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(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")
1059 if (rx
->skb
->len
>= 24 && rx
->sta
&&
1060 !ieee80211_is_ctl(hdr
->frame_control
) &&
1061 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1062 !is_multicast_ether_addr(hdr
->addr1
)) {
1063 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1064 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
1066 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1067 rx
->local
->dot11FrameDuplicateCount
++;
1068 rx
->sta
->num_duplicates
++;
1070 return RX_DROP_UNUSABLE
;
1071 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1072 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1076 if (unlikely(rx
->skb
->len
< 16)) {
1077 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
1078 return RX_DROP_MONITOR
;
1081 /* Drop disallowed frame classes based on STA auth/assoc state;
1082 * IEEE 802.11, Chap 5.5.
1084 * mac80211 filters only based on association state, i.e. it drops
1085 * Class 3 frames from not associated stations. hostapd sends
1086 * deauth/disassoc frames when needed. In addition, hostapd is
1087 * responsible for filtering on both auth and assoc states.
1090 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1091 return ieee80211_rx_mesh_check(rx
);
1093 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1094 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1095 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1096 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1097 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
1098 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1100 * accept port control frames from the AP even when it's not
1101 * yet marked ASSOC to prevent a race where we don't set the
1102 * assoc bit quickly enough before it sends the first frame
1104 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1105 ieee80211_is_data_present(hdr
->frame_control
)) {
1106 unsigned int hdrlen
;
1109 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1111 if (rx
->skb
->len
< hdrlen
+ 8)
1112 return RX_DROP_MONITOR
;
1114 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1115 if (ethertype
== rx
->sdata
->control_port_protocol
)
1119 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1120 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1123 return RX_DROP_UNUSABLE
;
1125 return RX_DROP_MONITOR
;
1132 static ieee80211_rx_result debug_noinline
1133 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1135 struct ieee80211_local
*local
;
1136 struct ieee80211_hdr
*hdr
;
1137 struct sk_buff
*skb
;
1141 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1143 if (!local
->pspolling
)
1146 if (!ieee80211_has_fromds(hdr
->frame_control
))
1147 /* this is not from AP */
1150 if (!ieee80211_is_data(hdr
->frame_control
))
1153 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1154 /* AP has no more frames buffered for us */
1155 local
->pspolling
= false;
1159 /* more data bit is set, let's request a new frame from the AP */
1160 ieee80211_send_pspoll(local
, rx
->sdata
);
1165 static void sta_ps_start(struct sta_info
*sta
)
1167 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1168 struct ieee80211_local
*local
= sdata
->local
;
1171 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1172 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1173 ps
= &sdata
->bss
->ps
;
1177 atomic_inc(&ps
->num_sta_ps
);
1178 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1179 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1180 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1181 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1182 sta
->sta
.addr
, sta
->sta
.aid
);
1185 static void sta_ps_end(struct sta_info
*sta
)
1187 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1188 sta
->sta
.addr
, sta
->sta
.aid
);
1190 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1192 * Clear the flag only if the other one is still set
1193 * so that the TX path won't start TX'ing new frames
1194 * directly ... In the case that the driver flag isn't
1195 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1197 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1198 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1199 sta
->sta
.addr
, sta
->sta
.aid
);
1203 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1204 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1205 ieee80211_sta_ps_deliver_wakeup(sta
);
1208 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1210 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1213 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1215 /* Don't let the same PS state be set twice */
1216 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1217 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1221 sta_ps_start(sta_inf
);
1223 sta_ps_end(sta_inf
);
1227 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1229 static ieee80211_rx_result debug_noinline
1230 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1232 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1233 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1234 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1237 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1240 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1241 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1245 * The device handles station powersave, so don't do anything about
1246 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1247 * it to mac80211 since they're handled.)
1249 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1253 * Don't do anything if the station isn't already asleep. In
1254 * the uAPSD case, the station will probably be marked asleep,
1255 * in the PS-Poll case the station must be confused ...
1257 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1260 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1261 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1262 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1263 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1265 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1268 /* Free PS Poll skb here instead of returning RX_DROP that would
1269 * count as an dropped frame. */
1270 dev_kfree_skb(rx
->skb
);
1273 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1274 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1275 ieee80211_has_pm(hdr
->frame_control
) &&
1276 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1277 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1278 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1279 ac
= ieee802_1d_to_ac
[tid
& 7];
1282 * If this AC is not trigger-enabled do nothing.
1284 * NB: This could/should check a separate bitmap of trigger-
1285 * enabled queues, but for now we only implement uAPSD w/o
1286 * TSPEC changes to the ACs, so they're always the same.
1288 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1291 /* if we are in a service period, do nothing */
1292 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1295 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1296 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1298 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1304 static ieee80211_rx_result debug_noinline
1305 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1307 struct sta_info
*sta
= rx
->sta
;
1308 struct sk_buff
*skb
= rx
->skb
;
1309 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1310 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1317 * Update last_rx only for IBSS packets which are for the current
1318 * BSSID and for station already AUTHORIZED to avoid keeping the
1319 * current IBSS network alive in cases where other STAs start
1320 * using different BSSID. This will also give the station another
1321 * chance to restart the authentication/authorization in case
1322 * something went wrong the first time.
1324 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1325 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1326 NL80211_IFTYPE_ADHOC
);
1327 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1328 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1329 sta
->last_rx
= jiffies
;
1330 if (ieee80211_is_data(hdr
->frame_control
) &&
1331 !is_multicast_ether_addr(hdr
->addr1
)) {
1332 sta
->last_rx_rate_idx
= status
->rate_idx
;
1333 sta
->last_rx_rate_flag
= status
->flag
;
1334 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1335 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1338 } else if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
) {
1339 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1340 NL80211_IFTYPE_OCB
);
1341 /* OCB uses wild-card BSSID */
1342 if (is_broadcast_ether_addr(bssid
))
1343 sta
->last_rx
= jiffies
;
1344 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1346 * Mesh beacons will update last_rx when if they are found to
1347 * match the current local configuration when processed.
