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 2007-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/jiffies.h>
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
35 static inline void ieee80211_rx_stats(struct net_device
*dev
, u32 len
)
37 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
39 u64_stats_update_begin(&tstats
->syncp
);
41 tstats
->rx_bytes
+= len
;
42 u64_stats_update_end(&tstats
->syncp
);
45 static u8
*ieee80211_get_bssid(struct ieee80211_hdr
*hdr
, size_t len
,
46 enum nl80211_iftype type
)
48 __le16 fc
= hdr
->frame_control
;
50 if (ieee80211_is_data(fc
)) {
51 if (len
< 24) /* drop incorrect hdr len (data) */
54 if (ieee80211_has_a4(fc
))
56 if (ieee80211_has_tods(fc
))
58 if (ieee80211_has_fromds(fc
))
64 if (ieee80211_is_mgmt(fc
)) {
65 if (len
< 24) /* drop incorrect hdr len (mgmt) */
70 if (ieee80211_is_ctl(fc
)) {
71 if (ieee80211_is_pspoll(fc
))
74 if (ieee80211_is_back_req(fc
)) {
76 case NL80211_IFTYPE_STATION
:
78 case NL80211_IFTYPE_AP
:
79 case NL80211_IFTYPE_AP_VLAN
:
82 break; /* fall through to the return */
91 * monitor mode reception
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
96 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
98 unsigned int rtap_vendor_space
)
100 if (ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
)) {
101 if (likely(skb
->len
> FCS_LEN
))
102 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
111 __pskb_pull(skb
, rtap_vendor_space
);
116 static inline bool should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
,
117 unsigned int rtap_vendor_space
)
119 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
120 struct ieee80211_hdr
*hdr
;
122 hdr
= (void *)(skb
->data
+ rtap_vendor_space
);
124 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
125 RX_FLAG_FAILED_PLCP_CRC
))
128 if (unlikely(skb
->len
< 16 + present_fcs_len
+ rtap_vendor_space
))
131 if (ieee80211_is_ctl(hdr
->frame_control
) &&
132 !ieee80211_is_pspoll(hdr
->frame_control
) &&
133 !ieee80211_is_back_req(hdr
->frame_control
))
140 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local
*local
,
141 struct ieee80211_rx_status
*status
,
146 /* always present fields */
147 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
149 /* allocate extra bitmaps */
151 len
+= 4 * hweight8(status
->chains
);
153 if (ieee80211_have_rx_timestamp(status
)) {
157 if (ieee80211_hw_check(&local
->hw
, SIGNAL_DBM
))
160 /* antenna field, if we don't have per-chain info */
164 /* padding for RX_FLAGS if necessary */
167 if (status
->flag
& RX_FLAG_HT
) /* HT info */
170 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
175 if (status
->flag
& RX_FLAG_VHT
) {
180 if (status
->chains
) {
181 /* antenna and antenna signal fields */
182 len
+= 2 * hweight8(status
->chains
);
185 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
186 struct ieee80211_vendor_radiotap
*rtap
= (void *)skb
->data
;
188 /* vendor presence bitmap */
190 /* alignment for fixed 6-byte vendor data header */
192 /* vendor data header */
194 if (WARN_ON(rtap
->align
== 0))
196 len
= ALIGN(len
, rtap
->align
);
197 len
+= rtap
->len
+ rtap
->pad
;
204 * ieee80211_add_rx_radiotap_header - add radiotap header
206 * add a radiotap header containing all the fields which the hardware provided.
209 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
211 struct ieee80211_rate
*rate
,
212 int rtap_len
, bool has_fcs
)
214 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
215 struct ieee80211_radiotap_header
*rthdr
;
220 u16 channel_flags
= 0;
222 unsigned long chains
= status
->chains
;
223 struct ieee80211_vendor_radiotap rtap
= {};
225 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
226 rtap
= *(struct ieee80211_vendor_radiotap
*)skb
->data
;
227 /* rtap.len and rtap.pad are undone immediately */
228 skb_pull(skb
, sizeof(rtap
) + rtap
.len
+ rtap
.pad
);
232 if (!(has_fcs
&& ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
)))
235 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
236 memset(rthdr
, 0, rtap_len
- rtap
.len
- rtap
.pad
);
237 it_present
= &rthdr
->it_present
;
239 /* radiotap header, set always present flags */
240 rthdr
->it_len
= cpu_to_le16(rtap_len
);
241 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
242 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
243 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
246 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
248 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
250 BIT(IEEE80211_RADIOTAP_EXT
) |
251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
252 put_unaligned_le32(it_present_val
, it_present
);
254 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
258 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
259 it_present_val
|= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE
) |
260 BIT(IEEE80211_RADIOTAP_EXT
);
261 put_unaligned_le32(it_present_val
, it_present
);
263 it_present_val
= rtap
.present
;
266 put_unaligned_le32(it_present_val
, it_present
);
268 pos
= (void *)(it_present
+ 1);
270 /* the order of the following fields is important */
272 /* IEEE80211_RADIOTAP_TSFT */
273 if (ieee80211_have_rx_timestamp(status
)) {
275 while ((pos
- (u8
*)rthdr
) & 7)
278 ieee80211_calculate_rx_timestamp(local
, status
,
281 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
285 /* IEEE80211_RADIOTAP_FLAGS */
286 if (has_fcs
&& ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
))
287 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
288 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
289 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
290 if (status
->flag
& RX_FLAG_SHORTPRE
)
291 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
294 /* IEEE80211_RADIOTAP_RATE */
295 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
297 * Without rate information don't add it. If we have,
298 * MCS information is a separate field in radiotap,
299 * added below. The byte here is needed as padding
300 * for the channel though, so initialise it to 0.
305 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
306 if (status
->flag
& RX_FLAG_10MHZ
)
308 else if (status
->flag
& RX_FLAG_5MHZ
)
310 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
314 /* IEEE80211_RADIOTAP_CHANNEL */
315 put_unaligned_le16(status
->freq
, pos
);
317 if (status
->flag
& RX_FLAG_10MHZ
)
318 channel_flags
|= IEEE80211_CHAN_HALF
;
319 else if (status
->flag
& RX_FLAG_5MHZ
)
320 channel_flags
|= IEEE80211_CHAN_QUARTER
;
322 if (status
->band
== IEEE80211_BAND_5GHZ
)
323 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
324 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
325 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
326 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
327 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
329 channel_flags
|= IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
;
331 channel_flags
|= IEEE80211_CHAN_2GHZ
;
332 put_unaligned_le16(channel_flags
, pos
);
335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
336 if (ieee80211_hw_check(&local
->hw
, SIGNAL_DBM
) &&
337 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
338 *pos
= status
->signal
;
340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
346 if (!status
->chains
) {
347 /* IEEE80211_RADIOTAP_ANTENNA */
348 *pos
= status
->antenna
;
352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
354 /* IEEE80211_RADIOTAP_RX_FLAGS */
355 /* ensure 2 byte alignment for the 2 byte field as required */
356 if ((pos
- (u8
*)rthdr
) & 1)
358 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
359 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
360 put_unaligned_le16(rx_flags
, pos
);
363 if (status
->flag
& RX_FLAG_HT
) {
366 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
367 *pos
++ = local
->hw
.radiotap_mcs_details
;
369 if (status
->flag
& RX_FLAG_SHORT_GI
)
370 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
371 if (status
->flag
& RX_FLAG_40MHZ
)
372 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
373 if (status
->flag
& RX_FLAG_HT_GF
)
374 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
375 if (status
->flag
& RX_FLAG_LDPC
)
376 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
377 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
378 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
380 *pos
++ = status
->rate_idx
;
383 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
386 /* ensure 4 byte alignment */
387 while ((pos
- (u8
*)rthdr
) & 3)
390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
391 put_unaligned_le32(status
->ampdu_reference
, pos
);
393 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
394 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
395 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
396 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
397 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
398 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
399 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
400 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
401 put_unaligned_le16(flags
, pos
);
403 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
404 *pos
++ = status
->ampdu_delimiter_crc
;
410 if (status
->flag
& RX_FLAG_VHT
) {
411 u16 known
= local
->hw
.radiotap_vht_details
;
413 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
414 put_unaligned_le16(known
, pos
);
417 if (status
->flag
& RX_FLAG_SHORT_GI
)
418 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
419 /* in VHT, STBC is binary */
420 if (status
->flag
& RX_FLAG_STBC_MASK
)
421 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
422 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
423 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
426 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
428 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
430 else if (status
->flag
& RX_FLAG_40MHZ
)
435 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
438 if (status
->flag
& RX_FLAG_LDPC
)
439 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
447 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
448 *pos
++ = status
->chain_signal
[chain
];
452 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
453 /* ensure 2 byte alignment for the vendor field as required */
454 if ((pos
- (u8
*)rthdr
) & 1)
456 *pos
++ = rtap
.oui
[0];
457 *pos
++ = rtap
.oui
[1];
458 *pos
++ = rtap
.oui
[2];
460 put_unaligned_le16(rtap
.len
, pos
);
462 /* align the actual payload as requested */
463 while ((pos
- (u8
*)rthdr
) & (rtap
.align
- 1))
465 /* data (and possible padding) already follows */
470 * This function copies a received frame to all monitor interfaces and
471 * returns a cleaned-up SKB that no longer includes the FCS nor the
472 * radiotap header the driver might have added.
474 static struct sk_buff
*
475 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
476 struct ieee80211_rate
*rate
)
478 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
479 struct ieee80211_sub_if_data
*sdata
;
480 int rt_hdrlen
, needed_headroom
;
481 struct sk_buff
*skb
, *skb2
;
482 struct net_device
*prev_dev
= NULL
;
483 int present_fcs_len
= 0;
484 unsigned int rtap_vendor_space
= 0;
486 if (unlikely(status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
)) {
487 struct ieee80211_vendor_radiotap
*rtap
= (void *)origskb
->data
;
489 rtap_vendor_space
= sizeof(*rtap
) + rtap
->len
+ rtap
->pad
;
493 * First, we may need to make a copy of the skb because
494 * (1) we need to modify it for radiotap (if not present), and
495 * (2) the other RX handlers will modify the skb we got.
