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 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/rcupdate.h>
17 #include <net/mac80211.h>
18 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_led.h"
22 #include "ieee80211_common.h"
30 * these don't have dev/sdata fields in the rx data
31 * The sta value should also not be used because it may
32 * be NULL even though a STA (in IBSS mode) will be added.
35 static ieee80211_txrx_result
36 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data
*rx
)
38 u8
*data
= rx
->skb
->data
;
41 /* does the frame have a qos control field? */
42 if (WLAN_FC_IS_QOS_DATA(rx
->fc
)) {
43 u8
*qc
= data
+ ieee80211_get_hdrlen(rx
->fc
) - QOS_CONTROL_LEN
;
44 /* frame has qos control */
45 tid
= qc
[0] & QOS_CONTROL_TID_MASK
;
47 if (unlikely((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
)) {
48 /* Separate TID for management frames */
49 tid
= NUM_RX_DATA_QUEUES
- 1;
51 /* no qos control present */
52 tid
= 0; /* 802.1d - Best Effort */
56 I802_DEBUG_INC(rx
->local
->wme_rx_queue
[tid
]);
57 /* only a debug counter, sta might not be assigned properly yet */
59 I802_DEBUG_INC(rx
->sta
->wme_rx_queue
[tid
]);
62 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
63 * For now, set skb->priority to 0 for other cases. */
64 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
69 static ieee80211_txrx_result
70 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data
*rx
)
72 struct ieee80211_local
*local
= rx
->local
;
73 struct sk_buff
*skb
= rx
->skb
;
74 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
75 u32 load
= 0, hdrtime
;
76 struct ieee80211_rate
*rate
;
77 struct ieee80211_hw_mode
*mode
= local
->hw
.conf
.mode
;
80 /* Estimate total channel use caused by this frame */
82 if (unlikely(mode
->num_rates
< 0))
85 rate
= &mode
->rates
[0];
86 for (i
= 0; i
< mode
->num_rates
; i
++) {
87 if (mode
->rates
[i
].val
== rx
->u
.rx
.status
->rate
) {
88 rate
= &mode
->rates
[i
];
93 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
94 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
96 if (mode
->mode
== MODE_IEEE80211A
||
97 (mode
->mode
== MODE_IEEE80211G
&&
98 rate
->flags
& IEEE80211_RATE_ERP
))
99 hdrtime
= CHAN_UTIL_HDR_SHORT
;
101 hdrtime
= CHAN_UTIL_HDR_LONG
;
104 if (!is_multicast_ether_addr(hdr
->addr1
))
107 load
+= skb
->len
* rate
->rate_inv
;
109 /* Divide channel_use by 8 to avoid wrapping around the counter */
110 load
>>= CHAN_UTIL_SHIFT
;
111 local
->channel_use_raw
+= load
;
112 rx
->u
.rx
.load
= load
;
114 return TXRX_CONTINUE
;
117 ieee80211_rx_handler ieee80211_rx_pre_handlers
[] =
119 ieee80211_rx_h_parse_qos
,
120 ieee80211_rx_h_load_stats
,
126 static ieee80211_txrx_result
127 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data
*rx
)
130 rx
->sta
->channel_use_raw
+= rx
->u
.rx
.load
;
131 rx
->sdata
->channel_use_raw
+= rx
->u
.rx
.load
;
132 return TXRX_CONTINUE
;
136 ieee80211_rx_monitor(struct net_device
*dev
, struct sk_buff
*skb
,
137 struct ieee80211_rx_status
*status
)
139 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
140 struct ieee80211_rate
*rate
;
141 struct ieee80211_rtap_hdr
{
142 struct ieee80211_radiotap_header hdr
;
148 } __attribute__ ((packed
)) *rthdr
;
152 if (status
->flag
& RX_FLAG_RADIOTAP
)
155 if (skb_headroom(skb
) < sizeof(*rthdr
)) {
156 I802_DEBUG_INC(local
->rx_expand_skb_head
);
157 if (pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
)) {
163 rthdr
= (struct ieee80211_rtap_hdr
*) skb_push(skb
, sizeof(*rthdr
));
164 memset(rthdr
, 0, sizeof(*rthdr
));
165 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
166 rthdr
->hdr
.it_present
=
167 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
168 (1 << IEEE80211_RADIOTAP_RATE
) |
169 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
170 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL
));
171 rthdr
->flags
= local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
?
172 IEEE80211_RADIOTAP_F_FCS
: 0;
173 rate
= ieee80211_get_rate(local
, status
->phymode
, status
->rate
);
175 rthdr
->rate
= rate
->rate
/ 5;
176 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
178 status
->phymode
== MODE_IEEE80211A
?
