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_TSFT
)
82 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
85 if (len
& 1) /* padding for RX_FLAGS if necessary */
92 * ieee80211_add_rx_radiotap_header - add radiotap header
94 * add a radiotap header containing all the fields which the hardware provided.
97 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
99 struct ieee80211_rate
*rate
,
102 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
103 struct ieee80211_radiotap_header
*rthdr
;
107 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
108 memset(rthdr
, 0, rtap_len
);
110 /* radiotap header, set always present flags */
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
113 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
116 rthdr
->it_len
= cpu_to_le16(rtap_len
);
118 pos
= (unsigned char *)(rthdr
+1);
120 /* the order of the following fields is important */
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status
->flag
& RX_FLAG_TSFT
) {
124 put_unaligned_le64(status
->mactime
, pos
);
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
132 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
133 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
134 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
135 if (status
->flag
& RX_FLAG_SHORTPRE
)
136 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
139 /* IEEE80211_RADIOTAP_RATE */
140 if (status
->flag
& RX_FLAG_HT
) {
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
151 *pos
= rate
->bitrate
/ 5;
155 /* IEEE80211_RADIOTAP_CHANNEL */
156 put_unaligned_le16(status
->freq
, pos
);
158 if (status
->band
== IEEE80211_BAND_5GHZ
)
159 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
161 else if (status
->flag
& RX_FLAG_HT
)
162 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
164 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
168 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
174 *pos
= status
->signal
;
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos
= status
->antenna
;
186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
190 if ((pos
- (u8
*)rthdr
) & 1)
192 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
193 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
194 put_unaligned_le16(rx_flags
, pos
);
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
203 static struct sk_buff
*
204 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
205 struct ieee80211_rate
*rate
)
207 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
208 struct ieee80211_sub_if_data
*sdata
;
209 int needed_headroom
= 0;
210 struct sk_buff
*skb
, *skb2
;
211 struct net_device
*prev_dev
= NULL
;
212 int present_fcs_len
= 0;
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
223 /* room for the radiotap header based on driver features */
224 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
226 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
227 present_fcs_len
= FCS_LEN
;
229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb
, 2)) {
231 dev_kfree_skb(origskb
);
235 if (!local
->monitors
) {
236 if (should_drop_frame(origskb
, present_fcs_len
)) {
237 dev_kfree_skb(origskb
);
241 return remove_monitor_info(local
, origskb
);
244 if (should_drop_frame(origskb
, present_fcs_len
)) {
245 /* only need to expand headroom if necessary */
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
256 if (skb_headroom(skb
) < needed_headroom
&&
257 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
266 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
268 origskb
= remove_monitor_info(local
, origskb
);
274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
277 skb_reset_mac_header(skb
);
278 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
279 skb
->pkt_type
= PACKET_OTHERHOST
;
280 skb
->protocol
= htons(ETH_P_802_2
);
282 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
283 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
286 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
289 if (!ieee80211_sdata_running(sdata
))
293 skb2
= skb_clone(skb
, GFP_ATOMIC
);
295 skb2
->dev
= prev_dev
;
296 netif_receive_skb(skb2
);
300 prev_dev
= sdata
->dev
;
301 sdata
->dev
->stats
.rx_packets
++;
302 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
307 netif_receive_skb(skb
);
315 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
317 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
320 /* does the frame have a qos control field? */
321 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
322 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
323 /* frame has qos control */
324 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
325 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
326 rx
->flags
|= IEEE80211_RX_AMSDU
;
328 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
339 * We also use that counter for non-QoS STAs.
341 tid
= NUM_RX_DATA_QUEUES
- 1;
345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
351 * DOC: Packet alignment
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
375 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
377 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
379 "unaligned packet at 0x%p\n", rx
->skb
->data
);
386 static ieee80211_rx_result debug_noinline
387 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
389 struct ieee80211_local
*local
= rx
->local
;
390 struct sk_buff
*skb
= rx
->skb
;
392 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
393 return ieee80211_scan_rx(rx
->sdata
, skb
);
395 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
396 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
397 /* drop all the other packets during a software scan anyway */
398 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
403 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
406 return RX_DROP_UNUSABLE
;
413 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
415 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
417 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
420 return ieee80211_is_robust_mgmt_frame(hdr
);
424 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
426 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
428 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
431 return ieee80211_is_robust_mgmt_frame(hdr
);
435 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
438 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
439 struct ieee80211_mmie
*mmie
;
441 if (skb
->len
< 24 + sizeof(*mmie
) ||
442 !is_multicast_ether_addr(hdr
->da
))
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
446 return -1; /* not a robust management frame */
448 mmie
= (struct ieee80211_mmie
*)
449 (skb
->data
+ skb
->len
- sizeof(*mmie
));
450 if (mmie
->element_id
!= WLAN_EID_MMIE
||
451 mmie
->length
!= sizeof(*mmie
) - 2)
454 return le16_to_cpu(mmie
->key_id
);
458 static ieee80211_rx_result
459 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
461 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
462 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
463 char *dev_addr
= rx
->sdata
->vif
.addr
;
465 if (ieee80211_is_data(hdr
->frame_control
)) {
466 if (is_multicast_ether_addr(hdr
->addr1
)) {
467 if (ieee80211_has_tods(hdr
->frame_control
) ||
468 !ieee80211_has_fromds(hdr
->frame_control
))
469 return RX_DROP_MONITOR
;
470 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
471 return RX_DROP_MONITOR
;
473 if (!ieee80211_has_a4(hdr
->frame_control
))
474 return RX_DROP_MONITOR
;
475 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
476 return RX_DROP_MONITOR
;
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
484 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
485 struct ieee80211_mgmt
*mgmt
;
487 if (!ieee80211_is_mgmt(hdr
->frame_control
))
488 return RX_DROP_MONITOR
;
490 if (ieee80211_is_action(hdr
->frame_control
)) {
491 mgmt
= (struct ieee80211_mgmt
*)hdr
;
492 if (mgmt
->u
.action
.category
!= WLAN_CATEGORY_MESH_PLINK
)
493 return RX_DROP_MONITOR
;
497 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
498 ieee80211_is_probe_resp(hdr
->frame_control
) ||
499 ieee80211_is_beacon(hdr
->frame_control
))
502 return RX_DROP_MONITOR
;
506 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
508 if (ieee80211_is_data(hdr
->frame_control
) &&
509 is_multicast_ether_addr(hdr
->addr1
) &&
510 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
511 return RX_DROP_MONITOR
;
517 #define SEQ_MODULO 0x1000
518 #define SEQ_MASK 0xfff
520 static inline int seq_less(u16 sq1
, u16 sq2
)
522 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
525 static inline u16
seq_inc(u16 sq
)
527 return (sq
+ 1) & SEQ_MASK
;
530 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
532 return (sq1
- sq2
) & SEQ_MASK
;
536 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
537 struct tid_ampdu_rx
*tid_agg_rx
,
539 struct sk_buff_head
*frames
)
541 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
546 /* release the frame from the reorder ring buffer */
547 tid_agg_rx
->stored_mpdu_num
--;
548 tid_agg_rx
->reorder_buf
[index
] = NULL
;
549 __skb_queue_tail(frames
, skb
);
552 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
555 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
556 struct tid_ampdu_rx
*tid_agg_rx
,
558 struct sk_buff_head
*frames
)
562 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
563 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
564 tid_agg_rx
->buf_size
;
565 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
570 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
571 * the skb was added to the buffer longer than this time ago, the earlier
572 * frames that have not yet been received are assumed to be lost and the skb
573 * can be released for processing. This may also release other skb's from the
574 * reorder buffer if there are no additional gaps between the frames.
