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 <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
40 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
41 if (likely(skb
->len
> FCS_LEN
))
42 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
54 static inline int should_drop_frame(struct sk_buff
*skb
,
57 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
58 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
60 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
62 if (unlikely(skb
->len
< 16 + present_fcs_len
))
64 if (ieee80211_is_ctl(hdr
->frame_control
) &&
65 !ieee80211_is_pspoll(hdr
->frame_control
) &&
66 !ieee80211_is_back_req(hdr
->frame_control
))
72 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
73 struct ieee80211_rx_status
*status
)
77 /* always present fields */
78 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
80 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
82 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
85 if (len
& 1) /* padding for RX_FLAGS if necessary */
88 if (status
->flag
& RX_FLAG_HT
) /* HT info */
95 * ieee80211_add_rx_radiotap_header - add radiotap header
97 * add a radiotap header containing all the fields which the hardware provided.
100 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
102 struct ieee80211_rate
*rate
,
105 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
106 struct ieee80211_radiotap_header
*rthdr
;
110 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
111 memset(rthdr
, 0, rtap_len
);
113 /* radiotap header, set always present flags */
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
116 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
119 rthdr
->it_len
= cpu_to_le16(rtap_len
);
121 pos
= (unsigned char *)(rthdr
+1);
123 /* the order of the following fields is important */
125 /* IEEE80211_RADIOTAP_TSFT */
126 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
127 put_unaligned_le64(status
->mactime
, pos
);
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
135 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
136 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
137 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
138 if (status
->flag
& RX_FLAG_SHORTPRE
)
139 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
142 /* IEEE80211_RADIOTAP_RATE */
143 if (status
->flag
& RX_FLAG_HT
) {
145 * MCS information is a separate field in radiotap,
146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
151 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
152 *pos
= rate
->bitrate
/ 5;
156 /* IEEE80211_RADIOTAP_CHANNEL */
157 put_unaligned_le16(status
->freq
, pos
);
159 if (status
->band
== IEEE80211_BAND_5GHZ
)
160 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
162 else if (status
->flag
& RX_FLAG_HT
)
163 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
165 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
166 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
169 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
175 *pos
= status
->signal
;
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos
= status
->antenna
;
187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
191 if ((pos
- (u8
*)rthdr
) & 1)
193 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
194 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
195 put_unaligned_le16(rx_flags
, pos
);
198 if (status
->flag
& RX_FLAG_HT
) {
199 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
200 *pos
++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS
|
201 IEEE80211_RADIOTAP_MCS_HAVE_GI
|
202 IEEE80211_RADIOTAP_MCS_HAVE_BW
;
204 if (status
->flag
& RX_FLAG_SHORT_GI
)
205 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
206 if (status
->flag
& RX_FLAG_40MHZ
)
207 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
209 *pos
++ = status
->rate_idx
;
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
218 static struct sk_buff
*
219 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
220 struct ieee80211_rate
*rate
)
222 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
223 struct ieee80211_sub_if_data
*sdata
;
224 int needed_headroom
= 0;
225 struct sk_buff
*skb
, *skb2
;
226 struct net_device
*prev_dev
= NULL
;
227 int present_fcs_len
= 0;
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
238 /* room for the radiotap header based on driver features */
239 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
241 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
242 present_fcs_len
= FCS_LEN
;
244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb
, 2)) {
246 dev_kfree_skb(origskb
);
250 if (!local
->monitors
) {
251 if (should_drop_frame(origskb
, present_fcs_len
)) {
252 dev_kfree_skb(origskb
);
256 return remove_monitor_info(local
, origskb
);
259 if (should_drop_frame(origskb
, present_fcs_len
)) {
260 /* only need to expand headroom if necessary */
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
271 if (skb_headroom(skb
) < needed_headroom
&&
272 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
281 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
283 origskb
= remove_monitor_info(local
, origskb
);
289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
292 skb_reset_mac_header(skb
);
293 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
294 skb
->pkt_type
= PACKET_OTHERHOST
;
295 skb
->protocol
= htons(ETH_P_802_2
);
297 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
298 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
301 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
304 if (!ieee80211_sdata_running(sdata
))
308 skb2
= skb_clone(skb
, GFP_ATOMIC
);
310 skb2
->dev
= prev_dev
;
311 netif_receive_skb(skb2
);
315 prev_dev
= sdata
->dev
;
316 sdata
->dev
->stats
.rx_packets
++;
317 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
322 netif_receive_skb(skb
);
330 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
332 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
333 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
334 int tid
, seqno_idx
, security_idx
;
336 /* does the frame have a qos control field? */
337 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
338 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
339 /* frame has qos control */
340 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
341 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
342 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
350 * Sequence numbers for management frames, QoS data
351 * frames with a broadcast/multicast address in the
352 * Address 1 field, and all non-QoS data frames sent
353 * by QoS STAs are assigned using an additional single
354 * modulo-4096 counter, [...]
356 * We also use that counter for non-QoS STAs.
358 seqno_idx
= NUM_RX_DATA_QUEUES
;
360 if (ieee80211_is_mgmt(hdr
->frame_control
))
361 security_idx
= NUM_RX_DATA_QUEUES
;
365 rx
->seqno_idx
= seqno_idx
;
366 rx
->security_idx
= security_idx
;
367 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368 * For now, set skb->priority to 0 for other cases. */
369 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
373 * DOC: Packet alignment
375 * Drivers always need to pass packets that are aligned to two-byte boundaries
378 * Additionally, should, if possible, align the payload data in a way that
379 * guarantees that the contained IP header is aligned to a four-byte
380 * boundary. In the case of regular frames, this simply means aligning the
381 * payload to a four-byte boundary (because either the IP header is directly
382 * contained, or IV/RFC1042 headers that have a length divisible by four are
383 * in front of it). If the payload data is not properly aligned and the
384 * architecture doesn't support efficient unaligned operations, mac80211
385 * will align the data.
