2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
32 * monitor mode reception
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
37 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
40 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
41 if (likely(skb
->len
> FCS_LEN
))
42 __pskb_trim(skb
, skb
->len
- FCS_LEN
);
54 static inline int should_drop_frame(struct sk_buff
*skb
,
57 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
58 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
60 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
62 if (unlikely(skb
->len
< 16 + present_fcs_len
))
64 if (ieee80211_is_ctl(hdr
->frame_control
) &&
65 !ieee80211_is_pspoll(hdr
->frame_control
) &&
66 !ieee80211_is_back_req(hdr
->frame_control
))
72 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
73 struct ieee80211_rx_status
*status
)
77 /* always present fields */
78 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
80 if (status
->flag
& RX_FLAG_TSFT
)
82 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
85 if (len
& 1) /* padding for RX_FLAGS if necessary */
92 * ieee80211_add_rx_radiotap_header - add radiotap header
94 * add a radiotap header containing all the fields which the hardware provided.
97 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
99 struct ieee80211_rate
*rate
,
102 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
103 struct ieee80211_radiotap_header
*rthdr
;
107 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
108 memset(rthdr
, 0, rtap_len
);
110 /* radiotap header, set always present flags */
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
113 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
116 rthdr
->it_len
= cpu_to_le16(rtap_len
);
118 pos
= (unsigned char *)(rthdr
+1);
120 /* the order of the following fields is important */
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status
->flag
& RX_FLAG_TSFT
) {
124 put_unaligned_le64(status
->mactime
, pos
);
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
132 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
133 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
134 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
135 if (status
->flag
& RX_FLAG_SHORTPRE
)
136 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
139 /* IEEE80211_RADIOTAP_RATE */
140 if (status
->flag
& RX_FLAG_HT
) {
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
151 *pos
= rate
->bitrate
/ 5;
155 /* IEEE80211_RADIOTAP_CHANNEL */
156 put_unaligned_le16(status
->freq
, pos
);
158 if (status
->band
== IEEE80211_BAND_5GHZ
)
159 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
161 else if (status
->flag
& RX_FLAG_HT
)
162 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
164 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
168 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
174 *pos
= status
->signal
;
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos
= status
->antenna
;
186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
190 if ((pos
- (u8
*)rthdr
) & 1)
192 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
193 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
194 put_unaligned_le16(rx_flags
, pos
);
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
203 static struct sk_buff
*
204 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
205 struct ieee80211_rate
*rate
)
207 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
208 struct ieee80211_sub_if_data
*sdata
;
209 int needed_headroom
= 0;
210 struct sk_buff
*skb
, *skb2
;
211 struct net_device
*prev_dev
= NULL
;
212 int present_fcs_len
= 0;
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
223 /* room for the radiotap header based on driver features */
224 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
226 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
227 present_fcs_len
= FCS_LEN
;
229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb
, 2)) {
231 dev_kfree_skb(origskb
);
235 if (!local
->monitors
) {
236 if (should_drop_frame(origskb
, present_fcs_len
)) {
237 dev_kfree_skb(origskb
);
241 return remove_monitor_info(local
, origskb
);
244 if (should_drop_frame(origskb
, present_fcs_len
)) {
245 /* only need to expand headroom if necessary */
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
256 if (skb_headroom(skb
) < needed_headroom
&&
257 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
266 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
268 origskb
= remove_monitor_info(local
, origskb
);
274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
277 skb_reset_mac_header(skb
);
278 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
279 skb
->pkt_type
= PACKET_OTHERHOST
;
280 skb
->protocol
= htons(ETH_P_802_2
);
282 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
283 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
286 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
289 if (!ieee80211_sdata_running(sdata
))
293 skb2
= skb_clone(skb
, GFP_ATOMIC
);
295 skb2
->dev
= prev_dev
;
296 netif_receive_skb(skb2
);
300 prev_dev
= sdata
->dev
;
301 sdata
->dev
->stats
.rx_packets
++;
302 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
307 netif_receive_skb(skb
);
315 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
317 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
318 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
321 /* does the frame have a qos control field? */
322 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
323 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
324 /* frame has qos control */
325 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
326 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
327 status
->rx_flags
|= IEEE80211_RX_AMSDU
;
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
338 * We also use that counter for non-QoS STAs.
340 tid
= NUM_RX_DATA_QUEUES
- 1;
344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
350 * DOC: Packet alignment
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
374 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
376 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
378 "unaligned packet at 0x%p\n", rx
->skb
->data
);
385 static ieee80211_rx_result debug_noinline
386 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
388 struct ieee80211_local
*local
= rx
->local
;
389 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
390 struct sk_buff
*skb
= rx
->skb
;
392 if (likely(!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
)))
395 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
))
396 return ieee80211_scan_rx(rx
->sdata
, skb
);
398 if (test_bit(SCAN_SW_SCANNING
, &local
->scanning
)) {
399 /* drop all the other packets during a software scan anyway */
400 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
407 return RX_DROP_UNUSABLE
;
411 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
413 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
415 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
418 return ieee80211_is_robust_mgmt_frame(hdr
);
422 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
424 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
426 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
429 return ieee80211_is_robust_mgmt_frame(hdr
);
433 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
436 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
437 struct ieee80211_mmie
*mmie
;
439 if (skb
->len
< 24 + sizeof(*mmie
) ||
440 !is_multicast_ether_addr(hdr
->da
))
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
444 return -1; /* not a robust management frame */
446 mmie
= (struct ieee80211_mmie
*)
447 (skb
->data
+ skb
->len
- sizeof(*mmie
));
448 if (mmie
->element_id
!= WLAN_EID_MMIE
||
449 mmie
->length
!= sizeof(*mmie
) - 2)
452 return le16_to_cpu(mmie
->key_id
);
456 static ieee80211_rx_result
457 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
459 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
460 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
461 char *dev_addr
= rx
->sdata
->vif
.addr
;
463 if (ieee80211_is_data(hdr
->frame_control
)) {
464 if (is_multicast_ether_addr(hdr
->addr1
)) {
465 if (ieee80211_has_tods(hdr
->frame_control
) ||
466 !ieee80211_has_fromds(hdr
->frame_control
))
467 return RX_DROP_MONITOR
;
468 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
469 return RX_DROP_MONITOR
;
471 if (!ieee80211_has_a4(hdr
->frame_control
))
472 return RX_DROP_MONITOR
;
473 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
474 return RX_DROP_MONITOR
;
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
482 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
483 struct ieee80211_mgmt
*mgmt
;
485 if (!ieee80211_is_mgmt(hdr
->frame_control
))
486 return RX_DROP_MONITOR
;
488 if (ieee80211_is_action(hdr
->frame_control
)) {
489 mgmt
= (struct ieee80211_mgmt
*)hdr
;
490 if (mgmt
->u
.action
.category
!= WLAN_CATEGORY_MESH_PLINK
)
491 return RX_DROP_MONITOR
;
495 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
496 ieee80211_is_probe_resp(hdr
->frame_control
) ||
497 ieee80211_is_beacon(hdr
->frame_control
))
500 return RX_DROP_MONITOR
;
504 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
506 if (ieee80211_is_data(hdr
->frame_control
) &&
507 is_multicast_ether_addr(hdr
->addr1
) &&
508 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
509 return RX_DROP_MONITOR
;
515 #define SEQ_MODULO 0x1000
516 #define SEQ_MASK 0xfff
518 static inline int seq_less(u16 sq1
, u16 sq2
)
520 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
523 static inline u16
seq_inc(u16 sq
)
525 return (sq
+ 1) & SEQ_MASK
;
528 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
530 return (sq1
- sq2
) & SEQ_MASK
;
534 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
535 struct tid_ampdu_rx
*tid_agg_rx
,
537 struct sk_buff_head
*frames
)
539 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
541 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
546 /* release the frame from the reorder ring buffer */
547 tid_agg_rx
->stored_mpdu_num
--;
548 tid_agg_rx
->reorder_buf
[index
] = NULL
;
549 __skb_queue_tail(frames
, skb
);
552 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
555 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
556 struct tid_ampdu_rx
*tid_agg_rx
,
558 struct sk_buff_head
*frames
)
562 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
564 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
565 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
566 tid_agg_rx
->buf_size
;
567 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
572 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
573 * the skb was added to the buffer longer than this time ago, the earlier
574 * frames that have not yet been received are assumed to be lost and the skb
575 * can be released for processing. This may also release other skb's from the
576 * reorder buffer if there are no additional gaps between the frames.
