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
,
106 int rtap_len
, bool has_fcs
)
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 (has_fcs
&& (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
++ = local
->hw
.radiotap_mcs_details
;
209 if (status
->flag
& RX_FLAG_SHORT_GI
)
210 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
211 if (status
->flag
& RX_FLAG_40MHZ
)
212 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
213 if (status
->flag
& RX_FLAG_HT_GF
)
214 *pos
|= IEEE80211_RADIOTAP_MCS_FMT_GF
;
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
,
300 skb_reset_mac_header(skb
);
301 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
302 skb
->pkt_type
= PACKET_OTHERHOST
;
303 skb
->protocol
= htons(ETH_P_802_2
);
305 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
306 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
309 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
312 if (!ieee80211_sdata_running(sdata
))
316 skb2
= skb_clone(skb
, GFP_ATOMIC
);
318 skb2
->dev
= prev_dev
;
319 netif_receive_skb(skb2
);
323 prev_dev
= sdata
->dev
;
324 sdata
->dev
->stats
.rx_packets
++;
325 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
330 netif_receive_skb(skb
);
338 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
340 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
341 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
342 int tid
, seqno_idx
, security_idx
;
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
346 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
347 /* frame has qos control */
348 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
349 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
350 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
364 * We also use that counter for non-QoS STAs.
366 seqno_idx
= NUM_RX_DATA_QUEUES
;
368 if (ieee80211_is_mgmt(hdr
->frame_control
))
369 security_idx
= NUM_RX_DATA_QUEUES
;
373 rx
->seqno_idx
= seqno_idx
;
374 rx
->security_idx
= security_idx
;
375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
381 * DOC: Packet alignment
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
401 * Padding like Atheros hardware adds which is between the 802.11 header and
402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
405 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
409 "unaligned packet at 0x%p\n", rx
->skb
->data
);
416 static ieee80211_rx_result debug_noinline
417 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
419 struct ieee80211_local
*local
= rx
->local
;
420 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
421 struct sk_buff
*skb
= rx
->skb
;
423 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
424 !local
->sched_scanning
))
427 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
428 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
429 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
430 local
->sched_scanning
)
431 return ieee80211_scan_rx(rx
->sdata
, skb
);
433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
435 return RX_DROP_UNUSABLE
;
439 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
441 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
443 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
446 return ieee80211_is_robust_mgmt_frame(hdr
);
450 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
452 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
454 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
457 return ieee80211_is_robust_mgmt_frame(hdr
);
461 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
462 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
464 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
465 struct ieee80211_mmie
*mmie
;
467 if (skb
->len
< 24 + sizeof(*mmie
) ||
468 !is_multicast_ether_addr(hdr
->da
))
471 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
472 return -1; /* not a robust management frame */
474 mmie
= (struct ieee80211_mmie
*)
475 (skb
->data
+ skb
->len
- sizeof(*mmie
));
476 if (mmie
->element_id
!= WLAN_EID_MMIE
||
477 mmie
->length
!= sizeof(*mmie
) - 2)
480 return le16_to_cpu(mmie
->key_id
);
484 static ieee80211_rx_result
485 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
487 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
488 char *dev_addr
= rx
->sdata
->vif
.addr
;
490 if (ieee80211_is_data(hdr
->frame_control
)) {
491 if (is_multicast_ether_addr(hdr
->addr1
)) {
492 if (ieee80211_has_tods(hdr
->frame_control
) ||
493 !ieee80211_has_fromds(hdr
->frame_control
))
494 return RX_DROP_MONITOR
;
495 if (ether_addr_equal(hdr
->addr3
, dev_addr
))
496 return RX_DROP_MONITOR
;
498 if (!ieee80211_has_a4(hdr
->frame_control
))
499 return RX_DROP_MONITOR
;
500 if (ether_addr_equal(hdr
->addr4
, dev_addr
))
501 return RX_DROP_MONITOR
;
505 /* If there is not an established peer link and this is not a peer link
506 * establisment frame, beacon or probe, drop the frame.
509 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
510 struct ieee80211_mgmt
*mgmt
;
512 if (!ieee80211_is_mgmt(hdr
->frame_control
))
513 return RX_DROP_MONITOR
;
515 if (ieee80211_is_action(hdr
->frame_control
)) {
517 mgmt
= (struct ieee80211_mgmt
*)hdr
;
518 category
= mgmt
->u
.action
.category
;
519 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
520 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
521 return RX_DROP_MONITOR
;
525 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
526 ieee80211_is_probe_resp(hdr
->frame_control
) ||
527 ieee80211_is_beacon(hdr
->frame_control
) ||
528 ieee80211_is_auth(hdr
->frame_control
))
531 return RX_DROP_MONITOR
;
538 #define SEQ_MODULO 0x1000
539 #define SEQ_MASK 0xfff
541 static inline int seq_less(u16 sq1
, u16 sq2
)
543 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
546 static inline u16
seq_inc(u16 sq
)
548 return (sq
+ 1) & SEQ_MASK
;
551 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
553 return (sq1
- sq2
) & SEQ_MASK
;
557 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
558 struct tid_ampdu_rx
*tid_agg_rx
,
561 struct ieee80211_local
*local
= hw_to_local(hw
);
562 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
563 struct ieee80211_rx_status
*status
;
565 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
570 /* release the frame from the reorder ring buffer */
571 tid_agg_rx
->stored_mpdu_num
--;
572 tid_agg_rx
->reorder_buf
[index
] = NULL
;
573 status
= IEEE80211_SKB_RXCB(skb
);
574 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
575 skb_queue_tail(&local
->rx_skb_queue
, skb
);
578 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
581 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
582 struct tid_ampdu_rx
*tid_agg_rx
,
587 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
589 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
590 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
591 tid_agg_rx
->buf_size
;
592 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
597 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
598 * the skb was added to the buffer longer than this time ago, the earlier
599 * frames that have not yet been received are assumed to be lost and the skb
600 * can be released for processing. This may also release other skb's from the
601 * reorder buffer if there are no additional gaps between the frames.
