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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
43 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
45 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
46 if (likely(skb
->len
> FCS_LEN
))
47 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
56 if (status
->vendor_radiotap_len
)
57 __pskb_pull(skb
, status
->vendor_radiotap_len
);
62 static inline int should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
)
64 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
65 struct ieee80211_hdr
*hdr
;
67 hdr
= (void *)(skb
->data
+ status
->vendor_radiotap_len
);
69 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
70 RX_FLAG_FAILED_PLCP_CRC
|
71 RX_FLAG_AMPDU_IS_ZEROLEN
))
73 if (unlikely(skb
->len
< 16 + present_fcs_len
+
74 status
->vendor_radiotap_len
))
76 if (ieee80211_is_ctl(hdr
->frame_control
) &&
77 !ieee80211_is_pspoll(hdr
->frame_control
) &&
78 !ieee80211_is_back_req(hdr
->frame_control
))
84 ieee80211_rx_radiotap_space(struct ieee80211_local
*local
,
85 struct ieee80211_rx_status
*status
)
89 /* always present fields */
90 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
92 /* allocate extra bitmaps */
93 if (status
->vendor_radiotap_len
)
96 len
+= 4 * hweight8(status
->chains
);
98 if (ieee80211_have_rx_timestamp(status
)) {
102 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
105 /* antenna field, if we don't have per-chain info */
109 /* padding for RX_FLAGS if necessary */
112 if (status
->flag
& RX_FLAG_HT
) /* HT info */
115 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
120 if (status
->flag
& RX_FLAG_VHT
) {
125 if (status
->chains
) {
126 /* antenna and antenna signal fields */
127 len
+= 2 * hweight8(status
->chains
);
130 if (status
->vendor_radiotap_len
) {
131 if (WARN_ON_ONCE(status
->vendor_radiotap_align
== 0))
132 status
->vendor_radiotap_align
= 1;
133 /* align standard part of vendor namespace */
135 /* allocate standard part of vendor namespace */
137 /* align vendor-defined part */
138 len
= ALIGN(len
, status
->vendor_radiotap_align
);
139 /* vendor-defined part is already in skb */
146 * ieee80211_add_rx_radiotap_header - add radiotap header
148 * add a radiotap header containing all the fields which the hardware provided.
151 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
153 struct ieee80211_rate
*rate
,
154 int rtap_len
, bool has_fcs
)
156 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
157 struct ieee80211_radiotap_header
*rthdr
;
162 u16 channel_flags
= 0;
164 unsigned long chains
= status
->chains
;
167 if (!(has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)))
170 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
171 memset(rthdr
, 0, rtap_len
);
172 it_present
= &rthdr
->it_present
;
174 /* radiotap header, set always present flags */
175 rthdr
->it_len
= cpu_to_le16(rtap_len
+ status
->vendor_radiotap_len
);
176 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
177 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
178 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
181 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
183 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
185 BIT(IEEE80211_RADIOTAP_EXT
) |
186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
187 put_unaligned_le32(it_present_val
, it_present
);
189 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
193 if (status
->vendor_radiotap_len
) {
194 it_present_val
|= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE
) |
195 BIT(IEEE80211_RADIOTAP_EXT
);
196 put_unaligned_le32(it_present_val
, it_present
);
198 it_present_val
= status
->vendor_radiotap_bitmap
;
201 put_unaligned_le32(it_present_val
, it_present
);
203 pos
= (void *)(it_present
+ 1);
205 /* the order of the following fields is important */
207 /* IEEE80211_RADIOTAP_TSFT */
208 if (ieee80211_have_rx_timestamp(status
)) {
210 while ((pos
- (u8
*)rthdr
) & 7)
213 ieee80211_calculate_rx_timestamp(local
, status
,
216 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
220 /* IEEE80211_RADIOTAP_FLAGS */
221 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
222 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
223 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
224 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
225 if (status
->flag
& RX_FLAG_SHORTPRE
)
226 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
229 /* IEEE80211_RADIOTAP_RATE */
230 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
232 * Without rate information don't add it. If we have,
233 * MCS information is a separate field in radiotap,
234 * added below. The byte here is needed as padding
235 * for the channel though, so initialise it to 0.
240 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
241 if (status
->flag
& RX_FLAG_10MHZ
)
243 else if (status
->flag
& RX_FLAG_5MHZ
)
245 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
249 /* IEEE80211_RADIOTAP_CHANNEL */
250 put_unaligned_le16(status
->freq
, pos
);
252 if (status
->flag
& RX_FLAG_10MHZ
)
253 channel_flags
|= IEEE80211_CHAN_HALF
;
254 else if (status
->flag
& RX_FLAG_5MHZ
)
255 channel_flags
|= IEEE80211_CHAN_QUARTER
;
257 if (status
->band
== IEEE80211_BAND_5GHZ
)
258 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
259 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
260 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
261 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
262 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
264 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
266 channel_flags
|= IEEE80211_CHAN_2GHZ
;
267 put_unaligned_le16(channel_flags
, pos
);
270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
271 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
272 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
273 *pos
= status
->signal
;
275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
281 if (!status
->chains
) {
282 /* IEEE80211_RADIOTAP_ANTENNA */
283 *pos
= status
->antenna
;
287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
289 /* IEEE80211_RADIOTAP_RX_FLAGS */
290 /* ensure 2 byte alignment for the 2 byte field as required */
291 if ((pos
- (u8
*)rthdr
) & 1)
293 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
294 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
295 put_unaligned_le16(rx_flags
, pos
);
298 if (status
->flag
& RX_FLAG_HT
) {
301 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
302 *pos
++ = local
->hw
.radiotap_mcs_details
;
304 if (status
->flag
& RX_FLAG_SHORT_GI
)
305 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
306 if (status
->flag
& RX_FLAG_40MHZ
)
307 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
308 if (status
->flag
& RX_FLAG_HT_GF
)
309 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
310 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
311 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
313 *pos
++ = status
->rate_idx
;
316 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
319 /* ensure 4 byte alignment */
320 while ((pos
- (u8
*)rthdr
) & 3)
323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
324 put_unaligned_le32(status
->ampdu_reference
, pos
);
326 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
327 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
328 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
329 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
330 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
331 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
332 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
333 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
334 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
335 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
336 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
337 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
338 put_unaligned_le16(flags
, pos
);
340 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
341 *pos
++ = status
->ampdu_delimiter_crc
;
347 if (status
->flag
& RX_FLAG_VHT
) {
348 u16 known
= local
->hw
.radiotap_vht_details
;
350 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
351 /* known field - how to handle 80+80? */
352 if (status
->flag
& RX_FLAG_80P80MHZ
)
353 known
&= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
;
354 put_unaligned_le16(known
, pos
);
357 if (status
->flag
& RX_FLAG_SHORT_GI
)
358 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
361 if (status
->flag
& RX_FLAG_80MHZ
)
363 else if (status
->flag
& RX_FLAG_80P80MHZ
)
364 *pos
++ = 0; /* marked not known above */
365 else if (status
->flag
& RX_FLAG_160MHZ
)
367 else if (status
->flag
& RX_FLAG_40MHZ
)
372 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
382 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
383 *pos
++ = status
->chain_signal
[chain
];
387 if (status
->vendor_radiotap_len
) {
388 /* ensure 2 byte alignment for the vendor field as required */
389 if ((pos
- (u8
*)rthdr
) & 1)
391 *pos
++ = status
->vendor_radiotap_oui
[0];
392 *pos
++ = status
->vendor_radiotap_oui
[1];
393 *pos
++ = status
->vendor_radiotap_oui
[2];
394 *pos
++ = status
->vendor_radiotap_subns
;
395 put_unaligned_le16(status
->vendor_radiotap_len
, pos
);
397 /* align the actual payload as requested */
398 while ((pos
- (u8
*)rthdr
) & (status
->vendor_radiotap_align
- 1))
404 * This function copies a received frame to all monitor interfaces and
405 * returns a cleaned-up SKB that no longer includes the FCS nor the
406 * radiotap header the driver might have added.
408 static struct sk_buff
*
409 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
410 struct ieee80211_rate
*rate
)
412 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
413 struct ieee80211_sub_if_data
*sdata
;
415 struct sk_buff
*skb
, *skb2
;
416 struct net_device
*prev_dev
= NULL
;
417 int present_fcs_len
= 0;
420 * First, we may need to make a copy of the skb because
421 * (1) we need to modify it for radiotap (if not present), and
422 * (2) the other RX handlers will modify the skb we got.
424 * We don't need to, of course, if we aren't going to return
425 * the SKB because it has a bad FCS/PLCP checksum.