578 * Callers must hold tid_agg_rx->reorder_lock.
580 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
582 static void ieee80211_sta_reorder_release(struct ieee80211_hw
*hw
,
583 struct tid_ampdu_rx
*tid_agg_rx
,
584 struct sk_buff_head
*frames
)
588 lockdep_assert_held(&tid_agg_rx
->reorder_lock
);
590 /* release the buffer until next missing frame */
591 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
592 tid_agg_rx
->buf_size
;
593 if (!tid_agg_rx
->reorder_buf
[index
] &&
594 tid_agg_rx
->stored_mpdu_num
> 1) {
596 * No buffers ready to be released, but check whether any
597 * frames in the reorder buffer have timed out.
600 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
601 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
602 if (!tid_agg_rx
->reorder_buf
[j
]) {
606 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
607 HT_RX_REORDER_BUF_TIMEOUT
))
608 goto set_release_timer
;
610 #ifdef CONFIG_MAC80211_HT_DEBUG
612 wiphy_debug(hw
->wiphy
,
613 "release an RX reorder frame due to timeout on earlier frames\n");
615 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
619 * Increment the head seq# also for the skipped slots.
621 tid_agg_rx
->head_seq_num
=
622 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
625 } else while (tid_agg_rx
->reorder_buf
[index
]) {
626 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
627 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
628 tid_agg_rx
->buf_size
;
632 * Disable the reorder release timer for now.
634 * The current implementation lacks a proper locking scheme
635 * which would protect vital statistic and debug counters
636 * from being updated by two different but concurrent BHs.
638 * More information about the topic is available from:
639 * - thread: http://marc.info/?t=128635927000001
642 * => http://marc.info/?l=linux-wireless&m=128636170811964
643 * "Basically the thing is that until your patch, the data
644 * in the struct didn't actually need locking because it
645 * was accessed by the RX path only which is not concurrent."
647 * List of what needs to be fixed:
648 * => http://marc.info/?l=linux-wireless&m=128656352920957
651 if (tid_agg_rx->stored_mpdu_num) {
652 j = index = seq_sub(tid_agg_rx->head_seq_num,
653 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
655 for (; j != (index - 1) % tid_agg_rx->buf_size;
656 j = (j + 1) % tid_agg_rx->buf_size) {
657 if (tid_agg_rx->reorder_buf[j])
663 mod_timer(&tid_agg_rx->reorder_timer,
664 tid_agg_rx->reorder_time[j] +
665 HT_RX_REORDER_BUF_TIMEOUT);
667 del_timer(&tid_agg_rx->reorder_timer);
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
680 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
681 struct tid_ampdu_rx
*tid_agg_rx
,
683 struct sk_buff_head
*frames
)
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
,
714 /* Now the new frame is always in the range of the reordering buffer */
716 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
718 /* check if we already stored this frame */
719 if (tid_agg_rx
->reorder_buf
[index
]) {
725 * If the current MPDU is in the right order and nothing else
726 * is stored we can process it directly, no need to buffer it.
728 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
729 tid_agg_rx
->stored_mpdu_num
== 0) {
730 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
735 /* put the frame in the reordering buffer */
736 tid_agg_rx
->reorder_buf
[index
] = skb
;
737 tid_agg_rx
->reorder_time
[index
] = jiffies
;
738 tid_agg_rx
->stored_mpdu_num
++;
739 ieee80211_sta_reorder_release(hw
, tid_agg_rx
, frames
);
742 spin_unlock(&tid_agg_rx
->reorder_lock
);
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
750 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
751 struct sk_buff_head
*frames
)
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
, frames
))
810 __skb_queue_tail(frames
, 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
->queue
] ==
824 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
825 rx
->local
->dot11FrameDuplicateCount
++;
826 rx
->sta
->num_duplicates
++;
828 return RX_DROP_MONITOR
;
830 rx
->sta
->last_seq_ctrl
[rx
->queue
] = 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_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
855 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
856 !ieee80211_has_tods(hdr
->frame_control
) &&
857 ieee80211_is_data(hdr
->frame_control
)) ||
858 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
)) {
859 /* Drop IBSS frames and frames for other hosts
861 return RX_DROP_MONITOR
;
864 return RX_DROP_MONITOR
;
871 static ieee80211_rx_result debug_noinline
872 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
874 struct sk_buff
*skb
= rx
->skb
;
875 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
876 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
879 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
880 struct ieee80211_key
*sta_ptk
= NULL
;
881 int mmie_keyidx
= -1;
887 * There are four types of keys:
889 * - IGTK (group keys for management frames)
890 * - PTK (pairwise keys)
891 * - STK (station-to-station pairwise keys)
893 * When selecting a key, we have to distinguish between multicast
894 * (including broadcast) and unicast frames, the latter can only
895 * use PTKs and STKs while the former always use GTKs and IGTKs.
896 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
897 * unicast frames can also use key indices like GTKs. Hence, if we
898 * don't have a PTK/STK we check the key index for a WEP key.
900 * Note that in a regular BSS, multicast frames are sent by the
901 * AP only, associated stations unicast the frame to the AP first
902 * which then multicasts it on their behalf.
904 * There is also a slight problem in IBSS mode: GTKs are negotiated
905 * with each station, that is something we don't currently handle.
906 * The spec seems to expect that one negotiates the same key with
907 * every station but there's no such requirement; VLANs could be
912 * No point in finding a key and decrypting if the frame is neither
913 * addressed to us nor a multicast frame.
915 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
918 /* start without a key */
922 sta_ptk
= rcu_dereference(rx
->sta
->ptk
);
924 fc
= hdr
->frame_control
;
926 if (!ieee80211_has_protected(fc
))
927 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
929 if (!is_multicast_ether_addr(hdr
->addr1
) && sta_ptk
) {
931 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
932 (status
->flag
& RX_FLAG_IV_STRIPPED
))
934 /* Skip decryption if the frame is not protected. */
935 if (!ieee80211_has_protected(fc
))
937 } else if (mmie_keyidx
>= 0) {
938 /* Broadcast/multicast robust management frame / BIP */
939 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
940 (status
->flag
& RX_FLAG_IV_STRIPPED
))
943 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
944 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
945 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
947 rx
->key
= rcu_dereference(rx
->sta
->gtk
[mmie_keyidx
]);
949 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
950 } else if (!ieee80211_has_protected(fc
)) {
952 * The frame was not protected, so skip decryption. However, we
953 * need to set rx->key if there is a key that could have been
954 * used so that the frame may be dropped if encryption would
955 * have been expected.