603 * Callers must hold tid_agg_rx->reorder_lock.
605 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
607 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
608 struct tid_ampdu_rx
*tid_agg_rx
)
612 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
614 /* release the buffer until next missing frame */
615 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
616 tid_agg_rx
->buf_size
;
617 if (!tid_agg_rx
->reorder_buf
[index
] &&
618 tid_agg_rx
->stored_mpdu_num
) {
620 * No buffers ready to be released, but check whether any
621 * frames in the reorder buffer have timed out.
624 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
625 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
626 if (!tid_agg_rx
->reorder_buf
[j
]) {
631 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
632 HT_RX_REORDER_BUF_TIMEOUT
))
633 goto set_release_timer
;
635 #ifdef CONFIG_MAC80211_HT_DEBUG
637 wiphy_debug(hw
->wiphy
,
638 "release an RX reorder frame due to timeout on earlier frames\n");
640 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
643 * Increment the head seq# also for the skipped slots.
645 tid_agg_rx
->head_seq_num
=
646 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
649 } else while (tid_agg_rx
->reorder_buf
[index
]) {
650 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
651 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
652 tid_agg_rx
->buf_size
;
655 if (tid_agg_rx
->stored_mpdu_num
) {
656 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
657 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
659 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
660 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
661 if (tid_agg_rx
->reorder_buf
[j
])
667 mod_timer(&tid_agg_rx
->reorder_timer
,
668 tid_agg_rx
->reorder_time
[j
] + 1 +
669 HT_RX_REORDER_BUF_TIMEOUT
);
671 del_timer(&tid_agg_rx
->reorder_timer
);
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
680 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
681 struct tid_ampdu_rx
*tid_agg_rx
,
684 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
685 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
686 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
687 u16 head_seq_num
, buf_size
;
691 spin_lock(&tid_agg_rx
->reorder_lock
);
693 buf_size
= tid_agg_rx
->buf_size
;
694 head_seq_num
= tid_agg_rx
->head_seq_num
;
696 /* frame with out of date sequence number */
697 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
703 * If frame the sequence number exceeds our buffering window
704 * size release some previous frames to make room for this one.
706 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
707 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
708 /* release stored frames up to new head to stack */
709 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
712 /* Now the new frame is always in the range of the reordering buffer */
714 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
716 /* check if we already stored this frame */
717 if (tid_agg_rx
->reorder_buf
[index
]) {
723 * If the current MPDU is in the right order and nothing else
724 * is stored we can process it directly, no need to buffer it.
725 * If it is first but there's something stored, we may be able
726 * to release frames after this one.
728 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
729 tid_agg_rx
->stored_mpdu_num
== 0) {
730 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
735 /* put the frame in the reordering buffer */
736 tid_agg_rx
->reorder_buf
[index
] = skb
;
737 tid_agg_rx
->reorder_time
[index
] = jiffies
;
738 tid_agg_rx
->stored_mpdu_num
++;
739 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
742 spin_unlock(&tid_agg_rx
->reorder_lock
);
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
750 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
752 struct sk_buff
*skb
= rx
->skb
;
753 struct ieee80211_local
*local
= rx
->local
;
754 struct ieee80211_hw
*hw
= &local
->hw
;
755 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
756 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
757 struct sta_info
*sta
= rx
->sta
;
758 struct tid_ampdu_rx
*tid_agg_rx
;
762 if (!ieee80211_is_data_qos(hdr
->frame_control
))
766 * filter the QoS data rx stream according to
767 * STA/TID and check if this STA/TID is on aggregation
773 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
774 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
775 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
777 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
781 /* qos null data frames are excluded */
782 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
785 /* not part of a BA session */
786 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
787 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
790 /* not actually part of this BA session */
791 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
794 /* new, potentially un-ordered, ampdu frame - process it */
796 /* reset session timer */
797 if (tid_agg_rx
->timeout
)
798 tid_agg_rx
->last_rx
= jiffies
;
800 /* if this mpdu is fragmented - terminate rx aggregation session */
801 sc
= le16_to_cpu(hdr
->seq_ctrl
);
802 if (sc
& IEEE80211_SCTL_FRAG
) {
803 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
804 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
805 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
810 * No locking needed -- we will only ever process one
811 * RX packet at a time, and thus own tid_agg_rx. All
812 * other code manipulating it needs to (and does) make
813 * sure that we cannot get to it any more before doing
816 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
820 skb_queue_tail(&local
->rx_skb_queue
, skb
);
823 static ieee80211_rx_result debug_noinline
824 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
826 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
827 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
829 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
830 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
831 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
832 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
834 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
835 rx
->local
->dot11FrameDuplicateCount
++;
836 rx
->sta
->num_duplicates
++;
838 return RX_DROP_UNUSABLE
;
840 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
843 if (unlikely(rx
->skb
->len
< 16)) {
844 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
845 return RX_DROP_MONITOR
;
848 /* Drop disallowed frame classes based on STA auth/assoc state;
849 * IEEE 802.11, Chap 5.5.
851 * mac80211 filters only based on association state, i.e. it drops
852 * Class 3 frames from not associated stations. hostapd sends
853 * deauth/disassoc frames when needed. In addition, hostapd is
854 * responsible for filtering on both auth and assoc states.
