2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/jiffies.h>
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
36 * monitor mode reception
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
41 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
43 unsigned int rtap_vendor_space
)
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 __pskb_pull(skb
, rtap_vendor_space
);
61 static inline bool should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
,
62 unsigned int rtap_vendor_space
)
64 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
65 struct ieee80211_hdr
*hdr
;
67 hdr
= (void *)(skb
->data
+ rtap_vendor_space
);
69 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
70 RX_FLAG_FAILED_PLCP_CRC
|
71 RX_FLAG_AMPDU_IS_ZEROLEN
))
74 if (unlikely(skb
->len
< 16 + present_fcs_len
+ rtap_vendor_space
))
77 if (ieee80211_is_ctl(hdr
->frame_control
) &&
78 !ieee80211_is_pspoll(hdr
->frame_control
) &&
79 !ieee80211_is_back_req(hdr
->frame_control
))
86 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local
*local
,
87 struct ieee80211_rx_status
*status
,
92 /* always present fields */
93 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
95 /* allocate extra bitmaps */
97 len
+= 4 * hweight8(status
->chains
);
99 if (ieee80211_have_rx_timestamp(status
)) {
103 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
106 /* antenna field, if we don't have per-chain info */
110 /* padding for RX_FLAGS if necessary */
113 if (status
->flag
& RX_FLAG_HT
) /* HT info */
116 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
121 if (status
->flag
& RX_FLAG_VHT
) {
126 if (status
->chains
) {
127 /* antenna and antenna signal fields */
128 len
+= 2 * hweight8(status
->chains
);
131 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
132 struct ieee80211_vendor_radiotap
*rtap
= (void *)skb
->data
;
134 /* vendor presence bitmap */
136 /* alignment for fixed 6-byte vendor data header */
138 /* vendor data header */
140 if (WARN_ON(rtap
->align
== 0))
142 len
= ALIGN(len
, rtap
->align
);
143 len
+= rtap
->len
+ rtap
->pad
;
150 * ieee80211_add_rx_radiotap_header - add radiotap header
152 * add a radiotap header containing all the fields which the hardware provided.
155 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
157 struct ieee80211_rate
*rate
,
158 int rtap_len
, bool has_fcs
)
160 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
161 struct ieee80211_radiotap_header
*rthdr
;
166 u16 channel_flags
= 0;
168 unsigned long chains
= status
->chains
;
169 struct ieee80211_vendor_radiotap rtap
= {};
171 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
172 rtap
= *(struct ieee80211_vendor_radiotap
*)skb
->data
;
173 /* rtap.len and rtap.pad are undone immediately */
174 skb_pull(skb
, sizeof(rtap
) + rtap
.len
+ rtap
.pad
);
178 if (!(has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)))
181 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
182 memset(rthdr
, 0, rtap_len
- rtap
.len
- rtap
.pad
);
183 it_present
= &rthdr
->it_present
;
185 /* radiotap header, set always present flags */
186 rthdr
->it_len
= cpu_to_le16(rtap_len
);
187 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
188 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
189 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
192 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
194 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
196 BIT(IEEE80211_RADIOTAP_EXT
) |
197 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
198 put_unaligned_le32(it_present_val
, it_present
);
200 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
201 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
204 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
205 it_present_val
|= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE
) |
206 BIT(IEEE80211_RADIOTAP_EXT
);
207 put_unaligned_le32(it_present_val
, it_present
);
209 it_present_val
= rtap
.present
;
212 put_unaligned_le32(it_present_val
, it_present
);
214 pos
= (void *)(it_present
+ 1);
216 /* the order of the following fields is important */
218 /* IEEE80211_RADIOTAP_TSFT */
219 if (ieee80211_have_rx_timestamp(status
)) {
221 while ((pos
- (u8
*)rthdr
) & 7)
224 ieee80211_calculate_rx_timestamp(local
, status
,
227 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
231 /* IEEE80211_RADIOTAP_FLAGS */
232 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
233 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
234 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
235 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
236 if (status
->flag
& RX_FLAG_SHORTPRE
)
237 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
240 /* IEEE80211_RADIOTAP_RATE */
241 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
243 * Without rate information don't add it. If we have,
244 * MCS information is a separate field in radiotap,
245 * added below. The byte here is needed as padding
246 * for the channel though, so initialise it to 0.
251 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
252 if (status
->flag
& RX_FLAG_10MHZ
)
254 else if (status
->flag
& RX_FLAG_5MHZ
)
256 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
260 /* IEEE80211_RADIOTAP_CHANNEL */
261 put_unaligned_le16(status
->freq
, pos
);
263 if (status
->flag
& RX_FLAG_10MHZ
)
264 channel_flags
|= IEEE80211_CHAN_HALF
;
265 else if (status
->flag
& RX_FLAG_5MHZ
)
266 channel_flags
|= IEEE80211_CHAN_QUARTER
;
268 if (status
->band
== IEEE80211_BAND_5GHZ
)
269 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
270 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
271 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
272 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
273 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
275 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
277 channel_flags
|= IEEE80211_CHAN_2GHZ
;
278 put_unaligned_le16(channel_flags
, pos
);
281 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
282 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
283 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
284 *pos
= status
->signal
;
286 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
290 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
292 if (!status
->chains
) {
293 /* IEEE80211_RADIOTAP_ANTENNA */
294 *pos
= status
->antenna
;
298 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
300 /* IEEE80211_RADIOTAP_RX_FLAGS */
301 /* ensure 2 byte alignment for the 2 byte field as required */
302 if ((pos
- (u8
*)rthdr
) & 1)
304 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
305 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
306 put_unaligned_le16(rx_flags
, pos
);
309 if (status
->flag
& RX_FLAG_HT
) {
312 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
313 *pos
++ = local
->hw
.radiotap_mcs_details
;
315 if (status
->flag
& RX_FLAG_SHORT_GI
)
316 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
317 if (status
->flag
& RX_FLAG_40MHZ
)
318 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
319 if (status
->flag
& RX_FLAG_HT_GF
)
320 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
321 if (status
->flag
& RX_FLAG_LDPC
)
322 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
323 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
324 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
326 *pos
++ = status
->rate_idx
;
329 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
332 /* ensure 4 byte alignment */
333 while ((pos
- (u8
*)rthdr
) & 3)
336 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
337 put_unaligned_le32(status
->ampdu_reference
, pos
);
339 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
340 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
341 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
342 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
343 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
344 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
345 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
346 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
347 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
348 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
349 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
350 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
351 put_unaligned_le16(flags
, pos
);
353 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
354 *pos
++ = status
->ampdu_delimiter_crc
;
360 if (status
->flag
& RX_FLAG_VHT
) {
361 u16 known
= local
->hw
.radiotap_vht_details
;
363 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
364 /* known field - how to handle 80+80? */
365 if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
366 known
&= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
;
367 put_unaligned_le16(known
, pos
);
370 if (status
->flag
& RX_FLAG_SHORT_GI
)
371 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
372 /* in VHT, STBC is binary */
373 if (status
->flag
& RX_FLAG_STBC_MASK
)
374 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
375 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
376 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
379 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
381 else if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
382 *pos
++ = 0; /* marked not known above */
383 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
385 else if (status
->flag
& RX_FLAG_40MHZ
)
390 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
393 if (status
->flag
& RX_FLAG_LDPC
)
394 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
402 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
403 *pos
++ = status
->chain_signal
[chain
];
407 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
408 /* ensure 2 byte alignment for the vendor field as required */
409 if ((pos
- (u8
*)rthdr
) & 1)
411 *pos
++ = rtap
.oui
[0];
412 *pos
++ = rtap
.oui
[1];
413 *pos
++ = rtap
.oui
[2];
415 put_unaligned_le16(rtap
.len
, pos
);
417 /* align the actual payload as requested */
418 while ((pos
- (u8
*)rthdr
) & (rtap
.align
- 1))
420 /* data (and possible padding) already follows */
425 * This function copies a received frame to all monitor interfaces and
426 * returns a cleaned-up SKB that no longer includes the FCS nor the
427 * radiotap header the driver might have added.
429 static struct sk_buff
*
430 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
431 struct ieee80211_rate
*rate
)
433 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
434 struct ieee80211_sub_if_data
*sdata
;
435 int rt_hdrlen
, needed_headroom
;
436 struct sk_buff
*skb
, *skb2
;
437 struct net_device
*prev_dev
= NULL
;
438 int present_fcs_len
= 0;
439 unsigned int rtap_vendor_space
= 0;
441 if (unlikely(status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
)) {
442 struct ieee80211_vendor_radiotap
*rtap
= (void *)origskb
->data
;
444 rtap_vendor_space
= sizeof(*rtap
) + rtap
->len
+ rtap
->pad
;
448 * First, we may need to make a copy of the skb because
449 * (1) we need to modify it for radiotap (if not present), and
450 * (2) the other RX handlers will modify the skb we got.
452 * We don't need to, of course, if we aren't going to return
453 * the SKB because it has a bad FCS/PLCP checksum.
