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/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "ieee80211_led.h"
29 u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
30 struct tid_ampdu_rx
*tid_agg_rx
,
31 struct sk_buff
*skb
, u16 mpdu_seq_num
,
34 * monitor mode reception
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
39 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
43 skb_pull(skb
, rtap_len
);
45 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
46 if (likely(skb
->len
> FCS_LEN
))
47 skb_trim(skb
, skb
->len
- FCS_LEN
);
59 static inline int should_drop_frame(struct ieee80211_rx_status
*status
,
64 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
66 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
68 if (unlikely(skb
->len
< 16 + present_fcs_len
+ radiotap_len
))
70 if (((hdr
->frame_control
& cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ==
71 cpu_to_le16(IEEE80211_FTYPE_CTL
)) &&
72 ((hdr
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
)) !=
73 cpu_to_le16(IEEE80211_STYPE_PSPOLL
)) &&
74 ((hdr
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
)) !=
75 cpu_to_le16(IEEE80211_STYPE_BACK_REQ
)))
81 * This function copies a received frame to all monitor interfaces and
82 * returns a cleaned-up SKB that no longer includes the FCS nor the
83 * radiotap header the driver might have added.
85 static struct sk_buff
*
86 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
87 struct ieee80211_rx_status
*status
,
88 struct ieee80211_rate
*rate
)
90 struct ieee80211_sub_if_data
*sdata
;
91 int needed_headroom
= 0;
92 struct ieee80211_radiotap_header
*rthdr
;
93 __le64
*rttsft
= NULL
;
94 struct ieee80211_rtap_fixed_data
{
100 u8 padding_for_rxflags
;
102 } __attribute__ ((packed
)) *rtfixed
;
103 struct sk_buff
*skb
, *skb2
;
104 struct net_device
*prev_dev
= NULL
;
105 int present_fcs_len
= 0;
109 * First, we may need to make a copy of the skb because
110 * (1) we need to modify it for radiotap (if not present), and
111 * (2) the other RX handlers will modify the skb we got.
113 * We don't need to, of course, if we aren't going to return
114 * the SKB because it has a bad FCS/PLCP checksum.
116 if (status
->flag
& RX_FLAG_RADIOTAP
)
117 rtap_len
= ieee80211_get_radiotap_len(origskb
->data
);
119 /* room for radiotap header, always present fields and TSFT */
120 needed_headroom
= sizeof(*rthdr
) + sizeof(*rtfixed
) + 8;
122 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
123 present_fcs_len
= FCS_LEN
;
125 if (!local
->monitors
) {
126 if (should_drop_frame(status
, origskb
, present_fcs_len
,
128 dev_kfree_skb(origskb
);
132 return remove_monitor_info(local
, origskb
, rtap_len
);
135 if (should_drop_frame(status
, origskb
, present_fcs_len
, rtap_len
)) {
136 /* only need to expand headroom if necessary */
141 * This shouldn't trigger often because most devices have an
142 * RX header they pull before we get here, and that should
143 * be big enough for our radiotap information. We should
144 * probably export the length to drivers so that we can have
145 * them allocate enough headroom to start with.
147 if (skb_headroom(skb
) < needed_headroom
&&
148 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
154 * Need to make a copy and possibly remove radiotap header
155 * and FCS from the original.
157 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
159 origskb
= remove_monitor_info(local
, origskb
, rtap_len
);
165 /* if necessary, prepend radiotap information */
166 if (!(status
->flag
& RX_FLAG_RADIOTAP
)) {
167 rtfixed
= (void *) skb_push(skb
, sizeof(*rtfixed
));
168 rtap_len
= sizeof(*rthdr
) + sizeof(*rtfixed
);
169 if (status
->flag
& RX_FLAG_TSFT
) {
170 rttsft
= (void *) skb_push(skb
, sizeof(*rttsft
));
173 rthdr
= (void *) skb_push(skb
, sizeof(*rthdr
));
174 memset(rthdr
, 0, sizeof(*rthdr
));
175 memset(rtfixed
, 0, sizeof(*rtfixed
));
177 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
178 (1 << IEEE80211_RADIOTAP_RATE
) |
179 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
180 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL
) |
181 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
183 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
184 rtfixed
->flags
|= IEEE80211_RADIOTAP_F_FCS
;
187 *rttsft
= cpu_to_le64(status
->mactime
);
189 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
192 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
193 rtfixed
->rx_flags
= 0;
195 (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
197 cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS
);
199 rtfixed
->rate
= rate
->bitrate
/ 5;
201 rtfixed
->chan_freq
= cpu_to_le16(status
->freq
);
203 if (status
->band
== IEEE80211_BAND_5GHZ
)
204 rtfixed
->chan_flags
=
205 cpu_to_le16(IEEE80211_CHAN_OFDM
|
206 IEEE80211_CHAN_5GHZ
);
208 rtfixed
->chan_flags
=
209 cpu_to_le16(IEEE80211_CHAN_DYN
|
210 IEEE80211_CHAN_2GHZ
);
212 rtfixed
->antsignal
= status
->ssi
;
213 rthdr
->it_len
= cpu_to_le16(rtap_len
);
216 skb_reset_mac_header(skb
);
217 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
218 skb
->pkt_type
= PACKET_OTHERHOST
;
219 skb
->protocol
= htons(ETH_P_802_2
);
221 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
222 if (!netif_running(sdata
->dev
))
225 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_MNTR
)
228 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
232 skb2
= skb_clone(skb
, GFP_ATOMIC
);
234 skb2
->dev
= prev_dev
;
239 prev_dev
= sdata
->dev
;
240 sdata
->dev
->stats
.rx_packets
++;
241 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
254 static void ieee80211_parse_qos(struct ieee80211_txrx_data
*rx
)
256 u8
*data
= rx
->skb
->data
;
259 /* does the frame have a qos control field? */
260 if (WLAN_FC_IS_QOS_DATA(rx
->fc
)) {
261 u8
*qc
= data
+ ieee80211_get_hdrlen(rx
->fc
) - QOS_CONTROL_LEN
;
262 /* frame has qos control */
263 tid
= qc
[0] & QOS_CONTROL_TID_MASK
;
264 if (qc
[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
265 rx
->flags
|= IEEE80211_TXRXD_RX_AMSDU
;
267 rx
->flags
&= ~IEEE80211_TXRXD_RX_AMSDU
;
269 if (unlikely((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
)) {
270 /* Separate TID for management frames */
271 tid
= NUM_RX_DATA_QUEUES
- 1;
273 /* no qos control present */
274 tid
= 0; /* 802.1d - Best Effort */
278 I802_DEBUG_INC(rx
->local
->wme_rx_queue
[tid
]);
279 /* only a debug counter, sta might not be assigned properly yet */
281 I802_DEBUG_INC(rx
->sta
->wme_rx_queue
[tid
]);
283 rx
->u
.rx
.queue
= tid
;
284 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
285 * For now, set skb->priority to 0 for other cases. */
286 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
289 static void ieee80211_verify_ip_alignment(struct ieee80211_txrx_data
*rx
)
291 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
294 if (!WLAN_FC_DATA_PRESENT(rx
->fc
))
298 * Drivers are required to align the payload data in a way that
299 * guarantees that the contained IP header is aligned to a four-
300 * byte boundary. In the case of regular frames, this simply means
301 * aligning the payload to a four-byte boundary (because either
302 * the IP header is directly contained, or IV/RFC1042 headers that
303 * have a length divisible by four are in front of it.
305 * With A-MSDU frames, however, the payload data address must
306 * yield two modulo four because there are 14-byte 802.3 headers
307 * within the A-MSDU frames that push the IP header further back
308 * to a multiple of four again. Thankfully, the specs were sane
309 * enough this time around to require padding each A-MSDU subframe
310 * to a length that is a multiple of four.
312 * Padding like atheros hardware adds which is inbetween the 802.11
313 * header and the payload is not supported, the driver is required
314 * to move the 802.11 header further back in that case.
