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_supported_band
*sband
;
97 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
100 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
101 erp
= txrate
->flags
& IEEE80211_RATE_ERP_G
;
104 * data and mgmt (except PS Poll):
105 * - during CFP: 32768
106 * - during contention period:
107 * if addr1 is group address: 0
108 * if more fragments = 0 and addr1 is individual address: time to
109 * transmit one ACK plus SIFS
110 * if more fragments = 1 and addr1 is individual address: time to
111 * transmit next fragment plus 2 x ACK plus 3 x SIFS
114 * - control response frame (CTS or ACK) shall be transmitted using the
115 * same rate as the immediately previous frame in the frame exchange
116 * sequence, if this rate belongs to the PHY mandatory rates, or else
117 * at the highest possible rate belonging to the PHY rates in the
121 if ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
) {
122 /* TODO: These control frames are not currently sent by
123 * 80211.o, but should they be implemented, this function
124 * needs to be updated to support duration field calculation.
126 * RTS: time needed to transmit pending data/mgmt frame plus
127 * one CTS frame plus one ACK frame plus 3 x SIFS
128 * CTS: duration of immediately previous RTS minus time
129 * required to transmit CTS and its SIFS
130 * ACK: 0 if immediately previous directed data/mgmt had
131 * more=0, with more=1 duration in ACK frame is duration
132 * from previous frame minus time needed to transmit ACK
134 * PS Poll: BIT(15) | BIT(14) | aid
140 if (0 /* FIX: data/mgmt during CFP */)
143 if (group_addr
) /* Group address as the destination - no ACK */
146 /* Individual destination address:
147 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
148 * CTS and ACK frames shall be transmitted using the highest rate in
149 * basic rate set that is less than or equal to the rate of the
150 * immediately previous frame and that is using the same modulation
151 * (CCK or OFDM). If no basic rate set matches with these requirements,
152 * the highest mandatory rate of the PHY that is less than or equal to
153 * the rate of the previous frame is used.
154 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
157 /* use lowest available if everything fails */
158 mrate
= sband
->bitrates
[0].bitrate
;
159 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
160 struct ieee80211_rate
*r
= &sband
->bitrates
[i
];
162 if (r
->bitrate
> txrate
->bitrate
)
165 if (tx
->sdata
->basic_rates
& BIT(i
))
168 switch (sband
->band
) {
169 case IEEE80211_BAND_2GHZ
: {
171 if (tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
)
172 flag
= IEEE80211_RATE_MANDATORY_G
;
174 flag
= IEEE80211_RATE_MANDATORY_B
;
179 case IEEE80211_BAND_5GHZ
:
180 if (r
->flags
& IEEE80211_RATE_MANDATORY_A
)
183 case IEEE80211_NUM_BANDS
:
189 /* No matching basic rate found; use highest suitable mandatory
194 /* Time needed to transmit ACK
195 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
196 * to closest integer */
198 dur
= ieee80211_frame_duration(local
, 10, rate
, erp
,
199 tx
->sdata
->bss_conf
.use_short_preamble
);
202 /* Frame is fragmented: duration increases with time needed to
203 * transmit next fragment plus ACK and 2 x SIFS. */
204 dur
*= 2; /* ACK + SIFS */
206 dur
+= ieee80211_frame_duration(local
, next_frag_len
,
207 txrate
->bitrate
, erp
,
208 tx
->sdata
->bss_conf
.use_short_preamble
);
214 static inline int __ieee80211_queue_stopped(const struct ieee80211_local
*local
,
217 return test_bit(IEEE80211_LINK_STATE_XOFF
, &local
->state
[queue
]);
220 static inline int __ieee80211_queue_pending(const struct ieee80211_local
*local
,
223 return test_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[queue
]);
226 static int inline is_ieee80211_device(struct net_device
*dev
,
227 struct net_device
*master
)
229 return (wdev_priv(dev
->ieee80211_ptr
) ==
230 wdev_priv(master
->ieee80211_ptr
));
235 static ieee80211_tx_result
236 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data
*tx
)
238 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
239 struct sk_buff
*skb
= tx
->skb
;
240 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
241 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
244 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
))
247 if (unlikely(tx
->local
->sta_sw_scanning
) &&
248 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
249 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
252 if (tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
)
255 sta_flags
= tx
->sta
? tx
->sta
->flags
: 0;
257 if (likely(tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)) {
258 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
259 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
260 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
261 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
262 DECLARE_MAC_BUF(mac
);
263 printk(KERN_DEBUG
"%s: dropped data frame to not "
264 "associated station %s\n",
265 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
266 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
267 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
271 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
272 tx
->local
->num_sta
== 0 &&
273 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
)) {
275 * No associated STAs - no need to send multicast
286 static ieee80211_tx_result
287 ieee80211_tx_h_sequence(struct ieee80211_txrx_data
*tx
)
289 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
291 if (ieee80211_get_hdrlen(le16_to_cpu(hdr
->frame_control
)) >= 24)
292 ieee80211_include_sequence(tx
->sdata
, hdr
);
297 /* This function is called whenever the AP is about to exceed the maximum limit
298 * of buffered frames for power saving STAs. This situation should not really
299 * happen often during normal operation, so dropping the oldest buffered packet
300 * from each queue should be OK to make some room for new frames. */
301 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
303 int total
= 0, purged
= 0;
305 struct ieee80211_sub_if_data
*sdata
;
306 struct sta_info
*sta
;
309 * virtual interfaces are protected by RCU
313 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
314 struct ieee80211_if_ap
*ap
;
315 if (sdata
->dev
== local
->mdev
||
316 sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
)
319 skb
= skb_dequeue(&ap
->ps_bc_buf
);
324 total
+= skb_queue_len(&ap
->ps_bc_buf
);
328 read_lock_bh(&local
->sta_lock
);
329 list_for_each_entry(sta
, &local
->sta_list
, list
) {
330 skb
= skb_dequeue(&sta
->ps_tx_buf
);
335 total
+= skb_queue_len(&sta
->ps_tx_buf
);
337 read_unlock_bh(&local
->sta_lock
);
339 local
->total_ps_buffered
= total
;
340 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
341 wiphy_name(local
->hw
.wiphy
), purged
);
344 static ieee80211_tx_result
345 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data
*tx
)
348 * broadcast/multicast frame
350 * If any of the associated stations is in power save mode,
351 * the frame is buffered to be sent after DTIM beacon frame.
