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/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
31 * monitor mode reception
33 * This function cleans up the SKB, i.e. it removes all the stuff
34 * only useful for monitoring.
36 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
39 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
40 if (likely(skb
->len
> FCS_LEN
))
41 skb_trim(skb
, skb
->len
- FCS_LEN
);
53 static inline int should_drop_frame(struct sk_buff
*skb
,
56 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
57 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
59 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
61 if (unlikely(skb
->len
< 16 + present_fcs_len
))
63 if (ieee80211_is_ctl(hdr
->frame_control
) &&
64 !ieee80211_is_pspoll(hdr
->frame_control
) &&
65 !ieee80211_is_back_req(hdr
->frame_control
))
71 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
72 struct ieee80211_rx_status
*status
)
76 /* always present fields */
77 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
79 if (status
->flag
& RX_FLAG_TSFT
)
81 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
83 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
86 if (len
& 1) /* padding for RX_FLAGS if necessary */
93 * ieee80211_add_rx_radiotap_header - add radiotap header
95 * add a radiotap header containing all the fields which the hardware provided.
98 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
100 struct ieee80211_rate
*rate
,
103 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
104 struct ieee80211_radiotap_header
*rthdr
;
108 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
109 memset(rthdr
, 0, rtap_len
);
111 /* radiotap header, set always present flags */
113 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
114 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
115 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
116 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
117 rthdr
->it_len
= cpu_to_le16(rtap_len
);
119 pos
= (unsigned char *)(rthdr
+1);
121 /* the order of the following fields is important */
123 /* IEEE80211_RADIOTAP_TSFT */
124 if (status
->flag
& RX_FLAG_TSFT
) {
125 put_unaligned_le64(status
->mactime
, pos
);
127 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
131 /* IEEE80211_RADIOTAP_FLAGS */
132 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
133 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
134 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
135 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
136 if (status
->flag
& RX_FLAG_SHORTPRE
)
137 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
140 /* IEEE80211_RADIOTAP_RATE */
141 if (status
->flag
& RX_FLAG_HT
) {
143 * TODO: add following information into radiotap header once
144 * suitable fields are defined for it:
145 * - MCS index (status->rate_idx)
146 * - HT40 (status->flag & RX_FLAG_40MHZ)
147 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
151 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
152 *pos
= rate
->bitrate
/ 5;
156 /* IEEE80211_RADIOTAP_CHANNEL */
157 put_unaligned_le16(status
->freq
, pos
);
159 if (status
->band
== IEEE80211_BAND_5GHZ
)
160 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
162 else if (status
->flag
& RX_FLAG_HT
)
163 put_unaligned_le16(IEEE80211_CHAN_DYN
| IEEE80211_CHAN_2GHZ
,
165 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
166 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
169 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
175 *pos
= status
->signal
;
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
181 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
182 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
183 *pos
= status
->noise
;
185 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
189 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
191 /* IEEE80211_RADIOTAP_ANTENNA */
192 *pos
= status
->antenna
;
195 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197 /* IEEE80211_RADIOTAP_RX_FLAGS */
198 /* ensure 2 byte alignment for the 2 byte field as required */
199 if ((pos
- (u8
*)rthdr
) & 1)
201 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
202 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
203 put_unaligned_le16(rx_flags
, pos
);
208 * This function copies a received frame to all monitor interfaces and
209 * returns a cleaned-up SKB that no longer includes the FCS nor the
210 * radiotap header the driver might have added.
212 static struct sk_buff
*
213 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
214 struct ieee80211_rate
*rate
)
216 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
217 struct ieee80211_sub_if_data
*sdata
;
218 int needed_headroom
= 0;
219 struct sk_buff
*skb
, *skb2
;
220 struct net_device
*prev_dev
= NULL
;
221 int present_fcs_len
= 0;
224 * First, we may need to make a copy of the skb because
225 * (1) we need to modify it for radiotap (if not present), and
226 * (2) the other RX handlers will modify the skb we got.
228 * We don't need to, of course, if we aren't going to return
229 * the SKB because it has a bad FCS/PLCP checksum.
232 /* room for the radiotap header based on driver features */
233 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
235 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
236 present_fcs_len
= FCS_LEN
;
238 if (!local
->monitors
) {
239 if (should_drop_frame(origskb
, present_fcs_len
)) {
240 dev_kfree_skb(origskb
);
244 return remove_monitor_info(local
, origskb
);
247 if (should_drop_frame(origskb
, present_fcs_len
)) {
248 /* only need to expand headroom if necessary */
253 * This shouldn't trigger often because most devices have an
254 * RX header they pull before we get here, and that should
255 * be big enough for our radiotap information. We should
256 * probably export the length to drivers so that we can have
257 * them allocate enough headroom to start with.
259 if (skb_headroom(skb
) < needed_headroom
&&
260 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
266 * Need to make a copy and possibly remove radiotap header
267 * and FCS from the original.
269 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
271 origskb
= remove_monitor_info(local
, origskb
);
277 /* prepend radiotap information */
278 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
280 skb_reset_mac_header(skb
);
281 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
282 skb
->pkt_type
= PACKET_OTHERHOST
;
283 skb
->protocol
= htons(ETH_P_802_2
);
285 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
286 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
289 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
292 if (!ieee80211_sdata_running(sdata
))
296 skb2
= skb_clone(skb
, GFP_ATOMIC
);
298 skb2
->dev
= prev_dev
;
303 prev_dev
= sdata
->dev
;
304 sdata
->dev
->stats
.rx_packets
++;
305 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
318 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
320 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
323 /* does the frame have a qos control field? */
324 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
325 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
326 /* frame has qos control */
327 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
328 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
329 rx
->flags
|= IEEE80211_RX_AMSDU
;
331 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
334 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
336 * Sequence numbers for management frames, QoS data
337 * frames with a broadcast/multicast address in the
338 * Address 1 field, and all non-QoS data frames sent
339 * by QoS STAs are assigned using an additional single
340 * modulo-4096 counter, [...]
342 * We also use that counter for non-QoS STAs.
344 tid
= NUM_RX_DATA_QUEUES
- 1;
348 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
349 * For now, set skb->priority to 0 for other cases. */
350 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
354 * DOC: Packet alignment
356 * Drivers always need to pass packets that are aligned to two-byte boundaries
359 * Additionally, should, if possible, align the payload data in a way that
360 * guarantees that the contained IP header is aligned to a four-byte
361 * boundary. In the case of regular frames, this simply means aligning the
362 * payload to a four-byte boundary (because either the IP header is directly
363 * contained, or IV/RFC1042 headers that have a length divisible by four are
364 * in front of it). If the payload data is not properly aligned and the
365 * architecture doesn't support efficient unaligned operations, mac80211
366 * will align the data.