957 struct ieee80211_key
*key
= NULL
;
958 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
961 if (ieee80211_is_mgmt(fc
) &&
962 is_multicast_ether_addr(hdr
->addr1
) &&
963 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
967 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
968 key
= rcu_dereference(rx
->sta
->gtk
[i
]);
974 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
975 key
= rcu_dereference(sdata
->keys
[i
]);
987 * The device doesn't give us the IV so we won't be
988 * able to look up the key. That's ok though, we
989 * don't need to decrypt the frame, we just won't
990 * be able to keep statistics accurate.
991 * Except for key threshold notifications, should
992 * we somehow allow the driver to tell us which key
993 * the hardware used if this flag is set?
995 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
996 (status
->flag
& RX_FLAG_IV_STRIPPED
))
999 hdrlen
= ieee80211_hdrlen(fc
);
1001 if (rx
->skb
->len
< 8 + hdrlen
)
1002 return RX_DROP_UNUSABLE
; /* TODO: count this? */
1005 * no need to call ieee80211_wep_get_keyidx,
1006 * it verifies a bunch of things we've done already
1008 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
1009 keyidx
= keyid
>> 6;
1011 /* check per-station GTK first, if multicast packet */
1012 if (is_multicast_ether_addr(hdr
->addr1
) && rx
->sta
)
1013 rx
->key
= rcu_dereference(rx
->sta
->gtk
[keyidx
]);
1015 /* if not found, try default key */
1017 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
1020 * RSNA-protected unicast frames should always be
1021 * sent with pairwise or station-to-station keys,
1022 * but for WEP we allow using a key index as well.
1025 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP40
&&
1026 rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_WEP104
&&
1027 !is_multicast_ether_addr(hdr
->addr1
))
1033 rx
->key
->tx_rx_count
++;
1034 /* TODO: add threshold stuff again */
1036 return RX_DROP_MONITOR
;
1039 if (skb_linearize(rx
->skb
))
1040 return RX_DROP_UNUSABLE
;
1041 /* the hdr variable is invalid now! */
1043 switch (rx
->key
->conf
.cipher
) {
1044 case WLAN_CIPHER_SUITE_WEP40
:
1045 case WLAN_CIPHER_SUITE_WEP104
:
1046 /* Check for weak IVs if possible */
1047 if (rx
->sta
&& ieee80211_is_data(fc
) &&
1048 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
1049 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
1050 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
1051 rx
->sta
->wep_weak_iv_count
++;
1053 result
= ieee80211_crypto_wep_decrypt(rx
);
1055 case WLAN_CIPHER_SUITE_TKIP
:
1056 result
= ieee80211_crypto_tkip_decrypt(rx
);
1058 case WLAN_CIPHER_SUITE_CCMP
:
1059 result
= ieee80211_crypto_ccmp_decrypt(rx
);
1061 case WLAN_CIPHER_SUITE_AES_CMAC
:
1062 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
1066 * We can reach here only with HW-only algorithms
1067 * but why didn't it decrypt the frame?!
1069 return RX_DROP_UNUSABLE
;
1072 /* either the frame has been decrypted or will be dropped */
1073 status
->flag
|= RX_FLAG_DECRYPTED
;
1078 static ieee80211_rx_result debug_noinline
1079 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
1081 struct ieee80211_local
*local
;
1082 struct ieee80211_hdr
*hdr
;
1083 struct sk_buff
*skb
;
1087 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1089 if (!local
->pspolling
)
1092 if (!ieee80211_has_fromds(hdr
->frame_control
))
1093 /* this is not from AP */
1096 if (!ieee80211_is_data(hdr
->frame_control
))
1099 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1100 /* AP has no more frames buffered for us */
1101 local
->pspolling
= false;
1105 /* more data bit is set, let's request a new frame from the AP */
1106 ieee80211_send_pspoll(local
, rx
->sdata
);
1111 static void ap_sta_ps_start(struct sta_info
*sta
)
1113 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1114 struct ieee80211_local
*local
= sdata
->local
;
1116 atomic_inc(&sdata
->bss
->num_sta_ps
);
1117 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1118 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1119 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1120 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1121 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1122 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1125 static void ap_sta_ps_end(struct sta_info
*sta
)
1127 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1129 atomic_dec(&sdata
->bss
->num_sta_ps
);
1131 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1132 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1133 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1134 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1136 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1137 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1138 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1139 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1140 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144 ieee80211_sta_ps_deliver_wakeup(sta
);
1147 static ieee80211_rx_result debug_noinline
1148 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1150 struct sta_info
*sta
= rx
->sta
;
1151 struct sk_buff
*skb
= rx
->skb
;
1152 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1153 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1159 * Update last_rx only for IBSS packets which are for the current
1160 * BSSID to avoid keeping the current IBSS network alive in cases
1161 * where other STAs start using different BSSID.
1163 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1164 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1165 NL80211_IFTYPE_ADHOC
);
1166 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1167 sta
->last_rx
= jiffies
;
1168 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1170 * Mesh beacons will update last_rx when if they are found to
1171 * match the current local configuration when processed.
1173 sta
->last_rx
= jiffies
;
1176 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
1179 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1180 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1182 sta
->rx_fragments
++;
1183 sta
->rx_bytes
+= rx
->skb
->len
;
1184 sta
->last_signal
= status
->signal
;
1185 ewma_add(&sta
->avg_signal
, -status
->signal
);
1188 * Change STA power saving mode only at the end of a frame
1189 * exchange sequence.
1191 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1192 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1193 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1194 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1196 * Ignore doze->wake transitions that are
1197 * indicated by non-data frames, the standard
1198 * is unclear here, but for example going to
1199 * PS mode and then scanning would cause a
1200 * doze->wake transition for the probe request,
1201 * and that is clearly undesirable.
1203 if (ieee80211_is_data(hdr
->frame_control
) &&
1204 !ieee80211_has_pm(hdr
->frame_control
))
1207 if (ieee80211_has_pm(hdr
->frame_control
))
1208 ap_sta_ps_start(sta
);
1213 * Drop (qos-)data::nullfunc frames silently, since they
1214 * are used only to control station power saving mode.
1216 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1217 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1218 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1221 * If we receive a 4-addr nullfunc frame from a STA
1222 * that was not moved to a 4-addr STA vlan yet, drop
1223 * the frame to the monitor interface, to make sure
1224 * that hostapd sees it
1226 if (ieee80211_has_a4(hdr
->frame_control
) &&
1227 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1228 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1229 !rx
->sdata
->u
.vlan
.sta
)))
1230 return RX_DROP_MONITOR
;
1232 * Update counter and free packet here to avoid
1233 * counting this as a dropped packed.
