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 int 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
;
62 hdr
= (void *)(skb
->data
);
64 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
65 RX_FLAG_FAILED_PLCP_CRC
|
66 RX_FLAG_AMPDU_IS_ZEROLEN
))
68 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
))
78 ieee80211_rx_radiotap_space(struct ieee80211_local
*local
,
79 struct ieee80211_rx_status
*status
)
83 /* always present fields */
84 len
= sizeof(struct ieee80211_radiotap_header
) + 8;
86 /* allocate extra bitmaps */
88 len
+= 4 * hweight8(status
->chains
);
90 if (ieee80211_have_rx_timestamp(status
)) {
94 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
97 /* antenna field, if we don't have per-chain info */
101 /* padding for RX_FLAGS if necessary */
104 if (status
->flag
& RX_FLAG_HT
) /* HT info */
107 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
112 if (status
->flag
& RX_FLAG_VHT
) {
117 if (status
->chains
) {
118 /* antenna and antenna signal fields */
119 len
+= 2 * hweight8(status
->chains
);
126 * ieee80211_add_rx_radiotap_header - add radiotap header
128 * add a radiotap header containing all the fields which the hardware provided.
131 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
133 struct ieee80211_rate
*rate
,
134 int rtap_len
, bool has_fcs
)
136 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
137 struct ieee80211_radiotap_header
*rthdr
;
142 u16 channel_flags
= 0;
144 unsigned long chains
= status
->chains
;
147 if (!(has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)))
150 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
151 memset(rthdr
, 0, rtap_len
);
152 it_present
= &rthdr
->it_present
;
154 /* radiotap header, set always present flags */
155 rthdr
->it_len
= cpu_to_le16(rtap_len
);
156 it_present_val
= BIT(IEEE80211_RADIOTAP_FLAGS
) |
157 BIT(IEEE80211_RADIOTAP_CHANNEL
) |
158 BIT(IEEE80211_RADIOTAP_RX_FLAGS
);
161 it_present_val
|= BIT(IEEE80211_RADIOTAP_ANTENNA
);
163 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
165 BIT(IEEE80211_RADIOTAP_EXT
) |
166 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE
);
167 put_unaligned_le32(it_present_val
, it_present
);
169 it_present_val
= BIT(IEEE80211_RADIOTAP_ANTENNA
) |
170 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
173 put_unaligned_le32(it_present_val
, it_present
);
175 pos
= (void *)(it_present
+ 1);
177 /* the order of the following fields is important */
179 /* IEEE80211_RADIOTAP_TSFT */
180 if (ieee80211_have_rx_timestamp(status
)) {
182 while ((pos
- (u8
*)rthdr
) & 7)
185 ieee80211_calculate_rx_timestamp(local
, status
,
188 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
192 /* IEEE80211_RADIOTAP_FLAGS */
193 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
194 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
195 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
196 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
197 if (status
->flag
& RX_FLAG_SHORTPRE
)
198 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
201 /* IEEE80211_RADIOTAP_RATE */
202 if (!rate
|| status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
)) {
204 * Without rate information don't add it. If we have,
205 * MCS information is a separate field in radiotap,
206 * added below. The byte here is needed as padding
207 * for the channel though, so initialise it to 0.
212 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
213 if (status
->flag
& RX_FLAG_10MHZ
)
215 else if (status
->flag
& RX_FLAG_5MHZ
)
217 *pos
= DIV_ROUND_UP(rate
->bitrate
, 5 * (1 << shift
));
221 /* IEEE80211_RADIOTAP_CHANNEL */
222 put_unaligned_le16(status
->freq
, pos
);
224 if (status
->flag
& RX_FLAG_10MHZ
)
225 channel_flags
|= IEEE80211_CHAN_HALF
;
226 else if (status
->flag
& RX_FLAG_5MHZ
)
227 channel_flags
|= IEEE80211_CHAN_QUARTER
;
229 if (status
->band
== IEEE80211_BAND_5GHZ
)
230 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
;
231 else if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
232 channel_flags
|= IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
;
233 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
234 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
236 channel_flags
|= IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
;
238 channel_flags
|= IEEE80211_CHAN_2GHZ
;
239 put_unaligned_le16(channel_flags
, pos
);
242 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
243 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
244 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
245 *pos
= status
->signal
;
247 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
251 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
253 if (!status
->chains
) {
254 /* IEEE80211_RADIOTAP_ANTENNA */
255 *pos
= status
->antenna
;
259 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
261 /* IEEE80211_RADIOTAP_RX_FLAGS */
262 /* ensure 2 byte alignment for the 2 byte field as required */
263 if ((pos
- (u8
*)rthdr
) & 1)
265 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
266 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
267 put_unaligned_le16(rx_flags
, pos
);
270 if (status
->flag
& RX_FLAG_HT
) {
273 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
274 *pos
++ = local
->hw
.radiotap_mcs_details
;
276 if (status
->flag
& RX_FLAG_SHORT_GI
)
277 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
278 if (status
->flag
& RX_FLAG_40MHZ
)
279 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
280 if (status
->flag
& RX_FLAG_HT_GF
)
281 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
282 if (status
->flag
& RX_FLAG_LDPC
)
283 *pos
|= IEEE80211_RADIOTAP_MCS_FEC_LDPC
;
284 stbc
= (status
->flag
& RX_FLAG_STBC_MASK
) >> RX_FLAG_STBC_SHIFT
;
285 *pos
|= stbc
<< IEEE80211_RADIOTAP_MCS_STBC_SHIFT
;
287 *pos
++ = status
->rate_idx
;
290 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
293 /* ensure 4 byte alignment */
294 while ((pos
- (u8
*)rthdr
) & 3)
297 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
298 put_unaligned_le32(status
->ampdu_reference
, pos
);
300 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
301 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
302 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
303 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
304 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
305 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
306 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
307 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
308 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
309 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
310 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
311 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
312 put_unaligned_le16(flags
, pos
);
314 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
315 *pos
++ = status
->ampdu_delimiter_crc
;
321 if (status
->flag
& RX_FLAG_VHT
) {
322 u16 known
= local
->hw
.radiotap_vht_details
;
324 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT
);
325 /* known field - how to handle 80+80? */
326 if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
327 known
&= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH
;
328 put_unaligned_le16(known
, pos
);
331 if (status
->flag
& RX_FLAG_SHORT_GI
)
332 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_SGI
;
333 /* in VHT, STBC is binary */
334 if (status
->flag
& RX_FLAG_STBC_MASK
)
335 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_STBC
;
336 if (status
->vht_flag
& RX_VHT_FLAG_BF
)
337 *pos
|= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED
;
340 if (status
->vht_flag
& RX_VHT_FLAG_80MHZ
)
342 else if (status
->vht_flag
& RX_VHT_FLAG_80P80MHZ
)
343 *pos
++ = 0; /* marked not known above */
344 else if (status
->vht_flag
& RX_VHT_FLAG_160MHZ
)
346 else if (status
->flag
& RX_FLAG_40MHZ
)
351 *pos
= (status
->rate_idx
<< 4) | status
->vht_nss
;
354 if (status
->flag
& RX_FLAG_LDPC
)
355 *pos
|= IEEE80211_RADIOTAP_CODING_LDPC_USER0
;
363 for_each_set_bit(chain
, &chains
, IEEE80211_MAX_CHAINS
) {
364 *pos
++ = status
->chain_signal
[chain
];
370 * This function copies a received frame to all monitor interfaces and
371 * returns a cleaned-up SKB that no longer includes the FCS nor the
372 * radiotap header the driver might have added.
374 static struct sk_buff
*
375 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
376 struct ieee80211_rate
*rate
)
378 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
379 struct ieee80211_sub_if_data
*sdata
;
381 struct sk_buff
*skb
, *skb2
;
382 struct net_device
*prev_dev
= NULL
;
383 int present_fcs_len
= 0;
386 * First, we may need to make a copy of the skb because
387 * (1) we need to modify it for radiotap (if not present), and
388 * (2) the other RX handlers will modify the skb we got.
390 * We don't need to, of course, if we aren't going to return
391 * the SKB because it has a bad FCS/PLCP checksum.
394 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
395 present_fcs_len
= FCS_LEN
;
397 /* ensure hdr->frame_control is in skb head */
398 if (!pskb_may_pull(origskb
, 2)) {
399 dev_kfree_skb(origskb
);
403 if (!local
->monitors
) {
404 if (should_drop_frame(origskb
, present_fcs_len
)) {
405 dev_kfree_skb(origskb
);
409 return remove_monitor_info(local
, origskb
);
412 /* room for the radiotap header based on driver features */
413 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
415 if (should_drop_frame(origskb
, present_fcs_len
)) {
416 /* only need to expand headroom if necessary */
421 * This shouldn't trigger often because most devices have an
422 * RX header they pull before we get here, and that should
423 * be big enough for our radiotap information. We should
424 * probably export the length to drivers so that we can have
425 * them allocate enough headroom to start with.
427 if (skb_headroom(skb
) < needed_headroom
&&
428 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
434 * Need to make a copy and possibly remove radiotap header
435 * and FCS from the original.
