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
;
218 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
219 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
220 && skb_get_queue_mapping(tx
->skb
) == 0)
223 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
224 ieee80211_stop_queues_by_reason(&local
->hw
,
225 IEEE80211_QUEUE_STOP_REASON_PS
);
226 ieee80211_queue_work(&local
->hw
,
227 &local
->dynamic_ps_disable_work
);
230 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
231 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
236 static ieee80211_tx_result debug_noinline
237 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
240 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
241 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
244 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
247 if (unlikely(test_bit(SCAN_OFF_CHANNEL
, &tx
->local
->scanning
)) &&
248 !ieee80211_is_probe_req(hdr
->frame_control
) &&
249 !ieee80211_is_nullfunc(hdr
->frame_control
))
251 * When software scanning only nullfunc frames (to notify
252 * the sleep state to the AP) and probe requests (for the
253 * active scan) are allowed, all other frames should not be
254 * sent and we should not get here, but if we do
255 * nonetheless, drop them to avoid sending them
256 * off-channel. See the link below and
257 * ieee80211_start_scan() for more.
259 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
263 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
266 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
269 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
271 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
272 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
273 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
274 ieee80211_is_data(hdr
->frame_control
))) {
275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
276 printk(KERN_DEBUG
"%s: dropped data frame to not "
277 "associated station %pM\n",
278 tx
->sdata
->name
, hdr
->addr1
);
279 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
280 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
284 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
285 tx
->local
->num_sta
== 0 &&
286 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
288 * No associated STAs - no need to send multicast
299 /* This function is called whenever the AP is about to exceed the maximum limit
300 * of buffered frames for power saving STAs. This situation should not really
301 * happen often during normal operation, so dropping the oldest buffered packet
302 * from each queue should be OK to make some room for new frames. */
303 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
305 int total
= 0, purged
= 0;
307 struct ieee80211_sub_if_data
*sdata
;
308 struct sta_info
*sta
;
311 * virtual interfaces are protected by RCU
315 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
316 struct ieee80211_if_ap
*ap
;
317 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
320 skb
= skb_dequeue(&ap
->ps_bc_buf
);
325 total
+= skb_queue_len(&ap
->ps_bc_buf
);
328 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
329 skb
= skb_dequeue(&sta
->ps_tx_buf
);
334 total
+= skb_queue_len(&sta
->ps_tx_buf
);
339 local
->total_ps_buffered
= total
;
340 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
341 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
342 wiphy_name(local
->hw
.wiphy
), purged
);
346 static ieee80211_tx_result
347 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
349 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
350 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
353 * broadcast/multicast frame
355 * If any of the associated stations is in power save mode,
356 * the frame is buffered to be sent after DTIM beacon frame.
357 * This is done either by the hardware or us.
360 /* powersaving STAs only in AP/VLAN mode */
364 /* no buffering for ordered frames */
365 if (ieee80211_has_order(hdr
->frame_control
))
368 /* no stations in PS mode */
369 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
372 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
374 /* device releases frame after DTIM beacon */
375 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
378 /* buffered in mac80211 */
379 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
380 purge_old_ps_buffers(tx
->local
);
382 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
383 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
385 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
388 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
390 tx
->local
->total_ps_buffered
++;
392 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
397 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
400 if (!ieee80211_is_mgmt(fc
))
403 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
406 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
413 static ieee80211_tx_result
414 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
416 struct sta_info
*sta
= tx
->sta
;
417 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
418 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
419 struct ieee80211_local
*local
= tx
->local
;
423 ieee80211_is_probe_resp(hdr
->frame_control
) ||
424 ieee80211_is_auth(hdr
->frame_control
) ||
425 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
426 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
429 staflags
= get_sta_flags(sta
);
431 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
432 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
433 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
434 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
436 sta
->sta
.addr
, sta
->sta
.aid
,
437 skb_queue_len(&sta
->ps_tx_buf
));
438 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
439 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
440 purge_old_ps_buffers(tx
->local
);
441 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
442 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
443 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
444 if (net_ratelimit()) {
445 printk(KERN_DEBUG
"%s: STA %pM TX "
446 "buffer full - dropping oldest frame\n",
447 tx
->sdata
->name
, sta
->sta
.addr
);
452 tx
->local
->total_ps_buffered
++;
455 * Queue frame to be sent after STA wakes up/polls,
456 * but don't set the TIM bit if the driver is blocking
457 * wakeup or poll response transmissions anyway.
