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 __pskb_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_LOCK_QUALITY is missing */
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos
= status
->antenna
;
187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
191 if ((pos
- (u8
*)rthdr
) & 1)
193 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
194 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
195 put_unaligned_le16(rx_flags
, pos
);
200 * This function copies a received frame to all monitor interfaces and
201 * returns a cleaned-up SKB that no longer includes the FCS nor the
202 * radiotap header the driver might have added.
204 static struct sk_buff
*
205 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
206 struct ieee80211_rate
*rate
)
208 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
209 struct ieee80211_sub_if_data
*sdata
;
210 int needed_headroom
= 0;
211 struct sk_buff
*skb
, *skb2
;
212 struct net_device
*prev_dev
= NULL
;
213 int present_fcs_len
= 0;
216 * First, we may need to make a copy of the skb because
217 * (1) we need to modify it for radiotap (if not present), and
218 * (2) the other RX handlers will modify the skb we got.
220 * We don't need to, of course, if we aren't going to return
221 * the SKB because it has a bad FCS/PLCP checksum.
224 /* room for the radiotap header based on driver features */
225 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
227 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
228 present_fcs_len
= FCS_LEN
;
230 /* make sure hdr->frame_control is on the linear part */
231 if (!pskb_may_pull(origskb
, 2)) {
232 dev_kfree_skb(origskb
);
236 if (!local
->monitors
) {
237 if (should_drop_frame(origskb
, present_fcs_len
)) {
238 dev_kfree_skb(origskb
);
242 return remove_monitor_info(local
, origskb
);
245 if (should_drop_frame(origskb
, present_fcs_len
)) {
246 /* only need to expand headroom if necessary */
251 * This shouldn't trigger often because most devices have an
252 * RX header they pull before we get here, and that should
253 * be big enough for our radiotap information. We should
254 * probably export the length to drivers so that we can have
255 * them allocate enough headroom to start with.
257 if (skb_headroom(skb
) < needed_headroom
&&
258 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
264 * Need to make a copy and possibly remove radiotap header
265 * and FCS from the original.
267 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
269 origskb
= remove_monitor_info(local
, origskb
);
275 /* prepend radiotap information */
276 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
278 skb_reset_mac_header(skb
);
279 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
280 skb
->pkt_type
= PACKET_OTHERHOST
;
281 skb
->protocol
= htons(ETH_P_802_2
);
283 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
284 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
287 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
290 if (!ieee80211_sdata_running(sdata
))
294 skb2
= skb_clone(skb
, GFP_ATOMIC
);
296 skb2
->dev
= prev_dev
;
301 prev_dev
= sdata
->dev
;
302 sdata
->dev
->stats
.rx_packets
++;
303 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
316 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
318 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
321 /* does the frame have a qos control field? */
322 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
323 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
324 /* frame has qos control */
325 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
326 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
327 rx
->flags
|= IEEE80211_RX_AMSDU
;
329 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
332 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
334 * Sequence numbers for management frames, QoS data
335 * frames with a broadcast/multicast address in the
336 * Address 1 field, and all non-QoS data frames sent
337 * by QoS STAs are assigned using an additional single
338 * modulo-4096 counter, [...]
340 * We also use that counter for non-QoS STAs.
342 tid
= NUM_RX_DATA_QUEUES
- 1;
346 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
347 * For now, set skb->priority to 0 for other cases. */
348 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
352 * DOC: Packet alignment
354 * Drivers always need to pass packets that are aligned to two-byte boundaries
357 * Additionally, should, if possible, align the payload data in a way that
358 * guarantees that the contained IP header is aligned to a four-byte
359 * boundary. In the case of regular frames, this simply means aligning the
360 * payload to a four-byte boundary (because either the IP header is directly
361 * contained, or IV/RFC1042 headers that have a length divisible by four are
362 * in front of it). If the payload data is not properly aligned and the
363 * architecture doesn't support efficient unaligned operations, mac80211
364 * will align the data.
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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
379 WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
380 "unaligned packet at 0x%p\n", rx
->skb
->data
);
387 static ieee80211_rx_result debug_noinline
388 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
390 struct ieee80211_local
*local
= rx
->local
;
391 struct sk_buff
*skb
= rx
->skb
;
393 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
394 return ieee80211_scan_rx(rx
->sdata
, skb
);
396 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
397 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
398 /* drop all the other packets during a software scan anyway */
399 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
404 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
407 return RX_DROP_UNUSABLE
;
414 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
416 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
418 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
421 return ieee80211_is_robust_mgmt_frame(hdr
);
425 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
427 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
429 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
432 return ieee80211_is_robust_mgmt_frame(hdr
);
436 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
437 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
439 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
440 struct ieee80211_mmie
*mmie
;
442 if (skb
->len
< 24 + sizeof(*mmie
) ||
443 !is_multicast_ether_addr(hdr
->da
))
446 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
447 return -1; /* not a robust management frame */
449 mmie
= (struct ieee80211_mmie
*)
450 (skb
->data
+ skb
->len
- sizeof(*mmie
));
451 if (mmie
->element_id
!= WLAN_EID_MMIE
||
452 mmie
->length
!= sizeof(*mmie
) - 2)
455 return le16_to_cpu(mmie
->key_id
);
459 static ieee80211_rx_result
460 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
462 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
463 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
464 char *dev_addr
= rx
->sdata
->vif
.addr
;
466 if (ieee80211_is_data(hdr
->frame_control
)) {
467 if (is_multicast_ether_addr(hdr
->addr1
)) {
468 if (ieee80211_has_tods(hdr
->frame_control
) ||
469 !ieee80211_has_fromds(hdr
->frame_control
))
470 return RX_DROP_MONITOR
;
471 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
472 return RX_DROP_MONITOR
;
474 if (!ieee80211_has_a4(hdr
->frame_control
))
475 return RX_DROP_MONITOR
;
476 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
477 return RX_DROP_MONITOR
;
481 /* If there is not an established peer link and this is not a peer link
482 * establisment frame, beacon or probe, drop the frame.