1349 sta
->last_rx
= jiffies
;
1350 if (ieee80211_is_data(hdr
->frame_control
)) {
1351 sta
->last_rx_rate_idx
= status
->rate_idx
;
1352 sta
->last_rx_rate_flag
= status
->flag
;
1353 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1354 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1358 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1361 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1362 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1364 sta
->rx_fragments
++;
1365 sta
->rx_bytes
+= rx
->skb
->len
;
1366 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1367 sta
->last_signal
= status
->signal
;
1368 ewma_add(&sta
->avg_signal
, -status
->signal
);
1371 if (status
->chains
) {
1372 sta
->chains
= status
->chains
;
1373 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1374 int signal
= status
->chain_signal
[i
];
1376 if (!(status
->chains
& BIT(i
)))
1379 sta
->chain_signal_last
[i
] = signal
;
1380 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1385 * Change STA power saving mode only at the end of a frame
1386 * exchange sequence.
1388 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1389 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1390 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1391 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1392 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1393 /* PM bit is only checked in frames where it isn't reserved,
1394 * in AP mode it's reserved in non-bufferable management frames
1395 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1397 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1398 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1399 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1400 if (!ieee80211_has_pm(hdr
->frame_control
))
1403 if (ieee80211_has_pm(hdr
->frame_control
))
1408 /* mesh power save support */
1409 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1410 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1413 * Drop (qos-)data::nullfunc frames silently, since they
1414 * are used only to control station power saving mode.
1416 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1417 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1418 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1421 * If we receive a 4-addr nullfunc frame from a STA
1422 * that was not moved to a 4-addr STA vlan yet send
1423 * the event to userspace and for older hostapd drop
1424 * the frame to the monitor interface.
1426 if (ieee80211_has_a4(hdr
->frame_control
) &&
1427 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1428 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1429 !rx
->sdata
->u
.vlan
.sta
))) {
1430 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1431 cfg80211_rx_unexpected_4addr_frame(
1432 rx
->sdata
->dev
, sta
->sta
.addr
,
1434 return RX_DROP_MONITOR
;
1437 * Update counter and free packet here to avoid
1438 * counting this as a dropped packed.
1441 dev_kfree_skb(rx
->skb
);
1446 } /* ieee80211_rx_h_sta_process */
1448 static ieee80211_rx_result debug_noinline
1449 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1451 struct sk_buff
*skb
= rx
->skb
;
1452 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1453 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1456 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1457 struct ieee80211_key
*sta_ptk
= NULL
;
1458 int mmie_keyidx
= -1;
1460 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1465 * There are four types of keys:
1466 * - GTK (group keys)
1467 * - IGTK (group keys for management frames)
1468 * - PTK (pairwise keys)
1469 * - STK (station-to-station pairwise keys)
1471 * When selecting a key, we have to distinguish between multicast
1472 * (including broadcast) and unicast frames, the latter can only
1473 * use PTKs and STKs while the former always use GTKs and IGTKs.
1474 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1475 * unicast frames can also use key indices like GTKs. Hence, if we
1476 * don't have a PTK/STK we check the key index for a WEP key.
1478 * Note that in a regular BSS, multicast frames are sent by the
1479 * AP only, associated stations unicast the frame to the AP first
1480 * which then multicasts it on their behalf.
1482 * There is also a slight problem in IBSS mode: GTKs are negotiated
1483 * with each station, that is something we don't currently handle.
1484 * The spec seems to expect that one negotiates the same key with
1485 * every station but there's no such requirement; VLANs could be
1490 * No point in finding a key and decrypting if the frame is neither
1491 * addressed to us nor a multicast frame.
1493 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1496 /* start without a key */
1498 fc
= hdr
->frame_control
;
1501 int keyid
= rx
->sta
->ptk_idx
;
1503 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1504 cs
= rx
->sta
->cipher_scheme
;
1505 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1506 if (unlikely(keyid
< 0))
1507 return RX_DROP_UNUSABLE
;
1509 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1512 if (!ieee80211_has_protected(fc
))
1513 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1515 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1517 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1518 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1520 /* Skip decryption if the frame is not protected. */
1521 if (!ieee80211_has_protected(fc
))
1523 } else if (mmie_keyidx
>= 0) {
1524 /* Broadcast/multicast robust management frame / BIP */
1525 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1526 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1529 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1530 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1531 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1533 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1535 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1536 } else if (!ieee80211_has_protected(fc
)) {
1538 * The frame was not protected, so skip decryption. However, we
1539 * need to set rx->key if there is a key that could have been
1540 * used so that the frame may be dropped if encryption would
1541 * have been expected.
1543 struct ieee80211_key
*key
= NULL
;
1544 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1547 if (ieee80211_is_mgmt(fc
) &&
1548 is_multicast_ether_addr(hdr
->addr1
) &&
1549 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1553 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1554 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1560 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1561 key
= rcu_dereference(sdata
->keys
[i
]);
1574 * The device doesn't give us the IV so we won't be
1575 * able to look up the key. That's ok though, we
1576 * don't need to decrypt the frame, we just won't
1577 * be able to keep statistics accurate.
1578 * Except for key threshold notifications, should
1579 * we somehow allow the driver to tell us which key
1580 * the hardware used if this flag is set?
1582 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1583 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1586 hdrlen
= ieee80211_hdrlen(fc
);
1589 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1591 if (unlikely(keyidx
< 0))
1592 return RX_DROP_UNUSABLE
;
1594 if (rx
->skb
->len
< 8 + hdrlen
)
1595 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1597 * no need to call ieee80211_wep_get_keyidx,
1598 * it verifies a bunch of things we've done already
1600 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1601 keyidx
= keyid
>> 6;
1604 /* check per-station GTK first, if multicast packet */
1605 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1606 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1608 /* if not found, try default key */
1610 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1613 * RSNA-protected unicast frames should always be
1614 * sent with pairwise or station-to-station keys,
1615 * but for WEP we allow using a key index as well.
