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 <net/ieee80211_radiotap.h>
21 #include <net/cfg80211.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "ieee80211_led.h"
30 #include "ieee80211_rate.h"
32 #define IEEE80211_TX_OK 0
33 #define IEEE80211_TX_AGAIN 1
34 #define IEEE80211_TX_FRAG_AGAIN 2
38 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
39 struct ieee80211_hdr
*hdr
)
41 /* Set the sequence number for this frame. */
42 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
44 /* Increase the sequence number. */
45 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
48 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
49 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
50 const struct sk_buff
*skb
)
52 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
56 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
62 fc
= le16_to_cpu(hdr
->frame_control
);
63 hdrlen
= ieee80211_get_hdrlen(fc
);
64 if (hdrlen
> skb
->len
)
67 printk(" FC=0x%04x DUR=0x%04x",
68 fc
, le16_to_cpu(hdr
->duration_id
));
70 printk(" A1=" MAC_FMT
, MAC_ARG(hdr
->addr1
));
72 printk(" A2=" MAC_FMT
, MAC_ARG(hdr
->addr2
));
74 printk(" A3=" MAC_FMT
, MAC_ARG(hdr
->addr3
));
76 printk(" A4=" MAC_FMT
, MAC_ARG(hdr
->addr4
));
79 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
80 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
84 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
86 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
89 int rate
, mrate
, erp
, dur
, i
;
90 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
91 struct ieee80211_local
*local
= tx
->local
;
92 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
94 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
97 * data and mgmt (except PS Poll):
99 * - during contention period:
100 * if addr1 is group address: 0
101 * if more fragments = 0 and addr1 is individual address: time to
102 * transmit one ACK plus SIFS
103 * if more fragments = 1 and addr1 is individual address: time to
104 * transmit next fragment plus 2 x ACK plus 3 x SIFS
107 * - control response frame (CTS or ACK) shall be transmitted using the
108 * same rate as the immediately previous frame in the frame exchange
109 * sequence, if this rate belongs to the PHY mandatory rates, or else
110 * at the highest possible rate belonging to the PHY rates in the
114 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
115 /* TODO: These control frames are not currently sent by
116 * 80211.o, but should they be implemented, this function
117 * needs to be updated to support duration field calculation.
119 * RTS: time needed to transmit pending data/mgmt frame plus
120 * one CTS frame plus one ACK frame plus 3 x SIFS
121 * CTS: duration of immediately previous RTS minus time
122 * required to transmit CTS and its SIFS
123 * ACK: 0 if immediately previous directed data/mgmt had
124 * more=0, with more=1 duration in ACK frame is duration
125 * from previous frame minus time needed to transmit ACK
127 * PS Poll: BIT(15) | BIT(14) | aid
133 if (0 /* FIX: data/mgmt during CFP */)
136 if (group_addr
) /* Group address as the destination - no ACK */
139 /* Individual destination address:
140 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
141 * CTS and ACK frames shall be transmitted using the highest rate in
142 * basic rate set that is less than or equal to the rate of the
143 * immediately previous frame and that is using the same modulation
144 * (CCK or OFDM). If no basic rate set matches with these requirements,
145 * the highest mandatory rate of the PHY that is less than or equal to
146 * the rate of the previous frame is used.
147 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
150 mrate
= 10; /* use 1 Mbps if everything fails */
151 for (i
= 0; i
< mode
->num_rates
; i
++) {
152 struct ieee80211_rate
*r
= &mode
->rates
[i
];
153 if (r
->rate
> txrate
->rate
)
156 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
157 IEEE80211_RATE_MODULATION(r
->flags
))
160 if (r
->flags
& IEEE80211_RATE_BASIC
)
162 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
166 /* No matching basic rate found; use highest suitable mandatory
171 /* Time needed to transmit ACK
172 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
173 * to closest integer */
175 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
176 local
->short_preamble
);
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur
*= 2; /* ACK + SIFS */
183 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
185 local
->short_preamble
);
191 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
194 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
197 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
200 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
203 static int inline is_ieee80211_device(struct net_device
*dev
,
204 struct net_device
*master
)
206 return (wdev_priv(dev
->ieee80211_ptr
) ==
207 wdev_priv(master
->ieee80211_ptr
));
212 static ieee80211_txrx_result
213 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
215 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
216 struct sk_buff
*skb
= tx
->skb
;
217 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
218 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
221 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
222 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
223 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
226 if (tx
->u
.tx
.ps_buffered
)
227 return TXRX_CONTINUE
;
229 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
231 if (likely(tx
->u
.tx
.unicast
)) {
232 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
233 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
234 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
236 printk(KERN_DEBUG
"%s: dropped data frame to not "
237 "associated station " MAC_FMT
"\n",
238 tx
->dev
->name
, MAC_ARG(hdr
->addr1
));
239 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
240 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
244 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
