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/ieee80211_radiotap.h>
22 #include <net/cfg80211.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "ieee80211_led.h"
31 #include "ieee80211_rate.h"
33 #define IEEE80211_TX_OK 0
34 #define IEEE80211_TX_AGAIN 1
35 #define IEEE80211_TX_FRAG_AGAIN 2
39 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
40 struct ieee80211_hdr
*hdr
)
42 /* Set the sequence number for this frame. */
43 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
45 /* Increase the sequence number. */
46 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
49 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
50 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
51 const struct sk_buff
*skb
)
53 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
57 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
63 fc
= le16_to_cpu(hdr
->frame_control
);
64 hdrlen
= ieee80211_get_hdrlen(fc
);
65 if (hdrlen
> skb
->len
)
68 printk(" FC=0x%04x DUR=0x%04x",
69 fc
, le16_to_cpu(hdr
->duration_id
));
71 printk(" A1=" MAC_FMT
, MAC_ARG(hdr
->addr1
));
73 printk(" A2=" MAC_FMT
, MAC_ARG(hdr
->addr2
));
75 printk(" A3=" MAC_FMT
, MAC_ARG(hdr
->addr3
));
77 printk(" A4=" MAC_FMT
, MAC_ARG(hdr
->addr4
));
80 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
81 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
85 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
87 static u16
ieee80211_duration(struct ieee80211_txrx_data
*tx
, int group_addr
,
90 int rate
, mrate
, erp
, dur
, i
;
91 struct ieee80211_rate
*txrate
= tx
->u
.tx
.rate
;
92 struct ieee80211_local
*local
= tx
->local
;
93 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
95 erp
= txrate
->flags
& IEEE80211_RATE_ERP
;
98 * data and mgmt (except PS Poll):
100 * - during contention period:
101 * if addr1 is group address: 0
102 * if more fragments = 0 and addr1 is individual address: time to
103 * transmit one ACK plus SIFS
104 * if more fragments = 1 and addr1 is individual address: time to
105 * transmit next fragment plus 2 x ACK plus 3 x SIFS
108 * - control response frame (CTS or ACK) shall be transmitted using the
109 * same rate as the immediately previous frame in the frame exchange
110 * sequence, if this rate belongs to the PHY mandatory rates, or else
111 * at the highest possible rate belonging to the PHY rates in the
115 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
116 /* TODO: These control frames are not currently sent by
117 * 80211.o, but should they be implemented, this function
118 * needs to be updated to support duration field calculation.
120 * RTS: time needed to transmit pending data/mgmt frame plus
121 * one CTS frame plus one ACK frame plus 3 x SIFS
122 * CTS: duration of immediately previous RTS minus time
123 * required to transmit CTS and its SIFS
124 * ACK: 0 if immediately previous directed data/mgmt had
125 * more=0, with more=1 duration in ACK frame is duration
126 * from previous frame minus time needed to transmit ACK
128 * PS Poll: BIT(15) | BIT(14) | aid
134 if (0 /* FIX: data/mgmt during CFP */)
137 if (group_addr
) /* Group address as the destination - no ACK */
140 /* Individual destination address:
141 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
142 * CTS and ACK frames shall be transmitted using the highest rate in
143 * basic rate set that is less than or equal to the rate of the
144 * immediately previous frame and that is using the same modulation
145 * (CCK or OFDM). If no basic rate set matches with these requirements,
146 * the highest mandatory rate of the PHY that is less than or equal to
147 * the rate of the previous frame is used.
148 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
151 mrate
= 10; /* use 1 Mbps if everything fails */
152 for (i
= 0; i
< mode
->num_rates
; i
++) {
153 struct ieee80211_rate
*r
= &mode
->rates
[i
];
154 if (r
->rate
> txrate
->rate
)
157 if (IEEE80211_RATE_MODULATION(txrate
->flags
) !=
158 IEEE80211_RATE_MODULATION(r
->flags
))
161 if (r
->flags
& IEEE80211_RATE_BASIC
)
163 else if (r
->flags
& IEEE80211_RATE_MANDATORY
)
167 /* No matching basic rate found; use highest suitable mandatory
172 /* Time needed to transmit ACK
173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
174 * to closest integer */
176 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
177 tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
);
180 /* Frame is fragmented: duration increases with time needed to
181 * transmit next fragment plus ACK and 2 x SIFS. */
182 dur
*= 2; /* ACK + SIFS */
184 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
187 IEEE80211_SDATA_SHORT_PREAMBLE
);
193 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
196 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
199 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
202 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
205 static int inline is_ieee80211_device(struct net_device
*dev
,
206 struct net_device
*master
)
208 return (wdev_priv(dev
->ieee80211_ptr
) ==
209 wdev_priv(master
->ieee80211_ptr
));
214 static ieee80211_txrx_result
215 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
218 struct sk_buff
*skb
= tx
->skb
;
219 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
220 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
))
224 return TXRX_CONTINUE
;
226 if (unlikely(tx
->local
->sta_scanning
!= 0) &&
227 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
228 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
231 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
232 return TXRX_CONTINUE
;
234 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
236 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
237 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
238 tx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
239 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
240 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
241 printk(KERN_DEBUG
"%s: dropped data frame to not "
242 "associated station " MAC_FMT
"\n",
243 tx
->dev
->name
, MAC_ARG(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 printk(KERN_DEBUG
"%s: dropped frame to " MAC_FMT
265 " (unauthorized port)\n", tx
->dev
->name
,
266 MAC_ARG(hdr
->addr1
));