456 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
457 present_fcs_len
= FCS_LEN
;
459 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
460 if (!pskb_may_pull(origskb
, 2 + rtap_vendor_space
)) {
461 dev_kfree_skb(origskb
);
465 if (!local
->monitors
) {
466 if (should_drop_frame(origskb
, present_fcs_len
,
467 rtap_vendor_space
)) {
468 dev_kfree_skb(origskb
);
472 return remove_monitor_info(local
, origskb
, rtap_vendor_space
);
475 /* room for the radiotap header based on driver features */
476 rt_hdrlen
= ieee80211_rx_radiotap_hdrlen(local
, status
, origskb
);
477 needed_headroom
= rt_hdrlen
- rtap_vendor_space
;
479 if (should_drop_frame(origskb
, present_fcs_len
, rtap_vendor_space
)) {
480 /* only need to expand headroom if necessary */
485 * This shouldn't trigger often because most devices have an
486 * RX header they pull before we get here, and that should
487 * be big enough for our radiotap information. We should
488 * probably export the length to drivers so that we can have
489 * them allocate enough headroom to start with.
491 if (skb_headroom(skb
) < needed_headroom
&&
492 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
498 * Need to make a copy and possibly remove radiotap header
499 * and FCS from the original.
501 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
503 origskb
= remove_monitor_info(local
, origskb
,
510 /* prepend radiotap information */
511 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, rt_hdrlen
, true);
513 skb_reset_mac_header(skb
);
514 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
515 skb
->pkt_type
= PACKET_OTHERHOST
;
516 skb
->protocol
= htons(ETH_P_802_2
);
518 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
519 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
522 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
525 if (!ieee80211_sdata_running(sdata
))
529 skb2
= skb_clone(skb
, GFP_ATOMIC
);
531 skb2
->dev
= prev_dev
;
532 netif_receive_skb(skb2
);
536 prev_dev
= sdata
->dev
;
537 sdata
->dev
->stats
.rx_packets
++;
538 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
543 netif_receive_skb(skb
);
550 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
552 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
553 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
554 int tid
, seqno_idx
, security_idx
;
556 /* does the frame have a qos control field? */
557 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
558 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
559 /* frame has qos control */
560 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
561 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
562 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
568 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
570 * Sequence numbers for management frames, QoS data
571 * frames with a broadcast/multicast address in the
572 * Address 1 field, and all non-QoS data frames sent
573 * by QoS STAs are assigned using an additional single
574 * modulo-4096 counter, [...]
576 * We also use that counter for non-QoS STAs.
578 seqno_idx
= IEEE80211_NUM_TIDS
;
580 if (ieee80211_is_mgmt(hdr
->frame_control
))
581 security_idx
= IEEE80211_NUM_TIDS
;
585 rx
->seqno_idx
= seqno_idx
;
586 rx
->security_idx
= security_idx
;
587 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
588 * For now, set skb->priority to 0 for other cases. */
589 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
593 * DOC: Packet alignment
595 * Drivers always need to pass packets that are aligned to two-byte boundaries
598 * Additionally, should, if possible, align the payload data in a way that
599 * guarantees that the contained IP header is aligned to a four-byte
600 * boundary. In the case of regular frames, this simply means aligning the
601 * payload to a four-byte boundary (because either the IP header is directly
602 * contained, or IV/RFC1042 headers that have a length divisible by four are
603 * in front of it). If the payload data is not properly aligned and the
604 * architecture doesn't support efficient unaligned operations, mac80211
605 * will align the data.
607 * With A-MSDU frames, however, the payload data address must yield two modulo
608 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
609 * push the IP header further back to a multiple of four again. Thankfully, the
610 * specs were sane enough this time around to require padding each A-MSDU
611 * subframe to a length that is a multiple of four.
613 * Padding like Atheros hardware adds which is between the 802.11 header and
614 * the payload is not supported, the driver is required to move the 802.11
615 * header to be directly in front of the payload in that case.
617 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
619 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
620 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
621 "unaligned packet at 0x%p\n", rx
->skb
->data
);
628 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
630 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
632 if (is_multicast_ether_addr(hdr
->addr1
))
635 return ieee80211_is_robust_mgmt_frame(skb
);
639 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
641 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
643 if (!is_multicast_ether_addr(hdr
->addr1
))
646 return ieee80211_is_robust_mgmt_frame(skb
);
650 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
651 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
653 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
654 struct ieee80211_mmie
*mmie
;
656 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
659 if (!ieee80211_is_robust_mgmt_frame(skb
))
660 return -1; /* not a robust management frame */
662 mmie
= (struct ieee80211_mmie
*)
663 (skb
->data
+ skb
->len
- sizeof(*mmie
));
664 if (mmie
->element_id
!= WLAN_EID_MMIE
||
665 mmie
->length
!= sizeof(*mmie
) - 2)
668 return le16_to_cpu(mmie
->key_id
);
671 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
674 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
679 fc
= hdr
->frame_control
;
680 hdrlen
= ieee80211_hdrlen(fc
);
682 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
685 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
686 keyid
&= cs
->key_idx_mask
;
687 keyid
>>= cs
->key_idx_shift
;
692 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
694 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
695 char *dev_addr
= rx
->sdata
->vif
.addr
;
697 if (ieee80211_is_data(hdr
->frame_control
)) {
698 if (is_multicast_ether_addr(hdr
->addr1
)) {
699 if (ieee80211_has_tods(hdr
->frame_control
) ||
700 !ieee80211_has_fromds(hdr
->frame_control
))
701 return RX_DROP_MONITOR
;
702 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
703 return RX_DROP_MONITOR
;
705 if (!ieee80211_has_a4(hdr
->frame_control
))
706 return RX_DROP_MONITOR
;
707 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
708 return RX_DROP_MONITOR
;
712 /* If there is not an established peer link and this is not a peer link
713 * establisment frame, beacon or probe, drop the frame.
716 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
717 struct ieee80211_mgmt
*mgmt
;
719 if (!ieee80211_is_mgmt(hdr
->frame_control
))
720 return RX_DROP_MONITOR
;
722 if (ieee80211_is_action(hdr
->frame_control
)) {
725 /* make sure category field is present */
726 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
727 return RX_DROP_MONITOR
;
729 mgmt
= (struct ieee80211_mgmt
*)hdr
;
730 category
= mgmt
->u
.action
.category
;
731 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
732 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
733 return RX_DROP_MONITOR
;
737 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
738 ieee80211_is_probe_resp(hdr
->frame_control
) ||
739 ieee80211_is_beacon(hdr
->frame_control
) ||
740 ieee80211_is_auth(hdr
->frame_control
))
743 return RX_DROP_MONITOR
;
749 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
750 struct tid_ampdu_rx
*tid_agg_rx
,
752 struct sk_buff_head
*frames
)
754 struct sk_buff_head
*skb_list
= &tid_agg_rx
->reorder_buf
[index
];
756 struct ieee80211_rx_status
*status
;
758 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
760 if (skb_queue_empty(skb_list
))
763 if (!ieee80211_rx_reorder_ready(skb_list
)) {
764 __skb_queue_purge(skb_list
);
768 /* release frames from the reorder ring buffer */
769 tid_agg_rx
->stored_mpdu_num
--;
770 while ((skb
= __skb_dequeue(skb_list
))) {
771 status
= IEEE80211_SKB_RXCB(skb
);
772 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
773 __skb_queue_tail(frames
, skb
);
777 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
780 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
781 struct tid_ampdu_rx
*tid_agg_rx
,
783 struct sk_buff_head
*frames
)
787 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
789 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
790 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
791 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
797 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
798 * the skb was added to the buffer longer than this time ago, the earlier
799 * frames that have not yet been received are assumed to be lost and the skb
800 * can be released for processing. This may also release other skb's from the
801 * reorder buffer if there are no additional gaps between the frames.
803 * Callers must hold tid_agg_rx->reorder_lock.
805 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
807 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
808 struct tid_ampdu_rx
*tid_agg_rx
,
809 struct sk_buff_head
*frames
)
813 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
815 /* release the buffer until next missing frame */
816 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
817 if (!ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
]) &&
818 tid_agg_rx
->stored_mpdu_num
) {
820 * No buffers ready to be released, but check whether any
821 * frames in the reorder buffer have timed out.
824 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
825 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
826 if (!ieee80211_rx_reorder_ready(
827 &tid_agg_rx
->reorder_buf
[j
])) {
832 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
833 HT_RX_REORDER_BUF_TIMEOUT
))
834 goto set_release_timer
;
836 /* don't leave incomplete A-MSDUs around */
837 for (i
= (index
+ 1) % tid_agg_rx
->buf_size
; i
!= j
;
838 i
= (i
+ 1) % tid_agg_rx
->buf_size
)
839 __skb_queue_purge(&tid_agg_rx
->reorder_buf
[i
]);
841 ht_dbg_ratelimited(sdata
,
842 "release an RX reorder frame due to timeout on earlier frames\n");
843 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
847 * Increment the head seq# also for the skipped slots.
849 tid_agg_rx
->head_seq_num
=
850 (tid_agg_rx
->head_seq_num
+
851 skipped
) & IEEE80211_SN_MASK
;
854 } else while (ieee80211_rx_reorder_ready(
855 &tid_agg_rx
->reorder_buf
[index
])) {
856 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
858 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
861 if (tid_agg_rx
->stored_mpdu_num
) {
862 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
864 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
865 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
866 if (ieee80211_rx_reorder_ready(
867 &tid_agg_rx
->reorder_buf
[j
]))
873 mod_timer(&tid_agg_rx
->reorder_timer
,
874 tid_agg_rx
->reorder_time
[j
] + 1 +
875 HT_RX_REORDER_BUF_TIMEOUT
);
877 del_timer(&tid_agg_rx
->reorder_timer
);
882 * As this function belongs to the RX path it must be under
883 * rcu_read_lock protection. It returns false if the frame
884 * can be processed immediately, true if it was consumed.
