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
| RX_FLAG_FAILED_PLCP_CRC
))
65 if (unlikely(skb
->len
< 16 + present_fcs_len
))
67 if (ieee80211_is_ctl(hdr
->frame_control
) &&
68 !ieee80211_is_pspoll(hdr
->frame_control
) &&
69 !ieee80211_is_back_req(hdr
->frame_control
))
75 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
76 struct ieee80211_rx_status
*status
)
80 /* always present fields */
81 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
83 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
85 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
88 if (len
& 1) /* padding for RX_FLAGS if necessary */
91 if (status
->flag
& RX_FLAG_HT
) /* HT info */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
105 struct ieee80211_rate
*rate
,
106 int rtap_len
, bool has_fcs
)
108 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
109 struct ieee80211_radiotap_header
*rthdr
;
113 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
114 memset(rthdr
, 0, rtap_len
);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
122 rthdr
->it_len
= cpu_to_le16(rtap_len
);
124 pos
= (unsigned char *)(rthdr
+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
130 put_unaligned_le64(status
->mactime
, pos
);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (has_fcs
&& (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
))
138 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
139 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
140 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
141 if (status
->flag
& RX_FLAG_SHORTPRE
)
142 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (!rate
|| status
->flag
& RX_FLAG_HT
) {
148 * Without rate information don't add it. If we have,
149 * MCS information is a separate field in radiotap,
150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
155 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
156 *pos
= rate
->bitrate
/ 5;
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status
->freq
, pos
);
163 if (status
->band
== IEEE80211_BAND_5GHZ
)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
166 else if (status
->flag
& RX_FLAG_HT
)
167 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
169 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
173 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ
, pos
);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
181 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
182 *pos
= status
->signal
;
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos
= status
->antenna
;
194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
198 if ((pos
- (u8
*)rthdr
) & 1)
200 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
201 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
202 put_unaligned_le16(rx_flags
, pos
);
205 if (status
->flag
& RX_FLAG_HT
) {
206 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
207 *pos
++ = local
->hw
.radiotap_mcs_details
;
209 if (status
->flag
& RX_FLAG_SHORT_GI
)
210 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
211 if (status
->flag
& RX_FLAG_40MHZ
)
212 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
213 if (status
->flag
& RX_FLAG_HT_GF
)
214 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
216 *pos
++ = status
->rate_idx
;
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
225 static struct sk_buff
*
226 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
227 struct ieee80211_rate
*rate
)
229 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
230 struct ieee80211_sub_if_data
*sdata
;
232 struct sk_buff
*skb
, *skb2
;
233 struct net_device
*prev_dev
= NULL
;
234 int present_fcs_len
= 0;
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
245 /* room for the radiotap header based on driver features */
246 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
248 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
249 present_fcs_len
= FCS_LEN
;
251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb
, 2)) {
253 dev_kfree_skb(origskb
);
257 if (!local
->monitors
) {
258 if (should_drop_frame(origskb
, present_fcs_len
)) {
259 dev_kfree_skb(origskb
);
263 return remove_monitor_info(local
, origskb
);
266 if (should_drop_frame(origskb
, present_fcs_len
)) {
267 /* only need to expand headroom if necessary */
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
278 if (skb_headroom(skb
) < needed_headroom
&&
279 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
288 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
290 origskb
= remove_monitor_info(local
, origskb
);
296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
300 skb_reset_mac_header(skb
);
301 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
302 skb
->pkt_type
= PACKET_OTHERHOST
;
303 skb
->protocol
= htons(ETH_P_802_2
);
305 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
306 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
309 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
312 if (!ieee80211_sdata_running(sdata
))
316 skb2
= skb_clone(skb
, GFP_ATOMIC
);
318 skb2
->dev
= prev_dev
;
319 netif_receive_skb(skb2
);
323 prev_dev
= sdata
->dev
;
324 sdata
->dev
->stats
.rx_packets
++;
325 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
330 netif_receive_skb(skb
);
338 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
340 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
341 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
342 int tid
, seqno_idx
, security_idx
;
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
346 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
347 /* frame has qos control */
348 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
349 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
350 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
364 * We also use that counter for non-QoS STAs.
366 seqno_idx
= NUM_RX_DATA_QUEUES
;
368 if (ieee80211_is_mgmt(hdr
->frame_control
))
369 security_idx
= NUM_RX_DATA_QUEUES
;
373 rx
->seqno_idx
= seqno_idx
;
374 rx
->security_idx
= security_idx
;
375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
381 * DOC: Packet alignment
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
401 * Padding like Atheros hardware adds which is between the 802.11 header and
402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
405 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
409 "unaligned packet at 0x%p\n", rx
->skb
->data
);
416 static ieee80211_rx_result debug_noinline
417 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
419 struct ieee80211_local
*local
= rx
->local
;
420 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
421 struct sk_buff
*skb
= rx
->skb
;
423 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
424 !local
->sched_scanning
))
427 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
428 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
429 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
430 local
->sched_scanning
)
431 return ieee80211_scan_rx(rx
->sdata
, skb
);
433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
435 return RX_DROP_UNUSABLE
;
439 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
441 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
443 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
446 return ieee80211_is_robust_mgmt_frame(hdr
);
450 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
452 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
454 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
457 return ieee80211_is_robust_mgmt_frame(hdr
);
461 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
462 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
464 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
465 struct ieee80211_mmie
*mmie
;
467 if (skb
->len
< 24 + sizeof(*mmie
) ||
468 !is_multicast_ether_addr(hdr
->da
))
471 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
472 return -1; /* not a robust management frame */
474 mmie
= (struct ieee80211_mmie
*)
475 (skb
->data
+ skb
->len
- sizeof(*mmie
));
476 if (mmie
->element_id
!= WLAN_EID_MMIE
||
477 mmie
->length
!= sizeof(*mmie
) - 2)
480 return le16_to_cpu(mmie
->key_id
);
484 static ieee80211_rx_result
485 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
487 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
488 char *dev_addr
= rx
->sdata
->vif
.addr
;
490 if (ieee80211_is_data(hdr
->frame_control
)) {
491 if (is_multicast_ether_addr(hdr
->addr1
)) {
492 if (ieee80211_has_tods(hdr
->frame_control
) ||
493 !ieee80211_has_fromds(hdr
->frame_control
))
494 return RX_DROP_MONITOR
;
495 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
496 return RX_DROP_MONITOR
;
498 if (!ieee80211_has_a4(hdr
->frame_control
))
499 return RX_DROP_MONITOR
;
500 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
501 return RX_DROP_MONITOR
;
505 /* If there is not an established peer link and this is not a peer link
506 * establisment frame, beacon or probe, drop the frame.