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
378 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
380 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
381 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
382 "unaligned packet at 0x%p\n", rx
->skb
->data
);
389 static ieee80211_rx_result debug_noinline
390 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
392 struct ieee80211_local
*local
= rx
->local
;
393 struct sk_buff
*skb
= rx
->skb
;
395 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
396 return ieee80211_scan_rx(rx
->sdata
, skb
);
398 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
399 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
400 /* drop all the other packets during a software scan anyway */
401 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
406 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
407 /* scanning finished during invoking of handlers */
408 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
409 return RX_DROP_UNUSABLE
;
416 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
418 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
420 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
423 return ieee80211_is_robust_mgmt_frame(hdr
);
427 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
429 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
431 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
434 return ieee80211_is_robust_mgmt_frame(hdr
);
438 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
439 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
441 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
442 struct ieee80211_mmie
*mmie
;
444 if (skb
->len
< 24 + sizeof(*mmie
) ||
445 !is_multicast_ether_addr(hdr
->da
))
448 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
449 return -1; /* not a robust management frame */
451 mmie
= (struct ieee80211_mmie
*)
452 (skb
->data
+ skb
->len
- sizeof(*mmie
));
453 if (mmie
->element_id
!= WLAN_EID_MMIE
||
454 mmie
->length
!= sizeof(*mmie
) - 2)
457 return le16_to_cpu(mmie
->key_id
);
461 static ieee80211_rx_result
462 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
464 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
465 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
466 char *dev_addr
= rx
->sdata
->vif
.addr
;
468 if (ieee80211_is_data(hdr
->frame_control
)) {
469 if (is_multicast_ether_addr(hdr
->addr1
)) {
470 if (ieee80211_has_tods(hdr
->frame_control
) ||
471 !ieee80211_has_fromds(hdr
->frame_control
))
472 return RX_DROP_MONITOR
;
473 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
474 return RX_DROP_MONITOR
;
476 if (!ieee80211_has_a4(hdr
->frame_control
))
477 return RX_DROP_MONITOR
;
478 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
479 return RX_DROP_MONITOR
;
483 /* If there is not an established peer link and this is not a peer link
484 * establisment frame, beacon or probe, drop the frame.
487 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
488 struct ieee80211_mgmt
*mgmt
;
490 if (!ieee80211_is_mgmt(hdr
->frame_control
))
491 return RX_DROP_MONITOR
;
493 if (ieee80211_is_action(hdr
->frame_control
)) {
494 mgmt
= (struct ieee80211_mgmt
*)hdr
;
495 if (mgmt
->u
.action
.category
!= MESH_PLINK_CATEGORY
)
496 return RX_DROP_MONITOR
;
500 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
501 ieee80211_is_probe_resp(hdr
->frame_control
) ||
502 ieee80211_is_beacon(hdr
->frame_control
))
505 return RX_DROP_MONITOR
;
509 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
511 if (ieee80211_is_data(hdr
->frame_control
) &&
512 is_multicast_ether_addr(hdr
->addr1
) &&
513 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
514 return RX_DROP_MONITOR
;
520 #define SEQ_MODULO 0x1000
521 #define SEQ_MASK 0xfff
523 static inline int seq_less(u16 sq1
, u16 sq2
)
525 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
528 static inline u16
seq_inc(u16 sq
)
530 return (sq
+ 1) & SEQ_MASK
;
533 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
535 return (sq1
- sq2
) & SEQ_MASK
;
539 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
540 struct tid_ampdu_rx
*tid_agg_rx
,
542 struct sk_buff_head
*frames
)
544 struct ieee80211_supported_band
*sband
;
545 struct ieee80211_rate
*rate
= NULL
;
546 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
547 struct ieee80211_rx_status
*status
;
552 status
= IEEE80211_SKB_RXCB(skb
);
554 /* release the reordered frames to stack */
555 sband
= hw
->wiphy
->bands
[status
->band
];
556 if (!(status
->flag
& RX_FLAG_HT
))
557 rate
= &sband
->bitrates
[status
->rate_idx
];
558 tid_agg_rx
->stored_mpdu_num
--;
559 tid_agg_rx
->reorder_buf
[index
] = NULL
;
560 __skb_queue_tail(frames
, skb
);
563 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
566 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
567 struct tid_ampdu_rx
*tid_agg_rx
,
569 struct sk_buff_head
*frames
)
573 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
574 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
575 tid_agg_rx
->buf_size
;
576 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
581 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
582 * the skb was added to the buffer longer than this time ago, the earlier
583 * frames that have not yet been received are assumed to be lost and the skb
584 * can be released for processing. This may also release other skb's from the
585 * reorder buffer if there are no additional gaps between the frames.
587 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
590 * As this function belongs to the RX path it must be under
591 * rcu_read_lock protection. It returns false if the frame
592 * can be processed immediately, true if it was consumed.
594 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
595 struct tid_ampdu_rx
*tid_agg_rx
,
597 struct sk_buff_head
*frames
)
599 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
600 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
601 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
602 u16 head_seq_num
, buf_size
;
605 buf_size
= tid_agg_rx
->buf_size
;
606 head_seq_num
= tid_agg_rx
->head_seq_num
;
608 /* frame with out of date sequence number */
609 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
615 * If frame the sequence number exceeds our buffering window
616 * size release some previous frames to make room for this one.
618 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
619 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
620 /* release stored frames up to new head to stack */
621 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
625 /* Now the new frame is always in the range of the reordering buffer */
627 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
629 /* check if we already stored this frame */
630 if (tid_agg_rx
->reorder_buf
[index
]) {
636 * If the current MPDU is in the right order and nothing else
637 * is stored we can process it directly, no need to buffer it.
639 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
640 tid_agg_rx
->stored_mpdu_num
== 0) {
641 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
645 /* put the frame in the reordering buffer */
646 tid_agg_rx
->reorder_buf
[index
] = skb
;
647 tid_agg_rx
->reorder_time
[index
] = jiffies
;
648 tid_agg_rx
->stored_mpdu_num
++;
649 /* release the buffer until next missing frame */
650 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
651 tid_agg_rx
->buf_size
;
652 if (!tid_agg_rx
->reorder_buf
[index
] &&
653 tid_agg_rx
->stored_mpdu_num
> 1) {
655 * No buffers ready to be released, but check whether any
656 * frames in the reorder buffer have timed out.
