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 (!rate
|| status
->flag
& RX_FLAG_HT
) {
146 * Without rate information don't add it. If we have,
147 * MCS information is a separate field in radiotap,
148 * added below. The byte here is needed as padding
149 * for the channel though, so initialise it to 0.
153 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
154 *pos
= rate
->bitrate
/ 5;
158 /* IEEE80211_RADIOTAP_CHANNEL */
159 put_unaligned_le16(status
->freq
, pos
);
161 if (status
->band
== IEEE80211_BAND_5GHZ
)
162 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
164 else if (status
->flag
& RX_FLAG_HT
)
165 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
167 else if (rate
&& rate
->flags
& IEEE80211_RATE_ERP_G
)
168 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
171 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
174 put_unaligned_le16(IEEE80211_CHAN_2GHZ
, pos
);
177 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
178 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
179 *pos
= status
->signal
;
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
185 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
187 /* IEEE80211_RADIOTAP_ANTENNA */
188 *pos
= status
->antenna
;
191 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
193 /* IEEE80211_RADIOTAP_RX_FLAGS */
194 /* ensure 2 byte alignment for the 2 byte field as required */
195 if ((pos
- (u8
*)rthdr
) & 1)
197 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
198 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
199 put_unaligned_le16(rx_flags
, pos
);
202 if (status
->flag
& RX_FLAG_HT
) {
203 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS
);
204 *pos
++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS
|
205 IEEE80211_RADIOTAP_MCS_HAVE_GI
|
206 IEEE80211_RADIOTAP_MCS_HAVE_BW
;
208 if (status
->flag
& RX_FLAG_SHORT_GI
)
209 *pos
|= IEEE80211_RADIOTAP_MCS_SGI
;
210 if (status
->flag
& RX_FLAG_40MHZ
)
211 *pos
|= IEEE80211_RADIOTAP_MCS_BW_40
;
213 *pos
++ = status
->rate_idx
;
218 * This function copies a received frame to all monitor interfaces and
219 * returns a cleaned-up SKB that no longer includes the FCS nor the
220 * radiotap header the driver might have added.
222 static struct sk_buff
*
223 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
224 struct ieee80211_rate
*rate
)
226 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
227 struct ieee80211_sub_if_data
*sdata
;
228 int needed_headroom
= 0;
229 struct sk_buff
*skb
, *skb2
;
230 struct net_device
*prev_dev
= NULL
;
231 int present_fcs_len
= 0;
234 * First, we may need to make a copy of the skb because
235 * (1) we need to modify it for radiotap (if not present), and
236 * (2) the other RX handlers will modify the skb we got.
238 * We don't need to, of course, if we aren't going to return
239 * the SKB because it has a bad FCS/PLCP checksum.
242 /* room for the radiotap header based on driver features */
243 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
245 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
246 present_fcs_len
= FCS_LEN
;
248 /* make sure hdr->frame_control is on the linear part */
249 if (!pskb_may_pull(origskb
, 2)) {
250 dev_kfree_skb(origskb
);
254 if (!local
->monitors
) {
255 if (should_drop_frame(origskb
, present_fcs_len
)) {
256 dev_kfree_skb(origskb
);
260 return remove_monitor_info(local
, origskb
);
263 if (should_drop_frame(origskb
, present_fcs_len
)) {
264 /* only need to expand headroom if necessary */
269 * This shouldn't trigger often because most devices have an
270 * RX header they pull before we get here, and that should
271 * be big enough for our radiotap information. We should
272 * probably export the length to drivers so that we can have
273 * them allocate enough headroom to start with.
275 if (skb_headroom(skb
) < needed_headroom
&&
276 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
282 * Need to make a copy and possibly remove radiotap header
283 * and FCS from the original.
285 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
287 origskb
= remove_monitor_info(local
, origskb
);
293 /* prepend radiotap information */
294 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
296 skb_reset_mac_header(skb
);
297 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
298 skb
->pkt_type
= PACKET_OTHERHOST
;
299 skb
->protocol
= htons(ETH_P_802_2
);
301 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
302 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
305 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
308 if (!ieee80211_sdata_running(sdata
))
312 skb2
= skb_clone(skb
, GFP_ATOMIC
);
314 skb2
->dev
= prev_dev
;
315 netif_receive_skb(skb2
);
319 prev_dev
= sdata
->dev
;
320 sdata
->dev
->stats
.rx_packets
++;
321 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
326 netif_receive_skb(skb
);
334 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
336 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
337 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
338 int tid
, seqno_idx
, security_idx
;
340 /* does the frame have a qos control field? */
341 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
342 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
343 /* frame has qos control */
344 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
345 if (*qc
& IEEE80211_QOS_CTL_A_MSDU_PRESENT
)
346 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
352 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
354 * Sequence numbers for management frames, QoS data
355 * frames with a broadcast/multicast address in the
356 * Address 1 field, and all non-QoS data frames sent
357 * by QoS STAs are assigned using an additional single
358 * modulo-4096 counter, [...]
360 * We also use that counter for non-QoS STAs.
362 seqno_idx
= NUM_RX_DATA_QUEUES
;
364 if (ieee80211_is_mgmt(hdr
->frame_control
))
365 security_idx
= NUM_RX_DATA_QUEUES
;
369 rx
->seqno_idx
= seqno_idx
;
370 rx
->security_idx
= security_idx
;
371 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
372 * For now, set skb->priority to 0 for other cases. */
373 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
377 * DOC: Packet alignment
379 * Drivers always need to pass packets that are aligned to two-byte boundaries
382 * Additionally, should, if possible, align the payload data in a way that
383 * guarantees that the contained IP header is aligned to a four-byte
384 * boundary. In the case of regular frames, this simply means aligning the
385 * payload to a four-byte boundary (because either the IP header is directly
386 * contained, or IV/RFC1042 headers that have a length divisible by four are
387 * in front of it). If the payload data is not properly aligned and the
388 * architecture doesn't support efficient unaligned operations, mac80211
389 * will align the data.
391 * With A-MSDU frames, however, the payload data address must yield two modulo
392 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
393 * push the IP header further back to a multiple of four again. Thankfully, the
394 * specs were sane enough this time around to require padding each A-MSDU
395 * subframe to a length that is a multiple of four.
397 * Padding like Atheros hardware adds which is between the 802.11 header and
398 * the payload is not supported, the driver is required to move the 802.11
399 * header to be directly in front of the payload in that case.
401 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
403 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
405 "unaligned packet at 0x%p\n", rx
->skb
->data
);
412 static ieee80211_rx_result debug_noinline
413 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
415 struct ieee80211_local
*local
= rx
->local
;
416 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
417 struct sk_buff
*skb
= rx
->skb
;
419 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
420 !local
->sched_scanning
))
423 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
424 local
->sched_scanning
)
425 return ieee80211_scan_rx(rx
->sdata
, skb
);
427 if (test_bit(SCAN_SW_SCANNING
, &local
->scanning
)) {
428 /* drop all the other packets during a software scan anyway */
429 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
434 /* scanning finished during invoking of handlers */
435 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
436 return RX_DROP_UNUSABLE
;
440 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
442 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
444 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
447 return ieee80211_is_robust_mgmt_frame(hdr
);
451 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
453 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
455 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
458 return ieee80211_is_robust_mgmt_frame(hdr
);
462 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
463 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
465 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
466 struct ieee80211_mmie
*mmie
;
468 if (skb
->len
< 24 + sizeof(*mmie
) ||
469 !is_multicast_ether_addr(hdr
->da
))
472 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
473 return -1; /* not a robust management frame */
475 mmie
= (struct ieee80211_mmie
*)
476 (skb
->data
+ skb
->len
- sizeof(*mmie
));
477 if (mmie
->element_id
!= WLAN_EID_MMIE
||
478 mmie
->length
!= sizeof(*mmie
) - 2)
481 return le16_to_cpu(mmie
->key_id
);
485 static ieee80211_rx_result
486 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
488 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
489 char *dev_addr
= rx
->sdata
->vif
.addr
;
491 if (ieee80211_is_data(hdr
->frame_control
)) {
492 if (is_multicast_ether_addr(hdr
->addr1
)) {
493 if (ieee80211_has_tods(hdr
->frame_control
) ||
494 !ieee80211_has_fromds(hdr
->frame_control
))
495 return RX_DROP_MONITOR
;
496 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
497 return RX_DROP_MONITOR
;
499 if (!ieee80211_has_a4(hdr
->frame_control
))
500 return RX_DROP_MONITOR
;
501 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
502 return RX_DROP_MONITOR
;
506 /* If there is not an established peer link and this is not a peer link
507 * establisment frame, beacon or probe, drop the frame.
