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"
35 #define IEEE80211_TX_OK 0
36 #define IEEE80211_TX_AGAIN 1
37 #define IEEE80211_TX_FRAG_AGAIN 2
41 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data
*sdata
,
42 struct ieee80211_hdr
*hdr
)
44 /* Set the sequence number for this frame. */
45 hdr
->seq_ctrl
= cpu_to_le16(sdata
->sequence
);
47 /* Increase the sequence number. */
48 sdata
->sequence
= (sdata
->sequence
+ 0x10) & IEEE80211_SCTL_SEQ
;
51 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
52 static void ieee80211_dump_frame(const char *ifname
, const char *title
,
53 const struct sk_buff
*skb
)
55 const struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
59 printk(KERN_DEBUG
"%s: %s (len=%d)", ifname
, title
, skb
->len
);
65 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
66 if (hdrlen
> skb
->len
)
69 printk(" FC=0x%04x DUR=0x%04x",
70 le16_to_cpu(hdr
->frame_control
), le16_to_cpu(hdr
->duration_id
));
72 printk(" A1=%s", print_mac(mac
, hdr
->addr1
));
74 printk(" A2=%s", print_mac(mac
, hdr
->addr2
));
76 printk(" A3=%s", print_mac(mac
, hdr
->addr3
));
78 printk(" A4=%s", print_mac(mac
, hdr
->addr4
));
81 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
82 static inline void ieee80211_dump_frame(const char *ifname
, const char *title
,
86 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
88 static u16
ieee80211_duration(struct ieee80211_tx_data
*tx
, int group_addr
,
91 int rate
, mrate
, erp
, dur
, i
;
92 struct ieee80211_rate
*txrate
;
93 struct ieee80211_local
*local
= tx
->local
;
94 struct ieee80211_supported_band
*sband
;
96 sband
= local
->hw
.wiphy
->bands
[tx
->channel
->band
];
97 txrate
= &sband
->bitrates
[tx
->rate_idx
];
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 int inline is_ieee80211_device(struct net_device
*dev
,
215 struct net_device
*master
)
217 return (wdev_priv(dev
->ieee80211_ptr
) ==
218 wdev_priv(master
->ieee80211_ptr
));
223 static ieee80211_tx_result
224 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data
*tx
)
226 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
227 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
228 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
229 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
232 if (unlikely(info
->flags
& IEEE80211_TX_CTL_INJECTED
))
235 if (unlikely(tx
->local
->sta_sw_scanning
) &&
236 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
237 (tx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PROBE_REQ
))
240 if (tx
->sdata
->vif
.type
== IEEE80211_IF_TYPE_MESH_POINT
)
243 if (tx
->flags
& IEEE80211_TX_PS_BUFFERED
)
246 sta_flags
= tx
->sta
? get_sta_flags(tx
->sta
) : 0;
248 if (likely(tx
->flags
& IEEE80211_TX_UNICAST
)) {
249 if (unlikely(!(sta_flags
& WLAN_STA_ASSOC
) &&
250 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
251 (tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)) {
252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
253 DECLARE_MAC_BUF(mac
);
254 printk(KERN_DEBUG
"%s: dropped data frame to not "
255 "associated station %s\n",
256 tx
->dev
->name
, print_mac(mac
, hdr
->addr1
));
257 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
258 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_not_assoc
);
262 if (unlikely((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
263 tx
->local
->num_sta
== 0 &&
264 tx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
)) {
266 * No associated STAs - no need to send multicast
277 static ieee80211_tx_result
278 ieee80211_tx_h_sequence(struct ieee80211_tx_data
*tx
)
280 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
282 if (ieee80211_hdrlen(hdr
->frame_control
) >= 24)
283 ieee80211_include_sequence(tx
->sdata
, hdr
);
288 /* This function is called whenever the AP is about to exceed the maximum limit
289 * of buffered frames for power saving STAs. This situation should not really
290 * happen often during normal operation, so dropping the oldest buffered packet
291 * from each queue should be OK to make some room for new frames. */
292 static void purge_old_ps_buffers(struct ieee80211_local
*local
)
294 int total
= 0, purged
= 0;
296 struct ieee80211_sub_if_data
*sdata
;
297 struct sta_info
*sta
;
300 * virtual interfaces are protected by RCU
304 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
305 struct ieee80211_if_ap
*ap
;
306 if (sdata
->dev
== local
->mdev
||
307 sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
)
310 skb
= skb_dequeue(&ap
->ps_bc_buf
);
315 total
+= skb_queue_len(&ap
->ps_bc_buf
);
318 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
319 skb
= skb_dequeue(&sta
->ps_tx_buf
);
324 total
+= skb_queue_len(&sta
->ps_tx_buf
);
329 local
->total_ps_buffered
= total
;
330 printk(KERN_DEBUG
"%s: PS buffers full - purged %d frames\n",
331 wiphy_name(local
->hw
.wiphy
), purged
);
334 static ieee80211_tx_result
335 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data
*tx
)
337 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
340 * broadcast/multicast frame
342 * If any of the associated stations is in power save mode,
343 * the frame is buffered to be sent after DTIM beacon frame.
344 * This is done either by the hardware or us.
347 /* not AP/IBSS or ordered frame */
348 if (!tx
->sdata
->bss
|| (tx
->fc
& IEEE80211_FCTL_ORDER
))
351 /* no stations in PS mode */
352 if (!atomic_read(&tx
->sdata
->bss
->num_sta_ps
))
355 /* buffered in mac80211 */
356 if (tx
->local
->hw
.flags
& IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING
) {
357 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
358 purge_old_ps_buffers(tx
->local
);
359 if (skb_queue_len(&tx
->sdata
->bss
->ps_bc_buf
) >=
361 if (net_ratelimit()) {
362 printk(KERN_DEBUG
"%s: BC TX buffer full - "
363 "dropping the oldest frame\n",
366 dev_kfree_skb(skb_dequeue(&tx
->sdata
->bss
->ps_bc_buf
));
368 tx
->local
->total_ps_buffered
++;
369 skb_queue_tail(&tx
->sdata
->bss
->ps_bc_buf
, tx
->skb
);
373 /* buffered in hardware */
374 info
->flags
|= IEEE80211_TX_CTL_SEND_AFTER_DTIM
;
379 static ieee80211_tx_result
380 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data
*tx
)
382 struct sta_info
*sta
= tx
->sta
;
383 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
385 DECLARE_MAC_BUF(mac
);
388 ((tx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
389 (tx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PROBE_RESP
)))
392 staflags
= get_sta_flags(sta
);
394 if (unlikely((staflags
& WLAN_STA_PS
) &&
395 !(staflags
& WLAN_STA_PSPOLL
))) {
