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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
40 struct sk_buff
*skb
, int group_addr
,
43 int rate
, mrate
, erp
, dur
, i
;
44 struct ieee80211_rate
*txrate
;
45 struct ieee80211_local
*local
= tx
->local
;
46 struct ieee80211_supported_band
*sband
;
47 struct ieee80211_hdr
*hdr
;
48 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 /* assume HW handles this */
51 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
55 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
58 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
59 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
61 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr
= (struct ieee80211_hdr
*)skb
->data
;
81 if (ieee80211_is_ctl(hdr
->frame_control
)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr
) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate
= sband
->bitrates
[0].bitrate
;
119 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
120 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
122 if (r
->bitrate
> txrate
->bitrate
)
125 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
128 switch (sband
->band
) {
129 case IEEE80211_BAND_2GHZ
: {
131 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
132 flag
= IEEE80211_RATE_MANDATORY_G
;
134 flag
= IEEE80211_RATE_MANDATORY_B
;
139 case IEEE80211_BAND_5GHZ
:
140 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
143 case IEEE80211_NUM_BANDS
:
149 /* No matching basic rate found; use highest suitable mandatory
154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
156 *(ieee80211_get_qos_ctl(hdr
)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
163 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur
*= 2; /* ACK + SIFS */
170 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
171 txrate
->bitrate
, erp
,
172 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
175 return cpu_to_le16(dur
);
178 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
179 struct net_device
*dev
)
181 return local
== wdev_priv(dev
->ieee80211_ptr
);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
188 struct ieee80211_local
*local
= tx
->local
;
189 struct ieee80211_if_managed
*ifmgd
;
191 /* driver doesn't support power save */
192 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
195 /* hardware does dynamic power save */
196 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
199 /* dynamic power save disabled */
200 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
203 /* we are scanning, don't enable power save */
207 if (!local
->ps_sdata
)
210 /* No point if we're going to suspend */
211 if (local
->quiescing
)
214 /* dynamic ps is supported only in managed mode */
215 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
218 ifmgd
= &tx
->sdata
->u
.mgd
;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: local->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
234 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
235 && skb_get_queue_mapping(tx
->skb
) == 0)
238 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
239 ieee80211_stop_queues_by_reason(&local
->hw
,
240 IEEE80211_QUEUE_STOP_REASON_PS
);
241 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
242 ieee80211_queue_work(&local
->hw
,
243 &local
->dynamic_ps_disable_work
);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd
->associated
)
250 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
251 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
260 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
261 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
264 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
267 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
269 !ieee80211_is_probe_req(hdr
->frame_control
) &&
270 !ieee80211_is_nullfunc(hdr
->frame_control
))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
287 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
290 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
294 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
296 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
297 if (unlikely(!assoc
&&
298 ieee80211_is_data(hdr
->frame_control
))) {
299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 printk(KERN_DEBUG
"%s: dropped data frame to not "
301 "associated station %pM\n",
302 tx
->sdata
->name
, hdr
->addr1
);
303 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
304 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
308 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
309 tx
->local
->num_sta
== 0 &&
310 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
312 * No associated STAs - no need to send multicast
323 /* This function is called whenever the AP is about to exceed the maximum limit
324 * of buffered frames for power saving STAs. This situation should not really
325 * happen often during normal operation, so dropping the oldest buffered packet
326 * from each queue should be OK to make some room for new frames. */
327 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
329 int total
= 0, purged
= 0;
331 struct ieee80211_sub_if_data
*sdata
;
332 struct sta_info
*sta
;
335 * virtual interfaces are protected by RCU
339 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
340 struct ieee80211_if_ap
*ap
;
341 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
344 skb
= skb_dequeue(&ap
->ps_bc_buf
);
349 total
+= skb_queue_len(&ap
->ps_bc_buf
);
353 * Drop one frame from each station from the lowest-priority
354 * AC that has frames at all.
356 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
359 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
360 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
361 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
372 local
->total_ps_buffered
= total
;
373 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
374 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
379 static ieee80211_tx_result
380 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
382 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
383 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
386 * broadcast/multicast frame
388 * If any of the associated stations is in power save mode,
389 * the frame is buffered to be sent after DTIM beacon frame.
390 * This is done either by the hardware or us.
393 /* powersaving STAs only in AP/VLAN mode */
397 /* no buffering for ordered frames */
398 if (ieee80211_has_order(hdr
->frame_control
))
401 /* no stations in PS mode */
402 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
405 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
407 /* device releases frame after DTIM beacon */
408 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
411 /* buffered in mac80211 */
412 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
413 purge_old_ps_buffers(tx
->local
);
415 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
416 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
418 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
421 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
423 tx
->local
->total_ps_buffered
++;
425 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
430 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
433 if (!ieee80211_is_mgmt(fc
))
436 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
439 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
446 static ieee80211_tx_result
447 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
449 struct sta_info
*sta
= tx
->sta
;
450 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
451 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
452 struct ieee80211_local
*local
= tx
->local
;
455 ieee80211_is_probe_resp(hdr
->frame_control
) ||
456 ieee80211_is_auth(hdr
->frame_control
) ||
457 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
458 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
461 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
462 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
463 !(info
->flags
& IEEE80211_TX_CTL_POLL_RESPONSE
))) {
464 int ac
= skb_get_queue_mapping(tx
->skb
);
466 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
467 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer for AC %d\n",
468 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
469 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
470 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
471 purge_old_ps_buffers(tx
->local
);
472 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
473 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
474 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
476 printk(KERN_DEBUG
"%s: STA %pM TX buffer for "
477 "AC %d full - dropping oldest frame\n",
478 tx
->sdata
->name
, sta
->sta
.addr
, ac
);
482 tx
->local
->total_ps_buffered
++;
484 info
->control
.jiffies
= jiffies
;
485 info
->control
.vif
= &tx
->sdata
->vif
;
486 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
487 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
489 if (!timer_pending(&local
->sta_cleanup
))
490 mod_timer(&local
->sta_cleanup
,
491 round_jiffies(jiffies
+
492 STA_INFO_CLEANUP_INTERVAL
));
495 * We queued up some frames, so the TIM bit might
496 * need to be set, recalculate it.
