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
->local
->sta_scanning
!= 0) &&
226 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
227 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
230 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
231 return TXRX_CONTINUE
;
233 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
235 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
236 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
237 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
238 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
239 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
240 DECLARE_MAC_BUF(mac
);
241 printk(KERN_DEBUG
"%s: dropped data frame to not "
242 "associated station %s\n",
243 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
244 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
245 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
249 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
250 tx
->local
->num_sta
== 0 &&
251 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
)) {
253 * No associated STAs - no need to send multicast
258 return TXRX_CONTINUE
;
261 if (unlikely(/* !injected && */ tx
->sdata
->ieee802_1x
&&
262 !(sta_flags
& WLAN_STA_AUTHORIZED
))) {
263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
264 DECLARE_MAC_BUF(mac
);
265 printk(KERN_DEBUG
"%s: dropped frame to %s"
266 " (unauthorized port)\n", tx
->dev
->name
,
267 print_mac(mac
, hdr
->addr1
));
269 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
273 return TXRX_CONTINUE
;
276 static ieee80211_txrx_result
277 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
279 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
281 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
282 ieee80211_include_sequence(tx
->sdata
, hdr
);
284 return TXRX_CONTINUE
;
287 /* This function is called whenever the AP is about to exceed the maximum limit
288 * of buffered frames for power saving STAs. This situation should not really
289 * happen often during normal operation, so dropping the oldest buffered packet
290 * from each queue should be OK to make some room for new frames. */
291 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
293 int total
= 0, purged
= 0;
295 struct ieee80211_sub_if_data
*sdata
;
296 struct sta_info
*sta
;
299 * virtual interfaces are protected by RCU
303 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
304 struct ieee80211_if_ap
*ap
;
305 if (sdata
->dev
== local
->mdev
||
306 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
309 skb
= skb_dequeue(&ap
->ps_bc_buf
);
314 total
+= skb_queue_len(&ap
->ps_bc_buf
);
318 read_lock_bh(&local
->sta_lock
);
319 list_for_each_entry(sta
, &local
->sta_list
, list
) {
320 skb
= skb_dequeue(&sta
->ps_tx_buf
);
325 total
+= skb_queue_len(&sta
->ps_tx_buf
);
327 read_unlock_bh(&local
->sta_lock
);
329 local
->total_ps_buffered
= total
;
330 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
331 wiphy_name(local
->hw
.wiphy
), purged
);
334 static inline ieee80211_txrx_result
335 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
337 /* broadcast/multicast frame */
338 /* If any of the associated stations is in power save mode,
339 * the frame is buffered to be sent after DTIM beacon frame */
340 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
341 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
342 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
343 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
344 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
345 purge_old_ps_buffers(tx
->local
);
346 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
348 if (net_ratelimit()) {
349 printk(KERN_DEBUG
"%s: BC TX buffer full - "
350 "dropping the oldest frame\n",
353 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
355 tx
->local
->total_ps_buffered
++;
356 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
360 return TXRX_CONTINUE
;
363 static inline ieee80211_txrx_result
364 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
366 struct sta_info
*sta
= tx
->sta
;
367 DECLARE_MAC_BUF(mac
);
370 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
371 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
372 return TXRX_CONTINUE
;
374 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
375 struct ieee80211_tx_packet_data
*pkt_data
;
376 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
377 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
379 print_mac(mac
, sta
->addr
), sta
->aid
,
380 skb_queue_len(&sta
->ps_tx_buf
));
381 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
382 sta
->flags
|= WLAN_STA_TIM
;
383 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
384 purge_old_ps_buffers(tx
->local
);
385 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
386 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
387 if (net_ratelimit()) {
388 printk(KERN_DEBUG
"%s: STA %s TX "
389 "buffer full - dropping oldest frame\n",
390 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
394 tx
->local
->total_ps_buffered
++;
395 /* Queue frame to be sent after STA sends an PS Poll frame */
396 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
397 if (tx
->local
->ops
->set_tim
)
398 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
401 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
403 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
404 pkt_data
->jiffies
= jiffies
;
405 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
408 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
409 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
410 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
411 "set -> send frame\n", tx
->dev
->name
,
412 print_mac(mac
, sta
->addr
));
414 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
417 return TXRX_CONTINUE
;
421 static ieee80211_txrx_result
422 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
424 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
425 return TXRX_CONTINUE
;
427 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
428 return ieee80211_tx_h_unicast_ps_buf(tx
);
430 return ieee80211_tx_h_multicast_ps_buf(tx
);
436 static ieee80211_txrx_result
437 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
439 struct ieee80211_key
*key
;
441 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
443 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
445 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
447 else if (tx
->sdata
->drop_unencrypted
&&
448 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
449 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
453 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
457 tx
->key
->tx_rx_count
++;
458 /* TODO: add threshold stuff again */
461 return TXRX_CONTINUE
;
464 static ieee80211_txrx_result
465 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