660 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
661 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
662 if (!tid_agg_rx
->reorder_buf
[j
]) {
666 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
667 HT_RX_REORDER_BUF_TIMEOUT
))
670 #ifdef CONFIG_MAC80211_HT_DEBUG
672 printk(KERN_DEBUG
"%s: release an RX reorder "
673 "frame due to timeout on earlier "
675 wiphy_name(hw
->wiphy
));
677 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
681 * Increment the head seq# also for the skipped slots.
683 tid_agg_rx
->head_seq_num
=
684 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
687 } else while (tid_agg_rx
->reorder_buf
[index
]) {
688 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
689 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
690 tid_agg_rx
->buf_size
;
697 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
698 * true if the MPDU was buffered, false if it should be processed.
700 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
701 struct sk_buff_head
*frames
)
703 struct sk_buff
*skb
= rx
->skb
;
704 struct ieee80211_local
*local
= rx
->local
;
705 struct ieee80211_hw
*hw
= &local
->hw
;
706 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
707 struct sta_info
*sta
= rx
->sta
;
708 struct tid_ampdu_rx
*tid_agg_rx
;
712 if (!ieee80211_is_data_qos(hdr
->frame_control
))
716 * filter the QoS data rx stream according to
717 * STA/TID and check if this STA/TID is on aggregation
723 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
725 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
728 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
730 /* qos null data frames are excluded */
731 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
734 /* new, potentially un-ordered, ampdu frame - process it */
736 /* reset session timer */
737 if (tid_agg_rx
->timeout
)
738 mod_timer(&tid_agg_rx
->session_timer
,
739 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
741 /* if this mpdu is fragmented - terminate rx aggregation session */
742 sc
= le16_to_cpu(hdr
->seq_ctrl
);
743 if (sc
& IEEE80211_SCTL_FRAG
) {
744 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
745 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
750 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
))
754 __skb_queue_tail(frames
, skb
);
757 static ieee80211_rx_result debug_noinline
758 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
760 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
762 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
763 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
764 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
765 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
767 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
768 rx
->local
->dot11FrameDuplicateCount
++;
769 rx
->sta
->num_duplicates
++;
771 return RX_DROP_MONITOR
;
773 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
776 if (unlikely(rx
->skb
->len
< 16)) {
777 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
778 return RX_DROP_MONITOR
;
781 /* Drop disallowed frame classes based on STA auth/assoc state;
782 * IEEE 802.11, Chap 5.5.
784 * mac80211 filters only based on association state, i.e. it drops
785 * Class 3 frames from not associated stations. hostapd sends
786 * deauth/disassoc frames when needed. In addition, hostapd is
787 * responsible for filtering on both auth and assoc states.
790 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
791 return ieee80211_rx_mesh_check(rx
);
793 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
794 ieee80211_is_pspoll(hdr
->frame_control
)) &&
795 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
796 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
797 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
798 !ieee80211_has_tods(hdr
->frame_control
) &&
799 ieee80211_is_data(hdr
->frame_control
)) ||
800 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
801 /* Drop IBSS frames and frames for other hosts
803 return RX_DROP_MONITOR
;
806 return RX_DROP_MONITOR
;
813 static ieee80211_rx_result debug_noinline
814 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
816 struct sk_buff
*skb
= rx
->skb
;
817 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
818 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
821 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
822 struct ieee80211_key
*stakey
= NULL
;
823 int mmie_keyidx
= -1;
828 * There are four types of keys:
830 * - IGTK (group keys for management frames)
831 * - PTK (pairwise keys)
832 * - STK (station-to-station pairwise keys)
834 * When selecting a key, we have to distinguish between multicast
835 * (including broadcast) and unicast frames, the latter can only
836 * use PTKs and STKs while the former always use GTKs and IGTKs.
837 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
838 * unicast frames can also use key indices like GTKs. Hence, if we
839 * don't have a PTK/STK we check the key index for a WEP key.
841 * Note that in a regular BSS, multicast frames are sent by the
842 * AP only, associated stations unicast the frame to the AP first
843 * which then multicasts it on their behalf.
845 * There is also a slight problem in IBSS mode: GTKs are negotiated
846 * with each station, that is something we don't currently handle.
847 * The spec seems to expect that one negotiates the same key with
848 * every station but there's no such requirement; VLANs could be
853 * No point in finding a key and decrypting if the frame is neither
854 * addressed to us nor a multicast frame.
856 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
859 /* start without a key */
863 stakey
= rcu_dereference(rx
->sta
->key
);
865 if (!ieee80211_has_protected(hdr
->frame_control
))
866 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
868 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
870 /* Skip decryption if the frame is not protected. */
871 if (!ieee80211_has_protected(hdr
->frame_control
))
873 } else if (mmie_keyidx
>= 0) {
874 /* Broadcast/multicast robust management frame / BIP */
875 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
876 (status
->flag
& RX_FLAG_IV_STRIPPED
))
879 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
880 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
881 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
882 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
883 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
885 * The frame was not protected, so skip decryption. However, we
886 * need to set rx->key if there is a key that could have been
887 * used so that the frame may be dropped if encryption would
888 * have been expected.
890 struct ieee80211_key
*key
= NULL
;
891 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
892 is_multicast_ether_addr(hdr
->addr1
) &&
893 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
895 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
900 * The device doesn't give us the IV so we won't be
901 * able to look up the key. That's ok though, we
902 * don't need to decrypt the frame, we just won't
903 * be able to keep statistics accurate.
904 * Except for key threshold notifications, should
905 * we somehow allow the driver to tell us which key
906 * the hardware used if this flag is set?
908 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
909 (status
->flag
& RX_FLAG_IV_STRIPPED
))
912 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
914 if (rx
->skb
->len
< 8 + hdrlen
)
915 return RX_DROP_UNUSABLE
; /* TODO: count this? */
918 * no need to call ieee80211_wep_get_keyidx,
919 * it verifies a bunch of things we've done already
921 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
923 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
926 * RSNA-protected unicast frames should always be sent with
927 * pairwise or station-to-station keys, but for WEP we allow
928 * using a key index as well.
