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"
29 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
30 struct tid_ampdu_rx
*tid_agg_rx
,
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
44 skb_pull(skb
, rtap_len
);
46 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
47 if (likely(skb
->len
> FCS_LEN
))
48 skb_trim(skb
, skb
->len
- FCS_LEN
);
60 static inline int should_drop_frame(struct ieee80211_rx_status
*status
,
65 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
67 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
69 if (unlikely(skb
->len
< 16 + present_fcs_len
+ radiotap_len
))
71 if (ieee80211_is_ctl(hdr
->frame_control
) &&
72 !ieee80211_is_pspoll(hdr
->frame_control
) &&
73 !ieee80211_is_back_req(hdr
->frame_control
))
79 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
80 struct ieee80211_rx_status
*status
)
84 /* always present fields */
85 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
87 if (status
->flag
& RX_FLAG_TSFT
)
89 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
91 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
94 if (len
& 1) /* padding for RX_FLAGS if necessary */
97 /* make sure radiotap starts at a naturally aligned address */
99 len
= roundup(len
, 8);
105 * ieee80211_add_rx_radiotap_header - add radiotap header
107 * add a radiotap header containing all the fields which the hardware provided.
110 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
112 struct ieee80211_rx_status
*status
,
113 struct ieee80211_rate
*rate
,
116 struct ieee80211_radiotap_header
*rthdr
;
119 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
120 memset(rthdr
, 0, rtap_len
);
122 /* radiotap header, set always present flags */
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
125 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
126 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
127 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
128 rthdr
->it_len
= cpu_to_le16(rtap_len
);
130 pos
= (unsigned char *)(rthdr
+1);
132 /* the order of the following fields is important */
134 /* IEEE80211_RADIOTAP_TSFT */
135 if (status
->flag
& RX_FLAG_TSFT
) {
136 *(__le64
*)pos
= cpu_to_le64(status
->mactime
);
138 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
142 /* IEEE80211_RADIOTAP_FLAGS */
143 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
144 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
145 if (status
->flag
& RX_FLAG_SHORTPRE
)
146 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
149 /* IEEE80211_RADIOTAP_RATE */
150 if (status
->flag
& RX_FLAG_HT
) {
152 * TODO: add following information into radiotap header once
153 * suitable fields are defined for it:
154 * - MCS index (status->rate_idx)
155 * - HT40 (status->flag & RX_FLAG_40MHZ)
156 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
161 *pos
= rate
->bitrate
/ 5;
165 /* IEEE80211_RADIOTAP_CHANNEL */
166 *(__le16
*)pos
= cpu_to_le16(status
->freq
);
168 if (status
->band
== IEEE80211_BAND_5GHZ
)
169 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
170 IEEE80211_CHAN_5GHZ
);
171 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
172 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
173 IEEE80211_CHAN_2GHZ
);
175 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_CCK
|
176 IEEE80211_CHAN_2GHZ
);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
181 *pos
= status
->signal
;
183 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
187 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
188 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
189 *pos
= status
->noise
;
191 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
195 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
197 /* IEEE80211_RADIOTAP_ANTENNA */
198 *pos
= status
->antenna
;
201 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
203 /* IEEE80211_RADIOTAP_RX_FLAGS */
204 /* ensure 2 byte alignment for the 2 byte field as required */
205 if ((pos
- (unsigned char *)rthdr
) & 1)
207 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
208 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
209 *(__le16
*)pos
|= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS
);
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
218 static struct sk_buff
*
219 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
220 struct ieee80211_rx_status
*status
,
221 struct ieee80211_rate
*rate
)
223 struct ieee80211_sub_if_data
*sdata
;
224 int needed_headroom
= 0;
225 struct sk_buff
*skb
, *skb2
;
226 struct net_device
*prev_dev
= NULL
;
227 int present_fcs_len
= 0;
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
238 if (status
->flag
& RX_FLAG_RADIOTAP
)
239 rtap_len
= ieee80211_get_radiotap_len(origskb
->data
);
241 /* room for the radiotap header based on driver features */
242 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
244 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
245 present_fcs_len
= FCS_LEN
;
247 if (!local
->monitors
) {
248 if (should_drop_frame(status
, origskb
, present_fcs_len
,
250 dev_kfree_skb(origskb
);
254 return remove_monitor_info(local
, origskb
, rtap_len
);
257 if (should_drop_frame(status
, origskb
, present_fcs_len
, rtap_len
)) {
258 /* only need to expand headroom if necessary */
263 * This shouldn't trigger often because most devices have an
264 * RX header they pull before we get here, and that should
265 * be big enough for our radiotap information. We should
266 * probably export the length to drivers so that we can have
267 * them allocate enough headroom to start with.
269 if (skb_headroom(skb
) < needed_headroom
&&
270 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
276 * Need to make a copy and possibly remove radiotap header
277 * and FCS from the original.
279 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
281 origskb
= remove_monitor_info(local
, origskb
, rtap_len
);
287 /* if necessary, prepend radiotap information */
288 if (!(status
->flag
& RX_FLAG_RADIOTAP
))
289 ieee80211_add_rx_radiotap_header(local
, skb
, status
, rate
,
292 skb_reset_mac_header(skb
);
293 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
294 skb
->pkt_type
= PACKET_OTHERHOST
;
295 skb
->protocol
= htons(ETH_P_802_2
);
297 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
298 if (!netif_running(sdata
->dev
))
301 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
304 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
308 skb2
= skb_clone(skb
, GFP_ATOMIC
);
310 skb2
->dev
= prev_dev
;
315 prev_dev
= sdata
->dev
;
316 sdata
->dev
->stats
.rx_packets
++;
317 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
330 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
332 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
335 /* does the frame have a qos control field? */
336 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
337 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
338 /* frame has qos control */
339 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
340 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
341 rx
->flags
|= IEEE80211_RX_AMSDU
;
343 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
346 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 * Sequence numbers for management frames, QoS data
349 * frames with a broadcast/multicast address in the
350 * Address 1 field, and all non-QoS data frames sent
351 * by QoS STAs are assigned using an additional single
352 * modulo-4096 counter, [...]
354 * We also use that counter for non-QoS STAs.
356 tid
= NUM_RX_DATA_QUEUES
- 1;
360 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
361 * For now, set skb->priority to 0 for other cases. */
362 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
366 * DOC: Packet alignment
368 * Drivers always need to pass packets that are aligned to two-byte boundaries
371 * Additionally, should, if possible, align the payload data in a way that
372 * guarantees that the contained IP header is aligned to a four-byte
373 * boundary. In the case of regular frames, this simply means aligning the
374 * payload to a four-byte boundary (because either the IP header is directly
375 * contained, or IV/RFC1042 headers that have a length divisible by four are
378 * With A-MSDU frames, however, the payload data address must yield two modulo
379 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
380 * push the IP header further back to a multiple of four again. Thankfully, the
381 * specs were sane enough this time around to require padding each A-MSDU
382 * subframe to a length that is a multiple of four.
