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_flag(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_flag(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_flag(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_flag(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_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1168 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1169 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1170 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1173 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1176 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1177 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1181 * The device handles station powersave, so don't do anything about
1182 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1183 * it to mac80211 since they're handled.)
1185 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1189 * Don't do anything if the station isn't already asleep. In
1190 * the uAPSD case, the station will probably be marked asleep,
1191 * in the PS-Poll case the station must be confused ...
1193 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1196 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1197 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1198 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1199 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1201 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1204 /* Free PS Poll skb here instead of returning RX_DROP that would
1205 * count as an dropped frame. */
1206 dev_kfree_skb(rx
->skb
);
1209 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1210 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1211 ieee80211_has_pm(hdr
->frame_control
) &&
1212 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1213 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1214 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1215 ac
= ieee802_1d_to_ac
[tid
& 7];
1218 * If this AC is not trigger-enabled do nothing.
1220 * NB: This could/should check a separate bitmap of trigger-
1221 * enabled queues, but for now we only implement uAPSD w/o
1222 * TSPEC changes to the ACs, so they're always the same.
1224 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1227 /* if we are in a service period, do nothing */
1228 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1231 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1232 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1234 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1240 static ieee80211_rx_result debug_noinline
1241 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1243 struct sta_info
*sta
= rx
->sta
;
1244 struct sk_buff
*skb
= rx
->skb
;
1245 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1246 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1252 * Update last_rx only for IBSS packets which are for the current
1253 * BSSID to avoid keeping the current IBSS network alive in cases
1254 * where other STAs start using different BSSID.
1256 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1257 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1258 NL80211_IFTYPE_ADHOC
);
1259 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1260 sta
->last_rx
= jiffies
;
1261 if (ieee80211_is_data(hdr
->frame_control
)) {
1262 sta
->last_rx_rate_idx
= status
->rate_idx
;
1263 sta
->last_rx_rate_flag
= status
->flag
;
1266 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1268 * Mesh beacons will update last_rx when if they are found to
1269 * match the current local configuration when processed.
1271 sta
->last_rx
= jiffies
;
1272 if (ieee80211_is_data(hdr
->frame_control
)) {
1273 sta
->last_rx_rate_idx
= status
->rate_idx
;
1274 sta
->last_rx_rate_flag
= status
->flag
;
1278 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1281 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1282 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1284 sta
->rx_fragments
++;
1285 sta
->rx_bytes
+= rx
->skb
->len
;
1286 sta
->last_signal
= status
->signal
;
1287 ewma_add(&sta
->avg_signal
, -status
->signal
);
1290 * Change STA power saving mode only at the end of a frame
1291 * exchange sequence.
1293 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1294 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1295 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1296 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1297 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1298 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1300 * Ignore doze->wake transitions that are
1301 * indicated by non-data frames, the standard
1302 * is unclear here, but for example going to
1303 * PS mode and then scanning would cause a
1304 * doze->wake transition for the probe request,
1305 * and that is clearly undesirable.
1307 if (ieee80211_is_data(hdr
->frame_control
) &&
1308 !ieee80211_has_pm(hdr
->frame_control
))
1311 if (ieee80211_has_pm(hdr
->frame_control
))
1312 ap_sta_ps_start(sta
);
1317 * Drop (qos-)data::nullfunc frames silently, since they
1318 * are used only to control station power saving mode.
1320 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1321 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1322 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1325 * If we receive a 4-addr nullfunc frame from a STA
1326 * that was not moved to a 4-addr STA vlan yet, drop
1327 * the frame to the monitor interface, to make sure
1328 * that hostapd sees it
1330 if (ieee80211_has_a4(hdr
->frame_control
) &&
1331 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1332 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1333 !rx
->sdata
->u
.vlan
.sta
)))
1334 return RX_DROP_MONITOR
;
1336 * Update counter and free packet here to avoid
1337 * counting this as a dropped packed.