459 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
460 !(staflags
& WLAN_STA_PS_DRIVER
))
461 sta_info_set_tim_bit(sta
);
463 info
->control
.jiffies
= jiffies
;
464 info
->control
.vif
= &tx
->sdata
->vif
;
465 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
466 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
468 if (!timer_pending(&local
->sta_cleanup
))
469 mod_timer(&local
->sta_cleanup
,
470 round_jiffies(jiffies
+
471 STA_INFO_CLEANUP_INTERVAL
));
475 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
476 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
477 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
478 "set -> send frame\n", tx
->sdata
->name
,
481 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
486 static ieee80211_tx_result debug_noinline
487 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
489 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
492 if (tx
->flags
& IEEE80211_TX_UNICAST
)
493 return ieee80211_tx_h_unicast_ps_buf(tx
);
495 return ieee80211_tx_h_multicast_ps_buf(tx
);
498 static ieee80211_tx_result debug_noinline
499 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
501 struct ieee80211_key
*key
= NULL
;
502 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
503 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
505 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
507 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
509 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
510 is_multicast_ether_addr(hdr
->addr1
) &&
511 ieee80211_is_robust_mgmt_frame(hdr
) &&
512 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
514 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
516 else if (tx
->sdata
->drop_unencrypted
&&
517 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
518 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
519 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
520 (ieee80211_is_action(hdr
->frame_control
) &&
521 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
522 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
528 bool skip_hw
= false;
530 tx
->key
->tx_rx_count
++;
531 /* TODO: add threshold stuff again */
533 switch (tx
->key
->conf
.alg
) {
535 if (ieee80211_is_auth(hdr
->frame_control
))
538 if (!ieee80211_is_data_present(hdr
->frame_control
))
542 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
543 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
547 skip_hw
= (tx
->key
->conf
.flags
&
548 IEEE80211_KEY_FLAG_SW_MGMT
) &&
549 ieee80211_is_mgmt(hdr
->frame_control
);
552 if (!ieee80211_is_mgmt(hdr
->frame_control
))
557 if (!skip_hw
&& tx
->key
&&
558 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
559 info
->control
.hw_key
= &tx
->key
->conf
;
565 static ieee80211_tx_result debug_noinline
566 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
568 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
569 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
570 struct ieee80211_supported_band
*sband
;
571 struct ieee80211_rate
*rate
;
574 bool inval
= false, rts
= false, short_preamble
= false;
575 struct ieee80211_tx_rate_control txrc
;
578 memset(&txrc
, 0, sizeof(txrc
));
580 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
582 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
583 tx
->local
->hw
.wiphy
->frag_threshold
);
585 /* set up the tx rate control struct we give the RC algo */
586 txrc
.hw
= local_to_hw(tx
->local
);
588 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
590 txrc
.reported_rate
.idx
= -1;
591 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
592 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
593 txrc
.max_rate_idx
= -1;
595 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
596 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
598 /* set up RTS protection if desired */
599 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
600 txrc
.rts
= rts
= true;
604 * Use short preamble if the BSS can handle it, but not for
605 * management frames unless we know the receiver can handle
606 * that -- the management frame might be to a station that
607 * just wants a probe response.
609 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
610 (ieee80211_is_data(hdr
->frame_control
) ||
611 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
612 txrc
.short_preamble
= short_preamble
= true;
614 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
617 * Lets not bother rate control if we're associated and cannot
618 * talk to the sta. This should not happen.
620 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
621 (sta_flags
& WLAN_STA_ASSOC
) &&
622 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
623 "%s: Dropped data frame as no usable bitrate found while "
624 "scanning and associated. Target station: "
625 "%pM on %d GHz band\n",
626 tx
->sdata
->name
, hdr
->addr1
,
627 tx
->channel
->band
? 5 : 2))
631 * If we're associated with the sta at this point we know we can at
632 * least send the frame at the lowest bit rate.
634 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
636 if (unlikely(info
->control
.rates
[0].idx
< 0))
639 if (txrc
.reported_rate
.idx
< 0)
640 txrc
.reported_rate
= info
->control
.rates
[0];
643 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
645 if (unlikely(!info
->control
.rates
[0].count
))
646 info
->control
.rates
[0].count
= 1;
648 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
649 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
650 info
->control
.rates
[0].count
= 1;
652 if (is_multicast_ether_addr(hdr
->addr1
)) {
656 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
659 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
661 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
662 /* must be a basic rate */
663 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
665 /* must not be faster than the data rate */
666 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
669 if (sband
->bitrates
[baserate
].bitrate
<
670 sband
->bitrates
[i
].bitrate
)
674 info
->control
.rts_cts_rate_idx
= baserate
;
677 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
679 * make sure there's no valid rate following
680 * an invalid one, just in case drivers don't
681 * take the API seriously to stop at -1.
684 info
->control
.rates
[i
].idx
= -1;
687 if (info
->control
.rates
[i
].idx
< 0) {
693 * For now assume MCS is already set up correctly, this
696 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
697 WARN_ON(info
->control
.rates
[i
].idx
> 76);
701 /* set up RTS protection if desired */
703 info
->control
.rates
[i
].flags
|=
704 IEEE80211_TX_RC_USE_RTS_CTS
;
707 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
708 sband
->n_bitrates
)) {
709 info
->control
.rates
[i
].idx
= -1;
713 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
715 /* set up short preamble */
716 if (short_preamble
&&
717 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
718 info
->control
.rates
[i
].flags
|=
719 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
721 /* set up G protection */
722 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
723 rate
->flags
& IEEE80211_RATE_ERP_G
)
724 info
->control
.rates
[i
].flags
|=
725 IEEE80211_TX_RC_USE_CTS_PROTECT
;
731 static ieee80211_tx_result debug_noinline
732 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
734 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
735 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
741 * Packet injection may want to control the sequence
742 * number, if we have no matching interface then we
743 * neither assign one ourselves nor ask the driver to.
745 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
748 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
751 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
755 * Anything but QoS data that has a sequence number field
756 * (is long enough) gets a sequence number from the global
759 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
760 /* driver should assign sequence number */
761 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
762 /* for pure STA mode without beacons, we can do it */
763 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
764 tx
->sdata
->sequence_number
+= 0x10;
769 * This should be true for injected/management frames only, for
770 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
771 * above since they are not QoS-data frames.
776 /* include per-STA, per-TID sequence counter */
778 qc
= ieee80211_get_qos_ctl(hdr
);
779 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
780 seq
= &tx
->sta
->tid_seq
[tid
];
782 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
784 /* Increase the sequence number. */
785 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
790 static int ieee80211_fragment(struct ieee80211_local
*local
,
791 struct sk_buff
*skb
, int hdrlen
,
794 struct sk_buff
*tail
= skb
, *tmp
;
795 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
796 int pos
= hdrlen
+ per_fragm
;
797 int rem
= skb
->len
- hdrlen
- per_fragm
;
799 if (WARN_ON(rem
< 0))
803 int fraglen
= per_fragm
;
808 tmp
= dev_alloc_skb(local
->tx_headroom
+
810 IEEE80211_ENCRYPT_HEADROOM
+
811 IEEE80211_ENCRYPT_TAILROOM
);
816 skb_reserve(tmp
, local
->tx_headroom
+
817 IEEE80211_ENCRYPT_HEADROOM
);
818 /* copy control information */
819 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
820 skb_copy_queue_mapping(tmp
, skb
);
821 tmp
->priority
= skb
->priority
;
824 /* copy header and data */
825 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
826 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
831 skb
->len
= hdrlen
+ per_fragm
;
835 static ieee80211_tx_result debug_noinline
836 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
838 struct sk_buff
*skb
= tx
->skb
;
839 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
840 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
841 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
845 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
849 * Warn when submitting a fragmented A-MPDU frame and drop it.