437 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
439 origskb
= remove_monitor_info(local
, origskb
);
445 /* prepend radiotap information */
446 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
449 skb_reset_mac_header(skb
);
450 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
451 skb
->pkt_type
= PACKET_OTHERHOST
;
452 skb
->protocol
= htons(ETH_P_802_2
);
454 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
455 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
458 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
461 if (!ieee80211_sdata_running(sdata
))
465 skb2
= skb_clone(skb
, GFP_ATOMIC
);
467 skb2
->dev
= prev_dev
;
468 netif_receive_skb(skb2
);
472 prev_dev
= sdata
->dev
;
473 sdata
->dev
->stats
.rx_packets
++;
474 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
479 netif_receive_skb(skb
);
486 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
488 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
489 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
490 int tid
, seqno_idx
, security_idx
;
492 /* does the frame have a qos control field? */
493 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
494 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
495 /* frame has qos control */
496 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
497 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
498 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
504 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
506 * Sequence numbers for management frames, QoS data
507 * frames with a broadcast/multicast address in the
508 * Address 1 field, and all non-QoS data frames sent
509 * by QoS STAs are assigned using an additional single
510 * modulo-4096 counter, [...]
512 * We also use that counter for non-QoS STAs.
514 seqno_idx
= IEEE80211_NUM_TIDS
;
516 if (ieee80211_is_mgmt(hdr
->frame_control
))
517 security_idx
= IEEE80211_NUM_TIDS
;
521 rx
->seqno_idx
= seqno_idx
;
522 rx
->security_idx
= security_idx
;
523 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
524 * For now, set skb->priority to 0 for other cases. */
525 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
529 * DOC: Packet alignment
531 * Drivers always need to pass packets that are aligned to two-byte boundaries
534 * Additionally, should, if possible, align the payload data in a way that
535 * guarantees that the contained IP header is aligned to a four-byte
536 * boundary. In the case of regular frames, this simply means aligning the
537 * payload to a four-byte boundary (because either the IP header is directly
538 * contained, or IV/RFC1042 headers that have a length divisible by four are
539 * in front of it). If the payload data is not properly aligned and the
540 * architecture doesn't support efficient unaligned operations, mac80211
541 * will align the data.
543 * With A-MSDU frames, however, the payload data address must yield two modulo
544 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
545 * push the IP header further back to a multiple of four again. Thankfully, the
546 * specs were sane enough this time around to require padding each A-MSDU
547 * subframe to a length that is a multiple of four.
549 * Padding like Atheros hardware adds which is between the 802.11 header and
550 * the payload is not supported, the driver is required to move the 802.11
551 * header to be directly in front of the payload in that case.
553 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
555 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
556 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
557 "unaligned packet at 0x%p\n", rx
->skb
->data
);
564 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
566 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
568 if (is_multicast_ether_addr(hdr
->addr1
))
571 return ieee80211_is_robust_mgmt_frame(skb
);
575 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
577 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
579 if (!is_multicast_ether_addr(hdr
->addr1
))
582 return ieee80211_is_robust_mgmt_frame(skb
);
586 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
587 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
589 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
590 struct ieee80211_mmie
*mmie
;
592 if (skb
->len
< 24 + sizeof(*mmie
) || !is_multicast_ether_addr(hdr
->da
))
595 if (!ieee80211_is_robust_mgmt_frame(skb
))
596 return -1; /* not a robust management frame */
598 mmie
= (struct ieee80211_mmie
*)
599 (skb
->data
+ skb
->len
- sizeof(*mmie
));
600 if (mmie
->element_id
!= WLAN_EID_MMIE
||
601 mmie
->length
!= sizeof(*mmie
) - 2)
604 return le16_to_cpu(mmie
->key_id
);
607 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme
*cs
,
610 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
615 fc
= hdr
->frame_control
;
616 hdrlen
= ieee80211_hdrlen(fc
);
618 if (skb
->len
< hdrlen
+ cs
->hdr_len
)
621 skb_copy_bits(skb
, hdrlen
+ cs
->key_idx_off
, &keyid
, 1);
622 keyid
&= cs
->key_idx_mask
;
623 keyid
>>= cs
->key_idx_shift
;
628 static ieee80211_rx_result
ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
630 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
631 char *dev_addr
= rx
->sdata
->vif
.addr
;
633 if (ieee80211_is_data(hdr
->frame_control
)) {
634 if (is_multicast_ether_addr(hdr
->addr1
)) {
635 if (ieee80211_has_tods(hdr
->frame_control
) ||
636 !ieee80211_has_fromds(hdr
->frame_control
))
637 return RX_DROP_MONITOR
;
638 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
639 return RX_DROP_MONITOR
;
641 if (!ieee80211_has_a4(hdr
->frame_control
))
642 return RX_DROP_MONITOR
;
643 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
644 return RX_DROP_MONITOR
;
648 /* If there is not an established peer link and this is not a peer link
649 * establisment frame, beacon or probe, drop the frame.
652 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
653 struct ieee80211_mgmt
*mgmt
;
655 if (!ieee80211_is_mgmt(hdr
->frame_control
))
656 return RX_DROP_MONITOR
;
658 if (ieee80211_is_action(hdr
->frame_control
)) {
661 /* make sure category field is present */
662 if (rx
->skb
->len
< IEEE80211_MIN_ACTION_SIZE
)
663 return RX_DROP_MONITOR
;
665 mgmt
= (struct ieee80211_mgmt
*)hdr
;
666 category
= mgmt
->u
.action
.category
;
667 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
668 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
669 return RX_DROP_MONITOR
;
673 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
674 ieee80211_is_probe_resp(hdr
->frame_control
) ||
675 ieee80211_is_beacon(hdr
->frame_control
) ||
676 ieee80211_is_auth(hdr
->frame_control
))
679 return RX_DROP_MONITOR
;
685 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
686 struct tid_ampdu_rx
*tid_agg_rx
,
688 struct sk_buff_head
*frames
)
690 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
691 struct ieee80211_rx_status
*status
;
693 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
698 /* release the frame from the reorder ring buffer */
699 tid_agg_rx
->stored_mpdu_num
--;
700 tid_agg_rx
->reorder_buf
[index
] = NULL
;
701 status
= IEEE80211_SKB_RXCB(skb
);
702 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
703 __skb_queue_tail(frames
, skb
);
706 tid_agg_rx
->head_seq_num
= ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
709 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
710 struct tid_ampdu_rx
*tid_agg_rx
,
712 struct sk_buff_head
*frames
)
716 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
718 while (ieee80211_sn_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
719 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
720 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
726 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
727 * the skb was added to the buffer longer than this time ago, the earlier
728 * frames that have not yet been received are assumed to be lost and the skb
729 * can be released for processing. This may also release other skb's from the
730 * reorder buffer if there are no additional gaps between the frames.
732 * Callers must hold tid_agg_rx->reorder_lock.
734 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
736 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
737 struct tid_ampdu_rx
*tid_agg_rx
,
738 struct sk_buff_head
*frames
)
742 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
744 /* release the buffer until next missing frame */
745 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
746 if (!tid_agg_rx
->reorder_buf
[index
] &&
747 tid_agg_rx
->stored_mpdu_num
) {
749 * No buffers ready to be released, but check whether any
750 * frames in the reorder buffer have timed out.
753 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
754 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
755 if (!tid_agg_rx
->reorder_buf
[j
]) {
760 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
761 HT_RX_REORDER_BUF_TIMEOUT
))
762 goto set_release_timer
;
764 ht_dbg_ratelimited(sdata
,
765 "release an RX reorder frame due to timeout on earlier frames\n");
766 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
,
770 * Increment the head seq# also for the skipped slots.
772 tid_agg_rx
->head_seq_num
=
773 (tid_agg_rx
->head_seq_num
+
774 skipped
) & IEEE80211_SN_MASK
;
777 } else while (tid_agg_rx
->reorder_buf
[index
]) {
778 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
,
780 index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
783 if (tid_agg_rx
->stored_mpdu_num
) {
784 j
= index
= tid_agg_rx
->head_seq_num
% tid_agg_rx
->buf_size
;
786 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
787 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
788 if (tid_agg_rx
->reorder_buf
[j
])
794 mod_timer(&tid_agg_rx
->reorder_timer
,
795 tid_agg_rx
->reorder_time
[j
] + 1 +
796 HT_RX_REORDER_BUF_TIMEOUT
);
798 del_timer(&tid_agg_rx
->reorder_timer
);
803 * As this function belongs to the RX path it must be under
804 * rcu_read_lock protection. It returns false if the frame
805 * can be processed immediately, true if it was consumed.
807 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
808 struct tid_ampdu_rx
*tid_agg_rx
,
810 struct sk_buff_head
*frames
)
812 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
813 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
814 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
815 u16 head_seq_num
, buf_size
;
819 spin_lock(&tid_agg_rx
->reorder_lock
);
821 buf_size
= tid_agg_rx
->buf_size
;
822 head_seq_num
= tid_agg_rx
->head_seq_num
;
824 /* frame with out of date sequence number */
825 if (ieee80211_sn_less(mpdu_seq_num
, head_seq_num
)) {
831 * If frame the sequence number exceeds our buffering window
832 * size release some previous frames to make room for this one.
834 if (!ieee80211_sn_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
835 head_seq_num
= ieee80211_sn_inc(
836 ieee80211_sn_sub(mpdu_seq_num
, buf_size
));
837 /* release stored frames up to new head to stack */
838 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
839 head_seq_num
, frames
);
842 /* Now the new frame is always in the range of the reordering buffer */
844 index
= mpdu_seq_num
% tid_agg_rx
->buf_size
;
846 /* check if we already stored this frame */
847 if (tid_agg_rx
->reorder_buf
[index
]) {
853 * If the current MPDU is in the right order and nothing else
854 * is stored we can process it directly, no need to buffer it.