509 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
510 struct ieee80211_mgmt
*mgmt
;
512 if (!ieee80211_is_mgmt(hdr
->frame_control
))
513 return RX_DROP_MONITOR
;
515 if (ieee80211_is_action(hdr
->frame_control
)) {
517 mgmt
= (struct ieee80211_mgmt
*)hdr
;
518 category
= mgmt
->u
.action
.category
;
519 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
520 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
521 return RX_DROP_MONITOR
;
525 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
526 ieee80211_is_probe_resp(hdr
->frame_control
) ||
527 ieee80211_is_beacon(hdr
->frame_control
) ||
528 ieee80211_is_auth(hdr
->frame_control
))
531 return RX_DROP_MONITOR
;
538 #define SEQ_MODULO 0x1000
539 #define SEQ_MASK 0xfff
541 static inline int seq_less(u16 sq1
, u16 sq2
)
543 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
546 static inline u16
seq_inc(u16 sq
)
548 return (sq
+ 1) & SEQ_MASK
;
551 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
553 return (sq1
- sq2
) & SEQ_MASK
;
557 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data
*sdata
,
558 struct tid_ampdu_rx
*tid_agg_rx
,
561 struct ieee80211_local
*local
= sdata
->local
;
562 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
563 struct ieee80211_rx_status
*status
;
565 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
570 /* release the frame from the reorder ring buffer */
571 tid_agg_rx
->stored_mpdu_num
--;
572 tid_agg_rx
->reorder_buf
[index
] = NULL
;
573 status
= IEEE80211_SKB_RXCB(skb
);
574 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
575 skb_queue_tail(&local
->rx_skb_queue
, skb
);
578 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
581 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data
*sdata
,
582 struct tid_ampdu_rx
*tid_agg_rx
,
587 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
589 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
590 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
591 tid_agg_rx
->buf_size
;
592 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
);
597 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
598 * the skb was added to the buffer longer than this time ago, the earlier
599 * frames that have not yet been received are assumed to be lost and the skb
600 * can be released for processing. This may also release other skb's from the
601 * reorder buffer if there are no additional gaps between the frames.
603 * Callers must hold tid_agg_rx->reorder_lock.
605 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
607 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data
*sdata
,
608 struct tid_ampdu_rx
*tid_agg_rx
)
612 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
614 /* release the buffer until next missing frame */
615 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
616 tid_agg_rx
->buf_size
;
617 if (!tid_agg_rx
->reorder_buf
[index
] &&
618 tid_agg_rx
->stored_mpdu_num
) {
620 * No buffers ready to be released, but check whether any
621 * frames in the reorder buffer have timed out.
624 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
625 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
626 if (!tid_agg_rx
->reorder_buf
[j
]) {
631 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
632 HT_RX_REORDER_BUF_TIMEOUT
))
633 goto set_release_timer
;
635 ht_dbg_ratelimited(sdata
,
636 "release an RX reorder frame due to timeout on earlier frames\n");
637 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, j
);
640 * Increment the head seq# also for the skipped slots.
642 tid_agg_rx
->head_seq_num
=
643 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
646 } else while (tid_agg_rx
->reorder_buf
[index
]) {
647 ieee80211_release_reorder_frame(sdata
, tid_agg_rx
, index
);
648 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
649 tid_agg_rx
->buf_size
;
652 if (tid_agg_rx
->stored_mpdu_num
) {
653 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
654 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
656 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
657 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
658 if (tid_agg_rx
->reorder_buf
[j
])
664 mod_timer(&tid_agg_rx
->reorder_timer
,
665 tid_agg_rx
->reorder_time
[j
] + 1 +
666 HT_RX_REORDER_BUF_TIMEOUT
);
668 del_timer(&tid_agg_rx
->reorder_timer
);
673 * As this function belongs to the RX path it must be under
674 * rcu_read_lock protection. It returns false if the frame
675 * can be processed immediately, true if it was consumed.
677 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data
*sdata
,
678 struct tid_ampdu_rx
*tid_agg_rx
,
681 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
682 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
683 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
684 u16 head_seq_num
, buf_size
;
688 spin_lock(&tid_agg_rx
->reorder_lock
);
690 buf_size
= tid_agg_rx
->buf_size
;
691 head_seq_num
= tid_agg_rx
->head_seq_num
;
693 /* frame with out of date sequence number */
694 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
700 * If frame the sequence number exceeds our buffering window
701 * size release some previous frames to make room for this one.
703 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
704 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
705 /* release stored frames up to new head to stack */
706 ieee80211_release_reorder_frames(sdata
, tid_agg_rx
,
710 /* Now the new frame is always in the range of the reordering buffer */
712 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
714 /* check if we already stored this frame */
715 if (tid_agg_rx
->reorder_buf
[index
]) {
721 * If the current MPDU is in the right order and nothing else
722 * is stored we can process it directly, no need to buffer it.
723 * If it is first but there's something stored, we may be able
724 * to release frames after this one.
726 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
727 tid_agg_rx
->stored_mpdu_num
== 0) {
728 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
733 /* put the frame in the reordering buffer */
734 tid_agg_rx
->reorder_buf
[index
] = skb
;
735 tid_agg_rx
->reorder_time
[index
] = jiffies
;
736 tid_agg_rx
->stored_mpdu_num
++;
737 ieee80211_sta_reorder_release(sdata
, tid_agg_rx
);
740 spin_unlock(&tid_agg_rx
->reorder_lock
);
745 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
746 * true if the MPDU was buffered, false if it should be processed.
748 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
750 struct sk_buff
*skb
= rx
->skb
;
751 struct ieee80211_local
*local
= rx
->local
;
752 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
753 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
754 struct sta_info
*sta
= rx
->sta
;
755 struct tid_ampdu_rx
*tid_agg_rx
;
759 if (!ieee80211_is_data_qos(hdr
->frame_control
))
763 * filter the QoS data rx stream according to
764 * STA/TID and check if this STA/TID is on aggregation
770 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
771 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
772 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
774 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
778 /* qos null data frames are excluded */
779 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
782 /* not part of a BA session */
783 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
784 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
787 /* not actually part of this BA session */
788 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
791 /* new, potentially un-ordered, ampdu frame - process it */
793 /* reset session timer */
794 if (tid_agg_rx
->timeout
)
795 tid_agg_rx
->last_rx
= jiffies
;
797 /* if this mpdu is fragmented - terminate rx aggregation session */
798 sc
= le16_to_cpu(hdr
->seq_ctrl
);
799 if (sc
& IEEE80211_SCTL_FRAG
) {
800 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
801 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
802 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
807 * No locking needed -- we will only ever process one
808 * RX packet at a time, and thus own tid_agg_rx. All
809 * other code manipulating it needs to (and does) make
810 * sure that we cannot get to it any more before doing
813 if (ieee80211_sta_manage_reorder_buf(rx
->sdata
, tid_agg_rx
, skb
))
817 skb_queue_tail(&local
->rx_skb_queue
, skb
);
820 static ieee80211_rx_result debug_noinline
821 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
823 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
824 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
826 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
827 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
828 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
829 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
831 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
832 rx
->local
->dot11FrameDuplicateCount
++;
833 rx
->sta
->num_duplicates
++;
835 return RX_DROP_UNUSABLE
;
837 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
840 if (unlikely(rx
->skb
->len
< 16)) {
841 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
842 return RX_DROP_MONITOR
;
845 /* Drop disallowed frame classes based on STA auth/assoc state;
846 * IEEE 802.11, Chap 5.5.
848 * mac80211 filters only based on association state, i.e. it drops
849 * Class 3 frames from not associated stations. hostapd sends
850 * deauth/disassoc frames when needed. In addition, hostapd is
851 * responsible for filtering on both auth and assoc states.
