2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "ieee80211_led.h"
32 #include "ieee80211_rate.h"
34 #define IEEE80211_TX_OK 0
35 #define IEEE80211_TX_AGAIN 1
36 #define IEEE80211_TX_FRAG_AGAIN 2
40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
41 struct ieee80211_hdr
*hdr
)
43 /* Set the sequence number for this frame. */
44 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
46 /* Increase the sequence number. */
47 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
51 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
52 const struct sk_buff
*skb
)
54 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
59 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
65 fc
= le16_to_cpu(hdr
->frame_control
);
66 hdrlen
= ieee80211_get_hdrlen(fc
);
67 if (hdrlen
> skb
->len
)
70 printk(" FC=0x%04x DUR=0x%04x",
71 fc
, le16_to_cpu(hdr
->duration_id
));
73 printk(" A1=%s", print_mac(mac
, hdr
->addr1
));
75 printk(" A2=%s", print_mac(mac
, hdr
->addr2
));
77 printk(" A3=%s", print_mac(mac
, hdr
->addr3
));
79 printk(" A4=%s", print_mac(mac
, hdr
->addr4
));
82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
83 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
89 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
92 int rate
, mrate
, erp
, dur
, i
;
93 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
94 struct ieee80211_local
*local
= tx
->local
;
95 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
97 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
100 * data and mgmt (except PS Poll):
101 * - during CFP: 32768
102 * - during contention period:
103 * if addr1 is group address: 0
104 * if more fragments = 0 and addr1 is individual address: time to
105 * transmit one ACK plus SIFS
106 * if more fragments = 1 and addr1 is individual address: time to
107 * transmit next fragment plus 2 x ACK plus 3 x SIFS
110 * - control response frame (CTS or ACK) shall be transmitted using the
111 * same rate as the immediately previous frame in the frame exchange
112 * sequence, if this rate belongs to the PHY mandatory rates, or else
113 * at the highest possible rate belonging to the PHY rates in the
117 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
118 /* TODO: These control frames are not currently sent by
119 * 80211.o, but should they be implemented, this function
120 * needs to be updated to support duration field calculation.
122 * RTS: time needed to transmit pending data/mgmt frame plus
123 * one CTS frame plus one ACK frame plus 3 x SIFS
124 * CTS: duration of immediately previous RTS minus time
125 * required to transmit CTS and its SIFS
126 * ACK: 0 if immediately previous directed data/mgmt had
127 * more=0, with more=1 duration in ACK frame is duration
128 * from previous frame minus time needed to transmit ACK
130 * PS Poll: BIT(15) | BIT(14) | aid
136 if (0 /* FIX: data/mgmt during CFP */)
139 if (group_addr
) /* Group address as the destination - no ACK */
142 /* Individual destination address:
143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
144 * CTS and ACK frames shall be transmitted using the highest rate in
145 * basic rate set that is less than or equal to the rate of the
146 * immediately previous frame and that is using the same modulation
147 * (CCK or OFDM). If no basic rate set matches with these requirements,
148 * the highest mandatory rate of the PHY that is less than or equal to
149 * the rate of the previous frame is used.
150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
153 mrate
= 10; /* use 1 Mbps if everything fails */
154 for (i
= 0; i
< mode
->num_rates
; i
++) {
155 struct ieee80211_rate
*r
= &mode
->rates
[i
];
156 if (r
->rate
> txrate
->rate
)
159 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
160 IEEE80211_RATE_MODULATION(r
->flags
))
163 if (r
->flags
& IEEE80211_RATE_BASIC
)
165 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
169 /* No matching basic rate found; use highest suitable mandatory
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
178 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
179 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur
*= 2; /* ACK + SIFS */
186 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
189 IEEE80211_SDATA_SHORT_PREAMBLE
);
195 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
198 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
201 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
204 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
207 static int inline is_ieee80211_device(struct net_device
*dev
,
208 struct net_device
*master
)
210 return (wdev_priv(dev
->ieee80211_ptr
) ==
211 wdev_priv(master
->ieee80211_ptr
));
216 static ieee80211_txrx_result
217 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
219 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
220 struct sk_buff
*skb
= tx
->skb
;
221 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
222 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
225 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
))
226 return TXRX_CONTINUE
;
228 if (unlikely(tx
->local
->sta_sw_scanning
) &&
229 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
230 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
233 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
234 return TXRX_CONTINUE
;
236 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
238 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
239 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
240 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
241 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243 DECLARE_MAC_BUF(mac
);
244 printk(KERN_DEBUG
"%s: dropped data frame to not "
245 "associated station %s\n",
246 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
247 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
248 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
252 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
253 tx
->local
->num_sta
== 0 &&
254 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
)) {
256 * No associated STAs - no need to send multicast
261 return TXRX_CONTINUE
;
264 return TXRX_CONTINUE
;
267 static ieee80211_txrx_result
268 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
270 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
272 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
273 ieee80211_include_sequence(tx
->sdata
, hdr
);
275 return TXRX_CONTINUE
;
278 /* This function is called whenever the AP is about to exceed the maximum limit
279 * of buffered frames for power saving STAs. This situation should not really
280 * happen often during normal operation, so dropping the oldest buffered packet
281 * from each queue should be OK to make some room for new frames. */
282 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
284 int total
= 0, purged
= 0;
286 struct ieee80211_sub_if_data
*sdata
;
287 struct sta_info
*sta
;
290 * virtual interfaces are protected by RCU
294 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
295 struct ieee80211_if_ap
*ap
;
296 if (sdata
->dev
== local
->mdev
||
297 sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
)
300 skb
= skb_dequeue(&ap
->ps_bc_buf
);
305 total
+= skb_queue_len(&ap
->ps_bc_buf
);
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 wiphy_name(local
->hw
.wiphy
), purged
);
325 static ieee80211_txrx_result
326 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
329 * broadcast/multicast frame
331 * If any of the associated stations is in power save mode,
332 * the frame is buffered to be sent after DTIM beacon frame.