855 * If it is first but there's something stored, we may be able
856 * to release frames after this one.
858 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
859 tid_agg_rx
->stored_mpdu_num
== 0) {
860 tid_agg_rx
->head_seq_num
=
861 ieee80211_sn_inc(tid_agg_rx
->head_seq_num
);
866 /* put the frame in the reordering buffer */
867 tid_agg_rx
->reorder_buf
[index
] = skb
;
868 tid_agg_rx
->reorder_time
[index
] = jiffies
;
869 tid_agg_rx
->stored_mpdu_num
++;
870 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
, frames
);
873 spin_unlock(&tid_agg_rx
->reorder_lock
);
878 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
879 * true if the MPDU was buffered, false if it should be processed.
881 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
882 struct sk_buff_head
*frames
)
884 struct sk_buff
*skb
= rx
->skb
;
885 struct ieee80211_local
*local
= rx
->local
;
886 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
887 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
888 struct sta_info
*sta
= rx
->sta
;
889 struct tid_ampdu_rx
*tid_agg_rx
;
893 if (!ieee80211_is_data_qos(hdr
->frame_control
) ||
894 is_multicast_ether_addr(hdr
->addr1
))
898 * filter the QoS data rx stream according to
899 * STA/TID and check if this STA/TID is on aggregation
905 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
906 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
907 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
909 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
913 /* qos null data frames are excluded */
914 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
917 /* not part of a BA session */
918 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
919 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
922 /* not actually part of this BA session */
923 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
926 /* new, potentially un-ordered, ampdu frame - process it */
928 /* reset session timer */
929 if (tid_agg_rx
->timeout
)
930 tid_agg_rx
->last_rx
= jiffies
;
932 /* if this mpdu is fragmented - terminate rx aggregation session */
933 sc
= le16_to_cpu(hdr
->seq_ctrl
);
934 if (sc
& IEEE80211_SCTL_FRAG
) {
935 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
936 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
937 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
942 * No locking needed -- we will only ever process one
943 * RX packet at a time, and thus own tid_agg_rx. All
944 * other code manipulating it needs to (and does) make
945 * sure that we cannot get to it any more before doing
948 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
,
953 __skb_queue_tail(frames
, skb
);
956 static ieee80211_rx_result debug_noinline
957 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
959 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
960 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
963 * Drop duplicate 802.11 retransmissions
964 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
966 if (rx
->skb
->len
>= 24 && rx
->sta
&&
967 !ieee80211_is_ctl(hdr
->frame_control
) &&
968 !ieee80211_is_qos_nullfunc(hdr
->frame_control
) &&
969 !is_multicast_ether_addr(hdr
->addr1
)) {
970 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
971 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
973 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
974 rx
->local
->dot11FrameDuplicateCount
++;
975 rx
->sta
->num_duplicates
++;
977 return RX_DROP_UNUSABLE
;
978 } else if (!(status
->flag
& RX_FLAG_AMSDU_MORE
)) {
979 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
983 if (unlikely(rx
->skb
->len
< 16)) {
984 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
985 return RX_DROP_MONITOR
;
988 /* Drop disallowed frame classes based on STA auth/assoc state;
989 * IEEE 802.11, Chap 5.5.
991 * mac80211 filters only based on association state, i.e. it drops
992 * Class 3 frames from not associated stations. hostapd sends
993 * deauth/disassoc frames when needed. In addition, hostapd is
994 * responsible for filtering on both auth and assoc states.
997 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
998 return ieee80211_rx_mesh_check(rx
);
1000 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
1001 ieee80211_is_pspoll(hdr
->frame_control
)) &&
1002 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
1003 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1004 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
1006 * accept port control frames from the AP even when it's not
1007 * yet marked ASSOC to prevent a race where we don't set the
1008 * assoc bit quickly enough before it sends the first frame
1010 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1011 ieee80211_is_data_present(hdr
->frame_control
)) {
1012 unsigned int hdrlen
;
1015 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1017 if (rx
->skb
->len
< hdrlen
+ 8)
1018 return RX_DROP_MONITOR
;
1020 skb_copy_bits(rx
->skb
, hdrlen
+ 6, ðertype
, 2);
1021 if (ethertype
== rx
->sdata
->control_port_protocol
)
1025 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
1026 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
1029 return RX_DROP_UNUSABLE
;
1031 return RX_DROP_MONITOR
;
1038 static ieee80211_rx_result debug_noinline
1039 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1041 struct ieee80211_local
*local
;
1042 struct ieee80211_hdr
*hdr
;
1043 struct sk_buff
*skb
;
1047 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1049 if (!local
->pspolling
)
1052 if (!ieee80211_has_fromds(hdr
->frame_control
))
1053 /* this is not from AP */
1056 if (!ieee80211_is_data(hdr
->frame_control
))
1059 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1060 /* AP has no more frames buffered for us */
1061 local
->pspolling
= false;
1065 /* more data bit is set, let's request a new frame from the AP */
1066 ieee80211_send_pspoll(local
, rx
->sdata
);
1071 static void sta_ps_start(struct sta_info
*sta
)
1073 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1074 struct ieee80211_local
*local
= sdata
->local
;
1077 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1078 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1079 ps
= &sdata
->bss
->ps
;
1083 atomic_inc(&ps
->num_sta_ps
);
1084 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1085 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1086 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1087 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1088 sta
->sta
.addr
, sta
->sta
.aid
);
1091 static void sta_ps_end(struct sta_info
*sta
)
1093 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1094 sta
->sta
.addr
, sta
->sta
.aid
);
1096 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1098 * Clear the flag only if the other one is still set
1099 * so that the TX path won't start TX'ing new frames
1100 * directly ... In the case that the driver flag isn't
1101 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1103 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1104 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1105 sta
->sta
.addr
, sta
->sta
.aid
);
1109 ieee80211_sta_ps_deliver_wakeup(sta
);
1112 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1114 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1117 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1119 /* Don't let the same PS state be set twice */
1120 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1121 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1125 sta_ps_start(sta_inf
);
1127 sta_ps_end(sta_inf
);
1131 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1133 static ieee80211_rx_result debug_noinline
1134 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1136 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1137 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1138 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1141 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1144 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1145 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1149 * The device handles station powersave, so don't do anything about
1150 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1151 * it to mac80211 since they're handled.)
1153 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1157 * Don't do anything if the station isn't already asleep. In
1158 * the uAPSD case, the station will probably be marked asleep,
1159 * in the PS-Poll case the station must be confused ...
1161 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1164 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1165 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1166 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1167 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1169 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1172 /* Free PS Poll skb here instead of returning RX_DROP that would
1173 * count as an dropped frame. */
1174 dev_kfree_skb(rx
->skb
);
1177 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1178 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1179 ieee80211_has_pm(hdr
->frame_control
) &&
1180 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1181 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1182 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1183 ac
= ieee802_1d_to_ac
[tid
& 7];
1186 * If this AC is not trigger-enabled do nothing.
1188 * NB: This could/should check a separate bitmap of trigger-
1189 * enabled queues, but for now we only implement uAPSD w/o
1190 * TSPEC changes to the ACs, so they're always the same.
1192 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1195 /* if we are in a service period, do nothing */
1196 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1199 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1200 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1202 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1208 static ieee80211_rx_result debug_noinline
1209 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1211 struct sta_info
*sta
= rx
->sta
;
1212 struct sk_buff
*skb
= rx
->skb
;
1213 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1214 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1221 * Update last_rx only for IBSS packets which are for the current
1222 * BSSID and for station already AUTHORIZED to avoid keeping the
1223 * current IBSS network alive in cases where other STAs start
1224 * using different BSSID. This will also give the station another
1225 * chance to restart the authentication/authorization in case
1226 * something went wrong the first time.
1228 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1229 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1230 NL80211_IFTYPE_ADHOC
);
1231 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
) &&
1232 test_sta_flag(sta
, WLAN_STA_AUTHORIZED
)) {
1233 sta
->last_rx
= jiffies
;
1234 if (ieee80211_is_data(hdr
->frame_control
) &&
1235 !is_multicast_ether_addr(hdr
->addr1
)) {
1236 sta
->last_rx_rate_idx
= status
->rate_idx
;
1237 sta
->last_rx_rate_flag
= status
->flag
;
1238 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1239 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1242 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1244 * Mesh beacons will update last_rx when if they are found to
1245 * match the current local configuration when processed.
1247 sta
->last_rx
= jiffies
;
1248 if (ieee80211_is_data(hdr
->frame_control
)) {
1249 sta
->last_rx_rate_idx
= status
->rate_idx
;
1250 sta
->last_rx_rate_flag
= status
->flag
;
1251 sta
->last_rx_rate_vht_flag
= status
->vht_flag
;
1252 sta
->last_rx_rate_vht_nss
= status
->vht_nss
;
1256 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1259 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1260 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1262 sta
->rx_fragments
++;
1263 sta
->rx_bytes
+= rx
->skb
->len
;
1264 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1265 sta
->last_signal
= status
->signal
;
1266 ewma_add(&sta
->avg_signal
, -status
->signal
);
1269 if (status
->chains
) {
1270 sta
->chains
= status
->chains
;
1271 for (i
= 0; i
< ARRAY_SIZE(status
->chain_signal
); i
++) {
1272 int signal
= status
->chain_signal
[i
];
1274 if (!(status
->chains
& BIT(i
)))
1277 sta
->chain_signal_last
[i
] = signal
;
1278 ewma_add(&sta
->chain_signal_avg
[i
], -signal
);
1283 * Change STA power saving mode only at the end of a frame
1284 * exchange sequence.