497 * We don't need to, of course, if we aren't going to return
498 * the SKB because it has a bad FCS/PLCP checksum.
501 if (ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
))
502 present_fcs_len
= FCS_LEN
;
504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
505 if (!pskb_may_pull(origskb
, 2 + rtap_vendor_space
)) {
506 dev_kfree_skb(origskb
);
510 if (!local
->monitors
) {
511 if (should_drop_frame(origskb
, present_fcs_len
,
512 rtap_vendor_space
)) {
513 dev_kfree_skb(origskb
);
517 return remove_monitor_info(local
, origskb
, rtap_vendor_space
);
520 /* room for the radiotap header based on driver features */
521 rt_hdrlen
= ieee80211_rx_radiotap_hdrlen(local
, status
, origskb
);
522 needed_headroom
= rt_hdrlen
- rtap_vendor_space
;
524 if (should_drop_frame(origskb
, present_fcs_len
, rtap_vendor_space
)) {
525 /* only need to expand headroom if necessary */
530 * This shouldn't trigger often because most devices have an
531 * RX header they pull before we get here, and that should
532 * be big enough for our radiotap information. We should
533 * probably export the length to drivers so that we can have
534 * them allocate enough headroom to start with.
536 if (skb_headroom(skb
) < needed_headroom
&&
537 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
543 * Need to make a copy and possibly remove radiotap header
544 * and FCS from the original.
546 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
548 origskb
= remove_monitor_info(local
, origskb
,
555 /* prepend radiotap information */
556 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, rt_hdrlen
, true);
558 skb_reset_mac_header(skb
);
559 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
560 skb
->pkt_type
= PACKET_OTHERHOST
;
561 skb
->protocol
= htons(ETH_P_802_2
);
563 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
564 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
567 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
570 if (!ieee80211_sdata_running(sdata
))
574 skb2
= skb_clone(skb
, GFP_ATOMIC
);
576 skb2
->dev
= prev_dev
;
577 netif_receive_skb(skb2
);
581 prev_dev
= sdata
->dev
;
582 ieee80211_rx_stats(sdata
->dev
, skb
->len
);
587 netif_receive_skb(skb
);
594 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
596 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
597 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
598 int tid
, seqno_idx
, security_idx
;
600 /* does the frame have a qos control field? */
601 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
602 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
603 /* frame has qos control */
604 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
605 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
606 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
614 * Sequence numbers for management frames, QoS data
615 * frames with a broadcast/multicast address in the
616 * Address 1 field, and all non-QoS data frames sent
617 * by QoS STAs are assigned using an additional single
618 * modulo-4096 counter, [...]
620 * We also use that counter for non-QoS STAs.
622 seqno_idx
= IEEE80211_NUM_TIDS
;
624 if (ieee80211_is_mgmt(hdr
->frame_control
))
625 security_idx
= IEEE80211_NUM_TIDS
;
629 rx
->seqno_idx
= seqno_idx
;
630 rx
->security_idx
= security_idx
;
631 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
632 * For now, set skb->priority to 0 for other cases. */
633 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
637 * DOC: Packet alignment
639 * Drivers always need to pass packets that are aligned to two-byte boundaries
642 * Additionally, should, if possible, align the payload data in a way that
643 * guarantees that the contained IP header is aligned to a four-byte
644 * boundary. In the case of regular frames, this simply means aligning the
645 * payload to a four-byte boundary (because either the IP header is directly
646 * contained, or IV/RFC1042 headers that have a length divisible by four are
647 * in front of it). If the payload data is not properly aligned and the
648 * architecture doesn't support efficient unaligned operations, mac80211
649 * will align the data.
651 * With A-MSDU frames, however, the payload data address must yield two modulo
652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
653 * push the IP header further back to a multiple of four again. Thankfully, the
654 * specs were sane enough this time around to require padding each A-MSDU
655 * subframe to a length that is a multiple of four.
657 * Padding like Atheros hardware adds which is between the 802.11 header and
658 * the payload is not supported, the driver is required to move the 802.11
659 * header to be directly in front of the payload in that case.
661 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
663 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
664 WARN_ON_ONCE((unsigned long)rx
->skb
->data
& 1);
671 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
673 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
675 if (is_multicast_ether_addr(hdr
->addr1
))
678 return ieee80211_is_robust_mgmt_frame(skb
);
682 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
684 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
686 if (!is_multicast_ether_addr(hdr
->addr1
))
689 return ieee80211_is_robust_mgmt_frame(skb
);
693 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
694 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
696 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
697 struct ieee80211_mmie
*mmie
;
698 struct ieee80211_mmie_16
*mmie16
;
700 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
703 if (!ieee80211_is_robust_mgmt_frame(skb
))
704 return -1; /* not a robust management frame */
706 mmie
= (struct ieee80211_mmie
*)
707 (skb
->data
+ skb
->len
- sizeof(*mmie
));
708 if (mmie
->element_id
== WLAN_EID_MMIE
&&
709 mmie
->length
== sizeof(*mmie
) - 2)
710 return le16_to_cpu(mmie
->key_id
);
712 mmie16
= (struct ieee80211_mmie_16
*)
713 (skb
->data
+ skb
->len
- sizeof(*mmie16
));
714 if (skb
->len
>= 24 + sizeof(*mmie16
) &&
715 mmie16
->element_id
== WLAN_EID_MMIE
&&
716 mmie16
->length
== sizeof(*mmie16
) - 2)
717 return le16_to_cpu(mmie16
->key_id
);
722 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
725 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
730 fc
= hdr
->frame_control
;
731 hdrlen
= ieee80211_hdrlen(fc
);
733 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
736 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
737 keyid
&= cs
->key_idx_mask
;
738 keyid
>>= cs
->key_idx_shift
;
743 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
745 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
746 char *dev_addr
= rx
->sdata
->vif
.addr
;
748 if (ieee80211_is_data(hdr
->frame_control
)) {
749 if (is_multicast_ether_addr(hdr
->addr1
)) {
750 if (ieee80211_has_tods(hdr
->frame_control
) ||
751 !ieee80211_has_fromds(hdr
->frame_control
))
752 return RX_DROP_MONITOR
;
753 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
754 return RX_DROP_MONITOR
;
756 if (!ieee80211_has_a4(hdr
->frame_control
))
757 return RX_DROP_MONITOR
;
758 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
759 return RX_DROP_MONITOR
;
763 /* If there is not an established peer link and this is not a peer link
764 * establisment frame, beacon or probe, drop the frame.
767 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
768 struct ieee80211_mgmt
*mgmt
;
770 if (!ieee80211_is_mgmt(hdr
->frame_control
))
771 return RX_DROP_MONITOR
;
773 if (ieee80211_is_action(hdr
->frame_control
)) {
776 /* make sure category field is present */
777 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
778 return RX_DROP_MONITOR
;
780 mgmt
= (struct ieee80211_mgmt
*)hdr
;
781 category
= mgmt
->u
.action
.category
;
782 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
783 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
784 return RX_DROP_MONITOR
;
788 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
789 ieee80211_is_probe_resp(hdr
->frame_control
) ||
790 ieee80211_is_beacon(hdr
->frame_control
) ||
791 ieee80211_is_auth(hdr
->frame_control
))
794 return RX_DROP_MONITOR
;
800 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
801 struct tid_ampdu_rx
*tid_agg_rx
,
803 struct sk_buff_head
*frames
)
805 struct sk_buff_head
*skb_list
= &tid_agg_rx
->reorder_buf
[index
];
807 struct ieee80211_rx_status
*status
;
809 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
811 if (skb_queue_empty(skb_list
))
814 if (!ieee80211_rx_reorder_ready(skb_list
)) {
815 __skb_queue_purge(skb_list
);
819 /* release frames from the reorder ring buffer */
820 tid_agg_rx
->stored_mpdu_num
--;
821 while ((skb
= __skb_dequeue(skb_list
))) {
822 status
= IEEE80211_SKB_RXCB(skb
);
823 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
824 __skb_queue_tail(frames
, skb
);
828 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
831 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
832 struct tid_ampdu_rx
*tid_agg_rx
,
834 struct sk_buff_head
*frames
)
838 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
840 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
841 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
842 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
848 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
849 * the skb was added to the buffer longer than this time ago, the earlier
850 * frames that have not yet been received are assumed to be lost and the skb
851 * can be released for processing. This may also release other skb's from the
852 * reorder buffer if there are no additional gaps between the frames.
854 * Callers must hold tid_agg_rx->reorder_lock.
856 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
858 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
859 struct tid_ampdu_rx
*tid_agg_rx
,
860 struct sk_buff_head
*frames
)
864 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
866 /* release the buffer until next missing frame */
867 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
868 if (!ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
]) &&
869 tid_agg_rx
->stored_mpdu_num
) {
871 * No buffers ready to be released, but check whether any
872 * frames in the reorder buffer have timed out.
875 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
876 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
877 if (!ieee80211_rx_reorder_ready(
878 &tid_agg_rx
->reorder_buf
[j
])) {
883 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
884 HT_RX_REORDER_BUF_TIMEOUT
))
885 goto set_release_timer
;
887 /* don't leave incomplete A-MSDUs around */
888 for (i
= (index
+ 1) % tid_agg_rx
->buf_size
; i
!= j
;
889 i
= (i
+ 1) % tid_agg_rx
->buf_size
)
890 __skb_queue_purge(&tid_agg_rx
->reorder_buf
[i
]);
892 ht_dbg_ratelimited(sdata
,
893 "release an RX reorder frame due to timeout on earlier frames\n");
894 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
898 * Increment the head seq# also for the skipped slots.
