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 <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
43 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
44 if (likely(skb
->len
> FCS_LEN
))
45 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
57 static inline int should_drop_frame(struct sk_buff
*skb
,
60 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
61 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
63 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
65 if (unlikely(skb
->len
< 16 + present_fcs_len
))
67 if (ieee80211_is_ctl(hdr
->frame_control
) &&
68 !ieee80211_is_pspoll(hdr
->frame_control
) &&
69 !ieee80211_is_back_req(hdr
->frame_control
))
75 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
76 struct ieee80211_rx_status
*status
)
80 /* always present fields */
81 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
83 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
85 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
88 if (len
& 1) /* padding for RX_FLAGS if necessary */
91 if (status
->flag
& RX_FLAG_HT
) /* HT info */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
105 struct ieee80211_rate
*rate
,
108 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
109 struct ieee80211_radiotap_header
*rthdr
;
113 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
114 memset(rthdr
, 0, rtap_len
);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
122 rthdr
->it_len
= cpu_to_le16(rtap_len
);
124 pos
= (unsigned char *)(rthdr
+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
130 put_unaligned_le64(status
->mactime
, pos
);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
138 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
139 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
140 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
141 if (status
->flag
& RX_FLAG_SHORTPRE
)
142 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (!rate
|| status
->flag
& RX_FLAG_HT
) {
148 * Without rate information don't add it. If we have,
149 * MCS information is a separate field in radiotap,
150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
155 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
156 *pos
= rate
->bitrate
/ 5;
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status
->freq
, pos
);
163 if (status
->band
== IEEE80211_BAND_5GHZ
)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
166 else if (status
->flag
& RX_FLAG_HT
)
167 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
169 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
173 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ
, pos
);
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
&&
181 !(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
182 *pos
= status
->signal
;
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos
= status
->antenna
;
194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
198 if ((pos
- (u8
*)rthdr
) & 1)
200 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
201 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
202 put_unaligned_le16(rx_flags
, pos
);
205 if (status
->flag
& RX_FLAG_HT
) {
206 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
207 *pos
++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS
|
208 IEEE80211_RADIOTAP_MCS_HAVE_GI
|
209 IEEE80211_RADIOTAP_MCS_HAVE_BW
;
211 if (status
->flag
& RX_FLAG_SHORT_GI
)
212 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
213 if (status
->flag
& RX_FLAG_40MHZ
)
214 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
216 *pos
++ = status
->rate_idx
;
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
225 static struct sk_buff
*
226 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
227 struct ieee80211_rate
*rate
)
229 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
230 struct ieee80211_sub_if_data
*sdata
;
232 struct sk_buff
*skb
, *skb2
;
233 struct net_device
*prev_dev
= NULL
;
234 int present_fcs_len
= 0;
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
245 /* room for the radiotap header based on driver features */
246 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
248 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
249 present_fcs_len
= FCS_LEN
;
251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb
, 2)) {
253 dev_kfree_skb(origskb
);
257 if (!local
->monitors
) {
258 if (should_drop_frame(origskb
, present_fcs_len
)) {
259 dev_kfree_skb(origskb
);
263 return remove_monitor_info(local
, origskb
);
266 if (should_drop_frame(origskb
, present_fcs_len
)) {
267 /* only need to expand headroom if necessary */
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
278 if (skb_headroom(skb
) < needed_headroom
&&
279 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
288 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
290 origskb
= remove_monitor_info(local
, origskb
);
296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
299 skb_reset_mac_header(skb
);
300 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
301 skb
->pkt_type
= PACKET_OTHERHOST
;
302 skb
->protocol
= htons(ETH_P_802_2
);
304 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
305 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
308 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
311 if (!ieee80211_sdata_running(sdata
))
315 skb2
= skb_clone(skb
, GFP_ATOMIC
);
317 skb2
->dev
= prev_dev
;
318 netif_receive_skb(skb2
);
322 prev_dev
= sdata
->dev
;
323 sdata
->dev
->stats
.rx_packets
++;
324 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
329 netif_receive_skb(skb
);
337 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
339 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
340 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
341 int tid
, seqno_idx
, security_idx
;
343 /* does the frame have a qos control field? */
344 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
345 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
346 /* frame has qos control */
347 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
348 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
349 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
355 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 * Sequence numbers for management frames, QoS data
358 * frames with a broadcast/multicast address in the
359 * Address 1 field, and all non-QoS data frames sent
360 * by QoS STAs are assigned using an additional single
361 * modulo-4096 counter, [...]
363 * We also use that counter for non-QoS STAs.
365 seqno_idx
= NUM_RX_DATA_QUEUES
;
367 if (ieee80211_is_mgmt(hdr
->frame_control
))
368 security_idx
= NUM_RX_DATA_QUEUES
;
372 rx
->seqno_idx
= seqno_idx
;
373 rx
->security_idx
= security_idx
;
374 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
375 * For now, set skb->priority to 0 for other cases. */
376 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
380 * DOC: Packet alignment
382 * Drivers always need to pass packets that are aligned to two-byte boundaries
385 * Additionally, should, if possible, align the payload data in a way that
386 * guarantees that the contained IP header is aligned to a four-byte
387 * boundary. In the case of regular frames, this simply means aligning the
388 * payload to a four-byte boundary (because either the IP header is directly
389 * contained, or IV/RFC1042 headers that have a length divisible by four are
390 * in front of it). If the payload data is not properly aligned and the
391 * architecture doesn't support efficient unaligned operations, mac80211
392 * will align the data.
394 * With A-MSDU frames, however, the payload data address must yield two modulo
395 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
396 * push the IP header further back to a multiple of four again. Thankfully, the
397 * specs were sane enough this time around to require padding each A-MSDU
398 * subframe to a length that is a multiple of four.
400 * Padding like Atheros hardware adds which is between the 802.11 header and
401 * the payload is not supported, the driver is required to move the 802.11
402 * header to be directly in front of the payload in that case.
404 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
406 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
407 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
408 "unaligned packet at 0x%p\n", rx
->skb
->data
);
415 static ieee80211_rx_result debug_noinline
416 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
418 struct ieee80211_local
*local
= rx
->local
;
419 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
420 struct sk_buff
*skb
= rx
->skb
;
422 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
423 !local
->sched_scanning
))
426 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
427 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
428 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
429 local
->sched_scanning
)
430 return ieee80211_scan_rx(rx
->sdata
, skb
);
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
434 return RX_DROP_UNUSABLE
;
438 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
440 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
442 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
445 return ieee80211_is_robust_mgmt_frame(hdr
);
449 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
451 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
453 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
456 return ieee80211_is_robust_mgmt_frame(hdr
);
460 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
461 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
463 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
464 struct ieee80211_mmie
*mmie
;
466 if (skb
->len
< 24 + sizeof(*mmie
) ||
467 !is_multicast_ether_addr(hdr
->da
))
470 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
471 return -1; /* not a robust management frame */
473 mmie
= (struct ieee80211_mmie
*)
474 (skb
->data
+ skb
->len
- sizeof(*mmie
));
475 if (mmie
->element_id
!= WLAN_EID_MMIE
||
476 mmie
->length
!= sizeof(*mmie
) - 2)
479 return le16_to_cpu(mmie
->key_id
);
483 static ieee80211_rx_result
484 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
486 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
487 char *dev_addr
= rx
->sdata
->vif
.addr
;
489 if (ieee80211_is_data(hdr
->frame_control
)) {
490 if (is_multicast_ether_addr(hdr
->addr1
)) {
491 if (ieee80211_has_tods(hdr
->frame_control
) ||
492 !ieee80211_has_fromds(hdr
->frame_control
))
493 return RX_DROP_MONITOR
;
494 if (compare_ether_addr(hdr
->addr3
, dev_addr
) == 0)
495 return RX_DROP_MONITOR
;
497 if (!ieee80211_has_a4(hdr
->frame_control
))
498 return RX_DROP_MONITOR
;
499 if (compare_ether_addr(hdr
->addr4
, dev_addr
) == 0)
500 return RX_DROP_MONITOR
;
504 /* If there is not an established peer link and this is not a peer link
505 * establisment frame, beacon or probe, drop the frame.
