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"
29 * monitor mode reception
31 * This function cleans up the SKB, i.e. it removes all the stuff
32 * only useful for monitoring.
34 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
38 skb_pull(skb
, rtap_len
);
40 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
41 if (likely(skb
->len
> FCS_LEN
))
42 skb_trim(skb
, skb
->len
- FCS_LEN
);
54 static inline int should_drop_frame(struct ieee80211_rx_status
*status
,
59 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
61 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
63 if (unlikely(skb
->len
< 16 + present_fcs_len
+ radiotap_len
))
65 if ((hdr
->frame_control
& cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ==
66 cpu_to_le16(IEEE80211_FTYPE_CTL
))
72 * This function copies a received frame to all monitor interfaces and
73 * returns a cleaned-up SKB that no longer includes the FCS nor the
74 * radiotap header the driver might have added.
76 static struct sk_buff
*
77 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
78 struct ieee80211_rx_status
*status
)
80 struct ieee80211_sub_if_data
*sdata
;
81 struct ieee80211_rate
*rate
;
82 int needed_headroom
= 0;
83 struct ieee80211_rtap_hdr
{
84 struct ieee80211_radiotap_header hdr
;
90 u8 padding_for_rxflags
;
92 } __attribute__ ((packed
)) *rthdr
;
93 struct sk_buff
*skb
, *skb2
;
94 struct net_device
*prev_dev
= NULL
;
95 int present_fcs_len
= 0;
99 * First, we may need to make a copy of the skb because
100 * (1) we need to modify it for radiotap (if not present), and
101 * (2) the other RX handlers will modify the skb we got.
103 * We don't need to, of course, if we aren't going to return
104 * the SKB because it has a bad FCS/PLCP checksum.
106 if (status
->flag
& RX_FLAG_RADIOTAP
)
107 rtap_len
= ieee80211_get_radiotap_len(origskb
->data
);
109 needed_headroom
= sizeof(*rthdr
);
111 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
112 present_fcs_len
= FCS_LEN
;
114 if (!local
->monitors
) {
115 if (should_drop_frame(status
, origskb
, present_fcs_len
,
117 dev_kfree_skb(origskb
);
121 return remove_monitor_info(local
, origskb
, rtap_len
);
124 if (should_drop_frame(status
, origskb
, present_fcs_len
, rtap_len
)) {
125 /* only need to expand headroom if necessary */
130 * This shouldn't trigger often because most devices have an
131 * RX header they pull before we get here, and that should
132 * be big enough for our radiotap information. We should
133 * probably export the length to drivers so that we can have
134 * them allocate enough headroom to start with.
136 if (skb_headroom(skb
) < needed_headroom
&&
137 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
)) {
143 * Need to make a copy and possibly remove radiotap header
144 * and FCS from the original.
146 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
148 origskb
= remove_monitor_info(local
, origskb
, rtap_len
);
154 /* if necessary, prepend radiotap information */
155 if (!(status
->flag
& RX_FLAG_RADIOTAP
)) {
156 rthdr
= (void *) skb_push(skb
, sizeof(*rthdr
));
157 memset(rthdr
, 0, sizeof(*rthdr
));
158 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
159 rthdr
->hdr
.it_present
=
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
161 (1 << IEEE80211_RADIOTAP_RATE
) |
162 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
163 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL
) |
164 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
165 rthdr
->flags
= local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
?
166 IEEE80211_RADIOTAP_F_FCS
: 0;
168 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
171 (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
173 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS
);
175 rate
= ieee80211_get_rate(local
, status
->phymode
,
178 rthdr
->rate
= rate
->rate
/ 5;
180 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
182 if (status
->phymode
== MODE_IEEE80211A
)
184 cpu_to_le16(IEEE80211_CHAN_OFDM
|
185 IEEE80211_CHAN_5GHZ
);
188 cpu_to_le16(IEEE80211_CHAN_DYN
|
189 IEEE80211_CHAN_2GHZ
);
191 rthdr
->antsignal
= status
->ssi
;
194 skb_set_mac_header(skb
, 0);
195 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
196 skb
->pkt_type
= PACKET_OTHERHOST
;
197 skb
->protocol
= htons(ETH_P_802_2
);
199 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
200 if (!netif_running(sdata
->dev
))
203 if (sdata
->type
!= IEEE80211_IF_TYPE_MNTR
)
207 skb2
= skb_clone(skb
, GFP_ATOMIC
);
209 skb2
->dev
= prev_dev
;
214 prev_dev
= sdata
->dev
;
215 sdata
->dev
->stats
.rx_packets
++;
216 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
231 * these don't have dev/sdata fields in the rx data
232 * The sta value should also not be used because it may
233 * be NULL even though a STA (in IBSS mode) will be added.
