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
,
44 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
45 if (likely(skb
->len
> FCS_LEN
))
46 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
58 static inline bool should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
)
60 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
61 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
63 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
64 RX_FLAG_FAILED_PLCP_CRC
|
65 RX_FLAG_AMPDU_IS_ZEROLEN
))
68 if (unlikely(skb
->len
< 16 + present_fcs_len
))
71 if (ieee80211_is_ctl(hdr
->frame_control
) &&
72 !ieee80211_is_pspoll(hdr
->frame_control
) &&
73 !ieee80211_is_back_req(hdr
->frame_control
))
80 ieee80211_rx_radiotap_space(struct ieee80211_local
*local
,
81 struct ieee80211_rx_status
*status
)
85 /* always present fields */
86 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
88 /* allocate extra bitmaps */
90 len
+= 4 * hweight8(status
->chains
);
92 if (ieee80211_have_rx_timestamp(status
)) {
96 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
99 /* antenna field, if we don't have per-chain info */
103 /* padding for RX_FLAGS if necessary */
106 if (status
->flag
& RX_FLAG_HT
) /* HT info */
109 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
114 if (status
->flag
& RX_FLAG_VHT
) {
119 if (status
->chains
) {
120 /* antenna and antenna signal fields */
121 len
+= 2 * hweight8(status
->chains
);
128 * ieee80211_add_rx_radiotap_header - add radiotap header
130 * add a radiotap header containing all the fields which the hardware provided.
133 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
135 struct ieee80211_rate
*rate
,
136 int rtap_len
, bool has_fcs
)
138 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
139 struct ieee80211_radiotap_header
*rthdr
;
144 u16 channel_flags
= 0;
146 unsigned long chains
= status
->chains
;
149 if (!(has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)))
152 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
153 memset(rthdr
, 0, rtap_len
);
154 it_present
= &rthdr
->it_present
;
156 /* radiotap header, set always present flags */
157 rthdr
->it_len
= cpu_to_le16(rtap_len
);
158 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
159 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
160 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
163 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
165 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
167 BIT(IEEE80211_RADIOTAP_EXT
) |
168 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
169 put_unaligned_le32(it_present_val
, it_present
);
171 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
172 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
175 put_unaligned_le32(it_present_val
, it_present
);
177 pos
= (void *)(it_present
+ 1);
179 /* the order of the following fields is important */
181 /* IEEE80211_RADIOTAP_TSFT */
182 if (ieee80211_have_rx_timestamp(status
)) {
184 while ((pos
- (u8
*)rthdr
) & 7)
187 ieee80211_calculate_rx_timestamp(local
, status
,
190 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
194 /* IEEE80211_RADIOTAP_FLAGS */
195 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
196 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
197 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
198 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
199 if (status
->flag
& RX_FLAG_SHORTPRE
)
200 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
203 /* IEEE80211_RADIOTAP_RATE */
204 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
206 * Without rate information don't add it. If we have,
207 * MCS information is a separate field in radiotap,
208 * added below. The byte here is needed as padding
209 * for the channel though, so initialise it to 0.
214 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
215 if (status
->flag
& RX_FLAG_10MHZ
)
217 else if (status
->flag
& RX_FLAG_5MHZ
)
219 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
223 /* IEEE80211_RADIOTAP_CHANNEL */
224 put_unaligned_le16(status
->freq
, pos
);
226 if (status
->flag
& RX_FLAG_10MHZ
)
227 channel_flags
|= IEEE80211_CHAN_HALF
;
228 else if (status
->flag
& RX_FLAG_5MHZ
)
229 channel_flags
|= IEEE80211_CHAN_QUARTER
;
231 if (status
->band
== IEEE80211_BAND_5GHZ
)
232 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
233 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
234 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
235 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
236 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
238 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
240 channel_flags
|= IEEE80211_CHAN_2GHZ
;
241 put_unaligned_le16(channel_flags
, pos
);
244 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
245 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
246 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
247 *pos
= status
->signal
;
249 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
253 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
255 if (!status
->chains
) {
256 /* IEEE80211_RADIOTAP_ANTENNA */
257 *pos
= status
->antenna
;
261 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
263 /* IEEE80211_RADIOTAP_RX_FLAGS */
264 /* ensure 2 byte alignment for the 2 byte field as required */
265 if ((pos
- (u8
*)rthdr
) & 1)
267 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
268 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
269 put_unaligned_le16(rx_flags
, pos
);
272 if (status
->flag
& RX_FLAG_HT
) {
275 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
276 *pos
++ = local
->hw
.radiotap_mcs_details
;
278 if (status
->flag
& RX_FLAG_SHORT_GI
)
279 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
280 if (status
->flag
& RX_FLAG_40MHZ
)
281 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
282 if (status
->flag
& RX_FLAG_HT_GF
)
283 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
284 if (status
->flag
& RX_FLAG_LDPC
)
285 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
286 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
287 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
289 *pos
++ = status
->rate_idx
;
292 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
295 /* ensure 4 byte alignment */
296 while ((pos
- (u8
*)rthdr
) & 3)
299 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
300 put_unaligned_le32(status
->ampdu_reference
, pos
);
302 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
303 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
304 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
305 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
306 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
307 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
308 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
309 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
310 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
311 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
312 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
313 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
314 put_unaligned_le16(flags
, pos
);
316 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
317 *pos
++ = status
->ampdu_delimiter_crc
;
323 if (status
->flag
& RX_FLAG_VHT
) {
324 u16 known
= local
->hw
.radiotap_vht_details
;
326 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
327 /* known field - how to handle 80+80? */
328 if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
329 known
&= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
;
330 put_unaligned_le16(known
, pos
);
333 if (status
->flag
& RX_FLAG_SHORT_GI
)
334 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
335 /* in VHT, STBC is binary */
336 if (status
->flag
& RX_FLAG_STBC_MASK
)
337 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
338 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
339 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
342 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
344 else if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
345 *pos
++ = 0; /* marked not known above */
346 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
348 else if (status
->flag
& RX_FLAG_40MHZ
)
353 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
356 if (status
->flag
& RX_FLAG_LDPC
)
357 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
365 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
366 *pos
++ = status
->chain_signal
[chain
];
372 * This function copies a received frame to all monitor interfaces and
373 * returns a cleaned-up SKB that no longer includes the FCS nor the
374 * radiotap header the driver might have added.
376 static struct sk_buff
*
377 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
378 struct ieee80211_rate
*rate
)
380 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
381 struct ieee80211_sub_if_data
*sdata
;
383 struct sk_buff
*skb
, *skb2
;
384 struct net_device
*prev_dev
= NULL
;
385 int present_fcs_len
= 0;
388 * First, we may need to make a copy of the skb because
389 * (1) we need to modify it for radiotap (if not present), and
390 * (2) the other RX handlers will modify the skb we got.
392 * We don't need to, of course, if we aren't going to return
393 * the SKB because it has a bad FCS/PLCP checksum.
396 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
397 present_fcs_len
= FCS_LEN
;
399 /* ensure hdr->frame_control is in skb head */
400 if (!pskb_may_pull(origskb
, 2)) {
401 dev_kfree_skb(origskb
);
405 if (!local
->monitors
) {
406 if (should_drop_frame(origskb
, present_fcs_len
)) {
407 dev_kfree_skb(origskb
);
411 return remove_monitor_info(local
, origskb
);
414 /* room for the radiotap header based on driver features */
415 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
417 if (should_drop_frame(origskb
, present_fcs_len
)) {
418 /* only need to expand headroom if necessary */
423 * This shouldn't trigger often because most devices have an
424 * RX header they pull before we get here, and that should
425 * be big enough for our radiotap information. We should
426 * probably export the length to drivers so that we can have
427 * them allocate enough headroom to start with.
429 if (skb_headroom(skb
) < needed_headroom
&&
430 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
436 * Need to make a copy and possibly remove radiotap header
437 * and FCS from the original.
439 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
441 origskb
= remove_monitor_info(local
, origskb
);
447 /* prepend radiotap information */
448 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
451 skb_reset_mac_header(skb
);
452 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
453 skb
->pkt_type
= PACKET_OTHERHOST
;
454 skb
->protocol
= htons(ETH_P_802_2
);
456 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
457 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
460 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
463 if (!ieee80211_sdata_running(sdata
))
467 skb2
= skb_clone(skb
, GFP_ATOMIC
);
469 skb2
->dev
= prev_dev
;
470 netif_receive_skb(skb2
);
474 prev_dev
= sdata
->dev
;
475 sdata
->dev
->stats
.rx_packets
++;
476 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
481 netif_receive_skb(skb
);
488 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
490 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
491 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
492 int tid
, seqno_idx
, security_idx
;
494 /* does the frame have a qos control field? */
495 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
496 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
497 /* frame has qos control */
498 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
499 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
500 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
506 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
508 * Sequence numbers for management frames, QoS data
509 * frames with a broadcast/multicast address in the
510 * Address 1 field, and all non-QoS data frames sent
511 * by QoS STAs are assigned using an additional single
512 * modulo-4096 counter, [...]
