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
;
318 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
321 /* does the frame have a qos control field? */
322 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
323 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
324 /* frame has qos control */
325 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
326 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
327 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
338 * We also use that counter for non-QoS STAs.
340 tid
= NUM_RX_DATA_QUEUES
- 1;
344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
350 * DOC: Packet alignment
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
374 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
378 "unaligned packet at 0x%p\n", rx
->skb
->data
);
385 static ieee80211_rx_result debug_noinline
386 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
388 struct ieee80211_local
*local
= rx
->local
;
389 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
390 struct sk_buff
*skb
= rx
->skb
;
392 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
)))
395 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
))
396 return ieee80211_scan_rx(rx
->sdata
, skb
);
398 if (test_bit(SCAN_SW_SCANNING
, &local
->scanning
)) {
399 /* drop all the other packets during a software scan anyway */
400 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
407 return RX_DROP_UNUSABLE
;
411 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
413 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
415 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
418 return ieee80211_is_robust_mgmt_frame(hdr
);
422 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
424 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
426 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
429 return ieee80211_is_robust_mgmt_frame(hdr
);
433 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
436 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
437 struct ieee80211_mmie
*mmie
;
439 if (skb
->len
< 24 + sizeof(*mmie
) ||
440 !is_multicast_ether_addr(hdr
->da
))
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
444 return -1; /* not a robust management frame */
446 mmie
= (struct ieee80211_mmie
*)
447 (skb
->data
+ skb
->len
- sizeof(*mmie
));
448 if (mmie
->element_id
!= WLAN_EID_MMIE
||
449 mmie
->length
!= sizeof(*mmie
) - 2)
452 return le16_to_cpu(mmie
->key_id
);
456 static ieee80211_rx_result
457 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
459 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
460 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
461 char *dev_addr
= rx
->sdata
->vif
.addr
;
463 if (ieee80211_is_data(hdr
->frame_control
)) {
464 if (is_multicast_ether_addr(hdr
->addr1
)) {
465 if (ieee80211_has_tods(hdr
->frame_control
) ||
466 !ieee80211_has_fromds(hdr
->frame_control
))
467 return RX_DROP_MONITOR
;
468 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
469 return RX_DROP_MONITOR
;
471 if (!ieee80211_has_a4(hdr
->frame_control
))
472 return RX_DROP_MONITOR
;
473 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
474 return RX_DROP_MONITOR
;
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
482 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
483 struct ieee80211_mgmt
*mgmt
;
485 if (!ieee80211_is_mgmt(hdr
->frame_control
))
486 return RX_DROP_MONITOR
;
488 if (ieee80211_is_action(hdr
->frame_control
)) {
489 mgmt
= (struct ieee80211_mgmt
*)hdr
;
490 if (mgmt
->u
.action
.category
!= WLAN_CATEGORY_MESH_PLINK
)
491 return RX_DROP_MONITOR
;
495 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
496 ieee80211_is_probe_resp(hdr
->frame_control
) ||
497 ieee80211_is_beacon(hdr
->frame_control
))
500 return RX_DROP_MONITOR
;
504 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
506 if (ieee80211_is_data(hdr
->frame_control
) &&
507 is_multicast_ether_addr(hdr
->addr1
) &&
508 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
509 return RX_DROP_MONITOR
;
515 #define SEQ_MODULO 0x1000
516 #define SEQ_MASK 0xfff
518 static inline int seq_less(u16 sq1
, u16 sq2
)
520 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
523 static inline u16
seq_inc(u16 sq
)
525 return (sq
+ 1) & SEQ_MASK
;
528 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
530 return (sq1
- sq2
) & SEQ_MASK
;
534 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
535 struct tid_ampdu_rx
*tid_agg_rx
,
537 struct sk_buff_head
*frames
)
539 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
544 /* release the frame from the reorder ring buffer */
545 tid_agg_rx
->stored_mpdu_num
--;
546 tid_agg_rx
->reorder_buf
[index
] = NULL
;
547 __skb_queue_tail(frames
, skb
);
550 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
553 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
554 struct tid_ampdu_rx
*tid_agg_rx
,
556 struct sk_buff_head
*frames
)
560 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
561 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
562 tid_agg_rx
->buf_size
;
563 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
568 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
569 * the skb was added to the buffer longer than this time ago, the earlier
570 * frames that have not yet been received are assumed to be lost and the skb
571 * can be released for processing. This may also release other skb's from the
572 * reorder buffer if there are no additional gaps between the frames.
574 * Callers must hold tid_agg_rx->reorder_lock.
576 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
578 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
579 struct tid_ampdu_rx
*tid_agg_rx
,
580 struct sk_buff_head
*frames
)
584 /* release the buffer until next missing frame */
585 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
586 tid_agg_rx
->buf_size
;
587 if (!tid_agg_rx
->reorder_buf
[index
] &&
588 tid_agg_rx
->stored_mpdu_num
> 1) {
590 * No buffers ready to be released, but check whether any
591 * frames in the reorder buffer have timed out.