485 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
486 struct ieee80211_mgmt
*mgmt
;
488 if (!ieee80211_is_mgmt(hdr
->frame_control
))
489 return RX_DROP_MONITOR
;
491 if (ieee80211_is_action(hdr
->frame_control
)) {
492 mgmt
= (struct ieee80211_mgmt
*)hdr
;
493 if (mgmt
->u
.action
.category
!= WLAN_CATEGORY_MESH_PLINK
)
494 return RX_DROP_MONITOR
;
498 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
499 ieee80211_is_probe_resp(hdr
->frame_control
) ||
500 ieee80211_is_beacon(hdr
->frame_control
))
503 return RX_DROP_MONITOR
;
507 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
509 if (ieee80211_is_data(hdr
->frame_control
) &&
510 is_multicast_ether_addr(hdr
->addr1
) &&
511 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
512 return RX_DROP_MONITOR
;
518 #define SEQ_MODULO 0x1000
519 #define SEQ_MASK 0xfff
521 static inline int seq_less(u16 sq1
, u16 sq2
)
523 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
526 static inline u16
seq_inc(u16 sq
)
528 return (sq
+ 1) & SEQ_MASK
;
531 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
533 return (sq1
- sq2
) & SEQ_MASK
;
537 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
538 struct tid_ampdu_rx
*tid_agg_rx
,
540 struct sk_buff_head
*frames
)
542 struct ieee80211_supported_band
*sband
;
543 struct ieee80211_rate
*rate
= NULL
;
544 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
545 struct ieee80211_rx_status
*status
;
550 status
= IEEE80211_SKB_RXCB(skb
);
552 /* release the reordered frames to stack */
553 sband
= hw
->wiphy
->bands
[status
->band
];
554 if (!(status
->flag
& RX_FLAG_HT
))
555 rate
= &sband
->bitrates
[status
->rate_idx
];
556 tid_agg_rx
->stored_mpdu_num
--;
557 tid_agg_rx
->reorder_buf
[index
] = NULL
;
558 __skb_queue_tail(frames
, skb
);
561 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
564 static void ieee80211_release_reorder_frames(struct ieee80211_hw
*hw
,
565 struct tid_ampdu_rx
*tid_agg_rx
,
567 struct sk_buff_head
*frames
)
571 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
572 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
573 tid_agg_rx
->buf_size
;
574 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
579 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
580 * the skb was added to the buffer longer than this time ago, the earlier
581 * frames that have not yet been received are assumed to be lost and the skb
582 * can be released for processing. This may also release other skb's from the
583 * reorder buffer if there are no additional gaps between the frames.
585 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
588 * As this function belongs to the RX path it must be under
589 * rcu_read_lock protection. It returns false if the frame
590 * can be processed immediately, true if it was consumed.
592 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
593 struct tid_ampdu_rx
*tid_agg_rx
,
595 struct sk_buff_head
*frames
)
597 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
598 u16 sc
= le16_to_cpu(hdr
->seq_ctrl
);
599 u16 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
600 u16 head_seq_num
, buf_size
;
603 buf_size
= tid_agg_rx
->buf_size
;
604 head_seq_num
= tid_agg_rx
->head_seq_num
;
606 /* frame with out of date sequence number */
607 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
613 * If frame the sequence number exceeds our buffering window
614 * size release some previous frames to make room for this one.
616 if (!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) {
617 head_seq_num
= seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
618 /* release stored frames up to new head to stack */
619 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, head_seq_num
,
623 /* Now the new frame is always in the range of the reordering buffer */
625 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
627 /* check if we already stored this frame */
628 if (tid_agg_rx
->reorder_buf
[index
]) {
634 * If the current MPDU is in the right order and nothing else
635 * is stored we can process it directly, no need to buffer it.
637 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
638 tid_agg_rx
->stored_mpdu_num
== 0) {
639 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
643 /* put the frame in the reordering buffer */
644 tid_agg_rx
->reorder_buf
[index
] = skb
;
645 tid_agg_rx
->reorder_time
[index
] = jiffies
;
646 tid_agg_rx
->stored_mpdu_num
++;
647 /* release the buffer until next missing frame */
648 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
649 tid_agg_rx
->buf_size
;
650 if (!tid_agg_rx
->reorder_buf
[index
] &&
651 tid_agg_rx
->stored_mpdu_num
> 1) {
653 * No buffers ready to be released, but check whether any
654 * frames in the reorder buffer have timed out.
658 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
659 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
660 if (!tid_agg_rx
->reorder_buf
[j
]) {
664 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
665 HT_RX_REORDER_BUF_TIMEOUT
))
668 #ifdef CONFIG_MAC80211_HT_DEBUG
670 printk(KERN_DEBUG
"%s: release an RX reorder "
671 "frame due to timeout on earlier "
673 wiphy_name(hw
->wiphy
));
675 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
679 * Increment the head seq# also for the skipped slots.
681 tid_agg_rx
->head_seq_num
=
682 (tid_agg_rx
->head_seq_num
+ skipped
) & SEQ_MASK
;
685 } else while (tid_agg_rx
->reorder_buf
[index
]) {
686 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
, frames
);
687 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
) %
688 tid_agg_rx
->buf_size
;
695 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
696 * true if the MPDU was buffered, false if it should be processed.
698 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data
*rx
,
699 struct sk_buff_head
*frames
)
701 struct sk_buff
*skb
= rx
->skb
;
702 struct ieee80211_local
*local
= rx
->local
;
703 struct ieee80211_hw
*hw
= &local
->hw
;
704 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
705 struct sta_info
*sta
= rx
->sta
;
706 struct tid_ampdu_rx
*tid_agg_rx
;
710 if (!ieee80211_is_data_qos(hdr
->frame_control
))
714 * filter the QoS data rx stream according to
715 * STA/TID and check if this STA/TID is on aggregation
721 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
723 spin_lock(&sta
->lock
);
725 if (!sta
->ampdu_mlme
.tid_active_rx
[tid
])
726 goto dont_reorder_unlock
;
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
)))
732 goto dont_reorder_unlock
;
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 spin_unlock(&sta
->lock
);
745 __ieee80211_stop_rx_ba_session(sta
, tid
, WLAN_BACK_RECIPIENT
,
746 WLAN_REASON_QSTA_REQUIRE_SETUP
);
751 if (ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, frames
)) {
752 spin_unlock(&sta
->lock
);
757 spin_unlock(&sta
->lock
);
759 __skb_queue_tail(frames
, skb
);
762 static ieee80211_rx_result debug_noinline
763 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
765 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
767 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
768 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
769 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
770 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
772 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
773 rx
->local
->dot11FrameDuplicateCount
++;
774 rx
->sta
->num_duplicates
++;
776 return RX_DROP_MONITOR
;
778 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
781 if (unlikely(rx
->skb
->len
< 16)) {
782 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
783 return RX_DROP_MONITOR
;
786 /* Drop disallowed frame classes based on STA auth/assoc state;
787 * IEEE 802.11, Chap 5.5.
789 * mac80211 filters only based on association state, i.e. it drops
790 * Class 3 frames from not associated stations. hostapd sends
791 * deauth/disassoc frames when needed. In addition, hostapd is
792 * responsible for filtering on both auth and assoc states.
