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"
29 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
30 struct tid_ampdu_rx
*tid_agg_rx
,
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
44 skb_pull(skb
, rtap_len
);
46 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
47 if (likely(skb
->len
> FCS_LEN
))
48 skb_trim(skb
, skb
->len
- FCS_LEN
);
60 static inline int should_drop_frame(struct ieee80211_rx_status
*status
,
65 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
67 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
69 if (unlikely(skb
->len
< 16 + present_fcs_len
+ radiotap_len
))
71 if (ieee80211_is_ctl(hdr
->frame_control
) &&
72 !ieee80211_is_pspoll(hdr
->frame_control
) &&
73 !ieee80211_is_back_req(hdr
->frame_control
))
79 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
80 struct ieee80211_rx_status
*status
)
84 /* always present fields */
85 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
87 if (status
->flag
& RX_FLAG_TSFT
)
89 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DB
||
90 local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
92 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
95 if (len
& 1) /* padding for RX_FLAGS if necessary */
98 /* make sure radiotap starts at a naturally aligned address */
100 len
= roundup(len
, 8);
106 * ieee80211_add_rx_radiotap_header - add radiotap header
108 * add a radiotap header containing all the fields which the hardware provided.
111 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
113 struct ieee80211_rx_status
*status
,
114 struct ieee80211_rate
*rate
,
117 struct ieee80211_radiotap_header
*rthdr
;
120 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
121 memset(rthdr
, 0, rtap_len
);
123 /* radiotap header, set always present flags */
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
126 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
129 rthdr
->it_len
= cpu_to_le16(rtap_len
);
131 pos
= (unsigned char *)(rthdr
+1);
133 /* the order of the following fields is important */
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status
->flag
& RX_FLAG_TSFT
) {
137 *(__le64
*)pos
= cpu_to_le64(status
->mactime
);
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
145 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
146 if (status
->flag
& RX_FLAG_SHORTPRE
)
147 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
150 /* IEEE80211_RADIOTAP_RATE */
151 if (status
->flag
& RX_FLAG_HT
) {
153 * TODO: add following information into radiotap header once
154 * suitable fields are defined for it:
155 * - MCS index (status->rate_idx)
156 * - HT40 (status->flag & RX_FLAG_40MHZ)
157 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
161 rthdr
->it_present
|= (1 << IEEE80211_RADIOTAP_RATE
);
162 *pos
= rate
->bitrate
/ 5;
166 /* IEEE80211_RADIOTAP_CHANNEL */
167 *(__le16
*)pos
= cpu_to_le16(status
->freq
);
169 if (status
->band
== IEEE80211_BAND_5GHZ
)
170 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
171 IEEE80211_CHAN_5GHZ
);
172 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
173 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
174 IEEE80211_CHAN_2GHZ
);
176 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_CCK
|
177 IEEE80211_CHAN_2GHZ
);
180 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
181 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
182 *pos
= status
->signal
;
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
188 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
189 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
190 *pos
= status
->noise
;
192 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
196 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
198 /* IEEE80211_RADIOTAP_ANTENNA */
199 *pos
= status
->antenna
;
202 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
203 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DB
) {
204 *pos
= status
->signal
;
206 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL
);
210 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
212 /* IEEE80211_RADIOTAP_RX_FLAGS */
213 /* ensure 2 byte alignment for the 2 byte field as required */
214 if ((pos
- (unsigned char *)rthdr
) & 1)
216 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
217 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
218 *(__le16
*)pos
|= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS
);
223 * This function copies a received frame to all monitor interfaces and
224 * returns a cleaned-up SKB that no longer includes the FCS nor the
225 * radiotap header the driver might have added.
227 static struct sk_buff
*
228 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
229 struct ieee80211_rx_status
*status
,
230 struct ieee80211_rate
*rate
)
232 struct ieee80211_sub_if_data
*sdata
;
233 int needed_headroom
= 0;
234 struct sk_buff
*skb
, *skb2
;
235 struct net_device
*prev_dev
= NULL
;
236 int present_fcs_len
= 0;
240 * First, we may need to make a copy of the skb because
241 * (1) we need to modify it for radiotap (if not present), and
242 * (2) the other RX handlers will modify the skb we got.
244 * We don't need to, of course, if we aren't going to return
245 * the SKB because it has a bad FCS/PLCP checksum.
247 if (status
->flag
& RX_FLAG_RADIOTAP
)
248 rtap_len
= ieee80211_get_radiotap_len(origskb
->data
);
250 /* room for the radiotap header based on driver features */
251 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
253 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
254 present_fcs_len
= FCS_LEN
;
256 if (!local
->monitors
) {
257 if (should_drop_frame(status
, origskb
, present_fcs_len
,
259 dev_kfree_skb(origskb
);
263 return remove_monitor_info(local
, origskb
, rtap_len
);
266 if (should_drop_frame(status
, origskb
, present_fcs_len
, rtap_len
)) {
267 /* only need to expand headroom if necessary */
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
278 if (skb_headroom(skb
) < needed_headroom
&&
279 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
288 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
290 origskb
= remove_monitor_info(local
, origskb
, rtap_len
);
296 /* if necessary, prepend radiotap information */
297 if (!(status
->flag
& RX_FLAG_RADIOTAP
))
298 ieee80211_add_rx_radiotap_header(local
, skb
, status
, rate
,
301 skb_reset_mac_header(skb
);
302 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
303 skb
->pkt_type
= PACKET_OTHERHOST
;
304 skb
->protocol
= htons(ETH_P_802_2
);
306 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
307 if (!netif_running(sdata
->dev
))
310 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
313 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
317 skb2
= skb_clone(skb
, GFP_ATOMIC
);
319 skb2
->dev
= prev_dev
;
324 prev_dev
= sdata
->dev
;
325 sdata
->dev
->stats
.rx_packets
++;
326 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
339 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
341 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
346 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
347 /* frame has qos control */
348 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
349 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
350 rx
->flags
|= IEEE80211_RX_AMSDU
;
352 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
355 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 * Sequence numbers for management frames, QoS data
358 * frames with a broadcast/multicast address in the
359 * Address 1 field, and all non-QoS data frames sent
360 * by QoS STAs are assigned using an additional single
361 * modulo-4096 counter, [...]
363 * We also use that counter for non-QoS STAs.