594 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
595 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
596 if (!tid_agg_rx
->reorder_buf
[j
]) {
600 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
601 HT_RX_REORDER_BUF_TIMEOUT
))
602 goto set_release_timer
;
604 #ifdef CONFIG_MAC80211_HT_DEBUG
606 wiphy_debug(hw
->wiphy
,
607 "release an RX reorder frame due to timeout on earlier frames\n");
609 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
613 * Increment the head seq# also for the skipped slots.
615 tid_agg_rx
->head_seq_num
=
616 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
619 } else while (tid_agg_rx
->reorder_buf
[index
]) {
620 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
621 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
622 tid_agg_rx
->buf_size
;
625 if (tid_agg_rx
->stored_mpdu_num
) {
626 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
627 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
629 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
630 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
631 if (tid_agg_rx
->reorder_buf
[j
])
637 mod_timer(&tid_agg_rx
->reorder_timer
,
638 tid_agg_rx
->reorder_time
[j
] +
639 HT_RX_REORDER_BUF_TIMEOUT
);
641 del_timer(&tid_agg_rx
->reorder_timer
);
646 * As this function belongs to the RX path it must be under
647 * rcu_read_lock protection. It returns false if the frame
648 * can be processed immediately, true if it was consumed.
650 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
651 struct tid_ampdu_rx
*tid_agg_rx
,
653 struct sk_buff_head
*frames
)
655 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
656 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
657 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
658 u16 head_seq_num
, buf_size
;
662 buf_size
= tid_agg_rx
->buf_size
;
663 head_seq_num
= tid_agg_rx
->head_seq_num
;
665 spin_lock(&tid_agg_rx
->reorder_lock
);
666 /* frame with out of date sequence number */
667 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
673 * If frame the sequence number exceeds our buffering window
674 * size release some previous frames to make room for this one.
676 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
677 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
678 /* release stored frames up to new head to stack */
679 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
683 /* Now the new frame is always in the range of the reordering buffer */
685 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
687 /* check if we already stored this frame */
688 if (tid_agg_rx
->reorder_buf
[index
]) {
694 * If the current MPDU is in the right order and nothing else
695 * is stored we can process it directly, no need to buffer it.
697 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
698 tid_agg_rx
->stored_mpdu_num
== 0) {
699 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
704 /* put the frame in the reordering buffer */
705 tid_agg_rx
->reorder_buf
[index
] = skb
;
706 tid_agg_rx
->reorder_time
[index
] = jiffies
;
707 tid_agg_rx
->stored_mpdu_num
++;
708 ieee80211_sta_reorder_release(hw
, tid_agg_rx
, frames
);
711 spin_unlock(&tid_agg_rx
->reorder_lock
);
716 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
717 * true if the MPDU was buffered, false if it should be processed.
719 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
720 struct sk_buff_head
*frames
)
722 struct sk_buff
*skb
= rx
->skb
;
723 struct ieee80211_local
*local
= rx
->local
;
724 struct ieee80211_hw
*hw
= &local
->hw
;
725 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
726 struct sta_info
*sta
= rx
->sta
;
727 struct tid_ampdu_rx
*tid_agg_rx
;
731 if (!ieee80211_is_data_qos(hdr
->frame_control
))
735 * filter the QoS data rx stream according to
736 * STA/TID and check if this STA/TID is on aggregation
742 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
744 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
748 /* qos null data frames are excluded */
749 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
752 /* new, potentially un-ordered, ampdu frame - process it */
754 /* reset session timer */
755 if (tid_agg_rx
->timeout
)
756 mod_timer(&tid_agg_rx
->session_timer
,
757 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
759 /* if this mpdu is fragmented - terminate rx aggregation session */
760 sc
= le16_to_cpu(hdr
->seq_ctrl
);
761 if (sc
& IEEE80211_SCTL_FRAG
) {
762 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
763 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
764 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
769 * No locking needed -- we will only ever process one
770 * RX packet at a time, and thus own tid_agg_rx. All
771 * other code manipulating it needs to (and does) make
772 * sure that we cannot get to it any more before doing
775 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
))
779 __skb_queue_tail(frames
, skb
);
782 static ieee80211_rx_result debug_noinline
783 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
785 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
786 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
788 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
789 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
790 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
791 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
793 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
794 rx
->local
->dot11FrameDuplicateCount
++;
795 rx
->sta
->num_duplicates
++;
797 return RX_DROP_MONITOR
;
799 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
802 if (unlikely(rx
->skb
->len
< 16)) {
803 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
804 return RX_DROP_MONITOR
;
807 /* Drop disallowed frame classes based on STA auth/assoc state;
808 * IEEE 802.11, Chap 5.5.
810 * mac80211 filters only based on association state, i.e. it drops
811 * Class 3 frames from not associated stations. hostapd sends
812 * deauth/disassoc frames when needed. In addition, hostapd is
813 * responsible for filtering on both auth and assoc states.
816 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
817 return ieee80211_rx_mesh_check(rx
);
819 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
820 ieee80211_is_pspoll(hdr
->frame_control
)) &&
821 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
822 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
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 !(status
->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 (!(status
->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 (!(status
->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
;
1274 struct ieee80211_rx_status
*status
;
1276 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1277 fc
= hdr
->frame_control
;
1278 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1279 frag
= sc
& IEEE80211_SCTL_FRAG
;
1281 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1282 (rx
->skb
)->len
< 24 ||
1283 is_multicast_ether_addr(hdr
->addr1
))) {
1284 /* not fragmented */
1287 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1289 if (skb_linearize(rx
->skb
))
1290 return RX_DROP_UNUSABLE
;
1293 * skb_linearize() might change the skb->data and
1294 * previously cached variables (in this case, hdr) need to
1295 * be refreshed with the new data.
