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 <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static inline void ieee80211_tx_stats(struct net_device
*dev
, u32 len
)
42 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
44 u64_stats_update_begin(&tstats
->syncp
);
46 tstats
->tx_bytes
+= len
;
47 u64_stats_update_end(&tstats
->syncp
);
50 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
51 struct sk_buff
*skb
, int group_addr
,
54 int rate
, mrate
, erp
, dur
, i
, shift
= 0;
55 struct ieee80211_rate
*txrate
;
56 struct ieee80211_local
*local
= tx
->local
;
57 struct ieee80211_supported_band
*sband
;
58 struct ieee80211_hdr
*hdr
;
59 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
60 struct ieee80211_chanctx_conf
*chanctx_conf
;
64 chanctx_conf
= rcu_dereference(tx
->sdata
->vif
.chanctx_conf
);
66 shift
= ieee80211_chandef_get_shift(&chanctx_conf
->def
);
67 rate_flags
= ieee80211_chandef_rate_flags(&chanctx_conf
->def
);
71 /* assume HW handles this */
72 if (tx
->rate
.flags
& (IEEE80211_TX_RC_MCS
| IEEE80211_TX_RC_VHT_MCS
))
76 if (WARN_ON_ONCE(tx
->rate
.idx
< 0))
79 sband
= local
->hw
.wiphy
->bands
[info
->band
];
80 txrate
= &sband
->bitrates
[tx
->rate
.idx
];
82 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
85 * data and mgmt (except PS Poll):
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
101 hdr
= (struct ieee80211_hdr
*)skb
->data
;
102 if (ieee80211_is_ctl(hdr
->frame_control
)) {
103 /* TODO: These control frames are not currently sent by
104 * mac80211, but should they be implemented, this function
105 * needs to be updated to support duration field calculation.
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
115 * PS Poll: BIT(15) | BIT(14) | aid
121 if (0 /* FIX: data/mgmt during CFP */)
122 return cpu_to_le16(32768);
124 if (group_addr
) /* Group address as the destination - no ACK */
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
138 /* use lowest available if everything fails */
139 mrate
= sband
->bitrates
[0].bitrate
;
140 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
141 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
143 if (r
->bitrate
> txrate
->bitrate
)
146 if ((rate_flags
& r
->flags
) != rate_flags
)
149 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
150 rate
= DIV_ROUND_UP(r
->bitrate
, 1 << shift
);
152 switch (sband
->band
) {
153 case IEEE80211_BAND_2GHZ
: {
155 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
156 flag
= IEEE80211_RATE_MANDATORY_G
;
158 flag
= IEEE80211_RATE_MANDATORY_B
;
163 case IEEE80211_BAND_5GHZ
:
164 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
167 case IEEE80211_BAND_60GHZ
:
168 /* TODO, for now fall through */
169 case IEEE80211_NUM_BANDS
:
175 /* No matching basic rate found; use highest suitable mandatory
177 rate
= DIV_ROUND_UP(mrate
, 1 << shift
);
180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
182 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
189 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur
*= 2; /* ACK + SIFS */
197 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
198 txrate
->bitrate
, erp
,
199 tx
->sdata
->vif
.bss_conf
.use_short_preamble
,
203 return cpu_to_le16(dur
);
207 static ieee80211_tx_result debug_noinline
208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
210 struct ieee80211_local
*local
= tx
->local
;
211 struct ieee80211_if_managed
*ifmgd
;
213 /* driver doesn't support power save */
214 if (!ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
))
217 /* hardware does dynamic power save */
218 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
))
221 /* dynamic power save disabled */
222 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
225 /* we are scanning, don't enable power save */
229 if (!local
->ps_sdata
)
232 /* No point if we're going to suspend */
233 if (local
->quiescing
)
236 /* dynamic ps is supported only in managed mode */
237 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
240 ifmgd
= &tx
->sdata
->u
.mgd
;
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
255 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
) &&
256 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
257 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
260 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
261 ieee80211_stop_queues_by_reason(&local
->hw
,
262 IEEE80211_MAX_QUEUE_MAP
,
263 IEEE80211_QUEUE_STOP_REASON_PS
,
265 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
266 ieee80211_queue_work(&local
->hw
,
267 &local
->dynamic_ps_disable_work
);
270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd
->associated
)
274 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
275 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
280 static ieee80211_tx_result debug_noinline
281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
284 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
285 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
288 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
291 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
293 !ieee80211_is_probe_req(hdr
->frame_control
) &&
294 !ieee80211_is_nullfunc(hdr
->frame_control
))
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
)
311 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
314 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
318 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
320 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
321 if (unlikely(!assoc
&&
322 ieee80211_is_data(hdr
->frame_control
))) {
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 sdata_info(tx
->sdata
,
325 "dropped data frame to not associated station %pM\n",
328 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
331 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
332 ieee80211_is_data(hdr
->frame_control
) &&
333 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
335 * No associated STAs - no need to send multicast
344 /* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
350 int total
= 0, purged
= 0;
352 struct ieee80211_sub_if_data
*sdata
;
353 struct sta_info
*sta
;
355 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
358 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
359 ps
= &sdata
->u
.ap
.ps
;
360 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
361 ps
= &sdata
->u
.mesh
.ps
;
365 skb
= skb_dequeue(&ps
->bc_buf
);
370 total
+= skb_queue_len(&ps
->bc_buf
);
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
377 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
380 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
381 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
382 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
385 ieee80211_free_txskb(&local
->hw
, skb
);
391 local
->total_ps_buffered
= total
;
392 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
395 static ieee80211_tx_result
396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
398 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
399 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
403 * broadcast/multicast frame
405 * If any of the associated/peer stations is in power save mode,
406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
411 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
412 tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
416 ps
= &tx
->sdata
->bss
->ps
;
417 } else if (ieee80211_vif_is_mesh(&tx
->sdata
->vif
)) {
418 ps
= &tx
->sdata
->u
.mesh
.ps
;
424 /* no buffering for ordered frames */
425 if (ieee80211_has_order(hdr
->frame_control
))
428 if (ieee80211_is_probe_req(hdr
->frame_control
))
431 if (ieee80211_hw_check(&tx
->local
->hw
, QUEUE_CONTROL
))
432 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
434 /* no stations in PS mode */
435 if (!atomic_read(&ps
->num_sta_ps
))
438 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
440 /* device releases frame after DTIM beacon */
441 if (!ieee80211_hw_check(&tx
->local
->hw
, HOST_BROADCAST_PS_BUFFERING
))
444 /* buffered in mac80211 */
445 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
446 purge_old_ps_buffers(tx
->local
);
448 if (skb_queue_len(&ps
->bc_buf
) >= AP_MAX_BC_BUFFER
) {
450 "BC TX buffer full - dropping the oldest frame\n");
451 dev_kfree_skb(skb_dequeue(&ps
->bc_buf
));
453 tx
->local
->total_ps_buffered
++;
455 skb_queue_tail(&ps
->bc_buf
, tx
->skb
);
460 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
463 if (!ieee80211_is_mgmt(fc
))
466 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
469 if (!ieee80211_is_robust_mgmt_frame(skb
))
475 static ieee80211_tx_result
476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
478 struct sta_info
*sta
= tx
->sta
;
479 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
480 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
481 struct ieee80211_local
*local
= tx
->local
;
486 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
487 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
488 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) &&
489 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
490 int ac
= skb_get_queue_mapping(tx
->skb
);
492 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
493 !ieee80211_is_bufferable_mmpdu(hdr
->frame_control
)) {
494 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
498 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
500 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
501 purge_old_ps_buffers(tx
->local
);
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta
->ps_lock
);
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
510 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
) &&
511 !test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) &&
512 !test_sta_flag(sta
, WLAN_STA_PS_DELIVER
)) {
513 spin_unlock(&sta
->ps_lock
);
517 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
518 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
522 ieee80211_free_txskb(&local
->hw
, old
);
524 tx
->local
->total_ps_buffered
++;
526 info
->control
.jiffies
= jiffies
;
527 info
->control
.vif
= &tx
->sdata
->vif
;
528 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
529 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
;
530 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
531 spin_unlock(&sta
->ps_lock
);
533 if (!timer_pending(&local
->sta_cleanup
))
534 mod_timer(&local
->sta_cleanup
,
535 round_jiffies(jiffies
+
536 STA_INFO_CLEANUP_INTERVAL
));
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
542 sta_info_recalc_tim(sta
);
545 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
557 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
560 if (tx
->flags
& IEEE80211_TX_UNICAST
)
561 return ieee80211_tx_h_unicast_ps_buf(tx
);
563 return ieee80211_tx_h_multicast_ps_buf(tx
);
566 static ieee80211_tx_result debug_noinline
567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
569 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
571 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
)) {
572 if (tx
->sdata
->control_port_no_encrypt
)
573 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
574 info
->control
.flags
|= IEEE80211_TX_CTRL_PORT_CTRL_PROTO
;
575 info
->flags
|= IEEE80211_TX_CTL_USE_MINRATE
;
581 static ieee80211_tx_result debug_noinline
582 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
584 struct ieee80211_key
*key
;
585 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
586 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
588 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
591 (key
= rcu_dereference(tx
->sta
->ptk
[tx
->sta
->ptk_idx
])))
593 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
594 is_multicast_ether_addr(hdr
->addr1
) &&
595 ieee80211_is_robust_mgmt_frame(tx
->skb
) &&
596 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
598 else if (is_multicast_ether_addr(hdr
->addr1
) &&
599 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
601 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
602 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
608 bool skip_hw
= false;
610 /* TODO: add threshold stuff again */
612 switch (tx
->key
->conf
.cipher
) {
613 case WLAN_CIPHER_SUITE_WEP40
:
614 case WLAN_CIPHER_SUITE_WEP104
:
615 case WLAN_CIPHER_SUITE_TKIP
:
616 if (!ieee80211_is_data_present(hdr
->frame_control
))
619 case WLAN_CIPHER_SUITE_CCMP
:
620 case WLAN_CIPHER_SUITE_CCMP_256
:
621 case WLAN_CIPHER_SUITE_GCMP
:
622 case WLAN_CIPHER_SUITE_GCMP_256
:
623 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
624 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
628 skip_hw
= (tx
->key
->conf
.flags
&
629 IEEE80211_KEY_FLAG_SW_MGMT_TX
) &&
630 ieee80211_is_mgmt(hdr
->frame_control
);
632 case WLAN_CIPHER_SUITE_AES_CMAC
:
633 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
634 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
636 if (!ieee80211_is_mgmt(hdr
->frame_control
))
641 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
&&
642 !ieee80211_is_deauth(hdr
->frame_control
)))
645 if (!skip_hw
&& tx
->key
&&
646 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
647 info
->control
.hw_key
= &tx
->key
->conf
;
653 static ieee80211_tx_result debug_noinline
654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
656 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
657 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
658 struct ieee80211_supported_band
*sband
;
660 struct ieee80211_tx_rate_control txrc
;
661 struct ieee80211_sta_rates
*ratetbl
= NULL
;
664 memset(&txrc
, 0, sizeof(txrc
));
666 sband
= tx
->local
->hw
.wiphy
->bands
[info
->band
];
668 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
669 tx
->local
->hw
.wiphy
->frag_threshold
);
671 /* set up the tx rate control struct we give the RC algo */
672 txrc
.hw
= &tx
->local
->hw
;
674 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
676 txrc
.reported_rate
.idx
= -1;
677 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[info
->band
];
678 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
679 txrc
.max_rate_idx
= -1;
681 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
683 if (tx
->sdata
->rc_has_mcs_mask
[info
->band
])
684 txrc
.rate_idx_mcs_mask
=
685 tx
->sdata
->rc_rateidx_mcs_mask
[info
->band
];
687 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
688 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
689 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
690 tx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
);
692 /* set up RTS protection if desired */
693 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
697 info
->control
.use_rts
= txrc
.rts
;
698 info
->control
.use_cts_prot
= tx
->sdata
->vif
.bss_conf
.use_cts_prot
;
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
706 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
707 (ieee80211_is_data(hdr
->frame_control
) ||
708 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
709 txrc
.short_preamble
= true;
711 info
->control
.short_preamble
= txrc
.short_preamble
;
714 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
717 * Lets not bother rate control if we're associated and cannot
718 * talk to the sta. This should not happen.
