2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
,
40 struct sk_buff
*skb
, int group_addr
,
43 int rate
, mrate
, erp
, dur
, i
;
44 struct ieee80211_rate
*txrate
;
45 struct ieee80211_local
*local
= tx
->local
;
46 struct ieee80211_supported_band
*sband
;
47 struct ieee80211_hdr
*hdr
;
48 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
50 /* assume HW handles this */
51 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
55 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
58 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
59 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
61 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr
= (struct ieee80211_hdr
*)skb
->data
;
81 if (ieee80211_is_ctl(hdr
->frame_control
)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr
) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate
= sband
->bitrates
[0].bitrate
;
119 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
120 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
122 if (r
->bitrate
> txrate
->bitrate
)
125 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
128 switch (sband
->band
) {
129 case IEEE80211_BAND_2GHZ
: {
131 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
132 flag
= IEEE80211_RATE_MANDATORY_G
;
134 flag
= IEEE80211_RATE_MANDATORY_B
;
139 case IEEE80211_BAND_5GHZ
:
140 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
143 case IEEE80211_NUM_BANDS
:
149 /* No matching basic rate found; use highest suitable mandatory
154 /* Time needed to transmit ACK
155 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
156 * to closest integer */
158 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
159 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
162 /* Frame is fragmented: duration increases with time needed to
163 * transmit next fragment plus ACK and 2 x SIFS. */
164 dur
*= 2; /* ACK + SIFS */
166 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
167 txrate
->bitrate
, erp
,
168 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
171 return cpu_to_le16(dur
);
174 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
175 struct net_device
*dev
)
177 return local
== wdev_priv(dev
->ieee80211_ptr
);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
184 struct ieee80211_local
*local
= tx
->local
;
185 struct ieee80211_if_managed
*ifmgd
;
187 /* driver doesn't support power save */
188 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
191 /* hardware does dynamic power save */
192 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
195 /* dynamic power save disabled */
196 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
199 /* we are scanning, don't enable power save */
203 if (!local
->ps_sdata
)
206 /* No point if we're going to suspend */
207 if (local
->quiescing
)
210 /* dynamic ps is supported only in managed mode */
211 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
214 ifmgd
= &tx
->sdata
->u
.mgd
;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: local->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
230 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
231 && skb_get_queue_mapping(tx
->skb
) == 0)
234 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
235 ieee80211_stop_queues_by_reason(&local
->hw
,
236 IEEE80211_QUEUE_STOP_REASON_PS
);
237 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
238 ieee80211_queue_work(&local
->hw
,
239 &local
->dynamic_ps_disable_work
);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd
->associated
)
246 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
247 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
256 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
257 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
260 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
263 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
265 !ieee80211_is_probe_req(hdr
->frame_control
) &&
266 !ieee80211_is_nullfunc(hdr
->frame_control
))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
283 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
286 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
290 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
292 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
293 if (unlikely(!assoc
&&
294 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
295 ieee80211_is_data(hdr
->frame_control
))) {
296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
297 printk(KERN_DEBUG
"%s: dropped data frame to not "
298 "associated station %pM\n",
299 tx
->sdata
->name
, hdr
->addr1
);
300 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
301 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
305 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
306 tx
->local
->num_sta
== 0 &&
307 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
309 * No associated STAs - no need to send multicast
320 /* This function is called whenever the AP is about to exceed the maximum limit
321 * of buffered frames for power saving STAs. This situation should not really
322 * happen often during normal operation, so dropping the oldest buffered packet
323 * from each queue should be OK to make some room for new frames. */
324 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
326 int total
= 0, purged
= 0;
328 struct ieee80211_sub_if_data
*sdata
;
329 struct sta_info
*sta
;
332 * virtual interfaces are protected by RCU
336 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
337 struct ieee80211_if_ap
*ap
;
338 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
341 skb
= skb_dequeue(&ap
->ps_bc_buf
);
346 total
+= skb_queue_len(&ap
->ps_bc_buf
);
350 * Drop one frame from each station from the lowest-priority
351 * AC that has frames at all.
353 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
356 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
357 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
358 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
369 local
->total_ps_buffered
= total
;
370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
371 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
376 static ieee80211_tx_result
377 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
379 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
380 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
383 * broadcast/multicast frame
385 * If any of the associated stations is in power save mode,
386 * the frame is buffered to be sent after DTIM beacon frame.
387 * This is done either by the hardware or us.
390 /* powersaving STAs only in AP/VLAN mode */
394 /* no buffering for ordered frames */
395 if (ieee80211_has_order(hdr
->frame_control
))
398 /* no stations in PS mode */
399 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
402 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
404 /* device releases frame after DTIM beacon */
405 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
408 /* buffered in mac80211 */
409 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
410 purge_old_ps_buffers(tx
->local
);
412 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
413 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
415 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
418 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
420 tx
->local
->total_ps_buffered
++;
422 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
427 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
430 if (!ieee80211_is_mgmt(fc
))
433 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
436 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
443 static ieee80211_tx_result
444 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
446 struct sta_info
*sta
= tx
->sta
;
447 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
448 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
449 struct ieee80211_local
*local
= tx
->local
;
452 ieee80211_is_probe_resp(hdr
->frame_control
) ||
453 ieee80211_is_auth(hdr
->frame_control
) ||
454 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
455 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
458 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
459 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
460 !(info
->flags
& IEEE80211_TX_CTL_POLL_RESPONSE
))) {
461 int ac
= skb_get_queue_mapping(tx
->skb
);
463 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
464 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer for AC %d\n",
465 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
466 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
467 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
468 purge_old_ps_buffers(tx
->local
);
469 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
470 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
471 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
473 printk(KERN_DEBUG
"%s: STA %pM TX buffer for "
474 "AC %d full - dropping oldest frame\n",
475 tx
->sdata
->name
, sta
->sta
.addr
, ac
);
479 tx
->local
->total_ps_buffered
++;
481 info
->control
.jiffies
= jiffies
;
482 info
->control
.vif
= &tx
->sdata
->vif
;
483 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
484 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
486 if (!timer_pending(&local
->sta_cleanup
))
487 mod_timer(&local
->sta_cleanup
,
488 round_jiffies(jiffies
+
489 STA_INFO_CLEANUP_INTERVAL
));
492 * We queued up some frames, so the TIM bit might
493 * need to be set, recalculate it.
