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
;
713 /* don't ask rate control when rate already injected via radiotap */
714 if (info
->control
.flags
& IEEE80211_TX_CTRL_RATE_INJECT
)
718 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
724 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
725 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
729 tx
->sdata
->name
, hdr
->addr1
,
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
737 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
739 if (tx
->sta
&& !info
->control
.skip_table
)
740 ratetbl
= rcu_dereference(tx
->sta
->sta
.rates
);
742 if (unlikely(info
->control
.rates
[0].idx
< 0)) {
744 struct ieee80211_tx_rate rate
= {
745 .idx
= ratetbl
->rate
[0].idx
,
746 .flags
= ratetbl
->rate
[0].flags
,
747 .count
= ratetbl
->rate
[0].count
750 if (ratetbl
->rate
[0].idx
< 0)
758 tx
->rate
= info
->control
.rates
[0];
761 if (txrc
.reported_rate
.idx
< 0) {
762 txrc
.reported_rate
= tx
->rate
;
763 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
764 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
766 tx
->sta
->tx_stats
.last_rate
= txrc
.reported_rate
;
771 if (unlikely(!info
->control
.rates
[0].count
))
772 info
->control
.rates
[0].count
= 1;
774 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
775 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
776 info
->control
.rates
[0].count
= 1;
781 static __le16
ieee80211_tx_next_seq(struct sta_info
*sta
, int tid
)
783 u16
*seq
= &sta
->tid_seq
[tid
];
784 __le16 ret
= cpu_to_le16(*seq
);
786 /* Increase the sequence number. */
787 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
792 static ieee80211_tx_result debug_noinline
793 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
795 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
796 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
805 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
808 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
811 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
814 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
823 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
824 is_multicast_ether_addr(hdr
->addr1
)) {
825 /* driver should assign sequence number */
826 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
827 /* for pure STA mode without beacons, we can do it */
828 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
829 tx
->sdata
->sequence_number
+= 0x10;
831 tx
->sta
->tx_stats
.msdu
[IEEE80211_NUM_TIDS
]++;
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
843 /* include per-STA, per-TID sequence counter */
845 qc
= ieee80211_get_qos_ctl(hdr
);
846 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
847 tx
->sta
->tx_stats
.msdu
[tid
]++;
849 if (!tx
->sta
->sta
.txq
[0])
850 hdr
->seq_ctrl
= ieee80211_tx_next_seq(tx
->sta
, tid
);
855 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
856 struct sk_buff
*skb
, int hdrlen
,
859 struct ieee80211_local
*local
= tx
->local
;
860 struct ieee80211_tx_info
*info
;
862 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
863 int pos
= hdrlen
+ per_fragm
;
864 int rem
= skb
->len
- hdrlen
- per_fragm
;
866 if (WARN_ON(rem
< 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen
= per_fragm
;
877 tmp
= dev_alloc_skb(local
->tx_headroom
+
879 tx
->sdata
->encrypt_headroom
+
880 IEEE80211_ENCRYPT_TAILROOM
);
884 __skb_queue_tail(&tx
->skbs
, tmp
);
887 local
->tx_headroom
+ tx
->sdata
->encrypt_headroom
);
889 /* copy control information */
890 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
892 info
= IEEE80211_SKB_CB(tmp
);
893 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
894 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
897 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
899 skb_copy_queue_mapping(tmp
, skb
);
900 tmp
->priority
= skb
->priority
;
903 /* copy header and data */
904 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
905 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
910 /* adjust first fragment's length */
911 skb_trim(skb
, hdrlen
+ per_fragm
);
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
918 struct sk_buff
*skb
= tx
->skb
;
919 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
920 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
921 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx
->skbs
, skb
);
929 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
932 if (tx
->local
->ops
->set_frag_threshold
)
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
940 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
943 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
957 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
960 /* update duration/seq/flags of fragments */
963 skb_queue_walk(&tx
->skbs
, skb
) {
964 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
966 hdr
= (void *)skb
->data
;
967 info
= IEEE80211_SKB_CB(skb
);
969 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
970 hdr
->frame_control
|= morefrags
;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info
->control
.rates
[1].idx
= -1;
976 info
->control
.rates
[2].idx
= -1;
977 info
->control
.rates
[3].idx
= -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
979 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
981 hdr
->frame_control
&= ~morefrags
;
983 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
999 skb_queue_walk(&tx
->skbs
, skb
) {
1000 ac
= skb_get_queue_mapping(skb
);
1001 tx
->sta
->tx_stats
.bytes
[ac
] += skb
->len
;
1004 tx
->sta
->tx_stats
.packets
[ac
]++;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1015 switch (tx
->key
->conf
.cipher
) {
1016 case WLAN_CIPHER_SUITE_WEP40
:
1017 case WLAN_CIPHER_SUITE_WEP104
:
1018 return ieee80211_crypto_wep_encrypt(tx
);
1019 case WLAN_CIPHER_SUITE_TKIP
:
1020 return ieee80211_crypto_tkip_encrypt(tx
);
1021 case WLAN_CIPHER_SUITE_CCMP
:
1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx
, IEEE80211_CCMP_MIC_LEN
);
1024 case WLAN_CIPHER_SUITE_CCMP_256
:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx
, IEEE80211_CCMP_256_MIC_LEN
);
1027 case WLAN_CIPHER_SUITE_AES_CMAC
:
1028 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx
);
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx
);
1034 case WLAN_CIPHER_SUITE_GCMP
:
1035 case WLAN_CIPHER_SUITE_GCMP_256
:
1036 return ieee80211_crypto_gcmp_encrypt(tx
);
1038 return ieee80211_crypto_hw_encrypt(tx
);
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1047 struct sk_buff
*skb
;
1048 struct ieee80211_hdr
*hdr
;
1052 skb_queue_walk(&tx
->skbs
, skb
) {
1053 hdr
= (void *) skb
->data
;
1054 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1055 break; /* must not overwrite AID */
1056 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1057 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1058 next_len
= next
->len
;
1061 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1064 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1070 /* actual transmit path */
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1073 struct sk_buff
*skb
,
1074 struct ieee80211_tx_info
*info
,
1075 struct tid_ampdu_tx
*tid_tx
,
1078 bool queued
= false;
1079 bool reset_agg_timer
= false;
1080 struct sk_buff
*purge_skb
= NULL
;
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1083 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1084 reset_agg_timer
= true;
1085 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1090 } else if (!tx
->sta
->sta
.txq
[tid
]) {
1091 spin_lock(&tx
->sta
->lock
);
1093 * Need to re-check now, because we may get here
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1110 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1115 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1116 reset_agg_timer
= true;
1119 info
->control
.vif
= &tx
->sdata
->vif
;
1120 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1121 info
->flags
&= ~IEEE80211_TX_TEMPORARY_FLAGS
|
1122 IEEE80211_TX_CTL_NO_PS_BUFFER
|
1123 IEEE80211_TX_STATUS_EOSP
;
1124 __skb_queue_tail(&tid_tx
->pending
, skb
);
1125 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1126 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1128 spin_unlock(&tx
->sta
->lock
);
1131 ieee80211_free_txskb(&tx
->local
->hw
, purge_skb
);
1134 /* reset session timer */
1135 if (reset_agg_timer
&& tid_tx
->timeout
)
1136 tid_tx
->last_tx
= jiffies
;
1143 * pass %NULL for the station if unknown, a valid pointer if known
1144 * or an ERR_PTR() if the station is known not to exist
1146 static ieee80211_tx_result
1147 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1148 struct ieee80211_tx_data
*tx
,
1149 struct sta_info
*sta
, struct sk_buff
*skb
)
1151 struct ieee80211_local
*local
= sdata
->local
;
1152 struct ieee80211_hdr
*hdr
;
1153 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1157 memset(tx
, 0, sizeof(*tx
));
1161 __skb_queue_head_init(&tx
->skbs
);
1164 * If this flag is set to true anywhere, and we get here,
1165 * we are doing the needed processing, so remove the flag
1168 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1170 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1176 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1177 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1178 if (!tx
->sta
&& sdata
->wdev
.use_4addr
)
1180 } else if (info
->flags
& (IEEE80211_TX_INTFL_NL80211_FRAME_TX
|
1181 IEEE80211_TX_CTL_INJECTED
) ||
1182 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1183 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1185 if (!tx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
))
1186 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1189 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1190 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1191 ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
1192 !ieee80211_hw_check(&local
->hw
, TX_AMPDU_SETUP_IN_HW
)) {
1193 struct tid_ampdu_tx
*tid_tx
;
1195 qc
= ieee80211_get_qos_ctl(hdr
);
1196 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1198 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1202 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1205 if (unlikely(queued
))
1210 if (is_multicast_ether_addr(hdr
->addr1
)) {
1211 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1212 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1214 tx
->flags
|= IEEE80211_TX_UNICAST
;
1216 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1217 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1218 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1219 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1220 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1224 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1225 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
)) {
1226 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1227 ieee80211_check_fast_xmit(tx
->sta
);
1230 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1235 static void ieee80211_drv_tx(struct ieee80211_local
*local
,
1236 struct ieee80211_vif
*vif
,
1237 struct ieee80211_sta
*pubsta
,
1238 struct sk_buff
*skb
)
1240 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1241 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1242 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1243 struct ieee80211_tx_control control
= {
1246 struct ieee80211_txq
*txq
= NULL
;
1247 struct txq_info
*txqi
;
1250 if ((info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
) ||