886 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
887 struct tid_ampdu_rx
*tid_agg_rx
,
889 struct sk_buff_head
*frames
)
891 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
892 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
893 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
894 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
895 u16 head_seq_num
, buf_size
;
899 spin_lock(&tid_agg_rx
->reorder_lock
);
902 * Offloaded BA sessions have no known starting sequence number so pick
903 * one from first Rxed frame for this tid after BA was started.
905 if (unlikely(tid_agg_rx
->auto_seq
)) {
906 tid_agg_rx
->auto_seq
= false;
907 tid_agg_rx
->ssn
= mpdu_seq_num
;
908 tid_agg_rx
->head_seq_num
= mpdu_seq_num
;
911 buf_size
= tid_agg_rx
->buf_size
;
912 head_seq_num
= tid_agg_rx
->head_seq_num
;
914 /* frame with out of date sequence number */
915 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
921 * If frame the sequence number exceeds our buffering window
922 * size release some previous frames to make room for this one.
924 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
925 head_seq_num
= ieee80211_sn_inc(
926 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
927 /* release stored frames up to new head to stack */
928 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
929 head_seq_num
, frames
);
932 /* Now the new frame is always in the range of the reordering buffer */
934 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
936 /* check if we already stored this frame */
937 if (ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
])) {
943 * If the current MPDU is in the right order and nothing else
944 * is stored we can process it directly, no need to buffer it.
945 * If it is first but there's something stored, we may be able
946 * to release frames after this one.
948 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
949 tid_agg_rx
->stored_mpdu_num
== 0) {
950 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
))
951 tid_agg_rx
->head_seq_num
=
952 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
957 /* put the frame in the reordering buffer */
958 __skb_queue_tail(&tid_agg_rx
->reorder_buf
[index
], skb
);
959 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
960 tid_agg_rx
->reorder_time
[index
] = jiffies
;
961 tid_agg_rx
->stored_mpdu_num
++;
962 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
966 spin_unlock(&tid_agg_rx
->reorder_lock
);
971 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
972 * true if the MPDU was buffered, false if it should be processed.
974 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
975 struct sk_buff_head
*frames
)
977 struct sk_buff
*skb
= rx
->skb
;
978 struct ieee80211_local
*local
= rx
->local
;
979 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
980 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
981 struct sta_info
*sta
= rx
->sta
;
982 struct tid_ampdu_rx
*tid_agg_rx
;
986 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
987 is_multicast_ether_addr(hdr
->addr1
))
991 * filter the QoS data rx stream according to
992 * STA/TID and check if this STA/TID is on aggregation
998 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
999 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
1000 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1002 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
1006 /* qos null data frames are excluded */
1007 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
1010 /* not part of a BA session */
1011 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
1012 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
1015 /* not actually part of this BA session */
1016 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1019 /* new, potentially un-ordered, ampdu frame - process it */
1021 /* reset session timer */
1022 if (tid_agg_rx
->timeout
)
1023 tid_agg_rx
->last_rx
= jiffies
;
1025 /* if this mpdu is fragmented - terminate rx aggregation session */
1026 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1027 if (sc
& IEEE80211_SCTL_FRAG
) {
1028 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
1029 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
1030 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
1035 * No locking needed -- we will only ever process one
1036 * RX packet at a time, and thus own tid_agg_rx. All
1037 * other code manipulating it needs to (and does) make
1038 * sure that we cannot get to it any more before doing
1041 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
1046 __skb_queue_tail(frames
, skb
);
1049 static ieee80211_rx_result debug_noinline
1050 ieee80211_rx_h_check_dup(struct ieee80211_rx_data
*rx
)
1052 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1053 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1056 * Drop duplicate 802.11 retransmissions
1057 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1060 if (rx
->skb
->len
< 24)
1063 if (ieee80211_is_ctl(hdr
->frame_control
) ||
1064 ieee80211_is_qos_nullfunc(hdr
->frame_control
) ||
1065 is_multicast_ether_addr(hdr
->addr1
))
1069 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1070 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
1072 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1073 rx
->local
->dot11FrameDuplicateCount
++;
1074 rx
->sta
->num_duplicates
++;
1076 return RX_DROP_UNUSABLE
;
1077 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1078 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1085 static ieee80211_rx_result debug_noinline
1086 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
1088 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1090 if (unlikely(rx
->skb
->len
< 16)) {
1091 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
1092 return RX_DROP_MONITOR
;
1095 /* Drop disallowed frame classes based on STA auth/assoc state;
1096 * IEEE 802.11, Chap 5.5.
1098 * mac80211 filters only based on association state, i.e. it drops
1099 * Class 3 frames from not associated stations. hostapd sends
1100 * deauth/disassoc frames when needed. In addition, hostapd is
1101 * responsible for filtering on both auth and assoc states.
1104 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1105 return ieee80211_rx_mesh_check(rx
);
1107 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1108 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1109 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1110 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1111 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
1112 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1114 * accept port control frames from the AP even when it's not
1115 * yet marked ASSOC to prevent a race where we don't set the
1116 * assoc bit quickly enough before it sends the first frame
1118 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1119 ieee80211_is_data_present(hdr
->frame_control
)) {
1120 unsigned int hdrlen
;
1123 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1125 if (rx
->skb
->len
< hdrlen
+ 8)
1126 return RX_DROP_MONITOR
;
1128 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1129 if (ethertype
== rx
->sdata
->control_port_protocol
)
1133 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1134 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1137 return RX_DROP_UNUSABLE
;
1139 return RX_DROP_MONITOR
;
1146 static ieee80211_rx_result debug_noinline
1147 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1149 struct ieee80211_local
*local
;
1150 struct ieee80211_hdr
*hdr
;
1151 struct sk_buff
*skb
;
1155 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1157 if (!local
->pspolling
)
1160 if (!ieee80211_has_fromds(hdr
->frame_control
))
1161 /* this is not from AP */
1164 if (!ieee80211_is_data(hdr
->frame_control
))
1167 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1168 /* AP has no more frames buffered for us */
1169 local
->pspolling
= false;
1173 /* more data bit is set, let's request a new frame from the AP */
1174 ieee80211_send_pspoll(local
, rx
->sdata
);
1179 static void sta_ps_start(struct sta_info
*sta
)
1181 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1182 struct ieee80211_local
*local
= sdata
->local
;
1185 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1186 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1187 ps
= &sdata
->bss
->ps
;
1191 atomic_inc(&ps
->num_sta_ps
);
1192 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1193 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1194 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1195 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1196 sta
->sta
.addr
, sta
->sta
.aid
);
1199 static void sta_ps_end(struct sta_info
*sta
)
1201 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1202 sta
->sta
.addr
, sta
->sta
.aid
);
1204 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1206 * Clear the flag only if the other one is still set
1207 * so that the TX path won't start TX'ing new frames
1208 * directly ... In the case that the driver flag isn't
1209 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1211 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1212 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1213 sta
->sta
.addr
, sta
->sta
.aid
);
1217 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1218 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1219 ieee80211_sta_ps_deliver_wakeup(sta
);
1222 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1224 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1227 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1229 /* Don't let the same PS state be set twice */
1230 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1231 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1235 sta_ps_start(sta_inf
);
1237 sta_ps_end(sta_inf
);
1241 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1243 static ieee80211_rx_result debug_noinline
1244 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1246 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1247 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1248 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1251 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1254 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1255 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1259 * The device handles station powersave, so don't do anything about
1260 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1261 * it to mac80211 since they're handled.)
1263 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1267 * Don't do anything if the station isn't already asleep. In
1268 * the uAPSD case, the station will probably be marked asleep,
1269 * in the PS-Poll case the station must be confused ...
1271 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1274 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1275 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1276 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1277 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1279 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1282 /* Free PS Poll skb here instead of returning RX_DROP that would
1283 * count as an dropped frame. */
1284 dev_kfree_skb(rx
->skb
);
1287 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1288 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1289 ieee80211_has_pm(hdr
->frame_control
) &&
1290 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1291 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1292 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1293 ac
= ieee802_1d_to_ac
[tid
& 7];
1296 * If this AC is not trigger-enabled do nothing.
1298 * NB: This could/should check a separate bitmap of trigger-
1299 * enabled queues, but for now we only implement uAPSD w/o
1300 * TSPEC changes to the ACs, so they're always the same.
1302 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1305 /* if we are in a service period, do nothing */
1306 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1309 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1310 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1312 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1318 static ieee80211_rx_result debug_noinline
1319 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1321 struct sta_info
*sta
= rx
->sta
;
1322 struct sk_buff
*skb
= rx
->skb
;
1323 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1324 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1331 * Update last_rx only for IBSS packets which are for the current
1332 * BSSID and for station already AUTHORIZED to avoid keeping the
1333 * current IBSS network alive in cases where other STAs start
1334 * using different BSSID. This will also give the station another
1335 * chance to restart the authentication/authorization in case
1336 * something went wrong the first time.