1340 dev_kfree_skb(rx
->skb
);
1345 } /* ieee80211_rx_h_sta_process */
1347 static inline struct ieee80211_fragment_entry
*
1348 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1349 unsigned int frag
, unsigned int seq
, int rx_queue
,
1350 struct sk_buff
**skb
)
1352 struct ieee80211_fragment_entry
*entry
;
1355 idx
= sdata
->fragment_next
;
1356 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1357 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1358 sdata
->fragment_next
= 0;
1360 if (!skb_queue_empty(&entry
->skb_list
)) {
1361 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1362 struct ieee80211_hdr
*hdr
=
1363 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1364 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1365 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1366 "addr1=%pM addr2=%pM\n",
1368 jiffies
- entry
->first_frag_time
, entry
->seq
,
1369 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1371 __skb_queue_purge(&entry
->skb_list
);
1374 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1376 entry
->first_frag_time
= jiffies
;
1378 entry
->rx_queue
= rx_queue
;
1379 entry
->last_frag
= frag
;
1381 entry
->extra_len
= 0;
1386 static inline struct ieee80211_fragment_entry
*
1387 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1388 unsigned int frag
, unsigned int seq
,
1389 int rx_queue
, struct ieee80211_hdr
*hdr
)
1391 struct ieee80211_fragment_entry
*entry
;
1394 idx
= sdata
->fragment_next
;
1395 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1396 struct ieee80211_hdr
*f_hdr
;
1400 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1402 entry
= &sdata
->fragments
[idx
];
1403 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1404 entry
->rx_queue
!= rx_queue
||
1405 entry
->last_frag
+ 1 != frag
)
1408 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1411 * Check ftype and addresses are equal, else check next fragment
1413 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1414 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1415 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1416 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1419 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1420 __skb_queue_purge(&entry
->skb_list
);
1429 static ieee80211_rx_result debug_noinline
1430 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1432 struct ieee80211_hdr
*hdr
;
1435 unsigned int frag
, seq
;
1436 struct ieee80211_fragment_entry
*entry
;
1437 struct sk_buff
*skb
;
1438 struct ieee80211_rx_status
*status
;
1440 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1441 fc
= hdr
->frame_control
;
1442 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1443 frag
= sc
& IEEE80211_SCTL_FRAG
;
1445 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1446 (rx
->skb
)->len
< 24 ||
1447 is_multicast_ether_addr(hdr
->addr1
))) {
1448 /* not fragmented */
1451 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1453 if (skb_linearize(rx
->skb
))
1454 return RX_DROP_UNUSABLE
;
1457 * skb_linearize() might change the skb->data and
1458 * previously cached variables (in this case, hdr) need to
1459 * be refreshed with the new data.
1461 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1462 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1465 /* This is the first fragment of a new frame. */
1466 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1467 rx
->seqno_idx
, &(rx
->skb
));
1468 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1469 ieee80211_has_protected(fc
)) {
1470 int queue
= rx
->security_idx
;
1471 /* Store CCMP PN so that we can verify that the next
1472 * fragment has a sequential PN value. */
1474 memcpy(entry
->last_pn
,
1475 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1481 /* This is a fragment for a frame that should already be pending in
1482 * fragment cache. Add this fragment to the end of the pending entry.
1484 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1485 rx
->seqno_idx
, hdr
);
1487 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1488 return RX_DROP_MONITOR
;
1491 /* Verify that MPDUs within one MSDU have sequential PN values.
1492 * (IEEE 802.11i, 8.3.3.4.5) */
1495 u8 pn
[CCMP_PN_LEN
], *rpn
;
1497 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1498 return RX_DROP_UNUSABLE
;
1499 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1500 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1505 queue
= rx
->security_idx
;
1506 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1507 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1508 return RX_DROP_UNUSABLE
;
1509 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1512 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1513 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1514 entry
->last_frag
= frag
;
1515 entry
->extra_len
+= rx
->skb
->len
;
1516 if (ieee80211_has_morefrags(fc
)) {
1521 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1522 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1523 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1524 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1526 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1527 __skb_queue_purge(&entry
->skb_list
);
1528 return RX_DROP_UNUSABLE
;
1531 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1532 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1536 /* Complete frame has been reassembled - process it now */
1537 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1538 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1542 rx
->sta
->rx_packets
++;
1543 if (is_multicast_ether_addr(hdr
->addr1
))
1544 rx
->local
->dot11MulticastReceivedFrameCount
++;
1546 ieee80211_led_rx(rx
->local
);
1550 static ieee80211_rx_result debug_noinline
1551 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1553 u8
*data
= rx
->skb
->data
;
1554 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1556 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1559 /* remove the qos control field, update frame type and meta-data */
1560 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1561 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1562 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1563 /* change frame type to non QOS */
1564 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1570 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1572 if (unlikely(!rx
->sta
||
1573 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1580 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1582 struct sk_buff
*skb
= rx
->skb
;
1583 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1586 * Pass through unencrypted frames if the hardware has
1587 * decrypted them already.
1589 if (status
->flag
& RX_FLAG_DECRYPTED
)
1592 /* Drop unencrypted frames if key is set. */
1593 if (unlikely(!ieee80211_has_protected(fc
) &&
1594 !ieee80211_is_nullfunc(fc
) &&
1595 ieee80211_is_data(fc
) &&
1596 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1603 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1605 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1606 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1607 __le16 fc
= hdr
->frame_control
;
1610 * Pass through unencrypted frames if the hardware has
1611 * decrypted them already.