245 tx
->local
->num_sta
== 0 &&
246 !tx
->local
->allow_broadcast_always
&&
247 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
249 * No associated STAs - no need to send multicast
254 return TXRX_CONTINUE
;
257 if (unlikely(!tx
->u
.tx
.mgmt_interface
&& tx
->sdata
->ieee802_1x
&&
258 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
259 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
260 printk(KERN_DEBUG
"%s: dropped frame to " MAC_FMT
261 " (unauthorized port)\n", tx
->dev
->name
,
262 MAC_ARG(hdr
->addr1
));
264 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
268 return TXRX_CONTINUE
;
271 static ieee80211_txrx_result
272 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
274 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
276 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
277 ieee80211_include_sequence(tx
->sdata
, hdr
);
279 return TXRX_CONTINUE
;
282 /* This function is called whenever the AP is about to exceed the maximum limit
283 * of buffered frames for power saving STAs. This situation should not really
284 * happen often during normal operation, so dropping the oldest buffered packet
285 * from each queue should be OK to make some room for new frames. */
286 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
288 int total
= 0, purged
= 0;
290 struct ieee80211_sub_if_data
*sdata
;
291 struct sta_info
*sta
;
293 read_lock(&local
->sub_if_lock
);
294 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
295 struct ieee80211_if_ap
*ap
;
296 if (sdata
->dev
== local
->mdev
||
297 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
300 skb
= skb_dequeue(&ap
->ps_bc_buf
);
305 total
+= skb_queue_len(&ap
->ps_bc_buf
);
307 read_unlock(&local
->sub_if_lock
);
309 read_lock_bh(&local
->sta_lock
);
310 list_for_each_entry(sta
, &local
->sta_list
, list
) {
311 skb
= skb_dequeue(&sta
->ps_tx_buf
);
316 total
+= skb_queue_len(&sta
->ps_tx_buf
);
318 read_unlock_bh(&local
->sta_lock
);
320 local
->total_ps_buffered
= total
;
321 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
322 local
->mdev
->name
, purged
);
325 static inline ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
328 /* broadcast/multicast frame */
329 /* If any of the associated stations is in power save mode,
330 * the frame is buffered to be sent after DTIM beacon frame */
331 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
332 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
333 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
334 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
335 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
336 purge_old_ps_buffers(tx
->local
);
337 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
339 if (net_ratelimit()) {
340 printk(KERN_DEBUG
"%s: BC TX buffer full - "
341 "dropping the oldest frame\n",
344 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
346 tx
->local
->total_ps_buffered
++;
347 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
351 return TXRX_CONTINUE
;
354 static inline ieee80211_txrx_result
355 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
357 struct sta_info
*sta
= tx
->sta
;
360 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
361 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
362 return TXRX_CONTINUE
;
364 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
365 struct ieee80211_tx_packet_data
*pkt_data
;
366 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
367 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS buffer (entries "
369 MAC_ARG(sta
->addr
), sta
->aid
,
370 skb_queue_len(&sta
->ps_tx_buf
));
371 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
372 sta
->flags
|= WLAN_STA_TIM
;
373 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
374 purge_old_ps_buffers(tx
->local
);
375 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
376 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
377 if (net_ratelimit()) {
378 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" TX "
379 "buffer full - dropping oldest frame\n",
380 tx
->dev
->name
, MAC_ARG(sta
->addr
));
384 tx
->local
->total_ps_buffered
++;
385 /* Queue frame to be sent after STA sends an PS Poll frame */
386 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
387 if (tx
->local
->ops
->set_tim
)
388 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
391 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
393 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
394 pkt_data
->jiffies
= jiffies
;
395 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
398 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
399 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
400 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" in PS mode, but pspoll "
401 "set -> send frame\n", tx
->dev
->name
,
404 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 return TXRX_CONTINUE
;
411 static ieee80211_txrx_result
412 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
414 if (unlikely(tx
->u
.tx
.ps_buffered
))
415 return TXRX_CONTINUE
;
417 if (tx
->u
.tx
.unicast
)
418 return ieee80211_tx_h_unicast_ps_buf(tx
);
420 return ieee80211_tx_h_multicast_ps_buf(tx
);
426 static ieee80211_txrx_result
427 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
430 tx
->u
.tx
.control
->key_idx
= tx
->sta
->key_idx_compression
;
432 tx
->u
.tx
.control
->key_idx
= HW_KEY_IDX_INVALID
;
434 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
436 else if (tx
->sta
&& tx
->sta
->key
)
437 tx
->key
= tx
->sta
->key
;
438 else if (tx
->sdata
->default_key
)
439 tx
->key
= tx
->sdata
->default_key
;
440 else if (tx
->sdata
->drop_unencrypted
&&
441 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
442 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
448 tx
->key
->tx_rx_count
++;
449 if (unlikely(tx
->local
->key_tx_rx_threshold
&&
450 tx
->key
->tx_rx_count
>
451 tx
->local
->key_tx_rx_threshold
)) {
452 ieee80211_key_threshold_notify(tx
->dev
, tx
->key
,
457 return TXRX_CONTINUE
;
460 static ieee80211_txrx_result
461 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