236 static ieee80211_txrx_result
237 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data
*rx
)
239 u8
*data
= rx
->skb
->data
;
242 /* does the frame have a qos control field? */
243 if (WLAN_FC_IS_QOS_DATA(rx
->fc
)) {
244 u8
*qc
= data
+ ieee80211_get_hdrlen(rx
->fc
) - QOS_CONTROL_LEN
;
245 /* frame has qos control */
246 tid
= qc
[0] & QOS_CONTROL_TID_MASK
;
248 if (unlikely((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
)) {
249 /* Separate TID for management frames */
250 tid
= NUM_RX_DATA_QUEUES
- 1;
252 /* no qos control present */
253 tid
= 0; /* 802.1d - Best Effort */
257 I802_DEBUG_INC(rx
->local
->wme_rx_queue
[tid
]);
258 /* only a debug counter, sta might not be assigned properly yet */
260 I802_DEBUG_INC(rx
->sta
->wme_rx_queue
[tid
]);
262 rx
->u
.rx
.queue
= tid
;
263 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
264 * For now, set skb->priority to 0 for other cases. */
265 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
267 return TXRX_CONTINUE
;
270 static ieee80211_txrx_result
271 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data
*rx
)
273 struct ieee80211_local
*local
= rx
->local
;
274 struct sk_buff
*skb
= rx
->skb
;
275 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
276 u32 load
= 0, hdrtime
;
277 struct ieee80211_rate
*rate
;
278 struct ieee80211_hw_mode
*mode
= local
->hw
.conf
.mode
;
281 /* Estimate total channel use caused by this frame */
283 if (unlikely(mode
->num_rates
< 0))
284 return TXRX_CONTINUE
;
286 rate
= &mode
->rates
[0];
287 for (i
= 0; i
< mode
->num_rates
; i
++) {
288 if (mode
->rates
[i
].val
== rx
->u
.rx
.status
->rate
) {
289 rate
= &mode
->rates
[i
];
294 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
295 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
297 if (mode
->mode
== MODE_IEEE80211A
||
298 (mode
->mode
== MODE_IEEE80211G
&&
299 rate
->flags
& IEEE80211_RATE_ERP
))
300 hdrtime
= CHAN_UTIL_HDR_SHORT
;
302 hdrtime
= CHAN_UTIL_HDR_LONG
;
305 if (!is_multicast_ether_addr(hdr
->addr1
))
308 load
+= skb
->len
* rate
->rate_inv
;
310 /* Divide channel_use by 8 to avoid wrapping around the counter */
311 load
>>= CHAN_UTIL_SHIFT
;
312 local
->channel_use_raw
+= load
;
313 rx
->u
.rx
.load
= load
;
315 return TXRX_CONTINUE
;
318 ieee80211_rx_handler ieee80211_rx_pre_handlers
[] =
320 ieee80211_rx_h_parse_qos
,
321 ieee80211_rx_h_load_stats
,
327 static ieee80211_txrx_result
328 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data
*rx
)
331 rx
->sta
->channel_use_raw
+= rx
->u
.rx
.load
;
332 rx
->sdata
->channel_use_raw
+= rx
->u
.rx
.load
;
333 return TXRX_CONTINUE
;
336 static ieee80211_txrx_result
337 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data
*rx
)
339 struct ieee80211_local
*local
= rx
->local
;
340 struct sk_buff
*skb
= rx
->skb
;
342 if (unlikely(local
->sta_scanning
!= 0)) {
343 ieee80211_sta_rx_scan(rx
->dev
, skb
, rx
->u
.rx
.status
);
347 if (unlikely(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
)) {
348 /* scanning finished during invoking of handlers */
349 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
353 return TXRX_CONTINUE
;
356 static ieee80211_txrx_result
357 ieee80211_rx_h_check(struct ieee80211_txrx_data
*rx
)
359 struct ieee80211_hdr
*hdr
;
360 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
362 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
363 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
364 if (unlikely(rx
->fc
& IEEE80211_FCTL_RETRY
&&
365 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] ==
367 if (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
) {
368 rx
->local
->dot11FrameDuplicateCount
++;
369 rx
->sta
->num_duplicates
++;
373 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] = hdr
->seq_ctrl
;
376 if (unlikely(rx
->skb
->len
< 16)) {
377 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
381 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
382 rx
->skb
->pkt_type
= PACKET_OTHERHOST
;
383 else if (compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr1
) == 0)
384 rx
->skb
->pkt_type
= PACKET_HOST
;
385 else if (is_multicast_ether_addr(hdr
->addr1
)) {
386 if (is_broadcast_ether_addr(hdr
->addr1
))
387 rx
->skb
->pkt_type
= PACKET_BROADCAST
;
389 rx
->skb
->pkt_type
= PACKET_MULTICAST
;
391 rx
->skb
->pkt_type
= PACKET_OTHERHOST
;
393 /* Drop disallowed frame classes based on STA auth/assoc state;
394 * IEEE 802.11, Chap 5.5.
396 * 80211.o does filtering only based on association state, i.e., it
397 * drops Class 3 frames from not associated stations. hostapd sends
398 * deauth/disassoc frames when needed. In addition, hostapd is
399 * responsible for filtering on both auth and assoc states.
401 if (unlikely(((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
||
402 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
&&
403 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PSPOLL
)) &&
404 rx
->sdata
->type
!= IEEE80211_IF_TYPE_IBSS
&&
405 (!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_ASSOC
)))) {
406 if ((!(rx
->fc
& IEEE80211_FCTL_FROMDS
) &&
407 !(rx
->fc
& IEEE80211_FCTL_TODS
) &&
408 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)
409 || !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
410 /* Drop IBSS frames and frames for other hosts
415 if (!rx
->local
->apdev
)
418 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
419 ieee80211_msg_sta_not_assoc
);
423 return TXRX_CONTINUE
;
427 static ieee80211_txrx_result
428 ieee80211_rx_h_load_key(struct ieee80211_txrx_data
*rx
)
430 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
433 struct ieee80211_key
*stakey
= NULL
;
438 * There are three types of keys:
440 * - PTK (pairwise keys)
441 * - STK (station-to-station pairwise keys)
443 * When selecting a key, we have to distinguish between multicast
444 * (including broadcast) and unicast frames, the latter can only
445 * use PTKs and STKs while the former always use GTKs. Unless, of
446 * course, actual WEP keys ("pre-RSNA") are used, then unicast
447 * frames can also use key indizes like GTKs. Hence, if we don't
448 * have a PTK/STK we check the key index for a WEP key.