1297 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1298 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1301 /* This is the first fragment of a new frame. */
1302 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1303 rx
->queue
, &(rx
->skb
));
1304 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1305 ieee80211_has_protected(fc
)) {
1306 int queue
= ieee80211_is_mgmt(fc
) ?
1307 NUM_RX_DATA_QUEUES
: rx
->queue
;
1308 /* Store CCMP PN so that we can verify that the next
1309 * fragment has a sequential PN value. */
1311 memcpy(entry
->last_pn
,
1312 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1318 /* This is a fragment for a frame that should already be pending in
1319 * fragment cache. Add this fragment to the end of the pending entry.
1321 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1323 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1324 return RX_DROP_MONITOR
;
1327 /* Verify that MPDUs within one MSDU have sequential PN values.
1328 * (IEEE 802.11i, 8.3.3.4.5) */
1331 u8 pn
[CCMP_PN_LEN
], *rpn
;
1333 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1334 return RX_DROP_UNUSABLE
;
1335 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1336 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1341 queue
= ieee80211_is_mgmt(fc
) ?
1342 NUM_RX_DATA_QUEUES
: rx
->queue
;
1343 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1344 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1345 return RX_DROP_UNUSABLE
;
1346 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1349 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1350 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1351 entry
->last_frag
= frag
;
1352 entry
->extra_len
+= rx
->skb
->len
;
1353 if (ieee80211_has_morefrags(fc
)) {
1358 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1359 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1360 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1361 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1363 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1364 __skb_queue_purge(&entry
->skb_list
);
1365 return RX_DROP_UNUSABLE
;
1368 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1369 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1373 /* Complete frame has been reassembled - process it now */
1374 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1375 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1379 rx
->sta
->rx_packets
++;
1380 if (is_multicast_ether_addr(hdr
->addr1
))
1381 rx
->local
->dot11MulticastReceivedFrameCount
++;
1383 ieee80211_led_rx(rx
->local
);
1387 static ieee80211_rx_result debug_noinline
1388 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1390 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1391 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1392 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1394 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1395 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
)))
1398 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1399 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1400 return RX_DROP_UNUSABLE
;
1402 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1403 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1405 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1407 /* Free PS Poll skb here instead of returning RX_DROP that would
1408 * count as an dropped frame. */
1409 dev_kfree_skb(rx
->skb
);
1414 static ieee80211_rx_result debug_noinline
1415 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1417 u8
*data
= rx
->skb
->data
;
1418 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1420 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1423 /* remove the qos control field, update frame type and meta-data */
1424 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1425 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1426 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1427 /* change frame type to non QOS */
1428 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1434 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1436 if (unlikely(!rx
->sta
||
1437 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1444 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1446 struct sk_buff
*skb
= rx
->skb
;
1447 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1450 * Pass through unencrypted frames if the hardware has
1451 * decrypted them already.
1453 if (status
->flag
& RX_FLAG_DECRYPTED
)
1456 /* Drop unencrypted frames if key is set. */
1457 if (unlikely(!ieee80211_has_protected(fc
) &&
1458 !ieee80211_is_nullfunc(fc
) &&
1459 ieee80211_is_data(fc
) &&
1460 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1467 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1469 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1470 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1471 __le16 fc
= hdr
->frame_control
;
1474 * Pass through unencrypted frames if the hardware has
1475 * decrypted them already.
1477 if (status
->flag
& RX_FLAG_DECRYPTED
)
1480 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1481 if (unlikely(!ieee80211_has_protected(fc
) &&
1482 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1485 /* BIP does not use Protected field, so need to check MMIE */
1486 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1487 ieee80211_get_mmie_keyidx(rx
->skb
) < 0))
1490 * When using MFP, Action frames are not allowed prior to
1491 * having configured keys.
1493 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1494 ieee80211_is_robust_mgmt_frame(
1495 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1503 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1505 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1506 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1508 if (ieee80211_has_a4(hdr
->frame_control
) &&
1509 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1512 if (is_multicast_ether_addr(hdr
->addr1
) &&
1513 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1514 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1517 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1521 * requires that rx->skb is a frame with ethernet header
1523 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1525 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1526 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1527 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1530 * Allow EAPOL frames to us/the PAE group address regardless
1531 * of whether the frame was encrypted or not.
