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 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 (!netif_running(sdata
->dev
))
289 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
292 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
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
366 * With A-MSDU frames, however, the payload data address must yield two modulo
367 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
368 * push the IP header further back to a multiple of four again. Thankfully, the
369 * specs were sane enough this time around to require padding each A-MSDU
370 * subframe to a length that is a multiple of four.
372 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
373 * the payload is not supported, the driver is required to move the 802.11
374 * header to be directly in front of the payload in that case.
376 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
378 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
381 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
385 if (WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
386 "unaligned packet at 0x%p\n", rx
->skb
->data
))
389 if (!ieee80211_is_data_present(hdr
->frame_control
))
392 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
393 if (rx
->flags
& IEEE80211_RX_AMSDU
)
395 WARN_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3,
396 "unaligned IP payload at 0x%p\n", rx
->skb
->data
+ hdrlen
);
402 static ieee80211_rx_result debug_noinline
403 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
405 struct ieee80211_local
*local
= rx
->local
;
406 struct sk_buff
*skb
= rx
->skb
;
408 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
409 return ieee80211_scan_rx(rx
->sdata
, skb
);
411 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
412 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
413 /* drop all the other packets during a software scan anyway */
414 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
419 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
420 /* scanning finished during invoking of handlers */
421 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
422 return RX_DROP_UNUSABLE
;
429 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
431 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
433 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
436 return ieee80211_is_robust_mgmt_frame(hdr
);
440 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
442 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
444 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
447 return ieee80211_is_robust_mgmt_frame(hdr
);
451 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
452 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
454 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
455 struct ieee80211_mmie
*mmie
;
457 if (skb
->len
< 24 + sizeof(*mmie
) ||
458 !is_multicast_ether_addr(hdr
->da
))
461 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
462 return -1; /* not a robust management frame */
464 mmie
= (struct ieee80211_mmie
*)
465 (skb
->data
+ skb
->len
- sizeof(*mmie
));
466 if (mmie
->element_id
!= WLAN_EID_MMIE
||
467 mmie
->length
!= sizeof(*mmie
) - 2)
470 return le16_to_cpu(mmie
->key_id
);
474 static ieee80211_rx_result
475 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
477 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
478 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
479 char *dev_addr
= rx
->sdata
->dev
->dev_addr
;
481 if (ieee80211_is_data(hdr
->frame_control
)) {
482 if (is_multicast_ether_addr(hdr
->addr1
)) {
483 if (ieee80211_has_tods(hdr
->frame_control
) ||
484 !ieee80211_has_fromds(hdr
->frame_control
))
485 return RX_DROP_MONITOR
;
486 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
487 return RX_DROP_MONITOR
;
489 if (!ieee80211_has_a4(hdr
->frame_control
))
490 return RX_DROP_MONITOR
;
491 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
492 return RX_DROP_MONITOR
;
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
500 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
501 struct ieee80211_mgmt
*mgmt
;
503 if (!ieee80211_is_mgmt(hdr
->frame_control
))
504 return RX_DROP_MONITOR
;
506 if (ieee80211_is_action(hdr
->frame_control
)) {
507 mgmt
= (struct ieee80211_mgmt
*)hdr
;
508 if (mgmt
->u
.action
.category
!= MESH_PLINK_CATEGORY
)
509 return RX_DROP_MONITOR
;
513 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
514 ieee80211_is_probe_resp(hdr
->frame_control
) ||
515 ieee80211_is_beacon(hdr
->frame_control
))
518 return RX_DROP_MONITOR
;
522 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
524 if (ieee80211_is_data(hdr
->frame_control
) &&
525 is_multicast_ether_addr(hdr
->addr1
) &&
526 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
527 return RX_DROP_MONITOR
;
533 #define SEQ_MODULO 0x1000
534 #define SEQ_MASK 0xfff
536 static inline int seq_less(u16 sq1
, u16 sq2
)
538 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
541 static inline u16
seq_inc(u16 sq
)
543 return (sq
+ 1) & SEQ_MASK
;
546 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
548 return (sq1
- sq2
) & SEQ_MASK
;
552 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
553 struct tid_ampdu_rx
*tid_agg_rx
,
555 struct sk_buff_head
*frames
)
557 struct ieee80211_supported_band
*sband
;
558 struct ieee80211_rate
*rate
= NULL
;
559 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
560 struct ieee80211_rx_status
*status
;
565 status
= IEEE80211_SKB_RXCB(skb
);
567 /* release the reordered frames to stack */
568 sband
= hw
->wiphy
->bands
[status
->band
];
569 if (!(status
->flag
& RX_FLAG_HT
))
570 rate
= &sband
->bitrates
[status
->rate_idx
];
571 tid_agg_rx
->stored_mpdu_num
--;
572 tid_agg_rx
->reorder_buf
[index
] = NULL
;
573 __skb_queue_tail(frames
, skb
);
576 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
579 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
580 struct tid_ampdu_rx
*tid_agg_rx
,
582 struct sk_buff_head
*frames
)
586 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
587 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
588 tid_agg_rx
->buf_size
;
589 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
594 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
595 * the skb was added to the buffer longer than this time ago, the earlier
596 * frames that have not yet been received are assumed to be lost and the skb
597 * can be released for processing. This may also release other skb's from the
598 * reorder buffer if there are no additional gaps between the frames.
600 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
603 * As this function belongs to the RX path it must be under
604 * rcu_read_lock protection. It returns false if the frame
605 * can be processed immediately, true if it was consumed.
607 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
608 struct tid_ampdu_rx
*tid_agg_rx
,
610 struct sk_buff_head
*frames
)
612 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
613 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
614 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
615 u16 head_seq_num
, buf_size
;
618 buf_size
= tid_agg_rx
->buf_size
;
619 head_seq_num
= tid_agg_rx
->head_seq_num
;
621 /* frame with out of date sequence number */
622 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
628 * If frame the sequence number exceeds our buffering window
629 * size release some previous frames to make room for this one.
