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
7 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/jiffies.h>
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/skbuff.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <linux/bitops.h>
23 #include <net/mac80211.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
37 static inline void ieee80211_rx_stats(struct net_device
*dev
, u32 len
)
39 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
41 u64_stats_update_begin(&tstats
->syncp
);
43 tstats
->rx_bytes
+= len
;
44 u64_stats_update_end(&tstats
->syncp
);
47 static u8
*ieee80211_get_bssid(struct ieee80211_hdr
*hdr
, size_t len
,
48 enum nl80211_iftype type
)
50 __le16 fc
= hdr
->frame_control
;
52 if (ieee80211_is_data(fc
)) {
53 if (len
< 24) /* drop incorrect hdr len (data) */
56 if (ieee80211_has_a4(fc
))
58 if (ieee80211_has_tods(fc
))
60 if (ieee80211_has_fromds(fc
))
66 if (ieee80211_is_mgmt(fc
)) {
67 if (len
< 24) /* drop incorrect hdr len (mgmt) */
72 if (ieee80211_is_ctl(fc
)) {
73 if (ieee80211_is_pspoll(fc
))
76 if (ieee80211_is_back_req(fc
)) {
78 case NL80211_IFTYPE_STATION
:
80 case NL80211_IFTYPE_AP
:
81 case NL80211_IFTYPE_AP_VLAN
:
84 break; /* fall through to the return */
93 * monitor mode reception
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
98 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
100 unsigned int rtap_vendor_space
)
102 if (ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
)) {
103 if (likely(skb
->len
> FCS_LEN
))
104 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
113 __pskb_pull(skb
, rtap_vendor_space
);
118 static inline bool should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
,
119 unsigned int rtap_vendor_space
)
121 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
122 struct ieee80211_hdr
*hdr
;
124 hdr
= (void *)(skb
->data
+ rtap_vendor_space
);
126 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
127 RX_FLAG_FAILED_PLCP_CRC
|
128 RX_FLAG_ONLY_MONITOR
))
131 if (unlikely(skb
->len
< 16 + present_fcs_len
+ rtap_vendor_space
))
134 if (ieee80211_is_ctl(hdr
->frame_control
) &&
135 !ieee80211_is_pspoll(hdr
->frame_control
) &&
136 !ieee80211_is_back_req(hdr
->frame_control
))
143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local
*local
,
144 struct ieee80211_rx_status
*status
,
149 /* always present fields */
150 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
152 /* allocate extra bitmaps */
154 len
+= 4 * hweight8(status
->chains
);
156 if (ieee80211_have_rx_timestamp(status
)) {
160 if (ieee80211_hw_check(&local
->hw
, SIGNAL_DBM
))
163 /* antenna field, if we don't have per-chain info */
167 /* padding for RX_FLAGS if necessary */
170 if (status
->flag
& RX_FLAG_HT
) /* HT info */
173 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
178 if (status
->flag
& RX_FLAG_VHT
) {
183 if (local
->hw
.radiotap_timestamp
.units_pos
>= 0) {
188 if (status
->chains
) {
189 /* antenna and antenna signal fields */
190 len
+= 2 * hweight8(status
->chains
);
193 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
194 struct ieee80211_vendor_radiotap
*rtap
= (void *)skb
->data
;
196 /* vendor presence bitmap */
198 /* alignment for fixed 6-byte vendor data header */
200 /* vendor data header */
202 if (WARN_ON(rtap
->align
== 0))
204 len
= ALIGN(len
, rtap
->align
);
205 len
+= rtap
->len
+ rtap
->pad
;
212 * ieee80211_add_rx_radiotap_header - add radiotap header
214 * add a radiotap header containing all the fields which the hardware provided.
217 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
219 struct ieee80211_rate
*rate
,
220 int rtap_len
, bool has_fcs
)
222 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
223 struct ieee80211_radiotap_header
*rthdr
;
228 u16 channel_flags
= 0;
230 unsigned long chains
= status
->chains
;
231 struct ieee80211_vendor_radiotap rtap
= {};
233 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
234 rtap
= *(struct ieee80211_vendor_radiotap
*)skb
->data
;
235 /* rtap.len and rtap.pad are undone immediately */
236 skb_pull(skb
, sizeof(rtap
) + rtap
.len
+ rtap
.pad
);
240 if (!(has_fcs
&& ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
)))
243 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
244 memset(rthdr
, 0, rtap_len
- rtap
.len
- rtap
.pad
);
245 it_present
= &rthdr
->it_present
;
247 /* radiotap header, set always present flags */
248 rthdr
->it_len
= cpu_to_le16(rtap_len
);
249 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
250 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
251 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
254 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
256 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
258 BIT(IEEE80211_RADIOTAP_EXT
) |
259 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
260 put_unaligned_le32(it_present_val
, it_present
);
262 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
263 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
266 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
267 it_present_val
|= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE
) |
268 BIT(IEEE80211_RADIOTAP_EXT
);
269 put_unaligned_le32(it_present_val
, it_present
);
271 it_present_val
= rtap
.present
;
274 put_unaligned_le32(it_present_val
, it_present
);
276 pos
= (void *)(it_present
+ 1);
278 /* the order of the following fields is important */
280 /* IEEE80211_RADIOTAP_TSFT */
281 if (ieee80211_have_rx_timestamp(status
)) {
283 while ((pos
- (u8
*)rthdr
) & 7)
286 ieee80211_calculate_rx_timestamp(local
, status
,
289 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
293 /* IEEE80211_RADIOTAP_FLAGS */
294 if (has_fcs
&& ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
))
295 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
296 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
297 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
298 if (status
->flag
& RX_FLAG_SHORTPRE
)
299 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
302 /* IEEE80211_RADIOTAP_RATE */
303 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
305 * Without rate information don't add it. If we have,
306 * MCS information is a separate field in radiotap,
307 * added below. The byte here is needed as padding
308 * for the channel though, so initialise it to 0.
313 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
314 if (status
->flag
& RX_FLAG_10MHZ
)
316 else if (status
->flag
& RX_FLAG_5MHZ
)
318 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
322 /* IEEE80211_RADIOTAP_CHANNEL */
323 put_unaligned_le16(status
->freq
, pos
);
325 if (status
->flag
& RX_FLAG_10MHZ
)
326 channel_flags
|= IEEE80211_CHAN_HALF
;
327 else if (status
->flag
& RX_FLAG_5MHZ
)
328 channel_flags
|= IEEE80211_CHAN_QUARTER
;
330 if (status
->band
== NL80211_BAND_5GHZ
)
331 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
332 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
333 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
334 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
335 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
337 channel_flags
|= IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
;
339 channel_flags
|= IEEE80211_CHAN_2GHZ
;
340 put_unaligned_le16(channel_flags
, pos
);
343 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
344 if (ieee80211_hw_check(&local
->hw
, SIGNAL_DBM
) &&
345 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
346 *pos
= status
->signal
;
348 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
352 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
354 if (!status
->chains
) {
355 /* IEEE80211_RADIOTAP_ANTENNA */
356 *pos
= status
->antenna
;
360 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
362 /* IEEE80211_RADIOTAP_RX_FLAGS */
363 /* ensure 2 byte alignment for the 2 byte field as required */
364 if ((pos
- (u8
*)rthdr
) & 1)
366 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
367 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
368 put_unaligned_le16(rx_flags
, pos
);
371 if (status
->flag
& RX_FLAG_HT
) {
374 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
375 *pos
++ = local
->hw
.radiotap_mcs_details
;
377 if (status
->flag
& RX_FLAG_SHORT_GI
)
378 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
379 if (status
->flag
& RX_FLAG_40MHZ
)
380 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
381 if (status
->flag
& RX_FLAG_HT_GF
)
382 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
383 if (status
->flag
& RX_FLAG_LDPC
)
384 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
385 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
386 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
388 *pos
++ = status
->rate_idx
;
391 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
394 /* ensure 4 byte alignment */
395 while ((pos
- (u8
*)rthdr
) & 3)
398 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
399 put_unaligned_le32(status
->ampdu_reference
, pos
);
401 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
402 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
403 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
404 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
405 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
406 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
407 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
408 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
409 put_unaligned_le16(flags
, pos
);
411 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
412 *pos
++ = status
->ampdu_delimiter_crc
;
418 if (status
->flag
& RX_FLAG_VHT
) {
419 u16 known
= local
->hw
.radiotap_vht_details
;
421 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
422 put_unaligned_le16(known
, pos
);
425 if (status
->flag
& RX_FLAG_SHORT_GI
)
426 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
427 /* in VHT, STBC is binary */
428 if (status
->flag
& RX_FLAG_STBC_MASK
)
429 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
430 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
431 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
434 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
436 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
438 else if (status
->flag
& RX_FLAG_40MHZ
)
443 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
446 if (status
->flag
& RX_FLAG_LDPC
)
447 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
455 if (local
->hw
.radiotap_timestamp
.units_pos
>= 0) {
457 u8 flags
= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT
;
460 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP
);
462 /* ensure 8 byte alignment */
463 while ((pos
- (u8
*)rthdr
) & 7)
466 put_unaligned_le64(status
->device_timestamp
, pos
);
469 if (local
->hw
.radiotap_timestamp
.accuracy
>= 0) {
470 accuracy
= local
->hw
.radiotap_timestamp
.accuracy
;
471 flags
|= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY
;
473 put_unaligned_le16(accuracy
, pos
);
476 *pos
++ = local
->hw
.radiotap_timestamp
.units_pos
;
480 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
481 *pos
++ = status
->chain_signal
[chain
];
485 if (status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
) {
486 /* ensure 2 byte alignment for the vendor field as required */
487 if ((pos
- (u8
*)rthdr
) & 1)
489 *pos
++ = rtap
.oui
[0];
490 *pos
++ = rtap
.oui
[1];
491 *pos
++ = rtap
.oui
[2];
493 put_unaligned_le16(rtap
.len
, pos
);
495 /* align the actual payload as requested */
496 while ((pos
- (u8
*)rthdr
) & (rtap
.align
- 1))
498 /* data (and possible padding) already follows */
503 * This function copies a received frame to all monitor interfaces and
504 * returns a cleaned-up SKB that no longer includes the FCS nor the
505 * radiotap header the driver might have added.
507 static struct sk_buff
*
508 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
509 struct ieee80211_rate
*rate
)
511 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
512 struct ieee80211_sub_if_data
*sdata
;
513 int rt_hdrlen
, needed_headroom
;
514 struct sk_buff
*skb
, *skb2
;
515 struct net_device
*prev_dev
= NULL
;
516 int present_fcs_len
= 0;
517 unsigned int rtap_vendor_space
= 0;
518 struct ieee80211_mgmt
*mgmt
;
519 struct ieee80211_sub_if_data
*monitor_sdata
=
520 rcu_dereference(local
->monitor_sdata
);
522 if (unlikely(status
->flag
& RX_FLAG_RADIOTAP_VENDOR_DATA
)) {
523 struct ieee80211_vendor_radiotap
*rtap
= (void *)origskb
->data
;
525 rtap_vendor_space
= sizeof(*rtap
) + rtap
->len
+ rtap
->pad
;
529 * First, we may need to make a copy of the skb because
530 * (1) we need to modify it for radiotap (if not present), and
531 * (2) the other RX handlers will modify the skb we got.
533 * We don't need to, of course, if we aren't going to return
534 * the SKB because it has a bad FCS/PLCP checksum.
537 if (ieee80211_hw_check(&local
->hw
, RX_INCLUDES_FCS
))
538 present_fcs_len
= FCS_LEN
;
540 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
541 if (!pskb_may_pull(origskb
, 2 + rtap_vendor_space
)) {
542 dev_kfree_skb(origskb
);
546 if (!local
->monitors
|| (status
->flag
& RX_FLAG_SKIP_MONITOR
)) {
547 if (should_drop_frame(origskb
, present_fcs_len
,
548 rtap_vendor_space
)) {
549 dev_kfree_skb(origskb
);
553 return remove_monitor_info(local
, origskb
, rtap_vendor_space
);
556 /* room for the radiotap header based on driver features */
557 rt_hdrlen
= ieee80211_rx_radiotap_hdrlen(local
, status
, origskb
);
558 needed_headroom
= rt_hdrlen
- rtap_vendor_space
;
560 if (should_drop_frame(origskb
, present_fcs_len
, rtap_vendor_space
)) {
561 /* only need to expand headroom if necessary */
566 * This shouldn't trigger often because most devices have an
567 * RX header they pull before we get here, and that should
568 * be big enough for our radiotap information. We should
569 * probably export the length to drivers so that we can have
570 * them allocate enough headroom to start with.
572 if (skb_headroom(skb
) < needed_headroom
&&
573 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
579 * Need to make a copy and possibly remove radiotap header
580 * and FCS from the original.
