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(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
335 ieee80211_is_data(hdr
->frame_control
) &&
336 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
338 * No associated STAs - no need to send multicast
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
353 int total
= 0, purged
= 0;
355 struct ieee80211_sub_if_data
*sdata
;
356 struct sta_info
*sta
;
358 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
361 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
362 ps
= &sdata
->u
.ap
.ps
;
363 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
364 ps
= &sdata
->u
.mesh
.ps
;
368 skb
= skb_dequeue(&ps
->bc_buf
);
371 ieee80211_free_txskb(&local
->hw
, skb
);
373 total
+= skb_queue_len(&ps
->bc_buf
);
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
380 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
383 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
384 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
385 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
388 ieee80211_free_txskb(&local
->hw
, skb
);
394 local
->total_ps_buffered
= total
;
395 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
401 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
402 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
406 * broadcast/multicast frame
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
415 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
419 ps
= &tx
->sdata
->bss
->ps
;
420 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
421 ps
= &tx
->sdata
->u
.mesh
.ps
;
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr
->frame_control
))
431 if (ieee80211_is_probe_req(hdr
->frame_control
))
434 if (ieee80211_hw_check(&tx
->local
->hw
, QUEUE_CONTROL
))
435 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
437 /* no stations in PS mode */
438 if (!atomic_read(&ps
->num_sta_ps
))
441 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx
->local
->hw
, HOST_BROADCAST_PS_BUFFERING
))
447 /* buffered in mac80211 */
448 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
449 purge_old_ps_buffers(tx
->local
);
451 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx
->local
->hw
, skb_dequeue(&ps
->bc_buf
));
456 tx
->local
->total_ps_buffered
++;
458 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
463 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
466 if (!ieee80211_is_mgmt(fc
))
469 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
472 if (!ieee80211_is_robust_mgmt_frame(skb
))
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
481 struct sta_info
*sta
= tx
->sta
;
482 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
483 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
484 struct ieee80211_local
*local
= tx
->local
;
489 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
490 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
491 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) &&
492 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
493 int ac
= skb_get_queue_mapping(tx
->skb
);
495 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
496 !ieee80211_is_bufferable_mmpdu(hdr
->frame_control
)) {
497 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
501 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
503 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
504 purge_old_ps_buffers(tx
->local
);
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta
->ps_lock
);
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
513 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
514 !test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) &&
515 !test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) {
516 spin_unlock(&sta
->ps_lock
);
520 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
521 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 ieee80211_free_txskb(&local
->hw
, old
);
527 tx
->local
->total_ps_buffered
++;
529 info
->control
.jiffies
= jiffies
;
530 info
->control
.vif
= &tx
->sdata
->vif
;
531 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
532 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
533 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
534 spin_unlock(&sta
->ps_lock
);
536 if (!timer_pending(&local
->sta_cleanup
))
537 mod_timer(&local
->sta_cleanup
,
538 round_jiffies(jiffies
+
539 STA_INFO_CLEANUP_INTERVAL
));
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
545 sta_info_recalc_tim(sta
);
548 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
560 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
563 if (tx
->flags
& IEEE80211_TX_UNICAST
)
564 return ieee80211_tx_h_unicast_ps_buf(tx
);
566 return ieee80211_tx_h_multicast_ps_buf(tx
);
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
572 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
574 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
575 if (tx
->sdata
->control_port_no_encrypt
)
576 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
577 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
578 info
->flags
|= IEEE80211_TX_CTL_USE_MINRATE
;
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
587 struct ieee80211_key
*key
;
588 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
589 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
591 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
594 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
596 else if (ieee80211_is_group_privacy_action(tx
->skb
) &&
597 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
599 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
600 is_multicast_ether_addr(hdr
->addr1
) &&
601 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
602 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
604 else if (is_multicast_ether_addr(hdr
->addr1
) &&
605 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
607 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
608 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
614 bool skip_hw
= false;
616 /* TODO: add threshold stuff again */
618 switch (tx
->key
->conf
.cipher
) {
619 case WLAN_CIPHER_SUITE_WEP40
:
620 case WLAN_CIPHER_SUITE_WEP104
:
621 case WLAN_CIPHER_SUITE_TKIP
:
622 if (!ieee80211_is_data_present(hdr
->frame_control
))
625 case WLAN_CIPHER_SUITE_CCMP
:
626 case WLAN_CIPHER_SUITE_CCMP_256
:
627 case WLAN_CIPHER_SUITE_GCMP
:
628 case WLAN_CIPHER_SUITE_GCMP_256
:
629 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
630 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
632 !ieee80211_is_group_privacy_action(tx
->skb
))
635 skip_hw
= (tx
->key
->conf
.flags
&
636 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
637 ieee80211_is_mgmt(hdr
->frame_control
);
639 case WLAN_CIPHER_SUITE_AES_CMAC
:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
643 if (!ieee80211_is_mgmt(hdr
->frame_control
))
648 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
649 !ieee80211_is_deauth(hdr
->frame_control
)))
652 if (!skip_hw
&& tx
->key
&&
653 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
654 info
->control
.hw_key
= &tx
->key
->conf
;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
663 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
664 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
665 struct ieee80211_supported_band
*sband
;
667 struct ieee80211_tx_rate_control txrc
;
668 struct ieee80211_sta_rates
*ratetbl
= NULL
;
671 memset(&txrc
, 0, sizeof(txrc
));
673 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
675 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
676 tx
->local
->hw
.wiphy
->frag_threshold
);
678 /* set up the tx rate control struct we give the RC algo */
679 txrc
.hw
= &tx
->local
->hw
;
681 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
683 txrc
.reported_rate
.idx
= -1;
684 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
685 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
686 txrc
.max_rate_idx
= -1;
688 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
690 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
691 txrc
.rate_idx_mcs_mask
=
692 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
694 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
695 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
696 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
697 tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
);
699 /* set up RTS protection if desired */
700 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
704 info
->control
.use_rts
= txrc
.rts
;
705 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
708 * Use short preamble if the BSS can handle it, but not for
709 * management frames unless we know the receiver can handle
710 * that -- the management frame might be to a station that
711 * just wants a probe response.
713 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
714 (ieee80211_is_data(hdr
->frame_control
) ||
715 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
716 txrc
.short_preamble
= true;
718 info
->control
.short_preamble
= txrc
.short_preamble
;
720 /* don't ask rate control when rate already injected via radiotap */
721 if (info
->control
.flags
& IEEE80211_TX_CTRL_RATE_INJECT
)
725 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
728 * Lets not bother rate control if we're associated and cannot
729 * talk to the sta. This should not happen.
731 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
732 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
733 "%s: Dropped data frame as no usable bitrate found while "
734 "scanning and associated. Target station: "
735 "%pM on %d GHz band\n",
736 tx
->sdata
->name
, hdr
->addr1
,
741 * If we're associated with the sta at this point we know we can at
742 * least send the frame at the lowest bit rate.
744 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
746 if (tx
->sta
&& !info
->control
.skip_table
)
747 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
749 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
751 struct ieee80211_tx_rate rate
= {
752 .idx
= ratetbl
->rate
[0].idx
,
753 .flags
= ratetbl
->rate
[0].flags
,
754 .count
= ratetbl
->rate
[0].count
757 if (ratetbl
->rate
[0].idx
< 0)
765 tx
->rate
= info
->control
.rates
[0];
768 if (txrc
.reported_rate
.idx
< 0) {
769 txrc
.reported_rate
= tx
->rate
;
770 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
771 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
773 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
778 if (unlikely(!info
->control
.rates
[0].count
))
779 info
->control
.rates
[0].count
= 1;
781 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
782 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
783 info
->control
.rates
[0].count
= 1;
788 static __le16
ieee80211_tx_next_seq(struct sta_info
*sta
, int tid
)
790 u16
*seq
= &sta
->tid_seq
[tid
];
791 __le16 ret
= cpu_to_le16(*seq
);
793 /* Increase the sequence number. */
794 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
799 static ieee80211_tx_result debug_noinline
800 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
802 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
803 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
808 * Packet injection may want to control the sequence
809 * number, if we have no matching interface then we
810 * neither assign one ourselves nor ask the driver to.
812 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
815 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
818 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
821 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
825 * Anything but QoS data that has a sequence number field
826 * (is long enough) gets a sequence number from the global
827 * counter. QoS data frames with a multicast destination
828 * also use the global counter (802.11-2012 9.3.2.10).
830 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
831 is_multicast_ether_addr(hdr
->addr1
)) {
832 /* driver should assign sequence number */
833 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
834 /* for pure STA mode without beacons, we can do it */
835 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
836 tx
->sdata
->sequence_number
+= 0x10;
838 tx
->sta
->tx_stats
.msdu
[IEEE80211_NUM_TIDS
]++;
843 * This should be true for injected/management frames only, for
844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
845 * above since they are not QoS-data frames.
850 /* include per-STA, per-TID sequence counter */
852 qc
= ieee80211_get_qos_ctl(hdr
);
853 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
854 tx
->sta
->tx_stats
.msdu
[tid
]++;
856 if (!tx
->sta
->sta
.txq
[0])
857 hdr
->seq_ctrl
= ieee80211_tx_next_seq(tx
->sta
, tid
);
862 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
863 struct sk_buff
*skb
, int hdrlen
,
866 struct ieee80211_local
*local
= tx
->local
;
867 struct ieee80211_tx_info
*info
;
869 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
870 int pos
= hdrlen
+ per_fragm
;
871 int rem
= skb
->len
- hdrlen
- per_fragm
;
873 if (WARN_ON(rem
< 0))
876 /* first fragment was already added to queue by caller */
879 int fraglen
= per_fragm
;
884 tmp
= dev_alloc_skb(local
->tx_headroom
+
886 tx
->sdata
->encrypt_headroom
+
887 IEEE80211_ENCRYPT_TAILROOM
);
891 __skb_queue_tail(&tx
->skbs
, tmp
);
894 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
896 /* copy control information */
897 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
899 info
= IEEE80211_SKB_CB(tmp
);
900 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
901 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
904 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
906 skb_copy_queue_mapping(tmp
, skb
);
907 tmp
->priority
= skb
->priority
;
910 /* copy header and data */
911 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
912 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
917 /* adjust first fragment's length */
918 skb_trim(skb
, hdrlen
+ per_fragm
);
922 static ieee80211_tx_result debug_noinline
923 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
925 struct sk_buff
*skb
= tx
->skb
;
926 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
927 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
928 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
932 /* no matter what happens, tx->skb moves to tx->skbs */
933 __skb_queue_tail(&tx
->skbs
, skb
);
936 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
939 if (tx
->local
->ops
->set_frag_threshold
)
943 * Warn when submitting a fragmented A-MPDU frame and drop it.
944 * This scenario is handled in ieee80211_tx_prepare but extra
945 * caution taken here as fragmented ampdu may cause Tx stop.
947 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
950 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
952 /* internal error, why isn't DONTFRAG set? */
953 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
957 * Now fragment the frame. This will allocate all the fragments and
958 * chain them (using skb as the first fragment) to skb->next.
959 * During transmission, we will remove the successfully transmitted
960 * fragments from this list. When the low-level driver rejects one
961 * of the fragments then we will simply pretend to accept the skb
962 * but store it away as pending.
964 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
967 /* update duration/seq/flags of fragments */
970 skb_queue_walk(&tx
->skbs
, skb
) {
971 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
973 hdr
= (void *)skb
->data
;
974 info
= IEEE80211_SKB_CB(skb
);
976 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
977 hdr
->frame_control
|= morefrags
;
979 * No multi-rate retries for fragmented frames, that
980 * would completely throw off the NAV at other STAs.
