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 int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
644 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
649 fc
= hdr
->frame_control
;
650 hdrlen
= ieee80211_hdrlen(fc
);
652 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
655 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
656 keyid
&= cs
->key_idx_mask
;
657 keyid
>>= cs
->key_idx_shift
;
662 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
664 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
665 char *dev_addr
= rx
->sdata
->vif
.addr
;
667 if (ieee80211_is_data(hdr
->frame_control
)) {
668 if (is_multicast_ether_addr(hdr
->addr1
)) {
669 if (ieee80211_has_tods(hdr
->frame_control
) ||
670 !ieee80211_has_fromds(hdr
->frame_control
))
671 return RX_DROP_MONITOR
;
672 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
673 return RX_DROP_MONITOR
;
675 if (!ieee80211_has_a4(hdr
->frame_control
))
676 return RX_DROP_MONITOR
;
677 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
678 return RX_DROP_MONITOR
;
682 /* If there is not an established peer link and this is not a peer link
683 * establisment frame, beacon or probe, drop the frame.
686 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
687 struct ieee80211_mgmt
*mgmt
;
689 if (!ieee80211_is_mgmt(hdr
->frame_control
))
690 return RX_DROP_MONITOR
;
692 if (ieee80211_is_action(hdr
->frame_control
)) {
695 /* make sure category field is present */
696 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
697 return RX_DROP_MONITOR
;
699 mgmt
= (struct ieee80211_mgmt
*)hdr
;
700 category
= mgmt
->u
.action
.category
;
701 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
702 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
703 return RX_DROP_MONITOR
;
707 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
708 ieee80211_is_probe_resp(hdr
->frame_control
) ||
709 ieee80211_is_beacon(hdr
->frame_control
) ||
710 ieee80211_is_auth(hdr
->frame_control
))
713 return RX_DROP_MONITOR
;
719 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
720 struct tid_ampdu_rx
*tid_agg_rx
,
722 struct sk_buff_head
*frames
)
724 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
725 struct ieee80211_rx_status
*status
;
727 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
732 /* release the frame from the reorder ring buffer */
733 tid_agg_rx
->stored_mpdu_num
--;
734 tid_agg_rx
->reorder_buf
[index
] = NULL
;
735 status
= IEEE80211_SKB_RXCB(skb
);
736 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
737 __skb_queue_tail(frames
, skb
);
740 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
743 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
744 struct tid_ampdu_rx
*tid_agg_rx
,
746 struct sk_buff_head
*frames
)
750 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
752 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
753 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
754 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
760 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
761 * the skb was added to the buffer longer than this time ago, the earlier
762 * frames that have not yet been received are assumed to be lost and the skb
763 * can be released for processing. This may also release other skb's from the
764 * reorder buffer if there are no additional gaps between the frames.
766 * Callers must hold tid_agg_rx->reorder_lock.
768 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
770 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
771 struct tid_ampdu_rx
*tid_agg_rx
,
772 struct sk_buff_head
*frames
)
776 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
778 /* release the buffer until next missing frame */
779 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
780 if (!tid_agg_rx
->reorder_buf
[index
] &&
781 tid_agg_rx
->stored_mpdu_num
) {
783 * No buffers ready to be released, but check whether any
784 * frames in the reorder buffer have timed out.
787 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
788 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
789 if (!tid_agg_rx
->reorder_buf
[j
]) {
794 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
795 HT_RX_REORDER_BUF_TIMEOUT
))
796 goto set_release_timer
;
798 ht_dbg_ratelimited(sdata
,
799 "release an RX reorder frame due to timeout on earlier frames\n");
800 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
804 * Increment the head seq# also for the skipped slots.
806 tid_agg_rx
->head_seq_num
=
807 (tid_agg_rx
->head_seq_num
+
808 skipped
) & IEEE80211_SN_MASK
;
811 } else while (tid_agg_rx
->reorder_buf
[index
]) {
812 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
814 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
817 if (tid_agg_rx
->stored_mpdu_num
) {
818 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
820 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
821 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
822 if (tid_agg_rx
->reorder_buf
[j
])
828 mod_timer(&tid_agg_rx
->reorder_timer
,
829 tid_agg_rx
->reorder_time
[j
] + 1 +
830 HT_RX_REORDER_BUF_TIMEOUT
);
832 del_timer(&tid_agg_rx
->reorder_timer
);
837 * As this function belongs to the RX path it must be under
838 * rcu_read_lock protection. It returns false if the frame
839 * can be processed immediately, true if it was consumed.
841 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
842 struct tid_ampdu_rx
*tid_agg_rx
,
844 struct sk_buff_head
*frames
)
846 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
847 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
848 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
849 u16 head_seq_num
, buf_size
;
853 spin_lock(&tid_agg_rx
->reorder_lock
);
855 buf_size
= tid_agg_rx
->buf_size
;
856 head_seq_num
= tid_agg_rx
->head_seq_num
;
858 /* frame with out of date sequence number */
859 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
865 * If frame the sequence number exceeds our buffering window
866 * size release some previous frames to make room for this one.
868 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
869 head_seq_num
= ieee80211_sn_inc(
870 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
871 /* release stored frames up to new head to stack */
872 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
873 head_seq_num
, frames
);
876 /* Now the new frame is always in the range of the reordering buffer */
878 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
880 /* check if we already stored this frame */
881 if (tid_agg_rx
->reorder_buf
[index
]) {
887 * If the current MPDU is in the right order and nothing else
888 * is stored we can process it directly, no need to buffer it.
889 * If it is first but there's something stored, we may be able
890 * to release frames after this one.
892 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
893 tid_agg_rx
->stored_mpdu_num
== 0) {
894 tid_agg_rx
->head_seq_num
=
895 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
900 /* put the frame in the reordering buffer */
901 tid_agg_rx
->reorder_buf
[index
] = skb
;
902 tid_agg_rx
->reorder_time
[index
] = jiffies
;
903 tid_agg_rx
->stored_mpdu_num
++;
904 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
907 spin_unlock(&tid_agg_rx
->reorder_lock
);
912 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
913 * true if the MPDU was buffered, false if it should be processed.