582 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
584 origskb
= remove_monitor_info(local
, origskb
,
591 /* prepend radiotap information */
592 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, rt_hdrlen
, true);
594 skb_reset_mac_header(skb
);
595 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
596 skb
->pkt_type
= PACKET_OTHERHOST
;
597 skb
->protocol
= htons(ETH_P_802_2
);
599 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
600 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
603 if (sdata
->u
.mntr
.flags
& MONITOR_FLAG_COOK_FRAMES
)
606 if (!ieee80211_sdata_running(sdata
))
610 skb2
= skb_clone(skb
, GFP_ATOMIC
);
612 skb2
->dev
= prev_dev
;
613 netif_receive_skb(skb2
);
617 prev_dev
= sdata
->dev
;
618 ieee80211_rx_stats(sdata
->dev
, skb
->len
);
621 mgmt
= (void *)skb
->data
;
623 skb
->len
>= IEEE80211_MIN_ACTION_SIZE
+ 1 + VHT_MUMIMO_GROUPS_DATA_LEN
&&
624 ieee80211_is_action(mgmt
->frame_control
) &&
625 mgmt
->u
.action
.category
== WLAN_CATEGORY_VHT
&&
626 mgmt
->u
.action
.u
.vht_group_notif
.action_code
== WLAN_VHT_ACTION_GROUPID_MGMT
&&
627 is_valid_ether_addr(monitor_sdata
->u
.mntr
.mu_follow_addr
) &&
628 ether_addr_equal(mgmt
->da
, monitor_sdata
->u
.mntr
.mu_follow_addr
)) {
629 struct sk_buff
*mu_skb
= skb_copy(skb
, GFP_ATOMIC
);
632 mu_skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
633 skb_queue_tail(&monitor_sdata
->skb_queue
, mu_skb
);
634 ieee80211_queue_work(&local
->hw
, &monitor_sdata
->work
);
640 netif_receive_skb(skb
);
647 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
649 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
650 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
651 int tid
, seqno_idx
, security_idx
;
653 /* does the frame have a qos control field? */
654 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
655 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
656 /* frame has qos control */
657 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
658 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
659 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
665 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
667 * Sequence numbers for management frames, QoS data
668 * frames with a broadcast/multicast address in the
669 * Address 1 field, and all non-QoS data frames sent
670 * by QoS STAs are assigned using an additional single
671 * modulo-4096 counter, [...]
673 * We also use that counter for non-QoS STAs.
675 seqno_idx
= IEEE80211_NUM_TIDS
;
677 if (ieee80211_is_mgmt(hdr
->frame_control
))
678 security_idx
= IEEE80211_NUM_TIDS
;
682 rx
->seqno_idx
= seqno_idx
;
683 rx
->security_idx
= security_idx
;
684 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
685 * For now, set skb->priority to 0 for other cases. */
686 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
690 * DOC: Packet alignment
692 * Drivers always need to pass packets that are aligned to two-byte boundaries
695 * Additionally, should, if possible, align the payload data in a way that
696 * guarantees that the contained IP header is aligned to a four-byte
697 * boundary. In the case of regular frames, this simply means aligning the
698 * payload to a four-byte boundary (because either the IP header is directly
699 * contained, or IV/RFC1042 headers that have a length divisible by four are
700 * in front of it). If the payload data is not properly aligned and the
701 * architecture doesn't support efficient unaligned operations, mac80211
702 * will align the data.
704 * With A-MSDU frames, however, the payload data address must yield two modulo
705 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
706 * push the IP header further back to a multiple of four again. Thankfully, the
707 * specs were sane enough this time around to require padding each A-MSDU
708 * subframe to a length that is a multiple of four.
710 * Padding like Atheros hardware adds which is between the 802.11 header and
711 * the payload is not supported, the driver is required to move the 802.11
712 * header to be directly in front of the payload in that case.
714 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
716 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
717 WARN_ON_ONCE((unsigned long)rx
->skb
->data
& 1);
724 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
726 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
728 if (is_multicast_ether_addr(hdr
->addr1
))
731 return ieee80211_is_robust_mgmt_frame(skb
);
735 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
737 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
739 if (!is_multicast_ether_addr(hdr
->addr1
))
742 return ieee80211_is_robust_mgmt_frame(skb
);
746 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
747 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
749 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
750 struct ieee80211_mmie
*mmie
;
751 struct ieee80211_mmie_16
*mmie16
;
753 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
756 if (!ieee80211_is_robust_mgmt_frame(skb
))
757 return -1; /* not a robust management frame */
759 mmie
= (struct ieee80211_mmie
*)
760 (skb
->data
+ skb
->len
- sizeof(*mmie
));
761 if (mmie
->element_id
== WLAN_EID_MMIE
&&
762 mmie
->length
== sizeof(*mmie
) - 2)
763 return le16_to_cpu(mmie
->key_id
);
765 mmie16
= (struct ieee80211_mmie_16
*)
766 (skb
->data
+ skb
->len
- sizeof(*mmie16
));
767 if (skb
->len
>= 24 + sizeof(*mmie16
) &&
768 mmie16
->element_id
== WLAN_EID_MMIE
&&
769 mmie16
->length
== sizeof(*mmie16
) - 2)
770 return le16_to_cpu(mmie16
->key_id
);
775 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
778 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
783 fc
= hdr
->frame_control
;
784 hdrlen
= ieee80211_hdrlen(fc
);
786 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
789 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
790 keyid
&= cs
->key_idx_mask
;
791 keyid
>>= cs
->key_idx_shift
;
796 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
798 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
799 char *dev_addr
= rx
->sdata
->vif
.addr
;
801 if (ieee80211_is_data(hdr
->frame_control
)) {
802 if (is_multicast_ether_addr(hdr
->addr1
)) {
803 if (ieee80211_has_tods(hdr
->frame_control
) ||
804 !ieee80211_has_fromds(hdr
->frame_control
))
805 return RX_DROP_MONITOR
;
806 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
807 return RX_DROP_MONITOR
;
809 if (!ieee80211_has_a4(hdr
->frame_control
))
810 return RX_DROP_MONITOR
;
811 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
812 return RX_DROP_MONITOR
;
816 /* If there is not an established peer link and this is not a peer link
817 * establisment frame, beacon or probe, drop the frame.
820 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
821 struct ieee80211_mgmt
*mgmt
;
823 if (!ieee80211_is_mgmt(hdr
->frame_control
))
824 return RX_DROP_MONITOR
;
826 if (ieee80211_is_action(hdr
->frame_control
)) {
829 /* make sure category field is present */
830 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
831 return RX_DROP_MONITOR
;
833 mgmt
= (struct ieee80211_mgmt
*)hdr
;
834 category
= mgmt
->u
.action
.category
;
835 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
836 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
837 return RX_DROP_MONITOR
;
841 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
842 ieee80211_is_probe_resp(hdr
->frame_control
) ||
843 ieee80211_is_beacon(hdr
->frame_control
) ||
844 ieee80211_is_auth(hdr
->frame_control
))
847 return RX_DROP_MONITOR
;
853 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx
*tid_agg_rx
,
856 struct sk_buff_head
*frames
= &tid_agg_rx
->reorder_buf
[index
];
857 struct sk_buff
*tail
= skb_peek_tail(frames
);
858 struct ieee80211_rx_status
*status
;
860 if (tid_agg_rx
->reorder_buf_filtered
& BIT_ULL(index
))
866 status
= IEEE80211_SKB_RXCB(tail
);
867 if (status
->flag
& RX_FLAG_AMSDU_MORE
)
873 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
874 struct tid_ampdu_rx
*tid_agg_rx
,
876 struct sk_buff_head
*frames
)
878 struct sk_buff_head
*skb_list
= &tid_agg_rx
->reorder_buf
[index
];
880 struct ieee80211_rx_status
*status
;
882 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
884 if (skb_queue_empty(skb_list
))
887 if (!ieee80211_rx_reorder_ready(tid_agg_rx
, index
)) {
888 __skb_queue_purge(skb_list
);
892 /* release frames from the reorder ring buffer */
893 tid_agg_rx
->stored_mpdu_num
--;
894 while ((skb
= __skb_dequeue(skb_list
))) {
895 status
= IEEE80211_SKB_RXCB(skb
);
896 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
897 __skb_queue_tail(frames
, skb
);
901 tid_agg_rx
->reorder_buf_filtered
&= ~BIT_ULL(index
);
902 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
905 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
906 struct tid_ampdu_rx
*tid_agg_rx
,
908 struct sk_buff_head
*frames
)
912 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
914 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
915 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
916 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
922 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
923 * the skb was added to the buffer longer than this time ago, the earlier
924 * frames that have not yet been received are assumed to be lost and the skb
925 * can be released for processing. This may also release other skb's from the
926 * reorder buffer if there are no additional gaps between the frames.
928 * Callers must hold tid_agg_rx->reorder_lock.
930 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
932 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
933 struct tid_ampdu_rx
*tid_agg_rx
,
934 struct sk_buff_head
*frames
)
938 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
940 /* release the buffer until next missing frame */
941 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
942 if (!ieee80211_rx_reorder_ready(tid_agg_rx
, index
) &&
943 tid_agg_rx
->stored_mpdu_num
) {
945 * No buffers ready to be released, but check whether any
946 * frames in the reorder buffer have timed out.
949 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
950 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
951 if (!ieee80211_rx_reorder_ready(tid_agg_rx
, j
)) {
956 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
957 HT_RX_REORDER_BUF_TIMEOUT
))
958 goto set_release_timer
;
960 /* don't leave incomplete A-MSDUs around */
961 for (i
= (index
+ 1) % tid_agg_rx
->buf_size
; i
!= j
;
962 i
= (i
+ 1) % tid_agg_rx
->buf_size
)
963 __skb_queue_purge(&tid_agg_rx
->reorder_buf
[i
]);
965 ht_dbg_ratelimited(sdata
,
966 "release an RX reorder frame due to timeout on earlier frames\n");
967 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
971 * Increment the head seq# also for the skipped slots.
973 tid_agg_rx
->head_seq_num
=
974 (tid_agg_rx
->head_seq_num
+
975 skipped
) & IEEE80211_SN_MASK
;
978 } else while (ieee80211_rx_reorder_ready(tid_agg_rx
, index
)) {
979 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
981 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
984 if (tid_agg_rx
->stored_mpdu_num
) {
985 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
987 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
988 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
989 if (ieee80211_rx_reorder_ready(tid_agg_rx
, j
))
995 if (!tid_agg_rx
->removed
)
996 mod_timer(&tid_agg_rx
->reorder_timer
,
997 tid_agg_rx
->reorder_time
[j
] + 1 +
998 HT_RX_REORDER_BUF_TIMEOUT
);
1000 del_timer(&tid_agg_rx
->reorder_timer
);
1005 * As this function belongs to the RX path it must be under
1006 * rcu_read_lock protection. It returns false if the frame
1007 * can be processed immediately, true if it was consumed.
1009 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
1010 struct tid_ampdu_rx
*tid_agg_rx
,
1011 struct sk_buff
*skb
,
1012 struct sk_buff_head
*frames
)
1014 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1015 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1016 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1017 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1018 u16 head_seq_num
, buf_size
;
1022 spin_lock(&tid_agg_rx
->reorder_lock
);
1025 * Offloaded BA sessions have no known starting sequence number so pick
1026 * one from first Rxed frame for this tid after BA was started.
1028 if (unlikely(tid_agg_rx
->auto_seq
)) {
1029 tid_agg_rx
->auto_seq
= false;
1030 tid_agg_rx
->ssn
= mpdu_seq_num
;
1031 tid_agg_rx
->head_seq_num
= mpdu_seq_num
;
1034 buf_size
= tid_agg_rx
->buf_size
;
1035 head_seq_num
= tid_agg_rx
->head_seq_num
;
1037 /* frame with out of date sequence number */
1038 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
1044 * If frame the sequence number exceeds our buffering window
1045 * size release some previous frames to make room for this one.
1047 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
1048 head_seq_num
= ieee80211_sn_inc(
1049 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
1050 /* release stored frames up to new head to stack */
1051 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
1052 head_seq_num
, frames
);
1055 /* Now the new frame is always in the range of the reordering buffer */
1057 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
1059 /* check if we already stored this frame */
1060 if (ieee80211_rx_reorder_ready(tid_agg_rx
, index
)) {
1066 * If the current MPDU is in the right order and nothing else
1067 * is stored we can process it directly, no need to buffer it.
1068 * If it is first but there's something stored, we may be able
1069 * to release frames after this one.
1071 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
1072 tid_agg_rx
->stored_mpdu_num
== 0) {
1073 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
))
1074 tid_agg_rx
->head_seq_num
=
1075 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
1080 /* put the frame in the reordering buffer */
1081 __skb_queue_tail(&tid_agg_rx
->reorder_buf
[index
], skb
);
1082 if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1083 tid_agg_rx
->reorder_time
[index
] = jiffies
;
1084 tid_agg_rx
->stored_mpdu_num
++;
1085 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
1089 spin_unlock(&tid_agg_rx
->reorder_lock
);
1094 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095 * true if the MPDU was buffered, false if it should be processed.
