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_WDS
)
279 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
282 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
285 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
287 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
288 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
289 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
290 ieee80211_is_data(hdr
->frame_control
))) {
291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
292 printk(KERN_DEBUG
"%s: dropped data frame to not "
293 "associated station %pM\n",
294 tx
->sdata
->name
, hdr
->addr1
);
295 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
296 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
300 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
301 tx
->local
->num_sta
== 0 &&
302 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
304 * No associated STAs - no need to send multicast
315 /* This function is called whenever the AP is about to exceed the maximum limit
316 * of buffered frames for power saving STAs. This situation should not really
317 * happen often during normal operation, so dropping the oldest buffered packet
318 * from each queue should be OK to make some room for new frames. */
319 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
321 int total
= 0, purged
= 0;
323 struct ieee80211_sub_if_data
*sdata
;
324 struct sta_info
*sta
;
327 * virtual interfaces are protected by RCU
331 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
332 struct ieee80211_if_ap
*ap
;
333 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
336 skb
= skb_dequeue(&ap
->ps_bc_buf
);
341 total
+= skb_queue_len(&ap
->ps_bc_buf
);
344 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
345 skb
= skb_dequeue(&sta
->ps_tx_buf
);
350 total
+= skb_queue_len(&sta
->ps_tx_buf
);
355 local
->total_ps_buffered
= total
;
356 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
357 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
362 static ieee80211_tx_result
363 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
365 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
366 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
369 * broadcast/multicast frame
371 * If any of the associated stations is in power save mode,
372 * the frame is buffered to be sent after DTIM beacon frame.
373 * This is done either by the hardware or us.
376 /* powersaving STAs only in AP/VLAN mode */
380 /* no buffering for ordered frames */
381 if (ieee80211_has_order(hdr
->frame_control
))
384 /* no stations in PS mode */
385 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
388 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
390 /* device releases frame after DTIM beacon */
391 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
394 /* buffered in mac80211 */
395 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
396 purge_old_ps_buffers(tx
->local
);
398 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
404 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
406 tx
->local
->total_ps_buffered
++;
408 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
413 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
416 if (!ieee80211_is_mgmt(fc
))
419 if (sta
== NULL
|| !test_sta_flags(sta
, WLAN_STA_MFP
))
422 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
429 static ieee80211_tx_result
430 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
432 struct sta_info
*sta
= tx
->sta
;
433 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
434 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
435 struct ieee80211_local
*local
= tx
->local
;
439 ieee80211_is_probe_resp(hdr
->frame_control
) ||
440 ieee80211_is_auth(hdr
->frame_control
) ||
441 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
442 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
445 staflags
= get_sta_flags(sta
);
447 if (unlikely((staflags
& (WLAN_STA_PS_STA
| WLAN_STA_PS_DRIVER
)) &&
448 !(info
->flags
& IEEE80211_TX_CTL_PSPOLL_RESPONSE
))) {
449 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
450 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
452 sta
->sta
.addr
, sta
->sta
.aid
,
453 skb_queue_len(&sta
->ps_tx_buf
));
454 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
455 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
456 purge_old_ps_buffers(tx
->local
);
457 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
458 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
459 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
460 if (net_ratelimit()) {
461 printk(KERN_DEBUG
"%s: STA %pM TX "
462 "buffer full - dropping oldest frame\n",
463 tx
->sdata
->name
, sta
->sta
.addr
);
468 tx
->local
->total_ps_buffered
++;
471 * Queue frame to be sent after STA wakes up/polls,
472 * but don't set the TIM bit if the driver is blocking
473 * wakeup or poll response transmissions anyway.
475 if (skb_queue_empty(&sta
->ps_tx_buf
) &&
476 !(staflags
& WLAN_STA_PS_DRIVER
))
477 sta_info_set_tim_bit(sta
);
479 info
->control
.jiffies
= jiffies
;
480 info
->control
.vif
= &tx
->sdata
->vif
;
481 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
482 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
484 if (!timer_pending(&local
->sta_cleanup
))
485 mod_timer(&local
->sta_cleanup
,
486 round_jiffies(jiffies
+
487 STA_INFO_CLEANUP_INTERVAL
));
491 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
492 else if (unlikely(staflags
& WLAN_STA_PS_STA
)) {
493 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
494 "set -> send frame\n", tx
->sdata
->name
,
497 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
502 static ieee80211_tx_result debug_noinline
503 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
505 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
508 if (tx
->flags
& IEEE80211_TX_UNICAST
)
509 return ieee80211_tx_h_unicast_ps_buf(tx
);
511 return ieee80211_tx_h_multicast_ps_buf(tx
);
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
517 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
519 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
520 tx
->sdata
->control_port_no_encrypt
))
521 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
529 struct ieee80211_key
*key
= NULL
;
530 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
531 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
533 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
535 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
537 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
538 is_multicast_ether_addr(hdr
->addr1
) &&
539 ieee80211_is_robust_mgmt_frame(hdr
) &&
540 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
542 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
544 else if (tx
->sdata
->drop_unencrypted
&&
545 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
546 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
547 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
548 (ieee80211_is_action(hdr
->frame_control
) &&
549 tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_MFP
)))) {
550 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
556 bool skip_hw
= false;
558 tx
->key
->tx_rx_count
++;
559 /* TODO: add threshold stuff again */
561 switch (tx
->key
->conf
.cipher
) {
562 case WLAN_CIPHER_SUITE_WEP40
:
563 case WLAN_CIPHER_SUITE_WEP104
:
564 if (ieee80211_is_auth(hdr
->frame_control
))
566 case WLAN_CIPHER_SUITE_TKIP
:
567 if (!ieee80211_is_data_present(hdr
->frame_control
))
570 case WLAN_CIPHER_SUITE_CCMP
:
571 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
572 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
576 skip_hw
= (tx
->key
->conf
.flags
&
577 IEEE80211_KEY_FLAG_SW_MGMT
) &&
578 ieee80211_is_mgmt(hdr
->frame_control
);
580 case WLAN_CIPHER_SUITE_AES_CMAC
:
581 if (!ieee80211_is_mgmt(hdr
->frame_control
))
586 if (!skip_hw
&& tx
->key
&&
587 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
588 info
->control
.hw_key
= &tx
->key
->conf
;
594 static ieee80211_tx_result debug_noinline
595 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
597 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
598 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
599 struct ieee80211_supported_band
*sband
;
600 struct ieee80211_rate
*rate
;
603 bool inval
= false, rts
= false, short_preamble
= false;
604 struct ieee80211_tx_rate_control txrc
;
607 memset(&txrc
, 0, sizeof(txrc
));
609 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
611 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
612 tx
->local
->hw
.wiphy
->frag_threshold
);
614 /* set up the tx rate control struct we give the RC algo */
615 txrc
.hw
= local_to_hw(tx
->local
);
617 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
619 txrc
.reported_rate
.idx
= -1;
620 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
621 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
622 txrc
.max_rate_idx
= -1;
624 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
625 txrc
.ap
= tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
;
627 /* set up RTS protection if desired */
628 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
629 txrc
.rts
= rts
= true;
633 * Use short preamble if the BSS can handle it, but not for
634 * management frames unless we know the receiver can handle
635 * that -- the management frame might be to a station that
636 * just wants a probe response.