495 sta_info_recalc_tim(sta
);
499 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
500 else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
502 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
503 tx
->sdata
->name
, sta
->sta
.addr
);
505 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
510 static ieee80211_tx_result debug_noinline
511 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
513 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
516 if (tx
->flags
& IEEE80211_TX_UNICAST
)
517 return ieee80211_tx_h_unicast_ps_buf(tx
);
519 return ieee80211_tx_h_multicast_ps_buf(tx
);
522 static ieee80211_tx_result debug_noinline
523 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
525 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
527 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
528 tx
->sdata
->control_port_no_encrypt
))
529 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
534 static ieee80211_tx_result debug_noinline
535 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
537 struct ieee80211_key
*key
= NULL
;
538 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
539 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
541 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
543 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
545 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
546 is_multicast_ether_addr(hdr
->addr1
) &&
547 ieee80211_is_robust_mgmt_frame(hdr
) &&
548 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
550 else if (is_multicast_ether_addr(hdr
->addr1
) &&
551 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
553 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
554 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
556 else if (tx
->sdata
->drop_unencrypted
&&
557 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
558 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
559 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
560 (ieee80211_is_action(hdr
->frame_control
) &&
561 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
562 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
568 bool skip_hw
= false;
570 tx
->key
->tx_rx_count
++;
571 /* TODO: add threshold stuff again */
573 switch (tx
->key
->conf
.cipher
) {
574 case WLAN_CIPHER_SUITE_WEP40
:
575 case WLAN_CIPHER_SUITE_WEP104
:
576 case WLAN_CIPHER_SUITE_TKIP
:
577 if (!ieee80211_is_data_present(hdr
->frame_control
))
580 case WLAN_CIPHER_SUITE_CCMP
:
581 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
582 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
586 skip_hw
= (tx
->key
->conf
.flags
&
587 IEEE80211_KEY_FLAG_SW_MGMT
) &&
588 ieee80211_is_mgmt(hdr
->frame_control
);
590 case WLAN_CIPHER_SUITE_AES_CMAC
:
591 if (!ieee80211_is_mgmt(hdr
->frame_control
))
596 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
599 if (!skip_hw
&& tx
->key
&&
600 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
601 info
->control
.hw_key
= &tx
->key
->conf
;
607 static ieee80211_tx_result debug_noinline
608 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
610 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
611 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
612 struct ieee80211_supported_band
*sband
;
613 struct ieee80211_rate
*rate
;
616 bool inval
= false, rts
= false, short_preamble
= false;
617 struct ieee80211_tx_rate_control txrc
;
620 memset(&txrc
, 0, sizeof(txrc
));
622 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
624 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
625 tx
->local
->hw
.wiphy
->frag_threshold
);
627 /* set up the tx rate control struct we give the RC algo */
628 txrc
.hw
= local_to_hw(tx
->local
);
630 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
632 txrc
.reported_rate
.idx
= -1;
633 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
634 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
635 txrc
.max_rate_idx
= -1;
637 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
638 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
639 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
641 /* set up RTS protection if desired */
642 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
643 txrc
.rts
= rts
= true;
647 * Use short preamble if the BSS can handle it, but not for
648 * management frames unless we know the receiver can handle
649 * that -- the management frame might be to a station that
650 * just wants a probe response.
652 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
653 (ieee80211_is_data(hdr
->frame_control
) ||
654 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
655 txrc
.short_preamble
= short_preamble
= true;
658 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
661 * Lets not bother rate control if we're associated and cannot
662 * talk to the sta. This should not happen.
664 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
665 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
666 "%s: Dropped data frame as no usable bitrate found while "
667 "scanning and associated. Target station: "
668 "%pM on %d GHz band\n",
669 tx
->sdata
->name
, hdr
->addr1
,
670 tx
->channel
->band
? 5 : 2))
674 * If we're associated with the sta at this point we know we can at
675 * least send the frame at the lowest bit rate.
677 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
679 if (unlikely(info
->control
.rates
[0].idx
< 0))
682 if (txrc
.reported_rate
.idx
< 0) {
683 txrc
.reported_rate
= info
->control
.rates
[0];
684 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
685 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
687 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
689 if (unlikely(!info
->control
.rates
[0].count
))
690 info
->control
.rates
[0].count
= 1;
692 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
693 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
694 info
->control
.rates
[0].count
= 1;
696 if (is_multicast_ether_addr(hdr
->addr1
)) {
698 * XXX: verify the rate is in the basic rateset
704 * set up the RTS/CTS rate as the fastest basic rate
705 * that is not faster than the data rate
707 * XXX: Should this check all retry rates?
709 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
712 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
714 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
715 /* must be a basic rate */
716 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
718 /* must not be faster than the data rate */
719 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
722 if (sband
->bitrates
[baserate
].bitrate
<
723 sband
->bitrates
[i
].bitrate
)
727 info
->control
.rts_cts_rate_idx
= baserate
;
730 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
732 * make sure there's no valid rate following
733 * an invalid one, just in case drivers don't
734 * take the API seriously to stop at -1.
737 info
->control
.rates
[i
].idx
= -1;
740 if (info
->control
.rates
[i
].idx
< 0) {
746 * For now assume MCS is already set up correctly, this
749 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
750 WARN_ON(info
->control
.rates
[i
].idx
> 76);
754 /* set up RTS protection if desired */
756 info
->control
.rates
[i
].flags
|=
757 IEEE80211_TX_RC_USE_RTS_CTS
;
760 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
761 sband
->n_bitrates
)) {
762 info
->control
.rates
[i
].idx
= -1;
766 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
768 /* set up short preamble */
769 if (short_preamble
&&
770 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
771 info
->control
.rates
[i
].flags
|=
772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
774 /* set up G protection */
775 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
776 rate
->flags
& IEEE80211_RATE_ERP_G
)
777 info
->control
.rates
[i
].flags
|=
778 IEEE80211_TX_RC_USE_CTS_PROTECT
;
784 static ieee80211_tx_result debug_noinline
785 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
787 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
788 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
794 * Packet injection may want to control the sequence
795 * number, if we have no matching interface then we
796 * neither assign one ourselves nor ask the driver to.
798 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
801 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
804 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
807 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
811 * Anything but QoS data that has a sequence number field
812 * (is long enough) gets a sequence number from the global
815 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
816 /* driver should assign sequence number */
817 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
818 /* for pure STA mode without beacons, we can do it */
819 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
820 tx
->sdata
->sequence_number
+= 0x10;
825 * This should be true for injected/management frames only, for
826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
827 * above since they are not QoS-data frames.