179 cpu_to_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
) :
180 cpu_to_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
);
181 rthdr
->antsignal
= status
->ssi
;
184 dev
->stats
.rx_packets
++;
185 dev
->stats
.rx_bytes
+= skb
->len
;
187 skb_set_mac_header(skb
, 0);
188 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
189 skb
->pkt_type
= PACKET_OTHERHOST
;
190 skb
->protocol
= htons(ETH_P_802_2
);
191 memset(skb
->cb
, 0, sizeof(skb
->cb
));
195 static ieee80211_txrx_result
196 ieee80211_rx_h_monitor(struct ieee80211_txrx_data
*rx
)
198 if (rx
->sdata
->type
== IEEE80211_IF_TYPE_MNTR
) {
199 ieee80211_rx_monitor(rx
->dev
, rx
->skb
, rx
->u
.rx
.status
);
203 if (rx
->u
.rx
.status
->flag
& RX_FLAG_RADIOTAP
)
204 skb_pull(rx
->skb
, ieee80211_get_radiotap_len(rx
->skb
->data
));
206 return TXRX_CONTINUE
;
209 static ieee80211_txrx_result
210 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data
*rx
)
212 struct ieee80211_local
*local
= rx
->local
;
213 struct sk_buff
*skb
= rx
->skb
;
215 if (unlikely(local
->sta_scanning
!= 0)) {
216 ieee80211_sta_rx_scan(rx
->dev
, skb
, rx
->u
.rx
.status
);
220 if (unlikely(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
)) {
221 /* scanning finished during invoking of handlers */
222 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
226 return TXRX_CONTINUE
;
229 static ieee80211_txrx_result
230 ieee80211_rx_h_check(struct ieee80211_txrx_data
*rx
)
232 struct ieee80211_hdr
*hdr
;
233 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
235 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
236 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
237 if (unlikely(rx
->fc
& IEEE80211_FCTL_RETRY
&&
238 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] ==
240 if (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
) {
241 rx
->local
->dot11FrameDuplicateCount
++;
242 rx
->sta
->num_duplicates
++;
246 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] = hdr
->seq_ctrl
;
249 if ((rx
->local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) &&
250 rx
->skb
->len
> FCS_LEN
)
251 skb_trim(rx
->skb
, rx
->skb
->len
- FCS_LEN
);
253 if (unlikely(rx
->skb
->len
< 16)) {
254 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
258 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
259 rx
->skb
->pkt_type
= PACKET_OTHERHOST
;
260 else if (compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr1
) == 0)
261 rx
->skb
->pkt_type
= PACKET_HOST
;
262 else if (is_multicast_ether_addr(hdr
->addr1
)) {
263 if (is_broadcast_ether_addr(hdr
->addr1
))
264 rx
->skb
->pkt_type
= PACKET_BROADCAST
;
266 rx
->skb
->pkt_type
= PACKET_MULTICAST
;
268 rx
->skb
->pkt_type
= PACKET_OTHERHOST
;
270 /* Drop disallowed frame classes based on STA auth/assoc state;
271 * IEEE 802.11, Chap 5.5.
273 * 80211.o does filtering only based on association state, i.e., it
274 * drops Class 3 frames from not associated stations. hostapd sends
275 * deauth/disassoc frames when needed. In addition, hostapd is
276 * responsible for filtering on both auth and assoc states.
278 if (unlikely(((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
||
279 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
&&
280 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PSPOLL
)) &&
281 rx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
282 (!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_ASSOC
)))) {
283 if ((!(rx
->fc
& IEEE80211_FCTL_FROMDS
) &&
284 !(rx
->fc
& IEEE80211_FCTL_TODS
) &&
285 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)
286 || !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
287 /* Drop IBSS frames and frames for other hosts
292 if (!rx
->local
->apdev
)
295 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
296 ieee80211_msg_sta_not_assoc
);
300 return TXRX_CONTINUE
;
304 static ieee80211_txrx_result
305 ieee80211_rx_h_load_key(struct ieee80211_txrx_data
*rx
)
307 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
310 struct ieee80211_key
*stakey
= NULL
;
315 * There are three types of keys:
317 * - PTK (pairwise keys)
318 * - STK (station-to-station pairwise keys)
320 * When selecting a key, we have to distinguish between multicast
321 * (including broadcast) and unicast frames, the latter can only
322 * use PTKs and STKs while the former always use GTKs. Unless, of
323 * course, actual WEP keys ("pre-RSNA") are used, then unicast
324 * frames can also use key indizes like GTKs. Hence, if we don't
325 * have a PTK/STK we check the key index for a WEP key.
327 * Note that in a regular BSS, multicast frames are sent by the
328 * AP only, associated stations unicast the frame to the AP first
329 * which then multicasts it on their behalf.
331 * There is also a slight problem in IBSS mode: GTKs are negotiated
332 * with each station, that is something we don't currently handle.
333 * The spec seems to expect that one negotiates the same key with
334 * every station but there's no such requirement; VLANs could be
338 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
))
339 return TXRX_CONTINUE
;
342 * No point in finding a key if the frame is neither
343 * addressed to us nor a multicast frame.
345 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
346 return TXRX_CONTINUE
;
349 stakey
= rcu_dereference(rx
->sta
->key
);
351 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
355 * The device doesn't give us the IV so we won't be
356 * able to look up the key. That's ok though, we
357 * don't need to decrypt the frame, we just won't
358 * be able to keep statistics accurate.
359 * Except for key threshold notifications, should
360 * we somehow allow the driver to tell us which key
361 * the hardware used if this flag is set?
363 if ((rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
) &&
364 (rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
))
365 return TXRX_CONTINUE
;
367 hdrlen
= ieee80211_get_hdrlen(rx
->fc
);
369 if (rx
->skb
->len
< 8 + hdrlen
)
370 return TXRX_DROP
; /* TODO: count this? */
373 * no need to call ieee80211_wep_get_keyidx,
374 * it verifies a bunch of things we've done already
376 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
378 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
381 * RSNA-protected unicast frames should always be sent with
382 * pairwise or station-to-station keys, but for WEP we allow
383 * using a key index as well.