510 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != NL80211_PLINK_ESTAB
) {
511 struct ieee80211_mgmt
*mgmt
;
513 if (!ieee80211_is_mgmt(hdr
->frame_control
))
514 return RX_DROP_MONITOR
;
516 if (ieee80211_is_action(hdr
->frame_control
)) {
518 mgmt
= (struct ieee80211_mgmt
*)hdr
;
519 category
= mgmt
->u
.action
.category
;
520 if (category
!= WLAN_CATEGORY_MESH_ACTION
&&
521 category
!= WLAN_CATEGORY_SELF_PROTECTED
)
522 return RX_DROP_MONITOR
;
526 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
527 ieee80211_is_probe_resp(hdr
->frame_control
) ||
528 ieee80211_is_beacon(hdr
->frame_control
) ||
529 ieee80211_is_auth(hdr
->frame_control
))
532 return RX_DROP_MONITOR
;
539 #define SEQ_MODULO 0x1000
540 #define SEQ_MASK 0xfff
542 static inline int seq_less(u16 sq1
, u16 sq2
)
544 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
547 static inline u16
seq_inc(u16 sq
)
549 return (sq
+ 1) & SEQ_MASK
;
552 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
554 return (sq1
- sq2
) & SEQ_MASK
;
558 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
559 struct tid_ampdu_rx
*tid_agg_rx
,
562 struct ieee80211_local
*local
= hw_to_local(hw
);
563 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
564 struct ieee80211_rx_status
*status
;
566 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
571 /* release the frame from the reorder ring buffer */
572 tid_agg_rx
->stored_mpdu_num
--;
573 tid_agg_rx
->reorder_buf
[index
] = NULL
;
574 status
= IEEE80211_SKB_RXCB(skb
);
575 status
->rx_flags
|= IEEE80211_RX_DEFERRED_RELEASE
;
576 skb_queue_tail(&local
->rx_skb_queue
, skb
);
579 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
582 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
583 struct tid_ampdu_rx
*tid_agg_rx
,
588 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
590 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
591 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
592 tid_agg_rx
->buf_size
;
593 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
598 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
599 * the skb was added to the buffer longer than this time ago, the earlier
600 * frames that have not yet been received are assumed to be lost and the skb
601 * can be released for processing. This may also release other skb's from the
602 * reorder buffer if there are no additional gaps between the frames.
604 * Callers must hold tid_agg_rx->reorder_lock.
606 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
608 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
609 struct tid_ampdu_rx
*tid_agg_rx
)
613 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
615 /* release the buffer until next missing frame */
616 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
617 tid_agg_rx
->buf_size
;
618 if (!tid_agg_rx
->reorder_buf
[index
] &&
619 tid_agg_rx
->stored_mpdu_num
> 1) {
621 * No buffers ready to be released, but check whether any
622 * frames in the reorder buffer have timed out.
625 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
626 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
627 if (!tid_agg_rx
->reorder_buf
[j
]) {
632 !time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
633 HT_RX_REORDER_BUF_TIMEOUT
))
634 goto set_release_timer
;
636 #ifdef CONFIG_MAC80211_HT_DEBUG
638 wiphy_debug(hw
->wiphy
,
639 "release an RX reorder frame due to timeout on earlier frames\n");
641 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
644 * Increment the head seq# also for the skipped slots.
646 tid_agg_rx
->head_seq_num
=
647 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
650 } else while (tid_agg_rx
->reorder_buf
[index
]) {
651 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
652 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
653 tid_agg_rx
->buf_size
;
656 if (tid_agg_rx
->stored_mpdu_num
) {
657 j
= index
= seq_sub(tid_agg_rx
->head_seq_num
,
658 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
660 for (; j
!= (index
- 1) % tid_agg_rx
->buf_size
;
661 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
662 if (tid_agg_rx
->reorder_buf
[j
])
668 mod_timer(&tid_agg_rx
->reorder_timer
,
669 tid_agg_rx
->reorder_time
[j
] + 1 +
670 HT_RX_REORDER_BUF_TIMEOUT
);
672 del_timer(&tid_agg_rx
->reorder_timer
);
677 * As this function belongs to the RX path it must be under
678 * rcu_read_lock protection. It returns false if the frame
679 * can be processed immediately, true if it was consumed.
681 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
682 struct tid_ampdu_rx
*tid_agg_rx
,
685 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
686 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
687 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
688 u16 head_seq_num
, buf_size
;
692 spin_lock(&tid_agg_rx
->reorder_lock
);
694 buf_size
= tid_agg_rx
->buf_size
;
695 head_seq_num
= tid_agg_rx
->head_seq_num
;
697 /* frame with out of date sequence number */
698 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
704 * If frame the sequence number exceeds our buffering window
705 * size release some previous frames to make room for this one.
707 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
708 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
709 /* release stored frames up to new head to stack */
710 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
);
713 /* Now the new frame is always in the range of the reordering buffer */
715 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
717 /* check if we already stored this frame */
718 if (tid_agg_rx
->reorder_buf
[index
]) {
724 * If the current MPDU is in the right order and nothing else
725 * is stored we can process it directly, no need to buffer it.
726 * If it is first but there's something stored, we may be able
727 * to release frames after this one.
729 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
730 tid_agg_rx
->stored_mpdu_num
== 0) {
731 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
736 /* put the frame in the reordering buffer */
737 tid_agg_rx
->reorder_buf
[index
] = skb
;
738 tid_agg_rx
->reorder_time
[index
] = jiffies
;
739 tid_agg_rx
->stored_mpdu_num
++;
740 ieee80211_sta_reorder_release(hw
, tid_agg_rx
);
743 spin_unlock(&tid_agg_rx
->reorder_lock
);
748 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
749 * true if the MPDU was buffered, false if it should be processed.
751 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
)
753 struct sk_buff
*skb
= rx
->skb
;
754 struct ieee80211_local
*local
= rx
->local
;
755 struct ieee80211_hw
*hw
= &local
->hw
;
756 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
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 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
775 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
779 /* qos null data frames are excluded */
780 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
783 /* new, potentially un-ordered, ampdu frame - process it */
785 /* reset session timer */
786 if (tid_agg_rx
->timeout
)
787 mod_timer(&tid_agg_rx
->session_timer
,
788 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
790 /* if this mpdu is fragmented - terminate rx aggregation session */
791 sc
= le16_to_cpu(hdr
->seq_ctrl
);
792 if (sc
& IEEE80211_SCTL_FRAG
) {
793 skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
794 skb_queue_tail(&rx
->sdata
->skb_queue
, skb
);
795 ieee80211_queue_work(&local
->hw
, &rx
->sdata
->work
);
800 * No locking needed -- we will only ever process one
801 * RX packet at a time, and thus own tid_agg_rx. All
802 * other code manipulating it needs to (and does) make
803 * sure that we cannot get to it any more before doing
806 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
))
810 skb_queue_tail(&local
->rx_skb_queue
, skb
);
813 static ieee80211_rx_result debug_noinline
814 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
816 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
817 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
819 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
820 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
821 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
822 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] ==
824 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
825 rx
->local
->dot11FrameDuplicateCount
++;
826 rx
->sta
->num_duplicates
++;
828 return RX_DROP_UNUSABLE
;
830 rx
->sta
->last_seq_ctrl
[rx
->seqno_idx
] = hdr
->seq_ctrl
;
833 if (unlikely(rx
->skb
->len
< 16)) {
834 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
835 return RX_DROP_MONITOR
;
838 /* Drop disallowed frame classes based on STA auth/assoc state;
839 * IEEE 802.11, Chap 5.5.