720 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
721 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
722 "%s: Dropped data frame as no usable bitrate found while "
723 "scanning and associated. Target station: "
724 "%pM on %d GHz band\n",
725 tx
->sdata
->name
, hdr
->addr1
,
730 * If we're associated with the sta at this point we know we can at
731 * least send the frame at the lowest bit rate.
733 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
735 if (tx
->sta
&& !info
->control
.skip_table
)
736 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
738 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
740 struct ieee80211_tx_rate rate
= {
741 .idx
= ratetbl
->rate
[0].idx
,
742 .flags
= ratetbl
->rate
[0].flags
,
743 .count
= ratetbl
->rate
[0].count
746 if (ratetbl
->rate
[0].idx
< 0)
754 tx
->rate
= info
->control
.rates
[0];
757 if (txrc
.reported_rate
.idx
< 0) {
758 txrc
.reported_rate
= tx
->rate
;
759 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
760 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
762 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
767 if (unlikely(!info
->control
.rates
[0].count
))
768 info
->control
.rates
[0].count
= 1;
770 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
771 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
772 info
->control
.rates
[0].count
= 1;
777 static __le16
ieee80211_tx_next_seq(struct sta_info
*sta
, int tid
)
779 u16
*seq
= &sta
->tid_seq
[tid
];
780 __le16 ret
= cpu_to_le16(*seq
);
782 /* Increase the sequence number. */
783 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
788 static ieee80211_tx_result debug_noinline
789 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
791 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
792 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
797 * Packet injection may want to control the sequence
798 * number, if we have no matching interface then we
799 * neither assign one ourselves nor ask the driver to.
801 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
804 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
807 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
810 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
814 * Anything but QoS data that has a sequence number field
815 * (is long enough) gets a sequence number from the global
816 * counter. QoS data frames with a multicast destination
817 * also use the global counter (802.11-2012 9.3.2.10).
819 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
820 is_multicast_ether_addr(hdr
->addr1
)) {
821 /* driver should assign sequence number */
822 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
823 /* for pure STA mode without beacons, we can do it */
824 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
825 tx
->sdata
->sequence_number
+= 0x10;
827 tx
->sta
->tx_msdu
[IEEE80211_NUM_TIDS
]++;
832 * This should be true for injected/management frames only, for
833 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
834 * above since they are not QoS-data frames.
839 /* include per-STA, per-TID sequence counter */
841 qc
= ieee80211_get_qos_ctl(hdr
);
842 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
843 tx
->sta
->tx_msdu
[tid
]++;
845 if (!tx
->sta
->sta
.txq
[0])
846 hdr
->seq_ctrl
= ieee80211_tx_next_seq(tx
->sta
, tid
);
851 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
852 struct sk_buff
*skb
, int hdrlen
,
855 struct ieee80211_local
*local
= tx
->local
;
856 struct ieee80211_tx_info
*info
;
858 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
859 int pos
= hdrlen
+ per_fragm
;
860 int rem
= skb
->len
- hdrlen
- per_fragm
;
862 if (WARN_ON(rem
< 0))
865 /* first fragment was already added to queue by caller */
868 int fraglen
= per_fragm
;
873 tmp
= dev_alloc_skb(local
->tx_headroom
+
875 tx
->sdata
->encrypt_headroom
+
876 IEEE80211_ENCRYPT_TAILROOM
);
880 __skb_queue_tail(&tx
->skbs
, tmp
);
883 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
885 /* copy control information */
886 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
888 info
= IEEE80211_SKB_CB(tmp
);
889 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
890 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
893 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
895 skb_copy_queue_mapping(tmp
, skb
);
896 tmp
->priority
= skb
->priority
;
899 /* copy header and data */
900 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
901 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
906 /* adjust first fragment's length */
907 skb_trim(skb
, hdrlen
+ per_fragm
);
911 static ieee80211_tx_result debug_noinline
912 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
914 struct sk_buff
*skb
= tx
->skb
;
915 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
916 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
917 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
921 /* no matter what happens, tx->skb moves to tx->skbs */
922 __skb_queue_tail(&tx
->skbs
, skb
);
925 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
928 if (tx
->local
->ops
->set_frag_threshold
)
932 * Warn when submitting a fragmented A-MPDU frame and drop it.
933 * This scenario is handled in ieee80211_tx_prepare but extra
934 * caution taken here as fragmented ampdu may cause Tx stop.
936 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
939 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
941 /* internal error, why isn't DONTFRAG set? */
942 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
946 * Now fragment the frame. This will allocate all the fragments and
947 * chain them (using skb as the first fragment) to skb->next.
948 * During transmission, we will remove the successfully transmitted
949 * fragments from this list. When the low-level driver rejects one
950 * of the fragments then we will simply pretend to accept the skb
951 * but store it away as pending.
953 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
956 /* update duration/seq/flags of fragments */
959 skb_queue_walk(&tx
->skbs
, skb
) {
960 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
962 hdr
= (void *)skb
->data
;
963 info
= IEEE80211_SKB_CB(skb
);
965 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
966 hdr
->frame_control
|= morefrags
;
968 * No multi-rate retries for fragmented frames, that
969 * would completely throw off the NAV at other STAs.
971 info
->control
.rates
[1].idx
= -1;
972 info
->control
.rates
[2].idx
= -1;
973 info
->control
.rates
[3].idx
= -1;
974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
975 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
977 hdr
->frame_control
&= ~morefrags
;
979 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
986 static ieee80211_tx_result debug_noinline
987 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
995 skb_queue_walk(&tx
->skbs
, skb
) {
996 ac
= skb_get_queue_mapping(skb
);
997 tx
->sta
->tx_bytes
[ac
] += skb
->len
;
1000 tx
->sta
->tx_packets
[ac
]++;
1005 static ieee80211_tx_result debug_noinline
1006 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1011 switch (tx
->key
->conf
.cipher
) {
1012 case WLAN_CIPHER_SUITE_WEP40
:
1013 case WLAN_CIPHER_SUITE_WEP104
:
1014 return ieee80211_crypto_wep_encrypt(tx
);
1015 case WLAN_CIPHER_SUITE_TKIP
:
1016 return ieee80211_crypto_tkip_encrypt(tx
);
1017 case WLAN_CIPHER_SUITE_CCMP
:
1018 return ieee80211_crypto_ccmp_encrypt(
1019 tx
, IEEE80211_CCMP_MIC_LEN
);
1020 case WLAN_CIPHER_SUITE_CCMP_256
:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1023 case WLAN_CIPHER_SUITE_AES_CMAC
:
1024 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1025 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1026 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1027 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1028 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1029 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1030 case WLAN_CIPHER_SUITE_GCMP
:
1031 case WLAN_CIPHER_SUITE_GCMP_256
:
1032 return ieee80211_crypto_gcmp_encrypt(tx
);
1034 return ieee80211_crypto_hw_encrypt(tx
);
1040 static ieee80211_tx_result debug_noinline
1041 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1043 struct sk_buff
*skb
;
1044 struct ieee80211_hdr
*hdr
;
1048 skb_queue_walk(&tx
->skbs
, skb
) {
1049 hdr
= (void *) skb
->data
;
1050 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1051 break; /* must not overwrite AID */
1052 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1053 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1054 next_len
= next
->len
;
1057 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1060 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1066 /* actual transmit path */
1068 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1069 struct sk_buff
*skb
,
1070 struct ieee80211_tx_info
*info
,
1071 struct tid_ampdu_tx
*tid_tx
,
1074 bool queued
= false;
1075 bool reset_agg_timer
= false;
1076 struct sk_buff
*purge_skb
= NULL
;
1078 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1079 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1080 reset_agg_timer
= true;
1081 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1083 * nothing -- this aggregation session is being started
1084 * but that might still fail with the driver
1086 } else if (!tx
->sta
->sta
.txq
[tid
]) {
1087 spin_lock(&tx
->sta
->lock
);
1089 * Need to re-check now, because we may get here
1091 * 1) in the window during which the setup is actually
1092 * already done, but not marked yet because not all
1093 * packets are spliced over to the driver pending
1094 * queue yet -- if this happened we acquire the lock
1095 * either before or after the splice happens, but
1096 * need to recheck which of these cases happened.
1098 * 2) during session teardown, if the OPERATIONAL bit
1099 * was cleared due to the teardown but the pointer
1100 * hasn't been assigned NULL yet (or we loaded it
1101 * before it was assigned) -- in this case it may
1102 * now be NULL which means we should just let the
1103 * packet pass through because splicing the frames
1104 * back is already done.
