2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
43 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
44 if (likely(skb
->len
> FCS_LEN
))
45 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
57 static inline bool should_drop_frame(struct sk_buff
*skb
, int present_fcs_len
)
59 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
60 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
62 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
63 RX_FLAG_FAILED_PLCP_CRC
|
64 RX_FLAG_AMPDU_IS_ZEROLEN
))
67 if (unlikely(skb
->len
< 16 + present_fcs_len
))
70 if (ieee80211_is_ctl(hdr
->frame_control
) &&
71 !ieee80211_is_pspoll(hdr
->frame_control
) &&
72 !ieee80211_is_back_req(hdr
->frame_control
))
79 ieee80211_rx_radiotap_space(struct ieee80211_local
*local
,
80 struct ieee80211_rx_status
*status
)
84 /* always present fields */
85 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
87 /* allocate extra bitmaps */
89 len
+= 4 * hweight8(status
->chains
);
91 if (ieee80211_have_rx_timestamp(status
)) {
95 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
98 /* antenna field, if we don't have per-chain info */
102 /* padding for RX_FLAGS if necessary */
105 if (status
->flag
& RX_FLAG_HT
) /* HT info */
108 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
113 if (status
->flag
& RX_FLAG_VHT
) {
118 if (status
->chains
) {
119 /* antenna and antenna signal fields */
120 len
+= 2 * hweight8(status
->chains
);
127 * ieee80211_add_rx_radiotap_header - add radiotap header
129 * add a radiotap header containing all the fields which the hardware provided.
132 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
134 struct ieee80211_rate
*rate
,
135 int rtap_len
, bool has_fcs
)
137 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
138 struct ieee80211_radiotap_header
*rthdr
;
143 u16 channel_flags
= 0;
145 unsigned long chains
= status
->chains
;
148 if (!(has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)))
151 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
152 memset(rthdr
, 0, rtap_len
);
153 it_present
= &rthdr
->it_present
;
155 /* radiotap header, set always present flags */
156 rthdr
->it_len
= cpu_to_le16(rtap_len
);
157 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
158 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
159 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
162 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
164 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
166 BIT(IEEE80211_RADIOTAP_EXT
) |
167 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
168 put_unaligned_le32(it_present_val
, it_present
);
170 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
171 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
174 put_unaligned_le32(it_present_val
, it_present
);
176 pos
= (void *)(it_present
+ 1);
178 /* the order of the following fields is important */
180 /* IEEE80211_RADIOTAP_TSFT */
181 if (ieee80211_have_rx_timestamp(status
)) {
183 while ((pos
- (u8
*)rthdr
) & 7)
186 ieee80211_calculate_rx_timestamp(local
, status
,
189 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
193 /* IEEE80211_RADIOTAP_FLAGS */
194 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
195 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
196 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
197 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
198 if (status
->flag
& RX_FLAG_SHORTPRE
)
199 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
202 /* IEEE80211_RADIOTAP_RATE */
203 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
205 * Without rate information don't add it. If we have,
206 * MCS information is a separate field in radiotap,
207 * added below. The byte here is needed as padding
208 * for the channel though, so initialise it to 0.
213 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
214 if (status
->flag
& RX_FLAG_10MHZ
)
216 else if (status
->flag
& RX_FLAG_5MHZ
)
218 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
222 /* IEEE80211_RADIOTAP_CHANNEL */
223 put_unaligned_le16(status
->freq
, pos
);
225 if (status
->flag
& RX_FLAG_10MHZ
)
226 channel_flags
|= IEEE80211_CHAN_HALF
;
227 else if (status
->flag
& RX_FLAG_5MHZ
)
228 channel_flags
|= IEEE80211_CHAN_QUARTER
;
230 if (status
->band
== IEEE80211_BAND_5GHZ
)
231 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
232 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
233 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
234 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
235 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
237 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
239 channel_flags
|= IEEE80211_CHAN_2GHZ
;
240 put_unaligned_le16(channel_flags
, pos
);
243 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
244 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
245 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
246 *pos
= status
->signal
;
248 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
252 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
254 if (!status
->chains
) {
255 /* IEEE80211_RADIOTAP_ANTENNA */
256 *pos
= status
->antenna
;
260 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
262 /* IEEE80211_RADIOTAP_RX_FLAGS */
263 /* ensure 2 byte alignment for the 2 byte field as required */
264 if ((pos
- (u8
*)rthdr
) & 1)
266 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
267 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
268 put_unaligned_le16(rx_flags
, pos
);
271 if (status
->flag
& RX_FLAG_HT
) {
274 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
275 *pos
++ = local
->hw
.radiotap_mcs_details
;
277 if (status
->flag
& RX_FLAG_SHORT_GI
)
278 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
279 if (status
->flag
& RX_FLAG_40MHZ
)
280 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
281 if (status
->flag
& RX_FLAG_HT_GF
)
282 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
283 if (status
->flag
& RX_FLAG_LDPC
)
284 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
285 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
286 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
288 *pos
++ = status
->rate_idx
;
291 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
294 /* ensure 4 byte alignment */
295 while ((pos
- (u8
*)rthdr
) & 3)
298 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
299 put_unaligned_le32(status
->ampdu_reference
, pos
);
301 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
302 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
303 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
304 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
305 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
306 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
307 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
308 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
309 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
310 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
311 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
312 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
313 put_unaligned_le16(flags
, pos
);
315 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
316 *pos
++ = status
->ampdu_delimiter_crc
;
322 if (status
->flag
& RX_FLAG_VHT
) {
323 u16 known
= local
->hw
.radiotap_vht_details
;
325 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
326 /* known field - how to handle 80+80? */
327 if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
328 known
&= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
;
329 put_unaligned_le16(known
, pos
);
332 if (status
->flag
& RX_FLAG_SHORT_GI
)
333 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
334 /* in VHT, STBC is binary */
335 if (status
->flag
& RX_FLAG_STBC_MASK
)
336 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
337 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
338 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
341 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
343 else if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
344 *pos
++ = 0; /* marked not known above */
345 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
347 else if (status
->flag
& RX_FLAG_40MHZ
)
352 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
355 if (status
->flag
& RX_FLAG_LDPC
)
356 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
364 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
365 *pos
++ = status
->chain_signal
[chain
];
371 * This function copies a received frame to all monitor interfaces and
372 * returns a cleaned-up SKB that no longer includes the FCS nor the
373 * radiotap header the driver might have added.
375 static struct sk_buff
*
376 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
377 struct ieee80211_rate
*rate
)
379 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
380 struct ieee80211_sub_if_data
*sdata
;
382 struct sk_buff
*skb
, *skb2
;
383 struct net_device
*prev_dev
= NULL
;
384 int present_fcs_len
= 0;
387 * First, we may need to make a copy of the skb because
388 * (1) we need to modify it for radiotap (if not present), and
389 * (2) the other RX handlers will modify the skb we got.
391 * We don't need to, of course, if we aren't going to return
392 * the SKB because it has a bad FCS/PLCP checksum.
395 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
396 present_fcs_len
= FCS_LEN
;
398 /* ensure hdr->frame_control is in skb head */
399 if (!pskb_may_pull(origskb
, 2)) {
400 dev_kfree_skb(origskb
);
404 if (!local
->monitors
) {
405 if (should_drop_frame(origskb
, present_fcs_len
)) {
406 dev_kfree_skb(origskb
);
410 return remove_monitor_info(local
, origskb
);
413 /* room for the radiotap header based on driver features */
414 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
416 if (should_drop_frame(origskb
, present_fcs_len
)) {
417 /* only need to expand headroom if necessary */
422 * This shouldn't trigger often because most devices have an
423 * RX header they pull before we get here, and that should
424 * be big enough for our radiotap information. We should
425 * probably export the length to drivers so that we can have
426 * them allocate enough headroom to start with.
428 if (skb_headroom(skb
) < needed_headroom
&&
429 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
435 * Need to make a copy and possibly remove radiotap header
436 * and FCS from the original.