841 * mac80211 filters only based on association state, i.e. it drops
842 * Class 3 frames from not associated stations. hostapd sends
843 * deauth/disassoc frames when needed. In addition, hostapd is
844 * responsible for filtering on both auth and assoc states.
847 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
848 return ieee80211_rx_mesh_check(rx
);
850 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
851 ieee80211_is_pspoll(hdr
->frame_control
)) &&
852 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
853 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
854 (!rx
->sta
|| !test_sta_flag(rx
->sta
, WLAN_STA_ASSOC
)))) {
855 if (rx
->sta
&& rx
->sta
->dummy
&&
856 ieee80211_is_data_present(hdr
->frame_control
)) {
860 payload
= rx
->skb
->data
+
861 ieee80211_hdrlen(hdr
->frame_control
);
862 ethertype
= (payload
[6] << 8) | payload
[7];
863 if (cpu_to_be16(ethertype
) ==
864 rx
->sdata
->control_port_protocol
)
867 return RX_DROP_MONITOR
;
874 static ieee80211_rx_result debug_noinline
875 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
877 struct sk_buff
*skb
= rx
->skb
;
878 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
879 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
882 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
883 struct ieee80211_key
*sta_ptk
= NULL
;
884 int mmie_keyidx
= -1;
890 * There are four types of keys:
892 * - IGTK (group keys for management frames)
893 * - PTK (pairwise keys)
894 * - STK (station-to-station pairwise keys)
896 * When selecting a key, we have to distinguish between multicast
897 * (including broadcast) and unicast frames, the latter can only
898 * use PTKs and STKs while the former always use GTKs and IGTKs.
899 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
900 * unicast frames can also use key indices like GTKs. Hence, if we
901 * don't have a PTK/STK we check the key index for a WEP key.
903 * Note that in a regular BSS, multicast frames are sent by the
904 * AP only, associated stations unicast the frame to the AP first
905 * which then multicasts it on their behalf.
907 * There is also a slight problem in IBSS mode: GTKs are negotiated
908 * with each station, that is something we don't currently handle.
909 * The spec seems to expect that one negotiates the same key with
910 * every station but there's no such requirement; VLANs could be
915 * No point in finding a key and decrypting if the frame is neither
916 * addressed to us nor a multicast frame.
918 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
921 /* start without a key */
925 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
927 fc
= hdr
->frame_control
;
929 if (!ieee80211_has_protected(fc
))
930 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
932 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
934 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
935 (status
->flag
& RX_FLAG_IV_STRIPPED
))
937 /* Skip decryption if the frame is not protected. */
938 if (!ieee80211_has_protected(fc
))
940 } else if (mmie_keyidx
>= 0) {
941 /* Broadcast/multicast robust management frame / BIP */
942 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
943 (status
->flag
& RX_FLAG_IV_STRIPPED
))
946 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
947 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
948 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
950 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
952 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
953 } else if (!ieee80211_has_protected(fc
)) {
955 * The frame was not protected, so skip decryption. However, we
956 * need to set rx->key if there is a key that could have been
957 * used so that the frame may be dropped if encryption would
958 * have been expected.
960 struct ieee80211_key
*key
= NULL
;
961 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
964 if (ieee80211_is_mgmt(fc
) &&
965 is_multicast_ether_addr(hdr
->addr1
) &&
966 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
970 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
971 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
977 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
978 key
= rcu_dereference(sdata
->keys
[i
]);
990 * The device doesn't give us the IV so we won't be
991 * able to look up the key. That's ok though, we
992 * don't need to decrypt the frame, we just won't
993 * be able to keep statistics accurate.
994 * Except for key threshold notifications, should
995 * we somehow allow the driver to tell us which key
996 * the hardware used if this flag is set?
998 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
999 (status
->flag
& RX_FLAG_IV_STRIPPED
))
1002 hdrlen
= ieee80211_hdrlen(fc
);
1004 if (rx
->skb
->len
< 8 + hdrlen
)
1005 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1008 * no need to call ieee80211_wep_get_keyidx,
1009 * it verifies a bunch of things we've done already
1011 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1012 keyidx
= keyid
>> 6;
1014 /* check per-station GTK first, if multicast packet */
1015 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1016 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1018 /* if not found, try default key */
1020 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1023 * RSNA-protected unicast frames should always be
1024 * sent with pairwise or station-to-station keys,
1025 * but for WEP we allow using a key index as well.
1028 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1029 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1030 !is_multicast_ether_addr(hdr
->addr1
))
1036 if (unlikely(rx
->key
->flags
& KEY_FLAG_TAINTED
))
1037 return RX_DROP_MONITOR
;
1039 rx
->key
->tx_rx_count
++;
1040 /* TODO: add threshold stuff again */
1042 return RX_DROP_MONITOR
;
1045 if (skb_linearize(rx
->skb
))
1046 return RX_DROP_UNUSABLE
;
1047 /* the hdr variable is invalid now! */
1049 switch (rx
->key
->conf
.cipher
) {
1050 case WLAN_CIPHER_SUITE_WEP40
:
1051 case WLAN_CIPHER_SUITE_WEP104
:
1052 /* Check for weak IVs if possible */
1053 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1054 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1055 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1056 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1057 rx
->sta
->wep_weak_iv_count
++;
1059 result
= ieee80211_crypto_wep_decrypt(rx
);
1061 case WLAN_CIPHER_SUITE_TKIP
:
1062 result
= ieee80211_crypto_tkip_decrypt(rx
);
1064 case WLAN_CIPHER_SUITE_CCMP
:
1065 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1067 case WLAN_CIPHER_SUITE_AES_CMAC
:
1068 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1072 * We can reach here only with HW-only algorithms
1073 * but why didn't it decrypt the frame?!
1075 return RX_DROP_UNUSABLE
;
1078 /* either the frame has been decrypted or will be dropped */
1079 status
->flag
|= RX_FLAG_DECRYPTED
;
1084 static ieee80211_rx_result debug_noinline
1085 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1087 struct ieee80211_local
*local
;
1088 struct ieee80211_hdr
*hdr
;
1089 struct sk_buff
*skb
;
1093 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1095 if (!local
->pspolling
)
1098 if (!ieee80211_has_fromds(hdr
->frame_control
))
1099 /* this is not from AP */
1102 if (!ieee80211_is_data(hdr
->frame_control
))
1105 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1106 /* AP has no more frames buffered for us */
1107 local
->pspolling
= false;
1111 /* more data bit is set, let's request a new frame from the AP */
1112 ieee80211_send_pspoll(local
, rx
->sdata
);
1117 static void ap_sta_ps_start(struct sta_info
*sta
)
1119 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1120 struct ieee80211_local
*local
= sdata
->local
;
1122 atomic_inc(&sdata
->bss
->num_sta_ps
);
1123 set_sta_flag(sta
, WLAN_STA_PS_STA
);
1124 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1125 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1126 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1127 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1128 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1129 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132 static void ap_sta_ps_end(struct sta_info
*sta
)
1134 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1136 atomic_dec(&sdata
->bss
->num_sta_ps
);
1138 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1139 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1140 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1141 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143 if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
1144 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1145 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1146 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1147 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1151 ieee80211_sta_ps_deliver_wakeup(sta
);
1154 int ieee80211_sta_ps_transition(struct ieee80211_sta
*sta
, bool start
)
1156 struct sta_info
*sta_inf
= container_of(sta
, struct sta_info
, sta
);
1159 WARN_ON(!(sta_inf
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
));
1161 /* Don't let the same PS state be set twice */
1162 in_ps
= test_sta_flag(sta_inf
, WLAN_STA_PS_STA
);
1163 if ((start
&& in_ps
) || (!start
&& !in_ps
))
1167 ap_sta_ps_start(sta_inf
);
1169 ap_sta_ps_end(sta_inf
);
1173 EXPORT_SYMBOL(ieee80211_sta_ps_transition
);
1175 static ieee80211_rx_result debug_noinline
1176 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data
*rx
)
1178 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1179 struct ieee80211_hdr
*hdr
= (void *)rx
->skb
->data
;
1180 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1183 if (!rx
->sta
|| !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1186 if (sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1187 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
)
1191 * The device handles station powersave, so don't do anything about
1192 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1193 * it to mac80211 since they're handled.)