1097 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
1098 struct sk_buff_head
*frames
)
1100 struct sk_buff
*skb
= rx
->skb
;
1101 struct ieee80211_local
*local
= rx
->local
;
1102 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1103 struct sta_info
*sta
= rx
->sta
;
1104 struct tid_ampdu_rx
*tid_agg_rx
;
1108 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
1109 is_multicast_ether_addr(hdr
->addr1
))
1113 * filter the QoS data rx stream according to
1114 * STA/TID and check if this STA/TID is on aggregation
1120 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
1121 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
1122 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1124 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
1126 if (ack_policy
== IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
1127 !test_bit(tid
, rx
->sta
->ampdu_mlme
.agg_session_valid
) &&
1128 !test_and_set_bit(tid
, rx
->sta
->ampdu_mlme
.unexpected_agg
))
1129 ieee80211_send_delba(rx
->sdata
, rx
->sta
->sta
.addr
, tid
,
1130 WLAN_BACK_RECIPIENT
,
1131 WLAN_REASON_QSTA_REQUIRE_SETUP
);
1135 /* qos null data frames are excluded */
1136 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
1139 /* not part of a BA session */
1140 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
1141 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
1144 /* new, potentially un-ordered, ampdu frame - process it */
1146 /* reset session timer */
1147 if (tid_agg_rx
->timeout
)
1148 tid_agg_rx
->last_rx
= jiffies
;
1150 /* if this mpdu is fragmented - terminate rx aggregation session */
1151 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1152 if (sc
& IEEE80211_SCTL_FRAG
) {
1153 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
1154 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
1155 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
1160 * No locking needed -- we will only ever process one
1161 * RX packet at a time, and thus own tid_agg_rx. All
1162 * other code manipulating it needs to (and does) make
1163 * sure that we cannot get to it any more before doing
1166 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
1171 __skb_queue_tail(frames
, skb
);
1174 static ieee80211_rx_result debug_noinline
1175 ieee80211_rx_h_check_dup(struct ieee80211_rx_data
*rx
)
1177 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1178 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1180 if (status
->flag
& RX_FLAG_DUP_VALIDATED
)
1184 * Drop duplicate 802.11 retransmissions
1185 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1188 if (rx
->skb
->len
< 24)
1191 if (ieee80211_is_ctl(hdr
->frame_control
) ||
1192 ieee80211_is_qos_nullfunc(hdr
->frame_control
) ||
1193 is_multicast_ether_addr(hdr
->addr1
))
1199 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
1200 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] == hdr
->seq_ctrl
)) {
1201 I802_DEBUG_INC(rx
->local
->dot11FrameDuplicateCount
);
1202 rx
->sta
->rx_stats
.num_duplicates
++;
1203 return RX_DROP_UNUSABLE
;
1204 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
1205 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
1211 static ieee80211_rx_result debug_noinline
1212 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
1214 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1216 /* Drop disallowed frame classes based on STA auth/assoc state;
1217 * IEEE 802.11, Chap 5.5.
1219 * mac80211 filters only based on association state, i.e. it drops
1220 * Class 3 frames from not associated stations. hostapd sends
1221 * deauth/disassoc frames when needed. In addition, hostapd is
1222 * responsible for filtering on both auth and assoc states.
1225 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1226 return ieee80211_rx_mesh_check(rx
);
1228 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1229 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1230 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1231 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1232 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
1233 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1235 * accept port control frames from the AP even when it's not
1236 * yet marked ASSOC to prevent a race where we don't set the
1237 * assoc bit quickly enough before it sends the first frame
1239 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1240 ieee80211_is_data_present(hdr
->frame_control
)) {
1241 unsigned int hdrlen
;
1244 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1246 if (rx
->skb
->len
< hdrlen
+ 8)
1247 return RX_DROP_MONITOR
;
1249 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1250 if (ethertype
== rx
->sdata
->control_port_protocol
)
1254 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1255 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1258 return RX_DROP_UNUSABLE
;
1260 return RX_DROP_MONITOR
;
1267 static ieee80211_rx_result debug_noinline
1268 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1270 struct ieee80211_local
*local
;
1271 struct ieee80211_hdr
*hdr
;
1272 struct sk_buff
*skb
;
1276 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1278 if (!local
->pspolling
)
1281 if (!ieee80211_has_fromds(hdr
->frame_control
))
1282 /* this is not from AP */
1285 if (!ieee80211_is_data(hdr
->frame_control
))
1288 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1289 /* AP has no more frames buffered for us */
1290 local
->pspolling
= false;
1294 /* more data bit is set, let's request a new frame from the AP */
1295 ieee80211_send_pspoll(local
, rx
->sdata
);
1300 static void sta_ps_start(struct sta_info
*sta
)
1302 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1303 struct ieee80211_local
*local
= sdata
->local
;
1307 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1308 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1309 ps
= &sdata
->bss
->ps
;
1313 atomic_inc(&ps
->num_sta_ps
);
1314 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1315 if (!ieee80211_hw_check(&local
->hw
, AP_LINK_PS
))
1316 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1317 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1318 sta
->sta
.addr
, sta
->sta
.aid
);
1320 ieee80211_clear_fast_xmit(sta
);
1322 if (!sta
->sta
.txq
[0])
1325 for (tid
= 0; tid
< ARRAY_SIZE(sta
->sta
.txq
); tid
++) {
1326 if (txq_has_queue(sta
->sta
.txq
[tid
]))
1327 set_bit(tid
, &sta
->txq_buffered_tids
);
1329 clear_bit(tid
, &sta
->txq_buffered_tids
);
1333 static void sta_ps_end(struct sta_info
*sta
)
1335 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1336 sta
->sta
.addr
, sta
->sta
.aid
);
1338 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1340 * Clear the flag only if the other one is still set
1341 * so that the TX path won't start TX'ing new frames
1342 * directly ... In the case that the driver flag isn't
1343 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1345 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1346 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1347 sta
->sta
.addr
, sta
->sta
.aid
);
1351 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1352 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1353 ieee80211_sta_ps_deliver_wakeup(sta
);
1356 int ieee80211_sta_ps_transition(struct ieee80211_sta
*pubsta
, bool start
)
1358 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1361 WARN_ON(!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
));
1363 /* Don't let the same PS state be set twice */
1364 in_ps
= test_sta_flag(sta
, WLAN_STA_PS_STA
);
1365 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1375 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1377 void ieee80211_sta_pspoll(struct ieee80211_sta
*pubsta
)
1379 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1381 if (test_sta_flag(sta
, WLAN_STA_SP
))
1384 if (!test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1385 ieee80211_sta_ps_deliver_poll_response(sta
);
1387 set_sta_flag(sta
, WLAN_STA_PSPOLL
);
1389 EXPORT_SYMBOL(ieee80211_sta_pspoll
);
1391 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta
*pubsta
, u8 tid
)
1393 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1394 int ac
= ieee80211_ac_from_tid(tid
);
1397 * If this AC is not trigger-enabled do nothing unless the
1398 * driver is calling us after it already checked.
1400 * NB: This could/should check a separate bitmap of trigger-
1401 * enabled queues, but for now we only implement uAPSD w/o
1402 * TSPEC changes to the ACs, so they're always the same.
1404 if (!(sta
->sta
.uapsd_queues
& ieee80211_ac_to_qos_mask
[ac
]) &&
1405 tid
!= IEEE80211_NUM_TIDS
)
1408 /* if we are in a service period, do nothing */
1409 if (test_sta_flag(sta
, WLAN_STA_SP
))
1412 if (!test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1413 ieee80211_sta_ps_deliver_uapsd(sta
);
1415 set_sta_flag(sta
, WLAN_STA_UAPSD
);
1417 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger
);
1419 static ieee80211_rx_result debug_noinline
1420 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1422 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1423 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1424 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1429 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1430 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1434 * The device handles station powersave, so don't do anything about
1435 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1436 * it to mac80211 since they're handled.)
1438 if (ieee80211_hw_check(&sdata
->local
->hw
, AP_LINK_PS
))
1442 * Don't do anything if the station isn't already asleep. In
1443 * the uAPSD case, the station will probably be marked asleep,
1444 * in the PS-Poll case the station must be confused ...
1446 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1449 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1450 ieee80211_sta_pspoll(&rx
->sta
->sta
);
1452 /* Free PS Poll skb here instead of returning RX_DROP that would
1453 * count as an dropped frame. */
1454 dev_kfree_skb(rx
->skb
);
1457 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1458 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1459 ieee80211_has_pm(hdr
->frame_control
) &&
1460 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1461 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1464 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1466 ieee80211_sta_uapsd_trigger(&rx
->sta
->sta
, tid
);
1472 static ieee80211_rx_result debug_noinline
1473 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1475 struct sta_info
*sta
= rx
->sta
;
1476 struct sk_buff
*skb
= rx
->skb
;
1477 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1478 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1485 * Update last_rx only for IBSS packets which are for the current
1486 * BSSID and for station already AUTHORIZED to avoid keeping the
1487 * current IBSS network alive in cases where other STAs start
1488 * using different BSSID. This will also give the station another
1489 * chance to restart the authentication/authorization in case
1490 * something went wrong the first time.
1492 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1493 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1494 NL80211_IFTYPE_ADHOC
);
1495 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1496 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1497 sta
->rx_stats
.last_rx
= jiffies
;
1498 if (ieee80211_is_data(hdr
->frame_control
) &&
1499 !is_multicast_ether_addr(hdr
->addr1
))
1500 sta
->rx_stats
.last_rate
=
1501 sta_stats_encode_rate(status
);
1503 } else if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_OCB
) {
1504 sta
->rx_stats
.last_rx
= jiffies
;
1505 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1507 * Mesh beacons will update last_rx when if they are found to
1508 * match the current local configuration when processed.
1510 sta
->rx_stats
.last_rx
= jiffies
;
1511 if (ieee80211_is_data(hdr
->frame_control
))
1512 sta
->rx_stats
.last_rate
= sta_stats_encode_rate(status
);
1515 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1516 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1518 sta
->rx_stats
.fragments
++;
1520 u64_stats_update_begin(&rx
->sta
->rx_stats
.syncp
);
1521 sta
->rx_stats
.bytes
+= rx
->skb
->len
;
1522 u64_stats_update_end(&rx
->sta
->rx_stats
.syncp
);
1524 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1525 sta
->rx_stats
.last_signal
= status
->signal
;
1526 ewma_signal_add(&sta
->rx_stats_avg
.signal
, -status
->signal
);
1529 if (status
->chains
) {
1530 sta
->rx_stats
.chains
= status
->chains
;
1531 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1532 int signal
= status
->chain_signal
[i
];
1534 if (!(status
->chains
& BIT(i
)))
1537 sta
->rx_stats
.chain_signal_last
[i
] = signal
;
1538 ewma_signal_add(&sta
->rx_stats_avg
.chain_signal
[i
],
1544 * Change STA power saving mode only at the end of a frame
1545 * exchange sequence.
1547 if (!ieee80211_hw_check(&sta
->local
->hw
, AP_LINK_PS
) &&
1548 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1549 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1550 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1551 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1552 /* PM bit is only checked in frames where it isn't reserved,
1553 * in AP mode it's reserved in non-bufferable management frames
1554 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1556 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1557 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1558 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1559 if (!ieee80211_has_pm(hdr
->frame_control
))
1562 if (ieee80211_has_pm(hdr
->frame_control
))
1567 /* mesh power save support */
1568 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1569 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1572 * Drop (qos-)data::nullfunc frames silently, since they
1573 * are used only to control station power saving mode.
1575 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1576 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1577 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1580 * If we receive a 4-addr nullfunc frame from a STA
1581 * that was not moved to a 4-addr STA vlan yet send
1582 * the event to userspace and for older hostapd drop
1583 * the frame to the monitor interface.
1585 if (ieee80211_has_a4(hdr
->frame_control
) &&
1586 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1587 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1588 !rx
->sdata
->u
.vlan
.sta
))) {
1589 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1590 cfg80211_rx_unexpected_4addr_frame(
1591 rx
->sdata
->dev
, sta
->sta
.addr
,
1593 return RX_DROP_MONITOR
;
1596 * Update counter and free packet here to avoid
1597 * counting this as a dropped packed.
1599 sta
->rx_stats
.packets
++;
1600 dev_kfree_skb(rx
->skb
);
1605 } /* ieee80211_rx_h_sta_process */
1607 static ieee80211_rx_result debug_noinline
1608 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1610 struct sk_buff
*skb
= rx
->skb
;
1611 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1612 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1615 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1616 struct ieee80211_key
*sta_ptk
= NULL
;
1617 int mmie_keyidx
= -1;
1619 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1624 * There are four types of keys:
1625 * - GTK (group keys)
1626 * - IGTK (group keys for management frames)
1627 * - PTK (pairwise keys)
1628 * - STK (station-to-station pairwise keys)
1630 * When selecting a key, we have to distinguish between multicast
1631 * (including broadcast) and unicast frames, the latter can only
1632 * use PTKs and STKs while the former always use GTKs and IGTKs.