638 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
639 (ieee80211_is_data(hdr
->frame_control
) ||
640 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
641 txrc
.short_preamble
= short_preamble
= true;
643 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
646 * Lets not bother rate control if we're associated and cannot
647 * talk to the sta. This should not happen.
649 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) &&
650 (sta_flags
& WLAN_STA_ASSOC
) &&
651 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
652 "%s: Dropped data frame as no usable bitrate found while "
653 "scanning and associated. Target station: "
654 "%pM on %d GHz band\n",
655 tx
->sdata
->name
, hdr
->addr1
,
656 tx
->channel
->band
? 5 : 2))
660 * If we're associated with the sta at this point we know we can at
661 * least send the frame at the lowest bit rate.
663 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
665 if (unlikely(info
->control
.rates
[0].idx
< 0))
668 if (txrc
.reported_rate
.idx
< 0)
669 txrc
.reported_rate
= info
->control
.rates
[0];
672 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
674 if (unlikely(!info
->control
.rates
[0].count
))
675 info
->control
.rates
[0].count
= 1;
677 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
678 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
679 info
->control
.rates
[0].count
= 1;
681 if (is_multicast_ether_addr(hdr
->addr1
)) {
683 * XXX: verify the rate is in the basic rateset
689 * set up the RTS/CTS rate as the fastest basic rate
690 * that is not faster than the data rate
692 * XXX: Should this check all retry rates?
694 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
697 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
699 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
700 /* must be a basic rate */
701 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
703 /* must not be faster than the data rate */
704 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
707 if (sband
->bitrates
[baserate
].bitrate
<
708 sband
->bitrates
[i
].bitrate
)
712 info
->control
.rts_cts_rate_idx
= baserate
;
715 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
717 * make sure there's no valid rate following
718 * an invalid one, just in case drivers don't
719 * take the API seriously to stop at -1.
722 info
->control
.rates
[i
].idx
= -1;
725 if (info
->control
.rates
[i
].idx
< 0) {
731 * For now assume MCS is already set up correctly, this
734 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
735 WARN_ON(info
->control
.rates
[i
].idx
> 76);
739 /* set up RTS protection if desired */
741 info
->control
.rates
[i
].flags
|=
742 IEEE80211_TX_RC_USE_RTS_CTS
;
745 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
746 sband
->n_bitrates
)) {
747 info
->control
.rates
[i
].idx
= -1;
751 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
753 /* set up short preamble */
754 if (short_preamble
&&
755 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
756 info
->control
.rates
[i
].flags
|=
757 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
759 /* set up G protection */
760 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
761 rate
->flags
& IEEE80211_RATE_ERP_G
)
762 info
->control
.rates
[i
].flags
|=
763 IEEE80211_TX_RC_USE_CTS_PROTECT
;
769 static ieee80211_tx_result debug_noinline
770 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
772 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
773 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
779 * Packet injection may want to control the sequence
780 * number, if we have no matching interface then we
781 * neither assign one ourselves nor ask the driver to.
783 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
786 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
789 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
793 * Anything but QoS data that has a sequence number field
794 * (is long enough) gets a sequence number from the global
797 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
798 /* driver should assign sequence number */
799 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
800 /* for pure STA mode without beacons, we can do it */
801 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
802 tx
->sdata
->sequence_number
+= 0x10;
807 * This should be true for injected/management frames only, for
808 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
809 * above since they are not QoS-data frames.
814 /* include per-STA, per-TID sequence counter */
816 qc
= ieee80211_get_qos_ctl(hdr
);
817 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
818 seq
= &tx
->sta
->tid_seq
[tid
];
820 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
822 /* Increase the sequence number. */
823 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
828 static int ieee80211_fragment(struct ieee80211_local
*local
,
829 struct sk_buff
*skb
, int hdrlen
,
832 struct sk_buff
*tail
= skb
, *tmp
;
833 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
834 int pos
= hdrlen
+ per_fragm
;
835 int rem
= skb
->len
- hdrlen
- per_fragm
;
837 if (WARN_ON(rem
< 0))
841 int fraglen
= per_fragm
;
846 tmp
= dev_alloc_skb(local
->tx_headroom
+
848 IEEE80211_ENCRYPT_HEADROOM
+
849 IEEE80211_ENCRYPT_TAILROOM
);
854 skb_reserve(tmp
, local
->tx_headroom
+
855 IEEE80211_ENCRYPT_HEADROOM
);
856 /* copy control information */
857 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
858 skb_copy_queue_mapping(tmp
, skb
);
859 tmp
->priority
= skb
->priority
;
862 /* copy header and data */
863 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
864 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
869 skb
->len
= hdrlen
+ per_fragm
;
873 static ieee80211_tx_result debug_noinline
874 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
876 struct sk_buff
*skb
= tx
->skb
;
877 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
878 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
879 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
883 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
887 * Warn when submitting a fragmented A-MPDU frame and drop it.