316 hdrlen
= ieee80211_get_hdrlen(rx
->fc
);
317 if (rx
->flags
& IEEE80211_TXRXD_RX_AMSDU
)
319 WARN_ON_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3);
324 static u32
ieee80211_rx_load_stats(struct ieee80211_local
*local
,
326 struct ieee80211_rx_status
*status
,
327 struct ieee80211_rate
*rate
)
329 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
330 u32 load
= 0, hdrtime
;
332 /* Estimate total channel use caused by this frame */
334 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
335 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
337 if (status
->band
== IEEE80211_BAND_5GHZ
||
338 (status
->band
== IEEE80211_BAND_5GHZ
&&
339 rate
->flags
& IEEE80211_RATE_ERP_G
))
340 hdrtime
= CHAN_UTIL_HDR_SHORT
;
342 hdrtime
= CHAN_UTIL_HDR_LONG
;
345 if (!is_multicast_ether_addr(hdr
->addr1
))
348 /* TODO: optimise again */
349 load
+= skb
->len
* CHAN_UTIL_RATE_LCM
/ rate
->bitrate
;
351 /* Divide channel_use by 8 to avoid wrapping around the counter */
352 load
>>= CHAN_UTIL_SHIFT
;
359 static ieee80211_rx_result
360 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data
*rx
)
363 rx
->sta
->channel_use_raw
+= rx
->u
.rx
.load
;
364 rx
->sdata
->channel_use_raw
+= rx
->u
.rx
.load
;
368 static ieee80211_rx_result
369 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data
*rx
)
371 struct ieee80211_local
*local
= rx
->local
;
372 struct sk_buff
*skb
= rx
->skb
;
374 if (unlikely(local
->sta_hw_scanning
))
375 return ieee80211_sta_rx_scan(rx
->dev
, skb
, rx
->u
.rx
.status
);
377 if (unlikely(local
->sta_sw_scanning
)) {
378 /* drop all the other packets during a software scan anyway */
379 if (ieee80211_sta_rx_scan(rx
->dev
, skb
, rx
->u
.rx
.status
)
385 if (unlikely(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
)) {
386 /* scanning finished during invoking of handlers */
387 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
388 return RX_DROP_UNUSABLE
;
394 #ifdef CONFIG_MAC80211_MESH
395 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
396 static ieee80211_rx_result
397 ieee80211_rx_mesh_check(struct ieee80211_txrx_data
*rx
)
399 int hdrlen
= ieee80211_get_hdrlen(rx
->fc
);
400 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
401 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) {
402 if (!((rx
->fc
& IEEE80211_FCTL_FROMDS
) &&
403 (rx
->fc
& IEEE80211_FCTL_TODS
)))
404 return RX_DROP_MONITOR
;
405 if (memcmp(hdr
->addr4
, rx
->dev
->dev_addr
, ETH_ALEN
) == 0)
406 return RX_DROP_MONITOR
;
409 /* If there is not an established peer link and this is not a peer link
410 * establisment frame, beacon or probe, drop the frame.
413 if (!rx
->sta
|| rx
->sta
->plink_state
!= ESTAB
) {
414 struct ieee80211_mgmt
*mgmt
;
415 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
)
416 return RX_DROP_MONITOR
;
418 switch (rx
->fc
& IEEE80211_FCTL_STYPE
) {
419 case IEEE80211_STYPE_ACTION
:
420 mgmt
= (struct ieee80211_mgmt
*)hdr
;
421 if (mgmt
->u
.action
.category
!= PLINK_CATEGORY
)
422 return RX_DROP_MONITOR
;
423 /* fall through on else */
424 case IEEE80211_STYPE_PROBE_REQ
:
425 case IEEE80211_STYPE_PROBE_RESP
:
426 case IEEE80211_STYPE_BEACON
:
430 return RX_DROP_MONITOR
;
433 } else if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
434 is_broadcast_ether_addr(hdr
->addr1
) &&
435 mesh_rmc_check(hdr
->addr4
, msh_h_get(hdr
, hdrlen
), rx
->dev
))
436 return RX_DROP_MONITOR
;
442 static inline ieee80211_rx_result
443 ieee80211_rx_mesh_check(struct ieee80211_txrx_data
*rx
)
450 static ieee80211_rx_result
451 ieee80211_rx_h_check(struct ieee80211_txrx_data
*rx
)
453 struct ieee80211_hdr
*hdr
;
455 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
457 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
458 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
459 if (unlikely(rx
->fc
& IEEE80211_FCTL_RETRY
&&
460 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] ==
462 if (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
) {
463 rx
->local
->dot11FrameDuplicateCount
++;
464 rx
->sta
->num_duplicates
++;
466 return RX_DROP_MONITOR
;
468 rx
->sta
->last_seq_ctrl
[rx
->u
.rx
.queue
] = hdr
->seq_ctrl
;
471 if (unlikely(rx
->skb
->len
< 16)) {
472 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
473 return RX_DROP_MONITOR
;
476 /* Drop disallowed frame classes based on STA auth/assoc state;
477 * IEEE 802.11, Chap 5.5.
479 * 80211.o does filtering only based on association state, i.e., it
480 * drops Class 3 frames from not associated stations. hostapd sends
481 * deauth/disassoc frames when needed. In addition, hostapd is
482 * responsible for filtering on both auth and assoc states.
485 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
486 return ieee80211_rx_mesh_check(rx
);
488 if (unlikely(((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
||
489 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_CTL
&&
490 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_PSPOLL
)) &&
491 rx
->sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
&&
492 (!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_ASSOC
)))) {
493 if ((!(rx
->fc
& IEEE80211_FCTL_FROMDS
) &&
494 !(rx
->fc
& IEEE80211_FCTL_TODS
) &&
495 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
)
496 || !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
497 /* Drop IBSS frames and frames for other hosts
499 return RX_DROP_MONITOR
;
502 return RX_DROP_MONITOR
;
509 static ieee80211_rx_result
510 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data
*rx
)
512 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
515 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
516 struct ieee80211_key
*stakey
= NULL
;
521 * There are three types of keys:
523 * - PTK (pairwise keys)
524 * - STK (station-to-station pairwise keys)
526 * When selecting a key, we have to distinguish between multicast
527 * (including broadcast) and unicast frames, the latter can only
528 * use PTKs and STKs while the former always use GTKs. Unless, of
529 * course, actual WEP keys ("pre-RSNA") are used, then unicast
530 * frames can also use key indizes like GTKs. Hence, if we don't
531 * have a PTK/STK we check the key index for a WEP key.
533 * Note that in a regular BSS, multicast frames are sent by the
534 * AP only, associated stations unicast the frame to the AP first
535 * which then multicasts it on their behalf.
537 * There is also a slight problem in IBSS mode: GTKs are negotiated
538 * with each station, that is something we don't currently handle.
539 * The spec seems to expect that one negotiates the same key with
540 * every station but there's no such requirement; VLANs could be
544 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
))
548 * No point in finding a key and decrypting if the frame is neither
549 * addressed to us nor a multicast frame.
551 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
555 stakey
= rcu_dereference(rx
->sta
->key
);
557 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
561 * The device doesn't give us the IV so we won't be
562 * able to look up the key. That's ok though, we
563 * don't need to decrypt the frame, we just won't
564 * be able to keep statistics accurate.
565 * Except for key threshold notifications, should
566 * we somehow allow the driver to tell us which key
567 * the hardware used if this flag is set?
569 if ((rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
) &&
570 (rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
))
573 hdrlen
= ieee80211_get_hdrlen(rx
->fc
);
575 if (rx
->skb
->len
< 8 + hdrlen
)
576 return RX_DROP_UNUSABLE
; /* TODO: count this? */
579 * no need to call ieee80211_wep_get_keyidx,
580 * it verifies a bunch of things we've done already
582 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
584 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
587 * RSNA-protected unicast frames should always be sent with
588 * pairwise or station-to-station keys, but for WEP we allow
589 * using a key index as well.