1251 (info
->control
.flags
& IEEE80211_TX_CTRL_PS_RESPONSE
))
1254 if (!ieee80211_is_data(hdr
->frame_control
))
1258 u8 tid
= skb
->priority
& IEEE80211_QOS_CTL_TID_MASK
;
1260 txq
= pubsta
->txq
[tid
];
1269 txqi
= to_txq_info(txq
);
1270 atomic_inc(&sdata
->txqs_len
[ac
]);
1271 if (atomic_read(&sdata
->txqs_len
[ac
]) >= local
->hw
.txq_ac_max_pending
)
1272 netif_stop_subqueue(sdata
->dev
, ac
);
1274 spin_lock_bh(&txqi
->queue
.lock
);
1275 txqi
->byte_cnt
+= skb
->len
;
1276 __skb_queue_tail(&txqi
->queue
, skb
);
1277 spin_unlock_bh(&txqi
->queue
.lock
);
1279 drv_wake_tx_queue(local
, txqi
);
1284 drv_tx(local
, &control
, skb
);
1287 struct sk_buff
*ieee80211_tx_dequeue(struct ieee80211_hw
*hw
,
1288 struct ieee80211_txq
*txq
)
1290 struct ieee80211_local
*local
= hw_to_local(hw
);
1291 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(txq
->vif
);
1292 struct txq_info
*txqi
= container_of(txq
, struct txq_info
, txq
);
1293 struct ieee80211_hdr
*hdr
;
1294 struct sk_buff
*skb
= NULL
;
1297 spin_lock_bh(&txqi
->queue
.lock
);
1299 if (test_bit(IEEE80211_TXQ_STOP
, &txqi
->flags
))
1302 skb
= __skb_dequeue(&txqi
->queue
);
1306 txqi
->byte_cnt
-= skb
->len
;
1308 atomic_dec(&sdata
->txqs_len
[ac
]);
1309 if (__netif_subqueue_stopped(sdata
->dev
, ac
))
1310 ieee80211_propagate_queue_wake(local
, sdata
->vif
.hw_queue
[ac
]);
1312 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1313 if (txq
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
1314 struct sta_info
*sta
= container_of(txq
->sta
, struct sta_info
,
1316 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1318 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, txq
->tid
);
1319 if (test_bit(IEEE80211_TXQ_AMPDU
, &txqi
->flags
))
1320 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1322 info
->flags
&= ~IEEE80211_TX_CTL_AMPDU
;
1326 spin_unlock_bh(&txqi
->queue
.lock
);
1330 EXPORT_SYMBOL(ieee80211_tx_dequeue
);
1332 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1333 struct ieee80211_vif
*vif
,
1334 struct ieee80211_sta
*sta
,
1335 struct sk_buff_head
*skbs
,
1338 struct sk_buff
*skb
, *tmp
;
1339 unsigned long flags
;
1341 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1342 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1343 int q
= info
->hw_queue
;
1345 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1346 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1347 __skb_unlink(skb
, skbs
);
1348 ieee80211_free_txskb(&local
->hw
, skb
);
1353 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1354 if (local
->queue_stop_reasons
[q
] ||
1355 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1356 if (unlikely(info
->flags
&
1357 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
)) {
1358 if (local
->queue_stop_reasons
[q
] &
1359 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL
)) {
1361 * Drop off-channel frames if queues
1362 * are stopped for any reason other
1363 * than off-channel operation. Never
1366 spin_unlock_irqrestore(
1367 &local
->queue_stop_reason_lock
,
1369 ieee80211_purge_tx_queue(&local
->hw
,
1376 * Since queue is stopped, queue up frames for
1377 * later transmission from the tx-pending
1378 * tasklet when the queue is woken again.
1381 skb_queue_splice_init(skbs
,
1382 &local
->pending
[q
]);
1384 skb_queue_splice_tail_init(skbs
,
1385 &local
->pending
[q
]);
1387 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1392 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1394 info
->control
.vif
= vif
;
1396 __skb_unlink(skb
, skbs
);
1397 ieee80211_drv_tx(local
, vif
, sta
, skb
);
1404 * Returns false if the frame couldn't be transmitted but was queued instead.
1406 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1407 struct sk_buff_head
*skbs
, int led_len
,
1408 struct sta_info
*sta
, bool txpending
)
1410 struct ieee80211_tx_info
*info
;
1411 struct ieee80211_sub_if_data
*sdata
;
1412 struct ieee80211_vif
*vif
;
1413 struct ieee80211_sta
*pubsta
;
1414 struct sk_buff
*skb
;
1418 if (WARN_ON(skb_queue_empty(skbs
)))
1421 skb
= skb_peek(skbs
);
1422 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1423 info
= IEEE80211_SKB_CB(skb
);
1424 sdata
= vif_to_sdata(info
->control
.vif
);
1425 if (sta
&& !sta
->uploaded
)
1433 switch (sdata
->vif
.type
) {
1434 case NL80211_IFTYPE_MONITOR
:
1435 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_ACTIVE
) {
1439 sdata
= rcu_dereference(local
->monitor_sdata
);
1443 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1444 } else if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
)) {
1445 ieee80211_purge_tx_queue(&local
->hw
, skbs
);
1450 case NL80211_IFTYPE_AP_VLAN
:
1451 sdata
= container_of(sdata
->bss
,
1452 struct ieee80211_sub_if_data
, u
.ap
);
1459 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1462 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1464 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1470 * Invoke TX handlers, return 0 on success and non-zero if the
1471 * frame was dropped or queued.
1473 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1475 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1476 ieee80211_tx_result res
= TX_DROP
;
1478 #define CALL_TXH(txh) \
1481 if (res != TX_CONTINUE) \
1485 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1486 CALL_TXH(ieee80211_tx_h_check_assoc
);
1487 CALL_TXH(ieee80211_tx_h_ps_buf
);
1488 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1489 CALL_TXH(ieee80211_tx_h_select_key
);
1490 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1491 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1493 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1494 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1499 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1500 CALL_TXH(ieee80211_tx_h_sequence
);
1501 CALL_TXH(ieee80211_tx_h_fragment
);
1502 /* handlers after fragment must be aware of tx info fragmentation! */
1503 CALL_TXH(ieee80211_tx_h_stats
);
1504 CALL_TXH(ieee80211_tx_h_encrypt
);
1505 if (!ieee80211_hw_check(&tx
->local
->hw
, HAS_RATE_CONTROL
))
1506 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1510 if (unlikely(res
== TX_DROP
)) {
1511 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1513 ieee80211_free_txskb(&tx
->local
->hw
, tx
->skb
);
1515 ieee80211_purge_tx_queue(&tx
->local
->hw
, &tx
->skbs
);
1517 } else if (unlikely(res
== TX_QUEUED
)) {
1518 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1525 bool ieee80211_tx_prepare_skb(struct ieee80211_hw
*hw
,
1526 struct ieee80211_vif
*vif
, struct sk_buff
*skb
,
1527 int band
, struct ieee80211_sta
**sta
)
1529 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1530 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1531 struct ieee80211_tx_data tx
;
1532 struct sk_buff
*skb2
;
1534 if (ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
) == TX_DROP
)
1538 info
->control
.vif
= vif
;
1539 info
->hw_queue
= vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1541 if (invoke_tx_handlers(&tx
))
1546 *sta
= &tx
.sta
->sta
;
1551 /* this function isn't suitable for fragmented data frames */
1552 skb2
= __skb_dequeue(&tx
.skbs
);
1553 if (WARN_ON(skb2
!= skb
|| !skb_queue_empty(&tx
.skbs
))) {
1554 ieee80211_free_txskb(hw
, skb2
);
1555 ieee80211_purge_tx_queue(hw
, &tx
.skbs
);
1561 EXPORT_SYMBOL(ieee80211_tx_prepare_skb
);
1564 * Returns false if the frame couldn't be transmitted but was queued instead.
1566 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1567 struct sta_info
*sta
, struct sk_buff
*skb
,
1570 struct ieee80211_local
*local
= sdata
->local
;
1571 struct ieee80211_tx_data tx
;
1572 ieee80211_tx_result res_prepare
;
1573 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1577 if (unlikely(skb
->len
< 10)) {
1582 /* initialises tx */
1584 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, sta
, skb
);
1586 if (unlikely(res_prepare
== TX_DROP
)) {
1587 ieee80211_free_txskb(&local
->hw
, skb
);
1589 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1593 /* set up hw_queue value early */
1594 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1595 !ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
1597 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1599 if (!invoke_tx_handlers(&tx
))
1600 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1606 /* device xmit handlers */
1608 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1609 struct sk_buff
*skb
,
1610 int head_need
, bool may_encrypt
)
1612 struct ieee80211_local
*local
= sdata
->local
;
1615 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1616 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1617 tail_need
-= skb_tailroom(skb
);
1618 tail_need
= max_t(int, tail_need
, 0);
1621 if (skb_cloned(skb
) &&
1622 (!ieee80211_hw_check(&local
->hw
, SUPPORTS_CLONED_SKBS
) ||
1623 !skb_clone_writable(skb
, ETH_HLEN
) ||
1624 (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
)))
1625 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1626 else if (head_need
|| tail_need
)
1627 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1631 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1632 wiphy_debug(local
->hw
.wiphy
,
1633 "failed to reallocate TX buffer\n");
1640 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1641 struct sta_info
*sta
, struct sk_buff
*skb
)
1643 struct ieee80211_local
*local
= sdata
->local
;
1644 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1645 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1649 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1651 headroom
= local
->tx_headroom
;
1653 headroom
+= sdata
->encrypt_headroom
;
1654 headroom
-= skb_headroom(skb
);
1655 headroom
= max_t(int, 0, headroom
);
1657 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1658 ieee80211_free_txskb(&local
->hw
, skb
);
1662 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1663 info
->control
.vif
= &sdata
->vif
;
1665 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1666 if (ieee80211_is_data(hdr
->frame_control
) &&
1667 is_unicast_ether_addr(hdr
->addr1
)) {
1668 if (mesh_nexthop_resolve(sdata
, skb
))
1669 return; /* skb queued: don't free */
1671 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
1675 ieee80211_set_qos_hdr(sdata
, skb
);
1676 ieee80211_tx(sdata
, sta
, skb
, false);
1679 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local
*local
,
1680 struct sk_buff
*skb
)
1682 struct ieee80211_radiotap_iterator iterator
;
1683 struct ieee80211_radiotap_header
*rthdr
=
1684 (struct ieee80211_radiotap_header
*) skb
->data
;
1685 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1686 struct ieee80211_supported_band
*sband
=
1687 local
->hw
.wiphy
->bands
[info
->band
];
1688 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1692 bool rate_found
= false;
1693 u8 rate_retries
= 0;
1695 u8 mcs_known
, mcs_flags
;
1698 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1699 IEEE80211_TX_CTL_DONTFRAG
;
1702 * for every radiotap entry that is present
1703 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1704 * entries present, or -EINVAL on error)
1708 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1713 /* see if this argument is something we can use */
1714 switch (iterator
.this_arg_index
) {
1716 * You must take care when dereferencing iterator.this_arg
1717 * for multibyte types... the pointer is not aligned. Use
1718 * get_unaligned((type *)iterator.this_arg) to dereference
1719 * iterator.this_arg for type "type" safely on all arches.