857 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
858 return ieee80211_rx_mesh_check(rx
);
860 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
861 ieee80211_is_pspoll(hdr
->frame_control
)) &&
862 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
863 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
864 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
866 * accept port control frames from the AP even when it's not
867 * yet marked ASSOC to prevent a race where we don't set the
868 * assoc bit quickly enough before it sends the first frame
870 if (rx
->sta
&& rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
871 ieee80211_is_data_present(hdr
->frame_control
)) {
875 payload
= rx
->skb
->data
+
876 ieee80211_hdrlen(hdr
->frame_control
);
877 ethertype
= (payload
[6] << 8) | payload
[7];
878 if (cpu_to_be16(ethertype
) ==
879 rx
->sdata
->control_port_protocol
)
883 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
884 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
887 return RX_DROP_UNUSABLE
;
889 return RX_DROP_MONITOR
;
896 static ieee80211_rx_result debug_noinline
897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
899 struct sk_buff
*skb
= rx
->skb
;
900 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
901 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
904 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
905 struct ieee80211_key
*sta_ptk
= NULL
;
906 int mmie_keyidx
= -1;
912 * There are four types of keys:
914 * - IGTK (group keys for management frames)
915 * - PTK (pairwise keys)
916 * - STK (station-to-station pairwise keys)
918 * When selecting a key, we have to distinguish between multicast
919 * (including broadcast) and unicast frames, the latter can only
920 * use PTKs and STKs while the former always use GTKs and IGTKs.
921 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
922 * unicast frames can also use key indices like GTKs. Hence, if we
923 * don't have a PTK/STK we check the key index for a WEP key.
925 * Note that in a regular BSS, multicast frames are sent by the
926 * AP only, associated stations unicast the frame to the AP first
927 * which then multicasts it on their behalf.
929 * There is also a slight problem in IBSS mode: GTKs are negotiated
930 * with each station, that is something we don't currently handle.
931 * The spec seems to expect that one negotiates the same key with
932 * every station but there's no such requirement; VLANs could be
937 * No point in finding a key and decrypting if the frame is neither
938 * addressed to us nor a multicast frame.
940 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
943 /* start without a key */
947 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
949 fc
= hdr
->frame_control
;
951 if (!ieee80211_has_protected(fc
))
952 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
954 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
956 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
957 (status
->flag
& RX_FLAG_IV_STRIPPED
))
959 /* Skip decryption if the frame is not protected. */
960 if (!ieee80211_has_protected(fc
))
962 } else if (mmie_keyidx
>= 0) {
963 /* Broadcast/multicast robust management frame / BIP */
964 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
965 (status
->flag
& RX_FLAG_IV_STRIPPED
))
968 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
969 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
970 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
972 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
974 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
975 } else if (!ieee80211_has_protected(fc
)) {
977 * The frame was not protected, so skip decryption. However, we
978 * need to set rx->key if there is a key that could have been
979 * used so that the frame may be dropped if encryption would
980 * have been expected.
982 struct ieee80211_key
*key
= NULL
;
983 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
986 if (ieee80211_is_mgmt(fc
) &&
987 is_multicast_ether_addr(hdr
->addr1
) &&
988 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
992 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
993 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
999 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
1000 key
= rcu_dereference(sdata
->keys
[i
]);
1012 * The device doesn't give us the IV so we won't be
1013 * able to look up the key. That's ok though, we
1014 * don't need to decrypt the frame, we just won't
1015 * be able to keep statistics accurate.
1016 * Except for key threshold notifications, should
1017 * we somehow allow the driver to tell us which key
1018 * the hardware used if this flag is set?
1020 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1021 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1024 hdrlen
= ieee80211_hdrlen(fc
);
1026 if (rx
->skb
->len
< 8 + hdrlen
)
1027 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1030 * no need to call ieee80211_wep_get_keyidx,
1031 * it verifies a bunch of things we've done already
1033 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1034 keyidx
= keyid
>> 6;
1036 /* check per-station GTK first, if multicast packet */
1037 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1038 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1040 /* if not found, try default key */
1042 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1045 * RSNA-protected unicast frames should always be
1046 * sent with pairwise or station-to-station keys,
1047 * but for WEP we allow using a key index as well.
1050 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1051 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1052 !is_multicast_ether_addr(hdr
->addr1
))
1058 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1059 return RX_DROP_MONITOR
;
1061 rx
->key
->tx_rx_count
++;
1062 /* TODO: add threshold stuff again */
1064 return RX_DROP_MONITOR
;
1067 switch (rx
->key
->conf
.cipher
) {
1068 case WLAN_CIPHER_SUITE_WEP40
:
1069 case WLAN_CIPHER_SUITE_WEP104
:
1070 result
= ieee80211_crypto_wep_decrypt(rx
);
1072 case WLAN_CIPHER_SUITE_TKIP
:
1073 result
= ieee80211_crypto_tkip_decrypt(rx
);
1075 case WLAN_CIPHER_SUITE_CCMP
:
1076 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1078 case WLAN_CIPHER_SUITE_AES_CMAC
:
1079 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1083 * We can reach here only with HW-only algorithms
1084 * but why didn't it decrypt the frame?!
1086 return RX_DROP_UNUSABLE
;
1089 /* the hdr variable is invalid after the decrypt handlers */
1091 /* either the frame has been decrypted or will be dropped */
1092 status
->flag
|= RX_FLAG_DECRYPTED
;
1097 static ieee80211_rx_result debug_noinline
1098 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1100 struct ieee80211_local
*local
;
1101 struct ieee80211_hdr
*hdr
;
1102 struct sk_buff
*skb
;
1106 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1108 if (!local
->pspolling
)
1111 if (!ieee80211_has_fromds(hdr
->frame_control
))
1112 /* this is not from AP */
1115 if (!ieee80211_is_data(hdr
->frame_control
))
1118 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1119 /* AP has no more frames buffered for us */
1120 local
->pspolling
= false;
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local
, rx
->sdata
);
1130 static void ap_sta_ps_start(struct sta_info
*sta
)
1132 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1133 struct ieee80211_local
*local
= sdata
->local
;
1135 atomic_inc(&sdata
->bss
->num_sta_ps
);
1136 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1137 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1138 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1139 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1140 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1141 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1142 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1145 static void ap_sta_ps_end(struct sta_info
*sta
)
1147 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1148 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1149 sta
->sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1150 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1152 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1154 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1155 sta
->sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1160 ieee80211_sta_ps_deliver_wakeup(sta
);
1163 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1165 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1168 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1170 /* Don't let the same PS state be set twice */
1171 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1172 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1176 ap_sta_ps_start(sta_inf
);
1178 ap_sta_ps_end(sta_inf
);
1182 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1184 static ieee80211_rx_result debug_noinline
1185 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1187 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1188 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1189 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1192 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1195 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1196 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1204 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1212 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1215 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1216 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1217 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1218 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1220 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx
->skb
);
1228 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1229 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1230 ieee80211_has_pm(hdr
->frame_control
) &&
1231 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1232 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1233 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1234 ac
= ieee802_1d_to_ac
[tid
& 7];
1237 * If this AC is not trigger-enabled do nothing.