1613 if (status
->flag
& RX_FLAG_DECRYPTED
)
1616 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1617 if (unlikely(!ieee80211_has_protected(fc
) &&
1618 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
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
,
1630 /* BIP does not use Protected field, so need to check MMIE */
1631 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1632 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1633 if (ieee80211_is_deauth(fc
))
1634 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1637 else if (ieee80211_is_disassoc(fc
))
1638 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1644 * When using MFP, Action frames are not allowed prior to
1645 * having configured keys.
1647 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1648 ieee80211_is_robust_mgmt_frame(
1649 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1657 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1659 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1660 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1661 bool check_port_control
= false;
1662 struct ethhdr
*ehdr
;
1665 *port_control
= false;
1666 if (ieee80211_has_a4(hdr
->frame_control
) &&
1667 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1670 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1671 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1673 if (!sdata
->u
.mgd
.use_4addr
)
1676 check_port_control
= true;
1679 if (is_multicast_ether_addr(hdr
->addr1
) &&
1680 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1683 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1687 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1688 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1689 *port_control
= true;
1690 else if (check_port_control
)
1697 * requires that rx->skb is a frame with ethernet header
1699 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1701 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1702 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1703 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1706 * Allow EAPOL frames to us/the PAE group address regardless
1707 * of whether the frame was encrypted or not.
1709 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1710 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1711 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1714 if (ieee80211_802_1x_port_control(rx
) ||
1715 ieee80211_drop_unencrypted(rx
, fc
))
1722 * requires that rx->skb is a frame with ethernet header
1725 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1727 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1728 struct net_device
*dev
= sdata
->dev
;
1729 struct sk_buff
*skb
, *xmit_skb
;
1730 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1731 struct sta_info
*dsta
;
1732 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1737 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1738 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1739 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1740 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1741 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1742 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1744 * send multicast frames both to higher layers in
1745 * local net stack and back to the wireless medium
1747 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1748 if (!xmit_skb
&& net_ratelimit())
1749 printk(KERN_DEBUG
"%s: failed to clone "
1750 "multicast frame\n", dev
->name
);
1752 dsta
= sta_info_get(sdata
, skb
->data
);
1755 * The destination station is associated to
1756 * this AP (in this VLAN), so send the frame
1757 * directly to it and do not pass it to local
1767 int align __maybe_unused
;
1769 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1771 * 'align' will only take the values 0 or 2 here
1772 * since all frames are required to be aligned
1773 * to 2-byte boundaries when being passed to
1774 * mac80211. That also explains the __skb_push()
1777 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1779 if (WARN_ON(skb_headroom(skb
) < 3)) {
1783 u8
*data
= skb
->data
;
1784 size_t len
= skb_headlen(skb
);
1786 memmove(skb
->data
, data
, len
);
1787 skb_set_tail_pointer(skb
, len
);
1793 /* deliver to local stack */
1794 skb
->protocol
= eth_type_trans(skb
, dev
);
1795 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1796 netif_receive_skb(skb
);
1801 /* send to wireless media */
1802 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1803 skb_reset_network_header(xmit_skb
);
1804 skb_reset_mac_header(xmit_skb
);
1805 dev_queue_xmit(xmit_skb
);
1809 static ieee80211_rx_result debug_noinline
1810 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1812 struct net_device
*dev
= rx
->sdata
->dev
;
1813 struct sk_buff
*skb
= rx
->skb
;
1814 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1815 __le16 fc
= hdr
->frame_control
;
1816 struct sk_buff_head frame_list
;
1817 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1819 if (unlikely(!ieee80211_is_data(fc
)))
1822 if (unlikely(!ieee80211_is_data_present(fc
)))
1823 return RX_DROP_MONITOR
;
1825 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1828 if (ieee80211_has_a4(hdr
->frame_control
) &&
1829 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1830 !rx
->sdata
->u
.vlan
.sta
)
1831 return RX_DROP_UNUSABLE
;
1833 if (is_multicast_ether_addr(hdr
->addr1
) &&
1834 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1835 rx
->sdata
->u
.vlan
.sta
) ||
1836 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1837 rx
->sdata
->u
.mgd
.use_4addr
)))
1838 return RX_DROP_UNUSABLE
;
1841 __skb_queue_head_init(&frame_list
);
1843 if (skb_linearize(skb
))
1844 return RX_DROP_UNUSABLE
;
1846 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1847 rx
->sdata
->vif
.type
,
1848 rx
->local
->hw
.extra_tx_headroom
, true);
1850 while (!skb_queue_empty(&frame_list
)) {
1851 rx
->skb
= __skb_dequeue(&frame_list
);
1853 if (!ieee80211_frame_allowed(rx
, fc
)) {
1854 dev_kfree_skb(rx
->skb
);
1857 dev
->stats
.rx_packets
++;
1858 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1860 ieee80211_deliver_skb(rx
);
1866 #ifdef CONFIG_MAC80211_MESH
1867 static ieee80211_rx_result
1868 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1870 struct ieee80211_hdr