850 * This scenario is handled in ieee80211_tx_prepare but extra
851 * caution taken here as fragmented ampdu may cause Tx stop.
853 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
856 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
858 /* internal error, why is TX_FRAGMENTED set? */
859 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
863 * Now fragment the frame. This will allocate all the fragments and
864 * chain them (using skb as the first fragment) to skb->next.
865 * During transmission, we will remove the successfully transmitted
866 * fragments from this list. When the low-level driver rejects one
867 * of the fragments then we will simply pretend to accept the skb
868 * but store it away as pending.
870 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
873 /* update duration/seq/flags of fragments */
877 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
879 hdr
= (void *)skb
->data
;
880 info
= IEEE80211_SKB_CB(skb
);
883 hdr
->frame_control
|= morefrags
;
884 next_len
= skb
->next
->len
;
886 * No multi-rate retries for fragmented frames, that
887 * would completely throw off the NAV at other STAs.
889 info
->control
.rates
[1].idx
= -1;
890 info
->control
.rates
[2].idx
= -1;
891 info
->control
.rates
[3].idx
= -1;
892 info
->control
.rates
[4].idx
= -1;
893 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
894 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
896 hdr
->frame_control
&= ~morefrags
;
899 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
900 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
902 } while ((skb
= skb
->next
));
907 static ieee80211_tx_result debug_noinline
908 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
910 struct sk_buff
*skb
= tx
->skb
;
915 tx
->sta
->tx_packets
++;
917 tx
->sta
->tx_fragments
++;
918 tx
->sta
->tx_bytes
+= skb
->len
;
919 } while ((skb
= skb
->next
));
924 static ieee80211_tx_result debug_noinline
925 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
930 switch (tx
->key
->conf
.alg
) {
932 return ieee80211_crypto_wep_encrypt(tx
);
934 return ieee80211_crypto_tkip_encrypt(tx
);
936 return ieee80211_crypto_ccmp_encrypt(tx
);
938 return ieee80211_crypto_aes_cmac_encrypt(tx
);
946 static ieee80211_tx_result debug_noinline
947 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
949 struct sk_buff
*skb
= tx
->skb
;
950 struct ieee80211_hdr
*hdr
;
955 hdr
= (void *) skb
->data
;
956 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
957 break; /* must not overwrite AID */
958 next_len
= skb
->next
? skb
->next
->len
: 0;
959 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
962 ieee80211_duration(tx
, group_addr
, next_len
);
963 } while ((skb
= skb
->next
));
968 /* actual transmit path */
971 * deal with packet injection down monitor interface
972 * with Radiotap Header -- only called for monitor mode interface
974 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
978 * this is the moment to interpret and discard the radiotap header that
979 * must be at the start of the packet injected in Monitor mode
981 * Need to take some care with endian-ness since radiotap
982 * args are little-endian
985 struct ieee80211_radiotap_iterator iterator
;
986 struct ieee80211_radiotap_header
*rthdr
=
987 (struct ieee80211_radiotap_header
*) skb
->data
;
988 struct ieee80211_supported_band
*sband
;
989 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
990 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
993 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
995 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
996 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
999 * for every radiotap entry that is present
1000 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1001 * entries present, or -EINVAL on error)
1005 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1010 /* see if this argument is something we can use */
1011 switch (iterator
.this_arg_index
) {
1013 * You must take care when dereferencing iterator.this_arg
1014 * for multibyte types... the pointer is not aligned. Use
1015 * get_unaligned((type *)iterator.this_arg) to dereference
1016 * iterator.this_arg for type "type" safely on all arches.
1018 case IEEE80211_RADIOTAP_FLAGS
:
1019 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1021 * this indicates that the skb we have been
1022 * handed has the 32-bit FCS CRC at the end...
1023 * we should react to that by snipping it off
1024 * because it will be recomputed and added
1027 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1030 skb_trim(skb
, skb
->len
- FCS_LEN
);
1032 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1033 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1034 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1035 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1039 * Please update the file
1040 * Documentation/networking/mac80211-injection.txt
1041 * when parsing new fields here.
1049 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1053 * remove the radiotap header
1054 * iterator->_max_length was sanity-checked against
1055 * skb->len by iterator init
1057 skb_pull(skb
, iterator
._max_length
);
1062 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1063 struct sk_buff
*skb
,
1064 struct ieee80211_tx_info
*info
,
1065 struct tid_ampdu_tx
*tid_tx
,
1068 bool queued
= false;
1070 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1071 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1072 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1074 * nothing -- this aggregation session is being started
1075 * but that might still fail with the driver
1078 spin_lock(&tx
->sta
->lock
);
1080 * Need to re-check now, because we may get here
1082 * 1) in the window during which the setup is actually
1083 * already done, but not marked yet because not all
1084 * packets are spliced over to the driver pending
1085 * queue yet -- if this happened we acquire the lock
1086 * either before or after the splice happens, but
1087 * need to recheck which of these cases happened.
1089 * 2) during session teardown, if the OPERATIONAL bit
1090 * was cleared due to the teardown but the pointer
1091 * hasn't been assigned NULL yet (or we loaded it
1092 * before it was assigned) -- in this case it may
1093 * now be NULL which means we should just let the
1094 * packet pass through because splicing the frames
1095 * back is already done.