268 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unauth_port
);
272 return TXRX_CONTINUE
;
275 static ieee80211_txrx_result
276 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
278 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
280 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
281 ieee80211_include_sequence(tx
->sdata
, hdr
);
283 return TXRX_CONTINUE
;
286 /* This function is called whenever the AP is about to exceed the maximum limit
287 * of buffered frames for power saving STAs. This situation should not really
288 * happen often during normal operation, so dropping the oldest buffered packet
289 * from each queue should be OK to make some room for new frames. */
290 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
292 int total
= 0, purged
= 0;
294 struct ieee80211_sub_if_data
*sdata
;
295 struct sta_info
*sta
;
298 * virtual interfaces are protected by RCU
302 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
303 struct ieee80211_if_ap
*ap
;
304 if (sdata
->dev
== local
->mdev
||
305 sdata
->type
!= IEEE80211_IF_TYPE_AP
)
308 skb
= skb_dequeue(&ap
->ps_bc_buf
);
313 total
+= skb_queue_len(&ap
->ps_bc_buf
);
317 read_lock_bh(&local
->sta_lock
);
318 list_for_each_entry(sta
, &local
->sta_list
, list
) {
319 skb
= skb_dequeue(&sta
->ps_tx_buf
);
324 total
+= skb_queue_len(&sta
->ps_tx_buf
);
326 read_unlock_bh(&local
->sta_lock
);
328 local
->total_ps_buffered
= total
;
329 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
330 wiphy_name(local
->hw
.wiphy
), purged
);
333 static inline ieee80211_txrx_result
334 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
336 /* broadcast/multicast frame */
337 /* If any of the associated stations is in power save mode,
338 * the frame is buffered to be sent after DTIM beacon frame */
339 if ((tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) &&
340 tx
->sdata
->type
!= IEEE80211_IF_TYPE_WDS
&&
341 tx
->sdata
->bss
&& atomic_read(&tx
->sdata
->bss
->num_sta_ps
) &&
342 !(tx
->fc
& IEEE80211_FCTL_ORDER
)) {
343 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
344 purge_old_ps_buffers(tx
->local
);
345 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
347 if (net_ratelimit()) {
348 printk(KERN_DEBUG
"%s: BC TX buffer full - "
349 "dropping the oldest frame\n",
352 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
354 tx
->local
->total_ps_buffered
++;
355 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
359 return TXRX_CONTINUE
;
362 static inline ieee80211_txrx_result
363 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
365 struct sta_info
*sta
= tx
->sta
;
368 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
369 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
370 return TXRX_CONTINUE
;
372 if (unlikely((sta
->flags
& WLAN_STA_PS
) && !sta
->pspoll
)) {
373 struct ieee80211_tx_packet_data
*pkt_data
;
374 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
375 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS buffer (entries "
377 MAC_ARG(sta
->addr
), sta
->aid
,
378 skb_queue_len(&sta
->ps_tx_buf
));
379 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
380 sta
->flags
|= WLAN_STA_TIM
;
381 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
382 purge_old_ps_buffers(tx
->local
);
383 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
384 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
385 if (net_ratelimit()) {
386 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" TX "
387 "buffer full - dropping oldest frame\n",
388 tx
->dev
->name
, MAC_ARG(sta
->addr
));
392 tx
->local
->total_ps_buffered
++;
393 /* Queue frame to be sent after STA sends an PS Poll frame */
394 if (skb_queue_empty(&sta
->ps_tx_buf
)) {
395 if (tx
->local
->ops
->set_tim
)
396 tx
->local
->ops
->set_tim(local_to_hw(tx
->local
),
399 bss_tim_set(tx
->local
, tx
->sdata
->bss
, sta
->aid
);
401 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
402 pkt_data
->jiffies
= jiffies
;
403 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
406 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
407 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
408 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" in PS mode, but pspoll "
409 "set -> send frame\n", tx
->dev
->name
,
412 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
415 return TXRX_CONTINUE
;
419 static ieee80211_txrx_result
420 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
422 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
423 return TXRX_CONTINUE
;
425 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
426 return ieee80211_tx_h_unicast_ps_buf(tx
);
428 return ieee80211_tx_h_multicast_ps_buf(tx
);
434 static ieee80211_txrx_result
435 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
437 struct ieee80211_key
*key
;
439 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
441 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
443 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
445 else if (tx
->sdata
->drop_unencrypted
&&
446 !(tx
->sdata
->eapol
&& ieee80211_is_eapol(tx
->skb
))) {
447 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
451 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
455 tx
->key
->tx_rx_count
++;
456 /* TODO: add threshold stuff again */
459 return TXRX_CONTINUE
;
462 static ieee80211_txrx_result
463 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
465 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
466 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
467 struct sk_buff
**frags
, *first
, *frag
;
471 int frag_threshold
= tx
->local
->fragmentation_threshold
;
473 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
474 return TXRX_CONTINUE
;
478 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
479 payload_len
= first
->len
- hdrlen
;
480 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
481 num_fragm
= (payload_len
+ per_fragm
- 1) / per_fragm
;
483 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
487 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
488 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
489 pos
= first
->data
+ hdrlen
+ per_fragm
;
490 left
= payload_len
- per_fragm
;
491 for (i
= 0; i
< num_fragm
- 1; i
++) {
492 struct ieee80211_hdr
*fhdr
;