631 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
632 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
633 /* release stored frames up to new head to stack */
634 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
638 /* Now the new frame is always in the range of the reordering buffer */
640 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
642 /* check if we already stored this frame */
643 if (tid_agg_rx
->reorder_buf
[index
]) {
649 * If the current MPDU is in the right order and nothing else
650 * is stored we can process it directly, no need to buffer it.
652 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
653 tid_agg_rx
->stored_mpdu_num
== 0) {
654 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
658 /* put the frame in the reordering buffer */
659 tid_agg_rx
->reorder_buf
[index
] = skb
;
660 tid_agg_rx
->reorder_time
[index
] = jiffies
;
661 tid_agg_rx
->stored_mpdu_num
++;
662 /* release the buffer until next missing frame */
663 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
664 tid_agg_rx
->buf_size
;
665 if (!tid_agg_rx
->reorder_buf
[index
] &&
666 tid_agg_rx
->stored_mpdu_num
> 1) {
668 * No buffers ready to be released, but check whether any
669 * frames in the reorder buffer have timed out.
673 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
674 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
675 if (!tid_agg_rx
->reorder_buf
[j
]) {
679 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
680 HT_RX_REORDER_BUF_TIMEOUT
))
683 #ifdef CONFIG_MAC80211_HT_DEBUG
685 printk(KERN_DEBUG
"%s: release an RX reorder "
686 "frame due to timeout on earlier "
688 wiphy_name(hw
->wiphy
));
690 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
694 * Increment the head seq# also for the skipped slots.
696 tid_agg_rx
->head_seq_num
=
697 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
700 } else while (tid_agg_rx
->reorder_buf
[index
]) {
701 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
702 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
703 tid_agg_rx
->buf_size
;
710 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
711 * true if the MPDU was buffered, false if it should be processed.
713 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
714 struct sk_buff_head
*frames
)
716 struct sk_buff
*skb
= rx
->skb
;
717 struct ieee80211_local
*local
= rx
->local
;
718 struct ieee80211_hw
*hw
= &local
->hw
;
719 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
720 struct sta_info
*sta
= rx
->sta
;
721 struct tid_ampdu_rx
*tid_agg_rx
;
725 if (!ieee80211_is_data_qos(hdr
->frame_control
))
729 * filter the QoS data rx stream according to
730 * STA/TID and check if this STA/TID is on aggregation
736 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
738 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
741 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
743 /* qos null data frames are excluded */
744 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
747 /* new, potentially un-ordered, ampdu frame - process it */
749 /* reset session timer */
750 if (tid_agg_rx
->timeout
)
751 mod_timer(&tid_agg_rx
->session_timer
,
752 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
754 /* if this mpdu is fragmented - terminate rx aggregation session */
755 sc
= le16_to_cpu(hdr
->seq_ctrl
);
756 if (sc
& IEEE80211_SCTL_FRAG
) {
757 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
758 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
763 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
))
767 __skb_queue_tail(frames
, skb
);
770 static ieee80211_rx_result debug_noinline
771 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
773 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
775 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
776 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
777 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
778 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
780 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
781 rx
->local
->dot11FrameDuplicateCount
++;
782 rx
->sta
->num_duplicates
++;
784 return RX_DROP_MONITOR
;
786 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
789 if (unlikely(rx
->skb
->len
< 16)) {
790 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
791 return RX_DROP_MONITOR
;
794 /* Drop disallowed frame classes based on STA auth/assoc state;
795 * IEEE 802.11, Chap 5.5.
797 * mac80211 filters only based on association state, i.e. it drops
798 * Class 3 frames from not associated stations. hostapd sends
799 * deauth/disassoc frames when needed. In addition, hostapd is
800 * responsible for filtering on both auth and assoc states.
803 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
804 return ieee80211_rx_mesh_check(rx
);
806 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
807 ieee80211_is_pspoll(hdr
->frame_control
)) &&
808 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
809 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
810 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
811 !ieee80211_has_tods(hdr
->frame_control
) &&
812 ieee80211_is_data(hdr
->frame_control
)) ||
813 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
814 /* Drop IBSS frames and frames for other hosts
816 return RX_DROP_MONITOR
;
819 return RX_DROP_MONITOR
;
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
829 struct sk_buff
*skb
= rx
->skb
;
830 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
831 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
834 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
835 struct ieee80211_key
*stakey
= NULL
;
836 int mmie_keyidx
= -1;
841 * There are four types of keys:
843 * - IGTK (group keys for management frames)
844 * - PTK (pairwise keys)
845 * - STK (station-to-station pairwise keys)
847 * When selecting a key, we have to distinguish between multicast
848 * (including broadcast) and unicast frames, the latter can only
849 * use PTKs and STKs while the former always use GTKs and IGTKs.
850 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
851 * unicast frames can also use key indices like GTKs. Hence, if we
852 * don't have a PTK/STK we check the key index for a WEP key.
854 * Note that in a regular BSS, multicast frames are sent by the
855 * AP only, associated stations unicast the frame to the AP first
856 * which then multicasts it on their behalf.
858 * There is also a slight problem in IBSS mode: GTKs are negotiated
859 * with each station, that is something we don't currently handle.
860 * The spec seems to expect that one negotiates the same key with
861 * every station but there's no such requirement; VLANs could be
866 * No point in finding a key and decrypting if the frame is neither
867 * addressed to us nor a multicast frame.
869 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
872 /* start without a key */
876 stakey
= rcu_dereference(rx
->sta
->key
);
878 if (!ieee80211_has_protected(hdr
->frame_control
))
879 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
881 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
883 /* Skip decryption if the frame is not protected. */
884 if (!ieee80211_has_protected(hdr
->frame_control
))
886 } else if (mmie_keyidx
>= 0) {
887 /* Broadcast/multicast robust management frame / BIP */
888 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
889 (status
->flag
& RX_FLAG_IV_STRIPPED
))
892 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
893 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
894 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
895 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
896 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
898 * The frame was not protected, so skip decryption. However, we
899 * need to set rx->key if there is a key that could have been
900 * used so that the frame may be dropped if encryption would
901 * have been expected.