384 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
385 * the payload is not supported, the driver is required to move the 802.11
386 * header to be directly in front of the payload in that case.
388 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
390 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
393 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
397 if (WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
398 "unaligned packet at 0x%p\n", rx
->skb
->data
))
401 if (!ieee80211_is_data_present(hdr
->frame_control
))
404 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
405 if (rx
->flags
& IEEE80211_RX_AMSDU
)
407 WARN_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3,
408 "unaligned IP payload at 0x%p\n", rx
->skb
->data
+ hdrlen
);
414 static ieee80211_rx_result debug_noinline
415 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
417 struct ieee80211_local
*local
= rx
->local
;
418 struct sk_buff
*skb
= rx
->skb
;
420 if (unlikely(local
->hw_scanning
))
421 return ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
);
423 if (unlikely(local
->sw_scanning
)) {
424 /* drop all the other packets during a software scan anyway */
425 if (ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
)
431 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
434 return RX_DROP_UNUSABLE
;
441 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
443 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
445 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
448 return ieee80211_is_robust_mgmt_frame(hdr
);
452 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
454 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
456 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
459 return ieee80211_is_robust_mgmt_frame(hdr
);
463 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
466 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
467 struct ieee80211_mmie
*mmie
;
469 if (skb
->len
< 24 + sizeof(*mmie
) ||
470 !is_multicast_ether_addr(hdr
->da
))
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
474 return -1; /* not a robust management frame */
476 mmie
= (struct ieee80211_mmie
*)
477 (skb
->data
+ skb
->len
- sizeof(*mmie
));
478 if (mmie
->element_id
!= WLAN_EID_MMIE
||
479 mmie
->length
!= sizeof(*mmie
) - 2)
482 return le16_to_cpu(mmie
->key_id
);
486 static ieee80211_rx_result
487 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
489 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
490 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
492 if (ieee80211_is_data(hdr
->frame_control
)) {
493 if (!ieee80211_has_a4(hdr
->frame_control
))
494 return RX_DROP_MONITOR
;
495 if (memcmp(hdr
->addr4
, rx
->dev
->dev_addr
, ETH_ALEN
) == 0)
496 return RX_DROP_MONITOR
;
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
503 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
504 struct ieee80211_mgmt
*mgmt
;
506 if (!ieee80211_is_mgmt(hdr
->frame_control
))
507 return RX_DROP_MONITOR
;
509 if (ieee80211_is_action(hdr
->frame_control
)) {
510 mgmt
= (struct ieee80211_mgmt
*)hdr
;
511 if (mgmt
->u
.action
.category
!= PLINK_CATEGORY
)
512 return RX_DROP_MONITOR
;
516 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
517 ieee80211_is_probe_resp(hdr
->frame_control
) ||
518 ieee80211_is_beacon(hdr
->frame_control
))
521 return RX_DROP_MONITOR
;
525 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
527 if (ieee80211_is_data(hdr
->frame_control
) &&
528 is_multicast_ether_addr(hdr
->addr1
) &&
529 mesh_rmc_check(hdr
->addr4
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
530 return RX_DROP_MONITOR
;
537 static ieee80211_rx_result debug_noinline
538 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
540 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
544 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
545 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
547 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
548 rx
->local
->dot11FrameDuplicateCount
++;
549 rx
->sta
->num_duplicates
++;
551 return RX_DROP_MONITOR
;
553 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
556 if (unlikely(rx
->skb
->len
< 16)) {
557 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
558 return RX_DROP_MONITOR
;
561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
570 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
571 return ieee80211_rx_mesh_check(rx
);
573 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
574 ieee80211_is_pspoll(hdr
->frame_control
)) &&
575 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
576 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
577 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
578 !ieee80211_has_tods(hdr
->frame_control
) &&
579 ieee80211_is_data(hdr
->frame_control
)) ||
580 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
581 /* Drop IBSS frames and frames for other hosts
583 return RX_DROP_MONITOR
;
586 return RX_DROP_MONITOR
;
593 static ieee80211_rx_result debug_noinline
594 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
596 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
599 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
600 struct ieee80211_key
*stakey
= NULL
;
601 int mmie_keyidx
= -1;
606 * There are four types of keys:
608 * - IGTK (group keys for management frames)
609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
630 if (!ieee80211_has_protected(hdr
->frame_control
)) {
631 if (!ieee80211_is_mgmt(hdr
->frame_control
) ||
632 rx
->sta
== NULL
|| !test_sta_flags(rx
->sta
, WLAN_STA_MFP
))
634 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
640 * No point in finding a key and decrypting if the frame is neither
641 * addressed to us nor a multicast frame.
643 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
647 stakey
= rcu_dereference(rx
->sta
->key
);
649 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
651 } else if (mmie_keyidx
>= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
654 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
657 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
658 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
659 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
660 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
663 * The device doesn't give us the IV so we won't be
664 * able to look up the key. That's ok though, we
665 * don't need to decrypt the frame, we just won't
666 * be able to keep statistics accurate.
667 * Except for key threshold notifications, should
668 * we somehow allow the driver to tell us which key
669 * the hardware used if this flag is set?
671 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
672 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
675 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
677 if (rx
->skb
->len
< 8 + hdrlen
)
678 return RX_DROP_UNUSABLE
; /* TODO: count this? */
681 * no need to call ieee80211_wep_get_keyidx,
682 * it verifies a bunch of things we've done already
684 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
686 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
689 * RSNA-protected unicast frames should always be sent with
690 * pairwise or station-to-station keys, but for WEP we allow
691 * using a key index as well.
