2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
43 static inline void ieee80211_tx_stats(struct net_device
*dev
, u32 len
)
45 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
47 u64_stats_update_begin(&tstats
->syncp
);
49 tstats
->tx_bytes
+= len
;
50 u64_stats_update_end(&tstats
->syncp
);
53 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
54 struct sk_buff
*skb
, int group_addr
,
57 int rate
, mrate
, erp
, dur
, i
, shift
= 0;
58 struct ieee80211_rate
*txrate
;
59 struct ieee80211_local
*local
= tx
->local
;
60 struct ieee80211_supported_band
*sband
;
61 struct ieee80211_hdr
*hdr
;
62 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
63 struct ieee80211_chanctx_conf
*chanctx_conf
;
67 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
69 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
70 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
74 /* assume HW handles this */
75 if (tx
->rate
.flags
& (IEEE80211_TX_RC_MCS
| IEEE80211_TX_RC_VHT_MCS
))
79 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
82 sband
= local
->hw
.wiphy
->bands
[info
->band
];
83 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
85 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
88 * data and mgmt (except PS Poll):
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
104 hdr
= (struct ieee80211_hdr
*)skb
->data
;
105 if (ieee80211_is_ctl(hdr
->frame_control
)) {
106 /* TODO: These control frames are not currently sent by
107 * mac80211, but should they be implemented, this function
108 * needs to be updated to support duration field calculation.
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
118 * PS Poll: BIT(15) | BIT(14) | aid
124 if (0 /* FIX: data/mgmt during CFP */)
125 return cpu_to_le16(32768);
127 if (group_addr
) /* Group address as the destination - no ACK */
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141 /* use lowest available if everything fails */
142 mrate
= sband
->bitrates
[0].bitrate
;
143 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
144 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
146 if (r
->bitrate
> txrate
->bitrate
)
149 if ((rate_flags
& r
->flags
) != rate_flags
)
152 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
153 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
155 switch (sband
->band
) {
156 case NL80211_BAND_2GHZ
: {
158 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
159 flag
= IEEE80211_RATE_MANDATORY_G
;
161 flag
= IEEE80211_RATE_MANDATORY_B
;
166 case NL80211_BAND_5GHZ
:
167 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
170 case NL80211_BAND_60GHZ
:
171 /* TODO, for now fall through */
172 case NUM_NL80211_BANDS
:
178 /* No matching basic rate found; use highest suitable mandatory
180 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
185 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
191 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
192 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur
*= 2; /* ACK + SIFS */
200 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
201 txrate
->bitrate
, erp
,
202 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
206 return cpu_to_le16(dur
);
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
213 struct ieee80211_local
*local
= tx
->local
;
214 struct ieee80211_if_managed
*ifmgd
;
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
))
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
))
224 /* dynamic power save disabled */
225 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
228 /* we are scanning, don't enable power save */
232 if (!local
->ps_sdata
)
235 /* No point if we're going to suspend */
236 if (local
->quiescing
)
239 /* dynamic ps is supported only in managed mode */
240 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
243 ifmgd
= &tx
->sdata
->u
.mgd
;
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
258 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
259 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
260 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
263 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
264 ieee80211_stop_queues_by_reason(&local
->hw
,
265 IEEE80211_MAX_QUEUE_MAP
,
266 IEEE80211_QUEUE_STOP_REASON_PS
,
268 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
269 ieee80211_queue_work(&local
->hw
,
270 &local
->dynamic_ps_disable_work
);
273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd
->associated
)
277 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
278 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
287 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
288 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
291 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
294 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
296 !ieee80211_is_probe_req(hdr
->frame_control
) &&
297 !ieee80211_is_nullfunc(hdr
->frame_control
))
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
311 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
)
314 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
317 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
321 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
323 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
324 if (unlikely(!assoc
&&
325 ieee80211_is_data(hdr
->frame_control
))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 sdata_info(tx
->sdata
,
328 "dropped data frame to not associated station %pM\n",
331 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
334 } else if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
335 ieee80211_vif_get_num_mcast_if(tx
->sdata
) == 0)) {
337 * No associated STAs - no need to send multicast
346 /* This function is called whenever the AP is about to exceed the maximum limit
347 * of buffered frames for power saving STAs. This situation should not really
348 * happen often during normal operation, so dropping the oldest buffered packet
349 * from each queue should be OK to make some room for new frames. */
350 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
352 int total
= 0, purged
= 0;
354 struct ieee80211_sub_if_data
*sdata
;
355 struct sta_info
*sta
;
357 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
360 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
361 ps
= &sdata
->u
.ap
.ps
;
362 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
363 ps
= &sdata
->u
.mesh
.ps
;
367 skb
= skb_dequeue(&ps
->bc_buf
);
370 ieee80211_free_txskb(&local
->hw
, skb
);
372 total
+= skb_queue_len(&ps
->bc_buf
);
376 * Drop one frame from each station from the lowest-priority
377 * AC that has frames at all.
379 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
382 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
383 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
384 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
387 ieee80211_free_txskb(&local
->hw
, skb
);
393 local
->total_ps_buffered
= total
;
394 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
397 static ieee80211_tx_result
398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
400 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
401 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
405 * broadcast/multicast frame
407 * If any of the associated/peer stations is in power save mode,
408 * the frame is buffered to be sent after DTIM beacon frame.
409 * This is done either by the hardware or us.
412 /* powersaving STAs currently only in AP/VLAN/mesh mode */
413 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
414 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
418 ps
= &tx
->sdata
->bss
->ps
;
419 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
420 ps
= &tx
->sdata
->u
.mesh
.ps
;
426 /* no buffering for ordered frames */
427 if (ieee80211_has_order(hdr
->frame_control
))
430 if (ieee80211_is_probe_req(hdr
->frame_control
))
433 if (ieee80211_hw_check(&tx
->local
->hw
, QUEUE_CONTROL
))
434 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
436 /* no stations in PS mode */
437 if (!atomic_read(&ps
->num_sta_ps
))
440 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
442 /* device releases frame after DTIM beacon */
443 if (!ieee80211_hw_check(&tx
->local
->hw
, HOST_BROADCAST_PS_BUFFERING
))
446 /* buffered in mac80211 */
447 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
448 purge_old_ps_buffers(tx
->local
);
450 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
452 "BC TX buffer full - dropping the oldest frame\n");
453 ieee80211_free_txskb(&tx
->local
->hw
, skb_dequeue(&ps
->bc_buf
));
455 tx
->local
->total_ps_buffered
++;
457 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
462 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
465 if (!ieee80211_is_mgmt(fc
))
468 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
471 if (!ieee80211_is_robust_mgmt_frame(skb
))
477 static ieee80211_tx_result
478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
480 struct sta_info
*sta
= tx
->sta
;
481 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
482 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
483 struct ieee80211_local
*local
= tx
->local
;
488 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
489 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
490 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) &&
491 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
492 int ac
= skb_get_queue_mapping(tx
->skb
);
494 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
495 !ieee80211_is_bufferable_mmpdu(hdr
->frame_control
)) {
496 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
500 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
501 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
502 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
503 purge_old_ps_buffers(tx
->local
);
505 /* sync with ieee80211_sta_ps_deliver_wakeup */
506 spin_lock(&sta
->ps_lock
);
508 * STA woke up the meantime and all the frames on ps_tx_buf have
509 * been queued to pending queue. No reordering can happen, go
510 * ahead and Tx the packet.
512 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
513 !test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) &&
514 !test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) {
515 spin_unlock(&sta
->ps_lock
);
519 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
520 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
522 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 ieee80211_free_txskb(&local
->hw
, old
);
526 tx
->local
->total_ps_buffered
++;
528 info
->control
.jiffies
= jiffies
;
529 info
->control
.vif
= &tx
->sdata
->vif
;
530 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
531 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
532 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
533 spin_unlock(&sta
->ps_lock
);
535 if (!timer_pending(&local
->sta_cleanup
))
536 mod_timer(&local
->sta_cleanup
,
537 round_jiffies(jiffies
+
538 STA_INFO_CLEANUP_INTERVAL
));
541 * We queued up some frames, so the TIM bit might
542 * need to be set, recalculate it.
544 sta_info_recalc_tim(sta
);
547 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
549 "STA %pM in PS mode, but polling/in SP -> send frame\n",
556 static ieee80211_tx_result debug_noinline
557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
559 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
562 if (tx
->flags
& IEEE80211_TX_UNICAST
)
563 return ieee80211_tx_h_unicast_ps_buf(tx
);
565 return ieee80211_tx_h_multicast_ps_buf(tx
);
568 static ieee80211_tx_result debug_noinline
569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
571 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
573 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
574 if (tx
->sdata
->control_port_no_encrypt
)
575 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
576 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
577 info
->flags
|= IEEE80211_TX_CTL_USE_MINRATE
;
583 static ieee80211_tx_result debug_noinline
584 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
586 struct ieee80211_key
*key
;
587 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
588 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
590 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
593 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
595 else if (ieee80211_is_group_privacy_action(tx
->skb
) &&
596 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
598 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
599 is_multicast_ether_addr(hdr
->addr1
) &&
600 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
601 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
603 else if (is_multicast_ether_addr(hdr
->addr1
) &&
604 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
606 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
607 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
613 bool skip_hw
= false;
615 /* TODO: add threshold stuff again */
617 switch (tx
->key
->conf
.cipher
) {
618 case WLAN_CIPHER_SUITE_WEP40
:
619 case WLAN_CIPHER_SUITE_WEP104
:
620 case WLAN_CIPHER_SUITE_TKIP
:
621 if (!ieee80211_is_data_present(hdr
->frame_control
))
624 case WLAN_CIPHER_SUITE_CCMP
:
625 case WLAN_CIPHER_SUITE_CCMP_256
:
626 case WLAN_CIPHER_SUITE_GCMP
:
627 case WLAN_CIPHER_SUITE_GCMP_256
:
628 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
629 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
631 !ieee80211_is_group_privacy_action(tx
->skb
))
634 skip_hw
= (tx
->key
->conf
.flags
&
635 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
636 ieee80211_is_mgmt(hdr
->frame_control
);
638 case WLAN_CIPHER_SUITE_AES_CMAC
:
639 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
640 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
642 if (!ieee80211_is_mgmt(hdr
->frame_control
))
647 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
648 !ieee80211_is_deauth(hdr
->frame_control
)))
651 if (!skip_hw
&& tx
->key
&&
652 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
653 info
->control
.hw_key
= &tx
->key
->conf
;
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
662 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
663 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
664 struct ieee80211_supported_band
*sband
;
666 struct ieee80211_tx_rate_control txrc
;
667 struct ieee80211_sta_rates
*ratetbl
= NULL
;
670 memset(&txrc
, 0, sizeof(txrc
));
672 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
674 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
675 tx
->local
->hw
.wiphy
->frag_threshold
);
677 /* set up the tx rate control struct we give the RC algo */
678 txrc
.hw
= &tx
->local
->hw
;
680 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
682 txrc
.reported_rate
.idx
= -1;
683 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
684 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
685 txrc
.max_rate_idx
= -1;
687 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
689 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
690 txrc
.rate_idx_mcs_mask
=
691 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
693 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
694 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
695 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
696 tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
);
698 /* set up RTS protection if desired */
699 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
703 info
->control
.use_rts
= txrc
.rts
;
704 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
707 * Use short preamble if the BSS can handle it, but not for
708 * management frames unless we know the receiver can handle
709 * that -- the management frame might be to a station that
710 * just wants a probe response.
712 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
713 (ieee80211_is_data(hdr
->frame_control
) ||
714 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
715 txrc
.short_preamble
= true;
717 info
->control
.short_preamble
= txrc
.short_preamble
;
719 /* don't ask rate control when rate already injected via radiotap */
720 if (info
->control
.flags
& IEEE80211_TX_CTRL_RATE_INJECT
)
724 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
727 * Lets not bother rate control if we're associated and cannot
728 * talk to the sta. This should not happen.