900 tid_agg_rx
->head_seq_num
=
901 (tid_agg_rx
->head_seq_num
+
902 skipped
) & IEEE80211_SN_MASK
;
905 } else while (ieee80211_rx_reorder_ready(
906 &tid_agg_rx
->reorder_buf
[index
])) {
907 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
909 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
912 if (tid_agg_rx
->stored_mpdu_num
) {
913 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
915 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
916 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
917 if (ieee80211_rx_reorder_ready(
918 &tid_agg_rx
->reorder_buf
[j
]))
924 if (!tid_agg_rx
->removed
)
925 mod_timer(&tid_agg_rx
->reorder_timer
,
926 tid_agg_rx
->reorder_time
[j
] + 1 +
927 HT_RX_REORDER_BUF_TIMEOUT
);
929 del_timer(&tid_agg_rx
->reorder_timer
);
934 * As this function belongs to the RX path it must be under
935 * rcu_read_lock protection. It returns false if the frame
936 * can be processed immediately, true if it was consumed.
938 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
939 struct tid_ampdu_rx
*tid_agg_rx
,
941 struct sk_buff_head
*frames
)
943 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
944 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
945 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
946 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
947 u16 head_seq_num
, buf_size
;
951 spin_lock(&tid_agg_rx
->reorder_lock
);
954 * Offloaded BA sessions have no known starting sequence number so pick
955 * one from first Rxed frame for this tid after BA was started.
957 if (unlikely(tid_agg_rx
->auto_seq
)) {
958 tid_agg_rx
->auto_seq
= false;
959 tid_agg_rx
->ssn
= mpdu_seq_num
;
960 tid_agg_rx
->head_seq_num
= mpdu_seq_num
;
963 buf_size
= tid_agg_rx
->buf_size
;
964 head_seq_num
= tid_agg_rx
->head_seq_num
;
966 /* frame with out of date sequence number */
967 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
973 * If frame the sequence number exceeds our buffering window
974 * size release some previous frames to make room for this one.
976 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
977 head_seq_num
= ieee80211_sn_inc(
978 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
979 /* release stored frames up to new head to stack */
980 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
981 head_seq_num
, frames
);
984 /* Now the new frame is always in the range of the reordering buffer */
986 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
988 /* check if we already stored this frame */
989 if (ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
])) {
995 * If the current MPDU is in the right order and nothing else
996 * is stored we can process it directly, no need to buffer it.
997 * If it is first but there's something stored, we may be able
998 * to release frames after this one.
1000 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
1001 tid_agg_rx
->stored_mpdu_num
== 0) {
1002 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
))
1003 tid_agg_rx
->head_seq_num
=
1004 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
1009 /* put the frame in the reordering buffer */
1010 __skb_queue_tail(&tid_agg_rx
->reorder_buf
[index
], skb
);
1011 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1012 tid_agg_rx
->reorder_time
[index
] = jiffies
;
1013 tid_agg_rx
->stored_mpdu_num
++;
1014 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
1018 spin_unlock(&tid_agg_rx
->reorder_lock
);
1023 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1024 * true if the MPDU was buffered, false if it should be processed.
1026 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
1027 struct sk_buff_head
*frames
)
1029 struct sk_buff
*skb
= rx
->skb
;
1030 struct ieee80211_local
*local
= rx
->local
;
1031 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1032 struct sta_info
*sta
= rx
->sta
;
1033 struct tid_ampdu_rx
*tid_agg_rx
;
1037 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
1038 is_multicast_ether_addr(hdr
->addr1
))
1042 * filter the QoS data rx stream according to
1043 * STA/TID and check if this STA/TID is on aggregation
1049 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
1050 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
1051 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1053 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
1057 /* qos null data frames are excluded */
1058 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
1061 /* not part of a BA session */
1062 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
1063 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
1066 /* new, potentially un-ordered, ampdu frame - process it */
1068 /* reset session timer */
1069 if (tid_agg_rx
->timeout
)
1070 tid_agg_rx
->last_rx
= jiffies
;
1072 /* if this mpdu is fragmented - terminate rx aggregation session */
1073 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1074 if (sc
& IEEE80211_SCTL_FRAG
) {
1075 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
1076 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
1077 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
1082 * No locking needed -- we will only ever process one
1083 * RX packet at a time, and thus own tid_agg_rx. All
1084 * other code manipulating it needs to (and does) make
1085 * sure that we cannot get to it any more before doing
1088 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
1093 __skb_queue_tail(frames
, skb
);
1096 static ieee80211_rx_result debug_noinline
1097 ieee80211_rx_h_check_dup(struct ieee80211_rx_data
*rx
)
1099 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1100 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1103 * Drop duplicate 802.11 retransmissions
1104 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1107 if (rx
->skb
->len
< 24)
1110 if (ieee80211_is_ctl(hdr
->frame_control
) ||
1111 ieee80211_is_qos_nullfunc(hdr
->frame_control
) ||
1112 is_multicast_ether_addr(hdr
->addr1
))
1118 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1119 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] == hdr
->seq_ctrl
)) {
1120 I802_DEBUG_INC(rx
->local
->dot11FrameDuplicateCount
);
1121 rx
->sta
->rx_stats
.num_duplicates
++;
1122 return RX_DROP_UNUSABLE
;
1123 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1124 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1130 static ieee80211_rx_result debug_noinline
1131 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
1133 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1135 /* Drop disallowed frame classes based on STA auth/assoc state;
1136 * IEEE 802.11, Chap 5.5.
1138 * mac80211 filters only based on association state, i.e. it drops
1139 * Class 3 frames from not associated stations. hostapd sends
1140 * deauth/disassoc frames when needed. In addition, hostapd is
1141 * responsible for filtering on both auth and assoc states.
1144 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1145 return ieee80211_rx_mesh_check(rx
);
1147 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1148 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1149 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1150 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1151 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
1152 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1154 * accept port control frames from the AP even when it's not
1155 * yet marked ASSOC to prevent a race where we don't set the
1156 * assoc bit quickly enough before it sends the first frame
1158 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1159 ieee80211_is_data_present(hdr
->frame_control
)) {
1160 unsigned int hdrlen
;
1163 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1165 if (rx
->skb
->len
< hdrlen
+ 8)
1166 return RX_DROP_MONITOR
;
1168 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1169 if (ethertype
== rx
->sdata
->control_port_protocol
)
1173 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1174 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1177 return RX_DROP_UNUSABLE
;
1179 return RX_DROP_MONITOR
;
1186 static ieee80211_rx_result debug_noinline
1187 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1189 struct ieee80211_local
*local
;
1190 struct ieee80211_hdr
*hdr
;
1191 struct sk_buff
*skb
;
1195 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1197 if (!local
->pspolling
)
1200 if (!ieee80211_has_fromds(hdr
->frame_control
))
1201 /* this is not from AP */
1204 if (!ieee80211_is_data(hdr
->frame_control
))
1207 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1208 /* AP has no more frames buffered for us */
1209 local
->pspolling
= false;
1213 /* more data bit is set, let's request a new frame from the AP */
1214 ieee80211_send_pspoll(local
, rx
->sdata
);
1219 static void sta_ps_start(struct sta_info
*sta
)
1221 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1222 struct ieee80211_local
*local
= sdata
->local
;
1226 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1227 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1228 ps
= &sdata
->bss
->ps
;
1232 atomic_inc(&ps
->num_sta_ps
);
1233 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1234 if (!ieee80211_hw_check(&local
->hw
, AP_LINK_PS
))
1235 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1236 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1237 sta
->sta
.addr
, sta
->sta
.aid
);
1239 ieee80211_clear_fast_xmit(sta
);
1241 if (!sta
->sta
.txq
[0])
1244 for (tid
= 0; tid
< ARRAY_SIZE(sta
->sta
.txq
); tid
++) {
1245 struct txq_info
*txqi
= to_txq_info(sta
->sta
.txq
[tid
]);
1247 if (!skb_queue_len(&txqi
->queue
))
1248 set_bit(tid
, &sta
->txq_buffered_tids
);
1250 clear_bit(tid
, &sta
->txq_buffered_tids
);
1254 static void sta_ps_end(struct sta_info
*sta
)
1256 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1257 sta
->sta
.addr
, sta
->sta
.aid
);
1259 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1261 * Clear the flag only if the other one is still set
1262 * so that the TX path won't start TX'ing new frames
1263 * directly ... In the case that the driver flag isn't
1264 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1266 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1267 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1268 sta
->sta
.addr
, sta
->sta
.aid
);
1272 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1273 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1274 ieee80211_sta_ps_deliver_wakeup(sta
);
1277 int ieee80211_sta_ps_transition(struct ieee80211_sta
*pubsta
, bool start
)
1279 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1282 WARN_ON(!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
));
1284 /* Don't let the same PS state be set twice */
1285 in_ps
= test_sta_flag(sta
, WLAN_STA_PS_STA
);
1286 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1296 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1298 static ieee80211_rx_result debug_noinline
1299 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1301 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1302 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1303 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1309 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1310 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1314 * The device handles station powersave, so don't do anything about
1315 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1316 * it to mac80211 since they're handled.)
1318 if (ieee80211_hw_check(&sdata
->local
->hw
, AP_LINK_PS
))
1322 * Don't do anything if the station isn't already asleep. In
1323 * the uAPSD case, the station will probably be marked asleep,
1324 * in the PS-Poll case the station must be confused ...
1326 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1329 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1330 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1331 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1332 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1334 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1337 /* Free PS Poll skb here instead of returning RX_DROP that would
1338 * count as an dropped frame. */
1339 dev_kfree_skb(rx
->skb
);
1342 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1343 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1344 ieee80211_has_pm(hdr
->frame_control
) &&
1345 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1346 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1347 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1348 ac
= ieee802_1d_to_ac
[tid
& 7];
1351 * If this AC is not trigger-enabled do nothing.
1353 * NB: This could/should check a separate bitmap of trigger-
1354 * enabled queues, but for now we only implement uAPSD w/o
1355 * TSPEC changes to the ACs, so they're always the same.
1357 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1360 /* if we are in a service period, do nothing */
1361 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1364 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1365 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1367 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1373 static ieee80211_rx_result debug_noinline
1374 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1376 struct sta_info
*sta
= rx
->sta
;
1377 struct sk_buff
*skb
= rx
->skb
;
1378 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1379 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1386 * Update last_rx only for IBSS packets which are for the current
1387 * BSSID and for station already AUTHORIZED to avoid keeping the
1388 * current IBSS network alive in cases where other STAs start
1389 * using different BSSID. This will also give the station another
1390 * chance to restart the authentication/authorization in case
1391 * something went wrong the first time.