576 * Callers must hold tid_agg_rx->reorder_lock.
578 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
580 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
581 struct tid_ampdu_rx
*tid_agg_rx
,
582 struct sk_buff_head
*frames
)
586 /* release the buffer until next missing frame */
587 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
588 tid_agg_rx
->buf_size
;
589 if (!tid_agg_rx
->reorder_buf
[index
] &&
590 tid_agg_rx
->stored_mpdu_num
> 1) {
592 * No buffers ready to be released, but check whether any
593 * frames in the reorder buffer have timed out.
596 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
597 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
598 if (!tid_agg_rx
->reorder_buf
[j
]) {
602 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
603 HT_RX_REORDER_BUF_TIMEOUT
))
604 goto set_release_timer
;
606 #ifdef CONFIG_MAC80211_HT_DEBUG
608 wiphy_debug(hw
->wiphy
,
609 "release an RX reorder frame due to timeout on earlier frames\n");
611 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
615 * Increment the head seq# also for the skipped slots.
617 tid_agg_rx
->head_seq_num
=
618 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
621 } else while (tid_agg_rx
->reorder_buf
[index
]) {
622 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
623 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
624 tid_agg_rx
->buf_size
;
627 if (tid_agg_rx
->stored_mpdu_num
) {
628 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
629 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
631 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
632 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
633 if (tid_agg_rx
->reorder_buf
[j
])
639 mod_timer(&tid_agg_rx
->reorder_timer
,
640 tid_agg_rx
->reorder_time
[j
] +
641 HT_RX_REORDER_BUF_TIMEOUT
);
643 del_timer(&tid_agg_rx
->reorder_timer
);
648 * As this function belongs to the RX path it must be under
649 * rcu_read_lock protection. It returns false if the frame
650 * can be processed immediately, true if it was consumed.
652 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
653 struct tid_ampdu_rx
*tid_agg_rx
,
655 struct sk_buff_head
*frames
)
657 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
658 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
659 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
660 u16 head_seq_num
, buf_size
;
664 buf_size
= tid_agg_rx
->buf_size
;
665 head_seq_num
= tid_agg_rx
->head_seq_num
;
667 spin_lock(&tid_agg_rx
->reorder_lock
);
668 /* frame with out of date sequence number */
669 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
675 * If frame the sequence number exceeds our buffering window
676 * size release some previous frames to make room for this one.
678 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
679 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
680 /* release stored frames up to new head to stack */
681 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
685 /* Now the new frame is always in the range of the reordering buffer */
687 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
689 /* check if we already stored this frame */
690 if (tid_agg_rx
->reorder_buf
[index
]) {
696 * If the current MPDU is in the right order and nothing else
697 * is stored we can process it directly, no need to buffer it.
699 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
700 tid_agg_rx
->stored_mpdu_num
== 0) {
701 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
706 /* put the frame in the reordering buffer */
707 tid_agg_rx
->reorder_buf
[index
] = skb
;
708 tid_agg_rx
->reorder_time
[index
] = jiffies
;
709 tid_agg_rx
->stored_mpdu_num
++;
710 ieee80211_sta_reorder_release(hw
, tid_agg_rx
, frames
);
713 spin_unlock(&tid_agg_rx
->reorder_lock
);
718 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
719 * true if the MPDU was buffered, false if it should be processed.
721 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
722 struct sk_buff_head
*frames
)
724 struct sk_buff
*skb
= rx
->skb
;
725 struct ieee80211_local
*local
= rx
->local
;
726 struct ieee80211_hw
*hw
= &local
->hw
;
727 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
728 struct sta_info
*sta
= rx
->sta
;
729 struct tid_ampdu_rx
*tid_agg_rx
;
733 if (!ieee80211_is_data_qos(hdr
->frame_control
))
737 * filter the QoS data rx stream according to
738 * STA/TID and check if this STA/TID is on aggregation
744 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
746 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
750 /* qos null data frames are excluded */
751 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
754 /* new, potentially un-ordered, ampdu frame - process it */
756 /* reset session timer */
757 if (tid_agg_rx
->timeout
)
758 mod_timer(&tid_agg_rx
->session_timer
,
759 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
761 /* if this mpdu is fragmented - terminate rx aggregation session */
762 sc
= le16_to_cpu(hdr
->seq_ctrl
);
763 if (sc
& IEEE80211_SCTL_FRAG
) {
764 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
765 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
766 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
771 * No locking needed -- we will only ever process one
772 * RX packet at a time, and thus own tid_agg_rx. All
773 * other code manipulating it needs to (and does) make
774 * sure that we cannot get to it any more before doing
777 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
))
781 __skb_queue_tail(frames
, skb
);
784 static ieee80211_rx_result debug_noinline
785 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
787 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
789 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
790 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
791 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
792 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
794 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
795 rx
->local
->dot11FrameDuplicateCount
++;
796 rx
->sta
->num_duplicates
++;
798 return RX_DROP_MONITOR
;
800 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
803 if (unlikely(rx
->skb
->len
< 16)) {
804 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
805 return RX_DROP_MONITOR
;
808 /* Drop disallowed frame classes based on STA auth/assoc state;
809 * IEEE 802.11, Chap 5.5.
811 * mac80211 filters only based on association state, i.e. it drops
812 * Class 3 frames from not associated stations. hostapd sends
813 * deauth/disassoc frames when needed. In addition, hostapd is
814 * responsible for filtering on both auth and assoc states.
817 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
818 return ieee80211_rx_mesh_check(rx
);
820 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
821 ieee80211_is_pspoll(hdr
->frame_control
)) &&
822 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
823 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
824 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
825 !ieee80211_has_tods(hdr
->frame_control
) &&
826 ieee80211_is_data(hdr
->frame_control
)) ||
827 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
828 /* Drop IBSS frames and frames for other hosts
830 return RX_DROP_MONITOR
;
833 return RX_DROP_MONITOR
;
840 static ieee80211_rx_result debug_noinline
841 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
843 struct sk_buff
*skb
= rx
->skb
;
844 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
845 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
848 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
849 struct ieee80211_key
*stakey
= NULL
;
850 int mmie_keyidx
= -1;
856 * There are four types of keys:
858 * - IGTK (group keys for management frames)
859 * - PTK (pairwise keys)
860 * - STK (station-to-station pairwise keys)
862 * When selecting a key, we have to distinguish between multicast
863 * (including broadcast) and unicast frames, the latter can only
864 * use PTKs and STKs while the former always use GTKs and IGTKs.
