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
);
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_CONTROL_A_MSDU_PRESENT
)
342 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
345 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
347 * Sequence numbers for management frames, QoS data
348 * frames with a broadcast/multicast address in the
349 * Address 1 field, and all non-QoS data frames sent
350 * by QoS STAs are assigned using an additional single
351 * modulo-4096 counter, [...]
353 * We also use that counter for non-QoS STAs.
355 tid
= NUM_RX_DATA_QUEUES
- 1;
359 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
360 * For now, set skb->priority to 0 for other cases. */
361 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
365 * DOC: Packet alignment
367 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * Additionally, should, if possible, align the payload data in a way that
371 * guarantees that the contained IP header is aligned to a four-byte
372 * boundary. In the case of regular frames, this simply means aligning the
373 * payload to a four-byte boundary (because either the IP header is directly
374 * contained, or IV/RFC1042 headers that have a length divisible by four are
375 * in front of it). If the payload data is not properly aligned and the
376 * architecture doesn't support efficient unaligned operations, mac80211
377 * will align the data.
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
389 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
391 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
392 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
393 "unaligned packet at 0x%p\n", rx
->skb
->data
);
400 static ieee80211_rx_result debug_noinline
401 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
403 struct ieee80211_local
*local
= rx
->local
;
404 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
405 struct sk_buff
*skb
= rx
->skb
;
407 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
)))
410 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
411 test_bit(SCAN_SW_SCANNING
, &local
->scanning
))
412 return ieee80211_scan_rx(rx
->sdata
, skb
);
414 /* scanning finished during invoking of handlers */
415 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
416 return RX_DROP_UNUSABLE
;
420 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
422 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
424 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
427 return ieee80211_is_robust_mgmt_frame(hdr
);
431 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
433 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
435 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
438 return ieee80211_is_robust_mgmt_frame(hdr
);
442 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
443 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
445 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
446 struct ieee80211_mmie
*mmie
;
448 if (skb
->len
< 24 + sizeof(*mmie
) ||
449 !is_multicast_ether_addr(hdr
->da
))
452 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
453 return -1; /* not a robust management frame */
455 mmie
= (struct ieee80211_mmie
*)
456 (skb
->data
+ skb
->len
- sizeof(*mmie
));
457 if (mmie
->element_id
!= WLAN_EID_MMIE
||
458 mmie
->length
!= sizeof(*mmie
) - 2)
461 return le16_to_cpu(mmie
->key_id
);
465 static ieee80211_rx_result
466 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
468 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
469 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
470 char *dev_addr
= rx
->sdata
->vif
.addr
;
472 if (ieee80211_is_data(hdr
->frame_control
)) {
473 if (is_multicast_ether_addr(hdr
->addr1
)) {
474 if (ieee80211_has_tods(hdr
->frame_control
) ||
475 !ieee80211_has_fromds(hdr
->frame_control
))
476 return RX_DROP_MONITOR
;
477 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
478 return RX_DROP_MONITOR
;
480 if (!ieee80211_has_a4(hdr
->frame_control
))
481 return RX_DROP_MONITOR
;
482 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
483 return RX_DROP_MONITOR
;
487 /* If there is not an established peer link and this is not a peer link
488 * establisment frame, beacon or probe, drop the frame.
491 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
492 struct ieee80211_mgmt
*mgmt
;
494 if (!ieee80211_is_mgmt(hdr
->frame_control
))
495 return RX_DROP_MONITOR
;
497 if (ieee80211_is_action(hdr
->frame_control
)) {
498 mgmt
= (struct ieee80211_mgmt
*)hdr
;
499 if (mgmt
->u
.action
.category
!= WLAN_CATEGORY_MESH_PLINK
)
500 return RX_DROP_MONITOR
;
504 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
505 ieee80211_is_probe_resp(hdr
->frame_control
) ||
506 ieee80211_is_beacon(hdr
->frame_control
) ||
507 ieee80211_is_auth(hdr
->frame_control
))
510 return RX_DROP_MONITOR
;
514 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
516 if (ieee80211_is_data(hdr
->frame_control
) &&
517 is_multicast_ether_addr(hdr
->addr1
) &&
518 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
519 return RX_DROP_MONITOR
;
525 #define SEQ_MODULO 0x1000
526 #define SEQ_MASK 0xfff
528 static inline int seq_less(u16 sq1
, u16 sq2
)
530 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
533 static inline u16
seq_inc(u16 sq
)
535 return (sq
+ 1) & SEQ_MASK
;
538 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
540 return (sq1
- sq2
) & SEQ_MASK
;
544 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
545 struct tid_ampdu_rx
*tid_agg_rx
,
548 struct ieee80211_local
*local
= hw_to_local(hw
);
549 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
550 struct ieee80211_rx_status
*status
;
552 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
557 /* release the frame from the reorder ring buffer */
558 tid_agg_rx
->stored_mpdu_num
--;
559 tid_agg_rx
->reorder_buf
[index
] = NULL
;
560 status
= IEEE80211_SKB_RXCB(skb
);
561 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
562 skb_queue_tail(&local
->rx_skb_queue
, skb
);
565 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
568 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
569 struct tid_ampdu_rx
*tid_agg_rx
,
574 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
576 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
577 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
578 tid_agg_rx
->buf_size
;
579 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
584 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
585 * the skb was added to the buffer longer than this time ago, the earlier
586 * frames that have not yet been received are assumed to be lost and the skb
587 * can be released for processing. This may also release other skb's from the
588 * reorder buffer if there are no additional gaps between the frames.
590 * Callers must hold tid_agg_rx->reorder_lock.
592 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
594 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
595 struct tid_ampdu_rx
*tid_agg_rx
)
599 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
601 /* release the buffer until next missing frame */
602 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
603 tid_agg_rx
->buf_size
;
604 if (!tid_agg_rx
->reorder_buf
[index
] &&
605 tid_agg_rx
->stored_mpdu_num
> 1) {
607 * No buffers ready to be released, but check whether any
608 * frames in the reorder buffer have timed out.
611 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
612 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
613 if (!tid_agg_rx
->reorder_buf
[j
]) {
618 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
619 HT_RX_REORDER_BUF_TIMEOUT
))
620 goto set_release_timer
;
622 #ifdef CONFIG_MAC80211_HT_DEBUG
624 wiphy_debug(hw
->wiphy
,
625 "release an RX reorder frame due to timeout on earlier frames\n");
627 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
630 * Increment the head seq# also for the skipped slots.