591 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
592 !is_multicast_ether_addr(hdr
->addr1
))
597 rx
->key
->tx_rx_count
++;
598 /* TODO: add threshold stuff again */
600 #ifdef CONFIG_MAC80211_DEBUG
602 printk(KERN_DEBUG
"%s: RX protected frame,"
603 " but have no key\n", rx
->dev
->name
);
604 #endif /* CONFIG_MAC80211_DEBUG */
605 return RX_DROP_MONITOR
;
608 /* Check for weak IVs if possible */
609 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
610 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
) &&
611 (!(rx
->u
.rx
.status
->flag
& RX_FLAG_IV_STRIPPED
) ||
612 !(rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
)) &&
613 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
614 rx
->sta
->wep_weak_iv_count
++;
616 switch (rx
->key
->conf
.alg
) {
618 result
= ieee80211_crypto_wep_decrypt(rx
);
621 result
= ieee80211_crypto_tkip_decrypt(rx
);
624 result
= ieee80211_crypto_ccmp_decrypt(rx
);
628 /* either the frame has been decrypted or will be dropped */
629 rx
->u
.rx
.status
->flag
|= RX_FLAG_DECRYPTED
;
634 static void ap_sta_ps_start(struct net_device
*dev
, struct sta_info
*sta
)
636 struct ieee80211_sub_if_data
*sdata
;
637 DECLARE_MAC_BUF(mac
);
639 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
642 atomic_inc(&sdata
->bss
->num_sta_ps
);
643 sta
->flags
|= WLAN_STA_PS
;
644 sta
->flags
&= ~WLAN_STA_PSPOLL
;
645 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
646 printk(KERN_DEBUG
"%s: STA %s aid %d enters power save mode\n",
647 dev
->name
, print_mac(mac
, sta
->addr
), sta
->aid
);
648 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
651 static int ap_sta_ps_end(struct net_device
*dev
, struct sta_info
*sta
)
653 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
656 struct ieee80211_sub_if_data
*sdata
;
657 struct ieee80211_tx_packet_data
*pkt_data
;
658 DECLARE_MAC_BUF(mac
);
660 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
663 atomic_dec(&sdata
->bss
->num_sta_ps
);
665 sta
->flags
&= ~(WLAN_STA_PS
| WLAN_STA_PSPOLL
);
667 if (!skb_queue_empty(&sta
->ps_tx_buf
))
668 sta_info_clear_tim_bit(sta
);
670 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
671 printk(KERN_DEBUG
"%s: STA %s aid %d exits power save mode\n",
672 dev
->name
, print_mac(mac
, sta
->addr
), sta
->aid
);
673 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
675 /* Send all buffered frames to the station */
676 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
677 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
679 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
682 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
683 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
684 local
->total_ps_buffered
--;
686 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
687 printk(KERN_DEBUG
"%s: STA %s aid %d send PS frame "
688 "since STA not sleeping anymore\n", dev
->name
,
689 print_mac(mac
, sta
->addr
), sta
->aid
);
690 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
691 pkt_data
->flags
|= IEEE80211_TXPD_REQUEUE
;
698 static ieee80211_rx_result
699 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data
*rx
)
701 struct sta_info
*sta
= rx
->sta
;
702 struct net_device
*dev
= rx
->dev
;
703 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
708 /* Update last_rx only for IBSS packets which are for the current
709 * BSSID to avoid keeping the current IBSS network alive in cases where
710 * other STAs are using different BSSID. */
711 if (rx
->sdata
->vif
.type
== IEEE80211_IF_TYPE_IBSS
) {
712 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
713 IEEE80211_IF_TYPE_IBSS
);
714 if (compare_ether_addr(bssid
, rx
->sdata
->u
.sta
.bssid
) == 0)
715 sta
->last_rx
= jiffies
;
717 if (!is_multicast_ether_addr(hdr
->addr1
) ||
718 rx
->sdata
->vif
.type
== IEEE80211_IF_TYPE_STA
) {
719 /* Update last_rx only for unicast frames in order to prevent
720 * the Probe Request frames (the only broadcast frames from a
721 * STA in infrastructure mode) from keeping a connection alive.
722 * Mesh beacons will update last_rx when if they are found to
723 * match the current local configuration when processed.
725 sta
->last_rx
= jiffies
;
728 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
732 sta
->rx_bytes
+= rx
->skb
->len
;
733 sta
->last_rssi
= rx
->u
.rx
.status
->ssi
;
734 sta
->last_signal
= rx
->u
.rx
.status
->signal
;
735 sta
->last_noise
= rx
->u
.rx
.status
->noise
;
737 if (!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
)) {
738 /* Change STA power saving mode only in the end of a frame
739 * exchange sequence */
740 if ((sta
->flags
& WLAN_STA_PS
) && !(rx
->fc
& IEEE80211_FCTL_PM
))
741 rx
->u
.rx
.sent_ps_buffered
+= ap_sta_ps_end(dev
, sta
);
742 else if (!(sta
->flags
& WLAN_STA_PS
) &&
743 (rx
->fc
& IEEE80211_FCTL_PM
))
744 ap_sta_ps_start(dev
, sta
);
747 /* Drop data::nullfunc frames silently, since they are used only to
748 * control station power saving mode. */
749 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
750 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_NULLFUNC
) {
751 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
752 /* Update counter and free packet here to avoid counting this
753 * as a dropped packed. */
755 dev_kfree_skb(rx
->skb
);
760 } /* ieee80211_rx_h_sta_process */
762 static inline struct ieee80211_fragment_entry
*
763 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
764 unsigned int frag
, unsigned int seq
, int rx_queue
,
765 struct sk_buff
**skb
)
767 struct ieee80211_fragment_entry
*entry
;
770 idx
= sdata
->fragment_next
;
771 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
772 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
773 sdata
->fragment_next
= 0;
775 if (!skb_queue_empty(&entry
->skb_list
)) {
776 #ifdef CONFIG_MAC80211_DEBUG
777 struct ieee80211_hdr
*hdr
=
778 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
779 DECLARE_MAC_BUF(mac
);
780 DECLARE_MAC_BUF(mac2
);
781 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
782 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
783 "addr1=%s addr2=%s\n",
784 sdata
->dev
->name
, idx
,
785 jiffies
- entry
->first_frag_time
, entry
->seq
,
786 entry
->last_frag
, print_mac(mac
, hdr
->addr1
),
787 print_mac(mac2
, hdr
->addr2
));
788 #endif /* CONFIG_MAC80211_DEBUG */
789 __skb_queue_purge(&entry
->skb_list
);
792 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
794 entry
->first_frag_time
= jiffies
;
796 entry
->rx_queue
= rx_queue
;
797 entry
->last_frag
= frag
;
799 entry
->extra_len
= 0;
804 static inline struct ieee80211_fragment_entry
*
805 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
806 u16 fc
, unsigned int frag
, unsigned int seq
,
807 int rx_queue
, struct ieee80211_hdr
*hdr
)
809 struct ieee80211_fragment_entry
*entry
;
812 idx
= sdata
->fragment_next
;
813 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
814 struct ieee80211_hdr
*f_hdr
;
819 idx
= IEEE80211_FRAGMENT_MAX
- 1;
821 entry
= &sdata
->fragments
[idx
];
822 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
823 entry
->rx_queue
!= rx_queue
||
824 entry
->last_frag
+ 1 != frag
)
827 f_hdr
= (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
828 f_fc
= le16_to_cpu(f_hdr
->frame_control
);
830 if ((fc
& IEEE80211_FCTL_FTYPE
) != (f_fc
& IEEE80211_FCTL_FTYPE
) ||
831 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
832 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
835 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
836 __skb_queue_purge(&entry
->skb_list
);
845 static ieee80211_rx_result
846 ieee80211_rx_h_defragment(struct ieee80211_txrx_data
*rx
)
848 struct ieee80211_hdr
*hdr
;
850 unsigned int frag
, seq
;
851 struct ieee80211_fragment_entry
*entry
;
853 DECLARE_MAC_BUF(mac
);
855 hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
856 sc
= le16_to_cpu(hdr
->seq_ctrl
);
857 frag
= sc
& IEEE80211_SCTL_FRAG
;
859 if (likely((!(rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) && frag
== 0) ||
860 (rx
->skb
)->len
< 24 ||
861 is_multicast_ether_addr(hdr
->addr1
))) {
865 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
867 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
870 /* This is the first fragment of a new frame. */
871 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
872 rx
->u
.rx
.queue
, &(rx
->skb
));
873 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
874 (rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
875 /* Store CCMP PN so that we can verify that the next
876 * fragment has a sequential PN value. */
878 memcpy(entry
->last_pn
,
879 rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
],
885 /* This is a fragment for a frame that should already be pending in
886 * fragment cache. Add this fragment to the end of the pending entry.