438 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
440 origskb
= remove_monitor_info(local
, origskb
);
446 /* prepend radiotap information */
447 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
450 skb_reset_mac_header(skb
);
451 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
452 skb
->pkt_type
= PACKET_OTHERHOST
;
453 skb
->protocol
= htons(ETH_P_802_2
);
455 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
456 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
459 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
462 if (!ieee80211_sdata_running(sdata
))
466 skb2
= skb_clone(skb
, GFP_ATOMIC
);
468 skb2
->dev
= prev_dev
;
469 netif_receive_skb(skb2
);
473 prev_dev
= sdata
->dev
;
474 sdata
->dev
->stats
.rx_packets
++;
475 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
480 netif_receive_skb(skb
);
487 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
489 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
490 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
491 int tid
, seqno_idx
, security_idx
;
493 /* does the frame have a qos control field? */
494 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
495 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
496 /* frame has qos control */
497 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
498 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
499 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
505 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
507 * Sequence numbers for management frames, QoS data
508 * frames with a broadcast/multicast address in the
509 * Address 1 field, and all non-QoS data frames sent
510 * by QoS STAs are assigned using an additional single
511 * modulo-4096 counter, [...]
513 * We also use that counter for non-QoS STAs.
515 seqno_idx
= IEEE80211_NUM_TIDS
;
517 if (ieee80211_is_mgmt(hdr
->frame_control
))
518 security_idx
= IEEE80211_NUM_TIDS
;
522 rx
->seqno_idx
= seqno_idx
;
523 rx
->security_idx
= security_idx
;
524 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
525 * For now, set skb->priority to 0 for other cases. */
526 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
530 * DOC: Packet alignment
532 * Drivers always need to pass packets that are aligned to two-byte boundaries
535 * Additionally, should, if possible, align the payload data in a way that
536 * guarantees that the contained IP header is aligned to a four-byte
537 * boundary. In the case of regular frames, this simply means aligning the
538 * payload to a four-byte boundary (because either the IP header is directly
539 * contained, or IV/RFC1042 headers that have a length divisible by four are
540 * in front of it). If the payload data is not properly aligned and the
541 * architecture doesn't support efficient unaligned operations, mac80211
542 * will align the data.
544 * With A-MSDU frames, however, the payload data address must yield two modulo
545 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
546 * push the IP header further back to a multiple of four again. Thankfully, the
547 * specs were sane enough this time around to require padding each A-MSDU
548 * subframe to a length that is a multiple of four.
550 * Padding like Atheros hardware adds which is between the 802.11 header and
551 * the payload is not supported, the driver is required to move the 802.11
552 * header to be directly in front of the payload in that case.
554 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
558 "unaligned packet at 0x%p\n", rx
->skb
->data
);
565 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
567 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
569 if (is_multicast_ether_addr(hdr
->addr1
))
572 return ieee80211_is_robust_mgmt_frame(skb
);
576 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
578 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
580 if (!is_multicast_ether_addr(hdr
->addr1
))
583 return ieee80211_is_robust_mgmt_frame(skb
);
587 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
588 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
590 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
591 struct ieee80211_mmie
*mmie
;
593 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
596 if (!ieee80211_is_robust_mgmt_frame(skb
))
597 return -1; /* not a robust management frame */
599 mmie
= (struct ieee80211_mmie
*)
600 (skb
->data
+ skb
->len
- sizeof(*mmie
));
601 if (mmie
->element_id
!= WLAN_EID_MMIE
||
602 mmie
->length
!= sizeof(*mmie
) - 2)
605 return le16_to_cpu(mmie
->key_id
);
608 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
611 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
616 fc
= hdr
->frame_control
;
617 hdrlen
= ieee80211_hdrlen(fc
);
619 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
622 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
623 keyid
&= cs
->key_idx_mask
;
624 keyid
>>= cs
->key_idx_shift
;
629 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
631 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
632 char *dev_addr
= rx
->sdata
->vif
.addr
;
634 if (ieee80211_is_data(hdr
->frame_control
)) {
635 if (is_multicast_ether_addr(hdr
->addr1
)) {
636 if (ieee80211_has_tods(hdr
->frame_control
) ||
637 !ieee80211_has_fromds(hdr
->frame_control
))
638 return RX_DROP_MONITOR
;
639 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
640 return RX_DROP_MONITOR
;
642 if (!ieee80211_has_a4(hdr
->frame_control
))
643 return RX_DROP_MONITOR
;
644 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
645 return RX_DROP_MONITOR
;
649 /* If there is not an established peer link and this is not a peer link
650 * establisment frame, beacon or probe, drop the frame.
653 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
654 struct ieee80211_mgmt
*mgmt
;
656 if (!ieee80211_is_mgmt(hdr
->frame_control
))
657 return RX_DROP_MONITOR
;
659 if (ieee80211_is_action(hdr
->frame_control
)) {
662 /* make sure category field is present */
663 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
664 return RX_DROP_MONITOR
;
666 mgmt
= (struct ieee80211_mgmt
*)hdr
;
667 category
= mgmt
->u
.action
.category
;
668 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
669 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
670 return RX_DROP_MONITOR
;
674 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
675 ieee80211_is_probe_resp(hdr
->frame_control
) ||
676 ieee80211_is_beacon(hdr
->frame_control
) ||
677 ieee80211_is_auth(hdr
->frame_control
))
680 return RX_DROP_MONITOR
;
686 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
687 struct tid_ampdu_rx
*tid_agg_rx
,
689 struct sk_buff_head
*frames
)
691 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
692 struct ieee80211_rx_status
*status
;
694 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
699 /* release the frame from the reorder ring buffer */
700 tid_agg_rx
->stored_mpdu_num
--;
701 tid_agg_rx
->reorder_buf
[index
] = NULL
;
702 status
= IEEE80211_SKB_RXCB(skb
);
703 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
704 __skb_queue_tail(frames
, skb
);
707 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
710 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
711 struct tid_ampdu_rx
*tid_agg_rx
,
713 struct sk_buff_head
*frames
)
717 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
719 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
720 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
721 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
727 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
728 * the skb was added to the buffer longer than this time ago, the earlier
729 * frames that have not yet been received are assumed to be lost and the skb
730 * can be released for processing. This may also release other skb's from the
731 * reorder buffer if there are no additional gaps between the frames.
733 * Callers must hold tid_agg_rx->reorder_lock.
735 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
737 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
738 struct tid_ampdu_rx
*tid_agg_rx
,
739 struct sk_buff_head
*frames
)
743 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
745 /* release the buffer until next missing frame */
746 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
747 if (!tid_agg_rx
->reorder_buf
[index
] &&
748 tid_agg_rx
->stored_mpdu_num
) {
750 * No buffers ready to be released, but check whether any
751 * frames in the reorder buffer have timed out.
754 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
755 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
756 if (!tid_agg_rx
->reorder_buf
[j
]) {
761 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
762 HT_RX_REORDER_BUF_TIMEOUT
))
763 goto set_release_timer
;
765 ht_dbg_ratelimited(sdata
,
766 "release an RX reorder frame due to timeout on earlier frames\n");
767 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
771 * Increment the head seq# also for the skipped slots.
773 tid_agg_rx
->head_seq_num
=
774 (tid_agg_rx
->head_seq_num
+
775 skipped
) & IEEE80211_SN_MASK
;
778 } else while (tid_agg_rx
->reorder_buf
[index
]) {
779 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
781 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
784 if (tid_agg_rx
->stored_mpdu_num
) {
785 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
787 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
788 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
789 if (tid_agg_rx
->reorder_buf
[j
])
795 mod_timer(&tid_agg_rx
->reorder_timer
,
796 tid_agg_rx
->reorder_time
[j
] + 1 +
797 HT_RX_REORDER_BUF_TIMEOUT
);
799 del_timer(&tid_agg_rx
->reorder_timer
);
804 * As this function belongs to the RX path it must be under
805 * rcu_read_lock protection. It returns false if the frame
806 * can be processed immediately, true if it was consumed.
808 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
809 struct tid_ampdu_rx
*tid_agg_rx
,
811 struct sk_buff_head
*frames
)
813 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
814 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
815 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
816 u16 head_seq_num
, buf_size
;
820 spin_lock(&tid_agg_rx
->reorder_lock
);
822 buf_size
= tid_agg_rx
->buf_size
;
823 head_seq_num
= tid_agg_rx
->head_seq_num
;
825 /* frame with out of date sequence number */
826 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
832 * If frame the sequence number exceeds our buffering window
833 * size release some previous frames to make room for this one.
835 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
836 head_seq_num
= ieee80211_sn_inc(
837 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
838 /* release stored frames up to new head to stack */
839 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
840 head_seq_num
, frames
);
843 /* Now the new frame is always in the range of the reordering buffer */
845 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
847 /* check if we already stored this frame */
848 if (tid_agg_rx
->reorder_buf
[index
]) {
854 * If the current MPDU is in the right order and nothing else
855 * is stored we can process it directly, no need to buffer it.
856 * If it is first but there's something stored, we may be able
857 * to release frames after this one.