352 * This is done either by the hardware or us.
355 /* not AP/IBSS or ordered frame */
356 if (!tx
->sdata
->bss
|| (tx
->fc
& IEEE80211_FCTL_ORDER
))
359 /* no stations in PS mode */
360 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
363 /* buffered in mac80211 */
364 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
365 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
366 purge_old_ps_buffers(tx
->local
);
367 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
369 if (net_ratelimit()) {
370 printk(KERN_DEBUG
"%s: BC TX buffer full - "
371 "dropping the oldest frame\n",
374 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
376 tx
->local
->total_ps_buffered
++;
377 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
381 /* buffered in hardware */
382 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_SEND_AFTER_DTIM
;
387 static ieee80211_tx_result
388 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data
*tx
)
390 struct sta_info
*sta
= tx
->sta
;
391 DECLARE_MAC_BUF(mac
);
394 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
395 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
398 if (unlikely((sta
->flags
& WLAN_STA_PS
) &&
399 !(sta
->flags
& WLAN_STA_PSPOLL
))) {
400 struct ieee80211_tx_packet_data
*pkt_data
;
401 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
402 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
404 print_mac(mac
, sta
->addr
), sta
->aid
,
405 skb_queue_len(&sta
->ps_tx_buf
));
406 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
407 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
408 purge_old_ps_buffers(tx
->local
);
409 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
410 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
411 if (net_ratelimit()) {
412 printk(KERN_DEBUG
"%s: STA %s TX "
413 "buffer full - dropping oldest frame\n",
414 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
418 tx
->local
->total_ps_buffered
++;
420 /* Queue frame to be sent after STA sends an PS Poll frame */
421 if (skb_queue_empty(&sta
->ps_tx_buf
))
422 sta_info_set_tim_bit(sta
);
424 pkt_data
= (struct ieee80211_tx_packet_data
*)tx
->skb
->cb
;
425 pkt_data
->jiffies
= jiffies
;
426 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
429 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
430 else if (unlikely(sta
->flags
& WLAN_STA_PS
)) {
431 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
432 "set -> send frame\n", tx
->dev
->name
,
433 print_mac(mac
, sta
->addr
));
435 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
436 sta
->flags
&= ~WLAN_STA_PSPOLL
;
441 static ieee80211_tx_result
442 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data
*tx
)
444 if (unlikely(tx
->flags
& IEEE80211_TXRXD_TXPS_BUFFERED
))
447 if (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
)
448 return ieee80211_tx_h_unicast_ps_buf(tx
);
450 return ieee80211_tx_h_multicast_ps_buf(tx
);
453 static ieee80211_tx_result
454 ieee80211_tx_h_select_key(struct ieee80211_txrx_data
*tx
)
456 struct ieee80211_key
*key
;
459 if (unlikely(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_DO_NOT_ENCRYPT
))
461 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
463 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
465 else if (tx
->sdata
->drop_unencrypted
&&
466 !(tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_EAPOL_FRAME
) &&
467 !(tx
->flags
& IEEE80211_TXRXD_TX_INJECTED
)) {
468 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
476 tx
->key
->tx_rx_count
++;
477 /* TODO: add threshold stuff again */
479 switch (tx
->key
->conf
.alg
) {
481 ftype
= fc
& IEEE80211_FCTL_FTYPE
;
482 stype
= fc
& IEEE80211_FCTL_STYPE
;
484 if (ftype
== IEEE80211_FTYPE_MGMT
&&
485 stype
== IEEE80211_STYPE_AUTH
)
489 if (!WLAN_FC_DATA_PRESENT(fc
))
495 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
496 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
501 static ieee80211_tx_result
502 ieee80211_tx_h_fragment(struct ieee80211_txrx_data
*tx
)
504 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
505 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
506 struct sk_buff
**frags
, *first
, *frag
;
510 int frag_threshold
= tx
->local
->fragmentation_threshold
;
512 if (!(tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
))
517 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
518 payload_len
= first
->len
- hdrlen
;
519 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
520 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
522 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
526 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
527 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
528 pos
= first
->data
+ hdrlen
+ per_fragm
;
529 left
= payload_len
- per_fragm
;
530 for (i
= 0; i
< num_fragm
- 1; i
++) {
531 struct ieee80211_hdr
*fhdr
;
537 /* reserve enough extra head and tail room for possible
540 dev_alloc_skb(tx
->local
->tx_headroom
+
542 IEEE80211_ENCRYPT_HEADROOM
+
543 IEEE80211_ENCRYPT_TAILROOM
);
546 /* Make sure that all fragments use the same priority so
547 * that they end up using the same TX queue */
548 frag
->priority
= first
->priority
;
549 skb_reserve(frag
, tx
->local
->tx_headroom
+
550 IEEE80211_ENCRYPT_HEADROOM
);
551 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
552 memcpy(fhdr
, first
->data
, hdrlen
);
553 if (i
== num_fragm
- 2)
554 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
555 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
556 copylen
= left
> per_fragm
? per_fragm
: left
;
557 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
562 skb_trim(first
, hdrlen
+ per_fragm
);
564 tx
->u
.tx
.num_extra_frag
= num_fragm
- 1;
565 tx
->u
.tx
.extra_frag
= frags
;
570 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
572 for (i
= 0; i
< num_fragm
- 1; i
++)