1097 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1100 /* do nothing, let packet pass through */
1101 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1102 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1105 info
->control
.vif
= &tx
->sdata
->vif
;
1106 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1107 __skb_queue_tail(&tid_tx
->pending
, skb
);
1109 spin_unlock(&tx
->sta
->lock
);
1118 static ieee80211_tx_result
1119 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1120 struct ieee80211_tx_data
*tx
,
1121 struct sk_buff
*skb
)
1123 struct ieee80211_local
*local
= sdata
->local
;
1124 struct ieee80211_hdr
*hdr
;
1125 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1129 memset(tx
, 0, sizeof(*tx
));
1133 tx
->channel
= local
->hw
.conf
.channel
;
1135 * Set this flag (used below to indicate "automatic fragmentation"),
1136 * it will be cleared/left by radiotap as desired.
1138 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1140 /* process and remove the injection radiotap header */
1141 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1142 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1146 * __ieee80211_parse_tx_radiotap has now removed
1147 * the radiotap header that was present and pre-filled
1148 * 'tx' with tx control information.
1150 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1154 * If this flag is set to true anywhere, and we get here,
1155 * we are doing the needed processing, so remove the flag
1158 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1160 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1162 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1163 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1164 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1166 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1167 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1170 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1172 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1173 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1174 struct tid_ampdu_tx
*tid_tx
;
1176 qc
= ieee80211_get_qos_ctl(hdr
);
1177 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1179 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1183 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1186 if (unlikely(queued
))
1191 if (is_multicast_ether_addr(hdr
->addr1
)) {
1192 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1193 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1195 tx
->flags
|= IEEE80211_TX_UNICAST
;
1196 if (unlikely(local
->wifi_wme_noack_test
))
1197 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1199 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1202 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1203 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1204 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1205 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1206 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1208 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1212 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1213 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1214 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1216 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1217 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1218 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1219 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1221 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1226 static int __ieee80211_tx(struct ieee80211_local
*local
,
1227 struct sk_buff
**skbp
,
1228 struct sta_info
*sta
,
1231 struct sk_buff
*skb
= *skbp
, *next
;
1232 struct ieee80211_tx_info
*info
;
1233 struct ieee80211_sub_if_data
*sdata
;
1234 unsigned long flags
;
1239 int q
= skb_get_queue_mapping(skb
);
1241 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1242 ret
= IEEE80211_TX_OK
;
1243 if (local
->queue_stop_reasons
[q
] ||
1244 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1245 ret
= IEEE80211_TX_PENDING
;
1246 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1247 if (ret
!= IEEE80211_TX_OK
)
1250 info
= IEEE80211_SKB_CB(skb
);
1253 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1254 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1260 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1262 sdata
= vif_to_sdata(info
->control
.vif
);
1264 switch (sdata
->vif
.type
) {
1265 case NL80211_IFTYPE_MONITOR
:
1266 info
->control
.vif
= NULL
;
1268 case NL80211_IFTYPE_AP_VLAN
:
1269 info
->control
.vif
= &container_of(sdata
->bss
,
1270 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1277 if (sta
&& sta
->uploaded
)
1278 info
->control
.sta
= &sta
->sta
;
1280 info
->control
.sta
= NULL
;
1282 ret
= drv_tx(local
, skb
);
1283 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1287 if (ret
!= NETDEV_TX_OK
) {
1288 info
->control
.vif
= &sdata
->vif
;
1289 return IEEE80211_TX_AGAIN
;
1293 ieee80211_led_tx(local
, 1);
1297 return IEEE80211_TX_OK
;
1301 * Invoke TX handlers, return 0 on success and non-zero if the
1302 * frame was dropped or queued.
1304 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1306 struct sk_buff
*skb
= tx
->skb
;
1307 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1308 ieee80211_tx_result res
= TX_DROP
;
1310 #define CALL_TXH(txh) \
1313 if (res != TX_CONTINUE) \
1317 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1318 CALL_TXH(ieee80211_tx_h_check_assoc
);
1319 CALL_TXH(ieee80211_tx_h_ps_buf
);
1320 CALL_TXH(ieee80211_tx_h_select_key
);
1321 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1322 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1324 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1327 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1328 CALL_TXH(ieee80211_tx_h_sequence
);
1329 CALL_TXH(ieee80211_tx_h_fragment
);
1330 /* handlers after fragment must be aware of tx info fragmentation! */
1331 CALL_TXH(ieee80211_tx_h_stats
);
1332 CALL_TXH(ieee80211_tx_h_encrypt
);
1333 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1337 if (unlikely(res
== TX_DROP
)) {
1338 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1340 struct sk_buff
*next
;
1347 } else if (unlikely(res
== TX_QUEUED
)) {
1348 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1355 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1356 struct sk_buff
*skb
, bool txpending
)
1358 struct ieee80211_local
*local
= sdata
->local
;
1359 struct ieee80211_tx_data tx
;
1360 ieee80211_tx_result res_prepare
;
1361 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1362 struct sk_buff
*next
;
1363 unsigned long flags
;
1367 queue
= skb_get_queue_mapping(skb
);
1369 if (unlikely(skb
->len
< 10)) {
1376 /* initialises tx */
1377 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1379 if (unlikely(res_prepare
== TX_DROP
)) {
1383 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1388 tx
.channel
= local
->hw
.conf
.channel
;
1389 info
->band
= tx
.channel
->band
;
1391 if (invoke_tx_handlers(&tx
))
1396 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1398 case IEEE80211_TX_OK
:
1400 case IEEE80211_TX_AGAIN
:
1402 * Since there are no fragmented frames on A-MPDU
1403 * queues, there's no reason for a driver to reject
1404 * a frame there, warn and drop it.