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
393 * Padding like Atheros hardware adds which is between the 802.11 header and
394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
397 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
399 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
401 "unaligned packet at 0x%p\n", rx
->skb
->data
);
408 static ieee80211_rx_result debug_noinline
409 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
411 struct ieee80211_local
*local
= rx
->local
;
412 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
413 struct sk_buff
*skb
= rx
->skb
;
415 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
416 !local
->sched_scanning
))
419 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
420 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
421 local
->sched_scanning
)
422 return ieee80211_scan_rx(rx
->sdata
, skb
);
424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
426 return RX_DROP_UNUSABLE
;
430 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
432 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
434 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
437 return ieee80211_is_robust_mgmt_frame(hdr
);
441 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
443 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
445 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
448 return ieee80211_is_robust_mgmt_frame(hdr
);
452 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
455 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
456 struct ieee80211_mmie
*mmie
;
458 if (skb
->len
< 24 + sizeof(*mmie
) ||
459 !is_multicast_ether_addr(hdr
->da
))
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
463 return -1; /* not a robust management frame */
465 mmie
= (struct ieee80211_mmie
*)
466 (skb
->data
+ skb
->len
- sizeof(*mmie
));
467 if (mmie
->element_id
!= WLAN_EID_MMIE
||
468 mmie
->length
!= sizeof(*mmie
) - 2)
471 return le16_to_cpu(mmie
->key_id
);
475 static ieee80211_rx_result
476 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
478 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
479 char *dev_addr
= rx
->sdata
->vif
.addr
;
481 if (ieee80211_is_data(hdr
->frame_control
)) {
482 if (is_multicast_ether_addr(hdr
->addr1
)) {
483 if (ieee80211_has_tods(hdr
->frame_control
) ||
484 !ieee80211_has_fromds(hdr
->frame_control
))
485 return RX_DROP_MONITOR
;
486 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
487 return RX_DROP_MONITOR
;
489 if (!ieee80211_has_a4(hdr
->frame_control
))
490 return RX_DROP_MONITOR
;
491 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
492 return RX_DROP_MONITOR
;
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
500 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
501 struct ieee80211_mgmt
*mgmt
;
503 if (!ieee80211_is_mgmt(hdr
->frame_control
))
504 return RX_DROP_MONITOR
;
506 if (ieee80211_is_action(hdr
->frame_control
)) {
508 mgmt
= (struct ieee80211_mgmt
*)hdr
;
509 category
= mgmt
->u
.action
.category
;
510 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
511 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
512 return RX_DROP_MONITOR
;
516 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
517 ieee80211_is_probe_resp(hdr
->frame_control
) ||
518 ieee80211_is_beacon(hdr
->frame_control
) ||
519 ieee80211_is_auth(hdr
->frame_control
))
522 return RX_DROP_MONITOR
;
529 #define SEQ_MODULO 0x1000
530 #define SEQ_MASK 0xfff
532 static inline int seq_less(u16 sq1
, u16 sq2
)
534 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
537 static inline u16
seq_inc(u16 sq
)
539 return (sq
+ 1) & SEQ_MASK
;
542 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
544 return (sq1
- sq2
) & SEQ_MASK
;
548 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
549 struct tid_ampdu_rx
*tid_agg_rx
,
552 struct ieee80211_local
*local
= hw_to_local(hw
);
553 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
554 struct ieee80211_rx_status
*status
;
556 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
561 /* release the frame from the reorder ring buffer */
562 tid_agg_rx
->stored_mpdu_num
--;
563 tid_agg_rx
->reorder_buf
[index
] = NULL
;
564 status
= IEEE80211_SKB_RXCB(skb
);
565 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
566 skb_queue_tail(&local
->rx_skb_queue
, skb
);
569 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
572 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
573 struct tid_ampdu_rx
*tid_agg_rx
,
578 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
580 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
581 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
582 tid_agg_rx
->buf_size
;
583 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
588 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
589 * the skb was added to the buffer longer than this time ago, the earlier
590 * frames that have not yet been received are assumed to be lost and the skb
591 * can be released for processing. This may also release other skb's from the
592 * reorder buffer if there are no additional gaps between the frames.
594 * Callers must hold tid_agg_rx->reorder_lock.
596 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
598 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
599 struct tid_ampdu_rx
*tid_agg_rx
)
603 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
605 /* release the buffer until next missing frame */
606 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
607 tid_agg_rx
->buf_size
;
608 if (!tid_agg_rx
->reorder_buf
[index
] &&
609 tid_agg_rx
->stored_mpdu_num
> 1) {
611 * No buffers ready to be released, but check whether any
612 * frames in the reorder buffer have timed out.
615 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
616 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
617 if (!tid_agg_rx
->reorder_buf
[j
]) {
622 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
623 HT_RX_REORDER_BUF_TIMEOUT
))
624 goto set_release_timer
;
626 #ifdef CONFIG_MAC80211_HT_DEBUG
628 wiphy_debug(hw
->wiphy
,
629 "release an RX reorder frame due to timeout on earlier frames\n");
631 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
634 * Increment the head seq# also for the skipped slots.
636 tid_agg_rx
->head_seq_num
=
637 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
640 } else while (tid_agg_rx
->reorder_buf
[index
]) {
641 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
642 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
643 tid_agg_rx
->buf_size
;
646 if (tid_agg_rx
->stored_mpdu_num
) {
647 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
648 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
650 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
651 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
652 if (tid_agg_rx
->reorder_buf
[j
])
658 mod_timer(&tid_agg_rx
->reorder_timer
,
659 tid_agg_rx
->reorder_time
[j
] + 1 +
660 HT_RX_REORDER_BUF_TIMEOUT
);
662 del_timer(&tid_agg_rx
->reorder_timer
);
667 * As this function belongs to the RX path it must be under
668 * rcu_read_lock protection. It returns false if the frame
669 * can be processed immediately, true if it was consumed.
671 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
672 struct tid_ampdu_rx
*tid_agg_rx
,
675 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
676 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
677 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
678 u16 head_seq_num
, buf_size
;
682 spin_lock(&tid_agg_rx
->reorder_lock
);
684 buf_size
= tid_agg_rx
->buf_size
;
685 head_seq_num
= tid_agg_rx
->head_seq_num
;
687 /* frame with out of date sequence number */
688 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
694 * If frame the sequence number exceeds our buffering window
695 * size release some previous frames to make room for this one.
697 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
698 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
699 /* release stored frames up to new head to stack */
700 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
703 /* Now the new frame is always in the range of the reordering buffer */
705 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
707 /* check if we already stored this frame */
708 if (tid_agg_rx
->reorder_buf
[index
]) {
714 * If the current MPDU is in the right order and nothing else
715 * is stored we can process it directly, no need to buffer it.
716 * If it is first but there's something stored, we may be able
717 * to release frames after this one.
719 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
720 tid_agg_rx
->stored_mpdu_num
== 0) {
721 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
726 /* put the frame in the reordering buffer */
727 tid_agg_rx
->reorder_buf
[index
] = skb
;
728 tid_agg_rx
->reorder_time
[index
] = jiffies
;
729 tid_agg_rx
->stored_mpdu_num
++;
730 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
733 spin_unlock(&tid_agg_rx
->reorder_lock
);
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
741 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
743 struct sk_buff
*skb
= rx
->skb
;
744 struct ieee80211_local
*local
= rx
->local
;
745 struct ieee80211_hw
*hw
= &local
->hw
;
746 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
747 struct sta_info
*sta
= rx
->sta
;
748 struct tid_ampdu_rx
*tid_agg_rx
;
752 if (!ieee80211_is_data_qos(hdr
->frame_control
))
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
763 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
765 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
769 /* qos null data frames are excluded */
770 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
773 /* new, potentially un-ordered, ampdu frame - process it */
775 /* reset session timer */
776 if (tid_agg_rx
->timeout
)
777 mod_timer(&tid_agg_rx
->session_timer
,
778 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc
= le16_to_cpu(hdr
->seq_ctrl
);
782 if (sc
& IEEE80211_SCTL_FRAG
) {
783 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
784 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
785 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
796 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
800 skb_queue_tail(&local
->rx_skb_queue
, skb
);
803 static ieee80211_rx_result debug_noinline
804 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
806 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
807 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
811 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
812 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
814 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
815 rx
->local
->dot11FrameDuplicateCount
++;
816 rx
->sta
->num_duplicates
++;
818 return RX_DROP_UNUSABLE
;
820 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
823 if (unlikely(rx
->skb
->len
< 16)) {
824 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
825 return RX_DROP_MONITOR
;
828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
837 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
838 return ieee80211_rx_mesh_check(rx
);
840 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
841 ieee80211_is_pspoll(hdr
->frame_control
)) &&
842 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
843 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
844 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
845 if (rx
->sta
&& rx
->sta
->dummy
&&
846 ieee80211_is_data_present(hdr
->frame_control
)) {
850 payload
= rx
->skb
->data
+
851 ieee80211_hdrlen(hdr
->frame_control
);
852 ethertype
= (payload
[6] << 8) | payload
[7];
853 if (cpu_to_be16(ethertype
) ==
854 rx
->sdata
->control_port_protocol
)
857 return RX_DROP_MONITOR
;
864 static ieee80211_rx_result debug_noinline
865 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
867 struct sk_buff
*skb
= rx
->skb
;
868 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
869 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
872 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
873 struct ieee80211_key
*sta_ptk
= NULL
;
874 int mmie_keyidx
= -1;
880 * There are four types of keys:
882 * - IGTK (group keys for management frames)
883 * - PTK (pairwise keys)
884 * - STK (station-to-station pairwise keys)
886 * When selecting a key, we have to distinguish between multicast
887 * (including broadcast) and unicast frames, the latter can only
888 * use PTKs and STKs while the former always use GTKs and IGTKs.