1195 if (sdata
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
1199 * Don't do anything if the station isn't already asleep. In
1200 * the uAPSD case, the station will probably be marked asleep,
1201 * in the PS-Poll case the station must be confused ...
1203 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_STA
))
1206 if (unlikely(ieee80211_is_pspoll(hdr
->frame_control
))) {
1207 if (!test_sta_flag(rx
->sta
, WLAN_STA_SP
)) {
1208 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1209 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1211 set_sta_flag(rx
->sta
, WLAN_STA_PSPOLL
);
1214 /* Free PS Poll skb here instead of returning RX_DROP that would
1215 * count as an dropped frame. */
1216 dev_kfree_skb(rx
->skb
);
1219 } else if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1220 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1221 ieee80211_has_pm(hdr
->frame_control
) &&
1222 (ieee80211_is_data_qos(hdr
->frame_control
) ||
1223 ieee80211_is_qos_nullfunc(hdr
->frame_control
))) {
1224 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
1225 ac
= ieee802_1d_to_ac
[tid
& 7];
1228 * If this AC is not trigger-enabled do nothing.
1230 * NB: This could/should check a separate bitmap of trigger-
1231 * enabled queues, but for now we only implement uAPSD w/o
1232 * TSPEC changes to the ACs, so they're always the same.
1234 if (!(rx
->sta
->sta
.uapsd_queues
& BIT(ac
)))
1237 /* if we are in a service period, do nothing */
1238 if (test_sta_flag(rx
->sta
, WLAN_STA_SP
))
1241 if (!test_sta_flag(rx
->sta
, WLAN_STA_PS_DRIVER
))
1242 ieee80211_sta_ps_deliver_uapsd(rx
->sta
);
1244 set_sta_flag(rx
->sta
, WLAN_STA_UAPSD
);
1250 static ieee80211_rx_result debug_noinline
1251 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1253 struct sta_info
*sta
= rx
->sta
;
1254 struct sk_buff
*skb
= rx
->skb
;
1255 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1256 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1262 * Update last_rx only for IBSS packets which are for the current
1263 * BSSID to avoid keeping the current IBSS network alive in cases
1264 * where other STAs start using different BSSID.
1266 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1267 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1268 NL80211_IFTYPE_ADHOC
);
1269 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0) {
1270 sta
->last_rx
= jiffies
;
1271 if (ieee80211_is_data(hdr
->frame_control
)) {
1272 sta
->last_rx_rate_idx
= status
->rate_idx
;
1273 sta
->last_rx_rate_flag
= status
->flag
;
1276 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1278 * Mesh beacons will update last_rx when if they are found to
1279 * match the current local configuration when processed.
1281 sta
->last_rx
= jiffies
;
1282 if (ieee80211_is_data(hdr
->frame_control
)) {
1283 sta
->last_rx_rate_idx
= status
->rate_idx
;
1284 sta
->last_rx_rate_flag
= status
->flag
;
1288 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1291 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1292 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1294 sta
->rx_fragments
++;
1295 sta
->rx_bytes
+= rx
->skb
->len
;
1296 sta
->last_signal
= status
->signal
;
1297 ewma_add(&sta
->avg_signal
, -status
->signal
);
1300 * Change STA power saving mode only at the end of a frame
1301 * exchange sequence.
1303 if (!(sta
->local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
) &&
1304 !ieee80211_has_morefrags(hdr
->frame_control
) &&
1305 !(status
->rx_flags
& IEEE80211_RX_DEFERRED_RELEASE
) &&
1306 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1307 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1308 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
1310 * Ignore doze->wake transitions that are
1311 * indicated by non-data frames, the standard
1312 * is unclear here, but for example going to
1313 * PS mode and then scanning would cause a
1314 * doze->wake transition for the probe request,
1315 * and that is clearly undesirable.
1317 if (ieee80211_is_data(hdr
->frame_control
) &&
1318 !ieee80211_has_pm(hdr
->frame_control
))
1321 if (ieee80211_has_pm(hdr
->frame_control
))
1322 ap_sta_ps_start(sta
);
1327 * Drop (qos-)data::nullfunc frames silently, since they
1328 * are used only to control station power saving mode.
1330 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1331 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1332 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1335 * If we receive a 4-addr nullfunc frame from a STA
1336 * that was not moved to a 4-addr STA vlan yet, drop
1337 * the frame to the monitor interface, to make sure
1338 * that hostapd sees it
1340 if (ieee80211_has_a4(hdr
->frame_control
) &&
1341 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1342 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1343 !rx
->sdata
->u
.vlan
.sta
)))
1344 return RX_DROP_MONITOR
;
1346 * Update counter and free packet here to avoid
1347 * counting this as a dropped packed.
1350 dev_kfree_skb(rx
->skb
);
1355 } /* ieee80211_rx_h_sta_process */
1357 static inline struct ieee80211_fragment_entry
*
1358 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1359 unsigned int frag
, unsigned int seq
, int rx_queue
,
1360 struct sk_buff
**skb
)
1362 struct ieee80211_fragment_entry
*entry
;
1365 idx
= sdata
->fragment_next
;
1366 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1367 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1368 sdata
->fragment_next
= 0;
1370 if (!skb_queue_empty(&entry
->skb_list
)) {
1371 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1372 struct ieee80211_hdr
*hdr
=
1373 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1374 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1375 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1376 "addr1=%pM addr2=%pM\n",
1378 jiffies
- entry
->first_frag_time
, entry
->seq
,
1379 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1381 __skb_queue_purge(&entry
->skb_list
);
1384 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1386 entry
->first_frag_time
= jiffies
;
1388 entry
->rx_queue
= rx_queue
;
1389 entry
->last_frag
= frag
;
1391 entry
->extra_len
= 0;
1396 static inline struct ieee80211_fragment_entry
*
1397 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1398 unsigned int frag
, unsigned int seq
,
1399 int rx_queue
, struct ieee80211_hdr
*hdr
)
1401 struct ieee80211_fragment_entry
*entry
;
1404 idx
= sdata
->fragment_next
;
1405 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1406 struct ieee80211_hdr
*f_hdr
;
1410 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1412 entry
= &sdata
->fragments
[idx
];
1413 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1414 entry
->rx_queue
!= rx_queue
||
1415 entry
->last_frag
+ 1 != frag
)
1418 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1421 * Check ftype and addresses are equal, else check next fragment
1423 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1424 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1425 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1426 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1429 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1430 __skb_queue_purge(&entry
->skb_list
);
1439 static ieee80211_rx_result debug_noinline
1440 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1442 struct ieee80211_hdr
*hdr
;
1445 unsigned int frag
, seq
;
1446 struct ieee80211_fragment_entry
*entry
;
1447 struct sk_buff
*skb
;
1448 struct ieee80211_rx_status
*status
;
1450 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1451 fc
= hdr
->frame_control
;
1452 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1453 frag
= sc
& IEEE80211_SCTL_FRAG
;
1455 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1456 (rx
->skb
)->len
< 24 ||
1457 is_multicast_ether_addr(hdr
->addr1
))) {
1458 /* not fragmented */
1461 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1463 if (skb_linearize(rx
->skb
))
1464 return RX_DROP_UNUSABLE
;
1467 * skb_linearize() might change the skb->data and
1468 * previously cached variables (in this case, hdr) need to
1469 * be refreshed with the new data.
1471 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1472 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1475 /* This is the first fragment of a new frame. */
1476 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1477 rx
->seqno_idx
, &(rx
->skb
));
1478 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1479 ieee80211_has_protected(fc
)) {
1480 int queue
= rx
->security_idx
;
1481 /* Store CCMP PN so that we can verify that the next
1482 * fragment has a sequential PN value. */
1484 memcpy(entry
->last_pn
,
1485 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1491 /* This is a fragment for a frame that should already be pending in
1492 * fragment cache. Add this fragment to the end of the pending entry.
