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>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
33 * monitor mode reception
35 * This function cleans up the SKB, i.e. it removes all the stuff
36 * only useful for monitoring.
38 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
41 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
42 if (likely(skb
->len
> FCS_LEN
))
43 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
55 static inline int should_drop_frame(struct sk_buff
*skb
,
58 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
59 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
61 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
63 if (unlikely(skb
->len
< 16 + present_fcs_len
))
65 if (ieee80211_is_ctl(hdr
->frame_control
) &&
66 !ieee80211_is_pspoll(hdr
->frame_control
) &&
67 !ieee80211_is_back_req(hdr
->frame_control
))
73 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
74 struct ieee80211_rx_status
*status
)
78 /* always present fields */
79 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
81 if (status
->flag
& RX_FLAG_MACTIME_MPDU
)
83 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
86 if (len
& 1) /* padding for RX_FLAGS if necessary */
89 if (status
->flag
& RX_FLAG_HT
) /* HT info */
96 * ieee80211_add_rx_radiotap_header - add radiotap header
98 * add a radiotap header containing all the fields which the hardware provided.
101 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
103 struct ieee80211_rate
*rate
,
106 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
107 struct ieee80211_radiotap_header
*rthdr
;
111 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
112 memset(rthdr
, 0, rtap_len
);
114 /* radiotap header, set always present flags */
116 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
117 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
118 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
119 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
120 rthdr
->it_len
= cpu_to_le16(rtap_len
);
122 pos
= (unsigned char *)(rthdr
+1);
124 /* the order of the following fields is important */
126 /* IEEE80211_RADIOTAP_TSFT */
127 if (status
->flag
& RX_FLAG_MACTIME_MPDU
) {
128 put_unaligned_le64(status
->mactime
, pos
);
130 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
134 /* IEEE80211_RADIOTAP_FLAGS */
135 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
136 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
137 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
138 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
139 if (status
->flag
& RX_FLAG_SHORTPRE
)
140 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
143 /* IEEE80211_RADIOTAP_RATE */
144 if (status
->flag
& RX_FLAG_HT
) {
146 * MCS information is a separate field in radiotap,
147 * added below. The byte here is needed as padding
148 * for the channel though, so initialise it to 0.
152 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
153 *pos
= rate
->bitrate
/ 5;
157 /* IEEE80211_RADIOTAP_CHANNEL */
158 put_unaligned_le16(status
->freq
, pos
);
160 if (status
->band
== IEEE80211_BAND_5GHZ
)
161 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
163 else if (status
->flag
& RX_FLAG_HT
)
164 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
166 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
167 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
170 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
176 *pos
= status
->signal
;
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
182 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
184 /* IEEE80211_RADIOTAP_ANTENNA */
185 *pos
= status
->antenna
;
188 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
190 /* IEEE80211_RADIOTAP_RX_FLAGS */
191 /* ensure 2 byte alignment for the 2 byte field as required */
192 if ((pos
- (u8
*)rthdr
) & 1)
194 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
195 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
196 put_unaligned_le16(rx_flags
, pos
);
199 if (status
->flag
& RX_FLAG_HT
) {
200 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
201 *pos
++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS
|
202 IEEE80211_RADIOTAP_MCS_HAVE_GI
|
203 IEEE80211_RADIOTAP_MCS_HAVE_BW
;
205 if (status
->flag
& RX_FLAG_SHORT_GI
)
206 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
207 if (status
->flag
& RX_FLAG_40MHZ
)
208 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
210 *pos
++ = status
->rate_idx
;
215 * This function copies a received frame to all monitor interfaces and
216 * returns a cleaned-up SKB that no longer includes the FCS nor the
217 * radiotap header the driver might have added.
219 static struct sk_buff
*
220 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
221 struct ieee80211_rate
*rate
)
223 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
224 struct ieee80211_sub_if_data
*sdata
;
225 int needed_headroom
= 0;
226 struct sk_buff
*skb
, *skb2
;
227 struct net_device
*prev_dev
= NULL
;
228 int present_fcs_len
= 0;
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
239 /* room for the radiotap header based on driver features */
240 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
242 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
243 present_fcs_len
= FCS_LEN
;
245 /* make sure hdr->frame_control is on the linear part */
246 if (!pskb_may_pull(origskb
, 2)) {
247 dev_kfree_skb(origskb
);
251 if (!local
->monitors
) {
252 if (should_drop_frame(origskb
, present_fcs_len
)) {
253 dev_kfree_skb(origskb
);
257 return remove_monitor_info(local
, origskb
);
260 if (should_drop_frame(origskb
, present_fcs_len
)) {
261 /* only need to expand headroom if necessary */
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
272 if (skb_headroom(skb
) < needed_headroom
&&
273 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
282 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
284 origskb
= remove_monitor_info(local
, origskb
);
290 /* prepend radiotap information */
291 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
293 skb_reset_mac_header(skb
);
294 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
295 skb
->pkt_type
= PACKET_OTHERHOST
;
296 skb
->protocol
= htons(ETH_P_802_2
);
298 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
299 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
302 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
305 if (!ieee80211_sdata_running(sdata
))
309 skb2
= skb_clone(skb
, GFP_ATOMIC
);
311 skb2
->dev
= prev_dev
;
312 netif_receive_skb(skb2
);
316 prev_dev
= sdata
->dev
;
317 sdata
->dev
->stats
.rx_packets
++;
318 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
323 netif_receive_skb(skb
);
331 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
333 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
334 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
335 int tid
, seqno_idx
, security_idx
;
337 /* does the frame have a qos control field? */
338 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
339 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
340 /* frame has qos control */
341 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
342 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
343 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
357 * We also use that counter for non-QoS STAs.
359 seqno_idx
= NUM_RX_DATA_QUEUES
;
361 if (ieee80211_is_mgmt(hdr
->frame_control
))
362 security_idx
= NUM_RX_DATA_QUEUES
;
366 rx
->seqno_idx
= seqno_idx
;
367 rx
->security_idx
= security_idx
;
368 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
369 * For now, set skb->priority to 0 for other cases. */
370 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
374 * DOC: Packet alignment
376 * Drivers always need to pass packets that are aligned to two-byte boundaries
379 * Additionally, should, if possible, align the payload data in a way that
380 * guarantees that the contained IP header is aligned to a four-byte
381 * boundary. In the case of regular frames, this simply means aligning the
382 * payload to a four-byte boundary (because either the IP header is directly
383 * contained, or IV/RFC1042 headers that have a length divisible by four are
384 * in front of it). If the payload data is not properly aligned and the
385 * architecture doesn't support efficient unaligned operations, mac80211
386 * will align the data.
388 * With A-MSDU frames, however, the payload data address must yield two modulo
389 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
390 * push the IP header further back to a multiple of four again. Thankfully, the
391 * specs were sane enough this time around to require padding each A-MSDU
392 * subframe to a length that is a multiple of four.