*hdr
;
1871 struct ieee80211s_hdr
*mesh_hdr
;
1872 unsigned int hdrlen
;
1873 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1874 struct ieee80211_local
*local
= rx
->local
;
1875 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1876 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1878 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1879 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1880 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1882 /* frame is in RMC, don't forward */
1883 if (ieee80211_is_data(hdr
->frame_control
) &&
1884 is_multicast_ether_addr(hdr
->addr1
) &&
1885 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1886 return RX_DROP_MONITOR
;
1888 if (!ieee80211_is_data(hdr
->frame_control
))
1893 return RX_DROP_MONITOR
;
1895 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1896 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1897 dropped_frames_congestion
);
1898 return RX_DROP_MONITOR
;
1901 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1902 struct mesh_path
*mppath
;
1906 if (is_multicast_ether_addr(hdr
->addr1
)) {
1907 mpp_addr
= hdr
->addr3
;
1908 proxied_addr
= mesh_hdr
->eaddr1
;
1910 mpp_addr
= hdr
->addr4
;
1911 proxied_addr
= mesh_hdr
->eaddr2
;
1915 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1917 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1919 spin_lock_bh(&mppath
->state_lock
);
1920 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1921 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1922 spin_unlock_bh(&mppath
->state_lock
);
1927 /* Frame has reached destination. Don't forward */
1928 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1929 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1934 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1936 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1937 dropped_frames_ttl
);
1939 struct ieee80211_hdr
*fwd_hdr
;
1940 struct ieee80211_tx_info
*info
;
1942 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1944 if (!fwd_skb
&& net_ratelimit())
1945 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1950 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1951 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1952 info
= IEEE80211_SKB_CB(fwd_skb
);
1953 memset(info
, 0, sizeof(*info
));
1954 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1955 info
->control
.vif
= &rx
->sdata
->vif
;
1956 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1957 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1959 skb_set_queue_mapping(fwd_skb
,
1960 ieee80211_select_queue(sdata
, fwd_skb
));
1961 ieee80211_set_qos_hdr(sdata
, fwd_skb
);
1965 * Save TA to addr1 to send TA a path error if a
1966 * suitable next hop is not found
1968 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1970 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1971 /* Failed to immediately resolve next hop:
1972 * fwded frame was dropped or will be added
1973 * later to the pending skb queue. */
1975 return RX_DROP_MONITOR
;
1977 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1980 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1982 ieee80211_add_pending_skb(local
, fwd_skb
);
1987 if (is_multicast_ether_addr(hdr
->addr1
) ||
1988 sdata
->dev
->flags
& IFF_PROMISC
)
1991 return RX_DROP_MONITOR
;
1995 static ieee80211_rx_result debug_noinline
1996 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1998 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1999 struct ieee80211_local
*local
= rx
->local
;
2000 struct net_device
*dev
= sdata
->dev
;
2001 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2002 __le16 fc
= hdr
->frame_control
;
2006 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2009 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2010 return RX_DROP_MONITOR
;
2013 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2014 * that a 4-addr station can be detected and moved into a separate VLAN
2016 if (ieee80211_has_a4(hdr
->frame_control
) &&
2017 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2018 return RX_DROP_MONITOR
;
2020 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2022 return RX_DROP_UNUSABLE
;
2024 if (!ieee80211_frame_allowed(rx
, fc
))
2025 return RX_DROP_MONITOR
;
2027 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2028 unlikely(port_control
) && sdata
->bss
) {
2029 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2037 dev
->stats
.rx_packets
++;
2038 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2040 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2041 !is_multicast_ether_addr(
2042 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2043 (!local
->scanning
&&
2044 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2045 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2046 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2049 ieee80211_deliver_skb(rx
);
2054 static ieee80211_rx_result debug_noinline
2055 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2057 struct ieee80211_local
*local
= rx
->local
;
2058 struct ieee80211_hw
*hw
= &local
->hw
;
2059 struct sk_buff
*skb
= rx
->skb
;
2060 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2061 struct tid_ampdu_rx
*tid_agg_rx
;
2065 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2068 if (ieee80211_is_back_req(bar
->frame_control
)) {
2070 __le16 control
, start_seq_num
;
2071 } __packed bar_data
;
2074 return RX_DROP_MONITOR
;
2076 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2077 &bar_data
, sizeof(bar_data
)))
2078 return RX_DROP_MONITOR
;
2080 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2082 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2084 return RX_DROP_MONITOR
;
2086 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2088 /* reset session timer */
2089 if (tid_agg_rx
->timeout
)
2090 mod_timer(&tid_agg_rx
->session_timer
,
2091 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2093 spin_lock(&tid_agg_rx
->reorder_lock
);
2094 /* release stored frames up to start of BAR */
2095 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2096 spin_unlock(&tid_agg_rx
->reorder_lock
);
2103 * After this point, we only want management frames,
2104 * so we can drop all remaining control frames to
2105 * cooked monitor interfaces.
