2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
38 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
41 int rate
, mrate
, erp
, dur
, i
;
42 struct ieee80211_rate
*txrate
;
43 struct ieee80211_local
*local
= tx
->local
;
44 struct ieee80211_supported_band
*sband
;
45 struct ieee80211_hdr
*hdr
;
46 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
48 /* assume HW handles this */
49 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
53 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
56 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
57 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
59 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
62 * data and mgmt (except PS Poll):
64 * - during contention period:
65 * if addr1 is group address: 0
66 * if more fragments = 0 and addr1 is individual address: time to
67 * transmit one ACK plus SIFS
68 * if more fragments = 1 and addr1 is individual address: time to
69 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 * - control response frame (CTS or ACK) shall be transmitted using the
73 * same rate as the immediately previous frame in the frame exchange
74 * sequence, if this rate belongs to the PHY mandatory rates, or else
75 * at the highest possible rate belonging to the PHY rates in the
78 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
79 if (ieee80211_is_ctl(hdr
->frame_control
)) {
80 /* TODO: These control frames are not currently sent by
81 * mac80211, but should they be implemented, this function
82 * needs to be updated to support duration field calculation.
84 * RTS: time needed to transmit pending data/mgmt frame plus
85 * one CTS frame plus one ACK frame plus 3 x SIFS
86 * CTS: duration of immediately previous RTS minus time
87 * required to transmit CTS and its SIFS
88 * ACK: 0 if immediately previous directed data/mgmt had
89 * more=0, with more=1 duration in ACK frame is duration
90 * from previous frame minus time needed to transmit ACK
92 * PS Poll: BIT(15) | BIT(14) | aid
98 if (0 /* FIX: data/mgmt during CFP */)
99 return cpu_to_le16(32768);
101 if (group_addr
) /* Group address as the destination - no ACK */
104 /* Individual destination address:
105 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
106 * CTS and ACK frames shall be transmitted using the highest rate in
107 * basic rate set that is less than or equal to the rate of the
108 * immediately previous frame and that is using the same modulation
109 * (CCK or OFDM). If no basic rate set matches with these requirements,
110 * the highest mandatory rate of the PHY that is less than or equal to
111 * the rate of the previous frame is used.
112 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 /* use lowest available if everything fails */
116 mrate
= sband
->bitrates
[0].bitrate
;
117 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
118 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
120 if (r
->bitrate
> txrate
->bitrate
)
123 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
126 switch (sband
->band
) {
127 case IEEE80211_BAND_2GHZ
: {
129 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
130 flag
= IEEE80211_RATE_MANDATORY_G
;
132 flag
= IEEE80211_RATE_MANDATORY_B
;
137 case IEEE80211_BAND_5GHZ
:
138 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
141 case IEEE80211_NUM_BANDS
:
147 /* No matching basic rate found; use highest suitable mandatory
152 /* Time needed to transmit ACK
153 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
154 * to closest integer */
156 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
157 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
160 /* Frame is fragmented: duration increases with time needed to
161 * transmit next fragment plus ACK and 2 x SIFS. */
162 dur
*= 2; /* ACK + SIFS */
164 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
165 txrate
->bitrate
, erp
,
166 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
169 return cpu_to_le16(dur
);
172 static inline int is_ieee80211_device(struct ieee80211_local
*local
,
173 struct net_device
*dev
)
175 return local
== wdev_priv(dev
->ieee80211_ptr
);
179 static ieee80211_tx_result debug_noinline
180 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data
*tx
)
182 struct ieee80211_local
*local
= tx
->local
;
183 struct ieee80211_if_managed
*ifmgd
;
185 /* driver doesn't support power save */
186 if (!(local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PS
))
189 /* hardware does dynamic power save */
190 if (local
->hw
.flags
& IEEE80211_HW_SUPPORTS_DYNAMIC_PS
)
193 /* dynamic power save disabled */
194 if (local
->hw
.conf
.dynamic_ps_timeout
<= 0)
197 /* we are scanning, don't enable power save */
201 if (!local
->ps_sdata
)
204 /* No point if we're going to suspend */
205 if (local
->quiescing
)
208 /* dynamic ps is supported only in managed mode */
209 if (tx
->sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
212 ifmgd
= &tx
->sdata
->u
.mgd
;
215 * Don't wakeup from power save if u-apsd is enabled, voip ac has
216 * u-apsd enabled and the frame is in voip class. This effectively
217 * means that even if all access categories have u-apsd enabled, in
218 * practise u-apsd is only used with the voip ac. This is a
219 * workaround for the case when received voip class packets do not
220 * have correct qos tag for some reason, due the network or the
223 * Note: local->uapsd_queues access is racy here. If the value is
224 * changed via debugfs, user needs to reassociate manually to have
225 * everything in sync.
227 if ((ifmgd
->flags
& IEEE80211_STA_UAPSD_ENABLED
)
228 && (local
->uapsd_queues
& IEEE80211_WMM_IE_STA_QOSINFO_AC_VO
)
229 && skb_get_queue_mapping(tx
->skb
) == 0)
232 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
233 ieee80211_stop_queues_by_reason(&local
->hw
,
234 IEEE80211_QUEUE_STOP_REASON_PS
);
235 ifmgd
->flags
&= ~IEEE80211_STA_NULLFUNC_ACKED
;
236 ieee80211_queue_work(&local
->hw
,
237 &local
->dynamic_ps_disable_work
);
240 /* Don't restart the timer if we're not disassociated */
241 if (!ifmgd
->associated
)
244 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
245 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
250 static ieee80211_tx_result debug_noinline
251 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
254 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
255 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
258 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
261 if (unlikely(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
)) &&
262 test_bit(SDATA_STATE_OFFCHANNEL
, &tx
->sdata
->state
) &&
263 !ieee80211_is_probe_req(hdr
->frame_control
) &&
264 !ieee80211_is_nullfunc(hdr
->frame_control
))
266 * When software scanning only nullfunc frames (to notify
267 * the sleep state to the AP) and probe requests (for the
268 * active scan) are allowed, all other frames should not be
269 * sent and we should not get here, but if we do
270 * nonetheless, drop them to avoid sending them
271 * off-channel. See the link below and
272 * ieee80211_start_scan() for more.
274 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
278 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
281 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
284 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
288 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
290 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
291 if (unlikely(!assoc
&&
292 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
293 ieee80211_is_data(hdr
->frame_control
))) {
294 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
295 printk(KERN_DEBUG
"%s: dropped data frame to not "
296 "associated station %pM\n",
297 tx
->sdata
->name
, hdr
->addr1
);
298 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
299 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
303 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
304 tx
->local
->num_sta
== 0 &&
305 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
307 * No associated STAs - no need to send multicast
318 /* This function is called whenever the AP is about to exceed the maximum limit
319 * of buffered frames for power saving STAs. This situation should not really
320 * happen often during normal operation, so dropping the oldest buffered packet
321 * from each queue should be OK to make some room for new frames. */
322 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
324 int total
= 0, purged
= 0;
326 struct ieee80211_sub_if_data
*sdata
;
327 struct sta_info
*sta
;
330 * virtual interfaces are protected by RCU
334 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
335 struct ieee80211_if_ap
*ap
;
336 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
339 skb
= skb_dequeue(&ap
->ps_bc_buf
);
344 total
+= skb_queue_len(&ap
->ps_bc_buf
);
348 * Drop one frame from each station from the lowest-priority
349 * AC that has frames at all.