1721 case IEEE80211_RADIOTAP_FLAGS
:
1722 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1724 * this indicates that the skb we have been
1725 * handed has the 32-bit FCS CRC at the end...
1726 * we should react to that by snipping it off
1727 * because it will be recomputed and added
1730 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1733 skb_trim(skb
, skb
->len
- FCS_LEN
);
1735 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1736 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1737 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1738 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1741 case IEEE80211_RADIOTAP_TX_FLAGS
:
1742 txflags
= get_unaligned_le16(iterator
.this_arg
);
1743 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1744 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1747 case IEEE80211_RADIOTAP_RATE
:
1748 rate
= *iterator
.this_arg
;
1753 case IEEE80211_RADIOTAP_DATA_RETRIES
:
1754 rate_retries
= *iterator
.this_arg
;
1757 case IEEE80211_RADIOTAP_MCS
:
1758 mcs_known
= iterator
.this_arg
[0];
1759 mcs_flags
= iterator
.this_arg
[1];
1760 if (!(mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_MCS
))
1764 rate
= iterator
.this_arg
[2];
1765 rate_flags
= IEEE80211_TX_RC_MCS
;
1767 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_GI
&&
1768 mcs_flags
& IEEE80211_RADIOTAP_MCS_SGI
)
1769 rate_flags
|= IEEE80211_TX_RC_SHORT_GI
;
1771 if (mcs_known
& IEEE80211_RADIOTAP_MCS_HAVE_BW
&&
1772 mcs_flags
& IEEE80211_RADIOTAP_MCS_BW_40
)
1773 rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
1777 * Please update the file
1778 * Documentation/networking/mac80211-injection.txt
1779 * when parsing new fields here.
1787 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1791 info
->control
.flags
|= IEEE80211_TX_CTRL_RATE_INJECT
;
1793 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
1794 info
->control
.rates
[i
].idx
= -1;
1795 info
->control
.rates
[i
].flags
= 0;
1796 info
->control
.rates
[i
].count
= 0;
1799 if (rate_flags
& IEEE80211_TX_RC_MCS
) {
1800 info
->control
.rates
[0].idx
= rate
;
1802 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
1803 if (rate
* 5 != sband
->bitrates
[i
].bitrate
)
1806 info
->control
.rates
[0].idx
= i
;
1811 info
->control
.rates
[0].flags
= rate_flags
;
1812 info
->control
.rates
[0].count
= min_t(u8
, rate_retries
+ 1,
1813 local
->hw
.max_rate_tries
);
1817 * remove the radiotap header
1818 * iterator->_max_length was sanity-checked against
1819 * skb->len by iterator init
1821 skb_pull(skb
, iterator
._max_length
);
1826 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1827 struct net_device
*dev
)
1829 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1830 struct ieee80211_chanctx_conf
*chanctx_conf
;
1831 struct ieee80211_radiotap_header
*prthdr
=
1832 (struct ieee80211_radiotap_header
*)skb
->data
;
1833 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1834 struct ieee80211_hdr
*hdr
;
1835 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1836 struct cfg80211_chan_def
*chandef
;
1840 /* check for not even having the fixed radiotap header part */
1841 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1842 goto fail
; /* too short to be possibly valid */
1844 /* is it a header version we can trust to find length from? */
1845 if (unlikely(prthdr
->it_version
))
1846 goto fail
; /* only version 0 is supported */
1848 /* then there must be a radiotap header with a length we can use */
1849 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1851 /* does the skb contain enough to deliver on the alleged length? */
1852 if (unlikely(skb
->len
< len_rthdr
))
1853 goto fail
; /* skb too short for claimed rt header extent */
1856 * fix up the pointers accounting for the radiotap
1857 * header still being in there. We are being given
1858 * a precooked IEEE80211 header so no need for
1861 skb_set_mac_header(skb
, len_rthdr
);
1863 * these are just fixed to the end of the rt area since we
1864 * don't have any better information and at this point, nobody cares
1866 skb_set_network_header(skb
, len_rthdr
);
1867 skb_set_transport_header(skb
, len_rthdr
);
1869 if (skb
->len
< len_rthdr
+ 2)
1872 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1873 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1875 if (skb
->len
< len_rthdr
+ hdrlen
)
1879 * Initialize skb->protocol if the injected frame is a data frame
1880 * carrying a rfc1042 header
1882 if (ieee80211_is_data(hdr
->frame_control
) &&
1883 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1884 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1886 if (ether_addr_equal(payload
, rfc1042_header
))
1887 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1891 memset(info
, 0, sizeof(*info
));
1893 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1894 IEEE80211_TX_CTL_INJECTED
;
1899 * We process outgoing injected frames that have a local address
1900 * we handle as though they are non-injected frames.
1901 * This code here isn't entirely correct, the local MAC address
1902 * isn't always enough to find the interface to use; for proper
1903 * VLAN/WDS support we will need a different mechanism (which
1904 * likely isn't going to be monitor interfaces).
1906 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1908 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1909 if (!ieee80211_sdata_running(tmp_sdata
))
1911 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1912 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1913 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1915 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1921 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1922 if (!chanctx_conf
) {
1923 tmp_sdata
= rcu_dereference(local
->monitor_sdata
);
1926 rcu_dereference(tmp_sdata
->vif
.chanctx_conf
);
1930 chandef
= &chanctx_conf
->def
;
1931 else if (!local
->use_chanctx
)
1932 chandef
= &local
->_oper_chandef
;
1937 * Frame injection is not allowed if beaconing is not allowed
1938 * or if we need radar detection. Beaconing is usually not allowed when
1939 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1940 * Passive scan is also used in world regulatory domains where
1941 * your country is not known and as such it should be treated as
1942 * NO TX unless the channel is explicitly allowed in which case
1943 * your current regulatory domain would not have the passive scan
1946 * Since AP mode uses monitor interfaces to inject/TX management
1947 * frames we can make AP mode the exception to this rule once it
1948 * supports radar detection as its implementation can deal with
1949 * radar detection by itself. We can do that later by adding a
1950 * monitor flag interfaces used for AP support.
1952 if (!cfg80211_reg_can_beacon(local
->hw
.wiphy
, chandef
,
1956 info
->band
= chandef
->chan
->band
;
1958 /* process and remove the injection radiotap header */
1959 if (!ieee80211_parse_tx_radiotap(local
, skb
))
1962 ieee80211_xmit(sdata
, NULL
, skb
);
1965 return NETDEV_TX_OK
;
1971 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1974 static inline bool ieee80211_is_tdls_setup(struct sk_buff
*skb
)
1976 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1978 return ethertype
== ETH_P_TDLS
&&
1980 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
;
1983 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data
*sdata
,
1984 struct sk_buff
*skb
,
1985 struct sta_info
**sta_out
)
1987 struct sta_info
*sta
;
1989 switch (sdata
->vif
.type
) {
1990 case NL80211_IFTYPE_AP_VLAN
:
1991 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1995 } else if (sdata
->wdev
.use_4addr
) {
1999 case NL80211_IFTYPE_AP
:
2000 case NL80211_IFTYPE_OCB
:
2001 case NL80211_IFTYPE_ADHOC
:
2002 if (is_multicast_ether_addr(skb
->data
)) {
2003 *sta_out
= ERR_PTR(-ENOENT
);
2006 sta
= sta_info_get_bss(sdata
, skb
->data
);
2008 case NL80211_IFTYPE_WDS
:
2009 sta
= sta_info_get(sdata
, sdata
->u
.wds
.remote_addr
);
2011 #ifdef CONFIG_MAC80211_MESH
2012 case NL80211_IFTYPE_MESH_POINT
:
2013 /* determined much later */
2017 case NL80211_IFTYPE_STATION
:
2018 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
2019 sta
= sta_info_get(sdata
, skb
->data
);
2021 bool tdls_peer
, tdls_auth
;
2023 tdls_peer
= test_sta_flag(sta
,
2024 WLAN_STA_TDLS_PEER
);
2025 tdls_auth
= test_sta_flag(sta
,
2026 WLAN_STA_TDLS_PEER_AUTH
);
2028 if (tdls_peer
&& tdls_auth
) {
2034 * TDLS link during setup - throw out frames to
2035 * peer. Allow TDLS-setup frames to unauthorized
2036 * peers for the special case of a link teardown
2037 * after a TDLS sta is removed due to being
2040 if (tdls_peer
&& !tdls_auth
&&
2041 !ieee80211_is_tdls_setup(skb
))
2047 sta
= sta_info_get(sdata
, sdata
->u
.mgd
.bssid
);
2055 *sta_out
= sta
?: ERR_PTR(-ENOENT
);
2060 * ieee80211_build_hdr - build 802.11 header in the given frame
2061 * @sdata: virtual interface to build the header for
2062 * @skb: the skb to build the header in
2063 * @info_flags: skb flags to set
2065 * This function takes the skb with 802.3 header and reformats the header to
2066 * the appropriate IEEE 802.11 header based on which interface the packet is
2067 * being transmitted on.