693 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
694 !is_multicast_ether_addr(hdr
->addr1
))
699 rx
->key
->tx_rx_count
++;
700 /* TODO: add threshold stuff again */
702 return RX_DROP_MONITOR
;
705 /* Check for weak IVs if possible */
706 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
707 ieee80211_is_data(hdr
->frame_control
) &&
708 (!(rx
->status
->flag
& RX_FLAG_IV_STRIPPED
) ||
709 !(rx
->status
->flag
& RX_FLAG_DECRYPTED
)) &&
710 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
711 rx
->sta
->wep_weak_iv_count
++;
713 switch (rx
->key
->conf
.alg
) {
715 result
= ieee80211_crypto_wep_decrypt(rx
);
718 result
= ieee80211_crypto_tkip_decrypt(rx
);
721 result
= ieee80211_crypto_ccmp_decrypt(rx
);
724 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
728 /* either the frame has been decrypted or will be dropped */
729 rx
->status
->flag
|= RX_FLAG_DECRYPTED
;
734 static ieee80211_rx_result debug_noinline
735 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
737 struct ieee80211_local
*local
;
738 struct ieee80211_hdr
*hdr
;
743 hdr
= (struct ieee80211_hdr
*) skb
->data
;
745 if (!local
->pspolling
)
748 if (!ieee80211_has_fromds(hdr
->frame_control
))
749 /* this is not from AP */
752 if (!ieee80211_is_data(hdr
->frame_control
))
755 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
756 /* AP has no more frames buffered for us */
757 local
->pspolling
= false;
761 /* more data bit is set, let's request a new frame from the AP */
762 ieee80211_send_pspoll(local
, rx
->sdata
);
767 static void ap_sta_ps_start(struct sta_info
*sta
)
769 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
770 struct ieee80211_local
*local
= sdata
->local
;
772 atomic_inc(&sdata
->bss
->num_sta_ps
);
773 set_and_clear_sta_flags(sta
, WLAN_STA_PS
, WLAN_STA_PSPOLL
);
774 if (local
->ops
->sta_notify
)
775 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
776 STA_NOTIFY_SLEEP
, &sta
->sta
);
777 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
778 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
779 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
780 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
783 static int ap_sta_ps_end(struct sta_info
*sta
)
785 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
786 struct ieee80211_local
*local
= sdata
->local
;
790 atomic_dec(&sdata
->bss
->num_sta_ps
);
792 clear_sta_flags(sta
, WLAN_STA_PS
| WLAN_STA_PSPOLL
);
793 if (local
->ops
->sta_notify
)
794 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
795 STA_NOTIFY_AWAKE
, &sta
->sta
);
797 if (!skb_queue_empty(&sta
->ps_tx_buf
))
798 sta_info_clear_tim_bit(sta
);
800 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
801 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
802 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
803 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
805 /* Send all buffered frames to the station */
806 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
811 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
812 local
->total_ps_buffered
--;
814 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
815 printk(KERN_DEBUG
"%s: STA %pM aid %d send PS frame "
816 "since STA not sleeping anymore\n", sdata
->dev
->name
,
817 sta
->sta
.addr
, sta
->sta
.aid
);
818 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
829 struct sta_info
*sta
= rx
->sta
;
830 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
835 /* Update last_rx only for IBSS packets which are for the current
836 * BSSID to avoid keeping the current IBSS network alive in cases where
837 * other STAs are using different BSSID. */
838 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
839 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
840 NL80211_IFTYPE_ADHOC
);
841 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
842 sta
->last_rx
= jiffies
;
844 if (!is_multicast_ether_addr(hdr
->addr1
) ||
845 rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
846 /* Update last_rx only for unicast frames in order to prevent
847 * the Probe Request frames (the only broadcast frames from a
848 * STA in infrastructure mode) from keeping a connection alive.
849 * Mesh beacons will update last_rx when if they are found to
850 * match the current local configuration when processed.
852 sta
->last_rx
= jiffies
;
855 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
859 sta
->rx_bytes
+= rx
->skb
->len
;
860 sta
->last_signal
= rx
->status
->signal
;
861 sta
->last_qual
= rx
->status
->qual
;
862 sta
->last_noise
= rx
->status
->noise
;
865 * Change STA power saving mode only at the end of a frame
868 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
869 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
870 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
871 if (test_sta_flags(sta
, WLAN_STA_PS
)) {
873 * Ignore doze->wake transitions that are
874 * indicated by non-data frames, the standard
875 * is unclear here, but for example going to
876 * PS mode and then scanning would cause a
877 * doze->wake transition for the probe request,
878 * and that is clearly undesirable.
880 if (ieee80211_is_data(hdr
->frame_control
) &&
881 !ieee80211_has_pm(hdr
->frame_control
))
882 rx
->sent_ps_buffered
+= ap_sta_ps_end(sta
);
884 if (ieee80211_has_pm(hdr
->frame_control
))
885 ap_sta_ps_start(sta
);
889 /* Drop data::nullfunc frames silently, since they are used only to
890 * control station power saving mode. */
891 if (ieee80211_is_nullfunc(hdr
->frame_control
)) {
892 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
893 /* Update counter and free packet here to avoid counting this
894 * as a dropped packed. */
896 dev_kfree_skb(rx
->skb
);
901 } /* ieee80211_rx_h_sta_process */
903 static inline struct ieee80211_fragment_entry
*
904 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
905 unsigned int frag
, unsigned int seq
, int rx_queue
,
906 struct sk_buff
**skb
)
908 struct ieee80211_fragment_entry
*entry
;
911 idx
= sdata
->fragment_next
;
912 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
913 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
914 sdata
->fragment_next
= 0;
916 if (!skb_queue_empty(&entry
->skb_list
)) {
917 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
918 struct ieee80211_hdr
*hdr
=
919 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
920 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
921 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
922 "addr1=%pM addr2=%pM\n",
923 sdata
->dev
->name
, idx
,
924 jiffies
- entry
->first_frag_time
, entry
->seq
,
925 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
927 __skb_queue_purge(&entry
->skb_list
);
930 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
932 entry
->first_frag_time
= jiffies
;
934 entry
->rx_queue
= rx_queue
;
935 entry
->last_frag
= frag
;
937 entry
->extra_len
= 0;
942 static inline struct ieee80211_fragment_entry
*
943 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
944 unsigned int frag
, unsigned int seq
,
945 int rx_queue
, struct ieee80211_hdr
*hdr
)
947 struct ieee80211_fragment_entry
*entry
;
950 idx
= sdata
->fragment_next
;
951 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
952 struct ieee80211_hdr
*f_hdr
;
956 idx
= IEEE80211_FRAGMENT_MAX
- 1;
958 entry
= &sdata
->fragments
[idx
];
959 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
960 entry
->rx_queue
!= rx_queue
||
961 entry
->last_frag
+ 1 != frag
)
964 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
967 * Check ftype and addresses are equal, else check next fragment
969 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
970 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
971 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
972 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
975 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
976 __skb_queue_purge(&entry
->skb_list
);
985 static ieee80211_rx_result debug_noinline
986 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
988 struct ieee80211_hdr
*hdr
;
991 unsigned int frag
, seq
;
992 struct ieee80211_fragment_entry
*entry
;
995 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
996 fc
= hdr
->frame_control
;
997 sc
= le16_to_cpu(hdr
->seq_ctrl
);
998 frag
= sc
& IEEE80211_SCTL_FRAG
;
1000 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1001 (rx
->skb
)->len
< 24 ||
1002 is_multicast_ether_addr(hdr
->addr1
))) {
1003 /* not fragmented */
1006 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1008 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1011 /* This is the first fragment of a new frame. */
1012 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1013 rx
->queue
, &(rx
->skb
));
1014 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1015 ieee80211_has_protected(fc
)) {
1016 /* Store CCMP PN so that we can verify that the next
1017 * fragment has a sequential PN value. */
1019 memcpy(entry
->last_pn
,
1020 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1026 /* This is a fragment for a frame that should already be pending in
1027 * fragment cache. Add this fragment to the end of the pending entry.
1029 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1031 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1032 return RX_DROP_MONITOR
;
1035 /* Verify that MPDUs within one MSDU have sequential PN values.