351 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
354 for (ac
= IEEE80211_AC_BK
; ac
>= IEEE80211_AC_VO
; ac
--) {
355 skb
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
356 total
+= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
367 local
->total_ps_buffered
= total
;
368 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 wiphy_debug(local
->hw
.wiphy
, "PS buffers full - purged %d frames\n",
374 static ieee80211_tx_result
375 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
377 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
378 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
381 * broadcast/multicast frame
383 * If any of the associated stations is in power save mode,
384 * the frame is buffered to be sent after DTIM beacon frame.
385 * This is done either by the hardware or us.
388 /* powersaving STAs only in AP/VLAN mode */
392 /* no buffering for ordered frames */
393 if (ieee80211_has_order(hdr
->frame_control
))
396 /* no stations in PS mode */
397 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
400 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
402 /* device releases frame after DTIM beacon */
403 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
))
406 /* buffered in mac80211 */
407 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
408 purge_old_ps_buffers(tx
->local
);
410 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >= AP_MAX_BC_BUFFER
) {
411 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
413 printk(KERN_DEBUG
"%s: BC TX buffer full - dropping the oldest frame\n",
416 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
418 tx
->local
->total_ps_buffered
++;
420 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
425 static int ieee80211_use_mfp(__le16 fc
, struct sta_info
*sta
,
428 if (!ieee80211_is_mgmt(fc
))
431 if (sta
== NULL
|| !test_sta_flag(sta
, WLAN_STA_MFP
))
434 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*)
441 static ieee80211_tx_result
442 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
444 struct sta_info
*sta
= tx
->sta
;
445 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
446 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
447 struct ieee80211_local
*local
= tx
->local
;
450 ieee80211_is_probe_resp(hdr
->frame_control
) ||
451 ieee80211_is_auth(hdr
->frame_control
) ||
452 ieee80211_is_assoc_resp(hdr
->frame_control
) ||
453 ieee80211_is_reassoc_resp(hdr
->frame_control
)))
456 if (unlikely((test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
457 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) &&
458 !(info
->flags
& IEEE80211_TX_CTL_POLL_RESPONSE
))) {
459 int ac
= skb_get_queue_mapping(tx
->skb
);
461 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
462 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer for AC %d\n",
463 sta
->sta
.addr
, sta
->sta
.aid
, ac
);
464 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
465 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
466 purge_old_ps_buffers(tx
->local
);
467 if (skb_queue_len(&sta
->ps_tx_buf
[ac
]) >= STA_MAX_TX_BUFFER
) {
468 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
[ac
]);
469 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
471 printk(KERN_DEBUG
"%s: STA %pM TX buffer for "
472 "AC %d full - dropping oldest frame\n",
473 tx
->sdata
->name
, sta
->sta
.addr
, ac
);
477 tx
->local
->total_ps_buffered
++;
479 info
->control
.jiffies
= jiffies
;
480 info
->control
.vif
= &tx
->sdata
->vif
;
481 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
482 skb_queue_tail(&sta
->ps_tx_buf
[ac
], tx
->skb
);
484 if (!timer_pending(&local
->sta_cleanup
))
485 mod_timer(&local
->sta_cleanup
,
486 round_jiffies(jiffies
+
487 STA_INFO_CLEANUP_INTERVAL
));
490 * We queued up some frames, so the TIM bit might
491 * need to be set, recalculate it.
493 sta_info_recalc_tim(sta
);
497 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
498 else if (unlikely(test_sta_flag(sta
, WLAN_STA_PS_STA
))) {
500 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
501 tx
->sdata
->name
, sta
->sta
.addr
);
503 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
508 static ieee80211_tx_result debug_noinline
509 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
511 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
514 if (tx
->flags
& IEEE80211_TX_UNICAST
)
515 return ieee80211_tx_h_unicast_ps_buf(tx
);
517 return ieee80211_tx_h_multicast_ps_buf(tx
);
520 static ieee80211_tx_result debug_noinline
521 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data
*tx
)
523 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
525 if (unlikely(tx
->sdata
->control_port_protocol
== tx
->skb
->protocol
&&
526 tx
->sdata
->control_port_no_encrypt
))
527 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
532 static ieee80211_tx_result debug_noinline
533 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
535 struct ieee80211_key
*key
= NULL
;
536 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
537 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
539 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
))
541 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->ptk
)))
543 else if (ieee80211_is_mgmt(hdr
->frame_control
) &&
544 is_multicast_ether_addr(hdr
->addr1
) &&
545 ieee80211_is_robust_mgmt_frame(hdr
) &&
546 (key
= rcu_dereference(tx
->sdata
->default_mgmt_key
)))
548 else if (is_multicast_ether_addr(hdr
->addr1
) &&
549 (key
= rcu_dereference(tx
->sdata
->default_multicast_key
)))
551 else if (!is_multicast_ether_addr(hdr
->addr1
) &&
552 (key
= rcu_dereference(tx
->sdata
->default_unicast_key
)))
554 else if (tx
->sdata
->drop_unencrypted
&&
555 (tx
->skb
->protocol
!= tx
->sdata
->control_port_protocol
) &&
556 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
) &&
557 (!ieee80211_is_robust_mgmt_frame(hdr
) ||
558 (ieee80211_is_action(hdr
->frame_control
) &&
559 tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_MFP
)))) {
560 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
566 bool skip_hw
= false;
568 tx
->key
->tx_rx_count
++;
569 /* TODO: add threshold stuff again */
571 switch (tx
->key
->conf
.cipher
) {
572 case WLAN_CIPHER_SUITE_WEP40
:
573 case WLAN_CIPHER_SUITE_WEP104
:
574 if (ieee80211_is_auth(hdr
->frame_control
))
576 case WLAN_CIPHER_SUITE_TKIP
:
577 if (!ieee80211_is_data_present(hdr
->frame_control
))
580 case WLAN_CIPHER_SUITE_CCMP
:
581 if (!ieee80211_is_data_present(hdr
->frame_control
) &&
582 !ieee80211_use_mfp(hdr
->frame_control
, tx
->sta
,
586 skip_hw
= (tx
->key
->conf
.flags
&
587 IEEE80211_KEY_FLAG_SW_MGMT
) &&
588 ieee80211_is_mgmt(hdr
->frame_control
);
590 case WLAN_CIPHER_SUITE_AES_CMAC
:
591 if (!ieee80211_is_mgmt(hdr
->frame_control
))
596 if (unlikely(tx
->key
&& tx
->key
->flags
& KEY_FLAG_TAINTED
))
599 if (!skip_hw
&& tx
->key
&&
600 tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
)
601 info
->control
.hw_key
= &tx
->key
->conf
;
607 static ieee80211_tx_result debug_noinline
608 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
610 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
611 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
612 struct ieee80211_supported_band
*sband
;
613 struct ieee80211_rate
*rate
;
616 bool inval
= false, rts
= false, short_preamble
= false;
617 struct ieee80211_tx_rate_control txrc
;
620 memset(&txrc
, 0, sizeof(txrc
));
622 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
624 len
= min_t(u32
, tx
->skb
->len
+ FCS_LEN
,
625 tx
->local
->hw
.wiphy
->frag_threshold
);
627 /* set up the tx rate control struct we give the RC algo */
628 txrc
.hw
= local_to_hw(tx
->local
);
630 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
632 txrc
.reported_rate
.idx
= -1;
633 txrc
.rate_idx_mask
= tx
->sdata
->rc_rateidx_mask
[tx
->channel
->band
];
634 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
635 txrc
.max_rate_idx
= -1;
637 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
638 txrc
.bss
= (tx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
639 tx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
);
641 /* set up RTS protection if desired */
642 if (len
> tx
->local
->hw
.wiphy
->rts_threshold
) {
643 txrc
.rts
= rts
= true;
647 * Use short preamble if the BSS can handle it, but not for
648 * management frames unless we know the receiver can handle
649 * that -- the management frame might be to a station that
650 * just wants a probe response.
