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 ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
748 struct sta_info
*sta
= rx
->sta
;
749 struct tid_ampdu_rx
*tid_agg_rx
;
753 if (!ieee80211_is_data_qos(hdr
->frame_control
))
757 * filter the QoS data rx stream according to
758 * STA/TID and check if this STA/TID is on aggregation
764 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
765 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
766 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
768 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
772 /* qos null data frames are excluded */
773 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
776 /* not part of a BA session */
777 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
778 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
781 /* not actually part of this BA session */
782 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
785 /* new, potentially un-ordered, ampdu frame - process it */
787 /* reset session timer */
788 if (tid_agg_rx
->timeout
)
789 mod_timer(&tid_agg_rx
->session_timer
,
790 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
792 /* if this mpdu is fragmented - terminate rx aggregation session */
793 sc
= le16_to_cpu(hdr
->seq_ctrl
);
794 if (sc
& IEEE80211_SCTL_FRAG
) {
795 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
796 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
797 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
802 * No locking needed -- we will only ever process one
803 * RX packet at a time, and thus own tid_agg_rx. All
804 * other code manipulating it needs to (and does) make
805 * sure that we cannot get to it any more before doing
808 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
812 skb_queue_tail(&local
->rx_skb_queue
, skb
);
815 static ieee80211_rx_result debug_noinline
816 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
818 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
819 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
821 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
822 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
823 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
824 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
826 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
827 rx
->local
->dot11FrameDuplicateCount
++;
828 rx
->sta
->num_duplicates
++;
830 return RX_DROP_UNUSABLE
;
832 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
835 if (unlikely(rx
->skb
->len
< 16)) {
836 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
837 return RX_DROP_MONITOR
;
840 /* Drop disallowed frame classes based on STA auth/assoc state;
841 * IEEE 802.11, Chap 5.5.
843 * mac80211 filters only based on association state, i.e. it drops
844 * Class 3 frames from not associated stations. hostapd sends
845 * deauth/disassoc frames when needed. In addition, hostapd is
846 * responsible for filtering on both auth and assoc states.
849 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
850 return ieee80211_rx_mesh_check(rx
);
852 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
853 ieee80211_is_pspoll(hdr
->frame_control
)) &&
854 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
855 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
856 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
857 if (rx
->sta
&& rx
->sta
->dummy
&&
858 ieee80211_is_data_present(hdr
->frame_control
)) {
862 payload
= rx
->skb
->data
+
863 ieee80211_hdrlen(hdr
->frame_control
);
864 ethertype
= (payload
[6] << 8) | payload
[7];
865 if (cpu_to_be16(ethertype
) ==
866 rx
->sdata
->control_port_protocol
)
870 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
871 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
874 return RX_DROP_UNUSABLE
;
876 return RX_DROP_MONITOR
;
883 static ieee80211_rx_result debug_noinline
884 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
886 struct sk_buff
*skb
= rx
->skb
;
887 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
888 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
891 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
892 struct ieee80211_key
*sta_ptk
= NULL
;
893 int mmie_keyidx
= -1;
899 * There are four types of keys:
901 * - IGTK (group keys for management frames)
902 * - PTK (pairwise keys)
903 * - STK (station-to-station pairwise keys)
905 * When selecting a key, we have to distinguish between multicast
906 * (including broadcast) and unicast frames, the latter can only
907 * use PTKs and STKs while the former always use GTKs and IGTKs.
908 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
909 * unicast frames can also use key indices like GTKs. Hence, if we
910 * don't have a PTK/STK we check the key index for a WEP key.
912 * Note that in a regular BSS, multicast frames are sent by the
913 * AP only, associated stations unicast the frame to the AP first
914 * which then multicasts it on their behalf.
916 * There is also a slight problem in IBSS mode: GTKs are negotiated
917 * with each station, that is something we don't currently handle.
918 * The spec seems to expect that one negotiates the same key with
919 * every station but there's no such requirement; VLANs could be
924 * No point in finding a key and decrypting if the frame is neither
925 * addressed to us nor a multicast frame.
927 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
930 /* start without a key */
934 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
936 fc
= hdr
->frame_control
;
938 if (!ieee80211_has_protected(fc
))
939 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
941 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
943 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
944 (status
->flag
& RX_FLAG_IV_STRIPPED
))
946 /* Skip decryption if the frame is not protected. */
947 if (!ieee80211_has_protected(fc
))
949 } else if (mmie_keyidx
>= 0) {
950 /* Broadcast/multicast robust management frame / BIP */
951 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
952 (status
->flag
& RX_FLAG_IV_STRIPPED
))
955 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
956 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
957 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
959 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
961 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
962 } else if (!ieee80211_has_protected(fc
)) {
964 * The frame was not protected, so skip decryption. However, we
965 * need to set rx->key if there is a key that could have been
966 * used so that the frame may be dropped if encryption would
967 * have been expected.
969 struct ieee80211_key
*key
= NULL
;
970 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
973 if (ieee80211_is_mgmt(fc
) &&
974 is_multicast_ether_addr(hdr
->addr1
) &&
975 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
979 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
980 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
986 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
987 key
= rcu_dereference(sdata
->keys
[i
]);
999 * The device doesn't give us the IV so we won't be
1000 * able to look up the key. That's ok though, we
1001 * don't need to decrypt the frame, we just won't
1002 * be able to keep statistics accurate.
1003 * Except for key threshold notifications, should
1004 * we somehow allow the driver to tell us which key
1005 * the hardware used if this flag is set?