365 tid
= NUM_RX_DATA_QUEUES
- 1;
369 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
370 * For now, set skb->priority to 0 for other cases. */
371 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
375 * DOC: Packet alignment
377 * Drivers always need to pass packets that are aligned to two-byte boundaries
380 * Additionally, should, if possible, align the payload data in a way that
381 * guarantees that the contained IP header is aligned to a four-byte
382 * boundary. In the case of regular frames, this simply means aligning the
383 * payload to a four-byte boundary (because either the IP header is directly
384 * contained, or IV/RFC1042 headers that have a length divisible by four are
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
393 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
397 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
399 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
402 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
406 if (WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
407 "unaligned packet at 0x%p\n", rx
->skb
->data
))
410 if (!ieee80211_is_data_present(hdr
->frame_control
))
413 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
414 if (rx
->flags
& IEEE80211_RX_AMSDU
)
416 WARN_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3,
417 "unaligned IP payload at 0x%p\n", rx
->skb
->data
+ hdrlen
);
423 static ieee80211_rx_result debug_noinline
424 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
426 struct ieee80211_local
*local
= rx
->local
;
427 struct sk_buff
*skb
= rx
->skb
;
429 if (unlikely(local
->hw_scanning
))
430 return ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
);
432 if (unlikely(local
->sw_scanning
)) {
433 /* drop all the other packets during a software scan anyway */
434 if (ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
)
440 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
441 /* scanning finished during invoking of handlers */
442 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
443 return RX_DROP_UNUSABLE
;
450 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
452 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
454 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
457 return ieee80211_is_robust_mgmt_frame(hdr
);
461 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
463 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
465 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
468 return ieee80211_is_robust_mgmt_frame(hdr
);
472 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
473 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
475 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
476 struct ieee80211_mmie
*mmie
;
478 if (skb
->len
< 24 + sizeof(*mmie
) ||
479 !is_multicast_ether_addr(hdr
->da
))
482 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
483 return -1; /* not a robust management frame */
485 mmie
= (struct ieee80211_mmie
*)
486 (skb
->data
+ skb
->len
- sizeof(*mmie
));
487 if (mmie
->element_id
!= WLAN_EID_MMIE
||
488 mmie
->length
!= sizeof(*mmie
) - 2)
491 return le16_to_cpu(mmie
->key_id
);
495 static ieee80211_rx_result
496 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
498 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
499 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
501 if (ieee80211_is_data(hdr
->frame_control
)) {
502 if (!ieee80211_has_a4(hdr
->frame_control
))
503 return RX_DROP_MONITOR
;
504 if (memcmp(hdr
->addr4
, rx
->dev
->dev_addr
, ETH_ALEN
) == 0)
505 return RX_DROP_MONITOR
;
508 /* If there is not an established peer link and this is not a peer link
509 * establisment frame, beacon or probe, drop the frame.
512 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
513 struct ieee80211_mgmt
*mgmt
;
515 if (!ieee80211_is_mgmt(hdr
->frame_control
))
516 return RX_DROP_MONITOR
;
518 if (ieee80211_is_action(hdr
->frame_control
)) {
519 mgmt
= (struct ieee80211_mgmt
*)hdr
;
520 if (mgmt
->u
.action
.category
!= PLINK_CATEGORY
)
521 return RX_DROP_MONITOR
;
525 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
526 ieee80211_is_probe_resp(hdr
->frame_control
) ||
527 ieee80211_is_beacon(hdr
->frame_control
))
530 return RX_DROP_MONITOR
;
534 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
536 if (ieee80211_is_data(hdr
->frame_control
) &&
537 is_multicast_ether_addr(hdr
->addr1
) &&
538 mesh_rmc_check(hdr
->addr4
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
539 return RX_DROP_MONITOR
;
546 static ieee80211_rx_result debug_noinline
547 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
549 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
551 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
552 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
553 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
554 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
556 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
557 rx
->local
->dot11FrameDuplicateCount
++;
558 rx
->sta
->num_duplicates
++;
560 return RX_DROP_MONITOR
;
562 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
565 if (unlikely(rx
->skb
->len
< 16)) {
566 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
567 return RX_DROP_MONITOR
;
570 /* Drop disallowed frame classes based on STA auth/assoc state;
571 * IEEE 802.11, Chap 5.5.
573 * mac80211 filters only based on association state, i.e. it drops
574 * Class 3 frames from not associated stations. hostapd sends
575 * deauth/disassoc frames when needed. In addition, hostapd is
576 * responsible for filtering on both auth and assoc states.
579 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
580 return ieee80211_rx_mesh_check(rx
);
582 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
583 ieee80211_is_pspoll(hdr
->frame_control
)) &&
584 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
585 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
586 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
587 !ieee80211_has_tods(hdr
->frame_control
) &&
588 ieee80211_is_data(hdr
->frame_control
)) ||
589 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
590 /* Drop IBSS frames and frames for other hosts
592 return RX_DROP_MONITOR
;
595 return RX_DROP_MONITOR
;
602 static ieee80211_rx_result debug_noinline
603 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
605 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
608 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
609 struct ieee80211_key
*stakey
= NULL
;
610 int mmie_keyidx
= -1;
615 * There are four types of keys:
617 * - IGTK (group keys for management frames)
618 * - PTK (pairwise keys)
619 * - STK (station-to-station pairwise keys)
621 * When selecting a key, we have to distinguish between multicast
622 * (including broadcast) and unicast frames, the latter can only
623 * use PTKs and STKs while the former always use GTKs and IGTKs.
624 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
625 * unicast frames can also use key indices like GTKs. Hence, if we
626 * don't have a PTK/STK we check the key index for a WEP key.
628 * Note that in a regular BSS, multicast frames are sent by the
629 * AP only, associated stations unicast the frame to the AP first
630 * which then multicasts it on their behalf.
632 * There is also a slight problem in IBSS mode: GTKs are negotiated
633 * with each station, that is something we don't currently handle.
634 * The spec seems to expect that one negotiates the same key with
635 * every station but there's no such requirement; VLANs could be
639 if (!ieee80211_has_protected(hdr
->frame_control
)) {
640 if (!ieee80211_is_mgmt(hdr
->frame_control
) ||
641 rx
->sta
== NULL
|| !test_sta_flags(rx
->sta
, WLAN_STA_MFP
))
643 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
649 * No point in finding a key and decrypting if the frame is neither
650 * addressed to us nor a multicast frame.
652 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
656 stakey
= rcu_dereference(rx
->sta
->key
);
658 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
660 } else if (mmie_keyidx
>= 0) {
661 /* Broadcast/multicast robust management frame / BIP */
662 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
663 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
666 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
667 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
668 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
669 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
672 * The device doesn't give us the IV so we won't be
673 * able to look up the key. That's ok though, we
674 * don't need to decrypt the frame, we just won't
675 * be able to keep statistics accurate.
676 * Except for key threshold notifications, should
677 * we somehow allow the driver to tell us which key
678 * the hardware used if this flag is set?
680 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
681 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
684 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
686 if (rx
->skb
->len
< 8 + hdrlen
)
687 return RX_DROP_UNUSABLE
; /* TODO: count this? */
690 * no need to call ieee80211_wep_get_keyidx,
691 * it verifies a bunch of things we've done already
693 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
695 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
698 * RSNA-protected unicast frames should always be sent with
699 * pairwise or station-to-station keys, but for WEP we allow
700 * using a key index as well.