652 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
653 (ieee80211_is_data(hdr
->frame_control
) ||
654 (tx
->sta
&& test_sta_flag(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
655 txrc
.short_preamble
= short_preamble
= true;
658 assoc
= test_sta_flag(tx
->sta
, WLAN_STA_ASSOC
);
661 * Lets not bother rate control if we're associated and cannot
662 * talk to the sta. This should not happen.
664 if (WARN(test_bit(SCAN_SW_SCANNING
, &tx
->local
->scanning
) && assoc
&&
665 !rate_usable_index_exists(sband
, &tx
->sta
->sta
),
666 "%s: Dropped data frame as no usable bitrate found while "
667 "scanning and associated. Target station: "
668 "%pM on %d GHz band\n",
669 tx
->sdata
->name
, hdr
->addr1
,
670 tx
->channel
->band
? 5 : 2))
674 * If we're associated with the sta at this point we know we can at
675 * least send the frame at the lowest bit rate.
677 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
679 if (unlikely(info
->control
.rates
[0].idx
< 0))
682 if (txrc
.reported_rate
.idx
< 0) {
683 txrc
.reported_rate
= info
->control
.rates
[0];
684 if (tx
->sta
&& ieee80211_is_data(hdr
->frame_control
))
685 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
687 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
689 if (unlikely(!info
->control
.rates
[0].count
))
690 info
->control
.rates
[0].count
= 1;
692 if (WARN_ON_ONCE((info
->control
.rates
[0].count
> 1) &&
693 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)))
694 info
->control
.rates
[0].count
= 1;
696 if (is_multicast_ether_addr(hdr
->addr1
)) {
698 * XXX: verify the rate is in the basic rateset
704 * set up the RTS/CTS rate as the fastest basic rate
705 * that is not faster than the data rate
707 * XXX: Should this check all retry rates?
709 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
712 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
714 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
715 /* must be a basic rate */
716 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
718 /* must not be faster than the data rate */
719 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
722 if (sband
->bitrates
[baserate
].bitrate
<
723 sband
->bitrates
[i
].bitrate
)
727 info
->control
.rts_cts_rate_idx
= baserate
;
730 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
732 * make sure there's no valid rate following
733 * an invalid one, just in case drivers don't
734 * take the API seriously to stop at -1.
737 info
->control
.rates
[i
].idx
= -1;
740 if (info
->control
.rates
[i
].idx
< 0) {
746 * For now assume MCS is already set up correctly, this
749 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
750 WARN_ON(info
->control
.rates
[i
].idx
> 76);
754 /* set up RTS protection if desired */
756 info
->control
.rates
[i
].flags
|=
757 IEEE80211_TX_RC_USE_RTS_CTS
;
760 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
761 sband
->n_bitrates
)) {
762 info
->control
.rates
[i
].idx
= -1;
766 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
768 /* set up short preamble */
769 if (short_preamble
&&
770 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
771 info
->control
.rates
[i
].flags
|=
772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
774 /* set up G protection */
775 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
776 rate
->flags
& IEEE80211_RATE_ERP_G
)
777 info
->control
.rates
[i
].flags
|=
778 IEEE80211_TX_RC_USE_CTS_PROTECT
;
784 static ieee80211_tx_result debug_noinline
785 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
787 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
788 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
794 * Packet injection may want to control the sequence
795 * number, if we have no matching interface then we
796 * neither assign one ourselves nor ask the driver to.
798 if (unlikely(info
->control
.vif
->type
== NL80211_IFTYPE_MONITOR
))
801 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
804 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
807 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
811 * Anything but QoS data that has a sequence number field
812 * (is long enough) gets a sequence number from the global
815 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
816 /* driver should assign sequence number */
817 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
818 /* for pure STA mode without beacons, we can do it */
819 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
820 tx
->sdata
->sequence_number
+= 0x10;
825 * This should be true for injected/management frames only, for
826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
827 * above since they are not QoS-data frames.
832 /* include per-STA, per-TID sequence counter */
834 qc
= ieee80211_get_qos_ctl(hdr
);
835 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
836 seq
= &tx
->sta
->tid_seq
[tid
];
838 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
840 /* Increase the sequence number. */
841 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
846 static int ieee80211_fragment(struct ieee80211_local
*local
,
847 struct sk_buff
*skb
, int hdrlen
,
850 struct sk_buff
*tail
= skb
, *tmp
;
851 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
852 int pos
= hdrlen
+ per_fragm
;
853 int rem
= skb
->len
- hdrlen
- per_fragm
;
855 if (WARN_ON(rem
< 0))
859 int fraglen
= per_fragm
;
864 tmp
= dev_alloc_skb(local
->tx_headroom
+
866 IEEE80211_ENCRYPT_HEADROOM
+
867 IEEE80211_ENCRYPT_TAILROOM
);
872 skb_reserve(tmp
, local
->tx_headroom
+
873 IEEE80211_ENCRYPT_HEADROOM
);
874 /* copy control information */
875 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
876 skb_copy_queue_mapping(tmp
, skb
);
877 tmp
->priority
= skb
->priority
;
880 /* copy header and data */
881 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
882 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
887 skb
->len
= hdrlen
+ per_fragm
;
891 static ieee80211_tx_result debug_noinline
892 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
894 struct sk_buff
*skb
= tx
->skb
;
895 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
896 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
897 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
901 if (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)
904 if (tx
->local
->ops
->set_frag_threshold
)
908 * Warn when submitting a fragmented A-MPDU frame and drop it.
909 * This scenario is handled in ieee80211_tx_prepare but extra
910 * caution taken here as fragmented ampdu may cause Tx stop.
912 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
915 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
917 /* internal error, why isn't DONTFRAG set? */
918 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
922 * Now fragment the frame. This will allocate all the fragments and
923 * chain them (using skb as the first fragment) to skb->next.
924 * During transmission, we will remove the successfully transmitted
925 * fragments from this list. When the low-level driver rejects one
926 * of the fragments then we will simply pretend to accept the skb
927 * but store it away as pending.
929 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
932 /* update duration/seq/flags of fragments */
936 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
938 hdr
= (void *)skb
->data
;
939 info
= IEEE80211_SKB_CB(skb
);
942 hdr
->frame_control
|= morefrags
;
943 next_len
= skb
->next
->len
;
945 * No multi-rate retries for fragmented frames, that
946 * would completely throw off the NAV at other STAs.
