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)
808 * Anything but QoS data that has a sequence number field
809 * (is long enough) gets a sequence number from the global
812 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
813 /* driver should assign sequence number */
814 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
815 /* for pure STA mode without beacons, we can do it */
816 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
817 tx
->sdata
->sequence_number
+= 0x10;
822 * This should be true for injected/management frames only, for
823 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
824 * above since they are not QoS-data frames.
829 /* include per-STA, per-TID sequence counter */
831 qc
= ieee80211_get_qos_ctl(hdr
);
832 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
833 seq
= &tx
->sta
->tid_seq
[tid
];
835 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
837 /* Increase the sequence number. */
838 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
843 static int ieee80211_fragment(struct ieee80211_local
*local
,
844 struct sk_buff
*skb
, int hdrlen
,
847 struct sk_buff
*tail
= skb
, *tmp
;
848 int per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
849 int pos
= hdrlen
+ per_fragm
;
850 int rem
= skb
->len
- hdrlen
- per_fragm
;
852 if (WARN_ON(rem
< 0))
856 int fraglen
= per_fragm
;
861 tmp
= dev_alloc_skb(local
->tx_headroom
+
863 IEEE80211_ENCRYPT_HEADROOM
+
864 IEEE80211_ENCRYPT_TAILROOM
);
869 skb_reserve(tmp
, local
->tx_headroom
+
870 IEEE80211_ENCRYPT_HEADROOM
);
871 /* copy control information */
872 memcpy(tmp
->cb
, skb
->cb
, sizeof(tmp
->cb
));
873 skb_copy_queue_mapping(tmp
, skb
);
874 tmp
->priority
= skb
->priority
;
877 /* copy header and data */
878 memcpy(skb_put(tmp
, hdrlen
), skb
->data
, hdrlen
);
879 memcpy(skb_put(tmp
, fraglen
), skb
->data
+ pos
, fraglen
);
884 skb
->len
= hdrlen
+ per_fragm
;
888 static ieee80211_tx_result debug_noinline
889 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
891 struct sk_buff
*skb
= tx
->skb
;
892 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
893 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
894 int frag_threshold
= tx
->local
->hw
.wiphy
->frag_threshold
;
898 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
902 * Warn when submitting a fragmented A-MPDU frame and drop it.
903 * This scenario is handled in ieee80211_tx_prepare but extra
904 * caution taken here as fragmented ampdu may cause Tx stop.
906 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
909 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
911 /* internal error, why is TX_FRAGMENTED set? */
912 if (WARN_ON(skb
->len
+ FCS_LEN
<= frag_threshold
))
916 * Now fragment the frame. This will allocate all the fragments and
917 * chain them (using skb as the first fragment) to skb->next.
918 * During transmission, we will remove the successfully transmitted
919 * fragments from this list. When the low-level driver rejects one
920 * of the fragments then we will simply pretend to accept the skb
921 * but store it away as pending.
923 if (ieee80211_fragment(tx
->local
, skb
, hdrlen
, frag_threshold
))
926 /* update duration/seq/flags of fragments */
930 const __le16 morefrags
= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
932 hdr
= (void *)skb
->data
;
933 info
= IEEE80211_SKB_CB(skb
);
936 hdr
->frame_control
|= morefrags
;
937 next_len
= skb
->next
->len
;
939 * No multi-rate retries for fragmented frames, that
940 * would completely throw off the NAV at other STAs.
942 info
->control
.rates
[1].idx
= -1;
943 info
->control
.rates
[2].idx
= -1;
944 info
->control
.rates
[3].idx
= -1;
945 info
->control
.rates
[4].idx
= -1;
946 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
947 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
949 hdr
->frame_control
&= ~morefrags
;
952 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
953 hdr
->seq_ctrl
|= cpu_to_le16(fragnum
& IEEE80211_SCTL_FRAG
);
955 } while ((skb
= skb
->next
));
960 static ieee80211_tx_result debug_noinline
961 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
963 struct sk_buff
*skb
= tx
->skb
;
968 tx
->sta
->tx_packets
++;
970 tx
->sta
->tx_fragments
++;
971 tx
->sta
->tx_bytes
+= skb
->len
;
972 } while ((skb
= skb
->next
));
977 static ieee80211_tx_result debug_noinline
978 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
980 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
985 switch (tx
->key
->conf
.cipher
) {
986 case WLAN_CIPHER_SUITE_WEP40
:
987 case WLAN_CIPHER_SUITE_WEP104
:
988 return ieee80211_crypto_wep_encrypt(tx
);
989 case WLAN_CIPHER_SUITE_TKIP
:
990 return ieee80211_crypto_tkip_encrypt(tx
);
991 case WLAN_CIPHER_SUITE_CCMP
:
992 return ieee80211_crypto_ccmp_encrypt(tx
);
993 case WLAN_CIPHER_SUITE_AES_CMAC
:
994 return ieee80211_crypto_aes_cmac_encrypt(tx
);
996 /* handle hw-only algorithm */
997 if (info
->control
.hw_key
) {
998 ieee80211_tx_set_protected(tx
);
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
1011 struct sk_buff
*skb
= tx
->skb
;
1012 struct ieee80211_hdr
*hdr
;
1017 hdr
= (void *) skb
->data
;
1018 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
)))
1019 break; /* must not overwrite AID */
1020 next_len
= skb
->next
? skb
->next
->len
: 0;
1021 group_addr
= is_multicast_ether_addr(hdr
->addr1
);
1024 ieee80211_duration(tx
, group_addr
, next_len
);
1025 } while ((skb
= skb
->next
));
1030 /* actual transmit path */
1033 * deal with packet injection down monitor interface
1034 * with Radiotap Header -- only called for monitor mode interface
1036 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
1037 struct sk_buff
*skb
)
1040 * this is the moment to interpret and discard the radiotap header that
1041 * must be at the start of the packet injected in Monitor mode
1043 * Need to take some care with endian-ness since radiotap
1044 * args are little-endian
1047 struct ieee80211_radiotap_iterator iterator
;
1048 struct ieee80211_radiotap_header
*rthdr
=
1049 (struct ieee80211_radiotap_header
*) skb
->data
;
1051 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1052 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
,
1055 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1056 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1058 /* packet is fragmented in HW if we have a non-NULL driver callback */
1059 hw_frag
= (tx
->local
->ops
->set_frag_threshold
!= NULL
);
1062 * for every radiotap entry that is present
1063 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1064 * entries present, or -EINVAL on error)
1068 ret
= ieee80211_radiotap_iterator_next(&iterator
);
1073 /* see if this argument is something we can use */
1074 switch (iterator
.this_arg_index
) {
1076 * You must take care when dereferencing iterator.this_arg
1077 * for multibyte types... the pointer is not aligned. Use
1078 * get_unaligned((type *)iterator.this_arg) to dereference
1079 * iterator.this_arg for type "type" safely on all arches.