1286 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1287 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1288 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1289 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1290 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1291 /* PM bit is only checked in frames where it isn't reserved,
1292 * in AP mode it's reserved in non-bufferable management frames
1293 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1295 (!ieee80211_is_mgmt(hdr
->frame_control
) ||
1296 ieee80211_is_bufferable_mmpdu(hdr
->frame_control
))) {
1297 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1298 if (!ieee80211_has_pm(hdr
->frame_control
))
1301 if (ieee80211_has_pm(hdr
->frame_control
))
1306 /* mesh power save support */
1307 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
1308 ieee80211_mps_rx_h_sta_process(sta
, hdr
);
1311 * Drop (qos-)data::nullfunc frames silently, since they
1312 * are used only to control station power saving mode.
1314 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1315 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1316 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1319 * If we receive a 4-addr nullfunc frame from a STA
1320 * that was not moved to a 4-addr STA vlan yet send
1321 * the event to userspace and for older hostapd drop
1322 * the frame to the monitor interface.
1324 if (ieee80211_has_a4(hdr
->frame_control
) &&
1325 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1326 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1327 !rx
->sdata
->u
.vlan
.sta
))) {
1328 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1329 cfg80211_rx_unexpected_4addr_frame(
1330 rx
->sdata
->dev
, sta
->sta
.addr
,
1332 return RX_DROP_MONITOR
;
1335 * Update counter and free packet here to avoid
1336 * counting this as a dropped packed.
1339 dev_kfree_skb(rx
->skb
);
1344 } /* ieee80211_rx_h_sta_process */
1346 static ieee80211_rx_result debug_noinline
1347 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
1349 struct sk_buff
*skb
= rx
->skb
;
1350 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1351 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1354 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
1355 struct ieee80211_key
*sta_ptk
= NULL
;
1356 int mmie_keyidx
= -1;
1358 const struct ieee80211_cipher_scheme
*cs
= NULL
;
1363 * There are four types of keys:
1364 * - GTK (group keys)
1365 * - IGTK (group keys for management frames)
1366 * - PTK (pairwise keys)
1367 * - STK (station-to-station pairwise keys)
1369 * When selecting a key, we have to distinguish between multicast
1370 * (including broadcast) and unicast frames, the latter can only
1371 * use PTKs and STKs while the former always use GTKs and IGTKs.
1372 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1373 * unicast frames can also use key indices like GTKs. Hence, if we
1374 * don't have a PTK/STK we check the key index for a WEP key.
1376 * Note that in a regular BSS, multicast frames are sent by the
1377 * AP only, associated stations unicast the frame to the AP first
1378 * which then multicasts it on their behalf.
1380 * There is also a slight problem in IBSS mode: GTKs are negotiated
1381 * with each station, that is something we don't currently handle.
1382 * The spec seems to expect that one negotiates the same key with
1383 * every station but there's no such requirement; VLANs could be
1388 * No point in finding a key and decrypting if the frame is neither
1389 * addressed to us nor a multicast frame.
1391 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1394 /* start without a key */
1396 fc
= hdr
->frame_control
;
1399 int keyid
= rx
->sta
->ptk_idx
;
1401 if (ieee80211_has_protected(fc
) && rx
->sta
->cipher_scheme
) {
1402 cs
= rx
->sta
->cipher_scheme
;
1403 keyid
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1404 if (unlikely(keyid
< 0))
1405 return RX_DROP_UNUSABLE
;
1407 sta_ptk
= rcu_dereference(rx
->sta
->ptk
[keyid
]);
1410 if (!ieee80211_has_protected(fc
))
1411 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
1413 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
1415 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1416 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1418 /* Skip decryption if the frame is not protected. */
1419 if (!ieee80211_has_protected(fc
))
1421 } else if (mmie_keyidx
>= 0) {
1422 /* Broadcast/multicast robust management frame / BIP */
1423 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1424 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1427 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
1428 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
1429 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
1431 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
1433 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
1434 } else if (!ieee80211_has_protected(fc
)) {
1436 * The frame was not protected, so skip decryption. However, we
1437 * need to set rx->key if there is a key that could have been
1438 * used so that the frame may be dropped if encryption would
1439 * have been expected.
1441 struct ieee80211_key
*key
= NULL
;
1442 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1445 if (ieee80211_is_mgmt(fc
) &&
1446 is_multicast_ether_addr(hdr
->addr1
) &&
1447 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1451 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1452 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1458 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1459 key
= rcu_dereference(sdata
->keys
[i
]);
1472 * The device doesn't give us the IV so we won't be
1473 * able to look up the key. That's ok though, we
1474 * don't need to decrypt the frame, we just won't
1475 * be able to keep statistics accurate.
1476 * Except for key threshold notifications, should
1477 * we somehow allow the driver to tell us which key
1478 * the hardware used if this flag is set?
1480 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1481 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1484 hdrlen
= ieee80211_hdrlen(fc
);
1487 keyidx
= iwl80211_get_cs_keyid(cs
, rx
->skb
);
1489 if (unlikely(keyidx
< 0))
1490 return RX_DROP_UNUSABLE
;
1492 if (rx
->skb
->len
< 8 + hdrlen
)
1493 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1495 * no need to call ieee80211_wep_get_keyidx,
1496 * it verifies a bunch of things we've done already
1498 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1499 keyidx
= keyid
>> 6;
1502 /* check per-station GTK first, if multicast packet */
1503 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1504 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1506 /* if not found, try default key */
1508 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1511 * RSNA-protected unicast frames should always be
1512 * sent with pairwise or station-to-station keys,
1513 * but for WEP we allow using a key index as well.
1516 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1517 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1518 !is_multicast_ether_addr(hdr
->addr1
))
1524 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1525 return RX_DROP_MONITOR
;
1527 rx
->key
->tx_rx_count
++;
1528 /* TODO: add threshold stuff again */
1530 return RX_DROP_MONITOR
;
1533 switch (rx
->key
->conf
.cipher
) {
1534 case WLAN_CIPHER_SUITE_WEP40
:
1535 case WLAN_CIPHER_SUITE_WEP104
:
1536 result
= ieee80211_crypto_wep_decrypt(rx
);
1538 case WLAN_CIPHER_SUITE_TKIP
:
1539 result
= ieee80211_crypto_tkip_decrypt(rx
);
1541 case WLAN_CIPHER_SUITE_CCMP
:
1542 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1544 case WLAN_CIPHER_SUITE_AES_CMAC
:
1545 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1548 result
= ieee80211_crypto_hw_decrypt(rx
);
1551 /* the hdr variable is invalid after the decrypt handlers */
1553 /* either the frame has been decrypted or will be dropped */
1554 status
->flag
|= RX_FLAG_DECRYPTED
;
1559 static inline struct ieee80211_fragment_entry
*
1560 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1561 unsigned int frag
, unsigned int seq
, int rx_queue
,
1562 struct sk_buff
**skb
)
1564 struct ieee80211_fragment_entry
*entry
;
1566 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1567 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1568 sdata
->fragment_next
= 0;
1570 if (!skb_queue_empty(&entry
->skb_list
))
1571 __skb_queue_purge(&entry
->skb_list
);
1573 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1575 entry
->first_frag_time
= jiffies
;
1577 entry
->rx_queue
= rx_queue
;
1578 entry
->last_frag
= frag
;
1580 entry
->extra_len
= 0;
1585 static inline struct ieee80211_fragment_entry
*
1586 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1587 unsigned int frag
, unsigned int seq
,
1588 int rx_queue
, struct ieee80211_hdr
*hdr
)
1590 struct ieee80211_fragment_entry
*entry
;
1593 idx
= sdata
->fragment_next
;
1594 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1595 struct ieee80211_hdr
*f_hdr
;
1599 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1601 entry
= &sdata
->fragments
[idx
];
1602 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1603 entry
->rx_queue
!= rx_queue
||
1604 entry
->last_frag
+ 1 != frag
)
1607 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1610 * Check ftype and addresses are equal, else check next fragment
1612 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1613 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1614 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1615 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1618 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1619 __skb_queue_purge(&entry
->skb_list
);
1628 static ieee80211_rx_result debug_noinline
1629 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1631 struct ieee80211_hdr
*hdr
;
1634 unsigned int frag
, seq
;
1635 struct ieee80211_fragment_entry
*entry
;
1636 struct sk_buff
*skb
;
1637 struct ieee80211_rx_status
*status
;
1639 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1640 fc
= hdr
->frame_control
;
1642 if (ieee80211_is_ctl(fc
))
1645 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1646 frag
= sc
& IEEE80211_SCTL_FRAG
;
1648 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1649 is_multicast_ether_addr(hdr
->addr1
))) {
1650 /* not fragmented */
1653 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1655 if (skb_linearize(rx
->skb
))
1656 return RX_DROP_UNUSABLE
;
1659 * skb_linearize() might change the skb->data and
1660 * previously cached variables (in this case, hdr) need to
1661 * be refreshed with the new data.
1663 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1664 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1667 /* This is the first fragment of a new frame. */
1668 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1669 rx
->seqno_idx
, &(rx
->skb
));
1670 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1671 ieee80211_has_protected(fc
)) {
1672 int queue
= rx
->security_idx
;
1673 /* Store CCMP PN so that we can verify that the next
1674 * fragment has a sequential PN value. */
1676 memcpy(entry
->last_pn
,
1677 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1678 IEEE80211_CCMP_PN_LEN
);
1683 /* This is a fragment for a frame that should already be pending in
1684 * fragment cache. Add this fragment to the end of the pending entry.