394 * Padding like Atheros hardware adds which is between the 802.11 header and
395 * the payload is not supported, the driver is required to move the 802.11
396 * header to be directly in front of the payload in that case.
398 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
400 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
401 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
402 "unaligned packet at 0x%p\n", rx
->skb
->data
);
409 static ieee80211_rx_result debug_noinline
410 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
412 struct ieee80211_local
*local
= rx
->local
;
413 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
414 struct sk_buff
*skb
= rx
->skb
;
416 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
417 !local
->sched_scanning
))
420 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
421 test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
422 local
->sched_scanning
)
423 return ieee80211_scan_rx(rx
->sdata
, skb
);
425 /* scanning finished during invoking of handlers */
426 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
427 return RX_DROP_UNUSABLE
;
431 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
433 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
435 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
438 return ieee80211_is_robust_mgmt_frame(hdr
);
442 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
444 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
446 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
449 return ieee80211_is_robust_mgmt_frame(hdr
);
453 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
456 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
457 struct ieee80211_mmie
*mmie
;
459 if (skb
->len
< 24 + sizeof(*mmie
) ||
460 !is_multicast_ether_addr(hdr
->da
))
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
464 return -1; /* not a robust management frame */
466 mmie
= (struct ieee80211_mmie
*)
467 (skb
->data
+ skb
->len
- sizeof(*mmie
));
468 if (mmie
->element_id
!= WLAN_EID_MMIE
||
469 mmie
->length
!= sizeof(*mmie
) - 2)
472 return le16_to_cpu(mmie
->key_id
);
476 static ieee80211_rx_result
477 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
479 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
480 char *dev_addr
= rx
->sdata
->vif
.addr
;
482 if (ieee80211_is_data(hdr
->frame_control
)) {
483 if (is_multicast_ether_addr(hdr
->addr1
)) {
484 if (ieee80211_has_tods(hdr
->frame_control
) ||
485 !ieee80211_has_fromds(hdr
->frame_control
))
486 return RX_DROP_MONITOR
;
487 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
488 return RX_DROP_MONITOR
;
490 if (!ieee80211_has_a4(hdr
->frame_control
))
491 return RX_DROP_MONITOR
;
492 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
493 return RX_DROP_MONITOR
;
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
501 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
502 struct ieee80211_mgmt
*mgmt
;
504 if (!ieee80211_is_mgmt(hdr
->frame_control
))
505 return RX_DROP_MONITOR
;
507 if (ieee80211_is_action(hdr
->frame_control
)) {
509 mgmt
= (struct ieee80211_mgmt
*)hdr
;
510 category
= mgmt
->u
.action
.category
;
511 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
512 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
513 return RX_DROP_MONITOR
;
517 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
518 ieee80211_is_probe_resp(hdr
->frame_control
) ||
519 ieee80211_is_beacon(hdr
->frame_control
) ||
520 ieee80211_is_auth(hdr
->frame_control
))
523 return RX_DROP_MONITOR
;
530 #define SEQ_MODULO 0x1000
531 #define SEQ_MASK 0xfff
533 static inline int seq_less(u16 sq1
, u16 sq2
)
535 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
538 static inline u16
seq_inc(u16 sq
)
540 return (sq
+ 1) & SEQ_MASK
;
543 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
545 return (sq1
- sq2
) & SEQ_MASK
;
549 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
550 struct tid_ampdu_rx
*tid_agg_rx
,
553 struct ieee80211_local
*local
= hw_to_local(hw
);
554 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
555 struct ieee80211_rx_status
*status
;
557 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
562 /* release the frame from the reorder ring buffer */
563 tid_agg_rx
->stored_mpdu_num
--;
564 tid_agg_rx
->reorder_buf
[index
] = NULL
;
565 status
= IEEE80211_SKB_RXCB(skb
);
566 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
567 skb_queue_tail(&local
->rx_skb_queue
, skb
);
570 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
573 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
574 struct tid_ampdu_rx
*tid_agg_rx
,
579 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
581 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
582 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
583 tid_agg_rx
->buf_size
;
584 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
589 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
590 * the skb was added to the buffer longer than this time ago, the earlier
591 * frames that have not yet been received are assumed to be lost and the skb
592 * can be released for processing. This may also release other skb's from the
593 * reorder buffer if there are no additional gaps between the frames.
595 * Callers must hold tid_agg_rx->reorder_lock.
597 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
599 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
600 struct tid_ampdu_rx
*tid_agg_rx
)
604 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
606 /* release the buffer until next missing frame */
607 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
608 tid_agg_rx
->buf_size
;
609 if (!tid_agg_rx
->reorder_buf
[index
] &&
610 tid_agg_rx
->stored_mpdu_num
> 1) {
612 * No buffers ready to be released, but check whether any
613 * frames in the reorder buffer have timed out.
616 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
617 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
618 if (!tid_agg_rx
->reorder_buf
[j
]) {
623 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
624 HT_RX_REORDER_BUF_TIMEOUT
))
625 goto set_release_timer
;
627 #ifdef CONFIG_MAC80211_HT_DEBUG
629 wiphy_debug(hw
->wiphy
,
630 "release an RX reorder frame due to timeout on earlier frames\n");
632 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
635 * Increment the head seq# also for the skipped slots.
637 tid_agg_rx
->head_seq_num
=
638 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
641 } else while (tid_agg_rx
->reorder_buf
[index
]) {
642 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
643 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
644 tid_agg_rx
->buf_size
;
647 if (tid_agg_rx
->stored_mpdu_num
) {
648 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
649 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
651 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
652 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
653 if (tid_agg_rx
->reorder_buf
[j
])
659 mod_timer(&tid_agg_rx
->reorder_timer
,
660 tid_agg_rx
->reorder_time
[j
] + 1 +
661 HT_RX_REORDER_BUF_TIMEOUT
);
663 del_timer(&tid_agg_rx
->reorder_timer
);
668 * As this function belongs to the RX path it must be under
669 * rcu_read_lock protection. It returns false if the frame
670 * can be processed immediately, true if it was consumed.
672 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
673 struct tid_ampdu_rx
*tid_agg_rx
,
676 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
677 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
678 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
679 u16 head_seq_num
, buf_size
;
683 spin_lock(&tid_agg_rx
->reorder_lock
);
685 buf_size
= tid_agg_rx
->buf_size
;
686 head_seq_num
= tid_agg_rx
->head_seq_num
;
688 /* frame with out of date sequence number */
689 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
695 * If frame the sequence number exceeds our buffering window
696 * size release some previous frames to make room for this one.
698 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
699 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
700 /* release stored frames up to new head to stack */
701 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
704 /* Now the new frame is always in the range of the reordering buffer */
706 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
708 /* check if we already stored this frame */
709 if (tid_agg_rx
->reorder_buf
[index
]) {
715 * If the current MPDU is in the right order and nothing else
716 * is stored we can process it directly, no need to buffer it.
717 * If it is first but there's something stored, we may be able
718 * to release frames after this one.
