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"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
45 int rate
, mrate
, erp
, dur
, i
;
46 struct ieee80211_rate
*txrate
;
47 struct ieee80211_local
*local
= tx
->local
;
48 struct ieee80211_supported_band
*sband
;
49 struct ieee80211_hdr
*hdr
;
50 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
52 /* assume HW handles this */
53 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
57 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
60 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
61 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
63 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
83 if (ieee80211_is_ctl(hdr
->frame_control
)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr
) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate
= sband
->bitrates
[0].bitrate
;
121 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
122 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
124 if (r
->bitrate
> txrate
->bitrate
)
127 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
130 switch (sband
->band
) {
131 case IEEE80211_BAND_2GHZ
: {
133 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
134 flag
= IEEE80211_RATE_MANDATORY_G
;
136 flag
= IEEE80211_RATE_MANDATORY_B
;
141 case IEEE80211_BAND_5GHZ
:
142 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
161 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur
*= 2; /* ACK + SIFS */
168 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
169 txrate
->bitrate
, erp
,
170 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
173 return cpu_to_le16(dur
);
176 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
177 struct net_device
*dev
)
179 return local
== wdev_priv(dev
->ieee80211_ptr
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
186 struct ieee80211_local
*local
= tx
->local
;
187 struct ieee80211_if_managed
*ifmgd
;
189 /* driver doesn't support power save */
190 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
193 /* hardware does dynamic power save */
194 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
197 /* dynamic power save disabled */
198 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
201 /* we are scanning, don't enable power save */
205 if (!local
->ps_sdata
)
208 /* No point if we're going to suspend */
209 if (local
->quiescing
)
212 /* dynamic ps is supported only in managed mode */
213 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
216 ifmgd
= &tx
->sdata
->u
.mgd
;
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
231 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
232 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
233 && skb_get_queue_mapping(tx
->skb
) == 0)
236 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
237 ieee80211_stop_queues_by_reason(&local
->hw
,
238 IEEE80211_QUEUE_STOP_REASON_PS
);
239 ieee80211_queue_work(&local
->hw
,
240 &local
->dynamic_ps_disable_work
);
243 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
244 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
253 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
254 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
257 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
260 if (unlikely(test_bit(SCAN_OFF_CHANNEL
, &tx
->local
->scanning
)) &&
261 !ieee80211_is_probe_req(hdr
->frame_control
) &&
262 !ieee80211_is_nullfunc(hdr
->frame_control
))
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
276 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
279 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
282 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
284 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
285 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
286 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
287 ieee80211_is_data(hdr
->frame_control
))) {
288 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
289 printk(KERN_DEBUG
"%s: dropped data frame to not "
290 "associated station %pM\n",
291 tx
->sdata
->name
, hdr
->addr1
);
292 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
293 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
297 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
298 tx
->local
->num_sta
== 0 &&
299 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
301 * No associated STAs - no need to send multicast
312 /* This function is called whenever the AP is about to exceed the maximum limit
313 * of buffered frames for power saving STAs. This situation should not really
314 * happen often during normal operation, so dropping the oldest buffered packet
315 * from each queue should be OK to make some room for new frames. */
316 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
318 int total
= 0, purged
= 0;
320 struct ieee80211_sub_if_data
*sdata
;
321 struct sta_info
*sta
;
324 * virtual interfaces are protected by RCU
328 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
329 struct ieee80211_if_ap
*ap
;
330 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
333 skb
= skb_dequeue(&ap
->ps_bc_buf
);
338 total
+= skb_queue_len(&ap
->ps_bc_buf
);
341 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
342 skb
= skb_dequeue(&sta
->ps_tx_buf
);
347 total
+= skb_queue_len(&sta
->ps_tx_buf
);
352 local
->total_ps_buffered
= total
;
353 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
354 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
359 static ieee80211_tx_result
360 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
362 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
363 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
366 * broadcast/multicast frame
368 * If any of the associated stations is in power save mode,
369 * the frame is buffered to be sent after DTIM beacon frame.
370 * This is done either by the hardware or us.
373 /* powersaving STAs only in AP/VLAN mode */
377 /* no buffering for ordered frames */
378 if (ieee80211_has_order(hdr
->frame_control
))
381 /* no stations in PS mode */
382 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
385 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
387 /* device releases frame after DTIM beacon */
388 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
391 /* buffered in mac80211 */
392 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
393 purge_old_ps_buffers(tx
->local
);
395 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
398 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
401 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
403 tx
->local
->total_ps_buffered
++;
405 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
410 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
413 if (!ieee80211_is_mgmt(fc
))
416 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
419 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
426 static ieee80211_tx_result
427 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
429 struct sta_info
*sta
= tx
->sta
;
430 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
431 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
432 struct ieee80211_local
*local
= tx
->local
;
436 ieee80211_is_probe_resp(hdr
->frame_control
) ||
437 ieee80211_is_auth(hdr
->frame_control
) ||
438 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
439 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
442 staflags
= get_sta_flags(sta
);
444 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
445 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
446 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
447 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
449 sta
->sta
.addr
, sta
->sta
.aid
,
450 skb_queue_len(&sta
->ps_tx_buf
));
451 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
452 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
453 purge_old_ps_buffers(tx
->local
);
454 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
455 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
456 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
457 if (net_ratelimit()) {
458 printk(KERN_DEBUG
"%s: STA %pM TX "
459 "buffer full - dropping oldest frame\n",
460 tx
->sdata
->name
, sta
->sta
.addr
);
465 tx
->local
->total_ps_buffered
++;
468 * Queue frame to be sent after STA wakes up/polls,
469 * but don't set the TIM bit if the driver is blocking
470 * wakeup or poll response transmissions anyway.