467 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
468 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
469 struct sk_buff
**frags
, *first
, *frag
;
473 int frag_threshold
= tx
->local
->fragmentation_threshold
;
475 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
476 return TXRX_CONTINUE
;
480 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
481 payload_len
= first
->len
- hdrlen
;
482 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
483 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
485 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
489 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
490 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
491 pos
= first
->data
+ hdrlen
+ per_fragm
;
492 left
= payload_len
- per_fragm
;
493 for (i
= 0; i
< num_fragm
- 1; i
++) {
494 struct ieee80211_hdr
*fhdr
;
500 /* reserve enough extra head and tail room for possible
503 dev_alloc_skb(tx
->local
->tx_headroom
+
505 IEEE80211_ENCRYPT_HEADROOM
+
506 IEEE80211_ENCRYPT_TAILROOM
);
509 /* Make sure that all fragments use the same priority so
510 * that they end up using the same TX queue */
511 frag
->priority
= first
->priority
;
512 skb_reserve(frag
, tx
->local
->tx_headroom
+
513 IEEE80211_ENCRYPT_HEADROOM
);
514 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
515 memcpy(fhdr
, first
->data
, hdrlen
);
516 if (i
== num_fragm
- 2)
517 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
518 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
519 copylen
= left
> per_fragm
? per_fragm
: left
;
520 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
525 skb_trim(first
, hdrlen
+ per_fragm
);
527 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
528 tx
->u
.tx
.extra_frag
= frags
;
530 return TXRX_CONTINUE
;
533 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
535 for (i
= 0; i
< num_fragm
- 1; i
++)
537 dev_kfree_skb(frags
[i
]);
540 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
544 static ieee80211_txrx_result
545 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data
*tx
)
548 return TXRX_CONTINUE
;
550 switch (tx
->key
->conf
.alg
) {
552 return ieee80211_crypto_wep_encrypt(tx
);
554 return ieee80211_crypto_tkip_encrypt(tx
);
556 return ieee80211_crypto_ccmp_encrypt(tx
);
558 return TXRX_CONTINUE
;
566 static ieee80211_txrx_result
567 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
569 struct rate_control_extra extra
;
571 memset(&extra
, 0, sizeof(extra
));
572 extra
.mode
= tx
->u
.tx
.mode
;
573 extra
.ethertype
= tx
->ethertype
;
575 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
, tx
->skb
,
577 if (unlikely(extra
.probe
!= NULL
)) {
578 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_RATE_CTRL_PROBE
;
579 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
580 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
581 tx
->u
.tx
.rate
= extra
.probe
;
583 tx
->u
.tx
.control
->alt_retry_rate
= -1;
587 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
588 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
589 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
590 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
592 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
594 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
595 tx
->u
.tx
.rate
= extra
.nonerp
;
596 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
597 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
599 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
600 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
602 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
604 return TXRX_CONTINUE
;
607 static ieee80211_txrx_result
608 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
610 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
611 u16 fc
= le16_to_cpu(hdr
->frame_control
);
613 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
614 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
616 if (!is_multicast_ether_addr(hdr
->addr1
)) {
617 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
&&
618 tx
->local
->rts_threshold
< IEEE80211_MAX_RTS_THRESHOLD
) {
619 control
->flags
|= IEEE80211_TXCTL_USE_RTS_CTS
;
620 control
->flags
|= IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
621 control
->retry_limit
=
622 tx
->local
->long_retry_limit
;
624 control
->retry_limit
=
625 tx
->local
->short_retry_limit
;
628 control
->retry_limit
= 1;
631 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
632 /* Do not use multiple retry rates when sending fragmented
634 * TODO: The last fragment could still use multiple retry
636 control
->alt_retry_rate
= -1;
639 /* Use CTS protection for unicast frames sent using extended rates if
640 * there are associated non-ERP stations and RTS/CTS is not configured
642 if (mode
->mode
== MODE_IEEE80211G
&&
643 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
644 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
645 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
646 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
647 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
649 /* Transmit data frames using short preambles if the driver supports
650 * short preambles at the selected rate and short preambles are
651 * available on the network at the current point in time. */
652 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
653 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
654 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
655 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
656 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
659 /* Setup duration field for the first fragment of the frame. Duration
660 * for remaining fragments will be updated when they are being sent
661 * to low-level driver in ieee80211_tx(). */
662 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
663 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
664 tx
->u
.tx
.extra_frag
[0]->len
: 0);
665 hdr
->duration_id
= cpu_to_le16(dur
);
667 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
668 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
669 struct ieee80211_rate
*rate
;
671 /* Do not use multiple retry rates when using RTS/CTS */
672 control
->alt_retry_rate
= -1;
674 /* Use min(data rate, max base rate) as CTS/RTS rate */
675 rate
= tx
->u
.tx
.rate
;
676 while (rate
> mode
->rates
&&
677 !(rate
->flags
& IEEE80211_RATE_BASIC
))
680 control
->rts_cts_rate
= rate
->val
;
681 control
->rts_rate
= rate
;
685 tx
->sta
->tx_packets
++;
686 tx
->sta
->tx_fragments
++;
687 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
688 if (tx
->u
.tx
.extra_frag
) {
690 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
691 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
693 tx
->u
.tx
.extra_frag
[i
]->len
;
699 * Tell hardware to not encrypt when we had sw crypto.