730 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
731 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
732 "%s: Dropped data frame as no usable bitrate found while "
733 "scanning and associated. Target station: "
734 "%pM on %d GHz band\n",
735 tx
->sdata
->name
, hdr
->addr1
,
740 * If we're associated with the sta at this point we know we can at
741 * least send the frame at the lowest bit rate.
743 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
745 if (tx
->sta
&& !info
->control
.skip_table
)
746 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
748 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
750 struct ieee80211_tx_rate rate
= {
751 .idx
= ratetbl
->rate
[0].idx
,
752 .flags
= ratetbl
->rate
[0].flags
,
753 .count
= ratetbl
->rate
[0].count
756 if (ratetbl
->rate
[0].idx
< 0)
764 tx
->rate
= info
->control
.rates
[0];
767 if (txrc
.reported_rate
.idx
< 0) {
768 txrc
.reported_rate
= tx
->rate
;
769 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
770 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
772 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
777 if (unlikely(!info
->control
.rates
[0].count
))
778 info
->control
.rates
[0].count
= 1;
780 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
781 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
782 info
->control
.rates
[0].count
= 1;
787 static __le16
ieee80211_tx_next_seq(struct sta_info
*sta
, int tid
)
789 u16
*seq
= &sta
->tid_seq
[tid
];
790 __le16 ret
= cpu_to_le16(*seq
);
792 /* Increase the sequence number. */
793 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
801 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
802 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
807 * Packet injection may want to control the sequence
808 * number, if we have no matching interface then we
809 * neither assign one ourselves nor ask the driver to.
811 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
814 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
817 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
820 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
824 * Anything but QoS data that has a sequence number field
825 * (is long enough) gets a sequence number from the global
826 * counter. QoS data frames with a multicast destination
827 * also use the global counter (802.11-2012 9.3.2.10).
829 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
830 is_multicast_ether_addr(hdr
->addr1
)) {
831 /* driver should assign sequence number */
832 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
833 /* for pure STA mode without beacons, we can do it */
834 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
835 tx
->sdata
->sequence_number
+= 0x10;
837 tx
->sta
->tx_stats
.msdu
[IEEE80211_NUM_TIDS
]++;
842 * This should be true for injected/management frames only, for
843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 * above since they are not QoS-data frames.
849 /* include per-STA, per-TID sequence counter */
851 qc
= ieee80211_get_qos_ctl(hdr
);
852 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
853 tx
->sta
->tx_stats
.msdu
[tid
]++;
855 hdr
->seq_ctrl
= ieee80211_tx_next_seq(tx
->sta
, tid
);
860 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
861 struct sk_buff
*skb
, int hdrlen
,
864 struct ieee80211_local
*local
= tx
->local
;
865 struct ieee80211_tx_info
*info
;
867 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
868 int pos
= hdrlen
+ per_fragm
;
869 int rem
= skb
->len
- hdrlen
- per_fragm
;
871 if (WARN_ON(rem
< 0))
874 /* first fragment was already added to queue by caller */
877 int fraglen
= per_fragm
;
882 tmp
= dev_alloc_skb(local
->tx_headroom
+
884 tx
->sdata
->encrypt_headroom
+
885 IEEE80211_ENCRYPT_TAILROOM
);
889 __skb_queue_tail(&tx
->skbs
, tmp
);
892 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
894 /* copy control information */
895 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
897 info
= IEEE80211_SKB_CB(tmp
);
898 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
899 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
902 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
904 skb_copy_queue_mapping(tmp
, skb
);
905 tmp
->priority
= skb
->priority
;
908 /* copy header and data */
909 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
910 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
915 /* adjust first fragment's length */
916 skb_trim(skb
, hdrlen
+ per_fragm
);
920 static ieee80211_tx_result debug_noinline
921 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
923 struct sk_buff
*skb
= tx
->skb
;
924 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
925 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
926 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
930 /* no matter what happens, tx->skb moves to tx->skbs */
931 __skb_queue_tail(&tx
->skbs
, skb
);
934 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
937 if (ieee80211_hw_check(&tx
->local
->hw
, SUPPORTS_TX_FRAG
))
941 * Warn when submitting a fragmented A-MPDU frame and drop it.
942 * This scenario is handled in ieee80211_tx_prepare but extra
943 * caution taken here as fragmented ampdu may cause Tx stop.
945 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
948 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
950 /* internal error, why isn't DONTFRAG set? */
951 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
955 * Now fragment the frame. This will allocate all the fragments and
956 * chain them (using skb as the first fragment) to skb->next.
957 * During transmission, we will remove the successfully transmitted
958 * fragments from this list. When the low-level driver rejects one
959 * of the fragments then we will simply pretend to accept the skb
960 * but store it away as pending.
962 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
965 /* update duration/seq/flags of fragments */
968 skb_queue_walk(&tx
->skbs
, skb
) {
969 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
971 hdr
= (void *)skb
->data
;
972 info
= IEEE80211_SKB_CB(skb
);
974 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
975 hdr
->frame_control
|= morefrags
;
977 * No multi-rate retries for fragmented frames, that
978 * would completely throw off the NAV at other STAs.
980 info
->control
.rates
[1].idx
= -1;
981 info
->control
.rates
[2].idx
= -1;
982 info
->control
.rates
[3].idx
= -1;
983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
984 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
986 hdr
->frame_control
&= ~morefrags
;
988 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
995 static ieee80211_tx_result debug_noinline
996 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
1004 skb_queue_walk(&tx
->skbs
, skb
) {
1005 ac
= skb_get_queue_mapping(skb
);
1006 tx
->sta
->tx_stats
.bytes
[ac
] += skb
->len
;
1009 tx
->sta
->tx_stats
.packets
[ac
]++;
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1020 switch (tx
->key
->conf
.cipher
) {
1021 case WLAN_CIPHER_SUITE_WEP40
:
1022 case WLAN_CIPHER_SUITE_WEP104
:
1023 return ieee80211_crypto_wep_encrypt(tx
);
1024 case WLAN_CIPHER_SUITE_TKIP
:
1025 return ieee80211_crypto_tkip_encrypt(tx
);
1026 case WLAN_CIPHER_SUITE_CCMP
:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx
, IEEE80211_CCMP_MIC_LEN
);
1029 case WLAN_CIPHER_SUITE_CCMP_256
:
1030 return ieee80211_crypto_ccmp_encrypt(
1031 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1032 case WLAN_CIPHER_SUITE_AES_CMAC
:
1033 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1038 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1039 case WLAN_CIPHER_SUITE_GCMP
:
1040 case WLAN_CIPHER_SUITE_GCMP_256
:
1041 return ieee80211_crypto_gcmp_encrypt(tx
);
1043 return ieee80211_crypto_hw_encrypt(tx
);
1049 static ieee80211_tx_result debug_noinline
1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1052 struct sk_buff
*skb
;
1053 struct ieee80211_hdr
*hdr
;
1057 skb_queue_walk(&tx
->skbs
, skb
) {
1058 hdr
= (void *) skb
->data
;
1059 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1060 break; /* must not overwrite AID */
1061 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1062 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1063 next_len
= next
->len
;
1066 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1069 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1075 /* actual transmit path */
1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1078 struct sk_buff
*skb
,
1079 struct ieee80211_tx_info
*info
,
1080 struct tid_ampdu_tx
*tid_tx
,
1083 bool queued
= false;
1084 bool reset_agg_timer
= false;
1085 struct sk_buff
*purge_skb
= NULL
;
1087 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1088 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1089 reset_agg_timer
= true;
1090 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1092 * nothing -- this aggregation session is being started
1093 * but that might still fail with the driver
1095 } else if (!tx
->sta
->sta
.txq
[tid
]) {
1096 spin_lock(&tx
->sta
->lock
);
1098 * Need to re-check now, because we may get here
1100 * 1) in the window during which the setup is actually
1101 * already done, but not marked yet because not all
1102 * packets are spliced over to the driver pending
1103 * queue yet -- if this happened we acquire the lock
1104 * either before or after the splice happens, but
1105 * need to recheck which of these cases happened.
1107 * 2) during session teardown, if the OPERATIONAL bit
1108 * was cleared due to the teardown but the pointer
1109 * hasn't been assigned NULL yet (or we loaded it
1110 * before it was assigned) -- in this case it may
1111 * now be NULL which means we should just let the
1112 * packet pass through because splicing the frames
1113 * back is already done.
1115 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1118 /* do nothing, let packet pass through */
1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1120 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1121 reset_agg_timer
= true;
1124 if (info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
) {
1125 clear_sta_flag(tx
->sta
, WLAN_STA_SP
);
1126 ps_dbg(tx
->sta
->sdata
,
1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1128 tx
->sta
->sta
.addr
, tx
->sta
->sta
.aid
);
1130 info
->control
.vif
= &tx
->sdata
->vif
;
1131 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1132 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
1133 __skb_queue_tail(&tid_tx
->pending
, skb
);
1134 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1135 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1137 spin_unlock(&tx
->sta
->lock
);
1140 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1143 /* reset session timer */
1144 if (reset_agg_timer
&& tid_tx
->timeout
)
1145 tid_tx
->last_tx
= jiffies
;
1152 * pass %NULL for the station if unknown, a valid pointer if known
1153 * or an ERR_PTR() if the station is known not to exist
1155 static ieee80211_tx_result
1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1157 struct ieee80211_tx_data
*tx
,
1158 struct sta_info
*sta
, struct sk_buff
*skb
)
1160 struct ieee80211_local
*local
= sdata
->local
;
1161 struct ieee80211_hdr
*hdr
;
1162 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1166 memset(tx
, 0, sizeof(*tx
));
1170 __skb_queue_head_init(&tx
->skbs
);
1173 * If this flag is set to true anywhere, and we get here,
1174 * we are doing the needed processing, so remove the flag
1177 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1179 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1185 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1186 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1187 if (!tx
->sta
&& sdata
->wdev
.use_4addr
)
1189 } else if (info
->flags
& (IEEE80211_TX_INTFL_NL80211_FRAME_TX
|
1190 IEEE80211_TX_CTL_INJECTED
) ||
1191 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1192 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1194 if (!tx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
))
1195 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1198 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1199 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1200 ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
1201 !ieee80211_hw_check(&local
->hw
, TX_AMPDU_SETUP_IN_HW
)) {
1202 struct tid_ampdu_tx
*tid_tx
;
1204 qc
= ieee80211_get_qos_ctl(hdr
);
1205 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1207 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1211 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1214 if (unlikely(queued
))
1219 if (is_multicast_ether_addr(hdr
->addr1
)) {
1220 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1221 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1223 tx
->flags
|= IEEE80211_TX_UNICAST
;
1225 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1226 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1227 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1228 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1229 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1233 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1234 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
)) {
1235 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1236 ieee80211_check_fast_xmit(tx
->sta
);
1239 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1244 static struct txq_info
*ieee80211_get_txq(struct ieee80211_local
*local
,
1245 struct ieee80211_vif
*vif
,
1246 struct ieee80211_sta
*pubsta
,
1247 struct sk_buff
*skb
)
1249 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1250 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1251 struct ieee80211_txq
*txq
= NULL
;
1253 if ((info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
) ||
1254 (info
->control
.flags
& IEEE80211_TX_CTRL_PS_RESPONSE
))
1257 if (!ieee80211_is_data(hdr
->frame_control
))
1261 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TID_MASK
;
1263 txq
= pubsta
->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
= ieee802_1d_to_ac
[tid
& 7];
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
;
1506 struct ieee80211_sta
*pubsta
;
1508 if (!local
->ops
->wake_tx_queue
||
1509 sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)
1512 if (sta
&& sta
->uploaded
)
1517 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1518 sdata
= container_of(sdata
->bss
,
1519 struct ieee80211_sub_if_data
, u
.ap
);
1522 txqi
= ieee80211_get_txq(local
, vif
, pubsta
, skb
);
1527 spin_lock_bh(&fq
->lock
);
1528 ieee80211_txq_enqueue(local
, txqi
, skb
);
1529 spin_unlock_bh(&fq
->lock
);
1531 drv_wake_tx_queue(local
, txqi
);
1536 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1537 struct ieee80211_vif
*vif
,
1538 struct ieee80211_sta
*sta
,
1539 struct sk_buff_head
*skbs
,
1542 struct ieee80211_tx_control control
= {};
1543 struct sk_buff
*skb
, *tmp
;
1544 unsigned long flags
;
1546 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1547 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1548 int q
= info
->hw_queue
;
1550 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1551 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1552 __skb_unlink(skb
, skbs
);
1553 ieee80211_free_txskb(&local
->hw
, skb
);
1558 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1559 if (local
->queue_stop_reasons
[q
] ||
1560 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1561 if (unlikely(info
->flags
&
1562 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1563 if (local
->queue_stop_reasons
[q
] &
1564 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1566 * Drop off-channel frames if queues
1567 * are stopped for any reason other
1568 * than off-channel operation. Never
1571 spin_unlock_irqrestore(
1572 &local
->queue_stop_reason_lock
,
1574 ieee80211_purge_tx_queue(&local
->hw
,
1581 * Since queue is stopped, queue up frames for
1582 * later transmission from the tx-pending
1583 * tasklet when the queue is woken again.