428 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
429 present_fcs_len
= FCS_LEN
;
431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432 if (!pskb_may_pull(origskb
, 2 + status
->vendor_radiotap_len
)) {
433 dev_kfree_skb(origskb
);
437 if (!local
->monitors
) {
438 if (should_drop_frame(origskb
, present_fcs_len
)) {
439 dev_kfree_skb(origskb
);
443 return remove_monitor_info(local
, origskb
);
446 /* room for the radiotap header based on driver features */
447 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
449 if (should_drop_frame(origskb
, present_fcs_len
)) {
450 /* only need to expand headroom if necessary */
455 * This shouldn't trigger often because most devices have an
456 * RX header they pull before we get here, and that should
457 * be big enough for our radiotap information. We should
458 * probably export the length to drivers so that we can have
459 * them allocate enough headroom to start with.
461 if (skb_headroom(skb
) < needed_headroom
&&
462 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
468 * Need to make a copy and possibly remove radiotap header
469 * and FCS from the original.
471 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
473 origskb
= remove_monitor_info(local
, origskb
);
479 /* prepend radiotap information */
480 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
483 skb_reset_mac_header(skb
);
484 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
485 skb
->pkt_type
= PACKET_OTHERHOST
;
486 skb
->protocol
= htons(ETH_P_802_2
);
488 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
489 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
492 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
495 if (!ieee80211_sdata_running(sdata
))
499 skb2
= skb_clone(skb
, GFP_ATOMIC
);
501 skb2
->dev
= prev_dev
;
502 netif_receive_skb(skb2
);
506 prev_dev
= sdata
->dev
;
507 sdata
->dev
->stats
.rx_packets
++;
508 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
513 netif_receive_skb(skb
);
520 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
522 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
523 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
524 int tid
, seqno_idx
, security_idx
;
526 /* does the frame have a qos control field? */
527 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
528 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
529 /* frame has qos control */
530 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
531 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
532 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
540 * Sequence numbers for management frames, QoS data
541 * frames with a broadcast/multicast address in the
542 * Address 1 field, and all non-QoS data frames sent
543 * by QoS STAs are assigned using an additional single
544 * modulo-4096 counter, [...]
546 * We also use that counter for non-QoS STAs.
548 seqno_idx
= IEEE80211_NUM_TIDS
;
550 if (ieee80211_is_mgmt(hdr
->frame_control
))
551 security_idx
= IEEE80211_NUM_TIDS
;
555 rx
->seqno_idx
= seqno_idx
;
556 rx
->security_idx
= security_idx
;
557 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558 * For now, set skb->priority to 0 for other cases. */
559 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
563 * DOC: Packet alignment
565 * Drivers always need to pass packets that are aligned to two-byte boundaries
568 * Additionally, should, if possible, align the payload data in a way that
569 * guarantees that the contained IP header is aligned to a four-byte
570 * boundary. In the case of regular frames, this simply means aligning the
571 * payload to a four-byte boundary (because either the IP header is directly
572 * contained, or IV/RFC1042 headers that have a length divisible by four are
573 * in front of it). If the payload data is not properly aligned and the
574 * architecture doesn't support efficient unaligned operations, mac80211
575 * will align the data.
577 * With A-MSDU frames, however, the payload data address must yield two modulo
578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579 * push the IP header further back to a multiple of four again. Thankfully, the
580 * specs were sane enough this time around to require padding each A-MSDU
581 * subframe to a length that is a multiple of four.
583 * Padding like Atheros hardware adds which is between the 802.11 header and
584 * the payload is not supported, the driver is required to move the 802.11
585 * header to be directly in front of the payload in that case.
587 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
591 "unaligned packet at 0x%p\n", rx
->skb
->data
);
598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
600 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
602 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
605 return ieee80211_is_robust_mgmt_frame(hdr
);
609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
611 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
613 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
616 return ieee80211_is_robust_mgmt_frame(hdr
);
620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
623 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
624 struct ieee80211_mmie
*mmie
;
626 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
630 return -1; /* not a robust management frame */
632 mmie
= (struct ieee80211_mmie
*)
633 (skb
->data
+ skb
->len
- sizeof(*mmie
));
634 if (mmie
->element_id
!= WLAN_EID_MMIE
||
635 mmie
->length
!= sizeof(*mmie
) - 2)
638 return le16_to_cpu(mmie
->key_id
);
641 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
643 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
644 char *dev_addr
= rx
->sdata
->vif
.addr
;
646 if (ieee80211_is_data(hdr
->frame_control
)) {
647 if (is_multicast_ether_addr(hdr
->addr1
)) {
648 if (ieee80211_has_tods(hdr
->frame_control
) ||
649 !ieee80211_has_fromds(hdr
->frame_control
))
650 return RX_DROP_MONITOR
;
651 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
652 return RX_DROP_MONITOR
;
654 if (!ieee80211_has_a4(hdr
->frame_control
))
655 return RX_DROP_MONITOR
;
656 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
657 return RX_DROP_MONITOR
;
661 /* If there is not an established peer link and this is not a peer link
662 * establisment frame, beacon or probe, drop the frame.
665 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
666 struct ieee80211_mgmt
*mgmt
;
668 if (!ieee80211_is_mgmt(hdr
->frame_control
))
669 return RX_DROP_MONITOR
;
671 if (ieee80211_is_action(hdr
->frame_control
)) {
674 /* make sure category field is present */
675 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
676 return RX_DROP_MONITOR
;
678 mgmt
= (struct ieee80211_mgmt
*)hdr
;
679 category
= mgmt
->u
.action
.category
;
680 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
681 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
682 return RX_DROP_MONITOR
;
686 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
687 ieee80211_is_probe_resp(hdr
->frame_control
) ||
688 ieee80211_is_beacon(hdr
->frame_control
) ||
689 ieee80211_is_auth(hdr
->frame_control
))
692 return RX_DROP_MONITOR
;
698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
699 struct tid_ampdu_rx
*tid_agg_rx
,
701 struct sk_buff_head
*frames
)
703 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
704 struct ieee80211_rx_status
*status
;
706 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
711 /* release the frame from the reorder ring buffer */
712 tid_agg_rx
->stored_mpdu_num
--;
713 tid_agg_rx
->reorder_buf
[index
] = NULL
;
714 status
= IEEE80211_SKB_RXCB(skb
);
715 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
716 __skb_queue_tail(frames
, skb
);
719 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
723 struct tid_ampdu_rx
*tid_agg_rx
,
725 struct sk_buff_head
*frames
)
729 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
731 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
732 index
= ieee80211_sn_sub(tid_agg_rx
->head_seq_num
,
734 tid_agg_rx
->buf_size
;
735 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
741 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
742 * the skb was added to the buffer longer than this time ago, the earlier
743 * frames that have not yet been received are assumed to be lost and the skb
744 * can be released for processing. This may also release other skb's from the
745 * reorder buffer if there are no additional gaps between the frames.
747 * Callers must hold tid_agg_rx->reorder_lock.
749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
752 struct tid_ampdu_rx
*tid_agg_rx
,
753 struct sk_buff_head
*frames
)
757 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
759 /* release the buffer until next missing frame */
760 index
= ieee80211_sn_sub(tid_agg_rx
->head_seq_num
,
761 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
762 if (!tid_agg_rx
->reorder_buf
[index
] &&
763 tid_agg_rx
->stored_mpdu_num
) {
765 * No buffers ready to be released, but check whether any
766 * frames in the reorder buffer have timed out.
769 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
770 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
771 if (!tid_agg_rx
->reorder_buf
[j
]) {
776 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
777 HT_RX_REORDER_BUF_TIMEOUT
))
778 goto set_release_timer
;
780 ht_dbg_ratelimited(sdata
,
781 "release an RX reorder frame due to timeout on earlier frames\n");
782 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
786 * Increment the head seq# also for the skipped slots.
788 tid_agg_rx
->head_seq_num
=
789 (tid_agg_rx
->head_seq_num
+
790 skipped
) & IEEE80211_SN_MASK
;
793 } else while (tid_agg_rx
->reorder_buf
[index
]) {
794 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
796 index
= ieee80211_sn_sub(tid_agg_rx
->head_seq_num
,
798 tid_agg_rx
->buf_size
;
801 if (tid_agg_rx
->stored_mpdu_num
) {
802 j
= index
= ieee80211_sn_sub(tid_agg_rx
->head_seq_num
,
804 tid_agg_rx
->buf_size
;
806 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
807 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
808 if (tid_agg_rx
->reorder_buf
[j
])
814 mod_timer(&tid_agg_rx
->reorder_timer
,
815 tid_agg_rx
->reorder_time
[j
] + 1 +
816 HT_RX_REORDER_BUF_TIMEOUT
);
818 del_timer(&tid_agg_rx
->reorder_timer
);
823 * As this function belongs to the RX path it must be under
824 * rcu_read_lock protection. It returns false if the frame
825 * can be processed immediately, true if it was consumed.