574 dev_kfree_skb(frags
[i
]);
577 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
581 static ieee80211_tx_result
582 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data
*tx
)
587 switch (tx
->key
->conf
.alg
) {
589 return ieee80211_crypto_wep_encrypt(tx
);
591 return ieee80211_crypto_tkip_encrypt(tx
);
593 return ieee80211_crypto_ccmp_encrypt(tx
);
601 static ieee80211_tx_result
602 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data
*tx
)
604 struct rate_selection rsel
;
605 struct ieee80211_supported_band
*sband
;
607 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->local
->hw
.conf
.channel
->band
];
609 if (likely(!tx
->u
.tx
.rate
)) {
610 rate_control_get_rate(tx
->dev
, sband
, tx
->skb
, &rsel
);
611 tx
->u
.tx
.rate
= rsel
.rate
;
612 if (unlikely(rsel
.probe
)) {
613 tx
->u
.tx
.control
->flags
|=
614 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
615 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
616 tx
->u
.tx
.control
->alt_retry_rate
= tx
->u
.tx
.rate
;
617 tx
->u
.tx
.rate
= rsel
.probe
;
619 tx
->u
.tx
.control
->alt_retry_rate
= NULL
;
624 tx
->u
.tx
.control
->alt_retry_rate
= NULL
;
626 if (tx
->sdata
->bss_conf
.use_cts_prot
&&
627 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) && rsel
.nonerp
) {
628 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
630 tx
->flags
&= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
632 tx
->flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
633 tx
->u
.tx
.rate
= rsel
.nonerp
;
634 tx
->u
.tx
.control
->tx_rate
= rsel
.nonerp
;
635 tx
->u
.tx
.control
->flags
&= ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
637 tx
->u
.tx
.last_frag_rate
= tx
->u
.tx
.rate
;
638 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
;
640 tx
->u
.tx
.control
->tx_rate
= tx
->u
.tx
.rate
;
645 static ieee80211_tx_result
646 ieee80211_tx_h_misc(struct ieee80211_txrx_data
*tx
)
648 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) tx
->skb
->data
;
649 u16 fc
= le16_to_cpu(hdr
->frame_control
);
651 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
653 if (!control
->retry_limit
) {
654 if (!is_multicast_ether_addr(hdr
->addr1
)) {
655 if (tx
->skb
->len
+ FCS_LEN
> tx
->local
->rts_threshold
656 && tx
->local
->rts_threshold
<
657 IEEE80211_MAX_RTS_THRESHOLD
) {
659 IEEE80211_TXCTL_USE_RTS_CTS
;
661 IEEE80211_TXCTL_LONG_RETRY_LIMIT
;
662 control
->retry_limit
=
663 tx
->local
->long_retry_limit
;
665 control
->retry_limit
=
666 tx
->local
->short_retry_limit
;
669 control
->retry_limit
= 1;
673 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
674 /* Do not use multiple retry rates when sending fragmented
676 * TODO: The last fragment could still use multiple retry
678 control
->alt_retry_rate
= NULL
;
681 /* Use CTS protection for unicast frames sent using extended rates if
682 * there are associated non-ERP stations and RTS/CTS is not configured
684 if ((tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
) &&
685 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_ERP_G
) &&
686 (tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
687 tx
->sdata
->bss_conf
.use_cts_prot
&&
688 !(control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
))
689 control
->flags
|= IEEE80211_TXCTL_USE_CTS_PROTECT
;
691 /* Transmit data frames using short preambles if the driver supports
692 * short preambles at the selected rate and short preambles are
693 * available on the network at the current point in time. */
694 if (((fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
695 (tx
->u
.tx
.rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
) &&
696 tx
->sdata
->bss_conf
.use_short_preamble
&&
697 (!tx
->sta
|| (tx
->sta
->flags
& WLAN_STA_SHORT_PREAMBLE
))) {
698 tx
->u
.tx
.control
->flags
|= IEEE80211_TXCTL_SHORT_PREAMBLE
;
701 /* Setup duration field for the first fragment of the frame. Duration
702 * for remaining fragments will be updated when they are being sent
703 * to low-level driver in ieee80211_tx(). */
704 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
705 (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) ?
706 tx
->u
.tx
.extra_frag
[0]->len
: 0);
707 hdr
->duration_id
= cpu_to_le16(dur
);
709 if ((control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
) ||
710 (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)) {
711 struct ieee80211_supported_band
*sband
;
712 struct ieee80211_rate
*rate
, *baserate
;
715 sband
= tx
->local
->hw
.wiphy
->bands
[
716 tx
->local
->hw
.conf
.channel
->band
];
718 /* Do not use multiple retry rates when using RTS/CTS */
719 control
->alt_retry_rate
= NULL
;
721 /* Use min(data rate, max base rate) as CTS/RTS rate */
722 rate
= tx
->u
.tx
.rate
;
725 for (idx
= 0; idx
< sband
->n_bitrates
; idx
++) {
726 if (sband
->bitrates
[idx
].bitrate
> rate
->bitrate
)
728 if (tx
->sdata
->basic_rates
& BIT(idx
) &&
730 (baserate
->bitrate
< sband
->bitrates
[idx
].bitrate
)))
731 baserate
= &sband
->bitrates
[idx
];
735 control
->rts_cts_rate
= baserate
;
737 control
->rts_cts_rate
= &sband
->bitrates
[0];
741 tx
->sta
->tx_packets
++;
742 tx
->sta
->tx_fragments
++;
743 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
744 if (tx
->u
.tx
.extra_frag
) {
746 tx
->sta
->tx_fragments
+= tx
->u
.tx
.num_extra_frag
;
747 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
749 tx
->u
.tx
.extra_frag
[i
]->len
;
757 static ieee80211_tx_result
758 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data
*tx
)
760 struct ieee80211_local
*local
= tx
->local
;
761 struct sk_buff
*skb
= tx
->skb
;
762 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
763 u32 load
= 0, hdrtime
;
764 struct ieee80211_rate
*rate
= tx
->u
.tx
.rate
;
766 /* TODO: this could be part of tx_status handling, so that the number
767 * of retries would be known; TX rate should in that case be stored