888 entry
= ieee80211_reassemble_find(rx
->sdata
, rx
->fc
, frag
, seq
,
889 rx
->u
.rx
.queue
, hdr
);
891 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
892 return RX_DROP_MONITOR
;
895 /* Verify that MPDUs within one MSDU have sequential PN values.
896 * (IEEE 802.11i, 8.3.3.4.5) */
899 u8 pn
[CCMP_PN_LEN
], *rpn
;
900 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
901 return RX_DROP_UNUSABLE
;
902 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
903 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
908 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->u
.rx
.queue
];
909 if (memcmp(pn
, rpn
, CCMP_PN_LEN
) != 0) {
911 printk(KERN_DEBUG
"%s: defrag: CCMP PN not "
913 " PN=%02x%02x%02x%02x%02x%02x "
914 "(expected %02x%02x%02x%02x%02x%02x)\n",
915 rx
->dev
->name
, print_mac(mac
, hdr
->addr2
),
916 rpn
[0], rpn
[1], rpn
[2], rpn
[3], rpn
[4],
917 rpn
[5], pn
[0], pn
[1], pn
[2], pn
[3],
919 return RX_DROP_UNUSABLE
;
921 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
924 skb_pull(rx
->skb
, ieee80211_get_hdrlen(rx
->fc
));
925 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
926 entry
->last_frag
= frag
;
927 entry
->extra_len
+= rx
->skb
->len
;
928 if (rx
->fc
& IEEE80211_FCTL_MOREFRAGS
) {
933 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
934 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
935 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
936 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
938 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
939 __skb_queue_purge(&entry
->skb_list
);
940 return RX_DROP_UNUSABLE
;
943 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
944 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
948 /* Complete frame has been reassembled - process it now */
949 rx
->flags
|= IEEE80211_TXRXD_FRAGMENTED
;
953 rx
->sta
->rx_packets
++;
954 if (is_multicast_ether_addr(hdr
->addr1
))
955 rx
->local
->dot11MulticastReceivedFrameCount
++;
957 ieee80211_led_rx(rx
->local
);
961 static ieee80211_rx_result
962 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data
*rx
)
964 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
967 DECLARE_MAC_BUF(mac
);
969 if (likely(!rx
->sta
||
970 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_CTL
||
971 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_PSPOLL
||
972 !(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)))
975 if ((sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
) &&
976 (sdata
->vif
.type
!= IEEE80211_IF_TYPE_VLAN
))
977 return RX_DROP_UNUSABLE
;
979 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
981 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
983 rx
->local
->total_ps_buffered
--;
985 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
986 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
989 struct ieee80211_hdr
*hdr
=
990 (struct ieee80211_hdr
*) skb
->data
;
993 * Tell TX path to send one frame even though the STA may
994 * still remain is PS mode after this frame exchange.
996 rx
->sta
->flags
|= WLAN_STA_PSPOLL
;
998 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
999 printk(KERN_DEBUG
"STA %s aid %d: PS Poll (entries after %d)\n",
1000 print_mac(mac
, rx
->sta
->addr
), rx
->sta
->aid
,
1001 skb_queue_len(&rx
->sta
->ps_tx_buf
));
1002 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1004 /* Use MoreData flag to indicate whether there are more
1005 * buffered frames for this STA */
1006 if (no_pending_pkts
)
1007 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1009 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1011 dev_queue_xmit(skb
);
1013 if (no_pending_pkts
)
1014 sta_info_clear_tim_bit(rx
->sta
);
1015 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1016 } else if (!rx
->u
.rx
.sent_ps_buffered
) {
1018 * FIXME: This can be the result of a race condition between
1019 * us expiring a frame and the station polling for it.
1020 * Should we send it a null-func frame indicating we
1021 * have nothing buffered for it?
1023 printk(KERN_DEBUG
"%s: STA %s sent PS Poll even "
1024 "though there is no buffered frames for it\n",
1025 rx
->dev
->name
, print_mac(mac
, rx
->sta
->addr
));
1026 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1029 /* Free PS Poll skb here instead of returning RX_DROP that would
1030 * count as an dropped frame. */
1031 dev_kfree_skb(rx
->skb
);
1036 static ieee80211_rx_result
1037 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data
*rx
)
1040 u8
*data
= rx
->skb
->data
;
1041 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) data
;
1043 if (!WLAN_FC_IS_QOS_DATA(fc
))
1046 /* remove the qos control field, update frame type and meta-data */
1047 memmove(data
+ 2, data
, ieee80211_get_hdrlen(fc
) - 2);
1048 hdr
= (struct ieee80211_hdr
*) skb_pull(rx
->skb
, 2);
1049 /* change frame type to non QOS */
1050 rx
->fc
= fc
&= ~IEEE80211_STYPE_QOS_DATA
;
1051 hdr
->frame_control
= cpu_to_le16(fc
);
1057 ieee80211_802_1x_port_control(struct ieee80211_txrx_data
*rx
)
1059 if (unlikely(!rx
->sta
|| !(rx
->sta
->flags
& WLAN_STA_AUTHORIZED
))) {
1060 #ifdef CONFIG_MAC80211_DEBUG
1061 if (net_ratelimit())
1062 printk(KERN_DEBUG
"%s: dropped frame "
1063 "(unauthorized port)\n", rx
->dev
->name
);
1064 #endif /* CONFIG_MAC80211_DEBUG */
1072 ieee80211_drop_unencrypted(struct ieee80211_txrx_data
*rx
)
1075 * Pass through unencrypted frames if the hardware has
1076 * decrypted them already.
1078 if (rx
->u
.rx
.status
->flag
& RX_FLAG_DECRYPTED
)
1081 /* Drop unencrypted frames if key is set. */
1082 if (unlikely(!(rx
->fc
& IEEE80211_FCTL_PROTECTED
) &&
1083 (rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_DATA
&&
1084 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_NULLFUNC
&&
1085 (rx
->key
|| rx
->sdata
->drop_unencrypted
))) {
1086 if (net_ratelimit())
1087 printk(KERN_DEBUG
"%s: RX non-WEP frame, but expected "
1088 "encryption\n", rx
->dev
->name
);
1095 ieee80211_data_to_8023(struct ieee80211_txrx_data
*rx
)
1097 struct net_device
*dev
= rx
->dev
;
1098 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
1099 u16 fc
, hdrlen
, ethertype
;
1103 struct sk_buff
*skb
= rx
->skb
;
1104 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1105 DECLARE_MAC_BUF(mac
);
1106 DECLARE_MAC_BUF(mac2
);
1107 DECLARE_MAC_BUF(mac3
);
1108 DECLARE_MAC_BUF(mac4
);
1112 if (unlikely(!WLAN_FC_DATA_PRESENT(fc
)))
1115 hdrlen
= ieee80211_get_hdrlen(fc
);
1117 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1118 int meshhdrlen
= ieee80211_get_mesh_hdrlen(
1119 (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
));
1121 * - mesh header: to be used for mesh forwarding
1122 * decision. It will also be used as mesh header template at
1123 * tx.c:ieee80211_subif_start_xmit() if interface
1124 * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1125 * - ta: to be used if a RERR needs to be sent.