720 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
721 tid_agg_rx
->stored_mpdu_num
== 0) {
722 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
727 /* put the frame in the reordering buffer */
728 tid_agg_rx
->reorder_buf
[index
] = skb
;
729 tid_agg_rx
->reorder_time
[index
] = jiffies
;
730 tid_agg_rx
->stored_mpdu_num
++;
731 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
734 spin_unlock(&tid_agg_rx
->reorder_lock
);
739 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
740 * true if the MPDU was buffered, false if it should be processed.
742 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
744 struct sk_buff
*skb
= rx
->skb
;
745 struct ieee80211_local
*local
= rx
->local
;
746 struct ieee80211_hw
*hw
= &local
->hw
;
747 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
748 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
749 struct sta_info
*sta
= rx
->sta
;
750 struct tid_ampdu_rx
*tid_agg_rx
;
754 if (!ieee80211_is_data_qos(hdr
->frame_control
))
758 * filter the QoS data rx stream according to
759 * STA/TID and check if this STA/TID is on aggregation
765 ack_policy
= *ieee80211_get_qos_ctl(hdr
) &
766 IEEE80211_QOS_CTL_ACK_POLICY_MASK
;
767 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
769 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
773 /* qos null data frames are excluded */
774 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
777 /* not part of a BA session */
778 if (ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
&&
779 ack_policy
!= IEEE80211_QOS_CTL_ACK_POLICY_NORMAL
)
782 /* not actually part of this BA session */
783 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
786 /* new, potentially un-ordered, ampdu frame - process it */
788 /* reset session timer */
789 if (tid_agg_rx
->timeout
)
790 mod_timer(&tid_agg_rx
->session_timer
,
791 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
793 /* if this mpdu is fragmented - terminate rx aggregation session */
794 sc
= le16_to_cpu(hdr
->seq_ctrl
);
795 if (sc
& IEEE80211_SCTL_FRAG
) {
796 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
797 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
798 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
803 * No locking needed -- we will only ever process one
804 * RX packet at a time, and thus own tid_agg_rx. All
805 * other code manipulating it needs to (and does) make
806 * sure that we cannot get to it any more before doing
809 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
813 skb_queue_tail(&local
->rx_skb_queue
, skb
);
816 static ieee80211_rx_result debug_noinline
817 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
819 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
820 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
822 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
823 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
824 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
825 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
827 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
828 rx
->local
->dot11FrameDuplicateCount
++;
829 rx
->sta
->num_duplicates
++;
831 return RX_DROP_UNUSABLE
;
833 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
836 if (unlikely(rx
->skb
->len
< 16)) {
837 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
838 return RX_DROP_MONITOR
;
841 /* Drop disallowed frame classes based on STA auth/assoc state;
842 * IEEE 802.11, Chap 5.5.
844 * mac80211 filters only based on association state, i.e. it drops
845 * Class 3 frames from not associated stations. hostapd sends
846 * deauth/disassoc frames when needed. In addition, hostapd is
847 * responsible for filtering on both auth and assoc states.
850 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
851 return ieee80211_rx_mesh_check(rx
);
853 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
854 ieee80211_is_pspoll(hdr
->frame_control
)) &&
855 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
856 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
857 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
858 if (rx
->sta
&& rx
->sta
->dummy
&&
859 ieee80211_is_data_present(hdr
->frame_control
)) {
863 payload
= rx
->skb
->data
+
864 ieee80211_hdrlen(hdr
->frame_control
);
865 ethertype
= (payload
[6] << 8) | payload
[7];
866 if (cpu_to_be16(ethertype
) ==
867 rx
->sdata
->control_port_protocol
)
871 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
872 cfg80211_rx_spurious_frame(rx
->sdata
->dev
,
875 return RX_DROP_UNUSABLE
;
877 return RX_DROP_MONITOR
;
884 static ieee80211_rx_result debug_noinline
885 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
887 struct sk_buff
*skb
= rx
->skb
;
888 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
889 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
892 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
893 struct ieee80211_key
*sta_ptk
= NULL
;
894 int mmie_keyidx
= -1;
900 * There are four types of keys:
902 * - IGTK (group keys for management frames)
903 * - PTK (pairwise keys)
904 * - STK (station-to-station pairwise keys)
906 * When selecting a key, we have to distinguish between multicast
907 * (including broadcast) and unicast frames, the latter can only
908 * use PTKs and STKs while the former always use GTKs and IGTKs.
909 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
910 * unicast frames can also use key indices like GTKs. Hence, if we
911 * don't have a PTK/STK we check the key index for a WEP key.
913 * Note that in a regular BSS, multicast frames are sent by the
914 * AP only, associated stations unicast the frame to the AP first
915 * which then multicasts it on their behalf.
917 * There is also a slight problem in IBSS mode: GTKs are negotiated
918 * with each station, that is something we don't currently handle.
919 * The spec seems to expect that one negotiates the same key with
920 * every station but there's no such requirement; VLANs could be
925 * No point in finding a key and decrypting if the frame is neither
926 * addressed to us nor a multicast frame.
928 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
931 /* start without a key */
935 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
937 fc
= hdr
->frame_control
;
939 if (!ieee80211_has_protected(fc
))
940 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
942 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
944 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
945 (status
->flag
& RX_FLAG_IV_STRIPPED
))
947 /* Skip decryption if the frame is not protected. */
948 if (!ieee80211_has_protected(fc
))
950 } else if (mmie_keyidx
>= 0) {
951 /* Broadcast/multicast robust management frame / BIP */
952 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
953 (status
->flag
& RX_FLAG_IV_STRIPPED
))
956 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
957 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
958 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
960 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
962 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
963 } else if (!ieee80211_has_protected(fc
)) {
965 * The frame was not protected, so skip decryption. However, we
966 * need to set rx->key if there is a key that could have been
967 * used so that the frame may be dropped if encryption would
968 * have been expected.
970 struct ieee80211_key
*key
= NULL
;
971 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
974 if (ieee80211_is_mgmt(fc
) &&
975 is_multicast_ether_addr(hdr
->addr1
) &&
976 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
980 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
981 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
987 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
988 key
= rcu_dereference(sdata
->keys
[i
]);
1000 * The device doesn't give us the IV so we won't be
1001 * able to look up the key. That's ok though, we
1002 * don't need to decrypt the frame, we just won't
1003 * be able to keep statistics accurate.
1004 * Except for key threshold notifications, should
1005 * we somehow allow the driver to tell us which key
1006 * the hardware used if this flag is set?
1008 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
1009 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1012 hdrlen
= ieee80211_hdrlen(fc
);
1014 if (rx
->skb
->len
< 8 + hdrlen
)
1015 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1018 * no need to call ieee80211_wep_get_keyidx,
1019 * it verifies a bunch of things we've done already
1021 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1022 keyidx
= keyid
>> 6;
1024 /* check per-station GTK first, if multicast packet */
1025 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1026 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1028 /* if not found, try default key */
1030 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1033 * RSNA-protected unicast frames should always be
1034 * sent with pairwise or station-to-station keys,
1035 * but for WEP we allow using a key index as well.