915 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
916 struct sk_buff_head
*frames
)
918 struct sk_buff
*skb
= rx
->skb
;
919 struct ieee80211_local
*local
= rx
->local
;
920 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
921 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
922 struct sta_info
*sta
= rx
->sta
;
923 struct tid_ampdu_rx
*tid_agg_rx
;
927 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
928 is_multicast_ether_addr(hdr
->addr1
))
932 * filter the QoS data rx stream according to
933 * STA/TID and check if this STA/TID is on aggregation
939 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
940 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
941 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
943 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
947 /* qos null data frames are excluded */
948 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
951 /* not part of a BA session */
952 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
953 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
956 /* not actually part of this BA session */
957 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
960 /* new, potentially un-ordered, ampdu frame - process it */
962 /* reset session timer */
963 if (tid_agg_rx
->timeout
)
964 tid_agg_rx
->last_rx
= jiffies
;
966 /* if this mpdu is fragmented - terminate rx aggregation session */
967 sc
= le16_to_cpu(hdr
->seq_ctrl
);
968 if (sc
& IEEE80211_SCTL_FRAG
) {
969 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
970 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
971 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
976 * No locking needed -- we will only ever process one
977 * RX packet at a time, and thus own tid_agg_rx. All
978 * other code manipulating it needs to (and does) make
979 * sure that we cannot get to it any more before doing
982 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
987 __skb_queue_tail(frames
, skb
);
990 static ieee80211_rx_result debug_noinline
991 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
993 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
994 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
997 * Drop duplicate 802.11 retransmissions
998 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1000 if (rx
->skb
->len
>= 24 && rx
->sta
&&
1001 !ieee80211_is_ctl(hdr
->frame_control
) &&
1002 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1003 !is_multicast_ether_addr(hdr
->addr1
)) {
1004 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1005 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
1007 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1008 rx
->local
->dot11FrameDuplicateCount
++;
1009 rx
->sta
->num_duplicates
++;
1011 return RX_DROP_UNUSABLE
;
1012 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1013 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1017 if (unlikely(rx
->skb
->len
< 16)) {
1018 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
1019 return RX_DROP_MONITOR
;
1022 /* Drop disallowed frame classes based on STA auth/assoc state;
1023 * IEEE 802.11, Chap 5.5.
1025 * mac80211 filters only based on association state, i.e. it drops
1026 * Class 3 frames from not associated stations. hostapd sends
1027 * deauth/disassoc frames when needed. In addition, hostapd is
1028 * responsible for filtering on both auth and assoc states.
1031 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1032 return ieee80211_rx_mesh_check(rx
);
1034 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1035 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1036 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1037 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1038 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1040 * accept port control frames from the AP even when it's not
1041 * yet marked ASSOC to prevent a race where we don't set the
1042 * assoc bit quickly enough before it sends the first frame
1044 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1045 ieee80211_is_data_present(hdr
->frame_control
)) {
1046 unsigned int hdrlen
;
1049 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1051 if (rx
->skb
->len
< hdrlen
+ 8)
1052 return RX_DROP_MONITOR
;
1054 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1055 if (ethertype
== rx
->sdata
->control_port_protocol
)
1059 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1060 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1063 return RX_DROP_UNUSABLE
;
1065 return RX_DROP_MONITOR
;
1072 static ieee80211_rx_result debug_noinline
1073 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1075 struct ieee80211_local
*local
;
1076 struct ieee80211_hdr
*hdr
;
1077 struct sk_buff
*skb
;
1081 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1083 if (!local
->pspolling
)
1086 if (!ieee80211_has_fromds(hdr
->frame_control
))
1087 /* this is not from AP */
1090 if (!ieee80211_is_data(hdr
->frame_control
))
1093 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1094 /* AP has no more frames buffered for us */
1095 local
->pspolling
= false;
1099 /* more data bit is set, let's request a new frame from the AP */
1100 ieee80211_send_pspoll(local
, rx
->sdata
);
1105 static void sta_ps_start(struct sta_info
*sta
)
1107 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1108 struct ieee80211_local
*local
= sdata
->local
;
1111 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1112 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1113 ps
= &sdata
->bss
->ps
;
1117 atomic_inc(&ps
->num_sta_ps
);
1118 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1119 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1120 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1121 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1122 sta
->sta
.addr
, sta
->sta
.aid
);
1125 static void sta_ps_end(struct sta_info
*sta
)
1127 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1128 sta
->sta
.addr
, sta
->sta
.aid
);
1130 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1131 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1132 sta
->sta
.addr
, sta
->sta
.aid
);
1136 ieee80211_sta_ps_deliver_wakeup(sta
);
1139 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1141 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1144 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1146 /* Don't let the same PS state be set twice */
1147 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1148 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1152 sta_ps_start(sta_inf
);
1154 sta_ps_end(sta_inf
);
1158 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1160 static ieee80211_rx_result debug_noinline
1161 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1163 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1164 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1165 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1168 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1171 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1172 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1176 * The device handles station powersave, so don't do anything about
1177 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1178 * it to mac80211 since they're handled.)
1180 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1184 * Don't do anything if the station isn't already asleep. In
1185 * the uAPSD case, the station will probably be marked asleep,
1186 * in the PS-Poll case the station must be confused ...
1188 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1191 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1192 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1193 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1194 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1196 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1199 /* Free PS Poll skb here instead of returning RX_DROP that would
1200 * count as an dropped frame. */
1201 dev_kfree_skb(rx
->skb
);
1204 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1205 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1206 ieee80211_has_pm(hdr
->frame_control
) &&
1207 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1208 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1209 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1210 ac
= ieee802_1d_to_ac
[tid
& 7];
1213 * If this AC is not trigger-enabled do nothing.
1215 * NB: This could/should check a separate bitmap of trigger-
1216 * enabled queues, but for now we only implement uAPSD w/o
1217 * TSPEC changes to the ACs, so they're always the same.
1219 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1222 /* if we are in a service period, do nothing */
1223 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1226 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1227 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1229 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1235 static ieee80211_rx_result debug_noinline
1236 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1238 struct sta_info
*sta
= rx
->sta
;
1239 struct sk_buff
*skb
= rx
->skb
;
1240 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1241 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1248 * Update last_rx only for IBSS packets which are for the current
1249 * BSSID and for station already AUTHORIZED to avoid keeping the
1250 * current IBSS network alive in cases where other STAs start
1251 * using different BSSID. This will also give the station another
1252 * chance to restart the authentication/authorization in case
1253 * something went wrong the first time.
1255 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1256 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1257 NL80211_IFTYPE_ADHOC
);
1258 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1259 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1260 sta
->last_rx
= jiffies
;
1261 if (ieee80211_is_data(hdr
->frame_control
)) {
1262 sta
->last_rx_rate_idx
= status
->rate_idx
;
1263 sta
->last_rx_rate_flag
= status
->flag
;
1264 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1267 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1269 * Mesh beacons will update last_rx when if they are found to
1270 * match the current local configuration when processed.
1272 sta
->last_rx
= jiffies
;
1273 if (ieee80211_is_data(hdr
->frame_control
)) {
1274 sta
->last_rx_rate_idx
= status
->rate_idx
;
1275 sta
->last_rx_rate_flag
= status
->flag
;
1276 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1280 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1283 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1284 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1286 sta
->rx_fragments
++;
1287 sta
->rx_bytes
+= rx
->skb
->len
;
1288 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1289 sta
->last_signal
= status
->signal
;
1290 ewma_add(&sta
->avg_signal
, -status
->signal
);
1293 if (status
->chains
) {
1294 sta
->chains
= status
->chains
;
1295 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1296 int signal
= status
->chain_signal
[i
];
1298 if (!(status
->chains
& BIT(i
)))
1301 sta
->chain_signal_last
[i
] = signal
;
1302 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1307 * Change STA power saving mode only at the end of a frame
1308 * exchange sequence.