1007 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1008 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1011 hdrlen
= ieee80211_hdrlen(fc
);
1013 if (rx
->skb
->len
< 8 + hdrlen
)
1014 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1017 * no need to call ieee80211_wep_get_keyidx,
1018 * it verifies a bunch of things we've done already
1020 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1021 keyidx
= keyid
>> 6;
1023 /* check per-station GTK first, if multicast packet */
1024 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1025 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1027 /* if not found, try default key */
1029 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1032 * RSNA-protected unicast frames should always be
1033 * sent with pairwise or station-to-station keys,
1034 * but for WEP we allow using a key index as well.
1037 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1038 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1039 !is_multicast_ether_addr(hdr
->addr1
))
1045 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1046 return RX_DROP_MONITOR
;
1048 rx
->key
->tx_rx_count
++;
1049 /* TODO: add threshold stuff again */
1051 return RX_DROP_MONITOR
;
1054 if (skb_linearize(rx
->skb
))
1055 return RX_DROP_UNUSABLE
;
1056 /* the hdr variable is invalid now! */
1058 switch (rx
->key
->conf
.cipher
) {
1059 case WLAN_CIPHER_SUITE_WEP40
:
1060 case WLAN_CIPHER_SUITE_WEP104
:
1061 /* Check for weak IVs if possible */
1062 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1063 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1064 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1065 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1066 rx
->sta
->wep_weak_iv_count
++;
1068 result
= ieee80211_crypto_wep_decrypt(rx
);
1070 case WLAN_CIPHER_SUITE_TKIP
:
1071 result
= ieee80211_crypto_tkip_decrypt(rx
);
1073 case WLAN_CIPHER_SUITE_CCMP
:
1074 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1076 case WLAN_CIPHER_SUITE_AES_CMAC
:
1077 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1081 * We can reach here only with HW-only algorithms
1082 * but why didn't it decrypt the frame?!
1084 return RX_DROP_UNUSABLE
;
1087 /* either the frame has been decrypted or will be dropped */
1088 status
->flag
|= RX_FLAG_DECRYPTED
;
1093 static ieee80211_rx_result debug_noinline
1094 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1096 struct ieee80211_local
*local
;
1097 struct ieee80211_hdr
*hdr
;
1098 struct sk_buff
*skb
;
1102 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1104 if (!local
->pspolling
)
1107 if (!ieee80211_has_fromds(hdr
->frame_control
))
1108 /* this is not from AP */
1111 if (!ieee80211_is_data(hdr
->frame_control
))
1114 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1115 /* AP has no more frames buffered for us */
1116 local
->pspolling
= false;
1120 /* more data bit is set, let's request a new frame from the AP */
1121 ieee80211_send_pspoll(local
, rx
->sdata
);
1126 static void ap_sta_ps_start(struct sta_info
*sta
)
1128 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1129 struct ieee80211_local
*local
= sdata
->local
;
1131 atomic_inc(&sdata
->bss
->num_sta_ps
);
1132 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1133 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1134 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1135 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1136 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1137 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1138 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1141 static void ap_sta_ps_end(struct sta_info
*sta
)
1143 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1145 atomic_dec(&sdata
->bss
->num_sta_ps
);
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1149 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1150 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1152 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1155 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1160 ieee80211_sta_ps_deliver_wakeup(sta
);
1163 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1165 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1168 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1170 /* Don't let the same PS state be set twice */
1171 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1172 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1176 ap_sta_ps_start(sta_inf
);
1178 ap_sta_ps_end(sta_inf
);
1182 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1184 static ieee80211_rx_result debug_noinline
1185 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1187 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1188 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1189 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1192 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1195 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1196 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1204 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1212 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1215 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1216 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1217 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1218 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1220 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx
->skb
);
1228 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1229 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1230 ieee80211_has_pm(hdr
->frame_control
) &&
1231 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1232 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1233 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1234 ac
= ieee802_1d_to_ac
[tid
& 7];
1237 * If this AC is not trigger-enabled do nothing.
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1243 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1246 /* if we are in a service period, do nothing */
1247 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1250 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1251 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1253 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1262 struct sta_info
*sta
= rx
->sta
;
1263 struct sk_buff
*skb
= rx
->skb
;
1264 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1265 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1275 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1276 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1277 NL80211_IFTYPE_ADHOC
);
1278 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1279 sta
->last_rx
= jiffies
;
1280 if (ieee80211_is_data(hdr
->frame_control
)) {
1281 sta
->last_rx_rate_idx
= status
->rate_idx
;
1282 sta
->last_rx_rate_flag
= status
->flag
;
1285 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
1290 sta
->last_rx
= jiffies
;
1291 if (ieee80211_is_data(hdr
->frame_control
)) {
1292 sta
->last_rx_rate_idx
= status
->rate_idx
;
1293 sta
->last_rx_rate_flag
= status
->flag
;
1297 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1300 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1301 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1303 sta
->rx_fragments
++;
1304 sta
->rx_bytes
+= rx
->skb
->len
;
1305 sta
->last_signal
= status
->signal
;
1306 ewma_add(&sta
->avg_signal
, -status
->signal
);
1309 * Change STA power saving mode only at the end of a frame
1310 * exchange sequence.
1312 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1313 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1314 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1315 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1316 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1317 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1319 * Ignore doze->wake transitions that are
1320 * indicated by non-data frames, the standard
1321 * is unclear here, but for example going to
1322 * PS mode and then scanning would cause a
1323 * doze->wake transition for the probe request,
1324 * and that is clearly undesirable.
1326 if (ieee80211_is_data(hdr
->frame_control
) &&
1327 !ieee80211_has_pm(hdr
->frame_control
))
1330 if (ieee80211_has_pm(hdr
->frame_control
))
1331 ap_sta_ps_start(sta
);
1336 * Drop (qos-)data::nullfunc frames silently, since they
1337 * are used only to control station power saving mode.