1338 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1339 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1340 NL80211_IFTYPE_ADHOC
);
1341 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1342 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1343 sta
->last_rx
= jiffies
;
1344 if (ieee80211_is_data(hdr
->frame_control
) &&
1345 !is_multicast_ether_addr(hdr
->addr1
)) {
1346 sta
->last_rx_rate_idx
= status
->rate_idx
;
1347 sta
->last_rx_rate_flag
= status
->flag
;
1348 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1349 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1352 } else if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
) {
1353 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1354 NL80211_IFTYPE_OCB
);
1355 /* OCB uses wild-card BSSID */
1356 if (is_broadcast_ether_addr(bssid
))
1357 sta
->last_rx
= jiffies
;
1358 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1360 * Mesh beacons will update last_rx when if they are found to
1361 * match the current local configuration when processed.
1363 sta
->last_rx
= jiffies
;
1364 if (ieee80211_is_data(hdr
->frame_control
)) {
1365 sta
->last_rx_rate_idx
= status
->rate_idx
;
1366 sta
->last_rx_rate_flag
= status
->flag
;
1367 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1368 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1372 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1375 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1376 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1378 sta
->rx_fragments
++;
1379 sta
->rx_bytes
+= rx
->skb
->len
;
1380 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1381 sta
->last_signal
= status
->signal
;
1382 ewma_add(&sta
->avg_signal
, -status
->signal
);
1385 if (status
->chains
) {
1386 sta
->chains
= status
->chains
;
1387 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1388 int signal
= status
->chain_signal
[i
];
1390 if (!(status
->chains
& BIT(i
)))
1393 sta
->chain_signal_last
[i
] = signal
;
1394 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1399 * Change STA power saving mode only at the end of a frame
1400 * exchange sequence.
1402 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1403 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1404 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1405 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1406 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1407 /* PM bit is only checked in frames where it isn't reserved,
1408 * in AP mode it's reserved in non-bufferable management frames
1409 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1411 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1412 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1413 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1414 if (!ieee80211_has_pm(hdr
->frame_control
))
1417 if (ieee80211_has_pm(hdr
->frame_control
))
1422 /* mesh power save support */
1423 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1424 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1427 * Drop (qos-)data::nullfunc frames silently, since they
1428 * are used only to control station power saving mode.
1430 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1431 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1432 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1435 * If we receive a 4-addr nullfunc frame from a STA
1436 * that was not moved to a 4-addr STA vlan yet send
1437 * the event to userspace and for older hostapd drop
1438 * the frame to the monitor interface.
1440 if (ieee80211_has_a4(hdr
->frame_control
) &&
1441 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1442 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1443 !rx
->sdata
->u
.vlan
.sta
))) {
1444 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1445 cfg80211_rx_unexpected_4addr_frame(
1446 rx
->sdata
->dev
, sta
->sta
.addr
,
1448 return RX_DROP_MONITOR
;
1451 * Update counter and free packet here to avoid
1452 * counting this as a dropped packed.
1455 dev_kfree_skb(rx
->skb
);
1460 } /* ieee80211_rx_h_sta_process */
1462 static ieee80211_rx_result debug_noinline
1463 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1465 struct sk_buff
*skb
= rx
->skb
;
1466 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1467 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1470 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1471 struct ieee80211_key
*sta_ptk
= NULL
;
1472 int mmie_keyidx
= -1;
1474 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1479 * There are four types of keys:
1480 * - GTK (group keys)
1481 * - IGTK (group keys for management frames)
1482 * - PTK (pairwise keys)
1483 * - STK (station-to-station pairwise keys)
1485 * When selecting a key, we have to distinguish between multicast
1486 * (including broadcast) and unicast frames, the latter can only
1487 * use PTKs and STKs while the former always use GTKs and IGTKs.
1488 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1489 * unicast frames can also use key indices like GTKs. Hence, if we
1490 * don't have a PTK/STK we check the key index for a WEP key.
1492 * Note that in a regular BSS, multicast frames are sent by the
1493 * AP only, associated stations unicast the frame to the AP first
1494 * which then multicasts it on their behalf.
1496 * There is also a slight problem in IBSS mode: GTKs are negotiated
1497 * with each station, that is something we don't currently handle.
1498 * The spec seems to expect that one negotiates the same key with
1499 * every station but there's no such requirement; VLANs could be
1504 * No point in finding a key and decrypting if the frame is neither
1505 * addressed to us nor a multicast frame.
1507 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1510 /* start without a key */
1512 fc
= hdr
->frame_control
;
1515 int keyid
= rx
->sta
->ptk_idx
;
1517 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1518 cs
= rx
->sta
->cipher_scheme
;
1519 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1520 if (unlikely(keyid
< 0))
1521 return RX_DROP_UNUSABLE
;
1523 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1526 if (!ieee80211_has_protected(fc
))
1527 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1529 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1531 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1532 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1534 /* Skip decryption if the frame is not protected. */
1535 if (!ieee80211_has_protected(fc
))
1537 } else if (mmie_keyidx
>= 0) {
1538 /* Broadcast/multicast robust management frame / BIP */
1539 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1540 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1543 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1544 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1545 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1547 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1549 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1550 } else if (!ieee80211_has_protected(fc
)) {
1552 * The frame was not protected, so skip decryption. However, we
1553 * need to set rx->key if there is a key that could have been
1554 * used so that the frame may be dropped if encryption would
1555 * have been expected.
1557 struct ieee80211_key
*key
= NULL
;
1558 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1561 if (ieee80211_is_mgmt(fc
) &&
1562 is_multicast_ether_addr(hdr
->addr1
) &&
1563 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1567 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1568 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1574 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1575 key
= rcu_dereference(sdata
->keys
[i
]);
1588 * The device doesn't give us the IV so we won't be
1589 * able to look up the key. That's ok though, we
1590 * don't need to decrypt the frame, we just won't
1591 * be able to keep statistics accurate.
1592 * Except for key threshold notifications, should
1593 * we somehow allow the driver to tell us which key
1594 * the hardware used if this flag is set?
1596 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1597 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1600 hdrlen
= ieee80211_hdrlen(fc
);
1603 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1605 if (unlikely(keyidx
< 0))
1606 return RX_DROP_UNUSABLE
;
1608 if (rx
->skb
->len
< 8 + hdrlen
)
1609 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1611 * no need to call ieee80211_wep_get_keyidx,
1612 * it verifies a bunch of things we've done already
1614 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1615 keyidx
= keyid
>> 6;
1618 /* check per-station GTK first, if multicast packet */
1619 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1620 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1622 /* if not found, try default key */
1624 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1627 * RSNA-protected unicast frames should always be
1628 * sent with pairwise or station-to-station keys,
1629 * but for WEP we allow using a key index as well.
1632 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1633 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1634 !is_multicast_ether_addr(hdr
->addr1
))
1640 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1641 return RX_DROP_MONITOR
;
1643 rx
->key
->tx_rx_count
++;
1644 /* TODO: add threshold stuff again */
1646 return RX_DROP_MONITOR
;
1649 switch (rx
->key
->conf
.cipher
) {
1650 case WLAN_CIPHER_SUITE_WEP40
:
1651 case WLAN_CIPHER_SUITE_WEP104
:
1652 result
= ieee80211_crypto_wep_decrypt(rx
);
1654 case WLAN_CIPHER_SUITE_TKIP
:
1655 result
= ieee80211_crypto_tkip_decrypt(rx
);
1657 case WLAN_CIPHER_SUITE_CCMP
:
1658 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1660 case WLAN_CIPHER_SUITE_AES_CMAC
:
1661 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1664 result
= ieee80211_crypto_hw_decrypt(rx
);
1667 /* the hdr variable is invalid after the decrypt handlers */
1669 /* either the frame has been decrypted or will be dropped */
1670 status
->flag
|= RX_FLAG_DECRYPTED
;
1675 static inline struct ieee80211_fragment_entry
*
1676 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1677 unsigned int frag
, unsigned int seq
, int rx_queue
,
1678 struct sk_buff
**skb
)
1680 struct ieee80211_fragment_entry
*entry
;
1682 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1683 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1684 sdata
->fragment_next
= 0;
1686 if (!skb_queue_empty(&entry
->skb_list
))
1687 __skb_queue_purge(&entry
->skb_list
);
1689 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1691 entry
->first_frag_time
= jiffies
;
1693 entry
->rx_queue
= rx_queue
;
1694 entry
->last_frag
= frag
;
1696 entry
->extra_len
= 0;
1701 static inline struct ieee80211_fragment_entry
*
1702 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1703 unsigned int frag
, unsigned int seq
,
1704 int rx_queue
, struct ieee80211_hdr
*hdr
)
1706 struct ieee80211_fragment_entry
*entry
;
1709 idx
= sdata
->fragment_next
;
1710 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1711 struct ieee80211_hdr
*f_hdr
;
1715 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1717 entry
= &sdata
->fragments
[idx
];
1718 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1719 entry
->rx_queue
!= rx_queue
||
1720 entry
->last_frag
+ 1 != frag
)
1723 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1726 * Check ftype and addresses are equal, else check next fragment
1728 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1729 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1730 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1731 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1734 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1735 __skb_queue_purge(&entry
->skb_list
);
1744 static ieee80211_rx_result debug_noinline
1745 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1747 struct ieee80211_hdr
*hdr
;
1750 unsigned int frag
, seq
;
1751 struct ieee80211_fragment_entry
*entry
;
1752 struct sk_buff
*skb
;
1753 struct ieee80211_rx_status
*status
;
1755 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1756 fc
= hdr
->frame_control
;
1758 if (ieee80211_is_ctl(fc
))
1761 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1762 frag
= sc
& IEEE80211_SCTL_FRAG
;
1764 if (likely(!ieee80211_has_morefrags(fc
) && frag
== 0))
1767 if (is_multicast_ether_addr(hdr
->addr1
)) {
1768 rx
->local
->dot11MulticastReceivedFrameCount
++;
1772 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1774 if (skb_linearize(rx
->skb
))
1775 return RX_DROP_UNUSABLE
;
1778 * skb_linearize() might change the skb->data and
1779 * previously cached variables (in this case, hdr) need to
1780 * be refreshed with the new data.