498 sta_info_recalc_tim(sta
);
502 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
503 else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
505 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
506 tx
->sdata
->name
, sta
->sta
.addr
);
508 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
513 static ieee80211_tx_result debug_noinline
514 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
516 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
519 if (tx
->flags
& IEEE80211_TX_UNICAST
)
520 return ieee80211_tx_h_unicast_ps_buf(tx
);
522 return ieee80211_tx_h_multicast_ps_buf(tx
);
525 static ieee80211_tx_result debug_noinline
526 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
528 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
530 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
531 tx
->sdata
->control_port_no_encrypt
))
532 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
537 static ieee80211_tx_result debug_noinline
538 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
540 struct ieee80211_key
*key
= NULL
;
541 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
542 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
544 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
546 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
548 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
549 is_multicast_ether_addr(hdr
->addr1
) &&
550 ieee80211_is_robust_mgmt_frame(hdr
) &&
551 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
553 else if (is_multicast_ether_addr(hdr
->addr1
) &&
554 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
556 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
557 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
559 else if (tx
->sdata
->drop_unencrypted
&&
560 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
561 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
562 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
563 (ieee80211_is_action(hdr
->frame_control
) &&
564 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
565 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
571 bool skip_hw
= false;
573 tx
->key
->tx_rx_count
++;
574 /* TODO: add threshold stuff again */
576 switch (tx
->key
->conf
.cipher
) {
577 case WLAN_CIPHER_SUITE_WEP40
:
578 case WLAN_CIPHER_SUITE_WEP104
:
579 case WLAN_CIPHER_SUITE_TKIP
:
580 if (!ieee80211_is_data_present(hdr
->frame_control
))
583 case WLAN_CIPHER_SUITE_CCMP
:
584 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
585 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
589 skip_hw
= (tx
->key
->conf
.flags
&
590 IEEE80211_KEY_FLAG_SW_MGMT
) &&
591 ieee80211_is_mgmt(hdr
->frame_control
);
593 case WLAN_CIPHER_SUITE_AES_CMAC
:
594 if (!ieee80211_is_mgmt(hdr
->frame_control
))
599 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
602 if (!skip_hw
&& tx
->key
&&
603 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
604 info
->control
.hw_key
= &tx
->key
->conf
;
610 static ieee80211_tx_result debug_noinline
611 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
613 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
614 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
615 struct ieee80211_supported_band
*sband
;
616 struct ieee80211_rate
*rate
;
619 bool inval
= false, rts
= false, short_preamble
= false;
620 struct ieee80211_tx_rate_control txrc
;
623 memset(&txrc
, 0, sizeof(txrc
));
625 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
627 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
628 tx
->local
->hw
.wiphy
->frag_threshold
);
630 /* set up the tx rate control struct we give the RC algo */
631 txrc
.hw
= local_to_hw(tx
->local
);
633 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
635 txrc
.reported_rate
.idx
= -1;
636 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
637 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
638 txrc
.max_rate_idx
= -1;
640 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
641 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
642 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
643 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
645 /* set up RTS protection if desired */
646 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
647 txrc
.rts
= rts
= true;
651 * Use short preamble if the BSS can handle it, but not for
652 * management frames unless we know the receiver can handle
653 * that -- the management frame might be to a station that
654 * just wants a probe response.
656 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
657 (ieee80211_is_data(hdr
->frame_control
) ||
658 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
659 txrc
.short_preamble
= short_preamble
= true;
662 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
665 * Lets not bother rate control if we're associated and cannot
666 * talk to the sta. This should not happen.
668 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
669 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
670 "%s: Dropped data frame as no usable bitrate found while "
671 "scanning and associated. Target station: "
672 "%pM on %d GHz band\n",
673 tx
->sdata
->name
, hdr
->addr1
,
674 tx
->channel
->band
? 5 : 2))
678 * If we're associated with the sta at this point we know we can at
679 * least send the frame at the lowest bit rate.
681 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
683 if (unlikely(info
->control
.rates
[0].idx
< 0))
686 if (txrc
.reported_rate
.idx
< 0) {
687 txrc
.reported_rate
= info
->control
.rates
[0];
688 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
689 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
691 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
693 if (unlikely(!info
->control
.rates
[0].count
))
694 info
->control
.rates
[0].count
= 1;
696 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
697 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
698 info
->control
.rates
[0].count
= 1;
700 if (is_multicast_ether_addr(hdr
->addr1
)) {
702 * XXX: verify the rate is in the basic rateset
708 * set up the RTS/CTS rate as the fastest basic rate
709 * that is not faster than the data rate
711 * XXX: Should this check all retry rates?
713 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
716 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
718 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
719 /* must be a basic rate */
720 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
722 /* must not be faster than the data rate */
723 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
726 if (sband
->bitrates
[baserate
].bitrate
<
727 sband
->bitrates
[i
].bitrate
)
731 info
->control
.rts_cts_rate_idx
= baserate
;
734 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
736 * make sure there's no valid rate following
737 * an invalid one, just in case drivers don't
738 * take the API seriously to stop at -1.
741 info
->control
.rates
[i
].idx
= -1;
744 if (info
->control
.rates
[i
].idx
< 0) {
750 * For now assume MCS is already set up correctly, this
753 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
754 WARN_ON(info
->control
.rates
[i
].idx
> 76);
758 /* set up RTS protection if desired */
760 info
->control
.rates
[i
].flags
|=
761 IEEE80211_TX_RC_USE_RTS_CTS
;
764 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
765 sband
->n_bitrates
)) {
766 info
->control
.rates
[i
].idx
= -1;
770 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
772 /* set up short preamble */
773 if (short_preamble
&&
774 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
775 info
->control
.rates
[i
].flags
|=
776 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
778 /* set up G protection */
779 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
780 rate
->flags
& IEEE80211_RATE_ERP_G
)
781 info
->control
.rates
[i
].flags
|=
782 IEEE80211_TX_RC_USE_CTS_PROTECT
;
788 static ieee80211_tx_result debug_noinline
789 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
791 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
792 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
798 * Packet injection may want to control the sequence
799 * number, if we have no matching interface then we
800 * neither assign one ourselves nor ask the driver to.
802 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
805 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
808 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
811 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
815 * Anything but QoS data that has a sequence number field
816 * (is long enough) gets a sequence number from the global
819 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
820 /* driver should assign sequence number */
821 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
822 /* for pure STA mode without beacons, we can do it */
823 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
824 tx
->sdata
->sequence_number
+= 0x10;
829 * This should be true for injected/management frames only, for
830 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
831 * above since they are not QoS-data frames.
