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
,
36 * monitor mode reception
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
41 static struct sk_buff
*remove_monitor_info(struct ieee80211_local
*local
,
44 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
) {
45 if (likely(skb
->len
> FCS_LEN
))
46 skb_trim(skb
, skb
->len
- FCS_LEN
);
58 static inline int should_drop_frame(struct sk_buff
*skb
,
61 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
62 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
64 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
66 if (unlikely(skb
->len
< 16 + present_fcs_len
))
68 if (ieee80211_is_ctl(hdr
->frame_control
) &&
69 !ieee80211_is_pspoll(hdr
->frame_control
) &&
70 !ieee80211_is_back_req(hdr
->frame_control
))
76 ieee80211_rx_radiotap_len(struct ieee80211_local
*local
,
77 struct ieee80211_rx_status
*status
)
81 /* always present fields */
82 len
= sizeof(struct ieee80211_radiotap_header
) + 9;
84 if (status
->flag
& RX_FLAG_TSFT
)
86 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
88 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
)
91 if (len
& 1) /* padding for RX_FLAGS if necessary */
98 * ieee80211_add_rx_radiotap_header - add radiotap header
100 * add a radiotap header containing all the fields which the hardware provided.
103 ieee80211_add_rx_radiotap_header(struct ieee80211_local
*local
,
105 struct ieee80211_rate
*rate
,
108 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
109 struct ieee80211_radiotap_header
*rthdr
;
113 rthdr
= (struct ieee80211_radiotap_header
*)skb_push(skb
, rtap_len
);
114 memset(rthdr
, 0, rtap_len
);
116 /* radiotap header, set always present flags */
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL
) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA
) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS
));
122 rthdr
->it_len
= cpu_to_le16(rtap_len
);
124 pos
= (unsigned char *)(rthdr
+1);
126 /* the order of the following fields is important */
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status
->flag
& RX_FLAG_TSFT
) {
130 put_unaligned_le64(status
->mactime
, pos
);
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT
);
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
138 *pos
|= IEEE80211_RADIOTAP_F_FCS
;
139 if (status
->flag
& (RX_FLAG_FAILED_FCS_CRC
| RX_FLAG_FAILED_PLCP_CRC
))
140 *pos
|= IEEE80211_RADIOTAP_F_BADFCS
;
141 if (status
->flag
& RX_FLAG_SHORTPRE
)
142 *pos
|= IEEE80211_RADIOTAP_F_SHORTPRE
;
145 /* IEEE80211_RADIOTAP_RATE */
146 if (status
->flag
& RX_FLAG_HT
) {
148 * TODO: add following information into radiotap header once
149 * suitable fields are defined for it:
150 * - MCS index (status->rate_idx)
151 * - HT40 (status->flag & RX_FLAG_40MHZ)
152 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
156 rthdr
->it_present
|= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE
);
157 *pos
= rate
->bitrate
/ 5;
161 /* IEEE80211_RADIOTAP_CHANNEL */
162 put_unaligned_le16(status
->freq
, pos
);
164 if (status
->band
== IEEE80211_BAND_5GHZ
)
165 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_5GHZ
,
167 else if (rate
->flags
& IEEE80211_RATE_ERP_G
)
168 put_unaligned_le16(IEEE80211_CHAN_OFDM
| IEEE80211_CHAN_2GHZ
,
171 put_unaligned_le16(IEEE80211_CHAN_CCK
| IEEE80211_CHAN_2GHZ
,
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
) {
177 *pos
= status
->signal
;
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL
);
183 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
184 if (local
->hw
.flags
& IEEE80211_HW_NOISE_DBM
) {
185 *pos
= status
->noise
;
187 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE
);
191 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
193 /* IEEE80211_RADIOTAP_ANTENNA */
194 *pos
= status
->antenna
;
197 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
199 /* IEEE80211_RADIOTAP_RX_FLAGS */
200 /* ensure 2 byte alignment for the 2 byte field as required */
201 if ((pos
- (u8
*)rthdr
) & 1)
203 if (status
->flag
& RX_FLAG_FAILED_PLCP_CRC
)
204 rx_flags
|= IEEE80211_RADIOTAP_F_RX_BADPLCP
;
205 put_unaligned_le16(rx_flags
, pos
);
210 * This function copies a received frame to all monitor interfaces and
211 * returns a cleaned-up SKB that no longer includes the FCS nor the
212 * radiotap header the driver might have added.