827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
828 struct tid_ampdu_rx
*tid_agg_rx
,
830 struct sk_buff_head
*frames
)
832 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
833 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
834 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
835 u16 head_seq_num
, buf_size
;
839 spin_lock(&tid_agg_rx
->reorder_lock
);
841 buf_size
= tid_agg_rx
->buf_size
;
842 head_seq_num
= tid_agg_rx
->head_seq_num
;
844 /* frame with out of date sequence number */
845 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
851 * If frame the sequence number exceeds our buffering window
852 * size release some previous frames to make room for this one.
854 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
855 head_seq_num
= ieee80211_sn_inc(
856 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
857 /* release stored frames up to new head to stack */
858 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
859 head_seq_num
, frames
);
862 /* Now the new frame is always in the range of the reordering buffer */
864 index
= ieee80211_sn_sub(mpdu_seq_num
,
865 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
867 /* check if we already stored this frame */
868 if (tid_agg_rx
->reorder_buf
[index
]) {
874 * If the current MPDU is in the right order and nothing else
875 * is stored we can process it directly, no need to buffer it.
876 * If it is first but there's something stored, we may be able
877 * to release frames after this one.
879 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
880 tid_agg_rx
->stored_mpdu_num
== 0) {
881 tid_agg_rx
->head_seq_num
=
882 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
887 /* put the frame in the reordering buffer */
888 tid_agg_rx
->reorder_buf
[index
] = skb
;
889 tid_agg_rx
->reorder_time
[index
] = jiffies
;
890 tid_agg_rx
->stored_mpdu_num
++;
891 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
894 spin_unlock(&tid_agg_rx
->reorder_lock
);
899 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
900 * true if the MPDU was buffered, false if it should be processed.
902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
903 struct sk_buff_head
*frames
)
905 struct sk_buff
*skb
= rx
->skb
;
906 struct ieee80211_local
*local
= rx
->local
;
907 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
908 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
909 struct sta_info
*sta
= rx
->sta
;
910 struct tid_ampdu_rx
*tid_agg_rx
;
914 if (!ieee80211_is_data_qos(hdr
->frame_control
))
918 * filter the QoS data rx stream according to
919 * STA/TID and check if this STA/TID is on aggregation
925 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
926 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
927 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
929 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
933 /* qos null data frames are excluded */
934 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
937 /* not part of a BA session */
938 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
939 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
942 /* not actually part of this BA session */
943 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
946 /* new, potentially un-ordered, ampdu frame - process it */
948 /* reset session timer */
949 if (tid_agg_rx
->timeout
)
950 tid_agg_rx
->last_rx
= jiffies
;
952 /* if this mpdu is fragmented - terminate rx aggregation session */
953 sc
= le16_to_cpu(hdr
->seq_ctrl
);
954 if (sc
& IEEE80211_SCTL_FRAG
) {
955 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
956 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
957 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
962 * No locking needed -- we will only ever process one
963 * RX packet at a time, and thus own tid_agg_rx. All
964 * other code manipulating it needs to (and does) make
965 * sure that we cannot get to it any more before doing
968 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
973 __skb_queue_tail(frames
, skb
);
976 static ieee80211_rx_result debug_noinline
977 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
979 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
980 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
983 * Drop duplicate 802.11 retransmissions
984 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
986 if (rx
->skb
->len
>= 24 && rx
->sta
&&
987 !ieee80211_is_ctl(hdr
->frame_control
) &&
988 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
989 !is_multicast_ether_addr(hdr
->addr1
)) {
990 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
991 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
993 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
994 rx
->local
->dot11FrameDuplicateCount
++;
995 rx
->sta
->num_duplicates
++;
997 return RX_DROP_UNUSABLE
;
999 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1002 if (unlikely(rx
->skb
->len
< 16)) {
1003 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
1004 return RX_DROP_MONITOR
;
1007 /* Drop disallowed frame classes based on STA auth/assoc state;
1008 * IEEE 802.11, Chap 5.5.
1010 * mac80211 filters only based on association state, i.e. it drops
1011 * Class 3 frames from not associated stations. hostapd sends
1012 * deauth/disassoc frames when needed. In addition, hostapd is
1013 * responsible for filtering on both auth and assoc states.
1016 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1017 return ieee80211_rx_mesh_check(rx
);
1019 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1020 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1021 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1022 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1023 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1025 * accept port control frames from the AP even when it's not
1026 * yet marked ASSOC to prevent a race where we don't set the
1027 * assoc bit quickly enough before it sends the first frame
1029 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1030 ieee80211_is_data_present(hdr
->frame_control
)) {
1031 unsigned int hdrlen
;
1034 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1036 if (rx
->skb
->len
< hdrlen
+ 8)
1037 return RX_DROP_MONITOR
;
1039 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1040 if (ethertype
== rx
->sdata
->control_port_protocol
)
1044 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1045 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1048 return RX_DROP_UNUSABLE
;
1050 return RX_DROP_MONITOR
;
1057 static ieee80211_rx_result debug_noinline
1058 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1060 struct ieee80211_local
*local
;
1061 struct ieee80211_hdr
*hdr
;
1062 struct sk_buff
*skb
;
1066 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1068 if (!local
->pspolling
)
1071 if (!ieee80211_has_fromds(hdr
->frame_control
))
1072 /* this is not from AP */
1075 if (!ieee80211_is_data(hdr
->frame_control
))
1078 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1079 /* AP has no more frames buffered for us */
1080 local
->pspolling
= false;
1084 /* more data bit is set, let's request a new frame from the AP */
1085 ieee80211_send_pspoll(local
, rx
->sdata
);
1090 static void sta_ps_start(struct sta_info
*sta
)
1092 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1093 struct ieee80211_local
*local
= sdata
->local
;
1096 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1097 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1098 ps
= &sdata
->bss
->ps
;
1102 atomic_inc(&ps
->num_sta_ps
);
1103 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1104 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1105 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1106 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1107 sta
->sta
.addr
, sta
->sta
.aid
);
1110 static void sta_ps_end(struct sta_info
*sta
)
1112 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1113 sta
->sta
.addr
, sta
->sta
.aid
);
1115 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1116 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1117 sta
->sta
.addr
, sta
->sta
.aid
);
1121 ieee80211_sta_ps_deliver_wakeup(sta
);
1124 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1126 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1129 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1131 /* Don't let the same PS state be set twice */
1132 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1133 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1137 sta_ps_start(sta_inf
);
1139 sta_ps_end(sta_inf
);
1143 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1145 static ieee80211_rx_result debug_noinline
1146 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1148 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1149 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1150 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1153 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1156 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1157 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1161 * The device handles station powersave, so don't do anything about
1162 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1163 * it to mac80211 since they're handled.)
1165 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1169 * Don't do anything if the station isn't already asleep. In
1170 * the uAPSD case, the station will probably be marked asleep,
1171 * in the PS-Poll case the station must be confused ...
1173 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1176 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1177 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1178 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1179 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1181 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1184 /* Free PS Poll skb here instead of returning RX_DROP that would
1185 * count as an dropped frame. */
1186 dev_kfree_skb(rx
->skb
);
1189 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1190 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1191 ieee80211_has_pm(hdr
->frame_control
) &&
1192 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1193 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1194 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1195 ac
= ieee802_1d_to_ac
[tid
& 7];
1198 * If this AC is not trigger-enabled do nothing.
1200 * NB: This could/should check a separate bitmap of trigger-
1201 * enabled queues, but for now we only implement uAPSD w/o
1202 * TSPEC changes to the ACs, so they're always the same.
1204 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1207 /* if we are in a service period, do nothing */
1208 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1211 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1212 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1214 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1220 static ieee80211_rx_result debug_noinline
1221 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1223 struct sta_info
*sta
= rx
->sta
;
1224 struct sk_buff
*skb
= rx
->skb
;
1225 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1226 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1233 * Update last_rx only for IBSS packets which are for the current
1234 * BSSID and for station already AUTHORIZED to avoid keeping the
1235 * current IBSS network alive in cases where other STAs start
1236 * using different BSSID. This will also give the station another
1237 * chance to restart the authentication/authorization in case
1238 * something went wrong the first time.
