update_counter(beacon
);
4113 ieee80211_set_csa(sdata
, beacon
);
4117 * headroom, head length,
4118 * tail length and maximum TIM length
4120 skb
= dev_alloc_skb(local
->tx_headroom
+
4122 beacon
->tail_len
+ 256 +
4123 local
->hw
.extra_beacon_tailroom
);
4127 skb_reserve(skb
, local
->tx_headroom
);
4128 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4131 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
4135 offs
->tim_offset
= beacon
->head_len
;
4136 offs
->tim_length
= skb
->len
- beacon
->head_len
;
4138 /* for AP the csa offsets are from tail */
4139 csa_off_base
= skb
->len
;
4143 memcpy(skb_put(skb
, beacon
->tail_len
),
4144 beacon
->tail
, beacon
->tail_len
);
4147 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
4148 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
4149 struct ieee80211_hdr
*hdr
;
4151 beacon
= rcu_dereference(ifibss
->presp
);
4155 if (beacon
->csa_counter_offsets
[0]) {
4157 __ieee80211_csa_update_counter(beacon
);
4159 ieee80211_set_csa(sdata
, beacon
);
4162 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
4163 local
->hw
.extra_beacon_tailroom
);
4166 skb_reserve(skb
, local
->tx_headroom
);
4167 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4170 hdr
= (struct ieee80211_hdr
*) skb
->data
;
4171 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
4172 IEEE80211_STYPE_BEACON
);
4173 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
4174 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
4176 beacon
= rcu_dereference(ifmsh
->beacon
);
4180 if (beacon
->csa_counter_offsets
[0]) {
4182 /* TODO: For mesh csa_counter is in TU, so
4183 * decrementing it by one isn't correct, but
4184 * for now we leave it consistent with overall
4185 * mac80211's behavior.
4187 __ieee80211_csa_update_counter(beacon
);
4189 ieee80211_set_csa(sdata
, beacon
);
4192 if (ifmsh
->sync_ops
)
4193 ifmsh
->sync_ops
->adjust_tsf(sdata
, beacon
);
4195 skb
= dev_alloc_skb(local
->tx_headroom
+
4199 local
->hw
.extra_beacon_tailroom
);
4202 skb_reserve(skb
, local
->tx_headroom
);
4203 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4205 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
4208 offs
->tim_offset
= beacon
->head_len
;
4209 offs
->tim_length
= skb
->len
- beacon
->head_len
;
4212 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
4220 if (offs
&& beacon
) {
4223 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
4224 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
4229 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
4233 band
= chanctx_conf
->def
.chan
->band
;
4235 info
= IEEE80211_SKB_CB(skb
);
4237 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
4238 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
4241 memset(&txrc
, 0, sizeof(txrc
));
4243 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
4244 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
4246 txrc
.reported_rate
.idx
= -1;
4247 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
4249 rate_control_get_rate(sdata
, NULL
, &txrc
);
4251 info
->control
.vif
= vif
;
4253 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
4254 IEEE80211_TX_CTL_ASSIGN_SEQ
|
4255 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
4263 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
4264 struct ieee80211_vif
*vif
,
4265 struct ieee80211_mutable_offsets
*offs
)
4267 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
4269 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
4271 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
4272 struct ieee80211_vif
*vif
,
4273 u16
*tim_offset
, u16
*tim_length
)
4275 struct ieee80211_mutable_offsets offs
= {};
4276 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
4277 struct sk_buff
*copy
;
4278 struct ieee80211_supported_band
*sband
;
4285 *tim_offset
= offs
.tim_offset
;
4288 *tim_length
= offs
.tim_length
;
4290 if (ieee80211_hw_check(hw
, BEACON_TX_STATUS
) ||
4291 !hw_to_local(hw
)->monitors
)
4294 /* send a copy to monitor interfaces */
4295 copy
= skb_copy(bcn
, GFP_ATOMIC
);
4299 shift
= ieee80211_vif_get_shift(vif
);
4300 sband
= ieee80211_get_sband(vif_to_sdata(vif
));
4304 ieee80211_tx_monitor(hw_to_local(hw
), copy
, sband
, 1, shift
, false);
4308 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
4310 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
4311 struct ieee80211_vif
*vif
)
4313 struct ieee80211_if_ap
*ap
= NULL
;
4314 struct sk_buff
*skb
= NULL
;
4315 struct probe_resp