498 /* reserve enough extra head and tail room for possible
501 dev_alloc_skb(tx
->local
->tx_headroom
+
503 IEEE80211_ENCRYPT_HEADROOM
+
504 IEEE80211_ENCRYPT_TAILROOM
);
507 /* Make sure that all fragments use the same priority so
508 * that they end up using the same TX queue */
509 frag
->priority
= first
->priority
;
510 skb_reserve(frag
, tx
->local
->tx_headroom
+
511 IEEE80211_ENCRYPT_HEADROOM
);
512 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
513 memcpy(fhdr
, first
->data
, hdrlen
);
514 if (i
== num_fragm
- 2)
515 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
516 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
517 copylen
= left
> per_fragm
? per_fragm
: left
;
518 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
523 skb_trim(first
, hdrlen
+ per_fragm
);
525 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
526 tx
->u
.tx
.extra_frag
= frags
;
528 return TXRX_CONTINUE
;
531 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
533 for (i
= 0; i
< num_fragm
- 1; i
++)
535 dev_kfree_skb(frags
[i
]);
538 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
542 static ieee80211_txrx_result
543 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data
*tx
)
546 return TXRX_CONTINUE
;
548 switch (tx
->key
->conf
.alg
) {
550 return ieee80211_crypto_wep_encrypt(tx
);
552 return ieee80211_crypto_tkip_encrypt(tx
);
554 return ieee80211_crypto_ccmp_encrypt(tx
);
562 static ieee80211_txrx_result
563 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
565 struct rate_control_extra extra
;
567 if (likely(!tx
->u
.tx
.rate
)) {
568 memset(&extra
, 0, sizeof(extra
));
569 extra
.mode
= tx
->u
.tx
.mode
;
570 extra
.ethertype
= tx
->ethertype
;
572 tx
->u
.tx
.rate
= rate_control_get_rate(tx
->local
, tx
->dev
,
574 if (unlikely(extra
.probe
!= NULL
)) {
575 tx
->u
.tx
.control
->flags
|=
576 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
577 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
578 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
->val
;
579 tx
->u
.tx
.rate
= extra
.probe
;
581 tx
->u
.tx
.control
->alt_retry_rate
= -1;
586 tx
->u
.tx
.control
->alt_retry_rate
= -1;
588 if (tx
->u
.tx
.mode
->mode
== MODE_IEEE80211G
&&
589 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
590 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && extra
.nonerp
) {
591 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
593 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
595 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
596 tx
->u
.tx
.rate
= extra
.nonerp
;
597 tx
->u
.tx
.control
->rate
= extra
.nonerp
;
598 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
600 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
601 tx
->u
.tx
.control
->rate
= tx
->u
.tx
.rate
;
603 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val
;
605 return TXRX_CONTINUE
;
608 static ieee80211_txrx_result
609 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
611 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
612 u16 fc
= le16_to_cpu(hdr
->frame_control
);
614 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
615 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
617 if (!control
->retry_limit
) {
618 if (!is_multicast_ether_addr(hdr
->addr1
)) {
619 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
620 && tx
->local
->rts_threshold
<
621 IEEE80211_MAX_RTS_THRESHOLD
) {
623 IEEE80211_TXCTL_USE_RTS_CTS
;
625 IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
626 control
->retry_limit
=
627 tx
->local
->long_retry_limit
;
629 control
->retry_limit
=
630 tx
->local
->short_retry_limit
;
633 control
->retry_limit
= 1;
637 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
638 /* Do not use multiple retry rates when sending fragmented
640 * TODO: The last fragment could still use multiple retry
642 control
->alt_retry_rate
= -1;
645 /* Use CTS protection for unicast frames sent using extended rates if
646 * there are associated non-ERP stations and RTS/CTS is not configured
648 if (mode
->mode
== MODE_IEEE80211G
&&
649 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
) &&
650 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
651 (tx
->sdata
->flags
& IEEE80211_SDATA_USE_PROTECTION
) &&
652 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
653 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
655 /* Transmit data frames using short preambles if the driver supports
656 * short preambles at the selected rate and short preambles are
657 * available on the network at the current point in time. */
658 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
659 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_PREAMBLE2
) &&
660 (tx
->sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
661 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
662 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
->val2
;
665 /* Setup duration field for the first fragment of the frame. Duration
666 * for remaining fragments will be updated when they are being sent
667 * to low-level driver in ieee80211_tx(). */
668 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
669 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
670 tx
->u
.tx
.extra_frag
[0]->len
: 0);
671 hdr
->duration_id
= cpu_to_le16(dur
);
673 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
674 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
675 struct ieee80211_rate
*rate
;
677 /* Do not use multiple retry rates when using RTS/CTS */
678 control
->alt_retry_rate
= -1;
680 /* Use min(data rate, max base rate) as CTS/RTS rate */
681 rate
= tx
->u
.tx
.rate
;
682 while (rate
> mode
->rates
&&
683 !(rate
->flags
& IEEE80211_RATE_BASIC
))
686 control
->rts_cts_rate
= rate
->val
;
687 control
->rts_rate
= rate
;
691 tx
->sta
->tx_packets
++;
692 tx
->sta
->tx_fragments
++;
693 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
694 if (tx
->u
.tx
.extra_frag
) {
696 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
697 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
699 tx
->u
.tx
.extra_frag
[i
]->len
;
705 * Tell hardware to not encrypt when we had sw crypto.
706 * Because we use the same flag to internally indicate that
707 * no (software) encryption should be done, we have to set it
708 * after all crypto handlers.