1339 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1340 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1341 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1344 * If we receive a 4-addr nullfunc frame from a STA
1345 * that was not moved to a 4-addr STA vlan yet, drop
1346 * the frame to the monitor interface, to make sure
1347 * that hostapd sees it
1349 if (ieee80211_has_a4(hdr
->frame_control
) &&
1350 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1351 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1352 !rx
->sdata
->u
.vlan
.sta
)))
1353 return RX_DROP_MONITOR
;
1355 * Update counter and free packet here to avoid
1356 * counting this as a dropped packed.
1359 dev_kfree_skb(rx
->skb
);
1364 } /* ieee80211_rx_h_sta_process */
1366 static inline struct ieee80211_fragment_entry
*
1367 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1368 unsigned int frag
, unsigned int seq
, int rx_queue
,
1369 struct sk_buff
**skb
)
1371 struct ieee80211_fragment_entry
*entry
;
1374 idx
= sdata
->fragment_next
;
1375 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1376 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1377 sdata
->fragment_next
= 0;
1379 if (!skb_queue_empty(&entry
->skb_list
)) {
1380 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1381 struct ieee80211_hdr
*hdr
=
1382 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1383 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1384 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1385 "addr1=%pM addr2=%pM\n",
1387 jiffies
- entry
->first_frag_time
, entry
->seq
,
1388 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1390 __skb_queue_purge(&entry
->skb_list
);
1393 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1395 entry
->first_frag_time
= jiffies
;
1397 entry
->rx_queue
= rx_queue
;
1398 entry
->last_frag
= frag
;
1400 entry
->extra_len
= 0;
1405 static inline struct ieee80211_fragment_entry
*
1406 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1407 unsigned int frag
, unsigned int seq
,
1408 int rx_queue
, struct ieee80211_hdr
*hdr
)
1410 struct ieee80211_fragment_entry
*entry
;
1413 idx
= sdata
->fragment_next
;
1414 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1415 struct ieee80211_hdr
*f_hdr
;
1419 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1421 entry
= &sdata
->fragments
[idx
];
1422 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1423 entry
->rx_queue
!= rx_queue
||
1424 entry
->last_frag
+ 1 != frag
)
1427 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1430 * Check ftype and addresses are equal, else check next fragment
1432 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1433 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1434 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1435 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1438 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1439 __skb_queue_purge(&entry
->skb_list
);
1448 static ieee80211_rx_result debug_noinline
1449 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1451 struct ieee80211_hdr
*hdr
;
1454 unsigned int frag
, seq
;
1455 struct ieee80211_fragment_entry
*entry
;
1456 struct sk_buff
*skb
;
1457 struct ieee80211_rx_status
*status
;
1459 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1460 fc
= hdr
->frame_control
;
1461 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1462 frag
= sc
& IEEE80211_SCTL_FRAG
;
1464 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1465 (rx
->skb
)->len
< 24 ||
1466 is_multicast_ether_addr(hdr
->addr1
))) {
1467 /* not fragmented */
1470 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1472 if (skb_linearize(rx
->skb
))
1473 return RX_DROP_UNUSABLE
;
1476 * skb_linearize() might change the skb->data and
1477 * previously cached variables (in this case, hdr) need to
1478 * be refreshed with the new data.
1480 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1481 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1484 /* This is the first fragment of a new frame. */
1485 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1486 rx
->seqno_idx
, &(rx
->skb
));
1487 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1488 ieee80211_has_protected(fc
)) {
1489 int queue
= rx
->security_idx
;
1490 /* Store CCMP PN so that we can verify that the next
1491 * fragment has a sequential PN value. */
1493 memcpy(entry
->last_pn
,
1494 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1500 /* This is a fragment for a frame that should already be pending in
1501 * fragment cache. Add this fragment to the end of the pending entry.
1503 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1504 rx
->seqno_idx
, hdr
);
1506 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1507 return RX_DROP_MONITOR
;
1510 /* Verify that MPDUs within one MSDU have sequential PN values.
1511 * (IEEE 802.11i, 8.3.3.4.5) */
1514 u8 pn
[CCMP_PN_LEN
], *rpn
;
1516 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1517 return RX_DROP_UNUSABLE
;
1518 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1519 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1524 queue
= rx
->security_idx
;
1525 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1526 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1527 return RX_DROP_UNUSABLE
;
1528 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1531 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1532 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1533 entry
->last_frag
= frag
;
1534 entry
->extra_len
+= rx
->skb
->len
;
1535 if (ieee80211_has_morefrags(fc
)) {
1540 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1541 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1542 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1543 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1545 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1546 __skb_queue_purge(&entry
->skb_list
);
1547 return RX_DROP_UNUSABLE
;
1550 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1551 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1555 /* Complete frame has been reassembled - process it now */
1556 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1557 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1561 rx
->sta
->rx_packets
++;
1562 if (is_multicast_ether_addr(hdr
->addr1
))
1563 rx
->local
->dot11MulticastReceivedFrameCount
++;
1565 ieee80211_led_rx(rx
->local
);
1569 static ieee80211_rx_result debug_noinline
1570 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1572 u8
*data
= rx
->skb
->data
;
1573 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1575 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1578 /* remove the qos control field, update frame type and meta-data */
1579 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1580 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1581 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1582 /* change frame type to non QOS */
1583 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1589 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1591 if (unlikely(!rx
->sta
||
1592 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1599 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1601 struct sk_buff
*skb
= rx
->skb
;
1602 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1605 * Pass through unencrypted frames if the hardware has
1606 * decrypted them already.