508 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
509 struct ieee80211_mgmt
*mgmt
;
511 if (!ieee80211_is_mgmt(hdr
->frame_control
))
512 return RX_DROP_MONITOR
;
514 if (ieee80211_is_action(hdr
->frame_control
)) {
516 mgmt
= (struct ieee80211_mgmt
*)hdr
;
517 category
= mgmt
->u
.action
.category
;
518 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
519 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
520 return RX_DROP_MONITOR
;
524 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
525 ieee80211_is_probe_resp(hdr
->frame_control
) ||
526 ieee80211_is_beacon(hdr
->frame_control
) ||
527 ieee80211_is_auth(hdr
->frame_control
))
530 return RX_DROP_MONITOR
;
537 #define SEQ_MODULO 0x1000
538 #define SEQ_MASK 0xfff
540 static inline int seq_less(u16 sq1
, u16 sq2
)
542 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
545 static inline u16
seq_inc(u16 sq
)
547 return (sq
+ 1) & SEQ_MASK
;
550 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
552 return (sq1
- sq2
) & SEQ_MASK
;
556 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
557 struct tid_ampdu_rx
*tid_agg_rx
,
560 struct ieee80211_local
*local
= hw_to_local(hw
);
561 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
562 struct ieee80211_rx_status
*status
;
564 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
569 /* release the frame from the reorder ring buffer */
570 tid_agg_rx
->stored_mpdu_num
--;
571 tid_agg_rx
->reorder_buf
[index
] = NULL
;
572 status
= IEEE80211_SKB_RXCB(skb
);
573 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
574 skb_queue_tail(&local
->rx_skb_queue
, skb
);
577 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
580 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
581 struct tid_ampdu_rx
*tid_agg_rx
,
586 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
588 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
589 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
590 tid_agg_rx
->buf_size
;
591 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
596 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
597 * the skb was added to the buffer longer than this time ago, the earlier
598 * frames that have not yet been received are assumed to be lost and the skb
599 * can be released for processing. This may also release other skb's from the
600 * reorder buffer if there are no additional gaps between the frames.
602 * Callers must hold tid_agg_rx->reorder_lock.
604 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
606 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
607 struct tid_ampdu_rx
*tid_agg_rx
)
611 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
613 /* release the buffer until next missing frame */
614 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
615 tid_agg_rx
->buf_size
;
616 if (!tid_agg_rx
->reorder_buf
[index
] &&
617 tid_agg_rx
->stored_mpdu_num
) {
619 * No buffers ready to be released, but check whether any
620 * frames in the reorder buffer have timed out.
623 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
624 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
625 if (!tid_agg_rx
->reorder_buf
[j
]) {
630 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
631 HT_RX_REORDER_BUF_TIMEOUT
))
632 goto set_release_timer
;
634 #ifdef CONFIG_MAC80211_HT_DEBUG
636 wiphy_debug(hw
->wiphy
,
637 "release an RX reorder frame due to timeout on earlier frames\n");
639 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
642 * Increment the head seq# also for the skipped slots.
644 tid_agg_rx
->head_seq_num
=
645 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
648 } else while (tid_agg_rx
->reorder_buf
[index
]) {
649 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
650 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
651 tid_agg_rx
->buf_size
;
654 if (tid_agg_rx
->stored_mpdu_num
) {
655 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
656 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
658 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
659 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
660 if (tid_agg_rx
->reorder_buf
[j
])
666 mod_timer(&tid_agg_rx
->reorder_timer
,
667 tid_agg_rx
->reorder_time
[j
] + 1 +
668 HT_RX_REORDER_BUF_TIMEOUT
);
670 del_timer(&tid_agg_rx
->reorder_timer
);
675 * As this function belongs to the RX path it must be under
676 * rcu_read_lock protection. It returns false if the frame
677 * can be processed immediately, true if it was consumed.
679 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
680 struct tid_ampdu_rx
*tid_agg_rx
,
683 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
684 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
685 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
686 u16 head_seq_num
, buf_size
;
690 spin_lock(&tid_agg_rx
->reorder_lock
);
692 buf_size
= tid_agg_rx
->buf_size
;
693 head_seq_num
= tid_agg_rx
->head_seq_num
;
695 /* frame with out of date sequence number */
696 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
702 * If frame the sequence number exceeds our buffering window
703 * size release some previous frames to make room for this one.
705 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
706 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
707 /* release stored frames up to new head to stack */
708 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
711 /* Now the new frame is always in the range of the reordering buffer */
713 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
715 /* check if we already stored this frame */
716 if (tid_agg_rx
->reorder_buf
[index
]) {
722 * If the current MPDU is in the right order and nothing else
723 * is stored we can process it directly, no need to buffer it.
724 * If it is first but there's something stored, we may be able
725 * to release frames after this one.
727 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
728 tid_agg_rx
->stored_mpdu_num
== 0) {
729 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
734 /* put the frame in the reordering buffer */
735 tid_agg_rx
->reorder_buf
[index
] = skb
;
736 tid_agg_rx
->reorder_time
[index
] = jiffies
;
737 tid_agg_rx
->stored_mpdu_num
++;
738 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
741 spin_unlock(&tid_agg_rx
->reorder_lock
);
746 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
747 * true if the MPDU was buffered, false if it should be processed.
749 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
751 struct sk_buff
*skb
= rx
->skb
;
752 struct ieee80211_local
*local
= rx
->local
;
753 struct ieee80211_hw
*hw
= &local
->hw
;
754 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
755 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
756 struct sta_info
*sta
= rx
->sta
;
757 struct tid_ampdu_rx
*tid_agg_rx
;
761 if (!ieee80211_is_data_qos(hdr
->frame_control
))
765 * filter the QoS data rx stream according to
766 * STA/TID and check if this STA/TID is on aggregation
772 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
773 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
774 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
776 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
780 /* qos null data frames are excluded */
781 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
784 /* not part of a BA session */
785 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
786 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
789 /* not actually part of this BA session */
790 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
793 /* new, potentially un-ordered, ampdu frame - process it */
795 /* reset session timer */
796 if (tid_agg_rx
->timeout
)
797 tid_agg_rx
->last_rx
= jiffies
;
799 /* if this mpdu is fragmented - terminate rx aggregation session */
800 sc
= le16_to_cpu(hdr
->seq_ctrl
);
801 if (sc
& IEEE80211_SCTL_FRAG
) {
802 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
803 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
804 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
809 * No locking needed -- we will only ever process one
810 * RX packet at a time, and thus own tid_agg_rx. All
811 * other code manipulating it needs to (and does) make
812 * sure that we cannot get to it any more before doing
815 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
819 skb_queue_tail(&local
->rx_skb_queue
, skb
);
822 static ieee80211_rx_result debug_noinline
823 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
825 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
826 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
828 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
829 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
830 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
831 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
833 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
834 rx
->local
->dot11FrameDuplicateCount
++;
835 rx
->sta
->num_duplicates
++;
837 return RX_DROP_UNUSABLE
;
839 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
842 if (unlikely(rx
->skb
->len
< 16)) {
843 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
844 return RX_DROP_MONITOR
;
847 /* Drop disallowed frame classes based on STA auth/assoc state;
848 * IEEE 802.11, Chap 5.5.
