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"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static __le16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
44 int rate
, mrate
, erp
, dur
, i
;
45 struct ieee80211_rate
*txrate
;
46 struct ieee80211_local
*local
= tx
->local
;
47 struct ieee80211_supported_band
*sband
;
48 struct ieee80211_hdr
*hdr
;
49 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
51 /* assume HW handles this */
52 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)
56 if (WARN_ON_ONCE(info
->control
.rates
[0].idx
< 0))
59 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
60 txrate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
62 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
65 * data and mgmt (except PS Poll):
67 * - during contention period:
68 * if addr1 is group address: 0
69 * if more fragments = 0 and addr1 is individual address: time to
70 * transmit one ACK plus SIFS
71 * if more fragments = 1 and addr1 is individual address: time to
72 * transmit next fragment plus 2 x ACK plus 3 x SIFS
75 * - control response frame (CTS or ACK) shall be transmitted using the
76 * same rate as the immediately previous frame in the frame exchange
77 * sequence, if this rate belongs to the PHY mandatory rates, or else
78 * at the highest possible rate belonging to the PHY rates in the
81 hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
82 if (ieee80211_is_ctl(hdr
->frame_control
)) {
83 /* TODO: These control frames are not currently sent by
84 * mac80211, but should they be implemented, this function
85 * needs to be updated to support duration field calculation.
87 * RTS: time needed to transmit pending data/mgmt frame plus
88 * one CTS frame plus one ACK frame plus 3 x SIFS
89 * CTS: duration of immediately previous RTS minus time
90 * required to transmit CTS and its SIFS
91 * ACK: 0 if immediately previous directed data/mgmt had
92 * more=0, with more=1 duration in ACK frame is duration
93 * from previous frame minus time needed to transmit ACK
95 * PS Poll: BIT(15) | BIT(14) | aid
101 if (0 /* FIX: data/mgmt during CFP */)
102 return cpu_to_le16(32768);
104 if (group_addr
) /* Group address as the destination - no ACK */
107 /* Individual destination address:
108 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
109 * CTS and ACK frames shall be transmitted using the highest rate in
110 * basic rate set that is less than or equal to the rate of the
111 * immediately previous frame and that is using the same modulation
112 * (CCK or OFDM). If no basic rate set matches with these requirements,
113 * the highest mandatory rate of the PHY that is less than or equal to
114 * the rate of the previous frame is used.
115 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
118 /* use lowest available if everything fails */
119 mrate
= sband
->bitrates
[0].bitrate
;
120 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
121 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
123 if (r
->bitrate
> txrate
->bitrate
)
126 if (tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
))
129 switch (sband
->band
) {
130 case IEEE80211_BAND_2GHZ
: {
132 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
133 flag
= IEEE80211_RATE_MANDATORY_G
;
135 flag
= IEEE80211_RATE_MANDATORY_B
;
140 case IEEE80211_BAND_5GHZ
:
141 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
144 case IEEE80211_NUM_BANDS
:
150 /* No matching basic rate found; use highest suitable mandatory
155 /* Time needed to transmit ACK
156 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
157 * to closest integer */
159 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
160 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
163 /* Frame is fragmented: duration increases with time needed to
164 * transmit next fragment plus ACK and 2 x SIFS. */
165 dur
*= 2; /* ACK + SIFS */
167 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
168 txrate
->bitrate
, erp
,
169 tx
->sdata
->vif
.bss_conf
.use_short_preamble
);
172 return cpu_to_le16(dur
);
175 static int inline is_ieee80211_device(struct ieee80211_local
*local
,
176 struct net_device
*dev
)
178 return local
== wdev_priv(dev
->ieee80211_ptr
);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
187 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
188 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
191 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
194 if (unlikely(tx
->local
->sw_scanning
) &&
195 !ieee80211_is_probe_req(hdr
->frame_control
))
198 if (tx
->sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
201 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
204 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
206 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
207 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
208 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
209 ieee80211_is_data(hdr
->frame_control
))) {
210 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
211 printk(KERN_DEBUG
"%s: dropped data frame to not "
212 "associated station %pM\n",
213 tx
->dev
->name
, hdr
->addr1
);
214 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
215 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
219 if (unlikely(ieee80211_is_data(hdr
->frame_control
) &&
220 tx
->local
->num_sta
== 0 &&
221 tx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)) {
223 * No associated STAs - no need to send multicast
234 /* This function is called whenever the AP is about to exceed the maximum limit
235 * of buffered frames for power saving STAs. This situation should not really
236 * happen often during normal operation, so dropping the oldest buffered packet
237 * from each queue should be OK to make some room for new frames. */
238 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
240 int total
= 0, purged
= 0;
242 struct ieee80211_sub_if_data
*sdata
;
243 struct sta_info
*sta
;
246 * virtual interfaces are protected by RCU
250 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
251 struct ieee80211_if_ap
*ap
;
252 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
255 skb
= skb_dequeue(&ap
->ps_bc_buf
);
260 total
+= skb_queue_len(&ap
->ps_bc_buf
);
263 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
264 skb
= skb_dequeue(&sta
->ps_tx_buf
);
269 total
+= skb_queue_len(&sta
->ps_tx_buf
);
274 local
->total_ps_buffered
= total
;
275 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
276 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
277 wiphy_name(local
->hw
.wiphy
), purged
);
281 static ieee80211_tx_result
282 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
284 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
285 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
288 * broadcast/multicast frame
290 * If any of the associated stations is in power save mode,
291 * the frame is buffered to be sent after DTIM beacon frame.
292 * This is done either by the hardware or us.