1686 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1687 rx
->seqno_idx
, hdr
);
1689 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1690 return RX_DROP_MONITOR
;
1693 /* Verify that MPDUs within one MSDU have sequential PN values.
1694 * (IEEE 802.11i, 8.3.3.4.5) */
1697 u8 pn
[IEEE80211_CCMP_PN_LEN
], *rpn
;
1699 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1700 return RX_DROP_UNUSABLE
;
1701 memcpy(pn
, entry
->last_pn
, IEEE80211_CCMP_PN_LEN
);
1702 for (i
= IEEE80211_CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1707 queue
= rx
->security_idx
;
1708 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1709 if (memcmp(pn
, rpn
, IEEE80211_CCMP_PN_LEN
))
1710 return RX_DROP_UNUSABLE
;
1711 memcpy(entry
->last_pn
, pn
, IEEE80211_CCMP_PN_LEN
);
1714 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1715 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1716 entry
->last_frag
= frag
;
1717 entry
->extra_len
+= rx
->skb
->len
;
1718 if (ieee80211_has_morefrags(fc
)) {
1723 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1724 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1725 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1726 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1728 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1729 __skb_queue_purge(&entry
->skb_list
);
1730 return RX_DROP_UNUSABLE
;
1733 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1734 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1738 /* Complete frame has been reassembled - process it now */
1739 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1740 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1744 rx
->sta
->rx_packets
++;
1745 if (is_multicast_ether_addr(hdr
->addr1
))
1746 rx
->local
->dot11MulticastReceivedFrameCount
++;
1748 ieee80211_led_rx(rx
->local
);
1752 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1754 if (unlikely(!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1760 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1762 struct sk_buff
*skb
= rx
->skb
;
1763 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1766 * Pass through unencrypted frames if the hardware has
1767 * decrypted them already.
1769 if (status
->flag
& RX_FLAG_DECRYPTED
)
1772 /* Drop unencrypted frames if key is set. */
1773 if (unlikely(!ieee80211_has_protected(fc
) &&
1774 !ieee80211_is_nullfunc(fc
) &&
1775 ieee80211_is_data(fc
) &&
1776 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1782 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1784 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1785 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1786 __le16 fc
= hdr
->frame_control
;
1789 * Pass through unencrypted frames if the hardware has
1790 * decrypted them already.
1792 if (status
->flag
& RX_FLAG_DECRYPTED
)
1795 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1796 if (unlikely(!ieee80211_has_protected(fc
) &&
1797 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1799 if (ieee80211_is_deauth(fc
) ||
1800 ieee80211_is_disassoc(fc
))
1801 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1806 /* BIP does not use Protected field, so need to check MMIE */
1807 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1808 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1809 if (ieee80211_is_deauth(fc
) ||
1810 ieee80211_is_disassoc(fc
))
1811 cfg80211_rx_unprot_mlme_mgmt(rx
->sdata
->dev
,
1817 * When using MFP, Action frames are not allowed prior to
1818 * having configured keys.
1820 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1821 ieee80211_is_robust_mgmt_frame(rx
->skb
)))
1829 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1831 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1832 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1833 bool check_port_control
= false;
1834 struct ethhdr
*ehdr
;
1837 *port_control
= false;
1838 if (ieee80211_has_a4(hdr
->frame_control
) &&
1839 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1842 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1843 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1845 if (!sdata
->u
.mgd
.use_4addr
)
1848 check_port_control
= true;
1851 if (is_multicast_ether_addr(hdr
->addr1
) &&
1852 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1855 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1859 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1860 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1861 *port_control
= true;
1862 else if (check_port_control
)
1869 * requires that rx->skb is a frame with ethernet header
1871 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1873 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1874 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1875 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1878 * Allow EAPOL frames to us/the PAE group address regardless
1879 * of whether the frame was encrypted or not.
1881 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1882 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1883 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1886 if (ieee80211_802_1x_port_control(rx
) ||
1887 ieee80211_drop_unencrypted(rx
, fc
))
1894 * requires that rx->skb is a frame with ethernet header
1897 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1899 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1900 struct net_device
*dev
= sdata
->dev
;
1901 struct sk_buff
*skb
, *xmit_skb
;
1902 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1903 struct sta_info
*dsta
;
1904 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1909 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1910 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1911 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1912 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1913 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1914 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1916 * send multicast frames both to higher layers in
1917 * local net stack and back to the wireless medium
1919 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1921 net_info_ratelimited("%s: failed to clone multicast frame\n",
1924 dsta
= sta_info_get(sdata
, skb
->data
);
1927 * The destination station is associated to
1928 * this AP (in this VLAN), so send the frame
1929 * directly to it and do not pass it to local
1938 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1940 /* 'align' will only take the values 0 or 2 here since all
1941 * frames are required to be aligned to 2-byte boundaries
1942 * when being passed to mac80211; the code here works just
1943 * as well if that isn't true, but mac80211 assumes it can
1944 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1948 align
= (unsigned long)(skb
->data
+ sizeof(struct ethhdr
)) & 3;
1950 if (WARN_ON(skb_headroom(skb
) < 3)) {
1954 u8
*data
= skb
->data
;
1955 size_t len
= skb_headlen(skb
);
1957 memmove(skb
->data
, data
, len
);
1958 skb_set_tail_pointer(skb
, len
);
1965 /* deliver to local stack */
1966 skb
->protocol
= eth_type_trans(skb
, dev
);
1967 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1968 if (rx
->local
->napi
)
1969 napi_gro_receive(rx
->local
->napi
, skb
);
1971 netif_receive_skb(skb
);
1976 * Send to wireless media and increase priority by 256 to
1977 * keep the received priority instead of reclassifying
1978 * the frame (see cfg80211_classify8021d).
1980 xmit_skb
->priority
+= 256;
1981 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1982 skb_reset_network_header(xmit_skb
);
1983 skb_reset_mac_header(xmit_skb
);
1984 dev_queue_xmit(xmit_skb
);
1988 static ieee80211_rx_result debug_noinline
1989 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1991 struct net_device
*dev
= rx
->sdata
->dev
;
1992 struct sk_buff
*skb
= rx
->skb
;
1993 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1994 __le16 fc
= hdr
->frame_control
;
1995 struct sk_buff_head frame_list
;
1996 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1998 if (unlikely(!ieee80211_is_data(fc
)))
2001 if (unlikely(!ieee80211_is_data_present(fc
)))
2002 return RX_DROP_MONITOR
;
2004 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
2007 if (ieee80211_has_a4(hdr
->frame_control
) &&
2008 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2009 !rx
->sdata
->u
.vlan
.sta
)
2010 return RX_DROP_UNUSABLE
;
2012 if (is_multicast_ether_addr(hdr
->addr1
) &&
2013 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2014 rx
->sdata
->u
.vlan
.sta
) ||
2015 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2016 rx
->sdata
->u
.mgd
.use_4addr
)))
2017 return RX_DROP_UNUSABLE
;
2020 __skb_queue_head_init(&frame_list
);
2022 if (skb_linearize(skb
))
2023 return RX_DROP_UNUSABLE
;
2025 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
2026 rx
->sdata
->vif
.type
,
2027 rx
->local
->hw
.extra_tx_headroom
, true);
2029 while (!skb_queue_empty(&frame_list
)) {
2030 rx
->skb
= __skb_dequeue(&frame_list
);
2032 if (!ieee80211_frame_allowed(rx
, fc
)) {
2033 dev_kfree_skb(rx
->skb
);
2036 dev
->stats
.rx_packets
++;
2037 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2039 ieee80211_deliver_skb(rx
);
2045 #ifdef CONFIG_MAC80211_MESH
2046 static ieee80211_rx_result
2047 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
2049 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
2050 struct ieee80211_tx_info
*info
;
2051 struct ieee80211s_hdr
*mesh_hdr
;
2052 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
2053 struct ieee80211_local
*local
= rx
->local
;
2054 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2055 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2056 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
2059 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2060 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2062 /* make sure fixed part of mesh header is there, also checks skb len */
2063 if (!pskb_may_pull(rx
->skb
, hdrlen
+ 6))
2064 return RX_DROP_MONITOR
;
2066 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2068 /* make sure full mesh header is there, also checks skb len */
2069 if (!pskb_may_pull(rx
->skb
,
2070 hdrlen
+ ieee80211_get_mesh_hdrlen(mesh_hdr
)))
2071 return RX_DROP_MONITOR
;
2073 /* reload pointers */
2074 hdr
= (struct ieee80211_hdr
*) skb
->data
;
2075 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
2077 /* frame is in RMC, don't forward */
2078 if (ieee80211_is_data(hdr
->frame_control
) &&
2079 is_multicast_ether_addr(hdr
->addr1
) &&
2080 mesh_rmc_check(rx
->sdata
, hdr
->addr3
, mesh_hdr
))
2081 return RX_DROP_MONITOR
;
2083 if (!ieee80211_is_data(hdr
->frame_control
) ||
2084 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2088 return RX_DROP_MONITOR
;
2090 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
2091 struct mesh_path
*mppath
;
2095 if (is_multicast_ether_addr(hdr
->addr1
)) {
2096 mpp_addr
= hdr
->addr3
;
2097 proxied_addr
= mesh_hdr
->eaddr1
;
2098 } else if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
2099 /* has_a4 already checked in ieee80211_rx_mesh_check */
2100 mpp_addr
= hdr
->addr4
;
2101 proxied_addr
= mesh_hdr
->eaddr2
;
2103 return RX_DROP_MONITOR
;
2107 mppath
= mpp_path_lookup(sdata
, proxied_addr
);
2109 mpp_path_add(sdata
, proxied_addr
, mpp_addr
);
2111 spin_lock_bh(&mppath
->state_lock
);
2112 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
2113 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
2114 spin_unlock_bh(&mppath
->state_lock
);
2119 /* Frame has reached destination. Don't forward */
2120 if (!is_multicast_ether_addr(hdr
->addr1
) &&
2121 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
2124 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
2125 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
2126 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
2127 return RX_DROP_MONITOR
;
2129 skb_set_queue_mapping(skb
, q
);
2131 if (!--mesh_hdr
->ttl
) {
2132 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
2136 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
2139 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
2141 net_info_ratelimited("%s: failed to clone mesh frame\n",
2146 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
2147 fwd_hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
);
2148 info
= IEEE80211_SKB_CB(fwd_skb
);
2149 memset(info
, 0, sizeof(*info
));
2150 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
2151 info
->control
.vif
= &rx
->sdata
->vif
;
2152 info
->control
.jiffies
= jiffies
;
2153 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
2154 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
2155 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
2156 /* update power mode indication when forwarding */
2157 ieee80211_mps_set_frame_flags(sdata
, NULL
, fwd_hdr
);
2158 } else if (!mesh_nexthop_lookup(sdata
, fwd_skb
)) {
2159 /* mesh power mode flags updated in mesh_nexthop_lookup */
2160 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
2162 /* unable to resolve next hop */
2163 mesh_path_error_tx(sdata
, ifmsh
->mshcfg
.element_ttl
,
2165 WLAN_REASON_MESH_PATH_NOFORWARD
,
2167 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
2169 return RX_DROP_MONITOR
;
2172 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
2173 ieee80211_add_pending_skb(local
, fwd_skb
);
2175 if (is_multicast_ether_addr(hdr
->addr1
) ||
2176 sdata
->dev
->flags
& IFF_PROMISC
)
2179 return RX_DROP_MONITOR
;
2183 static ieee80211_rx_result debug_noinline
2184 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2186 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2187 struct ieee80211_local
*local
= rx
->local
;
2188 struct net_device
*dev
= sdata
->dev
;
2189 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2190 __le16 fc
= hdr
->frame_control
;
2194 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2197 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2198 return RX_DROP_MONITOR
;
2201 * Send unexpected-4addr-frame event to hostapd. For older versions,
2202 * also drop the frame to cooked monitor interfaces.