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1243 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1246 /* if we are in a service period, do nothing */
1247 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1250 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1251 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1253 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1259 static ieee80211_rx_result debug_noinline
1260 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1262 struct sta_info
*sta
= rx
->sta
;
1263 struct sk_buff
*skb
= rx
->skb
;
1264 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1265 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1275 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1276 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1277 NL80211_IFTYPE_ADHOC
);
1278 if (ether_addr_equal(bssid
, rx
->sdata
->u
.ibss
.bssid
)) {
1279 sta
->last_rx
= jiffies
;
1280 if (ieee80211_is_data(hdr
->frame_control
)) {
1281 sta
->last_rx_rate_idx
= status
->rate_idx
;
1282 sta
->last_rx_rate_flag
= status
->flag
;
1285 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
1290 sta
->last_rx
= jiffies
;
1291 if (ieee80211_is_data(hdr
->frame_control
)) {
1292 sta
->last_rx_rate_idx
= status
->rate_idx
;
1293 sta
->last_rx_rate_flag
= status
->flag
;
1297 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1300 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1301 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1303 sta
->rx_fragments
++;
1304 sta
->rx_bytes
+= rx
->skb
->len
;
1305 if (!(status
->flag
& RX_FLAG_NO_SIGNAL_VAL
)) {
1306 sta
->last_signal
= status
->signal
;
1307 ewma_add(&sta
->avg_signal
, -status
->signal
);
1311 * Change STA power saving mode only at the end of a frame
1312 * exchange sequence.
1314 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1315 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1316 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1317 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1318 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1319 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1321 * Ignore doze->wake transitions that are
1322 * indicated by non-data frames, the standard
1323 * is unclear here, but for example going to
1324 * PS mode and then scanning would cause a
1325 * doze->wake transition for the probe request,
1326 * and that is clearly undesirable.
1328 if (ieee80211_is_data(hdr
->frame_control
) &&
1329 !ieee80211_has_pm(hdr
->frame_control
))
1332 if (ieee80211_has_pm(hdr
->frame_control
))
1333 ap_sta_ps_start(sta
);
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1341 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1342 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1343 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1346 * If we receive a 4-addr nullfunc frame from a STA
1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
1351 if (ieee80211_has_a4(hdr
->frame_control
) &&
1352 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1353 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1354 !rx
->sdata
->u
.vlan
.sta
))) {
1355 if (!test_and_set_sta_flag(sta
, WLAN_STA_4ADDR_EVENT
))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx
->sdata
->dev
, sta
->sta
.addr
,
1359 return RX_DROP_MONITOR
;
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1366 dev_kfree_skb(rx
->skb
);
1371 } /* ieee80211_rx_h_sta_process */
1373 static inline struct ieee80211_fragment_entry
*
1374 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1375 unsigned int frag
, unsigned int seq
, int rx_queue
,
1376 struct sk_buff
**skb
)
1378 struct ieee80211_fragment_entry
*entry
;
1381 idx
= sdata
->fragment_next
;
1382 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1383 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1384 sdata
->fragment_next
= 0;
1386 if (!skb_queue_empty(&entry
->skb_list
)) {
1387 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1388 struct ieee80211_hdr
*hdr
=
1389 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1390 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1391 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1392 "addr1=%pM addr2=%pM\n",
1394 jiffies
- entry
->first_frag_time
, entry
->seq
,
1395 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1397 __skb_queue_purge(&entry
->skb_list
);
1400 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1402 entry
->first_frag_time
= jiffies
;
1404 entry
->rx_queue
= rx_queue
;
1405 entry
->last_frag
= frag
;
1407 entry
->extra_len
= 0;
1412 static inline struct ieee80211_fragment_entry
*
1413 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1414 unsigned int frag
, unsigned int seq
,
1415 int rx_queue
, struct ieee80211_hdr
*hdr
)
1417 struct ieee80211_fragment_entry
*entry
;
1420 idx
= sdata
->fragment_next
;
1421 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1422 struct ieee80211_hdr
*f_hdr
;
1426 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1428 entry
= &sdata
->fragments
[idx
];
1429 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1430 entry
->rx_queue
!= rx_queue
||
1431 entry
->last_frag
+ 1 != frag
)
1434 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1437 * Check ftype and addresses are equal, else check next fragment
1439 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1440 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1441 !ether_addr_equal(hdr
->addr1
, f_hdr
->addr1
) ||
1442 !ether_addr_equal(hdr
->addr2
, f_hdr
->addr2
))
1445 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1446 __skb_queue_purge(&entry
->skb_list
);
1455 static ieee80211_rx_result debug_noinline
1456 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1458 struct ieee80211_hdr
*hdr
;
1461 unsigned int frag
, seq
;
1462 struct ieee80211_fragment_entry
*entry
;
1463 struct sk_buff
*skb
;
1464 struct ieee80211_rx_status
*status
;
1466 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1467 fc
= hdr
->frame_control
;
1468 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1469 frag
= sc
& IEEE80211_SCTL_FRAG
;
1471 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1472 (rx
->skb
)->len
< 24 ||
1473 is_multicast_ether_addr(hdr
->addr1
))) {
1474 /* not fragmented */
1477 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1479 if (skb_linearize(rx
->skb
))
1480 return RX_DROP_UNUSABLE
;
1483 * skb_linearize() might change the skb->data and
1484 * previously cached variables (in this case, hdr) need to
1485 * be refreshed with the new data.