865 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
866 * unicast frames can also use key indices like GTKs. Hence, if we
867 * don't have a PTK/STK we check the key index for a WEP key.
869 * Note that in a regular BSS, multicast frames are sent by the
870 * AP only, associated stations unicast the frame to the AP first
871 * which then multicasts it on their behalf.
873 * There is also a slight problem in IBSS mode: GTKs are negotiated
874 * with each station, that is something we don't currently handle.
875 * The spec seems to expect that one negotiates the same key with
876 * every station but there's no such requirement; VLANs could be
881 * No point in finding a key and decrypting if the frame is neither
882 * addressed to us nor a multicast frame.
884 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
887 /* start without a key */
891 stakey
= rcu_dereference(rx
->sta
->key
);
893 fc
= hdr
->frame_control
;
895 if (!ieee80211_has_protected(fc
))
896 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
898 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
900 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
901 (status
->flag
& RX_FLAG_IV_STRIPPED
))
903 /* Skip decryption if the frame is not protected. */
904 if (!ieee80211_has_protected(fc
))
906 } else if (mmie_keyidx
>= 0) {
907 /* Broadcast/multicast robust management frame / BIP */
908 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
909 (status
->flag
& RX_FLAG_IV_STRIPPED
))
912 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
913 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
914 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
915 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
916 } else if (!ieee80211_has_protected(fc
)) {
918 * The frame was not protected, so skip decryption. However, we
919 * need to set rx->key if there is a key that could have been
920 * used so that the frame may be dropped if encryption would
921 * have been expected.
923 struct ieee80211_key
*key
= NULL
;
924 if (ieee80211_is_mgmt(fc
) &&
925 is_multicast_ether_addr(hdr
->addr1
) &&
926 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
928 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
934 * The device doesn't give us the IV so we won't be
935 * able to look up the key. That's ok though, we
936 * don't need to decrypt the frame, we just won't
937 * be able to keep statistics accurate.
938 * Except for key threshold notifications, should
939 * we somehow allow the driver to tell us which key
940 * the hardware used if this flag is set?
942 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
943 (status
->flag
& RX_FLAG_IV_STRIPPED
))
946 hdrlen
= ieee80211_hdrlen(fc
);
948 if (rx
->skb
->len
< 8 + hdrlen
)
949 return RX_DROP_UNUSABLE
; /* TODO: count this? */
952 * no need to call ieee80211_wep_get_keyidx,
953 * it verifies a bunch of things we've done already
955 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
958 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
961 * RSNA-protected unicast frames should always be sent with
962 * pairwise or station-to-station keys, but for WEP we allow
963 * using a key index as well.
965 if (rx
->key
&& rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
966 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
967 !is_multicast_ether_addr(hdr
->addr1
))
972 rx
->key
->tx_rx_count
++;
973 /* TODO: add threshold stuff again */
975 return RX_DROP_MONITOR
;
978 if (skb_linearize(rx
->skb
))
979 return RX_DROP_UNUSABLE
;
980 /* the hdr variable is invalid now! */
982 switch (rx
->key
->conf
.cipher
) {
983 case WLAN_CIPHER_SUITE_WEP40
:
984 case WLAN_CIPHER_SUITE_WEP104
:
985 /* Check for weak IVs if possible */
986 if (rx
->sta
&& ieee80211_is_data(fc
) &&
987 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
988 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
989 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
990 rx
->sta
->wep_weak_iv_count
++;
992 result
= ieee80211_crypto_wep_decrypt(rx
);
994 case WLAN_CIPHER_SUITE_TKIP
:
995 result
= ieee80211_crypto_tkip_decrypt(rx
);
997 case WLAN_CIPHER_SUITE_CCMP
:
998 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1000 case WLAN_CIPHER_SUITE_AES_CMAC
:
1001 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1005 * We can reach here only with HW-only algorithms
1006 * but why didn't it decrypt the frame?!
1008 return RX_DROP_UNUSABLE
;
1011 /* either the frame has been decrypted or will be dropped */
1012 status
->flag
|= RX_FLAG_DECRYPTED
;
1017 static ieee80211_rx_result debug_noinline
1018 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1020 struct ieee80211_local
*local
;
1021 struct ieee80211_hdr
*hdr
;
1022 struct sk_buff
*skb
;
1026 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1028 if (!local
->pspolling
)
1031 if (!ieee80211_has_fromds(hdr
->frame_control
))
1032 /* this is not from AP */
1035 if (!ieee80211_is_data(hdr
->frame_control
))
1038 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1039 /* AP has no more frames buffered for us */
1040 local
->pspolling
= false;
1044 /* more data bit is set, let's request a new frame from the AP */
1045 ieee80211_send_pspoll(local
, rx
->sdata
);
1050 static void ap_sta_ps_start(struct sta_info
*sta
)
1052 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1053 struct ieee80211_local
*local
= sdata
->local
;
1055 atomic_inc(&sdata
->bss
->num_sta_ps
);
1056 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1057 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1058 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1059 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1060 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1061 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1064 static void ap_sta_ps_end(struct sta_info
*sta
)
1066 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1068 atomic_dec(&sdata
->bss
->num_sta_ps
);
1070 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
1072 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1073 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1074 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1075 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1077 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1078 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1079 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1080 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1081 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1085 ieee80211_sta_ps_deliver_wakeup(sta
);
1088 static ieee80211_rx_result debug_noinline
1089 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1091 struct sta_info
*sta
= rx
->sta
;
1092 struct sk_buff
*skb
= rx
->skb
;
1093 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1094 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1100 * Update last_rx only for IBSS packets which are for the current
1101 * BSSID to avoid keeping the current IBSS network alive in cases
1102 * where other STAs start using different BSSID.
1104 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1105 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1106 NL80211_IFTYPE_ADHOC
);
1107 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1108 sta
->last_rx
= jiffies
;
1109 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1111 * Mesh beacons will update last_rx when if they are found to
1112 * match the current local configuration when processed.
1114 sta
->last_rx
= jiffies
;
1117 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1120 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1121 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1123 sta
->rx_fragments
++;
1124 sta
->rx_bytes
+= rx
->skb
->len
;
1125 sta
->last_signal
= status
->signal
;
1128 * Change STA power saving mode only at the end of a frame
1129 * exchange sequence.
1131 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1132 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1133 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1134 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1136 * Ignore doze->wake transitions that are
1137 * indicated by non-data frames, the standard
1138 * is unclear here, but for example going to
1139 * PS mode and then scanning would cause a
1140 * doze->wake transition for the probe request,
1141 * and that is clearly undesirable.