702 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
703 !is_multicast_ether_addr(hdr
->addr1
))
708 rx
->key
->tx_rx_count
++;
709 /* TODO: add threshold stuff again */
711 return RX_DROP_MONITOR
;
714 /* Check for weak IVs if possible */
715 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
716 ieee80211_is_data(hdr
->frame_control
) &&
717 (!(rx
->status
->flag
& RX_FLAG_IV_STRIPPED
) ||
718 !(rx
->status
->flag
& RX_FLAG_DECRYPTED
)) &&
719 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
720 rx
->sta
->wep_weak_iv_count
++;
722 switch (rx
->key
->conf
.alg
) {
724 result
= ieee80211_crypto_wep_decrypt(rx
);
727 result
= ieee80211_crypto_tkip_decrypt(rx
);
730 result
= ieee80211_crypto_ccmp_decrypt(rx
);
733 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
737 /* either the frame has been decrypted or will be dropped */
738 rx
->status
->flag
|= RX_FLAG_DECRYPTED
;
743 static void ap_sta_ps_start(struct sta_info
*sta
)
745 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
746 struct ieee80211_local
*local
= sdata
->local
;
748 atomic_inc(&sdata
->bss
->num_sta_ps
);
749 set_and_clear_sta_flags(sta
, WLAN_STA_PS
, WLAN_STA_PSPOLL
);
750 if (local
->ops
->sta_notify
)
751 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
752 STA_NOTIFY_SLEEP
, &sta
->sta
);
753 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
754 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
755 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
756 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
759 static int ap_sta_ps_end(struct sta_info
*sta
)
761 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
762 struct ieee80211_local
*local
= sdata
->local
;
766 atomic_dec(&sdata
->bss
->num_sta_ps
);
768 clear_sta_flags(sta
, WLAN_STA_PS
| WLAN_STA_PSPOLL
);
769 if (local
->ops
->sta_notify
)
770 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
771 STA_NOTIFY_AWAKE
, &sta
->sta
);
773 if (!skb_queue_empty(&sta
->ps_tx_buf
))
774 sta_info_clear_tim_bit(sta
);
776 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
777 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
778 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
779 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
781 /* Send all buffered frames to the station */
782 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
787 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
788 local
->total_ps_buffered
--;
790 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
791 printk(KERN_DEBUG
"%s: STA %pM aid %d send PS frame "
792 "since STA not sleeping anymore\n", sdata
->dev
->name
,
793 sta
->sta
.addr
, sta
->sta
.aid
);
794 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
802 static ieee80211_rx_result debug_noinline
803 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
805 struct sta_info
*sta
= rx
->sta
;
806 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
811 /* Update last_rx only for IBSS packets which are for the current
812 * BSSID to avoid keeping the current IBSS network alive in cases where
813 * other STAs are using different BSSID. */
814 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
815 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
816 NL80211_IFTYPE_ADHOC
);
817 if (compare_ether_addr(bssid
, rx
->sdata
->u
.sta
.bssid
) == 0)
818 sta
->last_rx
= jiffies
;
820 if (!is_multicast_ether_addr(hdr
->addr1
) ||
821 rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
822 /* Update last_rx only for unicast frames in order to prevent
823 * the Probe Request frames (the only broadcast frames from a
824 * STA in infrastructure mode) from keeping a connection alive.
825 * Mesh beacons will update last_rx when if they are found to
826 * match the current local configuration when processed.
828 sta
->last_rx
= jiffies
;
831 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
835 sta
->rx_bytes
+= rx
->skb
->len
;
836 sta
->last_signal
= rx
->status
->signal
;
837 sta
->last_qual
= rx
->status
->qual
;
838 sta
->last_noise
= rx
->status
->noise
;
841 * Change STA power saving mode only at the end of a frame
844 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
845 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
846 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
847 if (test_sta_flags(sta
, WLAN_STA_PS
)) {
849 * Ignore doze->wake transitions that are
850 * indicated by non-data frames, the standard
851 * is unclear here, but for example going to
852 * PS mode and then scanning would cause a
853 * doze->wake transition for the probe request,
854 * and that is clearly undesirable.
856 if (ieee80211_is_data(hdr
->frame_control
) &&
857 !ieee80211_has_pm(hdr
->frame_control
))
858 rx
->sent_ps_buffered
+= ap_sta_ps_end(sta
);
860 if (ieee80211_has_pm(hdr
->frame_control
))
861 ap_sta_ps_start(sta
);
865 /* Drop data::nullfunc frames silently, since they are used only to
866 * control station power saving mode. */
867 if (ieee80211_is_nullfunc(hdr
->frame_control
)) {
868 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
869 /* Update counter and free packet here to avoid counting this
870 * as a dropped packed. */
872 dev_kfree_skb(rx
->skb
);
877 } /* ieee80211_rx_h_sta_process */
879 static inline struct ieee80211_fragment_entry
*
880 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
881 unsigned int frag
, unsigned int seq
, int rx_queue
,
882 struct sk_buff
**skb
)
884 struct ieee80211_fragment_entry
*entry
;
887 idx
= sdata
->fragment_next
;
888 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
889 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
890 sdata
->fragment_next
= 0;
892 if (!skb_queue_empty(&entry
->skb_list
)) {
893 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
894 struct ieee80211_hdr
*hdr
=
895 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
896 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
897 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
898 "addr1=%pM addr2=%pM\n",
899 sdata
->dev
->name
, idx
,
900 jiffies
- entry
->first_frag_time
, entry
->seq
,
901 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
903 __skb_queue_purge(&entry
->skb_list
);
906 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
908 entry
->first_frag_time
= jiffies
;
910 entry
->rx_queue
= rx_queue
;
911 entry
->last_frag
= frag
;
913 entry
->extra_len
= 0;
918 static inline struct ieee80211_fragment_entry
*
919 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
920 unsigned int frag
, unsigned int seq
,
921 int rx_queue
, struct ieee80211_hdr
*hdr
)
923 struct ieee80211_fragment_entry
*entry
;
926 idx
= sdata
->fragment_next
;
927 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
928 struct ieee80211_hdr
*f_hdr
;
932 idx
= IEEE80211_FRAGMENT_MAX
- 1;
934 entry
= &sdata
->fragments
[idx
];
935 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
936 entry
->rx_queue
!= rx_queue
||
937 entry
->last_frag
+ 1 != frag
)
940 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
943 * Check ftype and addresses are equal, else check next fragment
945 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
946 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
947 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
948 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
951 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
952 __skb_queue_purge(&entry
->skb_list
);
961 static ieee80211_rx_result debug_noinline
962 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
964 struct ieee80211_hdr
*hdr
;
967 unsigned int frag
, seq
;
968 struct ieee80211_fragment_entry
*entry
;
971 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
972 fc
= hdr
->frame_control
;
973 sc
= le16_to_cpu(hdr
->seq_ctrl
);
974 frag
= sc
& IEEE80211_SCTL_FRAG
;
976 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
977 (rx
->skb
)->len
< 24 ||
978 is_multicast_ether_addr(hdr
->addr1
))) {
982 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
984 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
987 /* This is the first fragment of a new frame. */
988 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
989 rx
->queue
, &(rx
->skb
));
990 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
991 ieee80211_has_protected(fc
)) {
992 /* Store CCMP PN so that we can verify that the next
993 * fragment has a sequential PN value. */
995 memcpy(entry
->last_pn
,
996 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1002 /* This is a fragment for a frame that should already be pending in
1003 * fragment cache. Add this fragment to the end of the pending entry.