1406 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1409 case IEEE80211_TX_PENDING
:
1412 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1414 if (local
->queue_stop_reasons
[queue
] ||
1415 !skb_queue_empty(&local
->pending
[queue
])) {
1417 * if queue is stopped, queue up frames for later
1418 * transmission from the tasklet
1423 if (unlikely(txpending
))
1424 __skb_queue_head(&local
->pending
[queue
],
1427 __skb_queue_tail(&local
->pending
[queue
],
1429 } while ((skb
= next
));
1431 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1435 * otherwise retry, but this is a race condition or
1436 * a driver bug (which we warn about if it persists)
1438 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1442 if (WARN(retries
> 10, "tx refused but queue active\n"))
1462 /* device xmit handlers */
1464 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1465 struct sk_buff
*skb
,
1466 int head_need
, bool may_encrypt
)
1471 * This could be optimised, devices that do full hardware
1472 * crypto (including TKIP MMIC) need no tailroom... But we
1473 * have no drivers for such devices currently.
1476 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1477 tail_need
-= skb_tailroom(skb
);
1478 tail_need
= max_t(int, tail_need
, 0);
1481 if (head_need
|| tail_need
) {
1482 /* Sorry. Can't account for this any more */
1486 if (skb_header_cloned(skb
))
1487 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1489 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1491 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1492 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1493 wiphy_name(local
->hw
.wiphy
));
1497 /* update truesize too */
1498 skb
->truesize
+= head_need
+ tail_need
;
1503 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1504 struct sk_buff
*skb
)
1506 struct ieee80211_local
*local
= sdata
->local
;
1507 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1508 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1509 struct ieee80211_sub_if_data
*tmp_sdata
;
1515 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1519 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1520 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1522 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1523 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1524 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1526 /* check the header is complete in the frame */
1527 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1529 * We process outgoing injected frames that have a
1530 * local address we handle as though they are our
1532 * This code here isn't entirely correct, the local
1533 * MAC address is not necessarily enough to find
1534 * the interface to use; for that proper VLAN/WDS
1535 * support we will need a different mechanism.
1538 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1540 if (!ieee80211_sdata_running(tmp_sdata
))
1542 if (tmp_sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1544 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1553 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1555 headroom
= local
->tx_headroom
;
1557 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1558 headroom
-= skb_headroom(skb
);
1559 headroom
= max_t(int, 0, headroom
);
1561 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1567 info
->control
.vif
= &sdata
->vif
;
1569 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1570 ieee80211_is_data(hdr
->frame_control
) &&
1571 !is_multicast_ether_addr(hdr
->addr1
))
1572 if (mesh_nexthop_lookup(skb
, sdata
)) {
1573 /* skb queued: don't free */
1578 ieee80211_set_qos_hdr(local
, skb
);
1579 ieee80211_tx(sdata
, skb
, false);
1583 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1584 struct net_device
*dev
)
1586 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1587 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1588 struct ieee80211_radiotap_header
*prthdr
=
1589 (struct ieee80211_radiotap_header
*)skb
->data
;
1590 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1594 * Frame injection is not allowed if beaconing is not allowed
1595 * or if we need radar detection. Beaconing is usually not allowed when
1596 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1597 * Passive scan is also used in world regulatory domains where
1598 * your country is not known and as such it should be treated as
1599 * NO TX unless the channel is explicitly allowed in which case
1600 * your current regulatory domain would not have the passive scan
1603 * Since AP mode uses monitor interfaces to inject/TX management
1604 * frames we can make AP mode the exception to this rule once it
1605 * supports radar detection as its implementation can deal with
1606 * radar detection by itself. We can do that later by adding a
1607 * monitor flag interfaces used for AP support.
1609 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1610 IEEE80211_CHAN_PASSIVE_SCAN
)))
1613 /* check for not even having the fixed radiotap header part */
1614 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1615 goto fail
; /* too short to be possibly valid */
1617 /* is it a header version we can trust to find length from? */
1618 if (unlikely(prthdr
->it_version
))
1619 goto fail
; /* only version 0 is supported */
1621 /* then there must be a radiotap header with a length we can use */
1622 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1624 /* does the skb contain enough to deliver on the alleged length? */
1625 if (unlikely(skb
->len
< len_rthdr
))
1626 goto fail
; /* skb too short for claimed rt header extent */
1629 * fix up the pointers accounting for the radiotap
1630 * header still being in there. We are being given
1631 * a precooked IEEE80211 header so no need for
1634 skb_set_mac_header(skb
, len_rthdr
);
1636 * these are just fixed to the end of the rt area since we
1637 * don't have any better information and at this point, nobody cares
1639 skb_set_network_header(skb
, len_rthdr
);
1640 skb_set_transport_header(skb
, len_rthdr
);
1642 memset(info
, 0, sizeof(*info
));
1644 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1646 /* pass the radiotap header up to xmit */
1647 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1648 return NETDEV_TX_OK
;
1652 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1656 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1657 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1658 * @skb: packet to be sent
1659 * @dev: incoming interface
1661 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1662 * not be freed, and caller is responsible for either retrying later or freeing
1665 * This function takes in an Ethernet header and encapsulates it with suitable
1666 * IEEE 802.11 header based on which interface the packet is coming in. The
1667 * encapsulated packet will then be passed to master interface, wlan#.11, for
1668 * transmission (through low-level driver).