214 static struct sk_buff
*
215 ieee80211_rx_monitor(struct ieee80211_local
*local
, struct sk_buff
*origskb
,
216 struct ieee80211_rate
*rate
)
218 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(origskb
);
219 struct ieee80211_sub_if_data
*sdata
;
220 int needed_headroom
= 0;
221 struct sk_buff
*skb
, *skb2
;
222 struct net_device
*prev_dev
= NULL
;
223 int present_fcs_len
= 0;
226 * First, we may need to make a copy of the skb because
227 * (1) we need to modify it for radiotap (if not present), and
228 * (2) the other RX handlers will modify the skb we got.
230 * We don't need to, of course, if we aren't going to return
231 * the SKB because it has a bad FCS/PLCP checksum.
234 /* room for the radiotap header based on driver features */
235 needed_headroom
= ieee80211_rx_radiotap_len(local
, status
);
237 if (local
->hw
.flags
& IEEE80211_HW_RX_INCLUDES_FCS
)
238 present_fcs_len
= FCS_LEN
;
240 if (!local
->monitors
) {
241 if (should_drop_frame(origskb
, present_fcs_len
)) {
242 dev_kfree_skb(origskb
);
246 return remove_monitor_info(local
, origskb
);
249 if (should_drop_frame(origskb
, present_fcs_len
)) {
250 /* only need to expand headroom if necessary */
255 * This shouldn't trigger often because most devices have an
256 * RX header they pull before we get here, and that should
257 * be big enough for our radiotap information. We should
258 * probably export the length to drivers so that we can have
259 * them allocate enough headroom to start with.
261 if (skb_headroom(skb
) < needed_headroom
&&
262 pskb_expand_head(skb
, needed_headroom
, 0, GFP_ATOMIC
)) {
268 * Need to make a copy and possibly remove radiotap header
269 * and FCS from the original.
271 skb
= skb_copy_expand(origskb
, needed_headroom
, 0, GFP_ATOMIC
);
273 origskb
= remove_monitor_info(local
, origskb
);
279 /* prepend radiotap information */
280 ieee80211_add_rx_radiotap_header(local
, skb
, rate
, needed_headroom
);
282 skb_reset_mac_header(skb
);
283 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
284 skb
->pkt_type
= PACKET_OTHERHOST
;
285 skb
->protocol
= htons(ETH_P_802_2
);
287 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
288 if (!netif_running(sdata
->dev
))
291 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
)
294 if (sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
)
298 skb2
= skb_clone(skb
, GFP_ATOMIC
);
300 skb2
->dev
= prev_dev
;
305 prev_dev
= sdata
->dev
;
306 sdata
->dev
->stats
.rx_packets
++;
307 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
320 static void ieee80211_parse_qos(struct ieee80211_rx_data
*rx
)
322 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
325 /* does the frame have a qos control field? */
326 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
327 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
328 /* frame has qos control */
329 tid
= *qc
& IEEE80211_QOS_CTL_TID_MASK
;
330 if (*qc
& IEEE80211_QOS_CONTROL_A_MSDU_PRESENT
)
331 rx
->flags
|= IEEE80211_RX_AMSDU
;
333 rx
->flags
&= ~IEEE80211_RX_AMSDU
;
336 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
338 * Sequence numbers for management frames, QoS data
339 * frames with a broadcast/multicast address in the
340 * Address 1 field, and all non-QoS data frames sent
341 * by QoS STAs are assigned using an additional single
342 * modulo-4096 counter, [...]