854 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
855 return ieee80211_rx_mesh_check(rx
);
857 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
858 ieee80211_is_pspoll(hdr
->frame_control
)) &&
859 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
860 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
861 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
863 * accept port control frames from the AP even when it's not
864 * yet marked ASSOC to prevent a race where we don't set the
865 * assoc bit quickly enough before it sends the first frame
867 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
868 ieee80211_is_data_present(hdr
->frame_control
)) {
872 payload
= rx
->skb
->data
+
873 ieee80211_hdrlen(hdr
->frame_control
);
874 ethertype
= (payload
[6] << 8) | payload
[7];
875 if (cpu_to_be16(ethertype
) ==
876 rx
->sdata
->control_port_protocol
)
880 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
881 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
884 return RX_DROP_UNUSABLE
;
886 return RX_DROP_MONITOR
;
893 static ieee80211_rx_result debug_noinline
894 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
896 struct sk_buff
*skb
= rx
->skb
;
897 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
898 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
901 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
902 struct ieee80211_key
*sta_ptk
= NULL
;
903 int mmie_keyidx
= -1;
909 * There are four types of keys:
911 * - IGTK (group keys for management frames)
912 * - PTK (pairwise keys)
913 * - STK (station-to-station pairwise keys)
915 * When selecting a key, we have to distinguish between multicast
916 * (including broadcast) and unicast frames, the latter can only
917 * use PTKs and STKs while the former always use GTKs and IGTKs.
918 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
919 * unicast frames can also use key indices like GTKs. Hence, if we
920 * don't have a PTK/STK we check the key index for a WEP key.
922 * Note that in a regular BSS, multicast frames are sent by the
923 * AP only, associated stations unicast the frame to the AP first
924 * which then multicasts it on their behalf.
926 * There is also a slight problem in IBSS mode: GTKs are negotiated
927 * with each station, that is something we don't currently handle.
928 * The spec seems to expect that one negotiates the same key with
929 * every station but there's no such requirement; VLANs could be
934 * No point in finding a key and decrypting if the frame is neither
935 * addressed to us nor a multicast frame.
937 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
940 /* start without a key */
944 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
946 fc
= hdr
->frame_control
;
948 if (!ieee80211_has_protected(fc
))
949 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
951 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
953 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
954 (status
->flag
& RX_FLAG_IV_STRIPPED
))
956 /* Skip decryption if the frame is not protected. */
957 if (!ieee80211_has_protected(fc
))
959 } else if (mmie_keyidx
>= 0) {
960 /* Broadcast/multicast robust management frame / BIP */
961 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
962 (status
->flag
& RX_FLAG_IV_STRIPPED
))
965 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
966 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
967 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
969 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
971 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
972 } else if (!ieee80211_has_protected(fc
)) {
974 * The frame was not protected, so skip decryption. However, we
975 * need to set rx->key if there is a key that could have been
976 * used so that the frame may be dropped if encryption would
977 * have been expected.
979 struct ieee80211_key
*key
= NULL
;
980 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
983 if (ieee80211_is_mgmt(fc
) &&
984 is_multicast_ether_addr(hdr
->addr1
) &&
985 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
989 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
990 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
996 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
997 key
= rcu_dereference(sdata
->keys
[i
]);
1009 * The device doesn't give us the IV so we won't be
1010 * able to look up the key. That's ok though, we
1011 * don't need to decrypt the frame, we just won't
1012 * be able to keep statistics accurate.
1013 * Except for key threshold notifications, should
1014 * we somehow allow the driver to tell us which key
1015 * the hardware used if this flag is set?
1017 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1018 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1021 hdrlen
= ieee80211_hdrlen(fc
);
1023 if (rx
->skb
->len
< 8 + hdrlen
)
1024 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1027 * no need to call ieee80211_wep_get_keyidx,
1028 * it verifies a bunch of things we've done already
1030 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1031 keyidx
= keyid
>> 6;
1033 /* check per-station GTK first, if multicast packet */
1034 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1035 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1037 /* if not found, try default key */
1039 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1042 * RSNA-protected unicast frames should always be
1043 * sent with pairwise or station-to-station keys,
1044 * but for WEP we allow using a key index as well.
1047 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1048 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1049 !is_multicast_ether_addr(hdr
->addr1
))
1055 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1056 return RX_DROP_MONITOR
;
1058 rx
->key
->tx_rx_count
++;
1059 /* TODO: add threshold stuff again */
1061 return RX_DROP_MONITOR
;
1064 switch (rx
->key
->conf
.cipher
) {
1065 case WLAN_CIPHER_SUITE_WEP40
:
1066 case WLAN_CIPHER_SUITE_WEP104
:
1067 result
= ieee80211_crypto_wep_decrypt(rx
);
1069 case WLAN_CIPHER_SUITE_TKIP
:
1070 result
= ieee80211_crypto_tkip_decrypt(rx
);
1072 case WLAN_CIPHER_SUITE_CCMP
:
1073 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1075 case WLAN_CIPHER_SUITE_AES_CMAC
:
1076 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1080 * We can reach here only with HW-only algorithms
1081 * but why didn't it decrypt the frame?!
1083 return RX_DROP_UNUSABLE
;
1086 /* the hdr variable is invalid after the decrypt handlers */
1088 /* either the frame has been decrypted or will be dropped */
1089 status
->flag
|= RX_FLAG_DECRYPTED
;
1094 static ieee80211_rx_result debug_noinline
1095 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1097 struct ieee80211_local
*local
;
1098 struct ieee80211_hdr
*hdr
;
1099 struct sk_buff
*skb
;
1103 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1105 if (!local
->pspolling
)
1108 if (!ieee80211_has_fromds(hdr
->frame_control
))
1109 /* this is not from AP */
1112 if (!ieee80211_is_data(hdr
->frame_control
))
1115 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1116 /* AP has no more frames buffered for us */
1117 local
->pspolling
= false;
1121 /* more data bit is set, let's request a new frame from the AP */
1122 ieee80211_send_pspoll(local
, rx
->sdata
);
1127 static void ap_sta_ps_start(struct sta_info
*sta
)
1129 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1130 struct ieee80211_local
*local
= sdata
->local
;
1132 atomic_inc(&sdata
->bss
->num_sta_ps
);
1133 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1134 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1135 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1136 ps_dbg(sdata
, "STA %pM aid %d enters power save mode\n",
1137 sta
->sta
.addr
, sta
->sta
.aid
);
1140 static void ap_sta_ps_end(struct sta_info
*sta
)
1142 ps_dbg(sta
->sdata
, "STA %pM aid %d exits power save mode\n",
1143 sta
->sta
.addr
, sta
->sta
.aid
);
1145 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1146 ps_dbg(sta
->sdata
, "STA %pM aid %d driver-ps-blocked\n",
1147 sta
->sta
.addr
, sta
->sta
.aid
);
1151 ieee80211_sta_ps_deliver_wakeup(sta
);
1154 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1156 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1159 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1161 /* Don't let the same PS state be set twice */
1162 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1163 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1167 ap_sta_ps_start(sta_inf
);
1169 ap_sta_ps_end(sta_inf
);
1173 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1175 static ieee80211_rx_result debug_noinline
1176 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1178 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1179 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1180 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1183 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1186 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1187 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1191 * The device handles station powersave, so don't do anything about
1192 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1193 * it to mac80211 since they're handled.)
1195 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1199 * Don't do anything if the station isn't already asleep. In
1200 * the uAPSD case, the station will probably be marked asleep,
1201 * in the PS-Poll case the station must be confused ...
1203 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1206 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1207 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1208 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1209 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1211 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1214 /* Free PS Poll skb here instead of returning RX_DROP that would
1215 * count as an dropped frame. */
1216 dev_kfree_skb(rx
->skb
);
1219 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1220 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1221 ieee80211_has_pm(hdr
->frame_control
) &&
1222 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1223 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1224 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1225 ac
= ieee802_1d_to_ac
[tid
& 7];
1228 * If this AC is not trigger-enabled do nothing.
1230 * NB: This could/should check a separate bitmap of trigger-
1231 * enabled queues, but for now we only implement uAPSD w/o
1232 * TSPEC changes to the ACs, so they're always the same.