1143 if (ieee80211_is_data(hdr
->frame_control
) &&
1144 !ieee80211_has_pm(hdr
->frame_control
))
1147 if (ieee80211_has_pm(hdr
->frame_control
))
1148 ap_sta_ps_start(sta
);
1153 * Drop (qos-)data::nullfunc frames silently, since they
1154 * are used only to control station power saving mode.
1156 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1157 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1158 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1161 * If we receive a 4-addr nullfunc frame from a STA
1162 * that was not moved to a 4-addr STA vlan yet, drop
1163 * the frame to the monitor interface, to make sure
1164 * that hostapd sees it
1166 if (ieee80211_has_a4(hdr
->frame_control
) &&
1167 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1168 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1169 !rx
->sdata
->u
.vlan
.sta
)))
1170 return RX_DROP_MONITOR
;
1172 * Update counter and free packet here to avoid
1173 * counting this as a dropped packed.
1176 dev_kfree_skb(rx
->skb
);
1181 } /* ieee80211_rx_h_sta_process */
1183 static inline struct ieee80211_fragment_entry
*
1184 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1185 unsigned int frag
, unsigned int seq
, int rx_queue
,
1186 struct sk_buff
**skb
)
1188 struct ieee80211_fragment_entry
*entry
;
1191 idx
= sdata
->fragment_next
;
1192 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1193 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1194 sdata
->fragment_next
= 0;
1196 if (!skb_queue_empty(&entry
->skb_list
)) {
1197 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1198 struct ieee80211_hdr
*hdr
=
1199 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1200 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1201 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1202 "addr1=%pM addr2=%pM\n",
1204 jiffies
- entry
->first_frag_time
, entry
->seq
,
1205 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1207 __skb_queue_purge(&entry
->skb_list
);
1210 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1212 entry
->first_frag_time
= jiffies
;
1214 entry
->rx_queue
= rx_queue
;
1215 entry
->last_frag
= frag
;
1217 entry
->extra_len
= 0;
1222 static inline struct ieee80211_fragment_entry
*
1223 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1224 unsigned int frag
, unsigned int seq
,
1225 int rx_queue
, struct ieee80211_hdr
*hdr
)
1227 struct ieee80211_fragment_entry
*entry
;
1230 idx
= sdata
->fragment_next
;
1231 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1232 struct ieee80211_hdr
*f_hdr
;
1236 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1238 entry
= &sdata
->fragments
[idx
];
1239 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1240 entry
->rx_queue
!= rx_queue
||
1241 entry
->last_frag
+ 1 != frag
)
1244 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1247 * Check ftype and addresses are equal, else check next fragment
1249 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1250 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1251 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1252 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1255 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1256 __skb_queue_purge(&entry
->skb_list
);
1265 static ieee80211_rx_result debug_noinline
1266 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1268 struct ieee80211_hdr
*hdr
;
1271 unsigned int frag
, seq
;
1272 struct ieee80211_fragment_entry
*entry
;
1273 struct sk_buff
*skb
;
1275 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1276 fc
= hdr
->frame_control
;
1277 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1278 frag
= sc
& IEEE80211_SCTL_FRAG
;
1280 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1281 (rx
->skb
)->len
< 24 ||
1282 is_multicast_ether_addr(hdr
->addr1
))) {
1283 /* not fragmented */
1286 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1288 if (skb_linearize(rx
->skb
))
1289 return RX_DROP_UNUSABLE
;
1292 * skb_linearize() might change the skb->data and
1293 * previously cached variables (in this case, hdr) need to
1294 * be refreshed with the new data.
1296 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1297 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1300 /* This is the first fragment of a new frame. */
1301 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1302 rx
->queue
, &(rx
->skb
));
1303 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1304 ieee80211_has_protected(fc
)) {
1305 int queue
= ieee80211_is_mgmt(fc
) ?
1306 NUM_RX_DATA_QUEUES
: rx
->queue
;
1307 /* Store CCMP PN so that we can verify that the next
1308 * fragment has a sequential PN value. */
1310 memcpy(entry
->last_pn
,
1311 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1317 /* This is a fragment for a frame that should already be pending in
1318 * fragment cache. Add this fragment to the end of the pending entry.
1320 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1322 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1323 return RX_DROP_MONITOR
;
1326 /* Verify that MPDUs within one MSDU have sequential PN values.
1327 * (IEEE 802.11i, 8.3.3.4.5) */
1330 u8 pn
[CCMP_PN_LEN
], *rpn
;
1332 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1333 return RX_DROP_UNUSABLE
;
1334 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1335 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1340 queue
= ieee80211_is_mgmt(fc
) ?
1341 NUM_RX_DATA_QUEUES
: rx
->queue
;
1342 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1343 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1344 return RX_DROP_UNUSABLE
;
1345 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1348 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1349 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1350 entry
->last_frag
= frag
;
1351 entry
->extra_len
+= rx
->skb
->len
;
1352 if (ieee80211_has_morefrags(fc
)) {
1357 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1358 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1359 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1360 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1362 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1363 __skb_queue_purge(&entry
->skb_list
);
1364 return RX_DROP_UNUSABLE
;
1367 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1368 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1372 /* Complete frame has been reassembled - process it now */
1373 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1377 rx
->sta
->rx_packets
++;
1378 if (is_multicast_ether_addr(hdr
->addr1
))
1379 rx
->local
->dot11MulticastReceivedFrameCount
++;
1381 ieee80211_led_rx(rx
->local
);
1385 static ieee80211_rx_result debug_noinline
1386 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1388 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1389 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1391 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1392 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1395 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1396 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1397 return RX_DROP_UNUSABLE
;
1399 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1400 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1402 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1404 /* Free PS Poll skb here instead of returning RX_DROP that would
1405 * count as an dropped frame. */
1406 dev_kfree_skb(rx
->skb
);
1411 static ieee80211_rx_result debug_noinline
1412 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1414 u8
*data
= rx
->skb
->data
;
1415 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1417 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1420 /* remove the qos control field, update frame type and meta-data */
1421 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1422 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1423 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1424 /* change frame type to non QOS */
1425 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1431 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1433 if (unlikely(!rx
->sta
||
1434 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1441 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1443 struct sk_buff
*skb
= rx
->skb
;
1444 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1447 * Pass through unencrypted frames if the hardware has
1448 * decrypted them already.
1450 if (status
->flag
& RX_FLAG_DECRYPTED
)
1453 /* Drop unencrypted frames if key is set. */
1454 if (unlikely(!ieee80211_has_protected(fc
) &&
1455 !ieee80211_is_nullfunc(fc
) &&
1456 ieee80211_is_data(fc
) &&
1457 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1464 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1466 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1467 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1468 __le16 fc
= hdr
->frame_control
;
1471 * Pass through unencrypted frames if the hardware has
1472 * decrypted them already.