903 struct ieee80211_key
*key
= NULL
;
904 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
905 is_multicast_ether_addr(hdr
->addr1
) &&
906 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
908 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
913 * The device doesn't give us the IV so we won't be
914 * able to look up the key. That's ok though, we
915 * don't need to decrypt the frame, we just won't
916 * be able to keep statistics accurate.
917 * Except for key threshold notifications, should
918 * we somehow allow the driver to tell us which key
919 * the hardware used if this flag is set?
921 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
922 (status
->flag
& RX_FLAG_IV_STRIPPED
))
925 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
927 if (rx
->skb
->len
< 8 + hdrlen
)
928 return RX_DROP_UNUSABLE
; /* TODO: count this? */
931 * no need to call ieee80211_wep_get_keyidx,
932 * it verifies a bunch of things we've done already
934 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
936 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
939 * RSNA-protected unicast frames should always be sent with
940 * pairwise or station-to-station keys, but for WEP we allow
941 * using a key index as well.
943 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
944 !is_multicast_ether_addr(hdr
->addr1
))
949 rx
->key
->tx_rx_count
++;
950 /* TODO: add threshold stuff again */
952 return RX_DROP_MONITOR
;
955 /* Check for weak IVs if possible */
956 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
957 ieee80211_is_data(hdr
->frame_control
) &&
958 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
959 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
960 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
961 rx
->sta
->wep_weak_iv_count
++;
963 switch (rx
->key
->conf
.alg
) {
965 result
= ieee80211_crypto_wep_decrypt(rx
);
968 result
= ieee80211_crypto_tkip_decrypt(rx
);
971 result
= ieee80211_crypto_ccmp_decrypt(rx
);
974 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
978 /* either the frame has been decrypted or will be dropped */
979 status
->flag
|= RX_FLAG_DECRYPTED
;
984 static ieee80211_rx_result debug_noinline
985 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
987 struct ieee80211_local
*local
;
988 struct ieee80211_hdr
*hdr
;
993 hdr
= (struct ieee80211_hdr
*) skb
->data
;
995 if (!local
->pspolling
)
998 if (!ieee80211_has_fromds(hdr
->frame_control
))
999 /* this is not from AP */
1002 if (!ieee80211_is_data(hdr
->frame_control
))
1005 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1006 /* AP has no more frames buffered for us */
1007 local
->pspolling
= false;
1011 /* more data bit is set, let's request a new frame from the AP */
1012 ieee80211_send_pspoll(local
, rx
->sdata
);
1017 static void ap_sta_ps_start(struct sta_info
*sta
)
1019 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1020 struct ieee80211_local
*local
= sdata
->local
;
1022 atomic_inc(&sdata
->bss
->num_sta_ps
);
1023 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1024 drv_sta_notify(local
, &sdata
->vif
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1025 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1026 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1027 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1028 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1031 static void ap_sta_ps_end(struct sta_info
*sta
)
1033 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1035 atomic_dec(&sdata
->bss
->num_sta_ps
);
1037 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
1039 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1040 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1041 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1042 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1044 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1045 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1046 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1047 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1048 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1052 ieee80211_sta_ps_deliver_wakeup(sta
);
1055 static ieee80211_rx_result debug_noinline
1056 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1058 struct sta_info
*sta
= rx
->sta
;
1059 struct sk_buff
*skb
= rx
->skb
;
1060 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1061 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1067 * Update last_rx only for IBSS packets which are for the current
1068 * BSSID to avoid keeping the current IBSS network alive in cases
1069 * where other STAs start using different BSSID.
1071 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1072 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1073 NL80211_IFTYPE_ADHOC
);
1074 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1075 sta
->last_rx
= jiffies
;
1076 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1078 * Mesh beacons will update last_rx when if they are found to
1079 * match the current local configuration when processed.
1081 sta
->last_rx
= jiffies
;
1084 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1087 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1088 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1090 sta
->rx_fragments
++;
1091 sta
->rx_bytes
+= rx
->skb
->len
;
1092 sta
->last_signal
= status
->signal
;
1093 sta
->last_noise
= status
->noise
;
1096 * Change STA power saving mode only at the end of a frame
1097 * exchange sequence.
1099 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1100 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1101 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1102 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1104 * Ignore doze->wake transitions that are
1105 * indicated by non-data frames, the standard
1106 * is unclear here, but for example going to
1107 * PS mode and then scanning would cause a
1108 * doze->wake transition for the probe request,
1109 * and that is clearly undesirable.
1111 if (ieee80211_is_data(hdr
->frame_control
) &&
1112 !ieee80211_has_pm(hdr
->frame_control
))
1115 if (ieee80211_has_pm(hdr
->frame_control
))
1116 ap_sta_ps_start(sta
);
1121 * Drop (qos-)data::nullfunc frames silently, since they
1122 * are used only to control station power saving mode.
1124 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1125 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1126 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1128 * Update counter and free packet here to avoid
1129 * counting this as a dropped packed.