832 /* include per-STA, per-TID sequence counter */
834 qc
= ieee80211_get_qos_ctl(hdr
);
835 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
836 seq
= &tx
->sta
->tid_seq
[tid
];
838 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
840 /* Increase the sequence number. */
841 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
846 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
847 struct sk_buff
*skb
, int hdrlen
,
850 struct ieee80211_local
*local
= tx
->local
;
851 struct ieee80211_tx_info
*info
;
853 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
854 int pos
= hdrlen
+ per_fragm
;
855 int rem
= skb
->len
- hdrlen
- per_fragm
;
857 if (WARN_ON(rem
< 0))
860 /* first fragment was already added to queue by caller */
863 int fraglen
= per_fragm
;
868 tmp
= dev_alloc_skb(local
->tx_headroom
+
870 IEEE80211_ENCRYPT_HEADROOM
+
871 IEEE80211_ENCRYPT_TAILROOM
);
875 __skb_queue_tail(&tx
->skbs
, tmp
);
877 skb_reserve(tmp
, local
->tx_headroom
+
878 IEEE80211_ENCRYPT_HEADROOM
);
879 /* copy control information */
880 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
882 info
= IEEE80211_SKB_CB(tmp
);
883 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
884 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
887 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
889 skb_copy_queue_mapping(tmp
, skb
);
890 tmp
->priority
= skb
->priority
;
893 /* copy header and data */
894 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
895 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
900 /* adjust first fragment's length */
901 skb
->len
= hdrlen
+ per_fragm
;
905 static ieee80211_tx_result debug_noinline
906 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
908 struct sk_buff
*skb
= tx
->skb
;
909 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
910 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
911 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
915 /* no matter what happens, tx->skb moves to tx->skbs */
916 __skb_queue_tail(&tx
->skbs
, skb
);
919 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
922 if (tx
->local
->ops
->set_frag_threshold
)
926 * Warn when submitting a fragmented A-MPDU frame and drop it.
927 * This scenario is handled in ieee80211_tx_prepare but extra
928 * caution taken here as fragmented ampdu may cause Tx stop.
930 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
933 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
935 /* internal error, why isn't DONTFRAG set? */
936 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
940 * Now fragment the frame. This will allocate all the fragments and
941 * chain them (using skb as the first fragment) to skb->next.
942 * During transmission, we will remove the successfully transmitted
943 * fragments from this list. When the low-level driver rejects one
944 * of the fragments then we will simply pretend to accept the skb
945 * but store it away as pending.
947 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
950 /* update duration/seq/flags of fragments */
953 skb_queue_walk(&tx
->skbs
, skb
) {
955 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
957 hdr
= (void *)skb
->data
;
958 info
= IEEE80211_SKB_CB(skb
);
960 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
961 hdr
->frame_control
|= morefrags
;
963 * No multi-rate retries for fragmented frames, that
964 * would completely throw off the NAV at other STAs.
966 info
->control
.rates
[1].idx
= -1;
967 info
->control
.rates
[2].idx
= -1;
968 info
->control
.rates
[3].idx
= -1;
969 info
->control
.rates
[4].idx
= -1;
970 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
971 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
973 hdr
->frame_control
&= ~morefrags
;
976 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
983 static ieee80211_tx_result debug_noinline
984 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
991 tx
->sta
->tx_packets
++;
992 skb_queue_walk(&tx
->skbs
, skb
) {
993 tx
->sta
->tx_fragments
++;
994 tx
->sta
->tx_bytes
+= skb
->len
;
1000 static ieee80211_tx_result debug_noinline
1001 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1003 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1008 switch (tx
->key
->conf
.cipher
) {
1009 case WLAN_CIPHER_SUITE_WEP40
:
1010 case WLAN_CIPHER_SUITE_WEP104
:
1011 return ieee80211_crypto_wep_encrypt(tx
);
1012 case WLAN_CIPHER_SUITE_TKIP
:
1013 return ieee80211_crypto_tkip_encrypt(tx
);
1014 case WLAN_CIPHER_SUITE_CCMP
:
1015 return ieee80211_crypto_ccmp_encrypt(tx
);
1016 case WLAN_CIPHER_SUITE_AES_CMAC
:
1017 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1019 /* handle hw-only algorithm */
1020 if (info
->control
.hw_key
) {
1021 ieee80211_tx_set_protected(tx
);
1031 static ieee80211_tx_result debug_noinline
1032 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1034 struct sk_buff
*skb
;
1035 struct ieee80211_hdr
*hdr
;
1039 skb_queue_walk(&tx
->skbs
, skb
) {
1040 hdr
= (void *) skb
->data
;
1041 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1042 break; /* must not overwrite AID */
1043 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1044 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1045 next_len
= next
->len
;
1048 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1051 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1057 /* actual transmit path */
1059 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1060 struct sk_buff
*skb
,
1061 struct ieee80211_tx_info
*info
,
1062 struct tid_ampdu_tx
*tid_tx
,
1065 bool queued
= false;
1067 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1068 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1069 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1071 * nothing -- this aggregation session is being started
1072 * but that might still fail with the driver
1075 spin_lock(&tx
->sta
->lock
);
1077 * Need to re-check now, because we may get here
1079 * 1) in the window during which the setup is actually
1080 * already done, but not marked yet because not all
1081 * packets are spliced over to the driver pending
1082 * queue yet -- if this happened we acquire the lock
1083 * either before or after the splice happens, but
1084 * need to recheck which of these cases happened.
1086 * 2) during session teardown, if the OPERATIONAL bit
1087 * was cleared due to the teardown but the pointer
1088 * hasn't been assigned NULL yet (or we loaded it
1089 * before it was assigned) -- in this case it may
1090 * now be NULL which means we should just let the
1091 * packet pass through because splicing the frames
1092 * back is already done.
1094 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1097 /* do nothing, let packet pass through */
1098 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1099 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1102 info
->control
.vif
= &tx
->sdata
->vif
;
1103 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1104 __skb_queue_tail(&tid_tx
->pending
, skb
);
1106 spin_unlock(&tx
->sta
->lock
);
1115 static ieee80211_tx_result
1116 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1117 struct ieee80211_tx_data
*tx
,
1118 struct sk_buff
*skb
)
1120 struct ieee80211_local
*local
= sdata
->local
;
1121 struct ieee80211_hdr
*hdr
;
1122 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1126 memset(tx
, 0, sizeof(*tx
));
1130 tx
->channel
= local
->hw
.conf
.channel
;
1131 __skb_queue_head_init(&tx
->skbs
);
1134 * If this flag is set to true anywhere, and we get here,
1135 * we are doing the needed processing, so remove the flag
1138 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1140 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1142 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1143 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1144 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1146 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1147 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1150 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1152 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1153 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1154 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1155 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1156 struct tid_ampdu_tx
*tid_tx
;
1158 qc
= ieee80211_get_qos_ctl(hdr
);
1159 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1161 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1165 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1168 if (unlikely(queued
))
1173 if (is_multicast_ether_addr(hdr
->addr1
)) {
1174 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1175 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1177 tx
->flags
|= IEEE80211_TX_UNICAST
;
1178 if (unlikely(local
->wifi_wme_noack_test
))
1179 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1181 * Flags are initialized to 0. Hence, no need to
1182 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
1183 * it might already be set for injected frames.
