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_BAND_60GHZ
:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS
:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
158 *(ieee80211_get_qos_ctl(hdr
)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur
= ieee80211_frame_duration(sband
->band
, 10, rate
, erp
,
165 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur
*= 2; /* ACK + SIFS */
172 dur
+= ieee80211_frame_duration(sband
->band
, next_frag_len
,
173 txrate
->bitrate
, erp
,
174 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
177 return cpu_to_le16(dur
);
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: ifmgd->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 (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
) &&
231 skb_get_queue_mapping(tx
->skb
) == IEEE80211_AC_VO
)
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 ieee80211_is_data(hdr
->frame_control
))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx
->sdata
,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
303 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
304 ieee80211_is_data(hdr
->frame_control
) &&
305 !atomic_read(&tx
->sdata
->u
.ap
.num_mcast_sta
))) {
307 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
322 int total
= 0, purged
= 0;
324 struct ieee80211_sub_if_data
*sdata
;
325 struct sta_info
*sta
;
328 * virtual interfaces are protected by RCU
332 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
333 struct ieee80211_if_ap
*ap
;
334 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
337 skb
= skb_dequeue(&ap
->ps_bc_buf
);
342 total
+= skb_queue_len(&ap
->ps_bc_buf
);
346 * Drop one frame from each station from the lowest-priority
347 * AC that has frames at all.
349 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
352 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
353 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
354 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
365 local
->total_ps_buffered
= total
;
366 ps_dbg_hw(&local
->hw
, "PS buffers full - purged %d frames\n", purged
);
369 static ieee80211_tx_result
370 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
372 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
373 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
376 * broadcast/multicast frame
378 * If any of the associated stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs only in AP/VLAN mode */
387 /* no buffering for ordered frames */
388 if (ieee80211_has_order(hdr
->frame_control
))
391 /* no stations in PS mode */
392 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
395 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
396 if (tx
->local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
397 info
->hw_queue
= tx
->sdata
->vif
.cab_queue
;
399 /* device releases frame after DTIM beacon */
400 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
403 /* buffered in mac80211 */
404 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
405 purge_old_ps_buffers(tx
->local
);
407 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
409 "BC TX buffer full - dropping the oldest frame\n");
410 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
412 tx
->local
->total_ps_buffered
++;
414 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
419 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
422 if (!ieee80211_is_mgmt(fc
))
425 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
428 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
435 static ieee80211_tx_result
436 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
438 struct sta_info
*sta
= tx
->sta
;
439 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
440 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
441 struct ieee80211_local
*local
= tx
->local
;
446 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
447 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
448 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
449 int ac
= skb_get_queue_mapping(tx
->skb
);
451 /* only deauth, disassoc and action are bufferable MMPDUs */
452 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
453 !ieee80211_is_deauth(hdr
->frame_control
) &&
454 !ieee80211_is_disassoc(hdr
->frame_control
) &&
455 !ieee80211_is_action(hdr
->frame_control
)) {
456 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
460 ps_dbg(sta
->sdata
, "STA %pM aid %d: PS buffer for AC %d\n",
461 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
462 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
463 purge_old_ps_buffers(tx
->local
);
464 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
465 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
467 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
471 tx
->local
->total_ps_buffered
++;
473 info
->control
.jiffies
= jiffies
;
474 info
->control
.vif
= &tx
->sdata
->vif
;
475 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
476 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
478 if (!timer_pending(&local
->sta_cleanup
))
479 mod_timer(&local
->sta_cleanup
,
480 round_jiffies(jiffies
+
481 STA_INFO_CLEANUP_INTERVAL
));
484 * We queued up some frames, so the TIM bit might
485 * need to be set, recalculate it.
487 sta_info_recalc_tim(sta
);
490 } else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
492 "STA %pM in PS mode, but polling/in SP -> send frame\n",
499 static ieee80211_tx_result debug_noinline
500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
502 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
505 if (tx
->flags
& IEEE80211_TX_UNICAST
)
506 return ieee80211_tx_h_unicast_ps_buf(tx
);
508 return ieee80211_tx_h_multicast_ps_buf(tx
);
511 static ieee80211_tx_result debug_noinline
512 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
514 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
516 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
517 tx
->sdata
->control_port_no_encrypt
))
518 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
526 struct ieee80211_key
*key
= NULL
;
527 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
528 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
530 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
532 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
534 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
535 is_multicast_ether_addr(hdr
->addr1
) &&
536 ieee80211_is_robust_mgmt_frame(hdr
) &&
537 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
539 else if (is_multicast_ether_addr(hdr
->addr1
) &&
540 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
542 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
543 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
545 else if (tx
->sdata
->drop_unencrypted
&&
546 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
547 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
548 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
549 (ieee80211_is_action(hdr
->frame_control
) &&
550 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
551 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
557 bool skip_hw
= false;
559 tx
->key
->tx_rx_count
++;
560 /* TODO: add threshold stuff again */
562 switch (tx
->key
->conf
.cipher
) {
563 case WLAN_CIPHER_SUITE_WEP40
:
564 case WLAN_CIPHER_SUITE_WEP104
:
565 case WLAN_CIPHER_SUITE_TKIP
:
566 if (!ieee80211_is_data_present(hdr
->frame_control
))
569 case WLAN_CIPHER_SUITE_CCMP
:
570 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
571 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
575 skip_hw
= (tx
->key
->conf
.flags
&
576 IEEE80211_KEY_FLAG_SW_MGMT
) &&
577 ieee80211_is_mgmt(hdr
->frame_control
);
579 case WLAN_CIPHER_SUITE_AES_CMAC
:
580 if (!ieee80211_is_mgmt(hdr
->frame_control
))
585 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
588 if (!skip_hw
&& tx
->key
&&
589 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
590 info
->control
.hw_key
= &tx
->key
->conf
;
596 static ieee80211_tx_result debug_noinline
597 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
599 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
600 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
601 struct ieee80211_supported_band
*sband
;
602 struct ieee80211_rate
*rate
;
605 bool inval
= false, rts
= false, short_preamble
= false;
606 struct ieee80211_tx_rate_control txrc
;
609 memset(&txrc
, 0, sizeof(txrc
));
611 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
613 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
614 tx
->local
->hw
.wiphy
->frag_threshold
);
616 /* set up the tx rate control struct we give the RC algo */
617 txrc
.hw
= &tx
->local
->hw
;
619 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
621 txrc
.reported_rate
.idx
= -1;
622 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
623 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
624 txrc
.max_rate_idx
= -1;
626 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
627 memcpy(txrc
.rate_idx_mcs_mask
,
628 tx
->sdata
->rc_rateidx_mcs_mask
[tx
->channel
->band
],
629 sizeof(txrc
.rate_idx_mcs_mask
));
630 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
631 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
632 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
634 /* set up RTS protection if desired */
635 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
636 txrc
.rts
= rts
= true;
640 * Use short preamble if the BSS can handle it, but not for
641 * management frames unless we know the receiver can handle
642 * that -- the management frame might be to a station that
643 * just wants a probe response.