1633 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1634 * unicast frames can also use key indices like GTKs. Hence, if we
1635 * don't have a PTK/STK we check the key index for a WEP key.
1637 * Note that in a regular BSS, multicast frames are sent by the
1638 * AP only, associated stations unicast the frame to the AP first
1639 * which then multicasts it on their behalf.
1641 * There is also a slight problem in IBSS mode: GTKs are negotiated
1642 * with each station, that is something we don't currently handle.
1643 * The spec seems to expect that one negotiates the same key with
1644 * every station but there's no such requirement; VLANs could be
1648 /* start without a key */
1650 fc
= hdr
->frame_control
;
1653 int keyid
= rx
->sta
->ptk_idx
;
1655 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1656 cs
= rx
->sta
->cipher_scheme
;
1657 keyid
= ieee80211_get_cs_keyid(cs
, rx
->skb
);
1658 if (unlikely(keyid
< 0))
1659 return RX_DROP_UNUSABLE
;
1661 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1664 if (!ieee80211_has_protected(fc
))
1665 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1667 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1669 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1670 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1672 /* Skip decryption if the frame is not protected. */
1673 if (!ieee80211_has_protected(fc
))
1675 } else if (mmie_keyidx
>= 0) {
1676 /* Broadcast/multicast robust management frame / BIP */
1677 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1678 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1681 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1682 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1683 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1685 if (ieee80211_is_group_privacy_action(skb
) &&
1686 test_sta_flag(rx
->sta
, WLAN_STA_MFP
))
1687 return RX_DROP_MONITOR
;
1689 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1692 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1693 } else if (!ieee80211_has_protected(fc
)) {
1695 * The frame was not protected, so skip decryption. However, we
1696 * need to set rx->key if there is a key that could have been
1697 * used so that the frame may be dropped if encryption would
1698 * have been expected.
1700 struct ieee80211_key
*key
= NULL
;
1701 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1704 if (ieee80211_is_mgmt(fc
) &&
1705 is_multicast_ether_addr(hdr
->addr1
) &&
1706 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1710 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1711 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1717 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1718 key
= rcu_dereference(sdata
->keys
[i
]);
1731 * The device doesn't give us the IV so we won't be
1732 * able to look up the key. That's ok though, we
1733 * don't need to decrypt the frame, we just won't
1734 * be able to keep statistics accurate.
1735 * Except for key threshold notifications, should
1736 * we somehow allow the driver to tell us which key
1737 * the hardware used if this flag is set?
1739 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1740 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1743 hdrlen
= ieee80211_hdrlen(fc
);
1746 keyidx
= ieee80211_get_cs_keyid(cs
, rx
->skb
);
1748 if (unlikely(keyidx
< 0))
1749 return RX_DROP_UNUSABLE
;
1751 if (rx
->skb
->len
< 8 + hdrlen
)
1752 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1754 * no need to call ieee80211_wep_get_keyidx,
1755 * it verifies a bunch of things we've done already
1757 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1758 keyidx
= keyid
>> 6;
1761 /* check per-station GTK first, if multicast packet */
1762 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1763 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1765 /* if not found, try default key */
1767 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1770 * RSNA-protected unicast frames should always be
1771 * sent with pairwise or station-to-station keys,
1772 * but for WEP we allow using a key index as well.
1775 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1776 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1777 !is_multicast_ether_addr(hdr
->addr1
))
1783 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1784 return RX_DROP_MONITOR
;
1786 /* TODO: add threshold stuff again */
1788 return RX_DROP_MONITOR
;
1791 switch (rx
->key
->conf
.cipher
) {
1792 case WLAN_CIPHER_SUITE_WEP40
:
1793 case WLAN_CIPHER_SUITE_WEP104
:
1794 result
= ieee80211_crypto_wep_decrypt(rx
);
1796 case WLAN_CIPHER_SUITE_TKIP
:
1797 result
= ieee80211_crypto_tkip_decrypt(rx
);
1799 case WLAN_CIPHER_SUITE_CCMP
:
1800 result
= ieee80211_crypto_ccmp_decrypt(
1801 rx
, IEEE80211_CCMP_MIC_LEN
);
1803 case WLAN_CIPHER_SUITE_CCMP_256
:
1804 result
= ieee80211_crypto_ccmp_decrypt(
1805 rx
, IEEE80211_CCMP_256_MIC_LEN
);
1807 case WLAN_CIPHER_SUITE_AES_CMAC
:
1808 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1810 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1811 result
= ieee80211_crypto_aes_cmac_256_decrypt(rx
);
1813 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1814 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1815 result
= ieee80211_crypto_aes_gmac_decrypt(rx
);
1817 case WLAN_CIPHER_SUITE_GCMP
:
1818 case WLAN_CIPHER_SUITE_GCMP_256
:
1819 result
= ieee80211_crypto_gcmp_decrypt(rx
);
1822 result
= ieee80211_crypto_hw_decrypt(rx
);
1825 /* the hdr variable is invalid after the decrypt handlers */
1827 /* either the frame has been decrypted or will be dropped */
1828 status
->flag
|= RX_FLAG_DECRYPTED
;
1833 static inline struct ieee80211_fragment_entry
*
1834 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1835 unsigned int frag
, unsigned int seq
, int rx_queue
,
1836 struct sk_buff
**skb
)
1838 struct ieee80211_fragment_entry
*entry
;
1840 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1841 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1842 sdata
->fragment_next
= 0;
1844 if (!skb_queue_empty(&entry
->skb_list
))
1845 __skb_queue_purge(&entry
->skb_list
);
1847 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1849 entry
->first_frag_time
= jiffies
;
1851 entry
->rx_queue
= rx_queue
;
1852 entry
->last_frag
= frag
;
1853 entry
->check_sequential_pn
= false;
1854 entry
->extra_len
= 0;
1859 static inline struct ieee80211_fragment_entry
*
1860 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1861 unsigned int frag
, unsigned int seq
,
1862 int rx_queue
, struct ieee80211_hdr
*hdr
)
1864 struct ieee80211_fragment_entry
*entry
;
1867 idx
= sdata
->fragment_next
;
1868 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1869 struct ieee80211_hdr
*f_hdr
;
1873 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1875 entry
= &sdata
->fragments
[idx
];
1876 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1877 entry
->rx_queue
!= rx_queue
||
1878 entry
->last_frag
+ 1 != frag
)
1881 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1884 * Check ftype and addresses are equal, else check next fragment
1886 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1887 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1888 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1889 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1892 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1893 __skb_queue_purge(&entry
->skb_list
);
1902 static ieee80211_rx_result debug_noinline
1903 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1905 struct ieee80211_hdr
*hdr
;
1908 unsigned int frag
, seq
;
1909 struct ieee80211_fragment_entry
*entry
;
1910 struct sk_buff
*skb
;
1912 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1913 fc
= hdr
->frame_control
;
1915 if (ieee80211_is_ctl(fc
))
1918 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1919 frag
= sc
& IEEE80211_SCTL_FRAG
;
1921 if (is_multicast_ether_addr(hdr
->addr1
)) {
1922 I802_DEBUG_INC(rx
->local
->dot11MulticastReceivedFrameCount
);
1926 if (likely(!ieee80211_has_morefrags(fc
) && frag
== 0))
1929 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1931 if (skb_linearize(rx
->skb
))
1932 return RX_DROP_UNUSABLE
;
1935 * skb_linearize() might change the skb->data and
1936 * previously cached variables (in this case, hdr) need to
1937 * be refreshed with the new data.
1939 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1940 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1943 /* This is the first fragment of a new frame. */
1944 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1945 rx
->seqno_idx
, &(rx
->skb
));
1947 (rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
||
1948 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP_256
||
1949 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_GCMP
||
1950 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_GCMP_256
) &&
1951 ieee80211_has_protected(fc
)) {
1952 int queue
= rx
->security_idx
;
1954 /* Store CCMP/GCMP PN so that we can verify that the
1955 * next fragment has a sequential PN value.
1957 entry
->check_sequential_pn
= true;
1958 memcpy(entry
->last_pn
,
1959 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1960 IEEE80211_CCMP_PN_LEN
);
1961 BUILD_BUG_ON(offsetof(struct ieee80211_key
,
1963 offsetof(struct ieee80211_key
,
1965 BUILD_BUG_ON(sizeof(rx
->key
->u
.ccmp
.rx_pn
[queue
]) !=
1966 sizeof(rx
->key
->u
.gcmp
.rx_pn
[queue
]));
1967 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN
!=
1968 IEEE80211_GCMP_PN_LEN
);
1973 /* This is a fragment for a frame that should already be pending in
1974 * fragment cache. Add this fragment to the end of the pending entry.
1976 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1977 rx
->seqno_idx
, hdr
);
1979 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1980 return RX_DROP_MONITOR
;
1983 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1984 * MPDU PN values are not incrementing in steps of 1."
1985 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1986 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1988 if (entry
->check_sequential_pn
) {
1990 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1994 (rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
&&
1995 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP_256
&&
1996 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_GCMP
&&
1997 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_GCMP_256
))
1998 return RX_DROP_UNUSABLE
;
1999 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
2000 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
2005 queue
= rx
->security_idx
;
2006 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
2007 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
2008 return RX_DROP_UNUSABLE
;
2009 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
2012 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
2013 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
2014 entry
->last_frag
= frag
;
2015 entry
->extra_len
+= rx
->skb
->len
;
2016 if (ieee80211_has_morefrags(fc
)) {
2021 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
2022 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
2023 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head_defrag
);
2024 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
2026 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
2027 __skb_queue_purge(&entry
->skb_list
);
2028 return RX_DROP_UNUSABLE
;
2031 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
2032 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
2037 ieee80211_led_rx(rx
->local
);
2040 rx
->sta
->rx_stats
.packets
++;
2044 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
2046 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
2052 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
2054 struct sk_buff
*skb
= rx
->skb
;
2055 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2058 * Pass through unencrypted frames if the hardware has
2059 * decrypted them already.
2061 if (status
->flag
& RX_FLAG_DECRYPTED
)
2064 /* Drop unencrypted frames if key is set. */
2065 if (unlikely(!ieee80211_has_protected(fc
) &&
2066 !ieee80211_is_nullfunc(fc
) &&
2067 ieee80211_is_data(fc
) && rx
->key
))
2073 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
2075 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2076 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2077 __le16 fc
= hdr
->frame_control
;
2080 * Pass through unencrypted frames if the hardware has
2081 * decrypted them already.
2083 if (status
->flag
& RX_FLAG_DECRYPTED
)
2086 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
2087 if (unlikely(!ieee80211_has_protected(fc
) &&
2088 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
2090 if (ieee80211_is_deauth(fc
) ||
2091 ieee80211_is_disassoc(fc
))
2092 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
2097 /* BIP does not use Protected field, so need to check MMIE */
2098 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
2099 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
2100 if (ieee80211_is_deauth(fc
) ||
2101 ieee80211_is_disassoc(fc
))
2102 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
2108 * When using MFP, Action frames are not allowed prior to
2109 * having configured keys.
2111 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
2112 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
2120 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
2122 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2123 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2124 bool check_port_control
= false;
2125 struct ethhdr
*ehdr
;
2128 *port_control
= false;
2129 if (ieee80211_has_a4(hdr
->frame_control
) &&
2130 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
2133 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2134 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
2136 if (!sdata
->u
.mgd
.use_4addr
)
2139 check_port_control
= true;
2142 if (is_multicast_ether_addr(hdr
->addr1
) &&
2143 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
2146 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
2150 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2151 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
2152 *port_control
= true;
2153 else if (check_port_control
)
2160 * requires that rx->skb is a frame with ethernet header
2162 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
2164 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
2165 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2166 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2169 * Allow EAPOL frames to us/the PAE group address regardless
2170 * of whether the frame was encrypted or not.
2172 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
2173 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
2174 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
2177 if (ieee80211_802_1x_port_control(rx
) ||
2178 ieee80211_drop_unencrypted(rx
, fc
))
2185 * requires that rx->skb is a frame with ethernet header
2188 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
2190 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2191 struct net_device
*dev
= sdata
->dev
;
2192 struct sk_buff
*skb
, *xmit_skb
;
2193 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
2194 struct sta_info
*dsta
;
2199 ieee80211_rx_stats(dev
, skb
->len
);
2202 /* The seqno index has the same property as needed
2203 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2204 * for non-QoS-data frames. Here we know it's a data
2205 * frame, so count MSDUs.