396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
397 printk(KERN_DEBUG
"STA %s aid %d: PS buffer (entries "
399 print_mac(mac
, sta
->addr
), sta
->aid
,
400 skb_queue_len(&sta
->ps_tx_buf
));
401 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
402 if (tx
->local
->total_ps_buffered
>= TOTAL_MAX_TX_BUFFER
)
403 purge_old_ps_buffers(tx
->local
);
404 if (skb_queue_len(&sta
->ps_tx_buf
) >= STA_MAX_TX_BUFFER
) {
405 struct sk_buff
*old
= skb_dequeue(&sta
->ps_tx_buf
);
406 if (net_ratelimit()) {
407 printk(KERN_DEBUG
"%s: STA %s TX "
408 "buffer full - dropping oldest frame\n",
409 tx
->dev
->name
, print_mac(mac
, sta
->addr
));
413 tx
->local
->total_ps_buffered
++;
415 /* Queue frame to be sent after STA sends an PS Poll frame */
416 if (skb_queue_empty(&sta
->ps_tx_buf
))
417 sta_info_set_tim_bit(sta
);
419 info
->control
.jiffies
= jiffies
;
420 skb_queue_tail(&sta
->ps_tx_buf
, tx
->skb
);
423 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
424 else if (unlikely(test_sta_flags(sta
, WLAN_STA_PS
))) {
425 printk(KERN_DEBUG
"%s: STA %s in PS mode, but pspoll "
426 "set -> send frame\n", tx
->dev
->name
,
427 print_mac(mac
, sta
->addr
));
429 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
430 clear_sta_flags(sta
, WLAN_STA_PSPOLL
);
435 static ieee80211_tx_result
436 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data
*tx
)
438 if (unlikely(tx
->flags
& IEEE80211_TX_PS_BUFFERED
))
441 if (tx
->flags
& IEEE80211_TX_UNICAST
)
442 return ieee80211_tx_h_unicast_ps_buf(tx
);
444 return ieee80211_tx_h_multicast_ps_buf(tx
);
447 static ieee80211_tx_result
448 ieee80211_tx_h_select_key(struct ieee80211_tx_data
*tx
)
450 struct ieee80211_key
*key
;
451 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
454 if (unlikely(info
->flags
& IEEE80211_TX_CTL_DO_NOT_ENCRYPT
))
456 else if (tx
->sta
&& (key
= rcu_dereference(tx
->sta
->key
)))
458 else if ((key
= rcu_dereference(tx
->sdata
->default_key
)))
460 else if (tx
->sdata
->drop_unencrypted
&&
461 !(info
->flags
& IEEE80211_TX_CTL_EAPOL_FRAME
) &&
462 !(info
->flags
& IEEE80211_TX_CTL_INJECTED
)) {
463 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_unencrypted
);
471 tx
->key
->tx_rx_count
++;
472 /* TODO: add threshold stuff again */
474 switch (tx
->key
->conf
.alg
) {
476 ftype
= fc
& IEEE80211_FCTL_FTYPE
;
477 stype
= fc
& IEEE80211_FCTL_STYPE
;
479 if (ftype
== IEEE80211_FTYPE_MGMT
&&
480 stype
== IEEE80211_STYPE_AUTH
)
484 if (!WLAN_FC_DATA_PRESENT(fc
))
490 if (!tx
->key
|| !(tx
->key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
491 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
496 static ieee80211_tx_result
497 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data
*tx
)
499 struct rate_selection rsel
;
500 struct ieee80211_supported_band
*sband
;
501 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
503 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
505 if (likely(tx
->rate_idx
< 0)) {
506 rate_control_get_rate(tx
->dev
, sband
, tx
->skb
, &rsel
);
507 tx
->rate_idx
= rsel
.rate_idx
;
508 if (unlikely(rsel
.probe_idx
>= 0)) {
509 info
->flags
|= IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
510 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
511 info
->control
.alt_retry_rate_idx
= tx
->rate_idx
;
512 tx
->rate_idx
= rsel
.probe_idx
;
514 info
->control
.alt_retry_rate_idx
= -1;
516 if (unlikely(tx
->rate_idx
< 0))
519 info
->control
.alt_retry_rate_idx
= -1;
521 if (tx
->sdata
->bss_conf
.use_cts_prot
&&
522 (tx
->flags
& IEEE80211_TX_FRAGMENTED
) && (rsel
.nonerp_idx
>= 0)) {
523 tx
->last_frag_rate_idx
= tx
->rate_idx
;
524 if (rsel
.probe_idx
>= 0)
525 tx
->flags
&= ~IEEE80211_TX_PROBE_LAST_FRAG
;
527 tx
->flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
528 tx
->rate_idx
= rsel
.nonerp_idx
;
529 info
->tx_rate_idx
= rsel
.nonerp_idx
;
530 info
->flags
&= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
532 tx
->last_frag_rate_idx
= tx
->rate_idx
;
533 info
->tx_rate_idx
= tx
->rate_idx
;
535 info
->tx_rate_idx
= tx
->rate_idx
;
540 static ieee80211_tx_result
541 ieee80211_tx_h_misc(struct ieee80211_tx_data
*tx
)
543 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
545 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(tx
->skb
);
546 struct ieee80211_supported_band
*sband
;
548 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
551 info
->control
.aid
= tx
->sta
->aid
;
553 if (!info
->control
.retry_limit
) {
554 if (!is_multicast_ether_addr(hdr
->addr1
)) {
555 int len
= min_t(int, tx
->skb
->len
+ FCS_LEN
,
556 tx
->local
->fragmentation_threshold
);
557 if (len
> tx
->local
->rts_threshold
558 && tx
->local
->rts_threshold
<
559 IEEE80211_MAX_RTS_THRESHOLD
) {
560 info
->flags
|= IEEE80211_TX_CTL_USE_RTS_CTS
;
562 IEEE80211_TX_CTL_LONG_RETRY_LIMIT
;
563 info
->control
.retry_limit
=
564 tx
->local
->long_retry_limit
;
566 info
->control
.retry_limit
=
567 tx
->local
->short_retry_limit
;
570 info
->control
.retry_limit
= 1;
574 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
575 /* Do not use multiple retry rates when sending fragmented
577 * TODO: The last fragment could still use multiple retry
579 info
->control
.alt_retry_rate_idx
= -1;
582 /* Use CTS protection for unicast frames sent using extended rates if
583 * there are associated non-ERP stations and RTS/CTS is not configured
585 if ((tx
->sdata
->flags
& IEEE80211_SDATA_OPERATING_GMODE
) &&
586 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_ERP_G
) &&
587 (tx
->flags
& IEEE80211_TX_UNICAST
) &&
588 tx
->sdata
->bss_conf
.use_cts_prot
&&
589 !(info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
))
590 info
->flags
|= IEEE80211_TX_CTL_USE_CTS_PROTECT
;
592 /* Transmit data frames using short preambles if the driver supports
593 * short preambles at the selected rate and short preambles are
594 * available on the network at the current point in time. */
595 if (ieee80211_is_data(hdr
->frame_control
) &&
596 (sband
->bitrates
[tx
->rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
) &&
597 tx
->sdata
->bss_conf
.use_short_preamble
&&
598 (!tx
->sta
|| test_sta_flags(tx
->sta
, WLAN_STA_SHORT_PREAMBLE
))) {
599 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
602 /* Setup duration field for the first fragment of the frame. Duration
603 * for remaining fragments will be updated when they are being sent
604 * to low-level driver in ieee80211_tx(). */
605 dur
= ieee80211_duration(tx
, is_multicast_ether_addr(hdr
->addr1
),
606 (tx
->flags
& IEEE80211_TX_FRAGMENTED
) ?