888 * This scenario is handled in ieee80211_tx_prepare but extra
889 * caution taken here as fragmented ampdu may cause Tx stop.
891 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
894 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
896 /* internal error, why is TX_FRAGMENTED set? */
897 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
901 * Now fragment the frame. This will allocate all the fragments and
902 * chain them (using skb as the first fragment) to skb->next.
903 * During transmission, we will remove the successfully transmitted
904 * fragments from this list. When the low-level driver rejects one
905 * of the fragments then we will simply pretend to accept the skb
906 * but store it away as pending.
908 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
911 /* update duration/seq/flags of fragments */
915 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
917 hdr
= (void *)skb
->data
;
918 info
= IEEE80211_SKB_CB(skb
);
921 hdr
->frame_control
|= morefrags
;
922 next_len
= skb
->next
->len
;
924 * No multi-rate retries for fragmented frames, that
925 * would completely throw off the NAV at other STAs.
927 info
->control
.rates
[1].idx
= -1;
928 info
->control
.rates
[2].idx
= -1;
929 info
->control
.rates
[3].idx
= -1;
930 info
->control
.rates
[4].idx
= -1;
931 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
932 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
934 hdr
->frame_control
&= ~morefrags
;
937 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
938 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
940 } while ((skb
= skb
->next
));
945 static ieee80211_tx_result debug_noinline
946 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
948 struct sk_buff
*skb
= tx
->skb
;
953 tx
->sta
->tx_packets
++;
955 tx
->sta
->tx_fragments
++;
956 tx
->sta
->tx_bytes
+= skb
->len
;
957 } while ((skb
= skb
->next
));
962 static ieee80211_tx_result debug_noinline
963 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
965 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
970 switch (tx
->key
->conf
.cipher
) {
971 case WLAN_CIPHER_SUITE_WEP40
:
972 case WLAN_CIPHER_SUITE_WEP104
:
973 return ieee80211_crypto_wep_encrypt(tx
);
974 case WLAN_CIPHER_SUITE_TKIP
:
975 return ieee80211_crypto_tkip_encrypt(tx
);
976 case WLAN_CIPHER_SUITE_CCMP
:
977 return ieee80211_crypto_ccmp_encrypt(tx
);
978 case WLAN_CIPHER_SUITE_AES_CMAC
:
979 return ieee80211_crypto_aes_cmac_encrypt(tx
);
981 /* handle hw-only algorithm */
982 if (info
->control
.hw_key
) {
983 ieee80211_tx_set_protected(tx
);
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
996 struct sk_buff
*skb
= tx
->skb
;
997 struct ieee80211_hdr
*hdr
;
1002 hdr
= (void *) skb
->data
;
1003 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1004 break; /* must not overwrite AID */
1005 next_len
= skb
->next
? skb
->next
->len
: 0;
1006 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1009 ieee80211_duration(tx
, group_addr
, next_len
);
1010 } while ((skb
= skb
->next
));
1015 /* actual transmit path */
1018 * deal with packet injection down monitor interface
1019 * with Radiotap Header -- only called for monitor mode interface
1021 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1022 struct sk_buff
*skb
)
1025 * this is the moment to interpret and discard the radiotap header that
1026 * must be at the start of the packet injected in Monitor mode
1028 * Need to take some care with endian-ness since radiotap
1029 * args are little-endian
1032 struct ieee80211_radiotap_iterator iterator
;
1033 struct ieee80211_radiotap_header
*rthdr
=
1034 (struct ieee80211_radiotap_header
*) skb
->data
;
1035 struct ieee80211_supported_band
*sband
;
1036 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1037 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1040 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
1042 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1043 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1046 * for every radiotap entry that is present
1047 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1048 * entries present, or -EINVAL on error)
1052 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1057 /* see if this argument is something we can use */
1058 switch (iterator
.this_arg_index
) {
1060 * You must take care when dereferencing iterator.this_arg
1061 * for multibyte types... the pointer is not aligned. Use
1062 * get_unaligned((type *)iterator.this_arg) to dereference
1063 * iterator.this_arg for type "type" safely on all arches.
1065 case IEEE80211_RADIOTAP_FLAGS
:
1066 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1068 * this indicates that the skb we have been
1069 * handed has the 32-bit FCS CRC at the end...
1070 * we should react to that by snipping it off
1071 * because it will be recomputed and added
1074 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1077 skb_trim(skb
, skb
->len
- FCS_LEN
);
1079 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1080 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1081 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1082 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1086 * Please update the file
1087 * Documentation/networking/mac80211-injection.txt
1088 * when parsing new fields here.
1096 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1100 * remove the radiotap header
1101 * iterator->_max_length was sanity-checked against
1102 * skb->len by iterator init
1104 skb_pull(skb
, iterator
._max_length
);
1109 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1110 struct sk_buff
*skb
,
1111 struct ieee80211_tx_info
*info
,
1112 struct tid_ampdu_tx
*tid_tx
,
1115 bool queued
= false;
1117 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1118 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1119 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1121 * nothing -- this aggregation session is being started
1122 * but that might still fail with the driver
1125 spin_lock(&tx
->sta
->lock
);
1127 * Need to re-check now, because we may get here
1129 * 1) in the window during which the setup is actually
1130 * already done, but not marked yet because not all
1131 * packets are spliced over to the driver pending
1132 * queue yet -- if this happened we acquire the lock
1133 * either before or after the splice happens, but
1134 * need to recheck which of these cases happened.
1136 * 2) during session teardown, if the OPERATIONAL bit
1137 * was cleared due to the teardown but the pointer
1138 * hasn't been assigned NULL yet (or we loaded it
1139 * before it was assigned) -- in this case it may
1140 * now be NULL which means we should just let the
1141 * packet pass through because splicing the frames
1142 * back is already done.