1618 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1619 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1620 !is_multicast_ether_addr(hdr
->addr1
))
1626 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1627 return RX_DROP_MONITOR
;
1629 rx
->key
->tx_rx_count
++;
1630 /* TODO: add threshold stuff again */
1632 return RX_DROP_MONITOR
;
1635 switch (rx
->key
->conf
.cipher
) {
1636 case WLAN_CIPHER_SUITE_WEP40
:
1637 case WLAN_CIPHER_SUITE_WEP104
:
1638 result
= ieee80211_crypto_wep_decrypt(rx
);
1640 case WLAN_CIPHER_SUITE_TKIP
:
1641 result
= ieee80211_crypto_tkip_decrypt(rx
);
1643 case WLAN_CIPHER_SUITE_CCMP
:
1644 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1646 case WLAN_CIPHER_SUITE_AES_CMAC
:
1647 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1650 result
= ieee80211_crypto_hw_decrypt(rx
);
1653 /* the hdr variable is invalid after the decrypt handlers */
1655 /* either the frame has been decrypted or will be dropped */
1656 status
->flag
|= RX_FLAG_DECRYPTED
;
1661 static inline struct ieee80211_fragment_entry
*
1662 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1663 unsigned int frag
, unsigned int seq
, int rx_queue
,
1664 struct sk_buff
**skb
)
1666 struct ieee80211_fragment_entry
*entry
;
1668 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1669 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1670 sdata
->fragment_next
= 0;
1672 if (!skb_queue_empty(&entry
->skb_list
))
1673 __skb_queue_purge(&entry
->skb_list
);
1675 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1677 entry
->first_frag_time
= jiffies
;
1679 entry
->rx_queue
= rx_queue
;
1680 entry
->last_frag
= frag
;
1682 entry
->extra_len
= 0;
1687 static inline struct ieee80211_fragment_entry
*
1688 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1689 unsigned int frag
, unsigned int seq
,
1690 int rx_queue
, struct ieee80211_hdr
*hdr
)
1692 struct ieee80211_fragment_entry
*entry
;
1695 idx
= sdata
->fragment_next
;
1696 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1697 struct ieee80211_hdr
*f_hdr
;
1701 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1703 entry
= &sdata
->fragments
[idx
];
1704 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1705 entry
->rx_queue
!= rx_queue
||
1706 entry
->last_frag
+ 1 != frag
)
1709 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1712 * Check ftype and addresses are equal, else check next fragment
1714 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1715 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1716 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1717 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1720 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1721 __skb_queue_purge(&entry
->skb_list
);
1730 static ieee80211_rx_result debug_noinline
1731 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1733 struct ieee80211_hdr
*hdr
;
1736 unsigned int frag
, seq
;
1737 struct ieee80211_fragment_entry
*entry
;
1738 struct sk_buff
*skb
;
1739 struct ieee80211_rx_status
*status
;
1741 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1742 fc
= hdr
->frame_control
;
1744 if (ieee80211_is_ctl(fc
))
1747 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1748 frag
= sc
& IEEE80211_SCTL_FRAG
;
1750 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1751 is_multicast_ether_addr(hdr
->addr1
))) {
1752 /* not fragmented */
1755 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1757 if (skb_linearize(rx
->skb
))
1758 return RX_DROP_UNUSABLE
;
1761 * skb_linearize() might change the skb->data and
1762 * previously cached variables (in this case, hdr) need to
1763 * be refreshed with the new data.
1765 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1766 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1769 /* This is the first fragment of a new frame. */
1770 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1771 rx
->seqno_idx
, &(rx
->skb
));
1772 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1773 ieee80211_has_protected(fc
)) {
1774 int queue
= rx
->security_idx
;
1775 /* Store CCMP PN so that we can verify that the next
1776 * fragment has a sequential PN value. */
1778 memcpy(entry
->last_pn
,
1779 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1780 IEEE80211_CCMP_PN_LEN
);
1785 /* This is a fragment for a frame that should already be pending in
1786 * fragment cache. Add this fragment to the end of the pending entry.
1788 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1789 rx
->seqno_idx
, hdr
);
1791 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1792 return RX_DROP_MONITOR
;
1795 /* Verify that MPDUs within one MSDU have sequential PN values.
1796 * (IEEE 802.11i, 8.3.3.4.5) */
1799 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1801 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1802 return RX_DROP_UNUSABLE
;
1803 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1804 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1809 queue
= rx
->security_idx
;
1810 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1811 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1812 return RX_DROP_UNUSABLE
;
1813 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1816 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1817 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1818 entry
->last_frag
= frag
;
1819 entry
->extra_len
+= rx
->skb
->len
;
1820 if (ieee80211_has_morefrags(fc
)) {
1825 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1826 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1827 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1828 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1830 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1831 __skb_queue_purge(&entry
->skb_list
);
1832 return RX_DROP_UNUSABLE
;
1835 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1836 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1840 /* Complete frame has been reassembled - process it now */
1841 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1842 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1846 rx
->sta
->rx_packets
++;
1847 if (is_multicast_ether_addr(hdr
->addr1
))
1848 rx
->local
->dot11MulticastReceivedFrameCount
++;
1850 ieee80211_led_rx(rx
->local
);
1854 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1856 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1862 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1864 struct sk_buff
*skb
= rx
->skb
;
1865 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1868 * Pass through unencrypted frames if the hardware has
1869 * decrypted them already.
1871 if (status
->flag
& RX_FLAG_DECRYPTED
)
1874 /* Drop unencrypted frames if key is set. */
1875 if (unlikely(!ieee80211_has_protected(fc
) &&
1876 !ieee80211_is_nullfunc(fc
) &&
1877 ieee80211_is_data(fc
) &&
1878 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1884 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1886 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1887 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1888 __le16 fc
= hdr
->frame_control
;
1891 * Pass through unencrypted frames if the hardware has
1892 * decrypted them already.
1894 if (status
->flag
& RX_FLAG_DECRYPTED
)
1897 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1898 if (unlikely(!ieee80211_has_protected(fc
) &&
1899 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1901 if (ieee80211_is_deauth(fc
) ||
1902 ieee80211_is_disassoc(fc
))
1903 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1908 /* BIP does not use Protected field, so need to check MMIE */
1909 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1910 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1911 if (ieee80211_is_deauth(fc
) ||
1912 ieee80211_is_disassoc(fc
))
1913 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1919 * When using MFP, Action frames are not allowed prior to
1920 * having configured keys.
1922 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1923 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
1931 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1933 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1934 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1935 bool check_port_control
= false;
1936 struct ethhdr
*ehdr
;
1939 *port_control
= false;
1940 if (ieee80211_has_a4(hdr
->frame_control
) &&
1941 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1944 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1945 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1947 if (!sdata
->u
.mgd
.use_4addr
)
1950 check_port_control
= true;
1953 if (is_multicast_ether_addr(hdr
->addr1
) &&
1954 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1957 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1961 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1962 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1963 *port_control
= true;
1964 else if (check_port_control
)
1971 * requires that rx->skb is a frame with ethernet header
1973 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1975 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1976 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1977 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1980 * Allow EAPOL frames to us/the PAE group address regardless
1981 * of whether the frame was encrypted or not.