295 /* powersaving STAs only in AP/VLAN mode */
299 /* no buffering for ordered frames */
300 if (ieee80211_has_order(hdr
->frame_control
))
303 /* no stations in PS mode */
304 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
307 /* buffered in mac80211 */
308 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
309 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
310 purge_old_ps_buffers(tx
->local
);
311 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
313 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
314 if (net_ratelimit()) {
315 printk(KERN_DEBUG
"%s: BC TX buffer full - "
316 "dropping the oldest frame\n",
320 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
322 tx
->local
->total_ps_buffered
++;
323 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
327 /* buffered in hardware */
328 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
333 static ieee80211_tx_result
334 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
336 struct sta_info
*sta
= tx
->sta
;
337 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
338 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
341 if (unlikely(!sta
|| ieee80211_is_probe_resp(hdr
->frame_control
)))
344 staflags
= get_sta_flags(sta
);
346 if (unlikely((staflags
& WLAN_STA_PS
) &&
347 !(staflags
& WLAN_STA_PSPOLL
))) {
348 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
349 printk(KERN_DEBUG
"STA %pM aid %d: PS buffer (entries "
351 sta
->sta
.addr
, sta
->sta
.aid
,
352 skb_queue_len(&sta
->ps_tx_buf
));
353 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
354 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
355 purge_old_ps_buffers(tx
->local
);
356 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
357 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
358 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
359 if (net_ratelimit()) {
360 printk(KERN_DEBUG
"%s: STA %pM TX "
361 "buffer full - dropping oldest frame\n",
362 tx
->dev
->name
, sta
->sta
.addr
);
367 tx
->local
->total_ps_buffered
++;
369 /* Queue frame to be sent after STA sends an PS Poll frame */
370 if (skb_queue_empty(&sta
->ps_tx_buf
))
371 sta_info_set_tim_bit(sta
);
373 info
->control
.jiffies
= jiffies
;
374 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
377 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
378 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
379 printk(KERN_DEBUG
"%s: STA %pM in PS mode, but pspoll "
380 "set -> send frame\n", tx
->dev
->name
,
383 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
384 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
389 static ieee80211_tx_result debug_noinline
390 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
392 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
395 if (tx
->flags
& IEEE80211_TX_UNICAST
)
396 return ieee80211_tx_h_unicast_ps_buf(tx
);
398 return ieee80211_tx_h_multicast_ps_buf(tx
);
401 static ieee80211_tx_result debug_noinline
402 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
404 struct ieee80211_key
*key
;
405 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
406 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
408 if (unlikely(tx
->skb
->do_not_encrypt
))
410 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
412 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
414 else if (tx
->sdata
->drop_unencrypted
&&
415 (tx
->skb
->protocol
!= cpu_to_be16(ETH_P_PAE
)) &&
416 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
417 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
423 tx
->key
->tx_rx_count
++;
424 /* TODO: add threshold stuff again */
426 switch (tx
->key
->conf
.alg
) {
428 if (ieee80211_is_auth(hdr
->frame_control
))
432 if (!ieee80211_is_data_present(hdr
->frame_control
))
438 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
439 tx
->skb
->do_not_encrypt
= 1;
444 static ieee80211_tx_result debug_noinline
445 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
447 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
448 struct ieee80211_hdr
*hdr
= (void *)tx
->skb
->data
;
449 struct ieee80211_supported_band
*sband
;
450 struct ieee80211_rate
*rate
;
452 bool inval
= false, rts
= false, short_preamble
= false;
453 struct ieee80211_tx_rate_control txrc
;
455 memset(&txrc
, 0, sizeof(txrc
));
457 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
459 len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
460 tx
->local
->fragmentation_threshold
);
462 /* set up the tx rate control struct we give the RC algo */
463 txrc
.hw
= local_to_hw(tx
->local
);
465 txrc
.bss_conf
= &tx
->sdata
->vif
.bss_conf
;
467 txrc
.reported_rate
.idx
= -1;
468 txrc
.max_rate_idx
= tx
->sdata
->max_ratectrl_rateidx
;
470 /* set up RTS protection if desired */
471 if (tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
&&
472 len
> tx
->local
->rts_threshold
) {
473 txrc
.rts
= rts
= true;
477 * Use short preamble if the BSS can handle it, but not for
478 * management frames unless we know the receiver can handle
479 * that -- the management frame might be to a station that
480 * just wants a probe response.
482 if (tx
->sdata
->vif
.bss_conf
.use_short_preamble
&&
483 (ieee80211_is_data(hdr
->frame_control
) ||
484 (tx
->sta
&& test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))))
485 txrc
.short_preamble
= short_preamble
= true;
488 rate_control_get_rate(tx
->sdata
, tx
->sta
, &txrc
);
490 if (unlikely(info
->control
.rates
[0].idx
< 0))
493 if (txrc
.reported_rate
.idx
< 0)
494 txrc
.reported_rate
= info
->control
.rates
[0];
497 tx
->sta
->last_tx_rate
= txrc
.reported_rate
;
499 if (unlikely(!info
->control
.rates
[0].count
))
500 info
->control
.rates
[0].count
= 1;
502 if (is_multicast_ether_addr(hdr
->addr1
)) {
504 * XXX: verify the rate is in the basic rateset
510 * set up the RTS/CTS rate as the fastest basic rate
511 * that is not faster than the data rate
513 * XXX: Should this check all retry rates?
515 if (!(info
->control
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) {
518 rate
= &sband
->bitrates
[info
->control
.rates
[0].idx
];
520 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
521 /* must be a basic rate */
522 if (!(tx
->sdata
->vif
.bss_conf
.basic_rates
& BIT(i
)))
524 /* must not be faster than the data rate */
525 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
528 if (sband
->bitrates
[baserate
].bitrate
<
529 sband
->bitrates
[i
].bitrate
)
533 info
->control
.rts_cts_rate_idx
= baserate
;
536 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
538 * make sure there's no valid rate following
539 * an invalid one, just in case drivers don't
540 * take the API seriously to stop at -1.