607 tx
->extra_frag
[0]->len
: 0);
608 hdr
->duration_id
= cpu_to_le16(dur
);
610 if ((info
->flags
& IEEE80211_TX_CTL_USE_RTS_CTS
) ||
611 (info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)) {
612 struct ieee80211_rate
*rate
;
616 /* Do not use multiple retry rates when using RTS/CTS */
617 info
->control
.alt_retry_rate_idx
= -1;
619 /* Use min(data rate, max base rate) as CTS/RTS rate */
620 rate
= &sband
->bitrates
[tx
->rate_idx
];
622 for (idx
= 0; idx
< sband
->n_bitrates
; idx
++) {
623 if (sband
->bitrates
[idx
].bitrate
> rate
->bitrate
)
625 if (tx
->sdata
->basic_rates
& BIT(idx
) &&
627 (sband
->bitrates
[baserate
].bitrate
628 < sband
->bitrates
[idx
].bitrate
)))
633 info
->control
.rts_cts_rate_idx
= baserate
;
635 info
->control
.rts_cts_rate_idx
= 0;
639 info
->control
.aid
= tx
->sta
->aid
;
644 static ieee80211_tx_result
645 ieee80211_tx_h_fragment(struct ieee80211_tx_data
*tx
)
647 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)tx
->skb
->data
;
648 size_t hdrlen
, per_fragm
, num_fragm
, payload_len
, left
;
649 struct sk_buff
**frags
, *first
, *frag
;
653 int frag_threshold
= tx
->local
->fragmentation_threshold
;
655 if (!(tx
->flags
& IEEE80211_TX_FRAGMENTED
))
659 * Warn when submitting a fragmented A-MPDU frame and drop it.
660 * This scenario is handled in __ieee80211_tx_prepare but extra
661 * caution taken here as fragmented ampdu may cause Tx stop.
663 if (WARN_ON(tx
->flags
& IEEE80211_TX_CTL_AMPDU
||
664 skb_get_queue_mapping(tx
->skb
) >=
665 ieee80211_num_regular_queues(&tx
->local
->hw
)))
670 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
671 payload_len
= first
->len
- hdrlen
;
672 per_fragm
= frag_threshold
- hdrlen
- FCS_LEN
;
673 num_fragm
= DIV_ROUND_UP(payload_len
, per_fragm
);
675 frags
= kzalloc(num_fragm
* sizeof(struct sk_buff
*), GFP_ATOMIC
);
679 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS
);
680 seq
= le16_to_cpu(hdr
->seq_ctrl
) & IEEE80211_SCTL_SEQ
;
681 pos
= first
->data
+ hdrlen
+ per_fragm
;
682 left
= payload_len
- per_fragm
;
683 for (i
= 0; i
< num_fragm
- 1; i
++) {
684 struct ieee80211_hdr
*fhdr
;
690 /* reserve enough extra head and tail room for possible
693 dev_alloc_skb(tx
->local
->tx_headroom
+
695 IEEE80211_ENCRYPT_HEADROOM
+
696 IEEE80211_ENCRYPT_TAILROOM
);
699 /* Make sure that all fragments use the same priority so
700 * that they end up using the same TX queue */
701 frag
->priority
= first
->priority
;
702 skb_reserve(frag
, tx
->local
->tx_headroom
+
703 IEEE80211_ENCRYPT_HEADROOM
);
704 fhdr
= (struct ieee80211_hdr
*) skb_put(frag
, hdrlen
);
705 memcpy(fhdr
, first
->data
, hdrlen
);
706 if (i
== num_fragm
- 2)
707 fhdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS
);
708 fhdr
->seq_ctrl
= cpu_to_le16(seq
| ((i
+ 1) & IEEE80211_SCTL_FRAG
));
709 copylen
= left
> per_fragm
? per_fragm
: left
;
710 memcpy(skb_put(frag
, copylen
), pos
, copylen
);
715 skb_trim(first
, hdrlen
+ per_fragm
);
717 tx
->num_extra_frag
= num_fragm
- 1;
718 tx
->extra_frag
= frags
;
723 printk(KERN_DEBUG
"%s: failed to fragment frame\n", tx
->dev
->name
);
725 for (i
= 0; i
< num_fragm
- 1; i
++)
727 dev_kfree_skb(frags
[i
]);
730 I802_DEBUG_INC(tx
->local
->tx_handlers_drop_fragment
);
734 static ieee80211_tx_result
735 ieee80211_tx_h_encrypt(struct ieee80211_tx_data
*tx
)
740 switch (tx
->key
->conf
.alg
) {
742 return ieee80211_crypto_wep_encrypt(tx
);
744 return ieee80211_crypto_tkip_encrypt(tx
);
746 return ieee80211_crypto_ccmp_encrypt(tx
);
754 static ieee80211_tx_result
755 ieee80211_tx_h_stats(struct ieee80211_tx_data
*tx
)
762 tx
->sta
->tx_packets
++;
763 tx
->sta
->tx_fragments
++;
764 tx
->sta
->tx_bytes
+= tx
->skb
->len
;
765 if (tx
->extra_frag
) {
766 tx
->sta
->tx_fragments
+= tx
->num_extra_frag
;
767 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
768 tx
->sta
->tx_bytes
+= tx
->extra_frag
[i
]->len
;
775 typedef ieee80211_tx_result (*ieee80211_tx_handler
)(struct ieee80211_tx_data
*);
776 static ieee80211_tx_handler ieee80211_tx_handlers
[] =
778 ieee80211_tx_h_check_assoc
,
779 ieee80211_tx_h_sequence
,
780 ieee80211_tx_h_ps_buf
,
781 ieee80211_tx_h_select_key
,
782 ieee80211_tx_h_michael_mic_add
,
783 ieee80211_tx_h_rate_ctrl
,
785 ieee80211_tx_h_fragment
,
786 /* handlers after fragment must be aware of tx info fragmentation! */
787 ieee80211_tx_h_encrypt
,
788 ieee80211_tx_h_stats
,
792 /* actual transmit path */
795 * deal with packet injection down monitor interface
796 * with Radiotap Header -- only called for monitor mode interface
798 static ieee80211_tx_result
799 __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data
*tx
,
803 * this is the moment to interpret and discard the radiotap header that
804 * must be at the start of the packet injected in Monitor mode
806 * Need to take some care with endian-ness since radiotap
807 * args are little-endian
810 struct ieee80211_radiotap_iterator iterator
;
811 struct ieee80211_radiotap_header
*rthdr
=
812 (struct ieee80211_radiotap_header
*) skb
->data
;
813 struct ieee80211_supported_band
*sband
;
814 int ret
= ieee80211_radiotap_iterator_init(&iterator
, rthdr
, skb
->len
);
815 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
817 sband
= tx
->local
->hw
.wiphy
->bands
[tx
->channel
->band
];
819 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
820 info
->flags
|= IEEE80211_TX_CTL_INJECTED
;
821 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
824 * for every radiotap entry that is present
825 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
826 * entries present, or -EINVAL on error)
832 ret
= ieee80211_radiotap_iterator_next(&iterator
);
837 /* see if this argument is something we can use */
838 switch (iterator
.this_arg_index
) {
840 * You must take care when dereferencing iterator.this_arg
841 * for multibyte types... the pointer is not aligned. Use
842 * get_unaligned((type *)iterator.this_arg) to dereference
843 * iterator.this_arg for type "type" safely on all arches.
845 case IEEE80211_RADIOTAP_RATE
:
847 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
848 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
850 target_rate
= (*iterator
.this_arg
) * 5;
851 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
852 struct ieee80211_rate
*r
;
854 r
= &sband
->bitrates
[i
];
856 if (r
->bitrate
== target_rate
) {
863 case IEEE80211_RADIOTAP_ANTENNA
:
865 * radiotap uses 0 for 1st ant, mac80211 is 1 for
868 info
->antenna_sel_tx
= (*iterator
.this_arg
) + 1;
872 case IEEE80211_RADIOTAP_DBM_TX_POWER
:
873 control
->power_level
= *iterator
.this_arg
;
877 case IEEE80211_RADIOTAP_FLAGS
:
878 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FCS
) {
880 * this indicates that the skb we have been
881 * handed has the 32-bit FCS CRC at the end...