1586 skb_queue_splice_init(skbs
,
1587 &local
->pending
[q
]);
1589 skb_queue_splice_tail_init(skbs
,
1590 &local
->pending
[q
]);
1592 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1597 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1599 info
->control
.vif
= vif
;
1602 __skb_unlink(skb
, skbs
);
1603 drv_tx(local
, &control
, skb
);
1610 * Returns false if the frame couldn't be transmitted but was queued instead.
1612 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1613 struct sk_buff_head
*skbs
, int led_len
,
1614 struct sta_info
*sta
, bool txpending
)
1616 struct ieee80211_tx_info
*info
;
1617 struct ieee80211_sub_if_data
*sdata
;
1618 struct ieee80211_vif
*vif
;
1619 struct ieee80211_sta
*pubsta
;
1620 struct sk_buff
*skb
;
1624 if (WARN_ON(skb_queue_empty(skbs
)))
1627 skb
= skb_peek(skbs
);
1628 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1629 info
= IEEE80211_SKB_CB(skb
);
1630 sdata
= vif_to_sdata(info
->control
.vif
);
1631 if (sta
&& !sta
->uploaded
)
1639 switch (sdata
->vif
.type
) {
1640 case NL80211_IFTYPE_MONITOR
:
1641 if (sdata
->u
.mntr
.flags
& MONITOR_FLAG_ACTIVE
) {
1645 sdata
= rcu_dereference(local
->monitor_sdata
);
1649 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1650 } else if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
)) {
1651 ieee80211_purge_tx_queue(&local
->hw
, skbs
);
1656 case NL80211_IFTYPE_AP_VLAN
:
1657 sdata
= container_of(sdata
->bss
,
1658 struct ieee80211_sub_if_data
, u
.ap
);
1665 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1668 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1670 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1676 * Invoke TX handlers, return 0 on success and non-zero if the
1677 * frame was dropped or queued.
1679 * The handlers are split into an early and late part. The latter is everything
1680 * that can be sensitive to reordering, and will be deferred to after packets
1681 * are dequeued from the intermediate queues (when they are enabled).
1683 static int invoke_tx_handlers_early(struct ieee80211_tx_data
*tx
)
1685 ieee80211_tx_result res
= TX_DROP
;
1687 #define CALL_TXH(txh) \
1690 if (res != TX_CONTINUE) \
1694 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1695 CALL_TXH(ieee80211_tx_h_check_assoc
);
1696 CALL_TXH(ieee80211_tx_h_ps_buf
);
1697 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1698 CALL_TXH(ieee80211_tx_h_select_key
);
1699 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1700 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1703 if (unlikely(res
== TX_DROP
)) {
1704 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1706 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1708 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1710 } else if (unlikely(res
== TX_QUEUED
)) {
1711 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1719 * Late handlers can be called while the sta lock is held. Handlers that can
1720 * cause packets to be generated will cause deadlock!
1722 static int invoke_tx_handlers_late(struct ieee80211_tx_data
*tx
)
1724 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1725 ieee80211_tx_result res
= TX_CONTINUE
;
1727 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1728 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1733 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1734 CALL_TXH(ieee80211_tx_h_sequence
);
1735 CALL_TXH(ieee80211_tx_h_fragment
);
1736 /* handlers after fragment must be aware of tx info fragmentation! */
1737 CALL_TXH(ieee80211_tx_h_stats
);
1738 CALL_TXH(ieee80211_tx_h_encrypt
);
1739 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1740 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1744 if (unlikely(res
== TX_DROP
)) {
1745 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1747 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1749 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1751 } else if (unlikely(res
== TX_QUEUED
)) {
1752 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1759 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1761 int r
= invoke_tx_handlers_early(tx
);
1765 return invoke_tx_handlers_late(tx
);
1768 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1769 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1770 int band
, struct ieee80211_sta
**sta
)
1772 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1773 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1774 struct ieee80211_tx_data tx
;
1775 struct sk_buff
*skb2
;
1777 if (ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
) == TX_DROP
)
1781 info
->control
.vif
= vif
;
1782 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1784 if (invoke_tx_handlers(&tx
))
1789 *sta
= &tx
.sta
->sta
;
1794 /* this function isn't suitable for fragmented data frames */
1795 skb2
= __skb_dequeue(&tx
.skbs
);
1796 if (WARN_ON(skb2
!= skb
|| !skb_queue_empty(&tx
.skbs
))) {
1797 ieee80211_free_txskb(hw
, skb2
);
1798 ieee80211_purge_tx_queue(hw
, &tx
.skbs
);
1804 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1807 * Returns false if the frame couldn't be transmitted but was queued instead.
1809 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1810 struct sta_info
*sta
, struct sk_buff
*skb
,
1813 struct ieee80211_local
*local
= sdata
->local
;
1814 struct ieee80211_tx_data tx
;
1815 ieee80211_tx_result res_prepare
;
1816 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1820 if (unlikely(skb
->len
< 10)) {
1825 /* initialises tx */
1827 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, sta
, skb
);
1829 if (unlikely(res_prepare
== TX_DROP
)) {
1830 ieee80211_free_txskb(&local
->hw
, skb
);
1832 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1836 /* set up hw_queue value early */
1837 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1838 !ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
1840 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1842 if (invoke_tx_handlers_early(&tx
))
1845 if (ieee80211_queue_skb(local
, sdata
, tx
.sta
, tx
.skb
))
1848 if (!invoke_tx_handlers_late(&tx
))
1849 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1855 /* device xmit handlers */
1857 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1858 struct sk_buff
*skb
,
1859 int head_need
, bool may_encrypt
)
1861 struct ieee80211_local
*local
= sdata
->local
;
1864 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1865 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1866 tail_need
-= skb_tailroom(skb
);
1867 tail_need
= max_t(int, tail_need
, 0);
1870 if (skb_cloned(skb
) &&
1871 (!ieee80211_hw_check(&local
->hw
, SUPPORTS_CLONED_SKBS
) ||
1872 !skb_clone_writable(skb
, ETH_HLEN
) ||
1873 (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
)))
1874 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1875 else if (head_need
|| tail_need
)
1876 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1880 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1881 wiphy_debug(local
->hw
.wiphy
,
1882 "failed to reallocate TX buffer\n");
1889 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1890 struct sta_info
*sta
, struct sk_buff
*skb
)
1892 struct ieee80211_local
*local
= sdata
->local
;
1893 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1894 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1898 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1900 headroom
= local
->tx_headroom
;
1902 headroom
+= sdata
->encrypt_headroom
;
1903 headroom
-= skb_headroom(skb
);
1904 headroom
= max_t(int, 0, headroom
);
1906 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1907 ieee80211_free_txskb(&local
->hw
, skb
);
1911 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1912 info
->control
.vif
= &sdata
->vif
;
1914 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1915 if (ieee80211_is_data(hdr
->frame_control
) &&
1916 is_unicast_ether_addr(hdr
->addr1
)) {
1917 if (mesh_nexthop_resolve(sdata
, skb
))
1918 return; /* skb queued: don't free */
1920 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1924 ieee80211_set_qos_hdr(sdata
, skb
);
1925 ieee80211_tx(sdata
, sta
, skb
, false);
1928 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local
*local
,
1929 struct sk_buff
*skb
)
1931 struct ieee80211_radiotap_iterator iterator
;
1932 struct ieee80211_radiotap_header
*rthdr
=
1933 (struct ieee80211_radiotap_header
*) skb
->data
;
1934 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1935 struct ieee80211_supported_band
*sband
=
1936 local
->hw
.wiphy
->bands
[info
->band
];
1937 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1941 bool rate_found
= false;
1942 u8 rate_retries
= 0;
1944 u8 mcs_known
, mcs_flags
, mcs_bw
;
1946 u8 vht_mcs
= 0, vht_nss
= 0;
1949 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1950 IEEE80211_TX_CTL_DONTFRAG
;
1953 * for every radiotap entry that is present
1954 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1955 * entries present, or -EINVAL on error)
1959 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1964 /* see if this argument is something we can use */
1965 switch (iterator
.this_arg_index
) {
1967 * You must take care when dereferencing iterator.this_arg
1968 * for multibyte types... the pointer is not aligned. Use
1969 * get_unaligned((type *)iterator.this_arg) to dereference
1970 * iterator.this_arg for type "type" safely on all arches.
1972 case IEEE80211_RADIOTAP_FLAGS
:
1973 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1975 * this indicates that the skb we have been
1976 * handed has the 32-bit FCS CRC at the end...
1977 * we should react to that by snipping it off
1978 * because it will be recomputed and added
1981 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1984 skb_trim(skb
, skb
->len
- FCS_LEN
);
1986 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1987 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1988 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1989 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1992 case IEEE80211_RADIOTAP_TX_FLAGS
:
1993 txflags
= get_unaligned_le16(iterator
.this_arg
);
1994 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1995 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1998 case IEEE80211_RADIOTAP_RATE
:
1999 rate
= *iterator
.this_arg
;
2004 case IEEE80211_RADIOTAP_DATA_RETRIES
:
2005 rate_retries
= *iterator
.this_arg
;
2008 case IEEE80211_RADIOTAP_MCS
:
2009 mcs_known
= iterator
.this_arg
[0];
2010 mcs_flags
= iterator
.this_arg
[1];
2011 if (!(mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_MCS
))
2015 rate
= iterator
.this_arg
[2];
2016 rate_flags
= IEEE80211_TX_RC_MCS
;
2018 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_GI
&&
2019 mcs_flags
& IEEE80211_RADIOTAP_MCS_SGI
)
2020 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
2022 mcs_bw
= mcs_flags
& IEEE80211_RADIOTAP_MCS_BW_MASK
;
2023 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_BW
&&
2024 mcs_bw
== IEEE80211_RADIOTAP_MCS_BW_40
)
2025 rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
2028 case IEEE80211_RADIOTAP_VHT
:
2029 vht_known
= get_unaligned_le16(iterator
.this_arg
);
2032 rate_flags
= IEEE80211_TX_RC_VHT_MCS
;
2033 if ((vht_known
& IEEE80211_RADIOTAP_VHT_KNOWN_GI
) &&
2034 (iterator
.this_arg
[2] &
2035 IEEE80211_RADIOTAP_VHT_FLAG_SGI
))
2036 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
2038 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
) {
2039 if (iterator
.this_arg
[3] == 1)
2041 IEEE80211_TX_RC_40_MHZ_WIDTH
;
2042 else if (iterator
.this_arg
[3] == 4)
2044 IEEE80211_TX_RC_80_MHZ_WIDTH
;
2045 else if (iterator
.this_arg
[3] == 11)
2047 IEEE80211_TX_RC_160_MHZ_WIDTH
;
2050 vht_mcs
= iterator
.this_arg
[4] >> 4;
2051 vht_nss
= iterator
.this_arg
[4] & 0xF;
2055 * Please update the file
2056 * Documentation/networking/mac80211-injection.txt
2057 * when parsing new fields here.