1494 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
,
1495 rx
->seqno_idx
, hdr
);
1497 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1498 return RX_DROP_MONITOR
;
1501 /* Verify that MPDUs within one MSDU have sequential PN values.
1502 * (IEEE 802.11i, 8.3.3.4.5) */
1505 u8 pn
[CCMP_PN_LEN
], *rpn
;
1507 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1508 return RX_DROP_UNUSABLE
;
1509 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1510 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1515 queue
= rx
->security_idx
;
1516 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1517 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1518 return RX_DROP_UNUSABLE
;
1519 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1522 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1523 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1524 entry
->last_frag
= frag
;
1525 entry
->extra_len
+= rx
->skb
->len
;
1526 if (ieee80211_has_morefrags(fc
)) {
1531 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1532 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1533 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1534 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1536 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1537 __skb_queue_purge(&entry
->skb_list
);
1538 return RX_DROP_UNUSABLE
;
1541 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1542 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1546 /* Complete frame has been reassembled - process it now */
1547 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1548 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1552 rx
->sta
->rx_packets
++;
1553 if (is_multicast_ether_addr(hdr
->addr1
))
1554 rx
->local
->dot11MulticastReceivedFrameCount
++;
1556 ieee80211_led_rx(rx
->local
);
1560 static ieee80211_rx_result debug_noinline
1561 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1563 u8
*data
= rx
->skb
->data
;
1564 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1566 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1569 /* remove the qos control field, update frame type and meta-data */
1570 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1571 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1572 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1573 /* change frame type to non QOS */
1574 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1580 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1582 if (unlikely(!rx
->sta
||
1583 !test_sta_flag(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1590 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1592 struct sk_buff
*skb
= rx
->skb
;
1593 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1596 * Pass through unencrypted frames if the hardware has
1597 * decrypted them already.
1599 if (status
->flag
& RX_FLAG_DECRYPTED
)
1602 /* Drop unencrypted frames if key is set. */
1603 if (unlikely(!ieee80211_has_protected(fc
) &&
1604 !ieee80211_is_nullfunc(fc
) &&
1605 ieee80211_is_data(fc
) &&
1606 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1613 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1615 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1616 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1617 __le16 fc
= hdr
->frame_control
;
1620 * Pass through unencrypted frames if the hardware has
1621 * decrypted them already.
1623 if (status
->flag
& RX_FLAG_DECRYPTED
)
1626 if (rx
->sta
&& test_sta_flag(rx
->sta
, WLAN_STA_MFP
)) {
1627 if (unlikely(!ieee80211_has_protected(fc
) &&
1628 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1630 if (ieee80211_is_deauth(fc
))
1631 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1634 else if (ieee80211_is_disassoc(fc
))
1635 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1640 /* BIP does not use Protected field, so need to check MMIE */
1641 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1642 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1643 if (ieee80211_is_deauth(fc
))
1644 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1647 else if (ieee80211_is_disassoc(fc
))
1648 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1654 * When using MFP, Action frames are not allowed prior to
1655 * having configured keys.
1657 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1658 ieee80211_is_robust_mgmt_frame(
1659 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1667 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
, bool *port_control
)
1669 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1670 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1671 bool check_port_control
= false;
1672 struct ethhdr
*ehdr
;
1675 *port_control
= false;
1676 if (ieee80211_has_a4(hdr
->frame_control
) &&
1677 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1680 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1681 !!sdata
->u
.mgd
.use_4addr
!= !!ieee80211_has_a4(hdr
->frame_control
)) {
1683 if (!sdata
->u
.mgd
.use_4addr
)
1686 check_port_control
= true;
1689 if (is_multicast_ether_addr(hdr
->addr1
) &&
1690 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
)
1693 ret
= ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1697 ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1698 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
)
1699 *port_control
= true;
1700 else if (check_port_control
)
1707 * requires that rx->skb is a frame with ethernet header
1709 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1711 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1712 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1713 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1716 * Allow EAPOL frames to us/the PAE group address regardless
1717 * of whether the frame was encrypted or not.
1719 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1720 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1721 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1724 if (ieee80211_802_1x_port_control(rx
) ||
1725 ieee80211_drop_unencrypted(rx
, fc
))
1732 * requires that rx->skb is a frame with ethernet header
1735 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1737 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1738 struct net_device
*dev
= sdata
->dev
;
1739 struct sk_buff
*skb
, *xmit_skb
;
1740 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1741 struct sta_info
*dsta
;
1742 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1747 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1748 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1749 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1750 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1751 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1752 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1754 * send multicast frames both to higher layers in
1755 * local net stack and back to the wireless medium
1757 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1758 if (!xmit_skb
&& net_ratelimit())
1759 printk(KERN_DEBUG
"%s: failed to clone "
1760 "multicast frame\n", dev
->name
);
1762 dsta
= sta_info_get(sdata
, skb
->data
);
1765 * The destination station is associated to
1766 * this AP (in this VLAN), so send the frame
1767 * directly to it and do not pass it to local
1777 int align __maybe_unused
;
1779 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1781 * 'align' will only take the values 0 or 2 here
1782 * since all frames are required to be aligned
1783 * to 2-byte boundaries when being passed to
1784 * mac80211. That also explains the __skb_push()
1787 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1789 if (WARN_ON(skb_headroom(skb
) < 3)) {
1793 u8
*data
= skb
->data
;
1794 size_t len
= skb_headlen(skb
);
1796 memmove(skb
->data
, data
, len
);
1797 skb_set_tail_pointer(skb
, len
);
1803 /* deliver to local stack */
1804 skb
->protocol
= eth_type_trans(skb
, dev
);
1805 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1806 netif_receive_skb(skb
);
1811 /* send to wireless media */
1812 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1813 skb_reset_network_header(xmit_skb
);
1814 skb_reset_mac_header(xmit_skb
);
1815 dev_queue_xmit(xmit_skb
);
1819 static ieee80211_rx_result debug_noinline
1820 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1822 struct net_device
*dev
= rx
->sdata
->dev
;
1823 struct sk_buff
*skb
= rx
->skb
;
1824 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1825 __le16 fc
= hdr
->frame_control
;
1826 struct sk_buff_head frame_list
;
1827 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1829 if (unlikely(!ieee80211_is_data(fc
)))
1832 if (unlikely(!ieee80211_is_data_present(fc
)))
1833 return RX_DROP_MONITOR
;
1835 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1838 if (ieee80211_has_a4(hdr
->frame_control
) &&
1839 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1840 !rx
->sdata
->u
.vlan
.sta
)
1841 return RX_DROP_UNUSABLE
;
1843 if (is_multicast_ether_addr(hdr
->addr1
) &&
1844 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1845 rx
->sdata
->u
.vlan
.sta
) ||
1846 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1847 rx
->sdata
->u
.mgd
.use_4addr
)))
1848 return RX_DROP_UNUSABLE
;
1851 __skb_queue_head_init(&frame_list
);
1853 if (skb_linearize(skb
))
1854 return RX_DROP_UNUSABLE
;
1856 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1857 rx
->sdata
->vif
.type
,
1858 rx
->local
->hw
.extra_tx_headroom
, true);
1860 while (!skb_queue_empty(&frame_list
)) {
1861 rx
->skb
= __skb_dequeue(&frame_list
);
1863 if (!ieee80211_frame_allowed(rx
, fc
)) {
1864 dev_kfree_skb(rx
->skb
);
1867 dev
->stats