768 * somewhere with the packet */
770 /* Estimate total channel use caused by this frame */
772 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
773 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
775 if (tx
->u
.tx
.channel
->band
== IEEE80211_BAND_5GHZ
||
776 (tx
->u
.tx
.channel
->band
== IEEE80211_BAND_2GHZ
&&
777 rate
->flags
& IEEE80211_RATE_ERP_G
))
778 hdrtime
= CHAN_UTIL_HDR_SHORT
;
780 hdrtime
= CHAN_UTIL_HDR_LONG
;
783 if (!is_multicast_ether_addr(hdr
->addr1
))
786 if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_RTS_CTS
)
788 else if (tx
->u
.tx
.control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
791 /* TODO: optimise again */
792 load
+= skb
->len
* CHAN_UTIL_RATE_LCM
/ rate
->bitrate
;
794 if (tx
->u
.tx
.extra_frag
) {
796 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
798 load
+= tx
->u
.tx
.extra_frag
[i
]->len
*
799 tx
->u
.tx
.rate
->bitrate
;
803 /* Divide channel_use by 8 to avoid wrapping around the counter */
804 load
>>= CHAN_UTIL_SHIFT
;
805 local
->channel_use_raw
+= load
;
807 tx
->sta
->channel_use_raw
+= load
;
808 tx
->sdata
->channel_use_raw
+= load
;
814 typedef ieee80211_tx_result (*ieee80211_tx_handler
)(struct ieee80211_txrx_data
*);
815 static ieee80211_tx_handler ieee80211_tx_handlers
[] =
817 ieee80211_tx_h_check_assoc
,
818 ieee80211_tx_h_sequence
,
819 ieee80211_tx_h_ps_buf
,
820 ieee80211_tx_h_select_key
,
821 ieee80211_tx_h_michael_mic_add
,
822 ieee80211_tx_h_fragment
,
823 ieee80211_tx_h_encrypt
,
824 ieee80211_tx_h_rate_ctrl
,
826 ieee80211_tx_h_load_stats
,
830 /* actual transmit path */
833 * deal with packet injection down monitor interface
834 * with Radiotap Header -- only called for monitor mode interface
836 static ieee80211_tx_result
837 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data
*tx
,
841 * this is the moment to interpret and discard the radiotap header that
842 * must be at the start of the packet injected in Monitor mode
844 * Need to take some care with endian-ness since radiotap
845 * args are little-endian
848 struct ieee80211_radiotap_iterator iterator
;
849 struct ieee80211_radiotap_header
*rthdr
=
850 (struct ieee80211_radiotap_header
*) skb
->data
;
851 struct ieee80211_supported_band
*sband
;
852 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
853 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
855 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->local
->hw
.conf
.channel
->band
];
857 control
->flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
858 tx
->flags
|= IEEE80211_TXRXD_TX_INJECTED
;
859 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
862 * for every radiotap entry that is present
863 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
864 * entries present, or -EINVAL on error)
870 ret
= ieee80211_radiotap_iterator_next(&iterator
);
875 /* see if this argument is something we can use */
876 switch (iterator
.this_arg_index
) {
878 * You must take care when dereferencing iterator.this_arg
879 * for multibyte types... the pointer is not aligned. Use
880 * get_unaligned((type *)iterator.this_arg) to dereference
881 * iterator.this_arg for type "type" safely on all arches.
883 case IEEE80211_RADIOTAP_RATE
:
885 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
886 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
888 target_rate
= (*iterator
.this_arg
) * 5;
889 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
890 struct ieee80211_rate
*r
;
892 r
= &sband
->bitrates
[i
];
894 if (r
->bitrate
== target_rate
) {
901 case IEEE80211_RADIOTAP_ANTENNA
:
903 * radiotap uses 0 for 1st ant, mac80211 is 1 for
906 control
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
910 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
911 control
->power_level
= *iterator
.this_arg
;
915 case IEEE80211_RADIOTAP_FLAGS
:
916 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
918 * this indicates that the skb we have been
919 * handed has the 32-bit FCS CRC at the end...
920 * we should react to that by snipping it off
921 * because it will be recomputed and added
924 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
927 skb_trim(skb
, skb
->len
- FCS_LEN
);
929 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
931 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
932 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
933 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
937 * Please update the file
938 * Documentation/networking/mac80211-injection.txt
939 * when parsing new fields here.
947 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
951 * remove the radiotap header
952 * iterator->max_length was sanity-checked against
953 * skb->len by iterator init
955 skb_pull(skb
, iterator
.max_length
);
963 static ieee80211_tx_result
964 __ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
966 struct net_device
*dev
,
967 struct ieee80211_tx_control
*control
)
969 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
970 struct ieee80211_hdr
*hdr
;
971 struct ieee80211_sub_if_data
*sdata
;
975 memset(tx
, 0, sizeof(*tx
));
977 tx
->dev
= dev
; /* use original interface */
979 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
980 tx
->u
.tx
.control
= control
;
982 * Set this flag (used below to indicate "automatic fragmentation"),
983 * it will be cleared/left by radiotap as desired.
985 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
987 /* process and remove the injection radiotap header */
988 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
989 if (unlikely(sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)) {
990 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
994 * __ieee80211_parse_tx_radiotap has now removed
995 * the radiotap header that was present and pre-filled
996 * 'tx' with tx control information.