1236 dev_kfree_skb(rx
->skb
);
1241 } /* ieee80211_rx_h_sta_process */
1243 static inline struct ieee80211_fragment_entry
*
1244 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1245 unsigned int frag
, unsigned int seq
, int rx_queue
,
1246 struct sk_buff
**skb
)
1248 struct ieee80211_fragment_entry
*entry
;
1251 idx
= sdata
->fragment_next
;
1252 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1253 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1254 sdata
->fragment_next
= 0;
1256 if (!skb_queue_empty(&entry
->skb_list
)) {
1257 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1258 struct ieee80211_hdr
*hdr
=
1259 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1260 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1261 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1262 "addr1=%pM addr2=%pM\n",
1264 jiffies
- entry
->first_frag_time
, entry
->seq
,
1265 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1267 __skb_queue_purge(&entry
->skb_list
);
1270 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1272 entry
->first_frag_time
= jiffies
;
1274 entry
->rx_queue
= rx_queue
;
1275 entry
->last_frag
= frag
;
1277 entry
->extra_len
= 0;
1282 static inline struct ieee80211_fragment_entry
*
1283 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1284 unsigned int frag
, unsigned int seq
,
1285 int rx_queue
, struct ieee80211_hdr
*hdr
)
1287 struct ieee80211_fragment_entry
*entry
;
1290 idx
= sdata
->fragment_next
;
1291 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1292 struct ieee80211_hdr
*f_hdr
;
1296 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1298 entry
= &sdata
->fragments
[idx
];
1299 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1300 entry
->rx_queue
!= rx_queue
||
1301 entry
->last_frag
+ 1 != frag
)
1304 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1307 * Check ftype and addresses are equal, else check next fragment
1309 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1310 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1311 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1312 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1315 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1316 __skb_queue_purge(&entry
->skb_list
);
1325 static ieee80211_rx_result debug_noinline
1326 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1328 struct ieee80211_hdr
*hdr
;
1331 unsigned int frag
, seq
;
1332 struct ieee80211_fragment_entry
*entry
;
1333 struct sk_buff
*skb
;
1334 struct ieee80211_rx_status
*status
;
1336 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1337 fc
= hdr
->frame_control
;
1338 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1339 frag
= sc
& IEEE80211_SCTL_FRAG
;
1341 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1342 (rx
->skb
)->len
< 24 ||
1343 is_multicast_ether_addr(hdr
->addr1
))) {
1344 /* not fragmented */
1347 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1349 if (skb_linearize(rx
->skb
))
1350 return RX_DROP_UNUSABLE
;
1353 * skb_linearize() might change the skb->data and
1354 * previously cached variables (in this case, hdr) need to
1355 * be refreshed with the new data.
1357 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1358 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1361 /* This is the first fragment of a new frame. */
1362 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1363 rx
->queue
, &(rx
->skb
));
1364 if (rx
->key
&& rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
&&
1365 ieee80211_has_protected(fc
)) {
1366 int queue
= ieee80211_is_mgmt(fc
) ?
1367 NUM_RX_DATA_QUEUES
: rx
->queue
;
1368 /* Store CCMP PN so that we can verify that the next
1369 * fragment has a sequential PN value. */
1371 memcpy(entry
->last_pn
,
1372 rx
->key
->u
.ccmp
.rx_pn
[queue
],
1378 /* This is a fragment for a frame that should already be pending in
1379 * fragment cache. Add this fragment to the end of the pending entry.
1381 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1383 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1384 return RX_DROP_MONITOR
;
1387 /* Verify that MPDUs within one MSDU have sequential PN values.
1388 * (IEEE 802.11i, 8.3.3.4.5) */
1391 u8 pn
[CCMP_PN_LEN
], *rpn
;
1393 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_CCMP
)
1394 return RX_DROP_UNUSABLE
;
1395 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1396 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1401 queue
= ieee80211_is_mgmt(fc
) ?
1402 NUM_RX_DATA_QUEUES
: rx
->queue
;
1403 rpn
= rx
->key
->u
.ccmp
.rx_pn
[queue
];
1404 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1405 return RX_DROP_UNUSABLE
;
1406 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1409 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1410 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1411 entry
->last_frag
= frag
;
1412 entry
->extra_len
+= rx
->skb
->len
;
1413 if (ieee80211_has_morefrags(fc
)) {
1418 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1419 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1420 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1421 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1423 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1424 __skb_queue_purge(&entry
->skb_list
);
1425 return RX_DROP_UNUSABLE
;
1428 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1429 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1433 /* Complete frame has been reassembled - process it now */
1434 status
= IEEE80211_SKB_RXCB(rx
->skb
);
1435 status
->rx_flags
|= IEEE80211_RX_FRAGMENTED
;
1439 rx
->sta
->rx_packets
++;
1440 if (is_multicast_ether_addr(hdr
->addr1
))
1441 rx
->local
->dot11MulticastReceivedFrameCount
++;
1443 ieee80211_led_rx(rx
->local
);
1447 static ieee80211_rx_result debug_noinline
1448 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1450 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1451 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1452 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1454 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1455 !(status
->rx_flags
& IEEE80211_RX_RA_MATCH
)))
1458 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1459 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1460 return RX_DROP_UNUSABLE
;
1462 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1463 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1465 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1467 /* Free PS Poll skb here instead of returning RX_DROP that would
1468 * count as an dropped frame. */
1469 dev_kfree_skb(rx
->skb
);
1474 static ieee80211_rx_result debug_noinline
1475 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1477 u8
*data
= rx
->skb
->data
;
1478 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1480 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1483 /* remove the qos control field, update frame type and meta-data */
1484 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1485 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1486 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1487 /* change frame type to non QOS */
1488 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1494 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1496 if (unlikely(!rx
->sta
||
1497 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1504 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1506 struct sk_buff
*skb
= rx
->skb
;
1507 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1510 * Pass through unencrypted frames if the hardware has
1511 * decrypted them already.
1513 if (status
->flag
& RX_FLAG_DECRYPTED
)
1516 /* Drop unencrypted frames if key is set. */
1517 if (unlikely(!ieee80211_has_protected(fc
) &&
1518 !ieee80211_is_nullfunc(fc
) &&
1519 ieee80211_is_data(fc
) &&
1520 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1527 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1529 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1530 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1531 __le16 fc
= hdr
->frame_control
;
1534 * Pass through unencrypted frames if the hardware has
1535 * decrypted them already.
1537 if (status
->flag
& RX_FLAG_DECRYPTED
)
1540 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1541 if (unlikely(!ieee80211_has_protected(fc
) &&
1542 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1544 if (ieee80211_is_deauth(fc
))
1545 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1548 else if (ieee80211_is_disassoc(fc
))
1549 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1554 /* BIP does not use Protected field, so need to check MMIE */
1555 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1556 ieee80211_get_mmie_keyidx(rx
->skb
) < 0)) {
1557 if (ieee80211_is_deauth(fc
))
1558 cfg80211_send_unprot_deauth(rx
->sdata
->dev
,
1561 else if (ieee80211_is_disassoc(fc
))
1562 cfg80211_send_unprot_disassoc(rx
->sdata
->dev
,
1568 * When using MFP, Action frames are not allowed prior to
1569 * having configured keys.
1571 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1572 ieee80211_is_robust_mgmt_frame(
1573 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1581 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1583 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1584 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1586 if (ieee80211_has_a4(hdr
->frame_control
) &&
1587 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1590 if (is_multicast_ether_addr(hdr
->addr1
) &&
1591 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1592 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1595 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1599 * requires that rx->skb is a frame with ethernet header
1601 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1603 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1604 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1605 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1608 * Allow EAPOL frames to us/the PAE group address regardless
1609 * of whether the frame was encrypted or not.