1038 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1039 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1040 !is_multicast_ether_addr(hdr
->addr1
))
1046 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1047 return RX_DROP_MONITOR
;
1049 rx
->key
->tx_rx_count
++;
1050 /* TODO: add threshold stuff again */
1052 return RX_DROP_MONITOR
;
1055 if (skb_linearize(rx
->skb
))
1056 return RX_DROP_UNUSABLE
;
1057 /* the hdr variable is invalid now! */
1059 switch (rx
->key
->conf
.cipher
) {
1060 case WLAN_CIPHER_SUITE_WEP40
:
1061 case WLAN_CIPHER_SUITE_WEP104
:
1062 /* Check for weak IVs if possible */
1063 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1064 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1065 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1066 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1067 rx
->sta
->wep_weak_iv_count
++;
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 /* either the frame has been decrypted or will be dropped */
1089 status
->flag
|= RX_FLAG_DECRYPTED
;
1094 static ieee80211_rx_result debug_noinline
1095 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1097 struct ieee80211_local
*local
;
1098 struct ieee80211_hdr
*hdr
;
1099 struct sk_buff
*skb
;
1103 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1105 if (!local
->pspolling
)
1108 if (!ieee80211_has_fromds(hdr
->frame_control
))
1109 /* this is not from AP */
1112 if (!ieee80211_is_data(hdr
->frame_control
))
1115 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1116 /* AP has no more frames buffered for us */
1117 local
->pspolling
= false;
1121 /* more data bit is set, let's request a new frame from the AP */
1122 ieee80211_send_pspoll(local
, rx
->sdata
);
1127 static void ap_sta_ps_start(struct sta_info
*sta
)
1129 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1130 struct ieee80211_local
*local
= sdata
->local
;
1132 atomic_inc(&sdata
->bss
->num_sta_ps
);
1133 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1134 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1135 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1136 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1137 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1138 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1139 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1142 static void ap_sta_ps_end(struct sta_info
*sta
)
1144 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1146 atomic_dec(&sdata
->bss
->num_sta_ps
);
1148 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1149 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1150 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1151 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1153 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1154 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1156 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1157 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1161 ieee80211_sta_ps_deliver_wakeup(sta
);
1164 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1166 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1169 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1171 /* Don't let the same PS state be set twice */
1172 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1173 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1177 ap_sta_ps_start(sta_inf
);
1179 ap_sta_ps_end(sta_inf
);
1183 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1185 static ieee80211_rx_result debug_noinline
1186 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1188 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1189 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1190 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1193 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1196 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1197 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1201 * The device handles station powersave, so don't do anything about
1202 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1203 * it to mac80211 since they're handled.)
1205 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1209 * Don't do anything if the station isn't already asleep. In
1210 * the uAPSD case, the station will probably be marked asleep,
1211 * in the PS-Poll case the station must be confused ...
1213 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1216 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1217 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1218 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1219 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1221 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1224 /* Free PS Poll skb here instead of returning RX_DROP that would
1225 * count as an dropped frame. */
1226 dev_kfree_skb(rx
->skb
);
1229 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1230 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1231 ieee80211_has_pm(hdr
->frame_control
) &&
1232 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1233 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1234 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1235 ac
= ieee802_1d_to_ac
[tid
& 7];
1238 * If this AC is not trigger-enabled do nothing.
1240 * NB: This could/should check a separate bitmap of trigger-
1241 * enabled queues, but for now we only implement uAPSD w/o
1242 * TSPEC changes to the ACs, so they're always the same.
1244 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1247 /* if we are in a service period, do nothing */
1248 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1251 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1252 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1254 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1260 static ieee80211_rx_result debug_noinline
1261 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1263 struct sta_info
*sta
= rx
->sta
;
1264 struct sk_buff
*skb
= rx
->skb
;
1265 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1266 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1272 * Update last_rx only for IBSS packets which are for the current
1273 * BSSID to avoid keeping the current IBSS network alive in cases
1274 * where other STAs start using different BSSID.
1276 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1277 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1278 NL80211_IFTYPE_ADHOC
);
1279 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1280 sta
->last_rx
= jiffies
;
1281 if (ieee80211_is_data(hdr
->frame_control
)) {
1282 sta
->last_rx_rate_idx
= status
->rate_idx
;
1283 sta
->last_rx_rate_flag
= status
->flag
;
1286 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1288 * Mesh beacons will update last_rx when if they are found to
1289 * match the current local configuration when processed.
1291 sta
->last_rx
= jiffies
;
1292 if (ieee80211_is_data(hdr
->frame_control
)) {
1293 sta
->last_rx_rate_idx
= status
->rate_idx
;
1294 sta
->last_rx_rate_flag
= status
->flag
;
1298 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1301 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1302 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1304 sta
->rx_fragments
++;
1305 sta
->rx_bytes
+= rx
->skb
->len
;
1306 sta
->last_signal
= status
->signal
;
1307 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
);
1575 static ieee80211_rx_result debug_noinline
1576 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1578 u8
*data
= rx
->skb
->data
;
1579 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1581 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1584 /* remove the qos control field, update frame type and meta-data */
1585 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1586 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1587 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1588 /* change frame type to non QOS */
1589 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1595 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1597 if (unlikely(!rx
->sta
||
1598 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1605 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1607 struct sk_buff
*skb
= rx
->skb
;
1608 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1611 * Pass through unencrypted frames if the hardware has
1612 * decrypted them already.
1614 if (status
->flag
& RX_FLAG_DECRYPTED
)
1617 /* Drop unencrypted frames if key is set. */
1618 if (unlikely(!ieee80211_has_protected(fc
) &&
1619 !ieee80211_is_nullfunc(fc
) &&
1620 ieee80211_is_data(fc
) &&
1621 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1628 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1630 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1631 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1632 __le16 fc
= hdr
->frame_control
;
1635 * Pass through unencrypted frames if the hardware has
1636 * decrypted them already.
1638 if (status
->flag
& RX_FLAG_DECRYPTED
)
1641 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1642 if (unlikely(!ieee80211_has_protected(fc
) &&
1643 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1645 if (ieee80211_is_deauth(fc
))
1646 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1649 else if (ieee80211_is_disassoc(fc
))
1650 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1655 /* BIP does not use Protected field, so need to check MMIE */
1656 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1657 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1658 if (ieee80211_is_deauth(fc
))
1659 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1662 else if (ieee80211_is_disassoc(fc
))
1663 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1669 * When using MFP, Action frames are not allowed prior to
1670 * having configured keys.
1672 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1673 ieee80211_is_robust_mgmt_frame(
1674 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1682 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1684 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1685 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1686 bool check_port_control
= false;
1687 struct ethhdr
*ehdr
;
1690 *port_control
= false;
1691 if (ieee80211_has_a4(hdr
->frame_control
) &&
1692 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1695 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1696 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1698 if (!sdata
->u
.mgd
.use_4addr
)
1701 check_port_control
= true;
1704 if (is_multicast_ether_addr(hdr
->addr1
) &&
1705 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1708 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1712 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1713 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1714 *port_control
= true;
1715 else if (check_port_control
)
1722 * requires that rx->skb is a frame with ethernet header
1724 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1726 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1727 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1728 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1731 * Allow EAPOL frames to us/the PAE group address regardless
1732 * of whether the frame was encrypted or not.
