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 skb_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
)
84 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
87 if (len
& 1) /* padding for RX_FLAGS if necessary */
94 * ieee80211_add_rx_radiotap_header - add radiotap header
96 * add a radiotap header containing all the fields which the hardware provided.
99 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
101 struct ieee80211_rate
*rate
,
104 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
105 struct ieee80211_radiotap_header
*rthdr
;
109 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
110 memset(rthdr
, 0, rtap_len
);
112 /* radiotap header, set always present flags */
114 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
115 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
116 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
117 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
118 rthdr
->it_len
= cpu_to_le16(rtap_len
);
120 pos
= (unsigned char *)(rthdr
+1);
122 /* the order of the following fields is important */
124 /* IEEE80211_RADIOTAP_TSFT */
125 if (status
->flag
& RX_FLAG_TSFT
) {
126 put_unaligned_le64(status
->mactime
, pos
);
128 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
132 /* IEEE80211_RADIOTAP_FLAGS */
133 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
134 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
135 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
136 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
137 if (status
->flag
& RX_FLAG_SHORTPRE
)
138 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
141 /* IEEE80211_RADIOTAP_RATE */
142 if (status
->flag
& RX_FLAG_HT
) {
144 * TODO: add following information into radiotap header once
145 * suitable fields are defined for it:
146 * - MCS index (status->rate_idx)
147 * - HT40 (status->flag & RX_FLAG_40MHZ)
148 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
152 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
153 *pos
= rate
->bitrate
/ 5;
157 /* IEEE80211_RADIOTAP_CHANNEL */
158 put_unaligned_le16(status
->freq
, pos
);
160 if (status
->band
== IEEE80211_BAND_5GHZ
)
161 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
163 else if (status
->flag
& RX_FLAG_HT
)
164 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
166 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
167 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
170 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
176 *pos
= status
->signal
;
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
182 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
183 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
184 *pos
= status
->noise
;
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
190 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
192 /* IEEE80211_RADIOTAP_ANTENNA */
193 *pos
= status
->antenna
;
196 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
198 /* IEEE80211_RADIOTAP_RX_FLAGS */
199 /* ensure 2 byte alignment for the 2 byte field as required */
200 if ((pos
- (u8
*)rthdr
) & 1)
202 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
203 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
204 put_unaligned_le16(rx_flags
, pos
);
209 * This function copies a received frame to all monitor interfaces and
210 * returns a cleaned-up SKB that no longer includes the FCS nor the
211 * radiotap header the driver might have added.
213 static struct sk_buff
*
214 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
215 struct ieee80211_rate
*rate
)
217 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
218 struct ieee80211_sub_if_data
*sdata
;
219 int needed_headroom
= 0;
220 struct sk_buff
*skb
, *skb2
;
221 struct net_device
*prev_dev
= NULL
;
222 int present_fcs_len
= 0;
225 * First, we may need to make a copy of the skb because
226 * (1) we need to modify it for radiotap (if not present), and
227 * (2) the other RX handlers will modify the skb we got.
229 * We don't need to, of course, if we aren't going to return
230 * the SKB because it has a bad FCS/PLCP checksum.
233 /* room for the radiotap header based on driver features */
234 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
236 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
237 present_fcs_len
= FCS_LEN
;
239 if (!local
->monitors
) {
240 if (should_drop_frame(origskb
, present_fcs_len
)) {
241 dev_kfree_skb(origskb
);
245 return remove_monitor_info(local
, origskb
);
248 if (should_drop_frame(origskb
, present_fcs_len
)) {
249 /* only need to expand headroom if necessary */
254 * This shouldn't trigger often because most devices have an
255 * RX header they pull before we get here, and that should
256 * be big enough for our radiotap information. We should
257 * probably export the length to drivers so that we can have
258 * them allocate enough headroom to start with.
260 if (skb_headroom(skb
) < needed_headroom
&&
261 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
267 * Need to make a copy and possibly remove radiotap header
268 * and FCS from the original.
270 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
272 origskb
= remove_monitor_info(local
, origskb
);
278 /* prepend radiotap information */
279 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
281 skb_reset_mac_header(skb
);
282 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
283 skb
->pkt_type
= PACKET_OTHERHOST
;
284 skb
->protocol
= htons(ETH_P_802_2
);
286 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
287 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
290 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
293 if (!ieee80211_sdata_running(sdata
))
297 skb2
= skb_clone(skb
, GFP_ATOMIC
);
299 skb2
->dev
= prev_dev
;
304 prev_dev
= sdata
->dev
;
305 sdata
->dev
->stats
.rx_packets
++;
306 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
319 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
321 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
324 /* does the frame have a qos control field? */
325 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
326 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
327 /* frame has qos control */
328 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
329 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
330 rx
->flags
|= IEEE80211_RX_AMSDU
;
332 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
335 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
337 * Sequence numbers for management frames, QoS data
338 * frames with a broadcast/multicast address in the
339 * Address 1 field, and all non-QoS data frames sent
340 * by QoS STAs are assigned using an additional single
341 * modulo-4096 counter, [...]
343 * We also use that counter for non-QoS STAs.
345 tid
= NUM_RX_DATA_QUEUES
- 1;
349 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
350 * For now, set skb->priority to 0 for other cases. */
351 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
355 * DOC: Packet alignment
357 * Drivers always need to pass packets that are aligned to two-byte boundaries
360 * Additionally, should, if possible, align the payload data in a way that
361 * guarantees that the contained IP header is aligned to a four-byte
362 * boundary. In the case of regular frames, this simply means aligning the
363 * payload to a four-byte boundary (because either the IP header is directly
364 * contained, or IV/RFC1042 headers that have a length divisible by four are
365 * in front of it). If the payload data is not properly aligned and the
366 * architecture doesn't support efficient unaligned operations, mac80211
367 * will align the data.
369 * With A-MSDU frames, however, the payload data address must yield two modulo
370 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
371 * push the IP header further back to a multiple of four again. Thankfully, the
372 * specs were sane enough this time around to require padding each A-MSDU
373 * subframe to a length that is a multiple of four.
375 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
376 * the payload is not supported, the driver is required to move the 802.11
377 * header to be directly in front of the payload in that case.