710 if (tx
->key
&& !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
711 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
713 return TXRX_CONTINUE
;
716 static ieee80211_txrx_result
717 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
719 struct ieee80211_local
*local
= tx
->local
;
720 struct ieee80211_hw_mode
*mode
= tx
->u
.tx
.mode
;
721 struct sk_buff
*skb
= tx
->skb
;
722 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
723 u32 load
= 0, hdrtime
;
725 /* TODO: this could be part of tx_status handling, so that the number
726 * of retries would be known; TX rate should in that case be stored
727 * somewhere with the packet */
729 /* Estimate total channel use caused by this frame */
731 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
732 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
734 if (mode
->mode
== MODE_IEEE80211A
||
735 (mode
->mode
== MODE_IEEE80211G
&&
736 tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP
))
737 hdrtime
= CHAN_UTIL_HDR_SHORT
;
739 hdrtime
= CHAN_UTIL_HDR_LONG
;
742 if (!is_multicast_ether_addr(hdr
->addr1
))
745 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
747 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
750 load
+= skb
->len
* tx
->u
.tx
.rate
->rate_inv
;
752 if (tx
->u
.tx
.extra_frag
) {
754 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
756 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
761 /* Divide channel_use by 8 to avoid wrapping around the counter */
762 load
>>= CHAN_UTIL_SHIFT
;
763 local
->channel_use_raw
+= load
;
765 tx
->sta
->channel_use_raw
+= load
;
766 tx
->sdata
->channel_use_raw
+= load
;
768 return TXRX_CONTINUE
;
771 /* TODO: implement register/unregister functions for adding TX/RX handlers
772 * into ordered list */
774 ieee80211_tx_handler ieee80211_tx_handlers
[] =
776 ieee80211_tx_h_check_assoc
,
777 ieee80211_tx_h_sequence
,
778 ieee80211_tx_h_ps_buf
,
779 ieee80211_tx_h_select_key
,
780 ieee80211_tx_h_michael_mic_add
,
781 ieee80211_tx_h_fragment
,
782 ieee80211_tx_h_encrypt
,
783 ieee80211_tx_h_rate_ctrl
,
785 ieee80211_tx_h_load_stats
,
789 /* actual transmit path */
792 * deal with packet injection down monitor interface
793 * with Radiotap Header -- only called for monitor mode interface
795 static ieee80211_txrx_result
796 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data
*tx
,
800 * this is the moment to interpret and discard the radiotap header that
801 * must be at the start of the packet injected in Monitor mode
803 * Need to take some care with endian-ness since radiotap
804 * args are little-endian
807 struct ieee80211_radiotap_iterator iterator
;
808 struct ieee80211_radiotap_header
*rthdr
=
809 (struct ieee80211_radiotap_header
*) skb
->data
;
810 struct ieee80211_hw_mode
*mode
= tx
->local
->hw
.conf
.mode
;
811 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
812 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
814 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
815 tx
->flags
|= IEEE80211_TXRXD_TX_INJECTED
;
816 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
819 * for every radiotap entry that is present
820 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
821 * entries present, or -EINVAL on error)
827 ret
= ieee80211_radiotap_iterator_next(&iterator
);
832 /* see if this argument is something we can use */
833 switch (iterator
.this_arg_index
) {
835 * You must take care when dereferencing iterator.this_arg
836 * for multibyte types... the pointer is not aligned. Use
837 * get_unaligned((type *)iterator.this_arg) to dereference
838 * iterator.this_arg for type "type" safely on all arches.
840 case IEEE80211_RADIOTAP_RATE
:
842 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
843 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
845 target_rate
= (*iterator
.this_arg
) * 5;
846 for (i
= 0; i
< mode
->num_rates
; i
++) {
847 struct ieee80211_rate
*r
= &mode
->rates
[i
];
849 if (r
->rate
== target_rate
) {
856 case IEEE80211_RADIOTAP_ANTENNA
:
858 * radiotap uses 0 for 1st ant, mac80211 is 1 for
861 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
864 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
865 control
->power_level
= *iterator
.this_arg
;
868 case IEEE80211_RADIOTAP_FLAGS
:
869 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
871 * this indicates that the skb we have been
872 * handed has the 32-bit FCS CRC at the end...
873 * we should react to that by snipping it off
874 * because it will be recomputed and added
877 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
880 skb_trim(skb
, skb
->len
- FCS_LEN
);
882 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
884 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
885 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
886 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
890 * Please update the file
891 * Documentation/networking/mac80211-injection.txt
892 * when parsing new fields here.
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
;
916 static ieee80211_txrx_result
917 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
919 struct net_device
*dev
,
920 struct ieee80211_tx_control
*control
)
922 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
923 struct ieee80211_hdr
*hdr
;
924 struct ieee80211_sub_if_data
*sdata
;
925 ieee80211_txrx_result res
= TXRX_CONTINUE
;
929 memset(tx
, 0, sizeof(*tx
));
931 tx
->dev
= dev
; /* use original interface */
933 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
934 tx
->u
.tx
.control
= control
;
936 * Set this flag (used below to indicate "automatic fragmentation"),
937 * it will be cleared/left by radiotap as desired.
939 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
941 /* process and remove the injection radiotap header */
942 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
943 if (unlikely(sdata
->type
== IEEE80211_IF_TYPE_MNTR
)) {
944 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TXRX_DROP
)
948 * __ieee80211_parse_tx_radiotap has now removed
949 * the radiotap header that was present and pre-filled
950 * 'tx' with tx control information.
