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
,
60 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
61 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
63 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
|
64 RX_FLAG_FAILED_PLCP_CRC
|
65 RX_FLAG_AMPDU_IS_ZEROLEN
))
67 if (unlikely(skb
->len
< 16 + present_fcs_len
))
69 if (ieee80211_is_ctl(hdr
->frame_control
) &&
70 !ieee80211_is_pspoll(hdr
->frame_control
) &&
71 !ieee80211_is_back_req(hdr
->frame_control
))
77 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
78 struct ieee80211_rx_status
*status
)
82 /* always present fields */
83 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
85 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
87 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
90 if (len
& 1) /* padding for RX_FLAGS if necessary */
93 if (status
->flag
& RX_FLAG_HT
) /* HT info */
96 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
107 * ieee80211_add_rx_radiotap_header - add radiotap header
109 * add a radiotap header containing all the fields which the hardware provided.
112 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
114 struct ieee80211_rate
*rate
,
115 int rtap_len
, bool has_fcs
)
117 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
118 struct ieee80211_radiotap_header
*rthdr
;
122 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
123 memset(rthdr
, 0, rtap_len
);
125 /* radiotap header, set always present flags */
127 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
128 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
129 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
130 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
131 rthdr
->it_len
= cpu_to_le16(rtap_len
);
133 pos
= (unsigned char *)(rthdr
+1);
135 /* the order of the following fields is important */
137 /* IEEE80211_RADIOTAP_TSFT */
138 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
139 put_unaligned_le64(status
->mactime
, pos
);
141 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
145 /* IEEE80211_RADIOTAP_FLAGS */
146 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
147 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
148 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
149 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
150 if (status
->flag
& RX_FLAG_SHORTPRE
)
151 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
154 /* IEEE80211_RADIOTAP_RATE */
155 if (!rate
|| status
->flag
& RX_FLAG_HT
) {
157 * Without rate information don't add it. If we have,
158 * MCS information is a separate field in radiotap,
159 * added below. The byte here is needed as padding
160 * for the channel though, so initialise it to 0.
164 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
165 *pos
= rate
->bitrate
/ 5;
169 /* IEEE80211_RADIOTAP_CHANNEL */
170 put_unaligned_le16(status
->freq
, pos
);
172 if (status
->band
== IEEE80211_BAND_5GHZ
)
173 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
175 else if (status
->flag
& RX_FLAG_HT
)
176 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
178 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
179 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
182 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
185 put_unaligned_le16(IEEE80211_CHAN_2GHZ
, pos
);
188 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
189 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
190 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
191 *pos
= status
->signal
;
193 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
197 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199 /* IEEE80211_RADIOTAP_ANTENNA */
200 *pos
= status
->antenna
;
203 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205 /* IEEE80211_RADIOTAP_RX_FLAGS */
206 /* ensure 2 byte alignment for the 2 byte field as required */
207 if ((pos
- (u8
*)rthdr
) & 1)
209 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
210 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
211 put_unaligned_le16(rx_flags
, pos
);
214 if (status
->flag
& RX_FLAG_HT
) {
215 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
216 *pos
++ = local
->hw
.radiotap_mcs_details
;
218 if (status
->flag
& RX_FLAG_SHORT_GI
)
219 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
220 if (status
->flag
& RX_FLAG_40MHZ
)
221 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
222 if (status
->flag
& RX_FLAG_HT_GF
)
223 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
225 *pos
++ = status
->rate_idx
;
228 if (status
->flag
& RX_FLAG_AMPDU_DETAILS
) {
231 /* ensure 4 byte alignment */
232 while ((pos
- (u8
*)rthdr
) & 3)
235 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS
);
236 put_unaligned_le32(status
->ampdu_reference
, pos
);
238 if (status
->flag
& RX_FLAG_AMPDU_REPORT_ZEROLEN
)
239 flags
|= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN
;
240 if (status
->flag
& RX_FLAG_AMPDU_IS_ZEROLEN
)
241 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN
;
242 if (status
->flag
& RX_FLAG_AMPDU_LAST_KNOWN
)
243 flags
|= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN
;
244 if (status
->flag
& RX_FLAG_AMPDU_IS_LAST
)
245 flags
|= IEEE80211_RADIOTAP_AMPDU_IS_LAST
;
246 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_ERROR
)
247 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR
;
248 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
249 flags
|= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN
;
250 put_unaligned_le16(flags
, pos
);
252 if (status
->flag
& RX_FLAG_AMPDU_DELIM_CRC_KNOWN
)
253 *pos
++ = status
->ampdu_delimiter_crc
;
261 * This function copies a received frame to all monitor interfaces and
262 * returns a cleaned-up SKB that no longer includes the FCS nor the
263 * radiotap header the driver might have added.
265 static struct sk_buff
*
266 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
267 struct ieee80211_rate
*rate
)
269 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
270 struct ieee80211_sub_if_data
*sdata
;
272 struct sk_buff
*skb
, *skb2
;
273 struct net_device
*prev_dev
= NULL
;
274 int present_fcs_len
= 0;
277 * First, we may need to make a copy of the skb because
278 * (1) we need to modify it for radiotap (if not present), and
279 * (2) the other RX handlers will modify the skb we got.
281 * We don't need to, of course, if we aren't going to return
282 * the SKB because it has a bad FCS/PLCP checksum.
285 /* room for the radiotap header based on driver features */
286 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
288 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
289 present_fcs_len
= FCS_LEN
;
291 /* make sure hdr->frame_control is on the linear part */
292 if (!pskb_may_pull(origskb
, 2)) {
293 dev_kfree_skb(origskb
);
297 if (!local
->monitors
) {
298 if (should_drop_frame(origskb
, present_fcs_len
)) {
299 dev_kfree_skb(origskb
);
303 return remove_monitor_info(local
, origskb
);
306 if (should_drop_frame(origskb
, present_fcs_len
)) {
307 /* only need to expand headroom if necessary */
312 * This shouldn't trigger often because most devices have an
313 * RX header they pull before we get here, and that should
314 * be big enough for our radiotap information. We should
315 * probably export the length to drivers so that we can have
316 * them allocate enough headroom to start with.
318 if (skb_headroom(skb
) < needed_headroom
&&
319 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
325 * Need to make a copy and possibly remove radiotap header
326 * and FCS from the original.
328 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
330 origskb
= remove_monitor_info(local
, origskb
);
336 /* prepend radiotap information */
337 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
340 skb_reset_mac_header(skb
);
341 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
342 skb
->pkt_type
= PACKET_OTHERHOST
;
343 skb
->protocol
= htons(ETH_P_802_2
);
345 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
346 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
349 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
352 if (!ieee80211_sdata_running(sdata
))
356 skb2
= skb_clone(skb
, GFP_ATOMIC
);
358 skb2
->dev
= prev_dev
;
359 netif_receive_skb(skb2
);
363 prev_dev
= sdata
->dev
;
364 sdata
->dev
->stats
.rx_packets
++;
365 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
370 netif_receive_skb(skb
);
378 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
380 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
381 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
382 int tid
, seqno_idx
, security_idx
;
384 /* does the frame have a qos control field? */
385 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
386 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
387 /* frame has qos control */
388 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
389 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
390 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
396 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
398 * Sequence numbers for management frames, QoS data
399 * frames with a broadcast/multicast address in the
400 * Address 1 field, and all non-QoS data frames sent
401 * by QoS STAs are assigned using an additional single
402 * modulo-4096 counter, [...]
404 * We also use that counter for non-QoS STAs.
406 seqno_idx
= NUM_RX_DATA_QUEUES
;
408 if (ieee80211_is_mgmt(hdr
->frame_control
))
409 security_idx
= NUM_RX_DATA_QUEUES
;
413 rx
->seqno_idx
= seqno_idx
;
414 rx
->security_idx
= security_idx
;
415 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
416 * For now, set skb->priority to 0 for other cases. */
417 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
421 * DOC: Packet alignment
423 * Drivers always need to pass packets that are aligned to two-byte boundaries
426 * Additionally, should, if possible, align the payload data in a way that
427 * guarantees that the contained IP header is aligned to a four-byte
428 * boundary. In the case of regular frames, this simply means aligning the
429 * payload to a four-byte boundary (because either the IP header is directly
430 * contained, or IV/RFC1042 headers that have a length divisible by four are
431 * in front of it). If the payload data is not properly aligned and the
432 * architecture doesn't support efficient unaligned operations, mac80211
433 * will align the data.