1393 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1394 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1395 NL80211_IFTYPE_ADHOC
);
1396 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1397 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1398 sta
->rx_stats
.last_rx
= jiffies
;
1399 if (ieee80211_is_data(hdr
->frame_control
) &&
1400 !is_multicast_ether_addr(hdr
->addr1
)) {
1401 sta
->rx_stats
.last_rate_idx
=
1403 sta
->rx_stats
.last_rate_flag
=
1405 sta
->rx_stats
.last_rate_vht_flag
=
1407 sta
->rx_stats
.last_rate_vht_nss
=
1411 } else if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
) {
1412 sta
->rx_stats
.last_rx
= jiffies
;
1413 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1415 * Mesh beacons will update last_rx when if they are found to
1416 * match the current local configuration when processed.
1418 sta
->rx_stats
.last_rx
= jiffies
;
1419 if (ieee80211_is_data(hdr
->frame_control
)) {
1420 sta
->rx_stats
.last_rate_idx
= status
->rate_idx
;
1421 sta
->rx_stats
.last_rate_flag
= status
->flag
;
1422 sta
->rx_stats
.last_rate_vht_flag
= status
->vht_flag
;
1423 sta
->rx_stats
.last_rate_vht_nss
= status
->vht_nss
;
1427 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1428 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1430 sta
->rx_stats
.fragments
++;
1431 sta
->rx_stats
.bytes
+= rx
->skb
->len
;
1432 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1433 sta
->rx_stats
.last_signal
= status
->signal
;
1434 ewma_signal_add(&sta
->rx_stats
.avg_signal
, -status
->signal
);
1437 if (status
->chains
) {
1438 sta
->rx_stats
.chains
= status
->chains
;
1439 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1440 int signal
= status
->chain_signal
[i
];
1442 if (!(status
->chains
& BIT(i
)))
1445 sta
->rx_stats
.chain_signal_last
[i
] = signal
;
1446 ewma_signal_add(&sta
->rx_stats
.chain_signal_avg
[i
],
1452 * Change STA power saving mode only at the end of a frame
1453 * exchange sequence.
1455 if (!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
) &&
1456 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1457 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1458 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1459 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1460 /* PM bit is only checked in frames where it isn't reserved,
1461 * in AP mode it's reserved in non-bufferable management frames
1462 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1464 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1465 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1466 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1467 if (!ieee80211_has_pm(hdr
->frame_control
))
1470 if (ieee80211_has_pm(hdr
->frame_control
))
1475 /* mesh power save support */
1476 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1477 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1480 * Drop (qos-)data::nullfunc frames silently, since they
1481 * are used only to control station power saving mode.
1483 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1484 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1485 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1488 * If we receive a 4-addr nullfunc frame from a STA
1489 * that was not moved to a 4-addr STA vlan yet send
1490 * the event to userspace and for older hostapd drop
1491 * the frame to the monitor interface.
1493 if (ieee80211_has_a4(hdr
->frame_control
) &&
1494 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1495 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1496 !rx
->sdata
->u
.vlan
.sta
))) {
1497 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1498 cfg80211_rx_unexpected_4addr_frame(
1499 rx
->sdata
->dev
, sta
->sta
.addr
,
1501 return RX_DROP_MONITOR
;
1504 * Update counter and free packet here to avoid
1505 * counting this as a dropped packed.
1507 sta
->rx_stats
.packets
++;
1508 dev_kfree_skb(rx
->skb
);
1513 } /* ieee80211_rx_h_sta_process */
1515 static ieee80211_rx_result debug_noinline
1516 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1518 struct sk_buff
*skb
= rx
->skb
;
1519 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1520 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1523 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1524 struct ieee80211_key
*sta_ptk
= NULL
;
1525 int mmie_keyidx
= -1;
1527 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1532 * There are four types of keys:
1533 * - GTK (group keys)
1534 * - IGTK (group keys for management frames)
1535 * - PTK (pairwise keys)
1536 * - STK (station-to-station pairwise keys)
1538 * When selecting a key, we have to distinguish between multicast
1539 * (including broadcast) and unicast frames, the latter can only
1540 * use PTKs and STKs while the former always use GTKs and IGTKs.
1541 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1542 * unicast frames can also use key indices like GTKs. Hence, if we
1543 * don't have a PTK/STK we check the key index for a WEP key.
1545 * Note that in a regular BSS, multicast frames are sent by the
1546 * AP only, associated stations unicast the frame to the AP first
1547 * which then multicasts it on their behalf.
1549 * There is also a slight problem in IBSS mode: GTKs are negotiated
1550 * with each station, that is something we don't currently handle.
1551 * The spec seems to expect that one negotiates the same key with
1552 * every station but there's no such requirement; VLANs could be
1556 /* start without a key */
1558 fc
= hdr
->frame_control
;
1561 int keyid
= rx
->sta
->ptk_idx
;
1563 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1564 cs
= rx
->sta
->cipher_scheme
;
1565 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1566 if (unlikely(keyid
< 0))
1567 return RX_DROP_UNUSABLE
;
1569 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1572 if (!ieee80211_has_protected(fc
))
1573 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1575 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1577 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1578 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1580 /* Skip decryption if the frame is not protected. */
1581 if (!ieee80211_has_protected(fc
))
1583 } else if (mmie_keyidx
>= 0) {
1584 /* Broadcast/multicast robust management frame / BIP */
1585 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1586 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1589 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1590 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1591 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1593 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1595 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1596 } else if (!ieee80211_has_protected(fc
)) {
1598 * The frame was not protected, so skip decryption. However, we
1599 * need to set rx->key if there is a key that could have been
1600 * used so that the frame may be dropped if encryption would
1601 * have been expected.
1603 struct ieee80211_key
*key
= NULL
;
1604 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1607 if (ieee80211_is_mgmt(fc
) &&
1608 is_multicast_ether_addr(hdr
->addr1
) &&
1609 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1613 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1614 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1620 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1621 key
= rcu_dereference(sdata
->keys
[i
]);
1634 * The device doesn't give us the IV so we won't be
1635 * able to look up the key. That's ok though, we
1636 * don't need to decrypt the frame, we just won't
1637 * be able to keep statistics accurate.
1638 * Except for key threshold notifications, should
1639 * we somehow allow the driver to tell us which key
1640 * the hardware used if this flag is set?
1642 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1643 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1646 hdrlen
= ieee80211_hdrlen(fc
);
1649 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1651 if (unlikely(keyidx
< 0))
1652 return RX_DROP_UNUSABLE
;
1654 if (rx
->skb
->len
< 8 + hdrlen
)
1655 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1657 * no need to call ieee80211_wep_get_keyidx,
1658 * it verifies a bunch of things we've done already
1660 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1661 keyidx
= keyid
>> 6;
1664 /* check per-station GTK first, if multicast packet */
1665 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1666 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1668 /* if not found, try default key */
1670 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1673 * RSNA-protected unicast frames should always be
1674 * sent with pairwise or station-to-station keys,
1675 * but for WEP we allow using a key index as well.
1678 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1679 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1680 !is_multicast_ether_addr(hdr
->addr1
))
1686 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1687 return RX_DROP_MONITOR
;
1689 /* TODO: add threshold stuff again */
1691 return RX_DROP_MONITOR
;
1694 switch (rx
->key
->conf
.cipher
) {
1695 case WLAN_CIPHER_SUITE_WEP40
:
1696 case WLAN_CIPHER_SUITE_WEP104
:
1697 result
= ieee80211_crypto_wep_decrypt(rx
);
1699 case WLAN_CIPHER_SUITE_TKIP
:
1700 result
= ieee80211_crypto_tkip_decrypt(rx
);
1702 case WLAN_CIPHER_SUITE_CCMP
:
1703 result
= ieee80211_crypto_ccmp_decrypt(
1704 rx
, IEEE80211_CCMP_MIC_LEN
);
1706 case WLAN_CIPHER_SUITE_CCMP_256
:
1707 result
= ieee80211_crypto_ccmp_decrypt(
1708 rx
, IEEE80211_CCMP_256_MIC_LEN
);
1710 case WLAN_CIPHER_SUITE_AES_CMAC
:
1711 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1713 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1714 result
= ieee80211_crypto_aes_cmac_256_decrypt(rx
);
1716 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1717 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1718 result
= ieee80211_crypto_aes_gmac_decrypt(rx
);
1720 case WLAN_CIPHER_SUITE_GCMP
:
1721 case WLAN_CIPHER_SUITE_GCMP_256
:
1722 result
= ieee80211_crypto_gcmp_decrypt(rx
);
1725 result
= ieee80211_crypto_hw_decrypt(rx
);
1728 /* the hdr variable is invalid after the decrypt handlers */
1730 /* either the frame has been decrypted or will be dropped */
1731 status
->flag
|= RX_FLAG_DECRYPTED
;
1736 static inline struct ieee80211_fragment_entry
*
1737 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1738 unsigned int frag
, unsigned int seq
, int rx_queue
,
1739 struct sk_buff
**skb
)
1741 struct ieee80211_fragment_entry
*entry
;
1743 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1744 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1745 sdata
->fragment_next
= 0;
1747 if (!skb_queue_empty(&entry
->skb_list
))
1748 __skb_queue_purge(&entry
->skb_list
);
1750 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1752 entry
->first_frag_time
= jiffies
;
1754 entry
->rx_queue
= rx_queue
;
1755 entry
->last_frag
= frag
;
1756 entry
->check_sequential_pn
= false;
1757 entry
->extra_len
= 0;
1762 static inline struct ieee80211_fragment_entry
*
1763 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1764 unsigned int frag
, unsigned int seq
,
1765 int rx_queue
, struct ieee80211_hdr
*hdr
)
1767 struct ieee80211_fragment_entry
*entry
;
1770 idx
= sdata
->fragment_next
;
1771 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1772 struct ieee80211_hdr
*f_hdr
;
1776 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1778 entry
= &sdata
->fragments
[idx
];
1779 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1780 entry
->rx_queue
!= rx_queue
||
1781 entry
->last_frag
+ 1 != frag
)
1784 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1787 * Check ftype and addresses are equal, else check next fragment
1789 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1790 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1791 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1792 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1795 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1796 __skb_queue_purge(&entry
->skb_list
);
1805 static ieee80211_rx_result debug_noinline
1806 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1808 struct ieee80211_hdr
*hdr
;
1811 unsigned int frag
, seq
;
1812 struct ieee80211_fragment_entry
*entry
;
1813 struct sk_buff
*skb
;
1814 struct ieee80211_rx_status
*status
;
1816 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1817 fc
= hdr
->frame_control
;
1819 if (ieee80211_is_ctl(fc
))
1822 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1823 frag
= sc
& IEEE80211_SCTL_FRAG
;
1825 if (is_multicast_ether_addr(hdr
->addr1
)) {
1826 I802_DEBUG_INC(rx
->local
->dot11MulticastReceivedFrameCount
);
1830 if (likely(!ieee80211_has_morefrags(fc
) && frag
== 0))
1833 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1835 if (skb_linearize(rx
->skb
))
1836 return RX_DROP_UNUSABLE
;
1839 * skb_linearize() might change the skb->data and
1840 * previously cached variables (in this case, hdr) need to
1841 * be refreshed with the new data.