645 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
646 (ieee80211_is_data(hdr
->frame_control
) ||
647 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
648 txrc
.short_preamble
= short_preamble
= true;
651 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
654 * Lets not bother rate control if we're associated and cannot
655 * talk to the sta. This should not happen.
657 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
658 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
659 "%s: Dropped data frame as no usable bitrate found while "
660 "scanning and associated. Target station: "
661 "%pM on %d GHz band\n",
662 tx
->sdata
->name
, hdr
->addr1
,
663 tx
->channel
->band
? 5 : 2))
667 * If we're associated with the sta at this point we know we can at
668 * least send the frame at the lowest bit rate.
670 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
672 if (unlikely(info
->control
.rates
[0].idx
< 0))
675 if (txrc
.reported_rate
.idx
< 0) {
676 txrc
.reported_rate
= info
->control
.rates
[0];
677 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
678 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
680 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
682 if (unlikely(!info
->control
.rates
[0].count
))
683 info
->control
.rates
[0].count
= 1;
685 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
686 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
687 info
->control
.rates
[0].count
= 1;
689 if (is_multicast_ether_addr(hdr
->addr1
)) {
691 * XXX: verify the rate is in the basic rateset
697 * set up the RTS/CTS rate as the fastest basic rate
698 * that is not faster than the data rate
700 * XXX: Should this check all retry rates?
702 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
705 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
707 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
708 /* must be a basic rate */
709 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
711 /* must not be faster than the data rate */
712 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
715 if (sband
->bitrates
[baserate
].bitrate
<
716 sband
->bitrates
[i
].bitrate
)
720 info
->control
.rts_cts_rate_idx
= baserate
;
723 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
725 * make sure there's no valid rate following
726 * an invalid one, just in case drivers don't
727 * take the API seriously to stop at -1.
730 info
->control
.rates
[i
].idx
= -1;
733 if (info
->control
.rates
[i
].idx
< 0) {
739 * For now assume MCS is already set up correctly, this
742 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
743 WARN_ON(info
->control
.rates
[i
].idx
> 76);
747 /* set up RTS protection if desired */
749 info
->control
.rates
[i
].flags
|=
750 IEEE80211_TX_RC_USE_RTS_CTS
;
753 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
754 sband
->n_bitrates
)) {
755 info
->control
.rates
[i
].idx
= -1;
759 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
761 /* set up short preamble */
762 if (short_preamble
&&
763 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
764 info
->control
.rates
[i
].flags
|=
765 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
767 /* set up G protection */
768 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
769 rate
->flags
& IEEE80211_RATE_ERP_G
)
770 info
->control
.rates
[i
].flags
|=
771 IEEE80211_TX_RC_USE_CTS_PROTECT
;
777 static ieee80211_tx_result debug_noinline
778 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
780 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
781 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
787 * Packet injection may want to control the sequence
788 * number, if we have no matching interface then we
789 * neither assign one ourselves nor ask the driver to.
791 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
794 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
797 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
800 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
804 * Anything but QoS data that has a sequence number field
805 * (is long enough) gets a sequence number from the global
808 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
809 /* driver should assign sequence number */
810 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
811 /* for pure STA mode without beacons, we can do it */
812 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
813 tx
->sdata
->sequence_number
+= 0x10;
818 * This should be true for injected/management frames only, for
819 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
820 * above since they are not QoS-data frames.
825 /* include per-STA, per-TID sequence counter */
827 qc
= ieee80211_get_qos_ctl(hdr
);
828 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
829 seq
= &tx
->sta
->tid_seq
[tid
];
831 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
833 /* Increase the sequence number. */
834 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
839 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
840 struct sk_buff
*skb
, int hdrlen
,
843 struct ieee80211_local
*local
= tx
->local
;
844 struct ieee80211_tx_info
*info
;
846 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
847 int pos
= hdrlen
+ per_fragm
;
848 int rem
= skb
->len
- hdrlen
- per_fragm
;
850 if (WARN_ON(rem
< 0))
853 /* first fragment was already added to queue by caller */
856 int fraglen
= per_fragm
;
861 tmp
= dev_alloc_skb(local
->tx_headroom
+
863 IEEE80211_ENCRYPT_HEADROOM
+
864 IEEE80211_ENCRYPT_TAILROOM
);
868 __skb_queue_tail(&tx
->skbs
, tmp
);
870 skb_reserve(tmp
, local
->tx_headroom
+
871 IEEE80211_ENCRYPT_HEADROOM
);
872 /* copy control information */
873 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
875 info
= IEEE80211_SKB_CB(tmp
);
876 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
877 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
880 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
882 skb_copy_queue_mapping(tmp
, skb
);
883 tmp
->priority
= skb
->priority
;
886 /* copy header and data */
887 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
888 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
893 /* adjust first fragment's length */
894 skb
->len
= hdrlen
+ per_fragm
;
898 static ieee80211_tx_result debug_noinline
899 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
901 struct sk_buff
*skb
= tx
->skb
;
902 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
903 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
904 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
908 /* no matter what happens, tx->skb moves to tx->skbs */
909 __skb_queue_tail(&tx
->skbs
, skb
);
912 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
915 if (tx
->local
->ops
->set_frag_threshold
)
919 * Warn when submitting a fragmented A-MPDU frame and drop it.
920 * This scenario is handled in ieee80211_tx_prepare but extra
921 * caution taken here as fragmented ampdu may cause Tx stop.
923 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
926 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
928 /* internal error, why isn't DONTFRAG set? */
929 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
933 * Now fragment the frame. This will allocate all the fragments and
934 * chain them (using skb as the first fragment) to skb->next.
935 * During transmission, we will remove the successfully transmitted
936 * fragments from this list. When the low-level driver rejects one
937 * of the fragments then we will simply pretend to accept the skb
938 * but store it away as pending.
