2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
30 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
31 struct tid_ampdu_rx
*tid_agg_rx
,
33 struct ieee80211_rx_status
*status
,
37 * monitor mode reception
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
42 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
46 skb_pull(skb
, rtap_len
);
48 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
49 if (likely(skb
->len
> FCS_LEN
))
50 skb_trim(skb
, skb
->len
- FCS_LEN
);
62 static inline int should_drop_frame(struct ieee80211_rx_status
*status
,
67 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
69 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
71 if (unlikely(skb
->len
< 16 + present_fcs_len
+ radiotap_len
))
73 if (ieee80211_is_ctl(hdr
->frame_control
) &&
74 !ieee80211_is_pspoll(hdr
->frame_control
) &&
75 !ieee80211_is_back_req(hdr
->frame_control
))
81 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
82 struct ieee80211_rx_status
*status
)
86 /* always present fields */
87 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
89 if (status
->flag
& RX_FLAG_TSFT
)
91 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
93 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
96 if (len
& 1) /* padding for RX_FLAGS if necessary */
99 /* make sure radiotap starts at a naturally aligned address */
101 len
= roundup(len
, 8);
107 * ieee80211_add_rx_radiotap_header - add radiotap header
109 * add a radiotap header containing all the fields which the hardware provided.
112 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
114 struct ieee80211_rx_status
*status
,
115 struct ieee80211_rate
*rate
,
118 struct ieee80211_radiotap_header
*rthdr
;
121 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
122 memset(rthdr
, 0, rtap_len
);
124 /* radiotap header, set always present flags */
126 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
127 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
128 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
129 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
130 rthdr
->it_len
= cpu_to_le16(rtap_len
);
132 pos
= (unsigned char *)(rthdr
+1);
134 /* the order of the following fields is important */
136 /* IEEE80211_RADIOTAP_TSFT */
137 if (status
->flag
& RX_FLAG_TSFT
) {
138 *(__le64
*)pos
= cpu_to_le64(status
->mactime
);
140 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
144 /* IEEE80211_RADIOTAP_FLAGS */
145 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
146 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
147 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
148 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
149 if (status
->flag
& RX_FLAG_SHORTPRE
)
150 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
153 /* IEEE80211_RADIOTAP_RATE */
154 if (status
->flag
& RX_FLAG_HT
) {
156 * TODO: add following information into radiotap header once
157 * suitable fields are defined for it:
158 * - MCS index (status->rate_idx)
159 * - HT40 (status->flag & RX_FLAG_40MHZ)
160 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
164 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
165 *pos
= rate
->bitrate
/ 5;
169 /* IEEE80211_RADIOTAP_CHANNEL */
170 *(__le16
*)pos
= cpu_to_le16(status
->freq
);
172 if (status
->band
== IEEE80211_BAND_5GHZ
)
173 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
174 IEEE80211_CHAN_5GHZ
);
175 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
176 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
177 IEEE80211_CHAN_2GHZ
);
179 *(__le16
*)pos
= cpu_to_le16(IEEE80211_CHAN_CCK
|
180 IEEE80211_CHAN_2GHZ
);
183 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
184 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
185 *pos
= status
->signal
;
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
191 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
192 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
193 *pos
= status
->noise
;
195 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
199 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
201 /* IEEE80211_RADIOTAP_ANTENNA */
202 *pos
= status
->antenna
;
205 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
207 /* IEEE80211_RADIOTAP_RX_FLAGS */
208 /* ensure 2 byte alignment for the 2 byte field as required */
209 if ((pos
- (unsigned char *)rthdr
) & 1)
211 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
212 *(__le16
*)pos
|= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP
);
217 * This function copies a received frame to all monitor interfaces and
218 * returns a cleaned-up SKB that no longer includes the FCS nor the
219 * radiotap header the driver might have added.
221 static struct sk_buff
*
222 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
223 struct ieee80211_rx_status
*status
,
224 struct ieee80211_rate
*rate
)
226 struct ieee80211_sub_if_data
*sdata
;
227 int needed_headroom
= 0;
228 struct sk_buff
*skb
, *skb2
;
229 struct net_device
*prev_dev
= NULL
;
230 int present_fcs_len
= 0;
234 * First, we may need to make a copy of the skb because
235 * (1) we need to modify it for radiotap (if not present), and
236 * (2) the other RX handlers will modify the skb we got.
238 * We don't need to, of course, if we aren't going to return
239 * the SKB because it has a bad FCS/PLCP checksum.
241 if (status
->flag
& RX_FLAG_RADIOTAP
)
242 rtap_len
= ieee80211_get_radiotap_len(origskb
->data
);
244 /* room for the radiotap header based on driver features */
245 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
247 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
248 present_fcs_len
= FCS_LEN
;
250 if (!local
->monitors
) {
251 if (should_drop_frame(status
, origskb
, present_fcs_len
,
253 dev_kfree_skb(origskb
);
257 return remove_monitor_info(local
, origskb
, rtap_len
);
260 if (should_drop_frame(status
, origskb
, present_fcs_len
, rtap_len
)) {
261 /* only need to expand headroom if necessary */
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
272 if (skb_headroom(skb
) < needed_headroom
&&
273 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
282 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
284 origskb
= remove_monitor_info(local
, origskb
, rtap_len
);
290 /* if necessary, prepend radiotap information */
291 if (!(status
->flag
& RX_FLAG_RADIOTAP
))
292 ieee80211_add_rx_radiotap_header(local
, skb
, status
, rate
,
295 skb_reset_mac_header(skb
);
296 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
297 skb
->pkt_type
= PACKET_OTHERHOST
;
298 skb
->protocol
= htons(ETH_P_802_2
);
300 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
301 if (!netif_running(sdata
->dev
))
304 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
307 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
311 skb2
= skb_clone(skb
, GFP_ATOMIC
);
313 skb2
->dev
= prev_dev
;
318 prev_dev
= sdata
->dev
;
319 sdata
->dev
->stats
.rx_packets
++;
320 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
333 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
335 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
338 /* does the frame have a qos control field? */
339 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
340 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
341 /* frame has qos control */
342 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
343 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
344 rx
->flags
|= IEEE80211_RX_AMSDU
;
346 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
357 * We also use that counter for non-QoS STAs.