889 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890 * unicast frames can also use key indices like GTKs. Hence, if we
891 * don't have a PTK/STK we check the key index for a WEP key.
893 * Note that in a regular BSS, multicast frames are sent by the
894 * AP only, associated stations unicast the frame to the AP first
895 * which then multicasts it on their behalf.
897 * There is also a slight problem in IBSS mode: GTKs are negotiated
898 * with each station, that is something we don't currently handle.
899 * The spec seems to expect that one negotiates the same key with
900 * every station but there's no such requirement; VLANs could be
905 * No point in finding a key and decrypting if the frame is neither
906 * addressed to us nor a multicast frame.
908 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
911 /* start without a key */
915 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
917 fc
= hdr
->frame_control
;
919 if (!ieee80211_has_protected(fc
))
920 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
922 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
924 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
925 (status
->flag
& RX_FLAG_IV_STRIPPED
))
927 /* Skip decryption if the frame is not protected. */
928 if (!ieee80211_has_protected(fc
))
930 } else if (mmie_keyidx
>= 0) {
931 /* Broadcast/multicast robust management frame / BIP */
932 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
933 (status
->flag
& RX_FLAG_IV_STRIPPED
))
936 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
937 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
938 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
940 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
942 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
943 } else if (!ieee80211_has_protected(fc
)) {
945 * The frame was not protected, so skip decryption. However, we
946 * need to set rx->key if there is a key that could have been
947 * used so that the frame may be dropped if encryption would
948 * have been expected.
950 struct ieee80211_key
*key
= NULL
;
951 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
954 if (ieee80211_is_mgmt(fc
) &&
955 is_multicast_ether_addr(hdr
->addr1
) &&
956 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
960 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
961 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
967 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
968 key
= rcu_dereference(sdata
->keys
[i
]);
980 * The device doesn't give us the IV so we won't be
981 * able to look up the key. That's ok though, we
982 * don't need to decrypt the frame, we just won't
983 * be able to keep statistics accurate.
984 * Except for key threshold notifications, should
985 * we somehow allow the driver to tell us which key
986 * the hardware used if this flag is set?
988 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
989 (status
->flag
& RX_FLAG_IV_STRIPPED
))
992 hdrlen
= ieee80211_hdrlen(fc
);
994 if (rx
->skb
->len
< 8 + hdrlen
)
995 return RX_DROP_UNUSABLE
; /* TODO: count this? */
998 * no need to call ieee80211_wep_get_keyidx,
999 * it verifies a bunch of things we've done already
1001 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1002 keyidx
= keyid
>> 6;
1004 /* check per-station GTK first, if multicast packet */
1005 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1006 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1008 /* if not found, try default key */
1010 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1013 * RSNA-protected unicast frames should always be
1014 * sent with pairwise or station-to-station keys,
1015 * but for WEP we allow using a key index as well.
1018 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1019 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1020 !is_multicast_ether_addr(hdr
->addr1
))
1026 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1027 return RX_DROP_MONITOR
;
1029 rx
->key
->tx_rx_count
++;
1030 /* TODO: add threshold stuff again */
1032 return RX_DROP_MONITOR
;
1035 if (skb_linearize(rx
->skb
))
1036 return RX_DROP_UNUSABLE
;
1037 /* the hdr variable is invalid now! */
1039 switch (rx
->key
->conf
.cipher
) {
1040 case WLAN_CIPHER_SUITE_WEP40
:
1041 case WLAN_CIPHER_SUITE_WEP104
:
1042 /* Check for weak IVs if possible */
1043 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1044 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1045 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1046 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1047 rx
->sta
->wep_weak_iv_count
++;
1049 result
= ieee80211_crypto_wep_decrypt(rx
);
1051 case WLAN_CIPHER_SUITE_TKIP
:
1052 result
= ieee80211_crypto_tkip_decrypt(rx
);
1054 case WLAN_CIPHER_SUITE_CCMP
:
1055 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1057 case WLAN_CIPHER_SUITE_AES_CMAC
:
1058 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1062 * We can reach here only with HW-only algorithms
1063 * but why didn't it decrypt the frame?!
1065 return RX_DROP_UNUSABLE
;
1068 /* either the frame has been decrypted or will be dropped */
1069 status
->flag
|= RX_FLAG_DECRYPTED
;
1074 static ieee80211_rx_result debug_noinline
1075 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1077 struct ieee80211_local
*local
;
1078 struct ieee80211_hdr
*hdr
;
1079 struct sk_buff
*skb
;
1083 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1085 if (!local
->pspolling
)
1088 if (!ieee80211_has_fromds(hdr
->frame_control
))
1089 /* this is not from AP */
1092 if (!ieee80211_is_data(hdr
->frame_control
))
1095 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1096 /* AP has no more frames buffered for us */
1097 local
->pspolling
= false;
1101 /* more data bit is set, let's request a new frame from the AP */
1102 ieee80211_send_pspoll(local
, rx
->sdata
);
1107 static void ap_sta_ps_start(struct sta_info
*sta
)
1109 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1110 struct ieee80211_local
*local
= sdata
->local
;
1112 atomic_inc(&sdata
->bss
->num_sta_ps
);
1113 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1114 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1115 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1116 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1117 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1118 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1119 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1122 static void ap_sta_ps_end(struct sta_info
*sta
)
1124 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1126 atomic_dec(&sdata
->bss
->num_sta_ps
);
1128 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1129 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1130 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1131 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1134 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1135 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1136 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1137 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1141 ieee80211_sta_ps_deliver_wakeup(sta
);
1144 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1146 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1149 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1151 /* Don't let the same PS state be set twice */
1152 in_ps
= test_sta_flags(sta_inf
, WLAN_STA_PS_STA
);
1153 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1157 ap_sta_ps_start(sta_inf
);
1159 ap_sta_ps_end(sta_inf
);
1163 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1165 static ieee80211_rx_result debug_noinline
1166 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1168 struct sta_info
*sta
= rx
->sta
;
1169 struct sk_buff
*skb
= rx
->skb
;
1170 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1171 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1177 * Update last_rx only for IBSS packets which are for the current
1178 * BSSID to avoid keeping the current IBSS network alive in cases
1179 * where other STAs start using different BSSID.