379 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
381 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
382 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
383 "unaligned packet at 0x%p\n", rx
->skb
->data
);
390 static ieee80211_rx_result debug_noinline
391 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
393 struct ieee80211_local
*local
= rx
->local
;
394 struct sk_buff
*skb
= rx
->skb
;
396 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
397 return ieee80211_scan_rx(rx
->sdata
, skb
);
399 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
400 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
401 /* drop all the other packets during a software scan anyway */
402 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
407 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
408 /* scanning finished during invoking of handlers */
409 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
410 return RX_DROP_UNUSABLE
;
417 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
419 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
421 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
424 return ieee80211_is_robust_mgmt_frame(hdr
);
428 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
430 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
432 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
435 return ieee80211_is_robust_mgmt_frame(hdr
);
439 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
440 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
442 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
443 struct ieee80211_mmie
*mmie
;
445 if (skb
->len
< 24 + sizeof(*mmie
) ||
446 !is_multicast_ether_addr(hdr
->da
))
449 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
450 return -1; /* not a robust management frame */
452 mmie
= (struct ieee80211_mmie
*)
453 (skb
->data
+ skb
->len
- sizeof(*mmie
));
454 if (mmie
->element_id
!= WLAN_EID_MMIE
||
455 mmie
->length
!= sizeof(*mmie
) - 2)
458 return le16_to_cpu(mmie
->key_id
);
462 static ieee80211_rx_result
463 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
465 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
466 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
467 char *dev_addr
= rx
->sdata
->vif
.addr
;
469 if (ieee80211_is_data(hdr
->frame_control
)) {
470 if (is_multicast_ether_addr(hdr
->addr1
)) {
471 if (ieee80211_has_tods(hdr
->frame_control
) ||
472 !ieee80211_has_fromds(hdr
->frame_control
))
473 return RX_DROP_MONITOR
;
474 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
475 return RX_DROP_MONITOR
;
477 if (!ieee80211_has_a4(hdr
->frame_control
))
478 return RX_DROP_MONITOR
;
479 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
480 return RX_DROP_MONITOR
;
484 /* If there is not an established peer link and this is not a peer link
485 * establisment frame, beacon or probe, drop the frame.
488 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
489 struct ieee80211_mgmt
*mgmt
;
491 if (!ieee80211_is_mgmt(hdr
->frame_control
))
492 return RX_DROP_MONITOR
;
494 if (ieee80211_is_action(hdr
->frame_control
)) {
495 mgmt
= (struct ieee80211_mgmt
*)hdr
;
496 if (mgmt
->u
.action
.category
!= MESH_PLINK_CATEGORY
)
497 return RX_DROP_MONITOR
;
501 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
502 ieee80211_is_probe_resp(hdr
->frame_control
) ||
503 ieee80211_is_beacon(hdr
->frame_control
))
506 return RX_DROP_MONITOR
;
510 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
512 if (ieee80211_is_data(hdr
->frame_control
) &&
513 is_multicast_ether_addr(hdr
->addr1
) &&
514 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
515 return RX_DROP_MONITOR
;
521 #define SEQ_MODULO 0x1000
522 #define SEQ_MASK 0xfff
524 static inline int seq_less(u16 sq1
, u16 sq2
)
526 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
529 static inline u16
seq_inc(u16 sq
)
531 return (sq
+ 1) & SEQ_MASK
;
534 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
536 return (sq1
- sq2
) & SEQ_MASK
;
540 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
541 struct tid_ampdu_rx
*tid_agg_rx
,
543 struct sk_buff_head
*frames
)
545 struct ieee80211_supported_band
*sband
;
546 struct ieee80211_rate
*rate
= NULL
;
547 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
548 struct ieee80211_rx_status
*status
;
553 status
= IEEE80211_SKB_RXCB(skb
);
555 /* release the reordered frames to stack */
556 sband
= hw
->wiphy
->bands
[status
->band
];
557 if (!(status
->flag
& RX_FLAG_HT
))
558 rate
= &sband
->bitrates
[status
->rate_idx
];
559 tid_agg_rx
->stored_mpdu_num
--;
560 tid_agg_rx
->reorder_buf
[index
] = NULL
;
561 __skb_queue_tail(frames
, skb
);
564 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
567 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
568 struct tid_ampdu_rx
*tid_agg_rx
,
570 struct sk_buff_head
*frames
)
574 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
575 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
576 tid_agg_rx
->buf_size
;
577 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
582 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
583 * the skb was added to the buffer longer than this time ago, the earlier
584 * frames that have not yet been received are assumed to be lost and the skb
585 * can be released for processing. This may also release other skb's from the
586 * reorder buffer if there are no additional gaps between the frames.
588 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
591 * As this function belongs to the RX path it must be under
592 * rcu_read_lock protection. It returns false if the frame
593 * can be processed immediately, true if it was consumed.
595 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
596 struct tid_ampdu_rx
*tid_agg_rx
,
598 struct sk_buff_head
*frames
)
600 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
601 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
602 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
603 u16 head_seq_num
, buf_size
;
606 buf_size
= tid_agg_rx
->buf_size
;
607 head_seq_num
= tid_agg_rx
->head_seq_num
;
609 /* frame with out of date sequence number */
610 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
616 * If frame the sequence number exceeds our buffering window
617 * size release some previous frames to make room for this one.
619 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
620 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
621 /* release stored frames up to new head to stack */
622 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
626 /* Now the new frame is always in the range of the reordering buffer */
628 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
630 /* check if we already stored this frame */
631 if (tid_agg_rx
->reorder_buf
[index
]) {
637 * If the current MPDU is in the right order and nothing else
638 * is stored we can process it directly, no need to buffer it.
640 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
641 tid_agg_rx
->stored_mpdu_num
== 0) {
642 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
646 /* put the frame in the reordering buffer */
647 tid_agg_rx
->reorder_buf
[index
] = skb
;
648 tid_agg_rx
->reorder_time
[index
] = jiffies
;
649 tid_agg_rx
->stored_mpdu_num
++;
650 /* release the buffer until next missing frame */
651 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
652 tid_agg_rx
->buf_size
;
653 if (!tid_agg_rx
->reorder_buf
[index
] &&
654 tid_agg_rx
->stored_mpdu_num
> 1) {
656 * No buffers ready to be released, but check whether any
657 * frames in the reorder buffer have timed out.
661 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
662 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
663 if (!tid_agg_rx
->reorder_buf
[j
]) {
667 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
668 HT_RX_REORDER_BUF_TIMEOUT
))
671 #ifdef CONFIG_MAC80211_HT_DEBUG
673 printk(KERN_DEBUG
"%s: release an RX reorder "
674 "frame due to timeout on earlier "
676 wiphy_name(hw
->wiphy
));
678 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
682 * Increment the head seq# also for the skipped slots.