1608 if (status
->flag
& RX_FLAG_DECRYPTED
)
1611 /* Drop unencrypted frames if key is set. */
1612 if (unlikely(!ieee80211_has_protected(fc
) &&
1613 !ieee80211_is_nullfunc(fc
) &&
1614 ieee80211_is_data(fc
) &&
1615 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1622 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1624 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1625 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1626 __le16 fc
= hdr
->frame_control
;
1629 * Pass through unencrypted frames if the hardware has
1630 * decrypted them already.
1632 if (status
->flag
& RX_FLAG_DECRYPTED
)
1635 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1636 if (unlikely(!ieee80211_has_protected(fc
) &&
1637 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1639 if (ieee80211_is_deauth(fc
))
1640 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1643 else if (ieee80211_is_disassoc(fc
))
1644 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1649 /* BIP does not use Protected field, so need to check MMIE */
1650 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1651 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1652 if (ieee80211_is_deauth(fc
))
1653 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1656 else if (ieee80211_is_disassoc(fc
))
1657 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1663 * When using MFP, Action frames are not allowed prior to
1664 * having configured keys.
1666 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1667 ieee80211_is_robust_mgmt_frame(
1668 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1676 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1678 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1679 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1680 bool check_port_control
= false;
1681 struct ethhdr
*ehdr
;
1684 *port_control
= false;
1685 if (ieee80211_has_a4(hdr
->frame_control
) &&
1686 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1689 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1690 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1692 if (!sdata
->u
.mgd
.use_4addr
)
1695 check_port_control
= true;
1698 if (is_multicast_ether_addr(hdr
->addr1
) &&
1699 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1702 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1706 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1707 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1708 *port_control
= true;
1709 else if (check_port_control
)
1716 * requires that rx->skb is a frame with ethernet header
1718 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1720 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1721 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1722 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1725 * Allow EAPOL frames to us/the PAE group address regardless
1726 * of whether the frame was encrypted or not.
1728 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1729 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1730 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1733 if (ieee80211_802_1x_port_control(rx
) ||
1734 ieee80211_drop_unencrypted(rx
, fc
))
1741 * requires that rx->skb is a frame with ethernet header
1744 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1746 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1747 struct net_device
*dev
= sdata
->dev
;
1748 struct sk_buff
*skb
, *xmit_skb
;
1749 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1750 struct sta_info
*dsta
;
1751 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1756 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1757 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1758 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1759 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1760 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1761 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1763 * send multicast frames both to higher layers in
1764 * local net stack and back to the wireless medium
1766 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1767 if (!xmit_skb
&& net_ratelimit())
1768 printk(KERN_DEBUG
"%s: failed to clone "
1769 "multicast frame\n", dev
->name
);
1771 dsta
= sta_info_get(sdata
, skb
->data
);
1774 * The destination station is associated to
1775 * this AP (in this VLAN), so send the frame
1776 * directly to it and do not pass it to local
1786 int align __maybe_unused
;
1788 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1790 * 'align' will only take the values 0 or 2 here
1791 * since all frames are required to be aligned
1792 * to 2-byte boundaries when being passed to
1793 * mac80211. That also explains the __skb_push()
1796 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1798 if (WARN_ON(skb_headroom(skb
) < 3)) {
1802 u8
*data
= skb
->data
;
1803 size_t len
= skb_headlen(skb
);
1805 memmove(skb
->data
, data
, len
);
1806 skb_set_tail_pointer(skb
, len
);
1812 /* deliver to local stack */
1813 skb
->protocol
= eth_type_trans(skb
, dev
);
1814 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1815 netif_receive_skb(skb
);
1820 /* send to wireless media */
1821 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1822 skb_reset_network_header(xmit_skb
);
1823 skb_reset_mac_header(xmit_skb
);
1824 dev_queue_xmit(xmit_skb
);
1828 static ieee80211_rx_result debug_noinline
1829 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1831 struct net_device
*dev
= rx
->sdata
->dev
;
1832 struct sk_buff
*skb
= rx
->skb
;
1833 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1834 __le16 fc
= hdr
->frame_control
;
1835 struct sk_buff_head frame_list
;
1836 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1838 if (unlikely(!ieee80211_is_data(fc
)))
1841 if (unlikely(!ieee80211_is_data_present(fc
)))
1842 return RX_DROP_MONITOR
;
1844 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1847 if (ieee80211_has_a4(hdr
->frame_control
) &&
1848 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1849 !rx
->sdata
->u
.vlan
.sta
)
1850 return RX_DROP_UNUSABLE
;
1852 if (is_multicast_ether_addr(hdr
->addr1
) &&
1853 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1854 rx
->sdata
->u
.vlan
.sta
) ||
1855 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1856 rx
->sdata
->u
.mgd
.use_4addr
)))
1857 return RX_DROP_UNUSABLE
;
1860 __skb_queue_head_init(&frame_list
);
1862 if (skb_linearize(skb
))
1863 return RX_DROP_UNUSABLE
;
1865 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1866 rx
->sdata
->vif
.type
,
1867 rx
->local
->hw
.extra_tx_headroom
, true);
1869 while (!skb_queue_empty(&frame_list
)) {
1870 rx
->skb
= __skb_dequeue(&frame_list
);
1872 if (!ieee80211_frame_allowed(rx
, fc
)) {
1873 dev_kfree_skb(rx
->skb
);
1876 dev
->stats
.rx_packets
++;
1877 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1879 ieee80211_deliver_skb(rx
);
1885 #ifdef CONFIG_MAC80211_MESH
1886 static ieee80211_rx_result
1887 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1889 struct ieee80211_hdr
*hdr
;
1890 struct ieee80211s_hdr
*mesh_hdr
;
1891 unsigned int hdrlen
;
1892 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1893 struct ieee80211_local
*local
= rx
->local
;
1894 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1895 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1897 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1898 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1899 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1901 /* frame is in RMC, don't forward */