1474 if (status
->flag
& RX_FLAG_DECRYPTED
)
1477 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1478 if (unlikely(!ieee80211_has_protected(fc
) &&
1479 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1482 /* BIP does not use Protected field, so need to check MMIE */
1483 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1484 ieee80211_get_mmie_keyidx(rx
->skb
) < 0))
1487 * When using MFP, Action frames are not allowed prior to
1488 * having configured keys.
1490 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1491 ieee80211_is_robust_mgmt_frame(
1492 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1500 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1502 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1503 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1505 if (ieee80211_has_a4(hdr
->frame_control
) &&
1506 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1509 if (is_multicast_ether_addr(hdr
->addr1
) &&
1510 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1511 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1514 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1518 * requires that rx->skb is a frame with ethernet header
1520 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1522 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1523 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1524 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1527 * Allow EAPOL frames to us/the PAE group address regardless
1528 * of whether the frame was encrypted or not.
1530 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1531 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1532 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1535 if (ieee80211_802_1x_port_control(rx
) ||
1536 ieee80211_drop_unencrypted(rx
, fc
))
1543 * requires that rx->skb is a frame with ethernet header
1546 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1548 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1549 struct net_device
*dev
= sdata
->dev
;
1550 struct sk_buff
*skb
, *xmit_skb
;
1551 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1552 struct sta_info
*dsta
;
1557 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1558 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1559 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1560 (rx
->flags
& IEEE80211_RX_RA_MATCH
) &&
1561 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1562 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1564 * send multicast frames both to higher layers in
1565 * local net stack and back to the wireless medium
1567 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1568 if (!xmit_skb
&& net_ratelimit())
1569 printk(KERN_DEBUG
"%s: failed to clone "
1570 "multicast frame\n", dev
->name
);
1572 dsta
= sta_info_get(sdata
, skb
->data
);
1575 * The destination station is associated to
1576 * this AP (in this VLAN), so send the frame
1577 * directly to it and do not pass it to local
1587 int align __maybe_unused
;
1589 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1591 * 'align' will only take the values 0 or 2 here
1592 * since all frames are required to be aligned
1593 * to 2-byte boundaries when being passed to
1594 * mac80211. That also explains the __skb_push()
1597 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1599 if (WARN_ON(skb_headroom(skb
) < 3)) {
1603 u8
*data
= skb
->data
;
1604 size_t len
= skb_headlen(skb
);
1606 memmove(skb
->data
, data
, len
);
1607 skb_set_tail_pointer(skb
, len
);
1613 /* deliver to local stack */
1614 skb
->protocol
= eth_type_trans(skb
, dev
);
1615 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1616 netif_receive_skb(skb
);
1621 /* send to wireless media */
1622 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1623 skb_reset_network_header(xmit_skb
);
1624 skb_reset_mac_header(xmit_skb
);
1625 dev_queue_xmit(xmit_skb
);
1629 static ieee80211_rx_result debug_noinline
1630 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1632 struct net_device
*dev
= rx
->sdata
->dev
;
1633 struct sk_buff
*skb
= rx
->skb
;
1634 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1635 __le16 fc
= hdr
->frame_control
;
1636 struct sk_buff_head frame_list
;
1638 if (unlikely(!ieee80211_is_data(fc
)))
1641 if (unlikely(!ieee80211_is_data_present(fc
)))
1642 return RX_DROP_MONITOR
;
1644 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1647 if (ieee80211_has_a4(hdr
->frame_control
) &&
1648 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1649 !rx
->sdata
->u
.vlan
.sta
)
1650 return RX_DROP_UNUSABLE
;
1652 if (is_multicast_ether_addr(hdr
->addr1
) &&
1653 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1654 rx
->sdata
->u
.vlan
.sta
) ||
1655 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1656 rx
->sdata
->u
.mgd
.use_4addr
)))
1657 return RX_DROP_UNUSABLE
;
1660 __skb_queue_head_init(&frame_list
);
1662 if (skb_linearize(skb
))
1663 return RX_DROP_UNUSABLE
;
1665 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1666 rx
->sdata
->vif
.type
,
1667 rx
->local
->hw
.extra_tx_headroom
);
1669 while (!skb_queue_empty(&frame_list
)) {
1670 rx
->skb
= __skb_dequeue(&frame_list
);
1672 if (!ieee80211_frame_allowed(rx
, fc
)) {
1673 dev_kfree_skb(rx
->skb
);
1676 dev
->stats
.rx_packets
++;
1677 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1679 ieee80211_deliver_skb(rx
);
1685 #ifdef CONFIG_MAC80211_MESH
1686 static ieee80211_rx_result
1687 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1689 struct ieee80211_hdr
*hdr
;
1690 struct ieee80211s_hdr
*mesh_hdr
;
1691 unsigned int hdrlen
;
1692 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1693 struct ieee80211_local
*local
= rx
->local
;
1694 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1696 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1697 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1698 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1700 if (!ieee80211_is_data(hdr
->frame_control
))
1705 return RX_DROP_MONITOR
;
1707 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1708 struct mesh_path
*mppath
;
1712 if (is_multicast_ether_addr(hdr
->addr1
)) {
1713 mpp_addr
= hdr
->addr3
;
1714 proxied_addr
= mesh_hdr
->eaddr1
;
1716 mpp_addr
= hdr
->addr4
;
1717 proxied_addr
= mesh_hdr
->eaddr2
;
1721 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1723 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1725 spin_lock_bh(&mppath
->state_lock
);
1726 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1727 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1728 spin_unlock_bh(&mppath
->state_lock
);
1733 /* Frame has reached destination. Don't forward */
1734 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1735 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1740 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1742 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1743 dropped_frames_ttl
);
1745 struct ieee80211_hdr
*fwd_hdr
;
1746 struct ieee80211_tx_info
*info
;
1748 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1750 if (!fwd_skb
&& net_ratelimit())
1751 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1754 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1755 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1756 info
= IEEE80211_SKB_CB(fwd_skb
);
1757 memset(info
, 0, sizeof(*info
));
1758 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1759 info
->control
.vif
= &rx
->sdata
->vif
;
1760 skb_set_queue_mapping(skb
,
1761 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1762 ieee80211_set_qos_hdr(local
, skb
);
1763 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1764 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1769 * Save TA to addr1 to send TA a path error if a
1770 * suitable next hop is not found
1772 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1774 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1775 /* Failed to immediately resolve next hop:
1776 * fwded frame was dropped or will be added
1777 * later to the pending skb queue. */
1779 return RX_DROP_MONITOR
;
1781 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1784 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1786 ieee80211_add_pending_skb(local
, fwd_skb
);
1790 if (is_multicast_ether_addr(hdr
->addr1
) ||
1791 sdata
->dev
->flags
& IFF_PROMISC
)
1794 return RX_DROP_MONITOR
;
1798 static ieee80211_rx_result debug_noinline
1799 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1801 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1802 struct ieee80211_local
*local
= rx
->local
;
1803 struct net_device
*dev
= sdata
->dev
;
1804 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1805 __le16 fc
= hdr
->frame_control
;
1808 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1811 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1812 return RX_DROP_MONITOR
;
1815 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1816 * that a 4-addr station can be detected and moved into a separate VLAN
1818 if (ieee80211_has_a4(hdr
->frame_control
) &&
1819 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1820 return RX_DROP_MONITOR
;
1822 err
= __ieee80211_data_to_8023(rx
);
1824 return RX_DROP_UNUSABLE
;
1826 if (!ieee80211_frame_allowed(rx
, fc
))
1827 return RX_DROP_MONITOR
;
1831 dev
->stats
.rx_packets
++;
1832 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1834 if (ieee80211_is_data(hdr
->frame_control
) &&
1835 !is_multicast_ether_addr(hdr
->addr1
) &&
1836 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1837 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1838 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1841 ieee80211_deliver_skb(rx
);
1846 static ieee80211_rx_result debug_noinline
1847 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1849 struct ieee80211_local
*local
= rx
->local
;
1850 struct ieee80211_hw
*hw
= &local
->hw
;
1851 struct sk_buff
*skb
= rx
->skb
;
1852 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1853 struct tid_ampdu_rx
*tid_agg_rx
;
1857 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1860 if (ieee80211_is_back_req(bar
->frame_control
)) {
1862 __le16 control
, start_seq_num
;
1863 } __packed bar_data
;
1866 return RX_DROP_MONITOR
;
1868 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
1869 &bar_data
, sizeof(bar_data
)))
1870 return RX_DROP_MONITOR
;
1872 tid
= le16_to_cpu(bar_data
.control
) >> 12;
1874 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
1876 return RX_DROP_MONITOR
;
1878 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
1880 /* reset session timer */
1881 if (tid_agg_rx
->timeout
)
1882 mod_timer(&tid_agg_rx
->session_timer
,
1883 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1885 /* release stored frames up to start of BAR */
1886 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1893 * After this point, we only want management frames,
1894 * so we can drop all remaining control frames to
1895 * cooked monitor interfaces.