684 tid_agg_rx
->head_seq_num
=
685 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
688 } else while (tid_agg_rx
->reorder_buf
[index
]) {
689 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
690 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
691 tid_agg_rx
->buf_size
;
698 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
699 * true if the MPDU was buffered, false if it should be processed.
701 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
702 struct sk_buff_head
*frames
)
704 struct sk_buff
*skb
= rx
->skb
;
705 struct ieee80211_local
*local
= rx
->local
;
706 struct ieee80211_hw
*hw
= &local
->hw
;
707 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
708 struct sta_info
*sta
= rx
->sta
;
709 struct tid_ampdu_rx
*tid_agg_rx
;
713 if (!ieee80211_is_data_qos(hdr
->frame_control
))
717 * filter the QoS data rx stream according to
718 * STA/TID and check if this STA/TID is on aggregation
724 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
726 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
729 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
731 /* qos null data frames are excluded */
732 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
735 /* new, potentially un-ordered, ampdu frame - process it */
737 /* reset session timer */
738 if (tid_agg_rx
->timeout
)
739 mod_timer(&tid_agg_rx
->session_timer
,
740 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
742 /* if this mpdu is fragmented - terminate rx aggregation session */
743 sc
= le16_to_cpu(hdr
->seq_ctrl
);
744 if (sc
& IEEE80211_SCTL_FRAG
) {
745 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
746 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
751 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
))
755 __skb_queue_tail(frames
, skb
);
758 static ieee80211_rx_result debug_noinline
759 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
761 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
763 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
764 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
765 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
766 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
768 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
769 rx
->local
->dot11FrameDuplicateCount
++;
770 rx
->sta
->num_duplicates
++;
772 return RX_DROP_MONITOR
;
774 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
777 if (unlikely(rx
->skb
->len
< 16)) {
778 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
779 return RX_DROP_MONITOR
;
782 /* Drop disallowed frame classes based on STA auth/assoc state;
783 * IEEE 802.11, Chap 5.5.
785 * mac80211 filters only based on association state, i.e. it drops
786 * Class 3 frames from not associated stations. hostapd sends
787 * deauth/disassoc frames when needed. In addition, hostapd is
788 * responsible for filtering on both auth and assoc states.
791 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
792 return ieee80211_rx_mesh_check(rx
);
794 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
795 ieee80211_is_pspoll(hdr
->frame_control
)) &&
796 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
797 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
798 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
799 !ieee80211_has_tods(hdr
->frame_control
) &&
800 ieee80211_is_data(hdr
->frame_control
)) ||
801 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
802 /* Drop IBSS frames and frames for other hosts
804 return RX_DROP_MONITOR
;
807 return RX_DROP_MONITOR
;
814 static ieee80211_rx_result debug_noinline
815 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
817 struct sk_buff
*skb
= rx
->skb
;
818 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
819 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
822 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
823 struct ieee80211_key
*stakey
= NULL
;
824 int mmie_keyidx
= -1;
829 * There are four types of keys:
831 * - IGTK (group keys for management frames)
832 * - PTK (pairwise keys)
833 * - STK (station-to-station pairwise keys)
835 * When selecting a key, we have to distinguish between multicast
836 * (including broadcast) and unicast frames, the latter can only
837 * use PTKs and STKs while the former always use GTKs and IGTKs.
838 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
839 * unicast frames can also use key indices like GTKs. Hence, if we
840 * don't have a PTK/STK we check the key index for a WEP key.
842 * Note that in a regular BSS, multicast frames are sent by the
843 * AP only, associated stations unicast the frame to the AP first
844 * which then multicasts it on their behalf.
846 * There is also a slight problem in IBSS mode: GTKs are negotiated
847 * with each station, that is something we don't currently handle.
848 * The spec seems to expect that one negotiates the same key with
849 * every station but there's no such requirement; VLANs could be
854 * No point in finding a key and decrypting if the frame is neither
855 * addressed to us nor a multicast frame.
857 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
860 /* start without a key */
864 stakey
= rcu_dereference(rx
->sta
->key
);
866 if (!ieee80211_has_protected(hdr
->frame_control
))
867 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
869 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
871 /* Skip decryption if the frame is not protected. */
872 if (!ieee80211_has_protected(hdr
->frame_control
))
874 } else if (mmie_keyidx
>= 0) {
875 /* Broadcast/multicast robust management frame / BIP */
876 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
877 (status
->flag
& RX_FLAG_IV_STRIPPED
))
880 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
881 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
882 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
883 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
884 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
886 * The frame was not protected, so skip decryption. However, we
887 * need to set rx->key if there is a key that could have been
888 * used so that the frame may be dropped if encryption would
889 * have been expected.
891 struct ieee80211_key
*key
= NULL
;
892 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
893 is_multicast_ether_addr(hdr
->addr1
) &&
894 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
896 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
901 * The device doesn't give us the IV so we won't be
902 * able to look up the key. That's ok though, we
903 * don't need to decrypt the frame, we just won't
904 * be able to keep statistics accurate.
905 * Except for key threshold notifications, should
906 * we somehow allow the driver to tell us which key
907 * the hardware used if this flag is set?
909 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
910 (status
->flag
& RX_FLAG_IV_STRIPPED
))
913 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
915 if (rx
->skb
->len
< 8 + hdrlen
)
916 return RX_DROP_UNUSABLE
; /* TODO: count this? */
919 * no need to call ieee80211_wep_get_keyidx,
920 * it verifies a bunch of things we've done already
922 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
924 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
927 * RSNA-protected unicast frames should always be sent with
928 * pairwise or station-to-station keys, but for WEP we allow
929 * using a key index as well.