940 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
943 /* update duration/seq/flags of fragments */
946 skb_queue_walk(&tx
->skbs
, skb
) {
948 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
950 hdr
= (void *)skb
->data
;
951 info
= IEEE80211_SKB_CB(skb
);
953 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
954 hdr
->frame_control
|= morefrags
;
956 * No multi-rate retries for fragmented frames, that
957 * would completely throw off the NAV at other STAs.
959 info
->control
.rates
[1].idx
= -1;
960 info
->control
.rates
[2].idx
= -1;
961 info
->control
.rates
[3].idx
= -1;
962 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 4);
963 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
965 hdr
->frame_control
&= ~morefrags
;
968 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
975 static ieee80211_tx_result debug_noinline
976 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
983 tx
->sta
->tx_packets
++;
984 skb_queue_walk(&tx
->skbs
, skb
) {
985 tx
->sta
->tx_fragments
++;
986 tx
->sta
->tx_bytes
+= skb
->len
;
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
998 switch (tx
->key
->conf
.cipher
) {
999 case WLAN_CIPHER_SUITE_WEP40
:
1000 case WLAN_CIPHER_SUITE_WEP104
:
1001 return ieee80211_crypto_wep_encrypt(tx
);
1002 case WLAN_CIPHER_SUITE_TKIP
:
1003 return ieee80211_crypto_tkip_encrypt(tx
);
1004 case WLAN_CIPHER_SUITE_CCMP
:
1005 return ieee80211_crypto_ccmp_encrypt(tx
);
1006 case WLAN_CIPHER_SUITE_AES_CMAC
:
1007 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1009 return ieee80211_crypto_hw_encrypt(tx
);
1015 static ieee80211_tx_result debug_noinline
1016 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1018 struct sk_buff
*skb
;
1019 struct ieee80211_hdr
*hdr
;
1023 skb_queue_walk(&tx
->skbs
, skb
) {
1024 hdr
= (void *) skb
->data
;
1025 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1026 break; /* must not overwrite AID */
1027 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1028 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1029 next_len
= next
->len
;
1032 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1035 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1041 /* actual transmit path */
1043 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1044 struct sk_buff
*skb
,
1045 struct ieee80211_tx_info
*info
,
1046 struct tid_ampdu_tx
*tid_tx
,
1049 bool queued
= false;
1050 bool reset_agg_timer
= false;
1051 struct sk_buff
*purge_skb
= NULL
;
1053 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1054 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1055 reset_agg_timer
= true;
1056 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1058 * nothing -- this aggregation session is being started
1059 * but that might still fail with the driver
1062 spin_lock(&tx
->sta
->lock
);
1064 * Need to re-check now, because we may get here
1066 * 1) in the window during which the setup is actually
1067 * already done, but not marked yet because not all
1068 * packets are spliced over to the driver pending
1069 * queue yet -- if this happened we acquire the lock
1070 * either before or after the splice happens, but
1071 * need to recheck which of these cases happened.
1073 * 2) during session teardown, if the OPERATIONAL bit
1074 * was cleared due to the teardown but the pointer
1075 * hasn't been assigned NULL yet (or we loaded it
1076 * before it was assigned) -- in this case it may
1077 * now be NULL which means we should just let the
1078 * packet pass through because splicing the frames
1079 * back is already done.
1081 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1084 /* do nothing, let packet pass through */
1085 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1086 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1087 reset_agg_timer
= true;
1090 info
->control
.vif
= &tx
->sdata
->vif
;
1091 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1092 __skb_queue_tail(&tid_tx
->pending
, skb
);
1093 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1094 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1096 spin_unlock(&tx
->sta
->lock
);
1099 dev_kfree_skb(purge_skb
);
1102 /* reset session timer */
1103 if (reset_agg_timer
&& tid_tx
->timeout
)
1104 tid_tx
->last_tx
= jiffies
;
1112 static ieee80211_tx_result
1113 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1114 struct ieee80211_tx_data
*tx
,
1115 struct sk_buff
*skb
)
1117 struct ieee80211_local
*local
= sdata
->local
;
1118 struct ieee80211_hdr
*hdr
;
1119 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1123 memset(tx
, 0, sizeof(*tx
));
1127 tx
->channel
= local
->hw
.conf
.channel
;
1128 __skb_queue_head_init(&tx
->skbs
);
1131 * If this flag is set to true anywhere, and we get here,
1132 * we are doing the needed processing, so remove the flag
1135 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1137 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1139 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1140 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1141 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1143 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
||
1144 tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
) {
1145 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1148 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1150 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1151 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1152 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1153 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1154 struct tid_ampdu_tx
*tid_tx
;
1156 qc
= ieee80211_get_qos_ctl(hdr
);
1157 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1159 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1163 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1166 if (unlikely(queued
))
1171 if (is_multicast_ether_addr(hdr
->addr1
)) {
1172 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1173 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1175 tx
->flags
|= IEEE80211_TX_UNICAST
;
1177 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1178 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1179 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1180 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1181 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1185 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1186 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1187 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1189 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1194 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1195 struct ieee80211_vif
*vif
,
1196 struct ieee80211_sta
*sta
,
1197 struct sk_buff_head
*skbs
,
1200 struct sk_buff
*skb
, *tmp
;
1201 unsigned long flags
;
1203 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1204 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1205 int q
= info
->hw_queue
;
1207 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1208 if (WARN_ON_ONCE(q
>= local
->hw
.queues
)) {
1209 __skb_unlink(skb
, skbs
);
1215 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1216 if (local
->queue_stop_reasons
[q
] ||
1217 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1219 * Since queue is stopped, queue up frames for later
1220 * transmission from the tx-pending tasklet when the
1221 * queue is woken again.
1224 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1226 skb_queue_splice_tail_init(skbs
,
1227 &local
->pending
[q
]);
1229 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1233 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1235 info
->control
.vif
= vif
;
1236 info
->control
.sta
= sta
;
1238 __skb_unlink(skb
, skbs
);
1246 * Returns false if the frame couldn't be transmitted but was queued instead.