850 * mac80211 filters only based on association state, i.e. it drops
851 * Class 3 frames from not associated stations. hostapd sends
852 * deauth/disassoc frames when needed. In addition, hostapd is
853 * responsible for filtering on both auth and assoc states.
856 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
857 return ieee80211_rx_mesh_check(rx
);
859 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
860 ieee80211_is_pspoll(hdr
->frame_control
)) &&
861 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
862 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
863 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
865 * accept port control frames from the AP even when it's not
866 * yet marked ASSOC to prevent a race where we don't set the
867 * assoc bit quickly enough before it sends the first frame
869 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
870 ieee80211_is_data_present(hdr
->frame_control
)) {
874 payload
= rx
->skb
->data
+
875 ieee80211_hdrlen(hdr
->frame_control
);
876 ethertype
= (payload
[6] << 8) | payload
[7];
877 if (cpu_to_be16(ethertype
) ==
878 rx
->sdata
->control_port_protocol
)
882 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
883 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
886 return RX_DROP_UNUSABLE
;
888 return RX_DROP_MONITOR
;
895 static ieee80211_rx_result debug_noinline
896 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
898 struct sk_buff
*skb
= rx
->skb
;
899 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
900 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
903 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
904 struct ieee80211_key
*sta_ptk
= NULL
;
905 int mmie_keyidx
= -1;
911 * There are four types of keys:
913 * - IGTK (group keys for management frames)
914 * - PTK (pairwise keys)
915 * - STK (station-to-station pairwise keys)
917 * When selecting a key, we have to distinguish between multicast
918 * (including broadcast) and unicast frames, the latter can only
919 * use PTKs and STKs while the former always use GTKs and IGTKs.
920 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
921 * unicast frames can also use key indices like GTKs. Hence, if we
922 * don't have a PTK/STK we check the key index for a WEP key.
924 * Note that in a regular BSS, multicast frames are sent by the
925 * AP only, associated stations unicast the frame to the AP first
926 * which then multicasts it on their behalf.
928 * There is also a slight problem in IBSS mode: GTKs are negotiated
929 * with each station, that is something we don't currently handle.
930 * The spec seems to expect that one negotiates the same key with
931 * every station but there's no such requirement; VLANs could be
936 * No point in finding a key and decrypting if the frame is neither
937 * addressed to us nor a multicast frame.
939 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
942 /* start without a key */
946 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
948 fc
= hdr
->frame_control
;
950 if (!ieee80211_has_protected(fc
))
951 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
953 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
955 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
956 (status
->flag
& RX_FLAG_IV_STRIPPED
))
958 /* Skip decryption if the frame is not protected. */
959 if (!ieee80211_has_protected(fc
))
961 } else if (mmie_keyidx
>= 0) {
962 /* Broadcast/multicast robust management frame / BIP */
963 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
964 (status
->flag
& RX_FLAG_IV_STRIPPED
))
967 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
968 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
969 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
971 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
973 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
974 } else if (!ieee80211_has_protected(fc
)) {
976 * The frame was not protected, so skip decryption. However, we
977 * need to set rx->key if there is a key that could have been
978 * used so that the frame may be dropped if encryption would
979 * have been expected.
981 struct ieee80211_key
*key
= NULL
;
982 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
985 if (ieee80211_is_mgmt(fc
) &&
986 is_multicast_ether_addr(hdr
->addr1
) &&
987 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
991 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
992 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
998 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
999 key
= rcu_dereference(sdata
->keys
[i
]);
1011 * The device doesn't give us the IV so we won't be
1012 * able to look up the key. That's ok though, we
1013 * don't need to decrypt the frame, we just won't
1014 * be able to keep statistics accurate.
1015 * Except for key threshold notifications, should
1016 * we somehow allow the driver to tell us which key
1017 * the hardware used if this flag is set?
1019 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1020 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1023 hdrlen
= ieee80211_hdrlen(fc
);
1025 if (rx
->skb
->len
< 8 + hdrlen
)
1026 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1029 * no need to call ieee80211_wep_get_keyidx,
1030 * it verifies a bunch of things we've done already
1032 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1033 keyidx
= keyid
>> 6;
1035 /* check per-station GTK first, if multicast packet */
1036 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1037 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1039 /* if not found, try default key */
1041 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1044 * RSNA-protected unicast frames should always be
1045 * sent with pairwise or station-to-station keys,
1046 * but for WEP we allow using a key index as well.
1049 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1050 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1051 !is_multicast_ether_addr(hdr
->addr1
))
1057 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1058 return RX_DROP_MONITOR
;
1060 rx
->key
->tx_rx_count
++;
1061 /* TODO: add threshold stuff again */
1063 return RX_DROP_MONITOR
;
1066 switch (rx
->key
->conf
.cipher
) {
1067 case WLAN_CIPHER_SUITE_WEP40
:
1068 case WLAN_CIPHER_SUITE_WEP104
:
1069 result
= ieee80211_crypto_wep_decrypt(rx
);
1071 case WLAN_CIPHER_SUITE_TKIP
:
1072 result
= ieee80211_crypto_tkip_decrypt(rx
);
1074 case WLAN_CIPHER_SUITE_CCMP
:
1075 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1077 case WLAN_CIPHER_SUITE_AES_CMAC
:
1078 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1082 * We can reach here only with HW-only algorithms
1083 * but why didn't it decrypt the frame?!
1085 return RX_DROP_UNUSABLE
;
1088 /* the hdr variable is invalid after the decrypt handlers */
1090 /* either the frame has been decrypted or will be dropped */
1091 status
->flag
|= RX_FLAG_DECRYPTED
;
1096 static ieee80211_rx_result debug_noinline
1097 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1099 struct ieee80211_local
*local
;
1100 struct ieee80211_hdr
*hdr
;
1101 struct sk_buff
*skb
;
1105 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1107 if (!local
->pspolling
)
1110 if (!ieee80211_has_fromds(hdr
->frame_control
))
1111 /* this is not from AP */
1114 if (!ieee80211_is_data(hdr
->frame_control
))
1117 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1118 /* AP has no more frames buffered for us */
1119 local
->pspolling
= false;
1123 /* more data bit is set, let's request a new frame from the AP */
1124 ieee80211_send_pspoll(local
, rx
->sdata
);
1129 static void ap_sta_ps_start(struct sta_info
*sta
)
1131 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1132 struct ieee80211_local
*local
= sdata
->local
;
1134 atomic_inc(&sdata
->bss
->num_sta_ps
);
1135 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1136 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1137 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1138 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1139 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1140 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1141 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144 static void ap_sta_ps_end(struct sta_info
*sta
)
1146 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1147 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1148 sta
->sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1149 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1151 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1152 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1153 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1154 sta
->sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1155 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1159 ieee80211_sta_ps_deliver_wakeup(sta
);
1162 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1164 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1167 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1169 /* Don't let the same PS state be set twice */
1170 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1171 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1175 ap_sta_ps_start(sta_inf
);
1177 ap_sta_ps_end(sta_inf
);
1181 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1183 static ieee80211_rx_result debug_noinline
1184 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1186 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1187 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1188 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1191 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1194 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1195 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1199 * The device handles station powersave, so don't do anything about
1200 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1201 * it to mac80211 since they're handled.)