1983 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1984 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1985 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1988 if (ieee80211_802_1x_port_control(rx
) ||
1989 ieee80211_drop_unencrypted(rx
, fc
))
1996 * requires that rx->skb is a frame with ethernet header
1999 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
2001 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2002 struct net_device
*dev
= sdata
->dev
;
2003 struct sk_buff
*skb
, *xmit_skb
;
2004 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2005 struct sta_info
*dsta
;
2006 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2011 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2012 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
2013 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
2014 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
2015 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
2016 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
2018 * send multicast frames both to higher layers in
2019 * local net stack and back to the wireless medium
2021 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
2023 net_info_ratelimited("%s: failed to clone multicast frame\n",
2026 dsta
= sta_info_get(sdata
, skb
->data
);
2029 * The destination station is associated to
2030 * this AP (in this VLAN), so send the frame
2031 * directly to it and do not pass it to local
2040 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2042 /* 'align' will only take the values 0 or 2 here since all
2043 * frames are required to be aligned to 2-byte boundaries
2044 * when being passed to mac80211; the code here works just
2045 * as well if that isn't true, but mac80211 assumes it can
2046 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2050 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
2052 if (WARN_ON(skb_headroom(skb
) < 3)) {
2056 u8
*data
= skb
->data
;
2057 size_t len
= skb_headlen(skb
);
2059 memmove(skb
->data
, data
, len
);
2060 skb_set_tail_pointer(skb
, len
);
2067 /* deliver to local stack */
2068 skb
->protocol
= eth_type_trans(skb
, dev
);
2069 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2070 if (rx
->local
->napi
)
2071 napi_gro_receive(rx
->local
->napi
, skb
);
2073 netif_receive_skb(skb
);
2078 * Send to wireless media and increase priority by 256 to
2079 * keep the received priority instead of reclassifying
2080 * the frame (see cfg80211_classify8021d).
2082 xmit_skb
->priority
+= 256;
2083 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2084 skb_reset_network_header(xmit_skb
);
2085 skb_reset_mac_header(xmit_skb
);
2086 dev_queue_xmit(xmit_skb
);
2090 static ieee80211_rx_result debug_noinline
2091 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2093 struct net_device
*dev
= rx
->sdata
->dev
;
2094 struct sk_buff
*skb
= rx
->skb
;
2095 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2096 __le16 fc
= hdr
->frame_control
;
2097 struct sk_buff_head frame_list
;
2098 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2100 if (unlikely(!ieee80211_is_data(fc
)))
2103 if (unlikely(!ieee80211_is_data_present(fc
)))
2104 return RX_DROP_MONITOR
;
2106 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2109 if (ieee80211_has_a4(hdr
->frame_control
) &&
2110 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2111 !rx
->sdata
->u
.vlan
.sta
)
2112 return RX_DROP_UNUSABLE
;
2114 if (is_multicast_ether_addr(hdr
->addr1
) &&
2115 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2116 rx
->sdata
->u
.vlan
.sta
) ||
2117 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2118 rx
->sdata
->u
.mgd
.use_4addr
)))
2119 return RX_DROP_UNUSABLE
;
2122 __skb_queue_head_init(&frame_list
);
2124 if (skb_linearize(skb
))
2125 return RX_DROP_UNUSABLE
;
2127 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2128 rx
->sdata
->vif
.type
,
2129 rx
->local
->hw
.extra_tx_headroom
, true);
2131 while (!skb_queue_empty(&frame_list
)) {
2132 rx
->skb
= __skb_dequeue(&frame_list
);
2134 if (!ieee80211_frame_allowed(rx
, fc
)) {
2135 dev_kfree_skb(rx
->skb
);
2138 dev
->stats
.rx_packets
++;
2139 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2141 ieee80211_deliver_skb(rx
);
2147 #ifdef CONFIG_MAC80211_MESH
2148 static ieee80211_rx_result
2149 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2151 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2152 struct ieee80211_tx_info
*info
;
2153 struct ieee80211s_hdr
*mesh_hdr
;
2154 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2155 struct ieee80211_local
*local
= rx
->local
;
2156 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2157 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2158 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2161 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2162 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2164 /* make sure fixed part of mesh header is there, also checks skb len */
2165 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2166 return RX_DROP_MONITOR
;
2168 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2170 /* make sure full mesh header is there, also checks skb len */
2171 if (!pskb_may_pull(rx
->skb
,
2172 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2173 return RX_DROP_MONITOR
;
2175 /* reload pointers */
2176 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2177 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2179 /* frame is in RMC, don't forward */
2180 if (ieee80211_is_data(hdr
->frame_control
) &&
2181 is_multicast_ether_addr(hdr
->addr1
) &&
2182 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2183 return RX_DROP_MONITOR
;
2185 if (!ieee80211_is_data(hdr
->frame_control
) ||
2186 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2190 return RX_DROP_MONITOR
;
2192 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2193 struct mesh_path
*mppath
;
2197 if (is_multicast_ether_addr(hdr
->addr1
)) {
2198 mpp_addr
= hdr
->addr3
;
2199 proxied_addr
= mesh_hdr
->eaddr1
;
2200 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2201 /* has_a4 already checked in ieee80211_rx_mesh_check */
2202 mpp_addr
= hdr
->addr4
;
2203 proxied_addr
= mesh_hdr
->eaddr2
;
2205 return RX_DROP_MONITOR
;
2209 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2211 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2213 spin_lock_bh(&mppath
->state_lock
);
2214 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2215 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2216 spin_unlock_bh(&mppath
->state_lock
);
2221 /* Frame has reached destination. Don't forward */
2222 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2223 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2226 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2227 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2228 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2229 return RX_DROP_MONITOR
;
2231 skb_set_queue_mapping(skb
, q
);
2233 if (!--mesh_hdr
->ttl
) {
2234 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2238 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2241 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2243 net_info_ratelimited("%s: failed to clone mesh frame\n",
2248 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2249 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2250 info
= IEEE80211_SKB_CB(fwd_skb
);
2251 memset(info
, 0, sizeof(*info
));
2252 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2253 info
->control
.vif
= &rx
->sdata
->vif
;
2254 info
->control
.jiffies
= jiffies
;
2255 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2256 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2257 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2258 /* update power mode indication when forwarding */
2259 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2260 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2261 /* mesh power mode flags updated in mesh_nexthop_lookup */
2262 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2264 /* unable to resolve next hop */
2265 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2267 WLAN_REASON_MESH_PATH_NOFORWARD
,
2269 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2271 return RX_DROP_MONITOR
;
2274 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2275 ieee80211_add_pending_skb(local
, fwd_skb
);
2277 if (is_multicast_ether_addr(hdr
->addr1
) ||
2278 sdata
->dev
->flags
& IFF_PROMISC
)
2281 return RX_DROP_MONITOR
;
2285 static ieee80211_rx_result debug_noinline
2286 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2288 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2289 struct ieee80211_local
*local
= rx
->local
;
2290 struct net_device
*dev
= sdata
->dev
;
2291 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2292 __le16 fc
= hdr
->frame_control
;
2296 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2299 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2300 return RX_DROP_MONITOR
;
2303 * Send unexpected-4addr-frame event to hostapd. For older versions,
2304 * also drop the frame to cooked monitor interfaces.