982 info
->control
.rates
[1].idx
= -1;
983 info
->control
.rates
[2].idx
= -1;
984 info
->control
.rates
[3].idx
= -1;
985 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
986 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
988 hdr
->frame_control
&= ~morefrags
;
990 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
997 static ieee80211_tx_result debug_noinline
998 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
1000 struct sk_buff
*skb
;
1006 skb_queue_walk(&tx
->skbs
, skb
) {
1007 ac
= skb_get_queue_mapping(skb
);
1008 tx
->sta
->tx_stats
.bytes
[ac
] += skb
->len
;
1011 tx
->sta
->tx_stats
.packets
[ac
]++;
1016 static ieee80211_tx_result debug_noinline
1017 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1022 switch (tx
->key
->conf
.cipher
) {
1023 case WLAN_CIPHER_SUITE_WEP40
:
1024 case WLAN_CIPHER_SUITE_WEP104
:
1025 return ieee80211_crypto_wep_encrypt(tx
);
1026 case WLAN_CIPHER_SUITE_TKIP
:
1027 return ieee80211_crypto_tkip_encrypt(tx
);
1028 case WLAN_CIPHER_SUITE_CCMP
:
1029 return ieee80211_crypto_ccmp_encrypt(
1030 tx
, IEEE80211_CCMP_MIC_LEN
);
1031 case WLAN_CIPHER_SUITE_CCMP_256
:
1032 return ieee80211_crypto_ccmp_encrypt(
1033 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1034 case WLAN_CIPHER_SUITE_AES_CMAC
:
1035 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1036 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1037 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1038 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1039 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1040 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1041 case WLAN_CIPHER_SUITE_GCMP
:
1042 case WLAN_CIPHER_SUITE_GCMP_256
:
1043 return ieee80211_crypto_gcmp_encrypt(tx
);
1045 return ieee80211_crypto_hw_encrypt(tx
);
1051 static ieee80211_tx_result debug_noinline
1052 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1054 struct sk_buff
*skb
;
1055 struct ieee80211_hdr
*hdr
;
1059 skb_queue_walk(&tx
->skbs
, skb
) {
1060 hdr
= (void *) skb
->data
;
1061 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1062 break; /* must not overwrite AID */
1063 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1064 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1065 next_len
= next
->len
;
1068 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1071 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1077 /* actual transmit path */
1079 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1080 struct sk_buff
*skb
,
1081 struct ieee80211_tx_info
*info
,
1082 struct tid_ampdu_tx
*tid_tx
,
1085 bool queued
= false;
1086 bool reset_agg_timer
= false;
1087 struct sk_buff
*purge_skb
= NULL
;
1089 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1090 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1091 reset_agg_timer
= true;
1092 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1094 * nothing -- this aggregation session is being started
1095 * but that might still fail with the driver
1097 } else if (!tx
->sta
->sta
.txq
[tid
]) {
1098 spin_lock(&tx
->sta
->lock
);
1100 * Need to re-check now, because we may get here
1102 * 1) in the window during which the setup is actually
1103 * already done, but not marked yet because not all
1104 * packets are spliced over to the driver pending
1105 * queue yet -- if this happened we acquire the lock
1106 * either before or after the splice happens, but
1107 * need to recheck which of these cases happened.
1109 * 2) during session teardown, if the OPERATIONAL bit
1110 * was cleared due to the teardown but the pointer
1111 * hasn't been assigned NULL yet (or we loaded it
1112 * before it was assigned) -- in this case it may
1113 * now be NULL which means we should just let the
1114 * packet pass through because splicing the frames
1115 * back is already done.
1117 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1120 /* do nothing, let packet pass through */
1121 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1122 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1123 reset_agg_timer
= true;
1126 if (info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
) {
1127 clear_sta_flag(tx
->sta
, WLAN_STA_SP
);
1128 ps_dbg(tx
->sta
->sdata
,
1129 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1130 tx
->sta
->sta
.addr
, tx
->sta
->sta
.aid
);
1132 info
->control
.vif
= &tx
->sdata
->vif
;
1133 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1134 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
1135 __skb_queue_tail(&tid_tx
->pending
, skb
);
1136 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1137 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1139 spin_unlock(&tx
->sta
->lock
);
1142 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1145 /* reset session timer */
1146 if (reset_agg_timer
&& tid_tx
->timeout
)
1147 tid_tx
->last_tx
= jiffies
;
1154 * pass %NULL for the station if unknown, a valid pointer if known
1155 * or an ERR_PTR() if the station is known not to exist
1157 static ieee80211_tx_result
1158 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1159 struct ieee80211_tx_data
*tx
,
1160 struct sta_info
*sta
, struct sk_buff
*skb
)
1162 struct ieee80211_local
*local
= sdata
->local
;
1163 struct ieee80211_hdr
*hdr
;
1164 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1168 memset(tx
, 0, sizeof(*tx
));
1172 __skb_queue_head_init(&tx
->skbs
);
1175 * If this flag is set to true anywhere, and we get here,
1176 * we are doing the needed processing, so remove the flag
1179 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1181 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1187 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1188 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1189 if (!tx
->sta
&& sdata
->wdev
.use_4addr
)
1191 } else if (info
->flags
& (IEEE80211_TX_INTFL_NL80211_FRAME_TX
|
1192 IEEE80211_TX_CTL_INJECTED
) ||
1193 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1194 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1196 if (!tx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
))
1197 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1200 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1201 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1202 ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
1203 !ieee80211_hw_check(&local
->hw
, TX_AMPDU_SETUP_IN_HW
)) {
1204 struct tid_ampdu_tx
*tid_tx
;
1206 qc
= ieee80211_get_qos_ctl(hdr
);
1207 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1209 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1213 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1216 if (unlikely(queued
))
1221 if (is_multicast_ether_addr(hdr
->addr1
)) {
1222 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1223 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1225 tx
->flags
|= IEEE80211_TX_UNICAST
;
1227 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1228 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1229 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1230 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1231 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1235 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1236 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
)) {
1237 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1238 ieee80211_check_fast_xmit(tx
->sta
);
1241 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1246 static struct txq_info
*ieee80211_get_txq(struct ieee80211_local
*local
,
1247 struct ieee80211_vif
*vif
,
1248 struct ieee80211_sta
*pubsta
,
1249 struct sk_buff
*skb
)
1251 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1252 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1253 struct ieee80211_txq
*txq
= NULL
;
1255 if ((info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
) ||
1256 (info
->control
.flags
& IEEE80211_TX_CTRL_PS_RESPONSE
))
1259 if (!ieee80211_is_data(hdr
->frame_control
))
1263 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TID_MASK
;
1265 txq
= pubsta
->txq
[tid
];
1273 return to_txq_info(txq
);
1276 static void ieee80211_set_skb_enqueue_time(struct sk_buff
*skb
)
1278 IEEE80211_SKB_CB(skb
)->control
.enqueue_time
= codel_get_time();
1281 static void ieee80211_set_skb_vif(struct sk_buff
*skb
, struct txq_info
*txqi
)
1283 IEEE80211_SKB_CB(skb
)->control
.vif
= txqi
->txq
.vif
;
1286 static u32
codel_skb_len_func(const struct sk_buff
*skb
)
1291 static codel_time_t
codel_skb_time_func(const struct sk_buff
*skb
)
1293 const struct ieee80211_tx_info
*info
;
1295 info
= (const struct ieee80211_tx_info
*)skb
->cb
;
1296 return info
->control
.enqueue_time
;
1299 static struct sk_buff
*codel_dequeue_func(struct codel_vars
*cvars
,
1302 struct ieee80211_local
*local
;
1303 struct txq_info
*txqi
;
1305 struct fq_flow
*flow
;
1308 local
= vif_to_sdata(txqi
->txq
.vif
)->local
;
1311 if (cvars
== &txqi
->def_cvars
)
1312 flow
= &txqi
->def_flow
;
1314 flow
= &fq
->flows
[cvars
- local
->cvars
];
1316 return fq_flow_dequeue(fq
, flow
);
1319 static void codel_drop_func(struct sk_buff
*skb
,
1322 struct ieee80211_local
*local
;
1323 struct ieee80211_hw
*hw
;
1324 struct txq_info
*txqi
;
1327 local
= vif_to_sdata(txqi
->txq
.vif
)->local
;
1330 ieee80211_free_txskb(hw
, skb
);
1333 static struct sk_buff
*fq_tin_dequeue_func(struct fq
*fq
,
1335 struct fq_flow
*flow
)
1337 struct ieee80211_local
*local
;
1338 struct txq_info
*txqi
;
1339 struct codel_vars
*cvars
;
1340 struct codel_params
*cparams
;
1341 struct codel_stats
*cstats
;
1343 local
= container_of(fq
, struct ieee80211_local
, fq
);
1344 txqi
= container_of(tin
, struct txq_info
, tin
);
1345 cparams
= &local
->cparams
;
1346 cstats
= &local
->cstats
;
1348 if (flow
== &txqi
->def_flow
)
1349 cvars
= &txqi
->def_cvars
;
1351 cvars
= &local
->cvars
[flow
- fq
->flows
];
1353 return codel_dequeue(txqi
,
1359 codel_skb_time_func
,
1361 codel_dequeue_func
);
1364 static void fq_skb_free_func(struct fq
*fq
,
1366 struct fq_flow
*flow
,
1367 struct sk_buff
*skb
)
1369 struct ieee80211_local
*local
;
1371 local
= container_of(fq
, struct ieee80211_local
, fq
);
1372 ieee80211_free_txskb(&local
->hw
, skb
);
1375 static struct fq_flow
*fq_flow_get_default_func(struct fq
*fq
,
1378 struct sk_buff
*skb
)
1380 struct txq_info
*txqi
;
1382 txqi
= container_of(tin
, struct txq_info
, tin
);
1383 return &txqi
->def_flow
;
1386 static void ieee80211_txq_enqueue(struct ieee80211_local
*local
,
1387 struct txq_info
*txqi
,
1388 struct sk_buff
*skb
)
1390 struct fq
*fq
= &local
->fq
;
1391 struct fq_tin
*tin
= &txqi
->tin
;
1393 ieee80211_set_skb_enqueue_time(skb
);
1394 fq_tin_enqueue(fq
, tin
, skb
,
1396 fq_flow_get_default_func
);
1399 void ieee80211_txq_init(struct ieee80211_sub_if_data
*sdata
,
1400 struct sta_info
*sta
,
1401 struct txq_info
*txqi
, int tid
)
1403 fq_tin_init(&txqi
->tin
);
1404 fq_flow_init(&txqi
->def_flow
);
1405 codel_vars_init(&txqi
->def_cvars
);
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
);
1430 int ieee80211_txq_setup_flows(struct ieee80211_local
*local
)
1432 struct fq
*fq
= &local
->fq
;
1436 if (!local
->ops
->wake_tx_queue
)
1439 ret
= fq_init(fq
, 4096);
1443 codel_params_init(&local
->cparams
);
1444 codel_stats_init(&local
->cstats
);
1445 local
->cparams
.interval
= MS2TIME(100);
1446 local
->cparams
.target
= MS2TIME(20);
1447 local
->cparams
.ecn
= true;
1449 local
->cvars
= kcalloc(fq
->flows_cnt
, sizeof(local
->cvars
[0]),
1451 if (!local
->cvars
) {
1452 spin_lock_bh(&fq
->lock
);
1453 fq_reset(fq
, fq_skb_free_func
);
1454 spin_unlock_bh(&fq
->lock
);
1458 for (i
= 0; i
< fq
->flows_cnt
; i
++)
1459 codel_vars_init(&local
->cvars
[i
]);
1464 void ieee80211_txq_teardown_flows(struct ieee80211_local
*local
)
1466 struct fq
*fq
= &local
->fq
;
1468 if (!local
->ops
->wake_tx_queue
)
1471 kfree(local
->cvars
);
1472 local
->cvars
= NULL
;
1474 spin_lock_bh(&fq
->lock
);
1475 fq_reset(fq
, fq_skb_free_func
);
1476 spin_unlock_bh(&fq
->lock
);
1479 struct sk_buff
*ieee80211_tx_dequeue(struct ieee80211_hw
*hw
,
1480 struct ieee80211_txq
*txq
)
1482 struct ieee80211_local
*local
= hw_to_local(hw
);
1483 struct txq_info
*txqi
= container_of(txq
, struct txq_info
, txq
);
1484 struct ieee80211_hdr
*hdr
;
1485 struct sk_buff
*skb
= NULL
;
1486 struct fq
*fq
= &local
->fq
;
1487 struct fq_tin
*tin
= &txqi
->tin
;
1489 spin_lock_bh(&fq
->lock
);
1491 if (test_bit(IEEE80211_TXQ_STOP
, &txqi
->flags
))
1494 skb
= fq_tin_dequeue(fq
, tin
, fq_tin_dequeue_func
);
1498 ieee80211_set_skb_vif(skb
, txqi
);
1500 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1501 if (txq
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1502 struct sta_info
*sta
= container_of(txq
->sta
, struct sta_info
,
1504 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1506 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, txq
->tid
);
1507 if (test_bit(IEEE80211_TXQ_AMPDU
, &txqi
->flags
))
1508 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1510 info
->flags
&= ~IEEE80211_TX_CTL_AMPDU
;
1514 spin_unlock_bh(&fq
->lock
);
1516 if (skb
&& skb_has_frag_list(skb
) &&
1517 !ieee80211_hw_check(&local
->hw
, TX_FRAG_LIST
))
1522 EXPORT_SYMBOL(ieee80211_tx_dequeue
);
1524 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1525 struct ieee80211_vif
*vif
,
1526 struct ieee80211_sta
*sta
,
1527 struct sk_buff_head
*skbs
,
1530 struct ieee80211_tx_control control
= {};
1531 struct fq
*fq
= &local
->fq
;
1532 struct sk_buff
*skb
, *tmp
;
1533 struct txq_info
*txqi
;
1534 unsigned long flags
;
1536 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1537 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1538 int q
= info
->hw_queue
;
1540 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1541 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1542 __skb_unlink(skb
, skbs
);
1543 ieee80211_free_txskb(&local
->hw
, skb
);
1548 txqi
= ieee80211_get_txq(local
, vif
, sta
, skb
);
1550 info
->control
.vif
= vif
;
1552 __skb_unlink(skb
, skbs
);
1554 spin_lock_bh(&fq
->lock
);
1555 ieee80211_txq_enqueue(local
, txqi
, skb
);
1556 spin_unlock_bh(&fq
->lock
);
1558 drv_wake_tx_queue(local
, txqi
);
1563 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1564 if (local
->queue_stop_reasons
[q
] ||
1565 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1566 if (unlikely(info
->flags
&
1567 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1568 if (local
->queue_stop_reasons
[q
] &
1569 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1571 * Drop off-channel frames if queues
1572 * are stopped for any reason other
1573 * than off-channel operation. Never
1576 spin_unlock_irqrestore(
1577 &local
->queue_stop_reason_lock
,
1579 ieee80211_purge_tx_queue(&local
->hw
,
1586 * Since queue is stopped, queue up frames for
1587 * later transmission from the tx-pending
1588 * tasklet when the queue is woken again.