1897 return RX_DROP_MONITOR
;
1900 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1901 struct ieee80211_mgmt
*mgmt
,
1904 struct ieee80211_local
*local
= sdata
->local
;
1905 struct sk_buff
*skb
;
1906 struct ieee80211_mgmt
*resp
;
1908 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1909 /* Not to own unicast address */
1913 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1914 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1915 /* Not from the current AP or not associated yet. */
1919 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1920 /* Too short SA Query request frame */
1924 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1928 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1929 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1930 memset(resp
, 0, 24);
1931 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1932 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
1933 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1934 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1935 IEEE80211_STYPE_ACTION
);
1936 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1937 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1938 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1939 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1940 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1941 WLAN_SA_QUERY_TR_ID_LEN
);
1943 ieee80211_tx_skb(sdata
, skb
);
1946 static ieee80211_rx_result debug_noinline
1947 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
1949 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1952 * From here on, look only at management frames.
1953 * Data and control frames are already handled,
1954 * and unknown (reserved) frames are useless.
1956 if (rx
->skb
->len
< 24)
1957 return RX_DROP_MONITOR
;
1959 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
1960 return RX_DROP_MONITOR
;
1962 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1963 return RX_DROP_MONITOR
;
1965 if (ieee80211_drop_unencrypted_mgmt(rx
))
1966 return RX_DROP_UNUSABLE
;
1971 static ieee80211_rx_result debug_noinline
1972 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1974 struct ieee80211_local
*local
= rx
->local
;
1975 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1976 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1977 int len
= rx
->skb
->len
;
1979 if (!ieee80211_is_action(mgmt
->frame_control
))
1982 /* drop too small frames */
1983 if (len
< IEEE80211_MIN_ACTION_SIZE
)
1984 return RX_DROP_UNUSABLE
;
1986 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
1987 return RX_DROP_UNUSABLE
;
1989 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1990 return RX_DROP_UNUSABLE
;
1992 switch (mgmt
->u
.action
.category
) {
1993 case WLAN_CATEGORY_BACK
:
1995 * The aggregation code is not prepared to handle
1996 * anything but STA/AP due to the BSSID handling;
1997 * IBSS could work in the code but isn't supported
1998 * by drivers or the standard.
2000 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2001 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2002 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2005 /* verify action_code is present */
2006 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2009 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2010 case WLAN_ACTION_ADDBA_REQ
:
2011 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2012 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2015 case WLAN_ACTION_ADDBA_RESP
:
2016 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2017 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2020 case WLAN_ACTION_DELBA
:
2021 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2022 sizeof(mgmt
->u
.action
.u
.delba
)))
2030 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2031 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2034 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2037 /* verify action_code is present */
2038 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2041 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2042 case WLAN_ACTION_SPCT_MSR_REQ
:
2043 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2044 sizeof(mgmt
->u
.action
.u
.measurement
)))
2046 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2048 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2049 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2050 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2053 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2056 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2062 case WLAN_CATEGORY_SA_QUERY
:
2063 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2064 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2067 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2068 case WLAN_ACTION_SA_QUERY_REQUEST
:
2069 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2071 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2075 case WLAN_CATEGORY_MESH_PLINK
:
2076 case WLAN_CATEGORY_MESH_PATH_SEL
:
2077 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2085 rx
->flags
|= IEEE80211_MALFORMED_ACTION_FRM
;
2086 /* will return in the next handlers */
2091 rx
->sta
->rx_packets
++;
2092 dev_kfree_skb(rx
->skb
);
2096 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2097 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2098 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2100 rx
->sta
->rx_packets
++;
2104 static ieee80211_rx_result debug_noinline
2105 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2107 struct ieee80211_rx_status
*status
;
2109 /* skip known-bad action frames and return them in the next handler */
2110 if (rx
->flags
& IEEE80211_MALFORMED_ACTION_FRM
)
2114 * Getting here means the kernel doesn't know how to handle
2115 * it, but maybe userspace does ... include returned frames
2116 * so userspace can register for those to know whether ones
2117 * it transmitted were processed or returned.
2119 status
= IEEE80211_SKB_RXCB(rx
->skb
);
2121 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2122 rx
->skb
->data
, rx
->skb
->len
,
2125 rx
->sta
->rx_packets
++;
2126 dev_kfree_skb(rx
->skb
);
2134 static ieee80211_rx_result debug_noinline
2135 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2137 struct ieee80211_local
*local
= rx
->local
;
2138 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2139 struct sk_buff
*nskb
;
2140 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2142 if (!ieee80211_is_action(mgmt
->frame_control
))
2146 * For AP mode, hostapd is responsible for handling any action
2147 * frames that we didn't handle, including returning unknown
2148 * ones. For all other modes we will return them to the sender,
2149 * setting the 0x80 bit in the action category, as required by
2150 * 802.11-2007 7.3.1.11.
2151 * Newer versions of hostapd shall also use the management frame
2152 * registration mechanisms, but older ones still use cooked
2153 * monitor interfaces so push all frames there.