1005 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1007 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1008 return RX_DROP_MONITOR
;
1011 /* Verify that MPDUs within one MSDU have sequential PN values.
1012 * (IEEE 802.11i, 8.3.3.4.5) */
1015 u8 pn
[CCMP_PN_LEN
], *rpn
;
1016 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1017 return RX_DROP_UNUSABLE
;
1018 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1019 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1024 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1025 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1026 return RX_DROP_UNUSABLE
;
1027 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1030 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1031 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1032 entry
->last_frag
= frag
;
1033 entry
->extra_len
+= rx
->skb
->len
;
1034 if (ieee80211_has_morefrags(fc
)) {
1039 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1040 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1041 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1042 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1044 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1045 __skb_queue_purge(&entry
->skb_list
);
1046 return RX_DROP_UNUSABLE
;
1049 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1050 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1054 /* Complete frame has been reassembled - process it now */
1055 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1059 rx
->sta
->rx_packets
++;
1060 if (is_multicast_ether_addr(hdr
->addr1
))
1061 rx
->local
->dot11MulticastReceivedFrameCount
++;
1063 ieee80211_led_rx(rx
->local
);
1067 static ieee80211_rx_result debug_noinline
1068 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1070 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1071 struct sk_buff
*skb
;
1072 int no_pending_pkts
;
1073 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1075 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1076 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1079 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1080 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1081 return RX_DROP_UNUSABLE
;
1083 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
1085 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
1087 rx
->local
->total_ps_buffered
--;
1089 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
1090 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
1093 struct ieee80211_hdr
*hdr
=
1094 (struct ieee80211_hdr
*) skb
->data
;
1097 * Tell TX path to send one frame even though the STA may
1098 * still remain is PS mode after this frame exchange.
1100 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1102 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1103 printk(KERN_DEBUG
"STA %pM aid %d: PS Poll (entries after %d)\n",
1104 rx
->sta
->sta
.addr
, rx
->sta
->sta
.aid
,
1105 skb_queue_len(&rx
->sta
->ps_tx_buf
));
1106 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1108 /* Use MoreData flag to indicate whether there are more
1109 * buffered frames for this STA */
1110 if (no_pending_pkts
)
1111 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1113 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1115 dev_queue_xmit(skb
);
1117 if (no_pending_pkts
)
1118 sta_info_clear_tim_bit(rx
->sta
);
1119 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1120 } else if (!rx
->sent_ps_buffered
) {
1122 * FIXME: This can be the result of a race condition between
1123 * us expiring a frame and the station polling for it.
1124 * Should we send it a null-func frame indicating we
1125 * have nothing buffered for it?
1127 printk(KERN_DEBUG
"%s: STA %pM sent PS Poll even "
1128 "though there are no buffered frames for it\n",
1129 rx
->dev
->name
, rx
->sta
->sta
.addr
);
1130 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133 /* Free PS Poll skb here instead of returning RX_DROP that would
1134 * count as an dropped frame. */
1135 dev_kfree_skb(rx
->skb
);
1140 static ieee80211_rx_result debug_noinline
1141 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1143 u8
*data
= rx
->skb
->data
;
1144 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1146 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1149 /* remove the qos control field, update frame type and meta-data */
1150 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1151 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1152 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1153 /* change frame type to non QOS */
1154 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1160 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1162 if (unlikely(!rx
->sta
||
1163 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1170 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1173 * Pass through unencrypted frames if the hardware has
1174 * decrypted them already.
1176 if (rx
->status
->flag
& RX_FLAG_DECRYPTED
)
1179 /* Drop unencrypted frames if key is set. */
1180 if (unlikely(!ieee80211_has_protected(fc
) &&
1181 !ieee80211_is_nullfunc(fc
) &&
1182 (!ieee80211_is_mgmt(fc
) ||
1183 (ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1184 rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
))) &&
1185 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1187 /* BIP does not use Protected field, so need to check MMIE */
1188 if (unlikely(rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
) &&
1189 ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
) &&
1190 ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1191 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1198 ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1200 struct net_device
*dev
= rx
->dev
;
1201 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
1202 u16 hdrlen
, ethertype
;
1205 u8 src
[ETH_ALEN
] __aligned(2);
1206 struct sk_buff
*skb
= rx
->skb
;
1207 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1209 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1212 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1214 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1216 * IEEE 802.11 address fields:
1217 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1218 * 0 0 DA SA BSSID n/a
1219 * 0 1 DA BSSID SA n/a
1220 * 1 0 BSSID SA DA n/a
1223 memcpy(dst
, ieee80211_get_DA(hdr
), ETH_ALEN
);
1224 memcpy(src
, ieee80211_get_SA(hdr
), ETH_ALEN
);
1226 switch (hdr
->frame_control
&
1227 cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
1228 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS
):
1229 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1230 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1233 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
1234 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1235 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
))
1237 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1238 struct ieee80211s_hdr
*meshdr
= (struct ieee80211s_hdr
*)
1239 (skb
->data
+ hdrlen
);
1240 hdrlen
+= ieee80211_get_mesh_hdrlen(meshdr
);
1241 if (meshdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
1242 memcpy(dst
, meshdr
->eaddr1
, ETH_ALEN
);
1243 memcpy(src
, meshdr
->eaddr2
, ETH_ALEN
);
1247 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS
):
1248 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
||
1249 (is_multicast_ether_addr(dst
) &&
1250 !compare_ether_addr(src
, dev
->dev_addr
)))
1253 case __constant_cpu_to_le16(0):
1254 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1259 if (unlikely(skb
->len
- hdrlen
< 8))
1262 payload
= skb
->data
+ hdrlen
;
1263 ethertype
= (payload
[6] << 8) | payload
[7];
1265 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1266 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1267 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1268 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1269 * replace EtherType */
1270 skb_pull(skb
, hdrlen
+ 6);
1271 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1272 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1274 struct ethhdr
*ehdr
;
1277 skb_pull(skb
, hdrlen
);
1278 len
= htons(skb
->len
);
1279 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1280 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1281 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1282 ehdr
->h_proto
= len
;
1288 * requires that rx->skb is a frame with ethernet header
1290 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1292 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1293 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1294 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1297 * Allow EAPOL frames to us/the PAE group address regardless
1298 * of whether the frame was encrypted or not.