1591 skb_queue_splice_init(skbs
,
1592 &local
->pending
[q
]);
1594 skb_queue_splice_tail_init(skbs
,
1595 &local
->pending
[q
]);
1597 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1602 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1604 info
->control
.vif
= vif
;
1607 __skb_unlink(skb
, skbs
);
1608 drv_tx(local
, &control
, skb
);
1615 * Returns false if the frame couldn't be transmitted but was queued instead.
1617 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1618 struct sk_buff_head
*skbs
, int led_len
,
1619 struct sta_info
*sta
, bool txpending
)
1621 struct ieee80211_tx_info
*info
;
1622 struct ieee80211_sub_if_data
*sdata
;
1623 struct ieee80211_vif
*vif
;
1624 struct ieee80211_sta
*pubsta
;
1625 struct sk_buff
*skb
;
1629 if (WARN_ON(skb_queue_empty(skbs
)))
1632 skb
= skb_peek(skbs
);
1633 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1634 info
= IEEE80211_SKB_CB(skb
);
1635 sdata
= vif_to_sdata(info
->control
.vif
);
1636 if (sta
&& !sta
->uploaded
)
1644 switch (sdata
->vif
.type
) {
1645 case NL80211_IFTYPE_MONITOR
:
1646 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1650 sdata
= rcu_dereference(local
->monitor_sdata
);
1654 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1655 } else if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
)) {
1656 ieee80211_purge_tx_queue(&local
->hw
, skbs
);
1661 case NL80211_IFTYPE_AP_VLAN
:
1662 sdata
= container_of(sdata
->bss
,
1663 struct ieee80211_sub_if_data
, u
.ap
);
1670 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1673 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1675 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1681 * Invoke TX handlers, return 0 on success and non-zero if the
1682 * frame was dropped or queued.
1684 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1686 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1687 ieee80211_tx_result res
= TX_DROP
;
1689 #define CALL_TXH(txh) \
1692 if (res != TX_CONTINUE) \
1696 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1697 CALL_TXH(ieee80211_tx_h_check_assoc
);
1698 CALL_TXH(ieee80211_tx_h_ps_buf
);
1699 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1700 CALL_TXH(ieee80211_tx_h_select_key
);
1701 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1702 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1704 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1705 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1710 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1711 CALL_TXH(ieee80211_tx_h_sequence
);
1712 CALL_TXH(ieee80211_tx_h_fragment
);
1713 /* handlers after fragment must be aware of tx info fragmentation! */
1714 CALL_TXH(ieee80211_tx_h_stats
);
1715 CALL_TXH(ieee80211_tx_h_encrypt
);
1716 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1717 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1721 if (unlikely(res
== TX_DROP
)) {
1722 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1724 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1726 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1728 } else if (unlikely(res
== TX_QUEUED
)) {
1729 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1736 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1737 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1738 int band
, struct ieee80211_sta
**sta
)
1740 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1741 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1742 struct ieee80211_tx_data tx
;
1743 struct sk_buff
*skb2
;
1745 if (ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
) == TX_DROP
)
1749 info
->control
.vif
= vif
;
1750 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1752 if (invoke_tx_handlers(&tx
))
1757 *sta
= &tx
.sta
->sta
;
1762 /* this function isn't suitable for fragmented data frames */
1763 skb2
= __skb_dequeue(&tx
.skbs
);
1764 if (WARN_ON(skb2
!= skb
|| !skb_queue_empty(&tx
.skbs
))) {
1765 ieee80211_free_txskb(hw
, skb2
);
1766 ieee80211_purge_tx_queue(hw
, &tx
.skbs
);
1772 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1775 * Returns false if the frame couldn't be transmitted but was queued instead.
1777 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1778 struct sta_info
*sta
, struct sk_buff
*skb
,
1781 struct ieee80211_local
*local
= sdata
->local
;
1782 struct ieee80211_tx_data tx
;
1783 ieee80211_tx_result res_prepare
;
1784 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1788 if (unlikely(skb
->len
< 10)) {
1793 /* initialises tx */
1795 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, sta
, skb
);
1797 if (unlikely(res_prepare
== TX_DROP
)) {
1798 ieee80211_free_txskb(&local
->hw
, skb
);
1800 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1804 /* set up hw_queue value early */
1805 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1806 !ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
1808 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1810 if (!invoke_tx_handlers(&tx
))
1811 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1817 /* device xmit handlers */
1819 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1820 struct sk_buff
*skb
,
1821 int head_need
, bool may_encrypt
)
1823 struct ieee80211_local
*local
= sdata
->local
;
1826 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1827 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1828 tail_need
-= skb_tailroom(skb
);
1829 tail_need
= max_t(int, tail_need
, 0);
1832 if (skb_cloned(skb
) &&
1833 (!ieee80211_hw_check(&local
->hw
, SUPPORTS_CLONED_SKBS
) ||
1834 !skb_clone_writable(skb
, ETH_HLEN
) ||
1835 (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
)))
1836 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1837 else if (head_need
|| tail_need
)
1838 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1842 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1843 wiphy_debug(local
->hw
.wiphy
,
1844 "failed to reallocate TX buffer\n");
1851 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1852 struct sta_info
*sta
, struct sk_buff
*skb
)
1854 struct ieee80211_local
*local
= sdata
->local
;
1855 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1856 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1860 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1862 headroom
= local
->tx_headroom
;
1864 headroom
+= sdata
->encrypt_headroom
;
1865 headroom
-= skb_headroom(skb
);
1866 headroom
= max_t(int, 0, headroom
);
1868 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1869 ieee80211_free_txskb(&local
->hw
, skb
);
1873 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1874 info
->control
.vif
= &sdata
->vif
;
1876 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1877 if (ieee80211_is_data(hdr
->frame_control
) &&
1878 is_unicast_ether_addr(hdr
->addr1
)) {
1879 if (mesh_nexthop_resolve(sdata
, skb
))
1880 return; /* skb queued: don't free */
1882 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1886 ieee80211_set_qos_hdr(sdata
, skb
);
1887 ieee80211_tx(sdata
, sta
, skb
, false);
1890 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local
*local
,
1891 struct sk_buff
*skb
)
1893 struct ieee80211_radiotap_iterator iterator
;
1894 struct ieee80211_radiotap_header
*rthdr
=
1895 (struct ieee80211_radiotap_header
*) skb
->data
;
1896 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1897 struct ieee80211_supported_band
*sband
=
1898 local
->hw
.wiphy
->bands
[info
->band
];
1899 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1903 bool rate_found
= false;
1904 u8 rate_retries
= 0;
1906 u8 mcs_known
, mcs_flags
, mcs_bw
;
1908 u8 vht_mcs
= 0, vht_nss
= 0;
1911 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1912 IEEE80211_TX_CTL_DONTFRAG
;
1915 * for every radiotap entry that is present
1916 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1917 * entries present, or -EINVAL on error)
1921 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1926 /* see if this argument is something we can use */
1927 switch (iterator
.this_arg_index
) {
1929 * You must take care when dereferencing iterator.this_arg
1930 * for multibyte types... the pointer is not aligned. Use
1931 * get_unaligned((type *)iterator.this_arg) to dereference
1932 * iterator.this_arg for type "type" safely on all arches.
1934 case IEEE80211_RADIOTAP_FLAGS
:
1935 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1937 * this indicates that the skb we have been
1938 * handed has the 32-bit FCS CRC at the end...