472 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
473 !(staflags
& WLAN_STA_PS_DRIVER
))
474 sta_info_set_tim_bit(sta
);
476 info
->control
.jiffies
= jiffies
;
477 info
->control
.vif
= &tx
->sdata
->vif
;
478 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
479 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
481 if (!timer_pending(&local
->sta_cleanup
))
482 mod_timer(&local
->sta_cleanup
,
483 round_jiffies(jiffies
+
484 STA_INFO_CLEANUP_INTERVAL
));
488 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
489 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
490 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
491 "set -> send frame\n", tx
->sdata
->name
,
494 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
499 static ieee80211_tx_result debug_noinline
500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
502 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
505 if (tx
->flags
& IEEE80211_TX_UNICAST
)
506 return ieee80211_tx_h_unicast_ps_buf(tx
);
508 return ieee80211_tx_h_multicast_ps_buf(tx
);
511 static ieee80211_tx_result debug_noinline
512 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
514 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
516 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
517 tx
->sdata
->control_port_no_encrypt
))
518 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
526 struct ieee80211_key
*key
= NULL
;
527 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
528 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
530 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
532 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
534 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
535 is_multicast_ether_addr(hdr
->addr1
) &&
536 ieee80211_is_robust_mgmt_frame(hdr
) &&
537 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
539 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
541 else if (tx
->sdata
->drop_unencrypted
&&
542 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
543 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
544 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
545 (ieee80211_is_action(hdr
->frame_control
) &&
546 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
547 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
553 bool skip_hw
= false;
555 tx
->key
->tx_rx_count
++;
556 /* TODO: add threshold stuff again */
558 switch (tx
->key
->conf
.cipher
) {
559 case WLAN_CIPHER_SUITE_WEP40
:
560 case WLAN_CIPHER_SUITE_WEP104
:
561 if (ieee80211_is_auth(hdr
->frame_control
))
563 case WLAN_CIPHER_SUITE_TKIP
:
564 if (!ieee80211_is_data_present(hdr
->frame_control
))
567 case WLAN_CIPHER_SUITE_CCMP
:
568 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
569 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
573 skip_hw
= (tx
->key
->conf
.flags
&
574 IEEE80211_KEY_FLAG_SW_MGMT
) &&
575 ieee80211_is_mgmt(hdr
->frame_control
);
577 case WLAN_CIPHER_SUITE_AES_CMAC
:
578 if (!ieee80211_is_mgmt(hdr
->frame_control
))
583 if (!skip_hw
&& tx
->key
&&
584 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
585 info
->control
.hw_key
= &tx
->key
->conf
;
591 static ieee80211_tx_result debug_noinline
592 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
594 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
595 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
596 struct ieee80211_supported_band
*sband
;
597 struct ieee80211_rate
*rate
;
600 bool inval
= false, rts
= false, short_preamble
= false;
601 struct ieee80211_tx_rate_control txrc
;
604 memset(&txrc
, 0, sizeof(txrc
));
606 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
608 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
609 tx
->local
->hw
.wiphy
->frag_threshold
);
611 /* set up the tx rate control struct we give the RC algo */
612 txrc
.hw
= local_to_hw(tx
->local
);
614 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
616 txrc
.reported_rate
.idx
= -1;
617 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
618 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
619 txrc
.max_rate_idx
= -1;
621 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
622 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
624 /* set up RTS protection if desired */
625 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
626 txrc
.rts
= rts
= true;
630 * Use short preamble if the BSS can handle it, but not for
631 * management frames unless we know the receiver can handle
632 * that -- the management frame might be to a station that
633 * just wants a probe response.
635 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
636 (ieee80211_is_data(hdr
->frame_control
) ||
637 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
638 txrc
.short_preamble
= short_preamble
= true;
640 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
643 * Lets not bother rate control if we're associated and cannot
644 * talk to the sta. This should not happen.
646 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
647 (sta_flags
& WLAN_STA_ASSOC
) &&
648 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
649 "%s: Dropped data frame as no usable bitrate found while "
650 "scanning and associated. Target station: "
651 "%pM on %d GHz band\n",
652 tx
->sdata
->name
, hdr
->addr1
,
653 tx
->channel
->band
? 5 : 2))
657 * If we're associated with the sta at this point we know we can at
658 * least send the frame at the lowest bit rate.
660 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
662 if (unlikely(info
->control
.rates
[0].idx
< 0))
665 if (txrc
.reported_rate
.idx
< 0)
666 txrc
.reported_rate
= info
->control
.rates
[0];
669 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
671 if (unlikely(!info
->control
.rates
[0].count
))
672 info
->control
.rates
[0].count
= 1;
674 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
675 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
676 info
->control
.rates
[0].count
= 1;
678 if (is_multicast_ether_addr(hdr
->addr1
)) {
680 * XXX: verify the rate is in the basic rateset
686 * set up the RTS/CTS rate as the fastest basic rate
687 * that is not faster than the data rate
689 * XXX: Should this check all retry rates?
691 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
694 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
696 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
697 /* must be a basic rate */
698 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
700 /* must not be faster than the data rate */
701 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
704 if (sband
->bitrates
[baserate
].bitrate
<
705 sband
->bitrates
[i
].bitrate
)
709 info
->control
.rts_cts_rate_idx
= baserate
;
712 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
714 * make sure there's no valid rate following
715 * an invalid one, just in case drivers don't
716 * take the API seriously to stop at -1.
719 info
->control
.rates
[i
].idx
= -1;
722 if (info
->control
.rates
[i
].idx
< 0) {
728 * For now assume MCS is already set up correctly, this
731 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
732 WARN_ON(info
->control
.rates
[i
].idx
> 76);
736 /* set up RTS protection if desired */
738 info
->control
.rates
[i
].flags
|=
739 IEEE80211_TX_RC_USE_RTS_CTS
;
742 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
743 sband
->n_bitrates
)) {
744 info
->control
.rates
[i
].idx
= -1;
748 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
750 /* set up short preamble */
751 if (short_preamble
&&
752 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
753 info
->control
.rates
[i
].flags
|=
754 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
756 /* set up G protection */
757 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
758 rate
->flags
& IEEE80211_RATE_ERP_G
)
759 info
->control
.rates
[i
].flags
|=
760 IEEE80211_TX_RC_USE_CTS_PROTECT
;
766 static ieee80211_tx_result debug_noinline
767 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
769 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
770 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
776 * Packet injection may want to control the sequence
777 * number, if we have no matching interface then we
778 * neither assign one ourselves nor ask the driver to.