1248 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1249 struct sk_buff_head
*skbs
, int led_len
,
1250 struct sta_info
*sta
, bool txpending
)
1252 struct ieee80211_tx_info
*info
;
1253 struct ieee80211_sub_if_data
*sdata
;
1254 struct ieee80211_vif
*vif
;
1255 struct ieee80211_sta
*pubsta
;
1256 struct sk_buff
*skb
;
1260 if (WARN_ON(skb_queue_empty(skbs
)))
1263 skb
= skb_peek(skbs
);
1264 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1265 info
= IEEE80211_SKB_CB(skb
);
1266 sdata
= vif_to_sdata(info
->control
.vif
);
1267 if (sta
&& !sta
->uploaded
)
1275 switch (sdata
->vif
.type
) {
1276 case NL80211_IFTYPE_MONITOR
:
1277 sdata
= rcu_dereference(local
->monitor_sdata
);
1281 vif
->hw_queue
[skb_get_queue_mapping(skb
)];
1282 } else if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
) {
1288 case NL80211_IFTYPE_AP_VLAN
:
1289 sdata
= container_of(sdata
->bss
,
1290 struct ieee80211_sub_if_data
, u
.ap
);
1297 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1300 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1301 ieee80211_led_tx(local
, 1);
1303 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1309 * Invoke TX handlers, return 0 on success and non-zero if the
1310 * frame was dropped or queued.
1312 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1314 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1315 ieee80211_tx_result res
= TX_DROP
;
1317 #define CALL_TXH(txh) \
1320 if (res != TX_CONTINUE) \
1324 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1325 CALL_TXH(ieee80211_tx_h_check_assoc
);
1326 CALL_TXH(ieee80211_tx_h_ps_buf
);
1327 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1328 CALL_TXH(ieee80211_tx_h_select_key
);
1329 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1330 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1332 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1333 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1338 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1339 CALL_TXH(ieee80211_tx_h_sequence
);
1340 CALL_TXH(ieee80211_tx_h_fragment
);
1341 /* handlers after fragment must be aware of tx info fragmentation! */
1342 CALL_TXH(ieee80211_tx_h_stats
);
1343 CALL_TXH(ieee80211_tx_h_encrypt
);
1344 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1345 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1349 if (unlikely(res
== TX_DROP
)) {
1350 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1352 dev_kfree_skb(tx
->skb
);
1354 __skb_queue_purge(&tx
->skbs
);
1356 } else if (unlikely(res
== TX_QUEUED
)) {
1357 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1365 * Returns false if the frame couldn't be transmitted but was queued instead.
1367 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1368 struct sk_buff
*skb
, bool txpending
)
1370 struct ieee80211_local
*local
= sdata
->local
;
1371 struct ieee80211_tx_data tx
;
1372 ieee80211_tx_result res_prepare
;
1373 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1377 if (unlikely(skb
->len
< 10)) {
1384 /* initialises tx */
1386 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1388 if (unlikely(res_prepare
== TX_DROP
)) {
1391 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1395 tx
.channel
= local
->hw
.conf
.channel
;
1396 info
->band
= tx
.channel
->band
;
1398 /* set up hw_queue value early */
1399 if (!(info
->flags
& IEEE80211_TX_CTL_TX_OFFCHAN
) ||
1400 !(local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
))
1402 sdata
->vif
.hw_queue
[skb_get_queue_mapping(skb
)];
1404 if (!invoke_tx_handlers(&tx
))
1405 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1412 /* device xmit handlers */
1414 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1415 struct sk_buff
*skb
,
1416 int head_need
, bool may_encrypt
)
1418 struct ieee80211_local
*local
= sdata
->local
;
1421 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1422 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1423 tail_need
-= skb_tailroom(skb
);
1424 tail_need
= max_t(int, tail_need
, 0);
1427 if (skb_cloned(skb
))
1428 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1429 else if (head_need
|| tail_need
)
1430 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1434 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1435 wiphy_debug(local
->hw
.wiphy
,
1436 "failed to reallocate TX buffer\n");
1443 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1445 struct ieee80211_local
*local
= sdata
->local
;
1446 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1447 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1453 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1455 headroom
= local
->tx_headroom
;
1457 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1458 headroom
-= skb_headroom(skb
);
1459 headroom
= max_t(int, 0, headroom
);
1461 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1467 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1468 info
->control
.vif
= &sdata
->vif
;
1470 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1471 ieee80211_is_data(hdr
->frame_control
) &&
1472 !is_multicast_ether_addr(hdr
->addr1
) &&
1473 mesh_nexthop_resolve(skb
, sdata
)) {
1474 /* skb queued: don't free */
1479 ieee80211_set_qos_hdr(sdata
, skb
);
1480 ieee80211_tx(sdata
, skb
, false);
1484 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1486 struct ieee80211_radiotap_iterator iterator
;
1487 struct ieee80211_radiotap_header
*rthdr
=
1488 (struct ieee80211_radiotap_header
*) skb
->data
;
1489 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1490 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1494 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1495 IEEE80211_TX_CTL_DONTFRAG
;
1498 * for every radiotap entry that is present
1499 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1500 * entries present, or -EINVAL on error)
1504 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1509 /* see if this argument is something we can use */
1510 switch (iterator
.this_arg_index
) {
1512 * You must take care when dereferencing iterator.this_arg
1513 * for multibyte types... the pointer is not aligned. Use
1514 * get_unaligned((type *)iterator.this_arg) to dereference
1515 * iterator.this_arg for type "type" safely on all arches.
1517 case IEEE80211_RADIOTAP_FLAGS
:
1518 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1520 * this indicates that the skb we have been
1521 * handed has the 32-bit FCS CRC at the end...
1522 * we should react to that by snipping it off
1523 * because it will be recomputed and added
1526 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1529 skb_trim(skb
, skb
->len
- FCS_LEN
);
1531 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1532 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1533 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1534 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1537 case IEEE80211_RADIOTAP_TX_FLAGS
:
1538 txflags
= get_unaligned_le16(iterator
.this_arg
);
1539 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1540 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1544 * Please update the file
1545 * Documentation/networking/mac80211-injection.txt
1546 * when parsing new fields here.
1554 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1558 * remove the radiotap header
1559 * iterator->_max_length was sanity-checked against
1560 * skb->len by iterator init
1562 skb_pull(skb
, iterator
._max_length
);
1567 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1568 struct net_device
*dev
)
1570 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1571 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1572 struct ieee80211_radiotap_header
*prthdr
=
1573 (struct ieee80211_radiotap_header
*)skb
->data
;
1574 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1575 struct ieee80211_hdr
*hdr
;
1576 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1581 * Frame injection is not allowed if beaconing is not allowed
1582 * or if we need radar detection. Beaconing is usually not allowed when
1583 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1584 * Passive scan is also used in world regulatory domains where
1585 * your country is not known and as such it should be treated as
1586 * NO TX unless the channel is explicitly allowed in which case
1587 * your current regulatory domain would not have the passive scan
1590 * Since AP mode uses monitor interfaces to inject/TX management
1591 * frames we can make AP mode the exception to this rule once it
1592 * supports radar detection as its implementation can deal with
1593 * radar detection by itself. We can do that later by adding a
1594 * monitor flag interfaces used for AP support.