1939 * we should react to that by snipping it off
1940 * because it will be recomputed and added
1943 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1946 skb_trim(skb
, skb
->len
- FCS_LEN
);
1948 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1949 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1950 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1951 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1954 case IEEE80211_RADIOTAP_TX_FLAGS
:
1955 txflags
= get_unaligned_le16(iterator
.this_arg
);
1956 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1957 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1960 case IEEE80211_RADIOTAP_RATE
:
1961 rate
= *iterator
.this_arg
;
1966 case IEEE80211_RADIOTAP_DATA_RETRIES
:
1967 rate_retries
= *iterator
.this_arg
;
1970 case IEEE80211_RADIOTAP_MCS
:
1971 mcs_known
= iterator
.this_arg
[0];
1972 mcs_flags
= iterator
.this_arg
[1];
1973 if (!(mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_MCS
))
1977 rate
= iterator
.this_arg
[2];
1978 rate_flags
= IEEE80211_TX_RC_MCS
;
1980 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_GI
&&
1981 mcs_flags
& IEEE80211_RADIOTAP_MCS_SGI
)
1982 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
1984 mcs_bw
= mcs_flags
& IEEE80211_RADIOTAP_MCS_BW_MASK
;
1985 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_BW
&&
1986 mcs_bw
== IEEE80211_RADIOTAP_MCS_BW_40
)
1987 rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
1990 case IEEE80211_RADIOTAP_VHT
:
1991 vht_known
= get_unaligned_le16(iterator
.this_arg
);
1994 rate_flags
= IEEE80211_TX_RC_VHT_MCS
;
1995 if ((vht_known
& IEEE80211_RADIOTAP_VHT_KNOWN_GI
) &&
1996 (iterator
.this_arg
[2] &
1997 IEEE80211_RADIOTAP_VHT_FLAG_SGI
))
1998 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
2000 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
) {
2001 if (iterator
.this_arg
[3] == 1)
2003 IEEE80211_TX_RC_40_MHZ_WIDTH
;
2004 else if (iterator
.this_arg
[3] == 4)
2006 IEEE80211_TX_RC_80_MHZ_WIDTH
;
2007 else if (iterator
.this_arg
[3] == 11)
2009 IEEE80211_TX_RC_160_MHZ_WIDTH
;
2012 vht_mcs
= iterator
.this_arg
[4] >> 4;
2013 vht_nss
= iterator
.this_arg
[4] & 0xF;
2017 * Please update the file
2018 * Documentation/networking/mac80211-injection.txt
2019 * when parsing new fields here.
2027 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
2031 info
->control
.flags
|= IEEE80211_TX_CTRL_RATE_INJECT
;
2033 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
2034 info
->control
.rates
[i
].idx
= -1;
2035 info
->control
.rates
[i
].flags
= 0;
2036 info
->control
.rates
[i
].count
= 0;
2039 if (rate_flags
& IEEE80211_TX_RC_MCS
) {
2040 info
->control
.rates
[0].idx
= rate
;
2041 } else if (rate_flags
& IEEE80211_TX_RC_VHT_MCS
) {
2042 ieee80211_rate_set_vht(info
->control
.rates
, vht_mcs
,
2045 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
2046 if (rate
* 5 != sband
->bitrates
[i
].bitrate
)
2049 info
->control
.rates
[0].idx
= i
;
2054 if (info
->control
.rates
[0].idx
< 0)
2055 info
->control
.flags
&= ~IEEE80211_TX_CTRL_RATE_INJECT
;
2057 info
->control
.rates
[0].flags
= rate_flags
;
2058 info
->control
.rates
[0].count
= min_t(u8
, rate_retries
+ 1,
2059 local
->hw
.max_rate_tries
);
2063 * remove the radiotap header
2064 * iterator->_max_length was sanity-checked against
2065 * skb->len by iterator init
2067 skb_pull(skb
, iterator
._max_length
);
2072 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
2073 struct net_device
*dev
)
2075 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2076 struct ieee80211_chanctx_conf
*chanctx_conf
;
2077 struct ieee80211_radiotap_header
*prthdr
=
2078 (struct ieee80211_radiotap_header
*)skb
->data
;
2079 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2080 struct ieee80211_hdr
*hdr
;
2081 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
2082 struct cfg80211_chan_def
*chandef
;
2086 /* check for not even having the fixed radiotap header part */
2087 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
2088 goto fail
; /* too short to be possibly valid */
2090 /* is it a header version we can trust to find length from? */
2091 if (unlikely(prthdr
->it_version
))
2092 goto fail
; /* only version 0 is supported */
2094 /* then there must be a radiotap header with a length we can use */
2095 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
2097 /* does the skb contain enough to deliver on the alleged length? */
2098 if (unlikely(skb
->len
< len_rthdr
))
2099 goto fail
; /* skb too short for claimed rt header extent */
2102 * fix up the pointers accounting for the radiotap
2103 * header still being in there. We are being given
2104 * a precooked IEEE80211 header so no need for
2107 skb_set_mac_header(skb
, len_rthdr
);
2109 * these are just fixed to the end of the rt area since we
2110 * don't have any better information and at this point, nobody cares
2112 skb_set_network_header(skb
, len_rthdr
);
2113 skb_set_transport_header(skb
, len_rthdr
);
2115 if (skb
->len
< len_rthdr
+ 2)
2118 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
2119 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2121 if (skb
->len
< len_rthdr
+ hdrlen
)
2125 * Initialize skb->protocol if the injected frame is a data frame
2126 * carrying a rfc1042 header
2128 if (ieee80211_is_data(hdr
->frame_control
) &&
2129 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
2130 u8
*payload
= (u8
*)hdr
+ hdrlen
;
2132 if (ether_addr_equal(payload
, rfc1042_header
))
2133 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
2137 memset(info
, 0, sizeof(*info
));
2139 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
2140 IEEE80211_TX_CTL_INJECTED
;
2145 * We process outgoing injected frames that have a local address
2146 * we handle as though they are non-injected frames.
2147 * This code here isn't entirely correct, the local MAC address
2148 * isn't always enough to find the interface to use; for proper
2149 * VLAN/WDS support we will need a different mechanism (which
2150 * likely isn't going to be monitor interfaces).
2152 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2154 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
2155 if (!ieee80211_sdata_running(tmp_sdata
))
2157 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2158 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
2159 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
2161 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
2167 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2168 if (!chanctx_conf
) {
2169 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
2172 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
2176 chandef
= &chanctx_conf
->def
;
2177 else if (!local
->use_chanctx
)
2178 chandef
= &local
->_oper_chandef
;
2183 * Frame injection is not allowed if beaconing is not allowed
2184 * or if we need radar detection. Beaconing is usually not allowed when
2185 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2186 * Passive scan is also used in world regulatory domains where
2187 * your country is not known and as such it should be treated as
2188 * NO TX unless the channel is explicitly allowed in which case
2189 * your current regulatory domain would not have the passive scan
2192 * Since AP mode uses monitor interfaces to inject/TX management
2193 * frames we can make AP mode the exception to this rule once it
2194 * supports radar detection as its implementation can deal with
2195 * radar detection by itself. We can do that later by adding a
2196 * monitor flag interfaces used for AP support.
2198 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
2202 info
->band
= chandef
->chan
->band
;
2204 /* process and remove the injection radiotap header */
2205 if (!ieee80211_parse_tx_radiotap(local
, skb
))
2208 ieee80211_xmit(sdata
, NULL
, skb
);
2211 return NETDEV_TX_OK
;
2217 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
2220 static inline bool ieee80211_is_tdls_setup(struct sk_buff
*skb
)
2222 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2224 return ethertype
== ETH_P_TDLS
&&
2226 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
2229 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data
*sdata
,
2230 struct sk_buff
*skb
,
2231 struct sta_info
**sta_out
)
2233 struct sta_info
*sta
;
2235 switch (sdata
->vif
.type
) {
2236 case NL80211_IFTYPE_AP_VLAN
:
2237 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
2241 } else if (sdata
->wdev
.use_4addr
) {
2245 case NL80211_IFTYPE_AP
:
2246 case NL80211_IFTYPE_OCB
:
2247 case NL80211_IFTYPE_ADHOC
:
2248 if (is_multicast_ether_addr(skb
->data
)) {
2249 *sta_out
= ERR_PTR(-ENOENT
);
2252 sta
= sta_info_get_bss(sdata
, skb
->data
);
2254 case NL80211_IFTYPE_WDS
:
2255 sta
= sta_info_get(sdata
, sdata
->u
.wds
.remote_addr
);
2257 #ifdef CONFIG_MAC80211_MESH
2258 case NL80211_IFTYPE_MESH_POINT
:
2259 /* determined much later */
2263 case NL80211_IFTYPE_STATION
:
2264 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
2265 sta
= sta_info_get(sdata
, skb
->data
);
2267 bool tdls_peer
, tdls_auth
;
2269 tdls_peer
= test_sta_flag(sta
,
2270 WLAN_STA_TDLS_PEER
);
2271 tdls_auth
= test_sta_flag(sta
,
2272 WLAN_STA_TDLS_PEER_AUTH
);
2274 if (tdls_peer
&& tdls_auth
) {
2280 * TDLS link during setup - throw out frames to
2281 * peer. Allow TDLS-setup frames to unauthorized
2282 * peers for the special case of a link teardown
2283 * after a TDLS sta is removed due to being
2286 if (tdls_peer
&& !tdls_auth
&&
2287 !ieee80211_is_tdls_setup(skb
))
2293 sta
= sta_info_get(sdata
, sdata
->u
.mgd
.bssid
);
2301 *sta_out
= sta
?: ERR_PTR(-ENOENT
);
2306 * ieee80211_build_hdr - build 802.11 header in the given frame
2307 * @sdata: virtual interface to build the header for
2308 * @skb: the skb to build the header in
2309 * @info_flags: skb flags to set
2311 * This function takes the skb with 802.3 header and reformats the header to
2312 * the appropriate IEEE 802.11 header based on which interface the packet is
2313 * being transmitted on.
2315 * Note that this function also takes care of the TX status request and
2316 * potential unsharing of the SKB - this needs to be interleaved with the
2319 * The function requires the read-side RCU lock held
2321 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2323 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
2324 struct sk_buff
*skb
, u32 info_flags
,
2325 struct sta_info
*sta
)
2327 struct ieee80211_local
*local
= sdata
->local
;
2328 struct ieee80211_tx_info
*info
;
2330 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
2332 struct ieee80211_hdr hdr
;
2333 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
2334 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
2335 const u8
*encaps_data
;
2336 int encaps_len
, skip_header_bytes
;
2338 bool wme_sta
= false, authorized
= false;
2342 struct ieee80211_chanctx_conf
*chanctx_conf
;
2343 struct ieee80211_sub_if_data
*ap_sdata
;
2344 enum nl80211_band band
;
2350 /* convert Ethernet header to proper 802.11 header (based on
2351 * operation mode) */
2352 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2353 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2355 switch (sdata
->vif
.type
) {
2356 case NL80211_IFTYPE_AP_VLAN
:
2357 if (sdata
->wdev
.use_4addr
) {
2358 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2360 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
2361 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2362 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2363 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2365 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2366 wme_sta
= sta
->sta
.wme
;
2368 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2370 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
2371 if (!chanctx_conf
) {
2375 band
= chanctx_conf
->def
.chan
->band
;
2376 if (sdata
->wdev
.use_4addr
)
2379 case NL80211_IFTYPE_AP
:
2380 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2381 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2382 if (!chanctx_conf
) {
2386 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2388 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2389 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2390 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2392 band
= chanctx_conf
->def
.chan
->band
;
2394 case NL80211_IFTYPE_WDS
:
2395 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2397 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
2398 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2399 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2400 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2403 * This is the exception! WDS style interfaces are prohibited
2404 * when channel contexts are in used so this must be valid
2406 band
= local
->hw
.conf
.chandef
.chan
->band
;
2408 #ifdef CONFIG_MAC80211_MESH
2409 case NL80211_IFTYPE_MESH_POINT
:
2410 if (!is_multicast_ether_addr(skb
->data
)) {
2411 struct sta_info
*next_hop
;
2412 bool mpp_lookup
= true;
2414 mpath
= mesh_path_lookup(sdata
, skb
->data
);
2417 next_hop
= rcu_dereference(mpath
->next_hop
);
2419 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
2420 MESH_PATH_RESOLVING
)))
2425 mppath
= mpp_path_lookup(sdata
, skb
->data
);
2427 mppath
->exp_time
= jiffies
;
2430 if (mppath
&& mpath
)
2431 mesh_path_del(sdata
, mpath
->dst
);
2435 * Use address extension if it is a packet from
2436 * another interface or if we know the destination
2437 * is being proxied by a portal (i.e. portal address
2438 * differs from proxied address)
2440 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
2441 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
2442 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2443 skb
->data
, skb
->data
+ ETH_ALEN
);
2444 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
2447 /* DS -> MBSS (802.11-2012 13.11.3.3).
