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 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr
->frame_control
) &&
156 *(ieee80211_get_qos_ctl(hdr
)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK
)
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
163 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur
*= 2; /* ACK + SIFS */
170 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
171 txrate
->bitrate
, erp
,
172 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
175 return cpu_to_le16(dur
);
178 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
179 struct net_device
*dev
)
181 return local
== wdev_priv(dev
->ieee80211_ptr
);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
188 struct ieee80211_local
*local
= tx
->local
;
189 struct ieee80211_if_managed
*ifmgd
;
191 /* driver doesn't support power save */
192 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
195 /* hardware does dynamic power save */
196 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
199 /* dynamic power save disabled */
200 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
203 /* we are scanning, don't enable power save */
207 if (!local
->ps_sdata
)
210 /* No point if we're going to suspend */
211 if (local
->quiescing
)
214 /* dynamic ps is supported only in managed mode */
215 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
218 ifmgd
= &tx
->sdata
->u
.mgd
;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: ifmgd->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
234 && (ifmgd
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
235 && skb_get_queue_mapping(tx
->skb
) == 0)
238 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
239 ieee80211_stop_queues_by_reason(&local
->hw
,
240 IEEE80211_QUEUE_STOP_REASON_PS
);
241 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
242 ieee80211_queue_work(&local
->hw
,
243 &local
->dynamic_ps_disable_work
);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd
->associated
)
250 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
251 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
260 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
261 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
264 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
267 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
269 !ieee80211_is_probe_req(hdr
->frame_control
) &&
270 !ieee80211_is_nullfunc(hdr
->frame_control
))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
287 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
290 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
294 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
296 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
297 if (unlikely(!assoc
&&
298 ieee80211_is_data(hdr
->frame_control
))) {
299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 printk(KERN_DEBUG
"%s: dropped data frame to not "
301 "associated station %pM\n",
302 tx
->sdata
->name
, hdr
->addr1
);
303 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
304 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
307 } else if (unlikely(tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
308 ieee80211_is_data(hdr
->frame_control
) &&
309 !atomic_read(&tx
->sdata
->u
.ap
.num_sta_authorized
))) {
311 * 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
;
454 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
455 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
456 !(info
->flags
& IEEE80211_TX_CTL_NO_PS_BUFFER
))) {
457 int ac
= skb_get_queue_mapping(tx
->skb
);
459 /* only deauth, disassoc and action are bufferable MMPDUs */
460 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
461 !ieee80211_is_deauth(hdr
->frame_control
) &&
462 !ieee80211_is_disassoc(hdr
->frame_control
) &&
463 !ieee80211_is_action(hdr
->frame_control
)) {
464 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
468 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
469 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer for AC %d\n",
470 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
471 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
472 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
473 purge_old_ps_buffers(tx
->local
);
474 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
475 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
476 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
478 printk(KERN_DEBUG
"%s: STA %pM TX buffer for "
479 "AC %d full - dropping oldest frame\n",
480 tx
->sdata
->name
, sta
->sta
.addr
, ac
);
484 tx
->local
->total_ps_buffered
++;
486 info
->control
.jiffies
= jiffies
;
487 info
->control
.vif
= &tx
->sdata
->vif
;
488 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
489 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
491 if (!timer_pending(&local
->sta_cleanup
))
492 mod_timer(&local
->sta_cleanup
,
493 round_jiffies(jiffies
+
494 STA_INFO_CLEANUP_INTERVAL
));
497 * We queued up some frames, so the TIM bit might
498 * need to be set, recalculate it.
500 sta_info_recalc_tim(sta
);
504 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
505 else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
507 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
508 tx
->sdata
->name
, sta
->sta
.addr
);
510 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
515 static ieee80211_tx_result debug_noinline
516 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
518 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
521 if (tx
->flags
& IEEE80211_TX_UNICAST
)
522 return ieee80211_tx_h_unicast_ps_buf(tx
);
524 return ieee80211_tx_h_multicast_ps_buf(tx
);
527 static ieee80211_tx_result debug_noinline
528 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
530 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
532 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
533 tx
->sdata
->control_port_no_encrypt
))
534 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
539 static ieee80211_tx_result debug_noinline
540 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
542 struct ieee80211_key
*key
= NULL
;
543 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
544 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
546 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
548 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
550 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
551 is_multicast_ether_addr(hdr
->addr1
) &&
552 ieee80211_is_robust_mgmt_frame(hdr
) &&
553 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
555 else if (is_multicast_ether_addr(hdr
->addr1
) &&
556 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
558 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
559 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
561 else if (tx
->sdata
->drop_unencrypted
&&
562 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
563 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
564 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
565 (ieee80211_is_action(hdr
->frame_control
) &&
566 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
567 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
573 bool skip_hw
= false;
575 tx
->key
->tx_rx_count
++;
576 /* TODO: add threshold stuff again */
578 switch (tx
->key
->conf
.cipher
) {
579 case WLAN_CIPHER_SUITE_WEP40
:
580 case WLAN_CIPHER_SUITE_WEP104
:
581 case WLAN_CIPHER_SUITE_TKIP
:
582 if (!ieee80211_is_data_present(hdr
->frame_control
))
585 case WLAN_CIPHER_SUITE_CCMP
:
586 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
587 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
591 skip_hw
= (tx
->key
->conf
.flags
&
592 IEEE80211_KEY_FLAG_SW_MGMT
) &&
593 ieee80211_is_mgmt(hdr
->frame_control
);
595 case WLAN_CIPHER_SUITE_AES_CMAC
:
596 if (!ieee80211_is_mgmt(hdr
->frame_control
))
601 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
604 if (!skip_hw
&& tx
->key
&&
605 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
606 info
->control
.hw_key
= &tx
->key
->conf
;
612 static ieee80211_tx_result debug_noinline
613 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
615 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
616 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
617 struct ieee80211_supported_band
*sband
;
618 struct ieee80211_rate
*rate
;
621 bool inval
= false, rts
= false, short_preamble
= false;
622 struct ieee80211_tx_rate_control txrc
;
625 memset(&txrc
, 0, sizeof(txrc
));
627 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
629 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
630 tx
->local
->hw
.wiphy
->frag_threshold
);
632 /* set up the tx rate control struct we give the RC algo */
633 txrc
.hw
= &tx
->local
->hw
;
635 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
637 txrc
.reported_rate
.idx
= -1;
638 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
639 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
640 txrc
.max_rate_idx
= -1;
642 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
643 memcpy(txrc
.rate_idx_mcs_mask
,
644 tx
->sdata
->rc_rateidx_mcs_mask
[tx
->channel
->band
],
645 sizeof(txrc
.rate_idx_mcs_mask
));
646 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
647 tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
||
648 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
650 /* set up RTS protection if desired */
651 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
652 txrc
.rts
= rts
= true;
656 * Use short preamble if the BSS can handle it, but not for
657 * management frames unless we know the receiver can handle
658 * that -- the management frame might be to a station that
659 * just wants a probe response.