930 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
931 !is_multicast_ether_addr(hdr
->addr1
))
936 rx
->key
->tx_rx_count
++;
937 /* TODO: add threshold stuff again */
939 return RX_DROP_MONITOR
;
942 /* Check for weak IVs if possible */
943 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
944 ieee80211_is_data(hdr
->frame_control
) &&
945 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
946 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
947 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
948 rx
->sta
->wep_weak_iv_count
++;
950 switch (rx
->key
->conf
.alg
) {
952 result
= ieee80211_crypto_wep_decrypt(rx
);
955 result
= ieee80211_crypto_tkip_decrypt(rx
);
958 result
= ieee80211_crypto_ccmp_decrypt(rx
);
961 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
965 /* either the frame has been decrypted or will be dropped */
966 status
->flag
|= RX_FLAG_DECRYPTED
;
971 static ieee80211_rx_result debug_noinline
972 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
974 struct ieee80211_local
*local
;
975 struct ieee80211_hdr
*hdr
;
980 hdr
= (struct ieee80211_hdr
*) skb
->data
;
982 if (!local
->pspolling
)
985 if (!ieee80211_has_fromds(hdr
->frame_control
))
986 /* this is not from AP */
989 if (!ieee80211_is_data(hdr
->frame_control
))
992 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
993 /* AP has no more frames buffered for us */
994 local
->pspolling
= false;
998 /* more data bit is set, let's request a new frame from the AP */
999 ieee80211_send_pspoll(local
, rx
->sdata
);
1004 static void ap_sta_ps_start(struct sta_info
*sta
)
1006 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1007 struct ieee80211_local
*local
= sdata
->local
;
1009 atomic_inc(&sdata
->bss
->num_sta_ps
);
1010 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1011 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1012 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1013 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1014 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1015 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1018 static void ap_sta_ps_end(struct sta_info
*sta
)
1020 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1022 atomic_dec(&sdata
->bss
->num_sta_ps
);
1024 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
1026 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1027 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1028 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1029 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1031 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1032 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1033 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1034 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1035 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1039 ieee80211_sta_ps_deliver_wakeup(sta
);
1042 static ieee80211_rx_result debug_noinline
1043 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1045 struct sta_info
*sta
= rx
->sta
;
1046 struct sk_buff
*skb
= rx
->skb
;
1047 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1048 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1054 * Update last_rx only for IBSS packets which are for the current
1055 * BSSID to avoid keeping the current IBSS network alive in cases
1056 * where other STAs start using different BSSID.
1058 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1059 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1060 NL80211_IFTYPE_ADHOC
);
1061 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1062 sta
->last_rx
= jiffies
;
1063 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1065 * Mesh beacons will update last_rx when if they are found to
1066 * match the current local configuration when processed.
1068 sta
->last_rx
= jiffies
;
1071 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1074 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1075 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1077 sta
->rx_fragments
++;
1078 sta
->rx_bytes
+= rx
->skb
->len
;
1079 sta
->last_signal
= status
->signal
;
1080 sta
->last_noise
= status
->noise
;
1083 * Change STA power saving mode only at the end of a frame
1084 * exchange sequence.
1086 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1087 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1088 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1089 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1091 * Ignore doze->wake transitions that are
1092 * indicated by non-data frames, the standard
1093 * is unclear here, but for example going to
1094 * PS mode and then scanning would cause a
1095 * doze->wake transition for the probe request,
1096 * and that is clearly undesirable.
1098 if (ieee80211_is_data(hdr
->frame_control
) &&
1099 !ieee80211_has_pm(hdr
->frame_control
))
1102 if (ieee80211_has_pm(hdr
->frame_control
))
1103 ap_sta_ps_start(sta
);
1108 * Drop (qos-)data::nullfunc frames silently, since they
1109 * are used only to control station power saving mode.
1111 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1112 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1113 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1116 * If we receive a 4-addr nullfunc frame from a STA
1117 * that was not moved to a 4-addr STA vlan yet, drop
1118 * the frame to the monitor interface, to make sure
1119 * that hostapd sees it
1121 if (ieee80211_has_a4(hdr
->frame_control
) &&
1122 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1123 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1124 !rx
->sdata
->u
.vlan
.sta
)))
1125 return RX_DROP_MONITOR
;
1127 * Update counter and free packet here to avoid
1128 * counting this as a dropped packed.
1131 dev_kfree_skb(rx
->skb
);
1136 } /* ieee80211_rx_h_sta_process */
1138 static inline struct ieee80211_fragment_entry
*
1139 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1140 unsigned int frag
, unsigned int seq
, int rx_queue
,
1141 struct sk_buff
**skb
)
1143 struct ieee80211_fragment_entry
*entry
;
1146 idx
= sdata
->fragment_next
;
1147 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1148 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1149 sdata
->fragment_next
= 0;
1151 if (!skb_queue_empty(&entry
->skb_list
)) {
1152 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1153 struct ieee80211_hdr
*hdr
=
1154 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1155 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1156 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1157 "addr1=%pM addr2=%pM\n",
1159 jiffies
- entry
->first_frag_time
, entry
->seq
,
1160 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1162 __skb_queue_purge(&entry
->skb_list
);
1165 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1167 entry
->first_frag_time
= jiffies
;
1169 entry
->rx_queue
= rx_queue
;
1170 entry
->last_frag
= frag
;
1172 entry
->extra_len
= 0;
1177 static inline struct ieee80211_fragment_entry
*
1178 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1179 unsigned int frag
, unsigned int seq
,
1180 int rx_queue
, struct ieee80211_hdr
*hdr
)
1182 struct ieee80211_fragment_entry
*entry
;
1185 idx
= sdata
->fragment_next
;
1186 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1187 struct ieee80211_hdr
*f_hdr
;
1191 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1193 entry
= &sdata
->fragments
[idx
];
1194 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1195 entry
->rx_queue
!= rx_queue
||
1196 entry
->last_frag
+ 1 != frag
)
1199 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1202 * Check ftype and addresses are equal, else check next fragment
1204 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1205 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1206 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1207 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1210 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1211 __skb_queue_purge(&entry
->skb_list
);
1220 static ieee80211_rx_result debug_noinline
1221 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1223 struct ieee80211_hdr
*hdr
;
1226 unsigned int frag
, seq
;
1227 struct ieee80211_fragment_entry
*entry
;
1228 struct sk_buff
*skb
;
1230 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1231 fc
= hdr
->frame_control
;
1232 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1233 frag
= sc
& IEEE80211_SCTL_FRAG
;
1235 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1236 (rx
->skb
)->len
< 24 ||
1237 is_multicast_ether_addr(hdr
->addr1
))) {
1238 /* not fragmented */
1241 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1243 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1246 /* This is the first fragment of a new frame. */
1247 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1248 rx
->queue
, &(rx
->skb
));
1249 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1250 ieee80211_has_protected(fc
)) {
1251 /* Store CCMP PN so that we can verify that the next
1252 * fragment has a sequential PN value. */
1254 memcpy(entry
->last_pn
,
1255 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1261 /* This is a fragment for a frame that should already be pending in
1262 * fragment cache. Add this fragment to the end of the pending entry.