514 * We also use that counter for non-QoS STAs.
516 seqno_idx
= IEEE80211_NUM_TIDS
;
518 if (ieee80211_is_mgmt(hdr
->frame_control
))
519 security_idx
= IEEE80211_NUM_TIDS
;
523 rx
->seqno_idx
= seqno_idx
;
524 rx
->security_idx
= security_idx
;
525 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
526 * For now, set skb->priority to 0 for other cases. */
527 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
531 * DOC: Packet alignment
533 * Drivers always need to pass packets that are aligned to two-byte boundaries
536 * Additionally, should, if possible, align the payload data in a way that
537 * guarantees that the contained IP header is aligned to a four-byte
538 * boundary. In the case of regular frames, this simply means aligning the
539 * payload to a four-byte boundary (because either the IP header is directly
540 * contained, or IV/RFC1042 headers that have a length divisible by four are
541 * in front of it). If the payload data is not properly aligned and the
542 * architecture doesn't support efficient unaligned operations, mac80211
543 * will align the data.
545 * With A-MSDU frames, however, the payload data address must yield two modulo
546 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
547 * push the IP header further back to a multiple of four again. Thankfully, the
548 * specs were sane enough this time around to require padding each A-MSDU
549 * subframe to a length that is a multiple of four.
551 * Padding like Atheros hardware adds which is between the 802.11 header and
552 * the payload is not supported, the driver is required to move the 802.11
553 * header to be directly in front of the payload in that case.
555 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
558 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
559 "unaligned packet at 0x%p\n", rx
->skb
->data
);
566 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
568 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
570 if (is_multicast_ether_addr(hdr
->addr1
))
573 return ieee80211_is_robust_mgmt_frame(skb
);
577 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
579 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
581 if (!is_multicast_ether_addr(hdr
->addr1
))
584 return ieee80211_is_robust_mgmt_frame(skb
);
588 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
589 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
591 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
592 struct ieee80211_mmie
*mmie
;
594 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
597 if (!ieee80211_is_robust_mgmt_frame(skb
))
598 return -1; /* not a robust management frame */
600 mmie
= (struct ieee80211_mmie
*)
601 (skb
->data
+ skb
->len
- sizeof(*mmie
));
602 if (mmie
->element_id
!= WLAN_EID_MMIE
||
603 mmie
->length
!= sizeof(*mmie
) - 2)
606 return le16_to_cpu(mmie
->key_id
);
609 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
612 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
617 fc
= hdr
->frame_control
;
618 hdrlen
= ieee80211_hdrlen(fc
);
620 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
623 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
624 keyid
&= cs
->key_idx_mask
;
625 keyid
>>= cs
->key_idx_shift
;
630 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
632 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
633 char *dev_addr
= rx
->sdata
->vif
.addr
;
635 if (ieee80211_is_data(hdr
->frame_control
)) {
636 if (is_multicast_ether_addr(hdr
->addr1
)) {
637 if (ieee80211_has_tods(hdr
->frame_control
) ||
638 !ieee80211_has_fromds(hdr
->frame_control
))
639 return RX_DROP_MONITOR
;
640 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
641 return RX_DROP_MONITOR
;
643 if (!ieee80211_has_a4(hdr
->frame_control
))
644 return RX_DROP_MONITOR
;
645 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
646 return RX_DROP_MONITOR
;
650 /* If there is not an established peer link and this is not a peer link
651 * establisment frame, beacon or probe, drop the frame.
654 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
655 struct ieee80211_mgmt
*mgmt
;
657 if (!ieee80211_is_mgmt(hdr
->frame_control
))
658 return RX_DROP_MONITOR
;
660 if (ieee80211_is_action(hdr
->frame_control
)) {
663 /* make sure category field is present */
664 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
665 return RX_DROP_MONITOR
;
667 mgmt
= (struct ieee80211_mgmt
*)hdr
;
668 category
= mgmt
->u
.action
.category
;
669 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
670 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
671 return RX_DROP_MONITOR
;
675 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
676 ieee80211_is_probe_resp(hdr
->frame_control
) ||
677 ieee80211_is_beacon(hdr
->frame_control
) ||
678 ieee80211_is_auth(hdr
->frame_control
))
681 return RX_DROP_MONITOR
;
687 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
688 struct tid_ampdu_rx
*tid_agg_rx
,
690 struct sk_buff_head
*frames
)
692 struct sk_buff_head
*skb_list
= &tid_agg_rx
->reorder_buf
[index
];
694 struct ieee80211_rx_status
*status
;
696 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
698 if (skb_queue_empty(skb_list
))
701 if (!ieee80211_rx_reorder_ready(skb_list
)) {
702 __skb_queue_purge(skb_list
);
706 /* release frames from the reorder ring buffer */
707 tid_agg_rx
->stored_mpdu_num
--;
708 while ((skb
= __skb_dequeue(skb_list
))) {
709 status
= IEEE80211_SKB_RXCB(skb
);
710 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
711 __skb_queue_tail(frames
, skb
);
715 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
718 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
719 struct tid_ampdu_rx
*tid_agg_rx
,
721 struct sk_buff_head
*frames
)
725 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
727 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
728 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
729 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
735 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
736 * the skb was added to the buffer longer than this time ago, the earlier
737 * frames that have not yet been received are assumed to be lost and the skb
738 * can be released for processing. This may also release other skb's from the
739 * reorder buffer if there are no additional gaps between the frames.
741 * Callers must hold tid_agg_rx->reorder_lock.
743 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
745 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
746 struct tid_ampdu_rx
*tid_agg_rx
,
747 struct sk_buff_head
*frames
)
751 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
753 /* release the buffer until next missing frame */
754 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
755 if (!ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
]) &&
756 tid_agg_rx
->stored_mpdu_num
) {
758 * No buffers ready to be released, but check whether any
759 * frames in the reorder buffer have timed out.
762 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
763 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
764 if (!ieee80211_rx_reorder_ready(
765 &tid_agg_rx
->reorder_buf
[j
])) {
770 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
771 HT_RX_REORDER_BUF_TIMEOUT
))
772 goto set_release_timer
;
774 /* don't leave incomplete A-MSDUs around */
775 for (i
= (index
+ 1) % tid_agg_rx
->buf_size
; i
!= j
;
776 i
= (i
+ 1) % tid_agg_rx
->buf_size
)
777 __skb_queue_purge(&tid_agg_rx
->reorder_buf
[i
]);
779 ht_dbg_ratelimited(sdata
,
780 "release an RX reorder frame due to timeout on earlier frames\n");
781 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
785 * Increment the head seq# also for the skipped slots.
787 tid_agg_rx
->head_seq_num
=
788 (tid_agg_rx
->head_seq_num
+
789 skipped
) & IEEE80211_SN_MASK
;
792 } else while (ieee80211_rx_reorder_ready(
793 &tid_agg_rx
->reorder_buf
[index
])) {
794 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
796 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
799 if (tid_agg_rx
->stored_mpdu_num
) {
800 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
802 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
803 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
804 if (ieee80211_rx_reorder_ready(
805 &tid_agg_rx
->reorder_buf
[j
]))
811 mod_timer(&tid_agg_rx
->reorder_timer
,
812 tid_agg_rx
->reorder_time
[j
] + 1 +
813 HT_RX_REORDER_BUF_TIMEOUT
);
815 del_timer(&tid_agg_rx
->reorder_timer
);
820 * As this function belongs to the RX path it must be under
821 * rcu_read_lock protection. It returns false if the frame
822 * can be processed immediately, true if it was consumed.
824 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
825 struct tid_ampdu_rx
*tid_agg_rx
,
827 struct sk_buff_head
*frames
)
829 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
830 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
831 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
832 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
833 u16 head_seq_num
, buf_size
;
837 spin_lock(&tid_agg_rx
->reorder_lock
);
840 * Offloaded BA sessions have no known starting sequence number so pick
841 * one from first Rxed frame for this tid after BA was started.
843 if (unlikely(tid_agg_rx
->auto_seq
)) {
844 tid_agg_rx
->auto_seq
= false;
845 tid_agg_rx
->ssn
= mpdu_seq_num
;
846 tid_agg_rx
->head_seq_num
= mpdu_seq_num
;
849 buf_size
= tid_agg_rx
->buf_size
;
850 head_seq_num
= tid_agg_rx
->head_seq_num
;
852 /* frame with out of date sequence number */
853 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
859 * If frame the sequence number exceeds our buffering window
860 * size release some previous frames to make room for this one.