2069 * Note that this function also takes care of the TX status request and
2070 * potential unsharing of the SKB - this needs to be interleaved with the
2073 * The function requires the read-side RCU lock held
2075 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2077 static struct sk_buff
*ieee80211_build_hdr(struct ieee80211_sub_if_data
*sdata
,
2078 struct sk_buff
*skb
, u32 info_flags
,
2079 struct sta_info
*sta
)
2081 struct ieee80211_local
*local
= sdata
->local
;
2082 struct ieee80211_tx_info
*info
;
2084 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
2086 struct ieee80211_hdr hdr
;
2087 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
2088 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
2089 const u8
*encaps_data
;
2090 int encaps_len
, skip_header_bytes
;
2092 bool wme_sta
= false, authorized
= false;
2096 struct ieee80211_chanctx_conf
*chanctx_conf
;
2097 struct ieee80211_sub_if_data
*ap_sdata
;
2098 enum ieee80211_band band
;
2104 /* convert Ethernet header to proper 802.11 header (based on
2105 * operation mode) */
2106 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2107 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2109 switch (sdata
->vif
.type
) {
2110 case NL80211_IFTYPE_AP_VLAN
:
2111 if (sdata
->wdev
.use_4addr
) {
2112 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2114 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
2115 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2116 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2117 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2119 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2120 wme_sta
= sta
->sta
.wme
;
2122 ap_sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2124 chanctx_conf
= rcu_dereference(ap_sdata
->vif
.chanctx_conf
);
2125 if (!chanctx_conf
) {
2129 band
= chanctx_conf
->def
.chan
->band
;
2130 if (sdata
->wdev
.use_4addr
)
2133 case NL80211_IFTYPE_AP
:
2134 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2135 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2136 if (!chanctx_conf
) {
2140 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2142 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2143 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2144 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2146 band
= chanctx_conf
->def
.chan
->band
;
2148 case NL80211_IFTYPE_WDS
:
2149 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
2151 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
2152 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2153 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2154 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2157 * This is the exception! WDS style interfaces are prohibited
2158 * when channel contexts are in used so this must be valid
2160 band
= local
->hw
.conf
.chandef
.chan
->band
;
2162 #ifdef CONFIG_MAC80211_MESH
2163 case NL80211_IFTYPE_MESH_POINT
:
2164 if (!is_multicast_ether_addr(skb
->data
)) {
2165 struct sta_info
*next_hop
;
2166 bool mpp_lookup
= true;
2168 mpath
= mesh_path_lookup(sdata
, skb
->data
);
2171 next_hop
= rcu_dereference(mpath
->next_hop
);
2173 !(mpath
->flags
& (MESH_PATH_ACTIVE
|
2174 MESH_PATH_RESOLVING
)))
2179 mppath
= mpp_path_lookup(sdata
, skb
->data
);
2181 mppath
->exp_time
= jiffies
;
2184 if (mppath
&& mpath
)
2185 mesh_path_del(mpath
->sdata
, mpath
->dst
);
2189 * Use address extension if it is a packet from
2190 * another interface or if we know the destination
2191 * is being proxied by a portal (i.e. portal address
2192 * differs from proxied address)
2194 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
2195 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
2196 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2197 skb
->data
, skb
->data
+ ETH_ALEN
);
2198 meshhdrlen
= ieee80211_new_mesh_header(sdata
, &mesh_hdr
,
2201 /* DS -> MBSS (802.11-2012 13.11.3.3).
2202 * For unicast with unknown forwarding information,
2203 * destination might be in the MBSS or if that fails
2204 * forwarded to another mesh gate. In either case
2205 * resolution will be handled in ieee80211_xmit(), so
2206 * leave the original DA. This also works for mcast */
2207 const u8
*mesh_da
= skb
->data
;
2210 mesh_da
= mppath
->mpp
;
2212 mesh_da
= mpath
->dst
;
2214 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
2215 mesh_da
, sdata
->vif
.addr
);
2216 if (is_multicast_ether_addr(mesh_da
))
2217 /* DA TA mSA AE:SA */
2218 meshhdrlen
= ieee80211_new_mesh_header(
2220 skb
->data
+ ETH_ALEN
, NULL
);
2222 /* RA TA mDA mSA AE:DA SA */
2223 meshhdrlen
= ieee80211_new_mesh_header(
2224 sdata
, &mesh_hdr
, skb
->data
,
2225 skb
->data
+ ETH_ALEN
);
2228 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2229 if (!chanctx_conf
) {
2233 band
= chanctx_conf
->def
.chan
->band
;
2236 case NL80211_IFTYPE_STATION
:
2237 /* we already did checks when looking up the RA STA */
2238 tdls_peer
= test_sta_flag(sta
, WLAN_STA_TDLS_PEER
);
2242 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2243 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2244 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2246 } else if (sdata
->u
.mgd
.use_4addr
&&
2247 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
2248 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2249 IEEE80211_FCTL_TODS
);
2251 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2252 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2253 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2254 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2257 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2259 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2260 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2261 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
2264 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2265 if (!chanctx_conf
) {
2269 band
= chanctx_conf
->def
.chan
->band
;
2271 case NL80211_IFTYPE_OCB
:
2273 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2274 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2275 eth_broadcast_addr(hdr
.addr3
);
2277 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2278 if (!chanctx_conf
) {
2282 band
= chanctx_conf
->def
.chan
->band
;
2284 case NL80211_IFTYPE_ADHOC
:
2286 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
2287 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
2288 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2290 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2291 if (!chanctx_conf
) {
2295 band
= chanctx_conf
->def
.chan
->band
;
2302 multicast
= is_multicast_ether_addr(hdr
.addr1
);
2304 /* sta is always NULL for mesh */
2306 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
2307 wme_sta
= sta
->sta
.wme
;
2308 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2309 /* For mesh, the use of the QoS header is mandatory */
2313 /* receiver does QoS (which also means we do) use it */
2315 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2320 * Drop unicast frames to unauthorised stations unless they are
2321 * EAPOL frames from the local station.
2323 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2324 (sdata
->vif
.type
!= NL80211_IFTYPE_OCB
) &&
2325 !multicast
&& !authorized
&&
2326 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
2327 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
2328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2329 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2330 sdata
->name
, hdr
.addr1
);
2333 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
2339 if (unlikely(!multicast
&& skb
->sk
&&
2340 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
2341 struct sk_buff
*ack_skb
= skb_clone_sk(skb
);
2344 unsigned long flags
;
2347 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
2348 id
= idr_alloc(&local
->ack_status_frames
, ack_skb
,
2349 1, 0x10000, GFP_ATOMIC
);
2350 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
2354 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
2362 * If the skb is shared we need to obtain our own copy.
2364 if (skb_shared(skb
)) {
2365 struct sk_buff
*tmp_skb
= skb
;
2367 /* can't happen -- skb is a clone if info_id != 0 */
2370 skb
= skb_clone(skb
, GFP_ATOMIC
);
2379 hdr
.frame_control
= fc
;
2380 hdr
.duration_id
= 0;
2383 skip_header_bytes
= ETH_HLEN
;
2384 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2385 encaps_data
= bridge_tunnel_header
;
2386 encaps_len
= sizeof(bridge_tunnel_header
);
2387 skip_header_bytes
-= 2;
2388 } else if (ethertype
>= ETH_P_802_3_MIN
) {
2389 encaps_data
= rfc1042_header
;
2390 encaps_len
= sizeof(rfc1042_header
);
2391 skip_header_bytes
-= 2;
2397 nh_pos
= skb_network_header(skb
) - skb
->data
;
2398 h_pos
= skb_transport_header(skb
) - skb
->data
;
2400 skb_pull(skb
, skip_header_bytes
);
2401 nh_pos
-= skip_header_bytes
;
2402 h_pos
-= skip_header_bytes
;
2404 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2407 * So we need to modify the skb header and hence need a copy of
2408 * that. The head_need variable above doesn't, so far, include
2409 * the needed header space that we don't need right away. If we
2410 * can, then we don't reallocate right now but only after the
2411 * frame arrives at the master device (if it does...)
2413 * If we cannot, however, then we will reallocate to include all
2414 * the ever needed space. Also, if we need to reallocate it anyway,
2415 * make it big enough for everything we may ever need.
2418 if (head_need
> 0 || skb_cloned(skb
)) {
2419 head_need
+= sdata
->encrypt_headroom
;
2420 head_need
+= local
->tx_headroom
;
2421 head_need
= max_t(int, 0, head_need
);
2422 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true)) {
2423 ieee80211_free_txskb(&local
->hw
, skb
);
2425 return ERR_PTR(-ENOMEM
);
2430 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2431 nh_pos
+= encaps_len
;
2432 h_pos
+= encaps_len
;
2435 #ifdef CONFIG_MAC80211_MESH
2436 if (meshhdrlen
> 0) {
2437 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2438 nh_pos
+= meshhdrlen
;
2439 h_pos
+= meshhdrlen
;
2443 if (ieee80211_is_data_qos(fc
)) {
2444 __le16
*qos_control
;
2446 qos_control
= (__le16
*) skb_push(skb
, 2);
2447 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2449 * Maybe we could actually set some fields here, for now just
2450 * initialise to zero to indicate no special operation.
2454 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2459 /* Update skb pointers to various headers since this modified frame
2460 * is going to go through Linux networking code that may potentially
2461 * need things like pointer to IP header. */
2462 skb_reset_mac_header(skb
);
2463 skb_set_network_header(skb
, nh_pos
);
2464 skb_set_transport_header(skb
, h_pos
);
2466 info
= IEEE80211_SKB_CB(skb
);
2467 memset(info
, 0, sizeof(*info
));
2469 info
->flags
= info_flags
;
2470 info
->ack_frame_id
= info_id
;
2476 return ERR_PTR(ret
);
2480 * fast-xmit overview
2482 * The core idea of this fast-xmit is to remove per-packet checks by checking
2483 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2484 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2485 * much less work can be done per packet. For example, fragmentation must be
2486 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2489 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2490 * header and other data to aid packet processing in ieee80211_xmit_fast().