882 * we should react to that by snipping it off
883 * because it will be recomputed and added
886 if (skb
->len
< (iterator
.max_length
+ FCS_LEN
))
889 skb_trim(skb
, skb
->len
- FCS_LEN
);
891 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_WEP
)
893 ~IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
894 if (*iterator
.this_arg
& IEEE80211_RADIOTAP_F_FRAG
)
895 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
899 * Please update the file
900 * Documentation/networking/mac80211-injection.txt
901 * when parsing new fields here.
909 if (ret
!= -ENOENT
) /* ie, if we didn't simply run out of fields */
913 * remove the radiotap header
914 * iterator->max_length was sanity-checked against
915 * skb->len by iterator init
917 skb_pull(skb
, iterator
.max_length
);
925 static ieee80211_tx_result
926 __ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
928 struct net_device
*dev
)
930 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
931 struct ieee80211_hdr
*hdr
;
932 struct ieee80211_sub_if_data
*sdata
;
933 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
937 memset(tx
, 0, sizeof(*tx
));
939 tx
->dev
= dev
; /* use original interface */
941 tx
->sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
942 tx
->channel
= local
->hw
.conf
.channel
;
944 tx
->last_frag_rate_idx
= -1;
946 * Set this flag (used below to indicate "automatic fragmentation"),
947 * it will be cleared/left by radiotap as desired.
949 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
951 /* process and remove the injection radiotap header */
952 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
953 if (unlikely(sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)) {
954 if (__ieee80211_parse_tx_radiotap(tx
, skb
) == TX_DROP
)
958 * __ieee80211_parse_tx_radiotap has now removed
959 * the radiotap header that was present and pre-filled
960 * 'tx' with tx control information.
964 hdr
= (struct ieee80211_hdr
*) skb
->data
;
966 tx
->sta
= sta_info_get(local
, hdr
->addr1
);
967 tx
->fc
= le16_to_cpu(hdr
->frame_control
);
969 if (is_multicast_ether_addr(hdr
->addr1
)) {
970 tx
->flags
&= ~IEEE80211_TX_UNICAST
;
971 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
973 tx
->flags
|= IEEE80211_TX_UNICAST
;
974 info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
977 if (tx
->flags
& IEEE80211_TX_FRAGMENTED
) {
978 if ((tx
->flags
& IEEE80211_TX_UNICAST
) &&
979 skb
->len
+ FCS_LEN
> local
->fragmentation_threshold
&&
980 !local
->ops
->set_frag_threshold
&&
981 !(info
->flags
& IEEE80211_TX_CTL_AMPDU
))
982 tx
->flags
|= IEEE80211_TX_FRAGMENTED
;
984 tx
->flags
&= ~IEEE80211_TX_FRAGMENTED
;
988 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
989 else if (test_and_clear_sta_flags(tx
->sta
, WLAN_STA_CLEAR_PS_FILT
))
990 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
992 hdrlen
= ieee80211_get_hdrlen(tx
->fc
);
993 if (skb
->len
> hdrlen
+ sizeof(rfc1042_header
) + 2) {
994 u8
*pos
= &skb
->data
[hdrlen
+ sizeof(rfc1042_header
)];
995 tx
->ethertype
= (pos
[0] << 8) | pos
[1];
997 info
->flags
|= IEEE80211_TX_CTL_FIRST_FRAGMENT
;
1003 * NB: @tx is uninitialised when passed in here
1005 static int ieee80211_tx_prepare(struct ieee80211_tx_data
*tx
,
1006 struct sk_buff
*skb
,
1007 struct net_device
*mdev
)
1009 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1010 struct net_device
*dev
;
1012 dev
= dev_get_by_index(&init_net
, info
->control
.ifindex
);
1013 if (unlikely(dev
&& !is_ieee80211_device(dev
, mdev
))) {
1019 /* initialises tx with control */
1020 __ieee80211_tx_prepare(tx
, skb
, dev
);
1025 static int __ieee80211_tx(struct ieee80211_local
*local
, struct sk_buff
*skb
,
1026 struct ieee80211_tx_data
*tx
)
1028 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1031 if (netif_subqueue_stopped(local
->mdev
, skb
))
1032 return IEEE80211_TX_AGAIN
;
1035 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1036 "TX to low-level driver", skb
);
1037 ret
= local
->ops
->tx(local_to_hw(local
), skb
);
1039 return IEEE80211_TX_AGAIN
;
1040 local
->mdev
->trans_start
= jiffies
;
1041 ieee80211_led_tx(local
, 1);
1043 if (tx
->extra_frag
) {
1044 for (i
= 0; i
< tx
->num_extra_frag
; i
++) {
1045 if (!tx
->extra_frag
[i
])
1047 info
= IEEE80211_SKB_CB(tx
->extra_frag
[i
]);
1048 info
->flags
&= ~(IEEE80211_TX_CTL_USE_RTS_CTS
|
1049 IEEE80211_TX_CTL_USE_CTS_PROTECT
|
1050 IEEE80211_TX_CTL_CLEAR_PS_FILT
|
1051 IEEE80211_TX_CTL_FIRST_FRAGMENT
);
1052 if (netif_subqueue_stopped(local
->mdev
,
1054 return IEEE80211_TX_FRAG_AGAIN
;
1055 if (i
== tx
->num_extra_frag
) {
1056 info
->tx_rate_idx
= tx
->last_frag_rate_idx
;
1058 if (tx
->flags
& IEEE80211_TX_PROBE_LAST_FRAG
)
1060 IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1063 ~IEEE80211_TX_CTL_RATE_CTRL_PROBE
;
1066 ieee80211_dump_frame(wiphy_name(local
->hw
.wiphy
),
1067 "TX to low-level driver",
1069 ret
= local
->ops
->tx(local_to_hw(local
),
1072 return IEEE80211_TX_FRAG_AGAIN
;
1073 local
->mdev
->trans_start
= jiffies
;
1074 ieee80211_led_tx(local
, 1);
1075 tx
->extra_frag
[i
] = NULL
;
1077 kfree(tx
->extra_frag
);
1078 tx
->extra_frag
= NULL
;
1080 return IEEE80211_TX_OK
;
1084 * Invoke TX handlers, return 0 on success and non-zero if the
1085 * frame was dropped or queued.