1106 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1109 /* do nothing, let packet pass through */
1110 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1111 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1112 reset_agg_timer
= true;
1115 info
->control
.vif
= &tx
->sdata
->vif
;
1116 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1117 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
|
1118 IEEE80211_TX_CTL_NO_PS_BUFFER
|
1119 IEEE80211_TX_STATUS_EOSP
;
1120 __skb_queue_tail(&tid_tx
->pending
, skb
);
1121 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1122 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1124 spin_unlock(&tx
->sta
->lock
);
1127 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1130 /* reset session timer */
1131 if (reset_agg_timer
&& tid_tx
->timeout
)
1132 tid_tx
->last_tx
= jiffies
;
1139 * pass %NULL for the station if unknown, a valid pointer if known
1140 * or an ERR_PTR() if the station is known not to exist
1142 static ieee80211_tx_result
1143 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1144 struct ieee80211_tx_data
*tx
,
1145 struct sta_info
*sta
, struct sk_buff
*skb
)
1147 struct ieee80211_local
*local
= sdata
->local
;
1148 struct ieee80211_hdr
*hdr
;
1149 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1153 memset(tx
, 0, sizeof(*tx
));
1157 __skb_queue_head_init(&tx
->skbs
);
1160 * If this flag is set to true anywhere, and we get here,
1161 * we are doing the needed processing, so remove the flag
1164 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1166 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1172 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1173 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1174 if (!tx
->sta
&& sdata
->wdev
.use_4addr
)
1176 } else if (info
->flags
& (IEEE80211_TX_INTFL_NL80211_FRAME_TX
|
1177 IEEE80211_TX_CTL_INJECTED
) ||
1178 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1179 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1181 if (!tx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
))
1182 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1185 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1186 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1187 ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
1188 !ieee80211_hw_check(&local
->hw
, TX_AMPDU_SETUP_IN_HW
)) {
1189 struct tid_ampdu_tx
*tid_tx
;
1191 qc
= ieee80211_get_qos_ctl(hdr
);
1192 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1194 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1198 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1201 if (unlikely(queued
))
1206 if (is_multicast_ether_addr(hdr
->addr1
)) {
1207 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1208 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1210 tx
->flags
|= IEEE80211_TX_UNICAST
;
1212 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1213 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1214 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1215 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1216 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1220 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1221 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1222 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1224 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1229 static void ieee80211_drv_tx(struct ieee80211_local
*local
,
1230 struct ieee80211_vif
*vif
,
1231 struct ieee80211_sta
*pubsta
,
1232 struct sk_buff
*skb
)
1234 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1235 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1236 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1237 struct ieee80211_tx_control control
= {
1240 struct ieee80211_txq
*txq
= NULL
;
1241 struct txq_info
*txqi
;
1244 if (info
->control
.flags
& IEEE80211_TX_CTRL_PS_RESPONSE
)
1247 if (!ieee80211_is_data(hdr
->frame_control
))
1251 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TID_MASK
;
1253 txq
= pubsta
->txq
[tid
];
1262 txqi
= to_txq_info(txq
);
1263 atomic_inc(&sdata
->txqs_len
[ac
]);
1264 if (atomic_read(&sdata
->txqs_len
[ac
]) >= local
->hw
.txq_ac_max_pending
)
1265 netif_stop_subqueue(sdata
->dev
, ac
);
1267 skb_queue_tail(&txqi
->queue
, skb
);
1268 drv_wake_tx_queue(local
, txqi
);
1273 drv_tx(local
, &control
, skb
);
1276 struct sk_buff
*ieee80211_tx_dequeue(struct ieee80211_hw
*hw
,
1277 struct ieee80211_txq
*txq
)
1279 struct ieee80211_local
*local
= hw_to_local(hw
);
1280 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(txq
->vif
);
1281 struct txq_info
*txqi
= container_of(txq
, struct txq_info
, txq
);
1282 struct ieee80211_hdr
*hdr
;
1283 struct sk_buff
*skb
= NULL
;
1286 spin_lock_bh(&txqi
->queue
.lock
);
1288 if (test_bit(IEEE80211_TXQ_STOP
, &txqi
->flags
))
1291 skb
= __skb_dequeue(&txqi
->queue
);
1295 atomic_dec(&sdata
->txqs_len
[ac
]);
1296 if (__netif_subqueue_stopped(sdata
->dev
, ac
))
1297 ieee80211_propagate_queue_wake(local
, sdata
->vif
.hw_queue
[ac
]);
1299 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1300 if (txq
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1301 struct sta_info
*sta
= container_of(txq
->sta
, struct sta_info
,
1303 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1305 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, txq
->tid
);
1306 if (test_bit(IEEE80211_TXQ_AMPDU
, &txqi
->flags
))
1307 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1309 info
->flags
&= ~IEEE80211_TX_CTL_AMPDU
;
1313 spin_unlock_bh(&txqi
->queue
.lock
);
1317 EXPORT_SYMBOL(ieee80211_tx_dequeue
);
1319 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1320 struct ieee80211_vif
*vif
,
1321 struct ieee80211_sta
*sta
,
1322 struct sk_buff_head
*skbs
,
1325 struct sk_buff
*skb
, *tmp
;
1326 unsigned long flags
;
1328 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1329 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1330 int q
= info
->hw_queue
;
1332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1333 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1334 __skb_unlink(skb
, skbs
);
1335 ieee80211_free_txskb(&local
->hw
, skb
);
1340 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1341 if (local
->queue_stop_reasons
[q
] ||
1342 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1343 if (unlikely(info
->flags
&
1344 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1345 if (local
->queue_stop_reasons
[q
] &
1346 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1348 * Drop off-channel frames if queues
1349 * are stopped for any reason other
1350 * than off-channel operation. Never
1353 spin_unlock_irqrestore(
1354 &local
->queue_stop_reason_lock
,
1356 ieee80211_purge_tx_queue(&local
->hw
,
1363 * Since queue is stopped, queue up frames for
1364 * later transmission from the tx-pending
1365 * tasklet when the queue is woken again.
1368 skb_queue_splice_init(skbs
,
1369 &local
->pending
[q
]);
1371 skb_queue_splice_tail_init(skbs
,
1372 &local
->pending
[q
]);
1374 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1379 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1381 info
->control
.vif
= vif
;
1383 __skb_unlink(skb
, skbs
);
1384 ieee80211_drv_tx(local
, vif
, sta
, skb
);
1391 * Returns false if the frame couldn't be transmitted but was queued instead.
1393 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1394 struct sk_buff_head
*skbs
, int led_len
,
1395 struct sta_info
*sta
, bool txpending
)
1397 struct ieee80211_tx_info
*info
;
1398 struct ieee80211_sub_if_data
*sdata
;
1399 struct ieee80211_vif
*vif
;
1400 struct ieee80211_sta
*pubsta
;
1401 struct sk_buff
*skb
;
1405 if (WARN_ON(skb_queue_empty(skbs
)))
1408 skb
= skb_peek(skbs
);
1409 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1410 info
= IEEE80211_SKB_CB(skb
);
1411 sdata
= vif_to_sdata(info
->control
.vif
);
1412 if (sta
&& !sta
->uploaded
)
1420 switch (sdata
->vif
.type
) {
1421 case NL80211_IFTYPE_MONITOR
:
1422 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1426 sdata
= rcu_dereference(local
->monitor_sdata
);
1430 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1431 } else if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
)) {
1437 case NL80211_IFTYPE_AP_VLAN
:
1438 sdata
= container_of(sdata
->bss
,
1439 struct ieee80211_sub_if_data
, u
.ap
);
1446 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1449 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1451 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1457 * Invoke TX handlers, return 0 on success and non-zero if the
1458 * frame was dropped or queued.
1460 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1462 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1463 ieee80211_tx_result res
= TX_DROP
;
1465 #define CALL_TXH(txh) \
1468 if (res != TX_CONTINUE) \
1472 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1473 CALL_TXH(ieee80211_tx_h_check_assoc
);
1474 CALL_TXH(ieee80211_tx_h_ps_buf
);
1475 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1476 CALL_TXH(ieee80211_tx_h_select_key
);
1477 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1478 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1480 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1481 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1486 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1487 CALL_TXH(ieee80211_tx_h_sequence
);
1488 CALL_TXH(ieee80211_tx_h_fragment
);
1489 /* handlers after fragment must be aware of tx info fragmentation! */
1490 CALL_TXH(ieee80211_tx_h_stats
);
1491 CALL_TXH(ieee80211_tx_h_encrypt
);
1492 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1493 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1497 if (unlikely(res
== TX_DROP
)) {
1498 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1500 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1502 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1504 } else if (unlikely(res
== TX_QUEUED
)) {
1505 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1512 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1513 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1514 int band
, struct ieee80211_sta
**sta
)
1516 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1517 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1518 struct ieee80211_tx_data tx
;
1519 struct sk_buff
*skb2
;
1521 if (ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
) == TX_DROP
)
1525 info
->control
.vif
= vif
;
1526 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1528 if (invoke_tx_handlers(&tx
))
1533 *sta
= &tx
.sta
->sta
;
1538 /* this function isn't suitable for fragmented data frames */
1539 skb2
= __skb_dequeue(&tx
.skbs
);
1540 if (WARN_ON(skb2
!= skb
|| !skb_queue_empty(&tx
.skbs
))) {
1541 ieee80211_free_txskb(hw
, skb2
);
1542 ieee80211_purge_tx_queue(hw
, &tx
.skbs
);
1548 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1551 * Returns false if the frame couldn't be transmitted but was queued instead.