2204 if (ieee80211_has_a4(hdr
->frame_control
) &&
2205 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2207 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2208 cfg80211_rx_unexpected_4addr_frame(
2209 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2210 return RX_DROP_MONITOR
;
2213 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2215 return RX_DROP_UNUSABLE
;
2217 if (!ieee80211_frame_allowed(rx
, fc
))
2218 return RX_DROP_MONITOR
;
2220 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2221 unlikely(port_control
) && sdata
->bss
) {
2222 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2230 dev
->stats
.rx_packets
++;
2231 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2233 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2234 !is_multicast_ether_addr(
2235 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2236 (!local
->scanning
&&
2237 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2238 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2239 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2242 ieee80211_deliver_skb(rx
);
2247 static ieee80211_rx_result debug_noinline
2248 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
2250 struct sk_buff
*skb
= rx
->skb
;
2251 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2252 struct tid_ampdu_rx
*tid_agg_rx
;
2256 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2259 if (ieee80211_is_back_req(bar
->frame_control
)) {
2261 __le16 control
, start_seq_num
;
2262 } __packed bar_data
;
2265 return RX_DROP_MONITOR
;
2267 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2268 &bar_data
, sizeof(bar_data
)))
2269 return RX_DROP_MONITOR
;
2271 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2273 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2275 return RX_DROP_MONITOR
;
2277 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2279 /* reset session timer */
2280 if (tid_agg_rx
->timeout
)
2281 mod_timer(&tid_agg_rx
->session_timer
,
2282 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2284 spin_lock(&tid_agg_rx
->reorder_lock
);
2285 /* release stored frames up to start of BAR */
2286 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2287 start_seq_num
, frames
);
2288 spin_unlock(&tid_agg_rx
->reorder_lock
);
2295 * After this point, we only want management frames,
2296 * so we can drop all remaining control frames to
2297 * cooked monitor interfaces.
2299 return RX_DROP_MONITOR
;
2302 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2303 struct ieee80211_mgmt
*mgmt
,
2306 struct ieee80211_local
*local
= sdata
->local
;
2307 struct sk_buff
*skb
;
2308 struct ieee80211_mgmt
*resp
;
2310 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2311 /* Not to own unicast address */
2315 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2316 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2317 /* Not from the current AP or not associated yet. */
2321 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2322 /* Too short SA Query request frame */
2326 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2330 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2331 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2332 memset(resp
, 0, 24);
2333 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2334 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2335 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2336 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2337 IEEE80211_STYPE_ACTION
);
2338 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2339 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2340 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2341 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2342 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2343 WLAN_SA_QUERY_TR_ID_LEN
);
2345 ieee80211_tx_skb(sdata
, skb
);
2348 static ieee80211_rx_result debug_noinline
2349 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2351 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2352 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2355 * From here on, look only at management frames.
2356 * Data and control frames are already handled,
2357 * and unknown (reserved) frames are useless.
2359 if (rx
->skb
->len
< 24)
2360 return RX_DROP_MONITOR
;
2362 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2363 return RX_DROP_MONITOR
;
2365 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2366 ieee80211_is_beacon(mgmt
->frame_control
) &&
2367 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2370 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2371 sig
= status
->signal
;
2373 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2374 rx
->skb
->data
, rx
->skb
->len
,
2376 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2379 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2380 return RX_DROP_MONITOR
;
2382 if (ieee80211_drop_unencrypted_mgmt(rx
))
2383 return RX_DROP_UNUSABLE
;
2388 static ieee80211_rx_result debug_noinline
2389 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2391 struct ieee80211_local
*local
= rx
->local
;
2392 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2393 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2394 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2395 int len
= rx
->skb
->len
;
2397 if (!ieee80211_is_action(mgmt
->frame_control
))
2400 /* drop too small frames */
2401 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2402 return RX_DROP_UNUSABLE
;
2404 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
&&
2405 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SELF_PROTECTED
&&
2406 mgmt
->u
.action
.category
!= WLAN_CATEGORY_SPECTRUM_MGMT
)
2407 return RX_DROP_UNUSABLE
;
2409 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2410 return RX_DROP_UNUSABLE
;
2412 switch (mgmt
->u
.action
.category
) {
2413 case WLAN_CATEGORY_HT
:
2414 /* reject HT action frames from stations not supporting HT */
2415 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2418 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2419 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2420 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2421 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2422 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2425 /* verify action & smps_control/chanwidth are present */
2426 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2429 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2430 case WLAN_HT_ACTION_SMPS
: {
2431 struct ieee80211_supported_band
*sband
;
2432 enum ieee80211_smps_mode smps_mode
;
2434 /* convert to HT capability */
2435 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2436 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2437 smps_mode
= IEEE80211_SMPS_OFF
;
2439 case WLAN_HT_SMPS_CONTROL_STATIC
:
2440 smps_mode
= IEEE80211_SMPS_STATIC
;
2442 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2443 smps_mode
= IEEE80211_SMPS_DYNAMIC
;
2449 /* if no change do nothing */
2450 if (rx
->sta
->sta
.smps_mode
== smps_mode
)
2452 rx
->sta
->sta
.smps_mode
= smps_mode
;
2454 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2456 rate_control_rate_update(local
, sband
, rx
->sta
,
2457 IEEE80211_RC_SMPS_CHANGED
);
2460 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH
: {
2461 struct ieee80211_supported_band
*sband
;
2462 u8 chanwidth
= mgmt
->u
.action
.u
.ht_notify_cw
.chanwidth
;
2463 enum ieee80211_sta_rx_bandwidth new_bw
;
2465 /* If it doesn't support 40 MHz it can't change ... */
2466 if (!(rx
->sta
->sta
.ht_cap
.cap
&
2467 IEEE80211_HT_CAP_SUP_WIDTH_20_40
))
2470 if (chanwidth
== IEEE80211_HT_CHANWIDTH_20MHZ
)
2471 new_bw
= IEEE80211_STA_RX_BW_20
;
2473 new_bw
= ieee80211_sta_cur_vht_bw(rx
->sta
);
2475 if (rx
->sta
->sta
.bandwidth
== new_bw
)
2478 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2480 rate_control_rate_update(local
, sband
, rx
->sta
,
2481 IEEE80211_RC_BW_CHANGED
);
2489 case WLAN_CATEGORY_PUBLIC
:
2490 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2492 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2496 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2498 if (mgmt
->u
.action
.u
.ext_chan_switch
.action_code
!=
2499 WLAN_PUB_ACTION_EXT_CHANSW_ANN
)
2501 if (len
< offsetof(struct ieee80211_mgmt
,
2502 u
.action
.u
.ext_chan_switch
.variable
))
2505 case WLAN_CATEGORY_VHT
:
2506 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2507 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2508 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2509 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2510 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2513 /* verify action code is present */
2514 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2517 switch (mgmt
->u
.action
.u
.vht_opmode_notif
.action_code
) {
2518 case WLAN_VHT_ACTION_OPMODE_NOTIF
: {
2521 /* verify opmode is present */
2522 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2525 opmode
= mgmt
->u
.action
.u
.vht_opmode_notif
.operating_mode
;
2527 ieee80211_vht_handle_opmode(rx
->sdata
, rx
->sta
,
2528 opmode
, status
->band
,
2536 case WLAN_CATEGORY_BACK
:
2537 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2538 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2539 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2540 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2541 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2544 /* verify action_code is present */
2545 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2548 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2549 case WLAN_ACTION_ADDBA_REQ
:
2550 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2551 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2554 case WLAN_ACTION_ADDBA_RESP
:
2555 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2556 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2559 case WLAN_ACTION_DELBA
:
2560 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2561 sizeof(mgmt
->u
.action
.u
.delba
)))
2569 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2570 /* verify action_code is present */
2571 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2574 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2575 case WLAN_ACTION_SPCT_MSR_REQ
:
2576 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2579 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2580 sizeof(mgmt
->u
.action
.u
.measurement
)))
2583 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2586 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2588 case WLAN_ACTION_SPCT_CHL_SWITCH
: {
2590 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2591 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2594 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2595 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2596 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2599 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2600 bssid
= sdata
->u
.mgd
.bssid
;
2601 else if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2602 bssid