1087 static int invoke_tx_handlers(struct ieee80211_tx_data
*tx
)
1089 struct ieee80211_local
*local
= tx
->local
;
1090 struct sk_buff
*skb
= tx
->skb
;
1091 ieee80211_tx_handler
*handler
;
1092 ieee80211_tx_result res
= TX_DROP
;
1095 for (handler
= ieee80211_tx_handlers
; *handler
!= NULL
; handler
++) {
1096 res
= (*handler
)(tx
);
1097 if (res
!= TX_CONTINUE
)
1101 if (unlikely(res
== TX_DROP
)) {
1102 I802_DEBUG_INC(local
->tx_handlers_drop
);
1104 for (i
= 0; i
< tx
->num_extra_frag
; i
++)
1105 if (tx
->extra_frag
[i
])
1106 dev_kfree_skb(tx
->extra_frag
[i
]);
1107 kfree(tx
->extra_frag
);
1109 } else if (unlikely(res
== TX_QUEUED
)) {
1110 I802_DEBUG_INC(local
->tx_handlers_queued
);
1117 static int ieee80211_tx(struct net_device
*dev
, struct sk_buff
*skb
)
1119 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1120 struct sta_info
*sta
;
1121 struct ieee80211_tx_data tx
;
1122 ieee80211_tx_result res_prepare
;
1123 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1127 queue
= skb_get_queue_mapping(skb
);
1129 WARN_ON(test_bit(queue
, local
->queues_pending
));
1131 if (unlikely(skb
->len
< 10)) {
1138 /* initialises tx */
1139 res_prepare
= __ieee80211_tx_prepare(&tx
, skb
, dev
);
1141 if (res_prepare
== TX_DROP
) {
1148 tx
.channel
= local
->hw
.conf
.channel
;
1149 info
->band
= tx
.channel
->band
;
1151 if (invoke_tx_handlers(&tx
))
1154 if (tx
.extra_frag
) {
1155 for (i
= 0; i
< tx
.num_extra_frag
; i
++) {
1157 struct ieee80211_hdr
*hdr
=
1158 (struct ieee80211_hdr
*)
1159 tx
.extra_frag
[i
]->data
;
1161 if (i
+ 1 < tx
.num_extra_frag
) {
1162 next_len
= tx
.extra_frag
[i
+ 1]->len
;
1165 tx
.rate_idx
= tx
.last_frag_rate_idx
;
1167 dur
= ieee80211_duration(&tx
, 0, next_len
);
1168 hdr
->duration_id
= cpu_to_le16(dur
);
1173 ret
= __ieee80211_tx(local
, skb
, &tx
);
1175 struct ieee80211_tx_stored_packet
*store
;
1178 * Since there are no fragmented frames on A-MPDU
1179 * queues, there's no reason for a driver to reject
1180 * a frame there, warn and drop it.
1182 if (WARN_ON(queue
>= ieee80211_num_regular_queues(&local
->hw
)))
1185 store
= &local
->pending_packet
[queue
];
1187 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1189 set_bit(queue
, local
->queues_pending
);
1192 * When the driver gets out of buffers during sending of
1193 * fragments and calls ieee80211_stop_queue, the netif
1194 * subqueue is stopped. There is, however, a small window
1195 * in which the PENDING bit is not yet set. If a buffer
1196 * gets available in that window (i.e. driver calls
1197 * ieee80211_wake_queue), we would end up with ieee80211_tx
1198 * called with the PENDING bit still set. Prevent this by
1199 * continuing transmitting here when that situation is
1200 * possible to have happened.
1202 if (!__netif_subqueue_stopped(local
->mdev
, queue
)) {
1203 clear_bit(queue
, local
->queues_pending
);
1207 store
->extra_frag
= tx
.extra_frag
;
1208 store
->num_extra_frag
= tx
.num_extra_frag
;
1209 store
->last_frag_rate_idx
= tx
.last_frag_rate_idx
;
1210 store
->last_frag_rate_ctrl_probe
=
1211 !!(tx
.flags
& IEEE80211_TX_PROBE_LAST_FRAG
);
1220 for (i
= 0; i
< tx
.num_extra_frag
; i
++)
1221 if (tx
.extra_frag
[i
])
1222 dev_kfree_skb(tx
.extra_frag
[i
]);
1223 kfree(tx
.extra_frag
);
1228 /* device xmit handlers */
1230 static int ieee80211_skb_resize(struct ieee80211_local
*local
,
1231 struct sk_buff
*skb
,
1232 int head_need
, bool may_encrypt
)
1237 * This could be optimised, devices that do full hardware
1238 * crypto (including TKIP MMIC) need no tailroom... But we
1239 * have no drivers for such devices currently.
1242 tail_need
= IEEE80211_ENCRYPT_TAILROOM
;
1243 tail_need
-= skb_tailroom(skb
);
1244 tail_need
= max_t(int, tail_need
, 0);
1247 if (head_need
|| tail_need
) {
1248 /* Sorry. Can't account for this any more */
1252 if (skb_header_cloned(skb
))
1253 I802_DEBUG_INC(local
->tx_expand_skb_head_cloned
);
1255 I802_DEBUG_INC(local
->tx_expand_skb_head
);
1257 if (pskb_expand_head(skb
, head_need
, tail_need
, GFP_ATOMIC
)) {
1258 printk(KERN_DEBUG
"%s: failed to reallocate TX buffer\n",
1259 wiphy_name(local
->hw
.wiphy
));
1263 /* update truesize too */
1264 skb
->truesize
+= head_need
+ tail_need
;
1269 int ieee80211_master_start_xmit(struct sk_buff
*skb
,
1270 struct net_device
*dev
)
1272 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1273 struct net_device
*odev
= NULL
;
1274 struct ieee80211_sub_if_data
*osdata
;
1279 if (info
->control
.ifindex
)
1280 odev
= dev_get_by_index(&init_net
, info
->control
.ifindex
);
1281 if (unlikely(odev
&& !is_ieee80211_device(odev
, dev
))) {
1285 if (unlikely(!odev
)) {
1286 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1287 printk(KERN_DEBUG
"%s: Discarded packet with nonexistent "
1288 "originating device\n", dev
->name
);
1294 osdata
= IEEE80211_DEV_TO_SUB_IF(odev
);
1296 may_encrypt
= !(info
->flags
& IEEE80211_TX_CTL_DO_NOT_ENCRYPT
);
1298 headroom
= osdata
->local
->tx_headroom
;
1300 headroom
+= IEEE80211_ENCRYPT_HEADROOM
;
1301 headroom
-= skb_headroom(skb
);
1302 headroom
= max_t(int, 0, headroom
);
1304 if (ieee80211_skb_resize(osdata
->local
, skb
, headroom
, may_encrypt
)) {
1310 info
->control
.vif
= &osdata
->vif
;
1311 ret
= ieee80211_tx(odev
, skb
);
1317 int ieee80211_monitor_start_xmit(struct sk_buff
*skb
,
1318 struct net_device
*dev
)
1320 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1321 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1322 struct ieee80211_radiotap_header
*prthdr
=
1323 (struct ieee80211_radiotap_header
*)skb
->data
;
1326 /* check for not even having the fixed radiotap header part */
1327 if (unlikely(skb
->len
< sizeof(struct ieee80211_radiotap_header
)))
1328 goto fail
; /* too short to be possibly valid */
1330 /* is it a header version we can trust to find length from? */
1331 if (unlikely(prthdr
->it_version
))
1332 goto fail
; /* only version 0 is supported */
1334 /* then there must be a radiotap header with a length we can use */
1335 len_rthdr
= ieee80211_get_radiotap_len(skb
->data
);
1337 /* does the skb contain enough to deliver on the alleged length? */
1338 if (unlikely(skb
->len
< len_rthdr
))
1339 goto fail
; /* skb too short for claimed rt header extent */
1341 skb
->dev
= local
->mdev
;
1343 /* needed because we set skb device to master */
1344 info
->control
.ifindex
= dev
->ifindex
;
1346 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
1347 /* Interfaces should always request a status report */
1348 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1351 * fix up the pointers accounting for the radiotap
1352 * header still being in there. We are being given
1353 * a precooked IEEE80211 header so no need for
1356 skb_set_mac_header(skb
, len_rthdr
);
1358 * these are just fixed to the end of the rt area since we
1359 * don't have any better information and at this point, nobody cares
1361 skb_set_network_header(skb
, len_rthdr
);
1362 skb_set_transport_header(skb
, len_rthdr
);
1364 /* pass the radiotap header up to the next stage intact */
1365 dev_queue_xmit(skb
);
1366 return NETDEV_TX_OK
;
1370 return NETDEV_TX_OK
; /* meaning, we dealt with the skb */
1374 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1375 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1376 * @skb: packet to be sent
1377 * @dev: incoming interface
1379 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1380 * not be freed, and caller is responsible for either retrying later or freeing
1383 * This function takes in an Ethernet header and encapsulates it with suitable
1384 * IEEE 802.11 header based on which interface the packet is coming in. The
1385 * encapsulated packet will then be passed to master interface, wlan#.11, for
1386 * transmission (through low-level driver).