1533 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1534 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1535 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1538 if (ieee80211_802_1x_port_control(rx
) ||
1539 ieee80211_drop_unencrypted(rx
, fc
))
1546 * requires that rx->skb is a frame with ethernet header
1549 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1551 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1552 struct net_device
*dev
= sdata
->dev
;
1553 struct sk_buff
*skb
, *xmit_skb
;
1554 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1555 struct sta_info
*dsta
;
1556 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1561 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1562 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1563 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1564 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1565 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1566 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1568 * send multicast frames both to higher layers in
1569 * local net stack and back to the wireless medium
1571 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1572 if (!xmit_skb
&& net_ratelimit())
1573 printk(KERN_DEBUG
"%s: failed to clone "
1574 "multicast frame\n", dev
->name
);
1576 dsta
= sta_info_get(sdata
, skb
->data
);
1579 * The destination station is associated to
1580 * this AP (in this VLAN), so send the frame
1581 * directly to it and do not pass it to local
1591 int align __maybe_unused
;
1593 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1595 * 'align' will only take the values 0 or 2 here
1596 * since all frames are required to be aligned
1597 * to 2-byte boundaries when being passed to
1598 * mac80211. That also explains the __skb_push()
1601 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1603 if (WARN_ON(skb_headroom(skb
) < 3)) {
1607 u8
*data
= skb
->data
;
1608 size_t len
= skb_headlen(skb
);
1610 memmove(skb
->data
, data
, len
);
1611 skb_set_tail_pointer(skb
, len
);
1617 /* deliver to local stack */
1618 skb
->protocol
= eth_type_trans(skb
, dev
);
1619 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1620 netif_receive_skb(skb
);
1625 /* send to wireless media */
1626 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1627 skb_reset_network_header(xmit_skb
);
1628 skb_reset_mac_header(xmit_skb
);
1629 dev_queue_xmit(xmit_skb
);
1633 static ieee80211_rx_result debug_noinline
1634 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1636 struct net_device
*dev
= rx
->sdata
->dev
;
1637 struct sk_buff
*skb
= rx
->skb
;
1638 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1639 __le16 fc
= hdr
->frame_control
;
1640 struct sk_buff_head frame_list
;
1641 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1643 if (unlikely(!ieee80211_is_data(fc
)))
1646 if (unlikely(!ieee80211_is_data_present(fc
)))
1647 return RX_DROP_MONITOR
;
1649 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1652 if (ieee80211_has_a4(hdr
->frame_control
) &&
1653 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1654 !rx
->sdata
->u
.vlan
.sta
)
1655 return RX_DROP_UNUSABLE
;
1657 if (is_multicast_ether_addr(hdr
->addr1
) &&
1658 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1659 rx
->sdata
->u
.vlan
.sta
) ||
1660 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1661 rx
->sdata
->u
.mgd
.use_4addr
)))
1662 return RX_DROP_UNUSABLE
;
1665 __skb_queue_head_init(&frame_list
);
1667 if (skb_linearize(skb
))
1668 return RX_DROP_UNUSABLE
;
1670 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1671 rx
->sdata
->vif
.type
,
1672 rx
->local
->hw
.extra_tx_headroom
);
1674 while (!skb_queue_empty(&frame_list
)) {
1675 rx
->skb
= __skb_dequeue(&frame_list
);
1677 if (!ieee80211_frame_allowed(rx
, fc
)) {
1678 dev_kfree_skb(rx
->skb
);
1681 dev
->stats
.rx_packets
++;
1682 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1684 ieee80211_deliver_skb(rx
);
1690 #ifdef CONFIG_MAC80211_MESH
1691 static ieee80211_rx_result
1692 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1694 struct ieee80211_hdr
*hdr
;
1695 struct ieee80211s_hdr
*mesh_hdr
;
1696 unsigned int hdrlen
;
1697 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1698 struct ieee80211_local
*local
= rx
->local
;
1699 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1700 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1702 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1703 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1704 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1706 if (!ieee80211_is_data(hdr
->frame_control
))
1711 return RX_DROP_MONITOR
;
1713 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1714 struct mesh_path
*mppath
;
1718 if (is_multicast_ether_addr(hdr
->addr1
)) {
1719 mpp_addr
= hdr
->addr3
;
1720 proxied_addr
= mesh_hdr
->eaddr1
;
1722 mpp_addr
= hdr
->addr4
;
1723 proxied_addr
= mesh_hdr
->eaddr2
;
1727 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1729 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1731 spin_lock_bh(&mppath
->state_lock
);
1732 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1733 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1734 spin_unlock_bh(&mppath
->state_lock
);
1739 /* Frame has reached destination. Don't forward */
1740 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1741 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1746 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1748 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1749 dropped_frames_ttl
);
1751 struct ieee80211_hdr
*fwd_hdr
;
1752 struct ieee80211_tx_info
*info
;
1754 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1756 if (!fwd_skb
&& net_ratelimit())
1757 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1760 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1761 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1762 info
= IEEE80211_SKB_CB(fwd_skb
);
1763 memset(info
, 0, sizeof(*info
));
1764 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1765 info
->control
.vif
= &rx
->sdata
->vif
;
1766 skb_set_queue_mapping(skb
,
1767 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1768 ieee80211_set_qos_hdr(local
, skb
);
1769 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1770 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1775 * Save TA to addr1 to send TA a path error if a