661 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
662 (ieee80211_is_data(hdr
->frame_control
) ||
663 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
664 txrc
.short_preamble
= short_preamble
= true;
667 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
670 * Lets not bother rate control if we're associated and cannot
671 * talk to the sta. This should not happen.
673 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
674 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
675 "%s: Dropped data frame as no usable bitrate found while "
676 "scanning and associated. Target station: "
677 "%pM on %d GHz band\n",
678 tx
->sdata
->name
, hdr
->addr1
,
679 tx
->channel
->band
? 5 : 2))
683 * If we're associated with the sta at this point we know we can at
684 * least send the frame at the lowest bit rate.
686 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
688 if (unlikely(info
->control
.rates
[0].idx
< 0))
691 if (txrc
.reported_rate
.idx
< 0) {
692 txrc
.reported_rate
= info
->control
.rates
[0];
693 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
694 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
696 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
698 if (unlikely(!info
->control
.rates
[0].count
))
699 info
->control
.rates
[0].count
= 1;
701 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
702 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
703 info
->control
.rates
[0].count
= 1;
705 if (is_multicast_ether_addr(hdr
->addr1
)) {
707 * XXX: verify the rate is in the basic rateset
713 * set up the RTS/CTS rate as the fastest basic rate
714 * that is not faster than the data rate
716 * XXX: Should this check all retry rates?
718 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
721 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
723 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
724 /* must be a basic rate */
725 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
727 /* must not be faster than the data rate */
728 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
731 if (sband
->bitrates
[baserate
].bitrate
<
732 sband
->bitrates
[i
].bitrate
)
736 info
->control
.rts_cts_rate_idx
= baserate
;
739 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
741 * make sure there's no valid rate following
742 * an invalid one, just in case drivers don't
743 * take the API seriously to stop at -1.
746 info
->control
.rates
[i
].idx
= -1;
749 if (info
->control
.rates
[i
].idx
< 0) {
755 * For now assume MCS is already set up correctly, this
758 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
759 WARN_ON(info
->control
.rates
[i
].idx
> 76);
763 /* set up RTS protection if desired */
765 info
->control
.rates
[i
].flags
|=
766 IEEE80211_TX_RC_USE_RTS_CTS
;
769 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
770 sband
->n_bitrates
)) {
771 info
->control
.rates
[i
].idx
= -1;
775 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
777 /* set up short preamble */
778 if (short_preamble
&&
779 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
780 info
->control
.rates
[i
].flags
|=
781 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
783 /* set up G protection */
784 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
785 rate
->flags
& IEEE80211_RATE_ERP_G
)
786 info
->control
.rates
[i
].flags
|=
787 IEEE80211_TX_RC_USE_CTS_PROTECT
;
793 static ieee80211_tx_result debug_noinline
794 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
796 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
797 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
803 * Packet injection may want to control the sequence
804 * number, if we have no matching interface then we
805 * neither assign one ourselves nor ask the driver to.
807 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
810 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
813 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
816 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
820 * Anything but QoS data that has a sequence number field
821 * (is long enough) gets a sequence number from the global
824 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
825 /* driver should assign sequence number */
826 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
827 /* for pure STA mode without beacons, we can do it */
828 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
829 tx
->sdata
->sequence_number
+= 0x10;
834 * This should be true for injected/management frames only, for
835 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
836 * above since they are not QoS-data frames.
841 /* include per-STA, per-TID sequence counter */
843 qc
= ieee80211_get_qos_ctl(hdr
);
844 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
845 seq
= &tx
->sta
->tid_seq
[tid
];
847 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
849 /* Increase the sequence number. */
850 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
855 static int ieee80211_fragment(struct ieee80211_tx_data
*tx
,
856 struct sk_buff
*skb
, int hdrlen
,
859 struct ieee80211_local
*local
= tx
->local
;
860 struct ieee80211_tx_info
*info
;
862 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
863 int pos
= hdrlen
+ per_fragm
;
864 int rem
= skb
->len
- hdrlen
- per_fragm
;
866 if (WARN_ON(rem
< 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen
= per_fragm
;
877 tmp
= dev_alloc_skb(local
->tx_headroom
+
879 IEEE80211_ENCRYPT_HEADROOM
+
880 IEEE80211_ENCRYPT_TAILROOM
);
884 __skb_queue_tail(&tx
->skbs
, tmp
);
886 skb_reserve(tmp
, local
->tx_headroom
+
887 IEEE80211_ENCRYPT_HEADROOM
);
888 /* copy control information */
889 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
891 info
= IEEE80211_SKB_CB(tmp
);
892 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
893 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
896 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
898 skb_copy_queue_mapping(tmp
, skb
);
899 tmp
->priority
= skb
->priority
;
902 /* copy header and data */
903 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
904 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
909 /* adjust first fragment's length */
910 skb
->len
= hdrlen
+ per_fragm
;
914 static ieee80211_tx_result debug_noinline
915 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
917 struct sk_buff
*skb
= tx
->skb
;
918 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
919 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
920 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
924 /* no matter what happens, tx->skb moves to tx->skbs */
925 __skb_queue_tail(&tx
->skbs
, skb
);
928 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
931 if (tx
->local
->ops
->set_frag_threshold
)
935 * Warn when submitting a fragmented A-MPDU frame and drop it.
936 * This scenario is handled in ieee80211_tx_prepare but extra
937 * caution taken here as fragmented ampdu may cause Tx stop.
939 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
942 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
944 /* internal error, why isn't DONTFRAG set? */
945 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
949 * Now fragment the frame. This will allocate all the fragments and
950 * chain them (using skb as the first fragment) to skb->next.
951 * During transmission, we will remove the successfully transmitted
952 * fragments from this list. When the low-level driver rejects one
953 * of the fragments then we will simply pretend to accept the skb
954 * but store it away as pending.