1734 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1735 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1736 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1739 if (ieee80211_802_1x_port_control(rx
) ||
1740 ieee80211_drop_unencrypted(rx
, fc
))
1747 * requires that rx->skb is a frame with ethernet header
1750 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1752 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1753 struct net_device
*dev
= sdata
->dev
;
1754 struct sk_buff
*skb
, *xmit_skb
;
1755 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1756 struct sta_info
*dsta
;
1757 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1762 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1763 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1764 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1765 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1766 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1767 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1769 * send multicast frames both to higher layers in
1770 * local net stack and back to the wireless medium
1772 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1773 if (!xmit_skb
&& net_ratelimit())
1774 printk(KERN_DEBUG
"%s: failed to clone "
1775 "multicast frame\n", dev
->name
);
1777 dsta
= sta_info_get(sdata
, skb
->data
);
1780 * The destination station is associated to
1781 * this AP (in this VLAN), so send the frame
1782 * directly to it and do not pass it to local
1792 int align __maybe_unused
;
1794 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1796 * 'align' will only take the values 0 or 2 here
1797 * since all frames are required to be aligned
1798 * to 2-byte boundaries when being passed to
1799 * mac80211. That also explains the __skb_push()
1802 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1804 if (WARN_ON(skb_headroom(skb
) < 3)) {
1808 u8
*data
= skb
->data
;
1809 size_t len
= skb_headlen(skb
);
1811 memmove(skb
->data
, data
, len
);
1812 skb_set_tail_pointer(skb
, len
);
1818 /* deliver to local stack */
1819 skb
->protocol
= eth_type_trans(skb
, dev
);
1820 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1821 netif_receive_skb(skb
);
1826 /* send to wireless media */
1827 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1828 skb_reset_network_header(xmit_skb
);
1829 skb_reset_mac_header(xmit_skb
);
1830 dev_queue_xmit(xmit_skb
);
1834 static ieee80211_rx_result debug_noinline
1835 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1837 struct net_device
*dev
= rx
->sdata
->dev
;
1838 struct sk_buff
*skb
= rx
->skb
;
1839 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1840 __le16 fc
= hdr
->frame_control
;
1841 struct sk_buff_head frame_list
;
1842 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1844 if (unlikely(!ieee80211_is_data(fc
)))
1847 if (unlikely(!ieee80211_is_data_present(fc
)))
1848 return RX_DROP_MONITOR
;
1850 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1853 if (ieee80211_has_a4(hdr
->frame_control
) &&
1854 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1855 !rx
->sdata
->u
.vlan
.sta
)
1856 return RX_DROP_UNUSABLE
;
1858 if (is_multicast_ether_addr(hdr
->addr1
) &&
1859 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1860 rx
->sdata
->u
.vlan
.sta
) ||
1861 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1862 rx
->sdata
->u
.mgd
.use_4addr
)))
1863 return RX_DROP_UNUSABLE
;
1866 __skb_queue_head_init(&frame_list
);
1868 if (skb_linearize(skb
))
1869 return RX_DROP_UNUSABLE
;
1871 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1872 rx
->sdata
->vif
.type
,
1873 rx
->local
->hw
.extra_tx_headroom
, true);
1875 while (!skb_queue_empty(&frame_list
)) {
1876 rx
->skb
= __skb_dequeue(&frame_list
);
1878 if (!ieee80211_frame_allowed(rx
, fc
)) {
1879 dev_kfree_skb(rx
->skb
);
1882 dev
->stats
.rx_packets
++;
1883 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1885 ieee80211_deliver_skb(rx
);
1891 #ifdef CONFIG_MAC80211_MESH
1892 static ieee80211_rx_result
1893 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1895 struct ieee80211_hdr
*hdr
;
1896 struct ieee80211s_hdr
*mesh_hdr
;
1897 unsigned int hdrlen
;
1898 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1899 struct ieee80211_local
*local
= rx
->local
;
1900 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1901 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1903 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1904 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1905 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1907 /* frame is in RMC, don't forward */
1908 if (ieee80211_is_data(hdr
->frame_control
) &&
1909 is_multicast_ether_addr(hdr
->addr1
) &&
1910 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1911 return RX_DROP_MONITOR
;
1913 if (!ieee80211_is_data(hdr
->frame_control
))
1918 return RX_DROP_MONITOR
;
1920 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1921 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1922 dropped_frames_congestion
);
1923 return RX_DROP_MONITOR
;
1926 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1927 struct mesh_path
*mppath
;
1931 if (is_multicast_ether_addr(hdr
->addr1
)) {
1932 mpp_addr
= hdr
->addr3
;
1933 proxied_addr
= mesh_hdr
->eaddr1
;
1935 mpp_addr
= hdr
->addr4
;
1936 proxied_addr
= mesh_hdr
->eaddr2
;
1940 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1942 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1944 spin_lock_bh(&mppath
->state_lock
);
1945 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1946 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1947 spin_unlock_bh(&mppath
->state_lock
);
1952 /* Frame has reached destination. Don't forward */
1953 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1954 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1957 skb_set_queue_mapping(skb
, ieee80211_select_queue(sdata
, skb
));
1960 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1962 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1963 dropped_frames_ttl
);
1965 struct ieee80211_hdr
*fwd_hdr
;
1966 struct ieee80211_tx_info
*info
;
1968 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1970 if (!fwd_skb
&& net_ratelimit())
1971 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1976 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1977 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1978 info
= IEEE80211_SKB_CB(fwd_skb
);
1979 memset(info
, 0, sizeof(*info
));
1980 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1981 info
->control
.vif
= &rx
->sdata
->vif
;
1982 info
->control
.jiffies
= jiffies
;
1983 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1984 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1989 * Save TA to addr1 to send TA a path error if a
1990 * suitable next hop is not found
1992 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1994 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1995 /* Failed to immediately resolve next hop:
1996 * fwded frame was dropped or will be added
1997 * later to the pending skb queue. */
1999 return RX_DROP_MONITOR
;
2001 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
2004 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
2006 ieee80211_add_pending_skb(local
, fwd_skb
);
2011 if (is_multicast_ether_addr(hdr
->addr1
) ||
2012 sdata
->dev
->flags
& IFF_PROMISC
)
2015 return RX_DROP_MONITOR
;
2019 static ieee80211_rx_result debug_noinline
2020 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2022 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2023 struct ieee80211_local
*local
= rx
->local
;
2024 struct net_device
*dev
= sdata
->dev
;
2025 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2026 __le16 fc
= hdr
->frame_control
;
2030 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2033 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2034 return RX_DROP_MONITOR
;
2037 * Send unexpected-4addr-frame event to hostapd. For older versions,
2038 * also drop the frame to cooked monitor interfaces.