859 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
860 tid_agg_rx
->stored_mpdu_num
== 0) {
861 tid_agg_rx
->head_seq_num
=
862 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
867 /* put the frame in the reordering buffer */
868 tid_agg_rx
->reorder_buf
[index
] = skb
;
869 tid_agg_rx
->reorder_time
[index
] = jiffies
;
870 tid_agg_rx
->stored_mpdu_num
++;
871 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
874 spin_unlock(&tid_agg_rx
->reorder_lock
);
879 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
880 * true if the MPDU was buffered, false if it should be processed.
882 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
883 struct sk_buff_head
*frames
)
885 struct sk_buff
*skb
= rx
->skb
;
886 struct ieee80211_local
*local
= rx
->local
;
887 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
888 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
889 struct sta_info
*sta
= rx
->sta
;
890 struct tid_ampdu_rx
*tid_agg_rx
;
894 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
895 is_multicast_ether_addr(hdr
->addr1
))
899 * filter the QoS data rx stream according to
900 * STA/TID and check if this STA/TID is on aggregation
906 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
907 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
908 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
910 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
914 /* qos null data frames are excluded */
915 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
918 /* not part of a BA session */
919 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
920 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
923 /* not actually part of this BA session */
924 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
927 /* new, potentially un-ordered, ampdu frame - process it */
929 /* reset session timer */
930 if (tid_agg_rx
->timeout
)
931 tid_agg_rx
->last_rx
= jiffies
;
933 /* if this mpdu is fragmented - terminate rx aggregation session */
934 sc
= le16_to_cpu(hdr
->seq_ctrl
);
935 if (sc
& IEEE80211_SCTL_FRAG
) {
936 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
937 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
938 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
943 * No locking needed -- we will only ever process one
944 * RX packet at a time, and thus own tid_agg_rx. All
945 * other code manipulating it needs to (and does) make
946 * sure that we cannot get to it any more before doing
949 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
954 __skb_queue_tail(frames
, skb
);
957 static ieee80211_rx_result debug_noinline
958 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
960 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
961 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
964 * Drop duplicate 802.11 retransmissions
965 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
967 if (rx
->skb
->len
>= 24 && rx
->sta
&&
968 !ieee80211_is_ctl(hdr
->frame_control
) &&
969 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
970 !is_multicast_ether_addr(hdr
->addr1
)) {
971 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
972 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
974 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
975 rx
->local
->dot11FrameDuplicateCount
++;
976 rx
->sta
->num_duplicates
++;
978 return RX_DROP_UNUSABLE
;
979 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
980 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
984 if (unlikely(rx
->skb
->len
< 16)) {
985 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
986 return RX_DROP_MONITOR
;
989 /* Drop disallowed frame classes based on STA auth/assoc state;
990 * IEEE 802.11, Chap 5.5.
992 * mac80211 filters only based on association state, i.e. it drops
993 * Class 3 frames from not associated stations. hostapd sends
994 * deauth/disassoc frames when needed. In addition, hostapd is
995 * responsible for filtering on both auth and assoc states.
998 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
999 return ieee80211_rx_mesh_check(rx
);
1001 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1002 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1003 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1004 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1005 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1007 * accept port control frames from the AP even when it's not
1008 * yet marked ASSOC to prevent a race where we don't set the
1009 * assoc bit quickly enough before it sends the first frame
1011 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1012 ieee80211_is_data_present(hdr
->frame_control
)) {
1013 unsigned int hdrlen
;
1016 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1018 if (rx
->skb
->len
< hdrlen
+ 8)
1019 return RX_DROP_MONITOR
;
1021 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1022 if (ethertype
== rx
->sdata
->control_port_protocol
)
1026 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1027 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1030 return RX_DROP_UNUSABLE
;
1032 return RX_DROP_MONITOR
;
1039 static ieee80211_rx_result debug_noinline
1040 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1042 struct ieee80211_local
*local
;
1043 struct ieee80211_hdr
*hdr
;
1044 struct sk_buff
*skb
;
1048 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1050 if (!local
->pspolling
)
1053 if (!ieee80211_has_fromds(hdr
->frame_control
))
1054 /* this is not from AP */
1057 if (!ieee80211_is_data(hdr
->frame_control
))
1060 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1061 /* AP has no more frames buffered for us */
1062 local
->pspolling
= false;
1066 /* more data bit is set, let's request a new frame from the AP */
1067 ieee80211_send_pspoll(local
, rx
->sdata
);
1072 static void sta_ps_start(struct sta_info
*sta
)
1074 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1075 struct ieee80211_local
*local
= sdata
->local
;
1078 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1079 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1080 ps
= &sdata
->bss
->ps
;
1084 atomic_inc(&ps
->num_sta_ps
);
1085 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1086 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1087 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1088 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1089 sta
->sta
.addr
, sta
->sta
.aid
);
1092 static void sta_ps_end(struct sta_info
*sta
)
1094 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1095 sta
->sta
.addr
, sta
->sta
.aid
);
1097 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1099 * Clear the flag only if the other one is still set
1100 * so that the TX path won't start TX'ing new frames
1101 * directly ... In the case that the driver flag isn't
1102 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1104 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1105 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1106 sta
->sta
.addr
, sta
->sta
.aid
);
1110 set_sta_flag(sta
, WLAN_STA_PS_DELIVER
);
1111 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1112 ieee80211_sta_ps_deliver_wakeup(sta
);
1115 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1117 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1120 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1122 /* Don't let the same PS state be set twice */
1123 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1124 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1128 sta_ps_start(sta_inf
);
1130 sta_ps_end(sta_inf
);
1134 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1136 static ieee80211_rx_result debug_noinline
1137 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1139 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1140 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1141 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1144 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1147 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1148 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1152 * The device handles station powersave, so don't do anything about
1153 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1154 * it to mac80211 since they're handled.)
1156 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1160 * Don't do anything if the station isn't already asleep. In
1161 * the uAPSD case, the station will probably be marked asleep,
1162 * in the PS-Poll case the station must be confused ...
1164 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1167 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1168 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1169 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1170 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1172 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1175 /* Free PS Poll skb here instead of returning RX_DROP that would
1176 * count as an dropped frame. */
1177 dev_kfree_skb(rx
->skb
);
1180 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1181 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1182 ieee80211_has_pm(hdr
->frame_control
) &&
1183 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1184 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1185 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1186 ac
= ieee802_1d_to_ac
[tid
& 7];
1189 * If this AC is not trigger-enabled do nothing.
1191 * NB: This could/should check a separate bitmap of trigger-
1192 * enabled queues, but for now we only implement uAPSD w/o
1193 * TSPEC changes to the ACs, so they're always the same.
1195 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1198 /* if we are in a service period, do nothing */
1199 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1202 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1203 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1205 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1211 static ieee80211_rx_result debug_noinline
1212 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1214 struct sta_info
*sta
= rx
->sta
;
1215 struct sk_buff
*skb
= rx
->skb
;
1216 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1217 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1224 * Update last_rx only for IBSS packets which are for the current
1225 * BSSID and for station already AUTHORIZED to avoid keeping the
1226 * current IBSS network alive in cases where other STAs start
1227 * using different BSSID. This will also give the station another
1228 * chance to restart the authentication/authorization in case
1229 * something went wrong the first time.
1231 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1232 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1233 NL80211_IFTYPE_ADHOC
);
1234 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1235 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1236 sta
->last_rx
= jiffies
;
1237 if (ieee80211_is_data(hdr
->frame_control
) &&
1238 !is_multicast_ether_addr(hdr
->addr1
)) {
1239 sta
->last_rx_rate_idx
= status
->rate_idx
;
1240 sta
->last_rx_rate_flag
= status
->flag
;
1241 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1242 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1245 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1247 * Mesh beacons will update last_rx when if they are found to
1248 * match the current local configuration when processed.
1250 sta
->last_rx
= jiffies
;
1251 if (ieee80211_is_data(hdr
->frame_control
)) {
1252 sta
->last_rx_rate_idx
= status
->rate_idx
;
1253 sta
->last_rx_rate_flag
= status
->flag
;
1254 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1255 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1259 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1262 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1263 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1265 sta
->rx_fragments
++;
1266 sta
->rx_bytes
+= rx
->skb
->len
;
1267 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1268 sta
->last_signal
= status
->signal
;
1269 ewma_add(&sta
->avg_signal
, -status
->signal
);
1272 if (status
->chains
) {
1273 sta
->chains
= status
->chains
;
1274 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1275 int signal
= status
->chain_signal
[i
];
1277 if (!(status
->chains
& BIT(i
)))
1280 sta
->chain_signal_last
[i
] = signal
;
1281 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1286 * Change STA power saving mode only at the end of a frame
1287 * exchange sequence.