543 info
->control
.rates
[i
].idx
= -1;
546 if (info
->control
.rates
[i
].idx
< 0) {
552 * For now assume MCS is already set up correctly, this
555 if (info
->control
.rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
556 WARN_ON(info
->control
.rates
[i
].idx
> 76);
560 /* set up RTS protection if desired */
562 info
->control
.rates
[i
].flags
|=
563 IEEE80211_TX_RC_USE_RTS_CTS
;
566 if (WARN_ON_ONCE(info
->control
.rates
[i
].idx
>=
567 sband
->n_bitrates
)) {
568 info
->control
.rates
[i
].idx
= -1;
572 rate
= &sband
->bitrates
[info
->control
.rates
[i
].idx
];
574 /* set up short preamble */
575 if (short_preamble
&&
576 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
577 info
->control
.rates
[i
].flags
|=
578 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
580 /* set up G protection */
581 if (!rts
&& tx
->sdata
->vif
.bss_conf
.use_cts_prot
&&
582 rate
->flags
& IEEE80211_RATE_ERP_G
)
583 info
->control
.rates
[i
].flags
|=
584 IEEE80211_TX_RC_USE_CTS_PROTECT
;
590 static ieee80211_tx_result debug_noinline
591 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
593 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
596 info
->control
.sta
= &tx
->sta
->sta
;
601 static ieee80211_tx_result debug_noinline
602 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
604 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
605 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
611 * Packet injection may want to control the sequence
612 * number, if we have no matching interface then we
613 * neither assign one ourselves nor ask the driver to.
615 if (unlikely(!info
->control
.vif
))
618 if (unlikely(ieee80211_is_ctl(hdr
->frame_control
)))
621 if (ieee80211_hdrlen(hdr
->frame_control
) < 24)
625 * Anything but QoS data that has a sequence number field
626 * (is long enough) gets a sequence number from the global
629 if (!ieee80211_is_data_qos(hdr
->frame_control
)) {
630 /* driver should assign sequence number */
631 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
632 /* for pure STA mode without beacons, we can do it */
633 hdr
->seq_ctrl
= cpu_to_le16(tx
->sdata
->sequence_number
);
634 tx
->sdata
->sequence_number
+= 0x10;
635 tx
->sdata
->sequence_number
&= IEEE80211_SCTL_SEQ
;
640 * This should be true for injected/management frames only, for
641 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
642 * above since they are not QoS-data frames.
647 /* include per-STA, per-TID sequence counter */
649 qc
= ieee80211_get_qos_ctl(hdr
);
650 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
651 seq
= &tx
->sta
->tid_seq
[tid
];
653 hdr
->seq_ctrl
= cpu_to_le16(*seq
);
655 /* Increase the sequence number. */
656 *seq
= (*seq
+ 0x10) & IEEE80211_SCTL_SEQ
;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
664 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
665 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
666 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
667 struct sk_buff
**frags
, *first
, *frag
;
671 int frag_threshold
= tx
->local
->fragmentation_threshold
;
673 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
677 * Warn when submitting a fragmented A-MPDU frame and drop it.
678 * This scenario is handled in __ieee80211_tx_prepare but extra
679 * caution taken here as fragmented ampdu may cause Tx stop.
681 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
686 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
687 payload_len
= first
->len
- hdrlen
;
688 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
689 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
691 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
695 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
696 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
697 pos
= first
->data
+ hdrlen
+ per_fragm
;
698 left
= payload_len
- per_fragm
;
699 for (i
= 0; i
< num_fragm
- 1; i
++) {
700 struct ieee80211_hdr
*fhdr
;
706 /* reserve enough extra head and tail room for possible
709 dev_alloc_skb(tx
->local
->tx_headroom
+
711 IEEE80211_ENCRYPT_HEADROOM
+
712 IEEE80211_ENCRYPT_TAILROOM
);
716 /* Make sure that all fragments use the same priority so
717 * that they end up using the same TX queue */
718 frag
->priority
= first
->priority
;
720 skb_reserve(frag
, tx
->local
->tx_headroom
+
721 IEEE80211_ENCRYPT_HEADROOM
);
723 /* copy TX information */
724 info
= IEEE80211_SKB_CB(frag
);
725 memcpy(info
, first
->cb
, sizeof(frag
->cb
));
727 /* copy/fill in 802.11 header */
728 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
729 memcpy(fhdr
, first
->data
, hdrlen
);
730 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
732 if (i
== num_fragm
- 2) {
733 /* clear MOREFRAGS bit for the last fragment */
734 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
737 * No multi-rate retries for fragmented frames, that
738 * would completely throw off the NAV at other STAs.
740 info
->control
.rates
[1].idx
= -1;
741 info
->control
.rates
[2].idx
= -1;
742 info
->control
.rates
[3].idx
= -1;
743 info
->control
.rates
[4].idx
= -1;
744 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
745 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
749 copylen
= left
> per_fragm
? per_fragm
: left
;
750 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
752 skb_copy_queue_mapping(frag
, first
);
754 frag
->do_not_encrypt
= first
->do_not_encrypt
;
755 frag
->dev
= first
->dev
;
756 frag
->iif
= first
->iif
;
761 skb_trim(first
, hdrlen
+ per_fragm
);
763 tx
->num_extra_frag
= num_fragm
- 1;
764 tx
->extra_frag
= frags
;
770 for (i
= 0; i
< num_fragm
- 1; i
++)
772 dev_kfree_skb(frags
[i
]);
775 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
779 static ieee80211_tx_result debug_noinline
780 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
785 switch (tx
->key
->conf
.alg
) {
787 return ieee80211_crypto_wep_encrypt(tx
);
789 return ieee80211_crypto_tkip_encrypt(tx
);
791 return ieee80211_crypto_ccmp_encrypt(tx
);
799 static ieee80211_tx_result debug_noinline
800 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data
*tx
)
802 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
804 int group_addr
= is_multicast_ether_addr(hdr
->addr1
);
806 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
)) {
807 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
, 0);
811 hdr
->duration_id
= ieee80211_duration(tx
, group_addr
,
812 tx
->extra_frag
[0]->len
);
814 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
815 if (i
+ 1 < tx
->num_extra_frag
)
816 next_len
= tx
->extra_frag
[i
+ 1]->len
;
820 hdr
= (struct ieee80211_hdr
*)tx
->extra_frag
[i
]->data
;
821 hdr
->duration_id
= ieee80211_duration(tx
, 0, next_len
);
827 static ieee80211_tx_result debug_noinline
828 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
835 tx
->sta
->tx_packets
++;
836 tx
->sta
->tx_fragments
++;
837 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
838 if (tx
->extra_frag
) {
839 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
840 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
841 tx
->sta
->tx_bytes
+= tx
->extra_frag
[i
]->len
;
848 /* actual transmit path */
851 * deal with packet injection down monitor interface
852 * with Radiotap Header -- only called for monitor mode interface
854 static ieee80211_tx_result
855 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
859 * this is the moment to interpret and discard the radiotap header that
860 * must be at the start of the packet injected in Monitor mode
862 * Need to take some care with endian-ness since radiotap
863 * args are little-endian
866 struct ieee80211_radiotap_iterator iterator
;
867 struct ieee80211_radiotap_header
*rthdr
=
868 (struct ieee80211_radiotap_header
*) skb
->data
;
869 struct ieee80211_supported_band
*sband
;
870 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
872 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
874 skb
->do_not_encrypt
= 1;
875 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
878 * for every radiotap entry that is present
879 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
880 * entries present, or -EINVAL on error)
884 ret
= ieee80211_radiotap_iterator_next(&iterator
);
889 /* see if this argument is something we can use */
890 switch (iterator
.this_arg_index
) {
892 * You must take care when dereferencing iterator.this_arg
893 * for multibyte types... the pointer is not aligned. Use
894 * get_unaligned((type *)iterator.this_arg) to dereference
895 * iterator.this_arg for type "type" safely on all arches.