1000 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1002 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
1003 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
1005 if (is_multicast_ether_addr(hdr
->addr1
)) {
1006 tx
->flags
&= ~IEEE80211_TXRXD_TXUNICAST
;
1007 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1009 tx
->flags
|= IEEE80211_TXRXD_TXUNICAST
;
1010 control
->flags
&= ~IEEE80211_TXCTL_NO_ACK
;
1013 if (tx
->flags
& IEEE80211_TXRXD_FRAGMENTED
) {
1014 if ((tx
->flags
& IEEE80211_TXRXD_TXUNICAST
) &&
1015 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
1016 !local
->ops
->set_frag_threshold
)
1017 tx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
1019 tx
->flags
&= ~IEEE80211_TXRXD_FRAGMENTED
;
1023 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1024 else if (tx
->sta
->clear_dst_mask
) {
1025 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1026 tx
->sta
->clear_dst_mask
= 0;
1029 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
1030 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
1031 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
1032 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
1034 control
->flags
|= IEEE80211_TXCTL_FIRST_FRAGMENT
;
1040 * NB: @tx is uninitialised when passed in here
1042 static int ieee80211_tx_prepare(struct ieee80211_txrx_data
*tx
,
1043 struct sk_buff
*skb
,
1044 struct net_device
*mdev
,
1045 struct ieee80211_tx_control
*control
)
1047 struct ieee80211_tx_packet_data
*pkt_data
;
1048 struct net_device
*dev
;
1050 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1051 dev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1052 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1058 /* initialises tx with control */
1059 __ieee80211_tx_prepare(tx
, skb
, dev
, control
);
1064 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1065 struct ieee80211_txrx_data
*tx
)
1067 struct ieee80211_tx_control
*control
= tx
->u
.tx
.control
;
1070 if (!ieee80211_qdisc_installed(local
->mdev
) &&
1071 __ieee80211_queue_stopped(local
, 0)) {
1072 netif_stop_queue(local
->mdev
);
1073 return IEEE80211_TX_AGAIN
;
1076 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1077 "TX to low-level driver", skb
);
1078 ret
= local
->ops
->tx(local_to_hw(local
), skb
, control
);
1080 return IEEE80211_TX_AGAIN
;
1081 local
->mdev
->trans_start
= jiffies
;
1082 ieee80211_led_tx(local
, 1);
1084 if (tx
->u
.tx
.extra_frag
) {
1085 control
->flags
&= ~(IEEE80211_TXCTL_USE_RTS_CTS
|
1086 IEEE80211_TXCTL_USE_CTS_PROTECT
|
1087 IEEE80211_TXCTL_CLEAR_DST_MASK
|
1088 IEEE80211_TXCTL_FIRST_FRAGMENT
);
1089 for (i
= 0; i
< tx
->u
.tx
.num_extra_frag
; i
++) {
1090 if (!tx
->u
.tx
.extra_frag
[i
])
1092 if (__ieee80211_queue_stopped(local
, control
->queue
))
1093 return IEEE80211_TX_FRAG_AGAIN
;
1094 if (i
== tx
->u
.tx
.num_extra_frag
) {
1095 control
->tx_rate
= tx
->u
.tx
.last_frag_rate
;
1097 if (tx
->flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
)
1099 IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1102 ~IEEE80211_TXCTL_RATE_CTRL_PROBE
;
1105 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1106 "TX to low-level driver",
1107 tx
->u
.tx
.extra_frag
[i
]);
1108 ret
= local
->ops
->tx(local_to_hw(local
),
1109 tx
->u
.tx
.extra_frag
[i
],
1112 return IEEE80211_TX_FRAG_AGAIN
;
1113 local
->mdev
->trans_start
= jiffies
;
1114 ieee80211_led_tx(local
, 1);
1115 tx
->u
.tx
.extra_frag
[i
] = NULL
;
1117 kfree(tx
->u
.tx
.extra_frag
);
1118 tx
->u
.tx
.extra_frag
= NULL
;
1120 return IEEE80211_TX_OK
;
1123 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
,
1124 struct ieee80211_tx_control
*control
)
1126 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1127 struct sta_info
*sta
;
1128 ieee80211_tx_handler
*handler
;
1129 struct ieee80211_txrx_data tx
;
1130 ieee80211_tx_result res
= TX_DROP
, res_prepare
;
1133 WARN_ON(__ieee80211_queue_pending(local
, control
->queue
));
1135 if (unlikely(skb
->len
< 10)) {
1140 /* initialises tx */
1141 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
, control
);
1143 if (res_prepare
== TX_DROP
) {
1149 * key references are protected using RCU and this requires that
1150 * we are in a read-site RCU section during receive processing
1155 tx
.u
.tx
.channel
= local
->hw
.conf
.channel
;
1157 for (handler
= ieee80211_tx_handlers
; *handler
!= NULL
;
1159 res
= (*handler
)(&tx
);
1160 if (res
!= TX_CONTINUE
)
1164 skb
= tx
.skb
; /* handlers are allowed to change skb */
1169 if (unlikely(res
== TX_DROP
)) {
1170 I802_DEBUG_INC(local
->tx_handlers_drop
);
1174 if (unlikely(res
== TX_QUEUED
)) {
1175 I802_DEBUG_INC(local
->tx_handlers_queued
);
1180 if (tx
.u
.tx
.extra_frag
) {
1181 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++) {
1183 struct ieee80211_hdr
*hdr
=
1184 (struct ieee80211_hdr
*)
1185 tx
.u
.tx
.extra_frag
[i
]->data
;
1187 if (i
+ 1 < tx
.u
.tx
.num_extra_frag
) {
1188 next_len
= tx
.u
.tx
.extra_frag
[i
+ 1]->len
;
1191 tx
.u
.tx
.rate
= tx
.u
.tx
.last_frag_rate
;
1193 dur
= ieee80211_duration(&tx
, 0, next_len
);
1194 hdr
->duration_id
= cpu_to_le16(dur
);
1199 ret
= __ieee80211_tx(local
, skb
, &tx
);
1201 struct ieee80211_tx_stored_packet
*store
=
1202 &local
->pending_packet
[control
->queue
];
1204 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1206 set_bit(IEEE80211_LINK_STATE_PENDING
,
1207 &local
->state
[control
->queue
]);
1209 /* When the driver gets out of buffers during sending of
1210 * fragments and calls ieee80211_stop_queue, there is
1211 * a small window between IEEE80211_LINK_STATE_XOFF and
1212 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1213 * gets available in that window (i.e. driver calls
1214 * ieee80211_wake_queue), we would end up with ieee80211_tx
1215 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1216 * continuing transmitting here when that situation is
1217 * possible to have happened. */
1218 if (!__ieee80211_queue_stopped(local
, control
->queue
)) {
1219 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1220 &local
->state
[control
->queue
]);
1223 memcpy(&store
->control
, control
,
1224 sizeof(struct ieee80211_tx_control
));
1226 store
->extra_frag
= tx
.u
.tx
.extra_frag
;
1227 store
->num_extra_frag
= tx
.u
.tx
.num_extra_frag
;
1228 store
->last_frag_rate
= tx
.u
.tx
.last_frag_rate
;
1229 store
->last_frag_rate_ctrl_probe
=
1230 !!(tx
.flags
& IEEE80211_TXRXD_TXPROBE_LAST_FRAG
);
1238 for (i
= 0; i
< tx
.u
.tx
.num_extra_frag
; i
++)
1239 if (tx
.u
.tx
.extra_frag
[i
])
1240 dev_kfree_skb(tx
.u
.tx
.extra_frag
[i
]);
1241 kfree(tx
.u
.tx
.extra_frag
);
1246 /* device xmit handlers */
1248 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1249 struct net_device