1289 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1290 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1291 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1292 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1293 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1294 /* PM bit is only checked in frames where it isn't reserved,
1295 * in AP mode it's reserved in non-bufferable management frames
1296 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1298 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1299 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1300 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1301 if (!ieee80211_has_pm(hdr
->frame_control
))
1304 if (ieee80211_has_pm(hdr
->frame_control
))
1309 /* mesh power save support */
1310 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1311 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1314 * Drop (qos-)data::nullfunc frames silently, since they
1315 * are used only to control station power saving mode.
1317 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1318 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1319 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1322 * If we receive a 4-addr nullfunc frame from a STA
1323 * that was not moved to a 4-addr STA vlan yet send
1324 * the event to userspace and for older hostapd drop
1325 * the frame to the monitor interface.
1327 if (ieee80211_has_a4(hdr
->frame_control
) &&
1328 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1329 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1330 !rx
->sdata
->u
.vlan
.sta
))) {
1331 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1332 cfg80211_rx_unexpected_4addr_frame(
1333 rx
->sdata
->dev
, sta
->sta
.addr
,
1335 return RX_DROP_MONITOR
;
1338 * Update counter and free packet here to avoid
1339 * counting this as a dropped packed.
1342 dev_kfree_skb(rx
->skb
);
1347 } /* ieee80211_rx_h_sta_process */
1349 static ieee80211_rx_result debug_noinline
1350 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1352 struct sk_buff
*skb
= rx
->skb
;
1353 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1354 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1357 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1358 struct ieee80211_key
*sta_ptk
= NULL
;
1359 int mmie_keyidx
= -1;
1361 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1366 * There are four types of keys:
1367 * - GTK (group keys)
1368 * - IGTK (group keys for management frames)
1369 * - PTK (pairwise keys)
1370 * - STK (station-to-station pairwise keys)
1372 * When selecting a key, we have to distinguish between multicast
1373 * (including broadcast) and unicast frames, the latter can only
1374 * use PTKs and STKs while the former always use GTKs and IGTKs.
1375 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1376 * unicast frames can also use key indices like GTKs. Hence, if we
1377 * don't have a PTK/STK we check the key index for a WEP key.
1379 * Note that in a regular BSS, multicast frames are sent by the
1380 * AP only, associated stations unicast the frame to the AP first
1381 * which then multicasts it on their behalf.
1383 * There is also a slight problem in IBSS mode: GTKs are negotiated
1384 * with each station, that is something we don't currently handle.
1385 * The spec seems to expect that one negotiates the same key with
1386 * every station but there's no such requirement; VLANs could be
1391 * No point in finding a key and decrypting if the frame is neither
1392 * addressed to us nor a multicast frame.
1394 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1397 /* start without a key */
1399 fc
= hdr
->frame_control
;
1402 int keyid
= rx
->sta
->ptk_idx
;
1404 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1405 cs
= rx
->sta
->cipher_scheme
;
1406 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1407 if (unlikely(keyid
< 0))
1408 return RX_DROP_UNUSABLE
;
1410 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1413 if (!ieee80211_has_protected(fc
))
1414 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1416 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1418 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1419 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1421 /* Skip decryption if the frame is not protected. */
1422 if (!ieee80211_has_protected(fc
))
1424 } else if (mmie_keyidx
>= 0) {
1425 /* Broadcast/multicast robust management frame / BIP */
1426 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1427 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1430 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1431 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1432 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1434 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1436 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1437 } else if (!ieee80211_has_protected(fc
)) {
1439 * The frame was not protected, so skip decryption. However, we
1440 * need to set rx->key if there is a key that could have been
1441 * used so that the frame may be dropped if encryption would
1442 * have been expected.
1444 struct ieee80211_key
*key
= NULL
;
1445 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1448 if (ieee80211_is_mgmt(fc
) &&
1449 is_multicast_ether_addr(hdr
->addr1
) &&
1450 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1454 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1455 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1461 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1462 key
= rcu_dereference(sdata
->keys
[i
]);
1475 * The device doesn't give us the IV so we won't be
1476 * able to look up the key. That's ok though, we
1477 * don't need to decrypt the frame, we just won't
1478 * be able to keep statistics accurate.
1479 * Except for key threshold notifications, should
1480 * we somehow allow the driver to tell us which key
1481 * the hardware used if this flag is set?
1483 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1484 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1487 hdrlen
= ieee80211_hdrlen(fc
);
1490 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1492 if (unlikely(keyidx
< 0))
1493 return RX_DROP_UNUSABLE
;
1495 if (rx
->skb
->len
< 8 + hdrlen
)
1496 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1498 * no need to call ieee80211_wep_get_keyidx,
1499 * it verifies a bunch of things we've done already
1501 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1502 keyidx
= keyid
>> 6;
1505 /* check per-station GTK first, if multicast packet */
1506 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1507 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1509 /* if not found, try default key */
1511 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1514 * RSNA-protected unicast frames should always be
1515 * sent with pairwise or station-to-station keys,
1516 * but for WEP we allow using a key index as well.
1519 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1520 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1521 !is_multicast_ether_addr(hdr
->addr1
))
1527 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1528 return RX_DROP_MONITOR
;
1530 rx
->key
->tx_rx_count
++;
1531 /* TODO: add threshold stuff again */
1533 return RX_DROP_MONITOR
;
1536 switch (rx
->key
->conf
.cipher
) {
1537 case WLAN_CIPHER_SUITE_WEP40
:
1538 case WLAN_CIPHER_SUITE_WEP104
:
1539 result
= ieee80211_crypto_wep_decrypt(rx
);
1541 case WLAN_CIPHER_SUITE_TKIP
:
1542 result
= ieee80211_crypto_tkip_decrypt(rx
);
1544 case WLAN_CIPHER_SUITE_CCMP
:
1545 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1547 case WLAN_CIPHER_SUITE_AES_CMAC
:
1548 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1551 result
= ieee80211_crypto_hw_decrypt(rx
);
1554 /* the hdr variable is invalid after the decrypt handlers */
1556 /* either the frame has been decrypted or will be dropped */
1557 status
->flag
|= RX_FLAG_DECRYPTED
;
1562 static inline struct ieee80211_fragment_entry
*
1563 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1564 unsigned int frag
, unsigned int seq
, int rx_queue
,
1565 struct sk_buff
**skb
)
1567 struct ieee80211_fragment_entry
*entry
;
1569 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1570 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1571 sdata
->fragment_next
= 0;
1573 if (!skb_queue_empty(&entry
->skb_list
))
1574 __skb_queue_purge(&entry
->skb_list
);
1576 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1578 entry
->first_frag_time
= jiffies
;
1580 entry
->rx_queue
= rx_queue
;
1581 entry
->last_frag
= frag
;
1583 entry
->extra_len
= 0;
1588 static inline struct ieee80211_fragment_entry
*
1589 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1590 unsigned int frag
, unsigned int seq
,
1591 int rx_queue
, struct ieee80211_hdr
*hdr
)
1593 struct ieee80211_fragment_entry
*entry
;
1596 idx
= sdata
->fragment_next
;
1597 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1598 struct ieee80211_hdr
*f_hdr
;
1602 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1604 entry
= &sdata
->fragments
[idx
];
1605 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1606 entry
->rx_queue
!= rx_queue
||
1607 entry
->last_frag
+ 1 != frag
)
1610 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1613 * Check ftype and addresses are equal, else check next fragment
1615 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1616 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1617 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1618 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1621 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1622 __skb_queue_purge(&entry
->skb_list
);
1631 static ieee80211_rx_result debug_noinline
1632 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1634 struct ieee80211_hdr
*hdr
;
1637 unsigned int frag
, seq
;
1638 struct ieee80211_fragment_entry
*entry
;
1639 struct sk_buff
*skb
;
1640 struct ieee80211_rx_status
*status
;
1642 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1643 fc
= hdr
->frame_control
;
1645 if (ieee80211_is_ctl(fc
))
1648 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1649 frag
= sc
& IEEE80211_SCTL_FRAG
;
1651 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1652 is_multicast_ether_addr(hdr
->addr1
))) {
1653 /* not fragmented */
1656 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1658 if (skb_linearize(rx
->skb
))
1659 return RX_DROP_UNUSABLE
;
1662 * skb_linearize() might change the skb->data and
1663 * previously cached variables (in this case, hdr) need to
1664 * be refreshed with the new data.