1782 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1783 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1786 /* This is the first fragment of a new frame. */
1787 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1788 rx
->seqno_idx
, &(rx
->skb
));
1789 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1790 ieee80211_has_protected(fc
)) {
1791 int queue
= rx
->security_idx
;
1792 /* Store CCMP PN so that we can verify that the next
1793 * fragment has a sequential PN value. */
1795 memcpy(entry
->last_pn
,
1796 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1797 IEEE80211_CCMP_PN_LEN
);
1802 /* This is a fragment for a frame that should already be pending in
1803 * fragment cache. Add this fragment to the end of the pending entry.
1805 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1806 rx
->seqno_idx
, hdr
);
1808 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1809 return RX_DROP_MONITOR
;
1812 /* Verify that MPDUs within one MSDU have sequential PN values.
1813 * (IEEE 802.11i, 8.3.3.4.5) */
1816 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1818 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1819 return RX_DROP_UNUSABLE
;
1820 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1821 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1826 queue
= rx
->security_idx
;
1827 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1828 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1829 return RX_DROP_UNUSABLE
;
1830 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1833 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1834 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1835 entry
->last_frag
= frag
;
1836 entry
->extra_len
+= rx
->skb
->len
;
1837 if (ieee80211_has_morefrags(fc
)) {
1842 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1843 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1844 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1845 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1847 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1848 __skb_queue_purge(&entry
->skb_list
);
1849 return RX_DROP_UNUSABLE
;
1852 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1853 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1857 /* Complete frame has been reassembled - process it now */
1858 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1859 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1863 rx
->sta
->rx_packets
++;
1864 ieee80211_led_rx(rx
->local
);
1868 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1870 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1876 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1878 struct sk_buff
*skb
= rx
->skb
;
1879 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1882 * Pass through unencrypted frames if the hardware has
1883 * decrypted them already.
1885 if (status
->flag
& RX_FLAG_DECRYPTED
)
1888 /* Drop unencrypted frames if key is set. */
1889 if (unlikely(!ieee80211_has_protected(fc
) &&
1890 !ieee80211_is_nullfunc(fc
) &&
1891 ieee80211_is_data(fc
) &&
1892 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1898 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1900 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1901 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1902 __le16 fc
= hdr
->frame_control
;
1905 * Pass through unencrypted frames if the hardware has
1906 * decrypted them already.
1908 if (status
->flag
& RX_FLAG_DECRYPTED
)
1911 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1912 if (unlikely(!ieee80211_has_protected(fc
) &&
1913 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1915 if (ieee80211_is_deauth(fc
) ||
1916 ieee80211_is_disassoc(fc
))
1917 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1922 /* BIP does not use Protected field, so need to check MMIE */
1923 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1924 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1925 if (ieee80211_is_deauth(fc
) ||
1926 ieee80211_is_disassoc(fc
))
1927 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1933 * When using MFP, Action frames are not allowed prior to
1934 * having configured keys.
1936 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1937 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
1945 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1947 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1948 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1949 bool check_port_control
= false;
1950 struct ethhdr
*ehdr
;
1953 *port_control
= false;
1954 if (ieee80211_has_a4(hdr
->frame_control
) &&
1955 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1958 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1959 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1961 if (!sdata
->u
.mgd
.use_4addr
)
1964 check_port_control
= true;
1967 if (is_multicast_ether_addr(hdr
->addr1
) &&
1968 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1971 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1975 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1976 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1977 *port_control
= true;
1978 else if (check_port_control
)
1985 * requires that rx->skb is a frame with ethernet header
1987 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1989 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1990 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1991 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1994 * Allow EAPOL frames to us/the PAE group address regardless
1995 * of whether the frame was encrypted or not.
1997 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1998 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1999 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
2002 if (ieee80211_802_1x_port_control(rx
) ||
2003 ieee80211_drop_unencrypted(rx
, fc
))
2010 * requires that rx->skb is a frame with ethernet header
2013 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
2015 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2016 struct net_device
*dev
= sdata
->dev
;
2017 struct sk_buff
*skb
, *xmit_skb
;
2018 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2019 struct sta_info
*dsta
;
2020 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2025 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2026 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
2027 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
2028 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
2029 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
2030 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
2032 * send multicast frames both to higher layers in
2033 * local net stack and back to the wireless medium
2035 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
2037 net_info_ratelimited("%s: failed to clone multicast frame\n",
2040 dsta
= sta_info_get(sdata
, skb
->data
);
2043 * The destination station is associated to
2044 * this AP (in this VLAN), so send the frame
2045 * directly to it and do not pass it to local
2054 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2056 /* 'align' will only take the values 0 or 2 here since all
2057 * frames are required to be aligned to 2-byte boundaries
2058 * when being passed to mac80211; the code here works just
2059 * as well if that isn't true, but mac80211 assumes it can
2060 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2064 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
2066 if (WARN_ON(skb_headroom(skb
) < 3)) {
2070 u8
*data
= skb
->data
;
2071 size_t len
= skb_headlen(skb
);
2073 memmove(skb
->data
, data
, len
);
2074 skb_set_tail_pointer(skb
, len
);
2081 /* deliver to local stack */
2082 skb
->protocol
= eth_type_trans(skb
, dev
);
2083 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2084 if (rx
->local
->napi
)
2085 napi_gro_receive(rx
->local
->napi
, skb
);
2087 netif_receive_skb(skb
);
2092 * Send to wireless media and increase priority by 256 to
2093 * keep the received priority instead of reclassifying
2094 * the frame (see cfg80211_classify8021d).
2096 xmit_skb
->priority
+= 256;
2097 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2098 skb_reset_network_header(xmit_skb
);
2099 skb_reset_mac_header(xmit_skb
);
2100 dev_queue_xmit(xmit_skb
);
2104 static ieee80211_rx_result debug_noinline
2105 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2107 struct net_device
*dev
= rx
->sdata
->dev
;
2108 struct sk_buff
*skb
= rx
->skb
;
2109 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2110 __le16 fc
= hdr
->frame_control
;
2111 struct sk_buff_head frame_list
;
2112 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2114 if (unlikely(!ieee80211_is_data(fc
)))
2117 if (unlikely(!ieee80211_is_data_present(fc
)))
2118 return RX_DROP_MONITOR
;
2120 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2123 if (ieee80211_has_a4(hdr
->frame_control
) &&
2124 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2125 !rx
->sdata
->u
.vlan
.sta
)
2126 return RX_DROP_UNUSABLE
;
2128 if (is_multicast_ether_addr(hdr
->addr1
) &&
2129 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2130 rx
->sdata
->u
.vlan
.sta
) ||
2131 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2132 rx
->sdata
->u
.mgd
.use_4addr
)))
2133 return RX_DROP_UNUSABLE
;
2136 __skb_queue_head_init(&frame_list
);
2138 if (skb_linearize(skb
))
2139 return RX_DROP_UNUSABLE
;
2141 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2142 rx
->sdata
->vif
.type
,
2143 rx
->local
->hw
.extra_tx_headroom
, true);
2145 while (!skb_queue_empty(&frame_list
)) {
2146 rx
->skb
= __skb_dequeue(&frame_list
);
2148 if (!ieee80211_frame_allowed(rx
, fc
)) {
2149 dev_kfree_skb(rx
->skb
);
2152 dev
->stats
.rx_packets
++;
2153 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2155 ieee80211_deliver_skb(rx
);
2161 #ifdef CONFIG_MAC80211_MESH
2162 static ieee80211_rx_result
2163 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2165 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2166 struct ieee80211_tx_info
*info
;
2167 struct ieee80211s_hdr
*mesh_hdr
;
2168 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2169 struct ieee80211_local
*local
= rx
->local
;
2170 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2171 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2172 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2175 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2176 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2178 /* make sure fixed part of mesh header is there, also checks skb len */
2179 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2180 return RX_DROP_MONITOR
;
2182 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2184 /* make sure full mesh header is there, also checks skb len */
2185 if (!pskb_may_pull(rx
->skb
,
2186 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2187 return RX_DROP_MONITOR
;
2189 /* reload pointers */
2190 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2191 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2193 /* frame is in RMC, don't forward */
2194 if (ieee80211_is_data(hdr
->frame_control
) &&
2195 is_multicast_ether_addr(hdr
->addr1
) &&
2196 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2197 return RX_DROP_MONITOR
;
2199 if (!ieee80211_is_data(hdr
->frame_control
) ||
2200 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2204 return RX_DROP_MONITOR
;
2206 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2207 struct mesh_path
*mppath
;
2211 if (is_multicast_ether_addr(hdr
->addr1
)) {
2212 mpp_addr
= hdr
->addr3
;
2213 proxied_addr
= mesh_hdr
->eaddr1
;
2214 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2215 /* has_a4 already checked in ieee80211_rx_mesh_check */
2216 mpp_addr
= hdr
->addr4
;
2217 proxied_addr
= mesh_hdr
->eaddr2
;
2219 return RX_DROP_MONITOR
;
2223 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2225 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2227 spin_lock_bh(&mppath
->state_lock
);
2228 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2229 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2230 spin_unlock_bh(&mppath
->state_lock
);
2235 /* Frame has reached destination. Don't forward */
2236 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2237 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2240 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2241 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2242 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2243 return RX_DROP_MONITOR
;
2245 skb_set_queue_mapping(skb
, q
);
2247 if (!--mesh_hdr
->ttl
) {
2248 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2252 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2255 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2257 net_info_ratelimited("%s: failed to clone mesh frame\n",
2262 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2263 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2264 info
= IEEE80211_SKB_CB(fwd_skb
);
2265 memset(info
, 0, sizeof(*info
));
2266 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2267 info
->control
.vif
= &rx
->sdata
->vif
;
2268 info
->control
.jiffies
= jiffies
;
2269 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2270 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2271 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2272 /* update power mode indication when forwarding */
2273 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2274 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2275 /* mesh power mode flags updated in mesh_nexthop_lookup */
2276 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2278 /* unable to resolve next hop */
2279 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2281 WLAN_REASON_MESH_PATH_NOFORWARD
,
2283 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2285 return RX_DROP_MONITOR
;
2288 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2289 ieee80211_add_pending_skb(local
, fwd_skb
);
2291 if (is_multicast_ether_addr(hdr
->addr1
) ||
2292 sdata
->dev
->flags
& IFF_PROMISC
)
2295 return RX_DROP_MONITOR
;
2299 static ieee80211_rx_result debug_noinline
2300 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2302 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2303 struct ieee80211_local
*local
= rx
->local
;
2304 struct net_device
*dev
= sdata
->dev
;
2305 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2306 __le16 fc
= hdr
->frame_control
;
2310 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2313 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2314 return RX_DROP_MONITOR
;
2317 * Send unexpected-4addr-frame event to hostapd. For older versions,
2318 * also drop the frame to cooked monitor interfaces.