1036 * (IEEE 802.11i, 8.3.3.4.5) */
1039 u8 pn
[CCMP_PN_LEN
], *rpn
;
1040 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1041 return RX_DROP_UNUSABLE
;
1042 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1043 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1048 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1049 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1050 return RX_DROP_UNUSABLE
;
1051 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1054 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1055 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1056 entry
->last_frag
= frag
;
1057 entry
->extra_len
+= rx
->skb
->len
;
1058 if (ieee80211_has_morefrags(fc
)) {
1063 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1064 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1065 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1066 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1068 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1069 __skb_queue_purge(&entry
->skb_list
);
1070 return RX_DROP_UNUSABLE
;
1073 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1074 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1078 /* Complete frame has been reassembled - process it now */
1079 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1083 rx
->sta
->rx_packets
++;
1084 if (is_multicast_ether_addr(hdr
->addr1
))
1085 rx
->local
->dot11MulticastReceivedFrameCount
++;
1087 ieee80211_led_rx(rx
->local
);
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1094 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1095 struct sk_buff
*skb
;
1096 int no_pending_pkts
;
1097 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1099 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1100 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1103 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1104 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1105 return RX_DROP_UNUSABLE
;
1107 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
1109 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
1111 rx
->local
->total_ps_buffered
--;
1113 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
1114 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
1117 struct ieee80211_hdr
*hdr
=
1118 (struct ieee80211_hdr
*) skb
->data
;
1121 * Tell TX path to send one frame even though the STA may
1122 * still remain is PS mode after this frame exchange.
1124 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1126 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1127 printk(KERN_DEBUG
"STA %pM aid %d: PS Poll (entries after %d)\n",
1128 rx
->sta
->sta
.addr
, rx
->sta
->sta
.aid
,
1129 skb_queue_len(&rx
->sta
->ps_tx_buf
));
1130 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132 /* Use MoreData flag to indicate whether there are more
1133 * buffered frames for this STA */
1134 if (no_pending_pkts
)
1135 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1137 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1139 dev_queue_xmit(skb
);
1141 if (no_pending_pkts
)
1142 sta_info_clear_tim_bit(rx
->sta
);
1143 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1144 } else if (!rx
->sent_ps_buffered
) {
1146 * FIXME: This can be the result of a race condition between
1147 * us expiring a frame and the station polling for it.
1148 * Should we send it a null-func frame indicating we
1149 * have nothing buffered for it?
1151 printk(KERN_DEBUG
"%s: STA %pM sent PS Poll even "
1152 "though there are no buffered frames for it\n",
1153 rx
->dev
->name
, rx
->sta
->sta
.addr
);
1154 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1157 /* Free PS Poll skb here instead of returning RX_DROP that would
1158 * count as an dropped frame. */
1159 dev_kfree_skb(rx
->skb
);
1164 static ieee80211_rx_result debug_noinline
1165 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1167 u8
*data
= rx
->skb
->data
;
1168 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1170 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1173 /* remove the qos control field, update frame type and meta-data */
1174 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1175 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1176 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1177 /* change frame type to non QOS */
1178 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1184 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1186 if (unlikely(!rx
->sta
||
1187 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1194 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1197 * Pass through unencrypted frames if the hardware has
1198 * decrypted them already.
1200 if (rx
->status
->flag
& RX_FLAG_DECRYPTED
)
1203 /* Drop unencrypted frames if key is set. */
1204 if (unlikely(!ieee80211_has_protected(fc
) &&
1205 !ieee80211_is_nullfunc(fc
) &&
1206 (!ieee80211_is_mgmt(fc
) ||
1207 (ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1208 rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
))) &&
1209 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1211 /* BIP does not use Protected field, so need to check MMIE */
1212 if (unlikely(rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
) &&
1213 ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1214 ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1215 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1222 ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1224 struct net_device
*dev
= rx
->dev
;
1225 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
1226 u16 hdrlen
, ethertype
;
1229 u8 src
[ETH_ALEN
] __aligned(2);
1230 struct sk_buff
*skb
= rx
->skb
;
1231 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1233 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1236 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1238 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1240 * IEEE 802.11 address fields:
1241 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1242 * 0 0 DA SA BSSID n/a
1243 * 0 1 DA BSSID SA n/a
1244 * 1 0 BSSID SA DA n/a
1247 memcpy(dst
, ieee80211_get_DA(hdr
), ETH_ALEN
);
1248 memcpy(src
, ieee80211_get_SA(hdr
), ETH_ALEN
);
1250 switch (hdr
->frame_control
&
1251 cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
1252 case cpu_to_le16(IEEE80211_FCTL_TODS
):
1253 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1254 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1257 case cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
1258 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1259 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
))
1261 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1262 struct ieee80211s_hdr
*meshdr
= (struct ieee80211s_hdr
*)
1263 (skb
->data
+ hdrlen
);
1264 hdrlen
+= ieee80211_get_mesh_hdrlen(meshdr
);
1265 if (meshdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
1266 memcpy(dst
, meshdr
->eaddr1
, ETH_ALEN
);
1267 memcpy(src
, meshdr
->eaddr2
, ETH_ALEN
);
1271 case cpu_to_le16(IEEE80211_FCTL_FROMDS
):
1272 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
||
1273 (is_multicast_ether_addr(dst
) &&
1274 !compare_ether_addr(src
, dev
->dev_addr
)))
1277 case cpu_to_le16(0):
1278 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1283 if (unlikely(skb
->len
- hdrlen
< 8))
1286 payload
= skb
->data
+ hdrlen
;
1287 ethertype
= (payload
[6] << 8) | payload
[7];
1289 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1290 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1291 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1292 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1293 * replace EtherType */
1294 skb_pull(skb
, hdrlen
+ 6);
1295 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1296 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1298 struct ethhdr
*ehdr
;
1301 skb_pull(skb
, hdrlen
);
1302 len
= htons(skb
->len
);
1303 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1304 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1305 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1306 ehdr
->h_proto
= len
;
1312 * requires that rx->skb is a frame with ethernet header
1314 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1316 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1317 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1318 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1321 * Allow EAPOL frames to us/the PAE group address regardless
1322 * of whether the frame was encrypted or not.