385 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
386 !is_multicast_ether_addr(hdr
->addr1
))
391 rx
->key
->tx_rx_count
++;
392 if (unlikely(rx
->local
->key_tx_rx_threshold
&&
393 rx
->key
->tx_rx_count
>
394 rx
->local
->key_tx_rx_threshold
)) {
395 ieee80211_key_threshold_notify(rx
->dev
, rx
->key
,
400 return TXRX_CONTINUE
;
403 static void ap_sta_ps_start(struct net_device
*dev
, struct sta_info
*sta
)
405 struct ieee80211_sub_if_data
*sdata
;
406 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
409 atomic_inc(&sdata
->bss
->num_sta_ps
);
410 sta
->flags
|= WLAN_STA_PS
;
412 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
413 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" aid %d enters power "
414 "save mode\n", dev
->name
, MAC_ARG(sta
->addr
), sta
->aid
);
415 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
418 static int ap_sta_ps_end(struct net_device
*dev
, struct sta_info
*sta
)
420 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
423 struct ieee80211_sub_if_data
*sdata
;
424 struct ieee80211_tx_packet_data
*pkt_data
;
426 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
428 atomic_dec(&sdata
->bss
->num_sta_ps
);
429 sta
->flags
&= ~(WLAN_STA_PS
| WLAN_STA_TIM
);
431 if (!skb_queue_empty(&sta
->ps_tx_buf
)) {
432 if (local
->ops
->set_tim
)
433 local
->ops
->set_tim(local_to_hw(local
), sta
->aid
, 0);
435 bss_tim_clear(local
, sdata
->bss
, sta
->aid
);
437 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
438 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" aid %d exits power "
439 "save mode\n", dev
->name
, MAC_ARG(sta
->addr
), sta
->aid
);
440 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
441 /* Send all buffered frames to the station */
442 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
443 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
445 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
448 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
449 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
450 local
->total_ps_buffered
--;
452 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
453 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" aid %d send PS frame "
454 "since STA not sleeping anymore\n", dev
->name
,
455 MAC_ARG(sta
->addr
), sta
->aid
);
456 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
457 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
464 static ieee80211_txrx_result
465 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data
*rx
)
467 struct sta_info
*sta
= rx
->sta
;
468 struct net_device
*dev
= rx
->dev
;
469 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
472 return TXRX_CONTINUE
;
474 /* Update last_rx only for IBSS packets which are for the current
475 * BSSID to avoid keeping the current IBSS network alive in cases where
476 * other STAs are using different BSSID. */
477 if (rx
->sdata
->type
== IEEE80211_IF_TYPE_IBSS
) {
478 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
);
479 if (compare_ether_addr(bssid
, rx
->sdata
->u
.sta
.bssid
) == 0)
480 sta
->last_rx
= jiffies
;
482 if (!is_multicast_ether_addr(hdr
->addr1
) ||
483 rx
->sdata
->type
== IEEE80211_IF_TYPE_STA
) {
484 /* Update last_rx only for unicast frames in order to prevent
485 * the Probe Request frames (the only broadcast frames from a
486 * STA in infrastructure mode) from keeping a connection alive.
488 sta
->last_rx
= jiffies
;
491 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
492 return TXRX_CONTINUE
;
495 sta
->rx_bytes
+= rx
->skb
->len
;
496 sta
->last_rssi
= rx
->u
.rx
.status
->ssi
;
497 sta
->last_signal
= rx
->u
.rx
.status
->signal
;
498 sta
->last_noise
= rx
->u
.rx
.status
->noise
;
500 if (!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
)) {
501 /* Change STA power saving mode only in the end of a frame
502 * exchange sequence */
503 if ((sta
->flags
& WLAN_STA_PS
) && !(rx
->fc
& IEEE80211_FCTL_PM
))
504 rx
->u
.rx
.sent_ps_buffered
+= ap_sta_ps_end(dev
, sta
);
505 else if (!(sta
->flags
& WLAN_STA_PS
) &&
506 (rx
->fc
& IEEE80211_FCTL_PM
))
507 ap_sta_ps_start(dev
, sta
);
510 /* Drop data::nullfunc frames silently, since they are used only to
511 * control station power saving mode. */
512 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
513 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_NULLFUNC
) {
514 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
515 /* Update counter and free packet here to avoid counting this
516 * as a dropped packed. */
518 dev_kfree_skb(rx
->skb
);
522 return TXRX_CONTINUE
;
523 } /* ieee80211_rx_h_sta_process */
525 static ieee80211_txrx_result
526 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data
*rx
)
528 if (!rx
->sta
|| !(rx
->fc
& IEEE80211_FCTL_PROTECTED
) ||
529 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
||
530 !rx
->key
|| rx
->key
->conf
.alg
!= ALG_WEP
||
531 !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