1666 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1667 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1670 /* This is the first fragment of a new frame. */
1671 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1672 rx
->seqno_idx
, &(rx
->skb
));
1673 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1674 ieee80211_has_protected(fc
)) {
1675 int queue
= rx
->security_idx
;
1676 /* Store CCMP PN so that we can verify that the next
1677 * fragment has a sequential PN value. */
1679 memcpy(entry
->last_pn
,
1680 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1681 IEEE80211_CCMP_PN_LEN
);
1686 /* This is a fragment for a frame that should already be pending in
1687 * fragment cache. Add this fragment to the end of the pending entry.
1689 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1690 rx
->seqno_idx
, hdr
);
1692 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1693 return RX_DROP_MONITOR
;
1696 /* Verify that MPDUs within one MSDU have sequential PN values.
1697 * (IEEE 802.11i, 8.3.3.4.5) */
1700 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1702 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1703 return RX_DROP_UNUSABLE
;
1704 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1705 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1710 queue
= rx
->security_idx
;
1711 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1712 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1713 return RX_DROP_UNUSABLE
;
1714 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1717 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1718 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1719 entry
->last_frag
= frag
;
1720 entry
->extra_len
+= rx
->skb
->len
;
1721 if (ieee80211_has_morefrags(fc
)) {
1726 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1727 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1728 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1729 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1731 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1732 __skb_queue_purge(&entry
->skb_list
);
1733 return RX_DROP_UNUSABLE
;
1736 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1737 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1741 /* Complete frame has been reassembled - process it now */
1742 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1743 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1747 rx
->sta
->rx_packets
++;
1748 if (is_multicast_ether_addr(hdr
->addr1
))
1749 rx
->local
->dot11MulticastReceivedFrameCount
++;
1751 ieee80211_led_rx(rx
->local
);
1755 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1757 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1763 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1765 struct sk_buff
*skb
= rx
->skb
;
1766 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1769 * Pass through unencrypted frames if the hardware has
1770 * decrypted them already.
1772 if (status
->flag
& RX_FLAG_DECRYPTED
)
1775 /* Drop unencrypted frames if key is set. */
1776 if (unlikely(!ieee80211_has_protected(fc
) &&
1777 !ieee80211_is_nullfunc(fc
) &&
1778 ieee80211_is_data(fc
) &&
1779 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1785 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1787 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1788 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1789 __le16 fc
= hdr
->frame_control
;
1792 * Pass through unencrypted frames if the hardware has
1793 * decrypted them already.
1795 if (status
->flag
& RX_FLAG_DECRYPTED
)
1798 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1799 if (unlikely(!ieee80211_has_protected(fc
) &&
1800 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1802 if (ieee80211_is_deauth(fc
) ||
1803 ieee80211_is_disassoc(fc
))
1804 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1809 /* BIP does not use Protected field, so need to check MMIE */
1810 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1811 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1812 if (ieee80211_is_deauth(fc
) ||
1813 ieee80211_is_disassoc(fc
))
1814 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1820 * When using MFP, Action frames are not allowed prior to
1821 * having configured keys.
1823 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1824 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
1832 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1834 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1835 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1836 bool check_port_control
= false;
1837 struct ethhdr
*ehdr
;
1840 *port_control
= false;
1841 if (ieee80211_has_a4(hdr
->frame_control
) &&
1842 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1845 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1846 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1848 if (!sdata
->u
.mgd
.use_4addr
)
1851 check_port_control
= true;
1854 if (is_multicast_ether_addr(hdr
->addr1
) &&
1855 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1858 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1862 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1863 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1864 *port_control
= true;
1865 else if (check_port_control
)
1872 * requires that rx->skb is a frame with ethernet header
1874 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1876 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1877 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1878 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1881 * Allow EAPOL frames to us/the PAE group address regardless
1882 * of whether the frame was encrypted or not.
1884 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1885 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1886 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1889 if (ieee80211_802_1x_port_control(rx
) ||
1890 ieee80211_drop_unencrypted(rx
, fc
))
1897 * requires that rx->skb is a frame with ethernet header
1900 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1902 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1903 struct net_device
*dev
= sdata
->dev
;
1904 struct sk_buff
*skb
, *xmit_skb
;
1905 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1906 struct sta_info
*dsta
;
1907 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1912 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1913 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1914 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1915 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1916 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1917 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1919 * send multicast frames both to higher layers in
1920 * local net stack and back to the wireless medium
1922 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1924 net_info_ratelimited("%s: failed to clone multicast frame\n",
1927 dsta
= sta_info_get(sdata
, skb
->data
);
1930 * The destination station is associated to
1931 * this AP (in this VLAN), so send the frame
1932 * directly to it and do not pass it to local
1941 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1943 /* 'align' will only take the values 0 or 2 here since all
1944 * frames are required to be aligned to 2-byte boundaries
1945 * when being passed to mac80211; the code here works just
1946 * as well if that isn't true, but mac80211 assumes it can
1947 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1951 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
1953 if (WARN_ON(skb_headroom(skb
) < 3)) {
1957 u8
*data
= skb
->data
;
1958 size_t len
= skb_headlen(skb
);
1960 memmove(skb
->data
, data
, len
);
1961 skb_set_tail_pointer(skb
, len
);
1968 /* deliver to local stack */
1969 skb
->protocol
= eth_type_trans(skb
, dev
);
1970 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1971 if (rx
->local
->napi
)
1972 napi_gro_receive(rx
->local
->napi
, skb
);
1974 netif_receive_skb(skb
);
1979 * Send to wireless media and increase priority by 256 to
1980 * keep the received priority instead of reclassifying
1981 * the frame (see cfg80211_classify8021d).
1983 xmit_skb
->priority
+= 256;
1984 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1985 skb_reset_network_header(xmit_skb
);
1986 skb_reset_mac_header(xmit_skb
);
1987 dev_queue_xmit(xmit_skb
);
1991 static ieee80211_rx_result debug_noinline
1992 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1994 struct net_device
*dev
= rx
->sdata
->dev
;
1995 struct sk_buff
*skb
= rx
->skb
;
1996 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1997 __le16 fc
= hdr
->frame_control
;
1998 struct sk_buff_head frame_list
;
1999 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2001 if (unlikely(!ieee80211_is_data(fc
)))
2004 if (unlikely(!ieee80211_is_data_present(fc
)))
2005 return RX_DROP_MONITOR
;
2007 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2010 if (ieee80211_has_a4(hdr
->frame_control
) &&
2011 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2012 !rx
->sdata
->u
.vlan
.sta
)
2013 return RX_DROP_UNUSABLE
;
2015 if (is_multicast_ether_addr(hdr
->addr1
) &&
2016 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2017 rx
->sdata
->u
.vlan
.sta
) ||
2018 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2019 rx
->sdata
->u
.mgd
.use_4addr
)))
2020 return RX_DROP_UNUSABLE
;
2023 __skb_queue_head_init(&frame_list
);
2025 if (skb_linearize(skb
))
2026 return RX_DROP_UNUSABLE
;
2028 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2029 rx
->sdata
->vif
.type
,
2030 rx
->local
->hw
.extra_tx_headroom
, true);
2032 while (!skb_queue_empty(&frame_list
)) {
2033 rx
->skb
= __skb_dequeue(&frame_list
);
2035 if (!ieee80211_frame_allowed(rx
, fc
)) {
2036 dev_kfree_skb(rx
->skb
);
2039 dev
->stats
.rx_packets
++;
2040 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2042 ieee80211_deliver_skb(rx
);
2048 #ifdef CONFIG_MAC80211_MESH
2049 static ieee80211_rx_result
2050 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2052 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2053 struct ieee80211_tx_info
*info
;
2054 struct ieee80211s_hdr
*mesh_hdr
;
2055 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2056 struct ieee80211_local
*local
= rx
->local
;
2057 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2058 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2059 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2062 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2063 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2065 /* make sure fixed part of mesh header is there, also checks skb len */
2066 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2067 return RX_DROP_MONITOR
;
2069 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2071 /* make sure full mesh header is there, also checks skb len */
2072 if (!pskb_may_pull(rx
->skb
,
2073 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2074 return RX_DROP_MONITOR
;
2076 /* reload pointers */
2077 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2078 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2080 /* frame is in RMC, don't forward */
2081 if (ieee80211_is_data(hdr
->frame_control
) &&
2082 is_multicast_ether_addr(hdr
->addr1
) &&
2083 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2084 return RX_DROP_MONITOR
;
2086 if (!ieee80211_is_data(hdr
->frame_control
) ||
2087 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2091 return RX_DROP_MONITOR
;
2093 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2094 struct mesh_path
*mppath
;
2098 if (is_multicast_ether_addr(hdr
->addr1
)) {
2099 mpp_addr
= hdr
->addr3
;
2100 proxied_addr
= mesh_hdr
->eaddr1
;
2101 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2102 /* has_a4 already checked in ieee80211_rx_mesh_check */
2103 mpp_addr
= hdr
->addr4
;
2104 proxied_addr
= mesh_hdr
->eaddr2
;
2106 return RX_DROP_MONITOR
;
2110 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2112 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2114 spin_lock_bh(&mppath
->state_lock
);
2115 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2116 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2117 spin_unlock_bh(&mppath
->state_lock
);
2122 /* Frame has reached destination. Don't forward */
2123 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2124 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2127 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2128 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2129 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2130 return RX_DROP_MONITOR
;
2132 skb_set_queue_mapping(skb
, q
);
2134 if (!--mesh_hdr
->ttl
) {
2135 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2139 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2142 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2144 net_info_ratelimited("%s: failed to clone mesh frame\n",
2149 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2150 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2151 info
= IEEE80211_SKB_CB(fwd_skb
);
2152 memset(info
, 0, sizeof(*info
));
2153 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2154 info
->control
.vif
= &rx
->sdata
->vif
;
2155 info
->control
.jiffies
= jiffies
;
2156 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2157 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2158 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2159 /* update power mode indication when forwarding */
2160 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2161 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2162 /* mesh power mode flags updated in mesh_nexthop_lookup */
2163 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2165 /* unable to resolve next hop */
2166 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2168 WLAN_REASON_MESH_PATH_NOFORWARD
,
2170 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2172 return RX_DROP_MONITOR
;
2175 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2176 ieee80211_add_pending_skb(local
, fwd_skb
);
2178 if (is_multicast_ether_addr(hdr