2320 if (ieee80211_has_a4(hdr
->frame_control
) &&
2321 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2323 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2324 cfg80211_rx_unexpected_4addr_frame(
2325 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2326 return RX_DROP_MONITOR
;
2329 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2331 return RX_DROP_UNUSABLE
;
2333 if (!ieee80211_frame_allowed(rx
, fc
))
2334 return RX_DROP_MONITOR
;
2336 /* directly handle TDLS channel switch requests/responses */
2337 if (unlikely(((struct ethhdr
*)rx
->skb
->data
)->h_proto
==
2338 cpu_to_be16(ETH_P_TDLS
))) {
2339 struct ieee80211_tdls_data
*tf
= (void *)rx
->skb
->data
;
2341 if (pskb_may_pull(rx
->skb
,
2342 offsetof(struct ieee80211_tdls_data
, u
)) &&
2343 tf
->payload_type
== WLAN_TDLS_SNAP_RFTYPE
&&
2344 tf
->category
== WLAN_CATEGORY_TDLS
&&
2345 (tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_REQUEST
||
2346 tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_RESPONSE
)) {
2347 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TDLS_CHSW
;
2348 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2349 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2351 rx
->sta
->rx_packets
++;
2357 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2358 unlikely(port_control
) && sdata
->bss
) {
2359 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2367 dev
->stats
.rx_packets
++;
2368 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2370 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2371 !is_multicast_ether_addr(
2372 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2373 (!local
->scanning
&&
2374 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2375 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2376 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2379 ieee80211_deliver_skb(rx
);
2384 static ieee80211_rx_result debug_noinline
2385 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2387 struct sk_buff
*skb
= rx
->skb
;
2388 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2389 struct tid_ampdu_rx
*tid_agg_rx
;
2393 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2396 if (ieee80211_is_back_req(bar
->frame_control
)) {
2398 __le16 control
, start_seq_num
;
2399 } __packed bar_data
;
2402 return RX_DROP_MONITOR
;
2404 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2405 &bar_data
, sizeof(bar_data
)))
2406 return RX_DROP_MONITOR
;
2408 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2410 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2412 return RX_DROP_MONITOR
;
2414 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2416 /* reset session timer */
2417 if (tid_agg_rx
->timeout
)
2418 mod_timer(&tid_agg_rx
->session_timer
,
2419 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2421 spin_lock(&tid_agg_rx
->reorder_lock
);
2422 /* release stored frames up to start of BAR */
2423 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2424 start_seq_num
, frames
);
2425 spin_unlock(&tid_agg_rx
->reorder_lock
);
2432 * After this point, we only want management frames,
2433 * so we can drop all remaining control frames to
2434 * cooked monitor interfaces.
2436 return RX_DROP_MONITOR
;
2439 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2440 struct ieee80211_mgmt
*mgmt
,
2443 struct ieee80211_local
*local
= sdata
->local
;
2444 struct sk_buff
*skb
;
2445 struct ieee80211_mgmt
*resp
;
2447 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2448 /* Not to own unicast address */
2452 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2453 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2454 /* Not from the current AP or not associated yet. */
2458 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2459 /* Too short SA Query request frame */
2463 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2467 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2468 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2469 memset(resp
, 0, 24);
2470 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2471 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2472 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2473 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2474 IEEE80211_STYPE_ACTION
);
2475 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2476 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2477 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2478 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2479 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2480 WLAN_SA_QUERY_TR_ID_LEN
);
2482 ieee80211_tx_skb(sdata
, skb
);
2485 static ieee80211_rx_result debug_noinline
2486 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2488 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2489 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2492 * From here on, look only at management frames.
2493 * Data and control frames are already handled,
2494 * and unknown (reserved) frames are useless.
2496 if (rx
->skb
->len
< 24)
2497 return RX_DROP_MONITOR
;
2499 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2500 return RX_DROP_MONITOR
;
2502 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2503 ieee80211_is_beacon(mgmt
->frame_control
) &&
2504 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2507 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2508 sig
= status
->signal
;
2510 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2511 rx
->skb
->data
, rx
->skb
->len
,
2513 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2516 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2517 return RX_DROP_MONITOR
;
2519 if (ieee80211_drop_unencrypted_mgmt(rx
))
2520 return RX_DROP_UNUSABLE
;
2525 static ieee80211_rx_result debug_noinline
2526 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2528 struct ieee80211_local
*local
= rx
->local
;
2529 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2530 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2531 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2532 int len
= rx
->skb
->len
;
2534 if (!ieee80211_is_action(mgmt
->frame_control
))
2537 /* drop too small frames */
2538 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2539 return RX_DROP_UNUSABLE
;
2541 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2542 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2543 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2544 return RX_DROP_UNUSABLE
;
2546 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2547 return RX_DROP_UNUSABLE
;
2549 switch (mgmt
->u
.action
.category
) {
2550 case WLAN_CATEGORY_HT
:
2551 /* reject HT action frames from stations not supporting HT */
2552 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2555 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2556 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2557 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2558 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2559 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2562 /* verify action & smps_control/chanwidth are present */
2563 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2566 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2567 case WLAN_HT_ACTION_SMPS
: {
2568 struct ieee80211_supported_band
*sband
;
2569 enum ieee80211_smps_mode smps_mode
;
2571 /* convert to HT capability */
2572 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2573 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2574 smps_mode
= IEEE80211_SMPS_OFF
;
2576 case WLAN_HT_SMPS_CONTROL_STATIC
:
2577 smps_mode
= IEEE80211_SMPS_STATIC
;
2579 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2580 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2586 /* if no change do nothing */
2587 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2589 rx
->sta
->sta
.smps_mode
= smps_mode
;
2591 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2593 rate_control_rate_update(local
, sband
, rx
->sta
,
2594 IEEE80211_RC_SMPS_CHANGED
);
2597 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2598 struct ieee80211_supported_band
*sband
;
2599 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2600 enum ieee80211_sta_rx_bandwidth new_bw
;
2602 /* If it doesn't support 40 MHz it can't change ... */
2603 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2604 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2607 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2608 new_bw
= IEEE80211_STA_RX_BW_20
;
2610 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2612 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2615 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2617 rate_control_rate_update(local
, sband
, rx
->sta
,
2618 IEEE80211_RC_BW_CHANGED
);
2626 case WLAN_CATEGORY_PUBLIC
:
2627 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2629 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2633 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2635 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2636 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2638 if (len
< offsetof(struct ieee80211_mgmt
,
2639 u
.action
.u
.ext_chan_switch
.variable
))
2642 case WLAN_CATEGORY_VHT
:
2643 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2644 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2645 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2646 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2647 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2650 /* verify action code is present */
2651 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2654 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2655 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2658 /* verify opmode is present */
2659 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2662 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2664 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2665 opmode
, status
->band
,
2673 case WLAN_CATEGORY_BACK
:
2674 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2675 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2676 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2677 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2678 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2681 /* verify action_code is present */
2682 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2685 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2686 case WLAN_ACTION_ADDBA_REQ
:
2687 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2688 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2691 case WLAN_ACTION_ADDBA_RESP
:
2692 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2693 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2696 case WLAN_ACTION_DELBA
:
2697 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2698 sizeof(mgmt
->u
.action
.u
.delba
)))
2706 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2707 /* verify action_code is present */
2708 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2711 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2712 case WLAN_ACTION_SPCT_MSR_REQ
:
2713 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2716 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2717 sizeof(mgmt
->u
.action
.u
.measurement
)))
2720 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2723 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2725 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2727 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2728 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2731 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2732 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2733 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2736 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2737 bssid
= sdata
->u
.mgd
.bssid
;
2738 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2739 bssid
= sdata
->u
.ibss
.bssid
;
2740 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2745 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2752 case WLAN_CATEGORY_SA_QUERY
:
2753 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2754 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2757 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2758 case WLAN_ACTION_SA_QUERY_REQUEST
:
2759 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2761 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2765 case WLAN_CATEGORY_SELF_PROTECTED
:
2766 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2767 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2770 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2771 case WLAN_SP_MESH_PEERING_OPEN
:
2772 case WLAN_SP_MESH_PEERING_CLOSE
:
2773 case WLAN_SP_MESH_PEERING_CONFIRM
:
2774 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2776 if (sdata
->u
.mesh
.user_mpm
)
2777 /* userspace handles this frame */
2780 case WLAN_SP_MGK_INFORM
:
2781 case WLAN_SP_MGK_ACK
:
2782 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2787 case WLAN_CATEGORY_MESH_ACTION
:
2788 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2789 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2792 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2794 if (mesh_action_is_path_sel(mgmt
) &&
2795 !mesh_path_sel_is_hwmp(sdata
))
2803 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2804 /* will return in the next handlers */
2809 rx
->sta
->rx_packets
++;
2810 dev_kfree_skb(rx
->skb
);
2814 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2815 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2816 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2818 rx
->sta
->rx_packets
++;
2822 static ieee80211_rx_result debug_noinline
2823 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2825 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2828 /* skip known-bad action frames and return them in the next handler */
2829 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2833 * Getting here means the kernel doesn't know how to handle
2834 * it, but maybe userspace does ... include returned frames
2835 * so userspace can register for those to know whether ones
2836 * it transmitted were processed or returned.