795 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
796 return ieee80211_rx_mesh_check(rx
);
798 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
799 ieee80211_is_pspoll(hdr
->frame_control
)) &&
800 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
801 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
802 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
803 !ieee80211_has_tods(hdr
->frame_control
) &&
804 ieee80211_is_data(hdr
->frame_control
)) ||
805 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
806 /* Drop IBSS frames and frames for other hosts
808 return RX_DROP_MONITOR
;
811 return RX_DROP_MONITOR
;
818 static ieee80211_rx_result debug_noinline
819 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
821 struct sk_buff
*skb
= rx
->skb
;
822 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
823 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
826 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
827 struct ieee80211_key
*stakey
= NULL
;
828 int mmie_keyidx
= -1;
833 * There are four types of keys:
835 * - IGTK (group keys for management frames)
836 * - PTK (pairwise keys)
837 * - STK (station-to-station pairwise keys)
839 * When selecting a key, we have to distinguish between multicast
840 * (including broadcast) and unicast frames, the latter can only
841 * use PTKs and STKs while the former always use GTKs and IGTKs.
842 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
843 * unicast frames can also use key indices like GTKs. Hence, if we
844 * don't have a PTK/STK we check the key index for a WEP key.
846 * Note that in a regular BSS, multicast frames are sent by the
847 * AP only, associated stations unicast the frame to the AP first
848 * which then multicasts it on their behalf.
850 * There is also a slight problem in IBSS mode: GTKs are negotiated
851 * with each station, that is something we don't currently handle.
852 * The spec seems to expect that one negotiates the same key with
853 * every station but there's no such requirement; VLANs could be
858 * No point in finding a key and decrypting if the frame is neither
859 * addressed to us nor a multicast frame.
861 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
864 /* start without a key */
868 stakey
= rcu_dereference(rx
->sta
->key
);
870 if (!ieee80211_has_protected(hdr
->frame_control
))
871 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
873 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
875 /* Skip decryption if the frame is not protected. */
876 if (!ieee80211_has_protected(hdr
->frame_control
))
878 } else if (mmie_keyidx
>= 0) {
879 /* Broadcast/multicast robust management frame / BIP */
880 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
881 (status
->flag
& RX_FLAG_IV_STRIPPED
))
884 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
885 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
886 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
887 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
888 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
890 * The frame was not protected, so skip decryption. However, we
891 * need to set rx->key if there is a key that could have been
892 * used so that the frame may be dropped if encryption would
893 * have been expected.
895 struct ieee80211_key
*key
= NULL
;
896 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
897 is_multicast_ether_addr(hdr
->addr1
) &&
898 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
900 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
906 * The device doesn't give us the IV so we won't be
907 * able to look up the key. That's ok though, we
908 * don't need to decrypt the frame, we just won't
909 * be able to keep statistics accurate.
910 * Except for key threshold notifications, should
911 * we somehow allow the driver to tell us which key
912 * the hardware used if this flag is set?
914 if ((status
->flag
& RX_FLAG_DECRYPTED
) &&
915 (status
->flag
& RX_FLAG_IV_STRIPPED
))
918 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
920 if (rx
->skb
->len
< 8 + hdrlen
)
921 return RX_DROP_UNUSABLE
; /* TODO: count this? */
924 * no need to call ieee80211_wep_get_keyidx,
925 * it verifies a bunch of things we've done already
927 skb_copy_bits(rx
->skb
, hdrlen
+ 3, &keyid
, 1);
930 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
933 * RSNA-protected unicast frames should always be sent with
934 * pairwise or station-to-station keys, but for WEP we allow
935 * using a key index as well.
937 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
938 !is_multicast_ether_addr(hdr
->addr1
))
943 rx
->key
->tx_rx_count
++;
944 /* TODO: add threshold stuff again */
946 return RX_DROP_MONITOR
;
949 if (skb_linearize(rx
->skb
))
950 return RX_DROP_UNUSABLE
;
952 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
954 /* Check for weak IVs if possible */
955 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
956 ieee80211_is_data(hdr
->frame_control
) &&
957 (!(status
->flag
& RX_FLAG_IV_STRIPPED
) ||
958 !(status
->flag
& RX_FLAG_DECRYPTED
)) &&
959 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
960 rx
->sta
->wep_weak_iv_count
++;
962 switch (rx
->key
->conf
.alg
) {
964 result
= ieee80211_crypto_wep_decrypt(rx
);
967 result
= ieee80211_crypto_tkip_decrypt(rx
);
970 result
= ieee80211_crypto_ccmp_decrypt(rx
);
973 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
977 /* either the frame has been decrypted or will be dropped */
978 status
->flag
|= RX_FLAG_DECRYPTED
;
983 static ieee80211_rx_result debug_noinline
984 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
986 struct ieee80211_local
*local
;
987 struct ieee80211_hdr
*hdr
;
992 hdr
= (struct ieee80211_hdr
*) skb
->data
;
994 if (!local
->pspolling
)
997 if (!ieee80211_has_fromds(hdr
->frame_control
))
998 /* this is not from AP */
1001 if (!ieee80211_is_data(hdr
->frame_control
))
1004 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
1005 /* AP has no more frames buffered for us */
1006 local
->pspolling
= false;
1010 /* more data bit is set, let's request a new frame from the AP */
1011 ieee80211_send_pspoll(local
, rx
->sdata
);
1016 static void ap_sta_ps_start(struct sta_info
*sta
)
1018 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1019 struct ieee80211_local
*local
= sdata
->local
;
1021 atomic_inc(&sdata
->bss
->num_sta_ps
);
1022 set_sta_flags(sta
, WLAN_STA_PS_STA
);
1023 drv_sta_notify(local
, sdata
, STA_NOTIFY_SLEEP
, &sta
->sta
);
1024 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1025 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
1026 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1027 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1030 static void ap_sta_ps_end(struct sta_info
*sta
)
1032 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1034 atomic_dec(&sdata
->bss
->num_sta_ps
);
1036 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
1038 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1039 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
1040 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1041 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1043 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
1044 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1045 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
1046 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
1047 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1051 ieee80211_sta_ps_deliver_wakeup(sta
);
1054 static ieee80211_rx_result debug_noinline
1055 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
1057 struct sta_info
*sta
= rx
->sta
;
1058 struct sk_buff
*skb
= rx
->skb
;
1059 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1060 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1066 * Update last_rx only for IBSS packets which are for the current
1067 * BSSID to avoid keeping the current IBSS network alive in cases
1068 * where other STAs start using different BSSID.
1070 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
1071 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
1072 NL80211_IFTYPE_ADHOC
);
1073 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
1074 sta
->last_rx
= jiffies
;
1075 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
1077 * Mesh beacons will update last_rx when if they are found to
1078 * match the current local configuration when processed.
1080 sta
->last_rx
= jiffies
;
1083 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1086 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1087 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
1089 sta
->rx_fragments
++;
1090 sta
->rx_bytes
+= rx
->skb
->len
;
1091 sta
->last_signal
= status
->signal
;
1094 * Change STA power saving mode only at the end of a frame
1095 * exchange sequence.