333 * This is done either by the hardware or us.
336 /* not AP/IBSS or ordered frame */
337 if (!tx
->sdata
->bss
|| (tx
->fc
& IEEE80211_FCTL_ORDER
))
338 return TXRX_CONTINUE
;
340 /* no stations in PS mode */
341 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
342 return TXRX_CONTINUE
;
344 /* buffered in mac80211 */
345 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
346 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
347 purge_old_ps_buffers(tx
->local
);
348 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
350 if (net_ratelimit()) {
351 printk(KERN_DEBUG
"%s: BC TX buffer full - "
352 "dropping the oldest frame\n",
355 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
357 tx
->local
->total_ps_buffered
++;
358 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
362 /* buffered in hardware */
363 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_SEND_AFTER_DTIM
;
365 return TXRX_CONTINUE
;
368 static ieee80211_txrx_result
369 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
371 struct sta_info
*sta
= tx
->sta
;
372 DECLARE_MAC_BUF(mac
);
375 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
376 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
377 return TXRX_CONTINUE
;
379 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
380 struct ieee80211_tx_packet_data
*pkt_data
;
381 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
382 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
384 print_mac(mac
, sta
->addr
), sta
->aid
,
385 skb_queue_len(&sta
->ps_tx_buf
));
386 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
387 sta
->flags
|= WLAN_STA_TIM
;
388 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
389 purge_old_ps_buffers(tx
->local
);
390 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
391 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
392 if (net_ratelimit()) {
393 printk(KERN_DEBUG
"%s: STA %s TX "
394 "buffer full - dropping oldest frame\n",
395 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
399 tx
->local
->total_ps_buffered
++;
400 /* Queue frame to be sent after STA sends an PS Poll frame */
401 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
402 if (tx
->local
->ops
->set_tim
)
403 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
406 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
408 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
409 pkt_data
->jiffies
= jiffies
;
410 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
413 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
414 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
415 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
416 "set -> send frame\n", tx
->dev
->name
,
417 print_mac(mac
, sta
->addr
));
419 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
422 return TXRX_CONTINUE
;
425 static ieee80211_txrx_result
426 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
428 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
429 return TXRX_CONTINUE
;
431 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
432 return ieee80211_tx_h_unicast_ps_buf(tx
);
434 return ieee80211_tx_h_multicast_ps_buf(tx
);
437 static ieee80211_txrx_result
438 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
440 struct ieee80211_key
*key
;
443 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
445 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
447 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
449 else if (tx
->sdata
->drop_unencrypted
&&
450 !(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_EAPOL_FRAME
) &&
451 !(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
)) {
452 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
460 tx
->key
->tx_rx_count
++;
461 /* TODO: add threshold stuff again */
463 switch (tx
->key
->conf
.alg
) {
465 ftype
= fc
& IEEE80211_FCTL_FTYPE
;
466 stype
= fc
& IEEE80211_FCTL_STYPE
;
468 if (ftype
== IEEE80211_FTYPE_MGMT
&&
469 stype
== IEEE80211_STYPE_AUTH
)
473 if (!WLAN_FC_DATA_PRESENT(fc
))
479 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
480 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
482 return TXRX_CONTINUE
;
485 static ieee80211_txrx_result
486 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
488 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
489 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
490 struct sk_buff
**frags
, *first
, *frag
;
494 int frag_threshold
= tx
->local
->fragmentation_threshold
;
496 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
497 return TXRX_CONTINUE
;
501 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
502 payload_len
= first
->len
- hdrlen
;
503 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
504 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
506 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
510 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
511 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
512 pos
= first
->data
+ hdrlen
+ per_fragm
;
513 left
= payload_len
- per_fragm
;
514 for (i
= 0; i
< num_fragm
- 1; i
++) {
515 struct ieee80211_hdr
*fhdr
;
521 /* reserve enough extra head and tail room for possible
524 dev_alloc_skb(tx
->local
->tx_headroom
+
526 IEEE80211_ENCRYPT_HEADROOM
+
527 IEEE80211_ENCRYPT_TAILROOM
);
530 /* Make sure that all fragments use the same priority so
531 * that they end up using the same TX queue */
532 frag
->priority
= first
->priority
;
533 skb_reserve(frag
, tx
->local
->tx_headroom
+
534 IEEE80211_ENCRYPT_HEADROOM
);
535 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
536 memcpy(fhdr
, first
->data
, hdrlen
);
537 if (i
== num_fragm
- 2)