1181 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1182 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1183 NL80211_IFTYPE_ADHOC
);
1184 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1185 sta
->last_rx
= jiffies
;
1186 if (ieee80211_is_data(hdr
->frame_control
)) {
1187 sta
->last_rx_rate_idx
= status
->rate_idx
;
1188 sta
->last_rx_rate_flag
= status
->flag
;
1191 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1193 * Mesh beacons will update last_rx when if they are found to
1194 * match the current local configuration when processed.
1196 sta
->last_rx
= jiffies
;
1197 if (ieee80211_is_data(hdr
->frame_control
)) {
1198 sta
->last_rx_rate_idx
= status
->rate_idx
;
1199 sta
->last_rx_rate_flag
= status
->flag
;
1203 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1206 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1207 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1209 sta
->rx_fragments
++;
1210 sta
->rx_bytes
+= rx
->skb
->len
;
1211 sta
->last_signal
= status
->signal
;
1212 ewma_add(&sta
->avg_signal
, -status
->signal
);
1215 * Change STA power saving mode only at the end of a frame
1216 * exchange sequence.
1218 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1219 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1220 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1221 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1222 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1223 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1225 * Ignore doze->wake transitions that are
1226 * indicated by non-data frames, the standard
1227 * is unclear here, but for example going to
1228 * PS mode and then scanning would cause a
1229 * doze->wake transition for the probe request,
1230 * and that is clearly undesirable.
1232 if (ieee80211_is_data(hdr
->frame_control
) &&
1233 !ieee80211_has_pm(hdr
->frame_control
))
1236 if (ieee80211_has_pm(hdr
->frame_control
))
1237 ap_sta_ps_start(sta
);
1242 * Drop (qos-)data::nullfunc frames silently, since they
1243 * are used only to control station power saving mode.
1245 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1246 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1247 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1250 * If we receive a 4-addr nullfunc frame from a STA
1251 * that was not moved to a 4-addr STA vlan yet, drop
1252 * the frame to the monitor interface, to make sure
1253 * that hostapd sees it
1255 if (ieee80211_has_a4(hdr
->frame_control
) &&
1256 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1257 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1258 !rx
->sdata
->u
.vlan
.sta
)))
1259 return RX_DROP_MONITOR
;
1261 * Update counter and free packet here to avoid
1262 * counting this as a dropped packed.
1265 dev_kfree_skb(rx
->skb
);
1270 } /* ieee80211_rx_h_sta_process */
1272 static inline struct ieee80211_fragment_entry
*
1273 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1274 unsigned int frag
, unsigned int seq
, int rx_queue
,
1275 struct sk_buff
**skb
)
1277 struct ieee80211_fragment_entry
*entry
;
1280 idx
= sdata
->fragment_next
;
1281 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1282 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1283 sdata
->fragment_next
= 0;
1285 if (!skb_queue_empty(&entry
->skb_list
)) {
1286 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1287 struct ieee80211_hdr
*hdr
=
1288 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1289 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1290 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1291 "addr1=%pM addr2=%pM\n",
1293 jiffies
- entry
->first_frag_time
, entry
->seq
,
1294 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1296 __skb_queue_purge(&entry
->skb_list
);
1299 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1301 entry
->first_frag_time
= jiffies
;
1303 entry
->rx_queue
= rx_queue
;
1304 entry
->last_frag
= frag
;
1306 entry
->extra_len
= 0;
1311 static inline struct ieee80211_fragment_entry
*
1312 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1313 unsigned int frag
, unsigned int seq
,
1314 int rx_queue
, struct ieee80211_hdr
*hdr
)
1316 struct ieee80211_fragment_entry
*entry
;
1319 idx
= sdata
->fragment_next
;
1320 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1321 struct ieee80211_hdr
*f_hdr
;
1325 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1327 entry
= &sdata
->fragments
[idx
];
1328 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1329 entry
->rx_queue
!= rx_queue
||
1330 entry
->last_frag
+ 1 != frag
)
1333 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1336 * Check ftype and addresses are equal, else check next fragment
1338 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1339 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1340 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1341 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1344 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1345 __skb_queue_purge(&entry
->skb_list
);
1354 static ieee80211_rx_result debug_noinline
1355 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1357 struct ieee80211_hdr
*hdr
;
1360 unsigned int frag
, seq
;
1361 struct ieee80211_fragment_entry
*entry
;
1362 struct sk_buff
*skb
;
1363 struct ieee80211_rx_status
*status
;
1365 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1366 fc
= hdr
->frame_control
;
1367 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1368 frag
= sc
& IEEE80211_SCTL_FRAG
;
1370 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1371 (rx
->skb
)->len
< 24 ||
1372 is_multicast_ether_addr(hdr
->addr1
))) {
1373 /* not fragmented */
1376 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1378 if (skb_linearize(rx
->skb
))
1379 return RX_DROP_UNUSABLE
;
1382 * skb_linearize() might change the skb->data and
1383 * previously cached variables (in this case, hdr) need to
1384 * be refreshed with the new data.
1386 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1387 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1390 /* This is the first fragment of a new frame. */
1391 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1392 rx
->seqno_idx
, &(rx
->skb
));
1393 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1394 ieee80211_has_protected(fc
)) {
1395 int queue
= rx
->security_idx
;
1396 /* Store CCMP PN so that we can verify that the next
1397 * fragment has a sequential PN value. */
1399 memcpy(entry
->last_pn
,
1400 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1406 /* This is a fragment for a frame that should already be pending in
1407 * fragment cache. Add this fragment to the end of the pending entry.
1409 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1410 rx
->seqno_idx
, hdr
);
1412 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1413 return RX_DROP_MONITOR
;
1416 /* Verify that MPDUs within one MSDU have sequential PN values.
1417 * (IEEE 802.11i, 8.3.3.4.5) */
1420 u8 pn
[CCMP_PN_LEN
], *rpn
;
1422 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1423 return RX_DROP_UNUSABLE
;
1424 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1425 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1430 queue
= rx
->security_idx
;
1431 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1432 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1433 return RX_DROP_UNUSABLE
;
1434 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1437 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1438 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1439 entry
->last_frag
= frag
;
1440 entry
->extra_len
+= rx
->skb
->len
;
1441 if (ieee80211_has_morefrags(fc
)) {
1446 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1447 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1448 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1449 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1451 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1452 __skb_queue_purge(&entry
->skb_list
);
1453 return RX_DROP_UNUSABLE
;
1456 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1457 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1461 /* Complete frame has been reassembled - process it now */
1462 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1463 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1467 rx
->sta
->rx_packets
++;
1468 if (is_multicast_ether_addr(hdr
->addr1
))
1469 rx
->local
->dot11MulticastReceivedFrameCount
++;
1471 ieee80211_led_rx(rx
->local
);
1475 static ieee80211_rx_result debug_noinline
1476 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1478 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1479 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1480 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1482 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1483 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
)))
1486 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1487 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1488 return RX_DROP_UNUSABLE
;
1490 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1491 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1493 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1495 /* Free PS Poll skb here instead of returning RX_DROP that would
1496 * count as an dropped frame. */
1497 dev_kfree_skb(rx
->skb
);
1502 static ieee80211_rx_result debug_noinline
1503 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1505 u8
*data
= rx
->skb
->data
;
1506 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1508 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1511 /* remove the qos control field, update frame type and meta-data */
1512 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1513 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1514 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1515 /* change frame type to non QOS */
1516 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1522 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1524 if (unlikely(!rx
->sta
||
1525 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1532 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1534 struct sk_buff
*skb
= rx
->skb
;
1535 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1538 * Pass through unencrypted frames if the hardware has
1539 * decrypted them already.