1144 tid_tx
= tx
->sta
->ampdu_mlme
.tid_tx
[tid
];
1147 /* do nothing, let packet pass through */
1148 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1149 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1152 info
->control
.vif
= &tx
->sdata
->vif
;
1153 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1154 __skb_queue_tail(&tid_tx
->pending
, skb
);
1156 spin_unlock(&tx
->sta
->lock
);
1165 static ieee80211_tx_result
1166 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1167 struct ieee80211_tx_data
*tx
,
1168 struct sk_buff
*skb
)
1170 struct ieee80211_local
*local
= sdata
->local
;
1171 struct ieee80211_hdr
*hdr
;
1172 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1176 memset(tx
, 0, sizeof(*tx
));
1180 tx
->channel
= local
->hw
.conf
.channel
;
1182 * Set this flag (used below to indicate "automatic fragmentation"),
1183 * it will be cleared/left by radiotap as desired.
1185 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1187 /* process and remove the injection radiotap header */
1188 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1189 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1193 * __ieee80211_parse_tx_radiotap has now removed
1194 * the radiotap header that was present and pre-filled
1195 * 'tx' with tx control information.
1197 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1201 * If this flag is set to true anywhere, and we get here,
1202 * we are doing the needed processing, so remove the flag
1205 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1207 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1209 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1210 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1211 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1213 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1214 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1217 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1219 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1220 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
)) {
1221 struct tid_ampdu_tx
*tid_tx
;
1223 qc
= ieee80211_get_qos_ctl(hdr
);
1224 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1226 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1230 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1233 if (unlikely(queued
))
1238 if (is_multicast_ether_addr(hdr
->addr1
)) {
1239 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1240 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1242 tx
->flags
|= IEEE80211_TX_UNICAST
;
1243 if (unlikely(local
->wifi_wme_noack_test
))
1244 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1246 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1249 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1250 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1251 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1252 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1253 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1255 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1259 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1260 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1261 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1263 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1264 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1265 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1266 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1268 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1273 static int __ieee80211_tx(struct ieee80211_local
*local
,
1274 struct sk_buff
**skbp
,
1275 struct sta_info
*sta
,
1278 struct sk_buff
*skb
= *skbp
, *next
;
1279 struct ieee80211_tx_info
*info
;
1280 struct ieee80211_sub_if_data
*sdata
;
1281 unsigned long flags
;
1286 int q
= skb_get_queue_mapping(skb
);
1288 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1289 ret
= IEEE80211_TX_OK
;
1290 if (local
->queue_stop_reasons
[q
] ||
1291 (!txpending
&& !skb_queue_empty(&local
->pending
[q
])))
1292 ret
= IEEE80211_TX_PENDING
;
1293 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1294 if (ret
!= IEEE80211_TX_OK
)
1297 info
= IEEE80211_SKB_CB(skb
);
1300 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1301 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1307 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1309 sdata
= vif_to_sdata(info
->control
.vif
);
1311 switch (sdata
->vif
.type
) {
1312 case NL80211_IFTYPE_MONITOR
:
1313 info
->control
.vif
= NULL
;
1315 case NL80211_IFTYPE_AP_VLAN
:
1316 info
->control
.vif
= &container_of(sdata
->bss
,
1317 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1324 if (sta
&& sta
->uploaded
)
1325 info
->control
.sta
= &sta
->sta
;
1327 info
->control
.sta
= NULL
;
1329 ret
= drv_tx(local
, skb
);
1330 if (WARN_ON(ret
!= NETDEV_TX_OK
&& skb
->len
!= len
)) {
1334 if (ret
!= NETDEV_TX_OK
) {
1335 info
->control
.vif
= &sdata
->vif
;
1336 return IEEE80211_TX_AGAIN
;
1340 ieee80211_led_tx(local
, 1);
1344 return IEEE80211_TX_OK
;
1348 * Invoke TX handlers, return 0 on success and non-zero if the
1349 * frame was dropped or queued.
1351 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1353 struct sk_buff
*skb
= tx
->skb
;
1354 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1355 ieee80211_tx_result res
= TX_DROP
;
1357 #define CALL_TXH(txh) \
1360 if (res != TX_CONTINUE) \
1364 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1365 CALL_TXH(ieee80211_tx_h_check_assoc
);
1366 CALL_TXH(ieee80211_tx_h_ps_buf
);
1367 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1368 CALL_TXH(ieee80211_tx_h_select_key
);
1369 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1370 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1372 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1375 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1376 CALL_TXH(ieee80211_tx_h_sequence
);
1377 CALL_TXH(ieee80211_tx_h_fragment
);
1378 /* handlers after fragment must be aware of tx info fragmentation! */
1379 CALL_TXH(ieee80211_tx_h_stats
);
1380 CALL_TXH(ieee80211_tx_h_encrypt
);
1381 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1385 if (unlikely(res
== TX_DROP
)) {
1386 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1388 struct sk_buff
*next
;
1395 } else if (unlikely(res
== TX_QUEUED
)) {
1396 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1403 static void ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1404 struct sk_buff
*skb
, bool txpending
)
1406 struct ieee80211_local
*local
= sdata
->local
;
1407 struct ieee80211_tx_data tx
;
1408 ieee80211_tx_result res_prepare
;
1409 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1410 struct sk_buff
*next
;
1411 unsigned long flags
;
1415 queue
= skb_get_queue_mapping(skb
);
1417 if (unlikely(skb
->len
< 10)) {
1424 /* initialises tx */
1425 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1427 if (unlikely(res_prepare
== TX_DROP
)) {
1431 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1436 tx
.channel
= local
->hw
.conf
.channel
;
1437 info
->band
= tx
.channel
->band
;
1439 if (invoke_tx_handlers(&tx
))
1444 ret
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1446 case IEEE80211_TX_OK
:
1448 case IEEE80211_TX_AGAIN
:
1450 * Since there are no fragmented frames on A-MPDU
1451 * queues, there's no reason for a driver to reject
1452 * a frame there, warn and drop it.