1240 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1241 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1242 NL80211_IFTYPE_ADHOC
);
1243 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1244 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1245 sta
->last_rx
= jiffies
;
1246 if (ieee80211_is_data(hdr
->frame_control
)) {
1247 sta
->last_rx_rate_idx
= status
->rate_idx
;
1248 sta
->last_rx_rate_flag
= status
->flag
;
1249 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1252 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1254 * Mesh beacons will update last_rx when if they are found to
1255 * match the current local configuration when processed.
1257 sta
->last_rx
= jiffies
;
1258 if (ieee80211_is_data(hdr
->frame_control
)) {
1259 sta
->last_rx_rate_idx
= status
->rate_idx
;
1260 sta
->last_rx_rate_flag
= status
->flag
;
1261 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1265 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1268 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1269 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1271 sta
->rx_fragments
++;
1272 sta
->rx_bytes
+= rx
->skb
->len
;
1273 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1274 sta
->last_signal
= status
->signal
;
1275 ewma_add(&sta
->avg_signal
, -status
->signal
);
1278 if (status
->chains
) {
1279 sta
->chains
= status
->chains
;
1280 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1281 int signal
= status
->chain_signal
[i
];
1283 if (!(status
->chains
& BIT(i
)))
1286 sta
->chain_signal_last
[i
] = signal
;
1287 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1292 * Change STA power saving mode only at the end of a frame
1293 * exchange sequence.
1295 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1296 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1297 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1298 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1299 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1300 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1302 * Ignore doze->wake transitions that are
1303 * indicated by non-data frames, the standard
1304 * is unclear here, but for example going to
1305 * PS mode and then scanning would cause a
1306 * doze->wake transition for the probe request,
1307 * and that is clearly undesirable.
1309 if (ieee80211_is_data(hdr
->frame_control
) &&
1310 !ieee80211_has_pm(hdr
->frame_control
))
1313 if (ieee80211_has_pm(hdr
->frame_control
))
1318 /* mesh power save support */
1319 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1320 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1323 * Drop (qos-)data::nullfunc frames silently, since they
1324 * are used only to control station power saving mode.
1326 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1327 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1328 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1331 * If we receive a 4-addr nullfunc frame from a STA
1332 * that was not moved to a 4-addr STA vlan yet send
1333 * the event to userspace and for older hostapd drop
1334 * the frame to the monitor interface.
1336 if (ieee80211_has_a4(hdr
->frame_control
) &&
1337 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1338 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1339 !rx
->sdata
->u
.vlan
.sta
))) {
1340 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1341 cfg80211_rx_unexpected_4addr_frame(
1342 rx
->sdata
->dev
, sta
->sta
.addr
,
1344 return RX_DROP_MONITOR
;
1347 * Update counter and free packet here to avoid
1348 * counting this as a dropped packed.
1351 dev_kfree_skb(rx
->skb
);
1356 } /* ieee80211_rx_h_sta_process */
1358 static ieee80211_rx_result debug_noinline
1359 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1361 struct sk_buff
*skb
= rx
->skb
;
1362 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1363 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1366 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1367 struct ieee80211_key
*sta_ptk
= NULL
;
1368 int mmie_keyidx
= -1;
1374 * There are four types of keys:
1375 * - GTK (group keys)
1376 * - IGTK (group keys for management frames)
1377 * - PTK (pairwise keys)
1378 * - STK (station-to-station pairwise keys)
1380 * When selecting a key, we have to distinguish between multicast
1381 * (including broadcast) and unicast frames, the latter can only
1382 * use PTKs and STKs while the former always use GTKs and IGTKs.
1383 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1384 * unicast frames can also use key indices like GTKs. Hence, if we
1385 * don't have a PTK/STK we check the key index for a WEP key.
1387 * Note that in a regular BSS, multicast frames are sent by the
1388 * AP only, associated stations unicast the frame to the AP first
1389 * which then multicasts it on their behalf.
1391 * There is also a slight problem in IBSS mode: GTKs are negotiated
1392 * with each station, that is something we don't currently handle.
1393 * The spec seems to expect that one negotiates the same key with
1394 * every station but there's no such requirement; VLANs could be
1399 * No point in finding a key and decrypting if the frame is neither
1400 * addressed to us nor a multicast frame.
1402 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1405 /* start without a key */
1409 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
1411 fc
= hdr
->frame_control
;
1413 if (!ieee80211_has_protected(fc
))
1414 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1416 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1418 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1419 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1421 /* Skip decryption if the frame is not protected. */
1422 if (!ieee80211_has_protected(fc
))
1424 } else if (mmie_keyidx
>= 0) {
1425 /* Broadcast/multicast robust management frame / BIP */
1426 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1427 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1430 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1431 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1432 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1434 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1436 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1437 } else if (!ieee80211_has_protected(fc
)) {
1439 * The frame was not protected, so skip decryption. However, we
1440 * need to set rx->key if there is a key that could have been
1441 * used so that the frame may be dropped if encryption would
1442 * have been expected.
1444 struct ieee80211_key
*key
= NULL
;
1445 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1448 if (ieee80211_is_mgmt(fc
) &&
1449 is_multicast_ether_addr(hdr
->addr1
) &&
1450 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1454 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1455 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1461 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1462 key
= rcu_dereference(sdata
->keys
[i
]);
1474 * The device doesn't give us the IV so we won't be
1475 * able to look up the key. That's ok though, we
1476 * don't need to decrypt the frame, we just won't
1477 * be able to keep statistics accurate.
1478 * Except for key threshold notifications, should
1479 * we somehow allow the driver to tell us which key
1480 * the hardware used if this flag is set?
1482 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1483 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1486 hdrlen
= ieee80211_hdrlen(fc
);
1488 if (rx
->skb
->len
< 8 + hdrlen
)
1489 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1492 * no need to call ieee80211_wep_get_keyidx,
1493 * it verifies a bunch of things we've done already
1495 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1496 keyidx
= keyid
>> 6;
1498 /* check per-station GTK first, if multicast packet */
1499 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1500 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1502 /* if not found, try default key */
1504 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1507 * RSNA-protected unicast frames should always be
1508 * sent with pairwise or station-to-station keys,
1509 * but for WEP we allow using a key index as well.
1512 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1513 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1514 !is_multicast_ether_addr(hdr
->addr1
))
1520 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1521 return RX_DROP_MONITOR
;
1523 rx
->key
->tx_rx_count
++;
1524 /* TODO: add threshold stuff again */
1526 return RX_DROP_MONITOR
;
1529 switch (rx
->key
->conf
.cipher
) {
1530 case WLAN_CIPHER_SUITE_WEP40
:
1531 case WLAN_CIPHER_SUITE_WEP104
:
1532 result
= ieee80211_crypto_wep_decrypt(rx
);
1534 case WLAN_CIPHER_SUITE_TKIP
:
1535 result
= ieee80211_crypto_tkip_decrypt(rx
);
1537 case WLAN_CIPHER_SUITE_CCMP
:
1538 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1540 case WLAN_CIPHER_SUITE_AES_CMAC
:
1541 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1545 * We can reach here only with HW-only algorithms
1546 * but why didn't it decrypt the frame?!
1548 return RX_DROP_UNUSABLE
;
1551 /* the hdr variable is invalid after the decrypt handlers */
1553 /* either the frame has been decrypted or will be dropped */
1554 status
->flag
|= RX_FLAG_DECRYPTED
;
1559 static inline struct ieee80211_fragment_entry
*
1560 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1561 unsigned int frag
, unsigned int seq
, int rx_queue
,
1562 struct sk_buff
**skb
)
1564 struct ieee80211_fragment_entry
*entry
;
1566 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1567 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1568 sdata
->fragment_next
= 0;
1570 if (!skb_queue_empty(&entry
->skb_list
))
1571 __skb_queue_purge(&entry
->skb_list
);
1573 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1575 entry
->first_frag_time
= jiffies
;
1577 entry
->rx_queue
= rx_queue
;
1578 entry
->last_frag
= frag
;
1580 entry
->extra_len
= 0;
1585 static inline struct ieee80211_fragment_entry
*
1586 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1587 unsigned int frag
, unsigned int seq
,
1588 int rx_queue
, struct ieee80211_hdr
*hdr
)
1590 struct ieee80211_fragment_entry
*entry
;
1593 idx
= sdata
->fragment_next
;
1594 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1595 struct ieee80211_hdr
*f_hdr
;
1599 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1601 entry
= &sdata
->fragments
[idx
];
1602 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1603 entry
->rx_queue
!= rx_queue
||
1604 entry
->last_frag
+ 1 != frag
)
1607 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1610 * Check ftype and addresses are equal, else check next fragment
1612 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1613 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1614 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1615 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1618 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1619 __skb_queue_purge(&entry
->skb_list
);
1628 static ieee80211_rx_result debug_noinline
1629 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1631 struct ieee80211_hdr
*hdr
;
1634 unsigned int frag
, seq
;
1635 struct ieee80211_fragment_entry
*entry
;
1636 struct sk_buff
*skb
;
1637 struct ieee80211_rx_status
*status
;
1639 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1640 fc
= hdr
->frame_control
;
1642 if (ieee80211_is_ctl(fc
))
1645 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1646 frag
= sc
& IEEE80211_SCTL_FRAG
;
1648 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1649 is_multicast_ether_addr(hdr
->addr1
))) {
1650 /* not fragmented */
1653 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1655 if (skb_linearize(rx
->skb
))
1656 return RX_DROP_UNUSABLE
;
1659 * skb_linearize() might change the skb->data and
1660 * previously cached variables (in this case, hdr) need to
1661 * be refreshed with the new data.