1553 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1554 struct sta_info
*sta
, struct sk_buff
*skb
,
1557 struct ieee80211_local
*local
= sdata
->local
;
1558 struct ieee80211_tx_data tx
;
1559 ieee80211_tx_result res_prepare
;
1560 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1564 if (unlikely(skb
->len
< 10)) {
1569 /* initialises tx */
1571 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, sta
, skb
);
1573 if (unlikely(res_prepare
== TX_DROP
)) {
1574 ieee80211_free_txskb(&local
->hw
, skb
);
1576 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1580 /* set up hw_queue value early */
1581 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1582 !ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
1584 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1586 if (!invoke_tx_handlers(&tx
))
1587 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1593 /* device xmit handlers */
1595 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1596 struct sk_buff
*skb
,
1597 int head_need
, bool may_encrypt
)
1599 struct ieee80211_local
*local
= sdata
->local
;
1602 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1603 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1604 tail_need
-= skb_tailroom(skb
);
1605 tail_need
= max_t(int, tail_need
, 0);
1608 if (skb_cloned(skb
) &&
1609 (!ieee80211_hw_check(&local
->hw
, SUPPORTS_CLONED_SKBS
) ||
1610 !skb_clone_writable(skb
, ETH_HLEN
) ||
1611 (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
)))
1612 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1613 else if (head_need
|| tail_need
)
1614 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1618 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1619 wiphy_debug(local
->hw
.wiphy
,
1620 "failed to reallocate TX buffer\n");
1627 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1628 struct sta_info
*sta
, struct sk_buff
*skb
)
1630 struct ieee80211_local
*local
= sdata
->local
;
1631 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1632 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1636 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1638 headroom
= local
->tx_headroom
;
1640 headroom
+= sdata
->encrypt_headroom
;
1641 headroom
-= skb_headroom(skb
);
1642 headroom
= max_t(int, 0, headroom
);
1644 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1645 ieee80211_free_txskb(&local
->hw
, skb
);
1649 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1650 info
->control
.vif
= &sdata
->vif
;
1652 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1653 if (ieee80211_is_data(hdr
->frame_control
) &&
1654 is_unicast_ether_addr(hdr
->addr1
)) {
1655 if (mesh_nexthop_resolve(sdata
, skb
))
1656 return; /* skb queued: don't free */
1658 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1662 ieee80211_set_qos_hdr(sdata
, skb
);
1663 ieee80211_tx(sdata
, sta
, skb
, false);
1666 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1668 struct ieee80211_radiotap_iterator iterator
;
1669 struct ieee80211_radiotap_header
*rthdr
=
1670 (struct ieee80211_radiotap_header
*) skb
->data
;
1671 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1672 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1676 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1677 IEEE80211_TX_CTL_DONTFRAG
;
1680 * for every radiotap entry that is present
1681 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1682 * entries present, or -EINVAL on error)
1686 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1691 /* see if this argument is something we can use */
1692 switch (iterator
.this_arg_index
) {
1694 * You must take care when dereferencing iterator.this_arg
1695 * for multibyte types... the pointer is not aligned. Use
1696 * get_unaligned((type *)iterator.this_arg) to dereference
1697 * iterator.this_arg for type "type" safely on all arches.
1699 case IEEE80211_RADIOTAP_FLAGS
:
1700 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1702 * this indicates that the skb we have been
1703 * handed has the 32-bit FCS CRC at the end...
1704 * we should react to that by snipping it off
1705 * because it will be recomputed and added
1708 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1711 skb_trim(skb
, skb
->len
- FCS_LEN
);
1713 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1714 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1715 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1716 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1719 case IEEE80211_RADIOTAP_TX_FLAGS
:
1720 txflags
= get_unaligned_le16(iterator
.this_arg
);
1721 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1722 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1726 * Please update the file
1727 * Documentation/networking/mac80211-injection.txt
1728 * when parsing new fields here.
1736 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1740 * remove the radiotap header
1741 * iterator->_max_length was sanity-checked against
1742 * skb->len by iterator init
1744 skb_pull(skb
, iterator
._max_length
);
1749 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1750 struct net_device
*dev
)
1752 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1753 struct ieee80211_chanctx_conf
*chanctx_conf
;
1754 struct ieee80211_radiotap_header
*prthdr
=
1755 (struct ieee80211_radiotap_header
*)skb
->data
;
1756 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1757 struct ieee80211_hdr
*hdr
;
1758 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1759 struct cfg80211_chan_def
*chandef
;
1763 /* check for not even having the fixed radiotap header part */
1764 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1765 goto fail
; /* too short to be possibly valid */
1767 /* is it a header version we can trust to find length from? */
1768 if (unlikely(prthdr
->it_version
))
1769 goto fail
; /* only version 0 is supported */
1771 /* then there must be a radiotap header with a length we can use */
1772 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1774 /* does the skb contain enough to deliver on the alleged length? */
1775 if (unlikely(skb
->len
< len_rthdr
))
1776 goto fail
; /* skb too short for claimed rt header extent */
1779 * fix up the pointers accounting for the radiotap
1780 * header still being in there. We are being given
1781 * a precooked IEEE80211 header so no need for
1784 skb_set_mac_header(skb
, len_rthdr
);
1786 * these are just fixed to the end of the rt area since we
1787 * don't have any better information and at this point, nobody cares
1789 skb_set_network_header(skb
, len_rthdr
);
1790 skb_set_transport_header(skb
, len_rthdr
);
1792 if (skb
->len
< len_rthdr
+ 2)
1795 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1796 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1798 if (skb
->len
< len_rthdr
+ hdrlen
)
1802 * Initialize skb->protocol if the injected frame is a data frame
1803 * carrying a rfc1042 header
1805 if (ieee80211_is_data(hdr
->frame_control
) &&
1806 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1807 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1809 if (ether_addr_equal(payload
, rfc1042_header
))
1810 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1814 memset(info
, 0, sizeof(*info
));
1816 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1817 IEEE80211_TX_CTL_INJECTED
;
1819 /* process and remove the injection radiotap header */
1820 if (!ieee80211_parse_tx_radiotap(skb
))
1826 * We process outgoing injected frames that have a local address
1827 * we handle as though they are non-injected frames.
1828 * This code here isn't entirely correct, the local MAC address
1829 * isn't always enough to find the interface to use; for proper
1830 * VLAN/WDS support we will need a different mechanism (which
1831 * likely isn't going to be monitor interfaces).
1833 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1835 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1836 if (!ieee80211_sdata_running(tmp_sdata
))
1838 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1839 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1840 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1842 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1848 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1849 if (!chanctx_conf
) {
1850 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1853 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1857 chandef
= &chanctx_conf
->def
;
1858 else if (!local
->use_chanctx
)
1859 chandef
= &local
->_oper_chandef
;
1864 * Frame injection is not allowed if beaconing is not allowed
1865 * or if we need radar detection. Beaconing is usually not allowed when
1866 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1867 * Passive scan is also used in world regulatory domains where
1868 * your country is not known and as such it should be treated as
1869 * NO TX unless the channel is explicitly allowed in which case
1870 * your current regulatory domain would not have the passive scan
1873 * Since AP mode uses monitor interfaces to inject/TX management
1874 * frames we can make AP mode the exception to this rule once it
1875 * supports radar detection as its implementation can deal with
1876 * radar detection by itself. We can do that later by adding a
1877 * monitor flag interfaces used for AP support.
1879 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
1883 info
->band
= chandef
->chan
->band
;
1884 ieee80211_xmit(sdata
, NULL
, skb
);
1887 return NETDEV_TX_OK
;
1893 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1896 static inline bool ieee80211_is_tdls_setup(struct sk_buff
*skb
)
1898 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1900 return ethertype
== ETH_P_TDLS
&&
1902 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
1905 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data
*sdata
,
1906 struct sk_buff
*skb
,
1907 struct sta_info
**sta_out
)
1909 struct sta_info
*sta
;
1911 switch (sdata
->vif
.type
) {
1912 case NL80211_IFTYPE_AP_VLAN
:
1913 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1917 } else if (sdata
->wdev
.use_4addr
) {
1921 case NL80211_IFTYPE_AP
:
1922 case NL80211_IFTYPE_OCB
:
1923 case NL80211_IFTYPE_ADHOC
:
1924 if (is_multicast_ether_addr(skb
->data
)) {
1925 *sta_out
= ERR_PTR(-ENOENT
);
1928 sta
= sta_info_get_bss(sdata
, skb
->data
);
1930 case NL80211_IFTYPE_WDS
:
1931 sta
= sta_info_get(sdata
, sdata
->u
.wds
.remote_addr
);
1933 #ifdef CONFIG_MAC80211_MESH
1934 case NL80211_IFTYPE_MESH_POINT
:
1935 /* determined much later */
1939 case NL80211_IFTYPE_STATION
:
1940 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1941 sta
= sta_info_get(sdata
, skb
->data
);
1943 bool tdls_peer
, tdls_auth
;
1945 tdls_peer
= test_sta_flag(sta
,
1946 WLAN_STA_TDLS_PEER
);
1947 tdls_auth
= test_sta_flag(sta
,
1948 WLAN_STA_TDLS_PEER_AUTH
);
1950 if (tdls_peer
&& tdls_auth
) {
1956 * TDLS link during setup - throw out frames to
1957 * peer. Allow TDLS-setup frames to unauthorized
1958 * peers for the special case of a link teardown
1959 * after a TDLS sta is removed due to being
1962 if (tdls_peer
&& !tdls_auth
&&
1963 !ieee80211_is_tdls_setup(skb
))
1969 sta
= sta_info_get(sdata
, sdata
->u
.mgd
.bssid
);
1977 *sta_out
= sta
?: ERR_PTR(-ENOENT
);
1982 * ieee80211_build_hdr - build 802.11 header in the given frame
1983 * @sdata: virtual interface to build the header for
1984 * @skb: the skb to build the header in
1985 * @info_flags: skb flags to set
1987 * This function takes the skb with 802.3 header and reformats the header to
1988 * the appropriate IEEE 802.11 header based on which interface the packet is
1989 * being transmitted on.