435 * With A-MSDU frames, however, the payload data address must yield two modulo
436 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
437 * push the IP header further back to a multiple of four again. Thankfully, the
438 * specs were sane enough this time around to require padding each A-MSDU
439 * subframe to a length that is a multiple of four.
441 * Padding like Atheros hardware adds which is between the 802.11 header and
442 * the payload is not supported, the driver is required to move the 802.11
443 * header to be directly in front of the payload in that case.
445 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
447 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
448 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
449 "unaligned packet at 0x%p\n", rx
->skb
->data
);
456 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
458 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
460 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
463 return ieee80211_is_robust_mgmt_frame(hdr
);
467 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
469 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
471 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
474 return ieee80211_is_robust_mgmt_frame(hdr
);
478 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
479 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
481 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
482 struct ieee80211_mmie
*mmie
;
484 if (skb
->len
< 24 + sizeof(*mmie
) ||
485 !is_multicast_ether_addr(hdr
->da
))
488 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
489 return -1; /* not a robust management frame */
491 mmie
= (struct ieee80211_mmie
*)
492 (skb
->data
+ skb
->len
- sizeof(*mmie
));
493 if (mmie
->element_id
!= WLAN_EID_MMIE
||
494 mmie
->length
!= sizeof(*mmie
) - 2)
497 return le16_to_cpu(mmie
->key_id
);
501 static ieee80211_rx_result
502 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
504 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
505 char *dev_addr
= rx
->sdata
->vif
.addr
;
507 if (ieee80211_is_data(hdr
->frame_control
)) {
508 if (is_multicast_ether_addr(hdr
->addr1
)) {
509 if (ieee80211_has_tods(hdr
->frame_control
) ||
510 !ieee80211_has_fromds(hdr
->frame_control
))
511 return RX_DROP_MONITOR
;
512 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
513 return RX_DROP_MONITOR
;
515 if (!ieee80211_has_a4(hdr
->frame_control
))
516 return RX_DROP_MONITOR
;
517 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
518 return RX_DROP_MONITOR
;
522 /* If there is not an established peer link and this is not a peer link
523 * establisment frame, beacon or probe, drop the frame.
526 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
527 struct ieee80211_mgmt
*mgmt
;
529 if (!ieee80211_is_mgmt(hdr
->frame_control
))
530 return RX_DROP_MONITOR
;
532 if (ieee80211_is_action(hdr
->frame_control
)) {
534 mgmt
= (struct ieee80211_mgmt
*)hdr
;
535 category
= mgmt
->u
.action
.category
;
536 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
537 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
538 return RX_DROP_MONITOR
;
542 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
543 ieee80211_is_probe_resp(hdr
->frame_control
) ||
544 ieee80211_is_beacon(hdr
->frame_control
) ||
545 ieee80211_is_auth(hdr
->frame_control
))
548 return RX_DROP_MONITOR
;
555 #define SEQ_MODULO 0x1000
556 #define SEQ_MASK 0xfff
558 static inline int seq_less(u16 sq1
, u16 sq2
)
560 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
563 static inline u16
seq_inc(u16 sq
)
565 return (sq
+ 1) & SEQ_MASK
;
568 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
570 return (sq1
- sq2
) & SEQ_MASK
;
574 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
575 struct tid_ampdu_rx
*tid_agg_rx
,
578 struct ieee80211_local
*local
= sdata
->local
;
579 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
580 struct ieee80211_rx_status
*status
;
582 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
587 /* release the frame from the reorder ring buffer */
588 tid_agg_rx
->stored_mpdu_num
--;
589 tid_agg_rx
->reorder_buf
[index
] = NULL
;
590 status
= IEEE80211_SKB_RXCB(skb
);
591 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
592 skb_queue_tail(&local
->rx_skb_queue
, skb
);
595 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
598 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
599 struct tid_ampdu_rx
*tid_agg_rx
,
604 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
606 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
607 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
608 tid_agg_rx
->buf_size
;
609 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
);
614 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
615 * the skb was added to the buffer longer than this time ago, the earlier
616 * frames that have not yet been received are assumed to be lost and the skb
617 * can be released for processing. This may also release other skb's from the
618 * reorder buffer if there are no additional gaps between the frames.
620 * Callers must hold tid_agg_rx->reorder_lock.
622 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
624 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
625 struct tid_ampdu_rx
*tid_agg_rx
)
629 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
631 /* release the buffer until next missing frame */
632 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
633 tid_agg_rx
->buf_size
;
634 if (!tid_agg_rx
->reorder_buf
[index
] &&
635 tid_agg_rx
->stored_mpdu_num
) {
637 * No buffers ready to be released, but check whether any
638 * frames in the reorder buffer have timed out.
641 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
642 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
643 if (!tid_agg_rx
->reorder_buf
[j
]) {
648 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
649 HT_RX_REORDER_BUF_TIMEOUT
))
650 goto set_release_timer
;
652 ht_dbg_ratelimited(sdata
,
653 "release an RX reorder frame due to timeout on earlier frames\n");
654 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
);
657 * Increment the head seq# also for the skipped slots.
659 tid_agg_rx
->head_seq_num
=
660 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
663 } else while (tid_agg_rx
->reorder_buf
[index
]) {
664 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
);
665 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
666 tid_agg_rx
->buf_size
;
669 if (tid_agg_rx
->stored_mpdu_num
) {
670 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
671 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
673 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
674 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
675 if (tid_agg_rx
->reorder_buf
[j
])
681 mod_timer(&tid_agg_rx
->reorder_timer
,
682 tid_agg_rx
->reorder_time
[j
] + 1 +
683 HT_RX_REORDER_BUF_TIMEOUT
);
685 del_timer(&tid_agg_rx
->reorder_timer
);
690 * As this function belongs to the RX path it must be under
691 * rcu_read_lock protection. It returns false if the frame
692 * can be processed immediately, true if it was consumed.
694 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
695 struct tid_ampdu_rx
*tid_agg_rx
,
698 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
699 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
700 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
701 u16 head_seq_num
, buf_size
;
705 spin_lock(&tid_agg_rx
->reorder_lock
);
707 buf_size
= tid_agg_rx
->buf_size
;
708 head_seq_num
= tid_agg_rx
->head_seq_num
;
710 /* frame with out of date sequence number */
711 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
717 * If frame the sequence number exceeds our buffering window
718 * size release some previous frames to make room for this one.
720 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
721 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
722 /* release stored frames up to new head to stack */
723 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
727 /* Now the new frame is always in the range of the reordering buffer */
729 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
731 /* check if we already stored this frame */
732 if (tid_agg_rx
->reorder_buf
[index
]) {
738 * If the current MPDU is in the right order and nothing else
739 * is stored we can process it directly, no need to buffer it.
740 * If it is first but there's something stored, we may be able
741 * to release frames after this one.
743 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
744 tid_agg_rx
->stored_mpdu_num
== 0) {
745 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
750 /* put the frame in the reordering buffer */
751 tid_agg_rx
->reorder_buf
[index
] = skb
;
752 tid_agg_rx
->reorder_time
[index
] = jiffies
;
753 tid_agg_rx
->stored_mpdu_num
++;
754 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
);
757 spin_unlock(&tid_agg_rx
->reorder_lock
);
762 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
763 * true if the MPDU was buffered, false if it should be processed.