780 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
783 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
786 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
790 * Anything but QoS data that has a sequence number field
791 * (is long enough) gets a sequence number from the global
794 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
795 /* driver should assign sequence number */
796 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
797 /* for pure STA mode without beacons, we can do it */
798 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
799 tx
->sdata
->sequence_number
+= 0x10;
804 * This should be true for injected/management frames only, for
805 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
806 * above since they are not QoS-data frames.
811 /* include per-STA, per-TID sequence counter */
813 qc
= ieee80211_get_qos_ctl(hdr
);
814 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
815 seq
= &tx
->sta
->tid_seq
[tid
];
817 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
819 /* Increase the sequence number. */
820 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
825 static int ieee80211_fragment(struct ieee80211_local
*local
,
826 struct sk_buff
*skb
, int hdrlen
,
829 struct sk_buff
*tail
= skb
, *tmp
;
830 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
831 int pos
= hdrlen
+ per_fragm
;
832 int rem
= skb
->len
- hdrlen
- per_fragm
;
834 if (WARN_ON(rem
< 0))
838 int fraglen
= per_fragm
;
843 tmp
= dev_alloc_skb(local
->tx_headroom
+
845 IEEE80211_ENCRYPT_HEADROOM
+
846 IEEE80211_ENCRYPT_TAILROOM
);
851 skb_reserve(tmp
, local
->tx_headroom
+
852 IEEE80211_ENCRYPT_HEADROOM
);
853 /* copy control information */
854 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
855 skb_copy_queue_mapping(tmp
, skb
);
856 tmp
->priority
= skb
->priority
;
859 /* copy header and data */
860 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
861 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
866 skb
->len
= hdrlen
+ per_fragm
;
870 static ieee80211_tx_result debug_noinline
871 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
873 struct sk_buff
*skb
= tx
->skb
;
874 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
875 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
876 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
880 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
884 * Warn when submitting a fragmented A-MPDU frame and drop it.
885 * This scenario is handled in ieee80211_tx_prepare but extra
886 * caution taken here as fragmented ampdu may cause Tx stop.
888 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
891 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
893 /* internal error, why is TX_FRAGMENTED set? */
894 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
898 * Now fragment the frame. This will allocate all the fragments and
899 * chain them (using skb as the first fragment) to skb->next.
900 * During transmission, we will remove the successfully transmitted
901 * fragments from this list. When the low-level driver rejects one
902 * of the fragments then we will simply pretend to accept the skb
903 * but store it away as pending.
905 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
908 /* update duration/seq/flags of fragments */
912 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
914 hdr
= (void *)skb
->data
;
915 info
= IEEE80211_SKB_CB(skb
);
918 hdr
->frame_control
|= morefrags
;
919 next_len
= skb
->next
->len
;
921 * No multi-rate retries for fragmented frames, that
922 * would completely throw off the NAV at other STAs.
924 info
->control
.rates
[1].idx
= -1;
925 info
->control
.rates
[2].idx
= -1;
926 info
->control
.rates
[3].idx
= -1;
927 info
->control
.rates
[4].idx
= -1;
928 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
929 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
931 hdr
->frame_control
&= ~morefrags
;
934 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
935 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
937 } while ((skb
= skb
->next
));
942 static ieee80211_tx_result debug_noinline
943 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
945 struct sk_buff
*skb
= tx
->skb
;
950 tx
->sta
->tx_packets
++;
952 tx
->sta
->tx_fragments
++;
953 tx
->sta
->tx_bytes
+= skb
->len
;
954 } while ((skb
= skb
->next
));
959 static ieee80211_tx_result debug_noinline
960 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
962 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
967 switch (tx
->key
->conf
.cipher
) {
968 case WLAN_CIPHER_SUITE_WEP40
:
969 case WLAN_CIPHER_SUITE_WEP104
:
970 return ieee80211_crypto_wep_encrypt(tx
);
971 case WLAN_CIPHER_SUITE_TKIP
:
972 return ieee80211_crypto_tkip_encrypt(tx
);
973 case WLAN_CIPHER_SUITE_CCMP
:
974 return ieee80211_crypto_ccmp_encrypt(tx
);
975 case WLAN_CIPHER_SUITE_AES_CMAC
:
976 return ieee80211_crypto_aes_cmac_encrypt(tx
);
978 /* handle hw-only algorithm */
979 if (info
->control
.hw_key
) {
980 ieee80211_tx_set_protected(tx
);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
993 struct sk_buff
*skb
= tx
->skb
;
994 struct ieee80211_hdr
*hdr
;
999 hdr
= (void *) skb
->data
;
1000 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1001 break; /* must not overwrite AID */
1002 next_len
= skb
->next
? skb
->next
->len
: 0;
1003 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1006 ieee80211_duration(tx
, group_addr
, next_len
);
1007 } while ((skb
= skb
->next
));
1012 /* actual transmit path */
1015 * deal with packet injection down monitor interface
1016 * with Radiotap Header -- only called for monitor mode interface
1018 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1019 struct sk_buff
*skb
)
1022 * this is the moment to interpret and discard the radiotap header that
1023 * must be at the start of the packet injected in Monitor mode
1025 * Need to take some care with endian-ness since radiotap
1026 * args are little-endian
1029 struct ieee80211_radiotap_iterator iterator
;
1030 struct ieee80211_radiotap_header
*rthdr
=
1031 (struct ieee80211_radiotap_header
*) skb
->data
;
1032 struct ieee80211_supported_band
*sband
;
1033 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1034 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1037 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
1039 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1040 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1043 * for every radiotap entry that is present
1044 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1045 * entries present, or -EINVAL on error)
1049 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1054 /* see if this argument is something we can use */
1055 switch (iterator
.this_arg_index
) {
1057 * You must take care when dereferencing iterator.this_arg
1058 * for multibyte types... the pointer is not aligned. Use
1059 * get_unaligned((type *)iterator.this_arg) to dereference
1060 * iterator.this_arg for type "type" safely on all arches.
1062 case IEEE80211_RADIOTAP_FLAGS
:
1063 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1065 * this indicates that the skb we have been
1066 * handed has the 32-bit FCS CRC at the end...