1187 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1188 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1189 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1190 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1191 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1195 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1196 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1197 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1199 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1204 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1205 struct ieee80211_vif
*vif
,
1206 struct ieee80211_sta
*sta
,
1207 struct sk_buff_head
*skbs
,
1210 struct sk_buff
*skb
, *tmp
;
1211 struct ieee80211_tx_info
*info
;
1212 unsigned long flags
;
1214 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1215 int q
= skb_get_queue_mapping(skb
);
1217 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1218 if (local
->queue_stop_reasons
[q
] ||
1219 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1221 * Since queue is stopped, queue up frames for later
1222 * transmission from the tx-pending tasklet when the
1223 * queue is woken again.
1226 skb_queue_splice(skbs
, &local
->pending
[q
]);
1228 skb_queue_splice_tail(skbs
, &local
->pending
[q
]);
1230 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1234 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1236 info
= IEEE80211_SKB_CB(skb
);
1237 info
->control
.vif
= vif
;
1238 info
->control
.sta
= sta
;
1240 __skb_unlink(skb
, skbs
);
1248 * Returns false if the frame couldn't be transmitted but was queued instead.
1250 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1251 struct sk_buff_head
*skbs
, int led_len
,
1252 struct sta_info
*sta
, bool txpending
)
1254 struct ieee80211_tx_info
*info
;
1255 struct ieee80211_sub_if_data
*sdata
;
1256 struct ieee80211_vif
*vif
;
1257 struct ieee80211_sta
*pubsta
;
1258 struct sk_buff
*skb
;
1262 if (WARN_ON(skb_queue_empty(skbs
)))
1265 skb
= skb_peek(skbs
);
1266 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1267 info
= IEEE80211_SKB_CB(skb
);
1268 sdata
= vif_to_sdata(info
->control
.vif
);
1269 if (sta
&& !sta
->uploaded
)
1277 switch (sdata
->vif
.type
) {
1278 case NL80211_IFTYPE_MONITOR
:
1282 case NL80211_IFTYPE_AP_VLAN
:
1283 sdata
= container_of(sdata
->bss
,
1284 struct ieee80211_sub_if_data
, u
.ap
);
1291 if (local
->ops
->tx_frags
)
1292 drv_tx_frags(local
, vif
, pubsta
, skbs
);
1294 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1297 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1298 ieee80211_led_tx(local
, 1);
1300 WARN_ON(!skb_queue_empty(skbs
));
1306 * Invoke TX handlers, return 0 on success and non-zero if the
1307 * frame was dropped or queued.
1309 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1311 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1312 ieee80211_tx_result res
= TX_DROP
;
1314 #define CALL_TXH(txh) \
1317 if (res != TX_CONTINUE) \
1321 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1322 CALL_TXH(ieee80211_tx_h_check_assoc
);
1323 CALL_TXH(ieee80211_tx_h_ps_buf
);
1324 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1325 CALL_TXH(ieee80211_tx_h_select_key
);
1326 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1327 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1329 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1332 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1333 CALL_TXH(ieee80211_tx_h_sequence
);
1334 CALL_TXH(ieee80211_tx_h_fragment
);
1335 /* handlers after fragment must be aware of tx info fragmentation! */
1336 CALL_TXH(ieee80211_tx_h_stats
);
1337 CALL_TXH(ieee80211_tx_h_encrypt
);
1338 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1339 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1343 if (unlikely(res
== TX_DROP
)) {
1344 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1346 dev_kfree_skb(tx
->skb
);
1348 __skb_queue_purge(&tx
->skbs
);
1350 } else if (unlikely(res
== TX_QUEUED
)) {
1351 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1359 * Returns false if the frame couldn't be transmitted but was queued instead.
1361 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1362 struct sk_buff
*skb
, bool txpending
)
1364 struct ieee80211_local
*local
= sdata
->local
;
1365 struct ieee80211_tx_data tx
;
1366 ieee80211_tx_result res_prepare
;
1367 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1371 if (unlikely(skb
->len
< 10)) {
1378 /* initialises tx */
1380 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1382 if (unlikely(res_prepare
== TX_DROP
)) {
1385 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1389 tx
.channel
= local
->hw
.conf
.channel
;
1390 info
->band
= tx
.channel
->band
;
1392 if (!invoke_tx_handlers(&tx
))
1393 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1400 /* device xmit handlers */
1402 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1403 struct sk_buff
*skb
,
1404 int head_need
, bool may_encrypt
)
1406 struct ieee80211_local
*local
= sdata
->local
;
1409 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1410 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1411 tail_need
-= skb_tailroom(skb
);
1412 tail_need
= max_t(int, tail_need
, 0);
1415 if (skb_cloned(skb
))
1416 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1417 else if (head_need
|| tail_need
)
1418 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1422 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1423 wiphy_debug(local
->hw
.wiphy
,
1424 "failed to reallocate TX buffer\n");
1431 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1433 struct ieee80211_local
*local
= sdata
->local
;
1434 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1435 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1441 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1443 headroom
= local
->tx_headroom
;
1445 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1446 headroom
-= skb_headroom(skb
);
1447 headroom
= max_t(int, 0, headroom
);
1449 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1455 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1456 info
->control
.vif
= &sdata
->vif
;
1458 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1459 ieee80211_is_data(hdr
->frame_control
) &&
1460 !is_multicast_ether_addr(hdr
->addr1
))
1461 if (mesh_nexthop_lookup(skb
, sdata
)) {
1462 /* skb queued: don't free */
1467 ieee80211_set_qos_hdr(sdata
, skb
);
1468 ieee80211_tx(sdata
, skb
, false);
1472 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1474 struct ieee80211_radiotap_iterator iterator
;
1475 struct ieee80211_radiotap_header
*rthdr
=
1476 (struct ieee80211_radiotap_header
*) skb
->data
;
1477 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1478 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1482 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1483 IEEE80211_TX_CTL_DONTFRAG
;
1486 * for every radiotap entry that is present
1487 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1488 * entries present, or -EINVAL on error)
1492 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1497 /* see if this argument is something we can use */
1498 switch (iterator
.this_arg_index
) {
1500 * You must take care when dereferencing iterator.this_arg
1501 * for multibyte types... the pointer is not aligned. Use
1502 * get_unaligned((type *)iterator.this_arg) to dereference
1503 * iterator.this_arg for type "type" safely on all arches.