954 hdr
= (struct ieee80211_hdr
*) skb
->data
;
956 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
957 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
959 if (is_multicast_ether_addr(hdr
->addr1
)) {
960 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
961 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
963 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
964 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
967 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
968 if ((tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
969 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
970 !local
->ops
->set_frag_threshold
)
971 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
973 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
977 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
978 else if (tx
->sta
->clear_dst_mask
) {
979 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
980 tx
->sta
->clear_dst_mask
= 0;
983 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
984 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
985 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
986 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
988 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
993 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
996 * NB: @tx is uninitialised when passed in here
998 static int ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1000 struct net_device
*mdev
,
1001 struct ieee80211_tx_control
*control
)
1003 struct ieee80211_tx_packet_data
*pkt_data
;
1004 struct net_device
*dev
;
1006 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1007 dev
= dev_get_by_index(pkt_data
->ifindex
);
1008 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1014 /* initialises tx with control */
1015 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1019 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1020 struct ieee80211_txrx_data
*tx
)
1022 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1025 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1026 __ieee80211_queue_stopped(local
, 0)) {
1027 netif_stop_queue(local
->mdev
);
1028 return IEEE80211_TX_AGAIN
;
1031 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1032 "TX to low-level driver", skb
);
1033 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1035 return IEEE80211_TX_AGAIN
;
1036 local
->mdev
->trans_start
= jiffies
;
1037 ieee80211_led_tx(local
, 1);
1039 if (tx
->u
.tx
.extra_frag
) {
1040 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1041 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1042 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1043 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1044 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1045 if (!tx
->u
.tx
.extra_frag
[i
])
1047 if (__ieee80211_queue_stopped(local
, control
->queue
))
1048 return IEEE80211_TX_FRAG_AGAIN
;
1049 if (i
== tx
->u
.tx
.num_extra_frag
) {
1050 control
->tx_rate
= tx
->u
.tx
.last_frag_hwrate
;
1051 control
->rate
= tx
->u
.tx
.last_frag_rate
;
1052 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1054 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1057 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1060 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1061 "TX to low-level driver",
1062 tx
->u
.tx
.extra_frag
[i
]);
1063 ret
= local
->ops
->tx(local_to_hw(local
),
1064 tx
->u
.tx
.extra_frag
[i
],
1067 return IEEE80211_TX_FRAG_AGAIN
;
1068 local
->mdev
->trans_start
= jiffies
;
1069 ieee80211_led_tx(local
, 1);
1070 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1072 kfree(tx
->u
.tx
.extra_frag
);
1073 tx
->u
.tx
.extra_frag
= NULL
;
1075 return IEEE80211_TX_OK
;
1078 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1079 struct ieee80211_tx_control
*control
)
1081 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1082 struct sta_info
*sta
;
1083 ieee80211_tx_handler
*handler
;
1084 struct ieee80211_txrx_data tx
;
1085 ieee80211_txrx_result res
= TXRX_DROP
, res_prepare
;
1088 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1090 if (unlikely(skb
->len
< 10)) {
1095 /* initialises tx */
1096 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1098 if (res_prepare
== TXRX_DROP
) {
1104 * key references are protected using RCU and this requires that
1105 * we are in a read-site RCU section during receive processing
1110 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1112 for (handler
= local
->tx_handlers
; *handler
!= NULL
;
1114 res
= (*handler
)(&tx
);
1115 if (res
!= TXRX_CONTINUE
)
1119 skb
= tx
.skb
; /* handlers are allowed to change skb */
1124 if (unlikely(res
== TXRX_DROP
)) {
1125 I802_DEBUG_INC(local
->tx_handlers_drop
);
1129 if (unlikely(res
== TXRX_QUEUED
)) {
1130 I802_DEBUG_INC(local
->tx_handlers_queued
);
1135 if (tx
.u
.tx
.extra_frag
) {
1136 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1138 struct ieee80211_hdr
*hdr
=
1139 (struct ieee80211_hdr
*)
1140 tx
.u
.tx
.extra_frag
[i
]->data
;
1142 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1143 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1146 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1147 tx
.u
.tx
.last_frag_hwrate
= tx
.u
.tx
.rate
->val
;
1149 dur
= ieee80211_duration(&tx
, 0, next_len
);
1150 hdr
->duration_id
= cpu_to_le16(dur
);
1155 ret
= __ieee80211_tx(local
, skb
, &tx
);
1157 struct ieee80211_tx_stored_packet
*store
=
1158 &local
->pending_packet
[control
->queue
];
1160 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1162 set_bit(IEEE80211_LINK_STATE_PENDING
,
1163 &local
->state
[control
->queue
]);
1165 /* When the driver gets out of buffers during sending of
1166 * fragments and calls ieee80211_stop_queue, there is
1167 * a small window between IEEE80211_LINK_STATE_XOFF and
1168 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1169 * gets available in that window (i.e. driver calls
1170 * ieee80211_wake_queue), we would end up with ieee80211_tx
1171 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1172 * continuing transmitting here when that situation is
1173 * possible to have happened. */
1174 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1175 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1176 &local
->state
[control
->queue
]);
1179 memcpy(&store
->control
, control
,
1180 sizeof(struct ieee80211_tx_control
));
1182 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1183 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1184 store
->last_frag_hwrate
= tx
.u
.tx
.last_frag_hwrate
;
1185 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1186 store
->last_frag_rate_ctrl_probe
=
1187 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1195 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1196 if (tx
.u
.tx
.extra_frag
[i
])
1197 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1198 kfree(tx
.u
.tx
.extra_frag
);
1203 /* device xmit handlers */
1205 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1206 struct net_device
*dev
)
1208 struct ieee80211_tx_control control
;
1209 struct ieee80211_tx_packet_data
*pkt_data
;
1210 struct net_device
*odev
= NULL
;
1211 struct ieee80211_sub_if_data
*osdata
;
1216 * copy control out of the skb so other people can use skb->cb
1218 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1219 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1221 if (pkt_data
->ifindex
)
1222 odev
= dev_get_by_index(pkt_data
->ifindex
);
1223 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1227 if (unlikely(!odev
)) {
1228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1229 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1230 "originating device\n", dev
->name
);
1235 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1237 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1238 if (skb_headroom(skb