538 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
539 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
540 copylen
= left
> per_fragm
? per_fragm
: left
;
541 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
546 skb_trim(first
, hdrlen
+ per_fragm
);
548 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
549 tx
->u
.tx
.extra_frag
= frags
;
551 return TXRX_CONTINUE
;
554 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
556 for (i
= 0; i
< num_fragm
- 1; i
++)
558 dev_kfree_skb(frags
[i
]);
561 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
565 static ieee80211_txrx_result
566 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data
*tx
)
569 return TXRX_CONTINUE
;
571 switch (tx
->key
->conf
.alg
) {
573 return ieee80211_crypto_wep_encrypt(tx
);
575 return ieee80211_crypto_tkip_encrypt(tx
);
577 return ieee80211_crypto_ccmp_encrypt(tx
);
585 static ieee80211_txrx_result
586 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
588 struct rate_selection rsel
;
590 if (likely(!tx
->u
.tx
.rate
)) {
591 rate_control_get_rate(tx
->dev
, tx
->u
.tx
.mode
, tx
->skb
, &rsel
);
592 tx
->u
.tx
.rate
= rsel
.rate
;
593 if (unlikely(rsel
.probe
!= NULL
)) {
594 tx
->u
.tx
.control
->flags
|=
595 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
596 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
597 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
598 tx
->u
.tx
.rate
= rsel
.probe
;
600 tx
->u
.tx
.control
->alt_retry_rate
= -1;
605 tx
->u
.tx
.control
->alt_retry_rate
= -1;
607 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
608 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
609 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && rsel
.nonerp
) {
610 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
612 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
614 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
615 tx
->u
.tx
.rate
= rsel
.nonerp
;
616 tx
->u
.tx
.control
->rate
= rsel
.nonerp
;
617 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
619 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
620 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
622 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
624 return TXRX_CONTINUE
;
627 static ieee80211_txrx_result
628 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
630 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
631 u16 fc
= le16_to_cpu(hdr
->frame_control
);
633 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
634 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
636 if (!control
->retry_limit
) {
637 if (!is_multicast_ether_addr(hdr
->addr1
)) {
638 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
639 && tx
->local
->rts_threshold
<
640 IEEE80211_MAX_RTS_THRESHOLD
) {
642 IEEE80211_TXCTL_USE_RTS_CTS
;
644 IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
645 control
->retry_limit
=
646 tx
->local
->long_retry_limit
;
648 control
->retry_limit
=
649 tx
->local
->short_retry_limit
;
652 control
->retry_limit
= 1;
656 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
657 /* Do not use multiple retry rates when sending fragmented
659 * TODO: The last fragment could still use multiple retry
661 control
->alt_retry_rate
= -1;
664 /* Use CTS protection for unicast frames sent using extended rates if
665 * there are associated non-ERP stations and RTS/CTS is not configured
667 if (mode
->mode
== MODE_IEEE80211G
&&
668 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
669 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
670 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
671 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
672 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
674 /* Transmit data frames using short preambles if the driver supports
675 * short preambles at the selected rate and short preambles are
676 * available on the network at the current point in time. */
677 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
678 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
679 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
680 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
681 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
684 /* Setup duration field for the first fragment of the frame. Duration
685 * for remaining fragments will be updated when they are being sent
686 * to low-level driver in ieee80211_tx(). */
687 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
688 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
689 tx
->u
.tx
.extra_frag
[0]->len
: 0);
690 hdr
->duration_id
= cpu_to_le16(dur
);
692 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
693 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
694 struct ieee80211_rate
*rate
;
696 /* Do not use multiple retry rates when using RTS/CTS */
697 control
->alt_retry_rate
= -1;
699 /* Use min(data rate, max base rate) as CTS/RTS rate */
700 rate
= tx
->u
.tx
.rate
;
701 while (rate
> mode
->rates
&&
702 !(rate
->flags
& IEEE80211_RATE_BASIC
))
705 control
->rts_cts_rate
= rate
->val
;
706 control
->rts_rate
= rate
;
710 tx
->sta
->tx_packets
++;
711 tx
->sta
->tx_fragments
++;
712 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
713 if (tx
->u
.tx
.extra_frag
) {
715 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
716 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
718 tx
->u
.tx
.extra_frag
[i
]->len
;
723 return TXRX_CONTINUE
;
726 static ieee80211_txrx_result
727 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
729 struct ieee80211_local
*local
= tx
->local
;
730 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
731 struct sk_buff
*skb