2839 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2840 sig
= status
->signal
;
2842 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2843 rx
->skb
->data
, rx
->skb
->len
, 0)) {
2845 rx
->sta
->rx_packets
++;
2846 dev_kfree_skb(rx
->skb
);
2853 static ieee80211_rx_result debug_noinline
2854 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2856 struct ieee80211_local
*local
= rx
->local
;
2857 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2858 struct sk_buff
*nskb
;
2859 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2860 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2862 if (!ieee80211_is_action(mgmt
->frame_control
))
2866 * For AP mode, hostapd is responsible for handling any action
2867 * frames that we didn't handle, including returning unknown
2868 * ones. For all other modes we will return them to the sender,
2869 * setting the 0x80 bit in the action category, as required by
2870 * 802.11-2012 9.24.4.
2871 * Newer versions of hostapd shall also use the management frame
2872 * registration mechanisms, but older ones still use cooked
2873 * monitor interfaces so push all frames there.
2875 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2876 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2877 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2878 return RX_DROP_MONITOR
;
2880 if (is_multicast_ether_addr(mgmt
->da
))
2881 return RX_DROP_MONITOR
;
2883 /* do not return rejected action frames */
2884 if (mgmt
->u
.action
.category
& 0x80)
2885 return RX_DROP_UNUSABLE
;
2887 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2890 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2892 nmgmt
->u
.action
.category
|= 0x80;
2893 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2894 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2896 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2898 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2899 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2901 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2902 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2903 IEEE80211_TX_CTL_NO_CCK_RATE
;
2904 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2906 local
->hw
.offchannel_tx_hw_queue
;
2909 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2912 dev_kfree_skb(rx
->skb
);
2916 static ieee80211_rx_result debug_noinline
2917 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2919 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2920 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2923 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2925 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2926 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2927 sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
2928 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2929 return RX_DROP_MONITOR
;
2932 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2933 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2934 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2935 /* process for all: mesh, mlme, ibss */
2937 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2938 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2939 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2940 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2941 if (is_multicast_ether_addr(mgmt
->da
) &&
2942 !is_broadcast_ether_addr(mgmt
->da
))
2943 return RX_DROP_MONITOR
;
2945 /* process only for station */
2946 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2947 return RX_DROP_MONITOR
;
2949 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2950 /* process only for ibss and mesh */
2951 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2952 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2953 return RX_DROP_MONITOR
;
2956 return RX_DROP_MONITOR
;
2959 /* queue up frame and kick off work to process it */
2960 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2961 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2962 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2964 rx
->sta
->rx_packets
++;
2969 /* TODO: use IEEE80211_RX_FRAGMENTED */
2970 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2971 struct ieee80211_rate
*rate
)
2973 struct ieee80211_sub_if_data
*sdata
;
2974 struct ieee80211_local
*local
= rx
->local
;
2975 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2976 struct net_device
*prev_dev
= NULL
;
2977 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2978 int needed_headroom
;
2981 * If cooked monitor has been processed already, then
2982 * don't do it again. If not, set the flag.
2984 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2986 rx
->flags
|= IEEE80211_RX_CMNTR
;
2988 /* If there are no cooked monitor interfaces, just free the SKB */
2989 if (!local
->cooked_mntrs
)
2992 /* vendor data is long removed here */
2993 status
->flag
&= ~RX_FLAG_RADIOTAP_VENDOR_DATA
;
2994 /* room for the radiotap header based on driver features */
2995 needed_headroom
= ieee80211_rx_radiotap_hdrlen(local
, status
, skb
);
2997 if (skb_headroom(skb
) < needed_headroom
&&
2998 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
3001 /* prepend radiotap information */
3002 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
3005 skb_set_mac_header(skb
, 0);
3006 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3007 skb
->pkt_type
= PACKET_OTHERHOST
;
3008 skb
->protocol
= htons(ETH_P_802_2
);
3010 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3011 if (!ieee80211_sdata_running(sdata
))
3014 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
3015 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
3019 skb2
= skb_clone(skb
, GFP_ATOMIC
);
3021 skb2
->dev
= prev_dev
;
3022 netif_receive_skb(skb2
);
3026 prev_dev
= sdata
->dev
;
3027 sdata
->dev
->stats
.rx_packets
++;
3028 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
3032 skb
->dev
= prev_dev
;
3033 netif_receive_skb(skb
);
3041 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
3042 ieee80211_rx_result res
)
3045 case RX_DROP_MONITOR
:
3046 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3048 rx
->sta
->rx_dropped
++;
3051 struct ieee80211_rate
*rate
= NULL
;
3052 struct ieee80211_supported_band
*sband
;
3053 struct ieee80211_rx_status
*status
;
3055 status
= IEEE80211_SKB_RXCB((rx
->skb
));
3057 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
3058 if (!(status
->flag
& RX_FLAG_HT
) &&
3059 !(status
->flag
& RX_FLAG_VHT
))
3060 rate
= &sband
->bitrates
[status
->rate_idx
];
3062 ieee80211_rx_cooked_monitor(rx
, rate
);
3065 case RX_DROP_UNUSABLE
:
3066 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3068 rx
->sta
->rx_dropped
++;
3069 dev_kfree_skb(rx
->skb
);
3072 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
3077 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
3078 struct sk_buff_head
*frames
)
3080 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3081 struct sk_buff
*skb
;
3083 #define CALL_RXH(rxh) \
3086 if (res != RX_CONTINUE) \
3090 spin_lock_bh(&rx
->local
->rx_path_lock
);
3092 while ((skb
= __skb_dequeue(frames
))) {
3094 * all the other fields are valid across frames
3095 * that belong to an aMPDU since they are on the
3096 * same TID from the same station
3100 CALL_RXH(ieee80211_rx_h_check_more_data
)
3101 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
3102 CALL_RXH(ieee80211_rx_h_sta_process
)
3103 CALL_RXH(ieee80211_rx_h_decrypt
)
3104 CALL_RXH(ieee80211_rx_h_defragment
)
3105 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
3106 /* must be after MMIC verify so header is counted in MPDU mic */
3107 #ifdef CONFIG_MAC80211_MESH
3108 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3109 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3111 CALL_RXH(ieee80211_rx_h_amsdu
)
3112 CALL_RXH(ieee80211_rx_h_data
)
3114 /* special treatment -- needs the queue */
3115 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3116 if (res
!= RX_CONTINUE
)
3119 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3120 CALL_RXH(ieee80211_rx_h_action
)
3121 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3122 CALL_RXH(ieee80211_rx_h_action_return
)
3123 CALL_RXH(ieee80211_rx_h_mgmt
)
3126 ieee80211_rx_handlers_result(rx
, res
);
3131 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3134 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3136 struct sk_buff_head reorder_release
;
3137 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3139 __skb_queue_head_init(&reorder_release
);
3141 #define CALL_RXH(rxh) \
3144 if (res != RX_CONTINUE) \
3148 CALL_RXH(ieee80211_rx_h_check_dup
)
3149 CALL_RXH(ieee80211_rx_h_check
)
3151 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3153 ieee80211_rx_handlers(rx
, &reorder_release
);
3157 ieee80211_rx_handlers_result(rx
, res
);
3163 * This function makes calls into the RX path, therefore
3164 * it has to be invoked under RCU read lock.