532 return TXRX_CONTINUE
;
534 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
535 if (!(rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
) ||
536 !(rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
))
537 if (ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
538 rx
->sta
->wep_weak_iv_count
++;
540 return TXRX_CONTINUE
;
543 static ieee80211_txrx_result
544 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data
*rx
)
546 if ((rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
) ||
547 !(rx
->fc
& IEEE80211_FCTL_PROTECTED
) ||
548 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
549 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
550 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)))
551 return TXRX_CONTINUE
;
555 printk(KERN_DEBUG
"%s: RX WEP frame, but no key set\n",
560 if (!(rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
)) {
561 if (ieee80211_wep_decrypt(rx
->local
, rx
->skb
, rx
->key
)) {
563 printk(KERN_DEBUG
"%s: RX WEP frame, decrypt "
564 "failed\n", rx
->dev
->name
);
567 } else if (!(rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
)) {
568 ieee80211_wep_remove_iv(rx
->local
, rx
->skb
, rx
->key
);
570 skb_trim(rx
->skb
, rx
->skb
->len
- 4);
573 return TXRX_CONTINUE
;
576 static inline struct ieee80211_fragment_entry
*
577 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
578 unsigned int frag
, unsigned int seq
, int rx_queue
,
579 struct sk_buff
**skb
)
581 struct ieee80211_fragment_entry
*entry
;
584 idx
= sdata
->fragment_next
;
585 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
586 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
587 sdata
->fragment_next
= 0;
589 if (!skb_queue_empty(&entry
->skb_list
)) {
590 #ifdef CONFIG_MAC80211_DEBUG
591 struct ieee80211_hdr
*hdr
=
592 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
593 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
594 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
595 "addr1=" MAC_FMT
" addr2=" MAC_FMT
"\n",
596 sdata
->dev
->name
, idx
,
597 jiffies
- entry
->first_frag_time
, entry
->seq
,
598 entry
->last_frag
, MAC_ARG(hdr
->addr1
),
599 MAC_ARG(hdr
->addr2
));
600 #endif /* CONFIG_MAC80211_DEBUG */
601 __skb_queue_purge(&entry
->skb_list
);
604 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
606 entry
->first_frag_time
= jiffies
;
608 entry
->rx_queue
= rx_queue
;
609 entry
->last_frag
= frag
;
611 entry
->extra_len
= 0;
616 static inline struct ieee80211_fragment_entry
*
617 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
618 u16 fc
, unsigned int frag
, unsigned int seq
,
619 int rx_queue
, struct ieee80211_hdr
*hdr
)
621 struct ieee80211_fragment_entry
*entry
;
624 idx
= sdata
->fragment_next
;
625 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
626 struct ieee80211_hdr
*f_hdr
;
631 idx
= IEEE80211_FRAGMENT_MAX
- 1;
633 entry
= &sdata
->fragments
[idx
];
634 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
635 entry
->rx_queue
!= rx_queue
||
636 entry
->last_frag
+ 1 != frag
)
639 f_hdr
= (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
640 f_fc
= le16_to_cpu(f_hdr
->frame_control
);
642 if ((fc
& IEEE80211_FCTL_FTYPE
) != (f_fc
& IEEE80211_FCTL_FTYPE
) ||
643 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
644 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
647 if (entry
->first_frag_time
+ 2 * HZ
< jiffies
) {
648 __skb_queue_purge(&entry
->skb_list
);
657 static ieee80211_txrx_result
658 ieee80211_rx_h_defragment(struct ieee80211_txrx_data
*rx
)
660 struct ieee80211_hdr
*hdr
;
662 unsigned int frag
, seq
;
663 struct ieee80211_fragment_entry
*entry
;
666 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
667 sc
= le16_to_cpu(hdr
->seq_ctrl
);
668 frag
= sc
& IEEE80211_SCTL_FRAG
;
670 if (likely((!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) && frag
== 0) ||
671 (rx
->skb
)->len
< 24 ||
672 is_multicast_ether_addr(hdr
->addr1
))) {
676 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
678 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
681 /* This is the first fragment of a new frame. */
682 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
683 rx
->u
.rx
.queue
, &(rx
->skb
));
684 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
685 (rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
686 /* Store CCMP PN so that we can verify that the next
687 * fragment has a sequential PN value. */
689 memcpy(entry
->last_pn
,
690 rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
],
696 /* This is a fragment for a frame that should already be pending in
697 * fragment cache. Add this fragment to the end of the pending entry.
699 entry
= ieee80211_reassemble_find(rx
->sdata
, rx
->fc
, frag
, seq
,
700 rx
->u
.rx
.queue
, hdr
);
702 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
706 /* Verify that MPDUs within one MSDU have sequential PN values.