2448 * For unicast with unknown forwarding information,
2449 * destination might be in the MBSS or if that fails
2450 * forwarded to another mesh gate. In either case
2451 * resolution will be handled in ieee80211_xmit(), so
2452 * leave the original DA. This also works for mcast */
2453 const u8
*mesh_da
= skb
->data
;
2456 mesh_da
= mppath
->mpp
;
2458 mesh_da
= mpath
->dst
;
2460 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2461 mesh_da
, sdata
->vif
.addr
);
2462 if (is_multicast_ether_addr(mesh_da
))
2463 /* DA TA mSA AE:SA */
2464 meshhdrlen
= ieee80211_new_mesh_header(
2466 skb
->data
+ ETH_ALEN
, NULL
);
2468 /* RA TA mDA mSA AE:DA SA */
2469 meshhdrlen
= ieee80211_new_mesh_header(
2470 sdata
, &mesh_hdr
, skb
->data
,
2471 skb
->data
+ ETH_ALEN
);
2474 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2475 if (!chanctx_conf
) {
2479 band
= chanctx_conf
->def
.chan
->band
;
2482 case NL80211_IFTYPE_STATION
:
2483 /* we already did checks when looking up the RA STA */
2484 tdls_peer
= test_sta_flag(sta
, WLAN_STA_TDLS_PEER
);
2488 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2489 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2490 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2492 } else if (sdata
->u
.mgd
.use_4addr
&&
2493 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2494 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2495 IEEE80211_FCTL_TODS
);
2497 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2498 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2499 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2500 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2503 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2505 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2506 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2507 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2510 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2511 if (!chanctx_conf
) {
2515 band
= chanctx_conf
->def
.chan
->band
;
2517 case NL80211_IFTYPE_OCB
:
2519 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2520 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2521 eth_broadcast_addr(hdr
.addr3
);
2523 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2524 if (!chanctx_conf
) {
2528 band
= chanctx_conf
->def
.chan
->band
;
2530 case NL80211_IFTYPE_ADHOC
:
2532 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2533 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2534 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2536 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2537 if (!chanctx_conf
) {
2541 band
= chanctx_conf
->def
.chan
->band
;
2548 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2550 /* sta is always NULL for mesh */
2552 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2553 wme_sta
= sta
->sta
.wme
;
2554 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2555 /* For mesh, the use of the QoS header is mandatory */
2559 /* receiver does QoS (which also means we do) use it */
2561 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2566 * Drop unicast frames to unauthorised stations unless they are
2567 * EAPOL frames from the local station.
2569 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2570 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2571 !multicast
&& !authorized
&&
2572 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2573 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2574 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2575 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2576 sdata
->name
, hdr
.addr1
);
2579 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2585 if (unlikely(!multicast
&& skb
->sk
&&
2586 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2587 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2590 unsigned long flags
;
2593 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2594 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2595 1, 0x10000, GFP_ATOMIC
);
2596 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2600 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2608 * If the skb is shared we need to obtain our own copy.
2610 if (skb_shared(skb
)) {
2611 struct sk_buff
*tmp_skb
= skb
;
2613 /* can't happen -- skb is a clone if info_id != 0 */
2616 skb
= skb_clone(skb
, GFP_ATOMIC
);
2625 hdr
.frame_control
= fc
;
2626 hdr
.duration_id
= 0;
2629 skip_header_bytes
= ETH_HLEN
;
2630 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2631 encaps_data
= bridge_tunnel_header
;
2632 encaps_len
= sizeof(bridge_tunnel_header
);
2633 skip_header_bytes
-= 2;
2634 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2635 encaps_data
= rfc1042_header
;
2636 encaps_len
= sizeof(rfc1042_header
);
2637 skip_header_bytes
-= 2;
2643 nh_pos
= skb_network_header(skb
) - skb
->data
;
2644 h_pos
= skb_transport_header(skb
) - skb
->data
;
2646 skb_pull(skb
, skip_header_bytes
);
2647 nh_pos
-= skip_header_bytes
;
2648 h_pos
-= skip_header_bytes
;
2650 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2653 * So we need to modify the skb header and hence need a copy of
2654 * that. The head_need variable above doesn't, so far, include
2655 * the needed header space that we don't need right away. If we
2656 * can, then we don't reallocate right now but only after the
2657 * frame arrives at the master device (if it does...)
2659 * If we cannot, however, then we will reallocate to include all
2660 * the ever needed space. Also, if we need to reallocate it anyway,
2661 * make it big enough for everything we may ever need.
2664 if (head_need
> 0 || skb_cloned(skb
)) {
2665 head_need
+= sdata
->encrypt_headroom
;
2666 head_need
+= local
->tx_headroom
;
2667 head_need
= max_t(int, 0, head_need
);
2668 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2669 ieee80211_free_txskb(&local
->hw
, skb
);
2671 return ERR_PTR(-ENOMEM
);
2676 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2677 nh_pos
+= encaps_len
;
2678 h_pos
+= encaps_len
;
2681 #ifdef CONFIG_MAC80211_MESH
2682 if (meshhdrlen
> 0) {
2683 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2684 nh_pos
+= meshhdrlen
;
2685 h_pos
+= meshhdrlen
;
2689 if (ieee80211_is_data_qos(fc
)) {
2690 __le16
*qos_control
;
2692 qos_control
= (__le16
*) skb_push(skb
, 2);
2693 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2695 * Maybe we could actually set some fields here, for now just
2696 * initialise to zero to indicate no special operation.
2700 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2705 /* Update skb pointers to various headers since this modified frame
2706 * is going to go through Linux networking code that may potentially
2707 * need things like pointer to IP header. */
2708 skb_reset_mac_header(skb
);
2709 skb_set_network_header(skb
, nh_pos
);
2710 skb_set_transport_header(skb
, h_pos
);
2712 info
= IEEE80211_SKB_CB(skb
);
2713 memset(info
, 0, sizeof(*info
));
2715 info
->flags
= info_flags
;
2716 info
->ack_frame_id
= info_id
;
2722 return ERR_PTR(ret
);
2726 * fast-xmit overview
2728 * The core idea of this fast-xmit is to remove per-packet checks by checking
2729 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2730 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2731 * much less work can be done per packet. For example, fragmentation must be
2732 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2735 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2736 * header and other data to aid packet processing in ieee80211_xmit_fast().
2738 * The most difficult part of this is that when any of these assumptions
2739 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2740 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2741 * since the per-packet code no longer checks the conditions. This is reflected
2742 * by the calls to these functions throughout the rest of the code, and must be
2743 * maintained if any of the TX path checks change.
2746 void ieee80211_check_fast_xmit(struct sta_info
*sta
)
2748 struct ieee80211_fast_tx build
= {}, *fast_tx
= NULL
, *old
;
2749 struct ieee80211_local
*local
= sta
->local
;
2750 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
2751 struct ieee80211_hdr
*hdr
= (void *)build
.hdr
;
2752 struct ieee80211_chanctx_conf
*chanctx_conf
;
2755 if (!ieee80211_hw_check(&local
->hw
, SUPPORT_FAST_XMIT
))
2758 /* Locking here protects both the pointer itself, and against concurrent
2759 * invocations winning data access races to, e.g., the key pointer that
2761 * Without it, the invocation of this function right after the key
2762 * pointer changes wouldn't be sufficient, as another CPU could access
2763 * the pointer, then stall, and then do the cache update after the CPU
2764 * that invalidated the key.
2765 * With the locking, such scenarios cannot happen as the check for the
2766 * key and the fast-tx assignment are done atomically, so the CPU that
2767 * modifies the key will either wait or other one will see the key
2768 * cleared/changed already.
2770 spin_lock_bh(&sta
->lock
);
2771 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
2772 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2773 sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2776 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
2779 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
2780 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
2781 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
) ||
2782 test_sta_flag(sta
, WLAN_STA_CLEAR_PS_FILT
))
2785 if (sdata
->noack_map
)
2788 /* fast-xmit doesn't handle fragmentation at all */
2789 if (local
->hw
.wiphy
->frag_threshold
!= (u32
)-1 &&
2790 !local
->ops
->set_frag_threshold
)
2794 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2795 if (!chanctx_conf
) {
2799 build
.band
= chanctx_conf
->def
.chan
->band
;
2802 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2804 switch (sdata
->vif
.type
) {
2805 case NL80211_IFTYPE_ADHOC
:
2807 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2808 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2809 memcpy(hdr
->addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2812 case NL80211_IFTYPE_STATION
:
2813 if (test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2815 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2816 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2817 memcpy(hdr
->addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2822 if (sdata
->u
.mgd
.use_4addr
) {
2823 /* non-regular ethertype cannot use the fastpath */
2824 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2825 IEEE80211_FCTL_TODS
);
2827 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2828 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2829 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2830 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2834 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2836 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2837 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2838 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2841 case NL80211_IFTYPE_AP_VLAN
:
2842 if (sdata
->wdev
.use_4addr
) {
2843 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2844 IEEE80211_FCTL_TODS
);
2846 memcpy(hdr
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
2847 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2848 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2849 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2854 case NL80211_IFTYPE_AP
:
2855 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2857 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2858 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2859 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2863 /* not handled on fast-xmit */
2869 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2872 /* We store the key here so there's no point in using rcu_dereference()
2873 * but that's fine because the code that changes the pointers will call
2874 * this function after doing so. For a single CPU that would be enough,
2875 * for multiple see the comment above.