1097 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
1098 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1099 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
1100 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
1102 * Ignore doze->wake transitions that are
1103 * indicated by non-data frames, the standard
1104 * is unclear here, but for example going to
1105 * PS mode and then scanning would cause a
1106 * doze->wake transition for the probe request,
1107 * and that is clearly undesirable.
1109 if (ieee80211_is_data(hdr
->frame_control
) &&
1110 !ieee80211_has_pm(hdr
->frame_control
))
1113 if (ieee80211_has_pm(hdr
->frame_control
))
1114 ap_sta_ps_start(sta
);
1119 * Drop (qos-)data::nullfunc frames silently, since they
1120 * are used only to control station power saving mode.
1122 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
1123 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
1124 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
1127 * If we receive a 4-addr nullfunc frame from a STA
1128 * that was not moved to a 4-addr STA vlan yet, drop
1129 * the frame to the monitor interface, to make sure
1130 * that hostapd sees it
1132 if (ieee80211_has_a4(hdr
->frame_control
) &&
1133 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1134 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1135 !rx
->sdata
->u
.vlan
.sta
)))
1136 return RX_DROP_MONITOR
;
1138 * Update counter and free packet here to avoid
1139 * counting this as a dropped packed.
1142 dev_kfree_skb(rx
->skb
);
1147 } /* ieee80211_rx_h_sta_process */
1149 static inline struct ieee80211_fragment_entry
*
1150 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
1151 unsigned int frag
, unsigned int seq
, int rx_queue
,
1152 struct sk_buff
**skb
)
1154 struct ieee80211_fragment_entry
*entry
;
1157 idx
= sdata
->fragment_next
;
1158 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
1159 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
1160 sdata
->fragment_next
= 0;
1162 if (!skb_queue_empty(&entry
->skb_list
)) {
1163 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1164 struct ieee80211_hdr
*hdr
=
1165 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
1166 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
1167 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1168 "addr1=%pM addr2=%pM\n",
1170 jiffies
- entry
->first_frag_time
, entry
->seq
,
1171 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
1173 __skb_queue_purge(&entry
->skb_list
);
1176 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
1178 entry
->first_frag_time
= jiffies
;
1180 entry
->rx_queue
= rx_queue
;
1181 entry
->last_frag
= frag
;
1183 entry
->extra_len
= 0;
1188 static inline struct ieee80211_fragment_entry
*
1189 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
1190 unsigned int frag
, unsigned int seq
,
1191 int rx_queue
, struct ieee80211_hdr
*hdr
)
1193 struct ieee80211_fragment_entry
*entry
;
1196 idx
= sdata
->fragment_next
;
1197 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
1198 struct ieee80211_hdr
*f_hdr
;
1202 idx
= IEEE80211_FRAGMENT_MAX
- 1;
1204 entry
= &sdata
->fragments
[idx
];
1205 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
1206 entry
->rx_queue
!= rx_queue
||
1207 entry
->last_frag
+ 1 != frag
)
1210 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
1213 * Check ftype and addresses are equal, else check next fragment
1215 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
1216 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
1217 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
1218 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
1221 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
1222 __skb_queue_purge(&entry
->skb_list
);
1231 static ieee80211_rx_result debug_noinline
1232 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1234 struct ieee80211_hdr
*hdr
;
1237 unsigned int frag
, seq
;
1238 struct ieee80211_fragment_entry
*entry
;
1239 struct sk_buff
*skb
;
1241 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1242 fc
= hdr
->frame_control
;
1243 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1244 frag
= sc
& IEEE80211_SCTL_FRAG
;
1246 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1247 (rx
->skb
)->len
< 24 ||
1248 is_multicast_ether_addr(hdr
->addr1
))) {
1249 /* not fragmented */
1252 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1254 if (skb_linearize(rx
->skb
))
1255 return RX_DROP_UNUSABLE
;
1257 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1260 /* This is the first fragment of a new frame. */
1261 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1262 rx
->queue
, &(rx
->skb
));
1263 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1264 ieee80211_has_protected(fc
)) {
1265 /* Store CCMP PN so that we can verify that the next
1266 * fragment has a sequential PN value. */
1268 memcpy(entry
->last_pn
,
1269 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1275 /* This is a fragment for a frame that should already be pending in
1276 * fragment cache. Add this fragment to the end of the pending entry.
1278 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1280 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1281 return RX_DROP_MONITOR
;
1284 /* Verify that MPDUs within one MSDU have sequential PN values.
1285 * (IEEE 802.11i, 8.3.3.4.5) */
1288 u8 pn
[CCMP_PN_LEN
], *rpn
;
1289 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1290 return RX_DROP_UNUSABLE
;
1291 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1292 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1297 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1298 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1299 return RX_DROP_UNUSABLE
;
1300 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1303 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1304 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1305 entry
->last_frag
= frag
;
1306 entry
->extra_len
+= rx
->skb
->len
;
1307 if (ieee80211_has_morefrags(fc
)) {
1312 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1313 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1314 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1315 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1317 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1318 __skb_queue_purge(&entry
->skb_list
);
1319 return RX_DROP_UNUSABLE
;
1322 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1323 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1327 /* Complete frame has been reassembled - process it now */
1328 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1332 rx
->sta
->rx_packets
++;
1333 if (is_multicast_ether_addr(hdr
->addr1
))
1334 rx
->local
->dot11MulticastReceivedFrameCount
++;
1336 ieee80211_led_rx(rx
->local
);
1340 static ieee80211_rx_result debug_noinline
1341 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1343 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1344 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1346 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1347 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1350 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1351 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1352 return RX_DROP_UNUSABLE
;
1354 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1355 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1357 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1359 /* Free PS Poll skb here instead of returning RX_DROP that would
1360 * count as an dropped frame. */
1361 dev_kfree_skb(rx
->skb
);
1366 static ieee80211_rx_result debug_noinline
1367 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1369 u8
*data
= rx
->skb
->data
;
1370 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1372 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1375 /* remove the qos control field, update frame type and meta-data */
1376 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1377 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1378 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1379 /* change frame type to non QOS */
1380 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1386 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1388 if (unlikely(!rx
->sta
||
1389 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1396 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1398 struct sk_buff
*skb
= rx
->skb
;
1399 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1402 * Pass through unencrypted frames if the hardware has
1403 * decrypted them already.
1405 if (status
->flag
& RX_FLAG_DECRYPTED
)
1408 /* Drop unencrypted frames if key is set. */
1409 if (unlikely(!ieee80211_has_protected(fc
) &&
1410 !ieee80211_is_nullfunc(fc
) &&
1411 ieee80211_is_data(fc
) &&
1412 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1419 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data
*rx
)
1421 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1422 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(rx
->skb
);
1423 __le16 fc
= hdr
->frame_control
;
1426 * Pass through unencrypted frames if the hardware has
1427 * decrypted them already.