359 tid
= NUM_RX_DATA_QUEUES
- 1;
363 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
364 * For now, set skb->priority to 0 for other cases. */
365 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
369 * DOC: Packet alignment
371 * Drivers always need to pass packets that are aligned to two-byte boundaries
374 * Additionally, should, if possible, align the payload data in a way that
375 * guarantees that the contained IP header is aligned to a four-byte
376 * boundary. In the case of regular frames, this simply means aligning the
377 * payload to a four-byte boundary (because either the IP header is directly
378 * contained, or IV/RFC1042 headers that have a length divisible by four are
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
391 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
393 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
396 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
400 if (WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
401 "unaligned packet at 0x%p\n", rx
->skb
->data
))
404 if (!ieee80211_is_data_present(hdr
->frame_control
))
407 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
408 if (rx
->flags
& IEEE80211_RX_AMSDU
)
410 WARN_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3,
411 "unaligned IP payload at 0x%p\n", rx
->skb
->data
+ hdrlen
);
417 static ieee80211_rx_result debug_noinline
418 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
420 struct ieee80211_local
*local
= rx
->local
;
421 struct sk_buff
*skb
= rx
->skb
;
423 if (unlikely(local
->hw_scanning
))
424 return ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
);
426 if (unlikely(local
->sw_scanning
)) {
427 /* drop all the other packets during a software scan anyway */
428 if (ieee80211_scan_rx(rx
->sdata
, skb
, rx
->status
)
434 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
435 /* scanning finished during invoking of handlers */
436 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
437 return RX_DROP_UNUSABLE
;
444 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
446 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
448 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
451 return ieee80211_is_robust_mgmt_frame(hdr
);
455 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
457 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
459 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
462 return ieee80211_is_robust_mgmt_frame(hdr
);
466 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
467 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
469 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
470 struct ieee80211_mmie
*mmie
;
472 if (skb
->len
< 24 + sizeof(*mmie
) ||
473 !is_multicast_ether_addr(hdr
->da
))
476 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
477 return -1; /* not a robust management frame */
479 mmie
= (struct ieee80211_mmie
*)
480 (skb
->data
+ skb
->len
- sizeof(*mmie
));
481 if (mmie
->element_id
!= WLAN_EID_MMIE
||
482 mmie
->length
!= sizeof(*mmie
) - 2)
485 return le16_to_cpu(mmie
->key_id
);
489 static ieee80211_rx_result
490 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
492 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
493 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
495 if (ieee80211_is_data(hdr
->frame_control
)) {
496 if (!ieee80211_has_a4(hdr
->frame_control
))
497 return RX_DROP_MONITOR
;
498 if (memcmp(hdr
->addr4
, rx
->dev
->dev_addr
, ETH_ALEN
) == 0)
499 return RX_DROP_MONITOR
;
502 /* If there is not an established peer link and this is not a peer link
503 * establisment frame, beacon or probe, drop the frame.
506 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
507 struct ieee80211_mgmt
*mgmt
;
509 if (!ieee80211_is_mgmt(hdr
->frame_control
))
510 return RX_DROP_MONITOR
;
512 if (ieee80211_is_action(hdr
->frame_control
)) {
513 mgmt
= (struct ieee80211_mgmt
*)hdr
;
514 if (mgmt
->u
.action
.category
!= PLINK_CATEGORY
)
515 return RX_DROP_MONITOR
;
519 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
520 ieee80211_is_probe_resp(hdr
->frame_control
) ||
521 ieee80211_is_beacon(hdr
->frame_control
))
524 return RX_DROP_MONITOR
;
528 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
530 if (ieee80211_is_data(hdr
->frame_control
) &&
531 is_multicast_ether_addr(hdr
->addr1
) &&
532 mesh_rmc_check(hdr
->addr4
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
533 return RX_DROP_MONITOR
;
540 static ieee80211_rx_result debug_noinline
541 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
543 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
545 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
546 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
547 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
548 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
550 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
551 rx
->local
->dot11FrameDuplicateCount
++;
552 rx
->sta
->num_duplicates
++;
554 return RX_DROP_MONITOR
;
556 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
559 if (unlikely(rx
->skb
->len
< 16)) {
560 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
561 return RX_DROP_MONITOR
;
564 /* Drop disallowed frame classes based on STA auth/assoc state;
565 * IEEE 802.11, Chap 5.5.
567 * mac80211 filters only based on association state, i.e. it drops
568 * Class 3 frames from not associated stations. hostapd sends
569 * deauth/disassoc frames when needed. In addition, hostapd is
570 * responsible for filtering on both auth and assoc states.
573 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
574 return ieee80211_rx_mesh_check(rx
);
576 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
577 ieee80211_is_pspoll(hdr
->frame_control
)) &&
578 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
579 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
580 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
581 !ieee80211_has_tods(hdr
->frame_control
) &&
582 ieee80211_is_data(hdr
->frame_control
)) ||
583 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
584 /* Drop IBSS frames and frames for other hosts
586 return RX_DROP_MONITOR
;
589 return RX_DROP_MONITOR
;
596 static ieee80211_rx_result debug_noinline
597 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
599 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
602 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
603 struct ieee80211_key
*stakey
= NULL
;
604 int mmie_keyidx
= -1;
609 * There are four types of keys:
611 * - IGTK (group keys for management frames)
612 * - PTK (pairwise keys)
613 * - STK (station-to-station pairwise keys)
615 * When selecting a key, we have to distinguish between multicast
616 * (including broadcast) and unicast frames, the latter can only
617 * use PTKs and STKs while the former always use GTKs and IGTKs.
618 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
619 * unicast frames can also use key indices like GTKs. Hence, if we
620 * don't have a PTK/STK we check the key index for a WEP key.
622 * Note that in a regular BSS, multicast frames are sent by the
623 * AP only, associated stations unicast the frame to the AP first
624 * which then multicasts it on their behalf.
626 * There is also a slight problem in IBSS mode: GTKs are negotiated
627 * with each station, that is something we don't currently handle.
628 * The spec seems to expect that one negotiates the same key with
629 * every station but there's no such requirement; VLANs could be
634 * No point in finding a key and decrypting if the frame is neither
635 * addressed to us nor a multicast frame.
637 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
641 stakey
= rcu_dereference(rx
->sta
->key
);
643 if (!ieee80211_has_protected(hdr
->frame_control
))
644 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
646 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
648 /* Skip decryption if the frame is not protected. */
649 if (!ieee80211_has_protected(hdr
->frame_control
))
651 } else if (mmie_keyidx
>= 0) {
652 /* Broadcast/multicast robust management frame / BIP */
653 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
654 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
657 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
658 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
659 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
660 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
661 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
663 * The frame was not protected, so skip decryption. However, we
664 * need to set rx->key if there is a key that could have been
665 * used so that the frame may be dropped if encryption would
666 * have been expected.
668 struct ieee80211_key
*key
= NULL
;
669 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
670 is_multicast_ether_addr(hdr
->addr1
) &&
671 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
673 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
678 * The device doesn't give us the IV so we won't be
679 * able to look up the key. That's ok though, we
680 * don't need to decrypt the frame, we just won't
681 * be able to keep statistics accurate.
682 * Except for key threshold notifications, should
683 * we somehow allow the driver to tell us which key
684 * the hardware used if this flag is set?
686 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
687 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
690 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
692 if (rx
->skb
->len
< 8 + hdrlen
)
693 return RX_DROP_UNUSABLE
; /* TODO: count this? */
696 * no need to call ieee80211_wep_get_keyidx,
697 * it verifies a bunch of things we've done already
699 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
701 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
704 * RSNA-protected unicast frames should always be sent with
705 * pairwise or station-to-station keys, but for WEP we allow
706 * using a key index as well.