1596 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1597 IEEE80211_CHAN_PASSIVE_SCAN
)))
1600 /* check for not even having the fixed radiotap header part */
1601 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1602 goto fail
; /* too short to be possibly valid */
1604 /* is it a header version we can trust to find length from? */
1605 if (unlikely(prthdr
->it_version
))
1606 goto fail
; /* only version 0 is supported */
1608 /* then there must be a radiotap header with a length we can use */
1609 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1611 /* does the skb contain enough to deliver on the alleged length? */
1612 if (unlikely(skb
->len
< len_rthdr
))
1613 goto fail
; /* skb too short for claimed rt header extent */
1616 * fix up the pointers accounting for the radiotap
1617 * header still being in there. We are being given
1618 * a precooked IEEE80211 header so no need for
1621 skb_set_mac_header(skb
, len_rthdr
);
1623 * these are just fixed to the end of the rt area since we
1624 * don't have any better information and at this point, nobody cares
1626 skb_set_network_header(skb
, len_rthdr
);
1627 skb_set_transport_header(skb
, len_rthdr
);
1629 if (skb
->len
< len_rthdr
+ 2)
1632 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1633 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1635 if (skb
->len
< len_rthdr
+ hdrlen
)
1639 * Initialize skb->protocol if the injected frame is a data frame
1640 * carrying a rfc1042 header
1642 if (ieee80211_is_data(hdr
->frame_control
) &&
1643 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1644 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1646 if (ether_addr_equal(payload
, rfc1042_header
))
1647 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1651 memset(info
, 0, sizeof(*info
));
1653 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1654 IEEE80211_TX_CTL_INJECTED
;
1656 /* process and remove the injection radiotap header */
1657 if (!ieee80211_parse_tx_radiotap(skb
))
1663 * We process outgoing injected frames that have a local address
1664 * we handle as though they are non-injected frames.
1665 * This code here isn't entirely correct, the local MAC address
1666 * isn't always enough to find the interface to use; for proper
1667 * VLAN/WDS support we will need a different mechanism (which
1668 * likely isn't going to be monitor interfaces).
1670 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1672 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1673 if (!ieee80211_sdata_running(tmp_sdata
))
1675 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1676 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1677 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1679 if (ether_addr_equal(tmp_sdata
->vif
.addr
, hdr
->addr2
)) {
1685 ieee80211_xmit(sdata
, skb
);
1688 return NETDEV_TX_OK
;
1692 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1696 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1697 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1698 * @skb: packet to be sent
1699 * @dev: incoming interface
1701 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1702 * not be freed, and caller is responsible for either retrying later or freeing
1705 * This function takes in an Ethernet header and encapsulates it with suitable
1706 * IEEE 802.11 header based on which interface the packet is coming in. The
1707 * encapsulated packet will then be passed to master interface, wlan#.11, for
1708 * transmission (through low-level driver).
1710 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1711 struct net_device
*dev
)
1713 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1714 struct ieee80211_local
*local
= sdata
->local
;
1715 struct ieee80211_tx_info
*info
;
1716 int ret
= NETDEV_TX_BUSY
, head_need
;
1717 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1719 struct ieee80211_hdr hdr
;
1720 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1721 struct mesh_path __maybe_unused
*mppath
= NULL
, *mpath
= NULL
;
1722 const u8
*encaps_data
;
1723 int encaps_len
, skip_header_bytes
;
1725 struct sta_info
*sta
= NULL
;
1726 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1727 bool tdls_direct
= false;
1732 if (unlikely(skb
->len
< ETH_HLEN
)) {
1737 /* convert Ethernet header to proper 802.11 header (based on
1738 * operation mode) */
1739 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1740 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1742 switch (sdata
->vif
.type
) {
1743 case NL80211_IFTYPE_AP_VLAN
:
1745 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1747 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1749 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1750 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1751 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1752 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1754 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1755 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1761 case NL80211_IFTYPE_AP
:
1762 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1764 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1765 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1766 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1769 case NL80211_IFTYPE_WDS
:
1770 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1772 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1773 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1774 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1775 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1778 #ifdef CONFIG_MAC80211_MESH
1779 case NL80211_IFTYPE_MESH_POINT
:
1780 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1781 /* Do not send frames with mesh_ttl == 0 */
1782 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1787 if (!is_multicast_ether_addr(skb
->data
)) {
1788 mpath
= mesh_path_lookup(skb
->data
, sdata
);
1790 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1794 * Use address extension if it is a packet from
1795 * another interface or if we know the destination
1796 * is being proxied by a portal (i.e. portal address
1797 * differs from proxied address)
1799 if (ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
) &&
1800 !(mppath
&& !ether_addr_equal(mppath
->mpp
, skb
->data
))) {
1801 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1802 skb
->data
, skb
->data
+ ETH_ALEN
);
1804 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1807 int is_mesh_mcast
= 1;
1810 if (is_multicast_ether_addr(skb
->data
))
1811 /* DA TA mSA AE:SA */
1812 mesh_da
= skb
->data
;
1814 static const u8 bcast
[ETH_ALEN
] =
1815 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1817 /* RA TA mDA mSA AE:DA SA */
1818 mesh_da
= mppath
->mpp
;
1821 /* DA TA mSA AE:SA */
1825 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1826 mesh_da
, sdata
->vif
.addr
);
1830 ieee80211_new_mesh_header(&mesh_hdr
,
1832 skb
->data
+ ETH_ALEN
,
1836 ieee80211_new_mesh_header(&mesh_hdr
,
1839 skb
->data
+ ETH_ALEN
);
1844 case NL80211_IFTYPE_STATION
:
1845 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1846 bool tdls_peer
= false;
1849 sta
= sta_info_get(sdata
, skb
->data
);
1851 authorized
= test_sta_flag(sta
,
1852 WLAN_STA_AUTHORIZED
);
1853 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1854 tdls_peer
= test_sta_flag(sta
,
1855 WLAN_STA_TDLS_PEER
);
1856 tdls_auth
= test_sta_flag(sta
,
1857 WLAN_STA_TDLS_PEER_AUTH
);
1862 * If the TDLS link is enabled, send everything
1863 * directly. Otherwise, allow TDLS setup frames
1864 * to be transmitted indirectly.