450 * Note that in a regular BSS, multicast frames are sent by the
451 * AP only, associated stations unicast the frame to the AP first
452 * which then multicasts it on their behalf.
454 * There is also a slight problem in IBSS mode: GTKs are negotiated
455 * with each station, that is something we don't currently handle.
456 * The spec seems to expect that one negotiates the same key with
457 * every station but there's no such requirement; VLANs could be
461 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
))
462 return TXRX_CONTINUE
;
465 * No point in finding a key if the frame is neither
466 * addressed to us nor a multicast frame.
468 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
469 return TXRX_CONTINUE
;
472 stakey
= rcu_dereference(rx
->sta
->key
);
474 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
478 * The device doesn't give us the IV so we won't be
479 * able to look up the key. That's ok though, we
480 * don't need to decrypt the frame, we just won't
481 * be able to keep statistics accurate.
482 * Except for key threshold notifications, should
483 * we somehow allow the driver to tell us which key
484 * the hardware used if this flag is set?
486 if ((rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
) &&
487 (rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
))
488 return TXRX_CONTINUE
;
490 hdrlen
= ieee80211_get_hdrlen(rx
->fc
);
492 if (rx
->skb
->len
< 8 + hdrlen
)
493 return TXRX_DROP
; /* TODO: count this? */
496 * no need to call ieee80211_wep_get_keyidx,
497 * it verifies a bunch of things we've done already
499 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
501 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
504 * RSNA-protected unicast frames should always be sent with
505 * pairwise or station-to-station keys, but for WEP we allow
506 * using a key index as well.
508 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
509 !is_multicast_ether_addr(hdr
->addr1
))
514 rx
->key
->tx_rx_count
++;
515 /* TODO: add threshold stuff again */
518 return TXRX_CONTINUE
;
521 static void ap_sta_ps_start(struct net_device
*dev
, struct sta_info
*sta
)
523 struct ieee80211_sub_if_data
*sdata
;
524 DECLARE_MAC_BUF(mac
);
526 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
529 atomic_inc(&sdata
->bss
->num_sta_ps
);
530 sta
->flags
|= WLAN_STA_PS
;
532 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
533 printk(KERN_DEBUG
"%s: STA %s aid %d enters power save mode\n",
534 dev
->name
, print_mac(mac
, sta
->addr
), sta
->aid
);
535 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
538 static int ap_sta_ps_end(struct net_device
*dev
, struct sta_info
*sta
)
540 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
543 struct ieee80211_sub_if_data
*sdata
;
544 struct ieee80211_tx_packet_data
*pkt_data
;
545 DECLARE_MAC_BUF(mac
);
547 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
549 atomic_dec(&sdata
->bss
->num_sta_ps
);
550 sta
->flags
&= ~(WLAN_STA_PS
| WLAN_STA_TIM
);
552 if (!skb_queue_empty(&sta
->ps_tx_buf
)) {
553 if (local
->ops
->set_tim
)
554 local
->ops
->set_tim(local_to_hw(local
), sta
->aid
, 0);
556 bss_tim_clear(local
, sdata
->bss
, sta
->aid
);
558 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
559 printk(KERN_DEBUG
"%s: STA %s aid %d exits power save mode\n",
560 dev
->name
, print_mac(mac
, sta
->addr
), sta
->aid
);
561 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
562 /* Send all buffered frames to the station */
563 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
564 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
566 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
569 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
570 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
571 local
->total_ps_buffered
--;
573 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
574 printk(KERN_DEBUG
"%s: STA %s aid %d send PS frame "
575 "since STA not sleeping anymore\n", dev
->name
,
576 print_mac(mac
, sta
->addr
), sta
->aid
);
577 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
578 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
585 static ieee80211_txrx_result
586 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data
*rx
)
588 struct sta_info
*sta
= rx
->sta
;
589 struct net_device
*dev
= rx
->dev
;
590 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
593 return TXRX_CONTINUE
;
595 /* Update last_rx only for IBSS packets which are for the current
596 * BSSID to avoid keeping the current IBSS network alive in cases where
597 * other STAs are using different BSSID. */
598 if (rx
->sdata
->type
== IEEE80211_IF_TYPE_IBSS
) {
599 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
);
600 if (compare_ether_addr(bssid
, rx
->sdata
->u
.sta
.bssid
) == 0)
601 sta
->last_rx
= jiffies
;
603 if (!is_multicast_ether_addr(hdr
->addr1
) ||
604 rx
->sdata
->type
== IEEE80211_IF_TYPE_STA
) {
605 /* Update last_rx only for unicast frames in order to prevent
606 * the Probe Request frames (the only broadcast frames from a
607 * STA in infrastructure mode) from keeping a connection alive.