1611 if (ehdr
->h_proto
== rx
->sdata
->control_port_protocol
&&
1612 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1613 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1616 if (ieee80211_802_1x_port_control(rx
) ||
1617 ieee80211_drop_unencrypted(rx
, fc
))
1624 * requires that rx->skb is a frame with ethernet header
1627 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1629 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1630 struct net_device
*dev
= sdata
->dev
;
1631 struct sk_buff
*skb
, *xmit_skb
;
1632 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1633 struct sta_info
*dsta
;
1634 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1639 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1640 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1641 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1642 (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) &&
1643 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1644 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1646 * send multicast frames both to higher layers in
1647 * local net stack and back to the wireless medium
1649 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1650 if (!xmit_skb
&& net_ratelimit())
1651 printk(KERN_DEBUG
"%s: failed to clone "
1652 "multicast frame\n", dev
->name
);
1654 dsta
= sta_info_get(sdata
, skb
->data
);
1657 * The destination station is associated to
1658 * this AP (in this VLAN), so send the frame
1659 * directly to it and do not pass it to local
1669 int align __maybe_unused
;
1671 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1673 * 'align' will only take the values 0 or 2 here
1674 * since all frames are required to be aligned
1675 * to 2-byte boundaries when being passed to
1676 * mac80211. That also explains the __skb_push()
1679 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1681 if (WARN_ON(skb_headroom(skb
) < 3)) {
1685 u8
*data
= skb
->data
;
1686 size_t len
= skb_headlen(skb
);
1688 memmove(skb
->data
, data
, len
);
1689 skb_set_tail_pointer(skb
, len
);
1695 /* deliver to local stack */
1696 skb
->protocol
= eth_type_trans(skb
, dev
);
1697 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1698 netif_receive_skb(skb
);
1703 /* send to wireless media */
1704 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1705 skb_reset_network_header(xmit_skb
);
1706 skb_reset_mac_header(xmit_skb
);
1707 dev_queue_xmit(xmit_skb
);
1711 static ieee80211_rx_result debug_noinline
1712 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1714 struct net_device
*dev
= rx
->sdata
->dev
;
1715 struct sk_buff
*skb
= rx
->skb
;
1716 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1717 __le16 fc
= hdr
->frame_control
;
1718 struct sk_buff_head frame_list
;
1719 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1721 if (unlikely(!ieee80211_is_data(fc
)))
1724 if (unlikely(!ieee80211_is_data_present(fc
)))
1725 return RX_DROP_MONITOR
;
1727 if (!(status
->rx_flags
& IEEE80211_RX_AMSDU
))
1730 if (ieee80211_has_a4(hdr
->frame_control
) &&
1731 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1732 !rx
->sdata
->u
.vlan
.sta
)
1733 return RX_DROP_UNUSABLE
;
1735 if (is_multicast_ether_addr(hdr
->addr1
) &&
1736 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1737 rx
->sdata
->u
.vlan
.sta
) ||
1738 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1739 rx
->sdata
->u
.mgd
.use_4addr
)))
1740 return RX_DROP_UNUSABLE
;
1743 __skb_queue_head_init(&frame_list
);
1745 if (skb_linearize(skb
))
1746 return RX_DROP_UNUSABLE
;
1748 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1749 rx
->sdata
->vif
.type
,
1750 rx
->local
->hw
.extra_tx_headroom
);
1752 while (!skb_queue_empty(&frame_list
)) {
1753 rx
->skb
= __skb_dequeue(&frame_list
);
1755 if (!ieee80211_frame_allowed(rx
, fc
)) {
1756 dev_kfree_skb(rx
->skb
);
1759 dev
->stats
.rx_packets
++;
1760 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1762 ieee80211_deliver_skb(rx
);
1768 #ifdef CONFIG_MAC80211_MESH
1769 static ieee80211_rx_result
1770 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1772 struct ieee80211_hdr
*hdr
;
1773 struct ieee80211s_hdr
*mesh_hdr
;
1774 unsigned int hdrlen
;
1775 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1776 struct ieee80211_local
*local
= rx
->local
;
1777 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1778 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1780 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1781 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1782 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1784 if (!ieee80211_is_data(hdr
->frame_control
))
1789 return RX_DROP_MONITOR
;
1791 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1792 struct mesh_path
*mppath
;
1796 if (is_multicast_ether_addr(hdr
->addr1
)) {
1797 mpp_addr
= hdr
->addr3
;
1798 proxied_addr
= mesh_hdr
->eaddr1
;
1800 mpp_addr
= hdr
->addr4
;
1801 proxied_addr
= mesh_hdr
->eaddr2
;
1805 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1807 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1809 spin_lock_bh(&mppath
->state_lock
);
1810 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1811 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1812 spin_unlock_bh(&mppath
->state_lock
);
1817 /* Frame has reached destination. Don't forward */
1818 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1819 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1824 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
) {
1826 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1827 dropped_frames_ttl
);
1829 struct ieee80211_hdr
*fwd_hdr
;
1830 struct ieee80211_tx_info
*info
;
1832 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1834 if (!fwd_skb
&& net_ratelimit())
1835 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1838 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1839 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1840 info
= IEEE80211_SKB_CB(fwd_skb
);
1841 memset(info
, 0, sizeof(*info
));
1842 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1843 info
->control
.vif
= &rx
->sdata
->vif
;
1844 skb_set_queue_mapping(skb
,
1845 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1846 ieee80211_set_qos_hdr(local
, skb
);
1847 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1848 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1853 * Save TA to addr1 to send TA a path error if a
1854 * suitable next hop is not found
1856 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1858 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1859 /* Failed to immediately resolve next hop:
1860 * fwded frame was dropped or will be added
1861 * later to the pending skb queue. */
1863 return RX_DROP_MONITOR
;
1865 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1868 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1870 ieee80211_add_pending_skb(local
, fwd_skb
);
1874 if (is_multicast_ether_addr(hdr
->addr1
) ||
1875 sdata
->dev
->flags
& IFF_PROMISC
)
1878 return RX_DROP_MONITOR
;
1882 static ieee80211_rx_result debug_noinline
1883 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1885 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1886 struct ieee80211_local
*local
= rx
->local
;
1887 struct net_device
*dev
= sdata
->dev
;
1888 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1889 __le16 fc
= hdr
->frame_control
;
1892 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1895 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1896 return RX_DROP_MONITOR
;
1899 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1900 * that a 4-addr station can be detected and moved into a separate VLAN
1902 if (ieee80211_has_a4(hdr
->frame_control
) &&
1903 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1904 return RX_DROP_MONITOR
;
1906 err
= __ieee80211_data_to_8023(rx
);
1908 return RX_DROP_UNUSABLE
;
1910 if (!ieee80211_frame_allowed(rx
, fc
))
1911 return RX_DROP_MONITOR
;
1915 dev
->stats
.rx_packets
++;
1916 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1918 if (local
->ps_sdata
&& local
->hw
.conf
.dynamic_ps_timeout
> 0 &&
1919 !is_multicast_ether_addr(((struct ethhdr
*)rx
->skb
->data
)->h_dest
)) {
1920 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1921 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1924 ieee80211_deliver_skb(rx
);
1929 static ieee80211_rx_result debug_noinline
1930 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1932 struct ieee80211_local
*local
= rx
->local
;
1933 struct ieee80211_hw
*hw
= &local
->hw
;
1934 struct sk_buff
*skb
= rx
->skb
;
1935 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1936 struct tid_ampdu_rx
*tid_agg_rx
;
1940 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1943 if (ieee80211_is_back_req(bar
->frame_control
)) {
1945 __le16 control
, start_seq_num
;
1946 } __packed bar_data
;
1949 return RX_DROP_MONITOR
;
1951 if (skb_copy_bits(skb
, offsetof(struct ieee80211_bar
, control
),
1952 &bar_data
, sizeof(bar_data
)))
1953 return RX_DROP_MONITOR
;
1955 tid
= le16_to_cpu(bar_data
.control
) >> 12;
1957 tid_agg_rx
= rcu_dereference(rx
->sta
->ampdu_mlme
.tid_rx
[tid
]);
1959 return RX_DROP_MONITOR
;
1961 start_seq_num
= le16_to_cpu(bar_data
.start_seq_num
) >> 4;
1963 /* reset session timer */
1964 if (tid_agg_rx
->timeout
)
1965 mod_timer(&tid_agg_rx
->session_timer
,
1966 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1968 spin_lock(&tid_agg_rx
->reorder_lock
);
1969 /* release stored frames up to start of BAR */
1970 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1972 spin_unlock(&tid_agg_rx
->reorder_lock
);
1979 * After this point, we only want management frames,
1980 * so we can drop all remaining control frames to
1981 * cooked monitor interfaces.