1300 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1301 (compare_ether_addr(ehdr
->h_dest
, rx
->dev
->dev_addr
) == 0 ||
1302 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1305 if (ieee80211_802_1x_port_control(rx
) ||
1306 ieee80211_drop_unencrypted(rx
, fc
))
1313 * requires that rx->skb is a frame with ethernet header
1316 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1318 struct net_device
*dev
= rx
->dev
;
1319 struct ieee80211_local
*local
= rx
->local
;
1320 struct sk_buff
*skb
, *xmit_skb
;
1321 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1322 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1323 struct sta_info
*dsta
;
1328 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1329 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1330 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1331 (rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
1332 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1334 * send multicast frames both to higher layers in
1335 * local net stack and back to the wireless medium
1337 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1338 if (!xmit_skb
&& net_ratelimit())
1339 printk(KERN_DEBUG
"%s: failed to clone "
1340 "multicast frame\n", dev
->name
);
1342 dsta
= sta_info_get(local
, skb
->data
);
1343 if (dsta
&& dsta
->sdata
->dev
== dev
) {
1345 * The destination station is associated to
1346 * this AP (in this VLAN), so send the frame
1347 * directly to it and do not pass it to local
1357 int align __maybe_unused
;
1359 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1361 * 'align' will only take the values 0 or 2 here
1362 * since all frames are required to be aligned
1363 * to 2-byte boundaries when being passed to
1364 * mac80211. That also explains the __skb_push()
1367 align
= (unsigned long)skb
->data
& 4;
1369 if (WARN_ON(skb_headroom(skb
) < 3)) {
1373 u8
*data
= skb
->data
;
1374 size_t len
= skb
->len
;
1375 u8
*new = __skb_push(skb
, align
);
1376 memmove(new, data
, len
);
1377 __skb_trim(skb
, len
);
1383 /* deliver to local stack */
1384 skb
->protocol
= eth_type_trans(skb
, dev
);
1385 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1391 /* send to wireless media */
1392 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1393 skb_reset_network_header(xmit_skb
);
1394 skb_reset_mac_header(xmit_skb
);
1395 dev_queue_xmit(xmit_skb
);
1399 static ieee80211_rx_result debug_noinline
1400 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1402 struct net_device
*dev
= rx
->dev
;
1403 struct ieee80211_local
*local
= rx
->local
;
1406 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1407 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1408 __le16 fc
= hdr
->frame_control
;
1409 const struct ethhdr
*eth
;
1414 if (unlikely(!ieee80211_is_data(fc
)))
1417 if (unlikely(!ieee80211_is_data_present(fc
)))
1418 return RX_DROP_MONITOR
;
1420 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1423 err
= ieee80211_data_to_8023(rx
);
1425 return RX_DROP_UNUSABLE
;
1429 dev
->stats
.rx_packets
++;
1430 dev
->stats
.rx_bytes
+= skb
->len
;
1432 /* skip the wrapping header */
1433 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1435 return RX_DROP_UNUSABLE
;
1437 while (skb
!= frame
) {
1439 __be16 len
= eth
->h_proto
;
1440 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1442 remaining
= skb
->len
;
1443 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1444 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1446 padding
= ((4 - subframe_len
) & 0x3);
1447 /* the last MSDU has no padding */
1448 if (subframe_len
> remaining
)
1449 return RX_DROP_UNUSABLE
;
1451 skb_pull(skb
, sizeof(struct ethhdr
));
1452 /* if last subframe reuse skb */
1453 if (remaining
<= subframe_len
+ padding
)
1457 * Allocate and reserve two bytes more for payload
1458 * alignment since sizeof(struct ethhdr) is 14.
1460 frame
= dev_alloc_skb(
1461 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1465 return RX_DROP_UNUSABLE
;
1468 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1469 sizeof(struct ethhdr
) + 2);
1470 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1473 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1476 dev_kfree_skb(frame
);
1477 return RX_DROP_UNUSABLE
;
1481 skb_reset_network_header(frame
);
1483 frame
->priority
= skb
->priority
;
1486 payload
= frame
->data
;
1487 ethertype
= (payload
[6] << 8) | payload
[7];
1489 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1490 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1491 compare_ether_addr(payload
,
1492 bridge_tunnel_header
) == 0)) {
1493 /* remove RFC1042 or Bridge-Tunnel
1494 * encapsulation and replace EtherType */
1496 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1497 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1499 memcpy(skb_push(frame
, sizeof(__be16
)),
1500 &len
, sizeof(__be16
));
1501 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1502 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1505 if (!ieee80211_frame_allowed(rx
, fc
)) {
1506 if (skb
== frame
) /* last frame */
1507 return RX_DROP_UNUSABLE
;
1508 dev_kfree_skb(frame
);
1512 ieee80211_deliver_skb(rx
);
1518 #ifdef CONFIG_MAC80211_MESH
1519 static ieee80211_rx_result
1520 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1522 struct ieee80211_hdr
*hdr
;
1523 struct ieee80211s_hdr
*mesh_hdr
;
1524 unsigned int hdrlen
;
1525 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1527 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1528 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1529 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1531 if (!ieee80211_is_data(hdr
->frame_control
))
1536 return RX_DROP_MONITOR
;
1538 if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
){
1539 struct ieee80211_sub_if_data
*sdata
;
1540 struct mesh_path
*mppath
;
1542 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1544 mppath
= mpp_path_lookup(mesh_hdr
->eaddr2
, sdata
);
1546 mpp_path_add(mesh_hdr
->eaddr2
, hdr
->addr4
, sdata
);
1548 spin_lock_bh(&mppath
->state_lock
);
1549 mppath
->exp_time
= jiffies
;
1550 if (compare_ether_addr(mppath
->mpp
, hdr
->addr4
) != 0)
1551 memcpy(mppath
->mpp
, hdr
->addr4
, ETH_ALEN
);
1552 spin_unlock_bh(&mppath
->state_lock
);
1557 if (compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr3
) == 0)
1562 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1564 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1565 dropped_frames_ttl
);
1567 struct ieee80211_hdr
*fwd_hdr
;
1568 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1570 if (!fwd_skb
&& net_ratelimit())
1571 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1574 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1576 * Save TA to addr1 to send TA a path error if a
1577 * suitable next hop is not found
1579 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
, ETH_ALEN
);
1580 memcpy(fwd_hdr
->addr2
, rx
->dev
->dev_addr
, ETH_ALEN
);
1581 fwd_skb
->dev
= rx
->local
->mdev
;
1582 fwd_skb
->iif
= rx
->dev
->ifindex
;
1583 dev_queue_xmit(fwd_skb
);
1587 if (is_multicast_ether_addr(hdr
->addr3
) ||
1588 rx
->dev
->flags
& IFF_PROMISC
)
1591 return RX_DROP_MONITOR
;
1595 static ieee80211_rx_result debug_noinline
1596 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1598 struct net_device
*dev
= rx
->dev
;
1599 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1600 __le16 fc
= hdr
->frame_control
;
1603 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1606 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1607 return RX_DROP_MONITOR
;
1609 err
= ieee80211_data_to_8023(rx
);
1611 return RX_DROP_UNUSABLE
;
1613 if (!ieee80211_frame_allowed(rx
, fc
))
