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 <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
38 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
41 int rate
, mrate
, erp
, dur
, i
;
42 struct ieee80211_rate
*txrate
;
43 struct ieee80211_local
*local
= tx
->local
;
44 struct ieee80211_supported_band
*sband
;
45 struct ieee80211_hdr
*hdr
;
46 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
48 /* assume HW handles this */
49 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
53 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
56 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
57 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
59 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
62 * data and mgmt (except PS Poll):
64 * - during contention period:
65 * if addr1 is group address: 0
66 * if more fragments = 0 and addr1 is individual address: time to
67 * transmit one ACK plus SIFS
68 * if more fragments = 1 and addr1 is individual address: time to
69 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 * - control response frame (CTS or ACK) shall be transmitted using the
73 * same rate as the immediately previous frame in the frame exchange
74 * sequence, if this rate belongs to the PHY mandatory rates, or else
75 * at the highest possible rate belonging to the PHY rates in the
78 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
79 if (ieee80211_is_ctl(hdr
->frame_control
)) {
80 /* TODO: These control frames are not currently sent by
81 * mac80211, but should they be implemented, this function
82 * needs to be updated to support duration field calculation.
84 * RTS: time needed to transmit pending data/mgmt frame plus
85 * one CTS frame plus one ACK frame plus 3 x SIFS
86 * CTS: duration of immediately previous RTS minus time
87 * required to transmit CTS and its SIFS
88 * ACK: 0 if immediately previous directed data/mgmt had
89 * more=0, with more=1 duration in ACK frame is duration
90 * from previous frame minus time needed to transmit ACK
92 * PS Poll: BIT(15) | BIT(14) | aid
98 if (0 /* FIX: data/mgmt during CFP */)
99 return cpu_to_le16(32768);
101 if (group_addr
) /* Group address as the destination - no ACK */
104 /* Individual destination address:
105 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
106 * CTS and ACK frames shall be transmitted using the highest rate in
107 * basic rate set that is less than or equal to the rate of the
108 * immediately previous frame and that is using the same modulation
109 * (CCK or OFDM). If no basic rate set matches with these requirements,
110 * the highest mandatory rate of the PHY that is less than or equal to
111 * the rate of the previous frame is used.
112 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 /* use lowest available if everything fails */
116 mrate
= sband
->bitrates
[0].bitrate
;
117 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
118 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
120 if (r
->bitrate
> txrate
->bitrate
)
123 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
126 switch (sband
->band
) {
127 case IEEE80211_BAND_2GHZ
: {
129 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
130 flag
= IEEE80211_RATE_MANDATORY_G
;
132 flag
= IEEE80211_RATE_MANDATORY_B
;
137 case IEEE80211_BAND_5GHZ
:
138 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
141 case IEEE80211_NUM_BANDS
:
147 /* No matching basic rate found; use highest suitable mandatory
152 /* Time needed to transmit ACK
153 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
154 * to closest integer */
156 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
157 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
160 /* Frame is fragmented: duration increases with time needed to
161 * transmit next fragment plus ACK and 2 x SIFS. */
162 dur
*= 2; /* ACK + SIFS */
164 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
165 txrate
->bitrate
, erp
,
166 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
169 return cpu_to_le16(dur
);
172 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
173 struct net_device
*dev
)
175 return local
== wdev_priv(dev
->ieee80211_ptr
);
179 static ieee80211_tx_result debug_noinline
180 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
182 struct ieee80211_local
*local
= tx
->local
;
183 struct ieee80211_if_managed
*ifmgd
;
185 /* driver doesn't support power save */
186 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
189 /* hardware does dynamic power save */
190 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
193 /* dynamic power save disabled */
194 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
197 /* we are scanning, don't enable power save */
201 if (!local
->ps_sdata
)
204 /* No point if we're going to suspend */
205 if (local
->quiescing
)
208 /* dynamic ps is supported only in managed mode */
209 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
212 ifmgd
= &tx
->sdata
->u
.mgd
;
215 * Don't wakeup from power save if u-apsd is enabled, voip ac has
216 * u-apsd enabled and the frame is in voip class. This effectively
217 * means that even if all access categories have u-apsd enabled, in
218 * practise u-apsd is only used with the voip ac. This is a
219 * workaround for the case when received voip class packets do not
220 * have correct qos tag for some reason, due the network or the
223 * Note: local->uapsd_queues access is racy here. If the value is
224 * changed via debugfs, user needs to reassociate manually to have
225 * everything in sync.
227 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
228 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
229 && skb_get_queue_mapping(tx
->skb
) == 0)
232 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
233 ieee80211_stop_queues_by_reason(&local
->hw
,
234 IEEE80211_QUEUE_STOP_REASON_PS
);
235 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
236 ieee80211_queue_work(&local
->hw
,
237 &local
->dynamic_ps_disable_work
);
240 /* Don't restart the timer if we're not disassociated */
241 if (!ifmgd
->associated
)
244 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
245 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
250 static ieee80211_tx_result debug_noinline
251 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
254 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
255 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
258 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
261 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
262 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
263 !ieee80211_is_probe_req(hdr
->frame_control
) &&
264 !ieee80211_is_nullfunc(hdr
->frame_control
))
266 * When software scanning only nullfunc frames (to notify
267 * the sleep state to the AP) and probe requests (for the
268 * active scan) are allowed, all other frames should not be
269 * sent and we should not get here, but if we do
270 * nonetheless, drop them to avoid sending them
271 * off-channel. See the link below and
272 * ieee80211_start_scan() for more.
274 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
278 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
281 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
284 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
287 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
289 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
290 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
291 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
292 ieee80211_is_data(hdr
->frame_control
))) {
293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
294 printk(KERN_DEBUG
"%s: dropped data frame to not "
295 "associated station %pM\n",
296 tx
->sdata
->name
, hdr
->addr1
);
297 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
298 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
302 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
303 tx
->local
->num_sta
== 0 &&
304 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
306 * No associated STAs - no need to send multicast
317 /* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
323 int total
= 0, purged
= 0;
325 struct ieee80211_sub_if_data
*sdata
;
326 struct sta_info
*sta
;
329 * virtual interfaces are protected by RCU
333 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
334 struct ieee80211_if_ap
*ap
;
335 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
338 skb
= skb_dequeue(&ap
->ps_bc_buf
);
343 total
+= skb_queue_len(&ap
->ps_bc_buf
);
346 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
347 skb
= skb_dequeue(&sta
->ps_tx_buf
);
352 total
+= skb_queue_len(&sta
->ps_tx_buf
);
357 local
->total_ps_buffered
= total
;
358 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
359 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
364 static ieee80211_tx_result
365 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
367 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
368 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
371 * broadcast/multicast frame
373 * If any of the associated stations is in power save mode,
374 * the frame is buffered to be sent after DTIM beacon frame.
