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_ONCE((unsigned long)rx
->skb
->data
& 1,
665 "unaligned packet at 0x%p\n", rx
->skb
->data
);
672 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
674 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
676 if (is_multicast_ether_addr(hdr
->addr1
))
679 return ieee80211_is_robust_mgmt_frame(skb
);
683 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
685 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
687 if (!is_multicast_ether_addr(hdr
->addr1
))
690 return ieee80211_is_robust_mgmt_frame(skb
);
694 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
695 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
697 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
698 struct ieee80211_mmie
*mmie
;
699 struct ieee80211_mmie_16
*mmie16
;
701 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
704 if (!ieee80211_is_robust_mgmt_frame(skb
))
705 return -1; /* not a robust management frame */
707 mmie
= (struct ieee80211_mmie
*)
708 (skb
->data
+ skb
->len
- sizeof(*mmie
));
709 if (mmie
->element_id
== WLAN_EID_MMIE
&&
710 mmie
->length
== sizeof(*mmie
) - 2)
711 return le16_to_cpu(mmie
->key_id
);
713 mmie16
= (struct ieee80211_mmie_16
*)
714 (skb
->data
+ skb
->len
- sizeof(*mmie16
));
715 if (skb
->len
>= 24 + sizeof(*mmie16
) &&
716 mmie16
->element_id
== WLAN_EID_MMIE
&&
717 mmie16
->length
== sizeof(*mmie16
) - 2)
718 return le16_to_cpu(mmie16
->key_id
);
723 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
726 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
731 fc
= hdr
->frame_control
;
732 hdrlen
= ieee80211_hdrlen(fc
);
734 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
737 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
738 keyid
&= cs
->key_idx_mask
;
739 keyid
>>= cs
->key_idx_shift
;
744 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
746 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
747 char *dev_addr
= rx
->sdata
->vif
.addr
;
749 if (ieee80211_is_data(hdr
->frame_control
)) {
750 if (is_multicast_ether_addr(hdr
->addr1
)) {
751 if (ieee80211_has_tods(hdr
->frame_control
) ||
752 !ieee80211_has_fromds(hdr
->frame_control
))
753 return RX_DROP_MONITOR
;
754 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
755 return RX_DROP_MONITOR
;
757 if (!ieee80211_has_a4(hdr
->frame_control
))
758 return RX_DROP_MONITOR
;
759 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
760 return RX_DROP_MONITOR
;
764 /* If there is not an established peer link and this is not a peer link
765 * establisment frame, beacon or probe, drop the frame.
768 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
769 struct ieee80211_mgmt
*mgmt
;
771 if (!ieee80211_is_mgmt(hdr
->frame_control
))
772 return RX_DROP_MONITOR
;
774 if (ieee80211_is_action(hdr
->frame_control
)) {
777 /* make sure category field is present */
778 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
779 return RX_DROP_MONITOR
;
781 mgmt
= (struct ieee80211_mgmt
*)hdr
;
782 category
= mgmt
->u
.action
.category
;
783 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
784 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
785 return RX_DROP_MONITOR
;
789 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
790 ieee80211_is_probe_resp(hdr
->frame_control
) ||
791 ieee80211_is_beacon(hdr
->frame_control
) ||
792 ieee80211_is_auth(hdr
->frame_control
))
795 return RX_DROP_MONITOR
;
801 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
802 struct tid_ampdu_rx
*tid_agg_rx
,
804 struct sk_buff_head
*frames
)
806 struct sk_buff_head
*skb_list
= &tid_agg_rx
->reorder_buf
[index
];
808 struct ieee80211_rx_status
*status
;
810 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
812 if (skb_queue_empty(skb_list
))
815 if (!ieee80211_rx_reorder_ready(skb_list
)) {
816 __skb_queue_purge(skb_list
);
820 /* release frames from the reorder ring buffer */
821 tid_agg_rx
->stored_mpdu_num
--;
822 while ((skb
= __skb_dequeue(skb_list
))) {
823 status
= IEEE80211_SKB_RXCB(skb
);
824 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
825 __skb_queue_tail(frames
, skb
);
829 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
832 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
833 struct tid_ampdu_rx
*tid_agg_rx
,
835 struct sk_buff_head
*frames
)
839 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
841 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
842 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
843 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
849 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
850 * the skb was added to the buffer longer than this time ago, the earlier
851 * frames that have not yet been received are assumed to be lost and the skb
852 * can be released for processing. This may also release other skb's from the
853 * reorder buffer if there are no additional gaps between the frames.
855 * Callers must hold tid_agg_rx->reorder_lock.
857 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
859 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
860 struct tid_ampdu_rx
*tid_agg_rx
,
861 struct sk_buff_head
*frames
)
865 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
867 /* release the buffer until next missing frame */
868 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
869 if (!ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
]) &&
870 tid_agg_rx
->stored_mpdu_num
) {
872 * No buffers ready to be released, but check whether any
873 * frames in the reorder buffer have timed out.
876 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
877 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
878 if (!ieee80211_rx_reorder_ready(
879 &tid_agg_rx
->reorder_buf
[j
])) {
884 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
885 HT_RX_REORDER_BUF_TIMEOUT
))
886 goto set_release_timer
;
888 /* don't leave incomplete A-MSDUs around */
889 for (i
= (index
+ 1) % tid_agg_rx
->buf_size
; i
!= j
;
890 i
= (i
+ 1) % tid_agg_rx
->buf_size
)
891 __skb_queue_purge(&tid_agg_rx
->reorder_buf
[i
]);
893 ht_dbg_ratelimited(sdata
,
894 "release an RX reorder frame due to timeout on earlier frames\n");
895 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
899 * Increment the head seq# also for the skipped slots.
901 tid_agg_rx
->head_seq_num
=
902 (tid_agg_rx
->head_seq_num
+
903 skipped
) & IEEE80211_SN_MASK
;
906 } else while (ieee80211_rx_reorder_ready(
907 &tid_agg_rx
->reorder_buf
[index
])) {
908 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
910 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
913 if (tid_agg_rx
->stored_mpdu_num
) {
914 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
916 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
917 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
918 if (ieee80211_rx_reorder_ready(
919 &tid_agg_rx
->reorder_buf
[j
]))
925 if (!tid_agg_rx
->removed
)
926 mod_timer(&tid_agg_rx
->reorder_timer
,
927 tid_agg_rx
->reorder_time
[j
] + 1 +
928 HT_RX_REORDER_BUF_TIMEOUT
);
930 del_timer(&tid_agg_rx
->reorder_timer
);
935 * As this function belongs to the RX path it must be under
936 * rcu_read_lock protection. It returns false if the frame
937 * can be processed immediately, true if it was consumed.
939 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
940 struct tid_ampdu_rx
*tid_agg_rx
,
942 struct sk_buff_head
*frames
)
944 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
945 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
946 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
947 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
948 u16 head_seq_num
, buf_size
;
952 spin_lock(&tid_agg_rx
->reorder_lock
);
955 * Offloaded BA sessions have no known starting sequence number so pick
956 * one from first Rxed frame for this tid after BA was started.
958 if (unlikely(tid_agg_rx
->auto_seq
)) {
959 tid_agg_rx
->auto_seq
= false;
960 tid_agg_rx
->ssn
= mpdu_seq_num
;
961 tid_agg_rx
->head_seq_num
= mpdu_seq_num
;
964 buf_size
= tid_agg_rx
->buf_size
;
965 head_seq_num
= tid_agg_rx
->head_seq_num
;
967 /* frame with out of date sequence number */
968 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
974 * If frame the sequence number exceeds our buffering window
975 * size release some previous frames to make room for this one.
977 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
978 head_seq_num
= ieee80211_sn_inc(
979 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
980 /* release stored frames up to new head to stack */
981 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
982 head_seq_num
, frames
);
985 /* Now the new frame is always in the range of the reordering buffer */
987 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
989 /* check if we already stored this frame */
990 if (ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
])) {
996 * If the current MPDU is in the right order and nothing else
997 * is stored we can process it directly, no need to buffer it.
998 * If it is first but there's something stored, we may be able
999 * to release frames after this one.
