2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
40 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
41 if (likely(skb
->len
> FCS_LEN
))
42 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
54 static inline int should_drop_frame(struct sk_buff
*skb
,
57 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
58 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
60 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
62 if (unlikely(skb
->len
< 16 + present_fcs_len
))
64 if (ieee80211_is_ctl(hdr
->frame_control
) &&
65 !ieee80211_is_pspoll(hdr
->frame_control
) &&
66 !ieee80211_is_back_req(hdr
->frame_control
))
72 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
73 struct ieee80211_rx_status
*status
)
77 /* always present fields */
78 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
80 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
82 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
85 if (len
& 1) /* padding for RX_FLAGS if necessary */
88 if (status
->flag
& RX_FLAG_HT
) /* HT info */
95 * ieee80211_add_rx_radiotap_header - add radiotap header
97 * add a radiotap header containing all the fields which the hardware provided.
100 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
102 struct ieee80211_rate
*rate
,
105 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
106 struct ieee80211_radiotap_header
*rthdr
;
110 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
111 memset(rthdr
, 0, rtap_len
);
113 /* radiotap header, set always present flags */
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
116 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
119 rthdr
->it_len
= cpu_to_le16(rtap_len
);
121 pos
= (unsigned char *)(rthdr
+1);
123 /* the order of the following fields is important */
125 /* IEEE80211_RADIOTAP_TSFT */
126 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
127 put_unaligned_le64(status
->mactime
, pos
);
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
135 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
136 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
137 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
138 if (status
->flag
& RX_FLAG_SHORTPRE
)
139 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
142 /* IEEE80211_RADIOTAP_RATE */
143 if (!rate
|| status
->flag
& RX_FLAG_HT
) {
145 * Without rate information don't add it. If we have,
146 * MCS information is a separate field in radiotap,
147 * added below. The byte here is needed as padding
148 * for the channel though, so initialise it to 0.
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
&& 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
,
173 put_unaligned_le16(IEEE80211_CHAN_2GHZ
, pos
);
176 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
177 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
178 *pos
= status
->signal
;
180 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
184 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
186 /* IEEE80211_RADIOTAP_ANTENNA */
187 *pos
= status
->antenna
;
190 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
192 /* IEEE80211_RADIOTAP_RX_FLAGS */
193 /* ensure 2 byte alignment for the 2 byte field as required */
194 if ((pos
- (u8
*)rthdr
) & 1)
196 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
197 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
198 put_unaligned_le16(rx_flags
, pos
);
201 if (status
->flag
& RX_FLAG_HT
) {
202 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
203 *pos
++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS
|
204 IEEE80211_RADIOTAP_MCS_HAVE_GI
|
205 IEEE80211_RADIOTAP_MCS_HAVE_BW
;
207 if (status
->flag
& RX_FLAG_SHORT_GI
)
208 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
209 if (status
->flag
& RX_FLAG_40MHZ
)
210 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
212 *pos
++ = status
->rate_idx
;
217 * This function copies a received frame to all monitor interfaces and
218 * returns a cleaned-up SKB that no longer includes the FCS nor the
219 * radiotap header the driver might have added.
221 static struct sk_buff
*
222 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
223 struct ieee80211_rate
*rate
)
225 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
226 struct ieee80211_sub_if_data
*sdata
;
227 int needed_headroom
= 0;
228 struct sk_buff
*skb
, *skb2
;
229 struct net_device
*prev_dev
= NULL
;
230 int present_fcs_len
= 0;
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
241 /* room for the radiotap header based on driver features */
242 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
244 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
245 present_fcs_len
= FCS_LEN
;
247 /* make sure hdr->frame_control is on the linear part */
248 if (!pskb_may_pull(origskb
, 2)) {
249 dev_kfree_skb(origskb
);
253 if (!local
->monitors
) {
254 if (should_drop_frame(origskb
, present_fcs_len
)) {
255 dev_kfree_skb(origskb
);
259 return remove_monitor_info(local
, origskb
);
262 if (should_drop_frame(origskb
, present_fcs_len
)) {
263 /* only need to expand headroom if necessary */
268 * This shouldn't trigger often because most devices have an
269 * RX header they pull before we get here, and that should
270 * be big enough for our radiotap information. We should
271 * probably export the length to drivers so that we can have
272 * them allocate enough headroom to start with.
274 if (skb_headroom(skb
) < needed_headroom
&&
275 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
281 * Need to make a copy and possibly remove radiotap header
282 * and FCS from the original.
284 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
286 origskb
= remove_monitor_info(local
, origskb
);
292 /* prepend radiotap information */
293 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
295 skb_reset_mac_header(skb
);
296 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
297 skb
->pkt_type
= PACKET_OTHERHOST
;
298 skb
->protocol
= htons(ETH_P_802_2
);
300 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
301 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
304 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
307 if (!ieee80211_sdata_running(sdata
))
311 skb2
= skb_clone(skb
, GFP_ATOMIC
);
313 skb2
->dev
= prev_dev
;
314 netif_receive_skb(skb2
);
318 prev_dev
= sdata
->dev
;
319 sdata
->dev
->stats
.rx_packets
++;
320 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
325 netif_receive_skb(skb
);
333 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
335 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
336 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
337 int tid
, seqno_idx
, security_idx
;
339 /* does the frame have a qos control field? */
340 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
341 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
342 /* frame has qos control */
343 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
344 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
345 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
351 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
353 * Sequence numbers for management frames, QoS data
354 * frames with a broadcast/multicast address in the
355 * Address 1 field, and all non-QoS data frames sent
356 * by QoS STAs are assigned using an additional single
357 * modulo-4096 counter, [...]
359 * We also use that counter for non-QoS STAs.
361 seqno_idx
= NUM_RX_DATA_QUEUES
;
363 if (ieee80211_is_mgmt(hdr
->frame_control
))
364 security_idx
= NUM_RX_DATA_QUEUES
;
368 rx
->seqno_idx
= seqno_idx
;
369 rx
->security_idx
= security_idx
;
370 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
371 * For now, set skb->priority to 0 for other cases. */
372 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
376 * DOC: Packet alignment
378 * Drivers always need to pass packets that are aligned to two-byte boundaries
381 * Additionally, should, if possible, align the payload data in a way that
382 * guarantees that the contained IP header is aligned to a four-byte
383 * boundary. In the case of regular frames, this simply means aligning the
384 * payload to a four-byte boundary (because either the IP header is directly
385 * contained, or IV/RFC1042 headers that have a length divisible by four are
386 * in front of it). If the payload data is not properly aligned and the
387 * architecture doesn't support efficient unaligned operations, mac80211
388 * will align the data.
390 * With A-MSDU frames, however, the payload data address must yield two modulo
391 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
392 * push the IP header further back to a multiple of four again. Thankfully, the
393 * specs were sane enough this time around to require padding each A-MSDU
394 * subframe to a length that is a multiple of four.
396 * Padding like Atheros hardware adds which is between the 802.11 header and
397 * the payload is not supported, the driver is required to move the 802.11
398 * header to be directly in front of the payload in that case.