2065 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
2069 info
->control
.flags
|= IEEE80211_TX_CTRL_RATE_INJECT
;
2071 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
2072 info
->control
.rates
[i
].idx
= -1;
2073 info
->control
.rates
[i
].flags
= 0;
2074 info
->control
.rates
[i
].count
= 0;
2077 if (rate_flags
& IEEE80211_TX_RC_MCS
) {
2078 info
->control
.rates
[0].idx
= rate
;
2079 } else if (rate_flags
& IEEE80211_TX_RC_VHT_MCS
) {
2080 ieee80211_rate_set_vht(info
->control
.rates
, vht_mcs
,
2083 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
2084 if (rate
* 5 != sband
->bitrates
[i
].bitrate
)
2087 info
->control
.rates
[0].idx
= i
;
2092 if (info
->control
.rates
[0].idx
< 0)
2093 info
->control
.flags
&= ~IEEE80211_TX_CTRL_RATE_INJECT
;
2095 info
->control
.rates
[0].flags
= rate_flags
;
2096 info
->control
.rates
[0].count
= min_t(u8
, rate_retries
+ 1,
2097 local
->hw
.max_rate_tries
);
2101 * remove the radiotap header
2102 * iterator->_max_length was sanity-checked against
2103 * skb->len by iterator init
2105 skb_pull(skb
, iterator
._max_length
);
2110 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
2111 struct net_device
*dev
)
2113 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2114 struct ieee80211_chanctx_conf
*chanctx_conf
;
2115 struct ieee80211_radiotap_header
*prthdr
=
2116 (struct ieee80211_radiotap_header
*)skb
->data
;
2117 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2118 struct ieee80211_hdr
*hdr
;
2119 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
2120 struct cfg80211_chan_def
*chandef
;
2124 /* check for not even having the fixed radiotap header part */
2125 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
2126 goto fail
; /* too short to be possibly valid */
2128 /* is it a header version we can trust to find length from? */
2129 if (unlikely(prthdr
->it_version
))
2130 goto fail
; /* only version 0 is supported */
2132 /* then there must be a radiotap header with a length we can use */
2133 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
2135 /* does the skb contain enough to deliver on the alleged length? */
2136 if (unlikely(skb
->len
< len_rthdr
))
2137 goto fail
; /* skb too short for claimed rt header extent */
2140 * fix up the pointers accounting for the radiotap
2141 * header still being in there. We are being given
2142 * a precooked IEEE80211 header so no need for
2145 skb_set_mac_header(skb
, len_rthdr
);
2147 * these are just fixed to the end of the rt area since we
2148 * don't have any better information and at this point, nobody cares
2150 skb_set_network_header(skb
, len_rthdr
);
2151 skb_set_transport_header(skb
, len_rthdr
);
2153 if (skb
->len
< len_rthdr
+ 2)
2156 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
2157 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2159 if (skb
->len
< len_rthdr
+ hdrlen
)
2163 * Initialize skb->protocol if the injected frame is a data frame
2164 * carrying a rfc1042 header
2166 if (ieee80211_is_data(hdr
->frame_control
) &&
2167 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
2168 u8
*payload
= (u8
*)hdr
+ hdrlen
;
2170 if (ether_addr_equal(payload
, rfc1042_header
))
2171 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
2175 memset(info
, 0, sizeof(*info
));
2177 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
2178 IEEE80211_TX_CTL_INJECTED
;
2183 * We process outgoing injected frames that have a local address
2184 * we handle as though they are non-injected frames.
2185 * This code here isn't entirely correct, the local MAC address
2186 * isn't always enough to find the interface to use; for proper
2187 * VLAN/WDS support we will need a different mechanism (which
2188 * likely isn't going to be monitor interfaces).
2190 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2192 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
2193 if (!ieee80211_sdata_running(tmp_sdata
))
2195 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2196 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
2197 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
2199 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
2205 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2206 if (!chanctx_conf
) {
2207 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
2210 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
2214 chandef
= &chanctx_conf
->def
;
2215 else if (!local
->use_chanctx
)
2216 chandef
= &local
->_oper_chandef
;
2221 * Frame injection is not allowed if beaconing is not allowed
2222 * or if we need radar detection. Beaconing is usually not allowed when
2223 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2224 * Passive scan is also used in world regulatory domains where
2225 * your country is not known and as such it should be treated as
2226 * NO TX unless the channel is explicitly allowed in which case
2227 * your current regulatory domain would not have the passive scan
2230 * Since AP mode uses monitor interfaces to inject/TX management
2231 * frames we can make AP mode the exception to this rule once it
2232 * supports radar detection as its implementation can deal with
2233 * radar detection by itself. We can do that later by adding a
2234 * monitor flag interfaces used for AP support.
2236 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
2240 info
->band
= chandef
->chan
->band
;
2242 /* process and remove the injection radiotap header */
2243 if (!ieee80211_parse_tx_radiotap(local
, skb
))
2246 ieee80211_xmit(sdata
, NULL
, skb
);
2249 return NETDEV_TX_OK
;
2255 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
2258 static inline bool ieee80211_is_tdls_setup(struct sk_buff
*skb
)
2260 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2262 return ethertype
== ETH_P_TDLS
&&
2264 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
2267 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data
*sdata
,
2268 struct sk_buff
*skb
,
2269 struct sta_info
**sta_out
)
2271 struct sta_info
*sta
;
2273 switch (sdata
->vif
.type
) {
2274 case NL80211_IFTYPE_AP_VLAN
:
2275 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
2279 } else if (sdata
->wdev
.use_4addr
) {
2283 case NL80211_IFTYPE_AP
:
2284 case NL80211_IFTYPE_OCB
:
2285 case NL80211_IFTYPE_ADHOC
:
2286 if (is_multicast_ether_addr(skb
->data
)) {
2287 *sta_out
= ERR_PTR(-ENOENT
);
2290 sta
= sta_info_get_bss(sdata
, skb
->data
);
2292 case NL80211_IFTYPE_WDS
:
2293 sta
= sta_info_get(sdata
, sdata
->u
.wds
.remote_addr
);
2295 #ifdef CONFIG_MAC80211_MESH
2296 case NL80211_IFTYPE_MESH_POINT
:
2297 /* determined much later */
2301 case NL80211_IFTYPE_STATION
:
2302 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
2303 sta
= sta_info_get(sdata
, skb
->data
);
2304 if (sta
&& test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2305 if (test_sta_flag(sta
,
2306 WLAN_STA_TDLS_PEER_AUTH
)) {
2312 * TDLS link during setup - throw out frames to
2313 * peer. Allow TDLS-setup frames to unauthorized
2314 * peers for the special case of a link teardown
2315 * after a TDLS sta is removed due to being
2318 if (!ieee80211_is_tdls_setup(skb
))
2324 sta
= sta_info_get(sdata
, sdata
->u
.mgd
.bssid
);
2332 *sta_out
= sta
?: ERR_PTR(-ENOENT
);
2337 * ieee80211_build_hdr - build 802.11 header in the given frame
2338 * @sdata: virtual interface to build the header for
2339 * @skb: the skb to build the header in
2340 * @info_flags: skb flags to set
2342 * This function takes the skb with 802.3 header and reformats the header to
2343 * the appropriate IEEE 802.11 header based on which interface the packet is
2344 * being transmitted on.
2346 * Note that this function also takes care of the TX status request and
2347 * potential unsharing of the SKB - this needs to be interleaved with the
2350 * The function requires the read-side RCU lock held
2352 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2354 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
2355 struct sk_buff
*skb
, u32 info_flags
,
2356 struct sta_info
*sta
)
2358 struct ieee80211_local
*local
= sdata
->local
;
2359 struct ieee80211_tx_info
*info
;
2361 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
2363 struct ieee80211_hdr hdr
;
2364 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
2365 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
2366 const u8
*encaps_data
;
2367 int encaps_len
, skip_header_bytes
;
2368 bool wme_sta
= false, authorized
= false;
2372 struct ieee80211_chanctx_conf
*chanctx_conf
;
2373 struct ieee80211_sub_if_data
*ap_sdata
;
2374 enum nl80211_band band
;
2380 /* convert Ethernet header to proper 802.11 header (based on
2381 * operation mode) */
2382 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2383 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2385 switch (sdata
->vif
.type
) {
2386 case NL80211_IFTYPE_AP_VLAN
:
2387 if (sdata
->wdev
.use_4addr
) {
2388 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2390 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
2391 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2392 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2393 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2395 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2396 wme_sta
= sta
->sta
.wme
;
2398 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2400 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
2401 if (!chanctx_conf
) {
2405 band
= chanctx_conf
->def
.chan
->band
;
2406 if (sdata
->wdev
.use_4addr
)
2409 case NL80211_IFTYPE_AP
:
2410 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2411 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2412 if (!chanctx_conf
) {
2416 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2418 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2419 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2420 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2422 band
= chanctx_conf
->def
.chan
->band
;
2424 case NL80211_IFTYPE_WDS
:
2425 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2427 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
2428 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2429 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2430 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2433 * This is the exception! WDS style interfaces are prohibited
2434 * when channel contexts are in used so this must be valid
2436 band
= local
->hw
.conf
.chandef
.chan
->band
;
2438 #ifdef CONFIG_MAC80211_MESH
2439 case NL80211_IFTYPE_MESH_POINT
:
2440 if (!is_multicast_ether_addr(skb
->data
)) {
2441 struct sta_info
*next_hop
;
2442 bool mpp_lookup
= true;
2444 mpath
= mesh_path_lookup(sdata
, skb
->data
);
2447 next_hop
= rcu_dereference(mpath
->next_hop
);
2449 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
2450 MESH_PATH_RESOLVING
)))
2455 mppath
= mpp_path_lookup(sdata
, skb
->data
);
2457 mppath
->exp_time
= jiffies
;
2460 if (mppath
&& mpath
)
2461 mesh_path_del(sdata
, mpath
->dst
);
2465 * Use address extension if it is a packet from
2466 * another interface or if we know the destination
2467 * is being proxied by a portal (i.e. portal address
2468 * differs from proxied address)
2470 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
2471 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
2472 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2473 skb
->data
, skb
->data
+ ETH_ALEN
);
2474 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
2477 /* DS -> MBSS (802.11-2012 13.11.3.3).
2478 * For unicast with unknown forwarding information,
2479 * destination might be in the MBSS or if that fails
2480 * forwarded to another mesh gate. In either case
2481 * resolution will be handled in ieee80211_xmit(), so
2482 * leave the original DA. This also works for mcast */
2483 const u8
*mesh_da
= skb
->data
;
2486 mesh_da
= mppath
->mpp
;
2488 mesh_da
= mpath
->dst
;
2490 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2491 mesh_da
, sdata
->vif
.addr
);
2492 if (is_multicast_ether_addr(mesh_da
))
2493 /* DA TA mSA AE:SA */
2494 meshhdrlen
= ieee80211_new_mesh_header(
2496 skb
->data
+ ETH_ALEN
, NULL
);
2498 /* RA TA mDA mSA AE:DA SA */
2499 meshhdrlen
= ieee80211_new_mesh_header(
2500 sdata
, &mesh_hdr
, skb
->data
,
2501 skb
->data
+ ETH_ALEN
);
2504 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2505 if (!chanctx_conf
) {
2509 band
= chanctx_conf
->def
.chan
->band
;
2512 case NL80211_IFTYPE_STATION
:
2513 /* we already did checks when looking up the RA STA */
2514 tdls_peer
= test_sta_flag(sta
, WLAN_STA_TDLS_PEER
);
2518 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2519 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2520 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2522 } else if (sdata
->u
.mgd
.use_4addr
&&
2523 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2524 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2525 IEEE80211_FCTL_TODS
);
2527 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2528 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2529 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2530 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2533 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2535 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2536 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2537 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2540 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2541 if (!chanctx_conf
) {
2545 band
= chanctx_conf
->def
.chan
->band
;
2547 case NL80211_IFTYPE_OCB
:
2549 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2550 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2551 eth_broadcast_addr(hdr
.addr3
);
2553 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2554 if (!chanctx_conf
) {
2558 band
= chanctx_conf
->def
.chan
->band
;
2560 case NL80211_IFTYPE_ADHOC
:
2562 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2563 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2564 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2566 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2567 if (!chanctx_conf
) {
2571 band
= chanctx_conf
->def
.chan
->band
;
2578 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2580 /* sta is always NULL for mesh */
2582 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2583 wme_sta
= sta
->sta
.wme
;
2584 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2585 /* For mesh, the use of the QoS header is mandatory */
2589 /* receiver does QoS (which also means we do) use it */
2591 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2596 * Drop unicast frames to unauthorised stations unless they are
2597 * EAPOL frames from the local station.