1001 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
1002 tid_agg_rx
->stored_mpdu_num
== 0) {
1003 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
))
1004 tid_agg_rx
->head_seq_num
=
1005 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
1010 /* put the frame in the reordering buffer */
1011 __skb_queue_tail(&tid_agg_rx
->reorder_buf
[index
], skb
);
1012 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1013 tid_agg_rx
->reorder_time
[index
] = jiffies
;
1014 tid_agg_rx
->stored_mpdu_num
++;
1015 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
1019 spin_unlock(&tid_agg_rx
->reorder_lock
);
1024 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1025 * true if the MPDU was buffered, false if it should be processed.
1027 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
1028 struct sk_buff_head
*frames
)
1030 struct sk_buff
*skb
= rx
->skb
;
1031 struct ieee80211_local
*local
= rx
->local
;
1032 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1033 struct sta_info
*sta
= rx
->sta
;
1034 struct tid_ampdu_rx
*tid_agg_rx
;
1038 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
1039 is_multicast_ether_addr(hdr
->addr1
))
1043 * filter the QoS data rx stream according to
1044 * STA/TID and check if this STA/TID is on aggregation
1050 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
1051 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
1052 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1054 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
1058 /* qos null data frames are excluded */
1059 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
1062 /* not part of a BA session */
1063 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
1064 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
1067 /* new, potentially un-ordered, ampdu frame - process it */
1069 /* reset session timer */
1070 if (tid_agg_rx
->timeout
)
1071 tid_agg_rx
->last_rx
= jiffies
;
1073 /* if this mpdu is fragmented - terminate rx aggregation session */
1074 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1075 if (sc
& IEEE80211_SCTL_FRAG
) {
1076 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
1077 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
1078 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
1083 * No locking needed -- we will only ever process one
1084 * RX packet at a time, and thus own tid_agg_rx. All
1085 * other code manipulating it needs to (and does) make
1086 * sure that we cannot get to it any more before doing
1089 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
1094 __skb_queue_tail(frames
, skb
);
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_dup(struct ieee80211_rx_data
*rx
)
1100 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1101 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1104 * Drop duplicate 802.11 retransmissions
1105 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1108 if (rx
->skb
->len
< 24)
1111 if (ieee80211_is_ctl(hdr
->frame_control
) ||
1112 ieee80211_is_qos_nullfunc(hdr
->frame_control
) ||
1113 is_multicast_ether_addr(hdr
->addr1
))
1117 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1118 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
1120 I802_DEBUG_INC(rx
->local
->dot11FrameDuplicateCount
);
1121 rx
->sta
->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
;
1131 static ieee80211_rx_result debug_noinline
1132 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
1134 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1136 /* Drop disallowed frame classes based on STA auth/assoc state;
1137 * IEEE 802.11, Chap 5.5.
1139 * mac80211 filters only based on association state, i.e. it drops
1140 * Class 3 frames from not associated stations. hostapd sends
1141 * deauth/disassoc frames when needed. In addition, hostapd is
1142 * responsible for filtering on both auth and assoc states.
1145 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1146 return ieee80211_rx_mesh_check(rx
);
1148 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1149 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1150 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1151 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1152 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
1153 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1155 * accept port control frames from the AP even when it's not
1156 * yet marked ASSOC to prevent a race where we don't set the
1157 * assoc bit quickly enough before it sends the first frame
1159 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1160 ieee80211_is_data_present(hdr
->frame_control
)) {
1161 unsigned int hdrlen
;
1164 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1166 if (rx
->skb
->len
< hdrlen
+ 8)
1167 return RX_DROP_MONITOR
;
1169 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1170 if (ethertype
== rx
->sdata
->control_port_protocol
)
1174 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1175 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1178 return RX_DROP_UNUSABLE
;
1180 return RX_DROP_MONITOR
;
1187 static ieee80211_rx_result debug_noinline
1188 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1190 struct ieee80211_local
*local
;
1191 struct ieee80211_hdr
*hdr
;
1192 struct sk_buff
*skb
;
1196 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1198 if (!local
->pspolling
)
1201 if (!ieee80211_has_fromds(hdr
->frame_control
))
1202 /* this is not from AP */
1205 if (!ieee80211_is_data(hdr
->frame_control
))
1208 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1209 /* AP has no more frames buffered for us */
1210 local
->pspolling
= false;
1214 /* more data bit is set, let's request a new frame from the AP */
1215 ieee80211_send_pspoll(local
, rx
->sdata
);
1220 static void sta_ps_start(struct sta_info
*sta
)
1222 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1223 struct ieee80211_local
*local
= sdata
->local
;
1227 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1228 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1229 ps
= &sdata
->bss
->ps
;
1233 atomic_inc(&ps
->num_sta_ps
);
1234 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1235 if (!ieee80211_hw_check(&local
->hw
, AP_LINK_PS
))
1236 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1237 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1238 sta
->sta
.addr
, sta
->sta
.aid
);
1240 ieee80211_clear_fast_xmit(sta
);
1242 if (!sta
->sta
.txq
[0])
1245 for (tid
= 0; tid
< ARRAY_SIZE(sta
->sta
.txq
); tid
++) {
1246 struct txq_info
*txqi
= to_txq_info(sta
->sta
.txq
[tid
]);
1248 if (!skb_queue_len(&txqi
->queue
))
1249 set_bit(tid
, &sta
->txq_buffered_tids
);
1251 clear_bit(tid
, &sta
->txq_buffered_tids
);
1255 static void sta_ps_end(struct sta_info
*sta
)
1257 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1258 sta
->sta
.addr
, sta
->sta
.aid
);
1260 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1262 * Clear the flag only if the other one is still set
1263 * so that the TX path won't start TX'ing new frames
1264 * directly ... In the case that the driver flag isn't
1265 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1267 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1268 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1269 sta
->sta
.addr
, sta
->sta
.aid
);
1273 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1274 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1275 ieee80211_sta_ps_deliver_wakeup(sta
);
1278 int ieee80211_sta_ps_transition(struct ieee80211_sta
*pubsta
, bool start
)
1280 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1283 WARN_ON(!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
));
1285 /* Don't let the same PS state be set twice */
1286 in_ps
= test_sta_flag(sta
, WLAN_STA_PS_STA
);
1287 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1297 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1299 static ieee80211_rx_result debug_noinline
1300 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1302 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1303 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1304 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1310 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1311 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1315 * The device handles station powersave, so don't do anything about
1316 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1317 * it to mac80211 since they're handled.)
1319 if (ieee80211_hw_check(&sdata
->local
->hw
, AP_LINK_PS
))
1323 * Don't do anything if the station isn't already asleep. In
1324 * the uAPSD case, the station will probably be marked asleep,
1325 * in the PS-Poll case the station must be confused ...
1327 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1330 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1331 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1332 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1333 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1335 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1338 /* Free PS Poll skb here instead of returning RX_DROP that would
1339 * count as an dropped frame. */
1340 dev_kfree_skb(rx
->skb
);
1343 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1344 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1345 ieee80211_has_pm(hdr
->frame_control
) &&
1346 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1347 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1348 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1349 ac
= ieee802_1d_to_ac
[tid
& 7];
1352 * If this AC is not trigger-enabled do nothing.
1354 * NB: This could/should check a separate bitmap of trigger-
1355 * enabled queues, but for now we only implement uAPSD w/o
1356 * TSPEC changes to the ACs, so they're always the same.
1358 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1361 /* if we are in a service period, do nothing */
1362 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1365 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1366 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1368 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1374 static ieee80211_rx_result debug_noinline
1375 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1377 struct sta_info
*sta
= rx
->sta
;
1378 struct sk_buff
*skb
= rx
->skb
;
1379 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1380 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1387 * Update last_rx only for IBSS packets which are for the current
1388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
1394 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1395 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1396 NL80211_IFTYPE_ADHOC
);
1397 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1398 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1399 sta
->last_rx
= jiffies
;
1400 if (ieee80211_is_data(hdr
->frame_control
) &&
1401 !is_multicast_ether_addr(hdr
->addr1
)) {
1402 sta
->last_rx_rate_idx
= status
->rate_idx
;
1403 sta
->last_rx_rate_flag
= status
->flag
;
1404 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1405 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1408 } else if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
) {
1409 sta
->last_rx
= jiffies
;
1410 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1412 * Mesh beacons will update last_rx when if they are found to
1413 * match the current local configuration when processed.