2877 build
.key
= rcu_access_pointer(sta
->ptk
[sta
->ptk_idx
]);
2879 build
.key
= rcu_access_pointer(sdata
->default_unicast_key
);
2881 bool gen_iv
, iv_spc
, mmic
;
2883 gen_iv
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
;
2884 iv_spc
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
;
2885 mmic
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
;
2887 /* don't handle software crypto */
2888 if (!(build
.key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
2891 switch (build
.key
->conf
.cipher
) {
2892 case WLAN_CIPHER_SUITE_CCMP
:
2893 case WLAN_CIPHER_SUITE_CCMP_256
:
2894 /* add fixed key ID */
2896 (build
.hdr
+ build
.hdr_len
)[3] =
2897 0x20 | (build
.key
->conf
.keyidx
<< 6);
2898 build
.pn_offs
= build
.hdr_len
;
2900 if (gen_iv
|| iv_spc
)
2901 build
.hdr_len
+= IEEE80211_CCMP_HDR_LEN
;
2903 case WLAN_CIPHER_SUITE_GCMP
:
2904 case WLAN_CIPHER_SUITE_GCMP_256
:
2905 /* add fixed key ID */
2907 (build
.hdr
+ build
.hdr_len
)[3] =
2908 0x20 | (build
.key
->conf
.keyidx
<< 6);
2909 build
.pn_offs
= build
.hdr_len
;
2911 if (gen_iv
|| iv_spc
)
2912 build
.hdr_len
+= IEEE80211_GCMP_HDR_LEN
;
2914 case WLAN_CIPHER_SUITE_TKIP
:
2915 /* cannot handle MMIC or IV generation in xmit-fast */
2919 build
.hdr_len
+= IEEE80211_TKIP_IV_LEN
;
2921 case WLAN_CIPHER_SUITE_WEP40
:
2922 case WLAN_CIPHER_SUITE_WEP104
:
2923 /* cannot handle IV generation in fast-xmit */
2927 build
.hdr_len
+= IEEE80211_WEP_IV_LEN
;
2929 case WLAN_CIPHER_SUITE_AES_CMAC
:
2930 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
2931 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
2932 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
2934 "management cipher suite 0x%x enabled for data\n",
2935 build
.key
->conf
.cipher
);
2938 /* we don't know how to generate IVs for this at all */
2939 if (WARN_ON(gen_iv
))
2941 /* pure hardware keys are OK, of course */
2942 if (!(build
.key
->flags
& KEY_FLAG_CIPHER_SCHEME
))
2944 /* cipher scheme might require space allocation */
2946 build
.key
->conf
.iv_len
> IEEE80211_FAST_XMIT_MAX_IV
)
2949 build
.hdr_len
+= build
.key
->conf
.iv_len
;
2952 fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
2955 hdr
->frame_control
= fc
;
2957 memcpy(build
.hdr
+ build
.hdr_len
,
2958 rfc1042_header
, sizeof(rfc1042_header
));
2959 build
.hdr_len
+= sizeof(rfc1042_header
);
2961 fast_tx
= kmemdup(&build
, sizeof(build
), GFP_ATOMIC
);
2962 /* if the kmemdup fails, continue w/o fast_tx */
2967 /* we might have raced against another call to this function */
2968 old
= rcu_dereference_protected(sta
->fast_tx
,
2969 lockdep_is_held(&sta
->lock
));
2970 rcu_assign_pointer(sta
->fast_tx
, fast_tx
);
2972 kfree_rcu(old
, rcu_head
);
2973 spin_unlock_bh(&sta
->lock
);
2976 void ieee80211_check_fast_xmit_all(struct ieee80211_local
*local
)
2978 struct sta_info
*sta
;
2981 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
2982 ieee80211_check_fast_xmit(sta
);
2986 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data
*sdata
)
2988 struct ieee80211_local
*local
= sdata
->local
;
2989 struct sta_info
*sta
;
2993 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
2994 if (sdata
!= sta
->sdata
&&
2995 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
2997 ieee80211_check_fast_xmit(sta
);
3003 void ieee80211_clear_fast_xmit(struct sta_info
*sta
)
3005 struct ieee80211_fast_tx
*fast_tx
;
3007 spin_lock_bh(&sta
->lock
);
3008 fast_tx
= rcu_dereference_protected(sta
->fast_tx
,
3009 lockdep_is_held(&sta
->lock
));
3010 RCU_INIT_POINTER(sta
->fast_tx
, NULL
);
3011 spin_unlock_bh(&sta
->lock
);
3014 kfree_rcu(fast_tx
, rcu_head
);
3017 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local
*local
,
3018 struct sk_buff
*skb
, int headroom
,
3021 int amsdu_len
= *subframe_len
+ sizeof(struct ethhdr
);
3022 int padding
= (4 - amsdu_len
) & 3;
3024 if (skb_headroom(skb
) < headroom
|| skb_tailroom(skb
) < padding
) {
3025 I802_DEBUG_INC(local
->tx_expand_skb_head
);
3027 if (pskb_expand_head(skb
, headroom
, padding
, GFP_ATOMIC
)) {
3028 wiphy_debug(local
->hw
.wiphy
,
3029 "failed to reallocate TX buffer\n");
3035 *subframe_len
+= padding
;
3036 memset(skb_put(skb
, padding
), 0, padding
);
3042 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data
*sdata
,
3043 struct ieee80211_fast_tx
*fast_tx
,
3044 struct sk_buff
*skb
)
3046 struct ieee80211_local
*local
= sdata
->local
;
3047 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3048 struct ieee80211_hdr
*hdr
;
3049 struct ethhdr amsdu_hdr
;
3050 int hdr_len
= fast_tx
->hdr_len
- sizeof(rfc1042_header
);
3051 int subframe_len
= skb
->len
- hdr_len
;
3055 if (info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
)
3058 if (info
->control
.flags
& IEEE80211_TX_CTRL_AMSDU
)
3061 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(amsdu_hdr
),
3065 amsdu_hdr
.h_proto
= cpu_to_be16(subframe_len
);
3066 memcpy(amsdu_hdr
.h_source
, skb
->data
+ fast_tx
->sa_offs
, ETH_ALEN
);
3067 memcpy(amsdu_hdr
.h_dest
, skb
->data
+ fast_tx
->da_offs
, ETH_ALEN
);
3069 data
= skb_push(skb
, sizeof(amsdu_hdr
));
3070 memmove(data
, data
+ sizeof(amsdu_hdr
), hdr_len
);
3071 memcpy(data
+ hdr_len
, &amsdu_hdr
, sizeof(amsdu_hdr
));
3074 qc
= ieee80211_get_qos_ctl(hdr
);
3075 *qc
|= IEEE80211_QOS_CTL_A_MSDU_PRESENT
;
3077 info
->control
.flags
|= IEEE80211_TX_CTRL_AMSDU
;
3082 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data
*sdata
,
3083 struct sta_info
*sta
,
3084 struct ieee80211_fast_tx
*fast_tx
,
3085 struct sk_buff
*skb
)
3087 struct ieee80211_local
*local
= sdata
->local
;
3088 struct fq
*fq
= &local
->fq
;
3090 struct fq_flow
*flow
;
3091 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3092 struct ieee80211_txq
*txq
= sta
->sta
.txq
[tid
];
3093 struct txq_info
*txqi
;
3094 struct sk_buff
**frag_tail
, *head
;
3095 int subframe_len
= skb
->len
- ETH_ALEN
;
3096 u8 max_subframes
= sta
->sta
.max_amsdu_subframes
;
3097 int max_frags
= local
->hw
.max_tx_fragments
;
3098 int max_amsdu_len
= sta
->sta
.max_amsdu_len
;
3102 unsigned int orig_len
;
3105 if (!ieee80211_hw_check(&local
->hw
, TX_AMSDU
))
3111 txqi
= to_txq_info(txq
);
3112 if (test_bit(IEEE80211_TXQ_NO_AMSDU
, &txqi
->flags
))
3115 if (sta
->sta
.max_rc_amsdu_len
)
3116 max_amsdu_len
= min_t(int, max_amsdu_len
,
3117 sta
->sta
.max_rc_amsdu_len
);
3119 spin_lock_bh(&fq
->lock
);
3121 /* TODO: Ideally aggregation should be done on dequeue to remain
3122 * responsive to environment changes.
3126 flow
= fq_flow_classify(fq
, tin
, skb
, fq_flow_get_default_func
);
3127 head
= skb_peek_tail(&flow
->queue
);
3131 orig_len
= head
->len
;
3133 if (skb
->len
+ head
->len
> max_amsdu_len
)
3136 if (!ieee80211_amsdu_prepare_head(sdata
, fast_tx
, head
))
3139 nfrags
= 1 + skb_shinfo(skb
)->nr_frags
;
3140 nfrags
+= 1 + skb_shinfo(head
)->nr_frags
;
3141 frag_tail
= &skb_shinfo(head
)->frag_list
;
3142 while (*frag_tail
) {
3143 nfrags
+= 1 + skb_shinfo(*frag_tail
)->nr_frags
;
3144 frag_tail
= &(*frag_tail
)->next
;
3148 if (max_subframes
&& n
> max_subframes
)
3151 if (max_frags
&& nfrags
> max_frags
)
3154 if (!ieee80211_amsdu_realloc_pad(local
, skb
, sizeof(rfc1042_header
) + 2,
3159 data
= skb_push(skb
, ETH_ALEN
+ 2);
3160 memmove(data
, data
+ ETH_ALEN
+ 2, 2 * ETH_ALEN
);
3162 data
+= 2 * ETH_ALEN
;
3163 len
= cpu_to_be16(subframe_len
);
3164 memcpy(data
, &len
, 2);
3165 memcpy(data
+ 2, rfc1042_header
, sizeof(rfc1042_header
));
3167 head
->len
+= skb
->len
;
3168 head
->data_len
+= skb
->len
;
3171 flow
->backlog
+= head
->len
- orig_len
;
3172 tin
->backlog_bytes
+= head
->len
- orig_len
;
3174 fq_recalc_backlog(fq
, tin
, flow
);
3177 spin_unlock_bh(&fq
->lock
);
3182 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data
*sdata
,
3183 struct net_device
*dev
, struct sta_info
*sta
,
3184 struct ieee80211_fast_tx
*fast_tx
,
3185 struct sk_buff
*skb
)
3187 struct ieee80211_local
*local
= sdata
->local
;
3188 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
3189 int extra_head
= fast_tx
->hdr_len
- (ETH_HLEN
- 2);
3190 int hw_headroom
= sdata
->local
->hw
.extra_tx_headroom
;
3192 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3193 struct ieee80211_hdr
*hdr
= (void *)fast_tx
->hdr
;
3194 struct ieee80211_tx_data tx
;
3195 ieee80211_tx_result r
;
3196 struct tid_ampdu_tx
*tid_tx
= NULL
;
3197 u8 tid
= IEEE80211_NUM_TIDS
;
3199 /* control port protocol needs a lot of special handling */
3200 if (cpu_to_be16(ethertype
) == sdata
->control_port_protocol
)
3203 /* only RFC 1042 SNAP */
3204 if (ethertype
< ETH_P_802_3_MIN
)
3207 /* don't handle TX status request here either */
3208 if (skb
->sk
&& skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)
3211 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3212 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
3213 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
3215 if (!test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
))
3217 if (tid_tx
->timeout
)
3218 tid_tx
->last_tx
= jiffies
;
3222 /* after this point (skb is modified) we cannot return false */
3224 if (skb_shared(skb
)) {
3225 struct sk_buff
*tmp_skb
= skb
;
3227 skb
= skb_clone(skb
, GFP_ATOMIC
);
3234 ieee80211_tx_stats(dev
, skb
->len
+ extra_head
);
3236 if ((hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) &&
3237 ieee80211_amsdu_aggregate(sdata
, sta
, fast_tx
, skb
))
3240 /* will not be crypto-handled beyond what we do here, so use false
3241 * as the may-encrypt argument for the resize to not account for
3242 * more room than we already have in 'extra_head'
3244 if (unlikely(ieee80211_skb_resize(sdata
, skb
,
3245 max_t(int, extra_head
+ hw_headroom
-
3246 skb_headroom(skb
), 0),
3252 memcpy(ð
, skb
->data
, ETH_HLEN
- 2);
3253 hdr
= (void *)skb_push(skb
, extra_head
);
3254 memcpy(skb
->data
, fast_tx
->hdr
, fast_tx
->hdr_len
);
3255 memcpy(skb
->data
+ fast_tx
->da_offs
, eth
.h_dest
, ETH_ALEN
);
3256 memcpy(skb
->data
+ fast_tx
->sa_offs
, eth
.h_source
, ETH_ALEN
);
3258 memset(info
, 0, sizeof(*info
));
3259 info
->band
= fast_tx
->band
;
3260 info
->control
.vif
= &sdata
->vif
;
3261 info
->flags
= IEEE80211_TX_CTL_FIRST_FRAGMENT
|
3262 IEEE80211_TX_CTL_DONTFRAG
|
3263 (tid_tx
? IEEE80211_TX_CTL_AMPDU
: 0);
3265 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
3266 *ieee80211_get_qos_ctl(hdr
) = tid
;
3267 if (!sta
->sta
.txq
[0])
3268 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, tid
);
3270 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
3271 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence_number
);
3272 sdata
->sequence_number
+= 0x10;
3275 if (skb_shinfo(skb
)->gso_size
)
3276 sta
->tx_stats
.msdu
[tid
] +=
3277 DIV_ROUND_UP(skb
->len
, skb_shinfo(skb
)->gso_size
);
3279 sta
->tx_stats
.msdu
[tid
]++;
3281 info
->hw_queue
= sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
3283 __skb_queue_head_init(&tx
.skbs
);
3285 tx
.flags
= IEEE80211_TX_UNICAST
;
3289 tx
.key
= fast_tx
->key
;
3292 info
->control
.hw_key
= &fast_tx
->key
->conf
;
3294 if (!ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
3296 r
= ieee80211_tx_h_rate_ctrl(&tx
);
3300 if (r
!= TX_CONTINUE
) {
3307 /* statistics normally done by ieee80211_tx_h_stats (but that
3308 * has to consider fragmentation, so is more complex)
3310 sta
->tx_stats
.bytes
[skb_get_queue_mapping(skb
)] += skb
->len
;
3311 sta
->tx_stats
.packets
[skb_get_queue_mapping(skb
)]++;
3313 if (fast_tx
->pn_offs
) {
3315 u8
*crypto_hdr
= skb
->data
+ fast_tx
->pn_offs
;
3317 switch (fast_tx
->key
->conf
.cipher
) {
3318 case WLAN_CIPHER_SUITE_CCMP
:
3319 case WLAN_CIPHER_SUITE_CCMP_256
:
3320 case WLAN_CIPHER_SUITE_GCMP
:
3321 case WLAN_CIPHER_SUITE_GCMP_256
:
3322 pn
= atomic64_inc_return(&fast_tx
->key
->conf
.tx_pn
);
3324 crypto_hdr
[1] = pn
>> 8;
3325 crypto_hdr
[4] = pn
>> 16;
3326 crypto_hdr
[5] = pn
>> 24;
3327 crypto_hdr
[6] = pn
>> 32;
3328 crypto_hdr
[7] = pn
>> 40;
3333 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3334 sdata
= container_of(sdata
->bss
,
3335 struct ieee80211_sub_if_data
, u
.ap
);
3337 __skb_queue_tail(&tx
.skbs
, skb
);
3338 ieee80211_tx_frags(local
, &sdata
->vif
, &sta
->sta
, &tx
.skbs
, false);
3342 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3343 struct net_device
*dev
,
3346 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
3347 struct sta_info
*sta
;
3348 struct sk_buff
*next
;
3350 if (unlikely(skb
->len
< ETH_HLEN
)) {
3357 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
))
3360 if (!IS_ERR_OR_NULL(sta
)) {
3361 struct ieee80211_fast_tx
*fast_tx
;
3363 fast_tx
= rcu_dereference(sta
->fast_tx
);
3366 ieee80211_xmit_fast(sdata
, dev
, sta
, fast_tx
, skb
))
3370 if (skb_is_gso(skb
)) {
3371 struct sk_buff
*segs
;
3373 segs
= skb_gso_segment(skb
, 0);
3381 /* we cannot process non-linear frames on this path */
3382 if (skb_linearize(skb
)) {
3387 /* the frame could be fragmented, software-encrypted, and other
3388 * things so we cannot really handle checksum offload with it -
3389 * fix it up in software before we handle anything else.