1866 tdls_direct
= tdls_peer
&& (tdls_auth
||
1867 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1868 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1872 /* link during setup - throw out frames to peer */
1879 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1880 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1881 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1883 } else if (sdata
->u
.mgd
.use_4addr
&&
1884 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1885 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1886 IEEE80211_FCTL_TODS
);
1888 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1889 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1890 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1891 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1894 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1896 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1897 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1898 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1902 case NL80211_IFTYPE_ADHOC
:
1904 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1905 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1906 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1915 * There's no need to try to look up the destination
1916 * if it is a multicast address (which can only happen
1919 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1922 sta
= sta_info_get(sdata
, hdr
.addr1
);
1924 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1925 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1930 /* For mesh, the use of the QoS header is mandatory */
1931 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1934 /* receiver and we are QoS enabled, use a QoS type frame */
1935 if (wme_sta
&& local
->hw
.queues
>= IEEE80211_NUM_ACS
) {
1936 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1941 * Drop unicast frames to unauthorised stations unless they are
1942 * EAPOL frames from the local station.
1944 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1945 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1946 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1947 !ether_addr_equal(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1948 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1949 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1950 dev
->name
, hdr
.addr1
);
1953 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1959 if (unlikely(!multicast
&& skb
->sk
&&
1960 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1961 struct sk_buff
*orig_skb
= skb
;
1963 skb
= skb_clone(skb
, GFP_ATOMIC
);
1965 unsigned long flags
;
1968 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1969 r
= idr_get_new_above(&local
->ack_status_frames
,
1972 idr_pre_get(&local
->ack_status_frames
,
1974 r
= idr_get_new_above(&local
->ack_status_frames
,
1977 if (WARN_ON(!id
) || id
> 0xffff) {
1978 idr_remove(&local
->ack_status_frames
, id
);
1981 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1985 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1986 } else if (skb_shared(skb
)) {
1987 kfree_skb(orig_skb
);
1993 /* couldn't clone -- lose tx status ... */
1999 * If the skb is shared we need to obtain our own copy.
2001 if (skb_shared(skb
)) {
2002 struct sk_buff
*tmp_skb
= skb
;
2004 /* can't happen -- skb is a clone if info_id != 0 */
2007 skb
= skb_clone(skb
, GFP_ATOMIC
);
2016 hdr
.frame_control
= fc
;
2017 hdr
.duration_id
= 0;
2020 skip_header_bytes
= ETH_HLEN
;
2021 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2022 encaps_data
= bridge_tunnel_header
;
2023 encaps_len
= sizeof(bridge_tunnel_header
);
2024 skip_header_bytes
-= 2;
2025 } else if (ethertype
>= 0x600) {
2026 encaps_data
= rfc1042_header
;
2027 encaps_len
= sizeof(rfc1042_header
);
2028 skip_header_bytes
-= 2;
2034 nh_pos
= skb_network_header(skb
) - skb
->data
;
2035 h_pos
= skb_transport_header(skb
) - skb
->data
;
2037 skb_pull(skb
, skip_header_bytes
);
2038 nh_pos
-= skip_header_bytes
;
2039 h_pos
-= skip_header_bytes
;
2041 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2044 * So we need to modify the skb header and hence need a copy of
2045 * that. The head_need variable above doesn't, so far, include
2046 * the needed header space that we don't need right away. If we
2047 * can, then we don't reallocate right now but only after the
2048 * frame arrives at the master device (if it does...)
2050 * If we cannot, however, then we will reallocate to include all
2051 * the ever needed space. Also, if we need to reallocate it anyway,
2052 * make it big enough for everything we may ever need.
2055 if (head_need
> 0 || skb_cloned(skb
)) {
2056 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2057 head_need
+= local
->tx_headroom
;
2058 head_need
= max_t(int, 0, head_need
);
2059 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2064 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2065 nh_pos
+= encaps_len
;
2066 h_pos
+= encaps_len
;
2069 #ifdef CONFIG_MAC80211_MESH
2070 if (meshhdrlen
> 0) {
2071 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2072 nh_pos
+= meshhdrlen
;
2073 h_pos
+= meshhdrlen
;
2077 if (ieee80211_is_data_qos(fc
)) {
2078 __le16
*qos_control
;
2080 qos_control
= (__le16
*) skb_push(skb
, 2);
2081 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2083 * Maybe we could actually set some fields here, for now just
2084 * initialise to zero to indicate no special operation.
2088 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2093 dev
->stats
.tx_packets
++;
2094 dev
->stats
.tx_bytes
+= skb
->len
;
2096 /* Update skb pointers to various headers since this modified frame
2097 * is going to go through Linux networking code that may potentially
2098 * need things like pointer to IP header. */
2099 skb_set_mac_header(skb
, 0);
2100 skb_set_network_header(skb
, nh_pos
);
2101 skb_set_transport_header(skb
, h_pos
);
2103 info
= IEEE80211_SKB_CB(skb
);
2104 memset(info
, 0, sizeof(*info
));
2106 dev
->trans_start
= jiffies
;
2108 info
->flags
= info_flags
;
2109 info
->ack_frame_id
= info_id
;
2111 ieee80211_xmit(sdata
, skb
);
2113 return NETDEV_TX_OK
;
2116 if (ret
== NETDEV_TX_OK
)
2124 * ieee80211_clear_tx_pending may not be called in a context where
2125 * it is possible that it packets could come in again.
2127 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2131 for (i
= 0; i
< local
->hw
.queues
; i
++)
2132 skb_queue_purge(&local
->pending
[i
]);
2136 * Returns false if the frame couldn't be transmitted but was queued instead,
2137 * which in this case means re-queued -- take as an indication to stop sending
2138 * more pending frames.
2140 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2141 struct sk_buff
*skb
)
2143 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2144 struct ieee80211_sub_if_data
*sdata
;
2145 struct sta_info
*sta
;
2146 struct ieee80211_hdr
*hdr
;
2149 sdata
= vif_to_sdata(info
->control
.vif
);
2151 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2152 result
= ieee80211_tx(sdata
, skb
, true);
2154 struct sk_buff_head skbs
;
2156 __skb_queue_head_init(&skbs
);
2157 __skb_queue_tail(&skbs
, skb
);
2159 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2160 sta
= sta_info_get(sdata
, hdr
->addr1
);
2162 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2169 * Transmit all pending packets. Called from tasklet.