463 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
464 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
465 struct sk_buff
**frags
, *first
, *frag
;
469 int frag_threshold
= tx
->local
->fragmentation_threshold
;
472 return TXRX_CONTINUE
;
476 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
477 payload_len
= first
->len
- hdrlen
;
478 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
479 num_fragm
= (payload_len
+ per_fragm
- 1) / per_fragm
;
481 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
485 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
486 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
487 pos
= first
->data
+ hdrlen
+ per_fragm
;
488 left
= payload_len
- per_fragm
;
489 for (i
= 0; i
< num_fragm
- 1; i
++) {
490 struct ieee80211_hdr
*fhdr
;
496 /* reserve enough extra head and tail room for possible
499 dev_alloc_skb(tx
->local
->tx_headroom
+
501 IEEE80211_ENCRYPT_HEADROOM
+
502 IEEE80211_ENCRYPT_TAILROOM
);
505 /* Make sure that all fragments use the same priority so
506 * that they end up using the same TX queue */
507 frag
->priority
= first
->priority
;
508 skb_reserve(frag
, tx
->local
->tx_headroom
+
509 IEEE80211_ENCRYPT_HEADROOM
);
510 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
511 memcpy(fhdr
, first
->data
, hdrlen
);
512 if (i
== num_fragm
- 2)
513 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
514 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
515 copylen
= left
> per_fragm
? per_fragm
: left
;
516 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
521 skb_trim(first
, hdrlen
+ per_fragm
);
523 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
524 tx
->u
.tx
.extra_frag
= frags
;
526 return TXRX_CONTINUE
;
529 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
531 for (i
= 0; i
< num_fragm
- 1; i
++)
533 dev_kfree_skb(frags
[i
]);
536 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
540 static int wep_encrypt_skb(struct ieee80211_txrx_data
*tx
, struct sk_buff
*skb
)
542 if (tx
->key
->force_sw_encrypt
) {
543 if (ieee80211_wep_encrypt(tx
->local
, skb
, tx
->key
))
546 tx
->u
.tx
.control
->key_idx
= tx
->key
->hw_key_idx
;
547 if (tx
->local
->hw
.flags
& IEEE80211_HW_WEP_INCLUDE_IV
) {
548 if (ieee80211_wep_add_iv(tx
->local
, skb
, tx
->key
) ==
556 static ieee80211_txrx_result
557 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data
*tx
)
559 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
562 fc
= le16_to_cpu(hdr
->frame_control
);
564 if (!tx
->key
|| tx
->key
->alg
!= ALG_WEP
||
565 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
566 ((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
567 (fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
568 return TXRX_CONTINUE
;
570 tx
->u
.tx
.control
->iv_len
= WEP_IV_LEN
;
571 tx
->u
.tx
.control
->icv_len
= WEP_ICV_LEN
;
572 ieee80211_tx_set_iswep(tx
);
574 if (wep_encrypt_skb(tx
, tx
->skb
) < 0) {
575 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_wep
);
579 if (tx
->u
.tx
.extra_frag
) {
581 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
582 if (wep_encrypt_skb(tx
, tx
->u
.tx
.extra_frag
[i
]) < 0) {
583 I802_DEBUG_INC(tx
->local
->
584 tx_handlers_drop_wep
);
590 return TXRX_CONTINUE
;
593 static ieee80211_txrx_result
594 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
596 struct rate_control_extra extra
;
598 memset(&extra
, 0, sizeof(extra
));
599 extra
.mode
= tx
->u
.tx
.mode
;
600 extra
.mgmt_data
= tx
->sdata
&&
601 tx
->sdata
->type
== IEEE80211_IF_TYPE_MGMT
;
602 extra
.ethertype
= tx
->ethertype
;
604 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
606 if (unlikely(extra
.probe
!= NULL
)) {
607 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
608 tx
->u
.tx
.probe_last_frag
= 1;
609 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
610 tx
->u
.tx
.rate
= extra
.probe
;
612 tx
->u
.tx
.control
->alt_retry_rate
= -1;
616 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
617 tx
->sdata
->use_protection
&& tx
->fragmented
&&
619 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
620 tx
->u
.tx
.probe_last_frag
= extra
.probe
? 1 : 0;
622 tx
->u
.tx
.rate
= extra
.nonerp
;
623 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
624 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
626 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
627 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
629 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
630 if ((tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
631 tx
->local
->short_preamble
&&
632 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
633 tx
->u
.tx
.short_preamble
= 1;
634 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
637 return TXRX_CONTINUE
;
640 static ieee80211_txrx_result
641 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
643 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
645 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
646 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
648 if (!is_multicast_ether_addr(hdr
->addr1
)) {
649 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
650 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
651 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
652 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
653 control
->retry_limit
=
654 tx
->local
->long_retry_limit
;
656 control
->retry_limit
=
657 tx
->local
->short_retry_limit
;
660 control
->retry_limit
= 1;
663 if (tx
->fragmented
) {
664 /* Do not use multiple retry rates when sending fragmented
666 * TODO: The last fragment could still use multiple retry
668 control
->alt_retry_rate
= -1;
671 /* Use CTS protection for unicast frames sent using extended rates if
672 * there are associated non-ERP stations and RTS/CTS is not configured
674 if (mode
->mode
== MODE_IEEE80211G
&&
675 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
676 tx
->u
.tx
.unicast
&& tx
->sdata
->use_protection
&&
677 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
678 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