2492 * The most difficult part of this is that when any of these assumptions
2493 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2494 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2495 * since the per-packet code no longer checks the conditions. This is reflected
2496 * by the calls to these functions throughout the rest of the code, and must be
2497 * maintained if any of the TX path checks change.
2500 void ieee80211_check_fast_xmit(struct sta_info
*sta
)
2502 struct ieee80211_fast_tx build
= {}, *fast_tx
= NULL
, *old
;
2503 struct ieee80211_local
*local
= sta
->local
;
2504 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
2505 struct ieee80211_hdr
*hdr
= (void *)build
.hdr
;
2506 struct ieee80211_chanctx_conf
*chanctx_conf
;
2509 if (!ieee80211_hw_check(&local
->hw
, SUPPORT_FAST_XMIT
))
2512 /* Locking here protects both the pointer itself, and against concurrent
2513 * invocations winning data access races to, e.g., the key pointer that
2515 * Without it, the invocation of this function right after the key
2516 * pointer changes wouldn't be sufficient, as another CPU could access
2517 * the pointer, then stall, and then do the cache update after the CPU
2518 * that invalidated the key.
2519 * With the locking, such scenarios cannot happen as the check for the
2520 * key and the fast-tx assignment are done atomically, so the CPU that
2521 * modifies the key will either wait or other one will see the key
2522 * cleared/changed already.
2524 spin_lock_bh(&sta
->lock
);
2525 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
2526 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2527 sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2530 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
2533 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
2534 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
) ||
2535 test_sta_flag(sta
, WLAN_STA_PS_DELIVER
) ||
2536 test_sta_flag(sta
, WLAN_STA_CLEAR_PS_FILT
))
2539 if (sdata
->noack_map
)
2542 /* fast-xmit doesn't handle fragmentation at all */
2543 if (local
->hw
.wiphy
->frag_threshold
!= (u32
)-1 &&
2544 !local
->ops
->set_frag_threshold
)
2548 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
2549 if (!chanctx_conf
) {
2553 build
.band
= chanctx_conf
->def
.chan
->band
;
2556 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
2558 switch (sdata
->vif
.type
) {
2559 case NL80211_IFTYPE_ADHOC
:
2561 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2562 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2563 memcpy(hdr
->addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
2566 case NL80211_IFTYPE_STATION
:
2567 if (test_sta_flag(sta
, WLAN_STA_TDLS_PEER
)) {
2569 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2570 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2571 memcpy(hdr
->addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2576 if (sdata
->u
.mgd
.use_4addr
) {
2577 /* non-regular ethertype cannot use the fastpath */
2578 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2579 IEEE80211_FCTL_TODS
);
2581 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2582 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2583 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2584 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2588 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
2590 memcpy(hdr
->addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2591 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2592 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
2595 case NL80211_IFTYPE_AP_VLAN
:
2596 if (sdata
->wdev
.use_4addr
) {
2597 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
2598 IEEE80211_FCTL_TODS
);
2600 memcpy(hdr
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
2601 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2602 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2603 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr4
);
2608 case NL80211_IFTYPE_AP
:
2609 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
2611 build
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
2612 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2613 build
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
2617 /* not handled on fast-xmit */
2623 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
2626 /* We store the key here so there's no point in using rcu_dereference()
2627 * but that's fine because the code that changes the pointers will call
2628 * this function after doing so. For a single CPU that would be enough,
2629 * for multiple see the comment above.
2631 build
.key
= rcu_access_pointer(sta
->ptk
[sta
->ptk_idx
]);
2633 build
.key
= rcu_access_pointer(sdata
->default_unicast_key
);
2635 bool gen_iv
, iv_spc
, mmic
;
2637 gen_iv
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
;
2638 iv_spc
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
;
2639 mmic
= build
.key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
;
2641 /* don't handle software crypto */
2642 if (!(build
.key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
2645 switch (build
.key
->conf
.cipher
) {
2646 case WLAN_CIPHER_SUITE_CCMP
:
2647 case WLAN_CIPHER_SUITE_CCMP_256
:
2648 /* add fixed key ID */
2650 (build
.hdr
+ build
.hdr_len
)[3] =
2651 0x20 | (build
.key
->conf
.keyidx
<< 6);
2652 build
.pn_offs
= build
.hdr_len
;
2654 if (gen_iv
|| iv_spc
)
2655 build
.hdr_len
+= IEEE80211_CCMP_HDR_LEN
;
2657 case WLAN_CIPHER_SUITE_GCMP
:
2658 case WLAN_CIPHER_SUITE_GCMP_256
:
2659 /* add fixed key ID */
2661 (build
.hdr
+ build
.hdr_len
)[3] =
2662 0x20 | (build
.key
->conf
.keyidx
<< 6);
2663 build
.pn_offs
= build
.hdr_len
;
2665 if (gen_iv
|| iv_spc
)
2666 build
.hdr_len
+= IEEE80211_GCMP_HDR_LEN
;
2668 case WLAN_CIPHER_SUITE_TKIP
:
2669 /* cannot handle MMIC or IV generation in xmit-fast */
2673 build
.hdr_len
+= IEEE80211_TKIP_IV_LEN
;
2675 case WLAN_CIPHER_SUITE_WEP40
:
2676 case WLAN_CIPHER_SUITE_WEP104
:
2677 /* cannot handle IV generation in fast-xmit */
2681 build
.hdr_len
+= IEEE80211_WEP_IV_LEN
;
2683 case WLAN_CIPHER_SUITE_AES_CMAC
:
2684 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
2685 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
2686 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
2688 "management cipher suite 0x%x enabled for data\n",
2689 build
.key
->conf
.cipher
);
2692 /* we don't know how to generate IVs for this at all */
2693 if (WARN_ON(gen_iv
))
2695 /* pure hardware keys are OK, of course */
2696 if (!(build
.key
->flags
& KEY_FLAG_CIPHER_SCHEME
))
2698 /* cipher scheme might require space allocation */
2700 build
.key
->conf
.iv_len
> IEEE80211_FAST_XMIT_MAX_IV
)
2703 build
.hdr_len
+= build
.key
->conf
.iv_len
;
2706 fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
2709 hdr
->frame_control
= fc
;
2711 memcpy(build
.hdr
+ build
.hdr_len
,
2712 rfc1042_header
, sizeof(rfc1042_header
));
2713 build
.hdr_len
+= sizeof(rfc1042_header
);
2715 fast_tx
= kmemdup(&build
, sizeof(build
), GFP_ATOMIC
);
2716 /* if the kmemdup fails, continue w/o fast_tx */
2721 /* we might have raced against another call to this function */
2722 old
= rcu_dereference_protected(sta
->fast_tx
,
2723 lockdep_is_held(&sta
->lock
));
2724 rcu_assign_pointer(sta
->fast_tx
, fast_tx
);
2726 kfree_rcu(old
, rcu_head
);
2727 spin_unlock_bh(&sta
->lock
);
2730 void ieee80211_check_fast_xmit_all(struct ieee80211_local
*local
)
2732 struct sta_info
*sta
;
2735 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
2736 ieee80211_check_fast_xmit(sta
);
2740 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data
*sdata
)
2742 struct ieee80211_local
*local
= sdata
->local
;
2743 struct sta_info
*sta
;
2747 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
2748 if (sdata
!= sta
->sdata
&&
2749 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
2751 ieee80211_check_fast_xmit(sta
);
2757 void ieee80211_clear_fast_xmit(struct sta_info
*sta
)
2759 struct ieee80211_fast_tx
*fast_tx
;
2761 spin_lock_bh(&sta
->lock
);
2762 fast_tx
= rcu_dereference_protected(sta
->fast_tx
,
2763 lockdep_is_held(&sta
->lock
));
2764 RCU_INIT_POINTER(sta
->fast_tx
, NULL
);
2765 spin_unlock_bh(&sta
->lock
);
2768 kfree_rcu(fast_tx
, rcu_head
);
2771 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data
*sdata
,
2772 struct net_device
*dev
, struct sta_info
*sta
,
2773 struct ieee80211_fast_tx
*fast_tx
,
2774 struct sk_buff
*skb
)
2776 struct ieee80211_local
*local
= sdata
->local
;
2777 u16 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
2778 int extra_head
= fast_tx
->hdr_len
- (ETH_HLEN
- 2);
2779 int hw_headroom
= sdata
->local
->hw
.extra_tx_headroom
;
2781 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2782 struct ieee80211_hdr
*hdr
= (void *)fast_tx
->hdr
;
2783 struct ieee80211_tx_data tx
;
2784 ieee80211_tx_result r
;
2785 struct tid_ampdu_tx
*tid_tx
= NULL
;
2786 u8 tid
= IEEE80211_NUM_TIDS
;
2788 /* control port protocol needs a lot of special handling */
2789 if (cpu_to_be16(ethertype
) == sdata
->control_port_protocol
)
2792 /* only RFC 1042 SNAP */
2793 if (ethertype
< ETH_P_802_3_MIN
)
2796 /* don't handle TX status request here either */
2797 if (skb
->sk
&& skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)
2800 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
2801 tid
= skb
->priority
& IEEE80211_QOS_CTL_TAG1D_MASK
;
2802 tid_tx
= rcu_dereference(sta
->ampdu_mlme
.tid_tx
[tid
]);
2804 if (!test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
))
2806 if (tid_tx
->timeout
)
2807 tid_tx