1067 * we should react to that by snipping it off
1068 * because it will be recomputed and added
1071 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1074 skb_trim(skb
, skb
->len
- FCS_LEN
);
1076 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1077 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1078 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1079 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1083 * Please update the file
1084 * Documentation/networking/mac80211-injection.txt
1085 * when parsing new fields here.
1093 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1097 * remove the radiotap header
1098 * iterator->_max_length was sanity-checked against
1099 * skb->len by iterator init
1101 skb_pull(skb
, iterator
._max_length
);
1106 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1107 struct sk_buff
*skb
,
1108 struct ieee80211_tx_info
*info
,
1109 struct tid_ampdu_tx
*tid_tx
,
1112 bool queued
= false;
1114 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1115 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1116 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1118 * nothing -- this aggregation session is being started
1119 * but that might still fail with the driver
1122 spin_lock(&tx
->sta
->lock
);
1124 * Need to re-check now, because we may get here
1126 * 1) in the window during which the setup is actually
1127 * already done, but not marked yet because not all
1128 * packets are spliced over to the driver pending
1129 * queue yet -- if this happened we acquire the lock
1130 * either before or after the splice happens, but
1131 * need to recheck which of these cases happened.
1133 * 2) during session teardown, if the OPERATIONAL bit
1134 * was cleared due to the teardown but the pointer
1135 * hasn't been assigned NULL yet (or we loaded it
1136 * before it was assigned) -- in this case it may
1137 * now be NULL which means we should just let the
1138 * packet pass through because splicing the frames
1139 * back is already done.
1141 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1144 /* do nothing, let packet pass through */
1145 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1146 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1149 info
->control
.vif
= &tx
->sdata
->vif
;
1150 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1151 __skb_queue_tail(&tid_tx
->pending
, skb
);
1153 spin_unlock(&tx
->sta
->lock
);
1162 static ieee80211_tx_result
1163 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1164 struct ieee80211_tx_data
*tx
,
1165 struct sk_buff
*skb
)
1167 struct ieee80211_local
*local
= sdata
->local
;
1168 struct ieee80211_hdr
*hdr
;
1169 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1173 memset(tx
, 0, sizeof(*tx
));
1177 tx
->channel
= local
->hw
.conf
.channel
;
1179 * Set this flag (used below to indicate "automatic fragmentation"),
1180 * it will be cleared/left by radiotap as desired.
1182 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1184 /* process and remove the injection radiotap header */
1185 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1186 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1190 * __ieee80211_parse_tx_radiotap has now removed
1191 * the radiotap header that was present and pre-filled
1192 * 'tx' with tx control information.
1194 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1198 * If this flag is set to true anywhere, and we get here,
1199 * we are doing the needed processing, so remove the flag
1202 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1204 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1206 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1207 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1208 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1210 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1211 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1214 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1216 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1217 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1218 struct tid_ampdu_tx
*tid_tx
;
1220 qc
= ieee80211_get_qos_ctl(hdr
);
1221 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1223 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1227 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1230 if (unlikely(queued
))
1235 if (is_multicast_ether_addr(hdr
->addr1
)) {
1236 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1237 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1239 tx
->flags
|= IEEE80211_TX_UNICAST
;
1240 if (unlikely(local
->wifi_wme_noack_test
))
1241 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1243 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1246 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1247 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1248 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1249 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1250 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1252 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1256 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1257 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1258 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1260 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1261 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1262 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1263 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1265 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1270 static int __ieee80211_tx(struct ieee80211_local
*local
,
1271 struct sk_buff
**skbp
,
1272 struct sta_info
*sta
,
1275 struct sk_buff
*skb
= *skbp
, *next
;
1276 struct ieee80211_tx_info
*info
;
1277 struct ieee80211_sub_if_data
*sdata
;
1278 unsigned long flags
;
1283 int q
= skb_get_queue_mapping(skb
);
1285 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1286 ret
= IEEE80211_TX_OK
;
1287 if (local
->queue_stop_reasons
[q
] ||
1288 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1289 ret
= IEEE80211_TX_PENDING
;
1290 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1291 if (ret
!= IEEE80211_TX_OK
)
1294 info
= IEEE80211_SKB_CB(skb
);
1297 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1298 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1304 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1306 sdata
= vif_to_sdata(info
->control
.vif
);
1308 switch (sdata
->vif
.type
) {
1309 case NL80211_IFTYPE_MONITOR
:
1310 info
->control
.vif
= NULL
;
1312 case NL80211_IFTYPE_AP_VLAN
:
1313 info
->control
.vif
= &container_of(sdata
->bss
,
1314 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1321 if (sta
&& sta
->uploaded
)
1322 info
->control
.sta
= &sta
->sta
;
1324 info
->control
.sta
= NULL
;
1326 ret
= drv_tx(local
, skb
);
1327 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1331 if (ret
!= NETDEV_TX_OK
) {
1332 info
->control
.vif
= &sdata
->vif
;
1333 return IEEE80211_TX_AGAIN
;
1337 ieee80211_led_tx(local
, 1);
1341 return IEEE80211_TX_OK
;
1345 * Invoke TX handlers, return 0 on success and non-zero if the
1346 * frame was dropped or queued.