1081 case IEEE80211_RADIOTAP_FLAGS
:
1082 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
1084 * this indicates that the skb we have been
1085 * handed has the 32-bit FCS CRC at the end...
1086 * we should react to that by snipping it off
1087 * because it will be recomputed and added
1090 if (skb
->len
< (iterator
._max_length
+ FCS_LEN
))
1093 skb_trim(skb
, skb
->len
- FCS_LEN
);
1095 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
1096 info
->flags
&= ~IEEE80211_TX_INTFL_DONT_ENCRYPT
;
1097 if ((*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
) &&
1099 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1103 * Please update the file
1104 * Documentation/networking/mac80211-injection.txt
1105 * when parsing new fields here.
1113 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
1117 * remove the radiotap header
1118 * iterator->_max_length was sanity-checked against
1119 * skb->len by iterator init
1121 skb_pull(skb
, iterator
._max_length
);
1126 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data
*tx
,
1127 struct sk_buff
*skb
,
1128 struct ieee80211_tx_info
*info
,
1129 struct tid_ampdu_tx
*tid_tx
,
1132 bool queued
= false;
1134 if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1135 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1136 } else if (test_bit(HT_AGG_STATE_WANT_START
, &tid_tx
->state
)) {
1138 * nothing -- this aggregation session is being started
1139 * but that might still fail with the driver
1142 spin_lock(&tx
->sta
->lock
);
1144 * Need to re-check now, because we may get here
1146 * 1) in the window during which the setup is actually
1147 * already done, but not marked yet because not all
1148 * packets are spliced over to the driver pending
1149 * queue yet -- if this happened we acquire the lock
1150 * either before or after the splice happens, but
1151 * need to recheck which of these cases happened.
1153 * 2) during session teardown, if the OPERATIONAL bit
1154 * was cleared due to the teardown but the pointer
1155 * hasn't been assigned NULL yet (or we loaded it
1156 * before it was assigned) -- in this case it may
1157 * now be NULL which means we should just let the
1158 * packet pass through because splicing the frames
1159 * back is already done.
1161 tid_tx
= rcu_dereference_protected_tid_tx(tx
->sta
, tid
);
1164 /* do nothing, let packet pass through */
1165 } else if (test_bit(HT_AGG_STATE_OPERATIONAL
, &tid_tx
->state
)) {
1166 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
1169 info
->control
.vif
= &tx
->sdata
->vif
;
1170 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1171 __skb_queue_tail(&tid_tx
->pending
, skb
);
1173 spin_unlock(&tx
->sta
->lock
);
1182 static ieee80211_tx_result
1183 ieee80211_tx_prepare(struct ieee80211_sub_if_data
*sdata
,
1184 struct ieee80211_tx_data
*tx
,
1185 struct sk_buff
*skb
)
1187 struct ieee80211_local
*local
= sdata
->local
;
1188 struct ieee80211_hdr
*hdr
;
1189 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1193 memset(tx
, 0, sizeof(*tx
));
1197 tx
->channel
= local
->hw
.conf
.channel
;
1199 * Set this flag (used below to indicate "automatic fragmentation"),
1200 * it will be cleared/left by radiotap as desired.
1201 * Only valid when fragmentation is done by the stack.
1203 if (!local
->ops
->set_frag_threshold
)
1204 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1206 /* process and remove the injection radiotap header */
1207 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_HAS_RADIOTAP
)) {
1208 if (!__ieee80211_parse_tx_radiotap(tx
, skb
))
1212 * __ieee80211_parse_tx_radiotap has now removed
1213 * the radiotap header that was present and pre-filled
1214 * 'tx' with tx control information.
1216 info
->flags
&= ~IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1220 * If this flag is set to true anywhere, and we get here,
1221 * we are doing the needed processing, so remove the flag
1224 info
->flags
&= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1226 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1228 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
1229 tx
->sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1230 if (!tx
->sta
&& sdata
->dev
->ieee80211_ptr
->use_4addr
)
1232 } else if (info
->flags
& IEEE80211_TX_CTL_INJECTED
) {
1233 tx
->sta
= sta_info_get_bss(sdata
, hdr
->addr1
);
1236 tx
->sta
= sta_info_get(sdata
, hdr
->addr1
);
1238 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
) &&
1239 (local
->hw
.flags
& IEEE80211_HW_AMPDU_AGGREGATION
) &&
1240 !(local
->hw
.flags
& IEEE80211_HW_TX_AMPDU_SETUP_IN_HW
)) {
1241 struct tid_ampdu_tx
*tid_tx
;
1243 qc
= ieee80211_get_qos_ctl(hdr
);
1244 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
1246 tid_tx
= rcu_dereference(tx
->sta
->ampdu_mlme
.tid_tx
[tid
]);
1250 queued
= ieee80211_tx_prep_agg(tx
, skb
, info
,
1253 if (unlikely(queued
))
1258 if (is_multicast_ether_addr(hdr
->addr1
)) {
1259 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
1260 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1262 tx
->flags
|= IEEE80211_TX_UNICAST
;
1263 if (unlikely(local
->wifi_wme_noack_test
))
1264 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1266 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1269 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1270 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1271 skb
->len
+ FCS_LEN
> local
->hw
.wiphy
->frag_threshold
&&
1272 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1273 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1275 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1279 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1280 else if (test_and_clear_sta_flag(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1281 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1283 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1284 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1285 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1286 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1288 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1294 * Returns false if the frame couldn't be transmitted but was queued instead.