2155 if (!(rx
->flags
& IEEE80211_MALFORMED_ACTION_FRM
) &&
2156 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2157 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2158 return RX_DROP_MONITOR
;
2160 /* do not return rejected action frames */
2161 if (mgmt
->u
.action
.category
& 0x80)
2162 return RX_DROP_UNUSABLE
;
2164 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2167 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2169 nmgmt
->u
.action
.category
|= 0x80;
2170 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2171 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2173 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2175 ieee80211_tx_skb(rx
->sdata
, nskb
);
2177 dev_kfree_skb(rx
->skb
);
2181 static ieee80211_rx_result debug_noinline
2182 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2184 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2185 ieee80211_rx_result rxs
;
2186 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2189 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2190 if (rxs
!= RX_CONTINUE
)
2193 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2195 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2196 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2197 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2198 return RX_DROP_MONITOR
;
2201 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2202 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2203 /* process for all: mesh, mlme, ibss */
2205 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2206 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2207 /* process only for station */
2208 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2209 return RX_DROP_MONITOR
;
2211 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2212 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2213 /* process only for ibss */
2214 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2215 return RX_DROP_MONITOR
;
2218 return RX_DROP_MONITOR
;
2221 /* queue up frame and kick off work to process it */
2222 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2223 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2224 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2226 rx
->sta
->rx_packets
++;
2231 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2232 struct ieee80211_rx_data
*rx
)
2235 unsigned int hdrlen
;
2237 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2238 if (rx
->skb
->len
>= hdrlen
+ 4)
2239 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2245 * Some hardware seem to generate incorrect Michael MIC
2246 * reports; ignore them to avoid triggering countermeasures.
2251 if (!ieee80211_has_protected(hdr
->frame_control
))
2254 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2256 * APs with pairwise keys should never receive Michael MIC
2257 * errors for non-zero keyidx because these are reserved for
2258 * group keys and only the AP is sending real multicast
2259 * frames in the BSS.
2264 if (!ieee80211_is_data(hdr
->frame_control
) &&
2265 !ieee80211_is_auth(hdr
->frame_control
))
2268 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2272 /* TODO: use IEEE80211_RX_FRAGMENTED */
2273 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2274 struct ieee80211_rate
*rate
)
2276 struct ieee80211_sub_if_data
*sdata
;
2277 struct ieee80211_local
*local
= rx
->local
;
2278 struct ieee80211_rtap_hdr
{
2279 struct ieee80211_radiotap_header hdr
;
2285 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2286 struct net_device
*prev_dev
= NULL
;
2287 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2289 if (status
->flag
& RX_FLAG_INTERNAL_CMTR
)
2292 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2293 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2296 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2297 memset(rthdr
, 0, sizeof(*rthdr
));
2298 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2299 rthdr
->hdr
.it_present
=
2300 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2301 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2304 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2305 rthdr
->hdr
.it_present
|=
2306 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2308 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2310 if (status
->band
== IEEE80211_BAND_5GHZ
)
2311 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2312 IEEE80211_CHAN_5GHZ
);
2314 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2315 IEEE80211_CHAN_2GHZ
);
2317 skb_set_mac_header(skb
, 0);
2318 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2319 skb
->pkt_type
= PACKET_OTHERHOST
;
2320 skb
->protocol
= htons(ETH_P_802_2
);
2322 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2323 if (!ieee80211_sdata_running(sdata
))
2326 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2327 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2331 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2333 skb2
->dev
= prev_dev
;
2334 netif_receive_skb(skb2
);
2338 prev_dev
= sdata
->dev
;
2339 sdata
->dev
->stats
.rx_packets
++;
2340 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2344 skb
->dev
= prev_dev
;
2345 netif_receive_skb(skb
);
2350 status
->flag
|= RX_FLAG_INTERNAL_CMTR
;
2357 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2358 ieee80211_rx_result res
)
2361 case RX_DROP_MONITOR
:
2362 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2364 rx
->sta
->rx_dropped
++;
2367 struct ieee80211_rate
*rate
= NULL
;
2368 struct ieee80211_supported_band
*sband
;
2369 struct ieee80211_rx_status
*status
;
2371 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2373 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2374 if (!(status
->flag
& RX_FLAG_HT
))
2375 rate
= &sband
->bitrates
[status
->rate_idx
];
2377 ieee80211_rx_cooked_monitor(rx
, rate
);
2380 case RX_DROP_UNUSABLE
:
2381 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2383 rx
->sta
->rx_dropped
++;
2384 dev_kfree_skb(rx
->skb
);
2387 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2392 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2393 struct sk_buff_head
*frames
)
2395 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2396 struct sk_buff
*skb
;
2398 #define CALL_RXH(rxh) \
2401 if (res != RX_CONTINUE) \
2405 while ((skb
= __skb_dequeue(frames
))) {
2407 * all the other fields are valid across frames
2408 * that belong to an aMPDU since they are on the
2409 * same TID from the same station
2413 CALL_RXH(ieee80211_rx_h_decrypt
)
2414 CALL_RXH(ieee80211_rx_h_check_more_data
)
2415 CALL_RXH(ieee80211_rx_h_sta_process
)
2416 CALL_RXH(ieee80211_rx_h_defragment
)
2417 CALL_RXH(ieee80211_rx_h_ps_poll
)
2418 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2419 /* must be after MMIC verify so header is counted in MPDU mic */
2420 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2421 CALL_RXH(ieee80211_rx_h_amsdu
)
2422 #ifdef CONFIG_MAC80211_MESH
2423 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2424 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2426 CALL_RXH(ieee80211_rx_h_data
)
2428 /* special treatment -- needs the queue */
2429 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2430 if (res
!= RX_CONTINUE
)
2433 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2434 CALL_RXH(ieee80211_rx_h_action
)
2435 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2436 CALL_RXH(ieee80211_rx_h_action_return
)
2437 CALL_RXH(ieee80211_rx_h_mgmt
)
2440 ieee80211_rx_handlers_result(rx
, res
);
2446 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2447 struct ieee80211_rx_data
*rx
,
2448 struct sk_buff
*skb
)
2450 struct sk_buff_head reorder_release
;
2451 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2453 __skb_queue_head_init(&reorder_release
);
2458 #define CALL_RXH(rxh) \
2461 if (res != RX_CONTINUE) \
2465 CALL_RXH(ieee80211_rx_h_passive_scan
)
2466 CALL_RXH(ieee80211_rx_h_check
)
2468 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2470 ieee80211_rx_handlers(rx
, &reorder_release
);
2474 ieee80211_rx_handlers_result(rx
, res
);
2480 * This function makes calls into the RX path. Therefore the
2481 * caller must hold the sta_info->lock and everything has to
2482 * be under rcu_read_lock protection as well.