1388 int ieee80211_subif_start_xmit(struct sk_buff
*skb
,
1389 struct net_device
*dev
)
1391 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1392 struct ieee80211_tx_info
*info
;
1393 struct ieee80211_sub_if_data
*sdata
;
1394 int ret
= 1, head_need
;
1395 u16 ethertype
, hdrlen
, meshhdrlen
= 0;
1397 struct ieee80211_hdr hdr
;
1398 struct ieee80211s_hdr mesh_hdr
;
1399 const u8
*encaps_data
;
1400 int encaps_len
, skip_header_bytes
;
1402 struct sta_info
*sta
;
1405 sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1406 if (unlikely(skb
->len
< ETH_HLEN
)) {
1407 printk(KERN_DEBUG
"%s: short skb (len=%d)\n",
1408 dev
->name
, skb
->len
);
1413 nh_pos
= skb_network_header(skb
) - skb
->data
;
1414 h_pos
= skb_transport_header(skb
) - skb
->data
;
1416 /* convert Ethernet header to proper 802.11 header (based on
1417 * operation mode) */
1418 ethertype
= (skb
->data
[12] << 8) | skb
->data
[13];
1419 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
| IEEE80211_STYPE_DATA
);
1421 switch (sdata
->vif
.type
) {
1422 case IEEE80211_IF_TYPE_AP
:
1423 case IEEE80211_IF_TYPE_VLAN
:
1424 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
);
1426 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1427 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1428 memcpy(hdr
.addr3
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1431 case IEEE80211_IF_TYPE_WDS
:
1432 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1434 memcpy(hdr
.addr1
, sdata
->u
.wds
.remote_addr
, ETH_ALEN
);
1435 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1436 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1437 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1440 #ifdef CONFIG_MAC80211_MESH
1441 case IEEE80211_IF_TYPE_MESH_POINT
:
1442 fc
|= cpu_to_le16(IEEE80211_FCTL_FROMDS
| IEEE80211_FCTL_TODS
);
1444 if (is_multicast_ether_addr(skb
->data
))
1445 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1446 else if (mesh_nexthop_lookup(hdr
.addr1
, skb
, dev
))
1448 memcpy(hdr
.addr2
, dev
->dev_addr
, ETH_ALEN
);
1449 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1450 memcpy(hdr
.addr4
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1451 if (skb
->pkt_type
== PACKET_OTHERHOST
) {
1452 /* Forwarded frame, keep mesh ttl and seqnum */
1453 struct ieee80211s_hdr
*prev_meshhdr
;
1454 prev_meshhdr
= ((struct ieee80211s_hdr
*)skb
->cb
);
1455 meshhdrlen
= ieee80211_get_mesh_hdrlen(prev_meshhdr
);
1456 memcpy(&mesh_hdr
, prev_meshhdr
, meshhdrlen
);
1457 sdata
->u
.sta
.mshstats
.fwded_frames
++;
1459 if (!sdata
->u
.sta
.mshcfg
.dot11MeshTTL
) {
1460 /* Do not send frames with mesh_ttl == 0 */
1461 sdata
->u
.sta
.mshstats
.dropped_frames_ttl
++;
1465 meshhdrlen
= ieee80211_new_mesh_header(&mesh_hdr
,
1471 case IEEE80211_IF_TYPE_STA
:
1472 fc
|= cpu_to_le16(IEEE80211_FCTL_TODS
);
1474 memcpy(hdr
.addr1
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1475 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1476 memcpy(hdr
.addr3
, skb
->data
, ETH_ALEN
);
1479 case IEEE80211_IF_TYPE_IBSS
:
1481 memcpy(hdr
.addr1
, skb
->data
, ETH_ALEN
);
1482 memcpy(hdr
.addr2
, skb
->data
+ ETH_ALEN
, ETH_ALEN
);
1483 memcpy(hdr
.addr3
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1492 * There's no need to try to look up the destination
1493 * if it is a multicast address (which can only happen
1496 if (!is_multicast_ether_addr(hdr
.addr1
)) {
1498 sta
= sta_info_get(local
, hdr
.addr1
);
1500 sta_flags
= get_sta_flags(sta
);
1504 /* receiver and we are QoS enabled, use a QoS type frame */
1505 if (sta_flags
& WLAN_STA_WME
&&
1506 ieee80211_num_regular_queues(&local
->hw
) >= 4) {
1507 fc
|= cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1512 * Drop unicast frames to unauthorised stations unless they are
1513 * EAPOL frames from the local station.
1515 if (unlikely(!is_multicast_ether_addr(hdr
.addr1
) &&
1516 !(sta_flags
& WLAN_STA_AUTHORIZED
) &&
1517 !(ethertype
== ETH_P_PAE
&&
1518 compare_ether_addr(dev
->dev_addr
,
1519 skb
->data
+ ETH_ALEN
) == 0))) {
1520 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1521 DECLARE_MAC_BUF(mac
);
1523 if (net_ratelimit())
1524 printk(KERN_DEBUG
"%s: dropped frame to %s"
1525 " (unauthorized port)\n", dev
->name
,
1526 print_mac(mac
, hdr
.addr1
));
1529 I802_DEBUG_INC(local
->tx_handlers_drop_unauth_port
);
1535 hdr
.frame_control
= fc
;
1536 hdr
.duration_id
= 0;
1539 skip_header_bytes
= ETH_HLEN
;
1540 if (ethertype
== ETH_P_AARP
|| ethertype
== ETH_P_IPX
) {
1541 encaps_data
= bridge_tunnel_header
;
1542 encaps_len
= sizeof(bridge_tunnel_header
);
1543 skip_header_bytes
-= 2;
1544 } else if (ethertype
>= 0x600) {
1545 encaps_data
= rfc1042_header
;
1546 encaps_len
= sizeof(rfc1042_header
);
1547 skip_header_bytes
-= 2;
1553 skb_pull(skb
, skip_header_bytes
);
1554 nh_pos
-= skip_header_bytes
;
1555 h_pos
-= skip_header_bytes
;
1557 /* TODO: implement support for fragments so that there is no need to
1558 * reallocate and copy payload; it might be enough to support one
1559 * extra fragment that would be copied in the beginning of the frame
1560 * data.. anyway, it would be nice to include this into skb structure
1563 * There are few options for this:
1564 * use skb->cb as an extra space for 802.11 header
1565 * allocate new buffer if not enough headroom
1566 * make sure that there is enough headroom in every skb by increasing
1567 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1568 * alloc_skb() (net/core/skbuff.c)
1570 head_need
= hdrlen
+ encaps_len
+ meshhdrlen
- skb_headroom(skb
);
1573 * So we need to modify the skb header and hence need a copy of
1574 * that. The head_need variable above doesn't, so far, include
1575 * the needed header space that we don't need right away. If we
1576 * can, then we don't reallocate right now but only after the
1577 * frame arrives at the master device (if it does...)