2040 if (ieee80211_has_a4(hdr
->frame_control
) &&
2041 sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
2043 !test_and_set_sta_flag(rx
->sta
, WLAN_STA_4ADDR_EVENT
))
2044 cfg80211_rx_unexpected_4addr_frame(
2045 rx
->sdata
->dev
, rx
->sta
->sta
.addr
, GFP_ATOMIC
);
2046 return RX_DROP_MONITOR
;
2049 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2051 return RX_DROP_UNUSABLE
;
2053 if (!ieee80211_frame_allowed(rx
, fc
))
2054 return RX_DROP_MONITOR
;
2056 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2057 unlikely(port_control
) && sdata
->bss
) {
2058 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2066 dev
->stats
.rx_packets
++;
2067 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2069 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2070 !is_multicast_ether_addr(
2071 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2072 (!local
->scanning
&&
2073 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2074 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2075 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2078 ieee80211_deliver_skb(rx
);
2083 static ieee80211_rx_result debug_noinline
2084 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2086 struct ieee80211_local
*local
= rx
->local
;
2087 struct ieee80211_hw
*hw
= &local
->hw
;
2088 struct sk_buff
*skb
= rx
->skb
;
2089 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2090 struct tid_ampdu_rx
*tid_agg_rx
;
2094 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2097 if (ieee80211_is_back_req(bar
->frame_control
)) {
2099 __le16 control
, start_seq_num
;
2100 } __packed bar_data
;
2103 return RX_DROP_MONITOR
;
2105 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2106 &bar_data
, sizeof(bar_data
)))
2107 return RX_DROP_MONITOR
;
2109 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2111 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2113 return RX_DROP_MONITOR
;
2115 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2117 /* reset session timer */
2118 if (tid_agg_rx
->timeout
)
2119 mod_timer(&tid_agg_rx
->session_timer
,
2120 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2122 spin_lock(&tid_agg_rx
->reorder_lock
);
2123 /* release stored frames up to start of BAR */
2124 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2125 spin_unlock(&tid_agg_rx
->reorder_lock
);
2132 * After this point, we only want management frames,
2133 * so we can drop all remaining control frames to
2134 * cooked monitor interfaces.
2136 return RX_DROP_MONITOR
;
2139 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2140 struct ieee80211_mgmt
*mgmt
,
2143 struct ieee80211_local
*local
= sdata
->local
;
2144 struct sk_buff
*skb
;
2145 struct ieee80211_mgmt
*resp
;
2147 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2148 /* Not to own unicast address */
2152 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2153 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2154 /* Not from the current AP or not associated yet. */
2158 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2159 /* Too short SA Query request frame */
2163 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2167 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2168 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2169 memset(resp
, 0, 24);
2170 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2171 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2172 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2173 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2174 IEEE80211_STYPE_ACTION
);
2175 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2176 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2177 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2178 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2179 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2180 WLAN_SA_QUERY_TR_ID_LEN
);
2182 ieee80211_tx_skb(sdata
, skb
);
2185 static ieee80211_rx_result debug_noinline
2186 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2188 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2189 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2192 * From here on, look only at management frames.
2193 * Data and control frames are already handled,
2194 * and unknown (reserved) frames are useless.
2196 if (rx
->skb
->len
< 24)
2197 return RX_DROP_MONITOR
;
2199 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2200 return RX_DROP_MONITOR
;
2202 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&&
2203 ieee80211_is_beacon(mgmt
->frame_control
) &&
2204 !(rx
->flags
& IEEE80211_RX_BEACON_REPORTED
)) {
2205 struct ieee80211_rx_status
*status
;
2207 status
= IEEE80211_SKB_RXCB(rx
->skb
);
2208 cfg80211_report_obss_beacon(rx
->local
->hw
.wiphy
,
2209 rx
->skb
->data
, rx
->skb
->len
,
2210 status
->freq
, GFP_ATOMIC
);
2211 rx
->flags
|= IEEE80211_RX_BEACON_REPORTED
;
2214 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2215 return RX_DROP_MONITOR
;
2217 if (ieee80211_drop_unencrypted_mgmt(rx
))
2218 return RX_DROP_UNUSABLE
;
2223 static ieee80211_rx_result debug_noinline
2224 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2226 struct ieee80211_local
*local
= rx
->local
;
2227 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2228 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2229 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2230 int len
= rx
->skb
->len
;
2232 if (!ieee80211_is_action(mgmt
->frame_control
))
2235 /* drop too small frames */
2236 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2237 return RX_DROP_UNUSABLE
;
2239 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2240 return RX_DROP_UNUSABLE
;
2242 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2243 return RX_DROP_UNUSABLE
;
2245 switch (mgmt
->u
.action
.category
) {
2246 case WLAN_CATEGORY_BACK
:
2247 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2248 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
&&
2249 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2250 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2253 /* verify action_code is present */
2254 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2257 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2258 case WLAN_ACTION_ADDBA_REQ
:
2259 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2260 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2263 case WLAN_ACTION_ADDBA_RESP
:
2264 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2265 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2268 case WLAN_ACTION_DELBA
:
2269 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2270 sizeof(mgmt
->u
.action
.u
.delba
)))
2278 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2279 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2282 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2285 /* verify action_code is present */
2286 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2289 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2290 case WLAN_ACTION_SPCT_MSR_REQ
:
2291 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2292 sizeof(mgmt
->u
.action
.u
.measurement
)))
2294 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2296 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2297 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2298 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2301 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2304 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2310 case WLAN_CATEGORY_SA_QUERY
:
2311 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2312 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2315 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2316 case WLAN_ACTION_SA_QUERY_REQUEST
:
2317 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2319 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2323 case WLAN_CATEGORY_SELF_PROTECTED
:
2324 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2325 case WLAN_SP_MESH_PEERING_OPEN
:
2326 case WLAN_SP_MESH_PEERING_CLOSE
:
2327 case WLAN_SP_MESH_PEERING_CONFIRM
:
2328 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2330 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2331 /* userspace handles this frame */
2334 case WLAN_SP_MGK_INFORM
:
2335 case WLAN_SP_MGK_ACK
:
2336 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2341 case WLAN_CATEGORY_MESH_ACTION
:
2342 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2344 if (mesh_action_is_path_sel(mgmt
) &&
2345 (!mesh_path_sel_is_hwmp(sdata
)))
2353 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2354 /* will return in the next handlers */
2359 rx
->sta
->rx_packets
++;
2360 dev_kfree_skb(rx
->skb
);
2364 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2365 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2366 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2368 rx
->sta
->rx_packets
++;
2372 static ieee80211_rx_result debug_noinline
2373 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2375 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2377 /* skip known-bad action frames and return them in the next handler */
2378 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2382 * Getting here means the kernel doesn't know how to handle
2383 * it, but maybe userspace does ... include returned frames
2384 * so userspace can register for those to know whether ones
2385 * it transmitted were processed or returned.