*presp
= NULL
;
4316 struct ieee80211_hdr
*hdr
;
4317 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
4319 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
4325 presp
= rcu_dereference(ap
->probe_resp
);
4329 skb
= dev_alloc_skb(presp
->len
);
4333 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
4335 hdr
= (struct ieee80211_hdr
*) skb
->data
;
4336 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
4342 EXPORT_SYMBOL(ieee80211_proberesp_get
);
4344 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
4345 struct ieee80211_vif
*vif
)
4347 struct ieee80211_sub_if_data
*sdata
;
4348 struct ieee80211_if_managed
*ifmgd
;
4349 struct ieee80211_pspoll
*pspoll
;
4350 struct ieee80211_local
*local
;
4351 struct sk_buff
*skb
;
4353 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4356 sdata
= vif_to_sdata(vif
);
4357 ifmgd
= &sdata
->u
.mgd
;
4358 local
= sdata
->local
;
4360 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
4364 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4366 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
4367 memset(pspoll
, 0, sizeof(*pspoll
));
4368 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
4369 IEEE80211_STYPE_PSPOLL
);
4370 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
4372 /* aid in PS-Poll has its two MSBs each set to 1 */
4373 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
4375 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
4376 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
4380 EXPORT_SYMBOL(ieee80211_pspoll_get
);
4382 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
4383 struct ieee80211_vif
*vif
)
4385 struct ieee80211_hdr_3addr
*nullfunc
;
4386 struct ieee80211_sub_if_data
*sdata
;
4387 struct ieee80211_if_managed
*ifmgd
;
4388 struct ieee80211_local
*local
;
4389 struct sk_buff
*skb
;
4391 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4394 sdata
= vif_to_sdata(vif
);
4395 ifmgd
= &sdata
->u
.mgd
;
4396 local
= sdata
->local
;
4398 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
4402 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4404 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
4406 memset(nullfunc
, 0, sizeof(*nullfunc
));
4407 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
4408 IEEE80211_STYPE_NULLFUNC
|
4409 IEEE80211_FCTL_TODS
);
4410 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
4411 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
4412 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
4416 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
4418 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
4420 const u8
*ssid
, size_t ssid_len
,
4423 struct ieee80211_local
*local
= hw_to_local(hw
);
4424 struct ieee80211_hdr_3addr
*hdr
;
4425 struct sk_buff
*skb
;
4429 ie_ssid_len
= 2 + ssid_len
;
4431 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
4432 ie_ssid_len
+ tailroom
);
4436 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4438 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
4439 memset(hdr
, 0, sizeof(*hdr
));
4440 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
4441 IEEE80211_STYPE_PROBE_REQ
);
4442 eth_broadcast_addr(hdr
->addr1
);
4443 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
4444 eth_broadcast_addr(hdr
->addr3
);
4446 pos
= skb_put(skb
, ie_ssid_len
);
4447 *pos
++ = WLAN_EID_SSID
;
4450 memcpy(pos
, ssid
, ssid_len
);
4455 EXPORT_SYMBOL(ieee80211_probereq_get
);
4457 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4458 const void *frame
, size_t frame_len
,
4459 const struct ieee80211_tx_info
*frame_txctl
,
4460 struct ieee80211_rts
*rts
)
4462 const struct ieee80211_hdr
*hdr
= frame
;
4464 rts
->frame_control
=
4465 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
4466 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
4468 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
4469 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
4471 EXPORT_SYMBOL(ieee80211_rts_get
);
4473 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4474 const void *frame
, size_t frame_len
,
4475 const struct ieee80211_tx_info
*frame_txctl
,
4476 struct ieee80211_cts
*cts
)
4478 const struct ieee80211_hdr
*hdr
= frame
;
4480 cts
->frame_control
=
4481 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
4482 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
4483 frame_len
, frame_txctl
);
4484 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