708 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
709 !is_multicast_ether_addr(hdr
->addr1
))
714 rx
->key
->tx_rx_count
++;
715 /* TODO: add threshold stuff again */
717 return RX_DROP_MONITOR
;
720 /* Check for weak IVs if possible */
721 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
722 ieee80211_is_data(hdr
->frame_control
) &&
723 (!(rx
->status
->flag
& RX_FLAG_IV_STRIPPED
) ||
724 !(rx
->status
->flag
& RX_FLAG_DECRYPTED
)) &&
725 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
726 rx
->sta
->wep_weak_iv_count
++;
728 switch (rx
->key
->conf
.alg
) {
730 result
= ieee80211_crypto_wep_decrypt(rx
);
733 result
= ieee80211_crypto_tkip_decrypt(rx
);
736 result
= ieee80211_crypto_ccmp_decrypt(rx
);
739 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
743 /* either the frame has been decrypted or will be dropped */
744 rx
->status
->flag
|= RX_FLAG_DECRYPTED
;
749 static ieee80211_rx_result debug_noinline
750 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
752 struct ieee80211_local
*local
;
753 struct ieee80211_hdr
*hdr
;
758 hdr
= (struct ieee80211_hdr
*) skb
->data
;
760 if (!local
->pspolling
)
763 if (!ieee80211_has_fromds(hdr
->frame_control
))
764 /* this is not from AP */
767 if (!ieee80211_is_data(hdr
->frame_control
))
770 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
771 /* AP has no more frames buffered for us */
772 local
->pspolling
= false;
776 /* more data bit is set, let's request a new frame from the AP */
777 ieee80211_send_pspoll(local
, rx
->sdata
);
782 static void ap_sta_ps_start(struct sta_info
*sta
)
784 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
785 struct ieee80211_local
*local
= sdata
->local
;
787 atomic_inc(&sdata
->bss
->num_sta_ps
);
788 set_and_clear_sta_flags(sta
, WLAN_STA_PS
, WLAN_STA_PSPOLL
);
789 drv_sta_notify(local
, &sdata
->vif
, STA_NOTIFY_SLEEP
, &sta
->sta
);
790 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
791 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
792 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
793 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
796 static int ap_sta_ps_end(struct sta_info
*sta
)
798 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
799 struct ieee80211_local
*local
= sdata
->local
;
803 atomic_dec(&sdata
->bss
->num_sta_ps
);
805 clear_sta_flags(sta
, WLAN_STA_PS
| WLAN_STA_PSPOLL
);
806 drv_sta_notify(local
, &sdata
->vif
, STA_NOTIFY_AWAKE
, &sta
->sta
);
808 if (!skb_queue_empty(&sta
->ps_tx_buf
))
809 sta_info_clear_tim_bit(sta
);
811 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
812 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
813 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
814 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
816 /* Send all buffered frames to the station */
817 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
822 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
823 local
->total_ps_buffered
--;
825 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
826 printk(KERN_DEBUG
"%s: STA %pM aid %d send PS frame "
827 "since STA not sleeping anymore\n", sdata
->dev
->name
,
828 sta
->sta
.addr
, sta
->sta
.aid
);
829 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
837 static ieee80211_rx_result debug_noinline
838 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
840 struct sta_info
*sta
= rx
->sta
;
841 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
846 /* Update last_rx only for IBSS packets which are for the current
847 * BSSID to avoid keeping the current IBSS network alive in cases where
848 * other STAs are using different BSSID. */
849 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
850 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
851 NL80211_IFTYPE_ADHOC
);
852 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
853 sta
->last_rx
= jiffies
;
855 if (!is_multicast_ether_addr(hdr
->addr1
) ||
856 rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
857 /* Update last_rx only for unicast frames in order to prevent
858 * the Probe Request frames (the only broadcast frames from a
859 * STA in infrastructure mode) from keeping a connection alive.
860 * Mesh beacons will update last_rx when if they are found to
861 * match the current local configuration when processed.
863 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
864 ieee80211_is_beacon(hdr
->frame_control
)) {
865 rx
->sdata
->u
.mgd
.last_beacon
= jiffies
;
867 sta
->last_rx
= jiffies
;
870 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
873 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
874 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
877 sta
->rx_bytes
+= rx
->skb
->len
;
878 sta
->last_signal
= rx
->status
->signal
;
879 sta
->last_qual
= rx
->status
->qual
;
880 sta
->last_noise
= rx
->status
->noise
;
883 * Change STA power saving mode only at the end of a frame
886 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
887 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
888 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
889 if (test_sta_flags(sta
, WLAN_STA_PS
)) {
891 * Ignore doze->wake transitions that are
892 * indicated by non-data frames, the standard
893 * is unclear here, but for example going to
894 * PS mode and then scanning would cause a
895 * doze->wake transition for the probe request,
896 * and that is clearly undesirable.
898 if (ieee80211_is_data(hdr
->frame_control
) &&
899 !ieee80211_has_pm(hdr
->frame_control
))
900 rx
->sent_ps_buffered
+= ap_sta_ps_end(sta
);
902 if (ieee80211_has_pm(hdr
->frame_control
))
903 ap_sta_ps_start(sta
);
907 /* Drop data::nullfunc frames silently, since they are used only to
908 * control station power saving mode. */
909 if (ieee80211_is_nullfunc(hdr
->frame_control
)) {
910 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
911 /* Update counter and free packet here to avoid counting this
912 * as a dropped packed. */
914 dev_kfree_skb(rx
->skb
);
919 } /* ieee80211_rx_h_sta_process */
921 static inline struct ieee80211_fragment_entry
*
922 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
923 unsigned int frag
, unsigned int seq
, int rx_queue
,
924 struct sk_buff
**skb
)
926 struct ieee80211_fragment_entry
*entry
;
929 idx
= sdata
->fragment_next
;
930 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
931 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
932 sdata
->fragment_next
= 0;
934 if (!skb_queue_empty(&entry
->skb_list
)) {
935 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
936 struct ieee80211_hdr
*hdr
=
937 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
938 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
939 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
940 "addr1=%pM addr2=%pM\n",
941 sdata
->dev
->name
, idx
,
942 jiffies
- entry
->first_frag_time
, entry
->seq
,
943 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
945 __skb_queue_purge(&entry
->skb_list
);
948 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
950 entry
->first_frag_time
= jiffies
;
952 entry
->rx_queue
= rx_queue
;
953 entry
->last_frag
= frag
;
955 entry
->extra_len
= 0;
960 static inline struct ieee80211_fragment_entry
*
961 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
962 unsigned int frag
, unsigned int seq
,
963 int rx_queue
, struct ieee80211_hdr
*hdr
)
965 struct ieee80211_fragment_entry
*entry
;
968 idx
= sdata
->fragment_next
;
969 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
970 struct ieee80211_hdr
*f_hdr
;
974 idx
= IEEE80211_FRAGMENT_MAX
- 1;
976 entry
= &sdata
->fragments
[idx
];
977 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
978 entry
->rx_queue
!= rx_queue
||
979 entry
->last_frag
+ 1 != frag
)
982 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
985 * Check ftype and addresses are equal, else check next fragment
987 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
988 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
989 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
990 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
993 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
994 __skb_queue_purge(&entry
->skb_list
);
1003 static ieee80211_rx_result debug_noinline
1004 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
1006 struct ieee80211_hdr
*hdr
;
1009 unsigned int frag
, seq
;
1010 struct ieee80211_fragment_entry
*entry
;
1011 struct sk_buff
*skb
;
1013 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1014 fc
= hdr
->frame_control
;
1015 sc
= le16_to_cpu(hdr
->seq_ctrl
);
1016 frag
= sc
& IEEE80211_SCTL_FRAG
;
1018 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
1019 (rx
->skb
)->len
< 24 ||
1020 is_multicast_ether_addr(hdr
->addr1
))) {
1021 /* not fragmented */
1024 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1026 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1029 /* This is the first fragment of a new frame. */
1030 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1031 rx
->queue
, &(rx
->skb
));
1032 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1033 ieee80211_has_protected(fc
)) {
1034 /* Store CCMP PN so that we can verify that the next
1035 * fragment has a sequential PN value. */
1037 memcpy(entry
->last_pn
,
1038 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1044 /* This is a fragment for a frame that should already be pending in
1045 * fragment cache. Add this fragment to the end of the pending entry.
1047 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1049 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1050 return RX_DROP_MONITOR
;
1053 /* Verify that MPDUs within one MSDU have sequential PN values.