1348 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1350 struct sk_buff
*skb
= tx
->skb
;
1351 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1352 ieee80211_tx_result res
= TX_DROP
;
1354 #define CALL_TXH(txh) \
1357 if (res != TX_CONTINUE) \
1361 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1362 CALL_TXH(ieee80211_tx_h_check_assoc
);
1363 CALL_TXH(ieee80211_tx_h_ps_buf
);
1364 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1365 CALL_TXH(ieee80211_tx_h_select_key
);
1366 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1367 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1369 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1372 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1373 CALL_TXH(ieee80211_tx_h_sequence
);
1374 CALL_TXH(ieee80211_tx_h_fragment
);
1375 /* handlers after fragment must be aware of tx info fragmentation! */
1376 CALL_TXH(ieee80211_tx_h_stats
);
1377 CALL_TXH(ieee80211_tx_h_encrypt
);
1378 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1382 if (unlikely(res
== TX_DROP
)) {
1383 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1385 struct sk_buff
*next
;
1392 } else if (unlikely(res
== TX_QUEUED
)) {
1393 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1400 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1401 struct sk_buff
*skb
, bool txpending
)
1403 struct ieee80211_local
*local
= sdata
->local
;
1404 struct ieee80211_tx_data tx
;
1405 ieee80211_tx_result res_prepare
;
1406 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1407 struct sk_buff
*next
;
1408 unsigned long flags
;
1412 queue
= skb_get_queue_mapping(skb
);
1414 if (unlikely(skb
->len
< 10)) {
1421 /* initialises tx */
1422 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1424 if (unlikely(res_prepare
== TX_DROP
)) {
1428 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1433 tx
.channel
= local
->hw
.conf
.channel
;
1434 info
->band
= tx
.channel
->band
;
1436 if (invoke_tx_handlers(&tx
))
1441 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1443 case IEEE80211_TX_OK
:
1445 case IEEE80211_TX_AGAIN
:
1447 * Since there are no fragmented frames on A-MPDU
1448 * queues, there's no reason for a driver to reject
1449 * a frame there, warn and drop it.
1451 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1454 case IEEE80211_TX_PENDING
:
1457 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1459 if (local
->queue_stop_reasons
[queue
] ||
1460 !skb_queue_empty(&local
->pending
[queue
])) {
1462 * if queue is stopped, queue up frames for later
1463 * transmission from the tasklet
1468 if (unlikely(txpending
))
1469 __skb_queue_head(&local
->pending
[queue
],
1472 __skb_queue_tail(&local
->pending
[queue
],
1474 } while ((skb
= next
));
1476 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1480 * otherwise retry, but this is a race condition or
1481 * a driver bug (which we warn about if it persists)
1483 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1487 if (WARN(retries
> 10, "tx refused but queue active\n"))
1507 /* device xmit handlers */
1509 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1510 struct sk_buff
*skb
,
1511 int head_need
, bool may_encrypt
)
1516 * This could be optimised, devices that do full hardware
1517 * crypto (including TKIP MMIC) need no tailroom... But we
1518 * have no drivers for such devices currently.
1521 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1522 tail_need
-= skb_tailroom(skb
);
1523 tail_need
= max_t(int, tail_need
, 0);
1526 if (head_need
|| tail_need
) {
1527 /* Sorry. Can't account for this any more */
1531 if (skb_header_cloned(skb
))
1532 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1534 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1536 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1537 wiphy_debug(local
->hw
.wiphy
,
1538 "failed to reallocate TX buffer\n");
1542 /* update truesize too */
1543 skb
->truesize
+= head_need
+ tail_need
;
1548 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1549 struct sk_buff
*skb
)
1551 struct ieee80211_local
*local
= sdata
->local
;
1552 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1553 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1554 struct ieee80211_sub_if_data
*tmp_sdata
;
1560 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1564 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1565 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1567 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1568 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1569 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1571 /* check the header is complete in the frame */
1572 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1574 * We process outgoing injected frames that have a
1575 * local address we handle as though they are our
1577 * This code here isn't entirely correct, the local
1578 * MAC address is not necessarily enough to find
1579 * the interface to use; for that proper VLAN/WDS
1580 * support we will need a different mechanism.
1583 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1585 if (!ieee80211_sdata_running(tmp_sdata
))
1587 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1589 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1598 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1600 headroom
= local
->tx_headroom
;
1602 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1603 headroom
-= skb_headroom(skb
);
1604 headroom
= max_t(int, 0, headroom
);
1606 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1612 info
->control
.vif
= &sdata
->vif
;
1614 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1615 ieee80211_is_data(hdr
->frame_control
) &&
1616 !is_multicast_ether_addr(hdr
->addr1
))
1617 if (mesh_nexthop_lookup(skb
, sdata
)) {
1618 /* skb queued: don't free */
1623 ieee80211_set_qos_hdr(local
, skb
);
1624 ieee80211_tx(sdata
, skb
, false);
1628 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1629 struct net_device
*dev
)
1631 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1632 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1633 struct ieee80211_radiotap_header
*prthdr
=
1634 (struct ieee80211_radiotap_header
*)skb
->data
;
1635 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1639 * Frame injection is not allowed if beaconing is not allowed
1640 * or if we need radar detection. Beaconing is usually not allowed when
1641 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1642 * Passive scan is also used in world regulatory domains where
1643 * your country is not known and as such it should be treated as
1644 * NO TX unless the channel is explicitly allowed in which case
1645 * your current regulatory domain would not have the passive scan
1648 * Since AP mode uses monitor interfaces to inject/TX management
1649 * frames we can make AP mode the exception to this rule once it
1650 * supports radar detection as its implementation can deal with
1651 * radar detection by itself. We can do that later by adding a
1652 * monitor flag interfaces used for AP support.
1654 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1655 IEEE80211_CHAN_PASSIVE_SCAN
)))
1658 /* check for not even having the fixed radiotap header part */
1659 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1660 goto fail
; /* too short to be possibly valid */
1662 /* is it a header version we can trust to find length from? */
1663 if (unlikely(prthdr
->it_version
))
1664 goto fail
; /* only version 0 is supported */
1666 /* then there must be a radiotap header with a length we can use */
1667 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1669 /* does the skb contain enough to deliver on the alleged length? */
1670 if (unlikely(skb
->len
< len_rthdr
))
1671 goto fail
; /* skb too short for claimed rt header extent */
1674 * fix up the pointers accounting for the radiotap
1675 * header still being in there. We are being given
1676 * a precooked IEEE80211 header so no need for
1679 skb_set_mac_header(skb
, len_rthdr
);
1681 * these are just fixed to the end of the rt area since we
1682 * don't have any better information and at this point, nobody cares
1684 skb_set_network_header(skb
, len_rthdr
);
1685 skb_set_transport_header(skb
, len_rthdr
);
1687 memset(info
, 0, sizeof(*info
));
1689 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1691 /* pass the radiotap header up to xmit */
1692 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1693 return NETDEV_TX_OK
;
1697 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1701 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1702 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1703 * @skb: packet to be sent
1704 * @dev: incoming interface
1706 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1707 * not be freed, and caller is responsible for either retrying later or freeing
1710 * This function takes in an Ethernet header and encapsulates it with suitable
1711 * IEEE 802.11 header based on which interface the packet is coming in. The
1712 * encapsulated packet will then be passed to master interface, wlan#.11, for
1713 * transmission (through low-level driver).