897 case IEEE80211_RADIOTAP_FLAGS
:
898 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
900 * this indicates that the skb we have been
901 * handed has the 32-bit FCS CRC at the end...
902 * we should react to that by snipping it off
903 * because it will be recomputed and added
906 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
909 skb_trim(skb
, skb
->len
- FCS_LEN
);
911 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
912 tx
->skb
->do_not_encrypt
= 0;
913 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
914 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
918 * Please update the file
919 * Documentation/networking/mac80211-injection.txt
920 * when parsing new fields here.
928 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
932 * remove the radiotap header
933 * iterator->max_length was sanity-checked against
934 * skb->len by iterator init
936 skb_pull(skb
, iterator
.max_length
);
944 static ieee80211_tx_result
945 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
947 struct net_device
*dev
)
949 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
950 struct ieee80211_hdr
*hdr
;
951 struct ieee80211_sub_if_data
*sdata
;
952 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
957 memset(tx
, 0, sizeof(*tx
));
959 tx
->dev
= dev
; /* use original interface */
961 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
962 tx
->channel
= local
->hw
.conf
.channel
;
964 * Set this flag (used below to indicate "automatic fragmentation"),
965 * it will be cleared/left by radiotap as desired.
967 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
969 /* process and remove the injection radiotap header */
970 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
971 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
972 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
976 * __ieee80211_parse_tx_radiotap has now removed
977 * the radiotap header that was present and pre-filled
978 * 'tx' with tx control information.
982 hdr
= (struct ieee80211_hdr
*) skb
->data
;
984 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
986 if (tx
->sta
&& ieee80211_is_data_qos(hdr
->frame_control
)) {
987 qc
= ieee80211_get_qos_ctl(hdr
);
988 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
990 state
= &tx
->sta
->ampdu_mlme
.tid_state_tx
[tid
];
991 if (*state
== HT_AGG_STATE_OPERATIONAL
)
992 info
->flags
|= IEEE80211_TX_CTL_AMPDU
;
995 if (is_multicast_ether_addr(hdr
->addr1
)) {
996 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
997 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
999 tx
->flags
|= IEEE80211_TX_UNICAST
;
1000 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
1003 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
1004 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
1005 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1006 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1007 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
1009 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
1013 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1014 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
1015 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1017 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1018 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1019 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1020 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1022 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1028 * NB: @tx is uninitialised when passed in here
1030 static int ieee80211_tx_prepare(struct ieee80211_local
*local
,
1031 struct ieee80211_tx_data
*tx
,
1032 struct sk_buff
*skb
)
1034 struct net_device
*dev
;
1036 dev
= dev_get_by_index(&init_net
, skb
->iif
);
1037 if (unlikely(dev
&& !is_ieee80211_device(local
, dev
))) {
1043 /* initialises tx with control */
1044 __ieee80211_tx_prepare(tx
, skb
, dev
);
1049 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1050 struct ieee80211_tx_data
*tx
)
1052 struct ieee80211_tx_info
*info
;
1056 if (netif_subqueue_stopped(local
->mdev
, skb
))
1057 return IEEE80211_TX_AGAIN
;
1058 info
= IEEE80211_SKB_CB(skb
);
1060 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1062 return IEEE80211_TX_AGAIN
;
1063 local
->mdev
->trans_start
= jiffies
;
1064 ieee80211_led_tx(local
, 1);
1066 if (tx
->extra_frag
) {
1067 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1068 if (!tx
->extra_frag
[i
])
1070 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1071 info
->flags
&= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1072 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1073 if (netif_subqueue_stopped(local
->mdev
,
1075 return IEEE80211_TX_FRAG_AGAIN
;
1077 ret
= local
->ops
->tx(local_to_hw(local
),
1080 return IEEE80211_TX_FRAG_AGAIN
;
1081 local
->mdev
->trans_start
= jiffies
;
1082 ieee80211_led_tx(local
, 1);
1083 tx
->extra_frag
[i
] = NULL
;
1085 kfree(tx
->extra_frag
);
1086 tx
->extra_frag
= NULL
;
1088 return IEEE80211_TX_OK
;
1092 * Invoke TX handlers, return 0 on success and non-zero if the
1093 * frame was dropped or queued.