1324 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1325 (compare_ether_addr(ehdr
->h_dest
, rx
->dev
->dev_addr
) == 0 ||
1326 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1329 if (ieee80211_802_1x_port_control(rx
) ||
1330 ieee80211_drop_unencrypted(rx
, fc
))
1337 * requires that rx->skb is a frame with ethernet header
1340 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1342 struct net_device
*dev
= rx
->dev
;
1343 struct ieee80211_local
*local
= rx
->local
;
1344 struct sk_buff
*skb
, *xmit_skb
;
1345 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1346 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1347 struct sta_info
*dsta
;
1352 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1353 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1354 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1355 (rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
1356 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1358 * send multicast frames both to higher layers in
1359 * local net stack and back to the wireless medium
1361 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1362 if (!xmit_skb
&& net_ratelimit())
1363 printk(KERN_DEBUG
"%s: failed to clone "
1364 "multicast frame\n", dev
->name
);
1366 dsta
= sta_info_get(local
, skb
->data
);
1367 if (dsta
&& dsta
->sdata
->dev
== dev
) {
1369 * The destination station is associated to
1370 * this AP (in this VLAN), so send the frame
1371 * directly to it and do not pass it to local
1381 int align __maybe_unused
;
1383 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1385 * 'align' will only take the values 0 or 2 here
1386 * since all frames are required to be aligned
1387 * to 2-byte boundaries when being passed to
1388 * mac80211. That also explains the __skb_push()
1391 align
= (unsigned long)skb
->data
& 4;
1393 if (WARN_ON(skb_headroom(skb
) < 3)) {
1397 u8
*data
= skb
->data
;
1398 size_t len
= skb
->len
;
1399 u8
*new = __skb_push(skb
, align
);
1400 memmove(new, data
, len
);
1401 __skb_trim(skb
, len
);
1407 /* deliver to local stack */
1408 skb
->protocol
= eth_type_trans(skb
, dev
);
1409 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1415 /* send to wireless media */
1416 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1417 skb_reset_network_header(xmit_skb
);
1418 skb_reset_mac_header(xmit_skb
);
1419 dev_queue_xmit(xmit_skb
);
1423 static ieee80211_rx_result debug_noinline
1424 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1426 struct net_device
*dev
= rx
->dev
;
1427 struct ieee80211_local
*local
= rx
->local
;
1430 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1431 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1432 __le16 fc
= hdr
->frame_control
;
1433 const struct ethhdr
*eth
;
1438 if (unlikely(!ieee80211_is_data(fc
)))
1441 if (unlikely(!ieee80211_is_data_present(fc
)))
1442 return RX_DROP_MONITOR
;
1444 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1447 err
= ieee80211_data_to_8023(rx
);
1449 return RX_DROP_UNUSABLE
;
1453 dev
->stats
.rx_packets
++;
1454 dev
->stats
.rx_bytes
+= skb
->len
;
1456 /* skip the wrapping header */
1457 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1459 return RX_DROP_UNUSABLE
;
1461 while (skb
!= frame
) {
1463 __be16 len
= eth
->h_proto
;
1464 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1466 remaining
= skb
->len
;
1467 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1468 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1470 padding
= ((4 - subframe_len
) & 0x3);
1471 /* the last MSDU has no padding */
1472 if (subframe_len
> remaining
)
1473 return RX_DROP_UNUSABLE
;
1475 skb_pull(skb
, sizeof(struct ethhdr
));
1476 /* if last subframe reuse skb */
1477 if (remaining
<= subframe_len
+ padding
)
1481 * Allocate and reserve two bytes more for payload
1482 * alignment since sizeof(struct ethhdr) is 14.
1484 frame
= dev_alloc_skb(
1485 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1489 return RX_DROP_UNUSABLE
;
1492 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1493 sizeof(struct ethhdr
) + 2);
1494 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1497 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1500 dev_kfree_skb(frame
);
1501 return RX_DROP_UNUSABLE
;
1505 skb_reset_network_header(frame
);
1507 frame
->priority
= skb
->priority
;
1510 payload
= frame
->data
;
1511 ethertype
= (payload
[6] << 8) | payload
[7];
1513 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1514 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1515 compare_ether_addr(payload
,
1516 bridge_tunnel_header
) == 0)) {
1517 /* remove RFC1042 or Bridge-Tunnel
1518 * encapsulation and replace EtherType */
1520 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1521 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1523 memcpy(skb_push(frame
, sizeof(__be16
)),
1524 &len
, sizeof(__be16
));
1525 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1526 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1529 if (!ieee80211_frame_allowed(rx
, fc
)) {
1530 if (skb
== frame
) /* last frame */
1531 return RX_DROP_UNUSABLE
;
1532 dev_kfree_skb(frame
);
1536 ieee80211_deliver_skb(rx
);
1542 #ifdef CONFIG_MAC80211_MESH
1543 static ieee80211_rx_result
1544 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1546 struct ieee80211_hdr
*hdr
;
1547 struct ieee80211s_hdr
*mesh_hdr
;
1548 unsigned int hdrlen
;
1549 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1551 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1552 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1553 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1555 if (!ieee80211_is_data(hdr
->frame_control
))
1560 return RX_DROP_MONITOR
;
1562 if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
){
1563 struct ieee80211_sub_if_data
*sdata
;
1564 struct mesh_path
*mppath
;
1566 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1568 mppath
= mpp_path_lookup(mesh_hdr
->eaddr2
, sdata
);
1570 mpp_path_add(mesh_hdr
->eaddr2
, hdr
->addr4
, sdata
);
1572 spin_lock_bh(&mppath
->state_lock
);
1573 mppath
->exp_time
= jiffies
;
1574 if (compare_ether_addr(mppath
->mpp
, hdr
->addr4
) != 0)
1575 memcpy(mppath
->mpp
, hdr
->addr4
, ETH_ALEN
);
1576 spin_unlock_bh(&mppath
->state_lock
);
1581 if (compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr3
) == 0)
1586 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1588 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1589 dropped_frames_ttl
);
1591 struct ieee80211_hdr
*fwd_hdr
;
1592 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1594 if (!fwd_skb
&& net_ratelimit())
1595 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1598 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1600 * Save TA to addr1 to send TA a path error if a
1601 * suitable next hop is not found
1603 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
, ETH_ALEN
);
1604 memcpy(fwd_hdr
->addr2
, rx
->dev
->dev_addr
, ETH_ALEN
);
1605 fwd_skb
->dev
= rx
->local
->mdev
;
1606 fwd_skb
->iif
= rx
->dev
->ifindex
;
1607 dev_queue_xmit(fwd_skb
);
1611 if (is_multicast_ether_addr(hdr
->addr3
) ||
1612 rx
->dev
->flags
& IFF_PROMISC
)
1615 return RX_DROP_MONITOR
;
1619 static ieee80211_rx_result debug_noinline
1620 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1622 struct net_device
*dev
= rx
->dev
;
1623 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1624 __le16 fc
= hdr
->frame_control
;
1627 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1630 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1631 return RX_DROP_MONITOR
;
1633 err
= ieee80211_data_to_8023(rx
);
1635 return RX_DROP_UNUSABLE
;
1637 if (!ieee80211_frame_allowed(rx
, fc
))
1638 return RX_DROP_MONITOR
;
1642 dev
->stats
.rx_packets
++;
1643 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1645 ieee80211_deliver_skb(rx
);
1650 static ieee80211_rx_result debug_noinline