= tx
->skb
;
732 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
733 u32 load
= 0, hdrtime
;
735 /* TODO: this could be part of tx_status handling, so that the number
736 * of retries would be known; TX rate should in that case be stored
737 * somewhere with the packet */
739 /* Estimate total channel use caused by this frame */
741 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
742 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
744 if (mode
->mode
== MODE_IEEE80211A
||
745 (mode
->mode
== MODE_IEEE80211G
&&
746 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
747 hdrtime
= CHAN_UTIL_HDR_SHORT
;
749 hdrtime
= CHAN_UTIL_HDR_LONG
;
752 if (!is_multicast_ether_addr(hdr
->addr1
))
755 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
757 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
760 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
762 if (tx
->u
.tx
.extra_frag
) {
764 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
766 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
771 /* Divide channel_use by 8 to avoid wrapping around the counter */
772 load
>>= CHAN_UTIL_SHIFT
;
773 local
->channel_use_raw
+= load
;
775 tx
->sta
->channel_use_raw
+= load
;
776 tx
->sdata
->channel_use_raw
+= load
;
778 return TXRX_CONTINUE
;
781 /* TODO: implement register/unregister functions for adding TX/RX handlers
782 * into ordered list */
784 ieee80211_tx_handler ieee80211_tx_handlers
[] =
786 ieee80211_tx_h_check_assoc
,
787 ieee80211_tx_h_sequence
,
788 ieee80211_tx_h_ps_buf
,
789 ieee80211_tx_h_select_key
,
790 ieee80211_tx_h_michael_mic_add
,
791 ieee80211_tx_h_fragment
,
792 ieee80211_tx_h_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(struct ieee80211_txrx_data
*tx
,
810 * this is the moment to interpret and discard the radiotap header that
811 * must be at the start of the packet injected in Monitor mode
813 * Need to take some care with endian-ness since radiotap
814 * args are little-endian
817 struct ieee80211_radiotap_iterator iterator
;
818 struct ieee80211_radiotap_header
*rthdr
=
819 (struct ieee80211_radiotap_header
*) skb
->data
;
820 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
821 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
822 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
824 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
825 tx
->flags
|= IEEE80211_TXRXD_TX_INJECTED
;
826 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
829 * for every radiotap entry that is present
830 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
831 * entries present, or -EINVAL on error)
837 ret
= ieee80211_radiotap_iterator_next(&iterator
);
842 /* see if this argument is something we can use */
843 switch (iterator
.this_arg_index
) {
845 * You must take care when dereferencing iterator.this_arg
846 * for multibyte types... the pointer is not aligned. Use
847 * get_unaligned((type *)iterator.this_arg) to dereference
848 * iterator.this_arg for type "type" safely on all arches.
850 case IEEE80211_RADIOTAP_RATE
:
852 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
853 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
855 target_rate
= (*iterator
.this_arg
) * 5;
856 for (i
= 0; i
< mode
->num_rates
; i
++) {
857 struct ieee80211_rate
*r
= &mode
->rates
[i
];
859 if (r
->rate
== target_rate
) {
866 case IEEE80211_RADIOTAP_ANTENNA
:
868 * radiotap uses 0 for 1st ant, mac80211 is 1 for
871 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
874 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
875 control
->power_level
= *iterator
.this_arg
;
878 case IEEE80211_RADIOTAP_FLAGS
:
879 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
881 * this indicates that the skb we have been
882 * handed has the 32-bit FCS CRC at the end...
883 * we should react to that by snipping it off
884 * because it will be recomputed and added
887 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
890 skb_trim(skb
, skb
->len
- FCS_LEN
);
892 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
894 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
895 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
896 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
900 * Please update the file
901 * Documentation/networking/mac80211-injection.txt
902 * when parsing new fields here.
910 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
914 * remove the radiotap header
915 * iterator->max_length was sanity-checked against
916 * skb->len by iterator init
918 skb_pull(skb
, iterator
.max_length
);
920 return TXRX_CONTINUE
;
926 static ieee80211_txrx_result
927 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
929 struct net_device
*dev
,
930 struct ieee80211_tx_control
*control
)
932 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
933 struct ieee80211_hdr
*hdr
;
934 struct ieee80211_sub_if_data
*sdata
;
938 memset(tx
, 0, sizeof(*tx
));
940 tx
->dev
= dev
; /* use original interface */
942 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
943 tx
->u
.tx
.control
= control
;
945 * Set this flag (used below to indicate "automatic fragmentation"),
946 * it will be cleared/left by radiotap as desired.
948 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
950 /* process and remove the injection radiotap header */
951 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
952 if (unlikely(sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)) {
953 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TXRX_DROP
)
957 * __ieee80211_parse_tx_radiotap has now removed
958 * the radiotap header that was present and pre-filled
959 * 'tx' with tx control information.