1983 return RX_DROP_MONITOR
;
1986 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1987 struct ieee80211_mgmt
*mgmt
,
1990 struct ieee80211_local
*local
= sdata
->local
;
1991 struct sk_buff
*skb
;
1992 struct ieee80211_mgmt
*resp
;
1994 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1995 /* Not to own unicast address */
1999 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
2000 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
2001 /* Not from the current AP or not associated yet. */
2005 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
2006 /* Too short SA Query request frame */
2010 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
2014 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
2015 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
2016 memset(resp
, 0, 24);
2017 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
2018 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
2019 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
2020 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
2021 IEEE80211_STYPE_ACTION
);
2022 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
2023 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
2024 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
2025 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
2026 mgmt
->u
.action
.u
.sa_query
.trans_id
,
2027 WLAN_SA_QUERY_TR_ID_LEN
);
2029 ieee80211_tx_skb(sdata
, skb
);
2032 static ieee80211_rx_result debug_noinline
2033 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data
*rx
)
2035 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2036 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2039 * From here on, look only at management frames.
2040 * Data and control frames are already handled,
2041 * and unknown (reserved) frames are useless.
2043 if (rx
->skb
->len
< 24)
2044 return RX_DROP_MONITOR
;
2046 if (!ieee80211_is_mgmt(mgmt
->frame_control
))
2047 return RX_DROP_MONITOR
;
2049 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2050 return RX_DROP_MONITOR
;
2052 if (ieee80211_drop_unencrypted_mgmt(rx
))
2053 return RX_DROP_UNUSABLE
;
2058 static ieee80211_rx_result debug_noinline
2059 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
2061 struct ieee80211_local
*local
= rx
->local
;
2062 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2063 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2064 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2065 int len
= rx
->skb
->len
;
2067 if (!ieee80211_is_action(mgmt
->frame_control
))
2070 /* drop too small frames */
2071 if (len
< IEEE80211_MIN_ACTION_SIZE
)
2072 return RX_DROP_UNUSABLE
;
2074 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
2075 return RX_DROP_UNUSABLE
;
2077 if (!(status
->rx_flags
& IEEE80211_RX_RA_MATCH
))
2078 return RX_DROP_UNUSABLE
;
2080 switch (mgmt
->u
.action
.category
) {
2081 case WLAN_CATEGORY_BACK
:
2083 * The aggregation code is not prepared to handle
2084 * anything but STA/AP due to the BSSID handling;
2085 * IBSS could work in the code but isn't supported
2086 * by drivers or the standard.
2088 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
2089 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
2090 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
2093 /* verify action_code is present */
2094 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2097 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
2098 case WLAN_ACTION_ADDBA_REQ
:
2099 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2100 sizeof(mgmt
->u
.action
.u
.addba_req
)))
2103 case WLAN_ACTION_ADDBA_RESP
:
2104 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2105 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
2108 case WLAN_ACTION_DELBA
:
2109 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2110 sizeof(mgmt
->u
.action
.u
.delba
)))
2118 case WLAN_CATEGORY_SPECTRUM_MGMT
:
2119 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
2122 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2125 /* verify action_code is present */
2126 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
2129 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
2130 case WLAN_ACTION_SPCT_MSR_REQ
:
2131 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2132 sizeof(mgmt
->u
.action
.u
.measurement
)))
2134 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
2136 case WLAN_ACTION_SPCT_CHL_SWITCH
:
2137 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2138 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
2141 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2144 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2150 case WLAN_CATEGORY_SA_QUERY
:
2151 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2152 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2155 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2156 case WLAN_ACTION_SA_QUERY_REQUEST
:
2157 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2159 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2163 case WLAN_CATEGORY_MESH_PLINK
:
2164 if (!ieee80211_vif_is_mesh(&sdata
->vif
))
2167 case WLAN_CATEGORY_MESH_PATH_SEL
:
2168 if (!mesh_path_sel_is_hwmp(sdata
))
2176 status
->rx_flags
|= IEEE80211_RX_MALFORMED_ACTION_FRM
;
2177 /* will return in the next handlers */
2182 rx
->sta
->rx_packets
++;
2183 dev_kfree_skb(rx
->skb
);
2187 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2188 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2189 ieee80211_queue_work(&local
->hw
, &sdata
->work
);
2191 rx
->sta
->rx_packets
++;
2195 static ieee80211_rx_result debug_noinline
2196 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data
*rx
)
2198 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2200 /* skip known-bad action frames and return them in the next handler */
2201 if (status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
)
2205 * Getting here means the kernel doesn't know how to handle
2206 * it, but maybe userspace does ... include returned frames
2207 * so userspace can register for those to know whether ones
2208 * it transmitted were processed or returned.
2211 if (cfg80211_rx_mgmt(rx
->sdata
->dev
, status
->freq
,
2212 rx
->skb
->data
, rx
->skb
->len
,
2215 rx
->sta
->rx_packets
++;
2216 dev_kfree_skb(rx
->skb
);
2224 static ieee80211_rx_result debug_noinline
2225 ieee80211_rx_h_action_return(struct ieee80211_rx_data
*rx
)
2227 struct ieee80211_local
*local
= rx
->local
;
2228 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2229 struct sk_buff
*nskb
;
2230 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2231 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
2233 if (!ieee80211_is_action(mgmt
->frame_control
))
2237 * For AP mode, hostapd is responsible for handling any action
2238 * frames that we didn't handle, including returning unknown
2239 * ones. For all other modes we will return them to the sender,
2240 * setting the 0x80 bit in the action category, as required by
2241 * 802.11-2007 7.3.1.11.
2242 * Newer versions of hostapd shall also use the management frame
2243 * registration mechanisms, but older ones still use cooked
2244 * monitor interfaces so push all frames there.