1203 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1207 * Don't do anything if the station isn't already asleep. In
1208 * the uAPSD case, the station will probably be marked asleep,
1209 * in the PS-Poll case the station must be confused ...
1211 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1214 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1215 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1216 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1217 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1219 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1222 /* Free PS Poll skb here instead of returning RX_DROP that would
1223 * count as an dropped frame. */
1224 dev_kfree_skb(rx
->skb
);
1227 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1228 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1229 ieee80211_has_pm(hdr
->frame_control
) &&
1230 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1231 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1232 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1233 ac
= ieee802_1d_to_ac
[tid
& 7];
1236 * If this AC is not trigger-enabled do nothing.
1238 * NB: This could/should check a separate bitmap of trigger-
1239 * enabled queues, but for now we only implement uAPSD w/o
1240 * TSPEC changes to the ACs, so they're always the same.
1242 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1245 /* if we are in a service period, do nothing */
1246 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1249 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1250 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1252 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1258 static ieee80211_rx_result debug_noinline
1259 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1261 struct sta_info
*sta
= rx
->sta
;
1262 struct sk_buff
*skb
= rx
->skb
;
1263 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1264 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1270 * Update last_rx only for IBSS packets which are for the current
1271 * BSSID to avoid keeping the current IBSS network alive in cases
1272 * where other STAs start using different BSSID.
1274 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1275 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1276 NL80211_IFTYPE_ADHOC
);
1277 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1278 sta
->last_rx
= jiffies
;
1279 if (ieee80211_is_data(hdr
->frame_control
)) {
1280 sta
->last_rx_rate_idx
= status
->rate_idx
;
1281 sta
->last_rx_rate_flag
= status
->flag
;
1284 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1286 * Mesh beacons will update last_rx when if they are found to
1287 * match the current local configuration when processed.
1289 sta
->last_rx
= jiffies
;
1290 if (ieee80211_is_data(hdr
->frame_control
)) {
1291 sta
->last_rx_rate_idx
= status
->rate_idx
;
1292 sta
->last_rx_rate_flag
= status
->flag
;
1296 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1299 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1300 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1302 sta
->rx_fragments
++;
1303 sta
->rx_bytes
+= rx
->skb
->len
;
1304 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1305 sta
->last_signal
= status
->signal
;
1306 ewma_add(&sta
->avg_signal
, -status
->signal
);
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1313 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1314 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1315 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1316 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1317 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1318 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1327 if (ieee80211_is_data(hdr
->frame_control
) &&
1328 !ieee80211_has_pm(hdr
->frame_control
))
1331 if (ieee80211_has_pm(hdr
->frame_control
))
1332 ap_sta_ps_start(sta
);
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1340 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1341 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1342 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1345 * If we receive a 4-addr nullfunc frame from a STA
1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
1350 if (ieee80211_has_a4(hdr
->frame_control
) &&
1351 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1352 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1353 !rx
->sdata
->u
.vlan
.sta
))) {
1354 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx
->sdata
->dev
, sta
->sta
.addr
,
1358 return RX_DROP_MONITOR
;
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1365 dev_kfree_skb(rx
->skb
);
1370 } /* ieee80211_rx_h_sta_process */
1372 static inline struct ieee80211_fragment_entry
*
1373 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1374 unsigned int frag
, unsigned int seq
, int rx_queue
,
1375 struct sk_buff
**skb
)
1377 struct ieee80211_fragment_entry
*entry
;
1380 idx
= sdata
->fragment_next
;
1381 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1382 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1383 sdata
->fragment_next
= 0;
1385 if (!skb_queue_empty(&entry
->skb_list
)) {
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387 struct ieee80211_hdr
*hdr
=
1388 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1389 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1391 "addr1=%pM addr2=%pM\n",
1393 jiffies
- entry
->first_frag_time
, entry
->seq
,
1394 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1396 __skb_queue_purge(&entry
->skb_list
);
1399 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1401 entry
->first_frag_time
= jiffies
;
1403 entry
->rx_queue
= rx_queue
;
1404 entry
->last_frag
= frag
;
1406 entry
->extra_len
= 0;
1411 static inline struct ieee80211_fragment_entry
*
1412 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1413 unsigned int frag
, unsigned int seq
,
1414 int rx_queue
, struct ieee80211_hdr
*hdr
)
1416 struct ieee80211_fragment_entry
*entry
;
1419 idx
= sdata
->fragment_next
;
1420 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1421 struct ieee80211_hdr
*f_hdr
;
1425 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1427 entry
= &sdata
->fragments
[idx
];
1428 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1429 entry
->rx_queue
!= rx_queue
||
1430 entry
->last_frag
+ 1 != frag
)
1433 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1436 * Check ftype and addresses are equal, else check next fragment
1438 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1440 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1441 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1444 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1445 __skb_queue_purge(&entry
->skb_list
);
1454 static ieee80211_rx_result debug_noinline
1455 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1457 struct ieee80211_hdr
*hdr
;
1460 unsigned int frag
, seq
;
1461 struct ieee80211_fragment_entry
*entry
;
1462 struct sk_buff
*skb
;
1463 struct ieee80211_rx_status
*status
;
1465 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1466 fc
= hdr
->frame_control
;
1467 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1468 frag
= sc
& IEEE80211_SCTL_FRAG
;
1470 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1471 (rx
->skb
)->len
< 24 ||
1472 is_multicast_ether_addr(hdr
->addr1
))) {
1473 /* not fragmented */
1476 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1478 if (skb_linearize(rx
->skb
))
1479 return RX_DROP_UNUSABLE
;
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1486 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1487 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1490 /* This is the first fragment of a new frame. */
1491 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1492 rx
->seqno_idx
, &(rx
->skb
));
1493 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1494 ieee80211_has_protected(fc
)) {
1495 int queue
= rx
->security_idx
;
1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1499 memcpy(entry
->last_pn
,
1500 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1509 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1510 rx
->seqno_idx
, hdr
);
1512 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1513 return RX_DROP_MONITOR
;
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1520 u8 pn
[CCMP_PN_LEN
], *rpn
;
1522 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1523 return RX_DROP_UNUSABLE
;
1524 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1525 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1530 queue
= rx
->security_idx
;
1531 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1532 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1533 return RX_DROP_UNUSABLE
;
1534 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1537 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1538 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1539 entry
->last_frag
= frag
;
1540 entry
->extra_len
+= rx
->skb
->len
;
1541 if (ieee80211_has_morefrags(fc
)) {
1546 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1547 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1548 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1549 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1551 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1552 __skb_queue_purge(&entry
->skb_list
);
1553 return RX_DROP_UNUSABLE
;
1556 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1557 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1561 /* Complete frame has been reassembled - process it now */
1562 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1563 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1567 rx
->sta
->rx_packets
++;
1568 if (is_multicast_ether_addr(hdr
->addr1
))
1569 rx
->local
->dot11MulticastReceivedFrameCount
++;
1571 ieee80211_led_rx(rx
->local
);
1576 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1578 if (unlikely(!rx
->sta
||
1579 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1586 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1588 struct sk_buff
*skb
= rx
->skb
;
1589 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1592 * Pass through unencrypted frames if the hardware has
1593 * decrypted them already.
1595 if (status
->flag
& RX_FLAG_DECRYPTED
)
1598 /* Drop unencrypted frames if key is set. */
1599 if (unlikely(!ieee80211_has_protected(fc
) &&
1600 !ieee80211_is_nullfunc(fc
) &&
1601 ieee80211_is_data(fc
) &&
1602 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1609 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1611 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1612 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1613 __le16 fc
= hdr
->frame_control
;
1616 * Pass through unencrypted frames if the hardware has
1617 * decrypted them already.