1054 * (IEEE 802.11i, 8.3.3.4.5) */
1057 u8 pn
[CCMP_PN_LEN
], *rpn
;
1058 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1059 return RX_DROP_UNUSABLE
;
1060 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1061 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1066 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1067 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1068 return RX_DROP_UNUSABLE
;
1069 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1072 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1073 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1074 entry
->last_frag
= frag
;
1075 entry
->extra_len
+= rx
->skb
->len
;
1076 if (ieee80211_has_morefrags(fc
)) {
1081 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1082 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1083 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1084 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1086 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1087 __skb_queue_purge(&entry
->skb_list
);
1088 return RX_DROP_UNUSABLE
;
1091 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1092 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1096 /* Complete frame has been reassembled - process it now */
1097 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1101 rx
->sta
->rx_packets
++;
1102 if (is_multicast_ether_addr(hdr
->addr1
))
1103 rx
->local
->dot11MulticastReceivedFrameCount
++;
1105 ieee80211_led_rx(rx
->local
);
1109 static ieee80211_rx_result debug_noinline
1110 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1112 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1113 struct sk_buff
*skb
;
1114 int no_pending_pkts
;
1115 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1117 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1118 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1121 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1122 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1123 return RX_DROP_UNUSABLE
;
1125 skb
= skb_dequeue(&rx
->sta
->tx_filtered
);
1127 skb
= skb_dequeue(&rx
->sta
->ps_tx_buf
);
1129 rx
->local
->total_ps_buffered
--;
1131 no_pending_pkts
= skb_queue_empty(&rx
->sta
->tx_filtered
) &&
1132 skb_queue_empty(&rx
->sta
->ps_tx_buf
);
1135 struct ieee80211_hdr
*hdr
=
1136 (struct ieee80211_hdr
*) skb
->data
;
1139 * Tell TX path to send one frame even though the STA may
1140 * still remain is PS mode after this frame exchange.
1142 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1144 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1145 printk(KERN_DEBUG
"STA %pM aid %d: PS Poll (entries after %d)\n",
1146 rx
->sta
->sta
.addr
, rx
->sta
->sta
.aid
,
1147 skb_queue_len(&rx
->sta
->ps_tx_buf
));
1148 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1150 /* Use MoreData flag to indicate whether there are more
1151 * buffered frames for this STA */
1152 if (no_pending_pkts
)
1153 hdr
->frame_control
&= cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1155 hdr
->frame_control
|= cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1157 dev_queue_xmit(skb
);
1159 if (no_pending_pkts
)
1160 sta_info_clear_tim_bit(rx
->sta
);
1161 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1162 } else if (!rx
->sent_ps_buffered
) {
1164 * FIXME: This can be the result of a race condition between
1165 * us expiring a frame and the station polling for it.
1166 * Should we send it a null-func frame indicating we
1167 * have nothing buffered for it?
1169 printk(KERN_DEBUG
"%s: STA %pM sent PS Poll even "
1170 "though there are no buffered frames for it\n",
1171 rx
->dev
->name
, rx
->sta
->sta
.addr
);
1172 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1175 /* Free PS Poll skb here instead of returning RX_DROP that would
1176 * count as an dropped frame. */
1177 dev_kfree_skb(rx
->skb
);
1182 static ieee80211_rx_result debug_noinline
1183 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1185 u8
*data
= rx
->skb
->data
;
1186 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1188 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1191 /* remove the qos control field, update frame type and meta-data */
1192 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1193 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1194 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1195 /* change frame type to non QOS */
1196 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1202 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1204 if (unlikely(!rx
->sta
||
1205 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1212 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1215 * Pass through unencrypted frames if the hardware has
1216 * decrypted them already.
1218 if (rx
->status
->flag
& RX_FLAG_DECRYPTED
)
1221 /* Drop unencrypted frames if key is set. */
1222 if (unlikely(!ieee80211_has_protected(fc
) &&
1223 !ieee80211_is_nullfunc(fc
) &&
1224 ieee80211_is_data(fc
) &&
1225 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1227 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1228 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1231 /* BIP does not use Protected field, so need to check MMIE */
1232 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
)
1233 && ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1237 * When using MFP, Action frames are not allowed prior to
1238 * having configured keys.
1240 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1241 ieee80211_is_robust_mgmt_frame(
1242 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1250 ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1252 struct net_device
*dev
= rx
->dev
;
1253 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
1254 u16 hdrlen
, ethertype
;
1257 u8 src
[ETH_ALEN
] __aligned(2);
1258 struct sk_buff
*skb
= rx
->skb
;
1259 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1261 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1264 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1266 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1268 * IEEE 802.11 address fields:
1269 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1270 * 0 0 DA SA BSSID n/a
1271 * 0 1 DA BSSID SA n/a
1272 * 1 0 BSSID SA DA n/a
1275 memcpy(dst
, ieee80211_get_DA(hdr
), ETH_ALEN
);
1276 memcpy(src
, ieee80211_get_SA(hdr
), ETH_ALEN
);
1278 switch (hdr
->frame_control
&
1279 cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
)) {
1280 case cpu_to_le16(IEEE80211_FCTL_TODS
):
1281 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_AP
&&
1282 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1285 case cpu_to_le16(IEEE80211_FCTL_TODS
| IEEE80211_FCTL_FROMDS
):
1286 if (unlikely(sdata
->vif
.type
!= NL80211_IFTYPE_WDS
&&
1287 sdata
->vif
.type
!= NL80211_IFTYPE_MESH_POINT
))
1289 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
1290 struct ieee80211s_hdr
*meshdr
= (struct ieee80211s_hdr
*)
1291 (skb
->data
+ hdrlen
);
1292 hdrlen
+= ieee80211_get_mesh_hdrlen(meshdr
);
1293 if (meshdr
->flags
& MESH_FLAGS_AE_A5_A6
) {
1294 memcpy(dst
, meshdr
->eaddr1
, ETH_ALEN
);
1295 memcpy(src
, meshdr
->eaddr2
, ETH_ALEN
);
1299 case cpu_to_le16(IEEE80211_FCTL_FROMDS
):
1300 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
||
1301 (is_multicast_ether_addr(dst
) &&
1302 !compare_ether_addr(src
, dev
->dev_addr
)))
1305 case cpu_to_le16(0):
1306 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
1311 if (unlikely(skb
->len
- hdrlen
< 8))
1314 payload
= skb
->data
+ hdrlen
;
1315 ethertype
= (payload
[6] << 8) | payload
[7];
1317 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1318 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1319 compare_ether_addr(payload
, bridge_tunnel_header
) == 0)) {
1320 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1321 * replace EtherType */
1322 skb_pull(skb
, hdrlen
+ 6);
1323 memcpy(skb_push(skb
, ETH_ALEN
), src
, ETH_ALEN
);
1324 memcpy(skb_push(skb
, ETH_ALEN
), dst
, ETH_ALEN
);
1326 struct ethhdr
*ehdr
;
1329 skb_pull(skb
, hdrlen
);
1330 len
= htons(skb
->len
);
1331 ehdr
= (struct ethhdr
*) skb_push(skb
, sizeof(struct ethhdr
));
1332 memcpy(ehdr
->h_dest
, dst
, ETH_ALEN
);
1333 memcpy(ehdr
->h_source
, src
, ETH_ALEN
);
1334 ehdr
->h_proto
= len
;
1340 * requires that rx->skb is a frame with ethernet header
1342 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1344 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1345 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1346 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1349 * Allow EAPOL frames to us/the PAE group address regardless
1350 * of whether the frame was encrypted or not.