375 * This is done either by the hardware or us.
378 /* powersaving STAs only in AP/VLAN mode */
382 /* no buffering for ordered frames */
383 if (ieee80211_has_order(hdr
->frame_control
))
386 /* no stations in PS mode */
387 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
390 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
392 /* device releases frame after DTIM beacon */
393 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
396 /* buffered in mac80211 */
397 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
398 purge_old_ps_buffers(tx
->local
);
400 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
401 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
403 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
406 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
408 tx
->local
->total_ps_buffered
++;
410 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
415 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
418 if (!ieee80211_is_mgmt(fc
))
421 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
424 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
431 static ieee80211_tx_result
432 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
434 struct sta_info
*sta
= tx
->sta
;
435 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
436 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
437 struct ieee80211_local
*local
= tx
->local
;
441 ieee80211_is_probe_resp(hdr
->frame_control
) ||
442 ieee80211_is_auth(hdr
->frame_control
) ||
443 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
444 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
447 staflags
= get_sta_flags(sta
);
449 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
450 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
451 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
452 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
454 sta
->sta
.addr
, sta
->sta
.aid
,
455 skb_queue_len(&sta
->ps_tx_buf
));
456 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
457 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
458 purge_old_ps_buffers(tx
->local
);
459 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
460 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
461 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
462 if (net_ratelimit()) {
463 printk(KERN_DEBUG
"%s: STA %pM TX "
464 "buffer full - dropping oldest frame\n",
465 tx
->sdata
->name
, sta
->sta
.addr
);
470 tx
->local
->total_ps_buffered
++;
473 * Queue frame to be sent after STA wakes up/polls,
474 * but don't set the TIM bit if the driver is blocking
475 * wakeup or poll response transmissions anyway.
477 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
478 !(staflags
& WLAN_STA_PS_DRIVER
))
479 sta_info_set_tim_bit(sta
);
481 info
->control
.jiffies
= jiffies
;
482 info
->control
.vif
= &tx
->sdata
->vif
;
483 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
484 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
486 if (!timer_pending(&local
->sta_cleanup
))
487 mod_timer(&local
->sta_cleanup
,
488 round_jiffies(jiffies
+
489 STA_INFO_CLEANUP_INTERVAL
));
493 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
494 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
495 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
496 "set -> send frame\n", tx
->sdata
->name
,
499 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
507 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
510 if (tx
->flags
& IEEE80211_TX_UNICAST
)
511 return ieee80211_tx_h_unicast_ps_buf(tx
);
513 return ieee80211_tx_h_multicast_ps_buf(tx
);
516 static ieee80211_tx_result debug_noinline
517 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
519 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
521 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
522 tx
->sdata
->control_port_no_encrypt
))
523 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
528 static ieee80211_tx_result debug_noinline
529 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
531 struct ieee80211_key
*key
= NULL
;
532 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
533 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
535 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
537 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
539 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
540 is_multicast_ether_addr(hdr
->addr1
) &&
541 ieee80211_is_robust_mgmt_frame(hdr
) &&
542 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
544 else if (is_multicast_ether_addr(hdr
->addr1
) &&
545 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
547 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
548 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
550 else if (tx
->sdata
->drop_unencrypted
&&
551 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
552 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
553 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
554 (ieee80211_is_action(hdr
->frame_control
) &&
555 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
556 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
562 bool skip_hw
= false;
564 tx
->key
->tx_rx_count
++;
565 /* TODO: add threshold stuff again */
567 switch (tx
->key
->conf
.cipher
) {
568 case WLAN_CIPHER_SUITE_WEP40
:
569 case WLAN_CIPHER_SUITE_WEP104
:
570 if (ieee80211_is_auth(hdr
->frame_control
))
572 case WLAN_CIPHER_SUITE_TKIP
:
573 if (!ieee80211_is_data_present(hdr
->frame_control
))
576 case WLAN_CIPHER_SUITE_CCMP
:
577 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
578 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
582 skip_hw
= (tx
->key
->conf
.flags
&
583 IEEE80211_KEY_FLAG_SW_MGMT
) &&
584 ieee80211_is_mgmt(hdr
->frame_control
);
586 case WLAN_CIPHER_SUITE_AES_CMAC
:
587 if (!ieee80211_is_mgmt(hdr
->frame_control
))
592 if (!skip_hw
&& tx
->key
&&
593 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
594 info
->control
.hw_key
= &tx
->key
->conf
;
600 static ieee80211_tx_result debug_noinline
601 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
603 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
604 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
605 struct ieee80211_supported_band
*sband
;
606 struct ieee80211_rate
*rate
;
609 bool inval
= false, rts
= false, short_preamble
= false;
610 struct ieee80211_tx_rate_control txrc
;
613 memset(&txrc
, 0, sizeof(txrc
));
615 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
617 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
618 tx
->local
->hw
.wiphy
->frag_threshold
);
620 /* set up the tx rate control struct we give the RC algo */
621 txrc
.hw
= local_to_hw(tx
->local
);
623 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
625 txrc
.reported_rate
.idx
= -1;
626 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
627 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
628 txrc
.max_rate_idx
= -1;
630 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
631 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
632 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
634 /* set up RTS protection if desired */
635 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
636 txrc
.rts
= rts
= true;
640 * Use short preamble if the BSS can handle it, but not for
641 * management frames unless we know the receiver can handle
642 * that -- the management frame might be to a station that
643 * just wants a probe response.
645 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
646 (ieee80211_is_data(hdr
->frame_control
) ||
647 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
648 txrc
.short_preamble
= short_preamble
= true;
650 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
653 * Lets not bother rate control if we're associated and cannot
654 * talk to the sta. This should not happen.
656 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
657 (sta_flags
& WLAN_STA_ASSOC
) &&
658 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
659 "%s: Dropped data frame as no usable bitrate found while "
660 "scanning and associated. Target station: "
661 "%pM on %d GHz band\n",
662 tx
->sdata
->name
, hdr
->addr1
,
663 tx
->channel
->band
? 5 : 2))
667 * If we're associated with the sta at this point we know we can at
668 * least send the frame at the lowest bit rate.