931 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
932 !is_multicast_ether_addr(hdr
->addr1
))
937 rx
->key
->tx_rx_count
++;
938 /* TODO: add threshold stuff again */
940 return RX_DROP_MONITOR
;
943 /* Check for weak IVs if possible */
944 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
945 ieee80211_is_data(hdr
->frame_control
) &&
946 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
947 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
948 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
949 rx
->sta
->wep_weak_iv_count
++;
951 switch (rx
->key
->conf
.alg
) {
953 result
= ieee80211_crypto_wep_decrypt(rx
);
956 result
= ieee80211_crypto_tkip_decrypt(rx
);
959 result
= ieee80211_crypto_ccmp_decrypt(rx
);
962 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
966 /* either the frame has been decrypted or will be dropped */
967 status
->flag
|= RX_FLAG_DECRYPTED
;
972 static ieee80211_rx_result debug_noinline
973 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
975 struct ieee80211_local
*local
;
976 struct ieee80211_hdr
*hdr
;
981 hdr
= (struct ieee80211_hdr
*) skb
->data
;
983 if (!local
->pspolling
)
986 if (!ieee80211_has_fromds(hdr
->frame_control
))
987 /* this is not from AP */
990 if (!ieee80211_is_data(hdr
->frame_control
))
993 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
994 /* AP has no more frames buffered for us */
995 local
->pspolling
= false;
999 /* more data bit is set, let's request a new frame from the AP */
1000 ieee80211_send_pspoll(local
, rx
->sdata
);
1005 static void ap_sta_ps_start(struct sta_info
*sta
)
1007 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1008 struct ieee80211_local
*local
= sdata
->local
;
1010 atomic_inc(&sdata
->bss
->num_sta_ps
);
1011 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1012 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1013 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1014 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1015 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1016 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1019 static void ap_sta_ps_end(struct sta_info
*sta
)
1021 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1023 atomic_dec(&sdata
->bss
->num_sta_ps
);
1025 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
1027 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1028 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1029 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1030 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1032 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1033 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1034 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1035 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1036 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1040 ieee80211_sta_ps_deliver_wakeup(sta
);
1043 static ieee80211_rx_result debug_noinline
1044 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1046 struct sta_info
*sta
= rx
->sta
;
1047 struct sk_buff
*skb
= rx
->skb
;
1048 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1049 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1055 * Update last_rx only for IBSS packets which are for the current
1056 * BSSID to avoid keeping the current IBSS network alive in cases
1057 * where other STAs start using different BSSID.
1059 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1060 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1061 NL80211_IFTYPE_ADHOC
);
1062 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1063 sta
->last_rx
= jiffies
;
1064 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1066 * Mesh beacons will update last_rx when if they are found to
1067 * match the current local configuration when processed.
1069 sta
->last_rx
= jiffies
;
1072 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1075 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1076 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1078 sta
->rx_fragments
++;
1079 sta
->rx_bytes
+= rx
->skb
->len
;
1080 sta
->last_signal
= status
->signal
;
1081 sta
->last_noise
= status
->noise
;
1084 * Change STA power saving mode only at the end of a frame
1085 * exchange sequence.
1087 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1088 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1089 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1090 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1092 * Ignore doze->wake transitions that are
1093 * indicated by non-data frames, the standard
1094 * is unclear here, but for example going to
1095 * PS mode and then scanning would cause a
1096 * doze->wake transition for the probe request,
1097 * and that is clearly undesirable.
1099 if (ieee80211_is_data(hdr
->frame_control
) &&
1100 !ieee80211_has_pm(hdr
->frame_control
))
1103 if (ieee80211_has_pm(hdr
->frame_control
))
1104 ap_sta_ps_start(sta
);
1109 * Drop (qos-)data::nullfunc frames silently, since they
1110 * are used only to control station power saving mode.
1112 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1113 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1114 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1117 * If we receive a 4-addr nullfunc frame from a STA
1118 * that was not moved to a 4-addr STA vlan yet, drop
1119 * the frame to the monitor interface, to make sure
1120 * that hostapd sees it
1122 if (ieee80211_has_a4(hdr
->frame_control
) &&
1123 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1124 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1125 !rx
->sdata
->u
.vlan
.sta
)))
1126 return RX_DROP_MONITOR
;
1128 * Update counter and free packet here to avoid
1129 * counting this as a dropped packed.
1132 dev_kfree_skb(rx
->skb
);
1137 } /* ieee80211_rx_h_sta_process */
1139 static inline struct ieee80211_fragment_entry
*
1140 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1141 unsigned int frag
, unsigned int seq
, int rx_queue
,
1142 struct sk_buff
**skb
)
1144 struct ieee80211_fragment_entry
*entry
;
1147 idx
= sdata
->fragment_next
;
1148 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1149 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1150 sdata
->fragment_next
= 0;
1152 if (!skb_queue_empty(&entry
->skb_list
)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1154 struct ieee80211_hdr
*hdr
=
1155 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1156 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1157 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1158 "addr1=%pM addr2=%pM\n",
1160 jiffies
- entry
->first_frag_time
, entry
->seq
,
1161 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1163 __skb_queue_purge(&entry
->skb_list
);
1166 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1168 entry
->first_frag_time
= jiffies
;
1170 entry
->rx_queue
= rx_queue
;
1171 entry
->last_frag
= frag
;
1173 entry
->extra_len
= 0;
1178 static inline struct ieee80211_fragment_entry
*
1179 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1180 unsigned int frag
, unsigned int seq
,
1181 int rx_queue
, struct ieee80211_hdr
*hdr
)
1183 struct ieee80211_fragment_entry
*entry
;
1186 idx
= sdata
->fragment_next
;
1187 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1188 struct ieee80211_hdr
*f_hdr
;
1192 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1194 entry
= &sdata
->fragments
[idx
];
1195 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1196 entry
->rx_queue
!= rx_queue
||
1197 entry
->last_frag
+ 1 != frag
)
1200 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1203 * Check ftype and addresses are equal, else check next fragment
1205 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1206 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1207 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1208 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1211 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1212 __skb_queue_purge(&entry
->skb_list
);
1221 static ieee80211_rx_result debug_noinline
1222 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1224 struct ieee80211_hdr
*hdr
;
1227 unsigned int frag
, seq
;
1228 struct ieee80211_fragment_entry
*entry
;
1229 struct sk_buff
*skb
;
1231 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1232 fc
= hdr
->frame_control
;
1233 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1234 frag
= sc
& IEEE80211_SCTL_FRAG
;
1236 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1237 (rx
->skb
)->len
< 24 ||
1238 is_multicast_ether_addr(hdr
->addr1
))) {
1239 /* not fragmented */
1242 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1244 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1247 /* This is the first fragment of a new frame. */
1248 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1249 rx
->queue
, &(rx
->skb
));
1250 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1251 ieee80211_has_protected(fc
)) {
1252 /* Store CCMP PN so that we can verify that the next
1253 * fragment has a sequential PN value. */
1255 memcpy(entry
->last_pn
,
1256 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1262 /* This is a fragment for a frame that should already be pending in
1263 * fragment cache. Add this fragment to the end of the pending entry.
1265 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1267 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1268 return RX_DROP_MONITOR
;
1271 /* Verify that MPDUs within one MSDU have sequential PN values.