1429 if (status
->flag
& RX_FLAG_DECRYPTED
)
1432 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1433 if (unlikely(!ieee80211_has_protected(fc
) &&
1434 ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1437 /* BIP does not use Protected field, so need to check MMIE */
1438 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1439 ieee80211_get_mmie_keyidx(rx
->skb
) < 0))
1442 * When using MFP, Action frames are not allowed prior to
1443 * having configured keys.
1445 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1446 ieee80211_is_robust_mgmt_frame(
1447 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1455 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1457 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1458 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1460 if (ieee80211_has_a4(hdr
->frame_control
) &&
1461 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->u
.vlan
.sta
)
1464 if (is_multicast_ether_addr(hdr
->addr1
) &&
1465 ((sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& sdata
->u
.vlan
.sta
) ||
1466 (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&& sdata
->u
.mgd
.use_4addr
)))
1469 return ieee80211_data_to_8023(rx
->skb
, sdata
->vif
.addr
, sdata
->vif
.type
);
1473 * requires that rx->skb is a frame with ethernet header
1475 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1477 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1478 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1479 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1482 * Allow EAPOL frames to us/the PAE group address regardless
1483 * of whether the frame was encrypted or not.
1485 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1486 (compare_ether_addr(ehdr
->h_dest
, rx
->sdata
->vif
.addr
) == 0 ||
1487 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1490 if (ieee80211_802_1x_port_control(rx
) ||
1491 ieee80211_drop_unencrypted(rx
, fc
))
1498 * requires that rx->skb is a frame with ethernet header
1501 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1503 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1504 struct net_device
*dev
= sdata
->dev
;
1505 struct sk_buff
*skb
, *xmit_skb
;
1506 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1507 struct sta_info
*dsta
;
1512 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1513 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1514 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1515 (rx
->flags
& IEEE80211_RX_RA_MATCH
) &&
1516 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
|| !sdata
->u
.vlan
.sta
)) {
1517 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1519 * send multicast frames both to higher layers in
1520 * local net stack and back to the wireless medium
1522 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1523 if (!xmit_skb
&& net_ratelimit())
1524 printk(KERN_DEBUG
"%s: failed to clone "
1525 "multicast frame\n", dev
->name
);
1527 dsta
= sta_info_get(sdata
, skb
->data
);
1530 * The destination station is associated to
1531 * this AP (in this VLAN), so send the frame
1532 * directly to it and do not pass it to local
1542 int align __maybe_unused
;
1544 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1546 * 'align' will only take the values 0 or 2 here
1547 * since all frames are required to be aligned
1548 * to 2-byte boundaries when being passed to
1549 * mac80211. That also explains the __skb_push()
1552 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1554 if (WARN_ON(skb_headroom(skb
) < 3)) {
1558 u8
*data
= skb
->data
;
1559 size_t len
= skb_headlen(skb
);
1561 memmove(skb
->data
, data
, len
);
1562 skb_set_tail_pointer(skb
, len
);
1568 /* deliver to local stack */
1569 skb
->protocol
= eth_type_trans(skb
, dev
);
1570 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1576 /* send to wireless media */
1577 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1578 skb_reset_network_header(xmit_skb
);
1579 skb_reset_mac_header(xmit_skb
);
1580 dev_queue_xmit(xmit_skb
);
1584 static ieee80211_rx_result debug_noinline
1585 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1587 struct net_device
*dev
= rx
->sdata
->dev
;
1588 struct sk_buff
*skb
= rx
->skb
;
1589 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1590 __le16 fc
= hdr
->frame_control
;
1591 struct sk_buff_head frame_list
;
1593 if (unlikely(!ieee80211_is_data(fc
)))
1596 if (unlikely(!ieee80211_is_data_present(fc
)))
1597 return RX_DROP_MONITOR
;
1599 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1602 if (ieee80211_has_a4(hdr
->frame_control
) &&
1603 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1604 !rx
->sdata
->u
.vlan
.sta
)
1605 return RX_DROP_UNUSABLE
;
1607 if (is_multicast_ether_addr(hdr
->addr1
) &&
1608 ((rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1609 rx
->sdata
->u
.vlan
.sta
) ||
1610 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
1611 rx
->sdata
->u
.mgd
.use_4addr
)))
1612 return RX_DROP_UNUSABLE
;
1615 __skb_queue_head_init(&frame_list
);
1617 if (skb_linearize(skb
))
1618 return RX_DROP_UNUSABLE
;
1620 ieee80211_amsdu_to_8023s(skb
, &frame_list
, dev
->dev_addr
,
1621 rx
->sdata
->vif
.type
,
1622 rx
->local
->hw
.extra_tx_headroom
);
1624 while (!skb_queue_empty(&frame_list
)) {
1625 rx
->skb
= __skb_dequeue(&frame_list
);
1627 if (!ieee80211_frame_allowed(rx
, fc
)) {
1628 dev_kfree_skb(rx
->skb
);
1631 dev
->stats
.rx_packets
++;
1632 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1634 ieee80211_deliver_skb(rx
);
1640 #ifdef CONFIG_MAC80211_MESH
1641 static ieee80211_rx_result
1642 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1644 struct ieee80211_hdr
*hdr
;
1645 struct ieee80211s_hdr
*mesh_hdr
;
1646 unsigned int hdrlen
;
1647 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1648 struct ieee80211_local
*local
= rx
->local
;
1649 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1651 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1652 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1653 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1655 if (!ieee80211_is_data(hdr
->frame_control
))
1660 return RX_DROP_MONITOR
;
1662 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1663 struct mesh_path
*mppath
;
1667 if (is_multicast_ether_addr(hdr
->addr1
)) {
1668 mpp_addr
= hdr
->addr3
;
1669 proxied_addr
= mesh_hdr
->eaddr1
;
1671 mpp_addr
= hdr
->addr4
;
1672 proxied_addr
= mesh_hdr
->eaddr2
;
1676 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1678 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1680 spin_lock_bh(&mppath
->state_lock
);
1681 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1682 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1683 spin_unlock_bh(&mppath
->state_lock
);
1688 /* Frame has reached destination. Don't forward */
1689 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1690 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr3
) == 0)
1695 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1697 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1698 dropped_frames_ttl
);
1700 struct ieee80211_hdr
*fwd_hdr
;
1701 struct ieee80211_tx_info
*info
;
1703 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1705 if (!fwd_skb
&& net_ratelimit())
1706 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1709 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1710 memcpy(fwd_hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1711 info
= IEEE80211_SKB_CB(fwd_skb
);
1712 memset(info
, 0, sizeof(*info
));
1713 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1714 info
->control
.vif
= &rx
->sdata
->vif
;
1715 skb_set_queue_mapping(skb
,
1716 ieee80211_select_queue(rx
->sdata
, fwd_skb
));
1717 ieee80211_set_qos_hdr(local
, skb
);
1718 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1719 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1724 * Save TA to addr1 to send TA a path error if a
1725 * suitable next hop is not found
1727 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1729 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1730 /* Failed to immediately resolve next hop:
1731 * fwded frame was dropped or will be added
1732 * later to the pending skb queue. */
1734 return RX_DROP_MONITOR
;