1670 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1671 struct net_device
*dev
)
1673 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1674 struct ieee80211_local
*local
= sdata
->local
;
1675 struct ieee80211_tx_info
*info
;
1676 int ret
= NETDEV_TX_BUSY
, head_need
;
1677 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1679 struct ieee80211_hdr hdr
;
1680 struct ieee80211s_hdr mesh_hdr
;
1681 const u8
*encaps_data
;
1682 int encaps_len
, skip_header_bytes
;
1684 struct sta_info
*sta
= NULL
;
1686 struct sk_buff
*tmp_skb
;
1688 if (unlikely(skb
->len
< ETH_HLEN
)) {
1693 /* convert Ethernet header to proper 802.11 header (based on
1694 * operation mode) */
1695 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1696 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1698 switch (sdata
->vif
.type
) {
1699 case NL80211_IFTYPE_AP_VLAN
:
1701 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1703 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1705 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1706 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1707 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1708 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1710 sta_flags
= get_sta_flags(sta
);
1716 case NL80211_IFTYPE_AP
:
1717 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1719 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1720 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1721 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1724 case NL80211_IFTYPE_WDS
:
1725 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1727 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_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
);
1733 #ifdef CONFIG_MAC80211_MESH
1734 case NL80211_IFTYPE_MESH_POINT
:
1735 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1736 /* Do not send frames with mesh_ttl == 0 */
1737 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1742 if (compare_ether_addr(sdata
->vif
.addr
,
1743 skb
->data
+ ETH_ALEN
) == 0) {
1744 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1745 skb
->data
, skb
->data
+ ETH_ALEN
);
1746 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1747 sdata
, NULL
, NULL
, NULL
);
1749 /* packet from other interface */
1750 struct mesh_path
*mppath
;
1751 int is_mesh_mcast
= 1;
1755 if (is_multicast_ether_addr(skb
->data
))
1756 /* DA TA mSA AE:SA */
1757 mesh_da
= skb
->data
;
1759 static const u8 bcast
[ETH_ALEN
] =
1760 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1762 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1764 /* RA TA mDA mSA AE:DA SA */
1765 mesh_da
= mppath
->mpp
;
1768 /* DA TA mSA AE:SA */
1772 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1773 mesh_da
, sdata
->vif
.addr
);
1777 ieee80211_new_mesh_header(&mesh_hdr
,
1779 skb
->data
+ ETH_ALEN
,
1784 ieee80211_new_mesh_header(&mesh_hdr
,
1788 skb
->data
+ ETH_ALEN
);
1793 case NL80211_IFTYPE_STATION
:
1794 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1795 if (sdata
->u
.mgd
.use_4addr
&& ethertype
!= ETH_P_PAE
) {
1796 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1798 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1799 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1800 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1803 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1805 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1806 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1810 case NL80211_IFTYPE_ADHOC
:
1812 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1813 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1814 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1823 * There's no need to try to look up the destination
1824 * if it is a multicast address (which can only happen
1827 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1829 sta
= sta_info_get(sdata
, hdr
.addr1
);
1831 sta_flags
= get_sta_flags(sta
);
1835 /* receiver and we are QoS enabled, use a QoS type frame */
1836 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1837 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1842 * Drop unicast frames to unauthorised stations unless they are
1843 * EAPOL frames from the local station.
1845 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1846 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1847 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1848 !(ethertype
== ETH_P_PAE
&&
1849 compare_ether_addr(sdata
->vif
.addr
,
1850 skb
->data
+ ETH_ALEN
) == 0))) {
1851 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1852 if (net_ratelimit())
1853 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1854 " (unauthorized port)\n", dev
->name
,
1858 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1865 * If the skb is shared we need to obtain our own copy.
1867 if (skb_shared(skb
)) {
1869 skb
= skb_copy(skb
, GFP_ATOMIC
);
1878 hdr
.frame_control
= fc
;
1879 hdr
.duration_id
= 0;
1882 skip_header_bytes
= ETH_HLEN
;
1883 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1884 encaps_data
= bridge_tunnel_header
;
1885 encaps_len
= sizeof(bridge_tunnel_header
);
1886 skip_header_bytes
-= 2;
1887 } else if (ethertype
>= 0x600) {
1888 encaps_data
= rfc1042_header
;
1889 encaps_len
= sizeof(rfc1042_header
);
1890 skip_header_bytes
-= 2;
1896 nh_pos
= skb_network_header(skb
) - skb
->data
;
1897 h_pos
= skb_transport_header(skb
) - skb
->data
;
1899 skb_pull(skb
, skip_header_bytes
);
1900 nh_pos
-= skip_header_bytes
;
1901 h_pos
-= skip_header_bytes
;
1903 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1906 * So we need to modify the skb header and hence need a copy of
1907 * that. The head_need variable above doesn't, so far, include
1908 * the needed header space that we don't need right away. If we
1909 * can, then we don't reallocate right now but only after the
1910 * frame arrives at the master device (if it does...)
1912 * If we cannot, however, then we will reallocate to include all
1913 * the ever needed space. Also, if we need to reallocate it anyway,
1914 * make it big enough for everything we may ever need.
1917 if (head_need
> 0 || skb_cloned(skb
)) {
1918 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1919 head_need
+= local
->tx_headroom
;
1920 head_need
= max_t(int, 0, head_need
);
1921 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1926 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1927 nh_pos
+= encaps_len
;
1928 h_pos
+= encaps_len
;
1931 #ifdef CONFIG_MAC80211_MESH
1932 if (meshhdrlen
> 0) {
1933 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1934 nh_pos
+= meshhdrlen
;
1935 h_pos
+= meshhdrlen
;
1939 if (ieee80211_is_data_qos(fc
)) {
1940 __le16
*qos_control
;
1942 qos_control
= (__le16
*) skb_push(skb
, 2);
1943 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1945 * Maybe we could actually set some fields here, for now just
1946 * initialise to zero to indicate no special operation.
1950 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1955 dev
->stats
.tx_packets
++;
1956 dev
->stats
.tx_bytes
+= skb
->len
;
1958 /* Update skb pointers to various headers since this modified frame
1959 * is going to go through Linux networking code that may potentially
1960 * need things like pointer to IP header. */
1961 skb_set_mac_header(skb
, 0);
1962 skb_set_network_header(skb
, nh_pos
);
1963 skb_set_transport_header(skb
, h_pos
);
1965 info
= IEEE80211_SKB_CB(skb
);
1966 memset(info
, 0, sizeof(*info
));
1968 dev
->trans_start
= jiffies
;
1969 ieee80211_xmit(sdata
, skb
);
1971 return NETDEV_TX_OK
;
1974 if (ret
== NETDEV_TX_OK
)
1982 * ieee80211_clear_tx_pending may not be called in a context where
1983 * it is possible that it packets could come in again.