765 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
767 struct sk_buff
*skb
= rx
->skb
;
768 struct ieee80211_local
*local
= rx
->local
;
769 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
770 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
771 struct sta_info
*sta
= rx
->sta
;
772 struct tid_ampdu_rx
*tid_agg_rx
;
776 if (!ieee80211_is_data_qos(hdr
->frame_control
))
780 * filter the QoS data rx stream according to
781 * STA/TID and check if this STA/TID is on aggregation
787 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
788 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
789 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
791 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
795 /* qos null data frames are excluded */
796 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
799 /* not part of a BA session */
800 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
801 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
804 /* not actually part of this BA session */
805 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
808 /* new, potentially un-ordered, ampdu frame - process it */
810 /* reset session timer */
811 if (tid_agg_rx
->timeout
)
812 tid_agg_rx
->last_rx
= jiffies
;
814 /* if this mpdu is fragmented - terminate rx aggregation session */
815 sc
= le16_to_cpu(hdr
->seq_ctrl
);
816 if (sc
& IEEE80211_SCTL_FRAG
) {
817 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
818 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
819 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
824 * No locking needed -- we will only ever process one
825 * RX packet at a time, and thus own tid_agg_rx. All
826 * other code manipulating it needs to (and does) make
827 * sure that we cannot get to it any more before doing
830 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
))
834 skb_queue_tail(&local
->rx_skb_queue
, skb
);
837 static ieee80211_rx_result debug_noinline
838 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
840 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
841 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
843 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
844 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
845 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
846 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
848 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
849 rx
->local
->dot11FrameDuplicateCount
++;
850 rx
->sta
->num_duplicates
++;
852 return RX_DROP_UNUSABLE
;
854 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
857 if (unlikely(rx
->skb
->len
< 16)) {
858 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
859 return RX_DROP_MONITOR
;
862 /* Drop disallowed frame classes based on STA auth/assoc state;
863 * IEEE 802.11, Chap 5.5.
865 * mac80211 filters only based on association state, i.e. it drops
866 * Class 3 frames from not associated stations. hostapd sends
867 * deauth/disassoc frames when needed. In addition, hostapd is
868 * responsible for filtering on both auth and assoc states.
871 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
872 return ieee80211_rx_mesh_check(rx
);
874 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
875 ieee80211_is_pspoll(hdr
->frame_control
)) &&
876 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
877 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
878 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
880 * accept port control frames from the AP even when it's not
881 * yet marked ASSOC to prevent a race where we don't set the
882 * assoc bit quickly enough before it sends the first frame
884 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
885 ieee80211_is_data_present(hdr
->frame_control
)) {
889 payload
= rx
->skb
->data
+
890 ieee80211_hdrlen(hdr
->frame_control
);
891 ethertype
= (payload
[6] << 8) | payload
[7];
892 if (cpu_to_be16(ethertype
) ==
893 rx
->sdata
->control_port_protocol
)
897 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
898 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
901 return RX_DROP_UNUSABLE
;
903 return RX_DROP_MONITOR
;
910 static ieee80211_rx_result debug_noinline
911 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
913 struct sk_buff
*skb
= rx
->skb
;
914 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
915 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
918 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
919 struct ieee80211_key
*sta_ptk
= NULL
;
920 int mmie_keyidx
= -1;
926 * There are four types of keys:
928 * - IGTK (group keys for management frames)
929 * - PTK (pairwise keys)
930 * - STK (station-to-station pairwise keys)
932 * When selecting a key, we have to distinguish between multicast
933 * (including broadcast) and unicast frames, the latter can only
934 * use PTKs and STKs while the former always use GTKs and IGTKs.
935 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
936 * unicast frames can also use key indices like GTKs. Hence, if we
937 * don't have a PTK/STK we check the key index for a WEP key.
939 * Note that in a regular BSS, multicast frames are sent by the
940 * AP only, associated stations unicast the frame to the AP first
941 * which then multicasts it on their behalf.
943 * There is also a slight problem in IBSS mode: GTKs are negotiated
944 * with each station, that is something we don't currently handle.
945 * The spec seems to expect that one negotiates the same key with
946 * every station but there's no such requirement; VLANs could be
951 * No point in finding a key and decrypting if the frame is neither
952 * addressed to us nor a multicast frame.
954 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
957 /* start without a key */
961 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
963 fc
= hdr
->frame_control
;
965 if (!ieee80211_has_protected(fc
))
966 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
968 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
970 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
971 (status
->flag
& RX_FLAG_IV_STRIPPED
))
973 /* Skip decryption if the frame is not protected. */
974 if (!ieee80211_has_protected(fc
))
976 } else if (mmie_keyidx
>= 0) {
977 /* Broadcast/multicast robust management frame / BIP */
978 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
979 (status
->flag
& RX_FLAG_IV_STRIPPED
))
982 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
983 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
984 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
986 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
988 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
989 } else if (!ieee80211_has_protected(fc
)) {
991 * The frame was not protected, so skip decryption. However, we
992 * need to set rx->key if there is a key that could have been
993 * used so that the frame may be dropped if encryption would
994 * have been expected.
996 struct ieee80211_key
*key
= NULL
;
997 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1000 if (ieee80211_is_mgmt(fc
) &&
1001 is_multicast_ether_addr(hdr
->addr1
) &&
1002 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
1006 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1007 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
1013 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1014 key
= rcu_dereference(sdata
->keys
[i
]);
1026 * The device doesn't give us the IV so we won't be
1027 * able to look up the key. That's ok though, we
1028 * don't need to decrypt the frame, we just won't
1029 * be able to keep statistics accurate.
1030 * Except for key threshold notifications, should
1031 * we somehow allow the driver to tell us which key
1032 * the hardware used if this flag is set?
1034 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1035 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1038 hdrlen
= ieee80211_hdrlen(fc
);
1040 if (rx
->skb
->len
< 8 + hdrlen
)
1041 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1044 * no need to call ieee80211_wep_get_keyidx,
1045 * it verifies a bunch of things we've done already
1047 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1048 keyidx
= keyid
>> 6;
1050 /* check per-station GTK first, if multicast packet */
1051 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1052 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1054 /* if not found, try default key */
1056 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1059 * RSNA-protected unicast frames should always be
1060 * sent with pairwise or station-to-station keys,
1061 * but for WEP we allow using a key index as well.
1064 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1065 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1066 !is_multicast_ether_addr(hdr
->addr1
))
1072 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1073 return RX_DROP_MONITOR
;
1075 rx
->key
->tx_rx_count
++;
1076 /* TODO: add threshold stuff again */
1078 return RX_DROP_MONITOR
;
1081 switch (rx
->key
->conf
.cipher
) {
1082 case WLAN_CIPHER_SUITE_WEP40
:
1083 case WLAN_CIPHER_SUITE_WEP104
:
1084 result
= ieee80211_crypto_wep_decrypt(rx
);
1086 case WLAN_CIPHER_SUITE_TKIP
:
1087 result
= ieee80211_crypto_tkip_decrypt(rx
);
1089 case WLAN_CIPHER_SUITE_CCMP
:
1090 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1092 case WLAN_CIPHER_SUITE_AES_CMAC
:
1093 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1097 * We can reach here only with HW-only algorithms
1098 * but why didn't it decrypt the frame?!