1505 case IEEE80211_RADIOTAP_FLAGS
:
1506 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1508 * this indicates that the skb we have been
1509 * handed has the 32-bit FCS CRC at the end...
1510 * we should react to that by snipping it off
1511 * because it will be recomputed and added
1514 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1517 skb_trim(skb
, skb
->len
- FCS_LEN
);
1519 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1520 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1521 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1522 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1525 case IEEE80211_RADIOTAP_TX_FLAGS
:
1526 txflags
= get_unaligned_le16(iterator
.this_arg
);
1527 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1528 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1532 * Please update the file
1533 * Documentation/networking/mac80211-injection.txt
1534 * when parsing new fields here.
1542 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1546 * remove the radiotap header
1547 * iterator->_max_length was sanity-checked against
1548 * skb->len by iterator init
1550 skb_pull(skb
, iterator
._max_length
);
1555 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1556 struct net_device
*dev
)
1558 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1559 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1560 struct ieee80211_radiotap_header
*prthdr
=
1561 (struct ieee80211_radiotap_header
*)skb
->data
;
1562 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1563 struct ieee80211_hdr
*hdr
;
1564 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1569 * Frame injection is not allowed if beaconing is not allowed
1570 * or if we need radar detection. Beaconing is usually not allowed when
1571 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1572 * Passive scan is also used in world regulatory domains where
1573 * your country is not known and as such it should be treated as
1574 * NO TX unless the channel is explicitly allowed in which case
1575 * your current regulatory domain would not have the passive scan
1578 * Since AP mode uses monitor interfaces to inject/TX management
1579 * frames we can make AP mode the exception to this rule once it
1580 * supports radar detection as its implementation can deal with
1581 * radar detection by itself. We can do that later by adding a
1582 * monitor flag interfaces used for AP support.
1584 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1585 IEEE80211_CHAN_PASSIVE_SCAN
)))
1588 /* check for not even having the fixed radiotap header part */
1589 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1590 goto fail
; /* too short to be possibly valid */
1592 /* is it a header version we can trust to find length from? */
1593 if (unlikely(prthdr
->it_version
))
1594 goto fail
; /* only version 0 is supported */
1596 /* then there must be a radiotap header with a length we can use */
1597 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1599 /* does the skb contain enough to deliver on the alleged length? */
1600 if (unlikely(skb
->len
< len_rthdr
))
1601 goto fail
; /* skb too short for claimed rt header extent */
1604 * fix up the pointers accounting for the radiotap
1605 * header still being in there. We are being given
1606 * a precooked IEEE80211 header so no need for
1609 skb_set_mac_header(skb
, len_rthdr
);
1611 * these are just fixed to the end of the rt area since we
1612 * don't have any better information and at this point, nobody cares
1614 skb_set_network_header(skb
, len_rthdr
);
1615 skb_set_transport_header(skb
, len_rthdr
);
1617 if (skb
->len
< len_rthdr
+ 2)
1620 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1621 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1623 if (skb
->len
< len_rthdr
+ hdrlen
)
1627 * Initialize skb->protocol if the injected frame is a data frame
1628 * carrying a rfc1042 header
1630 if (ieee80211_is_data(hdr
->frame_control
) &&
1631 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1632 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1634 if (compare_ether_addr(payload
, rfc1042_header
) == 0)
1635 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1639 memset(info
, 0, sizeof(*info
));
1641 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1642 IEEE80211_TX_CTL_INJECTED
;
1644 /* process and remove the injection radiotap header */
1645 if (!ieee80211_parse_tx_radiotap(skb
))
1651 * We process outgoing injected frames that have a local address
1652 * we handle as though they are non-injected frames.
1653 * This code here isn't entirely correct, the local MAC address
1654 * isn't always enough to find the interface to use; for proper
1655 * VLAN/WDS support we will need a different mechanism (which
1656 * likely isn't going to be monitor interfaces).
1658 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1660 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1661 if (!ieee80211_sdata_running(tmp_sdata
))
1663 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1664 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1665 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1667 if (compare_ether_addr(tmp_sdata
->vif
.addr
, hdr
->addr2
) == 0) {
1673 ieee80211_xmit(sdata
, skb
);
1676 return NETDEV_TX_OK
;
1680 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1684 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1685 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1686 * @skb: packet to be sent
1687 * @dev: incoming interface
1689 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1690 * not be freed, and caller is responsible for either retrying later or freeing
1693 * This function takes in an Ethernet header and encapsulates it with suitable
1694 * IEEE 802.11 header based on which interface the packet is coming in. The
1695 * encapsulated packet will then be passed to master interface, wlan#.11, for
1696 * transmission (through low-level driver).
1698 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1699 struct net_device
*dev
)
1701 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1702 struct ieee80211_local
*local
= sdata
->local
;
1703 struct ieee80211_tx_info
*info
;
1704 int ret
= NETDEV_TX_BUSY
, head_need
;
1705 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1707 struct ieee80211_hdr hdr
;
1708 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1709 struct mesh_path __maybe_unused
*mppath
= NULL
;
1710 const u8
*encaps_data
;
1711 int encaps_len
, skip_header_bytes
;
1713 struct sta_info
*sta
= NULL
;
1714 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1715 bool tdls_direct
= false;
1720 if (unlikely(skb
->len
< ETH_HLEN
)) {
1725 /* convert Ethernet header to proper 802.11 header (based on
1726 * operation mode) */
1727 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1728 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1730 switch (sdata
->vif
.type
) {
1731 case NL80211_IFTYPE_AP_VLAN
:
1733 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1735 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1737 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1738 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1739 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1740 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1742 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1743 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1749 case NL80211_IFTYPE_AP
:
1750 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1752 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1753 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1754 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1757 case NL80211_IFTYPE_WDS
:
1758 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1760 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1761 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1762 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1763 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1766 #ifdef CONFIG_MAC80211_MESH
1767 case NL80211_IFTYPE_MESH_POINT
:
1768 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1769 /* Do not send frames with mesh_ttl == 0 */
1770 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1775 if (!is_multicast_ether_addr(skb
->data
))
1776 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1779 * Use address extension if it is a packet from
1780 * another interface or if we know the destination
1781 * is being proxied by a portal (i.e. portal address
1782 * differs from proxied address)
1784 if (compare_ether_addr(sdata
->vif
.addr
,
1785 skb
->data
+ ETH_ALEN
) == 0 &&
1786 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1787 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1788 skb
->data
, skb
->data
+ ETH_ALEN
);
1790 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1793 int is_mesh_mcast
= 1;
1796 if (is_multicast_ether_addr(skb
->data
))
1797 /* DA TA mSA AE:SA */
1798 mesh_da
= skb
->data
;
1800 static const u8 bcast
[ETH_ALEN
] =
1801 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1803 /* RA TA mDA mSA AE:DA SA */
1804 mesh_da
= mppath
->mpp
;
1807 /* DA TA mSA AE:SA */
1811 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1812 mesh_da
, sdata
->vif
.addr
);
1816 ieee80211_new_mesh_header(&mesh_hdr
,
1818 skb
->data
+ ETH_ALEN
,
1822 ieee80211_new_mesh_header(&mesh_hdr
,
1825 skb
->data
+ ETH_ALEN
);
1830 case NL80211_IFTYPE_STATION
:
1831 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1832 bool tdls_peer
= false;
1835 sta
= sta_info_get(sdata
, skb
->data
);
1837 authorized
= test_sta_flag(sta
,
1838 WLAN_STA_AUTHORIZED
);
1839 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1840 tdls_peer
= test_sta_flag(sta
,
1841 WLAN_STA_TDLS_PEER
);
1842 tdls_auth
= test_sta_flag(sta
,
1843 WLAN_STA_TDLS_PEER_AUTH
);
1848 * If the TDLS link is enabled, send everything
1849 * directly. Otherwise, allow TDLS setup frames
1850 * to be transmitted indirectly.