1541 if (status
->flag
& RX_FLAG_DECRYPTED
)
1544 /* Drop unencrypted frames if key is set. */
1545 if (unlikely(!ieee80211_has_protected(fc
) &&
1546 !ieee80211_is_nullfunc(fc
) &&
1547 ieee80211_is_data(fc
) &&
1548 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1555 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1557 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1558 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1559 __le16 fc
= hdr
->frame_control
;
1562 * Pass through unencrypted frames if the hardware has
1563 * decrypted them already.
1565 if (status
->flag
& RX_FLAG_DECRYPTED
)
1568 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1569 if (unlikely(!ieee80211_has_protected(fc
) &&
1570 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1572 if (ieee80211_is_deauth(fc
))
1573 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1576 else if (ieee80211_is_disassoc(fc
))
1577 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1582 /* BIP does not use Protected field, so need to check MMIE */
1583 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1584 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1585 if (ieee80211_is_deauth(fc
))
1586 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1589 else if (ieee80211_is_disassoc(fc
))
1590 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1596 * When using MFP, Action frames are not allowed prior to
1597 * having configured keys.
1599 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1600 ieee80211_is_robust_mgmt_frame(
1601 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1609 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1611 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1612 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1613 bool check_port_control
= false;
1614 struct ethhdr
*ehdr
;
1617 *port_control
= false;
1618 if (ieee80211_has_a4(hdr
->frame_control
) &&
1619 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1622 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1623 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1625 if (!sdata
->u
.mgd
.use_4addr
)
1628 check_port_control
= true;
1631 if (is_multicast_ether_addr(hdr
->addr1
) &&
1632 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1635 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1639 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1640 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1641 *port_control
= true;
1642 else if (check_port_control
)
1649 * requires that rx->skb is a frame with ethernet header
1651 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1653 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1654 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1655 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1658 * Allow EAPOL frames to us/the PAE group address regardless
1659 * of whether the frame was encrypted or not.
1661 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1662 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1663 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1666 if (ieee80211_802_1x_port_control(rx
) ||
1667 ieee80211_drop_unencrypted(rx
, fc
))
1674 * requires that rx->skb is a frame with ethernet header
1677 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1679 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1680 struct net_device
*dev
= sdata
->dev
;
1681 struct sk_buff
*skb
, *xmit_skb
;
1682 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1683 struct sta_info
*dsta
;
1684 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1689 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1690 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1691 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1692 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1693 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1694 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1696 * send multicast frames both to higher layers in
1697 * local net stack and back to the wireless medium
1699 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1700 if (!xmit_skb
&& net_ratelimit())
1701 printk(KERN_DEBUG
"%s: failed to clone "
1702 "multicast frame\n", dev
->name
);
1704 dsta
= sta_info_get(sdata
, skb
->data
);
1707 * The destination station is associated to
1708 * this AP (in this VLAN), so send the frame
1709 * directly to it and do not pass it to local
1719 int align __maybe_unused
;
1721 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1723 * 'align' will only take the values 0 or 2 here
1724 * since all frames are required to be aligned
1725 * to 2-byte boundaries when being passed to
1726 * mac80211. That also explains the __skb_push()
1729 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1731 if (WARN_ON(skb_headroom(skb
) < 3)) {
1735 u8
*data
= skb
->data
;
1736 size_t len
= skb_headlen(skb
);
1738 memmove(skb
->data
, data
, len
);
1739 skb_set_tail_pointer(skb
, len
);
1745 /* deliver to local stack */
1746 skb
->protocol
= eth_type_trans(skb
, dev
);
1747 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1748 netif_receive_skb(skb
);
1753 /* send to wireless media */
1754 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1755 skb_reset_network_header(xmit_skb
);
1756 skb_reset_mac_header(xmit_skb
);
1757 dev_queue_xmit(xmit_skb
);
1761 static ieee80211_rx_result debug_noinline
1762 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1764 struct net_device
*dev
= rx
->sdata
->dev
;
1765 struct sk_buff
*skb
= rx
->skb
;
1766 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1767 __le16 fc
= hdr
->frame_control
;
1768 struct sk_buff_head frame_list
;
1769 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1771 if (unlikely(!ieee80211_is_data(fc
)))
1774 if (unlikely(!ieee80211_is_data_present(fc
)))
1775 return RX_DROP_MONITOR
;
1777 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1780 if (ieee80211_has_a4(hdr
->frame_control
) &&
1781 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1782 !rx
->sdata
->u
.vlan
.sta
)
1783 return RX_DROP_UNUSABLE
;
1785 if (is_multicast_ether_addr(hdr
->addr1
) &&
1786 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1787 rx
->sdata
->u
.vlan
.sta
) ||
1788 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1789 rx
->sdata
->u
.mgd
.use_4addr
)))
1790 return RX_DROP_UNUSABLE
;
1793 __skb_queue_head_init(&frame_list
);
1795 if (skb_linearize(skb
))
1796 return RX_DROP_UNUSABLE
;
1798 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1799 rx
->sdata
->vif
.type
,
1800 rx
->local
->hw
.extra_tx_headroom
, true);
1802 while (!skb_queue_empty(&frame_list
)) {
1803 rx
->skb
= __skb_dequeue(&frame_list
);
1805 if (!ieee80211_frame_allowed(rx
, fc
)) {
1806 dev_kfree_skb(rx
->skb
);
1809 dev
->stats
.rx_packets
++;
1810 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1812 ieee80211_deliver_skb(rx
);
1818 #ifdef CONFIG_MAC80211_MESH
1819 static ieee80211_rx_result
1820 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1822 struct ieee80211_hdr
*hdr
;
1823 struct ieee80211s_hdr
*mesh_hdr
;
1824 unsigned int hdrlen
;
1825 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1826 struct ieee80211_local
*local
= rx
->local
;
1827 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1828 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1830 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1831 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1832 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1834 /* frame is in RMC, don't forward */
1835 if (ieee80211_is_data(hdr
->frame_control
) &&
1836 is_multicast_ether_addr(hdr
->addr1
) &&
1837 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1838 return RX_DROP_MONITOR
;
1840 if (!ieee80211_is_data(hdr
->frame_control
))
1845 return RX_DROP_MONITOR
;
1847 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1848 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1849 dropped_frames_congestion
);
1850 return RX_DROP_MONITOR
;
1853 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1854 struct mesh_path
*mppath
;
1858 if (is_multicast_ether_addr(hdr
->addr1
)) {
1859 mpp_addr
= hdr
->addr3
;
1860 proxied_addr
= mesh_hdr
->eaddr1
;
1862 mpp_addr
= hdr
->addr4
;
1863 proxied_addr
= mesh_hdr
->eaddr2
;
1867 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1869 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1871 spin_lock_bh(&mppath
->state_lock
);
1872 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1873 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1874 spin_unlock_bh(&mppath
->state_lock
);
1879 /* Frame has reached destination. Don't forward */
1880 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1881 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1886 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1888 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1889 dropped_frames_ttl
);
1891 struct ieee80211_hdr
*fwd_hdr
;
1892 struct ieee80211_tx_info
*info
;
1894 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1896 if (!fwd_skb
&& net_ratelimit())
1897 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1902 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1903 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1904 info
= IEEE80211_SKB_CB(fwd_skb
);
1905 memset(info
, 0, sizeof(*info
));
1906 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1907 info
->control
.vif
= &rx
->sdata
->vif
;
1908 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1909 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1911 skb_set_queue_mapping(fwd_skb
,
1912 ieee80211_select_queue(sdata
, fwd_skb
));
1913 ieee80211_set_qos_hdr(sdata
, fwd_skb
);
1917 * Save TA to addr1 to send TA a path error if a
1918 * suitable next hop is not found
1920 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1922 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1923 /* Failed to immediately resolve next hop:
1924 * fwded frame was dropped or will be added