1454 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1457 case IEEE80211_TX_PENDING
:
1460 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1462 if (local
->queue_stop_reasons
[queue
] ||
1463 !skb_queue_empty(&local
->pending
[queue
])) {
1465 * if queue is stopped, queue up frames for later
1466 * transmission from the tasklet
1471 if (unlikely(txpending
))
1472 __skb_queue_head(&local
->pending
[queue
],
1475 __skb_queue_tail(&local
->pending
[queue
],
1477 } while ((skb
= next
));
1479 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1483 * otherwise retry, but this is a race condition or
1484 * a driver bug (which we warn about if it persists)
1486 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1490 if (WARN(retries
> 10, "tx refused but queue active\n"))
1510 /* device xmit handlers */
1512 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1513 struct sk_buff
*skb
,
1514 int head_need
, bool may_encrypt
)
1519 * This could be optimised, devices that do full hardware
1520 * crypto (including TKIP MMIC) need no tailroom... But we
1521 * have no drivers for such devices currently.
1524 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1525 tail_need
-= skb_tailroom(skb
);
1526 tail_need
= max_t(int, tail_need
, 0);
1529 if (head_need
|| tail_need
) {
1530 /* Sorry. Can't account for this any more */
1534 if (skb_header_cloned(skb
))
1535 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1537 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1539 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1540 wiphy_debug(local
->hw
.wiphy
,
1541 "failed to reallocate TX buffer\n");
1545 /* update truesize too */
1546 skb
->truesize
+= head_need
+ tail_need
;
1551 static void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
,
1552 struct sk_buff
*skb
)
1554 struct ieee80211_local
*local
= sdata
->local
;
1555 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1556 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1557 struct ieee80211_sub_if_data
*tmp_sdata
;
1563 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1567 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1568 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1570 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1571 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1572 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1574 /* check the header is complete in the frame */
1575 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1577 * We process outgoing injected frames that have a
1578 * local address we handle as though they are our
1580 * This code here isn't entirely correct, the local
1581 * MAC address is not necessarily enough to find
1582 * the interface to use; for that proper VLAN/WDS
1583 * support we will need a different mechanism.
1586 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1588 if (!ieee80211_sdata_running(tmp_sdata
))
1590 if (tmp_sdata
->vif
.type
==
1591 NL80211_IFTYPE_MONITOR
||
1592 tmp_sdata
->vif
.type
==
1593 NL80211_IFTYPE_AP_VLAN
||
1594 tmp_sdata
->vif
.type
==
1597 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1606 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1608 headroom
= local
->tx_headroom
;
1610 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1611 headroom
-= skb_headroom(skb
);
1612 headroom
= max_t(int, 0, headroom
);
1614 if (ieee80211_skb_resize(local
, skb
, headroom
, may_encrypt
)) {
1620 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1621 info
->control
.vif
= &sdata
->vif
;
1623 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1624 ieee80211_is_data(hdr
->frame_control
) &&
1625 !is_multicast_ether_addr(hdr
->addr1
))
1626 if (mesh_nexthop_lookup(skb
, sdata
)) {
1627 /* skb queued: don't free */
1632 ieee80211_set_qos_hdr(local
, skb
);
1633 ieee80211_tx(sdata
, skb
, false);
1637 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1638 struct net_device
*dev
)
1640 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1641 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1642 struct ieee80211_radiotap_header
*prthdr
=
1643 (struct ieee80211_radiotap_header
*)skb
->data
;
1644 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1648 * Frame injection is not allowed if beaconing is not allowed
1649 * or if we need radar detection. Beaconing is usually not allowed when
1650 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1651 * Passive scan is also used in world regulatory domains where
1652 * your country is not known and as such it should be treated as
1653 * NO TX unless the channel is explicitly allowed in which case
1654 * your current regulatory domain would not have the passive scan
1657 * Since AP mode uses monitor interfaces to inject/TX management
1658 * frames we can make AP mode the exception to this rule once it
1659 * supports radar detection as its implementation can deal with
1660 * radar detection by itself. We can do that later by adding a
1661 * monitor flag interfaces used for AP support.
1663 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1664 IEEE80211_CHAN_PASSIVE_SCAN
)))
1667 /* check for not even having the fixed radiotap header part */
1668 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1669 goto fail
; /* too short to be possibly valid */
1671 /* is it a header version we can trust to find length from? */
1672 if (unlikely(prthdr
->it_version
))
1673 goto fail
; /* only version 0 is supported */
1675 /* then there must be a radiotap header with a length we can use */
1676 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1678 /* does the skb contain enough to deliver on the alleged length? */
1679 if (unlikely(skb
->len
< len_rthdr
))
1680 goto fail
; /* skb too short for claimed rt header extent */
1683 * fix up the pointers accounting for the radiotap
1684 * header still being in there. We are being given
1685 * a precooked IEEE80211 header so no need for
1688 skb_set_mac_header(skb
, len_rthdr
);
1690 * these are just fixed to the end of the rt area since we
1691 * don't have any better information and at this point, nobody cares
1693 skb_set_network_header(skb
, len_rthdr
);
1694 skb_set_transport_header(skb
, len_rthdr
);
1696 memset(info
, 0, sizeof(*info
));
1698 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1700 /* pass the radiotap header up to xmit */
1701 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1702 return NETDEV_TX_OK
;
1706 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1710 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1711 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1712 * @skb: packet to be sent
1713 * @dev: incoming interface
1715 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1716 * not be freed, and caller is responsible for either retrying later or freeing
1719 * This function takes in an Ethernet header and encapsulates it with suitable
1720 * IEEE 802.11 header based on which interface the packet is coming in. The
1721 * encapsulated packet will then be passed to master interface, wlan#.11, for
1722 * transmission (through low-level driver).