956 if (ieee80211_fragment(tx
, skb
, hdrlen
, frag_threshold
))
959 /* update duration/seq/flags of fragments */
962 skb_queue_walk(&tx
->skbs
, skb
) {
964 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
966 hdr
= (void *)skb
->data
;
967 info
= IEEE80211_SKB_CB(skb
);
969 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
970 hdr
->frame_control
|= morefrags
;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info
->control
.rates
[1].idx
= -1;
976 info
->control
.rates
[2].idx
= -1;
977 info
->control
.rates
[3].idx
= -1;
978 info
->control
.rates
[4].idx
= -1;
979 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
980 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
982 hdr
->frame_control
&= ~morefrags
;
985 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
1000 tx
->sta
->tx_packets
++;
1001 skb_queue_walk(&tx
->skbs
, skb
) {
1002 tx
->sta
->tx_fragments
++;
1003 tx
->sta
->tx_bytes
+= skb
->len
;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
1015 switch (tx
->key
->conf
.cipher
) {
1016 case WLAN_CIPHER_SUITE_WEP40
:
1017 case WLAN_CIPHER_SUITE_WEP104
:
1018 return ieee80211_crypto_wep_encrypt(tx
);
1019 case WLAN_CIPHER_SUITE_TKIP
:
1020 return ieee80211_crypto_tkip_encrypt(tx
);
1021 case WLAN_CIPHER_SUITE_CCMP
:
1022 return ieee80211_crypto_ccmp_encrypt(tx
);
1023 case WLAN_CIPHER_SUITE_AES_CMAC
:
1024 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1026 return ieee80211_crypto_hw_encrypt(tx
);
1032 static ieee80211_tx_result debug_noinline
1033 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1035 struct sk_buff
*skb
;
1036 struct ieee80211_hdr
*hdr
;
1040 skb_queue_walk(&tx
->skbs
, skb
) {
1041 hdr
= (void *) skb
->data
;
1042 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1043 break; /* must not overwrite AID */
1044 if (!skb_queue_is_last(&tx
->skbs
, skb
)) {
1045 struct sk_buff
*next
= skb_queue_next(&tx
->skbs
, skb
);
1046 next_len
= next
->len
;
1049 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1052 ieee80211_duration(tx
, skb
, group_addr
, next_len
);
1058 /* actual transmit path */
1060 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1061 struct sk_buff
*skb
,
1062 struct ieee80211_tx_info
*info
,
1063 struct tid_ampdu_tx
*tid_tx
,
1066 bool queued
= false;
1067 bool reset_agg_timer
= false;
1068 struct sk_buff
*purge_skb
= NULL
;
1070 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1071 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1072 reset_agg_timer
= true;
1073 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1075 * nothing -- this aggregation session is being started
1076 * but that might still fail with the driver
1079 spin_lock(&tx
->sta
->lock
);
1081 * Need to re-check now, because we may get here
1083 * 1) in the window during which the setup is actually
1084 * already done, but not marked yet because not all
1085 * packets are spliced over to the driver pending
1086 * queue yet -- if this happened we acquire the lock
1087 * either before or after the splice happens, but
1088 * need to recheck which of these cases happened.
1090 * 2) during session teardown, if the OPERATIONAL bit
1091 * was cleared due to the teardown but the pointer
1092 * hasn't been assigned NULL yet (or we loaded it
1093 * before it was assigned) -- in this case it may
1094 * now be NULL which means we should just let the
1095 * packet pass through because splicing the frames
1096 * back is already done.
1098 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1101 /* do nothing, let packet pass through */
1102 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1103 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1104 reset_agg_timer
= true;
1107 info
->control
.vif
= &tx
->sdata
->vif
;
1108 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1109 __skb_queue_tail(&tid_tx
->pending
, skb
);
1110 if (skb_queue_len(&tid_tx
->pending
) > STA_MAX_TX_BUFFER
)
1111 purge_skb
= __skb_dequeue(&tid_tx
->pending
);
1113 spin_unlock(&tx
->sta
->lock
);
1116 dev_kfree_skb(purge_skb
);
1119 /* reset session timer */
1120 if (reset_agg_timer
&& tid_tx
->timeout
)
1121 mod_timer(&tid_tx
->session_timer
,
1122 TU_TO_EXP_TIME(tid_tx
->timeout
));
1130 static ieee80211_tx_result
1131 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1132 struct ieee80211_tx_data
*tx
,
1133 struct sk_buff
*skb
)
1135 struct ieee80211_local
*local
= sdata
->local
;
1136 struct ieee80211_hdr
*hdr
;
1137 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1141 memset(tx
, 0, sizeof(*tx
));
1145 tx
->channel
= local
->hw
.conf
.channel
;
1146 __skb_queue_head_init(&tx
->skbs
);
1149 * If this flag is set to true anywhere, and we get here,
1150 * we are doing the needed processing, so remove the flag
1153 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1155 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1157 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1158 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1159 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1161 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1162 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1165 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1167 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1168 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1169 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1170 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1171 struct tid_ampdu_tx
*tid_tx
;
1173 qc
= ieee80211_get_qos_ctl(hdr
);
1174 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1176 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1180 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1183 if (unlikely(queued
))
1188 if (is_multicast_ether_addr(hdr
->addr1
)) {
1189 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1190 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1192 tx
->flags
|= IEEE80211_TX_UNICAST
;
1194 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1195 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1196 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1197 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1198 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1202 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1203 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1204 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1206 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1211 static bool ieee80211_tx_frags(struct ieee80211_local
*local
,
1212 struct ieee80211_vif
*vif
,
1213 struct ieee80211_sta
*sta
,
1214 struct sk_buff_head
*skbs
,
1217 struct sk_buff
*skb
, *tmp
;
1218 struct ieee80211_tx_info
*info
;
1219 unsigned long flags
;
1221 skb_queue_walk_safe(skbs
, skb
, tmp
) {
1222 int q
= skb_get_queue_mapping(skb
);
1224 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1225 if (local
->queue_stop_reasons
[q
] ||
1226 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1228 * Since queue is stopped, queue up frames for later
1229 * transmission from the tx-pending tasklet when the
1230 * queue is woken again.
1233 skb_queue_splice_init(skbs
, &local
->pending
[q
]);
1235 skb_queue_splice_tail_init(skbs
,
1236 &local
->pending
[q
]);
1238 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1242 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1244 info
= IEEE80211_SKB_CB(skb
);
1245 info
->control
.vif
= vif
;
1246 info
->control
.sta
= sta
;
1248 __skb_unlink(skb
, skbs
);
1256 * Returns false if the frame couldn't be transmitted but was queued instead.