1132 dev_kfree_skb(rx
->skb
);
1137 } /* ieee80211_rx_h_sta_process */
1139 static inline struct ieee80211_fragment_entry
*
1140 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1141 unsigned int frag
, unsigned int seq
, int rx_queue
,
1142 struct sk_buff
**skb
)
1144 struct ieee80211_fragment_entry
*entry
;
1147 idx
= sdata
->fragment_next
;
1148 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1149 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1150 sdata
->fragment_next
= 0;
1152 if (!skb_queue_empty(&entry
->skb_list
)) {
1153 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1154 struct ieee80211_hdr
*hdr
=
1155 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1156 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1157 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1158 "addr1=%pM addr2=%pM\n",
1159 sdata
->dev
->name
, idx
,
1160 jiffies
- entry
->first_frag_time
, entry
->seq
,
1161 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1163 __skb_queue_purge(&entry
->skb_list
);
1166 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1168 entry
->first_frag_time
= jiffies
;
1170 entry
->rx_queue
= rx_queue
;
1171 entry
->last_frag
= frag
;
1173 entry
->extra_len
= 0;
1178 static inline struct ieee80211_fragment_entry
*
1179 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1180 unsigned int frag
, unsigned int seq
,
1181 int rx_queue
, struct ieee80211_hdr
*hdr
)
1183 struct ieee80211_fragment_entry
*entry
;
1186 idx
= sdata
->fragment_next
;
1187 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1188 struct ieee80211_hdr
*f_hdr
;
1192 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1194 entry
= &sdata
->fragments
[idx
];
1195 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1196 entry
->rx_queue
!= rx_queue
||
1197 entry
->last_frag
+ 1 != frag
)
1200 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1203 * Check ftype and addresses are equal, else check next fragment
1205 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1206 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1207 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1208 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1211 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1212 __skb_queue_purge(&entry
->skb_list
);
1221 static ieee80211_rx_result debug_noinline
1222 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1224 struct ieee80211_hdr
*hdr
;
1227 unsigned int frag
, seq
;
1228 struct ieee80211_fragment_entry
*entry
;
1229 struct sk_buff
*skb
;
1231 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1232 fc
= hdr
->frame_control
;
1233 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1234 frag
= sc
& IEEE80211_SCTL_FRAG
;
1236 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1237 (rx
->skb
)->len
< 24 ||
1238 is_multicast_ether_addr(hdr
->addr1
))) {
1239 /* not fragmented */
1242 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1244 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1247 /* This is the first fragment of a new frame. */
1248 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1249 rx
->queue
, &(rx
->skb
));
1250 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1251 ieee80211_has_protected(fc
)) {
1252 /* Store CCMP PN so that we can verify that the next
1253 * fragment has a sequential PN value. */
1255 memcpy(entry
->last_pn
,
1256 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1262 /* This is a fragment for a frame that should already be pending in
1263 * fragment cache. Add this fragment to the end of the pending entry.
1265 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1267 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1268 return RX_DROP_MONITOR
;
1271 /* Verify that MPDUs within one MSDU have sequential PN values.
1272 * (IEEE 802.11i, 8.3.3.4.5) */
1275 u8 pn
[CCMP_PN_LEN
], *rpn
;
1276 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1277 return RX_DROP_UNUSABLE
;
1278 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1279 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1284 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1285 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1286 return RX_DROP_UNUSABLE
;
1287 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1290 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1291 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1292 entry
->last_frag
= frag
;
1293 entry
->extra_len
+= rx
->skb
->len
;
1294 if (ieee80211_has_morefrags(fc
)) {
1299 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1300 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1301 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1302 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1304 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1305 __skb_queue_purge(&entry
->skb_list
);
1306 return RX_DROP_UNUSABLE
;
1309 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1310 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1314 /* Complete frame has been reassembled - process it now */
1315 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1319 rx
->sta
->rx_packets
++;
1320 if (is_multicast_ether_addr(hdr
->addr1
))
1321 rx
->local
->dot11MulticastReceivedFrameCount
++;
1323 ieee80211_led_rx(rx
->local
);
1327 static ieee80211_rx_result debug_noinline
1328 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1330 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1331 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1333 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1334 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1337 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1338 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1339 return RX_DROP_UNUSABLE
;
1341 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1342 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1344 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1346 /* Free PS Poll skb here instead of returning RX_DROP that would
1347 * count as an dropped frame. */
1348 dev_kfree_skb(rx
->skb
);
1353 static ieee80211_rx_result debug_noinline
1354 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1356 u8
*data
= rx
->skb
->data
;
1357 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1359 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1362 /* remove the qos control field, update frame type and meta-data */
1363 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1364 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1365 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1366 /* change frame type to non QOS */
1367 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1373 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1375 if (unlikely(!rx
->sta
||
1376 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1383 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1385 struct sk_buff
*skb
= rx
->skb
;
1386 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1389 * Pass through unencrypted frames if the hardware has
1390 * decrypted them already.
1392 if (status
->flag
& RX_FLAG_DECRYPTED
)
1395 /* Drop unencrypted frames if key is set. */
1396 if (unlikely(!ieee80211_has_protected(fc
) &&
1397 !ieee80211_is_nullfunc(fc
) &&
1398 ieee80211_is_data(fc
) &&
1399 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1401 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1402 if (unlikely(!ieee80211_has_protected(fc
) &&
1403 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1406 /* BIP does not use Protected field, so need to check MMIE */
1407 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1408 ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1412 * When using MFP, Action frames are not allowed prior to
1413 * having configured keys.
1415 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1416 ieee80211_is_robust_mgmt_frame(
1417 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1425 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1427 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1428 struct net_device
*dev
= sdata
->dev
;
1429 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1431 if (ieee80211_has_a4(hdr
->frame_control
) &&
1432 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1435 if (is_multicast_ether_addr(hdr
->addr1
) &&
1436 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1437 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1440 return ieee80211_data_to_8023(rx
->skb
, dev
->dev_addr
, sdata
->vif
.type
);
1444 * requires that rx->skb is a frame with ethernet header
1446 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1448 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1449 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1450 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1453 * Allow EAPOL frames to us/the PAE group address regardless
1454 * of whether the frame was encrypted or not.