700 * Because we use the same flag to internally indicate that
701 * no (software) encryption should be done, we have to set it
702 * after all crypto handlers.
704 if (tx
->key
&& !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
705 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
707 return TXRX_CONTINUE
;
710 static ieee80211_txrx_result
711 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
713 struct ieee80211_local
*local
= tx
->local
;
714 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
715 struct sk_buff
*skb
= tx
->skb
;
716 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
717 u32 load
= 0, hdrtime
;
719 /* TODO: this could be part of tx_status handling, so that the number
720 * of retries would be known; TX rate should in that case be stored
721 * somewhere with the packet */
723 /* Estimate total channel use caused by this frame */
725 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
726 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
728 if (mode
->mode
== MODE_IEEE80211A
||
729 (mode
->mode
== MODE_IEEE80211G
&&
730 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
731 hdrtime
= CHAN_UTIL_HDR_SHORT
;
733 hdrtime
= CHAN_UTIL_HDR_LONG
;
736 if (!is_multicast_ether_addr(hdr
->addr1
))
739 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
741 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
744 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
746 if (tx
->u
.tx
.extra_frag
) {
748 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
750 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
755 /* Divide channel_use by 8 to avoid wrapping around the counter */
756 load
>>= CHAN_UTIL_SHIFT
;
757 local
->channel_use_raw
+= load
;
759 tx
->sta
->channel_use_raw
+= load
;
760 tx
->sdata
->channel_use_raw
+= load
;
762 return TXRX_CONTINUE
;
765 /* TODO: implement register/unregister functions for adding TX/RX handlers
766 * into ordered list */
768 ieee80211_tx_handler ieee80211_tx_handlers
[] =
770 ieee80211_tx_h_check_assoc
,
771 ieee80211_tx_h_sequence
,
772 ieee80211_tx_h_ps_buf
,
773 ieee80211_tx_h_select_key
,
774 ieee80211_tx_h_michael_mic_add
,
775 ieee80211_tx_h_fragment
,
776 ieee80211_tx_h_encrypt
,
777 ieee80211_tx_h_rate_ctrl
,
779 ieee80211_tx_h_load_stats
,
783 /* actual transmit path */
786 * deal with packet injection down monitor interface
787 * with Radiotap Header -- only called for monitor mode interface
789 static ieee80211_txrx_result
790 __ieee80211_parse_tx_radiotap(
791 struct ieee80211_txrx_data
*tx
,
792 struct sk_buff
*skb
, struct ieee80211_tx_control
*control
)
795 * this is the moment to interpret and discard the radiotap header that
796 * must be at the start of the packet injected in Monitor mode
798 * Need to take some care with endian-ness since radiotap
799 * args are little-endian
802 struct ieee80211_radiotap_iterator iterator
;
803 struct ieee80211_radiotap_header
*rthdr
=
804 (struct ieee80211_radiotap_header
*) skb
->data
;
805 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
806 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
809 * default control situation for all injected packets
810 * FIXME: this does not suit all usage cases, expand to allow control
813 control
->retry_limit
= 1; /* no retry */
814 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
815 IEEE80211_TXCTL_USE_CTS_PROTECT
);
816 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
|
817 IEEE80211_TXCTL_NO_ACK
;
818 control
->antenna_sel_tx
= 0; /* default to default antenna */
821 * for every radiotap entry that is present
822 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
823 * entries present, or -EINVAL on error)
829 ret
= ieee80211_radiotap_iterator_next(&iterator
);
834 /* see if this argument is something we can use */
835 switch (iterator
.this_arg_index
) {
837 * You must take care when dereferencing iterator.this_arg
838 * for multibyte types... the pointer is not aligned. Use
839 * get_unaligned((type *)iterator.this_arg) to dereference
840 * iterator.this_arg for type "type" safely on all arches.