400 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
402 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
403 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
404 "unaligned packet at 0x%p\n", rx
->skb
->data
);
411 static ieee80211_rx_result debug_noinline
412 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
414 struct ieee80211_local
*local
= rx
->local
;
415 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
416 struct sk_buff
*skb
= rx
->skb
;
418 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
419 !local
->sched_scanning
))
422 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
423 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
424 local
->sched_scanning
)
425 return ieee80211_scan_rx(rx
->sdata
, skb
);
427 /* scanning finished during invoking of handlers */
428 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
429 return RX_DROP_UNUSABLE
;
433 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
435 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
437 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
440 return ieee80211_is_robust_mgmt_frame(hdr
);
444 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
446 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
448 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
451 return ieee80211_is_robust_mgmt_frame(hdr
);
455 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
456 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
458 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
459 struct ieee80211_mmie
*mmie
;
461 if (skb
->len
< 24 + sizeof(*mmie
) ||
462 !is_multicast_ether_addr(hdr
->da
))
465 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
466 return -1; /* not a robust management frame */
468 mmie
= (struct ieee80211_mmie
*)
469 (skb
->data
+ skb
->len
- sizeof(*mmie
));
470 if (mmie
->element_id
!= WLAN_EID_MMIE
||
471 mmie
->length
!= sizeof(*mmie
) - 2)
474 return le16_to_cpu(mmie
->key_id
);
478 static ieee80211_rx_result
479 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
481 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
482 char *dev_addr
= rx
->sdata
->vif
.addr
;
484 if (ieee80211_is_data(hdr
->frame_control
)) {
485 if (is_multicast_ether_addr(hdr
->addr1
)) {
486 if (ieee80211_has_tods(hdr
->frame_control
) ||
487 !ieee80211_has_fromds(hdr
->frame_control
))
488 return RX_DROP_MONITOR
;
489 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
490 return RX_DROP_MONITOR
;
492 if (!ieee80211_has_a4(hdr
->frame_control
))
493 return RX_DROP_MONITOR
;
494 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
495 return RX_DROP_MONITOR
;
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
503 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
504 struct ieee80211_mgmt
*mgmt
;
506 if (!ieee80211_is_mgmt(hdr
->frame_control
))
507 return RX_DROP_MONITOR
;
509 if (ieee80211_is_action(hdr
->frame_control
)) {
511 mgmt
= (struct ieee80211_mgmt
*)hdr
;
512 category
= mgmt
->u
.action
.category
;
513 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
514 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
515 return RX_DROP_MONITOR
;
519 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
520 ieee80211_is_probe_resp(hdr
->frame_control
) ||
521 ieee80211_is_beacon(hdr
->frame_control
) ||
522 ieee80211_is_auth(hdr
->frame_control
))
525 return RX_DROP_MONITOR
;
532 #define SEQ_MODULO 0x1000
533 #define SEQ_MASK 0xfff
535 static inline int seq_less(u16 sq1
, u16 sq2
)
537 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
540 static inline u16
seq_inc(u16 sq
)
542 return (sq
+ 1) & SEQ_MASK
;
545 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
547 return (sq1
- sq2
) & SEQ_MASK
;
551 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
552 struct tid_ampdu_rx
*tid_agg_rx
,
555 struct ieee80211_local
*local
= hw_to_local(hw
);
556 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
557 struct ieee80211_rx_status
*status
;
559 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
564 /* release the frame from the reorder ring buffer */
565 tid_agg_rx
->stored_mpdu_num
--;
566 tid_agg_rx
->reorder_buf
[index
] = NULL
;
567 status
= IEEE80211_SKB_RXCB(skb
);
568 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
569 skb_queue_tail(&local
->rx_skb_queue
, skb
);
572 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
575 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
576 struct tid_ampdu_rx
*tid_agg_rx
,
581 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
583 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
584 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
585 tid_agg_rx
->buf_size
;
586 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
591 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
592 * the skb was added to the buffer longer than this time ago, the earlier
593 * frames that have not yet been received are assumed to be lost and the skb
594 * can be released for processing. This may also release other skb's from the
595 * reorder buffer if there are no additional gaps between the frames.
597 * Callers must hold tid_agg_rx->reorder_lock.
599 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
601 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
602 struct tid_ampdu_rx
*tid_agg_rx
)
606 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
608 /* release the buffer until next missing frame */
609 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
610 tid_agg_rx
->buf_size
;
611 if (!tid_agg_rx
->reorder_buf
[index
] &&
612 tid_agg_rx
->stored_mpdu_num
> 1) {
614 * No buffers ready to be released, but check whether any
615 * frames in the reorder buffer have timed out.
618 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
619 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
620 if (!tid_agg_rx
->reorder_buf
[j
]) {
625 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
626 HT_RX_REORDER_BUF_TIMEOUT
))
627 goto set_release_timer
;
629 #ifdef CONFIG_MAC80211_HT_DEBUG
631 wiphy_debug(hw
->wiphy
,
632 "release an RX reorder frame due to timeout on earlier frames\n");
634 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
637 * Increment the head seq# also for the skipped slots.
639 tid_agg_rx
->head_seq_num
=
640 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
643 } else while (tid_agg_rx
->reorder_buf
[index
]) {
644 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
645 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
646 tid_agg_rx
->buf_size
;
649 if (tid_agg_rx
->stored_mpdu_num
) {
650 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
651 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
653 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
654 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
655 if (tid_agg_rx
->reorder_buf
[j
])
661 mod_timer(&tid_agg_rx
->reorder_timer
,
662 tid_agg_rx
->reorder_time
[j
] + 1 +
663 HT_RX_REORDER_BUF_TIMEOUT
);
665 del_timer(&tid_agg_rx
->reorder_timer
);
670 * As this function belongs to the RX path it must be under
671 * rcu_read_lock protection. It returns false if the frame
672 * can be processed immediately, true if it was consumed.
674 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
675 struct tid_ampdu_rx
*tid_agg_rx
,
678 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
679 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
680 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
681 u16 head_seq_num
, buf_size
;
685 spin_lock(&tid_agg_rx
->reorder_lock
);
687 buf_size
= tid_agg_rx
->buf_size
;
688 head_seq_num
= tid_agg_rx
->head_seq_num
;
690 /* frame with out of date sequence number */
691 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
697 * If frame the sequence number exceeds our buffering window
698 * size release some previous frames to make room for this one.
700 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
701 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
702 /* release stored frames up to new head to stack */
703 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
706 /* Now the new frame is always in the range of the reordering buffer */
708 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
710 /* check if we already stored this frame */
711 if (tid_agg_rx
->reorder_buf
[index
]) {
717 * If the current MPDU is in the right order and nothing else
718 * is stored we can process it directly, no need to buffer it.
719 * If it is first but there's something stored, we may be able
720 * to release frames after this one.
722 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
723 tid_agg_rx
->stored_mpdu_num
== 0) {
724 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
729 /* put the frame in the reordering buffer */
730 tid_agg_rx
->reorder_buf
[index
] = skb
;
731 tid_agg_rx
->reorder_time
[index
] = jiffies
;
732 tid_agg_rx
->stored_mpdu_num
++;
733 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
736 spin_unlock(&tid_agg_rx
->reorder_lock
);
741 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
742 * true if the MPDU was buffered, false if it should be processed.