1456 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1457 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->dev
->dev_addr
) == 0 ||
1458 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1461 if (ieee80211_802_1x_port_control(rx
) ||
1462 ieee80211_drop_unencrypted(rx
, fc
))
1469 * requires that rx->skb is a frame with ethernet header
1472 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1474 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1475 struct net_device
*dev
= sdata
->dev
;
1476 struct ieee80211_local
*local
= rx
->local
;
1477 struct sk_buff
*skb
, *xmit_skb
;
1478 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1479 struct sta_info
*dsta
;
1484 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1485 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1486 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1487 (rx
->flags
& IEEE80211_RX_RA_MATCH
) &&
1488 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1489 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1491 * send multicast frames both to higher layers in
1492 * local net stack and back to the wireless medium
1494 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1495 if (!xmit_skb
&& net_ratelimit())
1496 printk(KERN_DEBUG
"%s: failed to clone "
1497 "multicast frame\n", dev
->name
);
1499 dsta
= sta_info_get(local
, skb
->data
);
1500 if (dsta
&& dsta
->sdata
->dev
== dev
) {
1502 * The destination station is associated to
1503 * this AP (in this VLAN), so send the frame
1504 * directly to it and do not pass it to local
1514 int align __maybe_unused
;
1516 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1518 * 'align' will only take the values 0 or 2 here
1519 * since all frames are required to be aligned
1520 * to 2-byte boundaries when being passed to
1521 * mac80211. That also explains the __skb_push()
1524 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1526 if (WARN_ON(skb_headroom(skb
) < 3)) {
1530 u8
*data
= skb
->data
;
1531 size_t len
= skb_headlen(skb
);
1533 memmove(skb
->data
, data
, len
);
1534 skb_set_tail_pointer(skb
, len
);
1540 /* deliver to local stack */
1541 skb
->protocol
= eth_type_trans(skb
, dev
);
1542 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1548 /* send to wireless media */
1549 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1550 skb_reset_network_header(xmit_skb
);
1551 skb_reset_mac_header(xmit_skb
);
1552 dev_queue_xmit(xmit_skb
);
1556 static ieee80211_rx_result debug_noinline
1557 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1559 struct net_device
*dev
= rx
->sdata
->dev
;
1560 struct ieee80211_local
*local
= rx
->local
;
1563 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1564 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1565 __le16 fc
= hdr
->frame_control
;
1566 const struct ethhdr
*eth
;
1571 if (unlikely(!ieee80211_is_data(fc
)))
1574 if (unlikely(!ieee80211_is_data_present(fc
)))
1575 return RX_DROP_MONITOR
;
1577 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1580 err
= __ieee80211_data_to_8023(rx
);
1582 return RX_DROP_UNUSABLE
;
1586 dev
->stats
.rx_packets
++;
1587 dev
->stats
.rx_bytes
+= skb
->len
;
1589 /* skip the wrapping header */
1590 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1592 return RX_DROP_UNUSABLE
;
1594 while (skb
!= frame
) {
1596 __be16 len
= eth
->h_proto
;
1597 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1599 remaining
= skb
->len
;
1600 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1601 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1603 padding
= ((4 - subframe_len
) & 0x3);
1604 /* the last MSDU has no padding */
1605 if (subframe_len
> remaining
)
1606 return RX_DROP_UNUSABLE
;
1608 skb_pull(skb
, sizeof(struct ethhdr
));
1609 /* if last subframe reuse skb */
1610 if (remaining
<= subframe_len
+ padding
)
1614 * Allocate and reserve two bytes more for payload
1615 * alignment since sizeof(struct ethhdr) is 14.
1617 frame
= dev_alloc_skb(
1618 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1622 return RX_DROP_UNUSABLE
;
1625 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1626 sizeof(struct ethhdr
) + 2);
1627 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1630 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1633 dev_kfree_skb(frame
);
1634 return RX_DROP_UNUSABLE
;
1638 skb_reset_network_header(frame
);
1640 frame
->priority
= skb
->priority
;
1643 payload
= frame
->data
;
1644 ethertype
= (payload
[6] << 8) | payload
[7];
1646 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1647 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1648 compare_ether_addr(payload
,
1649 bridge_tunnel_header
) == 0)) {
1650 /* remove RFC1042 or Bridge-Tunnel
1651 * encapsulation and replace EtherType */
1653 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1654 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1656 memcpy(skb_push(frame
, sizeof(__be16
)),
1657 &len
, sizeof(__be16
));
1658 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1659 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1662 if (!ieee80211_frame_allowed(rx
, fc
)) {
1663 if (skb
== frame
) /* last frame */
1664 return RX_DROP_UNUSABLE
;
1665 dev_kfree_skb(frame
);
1669 ieee80211_deliver_skb(rx
);
1675 #ifdef CONFIG_MAC80211_MESH
1676 static ieee80211_rx_result
1677 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1679 struct ieee80211_hdr
*hdr
;
1680 struct ieee80211s_hdr
*mesh_hdr
;
1681 unsigned int hdrlen
;
1682 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1683 struct ieee80211_local
*local
= rx
->local
;
1684 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1686 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1687 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1688 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1690 if (!ieee80211_is_data(hdr
->frame_control
))
1695 return RX_DROP_MONITOR
;
1697 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1698 struct mesh_path
*mppath
;
1702 if (is_multicast_ether_addr(hdr
->addr1
)) {
1703 mpp_addr
= hdr
->addr3
;
1704 proxied_addr
= mesh_hdr
->eaddr1
;
1706 mpp_addr
= hdr
->addr4
;
1707 proxied_addr
= mesh_hdr
->eaddr2
;
1711 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1713 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1715 spin_lock_bh(&mppath
->state_lock
);
1716 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1717 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1718 spin_unlock_bh(&mppath
->state_lock
);
1723 /* Frame has reached destination. Don't forward */
1724 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1725 compare_ether_addr(sdata
->dev
->dev_addr
, hdr
->addr3
) == 0)
1730 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1732 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1733 dropped_frames_ttl
);
1735 struct ieee80211_hdr
*fwd_hdr
;
1736 struct ieee80211_tx_info
*info
;
1738 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1740 if (!fwd_skb
&& net_ratelimit())
1741 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1744 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1745 memcpy(fwd_hdr
->addr2
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1746 info
= IEEE80211_SKB_CB(fwd_skb
);
1747 memset(info
, 0, sizeof(*info
));
1748 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1749 info
->control
.vif
= &rx
->sdata
->vif
;
1750 skb_set_queue_mapping(skb
,
1751 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1752 ieee80211_set_qos_hdr(local
, skb
);
1753 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1754 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1759 * Save TA to addr1 to send TA a path error if a
1760 * suitable next hop is not found