1663 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1664 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1667 /* This is the first fragment of a new frame. */
1668 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1669 rx
->seqno_idx
, &(rx
->skb
));
1670 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1671 ieee80211_has_protected(fc
)) {
1672 int queue
= rx
->security_idx
;
1673 /* Store CCMP PN so that we can verify that the next
1674 * fragment has a sequential PN value. */
1676 memcpy(entry
->last_pn
,
1677 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1678 IEEE80211_CCMP_PN_LEN
);
1683 /* This is a fragment for a frame that should already be pending in
1684 * fragment cache. Add this fragment to the end of the pending entry.
1686 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1687 rx
->seqno_idx
, hdr
);
1689 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1690 return RX_DROP_MONITOR
;
1693 /* Verify that MPDUs within one MSDU have sequential PN values.
1694 * (IEEE 802.11i, 8.3.3.4.5) */
1697 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1699 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1700 return RX_DROP_UNUSABLE
;
1701 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1702 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1707 queue
= rx
->security_idx
;
1708 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1709 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1710 return RX_DROP_UNUSABLE
;
1711 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1714 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1715 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1716 entry
->last_frag
= frag
;
1717 entry
->extra_len
+= rx
->skb
->len
;
1718 if (ieee80211_has_morefrags(fc
)) {
1723 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1724 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1725 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1726 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1728 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1729 __skb_queue_purge(&entry
->skb_list
);
1730 return RX_DROP_UNUSABLE
;
1733 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1734 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1738 /* Complete frame has been reassembled - process it now */
1739 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1740 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1744 rx
->sta
->rx_packets
++;
1745 if (is_multicast_ether_addr(hdr
->addr1
))
1746 rx
->local
->dot11MulticastReceivedFrameCount
++;
1748 ieee80211_led_rx(rx
->local
);
1752 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1754 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1760 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1762 struct sk_buff
*skb
= rx
->skb
;
1763 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1766 * Pass through unencrypted frames if the hardware has
1767 * decrypted them already.
1769 if (status
->flag
& RX_FLAG_DECRYPTED
)
1772 /* Drop unencrypted frames if key is set. */
1773 if (unlikely(!ieee80211_has_protected(fc
) &&
1774 !ieee80211_is_nullfunc(fc
) &&
1775 ieee80211_is_data(fc
) &&
1776 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1782 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1784 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1785 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1786 __le16 fc
= hdr
->frame_control
;
1789 * Pass through unencrypted frames if the hardware has
1790 * decrypted them already.
1792 if (status
->flag
& RX_FLAG_DECRYPTED
)
1795 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1796 if (unlikely(!ieee80211_has_protected(fc
) &&
1797 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1799 if (ieee80211_is_deauth(fc
) ||
1800 ieee80211_is_disassoc(fc
))
1801 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1806 /* BIP does not use Protected field, so need to check MMIE */
1807 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1808 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1809 if (ieee80211_is_deauth(fc
) ||
1810 ieee80211_is_disassoc(fc
))
1811 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1817 * When using MFP, Action frames are not allowed prior to
1818 * having configured keys.
1820 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1821 ieee80211_is_robust_mgmt_frame(
1822 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1830 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1832 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1833 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1834 bool check_port_control
= false;
1835 struct ethhdr
*ehdr
;
1838 *port_control
= false;
1839 if (ieee80211_has_a4(hdr
->frame_control
) &&
1840 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1843 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1844 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1846 if (!sdata
->u
.mgd
.use_4addr
)
1849 check_port_control
= true;
1852 if (is_multicast_ether_addr(hdr
->addr1
) &&
1853 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1856 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1860 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1861 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1862 *port_control
= true;
1863 else if (check_port_control
)
1870 * requires that rx->skb is a frame with ethernet header
1872 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1874 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1875 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1876 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1879 * Allow EAPOL frames to us/the PAE group address regardless
1880 * of whether the frame was encrypted or not.
1882 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1883 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1884 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1887 if (ieee80211_802_1x_port_control(rx
) ||
1888 ieee80211_drop_unencrypted(rx
, fc
))
1895 * requires that rx->skb is a frame with ethernet header
1898 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1900 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1901 struct net_device
*dev
= sdata
->dev
;
1902 struct sk_buff
*skb
, *xmit_skb
;
1903 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1904 struct sta_info
*dsta
;
1905 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1910 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1911 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1912 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1913 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1914 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1915 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1917 * send multicast frames both to higher layers in
1918 * local net stack and back to the wireless medium
1920 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1922 net_info_ratelimited("%s: failed to clone multicast frame\n",
1925 dsta
= sta_info_get(sdata
, skb
->data
);
1928 * The destination station is associated to
1929 * this AP (in this VLAN), so send the frame
1930 * directly to it and do not pass it to local
1940 int align __maybe_unused
;
1942 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1944 * 'align' will only take the values 0 or 2 here
1945 * since all frames are required to be aligned
1946 * to 2-byte boundaries when being passed to
1947 * mac80211; the code here works just as well if
1948 * that isn't true, but mac80211 assumes it can
1949 * access fields as 2-byte aligned (e.g. for
1950 * compare_ether_addr)
1952 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1954 if (WARN_ON(skb_headroom(skb
) < 3)) {
1958 u8
*data
= skb
->data
;
1959 size_t len
= skb_headlen(skb
);
1961 memmove(skb
->data
, data
, len
);
1962 skb_set_tail_pointer(skb
, len
);
1968 /* deliver to local stack */
1969 skb
->protocol
= eth_type_trans(skb
, dev
);
1970 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1971 netif_receive_skb(skb
);
1977 * Send to wireless media and increase priority by 256 to
1978 * keep the received priority instead of reclassifying
1979 * the frame (see cfg80211_classify8021d).