1619 if (status
->flag
& RX_FLAG_DECRYPTED
)
1622 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1623 if (unlikely(!ieee80211_has_protected(fc
) &&
1624 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1626 if (ieee80211_is_deauth(fc
))
1627 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1630 else if (ieee80211_is_disassoc(fc
))
1631 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1636 /* BIP does not use Protected field, so need to check MMIE */
1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1638 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1639 if (ieee80211_is_deauth(fc
))
1640 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1643 else if (ieee80211_is_disassoc(fc
))
1644 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1650 * When using MFP, Action frames are not allowed prior to
1651 * having configured keys.
1653 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1654 ieee80211_is_robust_mgmt_frame(
1655 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1663 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1665 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1666 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1667 bool check_port_control
= false;
1668 struct ethhdr
*ehdr
;
1671 *port_control
= false;
1672 if (ieee80211_has_a4(hdr
->frame_control
) &&
1673 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1676 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1677 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1679 if (!sdata
->u
.mgd
.use_4addr
)
1682 check_port_control
= true;
1685 if (is_multicast_ether_addr(hdr
->addr1
) &&
1686 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1689 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1693 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1694 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1695 *port_control
= true;
1696 else if (check_port_control
)
1703 * requires that rx->skb is a frame with ethernet header
1705 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1707 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1712 * Allow EAPOL frames to us/the PAE group address regardless
1713 * of whether the frame was encrypted or not.
1715 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1716 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1717 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1720 if (ieee80211_802_1x_port_control(rx
) ||
1721 ieee80211_drop_unencrypted(rx
, fc
))
1728 * requires that rx->skb is a frame with ethernet header
1731 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1733 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1734 struct net_device
*dev
= sdata
->dev
;
1735 struct sk_buff
*skb
, *xmit_skb
;
1736 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1737 struct sta_info
*dsta
;
1738 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1743 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1744 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1745 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1746 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1747 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1748 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1750 * send multicast frames both to higher layers in
1751 * local net stack and back to the wireless medium
1753 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1754 if (!xmit_skb
&& net_ratelimit())
1755 printk(KERN_DEBUG
"%s: failed to clone "
1756 "multicast frame\n", dev
->name
);
1758 dsta
= sta_info_get(sdata
, skb
->data
);
1761 * The destination station is associated to
1762 * this AP (in this VLAN), so send the frame
1763 * directly to it and do not pass it to local
1773 int align __maybe_unused
;
1775 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1777 * 'align' will only take the values 0 or 2 here
1778 * since all frames are required to be aligned
1779 * to 2-byte boundaries when being passed to
1780 * mac80211. That also explains the __skb_push()
1783 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1785 if (WARN_ON(skb_headroom(skb
) < 3)) {
1789 u8
*data
= skb
->data
;
1790 size_t len
= skb_headlen(skb
);
1792 memmove(skb
->data
, data
, len
);
1793 skb_set_tail_pointer(skb
, len
);
1799 /* deliver to local stack */
1800 skb
->protocol
= eth_type_trans(skb
, dev
);
1801 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1802 netif_receive_skb(skb
);
1808 * Send to wireless media and increase priority by 256 to
1809 * keep the received priority instead of reclassifying
1810 * the frame (see cfg80211_classify8021d).
1812 xmit_skb
->priority
+= 256;
1813 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1814 skb_reset_network_header(xmit_skb
);
1815 skb_reset_mac_header(xmit_skb
);
1816 dev_queue_xmit(xmit_skb
);
1820 static ieee80211_rx_result debug_noinline
1821 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1823 struct net_device
*dev
= rx
->sdata
->dev
;
1824 struct sk_buff
*skb
= rx
->skb
;
1825 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1826 __le16 fc
= hdr
->frame_control
;
1827 struct sk_buff_head frame_list
;
1828 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1830 if (unlikely(!ieee80211_is_data(fc
)))
1833 if (unlikely(!ieee80211_is_data_present(fc
)))
1834 return RX_DROP_MONITOR
;
1836 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1839 if (ieee80211_has_a4(hdr
->frame_control
) &&
1840 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1841 !rx
->sdata
->u
.vlan
.sta
)
1842 return RX_DROP_UNUSABLE
;
1844 if (is_multicast_ether_addr(hdr
->addr1
) &&
1845 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1846 rx
->sdata
->u
.vlan
.sta
) ||
1847 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1848 rx
->sdata
->u
.mgd
.use_4addr
)))
1849 return RX_DROP_UNUSABLE
;
1852 __skb_queue_head_init(&frame_list
);
1854 if (skb_linearize(skb
))
1855 return RX_DROP_UNUSABLE
;
1857 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1858 rx
->sdata
->vif
.type
,
1859 rx
->local
->hw
.extra_tx_headroom
, true);
1861 while (!skb_queue_empty(&frame_list
)) {
1862 rx
->skb
= __skb_dequeue(&frame_list
);
1864 if (!ieee80211_frame_allowed(rx
, fc
)) {
1865 dev_kfree_skb(rx
->skb
);
1868 dev
->stats
.rx_packets
++;
1869 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1871 ieee80211_deliver_skb(rx
);
1877 #ifdef CONFIG_MAC80211_MESH
1878 static ieee80211_rx_result
1879 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1881 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
1882 struct ieee80211_tx_info
*info
;
1883 struct ieee80211s_hdr
*mesh_hdr
;
1884 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1885 struct ieee80211_local
*local
= rx
->local
;
1886 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1887 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1888 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1889 __le16 reason
= cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD
);
1892 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1893 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1894 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1896 /* frame is in RMC, don't forward */
1897 if (ieee80211_is_data(hdr
->frame_control
) &&
1898 is_multicast_ether_addr(hdr
->addr1
) &&
1899 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1900 return RX_DROP_MONITOR
;
1902 if (!ieee80211_is_data(hdr
->frame_control
))
1906 return RX_DROP_MONITOR
;
1908 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1909 struct mesh_path
*mppath
;
1913 if (is_multicast_ether_addr(hdr
->addr1
)) {
1914 mpp_addr
= hdr
->addr3
;
1915 proxied_addr
= mesh_hdr
->eaddr1
;
1917 mpp_addr
= hdr
->addr4
;
1918 proxied_addr
= mesh_hdr
->eaddr2
;
1922 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1924 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1926 spin_lock_bh(&mppath
->state_lock
);
1927 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1928 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1929 spin_unlock_bh(&mppath
->state_lock
);
1934 /* Frame has reached destination. Don't forward */
1935 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1936 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1939 q
= ieee80211_select_queue_80211(local
, skb
, hdr
);
1940 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
1942 return RX_DROP_MONITOR
;
1944 skb_set_queue_mapping(skb
, q
);
1946 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1949 if (!--mesh_hdr
->ttl
) {
1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
1951 return RX_DROP_MONITOR
;
1954 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
1957 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1959 if (net_ratelimit())
1960 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1965 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1966 info
= IEEE80211_SKB_CB(fwd_skb
);
1967 memset(info
, 0, sizeof(*info
));
1968 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1969 info
->control
.vif
= &rx
->sdata
->vif
;
1970 info
->control
.jiffies
= jiffies
;
1971 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_mcast
);
1973 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1974 } else if (!mesh_nexthop_lookup(fwd_skb
, sdata
)) {
1975 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_unicast
);
1977 /* unable to resolve next hop */
1978 mesh_path_error_tx(ifmsh
->mshcfg
.element_ttl
, fwd_hdr
->addr3
,
1979 0, reason
, fwd_hdr
->addr2
, sdata
);
1980 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_no_route
);
1982 return RX_DROP_MONITOR
;
1985 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, fwded_frames
);
1986 ieee80211_add_pending_skb(local
, fwd_skb
);
1988 if (is_multicast_ether_addr(hdr
->addr1
) ||
1989 sdata
->dev
->flags
& IFF_PROMISC
)
1992 return RX_DROP_MONITOR
;
1996 static ieee80211_rx_result debug_noinline
1997 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1999 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2000 struct ieee80211_local
*local
= rx
->local
;
2001 struct net_device
*dev
= sdata
->dev
;
2002 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2003 __le16 fc
= hdr
->frame_control
;
2007 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2010 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2011 return RX_DROP_MONITOR
;
2014 * Send unexpected-4addr-frame event to hostapd. For older versions,
2015 * also drop the frame to cooked monitor interfaces.