1715 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1716 struct net_device
*dev
)
1718 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1719 struct ieee80211_local
*local
= sdata
->local
;
1720 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1721 int ret
= NETDEV_TX_BUSY
, head_need
;
1722 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1724 struct ieee80211_hdr hdr
;
1725 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1726 const u8
*encaps_data
;
1727 int encaps_len
, skip_header_bytes
;
1729 struct sta_info
*sta
= NULL
;
1732 if (unlikely(skb
->len
< ETH_HLEN
)) {
1737 nh_pos
= skb_network_header(skb
) - skb
->data
;
1738 h_pos
= skb_transport_header(skb
) - skb
->data
;
1740 /* convert Ethernet header to proper 802.11 header (based on
1741 * operation mode) */
1742 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1743 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1745 switch (sdata
->vif
.type
) {
1746 case NL80211_IFTYPE_AP_VLAN
:
1748 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1750 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1752 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1753 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1754 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1755 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1757 sta_flags
= get_sta_flags(sta
);
1763 case NL80211_IFTYPE_AP
:
1764 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1766 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1767 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1768 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1771 case NL80211_IFTYPE_WDS
:
1772 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1774 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1775 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1776 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1777 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1780 #ifdef CONFIG_MAC80211_MESH
1781 case NL80211_IFTYPE_MESH_POINT
:
1782 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1783 /* Do not send frames with mesh_ttl == 0 */
1784 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1789 if (compare_ether_addr(sdata
->vif
.addr
,
1790 skb
->data
+ ETH_ALEN
) == 0) {
1791 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1792 skb
->data
, skb
->data
+ ETH_ALEN
);
1793 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1794 sdata
, NULL
, NULL
, NULL
);
1796 /* packet from other interface */
1797 struct mesh_path
*mppath
;
1798 int is_mesh_mcast
= 1;
1802 if (is_multicast_ether_addr(skb
->data
))
1803 /* DA TA mSA AE:SA */
1804 mesh_da
= skb
->data
;
1806 static const u8 bcast
[ETH_ALEN
] =
1807 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1809 mppath
= mpp_path_lookup(skb
->data
, sdata
);
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
,
1831 ieee80211_new_mesh_header(&mesh_hdr
,
1835 skb
->data
+ ETH_ALEN
);
1840 case NL80211_IFTYPE_STATION
:
1841 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1842 if (sdata
->u
.mgd
.use_4addr
&&
1843 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1844 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1846 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1847 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1848 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1851 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1853 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1854 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1858 case NL80211_IFTYPE_ADHOC
:
1860 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1861 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1862 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1871 * There's no need to try to look up the destination
1872 * if it is a multicast address (which can only happen
1875 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1877 sta
= sta_info_get(sdata
, hdr
.addr1
);
1879 sta_flags
= get_sta_flags(sta
);
1883 /* receiver and we are QoS enabled, use a QoS type frame */
1884 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1885 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1890 * Drop unicast frames to unauthorised stations unless they are
1891 * EAPOL frames from the local station.
1893 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1894 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1895 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1896 !(cpu_to_be16(ethertype
) == sdata
->control_port_protocol
&&
1897 compare_ether_addr(sdata
->vif
.addr
,
1898 skb
->data
+ ETH_ALEN
) == 0))) {
1899 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1900 if (net_ratelimit())
1901 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1902 " (unauthorized port)\n", dev
->name
,
1906 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1912 hdr
.frame_control
= fc
;
1913 hdr
.duration_id
= 0;
1916 skip_header_bytes
= ETH_HLEN
;
1917 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1918 encaps_data
= bridge_tunnel_header
;
1919 encaps_len
= sizeof(bridge_tunnel_header
);
1920 skip_header_bytes
-= 2;
1921 } else if (ethertype
>= 0x600) {
1922 encaps_data
= rfc1042_header
;
1923 encaps_len
= sizeof(rfc1042_header
);
1924 skip_header_bytes
-= 2;
1930 skb_pull(skb
, skip_header_bytes
);
1931 nh_pos
-= skip_header_bytes
;
1932 h_pos
-= skip_header_bytes
;
1934 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1937 * So we need to modify the skb header and hence need a copy of
1938 * that. The head_need variable above doesn't, so far, include
1939 * the needed header space that we don't need right away. If we
1940 * can, then we don't reallocate right now but only after the
1941 * frame arrives at the master device (if it does...)
1943 * If we cannot, however, then we will reallocate to include all
1944 * the ever needed space. Also, if we need to reallocate it anyway,
1945 * make it big enough for everything we may ever need.
1948 if (head_need
> 0 || skb_cloned(skb
)) {
1949 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1950 head_need
+= local
->tx_headroom
;
1951 head_need
= max_t(int, 0, head_need
);
1952 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1957 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1958 nh_pos
+= encaps_len
;
1959 h_pos
+= encaps_len
;
1962 #ifdef CONFIG_MAC80211_MESH
1963 if (meshhdrlen
> 0) {
1964 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1965 nh_pos
+= meshhdrlen
;
1966 h_pos
+= meshhdrlen
;
1970 if (ieee80211_is_data_qos(fc
)) {
1971 __le16
*qos_control
;
1973 qos_control
= (__le16
*) skb_push(skb
, 2);
1974 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1976 * Maybe we could actually set some fields here, for now just
1977 * initialise to zero to indicate no special operation.