680 /* Setup duration field for the first fragment of the frame. Duration
681 * for remaining fragments will be updated when they are being sent
682 * to low-level driver in ieee80211_tx(). */
683 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
684 tx
->fragmented
? tx
->u
.tx
.extra_frag
[0]->len
:
686 hdr
->duration_id
= cpu_to_le16(dur
);
688 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
689 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
690 struct ieee80211_rate
*rate
;
692 /* Do not use multiple retry rates when using RTS/CTS */
693 control
->alt_retry_rate
= -1;
695 /* Use min(data rate, max base rate) as CTS/RTS rate */
696 rate
= tx
->u
.tx
.rate
;
697 while (rate
> mode
->rates
&&
698 !(rate
->flags
& IEEE80211_RATE_BASIC
))
701 control
->rts_cts_rate
= rate
->val
;
702 control
->rts_rate
= rate
;
706 tx
->sta
->tx_packets
++;
707 tx
->sta
->tx_fragments
++;
708 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
709 if (tx
->u
.tx
.extra_frag
) {
711 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
712 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
714 tx
->u
.tx
.extra_frag
[i
]->len
;
719 return TXRX_CONTINUE
;
722 static ieee80211_txrx_result
723 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
725 struct ieee80211_local
*local
= tx
->local
;
726 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
727 struct sk_buff
*skb
= tx
->skb
;
728 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
729 u32 load
= 0, hdrtime
;
731 /* TODO: this could be part of tx_status handling, so that the number
732 * of retries would be known; TX rate should in that case be stored
733 * somewhere with the packet */
735 /* Estimate total channel use caused by this frame */
737 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
738 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
740 if (mode
->mode
== MODE_IEEE80211A
||
741 mode
->mode
== MODE_ATHEROS_TURBO
||
742 mode
->mode
== MODE_ATHEROS_TURBOG
||
743 (mode
->mode
== MODE_IEEE80211G
&&
744 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
745 hdrtime
= CHAN_UTIL_HDR_SHORT
;
747 hdrtime
= CHAN_UTIL_HDR_LONG
;
750 if (!is_multicast_ether_addr(hdr
->addr1
))
753 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
755 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
758 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
760 if (tx
->u
.tx
.extra_frag
) {
762 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
764 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
769 /* Divide channel_use by 8 to avoid wrapping around the counter */
770 load
>>= CHAN_UTIL_SHIFT
;
771 local
->channel_use_raw
+= load
;
773 tx
->sta
->channel_use_raw
+= load
;
774 tx
->sdata
->channel_use_raw
+= load
;
776 return TXRX_CONTINUE
;
779 /* TODO: implement register/unregister functions for adding TX/RX handlers
780 * into ordered list */
782 ieee80211_tx_handler ieee80211_tx_handlers
[] =
784 ieee80211_tx_h_check_assoc
,
785 ieee80211_tx_h_sequence
,
786 ieee80211_tx_h_ps_buf
,
787 ieee80211_tx_h_select_key
,
788 ieee80211_tx_h_michael_mic_add
,
789 ieee80211_tx_h_fragment
,
790 ieee80211_tx_h_tkip_encrypt
,
791 ieee80211_tx_h_ccmp_encrypt
,
792 ieee80211_tx_h_wep_encrypt
,
793 ieee80211_tx_h_rate_ctrl
,
795 ieee80211_tx_h_load_stats
,
799 /* actual transmit path */
802 * deal with packet injection down monitor interface
803 * with Radiotap Header -- only called for monitor mode interface
805 static ieee80211_txrx_result
806 __ieee80211_parse_tx_radiotap(
807 struct ieee80211_txrx_data
*tx
,
808 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
811 * this is the moment to interpret and discard the radiotap header that
812 * must be at the start of the packet injected in Monitor mode
814 * Need to take some care with endian-ness since radiotap
815 * args are little-endian
818 struct ieee80211_radiotap_iterator iterator
;
819 struct ieee80211_radiotap_header
*rthdr
=
820 (struct ieee80211_radiotap_header
*) skb
->data
;
821 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
822 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
825 * default control situation for all injected packets
826 * FIXME: this does not suit all usage cases, expand to allow control
829 control
->retry_limit
= 1; /* no retry */
830 control
->key_idx
= -1; /* no encryption key */
831 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
832 IEEE80211_TXCTL_USE_CTS_PROTECT
);
833 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
834 IEEE80211_TXCTL_NO_ACK
;
835 control
->antenna_sel_tx
= 0; /* default to default antenna */
838 * for every radiotap entry that is present
839 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
840 * entries present, or -EINVAL on error)
846 ret
= ieee80211_radiotap_iterator_next(&iterator
);
851 /* see if this argument is something we can use */
852 switch (iterator
.this_arg_index
) {
854 * You must take care when dereferencing iterator.this_arg
855 * for multibyte types... the pointer is not aligned. Use
856 * get_unaligned((type *)iterator.this_arg) to dereference
857 * iterator.this_arg for type "type" safely on all arches.
859 case IEEE80211_RADIOTAP_RATE
:
861 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
862 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
864 target_rate
= (*iterator
.this_arg
) * 5;
865 for (i
= 0; i
< mode
->num_rates
; i
++) {
866 struct ieee80211_rate
*r
= &mode
->rates
[i
];
868 if (r
->rate
> target_rate
)
873 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
874 control
->tx_rate
= r
->val2
;
876 control
->tx_rate
= r
->val
;
878 /* end on exact match */
879 if (r
->rate
== target_rate
)
884 case IEEE80211_RADIOTAP_ANTENNA
:
886 * radiotap uses 0 for 1st ant, mac80211 is 1 for
889 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
892 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
893 control
->power_level
= *iterator
.this_arg
;
896 case IEEE80211_RADIOTAP_FLAGS
:
897 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
899 * this indicates that the skb we have been
900 * handed has the 32-bit FCS CRC at the end...