1234 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1237 /* if we are in a service period, do nothing */
1238 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1241 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1242 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1244 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1250 static ieee80211_rx_result debug_noinline
1251 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1253 struct sta_info
*sta
= rx
->sta
;
1254 struct sk_buff
*skb
= rx
->skb
;
1255 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1256 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1262 * Update last_rx only for IBSS packets which are for the current
1263 * BSSID to avoid keeping the current IBSS network alive in cases
1264 * where other STAs start using different BSSID.
1266 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1267 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1268 NL80211_IFTYPE_ADHOC
);
1269 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
)) {
1270 sta
->last_rx
= jiffies
;
1271 if (ieee80211_is_data(hdr
->frame_control
)) {
1272 sta
->last_rx_rate_idx
= status
->rate_idx
;
1273 sta
->last_rx_rate_flag
= status
->flag
;
1276 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1278 * Mesh beacons will update last_rx when if they are found to
1279 * match the current local configuration when processed.
1281 sta
->last_rx
= jiffies
;
1282 if (ieee80211_is_data(hdr
->frame_control
)) {
1283 sta
->last_rx_rate_idx
= status
->rate_idx
;
1284 sta
->last_rx_rate_flag
= status
->flag
;
1288 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1291 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1292 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1294 sta
->rx_fragments
++;
1295 sta
->rx_bytes
+= rx
->skb
->len
;
1296 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1297 sta
->last_signal
= status
->signal
;
1298 ewma_add(&sta
->avg_signal
, -status
->signal
);
1302 * Change STA power saving mode only at the end of a frame
1303 * exchange sequence.
1305 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1306 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1307 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1308 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1309 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1310 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1312 * Ignore doze->wake transitions that are
1313 * indicated by non-data frames, the standard
1314 * is unclear here, but for example going to
1315 * PS mode and then scanning would cause a
1316 * doze->wake transition for the probe request,
1317 * and that is clearly undesirable.
1319 if (ieee80211_is_data(hdr
->frame_control
) &&
1320 !ieee80211_has_pm(hdr
->frame_control
))
1323 if (ieee80211_has_pm(hdr
->frame_control
))
1324 ap_sta_ps_start(sta
);
1329 * Drop (qos-)data::nullfunc frames silently, since they
1330 * are used only to control station power saving mode.
1332 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1333 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1334 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1337 * If we receive a 4-addr nullfunc frame from a STA
1338 * that was not moved to a 4-addr STA vlan yet send
1339 * the event to userspace and for older hostapd drop
1340 * the frame to the monitor interface.
1342 if (ieee80211_has_a4(hdr
->frame_control
) &&
1343 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1344 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1345 !rx
->sdata
->u
.vlan
.sta
))) {
1346 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1347 cfg80211_rx_unexpected_4addr_frame(
1348 rx
->sdata
->dev
, sta
->sta
.addr
,
1350 return RX_DROP_MONITOR
;
1353 * Update counter and free packet here to avoid
1354 * counting this as a dropped packed.
1357 dev_kfree_skb(rx
->skb
);
1362 } /* ieee80211_rx_h_sta_process */
1364 static inline struct ieee80211_fragment_entry
*
1365 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1366 unsigned int frag
, unsigned int seq
, int rx_queue
,
1367 struct sk_buff
**skb
)
1369 struct ieee80211_fragment_entry
*entry
;
1372 idx
= sdata
->fragment_next
;
1373 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1374 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1375 sdata
->fragment_next
= 0;
1377 if (!skb_queue_empty(&entry
->skb_list
))
1378 __skb_queue_purge(&entry
->skb_list
);
1380 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1382 entry
->first_frag_time
= jiffies
;
1384 entry
->rx_queue
= rx_queue
;
1385 entry
->last_frag
= frag
;
1387 entry
->extra_len
= 0;
1392 static inline struct ieee80211_fragment_entry
*
1393 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1394 unsigned int frag
, unsigned int seq
,
1395 int rx_queue
, struct ieee80211_hdr
*hdr
)
1397 struct ieee80211_fragment_entry
*entry
;
1400 idx
= sdata
->fragment_next
;
1401 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1402 struct ieee80211_hdr
*f_hdr
;
1406 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1408 entry
= &sdata
->fragments
[idx
];
1409 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1410 entry
->rx_queue
!= rx_queue
||
1411 entry
->last_frag
+ 1 != frag
)
1414 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1417 * Check ftype and addresses are equal, else check next fragment
1419 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1420 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1421 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1422 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1425 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1426 __skb_queue_purge(&entry
->skb_list
);
1435 static ieee80211_rx_result debug_noinline
1436 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1438 struct ieee80211_hdr
*hdr
;
1441 unsigned int frag
, seq
;
1442 struct ieee80211_fragment_entry
*entry
;
1443 struct sk_buff
*skb
;
1444 struct ieee80211_rx_status
*status
;
1446 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1447 fc
= hdr
->frame_control
;
1448 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1449 frag
= sc
& IEEE80211_SCTL_FRAG
;
1451 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1452 (rx
->skb
)->len
< 24 ||
1453 is_multicast_ether_addr(hdr
->addr1
))) {
1454 /* not fragmented */
1457 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1459 if (skb_linearize(rx
->skb
))
1460 return RX_DROP_UNUSABLE
;
1463 * skb_linearize() might change the skb->data and
1464 * previously cached variables (in this case, hdr) need to
1465 * be refreshed with the new data.
1467 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1468 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1471 /* This is the first fragment of a new frame. */
1472 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1473 rx
->seqno_idx
, &(rx
->skb
));
1474 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1475 ieee80211_has_protected(fc
)) {
1476 int queue
= rx
->security_idx
;
1477 /* Store CCMP PN so that we can verify that the next
1478 * fragment has a sequential PN value. */
1480 memcpy(entry
->last_pn
,
1481 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1487 /* This is a fragment for a frame that should already be pending in
1488 * fragment cache. Add this fragment to the end of the pending entry.
1490 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1491 rx
->seqno_idx
, hdr
);
1493 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1494 return RX_DROP_MONITOR
;
1497 /* Verify that MPDUs within one MSDU have sequential PN values.
1498 * (IEEE 802.11i, 8.3.3.4.5) */
1501 u8 pn
[CCMP_PN_LEN
], *rpn
;
1503 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1504 return RX_DROP_UNUSABLE
;
1505 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1506 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1511 queue
= rx
->security_idx
;
1512 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1513 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1514 return RX_DROP_UNUSABLE
;
1515 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1518 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1519 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1520 entry
->last_frag
= frag
;
1521 entry
->extra_len
+= rx
->skb
->len
;
1522 if (ieee80211_has_morefrags(fc
)) {
1527 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1528 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1529 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1530 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1532 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1533 __skb_queue_purge(&entry
->skb_list
);
1534 return RX_DROP_UNUSABLE
;
1537 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1538 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1542 /* Complete frame has been reassembled - process it now */
1543 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1544 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1548 rx
->sta
->rx_packets
++;
1549 if (is_multicast_ether_addr(hdr
->addr1
))
1550 rx
->local
->dot11MulticastReceivedFrameCount
++;
1552 ieee80211_led_rx(rx
->local
);
1557 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1559 if (unlikely(!rx
->sta
||
1560 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1567 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1569 struct sk_buff
*skb
= rx
->skb
;
1570 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1573 * Pass through unencrypted frames if the hardware has
1574 * decrypted them already.