836 /* include per-STA, per-TID sequence counter */
838 qc
= ieee80211_get_qos_ctl(hdr
);
839 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
840 seq
= &tx
->sta
->tid_seq
[tid
];
842 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
844 /* Increase the sequence number. */
845 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
850 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
851 struct sk_buff
*skb
, int hdrlen
,
854 struct ieee80211_local
*local
= tx
->local
;
855 struct ieee80211_tx_info
*info
;
857 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
858 int pos
= hdrlen
+ per_fragm
;
859 int rem
= skb
->len
- hdrlen
- per_fragm
;
861 if (WARN_ON(rem
< 0))
864 /* first fragment was already added to queue by caller */
867 int fraglen
= per_fragm
;
872 tmp
= dev_alloc_skb(local
->tx_headroom
+
874 IEEE80211_ENCRYPT_HEADROOM
+
875 IEEE80211_ENCRYPT_TAILROOM
);
879 __skb_queue_tail(&tx
->skbs
, tmp
);
881 skb_reserve(tmp
, local
->tx_headroom
+
882 IEEE80211_ENCRYPT_HEADROOM
);
883 /* copy control information */
884 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
886 info
= IEEE80211_SKB_CB(tmp
);
887 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
888 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
891 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
893 skb_copy_queue_mapping(tmp
, skb
);
894 tmp
->priority
= skb
->priority
;
897 /* copy header and data */
898 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
899 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
904 /* adjust first fragment's length */
905 skb
->len
= hdrlen
+ per_fragm
;
909 static ieee80211_tx_result debug_noinline
910 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
912 struct sk_buff
*skb
= tx
->skb
;
913 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
914 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
915 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
919 /* no matter what happens, tx->skb moves to tx->skbs */
920 __skb_queue_tail(&tx
->skbs
, skb
);
923 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
926 if (tx
->local
->ops
->set_frag_threshold
)
930 * Warn when submitting a fragmented A-MPDU frame and drop it.
931 * This scenario is handled in ieee80211_tx_prepare but extra
932 * caution taken here as fragmented ampdu may cause Tx stop.
934 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
937 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
939 /* internal error, why isn't DONTFRAG set? */
940 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
944 * Now fragment the frame. This will allocate all the fragments and
945 * chain them (using skb as the first fragment) to skb->next.
946 * During transmission, we will remove the successfully transmitted
947 * fragments from this list. When the low-level driver rejects one
948 * of the fragments then we will simply pretend to accept the skb
949 * but store it away as pending.
951 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
954 /* update duration/seq/flags of fragments */
957 skb_queue_walk(&tx
->skbs
, skb
) {
959 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
961 hdr
= (void *)skb
->data
;
962 info
= IEEE80211_SKB_CB(skb
);
964 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
965 hdr
->frame_control
|= morefrags
;
967 * No multi-rate retries for fragmented frames, that
968 * would completely throw off the NAV at other STAs.
970 info
->control
.rates
[1].idx
= -1;
971 info
->control
.rates
[2].idx
= -1;
972 info
->control
.rates
[3].idx
= -1;
973 info
->control
.rates
[4].idx
= -1;
974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
975 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
977 hdr
->frame_control
&= ~morefrags
;
980 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
987 static ieee80211_tx_result debug_noinline
988 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
995 tx
->sta
->tx_packets
++;
996 skb_queue_walk(&tx
->skbs
, skb
) {
997 tx
->sta
->tx_fragments
++;
998 tx
->sta
->tx_bytes
+= skb
->len
;
1004 static ieee80211_tx_result debug_noinline
1005 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1007 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1012 switch (tx
->key
->conf
.cipher
) {
1013 case WLAN_CIPHER_SUITE_WEP40
:
1014 case WLAN_CIPHER_SUITE_WEP104
:
1015 return ieee80211_crypto_wep_encrypt(tx
);
1016 case WLAN_CIPHER_SUITE_TKIP
:
1017 return ieee80211_crypto_tkip_encrypt(tx
);
1018 case WLAN_CIPHER_SUITE_CCMP
:
1019 return ieee80211_crypto_ccmp_encrypt(tx
);
1020 case WLAN_CIPHER_SUITE_AES_CMAC
:
1021 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1023 /* handle hw-only algorithm */
1024 if (info
->control
.hw_key
) {
1025 ieee80211_tx_set_protected(tx
);
1035 static ieee80211_tx_result debug_noinline
1036 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1038 struct sk_buff
*skb
;
1039 struct ieee80211_hdr
*hdr
;
1043 skb_queue_walk(&tx
->skbs
, skb
) {
1044 hdr
= (void *) skb
->data
;
1045 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1046 break; /* must not overwrite AID */
1047 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1048 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1049 next_len
= next
->len
;
1052 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1055 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1061 /* actual transmit path */
1063 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1064 struct sk_buff
*skb
,
1065 struct ieee80211_tx_info
*info
,
1066 struct tid_ampdu_tx
*tid_tx
,
1069 bool queued
= false;
1070 bool reset_agg_timer
= false;
1072 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1073 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1074 reset_agg_timer
= true;
1075 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1077 * nothing -- this aggregation session is being started
1078 * but that might still fail with the driver
1081 spin_lock(&tx
->sta
->lock
);
1083 * Need to re-check now, because we may get here
1085 * 1) in the window during which the setup is actually
1086 * already done, but not marked yet because not all
1087 * packets are spliced over to the driver pending
1088 * queue yet -- if this happened we acquire the lock
1089 * either before or after the splice happens, but
1090 * need to recheck which of these cases happened.
1092 * 2) during session teardown, if the OPERATIONAL bit
1093 * was cleared due to the teardown but the pointer
1094 * hasn't been assigned NULL yet (or we loaded it
1095 * before it was assigned) -- in this case it may
1096 * now be NULL which means we should just let the
1097 * packet pass through because splicing the frames
1098 * back is already done.
1100 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1103 /* do nothing, let packet pass through */
1104 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1105 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1106 reset_agg_timer
= true;
1109 info
->control
.vif
= &tx
->sdata
->vif
;
1110 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1111 __skb_queue_tail(&tid_tx
->pending
, skb
);
1113 spin_unlock(&tx
->sta
->lock
);
1116 /* reset session timer */
1117 if (reset_agg_timer
&& tid_tx
->timeout
)
1118 mod_timer(&tid_tx
->session_timer
,
1119 TU_TO_EXP_TIME(tid_tx
->timeout
));
1127 static ieee80211_tx_result
1128 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1129 struct ieee80211_tx_data
*tx
,
1130 struct sk_buff
*skb
)
1132 struct ieee80211_local
*local
= sdata
->local
;
1133 struct ieee80211_hdr
*hdr
;
1134 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1138 memset(tx
, 0, sizeof(*tx
));
1142 tx
->channel
= local
->hw
.conf
.channel
;
1143 __skb_queue_head_init(&tx
->skbs
);
1146 * If this flag is set to true anywhere, and we get here,
1147 * we are doing the needed processing, so remove the flag
1150 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1152 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1154 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1155 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1156 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1158 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1159 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1162 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1164 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1165 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1166 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1167 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1168 struct tid_ampdu_tx
*tid_tx
;
1170 qc
= ieee80211_get_qos_ctl(hdr
);
1171 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1173 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1177 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1180 if (unlikely(queued
))
1185 if (is_multicast_ether_addr(hdr
->addr1
)) {
1186 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1187 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1189 tx
->flags
|= IEEE80211_TX_UNICAST
;
1191 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1192 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1193 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1194 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1195 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1199 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1200 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1201 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1203 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1208 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1209 struct ieee80211_vif
*vif
,
1210 struct ieee80211_sta
*sta
,
1211 struct sk_buff_head
*skbs
,
1214 struct sk_buff
*skb
, *tmp
;
1215 struct ieee80211_tx_info
*info
;
1216 unsigned long flags
;
1218 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1219 int q
= skb_get_queue_mapping(skb
);
1221 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1222 if (local
->queue_stop_reasons
[q
] ||
1223 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1225 * Since queue is stopped, queue up frames for later
1226 * transmission from the tx-pending tasklet when the
1227 * queue is woken again.