2246 if (!(status
->rx_flags
& IEEE80211_RX_MALFORMED_ACTION_FRM
) &&
2247 (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2248 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
))
2249 return RX_DROP_MONITOR
;
2251 /* do not return rejected action frames */
2252 if (mgmt
->u
.action
.category
& 0x80)
2253 return RX_DROP_UNUSABLE
;
2255 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2258 struct ieee80211_mgmt
*nmgmt
= (void *)nskb
->data
;
2260 nmgmt
->u
.action
.category
|= 0x80;
2261 memcpy(nmgmt
->da
, nmgmt
->sa
, ETH_ALEN
);
2262 memcpy(nmgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2264 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2266 ieee80211_tx_skb(rx
->sdata
, nskb
);
2268 dev_kfree_skb(rx
->skb
);
2272 static ieee80211_rx_result debug_noinline
2273 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2275 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2276 ieee80211_rx_result rxs
;
2277 struct ieee80211_mgmt
*mgmt
= (void *)rx
->skb
->data
;
2280 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2281 if (rxs
!= RX_CONTINUE
)
2284 stype
= mgmt
->frame_control
& cpu_to_le16(IEEE80211_FCTL_STYPE
);
2286 if (!ieee80211_vif_is_mesh(&sdata
->vif
) &&
2287 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
2288 sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2289 return RX_DROP_MONITOR
;
2292 case cpu_to_le16(IEEE80211_STYPE_BEACON
):
2293 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP
):
2294 /* process for all: mesh, mlme, ibss */
2296 case cpu_to_le16(IEEE80211_STYPE_DEAUTH
):
2297 case cpu_to_le16(IEEE80211_STYPE_DISASSOC
):
2298 if (is_multicast_ether_addr(mgmt
->da
) &&
2299 !is_broadcast_ether_addr(mgmt
->da
))
2300 return RX_DROP_MONITOR
;
2302 /* process only for station */
2303 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2304 return RX_DROP_MONITOR
;
2306 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ
):
2307 case cpu_to_le16(IEEE80211_STYPE_AUTH
):
2308 /* process only for ibss */
2309 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
2310 return RX_DROP_MONITOR
;
2313 return RX_DROP_MONITOR
;
2316 /* queue up frame and kick off work to process it */
2317 rx
->skb
->pkt_type
= IEEE80211_SDATA_QUEUE_TYPE_FRAME
;
2318 skb_queue_tail(&sdata
->skb_queue
, rx
->skb
);
2319 ieee80211_queue_work(&rx
->local
->hw
, &sdata
->work
);
2321 rx
->sta
->rx_packets
++;
2326 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2327 struct ieee80211_rx_data
*rx
)
2330 unsigned int hdrlen
;
2332 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2333 if (rx
->skb
->len
>= hdrlen
+ 4)
2334 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2340 * Some hardware seem to generate incorrect Michael MIC
2341 * reports; ignore them to avoid triggering countermeasures.
2346 if (!ieee80211_has_protected(hdr
->frame_control
))
2349 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2351 * APs with pairwise keys should never receive Michael MIC
2352 * errors for non-zero keyidx because these are reserved for
2353 * group keys and only the AP is sending real multicast
2354 * frames in the BSS.
2359 if (!ieee80211_is_data(hdr
->frame_control
) &&
2360 !ieee80211_is_auth(hdr
->frame_control
))
2363 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2367 /* TODO: use IEEE80211_RX_FRAGMENTED */
2368 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2369 struct ieee80211_rate
*rate
)
2371 struct ieee80211_sub_if_data
*sdata
;
2372 struct ieee80211_local
*local
= rx
->local
;
2373 struct ieee80211_rtap_hdr
{
2374 struct ieee80211_radiotap_header hdr
;
2380 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2381 struct net_device
*prev_dev
= NULL
;
2382 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2385 * If cooked monitor has been processed already, then
2386 * don't do it again. If not, set the flag.
2388 if (rx
->flags
& IEEE80211_RX_CMNTR
)
2390 rx
->flags
|= IEEE80211_RX_CMNTR
;
2392 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2393 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2396 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2397 memset(rthdr
, 0, sizeof(*rthdr
));
2398 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2399 rthdr
->hdr
.it_present
=
2400 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2401 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2404 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2405 rthdr
->hdr
.it_present
|=
2406 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2408 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2410 if (status
->band
== IEEE80211_BAND_5GHZ
)
2411 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2412 IEEE80211_CHAN_5GHZ
);
2414 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2415 IEEE80211_CHAN_2GHZ
);
2417 skb_set_mac_header(skb
, 0);
2418 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2419 skb
->pkt_type
= PACKET_OTHERHOST
;
2420 skb
->protocol
= htons(ETH_P_802_2
);
2422 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2423 if (!ieee80211_sdata_running(sdata
))
2426 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2427 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2431 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2433 skb2
->dev
= prev_dev
;
2434 netif_receive_skb(skb2
);
2438 prev_dev
= sdata
->dev
;
2439 sdata
->dev
->stats
.rx_packets
++;
2440 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2444 skb
->dev
= prev_dev
;
2445 netif_receive_skb(skb
);
2453 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data
*rx
,
2454 ieee80211_rx_result res
)
2457 case RX_DROP_MONITOR
:
2458 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2460 rx
->sta
->rx_dropped
++;
2463 struct ieee80211_rate
*rate
= NULL
;
2464 struct ieee80211_supported_band
*sband
;
2465 struct ieee80211_rx_status
*status
;
2467 status
= IEEE80211_SKB_RXCB((rx
->skb
));
2469 sband
= rx
->local
->hw
.wiphy
->bands
[status
->band
];
2470 if (!(status
->flag
& RX_FLAG_HT
))
2471 rate
= &sband
->bitrates
[status
->rate_idx
];
2473 ieee80211_rx_cooked_monitor(rx
, rate
);
2476 case RX_DROP_UNUSABLE
:
2477 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_drop
);
2479 rx
->sta
->rx_dropped
++;
2480 dev_kfree_skb(rx
->skb
);
2483 I802_DEBUG_INC(rx
->sdata
->local
->rx_handlers_queued
);
2488 static void ieee80211_rx_handlers(struct ieee80211_rx_data
*rx
,
2489 struct sk_buff_head
*frames
)
2491 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2492 struct sk_buff
*skb
;
2494 #define CALL_RXH(rxh) \
2497 if (res != RX_CONTINUE) \
2501 while ((skb
= __skb_dequeue(frames
))) {
2503 * all the other fields are valid across frames
2504 * that belong to an aMPDU since they are on the
2505 * same TID from the same station
2510 CALL_RXH(ieee80211_rx_h_decrypt
)
2511 CALL_RXH(ieee80211_rx_h_check_more_data
)
2512 CALL_RXH(ieee80211_rx_h_sta_process
)
2513 CALL_RXH(ieee80211_rx_h_defragment
)
2514 CALL_RXH(ieee80211_rx_h_ps_poll
)
2515 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2516 /* must be after MMIC verify so header is counted in MPDU mic */
2517 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2518 CALL_RXH(ieee80211_rx_h_amsdu
)
2519 #ifdef CONFIG_MAC80211_MESH
2520 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
2521 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2523 CALL_RXH(ieee80211_rx_h_data
)
2525 /* special treatment -- needs the queue */
2526 res
= ieee80211_rx_h_ctrl(rx
, frames
);
2527 if (res
!= RX_CONTINUE
)
2530 CALL_RXH(ieee80211_rx_h_mgmt_check
)
2531 CALL_RXH(ieee80211_rx_h_action
)
2532 CALL_RXH(ieee80211_rx_h_userspace_mgmt
)
2533 CALL_RXH(ieee80211_rx_h_action_return
)
2534 CALL_RXH(ieee80211_rx_h_mgmt
)
2537 ieee80211_rx_handlers_result(rx
, res
);
2543 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data
*rx
)
2545 struct sk_buff_head reorder_release
;
2546 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2548 __skb_queue_head_init(&reorder_release
);
2550 #define CALL_RXH(rxh) \
2553 if (res != RX_CONTINUE) \
2557 CALL_RXH(ieee80211_rx_h_passive_scan
)
2558 CALL_RXH(ieee80211_rx_h_check
)
2560 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2562 ieee80211_rx_handlers(rx
, &reorder_release
);
2566 ieee80211_rx_handlers_result(rx
, res
);
2572 * This function makes calls into the RX path, therefore
2573 * it has to be invoked under RCU read lock.