->addr1
) ||
2179 sdata
->dev
->flags
& IFF_PROMISC
)
2182 return RX_DROP_MONITOR
;
2186 static ieee80211_rx_result debug_noinline
2187 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2189 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2190 struct ieee80211_local
*local
= rx
->local
;
2191 struct net_device
*dev
= sdata
->dev
;
2192 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2193 __le16 fc
= hdr
->frame_control
;
2197 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2200 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2201 return RX_DROP_MONITOR
;
2204 * Send unexpected-4addr-frame event to hostapd. For older versions,
2205 * also drop the frame to cooked monitor interfaces.
2207 if (ieee80211_has_a4(hdr
->frame_control
) &&
2208 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2210 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2211 cfg80211_rx_unexpected_4addr_frame(
2212 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2213 return RX_DROP_MONITOR
;
2216 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2218 return RX_DROP_UNUSABLE
;
2220 if (!ieee80211_frame_allowed(rx
, fc
))
2221 return RX_DROP_MONITOR
;
2223 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2224 unlikely(port_control
) && sdata
->bss
) {
2225 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2233 dev
->stats
.rx_packets
++;
2234 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2236 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2237 !is_multicast_ether_addr(
2238 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2239 (!local
->scanning
&&
2240 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2241 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2242 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2245 ieee80211_deliver_skb(rx
);
2250 static ieee80211_rx_result debug_noinline
2251 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2253 struct sk_buff
*skb
= rx
->skb
;
2254 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2255 struct tid_ampdu_rx
*tid_agg_rx
;
2259 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2262 if (ieee80211_is_back_req(bar
->frame_control
)) {
2264 __le16 control
, start_seq_num
;
2265 } __packed bar_data
;
2268 return RX_DROP_MONITOR
;
2270 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2271 &bar_data
, sizeof(bar_data
)))
2272 return RX_DROP_MONITOR
;
2274 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2276 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2278 return RX_DROP_MONITOR
;
2280 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2282 /* reset session timer */
2283 if (tid_agg_rx
->timeout
)
2284 mod_timer(&tid_agg_rx
->session_timer
,
2285 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2287 spin_lock(&tid_agg_rx
->reorder_lock
);
2288 /* release stored frames up to start of BAR */
2289 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2290 start_seq_num
, frames
);
2291 spin_unlock(&tid_agg_rx
->reorder_lock
);
2298 * After this point, we only want management frames,
2299 * so we can drop all remaining control frames to
2300 * cooked monitor interfaces.
2302 return RX_DROP_MONITOR
;
2305 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2306 struct ieee80211_mgmt
*mgmt
,
2309 struct ieee80211_local
*local
= sdata
->local
;
2310 struct sk_buff
*skb
;
2311 struct ieee80211_mgmt
*resp
;
2313 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2314 /* Not to own unicast address */
2318 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2319 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2320 /* Not from the current AP or not associated yet. */
2324 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2325 /* Too short SA Query request frame */
2329 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2333 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2334 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2335 memset(resp
, 0, 24);
2336 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2337 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2338 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2339 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2340 IEEE80211_STYPE_ACTION
);
2341 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2342 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2343 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2344 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2345 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2346 WLAN_SA_QUERY_TR_ID_LEN
);
2348 ieee80211_tx_skb(sdata
, skb
);
2351 static ieee80211_rx_result debug_noinline
2352 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2354 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2355 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2358 * From here on, look only at management frames.
2359 * Data and control frames are already handled,
2360 * and unknown (reserved) frames are useless.
2362 if (rx
->skb
->len
< 24)
2363 return RX_DROP_MONITOR
;
2365 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2366 return RX_DROP_MONITOR
;
2368 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2369 ieee80211_is_beacon(mgmt
->frame_control
) &&
2370 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2373 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2374 sig
= status
->signal
;
2376 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2377 rx
->skb
->data
, rx
->skb
->len
,
2379 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2382 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2383 return RX_DROP_MONITOR
;
2385 if (ieee80211_drop_unencrypted_mgmt(rx
))
2386 return RX_DROP_UNUSABLE
;
2391 static ieee80211_rx_result debug_noinline
2392 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2394 struct ieee80211_local
*local
= rx
->local
;
2395 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2396 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2397 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2398 int len
= rx
->skb
->len
;
2400 if (!ieee80211_is_action(mgmt
->frame_control
))
2403 /* drop too small frames */
2404 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2405 return RX_DROP_UNUSABLE
;
2407 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2408 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2409 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2410 return RX_DROP_UNUSABLE
;
2412 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2413 return RX_DROP_UNUSABLE
;
2415 switch (mgmt
->u
.action
.category
) {
2416 case WLAN_CATEGORY_HT
:
2417 /* reject HT action frames from stations not supporting HT */
2418 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2421 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2422 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2423 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2424 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2425 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2428 /* verify action & smps_control/chanwidth are present */
2429 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2432 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2433 case WLAN_HT_ACTION_SMPS
: {
2434 struct ieee80211_supported_band
*sband
;
2435 enum ieee80211_smps_mode smps_mode
;
2437 /* convert to HT capability */
2438 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2439 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2440 smps_mode
= IEEE80211_SMPS_OFF
;
2442 case WLAN_HT_SMPS_CONTROL_STATIC
:
2443 smps_mode
= IEEE80211_SMPS_STATIC
;
2445 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2446 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2452 /* if no change do nothing */
2453 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2455 rx
->sta
->sta
.smps_mode
= smps_mode
;
2457 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2459 rate_control_rate_update(local
, sband
, rx
->sta
,
2460 IEEE80211_RC_SMPS_CHANGED
);
2463 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2464 struct ieee80211_supported_band
*sband
;
2465 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2466 enum ieee80211_sta_rx_bandwidth new_bw
;
2468 /* If it doesn't support 40 MHz it can't change ... */
2469 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2470 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2473 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2474 new_bw
= IEEE80211_STA_RX_BW_20
;
2476 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2478 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2481 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2483 rate_control_rate_update(local
, sband
, rx
->sta
,
2484 IEEE80211_RC_BW_CHANGED
);
2492 case WLAN_CATEGORY_PUBLIC
:
2493 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2495 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2499 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2501 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2502 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2504 if (len
< offsetof(struct ieee80211_mgmt
,
2505 u
.action
.u
.ext_chan_switch
.variable
))
2508 case WLAN_CATEGORY_VHT
:
2509 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2510 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2511 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2512 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2513 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2516 /* verify action code is present */
2517 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2520 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2521 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2524 /* verify opmode is present */
2525 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2528 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2530 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2531 opmode
, status
->band
,
2539 case WLAN_CATEGORY_BACK
:
2540 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2541 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2542 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2543 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2544 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2547 /* verify action_code is present */
2548 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2551 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2552 case WLAN_ACTION_ADDBA_REQ
:
2553 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2554 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2557 case WLAN_ACTION_ADDBA_RESP
:
2558 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2559 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2562 case WLAN_ACTION_DELBA
:
2563 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2564 sizeof(mgmt
->u
.action
.u
.delba
)))
2572 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2573 /* verify action_code is present */
2574 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2577 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2578 case WLAN_ACTION_SPCT_MSR_REQ
:
2579 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2582 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2583 sizeof(mgmt
->u
.action
.u
.measurement
)))
2586 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2589 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2591 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2593 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2594 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2597 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2598 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2599 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2602 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2603 bssid
= sdata
->u
.mgd
.bssid
;
2604 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2605 bssid
= sdata
->u
.ibss
.bssid
;
2606 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2611 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2618 case WLAN_CATEGORY_SA_QUERY
:
2619 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2620 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2623 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2624 case WLAN_ACTION_SA_QUERY_REQUEST
:
2625 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2627 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2631 case WLAN_CATEGORY_SELF_PROTECTED
:
2632 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2633 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2636 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2637 case WLAN_SP_MESH_PEERING_OPEN
:
2638 case WLAN_SP_MESH_PEERING_CLOSE
:
2639 case WLAN_SP_MESH_PEERING_CONFIRM
:
2640 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2642 if (sdata
->u
.mesh
.user_mpm
)
2643 /* userspace handles this frame */
2646 case WLAN_SP_MGK_INFORM
:
2647 case WLAN_SP_MGK_ACK
:
2648 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2653 case WLAN_CATEGORY_MESH_ACTION
:
2654 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2655 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2658 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2660 if (mesh_action_is_path_sel(mgmt
) &&
2661 !mesh_path_sel_is_hwmp(sdata
))
2669 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2670 /* will return in the next handlers */
2675 rx
->sta
->rx_packets
++;
2676 dev_kfree_skb(rx
->skb
);
2680 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2681 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2682 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2684 rx
->sta
->rx_packets
++;
2688 static ieee80211_rx_result debug_noinline
2689 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2691 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2694 /* skip known-bad action frames and return them in the next handler */
2695 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2699 * Getting here means the kernel doesn't know how to handle
2700 * it, but maybe userspace does ... include returned frames
2701 * so userspace can register for those to know whether ones
2702 * it transmitted were processed or returned.