609 sta
->last_rx
= jiffies
;
612 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
613 return TXRX_CONTINUE
;
616 sta
->rx_bytes
+= rx
->skb
->len
;
617 sta
->last_rssi
= rx
->u
.rx
.status
->ssi
;
618 sta
->last_signal
= rx
->u
.rx
.status
->signal
;
619 sta
->last_noise
= rx
->u
.rx
.status
->noise
;
621 if (!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
)) {
622 /* Change STA power saving mode only in the end of a frame
623 * exchange sequence */
624 if ((sta
->flags
& WLAN_STA_PS
) && !(rx
->fc
& IEEE80211_FCTL_PM
))
625 rx
->u
.rx
.sent_ps_buffered
+= ap_sta_ps_end(dev
, sta
);
626 else if (!(sta
->flags
& WLAN_STA_PS
) &&
627 (rx
->fc
& IEEE80211_FCTL_PM
))
628 ap_sta_ps_start(dev
, sta
);
631 /* Drop data::nullfunc frames silently, since they are used only to
632 * control station power saving mode. */
633 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
634 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_NULLFUNC
) {
635 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
636 /* Update counter and free packet here to avoid counting this
637 * as a dropped packed. */
639 dev_kfree_skb(rx
->skb
);
643 return TXRX_CONTINUE
;
644 } /* ieee80211_rx_h_sta_process */
646 static ieee80211_txrx_result
647 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data
*rx
)
649 if (!rx
->sta
|| !(rx
->fc
& IEEE80211_FCTL_PROTECTED
) ||
650 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
||
651 !rx
->key
|| rx
->key
->conf
.alg
!= ALG_WEP
||
652 !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
653 return TXRX_CONTINUE
;
655 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
656 if (!(rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
) ||
657 !(rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
))
658 if (ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
659 rx
->sta
->wep_weak_iv_count
++;
661 return TXRX_CONTINUE
;
664 static ieee80211_txrx_result
665 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data
*rx
)
667 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
))
668 return TXRX_CONTINUE
;
672 printk(KERN_DEBUG
"%s: RX protected frame,"
673 " but have no key\n", rx
->dev
->name
);
677 switch (rx
->key
->conf
.alg
) {
679 return ieee80211_crypto_wep_decrypt(rx
);
681 return ieee80211_crypto_tkip_decrypt(rx
);
683 return ieee80211_crypto_ccmp_decrypt(rx
);
685 return TXRX_CONTINUE
;
693 static inline struct ieee80211_fragment_entry
*
694 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
695 unsigned int frag
, unsigned int seq
, int rx_queue
,
696 struct sk_buff
**skb
)
698 struct ieee80211_fragment_entry
*entry
;
701 idx
= sdata
->fragment_next
;
702 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
703 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
704 sdata
->fragment_next
= 0;
706 if (!skb_queue_empty(&entry
->skb_list
)) {
707 #ifdef CONFIG_MAC80211_DEBUG
708 struct ieee80211_hdr
*hdr
=
709 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
710 DECLARE_MAC_BUF(mac
);
711 DECLARE_MAC_BUF(mac2
);
712 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
713 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
714 "addr1=%s addr2=%s\n",
715 sdata
->dev
->name
, idx
,
716 jiffies
- entry
->first_frag_time
, entry
->seq
,
717 entry
->last_frag
, print_mac(mac
, hdr
->addr1
),
718 print_mac(mac2
, hdr
->addr2
));
719 #endif /* CONFIG_MAC80211_DEBUG */
720 __skb_queue_purge(&entry
->skb_list
);
723 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
725 entry
->first_frag_time
= jiffies
;
727 entry
->rx_queue
= rx_queue
;
728 entry
->last_frag
= frag
;
730 entry
->extra_len
= 0;
735 static inline struct ieee80211_fragment_entry
*
736 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
737 u16 fc
, unsigned int frag
, unsigned int seq
,
738 int rx_queue
, struct ieee80211_hdr
*hdr
)
740 struct ieee80211_fragment_entry
*entry
;
743 idx
= sdata
->fragment_next
;
744 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
745 struct ieee80211_hdr
*f_hdr
;
750 idx
= IEEE80211_FRAGMENT_MAX
- 1;
752 entry
= &sdata
->fragments
[idx
];
753 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
754 entry
->rx_queue
!= rx_queue
||
755 entry
->last_frag
+ 1 != frag
)
758 f_hdr
= (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
759 f_fc
= le16_to_cpu(f_hdr
->frame_control
);
761 if ((fc
& IEEE80211_FCTL_FTYPE
) != (f_fc
& IEEE80211_FCTL_FTYPE
) ||
762 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
763 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
766 if (entry
->first_frag_time
+ 2 * HZ
< jiffies
) {
767 __skb_queue_purge(&entry
->skb_list
);
776 static ieee80211_txrx_result
777 ieee80211_rx_h_defragment(struct ieee80211_txrx_data
*rx
)
779 struct ieee80211_hdr
*hdr
;
781 unsigned int frag
, seq
;
782 struct ieee80211_fragment_entry
*entry
;
784 DECLARE_MAC_BUF(mac
);
786 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
787 sc
= le16_to_cpu(hdr
->seq_ctrl
);
788 frag
= sc
& IEEE80211_SCTL_FRAG
;
790 if (likely((!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) && frag
== 0) ||
791 (rx
->skb
)->len
< 24 ||
792 is_multicast_ether_addr(hdr
->addr1
))) {
796 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
798 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
801 /* This is the first fragment of a new frame. */
802 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
803 rx
->u
.rx
.queue
, &(rx
->skb
));
804 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
805 (rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
806 /* Store CCMP PN so that we can verify that the next
807 * fragment has a sequential PN value. */
809 memcpy(entry
->last_pn
,
810 rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
],
816 /* This is a fragment for a frame that should already be pending in
817 * fragment cache. Add this fragment to the end of the pending entry.
819 entry
= ieee80211_reassemble_find(rx
->sdata
, rx
->fc
, frag
, seq
,
820 rx
->u
.rx
.queue
, hdr
);
822 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
826 /* Verify that MPDUs within one MSDU have sequential PN values.