1272 * (IEEE 802.11i, 8.3.3.4.5) */
1275 u8 pn
[CCMP_PN_LEN
], *rpn
;
1276 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1277 return RX_DROP_UNUSABLE
;
1278 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1279 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1284 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1285 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1286 return RX_DROP_UNUSABLE
;
1287 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1290 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1291 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1292 entry
->last_frag
= frag
;
1293 entry
->extra_len
+= rx
->skb
->len
;
1294 if (ieee80211_has_morefrags(fc
)) {
1299 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1300 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1301 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1302 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1304 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1305 __skb_queue_purge(&entry
->skb_list
);
1306 return RX_DROP_UNUSABLE
;
1309 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1310 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1314 /* Complete frame has been reassembled - process it now */
1315 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1319 rx
->sta
->rx_packets
++;
1320 if (is_multicast_ether_addr(hdr
->addr1
))
1321 rx
->local
->dot11MulticastReceivedFrameCount
++;
1323 ieee80211_led_rx(rx
->local
);
1327 static ieee80211_rx_result debug_noinline
1328 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1330 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1331 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1333 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1334 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1337 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1338 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1339 return RX_DROP_UNUSABLE
;
1341 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1342 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1344 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1346 /* Free PS Poll skb here instead of returning RX_DROP that would
1347 * count as an dropped frame. */
1348 dev_kfree_skb(rx
->skb
);
1353 static ieee80211_rx_result debug_noinline
1354 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1356 u8
*data
= rx
->skb
->data
;
1357 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1359 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1362 /* remove the qos control field, update frame type and meta-data */
1363 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1364 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1365 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1366 /* change frame type to non QOS */
1367 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1373 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1375 if (unlikely(!rx
->sta
||
1376 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1383 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1385 struct sk_buff
*skb
= rx
->skb
;
1386 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1389 * Pass through unencrypted frames if the hardware has
1390 * decrypted them already.
1392 if (status
->flag
& RX_FLAG_DECRYPTED
)
1395 /* Drop unencrypted frames if key is set. */
1396 if (unlikely(!ieee80211_has_protected(fc
) &&
1397 !ieee80211_is_nullfunc(fc
) &&
1398 ieee80211_is_data(fc
) &&
1399 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1406 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1408 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1409 __le16 fc
= hdr
->frame_control
;
1412 res
= ieee80211_drop_unencrypted(rx
, fc
);
1416 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1417 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1420 /* BIP does not use Protected field, so need to check MMIE */
1421 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1422 ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1426 * When using MFP, Action frames are not allowed prior to
1427 * having configured keys.
1429 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1430 ieee80211_is_robust_mgmt_frame(
1431 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1439 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1441 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1442 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1444 if (ieee80211_has_a4(hdr
->frame_control
) &&
1445 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1448 if (is_multicast_ether_addr(hdr
->addr1
) &&
1449 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1450 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1453 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1457 * requires that rx->skb is a frame with ethernet header
1459 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1461 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1462 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1463 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1466 * Allow EAPOL frames to us/the PAE group address regardless
1467 * of whether the frame was encrypted or not.
1469 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1470 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1471 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1474 if (ieee80211_802_1x_port_control(rx
) ||
1475 ieee80211_drop_unencrypted(rx
, fc
))
1482 * requires that rx->skb is a frame with ethernet header
1485 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1487 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1488 struct net_device
*dev
= sdata
->dev
;
1489 struct sk_buff
*skb
, *xmit_skb
;
1490 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1491 struct sta_info
*dsta
;
1496 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1497 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1498 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1499 (rx
->flags
& IEEE80211_RX_RA_MATCH
) &&
1500 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1501 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1503 * send multicast frames both to higher layers in
1504 * local net stack and back to the wireless medium
1506 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1507 if (!xmit_skb
&& net_ratelimit())
1508 printk(KERN_DEBUG
"%s: failed to clone "
1509 "multicast frame\n", dev
->name
);
1511 dsta
= sta_info_get(sdata
, skb
->data
);
1514 * The destination station is associated to
1515 * this AP (in this VLAN), so send the frame
1516 * directly to it and do not pass it to local
1526 int align __maybe_unused
;
1528 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1530 * 'align' will only take the values 0 or 2 here
1531 * since all frames are required to be aligned
1532 * to 2-byte boundaries when being passed to
1533 * mac80211. That also explains the __skb_push()
1536 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1538 if (WARN_ON(skb_headroom(skb
) < 3)) {
1542 u8
*data
= skb
->data
;
1543 size_t len
= skb_headlen(skb
);
1545 memmove(skb
->data
, data
, len
);
1546 skb_set_tail_pointer(skb
, len
);
1552 /* deliver to local stack */
1553 skb
->protocol
= eth_type_trans(skb
, dev
);
1554 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1560 /* send to wireless media */
1561 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1562 skb_reset_network_header(xmit_skb
);
1563 skb_reset_mac_header(xmit_skb
);
1564 dev_queue_xmit(xmit_skb
);
1568 static ieee80211_rx_result debug_noinline
1569 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1571 struct net_device
*dev
= rx
->sdata
->dev
;
1572 struct sk_buff
*skb
= rx
->skb
;
1573 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1574 __le16 fc
= hdr
->frame_control
;
1575 struct sk_buff_head frame_list
;
1577 if (unlikely(!ieee80211_is_data(fc
)))
1580 if (unlikely(!ieee80211_is_data_present(fc
)))
1581 return RX_DROP_MONITOR
;
1583 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1586 if (ieee80211_has_a4(hdr
->frame_control
) &&
1587 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1588 !rx
->sdata
->u
.vlan
.sta
)
1589 return RX_DROP_UNUSABLE
;
1591 if (is_multicast_ether_addr(hdr
->addr1
) &&
1592 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1593 rx
->sdata
->u
.vlan
.sta
) ||