948 info
->control
.rates
[1].idx
= -1;
949 info
->control
.rates
[2].idx
= -1;
950 info
->control
.rates
[3].idx
= -1;
951 info
->control
.rates
[4].idx
= -1;
952 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
953 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
955 hdr
->frame_control
&= ~morefrags
;
958 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
959 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
961 } while ((skb
= skb
->next
));
966 static ieee80211_tx_result debug_noinline
967 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
969 struct sk_buff
*skb
= tx
->skb
;
974 tx
->sta
->tx_packets
++;
976 tx
->sta
->tx_fragments
++;
977 tx
->sta
->tx_bytes
+= skb
->len
;
978 } while ((skb
= skb
->next
));
983 static ieee80211_tx_result debug_noinline
984 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
986 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
991 switch (tx
->key
->conf
.cipher
) {
992 case WLAN_CIPHER_SUITE_WEP40
:
993 case WLAN_CIPHER_SUITE_WEP104
:
994 return ieee80211_crypto_wep_encrypt(tx
);
995 case WLAN_CIPHER_SUITE_TKIP
:
996 return ieee80211_crypto_tkip_encrypt(tx
);
997 case WLAN_CIPHER_SUITE_CCMP
:
998 return ieee80211_crypto_ccmp_encrypt(tx
);
999 case WLAN_CIPHER_SUITE_AES_CMAC
:
1000 return ieee80211_crypto_aes_cmac_encrypt(tx
);
1002 /* handle hw-only algorithm */
1003 if (info
->control
.hw_key
) {
1004 ieee80211_tx_set_protected(tx
);
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1017 struct sk_buff
*skb
= tx
->skb
;
1018 struct ieee80211_hdr
*hdr
;
1023 hdr
= (void *) skb
->data
;
1024 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1025 break; /* must not overwrite AID */
1026 next_len
= skb
->next
? skb
->next
->len
: 0;
1027 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1030 ieee80211_duration(tx
, group_addr
, next_len
);
1031 } while ((skb
= skb
->next
));
1036 /* actual transmit path */
1038 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1039 struct sk_buff
*skb
,
1040 struct ieee80211_tx_info
*info
,
1041 struct tid_ampdu_tx
*tid_tx
,
1044 bool queued
= false;
1046 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1047 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1048 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1050 * nothing -- this aggregation session is being started
1051 * but that might still fail with the driver
1054 spin_lock(&tx
->sta
->lock
);
1056 * Need to re-check now, because we may get here
1058 * 1) in the window during which the setup is actually
1059 * already done, but not marked yet because not all
1060 * packets are spliced over to the driver pending
1061 * queue yet -- if this happened we acquire the lock
1062 * either before or after the splice happens, but
1063 * need to recheck which of these cases happened.
1065 * 2) during session teardown, if the OPERATIONAL bit
1066 * was cleared due to the teardown but the pointer
1067 * hasn't been assigned NULL yet (or we loaded it
1068 * before it was assigned) -- in this case it may
1069 * now be NULL which means we should just let the
1070 * packet pass through because splicing the frames
1071 * back is already done.
1073 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1076 /* do nothing, let packet pass through */
1077 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1078 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1081 info
->control
.vif
= &tx
->sdata
->vif
;
1082 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1083 __skb_queue_tail(&tid_tx
->pending
, skb
);
1085 spin_unlock(&tx
->sta
->lock
);
1094 static ieee80211_tx_result
1095 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1096 struct ieee80211_tx_data
*tx
,
1097 struct sk_buff
*skb
)
1099 struct ieee80211_local
*local
= sdata
->local
;
1100 struct ieee80211_hdr
*hdr
;
1101 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1105 memset(tx
, 0, sizeof(*tx
));
1109 tx
->channel
= local
->hw
.conf
.channel
;
1112 * If this flag is set to true anywhere, and we get here,
1113 * we are doing the needed processing, so remove the flag
1116 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1118 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1120 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1121 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1122 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1124 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1125 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1128 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1130 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1131 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1132 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1133 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1134 struct tid_ampdu_tx
*tid_tx
;
1136 qc
= ieee80211_get_qos_ctl(hdr
);
1137 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1139 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1143 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1146 if (unlikely(queued
))
1151 if (is_multicast_ether_addr(hdr
->addr1
)) {
1152 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1153 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1155 tx
->flags
|= IEEE80211_TX_UNICAST
;
1156 if (unlikely(local
->wifi_wme_noack_test
))
1157 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1159 * Flags are initialized to 0. Hence, no need to
1160 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
1161 * it might already be set for injected frames.
1165 if (!(info
->flags
& IEEE80211_TX_CTL_DONTFRAG
)) {
1166 if (!(tx
->flags
& IEEE80211_TX_UNICAST
) ||
1167 skb
->len
+ FCS_LEN
<= local
->hw
.wiphy
->frag_threshold
||
1168 info
->flags
& IEEE80211_TX_CTL_AMPDU
)
1169 info
->flags
|= IEEE80211_TX_CTL_DONTFRAG
;
1173 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1174 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1175 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1177 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1183 * Returns false if the frame couldn't be transmitted but was queued instead.
1185 static bool __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
**skbp
,
1186 struct sta_info
*sta
, bool txpending
)
1188 struct sk_buff
*skb
= *skbp
, *next
;
1189 struct ieee80211_tx_info
*info
;
1190 struct ieee80211_sub_if_data
*sdata
;
1191 unsigned long flags
;
1196 int q
= skb_get_queue_mapping(skb
);
1199 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1200 if (local
->queue_stop_reasons
[q
] ||
1201 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1203 * Since queue is stopped, queue up frames for later
1204 * transmission from the tx-pending tasklet when the
1205 * queue is woken again.
1212 * NB: If txpending is true, next must already
1213 * be NULL since we must've gone through this
1214 * loop before already; therefore we can just
1215 * queue the frame to the head without worrying
1216 * about reordering of fragments.
1218 if (unlikely(txpending
))
1219 __skb_queue_head(&local
->pending
[q
],
1222 __skb_queue_tail(&local
->pending
[q
],
1224 } while ((skb
= next
));
1226 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1230 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1232 info
= IEEE80211_SKB_CB(skb
);
1235 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1236 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1242 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1244 sdata
= vif_to_sdata(info
->control
.vif
);
1246 switch (sdata
->vif
.type
) {
1247 case NL80211_IFTYPE_MONITOR
:
1248 info
->control
.vif
= NULL
;
1250 case NL80211_IFTYPE_AP_VLAN
:
1251 info
->control
.vif
= &container_of(sdata
->bss
,
1252 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1259 if (sta
&& sta
->uploaded
)
1260 info
->control
.sta
= &sta
->sta
;
1262 info
->control
.sta
= NULL
;
1264 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1267 ieee80211_tpt_led_trig_tx(local
, fc
, len
);
1269 ieee80211_led_tx(local
, 1);
1277 * Invoke TX handlers, return 0 on success and non-zero if the
1278 * frame was dropped or queued.
1280 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1282 struct sk_buff
*skb
= tx
->skb
;
1283 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1284 ieee80211_tx_result res
= TX_DROP
;
1286 #define CALL_TXH(txh) \
1289 if (res != TX_CONTINUE) \
1293 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1294 CALL_TXH(ieee80211_tx_h_check_assoc
);
1295 CALL_TXH(ieee80211_tx_h_ps_buf
);
1296 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1297 CALL_TXH(ieee80211_tx_h_select_key
);
1298 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1299 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1301 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1304 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1305 CALL_TXH(ieee80211_tx_h_sequence
);
1306 CALL_TXH(ieee80211_tx_h_fragment
);
1307 /* handlers after fragment must be aware of tx info fragmentation! */
1308 CALL_TXH(ieee80211_tx_h_stats
);
1309 CALL_TXH(ieee80211_tx_h_encrypt
);
1310 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1311 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1315 if (unlikely(res
== TX_DROP
)) {
1316 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1318 struct sk_buff
*next
;
1325 } else if (unlikely(res
== TX_QUEUED
)) {
1326 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1334 * Returns false if the frame couldn't be transmitted but was queued instead.