1310 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1311 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1312 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1313 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1314 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1315 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1317 * Ignore doze->wake transitions that are
1318 * indicated by non-data frames, the standard
1319 * is unclear here, but for example going to
1320 * PS mode and then scanning would cause a
1321 * doze->wake transition for the probe request,
1322 * and that is clearly undesirable.
1324 if (ieee80211_is_data(hdr
->frame_control
) &&
1325 !ieee80211_has_pm(hdr
->frame_control
))
1328 if (ieee80211_has_pm(hdr
->frame_control
))
1333 /* mesh power save support */
1334 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1335 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1341 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1342 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1343 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1346 * If we receive a 4-addr nullfunc frame from a STA
1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
1351 if (ieee80211_has_a4(hdr
->frame_control
) &&
1352 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1353 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1354 !rx
->sdata
->u
.vlan
.sta
))) {
1355 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx
->sdata
->dev
, sta
->sta
.addr
,
1359 return RX_DROP_MONITOR
;
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1366 dev_kfree_skb(rx
->skb
);
1371 } /* ieee80211_rx_h_sta_process */
1373 static ieee80211_rx_result debug_noinline
1374 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1376 struct sk_buff
*skb
= rx
->skb
;
1377 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1378 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1381 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1382 struct ieee80211_key
*sta_ptk
= NULL
;
1383 int mmie_keyidx
= -1;
1385 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1390 * There are four types of keys:
1391 * - GTK (group keys)
1392 * - IGTK (group keys for management frames)
1393 * - PTK (pairwise keys)
1394 * - STK (station-to-station pairwise keys)
1396 * When selecting a key, we have to distinguish between multicast
1397 * (including broadcast) and unicast frames, the latter can only
1398 * use PTKs and STKs while the former always use GTKs and IGTKs.
1399 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1400 * unicast frames can also use key indices like GTKs. Hence, if we
1401 * don't have a PTK/STK we check the key index for a WEP key.
1403 * Note that in a regular BSS, multicast frames are sent by the
1404 * AP only, associated stations unicast the frame to the AP first
1405 * which then multicasts it on their behalf.
1407 * There is also a slight problem in IBSS mode: GTKs are negotiated
1408 * with each station, that is something we don't currently handle.
1409 * The spec seems to expect that one negotiates the same key with
1410 * every station but there's no such requirement; VLANs could be
1415 * No point in finding a key and decrypting if the frame is neither
1416 * addressed to us nor a multicast frame.
1418 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1421 /* start without a key */
1423 fc
= hdr
->frame_control
;
1426 int keyid
= rx
->sta
->ptk_idx
;
1428 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1429 cs
= rx
->sta
->cipher_scheme
;
1430 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1431 if (unlikely(keyid
< 0))
1432 return RX_DROP_UNUSABLE
;
1434 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1437 if (!ieee80211_has_protected(fc
))
1438 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1440 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1442 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1443 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1445 /* Skip decryption if the frame is not protected. */
1446 if (!ieee80211_has_protected(fc
))
1448 } else if (mmie_keyidx
>= 0) {
1449 /* Broadcast/multicast robust management frame / BIP */
1450 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1451 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1454 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1455 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1456 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1458 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1460 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1461 } else if (!ieee80211_has_protected(fc
)) {
1463 * The frame was not protected, so skip decryption. However, we
1464 * need to set rx->key if there is a key that could have been
1465 * used so that the frame may be dropped if encryption would
1466 * have been expected.
1468 struct ieee80211_key
*key
= NULL
;
1469 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1472 if (ieee80211_is_mgmt(fc
) &&
1473 is_multicast_ether_addr(hdr
->addr1
) &&
1474 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1478 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1479 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1485 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1486 key
= rcu_dereference(sdata
->keys
[i
]);
1499 * The device doesn't give us the IV so we won't be
1500 * able to look up the key. That's ok though, we
1501 * don't need to decrypt the frame, we just won't
1502 * be able to keep statistics accurate.
1503 * Except for key threshold notifications, should
1504 * we somehow allow the driver to tell us which key
1505 * the hardware used if this flag is set?
1507 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1508 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1511 hdrlen
= ieee80211_hdrlen(fc
);
1514 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1516 if (unlikely(keyidx
< 0))
1517 return RX_DROP_UNUSABLE
;
1519 if (rx
->skb
->len
< 8 + hdrlen
)
1520 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1522 * no need to call ieee80211_wep_get_keyidx,
1523 * it verifies a bunch of things we've done already
1525 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1526 keyidx
= keyid
>> 6;
1529 /* check per-station GTK first, if multicast packet */
1530 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1531 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1533 /* if not found, try default key */
1535 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1538 * RSNA-protected unicast frames should always be
1539 * sent with pairwise or station-to-station keys,
1540 * but for WEP we allow using a key index as well.
1543 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1544 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1545 !is_multicast_ether_addr(hdr
->addr1
))
1551 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1552 return RX_DROP_MONITOR
;
1554 rx
->key
->tx_rx_count
++;
1555 /* TODO: add threshold stuff again */
1557 return RX_DROP_MONITOR
;
1560 switch (rx
->key
->conf
.cipher
) {
1561 case WLAN_CIPHER_SUITE_WEP40
:
1562 case WLAN_CIPHER_SUITE_WEP104
:
1563 result
= ieee80211_crypto_wep_decrypt(rx
);
1565 case WLAN_CIPHER_SUITE_TKIP
:
1566 result
= ieee80211_crypto_tkip_decrypt(rx
);
1568 case WLAN_CIPHER_SUITE_CCMP
:
1569 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1571 case WLAN_CIPHER_SUITE_AES_CMAC
:
1572 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1575 result
= ieee80211_crypto_hw_decrypt(rx
);
1578 /* the hdr variable is invalid after the decrypt handlers */
1580 /* either the frame has been decrypted or will be dropped */
1581 status
->flag
|= RX_FLAG_DECRYPTED
;
1586 static inline struct ieee80211_fragment_entry
*
1587 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1588 unsigned int frag
, unsigned int seq
, int rx_queue
,
1589 struct sk_buff
**skb
)
1591 struct ieee80211_fragment_entry
*entry
;
1593 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1594 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1595 sdata
->fragment_next
= 0;
1597 if (!skb_queue_empty(&entry
->skb_list
))
1598 __skb_queue_purge(&entry
->skb_list
);
1600 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1602 entry
->first_frag_time
= jiffies
;
1604 entry
->rx_queue
= rx_queue
;
1605 entry
->last_frag
= frag
;
1607 entry
->extra_len
= 0;
1612 static inline struct ieee80211_fragment_entry
*
1613 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1614 unsigned int frag
, unsigned int seq
,
1615 int rx_queue
, struct ieee80211_hdr
*hdr
)
1617 struct ieee80211_fragment_entry
*entry
;
1620 idx
= sdata
->fragment_next
;
1621 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1622 struct ieee80211_hdr
*f_hdr
;
1626 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1628 entry
= &sdata
->fragments
[idx
];
1629 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1630 entry
->rx_queue
!= rx_queue
||
1631 entry
->last_frag
+ 1 != frag
)
1634 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1637 * Check ftype and addresses are equal, else check next fragment
1639 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1640 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1641 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1642 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1645 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1646 __skb_queue_purge(&entry
->skb_list
);
1655 static ieee80211_rx_result debug_noinline
1656 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1658 struct ieee80211_hdr
*hdr
;
1661 unsigned int frag
, seq
;
1662 struct ieee80211_fragment_entry
*entry
;
1663 struct sk_buff
*skb
;
1664 struct ieee80211_rx_status
*status
;
1666 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1667 fc
= hdr
->frame_control
;
1669 if (ieee80211_is_ctl(fc
))
1672 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1673 frag
= sc
& IEEE80211_SCTL_FRAG
;
1675 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1676 is_multicast_ether_addr(hdr
->addr1
))) {
1677 /* not fragmented */
1680 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1682 if (skb_linearize(rx
->skb
))
1683 return RX_DROP_UNUSABLE
;
1686 * skb_linearize() might change the skb->data and
1687 * previously cached variables (in this case, hdr) need to
1688 * be refreshed with the new data.