670 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
672 if (unlikely(info
->control
.rates
[0].idx
< 0))
675 if (txrc
.reported_rate
.idx
< 0) {
676 txrc
.reported_rate
= info
->control
.rates
[0];
677 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
678 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
680 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
682 if (unlikely(!info
->control
.rates
[0].count
))
683 info
->control
.rates
[0].count
= 1;
685 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
686 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
687 info
->control
.rates
[0].count
= 1;
689 if (is_multicast_ether_addr(hdr
->addr1
)) {
691 * XXX: verify the rate is in the basic rateset
697 * set up the RTS/CTS rate as the fastest basic rate
698 * that is not faster than the data rate
700 * XXX: Should this check all retry rates?
702 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
705 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
707 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
708 /* must be a basic rate */
709 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
711 /* must not be faster than the data rate */
712 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
715 if (sband
->bitrates
[baserate
].bitrate
<
716 sband
->bitrates
[i
].bitrate
)
720 info
->control
.rts_cts_rate_idx
= baserate
;
723 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
725 * make sure there's no valid rate following
726 * an invalid one, just in case drivers don't
727 * take the API seriously to stop at -1.
730 info
->control
.rates
[i
].idx
= -1;
733 if (info
->control
.rates
[i
].idx
< 0) {
739 * For now assume MCS is already set up correctly, this
742 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
743 WARN_ON(info
->control
.rates
[i
].idx
> 76);
747 /* set up RTS protection if desired */
749 info
->control
.rates
[i
].flags
|=
750 IEEE80211_TX_RC_USE_RTS_CTS
;
753 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
754 sband
->n_bitrates
)) {
755 info
->control
.rates
[i
].idx
= -1;
759 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
761 /* set up short preamble */
762 if (short_preamble
&&
763 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
764 info
->control
.rates
[i
].flags
|=
765 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
767 /* set up G protection */
768 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
769 rate
->flags
& IEEE80211_RATE_ERP_G
)
770 info
->control
.rates
[i
].flags
|=
771 IEEE80211_TX_RC_USE_CTS_PROTECT
;
777 static ieee80211_tx_result debug_noinline
778 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
780 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
781 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
787 * Packet injection may want to control the sequence
788 * number, if we have no matching interface then we
789 * neither assign one ourselves nor ask the driver to.
791 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
794 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
797 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
801 * Anything but QoS data that has a sequence number field
802 * (is long enough) gets a sequence number from the global
805 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
806 /* driver should assign sequence number */
807 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
808 /* for pure STA mode without beacons, we can do it */
809 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
810 tx
->sdata
->sequence_number
+= 0x10;
815 * This should be true for injected/management frames only, for
816 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
817 * above since they are not QoS-data frames.
822 /* include per-STA, per-TID sequence counter */
824 qc
= ieee80211_get_qos_ctl(hdr
);
825 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
826 seq
= &tx
->sta
->tid_seq
[tid
];
828 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
830 /* Increase the sequence number. */
831 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
836 static int ieee80211_fragment(struct ieee80211_local
*local
,
837 struct sk_buff
*skb
, int hdrlen
,
840 struct sk_buff
*tail
= skb
, *tmp
;
841 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
842 int pos
= hdrlen
+ per_fragm
;
843 int rem
= skb
->len
- hdrlen
- per_fragm
;
845 if (WARN_ON(rem
< 0))
849 int fraglen
= per_fragm
;
854 tmp
= dev_alloc_skb(local
->tx_headroom
+
856 IEEE80211_ENCRYPT_HEADROOM
+
857 IEEE80211_ENCRYPT_TAILROOM
);
862 skb_reserve(tmp
, local
->tx_headroom
+
863 IEEE80211_ENCRYPT_HEADROOM
);
864 /* copy control information */
865 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
866 skb_copy_queue_mapping(tmp
, skb
);
867 tmp
->priority
= skb
->priority
;
870 /* copy header and data */
871 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
872 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
877 skb
->len
= hdrlen
+ per_fragm
;
881 static ieee80211_tx_result debug_noinline
882 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
884 struct sk_buff
*skb
= tx
->skb
;
885 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
886 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
887 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
891 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
895 * Warn when submitting a fragmented A-MPDU frame and drop it.
896 * This scenario is handled in ieee80211_tx_prepare but extra
897 * caution taken here as fragmented ampdu may cause Tx stop.
899 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
902 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
904 /* internal error, why is TX_FRAGMENTED set? */
905 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
909 * Now fragment the frame. This will allocate all the fragments and
910 * chain them (using skb as the first fragment) to skb->next.
911 * During transmission, we will remove the successfully transmitted
912 * fragments from this list. When the low-level driver rejects one
913 * of the fragments then we will simply pretend to accept the skb
914 * but store it away as pending.
916 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
919 /* update duration/seq/flags of fragments */
923 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
925 hdr
= (void *)skb
->data
;
926 info
= IEEE80211_SKB_CB(skb
);
929 hdr
->frame_control
|= morefrags
;
930 next_len
= skb
->next
->len
;
932 * No multi-rate retries for fragmented frames, that
933 * would completely throw off the NAV at other STAs.
935 info
->control
.rates
[1].idx
= -1;
936 info
->control
.rates
[2].idx
= -1;
937 info
->control
.rates
[3].idx
= -1;
938 info
->control
.rates
[4].idx
= -1;
939 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
940 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
942 hdr
->frame_control
&= ~morefrags
;
945 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
946 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
948 } while ((skb
= skb
->next
));
953 static ieee80211_tx_result debug_noinline
954 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
956 struct sk_buff
*skb
= tx
->skb
;
961 tx
->sta
->tx_packets
++;
963 tx
->sta
->tx_fragments
++;
964 tx
->sta
->tx_bytes
+= skb
->len
;
965 } while ((skb
= skb
->next
));
970 static ieee80211_tx_result debug_noinline
971 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
973 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
978 switch (tx
->key
->conf
.cipher
) {
979 case WLAN_CIPHER_SUITE_WEP40
:
980 case WLAN_CIPHER_SUITE_WEP104
:
981 return ieee80211_crypto_wep_encrypt(tx
);
982 case WLAN_CIPHER_SUITE_TKIP
:
983 return ieee80211_crypto_tkip_encrypt(tx
);
984 case WLAN_CIPHER_SUITE_CCMP
:
985 return ieee80211_crypto_ccmp_encrypt(tx
);
986 case WLAN_CIPHER_SUITE_AES_CMAC
:
987 return ieee80211_crypto_aes_cmac_encrypt(tx
);
989 /* handle hw-only algorithm */
990 if (info
->control
.hw_key
) {
991 ieee80211_tx_set_protected(tx
);
1001 static ieee80211_tx_result debug_noinline
1002 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1004 struct sk_buff
*skb
= tx
->skb
;
1005 struct ieee80211_hdr
*hdr
;
1010 hdr
= (void *) skb
->data
;
1011 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1012 break; /* must not overwrite AID */
1013 next_len
= skb
->next
? skb
->next
->len
: 0;
1014 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1017 ieee80211_duration(tx
, group_addr
, next_len
);
1018 } while ((skb
= skb
->next
));
1023 /* actual transmit path */
1026 * deal with packet injection down monitor interface
1027 * with Radiotap Header -- only called for monitor mode interface
1029 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1030 struct sk_buff
*skb
)
1033 * this is the moment to interpret and discard the radiotap header that
1034 * must be at the start of the packet injected in Monitor mode
1036 * Need to take some care with endian-ness since radiotap
1037 * args are little-endian
1040 struct ieee80211_radiotap_iterator iterator
;
1041 struct ieee80211_radiotap_header
*rthdr
=
1042 (struct ieee80211_radiotap_header
*) skb
->data
;
1044 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1045 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1048 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1049 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1051 /* packet is fragmented in HW if we have a non-NULL driver callback */
1052 hw_frag
= (tx
->local
->ops
->set_frag_threshold
!= NULL
);
1055 * for every radiotap entry that is present
1056 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1057 * entries present, or -EINVAL on error)
1061 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1066 /* see if this argument is something we can use */
1067 switch (iterator
.this_arg_index
) {
1069 * You must take care when dereferencing iterator.this_arg
1070 * for multibyte types... the pointer is not aligned. Use
1071 * get_unaligned((type *)iterator.this_arg) to dereference
1072 * iterator.this_arg for type "type" safely on all arches.