862 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
863 head_seq_num
= ieee80211_sn_inc(
864 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
865 /* release stored frames up to new head to stack */
866 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
867 head_seq_num
, frames
);
870 /* Now the new frame is always in the range of the reordering buffer */
872 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
874 /* check if we already stored this frame */
875 if (ieee80211_rx_reorder_ready(&tid_agg_rx
->reorder_buf
[index
])) {
881 * If the current MPDU is in the right order and nothing else
882 * is stored we can process it directly, no need to buffer it.
883 * If it is first but there's something stored, we may be able
884 * to release frames after this one.
886 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
887 tid_agg_rx
->stored_mpdu_num
== 0) {
888 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
))
889 tid_agg_rx
->head_seq_num
=
890 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
895 /* put the frame in the reordering buffer */
896 __skb_queue_tail(&tid_agg_rx
->reorder_buf
[index
], skb
);
897 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
898 tid_agg_rx
->reorder_time
[index
] = jiffies
;
899 tid_agg_rx
->stored_mpdu_num
++;
900 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
904 spin_unlock(&tid_agg_rx
->reorder_lock
);
909 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
910 * true if the MPDU was buffered, false if it should be processed.
912 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
913 struct sk_buff_head
*frames
)
915 struct sk_buff
*skb
= rx
->skb
;
916 struct ieee80211_local
*local
= rx
->local
;
917 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
918 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
919 struct sta_info
*sta
= rx
->sta
;
920 struct tid_ampdu_rx
*tid_agg_rx
;
924 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
925 is_multicast_ether_addr(hdr
->addr1
))
929 * filter the QoS data rx stream according to
930 * STA/TID and check if this STA/TID is on aggregation
936 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
937 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
938 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
940 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
944 /* qos null data frames are excluded */
945 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
948 /* not part of a BA session */
949 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
950 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
953 /* not actually part of this BA session */
954 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
957 /* new, potentially un-ordered, ampdu frame - process it */
959 /* reset session timer */
960 if (tid_agg_rx
->timeout
)
961 tid_agg_rx
->last_rx
= jiffies
;
963 /* if this mpdu is fragmented - terminate rx aggregation session */
964 sc
= le16_to_cpu(hdr
->seq_ctrl
);
965 if (sc
& IEEE80211_SCTL_FRAG
) {
966 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
967 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
968 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
973 * No locking needed -- we will only ever process one
974 * RX packet at a time, and thus own tid_agg_rx. All
975 * other code manipulating it needs to (and does) make
976 * sure that we cannot get to it any more before doing
979 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
984 __skb_queue_tail(frames
, skb
);
987 static ieee80211_rx_result debug_noinline
988 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
990 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
991 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
994 * Drop duplicate 802.11 retransmissions
995 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
997 if (rx
->skb
->len
>= 24 && rx
->sta
&&
998 !ieee80211_is_ctl(hdr
->frame_control
) &&
999 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
1000 !is_multicast_ether_addr(hdr
->addr1
)) {
1001 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1002 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
1004 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1005 rx
->local
->dot11FrameDuplicateCount
++;
1006 rx
->sta
->num_duplicates
++;
1008 return RX_DROP_UNUSABLE
;
1009 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1010 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1014 if (unlikely(rx
->skb
->len
< 16)) {
1015 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
1016 return RX_DROP_MONITOR
;
1019 /* Drop disallowed frame classes based on STA auth/assoc state;
1020 * IEEE 802.11, Chap 5.5.
1022 * mac80211 filters only based on association state, i.e. it drops
1023 * Class 3 frames from not associated stations. hostapd sends
1024 * deauth/disassoc frames when needed. In addition, hostapd is
1025 * responsible for filtering on both auth and assoc states.
1028 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1029 return ieee80211_rx_mesh_check(rx
);
1031 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1032 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1033 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1034 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1035 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1037 * accept port control frames from the AP even when it's not
1038 * yet marked ASSOC to prevent a race where we don't set the
1039 * assoc bit quickly enough before it sends the first frame
1041 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1042 ieee80211_is_data_present(hdr
->frame_control
)) {
1043 unsigned int hdrlen
;
1046 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1048 if (rx
->skb
->len
< hdrlen
+ 8)
1049 return RX_DROP_MONITOR
;
1051 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1052 if (ethertype
== rx
->sdata
->control_port_protocol
)
1056 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1057 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1060 return RX_DROP_UNUSABLE
;
1062 return RX_DROP_MONITOR
;
1069 static ieee80211_rx_result debug_noinline
1070 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1072 struct ieee80211_local
*local
;
1073 struct ieee80211_hdr
*hdr
;
1074 struct sk_buff
*skb
;
1078 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1080 if (!local
->pspolling
)
1083 if (!ieee80211_has_fromds(hdr
->frame_control
))
1084 /* this is not from AP */
1087 if (!ieee80211_is_data(hdr
->frame_control
))
1090 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1091 /* AP has no more frames buffered for us */
1092 local
->pspolling
= false;
1096 /* more data bit is set, let's request a new frame from the AP */
1097 ieee80211_send_pspoll(local
, rx
->sdata
);
1102 static void sta_ps_start(struct sta_info
*sta
)
1104 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1105 struct ieee80211_local
*local
= sdata
->local
;
1108 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1109 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1110 ps
= &sdata
->bss
->ps
;
1114 atomic_inc(&ps
->num_sta_ps
);
1115 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1116 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1117 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1118 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1119 sta
->sta
.addr
, sta
->sta
.aid
);
1122 static void sta_ps_end(struct sta_info
*sta
)
1124 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1125 sta
->sta
.addr
, sta
->sta
.aid
);
1127 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1129 * Clear the flag only if the other one is still set
1130 * so that the TX path won't start TX'ing new frames
1131 * directly ... In the case that the driver flag isn't
1132 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1134 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1135 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1136 sta
->sta
.addr
, sta
->sta
.aid
);
1140 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1141 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1142 ieee80211_sta_ps_deliver_wakeup(sta
);
1145 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1147 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1150 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1152 /* Don't let the same PS state be set twice */
1153 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1154 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1158 sta_ps_start(sta_inf
);
1160 sta_ps_end(sta_inf
);
1164 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1166 static ieee80211_rx_result debug_noinline
1167 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1169 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1170 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1171 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1174 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1177 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1178 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1182 * The device handles station powersave, so don't do anything about
1183 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1184 * it to mac80211 since they're handled.)
1186 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1190 * Don't do anything if the station isn't already asleep. In
1191 * the uAPSD case, the station will probably be marked asleep,
1192 * in the PS-Poll case the station must be confused ...
1194 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1197 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1198 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1199 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1200 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1202 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1205 /* Free PS Poll skb here instead of returning RX_DROP that would
1206 * count as an dropped frame. */
1207 dev_kfree_skb(rx
->skb
);
1210 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1211 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1212 ieee80211_has_pm(hdr
->frame_control
) &&
1213 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1214 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1215 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1216 ac
= ieee802_1d_to_ac
[tid
& 7];
1219 * If this AC is not trigger-enabled do nothing.
1221 * NB: This could/should check a separate bitmap of trigger-
1222 * enabled queues, but for now we only implement uAPSD w/o
1223 * TSPEC changes to the ACs, so they're always the same.
1225 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1228 /* if we are in a service period, do nothing */
1229 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1232 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1233 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1235 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1241 static ieee80211_rx_result debug_noinline
1242 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1244 struct sta_info
*sta
= rx
->sta
;
1245 struct sk_buff
*skb
= rx
->skb
;
1246 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1247 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1254 * Update last_rx only for IBSS packets which are for the current
1255 * BSSID and for station already AUTHORIZED to avoid keeping the
1256 * current IBSS network alive in cases where other STAs start
1257 * using different BSSID. This will also give the station another
1258 * chance to restart the authentication/authorization in case
1259 * something went wrong the first time.
1261 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1262 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1263 NL80211_IFTYPE_ADHOC
);
1264 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1265 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1266 sta
->last_rx
= jiffies
;
1267 if (ieee80211_is_data(hdr
->frame_control
) &&
1268 !is_multicast_ether_addr(hdr
->addr1
)) {
1269 sta
->last_rx_rate_idx
= status
->rate_idx
;
1270 sta
->last_rx_rate_flag
= status
->flag
;
1271 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1272 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1275 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1277 * Mesh beacons will update last_rx when if they are found to
1278 * match the current local configuration when processed.