1095 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1097 struct sk_buff
*skb
= tx
->skb
;
1098 ieee80211_tx_result res
= TX_DROP
;
1101 #define CALL_TXH(txh) \
1103 if (res != TX_CONTINUE) \
1106 CALL_TXH(ieee80211_tx_h_check_assoc
)
1107 CALL_TXH(ieee80211_tx_h_ps_buf
)
1108 CALL_TXH(ieee80211_tx_h_select_key
)
1109 CALL_TXH(ieee80211_tx_h_michael_mic_add
)
1110 CALL_TXH(ieee80211_tx_h_rate_ctrl
)
1111 CALL_TXH(ieee80211_tx_h_misc
)
1112 CALL_TXH(ieee80211_tx_h_sequence
)
1113 CALL_TXH(ieee80211_tx_h_fragment
)
1114 /* handlers after fragment must be aware of tx info fragmentation! */
1115 CALL_TXH(ieee80211_tx_h_encrypt
)
1116 CALL_TXH(ieee80211_tx_h_calculate_duration
)
1117 CALL_TXH(ieee80211_tx_h_stats
)
1121 if (unlikely(res
== TX_DROP
)) {
1122 I802_DEBUG_INC(tx
->local
->tx_handlers_drop
);
1124 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1125 if (tx
->extra_frag
[i
])
1126 dev_kfree_skb(tx
->extra_frag
[i
]);
1127 kfree(tx
->extra_frag
);
1129 } else if (unlikely(res
== TX_QUEUED
)) {
1130 I802_DEBUG_INC(tx
->local
->tx_handlers_queued
);
1137 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1139 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1140 struct sta_info
*sta
;
1141 struct ieee80211_tx_data tx
;
1142 ieee80211_tx_result res_prepare
;
1143 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1147 queue
= skb_get_queue_mapping(skb
);
1149 WARN_ON(test_bit(queue
, local
->queues_pending
));
1151 if (unlikely(skb
->len
< 10)) {
1158 /* initialises tx */
1159 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1161 if (res_prepare
== TX_DROP
) {
1168 tx
.channel
= local
->hw
.conf
.channel
;
1169 info
->band
= tx
.channel
->band
;
1171 if (invoke_tx_handlers(&tx
))
1175 ret
= __ieee80211_tx(local
, skb
, &tx
);
1177 struct ieee80211_tx_stored_packet
*store
;
1180 * Since there are no fragmented frames on A-MPDU
1181 * queues, there's no reason for a driver to reject
1182 * a frame there, warn and drop it.
1184 if (WARN_ON(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
1187 store
= &local
->pending_packet
[queue
];
1189 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1192 set_bit(queue
, local
->queues_pending
);
1195 * When the driver gets out of buffers during sending of
1196 * fragments and calls ieee80211_stop_queue, the netif
1197 * subqueue is stopped. There is, however, a small window
1198 * in which the PENDING bit is not yet set. If a buffer
1199 * gets available in that window (i.e. driver calls
1200 * ieee80211_wake_queue), we would end up with ieee80211_tx
1201 * called with the PENDING bit still set. Prevent this by
1202 * continuing transmitting here when that situation is
1203 * possible to have happened.
1205 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1206 clear_bit(queue
, local
->queues_pending
);
1210 store
->extra_frag
= tx
.extra_frag
;
1211 store
->num_extra_frag
= tx
.num_extra_frag
;
1220 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1221 if (tx
.extra_frag
[i
])
1222 dev_kfree_skb(tx
.extra_frag
[i
]);
1223 kfree(tx
.extra_frag
);
1228 /* device xmit handlers */
1230 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1231 struct sk_buff
*skb
,
1232 int head_need
, bool may_encrypt
)
1237 * This could be optimised, devices that do full hardware
1238 * crypto (including TKIP MMIC) need no tailroom... But we
1239 * have no drivers for such devices currently.
1242 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1243 tail_need
-= skb_tailroom(skb
);
1244 tail_need
= max_t(int, tail_need
, 0);
1247 if (head_need
|| tail_need
) {
1248 /* Sorry. Can't account for this any more */
1252 if (skb_header_cloned(skb
))
1253 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1255 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1257 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1258 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1259 wiphy_name(local
->hw
.wiphy
));
1263 /* update truesize too */
1264 skb
->truesize
+= head_need
+ tail_need
;
1269 int ieee80211_master_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1271 struct ieee80211_master_priv
*mpriv
= netdev_priv(dev
);
1272 struct ieee80211_local
*local
= mpriv
->local
;
1273 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1274 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1275 struct net_device
*odev
= NULL
;
1276 struct ieee80211_sub_if_data
*osdata
;
1283 } monitor_iface
= NOT_MONITOR
;
1287 odev
= dev_get_by_index(&init_net
, skb
->iif
);
1288 if (unlikely(odev
&& !is_ieee80211_device(local
, odev
))) {
1292 if (unlikely(!odev
)) {
1293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1294 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1295 "originating device\n", dev
->name
);
1301 memset(info
, 0, sizeof(*info
));
1303 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1305 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1307 if (ieee80211_vif_is_mesh(&osdata
->vif
) &&
1308 ieee80211_is_data(hdr
->frame_control
)) {
1309 if (is_multicast_ether_addr(hdr
->addr3
))
1310 memcpy(hdr
->addr1
, hdr
->addr3
, ETH_ALEN
);
1312 if (mesh_nexthop_lookup(skb
, osdata
)) {
1316 if (memcmp(odev
->dev_addr
, hdr
->addr4
, ETH_ALEN
) != 0)
1317 IEEE80211_IFSTA_MESH_CTR_INC(&osdata
->u
.mesh
,
1319 } else if (unlikely(osdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)) {
1320 struct ieee80211_sub_if_data
*sdata
;
1324 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
1325 monitor_iface
= UNKNOWN_ADDRESS
;
1327 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1328 hdr
= (struct ieee80211_hdr
*)skb
->data
+ len_rthdr
;
1329 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1331 /* check the header is complete in the frame */
1332 if (likely(skb
->len
>= len_rthdr
+ hdrlen
)) {
1334 * We process outgoing injected frames that have a
1335 * local address we handle as though they are our
1337 * This code here isn't entirely correct, the local
1338 * MAC address is not necessarily enough to find
1339 * the interface to use; for that proper VLAN/WDS
1340 * support we will need a different mechanism.