1614 return RX_DROP_MONITOR
;
1618 dev
->stats
.rx_packets
++;
1619 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1621 ieee80211_deliver_skb(rx
);
1626 static ieee80211_rx_result debug_noinline
1627 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
1629 struct ieee80211_local
*local
= rx
->local
;
1630 struct ieee80211_hw
*hw
= &local
->hw
;
1631 struct sk_buff
*skb
= rx
->skb
;
1632 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1633 struct tid_ampdu_rx
*tid_agg_rx
;
1637 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1640 if (ieee80211_is_back_req(bar
->frame_control
)) {
1643 tid
= le16_to_cpu(bar
->control
) >> 12;
1644 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1645 != HT_AGG_STATE_OPERATIONAL
)
1647 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1649 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1651 /* reset session timer */
1652 if (tid_agg_rx
->timeout
) {
1653 unsigned long expires
=
1654 jiffies
+ (tid_agg_rx
->timeout
/ 1000) * HZ
;
1655 mod_timer(&tid_agg_rx
->session_timer
, expires
);
1658 /* manage reordering buffer according to requested */
1659 /* sequence number */
1661 ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, NULL
,
1664 return RX_DROP_UNUSABLE
;
1670 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1671 struct ieee80211_mgmt
*mgmt
,
1674 struct ieee80211_local
*local
= sdata
->local
;
1675 struct sk_buff
*skb
;
1676 struct ieee80211_mgmt
*resp
;
1678 if (compare_ether_addr(mgmt
->da
, sdata
->dev
->dev_addr
) != 0) {
1679 /* Not to own unicast address */
1683 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.sta
.bssid
) != 0 ||
1684 compare_ether_addr(mgmt
->bssid
, sdata
->u
.sta
.bssid
) != 0) {
1685 /* Not from the current AP. */
1689 if (sdata
->u
.sta
.state
== IEEE80211_STA_MLME_ASSOCIATE
) {
1690 /* Association in progress; ignore SA Query */
1694 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1695 /* Too short SA Query request frame */
1699 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1703 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1704 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1705 memset(resp
, 0, 24);
1706 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1707 memcpy(resp
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1708 memcpy(resp
->bssid
, sdata
->u
.sta
.bssid
, ETH_ALEN
);
1709 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1710 IEEE80211_STYPE_ACTION
);
1711 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1712 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1713 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1714 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1715 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1716 WLAN_SA_QUERY_TR_ID_LEN
);
1718 ieee80211_tx_skb(sdata
, skb
, 1);
1721 static ieee80211_rx_result debug_noinline
1722 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1724 struct ieee80211_local
*local
= rx
->local
;
1725 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1726 struct ieee80211_if_sta
*ifsta
= &sdata
->u
.sta
;
1727 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1728 struct ieee80211_bss
*bss
;
1729 int len
= rx
->skb
->len
;
1731 if (!ieee80211_is_action(mgmt
->frame_control
))
1735 return RX_DROP_MONITOR
;
1737 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1738 return RX_DROP_MONITOR
;
1740 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1741 return RX_DROP_MONITOR
;
1743 /* all categories we currently handle have action_code */
1744 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1745 return RX_DROP_MONITOR
;
1747 switch (mgmt
->u
.action
.category
) {
1748 case WLAN_CATEGORY_BACK
:
1749 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1750 case WLAN_ACTION_ADDBA_REQ
:
1751 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1752 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1753 return RX_DROP_MONITOR
;
1754 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1756 case WLAN_ACTION_ADDBA_RESP
:
1757 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1758 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1759 return RX_DROP_MONITOR
;
1760 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1762 case WLAN_ACTION_DELBA
:
1763 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1764 sizeof(mgmt
->u
.action
.u
.delba
)))
1765 return RX_DROP_MONITOR
;
1766 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1770 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1771 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1772 return RX_DROP_MONITOR
;
1773 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1774 case WLAN_ACTION_SPCT_MSR_REQ
:
1775 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1776 sizeof(mgmt
->u
.action
.u
.measurement
)))
1777 return RX_DROP_MONITOR
;
1778 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1780 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1781 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1782 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1783 return RX_DROP_MONITOR
;
1785 if (memcmp(mgmt
->bssid
, ifsta
->bssid
, ETH_ALEN
) != 0)
1786 return RX_DROP_MONITOR
;
1788 bss
= ieee80211_rx_bss_get(local
, ifsta
->bssid
,
1789 local
->hw
.conf
.channel
->center_freq
,
1790 ifsta
->ssid
, ifsta
->ssid_len
);
1792 return RX_DROP_MONITOR
;
1794 ieee80211_process_chanswitch(sdata
,
1795 &mgmt
->u
.action
.u
.chan_switch
.sw_elem
, bss
);
1796 ieee80211_rx_bss_put(local
, bss
);
1800 case WLAN_CATEGORY_SA_QUERY
:
1801 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1802 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1803 return RX_DROP_MONITOR
;
1804 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1805 case WLAN_ACTION_SA_QUERY_REQUEST
:
1806 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1807 return RX_DROP_MONITOR
;
1808 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1810 case WLAN_ACTION_SA_QUERY_RESPONSE
:
1812 * SA Query response is currently only used in AP mode
1813 * and it is processed in user space.
1822 rx
->sta
->rx_packets
++;
1823 dev_kfree_skb(rx
->skb
);
1827 static ieee80211_rx_result debug_noinline
1828 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
1830 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1831 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1833 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1834 return RX_DROP_MONITOR
;
1836 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1837 return RX_DROP_MONITOR
;
1839 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1840 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1842 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1843 sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1844 return RX_DROP_MONITOR
;
1846 if (sdata
->flags
& IEEE80211_SDATA_USERSPACE_MLME
)
1847 return RX_DROP_MONITOR
;
1849 ieee80211_sta_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1853 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1854 struct ieee80211_hdr
*hdr
,
1855 struct ieee80211_rx_data
*rx
)
1858 unsigned int hdrlen
;
1860 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1861 if (rx
->skb
->len
>= hdrlen
+ 4)
1862 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1868 * Some hardware seem to generate incorrect Michael MIC
1869 * reports; ignore them to avoid triggering countermeasures.
1874 if (!ieee80211_has_protected(hdr
->frame_control
))
1877 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
1879 * APs with pairwise keys should never receive Michael MIC
1880 * errors for non-zero keyidx because these are reserved for
1881 * group keys and only the AP is sending real multicast
1882 * frames in the BSS.