1690 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1691 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1694 /* This is the first fragment of a new frame. */
1695 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1696 rx
->seqno_idx
, &(rx
->skb
));
1697 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1698 ieee80211_has_protected(fc
)) {
1699 int queue
= rx
->security_idx
;
1700 /* Store CCMP PN so that we can verify that the next
1701 * fragment has a sequential PN value. */
1703 memcpy(entry
->last_pn
,
1704 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1705 IEEE80211_CCMP_PN_LEN
);
1710 /* This is a fragment for a frame that should already be pending in
1711 * fragment cache. Add this fragment to the end of the pending entry.
1713 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1714 rx
->seqno_idx
, hdr
);
1716 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1717 return RX_DROP_MONITOR
;
1720 /* Verify that MPDUs within one MSDU have sequential PN values.
1721 * (IEEE 802.11i, 8.3.3.4.5) */
1724 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1726 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1727 return RX_DROP_UNUSABLE
;
1728 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1729 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1734 queue
= rx
->security_idx
;
1735 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1736 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1737 return RX_DROP_UNUSABLE
;
1738 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1741 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1742 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1743 entry
->last_frag
= frag
;
1744 entry
->extra_len
+= rx
->skb
->len
;
1745 if (ieee80211_has_morefrags(fc
)) {
1750 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1751 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1752 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1753 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1755 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1756 __skb_queue_purge(&entry
->skb_list
);
1757 return RX_DROP_UNUSABLE
;
1760 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1761 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1765 /* Complete frame has been reassembled - process it now */
1766 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1767 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1771 rx
->sta
->rx_packets
++;
1772 if (is_multicast_ether_addr(hdr
->addr1
))
1773 rx
->local
->dot11MulticastReceivedFrameCount
++;
1775 ieee80211_led_rx(rx
->local
);
1779 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1781 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1787 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1789 struct sk_buff
*skb
= rx
->skb
;
1790 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1793 * Pass through unencrypted frames if the hardware has
1794 * decrypted them already.
1796 if (status
->flag
& RX_FLAG_DECRYPTED
)
1799 /* Drop unencrypted frames if key is set. */
1800 if (unlikely(!ieee80211_has_protected(fc
) &&
1801 !ieee80211_is_nullfunc(fc
) &&
1802 ieee80211_is_data(fc
) &&
1803 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1809 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1811 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1812 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1813 __le16 fc
= hdr
->frame_control
;
1816 * Pass through unencrypted frames if the hardware has
1817 * decrypted them already.
1819 if (status
->flag
& RX_FLAG_DECRYPTED
)
1822 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1823 if (unlikely(!ieee80211_has_protected(fc
) &&
1824 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1826 if (ieee80211_is_deauth(fc
) ||
1827 ieee80211_is_disassoc(fc
))
1828 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1833 /* BIP does not use Protected field, so need to check MMIE */
1834 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1835 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1836 if (ieee80211_is_deauth(fc
) ||
1837 ieee80211_is_disassoc(fc
))
1838 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1844 * When using MFP, Action frames are not allowed prior to
1845 * having configured keys.
1847 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1848 ieee80211_is_robust_mgmt_frame(
1849 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1857 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1859 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1860 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1861 bool check_port_control
= false;
1862 struct ethhdr
*ehdr
;
1865 *port_control
= false;
1866 if (ieee80211_has_a4(hdr
->frame_control
) &&
1867 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1870 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1871 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1873 if (!sdata
->u
.mgd
.use_4addr
)
1876 check_port_control
= true;
1879 if (is_multicast_ether_addr(hdr
->addr1
) &&
1880 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1883 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1887 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1888 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1889 *port_control
= true;
1890 else if (check_port_control
)
1897 * requires that rx->skb is a frame with ethernet header
1899 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1901 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1902 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1903 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1906 * Allow EAPOL frames to us/the PAE group address regardless
1907 * of whether the frame was encrypted or not.
1909 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1910 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1911 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1914 if (ieee80211_802_1x_port_control(rx
) ||
1915 ieee80211_drop_unencrypted(rx
, fc
))
1922 * requires that rx->skb is a frame with ethernet header
1925 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1927 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1928 struct net_device
*dev
= sdata
->dev
;
1929 struct sk_buff
*skb
, *xmit_skb
;
1930 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1931 struct sta_info
*dsta
;
1932 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1937 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1938 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1939 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1940 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1941 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1942 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1944 * send multicast frames both to higher layers in
1945 * local net stack and back to the wireless medium
1947 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1949 net_info_ratelimited("%s: failed to clone multicast frame\n",
1952 dsta
= sta_info_get(sdata
, skb
->data
);
1955 * The destination station is associated to
1956 * this AP (in this VLAN), so send the frame
1957 * directly to it and do not pass it to local
1967 int align __maybe_unused
;
1969 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1971 * 'align' will only take the values 0 or 2 here
1972 * since all frames are required to be aligned
1973 * to 2-byte boundaries when being passed to
1974 * mac80211; the code here works just as well if
1975 * that isn't true, but mac80211 assumes it can
1976 * access fields as 2-byte aligned (e.g. for
1977 * compare_ether_addr)
1979 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1981 if (WARN_ON(skb_headroom(skb
) < 3)) {
1985 u8
*data
= skb
->data
;
1986 size_t len
= skb_headlen(skb
);
1988 memmove(skb
->data
, data
, len
);
1989 skb_set_tail_pointer(skb
, len
);
1995 /* deliver to local stack */
1996 skb
->protocol
= eth_type_trans(skb
, dev
);
1997 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1998 netif_receive_skb(skb
);
2004 * Send to wireless media and increase priority by 256 to
2005 * keep the received priority instead of reclassifying
2006 * the frame (see cfg80211_classify8021d).