2207 u64_stats_update_begin(&rx
->sta
->rx_stats
.syncp
);
2208 rx
->sta
->rx_stats
.msdu
[rx
->seqno_idx
]++;
2209 u64_stats_update_end(&rx
->sta
->rx_stats
.syncp
);
2212 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2213 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
2214 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
2215 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
2216 if (is_multicast_ether_addr(ehdr
->h_dest
) &&
2217 ieee80211_vif_get_num_mcast_if(sdata
) != 0) {
2219 * send multicast frames both to higher layers in
2220 * local net stack and back to the wireless medium
2222 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
2224 net_info_ratelimited("%s: failed to clone multicast frame\n",
2226 } else if (!is_multicast_ether_addr(ehdr
->h_dest
)) {
2227 dsta
= sta_info_get(sdata
, skb
->data
);
2230 * The destination station is associated to
2231 * this AP (in this VLAN), so send the frame
2232 * directly to it and do not pass it to local
2241 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2243 /* 'align' will only take the values 0 or 2 here since all
2244 * frames are required to be aligned to 2-byte boundaries
2245 * when being passed to mac80211; the code here works just
2246 * as well if that isn't true, but mac80211 assumes it can
2247 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2251 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
2253 if (WARN_ON(skb_headroom(skb
) < 3)) {
2257 u8
*data
= skb
->data
;
2258 size_t len
= skb_headlen(skb
);
2260 memmove(skb
->data
, data
, len
);
2261 skb_set_tail_pointer(skb
, len
);
2268 /* deliver to local stack */
2269 skb
->protocol
= eth_type_trans(skb
, dev
);
2270 memset(skb
->cb
, 0, sizeof(skb
->cb
));
2272 napi_gro_receive(rx
->napi
, skb
);
2274 netif_receive_skb(skb
);
2279 * Send to wireless media and increase priority by 256 to
2280 * keep the received priority instead of reclassifying
2281 * the frame (see cfg80211_classify8021d).
2283 xmit_skb
->priority
+= 256;
2284 xmit_skb
->protocol
= htons(ETH_P_802_3
);
2285 skb_reset_network_header(xmit_skb
);
2286 skb_reset_mac_header(xmit_skb
);
2287 dev_queue_xmit(xmit_skb
);
2291 static ieee80211_rx_result debug_noinline
2292 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
2294 struct net_device
*dev
= rx
->sdata
->dev
;
2295 struct sk_buff
*skb
= rx
->skb
;
2296 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2297 __le16 fc
= hdr
->frame_control
;
2298 struct sk_buff_head frame_list
;
2299 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2300 struct ethhdr ethhdr
;
2301 const u8
*check_da
= ethhdr
.h_dest
, *check_sa
= ethhdr
.h_source
;
2303 if (unlikely(!ieee80211_is_data(fc
)))
2306 if (unlikely(!ieee80211_is_data_present(fc
)))
2307 return RX_DROP_MONITOR
;
2309 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2312 if (unlikely(ieee80211_has_a4(hdr
->frame_control
))) {
2313 switch (rx
->sdata
->vif
.type
) {
2314 case NL80211_IFTYPE_AP_VLAN
:
2315 if (!rx
->sdata
->u
.vlan
.sta
)
2316 return RX_DROP_UNUSABLE
;
2318 case NL80211_IFTYPE_STATION
:
2319 if (!rx
->sdata
->u
.mgd
.use_4addr
)
2320 return RX_DROP_UNUSABLE
;
2323 return RX_DROP_UNUSABLE
;
2327 } else switch (rx
->sdata
->vif
.type
) {
2328 case NL80211_IFTYPE_AP
:
2329 case NL80211_IFTYPE_AP_VLAN
:
2332 case NL80211_IFTYPE_STATION
:
2334 !test_sta_flag(rx
->sta
, WLAN_STA_TDLS_PEER
))
2337 case NL80211_IFTYPE_MESH_POINT
:
2344 if (is_multicast_ether_addr(hdr
->addr1
))
2345 return RX_DROP_UNUSABLE
;
2348 __skb_queue_head_init(&frame_list
);
2350 if (ieee80211_data_to_8023_exthdr(skb
, ðhdr
,
2351 rx
->sdata
->vif
.addr
,
2352 rx
->sdata
->vif
.type
))
2353 return RX_DROP_UNUSABLE
;
2355 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2356 rx
->sdata
->vif
.type
,
2357 rx
->local
->hw
.extra_tx_headroom
,
2358 check_da
, check_sa
);
2360 while (!skb_queue_empty(&frame_list
)) {
2361 rx
->skb
= __skb_dequeue(&frame_list
);
2363 if (!ieee80211_frame_allowed(rx
, fc
)) {
2364 dev_kfree_skb(rx
->skb
);
2368 ieee80211_deliver_skb(rx
);
2374 #ifdef CONFIG_MAC80211_MESH
2375 static ieee80211_rx_result
2376 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2378 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2379 struct ieee80211_tx_info
*info
;
2380 struct ieee80211s_hdr
*mesh_hdr
;
2381 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2382 struct ieee80211_local
*local
= rx
->local
;
2383 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2384 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2387 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2388 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2390 /* make sure fixed part of mesh header is there, also checks skb len */
2391 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2392 return RX_DROP_MONITOR
;
2394 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2396 /* make sure full mesh header is there, also checks skb len */
2397 if (!pskb_may_pull(rx
->skb
,
2398 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2399 return RX_DROP_MONITOR
;
2401 /* reload pointers */
2402 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2403 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2405 if (ieee80211_drop_unencrypted(rx
, hdr
->frame_control
))
2406 return RX_DROP_MONITOR
;
2408 /* frame is in RMC, don't forward */
2409 if (ieee80211_is_data(hdr
->frame_control
) &&
2410 is_multicast_ether_addr(hdr
->addr1
) &&
2411 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2412 return RX_DROP_MONITOR
;
2414 if (!ieee80211_is_data(hdr
->frame_control
))
2418 return RX_DROP_MONITOR
;
2420 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2421 struct mesh_path
*mppath
;
2425 if (is_multicast_ether_addr(hdr
->addr1
)) {
2426 mpp_addr
= hdr
->addr3
;
2427 proxied_addr
= mesh_hdr
->eaddr1
;
2428 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2429 /* has_a4 already checked in ieee80211_rx_mesh_check */
2430 mpp_addr
= hdr
->addr4
;
2431 proxied_addr
= mesh_hdr
->eaddr2
;
2433 return RX_DROP_MONITOR
;
2437 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2439 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2441 spin_lock_bh(&mppath
->state_lock
);
2442 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2443 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2444 mppath
->exp_time
= jiffies
;
2445 spin_unlock_bh(&mppath
->state_lock
);
2450 /* Frame has reached destination. Don't forward */
2451 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2452 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2455 ac
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2456 q
= sdata
->vif
.hw_queue
[ac
];
2457 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2458 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2459 return RX_DROP_MONITOR
;
2461 skb_set_queue_mapping(skb
, q
);
2463 if (!--mesh_hdr
->ttl
) {
2464 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2468 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2471 fwd_skb
= skb_copy_expand(skb
, local
->tx_headroom
+
2472 sdata
->encrypt_headroom
, 0, GFP_ATOMIC
);
2474 net_info_ratelimited("%s: failed to clone mesh frame\n",
2479 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2480 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2481 info
= IEEE80211_SKB_CB(fwd_skb
);
2482 memset(info
, 0, sizeof(*info
));
2483 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2484 info
->control
.vif
= &rx
->sdata
->vif
;
2485 info
->control
.jiffies
= jiffies
;
2486 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2487 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2488 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2489 /* update power mode indication when forwarding */
2490 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2491 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2492 /* mesh power mode flags updated in mesh_nexthop_lookup */
2493 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2495 /* unable to resolve next hop */
2496 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2498 WLAN_REASON_MESH_PATH_NOFORWARD
,
2500 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2502 return RX_DROP_MONITOR
;
2505 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2506 ieee80211_add_pending_skb(local
, fwd_skb
);
2508 if (is_multicast_ether_addr(hdr
->addr1
))
2510 return RX_DROP_MONITOR
;
2514 static ieee80211_rx_result debug_noinline
2515 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2517 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2518 struct ieee80211_local
*local
= rx
->local
;
2519 struct net_device
*dev
= sdata
->dev
;
2520 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2521 __le16 fc
= hdr
->frame_control
;
2525 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2528 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2529 return RX_DROP_MONITOR
;
2532 * Send unexpected-4addr-frame event to hostapd. For older versions,
2533 * also drop the frame to cooked monitor interfaces.
2535 if (ieee80211_has_a4(hdr
->frame_control
) &&
2536 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2538 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2539 cfg80211_rx_unexpected_4addr_frame(
2540 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2541 return RX_DROP_MONITOR
;
2544 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2546 return RX_DROP_UNUSABLE
;
2548 if (!ieee80211_frame_allowed(rx
, fc
))
2549 return RX_DROP_MONITOR
;
2551 /* directly handle TDLS channel switch requests/responses */
2552 if (unlikely(((struct ethhdr
*)rx
->skb
->data
)->h_proto
==
2553 cpu_to_be16(ETH_P_TDLS
))) {
2554 struct ieee80211_tdls_data
*tf
= (void *)rx
->skb
->data
;
2556 if (pskb_may_pull(rx
->skb
,
2557 offsetof(struct ieee80211_tdls_data
, u
)) &&
2558 tf
->payload_type
== WLAN_TDLS_SNAP_RFTYPE
&&
2559 tf
->category
== WLAN_CATEGORY_TDLS
&&
2560 (tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_REQUEST
||
2561 tf
->action_code
== WLAN_TDLS_CHANNEL_SWITCH_RESPONSE
)) {
2562 skb_queue_tail(&local
->skb_queue_tdls_chsw
, rx
->skb
);
2563 schedule_work(&local
->tdls_chsw_work
);
2565 rx
->sta
->rx_stats
.packets
++;
2571 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2572 unlikely(port_control
) && sdata
->bss
) {
2573 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2581 if (!ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
) &&
2582 local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2583 !is_multicast_ether_addr(
2584 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2585 (!local
->scanning
&&
2586 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
)))
2587 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2588 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2590 ieee80211_deliver_skb(rx
);
2595 static ieee80211_rx_result debug_noinline
2596 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2598 struct sk_buff
*skb
= rx
->skb
;
2599 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2600 struct tid_ampdu_rx
*tid_agg_rx
;
2604 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2607 if (ieee80211_is_back_req(bar
->frame_control
)) {
2609 __le16 control
, start_seq_num
;
2610 } __packed bar_data
;
2611 struct ieee80211_event event
= {
2612 .type
= BAR_RX_EVENT
,
2616 return RX_DROP_MONITOR
;
2618 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2619 &bar_data
, sizeof(bar_data
)))
2620 return RX_DROP_MONITOR
;
2622 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2624 if (!test_bit(tid
, rx
->sta
->ampdu_mlme
.agg_session_valid
) &&
2625 !test_and_set_bit(tid
, rx
->sta
->ampdu_mlme
.unexpected_agg
))
2626 ieee80211_send_delba(rx
->sdata
, rx
->sta
->sta
.addr
, tid
,
2627 WLAN_BACK_RECIPIENT
,
2628 WLAN_REASON_QSTA_REQUIRE_SETUP
);
2630 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2632 return RX_DROP_MONITOR
;
2634 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2635 event
.u
.ba
.tid
= tid
;
2636 event
.u
.ba
.ssn
= start_seq_num
;
2637 event
.u
.ba
.sta
= &rx
->sta
->sta
;
2639 /* reset session timer */
2640 if (tid_agg_rx
->timeout
)
2641 mod_timer(&tid_agg_rx
->session_timer
,
2642 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2644 spin_lock(&tid_agg_rx
->reorder_lock
);
2645 /* release stored frames up to start of BAR */
2646 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2647 start_seq_num
, frames
);
2648 spin_unlock(&tid_agg_rx
->reorder_lock
);
2650 drv_event_callback(rx
->local
, rx
->sdata
, &event
);
2657 * After this point, we only want management frames,
2658 * so we can drop all remaining control frames to
2659 * cooked monitor interfaces.
2661 return RX_DROP_MONITOR
;
2664 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2665 struct ieee80211_mgmt
*mgmt
,
2668 struct ieee80211_local
*local
= sdata
->local
;
2669 struct sk_buff
*skb
;
2670 struct ieee80211_mgmt
*resp
;
2672 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2673 /* Not to own unicast address */
2677 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2678 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2679 /* Not from the current AP or not associated yet. */
2683 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2684 /* Too short SA Query request frame */
2688 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2692 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2693 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2694 memset(resp
, 0, 24);
2695 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2696 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2697 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2698 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2699 IEEE80211_STYPE_ACTION
);
2700 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2701 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2702 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2703 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2704 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2705 WLAN_SA_QUERY_TR_ID_LEN
);
2707 ieee80211_tx_skb(sdata
, skb
);
2710 static ieee80211_rx_result debug_noinline
2711 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2713 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2714 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2717 * From here on, look only at management frames.
2718 * Data and control frames are already handled,
2719 * and unknown (reserved) frames are useless.