827 * (IEEE 802.11i, 8.3.3.4.5) */
830 u8 pn
[CCMP_PN_LEN
], *rpn
;
831 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
833 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
834 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
839 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
];
840 if (memcmp(pn
, rpn
, CCMP_PN_LEN
) != 0) {
842 printk(KERN_DEBUG
"%s: defrag: CCMP PN not "
844 " PN=%02x%02x%02x%02x%02x%02x "
845 "(expected %02x%02x%02x%02x%02x%02x)\n",
846 rx
->dev
->name
, print_mac(mac
, hdr
->addr2
),
847 rpn
[0], rpn
[1], rpn
[2], rpn
[3], rpn
[4],
848 rpn
[5], pn
[0], pn
[1], pn
[2], pn
[3],
852 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
855 skb_pull(rx
->skb
, ieee80211_get_hdrlen(rx
->fc
));
856 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
857 entry
->last_frag
= frag
;
858 entry
->extra_len
+= rx
->skb
->len
;
859 if (rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) {
864 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
865 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
866 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
867 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
869 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
870 __skb_queue_purge(&entry
->skb_list
);
874 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
875 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
879 /* Complete frame has been reassembled - process it now */
880 rx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
884 rx
->sta
->rx_packets
++;
885 if (is_multicast_ether_addr(hdr
->addr1
))
886 rx
->local
->dot11MulticastReceivedFrameCount
++;
888 ieee80211_led_rx(rx
->local
);
889 return TXRX_CONTINUE
;
892 static ieee80211_txrx_result
893 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data
*rx
)
897 DECLARE_MAC_BUF(mac
);
899 if (likely(!rx
->sta
||
900 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_CTL
||
901 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PSPOLL
||
902 !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)))
903 return TXRX_CONTINUE
;
905 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
907 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
909 rx
->local
->total_ps_buffered
--;
911 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
912 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
915 struct ieee80211_hdr
*hdr
=
916 (struct ieee80211_hdr
*) skb
->data
;
918 /* tell TX path to send one frame even though the STA may
919 * still remain is PS mode after this frame exchange */
922 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
923 printk(KERN_DEBUG
"STA %s aid %d: PS Poll (entries after %d)\n",
924 print_mac(mac
, rx
->sta
->addr
), rx
->sta
->aid
,
925 skb_queue_len(&rx
->sta
->ps_tx_buf
));
926 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
928 /* Use MoreData flag to indicate whether there are more
929 * buffered frames for this STA */
930 if (no_pending_pkts
) {
931 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
932 rx
->sta
->flags
&= ~WLAN_STA_TIM
;
934 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
938 if (no_pending_pkts
) {
939 if (rx
->local
->ops
->set_tim
)
940 rx
->local
->ops
->set_tim(local_to_hw(rx
->local
),
943 bss_tim_clear(rx
->local
, rx
->sdata
->bss
, rx
->sta
->aid
);
945 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
946 } else if (!rx
->u
.rx
.sent_ps_buffered
) {
947 printk(KERN_DEBUG
"%s: STA %s sent PS Poll even "
948 "though there is no buffered frames for it\n",
949 rx
->dev
->name
, print_mac(mac
, rx
->sta
->addr
));
950 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
954 /* Free PS Poll skb here instead of returning TXRX_DROP that would
955 * count as an dropped frame. */
956 dev_kfree_skb(rx
->skb
);
961 static ieee80211_txrx_result
962 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data
*rx
)
965 u8
*data
= rx
->skb
->data
;
966 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) data
;
968 if (!WLAN_FC_IS_QOS_DATA(fc
))
969 return TXRX_CONTINUE
;
971 /* remove the qos control field, update frame type and meta-data */
972 memmove(data
+ 2, data
, ieee80211_get_hdrlen(fc
) - 2);
973 hdr
= (struct ieee80211_hdr
*) skb_pull(rx
->skb
, 2);
974 /* change frame type to non QOS */
975 rx
->fc
= fc
&= ~IEEE80211_STYPE_QOS_DATA
;
976 hdr
->frame_control
= cpu_to_le16(fc
);
978 return TXRX_CONTINUE
;
981 static ieee80211_txrx_result
982 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data
*rx
)
984 if (rx
->sdata
->eapol
&& ieee80211_is_eapol(rx
->skb
) &&
985 rx
->sdata
->type
!= IEEE80211_IF_TYPE_STA
&&
986 (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
987 /* Pass both encrypted and unencrypted EAPOL frames to user
988 * space for processing. */
989 if (!rx
->local
->apdev
)
991 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
992 ieee80211_msg_normal
);
996 if (unlikely(rx
->sdata
->ieee802_1x
&&
997 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
998 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_NULLFUNC
&&
999 (!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_AUTHORIZED
)) &&
1000 !ieee80211_is_eapol(rx
->skb
))) {
1001 #ifdef CONFIG_MAC80211_DEBUG
1002 struct ieee80211_hdr
*hdr
=
1003 (struct ieee80211_hdr
*) rx
->skb
->data
;
1004 DECLARE_MAC_BUF(mac
);
1005 printk(KERN_DEBUG
"%s: dropped frame from %s"
1006 " (unauthorized port)\n", rx
->dev
->name
,
1007 print_mac(mac
, hdr
->addr2
));
1008 #endif /* CONFIG_MAC80211_DEBUG */
1012 return TXRX_CONTINUE
;
1015 static ieee80211_txrx_result
1016 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data
*rx
)
1019 * Pass through unencrypted frames if the hardware has
1020 * decrypted them already.