632 tid_agg_rx
->head_seq_num
=
633 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
636 } else while (tid_agg_rx
->reorder_buf
[index
]) {
637 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
638 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
639 tid_agg_rx
->buf_size
;
642 if (tid_agg_rx
->stored_mpdu_num
) {
643 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
644 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
646 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
647 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
648 if (tid_agg_rx
->reorder_buf
[j
])
654 mod_timer(&tid_agg_rx
->reorder_timer
,
655 tid_agg_rx
->reorder_time
[j
] + 1 +
656 HT_RX_REORDER_BUF_TIMEOUT
);
658 del_timer(&tid_agg_rx
->reorder_timer
);
663 * As this function belongs to the RX path it must be under
664 * rcu_read_lock protection. It returns false if the frame
665 * can be processed immediately, true if it was consumed.
667 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
668 struct tid_ampdu_rx
*tid_agg_rx
,
671 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
672 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
673 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
674 u16 head_seq_num
, buf_size
;
678 spin_lock(&tid_agg_rx
->reorder_lock
);
680 buf_size
= tid_agg_rx
->buf_size
;
681 head_seq_num
= tid_agg_rx
->head_seq_num
;
683 /* frame with out of date sequence number */
684 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
690 * If frame the sequence number exceeds our buffering window
691 * size release some previous frames to make room for this one.
693 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
694 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
695 /* release stored frames up to new head to stack */
696 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
699 /* Now the new frame is always in the range of the reordering buffer */
701 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
703 /* check if we already stored this frame */
704 if (tid_agg_rx
->reorder_buf
[index
]) {
710 * If the current MPDU is in the right order and nothing else
711 * is stored we can process it directly, no need to buffer it.
712 * If it is first but there's something stored, we may be able
713 * to release frames after this one.
715 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
716 tid_agg_rx
->stored_mpdu_num
== 0) {
717 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
722 /* put the frame in the reordering buffer */
723 tid_agg_rx
->reorder_buf
[index
] = skb
;
724 tid_agg_rx
->reorder_time
[index
] = jiffies
;
725 tid_agg_rx
->stored_mpdu_num
++;
726 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
729 spin_unlock(&tid_agg_rx
->reorder_lock
);
734 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
735 * true if the MPDU was buffered, false if it should be processed.
737 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
739 struct sk_buff
*skb
= rx
->skb
;
740 struct ieee80211_local
*local
= rx
->local
;
741 struct ieee80211_hw
*hw
= &local
->hw
;
742 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
743 struct sta_info
*sta
= rx
->sta
;
744 struct tid_ampdu_rx
*tid_agg_rx
;
748 if (!ieee80211_is_data_qos(hdr
->frame_control
))
752 * filter the QoS data rx stream according to
753 * STA/TID and check if this STA/TID is on aggregation
759 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
761 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
765 /* qos null data frames are excluded */
766 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
769 /* new, potentially un-ordered, ampdu frame - process it */
771 /* reset session timer */
772 if (tid_agg_rx
->timeout
)
773 mod_timer(&tid_agg_rx
->session_timer
,
774 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
776 /* if this mpdu is fragmented - terminate rx aggregation session */
777 sc
= le16_to_cpu(hdr
->seq_ctrl
);
778 if (sc
& IEEE80211_SCTL_FRAG
) {
779 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
780 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
781 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
786 * No locking needed -- we will only ever process one
787 * RX packet at a time, and thus own tid_agg_rx. All
788 * other code manipulating it needs to (and does) make
789 * sure that we cannot get to it any more before doing
792 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
796 skb_queue_tail(&local
->rx_skb_queue
, skb
);
799 static ieee80211_rx_result debug_noinline
800 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
802 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
803 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
805 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
806 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
807 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
808 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
810 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
811 rx
->local
->dot11FrameDuplicateCount
++;
812 rx
->sta
->num_duplicates
++;
814 return RX_DROP_UNUSABLE
;
816 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
819 if (unlikely(rx
->skb
->len
< 16)) {
820 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
821 return RX_DROP_MONITOR
;
824 /* Drop disallowed frame classes based on STA auth/assoc state;
825 * IEEE 802.11, Chap 5.5.
827 * mac80211 filters only based on association state, i.e. it drops
828 * Class 3 frames from not associated stations. hostapd sends
829 * deauth/disassoc frames when needed. In addition, hostapd is
830 * responsible for filtering on both auth and assoc states.
833 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
834 return ieee80211_rx_mesh_check(rx
);
836 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
837 ieee80211_is_pspoll(hdr
->frame_control
)) &&
838 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
839 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
840 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
))))
841 return RX_DROP_MONITOR
;
847 static ieee80211_rx_result debug_noinline
848 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
850 struct sk_buff
*skb
= rx
->skb
;
851 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
852 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
855 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
856 struct ieee80211_key
*sta_ptk
= NULL
;
857 int mmie_keyidx
= -1;
863 * There are four types of keys:
865 * - IGTK (group keys for management frames)
866 * - PTK (pairwise keys)
867 * - STK (station-to-station pairwise keys)
869 * When selecting a key, we have to distinguish between multicast
870 * (including broadcast) and unicast frames, the latter can only
871 * use PTKs and STKs while the former always use GTKs and IGTKs.
872 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
873 * unicast frames can also use key indices like GTKs. Hence, if we
874 * don't have a PTK/STK we check the key index for a WEP key.
876 * Note that in a regular BSS, multicast frames are sent by the
877 * AP only, associated stations unicast the frame to the AP first
878 * which then multicasts it on their behalf.
880 * There is also a slight problem in IBSS mode: GTKs are negotiated
881 * with each station, that is something we don't currently handle.
882 * The spec seems to expect that one negotiates the same key with
883 * every station but there's no such requirement; VLANs could be
888 * No point in finding a key and decrypting if the frame is neither
889 * addressed to us nor a multicast frame.
891 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
894 /* start without a key */
898 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
900 fc
= hdr
->frame_control
;
902 if (!ieee80211_has_protected(fc
))
903 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
905 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
907 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
908 (status
->flag
& RX_FLAG_IV_STRIPPED
))
910 /* Skip decryption if the frame is not protected. */
911 if (!ieee80211_has_protected(fc
))
913 } else if (mmie_keyidx
>= 0) {
914 /* Broadcast/multicast robust management frame / BIP */
915 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
916 (status
->flag
& RX_FLAG_IV_STRIPPED
))
919 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
920 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
921 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
923 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
925 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
926 } else if (!ieee80211_has_protected(fc
)) {
928 * The frame was not protected, so skip decryption. However, we
929 * need to set rx->key if there is a key that could have been
930 * used so that the frame may be dropped if encryption would
931 * have been expected.
933 struct ieee80211_key
*key
= NULL
;
934 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
937 if (ieee80211_is_mgmt(fc
) &&
938 is_multicast_ether_addr(hdr
->addr1
) &&
939 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
943 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
944 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
950 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
951 key
= rcu_dereference(sdata
->keys
[i
]);
963 * The device doesn't give us the IV so we won't be
964 * able to look up the key. That's ok though, we
965 * don't need to decrypt the frame, we just won't
966 * be able to keep statistics accurate.