) < headroom
) {
1239 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1246 control
.ifindex
= odev
->ifindex
;
1247 control
.type
= osdata
->type
;
1248 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1249 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1250 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1251 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1252 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1253 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1254 control
.queue
= pkt_data
->queue
;
1256 ret
= ieee80211_tx(odev
, skb
, &control
);
1262 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1263 struct net_device
*dev
)
1265 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1266 struct ieee80211_tx_packet_data
*pkt_data
;
1267 struct ieee80211_radiotap_header
*prthdr
=
1268 (struct ieee80211_radiotap_header
*)skb
->data
;
1271 /* check for not even having the fixed radiotap header part */
1272 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1273 goto fail
; /* too short to be possibly valid */
1275 /* is it a header version we can trust to find length from? */
1276 if (unlikely(prthdr
->it_version
))
1277 goto fail
; /* only version 0 is supported */
1279 /* then there must be a radiotap header with a length we can use */
1280 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1282 /* does the skb contain enough to deliver on the alleged length? */
1283 if (unlikely(skb
->len
< len_rthdr
))
1284 goto fail
; /* skb too short for claimed rt header extent */
1286 skb
->dev
= local
->mdev
;
1288 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1289 memset(pkt_data
, 0, sizeof(*pkt_data
));
1290 /* needed because we set skb device to master */
1291 pkt_data
->ifindex
= dev
->ifindex
;
1293 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1296 * fix up the pointers accounting for the radiotap
1297 * header still being in there. We are being given
1298 * a precooked IEEE80211 header so no need for
1301 skb_set_mac_header(skb
, len_rthdr
);
1303 * these are just fixed to the end of the rt area since we
1304 * don't have any better information and at this point, nobody cares
1306 skb_set_network_header(skb
, len_rthdr
);
1307 skb_set_transport_header(skb
, len_rthdr
);
1309 /* pass the radiotap header up to the next stage intact */
1310 dev_queue_xmit(skb
);
1311 return NETDEV_TX_OK
;
1315 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1319 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1320 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1321 * @skb: packet to be sent
1322 * @dev: incoming interface
1324 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1325 * not be freed, and caller is responsible for either retrying later or freeing
1328 * This function takes in an Ethernet header and encapsulates it with suitable
1329 * IEEE 802.11 header based on which interface the packet is coming in. The
1330 * encapsulated packet will then be passed to master interface, wlan#.11, for
1331 * transmission (through low-level driver).
1333 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1334 struct net_device
*dev
)
1336 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1337 struct ieee80211_tx_packet_data
*pkt_data
;
1338 struct ieee80211_sub_if_data
*sdata
;
1339 int ret
= 1, head_need
;
1340 u16 ethertype
, hdrlen
, fc
;
1341 struct ieee80211_hdr hdr
;
1342 const u8
*encaps_data
;
1343 int encaps_len
, skip_header_bytes
;
1345 struct sta_info
*sta
;
1347 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1348 if (unlikely(skb
->len
< ETH_HLEN
)) {
1349 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1350 dev
->name
, skb
->len
);
1355 nh_pos
= skb_network_header(skb
) - skb
->data
;
1356 h_pos
= skb_transport_header(skb
) - skb
->data
;
1358 /* convert Ethernet header to proper 802.11 header (based on
1359 * operation mode) */
1360 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1361 /* TODO: handling for 802.1x authorized/unauthorized port */
1362 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1364 switch (sdata
->type
) {
1365 case IEEE80211_IF_TYPE_AP
:
1366 case IEEE80211_IF_TYPE_VLAN
:
1367 fc
|= IEEE80211_FCTL_FROMDS
;
1369 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1370 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1371 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1374 case IEEE80211_IF_TYPE_WDS
:
1375 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1377 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1378 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1379 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1380 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1383 case IEEE80211_IF_TYPE_STA
:
1384 fc
|= IEEE80211_FCTL_TODS
;
1386 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1387 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1388 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1391 case IEEE80211_IF_TYPE_IBSS
:
1393 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1394 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1395 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1403 /* receiver is QoS enabled, use a QoS type frame */
1404 sta
= sta_info_get(local
, hdr
.addr1
);
1406 if (sta
->flags
& WLAN_STA_WME
) {
1407 fc
|= IEEE80211_STYPE_QOS_DATA
;
1413 hdr
.frame_control
= cpu_to_le16(fc
);
1414 hdr
.duration_id
= 0;
1417 skip_header_bytes
= ETH_HLEN
;
1418 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1419 encaps_data
= bridge_tunnel_header
;
1420 encaps_len
= sizeof(bridge_tunnel_header
);
1421 skip_header_bytes
-= 2;
1422 } else if (ethertype
>= 0x600) {
1423 encaps_data
= rfc1042_header
;
1424 encaps_len
= sizeof(rfc1042_header
);
1425 skip_header_bytes
-= 2;
1431 skb_pull(skb
, skip_header_bytes
);
1432 nh_pos
-= skip_header_bytes
;
1433 h_pos
-= skip_header_bytes
;
1435 /* TODO: implement support for fragments so that there is no need to
1436 * reallocate and copy payload; it might be enough to support one
1437 * extra fragment that would be copied in the beginning of the frame
1438 * data.. anyway, it would be nice to include this into skb structure
1441 * There are few options for this:
1442 * use skb->cb as an extra space for 802.11 header
1443 * allocate new buffer if not enough headroom
1444 * make sure that there is enough headroom in every skb by increasing
1445 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1446 * alloc_skb() (net/core/skbuff.c)
1448 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1449 head_need
-= skb_headroom(skb
);
1451 /* We are going to modify skb data, so make a copy of it if happens to
1452 * be cloned. This could happen, e.g., with Linux bridge code passing
1453 * us broadcast frames. */
1455 if (head_need
> 0 || skb_cloned(skb
)) {
1457 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1458 "of headroom\n", dev
->name
, head_need
);
1461 if (skb_cloned(skb
))
1462 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1464 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1465 /* Since we have to reallocate the buffer, make sure that there
1466 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1467 * before payload and 12 after). */
1468 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1470 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1477 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1478 nh_pos
+= encaps_len
;
1479 h_pos
+= encaps_len
;
1482 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1483 __le16
*qos_control
;
1485 qos_control
= (__le16
*) skb_push(skb
, 2);
1486 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1488 * Maybe we could actually set some fields here, for now just
1489 * initialise to zero to indicate no special operation.