1985 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1989 for (i
= 0; i
< local
->hw
.queues
; i
++)
1990 skb_queue_purge(&local
->pending
[i
]);
1993 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
1994 struct sk_buff
*skb
)
1996 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1997 struct ieee80211_sub_if_data
*sdata
;
1998 struct sta_info
*sta
;
1999 struct ieee80211_hdr
*hdr
;
2003 sdata
= vif_to_sdata(info
->control
.vif
);
2005 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2006 ieee80211_tx(sdata
, skb
, true);
2008 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2009 sta
= sta_info_get(sdata
, hdr
->addr1
);
2011 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
2012 if (ret
!= IEEE80211_TX_OK
)
2020 * Transmit all pending packets. Called from tasklet.
2022 void ieee80211_tx_pending(unsigned long data
)
2024 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2025 struct ieee80211_sub_if_data
*sdata
;
2026 unsigned long flags
;
2032 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2033 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2035 * If queue is stopped by something other than due to pending
2036 * frames, or we have no pending frames, proceed to next queue.
2038 if (local
->queue_stop_reasons
[i
] ||
2039 skb_queue_empty(&local
->pending
[i
]))
2042 while (!skb_queue_empty(&local
->pending
[i
])) {
2043 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2044 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2046 if (WARN_ON(!info
->control
.vif
)) {
2051 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2054 txok
= ieee80211_tx_pending_skb(local
, skb
);
2056 __skb_queue_head(&local
->pending
[i
], skb
);
2057 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2063 if (skb_queue_empty(&local
->pending
[i
]))
2064 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2065 netif_tx_wake_queue(
2066 netdev_get_tx_queue(sdata
->dev
, i
));
2068 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2073 /* functions for drivers to get certain frames */
2075 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2076 struct sk_buff
*skb
,
2077 struct beacon_data
*beacon
)
2081 int i
, have_bits
= 0, n1
, n2
;
2083 /* Generate bitmap for TIM only if there are any STAs in power save
2085 if (atomic_read(&bss
->num_sta_ps
) > 0)
2086 /* in the hope that this is faster than
2087 * checking byte-for-byte */
2088 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2089 IEEE80211_MAX_AID
+1);
2091 if (bss
->dtim_count
== 0)
2092 bss
->dtim_count
= beacon
->dtim_period
- 1;
2096 tim
= pos
= (u8
*) skb_put(skb
, 6);
2097 *pos
++ = WLAN_EID_TIM
;
2099 *pos
++ = bss
->dtim_count
;
2100 *pos
++ = beacon
->dtim_period
;
2102 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2106 /* Find largest even number N1 so that bits numbered 1 through
2107 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2108 * (N2 + 1) x 8 through 2007 are 0. */
2110 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2117 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2124 /* Bitmap control */
2126 /* Part Virt Bitmap */
2127 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2129 tim
[1] = n2
- n1
+ 4;
2130 skb_put(skb
, n2
- n1
);
2132 *pos
++ = aid0
; /* Bitmap control */
2133 *pos
++ = 0; /* Part Virt Bitmap */
2137 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2138 struct ieee80211_vif
*vif
,
2139 u16
*tim_offset
, u16
*tim_length
)
2141 struct ieee80211_local
*local
= hw_to_local(hw
);
2142 struct sk_buff
*skb
= NULL
;
2143 struct ieee80211_tx_info
*info
;
2144 struct ieee80211_sub_if_data
*sdata
= NULL
;
2145 struct ieee80211_if_ap
*ap
= NULL
;
2146 struct beacon_data
*beacon
;
2147 struct ieee80211_supported_band
*sband
;
2148 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2149 struct ieee80211_tx_rate_control txrc
;
2151 sband
= local
->hw
.wiphy
->bands
[band
];
2155 sdata
= vif_to_sdata(vif
);
2157 if (!ieee80211_sdata_running(sdata
))
2165 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2167 beacon
= rcu_dereference(ap
->beacon
);
2170 * headroom, head length,
2171 * tail length and maximum TIM length
2173 skb
= dev_alloc_skb(local
->tx_headroom
+
2175 beacon
->tail_len
+ 256);
2179 skb_reserve(skb
, local
->tx_headroom
);
2180 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2184 * Not very nice, but we want to allow the driver to call
2185 * ieee80211_beacon_get() as a response to the set_tim()
2186 * callback. That, however, is already invoked under the
2187 * sta_lock to guarantee consistent and race-free update
2188 * of the tim bitmap in mac80211 and the driver.