967 * Except for key threshold notifications, should
968 * we somehow allow the driver to tell us which key
969 * the hardware used if this flag is set?
971 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
972 (status
->flag
& RX_FLAG_IV_STRIPPED
))
975 hdrlen
= ieee80211_hdrlen(fc
);
977 if (rx
->skb
->len
< 8 + hdrlen
)
978 return RX_DROP_UNUSABLE
; /* TODO: count this? */
981 * no need to call ieee80211_wep_get_keyidx,
982 * it verifies a bunch of things we've done already
984 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
987 /* check per-station GTK first, if multicast packet */
988 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
989 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
991 /* if not found, try default key */
993 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
996 * RSNA-protected unicast frames should always be
997 * sent with pairwise or station-to-station keys,
998 * but for WEP we allow using a key index as well.
1001 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1002 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1003 !is_multicast_ether_addr(hdr
->addr1
))
1009 rx
->key
->tx_rx_count
++;
1010 /* TODO: add threshold stuff again */
1012 return RX_DROP_MONITOR
;
1015 if (skb_linearize(rx
->skb
))
1016 return RX_DROP_UNUSABLE
;
1017 /* the hdr variable is invalid now! */
1019 switch (rx
->key
->conf
.cipher
) {
1020 case WLAN_CIPHER_SUITE_WEP40
:
1021 case WLAN_CIPHER_SUITE_WEP104
:
1022 /* Check for weak IVs if possible */
1023 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1024 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1025 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1026 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1027 rx
->sta
->wep_weak_iv_count
++;
1029 result
= ieee80211_crypto_wep_decrypt(rx
);
1031 case WLAN_CIPHER_SUITE_TKIP
:
1032 result
= ieee80211_crypto_tkip_decrypt(rx
);
1034 case WLAN_CIPHER_SUITE_CCMP
:
1035 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1037 case WLAN_CIPHER_SUITE_AES_CMAC
:
1038 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1042 * We can reach here only with HW-only algorithms
1043 * but why didn't it decrypt the frame?!
1045 return RX_DROP_UNUSABLE
;
1048 /* either the frame has been decrypted or will be dropped */
1049 status
->flag
|= RX_FLAG_DECRYPTED
;
1054 static ieee80211_rx_result debug_noinline
1055 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1057 struct ieee80211_local
*local
;
1058 struct ieee80211_hdr
*hdr
;
1059 struct sk_buff
*skb
;
1063 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1065 if (!local
->pspolling
)
1068 if (!ieee80211_has_fromds(hdr
->frame_control
))
1069 /* this is not from AP */
1072 if (!ieee80211_is_data(hdr
->frame_control
))
1075 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1076 /* AP has no more frames buffered for us */
1077 local
->pspolling
= false;
1081 /* more data bit is set, let's request a new frame from the AP */
1082 ieee80211_send_pspoll(local
, rx
->sdata
);
1087 static void ap_sta_ps_start(struct sta_info
*sta
)
1089 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1090 struct ieee80211_local
*local
= sdata
->local
;
1092 atomic_inc(&sdata
->bss
->num_sta_ps
);
1093 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1094 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1095 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1096 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1097 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1098 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1099 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1102 static void ap_sta_ps_end(struct sta_info
*sta
)
1104 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1106 atomic_dec(&sdata
->bss
->num_sta_ps
);
1108 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1109 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1110 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1111 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1113 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1114 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1115 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1116 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1117 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1121 ieee80211_sta_ps_deliver_wakeup(sta
);
1124 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1126 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1129 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1131 /* Don't let the same PS state be set twice */
1132 in_ps
= test_sta_flags(sta_inf
, WLAN_STA_PS_STA
);
1133 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1137 ap_sta_ps_start(sta_inf
);
1139 ap_sta_ps_end(sta_inf
);
1143 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1145 static ieee80211_rx_result debug_noinline
1146 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1148 struct sta_info
*sta
= rx
->sta
;
1149 struct sk_buff
*skb
= rx
->skb
;
1150 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1151 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1157 * Update last_rx only for IBSS packets which are for the current
1158 * BSSID to avoid keeping the current IBSS network alive in cases
1159 * where other STAs start using different BSSID.
1161 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1162 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1163 NL80211_IFTYPE_ADHOC
);
1164 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1165 sta
->last_rx
= jiffies
;
1166 if (ieee80211_is_data(hdr
->frame_control
)) {
1167 sta
->last_rx_rate_idx
= status
->rate_idx
;
1168 sta
->last_rx_rate_flag
= status
->flag
;
1171 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1173 * Mesh beacons will update last_rx when if they are found to
1174 * match the current local configuration when processed.
1176 sta
->last_rx
= jiffies
;
1177 if (ieee80211_is_data(hdr
->frame_control
)) {
1178 sta
->last_rx_rate_idx
= status
->rate_idx
;
1179 sta
->last_rx_rate_flag
= status
->flag
;
1183 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1186 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1187 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1189 sta
->rx_fragments
++;
1190 sta
->rx_bytes
+= rx
->skb
->len
;
1191 sta
->last_signal
= status
->signal
;
1192 ewma_add(&sta
->avg_signal
, -status
->signal
);
1195 * Change STA power saving mode only at the end of a frame
1196 * exchange sequence.
1198 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1199 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1200 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1201 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1202 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1203 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1205 * Ignore doze->wake transitions that are
1206 * indicated by non-data frames, the standard
1207 * is unclear here, but for example going to
1208 * PS mode and then scanning would cause a
1209 * doze->wake transition for the probe request,
1210 * and that is clearly undesirable.
1212 if (ieee80211_is_data(hdr
->frame_control
) &&
1213 !ieee80211_has_pm(hdr
->frame_control
))
1216 if (ieee80211_has_pm(hdr
->frame_control
))
1217 ap_sta_ps_start(sta
);
1222 * Drop (qos-)data::nullfunc frames silently, since they
1223 * are used only to control station power saving mode.
1225 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1226 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1227 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1230 * If we receive a 4-addr nullfunc frame from a STA
1231 * that was not moved to a 4-addr STA vlan yet, drop
1232 * the frame to the monitor interface, to make sure
1233 * that hostapd sees it
1235 if (ieee80211_has_a4(hdr
->frame_control
) &&
1236 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1237 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1238 !rx
->sdata
->u
.vlan
.sta
)))
1239 return RX_DROP_MONITOR
;
1241 * Update counter and free packet here to avoid
1242 * counting this as a dropped packed.