1336 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1337 struct sk_buff
*skb
, bool txpending
)
1339 struct ieee80211_local
*local
= sdata
->local
;
1340 struct ieee80211_tx_data tx
;
1341 ieee80211_tx_result res_prepare
;
1342 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1345 if (unlikely(skb
->len
< 10)) {
1352 /* initialises tx */
1353 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1355 if (unlikely(res_prepare
== TX_DROP
)) {
1358 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1362 tx
.channel
= local
->hw
.conf
.channel
;
1363 info
->band
= tx
.channel
->band
;
1365 if (!invoke_tx_handlers(&tx
))
1366 result
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1372 /* device xmit handlers */
1374 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1375 struct sk_buff
*skb
,
1376 int head_need
, bool may_encrypt
)
1378 struct ieee80211_local
*local
= sdata
->local
;
1381 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1382 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1383 tail_need
-= skb_tailroom(skb
);
1384 tail_need
= max_t(int, tail_need
, 0);
1387 if (skb_cloned(skb
))
1388 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1389 else if (head_need
|| tail_need
)
1390 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1394 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1395 wiphy_debug(local
->hw
.wiphy
,
1396 "failed to reallocate TX buffer\n");
1403 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1405 struct ieee80211_local
*local
= sdata
->local
;
1406 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1407 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1413 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1415 headroom
= local
->tx_headroom
;
1417 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1418 headroom
-= skb_headroom(skb
);
1419 headroom
= max_t(int, 0, headroom
);
1421 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1427 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1428 info
->control
.vif
= &sdata
->vif
;
1430 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1431 ieee80211_is_data(hdr
->frame_control
) &&
1432 !is_multicast_ether_addr(hdr
->addr1
))
1433 if (mesh_nexthop_lookup(skb
, sdata
)) {
1434 /* skb queued: don't free */
1439 ieee80211_set_qos_hdr(sdata
, skb
);
1440 ieee80211_tx(sdata
, skb
, false);
1444 static bool ieee80211_parse_tx_radiotap(struct sk_buff
*skb
)
1446 struct ieee80211_radiotap_iterator iterator
;
1447 struct ieee80211_radiotap_header
*rthdr
=
1448 (struct ieee80211_radiotap_header
*) skb
->data
;
1449 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1450 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1454 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
|
1455 IEEE80211_TX_CTL_DONTFRAG
;
1458 * for every radiotap entry that is present
1459 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1460 * entries present, or -EINVAL on error)
1464 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1469 /* see if this argument is something we can use */
1470 switch (iterator
.this_arg_index
) {
1472 * You must take care when dereferencing iterator.this_arg
1473 * for multibyte types... the pointer is not aligned. Use
1474 * get_unaligned((type *)iterator.this_arg) to dereference
1475 * iterator.this_arg for type "type" safely on all arches.
1477 case IEEE80211_RADIOTAP_FLAGS
:
1478 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1480 * this indicates that the skb we have been
1481 * handed has the 32-bit FCS CRC at the end...
1482 * we should react to that by snipping it off
1483 * because it will be recomputed and added
1486 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1489 skb_trim(skb
, skb
->len
- FCS_LEN
);
1491 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1492 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1493 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
1494 info
->flags
&= ~IEEE80211_TX_CTL_DONTFRAG
;
1497 case IEEE80211_RADIOTAP_TX_FLAGS
:
1498 txflags
= get_unaligned_le16(iterator
.this_arg
);
1499 if (txflags
& IEEE80211_RADIOTAP_F_TX_NOACK
)
1500 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1504 * Please update the file
1505 * Documentation/networking/mac80211-injection.txt
1506 * when parsing new fields here.
1514 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1518 * remove the radiotap header
1519 * iterator->_max_length was sanity-checked against
1520 * skb->len by iterator init
1522 skb_pull(skb
, iterator
._max_length
);
1527 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1528 struct net_device
*dev
)
1530 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1531 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1532 struct ieee80211_radiotap_header
*prthdr
=
1533 (struct ieee80211_radiotap_header
*)skb
->data
;
1534 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1535 struct ieee80211_hdr
*hdr
;
1536 struct ieee80211_sub_if_data
*tmp_sdata
, *sdata
;
1541 * Frame injection is not allowed if beaconing is not allowed
1542 * or if we need radar detection. Beaconing is usually not allowed when
1543 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1544 * Passive scan is also used in world regulatory domains where
1545 * your country is not known and as such it should be treated as
1546 * NO TX unless the channel is explicitly allowed in which case
1547 * your current regulatory domain would not have the passive scan
1550 * Since AP mode uses monitor interfaces to inject/TX management
1551 * frames we can make AP mode the exception to this rule once it
1552 * supports radar detection as its implementation can deal with
1553 * radar detection by itself. We can do that later by adding a
1554 * monitor flag interfaces used for AP support.
1556 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1557 IEEE80211_CHAN_PASSIVE_SCAN
)))
1560 /* check for not even having the fixed radiotap header part */
1561 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1562 goto fail
; /* too short to be possibly valid */
1564 /* is it a header version we can trust to find length from? */
1565 if (unlikely(prthdr
->it_version
))
1566 goto fail
; /* only version 0 is supported */
1568 /* then there must be a radiotap header with a length we can use */
1569 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1571 /* does the skb contain enough to deliver on the alleged length? */
1572 if (unlikely(skb
->len
< len_rthdr
))
1573 goto fail
; /* skb too short for claimed rt header extent */
1576 * fix up the pointers accounting for the radiotap
1577 * header still being in there. We are being given
1578 * a precooked IEEE80211 header so no need for
1581 skb_set_mac_header(skb
, len_rthdr
);
1583 * these are just fixed to the end of the rt area since we
1584 * don't have any better information and at this point, nobody cares
1586 skb_set_network_header(skb
, len_rthdr
);
1587 skb_set_transport_header(skb
, len_rthdr
);
1589 if (skb
->len
< len_rthdr
+ 2)
1592 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1593 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1595 if (skb
->len
< len_rthdr
+ hdrlen
)
1599 * Initialize skb->protocol if the injected frame is a data frame
1600 * carrying a rfc1042 header
1602 if (ieee80211_is_data(hdr
->frame_control
) &&
1603 skb
->len
>= len_rthdr
+ hdrlen
+ sizeof(rfc1042_header
) + 2) {
1604 u8
*payload
= (u8
*)hdr
+ hdrlen
;
1606 if (compare_ether_addr(payload
, rfc1042_header
) == 0)
1607 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1611 memset(info
, 0, sizeof(*info
));
1613 info
->flags
= IEEE80211_TX_CTL_REQ_TX_STATUS
|
1614 IEEE80211_TX_CTL_INJECTED
;
1616 /* process and remove the injection radiotap header */
1617 if (!ieee80211_parse_tx_radiotap(skb
))
1623 * We process outgoing injected frames that have a local address
1624 * we handle as though they are non-injected frames.
1625 * This code here isn't entirely correct, the local MAC address
1626 * isn't always enough to find the interface to use; for proper
1627 * VLAN/WDS support we will need a different mechanism (which
1628 * likely isn't going to be monitor interfaces).
1630 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1632 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
, list
) {
1633 if (!ieee80211_sdata_running(tmp_sdata
))
1635 if (tmp_sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
1636 tmp_sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
||
1637 tmp_sdata
->vif
.type
== NL80211_IFTYPE_WDS
)
1639 if (compare_ether_addr(tmp_sdata
->vif
.addr
, hdr
->addr2
) == 0) {
1645 ieee80211_xmit(sdata
, skb
);
1648 return NETDEV_TX_OK
;
1652 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1656 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1657 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1658 * @skb: packet to be sent
1659 * @dev: incoming interface
1661 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1662 * not be freed, and caller is responsible for either retrying later or freeing
1665 * This function takes in an Ethernet header and encapsulates it with suitable
1666 * IEEE 802.11 header based on which interface the packet is coming in. The
1667 * encapsulated packet will then be passed to master interface, wlan#.11, for
1668 * transmission (through low-level driver).