1264 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1266 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1267 return RX_DROP_MONITOR
;
1270 /* Verify that MPDUs within one MSDU have sequential PN values.
1271 * (IEEE 802.11i, 8.3.3.4.5) */
1274 u8 pn
[CCMP_PN_LEN
], *rpn
;
1275 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1276 return RX_DROP_UNUSABLE
;
1277 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1278 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1283 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1284 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1285 return RX_DROP_UNUSABLE
;
1286 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1289 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1290 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1291 entry
->last_frag
= frag
;
1292 entry
->extra_len
+= rx
->skb
->len
;
1293 if (ieee80211_has_morefrags(fc
)) {
1298 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1299 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1300 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1301 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1303 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1304 __skb_queue_purge(&entry
->skb_list
);
1305 return RX_DROP_UNUSABLE
;
1308 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1309 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1313 /* Complete frame has been reassembled - process it now */
1314 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1318 rx
->sta
->rx_packets
++;
1319 if (is_multicast_ether_addr(hdr
->addr1
))
1320 rx
->local
->dot11MulticastReceivedFrameCount
++;
1322 ieee80211_led_rx(rx
->local
);
1326 static ieee80211_rx_result debug_noinline
1327 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1329 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1330 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1332 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1333 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1336 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1337 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1338 return RX_DROP_UNUSABLE
;
1340 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1341 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1343 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1345 /* Free PS Poll skb here instead of returning RX_DROP that would
1346 * count as an dropped frame. */
1347 dev_kfree_skb(rx
->skb
);
1352 static ieee80211_rx_result debug_noinline
1353 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1355 u8
*data
= rx
->skb
->data
;
1356 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1358 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1361 /* remove the qos control field, update frame type and meta-data */
1362 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1363 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1364 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1365 /* change frame type to non QOS */
1366 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1372 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1374 if (unlikely(!rx
->sta
||
1375 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1382 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1384 struct sk_buff
*skb
= rx
->skb
;
1385 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1388 * Pass through unencrypted frames if the hardware has
1389 * decrypted them already.
1391 if (status
->flag
& RX_FLAG_DECRYPTED
)
1394 /* Drop unencrypted frames if key is set. */
1395 if (unlikely(!ieee80211_has_protected(fc
) &&
1396 !ieee80211_is_nullfunc(fc
) &&
1397 ieee80211_is_data(fc
) &&
1398 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1400 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1401 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1404 /* BIP does not use Protected field, so need to check MMIE */
1405 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1406 ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1410 * When using MFP, Action frames are not allowed prior to
1411 * having configured keys.
1413 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1414 ieee80211_is_robust_mgmt_frame(
1415 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1423 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1425 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1426 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1428 if (ieee80211_has_a4(hdr
->frame_control
) &&
1429 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1432 if (is_multicast_ether_addr(hdr
->addr1
) &&
1433 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1434 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1437 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1441 * requires that rx->skb is a frame with ethernet header
1443 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1445 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1446 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1447 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1450 * Allow EAPOL frames to us/the PAE group address regardless
1451 * of whether the frame was encrypted or not.
1453 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1454 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1455 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1458 if (ieee80211_802_1x_port_control(rx
) ||
1459 ieee80211_drop_unencrypted(rx
, fc
))
1466 * requires that rx->skb is a frame with ethernet header
1469 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1471 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1472 struct net_device
*dev
= sdata
->dev
;
1473 struct sk_buff
*skb
, *xmit_skb
;
1474 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1475 struct sta_info
*dsta
;
1480 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1481 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1482 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1483 (rx
->flags
& IEEE80211_RX_RA_MATCH
) &&
1484 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1485 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1487 * send multicast frames both to higher layers in
1488 * local net stack and back to the wireless medium
1490 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1491 if (!xmit_skb
&& net_ratelimit())
1492 printk(KERN_DEBUG
"%s: failed to clone "
1493 "multicast frame\n", dev
->name
);
1495 dsta
= sta_info_get(sdata
, skb
->data
);
1498 * The destination station is associated to
1499 * this AP (in this VLAN), so send the frame
1500 * directly to it and do not pass it to local
1510 int align __maybe_unused
;
1512 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1514 * 'align' will only take the values 0 or 2 here
1515 * since all frames are required to be aligned
1516 * to 2-byte boundaries when being passed to
1517 * mac80211. That also explains the __skb_push()
1520 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1522 if (WARN_ON(skb_headroom(skb
) < 3)) {
1526 u8
*data
= skb
->data
;
1527 size_t len
= skb_headlen(skb
);
1529 memmove(skb
->data
, data
, len
);
1530 skb_set_tail_pointer(skb
, len
);
1536 /* deliver to local stack */
1537 skb
->protocol
= eth_type_trans(skb
, dev
);
1538 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1544 /* send to wireless media */
1545 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1546 skb_reset_network_header(xmit_skb
);
1547 skb_reset_mac_header(xmit_skb
);
1548 dev_queue_xmit(xmit_skb
);
1552 static ieee80211_rx_result debug_noinline
1553 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1555 struct net_device
*dev
= rx
->sdata
->dev
;
1556 struct sk_buff
*skb
= rx
->skb
;
1557 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1558 __le16 fc
= hdr
->frame_control
;
1559 struct sk_buff_head frame_list
;
1561 if (unlikely(!ieee80211_is_data(fc
)))
1564 if (unlikely(!ieee80211_is_data_present(fc
)))
1565 return RX_DROP_MONITOR
;
1567 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1570 if (ieee80211_has_a4(hdr
->frame_control
) &&
1571 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1572 !rx
->sdata
->u
.vlan
.sta
)
1573 return RX_DROP_UNUSABLE
;
1575 if (is_multicast_ether_addr(hdr
->addr1
) &&
1576 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1577 rx
->sdata
->u
.vlan
.sta
) ||
1578 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1579 rx