1843 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1844 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1847 /* This is the first fragment of a new frame. */
1848 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1849 rx
->seqno_idx
, &(rx
->skb
));
1851 (rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
||
1852 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP_256
||
1853 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_GCMP
||
1854 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_GCMP_256
) &&
1855 ieee80211_has_protected(fc
)) {
1856 int queue
= rx
->security_idx
;
1858 /* Store CCMP/GCMP PN so that we can verify that the
1859 * next fragment has a sequential PN value.
1861 entry
->check_sequential_pn
= true;
1862 memcpy(entry
->last_pn
,
1863 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1864 IEEE80211_CCMP_PN_LEN
);
1865 BUILD_BUG_ON(offsetof(struct ieee80211_key
,
1867 offsetof(struct ieee80211_key
,
1869 BUILD_BUG_ON(sizeof(rx
->key
->u
.ccmp
.rx_pn
[queue
]) !=
1870 sizeof(rx
->key
->u
.gcmp
.rx_pn
[queue
]));
1871 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN
!=
1872 IEEE80211_GCMP_PN_LEN
);
1877 /* This is a fragment for a frame that should already be pending in
1878 * fragment cache. Add this fragment to the end of the pending entry.
1880 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1881 rx
->seqno_idx
, hdr
);
1883 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1884 return RX_DROP_MONITOR
;
1887 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1888 * MPDU PN values are not incrementing in steps of 1."
1889 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1890 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1892 if (entry
->check_sequential_pn
) {
1894 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1898 (rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
&&
1899 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP_256
&&
1900 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_GCMP
&&
1901 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_GCMP_256
))
1902 return RX_DROP_UNUSABLE
;
1903 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1904 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1909 queue
= rx
->security_idx
;
1910 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1911 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1912 return RX_DROP_UNUSABLE
;
1913 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1916 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1917 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1918 entry
->last_frag
= frag
;
1919 entry
->extra_len
+= rx
->skb
->len
;
1920 if (ieee80211_has_morefrags(fc
)) {
1925 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1926 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1927 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head_defrag
);
1928 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1930 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1931 __skb_queue_purge(&entry
->skb_list
);
1932 return RX_DROP_UNUSABLE
;
1935 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1936 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1940 /* Complete frame has been reassembled - process it now */
1941 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1944 ieee80211_led_rx(rx
->local
);
1947 rx
->sta
->rx_stats
.packets
++;
1951 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1953 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1959 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1961 struct sk_buff
*skb
= rx
->skb
;
1962 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1965 * Pass through unencrypted frames if the hardware has
1966 * decrypted them already.
1968 if (status
->flag
& RX_FLAG_DECRYPTED
)
1971 /* Drop unencrypted frames if key is set. */
1972 if (unlikely(!ieee80211_has_protected(fc
) &&
1973 !ieee80211_is_nullfunc(fc
) &&
1974 ieee80211_is_data(fc
) && rx
->key
))
1980 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1982 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1983 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1984 __le16 fc
= hdr
->frame_control
;
1987 * Pass through unencrypted frames if the hardware has
1988 * decrypted them already.
1990 if (status
->flag
& RX_FLAG_DECRYPTED
)
1993 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1994 if (unlikely(!ieee80211_has_protected(fc
) &&
1995 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1997 if (ieee80211_is_deauth(fc
) ||
1998 ieee80211_is_disassoc(fc
))
1999 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
2004 /* BIP does not use Protected field, so need to check MMIE */
2005 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
2006 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
2007 if (ieee80211_is_deauth(fc
) ||
2008 ieee80211_is_disassoc(fc
))
2009 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
2015 * When using MFP, Action frames are not allowed prior to
2016 * having configured keys.
2018 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
2019 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
2027 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
2029 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2030 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2031 bool check_port_control
= false;
2032 struct ethhdr
*ehdr
;
2035 *port_control
= false;
2036 if (ieee80211_has_a4(hdr
->frame_control
) &&
2037 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
2040 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2041 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
2043 if (!sdata
->u
.mgd
.use_4addr
)
2046 check_port_control
= true;
2049 if (is_multicast_ether_addr(hdr
->addr1
) &&
2050 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
2053 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
2057 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2058 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
2059 *port_control
= true;
2060 else if (check_port_control
)
2067 * requires that rx->skb is a frame with ethernet header
2069 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
2071 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
2072 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2073 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2076 * Allow EAPOL frames to us/the PAE group address regardless
2077 * of whether the frame was encrypted or not.
2079 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
2080 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
2081 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
2084 if (ieee80211_802_1x_port_control(rx
) ||
2085 ieee80211_drop_unencrypted(rx
, fc
))
2092 * requires that rx->skb is a frame with ethernet header
2095 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
2097 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2098 struct net_device
*dev
= sdata
->dev
;
2099 struct sk_buff
*skb
, *xmit_skb
;
2100 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2101 struct sta_info
*dsta
;
2106 ieee80211_rx_stats(dev
, skb
->len
);
2108 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2109 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
2110 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
2111 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
2112 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
2114 * send multicast frames both to higher layers in
2115 * local net stack and back to the wireless medium
2117 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
2119 net_info_ratelimited("%s: failed to clone multicast frame\n",
2122 dsta
= sta_info_get(sdata
, skb
->data
);
2125 * The destination station is associated to
2126 * this AP (in this VLAN), so send the frame
2127 * directly to it and do not pass it to local
2136 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2138 /* 'align' will only take the values 0 or 2 here since all
2139 * frames are required to be aligned to 2-byte boundaries
2140 * when being passed to mac80211; the code here works just
2141 * as well if that isn't true, but mac80211 assumes it can
2142 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2146 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
2148 if (WARN_ON(skb_headroom(skb
) < 3)) {
2152 u8
*data
= skb
->data
;
2153 size_t len
= skb_headlen(skb
);
2155 memmove(skb
->data
, data
, len
);
2156 skb_set_tail_pointer(skb
, len
);
2163 /* deliver to local stack */
2164 skb
->protocol
= eth_type_trans(skb
, dev
);
2165 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2167 napi_gro_receive(rx
->napi
, skb
);
2169 netif_receive_skb(skb
);
2174 * Send to wireless media and increase priority by 256 to
2175 * keep the received priority instead of reclassifying
2176 * the frame (see cfg80211_classify8021d).