2599 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2600 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2601 !multicast
&& !authorized
&&
2602 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2603 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2604 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2605 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2606 sdata
->name
, hdr
.addr1
);
2609 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2615 if (unlikely(!multicast
&& skb
->sk
&&
2616 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2617 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2620 unsigned long flags
;
2623 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2624 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2625 1, 0x10000, GFP_ATOMIC
);
2626 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2630 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2638 * If the skb is shared we need to obtain our own copy.
2640 if (skb_shared(skb
)) {
2641 struct sk_buff
*tmp_skb
= skb
;
2643 /* can't happen -- skb is a clone if info_id != 0 */
2646 skb
= skb_clone(skb
, GFP_ATOMIC
);
2655 hdr
.frame_control
= fc
;
2656 hdr
.duration_id
= 0;
2659 skip_header_bytes
= ETH_HLEN
;
2660 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2661 encaps_data
= bridge_tunnel_header
;
2662 encaps_len
= sizeof(bridge_tunnel_header
);
2663 skip_header_bytes
-= 2;
2664 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2665 encaps_data
= rfc1042_header
;
2666 encaps_len
= sizeof(rfc1042_header
);
2667 skip_header_bytes
-= 2;
2673 skb_pull(skb
, skip_header_bytes
);
2674 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2677 * So we need to modify the skb header and hence need a copy of
2678 * that. The head_need variable above doesn't, so far, include
2679 * the needed header space that we don't need right away. If we
2680 * can, then we don't reallocate right now but only after the
2681 * frame arrives at the master device (if it does...)
2683 * If we cannot, however, then we will reallocate to include all
2684 * the ever needed space. Also, if we need to reallocate it anyway,
2685 * make it big enough for everything we may ever need.
2688 if (head_need
> 0 || skb_cloned(skb
)) {
2689 head_need
+= sdata
->encrypt_headroom
;
2690 head_need
+= local
->tx_headroom
;
2691 head_need
= max_t(int, 0, head_need
);
2692 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2693 ieee80211_free_txskb(&local
->hw
, skb
);
2695 return ERR_PTR(-ENOMEM
);
2700 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2702 #ifdef CONFIG_MAC80211_MESH
2704 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2707 if (ieee80211_is_data_qos(fc
)) {
2708 __le16
*qos_control
;
2710 qos_control
= (__le16
*) skb_push(skb
, 2);
2711 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2713 * Maybe we could actually set some fields here, for now just
2714 * initialise to zero to indicate no special operation.
2718 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2720 skb_reset_mac_header(skb
);
2722 info
= IEEE80211_SKB_CB(skb
);
2723 memset(info
, 0, sizeof(*info
));
2725 info
->flags
= info_flags
;
2726 info
->ack_frame_id
= info_id
;
2732 return ERR_PTR(ret
);
2736 * fast-xmit overview
2738 * The core idea of this fast-xmit is to remove per-packet checks by checking
2739 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2740 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2741 * much less work can be done per packet. For example, fragmentation must be
2742 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2745 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2746 * header and other data to aid packet processing in ieee80211_xmit_fast().
2748 * The most difficult part of this is that when any of these assumptions
2749 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2750 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2751 * since the per-packet code no longer checks the conditions. This is reflected
2752 * by the calls to these functions throughout the rest of the code, and must be
2753 * maintained if any of the TX path checks change.
2756 void ieee80211_check_fast_xmit(struct sta_info
*sta
)
2758 struct ieee80211_fast_tx build
= {}, *fast_tx
= NULL
, *old
;
2759 struct ieee80211_local
*local
= sta
->local
;
2760 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
2761 struct ieee80211_hdr
*hdr
= (void *)build
.hdr
;
2762 struct ieee80211_chanctx_conf
*chanctx_conf
;
2765 if (!ieee80211_hw_check(&local
->hw
, SUPPORT_FAST_XMIT
))
2768 /* Locking here protects both the pointer itself, and against concurrent
2769 * invocations winning data access races to, e.g., the key pointer that
2771 * Without it, the invocation of this function right after the key
2772 * pointer changes wouldn't be sufficient, as another CPU could access
2773 * the pointer, then stall, and then do the cache update after the CPU
2774 * that invalidated the key.
2775 * With the locking, such scenarios cannot happen as the check for the
2776 * key and the fast-tx assignment are done atomically, so the CPU that
2777 * modifies the key will either wait or other one will see the key
2778 * cleared/changed already.
2780 spin_lock_bh(&sta
->lock
);
2781 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
2782 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2783 sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2786 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
2789 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
2790 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
2791 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
) ||
2792 test_sta_flag(sta
, WLAN_STA_CLEAR_PS_FILT
))
2795 if (sdata
->noack_map
)
2798 /* fast-xmit doesn't handle fragmentation at all */
2799 if (local
->hw
.wiphy
->frag_threshold
!= (u32
)-1 &&
2800 !ieee80211_hw_check(&local
->hw
, SUPPORTS_TX_FRAG
))
2804 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2805 if (!chanctx_conf
) {
2809 build
.band
= chanctx_conf
->def
.chan
->band
;
2812 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2814 switch (sdata
->vif
.type
) {
2815 case NL80211_IFTYPE_ADHOC
:
2817 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2818 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2819 memcpy(hdr
->addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2822 case NL80211_IFTYPE_STATION
:
2823 if (test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2825 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2826 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2827 memcpy(hdr
->addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2832 if (sdata
->u
.mgd
.use_4addr
) {
2833 /* non-regular ethertype cannot use the fastpath */
2834 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2835 IEEE80211_FCTL_TODS
);
2837 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2838 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2839 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2840 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2844 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2846 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2847 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2848 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2851 case NL80211_IFTYPE_AP_VLAN
:
2852 if (sdata
->wdev
.use_4addr
) {
2853 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2854 IEEE80211_FCTL_TODS
);
2856 memcpy(hdr
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
2857 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2858 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2859 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2864 case NL80211_IFTYPE_AP
:
2865 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2867 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2868 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2869 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2873 /* not handled on fast-xmit */
2879 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2882 /* We store the key here so there's no point in using rcu_dereference()
2883 * but that's fine because the code that changes the pointers will call
2884 * this function after doing so. For a single CPU that would be enough,
2885 * for multiple see the comment above.
2887 build
.key
= rcu_access_pointer(sta
->ptk
[sta
->ptk_idx
]);
2889 build
.key
= rcu_access_pointer(sdata
->default_unicast_key
);
2891 bool gen_iv
, iv_spc
, mmic
;
2893 gen_iv
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
;
2894 iv_spc
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
;
2895 mmic
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
;
2897 /* don't handle software crypto */
2898 if (!(build
.key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
2901 switch (build
.key
->conf
.cipher
) {
2902 case WLAN_CIPHER_SUITE_CCMP
:
2903 case WLAN_CIPHER_SUITE_CCMP_256
:
2904 /* add fixed key ID */
2906 (build
.hdr
+ build
.hdr_len
)[3] =
2907 0x20 | (build
.key
->conf
.keyidx
<< 6);
2908 build
.pn_offs
= build
.hdr_len
;
2910 if (gen_iv
|| iv_spc
)
2911 build
.hdr_len
+= IEEE80211_CCMP_HDR_LEN
;
2913 case WLAN_CIPHER_SUITE_GCMP
:
2914 case WLAN_CIPHER_SUITE_GCMP_256
:
2915 /* add fixed key ID */
2917 (build
.hdr
+ build
.hdr_len
)[3] =
2918 0x20 | (build
.key
->conf
.keyidx
<< 6);
2919 build
.pn_offs
= build
.hdr_len
;
2921 if (gen_iv
|| iv_spc
)
2922 build
.hdr_len
+= IEEE80211_GCMP_HDR_LEN
;
2924 case WLAN_CIPHER_SUITE_TKIP
:
2925 /* cannot handle MMIC or IV generation in xmit-fast */
2929 build
.hdr_len
+= IEEE80211_TKIP_IV_LEN
;
2931 case WLAN_CIPHER_SUITE_WEP40
:
2932 case WLAN_CIPHER_SUITE_WEP104
:
2933 /* cannot handle IV generation in fast-xmit */
2937 build
.hdr_len
+= IEEE80211_WEP_IV_LEN
;
2939 case WLAN_CIPHER_SUITE_AES_CMAC
:
2940 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
2941 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
2942 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
2944 "management cipher suite 0x%x enabled for data\n",
2945 build
.key
->conf
.cipher
);
2948 /* we don't know how to generate IVs for this at all */
2949 if (WARN_ON(gen_iv
))
2951 /* pure hardware keys are OK, of course */
2952 if (!(build
.key
->flags
& KEY_FLAG_CIPHER_SCHEME
))
2954 /* cipher scheme might require space allocation */
2956 build
.key
->conf
.iv_len
> IEEE80211_FAST_XMIT_MAX_IV
)
2959 build
.hdr_len
+= build
.key
->conf
.iv_len
;
2962 fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
2965 hdr
->frame_control
= fc
;
2967 memcpy(build
.hdr
+ build
.hdr_len
,
2968 rfc1042_header
, sizeof(rfc1042_header
));
2969 build
.hdr_len
+= sizeof(rfc1042_header
);
2971 fast_tx
= kmemdup(&build
, sizeof(build
), GFP_ATOMIC
);
2972 /* if the kmemdup fails, continue w/o fast_tx */
2977 /* we might have raced against another call to this function */
2978 old
= rcu_dereference_protected(sta
->fast_tx
,
2979 lockdep_is_held(&sta
->lock
));
2980 rcu_assign_pointer(sta
->fast_tx
, fast_tx
);
2982 kfree_rcu(old
, rcu_head
);
2983 spin_unlock_bh(&sta
->lock
);
2986 void ieee80211_check_fast_xmit_all(struct ieee80211_local
*local
)
2988 struct sta_info
*sta
;
2991 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
2992 ieee80211_check_fast_xmit(sta
);
2996 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data
*sdata
)
2998 struct ieee80211_local
*local
= sdata
->local
;
2999 struct sta_info
*sta
;
3003 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
3004 if (sdata
!= sta
->sdata
&&
3005 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
3007 ieee80211_check_fast_xmit(sta
);
3013 void ieee80211_clear_fast_xmit(struct sta_info
*sta
)
3015 struct ieee80211_fast_tx
*fast_tx
;
3017 spin_lock_bh(&sta
->lock
);
3018 fast_tx
= rcu_dereference_protected(sta
->fast_tx
,
3019 lockdep_is_held(&sta
->lock
));
3020 RCU_INIT_POINTER(sta
->fast_tx
, NULL
);
3021 spin_unlock_bh(&sta
->lock
);
3024 kfree_rcu(fast_tx
, rcu_head
);
3027 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local
*local
,
3028 struct sk_buff
*skb
, int headroom
,
3031 int amsdu_len
= *subframe_len
+ sizeof(struct ethhdr
);
3032 int padding
= (4 - amsdu_len
) & 3;
3034 if (skb_headroom(skb
) < headroom
|| skb_tailroom(skb
) < padding
) {
3035 I802_DEBUG_INC(local
->tx_expand_skb_head
);
3037 if (pskb_expand_head(skb
, headroom
, padding
, GFP_ATOMIC
)) {
3038 wiphy_debug(local
->hw
.wiphy
,
3039 "failed to reallocate TX buffer\n");
3045 *subframe_len
+= padding
;
3046 memset(skb_put(skb
, padding
), 0, padding
);
3052 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data
*sdata
,
3053 struct ieee80211_fast_tx
*fast_tx
,
3054 struct sk_buff
*skb
)
3056 struct ieee80211_local
*local
= sdata
->local
;
3057 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3058 struct ieee80211_hdr
*hdr
;
3059 struct ethhdr
*amsdu_hdr
;
3060 int hdr_len
= fast_tx
->hdr_len
- sizeof(rfc1042_header
);
3061 int subframe_len
= skb
->len
- hdr_len
;
3063 u8
*qc
, *h_80211_src
, *h_80211_dst
;
3066 if (info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
)
3069 if (info
->control
.flags
& IEEE80211_TX_CTRL_AMSDU
)
3072 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(*amsdu_hdr
),
3076 data
= skb_push(skb
, sizeof(*amsdu_hdr
));
3077 memmove(data
, data
+ sizeof(*amsdu_hdr
), hdr_len
);
3079 amsdu_hdr
= data
+ hdr_len
;
3080 /* h_80211_src/dst is addr* field within hdr */
3081 h_80211_src
= data
+ fast_tx
->sa_offs
;
3082 h_80211_dst
= data
+ fast_tx
->da_offs
;
3084 amsdu_hdr
->h_proto
= cpu_to_be16(subframe_len
);
3085 ether_addr_copy(amsdu_hdr
->h_source
, h_80211_src
);
3086 ether_addr_copy(amsdu_hdr
->h_dest
, h_80211_dst
);
3088 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3089 * fields needs to be changed to BSSID for A-MSDU frames depending
3090 * on FromDS/ToDS values.