1230 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1232 skb_queue_splice_tail_init(skbs
,
1233 &local
->pending
[q
]);
1235 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1239 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1241 info
= IEEE80211_SKB_CB(skb
);
1242 info
->control
.vif
= vif
;
1243 info
->control
.sta
= sta
;
1245 __skb_unlink(skb
, skbs
);
1253 * Returns false if the frame couldn't be transmitted but was queued instead.
1255 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1256 struct sk_buff_head
*skbs
, int led_len
,
1257 struct sta_info
*sta
, bool txpending
)
1259 struct ieee80211_tx_info
*info
;
1260 struct ieee80211_sub_if_data
*sdata
;
1261 struct ieee80211_vif
*vif
;
1262 struct ieee80211_sta
*pubsta
;
1263 struct sk_buff
*skb
;
1267 if (WARN_ON(skb_queue_empty(skbs
)))
1270 skb
= skb_peek(skbs
);
1271 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1272 info
= IEEE80211_SKB_CB(skb
);
1273 sdata
= vif_to_sdata(info
->control
.vif
);
1274 if (sta
&& !sta
->uploaded
)
1282 switch (sdata
->vif
.type
) {
1283 case NL80211_IFTYPE_MONITOR
:
1287 case NL80211_IFTYPE_AP_VLAN
:
1288 sdata
= container_of(sdata
->bss
,
1289 struct ieee80211_sub_if_data
, u
.ap
);
1296 if (local
->ops
->tx_frags
)
1297 drv_tx_frags(local
, vif
, pubsta
, skbs
);
1299 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1302 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1303 ieee80211_led_tx(local
, 1);
1305 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1311 * Invoke TX handlers, return 0 on success and non-zero if the
1312 * frame was dropped or queued.
1314 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1316 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1317 ieee80211_tx_result res
= TX_DROP
;
1319 #define CALL_TXH(txh) \
1322 if (res != TX_CONTINUE) \
1326 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1327 CALL_TXH(ieee80211_tx_h_check_assoc
);
1328 CALL_TXH(ieee80211_tx_h_ps_buf
);
1329 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1330 CALL_TXH(ieee80211_tx_h_select_key
);
1331 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1332 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1334 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1335 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1340 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1341 CALL_TXH(ieee80211_tx_h_sequence
);
1342 CALL_TXH(ieee80211_tx_h_fragment
);
1343 /* handlers after fragment must be aware of tx info fragmentation! */
1344 CALL_TXH(ieee80211_tx_h_stats
);
1345 CALL_TXH(ieee80211_tx_h_encrypt
);
1346 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1347 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1351 if (unlikely(res
== TX_DROP
)) {
1352 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1354 dev_kfree_skb(tx
->skb
);
1356 __skb_queue_purge(&tx
->skbs
);
1358 } else if (unlikely(res
== TX_QUEUED
)) {
1359 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1367 * Returns false if the frame couldn't be transmitted but was queued instead.
1369 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1370 struct sk_buff
*skb
, bool txpending
)
1372 struct ieee80211_local
*local
= sdata
->local
;
1373 struct ieee80211_tx_data tx
;
1374 ieee80211_tx_result res_prepare
;
1375 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1379 if (unlikely(skb
->len
< 10)) {
1386 /* initialises tx */
1388 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1390 if (unlikely(res_prepare
== TX_DROP
)) {
1393 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1397 tx
.channel
= local
->hw
.conf
.channel
;
1398 info
->band
= tx
.channel
->band
;
1400 if (!invoke_tx_handlers(&tx
))
1401 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1408 /* device xmit handlers */
1410 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1411 struct sk_buff
*skb
,
1412 int head_need
, bool may_encrypt
)
1414 struct ieee80211_local
*local
= sdata
->local
;
1417 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1418 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1419 tail_need
-= skb_tailroom(skb
);
1420 tail_need
= max_t(int, tail_need
, 0);
1423 if (skb_cloned(skb
))
1424 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1425 else if (head_need
|| tail_need
)
1426 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1430 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1431 wiphy_debug(local
->hw
.wiphy
,
1432 "failed to reallocate TX buffer\n");
1439 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1441 struct ieee80211_local
*local
= sdata
->local
;
1442 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1443 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1449 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1451 headroom
= local
->tx_headroom
;
1453 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1454 headroom
-= skb_headroom(skb
);
1455 headroom
= max_t(int, 0, headroom
);
1457 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1463 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1464 info
->control
.vif
= &sdata
->vif
;
1466 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1467 ieee80211_is_data(hdr
->frame_control
) &&
1468 !is_multicast_ether_addr(hdr
->addr1
))
1469 if (mesh_nexthop_resolve(skb
, sdata
)) {
1470 /* skb queued: don't free */
1475 ieee80211_set_qos_hdr(sdata
, skb
);
1476 ieee80211_tx(sdata
, skb
, false);
1480 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1482 struct ieee80211_radiotap_iterator iterator
;
1483 struct ieee80211_radiotap_header
*rthdr
=
1484 (struct ieee80211_radiotap_header
*) skb
->data
;
1485 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1486 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1490 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1491 IEEE80211_TX_CTL_DONTFRAG
;
1494 * for every radiotap entry that is present
1495 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1496 * entries present, or -EINVAL on error)
1500 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1505 /* see if this argument is something we can use */
1506 switch (iterator
.this_arg_index
) {
1508 * You must take care when dereferencing iterator.this_arg
1509 * for multibyte types... the pointer is not aligned. Use
1510 * get_unaligned((type *)iterator.this_arg) to dereference
1511 * iterator.this_arg for type "type" safely on all arches.