1245 dev_kfree_skb(rx
->skb
);
1250 } /* ieee80211_rx_h_sta_process */
1252 static inline struct ieee80211_fragment_entry
*
1253 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1254 unsigned int frag
, unsigned int seq
, int rx_queue
,
1255 struct sk_buff
**skb
)
1257 struct ieee80211_fragment_entry
*entry
;
1260 idx
= sdata
->fragment_next
;
1261 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1262 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1263 sdata
->fragment_next
= 0;
1265 if (!skb_queue_empty(&entry
->skb_list
)) {
1266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1267 struct ieee80211_hdr
*hdr
=
1268 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1269 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1270 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1271 "addr1=%pM addr2=%pM\n",
1273 jiffies
- entry
->first_frag_time
, entry
->seq
,
1274 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1276 __skb_queue_purge(&entry
->skb_list
);
1279 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1281 entry
->first_frag_time
= jiffies
;
1283 entry
->rx_queue
= rx_queue
;
1284 entry
->last_frag
= frag
;
1286 entry
->extra_len
= 0;
1291 static inline struct ieee80211_fragment_entry
*
1292 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1293 unsigned int frag
, unsigned int seq
,
1294 int rx_queue
, struct ieee80211_hdr
*hdr
)
1296 struct ieee80211_fragment_entry
*entry
;
1299 idx
= sdata
->fragment_next
;
1300 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1301 struct ieee80211_hdr
*f_hdr
;
1305 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1307 entry
= &sdata
->fragments
[idx
];
1308 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1309 entry
->rx_queue
!= rx_queue
||
1310 entry
->last_frag
+ 1 != frag
)
1313 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1316 * Check ftype and addresses are equal, else check next fragment
1318 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1319 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1320 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1321 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1324 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1325 __skb_queue_purge(&entry
->skb_list
);
1334 static ieee80211_rx_result debug_noinline
1335 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1337 struct ieee80211_hdr
*hdr
;
1340 unsigned int frag
, seq
;
1341 struct ieee80211_fragment_entry
*entry
;
1342 struct sk_buff
*skb
;
1343 struct ieee80211_rx_status
*status
;
1345 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1346 fc
= hdr
->frame_control
;
1347 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1348 frag
= sc
& IEEE80211_SCTL_FRAG
;
1350 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1351 (rx
->skb
)->len
< 24 ||
1352 is_multicast_ether_addr(hdr
->addr1
))) {
1353 /* not fragmented */
1356 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1358 if (skb_linearize(rx
->skb
))
1359 return RX_DROP_UNUSABLE
;
1362 * skb_linearize() might change the skb->data and
1363 * previously cached variables (in this case, hdr) need to
1364 * be refreshed with the new data.
1366 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1367 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1370 /* This is the first fragment of a new frame. */
1371 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1372 rx
->queue
, &(rx
->skb
));
1373 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1374 ieee80211_has_protected(fc
)) {
1375 int queue
= ieee80211_is_mgmt(fc
) ?
1376 NUM_RX_DATA_QUEUES
: rx
->queue
;
1377 /* Store CCMP PN so that we can verify that the next
1378 * fragment has a sequential PN value. */
1380 memcpy(entry
->last_pn
,
1381 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1387 /* This is a fragment for a frame that should already be pending in
1388 * fragment cache. Add this fragment to the end of the pending entry.
1390 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1392 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1393 return RX_DROP_MONITOR
;
1396 /* Verify that MPDUs within one MSDU have sequential PN values.
1397 * (IEEE 802.11i, 8.3.3.4.5) */
1400 u8 pn
[CCMP_PN_LEN
], *rpn
;
1402 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1403 return RX_DROP_UNUSABLE
;
1404 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1405 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1410 queue
= ieee80211_is_mgmt(fc
) ?
1411 NUM_RX_DATA_QUEUES
: rx
->queue
;
1412 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1413 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1414 return RX_DROP_UNUSABLE
;
1415 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1418 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1419 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1420 entry
->last_frag
= frag
;
1421 entry
->extra_len
+= rx
->skb
->len
;
1422 if (ieee80211_has_morefrags(fc
)) {
1427 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1428 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1429 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1430 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1432 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1433 __skb_queue_purge(&entry
->skb_list
);
1434 return RX_DROP_UNUSABLE
;
1437 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1438 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1442 /* Complete frame has been reassembled - process it now */
1443 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1444 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1448 rx
->sta
->rx_packets
++;
1449 if (is_multicast_ether_addr(hdr
->addr1
))
1450 rx
->local
->dot11MulticastReceivedFrameCount
++;
1452 ieee80211_led_rx(rx
->local
);
1456 static ieee80211_rx_result debug_noinline
1457 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1459 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1460 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1461 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1463 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1464 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
)))
1467 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1468 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1469 return RX_DROP_UNUSABLE
;
1471 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1472 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1474 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1476 /* Free PS Poll skb here instead of returning RX_DROP that would
1477 * count as an dropped frame. */
1478 dev_kfree_skb(rx
->skb
);
1483 static ieee80211_rx_result debug_noinline
1484 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1486 u8
*data
= rx
->skb
->data
;
1487 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1489 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1492 /* remove the qos control field, update frame type and meta-data */
1493 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1494 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1495 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1496 /* change frame type to non QOS */
1497 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1503 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1505 if (unlikely(!rx
->sta
||
1506 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1513 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1515 struct sk_buff
*skb
= rx
->skb
;
1516 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1519 * Pass through unencrypted frames if the hardware has
1520 * decrypted them already.
1522 if (status
->flag
& RX_FLAG_DECRYPTED
)
1525 /* Drop unencrypted frames if key is set. */
1526 if (unlikely(!ieee80211_has_protected(fc
) &&
1527 !ieee80211_is_nullfunc(fc
) &&
1528 ieee80211_is_data(fc
) &&
1529 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1536 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1538 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1539 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1540 __le16 fc
= hdr
->frame_control
;
1543 * Pass through unencrypted frames if the hardware has
1544 * decrypted them already.
1546 if (status
->flag
& RX_FLAG_DECRYPTED
)
1549 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1550 if (unlikely(!ieee80211_has_protected(fc
) &&
1551 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1553 if (ieee80211_is_deauth(fc
))
1554 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1557 else if (ieee80211_is_disassoc(fc
))
1558 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1563 /* BIP does not use Protected field, so need to check MMIE */
1564 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1565 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1566 if (ieee80211_is_deauth(fc
))
1567 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1570 else if (ieee80211_is_disassoc(fc
))
1571 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1577 * When using MFP, Action frames are not allowed prior to
1578 * having configured keys.