1100 return RX_DROP_UNUSABLE
;
1103 /* the hdr variable is invalid after the decrypt handlers */
1105 /* either the frame has been decrypted or will be dropped */
1106 status
->flag
|= RX_FLAG_DECRYPTED
;
1111 static ieee80211_rx_result debug_noinline
1112 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1114 struct ieee80211_local
*local
;
1115 struct ieee80211_hdr
*hdr
;
1116 struct sk_buff
*skb
;
1120 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1122 if (!local
->pspolling
)
1125 if (!ieee80211_has_fromds(hdr
->frame_control
))
1126 /* this is not from AP */
1129 if (!ieee80211_is_data(hdr
->frame_control
))
1132 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1133 /* AP has no more frames buffered for us */
1134 local
->pspolling
= false;
1138 /* more data bit is set, let's request a new frame from the AP */
1139 ieee80211_send_pspoll(local
, rx
->sdata
);
1144 static void ap_sta_ps_start(struct sta_info
*sta
)
1146 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1147 struct ieee80211_local
*local
= sdata
->local
;
1149 atomic_inc(&sdata
->bss
->num_sta_ps
);
1150 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1151 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1152 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1153 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1154 sta
->sta
.addr
, sta
->sta
.aid
);
1157 static void ap_sta_ps_end(struct sta_info
*sta
)
1159 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1160 sta
->sta
.addr
, sta
->sta
.aid
);
1162 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1163 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1164 sta
->sta
.addr
, sta
->sta
.aid
);
1168 ieee80211_sta_ps_deliver_wakeup(sta
);
1171 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1173 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1176 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1178 /* Don't let the same PS state be set twice */
1179 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1180 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1184 ap_sta_ps_start(sta_inf
);
1186 ap_sta_ps_end(sta_inf
);
1190 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1192 static ieee80211_rx_result debug_noinline
1193 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1195 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1196 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1197 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1200 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1203 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1204 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1208 * The device handles station powersave, so don't do anything about
1209 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1210 * it to mac80211 since they're handled.)
1212 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1216 * Don't do anything if the station isn't already asleep. In
1217 * the uAPSD case, the station will probably be marked asleep,
1218 * in the PS-Poll case the station must be confused ...
1220 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1223 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1224 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1225 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1226 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1228 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1231 /* Free PS Poll skb here instead of returning RX_DROP that would
1232 * count as an dropped frame. */
1233 dev_kfree_skb(rx
->skb
);
1236 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1237 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1238 ieee80211_has_pm(hdr
->frame_control
) &&
1239 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1240 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1241 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1242 ac
= ieee802_1d_to_ac
[tid
& 7];
1245 * If this AC is not trigger-enabled do nothing.
1247 * NB: This could/should check a separate bitmap of trigger-
1248 * enabled queues, but for now we only implement uAPSD w/o
1249 * TSPEC changes to the ACs, so they're always the same.
1251 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1254 /* if we are in a service period, do nothing */
1255 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1258 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1259 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1261 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1267 static ieee80211_rx_result debug_noinline
1268 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1270 struct sta_info
*sta
= rx
->sta
;
1271 struct sk_buff
*skb
= rx
->skb
;
1272 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1273 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1279 * Update last_rx only for IBSS packets which are for the current
1280 * BSSID to avoid keeping the current IBSS network alive in cases
1281 * where other STAs start using different BSSID.
1283 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1284 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1285 NL80211_IFTYPE_ADHOC
);
1286 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
)) {
1287 sta
->last_rx
= jiffies
;
1288 if (ieee80211_is_data(hdr
->frame_control
)) {
1289 sta
->last_rx_rate_idx
= status
->rate_idx
;
1290 sta
->last_rx_rate_flag
= status
->flag
;
1293 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1295 * Mesh beacons will update last_rx when if they are found to
1296 * match the current local configuration when processed.
1298 sta
->last_rx
= jiffies
;
1299 if (ieee80211_is_data(hdr
->frame_control
)) {
1300 sta
->last_rx_rate_idx
= status
->rate_idx
;
1301 sta
->last_rx_rate_flag
= status
->flag
;
1305 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1308 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1309 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1311 sta
->rx_fragments
++;
1312 sta
->rx_bytes
+= rx
->skb
->len
;
1313 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1314 sta
->last_signal
= status
->signal
;
1315 ewma_add(&sta
->avg_signal
, -status
->signal
);
1319 * Change STA power saving mode only at the end of a frame
1320 * exchange sequence.
1322 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1323 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1324 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1325 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1326 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1327 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1329 * Ignore doze->wake transitions that are
1330 * indicated by non-data frames, the standard
1331 * is unclear here, but for example going to
1332 * PS mode and then scanning would cause a
1333 * doze->wake transition for the probe request,
1334 * and that is clearly undesirable.
1336 if (ieee80211_is_data(hdr
->frame_control
) &&
1337 !ieee80211_has_pm(hdr
->frame_control
))
1340 if (ieee80211_has_pm(hdr
->frame_control
))
1341 ap_sta_ps_start(sta
);
1346 * Drop (qos-)data::nullfunc frames silently, since they
1347 * are used only to control station power saving mode.
1349 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1350 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1351 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1354 * If we receive a 4-addr nullfunc frame from a STA
1355 * that was not moved to a 4-addr STA vlan yet send
1356 * the event to userspace and for older hostapd drop
1357 * the frame to the monitor interface.
1359 if (ieee80211_has_a4(hdr
->frame_control
) &&
1360 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1361 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1362 !rx
->sdata
->u
.vlan
.sta
))) {
1363 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1364 cfg80211_rx_unexpected_4addr_frame(
1365 rx
->sdata
->dev
, sta
->sta
.addr
,
1367 return RX_DROP_MONITOR
;
1370 * Update counter and free packet here to avoid
1371 * counting this as a dropped packed.
1374 dev_kfree_skb(rx
->skb
);
1379 } /* ieee80211_rx_h_sta_process */
1381 static inline struct ieee80211_fragment_entry
*
1382 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1383 unsigned int frag
, unsigned int seq
, int rx_queue
,
1384 struct sk_buff
**skb
)
1386 struct ieee80211_fragment_entry
*entry
;
1389 idx
= sdata
->fragment_next
;
1390 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1391 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1392 sdata
->fragment_next
= 0;
1394 if (!skb_queue_empty(&entry
->skb_list
))
1395 __skb_queue_purge(&entry
->skb_list
);
1397 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1399 entry
->first_frag_time
= jiffies
;
1401 entry
->rx_queue
= rx_queue
;
1402 entry
->last_frag
= frag
;
1404 entry
->extra_len
= 0;
1409 static inline struct ieee80211_fragment_entry
*
1410 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1411 unsigned int frag
, unsigned int seq
,
1412 int rx_queue
, struct ieee80211_hdr
*hdr
)
1414 struct ieee80211_fragment_entry
*entry
;
1417 idx
= sdata
->fragment_next
;
1418 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1419 struct ieee80211_hdr
*f_hdr
;
1423 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1425 entry
= &sdata
->fragments
[idx
];
1426 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1427 entry
->rx_queue
!= rx_queue
||
1428 entry
->last_frag
+ 1 != frag
)
1431 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1434 * Check ftype and addresses are equal, else check next fragment
1436 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1437 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1438 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1439 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1442 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1443 __skb_queue_purge(&entry
->skb_list
);
1452 static ieee80211_rx_result debug_noinline
1453 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1455 struct ieee80211_hdr
*hdr
;
1458 unsigned int frag
, seq
;
1459 struct ieee80211_fragment_entry
*entry
;
1460 struct sk_buff
*skb
;
1461 struct ieee80211_rx_status
*status
;
1463 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1464 fc
= hdr
->frame_control
;
1465 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1466 frag
= sc
& IEEE80211_SCTL_FRAG
;
1468 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1469 (rx
->skb
)->len
< 24 ||
1470 is_multicast_ether_addr(hdr
->addr1
))) {
1471 /* not fragmented */
1474 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1476 if (skb_linearize(rx
->skb
))
1477 return RX_DROP_UNUSABLE
;
1480 * skb_linearize() might change the skb->data and
1481 * previously cached variables (in this case, hdr) need to
1482 * be refreshed with the new data.
1484 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1485 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1488 /* This is the first fragment of a new frame. */
1489 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1490 rx
->seqno_idx
, &(rx
->skb
));
1491 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1492 ieee80211_has_protected(fc
)) {
1493 int queue
= rx
->security_idx
;
1494 /* Store CCMP PN so that we can verify that the next
1495 * fragment has a sequential PN value. */
1497 memcpy(entry
->last_pn
,
1498 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1504 /* This is a fragment for a frame that should already be pending in
1505 * fragment cache. Add this fragment to the end of the pending entry.
1507 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1508 rx
->seqno_idx
, hdr
);
1510 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1511 return RX_DROP_MONITOR
;
1514 /* Verify that MPDUs within one MSDU have sequential PN values.