1280 sta
->last_rx
= jiffies
;
1281 if (ieee80211_is_data(hdr
->frame_control
)) {
1282 sta
->last_rx_rate_idx
= status
->rate_idx
;
1283 sta
->last_rx_rate_flag
= status
->flag
;
1284 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1285 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1289 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1292 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1293 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1295 sta
->rx_fragments
++;
1296 sta
->rx_bytes
+= rx
->skb
->len
;
1297 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1298 sta
->last_signal
= status
->signal
;
1299 ewma_add(&sta
->avg_signal
, -status
->signal
);
1302 if (status
->chains
) {
1303 sta
->chains
= status
->chains
;
1304 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1305 int signal
= status
->chain_signal
[i
];
1307 if (!(status
->chains
& BIT(i
)))
1310 sta
->chain_signal_last
[i
] = signal
;
1311 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1316 * Change STA power saving mode only at the end of a frame
1317 * exchange sequence.
1319 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1320 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1321 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1322 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1323 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1324 /* PM bit is only checked in frames where it isn't reserved,
1325 * in AP mode it's reserved in non-bufferable management frames
1326 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1328 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1329 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1330 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1331 if (!ieee80211_has_pm(hdr
->frame_control
))
1334 if (ieee80211_has_pm(hdr
->frame_control
))
1339 /* mesh power save support */
1340 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1341 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1344 * Drop (qos-)data::nullfunc frames silently, since they
1345 * are used only to control station power saving mode.
1347 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1348 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1349 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1352 * If we receive a 4-addr nullfunc frame from a STA
1353 * that was not moved to a 4-addr STA vlan yet send
1354 * the event to userspace and for older hostapd drop
1355 * the frame to the monitor interface.
1357 if (ieee80211_has_a4(hdr
->frame_control
) &&
1358 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1359 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1360 !rx
->sdata
->u
.vlan
.sta
))) {
1361 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1362 cfg80211_rx_unexpected_4addr_frame(
1363 rx
->sdata
->dev
, sta
->sta
.addr
,
1365 return RX_DROP_MONITOR
;
1368 * Update counter and free packet here to avoid
1369 * counting this as a dropped packed.
1372 dev_kfree_skb(rx
->skb
);
1377 } /* ieee80211_rx_h_sta_process */
1379 static ieee80211_rx_result debug_noinline
1380 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1382 struct sk_buff
*skb
= rx
->skb
;
1383 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1384 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1387 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1388 struct ieee80211_key
*sta_ptk
= NULL
;
1389 int mmie_keyidx
= -1;
1391 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1396 * There are four types of keys:
1397 * - GTK (group keys)
1398 * - IGTK (group keys for management frames)
1399 * - PTK (pairwise keys)
1400 * - STK (station-to-station pairwise keys)
1402 * When selecting a key, we have to distinguish between multicast
1403 * (including broadcast) and unicast frames, the latter can only
1404 * use PTKs and STKs while the former always use GTKs and IGTKs.
1405 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1406 * unicast frames can also use key indices like GTKs. Hence, if we
1407 * don't have a PTK/STK we check the key index for a WEP key.
1409 * Note that in a regular BSS, multicast frames are sent by the
1410 * AP only, associated stations unicast the frame to the AP first
1411 * which then multicasts it on their behalf.
1413 * There is also a slight problem in IBSS mode: GTKs are negotiated
1414 * with each station, that is something we don't currently handle.
1415 * The spec seems to expect that one negotiates the same key with
1416 * every station but there's no such requirement; VLANs could be
1421 * No point in finding a key and decrypting if the frame is neither
1422 * addressed to us nor a multicast frame.
1424 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1427 /* start without a key */
1429 fc
= hdr
->frame_control
;
1432 int keyid
= rx
->sta
->ptk_idx
;
1434 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1435 cs
= rx
->sta
->cipher_scheme
;
1436 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1437 if (unlikely(keyid
< 0))
1438 return RX_DROP_UNUSABLE
;
1440 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1443 if (!ieee80211_has_protected(fc
))
1444 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1446 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1448 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1449 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1451 /* Skip decryption if the frame is not protected. */
1452 if (!ieee80211_has_protected(fc
))
1454 } else if (mmie_keyidx
>= 0) {
1455 /* Broadcast/multicast robust management frame / BIP */
1456 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1457 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1460 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1461 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1462 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1464 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1466 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1467 } else if (!ieee80211_has_protected(fc
)) {
1469 * The frame was not protected, so skip decryption. However, we
1470 * need to set rx->key if there is a key that could have been
1471 * used so that the frame may be dropped if encryption would
1472 * have been expected.
1474 struct ieee80211_key
*key
= NULL
;
1475 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1478 if (ieee80211_is_mgmt(fc
) &&
1479 is_multicast_ether_addr(hdr
->addr1
) &&
1480 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1484 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1485 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1491 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1492 key
= rcu_dereference(sdata
->keys
[i
]);
1505 * The device doesn't give us the IV so we won't be
1506 * able to look up the key. That's ok though, we
1507 * don't need to decrypt the frame, we just won't
1508 * be able to keep statistics accurate.
1509 * Except for key threshold notifications, should
1510 * we somehow allow the driver to tell us which key
1511 * the hardware used if this flag is set?
1513 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1514 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1517 hdrlen
= ieee80211_hdrlen(fc
);
1520 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1522 if (unlikely(keyidx
< 0))
1523 return RX_DROP_UNUSABLE
;
1525 if (rx
->skb
->len
< 8 + hdrlen
)
1526 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1528 * no need to call ieee80211_wep_get_keyidx,
1529 * it verifies a bunch of things we've done already
1531 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1532 keyidx
= keyid
>> 6;
1535 /* check per-station GTK first, if multicast packet */
1536 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1537 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1539 /* if not found, try default key */
1541 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1544 * RSNA-protected unicast frames should always be
1545 * sent with pairwise or station-to-station keys,
1546 * but for WEP we allow using a key index as well.
1549 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1550 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1551 !is_multicast_ether_addr(hdr
->addr1
))
1557 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1558 return RX_DROP_MONITOR
;
1560 rx
->key
->tx_rx_count
++;
1561 /* TODO: add threshold stuff again */
1563 return RX_DROP_MONITOR
;
1566 switch (rx
->key
->conf
.cipher
) {
1567 case WLAN_CIPHER_SUITE_WEP40
:
1568 case WLAN_CIPHER_SUITE_WEP104
:
1569 result
= ieee80211_crypto_wep_decrypt(rx
);
1571 case WLAN_CIPHER_SUITE_TKIP
:
1572 result
= ieee80211_crypto_tkip_decrypt(rx
);
1574 case WLAN_CIPHER_SUITE_CCMP
:
1575 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1577 case WLAN_CIPHER_SUITE_AES_CMAC
:
1578 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1581 result
= ieee80211_crypto_hw_decrypt(rx
);
1584 /* the hdr variable is invalid after the decrypt handlers */
1586 /* either the frame has been decrypted or will be dropped */
1587 status
->flag
|= RX_FLAG_DECRYPTED
;
1592 static inline struct ieee80211_fragment_entry
*
1593 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1594 unsigned int frag
, unsigned int seq
, int rx_queue
,
1595 struct sk_buff
**skb
)
1597 struct ieee80211_fragment_entry
*entry
;
1599 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1600 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1601 sdata
->fragment_next
= 0;
1603 if (!skb_queue_empty(&entry
->skb_list
))
1604 __skb_queue_purge(&entry
->skb_list
);
1606 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1608 entry
->first_frag_time
= jiffies
;
1610 entry
->rx_queue
= rx_queue
;
1611 entry
->last_frag
= frag
;
1613 entry
->extra_len
= 0;
1618 static inline struct ieee80211_fragment_entry
*
1619 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1620 unsigned int frag
, unsigned int seq
,
1621 int rx_queue
, struct ieee80211_hdr
*hdr
)
1623 struct ieee80211_fragment_entry
*entry
;
1626 idx
= sdata
->fragment_next
;
1627 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1628 struct ieee80211_hdr
*f_hdr
;
1632 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1634 entry
= &sdata
->fragments
[idx
];
1635 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1636 entry
->rx_queue
!= rx_queue
||
1637 entry
->last_frag
+ 1 != frag
)
1640 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1643 * Check ftype and addresses are equal, else check next fragment
1645 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1646 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1647 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1648 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1651 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1652 __skb_queue_purge(&entry
->skb_list
);
1661 static ieee80211_rx_result debug_noinline
1662 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1664 struct ieee80211_hdr
*hdr
;
1667 unsigned int frag
, seq
;
1668 struct ieee80211_fragment_entry
*entry
;
1669 struct sk_buff
*skb
;
1670 struct ieee80211_rx_status
*status
;
1672 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1673 fc
= hdr
->frame_control
;
1675 if (ieee80211_is_ctl(fc
))
1678 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1679 frag
= sc
& IEEE80211_SCTL_FRAG
;
1681 if (likely(!ieee80211_has_morefrags(fc
) && frag
== 0))
1684 if (is_multicast_ether_addr(hdr
->addr1
)) {
1685 rx
->local
->dot11MulticastReceivedFrameCount
++;
1689 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1691 if (skb_linearize(rx
->skb
))
1692 return RX_DROP_UNUSABLE
;
1695 * skb_linearize() might change the skb->data and
1696 * previously cached variables (in this case, hdr) need to
1697 * be refreshed with the new data.