2721 if (rx
->skb
->len
< 24)
2722 return RX_DROP_MONITOR
;
2724 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2725 return RX_DROP_MONITOR
;
2727 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2728 ieee80211_is_beacon(mgmt
->frame_control
) &&
2729 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2732 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
2733 sig
= status
->signal
;
2735 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2736 rx
->skb
->data
, rx
->skb
->len
,
2738 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2741 if (ieee80211_drop_unencrypted_mgmt(rx
))
2742 return RX_DROP_UNUSABLE
;
2747 static ieee80211_rx_result debug_noinline
2748 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2750 struct ieee80211_local
*local
= rx
->local
;
2751 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2752 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2753 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2754 int len
= rx
->skb
->len
;
2756 if (!ieee80211_is_action(mgmt
->frame_control
))
2759 /* drop too small frames */
2760 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2761 return RX_DROP_UNUSABLE
;
2763 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2764 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2765 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2766 return RX_DROP_UNUSABLE
;
2768 switch (mgmt
->u
.action
.category
) {
2769 case WLAN_CATEGORY_HT
:
2770 /* reject HT action frames from stations not supporting HT */
2771 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2774 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2775 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2776 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2777 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2778 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2781 /* verify action & smps_control/chanwidth are present */
2782 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2785 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2786 case WLAN_HT_ACTION_SMPS
: {
2787 struct ieee80211_supported_band
*sband
;
2788 enum ieee80211_smps_mode smps_mode
;
2790 /* convert to HT capability */
2791 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2792 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2793 smps_mode
= IEEE80211_SMPS_OFF
;
2795 case WLAN_HT_SMPS_CONTROL_STATIC
:
2796 smps_mode
= IEEE80211_SMPS_STATIC
;
2798 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2799 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2805 /* if no change do nothing */
2806 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2808 rx
->sta
->sta
.smps_mode
= smps_mode
;
2810 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2812 rate_control_rate_update(local
, sband
, rx
->sta
,
2813 IEEE80211_RC_SMPS_CHANGED
);
2816 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2817 struct ieee80211_supported_band
*sband
;
2818 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2819 enum ieee80211_sta_rx_bandwidth max_bw
, new_bw
;
2821 /* If it doesn't support 40 MHz it can't change ... */
2822 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2823 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2826 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2827 max_bw
= IEEE80211_STA_RX_BW_20
;
2829 max_bw
= ieee80211_sta_cap_rx_bw(rx
->sta
);
2831 /* set cur_max_bandwidth and recalc sta bw */
2832 rx
->sta
->cur_max_bandwidth
= max_bw
;
2833 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2835 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2838 rx
->sta
->sta
.bandwidth
= new_bw
;
2839 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2841 rate_control_rate_update(local
, sband
, rx
->sta
,
2842 IEEE80211_RC_BW_CHANGED
);
2850 case WLAN_CATEGORY_PUBLIC
:
2851 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2853 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2857 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2859 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2860 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2862 if (len
< offsetof(struct ieee80211_mgmt
,
2863 u
.action
.u
.ext_chan_switch
.variable
))
2866 case WLAN_CATEGORY_VHT
:
2867 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2868 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2869 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2870 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2871 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2874 /* verify action code is present */
2875 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2878 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2879 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2880 /* verify opmode is present */
2881 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2885 case WLAN_VHT_ACTION_GROUPID_MGMT
: {
2886 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 25)
2894 case WLAN_CATEGORY_BACK
:
2895 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2896 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2897 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2898 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2899 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2902 /* verify action_code is present */
2903 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2906 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2907 case WLAN_ACTION_ADDBA_REQ
:
2908 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2909 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2912 case WLAN_ACTION_ADDBA_RESP
:
2913 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2914 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2917 case WLAN_ACTION_DELBA
:
2918 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2919 sizeof(mgmt
->u
.action
.u
.delba
)))
2927 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2928 /* verify action_code is present */
2929 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2932 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2933 case WLAN_ACTION_SPCT_MSR_REQ
:
2934 if (status
->band
!= NL80211_BAND_5GHZ
)
2937 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2938 sizeof(mgmt
->u
.action
.u
.measurement
)))
2941 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2944 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2946 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2948 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2949 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2952 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2953 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2954 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2957 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2958 bssid
= sdata
->u
.mgd
.bssid
;
2959 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2960 bssid
= sdata
->u
.ibss
.bssid
;
2961 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2966 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2973 case WLAN_CATEGORY_SA_QUERY
:
2974 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2975 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2978 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2979 case WLAN_ACTION_SA_QUERY_REQUEST
:
2980 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2982 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2986 case WLAN_CATEGORY_SELF_PROTECTED
:
2987 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2988 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2991 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2992 case WLAN_SP_MESH_PEERING_OPEN
:
2993 case WLAN_SP_MESH_PEERING_CLOSE
:
2994 case WLAN_SP_MESH_PEERING_CONFIRM
:
2995 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2997 if (sdata
->u
.mesh
.user_mpm
)
2998 /* userspace handles this frame */
3001 case WLAN_SP_MGK_INFORM
:
3002 case WLAN_SP_MGK_ACK
:
3003 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
3008 case WLAN_CATEGORY_MESH_ACTION
:
3009 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
3010 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
3013 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
3015 if (mesh_action_is_path_sel(mgmt
) &&
3016 !mesh_path_sel_is_hwmp(sdata
))
3024 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
3025 /* will return in the next handlers */
3030 rx
->sta
->rx_stats
.packets
++;
3031 dev_kfree_skb(rx
->skb
);
3035 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
3036 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
3037 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
3039 rx
->sta
->rx_stats
.packets
++;
3043 static ieee80211_rx_result debug_noinline
3044 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
3046 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
3049 /* skip known-bad action frames and return them in the next handler */
3050 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
3054 * Getting here means the kernel doesn't know how to handle
3055 * it, but maybe userspace does ... include returned frames
3056 * so userspace can register for those to know whether ones
3057 * it transmitted were processed or returned.
3060 if (ieee80211_hw_check(&rx
->local
->hw
, SIGNAL_DBM
))
3061 sig
= status
->signal
;
3063 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
3064 rx
->skb
->data
, rx
->skb
->len
, 0)) {
3066 rx
->sta
->rx_stats
.packets
++;
3067 dev_kfree_skb(rx
->skb
);
3074 static ieee80211_rx_result debug_noinline
3075 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
3077 struct ieee80211_local
*local
= rx
->local
;
3078 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
3079 struct sk_buff
*nskb
;
3080 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3081 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
3083 if (!ieee80211_is_action(mgmt
->frame_control
))
3087 * For AP mode, hostapd is responsible for handling any action
3088 * frames that we didn't handle, including returning unknown
3089 * ones. For all other modes we will return them to the sender,
3090 * setting the 0x80 bit in the action category, as required by
3091 * 802.11-2012 9.24.4.
3092 * Newer versions of hostapd shall also use the management frame
3093 * registration mechanisms, but older ones still use cooked
3094 * monitor interfaces so push all frames there.
3096 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
3097 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
3098 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
3099 return RX_DROP_MONITOR
;
3101 if (is_multicast_ether_addr(mgmt
->da
))
3102 return RX_DROP_MONITOR
;
3104 /* do not return rejected action frames */
3105 if (mgmt
->u
.action
.category
& 0x80)
3106 return RX_DROP_UNUSABLE
;
3108 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
3111 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
3113 nmgmt
->u
.action
.category
|= 0x80;
3114 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
3115 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
3117 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
3119 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
3120 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
3122 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
3123 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
3124 IEEE80211_TX_CTL_NO_CCK_RATE
;
3125 if (ieee80211_hw_check(&local
->hw
, QUEUE_CONTROL
))
3127 local
->hw
.offchannel_tx_hw_queue
;
3130 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
3133 dev_kfree_skb(rx
->skb
);
3137 static ieee80211_rx_result debug_noinline
3138 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
3140 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3141 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
3144 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
3146 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
3147 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
3148 sdata
->vif
.type
!= NL80211_IFTYPE_OCB
&&
3149 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
3150 return RX_DROP_MONITOR
;
3153 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
3154 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
3155 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
3156 /* process for all: mesh, mlme, ibss */
3158 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
3159 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
3160 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
3161 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
3162 if (is_multicast_ether_addr(mgmt
->da
) &&
3163 !is_broadcast_ether_addr(mgmt
->da
))
3164 return RX_DROP_MONITOR
;
3166 /* process only for station */
3167 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
3168 return RX_DROP_MONITOR
;
3170 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
3171 /* process only for ibss and mesh */
3172 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
3173 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
3174 return RX_DROP_MONITOR
;
3177 return RX_DROP_MONITOR
;
3180 /* queue up frame and kick off work to process it */
3181 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
3182 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
3183 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
3185 rx
->sta
->rx_stats
.packets
++;
3190 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
3191 struct ieee80211_rate
*rate
)
3193 struct ieee80211_sub_if_data
*sdata
;
3194 struct ieee80211_local
*local
= rx
->local
;
3195 struct sk_buff
*skb
= rx
->skb
, *skb2
;
3196 struct net_device
*prev_dev
= NULL
;
3197 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3198 int needed_headroom
;
3201 * If cooked monitor has been processed already, then
3202 * don't do it again. If not, set the flag.
3204 if (rx
->flags
& IEEE80211_RX_CMNTR
)
3206 rx
->flags
|= IEEE80211_RX_CMNTR
;
3208 /* If there are no cooked monitor interfaces, just free the SKB */
3209 if (!local
->cooked_mntrs
)
3212 /* vendor data is long removed here */
3213 status
->flag
&= ~RX_FLAG_RADIOTAP_VENDOR_DATA
;
3214 /* room for the radiotap header based on driver features */
3215 needed_headroom
= ieee80211_rx_radiotap_hdrlen(local
, status
, skb
);
3217 if (skb_headroom(skb
) < needed_headroom
&&
3218 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
3221 /* prepend radiotap information */
3222 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
3225 skb_reset_mac_header(skb
);
3226 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
3227 skb
->pkt_type
= PACKET_OTHERHOST
;
3228 skb
->protocol
= htons(ETH_P_802_2
);
3230 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3231 if (!ieee80211_sdata_running(sdata
))
3234 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
3235 !(sdata
->u
.mntr
.flags
& MONITOR_FLAG_COOK_FRAMES
))
3239 skb2
= skb_clone(skb
, GFP_ATOMIC
);
3241 skb2
->dev
= prev_dev
;
3242 netif_receive_skb(skb2
);
3246 prev_dev
= sdata
->dev
;
3247 ieee80211_rx_stats(sdata
->dev
, skb
->len
);
3251 skb
->dev
= prev_dev
;
3252 netif_receive_skb(skb
);
3260 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
3261 ieee80211_rx_result res
)
3264 case RX_DROP_MONITOR
:
3265 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3267 rx
->sta
->rx_stats
.dropped
++;
3270 struct ieee80211_rate
*rate
= NULL
;
3271 struct ieee80211_supported_band
*sband
;
3272 struct ieee80211_rx_status
*status
;
3274 status
= IEEE80211_SKB_RXCB((rx
->skb
));
3276 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
3277 if (!(status
->flag
& RX_FLAG_HT
) &&
3278 !(status
->flag
& RX_FLAG_VHT
))
3279 rate
= &sband
->bitrates
[status
->rate_idx
];
3281 ieee80211_rx_cooked_monitor(rx
, rate
);
3284 case RX_DROP_UNUSABLE
:
3285 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
3287 rx
->sta
->rx_stats
.dropped
++;
3288 dev_kfree_skb(rx
->skb
);
3291 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
3296 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
3297 struct sk_buff_head
*frames
)
3299 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3300 struct sk_buff
*skb
;
3302 #define CALL_RXH(rxh) \
3305 if (res != RX_CONTINUE) \
3309 /* Lock here to avoid hitting all of the data used in the RX
3310 * path (e.g. key data, station data, ...) concurrently when
3311 * a frame is released from the reorder buffer due to timeout
3312 * from the timer, potentially concurrently with RX from the
3315 spin_lock_bh(&rx
->local
->rx_path_lock
);
3317 while ((skb
= __skb_dequeue(frames
))) {
3319 * all the other fields are valid across frames
3320 * that belong to an aMPDU since they are on the
3321 * same TID from the same station
3325 CALL_RXH(ieee80211_rx_h_check_more_data
);
3326 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
);
3327 CALL_RXH(ieee80211_rx_h_sta_process
);
3328 CALL_RXH(ieee80211_rx_h_decrypt
);
3329 CALL_RXH(ieee80211_rx_h_defragment
);
3330 CALL_RXH(ieee80211_rx_h_michael_mic_verify
);
3331 /* must be after MMIC verify so header is counted in MPDU mic */
3332 #ifdef CONFIG_MAC80211_MESH
3333 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
3334 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
3336 CALL_RXH(ieee80211_rx_h_amsdu
);
3337 CALL_RXH(ieee80211_rx_h_data
);
3339 /* special treatment -- needs the queue */
3340 res
= ieee80211_rx_h_ctrl(rx
, frames
);
3341 if (res
!= RX_CONTINUE
)
3344 CALL_RXH(ieee80211_rx_h_mgmt_check
);
3345 CALL_RXH(ieee80211_rx_h_action
);
3346 CALL_RXH(ieee80211_rx_h_userspace_mgmt
);
3347 CALL_RXH(ieee80211_rx_h_action_return
);
3348 CALL_RXH(ieee80211_rx_h_mgmt
);
3351 ieee80211_rx_handlers_result(rx
, res
);
3356 spin_unlock_bh(&rx
->local
->rx_path_lock
);
3359 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
3361 struct sk_buff_head reorder_release
;
3362 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3364 __skb_queue_head_init(&reorder_release
);
3366 #define CALL_RXH(rxh) \
3369 if (res != RX_CONTINUE) \
3373 CALL_RXH(ieee80211_rx_h_check_dup
);
3374 CALL_RXH(ieee80211_rx_h_check
);
3376 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3378 ieee80211_rx_handlers(rx
, &reorder_release
);
3382 ieee80211_rx_handlers_result(rx
, res
);
3388 * This function makes calls into the RX path, therefore
3389 * it has to be invoked under RCU read lock.