744 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
746 struct sk_buff
*skb
= rx
->skb
;
747 struct ieee80211_local
*local
= rx
->local
;
748 struct ieee80211_hw
*hw
= &local
->hw
;
749 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
750 struct sta_info
*sta
= rx
->sta
;
751 struct tid_ampdu_rx
*tid_agg_rx
;
755 if (!ieee80211_is_data_qos(hdr
->frame_control
))
759 * filter the QoS data rx stream according to
760 * STA/TID and check if this STA/TID is on aggregation
766 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
768 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
772 /* qos null data frames are excluded */
773 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
776 /* new, potentially un-ordered, ampdu frame - process it */
778 /* reset session timer */
779 if (tid_agg_rx
->timeout
)
780 mod_timer(&tid_agg_rx
->session_timer
,
781 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
783 /* if this mpdu is fragmented - terminate rx aggregation session */
784 sc
= le16_to_cpu(hdr
->seq_ctrl
);
785 if (sc
& IEEE80211_SCTL_FRAG
) {
786 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
787 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
788 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
793 * No locking needed -- we will only ever process one
794 * RX packet at a time, and thus own tid_agg_rx. All
795 * other code manipulating it needs to (and does) make
796 * sure that we cannot get to it any more before doing
799 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
803 skb_queue_tail(&local
->rx_skb_queue
, skb
);
806 static ieee80211_rx_result debug_noinline
807 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
809 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
810 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
812 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
813 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
814 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
815 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
817 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
818 rx
->local
->dot11FrameDuplicateCount
++;
819 rx
->sta
->num_duplicates
++;
821 return RX_DROP_UNUSABLE
;
823 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
826 if (unlikely(rx
->skb
->len
< 16)) {
827 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
828 return RX_DROP_MONITOR
;
831 /* Drop disallowed frame classes based on STA auth/assoc state;
832 * IEEE 802.11, Chap 5.5.
834 * mac80211 filters only based on association state, i.e. it drops
835 * Class 3 frames from not associated stations. hostapd sends
836 * deauth/disassoc frames when needed. In addition, hostapd is
837 * responsible for filtering on both auth and assoc states.
840 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
841 return ieee80211_rx_mesh_check(rx
);
843 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
844 ieee80211_is_pspoll(hdr
->frame_control
)) &&
845 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
846 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
847 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
848 if (rx
->sta
&& rx
->sta
->dummy
&&
849 ieee80211_is_data_present(hdr
->frame_control
)) {
853 payload
= rx
->skb
->data
+
854 ieee80211_hdrlen(hdr
->frame_control
);
855 ethertype
= (payload
[6] << 8) | payload
[7];
856 if (cpu_to_be16(ethertype
) ==
857 rx
->sdata
->control_port_protocol
)
860 return RX_DROP_MONITOR
;
867 static ieee80211_rx_result debug_noinline
868 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
870 struct sk_buff
*skb
= rx
->skb
;
871 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
872 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
875 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
876 struct ieee80211_key
*sta_ptk
= NULL
;
877 int mmie_keyidx
= -1;
883 * There are four types of keys:
885 * - IGTK (group keys for management frames)
886 * - PTK (pairwise keys)
887 * - STK (station-to-station pairwise keys)
889 * When selecting a key, we have to distinguish between multicast
890 * (including broadcast) and unicast frames, the latter can only
891 * use PTKs and STKs while the former always use GTKs and IGTKs.
892 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
893 * unicast frames can also use key indices like GTKs. Hence, if we
894 * don't have a PTK/STK we check the key index for a WEP key.
896 * Note that in a regular BSS, multicast frames are sent by the
897 * AP only, associated stations unicast the frame to the AP first
898 * which then multicasts it on their behalf.
900 * There is also a slight problem in IBSS mode: GTKs are negotiated
901 * with each station, that is something we don't currently handle.
902 * The spec seems to expect that one negotiates the same key with
903 * every station but there's no such requirement; VLANs could be
908 * No point in finding a key and decrypting if the frame is neither
909 * addressed to us nor a multicast frame.
911 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
914 /* start without a key */
918 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
920 fc
= hdr
->frame_control
;
922 if (!ieee80211_has_protected(fc
))
923 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
925 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
927 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
928 (status
->flag
& RX_FLAG_IV_STRIPPED
))
930 /* Skip decryption if the frame is not protected. */
931 if (!ieee80211_has_protected(fc
))
933 } else if (mmie_keyidx
>= 0) {
934 /* Broadcast/multicast robust management frame / BIP */
935 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
936 (status
->flag
& RX_FLAG_IV_STRIPPED
))
939 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
940 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
941 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
943 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
945 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
946 } else if (!ieee80211_has_protected(fc
)) {
948 * The frame was not protected, so skip decryption. However, we
949 * need to set rx->key if there is a key that could have been
950 * used so that the frame may be dropped if encryption would
951 * have been expected.
953 struct ieee80211_key
*key
= NULL
;
954 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
957 if (ieee80211_is_mgmt(fc
) &&
958 is_multicast_ether_addr(hdr
->addr1
) &&
959 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
963 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
964 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
970 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
971 key
= rcu_dereference(sdata
->keys
[i
]);
983 * The device doesn't give us the IV so we won't be
984 * able to look up the key. That's ok though, we
985 * don't need to decrypt the frame, we just won't
986 * be able to keep statistics accurate.
987 * Except for key threshold notifications, should
988 * we somehow allow the driver to tell us which key
989 * the hardware used if this flag is set?
991 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
992 (status
->flag
& RX_FLAG_IV_STRIPPED
))
995 hdrlen
= ieee80211_hdrlen(fc
);
997 if (rx
->skb
->len
< 8 + hdrlen
)
998 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1001 * no need to call ieee80211_wep_get_keyidx,
1002 * it verifies a bunch of things we've done already
1004 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1005 keyidx
= keyid
>> 6;
1007 /* check per-station GTK first, if multicast packet */
1008 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1009 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1011 /* if not found, try default key */
1013 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1016 * RSNA-protected unicast frames should always be
1017 * sent with pairwise or station-to-station keys,
1018 * but for WEP we allow using a key index as well.
1021 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1022 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1023 !is_multicast_ether_addr(hdr
->addr1
))
1029 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1030 return RX_DROP_MONITOR
;
1032 rx
->key
->tx_rx_count
++;
1033 /* TODO: add threshold stuff again */
1035 return RX_DROP_MONITOR
;
1038 if (skb_linearize(rx
->skb
))
1039 return RX_DROP_UNUSABLE
;
1040 /* the hdr variable is invalid now! */
1042 switch (rx
->key
->conf
.cipher
) {
1043 case WLAN_CIPHER_SUITE_WEP40
:
1044 case WLAN_CIPHER_SUITE_WEP104
:
1045 /* Check for weak IVs if possible */
1046 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1047 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1048 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1049 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1050 rx
->sta
->wep_weak_iv_count
++;
1052 result
= ieee80211_crypto_wep_decrypt(rx
);
1054 case WLAN_CIPHER_SUITE_TKIP
:
1055 result
= ieee80211_crypto_tkip_decrypt(rx
);
1057 case WLAN_CIPHER_SUITE_CCMP
:
1058 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1060 case WLAN_CIPHER_SUITE_AES_CMAC
:
1061 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1065 * We can reach here only with HW-only algorithms
1066 * but why didn't it decrypt the frame?!
1068 return RX_DROP_UNUSABLE
;
1071 /* either the frame has been decrypted or will be dropped */
1072 status
->flag
|= RX_FLAG_DECRYPTED
;
1077 static ieee80211_rx_result debug_noinline
1078 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1080 struct ieee80211_local
*local
;
1081 struct ieee80211_hdr
*hdr
;
1082 struct sk_buff
*skb
;
1086 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1088 if (!local
->pspolling
)
1091 if (!ieee80211_has_fromds(hdr
->frame_control
))
1092 /* this is not from AP */
1095 if (!ieee80211_is_data(hdr
->frame_control
))
1098 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1099 /* AP has no more frames buffered for us */
1100 local
->pspolling
= false;
1104 /* more data bit is set, let's request a new frame from the AP */
1105 ieee80211_send_pspoll(local
, rx
->sdata
);
1110 static void ap_sta_ps_start(struct sta_info
*sta
)
1112 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1113 struct ieee80211_local
*local
= sdata
->local
;
1115 atomic_inc(&sdata
->bss
->num_sta_ps
);
1116 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1117 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1118 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1119 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1120 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1121 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1122 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1125 static void ap_sta_ps_end(struct sta_info
*sta
)
1127 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1129 atomic_dec(&sdata
->bss
->num_sta_ps
);
1131 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1132 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1133 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1134 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1136 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1137 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1138 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1139 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1140 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144 ieee80211_sta_ps_deliver_wakeup(sta
);
1147 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1149 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1152 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1154 /* Don't let the same PS state be set twice */
1155 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1156 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1160 ap_sta_ps_start(sta_inf
);
1162 ap_sta_ps_end(sta_inf
);
1166 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1168 static ieee80211_rx_result debug_noinline
1169 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1171 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1172 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1173 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1176 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1179 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1180 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1184 * The device handles station powersave, so don't do anything about
1185 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1186 * it to mac80211 since they're handled.)