1487 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1488 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1491 /* This is the first fragment of a new frame. */
1492 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1493 rx
->seqno_idx
, &(rx
->skb
));
1494 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1495 ieee80211_has_protected(fc
)) {
1496 int queue
= rx
->security_idx
;
1497 /* Store CCMP PN so that we can verify that the next
1498 * fragment has a sequential PN value. */
1500 memcpy(entry
->last_pn
,
1501 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1507 /* This is a fragment for a frame that should already be pending in
1508 * fragment cache. Add this fragment to the end of the pending entry.
1510 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1511 rx
->seqno_idx
, hdr
);
1513 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1514 return RX_DROP_MONITOR
;
1517 /* Verify that MPDUs within one MSDU have sequential PN values.
1518 * (IEEE 802.11i, 8.3.3.4.5) */
1521 u8 pn
[CCMP_PN_LEN
], *rpn
;
1523 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1524 return RX_DROP_UNUSABLE
;
1525 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1526 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1531 queue
= rx
->security_idx
;
1532 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1533 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1534 return RX_DROP_UNUSABLE
;
1535 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1538 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1539 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1540 entry
->last_frag
= frag
;
1541 entry
->extra_len
+= rx
->skb
->len
;
1542 if (ieee80211_has_morefrags(fc
)) {
1547 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1548 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1549 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1550 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1552 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1553 __skb_queue_purge(&entry
->skb_list
);
1554 return RX_DROP_UNUSABLE
;
1557 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1558 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1562 /* Complete frame has been reassembled - process it now */
1563 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1564 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1568 rx
->sta
->rx_packets
++;
1569 if (is_multicast_ether_addr(hdr
->addr1
))
1570 rx
->local
->dot11MulticastReceivedFrameCount
++;
1572 ieee80211_led_rx(rx
->local
);
1577 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1579 if (unlikely(!rx
->sta
||
1580 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1587 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1589 struct sk_buff
*skb
= rx
->skb
;
1590 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1593 * Pass through unencrypted frames if the hardware has
1594 * decrypted them already.
1596 if (status
->flag
& RX_FLAG_DECRYPTED
)
1599 /* Drop unencrypted frames if key is set. */
1600 if (unlikely(!ieee80211_has_protected(fc
) &&
1601 !ieee80211_is_nullfunc(fc
) &&
1602 ieee80211_is_data(fc
) &&
1603 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1610 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1612 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1613 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1614 __le16 fc
= hdr
->frame_control
;
1617 * Pass through unencrypted frames if the hardware has
1618 * decrypted them already.
1620 if (status
->flag
& RX_FLAG_DECRYPTED
)
1623 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1624 if (unlikely(!ieee80211_has_protected(fc
) &&
1625 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1627 if (ieee80211_is_deauth(fc
))
1628 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1631 else if (ieee80211_is_disassoc(fc
))
1632 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1637 /* BIP does not use Protected field, so need to check MMIE */
1638 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1639 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1640 if (ieee80211_is_deauth(fc
))
1641 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1644 else if (ieee80211_is_disassoc(fc
))
1645 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1651 * When using MFP, Action frames are not allowed prior to
1652 * having configured keys.
1654 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1655 ieee80211_is_robust_mgmt_frame(
1656 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1664 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1666 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1667 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1668 bool check_port_control
= false;
1669 struct ethhdr
*ehdr
;
1672 *port_control
= false;
1673 if (ieee80211_has_a4(hdr
->frame_control
) &&
1674 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1677 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1678 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1680 if (!sdata
->u
.mgd
.use_4addr
)
1683 check_port_control
= true;
1686 if (is_multicast_ether_addr(hdr
->addr1
) &&
1687 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1690 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1694 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1695 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1696 *port_control
= true;
1697 else if (check_port_control
)
1704 * requires that rx->skb is a frame with ethernet header
1706 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1708 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1709 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1710 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1713 * Allow EAPOL frames to us/the PAE group address regardless
1714 * of whether the frame was encrypted or not.
1716 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1717 (ether_addr_equal(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) ||
1718 ether_addr_equal(ehdr
->h_dest
, pae_group_addr
)))
1721 if (ieee80211_802_1x_port_control(rx
) ||
1722 ieee80211_drop_unencrypted(rx
, fc
))
1729 * requires that rx->skb is a frame with ethernet header
1732 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1734 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1735 struct net_device
*dev
= sdata
->dev
;
1736 struct sk_buff
*skb
, *xmit_skb
;
1737 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1738 struct sta_info
*dsta
;
1739 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1744 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1745 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1746 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1747 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1748 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1749 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1751 * send multicast frames both to higher layers in
1752 * local net stack and back to the wireless medium
1754 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1756 net_dbg_ratelimited("%s: failed to clone multicast frame\n",
1759 dsta
= sta_info_get(sdata
, skb
->data
);
1762 * The destination station is associated to
1763 * this AP (in this VLAN), so send the frame
1764 * directly to it and do not pass it to local
1774 int align __maybe_unused
;
1776 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1778 * 'align' will only take the values 0 or 2 here
1779 * since all frames are required to be aligned
1780 * to 2-byte boundaries when being passed to
1781 * mac80211. That also explains the __skb_push()
1784 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1786 if (WARN_ON(skb_headroom(skb
) < 3)) {
1790 u8
*data
= skb
->data
;
1791 size_t len
= skb_headlen(skb
);
1793 memmove(skb
->data
, data
, len
);
1794 skb_set_tail_pointer(skb
, len
);
1800 /* deliver to local stack */
1801 skb
->protocol
= eth_type_trans(skb
, dev
);
1802 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1803 netif_receive_skb(skb
);
1809 * Send to wireless media and increase priority by 256 to
1810 * keep the received priority instead of reclassifying
1811 * the frame (see cfg80211_classify8021d).