2306 if (ieee80211_has_a4(hdr
->frame_control
) &&
2307 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2309 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2310 cfg80211_rx_unexpected_4addr_frame(
2311 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2312 return RX_DROP_MONITOR
;
2315 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2317 return RX_DROP_UNUSABLE
;
2319 if (!ieee80211_frame_allowed(rx
, fc
))
2320 return RX_DROP_MONITOR
;
2322 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2323 unlikely(port_control
) && sdata
->bss
) {
2324 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2332 dev
->stats
.rx_packets
++;
2333 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2335 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2336 !is_multicast_ether_addr(
2337 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2338 (!local
->scanning
&&
2339 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2340 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2341 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2344 ieee80211_deliver_skb(rx
);
2349 static ieee80211_rx_result debug_noinline
2350 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2352 struct sk_buff
*skb
= rx
->skb
;
2353 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2354 struct tid_ampdu_rx
*tid_agg_rx
;
2358 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2361 if (ieee80211_is_back_req(bar
->frame_control
)) {
2363 __le16 control
, start_seq_num
;
2364 } __packed bar_data
;
2367 return RX_DROP_MONITOR
;
2369 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2370 &bar_data
, sizeof(bar_data
)))
2371 return RX_DROP_MONITOR
;
2373 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2375 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2377 return RX_DROP_MONITOR
;
2379 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2381 /* reset session timer */
2382 if (tid_agg_rx
->timeout
)
2383 mod_timer(&tid_agg_rx
->session_timer
,
2384 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2386 spin_lock(&tid_agg_rx
->reorder_lock
);
2387 /* release stored frames up to start of BAR */
2388 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2389 start_seq_num
, frames
);
2390 spin_unlock(&tid_agg_rx
->reorder_lock
);
2397 * After this point, we only want management frames,
2398 * so we can drop all remaining control frames to
2399 * cooked monitor interfaces.
2401 return RX_DROP_MONITOR
;
2404 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2405 struct ieee80211_mgmt
*mgmt
,
2408 struct ieee80211_local
*local
= sdata
->local
;
2409 struct sk_buff
*skb
;
2410 struct ieee80211_mgmt
*resp
;
2412 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2413 /* Not to own unicast address */
2417 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2418 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2419 /* Not from the current AP or not associated yet. */
2423 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2424 /* Too short SA Query request frame */
2428 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2432 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2433 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2434 memset(resp
, 0, 24);
2435 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2436 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2437 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2438 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2439 IEEE80211_STYPE_ACTION
);
2440 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2441 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2442 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2443 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2444 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2445 WLAN_SA_QUERY_TR_ID_LEN
);
2447 ieee80211_tx_skb(sdata
, skb
);
2450 static ieee80211_rx_result debug_noinline
2451 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2453 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2454 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2457 * From here on, look only at management frames.
2458 * Data and control frames are already handled,
2459 * and unknown (reserved) frames are useless.
2461 if (rx
->skb
->len
< 24)
2462 return RX_DROP_MONITOR
;
2464 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2465 return RX_DROP_MONITOR
;
2467 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2468 ieee80211_is_beacon(mgmt
->frame_control
) &&
2469 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2472 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2473 sig
= status
->signal
;
2475 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2476 rx
->skb
->data
, rx
->skb
->len
,
2478 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2481 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2482 return RX_DROP_MONITOR
;
2484 if (ieee80211_drop_unencrypted_mgmt(rx
))
2485 return RX_DROP_UNUSABLE
;
2490 static ieee80211_rx_result debug_noinline
2491 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2493 struct ieee80211_local
*local
= rx
->local
;
2494 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2495 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2496 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2497 int len
= rx
->skb
->len
;
2499 if (!ieee80211_is_action(mgmt
->frame_control
))
2502 /* drop too small frames */
2503 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2504 return RX_DROP_UNUSABLE
;
2506 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2507 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2508 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2509 return RX_DROP_UNUSABLE
;
2511 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2512 return RX_DROP_UNUSABLE
;
2514 switch (mgmt
->u
.action
.category
) {
2515 case WLAN_CATEGORY_HT
:
2516 /* reject HT action frames from stations not supporting HT */
2517 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2520 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2521 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2522 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2523 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2524 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2527 /* verify action & smps_control/chanwidth are present */
2528 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2531 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2532 case WLAN_HT_ACTION_SMPS
: {
2533 struct ieee80211_supported_band
*sband
;
2534 enum ieee80211_smps_mode smps_mode
;
2536 /* convert to HT capability */
2537 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2538 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2539 smps_mode
= IEEE80211_SMPS_OFF
;
2541 case WLAN_HT_SMPS_CONTROL_STATIC
:
2542 smps_mode
= IEEE80211_SMPS_STATIC
;
2544 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2545 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2551 /* if no change do nothing */
2552 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2554 rx
->sta
->sta
.smps_mode
= smps_mode
;
2556 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2558 rate_control_rate_update(local
, sband
, rx
->sta
,
2559 IEEE80211_RC_SMPS_CHANGED
);
2562 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2563 struct ieee80211_supported_band
*sband
;
2564 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2565 enum ieee80211_sta_rx_bandwidth new_bw
;
2567 /* If it doesn't support 40 MHz it can't change ... */
2568 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2569 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2572 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2573 new_bw
= IEEE80211_STA_RX_BW_20
;
2575 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2577 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2580 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2582 rate_control_rate_update(local
, sband
, rx
->sta
,
2583 IEEE80211_RC_BW_CHANGED
);
2591 case WLAN_CATEGORY_PUBLIC
:
2592 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2594 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2598 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2600 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2601 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2603 if (len
< offsetof(struct ieee80211_mgmt
,
2604 u
.action
.u
.ext_chan_switch
.variable
))
2607 case WLAN_CATEGORY_VHT
:
2608 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2609 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2610 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2611 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2612 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2615 /* verify action code is present */
2616 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2619 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2620 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2623 /* verify opmode is present */