707 * (IEEE 802.11i, 8.3.3.4.5) */
710 u8 pn
[CCMP_PN_LEN
], *rpn
;
711 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
713 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
714 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
719 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
];
720 if (memcmp(pn
, rpn
, CCMP_PN_LEN
) != 0) {
722 printk(KERN_DEBUG
"%s: defrag: CCMP PN not "
723 "sequential A2=" MAC_FMT
724 " PN=%02x%02x%02x%02x%02x%02x "
725 "(expected %02x%02x%02x%02x%02x%02x)\n",
726 rx
->dev
->name
, MAC_ARG(hdr
->addr2
),
727 rpn
[0], rpn
[1], rpn
[2], rpn
[3], rpn
[4],
728 rpn
[5], pn
[0], pn
[1], pn
[2], pn
[3],
732 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
735 skb_pull(rx
->skb
, ieee80211_get_hdrlen(rx
->fc
));
736 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
737 entry
->last_frag
= frag
;
738 entry
->extra_len
+= rx
->skb
->len
;
739 if (rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) {
744 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
745 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
746 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
747 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
749 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
750 __skb_queue_purge(&entry
->skb_list
);
754 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
755 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
759 /* Complete frame has been reassembled - process it now */
760 rx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
764 rx
->sta
->rx_packets
++;
765 if (is_multicast_ether_addr(hdr
->addr1
))
766 rx
->local
->dot11MulticastReceivedFrameCount
++;
768 ieee80211_led_rx(rx
->local
);
769 return TXRX_CONTINUE
;
772 static ieee80211_txrx_result
773 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data
*rx
)
778 if (likely(!rx
->sta
||
779 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_CTL
||
780 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PSPOLL
||
781 !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)))
782 return TXRX_CONTINUE
;
784 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
786 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
788 rx
->local
->total_ps_buffered
--;
790 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
791 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
794 struct ieee80211_hdr
*hdr
=
795 (struct ieee80211_hdr
*) skb
->data
;
797 /* tell TX path to send one frame even though the STA may
798 * still remain is PS mode after this frame exchange */
801 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
802 printk(KERN_DEBUG
"STA " MAC_FMT
" aid %d: PS Poll (entries "
804 MAC_ARG(rx
->sta
->addr
), rx
->sta
->aid
,
805 skb_queue_len(&rx
->sta
->ps_tx_buf
));
806 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
808 /* Use MoreData flag to indicate whether there are more
809 * buffered frames for this STA */
810 if (no_pending_pkts
) {
811 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
812 rx
->sta
->flags
&= ~WLAN_STA_TIM
;
814 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
818 if (no_pending_pkts
) {
819 if (rx
->local
->ops
->set_tim
)
820 rx
->local
->ops
->set_tim(local_to_hw(rx
->local
),
823 bss_tim_clear(rx
->local
, rx
->sdata
->bss
, rx
->sta
->aid
);
825 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
826 } else if (!rx
->u
.rx
.sent_ps_buffered
) {
827 printk(KERN_DEBUG
"%s: STA " MAC_FMT
" sent PS Poll even "
828 "though there is no buffered frames for it\n",
829 rx
->dev
->name
, MAC_ARG(rx
->sta
->addr
));
830 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
834 /* Free PS Poll skb here instead of returning TXRX_DROP that would
835 * count as an dropped frame. */
836 dev_kfree_skb(rx
->skb
);
841 static ieee80211_txrx_result
842 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data
*rx
)
845 u8
*data
= rx
->skb
->data
;
846 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) data
;
848 if (!WLAN_FC_IS_QOS_DATA(fc
))
849 return TXRX_CONTINUE
;
851 /* remove the qos control field, update frame type and meta-data */
852 memmove(data
+ 2, data
, ieee80211_get_hdrlen(fc
) - 2);
853 hdr
= (struct ieee80211_hdr
*) skb_pull(rx
->skb
, 2);
854 /* change frame type to non QOS */
855 rx
->fc
= fc
&= ~IEEE80211_STYPE_QOS_DATA
;
856 hdr
->frame_control
= cpu_to_le16(fc
);
858 return TXRX_CONTINUE
;
861 static ieee80211_txrx_result
862 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data
*rx
)
864 if (rx
->sdata
->eapol
&& ieee80211_is_eapol(rx
->skb
) &&
865 rx
->sdata
->type
!= IEEE80211_IF_TYPE_STA
&&
866 (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
867 /* Pass both encrypted and unencrypted EAPOL frames to user
868 * space for processing. */
869 if (!rx
->local
->apdev
)
871 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
872 ieee80211_msg_normal
);
876 if (unlikely(rx
->sdata
->ieee802_1x
&&
877 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
878 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_NULLFUNC
&&
879 (!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_AUTHORIZED
)) &&
880 !ieee80211_is_eapol(rx
->skb
))) {
881 #ifdef CONFIG_MAC80211_DEBUG
882 struct ieee80211_hdr
*hdr
=
883 (struct ieee80211_hdr
*) rx
->skb
->data
;
884 printk(KERN_DEBUG
"%s: dropped frame from " MAC_FMT
885 " (unauthorized port)\n", rx
->dev
->name
,
886 MAC_ARG(hdr
->addr2
));
887 #endif /* CONFIG_MAC80211_DEBUG */
891 return TXRX_CONTINUE
;
894 static ieee80211_txrx_result
895 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data
*rx
)
898 * Pass through unencrypted frames if the hardware has
899 * decrypted them already.