1670 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1671 struct net_device
*dev
)
1673 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1674 struct ieee80211_local
*local
= sdata
->local
;
1675 struct ieee80211_tx_info
*info
;
1676 int ret
= NETDEV_TX_BUSY
, head_need
;
1677 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1679 struct ieee80211_hdr hdr
;
1680 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1681 struct mesh_path __maybe_unused
*mppath
= NULL
;
1682 const u8
*encaps_data
;
1683 int encaps_len
, skip_header_bytes
;
1685 struct sta_info
*sta
= NULL
;
1686 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1687 bool tdls_direct
= false;
1692 if (unlikely(skb
->len
< ETH_HLEN
)) {
1697 /* convert Ethernet header to proper 802.11 header (based on
1698 * operation mode) */
1699 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1700 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1702 switch (sdata
->vif
.type
) {
1703 case NL80211_IFTYPE_AP_VLAN
:
1705 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1707 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1709 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1710 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1711 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1712 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1714 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1715 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1721 case NL80211_IFTYPE_AP
:
1722 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1724 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1725 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1726 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1729 case NL80211_IFTYPE_WDS
:
1730 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1732 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1733 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1734 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1735 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1738 #ifdef CONFIG_MAC80211_MESH
1739 case NL80211_IFTYPE_MESH_POINT
:
1740 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1741 /* Do not send frames with mesh_ttl == 0 */
1742 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1747 if (!is_multicast_ether_addr(skb
->data
))
1748 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1751 * Use address extension if it is a packet from
1752 * another interface or if we know the destination
1753 * is being proxied by a portal (i.e. portal address
1754 * differs from proxied address)
1756 if (compare_ether_addr(sdata
->vif
.addr
,
1757 skb
->data
+ ETH_ALEN
) == 0 &&
1758 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1759 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1760 skb
->data
, skb
->data
+ ETH_ALEN
);
1762 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1765 int is_mesh_mcast
= 1;
1768 if (is_multicast_ether_addr(skb
->data
))
1769 /* DA TA mSA AE:SA */
1770 mesh_da
= skb
->data
;
1772 static const u8 bcast
[ETH_ALEN
] =
1773 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1775 /* RA TA mDA mSA AE:DA SA */
1776 mesh_da
= mppath
->mpp
;
1779 /* DA TA mSA AE:SA */
1783 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1784 mesh_da
, sdata
->vif
.addr
);
1788 ieee80211_new_mesh_header(&mesh_hdr
,
1790 skb
->data
+ ETH_ALEN
,
1794 ieee80211_new_mesh_header(&mesh_hdr
,
1797 skb
->data
+ ETH_ALEN
);
1802 case NL80211_IFTYPE_STATION
:
1803 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1804 bool tdls_peer
= false;
1807 sta
= sta_info_get(sdata
, skb
->data
);
1809 authorized
= test_sta_flag(sta
,
1810 WLAN_STA_AUTHORIZED
);
1811 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1812 tdls_peer
= test_sta_flag(sta
,
1813 WLAN_STA_TDLS_PEER
);
1814 tdls_auth
= test_sta_flag(sta
,
1815 WLAN_STA_TDLS_PEER_AUTH
);
1820 * If the TDLS link is enabled, send everything
1821 * directly. Otherwise, allow TDLS setup frames
1822 * to be transmitted indirectly.
1824 tdls_direct
= tdls_peer
&& (tdls_auth
||
1825 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1826 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1830 /* link during setup - throw out frames to peer */
1837 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1838 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1839 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1841 } else if (sdata
->u
.mgd
.use_4addr
&&
1842 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1843 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1844 IEEE80211_FCTL_TODS
);
1846 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1847 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1848 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1849 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1852 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1854 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1855 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1856 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1860 case NL80211_IFTYPE_ADHOC
:
1862 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1863 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1864 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1873 * There's no need to try to look up the destination
1874 * if it is a multicast address (which can only happen
1877 multicast
= is_multicast_ether_addr(hdr
.addr1
);
1880 sta
= sta_info_get(sdata
, hdr
.addr1
);
1882 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1883 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1888 /* For mesh, the use of the QoS header is mandatory */
1889 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1892 /* receiver and we are QoS enabled, use a QoS type frame */
1893 if (wme_sta
&& local
->hw
.queues
>= 4) {
1894 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1899 * Drop unicast frames to unauthorised stations unless they are
1900 * EAPOL frames from the local station.
1902 if (unlikely(!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1903 !is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1904 (cpu_to_be16(ethertype
) != sdata
->control_port_protocol
||
1905 compare_ether_addr(sdata
->vif
.addr
, skb
->data
+ ETH_ALEN
)))) {
1906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1907 if (net_ratelimit())
1908 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1909 " (unauthorized port)\n", dev
->name
,
1913 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1919 if (unlikely(!multicast
&& skb
->sk
&&
1920 skb_shinfo(skb
)->tx_flags
& SKBTX_WIFI_STATUS
)) {
1921 struct sk_buff
*orig_skb
= skb
;
1923 skb
= skb_clone(skb
, GFP_ATOMIC
);
1925 unsigned long flags
;
1928 spin_lock_irqsave(&local
->ack_status_lock
, flags
);
1929 r
= idr_get_new_above(&local
->ack_status_frames
,
1932 idr_pre_get(&local
->ack_status_frames
,
1934 r
= idr_get_new_above(&local
->ack_status_frames
,
1937 if (WARN_ON(!id
) || id
> 0xffff) {
1938 idr_remove(&local
->ack_status_frames
, id
);
1941 spin_unlock_irqrestore(&local
->ack_status_lock
, flags
);
1945 info_flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1946 } else if (skb_shared(skb
)) {
1947 kfree_skb(orig_skb
);
1953 /* couldn't clone -- lose tx status ... */
1959 * If the skb is shared we need to obtain our own copy.
1961 if (skb_shared(skb
)) {
1962 struct sk_buff
*tmp_skb
= skb
;
1964 /* can't happen -- skb is a clone if info_id != 0 */
1967 skb
= skb_clone(skb
, GFP_ATOMIC
);
1976 hdr
.frame_control
= fc
;
1977 hdr
.duration_id
= 0;
1980 skip_header_bytes
= ETH_HLEN
;
1981 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1982 encaps_data
= bridge_tunnel_header
;
1983 encaps_len
= sizeof(bridge_tunnel_header
);
1984 skip_header_bytes
-= 2;
1985 } else if (ethertype
>= 0x600) {
1986 encaps_data
= rfc1042_header
;
1987 encaps_len
= sizeof(rfc1042_header
);
1988 skip_header_bytes
-= 2;
1994 nh_pos
= skb_network_header(skb
) - skb
->data
;
1995 h_pos
= skb_transport_header(skb
) - skb
->data
;
1997 skb_pull(skb
, skip_header_bytes
);
1998 nh_pos
-= skip_header_bytes
;
1999 h_pos
-= skip_header_bytes
;
2001 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2004 * So we need to modify the skb header and hence need a copy of
2005 * that. The head_need variable above doesn't, so far, include
2006 * the needed header space that we don't need right away. If we
2007 * can, then we don't reallocate right now but only after the
2008 * frame arrives at the master device (if it does...)
2010 * If we cannot, however, then we will reallocate to include all
2011 * the ever needed space. Also, if we need to reallocate it anyway,
2012 * make it big enough for everything we may ever need.