1724 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1725 struct net_device
*dev
)
1727 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1728 struct ieee80211_local
*local
= sdata
->local
;
1729 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1730 int ret
= NETDEV_TX_BUSY
, head_need
;
1731 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1733 struct ieee80211_hdr hdr
;
1734 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1735 const u8
*encaps_data
;
1736 int encaps_len
, skip_header_bytes
;
1738 struct sta_info
*sta
= NULL
;
1740 struct sk_buff
*tmp_skb
;
1742 if (unlikely(skb
->len
< ETH_HLEN
)) {
1747 /* convert Ethernet header to proper 802.11 header (based on
1748 * operation mode) */
1749 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1750 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1752 switch (sdata
->vif
.type
) {
1753 case NL80211_IFTYPE_AP_VLAN
:
1755 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1757 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1759 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1760 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1761 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1762 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1764 sta_flags
= get_sta_flags(sta
);
1770 case NL80211_IFTYPE_AP
:
1771 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1773 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1774 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1775 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1778 case NL80211_IFTYPE_WDS
:
1779 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1781 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1782 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1783 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1784 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1787 #ifdef CONFIG_MAC80211_MESH
1788 case NL80211_IFTYPE_MESH_POINT
:
1789 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1790 /* Do not send frames with mesh_ttl == 0 */
1791 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1796 if (compare_ether_addr(sdata
->vif
.addr
,
1797 skb
->data
+ ETH_ALEN
) == 0) {
1798 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1799 skb
->data
, skb
->data
+ ETH_ALEN
);
1800 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1801 sdata
, NULL
, NULL
, NULL
);
1803 /* packet from other interface */
1804 struct mesh_path
*mppath
;
1805 int is_mesh_mcast
= 1;
1809 if (is_multicast_ether_addr(skb
->data
))
1810 /* DA TA mSA AE:SA */
1811 mesh_da
= skb
->data
;
1813 static const u8 bcast
[ETH_ALEN
] =
1814 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1816 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1818 /* RA TA mDA mSA AE:DA SA */
1819 mesh_da
= mppath
->mpp
;
1822 /* DA TA mSA AE:SA */
1826 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1827 mesh_da
, sdata
->vif
.addr
);
1831 ieee80211_new_mesh_header(&mesh_hdr
,
1833 skb
->data
+ ETH_ALEN
,
1838 ieee80211_new_mesh_header(&mesh_hdr
,
1842 skb
->data
+ ETH_ALEN
);
1847 case NL80211_IFTYPE_STATION
:
1848 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1849 if (sdata
->u
.mgd
.use_4addr
&&
1850 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1851 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1853 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1854 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1855 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1858 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1860 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1861 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1865 case NL80211_IFTYPE_ADHOC
:
1867 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1868 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1869 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1878 * There's no need to try to look up the destination
1879 * if it is a multicast address (which can only happen
1882 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1884 sta
= sta_info_get(sdata
, hdr
.addr1
);
1886 sta_flags
= get_sta_flags(sta
);
1890 /* receiver and we are QoS enabled, use a QoS type frame */
1891 if ((sta_flags
& WLAN_STA_WME
) && local
->hw
.queues
>= 4) {
1892 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1897 * Drop unicast frames to unauthorised stations unless they are
1898 * EAPOL frames from the local station.
1900 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1901 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1902 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1903 !(cpu_to_be16(ethertype
) == sdata
->control_port_protocol
&&
1904 compare_ether_addr(sdata
->vif
.addr
,
1905 skb
->data
+ ETH_ALEN
) == 0))) {
1906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1907 if (net_ratelimit())
1908 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1909 " (unauthorized port)\n", dev
->name
,
1913 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1920 * If the skb is shared we need to obtain our own copy.
1922 if (skb_shared(skb
)) {
1924 skb
= skb_copy(skb
, GFP_ATOMIC
);
1933 hdr
.frame_control
= fc
;
1934 hdr
.duration_id
= 0;
1937 skip_header_bytes
= ETH_HLEN
;
1938 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1939 encaps_data
= bridge_tunnel_header
;
1940 encaps_len
= sizeof(bridge_tunnel_header
);
1941 skip_header_bytes
-= 2;
1942 } else if (ethertype
>= 0x600) {
1943 encaps_data
= rfc1042_header
;
1944 encaps_len
= sizeof(rfc1042_header
);
1945 skip_header_bytes
-= 2;
1951 nh_pos
= skb_network_header(skb
) - skb
->data
;
1952 h_pos
= skb_transport_header(skb
) - skb
->data
;
1954 skb_pull(skb
, skip_header_bytes
);
1955 nh_pos
-= skip_header_bytes
;
1956 h_pos
-= skip_header_bytes
;
1958 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1961 * So we need to modify the skb header and hence need a copy of
1962 * that. The head_need variable above doesn't, so far, include
1963 * the needed header space that we don't need right away. If we
1964 * can, then we don't reallocate right now but only after the
1965 * frame arrives at the master device (if it does...)
1967 * If we cannot, however, then we will reallocate to include all
1968 * the ever needed space. Also, if we need to reallocate it anyway,
1969 * make it big enough for everything we may ever need.
1972 if (head_need
> 0 || skb_cloned(skb
)) {
1973 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1974 head_need
+= local
->tx_headroom
;
1975 head_need
= max_t(int, 0, head_need
);
1976 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1981 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1982 nh_pos
+= encaps_len
;
1983 h_pos
+= encaps_len
;
1986 #ifdef CONFIG_MAC80211_MESH
1987 if (meshhdrlen
> 0) {
1988 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1989 nh_pos
+= meshhdrlen
;
1990 h_pos
+= meshhdrlen
;
1994 if (ieee80211_is_data_qos(fc
)) {
1995 __le16
*qos_control
;
1997 qos_control
= (__le16
*) skb_push(skb
, 2);
1998 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2000 * Maybe we could actually set some fields here, for now just
2001 * initialise to zero to indicate no special operation.
2005 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2010 dev
->stats
.tx_packets
++;
2011 dev
->stats
.tx_bytes
+= skb
->len
;
2013 /* Update skb pointers to various headers since this modified frame
2014 * is going to go through Linux networking code that may potentially
2015 * need things like pointer to IP header. */
2016 skb_set_mac_header(skb
, 0);
2017 skb_set_network_header(skb
, nh_pos
);
2018 skb_set_transport_header(skb
, h_pos
);
2020 memset(info
, 0, sizeof(*info
));
2022 dev
->trans_start
= jiffies
;
2023 ieee80211_xmit(sdata
, skb
);
2025 return NETDEV_TX_OK
;
2028 if (ret
== NETDEV_TX_OK
)
2036 * ieee80211_clear_tx_pending may not be called in a context where
2037 * it is possible that it packets could come in again.