1594 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1595 rx
->sdata
->u
.mgd
.use_4addr
)))
1596 return RX_DROP_UNUSABLE
;
1599 __skb_queue_head_init(&frame_list
);
1601 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1602 rx
->sdata
->vif
.type
,
1603 rx
->local
->hw
.extra_tx_headroom
);
1605 while (!skb_queue_empty(&frame_list
)) {
1606 rx
->skb
= __skb_dequeue(&frame_list
);
1608 if (!ieee80211_frame_allowed(rx
, fc
)) {
1609 dev_kfree_skb(rx
->skb
);
1612 dev
->stats
.rx_packets
++;
1613 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1615 ieee80211_deliver_skb(rx
);
1621 #ifdef CONFIG_MAC80211_MESH
1622 static ieee80211_rx_result
1623 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1625 struct ieee80211_hdr
*hdr
;
1626 struct ieee80211s_hdr
*mesh_hdr
;
1627 unsigned int hdrlen
;
1628 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1629 struct ieee80211_local
*local
= rx
->local
;
1630 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1632 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1633 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1634 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1636 if (!ieee80211_is_data(hdr
->frame_control
))
1641 return RX_DROP_MONITOR
;
1643 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1644 struct mesh_path
*mppath
;
1648 if (is_multicast_ether_addr(hdr
->addr1
)) {
1649 mpp_addr
= hdr
->addr3
;
1650 proxied_addr
= mesh_hdr
->eaddr1
;
1652 mpp_addr
= hdr
->addr4
;
1653 proxied_addr
= mesh_hdr
->eaddr2
;
1657 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1659 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1661 spin_lock_bh(&mppath
->state_lock
);
1662 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1663 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1664 spin_unlock_bh(&mppath
->state_lock
);
1669 /* Frame has reached destination. Don't forward */
1670 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1671 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1676 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1678 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1679 dropped_frames_ttl
);
1681 struct ieee80211_hdr
*fwd_hdr
;
1682 struct ieee80211_tx_info
*info
;
1684 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1686 if (!fwd_skb
&& net_ratelimit())
1687 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1690 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1691 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1692 info
= IEEE80211_SKB_CB(fwd_skb
);
1693 memset(info
, 0, sizeof(*info
));
1694 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1695 info
->control
.vif
= &rx
->sdata
->vif
;
1696 skb_set_queue_mapping(skb
,
1697 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1698 ieee80211_set_qos_hdr(local
, skb
);
1699 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1700 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1705 * Save TA to addr1 to send TA a path error if a
1706 * suitable next hop is not found
1708 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1710 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1711 /* Failed to immediately resolve next hop:
1712 * fwded frame was dropped or will be added
1713 * later to the pending skb queue. */
1715 return RX_DROP_MONITOR
;
1717 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1720 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1722 ieee80211_add_pending_skb(local
, fwd_skb
);
1726 if (is_multicast_ether_addr(hdr
->addr1
) ||
1727 sdata
->dev
->flags
& IFF_PROMISC
)
1730 return RX_DROP_MONITOR
;
1734 static ieee80211_rx_result debug_noinline
1735 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1737 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1738 struct ieee80211_local
*local
= rx
->local
;
1739 struct net_device
*dev
= sdata
->dev
;
1740 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1741 __le16 fc
= hdr
->frame_control
;
1744 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1747 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1748 return RX_DROP_MONITOR
;
1751 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1752 * that a 4-addr station can be detected and moved into a separate VLAN
1754 if (ieee80211_has_a4(hdr
->frame_control
) &&
1755 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1756 return RX_DROP_MONITOR
;
1758 err
= __ieee80211_data_to_8023(rx
);
1760 return RX_DROP_UNUSABLE
;
1762 if (!ieee80211_frame_allowed(rx
, fc
))
1763 return RX_DROP_MONITOR
;
1767 dev
->stats
.rx_packets
++;
1768 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1770 if (ieee80211_is_data(hdr
->frame_control
) &&
1771 !is_multicast_ether_addr(hdr
->addr1
) &&
1772 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1773 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1774 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1777 ieee80211_deliver_skb(rx
);
1782 static ieee80211_rx_result debug_noinline
1783 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1785 struct ieee80211_local
*local
= rx
->local
;
1786 struct ieee80211_hw
*hw
= &local
->hw
;
1787 struct sk_buff
*skb
= rx
->skb
;
1788 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1789 struct tid_ampdu_rx
*tid_agg_rx
;
1793 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1796 if (ieee80211_is_back_req(bar
->frame_control
)) {
1798 return RX_DROP_MONITOR
;
1799 tid
= le16_to_cpu(bar
->control
) >> 12;
1800 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1801 != HT_AGG_STATE_OPERATIONAL
)
1802 return RX_DROP_MONITOR
;
1803 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1805 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1807 /* reset session timer */
1808 if (tid_agg_rx
->timeout
)
1809 mod_timer(&tid_agg_rx
->session_timer
,
1810 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1812 /* release stored frames up to start of BAR */
1813 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1822 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1823 struct ieee80211_mgmt
*mgmt
,
1826 struct ieee80211_local
*local
= sdata
->local
;
1827 struct sk_buff
*skb
;
1828 struct ieee80211_mgmt
*resp
;
1830 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1831 /* Not to own unicast address */
1835 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1836 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1837 /* Not from the current AP or not associated yet. */
1841 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1842 /* Too short SA Query request frame */
1846 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1850 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1851 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1852 memset(resp
, 0, 24);
1853 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1854 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
1855 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1856 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1857 IEEE80211_STYPE_ACTION
);
1858 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1859 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1860 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1861 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1862 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1863 WLAN_SA_QUERY_TR_ID_LEN
);
1865 ieee80211_tx_skb(sdata
, skb
);
1868 static ieee80211_rx_result debug_noinline
1869 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1871 struct ieee80211_local
*local
= rx
->local
;
1872 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1873 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1874 struct sk_buff
*nskb
;
1875 struct ieee80211_rx_status
*status
;
1876 int len
= rx
->skb
->len
;
1878 if (!ieee80211_is_action(mgmt
->frame_control
))
1881 /* drop too small frames */
1882 if (len
< IEEE80211_MIN_ACTION_SIZE
)
1883 return RX_DROP_UNUSABLE
;
1885 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
1886 return RX_DROP_UNUSABLE
;
1888 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1889 return RX_DROP_UNUSABLE
;
1891 if (ieee80211_drop_unencrypted_mgmt(rx
))
1892 return RX_DROP_UNUSABLE
;
1894 switch (mgmt
->u
.action
.category
) {
1895 case WLAN_CATEGORY_BACK
:
1897 * The aggregation code is not prepared to handle
1898 * anything but STA/AP due to the BSSID handling;
1899 * IBSS could work in the code but isn't supported
1900 * by drivers or the standard.