1902 if (ieee80211_is_data(hdr
->frame_control
) &&
1903 is_multicast_ether_addr(hdr
->addr1
) &&
1904 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1905 return RX_DROP_MONITOR
;
1907 if (!ieee80211_is_data(hdr
->frame_control
))
1912 return RX_DROP_MONITOR
;
1914 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1915 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1916 dropped_frames_congestion
);
1917 return RX_DROP_MONITOR
;
1920 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1921 struct mesh_path
*mppath
;
1925 if (is_multicast_ether_addr(hdr
->addr1
)) {
1926 mpp_addr
= hdr
->addr3
;
1927 proxied_addr
= mesh_hdr
->eaddr1
;
1929 mpp_addr
= hdr
->addr4
;
1930 proxied_addr
= mesh_hdr
->eaddr2
;
1934 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1936 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1938 spin_lock_bh(&mppath
->state_lock
);
1939 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1940 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1941 spin_unlock_bh(&mppath
->state_lock
);
1946 /* Frame has reached destination. Don't forward */
1947 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1948 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1951 skb_set_queue_mapping(skb
, ieee80211_select_queue(sdata
, skb
));
1954 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1956 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1957 dropped_frames_ttl
);
1959 struct ieee80211_hdr
*fwd_hdr
;
1960 struct ieee80211_tx_info
*info
;
1962 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1964 if (!fwd_skb
&& net_ratelimit())
1965 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1970 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1971 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1972 info
= IEEE80211_SKB_CB(fwd_skb
);
1973 memset(info
, 0, sizeof(*info
));
1974 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1975 info
->control
.vif
= &rx
->sdata
->vif
;
1976 info
->control
.jiffies
= jiffies
;
1977 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1978 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1983 * Save TA to addr1 to send TA a path error if a
1984 * suitable next hop is not found
1986 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1988 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1989 /* Failed to immediately resolve next hop:
1990 * fwded frame was dropped or will be added
1991 * later to the pending skb queue. */
1993 return RX_DROP_MONITOR
;
1995 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1998 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
2000 ieee80211_add_pending_skb(local
, fwd_skb
);
2005 if (is_multicast_ether_addr(hdr
->addr1
) ||
2006 sdata
->dev
->flags
& IFF_PROMISC
)
2009 return RX_DROP_MONITOR
;
2013 static ieee80211_rx_result debug_noinline
2014 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2016 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2017 struct ieee80211_local
*local
= rx
->local
;
2018 struct net_device
*dev
= sdata
->dev
;
2019 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2020 __le16 fc
= hdr
->frame_control
;
2024 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2027 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2028 return RX_DROP_MONITOR
;
2031 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2032 * that a 4-addr station can be detected and moved into a separate VLAN
2034 if (ieee80211_has_a4(hdr
->frame_control
) &&
2035 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2036 return RX_DROP_MONITOR
;
2038 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2040 return RX_DROP_UNUSABLE
;
2042 if (!ieee80211_frame_allowed(rx
, fc
))
2043 return RX_DROP_MONITOR
;
2045 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2046 unlikely(port_control
) && sdata
->bss
) {
2047 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2055 dev
->stats
.rx_packets
++;
2056 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2058 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2059 !is_multicast_ether_addr(
2060 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2061 (!local
->scanning
&&
2062 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2063 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2064 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2067 ieee80211_deliver_skb(rx
);
2072 static ieee80211_rx_result debug_noinline
2073 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2075 struct ieee80211_local
*local
= rx
->local
;
2076 struct ieee80211_hw
*hw
= &local
->hw
;
2077 struct sk_buff
*skb
= rx
->skb
;
2078 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2079 struct tid_ampdu_rx
*tid_agg_rx
;
2083 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2086 if (ieee80211_is_back_req(bar
->frame_control
)) {
2088 __le16 control
, start_seq_num
;
2089 } __packed bar_data
;
2092 return RX_DROP_MONITOR
;
2094 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2095 &bar_data
, sizeof(bar_data
)))
2096 return RX_DROP_MONITOR
;
2098 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2100 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2102 return RX_DROP_MONITOR
;
2104 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2106 /* reset session timer */
2107 if (tid_agg_rx
->timeout
)
2108 mod_timer(&tid_agg_rx
->session_timer
,
2109 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2111 spin_lock(&tid_agg_rx
->reorder_lock
);
2112 /* release stored frames up to start of BAR */
2113 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2114 spin_unlock(&tid_agg_rx
->reorder_lock
);
2121 * After this point, we only want management frames,
2122 * so we can drop all remaining control frames to
2123 * cooked monitor interfaces.
2125 return RX_DROP_MONITOR
;
2128 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2129 struct ieee80211_mgmt
*mgmt
,
2132 struct ieee80211_local
*local
= sdata
->local
;
2133 struct sk_buff
*skb
;
2134 struct ieee80211_mgmt
*resp
;
2136 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2137 /* Not to own unicast address */
2141 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2142 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2143 /* Not from the current AP or not associated yet. */
2147 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2148 /* Too short SA Query request frame */
2152 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2156 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2157 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2158 memset(resp
, 0, 24);
2159 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2160 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2161 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2162 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2163 IEEE80211_STYPE_ACTION
);
2164 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2165 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2166 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2167 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2168 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2169 WLAN_SA_QUERY_TR_ID_LEN
);
2171 ieee80211_tx_skb(sdata
, skb
);
2174 static ieee80211_rx_result debug_noinline
2175 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2177 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2178 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2181 * From here on, look only at management frames.
2182 * Data and control frames are already handled,
2183 * and unknown (reserved) frames are useless.