842 case IEEE80211_RADIOTAP_RATE
:
844 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
845 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
847 target_rate
= (*iterator
.this_arg
) * 5;
848 for (i
= 0; i
< mode
->num_rates
; i
++) {
849 struct ieee80211_rate
*r
= &mode
->rates
[i
];
851 if (r
->rate
> target_rate
)
856 if (r
->flags
& IEEE80211_RATE_PREAMBLE2
)
857 control
->tx_rate
= r
->val2
;
859 control
->tx_rate
= r
->val
;
861 /* end on exact match */
862 if (r
->rate
== target_rate
)
867 case IEEE80211_RADIOTAP_ANTENNA
:
869 * radiotap uses 0 for 1st ant, mac80211 is 1 for
872 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
875 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
876 control
->power_level
= *iterator
.this_arg
;
879 case IEEE80211_RADIOTAP_FLAGS
:
880 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
882 * this indicates that the skb we have been
883 * handed has the 32-bit FCS CRC at the end...
884 * we should react to that by snipping it off
885 * because it will be recomputed and added
888 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
891 skb_trim(skb
, skb
->len
- FCS_LEN
);
900 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
904 * remove the radiotap header
905 * iterator->max_length was sanity-checked against
906 * skb->len by iterator init
908 skb_pull(skb
, iterator
.max_length
);
910 return TXRX_CONTINUE
;
913 static ieee80211_txrx_result
inline
914 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
916 struct net_device
*dev
,
917 struct ieee80211_tx_control
*control
)
919 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
920 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
921 struct ieee80211_sub_if_data
*sdata
;
922 ieee80211_txrx_result res
= TXRX_CONTINUE
;
926 memset(tx
, 0, sizeof(*tx
));
928 tx
->dev
= dev
; /* use original interface */
930 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
933 * set defaults for things that can be set by
934 * injected radiotap headers
936 control
->power_level
= local
->hw
.conf
.power_level
;
937 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
939 /* process and remove the injection radiotap header */
940 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
941 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
942 if (__ieee80211_parse_tx_radiotap(tx
, skb
, control
) ==
947 * we removed the radiotap header after this point,
948 * we filled control with what we could use
949 * set to the actual ieee header now
951 hdr
= (struct ieee80211_hdr
*) skb
->data
;
952 res
= TXRX_QUEUED
; /* indication it was monitor packet */
955 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
956 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
957 tx
->u
.tx
.control
= control
;
958 if (is_multicast_ether_addr(hdr
->addr1
)) {
959 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
960 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
962 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
963 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
965 if (local
->fragmentation_threshold
< IEEE80211_MAX_FRAG_THRESHOLD
&&
966 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
967 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
968 !local
->ops
->set_frag_threshold
)
969 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
971 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
973 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
974 else if (tx
->sta
->clear_dst_mask
) {
975 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
976 tx
->sta
->clear_dst_mask
= 0;
978 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
979 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
980 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
981 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
983 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
988 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
989 * finished with it. */
990 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
992 struct net_device
*mdev
,
993 struct ieee80211_tx_control
*control
)
995 struct ieee80211_tx_packet_data
*pkt_data
;
996 struct net_device
*dev
;
998 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
999 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1000 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1006 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1010 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1011 struct ieee80211_txrx_data
*tx
)
1013 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1016 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1017 __ieee80211_queue_stopped(local
, 0)) {
1018 netif_stop_queue(local
->mdev
);
1019 return IEEE80211_TX_AGAIN
;
1022 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1023 "TX to low-level driver", skb
);
1024 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1026 return IEEE80211_TX_AGAIN
;
1027 local
->mdev
->trans_start
= jiffies
;
1028 ieee80211_led_tx(local
, 1);
1030 if (tx
->u
.tx
.extra_frag
) {
1031 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1032 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1033 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1034 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1035 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1036 if (!tx
->u
.tx
.extra_frag
[i
])
1038 if (__ieee80211_queue_stopped(local
, control
->queue
))
1039 return IEEE80211_TX_FRAG_AGAIN
;
1040 if (i
== tx
->u
.tx
.num_extra_frag
) {
1041 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1042 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1043 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1045 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1048 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1051 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1052 "TX to low-level driver",
1053 tx
->u
.tx
.extra_frag
[i
]);
1054 ret
= local
->ops
->tx(local_to_hw(local
),
1055 tx
->u
.tx
.extra_frag
[i
],
1058 return IEEE80211_TX_FRAG_AGAIN
;
1059 local
->mdev
->trans_start
= jiffies
;
1060 ieee80211_led_tx(local
, 1);
1061 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1063 kfree(tx
->u
.tx
.extra_frag
);
1064 tx
->u
.tx
.extra_frag
= NULL
;
1066 return IEEE80211_TX_OK
;
1069 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1070 struct ieee80211_tx_control
*control
)
1072 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1073 struct sta_info
*sta
;
1074 ieee80211_tx_handler
*handler
;
1075 struct ieee80211_txrx_data tx
;
1076 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1079 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1081 if (unlikely(skb
->len
< 10)) {
1086 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1088 if (res_prepare