= sdata
->u
.ibss
.bssid
;
2603 else if (sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
2608 if (!ether_addr_equal(mgmt
->bssid
, bssid
))
2615 case WLAN_CATEGORY_SA_QUERY
:
2616 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2617 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2620 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2621 case WLAN_ACTION_SA_QUERY_REQUEST
:
2622 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2624 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2628 case WLAN_CATEGORY_SELF_PROTECTED
:
2629 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2630 sizeof(mgmt
->u
.action
.u
.self_prot
.action_code
)))
2633 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2634 case WLAN_SP_MESH_PEERING_OPEN
:
2635 case WLAN_SP_MESH_PEERING_CLOSE
:
2636 case WLAN_SP_MESH_PEERING_CONFIRM
:
2637 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2639 if (sdata
->u
.mesh
.user_mpm
)
2640 /* userspace handles this frame */
2643 case WLAN_SP_MGK_INFORM
:
2644 case WLAN_SP_MGK_ACK
:
2645 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2650 case WLAN_CATEGORY_MESH_ACTION
:
2651 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2652 sizeof(mgmt
->u
.action
.u
.mesh_action
.action_code
)))
2655 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2657 if (mesh_action_is_path_sel(mgmt
) &&
2658 !mesh_path_sel_is_hwmp(sdata
))
2666 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2667 /* will return in the next handlers */
2672 rx
->sta
->rx_packets
++;
2673 dev_kfree_skb(rx
->skb
);
2677 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2678 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2679 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2681 rx
->sta
->rx_packets
++;
2685 static ieee80211_rx_result debug_noinline
2686 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2688 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2691 /* skip known-bad action frames and return them in the next handler */
2692 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2696 * Getting here means the kernel doesn't know how to handle
2697 * it, but maybe userspace does ... include returned frames
2698 * so userspace can register for those to know whether ones
2699 * it transmitted were processed or returned.
2702 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2703 sig
= status
->signal
;
2705 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2706 rx
->skb
->data
, rx
->skb
->len
, 0, GFP_ATOMIC
)) {
2708 rx
->sta
->rx_packets
++;
2709 dev_kfree_skb(rx
->skb
);
2716 static ieee80211_rx_result debug_noinline
2717 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2719 struct ieee80211_local
*local
= rx
->local
;
2720 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2721 struct sk_buff
*nskb
;
2722 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2723 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2725 if (!ieee80211_is_action(mgmt
->frame_control
))
2729 * For AP mode, hostapd is responsible for handling any action
2730 * frames that we didn't handle, including returning unknown
2731 * ones. For all other modes we will return them to the sender,
2732 * setting the 0x80 bit in the action category, as required by
2733 * 802.11-2012 9.24.4.
2734 * Newer versions of hostapd shall also use the management frame
2735 * registration mechanisms, but older ones still use cooked
2736 * monitor interfaces so push all frames there.
2738 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2739 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2740 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2741 return RX_DROP_MONITOR
;
2743 if (is_multicast_ether_addr(mgmt
->da
))
2744 return RX_DROP_MONITOR
;
2746 /* do not return rejected action frames */
2747 if (mgmt
->u
.action
.category
& 0x80)
2748 return RX_DROP_UNUSABLE
;
2750 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2753 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2755 nmgmt
->u
.action
.category
|= 0x80;
2756 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2757 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2759 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2761 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_P2P_DEVICE
) {
2762 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(nskb
);
2764 info
->flags
= IEEE80211_TX_CTL_TX_OFFCHAN
|
2765 IEEE80211_TX_INTFL_OFFCHAN_TX_OK
|
2766 IEEE80211_TX_CTL_NO_CCK_RATE
;
2767 if (local
->hw
.flags
& IEEE80211_HW_QUEUE_CONTROL
)
2769 local
->hw
.offchannel_tx_hw_queue
;
2772 __ieee80211_tx_skb_tid_band(rx
->sdata
, nskb
, 7,
2775 dev_kfree_skb(rx
->skb
);
2779 static ieee80211_rx_result debug_noinline
2780 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2782 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2783 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2786 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2788 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2789 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2790 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2791 return RX_DROP_MONITOR
;
2794 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2795 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2796 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2797 /* process for all: mesh, mlme, ibss */
2799 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2800 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2801 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2802 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2803 if (is_multicast_ether_addr(mgmt
->da
) &&
2804 !is_broadcast_ether_addr(mgmt
->da
))
2805 return RX_DROP_MONITOR
;
2807 /* process only for station */
2808 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2809 return RX_DROP_MONITOR
;
2811 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2812 /* process only for ibss and mesh */
2813 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2814 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
)
2815 return RX_DROP_MONITOR
;
2818 return RX_DROP_MONITOR
;
2821 /* queue up frame and kick off work to process it */
2822 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2823 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2824 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2826 rx
->sta
->rx_packets
++;
2831 /* TODO: use IEEE80211_RX_FRAGMENTED */
2832 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2833 struct ieee80211_rate
*rate
)
2835 struct ieee80211_sub_if_data
*sdata
;
2836 struct ieee80211_local
*local
= rx
->local
;
2837 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2838 struct net_device
*prev_dev
= NULL
;
2839 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2840 int needed_headroom
;
2843 * If cooked monitor has been processed already, then
2844 * don't do it again. If not, set the flag.
2846 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2848 rx
->flags
|= IEEE80211_RX_CMNTR
;
2850 /* If there are no cooked monitor interfaces, just free the SKB */
2851 if (!local
->cooked_mntrs
)
2854 /* room for the radiotap header based on driver features */
2855 needed_headroom
= ieee80211_rx_radiotap_space(local
, status
);
2857 if (skb_headroom(skb
) < needed_headroom
&&
2858 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2861 /* prepend radiotap information */
2862 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2865 skb_set_mac_header(skb
, 0);
2866 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2867 skb
->pkt_type
= PACKET_OTHERHOST
;
2868 skb
->protocol
= htons(ETH_P_802_2
);
2870 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2871 if (!ieee80211_sdata_running(sdata
))
2874 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2875 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2879 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2881 skb2
->dev
= prev_dev
;
2882 netif_receive_skb(skb2
);
2886 prev_dev
= sdata
->dev
;
2887 sdata
->dev
->stats
.rx_packets
++;
2888 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2892 skb
->dev
= prev_dev
;
2893 netif_receive_skb(skb
);
2901 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2902 ieee80211_rx_result res
)
2905 case RX_DROP_MONITOR
:
2906 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2908 rx
->sta
->rx_dropped
++;
2911 struct ieee80211_rate
*rate
= NULL
;
2912 struct ieee80211_supported_band
*sband
;
2913 struct ieee80211_rx_status
*status
;
2915 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2917 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2918 if (!(status
->flag
& RX_FLAG_HT
) &&
2919 !(status
->flag
& RX_FLAG_VHT
))
2920 rate
= &sband
->bitrates
[status
->rate_idx
];
2922 ieee80211_rx_cooked_monitor(rx
, rate
);
2925 case RX_DROP_UNUSABLE
:
2926 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2928 rx
->sta
->rx_dropped
++;
2929 dev_kfree_skb(rx
->skb
);
2932 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2937 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2938 struct sk_buff_head
*frames
)
2940 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2941 struct sk_buff
*skb
;
2943 #define CALL_RXH(rxh) \
2946 if (res != RX_CONTINUE) \
2950 spin_lock_bh(&rx
->local
->rx_path_lock
);
2952 while ((skb
= __skb_dequeue(frames
))) {
2954 * all the other fields are valid across frames
2955 * that belong to an aMPDU since they are on the
2956 * same TID from the same station
2960 CALL_RXH(ieee80211_rx_h_check_more_data
)
2961 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2962 CALL_RXH(ieee80211_rx_h_sta_process
)
2963 CALL_RXH(ieee80211_rx_h_decrypt
)
2964 CALL_RXH(ieee80211_rx_h_defragment
)
2965 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2966 /* must be after MMIC verify so header is counted in MPDU mic */
2967 #ifdef CONFIG_MAC80211_MESH
2968 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2969 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2971 CALL_RXH(ieee80211_rx_h_amsdu
)
2972 CALL_RXH(ieee80211_rx_h_data
)
2974 /* special treatment -- needs the queue */
2975 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2976 if (res
!= RX_CONTINUE
)
2979 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2980 CALL_RXH(ieee80211_rx_h_action
)
2981 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2982 CALL_RXH(ieee80211_rx_h_action_return
)
2983 CALL_RXH(ieee80211_rx_h_mgmt
)
2986 ieee80211_rx_handlers_result(rx
, res
);
2991 spin_unlock_bh(&rx
->local
->rx_path_lock
);
2994 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2996 struct sk_buff_head reorder_release
;
2997 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2999 __skb_queue_head_init(&reorder_release
);
3001 #define CALL_RXH(rxh) \
3004 if (res != RX_CONTINUE) \
3008 CALL_RXH(ieee80211_rx_h_check
)
3010 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
3012 ieee80211_rx_handlers(rx
, &reorder_release
);
3016 ieee80211_rx_handlers_result(rx
, res
);
3022 * This function makes calls into the RX path, therefore
3023 * it has to be invoked under RCU read lock.