*dev
)
1251 struct ieee80211_tx_control control
;
1252 struct ieee80211_tx_packet_data
*pkt_data
;
1253 struct net_device
*odev
= NULL
;
1254 struct ieee80211_sub_if_data
*osdata
;
1259 * copy control out of the skb so other people can use skb->cb
1261 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1262 memset(&control
, 0, sizeof(struct ieee80211_tx_control
));
1264 if (pkt_data
->ifindex
)
1265 odev
= dev_get_by_index(&init_net
, pkt_data
->ifindex
);
1266 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1270 if (unlikely(!odev
)) {
1271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1272 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1273 "originating device\n", dev
->name
);
1278 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1280 headroom
= osdata
->local
->tx_headroom
+ IEEE80211_ENCRYPT_HEADROOM
;
1281 if (skb_headroom(skb
) < headroom
) {
1282 if (pskb_expand_head(skb
, headroom
, 0, GFP_ATOMIC
)) {
1289 control
.vif
= &osdata
->vif
;
1290 control
.type
= osdata
->vif
.type
;
1291 if (pkt_data
->flags
& IEEE80211_TXPD_REQ_TX_STATUS
)
1292 control
.flags
|= IEEE80211_TXCTL_REQ_TX_STATUS
;
1293 if (pkt_data
->flags
& IEEE80211_TXPD_DO_NOT_ENCRYPT
)
1294 control
.flags
|= IEEE80211_TXCTL_DO_NOT_ENCRYPT
;
1295 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
)
1296 control
.flags
|= IEEE80211_TXCTL_REQUEUE
;
1297 if (pkt_data
->flags
& IEEE80211_TXPD_EAPOL_FRAME
)
1298 control
.flags
|= IEEE80211_TXCTL_EAPOL_FRAME
;
1299 if (pkt_data
->flags
& IEEE80211_TXPD_AMPDU
)
1300 control
.flags
|= IEEE80211_TXCTL_AMPDU
;
1301 control
.queue
= pkt_data
->queue
;
1303 ret
= ieee80211_tx(odev
, skb
, &control
);
1309 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1310 struct net_device
*dev
)
1312 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1313 struct ieee80211_tx_packet_data
*pkt_data
;
1314 struct ieee80211_radiotap_header
*prthdr
=
1315 (struct ieee80211_radiotap_header
*)skb
->data
;
1318 /* check for not even having the fixed radiotap header part */
1319 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1320 goto fail
; /* too short to be possibly valid */
1322 /* is it a header version we can trust to find length from? */
1323 if (unlikely(prthdr
->it_version
))
1324 goto fail
; /* only version 0 is supported */
1326 /* then there must be a radiotap header with a length we can use */
1327 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1329 /* does the skb contain enough to deliver on the alleged length? */
1330 if (unlikely(skb
->len
< len_rthdr
))
1331 goto fail
; /* skb too short for claimed rt header extent */
1333 skb
->dev
= local
->mdev
;
1335 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1336 memset(pkt_data
, 0, sizeof(*pkt_data
));
1337 /* needed because we set skb device to master */
1338 pkt_data
->ifindex
= dev
->ifindex
;
1340 pkt_data
->flags
|= IEEE80211_TXPD_DO_NOT_ENCRYPT
;
1343 * fix up the pointers accounting for the radiotap
1344 * header still being in there. We are being given
1345 * a precooked IEEE80211 header so no need for
1348 skb_set_mac_header(skb
, len_rthdr
);
1350 * these are just fixed to the end of the rt area since we
1351 * don't have any better information and at this point, nobody cares
1353 skb_set_network_header(skb
, len_rthdr
);
1354 skb_set_transport_header(skb
, len_rthdr
);
1356 /* pass the radiotap header up to the next stage intact */
1357 dev_queue_xmit(skb
);
1358 return NETDEV_TX_OK
;
1362 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1366 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1367 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1368 * @skb: packet to be sent
1369 * @dev: incoming interface
1371 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1372 * not be freed, and caller is responsible for either retrying later or freeing
1375 * This function takes in an Ethernet header and encapsulates it with suitable
1376 * IEEE 802.11 header based on which interface the packet is coming in. The
1377 * encapsulated packet will then be passed to master interface, wlan#.11, for
1378 * transmission (through low-level driver).
1380 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1381 struct net_device
*dev
)
1383 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1384 struct ieee80211_tx_packet_data
*pkt_data
;
1385 struct ieee80211_sub_if_data
*sdata
;
1386 int ret
= 1, head_need
;
1387 u16 ethertype
, hdrlen
, fc
;
1388 struct ieee80211_hdr hdr
;
1389 const u8
*encaps_data
;
1390 int encaps_len
, skip_header_bytes
;
1392 struct sta_info
*sta
;
1395 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1396 if (unlikely(skb
->len
< ETH_HLEN
)) {
1397 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1398 dev
->name
, skb
->len
);
1403 nh_pos
= skb_network_header(skb
) - skb
->data
;
1404 h_pos
= skb_transport_header(skb
) - skb
->data
;
1406 /* convert Ethernet header to proper 802.11 header (based on
1407 * operation mode) */
1408 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1409 fc
= IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
;
1411 switch (sdata
->vif
.type
) {
1412 case IEEE80211_IF_TYPE_AP
:
1413 case IEEE80211_IF_TYPE_VLAN
:
1414 fc
|= IEEE80211_FCTL_FROMDS
;
1416 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1417 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1418 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1421 case IEEE80211_IF_TYPE_WDS
:
1422 fc
|= IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
;
1424 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1425 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1426 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1427 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1430 case IEEE80211_IF_TYPE_STA
:
1431 fc
|= IEEE80211_FCTL_TODS
;
1433 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1434 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1435 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1438 case IEEE80211_IF_TYPE_IBSS
:
1440 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1441 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1442 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1451 * There's no need to try to look up the destination
1452 * if it is a multicast address (which can only happen
1455 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1456 sta
= sta_info_get(local
, hdr
.addr1
);
1458 sta_flags
= sta
->flags
;
1463 /* receiver is QoS enabled, use a QoS type frame */
1464 if (sta_flags
& WLAN_STA_WME
) {
1465 fc
|= IEEE80211_STYPE_QOS_DATA
;
1470 * Drop unicast frames to unauthorised stations unless they are
1471 * EAPOL frames from the local station.