1074 case IEEE80211_RADIOTAP_FLAGS
:
1075 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1077 * this indicates that the skb we have been
1078 * handed has the 32-bit FCS CRC at the end...
1079 * we should react to that by snipping it off
1080 * because it will be recomputed and added
1083 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1086 skb_trim(skb
, skb
->len
- FCS_LEN
);
1088 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1089 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1090 if ((*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
) &&
1092 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1096 * Please update the file
1097 * Documentation/networking/mac80211-injection.txt
1098 * when parsing new fields here.
1106 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1110 * remove the radiotap header
1111 * iterator->_max_length was sanity-checked against
1112 * skb->len by iterator init
1114 skb_pull(skb
, iterator
._max_length
);
1119 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1120 struct sk_buff
*skb
,
1121 struct ieee80211_tx_info
*info
,
1122 struct tid_ampdu_tx
*tid_tx
,
1125 bool queued
= false;
1127 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1128 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1129 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1131 * nothing -- this aggregation session is being started
1132 * but that might still fail with the driver
1135 spin_lock(&tx
->sta
->lock
);
1137 * Need to re-check now, because we may get here
1139 * 1) in the window during which the setup is actually
1140 * already done, but not marked yet because not all
1141 * packets are spliced over to the driver pending
1142 * queue yet -- if this happened we acquire the lock
1143 * either before or after the splice happens, but
1144 * need to recheck which of these cases happened.
1146 * 2) during session teardown, if the OPERATIONAL bit
1147 * was cleared due to the teardown but the pointer
1148 * hasn't been assigned NULL yet (or we loaded it
1149 * before it was assigned) -- in this case it may
1150 * now be NULL which means we should just let the
1151 * packet pass through because splicing the frames
1152 * back is already done.
1154 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1157 /* do nothing, let packet pass through */
1158 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1159 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1162 info
->control
.vif
= &tx
->sdata
->vif
;
1163 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1164 __skb_queue_tail(&tid_tx
->pending
, skb
);
1166 spin_unlock(&tx
->sta
->lock
);
1175 static ieee80211_tx_result
1176 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1177 struct ieee80211_tx_data
*tx
,
1178 struct sk_buff
*skb
)
1180 struct ieee80211_local
*local
= sdata
->local
;
1181 struct ieee80211_hdr
*hdr
;
1182 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1186 memset(tx
, 0, sizeof(*tx
));
1190 tx
->channel
= local
->hw
.conf
.channel
;
1192 * Set this flag (used below to indicate "automatic fragmentation"),
1193 * it will be cleared/left by radiotap as desired.
1194 * Only valid when fragmentation is done by the stack.
1196 if (!local
->ops
->set_frag_threshold
)
1197 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1199 /* process and remove the injection radiotap header */
1200 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1201 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1205 * __ieee80211_parse_tx_radiotap has now removed
1206 * the radiotap header that was present and pre-filled
1207 * 'tx' with tx control information.
1209 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1213 * If this flag is set to true anywhere, and we get here,
1214 * we are doing the needed processing, so remove the flag
1217 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1219 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1221 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1222 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1223 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1225 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1226 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1229 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1231 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1232 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1233 struct tid_ampdu_tx
*tid_tx
;
1235 qc
= ieee80211_get_qos_ctl(hdr
);
1236 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1238 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1242 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1245 if (unlikely(queued
))
1250 if (is_multicast_ether_addr(hdr
->addr1
)) {
1251 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1252 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1254 tx
->flags
|= IEEE80211_TX_UNICAST
;
1255 if (unlikely(local
->wifi_wme_noack_test
))
1256 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1258 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1261 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1262 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1263 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1264 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1265 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1267 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1271 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1272 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1273 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1275 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1276 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1277 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1278 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1280 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1286 * Returns false if the frame couldn't be transmitted but was queued instead.
1288 static bool __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
**skbp
,
1289 struct sta_info
*sta
, bool txpending
)
1291 struct sk_buff
*skb
= *skbp
, *next
;
1292 struct ieee80211_tx_info
*info
;
1293 struct ieee80211_sub_if_data
*sdata
;
1294 unsigned long flags
;
1299 int q
= skb_get_queue_mapping(skb
);
1302 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1303 if (local
->queue_stop_reasons
[q
] ||
1304 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1306 * Since queue is stopped, queue up frames for later
1307 * transmission from the tx-pending tasklet when the
1308 * queue is woken again.
1315 * NB: If txpending is true, next must already
1316 * be NULL since we must've gone through this
1317 * loop before already; therefore we can just
1318 * queue the frame to the head without worrying
1319 * about reordering of fragments.