1813 xmit_skb
->priority
+= 256;
1814 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1815 skb_reset_network_header(xmit_skb
);
1816 skb_reset_mac_header(xmit_skb
);
1817 dev_queue_xmit(xmit_skb
);
1821 static ieee80211_rx_result debug_noinline
1822 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1824 struct net_device
*dev
= rx
->sdata
->dev
;
1825 struct sk_buff
*skb
= rx
->skb
;
1826 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1827 __le16 fc
= hdr
->frame_control
;
1828 struct sk_buff_head frame_list
;
1829 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1831 if (unlikely(!ieee80211_is_data(fc
)))
1834 if (unlikely(!ieee80211_is_data_present(fc
)))
1835 return RX_DROP_MONITOR
;
1837 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1840 if (ieee80211_has_a4(hdr
->frame_control
) &&
1841 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1842 !rx
->sdata
->u
.vlan
.sta
)
1843 return RX_DROP_UNUSABLE
;
1845 if (is_multicast_ether_addr(hdr
->addr1
) &&
1846 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1847 rx
->sdata
->u
.vlan
.sta
) ||
1848 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1849 rx
->sdata
->u
.mgd
.use_4addr
)))
1850 return RX_DROP_UNUSABLE
;
1853 __skb_queue_head_init(&frame_list
);
1855 if (skb_linearize(skb
))
1856 return RX_DROP_UNUSABLE
;
1858 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1859 rx
->sdata
->vif
.type
,
1860 rx
->local
->hw
.extra_tx_headroom
, true);
1862 while (!skb_queue_empty(&frame_list
)) {
1863 rx
->skb
= __skb_dequeue(&frame_list
);
1865 if (!ieee80211_frame_allowed(rx
, fc
)) {
1866 dev_kfree_skb(rx
->skb
);
1869 dev
->stats
.rx_packets
++;
1870 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1872 ieee80211_deliver_skb(rx
);
1878 #ifdef CONFIG_MAC80211_MESH
1879 static ieee80211_rx_result
1880 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1882 struct ieee80211_hdr
*fwd_hdr
, *hdr
;
1883 struct ieee80211_tx_info
*info
;
1884 struct ieee80211s_hdr
*mesh_hdr
;
1885 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1886 struct ieee80211_local
*local
= rx
->local
;
1887 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1888 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1889 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1890 __le16 reason
= cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD
);
1893 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1894 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1895 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1897 /* frame is in RMC, don't forward */
1898 if (ieee80211_is_data(hdr
->frame_control
) &&
1899 is_multicast_ether_addr(hdr
->addr1
) &&
1900 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1901 return RX_DROP_MONITOR
;
1903 if (!ieee80211_is_data(hdr
->frame_control
))
1907 return RX_DROP_MONITOR
;
1909 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1910 struct mesh_path
*mppath
;
1914 if (is_multicast_ether_addr(hdr
->addr1
)) {
1915 mpp_addr
= hdr
->addr3
;
1916 proxied_addr
= mesh_hdr
->eaddr1
;
1918 mpp_addr
= hdr
->addr4
;
1919 proxied_addr
= mesh_hdr
->eaddr2
;
1923 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1925 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1927 spin_lock_bh(&mppath
->state_lock
);
1928 if (!ether_addr_equal(mppath
->mpp
, mpp_addr
))
1929 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1930 spin_unlock_bh(&mppath
->state_lock
);
1935 /* Frame has reached destination. Don't forward */
1936 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1937 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr3
))
1940 q
= ieee80211_select_queue_80211(local
, skb
, hdr
);
1941 if (ieee80211_queue_stopped(&local
->hw
, q
)) {
1942 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_congestion
);
1943 return RX_DROP_MONITOR
;
1945 skb_set_queue_mapping(skb
, q
);
1947 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1950 if (!--mesh_hdr
->ttl
) {
1951 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh
, dropped_frames_ttl
);
1952 return RX_DROP_MONITOR
;
1955 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
1958 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1960 net_dbg_ratelimited("%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 (!ether_addr_equal(mgmt
->da
, sdata
->vif
.addr
)) {
2125 /* Not to own unicast address */
2129 if (!ether_addr_equal(mgmt
->sa
, sdata
->u
.mgd
.bssid
) ||
2130 !ether_addr_equal(mgmt
->bssid
, sdata
->u
.mgd
.bssid
)) {
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 (!ether_addr_equal(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 * 802.11-2012 9.24.4.
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 if (is_multicast_ether_addr(mgmt
->da
))
2469 return RX_DROP_MONITOR
;
2471 /* do not return rejected action frames */
2472 if (mgmt
->u
.action
.category
& 0x80)
2473 return RX_DROP_UNUSABLE
;
2475 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2478 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2480 nmgmt
->u
.action
.category
|= 0x80;
2481 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2482 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2484 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2486 ieee80211_tx_skb(rx
->sdata
, nskb
);
2488 dev_kfree_skb(rx
->skb
);
2492 static ieee80211_rx_result debug_noinline
2493 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2495 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2496 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2499 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2501 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2502 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2503 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2504 return RX_DROP_MONITOR
;
2507 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2508 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2509 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2510 /* process for all: mesh, mlme, ibss */
2512 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP
):
2513 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP
):
2514 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2515 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2516 if (is_multicast_ether_addr(mgmt
->da
) &&
2517 !is_broadcast_ether_addr(mgmt
->da
))
2518 return RX_DROP_MONITOR
;
2520 /* process only for station */
2521 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2522 return RX_DROP_MONITOR
;
2524 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2525 /* process only for ibss */
2526 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2527 return RX_DROP_MONITOR
;
2530 return RX_DROP_MONITOR
;
2533 /* queue up frame and kick off work to process it */
2534 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2535 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2536 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2538 rx
->sta
->rx_packets
++;
2543 /* TODO: use IEEE80211_RX_FRAGMENTED */
2544 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2545 struct ieee80211_rate
*rate
)
2547 struct ieee80211_sub_if_data
*sdata
;
2548 struct ieee80211_local
*local
= rx
->local
;
2549 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2550 struct net_device
*prev_dev
= NULL
;
2551 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2552 int needed_headroom
;
2555 * If cooked monitor has been processed already, then
2556 * don't do it again. If not, set the flag.