1513 case IEEE80211_RADIOTAP_FLAGS
:
1514 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1516 * this indicates that the skb we have been
1517 * handed has the 32-bit FCS CRC at the end...
1518 * we should react to that by snipping it off
1519 * because it will be recomputed and added
1522 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1525 skb_trim(skb
, skb
->len
- FCS_LEN
);
1527 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1528 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1529 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1530 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1533 case IEEE80211_RADIOTAP_TX_FLAGS
:
1534 txflags
= get_unaligned_le16(iterator
.this_arg
);
1535 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1536 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1540 * Please update the file
1541 * Documentation/networking/mac80211-injection.txt
1542 * when parsing new fields here.
1550 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1554 * remove the radiotap header
1555 * iterator->_max_length was sanity-checked against
1556 * skb->len by iterator init
1558 skb_pull(skb
, iterator
._max_length
);
1563 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1564 struct net_device
*dev
)
1566 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1567 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1568 struct ieee80211_radiotap_header
*prthdr
=
1569 (struct ieee80211_radiotap_header
*)skb
->data
;
1570 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1571 struct ieee80211_hdr
*hdr
;
1572 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1577 * Frame injection is not allowed if beaconing is not allowed
1578 * or if we need radar detection. Beaconing is usually not allowed when
1579 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1580 * Passive scan is also used in world regulatory domains where
1581 * your country is not known and as such it should be treated as
1582 * NO TX unless the channel is explicitly allowed in which case
1583 * your current regulatory domain would not have the passive scan
1586 * Since AP mode uses monitor interfaces to inject/TX management
1587 * frames we can make AP mode the exception to this rule once it
1588 * supports radar detection as its implementation can deal with
1589 * radar detection by itself. We can do that later by adding a
1590 * monitor flag interfaces used for AP support.
1592 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1593 IEEE80211_CHAN_PASSIVE_SCAN
)))
1596 /* check for not even having the fixed radiotap header part */
1597 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1598 goto fail
; /* too short to be possibly valid */
1600 /* is it a header version we can trust to find length from? */
1601 if (unlikely(prthdr
->it_version
))
1602 goto fail
; /* only version 0 is supported */
1604 /* then there must be a radiotap header with a length we can use */
1605 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1607 /* does the skb contain enough to deliver on the alleged length? */
1608 if (unlikely(skb
->len
< len_rthdr
))
1609 goto fail
; /* skb too short for claimed rt header extent */
1612 * fix up the pointers accounting for the radiotap
1613 * header still being in there. We are being given
1614 * a precooked IEEE80211 header so no need for
1617 skb_set_mac_header(skb
, len_rthdr
);
1619 * these are just fixed to the end of the rt area since we
1620 * don't have any better information and at this point, nobody cares
1622 skb_set_network_header(skb
, len_rthdr
);
1623 skb_set_transport_header(skb
, len_rthdr
);
1625 if (skb
->len
< len_rthdr
+ 2)
1628 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1629 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1631 if (skb
->len
< len_rthdr
+ hdrlen
)
1635 * Initialize skb->protocol if the injected frame is a data frame
1636 * carrying a rfc1042 header
1638 if (ieee80211_is_data(hdr
->frame_control
) &&
1639 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1640 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1642 if (compare_ether_addr(payload
, rfc1042_header
) == 0)
1643 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1647 memset(info
, 0, sizeof(*info
));
1649 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1650 IEEE80211_TX_CTL_INJECTED
;
1652 /* process and remove the injection radiotap header */
1653 if (!ieee80211_parse_tx_radiotap(skb
))
1659 * We process outgoing injected frames that have a local address
1660 * we handle as though they are non-injected frames.
1661 * This code here isn't entirely correct, the local MAC address
1662 * isn't always enough to find the interface to use; for proper
1663 * VLAN/WDS support we will need a different mechanism (which
1664 * likely isn't going to be monitor interfaces).
1666 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1668 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1669 if (!ieee80211_sdata_running(tmp_sdata
))
1671 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1672 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1673 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1675 if (compare_ether_addr(tmp_sdata
->vif
.addr
, hdr
->addr2
) == 0) {
1681 ieee80211_xmit(sdata
, skb
);
1684 return NETDEV_TX_OK
;
1688 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1692 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1693 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1694 * @skb: packet to be sent
1695 * @dev: incoming interface
1697 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1698 * not be freed, and caller is responsible for either retrying later or freeing
1701 * This function takes in an Ethernet header and encapsulates it with suitable
1702 * IEEE 802.11 header based on which interface the packet is coming in. The
1703 * encapsulated packet will then be passed to master interface, wlan#.11, for
1704 * transmission (through low-level driver).
1706 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1707 struct net_device
*dev
)
1709 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1710 struct ieee80211_local
*local
= sdata
->local
;
1711 struct ieee80211_tx_info
*info
;
1712 int ret
= NETDEV_TX_BUSY
, head_need
;
1713 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1715 struct ieee80211_hdr hdr
;
1716 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1717 struct mesh_path __maybe_unused
*mppath
= NULL
;
1718 const u8
*encaps_data
;
1719 int encaps_len
, skip_header_bytes
;
1721 struct sta_info
*sta
= NULL
;
1722 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1723 bool tdls_direct
= false;
1728 if (unlikely(skb
->len
< ETH_HLEN
)) {
1733 /* convert Ethernet header to proper 802.11 header (based on
1734 * operation mode) */
1735 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1736 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1738 switch (sdata
->vif
.type
) {
1739 case NL80211_IFTYPE_AP_VLAN
:
1741 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1743 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1745 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1746 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1747 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1748 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1750 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1751 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1757 case NL80211_IFTYPE_AP
:
1758 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1760 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1761 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1762 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1765 case NL80211_IFTYPE_WDS
:
1766 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1768 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1769 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1770 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1771 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1774 #ifdef CONFIG_MAC80211_MESH
1775 case NL80211_IFTYPE_MESH_POINT
:
1776 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1777 /* Do not send frames with mesh_ttl == 0 */
1778 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1783 if (!is_multicast_ether_addr(skb
->data
))
1784 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1787 * Use address extension if it is a packet from
1788 * another interface or if we know the destination
1789 * is being proxied by a portal (i.e. portal address
1790 * differs from proxied address)
1792 if (compare_ether_addr(sdata
->vif
.addr
,
1793 skb
->data
+ ETH_ALEN
) == 0 &&
1794 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1795 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1796 skb
->data
, skb
->data
+ ETH_ALEN
);
1798 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1801 int is_mesh_mcast
= 1;
1804 if (is_multicast_ether_addr(skb
->data
))
1805 /* DA TA mSA AE:SA */
1806 mesh_da
= skb
->data
;
1808 static const u8 bcast
[ETH_ALEN
] =
1809 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1811 /* RA TA mDA mSA AE:DA SA */
1812 mesh_da
= mppath
->mpp
;
1815 /* DA TA mSA AE:SA */
1819 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1820 mesh_da
, sdata
->vif
.addr
);
1824 ieee80211_new_mesh_header(&mesh_hdr
,
1826 skb
->data
+ ETH_ALEN
,
1830 ieee80211_new_mesh_header(&mesh_hdr
,
1833 skb
->data
+ ETH_ALEN
);
1838 case NL80211_IFTYPE_STATION
:
1839 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1840 bool tdls_peer
= false;
1843 sta
= sta_info_get(sdata
, skb
->data
);
1845 authorized
= test_sta_flag(sta
,
1846 WLAN_STA_AUTHORIZED
);
1847 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1848 tdls_peer
= test_sta_flag(sta
,
1849 WLAN_STA_TDLS_PEER
);
1850 tdls_auth
= test_sta_flag(sta
,
1851 WLAN_STA_TDLS_PEER_AUTH
);
1856 * If the TDLS link is enabled, send everything
1857 * directly. Otherwise, allow TDLS setup frames
1858 * to be transmitted indirectly.