->last_tx
= jiffies
;
2811 /* after this point (skb is modified) we cannot return false */
2813 if (skb_shared(skb
)) {
2814 struct sk_buff
*tmp_skb
= skb
;
2816 skb
= skb_clone(skb
, GFP_ATOMIC
);
2823 ieee80211_tx_stats(dev
, skb
->len
+ extra_head
);
2825 /* will not be crypto-handled beyond what we do here, so use false
2826 * as the may-encrypt argument for the resize to not account for
2827 * more room than we already have in 'extra_head'
2829 if (unlikely(ieee80211_skb_resize(sdata
, skb
,
2830 max_t(int, extra_head
+ hw_headroom
-
2831 skb_headroom(skb
), 0),
2837 memcpy(ð
, skb
->data
, ETH_HLEN
- 2);
2838 hdr
= (void *)skb_push(skb
, extra_head
);
2839 memcpy(skb
->data
, fast_tx
->hdr
, fast_tx
->hdr_len
);
2840 memcpy(skb
->data
+ fast_tx
->da_offs
, eth
.h_dest
, ETH_ALEN
);
2841 memcpy(skb
->data
+ fast_tx
->sa_offs
, eth
.h_source
, ETH_ALEN
);
2843 memset(info
, 0, sizeof(*info
));
2844 info
->band
= fast_tx
->band
;
2845 info
->control
.vif
= &sdata
->vif
;
2846 info
->flags
= IEEE80211_TX_CTL_FIRST_FRAGMENT
|
2847 IEEE80211_TX_CTL_DONTFRAG
|
2848 (tid_tx
? IEEE80211_TX_CTL_AMPDU
: 0);
2850 if (hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_QOS_DATA
)) {
2851 *ieee80211_get_qos_ctl(hdr
) = tid
;
2852 if (!sta
->sta
.txq
[0])
2853 hdr
->seq_ctrl
= ieee80211_tx_next_seq(sta
, tid
);
2855 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
2856 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence_number
);
2857 sdata
->sequence_number
+= 0x10;
2860 if (skb_shinfo(skb
)->gso_size
)
2861 sta
->tx_stats
.msdu
[tid
] +=
2862 DIV_ROUND_UP(skb
->len
, skb_shinfo(skb
)->gso_size
);
2864 sta
->tx_stats
.msdu
[tid
]++;
2866 info
->hw_queue
= sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
2868 __skb_queue_head_init(&tx
.skbs
);
2870 tx
.flags
= IEEE80211_TX_UNICAST
;
2874 tx
.key
= fast_tx
->key
;
2877 info
->control
.hw_key
= &fast_tx
->key
->conf
;
2879 if (!ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
2881 r
= ieee80211_tx_h_rate_ctrl(&tx
);
2885 if (r
!= TX_CONTINUE
) {
2892 /* statistics normally done by ieee80211_tx_h_stats (but that
2893 * has to consider fragmentation, so is more complex)
2895 sta
->tx_stats
.bytes
[skb_get_queue_mapping(skb
)] += skb
->len
;
2896 sta
->tx_stats
.packets
[skb_get_queue_mapping(skb
)]++;
2898 if (fast_tx
->pn_offs
) {
2900 u8
*crypto_hdr
= skb
->data
+ fast_tx
->pn_offs
;
2902 switch (fast_tx
->key
->conf
.cipher
) {
2903 case WLAN_CIPHER_SUITE_CCMP
:
2904 case WLAN_CIPHER_SUITE_CCMP_256
:
2905 case WLAN_CIPHER_SUITE_GCMP
:
2906 case WLAN_CIPHER_SUITE_GCMP_256
:
2907 pn
= atomic64_inc_return(&fast_tx
->key
->conf
.tx_pn
);
2909 crypto_hdr
[1] = pn
>> 8;
2910 crypto_hdr
[4] = pn
>> 16;
2911 crypto_hdr
[5] = pn
>> 24;
2912 crypto_hdr
[6] = pn
>> 32;
2913 crypto_hdr
[7] = pn
>> 40;
2918 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2919 sdata
= container_of(sdata
->bss
,
2920 struct ieee80211_sub_if_data
, u
.ap
);
2922 __skb_queue_tail(&tx
.skbs
, skb
);
2923 ieee80211_tx_frags(local
, &sdata
->vif
, &sta
->sta
, &tx
.skbs
, false);
2927 void __ieee80211_subif_start_xmit(struct sk_buff
*skb
,
2928 struct net_device
*dev
,
2931 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
2932 struct sta_info
*sta
;
2933 struct sk_buff
*next
;
2935 if (unlikely(skb
->len
< ETH_HLEN
)) {
2942 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
))
2945 if (!IS_ERR_OR_NULL(sta
)) {
2946 struct ieee80211_fast_tx
*fast_tx
;
2948 fast_tx
= rcu_dereference(sta
->fast_tx
);
2951 ieee80211_xmit_fast(sdata
, dev
, sta
, fast_tx
, skb
))
2955 if (skb_is_gso(skb
)) {
2956 struct sk_buff
*segs
;
2958 segs
= skb_gso_segment(skb
, 0);
2966 /* we cannot process non-linear frames on this path */
2967 if (skb_linearize(skb
)) {
2972 /* the frame could be fragmented, software-encrypted, and other
2973 * things so we cannot really handle checksum offload with it -
2974 * fix it up in software before we handle anything else.
2976 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2977 skb_set_transport_header(skb
,
2978 skb_checksum_start_offset(skb
));
2979 if (skb_checksum_help(skb
))
2992 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
2996 ieee80211_tx_stats(dev
, skb
->len
);
2998 ieee80211_xmit(sdata
, sta
, skb
);
3008 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3009 * @skb: packet to be sent
3010 * @dev: incoming interface
3012 * On failure skb will be freed.
3014 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
3015 struct net_device
*dev
)
3017 __ieee80211_subif_start_xmit(skb
, dev
, 0);
3018 return NETDEV_TX_OK
;
3022 ieee80211_build_data_template(struct ieee80211_sub_if_data
*sdata
,
3023 struct sk_buff
*skb
, u32 info_flags
)
3025 struct ieee80211_hdr
*hdr
;
3026 struct ieee80211_tx_data tx
= {
3027 .local
= sdata
->local
,
3030 struct sta_info
*sta
;
3034 if (ieee80211_lookup_ra_sta(sdata
, skb
, &sta
)) {
3036 skb
= ERR_PTR(-EINVAL
);
3040 skb
= ieee80211_build_hdr(sdata
, skb
, info_flags
, sta
);
3044 hdr
= (void *)skb
->data
;
3045 tx
.sta
= sta_info_get(sdata
, hdr
->addr1
);
3048 if (ieee80211_tx_h_select_key(&tx
) != TX_CONTINUE
) {
3051 return ERR_PTR(-EINVAL
);
3060 * ieee80211_clear_tx_pending may not be called in a context where
3061 * it is possible that it packets could come in again.
3063 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
3065 struct sk_buff
*skb
;
3068 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3069 while ((skb
= skb_dequeue(&local
->pending
[i
])) != NULL
)
3070 ieee80211_free_txskb(&local
->hw
, skb
);
3075 * Returns false if the frame couldn't be transmitted but was queued instead,
3076 * which in this case means re-queued -- take as an indication to stop sending
3077 * more pending frames.
3079 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
3080 struct sk_buff
*skb
)
3082 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3083 struct ieee80211_sub_if_data
*sdata
;
3084 struct sta_info
*sta
;
3085 struct ieee80211_hdr
*hdr
;
3087 struct ieee80211_chanctx_conf
*chanctx_conf
;
3089 sdata
= vif_to_sdata(info
->control
.vif
);
3091 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
3092 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3093 if (unlikely(!chanctx_conf
)) {
3097 info
->band
= chanctx_conf
->def
.chan
->band
;
3098 result
= ieee80211_tx(sdata
, NULL
, skb
, true);
3100 struct sk_buff_head skbs
;
3102 __skb_queue_head_init(&skbs
);
3103 __skb_queue_tail(&skbs
, skb
);
3105 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3106 sta
= sta_info_get(sdata
, hdr
->addr1
);
3108 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
3115 * Transmit all pending packets. Called from tasklet.
3117 void ieee80211_tx_pending(unsigned long data
)
3119 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
3120 unsigned long flags
;
3126 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
3127 for (i
= 0; i
< local
->hw
.queues
; i
++) {
3129 * If queue is stopped by something other than due to pending
3130 * frames, or we have no pending frames, proceed to next queue.
3132 if (local
->queue_stop_reasons
[i
] ||
3133 skb_queue_empty(&local
->pending
[i
]))
3136 while (!skb_queue_empty(&local
->pending
[i
])) {
3137 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
3138 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
3140 if (WARN_ON(!info
->control
.vif
)) {
3141 ieee80211_free_txskb(&local
->hw
, skb
);
3145 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
3148 txok
= ieee80211_tx_pending_skb(local
, skb
);
3149 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
3155 if (skb_queue_empty(&local
->pending
[i
]))
3156 ieee80211_propagate_queue_wake(local
, i
);
3158 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
3163 /* functions for drivers to get certain frames */
3165 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3166 struct ps_data
*ps
, struct sk_buff
*skb
,
3171 int i
, have_bits
= 0, n1
, n2
;
3173 /* Generate bitmap for TIM only if there are any STAs in power save
3175 if (atomic_read(&ps
->num_sta_ps
) > 0)
3176 /* in the hope that this is faster than
3177 * checking byte-for-byte */
3178 have_bits
= !bitmap_empty((unsigned long *)ps
->tim
,
3179 IEEE80211_MAX_AID
+1);
3181 if (ps
->dtim_count
== 0)
3182 ps
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
3187 tim
= pos
= (u8
*) skb_put(skb
, 6);
3188 *pos
++ = WLAN_EID_TIM
;
3190 *pos
++ = ps
->dtim_count
;
3191 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
3193 if (ps
->dtim_count
== 0 && !skb_queue_empty(&ps
->bc_buf
))
3196 ps
->dtim_bc_mc
= aid0
== 1;
3199 /* Find largest even number N1 so that bits numbered 1 through
3200 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3201 * (N2 + 1) x 8 through 2007 are 0. */
3203 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
3210 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
3217 /* Bitmap control */
3219 /* Part Virt Bitmap */
3220 skb_put(skb
, n2
- n1
);
3221 memcpy(pos
, ps
->tim
+ n1
, n2
- n1
+ 1);
3223 tim
[1] = n2
- n1
+ 4;
3225 *pos
++ = aid0
; /* Bitmap control */
3226 *pos
++ = 0; /* Part Virt Bitmap */
3230 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
3231 struct ps_data
*ps
, struct sk_buff
*skb
,
3234 struct ieee80211_local
*local
= sdata
->local
;
3237 * Not very nice, but we want to allow the driver to call
3238 * ieee80211_beacon_get() as a response to the set_tim()
3239 * callback. That, however, is already invoked under the
3240 * sta_lock to guarantee consistent and race-free update
3241 * of the tim bitmap in mac80211 and the driver.