1576 if (status
->flag
& RX_FLAG_DECRYPTED
)
1579 /* Drop unencrypted frames if key is set. */
1580 if (unlikely(!ieee80211_has_protected(fc
) &&
1581 !ieee80211_is_nullfunc(fc
) &&
1582 ieee80211_is_data(fc
) &&
1583 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1590 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1592 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1593 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1594 __le16 fc
= hdr
->frame_control
;
1597 * Pass through unencrypted frames if the hardware has
1598 * decrypted them already.
1600 if (status
->flag
& RX_FLAG_DECRYPTED
)
1603 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1604 if (unlikely(!ieee80211_has_protected(fc
) &&
1605 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1607 if (ieee80211_is_deauth(fc
))
1608 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1611 else if (ieee80211_is_disassoc(fc
))
1612 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1617 /* BIP does not use Protected field, so need to check MMIE */
1618 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1619 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1620 if (ieee80211_is_deauth(fc
))
1621 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1624 else if (ieee80211_is_disassoc(fc
))
1625 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1631 * When using MFP, Action frames are not allowed prior to
1632 * having configured keys.
1634 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1635 ieee80211_is_robust_mgmt_frame(
1636 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1644 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1646 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1647 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1648 bool check_port_control
= false;
1649 struct ethhdr
*ehdr
;
1652 *port_control
= false;
1653 if (ieee80211_has_a4(hdr
->frame_control
) &&
1654 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1657 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1658 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1660 if (!sdata
->u
.mgd
.use_4addr
)
1663 check_port_control
= true;
1666 if (is_multicast_ether_addr(hdr
->addr1
) &&
1667 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1670 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1674 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1675 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1676 *port_control
= true;
1677 else if (check_port_control
)
1684 * requires that rx->skb is a frame with ethernet header
1686 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1688 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1689 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1690 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1693 * Allow EAPOL frames to us/the PAE group address regardless
1694 * of whether the frame was encrypted or not.
1696 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1697 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1698 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1701 if (ieee80211_802_1x_port_control(rx
) ||
1702 ieee80211_drop_unencrypted(rx
, fc
))
1709 * requires that rx->skb is a frame with ethernet header
1712 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1714 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1715 struct net_device
*dev
= sdata
->dev
;
1716 struct sk_buff
*skb
, *xmit_skb
;
1717 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1718 struct sta_info
*dsta
;
1719 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1724 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1725 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1726 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1727 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1728 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1729 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1731 * send multicast frames both to higher layers in
1732 * local net stack and back to the wireless medium
1734 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1736 net_info_ratelimited("%s: failed to clone multicast frame\n",
1739 dsta
= sta_info_get(sdata
, skb
->data
);
1742 * The destination station is associated to
1743 * this AP (in this VLAN), so send the frame
1744 * directly to it and do not pass it to local
1754 int align __maybe_unused
;
1756 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1758 * 'align' will only take the values 0 or 2 here
1759 * since all frames are required to be aligned
1760 * to 2-byte boundaries when being passed to
1761 * mac80211. That also explains the __skb_push()
1764 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1766 if (WARN_ON(skb_headroom(skb
) < 3)) {
1770 u8
*data
= skb
->data
;
1771 size_t len
= skb_headlen(skb
);
1773 memmove(skb
->data
, data
, len
);
1774 skb_set_tail_pointer(skb
, len
);
1780 /* deliver to local stack */
1781 skb
->protocol
= eth_type_trans(skb
, dev
);
1782 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1783 netif_receive_skb(skb
);
1789 * Send to wireless media and increase priority by 256 to
1790 * keep the received priority instead of reclassifying
1791 * the frame (see cfg80211_classify8021d).
1793 xmit_skb
->priority
+= 256;
1794 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1795 skb_reset_network_header(xmit_skb
);
1796 skb_reset_mac_header(xmit_skb
);
1797 dev_queue_xmit(xmit_skb
);
1801 static ieee80211_rx_result debug_noinline
1802 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1804 struct net_device
*dev
= rx
->sdata
->dev
;
1805 struct sk_buff
*skb
= rx
->skb
;
1806 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1807 __le16 fc
= hdr
->frame_control
;
1808 struct sk_buff_head frame_list
;
1809 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1811 if (unlikely(!ieee80211_is_data(fc
)))
1814 if (unlikely(!ieee80211_is_data_present(fc
)))
1815 return RX_DROP_MONITOR
;
1817 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1820 if (ieee80211_has_a4(hdr
->frame_control
) &&
1821 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1822 !rx
->sdata
->u
.vlan
.sta
)
1823 return RX_DROP_UNUSABLE
;
1825 if (is_multicast_ether_addr(hdr
->addr1
) &&
1826 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1827 rx
->sdata
->u
.vlan
.sta
) ||
1828 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1829 rx
->sdata
->u
.mgd
.use_4addr
)))
1830 return RX_DROP_UNUSABLE
;
1833 __skb_queue_head_init(&frame_list
);
1835 if (skb_linearize(skb
))
1836 return RX_DROP_UNUSABLE
;
1838 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1839 rx
->sdata
->vif
.type
,
1840 rx
->local
->hw
.extra_tx_headroom
, true);
1842 while (!skb_queue_empty(&frame_list
)) {
1843 rx
->skb
= __skb_dequeue(&frame_list
);
1845 if (!ieee80211_frame_allowed(rx
, fc
)) {
1846 dev_kfree_skb(rx
->skb
);
1849 dev
->stats
.rx_packets
++;
1850 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1852 ieee80211_deliver_skb(rx
);
1858 #ifdef CONFIG_MAC80211_MESH
1859 static ieee80211_rx_result
1860 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1862 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
1863 struct ieee80211_tx_info
*info
;
1864 struct ieee80211s_hdr
*mesh_hdr
;
1865 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1866 struct ieee80211_local
*local
= rx
->local
;
1867 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1868 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1869 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1870 __le16 reason
= cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD
);
1873 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1874 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1875 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1877 /* frame is in RMC, don't forward */
1878 if (ieee80211_is_data(hdr
->frame_control
) &&
1879 is_multicast_ether_addr(hdr
->addr1
) &&
1880 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1881 return RX_DROP_MONITOR
;
1883 if (!ieee80211_is_data(hdr
->frame_control
))
1887 return RX_DROP_MONITOR
;
1889 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1890 struct mesh_path
*mppath
;
1894 if (is_multicast_ether_addr(hdr
->addr1
)) {
1895 mpp_addr
= hdr
->addr3
;
1896 proxied_addr
= mesh_hdr
->eaddr1
;
1898 mpp_addr
= hdr
->addr4
;
1899 proxied_addr
= mesh_hdr
->eaddr2
;
1903 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1905 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1907 spin_lock_bh(&mppath
->state_lock
);
1908 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
1909 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1910 spin_unlock_bh(&mppath
->state_lock
);
1915 /* Frame has reached destination. Don't forward */
1916 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1917 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
1920 q
= ieee80211_select_queue_80211(sdata
, skb
, hdr
);
1921 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
1922 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
1923 return RX_DROP_MONITOR
;
1925 skb_set_queue_mapping(skb
, q
);
1927 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1930 if (!--mesh_hdr
->ttl
) {
1931 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
1932 return RX_DROP_MONITOR
;
1935 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
1938 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1940 net_info_ratelimited("%s: failed to clone mesh frame\n",
1945 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1946 info
= IEEE80211_SKB_CB(fwd_skb
);
1947 memset(info
, 0, sizeof(*info
));
1948 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1949 info
->control
.vif
= &rx
->sdata
->vif
;
1950 info
->control
.jiffies
= jiffies
;
1951 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1952 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
1953 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1954 } else if (!mesh_nexthop_lookup(fwd_skb
, sdata
)) {
1955 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
1957 /* unable to resolve next hop */
1958 mesh_path_error_tx(ifmsh
->mshcfg
.element_ttl
, fwd_hdr
->addr3
,
1959 0, reason
, fwd_hdr
->addr2
, sdata
);
1960 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
1962 return RX_DROP_MONITOR
;
1965 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
1966 ieee80211_add_pending_skb(local
, fwd_skb
);
1968 if (is_multicast_ether_addr(hdr
->addr1
) ||
1969 sdata
->dev
->flags
& IFF_PROMISC
)
1972 return RX_DROP_MONITOR
;
1976 static ieee80211_rx_result debug_noinline
1977 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1979 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1980 struct ieee80211_local
*local
= rx
->local
;
1981 struct net_device
*dev
= sdata
->dev
;
1982 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1983 __le16 fc
= hdr
->frame_control
;
1987 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1990 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1991 return RX_DROP_MONITOR
;
1994 * Send unexpected-4addr-frame event to hostapd. For older versions,
1995 * also drop the frame to cooked monitor interfaces.