1991 * Note that this function also takes care of the TX status request and
1992 * potential unsharing of the SKB - this needs to be interleaved with the
1995 * The function requires the read-side RCU lock held
1997 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1999 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
2000 struct sk_buff
*skb
, u32 info_flags
,
2001 struct sta_info
*sta
)
2003 struct ieee80211_local
*local
= sdata
->local
;
2004 struct ieee80211_tx_info
*info
;
2006 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
2008 struct ieee80211_hdr hdr
;
2009 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
2010 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
2011 const u8
*encaps_data
;
2012 int encaps_len
, skip_header_bytes
;
2014 bool wme_sta
= false, authorized
= false;
2018 struct ieee80211_chanctx_conf
*chanctx_conf
;
2019 struct ieee80211_sub_if_data
*ap_sdata
;
2020 enum ieee80211_band band
;
2026 /* convert Ethernet header to proper 802.11 header (based on
2027 * operation mode) */
2028 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2029 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2031 switch (sdata
->vif
.type
) {
2032 case NL80211_IFTYPE_AP_VLAN
:
2033 if (sdata
->wdev
.use_4addr
) {
2034 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2036 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
2037 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2038 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2039 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2041 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2042 wme_sta
= sta
->sta
.wme
;
2044 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2046 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
2047 if (!chanctx_conf
) {
2051 band
= chanctx_conf
->def
.chan
->band
;
2052 if (sdata
->wdev
.use_4addr
)
2055 case NL80211_IFTYPE_AP
:
2056 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2057 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2058 if (!chanctx_conf
) {
2062 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2064 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2065 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2066 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2068 band
= chanctx_conf
->def
.chan
->band
;
2070 case NL80211_IFTYPE_WDS
:
2071 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2073 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
2074 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2075 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2076 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2079 * This is the exception! WDS style interfaces are prohibited
2080 * when channel contexts are in used so this must be valid
2082 band
= local
->hw
.conf
.chandef
.chan
->band
;
2084 #ifdef CONFIG_MAC80211_MESH
2085 case NL80211_IFTYPE_MESH_POINT
:
2086 if (!is_multicast_ether_addr(skb
->data
)) {
2087 struct sta_info
*next_hop
;
2088 bool mpp_lookup
= true;
2090 mpath
= mesh_path_lookup(sdata
, skb
->data
);
2093 next_hop
= rcu_dereference(mpath
->next_hop
);
2095 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
2096 MESH_PATH_RESOLVING
)))
2101 mppath
= mpp_path_lookup(sdata
, skb
->data
);
2103 if (mppath
&& mpath
)
2104 mesh_path_del(mpath
->sdata
, mpath
->dst
);
2108 * Use address extension if it is a packet from
2109 * another interface or if we know the destination
2110 * is being proxied by a portal (i.e. portal address
2111 * differs from proxied address)
2113 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
2114 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
2115 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2116 skb
->data
, skb
->data
+ ETH_ALEN
);
2117 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
2120 /* DS -> MBSS (802.11-2012 13.11.3.3).
2121 * For unicast with unknown forwarding information,
2122 * destination might be in the MBSS or if that fails
2123 * forwarded to another mesh gate. In either case
2124 * resolution will be handled in ieee80211_xmit(), so
2125 * leave the original DA. This also works for mcast */
2126 const u8
*mesh_da
= skb
->data
;
2129 mesh_da
= mppath
->mpp
;
2131 mesh_da
= mpath
->dst
;
2133 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2134 mesh_da
, sdata
->vif
.addr
);
2135 if (is_multicast_ether_addr(mesh_da
))
2136 /* DA TA mSA AE:SA */
2137 meshhdrlen
= ieee80211_new_mesh_header(
2139 skb
->data
+ ETH_ALEN
, NULL
);
2141 /* RA TA mDA mSA AE:DA SA */
2142 meshhdrlen
= ieee80211_new_mesh_header(
2143 sdata
, &mesh_hdr
, skb
->data
,
2144 skb
->data
+ ETH_ALEN
);
2147 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2148 if (!chanctx_conf
) {
2152 band
= chanctx_conf
->def
.chan
->band
;
2155 case NL80211_IFTYPE_STATION
:
2156 /* we already did checks when looking up the RA STA */
2157 tdls_peer
= test_sta_flag(sta
, WLAN_STA_TDLS_PEER
);
2161 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2162 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2163 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2165 } else if (sdata
->u
.mgd
.use_4addr
&&
2166 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2167 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2168 IEEE80211_FCTL_TODS
);
2170 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2171 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2172 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2173 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2176 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2178 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2179 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2180 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2183 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2184 if (!chanctx_conf
) {
2188 band
= chanctx_conf
->def
.chan
->band
;
2190 case NL80211_IFTYPE_OCB
:
2192 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2193 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2194 eth_broadcast_addr(hdr
.addr3
);
2196 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2197 if (!chanctx_conf
) {
2201 band
= chanctx_conf
->def
.chan
->band
;
2203 case NL80211_IFTYPE_ADHOC
:
2205 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2206 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2207 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2209 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2210 if (!chanctx_conf
) {
2214 band
= chanctx_conf
->def
.chan
->band
;
2221 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2223 /* sta is always NULL for mesh */
2225 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2226 wme_sta
= sta
->sta
.wme
;
2227 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2228 /* For mesh, the use of the QoS header is mandatory */
2232 /* receiver does QoS (which also means we do) use it */
2234 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2239 * Drop unicast frames to unauthorised stations unless they are
2240 * EAPOL frames from the local station.
2242 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2243 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2244 !multicast
&& !authorized
&&
2245 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2246 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2247 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2248 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2249 sdata
->name
, hdr
.addr1
);
2252 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2258 if (unlikely(!multicast
&& skb
->sk
&&
2259 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2260 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2263 unsigned long flags
;
2266 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2267 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2268 1, 0x10000, GFP_ATOMIC
);
2269 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2273 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2281 * If the skb is shared we need to obtain our own copy.
2283 if (skb_shared(skb
)) {
2284 struct sk_buff
*tmp_skb
= skb
;
2286 /* can't happen -- skb is a clone if info_id != 0 */
2289 skb
= skb_clone(skb
, GFP_ATOMIC
);
2298 hdr
.frame_control
= fc
;
2299 hdr
.duration_id
= 0;
2302 skip_header_bytes
= ETH_HLEN
;
2303 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2304 encaps_data
= bridge_tunnel_header
;
2305 encaps_len
= sizeof(bridge_tunnel_header
);
2306 skip_header_bytes
-= 2;
2307 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2308 encaps_data
= rfc1042_header
;
2309 encaps_len
= sizeof(rfc1042_header
);
2310 skip_header_bytes
-= 2;
2316 nh_pos
= skb_network_header(skb
) - skb
->data
;
2317 h_pos
= skb_transport_header(skb
) - skb
->data
;
2319 skb_pull(skb
, skip_header_bytes
);
2320 nh_pos
-= skip_header_bytes
;
2321 h_pos
-= skip_header_bytes
;
2323 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2326 * So we need to modify the skb header and hence need a copy of
2327 * that. The head_need variable above doesn't, so far, include
2328 * the needed header space that we don't need right away. If we
2329 * can, then we don't reallocate right now but only after the
2330 * frame arrives at the master device (if it does...)
2332 * If we cannot, however, then we will reallocate to include all
2333 * the ever needed space. Also, if we need to reallocate it anyway,
2334 * make it big enough for everything we may ever need.
2337 if (head_need
> 0 || skb_cloned(skb
)) {
2338 head_need
+= sdata
->encrypt_headroom
;
2339 head_need
+= local
->tx_headroom
;
2340 head_need
= max_t(int, 0, head_need
);
2341 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2342 ieee80211_free_txskb(&local
->hw
, skb
);
2344 return ERR_PTR(-ENOMEM
);
2349 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2350 nh_pos
+= encaps_len
;
2351 h_pos
+= encaps_len
;
2354 #ifdef CONFIG_MAC80211_MESH
2355 if (meshhdrlen
> 0) {
2356 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2357 nh_pos
+= meshhdrlen
;
2358 h_pos
+= meshhdrlen
;
2362 if (ieee80211_is_data_qos(fc
)) {
2363 __le16
*qos_control
;
2365 qos_control
= (__le16
*) skb_push(skb
, 2);
2366 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2368 * Maybe we could actually set some fields here, for now just
2369 * initialise to zero to indicate no special operation.
2373 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2378 /* Update skb pointers to various headers since this modified frame
2379 * is going to go through Linux networking code that may potentially
2380 * need things like pointer to IP header. */
2381 skb_set_mac_header(skb
, 0);
2382 skb_set_network_header(skb
, nh_pos
);
2383 skb_set_transport_header(skb
, h_pos
);
2385 info
= IEEE80211_SKB_CB(skb
);
2386 memset(info
, 0, sizeof(*info
));
2388 info
->flags
= info_flags
;
2389 info
->ack_frame_id
= info_id
;
2395 return ERR_PTR(ret
);
2399 * fast-xmit overview
2401 * The core idea of this fast-xmit is to remove per-packet checks by checking
2402 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2403 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2404 * much less work can be done per packet. For example, fragmentation must be
2405 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2408 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2409 * header and other data to aid packet processing in ieee80211_xmit_fast().
2411 * The most difficult part of this is that when any of these assumptions
2412 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2413 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2414 * since the per-packet code no longer checks the conditions. This is reflected
2415 * by the calls to these functions throughout the rest of the code, and must be
2416 * maintained if any of the TX path checks change.
2419 void ieee80211_check_fast_xmit(struct sta_info
*sta
)
2421 struct ieee80211_fast_tx build
= {}, *fast_tx
= NULL
, *old
;
2422 struct ieee80211_local
*local
= sta
->local
;
2423 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
2424 struct ieee80211_hdr
*hdr
= (void *)build
.hdr
;
2425 struct ieee80211_chanctx_conf
*chanctx_conf
;
2428 if (!ieee80211_hw_check(&local
->hw
, SUPPORT_FAST_XMIT
))
2431 /* Locking here protects both the pointer itself, and against concurrent
2432 * invocations winning data access races to, e.g., the key pointer that
2434 * Without it, the invocation of this function right after the key
2435 * pointer changes wouldn't be sufficient, as another CPU could access
2436 * the pointer, then stall, and then do the cache update after the CPU
2437 * that invalidated the key.
2438 * With the locking, such scenarios cannot happen as the check for the
2439 * key and the fast-tx assignment are done atomically, so the CPU that
2440 * modifies the key will either wait or other one will see the key
2441 * cleared/changed already.
2443 spin_lock_bh(&sta
->lock
);
2444 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
2445 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2446 sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2449 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
2452 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
2453 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
2454 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
))
2457 if (sdata
->noack_map
)
2460 /* fast-xmit doesn't handle fragmentation at all */
2461 if (local
->hw
.wiphy
->frag_threshold
!= (u32
)-1 &&
2462 !local
->ops
->set_frag_threshold
)
2466 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2467 if (!chanctx_conf
) {
2471 build
.band
= chanctx_conf
->def
.chan
->band
;
2474 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2476 switch (sdata
->vif
.type
) {
2477 case NL80211_IFTYPE_ADHOC
:
2479 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2480 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2481 memcpy(hdr
->addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2484 case NL80211_IFTYPE_STATION
:
2485 if (test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2487 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2488 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2489 memcpy(hdr
->addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2494 if (sdata
->u
.mgd
.use_4addr
) {
2495 /* non-regular ethertype cannot use the fastpath */
2496 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2497 IEEE80211_FCTL_TODS
);
2499 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2500 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2501 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2502 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2506 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2508 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2509 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2510 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2513 case NL80211_IFTYPE_AP_VLAN
:
2514 if (sdata
->wdev
.use_4addr
) {
2515 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2516 IEEE80211_FCTL_TODS
);
2518 memcpy(hdr
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
2519 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2520 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2521 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2526 case NL80211_IFTYPE_AP
:
2527 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2529 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2530 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2531 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2535 /* not handled on fast-xmit */
2541 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2544 /* We store the key here so there's no point in using rcu_dereference()
2545 * but that's fine because the code that changes the pointers will call
2546 * this function after doing so. For a single CPU that would be enough,
2547 * for multiple see the comment above.