1258 static bool __ieee80211_tx(struct ieee80211_local
*local
,
1259 struct sk_buff_head
*skbs
, int led_len
,
1260 struct sta_info
*sta
, bool txpending
)
1262 struct ieee80211_tx_info
*info
;
1263 struct ieee80211_sub_if_data
*sdata
;
1264 struct ieee80211_vif
*vif
;
1265 struct ieee80211_sta
*pubsta
;
1266 struct sk_buff
*skb
;
1270 if (WARN_ON(skb_queue_empty(skbs
)))
1273 skb
= skb_peek(skbs
);
1274 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1275 info
= IEEE80211_SKB_CB(skb
);
1276 sdata
= vif_to_sdata(info
->control
.vif
);
1277 if (sta
&& !sta
->uploaded
)
1285 switch (sdata
->vif
.type
) {
1286 case NL80211_IFTYPE_MONITOR
:
1290 case NL80211_IFTYPE_AP_VLAN
:
1291 sdata
= container_of(sdata
->bss
,
1292 struct ieee80211_sub_if_data
, u
.ap
);
1299 if (local
->ops
->tx_frags
)
1300 drv_tx_frags(local
, vif
, pubsta
, skbs
);
1302 result
= ieee80211_tx_frags(local
, vif
, pubsta
, skbs
,
1305 ieee80211_tpt_led_trig_tx(local
, fc
, led_len
);
1306 ieee80211_led_tx(local
, 1);
1308 WARN_ON_ONCE(!skb_queue_empty(skbs
));
1314 * Invoke TX handlers, return 0 on success and non-zero if the
1315 * frame was dropped or queued.
1317 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1319 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
1320 ieee80211_tx_result res
= TX_DROP
;
1322 #define CALL_TXH(txh) \
1325 if (res != TX_CONTINUE) \
1329 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1330 CALL_TXH(ieee80211_tx_h_check_assoc
);
1331 CALL_TXH(ieee80211_tx_h_ps_buf
);
1332 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1333 CALL_TXH(ieee80211_tx_h_select_key
);
1334 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1335 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1337 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
)) {
1338 __skb_queue_tail(&tx
->skbs
, tx
->skb
);
1343 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1344 CALL_TXH(ieee80211_tx_h_sequence
);
1345 CALL_TXH(ieee80211_tx_h_fragment
);
1346 /* handlers after fragment must be aware of tx info fragmentation! */
1347 CALL_TXH(ieee80211_tx_h_stats
);
1348 CALL_TXH(ieee80211_tx_h_encrypt
);
1349 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1350 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1354 if (unlikely(res
== TX_DROP
)) {
1355 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1357 dev_kfree_skb(tx
->skb
);
1359 __skb_queue_purge(&tx
->skbs
);
1361 } else if (unlikely(res
== TX_QUEUED
)) {
1362 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1370 * Returns false if the frame couldn't be transmitted but was queued instead.
1372 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1373 struct sk_buff
*skb
, bool txpending
)
1375 struct ieee80211_local
*local
= sdata
->local
;
1376 struct ieee80211_tx_data tx
;
1377 ieee80211_tx_result res_prepare
;
1378 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1382 if (unlikely(skb
->len
< 10)) {
1389 /* initialises tx */
1391 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1393 if (unlikely(res_prepare
== TX_DROP
)) {
1396 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1400 tx
.channel
= local
->hw
.conf
.channel
;
1401 info
->band
= tx
.channel
->band
;
1403 if (!invoke_tx_handlers(&tx
))
1404 result
= __ieee80211_tx(local
, &tx
.skbs
, led_len
,
1411 /* device xmit handlers */
1413 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1414 struct sk_buff
*skb
,
1415 int head_need
, bool may_encrypt
)
1417 struct ieee80211_local
*local
= sdata
->local
;
1420 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1421 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1422 tail_need
-= skb_tailroom(skb
);
1423 tail_need
= max_t(int, tail_need
, 0);
1426 if (skb_cloned(skb
))
1427 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1428 else if (head_need
|| tail_need
)
1429 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1433 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1434 wiphy_debug(local
->hw
.wiphy
,
1435 "failed to reallocate TX buffer\n");
1442 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1444 struct ieee80211_local
*local
= sdata
->local
;
1445 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1446 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1452 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1454 headroom
= local
->tx_headroom
;
1456 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1457 headroom
-= skb_headroom(skb
);
1458 headroom
= max_t(int, 0, headroom
);
1460 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1466 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1467 info
->control
.vif
= &sdata
->vif
;
1469 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1470 ieee80211_is_data(hdr
->frame_control
) &&
1471 !is_multicast_ether_addr(hdr
->addr1
))
1472 if (mesh_nexthop_resolve(skb
, sdata
)) {
1473 /* skb queued: don't free */
1478 ieee80211_set_qos_hdr(sdata
, skb
);
1479 ieee80211_tx(sdata
, skb
, false);
1483 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1485 struct ieee80211_radiotap_iterator iterator
;
1486 struct ieee80211_radiotap_header
*rthdr
=
1487 (struct ieee80211_radiotap_header
*) skb
->data
;
1488 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1489 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1493 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1494 IEEE80211_TX_CTL_DONTFRAG
;
1497 * for every radiotap entry that is present
1498 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1499 * entries present, or -EINVAL on error)
1503 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1508 /* see if this argument is something we can use */
1509 switch (iterator
.this_arg_index
) {
1511 * You must take care when dereferencing iterator.this_arg
1512 * for multibyte types... the pointer is not aligned. Use
1513 * get_unaligned((type *)iterator.this_arg) to dereference
1514 * iterator.this_arg for type "type" safely on all arches.
1516 case IEEE80211_RADIOTAP_FLAGS
:
1517 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1519 * this indicates that the skb we have been
1520 * handed has the 32-bit FCS CRC at the end...
1521 * we should react to that by snipping it off
1522 * because it will be recomputed and added
1525 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1528 skb_trim(skb
, skb
->len
- FCS_LEN
);
1530 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1531 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1532 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1533 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1536 case IEEE80211_RADIOTAP_TX_FLAGS
:
1537 txflags
= get_unaligned_le16(iterator
.this_arg
);
1538 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1539 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1543 * Please update the file
1544 * Documentation/networking/mac80211-injection.txt
1545 * when parsing new fields here.