3092 switch (sdata
->vif
.type
) {
3093 case NL80211_IFTYPE_STATION
:
3094 bssid
= sdata
->u
.mgd
.bssid
;
3096 case NL80211_IFTYPE_AP
:
3097 case NL80211_IFTYPE_AP_VLAN
:
3098 bssid
= sdata
->vif
.addr
;
3104 if (bssid
&& ieee80211_has_fromds(hdr
->frame_control
))
3105 ether_addr_copy(h_80211_src
, bssid
);
3107 if (bssid
&& ieee80211_has_tods(hdr
->frame_control
))
3108 ether_addr_copy(h_80211_dst
, bssid
);
3110 qc
= ieee80211_get_qos_ctl(hdr
);
3111 *qc
|= IEEE80211_QOS_CTL_A_MSDU_PRESENT
;
3113 info
->control
.flags
|= IEEE80211_TX_CTRL_AMSDU
;
3118 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data
*sdata
,
3119 struct sta_info
*sta
,
3120 struct ieee80211_fast_tx
*fast_tx
,
3121 struct sk_buff
*skb
)
3123 struct ieee80211_local
*local
= sdata
->local
;
3124 struct fq
*fq
= &local
->fq
;
3126 struct fq_flow
*flow
;
3127 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3128 struct ieee80211_txq
*txq
= sta
->sta
.txq
[tid
];
3129 struct txq_info
*txqi
;
3130 struct sk_buff
**frag_tail
, *head
;
3131 int subframe_len
= skb
->len
- ETH_ALEN
;
3132 u8 max_subframes
= sta
->sta
.max_amsdu_subframes
;
3133 int max_frags
= local
->hw
.max_tx_fragments
;
3134 int max_amsdu_len
= sta
->sta
.max_amsdu_len
;
3138 unsigned int orig_len
;
3141 if (!ieee80211_hw_check(&local
->hw
, TX_AMSDU
))
3147 txqi
= to_txq_info(txq
);
3148 if (test_bit(IEEE80211_TXQ_NO_AMSDU
, &txqi
->flags
))
3151 if (sta
->sta
.max_rc_amsdu_len
)
3152 max_amsdu_len
= min_t(int, max_amsdu_len
,
3153 sta
->sta
.max_rc_amsdu_len
);
3155 spin_lock_bh(&fq
->lock
);
3157 /* TODO: Ideally aggregation should be done on dequeue to remain
3158 * responsive to environment changes.
3162 flow
= fq_flow_classify(fq
, tin
, skb
, fq_flow_get_default_func
);
3163 head
= skb_peek_tail(&flow
->queue
);
3167 orig_len
= head
->len
;
3169 if (skb
->len
+ head
->len
> max_amsdu_len
)
3172 if (!ieee80211_amsdu_prepare_head(sdata
, fast_tx
, head
))
3175 nfrags
= 1 + skb_shinfo(skb
)->nr_frags
;
3176 nfrags
+= 1 + skb_shinfo(head
)->nr_frags
;
3177 frag_tail
= &skb_shinfo(head
)->frag_list
;
3178 while (*frag_tail
) {
3179 nfrags
+= 1 + skb_shinfo(*frag_tail
)->nr_frags
;
3180 frag_tail
= &(*frag_tail
)->next
;
3184 if (max_subframes
&& n
> max_subframes
)
3187 if (max_frags
&& nfrags
> max_frags
)
3190 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(rfc1042_header
) + 2,
3195 data
= skb_push(skb
, ETH_ALEN
+ 2);
3196 memmove(data
, data
+ ETH_ALEN
+ 2, 2 * ETH_ALEN
);
3198 data
+= 2 * ETH_ALEN
;
3199 len
= cpu_to_be16(subframe_len
);
3200 memcpy(data
, &len
, 2);
3201 memcpy(data
+ 2, rfc1042_header
, sizeof(rfc1042_header
));
3203 head
->len
+= skb
->len
;
3204 head
->data_len
+= skb
->len
;
3207 flow
->backlog
+= head
->len
- orig_len
;
3208 tin
->backlog_bytes
+= head
->len
- orig_len
;
3210 fq_recalc_backlog(fq
, tin
, flow
);
3213 spin_unlock_bh(&fq
->lock
);
3219 * Can be called while the sta lock is held. Anything that can cause packets to
3220 * be generated will cause deadlock!
3222 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data
*sdata
,
3223 struct sta_info
*sta
, u8 pn_offs
,
3224 struct ieee80211_key
*key
,
3225 struct sk_buff
*skb
)
3227 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3228 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3229 u8 tid
= IEEE80211_NUM_TIDS
;
3232 info
->control
.hw_key
= &key
->conf
;
3234 ieee80211_tx_stats(skb
->dev
, skb
->len
);
3236 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3237 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3238 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, tid
);
3240 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
3241 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence_number
);
3242 sdata
->sequence_number
+= 0x10;
3245 if (skb_shinfo(skb
)->gso_size
)
3246 sta
->tx_stats
.msdu
[tid
] +=
3247 DIV_ROUND_UP(skb
->len
, skb_shinfo(skb
)->gso_size
);
3249 sta
->tx_stats
.msdu
[tid
]++;
3251 info
->hw_queue
= sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
3253 /* statistics normally done by ieee80211_tx_h_stats (but that
3254 * has to consider fragmentation, so is more complex)
3256 sta
->tx_stats
.bytes
[skb_get_queue_mapping(skb
)] += skb
->len
;
3257 sta
->tx_stats
.packets
[skb_get_queue_mapping(skb
)]++;
3261 u8
*crypto_hdr
= skb
->data
+ pn_offs
;
3263 switch (key
->conf
.cipher
) {
3264 case WLAN_CIPHER_SUITE_CCMP
:
3265 case WLAN_CIPHER_SUITE_CCMP_256
:
3266 case WLAN_CIPHER_SUITE_GCMP
:
3267 case WLAN_CIPHER_SUITE_GCMP_256
:
3268 pn
= atomic64_inc_return(&key
->conf
.tx_pn
);
3270 crypto_hdr
[1] = pn
>> 8;
3271 crypto_hdr
[4] = pn
>> 16;
3272 crypto_hdr
[5] = pn
>> 24;
3273 crypto_hdr
[6] = pn
>> 32;
3274 crypto_hdr
[7] = pn
>> 40;
3280 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data
*sdata
,
3281 struct sta_info
*sta
,
3282 struct ieee80211_fast_tx
*fast_tx
,
3283 struct sk_buff
*skb
)
3285 struct ieee80211_local
*local
= sdata
->local
;
3286 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
3287 int extra_head
= fast_tx
->hdr_len
- (ETH_HLEN
- 2);
3288 int hw_headroom
= sdata
->local
->hw
.extra_tx_headroom
;
3290 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3291 struct ieee80211_hdr
*hdr
= (void *)fast_tx
->hdr
;
3292 struct ieee80211_tx_data tx
;
3293 ieee80211_tx_result r
;
3294 struct tid_ampdu_tx
*tid_tx
= NULL
;
3295 u8 tid
= IEEE80211_NUM_TIDS
;
3297 /* control port protocol needs a lot of special handling */
3298 if (cpu_to_be16(ethertype
) == sdata
->control_port_protocol
)
3301 /* only RFC 1042 SNAP */
3302 if (ethertype
< ETH_P_802_3_MIN
)
3305 /* don't handle TX status request here either */
3306 if (skb
->sk
&& skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)
3309 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3310 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3311 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
3313 if (!test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
))
3315 if (tid_tx
->timeout
)
3316 tid_tx
->last_tx
= jiffies
;
3320 /* after this point (skb is modified) we cannot return false */
3322 if (skb_shared(skb
)) {
3323 struct sk_buff
*tmp_skb
= skb
;
3325 skb
= skb_clone(skb
, GFP_ATOMIC
);
3332 if ((hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) &&
3333 ieee80211_amsdu_aggregate(sdata
, sta
, fast_tx
, skb
))
3336 /* will not be crypto-handled beyond what we do here, so use false
3337 * as the may-encrypt argument for the resize to not account for
3338 * more room than we already have in 'extra_head'
3340 if (unlikely(ieee80211_skb_resize(sdata
, skb
,
3341 max_t(int, extra_head
+ hw_headroom
-
3342 skb_headroom(skb
), 0),
3348 memcpy(ð
, skb
->data
, ETH_HLEN
- 2);
3349 hdr
= (void *)skb_push(skb
, extra_head
);
3350 memcpy(skb
->data
, fast_tx
->hdr
, fast_tx
->hdr_len
);
3351 memcpy(skb
->data
+ fast_tx
->da_offs
, eth
.h_dest
, ETH_ALEN
);
3352 memcpy(skb
->data
+ fast_tx
->sa_offs
, eth
.h_source
, ETH_ALEN
);
3354 memset(info
, 0, sizeof(*info
));
3355 info
->band
= fast_tx
->band
;
3356 info
->control
.vif
= &sdata
->vif
;
3357 info
->flags
= IEEE80211_TX_CTL_FIRST_FRAGMENT
|
3358 IEEE80211_TX_CTL_DONTFRAG
|
3359 (tid_tx
? IEEE80211_TX_CTL_AMPDU
: 0);
3360 info
->control
.flags
= IEEE80211_TX_CTRL_FAST_XMIT
;
3362 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3363 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3364 *ieee80211_get_qos_ctl(hdr
) = tid
;
3367 __skb_queue_head_init(&tx
.skbs
);
3369 tx
.flags
= IEEE80211_TX_UNICAST
;
3373 tx
.key
= fast_tx
->key
;
3375 if (!ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
3377 r
= ieee80211_tx_h_rate_ctrl(&tx
);
3381 if (r
!= TX_CONTINUE
) {
3388 if (ieee80211_queue_skb(local
, sdata
, sta
, skb
))
3391 ieee80211_xmit_fast_finish(sdata
, sta
, fast_tx
->pn_offs
,
3394 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3395 sdata
= container_of(sdata
->bss
,
3396 struct ieee80211_sub_if_data
, u
.ap
);
3398 __skb_queue_tail(&tx
.skbs
, skb
);
3399 ieee80211_tx_frags(local
, &sdata
->vif
, &sta
->sta
, &tx
.skbs
, false);
3403 struct sk_buff
*ieee80211_tx_dequeue(struct ieee80211_hw
*hw
,
3404 struct ieee80211_txq
*txq
)
3406 struct ieee80211_local
*local
= hw_to_local(hw
);
3407 struct txq_info
*txqi
= container_of(txq
, struct txq_info
, txq
);
3408 struct ieee80211_hdr
*hdr
;
3409 struct sk_buff
*skb
= NULL
;
3410 struct fq
*fq
= &local
->fq
;
3411 struct fq_tin
*tin
= &txqi
->tin
;
3412 struct ieee80211_tx_info
*info
;
3413 struct ieee80211_tx_data tx
;
3414 ieee80211_tx_result r
;
3416 spin_lock_bh(&fq
->lock
);
3418 if (test_bit(IEEE80211_TXQ_STOP
, &txqi
->flags
))
3421 /* Make sure fragments stay together. */
3422 skb
= __skb_dequeue(&txqi
->frags
);
3427 skb
= fq_tin_dequeue(fq
, tin
, fq_tin_dequeue_func
);
3431 ieee80211_set_skb_vif(skb
, txqi
);
3433 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3434 info
= IEEE80211_SKB_CB(skb
);
3436 memset(&tx
, 0, sizeof(tx
));
3437 __skb_queue_head_init(&tx
.skbs
);
3440 tx
.sdata
= vif_to_sdata(info
->control
.vif
);
3443 tx
.sta
= container_of(txq
->sta
, struct sta_info
, sta
);
3446 * The key can be removed while the packet was queued, so need to call
3447 * this here to get the current key.