1515 * (IEEE 802.11i, 8.3.3.4.5) */
1518 u8 pn
[CCMP_PN_LEN
], *rpn
;
1520 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1521 return RX_DROP_UNUSABLE
;
1522 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1523 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1528 queue
= rx
->security_idx
;
1529 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1530 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1531 return RX_DROP_UNUSABLE
;
1532 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1535 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1536 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1537 entry
->last_frag
= frag
;
1538 entry
->extra_len
+= rx
->skb
->len
;
1539 if (ieee80211_has_morefrags(fc
)) {
1544 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1545 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1546 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1547 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1549 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1550 __skb_queue_purge(&entry
->skb_list
);
1551 return RX_DROP_UNUSABLE
;
1554 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1555 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1559 /* Complete frame has been reassembled - process it now */
1560 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1561 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1565 rx
->sta
->rx_packets
++;
1566 if (is_multicast_ether_addr(hdr
->addr1
))
1567 rx
->local
->dot11MulticastReceivedFrameCount
++;
1569 ieee80211_led_rx(rx
->local
);
1574 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1576 if (unlikely(!rx
->sta
||
1577 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1584 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1586 struct sk_buff
*skb
= rx
->skb
;
1587 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1590 * Pass through unencrypted frames if the hardware has
1591 * decrypted them already.
1593 if (status
->flag
& RX_FLAG_DECRYPTED
)
1596 /* Drop unencrypted frames if key is set. */
1597 if (unlikely(!ieee80211_has_protected(fc
) &&
1598 !ieee80211_is_nullfunc(fc
) &&
1599 ieee80211_is_data(fc
) &&
1600 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1607 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1609 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1610 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1611 __le16 fc
= hdr
->frame_control
;
1614 * Pass through unencrypted frames if the hardware has
1615 * decrypted them already.
1617 if (status
->flag
& RX_FLAG_DECRYPTED
)
1620 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1621 if (unlikely(!ieee80211_has_protected(fc
) &&
1622 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1624 if (ieee80211_is_deauth(fc
))
1625 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1628 else if (ieee80211_is_disassoc(fc
))
1629 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1634 /* BIP does not use Protected field, so need to check MMIE */
1635 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1636 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1637 if (ieee80211_is_deauth(fc
))
1638 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1641 else if (ieee80211_is_disassoc(fc
))
1642 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1648 * When using MFP, Action frames are not allowed prior to
1649 * having configured keys.
1651 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1652 ieee80211_is_robust_mgmt_frame(
1653 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1661 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1663 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1664 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1665 bool check_port_control
= false;
1666 struct ethhdr
*ehdr
;
1669 *port_control
= false;
1670 if (ieee80211_has_a4(hdr
->frame_control
) &&
1671 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1674 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1675 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1677 if (!sdata
->u
.mgd
.use_4addr
)
1680 check_port_control
= true;
1683 if (is_multicast_ether_addr(hdr
->addr1
) &&
1684 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1687 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1691 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1692 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1693 *port_control
= true;
1694 else if (check_port_control
)
1701 * requires that rx->skb is a frame with ethernet header
1703 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1705 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1706 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1707 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1710 * Allow EAPOL frames to us/the PAE group address regardless
1711 * of whether the frame was encrypted or not.
1713 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1714 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1715 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1718 if (ieee80211_802_1x_port_control(rx
) ||
1719 ieee80211_drop_unencrypted(rx
, fc
))
1726 * requires that rx->skb is a frame with ethernet header
1729 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1731 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1732 struct net_device
*dev
= sdata
->dev
;
1733 struct sk_buff
*skb
, *xmit_skb
;
1734 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1735 struct sta_info
*dsta
;
1736 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1741 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1742 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1743 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1744 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1745 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1746 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1748 * send multicast frames both to higher layers in
1749 * local net stack and back to the wireless medium
1751 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1753 net_info_ratelimited("%s: failed to clone multicast frame\n",
1756 dsta
= sta_info_get(sdata
, skb
->data
);
1759 * The destination station is associated to
1760 * this AP (in this VLAN), so send the frame
1761 * directly to it and do not pass it to local
1771 int align __maybe_unused
;
1773 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1775 * 'align' will only take the values 0 or 2 here
1776 * since all frames are required to be aligned
1777 * to 2-byte boundaries when being passed to
1778 * mac80211. That also explains the __skb_push()
1781 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1783 if (WARN_ON(skb_headroom(skb
) < 3)) {
1787 u8
*data
= skb
->data
;
1788 size_t len
= skb_headlen(skb
);
1790 memmove(skb
->data
, data
, len
);
1791 skb_set_tail_pointer(skb
, len
);
1797 /* deliver to local stack */
1798 skb
->protocol
= eth_type_trans(skb
, dev
);
1799 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1800 netif_receive_skb(skb
);
1806 * Send to wireless media and increase priority by 256 to
1807 * keep the received priority instead of reclassifying
1808 * the frame (see cfg80211_classify8021d).
1810 xmit_skb
->priority
+= 256;
1811 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1812 skb_reset_network_header(xmit_skb
);
1813 skb_reset_mac_header(xmit_skb
);
1814 dev_queue_xmit(xmit_skb
);
1818 static ieee80211_rx_result debug_noinline
1819 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1821 struct net_device
*dev
= rx
->sdata
->dev
;
1822 struct sk_buff
*skb
= rx
->skb
;
1823 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1824 __le16 fc
= hdr
->frame_control
;
1825 struct sk_buff_head frame_list
;
1826 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1828 if (unlikely(!ieee80211_is_data(fc
)))
1831 if (unlikely(!ieee80211_is_data_present(fc
)))
1832 return RX_DROP_MONITOR
;
1834 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1837 if (ieee80211_has_a4(hdr
->frame_control
) &&
1838 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1839 !rx
->sdata
->u
.vlan
.sta
)
1840 return RX_DROP_UNUSABLE
;
1842 if (is_multicast_ether_addr(hdr
->addr1
) &&
1843 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1844 rx
->sdata
->u
.vlan
.sta
) ||
1845 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1846 rx
->sdata
->u
.mgd
.use_4addr
)))
1847 return RX_DROP_UNUSABLE
;
1850 __skb_queue_head_init(&frame_list
);
1852 if (skb_linearize(skb
))
1853 return RX_DROP_UNUSABLE
;
1855 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1856 rx
->sdata
->vif
.type
,
1857 rx
->local
->hw
.extra_tx_headroom
, true);
1859 while (!skb_queue_empty(&frame_list
)) {
1860 rx
->skb
= __skb_dequeue(&frame_list
);
1862 if (!ieee80211_frame_allowed(rx
, fc
)) {
1863 dev_kfree_skb(rx
->skb
);
1866 dev
->stats
.rx_packets
++;
1867 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1869 ieee80211_deliver_skb(rx
);
1875 #ifdef CONFIG_MAC80211_MESH
1876 static ieee80211_rx_result
1877 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1879 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
1880 struct ieee80211_tx_info
*info
;
1881 struct ieee80211s_hdr
*mesh_hdr
;
1882 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1883 struct ieee80211_local
*local
= rx
->local
;
1884 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1885 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1886 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1887 __le16 reason
= cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD
);
1890 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1891 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1892 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1894 /* frame is in RMC, don't forward */
1895 if (ieee80211_is_data(hdr
->frame_control
) &&
1896 is_multicast_ether_addr(hdr
->addr1
) &&
1897 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1898 return RX_DROP_MONITOR
;
1900 if (!ieee80211_is_data(hdr
->frame_control
))
1904 return RX_DROP_MONITOR
;
1906 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1907 struct mesh_path
*mppath
;
1911 if (is_multicast_ether_addr(hdr
->addr1
)) {
1912 mpp_addr
= hdr
->addr3
;
1913 proxied_addr
= mesh_hdr
->eaddr1
;
1915 mpp_addr
= hdr
->addr4
;
1916 proxied_addr
= mesh_hdr
->eaddr2
;
1920 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1922 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1924 spin_lock_bh(&mppath
->state_lock
);
1925 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
1926 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1927 spin_unlock_bh(&mppath
->state_lock
);
1932 /* Frame has reached destination. Don't forward */
1933 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1934 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
1937 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
1938 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
1939 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
1940 return RX_DROP_MONITOR
;
1942 skb_set_queue_mapping(skb
, q
);
1944 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1947 if (!--mesh_hdr
->ttl
) {
1948 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
1949 return RX_DROP_MONITOR
;
1952 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
1955 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1957 net_info_ratelimited("%s: failed to clone mesh frame\n",
1962 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1963 info
= IEEE80211_SKB_CB(fwd_skb
);
1964 memset(info
, 0, sizeof(*info
));
1965 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1966 info
->control
.vif
= &rx
->sdata
->vif
;
1967 info
->control
.jiffies
= jiffies
;
1968 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1969 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
1970 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1971 } else if (!mesh_nexthop_lookup(fwd_skb
, sdata
)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
1974 /* unable to resolve next hop */
1975 mesh_path_error_tx(ifmsh
->mshcfg
.element_ttl
, fwd_hdr
->addr3
,
1976 0, reason
, fwd_hdr
->addr2
, sdata
);
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
1979 return RX_DROP_MONITOR
;
1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
1983 ieee80211_add_pending_skb(local
, fwd_skb
);
1985 if (is_multicast_ether_addr(hdr
->addr1
) ||
1986 sdata
->dev
->flags
& IFF_PROMISC
)
1989 return RX_DROP_MONITOR
;
1993 static ieee80211_rx_result debug_noinline
1994 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1996 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1997 struct ieee80211_local
*local
= rx
->local
;
1998 struct net_device
*dev
= sdata
->dev
;
1999 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2000 __le16 fc
= hdr
->frame_control
;
2004 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2007 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2008 return RX_DROP_MONITOR
;
2011 * Send unexpected-4addr-frame event to hostapd. For older versions,
2012 * also drop the frame to cooked monitor interfaces.