1887 if (!ieee80211_is_data(hdr
->frame_control
) &&
1888 !ieee80211_is_auth(hdr
->frame_control
))
1891 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
);
1893 dev_kfree_skb(rx
->skb
);
1897 /* TODO: use IEEE80211_RX_FRAGMENTED */
1898 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
)
1900 struct ieee80211_sub_if_data
*sdata
;
1901 struct ieee80211_local
*local
= rx
->local
;
1902 struct ieee80211_rtap_hdr
{
1903 struct ieee80211_radiotap_header hdr
;
1908 } __attribute__ ((packed
)) *rthdr
;
1909 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1910 struct net_device
*prev_dev
= NULL
;
1911 struct ieee80211_rx_status
*status
= rx
->status
;
1913 if (rx
->flags
& IEEE80211_RX_CMNTR_REPORTED
)
1916 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
1917 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
1920 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
1921 memset(rthdr
, 0, sizeof(*rthdr
));
1922 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
1923 rthdr
->hdr
.it_present
=
1924 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
1925 (1 << IEEE80211_RADIOTAP_RATE
) |
1926 (1 << IEEE80211_RADIOTAP_CHANNEL
));
1928 rthdr
->rate
= rx
->rate
->bitrate
/ 5;
1929 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
1931 if (status
->band
== IEEE80211_BAND_5GHZ
)
1932 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
1933 IEEE80211_CHAN_5GHZ
);
1935 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
1936 IEEE80211_CHAN_2GHZ
);
1938 skb_set_mac_header(skb
, 0);
1939 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1940 skb
->pkt_type
= PACKET_OTHERHOST
;
1941 skb
->protocol
= htons(ETH_P_802_2
);
1943 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1944 if (!netif_running(sdata
->dev
))
1947 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
1948 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
1952 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1954 skb2
->dev
= prev_dev
;
1959 prev_dev
= sdata
->dev
;
1960 sdata
->dev
->stats
.rx_packets
++;
1961 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
1965 skb
->dev
= prev_dev
;
1971 rx
->flags
|= IEEE80211_RX_CMNTR_REPORTED
;
1979 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
1980 struct ieee80211_rx_data
*rx
,
1981 struct sk_buff
*skb
)
1983 ieee80211_rx_result res
= RX_DROP_MONITOR
;
1987 rx
->dev
= sdata
->dev
;
1989 #define CALL_RXH(rxh) \
1992 if (res != RX_CONTINUE) \
1996 CALL_RXH(ieee80211_rx_h_passive_scan
)
1997 CALL_RXH(ieee80211_rx_h_check
)
1998 CALL_RXH(ieee80211_rx_h_decrypt
)
1999 CALL_RXH(ieee80211_rx_h_sta_process
)
2000 CALL_RXH(ieee80211_rx_h_defragment
)
2001 CALL_RXH(ieee80211_rx_h_ps_poll
)
2002 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2003 /* must be after MMIC verify so header is counted in MPDU mic */
2004 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2005 CALL_RXH(ieee80211_rx_h_amsdu
)
2006 #ifdef CONFIG_MAC80211_MESH
2007 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2008 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2010 CALL_RXH(ieee80211_rx_h_data
)
2011 CALL_RXH(ieee80211_rx_h_ctrl
)
2012 CALL_RXH(ieee80211_rx_h_action
)
2013 CALL_RXH(ieee80211_rx_h_mgmt
)
2019 case RX_DROP_MONITOR
:
2020 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2022 rx
->sta
->rx_dropped
++;
2025 ieee80211_rx_cooked_monitor(rx
);
2027 case RX_DROP_UNUSABLE
:
2028 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2030 rx
->sta
->rx_dropped
++;
2031 dev_kfree_skb(rx
->skb
);
2034 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2039 /* main receive path */
2041 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2042 u8
*bssid
, struct ieee80211_rx_data
*rx
,
2043 struct ieee80211_hdr
*hdr
)
2045 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2047 switch (sdata
->vif
.type
) {
2048 case NL80211_IFTYPE_STATION
:
2051 if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
2052 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2054 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2055 } else if (!multicast
&&
2056 compare_ether_addr(sdata
->dev
->dev_addr
,
2058 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2060 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2063 case NL80211_IFTYPE_ADHOC
:
2066 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2069 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.sta
.bssid
)) {
2070 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2072 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2073 } else if (!multicast
&&
2074 compare_ether_addr(sdata
->dev
->dev_addr
,
2076 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2078 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2079 } else if (!rx
->sta
) {
2081 if (rx
->status
->flag
& RX_FLAG_HT
)
2082 rate_idx
= 0; /* TODO: HT rates */
2084 rate_idx
= rx
->status
->rate_idx
;
2085 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
, hdr
->addr2
,
2089 case NL80211_IFTYPE_MESH_POINT
:
2091 compare_ether_addr(sdata
->dev
->dev_addr
,
2093 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2096 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2099 case NL80211_IFTYPE_AP_VLAN
:
2100 case NL80211_IFTYPE_AP
:
2102 if (compare_ether_addr(sdata
->dev
->dev_addr
,
2105 } else if (!ieee80211_bssid_match(bssid
,
2106 sdata
->dev
->dev_addr
)) {
2107 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2109 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2112 case NL80211_IFTYPE_WDS
:
2113 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2115 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2118 case NL80211_IFTYPE_MONITOR
:
2119 /* take everything */
2121 case NL80211_IFTYPE_UNSPECIFIED
:
2122 case __NL80211_IFTYPE_AFTER_LAST
:
2123 /* should never get here */
2132 * This is the actual Rx frames handler. as it blongs to Rx path it must
2133 * be called with rcu_read_lock protection.
2135 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2136 struct sk_buff
*skb
,
2137 struct ieee80211_rx_status
*status
,
2138 struct ieee80211_rate
*rate
)
2140 struct ieee80211_local
*local
= hw_to_local(hw
);
2141 struct ieee80211_sub_if_data
*sdata
;
2142 struct ieee80211_hdr
*hdr
;
2143 struct ieee80211_rx_data rx
;
2145 struct ieee80211_sub_if_data
*prev
= NULL
;
2146 struct sk_buff
*skb_new
;
2149 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2150 memset(&rx
, 0, sizeof(rx
));
2157 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2158 local
->dot11ReceivedFragmentCount
++;
2160 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
2162 rx
.sdata
= rx
.sta
->sdata
;
2163 rx
.dev
= rx
.sta
->sdata
->dev
;
2166 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
2167 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, &rx
);
2171 if (unlikely(local
->sw_scanning
|| local
->hw_scanning
))
2172 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2174 ieee80211_parse_qos(&rx
);
2175 ieee80211_verify_alignment(&rx
);
2179 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2180 if (!netif_running(sdata
->dev
))
2183 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)
2186 bssid
= ieee80211_get_bssid(hdr
, skb
->len
, sdata
->vif
.type
);
2187 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2188 prepares
= prepare_for_handlers(sdata
, bssid
, &rx
, hdr
);
2194 * frame is destined for this interface, but if it's not
2195 * also for the previous one we handle that after the
2196 * loop to avoid copying the SKB once too much
2205 * frame was destined for the previous interface
2206 * so invoke RX handlers for it
2209 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2211 if (net_ratelimit())
2212 printk(KERN_DEBUG
"%s: failed to copy "
2213 "multicast frame for %s\n",
2214 wiphy_name(local
->hw
.wiphy
),
2218 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
2222 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
2227 #define SEQ_MODULO 0x1000
2228 #define SEQ_MASK 0xfff
2230 static inline int seq_less(u16 sq1
, u16 sq2
)
2232 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
2235 static inline u16
seq_inc(u16 sq
)
2237 return (sq
+ 1) & SEQ_MASK
;
2240 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
2242 return (sq1
- sq2
) & SEQ_MASK
;
2247 * As it function blongs to Rx path it must be called with
2248 * the proper rcu_read_lock protection for its flow.