2624 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2627 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2629 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2630 opmode
, status
->band
,
2638 case WLAN_CATEGORY_BACK
:
2639 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2640 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2641 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2642 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2643 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2646 /* verify action_code is present */
2647 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2650 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2651 case WLAN_ACTION_ADDBA_REQ
:
2652 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2653 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2656 case WLAN_ACTION_ADDBA_RESP
:
2657 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2658 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2661 case WLAN_ACTION_DELBA
:
2662 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2663 sizeof(mgmt
->u
.action
.u
.delba
)))
2671 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2672 /* verify action_code is present */
2673 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2676 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2677 case WLAN_ACTION_SPCT_MSR_REQ
:
2678 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2681 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2682 sizeof(mgmt
->u
.action
.u
.measurement
)))
2685 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2688 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2690 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2692 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2693 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2696 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2697 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2698 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2701 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2702 bssid
= sdata
->u
.mgd
.bssid
;
2703 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2704 bssid
= sdata
->u
.ibss
.bssid
;
2705 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2710 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2717 case WLAN_CATEGORY_SA_QUERY
:
2718 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2719 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2722 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2723 case WLAN_ACTION_SA_QUERY_REQUEST
:
2724 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2726 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2730 case WLAN_CATEGORY_SELF_PROTECTED
:
2731 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2732 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2735 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2736 case WLAN_SP_MESH_PEERING_OPEN
:
2737 case WLAN_SP_MESH_PEERING_CLOSE
:
2738 case WLAN_SP_MESH_PEERING_CONFIRM
:
2739 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2741 if (sdata
->u
.mesh
.user_mpm
)
2742 /* userspace handles this frame */
2745 case WLAN_SP_MGK_INFORM
:
2746 case WLAN_SP_MGK_ACK
:
2747 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2752 case WLAN_CATEGORY_MESH_ACTION
:
2753 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2754 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2757 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2759 if (mesh_action_is_path_sel(mgmt
) &&
2760 !mesh_path_sel_is_hwmp(sdata
))
2768 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2769 /* will return in the next handlers */
2774 rx
->sta
->rx_packets
++;
2775 dev_kfree_skb(rx
->skb
);
2779 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2780 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2781 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2783 rx
->sta
->rx_packets
++;
2787 static ieee80211_rx_result debug_noinline
2788 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2790 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2793 /* skip known-bad action frames and return them in the next handler */
2794 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2798 * Getting here means the kernel doesn't know how to handle
2799 * it, but maybe userspace does ... include returned frames
2800 * so userspace can register for those to know whether ones
2801 * it transmitted were processed or returned.
2804 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2805 sig
= status
->signal
;
2807 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2808 rx
->skb
->data
, rx
->skb
->len
, 0)) {
2810 rx
->sta
->rx_packets
++;
2811 dev_kfree_skb(rx
->skb
);
2818 static ieee80211_rx_result debug_noinline
2819 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2821 struct ieee80211_local
*local
= rx
->local
;
2822 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2823 struct sk_buff
*nskb
;
2824 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2825 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2827 if (!ieee80211_is_action(mgmt
->frame_control
))
2831 * For AP mode, hostapd is responsible for handling any action
2832 * frames that we didn't handle, including returning unknown
2833 * ones. For all other modes we will return them to the sender,
2834 * setting the 0x80 bit in the action category, as required by
2835 * 802.11-2012 9.24.4.
2836 * Newer versions of hostapd shall also use the management frame
2837 * registration mechanisms, but older ones still use cooked
2838 * monitor interfaces so push all frames there.
2840 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2841 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2842 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2843 return RX_DROP_MONITOR
;
2845 if (is_multicast_ether_addr(mgmt
->da
))
2846 return RX_DROP_MONITOR
;
2848 /* do not return rejected action frames */
2849 if (mgmt
->u
.action
.category
& 0x80)
2850 return RX_DROP_UNUSABLE
;
2852 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2855 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2857 nmgmt
->u
.action
.category
|= 0x80;
2858 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2859 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2861 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2863 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2864 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2866 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2867 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2868 IEEE80211_TX_CTL_NO_CCK_RATE
;
2869 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2871 local
->hw
.offchannel_tx_hw_queue
;
2874 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2877 dev_kfree_skb(rx
->skb
);
2881 static ieee80211_rx_result debug_noinline
2882 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2884 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2885 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2888 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2890 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2891 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2892 sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
2893 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2894 return RX_DROP_MONITOR
;
2897 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2898 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2899 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2900 /* process for all: mesh, mlme, ibss */
2902 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2903 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2904 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2905 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2906 if (is_multicast_ether_addr(mgmt
->da
) &&
2907 !is_broadcast_ether_addr(mgmt
->da
))
2908 return RX_DROP_MONITOR
;
2910 /* process only for station */
2911 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2912 return RX_DROP_MONITOR
;
2914 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2915 /* process only for ibss and mesh */
2916 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2917 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2918 return RX_DROP_MONITOR
;
2921 return RX_DROP_MONITOR
;
2924 /* queue up frame and kick off work to process it */
2925 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2926 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2927 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2929 rx
->sta
->rx_packets
++;
2934 /* TODO: use IEEE80211_RX_FRAGMENTED */
2935 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2936 struct ieee80211_rate
*rate
)
2938 struct ieee80211_sub_if_data
*sdata
;
2939 struct ieee80211_local
*local
= rx
->local
;
2940 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2941 struct net_device
*prev_dev
= NULL
;
2942 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2943 int needed_headroom
;
2946 * If cooked monitor has been processed already, then
2947 * don't do it again. If not, set the flag.