2178 xmit_skb
->priority
+= 256;
2179 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2180 skb_reset_network_header(xmit_skb
);
2181 skb_reset_mac_header(xmit_skb
);
2182 dev_queue_xmit(xmit_skb
);
2186 static ieee80211_rx_result debug_noinline
2187 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2189 struct net_device
*dev
= rx
->sdata
->dev
;
2190 struct sk_buff
*skb
= rx
->skb
;
2191 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2192 __le16 fc
= hdr
->frame_control
;
2193 struct sk_buff_head frame_list
;
2194 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2196 if (unlikely(!ieee80211_is_data(fc
)))
2199 if (unlikely(!ieee80211_is_data_present(fc
)))
2200 return RX_DROP_MONITOR
;
2202 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2205 if (ieee80211_has_a4(hdr
->frame_control
) &&
2206 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2207 !rx
->sdata
->u
.vlan
.sta
)
2208 return RX_DROP_UNUSABLE
;
2210 if (is_multicast_ether_addr(hdr
->addr1
) &&
2211 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2212 rx
->sdata
->u
.vlan
.sta
) ||
2213 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2214 rx
->sdata
->u
.mgd
.use_4addr
)))
2215 return RX_DROP_UNUSABLE
;
2218 __skb_queue_head_init(&frame_list
);
2220 if (skb_linearize(skb
))
2221 return RX_DROP_UNUSABLE
;
2223 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2224 rx
->sdata
->vif
.type
,
2225 rx
->local
->hw
.extra_tx_headroom
, true);
2227 while (!skb_queue_empty(&frame_list
)) {
2228 rx
->skb
= __skb_dequeue(&frame_list
);
2230 if (!ieee80211_frame_allowed(rx
, fc
)) {
2231 dev_kfree_skb(rx
->skb
);
2235 ieee80211_deliver_skb(rx
);
2241 #ifdef CONFIG_MAC80211_MESH
2242 static ieee80211_rx_result
2243 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2245 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2246 struct ieee80211_tx_info
*info
;
2247 struct ieee80211s_hdr
*mesh_hdr
;
2248 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2249 struct ieee80211_local
*local
= rx
->local
;
2250 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2251 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2254 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2255 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2257 /* make sure fixed part of mesh header is there, also checks skb len */
2258 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2259 return RX_DROP_MONITOR
;
2261 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2263 /* make sure full mesh header is there, also checks skb len */
2264 if (!pskb_may_pull(rx
->skb
,
2265 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2266 return RX_DROP_MONITOR
;
2268 /* reload pointers */
2269 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2270 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2272 if (ieee80211_drop_unencrypted(rx
, hdr
->frame_control
))
2273 return RX_DROP_MONITOR
;
2275 /* frame is in RMC, don't forward */
2276 if (ieee80211_is_data(hdr
->frame_control
) &&
2277 is_multicast_ether_addr(hdr
->addr1
) &&
2278 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2279 return RX_DROP_MONITOR
;
2281 if (!ieee80211_is_data(hdr
->frame_control
))
2285 return RX_DROP_MONITOR
;
2287 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2288 struct mesh_path
*mppath
;
2292 if (is_multicast_ether_addr(hdr
->addr1
)) {
2293 mpp_addr
= hdr
->addr3
;
2294 proxied_addr
= mesh_hdr
->eaddr1
;
2295 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2296 /* has_a4 already checked in ieee80211_rx_mesh_check */
2297 mpp_addr
= hdr
->addr4
;
2298 proxied_addr
= mesh_hdr
->eaddr2
;
2300 return RX_DROP_MONITOR
;
2304 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2306 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2308 spin_lock_bh(&mppath
->state_lock
);
2309 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2310 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2311 spin_unlock_bh(&mppath
->state_lock
);
2316 /* Frame has reached destination. Don't forward */
2317 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2318 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2321 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2322 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2323 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2324 return RX_DROP_MONITOR
;
2326 skb_set_queue_mapping(skb
, q
);
2328 if (!--mesh_hdr
->ttl
) {
2329 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2333 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2336 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2338 net_info_ratelimited("%s: failed to clone mesh frame\n",
2343 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2344 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2345 info
= IEEE80211_SKB_CB(fwd_skb
);
2346 memset(info
, 0, sizeof(*info
));
2347 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2348 info
->control
.vif
= &rx
->sdata
->vif
;
2349 info
->control
.jiffies
= jiffies
;
2350 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2351 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2352 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2353 /* update power mode indication when forwarding */
2354 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2355 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2356 /* mesh power mode flags updated in mesh_nexthop_lookup */
2357 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2359 /* unable to resolve next hop */
2360 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2362 WLAN_REASON_MESH_PATH_NOFORWARD
,
2364 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2366 return RX_DROP_MONITOR
;
2369 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2370 ieee80211_add_pending_skb(local
, fwd_skb
);
2372 if (is_multicast_ether_addr(hdr
->addr1
))
2374 return RX_DROP_MONITOR
;
2378 static ieee80211_rx_result debug_noinline
2379 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2381 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2382 struct ieee80211_local
*local
= rx
->local
;
2383 struct net_device
*dev
= sdata
->dev
;
2384 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2385 __le16 fc
= hdr
->frame_control
;
2389 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2392 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2393 return RX_DROP_MONITOR
;
2396 /* The seqno index has the same property as needed
2397 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2398 * for non-QoS-data frames. Here we know it's a data
2399 * frame, so count MSDUs.
2401 rx
->sta
->rx_stats
.msdu
[rx
->seqno_idx
]++;
2405 * Send unexpected-4addr-frame event to hostapd. For older versions,
2406 * also drop the frame to cooked monitor interfaces.
2408 if (ieee80211_has_a4(hdr
->frame_control
) &&
2409 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2411 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2412 cfg80211_rx_unexpected_4addr_frame(
2413 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2414 return RX_DROP_MONITOR
;
2417 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2419 return RX_DROP_UNUSABLE
;
2421 if (!ieee80211_frame_allowed(rx
, fc
))
2422 return RX_DROP_MONITOR
;
2424 /* directly handle TDLS channel switch requests/responses */
2425 if (unlikely(((struct ethhdr
*)rx
->skb
->data
)->h_proto
==
2426 cpu_to_be16(ETH_P_TDLS
))) {
2427 struct ieee80211_tdls_data
*tf
= (void *)rx
->skb
->data
;
2429 if (pskb_may_pull(rx
->skb
,
2430 offsetof(struct ieee80211_tdls_data
, u
)) &&
2431 tf
->payload_type
== WLAN_TDLS_SNAP_RFTYPE
&&
2432 tf
->category
== WLAN_CATEGORY_TDLS
&&
2433 (tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_REQUEST
||
2434 tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_RESPONSE
)) {
2435 skb_queue_tail(&local
->skb_queue_tdls_chsw
, rx
->skb
);
2436 schedule_work(&local
->tdls_chsw_work
);
2438 rx
->sta
->rx_stats
.packets
++;
2444 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2445 unlikely(port_control
) && sdata
->bss
) {
2446 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2454 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2455 !is_multicast_ether_addr(
2456 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2457 (!local
->scanning
&&
2458 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2459 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2460 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2463 ieee80211_deliver_skb(rx
);
2468 static ieee80211_rx_result debug_noinline
2469 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2471 struct sk_buff
*skb
= rx
->skb
;
2472 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2473 struct tid_ampdu_rx
*tid_agg_rx
;
2477 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2480 if (ieee80211_is_back_req(bar
->frame_control
)) {
2482 __le16 control
, start_seq_num
;
2483 } __packed bar_data
;
2484 struct ieee80211_event event
= {
2485 .type
= BAR_RX_EVENT
,
2489 return RX_DROP_MONITOR
;
2491 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2492 &bar_data
, sizeof(bar_data
)))
2493 return RX_DROP_MONITOR
;
2495 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2497 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2499 return RX_DROP_MONITOR
;
2501 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2502 event
.u
.ba
.tid
= tid
;
2503 event
.u
.ba
.ssn
= start_seq_num
;
2504 event
.u
.ba
.sta
= &rx
->sta
->sta
;
2506 /* reset session timer */
2507 if (tid_agg_rx
->timeout
)
2508 mod_timer(&tid_agg_rx
->session_timer
,
2509 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2511 spin_lock(&tid_agg_rx
->reorder_lock
);
2512 /* release stored frames up to start of BAR */
2513 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2514 start_seq_num
, frames
);
2515 spin_unlock(&tid_agg_rx
->reorder_lock
);
2517 drv_event_callback(rx
->local
, rx
->sdata
, &event
);
2524 * After this point, we only want management frames,
2525 * so we can drop all remaining control frames to
2526 * cooked monitor interfaces.
2528 return RX_DROP_MONITOR
;
2531 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2532 struct ieee80211_mgmt
*mgmt
,
2535 struct ieee80211_local
*local
= sdata
->local
;
2536 struct sk_buff
*skb
;
2537 struct ieee80211_mgmt
*resp
;
2539 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2540 /* Not to own unicast address */
2544 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2545 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2546 /* Not from the current AP or not associated yet. */
2550 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2551 /* Too short SA Query request frame */
2555 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2559 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2560 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2561 memset(resp
, 0, 24);
2562 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2563 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2564 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2565 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2566 IEEE80211_STYPE_ACTION
);
2567 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2568 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2569 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2570 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2571 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2572 WLAN_SA_QUERY_TR_ID_LEN
);
2574 ieee80211_tx_skb(sdata
, skb
);
2577 static ieee80211_rx_result debug_noinline
2578 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2580 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2581 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2584 * From here on, look only at management frames.
2585 * Data and control frames are already handled,
2586 * and unknown (reserved) frames are useless.