1553 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1557 * remove the radiotap header
1558 * iterator->_max_length was sanity-checked against
1559 * skb->len by iterator init
1561 skb_pull(skb
, iterator
._max_length
);
1566 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1567 struct net_device
*dev
)
1569 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1570 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1571 struct ieee80211_radiotap_header
*prthdr
=
1572 (struct ieee80211_radiotap_header
*)skb
->data
;
1573 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1574 struct ieee80211_hdr
*hdr
;
1575 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1580 * Frame injection is not allowed if beaconing is not allowed
1581 * or if we need radar detection. Beaconing is usually not allowed when
1582 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1583 * Passive scan is also used in world regulatory domains where
1584 * your country is not known and as such it should be treated as
1585 * NO TX unless the channel is explicitly allowed in which case
1586 * your current regulatory domain would not have the passive scan
1589 * Since AP mode uses monitor interfaces to inject/TX management
1590 * frames we can make AP mode the exception to this rule once it
1591 * supports radar detection as its implementation can deal with
1592 * radar detection by itself. We can do that later by adding a
1593 * monitor flag interfaces used for AP support.
1595 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1596 IEEE80211_CHAN_PASSIVE_SCAN
)))
1599 /* check for not even having the fixed radiotap header part */
1600 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1601 goto fail
; /* too short to be possibly valid */
1603 /* is it a header version we can trust to find length from? */
1604 if (unlikely(prthdr
->it_version
))
1605 goto fail
; /* only version 0 is supported */
1607 /* then there must be a radiotap header with a length we can use */
1608 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1610 /* does the skb contain enough to deliver on the alleged length? */
1611 if (unlikely(skb
->len
< len_rthdr
))
1612 goto fail
; /* skb too short for claimed rt header extent */
1615 * fix up the pointers accounting for the radiotap
1616 * header still being in there. We are being given
1617 * a precooked IEEE80211 header so no need for
1620 skb_set_mac_header(skb
, len_rthdr
);
1622 * these are just fixed to the end of the rt area since we
1623 * don't have any better information and at this point, nobody cares
1625 skb_set_network_header(skb
, len_rthdr
);
1626 skb_set_transport_header(skb
, len_rthdr
);
1628 if (skb
->len
< len_rthdr
+ 2)
1631 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1632 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1634 if (skb
->len
< len_rthdr
+ hdrlen
)
1638 * Initialize skb->protocol if the injected frame is a data frame
1639 * carrying a rfc1042 header
1641 if (ieee80211_is_data(hdr
->frame_control
) &&
1642 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1643 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1645 if (compare_ether_addr(payload
, rfc1042_header
) == 0)
1646 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1650 memset(info
, 0, sizeof(*info
));
1652 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1653 IEEE80211_TX_CTL_INJECTED
;
1655 /* process and remove the injection radiotap header */
1656 if (!ieee80211_parse_tx_radiotap(skb
))
1662 * We process outgoing injected frames that have a local address
1663 * we handle as though they are non-injected frames.
1664 * This code here isn't entirely correct, the local MAC address
1665 * isn't always enough to find the interface to use; for proper
1666 * VLAN/WDS support we will need a different mechanism (which
1667 * likely isn't going to be monitor interfaces).
1669 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1671 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1672 if (!ieee80211_sdata_running(tmp_sdata
))
1674 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1675 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1676 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1678 if (compare_ether_addr(tmp_sdata
->vif
.addr
, hdr
->addr2
) == 0) {
1684 ieee80211_xmit(sdata
, skb
);
1687 return NETDEV_TX_OK
;
1691 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1695 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1696 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1697 * @skb: packet to be sent
1698 * @dev: incoming interface
1700 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1701 * not be freed, and caller is responsible for either retrying later or freeing
1704 * This function takes in an Ethernet header and encapsulates it with suitable
1705 * IEEE 802.11 header based on which interface the packet is coming in. The
1706 * encapsulated packet will then be passed to master interface, wlan#.11, for
1707 * transmission (through low-level driver).
1709 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1710 struct net_device
*dev
)
1712 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1713 struct ieee80211_local
*local
= sdata
->local
;
1714 struct ieee80211_tx_info
*info
;
1715 int ret
= NETDEV_TX_BUSY
, head_need
;
1716 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1718 struct ieee80211_hdr hdr
;
1719 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1720 struct mesh_path __maybe_unused
*mppath
= NULL
;
1721 const u8
*encaps_data
;
1722 int encaps_len
, skip_header_bytes
;
1724 struct sta_info
*sta
= NULL
;
1725 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1726 bool tdls_direct
= false;
1731 if (unlikely(skb
->len
< ETH_HLEN
)) {
1736 /* convert Ethernet header to proper 802.11 header (based on
1737 * operation mode) */
1738 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1739 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1741 switch (sdata
->vif
.type
) {
1742 case NL80211_IFTYPE_AP_VLAN
:
1744 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1746 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1748 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1749 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1750 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1751 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1753 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1754 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1760 case NL80211_IFTYPE_AP
:
1761 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1763 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1764 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1765 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1768 case NL80211_IFTYPE_WDS
:
1769 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1771 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1772 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1773 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1774 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1777 #ifdef CONFIG_MAC80211_MESH
1778 case NL80211_IFTYPE_MESH_POINT
:
1779 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1780 /* Do not send frames with mesh_ttl == 0 */
1781 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1786 if (!is_multicast_ether_addr(skb
->data
))
1787 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1790 * Use address extension if it is a packet from
1791 * another interface or if we know the destination
1792 * is being proxied by a portal (i.e. portal address
1793 * differs from proxied address)
1795 if (compare_ether_addr(sdata
->vif
.addr
,
1796 skb
->data
+ ETH_ALEN
) == 0 &&
1797 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1798 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1799 skb
->data
, skb
->data
+ ETH_ALEN
);
1801 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1804 int is_mesh_mcast
= 1;
1807 if (is_multicast_ether_addr(skb
->data
))
1808 /* DA TA mSA AE:SA */
1809 mesh_da
= skb
->data
;
1811 static const u8 bcast
[ETH_ALEN
] =
1812 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1814 /* RA TA mDA mSA AE:DA SA */
1815 mesh_da
= mppath
->mpp
;
1818 /* DA TA mSA AE:SA */
1822 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1823 mesh_da
, sdata
->vif
.addr
);
1827 ieee80211_new_mesh_header(&mesh_hdr
,
1829 skb
->data
+ ETH_ALEN
,
1833 ieee80211_new_mesh_header(&mesh_hdr
,
1836 skb
->data
+ ETH_ALEN
);
1841 case NL80211_IFTYPE_STATION
:
1842 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1843 bool tdls_peer
= false;
1846 sta
= sta_info_get(sdata
, skb
->data
);
1848 authorized
= test_sta_flag(sta
,
1849 WLAN_STA_AUTHORIZED
);
1850 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1851 tdls_peer
= test_sta_flag(sta
,
1852 WLAN_STA_TDLS_PEER
);
1853 tdls_auth
= test_sta_flag(sta
,
1854 WLAN_STA_TDLS_PEER_AUTH
);
1859 * If the TDLS link is enabled, send everything
1860 * directly. Otherwise, allow TDLS setup frames
1861 * to be transmitted indirectly.