2949 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2951 rx
->flags
|= IEEE80211_RX_CMNTR
;
2953 /* If there are no cooked monitor interfaces, just free the SKB */
2954 if (!local
->cooked_mntrs
)
2957 /* vendor data is long removed here */
2958 status
->flag
&= ~RX_FLAG_RADIOTAP_VENDOR_DATA
;
2959 /* room for the radiotap header based on driver features */
2960 needed_headroom
= ieee80211_rx_radiotap_hdrlen(local
, status
, skb
);
2962 if (skb_headroom(skb
) < needed_headroom
&&
2963 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2966 /* prepend radiotap information */
2967 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2970 skb_set_mac_header(skb
, 0);
2971 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2972 skb
->pkt_type
= PACKET_OTHERHOST
;
2973 skb
->protocol
= htons(ETH_P_802_2
);
2975 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2976 if (!ieee80211_sdata_running(sdata
))
2979 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2980 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2984 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2986 skb2
->dev
= prev_dev
;
2987 netif_receive_skb(skb2
);
2991 prev_dev
= sdata
->dev
;
2992 sdata
->dev
->stats
.rx_packets
++;
2993 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2997 skb
->dev
= prev_dev
;
2998 netif_receive_skb(skb
);
3006 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
3007 ieee80211_rx_result res
)
3010 case RX_DROP_MONITOR
:
3011 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3013 rx
->sta
->rx_dropped
++;
3016 struct ieee80211_rate
*rate
= NULL
;
3017 struct ieee80211_supported_band
*sband
;
3018 struct ieee80211_rx_status
*status
;
3020 status
= IEEE80211_SKB_RXCB((rx
->skb
));
3022 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
3023 if (!(status
->flag
& RX_FLAG_HT
) &&
3024 !(status
->flag
& RX_FLAG_VHT
))
3025 rate
= &sband
->bitrates
[status
->rate_idx
];
3027 ieee80211_rx_cooked_monitor(rx
, rate
);
3030 case RX_DROP_UNUSABLE
:
3031 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3033 rx
->sta
->rx_dropped
++;
3034 dev_kfree_skb(rx
->skb
);
3037 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
3042 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
3043 struct sk_buff_head
*frames
)
3045 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3046 struct sk_buff
*skb
;
3048 #define CALL_RXH(rxh) \
3051 if (res != RX_CONTINUE) \
3055 spin_lock_bh(&rx
->local
->rx_path_lock
);
3057 while ((skb
= __skb_dequeue(frames
))) {
3059 * all the other fields are valid across frames
3060 * that belong to an aMPDU since they are on the
3061 * same TID from the same station
3065 CALL_RXH(ieee80211_rx_h_check_more_data
)
3066 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
3067 CALL_RXH(ieee80211_rx_h_sta_process
)
3068 CALL_RXH(ieee80211_rx_h_decrypt
)
3069 CALL_RXH(ieee80211_rx_h_defragment
)
3070 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
3071 /* must be after MMIC verify so header is counted in MPDU mic */
3072 #ifdef CONFIG_MAC80211_MESH
3073 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3074 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3076 CALL_RXH(ieee80211_rx_h_amsdu
)
3077 CALL_RXH(ieee80211_rx_h_data
)
3079 /* special treatment -- needs the queue */
3080 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3081 if (res
!= RX_CONTINUE
)
3084 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3085 CALL_RXH(ieee80211_rx_h_action
)
3086 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3087 CALL_RXH(ieee80211_rx_h_action_return
)
3088 CALL_RXH(ieee80211_rx_h_mgmt
)
3091 ieee80211_rx_handlers_result(rx
, res
);
3096 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3099 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3101 struct sk_buff_head reorder_release
;
3102 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3104 __skb_queue_head_init(&reorder_release
);
3106 #define CALL_RXH(rxh) \
3109 if (res != RX_CONTINUE) \
3113 CALL_RXH(ieee80211_rx_h_check
)
3115 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3117 ieee80211_rx_handlers(rx
, &reorder_release
);
3121 ieee80211_rx_handlers_result(rx
, res
);
3127 * This function makes calls into the RX path, therefore
3128 * it has to be invoked under RCU read lock.
3130 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3132 struct sk_buff_head frames
;
3133 struct ieee80211_rx_data rx
= {
3135 .sdata
= sta
->sdata
,
3136 .local
= sta
->local
,
3137 /* This is OK -- must be QoS data frame */
3138 .security_idx
= tid
,
3142 struct tid_ampdu_rx
*tid_agg_rx
;
3144 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3148 __skb_queue_head_init(&frames
);
3150 spin_lock(&tid_agg_rx
->reorder_lock
);
3151 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3152 spin_unlock(&tid_agg_rx
->reorder_lock
);
3154 ieee80211_rx_handlers(&rx
, &frames
);
3157 /* main receive path */
3159 static bool prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3160 struct ieee80211_hdr
*hdr
)
3162 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3163 struct sk_buff
*skb
= rx
->skb
;
3164 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3165 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3166 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3168 switch (sdata
->vif
.type
) {
3169 case NL80211_IFTYPE_STATION
:
3170 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3173 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3174 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3175 sdata
->u
.mgd
.use_4addr
)
3177 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3180 case NL80211_IFTYPE_ADHOC
:
3183 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3184 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3186 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3188 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3190 } else if (!multicast
&&
3191 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3192 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3194 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3195 } else if (!rx
->sta
) {
3197 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3198 rate_idx
= 0; /* TODO: HT/VHT rates */
3200 rate_idx
= status
->rate_idx
;
3201 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3205 case NL80211_IFTYPE_OCB
:
3208 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3210 } else if (!is_broadcast_ether_addr(bssid
)) {
3211 ocb_dbg(sdata
, "BSSID mismatch in OCB mode!\n");
3213 } else if (!multicast
&&
3214 !ether_addr_equal(sdata
->dev
->dev_addr
,
3216 /* if we are in promisc mode we also accept
3217 * packets not destined for us
3219 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3221 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
3222 } else if (!rx
->sta
) {
3224 if (status
->flag
& RX_FLAG_HT
)
3225 rate_idx
= 0; /* TODO: HT rates */
3227 rate_idx
= status
->rate_idx
;
3228 ieee80211_ocb_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3232 case NL80211_IFTYPE_MESH_POINT
:
3234 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3235 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3238 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3241 case NL80211_IFTYPE_AP_VLAN
:
3242 case NL80211_IFTYPE_AP
:
3244 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3246 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3248 * Accept public action frames even when the
3249 * BSSID doesn't match, this is used for P2P
3250 * and location updates. Note that mac80211
3251 * itself never looks at these frames.