1022 if (rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
)
1023 return TXRX_CONTINUE
;
1025 /* Drop unencrypted frames if key is set. */
1026 if (unlikely(!(rx
->fc
& IEEE80211_FCTL_PROTECTED
) &&
1027 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
1028 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_NULLFUNC
&&
1029 (rx
->key
|| rx
->sdata
->drop_unencrypted
) &&
1030 (rx
->sdata
->eapol
== 0 ||
1031 !ieee80211_is_eapol(rx
->skb
)))) {
1032 if (net_ratelimit())
1033 printk(KERN_DEBUG
"%s: RX non-WEP frame, but expected "
1034 "encryption\n", rx
->dev
->name
);
1037 return TXRX_CONTINUE
;
1040 static ieee80211_txrx_result
1041 ieee80211_rx_h_data(struct ieee80211_txrx_data
*rx
)
1043 struct net_device
*dev
= rx
->dev
;
1044 struct ieee80211_local
*local
= rx
->local
;
1045 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
1046 u16 fc
, hdrlen
, ethertype
;
1050 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1051 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1052 DECLARE_MAC_BUF(mac
);
1053 DECLARE_MAC_BUF(mac2
);
1054 DECLARE_MAC_BUF(mac3
);
1055 DECLARE_MAC_BUF(mac4
);
1058 if (unlikely((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
))
1059 return TXRX_CONTINUE
;
1061 if (unlikely(!WLAN_FC_DATA_PRESENT(fc
)))
1064 hdrlen
= ieee80211_get_hdrlen(fc
);
1066 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1068 * IEEE 802.11 address fields:
1069 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1070 * 0 0 DA SA BSSID n/a
1071 * 0 1 DA BSSID SA n/a
1072 * 1 0 BSSID SA DA n/a
1076 switch (fc
& (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
1077 case IEEE80211_FCTL_TODS
:
1079 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
1080 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
1082 if (unlikely(sdata
->type
!= IEEE80211_IF_TYPE_AP
&&
1083 sdata
->type
!= IEEE80211_IF_TYPE_VLAN
)) {
1084 if (net_ratelimit())
1085 printk(KERN_DEBUG
"%s: dropped ToDS frame "
1086 "(BSSID=%s SA=%s DA=%s)\n",
1088 print_mac(mac
, hdr
->addr1
),
1089 print_mac(mac2
, hdr
->addr2
),
1090 print_mac(mac3
, hdr
->addr3
));
1094 case (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
1096 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
1097 memcpy(src
, hdr
->addr4
, ETH_ALEN
);
1099 if (unlikely(sdata
->type
!= IEEE80211_IF_TYPE_WDS
)) {
1100 if (net_ratelimit())
1101 printk(KERN_DEBUG
"%s: dropped FromDS&ToDS "
1102 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1104 print_mac(mac
, hdr
->addr1
),
1105 print_mac(mac2
, hdr
->addr2
),
1106 print_mac(mac3
, hdr
->addr3
),
1107 print_mac(mac4
, hdr
->addr4
));
1111 case IEEE80211_FCTL_FROMDS
:
1113 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
1114 memcpy(src
, hdr
->addr3
, ETH_ALEN
);
1116 if (sdata
->type
!= IEEE80211_IF_TYPE_STA
||
1117 (is_multicast_ether_addr(dst
) &&
1118 !compare_ether_addr(src
, dev
->dev_addr
)))
1123 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
1124 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
1126 if (sdata
->type
!= IEEE80211_IF_TYPE_IBSS
) {
1127 if (net_ratelimit()) {
1128 printk(KERN_DEBUG
"%s: dropped IBSS frame "
1129 "(DA=%s SA=%s BSSID=%s)\n",
1131 print_mac(mac
, hdr
->addr1
),
1132 print_mac(mac2
, hdr
->addr2
),
1133 print_mac(mac3
, hdr
->addr3
));
1140 payload
= skb
->data
+ hdrlen
;
1142 if (unlikely(skb
->len
- hdrlen
< 8)) {
1143 if (net_ratelimit()) {
1144 printk(KERN_DEBUG
"%s: RX too short data frame "
1145 "payload\n", dev
->name
);
1150 ethertype
= (payload
[6] << 8) | payload
[7];
1152 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1153 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1154 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1155 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1156 * replace EtherType */
1157 skb_pull(skb
, hdrlen
+ 6);
1158 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1159 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1161 struct ethhdr
*ehdr
;
1163 skb_pull(skb
, hdrlen
);
1164 len
= htons(skb
->len
);
1165 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1166 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1167 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1168 ehdr
->h_proto
= len
;
1174 dev
->stats
.rx_packets
++;
1175 dev
->stats
.rx_bytes
+= skb
->len
;
1177 if (local
->bridge_packets
&& (sdata
->type
== IEEE80211_IF_TYPE_AP
1178 || sdata
->type
== IEEE80211_IF_TYPE_VLAN
) &&
1179 (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
1180 if (is_multicast_ether_addr(skb
->data
)) {
1181 /* send multicast frames both to higher layers in
1182 * local net stack and back to the wireless media */
1183 skb2
= skb_copy(skb
, GFP_ATOMIC
);
1184 if (!skb2
&& net_ratelimit())
1185 printk(KERN_DEBUG
"%s: failed to clone "
1186 "multicast frame\n", dev
->name
);
1188 struct sta_info
*dsta
;
1189 dsta
= sta_info_get(local
, skb
->data
);
1190 if (dsta
&& !dsta
->dev
) {
1191 if (net_ratelimit())
1192 printk(KERN_DEBUG
"Station with null "
1193 "dev structure!\n");
1194 } else if (dsta
&& dsta
->dev
== dev
) {
1195 /* Destination station is associated to this
1196 * AP, so send the frame directly to it and
1197 * do not pass the frame to local net stack.