1651 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
1653 struct ieee80211_local
*local
= rx
->local
;
1654 struct ieee80211_hw
*hw
= &local
->hw
;
1655 struct sk_buff
*skb
= rx
->skb
;
1656 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1657 struct tid_ampdu_rx
*tid_agg_rx
;
1661 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1664 if (ieee80211_is_back_req(bar
->frame_control
)) {
1667 tid
= le16_to_cpu(bar
->control
) >> 12;
1668 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1669 != HT_AGG_STATE_OPERATIONAL
)
1671 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1673 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1675 /* reset session timer */
1676 if (tid_agg_rx
->timeout
)
1677 mod_timer(&tid_agg_rx
->session_timer
,
1678 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1680 /* manage reordering buffer according to requested */
1681 /* sequence number */
1683 ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, NULL
,
1686 return RX_DROP_UNUSABLE
;
1692 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1693 struct ieee80211_mgmt
*mgmt
,
1696 struct ieee80211_local
*local
= sdata
->local
;
1697 struct sk_buff
*skb
;
1698 struct ieee80211_mgmt
*resp
;
1700 if (compare_ether_addr(mgmt
->da
, sdata
->dev
->dev_addr
) != 0) {
1701 /* Not to own unicast address */
1705 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1706 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1707 /* Not from the current AP. */
1711 if (sdata
->u
.mgd
.state
== IEEE80211_STA_MLME_ASSOCIATE
) {
1712 /* Association in progress; ignore SA Query */
1716 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1717 /* Too short SA Query request frame */
1721 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1725 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1726 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1727 memset(resp
, 0, 24);
1728 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1729 memcpy(resp
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1730 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1731 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1732 IEEE80211_STYPE_ACTION
);
1733 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1734 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1735 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1736 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1737 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1738 WLAN_SA_QUERY_TR_ID_LEN
);
1740 ieee80211_tx_skb(sdata
, skb
, 1);
1743 static ieee80211_rx_result debug_noinline
1744 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1746 struct ieee80211_local
*local
= rx
->local
;
1747 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1748 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1749 struct ieee80211_bss
*bss
;
1750 int len
= rx
->skb
->len
;
1752 if (!ieee80211_is_action(mgmt
->frame_control
))
1756 return RX_DROP_MONITOR
;
1758 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1759 return RX_DROP_MONITOR
;
1761 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1762 return RX_DROP_MONITOR
;
1764 /* all categories we currently handle have action_code */
1765 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1766 return RX_DROP_MONITOR
;
1768 switch (mgmt
->u
.action
.category
) {
1769 case WLAN_CATEGORY_BACK
:
1771 * The aggregation code is not prepared to handle
1772 * anything but STA/AP due to the BSSID handling;
1773 * IBSS could work in the code but isn't supported
1774 * by drivers or the standard.
1776 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1777 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1778 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1779 return RX_DROP_MONITOR
;
1781 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1782 case WLAN_ACTION_ADDBA_REQ
:
1783 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1784 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1785 return RX_DROP_MONITOR
;
1786 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1788 case WLAN_ACTION_ADDBA_RESP
:
1789 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1790 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1791 return RX_DROP_MONITOR
;
1792 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1794 case WLAN_ACTION_DELBA
:
1795 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1796 sizeof(mgmt
->u
.action
.u
.delba
)))
1797 return RX_DROP_MONITOR
;
1798 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1802 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1803 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1804 return RX_DROP_MONITOR
;
1806 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1807 return RX_DROP_MONITOR
;
1809 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1810 case WLAN_ACTION_SPCT_MSR_REQ
:
1811 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1812 sizeof(mgmt
->u
.action
.u
.measurement
)))
1813 return RX_DROP_MONITOR
;
1814 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1816 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1817 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1818 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1819 return RX_DROP_MONITOR
;
1821 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1822 return RX_DROP_MONITOR
;
1824 bss
= ieee80211_rx_bss_get(local
, sdata
->u
.mgd
.bssid
,
1825 local
->hw
.conf
.channel
->center_freq
,
1827 sdata
->u
.mgd
.ssid_len
);
1829 return RX_DROP_MONITOR
;
1831 ieee80211_process_chanswitch(sdata
,
1832 &mgmt
->u
.action
.u
.chan_switch
.sw_elem
, bss
);
1833 ieee80211_rx_bss_put(local
, bss
);
1837 case WLAN_CATEGORY_SA_QUERY
:
1838 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1839 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1840 return RX_DROP_MONITOR
;
1841 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1842 case WLAN_ACTION_SA_QUERY_REQUEST
:
1843 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1844 return RX_DROP_MONITOR
;
1845 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1847 case WLAN_ACTION_SA_QUERY_RESPONSE
:
1849 * SA Query response is currently only used in AP mode
1850 * and it is processed in user space.
1859 rx
->sta
->rx_packets
++;
1860 dev_kfree_skb(rx
->skb
);
1864 static ieee80211_rx_result debug_noinline
1865 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
1867 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1868 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1870 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1871 return RX_DROP_MONITOR
;
1873 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1874 return RX_DROP_MONITOR
;
1876 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1877 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1879 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1880 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1881 return RX_DROP_MONITOR
;
1884 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
1885 if (sdata
->flags
& IEEE80211_SDATA_USERSPACE_MLME
)
1886 return RX_DROP_MONITOR
;
1887 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1890 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1893 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1894 struct ieee80211_hdr
*hdr
,
1895 struct ieee80211_rx_data
*rx
)
1898 unsigned int hdrlen
;
1900 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1901 if (rx
->skb
->len
>= hdrlen
+ 4)
1902 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1908 * Some hardware seem to generate incorrect Michael MIC
1909 * reports; ignore them to avoid triggering countermeasures.
1914 if (!ieee80211_has_protected(hdr
->frame_control
))
1917 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
1919 * APs with pairwise keys should never receive Michael MIC
1920 * errors for non-zero keyidx because these are reserved for
1921 * group keys and only the AP is sending real multicast
1922 * frames in the BSS.