2705 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2706 sig
= status
->signal
;
2708 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2709 rx
->skb
->data
, rx
->skb
->len
, 0, GFP_ATOMIC
)) {
2711 rx
->sta
->rx_packets
++;
2712 dev_kfree_skb(rx
->skb
);
2719 static ieee80211_rx_result debug_noinline
2720 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2722 struct ieee80211_local
*local
= rx
->local
;
2723 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2724 struct sk_buff
*nskb
;
2725 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2726 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2728 if (!ieee80211_is_action(mgmt
->frame_control
))
2732 * For AP mode, hostapd is responsible for handling any action
2733 * frames that we didn't handle, including returning unknown
2734 * ones. For all other modes we will return them to the sender,
2735 * setting the 0x80 bit in the action category, as required by
2736 * 802.11-2012 9.24.4.
2737 * Newer versions of hostapd shall also use the management frame
2738 * registration mechanisms, but older ones still use cooked
2739 * monitor interfaces so push all frames there.
2741 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2742 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2743 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2744 return RX_DROP_MONITOR
;
2746 if (is_multicast_ether_addr(mgmt
->da
))
2747 return RX_DROP_MONITOR
;
2749 /* do not return rejected action frames */
2750 if (mgmt
->u
.action
.category
& 0x80)
2751 return RX_DROP_UNUSABLE
;
2753 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2756 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2758 nmgmt
->u
.action
.category
|= 0x80;
2759 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2760 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2762 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2764 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2765 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2767 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2768 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2769 IEEE80211_TX_CTL_NO_CCK_RATE
;
2770 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2772 local
->hw
.offchannel_tx_hw_queue
;
2775 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2778 dev_kfree_skb(rx
->skb
);
2782 static ieee80211_rx_result debug_noinline
2783 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2785 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2786 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2789 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2791 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2792 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2793 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2794 return RX_DROP_MONITOR
;
2797 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2798 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2799 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2800 /* process for all: mesh, mlme, ibss */
2802 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2803 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2804 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2805 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2806 if (is_multicast_ether_addr(mgmt
->da
) &&
2807 !is_broadcast_ether_addr(mgmt
->da
))
2808 return RX_DROP_MONITOR
;
2810 /* process only for station */
2811 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2812 return RX_DROP_MONITOR
;
2814 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2815 /* process only for ibss and mesh */
2816 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2817 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2818 return RX_DROP_MONITOR
;
2821 return RX_DROP_MONITOR
;
2824 /* queue up frame and kick off work to process it */
2825 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2826 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2827 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2829 rx
->sta
->rx_packets
++;
2834 /* TODO: use IEEE80211_RX_FRAGMENTED */
2835 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2836 struct ieee80211_rate
*rate
)
2838 struct ieee80211_sub_if_data
*sdata
;
2839 struct ieee80211_local
*local
= rx
->local
;
2840 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2841 struct net_device
*prev_dev
= NULL
;
2842 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2843 int needed_headroom
;
2846 * If cooked monitor has been processed already, then
2847 * don't do it again. If not, set the flag.
2849 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2851 rx
->flags
|= IEEE80211_RX_CMNTR
;
2853 /* If there are no cooked monitor interfaces, just free the SKB */
2854 if (!local
->cooked_mntrs
)
2857 /* room for the radiotap header based on driver features */
2858 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
2860 if (skb_headroom(skb
) < needed_headroom
&&
2861 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2864 /* prepend radiotap information */
2865 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2868 skb_set_mac_header(skb
, 0);
2869 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2870 skb
->pkt_type
= PACKET_OTHERHOST
;
2871 skb
->protocol
= htons(ETH_P_802_2
);
2873 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2874 if (!ieee80211_sdata_running(sdata
))
2877 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2878 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2882 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2884 skb2
->dev
= prev_dev
;
2885 netif_receive_skb(skb2
);
2889 prev_dev
= sdata
->dev
;
2890 sdata
->dev
->stats
.rx_packets
++;
2891 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2895 skb
->dev
= prev_dev
;
2896 netif_receive_skb(skb
);
2904 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2905 ieee80211_rx_result res
)
2908 case RX_DROP_MONITOR
:
2909 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2911 rx
->sta
->rx_dropped
++;
2914 struct ieee80211_rate
*rate
= NULL
;
2915 struct ieee80211_supported_band
*sband
;
2916 struct ieee80211_rx_status
*status
;
2918 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2920 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2921 if (!(status
->flag
& RX_FLAG_HT
) &&
2922 !(status
->flag
& RX_FLAG_VHT
))
2923 rate
= &sband
->bitrates
[status
->rate_idx
];
2925 ieee80211_rx_cooked_monitor(rx
, rate
);
2928 case RX_DROP_UNUSABLE
:
2929 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2931 rx
->sta
->rx_dropped
++;
2932 dev_kfree_skb(rx
->skb
);
2935 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2940 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2941 struct sk_buff_head
*frames
)
2943 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2944 struct sk_buff
*skb
;
2946 #define CALL_RXH(rxh) \
2949 if (res != RX_CONTINUE) \
2953 spin_lock_bh(&rx
->local
->rx_path_lock
);
2955 while ((skb
= __skb_dequeue(frames
))) {
2957 * all the other fields are valid across frames
2958 * that belong to an aMPDU since they are on the
2959 * same TID from the same station
2963 CALL_RXH(ieee80211_rx_h_check_more_data
)
2964 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2965 CALL_RXH(ieee80211_rx_h_sta_process
)
2966 CALL_RXH(ieee80211_rx_h_decrypt
)
2967 CALL_RXH(ieee80211_rx_h_defragment
)
2968 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2969 /* must be after MMIC verify so header is counted in MPDU mic */
2970 #ifdef CONFIG_MAC80211_MESH
2971 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2972 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2974 CALL_RXH(ieee80211_rx_h_amsdu
)
2975 CALL_RXH(ieee80211_rx_h_data
)
2977 /* special treatment -- needs the queue */
2978 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2979 if (res
!= RX_CONTINUE
)
2982 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2983 CALL_RXH(ieee80211_rx_h_action
)
2984 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2985 CALL_RXH(ieee80211_rx_h_action_return
)
2986 CALL_RXH(ieee80211_rx_h_mgmt
)
2989 ieee80211_rx_handlers_result(rx
, res
);
2994 spin_unlock_bh(&rx
->local
->rx_path_lock
);
2997 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2999 struct sk_buff_head reorder_release
;
3000 ieee80211_rx_result res
= RX_DROP_MONITOR
;
3002 __skb_queue_head_init(&reorder_release
);
3004 #define CALL_RXH(rxh) \
3007 if (res != RX_CONTINUE) \
3011 CALL_RXH(ieee80211_rx_h_check
)
3013 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3015 ieee80211_rx_handlers(rx
, &reorder_release
);
3019 ieee80211_rx_handlers_result(rx
, res
);
3025 * This function makes calls into the RX path, therefore
3026 * it has to be invoked under RCU read lock.