1736 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1739 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1741 ieee80211_add_pending_skb(local
, fwd_skb
);
1745 if (is_multicast_ether_addr(hdr
->addr1
) ||
1746 sdata
->dev
->flags
& IFF_PROMISC
)
1749 return RX_DROP_MONITOR
;
1753 static ieee80211_rx_result debug_noinline
1754 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1756 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1757 struct ieee80211_local
*local
= rx
->local
;
1758 struct net_device
*dev
= sdata
->dev
;
1759 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1760 __le16 fc
= hdr
->frame_control
;
1763 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1766 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1767 return RX_DROP_MONITOR
;
1770 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1771 * that a 4-addr station can be detected and moved into a separate VLAN
1773 if (ieee80211_has_a4(hdr
->frame_control
) &&
1774 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1775 return RX_DROP_MONITOR
;
1777 err
= __ieee80211_data_to_8023(rx
);
1779 return RX_DROP_UNUSABLE
;
1781 if (!ieee80211_frame_allowed(rx
, fc
))
1782 return RX_DROP_MONITOR
;
1786 dev
->stats
.rx_packets
++;
1787 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1789 if (ieee80211_is_data(hdr
->frame_control
) &&
1790 !is_multicast_ether_addr(hdr
->addr1
) &&
1791 local
->hw
.conf
.dynamic_ps_timeout
> 0 && local
->ps_sdata
) {
1792 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
1793 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
1796 ieee80211_deliver_skb(rx
);
1801 static ieee80211_rx_result debug_noinline
1802 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
, struct sk_buff_head
*frames
)
1804 struct ieee80211_local
*local
= rx
->local
;
1805 struct ieee80211_hw
*hw
= &local
->hw
;
1806 struct sk_buff
*skb
= rx
->skb
;
1807 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1808 struct tid_ampdu_rx
*tid_agg_rx
;
1812 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1815 if (ieee80211_is_back_req(bar
->frame_control
)) {
1817 return RX_DROP_MONITOR
;
1818 spin_lock(&rx
->sta
->lock
);
1819 tid
= le16_to_cpu(bar
->control
) >> 12;
1820 if (!rx
->sta
->ampdu_mlme
.tid_active_rx
[tid
]) {
1821 spin_unlock(&rx
->sta
->lock
);
1822 return RX_DROP_MONITOR
;
1824 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1826 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1828 /* reset session timer */
1829 if (tid_agg_rx
->timeout
)
1830 mod_timer(&tid_agg_rx
->session_timer
,
1831 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1833 /* release stored frames up to start of BAR */
1834 ieee80211_release_reorder_frames(hw
, tid_agg_rx
, start_seq_num
,
1837 spin_unlock(&rx
->sta
->lock
);
1844 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1845 struct ieee80211_mgmt
*mgmt
,
1848 struct ieee80211_local
*local
= sdata
->local
;
1849 struct sk_buff
*skb
;
1850 struct ieee80211_mgmt
*resp
;
1852 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
) != 0) {
1853 /* Not to own unicast address */
1857 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1858 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1859 /* Not from the current AP or not associated yet. */
1863 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1864 /* Too short SA Query request frame */
1868 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1872 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1873 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1874 memset(resp
, 0, 24);
1875 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1876 memcpy(resp
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
1877 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1878 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1879 IEEE80211_STYPE_ACTION
);
1880 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1881 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1882 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1883 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1884 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1885 WLAN_SA_QUERY_TR_ID_LEN
);
1887 ieee80211_tx_skb(sdata
, skb
);
1890 static ieee80211_rx_result debug_noinline
1891 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1893 struct ieee80211_local
*local
= rx
->local
;
1894 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1895 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1896 struct sk_buff
*nskb
;
1897 struct ieee80211_rx_status
*status
;
1898 int len
= rx
->skb
->len
;
1900 if (!ieee80211_is_action(mgmt
->frame_control
))
1903 /* drop too small frames */
1904 if (len
< IEEE80211_MIN_ACTION_SIZE
)
1905 return RX_DROP_UNUSABLE
;
1907 if (!rx
->sta
&& mgmt
->u
.action
.category
!= WLAN_CATEGORY_PUBLIC
)
1908 return RX_DROP_UNUSABLE
;
1910 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1911 return RX_DROP_UNUSABLE
;
1913 if (ieee80211_drop_unencrypted_mgmt(rx
))
1914 return RX_DROP_UNUSABLE
;
1916 switch (mgmt
->u
.action
.category
) {
1917 case WLAN_CATEGORY_BACK
:
1919 * The aggregation code is not prepared to handle
1920 * anything but STA/AP due to the BSSID handling;
1921 * IBSS could work in the code but isn't supported
1922 * by drivers or the standard.
1924 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1925 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1926 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1929 /* verify action_code is present */
1930 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1933 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1934 case WLAN_ACTION_ADDBA_REQ
:
1935 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1936 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1937 return RX_DROP_MONITOR
;
1938 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1940 case WLAN_ACTION_ADDBA_RESP
:
1941 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1942 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1944 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1946 case WLAN_ACTION_DELBA
:
1947 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1948 sizeof(mgmt
->u
.action
.u
.delba
)))
1950 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1954 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1955 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1958 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1961 /* verify action_code is present */
1962 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1965 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1966 case WLAN_ACTION_SPCT_MSR_REQ
:
1967 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1968 sizeof(mgmt
->u
.action
.u
.measurement
)))
1970 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1972 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1973 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1974 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1977 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1980 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1983 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
1986 case WLAN_CATEGORY_SA_QUERY
:
1987 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1988 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1991 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1992 case WLAN_ACTION_SA_QUERY_REQUEST
:
1993 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1995 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1999 case WLAN_CATEGORY_MESH_PLINK
:
2000 case WLAN_CATEGORY_MESH_PATH_SEL
:
2001 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2002 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2007 * For AP mode, hostapd is responsible for handling any action
2008 * frames that we didn't handle, including returning unknown
2009 * ones. For all other modes we will return them to the sender,
2010 * setting the 0x80 bit in the action category, as required by
2011 * 802.11-2007 7.3.1.11.
2013 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
2014 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2015 return RX_DROP_MONITOR
;
2018 * Getting here means the kernel doesn't know how to handle
2019 * it, but maybe userspace does ... include returned frames
2020 * so userspace can register for those to know whether ones
2021 * it transmitted were processed or returned.