901 if (rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
)
902 return TXRX_CONTINUE
;
904 /* Drop unencrypted frames if key is set. */
905 if (unlikely(!(rx
->fc
& IEEE80211_FCTL_PROTECTED
) &&
906 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
907 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_NULLFUNC
&&
908 (rx
->key
|| rx
->sdata
->drop_unencrypted
) &&
909 (rx
->sdata
->eapol
== 0 ||
910 !ieee80211_is_eapol(rx
->skb
)))) {
912 printk(KERN_DEBUG
"%s: RX non-WEP frame, but expected "
913 "encryption\n", rx
->dev
->name
);
916 return TXRX_CONTINUE
;
919 static ieee80211_txrx_result
920 ieee80211_rx_h_data(struct ieee80211_txrx_data
*rx
)
922 struct net_device
*dev
= rx
->dev
;
923 struct ieee80211_local
*local
= rx
->local
;
924 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
925 u16 fc
, hdrlen
, ethertype
;
929 struct sk_buff
*skb
= rx
->skb
, *skb2
;
930 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
933 if (unlikely((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
))
934 return TXRX_CONTINUE
;
936 if (unlikely(!WLAN_FC_DATA_PRESENT(fc
)))
939 hdrlen
= ieee80211_get_hdrlen(fc
);
941 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
943 * IEEE 802.11 address fields:
944 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
945 * 0 0 DA SA BSSID n/a
946 * 0 1 DA BSSID SA n/a
947 * 1 0 BSSID SA DA n/a
951 switch (fc
& (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
952 case IEEE80211_FCTL_TODS
:
954 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
955 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
957 if (unlikely(sdata
->type
!= IEEE80211_IF_TYPE_AP
&&
958 sdata
->type
!= IEEE80211_IF_TYPE_VLAN
)) {
960 printk(KERN_DEBUG
"%s: dropped ToDS frame "
963 " DA=" MAC_FMT
")\n",
967 MAC_ARG(hdr
->addr3
));
971 case (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
973 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
974 memcpy(src
, hdr
->addr4
, ETH_ALEN
);
976 if (unlikely(sdata
->type
!= IEEE80211_IF_TYPE_WDS
)) {
978 printk(KERN_DEBUG
"%s: dropped FromDS&ToDS "
980 " TA=" MAC_FMT
" DA=" MAC_FMT
981 " SA=" MAC_FMT
")\n",
986 MAC_ARG(hdr
->addr4
));
990 case IEEE80211_FCTL_FROMDS
:
992 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
993 memcpy(src
, hdr
->addr3
, ETH_ALEN
);
995 if (sdata
->type
!= IEEE80211_IF_TYPE_STA
||
996 (is_multicast_ether_addr(dst
) &&
997 !compare_ether_addr(src
, dev
->dev_addr
)))
1002 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
1003 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
1005 if (sdata
->type
!= IEEE80211_IF_TYPE_IBSS
) {
1006 if (net_ratelimit()) {
1007 printk(KERN_DEBUG
"%s: dropped IBSS frame (DA="
1008 MAC_FMT
" SA=" MAC_FMT
" BSSID=" MAC_FMT
1010 dev
->name
, MAC_ARG(hdr
->addr1
),
1011 MAC_ARG(hdr
->addr2
),
1012 MAC_ARG(hdr
->addr3
));
1019 payload
= skb
->data
+ hdrlen
;
1021 if (unlikely(skb
->len
- hdrlen
< 8)) {
1022 if (net_ratelimit()) {
1023 printk(KERN_DEBUG
"%s: RX too short data frame "
1024 "payload\n", dev
->name
);
1029 ethertype
= (payload
[6] << 8) | payload
[7];
1031 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1032 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1033 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1034 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1035 * replace EtherType */
1036 skb_pull(skb
, hdrlen
+ 6);
1037 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1038 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1040 struct ethhdr
*ehdr
;
1042 skb_pull(skb
, hdrlen
);
1043 len
= htons(skb
->len
);
1044 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1045 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1046 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1047 ehdr
->h_proto
= len
;
1053 dev
->stats
.rx_packets
++;
1054 dev
->stats
.rx_bytes
+= skb
->len
;
1056 if (local
->bridge_packets
&& (sdata
->type
== IEEE80211_IF_TYPE_AP
1057 || sdata
->type
== IEEE80211_IF_TYPE_VLAN
) &&
1058 (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
1059 if (is_multicast_ether_addr(skb
->data
)) {
1060 /* send multicast frames both to higher layers in
1061 * local net stack and back to the wireless media */
1062 skb2
= skb_copy(skb
, GFP_ATOMIC
);
1063 if (!skb2
&& net_ratelimit())
1064 printk(KERN_DEBUG
"%s: failed to clone "
1065 "multicast frame\n", dev
->name
);
1067 struct sta_info
*dsta
;
1068 dsta
= sta_info_get(local
, skb
->data
);
1069 if (dsta
&& !dsta
->dev
) {
1070 if (net_ratelimit())
1071 printk(KERN_DEBUG
"Station with null "
1072 "dev structure!\n");
1073 } else if (dsta
&& dsta
->dev
== dev
) {
1074 /* Destination station is associated to this
1075 * AP, so send the frame directly to it and
1076 * do not pass the frame to local net stack.