1852 tdls_direct
= tdls_peer
&& (tdls_auth
||
1853 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1854 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1858 /* link during setup - throw out frames to peer */
1865 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1866 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1867 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1869 } else if (sdata
->u
.mgd
.use_4addr
&&
1870 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1871 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1872 IEEE80211_FCTL_TODS
);
1874 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1875 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1876 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1877 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1880 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1882 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1883 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1884 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1888 case NL80211_IFTYPE_ADHOC
:
1890 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1891 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1892 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1901 * There's no need to try to look up the destination
1902 * if it is a multicast address (which can only happen
1905 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1908 sta
= sta_info_get(sdata
, hdr
.addr1
);
1910 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1911 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1916 /* For mesh, the use of the QoS header is mandatory */
1917 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1920 /* receiver and we are QoS enabled, use a QoS type frame */
1921 if (wme_sta
&& local
->hw
.queues
>= 4) {
1922 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1927 * Drop unicast frames to unauthorised stations unless they are
1928 * EAPOL frames from the local station.
1930 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1931 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1932 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1933 compare_ether_addr(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1934 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1935 if (net_ratelimit())
1936 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1937 " (unauthorized port)\n", dev
->name
,
1941 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1947 if (unlikely(!multicast
&& skb
->sk
&&
1948 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1949 struct sk_buff
*orig_skb
= skb
;
1951 skb
= skb_clone(skb
, GFP_ATOMIC
);
1953 unsigned long flags
;
1956 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1957 r
= idr_get_new_above(&local
->ack_status_frames
,
1960 idr_pre_get(&local
->ack_status_frames
,
1962 r
= idr_get_new_above(&local
->ack_status_frames
,
1965 if (WARN_ON(!id
) || id
> 0xffff) {
1966 idr_remove(&local
->ack_status_frames
, id
);
1969 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1973 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1974 } else if (skb_shared(skb
)) {
1975 kfree_skb(orig_skb
);
1981 /* couldn't clone -- lose tx status ... */
1987 * If the skb is shared we need to obtain our own copy.
1989 if (skb_shared(skb
)) {
1990 struct sk_buff
*tmp_skb
= skb
;
1992 /* can't happen -- skb is a clone if info_id != 0 */
1995 skb
= skb_clone(skb
, GFP_ATOMIC
);
2004 hdr
.frame_control
= fc
;
2005 hdr
.duration_id
= 0;
2008 skip_header_bytes
= ETH_HLEN
;
2009 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2010 encaps_data
= bridge_tunnel_header
;
2011 encaps_len
= sizeof(bridge_tunnel_header
);
2012 skip_header_bytes
-= 2;
2013 } else if (ethertype
>= 0x600) {
2014 encaps_data
= rfc1042_header
;
2015 encaps_len
= sizeof(rfc1042_header
);
2016 skip_header_bytes
-= 2;
2022 nh_pos
= skb_network_header(skb
) - skb
->data
;
2023 h_pos
= skb_transport_header(skb
) - skb
->data
;
2025 skb_pull(skb
, skip_header_bytes
);
2026 nh_pos
-= skip_header_bytes
;
2027 h_pos
-= skip_header_bytes
;
2029 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2032 * So we need to modify the skb header and hence need a copy of
2033 * that. The head_need variable above doesn't, so far, include
2034 * the needed header space that we don't need right away. If we
2035 * can, then we don't reallocate right now but only after the
2036 * frame arrives at the master device (if it does...)
2038 * If we cannot, however, then we will reallocate to include all
2039 * the ever needed space. Also, if we need to reallocate it anyway,
2040 * make it big enough for everything we may ever need.
2043 if (head_need
> 0 || skb_cloned(skb
)) {
2044 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2045 head_need
+= local
->tx_headroom
;
2046 head_need
= max_t(int, 0, head_need
);
2047 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2052 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2053 nh_pos
+= encaps_len
;
2054 h_pos
+= encaps_len
;
2057 #ifdef CONFIG_MAC80211_MESH
2058 if (meshhdrlen
> 0) {
2059 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2060 nh_pos
+= meshhdrlen
;
2061 h_pos
+= meshhdrlen
;
2065 if (ieee80211_is_data_qos(fc
)) {
2066 __le16
*qos_control
;
2068 qos_control
= (__le16
*) skb_push(skb
, 2);
2069 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2071 * Maybe we could actually set some fields here, for now just
2072 * initialise to zero to indicate no special operation.
2076 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2081 dev
->stats
.tx_packets
++;
2082 dev
->stats
.tx_bytes
+= skb
->len
;
2084 /* Update skb pointers to various headers since this modified frame
2085 * is going to go through Linux networking code that may potentially
2086 * need things like pointer to IP header. */
2087 skb_set_mac_header(skb
, 0);
2088 skb_set_network_header(skb
, nh_pos
);
2089 skb_set_transport_header(skb
, h_pos
);
2091 info
= IEEE80211_SKB_CB(skb
);
2092 memset(info
, 0, sizeof(*info
));
2094 dev
->trans_start
= jiffies
;
2096 info
->flags
= info_flags
;
2097 info
->ack_frame_id
= info_id
;
2099 ieee80211_xmit(sdata
, skb
);
2101 return NETDEV_TX_OK
;
2104 if (ret
== NETDEV_TX_OK
)
2112 * ieee80211_clear_tx_pending may not be called in a context where
2113 * it is possible that it packets could come in again.