1344 list_for_each_entry_rcu(sdata
, &local
->interfaces
,
1346 if (!netif_running(sdata
->dev
))
1348 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1350 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1352 dev_hold(sdata
->dev
);
1356 skb
->iif
= sdata
->dev
->ifindex
;
1357 monitor_iface
= FOUND_SDATA
;
1365 may_encrypt
= !skb
->do_not_encrypt
;
1367 headroom
= osdata
->local
->tx_headroom
;
1369 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1370 headroom
-= skb_headroom(skb
);
1371 headroom
= max_t(int, 0, headroom
);
1373 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1379 if (osdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1380 osdata
= container_of(osdata
->bss
,
1381 struct ieee80211_sub_if_data
,
1383 if (likely(monitor_iface
!= UNKNOWN_ADDRESS
))
1384 info
->control
.vif
= &osdata
->vif
;
1385 ret
= ieee80211_tx(odev
, skb
);
1391 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1392 struct net_device
*dev
)
1394 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1395 struct ieee80211_radiotap_header
*prthdr
=
1396 (struct ieee80211_radiotap_header
*)skb
->data
;
1399 /* check for not even having the fixed radiotap header part */
1400 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1401 goto fail
; /* too short to be possibly valid */
1403 /* is it a header version we can trust to find length from? */
1404 if (unlikely(prthdr
->it_version
))
1405 goto fail
; /* only version 0 is supported */
1407 /* then there must be a radiotap header with a length we can use */
1408 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1410 /* does the skb contain enough to deliver on the alleged length? */
1411 if (unlikely(skb
->len
< len_rthdr
))
1412 goto fail
; /* skb too short for claimed rt header extent */
1414 skb
->dev
= local
->mdev
;
1416 /* needed because we set skb device to master */
1417 skb
->iif
= dev
->ifindex
;
1419 /* sometimes we do encrypt injected frames, will be fixed
1420 * up in radiotap parser if not wanted */
1421 skb
->do_not_encrypt
= 0;
1424 * fix up the pointers accounting for the radiotap
1425 * header still being in there. We are being given
1426 * a precooked IEEE80211 header so no need for
1429 skb_set_mac_header(skb
, len_rthdr
);
1431 * these are just fixed to the end of the rt area since we
1432 * don't have any better information and at this point, nobody cares
1434 skb_set_network_header(skb
, len_rthdr
);
1435 skb_set_transport_header(skb
, len_rthdr
);
1437 /* pass the radiotap header up to the next stage intact */
1438 dev_queue_xmit(skb
);
1439 return NETDEV_TX_OK
;
1443 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1447 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1448 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1449 * @skb: packet to be sent
1450 * @dev: incoming interface
1452 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1453 * not be freed, and caller is responsible for either retrying later or freeing
1456 * This function takes in an Ethernet header and encapsulates it with suitable
1457 * IEEE 802.11 header based on which interface the packet is coming in. The
1458 * encapsulated packet will then be passed to master interface, wlan#.11, for
1459 * transmission (through low-level driver).
1461 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1462 struct net_device
*dev
)
1464 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1465 struct ieee80211_local
*local
= sdata
->local
;
1466 int ret
= 1, head_need
;
1467 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1469 struct ieee80211_hdr hdr
;
1470 struct ieee80211s_hdr mesh_hdr
;
1471 const u8
*encaps_data
;
1472 int encaps_len
, skip_header_bytes
;
1474 struct sta_info
*sta
;
1477 if (unlikely(skb
->len
< ETH_HLEN
)) {
1482 if (!(local
->hw
.flags
& IEEE80211_HW_NO_STACK_DYNAMIC_PS
) &&
1483 local
->dynamic_ps_timeout
> 0) {
1484 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
1485 ieee80211_stop_queues_by_reason(&local
->hw
,
1486 IEEE80211_QUEUE_STOP_REASON_PS
);
1487 queue_work(local
->hw
.workqueue
,
1488 &local
->dynamic_ps_disable_work
);
1491 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1492 msecs_to_jiffies(local
->dynamic_ps_timeout
));
1495 nh_pos
= skb_network_header(skb
) - skb
->data
;
1496 h_pos
= skb_transport_header(skb
) - skb
->data
;
1498 /* convert Ethernet header to proper 802.11 header (based on
1499 * operation mode) */
1500 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1501 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1503 switch (sdata
->vif
.type
) {
1504 case NL80211_IFTYPE_AP
:
1505 case NL80211_IFTYPE_AP_VLAN
:
1506 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1508 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1509 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1510 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1513 case NL80211_IFTYPE_WDS
:
1514 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1516 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1517 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1518 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1519 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1522 #ifdef CONFIG_MAC80211_MESH
1523 case NL80211_IFTYPE_MESH_POINT
:
1524 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1525 if (!sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
) {
1526 /* Do not send frames with mesh_ttl == 0 */
1527 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1531 memset(&mesh_hdr
, 0, sizeof(mesh_hdr
));
1533 if (compare_ether_addr(dev
->dev_addr
,
1534 skb
->data
+ ETH_ALEN
) == 0) {
1536 memset(hdr
.addr1
, 0, ETH_ALEN
);
1537 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1538 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1539 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1540 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
, sdata
);
1542 /* packet from other interface */
1543 struct mesh_path
*mppath
;
1545 memset(hdr
.addr1
, 0, ETH_ALEN
);
1546 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1547 memcpy(hdr
.addr4
, dev
->dev_addr
, ETH_ALEN
);
1549 if (is_multicast_ether_addr(skb
->data
))
1550 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1553 mppath
= mpp_path_lookup(skb
->data
, sdata
);
1555 memcpy(hdr
.addr3
, mppath
->mpp
, ETH_ALEN
);
1557 memset(hdr
.addr3
, 0xff, ETH_ALEN
);
1561 mesh_hdr
.flags
|= MESH_FLAGS_AE_A5_A6
;
1562 mesh_hdr
.ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
1563 put_unaligned(cpu_to_le32(sdata
->u
.mesh
.mesh_seqnum
), &mesh_hdr
.seqnum
);
1564 memcpy(mesh_hdr
.eaddr1
, skb
->data
, ETH_ALEN
);
1565 memcpy(mesh_hdr
.eaddr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1566 sdata
->u
.mesh
.mesh_seqnum
++;
1572 case NL80211_IFTYPE_STATION
:
1573 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1575 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1576 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1577 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1580 case NL80211_IFTYPE_ADHOC
:
1582 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1583 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1584 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1593 * There's no need to try to look up the destination
1594 * if it is a multicast address (which can only happen
1597 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1599 sta
= sta_info_get(local
, hdr
.addr1
);
1601 sta_flags
= get_sta_flags(sta
);
1605 /* receiver and we are QoS enabled, use a QoS type frame */
1606 if (sta_flags
& WLAN_STA_WME
&&
1607 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1608 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1613 * Drop unicast frames to unauthorised stations unless they are
1614 * EAPOL frames from the local station.