963 hdr
= (struct ieee80211_hdr
*) skb
->data
;
965 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
966 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
968 if (is_multicast_ether_addr(hdr
->addr1
)) {
969 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
970 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
972 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
973 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
976 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
977 if ((tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
978 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
979 !local
->ops
->set_frag_threshold
)
980 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
982 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
986 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
987 else if (tx
->sta
->clear_dst_mask
) {
988 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
989 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
;
999 return TXRX_CONTINUE
;
1003 * NB: @tx is uninitialised when passed in here
1005 static int ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1006 struct sk_buff
*skb
,
1007 struct net_device
*mdev
,
1008 struct ieee80211_tx_control
*control
)
1010 struct ieee80211_tx_packet_data
*pkt_data
;
1011 struct net_device
*dev
;
1013 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1014 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1015 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1021 /* initialises tx with control */
1022 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1027 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1028 struct ieee80211_txrx_data
*tx
)
1030 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1033 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1034 __ieee80211_queue_stopped(local
, 0)) {
1035 netif_stop_queue(local
->mdev
);
1036 return IEEE80211_TX_AGAIN
;
1039 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1040 "TX to low-level driver", skb
);
1041 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1043 return IEEE80211_TX_AGAIN
;
1044 local
->mdev
->trans_start
= jiffies
;
1045 ieee80211_led_tx(local
, 1);
1047 if (tx
->u
.tx
.extra_frag
) {
1048 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1049 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1050 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1051 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1052 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1053 if (!tx
->u
.tx
.extra_frag
[i
])
1055 if (__ieee80211_queue_stopped(local
, control
->queue
))
1056 return IEEE80211_TX_FRAG_AGAIN
;
1057 if (i
== tx
->u
.tx
.num_extra_frag
) {
1058 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1059 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1060 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1062 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1065 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1068 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1069 "TX to low-level driver",
1070 tx
->u
.tx
.extra_frag
[i
]);
1071 ret
= local
->ops
->tx(local_to_hw(local
),
1072 tx
->u
.tx
.extra_frag
[i
],
1075 return IEEE80211_TX_FRAG_AGAIN
;
1076 local
->mdev
->trans_start
= jiffies
;
1077 ieee80211_led_tx(local
, 1);
1078 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1080 kfree(tx
->u
.tx
.extra_frag
);
1081 tx
->u
.tx
.extra_frag
= NULL
;
1083 return IEEE80211_TX_OK
;
1086 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1087 struct ieee80211_tx_control
*control
)
1089 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1090 struct sta_info
*sta
;
1091 ieee80211_tx_handler
*handler
;
1092 struct ieee80211_txrx_data tx
;
1093 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1096 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1098 if (unlikely(skb
->len
< 10)) {
1103 /* initialises tx */
1104 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1106 if (res_prepare
== TXRX_DROP
) {
1112 * key references are protected using RCU and this requires that
1113 * we are in a read-site RCU section during receive processing
1118 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1120 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1122 res
= (*handler
)(&tx
);
1123 if (res
!= TXRX_CONTINUE
)
1127 skb
= tx
.skb
; /* handlers are allowed to change skb */
1132 if (unlikely(res
== TXRX_DROP
)) {
1133 I802_DEBUG_INC(local
->tx_handlers_drop
);
1137 if (unlikely(res
== TXRX_QUEUED
)) {
1138 I802_DEBUG_INC(local
->tx_handlers_queued
);
1143 if (tx
.u
.tx
.extra_frag
) {
1144 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1146 struct ieee80211_hdr
*hdr
=
1147 (struct ieee80211_hdr
*)
1148 tx
.u
.tx
.extra_frag
[i
]->data
;
1150 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1151 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1154 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1155 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1157 dur
= ieee80211_duration(&tx
, 0, next_len
);
1158 hdr
->duration_id
= cpu_to_le16(dur
);
1163 ret
= __ieee80211_tx(local
, skb
, &tx
);
1165 struct ieee80211_tx_stored_packet
*store
=
1166 &local
->pending_packet
[control
->queue
];
1168 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1170 set_bit(IEEE80211_LINK_STATE_PENDING
,
1171 &local
->state
[control
->queue
]);
1173 /* When the driver gets out of buffers during sending of
1174 * fragments and calls ieee80211_stop_queue, there is
1175 * a small window between IEEE80211_LINK_STATE_XOFF and
1176 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1177 * gets available in that window (i.e. driver calls
1178 * ieee80211_wake_queue), we would end up with ieee80211_tx
1179 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1180 * continuing transmitting here when that situation is
1181 * possible to have happened. */
1182 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1183 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1184 &local
->state
[control
->queue
]);
1187 memcpy(&store
->control
, control
,
1188 sizeof(struct ieee80211_tx_control
));
1190 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1191 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1192 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1193 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1194 store
->last_frag_rate_ctrl_probe
=
1195 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1203 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1204 if (tx
.u
.tx
.extra_frag
[i
])