2388 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2389 rx
->skb
->data
, rx
->skb
->len
,
2392 rx
->sta
->rx_packets
++;
2393 dev_kfree_skb(rx
->skb
);
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2404 struct ieee80211_local
*local
= rx
->local
;
2405 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2406 struct sk_buff
*nskb
;
2407 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2408 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2410 if (!ieee80211_is_action(mgmt
->frame_control
))
2414 * For AP mode, hostapd is responsible for handling any action
2415 * frames that we didn't handle, including returning unknown
2416 * ones. For all other modes we will return them to the sender,
2417 * setting the 0x80 bit in the action category, as required by
2418 * 802.11-2007 7.3.1.11.
2419 * Newer versions of hostapd shall also use the management frame
2420 * registration mechanisms, but older ones still use cooked
2421 * monitor interfaces so push all frames there.
2423 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2424 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2425 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2426 return RX_DROP_MONITOR
;
2428 /* do not return rejected action frames */
2429 if (mgmt
->u
.action
.category
& 0x80)
2430 return RX_DROP_UNUSABLE
;
2432 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2435 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2437 nmgmt
->u
.action
.category
|= 0x80;
2438 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2439 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2441 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2443 ieee80211_tx_skb(rx
->sdata
, nskb
);
2445 dev_kfree_skb(rx
->skb
);
2449 static ieee80211_rx_result debug_noinline
2450 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2452 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2453 ieee80211_rx_result rxs
;
2454 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2457 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2458 if (rxs
!= RX_CONTINUE
)
2461 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2463 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2464 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2465 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2466 return RX_DROP_MONITOR
;
2469 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2470 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2471 /* process for all: mesh, mlme, ibss */
2473 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2474 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2475 if (is_multicast_ether_addr(mgmt
->da
) &&
2476 !is_broadcast_ether_addr(mgmt
->da
))
2477 return RX_DROP_MONITOR
;
2479 /* process only for station */
2480 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2481 return RX_DROP_MONITOR
;
2483 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2484 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2485 /* process only for ibss */
2486 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2487 return RX_DROP_MONITOR
;
2490 return RX_DROP_MONITOR
;
2493 /* queue up frame and kick off work to process it */
2494 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2495 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2496 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2498 rx
->sta
->rx_packets
++;
2503 /* TODO: use IEEE80211_RX_FRAGMENTED */
2504 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2505 struct ieee80211_rate
*rate
)
2507 struct ieee80211_sub_if_data
*sdata
;
2508 struct ieee80211_local
*local
= rx
->local
;
2509 struct ieee80211_rtap_hdr
{
2510 struct ieee80211_radiotap_header hdr
;
2516 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2517 struct net_device
*prev_dev
= NULL
;
2518 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2521 * If cooked monitor has been processed already, then
2522 * don't do it again. If not, set the flag.
2524 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2526 rx
->flags
|= IEEE80211_RX_CMNTR
;
2528 /* If there are no cooked monitor interfaces, just free the SKB */
2529 if (!local
->cooked_mntrs
)
2532 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2533 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2536 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2537 memset(rthdr
, 0, sizeof(*rthdr
));
2538 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2539 rthdr
->hdr
.it_present
=
2540 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2541 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2544 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2545 rthdr
->hdr
.it_present
|=
2546 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2548 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2550 if (status
->band
== IEEE80211_BAND_5GHZ
)
2551 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2552 IEEE80211_CHAN_5GHZ
);
2554 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2555 IEEE80211_CHAN_2GHZ
);
2557 skb_set_mac_header(skb
, 0);
2558 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2559 skb
->pkt_type
= PACKET_OTHERHOST
;
2560 skb
->protocol
= htons(ETH_P_802_2
);
2562 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2563 if (!ieee80211_sdata_running(sdata
))
2566 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2567 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2571 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2573 skb2
->dev
= prev_dev
;
2574 netif_receive_skb(skb2
);
2578 prev_dev
= sdata
->dev
;
2579 sdata
->dev
->stats
.rx_packets
++;
2580 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2584 skb
->dev
= prev_dev
;
2585 netif_receive_skb(skb
);
2593 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2594 ieee80211_rx_result res
)
2597 case RX_DROP_MONITOR
:
2598 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2600 rx
->sta
->rx_dropped
++;
2603 struct ieee80211_rate
*rate
= NULL
;
2604 struct ieee80211_supported_band
*sband
;
2605 struct ieee80211_rx_status
*status
;
2607 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2609 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2610 if (!(status
->flag
& RX_FLAG_HT
))
2611 rate
= &sband
->bitrates
[status
->rate_idx
];
2613 ieee80211_rx_cooked_monitor(rx
, rate
);
2616 case RX_DROP_UNUSABLE
:
2617 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2619 rx
->sta
->rx_dropped
++;
2620 dev_kfree_skb(rx
->skb
);
2623 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2628 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2630 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2631 struct sk_buff
*skb
;
2633 #define CALL_RXH(rxh) \
2636 if (res != RX_CONTINUE) \
2640 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2641 if (rx
->local
->running_rx_handler
)
2644 rx
->local
->running_rx_handler
= true;
2646 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2647 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2650 * all the other fields are valid across frames
2651 * that belong to an aMPDU since they are on the
2652 * same TID from the same station
2656 CALL_RXH(ieee80211_rx_h_decrypt
)
2657 CALL_RXH(ieee80211_rx_h_check_more_data
)
2658 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2659 CALL_RXH(ieee80211_rx_h_sta_process
)
2660 CALL_RXH(ieee80211_rx_h_defragment
)
2661 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2662 /* must be after MMIC verify so header is counted in MPDU mic */
2663 #ifdef CONFIG_MAC80211_MESH
2664 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2665 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2667 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2668 CALL_RXH(ieee80211_rx_h_amsdu
)
2669 CALL_RXH(ieee80211_rx_h_data
)
2670 CALL_RXH(ieee80211_rx_h_ctrl
);
2671 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2672 CALL_RXH(ieee80211_rx_h_action
)
2673 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2674 CALL_RXH(ieee80211_rx_h_action_return
)
2675 CALL_RXH(ieee80211_rx_h_mgmt
)
2678 ieee80211_rx_handlers_result(rx
, res
);
2679 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2683 rx
->local
->running_rx_handler
= false;
2686 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2689 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2691 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2693 #define CALL_RXH(rxh) \
2696 if (res != RX_CONTINUE) \
2700 CALL_RXH(ieee80211_rx_h_passive_scan
)
2701 CALL_RXH(ieee80211_rx_h_check
)
2703 ieee80211_rx_reorder_ampdu(rx
);
2705 ieee80211_rx_handlers(rx
);
2709 ieee80211_rx_handlers_result(rx
, res
);
2715 * This function makes calls into the RX path, therefore
2716 * it has to be invoked under RCU read lock.