1699 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1700 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1703 /* This is the first fragment of a new frame. */
1704 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1705 rx
->seqno_idx
, &(rx
->skb
));
1706 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1707 ieee80211_has_protected(fc
)) {
1708 int queue
= rx
->security_idx
;
1709 /* Store CCMP PN so that we can verify that the next
1710 * fragment has a sequential PN value. */
1712 memcpy(entry
->last_pn
,
1713 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1714 IEEE80211_CCMP_PN_LEN
);
1719 /* This is a fragment for a frame that should already be pending in
1720 * fragment cache. Add this fragment to the end of the pending entry.
1722 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1723 rx
->seqno_idx
, hdr
);
1725 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1726 return RX_DROP_MONITOR
;
1729 /* Verify that MPDUs within one MSDU have sequential PN values.
1730 * (IEEE 802.11i, 8.3.3.4.5) */
1733 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1735 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1736 return RX_DROP_UNUSABLE
;
1737 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1738 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1743 queue
= rx
->security_idx
;
1744 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1745 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1746 return RX_DROP_UNUSABLE
;
1747 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1750 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1751 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1752 entry
->last_frag
= frag
;
1753 entry
->extra_len
+= rx
->skb
->len
;
1754 if (ieee80211_has_morefrags(fc
)) {
1759 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1760 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1761 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1762 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1764 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1765 __skb_queue_purge(&entry
->skb_list
);
1766 return RX_DROP_UNUSABLE
;
1769 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1770 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1774 /* Complete frame has been reassembled - process it now */
1775 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1776 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1780 rx
->sta
->rx_packets
++;
1781 ieee80211_led_rx(rx
->local
);
1785 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1787 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1793 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1795 struct sk_buff
*skb
= rx
->skb
;
1796 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1799 * Pass through unencrypted frames if the hardware has
1800 * decrypted them already.
1802 if (status
->flag
& RX_FLAG_DECRYPTED
)
1805 /* Drop unencrypted frames if key is set. */
1806 if (unlikely(!ieee80211_has_protected(fc
) &&
1807 !ieee80211_is_nullfunc(fc
) &&
1808 ieee80211_is_data(fc
) &&
1809 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1815 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1817 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1818 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1819 __le16 fc
= hdr
->frame_control
;
1822 * Pass through unencrypted frames if the hardware has
1823 * decrypted them already.
1825 if (status
->flag
& RX_FLAG_DECRYPTED
)
1828 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1829 if (unlikely(!ieee80211_has_protected(fc
) &&
1830 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1832 if (ieee80211_is_deauth(fc
) ||
1833 ieee80211_is_disassoc(fc
))
1834 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1839 /* BIP does not use Protected field, so need to check MMIE */
1840 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1841 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1842 if (ieee80211_is_deauth(fc
) ||
1843 ieee80211_is_disassoc(fc
))
1844 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1850 * When using MFP, Action frames are not allowed prior to
1851 * having configured keys.
1853 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1854 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
1862 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1864 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1865 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1866 bool check_port_control
= false;
1867 struct ethhdr
*ehdr
;
1870 *port_control
= false;
1871 if (ieee80211_has_a4(hdr
->frame_control
) &&
1872 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1875 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1876 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1878 if (!sdata
->u
.mgd
.use_4addr
)
1881 check_port_control
= true;
1884 if (is_multicast_ether_addr(hdr
->addr1
) &&
1885 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1888 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1892 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1893 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1894 *port_control
= true;
1895 else if (check_port_control
)
1902 * requires that rx->skb is a frame with ethernet header
1904 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1906 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1907 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1908 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1911 * Allow EAPOL frames to us/the PAE group address regardless
1912 * of whether the frame was encrypted or not.
1914 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1915 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1916 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1919 if (ieee80211_802_1x_port_control(rx
) ||
1920 ieee80211_drop_unencrypted(rx
, fc
))
1927 * requires that rx->skb is a frame with ethernet header
1930 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1932 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1933 struct net_device
*dev
= sdata
->dev
;
1934 struct sk_buff
*skb
, *xmit_skb
;
1935 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1936 struct sta_info
*dsta
;
1937 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1942 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1943 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1944 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1945 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1946 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1947 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1949 * send multicast frames both to higher layers in
1950 * local net stack and back to the wireless medium
1952 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1954 net_info_ratelimited("%s: failed to clone multicast frame\n",
1957 dsta
= sta_info_get(sdata
, skb
->data
);
1960 * The destination station is associated to
1961 * this AP (in this VLAN), so send the frame
1962 * directly to it and do not pass it to local
1971 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1973 /* 'align' will only take the values 0 or 2 here since all
1974 * frames are required to be aligned to 2-byte boundaries
1975 * when being passed to mac80211; the code here works just
1976 * as well if that isn't true, but mac80211 assumes it can
1977 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1981 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
1983 if (WARN_ON(skb_headroom(skb
) < 3)) {
1987 u8
*data
= skb
->data
;
1988 size_t len
= skb_headlen(skb
);
1990 memmove(skb
->data
, data
, len
);
1991 skb_set_tail_pointer(skb
, len
);
1998 /* deliver to local stack */
1999 skb
->protocol
= eth_type_trans(skb
, dev
);
2000 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2001 if (rx
->local
->napi
)
2002 napi_gro_receive(rx
->local
->napi
, skb
);
2004 netif_receive_skb(skb
);
2009 * Send to wireless media and increase priority by 256 to
2010 * keep the received priority instead of reclassifying
2011 * the frame (see cfg80211_classify8021d).