2014 if (ieee80211_has_a4(hdr
->frame_control
) &&
2015 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2017 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2018 cfg80211_rx_unexpected_4addr_frame(
2019 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2020 return RX_DROP_MONITOR
;
2023 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2025 return RX_DROP_UNUSABLE
;
2027 if (!ieee80211_frame_allowed(rx
, fc
))
2028 return RX_DROP_MONITOR
;
2030 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2031 unlikely(port_control
) && sdata
->bss
) {
2032 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2040 dev
->stats
.rx_packets
++;
2041 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2043 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2044 !is_multicast_ether_addr(
2045 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2046 (!local
->scanning
&&
2047 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2048 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2049 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2052 ieee80211_deliver_skb(rx
);
2057 static ieee80211_rx_result debug_noinline
2058 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2060 struct sk_buff
*skb
= rx
->skb
;
2061 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2062 struct tid_ampdu_rx
*tid_agg_rx
;
2066 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2069 if (ieee80211_is_back_req(bar
->frame_control
)) {
2071 __le16 control
, start_seq_num
;
2072 } __packed bar_data
;
2075 return RX_DROP_MONITOR
;
2077 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2078 &bar_data
, sizeof(bar_data
)))
2079 return RX_DROP_MONITOR
;
2081 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2083 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2085 return RX_DROP_MONITOR
;
2087 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2089 /* reset session timer */
2090 if (tid_agg_rx
->timeout
)
2091 mod_timer(&tid_agg_rx
->session_timer
,
2092 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2094 spin_lock(&tid_agg_rx
->reorder_lock
);
2095 /* release stored frames up to start of BAR */
2096 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2098 spin_unlock(&tid_agg_rx
->reorder_lock
);
2105 * After this point, we only want management frames,
2106 * so we can drop all remaining control frames to
2107 * cooked monitor interfaces.
2109 return RX_DROP_MONITOR
;
2112 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2113 struct ieee80211_mgmt
*mgmt
,
2116 struct ieee80211_local
*local
= sdata
->local
;
2117 struct sk_buff
*skb
;
2118 struct ieee80211_mgmt
*resp
;
2120 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2121 /* Not to own unicast address */
2125 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2126 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2127 /* Not from the current AP or not associated yet. */
2131 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2132 /* Too short SA Query request frame */
2136 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2140 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2141 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2142 memset(resp
, 0, 24);
2143 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2144 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2145 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2146 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2147 IEEE80211_STYPE_ACTION
);
2148 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2149 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2150 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2151 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2152 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2153 WLAN_SA_QUERY_TR_ID_LEN
);
2155 ieee80211_tx_skb(sdata
, skb
);
2158 static ieee80211_rx_result debug_noinline
2159 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2161 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2162 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2165 * From here on, look only at management frames.
2166 * Data and control frames are already handled,
2167 * and unknown (reserved) frames are useless.
2169 if (rx
->skb
->len
< 24)
2170 return RX_DROP_MONITOR
;
2172 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2173 return RX_DROP_MONITOR
;
2175 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2176 ieee80211_is_beacon(mgmt
->frame_control
) &&
2177 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2180 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2181 sig
= status
->signal
;
2183 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2184 rx
->skb
->data
, rx
->skb
->len
,
2185 status
->freq
, sig
, GFP_ATOMIC
);
2186 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2189 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2190 return RX_DROP_MONITOR
;
2192 if (ieee80211_drop_unencrypted_mgmt(rx
))
2193 return RX_DROP_UNUSABLE
;
2198 static ieee80211_rx_result debug_noinline
2199 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2201 struct ieee80211_local
*local
= rx
->local
;
2202 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2203 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2204 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2205 int len
= rx
->skb
->len
;
2207 if (!ieee80211_is_action(mgmt
->frame_control
))
2210 /* drop too small frames */
2211 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2212 return RX_DROP_UNUSABLE
;
2214 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2215 return RX_DROP_UNUSABLE
;
2217 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2218 return RX_DROP_UNUSABLE
;
2220 switch (mgmt
->u
.action
.category
) {
2221 case WLAN_CATEGORY_HT
:
2222 /* reject HT action frames from stations not supporting HT */
2223 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2226 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2227 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2228 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2229 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2230 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2233 /* verify action & smps_control are present */
2234 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2237 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2238 case WLAN_HT_ACTION_SMPS
: {
2239 struct ieee80211_supported_band
*sband
;
2242 /* convert to HT capability */
2243 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2244 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2245 smps
= WLAN_HT_CAP_SM_PS_DISABLED
;
2247 case WLAN_HT_SMPS_CONTROL_STATIC
:
2248 smps
= WLAN_HT_CAP_SM_PS_STATIC
;
2250 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2251 smps
= WLAN_HT_CAP_SM_PS_DYNAMIC
;
2256 smps
<<= IEEE80211_HT_CAP_SM_PS_SHIFT
;
2258 /* if no change do nothing */
2259 if ((rx
->sta
->sta
.ht_cap
.cap
&
2260 IEEE80211_HT_CAP_SM_PS
) == smps
)
2263 rx
->sta
->sta
.ht_cap
.cap
&= ~IEEE80211_HT_CAP_SM_PS
;
2264 rx
->sta
->sta
.ht_cap
.cap
|= smps
;
2266 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2268 rate_control_rate_update(local
, sband
, rx
->sta
,
2269 IEEE80211_RC_SMPS_CHANGED
);
2277 case WLAN_CATEGORY_BACK
:
2278 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2279 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2280 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2281 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2282 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2285 /* verify action_code is present */
2286 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2289 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2290 case WLAN_ACTION_ADDBA_REQ
:
2291 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2292 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2295 case WLAN_ACTION_ADDBA_RESP
:
2296 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2297 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2300 case WLAN_ACTION_DELBA
:
2301 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2302 sizeof(mgmt
->u
.action
.u
.delba
)))
2310 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2311 if (status
->band
!= IEEE80211_BAND_5GHZ
)
2314 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2317 /* verify action_code is present */
2318 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2321 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2322 case WLAN_ACTION_SPCT_MSR_REQ
:
2323 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2324 sizeof(mgmt
->u
.action
.u
.measurement
)))
2326 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2328 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2329 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2330 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2333 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2336 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2342 case WLAN_CATEGORY_SA_QUERY
:
2343 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2344 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2347 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2348 case WLAN_ACTION_SA_QUERY_REQUEST
:
2349 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2351 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2355 case WLAN_CATEGORY_SELF_PROTECTED
:
2356 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2357 case WLAN_SP_MESH_PEERING_OPEN
:
2358 case WLAN_SP_MESH_PEERING_CLOSE
:
2359 case WLAN_SP_MESH_PEERING_CONFIRM
:
2360 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2362 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2363 /* userspace handles this frame */
2366 case WLAN_SP_MGK_INFORM
:
2367 case WLAN_SP_MGK_ACK
:
2368 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2373 case WLAN_CATEGORY_MESH_ACTION
:
2374 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2376 if (mesh_action_is_path_sel(mgmt
) &&
2377 (!mesh_path_sel_is_hwmp(sdata
)))
2385 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2386 /* will return in the next handlers */
2391 rx
->sta
->rx_packets
++;
2392 dev_kfree_skb(rx
->skb
);
2396 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2397 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2398 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2400 rx
->sta
->rx_packets
++;
2404 static ieee80211_rx_result debug_noinline
2405 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2407 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2410 /* skip known-bad action frames and return them in the next handler */
2411 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2415 * Getting here means the kernel doesn't know how to handle
2416 * it, but maybe userspace does ... include returned frames
2417 * so userspace can register for those to know whether ones
2418 * it transmitted were processed or returned.