1296 static bool __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
**skbp
,
1297 struct sta_info
*sta
, bool txpending
)
1299 struct sk_buff
*skb
= *skbp
, *next
;
1300 struct ieee80211_tx_info
*info
;
1301 struct ieee80211_sub_if_data
*sdata
;
1302 unsigned long flags
;
1307 int q
= skb_get_queue_mapping(skb
);
1310 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
1311 if (local
->queue_stop_reasons
[q
] ||
1312 (!txpending
&& !skb_queue_empty(&local
->pending
[q
]))) {
1314 * Since queue is stopped, queue up frames for later
1315 * transmission from the tx-pending tasklet when the
1316 * queue is woken again.
1323 * NB: If txpending is true, next must already
1324 * be NULL since we must've gone through this
1325 * loop before already; therefore we can just
1326 * queue the frame to the head without worrying
1327 * about reordering of fragments.
1329 if (unlikely(txpending
))
1330 __skb_queue_head(&local
->pending
[q
],
1333 __skb_queue_tail(&local
->pending
[q
],
1335 } while ((skb
= next
));
1337 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
1341 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
1343 info
= IEEE80211_SKB_CB(skb
);
1346 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1347 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1353 info
->flags
|= IEEE80211_TX_CTL_MORE_FRAMES
;
1355 sdata
= vif_to_sdata(info
->control
.vif
);
1357 switch (sdata
->vif
.type
) {
1358 case NL80211_IFTYPE_MONITOR
:
1359 info
->control
.vif
= NULL
;
1361 case NL80211_IFTYPE_AP_VLAN
:
1362 info
->control
.vif
= &container_of(sdata
->bss
,
1363 struct ieee80211_sub_if_data
, u
.ap
)->vif
;
1370 if (sta
&& sta
->uploaded
)
1371 info
->control
.sta
= &sta
->sta
;
1373 info
->control
.sta
= NULL
;
1375 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
1378 ieee80211_tpt_led_trig_tx(local
, fc
, len
);
1380 ieee80211_led_tx(local
, 1);
1388 * Invoke TX handlers, return 0 on success and non-zero if the
1389 * frame was dropped or queued.
1391 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1393 struct sk_buff
*skb
= tx
->skb
;
1394 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1395 ieee80211_tx_result res
= TX_DROP
;
1397 #define CALL_TXH(txh) \
1400 if (res != TX_CONTINUE) \
1404 CALL_TXH(ieee80211_tx_h_dynamic_ps
);
1405 CALL_TXH(ieee80211_tx_h_check_assoc
);
1406 CALL_TXH(ieee80211_tx_h_ps_buf
);
1407 CALL_TXH(ieee80211_tx_h_check_control_port_protocol
);
1408 CALL_TXH(ieee80211_tx_h_select_key
);
1409 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1410 CALL_TXH(ieee80211_tx_h_rate_ctrl
);
1412 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_RETRANSMISSION
))
1415 CALL_TXH(ieee80211_tx_h_michael_mic_add
);
1416 CALL_TXH(ieee80211_tx_h_sequence
);
1417 CALL_TXH(ieee80211_tx_h_fragment
);
1418 /* handlers after fragment must be aware of tx info fragmentation! */
1419 CALL_TXH(ieee80211_tx_h_stats
);
1420 CALL_TXH(ieee80211_tx_h_encrypt
);
1421 if (!(tx
->local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
))
1422 CALL_TXH(ieee80211_tx_h_calculate_duration
);
1426 if (unlikely(res
== TX_DROP
)) {
1427 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1429 struct sk_buff
*next
;
1436 } else if (unlikely(res
== TX_QUEUED
)) {
1437 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1445 * Returns false if the frame couldn't be transmitted but was queued instead.
1447 static bool ieee80211_tx(struct ieee80211_sub_if_data
*sdata
,
1448 struct sk_buff
*skb
, bool txpending
)
1450 struct ieee80211_local
*local
= sdata
->local
;
1451 struct ieee80211_tx_data tx
;
1452 ieee80211_tx_result res_prepare
;
1453 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1456 if (unlikely(skb
->len
< 10)) {
1463 /* initialises tx */
1464 res_prepare
= ieee80211_tx_prepare(sdata
, &tx
, skb
);
1466 if (unlikely(res_prepare
== TX_DROP
)) {
1469 } else if (unlikely(res_prepare
== TX_QUEUED
)) {
1473 tx
.channel
= local
->hw
.conf
.channel
;
1474 info
->band
= tx
.channel
->band
;
1476 if (!invoke_tx_handlers(&tx
))
1477 result
= __ieee80211_tx(local
, &tx
.skb
, tx
.sta
, txpending
);
1483 /* device xmit handlers */
1485 static int ieee80211_skb_resize(struct ieee80211_sub_if_data
*sdata
,
1486 struct sk_buff
*skb
,
1487 int head_need
, bool may_encrypt
)
1489 struct ieee80211_local
*local
= sdata
->local
;
1492 if (may_encrypt
&& sdata
->crypto_tx_tailroom_needed_cnt
) {
1493 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1494 tail_need
-= skb_tailroom(skb
);
1495 tail_need
= max_t(int, tail_need
, 0);
1498 if (head_need
|| tail_need
) {
1499 /* Sorry. Can't account for this any more */
1503 if (skb_cloned(skb
))
1504 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1505 else if (head_need
|| tail_need
)
1506 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1510 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1511 wiphy_debug(local
->hw
.wiphy
,
1512 "failed to reallocate TX buffer\n");
1516 /* update truesize too */
1517 skb
->truesize
+= head_need
+ tail_need
;
1522 void ieee80211_xmit(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
1524 struct ieee80211_local
*local
= sdata
->local
;
1525 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1526 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1527 struct ieee80211_sub_if_data
*tmp_sdata
;
1533 if (unlikely(sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1537 info
->flags
|= IEEE80211_TX_CTL_INJECTED
|
1538 IEEE80211_TX_INTFL_HAS_RADIOTAP
;
1540 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1541 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1542 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1544 /* check the header is complete in the frame */
1545 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1547 * We process outgoing injected frames that have a
1548 * local address we handle as though they are our
1550 * This code here isn't entirely correct, the local
1551 * MAC address is not necessarily enough to find
1552 * the interface to use; for that proper VLAN/WDS
1553 * support we will need a different mechanism.