3243 if (local
->tim_in_locked_section
) {
3244 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3246 spin_lock_bh(&local
->tim_lock
);
3247 __ieee80211_beacon_add_tim(sdata
, ps
, skb
, is_template
);
3248 spin_unlock_bh(&local
->tim_lock
);
3254 static void ieee80211_set_csa(struct ieee80211_sub_if_data
*sdata
,
3255 struct beacon_data
*beacon
)
3257 struct probe_resp
*resp
;
3259 size_t beacon_data_len
;
3261 u8 count
= beacon
->csa_current_counter
;
3263 switch (sdata
->vif
.type
) {
3264 case NL80211_IFTYPE_AP
:
3265 beacon_data
= beacon
->tail
;
3266 beacon_data_len
= beacon
->tail_len
;
3268 case NL80211_IFTYPE_ADHOC
:
3269 beacon_data
= beacon
->head
;
3270 beacon_data_len
= beacon
->head_len
;
3272 case NL80211_IFTYPE_MESH_POINT
:
3273 beacon_data
= beacon
->head
;
3274 beacon_data_len
= beacon
->head_len
;
3281 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; ++i
) {
3282 resp
= rcu_dereference(sdata
->u
.ap
.probe_resp
);
3284 if (beacon
->csa_counter_offsets
[i
]) {
3285 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[i
] >=
3291 beacon_data
[beacon
->csa_counter_offsets
[i
]] = count
;
3294 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
&& resp
)
3295 resp
->data
[resp
->csa_counter_offsets
[i
]] = count
;
3300 static u8
__ieee80211_csa_update_counter(struct beacon_data
*beacon
)
3302 beacon
->csa_current_counter
--;
3304 /* the counter should never reach 0 */
3305 WARN_ON_ONCE(!beacon
->csa_current_counter
);
3307 return beacon
->csa_current_counter
;
3310 u8
ieee80211_csa_update_counter(struct ieee80211_vif
*vif
)
3312 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3313 struct beacon_data
*beacon
= NULL
;
3318 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3319 beacon
= rcu_dereference(sdata
->u
.ap
.beacon
);
3320 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
3321 beacon
= rcu_dereference(sdata
->u
.ibss
.presp
);
3322 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
3323 beacon
= rcu_dereference(sdata
->u
.mesh
.beacon
);
3328 count
= __ieee80211_csa_update_counter(beacon
);
3334 EXPORT_SYMBOL(ieee80211_csa_update_counter
);
3336 bool ieee80211_csa_is_complete(struct ieee80211_vif
*vif
)
3338 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3339 struct beacon_data
*beacon
= NULL
;
3341 size_t beacon_data_len
;
3344 if (!ieee80211_sdata_running(sdata
))
3348 if (vif
->type
== NL80211_IFTYPE_AP
) {
3349 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3351 beacon
= rcu_dereference(ap
->beacon
);
3352 if (WARN_ON(!beacon
|| !beacon
->tail
))
3354 beacon_data
= beacon
->tail
;
3355 beacon_data_len
= beacon
->tail_len
;
3356 } else if (vif
->type
== NL80211_IFTYPE_ADHOC
) {
3357 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3359 beacon
= rcu_dereference(ifibss
->presp
);
3363 beacon_data
= beacon
->head
;
3364 beacon_data_len
= beacon
->head_len
;
3365 } else if (vif
->type
== NL80211_IFTYPE_MESH_POINT
) {
3366 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3368 beacon
= rcu_dereference(ifmsh
->beacon
);
3372 beacon_data
= beacon
->head
;
3373 beacon_data_len
= beacon
->head_len
;
3379 if (!beacon
->csa_counter_offsets
[0])
3382 if (WARN_ON_ONCE(beacon
->csa_counter_offsets
[0] > beacon_data_len
))
3385 if (beacon_data
[beacon
->csa_counter_offsets
[0]] == 1)
3392 EXPORT_SYMBOL(ieee80211_csa_is_complete
);
3394 static struct sk_buff
*
3395 __ieee80211_beacon_get(struct ieee80211_hw
*hw
,
3396 struct ieee80211_vif
*vif
,
3397 struct ieee80211_mutable_offsets
*offs
,
3400 struct ieee80211_local
*local
= hw_to_local(hw
);
3401 struct beacon_data
*beacon
= NULL
;
3402 struct sk_buff
*skb
= NULL
;
3403 struct ieee80211_tx_info
*info
;
3404 struct ieee80211_sub_if_data
*sdata
= NULL
;
3405 enum ieee80211_band band
;
3406 struct ieee80211_tx_rate_control txrc
;
3407 struct ieee80211_chanctx_conf
*chanctx_conf
;
3408 int csa_off_base
= 0;
3412 sdata
= vif_to_sdata(vif
);
3413 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3415 if (!ieee80211_sdata_running(sdata
) || !chanctx_conf
)
3419 memset(offs
, 0, sizeof(*offs
));
3421 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3422 struct ieee80211_if_ap
*ap
= &sdata
->u
.ap
;
3424 beacon
= rcu_dereference(ap
->beacon
);
3426 if (beacon
->csa_counter_offsets
[0]) {
3428 __ieee80211_csa_update_counter(beacon
);
3430 ieee80211_set_csa(sdata
, beacon
);
3434 * headroom, head length,
3435 * tail length and maximum TIM length
3437 skb
= dev_alloc_skb(local
->tx_headroom
+
3439 beacon
->tail_len
+ 256 +
3440 local
->hw
.extra_beacon_tailroom
);
3444 skb_reserve(skb
, local
->tx_headroom
);
3445 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3448 ieee80211_beacon_add_tim(sdata
, &ap
->ps
, skb
,
3452 offs
->tim_offset
= beacon
->head_len
;
3453 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3455 /* for AP the csa offsets are from tail */
3456 csa_off_base
= skb
->len
;
3460 memcpy(skb_put(skb
, beacon
->tail_len
),
3461 beacon
->tail
, beacon
->tail_len
);
3464 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
3465 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
3466 struct ieee80211_hdr
*hdr
;
3468 beacon
= rcu_dereference(ifibss
->presp
);
3472 if (beacon
->csa_counter_offsets
[0]) {
3474 __ieee80211_csa_update_counter(beacon
);
3476 ieee80211_set_csa(sdata
, beacon
);
3479 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
3480 local
->hw
.extra_beacon_tailroom
);
3483 skb_reserve(skb
, local
->tx_headroom
);
3484 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3487 hdr
= (struct ieee80211_hdr
*) skb
->data
;
3488 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3489 IEEE80211_STYPE_BEACON
);
3490 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3491 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
3493 beacon
= rcu_dereference(ifmsh
->beacon
);
3497 if (beacon
->csa_counter_offsets
[0]) {
3499 /* TODO: For mesh csa_counter is in TU, so
3500 * decrementing it by one isn't correct, but
3501 * for now we leave it consistent with overall
3502 * mac80211's behavior.