2718 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2720 struct ieee80211_rx_data rx
= {
2722 .sdata
= sta
->sdata
,
2723 .local
= sta
->local
,
2724 /* This is OK -- must be QoS data frame */
2725 .security_idx
= tid
,
2729 struct tid_ampdu_rx
*tid_agg_rx
;
2731 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2735 spin_lock(&tid_agg_rx
->reorder_lock
);
2736 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2737 spin_unlock(&tid_agg_rx
->reorder_lock
);
2739 ieee80211_rx_handlers(&rx
);
2742 /* main receive path */
2744 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2745 struct ieee80211_hdr
*hdr
)
2747 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2748 struct sk_buff
*skb
= rx
->skb
;
2749 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2750 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2751 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2753 switch (sdata
->vif
.type
) {
2754 case NL80211_IFTYPE_STATION
:
2755 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2758 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2759 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2760 sdata
->u
.mgd
.use_4addr
)
2762 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2765 case NL80211_IFTYPE_ADHOC
:
2768 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2771 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2772 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2774 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2775 } else if (!multicast
&&
2776 compare_ether_addr(sdata
->vif
.addr
,
2778 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2780 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2781 } else if (!rx
->sta
) {
2783 if (status
->flag
& RX_FLAG_HT
)
2784 rate_idx
= 0; /* TODO: HT rates */
2786 rate_idx
= status
->rate_idx
;
2787 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2788 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2791 case NL80211_IFTYPE_MESH_POINT
:
2793 compare_ether_addr(sdata
->vif
.addr
,
2795 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2798 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2801 case NL80211_IFTYPE_AP_VLAN
:
2802 case NL80211_IFTYPE_AP
:
2804 if (compare_ether_addr(sdata
->vif
.addr
,
2807 } else if (!ieee80211_bssid_match(bssid
,
2809 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2810 !ieee80211_is_beacon(hdr
->frame_control
) &&
2811 !(ieee80211_is_action(hdr
->frame_control
) &&
2814 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2817 case NL80211_IFTYPE_WDS
:
2818 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2820 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2824 /* should never get here */
2833 * This function returns whether or not the SKB
2834 * was destined for RX processing or not, which,
2835 * if consume is true, is equivalent to whether
2836 * or not the skb was consumed.
2838 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2839 struct sk_buff
*skb
, bool consume
)
2841 struct ieee80211_local
*local
= rx
->local
;
2842 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2843 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2844 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2848 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2849 prepares
= prepare_for_handlers(rx
, hdr
);
2855 skb
= skb_copy(skb
, GFP_ATOMIC
);
2857 if (net_ratelimit())
2858 wiphy_debug(local
->hw
.wiphy
,
2859 "failed to copy skb for %s\n",
2867 ieee80211_invoke_rx_handlers(rx
);
2872 * This is the actual Rx frames handler. as it blongs to Rx path it must
2873 * be called with rcu_read_lock protection.
2875 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2876 struct sk_buff
*skb
)
2878 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2879 struct ieee80211_local
*local
= hw_to_local(hw
);
2880 struct ieee80211_sub_if_data
*sdata
;
2881 struct ieee80211_hdr
*hdr
;
2883 struct ieee80211_rx_data rx
;
2884 struct ieee80211_sub_if_data
*prev
;
2885 struct sta_info
*sta
, *tmp
, *prev_sta
;
2888 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2889 memset(&rx
, 0, sizeof(rx
));
2893 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2894 local
->dot11ReceivedFragmentCount
++;
2896 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2897 test_bit(SCAN_SW_SCANNING
, &local
->scanning
)))
2898 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2900 if (ieee80211_is_mgmt(fc
))
2901 err
= skb_linearize(skb
);
2903 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2910 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2911 ieee80211_parse_qos(&rx
);
2912 ieee80211_verify_alignment(&rx
);
2914 if (ieee80211_is_data(fc
)) {
2917 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2924 rx
.sdata
= prev_sta
->sdata
;
2925 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2932 rx
.sdata
= prev_sta
->sdata
;
2934 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2942 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2943 if (!ieee80211_sdata_running(sdata
))
2946 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2947 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2951 * frame is destined for this interface, but if it's
2952 * not also for the previous one we handle that after
2953 * the loop to avoid copying the SKB once too much
2961 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2963 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2969 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2972 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2981 * This is the receive path handler. It is called by a low level driver when an
2982 * 802.11 MPDU is received from the hardware.
2984 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2986 struct ieee80211_local
*local
= hw_to_local(hw
);
2987 struct ieee80211_rate
*rate
= NULL
;
2988 struct ieee80211_supported_band
*sband
;
2989 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2991 WARN_ON_ONCE(softirq_count() == 0);
2993 if (WARN_ON(status
->band
< 0 ||
2994 status
->band
>= IEEE80211_NUM_BANDS
))
2997 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2998 if (WARN_ON(!sband
))
3002 * If we're suspending, it is possible although not too likely
3003 * that we'd be receiving frames after having already partially
3004 * quiesced the stack. We can't process such frames then since
3005 * that might, for example, cause stations to be added or other
3006 * driver callbacks be invoked.
3008 if (unlikely(local
->quiescing
|| local
->suspended
))
3012 * The same happens when we're not even started,
3013 * but that's worth a warning.
3015 if (WARN_ON(!local
->started
))
3018 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
3020 * Validate the rate, unless a PLCP error means that
3021 * we probably can't have a valid rate here anyway.
3024 if (status
->flag
& RX_FLAG_HT
) {
3026 * rate_idx is MCS index, which can be [0-76]
3029 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3031 * Anything else would be some sort of driver or
3032 * hardware error. The driver should catch hardware
3035 if (WARN((status
->rate_idx
< 0 ||
3036 status
->rate_idx
> 76),
3037 "Rate marked as an HT rate but passed "
3038 "status->rate_idx is not "
3039 "an MCS index [0-76]: %d (0x%02x)\n",
3044 if (WARN_ON(status
->rate_idx
< 0 ||
3045 status
->rate_idx
>= sband
->n_bitrates
))
3047 rate
= &sband
->bitrates
[status
->rate_idx
];
3051 status
->rx_flags
= 0;
3054 * key references and virtual interfaces are protected using RCU
3055 * and this requires that we are in a read-side RCU section during
3056 * receive processing
3061 * Frames with failed FCS/PLCP checksum are not returned,
3062 * all other frames are returned without radiotap header
3063 * if it was previously present.
3064 * Also, frames with less than 16 bytes are dropped.
3066 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3072 ieee80211_tpt_led_trig_rx(local
,
3073 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3075 __ieee80211_rx_handle_packet(hw
, skb
);
3083 EXPORT_SYMBOL(ieee80211_rx
);
3085 /* This is a version of the rx handler that can be called from hard irq
3086 * context. Post the skb on the queue and schedule the tasklet */
3087 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3089 struct ieee80211_local
*local
= hw_to_local(hw
);
3091 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3093 skb
->pkt_type
= IEEE80211_RX_MSG
;
3094 skb_queue_tail(&local
->skb_queue
, skb
);
3095 tasklet_schedule(&local
->tasklet
);
3097 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);