2558 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2560 rx
->flags
|= IEEE80211_RX_CMNTR
;
2562 /* If there are no cooked monitor interfaces, just free the SKB */
2563 if (!local
->cooked_mntrs
)
2566 /* room for the radiotap header based on driver features */
2567 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
2569 if (skb_headroom(skb
) < needed_headroom
&&
2570 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
))
2573 /* prepend radiotap information */
2574 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
,
2577 skb_set_mac_header(skb
, 0);
2578 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2579 skb
->pkt_type
= PACKET_OTHERHOST
;
2580 skb
->protocol
= htons(ETH_P_802_2
);
2582 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2583 if (!ieee80211_sdata_running(sdata
))
2586 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2587 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2591 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2593 skb2
->dev
= prev_dev
;
2594 netif_receive_skb(skb2
);
2598 prev_dev
= sdata
->dev
;
2599 sdata
->dev
->stats
.rx_packets
++;
2600 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2604 skb
->dev
= prev_dev
;
2605 netif_receive_skb(skb
);
2613 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2614 ieee80211_rx_result res
)
2617 case RX_DROP_MONITOR
:
2618 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2620 rx
->sta
->rx_dropped
++;
2623 struct ieee80211_rate
*rate
= NULL
;
2624 struct ieee80211_supported_band
*sband
;
2625 struct ieee80211_rx_status
*status
;
2627 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2629 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2630 if (!(status
->flag
& RX_FLAG_HT
))
2631 rate
= &sband
->bitrates
[status
->rate_idx
];
2633 ieee80211_rx_cooked_monitor(rx
, rate
);
2636 case RX_DROP_UNUSABLE
:
2637 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2639 rx
->sta
->rx_dropped
++;
2640 dev_kfree_skb(rx
->skb
);
2643 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2648 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2650 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2651 struct sk_buff
*skb
;
2653 #define CALL_RXH(rxh) \
2656 if (res != RX_CONTINUE) \
2660 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2661 if (rx
->local
->running_rx_handler
)
2664 rx
->local
->running_rx_handler
= true;
2666 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2667 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2670 * all the other fields are valid across frames
2671 * that belong to an aMPDU since they are on the
2672 * same TID from the same station
2676 CALL_RXH(ieee80211_rx_h_decrypt
)
2677 CALL_RXH(ieee80211_rx_h_check_more_data
)
2678 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2679 CALL_RXH(ieee80211_rx_h_sta_process
)
2680 CALL_RXH(ieee80211_rx_h_defragment
)
2681 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2682 /* must be after MMIC verify so header is counted in MPDU mic */
2683 #ifdef CONFIG_MAC80211_MESH
2684 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2685 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2687 CALL_RXH(ieee80211_rx_h_amsdu
)
2688 CALL_RXH(ieee80211_rx_h_data
)
2689 CALL_RXH(ieee80211_rx_h_ctrl
);
2690 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2691 CALL_RXH(ieee80211_rx_h_action
)
2692 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2693 CALL_RXH(ieee80211_rx_h_action_return
)
2694 CALL_RXH(ieee80211_rx_h_mgmt
)
2697 ieee80211_rx_handlers_result(rx
, res
);
2698 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2702 rx
->local
->running_rx_handler
= false;
2705 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2708 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2710 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2712 #define CALL_RXH(rxh) \
2715 if (res != RX_CONTINUE) \
2719 CALL_RXH(ieee80211_rx_h_passive_scan
)
2720 CALL_RXH(ieee80211_rx_h_check
)
2722 ieee80211_rx_reorder_ampdu(rx
);
2724 ieee80211_rx_handlers(rx
);
2728 ieee80211_rx_handlers_result(rx
, res
);
2734 * This function makes calls into the RX path, therefore
2735 * it has to be invoked under RCU read lock.
2737 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2739 struct ieee80211_rx_data rx
= {
2741 .sdata
= sta
->sdata
,
2742 .local
= sta
->local
,
2743 /* This is OK -- must be QoS data frame */
2744 .security_idx
= tid
,
2748 struct tid_ampdu_rx
*tid_agg_rx
;
2750 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2754 spin_lock(&tid_agg_rx
->reorder_lock
);
2755 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2756 spin_unlock(&tid_agg_rx
->reorder_lock
);
2758 ieee80211_rx_handlers(&rx
);
2761 /* main receive path */
2763 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2764 struct ieee80211_hdr
*hdr
)
2766 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2767 struct sk_buff
*skb
= rx
->skb
;
2768 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2769 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2770 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2772 switch (sdata
->vif
.type
) {
2773 case NL80211_IFTYPE_STATION
:
2774 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2777 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2778 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2779 sdata
->u
.mgd
.use_4addr
)
2781 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2784 case NL80211_IFTYPE_ADHOC
:
2787 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2790 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2791 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2793 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2794 } else if (!multicast
&&
2795 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2796 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2798 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2799 } else if (!rx
->sta
) {
2801 if (status
->flag
& RX_FLAG_HT
)
2802 rate_idx
= 0; /* TODO: HT rates */
2804 rate_idx
= status
->rate_idx
;
2805 ieee80211_ibss_rx_no_sta(sdata
, bssid
, hdr
->addr2
,
2809 case NL80211_IFTYPE_MESH_POINT
:
2811 !ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
)) {
2812 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2815 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2818 case NL80211_IFTYPE_AP_VLAN
:
2819 case NL80211_IFTYPE_AP
:
2821 if (!ether_addr_equal(sdata
->vif
.addr
, hdr
->addr1
))
2823 } else if (!ieee80211_bssid_match(bssid
,
2826 * Accept public action frames even when the
2827 * BSSID doesn't match, this is used for P2P
2828 * and location updates. Note that mac80211
2829 * itself never looks at these frames.