2575 void ieee80211_release_reorder_timeout(struct sta_info
*sta
, int tid
)
2577 struct sk_buff_head frames
;
2578 struct ieee80211_rx_data rx
= {
2580 .sdata
= sta
->sdata
,
2581 .local
= sta
->local
,
2584 struct tid_ampdu_rx
*tid_agg_rx
;
2586 tid_agg_rx
= rcu_dereference(sta
->ampdu_mlme
.tid_rx
[tid
]);
2590 __skb_queue_head_init(&frames
);
2592 spin_lock(&tid_agg_rx
->reorder_lock
);
2593 ieee80211_sta_reorder_release(&sta
->local
->hw
, tid_agg_rx
, &frames
);
2594 spin_unlock(&tid_agg_rx
->reorder_lock
);
2596 ieee80211_rx_handlers(&rx
, &frames
);
2599 /* main receive path */
2601 static int prepare_for_handlers(struct ieee80211_rx_data
*rx
,
2602 struct ieee80211_hdr
*hdr
)
2604 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2605 struct sk_buff
*skb
= rx
->skb
;
2606 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2607 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2608 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2610 switch (sdata
->vif
.type
) {
2611 case NL80211_IFTYPE_STATION
:
2612 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2615 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2616 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2618 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2621 case NL80211_IFTYPE_ADHOC
:
2624 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2627 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2628 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2630 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2631 } else if (!multicast
&&
2632 compare_ether_addr(sdata
->vif
.addr
,
2634 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2636 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2637 } else if (!rx
->sta
) {
2639 if (status
->flag
& RX_FLAG_HT
)
2640 rate_idx
= 0; /* TODO: HT rates */
2642 rate_idx
= status
->rate_idx
;
2643 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2644 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2647 case NL80211_IFTYPE_MESH_POINT
:
2649 compare_ether_addr(sdata
->vif
.addr
,
2651 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2654 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2657 case NL80211_IFTYPE_AP_VLAN
:
2658 case NL80211_IFTYPE_AP
:
2660 if (compare_ether_addr(sdata
->vif
.addr
,
2663 } else if (!ieee80211_bssid_match(bssid
,
2665 if (!(status
->rx_flags
& IEEE80211_RX_IN_SCAN
))
2667 status
->rx_flags
&= ~IEEE80211_RX_RA_MATCH
;
2670 case NL80211_IFTYPE_WDS
:
2671 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2673 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2677 /* should never get here */
2686 * This function returns whether or not the SKB
2687 * was destined for RX processing or not, which,
2688 * if consume is true, is equivalent to whether
2689 * or not the skb was consumed.
2691 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data
*rx
,
2692 struct sk_buff
*skb
, bool consume
)
2694 struct ieee80211_local
*local
= rx
->local
;
2695 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2696 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2697 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
2701 status
->rx_flags
|= IEEE80211_RX_RA_MATCH
;
2702 prepares
= prepare_for_handlers(rx
, hdr
);
2707 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2708 if (status
->rx_flags
& IEEE80211_RX_RA_MATCH
)
2709 ieee80211_rx_michael_mic_report(hdr
, rx
);
2714 skb
= skb_copy(skb
, GFP_ATOMIC
);
2716 if (net_ratelimit())
2717 wiphy_debug(local
->hw
.wiphy
,
2718 "failed to copy multicast frame for %s\n",
2726 ieee80211_invoke_rx_handlers(rx
);
2731 * This is the actual Rx frames handler. as it blongs to Rx path it must
2732 * be called with rcu_read_lock protection.
2734 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2735 struct sk_buff
*skb
)
2737 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2738 struct ieee80211_local
*local
= hw_to_local(hw
);
2739 struct ieee80211_sub_if_data
*sdata
;
2740 struct ieee80211_hdr
*hdr
;
2742 struct ieee80211_rx_data rx
;
2743 struct ieee80211_sub_if_data
*prev
;
2744 struct sta_info
*sta
, *tmp
, *prev_sta
;
2747 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2748 memset(&rx
, 0, sizeof(rx
));
2752 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2753 local
->dot11ReceivedFragmentCount
++;
2755 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2756 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2757 status
->rx_flags
|= IEEE80211_RX_IN_SCAN
;
2759 if (ieee80211_is_mgmt(fc
))
2760 err
= skb_linearize(skb
);
2762 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2769 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2770 ieee80211_parse_qos(&rx
);
2771 ieee80211_verify_alignment(&rx
);
2773 if (ieee80211_is_data(fc
)) {
2776 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2783 rx
.sdata
= prev_sta
->sdata
;
2784 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2791 rx
.sdata
= prev_sta
->sdata
;
2793 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2801 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2802 if (!ieee80211_sdata_running(sdata
))
2805 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2806 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2810 * frame is destined for this interface, but if it's
2811 * not also for the previous one we handle that after
2812 * the loop to avoid copying the SKB once too much
2820 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2822 ieee80211_prepare_and_rx_handle(&rx
, skb
, false);
2828 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2831 if (ieee80211_prepare_and_rx_handle(&rx
, skb
, true))
2840 * This is the receive path handler. It is called by a low level driver when an
2841 * 802.11 MPDU is received from the hardware.
2843 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2845 struct ieee80211_local
*local
= hw_to_local(hw
);
2846 struct ieee80211_rate
*rate
= NULL
;
2847 struct ieee80211_supported_band
*sband
;
2848 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2850 WARN_ON_ONCE(softirq_count() == 0);
2852 if (WARN_ON(status
->band
< 0 ||
2853 status
->band
>= IEEE80211_NUM_BANDS
))
2856 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2857 if (WARN_ON(!sband
))
2861 * If we're suspending, it is possible although not too likely
2862 * that we'd be receiving frames after having already partially
2863 * quiesced the stack. We can't process such frames then since
2864 * that might, for example, cause stations to be added or other
2865 * driver callbacks be invoked.
2867 if (unlikely(local
->quiescing
|| local
->suspended
))
2871 * The same happens when we're not even started,
2872 * but that's worth a warning.
2874 if (WARN_ON(!local
->started
))
2877 if (likely(!(status
->flag
& RX_FLAG_FAILED_PLCP_CRC
))) {
2879 * Validate the rate, unless a PLCP error means that
2880 * we probably can't have a valid rate here anyway.
2883 if (status
->flag
& RX_FLAG_HT
) {
2885 * rate_idx is MCS index, which can be [0-76]
2888 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2890 * Anything else would be some sort of driver or
2891 * hardware error. The driver should catch hardware
2894 if (WARN((status
->rate_idx
< 0 ||
2895 status
->rate_idx
> 76),
2896 "Rate marked as an HT rate but passed "
2897 "status->rate_idx is not "
2898 "an MCS index [0-76]: %d (0x%02x)\n",
2903 if (WARN_ON(status
->rate_idx
< 0 ||
2904 status
->rate_idx
>= sband
->n_bitrates
))
2906 rate
= &sband
->bitrates
[status
->rate_idx
];
2910 status
->rx_flags
= 0;
2913 * key references and virtual interfaces are protected using RCU
2914 * and this requires that we are in a read-side RCU section during
2915 * receive processing
2920 * Frames with failed FCS/PLCP checksum are not returned,
2921 * all other frames are returned without radiotap header
2922 * if it was previously present.
2923 * Also, frames with less than 16 bytes are dropped.
2925 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2931 __ieee80211_rx_handle_packet(hw
, skb
);
2939 EXPORT_SYMBOL(ieee80211_rx
);
2941 /* This is a version of the rx handler that can be called from hard irq
2942 * context. Post the skb on the queue and schedule the tasklet */
2943 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2945 struct ieee80211_local
*local
= hw_to_local(hw
);
2947 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2949 skb
->pkt_type
= IEEE80211_RX_MSG
;
2950 skb_queue_tail(&local
->skb_queue
, skb
);
2951 tasklet_schedule(&local
->tasklet
);
2953 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);