1188 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1192 * Don't do anything if the station isn't already asleep. In
1193 * the uAPSD case, the station will probably be marked asleep,
1194 * in the PS-Poll case the station must be confused ...
1196 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1199 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1200 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1201 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1202 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1204 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1207 /* Free PS Poll skb here instead of returning RX_DROP that would
1208 * count as an dropped frame. */
1209 dev_kfree_skb(rx
->skb
);
1212 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1213 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1214 ieee80211_has_pm(hdr
->frame_control
) &&
1215 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1216 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1217 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1218 ac
= ieee802_1d_to_ac
[tid
& 7];
1221 * If this AC is not trigger-enabled do nothing.
1223 * NB: This could/should check a separate bitmap of trigger-
1224 * enabled queues, but for now we only implement uAPSD w/o
1225 * TSPEC changes to the ACs, so they're always the same.
1227 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1230 /* if we are in a service period, do nothing */
1231 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1234 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1235 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1237 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1243 static ieee80211_rx_result debug_noinline
1244 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1246 struct sta_info
*sta
= rx
->sta
;
1247 struct sk_buff
*skb
= rx
->skb
;
1248 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1249 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1255 * Update last_rx only for IBSS packets which are for the current
1256 * BSSID to avoid keeping the current IBSS network alive in cases
1257 * where other STAs start using different BSSID.
1259 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1260 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1261 NL80211_IFTYPE_ADHOC
);
1262 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1263 sta
->last_rx
= jiffies
;
1264 if (ieee80211_is_data(hdr
->frame_control
)) {
1265 sta
->last_rx_rate_idx
= status
->rate_idx
;
1266 sta
->last_rx_rate_flag
= status
->flag
;
1269 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1271 * Mesh beacons will update last_rx when if they are found to
1272 * match the current local configuration when processed.
1274 sta
->last_rx
= jiffies
;
1275 if (ieee80211_is_data(hdr
->frame_control
)) {
1276 sta
->last_rx_rate_idx
= status
->rate_idx
;
1277 sta
->last_rx_rate_flag
= status
->flag
;
1281 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1284 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1285 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1287 sta
->rx_fragments
++;
1288 sta
->rx_bytes
+= rx
->skb
->len
;
1289 sta
->last_signal
= status
->signal
;
1290 ewma_add(&sta
->avg_signal
, -status
->signal
);
1293 * Change STA power saving mode only at the end of a frame
1294 * exchange sequence.
1296 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1297 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1298 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1299 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1300 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1301 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1303 * Ignore doze->wake transitions that are
1304 * indicated by non-data frames, the standard
1305 * is unclear here, but for example going to
1306 * PS mode and then scanning would cause a
1307 * doze->wake transition for the probe request,
1308 * and that is clearly undesirable.
1310 if (ieee80211_is_data(hdr
->frame_control
) &&
1311 !ieee80211_has_pm(hdr
->frame_control
))
1314 if (ieee80211_has_pm(hdr
->frame_control
))
1315 ap_sta_ps_start(sta
);
1320 * Drop (qos-)data::nullfunc frames silently, since they
1321 * are used only to control station power saving mode.
1323 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1324 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1325 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1328 * If we receive a 4-addr nullfunc frame from a STA
1329 * that was not moved to a 4-addr STA vlan yet, drop
1330 * the frame to the monitor interface, to make sure
1331 * that hostapd sees it
1333 if (ieee80211_has_a4(hdr
->frame_control
) &&
1334 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1335 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1336 !rx
->sdata
->u
.vlan
.sta
)))
1337 return RX_DROP_MONITOR
;
1339 * Update counter and free packet here to avoid
1340 * counting this as a dropped packed.
1343 dev_kfree_skb(rx
->skb
);
1348 } /* ieee80211_rx_h_sta_process */
1350 static inline struct ieee80211_fragment_entry
*
1351 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1352 unsigned int frag
, unsigned int seq
, int rx_queue
,
1353 struct sk_buff
**skb
)
1355 struct ieee80211_fragment_entry
*entry
;
1358 idx
= sdata
->fragment_next
;
1359 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1360 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1361 sdata
->fragment_next
= 0;
1363 if (!skb_queue_empty(&entry
->skb_list
)) {
1364 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1365 struct ieee80211_hdr
*hdr
=
1366 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1367 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1368 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1369 "addr1=%pM addr2=%pM\n",
1371 jiffies
- entry
->first_frag_time
, entry
->seq
,
1372 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1374 __skb_queue_purge(&entry
->skb_list
);
1377 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1379 entry
->first_frag_time
= jiffies
;
1381 entry
->rx_queue
= rx_queue
;
1382 entry
->last_frag
= frag
;
1384 entry
->extra_len
= 0;
1389 static inline struct ieee80211_fragment_entry
*
1390 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1391 unsigned int frag
, unsigned int seq
,
1392 int rx_queue
, struct ieee80211_hdr
*hdr
)
1394 struct ieee80211_fragment_entry
*entry
;
1397 idx
= sdata
->fragment_next
;
1398 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1399 struct ieee80211_hdr
*f_hdr
;
1403 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1405 entry
= &sdata
->fragments
[idx
];
1406 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1407 entry
->rx_queue
!= rx_queue
||
1408 entry
->last_frag
+ 1 != frag
)
1411 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1414 * Check ftype and addresses are equal, else check next fragment
1416 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1417 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1418 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1419 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1422 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1423 __skb_queue_purge(&entry
->skb_list
);
1432 static ieee80211_rx_result debug_noinline
1433 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1435 struct ieee80211_hdr
*hdr
;
1438 unsigned int frag
, seq
;
1439 struct ieee80211_fragment_entry
*entry
;
1440 struct sk_buff
*skb
;
1441 struct ieee80211_rx_status
*status
;
1443 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1444 fc
= hdr
->frame_control
;
1445 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1446 frag
= sc
& IEEE80211_SCTL_FRAG
;
1448 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1449 (rx
->skb
)->len
< 24 ||
1450 is_multicast_ether_addr(hdr
->addr1
))) {
1451 /* not fragmented */
1454 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1456 if (skb_linearize(rx
->skb
))
1457 return RX_DROP_UNUSABLE
;
1460 * skb_linearize() might change the skb->data and
1461 * previously cached variables (in this case, hdr) need to
1462 * be refreshed with the new data.
1464 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1465 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1468 /* This is the first fragment of a new frame. */
1469 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1470 rx
->seqno_idx
, &(rx
->skb
));
1471 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1472 ieee80211_has_protected(fc
)) {
1473 int queue
= rx
->security_idx
;
1474 /* Store CCMP PN so that we can verify that the next
1475 * fragment has a sequential PN value. */
1477 memcpy(entry
->last_pn
,
1478 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1484 /* This is a fragment for a frame that should already be pending in
1485 * fragment cache. Add this fragment to the end of the pending entry.