2008 xmit_skb
->priority
+= 256;
2009 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2010 skb_reset_network_header(xmit_skb
);
2011 skb_reset_mac_header(xmit_skb
);
2012 dev_queue_xmit(xmit_skb
);
2016 static ieee80211_rx_result debug_noinline
2017 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2019 struct net_device
*dev
= rx
->sdata
->dev
;
2020 struct sk_buff
*skb
= rx
->skb
;
2021 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2022 __le16 fc
= hdr
->frame_control
;
2023 struct sk_buff_head frame_list
;
2024 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2026 if (unlikely(!ieee80211_is_data(fc
)))
2029 if (unlikely(!ieee80211_is_data_present(fc
)))
2030 return RX_DROP_MONITOR
;
2032 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2035 if (ieee80211_has_a4(hdr
->frame_control
) &&
2036 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2037 !rx
->sdata
->u
.vlan
.sta
)
2038 return RX_DROP_UNUSABLE
;
2040 if (is_multicast_ether_addr(hdr
->addr1
) &&
2041 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2042 rx
->sdata
->u
.vlan
.sta
) ||
2043 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2044 rx
->sdata
->u
.mgd
.use_4addr
)))
2045 return RX_DROP_UNUSABLE
;
2048 __skb_queue_head_init(&frame_list
);
2050 if (skb_linearize(skb
))
2051 return RX_DROP_UNUSABLE
;
2053 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2054 rx
->sdata
->vif
.type
,
2055 rx
->local
->hw
.extra_tx_headroom
, true);
2057 while (!skb_queue_empty(&frame_list
)) {
2058 rx
->skb
= __skb_dequeue(&frame_list
);
2060 if (!ieee80211_frame_allowed(rx
, fc
)) {
2061 dev_kfree_skb(rx
->skb
);
2064 dev
->stats
.rx_packets
++;
2065 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2067 ieee80211_deliver_skb(rx
);
2073 #ifdef CONFIG_MAC80211_MESH
2074 static ieee80211_rx_result
2075 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2077 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2078 struct ieee80211_tx_info
*info
;
2079 struct ieee80211s_hdr
*mesh_hdr
;
2080 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2081 struct ieee80211_local
*local
= rx
->local
;
2082 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2083 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2084 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2087 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2088 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2090 /* make sure fixed part of mesh header is there, also checks skb len */
2091 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2092 return RX_DROP_MONITOR
;
2094 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2096 /* make sure full mesh header is there, also checks skb len */
2097 if (!pskb_may_pull(rx
->skb
,
2098 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2099 return RX_DROP_MONITOR
;
2101 /* reload pointers */
2102 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2103 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2105 /* frame is in RMC, don't forward */
2106 if (ieee80211_is_data(hdr
->frame_control
) &&
2107 is_multicast_ether_addr(hdr
->addr1
) &&
2108 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2109 return RX_DROP_MONITOR
;
2111 if (!ieee80211_is_data(hdr
->frame_control
) ||
2112 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2116 return RX_DROP_MONITOR
;
2118 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2119 struct mesh_path
*mppath
;
2123 if (is_multicast_ether_addr(hdr
->addr1
)) {
2124 mpp_addr
= hdr
->addr3
;
2125 proxied_addr
= mesh_hdr
->eaddr1
;
2126 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2127 /* has_a4 already checked in ieee80211_rx_mesh_check */
2128 mpp_addr
= hdr
->addr4
;
2129 proxied_addr
= mesh_hdr
->eaddr2
;
2131 return RX_DROP_MONITOR
;
2135 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2137 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2139 spin_lock_bh(&mppath
->state_lock
);
2140 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2141 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2142 spin_unlock_bh(&mppath
->state_lock
);
2147 /* Frame has reached destination. Don't forward */
2148 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2149 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2152 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2153 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2154 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2155 return RX_DROP_MONITOR
;
2157 skb_set_queue_mapping(skb
, q
);
2159 if (!--mesh_hdr
->ttl
) {
2160 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2164 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2167 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2169 net_info_ratelimited("%s: failed to clone mesh frame\n",
2174 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2175 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2176 info
= IEEE80211_SKB_CB(fwd_skb
);
2177 memset(info
, 0, sizeof(*info
));
2178 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2179 info
->control
.vif
= &rx
->sdata
->vif
;
2180 info
->control
.jiffies
= jiffies
;
2181 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2182 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2183 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2184 /* update power mode indication when forwarding */
2185 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2186 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2187 /* mesh power mode flags updated in mesh_nexthop_lookup */
2188 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2190 /* unable to resolve next hop */
2191 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2193 WLAN_REASON_MESH_PATH_NOFORWARD
,
2195 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2197 return RX_DROP_MONITOR
;
2200 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2201 ieee80211_add_pending_skb(local
, fwd_skb
);
2203 if (is_multicast_ether_addr(hdr
->addr1
) ||
2204 sdata
->dev
->flags
& IFF_PROMISC
)
2207 return RX_DROP_MONITOR
;
2211 static ieee80211_rx_result debug_noinline
2212 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2214 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2215 struct ieee80211_local
*local
= rx
->local
;
2216 struct net_device
*dev
= sdata
->dev
;
2217 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2218 __le16 fc
= hdr
->frame_control
;
2222 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2225 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2226 return RX_DROP_MONITOR
;
2229 * Send unexpected-4addr-frame event to hostapd. For older versions,
2230 * also drop the frame to cooked monitor interfaces.
2232 if (ieee80211_has_a4(hdr
->frame_control
) &&
2233 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2235 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2236 cfg80211_rx_unexpected_4addr_frame(
2237 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2238 return RX_DROP_MONITOR
;
2241 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2243 return RX_DROP_UNUSABLE
;
2245 if (!ieee80211_frame_allowed(rx
, fc
))
2246 return RX_DROP_MONITOR
;
2248 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2249 unlikely(port_control
) && sdata
->bss
) {
2250 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2258 dev
->stats
.rx_packets
++;
2259 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2261 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2262 !is_multicast_ether_addr(
2263 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2264 (!local
->scanning
&&
2265 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2266 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2267 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2270 ieee80211_deliver_skb(rx
);
2275 static ieee80211_rx_result debug_noinline
2276 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2278 struct sk_buff
*skb
= rx
->skb
;
2279 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2280 struct tid_ampdu_rx
*tid_agg_rx
;
2284 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2287 if (ieee80211_is_back_req(bar
->frame_control
)) {
2289 __le16 control
, start_seq_num
;
2290 } __packed bar_data
;
2293 return RX_DROP_MONITOR
;
2295 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2296 &bar_data
, sizeof(bar_data
)))
2297 return RX_DROP_MONITOR
;
2299 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2301 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2303 return RX_DROP_MONITOR
;
2305 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2307 /* reset session timer */
2308 if (tid_agg_rx
->timeout
)
2309 mod_timer(&tid_agg_rx
->session_timer
,
2310 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2312 spin_lock(&tid_agg_rx
->reorder_lock
);
2313 /* release stored frames up to start of BAR */
2314 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2315 start_seq_num
, frames
);
2316 spin_unlock(&tid_agg_rx
->reorder_lock
);
2323 * After this point, we only want management frames,
2324 * so we can drop all remaining control frames to
2325 * cooked monitor interfaces.