1321 if (unlikely(txpending
))
1322 __skb_queue_head(&local
->pending
[q
],
1325 __skb_queue_tail(&local
->pending
[q
],
1327 } while ((skb
= next
));
1329 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1333 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1335 info
= IEEE80211_SKB_CB(skb
);
1338 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1339 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1345 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1347 sdata
= vif_to_sdata(info
->control
.vif
);
1349 switch (sdata
->vif
.type
) {
1350 case NL80211_IFTYPE_MONITOR
:
1351 info
->control
.vif
= NULL
;
1353 case NL80211_IFTYPE_AP_VLAN
:
1354 info
->control
.vif
= &container_of(sdata
->bss
,
1355 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1362 if (sta
&& sta
->uploaded
)
1363 info
->control
.sta
= &sta
->sta
;
1365 info
->control
.sta
= NULL
;
1367 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1370 ieee80211_tpt_led_trig_tx(local
, fc
, len
);
1372 ieee80211_led_tx(local
, 1);
1380 * Invoke TX handlers, return 0 on success and non-zero if the
1381 * frame was dropped or queued.
1383 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1385 struct sk_buff
*skb
= tx
->skb
;
1386 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1387 ieee80211_tx_result res
= TX_DROP
;
1389 #define CALL_TXH(txh) \
1392 if (res != TX_CONTINUE) \
1396 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1397 CALL_TXH(ieee80211_tx_h_check_assoc
);
1398 CALL_TXH(ieee80211_tx_h_ps_buf
);
1399 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1400 CALL_TXH(ieee80211_tx_h_select_key
);
1401 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1402 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1404 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1407 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1408 CALL_TXH(ieee80211_tx_h_sequence
);
1409 CALL_TXH(ieee80211_tx_h_fragment
);
1410 /* handlers after fragment must be aware of tx info fragmentation! */
1411 CALL_TXH(ieee80211_tx_h_stats
);
1412 CALL_TXH(ieee80211_tx_h_encrypt
);
1413 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1414 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1418 if (unlikely(res
== TX_DROP
)) {
1419 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1421 struct sk_buff
*next
;
1428 } else if (unlikely(res
== TX_QUEUED
)) {
1429 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1437 * Returns false if the frame couldn't be transmitted but was queued instead.
1439 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1440 struct sk_buff
*skb
, bool txpending
)
1442 struct ieee80211_local
*local
= sdata
->local
;
1443 struct ieee80211_tx_data tx
;
1444 ieee80211_tx_result res_prepare
;
1445 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1448 if (unlikely(skb
->len
< 10)) {
1455 /* initialises tx */
1456 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1458 if (unlikely(res_prepare
== TX_DROP
)) {
1461 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1465 tx
.channel
= local
->hw
.conf
.channel
;
1466 info
->band
= tx
.channel
->band
;
1468 if (!invoke_tx_handlers(&tx
))
1469 result
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1475 /* device xmit handlers */
1477 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1478 struct sk_buff
*skb
,
1479 int head_need
, bool may_encrypt
)
1484 * This could be optimised, devices that do full hardware
1485 * crypto (including TKIP MMIC) need no tailroom... But we
1486 * have no drivers for such devices currently.
1489 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1490 tail_need
-= skb_tailroom(skb
);
1491 tail_need
= max_t(int, tail_need
, 0);
1494 if (head_need
|| tail_need
) {
1495 /* Sorry. Can't account for this any more */
1499 if (skb_cloned(skb
))
1500 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1501 else if (head_need
|| tail_need
)
1502 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1506 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1507 wiphy_debug(local
->hw
.wiphy
,
1508 "failed to reallocate TX buffer\n");
1512 /* update truesize too */
1513 skb
->truesize
+= head_need
+ tail_need
;
1518 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1519 struct sk_buff
*skb
)
1521 struct ieee80211_local
*local
= sdata
->local
;
1522 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1523 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1524 struct ieee80211_sub_if_data
*tmp_sdata
;
1530 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1534 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1535 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1537 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1538 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1539 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1541 /* check the header is complete in the frame */
1542 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1544 * We process outgoing injected frames that have a
1545 * local address we handle as though they are our
1547 * This code here isn't entirely correct, the local
1548 * MAC address is not necessarily enough to find
1549 * the interface to use; for that proper VLAN/WDS
1550 * support we will need a different mechanism.
1553 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1555 if (!ieee80211_sdata_running(tmp_sdata
))
1557 if (tmp_sdata
->vif
.type
==
1558 NL80211_IFTYPE_MONITOR
||
1559 tmp_sdata
->vif
.type
==
1560 NL80211_IFTYPE_AP_VLAN
||
1561 tmp_sdata
->vif
.type
==
1564 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1573 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1575 headroom
= local
->tx_headroom
;
1577 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1578 headroom
-= skb_headroom(skb
);
1579 headroom
= max_t(int, 0, headroom
);
1581 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1587 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1588 info
->control
.vif
= &sdata
->vif
;
1590 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1591 ieee80211_is_data(hdr
->frame_control
) &&
1592 !is_multicast_ether_addr(hdr
->addr1
))
1593 if (mesh_nexthop_lookup(skb
, sdata
)) {
1594 /* skb queued: don't free */
1599 ieee80211_set_qos_hdr(local
, skb
);
1600 ieee80211_tx(sdata
, skb
, false);
1604 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1605 struct net_device
*dev
)
1607 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1608 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1609 struct ieee80211_radiotap_header
*prthdr
=
1610 (struct ieee80211_radiotap_header
*)skb
->data
;
1611 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1615 * Frame injection is not allowed if beaconing is not allowed
1616 * or if we need radar detection. Beaconing is usually not allowed when
1617 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1618 * Passive scan is also used in world regulatory domains where
1619 * your country is not known and as such it should be treated as
1620 * NO TX unless the channel is explicitly allowed in which case
1621 * your current regulatory domain would not have the passive scan
1624 * Since AP mode uses monitor interfaces to inject/TX management
1625 * frames we can make AP mode the exception to this rule once it
1626 * supports radar detection as its implementation can deal with
1627 * radar detection by itself. We can do that later by adding a
1628 * monitor flag interfaces used for AP support.
1630 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1631 IEEE80211_CHAN_PASSIVE_SCAN
)))
1634 /* check for not even having the fixed radiotap header part */
1635 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1636 goto fail
; /* too short to be possibly valid */
1638 /* is it a header version we can trust to find length from? */
1639 if (unlikely(prthdr
->it_version
))
1640 goto fail
; /* only version 0 is supported */
1642 /* then there must be a radiotap header with a length we can use */
1643 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1645 /* does the skb contain enough to deliver on the alleged length? */
1646 if (unlikely(skb
->len
< len_rthdr
))
1647 goto fail
; /* skb too short for claimed rt header extent */
1650 * fix up the pointers accounting for the radiotap
1651 * header still being in there. We are being given
1652 * a precooked IEEE80211 header so no need for
1655 skb_set_mac_header(skb
, len_rthdr
);
1657 * these are just fixed to the end of the rt area since we
1658 * don't have any better information and at this point, nobody cares
1660 skb_set_network_header(skb
, len_rthdr
);
1661 skb_set_transport_header(skb
, len_rthdr
);
1663 memset(info
, 0, sizeof(*info
));
1665 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1667 /* pass the radiotap header up to xmit */
1668 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1669 return NETDEV_TX_OK
;
1673 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1677 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1678 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1679 * @skb: packet to be sent
1680 * @dev: incoming interface
1682 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1683 * not be freed, and caller is responsible for either retrying later or freeing
1686 * This function takes in an Ethernet header and encapsulates it with suitable
1687 * IEEE 802.11 header based on which interface the packet is coming in. The
1688 * encapsulated packet will then be passed to master interface, wlan#.11, for
1689 * transmission (through low-level driver).