1487 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1488 rx
->seqno_idx
, hdr
);
1490 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1491 return RX_DROP_MONITOR
;
1494 /* Verify that MPDUs within one MSDU have sequential PN values.
1495 * (IEEE 802.11i, 8.3.3.4.5) */
1498 u8 pn
[CCMP_PN_LEN
], *rpn
;
1500 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1501 return RX_DROP_UNUSABLE
;
1502 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1503 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1508 queue
= rx
->security_idx
;
1509 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1510 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1511 return RX_DROP_UNUSABLE
;
1512 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1515 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1516 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1517 entry
->last_frag
= frag
;
1518 entry
->extra_len
+= rx
->skb
->len
;
1519 if (ieee80211_has_morefrags(fc
)) {
1524 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1525 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1526 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1527 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1529 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1530 __skb_queue_purge(&entry
->skb_list
);
1531 return RX_DROP_UNUSABLE
;
1534 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1535 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1539 /* Complete frame has been reassembled - process it now */
1540 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1541 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1545 rx
->sta
->rx_packets
++;
1546 if (is_multicast_ether_addr(hdr
->addr1
))
1547 rx
->local
->dot11MulticastReceivedFrameCount
++;
1549 ieee80211_led_rx(rx
->local
);
1553 static ieee80211_rx_result debug_noinline
1554 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1556 u8
*data
= rx
->skb
->data
;
1557 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1559 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1562 /* remove the qos control field, update frame type and meta-data */
1563 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1564 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1565 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1566 /* change frame type to non QOS */
1567 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1573 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1575 if (unlikely(!rx
->sta
||
1576 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1583 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1585 struct sk_buff
*skb
= rx
->skb
;
1586 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1589 * Pass through unencrypted frames if the hardware has
1590 * decrypted them already.
1592 if (status
->flag
& RX_FLAG_DECRYPTED
)
1595 /* Drop unencrypted frames if key is set. */
1596 if (unlikely(!ieee80211_has_protected(fc
) &&
1597 !ieee80211_is_nullfunc(fc
) &&
1598 ieee80211_is_data(fc
) &&
1599 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1606 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1608 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1609 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1610 __le16 fc
= hdr
->frame_control
;
1613 * Pass through unencrypted frames if the hardware has
1614 * decrypted them already.
1616 if (status
->flag
& RX_FLAG_DECRYPTED
)
1619 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1620 if (unlikely(!ieee80211_has_protected(fc
) &&
1621 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1623 if (ieee80211_is_deauth(fc
))
1624 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1627 else if (ieee80211_is_disassoc(fc
))
1628 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1633 /* BIP does not use Protected field, so need to check MMIE */
1634 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1635 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1636 if (ieee80211_is_deauth(fc
))
1637 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1640 else if (ieee80211_is_disassoc(fc
))
1641 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1647 * When using MFP, Action frames are not allowed prior to
1648 * having configured keys.
1650 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1651 ieee80211_is_robust_mgmt_frame(
1652 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1660 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1662 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1663 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1664 bool check_port_control
= false;
1665 struct ethhdr
*ehdr
;
1668 *port_control
= false;
1669 if (ieee80211_has_a4(hdr
->frame_control
) &&
1670 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1673 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1674 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1676 if (!sdata
->u
.mgd
.use_4addr
)
1679 check_port_control
= true;
1682 if (is_multicast_ether_addr(hdr
->addr1
) &&
1683 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1686 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1690 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1691 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1692 *port_control
= true;
1693 else if (check_port_control
)
1700 * requires that rx->skb is a frame with ethernet header
1702 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1704 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1705 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1706 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1709 * Allow EAPOL frames to us/the PAE group address regardless
1710 * of whether the frame was encrypted or not.
1712 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1713 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1714 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1717 if (ieee80211_802_1x_port_control(rx
) ||
1718 ieee80211_drop_unencrypted(rx
, fc
))
1725 * requires that rx->skb is a frame with ethernet header
1728 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1730 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1731 struct net_device
*dev
= sdata
->dev
;
1732 struct sk_buff
*skb
, *xmit_skb
;
1733 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1734 struct sta_info
*dsta
;
1735 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1740 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1741 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1742 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1743 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1744 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1745 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1747 * send multicast frames both to higher layers in
1748 * local net stack and back to the wireless medium
1750 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1751 if (!xmit_skb
&& net_ratelimit())
1752 printk(KERN_DEBUG
"%s: failed to clone "
1753 "multicast frame\n", dev
->name
);
1755 dsta
= sta_info_get(sdata
, skb
->data
);
1758 * The destination station is associated to
1759 * this AP (in this VLAN), so send the frame
1760 * directly to it and do not pass it to local
1770 int align __maybe_unused
;
1772 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1774 * 'align' will only take the values 0 or 2 here
1775 * since all frames are required to be aligned
1776 * to 2-byte boundaries when being passed to
1777 * mac80211. That also explains the __skb_push()
1780 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1782 if (WARN_ON(skb_headroom(skb
) < 3)) {
1786 u8
*data
= skb
->data
;
1787 size_t len
= skb_headlen(skb
);
1789 memmove(skb
->data
, data
, len
);
1790 skb_set_tail_pointer(skb
, len
);
1796 /* deliver to local stack */
1797 skb
->protocol
= eth_type_trans(skb
, dev
);
1798 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1799 netif_receive_skb(skb
);
1804 /* send to wireless media */
1805 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1806 skb_reset_network_header(xmit_skb
);
1807 skb_reset_mac_header(xmit_skb
);
1808 dev_queue_xmit(xmit_skb
);
1812 static ieee80211_rx_result debug_noinline
1813 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1815 struct net_device
*dev
= rx
->sdata
->dev
;
1816 struct sk_buff
*skb
= rx
->skb
;
1817 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1818 __le16 fc
= hdr
->frame_control
;
1819 struct sk_buff_head frame_list
;
1820 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1822 if (unlikely(!ieee80211_is_data(fc
)))
1825 if (unlikely(!ieee80211_is_data_present(fc
)))
1826 return RX_DROP_MONITOR
;
1828 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1831 if (ieee80211_has_a4(hdr
->frame_control
) &&
1832 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1833 !rx
->sdata
->u
.vlan
.sta
)
1834 return RX_DROP_UNUSABLE
;
1836 if (is_multicast_ether_addr(hdr
->addr1
) &&
1837 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1838 rx
->sdata
->u
.vlan
.sta
) ||
1839 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1840 rx
->sdata
->u
.mgd
.use_4addr
)))
1841 return RX_DROP_UNUSABLE
;
1844 __skb_queue_head_init(&frame_list
);
1846 if (skb_linearize(skb
))
1847 return RX_DROP_UNUSABLE
;
1849 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1850 rx
->sdata
->vif
.type
,
1851 rx
->local
->hw
.extra_tx_headroom
, true);
1853 while (!skb_queue_empty(&frame_list
)) {
1854 rx
->skb
= __skb_dequeue(&frame_list
);
1856 if (!ieee80211_frame_allowed(rx
, fc
)) {
1857 dev_kfree_skb(rx
->skb
);
1860 dev
->stats
.rx_packets
++;