1925 * later to the pending skb queue. */
1927 return RX_DROP_MONITOR
;
1929 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1932 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1934 ieee80211_add_pending_skb(local
, fwd_skb
);
1939 if (is_multicast_ether_addr(hdr
->addr1
) ||
1940 sdata
->dev
->flags
& IFF_PROMISC
)
1943 return RX_DROP_MONITOR
;
1947 static ieee80211_rx_result debug_noinline
1948 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1950 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1951 struct ieee80211_local
*local
= rx
->local
;
1952 struct net_device
*dev
= sdata
->dev
;
1953 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1954 __le16 fc
= hdr
->frame_control
;
1958 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1961 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1962 return RX_DROP_MONITOR
;
1965 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1966 * that a 4-addr station can be detected and moved into a separate VLAN
1968 if (ieee80211_has_a4(hdr
->frame_control
) &&
1969 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1970 return RX_DROP_MONITOR
;
1972 err
= __ieee80211_data_to_8023(rx
, &port_control
);
1974 return RX_DROP_UNUSABLE
;
1976 if (!ieee80211_frame_allowed(rx
, fc
))
1977 return RX_DROP_MONITOR
;
1979 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1980 unlikely(port_control
) && sdata
->bss
) {
1981 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1989 dev
->stats
.rx_packets
++;
1990 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1992 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
1993 !is_multicast_ether_addr(
1994 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
1995 (!local
->scanning
&&
1996 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
1997 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1998 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2001 ieee80211_deliver_skb(rx
);
2006 static ieee80211_rx_result debug_noinline
2007 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2009 struct ieee80211_local
*local
= rx
->local
;
2010 struct ieee80211_hw
*hw
= &local
->hw
;
2011 struct sk_buff
*skb
= rx
->skb
;
2012 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2013 struct tid_ampdu_rx
*tid_agg_rx
;
2017 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2020 if (ieee80211_is_back_req(bar
->frame_control
)) {
2022 __le16 control
, start_seq_num
;
2023 } __packed bar_data
;
2026 return RX_DROP_MONITOR
;
2028 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2029 &bar_data
, sizeof(bar_data
)))
2030 return RX_DROP_MONITOR
;
2032 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2034 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2036 return RX_DROP_MONITOR
;
2038 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2040 /* reset session timer */
2041 if (tid_agg_rx
->timeout
)
2042 mod_timer(&tid_agg_rx
->session_timer
,
2043 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2045 spin_lock(&tid_agg_rx
->reorder_lock
);
2046 /* release stored frames up to start of BAR */
2047 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2048 spin_unlock(&tid_agg_rx
->reorder_lock
);
2055 * After this point, we only want management frames,
2056 * so we can drop all remaining control frames to
2057 * cooked monitor interfaces.
2059 return RX_DROP_MONITOR
;
2062 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2063 struct ieee80211_mgmt
*mgmt
,
2066 struct ieee80211_local
*local
= sdata
->local
;
2067 struct sk_buff
*skb
;
2068 struct ieee80211_mgmt
*resp
;
2070 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2071 /* Not to own unicast address */
2075 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2076 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2077 /* Not from the current AP or not associated yet. */
2081 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2082 /* Too short SA Query request frame */
2086 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2090 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2091 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2092 memset(resp
, 0, 24);
2093 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2094 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2095 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2096 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2097 IEEE80211_STYPE_ACTION
);
2098 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2099 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2100 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2101 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2102 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2103 WLAN_SA_QUERY_TR_ID_LEN
);
2105 ieee80211_tx_skb(sdata
, skb
);
2108 static ieee80211_rx_result debug_noinline
2109 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2111 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2112 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2115 * From here on, look only at management frames.
2116 * Data and control frames are already handled,
2117 * and unknown (reserved) frames are useless.
2119 if (rx
->skb
->len
< 24)
2120 return RX_DROP_MONITOR
;
2122 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2123 return RX_DROP_MONITOR
;
2125 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2126 return RX_DROP_MONITOR
;
2128 if (ieee80211_drop_unencrypted_mgmt(rx
))
2129 return RX_DROP_UNUSABLE
;
2134 static ieee80211_rx_result debug_noinline
2135 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2137 struct ieee80211_local
*local
= rx
->local
;
2138 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2139 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2140 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2141 int len
= rx
->skb
->len
;
2143 if (!ieee80211_is_action(mgmt
->frame_control
))
2146 /* drop too small frames */
2147 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2148 return RX_DROP_UNUSABLE
;
2150 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2151 return RX_DROP_UNUSABLE
;
2153 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2154 return RX_DROP_UNUSABLE
;
2156 switch (mgmt
->u
.action
.category
) {
2157 case WLAN_CATEGORY_BACK
:
2159 * The aggregation code is not prepared to handle
2160 * anything but STA/AP due to the BSSID handling;
2161 * IBSS could work in the code but isn't supported
2162 * by drivers or the standard.
2164 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2165 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2166 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2169 /* verify action_code is present */
2170 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2173 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2174 case WLAN_ACTION_ADDBA_REQ
:
2175 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2176 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2179 case WLAN_ACTION_ADDBA_RESP
:
2180 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2181 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2184 case WLAN_ACTION_DELBA
:
2185 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2186 sizeof(mgmt
->u
.action
.u
.delba
)))
2194 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2195 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2198 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2201 /* verify action_code is present */
2202 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2205 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2206 case WLAN_ACTION_SPCT_MSR_REQ
:
2207 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2208 sizeof(mgmt
->u
.action
.u
.measurement
)))
2210 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2212 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2213 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2214 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2217 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2220 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2226 case WLAN_CATEGORY_SA_QUERY
:
2227 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2228 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2231 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2232 case WLAN_ACTION_SA_QUERY_REQUEST
:
2233 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2235 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2239 case WLAN_CATEGORY_SELF_PROTECTED
:
2240 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2241 case WLAN_SP_MESH_PEERING_OPEN
:
2242 case WLAN_SP_MESH_PEERING_CLOSE
:
2243 case WLAN_SP_MESH_PEERING_CONFIRM
:
2244 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2246 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2247 /* userspace handles this frame */
2250 case WLAN_SP_MGK_INFORM
:
2251 case WLAN_SP_MGK_ACK
:
2252 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2257 case WLAN_CATEGORY_MESH_ACTION
:
2258 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2260 if (mesh_action_is_path_sel(mgmt
) &&
2261 (!mesh_path_sel_is_hwmp(sdata
)))
2269 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2270 /* will return in the next handlers */
2275 rx
->sta
->rx_packets
++;
2276 dev_kfree_skb(rx
->skb
);
2280 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2281 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2282 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2284 rx
->sta
->rx_packets
++;
2288 static ieee80211_rx_result debug_noinline
2289 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2291 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2293 /* skip known-bad action frames and return them in the next handler */
2294 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2298 * Getting here means the kernel doesn't know how to handle
2299 * it, but maybe userspace does ... include returned frames
2300 * so userspace can register for those to know whether ones
2301 * it transmitted were processed or returned.