2549 build
.key
= rcu_access_pointer(sta
->ptk
[sta
->ptk_idx
]);
2551 build
.key
= rcu_access_pointer(sdata
->default_unicast_key
);
2553 bool gen_iv
, iv_spc
, mmic
;
2555 gen_iv
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
;
2556 iv_spc
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
;
2557 mmic
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
;
2559 /* don't handle software crypto */
2560 if (!(build
.key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
2563 switch (build
.key
->conf
.cipher
) {
2564 case WLAN_CIPHER_SUITE_CCMP
:
2565 case WLAN_CIPHER_SUITE_CCMP_256
:
2566 /* add fixed key ID */
2568 (build
.hdr
+ build
.hdr_len
)[3] =
2569 0x20 | (build
.key
->conf
.keyidx
<< 6);
2570 build
.pn_offs
= build
.hdr_len
;
2572 if (gen_iv
|| iv_spc
)
2573 build
.hdr_len
+= IEEE80211_CCMP_HDR_LEN
;
2575 case WLAN_CIPHER_SUITE_GCMP
:
2576 case WLAN_CIPHER_SUITE_GCMP_256
:
2577 /* add fixed key ID */
2579 (build
.hdr
+ build
.hdr_len
)[3] =
2580 0x20 | (build
.key
->conf
.keyidx
<< 6);
2581 build
.pn_offs
= build
.hdr_len
;
2583 if (gen_iv
|| iv_spc
)
2584 build
.hdr_len
+= IEEE80211_GCMP_HDR_LEN
;
2586 case WLAN_CIPHER_SUITE_TKIP
:
2587 /* cannot handle MMIC or IV generation in xmit-fast */
2591 build
.hdr_len
+= IEEE80211_TKIP_IV_LEN
;
2593 case WLAN_CIPHER_SUITE_WEP40
:
2594 case WLAN_CIPHER_SUITE_WEP104
:
2595 /* cannot handle IV generation in fast-xmit */
2599 build
.hdr_len
+= IEEE80211_WEP_IV_LEN
;
2601 case WLAN_CIPHER_SUITE_AES_CMAC
:
2602 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
2603 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
2604 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
2606 "management cipher suite 0x%x enabled for data\n",
2607 build
.key
->conf
.cipher
);
2610 /* we don't know how to generate IVs for this at all */
2611 if (WARN_ON(gen_iv
))
2613 /* pure hardware keys are OK, of course */
2614 if (!(build
.key
->flags
& KEY_FLAG_CIPHER_SCHEME
))
2616 /* cipher scheme might require space allocation */
2618 build
.key
->conf
.iv_len
> IEEE80211_FAST_XMIT_MAX_IV
)
2621 build
.hdr_len
+= build
.key
->conf
.iv_len
;
2624 fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
2627 hdr
->frame_control
= fc
;
2629 memcpy(build
.hdr
+ build
.hdr_len
,
2630 rfc1042_header
, sizeof(rfc1042_header
));
2631 build
.hdr_len
+= sizeof(rfc1042_header
);
2633 fast_tx
= kmemdup(&build
, sizeof(build
), GFP_ATOMIC
);
2634 /* if the kmemdup fails, continue w/o fast_tx */
2639 /* we might have raced against another call to this function */
2640 old
= rcu_dereference_protected(sta
->fast_tx
,
2641 lockdep_is_held(&sta
->lock
));
2642 rcu_assign_pointer(sta
->fast_tx
, fast_tx
);
2644 kfree_rcu(old
, rcu_head
);
2645 spin_unlock_bh(&sta
->lock
);
2648 void ieee80211_check_fast_xmit_all(struct ieee80211_local
*local
)
2650 struct sta_info
*sta
;
2653 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
2654 ieee80211_check_fast_xmit(sta
);
2658 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data
*sdata
)
2660 struct ieee80211_local
*local
= sdata
->local
;
2661 struct sta_info
*sta
;
2665 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
2666 if (sdata
!= sta
->sdata
&&
2667 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
2669 ieee80211_check_fast_xmit(sta
);
2675 void ieee80211_clear_fast_xmit(struct sta_info
*sta
)
2677 struct ieee80211_fast_tx
*fast_tx
;
2679 spin_lock_bh(&sta
->lock
);
2680 fast_tx
= rcu_dereference_protected(sta
->fast_tx
,
2681 lockdep_is_held(&sta
->lock
));
2682 RCU_INIT_POINTER(sta
->fast_tx
, NULL
);
2683 spin_unlock_bh(&sta
->lock
);
2686 kfree_rcu(fast_tx
, rcu_head
);
2689 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data
*sdata
,
2690 struct net_device
*dev
, struct sta_info
*sta
,
2691 struct ieee80211_fast_tx
*fast_tx
,
2692 struct sk_buff
*skb
)
2694 struct ieee80211_local
*local
= sdata
->local
;
2695 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2696 int extra_head
= fast_tx
->hdr_len
- (ETH_HLEN
- 2);
2697 int hw_headroom
= sdata
->local
->hw
.extra_tx_headroom
;
2699 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2700 struct ieee80211_hdr
*hdr
= (void *)fast_tx
->hdr
;
2701 struct ieee80211_tx_data tx
;
2702 ieee80211_tx_result r
;
2703 struct tid_ampdu_tx
*tid_tx
= NULL
;
2704 u8 tid
= IEEE80211_NUM_TIDS
;
2706 /* control port protocol needs a lot of special handling */
2707 if (cpu_to_be16(ethertype
) == sdata
->control_port_protocol
)
2710 /* only RFC 1042 SNAP */
2711 if (ethertype
< ETH_P_802_3_MIN
)
2714 /* don't handle TX status request here either */
2715 if (skb
->sk
&& skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)
2718 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
2719 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
2720 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
2722 if (!test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
))
2724 if (tid_tx
->timeout
)
2725 tid_tx
->last_tx
= jiffies
;
2729 /* after this point (skb is modified) we cannot return false */
2731 if (skb_shared(skb
)) {
2732 struct sk_buff
*tmp_skb
= skb
;
2734 skb
= skb_clone(skb
, GFP_ATOMIC
);
2741 ieee80211_tx_stats(dev
, skb
->len
+ extra_head
);
2743 /* will not be crypto-handled beyond what we do here, so use false
2744 * as the may-encrypt argument for the resize to not account for
2745 * more room than we already have in 'extra_head'
2747 if (unlikely(ieee80211_skb_resize(sdata
, skb
,
2748 max_t(int, extra_head
+ hw_headroom
-
2749 skb_headroom(skb
), 0),
2755 memcpy(ð
, skb
->data
, ETH_HLEN
- 2);
2756 hdr
= (void *)skb_push(skb
, extra_head
);
2757 memcpy(skb
->data
, fast_tx
->hdr
, fast_tx
->hdr_len
);
2758 memcpy(skb
->data
+ fast_tx
->da_offs
, eth
.h_dest
, ETH_ALEN
);
2759 memcpy(skb
->data
+ fast_tx
->sa_offs
, eth
.h_source
, ETH_ALEN
);
2761 memset(info
, 0, sizeof(*info
));
2762 info
->band
= fast_tx
->band
;
2763 info
->control
.vif
= &sdata
->vif
;
2764 info
->flags
= IEEE80211_TX_CTL_FIRST_FRAGMENT
|
2765 IEEE80211_TX_CTL_DONTFRAG
|
2766 (tid_tx
? IEEE80211_TX_CTL_AMPDU
: 0);
2768 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
2769 *ieee80211_get_qos_ctl(hdr
) = tid
;
2770 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, tid
);
2772 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2773 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence_number
);
2774 sdata
->sequence_number
+= 0x10;
2777 if (skb_shinfo(skb
)->gso_size
)
2778 sta
->tx_msdu
[tid
] +=
2779 DIV_ROUND_UP(skb
->len
, skb_shinfo(skb
)->gso_size
);
2781 sta
->tx_msdu
[tid
]++;
2783 info
->hw_queue
= sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
2785 __skb_queue_head_init(&tx
.skbs
);
2787 tx
.flags
= IEEE80211_TX_UNICAST
;
2791 tx
.key
= fast_tx
->key
;
2794 info
->control
.hw_key
= &fast_tx
->key
->conf
;
2796 if (!ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
2798 r
= ieee80211_tx_h_rate_ctrl(&tx
);
2802 if (r
!= TX_CONTINUE
) {
2809 /* statistics normally done by ieee80211_tx_h_stats (but that
2810 * has to consider fragmentation, so is more complex)
2812 sta
->tx_bytes
[skb_get_queue_mapping(skb
)] += skb
->len
;
2813 sta
->tx_packets
[skb_get_queue_mapping(skb
)]++;
2815 if (fast_tx
->pn_offs
) {
2817 u8
*crypto_hdr
= skb
->data
+ fast_tx
->pn_offs
;
2819 switch (fast_tx
->key
->conf
.cipher
) {
2820 case WLAN_CIPHER_SUITE_CCMP
:
2821 case WLAN_CIPHER_SUITE_CCMP_256
:
2822 case WLAN_CIPHER_SUITE_GCMP
:
2823 case WLAN_CIPHER_SUITE_GCMP_256
:
2824 pn
= atomic64_inc_return(&fast_tx
->key
->conf
.tx_pn
);
2826 crypto_hdr
[1] = pn
>> 8;
2827 crypto_hdr
[4] = pn
>> 16;
2828 crypto_hdr
[5] = pn
>> 24;
2829 crypto_hdr
[6] = pn
>> 32;
2830 crypto_hdr
[7] = pn
>> 40;
2835 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2836 sdata
= container_of(sdata
->bss
,
2837 struct ieee80211_sub_if_data
, u
.ap
);
2839 __skb_queue_tail(&tx
.skbs
, skb
);
2840 ieee80211_tx_frags(local
, &sdata
->vif
, &sta
->sta
, &tx
.skbs
, false);
2844 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2845 struct net_device
*dev
,
2848 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2849 struct sta_info
*sta
;
2850 struct sk_buff
*next
;
2852 if (unlikely(skb
->len
< ETH_HLEN
)) {
2859 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
))
2862 if (!IS_ERR_OR_NULL(sta
)) {
2863 struct ieee80211_fast_tx
*fast_tx
;
2865 fast_tx
= rcu_dereference(sta
->fast_tx
);
2868 ieee80211_xmit_fast(sdata
, dev
, sta
, fast_tx
, skb
))
2872 if (skb_is_gso(skb
)) {
2873 struct sk_buff
*segs
;
2875 segs
= skb_gso_segment(skb
, 0);
2883 /* we cannot process non-linear frames on this path */
2884 if (skb_linearize(skb
)) {
2889 /* the frame could be fragmented, software-encrypted, and other
2890 * things so we cannot really handle checksum offload with it -
2891 * fix it up in software before we handle anything else.