1127 memcpy(skb
->cb
, skb
->data
+ hdrlen
, meshhdrlen
);
1128 memcpy(MESH_PREQ(skb
), hdr
->addr2
, ETH_ALEN
);
1129 hdrlen
+= meshhdrlen
;
1132 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1134 * IEEE 802.11 address fields:
1135 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1136 * 0 0 DA SA BSSID n/a
1137 * 0 1 DA BSSID SA n/a
1138 * 1 0 BSSID SA DA n/a
1142 switch (fc
& (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
1143 case IEEE80211_FCTL_TODS
:
1145 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
1146 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
1148 if (unlikely(sdata
->vif
.type
!= IEEE80211_IF_TYPE_AP
&&
1149 sdata
->vif
.type
!= IEEE80211_IF_TYPE_VLAN
)) {
1150 if (net_ratelimit())
1151 printk(KERN_DEBUG
"%s: dropped ToDS frame "
1152 "(BSSID=%s SA=%s DA=%s)\n",
1154 print_mac(mac
, hdr
->addr1
),
1155 print_mac(mac2
, hdr
->addr2
),
1156 print_mac(mac3
, hdr
->addr3
));
1160 case (IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
1162 memcpy(dst
, hdr
->addr3
, ETH_ALEN
);
1163 memcpy(src
, hdr
->addr4
, ETH_ALEN
);
1165 if (unlikely(sdata
->vif
.type
!= IEEE80211_IF_TYPE_WDS
&&
1166 sdata
->vif
.type
!= IEEE80211_IF_TYPE_MESH_POINT
)) {
1167 if (net_ratelimit())
1168 printk(KERN_DEBUG
"%s: dropped FromDS&ToDS "
1169 "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1171 print_mac(mac
, hdr
->addr1
),
1172 print_mac(mac2
, hdr
->addr2
),
1173 print_mac(mac3
, hdr
->addr3
),
1174 print_mac(mac4
, hdr
->addr4
));
1178 case IEEE80211_FCTL_FROMDS
:
1180 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
1181 memcpy(src
, hdr
->addr3
, ETH_ALEN
);
1183 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_STA
||
1184 (is_multicast_ether_addr(dst
) &&
1185 !compare_ether_addr(src
, dev
->dev_addr
)))
1190 memcpy(dst
, hdr
->addr1
, ETH_ALEN
);
1191 memcpy(src
, hdr
->addr2
, ETH_ALEN
);
1193 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_IBSS
) {
1194 if (net_ratelimit()) {
1195 printk(KERN_DEBUG
"%s: dropped IBSS frame "
1196 "(DA=%s SA=%s BSSID=%s)\n",
1198 print_mac(mac
, hdr
->addr1
),
1199 print_mac(mac2
, hdr
->addr2
),
1200 print_mac(mac3
, hdr
->addr3
));
1207 if (unlikely(skb
->len
- hdrlen
< 8)) {
1208 if (net_ratelimit()) {
1209 printk(KERN_DEBUG
"%s: RX too short data frame "
1210 "payload\n", dev
->name
);
1215 payload
= skb
->data
+ hdrlen
;
1216 ethertype
= (payload
[6] << 8) | payload
[7];
1218 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1219 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1220 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1221 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1222 * replace EtherType */
1223 skb_pull(skb
, hdrlen
+ 6);
1224 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1225 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1227 struct ethhdr
*ehdr
;
1230 skb_pull(skb
, hdrlen
);
1231 len
= htons(skb
->len
);
1232 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1233 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1234 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1235 ehdr
->h_proto
= len
;
1241 * requires that rx->skb is a frame with ethernet header
1243 static bool ieee80211_frame_allowed(struct ieee80211_txrx_data
*rx
)
1245 static const u8 pae_group_addr
[ETH_ALEN
]
1246 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1247 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1250 * Allow EAPOL frames to us/the PAE group address regardless
1251 * of whether the frame was encrypted or not.
1253 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1254 (compare_ether_addr(ehdr
->h_dest
, rx
->dev
->dev_addr
) == 0 ||
1255 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1258 if (ieee80211_802_1x_port_control(rx
) ||
1259 ieee80211_drop_unencrypted(rx
))
1266 * requires that rx->skb is a frame with ethernet header
1269 ieee80211_deliver_skb(struct ieee80211_txrx_data
*rx
)
1271 struct net_device
*dev
= rx
->dev
;
1272 struct ieee80211_local
*local
= rx
->local
;
1273 struct sk_buff
*skb
, *xmit_skb
;
1274 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1275 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1276 struct sta_info
*dsta
;
1281 if (local
->bridge_packets
&& (sdata
->vif
.type
== IEEE80211_IF_TYPE_AP
||
1282 sdata
->vif
.type
== IEEE80211_IF_TYPE_VLAN
) &&
1283 (rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
)) {
1284 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1286 * send multicast frames both to higher layers in
1287 * local net stack and back to the wireless medium
1289 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1290 if (!xmit_skb
&& net_ratelimit())
1291 printk(KERN_DEBUG
"%s: failed to clone "
1292 "multicast frame\n", dev
->name
);
1294 dsta
= sta_info_get(local
, skb
->data
);
1295 if (dsta
&& dsta
->dev
== dev
) {
1297 * The destination station is associated to
1298 * this AP (in this VLAN), so send the frame
1299 * directly to it and do not pass it to local
1310 /* Mesh forwarding */
1311 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1312 u8
*mesh_ttl
= &((struct ieee80211s_hdr
*)skb
->cb
)->ttl
;
1315 if (is_multicast_ether_addr(skb
->data
)) {
1316 if (*mesh_ttl
> 0) {
1317 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1318 if (!xmit_skb
&& net_ratelimit())
1319 printk(KERN_DEBUG
"%s: failed to clone "
1320 "multicast frame\n", dev
->name
);
1322 xmit_skb
->pkt_type
= PACKET_OTHERHOST
;
1324 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.sta
,
1325 dropped_frames_ttl
);
1326 } else if (skb
->pkt_type
!= PACKET_OTHERHOST
&&
1327 compare_ether_addr(dev
->dev_addr
, skb
->data
) != 0) {
1328 if (*mesh_ttl
== 0) {
1329 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.sta
,
1330 dropped_frames_ttl
);
1335 xmit_skb
->pkt_type
= PACKET_OTHERHOST
;
1336 if (!(dev
->flags
& IFF_PROMISC
))
1343 /* deliver to local stack */
1344 skb
->protocol
= eth_type_trans(skb
, dev
);
1345 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1350 /* send to wireless media */
1351 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1352 skb_reset_network_header(xmit_skb
);
1353 skb_reset_mac_header(xmit_skb
);
1354 dev_queue_xmit(xmit_skb
);
1358 static ieee80211_rx_result
1359 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data
*rx
)