1556 list_for_each_entry_rcu(tmp_sdata
, &local
->interfaces
,
1558 if (!ieee80211_sdata_running(tmp_sdata
))
1560 if (tmp_sdata
->vif
.type
==
1561 NL80211_IFTYPE_MONITOR
||
1562 tmp_sdata
->vif
.type
==
1563 NL80211_IFTYPE_AP_VLAN
||
1564 tmp_sdata
->vif
.type
==
1567 if (compare_ether_addr(tmp_sdata
->vif
.addr
,
1576 may_encrypt
= !(info
->flags
& IEEE80211_TX_INTFL_DONT_ENCRYPT
);
1578 headroom
= local
->tx_headroom
;
1580 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1581 headroom
-= skb_headroom(skb
);
1582 headroom
= max_t(int, 0, headroom
);
1584 if (ieee80211_skb_resize(sdata
, skb
, headroom
, may_encrypt
)) {
1590 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1591 info
->control
.vif
= &sdata
->vif
;
1593 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
1594 ieee80211_is_data(hdr
->frame_control
) &&
1595 !is_multicast_ether_addr(hdr
->addr1
))
1596 if (mesh_nexthop_lookup(skb
, sdata
)) {
1597 /* skb queued: don't free */
1602 ieee80211_set_qos_hdr(sdata
, skb
);
1603 ieee80211_tx(sdata
, skb
, false);
1607 netdev_tx_t
ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1608 struct net_device
*dev
)
1610 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1611 struct ieee80211_channel
*chan
= local
->hw
.conf
.channel
;
1612 struct ieee80211_radiotap_header
*prthdr
=
1613 (struct ieee80211_radiotap_header
*)skb
->data
;
1614 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1615 struct ieee80211_hdr
*hdr
;
1620 * Frame injection is not allowed if beaconing is not allowed
1621 * or if we need radar detection. Beaconing is usually not allowed when
1622 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1623 * Passive scan is also used in world regulatory domains where
1624 * your country is not known and as such it should be treated as
1625 * NO TX unless the channel is explicitly allowed in which case
1626 * your current regulatory domain would not have the passive scan
1629 * Since AP mode uses monitor interfaces to inject/TX management
1630 * frames we can make AP mode the exception to this rule once it
1631 * supports radar detection as its implementation can deal with
1632 * radar detection by itself. We can do that later by adding a
1633 * monitor flag interfaces used for AP support.
1635 if ((chan
->flags
& (IEEE80211_CHAN_NO_IBSS
| IEEE80211_CHAN_RADAR
|
1636 IEEE80211_CHAN_PASSIVE_SCAN
)))
1639 /* check for not even having the fixed radiotap header part */
1640 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1641 goto fail
; /* too short to be possibly valid */
1643 /* is it a header version we can trust to find length from? */
1644 if (unlikely(prthdr
->it_version
))
1645 goto fail
; /* only version 0 is supported */
1647 /* then there must be a radiotap header with a length we can use */
1648 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1650 /* does the skb contain enough to deliver on the alleged length? */
1651 if (unlikely(skb
->len
< len_rthdr
))
1652 goto fail
; /* skb too short for claimed rt header extent */
1655 * fix up the pointers accounting for the radiotap
1656 * header still being in there. We are being given
1657 * a precooked IEEE80211 header so no need for
1660 skb_set_mac_header(skb
, len_rthdr
);
1662 * these are just fixed to the end of the rt area since we
1663 * don't have any better information and at this point, nobody cares
1665 skb_set_network_header(skb
, len_rthdr
);
1666 skb_set_transport_header(skb
, len_rthdr
);
1669 * Initialize skb->protocol if the injected frame is a data frame
1670 * carrying a rfc1042 header
1672 if (skb
->len
> len_rthdr
+ 2) {
1673 hdr
= (struct ieee80211_hdr
*)(skb
->data
+ len_rthdr
);
1674 if (ieee80211_is_data(hdr
->frame_control
) &&
1675 skb
->len
>= len_rthdr
+
1676 ieee80211_hdrlen(hdr
->frame_control
) +
1677 sizeof(rfc1042_header
) + 2) {
1678 payload
= (u8
*)hdr
+
1679 ieee80211_hdrlen(hdr
->frame_control
);
1680 if (compare_ether_addr(payload
, rfc1042_header
) == 0)
1681 skb
->protocol
= cpu_to_be16((payload
[6] << 8) |
1686 memset(info
, 0, sizeof(*info
));
1688 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1690 /* pass the radiotap header up to xmit */
1691 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev
), skb
);
1692 return NETDEV_TX_OK
;
1696 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1700 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1701 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1702 * @skb: packet to be sent
1703 * @dev: incoming interface
1705 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1706 * not be freed, and caller is responsible for either retrying later or freeing
1709 * This function takes in an Ethernet header and encapsulates it with suitable
1710 * IEEE 802.11 header based on which interface the packet is coming in. The
1711 * encapsulated packet will then be passed to master interface, wlan#.11, for
1712 * transmission (through low-level driver).