1863 tdls_direct
= tdls_peer
&& (tdls_auth
||
1864 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1865 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1869 /* link during setup - throw out frames to peer */
1876 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1877 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1878 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1880 } else if (sdata
->u
.mgd
.use_4addr
&&
1881 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1882 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1883 IEEE80211_FCTL_TODS
);
1885 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1886 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1887 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1888 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1891 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1893 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1894 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1895 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1899 case NL80211_IFTYPE_ADHOC
:
1901 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1902 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1903 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1912 * There's no need to try to look up the destination
1913 * if it is a multicast address (which can only happen
1916 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1919 sta
= sta_info_get(sdata
, hdr
.addr1
);
1921 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1922 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1927 /* For mesh, the use of the QoS header is mandatory */
1928 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1931 /* receiver and we are QoS enabled, use a QoS type frame */
1932 if (wme_sta
&& local
->hw
.queues
>= 4) {
1933 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1938 * Drop unicast frames to unauthorised stations unless they are
1939 * EAPOL frames from the local station.
1941 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1942 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1943 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1944 compare_ether_addr(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1945 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1946 if (net_ratelimit())
1947 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1948 " (unauthorized port)\n", dev
->name
,
1952 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1958 if (unlikely(!multicast
&& skb
->sk
&&
1959 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1960 struct sk_buff
*orig_skb
= skb
;
1962 skb
= skb_clone(skb
, GFP_ATOMIC
);
1964 unsigned long flags
;
1967 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1968 r
= idr_get_new_above(&local
->ack_status_frames
,
1971 idr_pre_get(&local
->ack_status_frames
,
1973 r
= idr_get_new_above(&local
->ack_status_frames
,
1976 if (WARN_ON(!id
) || id
> 0xffff) {
1977 idr_remove(&local
->ack_status_frames
, id
);
1980 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1984 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1985 } else if (skb_shared(skb
)) {
1986 kfree_skb(orig_skb
);
1992 /* couldn't clone -- lose tx status ... */
1998 * If the skb is shared we need to obtain our own copy.
2000 if (skb_shared(skb
)) {
2001 struct sk_buff
*tmp_skb
= skb
;
2003 /* can't happen -- skb is a clone if info_id != 0 */
2006 skb
= skb_clone(skb
, GFP_ATOMIC
);
2015 hdr
.frame_control
= fc
;
2016 hdr
.duration_id
= 0;
2019 skip_header_bytes
= ETH_HLEN
;
2020 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
2021 encaps_data
= bridge_tunnel_header
;
2022 encaps_len
= sizeof(bridge_tunnel_header
);
2023 skip_header_bytes
-= 2;
2024 } else if (ethertype
>= 0x600) {
2025 encaps_data
= rfc1042_header
;
2026 encaps_len
= sizeof(rfc1042_header
);
2027 skip_header_bytes
-= 2;
2033 nh_pos
= skb_network_header(skb
) - skb
->data
;
2034 h_pos
= skb_transport_header(skb
) - skb
->data
;
2036 skb_pull(skb
, skip_header_bytes
);
2037 nh_pos
-= skip_header_bytes
;
2038 h_pos
-= skip_header_bytes
;
2040 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2043 * So we need to modify the skb header and hence need a copy of
2044 * that. The head_need variable above doesn't, so far, include
2045 * the needed header space that we don't need right away. If we
2046 * can, then we don't reallocate right now but only after the
2047 * frame arrives at the master device (if it does...)
2049 * If we cannot, however, then we will reallocate to include all
2050 * the ever needed space. Also, if we need to reallocate it anyway,
2051 * make it big enough for everything we may ever need.
2054 if (head_need
> 0 || skb_cloned(skb
)) {
2055 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2056 head_need
+= local
->tx_headroom
;
2057 head_need
= max_t(int, 0, head_need
);
2058 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2063 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2064 nh_pos
+= encaps_len
;
2065 h_pos
+= encaps_len
;
2068 #ifdef CONFIG_MAC80211_MESH
2069 if (meshhdrlen
> 0) {
2070 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2071 nh_pos
+= meshhdrlen
;
2072 h_pos
+= meshhdrlen
;
2076 if (ieee80211_is_data_qos(fc
)) {
2077 __le16
*qos_control
;
2079 qos_control
= (__le16
*) skb_push(skb
, 2);
2080 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2082 * Maybe we could actually set some fields here, for now just
2083 * initialise to zero to indicate no special operation.
2087 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2092 dev
->stats
.tx_packets
++;
2093 dev
->stats
.tx_bytes
+= skb
->len
;
2095 /* Update skb pointers to various headers since this modified frame
2096 * is going to go through Linux networking code that may potentially
2097 * need things like pointer to IP header. */
2098 skb_set_mac_header(skb
, 0);
2099 skb_set_network_header(skb
, nh_pos
);
2100 skb_set_transport_header(skb
, h_pos
);
2102 info
= IEEE80211_SKB_CB(skb
);
2103 memset(info
, 0, sizeof(*info
));
2105 dev
->trans_start
= jiffies
;
2107 info
->flags
= info_flags
;
2108 info
->ack_frame_id
= info_id
;
2110 ieee80211_xmit(sdata
, skb
);
2112 return NETDEV_TX_OK
;
2115 if (ret
== NETDEV_TX_OK
)
2123 * ieee80211_clear_tx_pending may not be called in a context where
2124 * it is possible that it packets could come in again.