.rx_packets
++;
1868 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1870 ieee80211_deliver_skb(rx
);
1876 #ifdef CONFIG_MAC80211_MESH
1877 static ieee80211_rx_result
1878 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1880 struct ieee80211_hdr
*hdr
;
1881 struct ieee80211s_hdr
*mesh_hdr
;
1882 unsigned int hdrlen
;
1883 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1884 struct ieee80211_local
*local
= rx
->local
;
1885 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1886 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1888 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1889 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1890 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1892 /* frame is in RMC, don't forward */
1893 if (ieee80211_is_data(hdr
->frame_control
) &&
1894 is_multicast_ether_addr(hdr
->addr1
) &&
1895 mesh_rmc_check(hdr
->addr3
, mesh_hdr
, rx
->sdata
))
1896 return RX_DROP_MONITOR
;
1898 if (!ieee80211_is_data(hdr
->frame_control
))
1903 return RX_DROP_MONITOR
;
1905 if (ieee80211_queue_stopped(&local
->hw
, skb_get_queue_mapping(skb
))) {
1906 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1907 dropped_frames_congestion
);
1908 return RX_DROP_MONITOR
;
1911 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1912 struct mesh_path
*mppath
;
1916 if (is_multicast_ether_addr(hdr
->addr1
)) {
1917 mpp_addr
= hdr
->addr3
;
1918 proxied_addr
= mesh_hdr
->eaddr1
;
1920 mpp_addr
= hdr
->addr4
;
1921 proxied_addr
= mesh_hdr
->eaddr2
;
1925 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1927 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1929 spin_lock_bh(&mppath
->state_lock
);
1930 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1931 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1932 spin_unlock_bh(&mppath
->state_lock
);
1937 /* Frame has reached destination. Don't forward */
1938 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1939 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1944 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1946 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1947 dropped_frames_ttl
);
1949 struct ieee80211_hdr
*fwd_hdr
;
1950 struct ieee80211_tx_info
*info
;
1952 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1954 if (!fwd_skb
&& net_ratelimit())
1955 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1960 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1961 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1962 info
= IEEE80211_SKB_CB(fwd_skb
);
1963 memset(info
, 0, sizeof(*info
));
1964 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1965 info
->control
.vif
= &rx
->sdata
->vif
;
1966 if (is_multicast_ether_addr(fwd_hdr
->addr1
)) {
1967 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1969 skb_set_queue_mapping(fwd_skb
,
1970 ieee80211_select_queue(sdata
, fwd_skb
));
1971 ieee80211_set_qos_hdr(sdata
, fwd_skb
);
1975 * Save TA to addr1 to send TA a path error if a
1976 * suitable next hop is not found
1978 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1980 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1981 /* Failed to immediately resolve next hop:
1982 * fwded frame was dropped or will be added
1983 * later to the pending skb queue. */
1985 return RX_DROP_MONITOR
;
1987 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1990 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1992 ieee80211_add_pending_skb(local
, fwd_skb
);
1997 if (is_multicast_ether_addr(hdr
->addr1
) ||
1998 sdata
->dev
->flags
& IFF_PROMISC
)
2001 return RX_DROP_MONITOR
;
2005 static ieee80211_rx_result debug_noinline
2006 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
2008 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2009 struct ieee80211_local
*local
= rx
->local
;
2010 struct net_device
*dev
= sdata
->dev
;
2011 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
2012 __le16 fc
= hdr
->frame_control
;
2016 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
2019 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
2020 return RX_DROP_MONITOR
;
2023 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2024 * that a 4-addr station can be detected and moved into a separate VLAN
2026 if (ieee80211_has_a4(hdr
->frame_control
) &&
2027 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
2028 return RX_DROP_MONITOR
;
2030 err
= __ieee80211_data_to_8023(rx
, &port_control
);
2032 return RX_DROP_UNUSABLE
;
2034 if (!ieee80211_frame_allowed(rx
, fc
))
2035 return RX_DROP_MONITOR
;
2037 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
2038 unlikely(port_control
) && sdata
->bss
) {
2039 sdata
= container_of(sdata
->bss
, struct ieee80211_sub_if_data
,
2047 dev
->stats
.rx_packets
++;
2048 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
2050 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
2051 !is_multicast_ether_addr(
2052 ((struct ethhdr
*)rx
->skb
->data
)->h_dest
) &&
2053 (!local
->scanning
&&
2054 !test_bit(SDATA_STATE_OFFCHANNEL
, &sdata
->state
))) {
2055 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
2056 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
2059 ieee80211_deliver_skb(rx
);
2064 static ieee80211_rx_result debug_noinline
2065 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
2067 struct ieee80211_local
*local
= rx
->local
;
2068 struct ieee80211_hw
*hw
= &local
->hw
;
2069 struct sk_buff
*skb
= rx
->skb
;
2070 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
2071 struct tid_ampdu_rx
*tid_agg_rx
;
2075 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
2078 if (ieee80211_is_back_req(bar
->frame_control
)) {
2080 __le16 control
, start_seq_num
;
2081 } __packed bar_data
;
2084 return RX_DROP_MONITOR
;
2086 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
2087 &bar_data
, sizeof(bar_data
)))
2088 return RX_DROP_MONITOR
;
2090 tid
= le16_to_cpu(bar_data
.control
) >> 12;
2092 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
2094 return RX_DROP_MONITOR
;
2096 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
2098 /* reset session timer */
2099 if (tid_agg_rx
->timeout
)
2100 mod_timer(&tid_agg_rx
->session_timer
,
2101 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2103 spin_lock(&tid_agg_rx
->reorder_lock
);
2104 /* release stored frames up to start of BAR */
2105 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
);
2106 spin_unlock(&tid_agg_rx
->reorder_lock
);
2113 * After this point, we only want management frames,
2114 * so we can drop all remaining control frames to
2115 * cooked monitor interfaces.
2117 return RX_DROP_MONITOR
;
2120 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
2121 struct ieee80211_mgmt
*mgmt
,
2124 struct ieee80211_local
*local
= sdata
->local
;
2125 struct sk_buff
*skb
;
2126 struct ieee80211_mgmt
*resp
;
2128 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
2129 /* Not to own unicast address */
2133 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2134 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2135 /* Not from the current AP or not associated yet. */
2139 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2140 /* Too short SA Query request frame */
2144 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2148 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2149 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2150 memset(resp
, 0, 24);
2151 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2152 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2153 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2154 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2155 IEEE80211_STYPE_ACTION
);
2156 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2157 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2158 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2159 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2160 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2161 WLAN_SA_QUERY_TR_ID_LEN
);
2163 ieee80211_tx_skb(sdata
, skb
);
2166 static ieee80211_rx_result debug_noinline
2167 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2169 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2170 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2173 * From here on, look only at management frames.
2174 * Data and control frames are already handled,
2175 * and unknown (reserved) frames are useless.
2177 if (rx
->skb
->len
< 24)
2178 return RX_DROP_MONITOR
;
2180 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2181 return RX_DROP_MONITOR
;
2183 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2184 return RX_DROP_MONITOR
;
2186 if (ieee80211_drop_unencrypted_mgmt(rx
))
2187 return RX_DROP_UNUSABLE
;
2192 static ieee80211_rx_result debug_noinline
2193 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2195 struct ieee80211_local
*local
= rx
->local
;
2196 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2197 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2198 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2199 int len
= rx
->skb
->len
;
2201 if (!ieee80211_is_action(mgmt
->frame_control
))
2204 /* drop too small frames */
2205 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2206 return RX_DROP_UNUSABLE
;
2208 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2209 return RX_DROP_UNUSABLE
;
2211 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2212 return RX_DROP_UNUSABLE
;
2214 switch (mgmt
->u
.action
.category
) {
2215 case WLAN_CATEGORY_BACK
:
2217 * The aggregation code is not prepared to handle
2218 * anything but STA/AP due to the BSSID handling;
2219 * IBSS could work in the code but isn't supported
2220 * by drivers or the standard.