1087 /* deliver to local stack */
1088 skb
->protocol
= eth_type_trans(skb
, dev
);
1089 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1094 /* send to wireless media */
1095 skb2
->protocol
= __constant_htons(ETH_P_802_3
);
1096 skb_set_network_header(skb2
, 0);
1097 skb_set_mac_header(skb2
, 0);
1098 dev_queue_xmit(skb2
);
1104 static ieee80211_txrx_result
1105 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data
*rx
)
1107 struct ieee80211_sub_if_data
*sdata
;
1109 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
1112 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1113 if ((sdata
->type
== IEEE80211_IF_TYPE_STA
||
1114 sdata
->type
== IEEE80211_IF_TYPE_IBSS
) &&
1115 !rx
->local
->user_space_mlme
) {
1116 ieee80211_sta_rx_mgmt(rx
->dev
, rx
->skb
, rx
->u
.rx
.status
);
1118 /* Management frames are sent to hostapd for processing */
1119 if (!rx
->local
->apdev
)
1121 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
1122 ieee80211_msg_normal
);
1127 static inline ieee80211_txrx_result
__ieee80211_invoke_rx_handlers(
1128 struct ieee80211_local
*local
,
1129 ieee80211_rx_handler
*handlers
,
1130 struct ieee80211_txrx_data
*rx
,
1131 struct sta_info
*sta
)
1133 ieee80211_rx_handler
*handler
;
1134 ieee80211_txrx_result res
= TXRX_DROP
;
1136 for (handler
= handlers
; *handler
!= NULL
; handler
++) {
1137 res
= (*handler
)(rx
);
1143 I802_DEBUG_INC(local
->rx_handlers_drop
);
1148 I802_DEBUG_INC(local
->rx_handlers_queued
);
1154 if (res
== TXRX_DROP
)
1155 dev_kfree_skb(rx
->skb
);
1159 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local
*local
,
1160 ieee80211_rx_handler
*handlers
,
1161 struct ieee80211_txrx_data
*rx
,
1162 struct sta_info
*sta
)
1164 if (__ieee80211_invoke_rx_handlers(local
, handlers
, rx
, sta
) ==
1166 dev_kfree_skb(rx
->skb
);
1169 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1170 struct ieee80211_hdr
*hdr
,
1171 struct sta_info
*sta
,
1172 struct ieee80211_txrx_data
*rx
)
1176 hdrlen
= ieee80211_get_hdrlen_from_skb(rx
->skb
);
1177 if (rx
->skb
->len
>= hdrlen
+ 4)
1178 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1182 /* TODO: verify that this is not triggered by fragmented
1183 * frames (hw does not verify MIC for them). */
1184 if (net_ratelimit())
1185 printk(KERN_DEBUG
"%s: TKIP hwaccel reported Michael MIC "
1186 "failure from " MAC_FMT
" to " MAC_FMT
" keyidx=%d\n",
1187 dev
->name
, MAC_ARG(hdr
->addr2
), MAC_ARG(hdr
->addr1
),
1191 /* Some hardware versions seem to generate incorrect
1192 * Michael MIC reports; ignore them to avoid triggering
1193 * countermeasures. */
1194 if (net_ratelimit())
1195 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1196 "error for unknown address " MAC_FMT
"\n",
1197 dev
->name
, MAC_ARG(hdr
->addr2
));
1201 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
1202 if (net_ratelimit())
1203 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1204 "error for a frame with no ISWEP flag (src "
1205 MAC_FMT
")\n", dev
->name
, MAC_ARG(hdr
->addr2
));
1209 if (rx
->sdata
->type
== IEEE80211_IF_TYPE_AP
&& keyidx
) {
1210 /* AP with Pairwise keys support should never receive Michael
1211 * MIC errors for non-zero keyidx because these are reserved
1212 * for group keys and only the AP is sending real multicast
1214 if (net_ratelimit())
1215 printk(KERN_DEBUG
"%s: ignored Michael MIC error for "
1216 "a frame with non-zero keyidx (%d)"
1217 " (src " MAC_FMT
")\n", dev
->name
, keyidx
,
1218 MAC_ARG(hdr
->addr2
));
1222 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
1223 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
1224 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)) {
1225 if (net_ratelimit())
1226 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1227 "error for a frame that cannot be encrypted "
1228 "(fc=0x%04x) (src " MAC_FMT
")\n",
1229 dev
->name
, rx
->fc
, MAC_ARG(hdr
->addr2
));
1233 /* TODO: consider verifying the MIC error report with software
1234 * implementation if we get too many spurious reports from the
1237 mac80211_ev_michael_mic_failure(rx
->dev
, keyidx
, hdr
);
1239 dev_kfree_skb(rx
->skb
);
1243 ieee80211_rx_handler ieee80211_rx_handlers
[] =
1245 ieee80211_rx_h_if_stats
,
1246 ieee80211_rx_h_monitor
,
1247 ieee80211_rx_h_passive_scan
,
1248 ieee80211_rx_h_check
,
1249 ieee80211_rx_h_load_key
,
1250 ieee80211_rx_h_sta_process
,
1251 ieee80211_rx_h_ccmp_decrypt
,
1252 ieee80211_rx_h_tkip_decrypt
,
1253 ieee80211_rx_h_wep_weak_iv_detection
,
1254 ieee80211_rx_h_wep_decrypt
,
1255 ieee80211_rx_h_defragment
,
1256 ieee80211_rx_h_ps_poll
,
1257 ieee80211_rx_h_michael_mic_verify
,
1258 /* this must be after decryption - so header is counted in MPDU mic
1259 * must be before pae and data, so QOS_DATA format frames
1260 * are not passed to user space by these functions
1262 ieee80211_rx_h_remove_qos_control
,
1263 ieee80211_rx_h_802_1x_pae
,
1264 ieee80211_rx_h_drop_unencrypted
,
1265 ieee80211_rx_h_data
,
1266 ieee80211_rx_h_mgmt
,
1270 /* main receive path */
1272 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
1273 u8
*bssid
, struct ieee80211_txrx_data
*rx
,
1274 struct ieee80211_hdr
*hdr
)
1276 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
1278 switch (sdata
->type
) {
1279 case IEEE80211_IF_TYPE_STA
:
1282 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1283 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1285 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1286 } else if (!multicast
&&
1287 compare_ether_addr(sdata
->dev
->dev_addr
,
1289 if (!(sdata
->flags
& IEEE80211_SDATA_PROMISC
))
1291 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1294 case IEEE80211_IF_TYPE_IBSS
:
1297 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1298 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1300 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1301 } else if (!multicast
&&
1302 compare_ether_addr(sdata
->dev
->dev_addr
,
1304 if (!(sdata
->flags
& IEEE80211_SDATA_PROMISC
))
1306 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1307 } else if (!rx
->sta
)
1308 rx
->sta
= ieee80211_ibss_add_sta(sdata
->dev
, rx
->skb
,
1311 case IEEE80211_IF_TYPE_AP
:
1313 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1316 } else if (!ieee80211_bssid_match(bssid
,
1317 sdata
->dev
->dev_addr
)) {
1318 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1320 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1322 if (sdata
->dev
== sdata
->local
->mdev
&&
1323 !(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1324 /* do not receive anything via
1325 * master device when not scanning */
1328 case IEEE80211_IF_TYPE_WDS
:
1330 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
)
1332 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
1341 * This is the receive path handler. It is called by a low level driver when an
1342 * 802.11 MPDU is received from the hardware.