1579 * If we cannot, however, then we will reallocate to include all
1580 * the ever needed space. Also, if we need to reallocate it anyway,
1581 * make it big enough for everything we may ever need.
1584 if (head_need
> 0 || skb_cloned(skb
)) {
1585 head_need
+= IEEE80211_ENCRYPT_HEADROOM
;
1586 head_need
+= local
->tx_headroom
;
1587 head_need
= max_t(int, 0, head_need
);
1588 if (ieee80211_skb_resize(local
, skb
, head_need
, true))
1593 memcpy(skb_push(skb
, encaps_len
), encaps_data
, encaps_len
);
1594 nh_pos
+= encaps_len
;
1595 h_pos
+= encaps_len
;
1598 if (meshhdrlen
> 0) {
1599 memcpy(skb_push(skb
, meshhdrlen
), &mesh_hdr
, meshhdrlen
);
1600 nh_pos
+= meshhdrlen
;
1601 h_pos
+= meshhdrlen
;
1604 if (ieee80211_is_data_qos(fc
)) {
1605 __le16
*qos_control
;
1607 qos_control
= (__le16
*) skb_push(skb
, 2);
1608 memcpy(skb_push(skb
, hdrlen
- 2), &hdr
, hdrlen
- 2);
1610 * Maybe we could actually set some fields here, for now just
1611 * initialise to zero to indicate no special operation.
1615 memcpy(skb_push(skb
, hdrlen
), &hdr
, hdrlen
);
1620 info
= IEEE80211_SKB_CB(skb
);
1621 memset(info
, 0, sizeof(*info
));
1622 info
->control
.ifindex
= dev
->ifindex
;
1623 if (ethertype
== ETH_P_PAE
)
1624 info
->flags
|= IEEE80211_TX_CTL_EAPOL_FRAME
;
1626 /* Interfaces should always request a status report */
1627 info
->flags
|= IEEE80211_TX_CTL_REQ_TX_STATUS
;
1629 skb
->dev
= local
->mdev
;
1630 dev
->stats
.tx_packets
++;
1631 dev
->stats
.tx_bytes
+= skb
->len
;
1633 /* Update skb pointers to various headers since this modified frame
1634 * is going to go through Linux networking code that may potentially
1635 * need things like pointer to IP header. */
1636 skb_set_mac_header(skb
, 0);
1637 skb_set_network_header(skb
, nh_pos
);
1638 skb_set_transport_header(skb
, h_pos
);
1640 dev
->trans_start
= jiffies
;
1641 dev_queue_xmit(skb
);
1654 * ieee80211_clear_tx_pending may not be called in a context where
1655 * it is possible that it packets could come in again.
1657 void ieee80211_clear_tx_pending(struct ieee80211_local
*local
)
1660 struct ieee80211_tx_stored_packet
*store
;
1662 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1663 if (!test_bit(i
, local
->queues_pending
))
1665 store
= &local
->pending_packet
[i
];
1666 kfree_skb(store
->skb
);
1667 for (j
= 0; j
< store
->num_extra_frag
; j
++)
1668 kfree_skb(store
->extra_frag
[j
]);
1669 kfree(store
->extra_frag
);
1670 clear_bit(i
, local
->queues_pending
);
1675 * Transmit all pending packets. Called from tasklet, locks master device
1676 * TX lock so that no new packets can come in.
1678 void ieee80211_tx_pending(unsigned long data
)
1680 struct ieee80211_local
*local
= (struct ieee80211_local
*)data
;
1681 struct net_device
*dev
= local
->mdev
;
1682 struct ieee80211_tx_stored_packet
*store
;
1683 struct ieee80211_tx_data tx
;
1686 netif_tx_lock_bh(dev
);
1687 for (i
= 0; i
< ieee80211_num_regular_queues(&local
->hw
); i
++) {
1688 /* Check that this queue is ok */
1689 if (__netif_subqueue_stopped(local
->mdev
, i
))
1692 if (!test_bit(i
, local
->queues_pending
)) {
1693 ieee80211_wake_queue(&local
->hw
, i
);
1697 store
= &local
->pending_packet
[i
];
1698 tx
.extra_frag
= store
->extra_frag
;
1699 tx
.num_extra_frag
= store
->num_extra_frag
;
1700 tx
.last_frag_rate_idx
= store
->last_frag_rate_idx
;
1702 if (store
->last_frag_rate_ctrl_probe
)
1703 tx
.flags
|= IEEE80211_TX_PROBE_LAST_FRAG
;
1704 ret
= __ieee80211_tx(local
, store
->skb
, &tx
);
1706 if (ret
== IEEE80211_TX_FRAG_AGAIN
)
1709 clear_bit(i
, local
->queues_pending
);
1710 ieee80211_wake_queue(&local
->hw
, i
);
1713 netif_tx_unlock_bh(dev
);
1716 /* functions for drivers to get certain frames */
1718 static void ieee80211_beacon_add_tim(struct ieee80211_local
*local
,
1719 struct ieee80211_if_ap
*bss
,
1720 struct sk_buff
*skb
,
1721 struct beacon_data
*beacon
)
1725 int i
, have_bits
= 0, n1
, n2
;
1727 /* Generate bitmap for TIM only if there are any STAs in power save
1729 if (atomic_read(&bss
->num_sta_ps
) > 0)
1730 /* in the hope that this is faster than
1731 * checking byte-for-byte */
1732 have_bits
= !bitmap_empty((unsigned long*)bss
->tim
,
1733 IEEE80211_MAX_AID
+1);
1735 if (bss
->dtim_count
== 0)
1736 bss
->dtim_count
= beacon
->dtim_period
- 1;
1740 tim
= pos
= (u8
*) skb_put(skb
, 6);
1741 *pos
++ = WLAN_EID_TIM
;
1743 *pos
++ = bss
->dtim_count
;
1744 *pos
++ = beacon
->dtim_period
;
1746 if (bss
->dtim_count
== 0 && !skb_queue_empty(&bss
->ps_bc_buf
))
1750 /* Find largest even number N1 so that bits numbered 1 through
1751 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1752 * (N2 + 1) x 8 through 2007 are 0. */
1754 for (i
= 0; i
< IEEE80211_MAX_TIM_LEN
; i
++) {
1761 for (i
= IEEE80211_MAX_TIM_LEN
- 1; i
>= n1
; i
--) {
1768 /* Bitmap control */
1770 /* Part Virt Bitmap */
1771 memcpy(pos
, bss
->tim
+ n1
, n2
- n1
+ 1);
1773 tim
[1] = n2
- n1
+ 4;
1774 skb_put(skb
, n2
- n1
);
1776 *pos
++ = aid0
; /* Bitmap control */
1777 *pos
++ = 0; /* Part Virt Bitmap */
1781 struct sk_buff
*ieee80211_beacon_get(struct ieee80211_hw
*hw
,
1782 struct ieee80211_vif
*vif
)
1784 struct ieee80211_local
*local
= hw_to_local(hw
);
1785 struct sk_buff
*skb
;
1786 struct ieee80211_tx_info
*info
;
1787 struct net_device
*bdev
;
1788 struct ieee80211_sub_if_data
*sdata
= NULL
;
1789 struct ieee80211_if_ap
*ap
= NULL
;
1790 struct rate_selection rsel
;
1791 struct beacon_data
*beacon
;
1792 struct ieee80211_supported_band
*sband
;
1793 struct ieee80211_mgmt
*mgmt
;
1796 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
1799 sband
= local
->hw
.wiphy
->bands
[band
];
1803 sdata
= vif_to_sdata(vif
);
1806 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_AP
) {
1808 beacon
= rcu_dereference(ap
->beacon
);
1811 * headroom, head length,
1812 * tail length and maximum TIM length
1814 skb
= dev_alloc_skb(local
->tx_headroom
+
1816 beacon
->tail_len
+ 256);
1820 skb_reserve(skb
, local
->tx_headroom
);
1821 memcpy(skb_put(skb
, beacon
->head_len
), beacon
->head
,
1824 ieee80211_include_sequence(sdata
,
1825 (struct ieee80211_hdr
*)skb
->data
);
1828 * Not very nice, but we want to allow the driver to call
1829 * ieee80211_beacon_get() as a response to the set_tim()
1830 * callback. That, however, is already invoked under the
1831 * sta_lock to guarantee consistent and race-free update
1832 * of the tim bitmap in mac80211 and the driver.