2023 status
= IEEE80211_SKB_RXCB(rx
->skb
);
2025 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
2026 cfg80211_rx_action(rx
->sdata
->dev
, status
->freq
,
2027 rx
->skb
->data
, rx
->skb
->len
,
2031 /* do not return rejected action frames */
2032 if (mgmt
->u
.action
.category
& 0x80)
2033 return RX_DROP_UNUSABLE
;
2035 nskb
= skb_copy_expand(rx
->skb
, local
->hw
.extra_tx_headroom
, 0,
2038 struct ieee80211_mgmt
*mgmt
= (void *)nskb
->data
;
2040 mgmt
->u
.action
.category
|= 0x80;
2041 memcpy(mgmt
->da
, mgmt
->sa
, ETH_ALEN
);
2042 memcpy(mgmt
->sa
, rx
->sdata
->vif
.addr
, ETH_ALEN
);
2044 memset(nskb
->cb
, 0, sizeof(nskb
->cb
));
2046 ieee80211_tx_skb(rx
->sdata
, nskb
);
2051 rx
->sta
->rx_packets
++;
2052 dev_kfree_skb(rx
->skb
);
2056 static ieee80211_rx_result debug_noinline
2057 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
2059 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
2060 ieee80211_rx_result rxs
;
2062 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
2063 return RX_DROP_MONITOR
;
2065 if (ieee80211_drop_unencrypted_mgmt(rx
))
2066 return RX_DROP_UNUSABLE
;
2068 rxs
= ieee80211_work_rx_mgmt(rx
->sdata
, rx
->skb
);
2069 if (rxs
!= RX_CONTINUE
)
2072 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2073 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
2075 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
2076 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
);
2078 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
2079 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
2081 return RX_DROP_MONITOR
;
2084 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
2085 struct ieee80211_rx_data
*rx
)
2088 unsigned int hdrlen
;
2090 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
2091 if (rx
->skb
->len
>= hdrlen
+ 4)
2092 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
2098 * Some hardware seem to generate incorrect Michael MIC
2099 * reports; ignore them to avoid triggering countermeasures.
2104 if (!ieee80211_has_protected(hdr
->frame_control
))
2107 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
2109 * APs with pairwise keys should never receive Michael MIC
2110 * errors for non-zero keyidx because these are reserved for
2111 * group keys and only the AP is sending real multicast
2112 * frames in the BSS.
2117 if (!ieee80211_is_data(hdr
->frame_control
) &&
2118 !ieee80211_is_auth(hdr
->frame_control
))
2121 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
2125 /* TODO: use IEEE80211_RX_FRAGMENTED */
2126 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
,
2127 struct ieee80211_rate
*rate
)
2129 struct ieee80211_sub_if_data
*sdata
;
2130 struct ieee80211_local
*local
= rx
->local
;
2131 struct ieee80211_rtap_hdr
{
2132 struct ieee80211_radiotap_header hdr
;
2137 } __attribute__ ((packed
)) *rthdr
;
2138 struct sk_buff
*skb
= rx
->skb
, *skb2
;
2139 struct net_device
*prev_dev
= NULL
;
2140 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2142 if (status
->flag
& RX_FLAG_INTERNAL_CMTR
)
2145 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
2146 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
2149 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
2150 memset(rthdr
, 0, sizeof(*rthdr
));
2151 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
2152 rthdr
->hdr
.it_present
=
2153 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
2154 (1 << IEEE80211_RADIOTAP_CHANNEL
));
2157 rthdr
->rate_or_pad
= rate
->bitrate
/ 5;
2158 rthdr
->hdr
.it_present
|=
2159 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
2161 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
2163 if (status
->band
== IEEE80211_BAND_5GHZ
)
2164 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
2165 IEEE80211_CHAN_5GHZ
);
2167 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2168 IEEE80211_CHAN_2GHZ
);
2170 skb_set_mac_header(skb
, 0);
2171 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2172 skb
->pkt_type
= PACKET_OTHERHOST
;
2173 skb
->protocol
= htons(ETH_P_802_2
);
2175 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2176 if (!ieee80211_sdata_running(sdata
))
2179 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2180 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2184 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2186 skb2
->dev
= prev_dev
;
2191 prev_dev
= sdata
->dev
;
2192 sdata
->dev
->stats
.rx_packets
++;
2193 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2197 skb
->dev
= prev_dev
;
2203 status
->flag
|= RX_FLAG_INTERNAL_CMTR
;
2211 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2212 struct ieee80211_rx_data
*rx
,
2213 struct sk_buff
*skb
,
2214 struct ieee80211_rate
*rate
)
2216 struct sk_buff_head reorder_release
;
2217 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2219 __skb_queue_head_init(&reorder_release
);
2224 #define CALL_RXH(rxh) \
2227 if (res != RX_CONTINUE) \
2232 * NB: the rxh_next label works even if we jump
2233 * to it from here because then the list will
2234 * be empty, which is a trivial check
2236 CALL_RXH(ieee80211_rx_h_passive_scan
)
2237 CALL_RXH(ieee80211_rx_h_check
)
2239 ieee80211_rx_reorder_ampdu(rx
, &reorder_release
);
2241 while ((skb
= __skb_dequeue(&reorder_release
))) {
2243 * all the other fields are valid across frames
2244 * that belong to an aMPDU since they are on the
2245 * same TID from the same station
2249 CALL_RXH(ieee80211_rx_h_decrypt
)
2250 CALL_RXH(ieee80211_rx_h_check_more_data
)
2251 CALL_RXH(ieee80211_rx_h_sta_process
)
2252 CALL_RXH(ieee80211_rx_h_defragment
)
2253 CALL_RXH(ieee80211_rx_h_ps_poll
)
2254 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2255 /* must be after MMIC verify so header is counted in MPDU mic */
2256 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2257 CALL_RXH(ieee80211_rx_h_amsdu
)
2258 #ifdef CONFIG_MAC80211_MESH
2259 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2260 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2262 CALL_RXH(ieee80211_rx_h_data
)
2264 /* special treatment -- needs the queue */
2265 res
= ieee80211_rx_h_ctrl(rx
, &reorder_release
);
2266 if (res
!= RX_CONTINUE
)
2269 CALL_RXH(ieee80211_rx_h_action
)
2270 CALL_RXH(ieee80211_rx_h_mgmt
)
2276 case RX_DROP_MONITOR
:
2277 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2279 rx
->sta
->rx_dropped
++;
2282 ieee80211_rx_cooked_monitor(rx
, rate
);
2284 case RX_DROP_UNUSABLE
:
2285 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2287 rx
->sta
->rx_dropped
++;
2288 dev_kfree_skb(rx
->skb
);
2291 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2297 /* main receive path */
2299 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2300 struct ieee80211_rx_data
*rx
,
2301 struct ieee80211_hdr
*hdr
)
2303 struct sk_buff
*skb
= rx
->skb
;
2304 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2305 u8
*bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2306 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2308 switch (sdata
->vif
.type
) {
2309 case NL80211_IFTYPE_STATION
:
2310 if (!bssid
&& !sdata
->u
.mgd
.use_4addr
)
2313 compare_ether_addr(sdata
->vif
.addr
, hdr
->addr1
) != 0) {
2314 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2316 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2319 case NL80211_IFTYPE_ADHOC
:
2322 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2325 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2326 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2328 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2329 } else if (!multicast
&&
2330 compare_ether_addr(sdata
->vif
.addr
,
2332 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2334 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2335 } else if (!rx
->sta
) {
2337 if (status
->flag
& RX_FLAG_HT
)
2338 rate_idx
= 0; /* TODO: HT rates */
2340 rate_idx
= status
->rate_idx
;
2341 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
,
2342 hdr
->addr2
, BIT(rate_idx
), GFP_ATOMIC
);
2345 case NL80211_IFTYPE_MESH_POINT
:
2347 compare_ether_addr(sdata
->vif
.addr
,
2349 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2352 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2355 case NL80211_IFTYPE_AP_VLAN
:
2356 case NL80211_IFTYPE_AP
:
2358 if (compare_ether_addr(sdata
->vif
.addr
,
2361 } else if (!ieee80211_bssid_match(bssid
,
2363 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2365 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2368 case NL80211_IFTYPE_WDS
:
2369 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2371 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2374 case NL80211_IFTYPE_MONITOR
:
2375 case NL80211_IFTYPE_UNSPECIFIED
:
2376 case __NL80211_IFTYPE_AFTER_LAST
:
2377 /* should never get here */
2386 * This is the actual Rx frames handler. as it blongs to Rx path it must
2387 * be called with rcu_read_lock protection.