1861 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1863 ieee80211_deliver_skb(rx
);
1869 #ifdef CONFIG_MAC80211_MESH
1870 static ieee80211_rx_result
1871 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1873 struct ieee80211_hdr
*hdr
;
1874 struct ieee80211s_hdr
*mesh_hdr
;
1875 unsigned int hdrlen
;
1876 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1877 struct ieee80211_local
*local
= rx
->local
;
1878 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1879 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1881 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1882 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1883 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1885 /* frame is in RMC, don't forward */
1886 if (ieee80211_is_data(hdr
->frame_control
) &&
1887 is_multicast_ether_addr(hdr
->addr1
) &&
1888 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1889 return RX_DROP_MONITOR
;
1891 if (!ieee80211_is_data(hdr
->frame_control
))
1896 return RX_DROP_MONITOR
;
1898 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1899 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1900 dropped_frames_congestion
);
1901 return RX_DROP_MONITOR
;
1904 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1905 struct mesh_path
*mppath
;
1909 if (is_multicast_ether_addr(hdr
->addr1
)) {
1910 mpp_addr
= hdr
->addr3
;
1911 proxied_addr
= mesh_hdr
->eaddr1
;
1913 mpp_addr
= hdr
->addr4
;
1914 proxied_addr
= mesh_hdr
->eaddr2
;
1918 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1920 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1922 spin_lock_bh(&mppath
->state_lock
);
1923 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1924 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1925 spin_unlock_bh(&mppath
->state_lock
);
1930 /* Frame has reached destination. Don't forward */
1931 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1932 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1937 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1939 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1940 dropped_frames_ttl
);
1942 struct ieee80211_hdr
*fwd_hdr
;
1943 struct ieee80211_tx_info
*info
;
1945 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1947 if (!fwd_skb
&& net_ratelimit())
1948 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1953 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1954 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1955 info
= IEEE80211_SKB_CB(fwd_skb
);
1956 memset(info
, 0, sizeof(*info
));
1957 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1958 info
->control
.vif
= &rx
->sdata
->vif
;
1959 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1960 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1962 skb_set_queue_mapping(fwd_skb
,
1963 ieee80211_select_queue(sdata
, fwd_skb
));
1964 ieee80211_set_qos_hdr(sdata
, fwd_skb
);
1968 * Save TA to addr1 to send TA a path error if a
1969 * suitable next hop is not found
1971 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1973 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1974 /* Failed to immediately resolve next hop:
1975 * fwded frame was dropped or will be added
1976 * later to the pending skb queue. */
1978 return RX_DROP_MONITOR
;
1980 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1983 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1985 ieee80211_add_pending_skb(local
, fwd_skb
);
1990 if (is_multicast_ether_addr(hdr
->addr1
) ||
1991 sdata
->dev
->flags
& IFF_PROMISC
)
1994 return RX_DROP_MONITOR
;
1998 static ieee80211_rx_result debug_noinline
1999 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2001 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2002 struct ieee80211_local
*local
= rx
->local
;
2003 struct net_device
*dev
= sdata
->dev
;
2004 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2005 __le16 fc
= hdr
->frame_control
;
2009 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2012 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2013 return RX_DROP_MONITOR
;
2016 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2017 * that a 4-addr station can be detected and moved into a separate VLAN
2019 if (ieee80211_has_a4(hdr
->frame_control
) &&
2020 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2021 return RX_DROP_MONITOR
;
2023 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2025 return RX_DROP_UNUSABLE
;
2027 if (!ieee80211_frame_allowed(rx
, fc
))
2028 return RX_DROP_MONITOR
;
2030 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2031 unlikely(port_control
) && sdata
->bss
) {
2032 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2040 dev
->stats
.rx_packets
++;
2041 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2043 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2044 !is_multicast_ether_addr(
2045 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2046 (!local
->scanning
&&
2047 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2048 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2049 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2052 ieee80211_deliver_skb(rx
);
2057 static ieee80211_rx_result debug_noinline
2058 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2060 struct ieee80211_local
*local
= rx
->local
;
2061 struct ieee80211_hw
*hw
= &local
->hw
;
2062 struct sk_buff
*skb
= rx
->skb
;
2063 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2064 struct tid_ampdu_rx
*tid_agg_rx
;
2068 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2071 if (ieee80211_is_back_req(bar
->frame_control
)) {
2073 __le16 control
, start_seq_num
;
2074 } __packed bar_data
;
2077 return RX_DROP_MONITOR
;
2079 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2080 &bar_data
, sizeof(bar_data
)))
2081 return RX_DROP_MONITOR
;
2083 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2085 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2087 return RX_DROP_MONITOR
;
2089 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2091 /* reset session timer */
2092 if (tid_agg_rx
->timeout
)
2093 mod_timer(&tid_agg_rx
->session_timer
,
2094 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2096 spin_lock(&tid_agg_rx
->reorder_lock
);
2097 /* release stored frames up to start of BAR */
2098 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2099 spin_unlock(&tid_agg_rx
->reorder_lock
);
2106 * After this point, we only want management frames,
2107 * so we can drop all remaining control frames to
2108 * cooked monitor interfaces.
2110 return RX_DROP_MONITOR
;
2113 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2114 struct ieee80211_mgmt
*mgmt
,
2117 struct ieee80211_local
*local
= sdata
->local
;
2118 struct sk_buff
*skb
;
2119 struct ieee80211_mgmt
*resp
;
2121 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2122 /* Not to own unicast address */
2126 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2127 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2128 /* Not from the current AP or not associated yet. */
2132 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2133 /* Too short SA Query request frame */
2137 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2141 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2142 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2143 memset(resp
, 0, 24);
2144 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2145 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2146 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2147 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2148 IEEE80211_STYPE_ACTION
);
2149 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2150 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2151 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2152 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2153 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2154 WLAN_SA_QUERY_TR_ID_LEN
);
2156 ieee80211_tx_skb(sdata
, skb
);
2159 static ieee80211_rx_result debug_noinline
2160 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2162 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2163 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2166 * From here on, look only at management frames.
2167 * Data and control frames are already handled,
2168 * and unknown (reserved) frames are useless.
2170 if (rx
->skb
->len
< 24)
2171 return RX_DROP_MONITOR
;
2173 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2174 return RX_DROP_MONITOR
;
2176 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2177 return RX_DROP_MONITOR
;
2179 if (ieee80211_drop_unencrypted_mgmt(rx
))
2180 return RX_DROP_UNUSABLE
;
2185 static ieee80211_rx_result debug_noinline
2186 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2188 struct ieee80211_local
*local
= rx
->local
;
2189 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2190 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2191 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2192 int len
= rx
->skb
->len
;
2194 if (!ieee80211_is_action(mgmt
->frame_control
))
2197 /* drop too small frames */
2198 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2199 return RX_DROP_UNUSABLE
;
2201 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2202 return RX_DROP_UNUSABLE
;
2204 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2205 return RX_DROP_UNUSABLE
;
2207 switch (mgmt
->u
.action
.category
) {
2208 case WLAN_CATEGORY_BACK
:
2210 * The aggregation code is not prepared to handle
2211 * anything but STA/AP due to the BSSID handling;
2212 * IBSS could work in the code but isn't supported
2213 * by drivers or the standard.