1580 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1581 ieee80211_is_robust_mgmt_frame(
1582 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1590 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1592 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1593 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1594 bool check_port_control
= false;
1595 struct ethhdr
*ehdr
;
1598 *port_control
= false;
1599 if (ieee80211_has_a4(hdr
->frame_control
) &&
1600 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1603 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1604 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1606 if (!sdata
->u
.mgd
.use_4addr
)
1609 check_port_control
= true;
1612 if (is_multicast_ether_addr(hdr
->addr1
) &&
1613 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1616 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1620 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1621 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1622 *port_control
= true;
1623 else if (check_port_control
)
1630 * requires that rx->skb is a frame with ethernet header
1632 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1634 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1635 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1636 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1639 * Allow EAPOL frames to us/the PAE group address regardless
1640 * of whether the frame was encrypted or not.
1642 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1643 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1644 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1647 if (ieee80211_802_1x_port_control(rx
) ||
1648 ieee80211_drop_unencrypted(rx
, fc
))
1655 * requires that rx->skb is a frame with ethernet header
1658 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1660 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1661 struct net_device
*dev
= sdata
->dev
;
1662 struct sk_buff
*skb
, *xmit_skb
;
1663 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1664 struct sta_info
*dsta
;
1665 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1670 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1671 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1672 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1673 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1674 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1675 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1677 * send multicast frames both to higher layers in
1678 * local net stack and back to the wireless medium
1680 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1681 if (!xmit_skb
&& net_ratelimit())
1682 printk(KERN_DEBUG
"%s: failed to clone "
1683 "multicast frame\n", dev
->name
);
1685 dsta
= sta_info_get(sdata
, skb
->data
);
1688 * The destination station is associated to
1689 * this AP (in this VLAN), so send the frame
1690 * directly to it and do not pass it to local
1700 int align __maybe_unused
;
1702 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1704 * 'align' will only take the values 0 or 2 here
1705 * since all frames are required to be aligned
1706 * to 2-byte boundaries when being passed to
1707 * mac80211. That also explains the __skb_push()
1710 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1712 if (WARN_ON(skb_headroom(skb
) < 3)) {
1716 u8
*data
= skb
->data
;
1717 size_t len
= skb_headlen(skb
);
1719 memmove(skb
->data
, data
, len
);
1720 skb_set_tail_pointer(skb
, len
);
1726 /* deliver to local stack */
1727 skb
->protocol
= eth_type_trans(skb
, dev
);
1728 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1729 netif_receive_skb(skb
);
1734 /* send to wireless media */
1735 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1736 skb_reset_network_header(xmit_skb
);
1737 skb_reset_mac_header(xmit_skb
);
1738 dev_queue_xmit(xmit_skb
);
1742 static ieee80211_rx_result debug_noinline
1743 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1745 struct net_device
*dev
= rx
->sdata
->dev
;
1746 struct sk_buff
*skb
= rx
->skb
;
1747 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1748 __le16 fc
= hdr
->frame_control
;
1749 struct sk_buff_head frame_list
;
1750 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1752 if (unlikely(!ieee80211_is_data(fc
)))
1755 if (unlikely(!ieee80211_is_data_present(fc
)))
1756 return RX_DROP_MONITOR
;
1758 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1761 if (ieee80211_has_a4(hdr
->frame_control
) &&
1762 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1763 !rx
->sdata
->u
.vlan
.sta
)
1764 return RX_DROP_UNUSABLE
;
1766 if (is_multicast_ether_addr(hdr
->addr1
) &&
1767 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1768 rx
->sdata
->u
.vlan
.sta
) ||
1769 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1770 rx
->sdata
->u
.mgd
.use_4addr
)))
1771 return RX_DROP_UNUSABLE
;
1774 __skb_queue_head_init(&frame_list
);
1776 if (skb_linearize(skb
))
1777 return RX_DROP_UNUSABLE
;
1779 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1780 rx
->sdata
->vif
.type
,
1781 rx
->local
->hw
.extra_tx_headroom
);
1783 while (!skb_queue_empty(&frame_list
)) {
1784 rx
->skb
= __skb_dequeue(&frame_list
);
1786 if (!ieee80211_frame_allowed(rx
, fc
)) {
1787 dev_kfree_skb(rx
->skb
);
1790 dev
->stats
.rx_packets
++;
1791 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1793 ieee80211_deliver_skb(rx
);
1799 #ifdef CONFIG_MAC80211_MESH
1800 static ieee80211_rx_result
1801 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1803 struct ieee80211_hdr
*hdr
;
1804 struct ieee80211s_hdr
*mesh_hdr
;
1805 unsigned int hdrlen
;
1806 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1807 struct ieee80211_local
*local
= rx
->local
;
1808 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1809 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1811 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1812 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1813 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1815 if (!ieee80211_is_data(hdr
->frame_control
))
1820 return RX_DROP_MONITOR
;
1822 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1823 struct mesh_path
*mppath
;
1827 if (is_multicast_ether_addr(hdr
->addr1
)) {
1828 mpp_addr
= hdr
->addr3
;
1829 proxied_addr
= mesh_hdr
->eaddr1
;
1831 mpp_addr
= hdr
->addr4
;
1832 proxied_addr
= mesh_hdr
->eaddr2
;
1836 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1838 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1840 spin_lock_bh(&mppath
->state_lock
);
1841 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1842 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1843 spin_unlock_bh(&mppath
->state_lock
);
1848 /* Frame has reached destination. Don't forward */
1849 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1850 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1855 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1857 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1858 dropped_frames_ttl
);
1860 struct ieee80211_hdr
*fwd_hdr
;
1861 struct ieee80211_tx_info
*info
;
1863 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1865 if (!fwd_skb
&& net_ratelimit())
1866 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1871 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1872 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1873 info
= IEEE80211_SKB_CB(fwd_skb
);
1874 memset(info
, 0, sizeof(*info
));
1875 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1876 info
->control
.vif
= &rx
->sdata
->vif
;
1877 skb_set_queue_mapping(skb
,
1878 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1879 ieee80211_set_qos_hdr(local
, skb
);
1880 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1881 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1886 * Save TA to addr1 to send TA a path error if a
1887 * suitable next hop is not found
1889 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1891 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1892 /* Failed to immediately resolve next hop:
1893 * fwded frame was dropped or will be added
1894 * later to the pending skb queue. */
1896 return RX_DROP_MONITOR
;
1898 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1901 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1903 ieee80211_add_pending_skb(local
, fwd_skb
);
1908 if (is_multicast_ether_addr(hdr
->addr1
) ||
1909 sdata
->dev
->flags
& IFF_PROMISC
)
1912 return RX_DROP_MONITOR
;
1916 static ieee80211_rx_result debug_noinline
1917 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1919 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1920 struct ieee80211_local
*local
= rx
->local
;
1921 struct net_device
*dev
= sdata
->dev
;
1922 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1923 __le16 fc
= hdr
->frame_control
;
1927 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1930 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1931 return RX_DROP_MONITOR
;
1934 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1935 * that a 4-addr station can be detected and moved into a separate VLAN
1937 if (ieee80211_has_a4(hdr
->frame_control
) &&
1938 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1939 return RX_DROP_MONITOR
;
1941 err
= __ieee80211_data_to_8023(rx
, &port_control
);
1943 return RX_DROP_UNUSABLE
;
1945 if (!ieee80211_frame_allowed(rx
, fc
))
1946 return RX_DROP_MONITOR
;
1948 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1949 unlikely(port_control
) && sdata
->bss
) {
1950 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
1958 dev
->stats
.rx_packets
++;
1959 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1961 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
1962 !is_multicast_ether_addr(
1963 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
1964 (!local
->scanning
&&
1965 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
1966 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1967 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1970 ieee80211_deliver_skb(rx
);
1975 static ieee80211_rx_result debug_noinline
1976 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
1978 struct ieee80211_local
*local
= rx
->local
;
1979 struct ieee80211_hw
*hw
= &local
->hw
;
1980 struct sk_buff
*skb
= rx
->skb
;
1981 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1982 struct tid_ampdu_rx
*tid_agg_rx
;
1986 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1989 if (ieee80211_is_back_req(bar
->frame_control
)) {
1991 __le16 control
, start_seq_num
;
1992 } __packed bar_data
;
1995 return RX_DROP_MONITOR
;
1997 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
1998 &bar_data
, sizeof(bar_data
)))
1999 return RX_DROP_MONITOR
;
2001 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2003 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2005 return RX_DROP_MONITOR
;
2007 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2009 /* reset session timer */
2010 if (tid_agg_rx
->timeout
)
2011 mod_timer(&tid_agg_rx
->session_timer
,
2012 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2014 spin_lock(&tid_agg_rx
->reorder_lock
);
2015 /* release stored frames up to start of BAR */
2016 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2017 spin_unlock(&tid_agg_rx
->reorder_lock
);
2024 * After this point, we only want management frames,
2025 * so we can drop all remaining control frames to
2026 * cooked monitor interfaces.