2389 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2390 struct sk_buff
*skb
,
2391 struct ieee80211_rate
*rate
)
2393 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2394 struct ieee80211_local
*local
= hw_to_local(hw
);
2395 struct ieee80211_sub_if_data
*sdata
;
2396 struct ieee80211_hdr
*hdr
;
2398 struct ieee80211_rx_data rx
;
2400 struct ieee80211_sub_if_data
*prev
= NULL
;
2401 struct sk_buff
*skb_new
;
2402 struct sta_info
*sta
, *tmp
;
2403 bool found_sta
= false;
2406 fc
= ((struct ieee80211_hdr
*)skb
->data
)->frame_control
;
2407 memset(&rx
, 0, sizeof(rx
));
2411 if (ieee80211_is_data(fc
) || ieee80211_is_mgmt(fc
))
2412 local
->dot11ReceivedFragmentCount
++;
2414 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2415 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2416 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2418 if (ieee80211_is_mgmt(fc
))
2419 err
= skb_linearize(skb
);
2421 err
= !pskb_may_pull(skb
, ieee80211_hdrlen(fc
));
2428 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2429 ieee80211_parse_qos(&rx
);
2430 ieee80211_verify_alignment(&rx
);
2432 if (ieee80211_is_data(fc
)) {
2433 for_each_sta_info(local
, hdr
->addr2
, sta
, tmp
) {
2436 rx
.sdata
= sta
->sdata
;
2438 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2439 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2441 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2442 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2443 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2450 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2451 if (!ieee80211_sdata_running(sdata
))
2454 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2455 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2459 * frame is destined for this interface, but if it's
2460 * not also for the previous one we handle that after
2461 * the loop to avoid copying the SKB once too much
2469 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2471 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2472 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2477 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2479 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2480 ieee80211_rx_michael_mic_report(hdr
,
2486 * frame was destined for the previous interface
2487 * so invoke RX handlers for it
2490 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2492 if (net_ratelimit())
2493 printk(KERN_DEBUG
"%s: failed to copy "
2494 "multicast frame for %s\n",
2495 wiphy_name(local
->hw
.wiphy
),
2499 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
, rate
);
2505 rx
.sta
= sta_info_get_bss(prev
, hdr
->addr2
);
2507 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2508 prepares
= prepare_for_handlers(prev
, &rx
, hdr
);
2515 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
, rate
);
2521 * This is the receive path handler. It is called by a low level driver when an
2522 * 802.11 MPDU is received from the hardware.
2524 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2526 struct ieee80211_local
*local
= hw_to_local(hw
);
2527 struct ieee80211_rate
*rate
= NULL
;
2528 struct ieee80211_supported_band
*sband
;
2529 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2531 WARN_ON_ONCE(softirq_count() == 0);
2533 if (WARN_ON(status
->band
< 0 ||
2534 status
->band
>= IEEE80211_NUM_BANDS
))
2537 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2538 if (WARN_ON(!sband
))
2542 * If we're suspending, it is possible although not too likely
2543 * that we'd be receiving frames after having already partially
2544 * quiesced the stack. We can't process such frames then since
2545 * that might, for example, cause stations to be added or other
2546 * driver callbacks be invoked.
2548 if (unlikely(local
->quiescing
|| local
->suspended
))
2552 * The same happens when we're not even started,
2553 * but that's worth a warning.
2555 if (WARN_ON(!local
->started
))
2558 if (status
->flag
& RX_FLAG_HT
) {
2560 * rate_idx is MCS index, which can be [0-76] as documented on:
2562 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2564 * Anything else would be some sort of driver or hardware error.
2565 * The driver should catch hardware errors.
2567 if (WARN((status
->rate_idx
< 0 ||
2568 status
->rate_idx
> 76),
2569 "Rate marked as an HT rate but passed "
2570 "status->rate_idx is not "
2571 "an MCS index [0-76]: %d (0x%02x)\n",
2576 if (WARN_ON(status
->rate_idx
< 0 ||
2577 status
->rate_idx
>= sband
->n_bitrates
))
2579 rate
= &sband
->bitrates
[status
->rate_idx
];
2583 * key references and virtual interfaces are protected using RCU
2584 * and this requires that we are in a read-side RCU section during
2585 * receive processing
2590 * Frames with failed FCS/PLCP checksum are not returned,
2591 * all other frames are returned without radiotap header
2592 * if it was previously present.
2593 * Also, frames with less than 16 bytes are dropped.
2595 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2601 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2609 EXPORT_SYMBOL(ieee80211_rx
);
2611 /* This is a version of the rx handler that can be called from hard irq
2612 * context. Post the skb on the queue and schedule the tasklet */
2613 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2615 struct ieee80211_local
*local
= hw_to_local(hw
);
2617 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2619 skb
->pkt_type
= IEEE80211_RX_MSG
;
2620 skb_queue_tail(&local
->skb_queue
, skb
);
2621 tasklet_schedule(&local
->tasklet
);
2623 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);