2304 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2305 rx
->skb
->data
, rx
->skb
->len
,
2308 rx
->sta
->rx_packets
++;
2309 dev_kfree_skb(rx
->skb
);
2317 static ieee80211_rx_result debug_noinline
2318 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2320 struct ieee80211_local
*local
= rx
->local
;
2321 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2322 struct sk_buff
*nskb
;
2323 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2324 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2326 if (!ieee80211_is_action(mgmt
->frame_control
))
2330 * For AP mode, hostapd is responsible for handling any action
2331 * frames that we didn't handle, including returning unknown
2332 * ones. For all other modes we will return them to the sender,
2333 * setting the 0x80 bit in the action category, as required by
2334 * 802.11-2007 7.3.1.11.
2335 * Newer versions of hostapd shall also use the management frame
2336 * registration mechanisms, but older ones still use cooked
2337 * monitor interfaces so push all frames there.
2339 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2340 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2341 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2342 return RX_DROP_MONITOR
;
2344 /* do not return rejected action frames */
2345 if (mgmt
->u
.action
.category
& 0x80)
2346 return RX_DROP_UNUSABLE
;
2348 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2351 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2353 nmgmt
->u
.action
.category
|= 0x80;
2354 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2355 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2357 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2359 ieee80211_tx_skb(rx
->sdata
, nskb
);
2361 dev_kfree_skb(rx
->skb
);
2365 static ieee80211_rx_result debug_noinline
2366 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2368 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2369 ieee80211_rx_result rxs
;
2370 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2373 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2374 if (rxs
!= RX_CONTINUE
)
2377 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2379 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2380 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2381 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2382 return RX_DROP_MONITOR
;
2385 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2386 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2387 /* process for all: mesh, mlme, ibss */
2389 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2390 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2391 if (is_multicast_ether_addr(mgmt
->da
) &&
2392 !is_broadcast_ether_addr(mgmt
->da
))
2393 return RX_DROP_MONITOR
;
2395 /* process only for station */
2396 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2397 return RX_DROP_MONITOR
;
2399 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2400 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2401 /* process only for ibss */
2402 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2403 return RX_DROP_MONITOR
;
2406 return RX_DROP_MONITOR
;
2409 /* queue up frame and kick off work to process it */
2410 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2411 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2412 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2414 rx
->sta
->rx_packets
++;
2419 /* TODO: use IEEE80211_RX_FRAGMENTED */
2420 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2421 struct ieee80211_rate
*rate
)
2423 struct ieee80211_sub_if_data
*sdata
;
2424 struct ieee80211_local
*local
= rx
->local
;
2425 struct ieee80211_rtap_hdr
{
2426 struct ieee80211_radiotap_header hdr
;
2432 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2433 struct net_device
*prev_dev
= NULL
;
2434 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2437 * If cooked monitor has been processed already, then
2438 * don't do it again. If not, set the flag.
2440 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2442 rx
->flags
|= IEEE80211_RX_CMNTR
;
2444 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2445 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2448 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2449 memset(rthdr
, 0, sizeof(*rthdr
));
2450 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2451 rthdr
->hdr
.it_present
=
2452 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2453 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2456 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2457 rthdr
->hdr
.it_present
|=
2458 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2460 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2462 if (status
->band
== IEEE80211_BAND_5GHZ
)
2463 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2464 IEEE80211_CHAN_5GHZ
);
2466 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2467 IEEE80211_CHAN_2GHZ
);
2469 skb_set_mac_header(skb
, 0);
2470 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2471 skb
->pkt_type
= PACKET_OTHERHOST
;
2472 skb
->protocol
= htons(ETH_P_802_2
);
2474 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2475 if (!ieee80211_sdata_running(sdata
))
2478 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2479 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2483 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2485 skb2
->dev
= prev_dev
;
2486 netif_receive_skb(skb2
);
2490 prev_dev
= sdata
->dev
;
2491 sdata
->dev
->stats
.rx_packets
++;
2492 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2496 skb
->dev
= prev_dev
;
2497 netif_receive_skb(skb
);
2505 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2506 ieee80211_rx_result res
)
2509 case RX_DROP_MONITOR
:
2510 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2512 rx
->sta
->rx_dropped
++;
2515 struct ieee80211_rate
*rate
= NULL
;
2516 struct ieee80211_supported_band
*sband
;
2517 struct ieee80211_rx_status
*status
;
2519 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2521 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2522 if (!(status
->flag
& RX_FLAG_HT
))
2523 rate
= &sband
->bitrates
[status
->rate_idx
];
2525 ieee80211_rx_cooked_monitor(rx
, rate
);
2528 case RX_DROP_UNUSABLE
:
2529 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2531 rx
->sta
->rx_dropped
++;
2532 dev_kfree_skb(rx
->skb
);
2535 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2540 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2542 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2543 struct sk_buff
*skb
;
2545 #define CALL_RXH(rxh) \
2548 if (res != RX_CONTINUE) \
2552 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2553 if (rx
->local
->running_rx_handler
)
2556 rx
->local
->running_rx_handler
= true;
2558 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2559 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2562 * all the other fields are valid across frames
2563 * that belong to an aMPDU since they are on the
2564 * same TID from the same station
2568 CALL_RXH(ieee80211_rx_h_decrypt
)
2569 CALL_RXH(ieee80211_rx_h_check_more_data
)
2570 CALL_RXH(ieee80211_rx_h_sta_process
)
2571 CALL_RXH(ieee80211_rx_h_defragment
)
2572 CALL_RXH(ieee80211_rx_h_ps_poll
)
2573 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2574 /* must be after MMIC verify so header is counted in MPDU mic */
2575 #ifdef CONFIG_MAC80211_MESH
2576 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2577 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2579 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2580 CALL_RXH(ieee80211_rx_h_amsdu
)
2581 CALL_RXH(ieee80211_rx_h_data
)
2582 CALL_RXH(ieee80211_rx_h_ctrl
);
2583 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2584 CALL_RXH(ieee80211_rx_h_action
)
2585 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2586 CALL_RXH(ieee80211_rx_h_action_return
)
2587 CALL_RXH(ieee80211_rx_h_mgmt
)
2590 ieee80211_rx_handlers_result(rx
, res
);
2591 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2595 rx
->local
->running_rx_handler
= false;
2598 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2601 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2603 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2605 #define CALL_RXH(rxh) \
2608 if (res != RX_CONTINUE) \
2612 CALL_RXH(ieee80211_rx_h_passive_scan
)
2613 CALL_RXH(ieee80211_rx_h_check
)
2615 ieee80211_rx_reorder_ampdu(rx
);
2617 ieee80211_rx_handlers(rx
);
2621 ieee80211_rx_handlers_result(rx
, res
);
2627 * This function makes calls into the RX path, therefore
2628 * it has to be invoked under RCU read lock.