1776 * suitable next hop is not found
1778 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1780 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1781 /* Failed to immediately resolve next hop:
1782 * fwded frame was dropped or will be added
1783 * later to the pending skb queue. */
1785 return RX_DROP_MONITOR
;
1787 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1790 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1792 ieee80211_add_pending_skb(local
, fwd_skb
);
1796 if (is_multicast_ether_addr(hdr
->addr1
) ||
1797 sdata
->dev
->flags
& IFF_PROMISC
)
1800 return RX_DROP_MONITOR
;
1804 static ieee80211_rx_result debug_noinline
1805 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1807 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1808 struct ieee80211_local
*local
= rx
->local
;
1809 struct net_device
*dev
= sdata
->dev
;
1810 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1811 __le16 fc
= hdr
->frame_control
;
1814 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1817 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1818 return RX_DROP_MONITOR
;
1821 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1822 * that a 4-addr station can be detected and moved into a separate VLAN
1824 if (ieee80211_has_a4(hdr
->frame_control
) &&
1825 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1826 return RX_DROP_MONITOR
;
1828 err
= __ieee80211_data_to_8023(rx
);
1830 return RX_DROP_UNUSABLE
;
1832 if (!ieee80211_frame_allowed(rx
, fc
))
1833 return RX_DROP_MONITOR
;
1837 dev
->stats
.rx_packets
++;
1838 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1840 if (ieee80211_is_data(hdr
->frame_control
) &&
1841 !is_multicast_ether_addr(hdr
->addr1
) &&
1842 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1843 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1844 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1847 ieee80211_deliver_skb(rx
);
1852 static ieee80211_rx_result debug_noinline
1853 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1855 struct ieee80211_local
*local
= rx
->local
;
1856 struct ieee80211_hw
*hw
= &local
->hw
;
1857 struct sk_buff
*skb
= rx
->skb
;
1858 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1859 struct tid_ampdu_rx
*tid_agg_rx
;
1863 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1866 if (ieee80211_is_back_req(bar
->frame_control
)) {
1868 __le16 control
, start_seq_num
;
1869 } __packed bar_data
;
1872 return RX_DROP_MONITOR
;
1874 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
1875 &bar_data
, sizeof(bar_data
)))
1876 return RX_DROP_MONITOR
;
1878 tid
= le16_to_cpu(bar_data
.control
) >> 12;
1880 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
1882 return RX_DROP_MONITOR
;
1884 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
1886 /* reset session timer */
1887 if (tid_agg_rx
->timeout
)
1888 mod_timer(&tid_agg_rx
->session_timer
,
1889 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1891 /* release stored frames up to start of BAR */
1892 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1899 * After this point, we only want management frames,
1900 * so we can drop all remaining control frames to
1901 * cooked monitor interfaces.
1903 return RX_DROP_MONITOR
;
1906 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1907 struct ieee80211_mgmt
*mgmt
,
1910 struct ieee80211_local
*local
= sdata
->local
;
1911 struct sk_buff
*skb
;
1912 struct ieee80211_mgmt
*resp
;
1914 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1915 /* Not to own unicast address */
1919 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1920 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1921 /* Not from the current AP or not associated yet. */
1925 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1926 /* Too short SA Query request frame */
1930 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1934 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1935 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1936 memset(resp
, 0, 24);
1937 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1938 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
1939 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1940 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1941 IEEE80211_STYPE_ACTION
);
1942 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1943 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1944 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1945 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1946 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1947 WLAN_SA_QUERY_TR_ID_LEN
);
1949 ieee80211_tx_skb(sdata
, skb
);
1952 static ieee80211_rx_result debug_noinline
1953 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
1955 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1956 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1959 * From here on, look only at management frames.
1960 * Data and control frames are already handled,
1961 * and unknown (reserved) frames are useless.
1963 if (rx
->skb
->len
< 24)
1964 return RX_DROP_MONITOR
;
1966 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
1967 return RX_DROP_MONITOR
;
1969 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1970 return RX_DROP_MONITOR
;
1972 if (ieee80211_drop_unencrypted_mgmt(rx
))
1973 return RX_DROP_UNUSABLE
;
1978 static ieee80211_rx_result debug_noinline
1979 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1981 struct ieee80211_local
*local
= rx
->local
;
1982 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1983 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1984 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1985 int len
= rx
->skb
->len
;
1987 if (!ieee80211_is_action(mgmt
->frame_control
))
1990 /* drop too small frames */
1991 if (len
< IEEE80211_MIN_ACTION_SIZE
)
1992 return RX_DROP_UNUSABLE
;
1994 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
1995 return RX_DROP_UNUSABLE
;
1997 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1998 return RX_DROP_UNUSABLE
;
2000 switch (mgmt
->u
.action
.category
) {
2001 case WLAN_CATEGORY_BACK
:
2003 * The aggregation code is not prepared to handle
2004 * anything but STA/AP due to the BSSID handling;
2005 * IBSS could work in the code but isn't supported
2006 * by drivers or the standard.