2222 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2223 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2224 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2227 /* verify action_code is present */
2228 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2231 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2232 case WLAN_ACTION_ADDBA_REQ
:
2233 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2234 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2237 case WLAN_ACTION_ADDBA_RESP
:
2238 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2239 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2242 case WLAN_ACTION_DELBA
:
2243 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2244 sizeof(mgmt
->u
.action
.u
.delba
)))
2252 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2253 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2256 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2259 /* verify action_code is present */
2260 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2263 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2264 case WLAN_ACTION_SPCT_MSR_REQ
:
2265 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2266 sizeof(mgmt
->u
.action
.u
.measurement
)))
2268 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2270 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2271 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2272 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2275 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2278 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2284 case WLAN_CATEGORY_SA_QUERY
:
2285 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2286 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2289 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2290 case WLAN_ACTION_SA_QUERY_REQUEST
:
2291 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2293 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2297 case WLAN_CATEGORY_SELF_PROTECTED
:
2298 switch (mgmt
->u
.action
.u
.self_prot
.action_code
) {
2299 case WLAN_SP_MESH_PEERING_OPEN
:
2300 case WLAN_SP_MESH_PEERING_CLOSE
:
2301 case WLAN_SP_MESH_PEERING_CONFIRM
:
2302 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2304 if (sdata
->u
.mesh
.security
!= IEEE80211_MESH_SEC_NONE
)
2305 /* userspace handles this frame */
2308 case WLAN_SP_MGK_INFORM
:
2309 case WLAN_SP_MGK_ACK
:
2310 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2315 case WLAN_CATEGORY_MESH_ACTION
:
2316 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2318 if (mesh_action_is_path_sel(mgmt
) &&
2319 (!mesh_path_sel_is_hwmp(sdata
)))
2327 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2328 /* will return in the next handlers */
2333 rx
->sta
->rx_packets
++;
2334 dev_kfree_skb(rx
->skb
);
2338 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2339 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2340 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2342 rx
->sta
->rx_packets
++;
2346 static ieee80211_rx_result debug_noinline
2347 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2349 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2351 /* skip known-bad action frames and return them in the next handler */
2352 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2356 * Getting here means the kernel doesn't know how to handle
2357 * it, but maybe userspace does ... include returned frames
2358 * so userspace can register for those to know whether ones
2359 * it transmitted were processed or returned.
2362 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2363 rx
->skb
->data
, rx
->skb
->len
,
2366 rx
->sta
->rx_packets
++;
2367 dev_kfree_skb(rx
->skb
);
2375 static ieee80211_rx_result debug_noinline
2376 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2378 struct ieee80211_local
*local
= rx
->local
;
2379 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2380 struct sk_buff
*nskb
;
2381 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2382 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2384 if (!ieee80211_is_action(mgmt
->frame_control
))
2388 * For AP mode, hostapd is responsible for handling any action
2389 * frames that we didn't handle, including returning unknown
2390 * ones. For all other modes we will return them to the sender,
2391 * setting the 0x80 bit in the action category, as required by
2392 * 802.11-2007 7.3.1.11.
2393 * Newer versions of hostapd shall also use the management frame
2394 * registration mechanisms, but older ones still use cooked
2395 * monitor interfaces so push all frames there.
2397 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2398 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2399 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2400 return RX_DROP_MONITOR
;
2402 /* do not return rejected action frames */
2403 if (mgmt
->u
.action
.category
& 0x80)
2404 return RX_DROP_UNUSABLE
;
2406 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2409 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2411 nmgmt
->u
.action
.category
|= 0x80;
2412 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2413 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2415 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2417 ieee80211_tx_skb(rx
->sdata
, nskb
);
2419 dev_kfree_skb(rx
->skb
);
2423 static ieee80211_rx_result debug_noinline
2424 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2426 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2427 ieee80211_rx_result rxs
;
2428 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2431 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2432 if (rxs
!= RX_CONTINUE
)
2435 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2437 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2438 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2439 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2440 return RX_DROP_MONITOR
;
2443 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2444 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2445 /* process for all: mesh, mlme, ibss */
2447 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2448 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2449 if (is_multicast_ether_addr(mgmt
->da
) &&
2450 !is_broadcast_ether_addr(mgmt
->da
))
2451 return RX_DROP_MONITOR
;
2453 /* process only for station */
2454 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2455 return RX_DROP_MONITOR
;
2457 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2458 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2459 /* process only for ibss */
2460 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2461 return RX_DROP_MONITOR
;
2464 return RX_DROP_MONITOR
;
2467 /* queue up frame and kick off work to process it */
2468 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2469 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2470 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2472 rx
->sta
->rx_packets
++;
2477 /* TODO: use IEEE80211_RX_FRAGMENTED */
2478 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2479 struct ieee80211_rate
*rate
)
2481 struct ieee80211_sub_if_data
*sdata
;
2482 struct ieee80211_local
*local
= rx
->local
;
2483 struct ieee80211_rtap_hdr
{
2484 struct ieee80211_radiotap_header hdr
;
2490 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2491 struct net_device
*prev_dev
= NULL
;
2492 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2495 * If cooked monitor has been processed already, then
2496 * don't do it again. If not, set the flag.
2498 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2500 rx
->flags
|= IEEE80211_RX_CMNTR
;
2502 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2503 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2506 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2507 memset(rthdr
, 0, sizeof(*rthdr
));
2508 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2509 rthdr
->hdr
.it_present
=
2510 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2511 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2514 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2515 rthdr
->hdr
.it_present
|=
2516 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2518 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2520 if (status
->band
== IEEE80211_BAND_5GHZ
)
2521 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2522 IEEE80211_CHAN_5GHZ
);
2524 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2525 IEEE80211_CHAN_2GHZ
);
2527 skb_set_mac_header(skb
, 0);
2528 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2529 skb
->pkt_type
= PACKET_OTHERHOST
;
2530 skb
->protocol
= htons(ETH_P_802_2
);
2532 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2533 if (!ieee80211_sdata_running(sdata
))
2536 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2537 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2541 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2543 skb2
->dev
= prev_dev
;
2544 netif_receive_skb(skb2
);
2548 prev_dev
= sdata
->dev
;
2549 sdata
->dev
->stats
.rx_packets
++;
2550 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2554 skb
->dev
= prev_dev
;
2555 netif_receive_skb(skb
);
2563 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2564 ieee80211_rx_result res
)
2567 case RX_DROP_MONITOR
:
2568 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2570 rx
->sta
->rx_dropped
++;
2573 struct ieee80211_rate
*rate
= NULL
;
2574 struct ieee80211_supported_band
*sband
;
2575 struct ieee80211_rx_status
*status
;
2577 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2579 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2580 if (!(status
->flag
& RX_FLAG_HT
))
2581 rate
= &sband
->bitrates
[status
->rate_idx
];
2583 ieee80211_rx_cooked_monitor(rx
, rate
);
2586 case RX_DROP_UNUSABLE
:
2587 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2589 rx
->sta
->rx_dropped
++;
2590 dev_kfree_skb(rx
->skb
);
2593 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2598 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
)
2600 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2601 struct sk_buff
*skb
;
2603 #define CALL_RXH(rxh) \
2606 if (res != RX_CONTINUE) \
2610 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2611 if (rx
->local
->running_rx_handler
)
2614 rx
->local
->running_rx_handler
= true;
2616 while ((skb
= __skb_dequeue(&rx
->local
->rx_skb_queue
))) {
2617 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2620 * all the other fields are valid across frames
2621 * that belong to an aMPDU since they are on the
2622 * same TID from the same station
2626 CALL_RXH(ieee80211_rx_h_decrypt
)
2627 CALL_RXH(ieee80211_rx_h_check_more_data
)
2628 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll
)
2629 CALL_RXH(ieee80211_rx_h_sta_process
)
2630 CALL_RXH(ieee80211_rx_h_defragment
)
2631 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2632 /* must be after MMIC verify so header is counted in MPDU mic */
2633 #ifdef CONFIG_MAC80211_MESH
2634 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2635 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2637 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2638 CALL_RXH(ieee80211_rx_h_amsdu
)
2639 CALL_RXH(ieee80211_rx_h_data
)
2640 CALL_RXH(ieee80211_rx_h_ctrl
);
2641 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2642 CALL_RXH(ieee80211_rx_h_action
)
2643 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2644 CALL_RXH(ieee80211_rx_h_action_return
)
2645 CALL_RXH(ieee80211_rx_h_mgmt
)
2648 ieee80211_rx_handlers_result(rx
, res
);
2649 spin_lock(&rx
->local
->rx_skb_queue
.lock
);
2653 rx
->local
->running_rx_handler
= false;
2656 spin_unlock(&rx
->local
->rx_skb_queue
.lock
);
2659 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2661 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2663 #define CALL_RXH(rxh) \
2666 if (res != RX_CONTINUE) \
2670 CALL_RXH(ieee80211_rx_h_passive_scan
)
2671 CALL_RXH(ieee80211_rx_h_check
)
2673 ieee80211_rx_reorder_ampdu(rx
);
2675 ieee80211_rx_handlers(rx
);
2679 ieee80211_rx_handlers_result(rx
, res
);
2685 * This function makes calls into the RX path, therefore
2686 * it has to be invoked under RCU read lock.