1205 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1206 kfree(tx
.u
.tx
.extra_frag
);
1211 /* device xmit handlers */
1213 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1214 struct net_device
*dev
)
1216 struct ieee80211_tx_control control
;
1217 struct ieee80211_tx_packet_data
*pkt_data
;
1218 struct net_device
*odev
= NULL
;
1219 struct ieee80211_sub_if_data
*osdata
;
1224 * copy control out of the skb so other people can use skb->cb
1226 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1227 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1229 if (pkt_data
->ifindex
)
1230 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1231 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1235 if (unlikely(!odev
)) {
1236 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1237 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1238 "originating device\n", dev
->name
);
1243 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1245 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1246 if (skb_headroom(skb
) < headroom
) {
1247 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1254 control
.vif
= &osdata
->vif
;
1255 control
.type
= osdata
->vif
.type
;
1256 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1257 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1258 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1259 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1260 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1261 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1262 if (pkt_data
->flags
& IEEE80211_TXPD_EAPOL_FRAME
)
1263 control
.flags
|= IEEE80211_TXCTL_EAPOL_FRAME
;
1264 control
.queue
= pkt_data
->queue
;
1266 ret
= ieee80211_tx(odev
, skb
, &control
);
1272 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1273 struct net_device
*dev
)
1275 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1276 struct ieee80211_tx_packet_data
*pkt_data
;
1277 struct ieee80211_radiotap_header
*prthdr
=
1278 (struct ieee80211_radiotap_header
*)skb
->data
;
1281 /* check for not even having the fixed radiotap header part */
1282 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1283 goto fail
; /* too short to be possibly valid */
1285 /* is it a header version we can trust to find length from? */
1286 if (unlikely(prthdr
->it_version
))
1287 goto fail
; /* only version 0 is supported */
1289 /* then there must be a radiotap header with a length we can use */
1290 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1292 /* does the skb contain enough to deliver on the alleged length? */
1293 if (unlikely(skb
->len
< len_rthdr
))
1294 goto fail
; /* skb too short for claimed rt header extent */
1296 skb
->dev
= local
->mdev
;
1298 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1299 memset(pkt_data
, 0, sizeof(*pkt_data
));
1300 /* needed because we set skb device to master */
1301 pkt_data
->ifindex
= dev
->ifindex
;
1303 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1306 * fix up the pointers accounting for the radiotap
1307 * header still being in there. We are being given
1308 * a precooked IEEE80211 header so no need for
1311 skb_set_mac_header(skb
, len_rthdr
);
1313 * these are just fixed to the end of the rt area since we
1314 * don't have any better information and at this point, nobody cares
1316 skb_set_network_header(skb
, len_rthdr
);
1317 skb_set_transport_header(skb
, len_rthdr
);
1319 /* pass the radiotap header up to the next stage intact */
1320 dev_queue_xmit(skb
);
1321 return NETDEV_TX_OK
;
1325 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1329 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1330 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1331 * @skb: packet to be sent
1332 * @dev: incoming interface
1334 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1335 * not be freed, and caller is responsible for either retrying later or freeing
1338 * This function takes in an Ethernet header and encapsulates it with suitable
1339 * IEEE 802.11 header based on which interface the packet is coming in. The
1340 * encapsulated packet will then be passed to master interface, wlan#.11, for
1341 * transmission (through low-level driver).
1343 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1344 struct net_device
*dev
)
1346 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1347 struct ieee80211_tx_packet_data
*pkt_data
;
1348 struct ieee80211_sub_if_data
*sdata
;
1349 int ret
= 1, head_need
;
1350 u16 ethertype
, hdrlen
, fc
;
1351 struct ieee80211_hdr hdr
;
1352 const u8
*encaps_data
;
1353 int encaps_len
, skip_header_bytes
;
1355 struct sta_info
*sta
;
1358 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1359 if (unlikely(skb
->len
< ETH_HLEN
)) {
1360 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1361 dev
->name
, skb
->len
);
1366 nh_pos
= skb_network_header(skb
) - skb
->data
;
1367 h_pos
= skb_transport_header(skb
) - skb
->data
;
1369 /* convert Ethernet header to proper 802.11 header (based on
1370 * operation mode) */
1371 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1372 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1374 switch (sdata
->vif
.type
) {
1375 case IEEE80211_IF_TYPE_AP
:
1376 case IEEE80211_IF_TYPE_VLAN
:
1377 fc
|= IEEE80211_FCTL_FROMDS
;
1379 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1380 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1381 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1384 case IEEE80211_IF_TYPE_WDS
:
1385 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1387 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1388 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1389 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1390 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1393 case IEEE80211_IF_TYPE_STA
:
1394 fc
|= IEEE80211_FCTL_TODS
;
1396 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1397 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1398 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1401 case IEEE80211_IF_TYPE_IBSS
:
1403 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1404 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1405 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1413 sta
= sta_info_get(local
, hdr
.addr1
);
1415 sta_flags
= sta
->flags
;
1419 /* receiver is QoS enabled, use a QoS type frame */
1420 if (sta_flags
& WLAN_STA_WME
) {
1421 fc
|= IEEE80211_STYPE_QOS_DATA
;
1426 * If port access control is enabled, drop frames to unauthorised
1427 * stations unless they are EAPOL frames from the local station.