3504 __ieee80211_csa_update_counter(beacon
);
3506 ieee80211_set_csa(sdata
, beacon
);
3509 if (ifmsh
->sync_ops
)
3510 ifmsh
->sync_ops
->adjust_tbtt(sdata
, beacon
);
3512 skb
= dev_alloc_skb(local
->tx_headroom
+
3516 local
->hw
.extra_beacon_tailroom
);
3519 skb_reserve(skb
, local
->tx_headroom
);
3520 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
3522 ieee80211_beacon_add_tim(sdata
, &ifmsh
->ps
, skb
, is_template
);
3525 offs
->tim_offset
= beacon
->head_len
;
3526 offs
->tim_length
= skb
->len
- beacon
->head_len
;
3529 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
3537 if (offs
&& beacon
) {
3540 for (i
= 0; i
< IEEE80211_MAX_CSA_COUNTERS_NUM
; i
++) {
3541 u16 csa_off
= beacon
->csa_counter_offsets
[i
];
3546 offs
->csa_counter_offs
[i
] = csa_off_base
+ csa_off
;
3550 band
= chanctx_conf
->def
.chan
->band
;
3552 info
= IEEE80211_SKB_CB(skb
);
3554 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
3555 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
3558 memset(&txrc
, 0, sizeof(txrc
));
3560 txrc
.sband
= local
->hw
.wiphy
->bands
[band
];
3561 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
3563 txrc
.reported_rate
.idx
= -1;
3564 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
3565 if (txrc
.rate_idx_mask
== (1 << txrc
.sband
->n_bitrates
) - 1)
3566 txrc
.max_rate_idx
= -1;
3568 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
3570 rate_control_get_rate(sdata
, NULL
, &txrc
);
3572 info
->control
.vif
= vif
;
3574 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
3575 IEEE80211_TX_CTL_ASSIGN_SEQ
|
3576 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
3584 ieee80211_beacon_get_template(struct ieee80211_hw
*hw
,
3585 struct ieee80211_vif
*vif
,
3586 struct ieee80211_mutable_offsets
*offs
)
3588 return __ieee80211_beacon_get(hw
, vif
, offs
, true);
3590 EXPORT_SYMBOL(ieee80211_beacon_get_template
);
3592 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
3593 struct ieee80211_vif
*vif
,
3594 u16
*tim_offset
, u16
*tim_length
)
3596 struct ieee80211_mutable_offsets offs
= {};
3597 struct sk_buff
*bcn
= __ieee80211_beacon_get(hw
, vif
, &offs
, false);
3598 struct sk_buff
*copy
;
3599 struct ieee80211_supported_band
*sband
;
3606 *tim_offset
= offs
.tim_offset
;
3609 *tim_length
= offs
.tim_length
;
3611 if (ieee80211_hw_check(hw
, BEACON_TX_STATUS
) ||
3612 !hw_to_local(hw
)->monitors
)
3615 /* send a copy to monitor interfaces */
3616 copy
= skb_copy(bcn
, GFP_ATOMIC
);
3620 shift
= ieee80211_vif_get_shift(vif
);
3621 sband
= hw
->wiphy
->bands
[ieee80211_get_sdata_band(vif_to_sdata(vif
))];
3622 ieee80211_tx_monitor(hw_to_local(hw
), copy
, sband
, 1, shift
, false);
3626 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
3628 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
3629 struct ieee80211_vif
*vif
)
3631 struct ieee80211_if_ap
*ap
= NULL
;
3632 struct sk_buff
*skb
= NULL
;
3633 struct probe_resp
*presp
= NULL
;
3634 struct ieee80211_hdr
*hdr
;
3635 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
3637 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
3643 presp
= rcu_dereference(ap
->probe_resp
);
3647 skb
= dev_alloc_skb(presp
->len
);
3651 memcpy(skb_put(skb
, presp
->len
), presp
->data
, presp
->len
);
3653 hdr
= (struct ieee80211_hdr
*) skb
->data
;
3654 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
3660 EXPORT_SYMBOL(ieee80211_proberesp_get
);
3662 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
3663 struct ieee80211_vif
*vif
)
3665 struct ieee80211_sub_if_data
*sdata
;
3666 struct ieee80211_if_managed
*ifmgd
;
3667 struct ieee80211_pspoll
*pspoll
;
3668 struct ieee80211_local
*local
;
3669 struct sk_buff
*skb
;
3671 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
3674 sdata
= vif_to_sdata(vif
);
3675 ifmgd
= &sdata
->u
.mgd
;
3676 local
= sdata
->local
;
3678 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
3682 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3684 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
3685 memset(pspoll
, 0, sizeof(*pspoll
));
3686 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
3687 IEEE80211_STYPE_PSPOLL
);
3688 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
3690 /* aid in PS-Poll has its two MSBs each set to 1 */
3691 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
3693 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
3694 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
3698 EXPORT_SYMBOL(ieee80211_pspoll_get
);
3700 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
3701 struct ieee80211_vif
*vif
)
3703 struct ieee80211_hdr_3addr
*nullfunc
;
3704 struct ieee80211_sub_if_data
*sdata
;
3705 struct ieee80211_if_managed
*ifmgd
;
3706 struct ieee80211_local
*local
;
3707 struct sk_buff
*skb
;
3709 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
3712 sdata
= vif_to_sdata(vif
);
3713 ifmgd
= &sdata
->u
.mgd
;
3714 local
= sdata
->local
;
3716 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
3720 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3722 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
3724 memset(nullfunc
, 0, sizeof(*nullfunc
));
3725 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
3726 IEEE80211_STYPE_NULLFUNC
|
3727 IEEE80211_FCTL_TODS
);
3728 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
3729 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
3730 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
3734 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
3736 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
3738 const u8
*ssid
, size_t ssid_len
,
3741 struct ieee80211_local
*local
= hw_to_local(hw
);
3742 struct ieee80211_hdr_3addr
*hdr
;
3743 struct sk_buff
*skb
;
3747 ie_ssid_len
= 2 + ssid_len
;
3749 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
3750 ie_ssid_len
+ tailroom
);
3754 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
3756 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
3757 memset(hdr
, 0, sizeof(*hdr
));
3758 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
3759 IEEE80211_STYPE_PROBE_REQ
);
3760 eth_broadcast_addr(hdr
->addr1
);
3761 memcpy(hdr
->addr2
, src_addr
, ETH_ALEN
);
3762 eth_broadcast_addr(hdr
->addr3
);
3764 pos
= skb_put(skb
, ie_ssid_len
);
3765 *pos
++ = WLAN_EID_SSID
;
3768 memcpy(pos
, ssid
, ssid_len
);
3773 EXPORT_SYMBOL(ieee80211_probereq_get
);
3775 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3776 const void *frame
, size_t frame_len
,
3777 const struct ieee80211_tx_info
*frame_txctl
,
3778 struct ieee80211_rts
*rts
)
3780 const struct ieee80211_hdr
*hdr
= frame
;
3782 rts
->frame_control
=
3783 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
3784 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
3786 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
3787 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
3789 EXPORT_SYMBOL(ieee80211_rts_get
);
3791 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
3792 const void *frame
, size_t frame_len
,
3793 const struct ieee80211_tx_info
*frame_txctl
,
3794 struct ieee80211_cts
*cts
)
3796 const struct ieee80211_hdr
*hdr
= frame
;
3798 cts
->frame_control
=
3799 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
3800 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
3801 frame_len
, frame_txctl
);
3802 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
3804 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
3807 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
3808 struct ieee80211_vif
*vif
)
3810 struct ieee80211_local
*local
= hw_to_local(hw
);
3811 struct sk_buff
*skb
= NULL
;
3812 struct ieee80211_tx_data tx
;
3813 struct ieee80211_sub_if_data
*sdata
;
3815 struct ieee80211_tx_info
*info
;
3816 struct ieee80211_chanctx_conf
*chanctx_conf
;
3818 sdata
= vif_to_sdata(vif
);
3821 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
3826 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
3827 struct beacon_data
*beacon
=
3828 rcu_dereference(sdata
->u
.ap
.beacon
);
3830 if (!beacon
|| !beacon
->head
)
3833 ps
= &sdata
->u
.ap
.ps
;
3834 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
3835 ps
= &sdata
->u
.mesh
.ps
;
3840 if (ps
->dtim_count
!= 0 || !ps
->dtim_bc_mc
)
3841 goto out
; /* send buffered bc/mc only after DTIM beacon */
3844 skb
= skb_dequeue(&ps
->bc_buf
);
3847 local
->total_ps_buffered
--;
3849 if (!skb_queue_empty(&ps
->bc_buf
) && skb
->len
>= 2) {
3850 struct ieee80211_hdr
*hdr
=
3851 (struct ieee80211_hdr
*) skb
->data
;
3852 /* more buffered multicast/broadcast frames ==> set
3853 * MoreData flag in IEEE 802.11 header to inform PS
3855 hdr
->frame_control
|=
3856 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
3859 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
)
3860 sdata
= IEEE80211_DEV_TO_SUB_IF(skb
->dev
);
3861 if (!ieee80211_tx_prepare(sdata
, &tx
, NULL
, skb
))
3863 dev_kfree_skb_any(skb
);
3866 info
= IEEE80211_SKB_CB(skb
);
3868 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
3869 info
->band
= chanctx_conf
->def
.chan
->band
;
3871 if (invoke_tx_handlers(&tx
))
3878 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
3880 int ieee80211_reserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3882 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3883 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3884 struct ieee80211_local
*local
= sdata
->local
;
3888 lockdep_assert_held(&local
->sta_mtx
);
3890 /* only some cases are supported right now */
3891 switch (sdata
->vif
.type
) {
3892 case NL80211_IFTYPE_STATION
:
3893 case NL80211_IFTYPE_AP
:
3894 case NL80211_IFTYPE_AP_VLAN
:
3901 if (WARN_ON(tid
>= IEEE80211_NUM_UPS
))
3904 if (sta
->reserved_tid
== tid
) {
3909 if (sta
->reserved_tid
!= IEEE80211_TID_UNRESERVED
) {
3910 sdata_err(sdata
, "TID reservation already active\n");
3915 ieee80211_stop_vif_queues(sdata
->local
, sdata
,
3916 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3920 /* Tear down BA sessions so we stop aggregating on this TID */
3921 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
)) {
3922 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3923 __ieee80211_stop_tx_ba_session(sta
, tid
,
3924 AGG_STOP_LOCAL_REQUEST
);
3927 queues
= BIT(sdata
->vif
.hw_queue
[ieee802_1d_to_ac
[tid
]]);
3928 __ieee80211_flush_queues(local
, sdata
, queues
, false);
3930 sta
->reserved_tid
= tid
;
3932 ieee80211_wake_vif_queues(local
, sdata
,
3933 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID
);
3935 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
))
3936 clear_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
3942 EXPORT_SYMBOL(ieee80211_reserve_tid
);
3944 void ieee80211_unreserve_tid(struct ieee80211_sta
*pubsta
, u8 tid
)
3946 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
3947 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3949 lockdep_assert_held(&sdata
->local
->sta_mtx
);
3951 /* only some cases are supported right now */
3952 switch (sdata
->vif
.type
) {
3953 case NL80211_IFTYPE_STATION
:
3954 case NL80211_IFTYPE_AP
:
3955 case NL80211_IFTYPE_AP_VLAN
:
3962 if (tid
!= sta
->reserved_tid
) {
3963 sdata_err(sdata
, "TID to unreserve (%d) isn't reserved\n", tid
);
3967 sta
->reserved_tid
= IEEE80211_TID_UNRESERVED
;
3969 EXPORT_SYMBOL(ieee80211_unreserve_tid
);
3971 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data
*sdata
,
3972 struct sk_buff
*skb
, int tid
,
3973 enum ieee80211_band band
)
3975 int ac
= ieee802_1d_to_ac
[tid
& 7];
3977 skb_reset_mac_header(skb
);
3978 skb_reset_network_header(skb
);
3979 skb_reset_transport_header(skb
);
3981 skb_set_queue_mapping(skb
, ac
);
3982 skb
->priority
= tid
;
3984 skb
->dev
= sdata
->dev
;
3987 * The other path calling ieee80211_xmit is from the tasklet,
3988 * and while we can handle concurrent transmissions locking
3989 * requirements are that we do not come into tx with bhs on.
3992 IEEE80211_SKB_CB(skb
)->band
= band
;
3993 ieee80211_xmit(sdata
, NULL
, skb
);