1927 if (!ieee80211_is_data(hdr
->frame_control
) &&
1928 !ieee80211_is_auth(hdr
->frame_control
))
1931 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
);
1933 dev_kfree_skb(rx
->skb
);
1937 /* TODO: use IEEE80211_RX_FRAGMENTED */
1938 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
)
1940 struct ieee80211_sub_if_data
*sdata
;
1941 struct ieee80211_local
*local
= rx
->local
;
1942 struct ieee80211_rtap_hdr
{
1943 struct ieee80211_radiotap_header hdr
;
1948 } __attribute__ ((packed
)) *rthdr
;
1949 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1950 struct net_device
*prev_dev
= NULL
;
1951 struct ieee80211_rx_status
*status
= rx
->status
;
1953 if (rx
->flags
& IEEE80211_RX_CMNTR_REPORTED
)
1956 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
1957 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
1960 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
1961 memset(rthdr
, 0, sizeof(*rthdr
));
1962 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
1963 rthdr
->hdr
.it_present
=
1964 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
1965 (1 << IEEE80211_RADIOTAP_RATE
) |
1966 (1 << IEEE80211_RADIOTAP_CHANNEL
));
1968 rthdr
->rate
= rx
->rate
->bitrate
/ 5;
1969 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
1971 if (status
->band
== IEEE80211_BAND_5GHZ
)
1972 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
1973 IEEE80211_CHAN_5GHZ
);
1975 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
1976 IEEE80211_CHAN_2GHZ
);
1978 skb_set_mac_header(skb
, 0);
1979 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1980 skb
->pkt_type
= PACKET_OTHERHOST
;
1981 skb
->protocol
= htons(ETH_P_802_2
);
1983 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1984 if (!netif_running(sdata
->dev
))
1987 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
1988 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
1992 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1994 skb2
->dev
= prev_dev
;
1999 prev_dev
= sdata
->dev
;
2000 sdata
->dev
->stats
.rx_packets
++;
2001 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2005 skb
->dev
= prev_dev
;
2011 rx
->flags
|= IEEE80211_RX_CMNTR_REPORTED
;
2019 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2020 struct ieee80211_rx_data
*rx
,
2021 struct sk_buff
*skb
)
2023 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2027 rx
->dev
= sdata
->dev
;
2029 #define CALL_RXH(rxh) \
2032 if (res != RX_CONTINUE) \
2036 CALL_RXH(ieee80211_rx_h_passive_scan
)
2037 CALL_RXH(ieee80211_rx_h_check
)
2038 CALL_RXH(ieee80211_rx_h_decrypt
)
2039 CALL_RXH(ieee80211_rx_h_check_more_data
)
2040 CALL_RXH(ieee80211_rx_h_sta_process
)
2041 CALL_RXH(ieee80211_rx_h_defragment
)
2042 CALL_RXH(ieee80211_rx_h_ps_poll
)
2043 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2044 /* must be after MMIC verify so header is counted in MPDU mic */
2045 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2046 CALL_RXH(ieee80211_rx_h_amsdu
)
2047 #ifdef CONFIG_MAC80211_MESH
2048 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2049 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2051 CALL_RXH(ieee80211_rx_h_data
)
2052 CALL_RXH(ieee80211_rx_h_ctrl
)
2053 CALL_RXH(ieee80211_rx_h_action
)
2054 CALL_RXH(ieee80211_rx_h_mgmt
)
2060 case RX_DROP_MONITOR
:
2061 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2063 rx
->sta
->rx_dropped
++;
2066 ieee80211_rx_cooked_monitor(rx
);
2068 case RX_DROP_UNUSABLE
:
2069 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2071 rx
->sta
->rx_dropped
++;
2072 dev_kfree_skb(rx
->skb
);
2075 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2080 /* main receive path */
2082 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2083 struct ieee80211_rx_data
*rx
,
2084 struct ieee80211_hdr
*hdr
)
2086 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
, sdata
->vif
.type
);
2087 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2089 switch (sdata
->vif
.type
) {
2090 case NL80211_IFTYPE_STATION
:
2093 if (!ieee80211_bssid_match(bssid
, sdata
->u
.mgd
.bssid
)) {
2094 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2096 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2097 } else if (!multicast
&&
2098 compare_ether_addr(sdata
->dev
->dev_addr
,
2100 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2102 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2105 case NL80211_IFTYPE_ADHOC
:
2108 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2111 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2112 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2114 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2115 } else if (!multicast
&&
2116 compare_ether_addr(sdata
->dev
->dev_addr
,
2118 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2120 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2121 } else if (!rx
->sta
) {
2123 if (rx
->status
->flag
& RX_FLAG_HT
)
2124 rate_idx
= 0; /* TODO: HT rates */
2126 rate_idx
= rx
->status
->rate_idx
;
2127 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
, hdr
->addr2
,
2131 case NL80211_IFTYPE_MESH_POINT
:
2133 compare_ether_addr(sdata
->dev
->dev_addr
,
2135 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2138 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2141 case NL80211_IFTYPE_AP_VLAN
:
2142 case NL80211_IFTYPE_AP
:
2144 if (compare_ether_addr(sdata
->dev
->dev_addr
,
2147 } else if (!ieee80211_bssid_match(bssid
,
2148 sdata
->dev
->dev_addr
)) {
2149 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2151 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2154 case NL80211_IFTYPE_WDS
:
2155 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2157 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2160 case NL80211_IFTYPE_MONITOR
:
2161 /* take everything */
2163 case NL80211_IFTYPE_UNSPECIFIED
:
2164 case __NL80211_IFTYPE_AFTER_LAST
:
2165 /* should never get here */
2174 * This is the actual Rx frames handler. as it blongs to Rx path it must
2175 * be called with rcu_read_lock protection.
2177 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2178 struct sk_buff
*skb
,
2179 struct ieee80211_rx_status
*status
,
2180 struct ieee80211_rate
*rate
)
2182 struct ieee80211_local
*local
= hw_to_local(hw
);
2183 struct ieee80211_sub_if_data
*sdata
;
2184 struct ieee80211_hdr
*hdr
;
2185 struct ieee80211_rx_data rx
;
2187 struct ieee80211_sub_if_data
*prev
= NULL
;
2188 struct sk_buff
*skb_new
;
2190 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2191 memset(&rx
, 0, sizeof(rx
));
2198 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2199 local
->dot11ReceivedFragmentCount
++;
2201 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
2203 rx
.sdata
= rx
.sta
->sdata
;
2204 rx
.dev
= rx
.sta
->sdata
->dev
;
2207 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
2208 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, &rx
);
2212 if (unlikely(local
->sw_scanning
|| local
->hw_scanning
))
2213 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2215 ieee80211_parse_qos(&rx
);
2216 ieee80211_verify_alignment(&rx
);
2220 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2221 if (!netif_running(sdata
->dev
))
2224 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)
2227 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2228 prepares
= prepare_for_handlers(sdata
, &rx
, hdr
);
2234 * frame is destined for this interface, but if it's not
2235 * also for the previous one we handle that after the
2236 * loop to avoid copying the SKB once too much
2245 * frame was destined for the previous interface
2246 * so invoke RX handlers for it
2249 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2251 if (net_ratelimit())
2252 printk(KERN_DEBUG
"%s: failed to copy "
2253 "multicast frame for %s\n",
2254 wiphy_name(local
->hw
.wiphy
),
2258 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
2262 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
2267 #define SEQ_MODULO 0x1000
2268 #define SEQ_MASK 0xfff
2270 static inline int seq_less(u16 sq1
, u16 sq2
)
2272 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
2275 static inline u16
seq_inc(u16 sq
)
2277 return (sq
+ 1) & SEQ_MASK
;
2280 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
2282 return (sq1
- sq2
) & SEQ_MASK
;
2287 * As it function blongs to Rx path it must be called with
2288 * the proper rcu_read_lock protection for its flow.