1493 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1498 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1499 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1500 pkt_data
->ifindex
= dev
->ifindex
;
1502 skb
->dev
= local
->mdev
;
1503 dev
->stats
.tx_packets
++;
1504 dev
->stats
.tx_bytes
+= skb
->len
;
1506 /* Update skb pointers to various headers since this modified frame
1507 * is going to go through Linux networking code that may potentially
1508 * need things like pointer to IP header. */
1509 skb_set_mac_header(skb
, 0);
1510 skb_set_network_header(skb
, nh_pos
);
1511 skb_set_transport_header(skb
, h_pos
);
1513 dev
->trans_start
= jiffies
;
1514 dev_queue_xmit(skb
);
1526 * This is the transmit routine for the 802.11 type interfaces
1527 * called by upper layers of the linux networking
1528 * stack when it has a frame to transmit
1530 int ieee80211_mgmt_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1532 struct ieee80211_sub_if_data
*sdata
;
1533 struct ieee80211_tx_packet_data
*pkt_data
;
1534 struct ieee80211_hdr
*hdr
;
1537 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1539 if (skb
->len
< 10) {
1544 if (skb_headroom(skb
) < sdata
->local
->tx_headroom
) {
1545 if (pskb_expand_head(skb
, sdata
->local
->tx_headroom
,
1552 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1553 fc
= le16_to_cpu(hdr
->frame_control
);
1555 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
1556 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1557 pkt_data
->ifindex
= sdata
->dev
->ifindex
;
1559 skb
->priority
= 20; /* use hardcoded priority for mgmt TX queue */
1560 skb
->dev
= sdata
->local
->mdev
;
1563 * We're using the protocol field of the the frame control header
1564 * to request TX callback for hostapd. BIT(1) is checked.
1566 if ((fc
& BIT(1)) == BIT(1)) {
1567 pkt_data
->flags
|= IEEE80211_TXPD_REQ_TX_STATUS
;
1569 hdr
->frame_control
= cpu_to_le16(fc
);
1572 if (!(fc
& IEEE80211_FCTL_PROTECTED
))
1573 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1575 dev
->stats
.tx_packets
++;
1576 dev
->stats
.tx_bytes
+= skb
->len
;
1578 dev_queue_xmit(skb
);
1583 /* helper functions for pending packets for when queues are stopped */
1585 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1588 struct ieee80211_tx_stored_packet
*store
;
1590 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1591 if (!__ieee80211_queue_pending(local
, i
))
1593 store
= &local
->pending_packet
[i
];
1594 kfree_skb(store
->skb
);
1595 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1596 kfree_skb(store
->extra_frag
[j
]);
1597 kfree(store
->extra_frag
);
1598 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1602 void ieee80211_tx_pending(unsigned long data
)
1604 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1605 struct net_device
*dev
= local
->mdev
;
1606 struct ieee80211_tx_stored_packet
*store
;
1607 struct ieee80211_txrx_data tx
;
1608 int i
, ret
, reschedule
= 0;
1610 netif_tx_lock_bh(dev
);
1611 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1612 if (__ieee80211_queue_stopped(local
, i
))
1614 if (!__ieee80211_queue_pending(local
, i
)) {
1618 store
= &local
->pending_packet
[i
];
1619 tx
.u
.tx
.control
= &store
->control
;
1620 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1621 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1622 tx
.u
.tx
.last_frag_hwrate
= store
->last_frag_hwrate
;
1623 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1625 if (store
->last_frag_rate_ctrl_probe
)
1626 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1627 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1629 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1632 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1637 netif_tx_unlock_bh(dev
);
1639 if (!ieee80211_qdisc_installed(dev
)) {
1640 if (!__ieee80211_queue_stopped(local
, 0))
1641 netif_wake_queue(dev
);
1643 netif_schedule(dev
);
1647 /* functions for drivers to get certain frames */
1649 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1650 struct ieee80211_if_ap
*bss
,
1651 struct sk_buff
*skb
)
1655 int i
, have_bits
= 0, n1
, n2
;
1657 /* Generate bitmap for TIM only if there are any STAs in power save
1659 read_lock_bh(&local
->sta_lock
);
1660 if (atomic_read(&bss
->num_sta_ps
) > 0)
1661 /* in the hope that this is faster than
1662 * checking byte-for-byte */
1663 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1664 IEEE80211_MAX_AID
+1);
1666 if (bss
->dtim_count
== 0)
1667 bss
->dtim_count
= bss
->dtim_period
- 1;
1671 tim
= pos
= (u8
*) skb_put(skb
, 6);
1672 *pos
++ = WLAN_EID_TIM
;
1674 *pos
++ = bss
->dtim_count
;
1675 *pos
++ = bss
->dtim_period
;
1677 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1681 /* Find largest even number N1 so that bits numbered 1 through
1682 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1683 * (N2 + 1) x 8 through 2007 are 0. */
1685 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1692 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1699 /* Bitmap control */
1701 /* Part Virt Bitmap */
1702 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1704 tim
[1] = n2
- n1
+ 4;
1705 skb_put(skb
, n2
- n1
);
1707 *pos
++ = aid0
; /* Bitmap control */