2588 if (rx
->skb
->len
< 24)
2589 return RX_DROP_MONITOR
;
2591 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2592 return RX_DROP_MONITOR
;
2594 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2595 ieee80211_is_beacon(mgmt
->frame_control
) &&
2596 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2599 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
2600 sig
= status
->signal
;
2602 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2603 rx
->skb
->data
, rx
->skb
->len
,
2605 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2608 if (ieee80211_drop_unencrypted_mgmt(rx
))
2609 return RX_DROP_UNUSABLE
;
2614 static ieee80211_rx_result debug_noinline
2615 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2617 struct ieee80211_local
*local
= rx
->local
;
2618 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2619 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2620 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2621 int len
= rx
->skb
->len
;
2623 if (!ieee80211_is_action(mgmt
->frame_control
))
2626 /* drop too small frames */
2627 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2628 return RX_DROP_UNUSABLE
;
2630 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2631 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2632 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2633 return RX_DROP_UNUSABLE
;
2635 switch (mgmt
->u
.action
.category
) {
2636 case WLAN_CATEGORY_HT
:
2637 /* reject HT action frames from stations not supporting HT */
2638 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2641 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2642 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2643 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2644 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2645 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2648 /* verify action & smps_control/chanwidth are present */
2649 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2652 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2653 case WLAN_HT_ACTION_SMPS
: {
2654 struct ieee80211_supported_band
*sband
;
2655 enum ieee80211_smps_mode smps_mode
;
2657 /* convert to HT capability */
2658 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2659 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2660 smps_mode
= IEEE80211_SMPS_OFF
;
2662 case WLAN_HT_SMPS_CONTROL_STATIC
:
2663 smps_mode
= IEEE80211_SMPS_STATIC
;
2665 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2666 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2672 /* if no change do nothing */
2673 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2675 rx
->sta
->sta
.smps_mode
= smps_mode
;
2677 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2679 rate_control_rate_update(local
, sband
, rx
->sta
,
2680 IEEE80211_RC_SMPS_CHANGED
);
2683 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2684 struct ieee80211_supported_band
*sband
;
2685 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2686 enum ieee80211_sta_rx_bandwidth max_bw
, new_bw
;
2688 /* If it doesn't support 40 MHz it can't change ... */
2689 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2690 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2693 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2694 max_bw
= IEEE80211_STA_RX_BW_20
;
2696 max_bw
= ieee80211_sta_cap_rx_bw(rx
->sta
);
2698 /* set cur_max_bandwidth and recalc sta bw */
2699 rx
->sta
->cur_max_bandwidth
= max_bw
;
2700 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2702 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2705 rx
->sta
->sta
.bandwidth
= new_bw
;
2706 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2708 rate_control_rate_update(local
, sband
, rx
->sta
,
2709 IEEE80211_RC_BW_CHANGED
);
2717 case WLAN_CATEGORY_PUBLIC
:
2718 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2720 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2724 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2726 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2727 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2729 if (len
< offsetof(struct ieee80211_mgmt
,
2730 u
.action
.u
.ext_chan_switch
.variable
))
2733 case WLAN_CATEGORY_VHT
:
2734 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2735 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2736 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2737 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2738 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2741 /* verify action code is present */
2742 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2745 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2746 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2749 /* verify opmode is present */
2750 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2753 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2755 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2756 opmode
, status
->band
);
2763 case WLAN_CATEGORY_BACK
:
2764 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2765 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2766 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2767 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2768 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2771 /* verify action_code is present */
2772 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2775 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2776 case WLAN_ACTION_ADDBA_REQ
:
2777 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2778 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2781 case WLAN_ACTION_ADDBA_RESP
:
2782 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2783 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2786 case WLAN_ACTION_DELBA
:
2787 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2788 sizeof(mgmt
->u
.action
.u
.delba
)))
2796 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2797 /* verify action_code is present */
2798 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2801 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2802 case WLAN_ACTION_SPCT_MSR_REQ
:
2803 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2806 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2807 sizeof(mgmt
->u
.action
.u
.measurement
)))
2810 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2813 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2815 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2817 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2818 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2821 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2822 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2823 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2826 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2827 bssid
= sdata
->u
.mgd
.bssid
;
2828 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2829 bssid
= sdata
->u
.ibss
.bssid
;
2830 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2835 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2842 case WLAN_CATEGORY_SA_QUERY
:
2843 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2844 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2847 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2848 case WLAN_ACTION_SA_QUERY_REQUEST
:
2849 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2851 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2855 case WLAN_CATEGORY_SELF_PROTECTED
:
2856 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2857 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2860 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2861 case WLAN_SP_MESH_PEERING_OPEN
:
2862 case WLAN_SP_MESH_PEERING_CLOSE
:
2863 case WLAN_SP_MESH_PEERING_CONFIRM
:
2864 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2866 if (sdata
->u
.mesh
.user_mpm
)
2867 /* userspace handles this frame */
2870 case WLAN_SP_MGK_INFORM
:
2871 case WLAN_SP_MGK_ACK
:
2872 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2877 case WLAN_CATEGORY_MESH_ACTION
:
2878 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2879 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2882 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2884 if (mesh_action_is_path_sel(mgmt
) &&
2885 !mesh_path_sel_is_hwmp(sdata
))
2893 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2894 /* will return in the next handlers */
2899 rx
->sta
->rx_stats
.packets
++;
2900 dev_kfree_skb(rx
->skb
);
2904 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2905 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2906 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2908 rx
->sta
->rx_stats
.packets
++;
2912 static ieee80211_rx_result debug_noinline
2913 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2915 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2918 /* skip known-bad action frames and return them in the next handler */
2919 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2923 * Getting here means the kernel doesn't know how to handle
2924 * it, but maybe userspace does ... include returned frames
2925 * so userspace can register for those to know whether ones
2926 * it transmitted were processed or returned.
2929 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
2930 sig
= status
->signal
;
2932 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2933 rx
->skb
->data
, rx
->skb
->len
, 0)) {
2935 rx
->sta
->rx_stats
.packets
++;
2936 dev_kfree_skb(rx
->skb
);
2943 static ieee80211_rx_result debug_noinline
2944 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2946 struct ieee80211_local
*local
= rx
->local
;
2947 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2948 struct sk_buff
*nskb
;
2949 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2950 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2952 if (!ieee80211_is_action(mgmt
->frame_control
))
2956 * For AP mode, hostapd is responsible for handling any action
2957 * frames that we didn't handle, including returning unknown
2958 * ones. For all other modes we will return them to the sender,
2959 * setting the 0x80 bit in the action category, as required by
2960 * 802.11-2012 9.24.4.
2961 * Newer versions of hostapd shall also use the management frame
2962 * registration mechanisms, but older ones still use cooked
2963 * monitor interfaces so push all frames there.
2965 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2966 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2967 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2968 return RX_DROP_MONITOR
;
2970 if (is_multicast_ether_addr(mgmt
->da
))
2971 return RX_DROP_MONITOR
;
2973 /* do not return rejected action frames */
2974 if (mgmt
->u
.action
.category
& 0x80)
2975 return RX_DROP_UNUSABLE
;
2977 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2980 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2982 nmgmt
->u
.action
.category
|= 0x80;
2983 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2984 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2986 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2988 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2989 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2991 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2992 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2993 IEEE80211_TX_CTL_NO_CCK_RATE
;
2994 if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
2996 local
->hw
.offchannel_tx_hw_queue
;
2999 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
3002 dev_kfree_skb(rx
->skb
);
3006 static ieee80211_rx_result debug_noinline
3007 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
3009 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3010 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
3013 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
3015 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
3016 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
3017 sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
3018 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
3019 return RX_DROP_MONITOR
;
3022 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
3023 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
3024 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
3025 /* process for all: mesh, mlme, ibss */
3027 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
3028 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
3029 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
3030 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
3031 if (is_multicast_ether_addr(mgmt
->da
) &&
3032 !is_broadcast_ether_addr(mgmt
->da
))
3033 return RX_DROP_MONITOR
;
3035 /* process only for station */
3036 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
3037 return RX_DROP_MONITOR
;
3039 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
3040 /* process only for ibss and mesh */
3041 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
3042 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
3043 return RX_DROP_MONITOR
;
3046 return RX_DROP_MONITOR
;
3049 /* queue up frame and kick off work to process it */
3050 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
3051 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
3052 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
3054 rx
->sta
->rx_stats
.packets
++;
3059 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
3060 struct ieee80211_rate
*rate
)
3062 struct ieee80211_sub_if_data
*sdata
;
3063 struct ieee80211_local
*local
= rx
->local
;
3064 struct sk_buff
*skb
= rx
->skb
, *skb2
;
3065 struct net_device
*prev_dev
= NULL
;
3066 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3067 int needed_headroom
;
3070 * If cooked monitor has been processed already, then
3071 * don't do it again. If not, set the flag.
3073 if (rx
->flags
& IEEE80211_RX_CMNTR
)
3075 rx
->flags
|= IEEE80211_RX_CMNTR
;
3077 /* If there are no cooked monitor interfaces, just free the SKB */
3078 if (!local
->cooked_mntrs
)
3081 /* vendor data is long removed here */
3082 status
->flag
&= ~RX_FLAG_RADIOTAP_VENDOR_DATA
;
3083 /* room for the radiotap header based on driver features */
3084 needed_headroom
= ieee80211_rx_radiotap_hdrlen(local
, status
, skb
);
3086 if (skb_headroom(skb
) < needed_headroom
&&
3087 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
3090 /* prepend radiotap information */
3091 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
3094 skb_set_mac_header(skb
, 0);
3095 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3096 skb
->pkt_type
= PACKET_OTHERHOST
;
3097 skb
->protocol
= htons(ETH_P_802_2
);
3099 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3100 if (!ieee80211_sdata_running(sdata
))
3103 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
3104 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
3108 skb2
= skb_clone(skb
, GFP_ATOMIC
);
3110 skb2
->dev
= prev_dev
;
3111 netif_receive_skb(skb2
);
3115 prev_dev
= sdata
->dev
;
3116 ieee80211_rx_stats(sdata
->dev
, skb
->len
);
3120 skb
->dev
= prev_dev
;
3121 netif_receive_skb(skb
);
3129 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
3130 ieee80211_rx_result res
)
3133 case RX_DROP_MONITOR
:
3134 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3136 rx
->sta
->rx_stats
.dropped
++;
3139 struct ieee80211_rate
*rate
= NULL
;
3140 struct ieee80211_supported_band
*sband
;
3141 struct ieee80211_rx_status
*status
;
3143 status
= IEEE80211_SKB_RXCB((rx
->skb
));
3145 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
3146 if (!(status
->flag
& RX_FLAG_HT
) &&
3147 !(status
->flag
& RX_FLAG_VHT
))
3148 rate
= &sband
->bitrates
[status
->rate_idx
];
3150 ieee80211_rx_cooked_monitor(rx
, rate
);
3153 case RX_DROP_UNUSABLE
:
3154 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3156 rx
->sta
->rx_stats
.dropped
++;
3157 dev_kfree_skb(rx
->skb
);
3160 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
3165 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
3166 struct sk_buff_head
*frames
)
3168 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3169 struct sk_buff
*skb
;
3171 #define CALL_RXH(rxh) \
3174 if (res != RX_CONTINUE) \
3178 /* Lock here to avoid hitting all of the data used in the RX
3179 * path (e.g. key data, station data, ...) concurrently when
3180 * a frame is released from the reorder buffer due to timeout
3181 * from the timer, potentially concurrently with RX from the
3184 spin_lock_bh(&rx
->local
->rx_path_lock
);
3186 while ((skb
= __skb_dequeue(frames
))) {
3188 * all the other fields are valid across frames
3189 * that belong to an aMPDU since they are on the
3190 * same TID from the same station
3194 CALL_RXH(ieee80211_rx_h_check_more_data
)
3195 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
3196 CALL_RXH(ieee80211_rx_h_sta_process
)
3197 CALL_RXH(ieee80211_rx_h_decrypt
)
3198 CALL_RXH(ieee80211_rx_h_defragment
)
3199 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
3200 /* must be after MMIC verify so header is counted in MPDU mic */
3201 #ifdef CONFIG_MAC80211_MESH
3202 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3203 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3205 CALL_RXH(ieee80211_rx_h_amsdu
)
3206 CALL_RXH(ieee80211_rx_h_data
)
3208 /* special treatment -- needs the queue */
3209 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3210 if (res
!= RX_CONTINUE
)
3213 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3214 CALL_RXH(ieee80211_rx_h_action
)
3215 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3216 CALL_RXH(ieee80211_rx_h_action_return
)
3217 CALL_RXH(ieee80211_rx_h_mgmt
)
3220 ieee80211_rx_handlers_result(rx
, res
);
3225 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3228 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3230 struct sk_buff_head reorder_release
;
3231 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3233 __skb_queue_head_init(&reorder_release
);
3235 #define CALL_RXH(rxh) \
3238 if (res != RX_CONTINUE) \
3242 CALL_RXH(ieee80211_rx_h_check_dup
)
3243 CALL_RXH(ieee80211_rx_h_check
)
3245 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3247 ieee80211_rx_handlers(rx
, &reorder_release
);
3251 ieee80211_rx_handlers_result(rx
, res
);
3257 * This function makes calls into the RX path, therefore
3258 * it has to be invoked under RCU read lock.