2185 if (rx
->skb
->len
< 24)
2186 return RX_DROP_MONITOR
;
2188 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2189 return RX_DROP_MONITOR
;
2191 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2192 return RX_DROP_MONITOR
;
2194 if (ieee80211_drop_unencrypted_mgmt(rx
))
2195 return RX_DROP_UNUSABLE
;
2200 static ieee80211_rx_result debug_noinline
2201 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2203 struct ieee80211_local
*local
= rx
->local
;
2204 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2205 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2206 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2207 int len
= rx
->skb
->len
;
2209 if (!ieee80211_is_action(mgmt
->frame_control
))
2212 /* drop too small frames */
2213 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2214 return RX_DROP_UNUSABLE
;
2216 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2217 return RX_DROP_UNUSABLE
;
2219 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2220 return RX_DROP_UNUSABLE
;
2222 switch (mgmt
->u
.action
.category
) {
2223 case WLAN_CATEGORY_BACK
:
2224 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2225 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2226 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2227 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2230 /* verify action_code is present */
2231 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2234 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2235 case WLAN_ACTION_ADDBA_REQ
:
2236 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2237 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2240 case WLAN_ACTION_ADDBA_RESP
:
2241 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2242 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2245 case WLAN_ACTION_DELBA
:
2246 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2247 sizeof(mgmt
->u
.action
.u
.delba
)))
2255 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2256 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2259 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2262 /* verify action_code is present */
2263 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2266 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2267 case WLAN_ACTION_SPCT_MSR_REQ
:
2268 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2269 sizeof(mgmt
->u
.action
.u
.measurement
)))
2271 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2273 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2274 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2275 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2278 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2281 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2287 case WLAN_CATEGORY_SA_QUERY
:
2288 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2289 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2292 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2293 case WLAN_ACTION_SA_QUERY_REQUEST
:
2294 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2296 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2300 case WLAN_CATEGORY_SELF_PROTECTED
:
2301 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2302 case WLAN_SP_MESH_PEERING_OPEN
:
2303 case WLAN_SP_MESH_PEERING_CLOSE
:
2304 case WLAN_SP_MESH_PEERING_CONFIRM
:
2305 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2307 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2308 /* userspace handles this frame */
2311 case WLAN_SP_MGK_INFORM
:
2312 case WLAN_SP_MGK_ACK
:
2313 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2318 case WLAN_CATEGORY_MESH_ACTION
:
2319 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2321 if (mesh_action_is_path_sel(mgmt
) &&
2322 (!mesh_path_sel_is_hwmp(sdata
)))
2330 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2331 /* will return in the next handlers */
2336 rx
->sta
->rx_packets
++;
2337 dev_kfree_skb(rx
->skb
);
2341 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2342 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2343 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2345 rx
->sta
->rx_packets
++;
2349 static ieee80211_rx_result debug_noinline
2350 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2352 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2354 /* skip known-bad action frames and return them in the next handler */
2355 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2359 * Getting here means the kernel doesn't know how to handle
2360 * it, but maybe userspace does ... include returned frames
2361 * so userspace can register for those to know whether ones
2362 * it transmitted were processed or returned.
2365 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2366 rx
->skb
->data
, rx
->skb
->len
,
2369 rx
->sta
->rx_packets
++;
2370 dev_kfree_skb(rx
->skb
);
2378 static ieee80211_rx_result debug_noinline
2379 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2381 struct ieee80211_local
*local
= rx
->local
;
2382 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2383 struct sk_buff
*nskb
;
2384 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2385 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2387 if (!ieee80211_is_action(mgmt
->frame_control
))
2391 * For AP mode, hostapd is responsible for handling any action
2392 * frames that we didn't handle, including returning unknown
2393 * ones. For all other modes we will return them to the sender,
2394 * setting the 0x80 bit in the action category, as required by
2395 * 802.11-2007 7.3.1.11.
2396 * Newer versions of hostapd shall also use the management frame
2397 * registration mechanisms, but older ones still use cooked
2398 * monitor interfaces so push all frames there.
2400 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2401 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2402 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2403 return RX_DROP_MONITOR
;
2405 /* do not return rejected action frames */
2406 if (mgmt
->u
.action
.category
& 0x80)
2407 return RX_DROP_UNUSABLE
;
2409 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2412 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2414 nmgmt
->u
.action
.category
|= 0x80;
2415 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2416 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2418 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2420 ieee80211_tx_skb(rx
->sdata
, nskb
);
2422 dev_kfree_skb(rx
->skb
);
2426 static ieee80211_rx_result debug_noinline
2427 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2429 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2430 ieee80211_rx_result rxs
;
2431 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2434 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2435 if (rxs
!= RX_CONTINUE
)
2438 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2440 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2441 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2442 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2443 return RX_DROP_MONITOR
;
2446 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2447 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2448 /* process for all: mesh, mlme, ibss */
2450 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2451 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2452 if (is_multicast_ether_addr(mgmt
->da
) &&
2453 !is_broadcast_ether_addr(mgmt
->da
))
2454 return RX_DROP_MONITOR
;
2456 /* process only for station */
2457 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2458 return RX_DROP_MONITOR
;
2460 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2461 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2462 /* process only for ibss */
2463 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2464 return RX_DROP_MONITOR
;
2467 return RX_DROP_MONITOR
;
2470 /* queue up frame and kick off work to process it */
2471 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2472 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2473 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2475 rx
->sta
->rx_packets
++;
2480 /* TODO: use IEEE80211_RX_FRAGMENTED */
2481 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2482 struct ieee80211_rate
*rate
)
2484 struct ieee80211_sub_if_data
*sdata
;
2485 struct ieee80211_local
*local
= rx
->local
;
2486 struct ieee80211_rtap_hdr
{
2487 struct ieee80211_radiotap_header hdr
;
2493 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2494 struct net_device
*prev_dev
= NULL
;
2495 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2498 * If cooked monitor has been processed already, then
2499 * don't do it again. If not, set the flag.