2008 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2009 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2010 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2013 /* verify action_code is present */
2014 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2017 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2018 case WLAN_ACTION_ADDBA_REQ
:
2019 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2020 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2023 case WLAN_ACTION_ADDBA_RESP
:
2024 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2025 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2028 case WLAN_ACTION_DELBA
:
2029 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2030 sizeof(mgmt
->u
.action
.u
.delba
)))
2038 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2039 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2042 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2045 /* verify action_code is present */
2046 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2049 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2050 case WLAN_ACTION_SPCT_MSR_REQ
:
2051 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2052 sizeof(mgmt
->u
.action
.u
.measurement
)))
2054 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2056 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2057 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2058 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2061 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2064 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2070 case WLAN_CATEGORY_SA_QUERY
:
2071 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2072 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2075 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2076 case WLAN_ACTION_SA_QUERY_REQUEST
:
2077 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2079 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2083 case WLAN_CATEGORY_MESH_PLINK
:
2084 case WLAN_CATEGORY_MESH_PATH_SEL
:
2085 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2093 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2094 /* will return in the next handlers */
2099 rx
->sta
->rx_packets
++;
2100 dev_kfree_skb(rx
->skb
);
2104 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2105 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2106 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2108 rx
->sta
->rx_packets
++;
2112 static ieee80211_rx_result debug_noinline
2113 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2115 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2117 /* skip known-bad action frames and return them in the next handler */
2118 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2122 * Getting here means the kernel doesn't know how to handle
2123 * it, but maybe userspace does ... include returned frames
2124 * so userspace can register for those to know whether ones
2125 * it transmitted were processed or returned.
2128 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2129 rx
->skb
->data
, rx
->skb
->len
,
2132 rx
->sta
->rx_packets
++;
2133 dev_kfree_skb(rx
->skb
);
2141 static ieee80211_rx_result debug_noinline
2142 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2144 struct ieee80211_local
*local
= rx
->local
;
2145 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2146 struct sk_buff
*nskb
;
2147 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2148 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2150 if (!ieee80211_is_action(mgmt
->frame_control
))
2154 * For AP mode, hostapd is responsible for handling any action
2155 * frames that we didn't handle, including returning unknown
2156 * ones. For all other modes we will return them to the sender,
2157 * setting the 0x80 bit in the action category, as required by
2158 * 802.11-2007 7.3.1.11.
2159 * Newer versions of hostapd shall also use the management frame
2160 * registration mechanisms, but older ones still use cooked
2161 * monitor interfaces so push all frames there.
2163 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2164 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2165 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2166 return RX_DROP_MONITOR
;
2168 /* do not return rejected action frames */
2169 if (mgmt
->u
.action
.category
& 0x80)
2170 return RX_DROP_UNUSABLE
;
2172 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2175 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2177 nmgmt
->u
.action
.category
|= 0x80;
2178 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2179 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2181 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2183 ieee80211_tx_skb(rx
->sdata
, nskb
);
2185 dev_kfree_skb(rx
->skb
);
2189 static ieee80211_rx_result debug_noinline
2190 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2192 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2193 ieee80211_rx_result rxs
;
2194 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2197 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2198 if (rxs
!= RX_CONTINUE
)
2201 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2203 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2204 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2205 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2206 return RX_DROP_MONITOR
;
2209 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2210 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2211 /* process for all: mesh, mlme, ibss */
2213 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2214 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2215 /* process only for station */
2216 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2217 return RX_DROP_MONITOR
;
2219 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2220 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2221 /* process only for ibss */
2222 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2223 return RX_DROP_MONITOR
;
2226 return RX_DROP_MONITOR
;
2229 /* queue up frame and kick off work to process it */
2230 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2231 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2232 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2234 rx
->sta
->rx_packets
++;
2239 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2240 struct ieee80211_rx_data
*rx
)
2243 unsigned int hdrlen
;
2245 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2246 if (rx
->skb
->len
>= hdrlen
+ 4)
2247 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2253 * Some hardware seem to generate incorrect Michael MIC
2254 * reports; ignore them to avoid triggering countermeasures.
2259 if (!ieee80211_has_protected(hdr
->frame_control
))
2262 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2264 * APs with pairwise keys should never receive Michael MIC
2265 * errors for non-zero keyidx because these are reserved for
2266 * group keys and only the AP is sending real multicast
2267 * frames in the BSS.
2272 if (!ieee80211_is_data(hdr
->frame_control
) &&
2273 !ieee80211_is_auth(hdr
->frame_control
))
2276 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2280 /* TODO: use IEEE80211_RX_FRAGMENTED */
2281 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2282 struct ieee80211_rate
*rate
)
2284 struct ieee80211_sub_if_data
*sdata
;
2285 struct ieee80211_local
*local
= rx
->local
;
2286 struct ieee80211_rtap_hdr
{
2287 struct ieee80211_radiotap_header hdr
;
2293 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2294 struct net_device
*prev_dev
= NULL
;
2295 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2298 * If cooked monitor has been processed already, then
2299 * don't do it again. If not, set the flag.