1616 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
1617 unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1618 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1619 !(ethertype
== ETH_P_PAE
&&
1620 compare_ether_addr(dev
->dev_addr
,
1621 skb
->data
+ ETH_ALEN
) == 0))) {
1622 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1623 if (net_ratelimit())
1624 printk(KERN_DEBUG
"%s: dropped frame to %pM"
1625 " (unauthorized port)\n", dev
->name
,
1629 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1635 hdr
.frame_control
= fc
;
1636 hdr
.duration_id
= 0;
1639 skip_header_bytes
= ETH_HLEN
;
1640 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1641 encaps_data
= bridge_tunnel_header
;
1642 encaps_len
= sizeof(bridge_tunnel_header
);
1643 skip_header_bytes
-= 2;
1644 } else if (ethertype
>= 0x600) {
1645 encaps_data
= rfc1042_header
;
1646 encaps_len
= sizeof(rfc1042_header
);
1647 skip_header_bytes
-= 2;
1653 skb_pull(skb
, skip_header_bytes
);
1654 nh_pos
-= skip_header_bytes
;
1655 h_pos
-= skip_header_bytes
;
1657 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1660 * So we need to modify the skb header and hence need a copy of
1661 * that. The head_need variable above doesn't, so far, include
1662 * the needed header space that we don't need right away. If we
1663 * can, then we don't reallocate right now but only after the
1664 * frame arrives at the master device (if it does...)
1666 * If we cannot, however, then we will reallocate to include all
1667 * the ever needed space. Also, if we need to reallocate it anyway,
1668 * make it big enough for everything we may ever need.
1671 if (head_need
> 0 || skb_cloned(skb
)) {
1672 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1673 head_need
+= local
->tx_headroom
;
1674 head_need
= max_t(int, 0, head_need
);
1675 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1680 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1681 nh_pos
+= encaps_len
;
1682 h_pos
+= encaps_len
;
1685 if (meshhdrlen
> 0) {
1686 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1687 nh_pos
+= meshhdrlen
;
1688 h_pos
+= meshhdrlen
;
1691 if (ieee80211_is_data_qos(fc
)) {
1692 __le16
*qos_control
;
1694 qos_control
= (__le16
*) skb_push(skb
, 2);
1695 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1697 * Maybe we could actually set some fields here, for now just
1698 * initialise to zero to indicate no special operation.
1702 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1707 skb
->iif
= dev
->ifindex
;
1709 skb
->dev
= local
->mdev
;
1710 dev
->stats
.tx_packets
++;
1711 dev
->stats
.tx_bytes
+= skb
->len
;
1713 /* Update skb pointers to various headers since this modified frame
1714 * is going to go through Linux networking code that may potentially
1715 * need things like pointer to IP header. */
1716 skb_set_mac_header(skb
, 0);
1717 skb_set_network_header(skb
, nh_pos
);
1718 skb_set_transport_header(skb
, h_pos
);
1720 dev
->trans_start
= jiffies
;
1721 dev_queue_xmit(skb
);
1734 * ieee80211_clear_tx_pending may not be called in a context where
1735 * it is possible that it packets could come in again.
1737 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1740 struct ieee80211_tx_stored_packet
*store
;
1742 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1743 if (!test_bit(i
, local
->queues_pending
))
1745 store
= &local
->pending_packet
[i
];
1746 kfree_skb(store
->skb
);
1747 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1748 kfree_skb(store
->extra_frag
[j
]);
1749 kfree(store
->extra_frag
);
1750 clear_bit(i
, local
->queues_pending
);
1755 * Transmit all pending packets. Called from tasklet, locks master device
1756 * TX lock so that no new packets can come in.
1758 void ieee80211_tx_pending(unsigned long data
)
1760 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1761 struct net_device
*dev
= local
->mdev
;
1762 struct ieee80211_tx_stored_packet
*store
;
1763 struct ieee80211_tx_data tx
;
1766 netif_tx_lock_bh(dev
);
1767 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1768 /* Check that this queue is ok */
1769 if (__netif_subqueue_stopped(local
->mdev
, i
) &&
1770 !test_bit(i
, local
->queues_pending_run
))
1773 if (!test_bit(i
, local
->queues_pending
)) {
1774 clear_bit(i
, local
->queues_pending_run
);
1775 ieee80211_wake_queue(&local
->hw
, i
);
1779 clear_bit(i
, local
->queues_pending_run
);
1780 netif_start_subqueue(local
->mdev
, i
);
1782 store
= &local
->pending_packet
[i
];
1783 tx
.extra_frag
= store
->extra_frag
;
1784 tx
.num_extra_frag
= store
->num_extra_frag
;
1786 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1788 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1791 clear_bit(i
, local
->queues_pending
);
1792 ieee80211_wake_queue(&local
->hw
, i
);
1795 netif_tx_unlock_bh(dev
);
1798 /* functions for drivers to get certain frames */
1800 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap
*bss
,
1801 struct sk_buff
*skb
,
1802 struct beacon_data
*beacon
)
1806 int i
, have_bits
= 0, n1
, n2
;
1808 /* Generate bitmap for TIM only if there are any STAs in power save
1810 if (atomic_read(&bss
->num_sta_ps
) > 0)
1811 /* in the hope that this is faster than
1812 * checking byte-for-byte */
1813 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1814 IEEE80211_MAX_AID
+1);
1816 if (bss
->dtim_count
== 0)
1817 bss
->dtim_count
= beacon
->dtim_period
- 1;
1821 tim
= pos
= (u8
*) skb_put(skb
, 6);
1822 *pos
++ = WLAN_EID_TIM
;
1824 *pos
++ = bss
->dtim_count
;
1825 *pos
++ = beacon
->dtim_period
;
1827 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1831 /* Find largest even number N1 so that bits numbered 1 through
1832 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1833 * (N2 + 1) x 8 through 2007 are 0. */
1835 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1842 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1849 /* Bitmap control */
1851 /* Part Virt Bitmap */
1852 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1854 tim
[1] = n2
- n1
+ 4;
1855 skb_put(skb
, n2
- n1
);
1857 *pos
++ = aid0
; /* Bitmap control */
1858 *pos
++ = 0; /* Part Virt Bitmap */
1862 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1863 struct ieee80211_vif
*vif
)
1865 struct ieee80211_local
*local
= hw_to_local(hw
);
1866 struct sk_buff
*skb
= NULL
;
1867 struct ieee80211_tx_info
*info
;
1868 struct ieee80211_sub_if_data
*sdata
= NULL
;
1869 struct ieee80211_if_ap
*ap
= NULL
;
1870 struct ieee80211_if_sta
*ifsta
= NULL
;
1871 struct beacon_data
*beacon
;
1872 struct ieee80211_supported_band
*sband
;
1873 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1875 sband
= local
->hw
.wiphy
->bands
[band
];
1879 sdata
= vif_to_sdata(vif
);
1881 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
1883 beacon
= rcu_dereference(ap
->beacon
);
1886 * headroom, head length,
1887 * tail length and maximum TIM length
1889 skb
= dev_alloc_skb(local
->tx_headroom
+
1891 beacon
->tail_len
+ 256);
1895 skb_reserve(skb
, local
->tx_headroom
);
1896 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1900 * Not very nice, but we want to allow the driver to call
1901 * ieee80211_beacon_get() as a response to the set_tim()
1902 * callback. That, however, is already invoked under the
1903 * sta_lock to guarantee consistent and race-free update
1904 * of the tim bitmap in mac80211 and the driver.