1429 if (unlikely(sdata
->ieee802_1x_pac
&&
1430 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1431 !(ethertype
== ETH_P_PAE
&&
1432 compare_ether_addr(dev
->dev_addr
,
1433 skb
->data
+ ETH_ALEN
) == 0))) {
1434 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1435 DECLARE_MAC_BUF(mac
);
1437 if (net_ratelimit())
1438 printk(KERN_DEBUG
"%s: dropped frame to %s"
1439 " (unauthorized port)\n", dev
->name
,
1440 print_mac(mac
, hdr
.addr1
));
1443 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1449 hdr
.frame_control
= cpu_to_le16(fc
);
1450 hdr
.duration_id
= 0;
1453 skip_header_bytes
= ETH_HLEN
;
1454 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1455 encaps_data
= bridge_tunnel_header
;
1456 encaps_len
= sizeof(bridge_tunnel_header
);
1457 skip_header_bytes
-= 2;
1458 } else if (ethertype
>= 0x600) {
1459 encaps_data
= rfc1042_header
;
1460 encaps_len
= sizeof(rfc1042_header
);
1461 skip_header_bytes
-= 2;
1467 skb_pull(skb
, skip_header_bytes
);
1468 nh_pos
-= skip_header_bytes
;
1469 h_pos
-= skip_header_bytes
;
1471 /* TODO: implement support for fragments so that there is no need to
1472 * reallocate and copy payload; it might be enough to support one
1473 * extra fragment that would be copied in the beginning of the frame
1474 * data.. anyway, it would be nice to include this into skb structure
1477 * There are few options for this:
1478 * use skb->cb as an extra space for 802.11 header
1479 * allocate new buffer if not enough headroom
1480 * make sure that there is enough headroom in every skb by increasing
1481 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1482 * alloc_skb() (net/core/skbuff.c)
1484 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1485 head_need
-= skb_headroom(skb
);
1487 /* We are going to modify skb data, so make a copy of it if happens to
1488 * be cloned. This could happen, e.g., with Linux bridge code passing
1489 * us broadcast frames. */
1491 if (head_need
> 0 || skb_cloned(skb
)) {
1493 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1494 "of headroom\n", dev
->name
, head_need
);
1497 if (skb_cloned(skb
))
1498 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1500 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1501 /* Since we have to reallocate the buffer, make sure that there
1502 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1503 * before payload and 12 after). */
1504 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1506 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1513 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1514 nh_pos
+= encaps_len
;
1515 h_pos
+= encaps_len
;
1518 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1519 __le16
*qos_control
;
1521 qos_control
= (__le16
*) skb_push(skb
, 2);
1522 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1524 * Maybe we could actually set some fields here, for now just
1525 * initialise to zero to indicate no special operation.
1529 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1534 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1535 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1536 pkt_data
->ifindex
= dev
->ifindex
;
1537 if (ethertype
== ETH_P_PAE
)
1538 pkt_data
->flags
|= IEEE80211_TXPD_EAPOL_FRAME
;
1540 skb
->dev
= local
->mdev
;
1541 dev
->stats
.tx_packets
++;
1542 dev
->stats
.tx_bytes
+= skb
->len
;
1544 /* Update skb pointers to various headers since this modified frame
1545 * is going to go through Linux networking code that may potentially
1546 * need things like pointer to IP header. */
1547 skb_set_mac_header(skb
, 0);
1548 skb_set_network_header(skb
, nh_pos
);
1549 skb_set_transport_header(skb
, h_pos
);
1551 dev
->trans_start
= jiffies
;
1552 dev_queue_xmit(skb
);
1563 /* helper functions for pending packets for when queues are stopped */
1565 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1568 struct ieee80211_tx_stored_packet
*store
;
1570 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1571 if (!__ieee80211_queue_pending(local
, i
))
1573 store
= &local
->pending_packet
[i
];
1574 kfree_skb(store
->skb
);
1575 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1576 kfree_skb(store
->extra_frag
[j
]);
1577 kfree(store
->extra_frag
);
1578 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1582 void ieee80211_tx_pending(unsigned long data
)
1584 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1585 struct net_device
*dev
= local
->mdev
;
1586 struct ieee80211_tx_stored_packet
*store
;
1587 struct ieee80211_txrx_data tx
;
1588 int i
, ret
, reschedule
= 0;
1590 netif_tx_lock_bh(dev
);
1591 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1592 if (__ieee80211_queue_stopped(local
, i
))
1594 if (!__ieee80211_queue_pending(local
, i
)) {
1598 store
= &local
->pending_packet
[i
];
1599 tx
.u
.tx
.control
= &store
->control
;
1600 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1601 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1602 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1603 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1605 if (store
->last_frag_rate_ctrl_probe
)
1606 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1607 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1609 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1612 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1617 netif_tx_unlock_bh(dev
);
1619 if (!ieee80211_qdisc_installed(dev
)) {
1620 if (!__ieee80211_queue_stopped(local
, 0))
1621 netif_wake_queue(dev
);
1623 netif_schedule(dev
);
1627 /* functions for drivers to get certain frames */
1629 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1630 struct ieee80211_if_ap
*bss
,
1631 struct sk_buff
*skb
)
1635 int i
, have_bits
= 0, n1
, n2
;
1637 /* Generate bitmap for TIM only if there are any STAs in power save
1639 read_lock_bh(&local
->sta_lock
);
1640 if (atomic_read(&bss