1415 sta
->last_rx
= jiffies
;
1416 if (ieee80211_is_data(hdr
->frame_control
)) {
1417 sta
->last_rx_rate_idx
= status
->rate_idx
;
1418 sta
->last_rx_rate_flag
= status
->flag
;
1419 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1420 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1424 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1425 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1427 sta
->rx_fragments
++;
1428 sta
->rx_bytes
+= rx
->skb
->len
;
1429 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1430 sta
->last_signal
= status
->signal
;
1431 ewma_signal_add(&sta
->avg_signal
, -status
->signal
);
1434 if (status
->chains
) {
1435 sta
->chains
= status
->chains
;
1436 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1437 int signal
= status
->chain_signal
[i
];
1439 if (!(status
->chains
& BIT(i
)))
1442 sta
->chain_signal_last
[i
] = signal
;
1443 ewma_signal_add(&sta
->chain_signal_avg
[i
], -signal
);
1448 * Change STA power saving mode only at the end of a frame
1449 * exchange sequence.
1451 if (!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
) &&
1452 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1453 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1454 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1455 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1456 /* PM bit is only checked in frames where it isn't reserved,
1457 * in AP mode it's reserved in non-bufferable management frames
1458 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1460 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1461 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1462 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1463 if (!ieee80211_has_pm(hdr
->frame_control
))
1466 if (ieee80211_has_pm(hdr
->frame_control
))
1471 /* mesh power save support */
1472 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1473 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1476 * Drop (qos-)data::nullfunc frames silently, since they
1477 * are used only to control station power saving mode.
1479 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1480 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1481 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1484 * If we receive a 4-addr nullfunc frame from a STA
1485 * that was not moved to a 4-addr STA vlan yet send
1486 * the event to userspace and for older hostapd drop
1487 * the frame to the monitor interface.
1489 if (ieee80211_has_a4(hdr
->frame_control
) &&
1490 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1491 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1492 !rx
->sdata
->u
.vlan
.sta
))) {
1493 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1494 cfg80211_rx_unexpected_4addr_frame(
1495 rx
->sdata
->dev
, sta
->sta
.addr
,
1497 return RX_DROP_MONITOR
;
1500 * Update counter and free packet here to avoid
1501 * counting this as a dropped packed.
1504 dev_kfree_skb(rx
->skb
);
1509 } /* ieee80211_rx_h_sta_process */
1511 static ieee80211_rx_result debug_noinline
1512 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1514 struct sk_buff
*skb
= rx
->skb
;
1515 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1516 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1519 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1520 struct ieee80211_key
*sta_ptk
= NULL
;
1521 int mmie_keyidx
= -1;
1523 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1528 * There are four types of keys:
1529 * - GTK (group keys)
1530 * - IGTK (group keys for management frames)
1531 * - PTK (pairwise keys)
1532 * - STK (station-to-station pairwise keys)
1534 * When selecting a key, we have to distinguish between multicast
1535 * (including broadcast) and unicast frames, the latter can only
1536 * use PTKs and STKs while the former always use GTKs and IGTKs.
1537 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1538 * unicast frames can also use key indices like GTKs. Hence, if we
1539 * don't have a PTK/STK we check the key index for a WEP key.
1541 * Note that in a regular BSS, multicast frames are sent by the
1542 * AP only, associated stations unicast the frame to the AP first
1543 * which then multicasts it on their behalf.
1545 * There is also a slight problem in IBSS mode: GTKs are negotiated
1546 * with each station, that is something we don't currently handle.
1547 * The spec seems to expect that one negotiates the same key with
1548 * every station but there's no such requirement; VLANs could be
1552 /* start without a key */
1554 fc
= hdr
->frame_control
;
1557 int keyid
= rx
->sta
->ptk_idx
;
1559 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1560 cs
= rx
->sta
->cipher_scheme
;
1561 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1562 if (unlikely(keyid
< 0))
1563 return RX_DROP_UNUSABLE
;
1565 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1568 if (!ieee80211_has_protected(fc
))
1569 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1571 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1573 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1574 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1576 /* Skip decryption if the frame is not protected. */
1577 if (!ieee80211_has_protected(fc
))
1579 } else if (mmie_keyidx
>= 0) {
1580 /* Broadcast/multicast robust management frame / BIP */
1581 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1582 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1585 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1586 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1587 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1589 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1591 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1592 } else if (!ieee80211_has_protected(fc
)) {
1594 * The frame was not protected, so skip decryption. However, we
1595 * need to set rx->key if there is a key that could have been
1596 * used so that the frame may be dropped if encryption would
1597 * have been expected.
1599 struct ieee80211_key
*key
= NULL
;
1600 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1603 if (ieee80211_is_mgmt(fc
) &&
1604 is_multicast_ether_addr(hdr
->addr1
) &&
1605 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1609 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1610 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1616 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1617 key
= rcu_dereference(sdata
->keys
[i
]);
1630 * The device doesn't give us the IV so we won't be
1631 * able to look up the key. That's ok though, we
1632 * don't need to decrypt the frame, we just won't
1633 * be able to keep statistics accurate.
1634 * Except for key threshold notifications, should
1635 * we somehow allow the driver to tell us which key
1636 * the hardware used if this flag is set?
1638 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1639 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1642 hdrlen
= ieee80211_hdrlen(fc
);
1645 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1647 if (unlikely(keyidx
< 0))
1648 return RX_DROP_UNUSABLE
;
1650 if (rx
->skb
->len
< 8 + hdrlen
)
1651 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1653 * no need to call ieee80211_wep_get_keyidx,
1654 * it verifies a bunch of things we've done already
1656 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1657 keyidx
= keyid
>> 6;
1660 /* check per-station GTK first, if multicast packet */
1661 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1662 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1664 /* if not found, try default key */
1666 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1669 * RSNA-protected unicast frames should always be
1670 * sent with pairwise or station-to-station keys,
1671 * but for WEP we allow using a key index as well.