1997 if (ieee80211_has_a4(hdr
->frame_control
) &&
1998 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2000 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2001 cfg80211_rx_unexpected_4addr_frame(
2002 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2003 return RX_DROP_MONITOR
;
2006 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2008 return RX_DROP_UNUSABLE
;
2010 if (!ieee80211_frame_allowed(rx
, fc
))
2011 return RX_DROP_MONITOR
;
2013 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2014 unlikely(port_control
) && sdata
->bss
) {
2015 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2023 dev
->stats
.rx_packets
++;
2024 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2026 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2027 !is_multicast_ether_addr(
2028 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2029 (!local
->scanning
&&
2030 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2031 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2032 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2035 ieee80211_deliver_skb(rx
);
2040 static ieee80211_rx_result debug_noinline
2041 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2043 struct sk_buff
*skb
= rx
->skb
;
2044 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2045 struct tid_ampdu_rx
*tid_agg_rx
;
2049 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2052 if (ieee80211_is_back_req(bar
->frame_control
)) {
2054 __le16 control
, start_seq_num
;
2055 } __packed bar_data
;
2058 return RX_DROP_MONITOR
;
2060 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2061 &bar_data
, sizeof(bar_data
)))
2062 return RX_DROP_MONITOR
;
2064 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2066 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2068 return RX_DROP_MONITOR
;
2070 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2072 /* reset session timer */
2073 if (tid_agg_rx
->timeout
)
2074 mod_timer(&tid_agg_rx
->session_timer
,
2075 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2077 spin_lock(&tid_agg_rx
->reorder_lock
);
2078 /* release stored frames up to start of BAR */
2079 ieee80211_release_reorder_frames(rx
->sdata
, tid_agg_rx
,
2081 spin_unlock(&tid_agg_rx
->reorder_lock
);
2088 * After this point, we only want management frames,
2089 * so we can drop all remaining control frames to
2090 * cooked monitor interfaces.
2092 return RX_DROP_MONITOR
;
2095 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2096 struct ieee80211_mgmt
*mgmt
,
2099 struct ieee80211_local
*local
= sdata
->local
;
2100 struct sk_buff
*skb
;
2101 struct ieee80211_mgmt
*resp
;
2103 if (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2104 /* Not to own unicast address */
2108 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2109 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
2110 /* Not from the current AP or not associated yet. */
2114 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2115 /* Too short SA Query request frame */
2119 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2123 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2124 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2125 memset(resp
, 0, 24);
2126 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2127 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2128 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2129 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2130 IEEE80211_STYPE_ACTION
);
2131 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2132 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2133 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2134 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2135 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2136 WLAN_SA_QUERY_TR_ID_LEN
);
2138 ieee80211_tx_skb(sdata
, skb
);
2141 static ieee80211_rx_result debug_noinline
2142 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2144 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2145 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2148 * From here on, look only at management frames.
2149 * Data and control frames are already handled,
2150 * and unknown (reserved) frames are useless.
2152 if (rx
->skb
->len
< 24)
2153 return RX_DROP_MONITOR
;
2155 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2156 return RX_DROP_MONITOR
;
2158 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2159 ieee80211_is_beacon(mgmt
->frame_control
) &&
2160 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2163 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2164 sig
= status
->signal
;
2166 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2167 rx
->skb
->data
, rx
->skb
->len
,
2168 status
->freq
, sig
, GFP_ATOMIC
);
2169 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2172 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2173 return RX_DROP_MONITOR
;
2175 if (ieee80211_drop_unencrypted_mgmt(rx
))
2176 return RX_DROP_UNUSABLE
;
2181 static ieee80211_rx_result debug_noinline
2182 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2184 struct ieee80211_local
*local
= rx
->local
;
2185 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2186 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2187 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2188 int len
= rx
->skb
->len
;
2190 if (!ieee80211_is_action(mgmt
->frame_control
))
2193 /* drop too small frames */
2194 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2195 return RX_DROP_UNUSABLE
;
2197 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2198 return RX_DROP_UNUSABLE
;
2200 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2201 return RX_DROP_UNUSABLE
;
2203 switch (mgmt
->u
.action
.category
) {
2204 case WLAN_CATEGORY_HT
:
2205 /* reject HT action frames from stations not supporting HT */
2206 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2209 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2210 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2211 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2212 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2213 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2216 /* verify action & smps_control are present */
2217 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2220 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2221 case WLAN_HT_ACTION_SMPS
: {
2222 struct ieee80211_supported_band
*sband
;
2225 /* convert to HT capability */
2226 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2227 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2228 smps
= WLAN_HT_CAP_SM_PS_DISABLED
;
2230 case WLAN_HT_SMPS_CONTROL_STATIC
:
2231 smps
= WLAN_HT_CAP_SM_PS_STATIC
;
2233 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2234 smps
= WLAN_HT_CAP_SM_PS_DYNAMIC
;
2239 smps
<<= IEEE80211_HT_CAP_SM_PS_SHIFT
;
2241 /* if no change do nothing */
2242 if ((rx
->sta
->sta
.ht_cap
.cap
&
2243 IEEE80211_HT_CAP_SM_PS
) == smps
)
2246 rx
->sta
->sta
.ht_cap
.cap
&= ~IEEE80211_HT_CAP_SM_PS
;
2247 rx
->sta
->sta
.ht_cap
.cap
|= smps
;
2249 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2251 rate_control_rate_update(local
, sband
, rx
->sta
,
2252 IEEE80211_RC_SMPS_CHANGED
);
2260 case WLAN_CATEGORY_BACK
:
2261 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2262 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2263 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2264 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2265 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2268 /* verify action_code is present */
2269 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2272 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2273 case WLAN_ACTION_ADDBA_REQ
:
2274 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2275 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2278 case WLAN_ACTION_ADDBA_RESP
:
2279 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2280 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2283 case WLAN_ACTION_DELBA
:
2284 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2285 sizeof(mgmt
->u
.action
.u
.delba
)))
2293 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2294 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2297 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2300 /* verify action_code is present */
2301 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2304 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2305 case WLAN_ACTION_SPCT_MSR_REQ
:
2306 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2307 sizeof(mgmt
->u
.action
.u
.measurement
)))
2309 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2311 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2312 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2313 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2316 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2319 if (!ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2325 case WLAN_CATEGORY_SA_QUERY
:
2326 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2327 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2330 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2331 case WLAN_ACTION_SA_QUERY_REQUEST
:
2332 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2334 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2338 case WLAN_CATEGORY_SELF_PROTECTED
:
2339 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2340 case WLAN_SP_MESH_PEERING_OPEN
:
2341 case WLAN_SP_MESH_PEERING_CLOSE
:
2342 case WLAN_SP_MESH_PEERING_CONFIRM
:
2343 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2345 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2346 /* userspace handles this frame */
2349 case WLAN_SP_MGK_INFORM
:
2350 case WLAN_SP_MGK_ACK
:
2351 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2356 case WLAN_CATEGORY_MESH_ACTION
:
2357 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2359 if (mesh_action_is_path_sel(mgmt
) &&
2360 (!mesh_path_sel_is_hwmp(sdata
)))
2368 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2369 /* will return in the next handlers */
2374 rx
->sta
->rx_packets
++;
2375 dev_kfree_skb(rx
->skb
);
2379 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2380 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2381 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2383 rx
->sta
->rx_packets
++;
2387 static ieee80211_rx_result debug_noinline
2388 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2390 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2393 /* skip known-bad action frames and return them in the next handler */
2394 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2398 * Getting here means the kernel doesn't know how to handle
2399 * it, but maybe userspace does ... include returned frames
2400 * so userspace can register for those to know whether ones
2401 * it transmitted were processed or returned.