->num_sta_ps
) > 0)
1641 /* in the hope that this is faster than
1642 * checking byte-for-byte */
1643 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1644 IEEE80211_MAX_AID
+1);
1646 if (bss
->dtim_count
== 0)
1647 bss
->dtim_count
= bss
->dtim_period
- 1;
1651 tim
= pos
= (u8
*) skb_put(skb
, 6);
1652 *pos
++ = WLAN_EID_TIM
;
1654 *pos
++ = bss
->dtim_count
;
1655 *pos
++ = bss
->dtim_period
;
1657 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1661 /* Find largest even number N1 so that bits numbered 1 through
1662 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1663 * (N2 + 1) x 8 through 2007 are 0. */
1665 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1672 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1679 /* Bitmap control */
1681 /* Part Virt Bitmap */
1682 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1684 tim
[1] = n2
- n1
+ 4;
1685 skb_put(skb
, n2
- n1
);
1687 *pos
++ = aid0
; /* Bitmap control */
1688 *pos
++ = 0; /* Part Virt Bitmap */
1690 read_unlock_bh(&local
->sta_lock
);
1693 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1694 struct ieee80211_vif
*vif
,
1695 struct ieee80211_tx_control
*control
)
1697 struct ieee80211_local
*local
= hw_to_local(hw
);
1698 struct sk_buff
*skb
;
1699 struct net_device
*bdev
;
1700 struct ieee80211_sub_if_data
*sdata
= NULL
;
1701 struct ieee80211_if_ap
*ap
= NULL
;
1702 struct rate_selection rsel
;
1703 u8
*b_head
, *b_tail
;
1706 sdata
= vif_to_sdata(vif
);
1710 if (!ap
|| sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
||
1712 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1713 if (net_ratelimit())
1714 printk(KERN_DEBUG
"no beacon data avail for %s\n",
1716 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1720 /* Assume we are generating the normal beacon locally */
1721 b_head
= ap
->beacon_head
;
1722 b_tail
= ap
->beacon_tail
;
1723 bh_len
= ap
->beacon_head_len
;
1724 bt_len
= ap
->beacon_tail_len
;
1726 skb
= dev_alloc_skb(local
->tx_headroom
+
1727 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1731 skb_reserve(skb
, local
->tx_headroom
);
1732 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1734 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1736 ieee80211_beacon_add_tim(local
, ap
, skb
);
1739 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1743 rate_control_get_rate(local
->mdev
, local
->oper_hw_mode
, skb
,
1746 if (net_ratelimit()) {
1747 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1749 wiphy_name(local
->hw
.wiphy
));
1756 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1757 (rsel
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1758 rsel
.rate
->val2
: rsel
.rate
->val
;
1759 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1760 control
->power_level
= local
->hw
.conf
.power_level
;
1761 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1762 control
->retry_limit
= 1;
1763 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1769 EXPORT_SYMBOL(ieee80211_beacon_get
);
1771 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1772 const void *frame
, size_t frame_len
,
1773 const struct ieee80211_tx_control
*frame_txctl
,
1774 struct ieee80211_rts
*rts
)
1776 const struct ieee80211_hdr
*hdr
= frame
;
1779 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1780 rts
->frame_control
= cpu_to_le16(fctl
);
1781 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1783 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1784 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1786 EXPORT_SYMBOL(ieee80211_rts_get
);
1788 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1789 const void *frame
, size_t frame_len
,
1790 const struct ieee80211_tx_control
*frame_txctl
,
1791 struct ieee80211_cts
*cts
)
1793 const struct ieee80211_hdr
*hdr
= frame
;
1796 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1797 cts
->frame_control
= cpu_to_le16(fctl
);
1798 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
1799 frame_len
, frame_txctl
);
1800 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1802 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1805 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
1806 struct ieee80211_vif
*vif
,
1807 struct ieee80211_tx_control
*control
)
1809 struct ieee80211_local
*local
= hw_to_local(hw
);
1810 struct sk_buff
*skb
;
1811 struct sta_info
*sta
;
1812 ieee80211_tx_handler
*handler
;
1813 struct ieee80211_txrx_data tx
;
1814 ieee80211_txrx_result res
= TXRX_DROP
;
1815 struct net_device
*bdev
;
1816 struct ieee80211_sub_if_data
*sdata
;
1817 struct ieee80211_if_ap
*bss
= NULL
;
1819 sdata
= vif_to_sdata(vif
);
1822 if (!bss
|| sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
||
1826 if (bss
->dtim_count
!= 0)
1827 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1828 memset(control
, 0, sizeof(*control
));
1830 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1833 local
->total_ps_buffered
--;
1835 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1836 struct ieee80211_hdr
*hdr
=
1837 (struct ieee80211_hdr
*) skb
->data
;
1838 /* more buffered multicast/broadcast frames ==> set
1839 * MoreData flag in IEEE 802.11 header to inform PS
1841 hdr
->frame_control
|=
1842 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1845 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
))
1847 dev_kfree_skb_any(skb
);
1850 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1851 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1853 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1854 res
= (*handler
)(&tx
);
1855 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1858 skb
= tx
.skb
; /* handlers are allowed to change skb */
1860 if (res
== TXRX_DROP
) {
1861 I802_DEBUG_INC(local
->tx_handlers_drop
);
1864 } else if (res
== TXRX_QUEUED
) {
1865 I802_DEBUG_INC(local
->tx_handlers_queued
);
1874 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);