901 * we should react to that by snipping it off
902 * because it will be recomputed and added
905 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
908 skb_trim(skb
, skb
->len
- FCS_LEN
);
917 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
921 * remove the radiotap header
922 * iterator->max_length was sanity-checked against
923 * skb->len by iterator init
925 skb_pull(skb
, iterator
.max_length
);
927 return TXRX_CONTINUE
;
930 static ieee80211_txrx_result
inline
931 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
933 struct net_device
*dev
,
934 struct ieee80211_tx_control
*control
)
936 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
937 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
938 struct ieee80211_sub_if_data
*sdata
;
939 ieee80211_txrx_result res
= TXRX_CONTINUE
;
943 memset(tx
, 0, sizeof(*tx
));
945 tx
->dev
= dev
; /* use original interface */
947 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
948 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
949 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
952 * set defaults for things that can be set by
953 * injected radiotap headers
955 control
->power_level
= local
->hw
.conf
.power_level
;
956 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
957 if (local
->sta_antenna_sel
!= STA_ANTENNA_SEL_AUTO
&& tx
->sta
)
958 control
->antenna_sel_tx
= tx
->sta
->antenna_sel_tx
;
960 /* process and remove the injection radiotap header */
961 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
962 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
963 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
968 * we removed the radiotap header after this point,
969 * we filled control with what we could use
970 * set to the actual ieee header now
972 hdr
= (struct ieee80211_hdr
*) skb
->data
;
973 res
= TXRX_QUEUED
; /* indication it was monitor packet */
976 tx
->u
.tx
.control
= control
;
977 tx
->u
.tx
.unicast
= !is_multicast_ether_addr(hdr
->addr1
);
978 if (is_multicast_ether_addr(hdr
->addr1
))
979 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
981 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
982 tx
->fragmented
= local
->fragmentation_threshold
<
983 IEEE80211_MAX_FRAG_THRESHOLD
&& tx
->u
.tx
.unicast
&&
984 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
985 (!local
->ops
->set_frag_threshold
);
987 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
988 else if (tx
->sta
->clear_dst_mask
) {
989 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
990 tx
->sta
->clear_dst_mask
= 0;
992 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
993 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
994 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
995 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
997 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1002 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1003 * finished with it. */
1004 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1005 struct sk_buff
*skb
,
1006 struct net_device
*mdev
,
1007 struct ieee80211_tx_control
*control
)
1009 struct ieee80211_tx_packet_data
*pkt_data
;
1010 struct net_device
*dev
;
1012 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1013 dev
= dev_get_by_index(pkt_data
->ifindex
);
1014 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1020 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1024 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1025 struct ieee80211_txrx_data
*tx
)
1027 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1030 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1031 __ieee80211_queue_stopped(local
, 0)) {
1032 netif_stop_queue(local
->mdev
);
1033 return IEEE80211_TX_AGAIN
;
1036 ieee80211_dump_frame(local
->mdev
->name
, "TX to low-level driver", skb
);
1037 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1039 return IEEE80211_TX_AGAIN
;
1040 local
->mdev
->trans_start
= jiffies
;
1041 ieee80211_led_tx(local
, 1);
1043 if (tx
->u
.tx
.extra_frag
) {
1044 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1045 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1046 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1047 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1048 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1049 if (!tx
->u
.tx
.extra_frag
[i
])
1051 if (__ieee80211_queue_stopped(local
, control
->queue
))
1052 return IEEE80211_TX_FRAG_AGAIN
;
1053 if (i
== tx
->u
.tx
.num_extra_frag
) {
1054 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1055 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1056 if (tx
->u
.tx
.probe_last_frag
)
1058 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1061 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1064 ieee80211_dump_frame(local
->mdev
->name
,
1065 "TX to low-level driver",
1066 tx
->u
.tx
.extra_frag
[i
]);
1067 ret
= local
->ops
->tx(local_to_hw(local
),
1068 tx
->u
.tx
.extra_frag
[i
],
1071 return IEEE80211_TX_FRAG_AGAIN
;
1072 local
->mdev
->trans_start
= jiffies
;
1073 ieee80211_led_tx(local
, 1);
1074 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1076 kfree(tx
->u
.tx
.extra_frag
);
1077 tx
->u
.tx
.extra_frag
= NULL
;
1079 return IEEE80211_TX_OK
;
1082 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1083 struct ieee80211_tx_control
*control
, int mgmt
)
1085 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1086 struct sta_info
*sta
;
1087 ieee80211_tx_handler
*handler
;
1088 struct ieee80211_txrx_data tx
;
1089 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1092 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1094 if (unlikely(skb
->len
< 10)) {
1099 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1101 if (res_prepare
== TXRX_DROP
) {
1107 tx
.u
.tx
.mgmt_interface
= mgmt
;
1108 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1110 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1111 res
= TXRX_CONTINUE
;
1113 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1115 res
= (*handler
)(&tx
);
1116 if (res
!= TXRX_CONTINUE
)
1121 skb
= tx
.skb
; /* handlers are allowed to change skb */
1126 if (unlikely(res
== TXRX_DROP
)) {
1127 I802_DEBUG_INC(local
->tx_handlers_drop
);
1131 if (unlikely(res
== TXRX_QUEUED
)) {
1132 I802_DEBUG_INC(local
->tx_handlers_queued
);
1136 if (tx
.u
.tx
.extra_frag
) {
1137 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1139 struct ieee80211_hdr
*hdr
=
1140 (struct ieee80211_hdr
*)
1141 tx
.u
.tx
.extra_frag
[i
]->data
;
1143 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1144 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1147 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1148 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1150 dur