2250 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
2251 struct tid_ampdu_rx
*tid_agg_rx
,
2252 struct sk_buff
*skb
,
2256 struct ieee80211_local
*local
= hw_to_local(hw
);
2257 struct ieee80211_rx_status status
;
2258 u16 head_seq_num
, buf_size
;
2260 struct ieee80211_supported_band
*sband
;
2261 struct ieee80211_rate
*rate
;
2263 buf_size
= tid_agg_rx
->buf_size
;
2264 head_seq_num
= tid_agg_rx
->head_seq_num
;
2266 /* frame with out of date sequence number */
2267 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
2272 /* if frame sequence number exceeds our buffering window size or
2273 * block Ack Request arrived - release stored frames */
2274 if ((!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) || (bar_req
)) {
2275 /* new head to the ordering buffer */
2277 head_seq_num
= mpdu_seq_num
;
2280 seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
2281 /* release stored frames up to new head to stack */
2282 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
2283 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2285 % tid_agg_rx
->buf_size
;
2287 if (tid_agg_rx
->reorder_buf
[index
]) {
2288 /* release the reordered frames to stack */
2290 tid_agg_rx
->reorder_buf
[index
]->cb
,
2292 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2293 if (status
.flag
& RX_FLAG_HT
) {
2294 /* TODO: HT rates */
2295 rate
= sband
->bitrates
;
2297 rate
= &sband
->bitrates
2300 __ieee80211_rx_handle_packet(hw
,
2301 tid_agg_rx
->reorder_buf
[index
],
2303 tid_agg_rx
->stored_mpdu_num
--;
2304 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2306 tid_agg_rx
->head_seq_num
=
2307 seq_inc(tid_agg_rx
->head_seq_num
);
2313 /* now the new frame is always in the range of the reordering */
2315 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
)
2316 % tid_agg_rx
->buf_size
;
2317 /* check if we already stored this frame */
2318 if (tid_agg_rx
->reorder_buf
[index
]) {
2323 /* if arrived mpdu is in the right order and nothing else stored */
2324 /* release it immediately */
2325 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
2326 tid_agg_rx
->stored_mpdu_num
== 0) {
2327 tid_agg_rx
->head_seq_num
=
2328 seq_inc(tid_agg_rx
->head_seq_num
);
2332 /* put the frame in the reordering buffer */
2333 tid_agg_rx
->reorder_buf
[index
] = skb
;
2334 tid_agg_rx
->stored_mpdu_num
++;
2335 /* release the buffer until next missing frame */
2336 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
)
2337 % tid_agg_rx
->buf_size
;
2338 while (tid_agg_rx
->reorder_buf
[index
]) {
2339 /* release the reordered frame back to stack */
2340 memcpy(&status
, tid_agg_rx
->reorder_buf
[index
]->cb
,
2342 sband
= local
->hw
.wiphy
->bands
[status
.band
];
2343 if (status
.flag
& RX_FLAG_HT
)
2344 rate
= sband
->bitrates
; /* TODO: HT rates */
2346 rate
= &sband
->bitrates
[status
.rate_idx
];
2347 __ieee80211_rx_handle_packet(hw
, tid_agg_rx
->reorder_buf
[index
],
2349 tid_agg_rx
->stored_mpdu_num
--;
2350 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2351 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
2352 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2353 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
2358 static u8
ieee80211_rx_reorder_ampdu(struct ieee80211_local
*local
,
2359 struct sk_buff
*skb
)
2361 struct ieee80211_hw
*hw
= &local
->hw
;
2362 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
2363 struct sta_info
*sta
;
2364 struct tid_ampdu_rx
*tid_agg_rx
;
2370 sta
= sta_info_get(local
, hdr
->addr2
);
2374 /* filter the QoS data rx stream according to
2375 * STA/TID and check if this STA/TID is on aggregation */
2376 if (!ieee80211_is_data_qos(hdr
->frame_control
))
2379 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
2381 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
2384 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
2386 /* qos null data frames are excluded */
2387 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
2390 /* new un-ordered ampdu frame - process it */
2392 /* reset session timer */
2393 if (tid_agg_rx
->timeout
) {
2394 unsigned long expires
=
2395 jiffies
+ (tid_agg_rx
->timeout
/ 1000) * HZ
;
2396 mod_timer(&tid_agg_rx
->session_timer
, expires
);
2399 /* if this mpdu is fragmented - terminate rx aggregation session */
2400 sc
= le16_to_cpu(hdr
->seq_ctrl
);
2401 if (sc
& IEEE80211_SCTL_FRAG
) {
2402 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
2403 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
2408 /* according to mpdu sequence number deal with reordering buffer */
2409 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
2410 ret
= ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
,
2417 * This is the receive path handler. It is called by a low level driver when an
2418 * 802.11 MPDU is received from the hardware.
2420 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2421 struct ieee80211_rx_status
*status
)
2423 struct ieee80211_local
*local
= hw_to_local(hw
);
2424 struct ieee80211_rate
*rate
= NULL
;
2425 struct ieee80211_supported_band
*sband
;
2427 if (status
->band
< 0 ||
2428 status
->band
>= IEEE80211_NUM_BANDS
) {
2433 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2439 if (status
->flag
& RX_FLAG_HT
) {
2440 /* rate_idx is MCS index */
2441 if (WARN_ON(status
->rate_idx
< 0 ||
2442 status
->rate_idx
>= 76))
2444 /* HT rates are not in the table - use the highest legacy rate
2445 * for now since other parts of mac80211 may not yet be fully
2447 rate
= &sband
->bitrates
[sband
->n_bitrates
- 1];
2449 if (WARN_ON(status
->rate_idx
< 0 ||
2450 status
->rate_idx
>= sband
->n_bitrates
))
2452 rate
= &sband
->bitrates
[status
->rate_idx
];
2456 * key references and virtual interfaces are protected using RCU
2457 * and this requires that we are in a read-side RCU section during
2458 * receive processing
2463 * Frames with failed FCS/PLCP checksum are not returned,
2464 * all other frames are returned without radiotap header
2465 * if it was previously present.
2466 * Also, frames with less than 16 bytes are dropped.
2468 skb
= ieee80211_rx_monitor(local
, skb
, status
, rate
);
2474 if (!ieee80211_rx_reorder_ampdu(local
, skb
))
2475 __ieee80211_rx_handle_packet(hw
, skb
, status
, rate
);
2479 EXPORT_SYMBOL(__ieee80211_rx
);
2481 /* This is a version of the rx handler that can be called from hard irq
2482 * context. Post the skb on the queue and schedule the tasklet */
2483 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2484 struct ieee80211_rx_status
*status
)
2486 struct ieee80211_local
*local
= hw_to_local(hw
);
2488 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2490 skb
->dev
= local
->mdev
;
2491 /* copy status into skb->cb for use by tasklet */
2492 memcpy(skb
->cb
, status
, sizeof(*status
));
2493 skb
->pkt_type
= IEEE80211_RX_MSG
;
2494 skb_queue_tail(&local
->skb_queue
, skb
);
2495 tasklet_schedule(&local
->tasklet
);
2497 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);