1691 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1692 struct net_device
*dev
)
1694 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1695 struct ieee80211_local
*local
= sdata
->local
;
1696 struct ieee80211_tx_info
*info
;
1697 int ret
= NETDEV_TX_BUSY
, head_need
;
1698 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1700 struct ieee80211_hdr hdr
;
1701 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1702 struct mesh_path __maybe_unused
*mppath
= NULL
;
1703 const u8
*encaps_data
;
1704 int encaps_len
, skip_header_bytes
;
1706 struct sta_info
*sta
= NULL
;
1708 struct sk_buff
*tmp_skb
;
1710 if (unlikely(skb
->len
< ETH_HLEN
)) {
1715 /* convert Ethernet header to proper 802.11 header (based on
1716 * operation mode) */
1717 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1718 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1720 switch (sdata
->vif
.type
) {
1721 case NL80211_IFTYPE_AP_VLAN
:
1723 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1725 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1727 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1728 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1729 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1730 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1732 sta_flags
= get_sta_flags(sta
);
1738 case NL80211_IFTYPE_AP
:
1739 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1741 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1742 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1743 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1746 case NL80211_IFTYPE_WDS
:
1747 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1749 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1750 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1751 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1752 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1755 #ifdef CONFIG_MAC80211_MESH
1756 case NL80211_IFTYPE_MESH_POINT
:
1757 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1758 /* Do not send frames with mesh_ttl == 0 */
1759 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1764 if (!is_multicast_ether_addr(skb
->data
))
1765 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1768 * Use address extension if it is a packet from
1769 * another interface or if we know the destination
1770 * is being proxied by a portal (i.e. portal address
1771 * differs from proxied address)
1773 if (compare_ether_addr(sdata
->vif
.addr
,
1774 skb
->data
+ ETH_ALEN
) == 0 &&
1775 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1776 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1777 skb
->data
, skb
->data
+ ETH_ALEN
);
1779 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1782 int is_mesh_mcast
= 1;
1785 if (is_multicast_ether_addr(skb
->data
))
1786 /* DA TA mSA AE:SA */
1787 mesh_da
= skb
->data
;
1789 static const u8 bcast
[ETH_ALEN
] =
1790 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1792 /* RA TA mDA mSA AE:DA SA */
1793 mesh_da
= mppath
->mpp
;
1796 /* DA TA mSA AE:SA */
1800 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1801 mesh_da
, sdata
->vif
.addr
);
1805 ieee80211_new_mesh_header(&mesh_hdr
,
1807 skb
->data
+ ETH_ALEN
,
1811 ieee80211_new_mesh_header(&mesh_hdr
,
1814 skb
->data
+ ETH_ALEN
);
1819 case NL80211_IFTYPE_STATION
:
1820 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1821 if (sdata
->u
.mgd
.use_4addr
&&
1822 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1823 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1825 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1826 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1827 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1830 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1832 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1833 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1837 case NL80211_IFTYPE_ADHOC
:
1839 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1840 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1841 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1850 * There's no need to try to look up the destination
1851 * if it is a multicast address (which can only happen
1854 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1856 sta
= sta_info_get(sdata
, hdr
.addr1
);
1858 sta_flags
= get_sta_flags(sta
);
1862 /* receiver and we are QoS enabled, use a QoS type frame */
1863 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1864 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1869 * Drop unicast frames to unauthorised stations unless they are
1870 * EAPOL frames from the local station.
1872 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1873 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1874 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1875 !(cpu_to_be16(ethertype
) == sdata
->control_port_protocol
&&
1876 compare_ether_addr(sdata
->vif
.addr
,
1877 skb
->data
+ ETH_ALEN
) == 0))) {
1878 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1879 if (net_ratelimit())
1880 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1881 " (unauthorized port)\n", dev
->name
,
1885 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1892 * If the skb is shared we need to obtain our own copy.
1894 if (skb_shared(skb
)) {
1896 skb
= skb_clone(skb
, GFP_ATOMIC
);
1905 hdr
.frame_control
= fc
;
1906 hdr
.duration_id
= 0;
1909 skip_header_bytes
= ETH_HLEN
;
1910 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1911 encaps_data
= bridge_tunnel_header
;
1912 encaps_len
= sizeof(bridge_tunnel_header
);
1913 skip_header_bytes
-= 2;
1914 } else if (ethertype
>= 0x600) {
1915 encaps_data
= rfc1042_header
;
1916 encaps_len
= sizeof(rfc1042_header
);
1917 skip_header_bytes
-= 2;
1923 nh_pos
= skb_network_header(skb
) - skb
->data
;
1924 h_pos
= skb_transport_header(skb
) - skb
->data
;
1926 skb_pull(skb
, skip_header_bytes
);
1927 nh_pos
-= skip_header_bytes
;
1928 h_pos
-= skip_header_bytes
;
1930 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1933 * So we need to modify the skb header and hence need a copy of
1934 * that. The head_need variable above doesn't, so far, include
1935 * the needed header space that we don't need right away. If we
1936 * can, then we don't reallocate right now but only after the
1937 * frame arrives at the master device (if it does...)
1939 * If we cannot, however, then we will reallocate to include all
1940 * the ever needed space. Also, if we need to reallocate it anyway,
1941 * make it big enough for everything we may ever need.
1944 if (head_need
> 0 || skb_cloned(skb
)) {
1945 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1946 head_need
+= local
->tx_headroom
;
1947 head_need
= max_t(int, 0, head_need
);
1948 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1953 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1954 nh_pos
+= encaps_len
;
1955 h_pos
+= encaps_len
;
1958 #ifdef CONFIG_MAC80211_MESH
1959 if (meshhdrlen
> 0) {
1960 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1961 nh_pos
+= meshhdrlen
;
1962 h_pos
+= meshhdrlen
;
1966 if (ieee80211_is_data_qos(fc
)) {
1967 __le16
*qos_control
;
1969 qos_control
= (__le16
*) skb_push(skb
, 2);
1970 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1972 * Maybe we could actually set some fields here, for now just
1973 * initialise to zero to indicate no special operation.