= ieee80211_duration(&tx
, 0, next_len
);
1151 hdr
->duration_id
= cpu_to_le16(dur
);
1156 ret
= __ieee80211_tx(local
, skb
, &tx
);
1158 struct ieee80211_tx_stored_packet
*store
=
1159 &local
->pending_packet
[control
->queue
];
1161 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1163 set_bit(IEEE80211_LINK_STATE_PENDING
,
1164 &local
->state
[control
->queue
]);
1166 /* When the driver gets out of buffers during sending of
1167 * fragments and calls ieee80211_stop_queue, there is
1168 * a small window between IEEE80211_LINK_STATE_XOFF and
1169 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1170 * gets available in that window (i.e. driver calls
1171 * ieee80211_wake_queue), we would end up with ieee80211_tx
1172 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1173 * continuing transmitting here when that situation is
1174 * possible to have happened. */
1175 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1176 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1177 &local
->state
[control
->queue
]);
1180 memcpy(&store
->control
, control
,
1181 sizeof(struct ieee80211_tx_control
));
1183 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1184 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1185 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1186 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1187 store
->last_frag_rate_ctrl_probe
= tx
.u
.tx
.probe_last_frag
;
1194 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1195 if (tx
.u
.tx
.extra_frag
[i
])
1196 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1197 kfree(tx
.u
.tx
.extra_frag
);
1201 /* device xmit handlers */
1203 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1204 struct net_device
*dev
)
1206 struct ieee80211_tx_control control
;
1207 struct ieee80211_tx_packet_data
*pkt_data
;
1208 struct net_device
*odev
= NULL
;
1209 struct ieee80211_sub_if_data
*osdata
;
1214 * copy control out of the skb so other people can use skb->cb
1216 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1217 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1219 if (pkt_data
->ifindex
)
1220 odev
= dev_get_by_index(pkt_data
->ifindex
);
1221 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1225 if (unlikely(!odev
)) {
1226 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1227 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1228 "originating device\n", dev
->name
);
1233 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1235 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1236 if (skb_headroom(skb
) < headroom
) {
1237 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1244 control
.ifindex
= odev
->ifindex
;
1245 control
.type
= osdata
->type
;
1246 if (pkt_data
->req_tx_status
)
1247 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1248 if (pkt_data
->do_not_encrypt
)
1249 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1250 if (pkt_data
->requeue
)
1251 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1252 control
.queue
= pkt_data
->queue
;
1254 ret
= ieee80211_tx(odev
, skb
, &control
,
1255 control
.type
== IEEE80211_IF_TYPE_MGMT
);
1261 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1262 struct net_device
*dev
)
1264 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1265 struct ieee80211_tx_packet_data
*pkt_data
;
1266 struct ieee80211_radiotap_header
*prthdr
=
1267 (struct ieee80211_radiotap_header
*)skb
->data
;
1271 * there must be a radiotap header at the
1272 * start in this case
1274 if (unlikely(prthdr
->it_version
)) {
1275 /* only version 0 is supported */
1277 return NETDEV_TX_OK
;
1280 skb
->dev
= local
->mdev
;
1282 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1283 memset(pkt_data
, 0, sizeof(*pkt_data
));
1284 pkt_data
->ifindex
= dev
->ifindex
;
1285 pkt_data
->mgmt_iface
= 0;
1286 pkt_data
->do_not_encrypt
= 1;
1288 /* above needed because we set skb device to master */
1291 * fix up the pointers accounting for the radiotap
1292 * header still being in there. We are being given
1293 * a precooked IEEE80211 header so no need for
1296 len
= le16_to_cpu(get_unaligned(&prthdr
->it_len
));
1297 skb_set_mac_header(skb
, len
);
1298 skb_set_network_header(skb
, len
+ sizeof(struct ieee80211_hdr
));
1299 skb_set_transport_header(skb
, len
+ sizeof(struct ieee80211_hdr
));
1302 * pass the radiotap header up to
1303 * the next stage intact
1305 dev_queue_xmit(skb
);
1307 return NETDEV_TX_OK
;
1311 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1312 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1313 * @skb: packet to be sent
1314 * @dev: incoming interface
1316 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1317 * not be freed, and caller is responsible for either retrying later or freeing
1320 * This function takes in an Ethernet header and encapsulates it with suitable
1321 * IEEE 802.11 header based on which interface the packet is coming in. The
1322 * encapsulated packet will then be passed to master interface, wlan#.11, for
1323 * transmission (through low-level driver).
1325 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1326 struct net_device
*dev
)
1328 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1329 struct ieee80211_tx_packet_data
*pkt_data
;
1330 struct ieee80211_sub_if_data
*sdata
;
1331 int ret
= 1, head_need
;
1332 u16 ethertype
, hdrlen
, fc
;
1333 struct ieee80211_hdr hdr
;
1334 const u8
*encaps_data
;
1335 int encaps_len
, skip_header_bytes
;
1336 int nh_pos
, h_pos
, no_encrypt
= 0;
1337 struct sta_info
*sta
;
1339 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1340 if (unlikely(skb
->len
< ETH_HLEN
)) {
1341 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1342 dev
->name
, skb
->len
);
1347 nh_pos
= skb_network_header(skb
) - skb
->data
;
1348 h_pos
= skb_transport_header(skb
) - skb
->data
;
1350 /* convert Ethernet header to proper 802.11 header (based on
1351 * operation mode) */
1352 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1353 /* TODO: handling for 802.1x authorized/unauthorized port */
1354 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1356 if (likely(sdata
->type
== IEEE80211_IF_TYPE_AP
||
1357 sdata
->type
== IEEE80211_IF_TYPE_VLAN
)) {
1358 fc
|= IEEE80211_FCTL_FROMDS
;
1360 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1361 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1362 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1364 } else if (sdata
->type
== IEEE80211_IF_TYPE_WDS
) {