->sdata
->u
.mgd
.use_4addr
)))
1580 return RX_DROP_UNUSABLE
;
1583 __skb_queue_head_init(&frame_list
);
1585 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1586 rx
->sdata
->vif
.type
,
1587 rx
->local
->hw
.extra_tx_headroom
);
1589 while (!skb_queue_empty(&frame_list
)) {
1590 rx
->skb
= __skb_dequeue(&frame_list
);
1592 if (!ieee80211_frame_allowed(rx
, fc
)) {
1593 dev_kfree_skb(rx
->skb
);
1596 dev
->stats
.rx_packets
++;
1597 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1599 ieee80211_deliver_skb(rx
);
1605 #ifdef CONFIG_MAC80211_MESH
1606 static ieee80211_rx_result
1607 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1609 struct ieee80211_hdr
*hdr
;
1610 struct ieee80211s_hdr
*mesh_hdr
;
1611 unsigned int hdrlen
;
1612 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1613 struct ieee80211_local
*local
= rx
->local
;
1614 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1616 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1617 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1618 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1620 if (!ieee80211_is_data(hdr
->frame_control
))
1625 return RX_DROP_MONITOR
;
1627 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1628 struct mesh_path
*mppath
;
1632 if (is_multicast_ether_addr(hdr
->addr1
)) {
1633 mpp_addr
= hdr
->addr3
;
1634 proxied_addr
= mesh_hdr
->eaddr1
;
1636 mpp_addr
= hdr
->addr4
;
1637 proxied_addr
= mesh_hdr
->eaddr2
;
1641 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1643 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1645 spin_lock_bh(&mppath
->state_lock
);
1646 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1647 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1648 spin_unlock_bh(&mppath
->state_lock
);
1653 /* Frame has reached destination. Don't forward */
1654 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1655 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1660 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1662 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1663 dropped_frames_ttl
);
1665 struct ieee80211_hdr
*fwd_hdr
;
1666 struct ieee80211_tx_info
*info
;
1668 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1670 if (!fwd_skb
&& net_ratelimit())
1671 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1674 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1675 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1676 info
= IEEE80211_SKB_CB(fwd_skb
);
1677 memset(info
, 0, sizeof(*info
));
1678 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1679 info
->control
.vif
= &rx
->sdata
->vif
;
1680 skb_set_queue_mapping(skb
,
1681 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1682 ieee80211_set_qos_hdr(local
, skb
);
1683 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1684 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1689 * Save TA to addr1 to send TA a path error if a
1690 * suitable next hop is not found
1692 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1694 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1695 /* Failed to immediately resolve next hop:
1696 * fwded frame was dropped or will be added
1697 * later to the pending skb queue. */
1699 return RX_DROP_MONITOR
;
1701 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1704 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1706 ieee80211_add_pending_skb(local
, fwd_skb
);
1710 if (is_multicast_ether_addr(hdr
->addr1
) ||
1711 sdata
->dev
->flags
& IFF_PROMISC
)
1714 return RX_DROP_MONITOR
;
1718 static ieee80211_rx_result debug_noinline
1719 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1721 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1722 struct ieee80211_local
*local
= rx
->local
;
1723 struct net_device
*dev
= sdata
->dev
;
1724 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1725 __le16 fc
= hdr
->frame_control
;
1728 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1731 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1732 return RX_DROP_MONITOR
;
1735 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1736 * that a 4-addr station can be detected and moved into a separate VLAN
1738 if (ieee80211_has_a4(hdr
->frame_control
) &&
1739 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1740 return RX_DROP_MONITOR
;
1742 err
= __ieee80211_data_to_8023(rx
);
1744 return RX_DROP_UNUSABLE
;
1746 if (!ieee80211_frame_allowed(rx
, fc
))
1747 return RX_DROP_MONITOR
;
1751 dev
->stats
.rx_packets
++;
1752 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1754 if (ieee80211_is_data(hdr
->frame_control
) &&
1755 !is_multicast_ether_addr(hdr
->addr1
) &&
1756 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1757 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1758 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1761 ieee80211_deliver_skb(rx
);
1766 static ieee80211_rx_result debug_noinline
1767 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1769 struct ieee80211_local
*local
= rx
->local
;
1770 struct ieee80211_hw
*hw
= &local
->hw
;
1771 struct sk_buff
*skb
= rx
->skb
;
1772 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1773 struct tid_ampdu_rx
*tid_agg_rx
;
1777 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1780 if (ieee80211_is_back_req(bar
->frame_control
)) {
1782 return RX_DROP_MONITOR
;
1783 tid
= le16_to_cpu(bar
->control
) >> 12;
1784 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1785 != HT_AGG_STATE_OPERATIONAL
)
1786 return RX_DROP_MONITOR
;
1787 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1789 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1791 /* reset session timer */
1792 if (tid_agg_rx
->timeout
)
1793 mod_timer(&tid_agg_rx
->session_timer
,
1794 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1796 /* release stored frames up to start of BAR */
1797 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1806 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1807 struct ieee80211_mgmt
*mgmt
,
1810 struct ieee80211_local
*local
= sdata
->local
;
1811 struct sk_buff
*skb
;
1812 struct ieee80211_mgmt
*resp
;
1814 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1815 /* Not to own unicast address */
1819 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1820 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1821 /* Not from the current AP or not associated yet. */
1825 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1826 /* Too short SA Query request frame */
1830 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1834 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1835 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1836 memset(resp
, 0, 24);
1837 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1838 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
1839 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1840 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1841 IEEE80211_STYPE_ACTION
);
1842 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1843 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1844 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1845 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1846 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1847 WLAN_SA_QUERY_TR_ID_LEN
);
1849 ieee80211_tx_skb(sdata
, skb
);
1852 static ieee80211_rx_result debug_noinline
1853 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1855 struct ieee80211_local
*local
= rx
->local
;
1856 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1857 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1858 struct sk_buff
*nskb
;
1859 int len
= rx
->skb
->len
;
1861 if (!ieee80211_is_action(mgmt
->frame_control
))
1865 return RX_DROP_UNUSABLE
;
1867 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1868 return RX_DROP_UNUSABLE
;
1870 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1871 return RX_DROP_UNUSABLE
;
1873 /* drop too small frames */
1874 if (len
< IEEE80211_MIN_ACTION_SIZE
)
1875 return RX_DROP_UNUSABLE
;
1877 /* return action frames that have *only* category */
1878 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1881 switch (mgmt
->u
.action
.category
) {
1882 case WLAN_CATEGORY_BACK
:
1884 * The aggregation code is not prepared to handle
1885 * anything but STA/AP due to the BSSID handling;
1886 * IBSS could work in the code but isn't supported
1887 * by drivers or the standard.