2404 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2405 sig
= status
->signal
;
2407 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
, sig
,
2408 rx
->skb
->data
, rx
->skb
->len
,
2411 rx
->sta
->rx_packets
++;
2412 dev_kfree_skb(rx
->skb
);
2420 static ieee80211_rx_result debug_noinline
2421 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2423 struct ieee80211_local
*local
= rx
->local
;
2424 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2425 struct sk_buff
*nskb
;
2426 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2427 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2429 if (!ieee80211_is_action(mgmt
->frame_control
))
2433 * For AP mode, hostapd is responsible for handling any action
2434 * frames that we didn't handle, including returning unknown
2435 * ones. For all other modes we will return them to the sender,
2436 * setting the 0x80 bit in the action category, as required by
2437 * 802.11-2012 9.24.4.
2438 * Newer versions of hostapd shall also use the management frame
2439 * registration mechanisms, but older ones still use cooked
2440 * monitor interfaces so push all frames there.
2442 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2443 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2444 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2445 return RX_DROP_MONITOR
;
2447 if (is_multicast_ether_addr(mgmt
->da
))
2448 return RX_DROP_MONITOR
;
2450 /* do not return rejected action frames */
2451 if (mgmt
->u
.action
.category
& 0x80)
2452 return RX_DROP_UNUSABLE
;
2454 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2457 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2459 nmgmt
->u
.action
.category
|= 0x80;
2460 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2461 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2463 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2465 ieee80211_tx_skb(rx
->sdata
, nskb
);
2467 dev_kfree_skb(rx
->skb
);
2471 static ieee80211_rx_result debug_noinline
2472 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2474 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2475 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2478 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2480 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2481 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2482 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2483 return RX_DROP_MONITOR
;
2486 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2487 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2488 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2489 /* process for all: mesh, mlme, ibss */
2491 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2492 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2493 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2494 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2495 if (is_multicast_ether_addr(mgmt
->da
) &&
2496 !is_broadcast_ether_addr(mgmt
->da
))
2497 return RX_DROP_MONITOR
;
2499 /* process only for station */
2500 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2501 return RX_DROP_MONITOR
;
2503 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2504 /* process only for ibss */
2505 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2506 return RX_DROP_MONITOR
;
2509 return RX_DROP_MONITOR
;
2512 /* queue up frame and kick off work to process it */
2513 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2514 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2515 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2517 rx
->sta
->rx_packets
++;
2522 /* TODO: use IEEE80211_RX_FRAGMENTED */
2523 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2524 struct ieee80211_rate
*rate
)
2526 struct ieee80211_sub_if_data
*sdata
;
2527 struct ieee80211_local
*local
= rx
->local
;
2528 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2529 struct net_device
*prev_dev
= NULL
;
2530 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2531 int needed_headroom
;
2534 * If cooked monitor has been processed already, then
2535 * don't do it again. If not, set the flag.
2537 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2539 rx
->flags
|= IEEE80211_RX_CMNTR
;
2541 /* If there are no cooked monitor interfaces, just free the SKB */
2542 if (!local
->cooked_mntrs
)
2545 /* room for the radiotap header based on driver features */
2546 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
2548 if (skb_headroom(skb
) < needed_headroom
&&
2549 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2552 /* prepend radiotap information */
2553 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2556 skb_set_mac_header(skb
, 0);
2557 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2558 skb
->pkt_type
= PACKET_OTHERHOST
;
2559 skb
->protocol
= htons(ETH_P_802_2
);
2561 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2562 if (!ieee80211_sdata_running(sdata
))
2565 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2566 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2570 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2572 skb2
->dev
= prev_dev
;
2573 netif_receive_skb(skb2
);
2577 prev_dev
= sdata
->dev
;
2578 sdata
->dev
->stats
.rx_packets
++;
2579 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2583 skb
->dev
= prev_dev
;
2584 netif_receive_skb(skb
);
2592 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2593 ieee80211_rx_result res
)
2596 case RX_DROP_MONITOR
:
2597 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2599 rx
->sta
->rx_dropped
++;
2602 struct ieee80211_rate
*rate
= NULL
;
2603 struct ieee80211_supported_band
*sband
;
2604 struct ieee80211_rx_status
*status
;
2606 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2608 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2609 if (!(status
->flag
& RX_FLAG_HT
))
2610 rate
= &sband
->bitrates
[status
->rate_idx
];
2612 ieee80211_rx_cooked_monitor(rx
, rate
);
2615 case RX_DROP_UNUSABLE
:
2616 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2618 rx
->sta
->rx_dropped
++;
2619 dev_kfree_skb(rx
->skb
);
2622 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2627 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2629 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2630 struct sk_buff
*skb
;
2632 #define CALL_RXH(rxh) \
2635 if (res != RX_CONTINUE) \
2639 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2640 if (rx
->local
->running_rx_handler
)
2643 rx
->local
->running_rx_handler
= true;
2645 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2646 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2649 * all the other fields are valid across frames
2650 * that belong to an aMPDU since they are on the
2651 * same TID from the same station
2655 CALL_RXH(ieee80211_rx_h_decrypt
)
2656 CALL_RXH(ieee80211_rx_h_check_more_data
)
2657 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2658 CALL_RXH(ieee80211_rx_h_sta_process
)
2659 CALL_RXH(ieee80211_rx_h_defragment
)
2660 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2661 /* must be after MMIC verify so header is counted in MPDU mic */
2662 #ifdef CONFIG_MAC80211_MESH
2663 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2664 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2666 CALL_RXH(ieee80211_rx_h_amsdu
)
2667 CALL_RXH(ieee80211_rx_h_data
)
2668 CALL_RXH(ieee80211_rx_h_ctrl
);
2669 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2670 CALL_RXH(ieee80211_rx_h_action
)
2671 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2672 CALL_RXH(ieee80211_rx_h_action_return
)
2673 CALL_RXH(ieee80211_rx_h_mgmt
)
2676 ieee80211_rx_handlers_result(rx
, res
);
2677 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2681 rx
->local
->running_rx_handler
= false;
2684 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2687 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2689 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2691 #define CALL_RXH(rxh) \
2694 if (res != RX_CONTINUE) \
2698 CALL_RXH(ieee80211_rx_h_passive_scan
)
2699 CALL_RXH(ieee80211_rx_h_check
)
2701 ieee80211_rx_reorder_ampdu(rx
);
2703 ieee80211_rx_handlers(rx
);
2707 ieee80211_rx_handlers_result(rx
, res
);
2713 * This function makes calls into the RX path, therefore
2714 * it has to be invoked under RCU read lock.