2327 return RX_DROP_MONITOR
;
2330 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2331 struct ieee80211_mgmt
*mgmt
,
2334 struct ieee80211_local
*local
= sdata
->local
;
2335 struct sk_buff
*skb
;
2336 struct ieee80211_mgmt
*resp
;
2338 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2339 /* Not to own unicast address */
2343 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2344 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2345 /* Not from the current AP or not associated yet. */
2349 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2350 /* Too short SA Query request frame */
2354 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2358 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2359 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2360 memset(resp
, 0, 24);
2361 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2362 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2363 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2364 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2365 IEEE80211_STYPE_ACTION
);
2366 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2367 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2368 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2369 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2370 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2371 WLAN_SA_QUERY_TR_ID_LEN
);
2373 ieee80211_tx_skb(sdata
, skb
);
2376 static ieee80211_rx_result debug_noinline
2377 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2379 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2380 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2383 * From here on, look only at management frames.
2384 * Data and control frames are already handled,
2385 * and unknown (reserved) frames are useless.
2387 if (rx
->skb
->len
< 24)
2388 return RX_DROP_MONITOR
;
2390 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2391 return RX_DROP_MONITOR
;
2393 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2394 ieee80211_is_beacon(mgmt
->frame_control
) &&
2395 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2398 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2399 sig
= status
->signal
;
2401 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2402 rx
->skb
->data
, rx
->skb
->len
,
2404 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2407 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2408 return RX_DROP_MONITOR
;
2410 if (ieee80211_drop_unencrypted_mgmt(rx
))
2411 return RX_DROP_UNUSABLE
;
2416 static ieee80211_rx_result debug_noinline
2417 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2419 struct ieee80211_local
*local
= rx
->local
;
2420 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2421 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2422 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2423 int len
= rx
->skb
->len
;
2425 if (!ieee80211_is_action(mgmt
->frame_control
))
2428 /* drop too small frames */
2429 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2430 return RX_DROP_UNUSABLE
;
2432 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2433 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2434 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2435 return RX_DROP_UNUSABLE
;
2437 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2438 return RX_DROP_UNUSABLE
;
2440 switch (mgmt
->u
.action
.category
) {
2441 case WLAN_CATEGORY_HT
:
2442 /* reject HT action frames from stations not supporting HT */
2443 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2446 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2447 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2448 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2449 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2450 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2453 /* verify action & smps_control/chanwidth are present */
2454 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2457 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2458 case WLAN_HT_ACTION_SMPS
: {
2459 struct ieee80211_supported_band
*sband
;
2460 enum ieee80211_smps_mode smps_mode
;
2462 /* convert to HT capability */
2463 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2464 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2465 smps_mode
= IEEE80211_SMPS_OFF
;
2467 case WLAN_HT_SMPS_CONTROL_STATIC
:
2468 smps_mode
= IEEE80211_SMPS_STATIC
;
2470 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2471 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2477 /* if no change do nothing */
2478 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2480 rx
->sta
->sta
.smps_mode
= smps_mode
;
2482 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2484 rate_control_rate_update(local
, sband
, rx
->sta
,
2485 IEEE80211_RC_SMPS_CHANGED
);
2488 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2489 struct ieee80211_supported_band
*sband
;
2490 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2491 enum ieee80211_sta_rx_bandwidth new_bw
;
2493 /* If it doesn't support 40 MHz it can't change ... */
2494 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2495 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2498 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2499 new_bw
= IEEE80211_STA_RX_BW_20
;
2501 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2503 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2506 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2508 rate_control_rate_update(local
, sband
, rx
->sta
,
2509 IEEE80211_RC_BW_CHANGED
);
2517 case WLAN_CATEGORY_PUBLIC
:
2518 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2520 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2524 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2526 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2527 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2529 if (len
< offsetof(struct ieee80211_mgmt
,
2530 u
.action
.u
.ext_chan_switch
.variable
))
2533 case WLAN_CATEGORY_VHT
:
2534 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2535 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2536 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2537 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2538 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2541 /* verify action code is present */
2542 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2545 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2546 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2549 /* verify opmode is present */
2550 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2553 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2555 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2556 opmode
, status
->band
,
2564 case WLAN_CATEGORY_BACK
:
2565 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2566 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2567 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2568 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2569 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2572 /* verify action_code is present */
2573 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2576 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2577 case WLAN_ACTION_ADDBA_REQ
:
2578 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2579 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2582 case WLAN_ACTION_ADDBA_RESP
:
2583 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2584 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2587 case WLAN_ACTION_DELBA
:
2588 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2589 sizeof(mgmt
->u
.action
.u
.delba
)))
2597 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2598 /* verify action_code is present */
2599 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2602 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2603 case WLAN_ACTION_SPCT_MSR_REQ
:
2604 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2607 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2608 sizeof(mgmt
->u
.action
.u
.measurement
)))
2611 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2614 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2616 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2618 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2619 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2622 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2623 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2624 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2627 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2628 bssid
= sdata
->u
.mgd
.bssid
;
2629 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2630 bssid
= sdata
->u
.ibss
.bssid
;
2631 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2636 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2643 case WLAN_CATEGORY_SA_QUERY
:
2644 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2645 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2648 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2649 case WLAN_ACTION_SA_QUERY_REQUEST
:
2650 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2652 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2656 case WLAN_CATEGORY_SELF_PROTECTED
:
2657 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2658 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2661 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2662 case WLAN_SP_MESH_PEERING_OPEN
:
2663 case WLAN_SP_MESH_PEERING_CLOSE
:
2664 case WLAN_SP_MESH_PEERING_CONFIRM
:
2665 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2667 if (sdata
->u
.mesh
.user_mpm
)
2668 /* userspace handles this frame */
2671 case WLAN_SP_MGK_INFORM
:
2672 case WLAN_SP_MGK_ACK
:
2673 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2678 case WLAN_CATEGORY_MESH_ACTION
:
2679 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2680 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2683 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2685 if (mesh_action_is_path_sel(mgmt
) &&
2686 !mesh_path_sel_is_hwmp(sdata
))
2694 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2695 /* will return in the next handlers */
2700 rx
->sta
->rx_packets
++;
2701 dev_kfree_skb(rx
->skb
);
2705 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2706 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2707 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2709 rx
->sta
->rx_packets
++;
2713 static ieee80211_rx_result debug_noinline
2714 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2716 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2719 /* skip known-bad action frames and return them in the next handler */
2720 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2724 * Getting here means the kernel doesn't know how to handle
2725 * it, but maybe userspace does ... include returned frames
2726 * so userspace can register for those to know whether ones
2727 * it transmitted were processed or returned.