4486 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
4489 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
4490 struct ieee80211_vif
*vif
)
4492 struct ieee80211_local
*local
= hw_to_local(hw
);
4493 struct sk_buff
*skb
= NULL
;
4494 struct ieee80211_tx_data tx
;
4495 struct ieee80211_sub_if_data
*sdata
;
4497 struct ieee80211_tx_info
*info
;
4498 struct ieee80211_chanctx_conf
*chanctx_conf
;
4500 sdata
= vif_to_sdata(vif
);
4503 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
4508 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
4509 struct beacon_data
*beacon
=
4510 rcu_dereference(sdata
->u
.ap
.beacon
);
4512 if (!beacon
|| !beacon
->head
)
4515 ps
= &sdata
->u
.ap
.ps
;
4516 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
4517 ps
= &sdata
->u
.mesh
.ps
;
4522 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
4523 goto out
; /* send buffered bc/mc only after DTIM beacon */
4526 skb
= skb_dequeue(&ps
->bc_buf
);
4529 local
->total_ps_buffered
--;
4531 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
4532 struct ieee80211_hdr
*hdr
=
4533 (struct ieee80211_hdr
*) skb
->data
;
4534 /* more buffered multicast/broadcast frames ==> set
4535 * MoreData flag in IEEE 802.11 header to inform PS
4537 hdr
->frame_control
|=
4538 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
4541 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
4542 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
4543 if (!ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
))
4545 ieee80211_free_txskb(hw
, skb
);
4548 info
= IEEE80211_SKB_CB(skb
);
4550 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
4551 info
->band
= chanctx_conf
->def
.chan
->band
;
4553 if (invoke_tx_handlers(&tx
))
4560 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
4562 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4564 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4565 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4566 struct ieee80211_local
*local
= sdata
->local
;
4570 lockdep_assert_held(&local
->sta_mtx
);
4572 /* only some cases are supported right now */
4573 switch (sdata
->vif
.type
) {
4574 case NL80211_IFTYPE_STATION
:
4575 case NL80211_IFTYPE_AP
:
4576 case NL80211_IFTYPE_AP_VLAN
:
4583 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
4586 if (sta
->reserved_tid
== tid
) {
4591 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
4592 sdata_err(sdata
, "TID reservation already active\n");
4597 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
4598 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4602 /* Tear down BA sessions so we stop aggregating on this TID */
4603 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
)) {
4604 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4605 __ieee80211_stop_tx_ba_session(sta
, tid
,
4606 AGG_STOP_LOCAL_REQUEST
);
4609 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
4610 __ieee80211_flush_queues(local
, sdata
, queues
, false);
4612 sta
->reserved_tid
= tid
;
4614 ieee80211_wake_vif_queues(local
, sdata
,
4615 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4617 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
))
4618 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4624 EXPORT_SYMBOL(ieee80211_reserve_tid
);
4626 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4628 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4629 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4631 lockdep_assert_held(&sdata
->local
->sta_mtx
);
4633 /* only some cases are supported right now */
4634 switch (sdata
->vif
.type
) {
4635 case NL80211_IFTYPE_STATION
:
4636 case NL80211_IFTYPE_AP
:
4637 case NL80211_IFTYPE_AP_VLAN
:
4644 if (tid
!= sta
->reserved_tid
) {
4645 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
4649 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
4651 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
4653 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
4654 struct sk_buff
*skb
, int tid
,
4655 enum nl80211_band band
)
4657 int ac
= ieee80211_ac_from_tid(tid
);
4659 skb_reset_mac_header(skb
);
4660 skb_set_queue_mapping(skb
, ac
);
4661 skb
->priority
= tid
;
4663 skb
->dev
= sdata
->dev
;
4666 * The other path calling ieee80211_xmit is from the tasklet,
4667 * and while we can handle concurrent transmissions locking
4668 * requirements are that we do not come into tx with bhs on.
4671 IEEE80211_SKB_CB(skb
)->band
= band
;
4672 ieee80211_xmit(sdata
, NULL
, skb
);