2013 xmit_skb
->priority
+= 256;
2014 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2015 skb_reset_network_header(xmit_skb
);
2016 skb_reset_mac_header(xmit_skb
);
2017 dev_queue_xmit(xmit_skb
);
2021 static ieee80211_rx_result debug_noinline
2022 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2024 struct net_device
*dev
= rx
->sdata
->dev
;
2025 struct sk_buff
*skb
= rx
->skb
;
2026 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2027 __le16 fc
= hdr
->frame_control
;
2028 struct sk_buff_head frame_list
;
2029 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2031 if (unlikely(!ieee80211_is_data(fc
)))
2034 if (unlikely(!ieee80211_is_data_present(fc
)))
2035 return RX_DROP_MONITOR
;
2037 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2040 if (ieee80211_has_a4(hdr
->frame_control
) &&
2041 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2042 !rx
->sdata
->u
.vlan
.sta
)
2043 return RX_DROP_UNUSABLE
;
2045 if (is_multicast_ether_addr(hdr
->addr1
) &&
2046 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2047 rx
->sdata
->u
.vlan
.sta
) ||
2048 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2049 rx
->sdata
->u
.mgd
.use_4addr
)))
2050 return RX_DROP_UNUSABLE
;
2053 __skb_queue_head_init(&frame_list
);
2055 if (skb_linearize(skb
))
2056 return RX_DROP_UNUSABLE
;
2058 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2059 rx
->sdata
->vif
.type
,
2060 rx
->local
->hw
.extra_tx_headroom
, true);
2062 while (!skb_queue_empty(&frame_list
)) {
2063 rx
->skb
= __skb_dequeue(&frame_list
);
2065 if (!ieee80211_frame_allowed(rx
, fc
)) {
2066 dev_kfree_skb(rx
->skb
);
2069 dev
->stats
.rx_packets
++;
2070 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2072 ieee80211_deliver_skb(rx
);
2078 #ifdef CONFIG_MAC80211_MESH
2079 static ieee80211_rx_result
2080 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2082 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2083 struct ieee80211_tx_info
*info
;
2084 struct ieee80211s_hdr
*mesh_hdr
;
2085 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2086 struct ieee80211_local
*local
= rx
->local
;
2087 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2088 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2089 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2092 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2093 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2095 /* make sure fixed part of mesh header is there, also checks skb len */
2096 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2097 return RX_DROP_MONITOR
;
2099 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2101 /* make sure full mesh header is there, also checks skb len */
2102 if (!pskb_may_pull(rx
->skb
,
2103 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2104 return RX_DROP_MONITOR
;
2106 /* reload pointers */
2107 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2108 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2110 /* frame is in RMC, don't forward */
2111 if (ieee80211_is_data(hdr
->frame_control
) &&
2112 is_multicast_ether_addr(hdr
->addr1
) &&
2113 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2114 return RX_DROP_MONITOR
;
2116 if (!ieee80211_is_data(hdr
->frame_control
) ||
2117 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2121 return RX_DROP_MONITOR
;
2123 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2124 struct mesh_path
*mppath
;
2128 if (is_multicast_ether_addr(hdr
->addr1
)) {
2129 mpp_addr
= hdr
->addr3
;
2130 proxied_addr
= mesh_hdr
->eaddr1
;
2131 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2132 /* has_a4 already checked in ieee80211_rx_mesh_check */
2133 mpp_addr
= hdr
->addr4
;
2134 proxied_addr
= mesh_hdr
->eaddr2
;
2136 return RX_DROP_MONITOR
;
2140 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2142 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2144 spin_lock_bh(&mppath
->state_lock
);
2145 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2146 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2147 spin_unlock_bh(&mppath
->state_lock
);
2152 /* Frame has reached destination. Don't forward */
2153 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2154 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2157 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2158 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2159 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2160 return RX_DROP_MONITOR
;
2162 skb_set_queue_mapping(skb
, q
);
2164 if (!--mesh_hdr
->ttl
) {
2165 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2169 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2172 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2174 net_info_ratelimited("%s: failed to clone mesh frame\n",
2179 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2180 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2181 info
= IEEE80211_SKB_CB(fwd_skb
);
2182 memset(info
, 0, sizeof(*info
));
2183 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2184 info
->control
.vif
= &rx
->sdata
->vif
;
2185 info
->control
.jiffies
= jiffies
;
2186 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2187 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2188 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2189 /* update power mode indication when forwarding */
2190 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2191 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2192 /* mesh power mode flags updated in mesh_nexthop_lookup */
2193 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2195 /* unable to resolve next hop */
2196 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2198 WLAN_REASON_MESH_PATH_NOFORWARD
,
2200 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2202 return RX_DROP_MONITOR
;
2205 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2206 ieee80211_add_pending_skb(local
, fwd_skb
);
2208 if (is_multicast_ether_addr(hdr
->addr1
) ||
2209 sdata
->dev
->flags
& IFF_PROMISC
)
2212 return RX_DROP_MONITOR
;
2216 static ieee80211_rx_result debug_noinline
2217 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2219 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2220 struct ieee80211_local
*local
= rx
->local
;
2221 struct net_device
*dev
= sdata
->dev
;
2222 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2223 __le16 fc
= hdr
->frame_control
;
2227 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2230 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2231 return RX_DROP_MONITOR
;
2234 * Send unexpected-4addr-frame event to hostapd. For older versions,
2235 * also drop the frame to cooked monitor interfaces.
2237 if (ieee80211_has_a4(hdr
->frame_control
) &&
2238 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2240 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2241 cfg80211_rx_unexpected_4addr_frame(
2242 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2243 return RX_DROP_MONITOR
;
2246 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2248 return RX_DROP_UNUSABLE
;
2250 if (!ieee80211_frame_allowed(rx
, fc
))
2251 return RX_DROP_MONITOR
;
2253 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2254 unlikely(port_control
) && sdata
->bss
) {
2255 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2263 dev
->stats
.rx_packets
++;
2264 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2266 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2267 !is_multicast_ether_addr(
2268 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2269 (!local
->scanning
&&
2270 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2271 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2272 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2275 ieee80211_deliver_skb(rx
);
2280 static ieee80211_rx_result debug_noinline
2281 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2283 struct sk_buff
*skb
= rx
->skb
;
2284 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2285 struct tid_ampdu_rx
*tid_agg_rx
;
2289 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2292 if (ieee80211_is_back_req(bar
->frame_control
)) {
2294 __le16 control
, start_seq_num
;
2295 } __packed bar_data
;
2298 return RX_DROP_MONITOR
;
2300 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2301 &bar_data
, sizeof(bar_data
)))
2302 return RX_DROP_MONITOR
;
2304 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2306 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2308 return RX_DROP_MONITOR
;
2310 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2312 /* reset session timer */
2313 if (tid_agg_rx
->timeout
)
2314 mod_timer(&tid_agg_rx
->session_timer
,
2315 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2317 spin_lock(&tid_agg_rx
->reorder_lock
);
2318 /* release stored frames up to start of BAR */
2319 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2320 start_seq_num
, frames
);
2321 spin_unlock(&tid_agg_rx
->reorder_lock
);
2328 * After this point, we only want management frames,
2329 * so we can drop all remaining control frames to
2330 * cooked monitor interfaces.
2332 return RX_DROP_MONITOR
;
2335 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2336 struct ieee80211_mgmt
*mgmt
,
2339 struct ieee80211_local
*local
= sdata
->local
;
2340 struct sk_buff
*skb
;
2341 struct ieee80211_mgmt
*resp
;
2343 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2344 /* Not to own unicast address */
2348 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2349 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2350 /* Not from the current AP or not associated yet. */
2354 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2355 /* Too short SA Query request frame */
2359 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2363 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2364 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2365 memset(resp
, 0, 24);
2366 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2367 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2368 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2369 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2370 IEEE80211_STYPE_ACTION
);
2371 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2372 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2373 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2374 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2375 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2376 WLAN_SA_QUERY_TR_ID_LEN
);
2378 ieee80211_tx_skb(sdata
, skb
);
2381 static ieee80211_rx_result debug_noinline
2382 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2384 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2385 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2388 * From here on, look only at management frames.
2389 * Data and control frames are already handled,
2390 * and unknown (reserved) frames are useless.
2392 if (rx
->skb
->len
< 24)
2393 return RX_DROP_MONITOR
;
2395 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2396 return RX_DROP_MONITOR
;
2398 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2399 ieee80211_is_beacon(mgmt
->frame_control
) &&
2400 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2403 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2404 sig
= status
->signal
;
2406 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2407 rx
->skb
->data
, rx
->skb
->len
,
2409 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2412 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2413 return RX_DROP_MONITOR
;
2415 if (ieee80211_drop_unencrypted_mgmt(rx
))
2416 return RX_DROP_UNUSABLE
;
2421 static ieee80211_rx_result debug_noinline
2422 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2424 struct ieee80211_local
*local
= rx
->local
;
2425 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2426 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2427 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2428 int len
= rx
->skb
->len
;
2430 if (!ieee80211_is_action(mgmt
->frame_control
))
2433 /* drop too small frames */
2434 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2435 return RX_DROP_UNUSABLE
;
2437 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2438 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2439 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2440 return RX_DROP_UNUSABLE
;
2442 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2443 return RX_DROP_UNUSABLE
;
2445 switch (mgmt
->u
.action
.category
) {
2446 case WLAN_CATEGORY_HT
:
2447 /* reject HT action frames from stations not supporting HT */
2448 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2451 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2452 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2453 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2454 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2455 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2458 /* verify action & smps_control/chanwidth are present */
2459 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2462 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2463 case WLAN_HT_ACTION_SMPS
: {
2464 struct ieee80211_supported_band
*sband
;
2465 enum ieee80211_smps_mode smps_mode
;
2467 /* convert to HT capability */
2468 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2469 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2470 smps_mode
= IEEE80211_SMPS_OFF
;
2472 case WLAN_HT_SMPS_CONTROL_STATIC
:
2473 smps_mode
= IEEE80211_SMPS_STATIC
;
2475 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2476 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2482 /* if no change do nothing */
2483 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2485 rx
->sta
->sta
.smps_mode
= smps_mode
;
2487 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2489 rate_control_rate_update(local
, sband
, rx
->sta
,
2490 IEEE80211_RC_SMPS_CHANGED
);
2493 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2494 struct ieee80211_supported_band
*sband
;
2495 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2496 enum ieee80211_sta_rx_bandwidth new_bw
;
2498 /* If it doesn't support 40 MHz it can't change ... */
2499 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2500 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2503 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2504 new_bw
= IEEE80211_STA_RX_BW_20
;
2506 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2508 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2511 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2513 rate_control_rate_update(local
, sband
, rx
->sta
,
2514 IEEE80211_RC_BW_CHANGED
);
2522 case WLAN_CATEGORY_PUBLIC
:
2523 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2525 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2529 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2531 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2532 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2534 if (len
< offsetof(struct ieee80211_mgmt
,
2535 u
.action
.u
.ext_chan_switch
.variable
))
2538 case WLAN_CATEGORY_VHT
:
2539 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2540 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2541 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2542 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2543 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2546 /* verify action code is present */
2547 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2550 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2551 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2554 /* verify opmode is present */
2555 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2558 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2560 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2561 opmode
, status
->band
,
2569 case WLAN_CATEGORY_BACK
:
2570 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2571 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2572 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2573 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2574 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2577 /* verify action_code is present */
2578 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2581 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2582 case WLAN_ACTION_ADDBA_REQ
:
2583 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2584 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2587 case WLAN_ACTION_ADDBA_RESP
:
2588 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2589 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2592 case WLAN_ACTION_DELBA
:
2593 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2594 sizeof(mgmt
->u
.action
.u
.delba
)))
2602 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2603 /* verify action_code is present */
2604 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2607 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2608 case WLAN_ACTION_SPCT_MSR_REQ
:
2609 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2612 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2613 sizeof(mgmt
->u
.action
.u
.measurement
)))
2616 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2619 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2621 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2623 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2624 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2627 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2628 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2629 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2632 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2633 bssid
= sdata
->u
.mgd
.bssid
;
2634 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2635 bssid
= sdata
->u
.ibss
.bssid
;
2636 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2641 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2648 case WLAN_CATEGORY_SA_QUERY
:
2649 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2650 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2653 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2654 case WLAN_ACTION_SA_QUERY_REQUEST
:
2655 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2657 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2661 case WLAN_CATEGORY_SELF_PROTECTED
:
2662 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2663 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2666 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2667 case WLAN_SP_MESH_PEERING_OPEN
:
2668 case WLAN_SP_MESH_PEERING_CLOSE
:
2669 case WLAN_SP_MESH_PEERING_CONFIRM
:
2670 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2672 if (sdata
->u
.mesh
.user_mpm
)
2673 /* userspace handles this frame */
2676 case WLAN_SP_MGK_INFORM
:
2677 case WLAN_SP_MGK_ACK
:
2678 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2683 case WLAN_CATEGORY_MESH_ACTION
:
2684 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2685 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2688 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2690 if (mesh_action_is_path_sel(mgmt
) &&
2691 !mesh_path_sel_is_hwmp(sdata
))
2699 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2700 /* will return in the next handlers */
2705 rx
->sta
->rx_packets
++;
2706 dev_kfree_skb(rx
->skb
);
2710 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2711 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2712 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2714 rx
->sta
->rx_packets
++;
2718 static ieee80211_rx_result debug_noinline
2719 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2721 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2724 /* skip known-bad action frames and return them in the next handler */
2725 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2729 * Getting here means the kernel doesn't know how to handle
2730 * it, but maybe userspace does ... include returned frames
2731 * so userspace can register for those to know whether ones
2732 * it transmitted were processed or returned.