1674 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1675 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1676 !is_multicast_ether_addr(hdr
->addr1
))
1682 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1683 return RX_DROP_MONITOR
;
1685 /* TODO: add threshold stuff again */
1687 return RX_DROP_MONITOR
;
1690 switch (rx
->key
->conf
.cipher
) {
1691 case WLAN_CIPHER_SUITE_WEP40
:
1692 case WLAN_CIPHER_SUITE_WEP104
:
1693 result
= ieee80211_crypto_wep_decrypt(rx
);
1695 case WLAN_CIPHER_SUITE_TKIP
:
1696 result
= ieee80211_crypto_tkip_decrypt(rx
);
1698 case WLAN_CIPHER_SUITE_CCMP
:
1699 result
= ieee80211_crypto_ccmp_decrypt(
1700 rx
, IEEE80211_CCMP_MIC_LEN
);
1702 case WLAN_CIPHER_SUITE_CCMP_256
:
1703 result
= ieee80211_crypto_ccmp_decrypt(
1704 rx
, IEEE80211_CCMP_256_MIC_LEN
);
1706 case WLAN_CIPHER_SUITE_AES_CMAC
:
1707 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1709 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1710 result
= ieee80211_crypto_aes_cmac_256_decrypt(rx
);
1712 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1713 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1714 result
= ieee80211_crypto_aes_gmac_decrypt(rx
);
1716 case WLAN_CIPHER_SUITE_GCMP
:
1717 case WLAN_CIPHER_SUITE_GCMP_256
:
1718 result
= ieee80211_crypto_gcmp_decrypt(rx
);
1721 result
= ieee80211_crypto_hw_decrypt(rx
);
1724 /* the hdr variable is invalid after the decrypt handlers */
1726 /* either the frame has been decrypted or will be dropped */
1727 status
->flag
|= RX_FLAG_DECRYPTED
;
1732 static inline struct ieee80211_fragment_entry
*
1733 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1734 unsigned int frag
, unsigned int seq
, int rx_queue
,
1735 struct sk_buff
**skb
)
1737 struct ieee80211_fragment_entry
*entry
;
1739 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1740 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1741 sdata
->fragment_next
= 0;
1743 if (!skb_queue_empty(&entry
->skb_list
))
1744 __skb_queue_purge(&entry
->skb_list
);
1746 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1748 entry
->first_frag_time
= jiffies
;
1750 entry
->rx_queue
= rx_queue
;
1751 entry
->last_frag
= frag
;
1753 entry
->extra_len
= 0;
1758 static inline struct ieee80211_fragment_entry
*
1759 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1760 unsigned int frag
, unsigned int seq
,
1761 int rx_queue
, struct ieee80211_hdr
*hdr
)
1763 struct ieee80211_fragment_entry
*entry
;
1766 idx
= sdata
->fragment_next
;
1767 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1768 struct ieee80211_hdr
*f_hdr
;
1772 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1774 entry
= &sdata
->fragments
[idx
];
1775 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1776 entry
->rx_queue
!= rx_queue
||
1777 entry
->last_frag
+ 1 != frag
)
1780 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1783 * Check ftype and addresses are equal, else check next fragment
1785 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1786 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1787 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1788 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1791 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1792 __skb_queue_purge(&entry
->skb_list
);
1801 static ieee80211_rx_result debug_noinline
1802 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1804 struct ieee80211_hdr
*hdr
;
1807 unsigned int frag
, seq
;
1808 struct ieee80211_fragment_entry
*entry
;
1809 struct sk_buff
*skb
;
1810 struct ieee80211_rx_status
*status
;
1812 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1813 fc
= hdr
->frame_control
;
1815 if (ieee80211_is_ctl(fc
))
1818 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1819 frag
= sc
& IEEE80211_SCTL_FRAG
;
1821 if (is_multicast_ether_addr(hdr
->addr1
)) {
1822 I802_DEBUG_INC(rx
->local
->dot11MulticastReceivedFrameCount
);
1826 if (likely(!ieee80211_has_morefrags(fc
) && frag
== 0))
1829 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1831 if (skb_linearize(rx
->skb
))
1832 return RX_DROP_UNUSABLE
;
1835 * skb_linearize() might change the skb->data and
1836 * previously cached variables (in this case, hdr) need to
1837 * be refreshed with the new data.
1839 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1840 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1843 /* This is the first fragment of a new frame. */
1844 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1845 rx
->seqno_idx
, &(rx
->skb
));
1847 (rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
||
1848 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP_256
) &&
1849 ieee80211_has_protected(fc
)) {
1850 int queue
= rx
->security_idx
;
1851 /* Store CCMP PN so that we can verify that the next
1852 * fragment has a sequential PN value. */
1854 memcpy(entry
->last_pn
,
1855 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1856 IEEE80211_CCMP_PN_LEN
);
1861 /* This is a fragment for a frame that should already be pending in
1862 * fragment cache. Add this fragment to the end of the pending entry.
1864 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1865 rx
->seqno_idx
, hdr
);
1867 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1868 return RX_DROP_MONITOR
;
1871 /* Verify that MPDUs within one MSDU have sequential PN values.
1872 * (IEEE 802.11i, 8.3.3.4.5) */
1875 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1878 (rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
&&
1879 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP_256
))
1880 return RX_DROP_UNUSABLE
;
1881 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1882 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1887 queue
= rx
->security_idx
;
1888 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1889 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1890 return RX_DROP_UNUSABLE
;
1891 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1894 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1895 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1896 entry
->last_frag
= frag
;
1897 entry
->extra_len
+= rx
->skb
->len
;
1898 if (ieee80211_has_morefrags(fc
)) {
1903 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1904 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1905 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head_defrag
);
1906 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1908 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1909 __skb_queue_purge(&entry
->skb_list
);
1910 return RX_DROP_UNUSABLE
;
1913 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1914 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1918 /* Complete frame has been reassembled - process it now */
1919 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1922 ieee80211_led_rx(rx
->local
);
1925 rx
->sta
->rx_packets
++;
1929 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1931 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1937 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1939 struct sk_buff
*skb
= rx
->skb
;
1940 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1943 * Pass through unencrypted frames if the hardware has
1944 * decrypted them already.
1946 if (status
->flag
& RX_FLAG_DECRYPTED
)
1949 /* Drop unencrypted frames if key is set. */
1950 if (unlikely(!ieee80211_has_protected(fc
) &&
1951 !ieee80211_is_nullfunc(fc
) &&
1952 ieee80211_is_data(fc
) && rx
->key
))
1958 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1960 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1961 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1962 __le16 fc
= hdr
->frame_control
;
1965 * Pass through unencrypted frames if the hardware has
1966 * decrypted them already.
1968 if (status
->flag
& RX_FLAG_DECRYPTED
)
1971 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1972 if (unlikely(!ieee80211_has_protected(fc
) &&
1973 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1975 if (ieee80211_is_deauth(fc
) ||
1976 ieee80211_is_disassoc(fc
))
1977 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1982 /* BIP does not use Protected field, so need to check MMIE */
1983 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1984 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1985 if (ieee80211_is_deauth(fc
) ||
1986 ieee80211_is_disassoc(fc
))
1987 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1993 * When using MFP, Action frames are not allowed prior to
1994 * having configured keys.
1996 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1997 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
2005 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
2007 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2008 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2009 bool check_port_control
= false;
2010 struct ethhdr
*ehdr
;
2013 *port_control
= false;
2014 if (ieee80211_has_a4(hdr
->frame_control
) &&
2015 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
2018 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2019 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
2021 if (!sdata
->u
.mgd
.use_4addr
)
2024 check_port_control
= true;
2027 if (is_multicast_ether_addr(hdr
->addr1
) &&
2028 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
2031 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
2035 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2036 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
2037 *port_control
= true;
2038 else if (check_port_control
)
2045 * requires that rx->skb is a frame with ethernet header
2047 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
2049 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
2050 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2051 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2054 * Allow EAPOL frames to us/the PAE group address regardless
2055 * of whether the frame was encrypted or not.
2057 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
2058 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
2059 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
2062 if (ieee80211_802_1x_port_control(rx
) ||
2063 ieee80211_drop_unencrypted(rx
, fc
))
2070 * requires that rx->skb is a frame with ethernet header
2073 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
2075 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2076 struct net_device
*dev
= sdata
->dev
;
2077 struct sk_buff
*skb
, *xmit_skb
;
2078 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2079 struct sta_info
*dsta
;
2084 ieee80211_rx_stats(dev
, skb
->len
);
2086 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2087 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
2088 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
2089 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
2090 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
2092 * send multicast frames both to higher layers in
2093 * local net stack and back to the wireless medium
2095 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
2097 net_info_ratelimited("%s: failed to clone multicast frame\n",
2100 dsta
= sta_info_get(sdata
, skb
->data
);
2103 * The destination station is associated to
2104 * this AP (in this VLAN), so send the frame
2105 * directly to it and do not pass it to local
2114 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2116 /* 'align' will only take the values 0 or 2 here since all
2117 * frames are required to be aligned to 2-byte boundaries
2118 * when being passed to mac80211; the code here works just
2119 * as well if that isn't true, but mac80211 assumes it can
2120 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2124 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
2126 if (WARN_ON(skb_headroom(skb
) < 3)) {
2130 u8
*data
= skb
->data
;
2131 size_t len
= skb_headlen(skb
);
2133 memmove(skb
->data
, data
, len
);
2134 skb_set_tail_pointer(skb
, len
);
2141 /* deliver to local stack */
2142 skb
->protocol
= eth_type_trans(skb
, dev
);
2143 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2145 napi_gro_receive(rx
->napi
, skb
);
2147 netif_receive_skb(skb
);
2152 * Send to wireless media and increase priority by 256 to
2153 * keep the received priority instead of reclassifying
2154 * the frame (see cfg80211_classify8021d).