1714 netdev_tx_t
ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1715 struct net_device
*dev
)
1717 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1718 struct ieee80211_local
*local
= sdata
->local
;
1719 struct ieee80211_tx_info
*info
;
1720 int ret
= NETDEV_TX_BUSY
, head_need
;
1721 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1723 struct ieee80211_hdr hdr
;
1724 struct ieee80211s_hdr mesh_hdr __maybe_unused
;
1725 struct mesh_path __maybe_unused
*mppath
= NULL
;
1726 const u8
*encaps_data
;
1727 int encaps_len
, skip_header_bytes
;
1729 struct sta_info
*sta
= NULL
;
1730 bool wme_sta
= false, authorized
= false, tdls_auth
= false;
1731 struct sk_buff
*tmp_skb
;
1732 bool tdls_direct
= false;
1734 if (unlikely(skb
->len
< ETH_HLEN
)) {
1739 /* convert Ethernet header to proper 802.11 header (based on
1740 * operation mode) */
1741 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1742 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1744 switch (sdata
->vif
.type
) {
1745 case NL80211_IFTYPE_AP_VLAN
:
1747 sta
= rcu_dereference(sdata
->u
.vlan
.sta
);
1749 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1751 memcpy(hdr
.addr1
, sta
->sta
.addr
, ETH_ALEN
);
1752 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1753 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1754 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1756 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1757 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1763 case NL80211_IFTYPE_AP
:
1764 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1766 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1767 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1768 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1771 case NL80211_IFTYPE_WDS
:
1772 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1774 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1775 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1776 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1777 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1780 #ifdef CONFIG_MAC80211_MESH
1781 case NL80211_IFTYPE_MESH_POINT
:
1782 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1783 /* Do not send frames with mesh_ttl == 0 */
1784 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1789 if (!is_multicast_ether_addr(skb
->data
))
1790 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1793 * Use address extension if it is a packet from
1794 * another interface or if we know the destination
1795 * is being proxied by a portal (i.e. portal address
1796 * differs from proxied address)
1798 if (compare_ether_addr(sdata
->vif
.addr
,
1799 skb
->data
+ ETH_ALEN
) == 0 &&
1800 !(mppath
&& compare_ether_addr(mppath
->mpp
, skb
->data
))) {
1801 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1802 skb
->data
, skb
->data
+ ETH_ALEN
);
1804 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1807 int is_mesh_mcast
= 1;
1810 if (is_multicast_ether_addr(skb
->data
))
1811 /* DA TA mSA AE:SA */
1812 mesh_da
= skb
->data
;
1814 static const u8 bcast
[ETH_ALEN
] =
1815 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1817 /* RA TA mDA mSA AE:DA SA */
1818 mesh_da
= mppath
->mpp
;
1821 /* DA TA mSA AE:SA */
1825 hdrlen
= ieee80211_fill_mesh_addresses(&hdr
, &fc
,
1826 mesh_da
, sdata
->vif
.addr
);
1830 ieee80211_new_mesh_header(&mesh_hdr
,
1832 skb
->data
+ ETH_ALEN
,
1836 ieee80211_new_mesh_header(&mesh_hdr
,
1839 skb
->data
+ ETH_ALEN
);
1844 case NL80211_IFTYPE_STATION
:
1845 if (sdata
->wdev
.wiphy
->flags
& WIPHY_FLAG_SUPPORTS_TDLS
) {
1846 bool tdls_peer
= false;
1849 sta
= sta_info_get(sdata
, skb
->data
);
1851 authorized
= test_sta_flag(sta
,
1852 WLAN_STA_AUTHORIZED
);
1853 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1854 tdls_peer
= test_sta_flag(sta
,
1855 WLAN_STA_TDLS_PEER
);
1856 tdls_auth
= test_sta_flag(sta
,
1857 WLAN_STA_TDLS_PEER_AUTH
);
1862 * If the TDLS link is enabled, send everything
1863 * directly. Otherwise, allow TDLS setup frames
1864 * to be transmitted indirectly.
1866 tdls_direct
= tdls_peer
&& (tdls_auth
||
1867 !(ethertype
== ETH_P_TDLS
&& skb
->len
> 14 &&
1868 skb
->data
[14] == WLAN_TDLS_SNAP_RFTYPE
));
1872 /* link during setup - throw out frames to peer */
1879 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1880 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1881 memcpy(hdr
.addr3
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1883 } else if (sdata
->u
.mgd
.use_4addr
&&
1884 cpu_to_be16(ethertype
) != sdata
->control_port_protocol
) {
1885 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
|
1886 IEEE80211_FCTL_TODS
);
1888 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1889 memcpy(hdr
.addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1890 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1891 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1894 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1896 memcpy(hdr
.addr1
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1897 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1898 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1902 case NL80211_IFTYPE_ADHOC
:
1904 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1905 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1906 memcpy(hdr
.addr3
, sdata
->u
.ibss
.bssid
, ETH_ALEN
);
1915 * There's no need to try to look up the destination
1916 * if it is a multicast address (which can only happen
1919 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1921 sta
= sta_info_get(sdata
, hdr
.addr1
);
1923 authorized
= test_sta_flag(sta
, WLAN_STA_AUTHORIZED
);
1924 wme_sta
= test_sta_flag(sta
, WLAN_STA_WME
);
1929 /* For mesh, the use of the QoS header is mandatory */
1930 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1933 /* receiver and we are QoS enabled, use a QoS type frame */
1934 if (wme_sta
&& local
->hw
.queues
>= 4) {
1935 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1940 * Drop unicast frames to unauthorised stations unless they are
1941 * EAPOL frames from the local station.
1943 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1944 unlikely(!is_multicast_ether_addr(hdr
.addr1
) && !authorized
&&
1945 !(cpu_to_be16(ethertype
) == sdata
->control_port_protocol
&&
1946 compare_ether_addr(sdata
->vif
.addr
,
1947 skb
->data
+ ETH_ALEN
) == 0))) {
1948 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1949 if (net_ratelimit())
1950 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1951 " (unauthorized port)\n", dev
->name
,
1955 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1962 * If the skb is shared we need to obtain our own copy.
1964 if (skb_shared(skb
)) {
1966 skb
= skb_clone(skb
, GFP_ATOMIC
);
1975 hdr
.frame_control
= fc
;
1976 hdr
.duration_id
= 0;
1979 skip_header_bytes
= ETH_HLEN
;
1980 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1981 encaps_data
= bridge_tunnel_header
;
1982 encaps_len
= sizeof(bridge_tunnel_header
);
1983 skip_header_bytes
-= 2;
1984 } else if (ethertype
>= 0x600) {
1985 encaps_data
= rfc1042_header
;
1986 encaps_len
= sizeof(rfc1042_header
);
1987 skip_header_bytes
-= 2;
1993 nh_pos
= skb_network_header(skb
) - skb
->data
;
1994 h_pos
= skb_transport_header(skb
) - skb
->data
;
1996 skb_pull(skb
, skip_header_bytes
);
1997 nh_pos
-= skip_header_bytes
;
1998 h_pos
-= skip_header_bytes
;
2000 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
2003 * So we need to modify the skb header and hence need a copy of
2004 * that. The head_need variable above doesn't, so far, include
2005 * the needed header space that we don't need right away. If we
2006 * can, then we don't reallocate right now but only after the
2007 * frame arrives at the master device (if it does...)