1762 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1764 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1765 /* Failed to immediately resolve next hop:
1766 * fwded frame was dropped or will be added
1767 * later to the pending skb queue. */
1769 return RX_DROP_MONITOR
;
1771 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1774 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1776 ieee80211_add_pending_skb(local
, fwd_skb
);
1780 if (is_multicast_ether_addr(hdr
->addr1
) ||
1781 sdata
->dev
->flags
& IFF_PROMISC
)
1784 return RX_DROP_MONITOR
;
1788 static ieee80211_rx_result debug_noinline
1789 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1791 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1792 struct ieee80211_local
*local
= rx
->local
;
1793 struct net_device
*dev
= sdata
->dev
;
1794 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1795 __le16 fc
= hdr
->frame_control
;
1798 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1801 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1802 return RX_DROP_MONITOR
;
1805 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1806 * that a 4-addr station can be detected and moved into a separate VLAN
1808 if (ieee80211_has_a4(hdr
->frame_control
) &&
1809 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1810 return RX_DROP_MONITOR
;
1812 err
= __ieee80211_data_to_8023(rx
);
1814 return RX_DROP_UNUSABLE
;
1816 if (!ieee80211_frame_allowed(rx
, fc
))
1817 return RX_DROP_MONITOR
;
1821 dev
->stats
.rx_packets
++;
1822 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1824 if (ieee80211_is_data(hdr
->frame_control
) &&
1825 !is_multicast_ether_addr(hdr
->addr1
) &&
1826 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1827 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1828 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1831 ieee80211_deliver_skb(rx
);
1836 static ieee80211_rx_result debug_noinline
1837 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1839 struct ieee80211_local
*local
= rx
->local
;
1840 struct ieee80211_hw
*hw
= &local
->hw
;
1841 struct sk_buff
*skb
= rx
->skb
;
1842 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1843 struct tid_ampdu_rx
*tid_agg_rx
;
1847 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1850 if (ieee80211_is_back_req(bar
->frame_control
)) {
1852 return RX_DROP_MONITOR
;
1853 tid
= le16_to_cpu(bar
->control
) >> 12;
1854 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1855 != HT_AGG_STATE_OPERATIONAL
)
1856 return RX_DROP_MONITOR
;
1857 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1859 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1861 /* reset session timer */
1862 if (tid_agg_rx
->timeout
)
1863 mod_timer(&tid_agg_rx
->session_timer
,
1864 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1866 /* release stored frames up to start of BAR */
1867 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1876 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1877 struct ieee80211_mgmt
*mgmt
,
1880 struct ieee80211_local
*local
= sdata
->local
;
1881 struct sk_buff
*skb
;
1882 struct ieee80211_mgmt
*resp
;
1884 if (compare_ether_addr(mgmt
->da
, sdata
->dev
->dev_addr
) != 0) {
1885 /* Not to own unicast address */
1889 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1890 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1891 /* Not from the current AP or not associated yet. */
1895 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1896 /* Too short SA Query request frame */
1900 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1904 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1905 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1906 memset(resp
, 0, 24);
1907 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1908 memcpy(resp
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1909 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1910 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1911 IEEE80211_STYPE_ACTION
);
1912 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1913 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1914 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1915 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1916 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1917 WLAN_SA_QUERY_TR_ID_LEN
);
1919 ieee80211_tx_skb(sdata
, skb
);
1922 static ieee80211_rx_result debug_noinline
1923 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1925 struct ieee80211_local
*local
= rx
->local
;
1926 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1927 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1928 int len
= rx
->skb
->len
;
1930 if (!ieee80211_is_action(mgmt
->frame_control
))
1934 return RX_DROP_MONITOR
;
1936 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1937 return RX_DROP_MONITOR
;
1939 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1940 return RX_DROP_MONITOR
;
1942 /* all categories we currently handle have action_code */
1943 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1944 return RX_DROP_MONITOR
;
1946 switch (mgmt
->u
.action
.category
) {
1947 case WLAN_CATEGORY_BACK
:
1949 * The aggregation code is not prepared to handle
1950 * anything but STA/AP due to the BSSID handling;
1951 * IBSS could work in the code but isn't supported
1952 * by drivers or the standard.
1954 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1955 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1956 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1957 return RX_DROP_MONITOR
;
1959 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1960 case WLAN_ACTION_ADDBA_REQ
:
1961 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1962 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1963 return RX_DROP_MONITOR
;
1964 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1966 case WLAN_ACTION_ADDBA_RESP
:
1967 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1968 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1969 return RX_DROP_MONITOR
;
1970 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1972 case WLAN_ACTION_DELBA
:
1973 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1974 sizeof(mgmt
->u
.action
.u
.delba
)))
1975 return RX_DROP_MONITOR
;
1976 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1980 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1981 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1982 return RX_DROP_MONITOR
;
1984 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1985 return RX_DROP_MONITOR
;
1987 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1988 case WLAN_ACTION_SPCT_MSR_REQ
:
1989 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1990 sizeof(mgmt
->u
.action
.u
.measurement
)))
1991 return RX_DROP_MONITOR
;
1992 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1994 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1995 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1996 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1997 return RX_DROP_MONITOR
;
1999 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2000 return RX_DROP_MONITOR
;
2002 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
2003 return RX_DROP_MONITOR
;
2005 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
2008 case WLAN_CATEGORY_SA_QUERY
:
2009 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
2010 sizeof(mgmt
->u
.action
.u
.sa_query
)))
2011 return RX_DROP_MONITOR
;
2012 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
2013 case WLAN_ACTION_SA_QUERY_REQUEST
:
2014 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
2015 return RX_DROP_MONITOR
;
2016 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
2018 case WLAN_ACTION_SA_QUERY_RESPONSE
:
2020 * SA Query response is currently only used in AP mode
2021 * and it is processed in user space.