1981 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1986 dev
->stats
.tx_packets
++;
1987 dev
->stats
.tx_bytes
+= skb
->len
;
1989 /* Update skb pointers to various headers since this modified frame
1990 * is going to go through Linux networking code that may potentially
1991 * need things like pointer to IP header. */
1992 skb_set_mac_header(skb
, 0);
1993 skb_set_network_header(skb
, nh_pos
);
1994 skb_set_transport_header(skb
, h_pos
);
1996 memset(info
, 0, sizeof(*info
));
1998 dev
->trans_start
= jiffies
;
1999 ieee80211_xmit(sdata
, skb
);
2001 return NETDEV_TX_OK
;
2004 if (ret
== NETDEV_TX_OK
)
2012 * ieee80211_clear_tx_pending may not be called in a context where
2013 * it is possible that it packets could come in again.
2015 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2019 for (i
= 0; i
< local
->hw
.queues
; i
++)
2020 skb_queue_purge(&local
->pending
[i
]);
2023 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2024 struct sk_buff
*skb
)
2026 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2027 struct ieee80211_sub_if_data
*sdata
;
2028 struct sta_info
*sta
;
2029 struct ieee80211_hdr
*hdr
;
2033 sdata
= vif_to_sdata(info
->control
.vif
);
2035 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2036 ieee80211_tx(sdata
, skb
, true);
2038 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2039 sta
= sta_info_get(sdata
, hdr
->addr1
);
2041 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
2042 if (ret
!= IEEE80211_TX_OK
)
2050 * Transmit all pending packets. Called from tasklet.
2052 void ieee80211_tx_pending(unsigned long data
)
2054 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2055 struct ieee80211_sub_if_data
*sdata
;
2056 unsigned long flags
;
2062 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2063 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2065 * If queue is stopped by something other than due to pending
2066 * frames, or we have no pending frames, proceed to next queue.
2068 if (local
->queue_stop_reasons
[i
] ||
2069 skb_queue_empty(&local
->pending
[i
]))
2072 while (!skb_queue_empty(&local
->pending
[i
])) {
2073 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2074 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2076 if (WARN_ON(!info
->control
.vif
)) {
2081 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2084 txok
= ieee80211_tx_pending_skb(local
, skb
);
2086 __skb_queue_head(&local
->pending
[i
], skb
);
2087 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2093 if (skb_queue_empty(&local
->pending
[i
]))
2094 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2095 netif_tx_wake_queue(
2096 netdev_get_tx_queue(sdata
->dev
, i
));
2098 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2103 /* functions for drivers to get certain frames */
2105 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2106 struct sk_buff
*skb
,
2107 struct beacon_data
*beacon
)
2111 int i
, have_bits
= 0, n1
, n2
;
2113 /* Generate bitmap for TIM only if there are any STAs in power save
2115 if (atomic_read(&bss
->num_sta_ps
) > 0)
2116 /* in the hope that this is faster than
2117 * checking byte-for-byte */
2118 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2119 IEEE80211_MAX_AID
+1);
2121 if (bss
->dtim_count
== 0)
2122 bss
->dtim_count
= beacon
->dtim_period
- 1;
2126 tim
= pos
= (u8
*) skb_put(skb
, 6);
2127 *pos
++ = WLAN_EID_TIM
;
2129 *pos
++ = bss
->dtim_count
;
2130 *pos
++ = beacon
->dtim_period
;
2132 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2136 /* Find largest even number N1 so that bits numbered 1 through
2137 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2138 * (N2 + 1) x 8 through 2007 are 0. */
2140 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2147 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2154 /* Bitmap control */
2156 /* Part Virt Bitmap */
2157 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2159 tim
[1] = n2
- n1
+ 4;
2160 skb_put(skb
, n2
- n1
);
2162 *pos
++ = aid0
; /* Bitmap control */
2163 *pos
++ = 0; /* Part Virt Bitmap */
2167 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2168 struct ieee80211_vif
*vif
,
2169 u16
*tim_offset
, u16
*tim_length
)
2171 struct ieee80211_local
*local
= hw_to_local(hw
);
2172 struct sk_buff
*skb
= NULL
;
2173 struct ieee80211_tx_info
*info
;
2174 struct ieee80211_sub_if_data
*sdata
= NULL
;
2175 struct ieee80211_if_ap
*ap
= NULL
;
2176 struct beacon_data
*beacon
;
2177 struct ieee80211_supported_band
*sband
;
2178 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2179 struct ieee80211_tx_rate_control txrc
;
2181 sband
= local
->hw
.wiphy
->bands
[band
];
2185 sdata
= vif_to_sdata(vif
);
2192 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2194 beacon
= rcu_dereference(ap
->beacon
);
2197 * headroom, head length,
2198 * tail length and maximum TIM length
2200 skb
= dev_alloc_skb(local
->tx_headroom
+
2202 beacon
->tail_len
+ 256);
2206 skb_reserve(skb
, local
->tx_headroom
);
2207 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2211 * Not very nice, but we want to allow the driver to call
2212 * ieee80211_beacon_get() as a response to the set_tim()
2213 * callback. That, however, is already invoked under the
2214 * sta_lock to guarantee consistent and race-free update
2215 * of the tim bitmap in mac80211 and the driver.