2107 return RX_DROP_MONITOR
;
2110 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2111 struct ieee80211_mgmt
*mgmt
,
2114 struct ieee80211_local
*local
= sdata
->local
;
2115 struct sk_buff
*skb
;
2116 struct ieee80211_mgmt
*resp
;
2118 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2119 /* Not to own unicast address */
2123 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2124 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2125 /* Not from the current AP or not associated yet. */
2129 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2130 /* Too short SA Query request frame */
2134 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2138 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2139 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2140 memset(resp
, 0, 24);
2141 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2142 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2143 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2144 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2145 IEEE80211_STYPE_ACTION
);
2146 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2147 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2148 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2149 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2150 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2151 WLAN_SA_QUERY_TR_ID_LEN
);
2153 ieee80211_tx_skb(sdata
, skb
);
2156 static ieee80211_rx_result debug_noinline
2157 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2159 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2160 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2163 * From here on, look only at management frames.
2164 * Data and control frames are already handled,
2165 * and unknown (reserved) frames are useless.
2167 if (rx
->skb
->len
< 24)
2168 return RX_DROP_MONITOR
;
2170 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2171 return RX_DROP_MONITOR
;
2173 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2174 return RX_DROP_MONITOR
;
2176 if (ieee80211_drop_unencrypted_mgmt(rx
))
2177 return RX_DROP_UNUSABLE
;
2182 static ieee80211_rx_result debug_noinline
2183 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2185 struct ieee80211_local
*local
= rx
->local
;
2186 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2187 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2188 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2189 int len
= rx
->skb
->len
;
2191 if (!ieee80211_is_action(mgmt
->frame_control
))
2194 /* drop too small frames */
2195 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2196 return RX_DROP_UNUSABLE
;
2198 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2199 return RX_DROP_UNUSABLE
;
2201 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2202 return RX_DROP_UNUSABLE
;
2204 switch (mgmt
->u
.action
.category
) {
2205 case WLAN_CATEGORY_BACK
:
2207 * The aggregation code is not prepared to handle
2208 * anything but STA/AP due to the BSSID handling;
2209 * IBSS could work in the code but isn't supported
2210 * by drivers or the standard.
2212 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2213 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2214 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2217 /* verify action_code is present */
2218 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2221 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2222 case WLAN_ACTION_ADDBA_REQ
:
2223 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2224 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2227 case WLAN_ACTION_ADDBA_RESP
:
2228 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2229 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2232 case WLAN_ACTION_DELBA
:
2233 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2234 sizeof(mgmt
->u
.action
.u
.delba
)))
2242 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2243 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2246 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2249 /* verify action_code is present */
2250 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2253 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2254 case WLAN_ACTION_SPCT_MSR_REQ
:
2255 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2256 sizeof(mgmt
->u
.action
.u
.measurement
)))
2258 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2260 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2261 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2262 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2265 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2268 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2274 case WLAN_CATEGORY_SA_QUERY
:
2275 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2276 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2279 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2280 case WLAN_ACTION_SA_QUERY_REQUEST
:
2281 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2283 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2287 case WLAN_CATEGORY_SELF_PROTECTED
:
2288 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2289 case WLAN_SP_MESH_PEERING_OPEN
:
2290 case WLAN_SP_MESH_PEERING_CLOSE
:
2291 case WLAN_SP_MESH_PEERING_CONFIRM
:
2292 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2294 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2295 /* userspace handles this frame */
2298 case WLAN_SP_MGK_INFORM
:
2299 case WLAN_SP_MGK_ACK
:
2300 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2305 case WLAN_CATEGORY_MESH_ACTION
:
2306 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2308 if (mesh_action_is_path_sel(mgmt
) &&
2309 (!mesh_path_sel_is_hwmp(sdata
)))
2317 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2318 /* will return in the next handlers */
2323 rx
->sta
->rx_packets
++;
2324 dev_kfree_skb(rx
->skb
);
2328 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2329 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2330 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2332 rx
->sta
->rx_packets
++;
2336 static ieee80211_rx_result debug_noinline
2337 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2339 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2341 /* skip known-bad action frames and return them in the next handler */
2342 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2346 * Getting here means the kernel doesn't know how to handle
2347 * it, but maybe userspace does ... include returned frames
2348 * so userspace can register for those to know whether ones
2349 * it transmitted were processed or returned.