2421 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2422 sig
= status
->signal
;
2424 if (cfg80211_rx_mgmt(&rx
->sdata
->wdev
, status
->freq
, sig
,
2425 rx
->skb
->data
, rx
->skb
->len
,
2428 rx
->sta
->rx_packets
++;
2429 dev_kfree_skb(rx
->skb
);
2437 static ieee80211_rx_result debug_noinline
2438 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2440 struct ieee80211_local
*local
= rx
->local
;
2441 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2442 struct sk_buff
*nskb
;
2443 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2444 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2446 if (!ieee80211_is_action(mgmt
->frame_control
))
2450 * For AP mode, hostapd is responsible for handling any action
2451 * frames that we didn't handle, including returning unknown
2452 * ones. For all other modes we will return them to the sender,
2453 * setting the 0x80 bit in the action category, as required by
2454 * 802.11-2012 9.24.4.
2455 * Newer versions of hostapd shall also use the management frame
2456 * registration mechanisms, but older ones still use cooked
2457 * monitor interfaces so push all frames there.
2459 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2460 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2461 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2462 return RX_DROP_MONITOR
;
2464 if (is_multicast_ether_addr(mgmt
->da
))
2465 return RX_DROP_MONITOR
;
2467 /* do not return rejected action frames */
2468 if (mgmt
->u
.action
.category
& 0x80)
2469 return RX_DROP_UNUSABLE
;
2471 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2474 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2476 nmgmt
->u
.action
.category
|= 0x80;
2477 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2478 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2480 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2482 ieee80211_tx_skb(rx
->sdata
, nskb
);
2484 dev_kfree_skb(rx
->skb
);
2488 static ieee80211_rx_result debug_noinline
2489 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2491 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2492 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2495 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2497 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2498 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2499 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2500 return RX_DROP_MONITOR
;
2503 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2504 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2505 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2506 /* process for all: mesh, mlme, ibss */
2508 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2509 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2510 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2511 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2512 if (is_multicast_ether_addr(mgmt
->da
) &&
2513 !is_broadcast_ether_addr(mgmt
->da
))
2514 return RX_DROP_MONITOR
;
2516 /* process only for station */
2517 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2518 return RX_DROP_MONITOR
;
2520 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2521 /* process only for ibss */
2522 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2523 return RX_DROP_MONITOR
;
2526 return RX_DROP_MONITOR
;
2529 /* queue up frame and kick off work to process it */
2530 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2531 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2532 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2534 rx
->sta
->rx_packets
++;
2539 /* TODO: use IEEE80211_RX_FRAGMENTED */
2540 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2541 struct ieee80211_rate
*rate
)
2543 struct ieee80211_sub_if_data
*sdata
;
2544 struct ieee80211_local
*local
= rx
->local
;
2545 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2546 struct net_device
*prev_dev
= NULL
;
2547 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2548 int needed_headroom
;
2551 * If cooked monitor has been processed already, then
2552 * don't do it again. If not, set the flag.
2554 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2556 rx
->flags
|= IEEE80211_RX_CMNTR
;
2558 /* If there are no cooked monitor interfaces, just free the SKB */
2559 if (!local
->cooked_mntrs
)
2562 /* room for the radiotap header based on driver features */
2563 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
2565 if (skb_headroom(skb
) < needed_headroom
&&
2566 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2569 /* prepend radiotap information */
2570 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2573 skb_set_mac_header(skb
, 0);
2574 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2575 skb
->pkt_type
= PACKET_OTHERHOST
;
2576 skb
->protocol
= htons(ETH_P_802_2
);
2578 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2579 if (!ieee80211_sdata_running(sdata
))
2582 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2583 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2587 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2589 skb2
->dev
= prev_dev
;
2590 netif_receive_skb(skb2
);
2594 prev_dev
= sdata
->dev
;
2595 sdata
->dev
->stats
.rx_packets
++;
2596 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2600 skb
->dev
= prev_dev
;
2601 netif_receive_skb(skb
);
2609 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2610 ieee80211_rx_result res
)
2613 case RX_DROP_MONITOR
:
2614 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2616 rx
->sta
->rx_dropped
++;
2619 struct ieee80211_rate
*rate
= NULL
;
2620 struct ieee80211_supported_band
*sband
;
2621 struct ieee80211_rx_status
*status
;
2623 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2625 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2626 if (!(status
->flag
& RX_FLAG_HT
))
2627 rate
= &sband
->bitrates
[status
->rate_idx
];
2629 ieee80211_rx_cooked_monitor(rx
, rate
);
2632 case RX_DROP_UNUSABLE
:
2633 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2635 rx
->sta
->rx_dropped
++;
2636 dev_kfree_skb(rx
->skb
);
2639 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2644 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2646 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2647 struct sk_buff
*skb
;
2649 #define CALL_RXH(rxh) \
2652 if (res != RX_CONTINUE) \
2656 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2657 if (rx
->local
->running_rx_handler
)
2660 rx
->local
->running_rx_handler
= true;
2662 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2663 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2666 * all the other fields are valid across frames
2667 * that belong to an aMPDU since they are on the
2668 * same TID from the same station
2672 CALL_RXH(ieee80211_rx_h_decrypt
)
2673 CALL_RXH(ieee80211_rx_h_check_more_data
)
2674 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2675 CALL_RXH(ieee80211_rx_h_sta_process
)
2676 CALL_RXH(ieee80211_rx_h_defragment
)
2677 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2678 /* must be after MMIC verify so header is counted in MPDU mic */
2679 #ifdef CONFIG_MAC80211_MESH
2680 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2681 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2683 CALL_RXH(ieee80211_rx_h_amsdu
)
2684 CALL_RXH(ieee80211_rx_h_data
)
2685 CALL_RXH(ieee80211_rx_h_ctrl
);
2686 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2687 CALL_RXH(ieee80211_rx_h_action
)
2688 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2689 CALL_RXH(ieee80211_rx_h_action_return
)
2690 CALL_RXH(ieee80211_rx_h_mgmt
)
2693 ieee80211_rx_handlers_result(rx
, res
);
2694 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2698 rx
->local
->running_rx_handler
= false;
2701 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2704 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2706 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2708 #define CALL_RXH(rxh) \
2711 if (res != RX_CONTINUE) \
2715 CALL_RXH(ieee80211_rx_h_check
)
2717 ieee80211_rx_reorder_ampdu(rx
);
2719 ieee80211_rx_handlers(rx
);
2723 ieee80211_rx_handlers_result(rx
, res
);
2729 * This function makes calls into the RX path, therefore
2730 * it has to be invoked under RCU read lock.