2688 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2690 struct ieee80211_rx_data rx
= {
2692 .sdata
= sta
->sdata
,
2693 .local
= sta
->local
,
2694 /* This is OK -- must be QoS data frame */
2695 .security_idx
= tid
,
2699 struct tid_ampdu_rx
*tid_agg_rx
;
2701 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2705 spin_lock(&tid_agg_rx
->reorder_lock
);
2706 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
);
2707 spin_unlock(&tid_agg_rx
->reorder_lock
);
2709 ieee80211_rx_handlers(&rx
);
2712 /* main receive path */
2714 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2715 struct ieee80211_hdr
*hdr
)
2717 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2718 struct sk_buff
*skb
= rx
->skb
;
2719 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2720 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2721 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2723 switch (sdata
->vif
.type
) {
2724 case NL80211_IFTYPE_STATION
:
2725 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2728 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2729 if (!(sdata
->dev
->flags
& IFF_PROMISC
) ||
2730 sdata
->u
.mgd
.use_4addr
)
2732 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2735 case NL80211_IFTYPE_ADHOC
:
2738 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2741 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2742 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2744 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2745 } else if (!multicast
&&
2746 compare_ether_addr(sdata
->vif
.addr
,
2748 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2750 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2751 } else if (!rx
->sta
) {
2753 if (status
->flag
& RX_FLAG_HT
)
2754 rate_idx
= 0; /* TODO: HT rates */
2756 rate_idx
= status
->rate_idx
;
2757 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2758 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2761 case NL80211_IFTYPE_MESH_POINT
:
2763 compare_ether_addr(sdata
->vif
.addr
,
2765 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2768 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2771 case NL80211_IFTYPE_AP_VLAN
:
2772 case NL80211_IFTYPE_AP
:
2774 if (compare_ether_addr(sdata
->vif
.addr
,
2777 } else if (!ieee80211_bssid_match(bssid
,
2779 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
) &&
2780 !ieee80211_is_beacon(hdr
->frame_control
) &&
2781 !(ieee80211_is_action(hdr
->frame_control
) &&
2784 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2787 case NL80211_IFTYPE_WDS
:
2788 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2790 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2794 /* should never get here */
2803 * This function returns whether or not the SKB
2804 * was destined for RX processing or not, which,
2805 * if consume is true, is equivalent to whether
2806 * or not the skb was consumed.
2808 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2809 struct sk_buff
*skb
, bool consume
)
2811 struct ieee80211_local
*local
= rx
->local
;
2812 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2813 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2814 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2818 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2819 prepares
= prepare_for_handlers(rx
, hdr
);
2825 skb
= skb_copy(skb
, GFP_ATOMIC
);
2827 if (net_ratelimit())
2828 wiphy_debug(local
->hw
.wiphy
,
2829 "failed to copy skb for %s\n",
2837 ieee80211_invoke_rx_handlers(rx
);
2842 * This is the actual Rx frames handler. as it blongs to Rx path it must
2843 * be called with rcu_read_lock protection.
2845 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2846 struct sk_buff
*skb
)
2848 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2849 struct ieee80211_local
*local
= hw_to_local(hw
);
2850 struct ieee80211_sub_if_data
*sdata
;
2851 struct ieee80211_hdr
*hdr
;
2853 struct ieee80211_rx_data rx
;
2854 struct ieee80211_sub_if_data
*prev
;
2855 struct sta_info
*sta
, *tmp
, *prev_sta
;
2858 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2859 memset(&rx
, 0, sizeof(rx
));
2863 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2864 local
->dot11ReceivedFragmentCount
++;
2866 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2867 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2868 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2870 if (ieee80211_is_mgmt(fc
))
2871 err
= skb_linearize(skb
);
2873 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2880 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2881 ieee80211_parse_qos(&rx
);
2882 ieee80211_verify_alignment(&rx
);
2884 if (ieee80211_is_data(fc
)) {
2887 for_each_sta_info_rx(local
, hdr
->addr2
, sta
, tmp
) {
2894 rx
.sdata
= prev_sta
->sdata
;
2895 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2902 rx
.sdata
= prev_sta
->sdata
;
2904 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2912 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2913 if (!ieee80211_sdata_running(sdata
))
2916 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2917 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2921 * frame is destined for this interface, but if it's
2922 * not also for the previous one we handle that after
2923 * the loop to avoid copying the SKB once too much
2931 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2933 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2939 rx
.sta
= sta_info_get_bss_rx(prev
, hdr
->addr2
);
2942 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2951 * This is the receive path handler. It is called by a low level driver when an
2952 * 802.11 MPDU is received from the hardware.
2954 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2956 struct ieee80211_local
*local
= hw_to_local(hw
);
2957 struct ieee80211_rate
*rate
= NULL
;
2958 struct ieee80211_supported_band
*sband
;
2959 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2961 WARN_ON_ONCE(softirq_count() == 0);
2963 if (WARN_ON(status
->band
< 0 ||
2964 status
->band
>= IEEE80211_NUM_BANDS
))
2967 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2968 if (WARN_ON(!sband
))
2972 * If we're suspending, it is possible although not too likely
2973 * that we'd be receiving frames after having already partially
2974 * quiesced the stack. We can't process such frames then since
2975 * that might, for example, cause stations to be added or other
2976 * driver callbacks be invoked.
2978 if (unlikely(local
->quiescing
|| local
->suspended
))
2982 * The same happens when we're not even started,
2983 * but that's worth a warning.
2985 if (WARN_ON(!local
->started
))
2988 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2990 * Validate the rate, unless a PLCP error means that
2991 * we probably can't have a valid rate here anyway.
2994 if (status
->flag
& RX_FLAG_HT
) {
2996 * rate_idx is MCS index, which can be [0-76]
2999 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3001 * Anything else would be some sort of driver or
3002 * hardware error. The driver should catch hardware
3005 if (WARN((status
->rate_idx
< 0 ||
3006 status
->rate_idx
> 76),
3007 "Rate marked as an HT rate but passed "
3008 "status->rate_idx is not "
3009 "an MCS index [0-76]: %d (0x%02x)\n",
3014 if (WARN_ON(status
->rate_idx
< 0 ||
3015 status
->rate_idx
>= sband
->n_bitrates
))
3017 rate
= &sband
->bitrates
[status
->rate_idx
];
3021 status
->rx_flags
= 0;
3024 * key references and virtual interfaces are protected using RCU
3025 * and this requires that we are in a read-side RCU section during
3026 * receive processing
3031 * Frames with failed FCS/PLCP checksum are not returned,
3032 * all other frames are returned without radiotap header
3033 * if it was previously present.
3034 * Also, frames with less than 16 bytes are dropped.
3036 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
3042 ieee80211_tpt_led_trig_rx(local
,
3043 ((struct ieee80211_hdr
*)skb
->data
)->frame_control
,
3045 __ieee80211_rx_handle_packet(hw
, skb
);
3053 EXPORT_SYMBOL(ieee80211_rx
);
3055 /* This is a version of the rx handler that can be called from hard irq
3056 * context. Post the skb on the queue and schedule the tasklet */
3057 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
3059 struct ieee80211_local
*local
= hw_to_local(hw
);
3061 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
3063 skb
->pkt_type
= IEEE80211_RX_MSG
;
3064 skb_queue_tail(&local
->skb_queue
, skb
);
3065 tasklet_schedule(&local
->tasklet
);
3067 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);