2015 if (head_need
> 0 || skb_cloned(skb
)) {
2016 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2017 head_need
+= local
->tx_headroom
;
2018 head_need
= max_t(int, 0, head_need
);
2019 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2024 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2025 nh_pos
+= encaps_len
;
2026 h_pos
+= encaps_len
;
2029 #ifdef CONFIG_MAC80211_MESH
2030 if (meshhdrlen
> 0) {
2031 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2032 nh_pos
+= meshhdrlen
;
2033 h_pos
+= meshhdrlen
;
2037 if (ieee80211_is_data_qos(fc
)) {
2038 __le16
*qos_control
;
2040 qos_control
= (__le16
*) skb_push(skb
, 2);
2041 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2043 * Maybe we could actually set some fields here, for now just
2044 * initialise to zero to indicate no special operation.
2048 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2053 dev
->stats
.tx_packets
++;
2054 dev
->stats
.tx_bytes
+= skb
->len
;
2056 /* Update skb pointers to various headers since this modified frame
2057 * is going to go through Linux networking code that may potentially
2058 * need things like pointer to IP header. */
2059 skb_set_mac_header(skb
, 0);
2060 skb_set_network_header(skb
, nh_pos
);
2061 skb_set_transport_header(skb
, h_pos
);
2063 info
= IEEE80211_SKB_CB(skb
);
2064 memset(info
, 0, sizeof(*info
));
2066 dev
->trans_start
= jiffies
;
2068 info
->flags
= info_flags
;
2069 info
->ack_frame_id
= info_id
;
2071 ieee80211_xmit(sdata
, skb
);
2073 return NETDEV_TX_OK
;
2076 if (ret
== NETDEV_TX_OK
)
2084 * ieee80211_clear_tx_pending may not be called in a context where
2085 * it is possible that it packets could come in again.
2087 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2091 for (i
= 0; i
< local
->hw
.queues
; i
++)
2092 skb_queue_purge(&local
->pending
[i
]);
2096 * Returns false if the frame couldn't be transmitted but was queued instead,
2097 * which in this case means re-queued -- take as an indication to stop sending
2098 * more pending frames.
2100 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2101 struct sk_buff
*skb
)
2103 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2104 struct ieee80211_sub_if_data
*sdata
;
2105 struct sta_info
*sta
;
2106 struct ieee80211_hdr
*hdr
;
2109 sdata
= vif_to_sdata(info
->control
.vif
);
2111 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2112 result
= ieee80211_tx(sdata
, skb
, true);
2114 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2115 sta
= sta_info_get(sdata
, hdr
->addr1
);
2117 result
= __ieee80211_tx(local
, &skb
, sta
, true);
2124 * Transmit all pending packets. Called from tasklet.
2126 void ieee80211_tx_pending(unsigned long data
)
2128 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2129 struct ieee80211_sub_if_data
*sdata
;
2130 unsigned long flags
;
2136 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2137 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2139 * If queue is stopped by something other than due to pending
2140 * frames, or we have no pending frames, proceed to next queue.
2142 if (local
->queue_stop_reasons
[i
] ||
2143 skb_queue_empty(&local
->pending
[i
]))
2146 while (!skb_queue_empty(&local
->pending
[i
])) {
2147 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2148 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2150 if (WARN_ON(!info
->control
.vif
)) {
2155 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2158 txok
= ieee80211_tx_pending_skb(local
, skb
);
2159 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2165 if (skb_queue_empty(&local
->pending
[i
]))
2166 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2167 netif_wake_subqueue(sdata
->dev
, i
);
2169 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2174 /* functions for drivers to get certain frames */
2176 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2177 struct sk_buff
*skb
,
2178 struct beacon_data
*beacon
)
2182 int i
, have_bits
= 0, n1
, n2
;
2184 /* Generate bitmap for TIM only if there are any STAs in power save
2186 if (atomic_read(&bss
->num_sta_ps
) > 0)
2187 /* in the hope that this is faster than
2188 * checking byte-for-byte */
2189 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2190 IEEE80211_MAX_AID
+1);
2192 if (bss
->dtim_count
== 0)
2193 bss
->dtim_count
= beacon
->dtim_period
- 1;
2197 tim
= pos
= (u8
*) skb_put(skb
, 6);
2198 *pos
++ = WLAN_EID_TIM
;
2200 *pos
++ = bss
->dtim_count
;
2201 *pos
++ = beacon
->dtim_period
;
2203 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2206 bss
->dtim_bc_mc
= aid0
== 1;
2209 /* Find largest even number N1 so that bits numbered 1 through
2210 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2211 * (N2 + 1) x 8 through 2007 are 0. */
2213 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2220 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2227 /* Bitmap control */
2229 /* Part Virt Bitmap */
2230 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2232 tim
[1] = n2
- n1
+ 4;
2233 skb_put(skb
, n2
- n1
);
2235 *pos
++ = aid0
; /* Bitmap control */
2236 *pos
++ = 0; /* Part Virt Bitmap */
2240 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2241 struct ieee80211_vif
*vif
,
2242 u16
*tim_offset
, u16
*tim_length
)
2244 struct ieee80211_local
*local
= hw_to_local(hw
);
2245 struct sk_buff
*skb
= NULL
;
2246 struct ieee80211_tx_info
*info
;
2247 struct ieee80211_sub_if_data
*sdata
= NULL
;
2248 struct ieee80211_if_ap
*ap
= NULL
;
2249 struct beacon_data
*beacon
;
2250 struct ieee80211_supported_band
*sband
;
2251 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2252 struct ieee80211_tx_rate_control txrc
;
2254 sband
= local
->hw
.wiphy
->bands
[band
];
2258 sdata
= vif_to_sdata(vif
);
2260 if (!ieee80211_sdata_running(sdata
))
2268 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2270 beacon
= rcu_dereference(ap
->beacon
);
2273 * headroom, head length,
2274 * tail length and maximum TIM length
2276 skb
= dev_alloc_skb(local
->tx_headroom
+
2278 beacon
->tail_len
+ 256);
2282 skb_reserve(skb
, local
->tx_headroom
);
2283 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2287 * Not very nice, but we want to allow the driver to call
2288 * ieee80211_beacon_get() as a response to the set_tim()
2289 * callback. That, however, is already invoked under the
2290 * sta_lock to guarantee consistent and race-free update
2291 * of the tim bitmap in mac80211 and the driver.