2730 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2731 sig
= status
->signal
;
2733 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2734 rx
->skb
->data
, rx
->skb
->len
, 0, GFP_ATOMIC
)) {
2736 rx
->sta
->rx_packets
++;
2737 dev_kfree_skb(rx
->skb
);
2744 static ieee80211_rx_result debug_noinline
2745 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2747 struct ieee80211_local
*local
= rx
->local
;
2748 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2749 struct sk_buff
*nskb
;
2750 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2751 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2753 if (!ieee80211_is_action(mgmt
->frame_control
))
2757 * For AP mode, hostapd is responsible for handling any action
2758 * frames that we didn't handle, including returning unknown
2759 * ones. For all other modes we will return them to the sender,
2760 * setting the 0x80 bit in the action category, as required by
2761 * 802.11-2012 9.24.4.
2762 * Newer versions of hostapd shall also use the management frame
2763 * registration mechanisms, but older ones still use cooked
2764 * monitor interfaces so push all frames there.
2766 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2767 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2768 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2769 return RX_DROP_MONITOR
;
2771 if (is_multicast_ether_addr(mgmt
->da
))
2772 return RX_DROP_MONITOR
;
2774 /* do not return rejected action frames */
2775 if (mgmt
->u
.action
.category
& 0x80)
2776 return RX_DROP_UNUSABLE
;
2778 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2781 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2783 nmgmt
->u
.action
.category
|= 0x80;
2784 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2785 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2787 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2789 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2790 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2792 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2793 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2794 IEEE80211_TX_CTL_NO_CCK_RATE
;
2795 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2797 local
->hw
.offchannel_tx_hw_queue
;
2800 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2803 dev_kfree_skb(rx
->skb
);
2807 static ieee80211_rx_result debug_noinline
2808 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2810 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2811 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2814 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2816 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2817 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2818 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2819 return RX_DROP_MONITOR
;
2822 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2823 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2824 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2825 /* process for all: mesh, mlme, ibss */
2827 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2828 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2829 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2830 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2831 if (is_multicast_ether_addr(mgmt
->da
) &&
2832 !is_broadcast_ether_addr(mgmt
->da
))
2833 return RX_DROP_MONITOR
;
2835 /* process only for station */
2836 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2837 return RX_DROP_MONITOR
;
2839 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2840 /* process only for ibss and mesh */
2841 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2842 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2843 return RX_DROP_MONITOR
;
2846 return RX_DROP_MONITOR
;
2849 /* queue up frame and kick off work to process it */
2850 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2851 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2852 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2854 rx
->sta
->rx_packets
++;
2859 /* TODO: use IEEE80211_RX_FRAGMENTED */
2860 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2861 struct ieee80211_rate
*rate
)
2863 struct ieee80211_sub_if_data
*sdata
;
2864 struct ieee80211_local
*local
= rx
->local
;
2865 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2866 struct net_device
*prev_dev
= NULL
;
2867 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2868 int needed_headroom
;
2871 * If cooked monitor has been processed already, then
2872 * don't do it again. If not, set the flag.
2874 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2876 rx
->flags
|= IEEE80211_RX_CMNTR
;
2878 /* If there are no cooked monitor interfaces, just free the SKB */
2879 if (!local
->cooked_mntrs
)
2882 /* room for the radiotap header based on driver features */
2883 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
2885 if (skb_headroom(skb
) < needed_headroom
&&
2886 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2889 /* prepend radiotap information */
2890 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2893 skb_set_mac_header(skb
, 0);
2894 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2895 skb
->pkt_type
= PACKET_OTHERHOST
;
2896 skb
->protocol
= htons(ETH_P_802_2
);
2898 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2899 if (!ieee80211_sdata_running(sdata
))
2902 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2903 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2907 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2909 skb2
->dev
= prev_dev
;
2910 netif_receive_skb(skb2
);
2914 prev_dev
= sdata
->dev
;
2915 sdata
->dev
->stats
.rx_packets
++;
2916 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2920 skb
->dev
= prev_dev
;
2921 netif_receive_skb(skb
);
2929 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2930 ieee80211_rx_result res
)
2933 case RX_DROP_MONITOR
:
2934 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2936 rx
->sta
->rx_dropped
++;
2939 struct ieee80211_rate
*rate
= NULL
;
2940 struct ieee80211_supported_band
*sband
;
2941 struct ieee80211_rx_status
*status
;
2943 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2945 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2946 if (!(status
->flag
& RX_FLAG_HT
) &&
2947 !(status
->flag
& RX_FLAG_VHT
))
2948 rate
= &sband
->bitrates
[status
->rate_idx
];
2950 ieee80211_rx_cooked_monitor(rx
, rate
);
2953 case RX_DROP_UNUSABLE
:
2954 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2956 rx
->sta
->rx_dropped
++;
2957 dev_kfree_skb(rx
->skb
);
2960 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2965 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2966 struct sk_buff_head
*frames
)
2968 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2969 struct sk_buff
*skb
;
2971 #define CALL_RXH(rxh) \
2974 if (res != RX_CONTINUE) \
2978 spin_lock_bh(&rx
->local
->rx_path_lock
);
2980 while ((skb
= __skb_dequeue(frames
))) {
2982 * all the other fields are valid across frames
2983 * that belong to an aMPDU since they are on the
2984 * same TID from the same station
2988 CALL_RXH(ieee80211_rx_h_check_more_data
)
2989 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2990 CALL_RXH(ieee80211_rx_h_sta_process
)
2991 CALL_RXH(ieee80211_rx_h_decrypt
)
2992 CALL_RXH(ieee80211_rx_h_defragment
)
2993 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2994 /* must be after MMIC verify so header is counted in MPDU mic */
2995 #ifdef CONFIG_MAC80211_MESH
2996 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2997 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2999 CALL_RXH(ieee80211_rx_h_amsdu
)
3000 CALL_RXH(ieee80211_rx_h_data
)
3002 /* special treatment -- needs the queue */
3003 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3004 if (res
!= RX_CONTINUE
)
3007 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3008 CALL_RXH(ieee80211_rx_h_action
)
3009 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3010 CALL_RXH(ieee80211_rx_h_action_return
)
3011 CALL_RXH(ieee80211_rx_h_mgmt
)
3014 ieee80211_rx_handlers_result(rx
, res
);
3019 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3022 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3024 struct sk_buff_head reorder_release
;
3025 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3027 __skb_queue_head_init(&reorder_release
);
3029 #define CALL_RXH(rxh) \
3032 if (res != RX_CONTINUE) \
3036 CALL_RXH(ieee80211_rx_h_check
)
3038 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3040 ieee80211_rx_handlers(rx
, &reorder_release
);
3044 ieee80211_rx_handlers_result(rx
, res
);
3050 * This function makes calls into the RX path, therefore
3051 * it has to be invoked under RCU read lock.