1889 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1890 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1891 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1894 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1895 case WLAN_ACTION_ADDBA_REQ
:
1896 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1897 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1898 return RX_DROP_MONITOR
;
1899 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1901 case WLAN_ACTION_ADDBA_RESP
:
1902 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1903 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1905 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1907 case WLAN_ACTION_DELBA
:
1908 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1909 sizeof(mgmt
->u
.action
.u
.delba
)))
1911 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1915 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1916 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1919 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1922 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1923 case WLAN_ACTION_SPCT_MSR_REQ
:
1924 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1925 sizeof(mgmt
->u
.action
.u
.measurement
)))
1927 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1929 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1930 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1931 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1934 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1937 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1940 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
1943 case WLAN_CATEGORY_SA_QUERY
:
1944 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1945 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1948 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1949 case WLAN_ACTION_SA_QUERY_REQUEST
:
1950 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1952 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1959 * For AP mode, hostapd is responsible for handling any action
1960 * frames that we didn't handle, including returning unknown
1961 * ones. For all other modes we will return them to the sender,
1962 * setting the 0x80 bit in the action category, as required by
1963 * 802.11-2007 7.3.1.11.
1965 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1966 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1967 return RX_DROP_MONITOR
;
1969 /* do not return rejected action frames */
1970 if (mgmt
->u
.action
.category
& 0x80)
1971 return RX_DROP_UNUSABLE
;
1973 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
1976 struct ieee80211_mgmt
*mgmt
= (void *)nskb
->data
;
1978 mgmt
->u
.action
.category
|= 0x80;
1979 memcpy(mgmt
->da
, mgmt
->sa
, ETH_ALEN
);
1980 memcpy(mgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
1982 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
1984 ieee80211_tx_skb(rx
->sdata
, nskb
);
1988 rx
->sta
->rx_packets
++;
1989 dev_kfree_skb(rx
->skb
);
1993 static ieee80211_rx_result debug_noinline
1994 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
1996 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1997 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1998 ieee80211_rx_result rxs
;
2000 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
2001 return RX_DROP_MONITOR
;
2003 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
2004 return RX_DROP_MONITOR
;
2006 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2007 if (rxs
!= RX_CONTINUE
)
2010 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2011 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2013 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2014 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
);
2016 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2017 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
2019 return RX_DROP_MONITOR
;
2022 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2023 struct ieee80211_rx_data
*rx
)
2026 unsigned int hdrlen
;
2028 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2029 if (rx
->skb
->len
>= hdrlen
+ 4)
2030 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2036 * Some hardware seem to generate incorrect Michael MIC
2037 * reports; ignore them to avoid triggering countermeasures.
2042 if (!ieee80211_has_protected(hdr
->frame_control
))
2045 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2047 * APs with pairwise keys should never receive Michael MIC
2048 * errors for non-zero keyidx because these are reserved for
2049 * group keys and only the AP is sending real multicast
2050 * frames in the BSS.
2055 if (!ieee80211_is_data(hdr
->frame_control
) &&
2056 !ieee80211_is_auth(hdr
->frame_control
))
2059 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2063 /* TODO: use IEEE80211_RX_FRAGMENTED */
2064 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2065 struct ieee80211_rate
*rate
)
2067 struct ieee80211_sub_if_data
*sdata
;
2068 struct ieee80211_local
*local
= rx
->local
;
2069 struct ieee80211_rtap_hdr
{
2070 struct ieee80211_radiotap_header hdr
;
2075 } __attribute__ ((packed
)) *rthdr
;
2076 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2077 struct net_device
*prev_dev
= NULL
;
2078 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2080 if (status
->flag
& RX_FLAG_INTERNAL_CMTR
)
2083 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2084 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2087 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2088 memset(rthdr
, 0, sizeof(*rthdr
));
2089 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2090 rthdr
->hdr
.it_present
=
2091 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2092 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2095 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2096 rthdr
->hdr
.it_present
|=
2097 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2099 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2101 if (status
->band
== IEEE80211_BAND_5GHZ
)
2102 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2103 IEEE80211_CHAN_5GHZ
);
2105 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2106 IEEE80211_CHAN_2GHZ
);
2108 skb_set_mac_header(skb
, 0);
2109 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2110 skb
->pkt_type
= PACKET_OTHERHOST
;
2111 skb
->protocol
= htons(ETH_P_802_2
);
2113 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2114 if (!ieee80211_sdata_running(sdata
))
2117 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2118 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2122 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2124 skb2
->dev
= prev_dev
;
2129 prev_dev
= sdata
->dev
;
2130 sdata
->dev
->stats
.rx_packets
++;
2131 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2135 skb
->dev
= prev_dev
;
2141 status
->flag
|= RX_FLAG_INTERNAL_CMTR
;
2149 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2150 struct ieee80211_rx_data
*rx
,
2151 struct sk_buff
*skb
,
2152 struct ieee80211_rate
*rate
)
2154 struct sk_buff_head reorder_release
;
2155 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2157 __skb_queue_head_init(&reorder_release
);
2162 #define CALL_RXH(rxh) \
2165 if (res != RX_CONTINUE) \
2170 * NB: the rxh_next label works even if we jump
2171 * to it from here because then the list will
2172 * be empty, which is a trivial check
2174 CALL_RXH(ieee80211_rx_h_passive_scan
)
2175 CALL_RXH(ieee80211_rx_h_check
)
2177 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2179 while ((skb
= __skb_dequeue(&reorder_release
))) {
2181 * all the other fields are valid across frames
2182 * that belong to an aMPDU since they are on the
2183 * same TID from the same station
2187 CALL_RXH(ieee80211_rx_h_decrypt
)
2188 CALL_RXH(ieee80211_rx_h_check_more_data
)
2189 CALL_RXH(ieee80211_rx_h_sta_process
)
2190 CALL_RXH(ieee80211_rx_h_defragment
)
2191 CALL_RXH(ieee80211_rx_h_ps_poll
)
2192 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2193 /* must be after MMIC verify so header is counted in MPDU mic */
2194 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2195 CALL_RXH(ieee80211_rx_h_amsdu
)
2196 #ifdef CONFIG_MAC80211_MESH
2197 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2198 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2200 CALL_RXH(ieee80211_rx_h_data