3449 r
= ieee80211_tx_h_select_key(&tx
);
3450 if (r
!= TX_CONTINUE
) {
3451 ieee80211_free_txskb(&local
->hw
, skb
);
3455 if (test_bit(IEEE80211_TXQ_AMPDU
, &txqi
->flags
))
3456 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
3458 info
->flags
&= ~IEEE80211_TX_CTL_AMPDU
;
3460 if (info
->control
.flags
& IEEE80211_TX_CTRL_FAST_XMIT
) {
3461 struct sta_info
*sta
= container_of(txq
->sta
, struct sta_info
,
3466 (tx
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
))
3467 pn_offs
= ieee80211_hdrlen(hdr
->frame_control
);
3469 ieee80211_xmit_fast_finish(sta
->sdata
, sta
, pn_offs
,
3472 if (invoke_tx_handlers_late(&tx
))
3475 skb
= __skb_dequeue(&tx
.skbs
);
3477 if (!skb_queue_empty(&tx
.skbs
))
3478 skb_queue_splice_tail(&tx
.skbs
, &txqi
->frags
);
3481 if (skb
&& skb_has_frag_list(skb
) &&
3482 !ieee80211_hw_check(&local
->hw
, TX_FRAG_LIST
)) {
3483 if (skb_linearize(skb
)) {
3484 ieee80211_free_txskb(&local
->hw
, skb
);
3490 spin_unlock_bh(&fq
->lock
);
3494 EXPORT_SYMBOL(ieee80211_tx_dequeue
);
3496 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3497 struct net_device
*dev
,
3500 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
3501 struct sta_info
*sta
;
3502 struct sk_buff
*next
;
3504 if (unlikely(skb
->len
< ETH_HLEN
)) {
3511 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
))
3514 if (!IS_ERR_OR_NULL(sta
)) {
3515 struct ieee80211_fast_tx
*fast_tx
;
3517 fast_tx
= rcu_dereference(sta
->fast_tx
);
3520 ieee80211_xmit_fast(sdata
, sta
, fast_tx
, skb
))
3524 if (skb_is_gso(skb
)) {
3525 struct sk_buff
*segs
;
3527 segs
= skb_gso_segment(skb
, 0);
3535 /* we cannot process non-linear frames on this path */
3536 if (skb_linearize(skb
)) {
3541 /* the frame could be fragmented, software-encrypted, and other
3542 * things so we cannot really handle checksum offload with it -
3543 * fix it up in software before we handle anything else.
3545 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3546 skb_set_transport_header(skb
,
3547 skb_checksum_start_offset(skb
));
3548 if (skb_checksum_help(skb
))
3561 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3565 ieee80211_tx_stats(dev
, skb
->len
);
3567 ieee80211_xmit(sdata
, sta
, skb
);
3577 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3578 * @skb: packet to be sent
3579 * @dev: incoming interface
3581 * On failure skb will be freed.
3583 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3584 struct net_device
*dev
)
3586 __ieee80211_subif_start_xmit(skb
, dev
, 0);
3587 return NETDEV_TX_OK
;
3591 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
3592 struct sk_buff
*skb
, u32 info_flags
)
3594 struct ieee80211_hdr
*hdr
;
3595 struct ieee80211_tx_data tx
= {
3596 .local
= sdata
->local
,
3599 struct sta_info
*sta
;
3603 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
)) {
3605 skb
= ERR_PTR(-EINVAL
);
3609 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3613 hdr
= (void *)skb
->data
;
3614 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
3617 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
3620 return ERR_PTR(-EINVAL
);
3629 * ieee80211_clear_tx_pending may not be called in a context where
3630 * it is possible that it packets could come in again.
3632 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
3634 struct sk_buff
*skb
;
3637 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3638 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
3639 ieee80211_free_txskb(&local
->hw
, skb
);
3644 * Returns false if the frame couldn't be transmitted but was queued instead,
3645 * which in this case means re-queued -- take as an indication to stop sending
3646 * more pending frames.
3648 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
3649 struct sk_buff
*skb
)
3651 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3652 struct ieee80211_sub_if_data
*sdata
;
3653 struct sta_info
*sta
;
3654 struct ieee80211_hdr
*hdr
;
3656 struct ieee80211_chanctx_conf
*chanctx_conf
;
3658 sdata
= vif_to_sdata(info
->control
.vif
);
3660 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
3661 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3662 if (unlikely(!chanctx_conf
)) {
3666 info
->band
= chanctx_conf
->def
.chan
->band
;
3667 result
= ieee80211_tx(sdata
, NULL
, skb
, true);
3669 struct sk_buff_head skbs
;
3671 __skb_queue_head_init(&skbs
);
3672 __skb_queue_tail(&skbs
, skb
);
3674 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3675 sta
= sta_info_get(sdata
, hdr
->addr1
);
3677 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
3684 * Transmit all pending packets. Called from tasklet.
3686 void ieee80211_tx_pending(unsigned long data
)
3688 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
3689 unsigned long flags
;
3695 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
3696 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3698 * If queue is stopped by something other than due to pending
3699 * frames, or we have no pending frames, proceed to next queue.
3701 if (local
->queue_stop_reasons
[i
] ||
3702 skb_queue_empty(&local
->pending
[i
]))
3705 while (!skb_queue_empty(&local
->pending
[i
])) {
3706 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
3707 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3709 if (WARN_ON(!info
->control
.vif
)) {
3710 ieee80211_free_txskb(&local
->hw
, skb
);
3714 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
3717 txok
= ieee80211_tx_pending_skb(local
, skb
);
3718 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
3724 if (skb_queue_empty(&local
->pending
[i
]))
3725 ieee80211_propagate_queue_wake(local
, i
);
3727 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
3732 /* functions for drivers to get certain frames */
3734 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3735 struct ps_data
*ps
, struct sk_buff
*skb
,
3740 int i
, have_bits
= 0, n1
, n2
;
3742 /* Generate bitmap for TIM only if there are any STAs in power save
3744 if (atomic_read(&ps
->num_sta_ps
) > 0)
3745 /* in the hope that this is faster than
3746 * checking byte-for-byte */
3747 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
3748 IEEE80211_MAX_AID
+1);
3750 if (ps
->dtim_count
== 0)
3751 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
3756 tim
= pos
= (u8
*) skb_put(skb
, 6);
3757 *pos
++ = WLAN_EID_TIM
;
3759 *pos
++ = ps
->dtim_count
;
3760 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
3762 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
3765 ps
->dtim_bc_mc
= aid0
== 1;
3768 /* Find largest even number N1 so that bits numbered 1 through
3769 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3770 * (N2 + 1) x 8 through 2007 are 0. */
3772 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
3779 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
3786 /* Bitmap control */
3788 /* Part Virt Bitmap */
3789 skb_put(skb
, n2
- n1
);
3790 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
3792 tim
[1] = n2
- n1
+ 4;
3794 *pos
++ = aid0
; /* Bitmap control */
3795 *pos
++ = 0; /* Part Virt Bitmap */
3799 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3800 struct ps_data
*ps
, struct sk_buff
*skb
,
3803 struct ieee80211_local
*local
= sdata
->local
;
3806 * Not very nice, but we want to allow the driver to call
3807 * ieee80211_beacon_get() as a response to the set_tim()
3808 * callback. That, however, is already invoked under the
3809 * sta_lock to guarantee consistent and race-free update
3810 * of the tim bitmap in mac80211 and the driver.
3812 if (local
->tim_in_locked_section
) {
3813 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3815 spin_lock_bh(&local
->tim_lock
);
3816 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3817 spin_unlock_bh(&local
->tim_lock
);
3823 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
3824 struct beacon_data
*beacon
)
3826 struct probe_resp
*resp
;
3828 size_t beacon_data_len
;
3830 u8 count
= beacon
->csa_current_counter
;
3832 switch (sdata
->vif
.type
) {
3833 case NL80211_IFTYPE_AP
:
3834 beacon_data
= beacon
->tail
;
3835 beacon_data_len
= beacon
->tail_len
;
3837 case NL80211_IFTYPE_ADHOC
:
3838 beacon_data
= beacon
->head
;
3839 beacon_data_len
= beacon
->head_len
;
3841 case NL80211_IFTYPE_MESH_POINT
:
3842 beacon_data
= beacon
->head
;
3843 beacon_data_len
= beacon
->head_len
;
3850 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
3851 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
3853 if (beacon
->csa_counter_offsets
[i
]) {
3854 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
3860 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
3863 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
3864 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
3869 static u8
__ieee80211_csa_update_counter(struct beacon_data
*beacon
)
3871 beacon
->csa_current_counter
--;
3873 /* the counter should never reach 0 */
3874 WARN_ON_ONCE(!beacon
->csa_current_counter
);
3876 return beacon
->csa_current_counter
;
3879 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
3881 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3882 struct beacon_data
*beacon
= NULL
;
3887 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3888 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
3889 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
3890 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
3891 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
3892 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
3897 count
= __ieee80211_csa_update_counter(beacon
);
3903 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
3905 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
3907 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3908 struct beacon_data
*beacon
= NULL
;
3910 size_t beacon_data_len
;
3913 if (!ieee80211_sdata_running(sdata
))
3917 if (vif
->type
== NL80211_IFTYPE_AP
) {
3918 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3920 beacon
= rcu_dereference(ap
->beacon
);
3921 if (WARN_ON(!beacon
|| !beacon
->tail
))
3923 beacon_data
= beacon
->tail
;
3924 beacon_data_len
= beacon
->tail_len
;
3925 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
3926 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3928 beacon
= rcu_dereference(ifibss
->presp
);
3932 beacon_data
= beacon
->head
;
3933 beacon_data_len
= beacon
->head_len
;
3934 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
3935 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3937 beacon
= rcu_dereference(ifmsh
->beacon
);
3941 beacon_data
= beacon
->head
;
3942 beacon_data_len
= beacon
->head_len
;
3948 if (!beacon
->csa_counter_offsets
[0])
3951 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
3954 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
3961 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
3963 static struct sk_buff
*
3964 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
3965 struct ieee80211_vif
*vif
,
3966 struct ieee80211_mutable_offsets
*offs
,
3969 struct ieee80211_local
*local
= hw_to_local(hw
);
3970 struct beacon_data
*beacon
= NULL
;
3971 struct sk_buff
*skb
= NULL
;
3972 struct ieee80211_tx_info
*info
;
3973 struct ieee80211_sub_if_data
*sdata
= NULL
;
3974 enum nl80211_band band
;
3975 struct ieee80211_tx_rate_control txrc
;
3976 struct ieee80211_chanctx_conf
*chanctx_conf
;
3977 int csa_off_base
= 0;
3981 sdata
= vif_to_sdata(vif
);
3982 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3984 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
3988 memset(offs
, 0, sizeof(*offs
));
3990 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3991 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3993 beacon
= rcu_dereference(ap
->beacon
);
3995 if (beacon
->csa_counter_offsets
[0]) {
3997 __ieee80211_csa_update_counter(beacon
);
3999 ieee80211_set_csa(sdata
, beacon
);
4003 * headroom, head length,
4004 * tail length and maximum TIM length
4006 skb
= dev_alloc_skb(local
->tx_headroom
+
4008 beacon
->tail_len
+ 256 +
4009 local
->hw
.extra_beacon_tailroom
);
4013 skb_reserve(skb
, local
->tx_headroom
);
4014 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4017 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
4021 offs
->tim_offset
= beacon
->head_len
;
4022 offs
->tim_length
= skb
->len
- beacon
->head_len
;
4024 /* for AP the csa offsets are from tail */
4025 csa_off_base
= skb
->len
;
4029 memcpy(skb_put(skb
, beacon
->tail_len
),
4030 beacon
->tail
, beacon
->tail_len
);
4033 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
4034 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
4035 struct ieee80211_hdr
*hdr
;
4037 beacon
= rcu_dereference(ifibss
->presp
);
4041 if (beacon
->csa_counter_offsets
[0]) {
4043 __ieee80211_csa_update_counter(beacon
);
4045 ieee80211_set_csa(sdata
, beacon
);
4048 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
4049 local
->hw
.extra_beacon_tailroom
);
4052 skb_reserve(skb
, local
->tx_headroom
);
4053 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4056 hdr
= (struct ieee80211_hdr
*) skb
->data
;
4057 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
4058 IEEE80211_STYPE_BEACON
);
4059 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
4060 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
4062 beacon
= rcu_dereference(ifmsh
->beacon
);
4066 if (beacon
->csa_counter_offsets
[0]) {
4068 /* TODO: For mesh csa_counter is in TU, so
4069 * decrementing it by one isn't correct, but
4070 * for now we leave it consistent with overall
4071 * mac80211's behavior.