1834 if (local
->tim_in_locked_section
) {
1835 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1837 unsigned long flags
;
1839 spin_lock_irqsave(&local
->sta_lock
, flags
);
1840 ieee80211_beacon_add_tim(local
, ap
, skb
, beacon
);
1841 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
1845 memcpy(skb_put(skb
, beacon
->tail_len
),
1846 beacon
->tail
, beacon
->tail_len
);
1848 num_beacons
= &ap
->num_beacons
;
1852 } else if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1853 /* headroom, head length, tail length and maximum TIM length */
1854 skb
= dev_alloc_skb(local
->tx_headroom
+ 400);
1858 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1859 mgmt
= (struct ieee80211_mgmt
*)
1860 skb_put(skb
, 24 + sizeof(mgmt
->u
.beacon
));
1861 memset(mgmt
, 0, 24 + sizeof(mgmt
->u
.beacon
));
1862 mgmt
->frame_control
=
1863 cpu_to_le16(IEEE80211_FTYPE_MGMT
| IEEE80211_STYPE_BEACON
);
1864 memset(mgmt
->da
, 0xff, ETH_ALEN
);
1865 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1866 /* BSSID is left zeroed, wildcard value */
1867 mgmt
->u
.beacon
.beacon_int
=
1868 cpu_to_le16(local
->hw
.conf
.beacon_int
);
1869 mgmt
->u
.beacon
.capab_info
= 0x0; /* 0x0 for MPs */
1871 pos
= skb_put(skb
, 2);
1872 *pos
++ = WLAN_EID_SSID
;
1875 mesh_mgmt_ies_add(skb
, sdata
->dev
);
1877 num_beacons
= &sdata
->u
.sta
.num_beacons
;
1883 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1884 if (net_ratelimit())
1885 printk(KERN_DEBUG
"no beacon data avail for %s\n",
1887 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1892 info
= IEEE80211_SKB_CB(skb
);
1895 rate_control_get_rate(local
->mdev
, sband
, skb
, &rsel
);
1897 if (unlikely(rsel
.rate_idx
< 0)) {
1898 if (net_ratelimit()) {
1899 printk(KERN_DEBUG
"%s: ieee80211_beacon_get: "
1901 wiphy_name(local
->hw
.wiphy
));
1908 info
->control
.vif
= vif
;
1909 info
->tx_rate_idx
= rsel
.rate_idx
;
1910 if (sdata
->bss_conf
.use_short_preamble
&&
1911 sband
->bitrates
[rsel
.rate_idx
].flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
1912 info
->flags
|= IEEE80211_TX_CTL_SHORT_PREAMBLE
;
1913 info
->antenna_sel_tx
= local
->hw
.conf
.antenna_sel_tx
;
1914 info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
1915 info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
1916 info
->control
.retry_limit
= 1;
1917 info
->flags
|= IEEE80211_TX_CTL_CLEAR_PS_FILT
;
1923 EXPORT_SYMBOL(ieee80211_beacon_get
);
1925 void ieee80211_rts_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1926 const void *frame
, size_t frame_len
,
1927 const struct ieee80211_tx_info
*frame_txctl
,
1928 struct ieee80211_rts
*rts
)
1930 const struct ieee80211_hdr
*hdr
= frame
;
1932 rts
->frame_control
=
1933 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_RTS
);
1934 rts
->duration
= ieee80211_rts_duration(hw
, vif
, frame_len
,
1936 memcpy(rts
->ra
, hdr
->addr1
, sizeof(rts
->ra
));
1937 memcpy(rts
->ta
, hdr
->addr2
, sizeof(rts
->ta
));
1939 EXPORT_SYMBOL(ieee80211_rts_get
);
1941 void ieee80211_ctstoself_get(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
1942 const void *frame
, size_t frame_len
,
1943 const struct ieee80211_tx_info
*frame_txctl
,
1944 struct ieee80211_cts
*cts
)
1946 const struct ieee80211_hdr
*hdr
= frame
;
1948 cts
->frame_control
=
1949 cpu_to_le16(IEEE80211_FTYPE_CTL
| IEEE80211_STYPE_CTS
);
1950 cts
->duration
= ieee80211_ctstoself_duration(hw
, vif
,
1951 frame_len
, frame_txctl
);
1952 memcpy(cts
->ra
, hdr
->addr1
, sizeof(cts
->ra
));
1954 EXPORT_SYMBOL(ieee80211_ctstoself_get
);
1957 ieee80211_get_buffered_bc(struct ieee80211_hw
*hw
,
1958 struct ieee80211_vif
*vif
)
1960 struct ieee80211_local
*local
= hw_to_local(hw
);
1961 struct sk_buff
*skb
= NULL
;
1962 struct sta_info
*sta
;
1963 struct ieee80211_tx_data tx
;
1964 struct net_device
*bdev
;
1965 struct ieee80211_sub_if_data
*sdata
;
1966 struct ieee80211_if_ap
*bss
= NULL
;
1967 struct beacon_data
*beacon
;
1968 struct ieee80211_tx_info
*info
;
1970 sdata
= vif_to_sdata(vif
);
1978 beacon
= rcu_dereference(bss
->beacon
);
1980 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
|| !beacon
|| !beacon
->head
)
1983 if (bss
->dtim_count
!= 0)
1984 goto out
; /* send buffered bc/mc only after DTIM beacon */
1987 skb
= skb_dequeue(&bss
->ps_bc_buf
);
1990 local
->total_ps_buffered
--;
1992 if (!skb_queue_empty(&bss
->ps_bc_buf
) && skb
->len
>= 2) {
1993 struct ieee80211_hdr
*hdr
=
1994 (struct ieee80211_hdr
*) skb
->data
;
1995 /* more buffered multicast/broadcast frames ==> set
1996 * MoreData flag in IEEE 802.11 header to inform PS
1998 hdr
->frame_control
|=
1999 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
2002 if (!ieee80211_tx_prepare(&tx
, skb
, local
->mdev
))
2004 dev_kfree_skb_any(skb
);
2007 info
= IEEE80211_SKB_CB(skb
);
2010 tx
.flags
|= IEEE80211_TX_PS_BUFFERED
;
2011 tx
.channel
= local
->hw
.conf
.channel
;
2012 info
->band
= tx
.channel
->band
;
2014 if (invoke_tx_handlers(&tx
))
2021 EXPORT_SYMBOL(ieee80211_get_buffered_bc
);