2026 case WLAN_CATEGORY_MESH_PLINK
:
2027 case WLAN_CATEGORY_MESH_PATH_SEL
:
2028 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2029 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2032 /* do not process rejected action frames */
2033 if (mgmt
->u
.action
.category
& 0x80)
2034 return RX_DROP_MONITOR
;
2039 rx
->sta
->rx_packets
++;
2040 dev_kfree_skb(rx
->skb
);
2044 static ieee80211_rx_result debug_noinline
2045 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2047 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2048 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
2050 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
2051 return RX_DROP_MONITOR
;
2053 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
2054 return RX_DROP_MONITOR
;
2056 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2057 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2059 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2060 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
);
2062 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2063 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
2065 return RX_DROP_MONITOR
;
2068 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2069 struct ieee80211_rx_data
*rx
)
2072 unsigned int hdrlen
;
2074 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2075 if (rx
->skb
->len
>= hdrlen
+ 4)
2076 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2082 * Some hardware seem to generate incorrect Michael MIC
2083 * reports; ignore them to avoid triggering countermeasures.
2088 if (!ieee80211_has_protected(hdr
->frame_control
))
2091 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2093 * APs with pairwise keys should never receive Michael MIC
2094 * errors for non-zero keyidx because these are reserved for
2095 * group keys and only the AP is sending real multicast
2096 * frames in the BSS.
2101 if (!ieee80211_is_data(hdr
->frame_control
) &&
2102 !ieee80211_is_auth(hdr
->frame_control
))
2105 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2109 /* TODO: use IEEE80211_RX_FRAGMENTED */
2110 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2111 struct ieee80211_rate
*rate
)
2113 struct ieee80211_sub_if_data
*sdata
;
2114 struct ieee80211_local
*local
= rx
->local
;
2115 struct ieee80211_rtap_hdr
{
2116 struct ieee80211_radiotap_header hdr
;
2121 } __attribute__ ((packed
)) *rthdr
;
2122 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2123 struct net_device
*prev_dev
= NULL
;
2124 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2126 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2127 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2130 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2131 memset(rthdr
, 0, sizeof(*rthdr
));
2132 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2133 rthdr
->hdr
.it_present
=
2134 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2135 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2138 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2139 rthdr
->hdr
.it_present
|=
2140 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2142 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2144 if (status
->band
== IEEE80211_BAND_5GHZ
)
2145 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2146 IEEE80211_CHAN_5GHZ
);
2148 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2149 IEEE80211_CHAN_2GHZ
);
2151 skb_set_mac_header(skb
, 0);
2152 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2153 skb
->pkt_type
= PACKET_OTHERHOST
;
2154 skb
->protocol
= htons(ETH_P_802_2
);
2156 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2157 if (!netif_running(sdata
->dev
))
2160 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2161 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2165 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2167 skb2
->dev
= prev_dev
;
2172 prev_dev
= sdata
->dev
;
2173 sdata
->dev
->stats
.rx_packets
++;
2174 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2178 skb
->dev
= prev_dev
;
2191 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2192 struct ieee80211_rx_data
*rx
,
2193 struct sk_buff
*skb
,
2194 struct ieee80211_rate
*rate
)
2196 struct sk_buff_head reorder_release
;
2197 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2199 __skb_queue_head_init(&reorder_release
);
2204 #define CALL_RXH(rxh) \
2207 if (res != RX_CONTINUE) \
2212 * NB: the rxh_next label works even if we jump
2213 * to it from here because then the list will
2214 * be empty, which is a trivial check
2216 CALL_RXH(ieee80211_rx_h_passive_scan
)
2217 CALL_RXH(ieee80211_rx_h_check
)
2219 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2221 while ((skb
= __skb_dequeue(&reorder_release
))) {
2223 * all the other fields are valid across frames
2224 * that belong to an aMPDU since they are on the
2225 * same TID from the same station
2229 CALL_RXH(ieee80211_rx_h_decrypt
)
2230 CALL_RXH(ieee80211_rx_h_check_more_data
)
2231 CALL_RXH(ieee80211_rx_h_sta_process
)
2232 CALL_RXH(ieee80211_rx_h_defragment
)
2233 CALL_RXH(ieee80211_rx_h_ps_poll
)
2234 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2235 /* must be after MMIC verify so header is counted in MPDU mic */
2236 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2237 CALL_RXH(ieee80211_rx_h_amsdu
)
2238 #ifdef CONFIG_MAC80211_MESH
2239 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2240 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2242 CALL_RXH(ieee80211_rx_h_data
)
2244 /* special treatment -- needs the queue */
2245 res
= ieee80211_rx_h_ctrl(rx
, &reorder_release
);
2246 if (res
!= RX_CONTINUE
)
2249 CALL_RXH(ieee80211_rx_h_action
)
2250 CALL_RXH(ieee80211_rx_h_mgmt
)
2256 case RX_DROP_MONITOR
:
2257 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2259 rx
->sta
->rx_dropped
++;
2262 ieee80211_rx_cooked_monitor(rx
, rate
);
2264 case RX_DROP_UNUSABLE
:
2265 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2267 rx
->sta
->rx_dropped
++;
2268 dev_kfree_skb(rx
->skb
);
2271 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2277 /* main receive path */
2279 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2280 struct ieee80211_rx_data
*rx
,
2281 struct ieee80211_hdr
*hdr
)
2283 struct sk_buff
*skb
= rx
->skb
;
2284 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2285 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2286 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2288 switch (sdata
->vif
.type
) {
2289 case NL80211_IFTYPE_STATION
:
2290 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2293 compare_ether_addr(sdata
->dev
->dev_addr
, hdr
->addr1
) != 0) {
2294 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2296 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2299 case NL80211_IFTYPE_ADHOC
:
2302 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2305 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2306 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2308 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2309 } else if (!multicast
&&
2310 compare_ether_addr(sdata
->dev
->dev_addr
,
2312 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2314 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2315 } else if (!rx
->sta
) {
2317 if (status
->flag
& RX_FLAG_HT
)
2318 rate_idx
= 0; /* TODO: HT rates */
2320 rate_idx
= status
->rate_idx
;
2321 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
, hdr
->addr2
,
2325 case NL80211_IFTYPE_MESH_POINT
:
2327 compare_ether_addr(sdata
->dev
->dev_addr
,
2329 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2332 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2335 case NL80211_IFTYPE_AP_VLAN
:
2336 case NL80211_IFTYPE_AP
:
2338 if (compare_ether_addr(sdata
->dev
->dev_addr
,
2341 } else if (!ieee80211_bssid_match(bssid
,
2342 sdata
->dev
->dev_addr
)) {
2343 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2345 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2348 case NL80211_IFTYPE_WDS
:
2349 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2351 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2354 case NL80211_IFTYPE_MONITOR
:
2355 case NL80211_IFTYPE_UNSPECIFIED
:
2356 case __NL80211_IFTYPE_AFTER_LAST
:
2357 /* should never get here */
2360 case MESH_PLINK_CATEGORY
:
2361 case MESH_PATH_SEL_CATEGORY
:
2362 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2363 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2371 * This is the actual Rx frames handler. as it blongs to Rx path it must
2372 * be called with rcu_read_lock protection.