== TXRX_DROP
) {
1094 * key references are protected using RCU and this requires that
1095 * we are in a read-site RCU section during receive processing
1100 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1102 if (res_prepare
== TXRX_QUEUED
) { /* if it was an injected packet */
1103 res
= TXRX_CONTINUE
;
1105 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1107 res
= (*handler
)(&tx
);
1108 if (res
!= TXRX_CONTINUE
)
1113 skb
= tx
.skb
; /* handlers are allowed to change skb */
1118 if (unlikely(res
== TXRX_DROP
)) {
1119 I802_DEBUG_INC(local
->tx_handlers_drop
);
1123 if (unlikely(res
== TXRX_QUEUED
)) {
1124 I802_DEBUG_INC(local
->tx_handlers_queued
);
1129 if (tx
.u
.tx
.extra_frag
) {
1130 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1132 struct ieee80211_hdr
*hdr
=
1133 (struct ieee80211_hdr
*)
1134 tx
.u
.tx
.extra_frag
[i
]->data
;
1136 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1137 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1140 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1141 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1143 dur
= ieee80211_duration(&tx
, 0, next_len
);
1144 hdr
->duration_id
= cpu_to_le16(dur
);
1149 ret
= __ieee80211_tx(local
, skb
, &tx
);
1151 struct ieee80211_tx_stored_packet
*store
=
1152 &local
->pending_packet
[control
->queue
];
1154 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1156 set_bit(IEEE80211_LINK_STATE_PENDING
,
1157 &local
->state
[control
->queue
]);
1159 /* When the driver gets out of buffers during sending of
1160 * fragments and calls ieee80211_stop_queue, there is
1161 * a small window between IEEE80211_LINK_STATE_XOFF and
1162 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1163 * gets available in that window (i.e. driver calls
1164 * ieee80211_wake_queue), we would end up with ieee80211_tx
1165 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1166 * continuing transmitting here when that situation is
1167 * possible to have happened. */
1168 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1169 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1170 &local
->state
[control
->queue
]);
1173 memcpy(&store
->control
, control
,
1174 sizeof(struct ieee80211_tx_control
));
1176 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1177 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1178 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1179 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1180 store
->last_frag_rate_ctrl_probe
=
1181 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1189 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1190 if (tx
.u
.tx
.extra_frag
[i
])
1191 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1192 kfree(tx
.u
.tx
.extra_frag
);
1197 /* device xmit handlers */
1199 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1200 struct net_device
*dev
)
1202 struct ieee80211_tx_control control
;
1203 struct ieee80211_tx_packet_data
*pkt_data
;
1204 struct net_device
*odev
= NULL
;
1205 struct ieee80211_sub_if_data
*osdata
;
1210 * copy control out of the skb so other people can use skb->cb
1212 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1213 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1215 if (pkt_data
->ifindex
)
1216 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1217 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1221 if (unlikely(!odev
)) {
1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1223 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1224 "originating device\n", dev
->name
);
1229 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1231 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1232 if (skb_headroom(skb
) < headroom
) {
1233 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1240 control
.ifindex
= odev
->ifindex
;
1241 control
.type
= osdata
->type
;
1242 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1243 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1244 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1245 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1246 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1247 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1248 control
.queue
= pkt_data
->queue
;
1250 ret
= ieee80211_tx(odev
, skb
, &control
);
1256 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1257 struct net_device
*dev
)
1259 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1260 struct ieee80211_tx_packet_data
*pkt_data
;
1261 struct ieee80211_radiotap_header
*prthdr
=
1262 (struct ieee80211_radiotap_header
*)skb
->data
;
1265 /* check for not even having the fixed radiotap header part */
1266 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1267 goto fail
; /* too short to be possibly valid */
1269 /* is it a header version we can trust to find length from? */
1270 if (unlikely(prthdr
->it_version
))
1271 goto fail
; /* only version 0 is supported */
1273 /* then there must be a radiotap header with a length we can use */
1274 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1276 /* does the skb contain enough to deliver on the alleged length? */
1277 if (unlikely(skb
->len
< len_rthdr
))
1278 goto fail
; /* skb too short for claimed rt header extent */
1280 skb
->dev
= local
->mdev
;
1282 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1283 memset(pkt_data
, 0, sizeof(*pkt_data
));
1284 /* needed because we set skb device to master */
1285 pkt_data
->ifindex
= dev
->ifindex
;
1287 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1290 * fix up the pointers accounting for the radiotap
1291 * header still being in there. We are being given
1292 * a precooked IEEE80211 header so no need for
1295 skb_set_mac_header(skb
, len_rthdr
);
1297 * these are just fixed to the end of the rt area since we
1298 * don't have any better information and at this point, nobody cares
1300 skb_set_network_header(skb
, len_rthdr
);
1301 skb_set_transport_header(skb
, len_rthdr
);
1303 /* pass the radiotap header up to the next stage intact */
1304 dev_queue_xmit(skb
);
1305 return NETDEV_TX_OK
;
1309 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1313 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1314 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1315 * @skb: packet to be sent
1316 * @dev: incoming interface
1318 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1319 * not be freed, and caller is responsible for either retrying later or freeing
1322 * This function takes in an Ethernet header and encapsulates it with suitable
1323 * IEEE 802.11 header based on which interface the packet is coming in. The
1324 * encapsulated packet will then be passed to master interface, wlan#.11, for
1325 * transmission (through low-level driver).