1902 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1903 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1904 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1907 /* verify action_code is present */
1908 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1911 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1912 case WLAN_ACTION_ADDBA_REQ
:
1913 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1914 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1915 return RX_DROP_MONITOR
;
1916 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1918 case WLAN_ACTION_ADDBA_RESP
:
1919 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1920 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1922 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1924 case WLAN_ACTION_DELBA
:
1925 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1926 sizeof(mgmt
->u
.action
.u
.delba
)))
1928 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1932 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1933 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1936 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1939 /* verify action_code is present */
1940 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1943 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1944 case WLAN_ACTION_SPCT_MSR_REQ
:
1945 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1946 sizeof(mgmt
->u
.action
.u
.measurement
)))
1948 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1950 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1951 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1952 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1955 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1958 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1961 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
1964 case WLAN_CATEGORY_SA_QUERY
:
1965 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1966 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1969 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1970 case WLAN_ACTION_SA_QUERY_REQUEST
:
1971 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1973 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1977 case MESH_PLINK_CATEGORY
:
1978 case MESH_PATH_SEL_CATEGORY
:
1979 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1980 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
1985 * For AP mode, hostapd is responsible for handling any action
1986 * frames that we didn't handle, including returning unknown
1987 * ones. For all other modes we will return them to the sender,
1988 * setting the 0x80 bit in the action category, as required by
1989 * 802.11-2007 7.3.1.11.
1991 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1992 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1993 return RX_DROP_MONITOR
;
1996 * Getting here means the kernel doesn't know how to handle
1997 * it, but maybe userspace does ... include returned frames
1998 * so userspace can register for those to know whether ones
1999 * it transmitted were processed or returned.
2001 status
= IEEE80211_SKB_RXCB(rx
->skb
);
2003 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2004 cfg80211_rx_action(rx
->sdata
->dev
, status
->freq
,
2005 rx
->skb
->data
, rx
->skb
->len
,
2009 /* do not return rejected action frames */
2010 if (mgmt
->u
.action
.category
& 0x80)
2011 return RX_DROP_UNUSABLE
;
2013 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2016 struct ieee80211_mgmt
*mgmt
= (void *)nskb
->data
;
2018 mgmt
->u
.action
.category
|= 0x80;
2019 memcpy(mgmt
->da
, mgmt
->sa
, ETH_ALEN
);
2020 memcpy(mgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2022 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2024 ieee80211_tx_skb(rx
->sdata
, nskb
);
2029 rx
->sta
->rx_packets
++;
2030 dev_kfree_skb(rx
->skb
);
2034 static ieee80211_rx_result debug_noinline
2035 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2037 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2038 ieee80211_rx_result rxs
;
2040 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
2041 return RX_DROP_MONITOR
;
2043 if (ieee80211_drop_unencrypted_mgmt(rx
))
2044 return RX_DROP_UNUSABLE
;
2046 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2047 if (rxs
!= RX_CONTINUE
)
2050 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2051 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2053 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2054 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
);
2056 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2057 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
2059 return RX_DROP_MONITOR
;
2062 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2063 struct ieee80211_rx_data
*rx
)
2066 unsigned int hdrlen
;
2068 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2069 if (rx
->skb
->len
>= hdrlen
+ 4)
2070 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2076 * Some hardware seem to generate incorrect Michael MIC
2077 * reports; ignore them to avoid triggering countermeasures.
2082 if (!ieee80211_has_protected(hdr
->frame_control
))
2085 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2087 * APs with pairwise keys should never receive Michael MIC
2088 * errors for non-zero keyidx because these are reserved for
2089 * group keys and only the AP is sending real multicast
2090 * frames in the BSS.
2095 if (!ieee80211_is_data(hdr
->frame_control
) &&
2096 !ieee80211_is_auth(hdr
->frame_control
))
2099 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2103 /* TODO: use IEEE80211_RX_FRAGMENTED */
2104 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2105 struct ieee80211_rate
*rate
)
2107 struct ieee80211_sub_if_data
*sdata
;
2108 struct ieee80211_local
*local
= rx
->local
;
2109 struct ieee80211_rtap_hdr
{
2110 struct ieee80211_radiotap_header hdr
;
2115 } __attribute__ ((packed
)) *rthdr
;
2116 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2117 struct net_device
*prev_dev
= NULL
;
2118 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2120 if (status
->flag
& RX_FLAG_INTERNAL_CMTR
)
2123 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2124 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2127 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2128 memset(rthdr
, 0, sizeof(*rthdr
));
2129 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2130 rthdr
->hdr
.it_present
=
2131 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2132 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2135 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2136 rthdr
->hdr
.it_present
|=
2137 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2139 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2141 if (status
->band
== IEEE80211_BAND_5GHZ
)
2142 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2143 IEEE80211_CHAN_5GHZ
);
2145 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2146 IEEE80211_CHAN_2GHZ
);
2148 skb_set_mac_header(skb
, 0);
2149 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2150 skb
->pkt_type
= PACKET_OTHERHOST
;
2151 skb
->protocol
= htons(ETH_P_802_2
);
2153 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2154 if (!ieee80211_sdata_running(sdata
))
2157 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2158 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2162 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2164 skb2
->dev
= prev_dev
;
2169 prev_dev
= sdata
->dev
;
2170 sdata
->dev
->stats
.rx_packets
++;
2171 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2175 skb
->dev
= prev_dev
;
2181 status
->flag
|= RX_FLAG_INTERNAL_CMTR
;
2189 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2190 struct ieee80211_rx_data
*rx
,
2191 struct sk_buff
*skb
,
2192 struct ieee80211_rate
*rate
)
2194 struct sk_buff_head reorder_release
;
2195 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2197 __skb_queue_head_init(&reorder_release
);
2202 #define CALL_RXH(rxh) \
2205 if (res != RX_CONTINUE) \
2210 * NB: the rxh_next label works even if we jump
2211 * to it from here because then the list will
2212 * be empty, which is a trivial check
2214 CALL_RXH(ieee80211_rx_h_passive_scan
)
2215 CALL_RXH(ieee80211_rx_h_check
)
2217 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2219 while ((skb
= __skb_dequeue(&reorder_release
))) {
2221 * all the other fields are valid across frames
2222 * that belong to an aMPDU since they are on the
2223 * same TID from the same station
2227 CALL_RXH(ieee80211_rx_h_decrypt
)
2228 CALL_RXH(ieee80211_rx_h_check_more_data
)
2229 CALL_RXH(ieee80211_rx_h_sta_process
)
2230 CALL_RXH(ieee80211_rx_h_defragment
)
2231 CALL_RXH(ieee80211_rx_h_ps_poll