1977 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1982 dev
->stats
.tx_packets
++;
1983 dev
->stats
.tx_bytes
+= skb
->len
;
1985 /* Update skb pointers to various headers since this modified frame
1986 * is going to go through Linux networking code that may potentially
1987 * need things like pointer to IP header. */
1988 skb_set_mac_header(skb
, 0);
1989 skb_set_network_header(skb
, nh_pos
);
1990 skb_set_transport_header(skb
, h_pos
);
1992 info
= IEEE80211_SKB_CB(skb
);
1993 memset(info
, 0, sizeof(*info
));
1995 dev
->trans_start
= jiffies
;
1996 ieee80211_xmit(sdata
, skb
);
1998 return NETDEV_TX_OK
;
2001 if (ret
== NETDEV_TX_OK
)
2009 * ieee80211_clear_tx_pending may not be called in a context where
2010 * it is possible that it packets could come in again.
2012 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2016 for (i
= 0; i
< local
->hw
.queues
; i
++)
2017 skb_queue_purge(&local
->pending
[i
]);
2021 * Returns false if the frame couldn't be transmitted but was queued instead,
2022 * which in this case means re-queued -- take as an indication to stop sending
2023 * more pending frames.
2025 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2026 struct sk_buff
*skb
)
2028 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2029 struct ieee80211_sub_if_data
*sdata
;
2030 struct sta_info
*sta
;
2031 struct ieee80211_hdr
*hdr
;
2034 sdata
= vif_to_sdata(info
->control
.vif
);
2036 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2037 result
= ieee80211_tx(sdata
, skb
, true);
2039 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2040 sta
= sta_info_get(sdata
, hdr
->addr1
);
2042 result
= __ieee80211_tx(local
, &skb
, sta
, true);
2049 * Transmit all pending packets. Called from tasklet.
2051 void ieee80211_tx_pending(unsigned long data
)
2053 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2054 struct ieee80211_sub_if_data
*sdata
;
2055 unsigned long flags
;
2061 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2062 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2064 * If queue is stopped by something other than due to pending
2065 * frames, or we have no pending frames, proceed to next queue.
2067 if (local
->queue_stop_reasons
[i
] ||
2068 skb_queue_empty(&local
->pending
[i
]))
2071 while (!skb_queue_empty(&local
->pending
[i
])) {
2072 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2073 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2075 if (WARN_ON(!info
->control
.vif
)) {
2080 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2083 txok
= ieee80211_tx_pending_skb(local
, skb
);
2084 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2090 if (skb_queue_empty(&local
->pending
[i
]))
2091 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2092 netif_wake_subqueue(sdata
->dev
, i
);
2094 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2099 /* functions for drivers to get certain frames */
2101 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2102 struct sk_buff
*skb
,
2103 struct beacon_data
*beacon
)
2107 int i
, have_bits
= 0, n1
, n2
;
2109 /* Generate bitmap for TIM only if there are any STAs in power save
2111 if (atomic_read(&bss
->num_sta_ps
) > 0)
2112 /* in the hope that this is faster than
2113 * checking byte-for-byte */
2114 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2115 IEEE80211_MAX_AID
+1);
2117 if (bss
->dtim_count
== 0)
2118 bss
->dtim_count
= beacon
->dtim_period
- 1;
2122 tim
= pos
= (u8
*) skb_put(skb
, 6);
2123 *pos
++ = WLAN_EID_TIM
;
2125 *pos
++ = bss
->dtim_count
;
2126 *pos
++ = beacon
->dtim_period
;
2128 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2131 bss
->dtim_bc_mc
= aid0
== 1;
2134 /* Find largest even number N1 so that bits numbered 1 through
2135 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2136 * (N2 + 1) x 8 through 2007 are 0. */
2138 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2145 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2152 /* Bitmap control */
2154 /* Part Virt Bitmap */
2155 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2157 tim
[1] = n2
- n1
+ 4;
2158 skb_put(skb
, n2
- n1
);
2160 *pos
++ = aid0
; /* Bitmap control */
2161 *pos
++ = 0; /* Part Virt Bitmap */
2165 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2166 struct ieee80211_vif
*vif
,
2167 u16
*tim_offset
, u16
*tim_length
)
2169 struct ieee80211_local
*local
= hw_to_local(hw
);
2170 struct sk_buff
*skb
= NULL
;
2171 struct ieee80211_tx_info
*info
;
2172 struct ieee80211_sub_if_data
*sdata
= NULL
;
2173 struct ieee80211_if_ap
*ap
= NULL
;
2174 struct beacon_data
*beacon
;
2175 struct ieee80211_supported_band
*sband
;
2176 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2177 struct ieee80211_tx_rate_control txrc
;
2179 sband
= local
->hw
.wiphy
->bands
[band
];
2183 sdata
= vif_to_sdata(vif
);
2185 if (!ieee80211_sdata_running(sdata
))
2193 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2195 beacon
= rcu_dereference(ap
->beacon
);
2198 * headroom, head length,
2199 * tail length and maximum TIM length
2201 skb
= dev_alloc_skb(local
->tx_headroom
+
2203 beacon
->tail_len
+ 256);
2207 skb_reserve(skb
, local
->tx_headroom
);
2208 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2212 * Not very nice, but we want to allow the driver to call
2213 * ieee80211_beacon_get() as a response to the set_tim()
2214 * callback. That, however, is already invoked under the
2215 * sta_lock to guarantee consistent and race-free update
2216 * of the tim bitmap in mac80211 and the driver.