1981 xmit_skb
->priority
+= 256;
1982 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1983 skb_reset_network_header(xmit_skb
);
1984 skb_reset_mac_header(xmit_skb
);
1985 dev_queue_xmit(xmit_skb
);
1989 static ieee80211_rx_result debug_noinline
1990 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1992 struct net_device
*dev
= rx
->sdata
->dev
;
1993 struct sk_buff
*skb
= rx
->skb
;
1994 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1995 __le16 fc
= hdr
->frame_control
;
1996 struct sk_buff_head frame_list
;
1997 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1999 if (unlikely(!ieee80211_is_data(fc
)))
2002 if (unlikely(!ieee80211_is_data_present(fc
)))
2003 return RX_DROP_MONITOR
;
2005 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2008 if (ieee80211_has_a4(hdr
->frame_control
) &&
2009 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2010 !rx
->sdata
->u
.vlan
.sta
)
2011 return RX_DROP_UNUSABLE
;
2013 if (is_multicast_ether_addr(hdr
->addr1
) &&
2014 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2015 rx
->sdata
->u
.vlan
.sta
) ||
2016 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2017 rx
->sdata
->u
.mgd
.use_4addr
)))
2018 return RX_DROP_UNUSABLE
;
2021 __skb_queue_head_init(&frame_list
);
2023 if (skb_linearize(skb
))
2024 return RX_DROP_UNUSABLE
;
2026 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2027 rx
->sdata
->vif
.type
,
2028 rx
->local
->hw
.extra_tx_headroom
, true);
2030 while (!skb_queue_empty(&frame_list
)) {
2031 rx
->skb
= __skb_dequeue(&frame_list
);
2033 if (!ieee80211_frame_allowed(rx
, fc
)) {
2034 dev_kfree_skb(rx
->skb
);
2037 dev
->stats
.rx_packets
++;
2038 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2040 ieee80211_deliver_skb(rx
);
2046 #ifdef CONFIG_MAC80211_MESH
2047 static ieee80211_rx_result
2048 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2050 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2051 struct ieee80211_tx_info
*info
;
2052 struct ieee80211s_hdr
*mesh_hdr
;
2053 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2054 struct ieee80211_local
*local
= rx
->local
;
2055 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2056 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2057 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2058 __le16 reason
= cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD
);
2061 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2062 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2064 /* make sure fixed part of mesh header is there, also checks skb len */
2065 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2066 return RX_DROP_MONITOR
;
2068 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2070 /* make sure full mesh header is there, also checks skb len */
2071 if (!pskb_may_pull(rx
->skb
,
2072 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2073 return RX_DROP_MONITOR
;
2075 /* reload pointers */
2076 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2077 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2079 /* frame is in RMC, don't forward */
2080 if (ieee80211_is_data(hdr
->frame_control
) &&
2081 is_multicast_ether_addr(hdr
->addr1
) &&
2082 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2083 return RX_DROP_MONITOR
;
2085 if (!ieee80211_is_data(hdr
->frame_control
) ||
2086 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2090 return RX_DROP_MONITOR
;
2092 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2093 struct mesh_path
*mppath
;
2097 if (is_multicast_ether_addr(hdr
->addr1
)) {
2098 mpp_addr
= hdr
->addr3
;
2099 proxied_addr
= mesh_hdr
->eaddr1
;
2100 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2101 /* has_a4 already checked in ieee80211_rx_mesh_check */
2102 mpp_addr
= hdr
->addr4
;
2103 proxied_addr
= mesh_hdr
->eaddr2
;
2105 return RX_DROP_MONITOR
;
2109 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2111 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2113 spin_lock_bh(&mppath
->state_lock
);
2114 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2115 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2116 spin_unlock_bh(&mppath
->state_lock
);
2121 /* Frame has reached destination. Don't forward */
2122 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2123 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2126 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2127 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2128 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2129 return RX_DROP_MONITOR
;
2131 skb_set_queue_mapping(skb
, q
);
2133 if (!--mesh_hdr
->ttl
) {
2134 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2138 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2141 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2143 net_info_ratelimited("%s: failed to clone mesh frame\n",
2148 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2149 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2150 info
= IEEE80211_SKB_CB(fwd_skb
);
2151 memset(info
, 0, sizeof(*info
));
2152 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2153 info
->control
.vif
= &rx
->sdata
->vif
;
2154 info
->control
.jiffies
= jiffies
;
2155 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2156 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2157 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2158 /* update power mode indication when forwarding */
2159 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2160 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2161 /* mesh power mode flags updated in mesh_nexthop_lookup */
2162 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2164 /* unable to resolve next hop */
2165 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2166 fwd_hdr
->addr3
, 0, reason
, fwd_hdr
->addr2
);
2167 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2169 return RX_DROP_MONITOR
;
2172 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2173 ieee80211_add_pending_skb(local
, fwd_skb
);
2175 if (is_multicast_ether_addr(hdr
->addr1
) ||
2176 sdata
->dev
->flags
& IFF_PROMISC
)
2179 return RX_DROP_MONITOR
;
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2186 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2187 struct ieee80211_local
*local
= rx
->local
;
2188 struct net_device
*dev
= sdata
->dev
;
2189 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2190 __le16 fc
= hdr
->frame_control
;
2194 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2197 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2198 return RX_DROP_MONITOR
;
2201 * Send unexpected-4addr-frame event to hostapd. For older versions,
2202 * also drop the frame to cooked monitor interfaces.
2204 if (ieee80211_has_a4(hdr
->frame_control
) &&
2205 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2207 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2208 cfg80211_rx_unexpected_4addr_frame(
2209 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2210 return RX_DROP_MONITOR
;
2213 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2215 return RX_DROP_UNUSABLE
;
2217 if (!ieee80211_frame_allowed(rx
, fc
))
2218 return RX_DROP_MONITOR
;
2220 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2221 unlikely(port_control
) && sdata
->bss
) {
2222 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2230 dev
->stats
.rx_packets
++;
2231 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2233 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2234 !is_multicast_ether_addr(
2235 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2236 (!local
->scanning
&&
2237 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2238 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2239 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2242 ieee80211_deliver_skb(rx
);
2247 static ieee80211_rx_result debug_noinline
2248 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2250 struct sk_buff
*skb
= rx
->skb
;
2251 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2252 struct tid_ampdu_rx
*tid_agg_rx
;
2256 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2259 if (ieee80211_is_back_req(bar
->frame_control
)) {
2261 __le16 control
, start_seq_num
;
2262 } __packed bar_data
;
2265 return RX_DROP_MONITOR
;
2267 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2268 &bar_data
, sizeof(bar_data
)))
2269 return RX_DROP_MONITOR
;
2271 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2273 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2275 return RX_DROP_MONITOR
;
2277 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2279 /* reset session timer */
2280 if (tid_agg_rx
->timeout
)
2281 mod_timer(&tid_agg_rx
->session_timer
,
2282 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2284 spin_lock(&tid_agg_rx
->reorder_lock
);
2285 /* release stored frames up to start of BAR */
2286 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2287 start_seq_num
, frames
);
2288 spin_unlock(&tid_agg_rx
->reorder_lock
);
2295 * After this point, we only want management frames,
2296 * so we can drop all remaining control frames to
2297 * cooked monitor interfaces.
2299 return RX_DROP_MONITOR
;
2302 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2303 struct ieee80211_mgmt
*mgmt
,
2306 struct ieee80211_local
*local
= sdata
->local
;
2307 struct sk_buff
*skb
;
2308 struct ieee80211_mgmt
*resp
;
2310 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2311 /* Not to own unicast address */
2315 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2316 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2317 /* Not from the current AP or not associated yet. */
2321 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2322 /* Too short SA Query request frame */
2326 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2330 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2331 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2332 memset(resp
, 0, 24);
2333 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2334 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2335 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2336 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2337 IEEE80211_STYPE_ACTION
);
2338 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2339 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2340 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2341 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2342 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2343 WLAN_SA_QUERY_TR_ID_LEN
);
2345 ieee80211_tx_skb(sdata
, skb
);
2348 static ieee80211_rx_result debug_noinline
2349 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2351 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2352 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2355 * From here on, look only at management frames.
2356 * Data and control frames are already handled,
2357 * and unknown (reserved) frames are useless.