3053 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3055 struct sk_buff_head frames
;
3056 struct ieee80211_rx_data rx
= {
3058 .sdata
= sta
->sdata
,
3059 .local
= sta
->local
,
3060 /* This is OK -- must be QoS data frame */
3061 .security_idx
= tid
,
3065 struct tid_ampdu_rx
*tid_agg_rx
;
3067 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3071 __skb_queue_head_init(&frames
);
3073 spin_lock(&tid_agg_rx
->reorder_lock
);
3074 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3075 spin_unlock(&tid_agg_rx
->reorder_lock
);
3077 ieee80211_rx_handlers(&rx
, &frames
);
3080 /* main receive path */
3082 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3083 struct ieee80211_hdr
*hdr
)
3085 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3086 struct sk_buff
*skb
= rx
->skb
;
3087 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3088 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3089 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3091 switch (sdata
->vif
.type
) {
3092 case NL80211_IFTYPE_STATION
:
3093 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3096 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3097 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3098 sdata
->u
.mgd
.use_4addr
)
3100 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3103 case NL80211_IFTYPE_ADHOC
:
3106 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3107 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3109 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3111 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3113 } else if (!multicast
&&
3114 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3115 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3117 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3118 } else if (!rx
->sta
) {
3120 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3121 rate_idx
= 0; /* TODO: HT/VHT rates */
3123 rate_idx
= status
->rate_idx
;
3124 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3128 case NL80211_IFTYPE_MESH_POINT
:
3130 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3131 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3134 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3137 case NL80211_IFTYPE_AP_VLAN
:
3138 case NL80211_IFTYPE_AP
:
3140 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3142 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3144 * Accept public action frames even when the
3145 * BSSID doesn't match, this is used for P2P
3146 * and location updates. Note that mac80211
3147 * itself never looks at these frames.
3150 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3152 if (ieee80211_is_public_action(hdr
, skb
->len
))
3154 if (!ieee80211_is_beacon(hdr
->frame_control
))
3156 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3159 case NL80211_IFTYPE_WDS
:
3160 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3162 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3165 case NL80211_IFTYPE_P2P_DEVICE
:
3166 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3167 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3168 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3169 !ieee80211_is_beacon(hdr
->frame_control
))
3171 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3173 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3176 /* should never get here */
3185 * This function returns whether or not the SKB
3186 * was destined for RX processing or not, which,
3187 * if consume is true, is equivalent to whether
3188 * or not the skb was consumed.
3190 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3191 struct sk_buff
*skb
, bool consume
)
3193 struct ieee80211_local
*local
= rx
->local
;
3194 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3195 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3196 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3200 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3201 prepares
= prepare_for_handlers(rx
, hdr
);
3207 skb
= skb_copy(skb
, GFP_ATOMIC
);
3209 if (net_ratelimit())
3210 wiphy_debug(local
->hw
.wiphy
,
3211 "failed to copy skb for %s\n",
3219 ieee80211_invoke_rx_handlers(rx
);
3224 * This is the actual Rx frames handler. as it blongs to Rx path it must
3225 * be called with rcu_read_lock protection.
3227 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3228 struct sk_buff
*skb
)
3230 struct ieee80211_local
*local
= hw_to_local(hw
);
3231 struct ieee80211_sub_if_data
*sdata
;
3232 struct ieee80211_hdr
*hdr
;
3234 struct ieee80211_rx_data rx
;
3235 struct ieee80211_sub_if_data
*prev
;
3236 struct sta_info
*sta
, *tmp
, *prev_sta
;
3239 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3240 memset(&rx
, 0, sizeof(rx
));
3244 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3245 local
->dot11ReceivedFragmentCount
++;
3247 if (ieee80211_is_mgmt(fc
)) {
3248 /* drop frame if too short for header */
3249 if (skb
->len
< ieee80211_hdrlen(fc
))
3252 err
= skb_linearize(skb
);
3254 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3262 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3263 ieee80211_parse_qos(&rx
);
3264 ieee80211_verify_alignment(&rx
);
3266 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3267 ieee80211_is_beacon(hdr
->frame_control
)))
3268 ieee80211_scan_rx(local
, skb
);
3270 if (ieee80211_is_data(fc
)) {
3273 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3280 rx
.sdata
= prev_sta
->sdata
;
3281 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3288 rx
.sdata
= prev_sta
->sdata
;
3290 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3298 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3299 if (!ieee80211_sdata_running(sdata
))
3302 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3303 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3307 * frame is destined for this interface, but if it's
3308 * not also for the previous one we handle that after
3309 * the loop to avoid copying the SKB once too much
3317 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3319 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3325 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3328 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3337 * This is the receive path handler. It is called by a low level driver when an
3338 * 802.11 MPDU is received from the hardware.
3340 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3342 struct ieee80211_local
*local
= hw_to_local(hw
);
3343 struct ieee80211_rate
*rate
= NULL
;
3344 struct ieee80211_supported_band
*sband
;
3345 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3347 WARN_ON_ONCE(softirq_count() == 0);
3349 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3352 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3353 if (WARN_ON(!sband
))
3357 * If we're suspending, it is possible although not too likely
3358 * that we'd be receiving frames after having already partially
3359 * quiesced the stack. We can't process such frames then since
3360 * that might, for example, cause stations to be added or other
3361 * driver callbacks be invoked.
3363 if (unlikely(local
->quiescing
|| local
->suspended
))
3366 /* We might be during a HW reconfig, prevent Rx for the same reason */
3367 if (unlikely(local
->in_reconfig
))
3371 * The same happens when we're not even started,
3372 * but that's worth a warning.
3374 if (WARN_ON(!local
->started
))
3377 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3379 * Validate the rate, unless a PLCP error means that
3380 * we probably can't have a valid rate here anyway.
3383 if (status
->flag
& RX_FLAG_HT
) {
3385 * rate_idx is MCS index, which can be [0-76]
3388 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3390 * Anything else would be some sort of driver or
3391 * hardware error. The driver should catch hardware
3394 if (WARN(status
->rate_idx
> 76,
3395 "Rate marked as an HT rate but passed "
3396 "status->rate_idx is not "
3397 "an MCS index [0-76]: %d (0x%02x)\n",
3401 } else if (status
->flag
& RX_FLAG_VHT
) {
3402 if (WARN_ONCE(status
->rate_idx
> 9 ||
3404 status
->vht_nss
> 8,
3405 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3406 status
->rate_idx
, status
->vht_nss
))
3409 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3411 rate
= &sband
->bitrates
[status
->rate_idx
];
3415 status
->rx_flags
= 0;
3418 * key references and virtual interfaces are protected using RCU
3419 * and this requires that we are in a read-side RCU section during
3420 * receive processing
3425 * Frames with failed FCS/PLCP checksum are not returned,
3426 * all other frames are returned without radiotap header
3427 * if it was previously present.
3428 * Also, frames with less than 16 bytes are dropped.
3430 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3436 ieee80211_tpt_led_trig_rx(local
,
3437 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3439 __ieee80211_rx_handle_packet(hw
, skb
);
3447 EXPORT_SYMBOL(ieee80211_rx
);
3449 /* This is a version of the rx handler that can be called from hard irq
3450 * context. Post the skb on the queue and schedule the tasklet */
3451 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3453 struct ieee80211_local
*local
= hw_to_local(hw
);
3455 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3457 skb
->pkt_type
= IEEE80211_RX_MSG
;
3458 skb_queue_tail(&local
->skb_queue
, skb
);
3459 tasklet_schedule(&local
->tasklet
);
3461 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);