2893 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2894 skb_set_transport_header(skb
,
2895 skb_checksum_start_offset(skb
));
2896 if (skb_checksum_help(skb
))
2909 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
2913 ieee80211_tx_stats(dev
, skb
->len
);
2915 ieee80211_xmit(sdata
, sta
, skb
);
2925 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2926 * @skb: packet to be sent
2927 * @dev: incoming interface
2929 * On failure skb will be freed.
2931 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2932 struct net_device
*dev
)
2934 __ieee80211_subif_start_xmit(skb
, dev
, 0);
2935 return NETDEV_TX_OK
;
2939 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
2940 struct sk_buff
*skb
, u32 info_flags
)
2942 struct ieee80211_hdr
*hdr
;
2943 struct ieee80211_tx_data tx
= {
2944 .local
= sdata
->local
,
2947 struct sta_info
*sta
;
2951 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
)) {
2953 skb
= ERR_PTR(-EINVAL
);
2957 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
2961 hdr
= (void *)skb
->data
;
2962 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
2965 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
2968 return ERR_PTR(-EINVAL
);
2977 * ieee80211_clear_tx_pending may not be called in a context where
2978 * it is possible that it packets could come in again.
2980 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2982 struct sk_buff
*skb
;
2985 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2986 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
2987 ieee80211_free_txskb(&local
->hw
, skb
);
2992 * Returns false if the frame couldn't be transmitted but was queued instead,
2993 * which in this case means re-queued -- take as an indication to stop sending
2994 * more pending frames.
2996 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2997 struct sk_buff
*skb
)
2999 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3000 struct ieee80211_sub_if_data
*sdata
;
3001 struct sta_info
*sta
;
3002 struct ieee80211_hdr
*hdr
;
3004 struct ieee80211_chanctx_conf
*chanctx_conf
;
3006 sdata
= vif_to_sdata(info
->control
.vif
);
3008 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
3009 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3010 if (unlikely(!chanctx_conf
)) {
3014 info
->band
= chanctx_conf
->def
.chan
->band
;
3015 result
= ieee80211_tx(sdata
, NULL
, skb
, true);
3017 struct sk_buff_head skbs
;
3019 __skb_queue_head_init(&skbs
);
3020 __skb_queue_tail(&skbs
, skb
);
3022 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3023 sta
= sta_info_get(sdata
, hdr
->addr1
);
3025 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
3032 * Transmit all pending packets. Called from tasklet.
3034 void ieee80211_tx_pending(unsigned long data
)
3036 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
3037 unsigned long flags
;
3043 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
3044 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3046 * If queue is stopped by something other than due to pending
3047 * frames, or we have no pending frames, proceed to next queue.
3049 if (local
->queue_stop_reasons
[i
] ||
3050 skb_queue_empty(&local
->pending
[i
]))
3053 while (!skb_queue_empty(&local
->pending
[i
])) {
3054 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
3055 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3057 if (WARN_ON(!info
->control
.vif
)) {
3058 ieee80211_free_txskb(&local
->hw
, skb
);
3062 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
3065 txok
= ieee80211_tx_pending_skb(local
, skb
);
3066 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
3072 if (skb_queue_empty(&local
->pending
[i
]))
3073 ieee80211_propagate_queue_wake(local
, i
);
3075 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
3080 /* functions for drivers to get certain frames */
3082 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3083 struct ps_data
*ps
, struct sk_buff
*skb
,
3088 int i
, have_bits
= 0, n1
, n2
;
3090 /* Generate bitmap for TIM only if there are any STAs in power save
3092 if (atomic_read(&ps
->num_sta_ps
) > 0)
3093 /* in the hope that this is faster than
3094 * checking byte-for-byte */
3095 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
3096 IEEE80211_MAX_AID
+1);
3098 if (ps
->dtim_count
== 0)
3099 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
3104 tim
= pos
= (u8
*) skb_put(skb
, 6);
3105 *pos
++ = WLAN_EID_TIM
;
3107 *pos
++ = ps
->dtim_count
;
3108 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
3110 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
3113 ps
->dtim_bc_mc
= aid0
== 1;
3116 /* Find largest even number N1 so that bits numbered 1 through
3117 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3118 * (N2 + 1) x 8 through 2007 are 0. */
3120 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
3127 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
3134 /* Bitmap control */
3136 /* Part Virt Bitmap */
3137 skb_put(skb
, n2
- n1
);
3138 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
3140 tim
[1] = n2
- n1
+ 4;
3142 *pos
++ = aid0
; /* Bitmap control */
3143 *pos
++ = 0; /* Part Virt Bitmap */
3147 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3148 struct ps_data
*ps
, struct sk_buff
*skb
,
3151 struct ieee80211_local
*local
= sdata
->local
;
3154 * Not very nice, but we want to allow the driver to call
3155 * ieee80211_beacon_get() as a response to the set_tim()
3156 * callback. That, however, is already invoked under the
3157 * sta_lock to guarantee consistent and race-free update
3158 * of the tim bitmap in mac80211 and the driver.
3160 if (local
->tim_in_locked_section
) {
3161 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3163 spin_lock_bh(&local
->tim_lock
);
3164 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3165 spin_unlock_bh(&local
->tim_lock
);
3171 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
3172 struct beacon_data
*beacon
)
3174 struct probe_resp
*resp
;
3176 size_t beacon_data_len
;
3178 u8 count
= beacon
->csa_current_counter
;
3180 switch (sdata
->vif
.type
) {
3181 case NL80211_IFTYPE_AP
:
3182 beacon_data
= beacon
->tail
;
3183 beacon_data_len
= beacon
->tail_len
;
3185 case NL80211_IFTYPE_ADHOC
:
3186 beacon_data
= beacon
->head
;
3187 beacon_data_len
= beacon
->head_len
;
3189 case NL80211_IFTYPE_MESH_POINT
:
3190 beacon_data
= beacon
->head
;
3191 beacon_data_len
= beacon
->head_len
;
3198 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
3199 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
3201 if (beacon
->csa_counter_offsets
[i
]) {
3202 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
3208 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
3211 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
3212 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
3217 static u8
__ieee80211_csa_update_counter(struct beacon_data
*beacon
)
3219 beacon
->csa_current_counter
--;
3221 /* the counter should never reach 0 */
3222 WARN_ON_ONCE(!beacon
->csa_current_counter
);
3224 return beacon
->csa_current_counter
;
3227 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
3229 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3230 struct beacon_data
*beacon
= NULL
;
3235 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3236 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
3237 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
3238 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
3239 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
3240 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
3245 count
= __ieee80211_csa_update_counter(beacon
);
3251 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
3253 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
3255 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3256 struct beacon_data
*beacon
= NULL
;
3258 size_t beacon_data_len
;
3261 if (!ieee80211_sdata_running(sdata
))
3265 if (vif
->type
== NL80211_IFTYPE_AP
) {
3266 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3268 beacon
= rcu_dereference(ap
->beacon
);
3269 if (WARN_ON(!beacon
|| !beacon
->tail
))
3271 beacon_data
= beacon
->tail
;
3272 beacon_data_len
= beacon
->tail_len
;
3273 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
3274 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3276 beacon
= rcu_dereference(ifibss
->presp
);
3280 beacon_data
= beacon
->head
;
3281 beacon_data_len
= beacon
->head_len
;
3282 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
3283 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3285 beacon
= rcu_dereference(ifmsh
->beacon
);
3289 beacon_data
= beacon
->head
;
3290 beacon_data_len
= beacon
->head_len
;
3296 if (!beacon
->csa_counter_offsets
[0])
3299 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
3302 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
3309 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
3311 static struct sk_buff
*
3312 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
3313 struct ieee80211_vif
*vif
,
3314 struct ieee80211_mutable_offsets
*offs
,
3317 struct ieee80211_local
*local
= hw_to_local(hw
);
3318 struct beacon_data
*beacon
= NULL
;
3319 struct sk_buff
*skb
= NULL
;
3320 struct ieee80211_tx_info
*info
;
3321 struct ieee80211_sub_if_data
*sdata
= NULL
;
3322 enum ieee80211_band band
;
3323 struct ieee80211_tx_rate_control txrc
;
3324 struct ieee80211_chanctx_conf
*chanctx_conf
;
3325 int csa_off_base
= 0;
3329 sdata
= vif_to_sdata(vif
);
3330 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3332 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
3336 memset(offs
, 0, sizeof(*offs
));
3338 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3339 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3341 beacon
= rcu_dereference(ap
->beacon
);
3343 if (beacon
->csa_counter_offsets
[0]) {
3345 __ieee80211_csa_update_counter(beacon
);
3347 ieee80211_set_csa(sdata
, beacon
);
3351 * headroom, head length,
3352 * tail length and maximum TIM length
3354 skb
= dev_alloc_skb(local
->tx_headroom
+
3356 beacon
->tail_len
+ 256 +
3357 local
->hw
.extra_beacon_tailroom
);
3361 skb_reserve(skb
, local
->tx_headroom
);
3362 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3365 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
3369 offs
->tim_offset
= beacon
->head_len
;
3370 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3372 /* for AP the csa offsets are from tail */
3373 csa_off_base
= skb
->len
;
3377 memcpy(skb_put(skb
, beacon
->tail_len
),
3378 beacon
->tail
, beacon
->tail_len
);
3381 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
3382 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3383 struct ieee80211_hdr
*hdr
;
3385 beacon
= rcu_dereference(ifibss
->presp
);
3389 if (beacon
->csa_counter_offsets
[0]) {
3391 __ieee80211_csa_update_counter(beacon
);
3393 ieee80211_set_csa(sdata
, beacon
);
3396 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
3397 local
->hw
.extra_beacon_tailroom
);
3400 skb_reserve(skb
, local
->tx_headroom
);
3401 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3404 hdr
= (struct ieee80211_hdr
*) skb
->data
;
3405 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3406 IEEE80211_STYPE_BEACON
);
3407 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3408 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3410 beacon
= rcu_dereference(ifmsh
->beacon
);
3414 if (beacon
->csa_counter_offsets
[0]) {
3416 /* TODO: For mesh csa_counter is in TU, so
3417 * decrementing it by one isn't correct, but
3418 * for now we leave it consistent with overall
3419 * mac80211's behavior.