1361 struct net_device
*dev
= rx
->dev
;
1362 struct ieee80211_local
*local
= rx
->local
;
1365 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1366 const struct ethhdr
*eth
;
1370 DECLARE_MAC_BUF(mac
);
1373 if (unlikely((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
))
1376 if (unlikely(!WLAN_FC_DATA_PRESENT(fc
)))
1377 return RX_DROP_MONITOR
;
1379 if (!(rx
->flags
& IEEE80211_TXRXD_RX_AMSDU
))
1382 err
= ieee80211_data_to_8023(rx
);
1384 return RX_DROP_UNUSABLE
;
1388 dev
->stats
.rx_packets
++;
1389 dev
->stats
.rx_bytes
+= skb
->len
;
1391 /* skip the wrapping header */
1392 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1394 return RX_DROP_UNUSABLE
;
1396 while (skb
!= frame
) {
1398 __be16 len
= eth
->h_proto
;
1399 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1401 remaining
= skb
->len
;
1402 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1403 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1405 padding
= ((4 - subframe_len
) & 0x3);
1406 /* the last MSDU has no padding */
1407 if (subframe_len
> remaining
) {
1408 printk(KERN_DEBUG
"%s: wrong buffer size", dev
->name
);
1409 return RX_DROP_UNUSABLE
;
1412 skb_pull(skb
, sizeof(struct ethhdr
));
1413 /* if last subframe reuse skb */
1414 if (remaining
<= subframe_len
+ padding
)
1417 frame
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+
1421 return RX_DROP_UNUSABLE
;
1423 skb_reserve(frame
, local
->hw
.extra_tx_headroom
+
1424 sizeof(struct ethhdr
));
1425 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1428 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1431 printk(KERN_DEBUG
"%s: wrong buffer size ",
1433 dev_kfree_skb(frame
);
1434 return RX_DROP_UNUSABLE
;
1438 skb_reset_network_header(frame
);
1440 frame
->priority
= skb
->priority
;
1443 payload
= frame
->data
;
1444 ethertype
= (payload
[6] << 8) | payload
[7];
1446 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1447 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1448 compare_ether_addr(payload
,
1449 bridge_tunnel_header
) == 0)) {
1450 /* remove RFC1042 or Bridge-Tunnel
1451 * encapsulation and replace EtherType */
1453 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1454 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1456 memcpy(skb_push(frame
, sizeof(__be16
)),
1457 &len
, sizeof(__be16
));
1458 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1459 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1462 if (!ieee80211_frame_allowed(rx
)) {
1463 if (skb
== frame
) /* last frame */
1464 return RX_DROP_UNUSABLE
;
1465 dev_kfree_skb(frame
);
1469 ieee80211_deliver_skb(rx
);
1475 static ieee80211_rx_result
1476 ieee80211_rx_h_data(struct ieee80211_txrx_data
*rx
)
1478 struct net_device
*dev
= rx
->dev
;
1483 if (unlikely((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
))
1486 if (unlikely(!WLAN_FC_DATA_PRESENT(fc
)))
1487 return RX_DROP_MONITOR
;
1489 err
= ieee80211_data_to_8023(rx
);
1491 return RX_DROP_UNUSABLE
;
1493 if (!ieee80211_frame_allowed(rx
))
1494 return RX_DROP_MONITOR
;
1498 dev
->stats
.rx_packets
++;
1499 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1501 ieee80211_deliver_skb(rx
);
1506 static ieee80211_rx_result
1507 ieee80211_rx_h_ctrl(struct ieee80211_txrx_data
*rx
)
1509 struct ieee80211_local
*local
= rx
->local
;
1510 struct ieee80211_hw
*hw
= &local
->hw
;
1511 struct sk_buff
*skb
= rx
->skb
;
1512 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*) skb
->data
;
1513 struct tid_ampdu_rx
*tid_agg_rx
;
1517 if (likely((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_CTL
))
1520 if ((rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_BACK_REQ
) {
1523 tid
= le16_to_cpu(bar
->control
) >> 12;
1524 tid_agg_rx
= &(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
1525 if (tid_agg_rx
->state
!= HT_AGG_STATE_OPERATIONAL
)
1528 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1530 /* reset session timer */
1531 if (tid_agg_rx
->timeout
) {
1532 unsigned long expires
=
1533 jiffies
+ (tid_agg_rx
->timeout
/ 1000) * HZ
;
1534 mod_timer(&tid_agg_rx
->session_timer
, expires
);
1537 /* manage reordering buffer according to requested */
1538 /* sequence number */
1540 ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, NULL
,
1543 return RX_DROP_UNUSABLE
;
1549 static ieee80211_rx_result
1550 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data
*rx
)
1552 struct ieee80211_sub_if_data
*sdata
;
1554 if (!(rx
->flags
& IEEE80211_TXRXD_RXRA_MATCH
))
1555 return RX_DROP_MONITOR
;
1557 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1558 if ((sdata
->vif
.type
== IEEE80211_IF_TYPE_STA
||
1559 sdata
->vif
.type
== IEEE80211_IF_TYPE_IBSS
||
1560 sdata
->vif
.type
== IEEE80211_IF_TYPE_MESH_POINT
) &&
1561 !(sdata
->flags
& IEEE80211_SDATA_USERSPACE_MLME
))
1562 ieee80211_sta_rx_mgmt(rx
->dev
, rx
->skb
, rx
->u
.rx
.status
);
1564 return RX_DROP_MONITOR
;
1569 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1570 struct ieee80211_hdr
*hdr
,
1571 struct ieee80211_txrx_data
*rx
)
1574 DECLARE_MAC_BUF(mac
);
1575 DECLARE_MAC_BUF(mac2
);
1577 hdrlen
= ieee80211_get_hdrlen_from_skb(rx
->skb
);
1578 if (rx
->skb
->len
>= hdrlen
+ 4)
1579 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1583 if (net_ratelimit())
1584 printk(KERN_DEBUG
"%s: TKIP hwaccel reported Michael MIC "
1585 "failure from %s to %s keyidx=%d\n",
1586 dev
->name
, print_mac(mac
, hdr
->addr2
),
1587 print_mac(mac2
, hdr
->addr1
), keyidx
);
1591 * Some hardware seem to generate incorrect Michael MIC
1592 * reports; ignore them to avoid triggering countermeasures.
1594 if (net_ratelimit())
1595 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1596 "error for unknown address %s\n",
1597 dev
->name
, print_mac(mac
, hdr
->addr2
));
1601 if (!(rx
->fc
& IEEE80211_FCTL_PROTECTED
)) {
1602 if (net_ratelimit())
1603 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1604 "error for a frame with no PROTECTED flag (src "
1605 "%s)\n", dev
->name
, print_mac(mac
, hdr
->addr2
));
1609 if (rx
->sdata
->vif
.type
== IEEE80211_IF_TYPE_AP
&& keyidx
) {
1611 * APs with pairwise keys should never receive Michael MIC
1612 * errors for non-zero keyidx because these are reserved for
1613 * group keys and only the AP is sending real multicast
1614 * frames in the BSS.