1365 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1367 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1368 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1369 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1370 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1372 } else if (sdata
->type
== IEEE80211_IF_TYPE_STA
) {
1373 fc
|= IEEE80211_FCTL_TODS
;
1375 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1376 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1377 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1379 } else if (sdata
->type
== IEEE80211_IF_TYPE_IBSS
) {
1381 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1382 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1383 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1390 /* receiver is QoS enabled, use a QoS type frame */
1391 sta
= sta_info_get(local
, hdr
.addr1
);
1393 if (sta
->flags
& WLAN_STA_WME
) {
1394 fc
|= IEEE80211_STYPE_QOS_DATA
;
1400 hdr
.frame_control
= cpu_to_le16(fc
);
1401 hdr
.duration_id
= 0;
1404 skip_header_bytes
= ETH_HLEN
;
1405 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1406 encaps_data
= bridge_tunnel_header
;
1407 encaps_len
= sizeof(bridge_tunnel_header
);
1408 skip_header_bytes
-= 2;
1409 } else if (ethertype
>= 0x600) {
1410 encaps_data
= rfc1042_header
;
1411 encaps_len
= sizeof(rfc1042_header
);
1412 skip_header_bytes
-= 2;
1418 skb_pull(skb
, skip_header_bytes
);
1419 nh_pos
-= skip_header_bytes
;
1420 h_pos
-= skip_header_bytes
;
1422 /* TODO: implement support for fragments so that there is no need to
1423 * reallocate and copy payload; it might be enough to support one
1424 * extra fragment that would be copied in the beginning of the frame
1425 * data.. anyway, it would be nice to include this into skb structure
1428 * There are few options for this:
1429 * use skb->cb as an extra space for 802.11 header
1430 * allocate new buffer if not enough headroom
1431 * make sure that there is enough headroom in every skb by increasing
1432 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1433 * alloc_skb() (net/core/skbuff.c)
1435 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1436 head_need
-= skb_headroom(skb
);
1438 /* We are going to modify skb data, so make a copy of it if happens to
1439 * be cloned. This could happen, e.g., with Linux bridge code passing
1440 * us broadcast frames. */
1442 if (head_need
> 0 || skb_cloned(skb
)) {
1444 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1445 "of headroom\n", dev
->name
, head_need
);
1448 if (skb_cloned(skb
))
1449 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1451 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1452 /* Since we have to reallocate the buffer, make sure that there
1453 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1454 * before payload and 12 after). */
1455 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1457 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1464 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1465 nh_pos
+= encaps_len
;
1466 h_pos
+= encaps_len
;
1468 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1472 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1473 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1474 pkt_data
->ifindex
= dev
->ifindex
;
1475 pkt_data
->mgmt_iface
= (sdata
->type
== IEEE80211_IF_TYPE_MGMT
);
1476 pkt_data
->do_not_encrypt
= no_encrypt
;
1478 skb
->dev
= local
->mdev
;
1479 sdata
->stats
.tx_packets
++;
1480 sdata
->stats
.tx_bytes
+= skb
->len
;
1482 /* Update skb pointers to various headers since this modified frame
1483 * is going to go through Linux networking code that may potentially
1484 * need things like pointer to IP header. */
1485 skb_set_mac_header(skb
, 0);
1486 skb_set_network_header(skb
, nh_pos
);
1487 skb_set_transport_header(skb
, h_pos
);
1489 dev
->trans_start
= jiffies
;
1490 dev_queue_xmit(skb
);
1502 * This is the transmit routine for the 802.11 type interfaces
1503 * called by upper layers of the linux networking
1504 * stack when it has a frame to transmit
1506 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1508 struct ieee80211_sub_if_data
*sdata
;
1509 struct ieee80211_tx_packet_data
*pkt_data
;
1510 struct ieee80211_hdr
*hdr
;
1513 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1515 if (skb
->len
< 10) {
1520 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1521 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1528 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1529 fc
= le16_to_cpu(hdr
->frame_control
);
1531 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1532 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1533 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1534 pkt_data
->mgmt_iface
= (sdata
->type
== IEEE80211_IF_TYPE_MGMT
);
1536 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1537 skb
->dev
= sdata
->local
->mdev
;
1540 * We're using the protocol field of the the frame control header
1541 * to request TX callback for hostapd. BIT(1) is checked.
1543 if ((fc
& BIT(1)) == BIT(1)) {
1544 pkt_data
->req_tx_status
= 1;
1546 hdr
->frame_control
= cpu_to_le16(fc
);
1549 pkt_data
->do_not_encrypt
= !(fc
& IEEE80211_FCTL_PROTECTED
);
1551 sdata
->stats
.tx_packets
++;
1552 sdata
->stats
.tx_bytes
+= skb
->len
;
1554 dev_queue_xmit(skb
);
1559 /* helper functions for pending packets for when queues are stopped */
1561 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1564 struct ieee80211_tx_stored_packet
*store
;
1566 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1567 if (!__ieee80211_queue_pending(local
, i
))
1569 store
= &local
->pending_packet
[i
];
1570 kfree_skb(store
->skb
);
1571 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1572 kfree_skb(store
->extra_frag
[j
]);
1573 kfree(store
->extra_frag
);
1574 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1578 void ieee80211_tx_pending(unsigned long data
)
1580 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1581 struct net_device
*dev
= local
->mdev
;
1582 struct ieee80211_tx_stored_packet
*store
;
1583 struct ieee80211_txrx_data tx
;
1584 int i
, ret
, reschedule
= 0;
1586 netif_tx_lock_bh(dev
);
1587 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1588 if (__ieee80211_queue_stopped(local
, i
))
1590 if (!__ieee80211_queue_pending(local
, i
)) {
1594 store
= &local
->pending_packet
[i
];
1595 tx
.u
.tx
.control
= &store
->control
;
1596 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1597 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1598 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1599 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1600 tx
.u
.tx
.probe_last_frag
= store
->last_frag_rate_ctrl_probe
;