1208 /* deliver to local stack */
1209 skb
->protocol
= eth_type_trans(skb
, dev
);
1210 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1215 /* send to wireless media */
1216 skb2
->protocol
= __constant_htons(ETH_P_802_3
);
1217 skb_set_network_header(skb2
, 0);
1218 skb_set_mac_header(skb2
, 0);
1219 dev_queue_xmit(skb2
);
1225 static ieee80211_txrx_result
1226 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data
*rx
)
1228 struct ieee80211_sub_if_data
*sdata
;
1230 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
1233 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1234 if ((sdata
->type
== IEEE80211_IF_TYPE_STA
||
1235 sdata
->type
== IEEE80211_IF_TYPE_IBSS
) &&
1236 !rx
->local
->user_space_mlme
) {
1237 ieee80211_sta_rx_mgmt(rx
->dev
, rx
->skb
, rx
->u
.rx
.status
);
1239 /* Management frames are sent to hostapd for processing */
1240 if (!rx
->local
->apdev
)
1242 ieee80211_rx_mgmt(rx
->local
, rx
->skb
, rx
->u
.rx
.status
,
1243 ieee80211_msg_normal
);
1248 static inline ieee80211_txrx_result
__ieee80211_invoke_rx_handlers(
1249 struct ieee80211_local
*local
,
1250 ieee80211_rx_handler
*handlers
,
1251 struct ieee80211_txrx_data
*rx
,
1252 struct sta_info
*sta
)
1254 ieee80211_rx_handler
*handler
;
1255 ieee80211_txrx_result res
= TXRX_DROP
;
1257 for (handler
= handlers
; *handler
!= NULL
; handler
++) {
1258 res
= (*handler
)(rx
);
1264 I802_DEBUG_INC(local
->rx_handlers_drop
);
1269 I802_DEBUG_INC(local
->rx_handlers_queued
);
1275 if (res
== TXRX_DROP
)
1276 dev_kfree_skb(rx
->skb
);
1280 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local
*local
,
1281 ieee80211_rx_handler
*handlers
,
1282 struct ieee80211_txrx_data
*rx
,
1283 struct sta_info
*sta
)
1285 if (__ieee80211_invoke_rx_handlers(local
, handlers
, rx
, sta
) ==
1287 dev_kfree_skb(rx
->skb
);
1290 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1291 struct ieee80211_hdr
*hdr
,
1292 struct sta_info
*sta
,
1293 struct ieee80211_txrx_data
*rx
)
1296 DECLARE_MAC_BUF(mac
);
1297 DECLARE_MAC_BUF(mac2
);
1299 hdrlen
= ieee80211_get_hdrlen_from_skb(rx
->skb
);
1300 if (rx
->skb
->len
>= hdrlen
+ 4)
1301 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1305 if (net_ratelimit())
1306 printk(KERN_DEBUG
"%s: TKIP hwaccel reported Michael MIC "
1307 "failure from %s to %s keyidx=%d\n",
1308 dev
->name
, print_mac(mac
, hdr
->addr2
),
1309 print_mac(mac2
, hdr
->addr1
), keyidx
);
1313 * Some hardware seem to generate incorrect Michael MIC
1314 * reports; ignore them to avoid triggering countermeasures.
1316 if (net_ratelimit())
1317 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1318 "error for unknown address %s\n",
1319 dev
->name
, print_mac(mac
, hdr
->addr2
));
1323 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
1324 if (net_ratelimit())
1325 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1326 "error for a frame with no PROTECTED flag (src "
1327 "%s)\n", dev
->name
, print_mac(mac
, hdr
->addr2
));
1331 if (rx
->sdata
->type
== IEEE80211_IF_TYPE_AP
&& keyidx
) {
1333 * APs with pairwise keys should never receive Michael MIC
1334 * errors for non-zero keyidx because these are reserved for
1335 * group keys and only the AP is sending real multicast
1336 * frames in the BSS.
1338 if (net_ratelimit())
1339 printk(KERN_DEBUG
"%s: ignored Michael MIC error for "
1340 "a frame with non-zero keyidx (%d)"
1341 " (src %s)\n", dev
->name
, keyidx
,
1342 print_mac(mac
, hdr
->addr2
));
1346 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
1347 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
1348 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)) {
1349 if (net_ratelimit())
1350 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1351 "error for a frame that cannot be encrypted "
1352 "(fc=0x%04x) (src %s)\n",
1353 dev
->name
, rx
->fc
, print_mac(mac
, hdr
->addr2
));
1357 mac80211_ev_michael_mic_failure(rx
->dev
, keyidx
, hdr
);
1359 dev_kfree_skb(rx
->skb
);
1363 ieee80211_rx_handler ieee80211_rx_handlers
[] =
1365 ieee80211_rx_h_if_stats
,
1366 ieee80211_rx_h_passive_scan
,
1367 ieee80211_rx_h_check
,
1368 ieee80211_rx_h_load_key
,
1369 ieee80211_rx_h_sta_process
,
1370 ieee80211_rx_h_wep_weak_iv_detection
,
1371 ieee80211_rx_h_decrypt
,
1372 ieee80211_rx_h_defragment
,
1373 ieee80211_rx_h_ps_poll
,
1374 ieee80211_rx_h_michael_mic_verify
,
1375 /* this must be after decryption - so header is counted in MPDU mic
1376 * must be before pae and data, so QOS_DATA format frames
1377 * are not passed to user space by these functions
1379 ieee80211_rx_h_remove_qos_control
,
1380 ieee80211_rx_h_802_1x_pae
,
1381 ieee80211_rx_h_drop_unencrypted
,
1382 ieee80211_rx_h_data
,
1383 ieee80211_rx_h_mgmt
,
1387 /* main receive path */
1389 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
1390 u8
*bssid
, struct ieee80211_txrx_data
*rx
,
1391 struct ieee80211_hdr
*hdr
)
1393 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
1395 switch (sdata
->type
) {
1396 case IEEE80211_IF_TYPE_STA
:
1399 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1400 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1402 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1403 } else if (!multicast
&&
1404 compare_ether_addr(sdata
->dev
->dev_addr
,
1406 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
1408 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1411 case IEEE80211_IF_TYPE_IBSS
:
1414 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1415 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1417 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1418 } else if (!multicast
&&
1419 compare_ether_addr(sdata
->dev
->dev_addr
,
1421 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
1423 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1424 } else if (!rx
->sta
)
1425 rx
->sta
= ieee80211_ibss_add_sta(sdata
->dev
, rx
->skb
,
1428 case IEEE80211_IF_TYPE_AP
:
1430 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1433 } else if (!ieee80211_bssid_match(bssid
,
1434 sdata
->dev
->dev_addr
)) {
1435 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1437 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1439 if (sdata
->dev
== sdata
->local
->mdev
&&
1440 !(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1441 /* do not receive anything via
1442 * master device when not scanning */
1445 case IEEE80211_IF_TYPE_WDS
:
1447 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
)
1449 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
1458 * This is the receive path handler. It is called by a low level driver when an
1459 * 802.11 MPDU is received from the hardware.