2017 if (ieee80211_has_a4(hdr
->frame_control
) &&
2018 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2020 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2021 cfg80211_rx_unexpected_4addr_frame(
2022 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2023 return RX_DROP_MONITOR
;
2026 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2028 return RX_DROP_UNUSABLE
;
2030 if (!ieee80211_frame_allowed(rx
, fc
))
2031 return RX_DROP_MONITOR
;
2033 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2034 unlikely(port_control
) && sdata
->bss
) {
2035 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2043 dev
->stats
.rx_packets
++;
2044 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2046 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2047 !is_multicast_ether_addr(
2048 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2049 (!local
->scanning
&&
2050 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2051 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2052 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2055 ieee80211_deliver_skb(rx
);
2060 static ieee80211_rx_result debug_noinline
2061 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2063 struct ieee80211_local
*local
= rx
->local
;
2064 struct ieee80211_hw
*hw
= &local
->hw
;
2065 struct sk_buff
*skb
= rx
->skb
;
2066 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2067 struct tid_ampdu_rx
*tid_agg_rx
;
2071 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2074 if (ieee80211_is_back_req(bar
->frame_control
)) {
2076 __le16 control
, start_seq_num
;
2077 } __packed bar_data
;
2080 return RX_DROP_MONITOR
;
2082 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2083 &bar_data
, sizeof(bar_data
)))
2084 return RX_DROP_MONITOR
;
2086 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2088 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2090 return RX_DROP_MONITOR
;
2092 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2094 /* reset session timer */
2095 if (tid_agg_rx
->timeout
)
2096 mod_timer(&tid_agg_rx
->session_timer
,
2097 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2099 spin_lock(&tid_agg_rx
->reorder_lock
);
2100 /* release stored frames up to start of BAR */
2101 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2102 spin_unlock(&tid_agg_rx
->reorder_lock
);
2109 * After this point, we only want management frames,
2110 * so we can drop all remaining control frames to
2111 * cooked monitor interfaces.
2113 return RX_DROP_MONITOR
;
2116 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2117 struct ieee80211_mgmt
*mgmt
,
2120 struct ieee80211_local
*local
= sdata
->local
;
2121 struct sk_buff
*skb
;
2122 struct ieee80211_mgmt
*resp
;
2124 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2125 /* Not to own unicast address */
2129 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2130 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2131 /* Not from the current AP or not associated yet. */
2135 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2136 /* Too short SA Query request frame */
2140 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2144 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2145 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2146 memset(resp
, 0, 24);
2147 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2148 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2149 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2150 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2151 IEEE80211_STYPE_ACTION
);
2152 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2153 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2154 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2155 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2156 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2157 WLAN_SA_QUERY_TR_ID_LEN
);
2159 ieee80211_tx_skb(sdata
, skb
);
2162 static ieee80211_rx_result debug_noinline
2163 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2165 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2166 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2169 * From here on, look only at management frames.
2170 * Data and control frames are already handled,
2171 * and unknown (reserved) frames are useless.
2173 if (rx
->skb
->len
< 24)
2174 return RX_DROP_MONITOR
;
2176 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2177 return RX_DROP_MONITOR
;
2179 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2180 ieee80211_is_beacon(mgmt
->frame_control
) &&
2181 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2184 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2185 sig
= status
->signal
;
2187 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2188 rx
->skb
->data
, rx
->skb
->len
,
2189 status
->freq
, sig
, GFP_ATOMIC
);
2190 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2193 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2194 return RX_DROP_MONITOR
;
2196 if (ieee80211_drop_unencrypted_mgmt(rx
))
2197 return RX_DROP_UNUSABLE
;
2202 static ieee80211_rx_result debug_noinline
2203 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2205 struct ieee80211_local
*local
= rx
->local
;
2206 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2207 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2208 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2209 int len
= rx
->skb
->len
;
2211 if (!ieee80211_is_action(mgmt
->frame_control
))
2214 /* drop too small frames */
2215 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2216 return RX_DROP_UNUSABLE
;
2218 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2219 return RX_DROP_UNUSABLE
;
2221 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2222 return RX_DROP_UNUSABLE
;
2224 switch (mgmt
->u
.action
.category
) {
2225 case WLAN_CATEGORY_HT
:
2226 /* reject HT action frames from stations not supporting HT */
2227 if (!rx
->sta
->sta
.ht_cap
.ht_supported
)
2230 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2231 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2232 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2233 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2234 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2237 /* verify action & smps_control are present */
2238 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 2)
2241 switch (mgmt
->u
.action
.u
.ht_smps
.action
) {
2242 case WLAN_HT_ACTION_SMPS
: {
2243 struct ieee80211_supported_band
*sband
;
2246 /* convert to HT capability */
2247 switch (mgmt
->u
.action
.u
.ht_smps
.smps_control
) {
2248 case WLAN_HT_SMPS_CONTROL_DISABLED
:
2249 smps
= WLAN_HT_CAP_SM_PS_DISABLED
;
2251 case WLAN_HT_SMPS_CONTROL_STATIC
:
2252 smps
= WLAN_HT_CAP_SM_PS_STATIC
;
2254 case WLAN_HT_SMPS_CONTROL_DYNAMIC
:
2255 smps
= WLAN_HT_CAP_SM_PS_DYNAMIC
;
2260 smps
<<= IEEE80211_HT_CAP_SM_PS_SHIFT
;
2262 /* if no change do nothing */
2263 if ((rx
->sta
->sta
.ht_cap
.cap
&
2264 IEEE80211_HT_CAP_SM_PS
) == smps
)
2267 rx
->sta
->sta
.ht_cap
.cap
&= ~IEEE80211_HT_CAP_SM_PS
;
2268 rx
->sta
->sta
.ht_cap
.cap
|= smps
;
2270 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2272 rate_control_rate_update(local
, sband
, rx
->sta
,
2273 IEEE80211_RC_SMPS_CHANGED
);
2281 case WLAN_CATEGORY_BACK
:
2282 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2283 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2284 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2285 sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
2286 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2289 /* verify action_code is present */
2290 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2293 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2294 case WLAN_ACTION_ADDBA_REQ
:
2295 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2296 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2299 case WLAN_ACTION_ADDBA_RESP
:
2300 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2301 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2304 case WLAN_ACTION_DELBA
:
2305 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2306 sizeof(mgmt
->u
.action
.u
.delba
)))
2314 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2315 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2318 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2321 /* verify action_code is present */
2322 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2325 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2326 case WLAN_ACTION_SPCT_MSR_REQ
:
2327 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2328 sizeof(mgmt
->u
.action
.u
.measurement
)))
2330 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2332 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2333 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2334 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2337 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2340 if (compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
))
2346 case WLAN_CATEGORY_SA_QUERY
:
2347 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2348 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2351 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2352 case WLAN_ACTION_SA_QUERY_REQUEST
:
2353 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2355 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2359 case WLAN_CATEGORY_SELF_PROTECTED
:
2360 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2361 case WLAN_SP_MESH_PEERING_OPEN
:
2362 case WLAN_SP_MESH_PEERING_CLOSE
:
2363 case WLAN_SP_MESH_PEERING_CONFIRM
:
2364 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2366 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2367 /* userspace handles this frame */
2370 case WLAN_SP_MGK_INFORM
:
2371 case WLAN_SP_MGK_ACK
:
2372 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2377 case WLAN_CATEGORY_MESH_ACTION
:
2378 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2380 if (mesh_action_is_path_sel(mgmt
) &&
2381 (!mesh_path_sel_is_hwmp(sdata
)))
2389 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2390 /* will return in the next handlers */
2395 rx
->sta
->rx_packets
++;
2396 dev_kfree_skb(rx
->skb
);
2400 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2401 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2402 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2404 rx
->sta
->rx_packets
++;
2408 static ieee80211_rx_result debug_noinline
2409 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2411 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2414 /* skip known-bad action frames and return them in the next handler */
2415 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2419 * Getting here means the kernel doesn't know how to handle
2420 * it, but maybe userspace does ... include returned frames
2421 * so userspace can register for those to know whether ones
2422 * it transmitted were processed or returned.