2156 xmit_skb
->priority
+= 256;
2157 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2158 skb_reset_network_header(xmit_skb
);
2159 skb_reset_mac_header(xmit_skb
);
2160 dev_queue_xmit(xmit_skb
);
2164 static ieee80211_rx_result debug_noinline
2165 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2167 struct net_device
*dev
= rx
->sdata
->dev
;
2168 struct sk_buff
*skb
= rx
->skb
;
2169 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2170 __le16 fc
= hdr
->frame_control
;
2171 struct sk_buff_head frame_list
;
2172 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2174 if (unlikely(!ieee80211_is_data(fc
)))
2177 if (unlikely(!ieee80211_is_data_present(fc
)))
2178 return RX_DROP_MONITOR
;
2180 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2183 if (ieee80211_has_a4(hdr
->frame_control
) &&
2184 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2185 !rx
->sdata
->u
.vlan
.sta
)
2186 return RX_DROP_UNUSABLE
;
2188 if (is_multicast_ether_addr(hdr
->addr1
) &&
2189 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2190 rx
->sdata
->u
.vlan
.sta
) ||
2191 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2192 rx
->sdata
->u
.mgd
.use_4addr
)))
2193 return RX_DROP_UNUSABLE
;
2196 __skb_queue_head_init(&frame_list
);
2198 if (skb_linearize(skb
))
2199 return RX_DROP_UNUSABLE
;
2201 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2202 rx
->sdata
->vif
.type
,
2203 rx
->local
->hw
.extra_tx_headroom
, true);
2205 while (!skb_queue_empty(&frame_list
)) {
2206 rx
->skb
= __skb_dequeue(&frame_list
);
2208 if (!ieee80211_frame_allowed(rx
, fc
)) {
2209 dev_kfree_skb(rx
->skb
);
2213 ieee80211_deliver_skb(rx
);
2219 #ifdef CONFIG_MAC80211_MESH
2220 static ieee80211_rx_result
2221 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2223 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2224 struct ieee80211_tx_info
*info
;
2225 struct ieee80211s_hdr
*mesh_hdr
;
2226 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2227 struct ieee80211_local
*local
= rx
->local
;
2228 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2229 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2232 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2233 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2235 /* make sure fixed part of mesh header is there, also checks skb len */
2236 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2237 return RX_DROP_MONITOR
;
2239 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2241 /* make sure full mesh header is there, also checks skb len */
2242 if (!pskb_may_pull(rx
->skb
,
2243 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2244 return RX_DROP_MONITOR
;
2246 /* reload pointers */
2247 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2248 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2250 if (ieee80211_drop_unencrypted(rx
, hdr
->frame_control
))
2251 return RX_DROP_MONITOR
;
2253 /* frame is in RMC, don't forward */
2254 if (ieee80211_is_data(hdr
->frame_control
) &&
2255 is_multicast_ether_addr(hdr
->addr1
) &&
2256 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2257 return RX_DROP_MONITOR
;
2259 if (!ieee80211_is_data(hdr
->frame_control
))
2263 return RX_DROP_MONITOR
;
2265 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2266 struct mesh_path
*mppath
;
2270 if (is_multicast_ether_addr(hdr
->addr1
)) {
2271 mpp_addr
= hdr
->addr3
;
2272 proxied_addr
= mesh_hdr
->eaddr1
;
2273 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2274 /* has_a4 already checked in ieee80211_rx_mesh_check */
2275 mpp_addr
= hdr
->addr4
;
2276 proxied_addr
= mesh_hdr
->eaddr2
;
2278 return RX_DROP_MONITOR
;
2282 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2284 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2286 spin_lock_bh(&mppath
->state_lock
);
2287 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2288 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2289 spin_unlock_bh(&mppath
->state_lock
);
2294 /* Frame has reached destination. Don't forward */
2295 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2296 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2299 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2300 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2301 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2302 return RX_DROP_MONITOR
;
2304 skb_set_queue_mapping(skb
, q
);
2306 if (!--mesh_hdr
->ttl
) {
2307 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2311 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2314 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2316 net_info_ratelimited("%s: failed to clone mesh frame\n",
2321 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2322 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2323 info
= IEEE80211_SKB_CB(fwd_skb
);
2324 memset(info
, 0, sizeof(*info
));
2325 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2326 info
->control
.vif
= &rx
->sdata
->vif
;
2327 info
->control
.jiffies
= jiffies
;
2328 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2329 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2330 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2331 /* update power mode indication when forwarding */
2332 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2333 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2334 /* mesh power mode flags updated in mesh_nexthop_lookup */
2335 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2337 /* unable to resolve next hop */
2338 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2340 WLAN_REASON_MESH_PATH_NOFORWARD
,
2342 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2344 return RX_DROP_MONITOR
;
2347 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2348 ieee80211_add_pending_skb(local
, fwd_skb
);
2350 if (is_multicast_ether_addr(hdr
->addr1
))
2352 return RX_DROP_MONITOR
;
2356 static ieee80211_rx_result debug_noinline
2357 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2359 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2360 struct ieee80211_local
*local
= rx
->local
;
2361 struct net_device
*dev
= sdata
->dev
;
2362 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2363 __le16 fc
= hdr
->frame_control
;
2367 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2370 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2371 return RX_DROP_MONITOR
;
2374 /* The seqno index has the same property as needed
2375 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2376 * for non-QoS-data frames. Here we know it's a data
2377 * frame, so count MSDUs.
2379 rx
->sta
->rx_msdu
[rx
->seqno_idx
]++;
2383 * Send unexpected-4addr-frame event to hostapd. For older versions,
2384 * also drop the frame to cooked monitor interfaces.
2386 if (ieee80211_has_a4(hdr
->frame_control
) &&
2387 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2389 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2390 cfg80211_rx_unexpected_4addr_frame(
2391 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2392 return RX_DROP_MONITOR
;
2395 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2397 return RX_DROP_UNUSABLE
;
2399 if (!ieee80211_frame_allowed(rx
, fc
))
2400 return RX_DROP_MONITOR
;
2402 /* directly handle TDLS channel switch requests/responses */
2403 if (unlikely(((struct ethhdr
*)rx
->skb
->data
)->h_proto
==
2404 cpu_to_be16(ETH_P_TDLS
))) {
2405 struct ieee80211_tdls_data
*tf
= (void *)rx
->skb
->data
;
2407 if (pskb_may_pull(rx
->skb
,
2408 offsetof(struct ieee80211_tdls_data
, u
)) &&
2409 tf
->payload_type
== WLAN_TDLS_SNAP_RFTYPE
&&
2410 tf
->category
== WLAN_CATEGORY_TDLS
&&
2411 (tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_REQUEST
||
2412 tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_RESPONSE
)) {
2413 skb_queue_tail(&local
->skb_queue_tdls_chsw
, rx
->skb
);
2414 schedule_work(&local
->tdls_chsw_work
);
2416 rx
->sta
->rx_packets
++;
2422 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2423 unlikely(port_control
) && sdata
->bss
) {
2424 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2432 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2433 !is_multicast_ether_addr(
2434 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2435 (!local
->scanning
&&
2436 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2437 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2438 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2441 ieee80211_deliver_skb(rx
);
2446 static ieee80211_rx_result debug_noinline
2447 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2449 struct sk_buff
*skb
= rx
->skb
;
2450 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2451 struct tid_ampdu_rx
*tid_agg_rx
;
2455 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2458 if (ieee80211_is_back_req(bar
->frame_control
)) {
2460 __le16 control
, start_seq_num
;
2461 } __packed bar_data
;
2462 struct ieee80211_event event
= {
2463 .type
= BAR_RX_EVENT
,
2467 return RX_DROP_MONITOR
;
2469 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2470 &bar_data
, sizeof(bar_data
)))
2471 return RX_DROP_MONITOR
;
2473 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2475 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2477 return RX_DROP_MONITOR
;
2479 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2480 event
.u
.ba
.tid
= tid
;
2481 event
.u
.ba
.ssn
= start_seq_num
;
2482 event
.u
.ba
.sta
= &rx
->sta
->sta
;
2484 /* reset session timer */
2485 if (tid_agg_rx
->timeout
)
2486 mod_timer(&tid_agg_rx
->session_timer
,
2487 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2489 spin_lock(&tid_agg_rx
->reorder_lock
);
2490 /* release stored frames up to start of BAR */
2491 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2492 start_seq_num
, frames
);
2493 spin_unlock(&tid_agg_rx
->reorder_lock
);
2495 drv_event_callback(rx
->local
, rx
->sdata
, &event
);
2502 * After this point, we only want management frames,
2503 * so we can drop all remaining control frames to
2504 * cooked monitor interfaces.