2293 if (local
->tim_in_locked_section
) {
2294 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2296 unsigned long flags
;
2298 spin_lock_irqsave(&local
->sta_lock
, flags
);
2299 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2300 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2304 *tim_offset
= beacon
->head_len
;
2306 *tim_length
= skb
->len
- beacon
->head_len
;
2309 memcpy(skb_put(skb
, beacon
->tail_len
),
2310 beacon
->tail
, beacon
->tail_len
);
2313 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2314 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2315 struct ieee80211_hdr
*hdr
;
2316 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2321 skb
= skb_copy(presp
, GFP_ATOMIC
);
2325 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2326 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2327 IEEE80211_STYPE_BEACON
);
2328 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2329 struct ieee80211_mgmt
*mgmt
;
2331 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.beacon
) +
2332 sizeof(mgmt
->u
.beacon
);
2334 #ifdef CONFIG_MAC80211_MESH
2335 if (!sdata
->u
.mesh
.mesh_id_len
)
2339 skb
= dev_alloc_skb(local
->tx_headroom
+
2342 2 + 8 + /* supported rates */
2343 2 + 3 + /* DS params */
2344 2 + (IEEE80211_MAX_SUPP_RATES
- 8) +
2345 2 + sizeof(struct ieee80211_ht_cap
) +
2346 2 + sizeof(struct ieee80211_ht_info
) +
2347 2 + sdata
->u
.mesh
.mesh_id_len
+
2348 2 + sizeof(struct ieee80211_meshconf_ie
) +
2349 sdata
->u
.mesh
.ie_len
);
2353 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2354 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
2355 memset(mgmt
, 0, hdr_len
);
2356 mgmt
->frame_control
=
2357 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2358 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2359 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2360 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2361 mgmt
->u
.beacon
.beacon_int
=
2362 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2363 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2364 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2366 pos
= skb_put(skb
, 2);
2367 *pos
++ = WLAN_EID_SSID
;
2370 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
) ||
2371 mesh_add_ds_params_ie(skb
, sdata
) ||
2372 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
) ||
2373 mesh_add_rsn_ie(skb
, sdata
) ||
2374 mesh_add_ht_cap_ie(skb
, sdata
) ||
2375 mesh_add_ht_info_ie(skb
, sdata
) ||
2376 mesh_add_meshid_ie(skb
, sdata
) ||
2377 mesh_add_meshconf_ie(skb
, sdata
) ||
2378 mesh_add_vendor_ies(skb
, sdata
)) {
2379 pr_err("o11s: couldn't add ies!\n");
2387 info
= IEEE80211_SKB_CB(skb
);
2389 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2390 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2393 memset(&txrc
, 0, sizeof(txrc
));
2396 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2398 txrc
.reported_rate
.idx
= -1;
2399 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2400 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2401 txrc
.max_rate_idx
= -1;
2403 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2405 rate_control_get_rate(sdata
, NULL
, &txrc
);
2407 info
->control
.vif
= vif
;
2409 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2410 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2411 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2416 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2418 struct sk_buff
*ieee80211_proberesp_get(struct ieee80211_hw
*hw
,
2419 struct ieee80211_vif
*vif
)
2421 struct ieee80211_if_ap
*ap
= NULL
;
2422 struct sk_buff
*presp
= NULL
, *skb
= NULL
;
2423 struct ieee80211_hdr
*hdr
;
2424 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
2426 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2432 presp
= rcu_dereference(ap
->probe_resp
);
2436 skb
= skb_copy(presp
, GFP_ATOMIC
);
2440 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2441 memset(hdr
->addr1
, 0, sizeof(hdr
->addr1
));
2447 EXPORT_SYMBOL(ieee80211_proberesp_get
);
2449 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2450 struct ieee80211_vif
*vif
)
2452 struct ieee80211_sub_if_data
*sdata
;
2453 struct ieee80211_if_managed
*ifmgd
;
2454 struct ieee80211_pspoll
*pspoll
;
2455 struct ieee80211_local
*local
;
2456 struct sk_buff
*skb
;
2458 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2461 sdata
= vif_to_sdata(vif
);
2462 ifmgd
= &sdata
->u
.mgd
;
2463 local
= sdata
->local
;
2465 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2469 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2471 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2472 memset(pspoll
, 0, sizeof(*pspoll
));
2473 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2474 IEEE80211_STYPE_PSPOLL
);
2475 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2477 /* aid in PS-Poll has its two MSBs each set to 1 */
2478 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2480 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2481 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2485 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2487 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2488 struct ieee80211_vif
*vif
)
2490 struct ieee80211_hdr_3addr
*nullfunc
;
2491 struct ieee80211_sub_if_data
*sdata
;
2492 struct ieee80211_if_managed
*ifmgd
;
2493 struct ieee80211_local
*local
;
2494 struct sk_buff
*skb
;
2496 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2499 sdata
= vif_to_sdata(vif
);
2500 ifmgd
= &sdata
->u
.mgd
;
2501 local
= sdata
->local
;
2503 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2507 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2509 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2511 memset(nullfunc
, 0, sizeof(*nullfunc
));
2512 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2513 IEEE80211_STYPE_NULLFUNC
|
2514 IEEE80211_FCTL_TODS
);
2515 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2516 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2517 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2521 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2523 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2524 struct ieee80211_vif
*vif
,
2525 const u8
*ssid
, size_t ssid_len
,
2526 const u8
*ie
, size_t ie_len
)
2528 struct ieee80211_sub_if_data
*sdata
;
2529 struct ieee80211_local
*local
;
2530 struct ieee80211_hdr_3addr
*hdr
;
2531 struct sk_buff
*skb
;
2535 sdata
= vif_to_sdata(vif
);
2536 local
= sdata
->local
;
2537 ie_ssid_len
= 2 + ssid_len
;
2539 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2540 ie_ssid_len
+ ie_len
);
2544 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2546 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2547 memset(hdr
, 0, sizeof(*hdr
));
2548 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2549 IEEE80211_STYPE_PROBE_REQ
);
2550 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2551 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2552 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2554 pos
= skb_put(skb
, ie_ssid_len
);
2555 *pos
++ = WLAN_EID_SSID
;
2558 memcpy(pos
, ssid
, ssid_len
);
2562 pos
= skb_put(skb
, ie_len
);
2563 memcpy(pos
, ie
, ie_len
);
2568 EXPORT_SYMBOL(ieee80211_probereq_get
);
2570 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2571 const void *frame
, size_t frame_len
,
2572 const struct ieee80211_tx_info
*frame_txctl
,
2573 struct ieee80211_rts
*rts
)
2575 const struct ieee80211_hdr
*hdr
= frame
;
2577 rts
->frame_control
=
2578 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2579 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2581 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2582 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2584 EXPORT_SYMBOL(ieee80211_rts_get
);
2586 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2587 const void *frame
, size_t frame_len
,
2588 const struct ieee80211_tx_info
*frame_txctl
,
2589 struct ieee80211_cts
*cts
)
2591 const struct ieee80211_hdr
*hdr
= frame
;
2593 cts
->frame_control
=
2594 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2595 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2596 frame_len
, frame_txctl
);
2597 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2599 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2602 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2603 struct ieee80211_vif
*vif
)
2605 struct ieee80211_local
*local
= hw_to_local(hw
);
2606 struct sk_buff
*skb
= NULL
;
2607 struct ieee80211_tx_data tx
;
2608 struct ieee80211_sub_if_data
*sdata
;
2609 struct ieee80211_if_ap
*bss
= NULL
;
2610 struct beacon_data
*beacon
;
2611 struct ieee80211_tx_info
*info
;
2613 sdata
= vif_to_sdata(vif
);
2617 beacon
= rcu_dereference(bss
->beacon
);
2619 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2622 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2623 goto out
; /* send buffered bc/mc only after DTIM beacon */
2626 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2629 local
->total_ps_buffered
--;
2631 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2632 struct ieee80211_hdr
*hdr
=
2633 (struct ieee80211_hdr
*) skb
->data
;
2634 /* more buffered multicast/broadcast frames ==> set
2635 * MoreData flag in IEEE 802.11 header to inform PS
2637 hdr
->frame_control
|=
2638 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2641 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2643 dev_kfree_skb_any(skb
);
2646 info
= IEEE80211_SKB_CB(skb
);
2648 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2649 tx
.channel
= local
->hw
.conf
.channel
;
2650 info
->band
= tx
.channel
->band
;
2652 if (invoke_tx_handlers(&tx
))
2659 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2661 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2663 skb_set_mac_header(skb
, 0);
2664 skb_set_network_header(skb
, 0);
2665 skb_set_transport_header(skb
, 0);
2667 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2668 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
2672 * The other path calling ieee80211_xmit is from the tasklet,
2673 * and while we can handle concurrent transmissions locking
2674 * requirements are that we do not come into tx with bhs on.
2677 ieee80211_xmit(sdata
, skb
);