2028 return RX_DROP_MONITOR
;
2031 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2032 struct ieee80211_mgmt
*mgmt
,
2035 struct ieee80211_local
*local
= sdata
->local
;
2036 struct sk_buff
*skb
;
2037 struct ieee80211_mgmt
*resp
;
2039 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2040 /* Not to own unicast address */
2044 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2045 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2046 /* Not from the current AP or not associated yet. */
2050 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2051 /* Too short SA Query request frame */
2055 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2059 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2060 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2061 memset(resp
, 0, 24);
2062 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2063 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2064 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2065 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2066 IEEE80211_STYPE_ACTION
);
2067 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2068 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2069 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2070 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2071 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2072 WLAN_SA_QUERY_TR_ID_LEN
);
2074 ieee80211_tx_skb(sdata
, skb
);
2077 static ieee80211_rx_result debug_noinline
2078 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2080 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2081 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2084 * From here on, look only at management frames.
2085 * Data and control frames are already handled,
2086 * and unknown (reserved) frames are useless.
2088 if (rx
->skb
->len
< 24)
2089 return RX_DROP_MONITOR
;
2091 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2092 return RX_DROP_MONITOR
;
2094 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2095 return RX_DROP_MONITOR
;
2097 if (ieee80211_drop_unencrypted_mgmt(rx
))
2098 return RX_DROP_UNUSABLE
;
2103 static ieee80211_rx_result debug_noinline
2104 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2106 struct ieee80211_local
*local
= rx
->local
;
2107 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2108 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2109 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2110 int len
= rx
->skb
->len
;
2112 if (!ieee80211_is_action(mgmt
->frame_control
))
2115 /* drop too small frames */
2116 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2117 return RX_DROP_UNUSABLE
;
2119 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2120 return RX_DROP_UNUSABLE
;
2122 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2123 return RX_DROP_UNUSABLE
;
2125 switch (mgmt
->u
.action
.category
) {
2126 case WLAN_CATEGORY_BACK
:
2128 * The aggregation code is not prepared to handle
2129 * anything but STA/AP due to the BSSID handling;
2130 * IBSS could work in the code but isn't supported
2131 * by drivers or the standard.
2133 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2134 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2135 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2138 /* verify action_code is present */
2139 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2142 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2143 case WLAN_ACTION_ADDBA_REQ
:
2144 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2145 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2148 case WLAN_ACTION_ADDBA_RESP
:
2149 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2150 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2153 case WLAN_ACTION_DELBA
:
2154 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2155 sizeof(mgmt
->u
.action
.u
.delba
)))
2163 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2164 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2167 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2170 /* verify action_code is present */
2171 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2174 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2175 case WLAN_ACTION_SPCT_MSR_REQ
:
2176 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2177 sizeof(mgmt
->u
.action
.u
.measurement
)))
2179 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2181 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2182 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2183 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2186 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2189 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2195 case WLAN_CATEGORY_SA_QUERY
:
2196 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2197 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2200 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2201 case WLAN_ACTION_SA_QUERY_REQUEST
:
2202 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2204 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2208 case WLAN_CATEGORY_MESH_PLINK
:
2209 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2212 case WLAN_CATEGORY_MESH_PATH_SEL
:
2213 if (!mesh_path_sel_is_hwmp(sdata
))
2221 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2222 /* will return in the next handlers */
2227 rx
->sta
->rx_packets
++;
2228 dev_kfree_skb(rx
->skb
);
2232 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2233 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2234 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2236 rx
->sta
->rx_packets
++;
2240 static ieee80211_rx_result debug_noinline
2241 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2243 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2245 /* skip known-bad action frames and return them in the next handler */
2246 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2250 * Getting here means the kernel doesn't know how to handle
2251 * it, but maybe userspace does ... include returned frames
2252 * so userspace can register for those to know whether ones
2253 * it transmitted were processed or returned.
2256 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2257 rx
->skb
->data
, rx
->skb
->len
,
2260 rx
->sta
->rx_packets
++;
2261 dev_kfree_skb(rx
->skb
);
2269 static ieee80211_rx_result debug_noinline
2270 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2272 struct ieee80211_local
*local
= rx
->local
;
2273 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2274 struct sk_buff
*nskb
;
2275 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2276 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2278 if (!ieee80211_is_action(mgmt
->frame_control
))
2282 * For AP mode, hostapd is responsible for handling any action
2283 * frames that we didn't handle, including returning unknown
2284 * ones. For all other modes we will return them to the sender,
2285 * setting the 0x80 bit in the action category, as required by
2286 * 802.11-2007 7.3.1.11.
2287 * Newer versions of hostapd shall also use the management frame
2288 * registration mechanisms, but older ones still use cooked
2289 * monitor interfaces so push all frames there.