2425 if (rx
->local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
2426 sig
= status
->signal
;
2428 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
, sig
,
2429 rx
->skb
->data
, rx
->skb
->len
,
2432 rx
->sta
->rx_packets
++;
2433 dev_kfree_skb(rx
->skb
);
2441 static ieee80211_rx_result debug_noinline
2442 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2444 struct ieee80211_local
*local
= rx
->local
;
2445 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2446 struct sk_buff
*nskb
;
2447 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2448 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2450 if (!ieee80211_is_action(mgmt
->frame_control
))
2454 * For AP mode, hostapd is responsible for handling any action
2455 * frames that we didn't handle, including returning unknown
2456 * ones. For all other modes we will return them to the sender,
2457 * setting the 0x80 bit in the action category, as required by
2458 * 802.11-2007 7.3.1.11.
2459 * Newer versions of hostapd shall also use the management frame
2460 * registration mechanisms, but older ones still use cooked
2461 * monitor interfaces so push all frames there.
2463 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2464 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2465 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2466 return RX_DROP_MONITOR
;
2468 /* do not return rejected action frames */
2469 if (mgmt
->u
.action
.category
& 0x80)
2470 return RX_DROP_UNUSABLE
;
2472 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2475 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2477 nmgmt
->u
.action
.category
|= 0x80;
2478 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2479 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2481 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2483 ieee80211_tx_skb(rx
->sdata
, nskb
);
2485 dev_kfree_skb(rx
->skb
);
2489 static ieee80211_rx_result debug_noinline
2490 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2492 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2493 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2496 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2498 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2499 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2500 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2501 return RX_DROP_MONITOR
;
2504 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2505 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2506 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2507 /* process for all: mesh, mlme, ibss */
2509 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2510 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2511 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2512 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2513 if (is_multicast_ether_addr(mgmt
->da
) &&
2514 !is_broadcast_ether_addr(mgmt
->da
))
2515 return RX_DROP_MONITOR
;
2517 /* process only for station */
2518 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2519 return RX_DROP_MONITOR
;
2521 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2522 /* process only for ibss */
2523 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2524 return RX_DROP_MONITOR
;
2527 return RX_DROP_MONITOR
;
2530 /* queue up frame and kick off work to process it */
2531 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2532 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2533 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2535 rx
->sta
->rx_packets
++;
2540 /* TODO: use IEEE80211_RX_FRAGMENTED */
2541 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2542 struct ieee80211_rate
*rate
)
2544 struct ieee80211_sub_if_data
*sdata
;
2545 struct ieee80211_local
*local
= rx
->local
;
2546 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2547 struct net_device
*prev_dev
= NULL
;
2548 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2549 int needed_headroom
;
2552 * If cooked monitor has been processed already, then
2553 * don't do it again. If not, set the flag.
2555 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2557 rx
->flags
|= IEEE80211_RX_CMNTR
;
2559 /* If there are no cooked monitor interfaces, just free the SKB */
2560 if (!local
->cooked_mntrs
)
2563 /* room for the radiotap header based on driver features */
2564 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
2566 if (skb_headroom(skb
) < needed_headroom
&&
2567 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2570 /* prepend radiotap information */
2571 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
2573 skb_set_mac_header(skb
, 0);
2574 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2575 skb
->pkt_type
= PACKET_OTHERHOST
;
2576 skb
->protocol
= htons(ETH_P_802_2
);
2578 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2579 if (!ieee80211_sdata_running(sdata
))
2582 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2583 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2587 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2589 skb2
->dev
= prev_dev
;
2590 netif_receive_skb(skb2
);
2594 prev_dev
= sdata
->dev
;
2595 sdata
->dev
->stats
.rx_packets
++;
2596 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2600 skb
->dev
= prev_dev
;
2601 netif_receive_skb(skb
);
2609 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2610 ieee80211_rx_result res
)
2613 case RX_DROP_MONITOR
:
2614 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2616 rx
->sta
->rx_dropped
++;
2619 struct ieee80211_rate
*rate
= NULL
;
2620 struct ieee80211_supported_band
*sband
;
2621 struct ieee80211_rx_status
*status
;
2623 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2625 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2626 if (!(status
->flag
& RX_FLAG_HT
))
2627 rate
= &sband
->bitrates
[status
->rate_idx
];
2629 ieee80211_rx_cooked_monitor(rx
, rate
);
2632 case RX_DROP_UNUSABLE
:
2633 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2635 rx
->sta
->rx_dropped
++;
2636 dev_kfree_skb(rx
->skb
);
2639 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2644 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2646 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2647 struct sk_buff
*skb
;
2649 #define CALL_RXH(rxh) \
2652 if (res != RX_CONTINUE) \
2656 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2657 if (rx
->local
->running_rx_handler
)
2660 rx
->local
->running_rx_handler
= true;
2662 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2663 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2666 * all the other fields are valid across frames
2667 * that belong to an aMPDU since they are on the
2668 * same TID from the same station
2672 CALL_RXH(ieee80211_rx_h_decrypt
)
2673 CALL_RXH(ieee80211_rx_h_check_more_data
)
2674 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2675 CALL_RXH(ieee80211_rx_h_sta_process
)
2676 CALL_RXH(ieee80211_rx_h_defragment
)
2677 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2678 /* must be after MMIC verify so header is counted in MPDU mic */
2679 #ifdef CONFIG_MAC80211_MESH
2680 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2681 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2683 CALL_RXH(ieee80211_rx_h_amsdu
)
2684 CALL_RXH(ieee80211_rx_h_data
)
2685 CALL_RXH(ieee80211_rx_h_ctrl
);
2686 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2687 CALL_RXH(ieee80211_rx_h_action
)
2688 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2689 CALL_RXH(ieee80211_rx_h_action_return
)
2690 CALL_RXH(ieee80211_rx_h_mgmt
)
2693 ieee80211_rx_handlers_result(rx
, res
);
2694 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2698 rx
->local
->running_rx_handler
= false;
2701 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2704 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2706 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2708 #define CALL_RXH(rxh) \
2711 if (res != RX_CONTINUE) \
2715 CALL_RXH(ieee80211_rx_h_passive_scan
)
2716 CALL_RXH(ieee80211_rx_h_check
)
2718 ieee80211_rx_reorder_ampdu(rx
);
2720 ieee80211_rx_handlers(rx
);
2724 ieee80211_rx_handlers_result(rx
, res
);
2730 * This function makes calls into the RX path, therefore
2731 * it has to be invoked under RCU read lock.