2009 * If we cannot, however, then we will reallocate to include all
2010 * the ever needed space. Also, if we need to reallocate it anyway,
2011 * make it big enough for everything we may ever need.
2014 if (head_need
> 0 || skb_cloned(skb
)) {
2015 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
2016 head_need
+= local
->tx_headroom
;
2017 head_need
= max_t(int, 0, head_need
);
2018 if (ieee80211_skb_resize(sdata
, skb
, head_need
, true))
2023 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
2024 nh_pos
+= encaps_len
;
2025 h_pos
+= encaps_len
;
2028 #ifdef CONFIG_MAC80211_MESH
2029 if (meshhdrlen
> 0) {
2030 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
2031 nh_pos
+= meshhdrlen
;
2032 h_pos
+= meshhdrlen
;
2036 if (ieee80211_is_data_qos(fc
)) {
2037 __le16
*qos_control
;
2039 qos_control
= (__le16
*) skb_push(skb
, 2);
2040 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
2042 * Maybe we could actually set some fields here, for now just
2043 * initialise to zero to indicate no special operation.
2047 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
2052 dev
->stats
.tx_packets
++;
2053 dev
->stats
.tx_bytes
+= skb
->len
;
2055 /* Update skb pointers to various headers since this modified frame
2056 * is going to go through Linux networking code that may potentially
2057 * need things like pointer to IP header. */
2058 skb_set_mac_header(skb
, 0);
2059 skb_set_network_header(skb
, nh_pos
);
2060 skb_set_transport_header(skb
, h_pos
);
2062 info
= IEEE80211_SKB_CB(skb
);
2063 memset(info
, 0, sizeof(*info
));
2065 dev
->trans_start
= jiffies
;
2066 ieee80211_xmit(sdata
, skb
);
2068 return NETDEV_TX_OK
;
2071 if (ret
== NETDEV_TX_OK
)
2079 * ieee80211_clear_tx_pending may not be called in a context where
2080 * it is possible that it packets could come in again.
2082 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
2086 for (i
= 0; i
< local
->hw
.queues
; i
++)
2087 skb_queue_purge(&local
->pending
[i
]);
2091 * Returns false if the frame couldn't be transmitted but was queued instead,
2092 * which in this case means re-queued -- take as an indication to stop sending
2093 * more pending frames.
2095 static bool ieee80211_tx_pending_skb(struct ieee80211_local
*local
,
2096 struct sk_buff
*skb
)
2098 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2099 struct ieee80211_sub_if_data
*sdata
;
2100 struct sta_info
*sta
;
2101 struct ieee80211_hdr
*hdr
;
2104 sdata
= vif_to_sdata(info
->control
.vif
);
2106 if (info
->flags
& IEEE80211_TX_INTFL_NEED_TXPROCESSING
) {
2107 result
= ieee80211_tx(sdata
, skb
, true);
2109 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2110 sta
= sta_info_get(sdata
, hdr
->addr1
);
2112 result
= __ieee80211_tx(local
, &skb
, sta
, true);
2119 * Transmit all pending packets. Called from tasklet.
2121 void ieee80211_tx_pending(unsigned long data
)
2123 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
2124 struct ieee80211_sub_if_data
*sdata
;
2125 unsigned long flags
;
2131 spin_lock_irqsave(&local
->queue_stop_reason_lock
, flags
);
2132 for (i
= 0; i
< local
->hw
.queues
; i
++) {
2134 * If queue is stopped by something other than due to pending
2135 * frames, or we have no pending frames, proceed to next queue.
2137 if (local
->queue_stop_reasons
[i
] ||
2138 skb_queue_empty(&local
->pending
[i
]))
2141 while (!skb_queue_empty(&local
->pending
[i
])) {
2142 struct sk_buff
*skb
= __skb_dequeue(&local
->pending
[i
]);
2143 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2145 if (WARN_ON(!info
->control
.vif
)) {
2150 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
,
2153 txok
= ieee80211_tx_pending_skb(local
, skb
);
2154 spin_lock_irqsave(&local
->queue_stop_reason_lock
,
2160 if (skb_queue_empty(&local
->pending
[i
]))
2161 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
)
2162 netif_wake_subqueue(sdata
->dev
, i
);
2164 spin_unlock_irqrestore(&local
->queue_stop_reason_lock
, flags
);
2169 /* functions for drivers to get certain frames */
2171 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
2172 struct sk_buff
*skb
,
2173 struct beacon_data
*beacon
)
2177 int i
, have_bits
= 0, n1
, n2
;
2179 /* Generate bitmap for TIM only if there are any STAs in power save
2181 if (atomic_read(&bss
->num_sta_ps
) > 0)
2182 /* in the hope that this is faster than
2183 * checking byte-for-byte */
2184 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
2185 IEEE80211_MAX_AID
+1);
2187 if (bss
->dtim_count
== 0)
2188 bss
->dtim_count
= beacon
->dtim_period
- 1;
2192 tim
= pos
= (u8
*) skb_put(skb
, 6);
2193 *pos
++ = WLAN_EID_TIM
;
2195 *pos
++ = bss
->dtim_count
;
2196 *pos
++ = beacon
->dtim_period
;
2198 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
2201 bss
->dtim_bc_mc
= aid0
== 1;
2204 /* Find largest even number N1 so that bits numbered 1 through
2205 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2206 * (N2 + 1) x 8 through 2007 are 0. */
2208 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
2215 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
2222 /* Bitmap control */
2224 /* Part Virt Bitmap */
2225 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
2227 tim
[1] = n2
- n1
+ 4;
2228 skb_put(skb
, n2
- n1
);
2230 *pos
++ = aid0
; /* Bitmap control */
2231 *pos
++ = 0; /* Part Virt Bitmap */
2235 struct sk_buff
*ieee80211_beacon_get_tim(struct ieee80211_hw
*hw
,
2236 struct ieee80211_vif
*vif
,
2237 u16
*tim_offset
, u16
*tim_length
)
2239 struct ieee80211_local
*local
= hw_to_local(hw
);
2240 struct sk_buff
*skb
= NULL
;
2241 struct ieee80211_tx_info
*info
;
2242 struct ieee80211_sub_if_data
*sdata
= NULL
;
2243 struct ieee80211_if_ap
*ap
= NULL
;
2244 struct beacon_data
*beacon
;
2245 struct ieee80211_supported_band
*sband
;
2246 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
2247 struct ieee80211_tx_rate_control txrc
;
2249 sband
= local
->hw
.wiphy
->bands
[band
];
2253 sdata
= vif_to_sdata(vif
);
2255 if (!ieee80211_sdata_running(sdata
))
2263 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2265 beacon
= rcu_dereference(ap
->beacon
);
2268 * headroom, head length,
2269 * tail length and maximum TIM length
2271 skb
= dev_alloc_skb(local
->tx_headroom
+
2273 beacon
->tail_len
+ 256);
2277 skb_reserve(skb
, local
->tx_headroom
);
2278 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
2282 * Not very nice, but we want to allow the driver to call
2283 * ieee80211_beacon_get() as a response to the set_tim()
2284 * callback. That, however, is already invoked under the
2285 * sta_lock to guarantee consistent and race-free update
2286 * of the tim bitmap in mac80211 and the driver.