2359 if (rx
->skb
->len
< 24)
2360 return RX_DROP_MONITOR
;
2362 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2363 return RX_DROP_MONITOR
;
2365 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2366 ieee80211_is_beacon(mgmt
->frame_control
) &&
2367 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2370 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2371 sig
= status
->signal
;
2373 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2374 rx
->skb
->data
, rx
->skb
->len
,
2376 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2379 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2380 return RX_DROP_MONITOR
;
2382 if (ieee80211_drop_unencrypted_mgmt(rx
))
2383 return RX_DROP_UNUSABLE
;
2388 static ieee80211_rx_result debug_noinline
2389 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2391 struct ieee80211_local
*local
= rx
->local
;
2392 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2393 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2394 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2395 int len
= rx
->skb
->len
;
2397 if (!ieee80211_is_action(mgmt
->frame_control
))
2400 /* drop too small frames */
2401 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2402 return RX_DROP_UNUSABLE
;
2404 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2405 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
)
2406 return RX_DROP_UNUSABLE
;
2408 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2409 return RX_DROP_UNUSABLE
;
2411 switch (mgmt
->u
.action
.category
) {
2412 case WLAN_CATEGORY_HT
:
2413 /* reject HT action frames from stations not supporting HT */
2414 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2417 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2418 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2419 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2420 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2421 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2424 /* verify action & smps_control/chanwidth are present */
2425 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2428 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2429 case WLAN_HT_ACTION_SMPS
: {
2430 struct ieee80211_supported_band
*sband
;
2431 enum ieee80211_smps_mode smps_mode
;
2433 /* convert to HT capability */
2434 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2435 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2436 smps_mode
= IEEE80211_SMPS_OFF
;
2438 case WLAN_HT_SMPS_CONTROL_STATIC
:
2439 smps_mode
= IEEE80211_SMPS_STATIC
;
2441 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2442 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2448 /* if no change do nothing */
2449 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2451 rx
->sta
->sta
.smps_mode
= smps_mode
;
2453 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2455 rate_control_rate_update(local
, sband
, rx
->sta
,
2456 IEEE80211_RC_SMPS_CHANGED
);
2459 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2460 struct ieee80211_supported_band
*sband
;
2461 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2462 enum ieee80211_sta_rx_bandwidth new_bw
;
2464 /* If it doesn't support 40 MHz it can't change ... */
2465 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2466 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2469 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2470 new_bw
= IEEE80211_STA_RX_BW_20
;
2472 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2474 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2477 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2479 rate_control_rate_update(local
, sband
, rx
->sta
,
2480 IEEE80211_RC_BW_CHANGED
);
2488 case WLAN_CATEGORY_PUBLIC
:
2489 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2491 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2495 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2497 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2498 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2500 if (len
< offsetof(struct ieee80211_mgmt
,
2501 u
.action
.u
.ext_chan_switch
.variable
))
2504 case WLAN_CATEGORY_VHT
:
2505 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2506 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2507 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2508 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2509 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2512 /* verify action code is present */
2513 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2516 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2517 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2520 /* verify opmode is present */
2521 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2524 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2526 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2527 opmode
, status
->band
,
2535 case WLAN_CATEGORY_BACK
:
2536 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2537 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2538 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2539 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2540 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2543 /* verify action_code is present */
2544 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2547 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2548 case WLAN_ACTION_ADDBA_REQ
:
2549 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2550 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2553 case WLAN_ACTION_ADDBA_RESP
:
2554 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2555 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2558 case WLAN_ACTION_DELBA
:
2559 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2560 sizeof(mgmt
->u
.action
.u
.delba
)))
2568 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2569 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2572 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2575 /* verify action_code is present */
2576 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2579 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2580 case WLAN_ACTION_SPCT_MSR_REQ
:
2581 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2582 sizeof(mgmt
->u
.action
.u
.measurement
)))
2584 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2586 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2587 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2590 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2596 case WLAN_CATEGORY_SA_QUERY
:
2597 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2598 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2601 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2602 case WLAN_ACTION_SA_QUERY_REQUEST
:
2603 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2605 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2609 case WLAN_CATEGORY_SELF_PROTECTED
:
2610 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2611 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2614 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2615 case WLAN_SP_MESH_PEERING_OPEN
:
2616 case WLAN_SP_MESH_PEERING_CLOSE
:
2617 case WLAN_SP_MESH_PEERING_CONFIRM
:
2618 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2620 if (sdata
->u
.mesh
.user_mpm
)
2621 /* userspace handles this frame */
2624 case WLAN_SP_MGK_INFORM
:
2625 case WLAN_SP_MGK_ACK
:
2626 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2631 case WLAN_CATEGORY_MESH_ACTION
:
2632 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2633 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2636 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2638 if (mesh_action_is_path_sel(mgmt
) &&
2639 !mesh_path_sel_is_hwmp(sdata
))
2647 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2648 /* will return in the next handlers */
2653 rx
->sta
->rx_packets
++;
2654 dev_kfree_skb(rx
->skb
);
2658 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2659 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2660 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2662 rx
->sta
->rx_packets
++;
2666 static ieee80211_rx_result debug_noinline
2667 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2669 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2672 /* skip known-bad action frames and return them in the next handler */
2673 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2677 * Getting here means the kernel doesn't know how to handle
2678 * it, but maybe userspace does ... include returned frames
2679 * so userspace can register for those to know whether ones
2680 * it transmitted were processed or returned.
2683 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2684 sig
= status
->signal
;
2686 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2687 rx
->skb
->data
, rx
->skb
->len
, 0, GFP_ATOMIC
)) {
2689 rx
->sta
->rx_packets
++;
2690 dev_kfree_skb(rx
->skb
);
2697 static ieee80211_rx_result debug_noinline
2698 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2700 struct ieee80211_local
*local
= rx
->local
;
2701 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2702 struct sk_buff
*nskb
;
2703 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2704 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2706 if (!ieee80211_is_action(mgmt
->frame_control
))
2710 * For AP mode, hostapd is responsible for handling any action
2711 * frames that we didn't handle, including returning unknown
2712 * ones. For all other modes we will return them to the sender,
2713 * setting the 0x80 bit in the action category, as required by
2714 * 802.11-2012 9.24.4.
2715 * Newer versions of hostapd shall also use the management frame
2716 * registration mechanisms, but older ones still use cooked
2717 * monitor interfaces so push all frames there.
2719 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2720 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2721 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2722 return RX_DROP_MONITOR
;
2724 if (is_multicast_ether_addr(mgmt
->da
))
2725 return RX_DROP_MONITOR
;
2727 /* do not return rejected action frames */
2728 if (mgmt
->u
.action
.category
& 0x80)
2729 return RX_DROP_UNUSABLE
;
2731 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2734 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2736 nmgmt
->u
.action
.category
|= 0x80;
2737 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2738 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2740 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2742 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2743 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2745 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2746 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2747 IEEE80211_TX_CTL_NO_CCK_RATE
;
2748 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2750 local
->hw
.offchannel_tx_hw_queue
;
2753 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2756 dev_kfree_skb(rx
->skb
);
2760 static ieee80211_rx_result debug_noinline
2761 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2763 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2764 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2767 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2769 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2770 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2771 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2772 return RX_DROP_MONITOR
;
2775 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2776 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2777 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2778 /* process for all: mesh, mlme, ibss */
2780 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2781 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2782 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2783 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2784 if (is_multicast_ether_addr(mgmt
->da
) &&
2785 !is_broadcast_ether_addr(mgmt
->da
))
2786 return RX_DROP_MONITOR
;
2788 /* process only for station */
2789 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2790 return RX_DROP_MONITOR
;
2792 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2793 /* process only for ibss and mesh */
2794 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2795 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2796 return RX_DROP_MONITOR
;
2799 return RX_DROP_MONITOR
;
2802 /* queue up frame and kick off work to process it */
2803 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2804 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2805 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2807 rx
->sta
->rx_packets
++;
2812 /* TODO: use IEEE80211_RX_FRAGMENTED */
2813 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2814 struct ieee80211_rate
*rate
)
2816 struct ieee80211_sub_if_data
*sdata
;
2817 struct ieee80211_local
*local
= rx
->local
;
2818 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2819 struct net_device
*prev_dev
= NULL
;
2820 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2821 int needed_headroom
;
2824 * If cooked monitor has been processed already, then
2825 * don't do it again. If not, set the flag.
2827 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2829 rx
->flags
|= IEEE80211_RX_CMNTR
;
2831 /* If there are no cooked monitor interfaces, just free the SKB */
2832 if (!local
->cooked_mntrs
)
2835 /* room for the radiotap header based on driver features */
2836 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
2838 if (skb_headroom(skb
) < needed_headroom
&&
2839 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2842 /* prepend radiotap information */
2843 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2846 skb_set_mac_header(skb
, 0);
2847 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2848 skb
->pkt_type
= PACKET_OTHERHOST
;
2849 skb
->protocol
= htons(ETH_P_802_2
);
2851 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2852 if (!ieee80211_sdata_running(sdata
))
2855 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2856 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2860 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2862 skb2
->dev
= prev_dev
;
2863 netif_receive_skb(skb2
);
2867 prev_dev
= sdata
->dev
;
2868 sdata
->dev
->stats
.rx_packets
++;
2869 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2873 skb
->dev
= prev_dev
;
2874 netif_receive_skb(skb
);
2882 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2883 ieee80211_rx_result res
)
2886 case RX_DROP_MONITOR
:
2887 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2889 rx
->sta
->rx_dropped
++;
2892 struct ieee80211_rate
*rate
= NULL
;
2893 struct ieee80211_supported_band
*sband
;
2894 struct ieee80211_rx_status
*status
;
2896 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2898 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2899 if (!(status
->flag
& RX_FLAG_HT
) &&
2900 !(status
->flag
& RX_FLAG_VHT
))
2901 rate
= &sband
->bitrates
[status
->rate_idx
];
2903 ieee80211_rx_cooked_monitor(rx
, rate
);
2906 case RX_DROP_UNUSABLE
:
2907 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2909 rx
->sta
->rx_dropped
++;
2910 dev_kfree_skb(rx
->skb
);
2913 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2918 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2919 struct sk_buff_head
*frames
)
2921 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2922 struct sk_buff
*skb
;
2924 #define CALL_RXH(rxh) \
2927 if (res != RX_CONTINUE) \
2931 spin_lock_bh(&rx
->local
->rx_path_lock
);
2933 while ((skb
= __skb_dequeue(frames
))) {
2935 * all the other fields are valid across frames
2936 * that belong to an aMPDU since they are on the
2937 * same TID from the same station
2941 CALL_RXH(ieee80211_rx_h_check_more_data
)
2942 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2943 CALL_RXH(ieee80211_rx_h_sta_process
)
2944 CALL_RXH(ieee80211_rx_h_decrypt
)
2945 CALL_RXH(ieee80211_rx_h_defragment
)
2946 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2947 /* must be after MMIC verify so header is counted in MPDU mic */
2948 #ifdef CONFIG_MAC80211_MESH
2949 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2950 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2952 CALL_RXH(ieee80211_rx_h_amsdu
)
2953 CALL_RXH(ieee80211_rx_h_data
)
2955 /* special treatment -- needs the queue */
2956 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2957 if (res
!= RX_CONTINUE
)
2960 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2961 CALL_RXH(ieee80211_rx_h_action
)
2962 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2963 CALL_RXH(ieee80211_rx_h_action_return
)
2964 CALL_RXH(ieee80211_rx_h_mgmt
)
2967 ieee80211_rx_handlers_result(rx
, res
);
2972 spin_unlock_bh(&rx
->local
->rx_path_lock
);
2975 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2977 struct sk_buff_head reorder_release
;
2978 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2980 __skb_queue_head_init(&reorder_release
);
2982 #define CALL_RXH(rxh) \
2985 if (res != RX_CONTINUE) \
2989 CALL_RXH(ieee80211_rx_h_check
)
2991 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2993 ieee80211_rx_handlers(rx
, &reorder_release
);
2997 ieee80211_rx_handlers_result(rx
, res
);
3003 * This function makes calls into the RX path, therefore
3004 * it has to be invoked under RCU read lock.