3391 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3392 skb_set_transport_header(skb
,
3393 skb_checksum_start_offset(skb
));
3394 if (skb_checksum_help(skb
))
3407 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3411 ieee80211_tx_stats(dev
, skb
->len
);
3413 ieee80211_xmit(sdata
, sta
, skb
);
3423 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3424 * @skb: packet to be sent
3425 * @dev: incoming interface
3427 * On failure skb will be freed.
3429 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3430 struct net_device
*dev
)
3432 __ieee80211_subif_start_xmit(skb
, dev
, 0);
3433 return NETDEV_TX_OK
;
3437 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
3438 struct sk_buff
*skb
, u32 info_flags
)
3440 struct ieee80211_hdr
*hdr
;
3441 struct ieee80211_tx_data tx
= {
3442 .local
= sdata
->local
,
3445 struct sta_info
*sta
;
3449 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
)) {
3451 skb
= ERR_PTR(-EINVAL
);
3455 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3459 hdr
= (void *)skb
->data
;
3460 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
3463 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
3466 return ERR_PTR(-EINVAL
);
3475 * ieee80211_clear_tx_pending may not be called in a context where
3476 * it is possible that it packets could come in again.
3478 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
3480 struct sk_buff
*skb
;
3483 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3484 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
3485 ieee80211_free_txskb(&local
->hw
, skb
);
3490 * Returns false if the frame couldn't be transmitted but was queued instead,
3491 * which in this case means re-queued -- take as an indication to stop sending
3492 * more pending frames.
3494 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
3495 struct sk_buff
*skb
)
3497 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3498 struct ieee80211_sub_if_data
*sdata
;
3499 struct sta_info
*sta
;
3500 struct ieee80211_hdr
*hdr
;
3502 struct ieee80211_chanctx_conf
*chanctx_conf
;
3504 sdata
= vif_to_sdata(info
->control
.vif
);
3506 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
3507 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3508 if (unlikely(!chanctx_conf
)) {
3512 info
->band
= chanctx_conf
->def
.chan
->band
;
3513 result
= ieee80211_tx(sdata
, NULL
, skb
, true);
3515 struct sk_buff_head skbs
;
3517 __skb_queue_head_init(&skbs
);
3518 __skb_queue_tail(&skbs
, skb
);
3520 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3521 sta
= sta_info_get(sdata
, hdr
->addr1
);
3523 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
3530 * Transmit all pending packets. Called from tasklet.
3532 void ieee80211_tx_pending(unsigned long data
)
3534 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
3535 unsigned long flags
;
3541 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
3542 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3544 * If queue is stopped by something other than due to pending
3545 * frames, or we have no pending frames, proceed to next queue.
3547 if (local
->queue_stop_reasons
[i
] ||
3548 skb_queue_empty(&local
->pending
[i
]))
3551 while (!skb_queue_empty(&local
->pending
[i
])) {
3552 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
3553 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3555 if (WARN_ON(!info
->control
.vif
)) {
3556 ieee80211_free_txskb(&local
->hw
, skb
);
3560 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
3563 txok
= ieee80211_tx_pending_skb(local
, skb
);
3564 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
3570 if (skb_queue_empty(&local
->pending
[i
]))
3571 ieee80211_propagate_queue_wake(local
, i
);
3573 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
3578 /* functions for drivers to get certain frames */
3580 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3581 struct ps_data
*ps
, struct sk_buff
*skb
,
3586 int i
, have_bits
= 0, n1
, n2
;
3588 /* Generate bitmap for TIM only if there are any STAs in power save
3590 if (atomic_read(&ps
->num_sta_ps
) > 0)
3591 /* in the hope that this is faster than
3592 * checking byte-for-byte */
3593 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
3594 IEEE80211_MAX_AID
+1);
3596 if (ps
->dtim_count
== 0)
3597 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
3602 tim
= pos
= (u8
*) skb_put(skb
, 6);
3603 *pos
++ = WLAN_EID_TIM
;
3605 *pos
++ = ps
->dtim_count
;
3606 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
3608 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
3611 ps
->dtim_bc_mc
= aid0
== 1;
3614 /* Find largest even number N1 so that bits numbered 1 through
3615 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3616 * (N2 + 1) x 8 through 2007 are 0. */
3618 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
3625 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
3632 /* Bitmap control */
3634 /* Part Virt Bitmap */
3635 skb_put(skb
, n2
- n1
);
3636 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
3638 tim
[1] = n2
- n1
+ 4;
3640 *pos
++ = aid0
; /* Bitmap control */
3641 *pos
++ = 0; /* Part Virt Bitmap */
3645 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3646 struct ps_data
*ps
, struct sk_buff
*skb
,
3649 struct ieee80211_local
*local
= sdata
->local
;
3652 * Not very nice, but we want to allow the driver to call
3653 * ieee80211_beacon_get() as a response to the set_tim()
3654 * callback. That, however, is already invoked under the
3655 * sta_lock to guarantee consistent and race-free update
3656 * of the tim bitmap in mac80211 and the driver.
3658 if (local
->tim_in_locked_section
) {
3659 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3661 spin_lock_bh(&local
->tim_lock
);
3662 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3663 spin_unlock_bh(&local
->tim_lock
);
3669 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
3670 struct beacon_data
*beacon
)
3672 struct probe_resp
*resp
;
3674 size_t beacon_data_len
;
3676 u8 count
= beacon
->csa_current_counter
;
3678 switch (sdata
->vif
.type
) {
3679 case NL80211_IFTYPE_AP
:
3680 beacon_data
= beacon
->tail
;
3681 beacon_data_len
= beacon
->tail_len
;
3683 case NL80211_IFTYPE_ADHOC
:
3684 beacon_data
= beacon
->head
;
3685 beacon_data_len
= beacon
->head_len
;
3687 case NL80211_IFTYPE_MESH_POINT
:
3688 beacon_data
= beacon
->head
;
3689 beacon_data_len
= beacon
->head_len
;
3696 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
3697 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
3699 if (beacon
->csa_counter_offsets
[i
]) {
3700 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
3706 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
3709 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
3710 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
3715 static u8
__ieee80211_csa_update_counter(struct beacon_data
*beacon
)
3717 beacon
->csa_current_counter
--;
3719 /* the counter should never reach 0 */
3720 WARN_ON_ONCE(!beacon
->csa_current_counter
);
3722 return beacon
->csa_current_counter
;
3725 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
3727 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3728 struct beacon_data
*beacon
= NULL
;
3733 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3734 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
3735 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
3736 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
3737 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
3738 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
3743 count
= __ieee80211_csa_update_counter(beacon
);
3749 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
3751 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
3753 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3754 struct beacon_data
*beacon
= NULL
;
3756 size_t beacon_data_len
;
3759 if (!ieee80211_sdata_running(sdata
))
3763 if (vif
->type
== NL80211_IFTYPE_AP
) {
3764 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3766 beacon
= rcu_dereference(ap
->beacon
);
3767 if (WARN_ON(!beacon
|| !beacon
->tail
))
3769 beacon_data
= beacon
->tail
;
3770 beacon_data_len
= beacon
->tail_len
;
3771 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
3772 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3774 beacon
= rcu_dereference(ifibss
->presp
);
3778 beacon_data
= beacon
->head
;
3779 beacon_data_len
= beacon
->head_len
;
3780 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
3781 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3783 beacon
= rcu_dereference(ifmsh
->beacon
);
3787 beacon_data
= beacon
->head
;
3788 beacon_data_len
= beacon
->head_len
;
3794 if (!beacon
->csa_counter_offsets
[0])
3797 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
3800 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
3807 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
3809 static struct sk_buff
*
3810 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
3811 struct ieee80211_vif
*vif
,
3812 struct ieee80211_mutable_offsets
*offs
,
3815 struct ieee80211_local
*local
= hw_to_local(hw
);
3816 struct beacon_data
*beacon
= NULL
;
3817 struct sk_buff
*skb
= NULL
;
3818 struct ieee80211_tx_info
*info
;
3819 struct ieee80211_sub_if_data
*sdata
= NULL
;
3820 enum nl80211_band band
;
3821 struct ieee80211_tx_rate_control txrc
;
3822 struct ieee80211_chanctx_conf
*chanctx_conf
;
3823 int csa_off_base
= 0;
3827 sdata
= vif_to_sdata(vif
);
3828 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3830 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
3834 memset(offs
, 0, sizeof(*offs
));
3836 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3837 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3839 beacon
= rcu_dereference(ap
->beacon
);
3841 if (beacon
->csa_counter_offsets
[0]) {
3843 __ieee80211_csa_update_counter(beacon
);
3845 ieee80211_set_csa(sdata
, beacon
);
3849 * headroom, head length,
3850 * tail length and maximum TIM length
3852 skb
= dev_alloc_skb(local
->tx_headroom
+
3854 beacon
->tail_len
+ 256 +
3855 local
->hw
.extra_beacon_tailroom
);
3859 skb_reserve(skb
, local
->tx_headroom
);
3860 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3863 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
3867 offs
->tim_offset
= beacon
->head_len
;
3868 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3870 /* for AP the csa offsets are from tail */
3871 csa_off_base
= skb
->len
;
3875 memcpy(skb_put(skb
, beacon
->tail_len
),
3876 beacon
->tail
, beacon
->tail_len
);
3879 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
3880 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3881 struct ieee80211_hdr
*hdr
;
3883 beacon
= rcu_dereference(ifibss
->presp
);
3887 if (beacon
->csa_counter_offsets
[0]) {
3889 __ieee80211_csa_update_counter(beacon
);
3891 ieee80211_set_csa(sdata
, beacon
);
3894 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
3895 local
->hw
.extra_beacon_tailroom
);
3898 skb_reserve(skb
, local
->tx_headroom
);
3899 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3902 hdr
= (struct ieee80211_hdr
*) skb
->data
;
3903 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3904 IEEE80211_STYPE_BEACON
);
3905 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3906 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3908 beacon
= rcu_dereference(ifmsh
->beacon
);
3912 if (beacon
->csa_counter_offsets
[0]) {
3914 /* TODO: For mesh csa_counter is in TU, so
3915 * decrementing it by one isn't correct, but
3916 * for now we leave it consistent with overall
3917 * mac80211's behavior.