1352 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1353 (compare_ether_addr(ehdr
->h_dest
, rx
->dev
->dev_addr
) == 0 ||
1354 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1357 if (ieee80211_802_1x_port_control(rx
) ||
1358 ieee80211_drop_unencrypted(rx
, fc
))
1365 * requires that rx->skb is a frame with ethernet header
1368 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1370 struct net_device
*dev
= rx
->dev
;
1371 struct ieee80211_local
*local
= rx
->local
;
1372 struct sk_buff
*skb
, *xmit_skb
;
1373 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1374 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1375 struct sta_info
*dsta
;
1380 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1381 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1382 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1383 (rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
1384 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1386 * send multicast frames both to higher layers in
1387 * local net stack and back to the wireless medium
1389 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1390 if (!xmit_skb
&& net_ratelimit())
1391 printk(KERN_DEBUG
"%s: failed to clone "
1392 "multicast frame\n", dev
->name
);
1394 dsta
= sta_info_get(local
, skb
->data
);
1395 if (dsta
&& dsta
->sdata
->dev
== dev
) {
1397 * The destination station is associated to
1398 * this AP (in this VLAN), so send the frame
1399 * directly to it and do not pass it to local
1409 int align __maybe_unused
;
1411 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1413 * 'align' will only take the values 0 or 2 here
1414 * since all frames are required to be aligned
1415 * to 2-byte boundaries when being passed to
1416 * mac80211. That also explains the __skb_push()
1419 align
= (unsigned long)skb
->data
& 3;
1421 if (WARN_ON(skb_headroom(skb
) < 3)) {
1425 u8
*data
= skb
->data
;
1426 size_t len
= skb
->len
;
1427 u8
*new = __skb_push(skb
, align
);
1428 memmove(new, data
, len
);
1429 __skb_trim(skb
, len
);
1435 /* deliver to local stack */
1436 skb
->protocol
= eth_type_trans(skb
, dev
);
1437 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1443 /* send to wireless media */
1444 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1445 skb_reset_network_header(xmit_skb
);
1446 skb_reset_mac_header(xmit_skb
);
1447 dev_queue_xmit(xmit_skb
);
1451 static ieee80211_rx_result debug_noinline
1452 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1454 struct net_device
*dev
= rx
->dev
;
1455 struct ieee80211_local
*local
= rx
->local
;
1458 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1459 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1460 __le16 fc
= hdr
->frame_control
;
1461 const struct ethhdr
*eth
;
1466 if (unlikely(!ieee80211_is_data(fc
)))
1469 if (unlikely(!ieee80211_is_data_present(fc
)))
1470 return RX_DROP_MONITOR
;
1472 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1475 err
= ieee80211_data_to_8023(rx
);
1477 return RX_DROP_UNUSABLE
;
1481 dev
->stats
.rx_packets
++;
1482 dev
->stats
.rx_bytes
+= skb
->len
;
1484 /* skip the wrapping header */
1485 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1487 return RX_DROP_UNUSABLE
;
1489 while (skb
!= frame
) {
1491 __be16 len
= eth
->h_proto
;
1492 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1494 remaining
= skb
->len
;
1495 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1496 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1498 padding
= ((4 - subframe_len
) & 0x3);
1499 /* the last MSDU has no padding */
1500 if (subframe_len
> remaining
)
1501 return RX_DROP_UNUSABLE
;
1503 skb_pull(skb
, sizeof(struct ethhdr
));
1504 /* if last subframe reuse skb */
1505 if (remaining
<= subframe_len
+ padding
)
1509 * Allocate and reserve two bytes more for payload
1510 * alignment since sizeof(struct ethhdr) is 14.
1512 frame
= dev_alloc_skb(
1513 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1517 return RX_DROP_UNUSABLE
;
1520 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1521 sizeof(struct ethhdr
) + 2);
1522 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1525 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1528 dev_kfree_skb(frame
);
1529 return RX_DROP_UNUSABLE
;
1533 skb_reset_network_header(frame
);
1535 frame
->priority
= skb
->priority
;
1538 payload
= frame
->data
;
1539 ethertype
= (payload
[6] << 8) | payload
[7];
1541 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1542 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1543 compare_ether_addr(payload
,
1544 bridge_tunnel_header
) == 0)) {
1545 /* remove RFC1042 or Bridge-Tunnel
1546 * encapsulation and replace EtherType */
1548 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1549 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1551 memcpy(skb_push(frame
, sizeof(__be16
)),
1552 &len
, sizeof(__be16
));
1553 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1554 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1557 if (!ieee80211_frame_allowed(rx
, fc
)) {
1558 if (skb
== frame
) /* last frame */
1559 return RX_DROP_UNUSABLE
;
1560 dev_kfree_skb(frame
);
1564 ieee80211_deliver_skb(rx
);
1570 #ifdef CONFIG_MAC80211_MESH
1571 static ieee80211_rx_result
1572 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1574 struct ieee80211_hdr
*hdr
;
1575 struct ieee80211s_hdr
*mesh_hdr
;
1576 unsigned int hdrlen
;
1577 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1579 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1580 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1581 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1583 if (!ieee80211_is_data(hdr
->frame_control
))
1588 return RX_DROP_MONITOR
;
1590 if (mesh_hdr
->flags
& MESH_FLAGS_AE_A5_A6
){
1591 struct ieee80211_sub_if_data
*sdata
;
1592 struct mesh_path
*mppath
;
1594 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1596 mppath
= mpp_path_lookup(mesh_hdr
->eaddr2
, sdata
);
1598 mpp_path_add(mesh_hdr
->eaddr2
, hdr
->addr4
, sdata
);
1600 spin_lock_bh(&mppath
->state_lock
);
1601 mppath
->exp_time
= jiffies
;
1602 if (compare_ether_addr(mppath
->mpp
, hdr
->addr4
) != 0)
1603 memcpy(mppath
->mpp
, hdr
->addr4
, ETH_ALEN
);
1604 spin_unlock_bh(&mppath
->state_lock
);
1609 if (compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr3
) == 0)
1614 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1616 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1617 dropped_frames_ttl
);
1619 struct ieee80211_hdr
*fwd_hdr
;
1620 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1622 if (!fwd_skb
&& net_ratelimit())
1623 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1626 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1628 * Save TA to addr1 to send TA a path error if a
1629 * suitable next hop is not found
1631 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
, ETH_ALEN
);
1632 memcpy(fwd_hdr
->addr2
, rx
->dev
->dev_addr
, ETH_ALEN
);
1633 fwd_skb
->dev
= rx
->local
->mdev
;
1634 fwd_skb
->iif
= rx
->dev
->ifindex
;
1635 dev_queue_xmit(fwd_skb
);
1639 if (is_multicast_ether_addr(hdr
->addr3
) ||
1640 rx
->dev
->flags
& IFF_PROMISC
)
1643 return RX_DROP_MONITOR
;
1647 static ieee80211_rx_result debug_noinline
1648 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1650 struct net_device
*dev
= rx
->dev
;
1651 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1652 __le16 fc
= hdr
->frame_control
;
1655 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1658 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1659 return RX_DROP_MONITOR
;
1661 err
= ieee80211_data_to_8023(rx
);
1663 return RX_DROP_UNUSABLE
;
1665 if (!ieee80211_frame_allowed(rx
, fc
))
1666 return RX_DROP_MONITOR
;
1670 dev
->stats
.rx_packets
++;
1671 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1673 ieee80211_deliver_skb(rx
);
1678 static ieee80211_rx_result debug_noinline