1601 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1603 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1606 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1611 netif_tx_unlock_bh(dev
);
1613 if (!ieee80211_qdisc_installed(dev
)) {
1614 if (!__ieee80211_queue_stopped(local
, 0))
1615 netif_wake_queue(dev
);
1617 netif_schedule(dev
);
1621 /* functions for drivers to get certain frames */
1623 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1624 struct ieee80211_if_ap
*bss
,
1625 struct sk_buff
*skb
)
1629 int i
, have_bits
= 0, n1
, n2
;
1631 /* Generate bitmap for TIM only if there are any STAs in power save
1633 read_lock_bh(&local
->sta_lock
);
1634 if (atomic_read(&bss
->num_sta_ps
) > 0)
1635 /* in the hope that this is faster than
1636 * checking byte-for-byte */
1637 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1638 IEEE80211_MAX_AID
+1);
1640 if (bss
->dtim_count
== 0)
1641 bss
->dtim_count
= bss
->dtim_period
- 1;
1645 tim
= pos
= (u8
*) skb_put(skb
, 6);
1646 *pos
++ = WLAN_EID_TIM
;
1648 *pos
++ = bss
->dtim_count
;
1649 *pos
++ = bss
->dtim_period
;
1651 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1655 /* Find largest even number N1 so that bits numbered 1 through
1656 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1657 * (N2 + 1) x 8 through 2007 are 0. */
1659 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1666 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1673 /* Bitmap control */
1675 /* Part Virt Bitmap */
1676 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1678 tim
[1] = n2
- n1
+ 4;
1679 skb_put(skb
, n2
- n1
);
1681 *pos
++ = aid0
; /* Bitmap control */
1682 *pos
++ = 0; /* Part Virt Bitmap */
1684 read_unlock_bh(&local
->sta_lock
);
1687 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1688 struct ieee80211_tx_control
*control
)
1690 struct ieee80211_local
*local
= hw_to_local(hw
);
1691 struct sk_buff
*skb
;
1692 struct net_device
*bdev
;
1693 struct ieee80211_sub_if_data
*sdata
= NULL
;
1694 struct ieee80211_if_ap
*ap
= NULL
;
1695 struct ieee80211_rate
*rate
;
1696 struct rate_control_extra extra
;
1697 u8
*b_head
, *b_tail
;
1700 bdev
= dev_get_by_index(if_id
);
1702 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1707 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1709 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1710 if (net_ratelimit())
1711 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1712 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1713 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1717 /* Assume we are generating the normal beacon locally */
1718 b_head
= ap
->beacon_head
;
1719 b_tail
= ap
->beacon_tail
;
1720 bh_len
= ap
->beacon_head_len
;
1721 bt_len
= ap
->beacon_tail_len
;
1723 skb
= dev_alloc_skb(local
->tx_headroom
+
1724 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1728 skb_reserve(skb
, local
->tx_headroom
);
1729 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1731 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1733 ieee80211_beacon_add_tim(local
, ap
, skb
);
1736 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1740 memset(&extra
, 0, sizeof(extra
));
1741 extra
.mode
= local
->oper_hw_mode
;
1743 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1745 if (net_ratelimit()) {
1746 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1747 "found\n", local
->mdev
->name
);
1753 control
->tx_rate
= (local
->short_preamble
&&
1754 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1755 rate
->val2
: rate
->val
;
1756 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1757 control
->power_level
= local
->hw
.conf
.power_level
;
1758 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1759 control
->retry_limit
= 1;
1760 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1766 EXPORT_SYMBOL(ieee80211_beacon_get
);
1768 void ieee80211_rts_get(struct ieee80211_hw
*hw
,
1769 const void *frame
, size_t frame_len
,
1770 const struct ieee80211_tx_control
*frame_txctl
,
1771 struct ieee80211_rts
*rts
)
1773 const struct ieee80211_hdr
*hdr
= frame
;
1776 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1777 rts
->frame_control
= cpu_to_le16(fctl
);
1778 rts
->duration
= ieee80211_rts_duration(hw
, frame_len
, frame_txctl
);
1779 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1780 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1782 EXPORT_SYMBOL(ieee80211_rts_get
);
1784 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
,
1785 const void *frame
, size_t frame_len
,
1786 const struct ieee80211_tx_control
*frame_txctl
,
1787 struct ieee80211_cts
*cts
)
1789 const struct ieee80211_hdr
*hdr
= frame
;
1792 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1793 cts
->frame_control
= cpu_to_le16(fctl
);
1794 cts
->duration
= ieee80211_ctstoself_duration(hw
, frame_len
, frame_txctl
);
1795 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1797 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1800 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1801 struct ieee80211_tx_control
*control
)
1803 struct ieee80211_local
*local
= hw_to_local(hw
);
1804 struct sk_buff
*skb
;
1805 struct sta_info
*sta
;
1806 ieee80211_tx_handler
*handler
;
1807 struct ieee80211_txrx_data tx
;
1808 ieee80211_txrx_result res
= TXRX_DROP
;
1809 struct net_device
*bdev
;
1810 struct ieee80211_sub_if_data
*sdata
;
1811 struct ieee80211_if_ap
*bss
= NULL
;
1813 bdev
= dev_get_by_index(if_id
);
1815 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1819 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1822 if (bss
->dtim_count
!= 0)
1823 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1824 memset(control
, 0, sizeof(*control
));
1826 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1829 local
->total_ps_buffered
--;
1831 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1832 struct ieee80211_hdr
*hdr
=
1833 (struct ieee80211_hdr
*) skb
->data
;
1834 /* more buffered multicast/broadcast frames ==> set
1835 * MoreData flag in IEEE 802.11 header to inform PS
1837 hdr
->frame_control
|=
1838 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1841 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1843 dev_kfree_skb_any(skb
);
1846 tx
.u
.tx
.ps_buffered
= 1;
1848 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1849 res
= (*handler
)(&tx
);
1850 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1854 skb
= tx
.skb
; /* handlers are allowed to change skb */
1856 if (res
== TXRX_DROP
) {
1857 I802_DEBUG_INC(local
->tx_handlers_drop
);
1860 } else if (res
== TXRX_QUEUED
) {
1861 I802_DEBUG_INC(local
->tx_handlers_queued
);
1870 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);