3919 __ieee80211_csa_update_counter(beacon
);
3921 ieee80211_set_csa(sdata
, beacon
);
3924 if (ifmsh
->sync_ops
)
3925 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
3927 skb
= dev_alloc_skb(local
->tx_headroom
+
3931 local
->hw
.extra_beacon_tailroom
);
3934 skb_reserve(skb
, local
->tx_headroom
);
3935 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3937 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
3940 offs
->tim_offset
= beacon
->head_len
;
3941 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3944 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
3952 if (offs
&& beacon
) {
3955 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
3956 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
3961 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
3965 band
= chanctx_conf
->def
.chan
->band
;
3967 info
= IEEE80211_SKB_CB(skb
);
3969 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
3970 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
3973 memset(&txrc
, 0, sizeof(txrc
));
3975 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
3976 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
3978 txrc
.reported_rate
.idx
= -1;
3979 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
3980 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
3981 txrc
.max_rate_idx
= -1;
3983 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
3985 rate_control_get_rate(sdata
, NULL
, &txrc
);
3987 info
->control
.vif
= vif
;
3989 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
3990 IEEE80211_TX_CTL_ASSIGN_SEQ
|
3991 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
3999 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
4000 struct ieee80211_vif
*vif
,
4001 struct ieee80211_mutable_offsets
*offs
)
4003 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
4005 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
4007 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
4008 struct ieee80211_vif
*vif
,
4009 u16
*tim_offset
, u16
*tim_length
)
4011 struct ieee80211_mutable_offsets offs
= {};
4012 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
4013 struct sk_buff
*copy
;
4014 struct ieee80211_supported_band
*sband
;
4021 *tim_offset
= offs
.tim_offset
;
4024 *tim_length
= offs
.tim_length
;
4026 if (ieee80211_hw_check(hw
, BEACON_TX_STATUS
) ||
4027 !hw_to_local(hw
)->monitors
)
4030 /* send a copy to monitor interfaces */
4031 copy
= skb_copy(bcn
, GFP_ATOMIC
);
4035 shift
= ieee80211_vif_get_shift(vif
);
4036 sband
= hw
->wiphy
->bands
[ieee80211_get_sdata_band(vif_to_sdata(vif
))];
4037 ieee80211_tx_monitor(hw_to_local(hw
), copy
, sband
, 1, shift
, false);
4041 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
4043 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
4044 struct ieee80211_vif
*vif
)
4046 struct ieee80211_if_ap
*ap
= NULL
;
4047 struct sk_buff
*skb
= NULL
;
4048 struct probe_resp
*presp
= NULL
;
4049 struct ieee80211_hdr
*hdr
;
4050 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
4052 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
4058 presp
= rcu_dereference(ap
->probe_resp
);
4062 skb
= dev_alloc_skb(presp
->len
);
4066 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
4068 hdr
= (struct ieee80211_hdr
*) skb
->data
;
4069 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
4075 EXPORT_SYMBOL(ieee80211_proberesp_get
);
4077 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
4078 struct ieee80211_vif
*vif
)
4080 struct ieee80211_sub_if_data
*sdata
;
4081 struct ieee80211_if_managed
*ifmgd
;
4082 struct ieee80211_pspoll
*pspoll
;
4083 struct ieee80211_local
*local
;
4084 struct sk_buff
*skb
;
4086 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4089 sdata
= vif_to_sdata(vif
);
4090 ifmgd
= &sdata
->u
.mgd
;
4091 local
= sdata
->local
;
4093 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
4097 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4099 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
4100 memset(pspoll
, 0, sizeof(*pspoll
));
4101 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
4102 IEEE80211_STYPE_PSPOLL
);
4103 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
4105 /* aid in PS-Poll has its two MSBs each set to 1 */
4106 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
4108 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
4109 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
4113 EXPORT_SYMBOL(ieee80211_pspoll_get
);
4115 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
4116 struct ieee80211_vif
*vif
)
4118 struct ieee80211_hdr_3addr
*nullfunc
;
4119 struct ieee80211_sub_if_data
*sdata
;
4120 struct ieee80211_if_managed
*ifmgd
;
4121 struct ieee80211_local
*local
;
4122 struct sk_buff
*skb
;
4124 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
4127 sdata
= vif_to_sdata(vif
);
4128 ifmgd
= &sdata
->u
.mgd
;
4129 local
= sdata
->local
;
4131 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
4135 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4137 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
4139 memset(nullfunc
, 0, sizeof(*nullfunc
));
4140 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
4141 IEEE80211_STYPE_NULLFUNC
|
4142 IEEE80211_FCTL_TODS
);
4143 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
4144 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
4145 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
4149 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
4151 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
4153 const u8
*ssid
, size_t ssid_len
,
4156 struct ieee80211_local
*local
= hw_to_local(hw
);
4157 struct ieee80211_hdr_3addr
*hdr
;
4158 struct sk_buff
*skb
;
4162 ie_ssid_len
= 2 + ssid_len
;
4164 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
4165 ie_ssid_len
+ tailroom
);
4169 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
4171 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
4172 memset(hdr
, 0, sizeof(*hdr
));
4173 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
4174 IEEE80211_STYPE_PROBE_REQ
);
4175 eth_broadcast_addr(hdr
->addr1
);
4176 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
4177 eth_broadcast_addr(hdr
->addr3
);
4179 pos
= skb_put(skb
, ie_ssid_len
);
4180 *pos
++ = WLAN_EID_SSID
;
4183 memcpy(pos
, ssid
, ssid_len
);
4188 EXPORT_SYMBOL(ieee80211_probereq_get
);
4190 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4191 const void *frame
, size_t frame_len
,
4192 const struct ieee80211_tx_info
*frame_txctl
,
4193 struct ieee80211_rts
*rts
)
4195 const struct ieee80211_hdr
*hdr
= frame
;
4197 rts
->frame_control
=
4198 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
4199 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
4201 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
4202 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
4204 EXPORT_SYMBOL(ieee80211_rts_get
);
4206 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
4207 const void *frame
, size_t frame_len
,
4208 const struct ieee80211_tx_info
*frame_txctl
,
4209 struct ieee80211_cts
*cts
)
4211 const struct ieee80211_hdr
*hdr
= frame
;
4213 cts
->frame_control
=
4214 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
4215 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
4216 frame_len
, frame_txctl
);
4217 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
4219 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
4222 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
4223 struct ieee80211_vif
*vif
)
4225 struct ieee80211_local
*local
= hw_to_local(hw
);
4226 struct sk_buff
*skb
= NULL
;
4227 struct ieee80211_tx_data tx
;
4228 struct ieee80211_sub_if_data
*sdata
;
4230 struct ieee80211_tx_info
*info
;
4231 struct ieee80211_chanctx_conf
*chanctx_conf
;
4233 sdata
= vif_to_sdata(vif
);
4236 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
4241 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
4242 struct beacon_data
*beacon
=
4243 rcu_dereference(sdata
->u
.ap
.beacon
);
4245 if (!beacon
|| !beacon
->head
)
4248 ps
= &sdata
->u
.ap
.ps
;
4249 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
4250 ps
= &sdata
->u
.mesh
.ps
;
4255 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
4256 goto out
; /* send buffered bc/mc only after DTIM beacon */
4259 skb
= skb_dequeue(&ps
->bc_buf
);
4262 local
->total_ps_buffered
--;
4264 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
4265 struct ieee80211_hdr
*hdr
=
4266 (struct ieee80211_hdr
*) skb
->data
;
4267 /* more buffered multicast/broadcast frames ==> set
4268 * MoreData flag in IEEE 802.11 header to inform PS
4270 hdr
->frame_control
|=
4271 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
4274 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
4275 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
4276 if (!ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
))
4278 ieee80211_free_txskb(hw
, skb
);
4281 info
= IEEE80211_SKB_CB(skb
);
4283 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
4284 info
->band
= chanctx_conf
->def
.chan
->band
;
4286 if (invoke_tx_handlers(&tx
))
4293 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
4295 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4297 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4298 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4299 struct ieee80211_local
*local
= sdata
->local
;
4303 lockdep_assert_held(&local
->sta_mtx
);
4305 /* only some cases are supported right now */
4306 switch (sdata
->vif
.type
) {
4307 case NL80211_IFTYPE_STATION
:
4308 case NL80211_IFTYPE_AP
:
4309 case NL80211_IFTYPE_AP_VLAN
:
4316 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
4319 if (sta
->reserved_tid
== tid
) {
4324 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
4325 sdata_err(sdata
, "TID reservation already active\n");
4330 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
4331 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4335 /* Tear down BA sessions so we stop aggregating on this TID */
4336 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
)) {
4337 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4338 __ieee80211_stop_tx_ba_session(sta
, tid
,
4339 AGG_STOP_LOCAL_REQUEST
);
4342 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
4343 __ieee80211_flush_queues(local
, sdata
, queues
, false);
4345 sta
->reserved_tid
= tid
;
4347 ieee80211_wake_vif_queues(local
, sdata
,
4348 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
4350 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
))
4351 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
4357 EXPORT_SYMBOL(ieee80211_reserve_tid
);
4359 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
4361 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
4362 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
4364 lockdep_assert_held(&sdata
->local
->sta_mtx
);
4366 /* only some cases are supported right now */
4367 switch (sdata
->vif
.type
) {
4368 case NL80211_IFTYPE_STATION
:
4369 case NL80211_IFTYPE_AP
:
4370 case NL80211_IFTYPE_AP_VLAN
:
4377 if (tid
!= sta
->reserved_tid
) {
4378 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
4382 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
4384 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
4386 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
4387 struct sk_buff
*skb
, int tid
,
4388 enum nl80211_band band
)
4390 int ac
= ieee802_1d_to_ac
[tid
& 7];
4392 skb_reset_mac_header(skb
);
4393 skb_reset_network_header(skb
);
4394 skb_reset_transport_header(skb
);
4396 skb_set_queue_mapping(skb
, ac
);
4397 skb
->priority
= tid
;
4399 skb
->dev
= sdata
->dev
;
4402 * The other path calling ieee80211_xmit is from the tasklet,
4403 * and while we can handle concurrent transmissions locking
4404 * requirements are that we do not come into tx with bhs on.
4407 IEEE80211_SKB_CB(skb
)->band
= band
;
4408 ieee80211_xmit(sdata
, NULL
, skb
);