1344 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
1345 struct ieee80211_rx_status
*status
)
1347 struct ieee80211_local
*local
= hw_to_local(hw
);
1348 struct ieee80211_sub_if_data
*sdata
;
1349 struct sta_info
*sta
;
1350 struct ieee80211_hdr
*hdr
;
1351 struct ieee80211_txrx_data rx
;
1353 int radiotap_len
= 0, prepres
;
1354 struct ieee80211_sub_if_data
*prev
= NULL
;
1355 struct sk_buff
*skb_new
;
1358 if (status
->flag
& RX_FLAG_RADIOTAP
) {
1359 radiotap_len
= ieee80211_get_radiotap_len(skb
->data
);
1360 skb_pull(skb
, radiotap_len
);
1364 * key references are protected using RCU and this requires that
1365 * we are in a read-site RCU section during receive processing
1369 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1370 memset(&rx
, 0, sizeof(rx
));
1374 rx
.u
.rx
.status
= status
;
1375 rx
.fc
= skb
->len
>= 2 ? le16_to_cpu(hdr
->frame_control
) : 0;
1376 type
= rx
.fc
& IEEE80211_FCTL_FTYPE
;
1377 if (type
== IEEE80211_FTYPE_DATA
|| type
== IEEE80211_FTYPE_MGMT
)
1378 local
->dot11ReceivedFragmentCount
++;
1380 if (skb
->len
>= 16) {
1381 sta
= rx
.sta
= sta_info_get(local
, hdr
->addr2
);
1383 rx
.dev
= rx
.sta
->dev
;
1384 rx
.sdata
= IEEE80211_DEV_TO_SUB_IF(rx
.dev
);
1387 sta
= rx
.sta
= NULL
;
1389 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
1390 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, sta
, &rx
);
1394 if (unlikely(local
->sta_scanning
))
1395 rx
.flags
|= IEEE80211_TXRXD_RXIN_SCAN
;
1397 if (__ieee80211_invoke_rx_handlers(local
, local
->rx_pre_handlers
, &rx
,
1398 sta
) != TXRX_CONTINUE
)
1402 skb_push(skb
, radiotap_len
);
1403 if (sta
&& !(sta
->flags
& (WLAN_STA_WDS
| WLAN_STA_ASSOC_AP
)) &&
1404 !local
->iff_promiscs
&& !is_multicast_ether_addr(hdr
->addr1
)) {
1405 rx
.flags
|= IEEE80211_TXRXD_RXRA_MATCH
;
1406 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
, &rx
,
1413 bssid
= ieee80211_get_bssid(hdr
, skb
->len
- radiotap_len
);
1415 read_lock(&local
->sub_if_lock
);
1416 list_for_each_entry(sdata
, &local
->sub_if_list
, list
) {
1417 rx
.flags
|= IEEE80211_TXRXD_RXRA_MATCH
;
1419 if (!netif_running(sdata
->dev
))
1422 prepres
= prepare_for_handlers(sdata
, bssid
, &rx
, hdr
);
1423 /* prepare_for_handlers can change sta */
1430 * frame is destined for this interface, but if it's not
1431 * also for the previous one we handle that after the
1432 * loop to avoid copying the SKB once too much
1441 * frame was destined for the previous interface
1442 * so invoke RX handlers for it
1445 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
1447 if (net_ratelimit())
1448 printk(KERN_DEBUG
"%s: failed to copy "
1449 "multicast frame for %s",
1450 local
->mdev
->name
, prev
->dev
->name
);
1456 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
,
1464 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
,
1468 read_unlock(&local
->sub_if_lock
);
1476 EXPORT_SYMBOL(__ieee80211_rx
);
1478 /* This is a version of the rx handler that can be called from hard irq
1479 * context. Post the skb on the queue and schedule the tasklet */
1480 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
1481 struct ieee80211_rx_status
*status
)
1483 struct ieee80211_local
*local
= hw_to_local(hw
);
1485 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
1487 skb
->dev
= local
->mdev
;
1488 /* copy status into skb->cb for use by tasklet */
1489 memcpy(skb
->cb
, status
, sizeof(*status
));
1490 skb
->pkt_type
= IEEE80211_RX_MSG
;
1491 skb_queue_tail(&local
->skb_queue
, skb
);
1492 tasklet_schedule(&local
->tasklet
);
1494 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);