4073 __ieee80211_csa_update_counter(beacon
);
4075 ieee80211_set_csa(sdata
, beacon
);
4078 if (ifmsh
->sync_ops
)
4079 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
4081 skb
= dev_alloc_skb(local
->tx_headroom
+
4085 local
->hw
.extra_beacon_tailroom
);
4088 skb_reserve(skb
, local
->tx_headroom
);
4089 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
4091 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
4094 offs
->tim_offset
= beacon
->head_len
;
4095 offs
->tim_length
= skb
->len
- beacon
->head_len
;
4098 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
4106 if (offs
&& beacon
) {
4109 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
4110 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
4115 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
4119 band
= chanctx_conf
->def
.chan
->band
;
4121 info
= IEEE80211_SKB_CB(skb
);
4123 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
4124 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
4127 memset(&txrc
, 0, sizeof(txrc
));
4129 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
4130 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
4132 txrc
.reported_rate
.idx
= -1;
4133 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
4134 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
4135 txrc
.max_rate_idx
= -1;
4137 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
4139 rate_control_get_rate(sdata
, NULL
, &txrc
);
4141 info
->control
.vif
= vif
;
4143 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
4144 IEEE80211_TX_CTL_ASSIGN_SEQ
|
4145 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
4153 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
4154 struct ieee80211_vif
*vif
,
4155 struct ieee80211_mutable_offsets
*offs
)
4157 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
4159 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
4161 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
4162 struct ieee80211_vif
*vif
,
4163 u16
*tim_offset
, u16
*tim_length
)
4165 struct ieee80211_mutable_offsets offs
= {};
4166 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
4167 struct sk_buff
*copy
;
4168 struct ieee80211_supported_band
*sband
;
4175 *tim_offset
= offs
.tim_offset
;
4178 *tim_length
= offs
.tim_length
;
4180 if (ieee80211_hw_check(hw
, BEACON_TX_STATUS
) ||
4181 !hw_to_local(hw
)->monitors
)
4184 /* send a copy to monitor interfaces */
4185 copy
= skb_copy(bcn
, GFP_ATOMIC
);
4189 shift
= ieee80211_vif_get_shift(vif
);
4190 sband
= hw
->wiphy
->bands
[ieee80211_get_sdata_band(vif_to_sdata(vif
))];
4191 ieee80211_tx_monitor(hw_to_local(hw
), copy
, sband
, 1, shift
, false);
4195 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
4197 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
4198 struct ieee80211_vif
*vif
)
4200 struct ieee80211_if_ap
*ap
= NULL
;
4201 struct sk_buff
*skb
= NULL
;
4202 struct probe_resp
*presp
= NULL
;
4203 struct ieee80211_hdr
*hdr
;
4204 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
4206 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
4212 presp
= rcu_dereference(ap
->probe_resp
);
4216 skb
= dev_alloc_skb(presp
->len
);
4220 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
4222 hdr
= (struct ieee80211_hdr
*) skb
->data
;
4223 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
4229 EXPORT_SYMBOL(ieee80211_proberesp_get
);
4231 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
4232 struct ieee80211_vif
*vif
)
4234 struct ieee80211_sub_if_data
*sdata
;
4235 struct ieee80211_if_managed
*ifmgd
;
4236 struct ieee80211_pspoll
*pspoll
;
4237 struct ieee80211_local
*local
;
4238 struct sk_buff
*skb
;
4240 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4243 sdata
= vif_to_sdata(vif
);
4244 ifmgd
= &sdata
->u
.mgd
;
4245 local
= sdata
->local
;
4247 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
4251 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4253 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
4254 memset(pspoll
, 0, sizeof(*pspoll
));
4255 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
4256 IEEE80211_STYPE_PSPOLL
);
4257 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
4259 /* aid in PS-Poll has its two MSBs each set to 1 */
4260 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
4262 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
4263 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
4267 EXPORT_SYMBOL(ieee80211_pspoll_get
);
4269 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
4270 struct ieee80211_vif
*vif
)
4272 struct ieee80211_hdr_3addr
*nullfunc
;
4273 struct ieee80211_sub_if_data
*sdata
;
4274 struct ieee80211_if_managed
*ifmgd
;
4275 struct ieee80211_local
*local
;
4276 struct sk_buff
*skb
;
4278 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4281 sdata
= vif_to_sdata(vif
);
4282 ifmgd
= &sdata
->u
.mgd
;
4283 local
= sdata
->local
;
4285 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
4289 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4291 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
4293 memset(nullfunc
, 0, sizeof(*nullfunc
));
4294 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
4295 IEEE80211_STYPE_NULLFUNC
|
4296 IEEE80211_FCTL_TODS
);
4297 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
4298 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
4299 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
4303 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
4305 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
4307 const u8
*ssid
, size_t ssid_len
,
4310 struct ieee80211_local
*local
= hw_to_local(hw
);
4311 struct ieee80211_hdr_3addr
*hdr
;
4312 struct sk_buff
*skb
;
4316 ie_ssid_len
= 2 + ssid_len
;
4318 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
4319 ie_ssid_len
+ tailroom
);
4323 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4325 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
4326 memset(hdr
, 0, sizeof(*hdr
));
4327 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
4328 IEEE80211_STYPE_PROBE_REQ
);
4329 eth_broadcast_addr(hdr
->addr1
);
4330 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
4331 eth_broadcast_addr(hdr
->addr3
);
4333 pos
= skb_put(skb
, ie_ssid_len
);
4334 *pos
++ = WLAN_EID_SSID
;
4337 memcpy(pos
, ssid
, ssid_len
);
4342 EXPORT_SYMBOL(ieee80211_probereq_get
);
4344 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4345 const void *frame
, size_t frame_len
,
4346 const struct ieee80211_tx_info
*frame_txctl
,
4347 struct ieee80211_rts
*rts
)
4349 const struct ieee80211_hdr
*hdr
= frame
;
4351 rts
->frame_control
=
4352 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
4353 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
4355 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
4356 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
4358 EXPORT_SYMBOL(ieee80211_rts_get
);
4360 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4361 const void *frame
, size_t frame_len
,
4362 const struct ieee80211_tx_info
*frame_txctl
,
4363 struct ieee80211_cts
*cts
)
4365 const struct ieee80211_hdr
*hdr
= frame
;
4367 cts
->frame_control
=
4368 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
4369 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
4370 frame_len
, frame_txctl
);
4371 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
4373 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
4376 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
4377 struct ieee80211_vif
*vif
)
4379 struct ieee80211_local
*local
= hw_to_local(hw
);
4380 struct sk_buff
*skb
= NULL
;
4381 struct ieee80211_tx_data tx
;
4382 struct ieee80211_sub_if_data
*sdata
;
4384 struct ieee80211_tx_info
*info
;
4385 struct ieee80211_chanctx_conf
*chanctx_conf
;
4387 sdata
= vif_to_sdata(vif
);
4390 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
4395 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
4396 struct beacon_data
*beacon
=
4397 rcu_dereference(sdata
->u
.ap
.beacon
);
4399 if (!beacon
|| !beacon
->head
)
4402 ps
= &sdata
->u
.ap
.ps
;
4403 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
4404 ps
= &sdata
->u
.mesh
.ps
;
4409 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
4410 goto out
; /* send buffered bc/mc only after DTIM beacon */
4413 skb
= skb_dequeue(&ps
->bc_buf
);
4416 local
->total_ps_buffered
--;
4418 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
4419 struct ieee80211_hdr
*hdr
=
4420 (struct ieee80211_hdr
*) skb
->data
;
4421 /* more buffered multicast/broadcast frames ==> set
4422 * MoreData flag in IEEE 802.11 header to inform PS
4424 hdr
->frame_control
|=
4425 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
4428 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
4429 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
4430 if (!ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
))
4432 ieee80211_free_txskb(hw
, skb
);
4435 info
= IEEE80211_SKB_CB(skb
);
4437 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
4438 info
->band
= chanctx_conf
->def
.chan
->band
;
4440 if (invoke_tx_handlers(&tx
))
4447 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
4449 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4451 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4452 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4453 struct ieee80211_local
*local
= sdata
->local
;
4457 lockdep_assert_held(&local
->sta_mtx
);
4459 /* only some cases are supported right now */
4460 switch (sdata
->vif
.type
) {
4461 case NL80211_IFTYPE_STATION
:
4462 case NL80211_IFTYPE_AP
:
4463 case NL80211_IFTYPE_AP_VLAN
:
4470 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
4473 if (sta
->reserved_tid
== tid
) {
4478 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
4479 sdata_err(sdata
, "TID reservation already active\n");
4484 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
4485 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4489 /* Tear down BA sessions so we stop aggregating on this TID */
4490 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
)) {
4491 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4492 __ieee80211_stop_tx_ba_session(sta
, tid
,
4493 AGG_STOP_LOCAL_REQUEST
);
4496 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
4497 __ieee80211_flush_queues(local
, sdata
, queues
, false);
4499 sta
->reserved_tid
= tid
;
4501 ieee80211_wake_vif_queues(local
, sdata
,
4502 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4504 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
))
4505 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4511 EXPORT_SYMBOL(ieee80211_reserve_tid
);
4513 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4515 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4516 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4518 lockdep_assert_held(&sdata
->local
->sta_mtx
);
4520 /* only some cases are supported right now */
4521 switch (sdata
->vif
.type
) {
4522 case NL80211_IFTYPE_STATION
:
4523 case NL80211_IFTYPE_AP
:
4524 case NL80211_IFTYPE_AP_VLAN
:
4531 if (tid
!= sta
->reserved_tid
) {
4532 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
4536 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
4538 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
4540 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
4541 struct sk_buff
*skb
, int tid
,
4542 enum nl80211_band band
)
4544 int ac
= ieee802_1d_to_ac
[tid
& 7];
4546 skb_reset_mac_header(skb
);
4547 skb_set_queue_mapping(skb
, ac
);
4548 skb
->priority
= tid
;
4550 skb
->dev
= sdata
->dev
;
4553 * The other path calling ieee80211_xmit is from the tasklet,
4554 * and while we can handle concurrent transmissions locking
4555 * requirements are that we do not come into tx with bhs on.
4558 IEEE80211_SKB_CB(skb
)->band
= band
;
4559 ieee80211_xmit(sdata
, NULL
, skb
);