1860 tdls_direct
= tdls_peer
&& (tdls_auth
||
1861 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1862 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1866 /* link during setup - throw out frames to peer */
1873 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1874 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1875 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1877 } else if (sdata
->u
.mgd
.use_4addr
&&
1878 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1879 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1880 IEEE80211_FCTL_TODS
);
1882 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1883 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1884 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1885 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1888 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1890 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1891 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1892 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1896 case NL80211_IFTYPE_ADHOC
:
1898 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1899 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1900 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1909 * There's no need to try to look up the destination
1910 * if it is a multicast address (which can only happen
1913 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1916 sta
= sta_info_get(sdata
, hdr
.addr1
);
1918 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1919 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1924 /* For mesh, the use of the QoS header is mandatory */
1925 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1928 /* receiver and we are QoS enabled, use a QoS type frame */
1929 if (wme_sta
&& local
->hw
.queues
>= 4) {
1930 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1935 * Drop unicast frames to unauthorised stations unless they are
1936 * EAPOL frames from the local station.
1938 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1939 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1940 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1941 compare_ether_addr(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1943 if (net_ratelimit())
1944 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1945 " (unauthorized port)\n", dev
->name
,
1949 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1955 if (unlikely(!multicast
&& skb
->sk
&&
1956 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1957 struct sk_buff
*orig_skb
= skb
;
1959 skb
= skb_clone(skb
, GFP_ATOMIC
);
1961 unsigned long flags
;
1964 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1965 r
= idr_get_new_above(&local
->ack_status_frames
,
1968 idr_pre_get(&local
->ack_status_frames
,
1970 r
= idr_get_new_above(&local
->ack_status_frames
,
1973 if (WARN_ON(!id
) || id
> 0xffff) {
1974 idr_remove(&local
->ack_status_frames
, id
);
1977 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1981 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1982 } else if (skb_shared(skb
)) {
1983 kfree_skb(orig_skb
);
1989 /* couldn't clone -- lose tx status ... */
1995 * If the skb is shared we need to obtain our own copy.
1997 if (skb_shared(skb
)) {
1998 struct sk_buff
*tmp_skb
= skb
;
2000 /* can't happen -- skb is a clone if info_id != 0 */
2003 skb
= skb_clone(skb
, GFP_ATOMIC
);
2012 hdr
.frame_control
= fc
;
2013 hdr
.duration_id
= 0;
2016 skip_header_bytes
= ETH_HLEN
;
2017 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2018 encaps_data
= bridge_tunnel_header
;
2019 encaps_len
= sizeof(bridge_tunnel_header
);
2020 skip_header_bytes
-= 2;
2021 } else if (ethertype
>= 0x600) {
2022 encaps_data
= rfc1042_header
;
2023 encaps_len
= sizeof(rfc1042_header
);
2024 skip_header_bytes
-= 2;
2030 nh_pos
= skb_network_header(skb
) - skb
->data
;
2031 h_pos
= skb_transport_header(skb
) - skb
->data
;
2033 skb_pull(skb
, skip_header_bytes
);
2034 nh_pos
-= skip_header_bytes
;
2035 h_pos
-= skip_header_bytes
;
2037 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2040 * So we need to modify the skb header and hence need a copy of
2041 * that. The head_need variable above doesn't, so far, include
2042 * the needed header space that we don't need right away. If we
2043 * can, then we don't reallocate right now but only after the
2044 * frame arrives at the master device (if it does...)
2046 * If we cannot, however, then we will reallocate to include all
2047 * the ever needed space. Also, if we need to reallocate it anyway,
2048 * make it big enough for everything we may ever need.
2051 if (head_need
> 0 || skb_cloned(skb
)) {
2052 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2053 head_need
+= local
->tx_headroom
;
2054 head_need
= max_t(int, 0, head_need
);
2055 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2060 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2061 nh_pos
+= encaps_len
;
2062 h_pos
+= encaps_len
;
2065 #ifdef CONFIG_MAC80211_MESH
2066 if (meshhdrlen
> 0) {
2067 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2068 nh_pos
+= meshhdrlen
;
2069 h_pos
+= meshhdrlen
;
2073 if (ieee80211_is_data_qos(fc
)) {
2074 __le16
*qos_control
;
2076 qos_control
= (__le16
*) skb_push(skb
, 2);
2077 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2079 * Maybe we could actually set some fields here, for now just
2080 * initialise to zero to indicate no special operation.
2084 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2089 dev
->stats
.tx_packets
++;
2090 dev
->stats
.tx_bytes
+= skb
->len
;
2092 /* Update skb pointers to various headers since this modified frame
2093 * is going to go through Linux networking code that may potentially
2094 * need things like pointer to IP header. */
2095 skb_set_mac_header(skb
, 0);
2096 skb_set_network_header(skb
, nh_pos
);
2097 skb_set_transport_header(skb
, h_pos
);
2099 info
= IEEE80211_SKB_CB(skb
);
2100 memset(info
, 0, sizeof(*info
));
2102 dev
->trans_start
= jiffies
;
2104 info
->flags
= info_flags
;
2105 info
->ack_frame_id
= info_id
;
2107 ieee80211_xmit(sdata
, skb
);
2109 return NETDEV_TX_OK
;
2112 if (ret
== NETDEV_TX_OK
)
2120 * ieee80211_clear_tx_pending may not be called in a context where
2121 * it is possible that it packets could come in again.