2374 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2375 struct sk_buff
*skb
,
2376 struct ieee80211_rate
*rate
)
2378 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2379 struct ieee80211_local
*local
= hw_to_local(hw
);
2380 struct ieee80211_sub_if_data
*sdata
;
2381 struct ieee80211_hdr
*hdr
;
2382 struct ieee80211_rx_data rx
;
2384 struct ieee80211_sub_if_data
*prev
= NULL
;
2385 struct sk_buff
*skb_new
;
2387 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2388 memset(&rx
, 0, sizeof(rx
));
2392 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2393 local
->dot11ReceivedFragmentCount
++;
2395 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2396 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2397 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2399 ieee80211_parse_qos(&rx
);
2400 ieee80211_verify_alignment(&rx
);
2402 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
2404 rx
.sdata
= rx
.sta
->sdata
;
2406 if (rx
.sdata
&& ieee80211_is_data(hdr
->frame_control
)) {
2407 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2408 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2410 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2411 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2412 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2416 } else list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2417 if (!netif_running(sdata
->dev
))
2420 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2421 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2424 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2425 prepares
= prepare_for_handlers(sdata
, &rx
, hdr
);
2430 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2432 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2433 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2438 * frame is destined for this interface, but if it's not
2439 * also for the previous one we handle that after the
2440 * loop to avoid copying the SKB once too much
2449 * frame was destined for the previous interface
2450 * so invoke RX handlers for it
2453 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2455 if (net_ratelimit())
2456 printk(KERN_DEBUG
"%s: failed to copy "
2457 "multicast frame for %s\n",
2458 wiphy_name(local
->hw
.wiphy
),
2462 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
, rate
);
2466 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
, rate
);
2472 * This is the receive path handler. It is called by a low level driver when an
2473 * 802.11 MPDU is received from the hardware.
2475 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2477 struct ieee80211_local
*local
= hw_to_local(hw
);
2478 struct ieee80211_rate
*rate
= NULL
;
2479 struct ieee80211_supported_band
*sband
;
2480 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2482 WARN_ON_ONCE(softirq_count() == 0);
2484 if (WARN_ON(status
->band
< 0 ||
2485 status
->band
>= IEEE80211_NUM_BANDS
))
2488 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2489 if (WARN_ON(!sband
))
2493 * If we're suspending, it is possible although not too likely
2494 * that we'd be receiving frames after having already partially
2495 * quiesced the stack. We can't process such frames then since
2496 * that might, for example, cause stations to be added or other
2497 * driver callbacks be invoked.
2499 if (unlikely(local
->quiescing
|| local
->suspended
))
2503 * The same happens when we're not even started,
2504 * but that's worth a warning.
2506 if (WARN_ON(!local
->started
))
2509 if (status
->flag
& RX_FLAG_HT
) {
2511 * rate_idx is MCS index, which can be [0-76] as documented on:
2513 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2515 * Anything else would be some sort of driver or hardware error.
2516 * The driver should catch hardware errors.
2518 if (WARN((status
->rate_idx
< 0 ||
2519 status
->rate_idx
> 76),
2520 "Rate marked as an HT rate but passed "
2521 "status->rate_idx is not "
2522 "an MCS index [0-76]: %d (0x%02x)\n",
2527 if (WARN_ON(status
->rate_idx
< 0 ||
2528 status
->rate_idx
>= sband
->n_bitrates
))
2530 rate
= &sband
->bitrates
[status
->rate_idx
];
2534 * key references and virtual interfaces are protected using RCU
2535 * and this requires that we are in a read-side RCU section during
2536 * receive processing
2541 * Frames with failed FCS/PLCP checksum are not returned,
2542 * all other frames are returned without radiotap header
2543 * if it was previously present.
2544 * Also, frames with less than 16 bytes are dropped.
2546 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2552 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2560 EXPORT_SYMBOL(ieee80211_rx
);
2562 /* This is a version of the rx handler that can be called from hard irq
2563 * context. Post the skb on the queue and schedule the tasklet */
2564 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2566 struct ieee80211_local
*local
= hw_to_local(hw
);
2568 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2570 skb
->pkt_type
= IEEE80211_RX_MSG
;
2571 skb_queue_tail(&local
->skb_queue
, skb
);
2572 tasklet_schedule(&local
->tasklet
);
2574 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);