1679 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
1681 struct ieee80211_local
*local
= rx
->local
;
1682 struct ieee80211_hw
*hw
= &local
->hw
;
1683 struct sk_buff
*skb
= rx
->skb
;
1684 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1685 struct tid_ampdu_rx
*tid_agg_rx
;
1689 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1692 if (ieee80211_is_back_req(bar
->frame_control
)) {
1695 tid
= le16_to_cpu(bar
->control
) >> 12;
1696 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1697 != HT_AGG_STATE_OPERATIONAL
)
1699 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1701 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1703 /* reset session timer */
1704 if (tid_agg_rx
->timeout
)
1705 mod_timer(&tid_agg_rx
->session_timer
,
1706 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1708 /* manage reordering buffer according to requested */
1709 /* sequence number */
1711 ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, NULL
, NULL
,
1714 return RX_DROP_UNUSABLE
;
1720 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1721 struct ieee80211_mgmt
*mgmt
,
1724 struct ieee80211_local
*local
= sdata
->local
;
1725 struct sk_buff
*skb
;
1726 struct ieee80211_mgmt
*resp
;
1728 if (compare_ether_addr(mgmt
->da
, sdata
->dev
->dev_addr
) != 0) {
1729 /* Not to own unicast address */
1733 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1734 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1735 /* Not from the current AP. */
1739 if (sdata
->u
.mgd
.state
== IEEE80211_STA_MLME_ASSOCIATE
) {
1740 /* Association in progress; ignore SA Query */
1744 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1745 /* Too short SA Query request frame */
1749 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1753 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1754 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1755 memset(resp
, 0, 24);
1756 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1757 memcpy(resp
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1758 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1759 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1760 IEEE80211_STYPE_ACTION
);
1761 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1762 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1763 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1764 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1765 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1766 WLAN_SA_QUERY_TR_ID_LEN
);
1768 ieee80211_tx_skb(sdata
, skb
, 1);
1771 static ieee80211_rx_result debug_noinline
1772 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1774 struct ieee80211_local
*local
= rx
->local
;
1775 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1776 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1777 struct ieee80211_bss
*bss
;
1778 int len
= rx
->skb
->len
;
1780 if (!ieee80211_is_action(mgmt
->frame_control
))
1784 return RX_DROP_MONITOR
;
1786 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1787 return RX_DROP_MONITOR
;
1789 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1790 return RX_DROP_MONITOR
;
1792 /* all categories we currently handle have action_code */
1793 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1794 return RX_DROP_MONITOR
;
1796 switch (mgmt
->u
.action
.category
) {
1797 case WLAN_CATEGORY_BACK
:
1799 * The aggregation code is not prepared to handle
1800 * anything but STA/AP due to the BSSID handling;
1801 * IBSS could work in the code but isn't supported
1802 * by drivers or the standard.
1804 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1805 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1806 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1807 return RX_DROP_MONITOR
;
1809 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1810 case WLAN_ACTION_ADDBA_REQ
:
1811 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1812 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1813 return RX_DROP_MONITOR
;
1814 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1816 case WLAN_ACTION_ADDBA_RESP
:
1817 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1818 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1819 return RX_DROP_MONITOR
;
1820 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1822 case WLAN_ACTION_DELBA
:
1823 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1824 sizeof(mgmt
->u
.action
.u
.delba
)))
1825 return RX_DROP_MONITOR
;
1826 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1830 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1831 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1832 return RX_DROP_MONITOR
;
1834 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1835 return RX_DROP_MONITOR
;
1837 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1838 case WLAN_ACTION_SPCT_MSR_REQ
:
1839 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1840 sizeof(mgmt
->u
.action
.u
.measurement
)))
1841 return RX_DROP_MONITOR
;
1842 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1844 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1845 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1846 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1847 return RX_DROP_MONITOR
;
1849 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1850 return RX_DROP_MONITOR
;
1852 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1853 return RX_DROP_MONITOR
;
1855 bss
= ieee80211_rx_bss_get(local
, sdata
->u
.mgd
.bssid
,
1856 local
->hw
.conf
.channel
->center_freq
,
1858 sdata
->u
.mgd
.ssid_len
);
1860 return RX_DROP_MONITOR
;
1862 ieee80211_sta_process_chanswitch(sdata
,
1863 &mgmt
->u
.action
.u
.chan_switch
.sw_elem
, bss
);
1864 ieee80211_rx_bss_put(local
, bss
);
1868 case WLAN_CATEGORY_SA_QUERY
:
1869 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1870 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1871 return RX_DROP_MONITOR
;
1872 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1873 case WLAN_ACTION_SA_QUERY_REQUEST
:
1874 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1875 return RX_DROP_MONITOR
;
1876 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1878 case WLAN_ACTION_SA_QUERY_RESPONSE
:
1880 * SA Query response is currently only used in AP mode
1881 * and it is processed in user space.
1890 rx
->sta
->rx_packets
++;
1891 dev_kfree_skb(rx
->skb
);
1895 static ieee80211_rx_result debug_noinline
1896 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
1898 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1899 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1901 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1902 return RX_DROP_MONITOR
;
1904 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1905 return RX_DROP_MONITOR
;
1907 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1908 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1910 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
1911 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1913 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1914 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
, rx
->status
);
1916 return RX_DROP_MONITOR
;
1919 static void ieee80211_rx_michael_mic_report(struct net_device
*dev
,
1920 struct ieee80211_hdr
*hdr
,
1921 struct ieee80211_rx_data
*rx
)
1924 unsigned int hdrlen
;
1926 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1927 if (rx
->skb
->len
>= hdrlen
+ 4)
1928 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1934 * Some hardware seem to generate incorrect Michael MIC
1935 * reports; ignore them to avoid triggering countermeasures.
1940 if (!ieee80211_has_protected(hdr
->frame_control
))
1943 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
1945 * APs with pairwise keys should never receive Michael MIC
1946 * errors for non-zero keyidx because these are reserved for
1947 * group keys and only the AP is sending real multicast
1948 * frames in the BSS.