2831 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2832 ieee80211_is_public_action(hdr
, skb
->len
))
2834 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2835 !ieee80211_is_beacon(hdr
->frame_control
))
2837 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2840 case NL80211_IFTYPE_WDS
:
2841 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2843 if (!ether_addr_equal(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2847 /* should never get here */
2856 * This function returns whether or not the SKB
2857 * was destined for RX processing or not, which,
2858 * if consume is true, is equivalent to whether
2859 * or not the skb was consumed.
2861 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2862 struct sk_buff
*skb
, bool consume
)
2864 struct ieee80211_local
*local
= rx
->local
;
2865 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2866 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2867 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2871 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2872 prepares
= prepare_for_handlers(rx
, hdr
);
2878 skb
= skb_copy(skb
, GFP_ATOMIC
);
2880 if (net_ratelimit())
2881 wiphy_debug(local
->hw
.wiphy
,
2882 "failed to copy skb for %s\n",
2890 ieee80211_invoke_rx_handlers(rx
);
2895 * This is the actual Rx frames handler. as it blongs to Rx path it must
2896 * be called with rcu_read_lock protection.
2898 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2899 struct sk_buff
*skb
)
2901 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2902 struct ieee80211_local
*local
= hw_to_local(hw
);
2903 struct ieee80211_sub_if_data
*sdata
;
2904 struct ieee80211_hdr
*hdr
;
2906 struct ieee80211_rx_data rx
;
2907 struct ieee80211_sub_if_data
*prev
;
2908 struct sta_info
*sta
, *tmp
, *prev_sta
;
2911 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2912 memset(&rx
, 0, sizeof(rx
));
2916 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2917 local
->dot11ReceivedFragmentCount
++;
2919 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2920 test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
) ||
2921 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2922 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2924 if (ieee80211_is_mgmt(fc
))
2925 err
= skb_linearize(skb
);
2927 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2934 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2935 ieee80211_parse_qos(&rx
);
2936 ieee80211_verify_alignment(&rx
);
2938 if (ieee80211_is_data(fc
)) {
2941 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2948 rx
.sdata
= prev_sta
->sdata
;
2949 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2956 rx
.sdata
= prev_sta
->sdata
;
2958 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2966 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2967 if (!ieee80211_sdata_running(sdata
))
2970 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2971 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2975 * frame is destined for this interface, but if it's
2976 * not also for the previous one we handle that after
2977 * the loop to avoid copying the SKB once too much
2985 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2987 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2993 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2996 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
3005 * This is the receive path handler. It is called by a low level driver when an
3006 * 802.11 MPDU is received from the hardware.
3008 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3010 struct ieee80211_local
*local
= hw_to_local(hw
);
3011 struct ieee80211_rate
*rate
= NULL
;
3012 struct ieee80211_supported_band
*sband
;
3013 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
3015 WARN_ON_ONCE(softirq_count() == 0);
3017 if (WARN_ON(status
->band
< 0 ||
3018 status
->band
>= IEEE80211_NUM_BANDS
))
3021 sband
= local
->hw
.wiphy
->bands
[status
->band
];
3022 if (WARN_ON(!sband
))
3026 * If we're suspending, it is possible although not too likely
3027 * that we'd be receiving frames after having already partially
3028 * quiesced the stack. We can't process such frames then since
3029 * that might, for example, cause stations to be added or other
3030 * driver callbacks be invoked.
3032 if (unlikely(local
->quiescing
|| local
->suspended
))
3036 * The same happens when we're not even started,
3037 * but that's worth a warning.
3039 if (WARN_ON(!local
->started
))
3042 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3044 * Validate the rate, unless a PLCP error means that
3045 * we probably can't have a valid rate here anyway.
3048 if (status
->flag
& RX_FLAG_HT
) {
3050 * rate_idx is MCS index, which can be [0-76]
3053 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3055 * Anything else would be some sort of driver or
3056 * hardware error. The driver should catch hardware
3059 if (WARN((status
->rate_idx
< 0 ||
3060 status
->rate_idx
> 76),
3061 "Rate marked as an HT rate but passed "
3062 "status->rate_idx is not "
3063 "an MCS index [0-76]: %d (0x%02x)\n",
3068 if (WARN_ON(status
->rate_idx
< 0 ||
3069 status
->rate_idx
>= sband
->n_bitrates
))
3071 rate
= &sband
->bitrates
[status
->rate_idx
];
3075 status
->rx_flags
= 0;
3078 * key references and virtual interfaces are protected using RCU
3079 * and this requires that we are in a read-side RCU section during
3080 * receive processing
3085 * Frames with failed FCS/PLCP checksum are not returned,
3086 * all other frames are returned without radiotap header
3087 * if it was previously present.
3088 * Also, frames with less than 16 bytes are dropped.
3090 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3096 ieee80211_tpt_led_trig_rx(local
,
3097 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3099 __ieee80211_rx_handle_packet(hw
, skb
);
3107 EXPORT_SYMBOL(ieee80211_rx
);
3109 /* This is a version of the rx handler that can be called from hard irq
3110 * context. Post the skb on the queue and schedule the tasklet */
3111 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3113 struct ieee80211_local
*local
= hw_to_local(hw
);
3115 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3117 skb
->pkt_type
= IEEE80211_RX_MSG
;
3118 skb_queue_tail(&local
->skb_queue
, skb
);
3119 tasklet_schedule(&local
->tasklet
);
3121 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);