2039 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2043 for (i
= 0; i
< local
->hw
.queues
; i
++)
2044 skb_queue_purge(&local
->pending
[i
]);
2047 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2048 struct sk_buff
*skb
)
2050 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2051 struct ieee80211_sub_if_data
*sdata
;
2052 struct sta_info
*sta
;
2053 struct ieee80211_hdr
*hdr
;
2057 sdata
= vif_to_sdata(info
->control
.vif
);
2059 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2060 ieee80211_tx(sdata
, skb
, true);
2062 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2063 sta
= sta_info_get(sdata
, hdr
->addr1
);
2065 ret
= __ieee80211_tx(local
, &skb
, sta
, true);
2066 if (ret
!= IEEE80211_TX_OK
)
2074 * Transmit all pending packets. Called from tasklet.
2076 void ieee80211_tx_pending(unsigned long data
)
2078 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2079 struct ieee80211_sub_if_data
*sdata
;
2080 unsigned long flags
;
2086 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2087 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2089 * If queue is stopped by something other than due to pending
2090 * frames, or we have no pending frames, proceed to next queue.
2092 if (local
->queue_stop_reasons
[i
] ||
2093 skb_queue_empty(&local
->pending
[i
]))
2096 while (!skb_queue_empty(&local
->pending
[i
])) {
2097 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2098 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2100 if (WARN_ON(!info
->control
.vif
)) {
2105 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2108 txok
= ieee80211_tx_pending_skb(local
, skb
);
2110 __skb_queue_head(&local
->pending
[i
], skb
);
2111 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2117 if (skb_queue_empty(&local
->pending
[i
]))
2118 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2119 netif_wake_subqueue(sdata
->dev
, i
);
2121 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2126 /* functions for drivers to get certain frames */
2128 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2129 struct sk_buff
*skb
,
2130 struct beacon_data
*beacon
)
2134 int i
, have_bits
= 0, n1
, n2
;
2136 /* Generate bitmap for TIM only if there are any STAs in power save
2138 if (atomic_read(&bss
->num_sta_ps
) > 0)
2139 /* in the hope that this is faster than
2140 * checking byte-for-byte */
2141 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2142 IEEE80211_MAX_AID
+1);
2144 if (bss
->dtim_count
== 0)
2145 bss
->dtim_count
= beacon
->dtim_period
- 1;
2149 tim
= pos
= (u8
*) skb_put(skb
, 6);
2150 *pos
++ = WLAN_EID_TIM
;
2152 *pos
++ = bss
->dtim_count
;
2153 *pos
++ = beacon
->dtim_period
;
2155 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2159 /* Find largest even number N1 so that bits numbered 1 through
2160 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2161 * (N2 + 1) x 8 through 2007 are 0. */
2163 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2170 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2177 /* Bitmap control */
2179 /* Part Virt Bitmap */
2180 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2182 tim
[1] = n2
- n1
+ 4;
2183 skb_put(skb
, n2
- n1
);
2185 *pos
++ = aid0
; /* Bitmap control */
2186 *pos
++ = 0; /* Part Virt Bitmap */
2190 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2191 struct ieee80211_vif
*vif
,
2192 u16
*tim_offset
, u16
*tim_length
)
2194 struct ieee80211_local
*local
= hw_to_local(hw
);
2195 struct sk_buff
*skb
= NULL
;
2196 struct ieee80211_tx_info
*info
;
2197 struct ieee80211_sub_if_data
*sdata
= NULL
;
2198 struct ieee80211_if_ap
*ap
= NULL
;
2199 struct beacon_data
*beacon
;
2200 struct ieee80211_supported_band
*sband
;
2201 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2202 struct ieee80211_tx_rate_control txrc
;
2204 sband
= local
->hw
.wiphy
->bands
[band
];
2208 sdata
= vif_to_sdata(vif
);
2215 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2217 beacon
= rcu_dereference(ap
->beacon
);
2220 * headroom, head length,
2221 * tail length and maximum TIM length
2223 skb
= dev_alloc_skb(local
->tx_headroom
+
2225 beacon
->tail_len
+ 256);
2229 skb_reserve(skb
, local
->tx_headroom
);
2230 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2234 * Not very nice, but we want to allow the driver to call
2235 * ieee80211_beacon_get() as a response to the set_tim()
2236 * callback. That, however, is already invoked under the
2237 * sta_lock to guarantee consistent and race-free update
2238 * of the tim bitmap in mac80211 and the driver.