2501 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2503 rx
->flags
|= IEEE80211_RX_CMNTR
;
2505 /* If there are no cooked monitor interfaces, just free the SKB */
2506 if (!local
->cooked_mntrs
)
2509 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2510 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2513 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2514 memset(rthdr
, 0, sizeof(*rthdr
));
2515 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2516 rthdr
->hdr
.it_present
=
2517 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2518 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2521 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2522 rthdr
->hdr
.it_present
|=
2523 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2525 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2527 if (status
->band
== IEEE80211_BAND_5GHZ
)
2528 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2529 IEEE80211_CHAN_5GHZ
);
2531 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2532 IEEE80211_CHAN_2GHZ
);
2534 skb_set_mac_header(skb
, 0);
2535 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2536 skb
->pkt_type
= PACKET_OTHERHOST
;
2537 skb
->protocol
= htons(ETH_P_802_2
);
2539 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2540 if (!ieee80211_sdata_running(sdata
))
2543 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2544 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2548 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2550 skb2
->dev
= prev_dev
;
2551 netif_receive_skb(skb2
);
2555 prev_dev
= sdata
->dev
;
2556 sdata
->dev
->stats
.rx_packets
++;
2557 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2561 skb
->dev
= prev_dev
;
2562 netif_receive_skb(skb
);
2570 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2571 ieee80211_rx_result res
)
2574 case RX_DROP_MONITOR
:
2575 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2577 rx
->sta
->rx_dropped
++;
2580 struct ieee80211_rate
*rate
= NULL
;
2581 struct ieee80211_supported_band
*sband
;
2582 struct ieee80211_rx_status
*status
;
2584 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2586 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2587 if (!(status
->flag
& RX_FLAG_HT
))
2588 rate
= &sband
->bitrates
[status
->rate_idx
];
2590 ieee80211_rx_cooked_monitor(rx
, rate
);
2593 case RX_DROP_UNUSABLE
:
2594 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2596 rx
->sta
->rx_dropped
++;
2597 dev_kfree_skb(rx
->skb
);
2600 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2605 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2607 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2608 struct sk_buff
*skb
;
2610 #define CALL_RXH(rxh) \
2613 if (res != RX_CONTINUE) \
2617 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2618 if (rx
->local
->running_rx_handler
)
2621 rx
->local
->running_rx_handler
= true;
2623 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2624 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2627 * all the other fields are valid across frames
2628 * that belong to an aMPDU since they are on the
2629 * same TID from the same station
2633 CALL_RXH(ieee80211_rx_h_decrypt
)
2634 CALL_RXH(ieee80211_rx_h_check_more_data
)
2635 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2636 CALL_RXH(ieee80211_rx_h_sta_process
)
2637 CALL_RXH(ieee80211_rx_h_defragment
)
2638 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2639 /* must be after MMIC verify so header is counted in MPDU mic */
2640 #ifdef CONFIG_MAC80211_MESH
2641 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2642 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2644 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2645 CALL_RXH(ieee80211_rx_h_amsdu
)
2646 CALL_RXH(ieee80211_rx_h_data
)
2647 CALL_RXH(ieee80211_rx_h_ctrl
);
2648 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2649 CALL_RXH(ieee80211_rx_h_action
)
2650 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2651 CALL_RXH(ieee80211_rx_h_action_return
)
2652 CALL_RXH(ieee80211_rx_h_mgmt
)
2655 ieee80211_rx_handlers_result(rx
, res
);
2656 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2660 rx
->local
->running_rx_handler
= false;
2663 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2666 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2668 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2670 #define CALL_RXH(rxh) \
2673 if (res != RX_CONTINUE) \
2677 CALL_RXH(ieee80211_rx_h_passive_scan
)
2678 CALL_RXH(ieee80211_rx_h_check
)
2680 ieee80211_rx_reorder_ampdu(rx
);
2682 ieee80211_rx_handlers(rx
);
2686 ieee80211_rx_handlers_result(rx
, res
);
2692 * This function makes calls into the RX path, therefore
2693 * it has to be invoked under RCU read lock.
2695 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2697 struct ieee80211_rx_data rx
= {
2699 .sdata
= sta
->sdata
,
2700 .local
= sta
->local
,
2701 /* This is OK -- must be QoS data frame */
2702 .security_idx
= tid
,
2706 struct tid_ampdu_rx
*tid_agg_rx
;
2708 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2712 spin_lock(&tid_agg_rx
->reorder_lock
);
2713 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2714 spin_unlock(&tid_agg_rx
->reorder_lock
);
2716 ieee80211_rx_handlers(&rx
);
2719 /* main receive path */
2721 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2722 struct ieee80211_hdr
*hdr
)
2724 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2725 struct sk_buff
*skb
= rx
->skb
;
2726 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2727 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2728 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2730 switch (sdata
->vif
.type
) {
2731 case NL80211_IFTYPE_STATION
:
2732 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2735 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2736 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2737 sdata
->u
.mgd
.use_4addr
)
2739 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2742 case NL80211_IFTYPE_ADHOC
:
2745 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2748 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2749 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2751 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2752 } else if (!multicast
&&
2753 compare_ether_addr(sdata
->vif
.addr
,
2755 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2757 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2758 } else if (!rx
->sta
) {
2760 if (status
->flag
& RX_FLAG_HT
)
2761 rate_idx
= 0; /* TODO: HT rates */
2763 rate_idx
= status
->rate_idx
;
2764 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2765 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2768 case NL80211_IFTYPE_MESH_POINT
:
2770 compare_ether_addr(sdata
->vif
.addr
,
2772 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2775 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2778 case NL80211_IFTYPE_AP_VLAN
:
2779 case NL80211_IFTYPE_AP
:
2781 if (compare_ether_addr(sdata
->vif
.addr
,
2784 } else if (!ieee80211_bssid_match(bssid
,
2786 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2787 !ieee80211_is_beacon(hdr
->frame_control
) &&
2788 !(ieee80211_is_action(hdr
->frame_control
) &&
2791 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2794 case NL80211_IFTYPE_WDS
:
2795 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2797 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2801 /* should never get here */
2810 * This function returns whether or not the SKB
2811 * was destined for RX processing or not, which,
2812 * if consume is true, is equivalent to whether
2813 * or not the skb was consumed.