2733 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2735 struct ieee80211_rx_data rx
= {
2737 .sdata
= sta
->sdata
,
2738 .local
= sta
->local
,
2739 /* This is OK -- must be QoS data frame */
2740 .security_idx
= tid
,
2744 struct tid_ampdu_rx
*tid_agg_rx
;
2746 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2750 spin_lock(&tid_agg_rx
->reorder_lock
);
2751 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2752 spin_unlock(&tid_agg_rx
->reorder_lock
);
2754 ieee80211_rx_handlers(&rx
);
2757 /* main receive path */
2759 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2760 struct ieee80211_hdr
*hdr
)
2762 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2763 struct sk_buff
*skb
= rx
->skb
;
2764 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2765 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2766 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2768 switch (sdata
->vif
.type
) {
2769 case NL80211_IFTYPE_STATION
:
2770 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2773 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2774 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2775 sdata
->u
.mgd
.use_4addr
)
2777 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2780 case NL80211_IFTYPE_ADHOC
:
2783 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2786 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2787 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2789 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2790 } else if (!multicast
&&
2791 compare_ether_addr(sdata
->vif
.addr
,
2793 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2795 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2796 } else if (!rx
->sta
) {
2798 if (status
->flag
& RX_FLAG_HT
)
2799 rate_idx
= 0; /* TODO: HT rates */
2801 rate_idx
= status
->rate_idx
;
2802 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
2806 case NL80211_IFTYPE_MESH_POINT
:
2808 compare_ether_addr(sdata
->vif
.addr
,
2810 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2813 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2816 case NL80211_IFTYPE_AP_VLAN
:
2817 case NL80211_IFTYPE_AP
:
2819 if (compare_ether_addr(sdata
->vif
.addr
,
2822 } else if (!ieee80211_bssid_match(bssid
,
2825 * Accept public action frames even when the
2826 * BSSID doesn't match, this is used for P2P
2827 * and location updates. Note that mac80211
2828 * itself never looks at these frames.
2830 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2831 ieee80211_is_public_action(hdr
, skb
->len
))
2833 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2834 !ieee80211_is_beacon(hdr
->frame_control
))
2836 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2839 case NL80211_IFTYPE_WDS
:
2840 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2842 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2846 /* should never get here */
2855 * This function returns whether or not the SKB
2856 * was destined for RX processing or not, which,
2857 * if consume is true, is equivalent to whether
2858 * or not the skb was consumed.
2860 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2861 struct sk_buff
*skb
, bool consume
)
2863 struct ieee80211_local
*local
= rx
->local
;
2864 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2865 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2866 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2870 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2871 prepares
= prepare_for_handlers(rx
, hdr
);
2877 skb
= skb_copy(skb
, GFP_ATOMIC
);
2879 if (net_ratelimit())
2880 wiphy_debug(local
->hw
.wiphy
,
2881 "failed to copy skb for %s\n",
2889 ieee80211_invoke_rx_handlers(rx
);
2894 * This is the actual Rx frames handler. as it blongs to Rx path it must
2895 * be called with rcu_read_lock protection.
2897 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2898 struct sk_buff
*skb
)
2900 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2901 struct ieee80211_local
*local
= hw_to_local(hw
);
2902 struct ieee80211_sub_if_data
*sdata
;
2903 struct ieee80211_hdr
*hdr
;
2905 struct ieee80211_rx_data rx
;
2906 struct ieee80211_sub_if_data
*prev
;
2907 struct sta_info
*sta
, *tmp
, *prev_sta
;
2910 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2911 memset(&rx
, 0, sizeof(rx
));
2915 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2916 local
->dot11ReceivedFragmentCount
++;
2918 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2919 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
2920 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2921 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2923 if (ieee80211_is_mgmt(fc
))
2924 err
= skb_linearize(skb
);
2926 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2933 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2934 ieee80211_parse_qos(&rx
);
2935 ieee80211_verify_alignment(&rx
);
2937 if (ieee80211_is_data(fc
)) {
2940 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2947 rx
.sdata
= prev_sta
->sdata
;
2948 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2955 rx
.sdata
= prev_sta
->sdata
;
2957 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2965 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2966 if (!ieee80211_sdata_running(sdata
))
2969 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2970 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2974 * frame is destined for this interface, but if it's
2975 * not also for the previous one we handle that after
2976 * the loop to avoid copying the SKB once too much
2984 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2986 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2992 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2995 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3004 * This is the receive path handler. It is called by a low level driver when an
3005 * 802.11 MPDU is received from the hardware.
3007 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3009 struct ieee80211_local
*local
= hw_to_local(hw
);
3010 struct ieee80211_rate
*rate
= NULL
;
3011 struct ieee80211_supported_band
*sband
;
3012 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3014 WARN_ON_ONCE(softirq_count() == 0);
3016 if (WARN_ON(status
->band
< 0 ||
3017 status
->band
>= IEEE80211_NUM_BANDS
))
3020 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3021 if (WARN_ON(!sband
))
3025 * If we're suspending, it is possible although not too likely
3026 * that we'd be receiving frames after having already partially
3027 * quiesced the stack. We can't process such frames then since
3028 * that might, for example, cause stations to be added or other
3029 * driver callbacks be invoked.
3031 if (unlikely(local
->quiescing
|| local
->suspended
))
3035 * The same happens when we're not even started,
3036 * but that's worth a warning.
3038 if (WARN_ON(!local
->started
))
3041 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3043 * Validate the rate, unless a PLCP error means that
3044 * we probably can't have a valid rate here anyway.
3047 if (status
->flag
& RX_FLAG_HT
) {
3049 * rate_idx is MCS index, which can be [0-76]
3052 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3054 * Anything else would be some sort of driver or
3055 * hardware error. The driver should catch hardware
3058 if (WARN((status
->rate_idx
< 0 ||
3059 status
->rate_idx
> 76),
3060 "Rate marked as an HT rate but passed "
3061 "status->rate_idx is not "
3062 "an MCS index [0-76]: %d (0x%02x)\n",
3067 if (WARN_ON(status
->rate_idx
< 0 ||
3068 status
->rate_idx
>= sband
->n_bitrates
))
3070 rate
= &sband
->bitrates
[status
->rate_idx
];
3074 status
->rx_flags
= 0;
3077 * key references and virtual interfaces are protected using RCU
3078 * and this requires that we are in a read-side RCU section during
3079 * receive processing
3084 * Frames with failed FCS/PLCP checksum are not returned,
3085 * all other frames are returned without radiotap header
3086 * if it was previously present.
3087 * Also, frames with less than 16 bytes are dropped.
3089 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3095 ieee80211_tpt_led_trig_rx(local
,
3096 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3098 __ieee80211_rx_handle_packet(hw
, skb
);
3106 EXPORT_SYMBOL(ieee80211_rx
);
3108 /* This is a version of the rx handler that can be called from hard irq
3109 * context. Post the skb on the queue and schedule the tasklet */
3110 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3112 struct ieee80211_local
*local
= hw_to_local(hw
);
3114 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3116 skb
->pkt_type
= IEEE80211_RX_MSG
;
3117 skb_queue_tail(&local
->skb_queue
, skb
);
3118 tasklet_schedule(&local
->tasklet
);
3120 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);