2630 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2632 struct ieee80211_rx_data rx
= {
2634 .sdata
= sta
->sdata
,
2635 .local
= sta
->local
,
2636 /* This is OK -- must be QoS data frame */
2637 .security_idx
= tid
,
2641 struct tid_ampdu_rx
*tid_agg_rx
;
2643 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2647 spin_lock(&tid_agg_rx
->reorder_lock
);
2648 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2649 spin_unlock(&tid_agg_rx
->reorder_lock
);
2651 ieee80211_rx_handlers(&rx
);
2654 /* main receive path */
2656 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2657 struct ieee80211_hdr
*hdr
)
2659 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2660 struct sk_buff
*skb
= rx
->skb
;
2661 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2662 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2663 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2665 switch (sdata
->vif
.type
) {
2666 case NL80211_IFTYPE_STATION
:
2667 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2670 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2671 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2672 sdata
->u
.mgd
.use_4addr
)
2674 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2677 case NL80211_IFTYPE_ADHOC
:
2680 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2683 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2684 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2686 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2687 } else if (!multicast
&&
2688 compare_ether_addr(sdata
->vif
.addr
,
2690 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2692 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2693 } else if (!rx
->sta
) {
2695 if (status
->flag
& RX_FLAG_HT
)
2696 rate_idx
= 0; /* TODO: HT rates */
2698 rate_idx
= status
->rate_idx
;
2699 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2700 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2703 case NL80211_IFTYPE_MESH_POINT
:
2705 compare_ether_addr(sdata
->vif
.addr
,
2707 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2710 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2713 case NL80211_IFTYPE_AP_VLAN
:
2714 case NL80211_IFTYPE_AP
:
2716 if (compare_ether_addr(sdata
->vif
.addr
,
2719 } else if (!ieee80211_bssid_match(bssid
,
2721 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2722 !ieee80211_is_beacon(hdr
->frame_control
) &&
2723 !(ieee80211_is_action(hdr
->frame_control
) &&
2726 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2729 case NL80211_IFTYPE_WDS
:
2730 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2732 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2736 /* should never get here */
2745 * This function returns whether or not the SKB
2746 * was destined for RX processing or not, which,
2747 * if consume is true, is equivalent to whether
2748 * or not the skb was consumed.
2750 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2751 struct sk_buff
*skb
, bool consume
)
2753 struct ieee80211_local
*local
= rx
->local
;
2754 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2755 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2756 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2760 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2761 prepares
= prepare_for_handlers(rx
, hdr
);
2767 skb
= skb_copy(skb
, GFP_ATOMIC
);
2769 if (net_ratelimit())
2770 wiphy_debug(local
->hw
.wiphy
,
2771 "failed to copy skb for %s\n",
2779 ieee80211_invoke_rx_handlers(rx
);
2784 * This is the actual Rx frames handler. as it blongs to Rx path it must
2785 * be called with rcu_read_lock protection.
2787 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2788 struct sk_buff
*skb
)
2790 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2791 struct ieee80211_local
*local
= hw_to_local(hw
);
2792 struct ieee80211_sub_if_data
*sdata
;
2793 struct ieee80211_hdr
*hdr
;
2795 struct ieee80211_rx_data rx
;
2796 struct ieee80211_sub_if_data
*prev
;
2797 struct sta_info
*sta
, *tmp
, *prev_sta
;
2800 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2801 memset(&rx
, 0, sizeof(rx
));
2805 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2806 local
->dot11ReceivedFragmentCount
++;
2808 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2809 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2810 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2812 if (ieee80211_is_mgmt(fc
))
2813 err
= skb_linearize(skb
);
2815 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2822 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2823 ieee80211_parse_qos(&rx
);
2824 ieee80211_verify_alignment(&rx
);
2826 if (ieee80211_is_data(fc
)) {
2829 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2836 rx
.sdata
= prev_sta
->sdata
;
2837 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2844 rx
.sdata
= prev_sta
->sdata
;
2846 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2854 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2855 if (!ieee80211_sdata_running(sdata
))
2858 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2859 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2863 * frame is destined for this interface, but if it's
2864 * not also for the previous one we handle that after
2865 * the loop to avoid copying the SKB once too much
2873 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2875 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2881 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2884 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2893 * This is the receive path handler. It is called by a low level driver when an
2894 * 802.11 MPDU is received from the hardware.
2896 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2898 struct ieee80211_local
*local
= hw_to_local(hw
);
2899 struct ieee80211_rate
*rate
= NULL
;
2900 struct ieee80211_supported_band
*sband
;
2901 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2903 WARN_ON_ONCE(softirq_count() == 0);
2905 if (WARN_ON(status
->band
< 0 ||
2906 status
->band
>= IEEE80211_NUM_BANDS
))
2909 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2910 if (WARN_ON(!sband
))
2914 * If we're suspending, it is possible although not too likely
2915 * that we'd be receiving frames after having already partially
2916 * quiesced the stack. We can't process such frames then since
2917 * that might, for example, cause stations to be added or other
2918 * driver callbacks be invoked.
2920 if (unlikely(local
->quiescing
|| local
->suspended
))
2924 * The same happens when we're not even started,
2925 * but that's worth a warning.
2927 if (WARN_ON(!local
->started
))
2930 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2932 * Validate the rate, unless a PLCP error means that
2933 * we probably can't have a valid rate here anyway.
2936 if (status
->flag
& RX_FLAG_HT
) {
2938 * rate_idx is MCS index, which can be [0-76]
2941 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2943 * Anything else would be some sort of driver or
2944 * hardware error. The driver should catch hardware
2947 if (WARN((status
->rate_idx
< 0 ||
2948 status
->rate_idx
> 76),
2949 "Rate marked as an HT rate but passed "
2950 "status->rate_idx is not "
2951 "an MCS index [0-76]: %d (0x%02x)\n",
2956 if (WARN_ON(status
->rate_idx
< 0 ||
2957 status
->rate_idx
>= sband
->n_bitrates
))
2959 rate
= &sband
->bitrates
[status
->rate_idx
];
2963 status
->rx_flags
= 0;
2966 * key references and virtual interfaces are protected using RCU
2967 * and this requires that we are in a read-side RCU section during
2968 * receive processing
2973 * Frames with failed FCS/PLCP checksum are not returned,
2974 * all other frames are returned without radiotap header
2975 * if it was previously present.
2976 * Also, frames with less than 16 bytes are dropped.
2978 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2984 ieee80211_tpt_led_trig_rx(local
,
2985 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
2987 __ieee80211_rx_handle_packet(hw
, skb
);
2995 EXPORT_SYMBOL(ieee80211_rx
);
2997 /* This is a version of the rx handler that can be called from hard irq
2998 * context. Post the skb on the queue and schedule the tasklet */
2999 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3001 struct ieee80211_local
*local
= hw_to_local(hw
);
3003 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3005 skb
->pkt_type
= IEEE80211_RX_MSG
;
3006 skb_queue_tail(&local
->skb_queue
, skb
);
3007 tasklet_schedule(&local
->tasklet
);
3009 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);