2115 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2119 for (i
= 0; i
< local
->hw
.queues
; i
++)
2120 skb_queue_purge(&local
->pending
[i
]);
2124 * Returns false if the frame couldn't be transmitted but was queued instead,
2125 * which in this case means re-queued -- take as an indication to stop sending
2126 * more pending frames.
2128 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2129 struct sk_buff
*skb
)
2131 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2132 struct ieee80211_sub_if_data
*sdata
;
2133 struct sta_info
*sta
;
2134 struct ieee80211_hdr
*hdr
;
2137 sdata
= vif_to_sdata(info
->control
.vif
);
2139 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2140 result
= ieee80211_tx(sdata
, skb
, true);
2142 struct sk_buff_head skbs
;
2144 __skb_queue_head_init(&skbs
);
2145 __skb_queue_tail(&skbs
, skb
);
2147 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2148 sta
= sta_info_get(sdata
, hdr
->addr1
);
2150 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2157 * Transmit all pending packets. Called from tasklet.
2159 void ieee80211_tx_pending(unsigned long data
)
2161 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2162 struct ieee80211_sub_if_data
*sdata
;
2163 unsigned long flags
;
2169 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2170 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2172 * If queue is stopped by something other than due to pending
2173 * frames, or we have no pending frames, proceed to next queue.
2175 if (local
->queue_stop_reasons
[i
] ||
2176 skb_queue_empty(&local
->pending
[i
]))
2179 while (!skb_queue_empty(&local
->pending
[i
])) {
2180 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2181 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2183 if (WARN_ON(!info
->control
.vif
)) {
2188 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2191 txok
= ieee80211_tx_pending_skb(local
, skb
);
2192 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2198 if (skb_queue_empty(&local
->pending
[i
]))
2199 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2200 netif_wake_subqueue(sdata
->dev
, i
);
2202 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2207 /* functions for drivers to get certain frames */
2209 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2210 struct sk_buff
*skb
,
2211 struct beacon_data
*beacon
)
2215 int i
, have_bits
= 0, n1
, n2
;
2217 /* Generate bitmap for TIM only if there are any STAs in power save
2219 if (atomic_read(&bss
->num_sta_ps
) > 0)
2220 /* in the hope that this is faster than
2221 * checking byte-for-byte */
2222 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2223 IEEE80211_MAX_AID
+1);
2225 if (bss
->dtim_count
== 0)
2226 bss
->dtim_count
= beacon
->dtim_period
- 1;
2230 tim
= pos
= (u8
*) skb_put(skb
, 6);
2231 *pos
++ = WLAN_EID_TIM
;
2233 *pos
++ = bss
->dtim_count
;
2234 *pos
++ = beacon
->dtim_period
;
2236 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2239 bss
->dtim_bc_mc
= aid0
== 1;
2242 /* Find largest even number N1 so that bits numbered 1 through
2243 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2244 * (N2 + 1) x 8 through 2007 are 0. */
2246 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2253 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2260 /* Bitmap control */
2262 /* Part Virt Bitmap */
2263 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2265 tim
[1] = n2
- n1
+ 4;
2266 skb_put(skb
, n2
- n1
);
2268 *pos
++ = aid0
; /* Bitmap control */
2269 *pos
++ = 0; /* Part Virt Bitmap */
2273 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2274 struct ieee80211_vif
*vif
,
2275 u16
*tim_offset
, u16
*tim_length
)
2277 struct ieee80211_local
*local
= hw_to_local(hw
);
2278 struct sk_buff
*skb
= NULL
;
2279 struct ieee80211_tx_info
*info
;
2280 struct ieee80211_sub_if_data
*sdata
= NULL
;
2281 struct ieee80211_if_ap
*ap
= NULL
;
2282 struct beacon_data
*beacon
;
2283 struct ieee80211_supported_band
*sband
;
2284 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2285 struct ieee80211_tx_rate_control txrc
;
2287 sband
= local
->hw
.wiphy
->bands
[band
];
2291 sdata
= vif_to_sdata(vif
);
2293 if (!ieee80211_sdata_running(sdata
))
2301 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2303 beacon
= rcu_dereference(ap
->beacon
);
2306 * headroom, head length,
2307 * tail length and maximum TIM length
2309 skb
= dev_alloc_skb(local
->tx_headroom
+
2311 beacon
->tail_len
+ 256);
2315 skb_reserve(skb
, local
->tx_headroom
);
2316 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2320 * Not very nice, but we want to allow the driver to call
2321 * ieee80211_beacon_get() as a response to the set_tim()
2322 * callback. That, however, is already invoked under the
2323 * sta_lock to guarantee consistent and race-free update
2324 * of the tim bitmap in mac80211 and the driver.