2301 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2303 rx
->flags
|= IEEE80211_RX_CMNTR
;
2305 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2306 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2309 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2310 memset(rthdr
, 0, sizeof(*rthdr
));
2311 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2312 rthdr
->hdr
.it_present
=
2313 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2314 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2317 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2318 rthdr
->hdr
.it_present
|=
2319 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2321 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2323 if (status
->band
== IEEE80211_BAND_5GHZ
)
2324 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2325 IEEE80211_CHAN_5GHZ
);
2327 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2328 IEEE80211_CHAN_2GHZ
);
2330 skb_set_mac_header(skb
, 0);
2331 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2332 skb
->pkt_type
= PACKET_OTHERHOST
;
2333 skb
->protocol
= htons(ETH_P_802_2
);
2335 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2336 if (!ieee80211_sdata_running(sdata
))
2339 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2340 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2344 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2346 skb2
->dev
= prev_dev
;
2347 netif_receive_skb(skb2
);
2351 prev_dev
= sdata
->dev
;
2352 sdata
->dev
->stats
.rx_packets
++;
2353 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2357 skb
->dev
= prev_dev
;
2358 netif_receive_skb(skb
);
2366 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2367 ieee80211_rx_result res
)
2370 case RX_DROP_MONITOR
:
2371 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2373 rx
->sta
->rx_dropped
++;
2376 struct ieee80211_rate
*rate
= NULL
;
2377 struct ieee80211_supported_band
*sband
;
2378 struct ieee80211_rx_status
*status
;
2380 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2382 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2383 if (!(status
->flag
& RX_FLAG_HT
))
2384 rate
= &sband
->bitrates
[status
->rate_idx
];
2386 ieee80211_rx_cooked_monitor(rx
, rate
);
2389 case RX_DROP_UNUSABLE
:
2390 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2392 rx
->sta
->rx_dropped
++;
2393 dev_kfree_skb(rx
->skb
);
2396 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2401 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2402 struct sk_buff_head
*frames
)
2404 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2405 struct sk_buff
*skb
;
2407 #define CALL_RXH(rxh) \
2410 if (res != RX_CONTINUE) \
2414 while ((skb
= __skb_dequeue(frames
))) {
2416 * all the other fields are valid across frames
2417 * that belong to an aMPDU since they are on the
2418 * same TID from the same station
2423 CALL_RXH(ieee80211_rx_h_decrypt
)
2424 CALL_RXH(ieee80211_rx_h_check_more_data
)
2425 CALL_RXH(ieee80211_rx_h_sta_process
)
2426 CALL_RXH(ieee80211_rx_h_defragment
)
2427 CALL_RXH(ieee80211_rx_h_ps_poll
)
2428 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2429 /* must be after MMIC verify so header is counted in MPDU mic */
2430 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2431 CALL_RXH(ieee80211_rx_h_amsdu
)
2432 #ifdef CONFIG_MAC80211_MESH
2433 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2434 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2436 CALL_RXH(ieee80211_rx_h_data
)
2438 /* special treatment -- needs the queue */
2439 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2440 if (res
!= RX_CONTINUE
)
2443 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2444 CALL_RXH(ieee80211_rx_h_action
)
2445 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2446 CALL_RXH(ieee80211_rx_h_action_return
)
2447 CALL_RXH(ieee80211_rx_h_mgmt
)
2450 ieee80211_rx_handlers_result(rx
, res
);
2456 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2458 struct sk_buff_head reorder_release
;
2459 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2461 __skb_queue_head_init(&reorder_release
);
2463 #define CALL_RXH(rxh) \
2466 if (res != RX_CONTINUE) \
2470 CALL_RXH(ieee80211_rx_h_passive_scan
)
2471 CALL_RXH(ieee80211_rx_h_check
)
2473 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2475 ieee80211_rx_handlers(rx
, &reorder_release
);
2479 ieee80211_rx_handlers_result(rx
, res
);
2485 * This function makes calls into the RX path. Therefore the
2486 * caller must hold the sta_info->lock and everything has to
2487 * be under rcu_read_lock protection as well.
2489 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2491 struct sk_buff_head frames
;
2492 struct ieee80211_rx_data rx
= {
2494 .sdata
= sta
->sdata
,
2495 .local
= sta
->local
,
2498 struct tid_ampdu_rx
*tid_agg_rx
;
2500 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2504 __skb_queue_head_init(&frames
);
2506 spin_lock(&tid_agg_rx
->reorder_lock
);
2507 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
, &frames
);
2508 spin_unlock(&tid_agg_rx
->reorder_lock
);
2510 ieee80211_rx_handlers(&rx
, &frames
);
2513 /* main receive path */
2515 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2516 struct ieee80211_hdr
*hdr
)
2518 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2519 struct sk_buff
*skb
= rx
->skb
;
2520 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2521 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2522 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2524 switch (sdata
->vif
.type
) {
2525 case NL80211_IFTYPE_STATION
:
2526 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2529 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2530 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2532 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2535 case NL80211_IFTYPE_ADHOC
:
2538 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2541 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2542 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2544 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2545 } else if (!multicast
&&
2546 compare_ether_addr(sdata
->vif
.addr
,
2548 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2550 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2551 } else if (!rx
->sta
) {
2553 if (status
->flag
& RX_FLAG_HT
)
2554 rate_idx
= 0; /* TODO: HT rates */
2556 rate_idx
= status
->rate_idx
;
2557 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2558 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2561 case NL80211_IFTYPE_MESH_POINT
:
2563 compare_ether_addr(sdata
->vif
.addr
,
2565 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2568 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2571 case NL80211_IFTYPE_AP_VLAN
:
2572 case NL80211_IFTYPE_AP
:
2574 if (compare_ether_addr(sdata
->vif
.addr
,
2577 } else if (!ieee80211_bssid_match(bssid
,
2579 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2581 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2584 case NL80211_IFTYPE_WDS
:
2585 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2587 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2591 /* should never get here */
2600 * This function returns whether or not the SKB
2601 * was destined for RX processing or not, which,
2602 * if consume is true, is equivalent to whether
2603 * or not the skb was consumed.