1708 *pos
++ = 0; /* Part Virt Bitmap */
1710 read_unlock_bh(&local
->sta_lock
);
1713 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
, int if_id
,
1714 struct ieee80211_tx_control
*control
)
1716 struct ieee80211_local
*local
= hw_to_local(hw
);
1717 struct sk_buff
*skb
;
1718 struct net_device
*bdev
;
1719 struct ieee80211_sub_if_data
*sdata
= NULL
;
1720 struct ieee80211_if_ap
*ap
= NULL
;
1721 struct ieee80211_rate
*rate
;
1722 struct rate_control_extra extra
;
1723 u8
*b_head
, *b_tail
;
1726 bdev
= dev_get_by_index(if_id
);
1728 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1733 if (!ap
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
||
1735 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1736 if (net_ratelimit())
1737 printk(KERN_DEBUG
"no beacon data avail for idx=%d "
1738 "(%s)\n", if_id
, bdev
? bdev
->name
: "N/A");
1739 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1743 /* Assume we are generating the normal beacon locally */
1744 b_head
= ap
->beacon_head
;
1745 b_tail
= ap
->beacon_tail
;
1746 bh_len
= ap
->beacon_head_len
;
1747 bt_len
= ap
->beacon_tail_len
;
1749 skb
= dev_alloc_skb(local
->tx_headroom
+
1750 bh_len
+ bt_len
+ 256 /* maximum TIM len */);
1754 skb_reserve(skb
, local
->tx_headroom
);
1755 memcpy(skb_put(skb
, bh_len
), b_head
, bh_len
);
1757 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1759 ieee80211_beacon_add_tim(local
, ap
, skb
);
1762 memcpy(skb_put(skb
, bt_len
), b_tail
, bt_len
);
1766 memset(&extra
, 0, sizeof(extra
));
1767 extra
.mode
= local
->oper_hw_mode
;
1769 rate
= rate_control_get_rate(local
, local
->mdev
, skb
, &extra
);
1771 if (net_ratelimit()) {
1772 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: no rate "
1773 "found\n", wiphy_name(local
->hw
.wiphy
));
1780 ((sdata
->flags
& IEEE80211_SDATA_SHORT_PREAMBLE
) &&
1781 (rate
->flags
& IEEE80211_RATE_PREAMBLE2
)) ?
1782 rate
->val2
: rate
->val
;
1783 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1784 control
->power_level
= local
->hw
.conf
.power_level
;
1785 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1786 control
->retry_limit
= 1;
1787 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1793 EXPORT_SYMBOL(ieee80211_beacon_get
);
1795 void ieee80211_rts_get(struct ieee80211_hw
*hw
, int if_id
,
1796 const void *frame
, size_t frame_len
,
1797 const struct ieee80211_tx_control
*frame_txctl
,
1798 struct ieee80211_rts
*rts
)
1800 const struct ieee80211_hdr
*hdr
= frame
;
1803 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1804 rts
->frame_control
= cpu_to_le16(fctl
);
1805 rts
->duration
= ieee80211_rts_duration(hw
, if_id
, frame_len
, frame_txctl
);
1806 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1807 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1809 EXPORT_SYMBOL(ieee80211_rts_get
);
1811 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, int if_id
,
1812 const void *frame
, size_t frame_len
,
1813 const struct ieee80211_tx_control
*frame_txctl
,
1814 struct ieee80211_cts
*cts
)
1816 const struct ieee80211_hdr
*hdr
= frame
;
1819 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1820 cts
->frame_control
= cpu_to_le16(fctl
);
1821 cts
->duration
= ieee80211_ctstoself_duration(hw
, if_id
, frame_len
, frame_txctl
);
1822 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1824 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1827 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
, int if_id
,
1828 struct ieee80211_tx_control
*control
)
1830 struct ieee80211_local
*local
= hw_to_local(hw
);
1831 struct sk_buff
*skb
;
1832 struct sta_info
*sta
;
1833 ieee80211_tx_handler
*handler
;
1834 struct ieee80211_txrx_data tx
;
1835 ieee80211_txrx_result res
= TXRX_DROP
;
1836 struct net_device
*bdev
;
1837 struct ieee80211_sub_if_data
*sdata
;
1838 struct ieee80211_if_ap
*bss
= NULL
;
1840 bdev
= dev_get_by_index(if_id
);
1842 sdata
= IEEE80211_DEV_TO_SUB_IF(bdev
);
1846 if (!bss
|| sdata
->type
!= IEEE80211_IF_TYPE_AP
|| !bss
->beacon_head
)
1849 if (bss
->dtim_count
!= 0)
1850 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1851 memset(control
, 0, sizeof(*control
));
1853 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1856 local
->total_ps_buffered
--;
1858 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1859 struct ieee80211_hdr
*hdr
=
1860 (struct ieee80211_hdr
*) skb
->data
;
1861 /* more buffered multicast/broadcast frames ==> set
1862 * MoreData flag in IEEE 802.11 header to inform PS
1864 hdr
->frame_control
|=
1865 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1868 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
))
1870 dev_kfree_skb_any(skb
);
1873 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1874 tx
.u
.tx
.mode
= local
->hw
.conf
.mode
;
1876 for (handler
= local
->tx_handlers
; *handler
!= NULL
; handler
++) {
1877 res
= (*handler
)(&tx
);
1878 if (res
== TXRX_DROP
|| res
== TXRX_QUEUED
)
1882 skb
= tx
.skb
; /* handlers are allowed to change skb */
1884 if (res
== TXRX_DROP
) {
1885 I802_DEBUG_INC(local
->tx_handlers_drop
);
1888 } else if (res
== TXRX_QUEUED
) {
1889 I802_DEBUG_INC(local
->tx_handlers_queued
);
1898 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);