3391 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3393 struct sk_buff_head frames
;
3394 struct ieee80211_rx_data rx
= {
3396 .sdata
= sta
->sdata
,
3397 .local
= sta
->local
,
3398 /* This is OK -- must be QoS data frame */
3399 .security_idx
= tid
,
3401 .napi
= NULL
, /* must be NULL to not have races */
3403 struct tid_ampdu_rx
*tid_agg_rx
;
3405 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3409 __skb_queue_head_init(&frames
);
3411 spin_lock(&tid_agg_rx
->reorder_lock
);
3412 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3413 spin_unlock(&tid_agg_rx
->reorder_lock
);
3415 if (!skb_queue_empty(&frames
)) {
3416 struct ieee80211_event event
= {
3417 .type
= BA_FRAME_TIMEOUT
,
3419 .u
.ba
.sta
= &sta
->sta
,
3421 drv_event_callback(rx
.local
, rx
.sdata
, &event
);
3424 ieee80211_rx_handlers(&rx
, &frames
);
3427 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta
*pubsta
, u8 tid
,
3428 u16 ssn
, u64 filtered
,
3431 struct sta_info
*sta
;
3432 struct tid_ampdu_rx
*tid_agg_rx
;
3433 struct sk_buff_head frames
;
3434 struct ieee80211_rx_data rx
= {
3435 /* This is OK -- must be QoS data frame */
3436 .security_idx
= tid
,
3441 if (WARN_ON(!pubsta
|| tid
>= IEEE80211_NUM_TIDS
))
3444 __skb_queue_head_init(&frames
);
3446 sta
= container_of(pubsta
, struct sta_info
, sta
);
3449 rx
.sdata
= sta
->sdata
;
3450 rx
.local
= sta
->local
;
3453 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3457 spin_lock_bh(&tid_agg_rx
->reorder_lock
);
3459 if (received_mpdus
>= IEEE80211_SN_MODULO
>> 1) {
3462 /* release all frames in the reorder buffer */
3463 release
= (tid_agg_rx
->head_seq_num
+ tid_agg_rx
->buf_size
) %
3464 IEEE80211_SN_MODULO
;
3465 ieee80211_release_reorder_frames(sta
->sdata
, tid_agg_rx
,
3467 /* update ssn to match received ssn */
3468 tid_agg_rx
->head_seq_num
= ssn
;
3470 ieee80211_release_reorder_frames(sta
->sdata
, tid_agg_rx
, ssn
,
3474 /* handle the case that received ssn is behind the mac ssn.
3475 * it can be tid_agg_rx->buf_size behind and still be valid */
3476 diff
= (tid_agg_rx
->head_seq_num
- ssn
) & IEEE80211_SN_MASK
;
3477 if (diff
>= tid_agg_rx
->buf_size
) {
3478 tid_agg_rx
->reorder_buf_filtered
= 0;
3481 filtered
= filtered
>> diff
;
3485 for (i
= 0; i
< tid_agg_rx
->buf_size
; i
++) {
3486 int index
= (ssn
+ i
) % tid_agg_rx
->buf_size
;
3488 tid_agg_rx
->reorder_buf_filtered
&= ~BIT_ULL(index
);
3489 if (filtered
& BIT_ULL(i
))
3490 tid_agg_rx
->reorder_buf_filtered
|= BIT_ULL(index
);
3493 /* now process also frames that the filter marking released */
3494 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3497 spin_unlock_bh(&tid_agg_rx
->reorder_lock
);
3499 ieee80211_rx_handlers(&rx
, &frames
);
3504 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames
);
3506 /* main receive path */
3508 static bool ieee80211_accept_frame(struct ieee80211_rx_data
*rx
)
3510 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3511 struct sk_buff
*skb
= rx
->skb
;
3512 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3513 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3514 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3515 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3517 switch (sdata
->vif
.type
) {
3518 case NL80211_IFTYPE_STATION
:
3519 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3523 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3524 case NL80211_IFTYPE_ADHOC
:
3527 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3528 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3530 if (ieee80211_is_beacon(hdr
->frame_control
))
3532 if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
))
3535 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3539 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3540 rate_idx
= 0; /* TODO: HT/VHT rates */
3542 rate_idx
= status
->rate_idx
;
3543 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3547 case NL80211_IFTYPE_OCB
:
3550 if (!ieee80211_is_data_present(hdr
->frame_control
))
3552 if (!is_broadcast_ether_addr(bssid
))
3555 !ether_addr_equal(sdata
->dev
->dev_addr
, hdr
->addr1
))
3559 if (status
->flag
& RX_FLAG_HT
)
3560 rate_idx
= 0; /* TODO: HT rates */
3562 rate_idx
= status
->rate_idx
;
3563 ieee80211_ocb_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3567 case NL80211_IFTYPE_MESH_POINT
:
3570 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3571 case NL80211_IFTYPE_AP_VLAN
:
3572 case NL80211_IFTYPE_AP
:
3574 return ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
);
3576 if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3578 * Accept public action frames even when the
3579 * BSSID doesn't match, this is used for P2P
3580 * and location updates. Note that mac80211
3581 * itself never looks at these frames.
3584 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3586 if (ieee80211_is_public_action(hdr
, skb
->len
))
3588 return ieee80211_is_beacon(hdr
->frame_control
);
3591 if (!ieee80211_has_tods(hdr
->frame_control
)) {
3592 /* ignore data frames to TDLS-peers */
3593 if (ieee80211_is_data(hdr
->frame_control
))
3595 /* ignore action frames to TDLS-peers */
3596 if (ieee80211_is_action(hdr
->frame_control
) &&
3597 !is_broadcast_ether_addr(bssid
) &&
3598 !ether_addr_equal(bssid
, hdr
->addr1
))
3602 case NL80211_IFTYPE_WDS
:
3603 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3605 return ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
);
3606 case NL80211_IFTYPE_P2P_DEVICE
:
3607 return ieee80211_is_public_action(hdr
, skb
->len
) ||
3608 ieee80211_is_probe_req(hdr
->frame_control
) ||
3609 ieee80211_is_probe_resp(hdr
->frame_control
) ||
3610 ieee80211_is_beacon(hdr
->frame_control
);
3611 case NL80211_IFTYPE_NAN
:
3612 /* Currently no frames on NAN interface are allowed */
3622 void ieee80211_check_fast_rx(struct sta_info
*sta
)
3624 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
3625 struct ieee80211_local
*local
= sdata
->local
;
3626 struct ieee80211_key
*key
;
3627 struct ieee80211_fast_rx fastrx
= {
3629 .vif_type
= sdata
->vif
.type
,
3630 .control_port_protocol
= sdata
->control_port_protocol
,
3631 }, *old
, *new = NULL
;
3632 bool assign
= false;
3634 /* use sparse to check that we don't return without updating */
3635 __acquire(check_fast_rx
);
3637 BUILD_BUG_ON(sizeof(fastrx
.rfc1042_hdr
) != sizeof(rfc1042_header
));
3638 BUILD_BUG_ON(sizeof(fastrx
.rfc1042_hdr
) != ETH_ALEN
);
3639 ether_addr_copy(fastrx
.rfc1042_hdr
, rfc1042_header
);
3640 ether_addr_copy(fastrx
.vif_addr
, sdata
->vif
.addr
);
3642 fastrx
.uses_rss
= ieee80211_hw_check(&local
->hw
, USES_RSS
);
3644 /* fast-rx doesn't do reordering */
3645 if (ieee80211_hw_check(&local
->hw
, AMPDU_AGGREGATION
) &&
3646 !ieee80211_hw_check(&local
->hw
, SUPPORTS_REORDERING_BUFFER
))
3649 switch (sdata
->vif
.type
) {
3650 case NL80211_IFTYPE_STATION
:
3651 /* 4-addr is harder to deal with, later maybe */
3652 if (sdata
->u
.mgd
.use_4addr
)
3654 /* software powersave is a huge mess, avoid all of it */
3655 if (ieee80211_hw_check(&local
->hw
, PS_NULLFUNC_STACK
))
3657 if (ieee80211_hw_check(&local
->hw
, SUPPORTS_PS
) &&
3658 !ieee80211_hw_check(&local
->hw
, SUPPORTS_DYNAMIC_PS
))
3660 if (sta
->sta
.tdls
) {
3661 fastrx
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
3662 fastrx
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
3663 fastrx
.expected_ds_bits
= 0;
3665 fastrx
.sta_notify
= sdata
->u
.mgd
.probe_send_count
> 0;
3666 fastrx
.da_offs
= offsetof(struct ieee80211_hdr
, addr1
);
3667 fastrx
.sa_offs
= offsetof(struct ieee80211_hdr
, addr3
);
3668 fastrx
.expected_ds_bits
=
3669 cpu_to_le16(IEEE80211_FCTL_FROMDS
);
3672 case NL80211_IFTYPE_AP_VLAN
:
3673 case NL80211_IFTYPE_AP
:
3674 /* parallel-rx requires this, at least with calls to
3675 * ieee80211_sta_ps_transition()
3677 if (!ieee80211_hw_check(&local
->hw
, AP_LINK_PS
))
3679 fastrx
.da_offs
= offsetof(struct ieee80211_hdr
, addr3
);
3680 fastrx
.sa_offs
= offsetof(struct ieee80211_hdr
, addr2
);
3681 fastrx
.expected_ds_bits
= cpu_to_le16(IEEE80211_FCTL_TODS
);
3683 fastrx
.internal_forward
=
3684 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
3685 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
||
3686 !sdata
->u
.vlan
.sta
);
3692 if (!test_sta_flag(sta
, WLAN_STA_AUTHORIZED
))
3696 key
= rcu_dereference(sta
->ptk
[sta
->ptk_idx
]);
3698 switch (key
->conf
.cipher
) {
3699 case WLAN_CIPHER_SUITE_TKIP
:
3700 /* we don't want to deal with MMIC in fast-rx */
3702 case WLAN_CIPHER_SUITE_CCMP
:
3703 case WLAN_CIPHER_SUITE_CCMP_256
:
3704 case WLAN_CIPHER_SUITE_GCMP
:
3705 case WLAN_CIPHER_SUITE_GCMP_256
:
3708 /* we also don't want to deal with WEP or cipher scheme
3709 * since those require looking up the key idx in the
3710 * frame, rather than assuming the PTK is used
3711 * (we need to revisit this once we implement the real
3712 * PTK index, which is now valid in the spec, but we
3713 * haven't implemented that part yet)
3719 fastrx
.icv_len
= key
->conf
.icv_len
;
3726 __release(check_fast_rx
);
3729 new = kmemdup(&fastrx
, sizeof(fastrx
), GFP_KERNEL
);
3731 spin_lock_bh(&sta
->lock
);
3732 old
= rcu_dereference_protected(sta
->fast_rx
, true);
3733 rcu_assign_pointer(sta
->fast_rx
, new);
3734 spin_unlock_bh(&sta
->lock
);
3737 kfree_rcu(old
, rcu_head
);
3740 void ieee80211_clear_fast_rx(struct sta_info
*sta
)
3742 struct ieee80211_fast_rx
*old
;
3744 spin_lock_bh(&sta
->lock
);
3745 old
= rcu_dereference_protected(sta
->fast_rx
, true);
3746 RCU_INIT_POINTER(sta
->fast_rx
, NULL
);
3747 spin_unlock_bh(&sta
->lock
);
3750 kfree_rcu(old
, rcu_head
);
3753 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data
*sdata
)
3755 struct ieee80211_local
*local
= sdata
->local
;
3756 struct sta_info
*sta
;
3758 lockdep_assert_held(&local
->sta_mtx
);
3760 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
3761 if (sdata
!= sta
->sdata
&&
3762 (!sta
->sdata
->bss
|| sta
->sdata
->bss
!= sdata
->bss
))
3764 ieee80211_check_fast_rx(sta
);
3768 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data
*sdata
)
3770 struct ieee80211_local
*local
= sdata
->local
;
3772 mutex_lock(&local
->sta_mtx
);
3773 __ieee80211_check_fast_rx_iface(sdata
);
3774 mutex_unlock(&local
->sta_mtx
);
3777 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data
*rx
,
3778 struct ieee80211_fast_rx
*fast_rx
)
3780 struct sk_buff
*skb
= rx
->skb
;
3781 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3782 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3783 struct sta_info
*sta
= rx
->sta
;
3784 int orig_len
= skb
->len
;
3785 int snap_offs
= ieee80211_hdrlen(hdr
->frame_control
);
3787 u8 snap
[sizeof(rfc1042_header
)];
3789 } *payload
__aligned(2);
3793 } addrs
__aligned(2);
3794 struct ieee80211_sta_rx_stats
*stats
= &sta
->rx_stats
;
3796 if (fast_rx
->uses_rss
)
3797 stats
= this_cpu_ptr(sta
->pcpu_rx_stats
);
3799 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3800 * to a common data structure; drivers can implement that per queue
3801 * but we don't have that information in mac80211
3803 if (!(status
->flag
& RX_FLAG_DUP_VALIDATED
))
3806 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3808 /* If using encryption, we also need to have:
3809 * - PN_VALIDATED: similar, but the implementation is tricky
3810 * - DECRYPTED: necessary for PN_VALIDATED
3813 (status
->flag
& FAST_RX_CRYPT_FLAGS
) != FAST_RX_CRYPT_FLAGS
)
3816 /* we don't deal with A-MSDU deaggregation here */
3817 if (status
->rx_flags
& IEEE80211_RX_AMSDU
)
3820 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
3823 if (unlikely(ieee80211_is_frag(hdr
)))
3826 /* Since our interface address cannot be multicast, this
3827 * implicitly also rejects multicast frames without the
3830 * We shouldn't get any *data* frames not addressed to us
3831 * (AP mode will accept multicast *management* frames), but
3832 * punting here will make it go through the full checks in
3833 * ieee80211_accept_frame().