1461 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
1462 struct ieee80211_rx_status
*status
)
1464 struct ieee80211_local
*local
= hw_to_local(hw
);
1465 struct ieee80211_sub_if_data
*sdata
;
1466 struct sta_info
*sta
;
1467 struct ieee80211_hdr
*hdr
;
1468 struct ieee80211_txrx_data rx
;
1471 struct ieee80211_sub_if_data
*prev
= NULL
;
1472 struct sk_buff
*skb_new
;
1476 * key references and virtual interfaces are protected using RCU
1477 * and this requires that we are in a read-side RCU section during
1478 * receive processing
1483 * Frames with failed FCS/PLCP checksum are not returned,
1484 * all other frames are returned without radiotap header
1485 * if it was previously present.
1486 * Also, frames with less than 16 bytes are dropped.
1488 skb
= ieee80211_rx_monitor(local
, skb
, status
);
1494 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1495 memset(&rx
, 0, sizeof(rx
));
1499 rx
.u
.rx
.status
= status
;
1500 rx
.fc
= le16_to_cpu(hdr
->frame_control
);
1501 type
= rx
.fc
& IEEE80211_FCTL_FTYPE
;
1503 if (type
== IEEE80211_FTYPE_DATA
|| type
== IEEE80211_FTYPE_MGMT
)
1504 local
->dot11ReceivedFragmentCount
++;
1506 sta
= rx
.sta
= sta_info_get(local
, hdr
->addr2
);
1508 rx
.dev
= rx
.sta
->dev
;
1509 rx
.sdata
= IEEE80211_DEV_TO_SUB_IF(rx
.dev
);
1512 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
1513 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, sta
, &rx
);
1517 if (unlikely(local
->sta_scanning
))
1518 rx
.flags
|= IEEE80211_TXRXD_RXIN_SCAN
;
1520 if (__ieee80211_invoke_rx_handlers(local
, local
->rx_pre_handlers
, &rx
,
1521 sta
) != TXRX_CONTINUE
)
1525 if (sta
&& !(sta
->flags
& (WLAN_STA_WDS
| WLAN_STA_ASSOC_AP
)) &&
1526 !local
->iff_promiscs
&& !is_multicast_ether_addr(hdr
->addr1
)) {
1527 rx
.flags
|= IEEE80211_TXRXD_RXRA_MATCH
;
1528 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
, &rx
,
1535 bssid
= ieee80211_get_bssid(hdr
, skb
->len
);
1537 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1538 if (!netif_running(sdata
->dev
))
1541 if (sdata
->type
== IEEE80211_IF_TYPE_MNTR
)
1544 rx
.flags
|= IEEE80211_TXRXD_RXRA_MATCH
;
1545 prepres
= prepare_for_handlers(sdata
, bssid
, &rx
, hdr
);
1546 /* prepare_for_handlers can change sta */
1553 * frame is destined for this interface, but if it's not
1554 * also for the previous one we handle that after the
1555 * loop to avoid copying the SKB once too much
1564 * frame was destined for the previous interface
1565 * so invoke RX handlers for it
1568 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
1570 if (net_ratelimit())
1571 printk(KERN_DEBUG
"%s: failed to copy "
1572 "multicast frame for %s",
1573 wiphy_name(local
->hw
.wiphy
),
1580 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
,
1588 ieee80211_invoke_rx_handlers(local
, local
->rx_handlers
,
1599 EXPORT_SYMBOL(__ieee80211_rx
);
1601 /* This is a version of the rx handler that can be called from hard irq
1602 * context. Post the skb on the queue and schedule the tasklet */
1603 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
1604 struct ieee80211_rx_status
*status
)
1606 struct ieee80211_local
*local
= hw_to_local(hw
);
1608 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
1610 skb
->dev
= local
->mdev
;
1611 /* copy status into skb->cb for use by tasklet */
1612 memcpy(skb
->cb
, status
, sizeof(*status
));
1613 skb
->pkt_type
= IEEE80211_RX_MSG
;
1614 skb_queue_tail(&local
->skb_queue
, skb
);
1615 tasklet_schedule(&local
->tasklet
);
1617 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);