3166 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3168 struct sk_buff_head frames
;
3169 struct ieee80211_rx_data rx
= {
3171 .sdata
= sta
->sdata
,
3172 .local
= sta
->local
,
3173 /* This is OK -- must be QoS data frame */
3174 .security_idx
= tid
,
3178 struct tid_ampdu_rx
*tid_agg_rx
;
3180 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3184 __skb_queue_head_init(&frames
);
3186 spin_lock(&tid_agg_rx
->reorder_lock
);
3187 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3188 spin_unlock(&tid_agg_rx
->reorder_lock
);
3190 ieee80211_rx_handlers(&rx
, &frames
);
3193 /* main receive path */
3195 static bool prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3196 struct ieee80211_hdr
*hdr
)
3198 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3199 struct sk_buff
*skb
= rx
->skb
;
3200 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3201 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3202 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3204 switch (sdata
->vif
.type
) {
3205 case NL80211_IFTYPE_STATION
:
3206 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3209 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3210 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3211 sdata
->u
.mgd
.use_4addr
)
3213 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3216 case NL80211_IFTYPE_ADHOC
:
3219 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3220 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3222 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3224 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3226 } else if (!multicast
&&
3227 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3228 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3230 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3231 } else if (!rx
->sta
) {
3233 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3234 rate_idx
= 0; /* TODO: HT/VHT rates */
3236 rate_idx
= status
->rate_idx
;
3237 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3241 case NL80211_IFTYPE_OCB
:
3244 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3246 } else if (!is_broadcast_ether_addr(bssid
)) {
3247 ocb_dbg(sdata
, "BSSID mismatch in OCB mode!\n");
3249 } else if (!multicast
&&
3250 !ether_addr_equal(sdata
->dev
->dev_addr
,
3252 /* if we are in promisc mode we also accept
3253 * packets not destined for us
3255 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3257 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
3258 } else if (!rx
->sta
) {
3260 if (status
->flag
& RX_FLAG_HT
)
3261 rate_idx
= 0; /* TODO: HT rates */
3263 rate_idx
= status
->rate_idx
;
3264 ieee80211_ocb_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3268 case NL80211_IFTYPE_MESH_POINT
:
3270 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3271 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3274 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3277 case NL80211_IFTYPE_AP_VLAN
:
3278 case NL80211_IFTYPE_AP
:
3280 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3282 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3284 * Accept public action frames even when the
3285 * BSSID doesn't match, this is used for P2P
3286 * and location updates. Note that mac80211
3287 * itself never looks at these frames.
3290 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3292 if (ieee80211_is_public_action(hdr
, skb
->len
))
3294 if (!ieee80211_is_beacon(hdr
->frame_control
))
3296 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3297 } else if (!ieee80211_has_tods(hdr
->frame_control
)) {
3298 /* ignore data frames to TDLS-peers */
3299 if (ieee80211_is_data(hdr
->frame_control
))
3301 /* ignore action frames to TDLS-peers */
3302 if (ieee80211_is_action(hdr
->frame_control
) &&
3303 !ether_addr_equal(bssid
, hdr
->addr1
))
3307 case NL80211_IFTYPE_WDS
:
3308 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3310 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3313 case NL80211_IFTYPE_P2P_DEVICE
:
3314 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3315 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3316 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3317 !ieee80211_is_beacon(hdr
->frame_control
))
3319 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3321 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3324 /* should never get here */
3333 * This function returns whether or not the SKB
3334 * was destined for RX processing or not, which,
3335 * if consume is true, is equivalent to whether
3336 * or not the skb was consumed.
3338 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3339 struct sk_buff
*skb
, bool consume
)
3341 struct ieee80211_local
*local
= rx
->local
;
3342 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3343 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3344 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3347 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3349 if (!prepare_for_handlers(rx
, hdr
))
3353 skb
= skb_copy(skb
, GFP_ATOMIC
);
3355 if (net_ratelimit())
3356 wiphy_debug(local
->hw
.wiphy
,
3357 "failed to copy skb for %s\n",
3365 ieee80211_invoke_rx_handlers(rx
);
3370 * This is the actual Rx frames handler. as it belongs to Rx path it must
3371 * be called with rcu_read_lock protection.
3373 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3374 struct sk_buff
*skb
)
3376 struct ieee80211_local
*local
= hw_to_local(hw
);
3377 struct ieee80211_sub_if_data
*sdata
;
3378 struct ieee80211_hdr
*hdr
;
3380 struct ieee80211_rx_data rx
;
3381 struct ieee80211_sub_if_data
*prev
;
3382 struct sta_info
*sta
, *tmp
, *prev_sta
;
3385 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3386 memset(&rx
, 0, sizeof(rx
));
3390 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3391 local
->dot11ReceivedFragmentCount
++;
3393 if (ieee80211_is_mgmt(fc
)) {
3394 /* drop frame if too short for header */
3395 if (skb
->len
< ieee80211_hdrlen(fc
))
3398 err
= skb_linearize(skb
);
3400 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3408 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3409 ieee80211_parse_qos(&rx
);
3410 ieee80211_verify_alignment(&rx
);
3412 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3413 ieee80211_is_beacon(hdr
->frame_control
)))
3414 ieee80211_scan_rx(local
, skb
);
3416 if (ieee80211_is_data(fc
)) {
3419 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3426 rx
.sdata
= prev_sta
->sdata
;
3427 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3434 rx
.sdata
= prev_sta
->sdata
;
3436 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3444 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3445 if (!ieee80211_sdata_running(sdata
))
3448 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3449 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3453 * frame is destined for this interface, but if it's
3454 * not also for the previous one we handle that after
3455 * the loop to avoid copying the SKB once too much
3463 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3465 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3471 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3474 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3483 * This is the receive path handler. It is called by a low level driver when an
3484 * 802.11 MPDU is received from the hardware.
3486 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3488 struct ieee80211_local
*local
= hw_to_local(hw
);
3489 struct ieee80211_rate
*rate
= NULL
;
3490 struct ieee80211_supported_band
*sband
;
3491 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3493 WARN_ON_ONCE(softirq_count() == 0);
3495 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3498 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3499 if (WARN_ON(!sband
))
3503 * If we're suspending, it is possible although not too likely
3504 * that we'd be receiving frames after having already partially
3505 * quiesced the stack. We can't process such frames then since
3506 * that might, for example, cause stations to be added or other
3507 * driver callbacks be invoked.
3509 if (unlikely(local
->quiescing
|| local
->suspended
))
3512 /* We might be during a HW reconfig, prevent Rx for the same reason */
3513 if (unlikely(local
->in_reconfig
))
3517 * The same happens when we're not even started,
3518 * but that's worth a warning.
3520 if (WARN_ON(!local
->started
))
3523 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3525 * Validate the rate, unless a PLCP error means that
3526 * we probably can't have a valid rate here anyway.
3529 if (status
->flag
& RX_FLAG_HT
) {
3531 * rate_idx is MCS index, which can be [0-76]
3534 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3536 * Anything else would be some sort of driver or
3537 * hardware error. The driver should catch hardware
3540 if (WARN(status
->rate_idx
> 76,
3541 "Rate marked as an HT rate but passed "
3542 "status->rate_idx is not "
3543 "an MCS index [0-76]: %d (0x%02x)\n",
3547 } else if (status
->flag
& RX_FLAG_VHT
) {
3548 if (WARN_ONCE(status
->rate_idx
> 9 ||
3550 status
->vht_nss
> 8,
3551 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3552 status
->rate_idx
, status
->vht_nss
))
3555 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3557 rate
= &sband
->bitrates
[status
->rate_idx
];
3561 status
->rx_flags
= 0;
3564 * key references and virtual interfaces are protected using RCU
3565 * and this requires that we are in a read-side RCU section during
3566 * receive processing
3571 * Frames with failed FCS/PLCP checksum are not returned,
3572 * all other frames are returned without radiotap header
3573 * if it was previously present.
3574 * Also, frames with less than 16 bytes are dropped.
3576 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3582 ieee80211_tpt_led_trig_rx(local
,
3583 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3585 __ieee80211_rx_handle_packet(hw
, skb
);
3593 EXPORT_SYMBOL(ieee80211_rx
);
3595 /* This is a version of the rx handler that can be called from hard irq
3596 * context. Post the skb on the queue and schedule the tasklet */
3597 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3599 struct ieee80211_local
*local
= hw_to_local(hw
);
3601 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3603 skb
->pkt_type
= IEEE80211_RX_MSG
;
3604 skb_queue_tail(&local
->skb_queue
, skb
);
3605 tasklet_schedule(&local
->tasklet
);
3607 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);