2291 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2292 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2293 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2294 return RX_DROP_MONITOR
;
2296 /* do not return rejected action frames */
2297 if (mgmt
->u
.action
.category
& 0x80)
2298 return RX_DROP_UNUSABLE
;
2300 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2303 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2305 nmgmt
->u
.action
.category
|= 0x80;
2306 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2307 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2309 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2311 ieee80211_tx_skb(rx
->sdata
, nskb
);
2313 dev_kfree_skb(rx
->skb
);
2317 static ieee80211_rx_result debug_noinline
2318 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2320 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2321 ieee80211_rx_result rxs
;
2322 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2325 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2326 if (rxs
!= RX_CONTINUE
)
2329 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2331 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2332 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2333 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2334 return RX_DROP_MONITOR
;
2337 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2338 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2339 /* process for all: mesh, mlme, ibss */
2341 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2342 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2343 if (is_multicast_ether_addr(mgmt
->da
) &&
2344 !is_broadcast_ether_addr(mgmt
->da
))
2345 return RX_DROP_MONITOR
;
2347 /* process only for station */
2348 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2349 return RX_DROP_MONITOR
;
2351 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2352 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2353 /* process only for ibss */
2354 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2355 return RX_DROP_MONITOR
;
2358 return RX_DROP_MONITOR
;
2361 /* queue up frame and kick off work to process it */
2362 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2363 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2364 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2366 rx
->sta
->rx_packets
++;
2371 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2372 struct ieee80211_rx_data
*rx
)
2375 unsigned int hdrlen
;
2377 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2378 if (rx
->skb
->len
>= hdrlen
+ 4)
2379 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2385 * Some hardware seem to generate incorrect Michael MIC
2386 * reports; ignore them to avoid triggering countermeasures.
2391 if (!ieee80211_has_protected(hdr
->frame_control
))
2394 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2396 * APs with pairwise keys should never receive Michael MIC
2397 * errors for non-zero keyidx because these are reserved for
2398 * group keys and only the AP is sending real multicast
2399 * frames in the BSS.
2404 if (!ieee80211_is_data(hdr
->frame_control
) &&
2405 !ieee80211_is_auth(hdr
->frame_control
))
2408 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2412 /* TODO: use IEEE80211_RX_FRAGMENTED */
2413 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2414 struct ieee80211_rate
*rate
)
2416 struct ieee80211_sub_if_data
*sdata
;
2417 struct ieee80211_local
*local
= rx
->local
;
2418 struct ieee80211_rtap_hdr
{
2419 struct ieee80211_radiotap_header hdr
;
2425 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2426 struct net_device
*prev_dev
= NULL
;
2427 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2430 * If cooked monitor has been processed already, then
2431 * don't do it again. If not, set the flag.
2433 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2435 rx
->flags
|= IEEE80211_RX_CMNTR
;
2437 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2438 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2441 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2442 memset(rthdr
, 0, sizeof(*rthdr
));
2443 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2444 rthdr
->hdr
.it_present
=
2445 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2446 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2449 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2450 rthdr
->hdr
.it_present
|=
2451 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2453 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2455 if (status
->band
== IEEE80211_BAND_5GHZ
)
2456 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2457 IEEE80211_CHAN_5GHZ
);
2459 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2460 IEEE80211_CHAN_2GHZ
);
2462 skb_set_mac_header(skb
, 0);
2463 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2464 skb
->pkt_type
= PACKET_OTHERHOST
;
2465 skb
->protocol
= htons(ETH_P_802_2
);
2467 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2468 if (!ieee80211_sdata_running(sdata
))
2471 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2472 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2476 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2478 skb2
->dev
= prev_dev
;
2479 netif_receive_skb(skb2
);
2483 prev_dev
= sdata
->dev
;
2484 sdata
->dev
->stats
.rx_packets
++;
2485 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2489 skb
->dev
= prev_dev
;
2490 netif_receive_skb(skb
);
2498 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2499 ieee80211_rx_result res
)
2502 case RX_DROP_MONITOR
:
2503 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2505 rx
->sta
->rx_dropped
++;
2508 struct ieee80211_rate
*rate
= NULL
;
2509 struct ieee80211_supported_band
*sband
;
2510 struct ieee80211_rx_status
*status
;
2512 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2514 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2515 if (!(status
->flag
& RX_FLAG_HT
))
2516 rate
= &sband
->bitrates
[status
->rate_idx
];
2518 ieee80211_rx_cooked_monitor(rx
, rate
);
2521 case RX_DROP_UNUSABLE
:
2522 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2524 rx
->sta
->rx_dropped
++;
2525 dev_kfree_skb(rx
->skb
);
2528 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2533 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2535 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2536 struct sk_buff
*skb
;
2538 #define CALL_RXH(rxh) \
2541 if (res != RX_CONTINUE) \
2545 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2546 if (rx
->local
->running_rx_handler
)
2549 rx
->local
->running_rx_handler
= true;
2551 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2552 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2555 * all the other fields are valid across frames
2556 * that belong to an aMPDU since they are on the
2557 * same TID from the same station
2561 CALL_RXH(ieee80211_rx_h_decrypt
)
2562 CALL_RXH(ieee80211_rx_h_check_more_data
)
2563 CALL_RXH(ieee80211_rx_h_sta_process
)
2564 CALL_RXH(ieee80211_rx_h_defragment
)
2565 CALL_RXH(ieee80211_rx_h_ps_poll
)
2566 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2567 /* must be after MMIC verify so header is counted in MPDU mic */
2568 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2569 CALL_RXH(ieee80211_rx_h_amsdu
)
2570 #ifdef CONFIG_MAC80211_MESH
2571 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2572 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2574 CALL_RXH(ieee80211_rx_h_data
)
2575 CALL_RXH(ieee80211_rx_h_ctrl
);
2576 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2577 CALL_RXH(ieee80211_rx_h_action
)
2578 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2579 CALL_RXH(ieee80211_rx_h_action_return
)
2580 CALL_RXH(ieee80211_rx_h_mgmt
)
2583 ieee80211_rx_handlers_result(rx
, res
);
2584 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2588 rx
->local
->running_rx_handler
= false;
2591 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2594 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2596 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2598 #define CALL_RXH(rxh) \
2601 if (res != RX_CONTINUE) \
2605 CALL_RXH(ieee80211_rx_h_passive_scan
)
2606 CALL_RXH(ieee80211_rx_h_check
)
2608 ieee80211_rx_reorder_ampdu(rx
);
2610 ieee80211_rx_handlers(rx
);
2614 ieee80211_rx_handlers_result(rx
, res
);
2620 * This function makes calls into the RX path, therefore
2621 * it has to be invoked under RCU read lock.