2171 void ieee80211_tx_pending(unsigned long data
)
2173 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2174 unsigned long flags
;
2180 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2181 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2183 * If queue is stopped by something other than due to pending
2184 * frames, or we have no pending frames, proceed to next queue.
2186 if (local
->queue_stop_reasons
[i
] ||
2187 skb_queue_empty(&local
->pending
[i
]))
2190 while (!skb_queue_empty(&local
->pending
[i
])) {
2191 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2192 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2194 if (WARN_ON(!info
->control
.vif
)) {
2199 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2202 txok
= ieee80211_tx_pending_skb(local
, skb
);
2203 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2209 if (skb_queue_empty(&local
->pending
[i
]))
2210 ieee80211_propagate_queue_wake(local
, i
);
2212 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2217 /* functions for drivers to get certain frames */
2219 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2220 struct ieee80211_if_ap
*bss
,
2221 struct sk_buff
*skb
,
2222 struct beacon_data
*beacon
)
2226 int i
, have_bits
= 0, n1
, n2
;
2228 /* Generate bitmap for TIM only if there are any STAs in power save
2230 if (atomic_read(&bss
->num_sta_ps
) > 0)
2231 /* in the hope that this is faster than
2232 * checking byte-for-byte */
2233 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2234 IEEE80211_MAX_AID
+1);
2236 if (bss
->dtim_count
== 0)
2237 bss
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2241 tim
= pos
= (u8
*) skb_put(skb
, 6);
2242 *pos
++ = WLAN_EID_TIM
;
2244 *pos
++ = bss
->dtim_count
;
2245 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2247 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2250 bss
->dtim_bc_mc
= aid0
== 1;
2253 /* Find largest even number N1 so that bits numbered 1 through
2254 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2255 * (N2 + 1) x 8 through 2007 are 0. */
2257 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2264 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2271 /* Bitmap control */
2273 /* Part Virt Bitmap */
2274 skb_put(skb
, n2
- n1
);
2275 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2277 tim
[1] = n2
- n1
+ 4;
2279 *pos
++ = aid0
; /* Bitmap control */
2280 *pos
++ = 0; /* Part Virt Bitmap */
2284 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2285 struct ieee80211_vif
*vif
,
2286 u16
*tim_offset
, u16
*tim_length
)
2288 struct ieee80211_local
*local
= hw_to_local(hw
);
2289 struct sk_buff
*skb
= NULL
;
2290 struct ieee80211_tx_info
*info
;
2291 struct ieee80211_sub_if_data
*sdata
= NULL
;
2292 struct ieee80211_if_ap
*ap
= NULL
;
2293 struct beacon_data
*beacon
;
2294 struct ieee80211_supported_band
*sband
;
2295 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2296 struct ieee80211_tx_rate_control txrc
;
2298 sband
= local
->hw
.wiphy
->bands
[band
];
2302 sdata
= vif_to_sdata(vif
);
2304 if (!ieee80211_sdata_running(sdata
))
2312 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2314 beacon
= rcu_dereference(ap
->beacon
);
2317 * headroom, head length,
2318 * tail length and maximum TIM length
2320 skb
= dev_alloc_skb(local
->tx_headroom
+
2322 beacon
->tail_len
+ 256);
2326 skb_reserve(skb
, local
->tx_headroom
);
2327 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2331 * Not very nice, but we want to allow the driver to call
2332 * ieee80211_beacon_get() as a response to the set_tim()
2333 * callback. That, however, is already invoked under the
2334 * sta_lock to guarantee consistent and race-free update
2335 * of the tim bitmap in mac80211 and the driver.
2337 if (local
->tim_in_locked_section
) {
2338 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2341 unsigned long flags
;
2343 spin_lock_irqsave(&local
->tim_lock
, flags
);
2344 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2346 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
2350 *tim_offset
= beacon
->head_len
;
2352 *tim_length
= skb
->len
- beacon
->head_len
;
2355 memcpy(skb_put(skb
, beacon
->tail_len
),
2356 beacon
->tail
, beacon
->tail_len
);
2359 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2360 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2361 struct ieee80211_hdr
*hdr
;
2362 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2367 skb
= skb_copy(presp
, GFP_ATOMIC
);
2371 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2372 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2373 IEEE80211_STYPE_BEACON
);
2374 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2375 struct ieee80211_mgmt
*mgmt
;
2376 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2378 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2379 sizeof(mgmt
->u
.beacon
);
2381 #ifdef CONFIG_MAC80211_MESH
2382 if (!sdata
->u
.mesh
.mesh_id_len
)
2386 if (ifmsh
->sync_ops
)
2387 ifmsh
->sync_ops
->adjust_tbtt(
2390 skb
= dev_alloc_skb(local
->tx_headroom
+
2393 2 + 8 + /* supported rates */
2394 2 + 3 + /* DS params */
2395 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2396 2 + sizeof(struct ieee80211_ht_cap
) +
2397 2 + sizeof(struct ieee80211_ht_operation
) +
2398 2 + sdata
->u
.mesh
.mesh_id_len
+
2399 2 + sizeof(struct ieee80211_meshconf_ie
) +
2400 sdata
->u
.mesh
.ie_len
);
2404 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2405 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2406 memset(mgmt
, 0, hdr_len
);
2407 mgmt
->frame_control
=
2408 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2409 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2410 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2411 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2412 mgmt
->u
.beacon
.beacon_int
=
2413 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2414 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2415 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2417 pos
= skb_put(skb
, 2);
2418 *pos
++ = WLAN_EID_SSID
;
2421 if (ieee80211_add_srates_ie(sdata
, skb
, true) ||
2422 mesh_add_ds_params_ie(skb
, sdata
) ||
2423 ieee80211_add_ext_srates_ie(sdata
, skb
, true) ||
2424 mesh_add_rsn_ie(skb
, sdata
) ||
2425 mesh_add_ht_cap_ie(skb
, sdata
) ||
2426 mesh_add_ht_oper_ie(skb
, sdata
) ||
2427 mesh_add_meshid_ie(skb
, sdata
) ||
2428 mesh_add_meshconf_ie(skb
, sdata
) ||
2429 mesh_add_vendor_ies(skb
, sdata
)) {
2430 pr_err("o11s: couldn't add ies!\n");
2438 info
= IEEE80211_SKB_CB(skb
);
2440 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2441 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2444 memset(&txrc
, 0, sizeof(txrc
));
2447 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2449 txrc
.reported_rate
.idx
= -1;
2450 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2451 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2452 txrc
.max_rate_idx
= -1;
2454 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2455 memcpy(txrc
.rate_idx_mcs_mask
, sdata
->rc_rateidx_mcs_mask
[band
],
2456 sizeof(txrc
.rate_idx_mcs_mask
));
2458 rate_control_get_rate(sdata