2123 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2127 for (i
= 0; i
< local
->hw
.queues
; i
++)
2128 skb_queue_purge(&local
->pending
[i
]);
2132 * Returns false if the frame couldn't be transmitted but was queued instead,
2133 * which in this case means re-queued -- take as an indication to stop sending
2134 * more pending frames.
2136 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2137 struct sk_buff
*skb
)
2139 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2140 struct ieee80211_sub_if_data
*sdata
;
2141 struct sta_info
*sta
;
2142 struct ieee80211_hdr
*hdr
;
2145 sdata
= vif_to_sdata(info
->control
.vif
);
2147 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2148 result
= ieee80211_tx(sdata
, skb
, true);
2150 struct sk_buff_head skbs
;
2152 __skb_queue_head_init(&skbs
);
2153 __skb_queue_tail(&skbs
, skb
);
2155 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2156 sta
= sta_info_get(sdata
, hdr
->addr1
);
2158 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2165 * Transmit all pending packets. Called from tasklet.
2167 void ieee80211_tx_pending(unsigned long data
)
2169 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2170 struct ieee80211_sub_if_data
*sdata
;
2171 unsigned long flags
;
2177 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2178 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2180 * If queue is stopped by something other than due to pending
2181 * frames, or we have no pending frames, proceed to next queue.
2183 if (local
->queue_stop_reasons
[i
] ||
2184 skb_queue_empty(&local
->pending
[i
]))
2187 while (!skb_queue_empty(&local
->pending
[i
])) {
2188 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2189 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2191 if (WARN_ON(!info
->control
.vif
)) {
2196 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2199 txok
= ieee80211_tx_pending_skb(local
, skb
);
2200 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2206 if (skb_queue_empty(&local
->pending
[i
]))
2207 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2208 netif_wake_subqueue(sdata
->dev
, i
);
2210 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2215 /* functions for drivers to get certain frames */
2217 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2218 struct sk_buff
*skb
,
2219 struct beacon_data
*beacon
)
2223 int i
, have_bits
= 0, n1
, n2
;
2225 /* Generate bitmap for TIM only if there are any STAs in power save
2227 if (atomic_read(&bss
->num_sta_ps
) > 0)
2228 /* in the hope that this is faster than
2229 * checking byte-for-byte */
2230 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2231 IEEE80211_MAX_AID
+1);
2233 if (bss
->dtim_count
== 0)
2234 bss
->dtim_count
= beacon
->dtim_period
- 1;
2238 tim
= pos
= (u8
*) skb_put(skb
, 6);
2239 *pos
++ = WLAN_EID_TIM
;
2241 *pos
++ = bss
->dtim_count
;
2242 *pos
++ = beacon
->dtim_period
;
2244 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2247 bss
->dtim_bc_mc
= aid0
== 1;
2250 /* Find largest even number N1 so that bits numbered 1 through
2251 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2252 * (N2 + 1) x 8 through 2007 are 0. */
2254 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2261 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2268 /* Bitmap control */
2270 /* Part Virt Bitmap */
2271 skb_put(skb
, n2
- n1
);
2272 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2274 tim
[1] = n2
- n1
+ 4;
2276 *pos
++ = aid0
; /* Bitmap control */
2277 *pos
++ = 0; /* Part Virt Bitmap */
2281 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2282 struct ieee80211_vif
*vif
,
2283 u16
*tim_offset
, u16
*tim_length
)
2285 struct ieee80211_local
*local
= hw_to_local(hw
);
2286 struct sk_buff
*skb
= NULL
;
2287 struct ieee80211_tx_info
*info
;
2288 struct ieee80211_sub_if_data
*sdata
= NULL
;
2289 struct ieee80211_if_ap
*ap
= NULL
;
2290 struct beacon_data
*beacon
;
2291 struct ieee80211_supported_band
*sband
;
2292 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2293 struct ieee80211_tx_rate_control txrc
;
2295 sband
= local
->hw
.wiphy
->bands
[band
];
2299 sdata
= vif_to_sdata(vif
);
2301 if (!ieee80211_sdata_running(sdata
))
2309 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2311 beacon
= rcu_dereference(ap
->beacon
);
2314 * headroom, head length,
2315 * tail length and maximum TIM length
2317 skb
= dev_alloc_skb(local
->tx_headroom
+
2319 beacon
->tail_len
+ 256);
2323 skb_reserve(skb
, local
->tx_headroom
);
2324 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2328 * Not very nice, but we want to allow the driver to call
2329 * ieee80211_beacon_get() as a response to the set_tim()
2330 * callback. That, however, is already invoked under the
2331 * sta_lock to guarantee consistent and race-free update
2332 * of the tim bitmap in mac80211 and the driver.