2288 if (local
->tim_in_locked_section
) {
2289 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2291 unsigned long flags
;
2293 spin_lock_irqsave(&local
->sta_lock
, flags
);
2294 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
2295 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
2299 *tim_offset
= beacon
->head_len
;
2301 *tim_length
= skb
->len
- beacon
->head_len
;
2304 memcpy(skb_put(skb
, beacon
->tail_len
),
2305 beacon
->tail
, beacon
->tail_len
);
2308 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
2309 struct ieee80211_if_ibss
*ifibss
= &sdata
->u
.ibss
;
2310 struct ieee80211_hdr
*hdr
;
2311 struct sk_buff
*presp
= rcu_dereference(ifibss
->presp
);
2316 skb
= skb_copy(presp
, GFP_ATOMIC
);
2320 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2321 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2322 IEEE80211_STYPE_BEACON
);
2323 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
2324 struct ieee80211_mgmt
*mgmt
;
2327 #ifdef CONFIG_MAC80211_MESH
2328 if (!sdata
->u
.mesh
.mesh_id_len
)
2332 /* headroom, head length, tail length and maximum TIM length */
2333 skb
= dev_alloc_skb(local
->tx_headroom
+ 400 +
2334 sdata
->u
.mesh
.ie_len
);
2338 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2339 mgmt
= (struct ieee80211_mgmt
*)
2340 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
2341 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
2342 mgmt
->frame_control
=
2343 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
2344 memset(mgmt
->da
, 0xff, ETH_ALEN
);
2345 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2346 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
2347 mgmt
->u
.beacon
.beacon_int
=
2348 cpu_to_le16(sdata
->vif
.bss_conf
.beacon_int
);
2349 mgmt
->u
.beacon
.capab_info
|= cpu_to_le16(
2350 sdata
->u
.mesh
.security
? WLAN_CAPABILITY_PRIVACY
: 0);
2352 pos
= skb_put(skb
, 2);
2353 *pos
++ = WLAN_EID_SSID
;
2356 if (ieee80211_add_srates_ie(&sdata
->vif
, skb
) ||
2357 mesh_add_ds_params_ie(skb
, sdata
) ||
2358 ieee80211_add_ext_srates_ie(&sdata
->vif
, skb
) ||
2359 mesh_add_rsn_ie(skb
, sdata
) ||
2360 mesh_add_meshid_ie(skb
, sdata
) ||
2361 mesh_add_meshconf_ie(skb
, sdata
) ||
2362 mesh_add_vendor_ies(skb
, sdata
)) {
2363 pr_err("o11s: couldn't add ies!\n");
2371 info
= IEEE80211_SKB_CB(skb
);
2373 info
->flags
|= IEEE80211_TX_INTFL_DONT_ENCRYPT
;
2374 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
2377 memset(&txrc
, 0, sizeof(txrc
));
2380 txrc
.bss_conf
= &sdata
->vif
.bss_conf
;
2382 txrc
.reported_rate
.idx
= -1;
2383 txrc
.rate_idx_mask
= sdata
->rc_rateidx_mask
[band
];
2384 if (txrc
.rate_idx_mask
== (1 << sband
->n_bitrates
) - 1)
2385 txrc
.max_rate_idx
= -1;
2387 txrc
.max_rate_idx
= fls(txrc
.rate_idx_mask
) - 1;
2389 rate_control_get_rate(sdata
, NULL
, &txrc
);
2391 info
->control
.vif
= vif
;
2393 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
|
2394 IEEE80211_TX_CTL_ASSIGN_SEQ
|
2395 IEEE80211_TX_CTL_FIRST_FRAGMENT
;
2400 EXPORT_SYMBOL(ieee80211_beacon_get_tim
);
2402 struct sk_buff
*ieee80211_pspoll_get(struct ieee80211_hw
*hw
,
2403 struct ieee80211_vif
*vif
)
2405 struct ieee80211_sub_if_data
*sdata
;
2406 struct ieee80211_if_managed
*ifmgd
;
2407 struct ieee80211_pspoll
*pspoll
;
2408 struct ieee80211_local
*local
;
2409 struct sk_buff
*skb
;
2411 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2414 sdata
= vif_to_sdata(vif
);
2415 ifmgd
= &sdata
->u
.mgd
;
2416 local
= sdata
->local
;
2418 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*pspoll
));
2422 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2424 pspoll
= (struct ieee80211_pspoll
*) skb_put(skb
, sizeof(*pspoll
));
2425 memset(pspoll
, 0, sizeof(*pspoll
));
2426 pspoll
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_CTL
|
2427 IEEE80211_STYPE_PSPOLL
);
2428 pspoll
->aid
= cpu_to_le16(ifmgd
->aid
);
2430 /* aid in PS-Poll has its two MSBs each set to 1 */
2431 pspoll
->aid
|= cpu_to_le16(1 << 15 | 1 << 14);
2433 memcpy(pspoll
->bssid
, ifmgd
->bssid
, ETH_ALEN
);
2434 memcpy(pspoll
->ta
, vif
->addr
, ETH_ALEN
);
2438 EXPORT_SYMBOL(ieee80211_pspoll_get
);
2440 struct sk_buff
*ieee80211_nullfunc_get(struct ieee80211_hw
*hw
,
2441 struct ieee80211_vif
*vif
)
2443 struct ieee80211_hdr_3addr
*nullfunc
;
2444 struct ieee80211_sub_if_data
*sdata
;
2445 struct ieee80211_if_managed
*ifmgd
;
2446 struct ieee80211_local
*local
;
2447 struct sk_buff
*skb
;
2449 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
2452 sdata
= vif_to_sdata(vif
);
2453 ifmgd
= &sdata
->u
.mgd
;
2454 local
= sdata
->local
;
2456 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*nullfunc
));