3006 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3008 struct sk_buff_head frames
;
3009 struct ieee80211_rx_data rx
= {
3011 .sdata
= sta
->sdata
,
3012 .local
= sta
->local
,
3013 /* This is OK -- must be QoS data frame */
3014 .security_idx
= tid
,
3018 struct tid_ampdu_rx
*tid_agg_rx
;
3020 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3024 __skb_queue_head_init(&frames
);
3026 spin_lock(&tid_agg_rx
->reorder_lock
);
3027 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3028 spin_unlock(&tid_agg_rx
->reorder_lock
);
3030 ieee80211_rx_handlers(&rx
, &frames
);
3033 /* main receive path */
3035 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3036 struct ieee80211_hdr
*hdr
)
3038 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3039 struct sk_buff
*skb
= rx
->skb
;
3040 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3041 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3042 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3044 switch (sdata
->vif
.type
) {
3045 case NL80211_IFTYPE_STATION
:
3046 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3049 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3050 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3051 sdata
->u
.mgd
.use_4addr
)
3053 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3056 case NL80211_IFTYPE_ADHOC
:
3059 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3060 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3062 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3064 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3066 } else if (!multicast
&&
3067 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3068 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3070 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3071 } else if (!rx
->sta
) {
3073 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3074 rate_idx
= 0; /* TODO: HT/VHT rates */
3076 rate_idx
= status
->rate_idx
;
3077 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3081 case NL80211_IFTYPE_MESH_POINT
:
3083 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3084 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3087 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3090 case NL80211_IFTYPE_AP_VLAN
:
3091 case NL80211_IFTYPE_AP
:
3093 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3095 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3097 * Accept public action frames even when the
3098 * BSSID doesn't match, this is used for P2P
3099 * and location updates. Note that mac80211
3100 * itself never looks at these frames.
3103 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3105 if (ieee80211_is_public_action(hdr
, skb
->len
))
3107 if (!ieee80211_is_beacon(hdr
->frame_control
))
3109 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3112 case NL80211_IFTYPE_WDS
:
3113 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3115 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3118 case NL80211_IFTYPE_P2P_DEVICE
:
3119 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3120 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3121 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3122 !ieee80211_is_beacon(hdr
->frame_control
))
3124 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3126 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3129 /* should never get here */
3138 * This function returns whether or not the SKB
3139 * was destined for RX processing or not, which,
3140 * if consume is true, is equivalent to whether
3141 * or not the skb was consumed.
3143 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3144 struct sk_buff
*skb
, bool consume
)
3146 struct ieee80211_local
*local
= rx
->local
;
3147 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3148 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3149 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3153 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3154 prepares
= prepare_for_handlers(rx
, hdr
);
3160 skb
= skb_copy(skb
, GFP_ATOMIC
);
3162 if (net_ratelimit())
3163 wiphy_debug(local
->hw
.wiphy
,
3164 "failed to copy skb for %s\n",
3172 ieee80211_invoke_rx_handlers(rx
);
3177 * This is the actual Rx frames handler. as it blongs to Rx path it must
3178 * be called with rcu_read_lock protection.
3180 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3181 struct sk_buff
*skb
)
3183 struct ieee80211_local
*local
= hw_to_local(hw
);
3184 struct ieee80211_sub_if_data
*sdata
;
3185 struct ieee80211_hdr
*hdr
;
3187 struct ieee80211_rx_data rx
;
3188 struct ieee80211_sub_if_data
*prev
;
3189 struct sta_info
*sta
, *tmp
, *prev_sta
;
3192 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3193 memset(&rx
, 0, sizeof(rx
));
3197 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3198 local
->dot11ReceivedFragmentCount
++;
3200 if (ieee80211_is_mgmt(fc
)) {
3201 /* drop frame if too short for header */
3202 if (skb
->len
< ieee80211_hdrlen(fc
))
3205 err
= skb_linearize(skb
);
3207 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3215 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3216 ieee80211_parse_qos(&rx
);
3217 ieee80211_verify_alignment(&rx
);
3219 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3220 ieee80211_is_beacon(hdr
->frame_control
)))
3221 ieee80211_scan_rx(local
, skb
);
3223 if (ieee80211_is_data(fc
)) {
3226 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3233 rx
.sdata
= prev_sta
->sdata
;
3234 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3241 rx
.sdata
= prev_sta
->sdata
;
3243 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3251 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3252 if (!ieee80211_sdata_running(sdata
))
3255 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3256 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3260 * frame is destined for this interface, but if it's
3261 * not also for the previous one we handle that after
3262 * the loop to avoid copying the SKB once too much
3270 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3272 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3278 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3281 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3290 * This is the receive path handler. It is called by a low level driver when an
3291 * 802.11 MPDU is received from the hardware.
3293 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3295 struct ieee80211_local
*local
= hw_to_local(hw
);
3296 struct ieee80211_rate
*rate
= NULL
;
3297 struct ieee80211_supported_band
*sband
;
3298 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3300 WARN_ON_ONCE(softirq_count() == 0);
3302 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3305 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3306 if (WARN_ON(!sband
))
3310 * If we're suspending, it is possible although not too likely
3311 * that we'd be receiving frames after having already partially
3312 * quiesced the stack. We can't process such frames then since
3313 * that might, for example, cause stations to be added or other
3314 * driver callbacks be invoked.
3316 if (unlikely(local
->quiescing
|| local
->suspended
))
3319 /* We might be during a HW reconfig, prevent Rx for the same reason */
3320 if (unlikely(local
->in_reconfig
))
3324 * The same happens when we're not even started,
3325 * but that's worth a warning.
3327 if (WARN_ON(!local
->started
))
3330 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3332 * Validate the rate, unless a PLCP error means that
3333 * we probably can't have a valid rate here anyway.
3336 if (status
->flag
& RX_FLAG_HT
) {
3338 * rate_idx is MCS index, which can be [0-76]
3341 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3343 * Anything else would be some sort of driver or
3344 * hardware error. The driver should catch hardware
3347 if (WARN(status
->rate_idx
> 76,
3348 "Rate marked as an HT rate but passed "
3349 "status->rate_idx is not "
3350 "an MCS index [0-76]: %d (0x%02x)\n",
3354 } else if (status
->flag
& RX_FLAG_VHT
) {
3355 if (WARN_ONCE(status
->rate_idx
> 9 ||
3357 status
->vht_nss
> 8,
3358 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3359 status
->rate_idx
, status
->vht_nss
))
3362 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3364 rate
= &sband
->bitrates
[status
->rate_idx
];
3368 status
->rx_flags
= 0;
3371 * key references and virtual interfaces are protected using RCU
3372 * and this requires that we are in a read-side RCU section during
3373 * receive processing
3378 * Frames with failed FCS/PLCP checksum are not returned,
3379 * all other frames are returned without radiotap header
3380 * if it was previously present.
3381 * Also, frames with less than 16 bytes are dropped.
3383 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3389 ieee80211_tpt_led_trig_rx(local
,
3390 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3392 __ieee80211_rx_handle_packet(hw
, skb
);
3400 EXPORT_SYMBOL(ieee80211_rx
);
3402 /* This is a version of the rx handler that can be called from hard irq
3403 * context. Post the skb on the queue and schedule the tasklet */
3404 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3406 struct ieee80211_local
*local
= hw_to_local(hw
);
3408 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3410 skb
->pkt_type
= IEEE80211_RX_MSG
;
3411 skb_queue_tail(&local
->skb_queue
, skb
);
3412 tasklet_schedule(&local
->tasklet
);
3414 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);