1327 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1328 struct net_device
*dev
)
1330 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1331 struct ieee80211_tx_packet_data
*pkt_data
;
1332 struct ieee80211_sub_if_data
*sdata
;
1333 int ret
= 1, head_need
;
1334 u16 ethertype
, hdrlen
, fc
;
1335 struct ieee80211_hdr hdr
;
1336 const u8
*encaps_data
;
1337 int encaps_len
, skip_header_bytes
;
1339 struct sta_info
*sta
;
1341 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1342 if (unlikely(skb
->len
< ETH_HLEN
)) {
1343 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1344 dev
->name
, skb
->len
);
1349 nh_pos
= skb_network_header(skb
) - skb
->data
;
1350 h_pos
= skb_transport_header(skb
) - skb
->data
;
1352 /* convert Ethernet header to proper 802.11 header (based on
1353 * operation mode) */
1354 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1355 /* TODO: handling for 802.1x authorized/unauthorized port */
1356 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1358 switch (sdata
->type
) {
1359 case IEEE80211_IF_TYPE_AP
:
1360 case IEEE80211_IF_TYPE_VLAN
:
1361 fc
|= IEEE80211_FCTL_FROMDS
;
1363 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1364 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1365 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1368 case IEEE80211_IF_TYPE_WDS
:
1369 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1371 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1372 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1373 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1374 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1377 case IEEE80211_IF_TYPE_STA
:
1378 fc
|= IEEE80211_FCTL_TODS
;
1380 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1381 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1382 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1385 case IEEE80211_IF_TYPE_IBSS
:
1387 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1388 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1389 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1397 /* receiver is QoS enabled, use a QoS type frame */
1398 sta
= sta_info_get(local
, hdr
.addr1
);
1400 if (sta
->flags
& WLAN_STA_WME
) {
1401 fc
|= IEEE80211_STYPE_QOS_DATA
;
1407 hdr
.frame_control
= cpu_to_le16(fc
);
1408 hdr
.duration_id
= 0;
1411 skip_header_bytes
= ETH_HLEN
;
1412 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1413 encaps_data
= bridge_tunnel_header
;
1414 encaps_len
= sizeof(bridge_tunnel_header
);
1415 skip_header_bytes
-= 2;
1416 } else if (ethertype
>= 0x600) {
1417 encaps_data
= rfc1042_header
;
1418 encaps_len
= sizeof(rfc1042_header
);
1419 skip_header_bytes
-= 2;
1425 skb_pull(skb
, skip_header_bytes
);
1426 nh_pos
-= skip_header_bytes
;
1427 h_pos
-= skip_header_bytes
;
1429 /* TODO: implement support for fragments so that there is no need to
1430 * reallocate and copy payload; it might be enough to support one
1431 * extra fragment that would be copied in the beginning of the frame
1432 * data.. anyway, it would be nice to include this into skb structure
1435 * There are few options for this:
1436 * use skb->cb as an extra space for 802.11 header
1437 * allocate new buffer if not enough headroom
1438 * make sure that there is enough headroom in every skb by increasing
1439 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1440 * alloc_skb() (net/core/skbuff.c)
1442 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1443 head_need
-= skb_headroom(skb
);
1445 /* We are going to modify skb data, so make a copy of it if happens to
1446 * be cloned. This could happen, e.g., with Linux bridge code passing
1447 * us broadcast frames. */
1449 if (head_need
> 0 || skb_cloned(skb
)) {
1451 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1452 "of headroom\n", dev
->name
, head_need
);
1455 if (skb_cloned(skb
))
1456 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1458 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1459 /* Since we have to reallocate the buffer, make sure that there
1460 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1461 * before payload and 12 after). */
1462 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1464 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1471 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1472 nh_pos
+= encaps_len
;
1473 h_pos
+= encaps_len
;
1476 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1477 __le16
*qos_control
;
1479 qos_control
= (__le16
*) skb_push(skb
, 2);
1480 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1482 * Maybe we could actually set some fields here, for now just
1483 * initialise to zero to indicate no special operation.