2190 if (local
->tim_in_locked_section
) {
2191 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2193 unsigned long flags
;
2195 spin_lock_irqsave(&local
->sta_lock
, flags
);
2196 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2197 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2201 *tim_offset
= beacon
->head_len
;
2203 *tim_length
= skb
->len
- beacon
->head_len
;
2206 memcpy(skb_put(skb
, beacon
->tail_len
),
2207 beacon
->tail
, beacon
->tail_len
);
2210 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2211 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2212 struct ieee80211_hdr
*hdr
;
2213 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2218 skb
= skb_copy(presp
, GFP_ATOMIC
);
2222 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2223 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2224 IEEE80211_STYPE_BEACON
);
2225 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2226 struct ieee80211_mgmt
*mgmt
;
2229 /* headroom, head length, tail length and maximum TIM length */
2230 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2234 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2235 mgmt
= (struct ieee80211_mgmt
*)
2236 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2237 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2238 mgmt
->frame_control
=
2239 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2240 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2241 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2242 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2243 mgmt
->u
.beacon
.beacon_int
=
2244 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2245 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2247 pos
= skb_put(skb
, 2);
2248 *pos
++ = WLAN_EID_SSID
;
2251 mesh_mgmt_ies_add(skb
, sdata
);
2257 info
= IEEE80211_SKB_CB(skb
);
2259 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2260 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2263 memset(&txrc
, 0, sizeof(txrc
));
2266 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2268 txrc
.reported_rate
.idx
= -1;
2269 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2270 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2271 txrc
.max_rate_idx
= -1;
2273 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2275 rate_control_get_rate(sdata
, NULL
, &txrc
);
2277 info
->control
.vif
= vif
;
2279 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2280 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2281 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2286 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2288 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2289 struct ieee80211_vif
*vif
)
2291 struct ieee80211_sub_if_data
*sdata
;
2292 struct ieee80211_if_managed
*ifmgd
;
2293 struct ieee80211_pspoll
*pspoll
;
2294 struct ieee80211_local
*local
;
2295 struct sk_buff
*skb
;
2297 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2300 sdata
= vif_to_sdata(vif
);
2301 ifmgd
= &sdata
->u
.mgd
;
2302 local
= sdata
->local
;
2304 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2306 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2307 "pspoll template\n", sdata
->name
);
2310 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2312 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2313 memset(pspoll
, 0, sizeof(*pspoll
));
2314 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2315 IEEE80211_STYPE_PSPOLL
);
2316 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2318 /* aid in PS-Poll has its two MSBs each set to 1 */
2319 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2321 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2322 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2326 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2328 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2329 struct ieee80211_vif
*vif
)
2331 struct ieee80211_hdr_3addr
*nullfunc
;
2332 struct ieee80211_sub_if_data
*sdata
;
2333 struct ieee80211_if_managed
*ifmgd
;
2334 struct ieee80211_local
*local
;
2335 struct sk_buff
*skb
;
2337 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2340 sdata
= vif_to_sdata(vif
);
2341 ifmgd
= &sdata
->u
.mgd
;
2342 local
= sdata
->local
;
2344 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2346 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2347 "template\n", sdata
->name
);
2350 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2352 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2354 memset(nullfunc
, 0, sizeof(*nullfunc
));
2355 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2356 IEEE80211_STYPE_NULLFUNC
|
2357 IEEE80211_FCTL_TODS
);
2358 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2359 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2360 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2364 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2366 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2367 struct ieee80211_vif
*vif
,
2368 const u8
*ssid
, size_t ssid_len
,
2369 const u8
*ie
, size_t ie_len
)
2371 struct ieee80211_sub_if_data
*sdata
;
2372 struct ieee80211_local
*local
;
2373 struct ieee80211_hdr_3addr
*hdr
;
2374 struct sk_buff
*skb
;
2378 sdata
= vif_to_sdata(vif
);
2379 local
= sdata
->local
;
2380 ie_ssid_len
= 2 + ssid_len
;
2382 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2383 ie_ssid_len
+ ie_len
);
2385 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2386 "request template\n", sdata
->name
);
2390 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2392 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2393 memset(hdr
, 0, sizeof(*hdr
));
2394 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2395 IEEE80211_STYPE_PROBE_REQ
);
2396 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2397 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2398 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2400 pos
= skb_put(skb
, ie_ssid_len
);
2401 *pos
++ = WLAN_EID_SSID
;
2404 memcpy(pos
, ssid
, ssid_len
);
2408 pos
= skb_put(skb
, ie_len
);
2409 memcpy(pos
, ie
, ie_len
);
2414 EXPORT_SYMBOL(ieee80211_probereq_get
);
2416 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2417 const void *frame
, size_t frame_len
,
2418 const struct ieee80211_tx_info
*frame_txctl
,
2419 struct ieee80211_rts
*rts
)
2421 const struct ieee80211_hdr
*hdr
= frame
;
2423 rts
->frame_control
=
2424 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2425 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2427 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2428 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2430 EXPORT_SYMBOL(ieee80211_rts_get
);
2432 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2433 const void *frame
, size_t frame_len
,
2434 const struct ieee80211_tx_info
*frame_txctl
,
2435 struct ieee80211_cts
*cts
)
2437 const struct ieee80211_hdr
*hdr
= frame
;
2439 cts
->frame_control
=
2440 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2441 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2442 frame_len
, frame_txctl
);
2443 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2445 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2448 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2449 struct ieee80211_vif
*vif
)
2451 struct ieee80211_local
*local
= hw_to_local(hw
);
2452 struct sk_buff
*skb
= NULL
;
2453 struct sta_info
*sta
;
2454 struct ieee80211_tx_data tx
;
2455 struct ieee80211_sub_if_data
*sdata
;
2456 struct ieee80211_if_ap
*bss
= NULL
;
2457 struct beacon_data
*beacon
;
2458 struct ieee80211_tx_info
*info
;
2460 sdata
= vif_to_sdata(vif
);
2464 beacon
= rcu_dereference(bss
->beacon
);
2466 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2469 if (bss
->dtim_count
!= 0)
2470 goto out
; /* send buffered bc/mc only after DTIM beacon */
2473 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2476 local
->total_ps_buffered
--;
2478 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2479 struct ieee80211_hdr
*hdr
=
2480 (struct ieee80211_hdr
*) skb
->data
;
2481 /* more buffered multicast/broadcast frames ==> set
2482 * MoreData flag in IEEE 802.11 header to inform PS
2484 hdr
->frame_control
|=
2485 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2488 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2490 dev_kfree_skb_any(skb
);
2493 info
= IEEE80211_SKB_CB(skb
);
2496 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2497 tx
.channel
= local
->hw
.conf
.channel
;
2498 info
->band
= tx
.channel
->band
;
2500 if (invoke_tx_handlers(&tx
))
2507 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2509 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2511 skb_set_mac_header(skb
, 0);
2512 skb_set_network_header(skb
, 0);
2513 skb_set_transport_header(skb
, 0);
2515 /* send all internal mgmt frames on VO */
2516 skb_set_queue_mapping(skb
, 0);
2519 * The other path calling ieee80211_xmit is from the tasklet,
2520 * and while we can handle concurrent transmissions locking
2521 * requirements are that we do not come into tx with bhs on.
2524 ieee80211_xmit(sdata
, skb
);