2334 if (local
->tim_in_locked_section
) {
2335 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2337 unsigned long flags
;
2339 spin_lock_irqsave(&local
->sta_lock
, flags
);
2340 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2341 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2345 *tim_offset
= beacon
->head_len
;
2347 *tim_length
= skb
->len
- beacon
->head_len
;
2350 memcpy(skb_put(skb
, beacon
->tail_len
),
2351 beacon
->tail
, beacon
->tail_len
);
2354 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2355 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2356 struct ieee80211_hdr
*hdr
;
2357 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2362 skb
= skb_copy(presp
, GFP_ATOMIC
);
2366 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2367 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2368 IEEE80211_STYPE_BEACON
);
2369 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2370 struct ieee80211_mgmt
*mgmt
;
2372 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2373 sizeof(mgmt
->u
.beacon
);
2375 #ifdef CONFIG_MAC80211_MESH
2376 if (!sdata
->u
.mesh
.mesh_id_len
)
2380 skb
= dev_alloc_skb(local
->tx_headroom
+
2383 2 + 8 + /* supported rates */
2384 2 + 3 + /* DS params */
2385 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2386 2 + sizeof(struct ieee80211_ht_cap
) +
2387 2 + sizeof(struct ieee80211_ht_info
) +
2388 2 + sdata
->u
.mesh
.mesh_id_len
+
2389 2 + sizeof(struct ieee80211_meshconf_ie
) +
2390 sdata
->u
.mesh
.ie_len
);
2394 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2395 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2396 memset(mgmt
, 0, hdr_len
);
2397 mgmt
->frame_control
=
2398 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2399 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2400 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2401 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2402 mgmt
->u
.beacon
.beacon_int
=
2403 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2404 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2405 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2407 pos
= skb_put(skb
, 2);
2408 *pos
++ = WLAN_EID_SSID
;
2411 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
) ||
2412 mesh_add_ds_params_ie(skb
, sdata
) ||
2413 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
) ||
2414 mesh_add_rsn_ie(skb
, sdata
) ||
2415 mesh_add_ht_cap_ie(skb
, sdata
) ||
2416 mesh_add_ht_info_ie(skb
, sdata
) ||
2417 mesh_add_meshid_ie(skb
, sdata
) ||
2418 mesh_add_meshconf_ie(skb
, sdata
) ||
2419 mesh_add_vendor_ies(skb
, sdata
)) {
2420 pr_err("o11s: couldn't add ies!\n");
2428 info
= IEEE80211_SKB_CB(skb
);
2430 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2431 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2434 memset(&txrc
, 0, sizeof(txrc
));
2437 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2439 txrc
.reported_rate
.idx
= -1;
2440 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2441 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2442 txrc
.max_rate_idx
= -1;
2444 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2446 rate_control_get_rate(sdata
, NULL
, &txrc
);
2448 info
->control
.vif
= vif
;
2450 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2451 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2452 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2457 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2459 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2460 struct ieee80211_vif
*vif
)
2462 struct ieee80211_if_ap
*ap
= NULL
;
2463 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2464 struct ieee80211_hdr
*hdr
;
2465 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2467 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2473 presp
= rcu_dereference(ap
->probe_resp
);
2477 skb
= skb_copy(presp
, GFP_ATOMIC
);
2481 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2482 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2488 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2490 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2491 struct ieee80211_vif
*vif
)
2493 struct ieee80211_sub_if_data
*sdata
;
2494 struct ieee80211_if_managed
*ifmgd
;
2495 struct ieee80211_pspoll
*pspoll
;
2496 struct ieee80211_local
*local
;
2497 struct sk_buff
*skb
;
2499 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2502 sdata
= vif_to_sdata(vif
);
2503 ifmgd
= &sdata
->u
.mgd
;
2504 local
= sdata
->local
;
2506 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2510 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2512 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2513 memset(pspoll
, 0, sizeof(*pspoll
));
2514 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2515 IEEE80211_STYPE_PSPOLL
);
2516 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2518 /* aid in PS-Poll has its two MSBs each set to 1 */
2519 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2521 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2522 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2526 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2528 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2529 struct ieee80211_vif
*vif
)
2531 struct ieee80211_hdr_3addr
*nullfunc
;
2532 struct ieee80211_sub_if_data
*sdata
;
2533 struct ieee80211_if_managed
*ifmgd
;
2534 struct ieee80211_local
*local
;
2535 struct sk_buff
*skb
;
2537 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2540 sdata
= vif_to_sdata(vif
);
2541 ifmgd
= &sdata
->u
.mgd
;
2542 local
= sdata
->local
;
2544 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2548 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2550 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2552 memset(nullfunc
, 0, sizeof(*nullfunc
));
2553 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2554 IEEE80211_STYPE_NULLFUNC
|
2555 IEEE80211_FCTL_TODS
);
2556 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2557 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2558 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2562 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2564 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2565 struct ieee80211_vif
*vif
,
2566 const u8
*ssid
, size_t ssid_len
,
2567 const u8
*ie
, size_t ie_len
)
2569 struct ieee80211_sub_if_data
*sdata
;
2570 struct ieee80211_local
*local
;
2571 struct ieee80211_hdr_3addr
*hdr
;
2572 struct sk_buff
*skb
;
2576 sdata
= vif_to_sdata(vif
);
2577 local
= sdata
->local
;
2578 ie_ssid_len
= 2 + ssid_len
;
2580 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2581 ie_ssid_len
+ ie_len
);
2585 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2587 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2588 memset(hdr
, 0, sizeof(*hdr
));
2589 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2590 IEEE80211_STYPE_PROBE_REQ
);
2591 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2592 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2593 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2595 pos
= skb_put(skb
, ie_ssid_len
);
2596 *pos
++ = WLAN_EID_SSID
;
2599 memcpy(pos
, ssid
, ssid_len
);
2603 pos
= skb_put(skb
, ie_len
);
2604 memcpy(pos
, ie
, ie_len
);
2609 EXPORT_SYMBOL(ieee80211_probereq_get
);
2611 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2612 const void *frame
, size_t frame_len
,
2613 const struct ieee80211_tx_info
*frame_txctl
,
2614 struct ieee80211_rts
*rts
)
2616 const struct ieee80211_hdr
*hdr
= frame
;
2618 rts
->frame_control
=
2619 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2620 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2622 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2623 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2625 EXPORT_SYMBOL(ieee80211_rts_get
);
2627 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2628 const void *frame
, size_t frame_len
,
2629 const struct ieee80211_tx_info
*frame_txctl
,
2630 struct ieee80211_cts
*cts
)
2632 const struct ieee80211_hdr
*hdr
= frame
;
2634 cts
->frame_control
=
2635 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2636 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2637 frame_len
, frame_txctl
);
2638 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2640 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2643 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2644 struct ieee80211_vif
*vif
)
2646 struct ieee80211_local
*local
= hw_to_local(hw
);
2647 struct sk_buff
*skb
= NULL
;
2648 struct ieee80211_tx_data tx
;
2649 struct ieee80211_sub_if_data
*sdata
;
2650 struct ieee80211_if_ap
*bss
= NULL
;
2651 struct beacon_data
*beacon
;
2652 struct ieee80211_tx_info
*info
;
2654 sdata
= vif_to_sdata(vif
);
2658 beacon
= rcu_dereference(bss
->beacon
);
2660 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2663 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2664 goto out
; /* send buffered bc/mc only after DTIM beacon */
2667 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2670 local
->total_ps_buffered
--;
2672 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2673 struct ieee80211_hdr
*hdr
=
2674 (struct ieee80211_hdr
*) skb
->data
;
2675 /* more buffered multicast/broadcast frames ==> set
2676 * MoreData flag in IEEE 802.11 header to inform PS
2678 hdr
->frame_control
|=
2679 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2682 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2684 dev_kfree_skb_any(skb
);
2687 info
= IEEE80211_SKB_CB(skb
);
2689 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2690 tx
.channel
= local
->hw
.conf
.channel
;
2691 info
->band
= tx
.channel
->band
;
2693 if (invoke_tx_handlers(&tx
))
2700 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2702 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2704 skb_set_mac_header(skb
, 0);
2705 skb_set_network_header(skb
, 0);
2706 skb_set_transport_header(skb
, 0);
2708 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2709 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
2713 * The other path calling ieee80211_xmit is from the tasklet,
2714 * and while we can handle concurrent transmissions locking
2715 * requirements are that we do not come into tx with bhs on.
2718 ieee80211_xmit(sdata
, skb
);