2623 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2625 struct ieee80211_rx_data rx
= {
2627 .sdata
= sta
->sdata
,
2628 .local
= sta
->local
,
2632 struct tid_ampdu_rx
*tid_agg_rx
;
2634 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2638 spin_lock(&tid_agg_rx
->reorder_lock
);
2639 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2640 spin_unlock(&tid_agg_rx
->reorder_lock
);
2642 ieee80211_rx_handlers(&rx
);
2645 /* main receive path */
2647 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2648 struct ieee80211_hdr
*hdr
)
2650 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2651 struct sk_buff
*skb
= rx
->skb
;
2652 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2653 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2654 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2656 switch (sdata
->vif
.type
) {
2657 case NL80211_IFTYPE_STATION
:
2658 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2661 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2662 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2663 sdata
->u
.mgd
.use_4addr
)
2665 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2668 case NL80211_IFTYPE_ADHOC
:
2671 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2674 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2675 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2677 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2678 } else if (!multicast
&&
2679 compare_ether_addr(sdata
->vif
.addr
,
2681 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2683 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2684 } else if (!rx
->sta
) {
2686 if (status
->flag
& RX_FLAG_HT
)
2687 rate_idx
= 0; /* TODO: HT rates */
2689 rate_idx
= status
->rate_idx
;
2690 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2691 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2694 case NL80211_IFTYPE_MESH_POINT
:
2696 compare_ether_addr(sdata
->vif
.addr
,
2698 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2701 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2704 case NL80211_IFTYPE_AP_VLAN
:
2705 case NL80211_IFTYPE_AP
:
2707 if (compare_ether_addr(sdata
->vif
.addr
,
2710 } else if (!ieee80211_bssid_match(bssid
,
2712 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2713 !ieee80211_is_beacon(hdr
->frame_control
))
2715 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2718 case NL80211_IFTYPE_WDS
:
2719 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2721 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2725 /* should never get here */
2734 * This function returns whether or not the SKB
2735 * was destined for RX processing or not, which,
2736 * if consume is true, is equivalent to whether
2737 * or not the skb was consumed.
2739 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2740 struct sk_buff
*skb
, bool consume
)
2742 struct ieee80211_local
*local
= rx
->local
;
2743 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2744 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2745 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2749 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2750 prepares
= prepare_for_handlers(rx
, hdr
);
2755 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2756 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
)
2757 ieee80211_rx_michael_mic_report(hdr
, rx
);
2762 skb
= skb_copy(skb
, GFP_ATOMIC
);
2764 if (net_ratelimit())
2765 wiphy_debug(local
->hw
.wiphy
,
2766 "failed to copy skb for %s\n",
2774 ieee80211_invoke_rx_handlers(rx
);
2779 * This is the actual Rx frames handler. as it blongs to Rx path it must
2780 * be called with rcu_read_lock protection.
2782 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2783 struct sk_buff
*skb
)
2785 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2786 struct ieee80211_local
*local
= hw_to_local(hw
);
2787 struct ieee80211_sub_if_data
*sdata
;
2788 struct ieee80211_hdr
*hdr
;
2790 struct ieee80211_rx_data rx
;
2791 struct ieee80211_sub_if_data
*prev
;
2792 struct sta_info
*sta
, *tmp
, *prev_sta
;
2795 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2796 memset(&rx
, 0, sizeof(rx
));
2800 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2801 local
->dot11ReceivedFragmentCount
++;
2803 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2804 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2805 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2807 if (ieee80211_is_mgmt(fc
))
2808 err
= skb_linearize(skb
);
2810 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2817 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2818 ieee80211_parse_qos(&rx
);
2819 ieee80211_verify_alignment(&rx
);
2821 if (ieee80211_is_data(fc
)) {
2824 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2831 rx
.sdata
= prev_sta
->sdata
;
2832 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2839 rx
.sdata
= prev_sta
->sdata
;
2841 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2849 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2850 if (!ieee80211_sdata_running(sdata
))
2853 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2854 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2858 * frame is destined for this interface, but if it's
2859 * not also for the previous one we handle that after
2860 * the loop to avoid copying the SKB once too much
2868 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2870 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2876 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2879 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2888 * This is the receive path handler. It is called by a low level driver when an
2889 * 802.11 MPDU is received from the hardware.
2891 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2893 struct ieee80211_local
*local
= hw_to_local(hw
);
2894 struct ieee80211_rate
*rate
= NULL
;
2895 struct ieee80211_supported_band
*sband
;
2896 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2898 WARN_ON_ONCE(softirq_count() == 0);
2900 if (WARN_ON(status
->band
< 0 ||
2901 status
->band
>= IEEE80211_NUM_BANDS
))
2904 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2905 if (WARN_ON(!sband
))
2909 * If we're suspending, it is possible although not too likely
2910 * that we'd be receiving frames after having already partially
2911 * quiesced the stack. We can't process such frames then since
2912 * that might, for example, cause stations to be added or other
2913 * driver callbacks be invoked.
2915 if (unlikely(local
->quiescing
|| local
->suspended
))
2919 * The same happens when we're not even started,
2920 * but that's worth a warning.
2922 if (WARN_ON(!local
->started
))
2925 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2927 * Validate the rate, unless a PLCP error means that
2928 * we probably can't have a valid rate here anyway.
2931 if (status
->flag
& RX_FLAG_HT
) {
2933 * rate_idx is MCS index, which can be [0-76]
2936 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2938 * Anything else would be some sort of driver or
2939 * hardware error. The driver should catch hardware
2942 if (WARN((status
->rate_idx
< 0 ||
2943 status
->rate_idx
> 76),
2944 "Rate marked as an HT rate but passed "
2945 "status->rate_idx is not "
2946 "an MCS index [0-76]: %d (0x%02x)\n",
2951 if (WARN_ON(status
->rate_idx
< 0 ||
2952 status
->rate_idx
>= sband
->n_bitrates
))
2954 rate
= &sband
->bitrates
[status
->rate_idx
];
2958 status
->rx_flags
= 0;
2961 * key references and virtual interfaces are protected using RCU
2962 * and this requires that we are in a read-side RCU section during
2963 * receive processing
2968 * Frames with failed FCS/PLCP checksum are not returned,
2969 * all other frames are returned without radiotap header
2970 * if it was previously present.
2971 * Also, frames with less than 16 bytes are dropped.
2973 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2979 ieee80211_tpt_led_trig_rx(local
,
2980 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
2982 __ieee80211_rx_handle_packet(hw
, skb
);
2990 EXPORT_SYMBOL(ieee80211_rx
);
2992 /* This is a version of the rx handler that can be called from hard irq
2993 * context. Post the skb on the queue and schedule the tasklet */
2994 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2996 struct ieee80211_local
*local
= hw_to_local(hw
);
2998 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3000 skb
->pkt_type
= IEEE80211_RX_MSG
;
3001 skb_queue_tail(&local
->skb_queue
, skb
);
3002 tasklet_schedule(&local
->tasklet
);
3004 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);