2240 if (local
->tim_in_locked_section
) {
2241 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2243 unsigned long flags
;
2245 spin_lock_irqsave(&local
->sta_lock
, flags
);
2246 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2247 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2251 *tim_offset
= beacon
->head_len
;
2253 *tim_length
= skb
->len
- beacon
->head_len
;
2256 memcpy(skb_put(skb
, beacon
->tail_len
),
2257 beacon
->tail
, beacon
->tail_len
);
2260 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2261 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2262 struct ieee80211_hdr
*hdr
;
2263 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2268 skb
= skb_copy(presp
, GFP_ATOMIC
);
2272 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2273 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2274 IEEE80211_STYPE_BEACON
);
2275 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2276 struct ieee80211_mgmt
*mgmt
;
2279 /* headroom, head length, tail length and maximum TIM length */
2280 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
2284 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2285 mgmt
= (struct ieee80211_mgmt
*)
2286 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2287 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2288 mgmt
->frame_control
=
2289 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2290 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2291 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2292 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2293 mgmt
->u
.beacon
.beacon_int
=
2294 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2295 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
2297 pos
= skb_put(skb
, 2);
2298 *pos
++ = WLAN_EID_SSID
;
2301 mesh_mgmt_ies_add(skb
, sdata
);
2307 info
= IEEE80211_SKB_CB(skb
);
2309 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2310 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2313 memset(&txrc
, 0, sizeof(txrc
));
2316 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2318 txrc
.reported_rate
.idx
= -1;
2319 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2320 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2321 txrc
.max_rate_idx
= -1;
2323 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2325 rate_control_get_rate(sdata
, NULL
, &txrc
);
2327 info
->control
.vif
= vif
;
2329 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2330 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2331 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2336 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2338 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2339 struct ieee80211_vif
*vif
)
2341 struct ieee80211_sub_if_data
*sdata
;
2342 struct ieee80211_if_managed
*ifmgd
;
2343 struct ieee80211_pspoll
*pspoll
;
2344 struct ieee80211_local
*local
;
2345 struct sk_buff
*skb
;
2347 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2350 sdata
= vif_to_sdata(vif
);
2351 ifmgd
= &sdata
->u
.mgd
;
2352 local
= sdata
->local
;
2354 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2356 printk(KERN_DEBUG
"%s: failed to allocate buffer for "
2357 "pspoll template\n", sdata
->name
);
2360 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2362 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2363 memset(pspoll
, 0, sizeof(*pspoll
));
2364 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2365 IEEE80211_STYPE_PSPOLL
);
2366 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2368 /* aid in PS-Poll has its two MSBs each set to 1 */
2369 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2371 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2372 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2376 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2378 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2379 struct ieee80211_vif
*vif
)
2381 struct ieee80211_hdr_3addr
*nullfunc
;
2382 struct ieee80211_sub_if_data
*sdata
;
2383 struct ieee80211_if_managed
*ifmgd
;
2384 struct ieee80211_local
*local
;
2385 struct sk_buff
*skb
;
2387 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2390 sdata
= vif_to_sdata(vif
);
2391 ifmgd
= &sdata
->u
.mgd
;
2392 local
= sdata
->local
;
2394 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2396 printk(KERN_DEBUG
"%s: failed to allocate buffer for nullfunc "
2397 "template\n", sdata
->name
);
2400 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2402 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2404 memset(nullfunc
, 0, sizeof(*nullfunc
));
2405 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2406 IEEE80211_STYPE_NULLFUNC
|
2407 IEEE80211_FCTL_TODS
);
2408 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2409 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2410 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2414 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2416 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2417 struct ieee80211_vif
*vif
,
2418 const u8
*ssid
, size_t ssid_len
,
2419 const u8
*ie
, size_t ie_len
)
2421 struct ieee80211_sub_if_data
*sdata
;
2422 struct ieee80211_local
*local
;
2423 struct ieee80211_hdr_3addr
*hdr
;
2424 struct sk_buff
*skb
;
2428 sdata
= vif_to_sdata(vif
);
2429 local
= sdata
->local
;
2430 ie_ssid_len
= 2 + ssid_len
;
2432 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2433 ie_ssid_len
+ ie_len
);
2435 printk(KERN_DEBUG
"%s: failed to allocate buffer for probe "
2436 "request template\n", sdata
->name
);
2440 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2442 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2443 memset(hdr
, 0, sizeof(*hdr
));
2444 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2445 IEEE80211_STYPE_PROBE_REQ
);
2446 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2447 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2448 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2450 pos
= skb_put(skb
, ie_ssid_len
);
2451 *pos
++ = WLAN_EID_SSID
;
2454 memcpy(pos
, ssid
, ssid_len
);
2458 pos
= skb_put(skb
, ie_len
);
2459 memcpy(pos
, ie
, ie_len
);
2464 EXPORT_SYMBOL(ieee80211_probereq_get
);
2466 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2467 const void *frame
, size_t frame_len
,
2468 const struct ieee80211_tx_info
*frame_txctl
,
2469 struct ieee80211_rts
*rts
)
2471 const struct ieee80211_hdr
*hdr
= frame
;
2473 rts
->frame_control
=
2474 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2475 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2477 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2478 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2480 EXPORT_SYMBOL(ieee80211_rts_get
);
2482 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2483 const void *frame
, size_t frame_len
,
2484 const struct ieee80211_tx_info
*frame_txctl
,
2485 struct ieee80211_cts
*cts
)
2487 const struct ieee80211_hdr
*hdr
= frame
;
2489 cts
->frame_control
=
2490 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2491 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2492 frame_len
, frame_txctl
);
2493 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2495 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2498 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2499 struct ieee80211_vif
*vif
)
2501 struct ieee80211_local
*local
= hw_to_local(hw
);
2502 struct sk_buff
*skb
= NULL
;
2503 struct sta_info
*sta
;
2504 struct ieee80211_tx_data tx
;
2505 struct ieee80211_sub_if_data
*sdata
;
2506 struct ieee80211_if_ap
*bss
= NULL
;
2507 struct beacon_data
*beacon
;
2508 struct ieee80211_tx_info
*info
;
2510 sdata
= vif_to_sdata(vif
);
2514 beacon
= rcu_dereference(bss
->beacon
);
2516 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2519 if (bss
->dtim_count
!= 0)
2520 goto out
; /* send buffered bc/mc only after DTIM beacon */
2523 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2526 local
->total_ps_buffered
--;
2528 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2529 struct ieee80211_hdr
*hdr
=
2530 (struct ieee80211_hdr
*) skb
->data
;
2531 /* more buffered multicast/broadcast frames ==> set
2532 * MoreData flag in IEEE 802.11 header to inform PS
2534 hdr
->frame_control
|=
2535 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2538 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2540 dev_kfree_skb_any(skb
);
2543 info
= IEEE80211_SKB_CB(skb
);
2546 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2547 tx
.channel
= local
->hw
.conf
.channel
;
2548 info
->band
= tx
.channel
->band
;
2550 if (invoke_tx_handlers(&tx
))
2557 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2559 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2561 skb_set_mac_header(skb
, 0);
2562 skb_set_network_header(skb
, 0);
2563 skb_set_transport_header(skb
, 0);
2565 /* send all internal mgmt frames on VO */
2566 skb_set_queue_mapping(skb
, 0);
2569 * The other path calling ieee80211_xmit is from the tasklet,
2570 * and while we can handle concurrent transmissions locking
2571 * requirements are that we do not come into tx with bhs on.
2574 ieee80211_xmit(sdata
, skb
);