1616 if (net_ratelimit())
1617 printk(KERN_DEBUG
"%s: ignored Michael MIC error for "
1618 "a frame with non-zero keyidx (%d)"
1619 " (src %s)\n", dev
->name
, keyidx
,
1620 print_mac(mac
, hdr
->addr2
));
1624 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
&&
1625 ((rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_MGMT
||
1626 (rx
->fc
& IEEE80211_FCTL_STYPE
) != IEEE80211_STYPE_AUTH
)) {
1627 if (net_ratelimit())
1628 printk(KERN_DEBUG
"%s: ignored spurious Michael MIC "
1629 "error for a frame that cannot be encrypted "
1630 "(fc=0x%04x) (src %s)\n",
1631 dev
->name
, rx
->fc
, print_mac(mac
, hdr
->addr2
));
1635 mac80211_ev_michael_mic_failure(rx
->dev
, keyidx
, hdr
);
1637 dev_kfree_skb(rx
->skb
);
1641 static void ieee80211_rx_cooked_monitor(struct ieee80211_txrx_data
*rx
)
1643 struct ieee80211_sub_if_data
*sdata
;
1644 struct ieee80211_local
*local
= rx
->local
;
1645 struct ieee80211_rtap_hdr
{
1646 struct ieee80211_radiotap_header hdr
;
1651 } __attribute__ ((packed
)) *rthdr
;
1652 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1653 struct net_device
*prev_dev
= NULL
;
1654 struct ieee80211_rx_status
*status
= rx
->u
.rx
.status
;
1656 if (rx
->flags
& IEEE80211_TXRXD_RX_CMNTR_REPORTED
)
1659 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
1660 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
1663 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
1664 memset(rthdr
, 0, sizeof(*rthdr
));
1665 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
1666 rthdr
->hdr
.it_present
=
1667 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
1668 (1 << IEEE80211_RADIOTAP_RATE
) |
1669 (1 << IEEE80211_RADIOTAP_CHANNEL
));
1671 rthdr
->rate
= rx
->u
.rx
.rate
->bitrate
/ 5;
1672 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
1674 if (status
->band
== IEEE80211_BAND_5GHZ
)
1675 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
1676 IEEE80211_CHAN_5GHZ
);
1678 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
1679 IEEE80211_CHAN_2GHZ
);
1681 skb_set_mac_header(skb
, 0);
1682 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1683 skb
->pkt_type
= PACKET_OTHERHOST
;
1684 skb
->protocol
= htons(ETH_P_802_2
);
1686 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1687 if (!netif_running(sdata
->dev
))
1690 if (sdata
->vif
.type
!= IEEE80211_IF_TYPE_MNTR
||
1691 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
1695 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1697 skb2
->dev
= prev_dev
;
1702 prev_dev
= sdata
->dev
;
1703 sdata
->dev
->stats
.rx_packets
++;
1704 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
1708 skb
->dev
= prev_dev
;
1714 rx
->flags
|= IEEE80211_TXRXD_RX_CMNTR_REPORTED
;
1721 typedef ieee80211_rx_result (*ieee80211_rx_handler
)(struct ieee80211_txrx_data
*);
1722 static ieee80211_rx_handler ieee80211_rx_handlers
[] =
1724 ieee80211_rx_h_if_stats
,
1725 ieee80211_rx_h_passive_scan
,
1726 ieee80211_rx_h_check
,
1727 ieee80211_rx_h_decrypt
,
1728 ieee80211_rx_h_sta_process
,
1729 ieee80211_rx_h_defragment
,
1730 ieee80211_rx_h_ps_poll
,
1731 ieee80211_rx_h_michael_mic_verify
,
1732 /* this must be after decryption - so header is counted in MPDU mic
1733 * must be before pae and data, so QOS_DATA format frames
1734 * are not passed to user space by these functions
1736 ieee80211_rx_h_remove_qos_control
,
1737 ieee80211_rx_h_amsdu
,
1738 ieee80211_rx_h_data
,
1739 ieee80211_rx_h_ctrl
,
1740 ieee80211_rx_h_mgmt
,
1744 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
1745 struct ieee80211_txrx_data
*rx
,
1746 struct sk_buff
*skb
)
1748 ieee80211_rx_handler
*handler
;
1749 ieee80211_rx_result res
= RX_DROP_MONITOR
;
1753 rx
->dev
= sdata
->dev
;
1755 for (handler
= ieee80211_rx_handlers
; *handler
!= NULL
; handler
++) {
1756 res
= (*handler
)(rx
);
1761 case RX_DROP_UNUSABLE
:
1762 case RX_DROP_MONITOR
:
1763 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
1765 rx
->sta
->rx_dropped
++;
1768 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
1776 case RX_DROP_MONITOR
:
1777 ieee80211_rx_cooked_monitor(rx
);
1779 case RX_DROP_UNUSABLE
:
1780 dev_kfree_skb(rx
->skb
);
1785 /* main receive path */
1787 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
1788 u8
*bssid
, struct ieee80211_txrx_data
*rx
,
1789 struct ieee80211_hdr
*hdr
)
1791 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
1793 switch (sdata
->vif
.type
) {
1794 case IEEE80211_IF_TYPE_STA
:
1797 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1798 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1800 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1801 } else if (!multicast
&&
1802 compare_ether_addr(sdata
->dev
->dev_addr
,
1804 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
1806 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1809 case IEEE80211_IF_TYPE_IBSS
:
1812 if ((rx
->fc
& IEEE80211_FCTL_FTYPE
) == IEEE80211_FTYPE_MGMT
&&
1813 (rx
->fc
& IEEE80211_FCTL_STYPE
) == IEEE80211_STYPE_BEACON
)
1815 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
1816 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1818 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1819 } else if (!multicast
&&
1820 compare_ether_addr(sdata
->dev
->dev_addr
,
1822 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
1824 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1825 } else if (!rx
->sta
)
1826 rx
->sta
= ieee80211_ibss_add_sta(sdata
->dev
, rx
->skb
,
1829 case IEEE80211_IF_TYPE_MESH_POINT
:
1831 compare_ether_addr(sdata
->dev
->dev_addr
,
1833 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
1836 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1839 case IEEE80211_IF_TYPE_VLAN
:
1840 case IEEE80211_IF_TYPE_AP
:
1842 if (compare_ether_addr(sdata
->dev
->dev_addr
,
1845 } else if (!ieee80211_bssid_match(bssid
,
1846 sdata
->dev
->dev_addr
)) {
1847 if (!(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1849 rx
->flags
&= ~IEEE80211_TXRXD_RXRA_MATCH
;
1851 if (sdata
->dev
== sdata
->local
->mdev
&&
1852 !(rx
->flags
& IEEE80211_TXRXD_RXIN_SCAN
))
1853 /* do not receive anything via
1854 * master device when not scanning */
1857 case IEEE80211_IF_TYPE_WDS
:
1859 (rx
->fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
)
1861 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
1864 case IEEE80211_IF_TYPE_MNTR
:
1865 /* take everything */
1867 case IEEE80211_IF_TYPE_INVALID
:
1868 /* should never get here */
1877 * This is the actual Rx frames handler. as it blongs to Rx path it must
1878 * be called with rcu_read_lock protection.
1880 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
1881 struct sk_buff
*skb
,
1882 struct ieee80211_rx_status
*status
,
1884 struct ieee80211_rate
*rate
)
1886 struct ieee80211_local
*local
= hw_to_local(hw
);
1887 struct ieee80211_sub_if_data
*sdata
;
1888 struct ieee80211_hdr
*hdr
;
1889 struct ieee80211_txrx_data rx
;
1892 struct ieee80211_sub_if_data
*prev
= NULL
;
1893 struct sk_buff
*skb_new
;
1896 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1897 memset(&rx
, 0, sizeof(rx
));
1901 rx
.u
.rx
.status
= status
;
1902 rx
.u
.rx
.load
= load
;
1903 rx
.u
.rx
.rate
= rate
;
1904 rx
.fc
= le16_to_cpu(hdr
->frame_control
);
1905 type
= rx
.fc
& IEEE80211_FCTL_FTYPE
;
1907 if (type
== IEEE80211_FTYPE_DATA
|| type
== IEEE80211_FTYPE_MGMT
)
1908 local
->dot11ReceivedFragmentCount
++;
1910 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
1912 rx
.dev
= rx
.sta
->dev
;
1913 rx
.sdata
= IEEE80211_DEV_TO_SUB_IF(rx
.dev
);
1916 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
1917 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, &rx
);
1921 if (unlikely(local
->sta_sw_scanning
|| local
->sta_hw_scanning
))
1922 rx
.flags
|= IEEE80211_TXRXD_RXIN_SCAN
;
1924 ieee80211_parse_qos(&rx
);
1925 ieee80211_verify_ip_alignment(&rx
);
1929 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1930 if (!netif_running(sdata
->dev
))
1933 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_MNTR
)
1936 bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
1937 rx
.flags
|= IEEE80211_TXRXD_RXRA_MATCH
;
1938 prepares
= prepare_for_handlers(sdata
, bssid
, &rx
, hdr
);
1944 * frame is destined for this interface, but if it's not
1945 * also for the previous one we handle that after the
1946 * loop to avoid copying the SKB once too much
1955 * frame was destined for the previous interface
1956 * so invoke RX handlers for it
1959 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
1961 if (net_ratelimit())
1962 printk(KERN_DEBUG
"%s: failed to copy "
1963 "multicast frame for %s",
1964 wiphy_name(local
->hw
.wiphy
),
1968 rx
.fc
= le16_to_cpu(hdr
->frame_control
);
1969 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
1973 rx
.fc
= le16_to_cpu(hdr
->frame_control
);
1974 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
1980 sta_info_put(rx
.sta
);
1983 #define SEQ_MODULO 0x1000
1984 #define SEQ_MASK 0xfff
1986 static inline int seq_less(u16 sq1
, u16 sq2
)
1988 return (((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1));
1991 static inline u16
seq_inc(u16 sq
)
1993 return ((sq
+ 1) & SEQ_MASK
);
1996 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
1998 return ((sq1
- sq2
) & SEQ_MASK
);
2003 * As it function blongs to Rx path it must be called with
2004 * the proper rcu_read_lock protection for its flow.