2506 return RX_DROP_MONITOR
;
2509 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2510 struct ieee80211_mgmt
*mgmt
,
2513 struct ieee80211_local
*local
= sdata
->local
;
2514 struct sk_buff
*skb
;
2515 struct ieee80211_mgmt
*resp
;
2517 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2518 /* Not to own unicast address */
2522 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2523 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2524 /* Not from the current AP or not associated yet. */
2528 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2529 /* Too short SA Query request frame */
2533 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2537 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2538 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2539 memset(resp
, 0, 24);
2540 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2541 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2542 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2543 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2544 IEEE80211_STYPE_ACTION
);
2545 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2546 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2547 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2548 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2549 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2550 WLAN_SA_QUERY_TR_ID_LEN
);
2552 ieee80211_tx_skb(sdata
, skb
);
2555 static ieee80211_rx_result debug_noinline
2556 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2558 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2559 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2562 * From here on, look only at management frames.
2563 * Data and control frames are already handled,
2564 * and unknown (reserved) frames are useless.
2566 if (rx
->skb
->len
< 24)
2567 return RX_DROP_MONITOR
;
2569 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2570 return RX_DROP_MONITOR
;
2572 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2573 ieee80211_is_beacon(mgmt
->frame_control
) &&
2574 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2577 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
2578 sig
= status
->signal
;
2580 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2581 rx
->skb
->data
, rx
->skb
->len
,
2583 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2586 if (ieee80211_drop_unencrypted_mgmt(rx
))
2587 return RX_DROP_UNUSABLE
;
2592 static ieee80211_rx_result debug_noinline
2593 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2595 struct ieee80211_local
*local
= rx
->local
;
2596 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2597 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2598 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2599 int len
= rx
->skb
->len
;
2601 if (!ieee80211_is_action(mgmt
->frame_control
))
2604 /* drop too small frames */
2605 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2606 return RX_DROP_UNUSABLE
;
2608 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2609 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2610 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2611 return RX_DROP_UNUSABLE
;
2613 switch (mgmt
->u
.action
.category
) {
2614 case WLAN_CATEGORY_HT
:
2615 /* reject HT action frames from stations not supporting HT */
2616 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2619 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2620 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2621 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2622 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2623 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2626 /* verify action & smps_control/chanwidth are present */
2627 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2630 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2631 case WLAN_HT_ACTION_SMPS
: {
2632 struct ieee80211_supported_band
*sband
;
2633 enum ieee80211_smps_mode smps_mode
;
2635 /* convert to HT capability */
2636 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2637 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2638 smps_mode
= IEEE80211_SMPS_OFF
;
2640 case WLAN_HT_SMPS_CONTROL_STATIC
:
2641 smps_mode
= IEEE80211_SMPS_STATIC
;
2643 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2644 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2650 /* if no change do nothing */
2651 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2653 rx
->sta
->sta
.smps_mode
= smps_mode
;
2655 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2657 rate_control_rate_update(local
, sband
, rx
->sta
,
2658 IEEE80211_RC_SMPS_CHANGED
);
2661 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2662 struct ieee80211_supported_band
*sband
;
2663 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2664 enum ieee80211_sta_rx_bandwidth max_bw
, new_bw
;
2666 /* If it doesn't support 40 MHz it can't change ... */
2667 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2668 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2671 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2672 max_bw
= IEEE80211_STA_RX_BW_20
;
2674 max_bw
= ieee80211_sta_cap_rx_bw(rx
->sta
);
2676 /* set cur_max_bandwidth and recalc sta bw */
2677 rx
->sta
->cur_max_bandwidth
= max_bw
;
2678 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2680 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2683 rx
->sta
->sta
.bandwidth
= new_bw
;
2684 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2686 rate_control_rate_update(local
, sband
, rx
->sta
,
2687 IEEE80211_RC_BW_CHANGED
);
2695 case WLAN_CATEGORY_PUBLIC
:
2696 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2698 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2702 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2704 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2705 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2707 if (len
< offsetof(struct ieee80211_mgmt
,
2708 u
.action
.u
.ext_chan_switch
.variable
))
2711 case WLAN_CATEGORY_VHT
:
2712 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2713 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2714 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2715 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2716 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2719 /* verify action code is present */
2720 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2723 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2724 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2727 /* verify opmode is present */
2728 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2731 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2733 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2734 opmode
, status
->band
,
2742 case WLAN_CATEGORY_BACK
:
2743 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2744 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2745 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2746 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2747 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2750 /* verify action_code is present */
2751 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2754 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2755 case WLAN_ACTION_ADDBA_REQ
:
2756 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2757 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2760 case WLAN_ACTION_ADDBA_RESP
:
2761 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2762 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2765 case WLAN_ACTION_DELBA
:
2766 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2767 sizeof(mgmt
->u
.action
.u
.delba
)))
2775 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2776 /* verify action_code is present */
2777 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2780 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2781 case WLAN_ACTION_SPCT_MSR_REQ
:
2782 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2785 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2786 sizeof(mgmt
->u
.action
.u
.measurement
)))
2789 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2792 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2794 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2796 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2797 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2800 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2801 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2802 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2805 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2806 bssid
= sdata
->u
.mgd
.bssid
;
2807 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2808 bssid
= sdata
->u
.ibss
.bssid
;
2809 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2814 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2821 case WLAN_CATEGORY_SA_QUERY
:
2822 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2823 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2826 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2827 case WLAN_ACTION_SA_QUERY_REQUEST
:
2828 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2830 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2834 case WLAN_CATEGORY_SELF_PROTECTED
:
2835 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2836 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2839 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2840 case WLAN_SP_MESH_PEERING_OPEN
:
2841 case WLAN_SP_MESH_PEERING_CLOSE
:
2842 case WLAN_SP_MESH_PEERING_CONFIRM
:
2843 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2845 if (sdata
->u
.mesh
.user_mpm
)
2846 /* userspace handles this frame */
2849 case WLAN_SP_MGK_INFORM
:
2850 case WLAN_SP_MGK_ACK
:
2851 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2856 case WLAN_CATEGORY_MESH_ACTION
:
2857 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2858 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2861 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2863 if (mesh_action_is_path_sel(mgmt
) &&
2864 !mesh_path_sel_is_hwmp(sdata
))
2872 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2873 /* will return in the next handlers */
2878 rx
->sta
->rx_packets
++;
2879 dev_kfree_skb(rx
->skb
);
2883 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2884 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2885 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2887 rx
->sta
->rx_packets
++;
2891 static ieee80211_rx_result debug_noinline
2892 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2894 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2897 /* skip known-bad action frames and return them in the next handler */
2898 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2902 * Getting here means the kernel doesn't know how to handle
2903 * it, but maybe userspace does ... include returned frames
2904 * so userspace can register for those to know whether ones
2905 * it transmitted were processed or returned.
2908 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
2909 sig
= status
->signal
;
2911 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2912 rx
->skb
->data
, rx
->skb
->len
, 0)) {
2914 rx
->sta
->rx_packets
++;
2915 dev_kfree_skb(rx
->skb
);
2922 static ieee80211_rx_result debug_noinline
2923 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2925 struct ieee80211_local
*local
= rx
->local
;
2926 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2927 struct sk_buff
*nskb
;
2928 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2929 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2931 if (!ieee80211_is_action(mgmt
->frame_control
))
2935 * For AP mode, hostapd is responsible for handling any action
2936 * frames that we didn't handle, including returning unknown
2937 * ones. For all other modes we will return them to the sender,
2938 * setting the 0x80 bit in the action category, as required by
2939 * 802.11-2012 9.24.4.