1473 if (unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1474 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1475 !(ethertype
== ETH_P_PAE
&&
1476 compare_ether_addr(dev
->dev_addr
,
1477 skb
->data
+ ETH_ALEN
) == 0))) {
1478 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1479 DECLARE_MAC_BUF(mac
);
1481 if (net_ratelimit())
1482 printk(KERN_DEBUG
"%s: dropped frame to %s"
1483 " (unauthorized port)\n", dev
->name
,
1484 print_mac(mac
, hdr
.addr1
));
1487 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1493 hdr
.frame_control
= cpu_to_le16(fc
);
1494 hdr
.duration_id
= 0;
1497 skip_header_bytes
= ETH_HLEN
;
1498 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1499 encaps_data
= bridge_tunnel_header
;
1500 encaps_len
= sizeof(bridge_tunnel_header
);
1501 skip_header_bytes
-= 2;
1502 } else if (ethertype
>= 0x600) {
1503 encaps_data
= rfc1042_header
;
1504 encaps_len
= sizeof(rfc1042_header
);
1505 skip_header_bytes
-= 2;
1511 skb_pull(skb
, skip_header_bytes
);
1512 nh_pos
-= skip_header_bytes
;
1513 h_pos
-= skip_header_bytes
;
1515 /* TODO: implement support for fragments so that there is no need to
1516 * reallocate and copy payload; it might be enough to support one
1517 * extra fragment that would be copied in the beginning of the frame
1518 * data.. anyway, it would be nice to include this into skb structure
1521 * There are few options for this:
1522 * use skb->cb as an extra space for 802.11 header
1523 * allocate new buffer if not enough headroom
1524 * make sure that there is enough headroom in every skb by increasing
1525 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1526 * alloc_skb() (net/core/skbuff.c)
1528 head_need
= hdrlen
+ encaps_len
+ local
->tx_headroom
;
1529 head_need
-= skb_headroom(skb
);
1531 /* We are going to modify skb data, so make a copy of it if happens to
1532 * be cloned. This could happen, e.g., with Linux bridge code passing
1533 * us broadcast frames. */
1535 if (head_need
> 0 || skb_cloned(skb
)) {
1537 printk(KERN_DEBUG
"%s: need to reallocate buffer for %d bytes "
1538 "of headroom\n", dev
->name
, head_need
);
1541 if (skb_cloned(skb
))
1542 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1544 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1545 /* Since we have to reallocate the buffer, make sure that there
1546 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1547 * before payload and 12 after). */
1548 if (pskb_expand_head(skb
, (head_need
> 0 ? head_need
+ 8 : 8),
1550 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer"
1557 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1558 nh_pos
+= encaps_len
;
1559 h_pos
+= encaps_len
;
1562 if (fc
& IEEE80211_STYPE_QOS_DATA
) {
1563 __le16
*qos_control
;
1565 qos_control
= (__le16
*) skb_push(skb
, 2);
1566 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1568 * Maybe we could actually set some fields here, for now just
1569 * initialise to zero to indicate no special operation.
1573 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1578 pkt_data
= (struct ieee80211_tx_packet_data
*)skb
->cb
;
1579 memset(pkt_data
, 0, sizeof(struct ieee80211_tx_packet_data
));
1580 pkt_data
->ifindex
= dev
->ifindex
;
1581 if (ethertype
== ETH_P_PAE
)
1582 pkt_data
->flags
|= IEEE80211_TXPD_EAPOL_FRAME
;
1584 skb
->dev
= local
->mdev
;
1585 dev
->stats
.tx_packets
++;
1586 dev
->stats
.tx_bytes
+= skb
->len
;
1588 /* Update skb pointers to various headers since this modified frame
1589 * is going to go through Linux networking code that may potentially
1590 * need things like pointer to IP header. */
1591 skb_set_mac_header(skb
, 0);
1592 skb_set_network_header(skb
, nh_pos
);
1593 skb_set_transport_header(skb
, h_pos
);
1595 dev
->trans_start
= jiffies
;
1596 dev_queue_xmit(skb
);
1607 /* helper functions for pending packets for when queues are stopped */
1609 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1612 struct ieee80211_tx_stored_packet
*store
;
1614 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1615 if (!__ieee80211_queue_pending(local
, i
))
1617 store
= &local
->pending_packet
[i
];
1618 kfree_skb(store
->skb
);
1619 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1620 kfree_skb(store
->extra_frag
[j
]);
1621 kfree(store
->extra_frag
);
1622 clear_bit(IEEE80211_LINK_STATE_PENDING
, &local
->state
[i
]);
1626 void ieee80211_tx_pending(unsigned long data
)
1628 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1629 struct net_device
*dev
= local
->mdev
;
1630 struct ieee80211_tx_stored_packet
*store
;
1631 struct ieee80211_txrx_data tx
;
1632 int i
, ret
, reschedule
= 0;
1634 netif_tx_lock_bh(dev
);
1635 for (i
= 0; i
< local
->hw
.queues
; i
++) {
1636 if (__ieee80211_queue_stopped(local
, i
))
1638 if (!__ieee80211_queue_pending(local
, i
)) {
1642 store
= &local
->pending_packet
[i
];
1643 tx
.u
.tx
.control
= &store
->control
;
1644 tx
.u
.tx
.extra_frag
= store
->extra_frag
;
1645 tx
.u
.tx
.num_extra_frag
= store
->num_extra_frag
;
1646 tx
.u
.tx
.last_frag_rate
= store
->last_frag_rate
;
1648 if (store
->last_frag_rate_ctrl_probe
)
1649 tx
.flags
|= IEEE80211_TXRXD_TXPROBE_LAST_FRAG
;
1650 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1652 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1655 clear_bit(IEEE80211_LINK_STATE_PENDING
,
1660 netif_tx_unlock_bh(dev
);
1662 if (!ieee80211_qdisc_installed(dev
)) {
1663 if (!__ieee80211_queue_stopped(local
, 0))
1664 netif_wake_queue(dev
);
1666 netif_schedule(dev
);
1670 /* functions for drivers to get certain frames */
1672 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1673 struct ieee80211_if_ap
*bss
,
1674 struct sk_buff
*skb
,
1675 struct beacon_data
*beacon
)
1679 int i
, have_bits
= 0, n1
, n2
;
1681 /* Generate bitmap for TIM only if there are any STAs in power save
1683 read_lock_bh(&local
->sta_lock
);
1684 if (atomic_read(&bss
->num_sta_ps
) > 0)
1685 /* in the hope that this is faster than