2218 if (local
->tim_in_locked_section
) {
2219 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2221 unsigned long flags
;
2223 spin_lock_irqsave(&local
->sta_lock
, flags
);
2224 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2225 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2229 *tim_offset
= beacon
->head_len
;
2231 *tim_length
= skb
->len
- beacon
->head_len
;
2234 memcpy(skb_put(skb
, beacon
->tail_len
),
2235 beacon
->tail
, beacon
->tail_len
);
2238 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2239 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2240 struct ieee80211_hdr
*hdr
;
2241 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2246 skb
= skb_copy(presp
, GFP_ATOMIC
);
2250 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2251 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2252 IEEE80211_STYPE_BEACON
);
2253 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2254 struct ieee80211_mgmt
*mgmt
;
2257 #ifdef CONFIG_MAC80211_MESH
2258 if (!sdata
->u
.mesh
.mesh_id_len
)
2262 /* headroom, head length, tail length and maximum TIM length */
2263 skb
= dev_alloc_skb(local
->tx_headroom
+ 400 +
2264 sdata
->u
.mesh
.ie_len
);
2268 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2269 mgmt
= (struct ieee80211_mgmt
*)
2270 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2271 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2272 mgmt
->frame_control
=
2273 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2274 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2275 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2276 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2277 mgmt
->u
.beacon
.beacon_int
=
2278 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2279 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2281 pos
= skb_put(skb
, 2);
2282 *pos
++ = WLAN_EID_SSID
;
2285 mesh_mgmt_ies_add(skb
, sdata
);
2291 info
= IEEE80211_SKB_CB(skb
);
2293 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2294 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2297 memset(&txrc
, 0, sizeof(txrc
));
2300 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2302 txrc
.reported_rate
.idx
= -1;
2303 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2304 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2305 txrc
.max_rate_idx
= -1;
2307 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2309 rate_control_get_rate(sdata
, NULL
, &txrc
);
2311 info
->control
.vif
= vif
;
2313 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2314 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2315 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2320 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2322 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2323 struct ieee80211_vif
*vif
)
2325 struct ieee80211_sub_if_data
*sdata
;
2326 struct ieee80211_if_managed
*ifmgd
;
2327 struct ieee80211_pspoll
*pspoll
;
2328 struct ieee80211_local
*local
;
2329 struct sk_buff
*skb
;
2331 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2334 sdata
= vif_to_sdata(vif
);
2335 ifmgd
= &sdata
->u
.mgd
;
2336 local
= sdata
->local
;
2338 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2340 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2341 "pspoll template\n", sdata
->name
);
2344 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2346 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2347 memset(pspoll
, 0, sizeof(*pspoll
));
2348 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2349 IEEE80211_STYPE_PSPOLL
);
2350 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2352 /* aid in PS-Poll has its two MSBs each set to 1 */
2353 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2355 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2356 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2360 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2362 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2363 struct ieee80211_vif
*vif
)
2365 struct ieee80211_hdr_3addr
*nullfunc
;
2366 struct ieee80211_sub_if_data
*sdata
;
2367 struct ieee80211_if_managed
*ifmgd
;
2368 struct ieee80211_local
*local
;
2369 struct sk_buff
*skb
;
2371 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2374 sdata
= vif_to_sdata(vif
);
2375 ifmgd
= &sdata
->u
.mgd
;
2376 local
= sdata
->local
;
2378 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2380 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2381 "template\n", sdata
->name
);
2384 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2386 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2388 memset(nullfunc
, 0, sizeof(*nullfunc
));
2389 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2390 IEEE80211_STYPE_NULLFUNC
|
2391 IEEE80211_FCTL_TODS
);
2392 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2393 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2394 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2398 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2400 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2401 struct ieee80211_vif
*vif
,
2402 const u8
*ssid
, size_t ssid_len
,
2403 const u8
*ie
, size_t ie_len
)
2405 struct ieee80211_sub_if_data
*sdata
;
2406 struct ieee80211_local
*local
;
2407 struct ieee80211_hdr_3addr
*hdr
;
2408 struct sk_buff
*skb
;
2412 sdata
= vif_to_sdata(vif
);
2413 local
= sdata
->local
;
2414 ie_ssid_len
= 2 + ssid_len
;
2416 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2417 ie_ssid_len
+ ie_len
);
2419 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2420 "request template\n", sdata
->name
);
2424 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2426 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2427 memset(hdr
, 0, sizeof(*hdr
));
2428 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2429 IEEE80211_STYPE_PROBE_REQ
);
2430 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2431 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2432 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2434 pos
= skb_put(skb
, ie_ssid_len
);
2435 *pos
++ = WLAN_EID_SSID
;
2438 memcpy(pos
, ssid
, ssid_len
);
2442 pos
= skb_put(skb
, ie_len
);
2443 memcpy(pos
, ie
, ie_len
);
2448 EXPORT_SYMBOL(ieee80211_probereq_get
);
2450 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2451 const void *frame
, size_t frame_len
,
2452 const struct ieee80211_tx_info
*frame_txctl
,
2453 struct ieee80211_rts
*rts
)
2455 const struct ieee80211_hdr
*hdr
= frame
;
2457 rts
->frame_control
=
2458 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2459 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2461 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2462 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2464 EXPORT_SYMBOL(ieee80211_rts_get
);
2466 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2467 const void *frame
, size_t frame_len
,
2468 const struct ieee80211_tx_info
*frame_txctl
,
2469 struct ieee80211_cts
*cts
)
2471 const struct ieee80211_hdr
*hdr
= frame
;
2473 cts
->frame_control
=
2474 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2475 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2476 frame_len
, frame_txctl
);
2477 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2479 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2482 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2483 struct ieee80211_vif
*vif
)
2485 struct ieee80211_local
*local
= hw_to_local(hw
);
2486 struct sk_buff
*skb
= NULL
;
2487 struct ieee80211_tx_data tx
;
2488 struct ieee80211_sub_if_data
*sdata
;
2489 struct ieee80211_if_ap
*bss
= NULL
;
2490 struct beacon_data
*beacon
;
2491 struct ieee80211_tx_info
*info
;
2493 sdata
= vif_to_sdata(vif
);
2497 beacon
= rcu_dereference(bss
->beacon
);
2499 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2502 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2503 goto out
; /* send buffered bc/mc only after DTIM beacon */
2506 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2509 local
->total_ps_buffered
--;
2511 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2512 struct ieee80211_hdr
*hdr
=
2513 (struct ieee80211_hdr
*) skb
->data
;
2514 /* more buffered multicast/broadcast frames ==> set
2515 * MoreData flag in IEEE 802.11 header to inform PS
2517 hdr
->frame_control
|=
2518 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2521 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2523 dev_kfree_skb_any(skb
);
2526 info
= IEEE80211_SKB_CB(skb
);
2528 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2529 tx
.channel
= local
->hw
.conf
.channel
;
2530 info
->band
= tx
.channel
->band
;
2532 if (invoke_tx_handlers(&tx
))
2539 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2541 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2543 skb_set_mac_header(skb
, 0);
2544 skb_set_network_header(skb
, 0);
2545 skb_set_transport_header(skb
, 0);
2547 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2548 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
2552 * The other path calling ieee80211_xmit is from the tasklet,
2553 * and while we can handle concurrent transmissions locking
2554 * requirements are that we do not come into tx with bhs on.
2557 ieee80211_xmit(sdata
, skb
);