2735 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2736 sig
= status
->signal
;
2738 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2739 rx
->skb
->data
, rx
->skb
->len
, 0)) {
2741 rx
->sta
->rx_packets
++;
2742 dev_kfree_skb(rx
->skb
);
2749 static ieee80211_rx_result debug_noinline
2750 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2752 struct ieee80211_local
*local
= rx
->local
;
2753 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2754 struct sk_buff
*nskb
;
2755 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2756 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2758 if (!ieee80211_is_action(mgmt
->frame_control
))
2762 * For AP mode, hostapd is responsible for handling any action
2763 * frames that we didn't handle, including returning unknown
2764 * ones. For all other modes we will return them to the sender,
2765 * setting the 0x80 bit in the action category, as required by
2766 * 802.11-2012 9.24.4.
2767 * Newer versions of hostapd shall also use the management frame
2768 * registration mechanisms, but older ones still use cooked
2769 * monitor interfaces so push all frames there.
2771 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2772 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2773 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2774 return RX_DROP_MONITOR
;
2776 if (is_multicast_ether_addr(mgmt
->da
))
2777 return RX_DROP_MONITOR
;
2779 /* do not return rejected action frames */
2780 if (mgmt
->u
.action
.category
& 0x80)
2781 return RX_DROP_UNUSABLE
;
2783 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2786 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2788 nmgmt
->u
.action
.category
|= 0x80;
2789 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2790 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2792 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2794 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2795 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2797 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2798 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2799 IEEE80211_TX_CTL_NO_CCK_RATE
;
2800 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2802 local
->hw
.offchannel_tx_hw_queue
;
2805 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2808 dev_kfree_skb(rx
->skb
);
2812 static ieee80211_rx_result debug_noinline
2813 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2815 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2816 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2819 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2821 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2822 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2823 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2824 return RX_DROP_MONITOR
;
2827 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2828 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2829 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2830 /* process for all: mesh, mlme, ibss */
2832 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2833 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2834 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2835 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2836 if (is_multicast_ether_addr(mgmt
->da
) &&
2837 !is_broadcast_ether_addr(mgmt
->da
))
2838 return RX_DROP_MONITOR
;
2840 /* process only for station */
2841 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2842 return RX_DROP_MONITOR
;
2844 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2845 /* process only for ibss and mesh */
2846 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2847 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2848 return RX_DROP_MONITOR
;
2851 return RX_DROP_MONITOR
;
2854 /* queue up frame and kick off work to process it */
2855 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2856 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2857 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2859 rx
->sta
->rx_packets
++;
2864 /* TODO: use IEEE80211_RX_FRAGMENTED */
2865 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2866 struct ieee80211_rate
*rate
)
2868 struct ieee80211_sub_if_data
*sdata
;
2869 struct ieee80211_local
*local
= rx
->local
;
2870 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2871 struct net_device
*prev_dev
= NULL
;
2872 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2873 int needed_headroom
;
2876 * If cooked monitor has been processed already, then
2877 * don't do it again. If not, set the flag.
2879 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2881 rx
->flags
|= IEEE80211_RX_CMNTR
;
2883 /* If there are no cooked monitor interfaces, just free the SKB */
2884 if (!local
->cooked_mntrs
)
2887 /* room for the radiotap header based on driver features */
2888 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
2890 if (skb_headroom(skb
) < needed_headroom
&&
2891 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2894 /* prepend radiotap information */
2895 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2898 skb_set_mac_header(skb
, 0);
2899 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2900 skb
->pkt_type
= PACKET_OTHERHOST
;
2901 skb
->protocol
= htons(ETH_P_802_2
);
2903 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2904 if (!ieee80211_sdata_running(sdata
))
2907 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2908 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2912 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2914 skb2
->dev
= prev_dev
;
2915 netif_receive_skb(skb2
);
2919 prev_dev
= sdata
->dev
;
2920 sdata
->dev
->stats
.rx_packets
++;
2921 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2925 skb
->dev
= prev_dev
;
2926 netif_receive_skb(skb
);
2934 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2935 ieee80211_rx_result res
)
2938 case RX_DROP_MONITOR
:
2939 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2941 rx
->sta
->rx_dropped
++;
2944 struct ieee80211_rate
*rate
= NULL
;
2945 struct ieee80211_supported_band
*sband
;
2946 struct ieee80211_rx_status
*status
;
2948 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2950 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2951 if (!(status
->flag
& RX_FLAG_HT
) &&
2952 !(status
->flag
& RX_FLAG_VHT
))
2953 rate
= &sband
->bitrates
[status
->rate_idx
];
2955 ieee80211_rx_cooked_monitor(rx
, rate
);
2958 case RX_DROP_UNUSABLE
:
2959 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2961 rx
->sta
->rx_dropped
++;
2962 dev_kfree_skb(rx
->skb
);
2965 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2970 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2971 struct sk_buff_head
*frames
)
2973 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2974 struct sk_buff
*skb
;
2976 #define CALL_RXH(rxh) \
2979 if (res != RX_CONTINUE) \
2983 spin_lock_bh(&rx
->local
->rx_path_lock
);
2985 while ((skb
= __skb_dequeue(frames
))) {
2987 * all the other fields are valid across frames
2988 * that belong to an aMPDU since they are on the
2989 * same TID from the same station
2993 CALL_RXH(ieee80211_rx_h_check_more_data
)
2994 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2995 CALL_RXH(ieee80211_rx_h_sta_process
)
2996 CALL_RXH(ieee80211_rx_h_decrypt
)
2997 CALL_RXH(ieee80211_rx_h_defragment
)
2998 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2999 /* must be after MMIC verify so header is counted in MPDU mic */
3000 #ifdef CONFIG_MAC80211_MESH
3001 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3002 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3004 CALL_RXH(ieee80211_rx_h_amsdu
)
3005 CALL_RXH(ieee80211_rx_h_data
)
3007 /* special treatment -- needs the queue */
3008 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3009 if (res
!= RX_CONTINUE
)
3012 CALL_RXH(ieee80211_rx_h_mgmt_check
)
3013 CALL_RXH(ieee80211_rx_h_action
)
3014 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
3015 CALL_RXH(ieee80211_rx_h_action_return
)
3016 CALL_RXH(ieee80211_rx_h_mgmt
)
3019 ieee80211_rx_handlers_result(rx
, res
);
3024 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3027 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3029 struct sk_buff_head reorder_release
;
3030 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3032 __skb_queue_head_init(&reorder_release
);
3034 #define CALL_RXH(rxh) \
3037 if (res != RX_CONTINUE) \
3041 CALL_RXH(ieee80211_rx_h_check
)
3043 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3045 ieee80211_rx_handlers(rx
, &reorder_release
);
3049 ieee80211_rx_handlers_result(rx
, res
);
3055 * This function makes calls into the RX path, therefore
3056 * it has to be invoked under RCU read lock.