2126 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2130 for (i
= 0; i
< local
->hw
.queues
; i
++)
2131 skb_queue_purge(&local
->pending
[i
]);
2135 * Returns false if the frame couldn't be transmitted but was queued instead,
2136 * which in this case means re-queued -- take as an indication to stop sending
2137 * more pending frames.
2139 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2140 struct sk_buff
*skb
)
2142 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2143 struct ieee80211_sub_if_data
*sdata
;
2144 struct sta_info
*sta
;
2145 struct ieee80211_hdr
*hdr
;
2148 sdata
= vif_to_sdata(info
->control
.vif
);
2150 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2151 result
= ieee80211_tx(sdata
, skb
, true);
2153 struct sk_buff_head skbs
;
2155 __skb_queue_head_init(&skbs
);
2156 __skb_queue_tail(&skbs
, skb
);
2158 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2159 sta
= sta_info_get(sdata
, hdr
->addr1
);
2161 result
= __ieee80211_tx(local
, &skbs
, skb
->len
, sta
, true);
2168 * Transmit all pending packets. Called from tasklet.
2170 void ieee80211_tx_pending(unsigned long data
)
2172 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2173 struct ieee80211_sub_if_data
*sdata
;
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 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2211 netif_wake_subqueue(sdata
->dev
, i
);
2213 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2218 /* functions for drivers to get certain frames */
2220 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data
*sdata
,
2221 struct ieee80211_if_ap
*bss
,
2222 struct sk_buff
*skb
,
2223 struct beacon_data
*beacon
)
2227 int i
, have_bits
= 0, n1
, n2
;
2229 /* Generate bitmap for TIM only if there are any STAs in power save
2231 if (atomic_read(&bss
->num_sta_ps
) > 0)
2232 /* in the hope that this is faster than
2233 * checking byte-for-byte */
2234 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2235 IEEE80211_MAX_AID
+1);
2237 if (bss
->dtim_count
== 0)
2238 bss
->dtim_count
= sdata
->vif
.bss_conf
.dtim_period
- 1;
2242 tim
= pos
= (u8
*) skb_put(skb
, 6);
2243 *pos
++ = WLAN_EID_TIM
;
2245 *pos
++ = bss
->dtim_count
;
2246 *pos
++ = sdata
->vif
.bss_conf
.dtim_period
;
2248 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2251 bss
->dtim_bc_mc
= aid0
== 1;
2254 /* Find largest even number N1 so that bits numbered 1 through
2255 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2256 * (N2 + 1) x 8 through 2007 are 0. */
2258 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2265 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2272 /* Bitmap control */
2274 /* Part Virt Bitmap */
2275 skb_put(skb
, n2
- n1
);
2276 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2278 tim
[1] = n2
- n1
+ 4;
2280 *pos
++ = aid0
; /* Bitmap control */
2281 *pos
++ = 0; /* Part Virt Bitmap */
2285 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2286 struct ieee80211_vif
*vif
,
2287 u16
*tim_offset
, u16
*tim_length
)
2289 struct ieee80211_local
*local
= hw_to_local(hw
);
2290 struct sk_buff
*skb
= NULL
;
2291 struct ieee80211_tx_info
*info
;
2292 struct ieee80211_sub_if_data
*sdata
= NULL
;
2293 struct ieee80211_if_ap
*ap
= NULL
;
2294 struct beacon_data
*beacon
;
2295 struct ieee80211_supported_band
*sband
;
2296 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2297 struct ieee80211_tx_rate_control txrc
;
2299 sband
= local
->hw
.wiphy
->bands
[band
];
2303 sdata
= vif_to_sdata(vif
);
2305 if (!ieee80211_sdata_running(sdata
))
2313 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2315 beacon
= rcu_dereference(ap
->beacon
);
2318 * headroom, head length,
2319 * tail length and maximum TIM length
2321 skb
= dev_alloc_skb(local
->tx_headroom
+
2323 beacon
->tail_len
+ 256);
2327 skb_reserve(skb
, local
->tx_headroom
);
2328 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2332 * Not very nice, but we want to allow the driver to call
2333 * ieee80211_beacon_get() as a response to the set_tim()
2334 * callback. That, however, is already invoked under the
2335 * sta_lock to guarantee consistent and race-free update
2336 * of the tim bitmap in mac80211 and the driver.
2338 if (local
->tim_in_locked_section
) {
2339 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2342 unsigned long flags
;
2344 spin_lock_irqsave(&local
->tim_lock
, flags
);
2345 ieee80211_beacon_add_tim(sdata
, ap
, skb
,
2347 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
2351 *tim_offset
= beacon
->head_len
;
2353 *tim_length
= skb
->len
- beacon
->head_len
;
2356 memcpy(skb_put(skb
, beacon
->tail_len
),
2357 beacon
->tail
, beacon
->tail_len
);
2360 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2361 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2362 struct ieee80211_hdr
*hdr
;
2363 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2368 skb
= skb_copy(presp
, GFP_ATOMIC
);
2372 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2373 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2374 IEEE80211_STYPE_BEACON
);
2375 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2376 struct ieee80211_mgmt
*mgmt
;
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 skb
= dev_alloc_skb(local
->tx_headroom
+
2389 2 + 8 + /* supported rates */
2390 2 + 3 + /* DS params */
2391 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2392 2 + sizeof(struct ieee80211_ht_cap
) +
2393 2 + sizeof(struct ieee80211_ht_info
) +
2394 2 + sdata
->u
.mesh
.mesh_id_len
+
2395 2 + sizeof(struct ieee80211_meshconf_ie
) +
2396 sdata
->u
.mesh
.ie_len
);
2400 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2401 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2402 memset(mgmt
, 0, hdr_len
);
2403 mgmt
->frame_control
=
2404 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2405 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2406 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2407 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2408 mgmt
->u
.beacon
.beacon_int
=
2409 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2410 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2411 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2413 pos
= skb_put(skb
, 2);
2414 *pos
++ = WLAN_EID_SSID
;
2417 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
) ||
2418 mesh_add_ds_params_ie(skb
, sdata
) ||
2419 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
) ||
2420 mesh_add_rsn_ie(skb
, sdata
) ||
2421 mesh_add_ht_cap_ie(skb
, sdata
) ||
2422 mesh_add_ht_info_ie(skb
, sdata
) ||
2423 mesh_add_meshid_ie(skb
, sdata
) ||
2424 mesh_add_meshconf_ie(skb
, sdata
) ||
2425 mesh_add_vendor_ies(skb
, sdata
)) {
2426 pr_err("o11s: couldn't add ies!\n");
2434 info
= IEEE80211_SKB_CB(skb
);
2436 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2437 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2440 memset(&txrc
, 0, sizeof(txrc
));
2443 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2445 txrc
.reported_rate
.idx
= -1;
2446 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2447 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2448 txrc
.max_rate_idx
= -1;
2450 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2451 memcpy(txrc