2460 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2462 nullfunc
= (struct ieee80211_hdr_3addr
*) skb_put(skb
,
2464 memset(nullfunc
, 0, sizeof(*nullfunc
));
2465 nullfunc
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
2466 IEEE80211_STYPE_NULLFUNC
|
2467 IEEE80211_FCTL_TODS
);
2468 memcpy(nullfunc
->addr1
, ifmgd
->bssid
, ETH_ALEN
);
2469 memcpy(nullfunc
->addr2
, vif
->addr
, ETH_ALEN
);
2470 memcpy(nullfunc
->addr3
, ifmgd
->bssid
, ETH_ALEN
);
2474 EXPORT_SYMBOL(ieee80211_nullfunc_get
);
2476 struct sk_buff
*ieee80211_probereq_get(struct ieee80211_hw
*hw
,
2477 struct ieee80211_vif
*vif
,
2478 const u8
*ssid
, size_t ssid_len
,
2479 const u8
*ie
, size_t ie_len
)
2481 struct ieee80211_sub_if_data
*sdata
;
2482 struct ieee80211_local
*local
;
2483 struct ieee80211_hdr_3addr
*hdr
;
2484 struct sk_buff
*skb
;
2488 sdata
= vif_to_sdata(vif
);
2489 local
= sdata
->local
;
2490 ie_ssid_len
= 2 + ssid_len
;
2492 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ sizeof(*hdr
) +
2493 ie_ssid_len
+ ie_len
);
2497 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2499 hdr
= (struct ieee80211_hdr_3addr
*) skb_put(skb
, sizeof(*hdr
));
2500 memset(hdr
, 0, sizeof(*hdr
));
2501 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2502 IEEE80211_STYPE_PROBE_REQ
);
2503 memset(hdr
->addr1
, 0xff, ETH_ALEN
);
2504 memcpy(hdr
->addr2
, vif
->addr
, ETH_ALEN
);
2505 memset(hdr
->addr3
, 0xff, ETH_ALEN
);
2507 pos
= skb_put(skb
, ie_ssid_len
);
2508 *pos
++ = WLAN_EID_SSID
;
2511 memcpy(pos
, ssid
, ssid_len
);
2515 pos
= skb_put(skb
, ie_len
);
2516 memcpy(pos
, ie
, ie_len
);
2521 EXPORT_SYMBOL(ieee80211_probereq_get
);
2523 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2524 const void *frame
, size_t frame_len
,
2525 const struct ieee80211_tx_info
*frame_txctl
,
2526 struct ieee80211_rts
*rts
)
2528 const struct ieee80211_hdr
*hdr
= frame
;
2530 rts
->frame_control
=
2531 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2532 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2534 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2535 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2537 EXPORT_SYMBOL(ieee80211_rts_get
);
2539 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2540 const void *frame
, size_t frame_len
,
2541 const struct ieee80211_tx_info
*frame_txctl
,
2542 struct ieee80211_cts
*cts
)
2544 const struct ieee80211_hdr
*hdr
= frame
;
2546 cts
->frame_control
=
2547 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2548 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2549 frame_len
, frame_txctl
);
2550 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2552 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2555 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2556 struct ieee80211_vif
*vif
)
2558 struct ieee80211_local
*local
= hw_to_local(hw
);
2559 struct sk_buff
*skb
= NULL
;
2560 struct ieee80211_tx_data tx
;
2561 struct ieee80211_sub_if_data
*sdata
;
2562 struct ieee80211_if_ap
*bss
= NULL
;
2563 struct beacon_data
*beacon
;
2564 struct ieee80211_tx_info
*info
;
2566 sdata
= vif_to_sdata(vif
);
2570 beacon
= rcu_dereference(bss
->beacon
);
2572 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2575 if (bss
->dtim_count
!= 0 || !bss
->dtim_bc_mc
)
2576 goto out
; /* send buffered bc/mc only after DTIM beacon */
2579 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2582 local
->total_ps_buffered
--;
2584 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2585 struct ieee80211_hdr
*hdr
=
2586 (struct ieee80211_hdr
*) skb
->data
;
2587 /* more buffered multicast/broadcast frames ==> set
2588 * MoreData flag in IEEE 802.11 header to inform PS
2590 hdr
->frame_control
|=
2591 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2594 if (!ieee80211_tx_prepare(sdata
, &tx
, skb
))
2596 dev_kfree_skb_any(skb
);
2599 info
= IEEE80211_SKB_CB(skb
);
2601 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2602 tx
.channel
= local
->hw
.conf
.channel
;
2603 info
->band
= tx
.channel
->band
;
2605 if (invoke_tx_handlers(&tx
))
2612 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);
2614 void ieee80211_tx_skb(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
2616 skb_set_mac_header(skb
, 0);
2617 skb_set_network_header(skb
, 0);
2618 skb_set_transport_header(skb
, 0);
2620 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2621 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
2625 * The other path calling ieee80211_xmit is from the tasklet,
2626 * and while we can handle concurrent transmissions locking
2627 * requirements are that we do not come into tx with bhs on.
2630 ieee80211_xmit(sdata
, skb
);