3058 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3060 struct sk_buff_head frames
;
3061 struct ieee80211_rx_data rx
= {
3063 .sdata
= sta
->sdata
,
3064 .local
= sta
->local
,
3065 /* This is OK -- must be QoS data frame */
3066 .security_idx
= tid
,
3070 struct tid_ampdu_rx
*tid_agg_rx
;
3072 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3076 __skb_queue_head_init(&frames
);
3078 spin_lock(&tid_agg_rx
->reorder_lock
);
3079 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3080 spin_unlock(&tid_agg_rx
->reorder_lock
);
3082 ieee80211_rx_handlers(&rx
, &frames
);
3085 /* main receive path */
3087 static bool prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3088 struct ieee80211_hdr
*hdr
)
3090 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3091 struct sk_buff
*skb
= rx
->skb
;
3092 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3093 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3094 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3096 switch (sdata
->vif
.type
) {
3097 case NL80211_IFTYPE_STATION
:
3098 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3101 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3102 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3103 sdata
->u
.mgd
.use_4addr
)
3105 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3108 case NL80211_IFTYPE_ADHOC
:
3111 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3112 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3114 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3116 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3118 } else if (!multicast
&&
3119 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3120 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3122 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3123 } else if (!rx
->sta
) {
3125 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3126 rate_idx
= 0; /* TODO: HT/VHT rates */
3128 rate_idx
= status
->rate_idx
;
3129 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3133 case NL80211_IFTYPE_MESH_POINT
:
3135 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3136 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3139 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3142 case NL80211_IFTYPE_AP_VLAN
:
3143 case NL80211_IFTYPE_AP
:
3145 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3147 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3149 * Accept public action frames even when the
3150 * BSSID doesn't match, this is used for P2P
3151 * and location updates. Note that mac80211
3152 * itself never looks at these frames.
3155 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3157 if (ieee80211_is_public_action(hdr
, skb
->len
))
3159 if (!ieee80211_is_beacon(hdr
->frame_control
))
3161 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3162 } else if (!ieee80211_has_tods(hdr
->frame_control
)) {
3163 /* ignore data frames to TDLS-peers */
3164 if (ieee80211_is_data(hdr
->frame_control
))
3166 /* ignore action frames to TDLS-peers */
3167 if (ieee80211_is_action(hdr
->frame_control
) &&
3168 !ether_addr_equal(bssid
, hdr
->addr1
))
3172 case NL80211_IFTYPE_WDS
:
3173 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3175 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3178 case NL80211_IFTYPE_P2P_DEVICE
:
3179 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3180 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3181 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3182 !ieee80211_is_beacon(hdr
->frame_control
))
3184 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3186 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3189 /* should never get here */
3198 * This function returns whether or not the SKB
3199 * was destined for RX processing or not, which,
3200 * if consume is true, is equivalent to whether
3201 * or not the skb was consumed.
3203 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3204 struct sk_buff
*skb
, bool consume
)
3206 struct ieee80211_local
*local
= rx
->local
;
3207 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3208 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3209 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3212 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3214 if (!prepare_for_handlers(rx
, hdr
))
3218 skb
= skb_copy(skb
, GFP_ATOMIC
);
3220 if (net_ratelimit())
3221 wiphy_debug(local
->hw
.wiphy
,
3222 "failed to copy skb for %s\n",
3230 ieee80211_invoke_rx_handlers(rx
);
3235 * This is the actual Rx frames handler. as it belongs to Rx path it must
3236 * be called with rcu_read_lock protection.
3238 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3239 struct sk_buff
*skb
)
3241 struct ieee80211_local
*local
= hw_to_local(hw
);
3242 struct ieee80211_sub_if_data
*sdata
;
3243 struct ieee80211_hdr
*hdr
;
3245 struct ieee80211_rx_data rx
;
3246 struct ieee80211_sub_if_data
*prev
;
3247 struct sta_info
*sta
, *tmp
, *prev_sta
;
3250 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3251 memset(&rx
, 0, sizeof(rx
));
3255 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3256 local
->dot11ReceivedFragmentCount
++;
3258 if (ieee80211_is_mgmt(fc
)) {
3259 /* drop frame if too short for header */
3260 if (skb
->len
< ieee80211_hdrlen(fc
))
3263 err
= skb_linearize(skb
);
3265 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3273 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3274 ieee80211_parse_qos(&rx
);
3275 ieee80211_verify_alignment(&rx
);
3277 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3278 ieee80211_is_beacon(hdr
->frame_control
)))
3279 ieee80211_scan_rx(local
, skb
);
3281 if (ieee80211_is_data(fc
)) {
3284 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3291 rx
.sdata
= prev_sta
->sdata
;
3292 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3299 rx
.sdata
= prev_sta
->sdata
;
3301 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3309 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3310 if (!ieee80211_sdata_running(sdata
))
3313 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3314 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3318 * frame is destined for this interface, but if it's
3319 * not also for the previous one we handle that after
3320 * the loop to avoid copying the SKB once too much
3328 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3330 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3336 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3339 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3348 * This is the receive path handler. It is called by a low level driver when an
3349 * 802.11 MPDU is received from the hardware.
3351 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3353 struct ieee80211_local
*local
= hw_to_local(hw
);
3354 struct ieee80211_rate
*rate
= NULL
;
3355 struct ieee80211_supported_band
*sband
;
3356 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3358 WARN_ON_ONCE(softirq_count() == 0);
3360 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3363 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3364 if (WARN_ON(!sband
))
3368 * If we're suspending, it is possible although not too likely
3369 * that we'd be receiving frames after having already partially
3370 * quiesced the stack. We can't process such frames then since
3371 * that might, for example, cause stations to be added or other
3372 * driver callbacks be invoked.
3374 if (unlikely(local
->quiescing
|| local
->suspended
))
3377 /* We might be during a HW reconfig, prevent Rx for the same reason */
3378 if (unlikely(local
->in_reconfig
))
3382 * The same happens when we're not even started,
3383 * but that's worth a warning.
3385 if (WARN_ON(!local
->started
))
3388 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3390 * Validate the rate, unless a PLCP error means that
3391 * we probably can't have a valid rate here anyway.
3394 if (status
->flag
& RX_FLAG_HT
) {
3396 * rate_idx is MCS index, which can be [0-76]
3399 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3401 * Anything else would be some sort of driver or
3402 * hardware error. The driver should catch hardware
3405 if (WARN(status
->rate_idx
> 76,
3406 "Rate marked as an HT rate but passed "
3407 "status->rate_idx is not "
3408 "an MCS index [0-76]: %d (0x%02x)\n",
3412 } else if (status
->flag
& RX_FLAG_VHT
) {
3413 if (WARN_ONCE(status
->rate_idx
> 9 ||
3415 status
->vht_nss
> 8,
3416 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3417 status
->rate_idx
, status
->vht_nss
))
3420 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3422 rate
= &sband
->bitrates
[status
->rate_idx
];
3426 status
->rx_flags
= 0;
3429 * key references and virtual interfaces are protected using RCU
3430 * and this requires that we are in a read-side RCU section during
3431 * receive processing
3436 * Frames with failed FCS/PLCP checksum are not returned,
3437 * all other frames are returned without radiotap header
3438 * if it was previously present.
3439 * Also, frames with less than 16 bytes are dropped.
3441 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3447 ieee80211_tpt_led_trig_rx(local
,
3448 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3450 __ieee80211_rx_handle_packet(hw
, skb
);
3458 EXPORT_SYMBOL(ieee80211_rx
);
3460 /* This is a version of the rx handler that can be called from hard irq
3461 * context. Post the skb on the queue and schedule the tasklet */
3462 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3464 struct ieee80211_local
*local
= hw_to_local(hw
);
3466 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3468 skb
->pkt_type
= IEEE80211_RX_MSG
;
3469 skb_queue_tail(&local
->skb_queue
, skb
);
3470 tasklet_schedule(&local
->tasklet
);
3472 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);