2732 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2734 struct ieee80211_rx_data rx
= {
2736 .sdata
= sta
->sdata
,
2737 .local
= sta
->local
,
2738 /* This is OK -- must be QoS data frame */
2739 .security_idx
= tid
,
2743 struct tid_ampdu_rx
*tid_agg_rx
;
2745 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2749 spin_lock(&tid_agg_rx
->reorder_lock
);
2750 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
);
2751 spin_unlock(&tid_agg_rx
->reorder_lock
);
2753 ieee80211_rx_handlers(&rx
);
2756 /* main receive path */
2758 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2759 struct ieee80211_hdr
*hdr
)
2761 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2762 struct sk_buff
*skb
= rx
->skb
;
2763 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2764 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2765 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2767 switch (sdata
->vif
.type
) {
2768 case NL80211_IFTYPE_STATION
:
2769 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2772 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2773 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2774 sdata
->u
.mgd
.use_4addr
)
2776 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2779 case NL80211_IFTYPE_ADHOC
:
2782 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2784 } else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2786 } else if (!multicast
&&
2787 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2788 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2790 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2791 } else if (!rx
->sta
) {
2793 if (status
->flag
& RX_FLAG_HT
)
2794 rate_idx
= 0; /* TODO: HT rates */
2796 rate_idx
= status
->rate_idx
;
2797 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
2801 case NL80211_IFTYPE_MESH_POINT
:
2803 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2804 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2807 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2810 case NL80211_IFTYPE_AP_VLAN
:
2811 case NL80211_IFTYPE_AP
:
2813 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
2815 } else if (!ieee80211_bssid_match(bssid
, sdata
->vif
.addr
)) {
2817 * Accept public action frames even when the
2818 * BSSID doesn't match, this is used for P2P
2819 * and location updates. Note that mac80211
2820 * itself never looks at these frames.
2822 if (ieee80211_is_public_action(hdr
, skb
->len
))
2824 if (!ieee80211_is_beacon(hdr
->frame_control
))
2826 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2829 case NL80211_IFTYPE_WDS
:
2830 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2832 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2835 case NL80211_IFTYPE_P2P_DEVICE
:
2836 if (!ieee80211_is_public_action(hdr
, skb
->len
) &&
2837 !ieee80211_is_probe_req(hdr
->frame_control
) &&
2838 !ieee80211_is_probe_resp(hdr
->frame_control
) &&
2839 !ieee80211_is_beacon(hdr
->frame_control
))
2841 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
2842 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2845 /* should never get here */
2854 * This function returns whether or not the SKB
2855 * was destined for RX processing or not, which,
2856 * if consume is true, is equivalent to whether
2857 * or not the skb was consumed.
2859 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2860 struct sk_buff
*skb
, bool consume
)
2862 struct ieee80211_local
*local
= rx
->local
;
2863 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2864 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2865 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2869 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2870 prepares
= prepare_for_handlers(rx
, hdr
);
2876 skb
= skb_copy(skb
, GFP_ATOMIC
);
2878 if (net_ratelimit())
2879 wiphy_debug(local
->hw
.wiphy
,
2880 "failed to copy skb for %s\n",
2888 ieee80211_invoke_rx_handlers(rx
);
2893 * This is the actual Rx frames handler. as it blongs to Rx path it must
2894 * be called with rcu_read_lock protection.
2896 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2897 struct sk_buff
*skb
)
2899 struct ieee80211_local
*local
= hw_to_local(hw
);
2900 struct ieee80211_sub_if_data
*sdata
;
2901 struct ieee80211_hdr
*hdr
;
2903 struct ieee80211_rx_data rx
;
2904 struct ieee80211_sub_if_data
*prev
;
2905 struct sta_info
*sta
, *tmp
, *prev_sta
;
2908 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2909 memset(&rx
, 0, sizeof(rx
));
2913 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2914 local
->dot11ReceivedFragmentCount
++;
2916 if (ieee80211_is_mgmt(fc
))
2917 err
= skb_linearize(skb
);
2919 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2926 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2927 ieee80211_parse_qos(&rx
);
2928 ieee80211_verify_alignment(&rx
);
2930 if (unlikely(ieee80211_is_probe_resp(hdr
->frame_control
) ||
2931 ieee80211_is_beacon(hdr
->frame_control
)))
2932 ieee80211_scan_rx(local
, skb
);
2934 if (ieee80211_is_data(fc
)) {
2937 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2944 rx
.sdata
= prev_sta
->sdata
;
2945 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2952 rx
.sdata
= prev_sta
->sdata
;
2954 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2962 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2963 if (!ieee80211_sdata_running(sdata
))
2966 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2967 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2971 * frame is destined for this interface, but if it's
2972 * not also for the previous one we handle that after
2973 * the loop to avoid copying the SKB once too much
2981 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2983 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2989 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2992 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3001 * This is the receive path handler. It is called by a low level driver when an
3002 * 802.11 MPDU is received from the hardware.
3004 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3006 struct ieee80211_local
*local
= hw_to_local(hw
);
3007 struct ieee80211_rate
*rate
= NULL
;
3008 struct ieee80211_supported_band
*sband
;
3009 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3011 WARN_ON_ONCE(softirq_count() == 0);
3013 if (WARN_ON(status
->band
< 0 ||
3014 status
->band
>= IEEE80211_NUM_BANDS
))
3017 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3018 if (WARN_ON(!sband
))
3022 * If we're suspending, it is possible although not too likely
3023 * that we'd be receiving frames after having already partially
3024 * quiesced the stack. We can't process such frames then since
3025 * that might, for example, cause stations to be added or other
3026 * driver callbacks be invoked.
3028 if (unlikely(local
->quiescing
|| local
->suspended
))
3031 /* We might be during a HW reconfig, prevent Rx for the same reason */
3032 if (unlikely(local
->in_reconfig
))
3036 * The same happens when we're not even started,
3037 * but that's worth a warning.
3039 if (WARN_ON(!local
->started
))
3042 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3044 * Validate the rate, unless a PLCP error means that
3045 * we probably can't have a valid rate here anyway.
3048 if (status
->flag
& RX_FLAG_HT
) {
3050 * rate_idx is MCS index, which can be [0-76]
3053 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3055 * Anything else would be some sort of driver or
3056 * hardware error. The driver should catch hardware
3059 if (WARN((status
->rate_idx
< 0 ||
3060 status
->rate_idx
> 76),
3061 "Rate marked as an HT rate but passed "
3062 "status->rate_idx is not "
3063 "an MCS index [0-76]: %d (0x%02x)\n",
3068 if (WARN_ON(status
->rate_idx
< 0 ||
3069 status
->rate_idx
>= sband
->n_bitrates
))
3071 rate
= &sband
->bitrates
[status
->rate_idx
];
3075 status
->rx_flags
= 0;
3078 * key references and virtual interfaces are protected using RCU
3079 * and this requires that we are in a read-side RCU section during
3080 * receive processing
3085 * Frames with failed FCS/PLCP checksum are not returned,
3086 * all other frames are returned without radiotap header
3087 * if it was previously present.
3088 * Also, frames with less than 16 bytes are dropped.
3090 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3096 ieee80211_tpt_led_trig_rx(local
,
3097 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3099 __ieee80211_rx_handle_packet(hw
, skb
);
3107 EXPORT_SYMBOL(ieee80211_rx
);
3109 /* This is a version of the rx handler that can be called from hard irq
3110 * context. Post the skb on the queue and schedule the tasklet */
3111 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3113 struct ieee80211_local
*local
= hw_to_local(hw
);
3115 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3117 skb
->pkt_type
= IEEE80211_RX_MSG
;
3118 skb_queue_tail(&local
->skb_queue
, skb
);
3119 tasklet_schedule(&local
->tasklet
);
3121 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);