2352 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2353 rx
->skb
->data
, rx
->skb
->len
,
2356 rx
->sta
->rx_packets
++;
2357 dev_kfree_skb(rx
->skb
);
2365 static ieee80211_rx_result debug_noinline
2366 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2368 struct ieee80211_local
*local
= rx
->local
;
2369 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2370 struct sk_buff
*nskb
;
2371 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2372 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2374 if (!ieee80211_is_action(mgmt
->frame_control
))
2378 * For AP mode, hostapd is responsible for handling any action
2379 * frames that we didn't handle, including returning unknown
2380 * ones. For all other modes we will return them to the sender,
2381 * setting the 0x80 bit in the action category, as required by
2382 * 802.11-2007 7.3.1.11.
2383 * Newer versions of hostapd shall also use the management frame
2384 * registration mechanisms, but older ones still use cooked
2385 * monitor interfaces so push all frames there.
2387 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2388 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2389 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2390 return RX_DROP_MONITOR
;
2392 /* do not return rejected action frames */
2393 if (mgmt
->u
.action
.category
& 0x80)
2394 return RX_DROP_UNUSABLE
;
2396 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2399 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2401 nmgmt
->u
.action
.category
|= 0x80;
2402 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2403 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2405 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2407 ieee80211_tx_skb(rx
->sdata
, nskb
);
2409 dev_kfree_skb(rx
->skb
);
2413 static ieee80211_rx_result debug_noinline
2414 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2416 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2417 ieee80211_rx_result rxs
;
2418 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2421 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2422 if (rxs
!= RX_CONTINUE
)
2425 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2427 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2428 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2429 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2430 return RX_DROP_MONITOR
;
2433 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2434 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2435 /* process for all: mesh, mlme, ibss */
2437 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2438 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2439 if (is_multicast_ether_addr(mgmt
->da
) &&
2440 !is_broadcast_ether_addr(mgmt
->da
))
2441 return RX_DROP_MONITOR
;
2443 /* process only for station */
2444 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2445 return RX_DROP_MONITOR
;
2447 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2448 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2449 /* process only for ibss */
2450 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2451 return RX_DROP_MONITOR
;
2454 return RX_DROP_MONITOR
;
2457 /* queue up frame and kick off work to process it */
2458 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2459 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2460 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2462 rx
->sta
->rx_packets
++;
2467 /* TODO: use IEEE80211_RX_FRAGMENTED */
2468 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2469 struct ieee80211_rate
*rate
)
2471 struct ieee80211_sub_if_data
*sdata
;
2472 struct ieee80211_local
*local
= rx
->local
;
2473 struct ieee80211_rtap_hdr
{
2474 struct ieee80211_radiotap_header hdr
;
2480 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2481 struct net_device
*prev_dev
= NULL
;
2482 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2485 * If cooked monitor has been processed already, then
2486 * don't do it again. If not, set the flag.
2488 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2490 rx
->flags
|= IEEE80211_RX_CMNTR
;
2492 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2493 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2496 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2497 memset(rthdr
, 0, sizeof(*rthdr
));
2498 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2499 rthdr
->hdr
.it_present
=
2500 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2501 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2504 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2505 rthdr
->hdr
.it_present
|=
2506 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2508 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2510 if (status
->band
== IEEE80211_BAND_5GHZ
)
2511 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2512 IEEE80211_CHAN_5GHZ
);
2514 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2515 IEEE80211_CHAN_2GHZ
);
2517 skb_set_mac_header(skb
, 0);
2518 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2519 skb
->pkt_type
= PACKET_OTHERHOST
;
2520 skb
->protocol
= htons(ETH_P_802_2
);
2522 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2523 if (!ieee80211_sdata_running(sdata
))
2526 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2527 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2531 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2533 skb2
->dev
= prev_dev
;
2534 netif_receive_skb(skb2
);
2538 prev_dev
= sdata
->dev
;
2539 sdata
->dev
->stats
.rx_packets
++;
2540 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2544 skb
->dev
= prev_dev
;
2545 netif_receive_skb(skb
);
2553 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2554 ieee80211_rx_result res
)
2557 case RX_DROP_MONITOR
:
2558 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2560 rx
->sta
->rx_dropped
++;
2563 struct ieee80211_rate
*rate
= NULL
;
2564 struct ieee80211_supported_band
*sband
;
2565 struct ieee80211_rx_status
*status
;
2567 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2569 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2570 if (!(status
->flag
& RX_FLAG_HT
))
2571 rate
= &sband
->bitrates
[status
->rate_idx
];
2573 ieee80211_rx_cooked_monitor(rx
, rate
);
2576 case RX_DROP_UNUSABLE
:
2577 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2579 rx
->sta
->rx_dropped
++;
2580 dev_kfree_skb(rx
->skb
);
2583 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2588 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2590 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2591 struct sk_buff
*skb
;
2593 #define CALL_RXH(rxh) \
2596 if (res != RX_CONTINUE) \
2600 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2601 if (rx
->local
->running_rx_handler
)
2604 rx
->local
->running_rx_handler
= true;
2606 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2607 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2610 * all the other fields are valid across frames
2611 * that belong to an aMPDU since they are on the
2612 * same TID from the same station
2616 CALL_RXH(ieee80211_rx_h_decrypt
)
2617 CALL_RXH(ieee80211_rx_h_check_more_data
)
2618 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2619 CALL_RXH(ieee80211_rx_h_sta_process
)
2620 CALL_RXH(ieee80211_rx_h_defragment
)
2621 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2622 /* must be after MMIC verify so header is counted in MPDU mic */
2623 #ifdef CONFIG_MAC80211_MESH
2624 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2625 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2627 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2628 CALL_RXH(ieee80211_rx_h_amsdu
)
2629 CALL_RXH(ieee80211_rx_h_data
)
2630 CALL_RXH(ieee80211_rx_h_ctrl
);
2631 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2632 CALL_RXH(ieee80211_rx_h_action
)
2633 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2634 CALL_RXH(ieee80211_rx_h_action_return
)
2635 CALL_RXH(ieee80211_rx_h_mgmt
)
2638 ieee80211_rx_handlers_result(rx
, res
);
2639 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2643 rx
->local
->running_rx_handler
= false;
2646 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2649 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2651 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2653 #define CALL_RXH(rxh) \
2656 if (res != RX_CONTINUE) \
2660 CALL_RXH(ieee80211_rx_h_passive_scan
)
2661 CALL_RXH(ieee80211_rx_h_check
)
2663 ieee80211_rx_reorder_ampdu(rx
);
2665 ieee80211_rx_handlers(rx
);
2669 ieee80211_rx_handlers_result(rx
, res
);
2675 * This function makes calls into the RX path, therefore
2676 * it has to be invoked under RCU read lock.
2678 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2680 struct ieee80211_rx_data rx
= {
2682 .sdata
= sta
->sdata
,
2683 .local
= sta
->local
,
2684 /* This is OK -- must be QoS data frame */
2685 .security_idx
= tid
,
2689 struct tid_ampdu_rx
*tid_agg_rx
;
2691 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2695 spin_lock(&tid_agg_rx
->reorder_lock
);
2696 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2697 spin_unlock(&tid_agg_rx
->reorder_lock
);
2699 ieee80211_rx_handlers(&rx
);
2702 /* main receive path */
2704 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2705 struct ieee80211_hdr
*hdr
)
2707 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2708 struct sk_buff
*skb
= rx
->skb
;
2709 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2710 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2711 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2713 switch (sdata
->vif
.type
) {
2714 case NL80211_IFTYPE_STATION
:
2715 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2718 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2719 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2720 sdata
->u
.mgd
.use_4addr
)
2722 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2725 case NL80211_IFTYPE_ADHOC
:
2728 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2731 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2732 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2734 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2735 } else if (!multicast
&&
2736 compare_ether_addr(sdata
->vif
.addr
,
2738 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2740 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2741 } else if (!rx
->sta
) {
2743 if (status
->flag
& RX_FLAG_HT
)
2744 rate_idx
= 0; /* TODO: HT rates */
2746 rate_idx
= status
->rate_idx
;
2747 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2748 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2751 case NL80211_IFTYPE_MESH_POINT
:
2753 compare_ether_addr(sdata
->vif
.addr
,
2755 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2758 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2761 case NL80211_IFTYPE_AP_VLAN
:
2762 case NL80211_IFTYPE_AP
:
2764 if (compare_ether_addr(sdata
->vif
.addr
,
2767 } else if (!ieee80211_bssid_match(bssid
,
2769 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2770 !ieee80211_is_beacon(hdr
->frame_control
) &&
2771 !(ieee80211_is_action(hdr
->frame_control
) &&
2774 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2777 case NL80211_IFTYPE_WDS
:
2778 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2780 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2784 /* should never get here */
2793 * This function returns whether or not the SKB
2794 * was destined for RX processing or not, which,
2795 * if consume is true, is equivalent to whether
2796 * or not the skb was consumed.