3028 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3030 struct sk_buff_head frames
;
3031 struct ieee80211_rx_data rx
= {
3033 .sdata
= sta
->sdata
,
3034 .local
= sta
->local
,
3035 /* This is OK -- must be QoS data frame */
3036 .security_idx
= tid
,
3040 struct tid_ampdu_rx
*tid_agg_rx
;
3042 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3046 __skb_queue_head_init(&frames
);
3048 spin_lock(&tid_agg_rx
->reorder_lock
);
3049 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3050 spin_unlock(&tid_agg_rx
->reorder_lock
);
3052 ieee80211_rx_handlers(&rx
, &frames
);
3055 /* main receive path */
3057 static bool prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3058 struct ieee80211_hdr
*hdr
)
3060 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3061 struct sk_buff
*skb
= rx
->skb
;
3062 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3063 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3064 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3066 switch (sdata
->vif
.type
) {
3067 case NL80211_IFTYPE_STATION
:
3068 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3071 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3072 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3073 sdata
->u
.mgd
.use_4addr
)
3075 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3078 case NL80211_IFTYPE_ADHOC
:
3081 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3082 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3084 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3086 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3088 } else if (!multicast
&&
3089 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3090 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3092 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3093 } else if (!rx
->sta
) {
3095 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3096 rate_idx
= 0; /* TODO: HT/VHT rates */
3098 rate_idx
= status
->rate_idx
;
3099 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3103 case NL80211_IFTYPE_MESH_POINT
:
3105 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3106 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3109 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3112 case NL80211_IFTYPE_AP_VLAN
:
3113 case NL80211_IFTYPE_AP
:
3115 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3117 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3119 * Accept public action frames even when the
3120 * BSSID doesn't match, this is used for P2P
3121 * and location updates. Note that mac80211
3122 * itself never looks at these frames.
3125 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3127 if (ieee80211_is_public_action(hdr
, skb
->len
))
3129 if (!ieee80211_is_beacon(hdr
->frame_control
))
3131 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3134 case NL80211_IFTYPE_WDS
:
3135 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3137 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3140 case NL80211_IFTYPE_P2P_DEVICE
:
3141 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3142 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3143 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3144 !ieee80211_is_beacon(hdr
->frame_control
))
3146 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3148 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3151 /* should never get here */
3160 * This function returns whether or not the SKB
3161 * was destined for RX processing or not, which,
3162 * if consume is true, is equivalent to whether
3163 * or not the skb was consumed.
3165 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3166 struct sk_buff
*skb
, bool consume
)
3168 struct ieee80211_local
*local
= rx
->local
;
3169 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3170 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3171 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3174 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3176 if (!prepare_for_handlers(rx
, hdr
))
3180 skb
= skb_copy(skb
, GFP_ATOMIC
);
3182 if (net_ratelimit())
3183 wiphy_debug(local
->hw
.wiphy
,
3184 "failed to copy skb for %s\n",
3192 ieee80211_invoke_rx_handlers(rx
);
3197 * This is the actual Rx frames handler. as it belongs to Rx path it must
3198 * be called with rcu_read_lock protection.
3200 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3201 struct sk_buff
*skb
)
3203 struct ieee80211_local
*local
= hw_to_local(hw
);
3204 struct ieee80211_sub_if_data
*sdata
;
3205 struct ieee80211_hdr
*hdr
;
3207 struct ieee80211_rx_data rx
;
3208 struct ieee80211_sub_if_data
*prev
;
3209 struct sta_info
*sta
, *tmp
, *prev_sta
;
3212 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3213 memset(&rx
, 0, sizeof(rx
));
3217 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3218 local
->dot11ReceivedFragmentCount
++;
3220 if (ieee80211_is_mgmt(fc
)) {
3221 /* drop frame if too short for header */
3222 if (skb
->len
< ieee80211_hdrlen(fc
))
3225 err
= skb_linearize(skb
);
3227 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3235 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3236 ieee80211_parse_qos(&rx
);
3237 ieee80211_verify_alignment(&rx
);
3239 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3240 ieee80211_is_beacon(hdr
->frame_control
)))
3241 ieee80211_scan_rx(local
, skb
);
3243 if (ieee80211_is_data(fc
)) {
3246 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3253 rx
.sdata
= prev_sta
->sdata
;
3254 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3261 rx
.sdata
= prev_sta
->sdata
;
3263 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3271 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3272 if (!ieee80211_sdata_running(sdata
))
3275 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3276 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3280 * frame is destined for this interface, but if it's
3281 * not also for the previous one we handle that after
3282 * the loop to avoid copying the SKB once too much
3290 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3292 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3298 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3301 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3310 * This is the receive path handler. It is called by a low level driver when an
3311 * 802.11 MPDU is received from the hardware.
3313 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3315 struct ieee80211_local
*local
= hw_to_local(hw
);
3316 struct ieee80211_rate
*rate
= NULL
;
3317 struct ieee80211_supported_band
*sband
;
3318 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3320 WARN_ON_ONCE(softirq_count() == 0);
3322 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3325 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3326 if (WARN_ON(!sband
))
3330 * If we're suspending, it is possible although not too likely
3331 * that we'd be receiving frames after having already partially
3332 * quiesced the stack. We can't process such frames then since
3333 * that might, for example, cause stations to be added or other
3334 * driver callbacks be invoked.
3336 if (unlikely(local
->quiescing
|| local
->suspended
))
3339 /* We might be during a HW reconfig, prevent Rx for the same reason */
3340 if (unlikely(local
->in_reconfig
))
3344 * The same happens when we're not even started,
3345 * but that's worth a warning.
3347 if (WARN_ON(!local
->started
))
3350 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3352 * Validate the rate, unless a PLCP error means that
3353 * we probably can't have a valid rate here anyway.
3356 if (status
->flag
& RX_FLAG_HT
) {
3358 * rate_idx is MCS index, which can be [0-76]
3361 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3363 * Anything else would be some sort of driver or
3364 * hardware error. The driver should catch hardware
3367 if (WARN(status
->rate_idx
> 76,
3368 "Rate marked as an HT rate but passed "
3369 "status->rate_idx is not "
3370 "an MCS index [0-76]: %d (0x%02x)\n",
3374 } else if (status
->flag
& RX_FLAG_VHT
) {
3375 if (WARN_ONCE(status
->rate_idx
> 9 ||
3377 status
->vht_nss
> 8,
3378 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3379 status
->rate_idx
, status
->vht_nss
))
3382 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3384 rate
= &sband
->bitrates
[status
->rate_idx
];
3388 status
->rx_flags
= 0;
3391 * key references and virtual interfaces are protected using RCU
3392 * and this requires that we are in a read-side RCU section during
3393 * receive processing
3398 * Frames with failed FCS/PLCP checksum are not returned,
3399 * all other frames are returned without radiotap header
3400 * if it was previously present.
3401 * Also, frames with less than 16 bytes are dropped.
3403 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3409 ieee80211_tpt_led_trig_rx(local
,
3410 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3412 __ieee80211_rx_handle_packet(hw
, skb
);
3420 EXPORT_SYMBOL(ieee80211_rx
);
3422 /* This is a version of the rx handler that can be called from hard irq
3423 * context. Post the skb on the queue and schedule the tasklet */
3424 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3426 struct ieee80211_local
*local
= hw_to_local(hw
);
3428 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3430 skb
->pkt_type
= IEEE80211_RX_MSG
;
3431 skb_queue_tail(&local
->skb_queue
, skb
);
3432 tasklet_schedule(&local
->tasklet
);
3434 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);