, NULL
, &txrc
);
2460 info
->control
.vif
= vif
;
2462 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2463 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2464 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2469 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2471 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2472 struct ieee80211_vif
*vif
)
2474 struct ieee80211_if_ap
*ap
= NULL
;
2475 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2476 struct ieee80211_hdr
*hdr
;
2477 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2479 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2485 presp
= rcu_dereference(ap
->probe_resp
);
2489 skb
= skb_copy(presp
, GFP_ATOMIC
);
2493 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2494 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2500 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2502 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2503 struct ieee80211_vif
*vif
)
2505 struct ieee80211_sub_if_data
*sdata
;
2506 struct ieee80211_if_managed
*ifmgd
;
2507 struct ieee80211_pspoll
*pspoll
;
2508 struct ieee80211_local
*local
;
2509 struct sk_buff
*skb
;
2511 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2514 sdata
= vif_to_sdata(vif
);
2515 ifmgd
= &sdata
->u
.mgd
;
2516 local
= sdata
->local
;
2518 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2522 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2524 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2525 memset(pspoll
, 0, sizeof(*pspoll
));
2526 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2527 IEEE80211_STYPE_PSPOLL
);
2528 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2530 /* aid in PS-Poll has its two MSBs each set to 1 */
2531 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2533 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2534 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2538 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2540 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2541 struct ieee80211_vif
*vif
)
2543 struct ieee80211_hdr_3addr
*nullfunc
;
2544 struct ieee80211_sub_if_data
*sdata
;
2545 struct ieee80211_if_managed
*ifmgd
;
2546 struct ieee80211_local
*local
;
2547 struct sk_buff
*skb
;
2549 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2552 sdata
= vif_to_sdata(vif
);
2553 ifmgd
= &sdata
->u
.mgd
;
2554 local
= sdata
->local
;
2556 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2560 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2562 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2564 memset(nullfunc
, 0, sizeof(*nullfunc
));
2565 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2566 IEEE80211_STYPE_NULLFUNC
|
2567 IEEE80211_FCTL_TODS
);
2568 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2569 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2570 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2574 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2576 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2577 struct ieee80211_vif
*vif
,
2578 const u8
*ssid
, size_t ssid_len
,
2579 const u8
*ie
, size_t ie_len
)
2581 struct ieee80211_sub_if_data
*sdata
;
2582 struct ieee80211_local
*local
;
2583 struct ieee80211_hdr_3addr
*hdr
;
2584 struct sk_buff
*skb
;
2588 sdata
= vif_to_sdata(vif
);
2589 local
= sdata
->local
;
2590 ie_ssid_len
= 2 + ssid_len
;
2592 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2593 ie_ssid_len
+ ie_len
);
2597 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2599 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2600 memset(hdr
, 0, sizeof(*hdr
));
2601 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2602 IEEE80211_STYPE_PROBE_REQ
);
2603 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2604 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2605 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2607 pos
= skb_put(skb
, ie_ssid_len
);
2608 *pos
++ = WLAN_EID_SSID
;
2611 memcpy(pos
, ssid
, ssid_len
);
2615 pos
= skb_put(skb
, ie_len
);
2616 memcpy(pos
, ie
, ie_len
);
2621 EXPORT_SYMBOL(ieee80211_probereq_get
);
2623 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2624 const void *frame
, size_t frame_len
,
2625 const struct ieee80211_tx_info
*frame_txctl
,
2626 struct ieee80211_rts
*rts
)
2628 const struct ieee80211_hdr
*hdr
= frame
;
2630 rts
->frame_control
=
2631 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2632 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2634 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2635 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2637 EXPORT_SYMBOL(ieee80211_rts_get
);
2639 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2640 const void *frame
, size_t frame_len
,
2641 const struct ieee80211_tx_info
*frame_txctl
,
2642 struct ieee80211_cts
*cts
)
2644 const struct ieee80211_hdr
*hdr
= frame
;
2646 cts
->frame_control
=
2647 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2648 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2649 frame_len
, frame_txctl
);
2650 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2652 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2655 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2656 struct ieee80211_vif
*vif
)
2658 struct ieee80211_local
*local
= hw_to_local(hw
);
2659 struct sk_buff
*skb
= NULL
;
2660 struct ieee80211_tx_data tx
;
2661 struct ieee80211_sub_if_data
*sdata
;
2662 struct ieee80211_if_ap
*bss
= NULL
;
2663 struct beacon_data
*beacon
;
2664 struct ieee80211_tx_info
*info
;
2666 sdata
= vif_to_sdata(vif
);
2670 beacon
= rcu_dereference(bss
->beacon
);
2672 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2675 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2676 goto out
; /* send buffered bc/mc only after DTIM beacon */
2679 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2682 local
->total_ps_buffered
--;
2684 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2685 struct ieee80211_hdr
*hdr
=
2686 (struct ieee80211_hdr
*) skb
->data
;
2687 /* more buffered multicast/broadcast frames ==> set
2688 * MoreData flag in IEEE 802.11 header to inform PS
2690 hdr
->frame_control
|=
2691 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2694 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2696 dev_kfree_skb_any(skb
);
2699 info
= IEEE80211_SKB_CB(skb
);
2701 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2702 tx
.channel
= local
->hw
.conf
.channel
;
2703 info
->band
= tx
.channel
->band
;
2705 if (invoke_tx_handlers(&tx
))
2712 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2714 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data
*sdata
,
2715 struct sk_buff
*skb
, int tid
)
2717 int ac
= ieee802_1d_to_ac
[tid
];
2719 skb_set_mac_header(skb
, 0);
2720 skb_set_network_header(skb
, 0);
2721 skb_set_transport_header(skb
, 0);
2723 skb_set_queue_mapping(skb
, ac
);
2724 skb
->priority
= tid
;
2727 * The other path calling ieee80211_xmit is from the tasklet,
2728 * and while we can handle concurrent transmissions locking
2729 * requirements are that we do not come into tx with bhs on.
2732 ieee80211_xmit(sdata
, skb
);