1487 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1492 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1493 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1494 pkt_data
->ifindex
= dev
->ifindex
;
1496 skb
->dev
= local
->mdev
;
1497 dev
->stats
.tx_packets
++;
1498 dev
->stats
.tx_bytes
+= skb
->len
;
1500 /* Update skb pointers to various headers since this modified frame
1501 * is going to go through Linux networking code that may potentially
1502 * need things like pointer to IP header. */
1503 skb_set_mac_header(skb
, 0);
1504 skb_set_network_header(skb
, nh_pos
);
1505 skb_set_transport_header(skb
, h_pos
);
1507 dev
->trans_start
= jiffies
;
1508 dev_queue_xmit(skb
);
1520 * This is the transmit routine for the 802.11 type interfaces
1521 * called by upper layers of the linux networking
1522 * stack when it has a frame to transmit
1524 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1526 struct ieee80211_sub_if_data
*sdata
;
1527 struct ieee80211_tx_packet_data
*pkt_data
;
1528 struct ieee80211_hdr
*hdr
;
1531 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1533 if (skb
->len
< 10) {
1538 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1539 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1546 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1547 fc
= le16_to_cpu(hdr
->frame_control
);
1549 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1550 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1551 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1553 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1554 skb
->dev
= sdata
->local
->mdev
;
1557 * We're using the protocol field of the the frame control header
1558 * to request TX callback for hostapd. BIT(1) is checked.
1560 if ((fc
& BIT(1)) == BIT(1)) {
1561 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1563 hdr
->frame_control
= cpu_to_le16(fc
);
1566 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1567 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1569 dev
->stats
.tx_packets
++;
1570 dev
->stats
.tx_bytes
+= skb
->len
;
1572 dev_queue_xmit(skb
);
1577 /* helper functions for pending packets for when queues are stopped */
1579 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1582 struct ieee80211_tx_stored_packet
*store
;
1584 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1585 if (!__ieee80211_queue_pending(local
, i
))
1587 store
= &local
->pending_packet
[i
];
1588 kfree_skb(store
->skb
);
1589 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1590 kfree_skb(store
->extra_frag
[j
]);
1591 kfree(store
->extra_frag
);
1592 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1596 void ieee80211_tx_pending(unsigned long data
)
1598 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1599 struct net_device
*dev
= local
->mdev
;
1600 struct ieee80211_tx_stored_packet
*store
;
1601 struct ieee80211_txrx_data tx
;
1602 int i
, ret
, reschedule
= 0;
1604 netif_tx_lock_bh(dev
);
1605 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1606 if (__ieee80211_queue_stopped(local
, i
))
1608 if (!__ieee80211_queue_pending(local
, i
)) {
1612 store
= &local
->pending_packet
[i
];
1613 tx
.u
.tx
.control
= &store
->control
;
1614 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1615 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1616 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1617 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1619 if (store
->last_frag_rate_ctrl_probe
)
1620 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1621 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1623 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1626 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1631 netif_tx_unlock_bh(dev
);
1633 if (!ieee80211_qdisc_installed(dev
)) {
1634 if (!__ieee80211_queue_stopped(local
, 0))
1635 netif_wake_queue(dev
);
1637 netif_schedule(dev
);
1641 /* functions for drivers to get certain frames */
1643 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1644 struct ieee80211_if_ap
*bss
,
1645 struct sk_buff
*skb
)
1649 int i
, have_bits
= 0, n1
, n2
;
1651 /* Generate bitmap for TIM only if there are any STAs in power save
1653 read_lock_bh(&local
->sta_lock
);
1654 if (atomic_read(&bss
->num_sta_ps
) > 0)
1655 /* in the hope that this is faster than
1656 * checking byte-for-byte */
1657 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1658 IEEE80211_MAX_AID
+1);
1660 if (bss
->dtim_count
== 0)
1661 bss
->dtim_count
= bss
->dtim_period
- 1;
1665 tim
= pos
= (u8
*) skb_put(skb
, 6);
1666 *pos
++ = WLAN_EID_TIM
;
1668 *pos
++ = bss
->dtim_count
;
1669 *pos
++ = bss
->dtim_period
;
1671 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1675 /* Find largest even number N1 so that bits numbered 1 through
1676 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1677 * (N2 + 1) x 8 through 2007 are 0. */
1679 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1686 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1693 /* Bitmap control */
1695 /* Part Virt Bitmap */
1696 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1698 tim
[1] = n2
- n1
+ 4;
1699 skb_put(skb
, n2