2484 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2486 struct sk_buff_head frames
;
2487 struct ieee80211_rx_data rx
= { };
2488 struct tid_ampdu_rx
*tid_agg_rx
;
2490 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2494 __skb_queue_head_init(&frames
);
2496 /* construct rx struct */
2498 rx
.sdata
= sta
->sdata
;
2499 rx
.local
= sta
->local
;
2501 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2503 if (unlikely(test_bit(SCAN_HW_SCANNING
, &sta
->local
->scanning
) ||
2504 test_bit(SCAN_OFF_CHANNEL
, &sta
->local
->scanning
)))
2505 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2507 spin_lock(&tid_agg_rx
->reorder_lock
);
2508 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
, &frames
);
2509 spin_unlock(&tid_agg_rx
->reorder_lock
);
2511 ieee80211_rx_handlers(&rx
, &frames
);
2514 /* main receive path */
2516 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2517 struct ieee80211_rx_data
*rx
,
2518 struct ieee80211_hdr
*hdr
)
2520 struct sk_buff
*skb
= rx
->skb
;
2521 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2522 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2523 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2525 switch (sdata
->vif
.type
) {
2526 case NL80211_IFTYPE_STATION
:
2527 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2530 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2531 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2533 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2536 case NL80211_IFTYPE_ADHOC
:
2539 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2542 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2543 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2545 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2546 } else if (!multicast
&&
2547 compare_ether_addr(sdata
->vif
.addr
,
2549 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2551 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2552 } else if (!rx
->sta
) {
2554 if (status
->flag
& RX_FLAG_HT
)
2555 rate_idx
= 0; /* TODO: HT rates */
2557 rate_idx
= status
->rate_idx
;
2558 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2559 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2562 case NL80211_IFTYPE_MESH_POINT
:
2564 compare_ether_addr(sdata
->vif
.addr
,
2566 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2569 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2572 case NL80211_IFTYPE_AP_VLAN
:
2573 case NL80211_IFTYPE_AP
:
2575 if (compare_ether_addr(sdata
->vif
.addr
,
2578 } else if (!ieee80211_bssid_match(bssid
,
2580 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2582 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2585 case NL80211_IFTYPE_WDS
:
2586 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2588 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2591 case NL80211_IFTYPE_MONITOR
:
2592 case NL80211_IFTYPE_UNSPECIFIED
:
2593 case NUM_NL80211_IFTYPES
:
2594 /* should never get here */
2603 * This is the actual Rx frames handler. as it blongs to Rx path it must
2604 * be called with rcu_read_lock protection.
2606 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2607 struct sk_buff
*skb
)
2609 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2610 struct ieee80211_local
*local
= hw_to_local(hw
);
2611 struct ieee80211_sub_if_data
*sdata
;
2612 struct ieee80211_hdr
*hdr
;
2614 struct ieee80211_rx_data rx
;
2616 struct ieee80211_sub_if_data
*prev
= NULL
;
2617 struct sk_buff
*skb_new
;
2618 struct sta_info
*sta
, *tmp
;
2619 bool found_sta
= false;
2622 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2623 memset(&rx
, 0, sizeof(rx
));
2627 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2628 local
->dot11ReceivedFragmentCount
++;
2630 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2631 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2632 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2634 if (ieee80211_is_mgmt(fc
))
2635 err
= skb_linearize(skb
);
2637 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2644 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2645 ieee80211_parse_qos(&rx
);
2646 ieee80211_verify_alignment(&rx
);
2648 if (ieee80211_is_data(fc
)) {
2649 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2652 rx
.sdata
= sta
->sdata
;
2654 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2655 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2657 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2658 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2659 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2666 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2667 if (!ieee80211_sdata_running(sdata
))
2670 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2671 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2675 * frame is destined for this interface, but if it's
2676 * not also for the previous one we handle that after
2677 * the loop to avoid copying the SKB once too much
2685 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2687 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2688 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2693 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2695 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2696 ieee80211_rx_michael_mic_report(hdr
,
2702 * frame was destined for the previous interface
2703 * so invoke RX handlers for it
2706 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2708 if (net_ratelimit())
2709 wiphy_debug(local
->hw
.wiphy
,
2710 "failed to copy multicast frame for %s\n",
2714 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
2720 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2722 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2723 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2730 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
2736 * This is the receive path handler. It is called by a low level driver when an
2737 * 802.11 MPDU is received from the hardware.
2739 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2741 struct ieee80211_local
*local
= hw_to_local(hw
);
2742 struct ieee80211_rate
*rate
= NULL
;
2743 struct ieee80211_supported_band
*sband
;
2744 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2746 WARN_ON_ONCE(softirq_count() == 0);
2748 if (WARN_ON(status
->band
< 0 ||
2749 status
->band
>= IEEE80211_NUM_BANDS
))
2752 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2753 if (WARN_ON(!sband
))
2757 * If we're suspending, it is possible although not too likely
2758 * that we'd be receiving frames after having already partially
2759 * quiesced the stack. We can't process such frames then since
2760 * that might, for example, cause stations to be added or other
2761 * driver callbacks be invoked.
2763 if (unlikely(local
->quiescing
|| local
->suspended
))
2767 * The same happens when we're not even started,
2768 * but that's worth a warning.
2770 if (WARN_ON(!local
->started
))
2773 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2775 * Validate the rate, unless a PLCP error means that
2776 * we probably can't have a valid rate here anyway.
2779 if (status
->flag
& RX_FLAG_HT
) {
2781 * rate_idx is MCS index, which can be [0-76]
2784 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2786 * Anything else would be some sort of driver or
2787 * hardware error. The driver should catch hardware
2790 if (WARN((status
->rate_idx
< 0 ||
2791 status
->rate_idx
> 76),
2792 "Rate marked as an HT rate but passed "
2793 "status->rate_idx is not "
2794 "an MCS index [0-76]: %d (0x%02x)\n",
2799 if (WARN_ON(status
->rate_idx
< 0 ||
2800 status
->rate_idx
>= sband
->n_bitrates
))
2802 rate
= &sband
->bitrates
[status
->rate_idx
];
2807 * key references and virtual interfaces are protected using RCU
2808 * and this requires that we are in a read-side RCU section during
2809 * receive processing
2814 * Frames with failed FCS/PLCP checksum are not returned,
2815 * all other frames are returned without radiotap header
2816 * if it was previously present.
2817 * Also, frames with less than 16 bytes are dropped.
2819 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2825 __ieee80211_rx_handle_packet(hw
, skb
);
2833 EXPORT_SYMBOL(ieee80211_rx
);
2835 /* This is a version of the rx handler that can be called from hard irq
2836 * context. Post the skb on the queue and schedule the tasklet */
2837 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2839 struct ieee80211_local
*local
= hw_to_local(hw
);
2841 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2843 skb
->pkt_type
= IEEE80211_RX_MSG
;
2844 skb_queue_tail(&local
->skb_queue
, skb
);
2845 tasklet_schedule(&local
->tasklet
);
2847 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);