2940 * Newer versions of hostapd shall also use the management frame
2941 * registration mechanisms, but older ones still use cooked
2942 * monitor interfaces so push all frames there.
2944 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2945 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2946 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2947 return RX_DROP_MONITOR
;
2949 if (is_multicast_ether_addr(mgmt
->da
))
2950 return RX_DROP_MONITOR
;
2952 /* do not return rejected action frames */
2953 if (mgmt
->u
.action
.category
& 0x80)
2954 return RX_DROP_UNUSABLE
;
2956 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2959 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2961 nmgmt
->u
.action
.category
|= 0x80;
2962 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2963 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2965 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2967 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2968 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2970 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2971 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2972 IEEE80211_TX_CTL_NO_CCK_RATE
;
2973 if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
2975 local
->hw
.offchannel_tx_hw_queue
;
2978 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2981 dev_kfree_skb(rx
->skb
);
2985 static ieee80211_rx_result debug_noinline
2986 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2988 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2989 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2992 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2994 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2995 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2996 sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
2997 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2998 return RX_DROP_MONITOR
;
3001 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
3002 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
3003 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
3004 /* process for all: mesh, mlme, ibss */
3006 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
3007 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
3008 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
3009 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
3010 if (is_multicast_ether_addr(mgmt
->da
) &&
3011 !is_broadcast_ether_addr(mgmt
->da
))
3012 return RX_DROP_MONITOR
;
3014 /* process only for station */
3015 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
3016 return RX_DROP_MONITOR
;
3018 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
3019 /* process only for ibss and mesh */
3020 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
3021 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
3022 return RX_DROP_MONITOR
;
3025 return RX_DROP_MONITOR
;
3028 /* queue up frame and kick off work to process it */
3029 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
3030 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
3031 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
3033 rx
->sta
->rx_packets
++;
3038 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
3039 struct ieee80211_rate
*rate
)
3041 struct ieee80211_sub_if_data
*sdata
;
3042 struct ieee80211_local
*local
= rx
->local
;
3043 struct sk_buff
*skb
= rx
->skb
, *skb2
;
3044 struct net_device
*prev_dev
= NULL
;
3045 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3046 int needed_headroom
;
3049 * If cooked monitor has been processed already, then
3050 * don't do it again. If not, set the flag.
3052 if (rx
->flags
& IEEE80211_RX_CMNTR
)
3054 rx
->flags
|= IEEE80211_RX_CMNTR
;
3056 /* If there are no cooked monitor interfaces, just free the SKB */
3057 if (!local
->cooked_mntrs
)
3060 /* vendor data is long removed here */
3061 status
->flag
&= ~RX_FLAG_RADIOTAP_VENDOR_DATA
;
3062 /* room for the radiotap header based on driver features */
3063 needed_headroom
= ieee80211_rx_radiotap_hdrlen(local
, status
, skb
);
3065 if (skb_headroom(skb
) < needed_headroom
&&
3066 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
3069 /* prepend radiotap information */
3070 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
3073 skb_set_mac_header(skb
, 0);
3074 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3075 skb
->pkt_type
= PACKET_OTHERHOST
;
3076 skb
->protocol
= htons(ETH_P_802_2
);
3078 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3079 if (!ieee80211_sdata_running(sdata
))
3082 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
3083 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
3087 skb2
= skb_clone(skb
, GFP_ATOMIC
);
3089 skb2
->dev
= prev_dev
;
3090 netif_receive_skb(skb2
);
3094 prev_dev
= sdata
->dev
;
3095 ieee80211_rx_stats(sdata
->dev
, skb
->len
);
3099 skb
->dev
= prev_dev
;
3100 netif_receive_skb(skb
);
3108 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
3109 ieee80211_rx_result res
)
3112 case RX_DROP_MONITOR
:
3113 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3115 rx
->sta
->rx_dropped
++;
3118 struct ieee80211_rate
*rate
= NULL
;
3119 struct ieee80211_supported_band
*sband
;
3120 struct ieee80211_rx_status
*status
;
3122 status
= IEEE80211_SKB_RXCB((rx
->skb
));
3124 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
3125 if (!(status
->flag
& RX_FLAG_HT
) &&
3126 !(status
->flag
& RX_FLAG_VHT
))
3127 rate
= &sband
->bitrates
[status
->rate_idx
];
3129 ieee80211_rx_cooked_monitor(rx
, rate
);
3132 case RX_DROP_UNUSABLE
:
3133 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3135 rx
->sta
->rx_dropped
++;
3136 dev_kfree_skb(rx
->skb
);
3139 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
3144 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
3145 struct sk_buff_head
*frames
)
3147 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3148 struct sk_buff
*skb
;
3150 #define CALL_RXH(rxh) \
3153 if (res != RX_CONTINUE) \
3157 /* Lock here to avoid hitting all of the data used in the RX
3158 * path (e.g. key data, station data, ...) concurrently when
3159 * a frame is released from the reorder buffer due to timeout
3160 * from the timer, potentially concurrently with RX from the
3163 spin_lock_bh(&rx
->local
->rx_path_lock
);
3165 while ((skb
= __skb_dequeue(frames
))) {
3167 * all the other fields are valid across frames
3168 * that belong to an aMPDU since they are on the
3169 * same TID from the same station
3173 CALL_RXH(ieee80211_rx_h_check_more_data
)
3174 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
3175 CALL_RXH(ieee80211_rx_h_sta_process
)
3176 CALL_RXH(ieee80211_rx_h_decrypt
)
3177 CALL_RXH(ieee80211_rx_h_defragment
)
3178 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
3179 /* must be after MMIC verify so header is counted in MPDU mic */
3180 #ifdef CONFIG_MAC80211_MESH
3181 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3182 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3184 CALL_RXH(ieee80211_rx_h_amsdu
)
3185 CALL_RXH(ieee80211_rx_h_data
)
3187 /* special treatment -- needs the queue */
3188 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3189 if (res
!= RX_CONTINUE
)
3192 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3193 CALL_RXH(ieee80211_rx_h_action
)
3194 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3195 CALL_RXH(ieee80211_rx_h_action_return
)
3196 CALL_RXH(ieee80211_rx_h_mgmt
)
3199 ieee80211_rx_handlers_result(rx
, res
);
3204 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3207 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3209 struct sk_buff_head reorder_release
;
3210 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3212 __skb_queue_head_init(&reorder_release
);
3214 #define CALL_RXH(rxh) \
3217 if (res != RX_CONTINUE) \
3221 CALL_RXH(ieee80211_rx_h_check_dup
)
3222 CALL_RXH(ieee80211_rx_h_check
)
3224 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3226 ieee80211_rx_handlers(rx
, &reorder_release
);
3230 ieee80211_rx_handlers_result(rx
, res
);
3236 * This function makes calls into the RX path, therefore
3237 * it has to be invoked under RCU read lock.