- n1
);
1701 *pos
++ = aid0
; /* Bitmap control */
1702 *pos
++ = 0; /* Part Virt Bitmap */
1704 read_unlock_bh(&local
->sta_lock
);
1707 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1708 struct ieee80211_tx_control
*control
)
1710 struct ieee80211_local
*local
= hw_to_local(hw
);
1711 struct sk_buff
*skb
;
1712 struct net_device
*bdev
;
1713 struct ieee80211_sub_if_data
*sdata
= NULL
;
1714 struct ieee80211_if_ap
*ap
= NULL
;
1715 struct ieee80211_rate
*rate
;
1716 struct rate_control_extra extra
;
1717 u8
*b_head
, *b_tail
;
1720 bdev
= dev_get_by_index(&init_net
, if_id
);
1722 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1727 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1729 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1730 if (net_ratelimit())
1731 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1732 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1733 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1737 /* Assume we are generating the normal beacon locally */
1738 b_head
= ap
->beacon_head
;
1739 b_tail
= ap
->beacon_tail
;
1740 bh_len
= ap
->beacon_head_len
;
1741 bt_len
= ap
->beacon_tail_len
;
1743 skb
= dev_alloc_skb(local
->tx_headroom
+
1744 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1748 skb_reserve(skb
, local
->tx_headroom
);
1749 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1751 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1753 ieee80211_beacon_add_tim(local
, ap
, skb
);
1756 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1760 memset(&extra
, 0, sizeof(extra
));
1761 extra
.mode
= local
->oper_hw_mode
;
1763 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1765 if (net_ratelimit()) {
1766 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1767 "found\n", wiphy_name(local
->hw
.wiphy
));
1774 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1775 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1776 rate
->val2
: rate
->val
;
1777 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1778 control
->power_level
= local
->hw
.conf
.power_level
;
1779 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1780 control
->retry_limit
= 1;
1781 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1787 EXPORT_SYMBOL(ieee80211_beacon_get
);
1789 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1790 const void *frame
, size_t frame_len
,
1791 const struct ieee80211_tx_control
*frame_txctl
,
1792 struct ieee80211_rts
*rts
)
1794 const struct ieee80211_hdr
*hdr
= frame
;
1797 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1798 rts
->frame_control
= cpu_to_le16(fctl
);
1799 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1800 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1801 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1803 EXPORT_SYMBOL(ieee80211_rts_get
);
1805 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1806 const void *frame
, size_t frame_len
,
1807 const struct ieee80211_tx_control
*frame_txctl
,
1808 struct ieee80211_cts
*cts
)
1810 const struct ieee80211_hdr
*hdr
= frame
;
1813 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1814 cts
->frame_control
= cpu_to_le16(fctl
);
1815 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1816 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1818 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1821 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1822 struct ieee80211_tx_control
*control
)
1824 struct ieee80211_local
*local
= hw_to_local(hw
);
1825 struct sk_buff
*skb
;
1826 struct sta_info
*sta
;
1827 ieee80211_tx_handler
*handler
;
1828 struct ieee80211_txrx_data tx
;
1829 ieee80211_txrx_result res
= TXRX_DROP
;
1830 struct net_device
*bdev
;
1831 struct ieee80211_sub_if_data
*sdata
;
1832 struct ieee80211_if_ap
*bss
= NULL
;
1834 bdev
= dev_get_by_index(&init_net
, if_id
);
1836 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1840 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1843 if (bss
->dtim_count
!= 0)
1844 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1845 memset(control
, 0, sizeof(*control
));
1847 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1850 local
->total_ps_buffered
--;
1852 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1853 struct ieee80211_hdr
*hdr
=
1854 (struct ieee80211_hdr
*) skb
->data
;
1855 /* more buffered multicast/broadcast frames ==> set
1856 * MoreData flag in IEEE 802.11 header to inform PS
1858 hdr
->frame_control
|=
1859 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1862 if (ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
) == 0)
1864 dev_kfree_skb_any(skb
);
1867 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1868 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1870 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1871 res
= (*handler
)(&tx
);
1872 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1876 skb
= tx
.skb
; /* handlers are allowed to change skb */
1878 if (res
== TXRX_DROP
) {
1879 I802_DEBUG_INC(local
->tx_handlers_drop
);
1882 } else if (res
== TXRX_QUEUED
) {
1883 I802_DEBUG_INC(local
->tx_handlers_queued
);
1892 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);