2605 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2606 struct sk_buff
*skb
, bool consume
)
2608 struct ieee80211_local
*local
= rx
->local
;
2609 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2610 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2611 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2615 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2616 prepares
= prepare_for_handlers(rx
, hdr
);
2621 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2622 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
)
2623 ieee80211_rx_michael_mic_report(hdr
, rx
);
2628 skb
= skb_copy(skb
, GFP_ATOMIC
);
2630 if (net_ratelimit())
2631 wiphy_debug(local
->hw
.wiphy
,
2632 "failed to copy multicast frame for %s\n",
2640 ieee80211_invoke_rx_handlers(rx
);
2645 * This is the actual Rx frames handler. as it blongs to Rx path it must
2646 * be called with rcu_read_lock protection.
2648 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2649 struct sk_buff
*skb
)
2651 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2652 struct ieee80211_local
*local
= hw_to_local(hw
);
2653 struct ieee80211_sub_if_data
*sdata
;
2654 struct ieee80211_hdr
*hdr
;
2656 struct ieee80211_rx_data rx
;
2657 struct ieee80211_sub_if_data
*prev
;
2658 struct sta_info
*sta
, *tmp
, *prev_sta
;
2661 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2662 memset(&rx
, 0, sizeof(rx
));
2666 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2667 local
->dot11ReceivedFragmentCount
++;
2669 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2670 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2671 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2673 if (ieee80211_is_mgmt(fc
))
2674 err
= skb_linearize(skb
);
2676 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2683 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2684 ieee80211_parse_qos(&rx
);
2685 ieee80211_verify_alignment(&rx
);
2687 if (ieee80211_is_data(fc
)) {
2690 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2697 rx
.sdata
= prev_sta
->sdata
;
2698 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2705 rx
.sdata
= prev_sta
->sdata
;
2707 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2714 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2715 if (!ieee80211_sdata_running(sdata
))
2718 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2719 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2723 * frame is destined for this interface, but if it's
2724 * not also for the previous one we handle that after
2725 * the loop to avoid copying the SKB once too much
2733 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2735 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2741 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2744 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2752 * This is the receive path handler. It is called by a low level driver when an
2753 * 802.11 MPDU is received from the hardware.
2755 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2757 struct ieee80211_local
*local
= hw_to_local(hw
);
2758 struct ieee80211_rate
*rate
= NULL
;
2759 struct ieee80211_supported_band
*sband
;
2760 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2762 WARN_ON_ONCE(softirq_count() == 0);
2764 if (WARN_ON(status
->band
< 0 ||
2765 status
->band
>= IEEE80211_NUM_BANDS
))
2768 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2769 if (WARN_ON(!sband
))
2773 * If we're suspending, it is possible although not too likely
2774 * that we'd be receiving frames after having already partially
2775 * quiesced the stack. We can't process such frames then since
2776 * that might, for example, cause stations to be added or other
2777 * driver callbacks be invoked.
2779 if (unlikely(local
->quiescing
|| local
->suspended
))
2783 * The same happens when we're not even started,
2784 * but that's worth a warning.
2786 if (WARN_ON(!local
->started
))
2789 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2791 * Validate the rate, unless a PLCP error means that
2792 * we probably can't have a valid rate here anyway.
2795 if (status
->flag
& RX_FLAG_HT
) {
2797 * rate_idx is MCS index, which can be [0-76]
2800 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2802 * Anything else would be some sort of driver or
2803 * hardware error. The driver should catch hardware
2806 if (WARN((status
->rate_idx
< 0 ||
2807 status
->rate_idx
> 76),
2808 "Rate marked as an HT rate but passed "
2809 "status->rate_idx is not "
2810 "an MCS index [0-76]: %d (0x%02x)\n",
2815 if (WARN_ON(status
->rate_idx
< 0 ||
2816 status
->rate_idx
>= sband
->n_bitrates
))
2818 rate
= &sband
->bitrates
[status
->rate_idx
];
2822 status
->rx_flags
= 0;
2825 * key references and virtual interfaces are protected using RCU
2826 * and this requires that we are in a read-side RCU section during
2827 * receive processing
2832 * Frames with failed FCS/PLCP checksum are not returned,
2833 * all other frames are returned without radiotap header
2834 * if it was previously present.
2835 * Also, frames with less than 16 bytes are dropped.
2837 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2843 __ieee80211_rx_handle_packet(hw
, skb
);
2851 EXPORT_SYMBOL(ieee80211_rx
);
2853 /* This is a version of the rx handler that can be called from hard irq
2854 * context. Post the skb on the queue and schedule the tasklet */
2855 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2857 struct ieee80211_local
*local
= hw_to_local(hw
);
2859 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2861 skb
->pkt_type
= IEEE80211_RX_MSG
;
2862 skb_queue_tail(&local
->skb_queue
, skb
);
2863 tasklet_schedule(&local
->tasklet
);
2865 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);