3260 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3262 struct sk_buff_head frames
;
3263 struct ieee80211_rx_data rx
= {
3265 .sdata
= sta
->sdata
,
3266 .local
= sta
->local
,
3267 /* This is OK -- must be QoS data frame */
3268 .security_idx
= tid
,
3270 .napi
= NULL
, /* must be NULL to not have races */
3272 struct tid_ampdu_rx
*tid_agg_rx
;
3274 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3278 __skb_queue_head_init(&frames
);
3280 spin_lock(&tid_agg_rx
->reorder_lock
);
3281 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3282 spin_unlock(&tid_agg_rx
->reorder_lock
);
3284 if (!skb_queue_empty(&frames
)) {
3285 struct ieee80211_event event
= {
3286 .type
= BA_FRAME_TIMEOUT
,
3288 .u
.ba
.sta
= &sta
->sta
,
3290 drv_event_callback(rx
.local
, rx
.sdata
, &event
);
3293 ieee80211_rx_handlers(&rx
, &frames
);
3296 /* main receive path */
3298 static bool ieee80211_accept_frame(struct ieee80211_rx_data
*rx
)
3300 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3301 struct sk_buff
*skb
= rx
->skb
;
3302 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3303 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3304 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3305 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3307 switch (sdata
->vif
.type
) {
3308 case NL80211_IFTYPE_STATION
:
3309 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3313 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3314 case NL80211_IFTYPE_ADHOC
:
3317 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3318 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3320 if (ieee80211_is_beacon(hdr
->frame_control
))
3322 if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
))
3325 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3329 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3330 rate_idx
= 0; /* TODO: HT/VHT rates */
3332 rate_idx
= status
->rate_idx
;
3333 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3337 case NL80211_IFTYPE_OCB
:
3340 if (!ieee80211_is_data_present(hdr
->frame_control
))
3342 if (!is_broadcast_ether_addr(bssid
))
3345 !ether_addr_equal(sdata
->dev
->dev_addr
, hdr
->addr1
))
3349 if (status
->flag
& RX_FLAG_HT
)
3350 rate_idx
= 0; /* TODO: HT rates */
3352 rate_idx
= status
->rate_idx
;
3353 ieee80211_ocb_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3357 case NL80211_IFTYPE_MESH_POINT
:
3360 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3361 case NL80211_IFTYPE_AP_VLAN
:
3362 case NL80211_IFTYPE_AP
:
3364 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3366 if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3368 * Accept public action frames even when the
3369 * BSSID doesn't match, this is used for P2P
3370 * and location updates. Note that mac80211
3371 * itself never looks at these frames.
3374 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3376 if (ieee80211_is_public_action(hdr
, skb
->len
))
3378 return ieee80211_is_beacon(hdr
->frame_control
);
3381 if (!ieee80211_has_tods(hdr
->frame_control
)) {
3382 /* ignore data frames to TDLS-peers */
3383 if (ieee80211_is_data(hdr
->frame_control
))
3385 /* ignore action frames to TDLS-peers */
3386 if (ieee80211_is_action(hdr
->frame_control
) &&
3387 !is_broadcast_ether_addr(bssid
) &&
3388 !ether_addr_equal(bssid
, hdr
->addr1
))
3392 case NL80211_IFTYPE_WDS
:
3393 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3395 return ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
);
3396 case NL80211_IFTYPE_P2P_DEVICE
:
3397 return ieee80211_is_public_action(hdr
, skb
->len
) ||
3398 ieee80211_is_probe_req(hdr
->frame_control
) ||
3399 ieee80211_is_probe_resp(hdr
->frame_control
) ||
3400 ieee80211_is_beacon(hdr
->frame_control
);
3410 * This function returns whether or not the SKB
3411 * was destined for RX processing or not, which,
3412 * if consume is true, is equivalent to whether
3413 * or not the skb was consumed.
3415 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3416 struct sk_buff
*skb
, bool consume
)
3418 struct ieee80211_local
*local
= rx
->local
;
3419 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3423 if (!ieee80211_accept_frame(rx
))
3427 skb
= skb_copy(skb
, GFP_ATOMIC
);
3429 if (net_ratelimit())
3430 wiphy_debug(local
->hw
.wiphy
,
3431 "failed to copy skb for %s\n",
3439 ieee80211_invoke_rx_handlers(rx
);
3444 * This is the actual Rx frames handler. as it belongs to Rx path it must
3445 * be called with rcu_read_lock protection.
3447 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3448 struct sk_buff
*skb
,
3449 struct napi_struct
*napi
)
3451 struct ieee80211_local
*local
= hw_to_local(hw
);
3452 struct ieee80211_sub_if_data
*sdata
;
3453 struct ieee80211_hdr
*hdr
;
3455 struct ieee80211_rx_data rx
;
3456 struct ieee80211_sub_if_data
*prev
;
3457 struct sta_info
*sta
, *prev_sta
;
3458 struct rhash_head
*tmp
;
3461 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3462 memset(&rx
, 0, sizeof(rx
));
3467 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3468 I802_DEBUG_INC(local
->dot11ReceivedFragmentCount
);
3470 if (ieee80211_is_mgmt(fc
)) {
3471 /* drop frame if too short for header */
3472 if (skb
->len
< ieee80211_hdrlen(fc
))
3475 err
= skb_linearize(skb
);
3477 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3485 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3486 ieee80211_parse_qos(&rx
);
3487 ieee80211_verify_alignment(&rx
);
3489 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3490 ieee80211_is_beacon(hdr
->frame_control
)))
3491 ieee80211_scan_rx(local
, skb
);
3493 if (ieee80211_is_data(fc
)) {
3494 const struct bucket_table
*tbl
;
3498 tbl
= rht_dereference_rcu(local
->sta_hash
.tbl
, &local
->sta_hash
);
3500 for_each_sta_info(local
, tbl
, hdr
->addr2
, sta
, tmp
) {
3507 rx
.sdata
= prev_sta
->sdata
;
3508 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3515 rx
.sdata
= prev_sta
->sdata
;
3517 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3525 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3526 if (!ieee80211_sdata_running(sdata
))
3529 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3530 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3534 * frame is destined for this interface, but if it's
3535 * not also for the previous one we handle that after
3536 * the loop to avoid copying the SKB once too much
3544 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3546 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3552 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3555 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3564 * This is the receive path handler. It is called by a low level driver when an
3565 * 802.11 MPDU is received from the hardware.
3567 void ieee80211_rx_napi(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
3568 struct napi_struct
*napi
)
3570 struct ieee80211_local
*local
= hw_to_local(hw
);
3571 struct ieee80211_rate
*rate
= NULL
;
3572 struct ieee80211_supported_band
*sband
;
3573 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3575 WARN_ON_ONCE(softirq_count() == 0);
3577 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3580 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3581 if (WARN_ON(!sband
))
3585 * If we're suspending, it is possible although not too likely
3586 * that we'd be receiving frames after having already partially
3587 * quiesced the stack. We can't process such frames then since
3588 * that might, for example, cause stations to be added or other
3589 * driver callbacks be invoked.
3591 if (unlikely(local
->quiescing
|| local
->suspended
))
3594 /* We might be during a HW reconfig, prevent Rx for the same reason */
3595 if (unlikely(local
->in_reconfig
))
3599 * The same happens when we're not even started,
3600 * but that's worth a warning.
3602 if (WARN_ON(!local
->started
))
3605 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3607 * Validate the rate, unless a PLCP error means that
3608 * we probably can't have a valid rate here anyway.
3611 if (status
->flag
& RX_FLAG_HT
) {
3613 * rate_idx is MCS index, which can be [0-76]
3616 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3618 * Anything else would be some sort of driver or
3619 * hardware error. The driver should catch hardware
3622 if (WARN(status
->rate_idx
> 76,
3623 "Rate marked as an HT rate but passed "
3624 "status->rate_idx is not "
3625 "an MCS index [0-76]: %d (0x%02x)\n",
3629 } else if (status
->flag
& RX_FLAG_VHT
) {
3630 if (WARN_ONCE(status
->rate_idx
> 9 ||
3632 status
->vht_nss
> 8,
3633 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3634 status
->rate_idx
, status
->vht_nss
))
3637 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3639 rate
= &sband
->bitrates
[status
->rate_idx
];
3643 status
->rx_flags
= 0;
3646 * key references and virtual interfaces are protected using RCU
3647 * and this requires that we are in a read-side RCU section during
3648 * receive processing
3653 * Frames with failed FCS/PLCP checksum are not returned,
3654 * all other frames are returned without radiotap header
3655 * if it was previously present.
3656 * Also, frames with less than 16 bytes are dropped.
3658 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3664 ieee80211_tpt_led_trig_rx(local
,
3665 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3667 __ieee80211_rx_handle_packet(hw
, skb
, napi
);
3675 EXPORT_SYMBOL(ieee80211_rx_napi
);
3677 /* This is a version of the rx handler that can be called from hard irq
3678 * context. Post the skb on the queue and schedule the tasklet */
3679 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3681 struct ieee80211_local
*local
= hw_to_local(hw
);
3683 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3685 skb
->pkt_type
= IEEE80211_RX_MSG
;
3686 skb_queue_tail(&local
->skb_queue
, skb
);
3687 tasklet_schedule(&local
->tasklet
);
3689 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);