1953 if (!ieee80211_is_data(hdr
->frame_control
) &&
1954 !ieee80211_is_auth(hdr
->frame_control
))
1957 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
);
1959 dev_kfree_skb(rx
->skb
);
1963 /* TODO: use IEEE80211_RX_FRAGMENTED */
1964 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
)
1966 struct ieee80211_sub_if_data
*sdata
;
1967 struct ieee80211_local
*local
= rx
->local
;
1968 struct ieee80211_rtap_hdr
{
1969 struct ieee80211_radiotap_header hdr
;
1974 } __attribute__ ((packed
)) *rthdr
;
1975 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1976 struct net_device
*prev_dev
= NULL
;
1977 struct ieee80211_rx_status
*status
= rx
->status
;
1979 if (rx
->flags
& IEEE80211_RX_CMNTR_REPORTED
)
1982 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
1983 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
1986 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
1987 memset(rthdr
, 0, sizeof(*rthdr
));
1988 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
1989 rthdr
->hdr
.it_present
=
1990 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
1991 (1 << IEEE80211_RADIOTAP_RATE
) |
1992 (1 << IEEE80211_RADIOTAP_CHANNEL
));
1994 rthdr
->rate
= rx
->rate
->bitrate
/ 5;
1995 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
1997 if (status
->band
== IEEE80211_BAND_5GHZ
)
1998 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
1999 IEEE80211_CHAN_5GHZ
);
2001 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
2002 IEEE80211_CHAN_2GHZ
);
2004 skb_set_mac_header(skb
, 0);
2005 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2006 skb
->pkt_type
= PACKET_OTHERHOST
;
2007 skb
->protocol
= htons(ETH_P_802_2
);
2009 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2010 if (!netif_running(sdata
->dev
))
2013 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
2014 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
2018 skb2
= skb_clone(skb
, GFP_ATOMIC
);
2020 skb2
->dev
= prev_dev
;
2025 prev_dev
= sdata
->dev
;
2026 sdata
->dev
->stats
.rx_packets
++;
2027 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
2031 skb
->dev
= prev_dev
;
2037 rx
->flags
|= IEEE80211_RX_CMNTR_REPORTED
;
2045 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
2046 struct ieee80211_rx_data
*rx
,
2047 struct sk_buff
*skb
)
2049 ieee80211_rx_result res
= RX_DROP_MONITOR
;
2053 rx
->dev
= sdata
->dev
;
2055 #define CALL_RXH(rxh) \
2058 if (res != RX_CONTINUE) \
2062 CALL_RXH(ieee80211_rx_h_passive_scan
)
2063 CALL_RXH(ieee80211_rx_h_check
)
2064 CALL_RXH(ieee80211_rx_h_decrypt
)
2065 CALL_RXH(ieee80211_rx_h_check_more_data
)
2066 CALL_RXH(ieee80211_rx_h_sta_process
)
2067 CALL_RXH(ieee80211_rx_h_defragment
)
2068 CALL_RXH(ieee80211_rx_h_ps_poll
)
2069 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
2070 /* must be after MMIC verify so header is counted in MPDU mic */
2071 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
2072 CALL_RXH(ieee80211_rx_h_amsdu
)
2073 #ifdef CONFIG_MAC80211_MESH
2074 if (ieee80211_vif_is_mesh(&sdata
->vif
))
2075 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
2077 CALL_RXH(ieee80211_rx_h_data
)
2078 CALL_RXH(ieee80211_rx_h_ctrl
)
2079 CALL_RXH(ieee80211_rx_h_action
)
2080 CALL_RXH(ieee80211_rx_h_mgmt
)
2086 case RX_DROP_MONITOR
:
2087 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2089 rx
->sta
->rx_dropped
++;
2092 ieee80211_rx_cooked_monitor(rx
);
2094 case RX_DROP_UNUSABLE
:
2095 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
2097 rx
->sta
->rx_dropped
++;
2098 dev_kfree_skb(rx
->skb
);
2101 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
2106 /* main receive path */
2108 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
2109 struct ieee80211_rx_data
*rx
,
2110 struct ieee80211_hdr
*hdr
)
2112 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
, sdata
->vif
.type
);
2113 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
2115 switch (sdata
->vif
.type
) {
2116 case NL80211_IFTYPE_STATION
:
2119 if (!ieee80211_bssid_match(bssid
, sdata
->u
.mgd
.bssid
)) {
2120 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2122 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2123 } else if (!multicast
&&
2124 compare_ether_addr(sdata
->dev
->dev_addr
,
2126 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2128 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2131 case NL80211_IFTYPE_ADHOC
:
2134 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2137 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2138 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2140 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2141 } else if (!multicast
&&
2142 compare_ether_addr(sdata
->dev
->dev_addr
,
2144 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2146 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2147 } else if (!rx
->sta
) {
2149 if (rx
->status
->flag
& RX_FLAG_HT
)
2150 rate_idx
= 0; /* TODO: HT rates */
2152 rate_idx
= rx
->status
->rate_idx
;
2153 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
, hdr
->addr2
,
2157 case NL80211_IFTYPE_MESH_POINT
:
2159 compare_ether_addr(sdata
->dev
->dev_addr
,
2161 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2164 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2167 case NL80211_IFTYPE_AP_VLAN
:
2168 case NL80211_IFTYPE_AP
:
2170 if (compare_ether_addr(sdata
->dev
->dev_addr
,
2173 } else if (!ieee80211_bssid_match(bssid
,
2174 sdata
->dev
->dev_addr
)) {
2175 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2177 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2180 case NL80211_IFTYPE_WDS
:
2181 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2183 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2186 case NL80211_IFTYPE_MONITOR
:
2187 /* take everything */
2189 case NL80211_IFTYPE_UNSPECIFIED
:
2190 case __NL80211_IFTYPE_AFTER_LAST
:
2191 /* should never get here */
2200 * This is the actual Rx frames handler. as it blongs to Rx path it must
2201 * be called with rcu_read_lock protection.
2203 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2204 struct sk_buff
*skb
,
2205 struct ieee80211_rx_status
*status
,
2206 struct ieee80211_rate
*rate
)
2208 struct ieee80211_local
*local
= hw_to_local(hw
);
2209 struct ieee80211_sub_if_data
*sdata
;
2210 struct ieee80211_hdr
*hdr
;
2211 struct ieee80211_rx_data rx
;
2213 struct ieee80211_sub_if_data
*prev
= NULL
;
2214 struct sk_buff
*skb_new
;
2216 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2217 memset(&rx
, 0, sizeof(rx
));
2224 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2225 local
->dot11ReceivedFragmentCount
++;
2227 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
2229 rx
.sdata
= rx
.sta
->sdata
;
2230 rx
.dev
= rx
.sta
->sdata
->dev
;
2233 if ((status
->flag
& RX_FLAG_MMIC_ERROR
)) {
2234 ieee80211_rx_michael_mic_report(local
->mdev
, hdr
, &rx
);
2238 if (unlikely(local
->sw_scanning
|| local
->hw_scanning
))
2239 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2241 ieee80211_parse_qos(&rx
);
2242 ieee80211_verify_alignment(&rx
);
2246 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2247 if (!netif_running(sdata
->dev
))
2250 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
)
2253 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2254 prepares
= prepare_for_handlers(sdata
, &rx
, hdr
);
2260 * frame is destined for this interface, but if it's not
2261 * also for the previous one we handle that after the
2262 * loop to avoid copying the SKB once too much
2271 * frame was destined for the previous interface
2272 * so invoke RX handlers for it
2275 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2277 if (net_ratelimit())
2278 printk(KERN_DEBUG
"%s: failed to copy "
2279 "multicast frame for %s\n",
2280 wiphy_name(local
->hw
.wiphy
),
2284 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
2288 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
2293 #define SEQ_MODULO 0x1000
2294 #define SEQ_MASK 0xfff
2296 static inline int seq_less(u16 sq1
, u16 sq2
)
2298 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
2301 static inline u16
seq_inc(u16 sq
)
2303 return (sq
+ 1) & SEQ_MASK
;
2306 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
2308 return (sq1
- sq2
) & SEQ_MASK
;
2312 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
2313 struct tid_ampdu_rx
*tid_agg_rx
,
2316 struct ieee80211_supported_band
*sband
;
2317 struct ieee80211_rate
*rate
;
2318 struct ieee80211_rx_status status
;
2320 if (!tid_agg_rx
->reorder_buf
[index
])
2323 /* release the reordered frames to stack */
2324 memcpy(&status
, tid_agg_rx
->reorder_buf
[index
]->cb
, sizeof(status
));
2325 sband
= hw
->wiphy
->bands
[status
.band
];
2326 if (status
.flag
& RX_FLAG_HT
)
2327 rate
= sband
->bitrates
; /* TODO: HT rates */
2329 rate
= &sband
->bitrates
[status
.rate_idx
];
2330 __ieee80211_rx_handle_packet(hw
, tid_agg_rx
->reorder_buf
[index
],
2332 tid_agg_rx
->stored_mpdu_num
--;
2333 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2336 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
2341 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2342 * the skb was added to the buffer longer than this time ago, the earlier
2343 * frames that have not yet been received are assumed to be lost and the skb
2344 * can be released for processing. This may also release other skb's from the
2345 * reorder buffer if there are no additional gaps between the frames.