1686 * checking byte-for-byte */
1687 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1688 IEEE80211_MAX_AID
+1);
1690 if (bss
->dtim_count
== 0)
1691 bss
->dtim_count
= beacon
->dtim_period
- 1;
1695 tim
= pos
= (u8
*) skb_put(skb
, 6);
1696 *pos
++ = WLAN_EID_TIM
;
1698 *pos
++ = bss
->dtim_count
;
1699 *pos
++ = beacon
->dtim_period
;
1701 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1705 /* Find largest even number N1 so that bits numbered 1 through
1706 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1707 * (N2 + 1) x 8 through 2007 are 0. */
1709 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1716 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1723 /* Bitmap control */
1725 /* Part Virt Bitmap */
1726 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1728 tim
[1] = n2
- n1
+ 4;
1729 skb_put(skb
, n2
- n1
);
1731 *pos
++ = aid0
; /* Bitmap control */
1732 *pos
++ = 0; /* Part Virt Bitmap */
1734 read_unlock_bh(&local
->sta_lock
);
1737 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1738 struct ieee80211_vif
*vif
,
1739 struct ieee80211_tx_control
*control
)
1741 struct ieee80211_local
*local
= hw_to_local(hw
);
1742 struct sk_buff
*skb
;
1743 struct net_device
*bdev
;
1744 struct ieee80211_sub_if_data
*sdata
= NULL
;
1745 struct ieee80211_if_ap
*ap
= NULL
;
1746 struct rate_selection rsel
;
1747 struct beacon_data
*beacon
;
1748 struct ieee80211_supported_band
*sband
;
1750 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
1754 sdata
= vif_to_sdata(vif
);
1758 beacon
= rcu_dereference(ap
->beacon
);
1760 if (!ap
|| sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
) {
1761 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1762 if (net_ratelimit())
1763 printk(KERN_DEBUG
"no beacon data avail for %s\n",
1765 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1770 /* headroom, head length, tail length and maximum TIM length */
1771 skb
= dev_alloc_skb(local
->tx_headroom
+ beacon
->head_len
+
1772 beacon
->tail_len
+ 256);
1776 skb_reserve(skb
, local
->tx_headroom
);
1777 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1780 ieee80211_include_sequence(sdata
, (struct ieee80211_hdr
*)skb
->data
);
1782 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1785 memcpy(skb_put(skb
, beacon
->tail_len
), beacon
->tail
,
1789 rate_control_get_rate(local
->mdev
, sband
, skb
, &rsel
);
1791 if (net_ratelimit()) {
1792 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1794 wiphy_name(local
->hw
.wiphy
));
1802 control
->tx_rate
= rsel
.rate
;
1803 if (sdata
->bss_conf
.use_short_preamble
&&
1804 rsel
.rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
1805 control
->flags
|= IEEE80211_TXCTL_SHORT_PREAMBLE
;
1806 control
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1807 control
->flags
|= IEEE80211_TXCTL_NO_ACK
;
1808 control
->retry_limit
= 1;
1809 control
->flags
|= IEEE80211_TXCTL_CLEAR_DST_MASK
;
1818 EXPORT_SYMBOL(ieee80211_beacon_get
);
1820 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1821 const void *frame
, size_t frame_len
,
1822 const struct ieee80211_tx_control
*frame_txctl
,
1823 struct ieee80211_rts
*rts
)
1825 const struct ieee80211_hdr
*hdr
= frame
;
1828 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
;
1829 rts
->frame_control
= cpu_to_le16(fctl
);
1830 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1832 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1833 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1835 EXPORT_SYMBOL(ieee80211_rts_get
);
1837 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1838 const void *frame
, size_t frame_len
,
1839 const struct ieee80211_tx_control
*frame_txctl
,
1840 struct ieee80211_cts
*cts
)
1842 const struct ieee80211_hdr
*hdr
= frame
;
1845 fctl
= IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
;
1846 cts
->frame_control
= cpu_to_le16(fctl
);
1847 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
1848 frame_len
, frame_txctl
);
1849 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1851 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1854 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
1855 struct ieee80211_vif
*vif
,
1856 struct ieee80211_tx_control
*control
)
1858 struct ieee80211_local
*local
= hw_to_local(hw
);
1859 struct sk_buff
*skb
;
1860 struct sta_info
*sta
;
1861 ieee80211_tx_handler
*handler
;
1862 struct ieee80211_txrx_data tx
;
1863 ieee80211_tx_result res
= TX_DROP
;
1864 struct net_device
*bdev
;
1865 struct ieee80211_sub_if_data
*sdata
;
1866 struct ieee80211_if_ap
*bss
= NULL
;
1867 struct beacon_data
*beacon
;
1869 sdata
= vif_to_sdata(vif
);
1877 beacon
= rcu_dereference(bss
->beacon
);
1879 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
||
1886 if (bss
->dtim_count
!= 0)
1887 return NULL
; /* send buffered bc/mc only after DTIM beacon */
1888 memset(control
, 0, sizeof(*control
));
1890 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1893 local
->total_ps_buffered
--;
1895 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1896 struct ieee80211_hdr
*hdr
=
1897 (struct ieee80211_hdr
*) skb
->data
;
1898 /* more buffered multicast/broadcast frames ==> set
1899 * MoreData flag in IEEE 802.11 header to inform PS
1901 hdr
->frame_control
|=
1902 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1905 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
, control
))
1907 dev_kfree_skb_any(skb
);
1910 tx
.flags
|= IEEE80211_TXRXD_TXPS_BUFFERED
;
1911 tx
.u
.tx
.channel
= local
->hw
.conf
.channel
;
1913 for (handler
= ieee80211_tx_handlers
; *handler
!= NULL
; handler
++) {
1914 res
= (*handler
)(&tx
);
1915 if (res
== TX_DROP
|| res
== TX_QUEUED
)
1918 skb
= tx
.skb
; /* handlers are allowed to change skb */
1920 if (res
== TX_DROP
) {
1921 I802_DEBUG_INC(local
->tx_handlers_drop
);
1924 } else if (res
== TX_QUEUED
) {
1925 I802_DEBUG_INC(local
->tx_handlers_queued
);
1934 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);