3254 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3256 if (ieee80211_is_public_action(hdr
, skb
->len
))
3258 if (!ieee80211_is_beacon(hdr
->frame_control
))
3260 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3261 } else if (!ieee80211_has_tods(hdr
->frame_control
)) {
3262 /* ignore data frames to TDLS-peers */
3263 if (ieee80211_is_data(hdr
->frame_control
))
3265 /* ignore action frames to TDLS-peers */
3266 if (ieee80211_is_action(hdr
->frame_control
) &&
3267 !ether_addr_equal(bssid
, hdr
->addr1
))
3271 case NL80211_IFTYPE_WDS
:
3272 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3274 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3277 case NL80211_IFTYPE_P2P_DEVICE
:
3278 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3279 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3280 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3281 !ieee80211_is_beacon(hdr
->frame_control
))
3283 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3285 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3288 /* should never get here */
3297 * This function returns whether or not the SKB
3298 * was destined for RX processing or not, which,
3299 * if consume is true, is equivalent to whether
3300 * or not the skb was consumed.
3302 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3303 struct sk_buff
*skb
, bool consume
)
3305 struct ieee80211_local
*local
= rx
->local
;
3306 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3307 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3308 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3311 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3313 if (!prepare_for_handlers(rx
, hdr
))
3317 skb
= skb_copy(skb
, GFP_ATOMIC
);
3319 if (net_ratelimit())
3320 wiphy_debug(local
->hw
.wiphy
,
3321 "failed to copy skb for %s\n",
3329 ieee80211_invoke_rx_handlers(rx
);
3334 * This is the actual Rx frames handler. as it belongs to Rx path it must
3335 * be called with rcu_read_lock protection.
3337 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3338 struct sk_buff
*skb
)
3340 struct ieee80211_local
*local
= hw_to_local(hw
);
3341 struct ieee80211_sub_if_data
*sdata
;
3342 struct ieee80211_hdr
*hdr
;
3344 struct ieee80211_rx_data rx
;
3345 struct ieee80211_sub_if_data
*prev
;
3346 struct sta_info
*sta
, *tmp
, *prev_sta
;
3349 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3350 memset(&rx
, 0, sizeof(rx
));
3354 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3355 local
->dot11ReceivedFragmentCount
++;
3357 if (ieee80211_is_mgmt(fc
)) {
3358 /* drop frame if too short for header */
3359 if (skb
->len
< ieee80211_hdrlen(fc
))
3362 err
= skb_linearize(skb
);
3364 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3372 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3373 ieee80211_parse_qos(&rx
);
3374 ieee80211_verify_alignment(&rx
);
3376 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3377 ieee80211_is_beacon(hdr
->frame_control
)))
3378 ieee80211_scan_rx(local
, skb
);
3380 if (ieee80211_is_data(fc
)) {
3383 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3390 rx
.sdata
= prev_sta
->sdata
;
3391 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3398 rx
.sdata
= prev_sta
->sdata
;
3400 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3408 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3409 if (!ieee80211_sdata_running(sdata
))
3412 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3413 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3417 * frame is destined for this interface, but if it's
3418 * not also for the previous one we handle that after
3419 * the loop to avoid copying the SKB once too much
3427 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3429 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3435 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3438 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3447 * This is the receive path handler. It is called by a low level driver when an
3448 * 802.11 MPDU is received from the hardware.
3450 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3452 struct ieee80211_local
*local
= hw_to_local(hw
);
3453 struct ieee80211_rate
*rate
= NULL
;
3454 struct ieee80211_supported_band
*sband
;
3455 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3457 WARN_ON_ONCE(softirq_count() == 0);
3459 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3462 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3463 if (WARN_ON(!sband
))
3467 * If we're suspending, it is possible although not too likely
3468 * that we'd be receiving frames after having already partially
3469 * quiesced the stack. We can't process such frames then since
3470 * that might, for example, cause stations to be added or other
3471 * driver callbacks be invoked.
3473 if (unlikely(local
->quiescing
|| local
->suspended
))
3476 /* We might be during a HW reconfig, prevent Rx for the same reason */
3477 if (unlikely(local
->in_reconfig
))
3481 * The same happens when we're not even started,
3482 * but that's worth a warning.
3484 if (WARN_ON(!local
->started
))
3487 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3489 * Validate the rate, unless a PLCP error means that
3490 * we probably can't have a valid rate here anyway.
3493 if (status
->flag
& RX_FLAG_HT
) {
3495 * rate_idx is MCS index, which can be [0-76]
3498 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3500 * Anything else would be some sort of driver or
3501 * hardware error. The driver should catch hardware
3504 if (WARN(status
->rate_idx
> 76,
3505 "Rate marked as an HT rate but passed "
3506 "status->rate_idx is not "
3507 "an MCS index [0-76]: %d (0x%02x)\n",
3511 } else if (status
->flag
& RX_FLAG_VHT
) {
3512 if (WARN_ONCE(status
->rate_idx
> 9 ||
3514 status
->vht_nss
> 8,
3515 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3516 status
->rate_idx
, status
->vht_nss
))
3519 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3521 rate
= &sband
->bitrates
[status
->rate_idx
];
3525 status
->rx_flags
= 0;
3528 * key references and virtual interfaces are protected using RCU
3529 * and this requires that we are in a read-side RCU section during
3530 * receive processing
3535 * Frames with failed FCS/PLCP checksum are not returned,
3536 * all other frames are returned without radiotap header
3537 * if it was previously present.
3538 * Also, frames with less than 16 bytes are dropped.
3540 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3546 ieee80211_tpt_led_trig_rx(local
,
3547 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3549 __ieee80211_rx_handle_packet(hw
, skb
);
3557 EXPORT_SYMBOL(ieee80211_rx
);
3559 /* This is a version of the rx handler that can be called from hard irq
3560 * context. Post the skb on the queue and schedule the tasklet */
3561 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3563 struct ieee80211_local
*local
= hw_to_local(hw
);
3565 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3567 skb
->pkt_type
= IEEE80211_RX_MSG
;
3568 skb_queue_tail(&local
->skb_queue
, skb
);
3569 tasklet_schedule(&local
->tasklet
);
3571 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);