2798 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2799 struct sk_buff
*skb
, bool consume
)
2801 struct ieee80211_local
*local
= rx
->local
;
2802 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2803 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2804 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2808 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2809 prepares
= prepare_for_handlers(rx
, hdr
);
2815 skb
= skb_copy(skb
, GFP_ATOMIC
);
2817 if (net_ratelimit())
2818 wiphy_debug(local
->hw
.wiphy
,
2819 "failed to copy skb for %s\n",
2827 ieee80211_invoke_rx_handlers(rx
);
2832 * This is the actual Rx frames handler. as it blongs to Rx path it must
2833 * be called with rcu_read_lock protection.
2835 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2836 struct sk_buff
*skb
)
2838 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2839 struct ieee80211_local
*local
= hw_to_local(hw
);
2840 struct ieee80211_sub_if_data
*sdata
;
2841 struct ieee80211_hdr
*hdr
;
2843 struct ieee80211_rx_data rx
;
2844 struct ieee80211_sub_if_data
*prev
;
2845 struct sta_info
*sta
, *tmp
, *prev_sta
;
2848 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2849 memset(&rx
, 0, sizeof(rx
));
2853 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2854 local
->dot11ReceivedFragmentCount
++;
2856 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2857 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2858 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2860 if (ieee80211_is_mgmt(fc
))
2861 err
= skb_linearize(skb
);
2863 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2870 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2871 ieee80211_parse_qos(&rx
);
2872 ieee80211_verify_alignment(&rx
);
2874 if (ieee80211_is_data(fc
)) {
2877 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2884 rx
.sdata
= prev_sta
->sdata
;
2885 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2892 rx
.sdata
= prev_sta
->sdata
;
2894 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2902 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2903 if (!ieee80211_sdata_running(sdata
))
2906 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2907 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2911 * frame is destined for this interface, but if it's
2912 * not also for the previous one we handle that after
2913 * the loop to avoid copying the SKB once too much
2921 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2923 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2929 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2932 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2941 * This is the receive path handler. It is called by a low level driver when an
2942 * 802.11 MPDU is received from the hardware.
2944 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2946 struct ieee80211_local
*local
= hw_to_local(hw
);
2947 struct ieee80211_rate
*rate
= NULL
;
2948 struct ieee80211_supported_band
*sband
;
2949 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2951 WARN_ON_ONCE(softirq_count() == 0);
2953 if (WARN_ON(status
->band
< 0 ||
2954 status
->band
>= IEEE80211_NUM_BANDS
))
2957 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2958 if (WARN_ON(!sband
))
2962 * If we're suspending, it is possible although not too likely
2963 * that we'd be receiving frames after having already partially
2964 * quiesced the stack. We can't process such frames then since
2965 * that might, for example, cause stations to be added or other
2966 * driver callbacks be invoked.
2968 if (unlikely(local
->quiescing
|| local
->suspended
))
2972 * The same happens when we're not even started,
2973 * but that's worth a warning.
2975 if (WARN_ON(!local
->started
))
2978 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2980 * Validate the rate, unless a PLCP error means that
2981 * we probably can't have a valid rate here anyway.
2984 if (status
->flag
& RX_FLAG_HT
) {
2986 * rate_idx is MCS index, which can be [0-76]
2989 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2991 * Anything else would be some sort of driver or
2992 * hardware error. The driver should catch hardware
2995 if (WARN((status
->rate_idx
< 0 ||
2996 status
->rate_idx
> 76),
2997 "Rate marked as an HT rate but passed "
2998 "status->rate_idx is not "
2999 "an MCS index [0-76]: %d (0x%02x)\n",
3004 if (WARN_ON(status
->rate_idx
< 0 ||
3005 status
->rate_idx
>= sband
->n_bitrates
))
3007 rate
= &sband
->bitrates
[status
->rate_idx
];
3011 status
->rx_flags
= 0;
3014 * key references and virtual interfaces are protected using RCU
3015 * and this requires that we are in a read-side RCU section during
3016 * receive processing
3021 * Frames with failed FCS/PLCP checksum are not returned,
3022 * all other frames are returned without radiotap header
3023 * if it was previously present.
3024 * Also, frames with less than 16 bytes are dropped.
3026 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3032 ieee80211_tpt_led_trig_rx(local
,
3033 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3035 __ieee80211_rx_handle_packet(hw
, skb
);
3043 EXPORT_SYMBOL(ieee80211_rx
);
3045 /* This is a version of the rx handler that can be called from hard irq
3046 * context. Post the skb on the queue and schedule the tasklet */
3047 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3049 struct ieee80211_local
*local
= hw_to_local(hw
);
3051 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3053 skb
->pkt_type
= IEEE80211_RX_MSG
;
3054 skb_queue_tail(&local
->skb_queue
, skb
);
3055 tasklet_schedule(&local
->tasklet
);
3057 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);