.rate_idx_mcs_mask
, sdata
->rc_rateidx_mcs_mask
[band
],
2452 sizeof(txrc
.rate_idx_mcs_mask
));
2454 rate_control_get_rate(sdata
, NULL
, &txrc
);
2456 info
->control
.vif
= vif
;
2458 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2459 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2460 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2465 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2467 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2468 struct ieee80211_vif
*vif
)
2470 struct ieee80211_if_ap
*ap
= NULL
;
2471 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2472 struct ieee80211_hdr
*hdr
;
2473 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2475 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2481 presp
= rcu_dereference(ap
->probe_resp
);
2485 skb
= skb_copy(presp
, GFP_ATOMIC
);
2489 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2490 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2496 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2498 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2499 struct ieee80211_vif
*vif
)
2501 struct ieee80211_sub_if_data
*sdata
;
2502 struct ieee80211_if_managed
*ifmgd
;
2503 struct ieee80211_pspoll
*pspoll
;
2504 struct ieee80211_local
*local
;
2505 struct sk_buff
*skb
;
2507 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2510 sdata
= vif_to_sdata(vif
);
2511 ifmgd
= &sdata
->u
.mgd
;
2512 local
= sdata
->local
;
2514 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2518 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2520 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2521 memset(pspoll
, 0, sizeof(*pspoll
));
2522 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2523 IEEE80211_STYPE_PSPOLL
);
2524 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2526 /* aid in PS-Poll has its two MSBs each set to 1 */
2527 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2529 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2530 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2534 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2536 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2537 struct ieee80211_vif
*vif
)
2539 struct ieee80211_hdr_3addr
*nullfunc
;
2540 struct ieee80211_sub_if_data
*sdata
;
2541 struct ieee80211_if_managed
*ifmgd
;
2542 struct ieee80211_local
*local
;
2543 struct sk_buff
*skb
;
2545 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2548 sdata
= vif_to_sdata(vif
);
2549 ifmgd
= &sdata
->u
.mgd
;
2550 local
= sdata
->local
;
2552 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2556 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2558 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2560 memset(nullfunc
, 0, sizeof(*nullfunc
));
2561 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2562 IEEE80211_STYPE_NULLFUNC
|
2563 IEEE80211_FCTL_TODS
);
2564 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2565 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2566 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2570 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2572 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2573 struct ieee80211_vif
*vif
,
2574 const u8
*ssid
, size_t ssid_len
,
2575 const u8
*ie
, size_t ie_len
)
2577 struct ieee80211_sub_if_data
*sdata
;
2578 struct ieee80211_local
*local
;
2579 struct ieee80211_hdr_3addr
*hdr
;
2580 struct sk_buff
*skb
;
2584 sdata
= vif_to_sdata(vif
);
2585 local
= sdata
->local
;
2586 ie_ssid_len
= 2 + ssid_len
;
2588 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2589 ie_ssid_len
+ ie_len
);
2593 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2595 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2596 memset(hdr
, 0, sizeof(*hdr
));
2597 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2598 IEEE80211_STYPE_PROBE_REQ
);
2599 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2600 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2601 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2603 pos
= skb_put(skb
, ie_ssid_len
);
2604 *pos
++ = WLAN_EID_SSID
;
2607 memcpy(pos
, ssid
, ssid_len
);
2611 pos
= skb_put(skb
, ie_len
);
2612 memcpy(pos
, ie
, ie_len
);
2617 EXPORT_SYMBOL(ieee80211_probereq_get
);
2619 void ieee80211_rts_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_rts
*rts
)
2624 const struct ieee80211_hdr
*hdr
= frame
;
2626 rts
->frame_control
=
2627 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2628 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2630 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2631 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2633 EXPORT_SYMBOL(ieee80211_rts_get
);
2635 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2636 const void *frame
, size_t frame_len
,
2637 const struct ieee80211_tx_info
*frame_txctl
,
2638 struct ieee80211_cts
*cts
)
2640 const struct ieee80211_hdr
*hdr
= frame
;
2642 cts
->frame_control
=
2643 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2644 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2645 frame_len
, frame_txctl
);
2646 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2648 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2651 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2652 struct ieee80211_vif
*vif
)
2654 struct ieee80211_local
*local
= hw_to_local(hw
);
2655 struct sk_buff
*skb
= NULL
;
2656 struct ieee80211_tx_data tx
;
2657 struct ieee80211_sub_if_data
*sdata
;
2658 struct ieee80211_if_ap
*bss
= NULL
;
2659 struct beacon_data
*beacon
;
2660 struct ieee80211_tx_info
*info
;
2662 sdata
= vif_to_sdata(vif
);
2666 beacon
= rcu_dereference(bss
->beacon
);
2668 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2671 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2672 goto out
; /* send buffered bc/mc only after DTIM beacon */
2675 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2678 local
->total_ps_buffered
--;
2680 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2681 struct ieee80211_hdr
*hdr
=
2682 (struct ieee80211_hdr
*) skb
->data
;
2683 /* more buffered multicast/broadcast frames ==> set
2684 * MoreData flag in IEEE 802.11 header to inform PS
2686 hdr
->frame_control
|=
2687 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2690 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2692 dev_kfree_skb_any(skb
);
2695 info
= IEEE80211_SKB_CB(skb
);
2697 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2698 tx
.channel
= local
->hw
.conf
.channel
;
2699 info
->band
= tx
.channel
->band
;
2701 if (invoke_tx_handlers(&tx
))
2708 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2710 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data
*sdata
,
2711 struct sk_buff
*skb
, int tid
)
2713 skb_set_mac_header(skb
, 0);
2714 skb_set_network_header(skb
, 0);
2715 skb_set_transport_header(skb
, 0);
2717 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
2718 skb
->priority
= tid
;
2721 * The other path calling ieee80211_xmit is from the tasklet,
2722 * and while we can handle concurrent transmissions locking
2723 * requirements are that we do not come into tx with bhs on.
2726 ieee80211_xmit(sdata
, skb
);