3421 __ieee80211_csa_update_counter(beacon
);
3423 ieee80211_set_csa(sdata
, beacon
);
3426 if (ifmsh
->sync_ops
)
3427 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
3429 skb
= dev_alloc_skb(local
->tx_headroom
+
3433 local
->hw
.extra_beacon_tailroom
);
3436 skb_reserve(skb
, local
->tx_headroom
);
3437 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3439 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
3442 offs
->tim_offset
= beacon
->head_len
;
3443 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3446 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
3454 if (offs
&& beacon
) {
3457 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
3458 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
3463 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
3467 band
= chanctx_conf
->def
.chan
->band
;
3469 info
= IEEE80211_SKB_CB(skb
);
3471 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
3472 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
3475 memset(&txrc
, 0, sizeof(txrc
));
3477 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
3478 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
3480 txrc
.reported_rate
.idx
= -1;
3481 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
3482 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
3483 txrc
.max_rate_idx
= -1;
3485 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
3487 rate_control_get_rate(sdata
, NULL
, &txrc
);
3489 info
->control
.vif
= vif
;
3491 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
3492 IEEE80211_TX_CTL_ASSIGN_SEQ
|
3493 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
3501 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
3502 struct ieee80211_vif
*vif
,
3503 struct ieee80211_mutable_offsets
*offs
)
3505 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
3507 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
3509 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
3510 struct ieee80211_vif
*vif
,
3511 u16
*tim_offset
, u16
*tim_length
)
3513 struct ieee80211_mutable_offsets offs
= {};
3514 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
3517 *tim_offset
= offs
.tim_offset
;
3520 *tim_length
= offs
.tim_length
;
3524 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
3526 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
3527 struct ieee80211_vif
*vif
)
3529 struct ieee80211_if_ap
*ap
= NULL
;
3530 struct sk_buff
*skb
= NULL
;
3531 struct probe_resp
*presp
= NULL
;
3532 struct ieee80211_hdr
*hdr
;
3533 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3535 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
3541 presp
= rcu_dereference(ap
->probe_resp
);
3545 skb
= dev_alloc_skb(presp
->len
);
3549 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
3551 hdr
= (struct ieee80211_hdr
*) skb
->data
;
3552 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
3558 EXPORT_SYMBOL(ieee80211_proberesp_get
);
3560 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
3561 struct ieee80211_vif
*vif
)
3563 struct ieee80211_sub_if_data
*sdata
;
3564 struct ieee80211_if_managed
*ifmgd
;
3565 struct ieee80211_pspoll
*pspoll
;
3566 struct ieee80211_local
*local
;
3567 struct sk_buff
*skb
;
3569 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
3572 sdata
= vif_to_sdata(vif
);
3573 ifmgd
= &sdata
->u
.mgd
;
3574 local
= sdata
->local
;
3576 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
3580 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3582 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
3583 memset(pspoll
, 0, sizeof(*pspoll
));
3584 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
3585 IEEE80211_STYPE_PSPOLL
);
3586 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
3588 /* aid in PS-Poll has its two MSBs each set to 1 */
3589 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
3591 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
3592 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
3596 EXPORT_SYMBOL(ieee80211_pspoll_get
);
3598 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
3599 struct ieee80211_vif
*vif
)
3601 struct ieee80211_hdr_3addr
*nullfunc
;
3602 struct ieee80211_sub_if_data
*sdata
;
3603 struct ieee80211_if_managed
*ifmgd
;
3604 struct ieee80211_local
*local
;
3605 struct sk_buff
*skb
;
3607 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
3610 sdata
= vif_to_sdata(vif
);
3611 ifmgd
= &sdata
->u
.mgd
;
3612 local
= sdata
->local
;
3614 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
3618 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3620 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
3622 memset(nullfunc
, 0, sizeof(*nullfunc
));
3623 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
3624 IEEE80211_STYPE_NULLFUNC
|
3625 IEEE80211_FCTL_TODS
);
3626 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
3627 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
3628 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
3632 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
3634 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
3636 const u8
*ssid
, size_t ssid_len
,
3639 struct ieee80211_local
*local
= hw_to_local(hw
);
3640 struct ieee80211_hdr_3addr
*hdr
;
3641 struct sk_buff
*skb
;
3645 ie_ssid_len
= 2 + ssid_len
;
3647 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
3648 ie_ssid_len
+ tailroom
);
3652 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3654 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
3655 memset(hdr
, 0, sizeof(*hdr
));
3656 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3657 IEEE80211_STYPE_PROBE_REQ
);
3658 eth_broadcast_addr(hdr
->addr1
);
3659 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
3660 eth_broadcast_addr(hdr
->addr3
);
3662 pos
= skb_put(skb
, ie_ssid_len
);
3663 *pos
++ = WLAN_EID_SSID
;
3666 memcpy(pos
, ssid
, ssid_len
);
3671 EXPORT_SYMBOL(ieee80211_probereq_get
);
3673 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3674 const void *frame
, size_t frame_len
,
3675 const struct ieee80211_tx_info
*frame_txctl
,
3676 struct ieee80211_rts
*rts
)
3678 const struct ieee80211_hdr
*hdr
= frame
;
3680 rts
->frame_control
=
3681 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
3682 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
3684 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
3685 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
3687 EXPORT_SYMBOL(ieee80211_rts_get
);
3689 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3690 const void *frame
, size_t frame_len
,
3691 const struct ieee80211_tx_info
*frame_txctl
,
3692 struct ieee80211_cts
*cts
)
3694 const struct ieee80211_hdr
*hdr
= frame
;
3696 cts
->frame_control
=
3697 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
3698 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
3699 frame_len
, frame_txctl
);
3700 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
3702 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
3705 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
3706 struct ieee80211_vif
*vif
)
3708 struct ieee80211_local
*local
= hw_to_local(hw
);
3709 struct sk_buff
*skb
= NULL
;
3710 struct ieee80211_tx_data tx
;
3711 struct ieee80211_sub_if_data
*sdata
;
3713 struct ieee80211_tx_info
*info
;
3714 struct ieee80211_chanctx_conf
*chanctx_conf
;
3716 sdata
= vif_to_sdata(vif
);
3719 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3724 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3725 struct beacon_data
*beacon
=
3726 rcu_dereference(sdata
->u
.ap
.beacon
);
3728 if (!beacon
|| !beacon
->head
)
3731 ps
= &sdata
->u
.ap
.ps
;
3732 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3733 ps
= &sdata
->u
.mesh
.ps
;
3738 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
3739 goto out
; /* send buffered bc/mc only after DTIM beacon */
3742 skb
= skb_dequeue(&ps
->bc_buf
);
3745 local
->total_ps_buffered
--;
3747 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
3748 struct ieee80211_hdr
*hdr
=
3749 (struct ieee80211_hdr
*) skb
->data
;
3750 /* more buffered multicast/broadcast frames ==> set
3751 * MoreData flag in IEEE 802.11 header to inform PS
3753 hdr
->frame_control
|=
3754 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
3757 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3758 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
3759 if (!ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
))
3761 dev_kfree_skb_any(skb
);
3764 info
= IEEE80211_SKB_CB(skb
);
3766 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
3767 info
->band
= chanctx_conf
->def
.chan
->band
;
3769 if (invoke_tx_handlers(&tx
))
3776 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
3778 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3780 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3781 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3782 struct ieee80211_local
*local
= sdata
->local
;
3786 lockdep_assert_held(&local
->sta_mtx
);
3788 /* only some cases are supported right now */
3789 switch (sdata
->vif
.type
) {
3790 case NL80211_IFTYPE_STATION
:
3791 case NL80211_IFTYPE_AP
:
3792 case NL80211_IFTYPE_AP_VLAN
:
3799 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
3802 if (sta
->reserved_tid
== tid
) {
3807 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
3808 sdata_err(sdata
, "TID reservation already active\n");
3813 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
3814 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3818 /* Tear down BA sessions so we stop aggregating on this TID */
3819 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
)) {
3820 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3821 __ieee80211_stop_tx_ba_session(sta
, tid
,
3822 AGG_STOP_LOCAL_REQUEST
);
3825 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
3826 __ieee80211_flush_queues(local
, sdata
, queues
, false);
3828 sta
->reserved_tid
= tid
;
3830 ieee80211_wake_vif_queues(local
, sdata
,
3831 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3833 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
))
3834 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3840 EXPORT_SYMBOL(ieee80211_reserve_tid
);
3842 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3844 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3845 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3847 lockdep_assert_held(&sdata
->local
->sta_mtx
);
3849 /* only some cases are supported right now */
3850 switch (sdata
->vif
.type
) {
3851 case NL80211_IFTYPE_STATION
:
3852 case NL80211_IFTYPE_AP
:
3853 case NL80211_IFTYPE_AP_VLAN
:
3860 if (tid
!= sta
->reserved_tid
) {
3861 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
3865 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
3867 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
3869 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
3870 struct sk_buff
*skb
, int tid
,
3871 enum ieee80211_band band
)
3873 int ac
= ieee802_1d_to_ac
[tid
& 7];
3875 skb_set_mac_header(skb
, 0);
3876 skb_set_network_header(skb
, 0);
3877 skb_set_transport_header(skb
, 0);
3879 skb_set_queue_mapping(skb
, ac
);
3880 skb
->priority
= tid
;
3882 skb
->dev
= sdata
->dev
;
3885 * The other path calling ieee80211_xmit is from the tasklet,
3886 * and while we can handle concurrent transmissions locking
3887 * requirements are that we do not come into tx with bhs on.
3890 IEEE80211_SKB_CB(skb
)->band
= band
;
3891 ieee80211_xmit(sdata
, NULL
, skb
);