2217 if (local
->tim_in_locked_section
) {
2218 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2220 unsigned long flags
;
2222 spin_lock_irqsave(&local
->sta_lock
, flags
);
2223 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2224 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2228 *tim_offset
= beacon
->head_len
;
2230 *tim_length
= skb
->len
- beacon
->head_len
;
2233 memcpy(skb_put(skb
, beacon
->tail_len
),
2234 beacon
->tail
, beacon
->tail_len
);
2237 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2238 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2239 struct ieee80211_hdr
*hdr
;
2240 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2245 skb
= skb_copy(presp
, GFP_ATOMIC
);
2249 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2250 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2251 IEEE80211_STYPE_BEACON
);
2252 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2253 struct ieee80211_mgmt
*mgmt
;
2256 /* headroom, head length, tail length and maximum TIM length */
2257 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2261 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2262 mgmt
= (struct ieee80211_mgmt
*)
2263 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2264 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2265 mgmt
->frame_control
=
2266 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2267 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2268 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2269 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2270 mgmt
->u
.beacon
.beacon_int
=
2271 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2272 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2274 pos
= skb_put(skb
, 2);
2275 *pos
++ = WLAN_EID_SSID
;
2278 mesh_mgmt_ies_add(skb
, sdata
);
2284 info
= IEEE80211_SKB_CB(skb
);
2286 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2287 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2290 memset(&txrc
, 0, sizeof(txrc
));
2293 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2295 txrc
.reported_rate
.idx
= -1;
2296 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2297 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2298 txrc
.max_rate_idx
= -1;
2300 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2302 rate_control_get_rate(sdata
, NULL
, &txrc
);
2304 info
->control
.vif
= vif
;
2306 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2307 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2308 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2313 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2315 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2316 struct ieee80211_vif
*vif
)
2318 struct ieee80211_sub_if_data
*sdata
;
2319 struct ieee80211_if_managed
*ifmgd
;
2320 struct ieee80211_pspoll
*pspoll
;
2321 struct ieee80211_local
*local
;
2322 struct sk_buff
*skb
;
2324 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2327 sdata
= vif_to_sdata(vif
);
2328 ifmgd
= &sdata
->u
.mgd
;
2329 local
= sdata
->local
;
2331 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2333 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2334 "pspoll template\n", sdata
->name
);
2337 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2339 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2340 memset(pspoll
, 0, sizeof(*pspoll
));
2341 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2342 IEEE80211_STYPE_PSPOLL
);
2343 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2345 /* aid in PS-Poll has its two MSBs each set to 1 */
2346 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2348 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2349 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2353 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2355 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2356 struct ieee80211_vif
*vif
)
2358 struct ieee80211_hdr_3addr
*nullfunc
;
2359 struct ieee80211_sub_if_data
*sdata
;
2360 struct ieee80211_if_managed
*ifmgd
;
2361 struct ieee80211_local
*local
;
2362 struct sk_buff
*skb
;
2364 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2367 sdata
= vif_to_sdata(vif
);
2368 ifmgd
= &sdata
->u
.mgd
;
2369 local
= sdata
->local
;
2371 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2373 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2374 "template\n", sdata
->name
);
2377 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2379 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2381 memset(nullfunc
, 0, sizeof(*nullfunc
));
2382 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2383 IEEE80211_STYPE_NULLFUNC
|
2384 IEEE80211_FCTL_TODS
);
2385 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2386 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2387 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2391 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2393 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2394 struct ieee80211_vif
*vif
,
2395 const u8
*ssid
, size_t ssid_len
,
2396 const u8
*ie
, size_t ie_len
)
2398 struct ieee80211_sub_if_data
*sdata
;
2399 struct ieee80211_local
*local
;
2400 struct ieee80211_hdr_3addr
*hdr
;
2401 struct sk_buff
*skb
;
2405 sdata
= vif_to_sdata(vif
);
2406 local
= sdata
->local
;
2407 ie_ssid_len
= 2 + ssid_len
;
2409 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2410 ie_ssid_len
+ ie_len
);
2412 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2413 "request template\n", sdata
->name
);
2417 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2419 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2420 memset(hdr
, 0, sizeof(*hdr
));
2421 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2422 IEEE80211_STYPE_PROBE_REQ
);
2423 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2424 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2425 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2427 pos
= skb_put(skb
, ie_ssid_len
);
2428 *pos
++ = WLAN_EID_SSID
;
2431 memcpy(pos
, ssid
, ssid_len
);
2435 pos
= skb_put(skb
, ie_len
);
2436 memcpy(pos
, ie
, ie_len
);
2441 EXPORT_SYMBOL(ieee80211_probereq_get
);
2443 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2444 const void *frame
, size_t frame_len
,
2445 const struct ieee80211_tx_info
*frame_txctl
,
2446 struct ieee80211_rts
*rts
)
2448 const struct ieee80211_hdr
*hdr
= frame
;
2450 rts
->frame_control
=
2451 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2452 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2454 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2455 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2457 EXPORT_SYMBOL(ieee80211_rts_get
);
2459 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2460 const void *frame
, size_t frame_len
,
2461 const struct ieee80211_tx_info
*frame_txctl
,
2462 struct ieee80211_cts
*cts
)
2464 const struct ieee80211_hdr
*hdr
= frame
;
2466 cts
->frame_control
=
2467 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2468 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2469 frame_len
, frame_txctl
);
2470 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2472 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2475 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2476 struct ieee80211_vif
*vif
)
2478 struct ieee80211_local
*local
= hw_to_local(hw
);
2479 struct sk_buff
*skb
= NULL
;
2480 struct sta_info
*sta
;
2481 struct ieee80211_tx_data tx
;
2482 struct ieee80211_sub_if_data
*sdata
;
2483 struct ieee80211_if_ap
*bss
= NULL
;
2484 struct beacon_data
*beacon
;
2485 struct ieee80211_tx_info
*info
;
2487 sdata
= vif_to_sdata(vif
);
2491 beacon
= rcu_dereference(bss
->beacon
);
2493 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2496 if (bss
->dtim_count
!= 0)
2497 goto out
; /* send buffered bc/mc only after DTIM beacon */
2500 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2503 local
->total_ps_buffered
--;
2505 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2506 struct ieee80211_hdr
*hdr
=
2507 (struct ieee80211_hdr
*) skb
->data
;
2508 /* more buffered multicast/broadcast frames ==> set
2509 * MoreData flag in IEEE 802.11 header to inform PS
2511 hdr
->frame_control
|=
2512 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2515 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2517 dev_kfree_skb_any(skb
);
2520 info
= IEEE80211_SKB_CB(skb
);
2523 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2524 tx
.channel
= local
->hw
.conf
.channel
;
2525 info
->band
= tx
.channel
->band
;
2527 if (invoke_tx_handlers(&tx
))
2534 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2536 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2538 skb_set_mac_header(skb
, 0);
2539 skb_set_network_header(skb
, 0);
2540 skb_set_transport_header(skb
, 0);
2542 /* send all internal mgmt frames on VO */
2543 skb_set_queue_mapping(skb
, 0);
2546 * The other path calling ieee80211_xmit is from the tasklet,
2547 * and while we can handle concurrent transmissions locking
2548 * requirements are that we do not come into tx with bhs on.
2551 ieee80211_xmit(sdata
, skb
);