3835 if (!ether_addr_equal(fast_rx
->vif_addr
, hdr
->addr1
))
3838 if ((hdr
->frame_control
& cpu_to_le16(IEEE80211_FCTL_FROMDS
|
3839 IEEE80211_FCTL_TODS
)) !=
3840 fast_rx
->expected_ds_bits
)
3843 /* assign the key to drop unencrypted frames (later)
3844 * and strip the IV/MIC if necessary
3846 if (fast_rx
->key
&& !(status
->flag
& RX_FLAG_IV_STRIPPED
)) {
3847 /* GCMP header length is the same */
3848 snap_offs
+= IEEE80211_CCMP_HDR_LEN
;
3851 if (!pskb_may_pull(skb
, snap_offs
+ sizeof(*payload
)))
3853 payload
= (void *)(skb
->data
+ snap_offs
);
3855 if (!ether_addr_equal(payload
->snap
, fast_rx
->rfc1042_hdr
))
3858 /* Don't handle these here since they require special code.
3859 * Accept AARP and IPX even though they should come with a
3860 * bridge-tunnel header - but if we get them this way then
3861 * there's little point in discarding them.
3863 if (unlikely(payload
->proto
== cpu_to_be16(ETH_P_TDLS
) ||
3864 payload
->proto
== fast_rx
->control_port_protocol
))
3867 /* after this point, don't punt to the slowpath! */
3869 if (rx
->key
&& !(status
->flag
& RX_FLAG_MIC_STRIPPED
) &&
3870 pskb_trim(skb
, skb
->len
- fast_rx
->icv_len
))
3873 if (unlikely(fast_rx
->sta_notify
)) {
3874 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
3875 fast_rx
->sta_notify
= false;
3878 /* statistics part of ieee80211_rx_h_sta_process() */
3879 stats
->last_rx
= jiffies
;
3880 stats
->last_rate
= sta_stats_encode_rate(status
);
3884 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
3885 stats
->last_signal
= status
->signal
;
3886 if (!fast_rx
->uses_rss
)
3887 ewma_signal_add(&sta
->rx_stats_avg
.signal
,
3891 if (status
->chains
) {
3894 stats
->chains
= status
->chains
;
3895 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
3896 int signal
= status
->chain_signal
[i
];
3898 if (!(status
->chains
& BIT(i
)))
3901 stats
->chain_signal_last
[i
] = signal
;
3902 if (!fast_rx
->uses_rss
)
3903 ewma_signal_add(&sta
->rx_stats_avg
.chain_signal
[i
],
3907 /* end of statistics */
3909 if (rx
->key
&& !ieee80211_has_protected(hdr
->frame_control
))
3912 /* do the header conversion - first grab the addresses */
3913 ether_addr_copy(addrs
.da
, skb
->data
+ fast_rx
->da_offs
);
3914 ether_addr_copy(addrs
.sa
, skb
->data
+ fast_rx
->sa_offs
);
3915 /* remove the SNAP but leave the ethertype */
3916 skb_pull(skb
, snap_offs
+ sizeof(rfc1042_header
));
3917 /* push the addresses in front */
3918 memcpy(skb_push(skb
, sizeof(addrs
)), &addrs
, sizeof(addrs
));
3920 skb
->dev
= fast_rx
->dev
;
3922 ieee80211_rx_stats(fast_rx
->dev
, skb
->len
);
3924 /* The seqno index has the same property as needed
3925 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3926 * for non-QoS-data frames. Here we know it's a data
3927 * frame, so count MSDUs.
3929 u64_stats_update_begin(&stats
->syncp
);
3930 stats
->msdu
[rx
->seqno_idx
]++;
3931 stats
->bytes
+= orig_len
;
3932 u64_stats_update_end(&stats
->syncp
);
3934 if (fast_rx
->internal_forward
) {
3935 struct sk_buff
*xmit_skb
= NULL
;
3936 bool multicast
= is_multicast_ether_addr(skb
->data
);
3939 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
3940 } else if (sta_info_get(rx
->sdata
, skb
->data
)) {
3947 * Send to wireless media and increase priority by 256
3948 * to keep the received priority instead of
3949 * reclassifying the frame (see cfg80211_classify8021d).
3951 xmit_skb
->priority
+= 256;
3952 xmit_skb
->protocol
= htons(ETH_P_802_3
);
3953 skb_reset_network_header(xmit_skb
);
3954 skb_reset_mac_header(xmit_skb
);
3955 dev_queue_xmit(xmit_skb
);
3962 /* deliver to local stack */
3963 skb
->protocol
= eth_type_trans(skb
, fast_rx
->dev
);
3964 memset(skb
->cb
, 0, sizeof(skb
->cb
));
3966 napi_gro_receive(rx
->napi
, skb
);
3968 netif_receive_skb(skb
);
3978 * This function returns whether or not the SKB
3979 * was destined for RX processing or not, which,
3980 * if consume is true, is equivalent to whether
3981 * or not the skb was consumed.
3983 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3984 struct sk_buff
*skb
, bool consume
)
3986 struct ieee80211_local
*local
= rx
->local
;
3987 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3991 /* See if we can do fast-rx; if we have to copy we already lost,
3992 * so punt in that case. We should never have to deliver a data
3993 * frame to multiple interfaces anyway.
3995 * We skip the ieee80211_accept_frame() call and do the necessary
3996 * checking inside ieee80211_invoke_fast_rx().
3998 if (consume
&& rx
->sta
) {
3999 struct ieee80211_fast_rx
*fast_rx
;
4001 fast_rx
= rcu_dereference(rx
->sta
->fast_rx
);
4002 if (fast_rx
&& ieee80211_invoke_fast_rx(rx
, fast_rx
))
4006 if (!ieee80211_accept_frame(rx
))
4010 skb
= skb_copy(skb
, GFP_ATOMIC
);
4012 if (net_ratelimit())
4013 wiphy_debug(local
->hw
.wiphy
,
4014 "failed to copy skb for %s\n",
4022 ieee80211_invoke_rx_handlers(rx
);
4027 * This is the actual Rx frames handler. as it belongs to Rx path it must
4028 * be called with rcu_read_lock protection.
4030 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
4031 struct ieee80211_sta
*pubsta
,
4032 struct sk_buff
*skb
,
4033 struct napi_struct
*napi
)
4035 struct ieee80211_local
*local
= hw_to_local(hw
);
4036 struct ieee80211_sub_if_data
*sdata
;
4037 struct ieee80211_hdr
*hdr
;
4039 struct ieee80211_rx_data rx
;
4040 struct ieee80211_sub_if_data
*prev
;
4041 struct rhlist_head
*tmp
;
4044 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
4045 memset(&rx
, 0, sizeof(rx
));
4050 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
4051 I802_DEBUG_INC(local
->dot11ReceivedFragmentCount
);
4053 if (ieee80211_is_mgmt(fc
)) {
4054 /* drop frame if too short for header */
4055 if (skb
->len
< ieee80211_hdrlen(fc
))
4058 err
= skb_linearize(skb
);
4060 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
4068 hdr
= (struct ieee80211_hdr
*)skb
->data
;
4069 ieee80211_parse_qos(&rx
);
4070 ieee80211_verify_alignment(&rx
);
4072 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
4073 ieee80211_is_beacon(hdr
->frame_control
)))
4074 ieee80211_scan_rx(local
, skb
);
4077 rx
.sta
= container_of(pubsta
, struct sta_info
, sta
);
4078 rx
.sdata
= rx
.sta
->sdata
;
4079 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
4082 } else if (ieee80211_is_data(fc
)) {
4083 struct sta_info
*sta
, *prev_sta
;
4087 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
4094 rx
.sdata
= prev_sta
->sdata
;
4095 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
4102 rx
.sdata
= prev_sta
->sdata
;
4104 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
4112 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
4113 if (!ieee80211_sdata_running(sdata
))
4116 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
4117 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
4121 * frame is destined for this interface, but if it's
4122 * not also for the previous one we handle that after
4123 * the loop to avoid copying the SKB once too much
4131 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
4133 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
4139 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
4142 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
4151 * This is the receive path handler. It is called by a low level driver when an
4152 * 802.11 MPDU is received from the hardware.
4154 void ieee80211_rx_napi(struct ieee80211_hw
*hw
, struct ieee80211_sta
*pubsta
,
4155 struct sk_buff
*skb
, struct napi_struct
*napi
)
4157 struct ieee80211_local
*local
= hw_to_local(hw
);
4158 struct ieee80211_rate
*rate
= NULL
;
4159 struct ieee80211_supported_band
*sband
;
4160 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
4162 WARN_ON_ONCE(softirq_count() == 0);
4164 if (WARN_ON(status
->band
>= NUM_NL80211_BANDS
))
4167 sband
= local
->hw
.wiphy
->bands
[status
->band
];
4168 if (WARN_ON(!sband
))
4172 * If we're suspending, it is possible although not too likely
4173 * that we'd be receiving frames after having already partially
4174 * quiesced the stack. We can't process such frames then since
4175 * that might, for example, cause stations to be added or other
4176 * driver callbacks be invoked.
4178 if (unlikely(local
->quiescing
|| local
->suspended
))
4181 /* We might be during a HW reconfig, prevent Rx for the same reason */
4182 if (unlikely(local
->in_reconfig
))
4186 * The same happens when we're not even started,
4187 * but that's worth a warning.
4189 if (WARN_ON(!local
->started
))
4192 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
4194 * Validate the rate, unless a PLCP error means that
4195 * we probably can't have a valid rate here anyway.
4198 if (status
->flag
& RX_FLAG_HT
) {
4200 * rate_idx is MCS index, which can be [0-76]
4203 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4205 * Anything else would be some sort of driver or
4206 * hardware error. The driver should catch hardware
4209 if (WARN(status
->rate_idx
> 76,
4210 "Rate marked as an HT rate but passed "
4211 "status->rate_idx is not "
4212 "an MCS index [0-76]: %d (0x%02x)\n",
4216 } else if (status
->flag
& RX_FLAG_VHT
) {
4217 if (WARN_ONCE(status
->rate_idx
> 9 ||
4219 status
->vht_nss
> 8,
4220 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4221 status
->rate_idx
, status
->vht_nss
))
4224 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
4226 rate
= &sband
->bitrates
[status
->rate_idx
];
4230 status
->rx_flags
= 0;
4233 * key references and virtual interfaces are protected using RCU
4234 * and this requires that we are in a read-side RCU section during
4235 * receive processing
4240 * Frames with failed FCS/PLCP checksum are not returned,
4241 * all other frames are returned without radiotap header
4242 * if it was previously present.
4243 * Also, frames with less than 16 bytes are dropped.
4245 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
4251 ieee80211_tpt_led_trig_rx(local
,
4252 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
4255 __ieee80211_rx_handle_packet(hw
, pubsta
, skb
, napi
);
4263 EXPORT_SYMBOL(ieee80211_rx_napi
);
4265 /* This is a version of the rx handler that can be called from hard irq
4266 * context. Post the skb on the queue and schedule the tasklet */
4267 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
4269 struct ieee80211_local
*local
= hw_to_local(hw
);
4271 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
4273 skb
->pkt_type
= IEEE80211_RX_MSG
;
4274 skb_queue_tail(&local
->skb_queue
, skb
);
4275 tasklet_schedule(&local
->tasklet
);
4277 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);