2347 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2350 * As it function blongs to Rx path it must be called with
2351 * the proper rcu_read_lock protection for its flow.
2353 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
2354 struct tid_ampdu_rx
*tid_agg_rx
,
2355 struct sk_buff
*skb
,
2356 struct ieee80211_rx_status
*rxstatus
,
2360 u16 head_seq_num
, buf_size
;
2363 buf_size
= tid_agg_rx
->buf_size
;
2364 head_seq_num
= tid_agg_rx
->head_seq_num
;
2366 /* frame with out of date sequence number */
2367 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
2372 /* if frame sequence number exceeds our buffering window size or
2373 * block Ack Request arrived - release stored frames */
2374 if ((!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) || (bar_req
)) {
2375 /* new head to the ordering buffer */
2377 head_seq_num
= mpdu_seq_num
;
2380 seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
2381 /* release stored frames up to new head to stack */
2382 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
2383 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2385 % tid_agg_rx
->buf_size
;
2386 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
2393 /* now the new frame is always in the range of the reordering */
2395 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
)
2396 % tid_agg_rx
->buf_size
;
2397 /* check if we already stored this frame */
2398 if (tid_agg_rx
->reorder_buf
[index
]) {
2403 /* if arrived mpdu is in the right order and nothing else stored */
2404 /* release it immediately */
2405 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
2406 tid_agg_rx
->stored_mpdu_num
== 0) {
2407 tid_agg_rx
->head_seq_num
=
2408 seq_inc(tid_agg_rx
->head_seq_num
);
2412 /* put the frame in the reordering buffer */
2413 tid_agg_rx
->reorder_buf
[index
] = skb
;
2414 tid_agg_rx
->reorder_time
[index
] = jiffies
;
2415 memcpy(tid_agg_rx
->reorder_buf
[index
]->cb
, rxstatus
,
2417 tid_agg_rx
->stored_mpdu_num
++;
2418 /* release the buffer until next missing frame */
2419 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
)
2420 % tid_agg_rx
->buf_size
;
2421 if (!tid_agg_rx
->reorder_buf
[index
] &&
2422 tid_agg_rx
->stored_mpdu_num
> 1) {
2424 * No buffers ready to be released, but check whether any
2425 * frames in the reorder buffer have timed out.
2429 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
2430 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
2431 if (tid_agg_rx
->reorder_buf
[j
] == NULL
) {
2435 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
2439 #ifdef CONFIG_MAC80211_HT_DEBUG
2440 if (net_ratelimit())
2441 printk(KERN_DEBUG
"%s: release an RX reorder "
2442 "frame due to timeout on earlier "
2444 wiphy_name(hw
->wiphy
));
2446 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
2449 * Increment the head seq# also for the skipped slots.
2451 tid_agg_rx
->head_seq_num
=
2452 (tid_agg_rx
->head_seq_num
+ skipped
) &
2456 } else while (tid_agg_rx
->reorder_buf
[index
]) {
2457 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
2458 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2459 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
2464 static u8
ieee80211_rx_reorder_ampdu(struct ieee80211_local
*local
,
2465 struct sk_buff
*skb
,
2466 struct ieee80211_rx_status
*status
)
2468 struct ieee80211_hw
*hw
= &local
->hw
;
2469 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
2470 struct sta_info
*sta
;
2471 struct tid_ampdu_rx
*tid_agg_rx
;
2477 sta
= sta_info_get(local
, hdr
->addr2
);
2481 /* filter the QoS data rx stream according to
2482 * STA/TID and check if this STA/TID is on aggregation */
2483 if (!ieee80211_is_data_qos(hdr
->frame_control
))
2486 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
2488 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
2491 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
2493 /* qos null data frames are excluded */
2494 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
2497 /* new un-ordered ampdu frame - process it */
2499 /* reset session timer */
2500 if (tid_agg_rx
->timeout
)
2501 mod_timer(&tid_agg_rx
->session_timer
,
2502 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2504 /* if this mpdu is fragmented - terminate rx aggregation session */
2505 sc
= le16_to_cpu(hdr
->seq_ctrl
);
2506 if (sc
& IEEE80211_SCTL_FRAG
) {
2507 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
2508 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
2513 /* according to mpdu sequence number deal with reordering buffer */
2514 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
2515 ret
= ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
, status
,
2522 * This is the receive path handler. It is called by a low level driver when an
2523 * 802.11 MPDU is received from the hardware.
2525 void __ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2526 struct ieee80211_rx_status
*status
)
2528 struct ieee80211_local
*local
= hw_to_local(hw
);
2529 struct ieee80211_rate
*rate
= NULL
;
2530 struct ieee80211_supported_band
*sband
;
2532 if (status
->band
< 0 ||
2533 status
->band
>= IEEE80211_NUM_BANDS
) {
2538 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2544 if (status
->flag
& RX_FLAG_HT
) {
2545 /* rate_idx is MCS index */
2546 if (WARN_ON(status
->rate_idx
< 0 ||
2547 status
->rate_idx
>= 76))
2549 /* HT rates are not in the table - use the highest legacy rate
2550 * for now since other parts of mac80211 may not yet be fully
2552 rate
= &sband
->bitrates
[sband
->n_bitrates
- 1];
2554 if (WARN_ON(status
->rate_idx
< 0 ||
2555 status
->rate_idx
>= sband
->n_bitrates
))
2557 rate
= &sband
->bitrates
[status
->rate_idx
];
2561 * key references and virtual interfaces are protected using RCU
2562 * and this requires that we are in a read-side RCU section during
2563 * receive processing
2568 * Frames with failed FCS/PLCP checksum are not returned,
2569 * all other frames are returned without radiotap header
2570 * if it was previously present.
2571 * Also, frames with less than 16 bytes are dropped.
2573 skb
= ieee80211_rx_monitor(local
, skb
, status
, rate
);
2580 * In theory, the block ack reordering should happen after duplicate
2581 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2582 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2583 * happen as a new RX handler between ieee80211_rx_h_check and
2584 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2585 * the time being, the call can be here since RX reorder buf processing
2586 * will implicitly skip duplicates. We could, in theory at least,
2587 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2588 * frames from other than operational channel), but that should not
2589 * happen in normal networks.
2591 if (!ieee80211_rx_reorder_ampdu(local
, skb
, status
))
2592 __ieee80211_rx_handle_packet(hw
, skb
, status
, rate
);
2596 EXPORT_SYMBOL(__ieee80211_rx
);
2598 /* This is a version of the rx handler that can be called from hard irq
2599 * context. Post the skb on the queue and schedule the tasklet */
2600 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
2601 struct ieee80211_rx_status
*status
)
2603 struct ieee80211_local
*local
= hw_to_local(hw
);
2605 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2607 skb
->dev
= local
->mdev
;
2608 /* copy status into skb->cb for use by tasklet */
2609 memcpy(skb
->cb
, status
, sizeof(*status
));
2610 skb
->pkt_type
= IEEE80211_RX_MSG
;
2611 skb_queue_tail(&local
->skb_queue
, skb
);
2612 tasklet_schedule(&local
->tasklet
);
2614 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);