2215 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2216 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2217 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2220 /* verify action_code is present */
2221 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2224 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2225 case WLAN_ACTION_ADDBA_REQ
:
2226 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2227 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2230 case WLAN_ACTION_ADDBA_RESP
:
2231 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2232 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2235 case WLAN_ACTION_DELBA
:
2236 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2237 sizeof(mgmt
->u
.action
.u
.delba
)))
2245 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2246 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2249 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2252 /* verify action_code is present */
2253 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2256 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2257 case WLAN_ACTION_SPCT_MSR_REQ
:
2258 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2259 sizeof(mgmt
->u
.action
.u
.measurement
)))
2261 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2263 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2264 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2265 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2268 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2271 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2277 case WLAN_CATEGORY_SA_QUERY
:
2278 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2279 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2282 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2283 case WLAN_ACTION_SA_QUERY_REQUEST
:
2284 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2286 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2290 case WLAN_CATEGORY_SELF_PROTECTED
:
2291 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2292 case WLAN_SP_MESH_PEERING_OPEN
:
2293 case WLAN_SP_MESH_PEERING_CLOSE
:
2294 case WLAN_SP_MESH_PEERING_CONFIRM
:
2295 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2297 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2298 /* userspace handles this frame */
2301 case WLAN_SP_MGK_INFORM
:
2302 case WLAN_SP_MGK_ACK
:
2303 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2308 case WLAN_CATEGORY_MESH_ACTION
:
2309 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2311 if (mesh_action_is_path_sel(mgmt
) &&
2312 (!mesh_path_sel_is_hwmp(sdata
)))
2320 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2321 /* will return in the next handlers */
2326 rx
->sta
->rx_packets
++;
2327 dev_kfree_skb(rx
->skb
);
2331 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2332 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2333 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2335 rx
->sta
->rx_packets
++;
2339 static ieee80211_rx_result debug_noinline
2340 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2342 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2344 /* skip known-bad action frames and return them in the next handler */
2345 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2349 * Getting here means the kernel doesn't know how to handle
2350 * it, but maybe userspace does ... include returned frames
2351 * so userspace can register for those to know whether ones
2352 * it transmitted were processed or returned.
2355 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2356 rx
->skb
->data
, rx
->skb
->len
,
2359 rx
->sta
->rx_packets
++;
2360 dev_kfree_skb(rx
->skb
);
2368 static ieee80211_rx_result debug_noinline
2369 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2371 struct ieee80211_local
*local
= rx
->local
;
2372 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2373 struct sk_buff
*nskb
;
2374 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2375 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2377 if (!ieee80211_is_action(mgmt
->frame_control
))
2381 * For AP mode, hostapd is responsible for handling any action
2382 * frames that we didn't handle, including returning unknown
2383 * ones. For all other modes we will return them to the sender,
2384 * setting the 0x80 bit in the action category, as required by
2385 * 802.11-2007 7.3.1.11.
2386 * Newer versions of hostapd shall also use the management frame
2387 * registration mechanisms, but older ones still use cooked
2388 * monitor interfaces so push all frames there.
2390 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2391 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2392 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2393 return RX_DROP_MONITOR
;
2395 /* do not return rejected action frames */
2396 if (mgmt
->u
.action
.category
& 0x80)
2397 return RX_DROP_UNUSABLE
;
2399 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2402 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2404 nmgmt
->u
.action
.category
|= 0x80;
2405 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2406 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2408 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2410 ieee80211_tx_skb(rx
->sdata
, nskb
);
2412 dev_kfree_skb(rx
->skb
);
2416 static ieee80211_rx_result debug_noinline
2417 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2419 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2420 ieee80211_rx_result rxs
;
2421 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2424 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2425 if (rxs
!= RX_CONTINUE
)
2428 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2430 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2431 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2432 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2433 return RX_DROP_MONITOR
;
2436 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2437 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2438 /* process for all: mesh, mlme, ibss */
2440 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2441 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2442 if (is_multicast_ether_addr(mgmt
->da
) &&
2443 !is_broadcast_ether_addr(mgmt
->da
))
2444 return RX_DROP_MONITOR
;
2446 /* process only for station */
2447 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2448 return RX_DROP_MONITOR
;
2450 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2451 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2452 /* process only for ibss */
2453 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2454 return RX_DROP_MONITOR
;
2457 return RX_DROP_MONITOR
;
2460 /* queue up frame and kick off work to process it */
2461 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2462 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2463 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2465 rx
->sta
->rx_packets
++;
2470 /* TODO: use IEEE80211_RX_FRAGMENTED */
2471 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2472 struct ieee80211_rate
*rate
)
2474 struct ieee80211_sub_if_data
*sdata
;
2475 struct ieee80211_local
*local
= rx
->local
;
2476 struct ieee80211_rtap_hdr
{
2477 struct ieee80211_radiotap_header hdr
;
2483 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2484 struct net_device
*prev_dev
= NULL
;
2485 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2488 * If cooked monitor has been processed already, then
2489 * don't do it again. If not, set the flag.
2491 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2493 rx
->flags
|= IEEE80211_RX_CMNTR
;
2495 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2496 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2499 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2500 memset(rthdr
, 0, sizeof(*rthdr
));
2501 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2502 rthdr
->hdr
.it_present
=
2503 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2504 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2507 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2508 rthdr
->hdr
.it_present
|=
2509 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2511 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2513 if (status
->band
== IEEE80211_BAND_5GHZ
)
2514 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2515 IEEE80211_CHAN_5GHZ
);
2517 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2518 IEEE80211_CHAN_2GHZ
);
2520 skb_set_mac_header(skb
, 0);
2521 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2522 skb
->pkt_type
= PACKET_OTHERHOST
;
2523 skb
->protocol
= htons(ETH_P_802_2
);
2525 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2526 if (!ieee80211_sdata_running(sdata
))
2529 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2530 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2534 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2536 skb2
->dev
= prev_dev
;
2537 netif_receive_skb(skb2
);
2541 prev_dev
= sdata
->dev
;
2542 sdata
->dev
->stats
.rx_packets
++;
2543 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2547 skb
->dev
= prev_dev
;
2548 netif_receive_skb(skb
);
2556 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2557 ieee80211_rx_result res
)
2560 case RX_DROP_MONITOR
:
2561 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2563 rx
->sta
->rx_dropped
++;
2566 struct ieee80211_rate
*rate
= NULL
;
2567 struct ieee80211_supported_band
*sband
;
2568 struct ieee80211_rx_status
*status
;
2570 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2572 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2573 if (!(status
->flag
& RX_FLAG_HT
))
2574 rate
= &sband
->bitrates
[status
->rate_idx
];
2576 ieee80211_rx_cooked_monitor(rx
, rate
);
2579 case RX_DROP_UNUSABLE
:
2580 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2582 rx
->sta
->rx_dropped
++;
2583 dev_kfree_skb(rx
->skb
);
2586 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2591 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2593 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2594 struct sk_buff
*skb
;
2596 #define CALL_RXH(rxh) \
2599 if (res != RX_CONTINUE) \
2603 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2604 if (rx
->local
->running_rx_handler
)
2607 rx
->local
->running_rx_handler
= true;
2609 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2610 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2613 * all the other fields are valid across frames
2614 * that belong to an aMPDU since they are on the
2615 * same TID from the same station
2619 CALL_RXH(ieee80211_rx_h_decrypt
)
2620 CALL_RXH(ieee80211_rx_h_check_more_data
)
2621 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2622 CALL_RXH(ieee80211_rx_h_sta_process
)
2623 CALL_RXH(ieee80211_rx_h_defragment
)
2624 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2625 /* must be after MMIC verify so header is counted in MPDU mic */
2626 #ifdef CONFIG_MAC80211_MESH
2627 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2628 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2630 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2631 CALL_RXH(ieee80211_rx_h_amsdu
)
2632 CALL_RXH(ieee80211_rx_h_data
)
2633 CALL_RXH(ieee80211_rx_h_ctrl
);
2634 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2635 CALL_RXH(ieee80211_rx_h_action
)
2636 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2637 CALL_RXH(ieee80211_rx_h_action_return
)
2638 CALL_RXH(ieee80211_rx_h_mgmt
)
2641 ieee80211_rx_handlers_result(rx
, res
);
2642 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2646 rx
->local
->running_rx_handler
= false;
2649 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2652 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2654 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2656 #define CALL_RXH(rxh) \
2659 if (res != RX_CONTINUE) \
2663 CALL_RXH(ieee80211_rx_h_passive_scan
)
2664 CALL_RXH(ieee80211_rx_h_check
)
2666 ieee80211_rx_reorder_ampdu(rx
);
2668 ieee80211_rx_handlers(rx
);
2672 ieee80211_rx_handlers_result(rx
, res
);
2678 * This function makes calls into the RX path, therefore
2679 * it has to be invoked under RCU read lock.