)
2232 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2233 /* must be after MMIC verify so header is counted in MPDU mic */
2234 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2235 CALL_RXH(ieee80211_rx_h_amsdu
)
2236 #ifdef CONFIG_MAC80211_MESH
2237 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2238 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2240 CALL_RXH(ieee80211_rx_h_data
)
2242 /* special treatment -- needs the queue */
2243 res
= ieee80211_rx_h_ctrl(rx
, &reorder_release
);
2244 if (res
!= RX_CONTINUE
)
2247 CALL_RXH(ieee80211_rx_h_action
)
2248 CALL_RXH(ieee80211_rx_h_mgmt
)
2254 case RX_DROP_MONITOR
:
2255 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2257 rx
->sta
->rx_dropped
++;
2260 ieee80211_rx_cooked_monitor(rx
, rate
);
2262 case RX_DROP_UNUSABLE
:
2263 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2265 rx
->sta
->rx_dropped
++;
2266 dev_kfree_skb(rx
->skb
);
2269 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2275 /* main receive path */
2277 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2278 struct ieee80211_rx_data
*rx
,
2279 struct ieee80211_hdr
*hdr
)
2281 struct sk_buff
*skb
= rx
->skb
;
2282 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2283 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2284 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2286 switch (sdata
->vif
.type
) {
2287 case NL80211_IFTYPE_STATION
:
2288 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2291 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2292 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2294 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2297 case NL80211_IFTYPE_ADHOC
:
2300 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2303 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2304 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2306 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2307 } else if (!multicast
&&
2308 compare_ether_addr(sdata
->vif
.addr
,
2310 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2312 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2313 } else if (!rx
->sta
) {
2315 if (status
->flag
& RX_FLAG_HT
)
2316 rate_idx
= 0; /* TODO: HT rates */
2318 rate_idx
= status
->rate_idx
;
2319 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2320 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2323 case NL80211_IFTYPE_MESH_POINT
:
2325 compare_ether_addr(sdata
->vif
.addr
,
2327 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2330 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2333 case NL80211_IFTYPE_AP_VLAN
:
2334 case NL80211_IFTYPE_AP
:
2336 if (compare_ether_addr(sdata
->vif
.addr
,
2339 } else if (!ieee80211_bssid_match(bssid
,
2341 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2343 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2346 case NL80211_IFTYPE_WDS
:
2347 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2349 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2352 case NL80211_IFTYPE_MONITOR
:
2353 case NL80211_IFTYPE_UNSPECIFIED
:
2354 case __NL80211_IFTYPE_AFTER_LAST
:
2355 /* should never get here */
2364 * This is the actual Rx frames handler. as it blongs to Rx path it must
2365 * be called with rcu_read_lock protection.
2367 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2368 struct sk_buff
*skb
,
2369 struct ieee80211_rate
*rate
)
2371 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2372 struct ieee80211_local
*local
= hw_to_local(hw
);
2373 struct ieee80211_sub_if_data
*sdata
;
2374 struct ieee80211_hdr
*hdr
;
2375 struct ieee80211_rx_data rx
;
2377 struct ieee80211_sub_if_data
*prev
= NULL
;
2378 struct sk_buff
*skb_new
;
2379 struct sta_info
*sta
, *tmp
;
2380 bool found_sta
= false;
2382 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2383 memset(&rx
, 0, sizeof(rx
));
2387 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2388 local
->dot11ReceivedFragmentCount
++;
2390 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2391 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2392 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2394 ieee80211_parse_qos(&rx
);
2395 ieee80211_verify_alignment(&rx
);
2397 if (ieee80211_is_data(hdr
->frame_control
)) {
2398 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2401 rx
.sdata
= sta
->sdata
;
2403 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2404 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2406 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2407 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2408 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2415 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2416 if (!ieee80211_sdata_running(sdata
))
2419 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2420 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2424 * frame is destined for this interface, but if it's
2425 * not also for the previous one we handle that after
2426 * the loop to avoid copying the SKB once too much
2434 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2436 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2437 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2442 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2444 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2445 ieee80211_rx_michael_mic_report(hdr
,
2451 * frame was destined for the previous interface
2452 * so invoke RX handlers for it
2455 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2457 if (net_ratelimit())
2458 printk(KERN_DEBUG
"%s: failed to copy "
2459 "multicast frame for %s\n",
2460 wiphy_name(local
->hw
.wiphy
),
2464 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
, rate
);
2470 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2472 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2473 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2480 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
, rate
);
2486 * This is the receive path handler. It is called by a low level driver when an
2487 * 802.11 MPDU is received from the hardware.
2489 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2491 struct ieee80211_local
*local
= hw_to_local(hw
);
2492 struct ieee80211_rate
*rate
= NULL
;
2493 struct ieee80211_supported_band
*sband
;
2494 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2496 WARN_ON_ONCE(softirq_count() == 0);
2498 if (WARN_ON(status
->band
< 0 ||
2499 status
->band
>= IEEE80211_NUM_BANDS
))
2502 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2503 if (WARN_ON(!sband
))
2507 * If we're suspending, it is possible although not too likely
2508 * that we'd be receiving frames after having already partially
2509 * quiesced the stack. We can't process such frames then since
2510 * that might, for example, cause stations to be added or other
2511 * driver callbacks be invoked.
2513 if (unlikely(local
->quiescing
|| local
->suspended
))
2517 * The same happens when we're not even started,
2518 * but that's worth a warning.
2520 if (WARN_ON(!local
->started
))
2523 if (status
->flag
& RX_FLAG_HT
) {
2525 * rate_idx is MCS index, which can be [0-76] as documented on:
2527 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2529 * Anything else would be some sort of driver or hardware error.
2530 * The driver should catch hardware errors.
2532 if (WARN((status
->rate_idx
< 0 ||
2533 status
->rate_idx
> 76),
2534 "Rate marked as an HT rate but passed "
2535 "status->rate_idx is not "
2536 "an MCS index [0-76]: %d (0x%02x)\n",
2541 if (WARN_ON(status
->rate_idx
< 0 ||
2542 status
->rate_idx
>= sband
->n_bitrates
))
2544 rate
= &sband
->bitrates
[status
->rate_idx
];
2548 * key references and virtual interfaces are protected using RCU
2549 * and this requires that we are in a read-side RCU section during
2550 * receive processing
2555 * Frames with failed FCS/PLCP checksum are not returned,
2556 * all other frames are returned without radiotap header
2557 * if it was previously present.
2558 * Also, frames with less than 16 bytes are dropped.
2560 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2566 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2574 EXPORT_SYMBOL(ieee80211_rx
);
2576 /* This is a version of the rx handler that can be called from hard irq
2577 * context. Post the skb on the queue and schedule the tasklet */
2578 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2580 struct ieee80211_local
*local
= hw_to_local(hw
);
2582 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2584 skb
->pkt_type
= IEEE80211_RX_MSG
;
2585 skb_queue_tail(&local
->skb_queue
, skb
);
2586 tasklet_schedule(&local
->tasklet
);
2588 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);