2326 if (local
->tim_in_locked_section
) {
2327 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2329 unsigned long flags
;
2331 spin_lock_irqsave(&local
->sta_lock
, flags
);
2332 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2333 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2337 *tim_offset
= beacon
->head_len
;
2339 *tim_length
= skb
->len
- beacon
->head_len
;
2342 memcpy(skb_put(skb
, beacon
->tail_len
),
2343 beacon
->tail
, beacon
->tail_len
);
2346 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2347 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2348 struct ieee80211_hdr
*hdr
;
2349 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2354 skb
= skb_copy(presp
, GFP_ATOMIC
);
2358 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2359 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2360 IEEE80211_STYPE_BEACON
);
2361 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2362 struct ieee80211_mgmt
*mgmt
;
2364 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2365 sizeof(mgmt
->u
.beacon
);
2367 #ifdef CONFIG_MAC80211_MESH
2368 if (!sdata
->u
.mesh
.mesh_id_len
)
2372 skb
= dev_alloc_skb(local
->tx_headroom
+
2375 2 + 8 + /* supported rates */
2376 2 + 3 + /* DS params */
2377 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2378 2 + sizeof(struct ieee80211_ht_cap
) +
2379 2 + sizeof(struct ieee80211_ht_info
) +
2380 2 + sdata
->u
.mesh
.mesh_id_len
+
2381 2 + sizeof(struct ieee80211_meshconf_ie
) +
2382 sdata
->u
.mesh
.ie_len
);
2386 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2387 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2388 memset(mgmt
, 0, hdr_len
);
2389 mgmt
->frame_control
=
2390 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2391 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2392 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2393 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2394 mgmt
->u
.beacon
.beacon_int
=
2395 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2396 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2397 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2399 pos
= skb_put(skb
, 2);
2400 *pos
++ = WLAN_EID_SSID
;
2403 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
) ||
2404 mesh_add_ds_params_ie(skb
, sdata
) ||
2405 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
) ||
2406 mesh_add_rsn_ie(skb
, sdata
) ||
2407 mesh_add_ht_cap_ie(skb
, sdata
) ||
2408 mesh_add_ht_info_ie(skb
, sdata
) ||
2409 mesh_add_meshid_ie(skb
, sdata
) ||
2410 mesh_add_meshconf_ie(skb
, sdata
) ||
2411 mesh_add_vendor_ies(skb
, sdata
)) {
2412 pr_err("o11s: couldn't add ies!\n");
2420 info
= IEEE80211_SKB_CB(skb
);
2422 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2423 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2426 memset(&txrc
, 0, sizeof(txrc
));
2429 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2431 txrc
.reported_rate
.idx
= -1;
2432 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2433 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2434 txrc
.max_rate_idx
= -1;
2436 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2438 rate_control_get_rate(sdata
, NULL
, &txrc
);
2440 info
->control
.vif
= vif
;
2442 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2443 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2444 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2449 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2451 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2452 struct ieee80211_vif
*vif
)
2454 struct ieee80211_if_ap
*ap
= NULL
;
2455 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2456 struct ieee80211_hdr
*hdr
;
2457 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2459 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2465 presp
= rcu_dereference(ap
->probe_resp
);
2469 skb
= skb_copy(presp
, GFP_ATOMIC
);
2473 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2474 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2480 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2482 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2483 struct ieee80211_vif
*vif
)
2485 struct ieee80211_sub_if_data
*sdata
;
2486 struct ieee80211_if_managed
*ifmgd
;
2487 struct ieee80211_pspoll
*pspoll
;
2488 struct ieee80211_local
*local
;
2489 struct sk_buff
*skb
;
2491 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2494 sdata
= vif_to_sdata(vif
);
2495 ifmgd
= &sdata
->u
.mgd
;
2496 local
= sdata
->local
;
2498 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2502 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2504 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2505 memset(pspoll
, 0, sizeof(*pspoll
));
2506 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2507 IEEE80211_STYPE_PSPOLL
);
2508 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2510 /* aid in PS-Poll has its two MSBs each set to 1 */
2511 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2513 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2514 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2518 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2520 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2521 struct ieee80211_vif
*vif
)
2523 struct ieee80211_hdr_3addr
*nullfunc
;
2524 struct ieee80211_sub_if_data
*sdata
;
2525 struct ieee80211_if_managed
*ifmgd
;
2526 struct ieee80211_local
*local
;
2527 struct sk_buff
*skb
;
2529 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2532 sdata
= vif_to_sdata(vif
);
2533 ifmgd
= &sdata
->u
.mgd
;
2534 local
= sdata
->local
;
2536 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2540 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2542 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2544 memset(nullfunc
, 0, sizeof(*nullfunc
));
2545 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2546 IEEE80211_STYPE_NULLFUNC
|
2547 IEEE80211_FCTL_TODS
);
2548 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2549 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2550 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2554 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2556 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2557 struct ieee80211_vif
*vif
,
2558 const u8
*ssid
, size_t ssid_len
,
2559 const u8
*ie
, size_t ie_len
)
2561 struct ieee80211_sub_if_data
*sdata
;
2562 struct ieee80211_local
*local
;
2563 struct ieee80211_hdr_3addr
*hdr
;
2564 struct sk_buff
*skb
;
2568 sdata
= vif_to_sdata(vif
);
2569 local
= sdata
->local
;
2570 ie_ssid_len
= 2 + ssid_len
;
2572 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2573 ie_ssid_len
+ ie_len
);
2577 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2579 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2580 memset(hdr
, 0, sizeof(*hdr
));
2581 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2582 IEEE80211_STYPE_PROBE_REQ
);
2583 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2584 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2585 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2587 pos
= skb_put(skb
, ie_ssid_len
);
2588 *pos
++ = WLAN_EID_SSID
;
2591 memcpy(pos
, ssid
, ssid_len
);
2595 pos
= skb_put(skb
, ie_len
);
2596 memcpy(pos
, ie
, ie_len
);
2601 EXPORT_SYMBOL(ieee80211_probereq_get
);
2603 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2604 const void *frame
, size_t frame_len
,
2605 const struct ieee80211_tx_info
*frame_txctl
,
2606 struct ieee80211_rts
*rts
)
2608 const struct ieee80211_hdr
*hdr
= frame
;
2610 rts
->frame_control
=
2611 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2612 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2614 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2615 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2617 EXPORT_SYMBOL(ieee80211_rts_get
);
2619 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2620 const void *frame
, size_t frame_len
,
2621 const struct ieee80211_tx_info
*frame_txctl
,
2622 struct ieee80211_cts
*cts
)
2624 const struct ieee80211_hdr
*hdr
= frame
;
2626 cts
->frame_control
=
2627 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2628 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2629 frame_len
, frame_txctl
);
2630 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2632 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2635 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2636 struct ieee80211_vif
*vif
)
2638 struct ieee80211_local
*local
= hw_to_local(hw
);
2639 struct sk_buff
*skb
= NULL
;
2640 struct ieee80211_tx_data tx
;
2641 struct ieee80211_sub_if_data
*sdata
;
2642 struct ieee80211_if_ap
*bss
= NULL
;
2643 struct beacon_data
*beacon
;
2644 struct ieee80211_tx_info
*info
;
2646 sdata
= vif_to_sdata(vif
);
2650 beacon
= rcu_dereference(bss
->beacon
);
2652 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2655 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2656 goto out
; /* send buffered bc/mc only after DTIM beacon */
2659 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2662 local
->total_ps_buffered
--;
2664 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2665 struct ieee80211_hdr
*hdr
=
2666 (struct ieee80211_hdr
*) skb
->data
;
2667 /* more buffered multicast/broadcast frames ==> set
2668 * MoreData flag in IEEE 802.11 header to inform PS
2670 hdr
->frame_control
|=
2671 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2674 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2676 dev_kfree_skb_any(skb
);
2679 info
= IEEE80211_SKB_CB(skb
);
2681 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2682 tx
.channel
= local
->hw
.conf
.channel
;
2683 info
->band
= tx
.channel
->band
;
2685 if (invoke_tx_handlers(&tx
))
2692 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2694 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2696 skb_set_mac_header(skb
, 0);
2697 skb_set_network_header(skb
, 0);
2698 skb_set_transport_header(skb
, 0);
2700 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2701 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
2705 * The other path calling ieee80211_xmit is from the tasklet,
2706 * and while we can handle concurrent transmissions locking
2707 * requirements are that we do not come into tx with bhs on.
2710 ieee80211_xmit(sdata
, skb
);