2290 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
2291 struct tid_ampdu_rx
*tid_agg_rx
,
2292 struct sk_buff
*skb
,
2296 struct ieee80211_local
*local
= hw_to_local(hw
);
2297 struct ieee80211_rx_status status
;
2298 u16 head_seq_num
, buf_size
;
2300 struct ieee80211_supported_band
*sband
;
2301 struct ieee80211_rate
*rate
;
2303 buf_size
= tid_agg_rx
->buf_size
;
2304 head_seq_num
= tid_agg_rx
->head_seq_num
;
2306 /* frame with out of date sequence number */
2307 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
2312 /* if frame sequence number exceeds our buffering window size or
2313 * block Ack Request arrived - release stored frames */
2314 if ((!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) || (bar_req
)) {
2315 /* new head to the ordering buffer */
2317 head_seq_num
= mpdu_seq_num
;
2320 seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
2321 /* release stored frames up to new head to stack */
2322 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
2323 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2325 % tid_agg_rx
->buf_size
;
2327 if (tid_agg_rx
->reorder_buf
[index
]) {
2328 /* release the reordered frames to stack */
2330 tid_agg_rx
->reorder_buf
[index
]->cb
,
2332 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2333 if (status
.flag
& RX_FLAG_HT
) {
2334 /* TODO: HT rates */
2335 rate
= sband
->bitrates
;
2337 rate
= &sband
->bitrates
2340 __ieee80211_rx_handle_packet(hw
,
2341 tid_agg_rx
->reorder_buf
[index
],
2343 tid_agg_rx
->stored_mpdu_num
--;
2344 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2346 tid_agg_rx
->head_seq_num
=
2347 seq_inc(tid_agg_rx
->head_seq_num
);
2353 /* now the new frame is always in the range of the reordering */
2355 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
)
2356 % tid_agg_rx
->buf_size
;
2357 /* check if we already stored this frame */
2358 if (tid_agg_rx
->reorder_buf
[index
]) {
2363 /* if arrived mpdu is in the right order and nothing else stored */
2364 /* release it immediately */
2365 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
2366 tid_agg_rx
->stored_mpdu_num
== 0) {
2367 tid_agg_rx
->head_seq_num
=
2368 seq_inc(tid_agg_rx
->head_seq_num
);
2372 /* put the frame in the reordering buffer */
2373 tid_agg_rx
->reorder_buf
[index
] = skb
;
2374 tid_agg_rx
->stored_mpdu_num
++;
2375 /* release the buffer until next missing frame */
2376 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
)
2377 % tid_agg_rx
->buf_size
;
2378 while (tid_agg_rx
->reorder_buf
[index
]) {
2379 /* release the reordered frame back to stack */
2380 memcpy(&status
, tid_agg_rx
->reorder_buf
[index
]->cb
,
2382 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2383 if (status
.flag
& RX_FLAG_HT
)
2384 rate
= sband
->bitrates
; /* TODO: HT rates */
2386 rate
= &sband
->bitrates
[status
.rate_idx
];
2387 __ieee80211_rx_handle_packet(hw
, tid_agg_rx
->reorder_buf
[index
],
2389 tid_agg_rx
->stored_mpdu_num
--;
2390 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2391 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
2392 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2393 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
2398 static u8
ieee80211_rx_reorder_ampdu(struct ieee80211_local
*local
,
2399 struct sk_buff
*skb
)
2401 struct ieee80211_hw
*hw
= &local
->hw
;
2402 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
2403 struct sta_info
*sta
;
2404 struct tid_ampdu_rx
*tid_agg_rx
;
2410 sta
= sta_info_get(local
, hdr
->addr2
);
2414 /* filter the QoS data rx stream according to
2415 * STA/TID and check if this STA/TID is on aggregation */
2416 if (!ieee80211_is_data_qos(hdr
->frame_control
))
2419 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
2421 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
2424 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
2426 /* qos null data frames are excluded */
2427 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
2430 /* new un-ordered ampdu frame - process it */
2432 /* reset session timer */
2433 if (tid_agg_rx
->timeout
)
2434 mod_timer(&tid_agg_rx
->session_timer
,
2435 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2437 /* if this mpdu is fragmented - terminate rx aggregation session */
2438 sc
= le16_to_cpu(hdr
->seq_ctrl
);
2439 if (sc
& IEEE80211_SCTL_FRAG
) {
2440 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
2441 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
2446 /* according to mpdu sequence number deal with reordering buffer */
2447 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
2448 ret
= ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
,
2455 * This is the receive path handler. It is called by a low level driver when an
2456 * 802.11 MPDU is received from the hardware.
2458 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2459 struct ieee80211_rx_status
*status
)
2461 struct ieee80211_local
*local
= hw_to_local(hw
);
2462 struct ieee80211_rate
*rate
= NULL
;
2463 struct ieee80211_supported_band
*sband
;
2465 if (status
->band
< 0 ||
2466 status
->band
>= IEEE80211_NUM_BANDS
) {
2471 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2477 if (status
->flag
& RX_FLAG_HT
) {
2478 /* rate_idx is MCS index */
2479 if (WARN_ON(status
->rate_idx
< 0 ||
2480 status
->rate_idx
>= 76))
2482 /* HT rates are not in the table - use the highest legacy rate
2483 * for now since other parts of mac80211 may not yet be fully
2485 rate
= &sband
->bitrates
[sband
->n_bitrates
- 1];
2487 if (WARN_ON(status
->rate_idx
< 0 ||
2488 status
->rate_idx
>= sband
->n_bitrates
))
2490 rate
= &sband
->bitrates
[status
->rate_idx
];
2494 * key references and virtual interfaces are protected using RCU
2495 * and this requires that we are in a read-side RCU section during
2496 * receive processing
2501 * Frames with failed FCS/PLCP checksum are not returned,
2502 * all other frames are returned without radiotap header
2503 * if it was previously present.
2504 * Also, frames with less than 16 bytes are dropped.
2506 skb
= ieee80211_rx_monitor(local
, skb
, status
, rate
);
2512 if (!ieee80211_rx_reorder_ampdu(local
, skb
))
2513 __ieee80211_rx_handle_packet(hw
, skb
, status
, rate
);
2517 EXPORT_SYMBOL(__ieee80211_rx
);
2519 /* This is a version of the rx handler that can be called from hard irq
2520 * context. Post the skb on the queue and schedule the tasklet */
2521 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2522 struct ieee80211_rx_status
*status
)
2524 struct ieee80211_local
*local
= hw_to_local(hw
);
2526 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2528 skb
->dev
= local
->mdev
;
2529 /* copy status into skb->cb for use by tasklet */
2530 memcpy(skb
->cb
, status
, sizeof(*status
));
2531 skb
->pkt_type
= IEEE80211_RX_MSG
;
2532 skb_queue_tail(&local
->skb_queue
, skb
);
2533 tasklet_schedule(&local
->tasklet
);
2535 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);