1906 if (local
->tim_in_locked_section
) {
1907 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1909 unsigned long flags
;
1911 spin_lock_irqsave(&local
->sta_lock
, flags
);
1912 ieee80211_beacon_add_tim(ap
, skb
, beacon
);
1913 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1917 memcpy(skb_put(skb
, beacon
->tail_len
),
1918 beacon
->tail
, beacon
->tail_len
);
1921 } else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1922 struct ieee80211_hdr
*hdr
;
1923 ifsta
= &sdata
->u
.sta
;
1925 if (!ifsta
->probe_resp
)
1928 skb
= skb_copy(ifsta
->probe_resp
, GFP_ATOMIC
);
1932 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1933 hdr
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1934 IEEE80211_STYPE_BEACON
);
1936 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1937 struct ieee80211_mgmt
*mgmt
;
1940 /* headroom, head length, tail length and maximum TIM length */
1941 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1945 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1946 mgmt
= (struct ieee80211_mgmt
*)
1947 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
1948 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
1949 mgmt
->frame_control
=
1950 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
1951 memset(mgmt
->da
, 0xff, ETH_ALEN
);
1952 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1953 /* BSSID is left zeroed, wildcard value */
1954 mgmt
->u
.beacon
.beacon_int
=
1955 cpu_to_le16(local
->hw
.conf
.beacon_int
);
1956 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
1958 pos
= skb_put(skb
, 2);
1959 *pos
++ = WLAN_EID_SSID
;
1962 mesh_mgmt_ies_add(skb
, sdata
);
1968 info
= IEEE80211_SKB_CB(skb
);
1970 skb
->do_not_encrypt
= 1;
1974 * XXX: For now, always use the lowest rate
1976 info
->control
.rates
[0].idx
= 0;
1977 info
->control
.rates
[0].count
= 1;
1978 info
->control
.rates
[1].idx
= -1;
1979 info
->control
.rates
[2].idx
= -1;
1980 info
->control
.rates
[3].idx
= -1;
1981 info
->control
.rates
[4].idx
= -1;
1982 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES
!= 5);
1984 info
->control
.vif
= vif
;
1986 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1987 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1988 info
->flags
|= IEEE80211_TX_CTL_ASSIGN_SEQ
;
1993 EXPORT_SYMBOL(ieee80211_beacon_get
);
1995 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1996 const void *frame
, size_t frame_len
,
1997 const struct ieee80211_tx_info
*frame_txctl
,
1998 struct ieee80211_rts
*rts
)
2000 const struct ieee80211_hdr
*hdr
= frame
;
2002 rts
->frame_control
=
2003 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
2004 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
2006 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
2007 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
2009 EXPORT_SYMBOL(ieee80211_rts_get
);
2011 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
2012 const void *frame
, size_t frame_len
,
2013 const struct ieee80211_tx_info
*frame_txctl
,
2014 struct ieee80211_cts
*cts
)
2016 const struct ieee80211_hdr
*hdr
= frame
;
2018 cts
->frame_control
=
2019 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
2020 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
2021 frame_len
, frame_txctl
);
2022 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
2024 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
2027 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
2028 struct ieee80211_vif
*vif
)
2030 struct ieee80211_local
*local
= hw_to_local(hw
);
2031 struct sk_buff
*skb
= NULL
;
2032 struct sta_info
*sta
;
2033 struct ieee80211_tx_data tx
;
2034 struct ieee80211_sub_if_data
*sdata
;
2035 struct ieee80211_if_ap
*bss
= NULL
;
2036 struct beacon_data
*beacon
;
2037 struct ieee80211_tx_info
*info
;
2039 sdata
= vif_to_sdata(vif
);
2046 beacon
= rcu_dereference(bss
->beacon
);
2048 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
|| !beacon
|| !beacon
->head
)
2051 if (bss
->dtim_count
!= 0)
2052 goto out
; /* send buffered bc/mc only after DTIM beacon */
2055 skb
= skb_dequeue(&bss
->ps_bc_buf
);
2058 local
->total_ps_buffered
--;
2060 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
2061 struct ieee80211_hdr
*hdr
=
2062 (struct ieee80211_hdr
*) skb
->data
;
2063 /* more buffered multicast/broadcast frames ==> set
2064 * MoreData flag in IEEE 802.11 header to inform PS
2066 hdr
->frame_control
|=
2067 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2070 if (!ieee80211_tx_prepare(local
, &tx
, skb
))
2072 dev_kfree_skb_any(skb
);
2075 info
= IEEE80211_SKB_CB(skb
);
2078 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2079 tx
.channel
= local
->hw
.conf
.channel
;
2080 info
->band
= tx
.channel
->band
;
2082 if (invoke_tx_handlers(&tx
))
2089 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);