)
2202 /* special treatment -- needs the queue */
2203 res
= ieee80211_rx_h_ctrl(rx
, &reorder_release
);
2204 if (res
!= RX_CONTINUE
)
2207 CALL_RXH(ieee80211_rx_h_action
)
2208 CALL_RXH(ieee80211_rx_h_mgmt
)
2214 case RX_DROP_MONITOR
:
2215 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2217 rx
->sta
->rx_dropped
++;
2220 ieee80211_rx_cooked_monitor(rx
, rate
);
2222 case RX_DROP_UNUSABLE
:
2223 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2225 rx
->sta
->rx_dropped
++;
2226 dev_kfree_skb(rx
->skb
);
2229 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2235 /* main receive path */
2237 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2238 struct ieee80211_rx_data
*rx
,
2239 struct ieee80211_hdr
*hdr
)
2241 struct sk_buff
*skb
= rx
->skb
;
2242 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2243 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2244 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2246 switch (sdata
->vif
.type
) {
2247 case NL80211_IFTYPE_STATION
:
2248 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2251 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2252 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2254 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2257 case NL80211_IFTYPE_ADHOC
:
2260 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2263 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2264 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2266 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2267 } else if (!multicast
&&
2268 compare_ether_addr(sdata
->vif
.addr
,
2270 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2272 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2273 } else if (!rx
->sta
) {
2275 if (status
->flag
& RX_FLAG_HT
)
2276 rate_idx
= 0; /* TODO: HT rates */
2278 rate_idx
= status
->rate_idx
;
2279 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2280 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2283 case NL80211_IFTYPE_MESH_POINT
:
2285 compare_ether_addr(sdata
->vif
.addr
,
2287 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2290 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2293 case NL80211_IFTYPE_AP_VLAN
:
2294 case NL80211_IFTYPE_AP
:
2296 if (compare_ether_addr(sdata
->vif
.addr
,
2299 } else if (!ieee80211_bssid_match(bssid
,
2301 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2303 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2306 case NL80211_IFTYPE_WDS
:
2307 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2309 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2312 case NL80211_IFTYPE_MONITOR
:
2313 case NL80211_IFTYPE_UNSPECIFIED
:
2314 case __NL80211_IFTYPE_AFTER_LAST
:
2315 /* should never get here */
2324 * This is the actual Rx frames handler. as it blongs to Rx path it must
2325 * be called with rcu_read_lock protection.
2327 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2328 struct sk_buff
*skb
,
2329 struct ieee80211_rate
*rate
)
2331 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2332 struct ieee80211_local
*local
= hw_to_local(hw
);
2333 struct ieee80211_sub_if_data
*sdata
;
2334 struct ieee80211_hdr
*hdr
;
2335 struct ieee80211_rx_data rx
;
2337 struct ieee80211_sub_if_data
*prev
= NULL
;
2338 struct sk_buff
*skb_new
;
2339 struct sta_info
*sta
, *tmp
;
2340 bool found_sta
= false;
2342 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2343 memset(&rx
, 0, sizeof(rx
));
2347 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2348 local
->dot11ReceivedFragmentCount
++;
2350 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2351 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2352 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2354 ieee80211_parse_qos(&rx
);
2355 ieee80211_verify_alignment(&rx
);
2357 if (ieee80211_is_data(hdr
->frame_control
)) {
2358 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2361 rx
.sdata
= sta
->sdata
;
2363 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2364 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2366 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2367 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2368 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2375 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2376 if (!ieee80211_sdata_running(sdata
))
2379 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2380 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2384 * frame is destined for this interface, but if it's
2385 * not also for the previous one we handle that after
2386 * the loop to avoid copying the SKB once too much
2394 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2396 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2397 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2402 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2404 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2405 ieee80211_rx_michael_mic_report(hdr
,
2411 * frame was destined for the previous interface
2412 * so invoke RX handlers for it
2415 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2417 if (net_ratelimit())
2418 printk(KERN_DEBUG
"%s: failed to copy "
2419 "multicast frame for %s\n",
2420 wiphy_name(local
->hw
.wiphy
),
2424 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
, rate
);
2430 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2432 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2433 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2440 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
, rate
);
2446 * This is the receive path handler. It is called by a low level driver when an
2447 * 802.11 MPDU is received from the hardware.
2449 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2451 struct ieee80211_local
*local
= hw_to_local(hw
);
2452 struct ieee80211_rate
*rate
= NULL
;
2453 struct ieee80211_supported_band
*sband
;
2454 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2456 WARN_ON_ONCE(softirq_count() == 0);
2458 if (WARN_ON(status
->band
< 0 ||
2459 status
->band
>= IEEE80211_NUM_BANDS
))
2462 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2463 if (WARN_ON(!sband
))
2467 * If we're suspending, it is possible although not too likely
2468 * that we'd be receiving frames after having already partially
2469 * quiesced the stack. We can't process such frames then since
2470 * that might, for example, cause stations to be added or other
2471 * driver callbacks be invoked.
2473 if (unlikely(local
->quiescing
|| local
->suspended
))
2477 * The same happens when we're not even started,
2478 * but that's worth a warning.
2480 if (WARN_ON(!local
->started
))
2483 if (status
->flag
& RX_FLAG_HT
) {
2485 * rate_idx is MCS index, which can be [0-76] as documented on:
2487 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2489 * Anything else would be some sort of driver or hardware error.
2490 * The driver should catch hardware errors.
2492 if (WARN((status
->rate_idx
< 0 ||
2493 status
->rate_idx
> 76),
2494 "Rate marked as an HT rate but passed "
2495 "status->rate_idx is not "
2496 "an MCS index [0-76]: %d (0x%02x)\n",
2501 if (WARN_ON(status
->rate_idx
< 0 ||
2502 status
->rate_idx
>= sband
->n_bitrates
))
2504 rate
= &sband
->bitrates
[status
->rate_idx
];
2508 * key references and virtual interfaces are protected using RCU
2509 * and this requires that we are in a read-side RCU section during
2510 * receive processing
2515 * Frames with failed FCS/PLCP checksum are not returned,
2516 * all other frames are returned without radiotap header
2517 * if it was previously present.
2518 * Also, frames with less than 16 bytes are dropped.
2520 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2526 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2534 EXPORT_SYMBOL(ieee80211_rx
);
2536 /* This is a version of the rx handler that can be called from hard irq
2537 * context. Post the skb on the queue and schedule the tasklet */
2538 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2540 struct ieee80211_local
*local
= hw_to_local(hw
);
2542 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2544 skb
->pkt_type
= IEEE80211_RX_MSG
;
2545 skb_queue_tail(&local
->skb_queue
, skb
);
2546 tasklet_schedule(&local
->tasklet
);
2548 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);