2815 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2816 struct sk_buff
*skb
, bool consume
)
2818 struct ieee80211_local
*local
= rx
->local
;
2819 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2820 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2821 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2825 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2826 prepares
= prepare_for_handlers(rx
, hdr
);
2832 skb
= skb_copy(skb
, GFP_ATOMIC
);
2834 if (net_ratelimit())
2835 wiphy_debug(local
->hw
.wiphy
,
2836 "failed to copy skb for %s\n",
2844 ieee80211_invoke_rx_handlers(rx
);
2849 * This is the actual Rx frames handler. as it blongs to Rx path it must
2850 * be called with rcu_read_lock protection.
2852 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2853 struct sk_buff
*skb
)
2855 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2856 struct ieee80211_local
*local
= hw_to_local(hw
);
2857 struct ieee80211_sub_if_data
*sdata
;
2858 struct ieee80211_hdr
*hdr
;
2860 struct ieee80211_rx_data rx
;
2861 struct ieee80211_sub_if_data
*prev
;
2862 struct sta_info
*sta
, *tmp
, *prev_sta
;
2865 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2866 memset(&rx
, 0, sizeof(rx
));
2870 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2871 local
->dot11ReceivedFragmentCount
++;
2873 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2874 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2875 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2877 if (ieee80211_is_mgmt(fc
))
2878 err
= skb_linearize(skb
);
2880 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2887 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2888 ieee80211_parse_qos(&rx
);
2889 ieee80211_verify_alignment(&rx
);
2891 if (ieee80211_is_data(fc
)) {
2894 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2901 rx
.sdata
= prev_sta
->sdata
;
2902 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2909 rx
.sdata
= prev_sta
->sdata
;
2911 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2919 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2920 if (!ieee80211_sdata_running(sdata
))
2923 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2924 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2928 * frame is destined for this interface, but if it's
2929 * not also for the previous one we handle that after
2930 * the loop to avoid copying the SKB once too much
2938 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2940 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2946 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2949 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2958 * This is the receive path handler. It is called by a low level driver when an
2959 * 802.11 MPDU is received from the hardware.
2961 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2963 struct ieee80211_local
*local
= hw_to_local(hw
);
2964 struct ieee80211_rate
*rate
= NULL
;
2965 struct ieee80211_supported_band
*sband
;
2966 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2968 WARN_ON_ONCE(softirq_count() == 0);
2970 if (WARN_ON(status
->band
< 0 ||
2971 status
->band
>= IEEE80211_NUM_BANDS
))
2974 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2975 if (WARN_ON(!sband
))
2979 * If we're suspending, it is possible although not too likely
2980 * that we'd be receiving frames after having already partially
2981 * quiesced the stack. We can't process such frames then since
2982 * that might, for example, cause stations to be added or other
2983 * driver callbacks be invoked.
2985 if (unlikely(local
->quiescing
|| local
->suspended
))
2989 * The same happens when we're not even started,
2990 * but that's worth a warning.
2992 if (WARN_ON(!local
->started
))
2995 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2997 * Validate the rate, unless a PLCP error means that
2998 * we probably can't have a valid rate here anyway.
3001 if (status
->flag
& RX_FLAG_HT
) {
3003 * rate_idx is MCS index, which can be [0-76]
3006 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3008 * Anything else would be some sort of driver or
3009 * hardware error. The driver should catch hardware
3012 if (WARN((status
->rate_idx
< 0 ||
3013 status
->rate_idx
> 76),
3014 "Rate marked as an HT rate but passed "
3015 "status->rate_idx is not "
3016 "an MCS index [0-76]: %d (0x%02x)\n",
3021 if (WARN_ON(status
->rate_idx
< 0 ||
3022 status
->rate_idx
>= sband
->n_bitrates
))
3024 rate
= &sband
->bitrates
[status
->rate_idx
];
3028 status
->rx_flags
= 0;
3031 * key references and virtual interfaces are protected using RCU
3032 * and this requires that we are in a read-side RCU section during
3033 * receive processing
3038 * Frames with failed FCS/PLCP checksum are not returned,
3039 * all other frames are returned without radiotap header
3040 * if it was previously present.
3041 * Also, frames with less than 16 bytes are dropped.
3043 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3049 ieee80211_tpt_led_trig_rx(local
,
3050 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3052 __ieee80211_rx_handle_packet(hw
, skb
);
3060 EXPORT_SYMBOL(ieee80211_rx
);
3062 /* This is a version of the rx handler that can be called from hard irq
3063 * context. Post the skb on the queue and schedule the tasklet */
3064 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3066 struct ieee80211_local
*local
= hw_to_local(hw
);
3068 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3070 skb
->pkt_type
= IEEE80211_RX_MSG
;
3071 skb_queue_tail(&local
->skb_queue
, skb
);
3072 tasklet_schedule(&local
->tasklet
);
3074 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);