2006 u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
2007 struct tid_ampdu_rx
*tid_agg_rx
,
2008 struct sk_buff
*skb
, u16 mpdu_seq_num
,
2011 struct ieee80211_local
*local
= hw_to_local(hw
);
2012 struct ieee80211_rx_status status
;
2013 u16 head_seq_num
, buf_size
;
2016 struct ieee80211_supported_band
*sband
;
2017 struct ieee80211_rate
*rate
;
2019 buf_size
= tid_agg_rx
->buf_size
;
2020 head_seq_num
= tid_agg_rx
->head_seq_num
;
2022 /* frame with out of date sequence number */
2023 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
2028 /* if frame sequence number exceeds our buffering window size or
2029 * block Ack Request arrived - release stored frames */
2030 if ((!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) || (bar_req
)) {
2031 /* new head to the ordering buffer */
2033 head_seq_num
= mpdu_seq_num
;
2036 seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
2037 /* release stored frames up to new head to stack */
2038 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
2039 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2041 % tid_agg_rx
->buf_size
;
2043 if (tid_agg_rx
->reorder_buf
[index
]) {
2044 /* release the reordered frames to stack */
2046 tid_agg_rx
->reorder_buf
[index
]->cb
,
2048 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2049 rate
= &sband
->bitrates
[status
.rate_idx
];
2050 pkt_load
= ieee80211_rx_load_stats(local
,
2051 tid_agg_rx
->reorder_buf
[index
],
2053 __ieee80211_rx_handle_packet(hw
,
2054 tid_agg_rx
->reorder_buf
[index
],
2055 &status
, pkt_load
, rate
);
2056 tid_agg_rx
->stored_mpdu_num
--;
2057 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2059 tid_agg_rx
->head_seq_num
=
2060 seq_inc(tid_agg_rx
->head_seq_num
);
2066 /* now the new frame is always in the range of the reordering */
2068 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
)
2069 % tid_agg_rx
->buf_size
;
2070 /* check if we already stored this frame */
2071 if (tid_agg_rx
->reorder_buf
[index
]) {
2076 /* if arrived mpdu is in the right order and nothing else stored */
2077 /* release it immediately */
2078 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
2079 tid_agg_rx
->stored_mpdu_num
== 0) {
2080 tid_agg_rx
->head_seq_num
=
2081 seq_inc(tid_agg_rx
->head_seq_num
);
2085 /* put the frame in the reordering buffer */
2086 tid_agg_rx
->reorder_buf
[index
] = skb
;
2087 tid_agg_rx
->stored_mpdu_num
++;
2088 /* release the buffer until next missing frame */
2089 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
)
2090 % tid_agg_rx
->buf_size
;
2091 while (tid_agg_rx
->reorder_buf
[index
]) {
2092 /* release the reordered frame back to stack */
2093 memcpy(&status
, tid_agg_rx
->reorder_buf
[index
]->cb
,
2095 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2096 rate
= &sband
->bitrates
[status
.rate_idx
];
2097 pkt_load
= ieee80211_rx_load_stats(local
,
2098 tid_agg_rx
->reorder_buf
[index
],
2100 __ieee80211_rx_handle_packet(hw
, tid_agg_rx
->reorder_buf
[index
],
2101 &status
, pkt_load
, rate
);
2102 tid_agg_rx
->stored_mpdu_num
--;
2103 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2104 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
2105 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2106 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
2111 static u8
ieee80211_rx_reorder_ampdu(struct ieee80211_local
*local
,
2112 struct sk_buff
*skb
)
2114 struct ieee80211_hw
*hw
= &local
->hw
;
2115 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
2116 struct sta_info
*sta
;
2117 struct tid_ampdu_rx
*tid_agg_rx
;
2123 sta
= sta_info_get(local
, hdr
->addr2
);
2127 fc
= le16_to_cpu(hdr
->frame_control
);
2129 /* filter the QoS data rx stream according to
2130 * STA/TID and check if this STA/TID is on aggregation */
2131 if (!WLAN_FC_IS_QOS_DATA(fc
))
2134 qc
= skb
->data
+ ieee80211_get_hdrlen(fc
) - QOS_CONTROL_LEN
;
2135 tid
= qc
[0] & QOS_CONTROL_TID_MASK
;
2136 tid_agg_rx
= &(sta
->ampdu_mlme
.tid_rx
[tid
]);
2138 if (tid_agg_rx
->state
!= HT_AGG_STATE_OPERATIONAL
)
2141 /* null data frames are excluded */
2142 if (unlikely(fc
& IEEE80211_STYPE_NULLFUNC
))
2145 /* new un-ordered ampdu frame - process it */
2147 /* reset session timer */
2148 if (tid_agg_rx
->timeout
) {
2149 unsigned long expires
=
2150 jiffies
+ (tid_agg_rx
->timeout
/ 1000) * HZ
;
2151 mod_timer(&tid_agg_rx
->session_timer
, expires
);
2154 /* if this mpdu is fragmented - terminate rx aggregation session */
2155 sc
= le16_to_cpu(hdr
->seq_ctrl
);
2156 if (sc
& IEEE80211_SCTL_FRAG
) {
2157 ieee80211_sta_stop_rx_ba_session(sta
->dev
, sta
->addr
,
2158 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
2163 /* according to mpdu sequence number deal with reordering buffer */
2164 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
2165 ret
= ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
,
2174 * This is the receive path handler. It is called by a low level driver when an
2175 * 802.11 MPDU is received from the hardware.
2177 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2178 struct ieee80211_rx_status
*status
)
2180 struct ieee80211_local
*local
= hw_to_local(hw
);
2182 struct ieee80211_rate
*rate
= NULL
;
2183 struct ieee80211_supported_band
*sband
;
2185 if (status
->band
< 0 ||
2186 status
->band
> IEEE80211_NUM_BANDS
) {
2191 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2194 status
->rate_idx
< 0 ||
2195 status
->rate_idx
>= sband
->n_bitrates
) {
2200 rate
= &sband
->bitrates
[status
->rate_idx
];
2203 * key references and virtual interfaces are protected using RCU
2204 * and this requires that we are in a read-side RCU section during
2205 * receive processing
2210 * Frames with failed FCS/PLCP checksum are not returned,
2211 * all other frames are returned without radiotap header
2212 * if it was previously present.
2213 * Also, frames with less than 16 bytes are dropped.
2215 skb
= ieee80211_rx_monitor(local
, skb
, status
, rate
);
2221 pkt_load
= ieee80211_rx_load_stats(local
, skb
, status
, rate
);
2222 local
->channel_use_raw
+= pkt_load
;
2224 if (!ieee80211_rx_reorder_ampdu(local
, skb
))
2225 __ieee80211_rx_handle_packet(hw
, skb
, status
, pkt_load
, rate
);
2229 EXPORT_SYMBOL(__ieee80211_rx
);
2231 /* This is a version of the rx handler that can be called from hard irq
2232 * context. Post the skb on the queue and schedule the tasklet */
2233 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2234 struct ieee80211_rx_status
*status
)
2236 struct ieee80211_local
*local
= hw_to_local(hw
);
2238 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2240 skb
->dev
= local
->mdev
;
2241 /* copy status into skb->cb for use by tasklet */
2242 memcpy(skb
->cb
, status
, sizeof(*status
));
2243 skb
->pkt_type
= IEEE80211_RX_MSG
;
2244 skb_queue_tail(&local
->skb_queue
, skb
);
2245 tasklet_schedule(&local
->tasklet
);
2247 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);