2681 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2683 struct ieee80211_rx_data rx
= {
2685 .sdata
= sta
->sdata
,
2686 .local
= sta
->local
,
2687 /* This is OK -- must be QoS data frame */
2688 .security_idx
= tid
,
2692 struct tid_ampdu_rx
*tid_agg_rx
;
2694 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2698 spin_lock(&tid_agg_rx
->reorder_lock
);
2699 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2700 spin_unlock(&tid_agg_rx
->reorder_lock
);
2702 ieee80211_rx_handlers(&rx
);
2705 /* main receive path */
2707 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2708 struct ieee80211_hdr
*hdr
)
2710 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2711 struct sk_buff
*skb
= rx
->skb
;
2712 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2713 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2714 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2716 switch (sdata
->vif
.type
) {
2717 case NL80211_IFTYPE_STATION
:
2718 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2721 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2722 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2723 sdata
->u
.mgd
.use_4addr
)
2725 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2728 case NL80211_IFTYPE_ADHOC
:
2731 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2734 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2735 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2737 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2738 } else if (!multicast
&&
2739 compare_ether_addr(sdata
->vif
.addr
,
2741 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2743 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2744 } else if (!rx
->sta
) {
2746 if (status
->flag
& RX_FLAG_HT
)
2747 rate_idx
= 0; /* TODO: HT rates */
2749 rate_idx
= status
->rate_idx
;
2750 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2751 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2754 case NL80211_IFTYPE_MESH_POINT
:
2756 compare_ether_addr(sdata
->vif
.addr
,
2758 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2761 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2764 case NL80211_IFTYPE_AP_VLAN
:
2765 case NL80211_IFTYPE_AP
:
2767 if (compare_ether_addr(sdata
->vif
.addr
,
2770 } else if (!ieee80211_bssid_match(bssid
,
2772 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2773 !ieee80211_is_beacon(hdr
->frame_control
) &&
2774 !(ieee80211_is_action(hdr
->frame_control
) &&
2777 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2780 case NL80211_IFTYPE_WDS
:
2781 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2783 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2787 /* should never get here */
2796 * This function returns whether or not the SKB
2797 * was destined for RX processing or not, which,
2798 * if consume is true, is equivalent to whether
2799 * or not the skb was consumed.
2801 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2802 struct sk_buff
*skb
, bool consume
)
2804 struct ieee80211_local
*local
= rx
->local
;
2805 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2806 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2807 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2811 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2812 prepares
= prepare_for_handlers(rx
, hdr
);
2818 skb
= skb_copy(skb
, GFP_ATOMIC
);
2820 if (net_ratelimit())
2821 wiphy_debug(local
->hw
.wiphy
,
2822 "failed to copy skb for %s\n",
2830 ieee80211_invoke_rx_handlers(rx
);
2835 * This is the actual Rx frames handler. as it blongs to Rx path it must
2836 * be called with rcu_read_lock protection.
2838 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2839 struct sk_buff
*skb
)
2841 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2842 struct ieee80211_local
*local
= hw_to_local(hw
);
2843 struct ieee80211_sub_if_data
*sdata
;
2844 struct ieee80211_hdr
*hdr
;
2846 struct ieee80211_rx_data rx
;
2847 struct ieee80211_sub_if_data
*prev
;
2848 struct sta_info
*sta
, *tmp
, *prev_sta
;
2851 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2852 memset(&rx
, 0, sizeof(rx
));
2856 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2857 local
->dot11ReceivedFragmentCount
++;
2859 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2860 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2861 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2863 if (ieee80211_is_mgmt(fc
))
2864 err
= skb_linearize(skb
);
2866 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2873 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2874 ieee80211_parse_qos(&rx
);
2875 ieee80211_verify_alignment(&rx
);
2877 if (ieee80211_is_data(fc
)) {
2880 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2887 rx
.sdata
= prev_sta
->sdata
;
2888 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2895 rx
.sdata
= prev_sta
->sdata
;
2897 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2905 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2906 if (!ieee80211_sdata_running(sdata
))
2909 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2910 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2914 * frame is destined for this interface, but if it's
2915 * not also for the previous one we handle that after
2916 * the loop to avoid copying the SKB once too much
2924 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2926 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2932 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2935 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2944 * This is the receive path handler. It is called by a low level driver when an
2945 * 802.11 MPDU is received from the hardware.
2947 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2949 struct ieee80211_local
*local
= hw_to_local(hw
);
2950 struct ieee80211_rate
*rate
= NULL
;
2951 struct ieee80211_supported_band
*sband
;
2952 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2954 WARN_ON_ONCE(softirq_count() == 0);
2956 if (WARN_ON(status
->band
< 0 ||
2957 status
->band
>= IEEE80211_NUM_BANDS
))
2960 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2961 if (WARN_ON(!sband
))
2965 * If we're suspending, it is possible although not too likely
2966 * that we'd be receiving frames after having already partially
2967 * quiesced the stack. We can't process such frames then since
2968 * that might, for example, cause stations to be added or other
2969 * driver callbacks be invoked.
2971 if (unlikely(local
->quiescing
|| local
->suspended
))
2975 * The same happens when we're not even started,
2976 * but that's worth a warning.
2978 if (WARN_ON(!local
->started
))
2981 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2983 * Validate the rate, unless a PLCP error means that
2984 * we probably can't have a valid rate here anyway.
2987 if (status
->flag
& RX_FLAG_HT
) {
2989 * rate_idx is MCS index, which can be [0-76]
2992 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2994 * Anything else would be some sort of driver or
2995 * hardware error. The driver should catch hardware
2998 if (WARN((status
->rate_idx
< 0 ||
2999 status
->rate_idx
> 76),
3000 "Rate marked as an HT rate but passed "
3001 "status->rate_idx is not "
3002 "an MCS index [0-76]: %d (0x%02x)\n",
3007 if (WARN_ON(status
->rate_idx
< 0 ||
3008 status
->rate_idx
>= sband
->n_bitrates
))
3010 rate
= &sband
->bitrates
[status
->rate_idx
];
3014 status
->rx_flags
= 0;
3017 * key references and virtual interfaces are protected using RCU
3018 * and this requires that we are in a read-side RCU section during
3019 * receive processing
3024 * Frames with failed FCS/PLCP checksum are not returned,
3025 * all other frames are returned without radiotap header
3026 * if it was previously present.
3027 * Also, frames with less than 16 bytes are dropped.
3029 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3035 ieee80211_tpt_led_trig_rx(local
,
3036 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3038 __ieee80211_rx_handle_packet(hw
, skb
);
3046 EXPORT_SYMBOL(ieee80211_rx
);
3048 /* This is a version of the rx handler that can be called from hard irq
3049 * context. Post the skb on the queue and schedule the tasklet */
3050 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3052 struct ieee80211_local
*local
= hw_to_local(hw
);
3054 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3056 skb
->pkt_type
= IEEE80211_RX_MSG
;
3057 skb_queue_tail(&local
->skb_queue
, skb
);
3058 tasklet_schedule(&local
->tasklet
);
3060 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);