2716 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2718 struct ieee80211_rx_data rx
= {
2720 .sdata
= sta
->sdata
,
2721 .local
= sta
->local
,
2722 /* This is OK -- must be QoS data frame */
2723 .security_idx
= tid
,
2727 struct tid_ampdu_rx
*tid_agg_rx
;
2729 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2733 spin_lock(&tid_agg_rx
->reorder_lock
);
2734 ieee80211_sta_reorder_release(sta
->sdata
, tid_agg_rx
);
2735 spin_unlock(&tid_agg_rx
->reorder_lock
);
2737 ieee80211_rx_handlers(&rx
);
2740 /* main receive path */
2742 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2743 struct ieee80211_hdr
*hdr
)
2745 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2746 struct sk_buff
*skb
= rx
->skb
;
2747 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2748 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2749 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2751 switch (sdata
->vif
.type
) {
2752 case NL80211_IFTYPE_STATION
:
2753 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2756 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2757 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2758 sdata
->u
.mgd
.use_4addr
)
2760 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2763 case NL80211_IFTYPE_ADHOC
:
2766 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2769 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2770 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2772 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2773 } else if (!multicast
&&
2774 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2775 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2777 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2778 } else if (!rx
->sta
) {
2780 if (status
->flag
& RX_FLAG_HT
)
2781 rate_idx
= 0; /* TODO: HT rates */
2783 rate_idx
= status
->rate_idx
;
2784 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
2788 case NL80211_IFTYPE_MESH_POINT
:
2790 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2791 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2794 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2797 case NL80211_IFTYPE_AP_VLAN
:
2798 case NL80211_IFTYPE_AP
:
2800 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
2802 } else if (!ieee80211_bssid_match(bssid
,
2805 * Accept public action frames even when the
2806 * BSSID doesn't match, this is used for P2P
2807 * and location updates. Note that mac80211
2808 * itself never looks at these frames.
2810 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2811 ieee80211_is_public_action(hdr
, skb
->len
))
2813 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2814 !ieee80211_is_beacon(hdr
->frame_control
))
2816 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2819 case NL80211_IFTYPE_WDS
:
2820 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2822 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2826 /* should never get here */
2835 * This function returns whether or not the SKB
2836 * was destined for RX processing or not, which,
2837 * if consume is true, is equivalent to whether
2838 * or not the skb was consumed.
2840 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2841 struct sk_buff
*skb
, bool consume
)
2843 struct ieee80211_local
*local
= rx
->local
;
2844 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2845 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2846 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2850 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2851 prepares
= prepare_for_handlers(rx
, hdr
);
2857 skb
= skb_copy(skb
, GFP_ATOMIC
);
2859 if (net_ratelimit())
2860 wiphy_debug(local
->hw
.wiphy
,
2861 "failed to copy skb for %s\n",
2869 ieee80211_invoke_rx_handlers(rx
);
2874 * This is the actual Rx frames handler. as it blongs to Rx path it must
2875 * be called with rcu_read_lock protection.
2877 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2878 struct sk_buff
*skb
)
2880 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2881 struct ieee80211_local
*local
= hw_to_local(hw
);
2882 struct ieee80211_sub_if_data
*sdata
;
2883 struct ieee80211_hdr
*hdr
;
2885 struct ieee80211_rx_data rx
;
2886 struct ieee80211_sub_if_data
*prev
;
2887 struct sta_info
*sta
, *tmp
, *prev_sta
;
2890 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2891 memset(&rx
, 0, sizeof(rx
));
2895 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2896 local
->dot11ReceivedFragmentCount
++;
2898 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2899 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
2900 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2901 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2903 if (ieee80211_is_mgmt(fc
))
2904 err
= skb_linearize(skb
);
2906 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2913 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2914 ieee80211_parse_qos(&rx
);
2915 ieee80211_verify_alignment(&rx
);
2917 if (ieee80211_is_data(fc
)) {
2920 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2927 rx
.sdata
= prev_sta
->sdata
;
2928 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2935 rx
.sdata
= prev_sta
->sdata
;
2937 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2945 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2946 if (!ieee80211_sdata_running(sdata
))
2949 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2950 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2954 * frame is destined for this interface, but if it's
2955 * not also for the previous one we handle that after
2956 * the loop to avoid copying the SKB once too much
2964 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2966 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2972 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2975 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2984 * This is the receive path handler. It is called by a low level driver when an
2985 * 802.11 MPDU is received from the hardware.
2987 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2989 struct ieee80211_local
*local
= hw_to_local(hw
);
2990 struct ieee80211_rate
*rate
= NULL
;
2991 struct ieee80211_supported_band
*sband
;
2992 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2994 WARN_ON_ONCE(softirq_count() == 0);
2996 if (WARN_ON(status
->band
< 0 ||
2997 status
->band
>= IEEE80211_NUM_BANDS
))
3000 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3001 if (WARN_ON(!sband
))
3005 * If we're suspending, it is possible although not too likely
3006 * that we'd be receiving frames after having already partially
3007 * quiesced the stack. We can't process such frames then since
3008 * that might, for example, cause stations to be added or other
3009 * driver callbacks be invoked.
3011 if (unlikely(local
->quiescing
|| local
->suspended
))
3014 /* We might be during a HW reconfig, prevent Rx for the same reason */
3015 if (unlikely(local
->in_reconfig
))
3019 * The same happens when we're not even started,
3020 * but that's worth a warning.
3022 if (WARN_ON(!local
->started
))
3025 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3027 * Validate the rate, unless a PLCP error means that
3028 * we probably can't have a valid rate here anyway.
3031 if (status
->flag
& RX_FLAG_HT
) {
3033 * rate_idx is MCS index, which can be [0-76]
3036 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3038 * Anything else would be some sort of driver or
3039 * hardware error. The driver should catch hardware
3042 if (WARN((status
->rate_idx
< 0 ||
3043 status
->rate_idx
> 76),
3044 "Rate marked as an HT rate but passed "
3045 "status->rate_idx is not "
3046 "an MCS index [0-76]: %d (0x%02x)\n",
3051 if (WARN_ON(status
->rate_idx
< 0 ||
3052 status
->rate_idx
>= sband
->n_bitrates
))
3054 rate
= &sband
->bitrates
[status
->rate_idx
];
3058 status
->rx_flags
= 0;
3061 * key references and virtual interfaces are protected using RCU
3062 * and this requires that we are in a read-side RCU section during
3063 * receive processing
3068 * Frames with failed FCS/PLCP checksum are not returned,
3069 * all other frames are returned without radiotap header
3070 * if it was previously present.
3071 * Also, frames with less than 16 bytes are dropped.
3073 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3079 ieee80211_tpt_led_trig_rx(local
,
3080 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3082 __ieee80211_rx_handle_packet(hw
, skb
);
3090 EXPORT_SYMBOL(ieee80211_rx
);
3092 /* This is a version of the rx handler that can be called from hard irq
3093 * context. Post the skb on the queue and schedule the tasklet */
3094 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3096 struct ieee80211_local
*local
= hw_to_local(hw
);
3098 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3100 skb
->pkt_type
= IEEE80211_RX_MSG
;
3101 skb_queue_tail(&local
->skb_queue
, skb
);
3102 tasklet_schedule(&local
->tasklet
);
3104 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);