3025 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
3027 struct sk_buff_head frames
;
3028 struct ieee80211_rx_data rx
= {
3030 .sdata
= sta
->sdata
,
3031 .local
= sta
->local
,
3032 /* This is OK -- must be QoS data frame */
3033 .security_idx
= tid
,
3037 struct tid_ampdu_rx
*tid_agg_rx
;
3039 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
3043 __skb_queue_head_init(&frames
);
3045 spin_lock(&tid_agg_rx
->reorder_lock
);
3046 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
, &frames
);
3047 spin_unlock(&tid_agg_rx
->reorder_lock
);
3049 ieee80211_rx_handlers(&rx
, &frames
);
3052 /* main receive path */
3054 static bool prepare_for_handlers(struct ieee80211_rx_data
*rx
,
3055 struct ieee80211_hdr
*hdr
)
3057 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3058 struct sk_buff
*skb
= rx
->skb
;
3059 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3060 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
3061 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
3063 switch (sdata
->vif
.type
) {
3064 case NL80211_IFTYPE_STATION
:
3065 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
3068 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3069 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
3070 sdata
->u
.mgd
.use_4addr
)
3072 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3075 case NL80211_IFTYPE_ADHOC
:
3078 if (ether_addr_equal(sdata
->vif
.addr
, hdr
->addr2
) ||
3079 ether_addr_equal(sdata
->u
.ibss
.bssid
, hdr
->addr2
))
3081 if (ieee80211_is_beacon(hdr
->frame_control
)) {
3083 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
3085 } else if (!multicast
&&
3086 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3087 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3089 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3090 } else if (!rx
->sta
) {
3092 if (status
->flag
& (RX_FLAG_HT
| RX_FLAG_VHT
))
3093 rate_idx
= 0; /* TODO: HT/VHT rates */
3095 rate_idx
= status
->rate_idx
;
3096 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
3100 case NL80211_IFTYPE_MESH_POINT
:
3102 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
3103 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
3106 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3109 case NL80211_IFTYPE_AP_VLAN
:
3110 case NL80211_IFTYPE_AP
:
3112 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3114 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
3116 * Accept public action frames even when the
3117 * BSSID doesn't match, this is used for P2P
3118 * and location updates. Note that mac80211
3119 * itself never looks at these frames.
3122 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
3124 if (ieee80211_is_public_action(hdr
, skb
->len
))
3126 if (!ieee80211_is_beacon(hdr
->frame_control
))
3128 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3131 case NL80211_IFTYPE_WDS
:
3132 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
3134 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
3137 case NL80211_IFTYPE_P2P_DEVICE
:
3138 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
3139 !ieee80211_is_probe_req(hdr
->frame_control
) &&
3140 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
3141 !ieee80211_is_beacon(hdr
->frame_control
))
3143 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
) &&
3145 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
3148 /* should never get here */
3157 * This function returns whether or not the SKB
3158 * was destined for RX processing or not, which,
3159 * if consume is true, is equivalent to whether
3160 * or not the skb was consumed.
3162 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
3163 struct sk_buff
*skb
, bool consume
)
3165 struct ieee80211_local
*local
= rx
->local
;
3166 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
3167 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3168 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
3171 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
3173 if (!prepare_for_handlers(rx
, hdr
))
3177 skb
= skb_copy(skb
, GFP_ATOMIC
);
3179 if (net_ratelimit())
3180 wiphy_debug(local
->hw
.wiphy
,
3181 "failed to copy skb for %s\n",
3189 ieee80211_invoke_rx_handlers(rx
);
3194 * This is the actual Rx frames handler. as it blongs to Rx path it must
3195 * be called with rcu_read_lock protection.
3197 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
3198 struct sk_buff
*skb
)
3200 struct ieee80211_local
*local
= hw_to_local(hw
);
3201 struct ieee80211_sub_if_data
*sdata
;
3202 struct ieee80211_hdr
*hdr
;
3204 struct ieee80211_rx_data rx
;
3205 struct ieee80211_sub_if_data
*prev
;
3206 struct sta_info
*sta
, *tmp
, *prev_sta
;
3209 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
3210 memset(&rx
, 0, sizeof(rx
));
3214 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
3215 local
->dot11ReceivedFragmentCount
++;
3217 if (ieee80211_is_mgmt(fc
)) {
3218 /* drop frame if too short for header */
3219 if (skb
->len
< ieee80211_hdrlen(fc
))
3222 err
= skb_linearize(skb
);
3224 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
3232 hdr
= (struct ieee80211_hdr
*)skb
->data
;
3233 ieee80211_parse_qos(&rx
);
3234 ieee80211_verify_alignment(&rx
);
3236 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
3237 ieee80211_is_beacon(hdr
->frame_control
)))
3238 ieee80211_scan_rx(local
, skb
);
3240 if (ieee80211_is_data(fc
)) {
3243 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
3250 rx
.sdata
= prev_sta
->sdata
;
3251 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3258 rx
.sdata
= prev_sta
->sdata
;
3260 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3268 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
3269 if (!ieee80211_sdata_running(sdata
))
3272 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
3273 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
3277 * frame is destined for this interface, but if it's
3278 * not also for the previous one we handle that after
3279 * the loop to avoid copying the SKB once too much
3287 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3289 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
3295 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
3298 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3307 * This is the receive path handler. It is called by a low level driver when an
3308 * 802.11 MPDU is received from the hardware.
3310 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3312 struct ieee80211_local
*local
= hw_to_local(hw
);
3313 struct ieee80211_rate
*rate
= NULL
;
3314 struct ieee80211_supported_band
*sband
;
3315 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3317 WARN_ON_ONCE(softirq_count() == 0);
3319 if (WARN_ON(status
->band
>= IEEE80211_NUM_BANDS
))
3322 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3323 if (WARN_ON(!sband
))
3327 * If we're suspending, it is possible although not too likely
3328 * that we'd be receiving frames after having already partially
3329 * quiesced the stack. We can't process such frames then since
3330 * that might, for example, cause stations to be added or other
3331 * driver callbacks be invoked.
3333 if (unlikely(local
->quiescing
|| local
->suspended
))
3336 /* We might be during a HW reconfig, prevent Rx for the same reason */
3337 if (unlikely(local
->in_reconfig
))
3341 * The same happens when we're not even started,
3342 * but that's worth a warning.
3344 if (WARN_ON(!local
->started
))
3347 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3349 * Validate the rate, unless a PLCP error means that
3350 * we probably can't have a valid rate here anyway.
3353 if (status
->flag
& RX_FLAG_HT
) {
3355 * rate_idx is MCS index, which can be [0-76]
3358 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3360 * Anything else would be some sort of driver or
3361 * hardware error. The driver should catch hardware
3364 if (WARN(status
->rate_idx
> 76,
3365 "Rate marked as an HT rate but passed "
3366 "status->rate_idx is not "
3367 "an MCS index [0-76]: %d (0x%02x)\n",
3371 } else if (status
->flag
& RX_FLAG_VHT
) {
3372 if (WARN_ONCE(status
->rate_idx
> 9 ||
3374 status
->vht_nss
> 8,
3375 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3376 status
->rate_idx
, status
->vht_nss
))
3379 if (WARN_ON(status
->rate_idx
>= sband
->n_bitrates
))
3381 rate
= &sband
->bitrates
[status
->rate_idx
];
3385 status
->rx_flags
= 0;
3388 * key references and virtual interfaces are protected using RCU
3389 * and this requires that we are in a read-side RCU section during
3390 * receive processing
3395 * Frames with failed FCS/PLCP checksum are not returned,
3396 * all other frames are returned without radiotap header
3397 * if it was previously present.
3398 * Also, frames with less than 16 bytes are dropped.
3400 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3406 ieee80211_tpt_led_trig_rx(local
,
3407 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3409 __ieee80211_rx_handle_packet(hw
, skb
);
3417 EXPORT_SYMBOL(ieee80211_rx
);
3419 /* This is a version of the rx handler that can be called from hard irq
3420 * context. Post the skb on the queue and schedule the tasklet */
3421 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3423 struct ieee80211_local
*local
= hw_to_local(hw
);
3425 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3427 skb
->pkt_type
= IEEE80211_RX_MSG
;
3428 skb_queue_tail(&local
->skb_queue
, skb
);
3429 tasklet_schedule(&local
->tasklet
);
3431 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);