3239 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3241 struct sk_buff_head frames
;
3242 struct ieee80211_rx_data rx
= {
3244 .sdata
= sta
->sdata
,
3245 .local
= sta
->local
,
3246 /* This is OK -- must be QoS data frame */
3247 .security_idx
= tid
,
3249 .napi
= NULL
, /* must be NULL to not have races */
3251 struct tid_ampdu_rx
*tid_agg_rx
;
3253 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3257 __skb_queue_head_init(&frames
);
3259 spin_lock(&tid_agg_rx
->reorder_lock
);
3260 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3261 spin_unlock(&tid_agg_rx
->reorder_lock
);
3263 if (!skb_queue_empty(&frames
)) {
3264 struct ieee80211_event event
= {
3265 .type
= BA_FRAME_TIMEOUT
,
3267 .u
.ba
.sta
= &sta
->sta
,
3269 drv_event_callback(rx
.local
, rx
.sdata
, &event
);
3272 ieee80211_rx_handlers(&rx
, &frames
);
3275 /* main receive path */
3277 static bool ieee80211_accept_frame(struct ieee80211_rx_data
*rx
)
3279 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3280 struct sk_buff
*skb
= rx
->skb
;
3281 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3282 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3283 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3284 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3286 switch (sdata
->vif
.type
) {
3287 case NL80211_IFTYPE_STATION
:
3288 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3292 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3293 case NL80211_IFTYPE_ADHOC
:
3296 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3297 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3299 if (ieee80211_is_beacon(hdr
->frame_control
))
3301 if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
))
3304 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3308 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3309 rate_idx
= 0; /* TODO: HT/VHT rates */
3311 rate_idx
= status
->rate_idx
;
3312 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3316 case NL80211_IFTYPE_OCB
:
3319 if (!ieee80211_is_data_present(hdr
->frame_control
))
3321 if (!is_broadcast_ether_addr(bssid
))
3324 !ether_addr_equal(sdata
->dev
->dev_addr
, hdr
->addr1
))
3328 if (status
->flag
& RX_FLAG_HT
)
3329 rate_idx
= 0; /* TODO: HT rates */
3331 rate_idx
= status
->rate_idx
;
3332 ieee80211_ocb_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3336 case NL80211_IFTYPE_MESH_POINT
:
3339 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3340 case NL80211_IFTYPE_AP_VLAN
:
3341 case NL80211_IFTYPE_AP
:
3343 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3345 if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3347 * Accept public action frames even when the
3348 * BSSID doesn't match, this is used for P2P
3349 * and location updates. Note that mac80211
3350 * itself never looks at these frames.
3353 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3355 if (ieee80211_is_public_action(hdr
, skb
->len
))
3357 return ieee80211_is_beacon(hdr
->frame_control
);
3360 if (!ieee80211_has_tods(hdr
->frame_control
)) {
3361 /* ignore data frames to TDLS-peers */
3362 if (ieee80211_is_data(hdr
->frame_control
))
3364 /* ignore action frames to TDLS-peers */
3365 if (ieee80211_is_action(hdr
->frame_control
) &&
3366 !ether_addr_equal(bssid
, hdr
->addr1
))
3370 case NL80211_IFTYPE_WDS
:
3371 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3373 return ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
);
3374 case NL80211_IFTYPE_P2P_DEVICE
:
3375 return ieee80211_is_public_action(hdr
, skb
->len
) ||
3376 ieee80211_is_probe_req(hdr
->frame_control
) ||
3377 ieee80211_is_probe_resp(hdr
->frame_control
) ||
3378 ieee80211_is_beacon(hdr
->frame_control
);
3388 * This function returns whether or not the SKB
3389 * was destined for RX processing or not, which,
3390 * if consume is true, is equivalent to whether
3391 * or not the skb was consumed.
3393 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3394 struct sk_buff
*skb
, bool consume
)
3396 struct ieee80211_local
*local
= rx
->local
;
3397 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3401 if (!ieee80211_accept_frame(rx
))
3405 skb
= skb_copy(skb
, GFP_ATOMIC
);
3407 if (net_ratelimit())
3408 wiphy_debug(local
->hw
.wiphy
,
3409 "failed to copy skb for %s\n",
3417 ieee80211_invoke_rx_handlers(rx
);
3422 * This is the actual Rx frames handler. as it belongs to Rx path it must
3423 * be called with rcu_read_lock protection.
3425 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3426 struct sk_buff
*skb
,
3427 struct napi_struct
*napi
)
3429 struct ieee80211_local
*local
= hw_to_local(hw
);
3430 struct ieee80211_sub_if_data
*sdata
;
3431 struct ieee80211_hdr
*hdr
;
3433 struct ieee80211_rx_data rx
;
3434 struct ieee80211_sub_if_data
*prev
;
3435 struct sta_info
*sta
, *prev_sta
;
3436 struct rhash_head
*tmp
;
3439 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3440 memset(&rx
, 0, sizeof(rx
));
3445 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3446 I802_DEBUG_INC(local
->dot11ReceivedFragmentCount
);
3448 if (ieee80211_is_mgmt(fc
)) {
3449 /* drop frame if too short for header */
3450 if (skb
->len
< ieee80211_hdrlen(fc
))
3453 err
= skb_linearize(skb
);
3455 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3463 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3464 ieee80211_parse_qos(&rx
);
3465 ieee80211_verify_alignment(&rx
);
3467 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3468 ieee80211_is_beacon(hdr
->frame_control
)))
3469 ieee80211_scan_rx(local
, skb
);
3471 if (ieee80211_is_data(fc
)) {
3472 const struct bucket_table
*tbl
;
3476 tbl
= rht_dereference_rcu(local
->sta_hash
.tbl
, &local
->sta_hash
);
3478 for_each_sta_info(local
, tbl
, hdr
->addr2
, sta
, tmp
) {
3485 rx
.sdata
= prev_sta
->sdata
;
3486 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3493 rx
.sdata
= prev_sta
->sdata
;
3495 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3503 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3504 if (!ieee80211_sdata_running(sdata
))
3507 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3508 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3512 * frame is destined for this interface, but if it's
3513 * not also for the previous one we handle that after
3514 * the loop to avoid copying the SKB once too much
3522 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3524 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3530 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3533 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3542 * This is the receive path handler. It is called by a low level driver when an
3543 * 802.11 MPDU is received from the hardware.
3545 void ieee80211_rx_napi(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
3546 struct napi_struct
*napi
)
3548 struct ieee80211_local
*local
= hw_to_local(hw
);
3549 struct ieee80211_rate
*rate
= NULL
;
3550 struct ieee80211_supported_band
*sband
;
3551 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3553 WARN_ON_ONCE(softirq_count() == 0);
3555 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3558 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3559 if (WARN_ON(!sband
))
3563 * If we're suspending, it is possible although not too likely
3564 * that we'd be receiving frames after having already partially
3565 * quiesced the stack. We can't process such frames then since
3566 * that might, for example, cause stations to be added or other
3567 * driver callbacks be invoked.
3569 if (unlikely(local
->quiescing
|| local
->suspended
))
3572 /* We might be during a HW reconfig, prevent Rx for the same reason */
3573 if (unlikely(local
->in_reconfig
))
3577 * The same happens when we're not even started,
3578 * but that's worth a warning.
3580 if (WARN_ON(!local
->started
))
3583 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3585 * Validate the rate, unless a PLCP error means that
3586 * we probably can't have a valid rate here anyway.
3589 if (status
->flag
& RX_FLAG_HT
) {
3591 * rate_idx is MCS index, which can be [0-76]
3594 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3596 * Anything else would be some sort of driver or
3597 * hardware error. The driver should catch hardware
3600 if (WARN(status
->rate_idx
> 76,
3601 "Rate marked as an HT rate but passed "
3602 "status->rate_idx is not "
3603 "an MCS index [0-76]: %d (0x%02x)\n",
3607 } else if (status
->flag
& RX_FLAG_VHT
) {
3608 if (WARN_ONCE(status
->rate_idx
> 9 ||
3610 status
->vht_nss
> 8,
3611 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3612 status
->rate_idx
, status
->vht_nss
))
3615 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3617 rate
= &sband
->bitrates
[status
->rate_idx
];
3621 status
->rx_flags
= 0;
3624 * key references and virtual interfaces are protected using RCU
3625 * and this requires that we are in a read-side RCU section during
3626 * receive processing
3631 * Frames with failed FCS/PLCP checksum are not returned,
3632 * all other frames are returned without radiotap header
3633 * if it was previously present.
3634 * Also, frames with less than 16 bytes are dropped.
3636 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3642 ieee80211_tpt_led_trig_rx(local
,
3643 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3645 __ieee80211_rx_handle_packet(hw
, skb
, napi
);
3653 EXPORT_SYMBOL(ieee80211_rx_napi
);
3655 /* This is a version of the rx handler that can be called from hard irq
3656 * context. Post the skb on the queue and schedule the tasklet */
3657 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3659 struct ieee80211_local
*local
= hw_to_local(hw
);
3661 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3663 skb
->pkt_type
= IEEE80211_RX_MSG
;
3664 skb_queue_tail(&local
->skb_queue
, skb
);
3665 tasklet_schedule(&local
->tasklet
);
3667 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);