344 * We also use that counter for non-QoS STAs.
346 tid
= NUM_RX_DATA_QUEUES
- 1;
350 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
351 * For now, set skb->priority to 0 for other cases. */
352 rx
->skb
->priority
= (tid
> 7) ? 0 : tid
;
356 * DOC: Packet alignment
358 * Drivers always need to pass packets that are aligned to two-byte boundaries
361 * Additionally, should, if possible, align the payload data in a way that
362 * guarantees that the contained IP header is aligned to a four-byte
363 * boundary. In the case of regular frames, this simply means aligning the
364 * payload to a four-byte boundary (because either the IP header is directly
365 * contained, or IV/RFC1042 headers that have a length divisible by four are
368 * With A-MSDU frames, however, the payload data address must yield two modulo
369 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
370 * push the IP header further back to a multiple of four again. Thankfully, the
371 * specs were sane enough this time around to require padding each A-MSDU
372 * subframe to a length that is a multiple of four.
374 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
375 * the payload is not supported, the driver is required to move the 802.11
376 * header to be directly in front of the payload in that case.
378 static void ieee80211_verify_alignment(struct ieee80211_rx_data
*rx
)
380 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
383 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
387 if (WARN_ONCE((unsigned long)rx
->skb
->data
& 1,
388 "unaligned packet at 0x%p\n", rx
->skb
->data
))
391 if (!ieee80211_is_data_present(hdr
->frame_control
))
394 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
395 if (rx
->flags
& IEEE80211_RX_AMSDU
)
397 WARN_ONCE(((unsigned long)(rx
->skb
->data
+ hdrlen
)) & 3,
398 "unaligned IP payload at 0x%p\n", rx
->skb
->data
+ hdrlen
);
404 static ieee80211_rx_result debug_noinline
405 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data
*rx
)
407 struct ieee80211_local
*local
= rx
->local
;
408 struct sk_buff
*skb
= rx
->skb
;
410 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
)))
411 return ieee80211_scan_rx(rx
->sdata
, skb
);
413 if (unlikely(test_bit(SCAN_SW_SCANNING
, &local
->scanning
) &&
414 (rx
->flags
& IEEE80211_RX_IN_SCAN
))) {
415 /* drop all the other packets during a software scan anyway */
416 if (ieee80211_scan_rx(rx
->sdata
, skb
) != RX_QUEUED
)
421 if (unlikely(rx
->flags
& IEEE80211_RX_IN_SCAN
)) {
422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local
->rx_handlers_drop_passive_scan
);
424 return RX_DROP_UNUSABLE
;
431 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff
*skb
)
433 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
435 if (skb
->len
< 24 || is_multicast_ether_addr(hdr
->addr1
))
438 return ieee80211_is_robust_mgmt_frame(hdr
);
442 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff
*skb
)
444 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
446 if (skb
->len
< 24 || !is_multicast_ether_addr(hdr
->addr1
))
449 return ieee80211_is_robust_mgmt_frame(hdr
);
453 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454 static int ieee80211_get_mmie_keyidx(struct sk_buff
*skb
)
456 struct ieee80211_mgmt
*hdr
= (struct ieee80211_mgmt
*) skb
->data
;
457 struct ieee80211_mmie
*mmie
;
459 if (skb
->len
< 24 + sizeof(*mmie
) ||
460 !is_multicast_ether_addr(hdr
->da
))
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr
*) hdr
))
464 return -1; /* not a robust management frame */
466 mmie
= (struct ieee80211_mmie
*)
467 (skb
->data
+ skb
->len
- sizeof(*mmie
));
468 if (mmie
->element_id
!= WLAN_EID_MMIE
||
469 mmie
->length
!= sizeof(*mmie
) - 2)
472 return le16_to_cpu(mmie
->key_id
);
476 static ieee80211_rx_result
477 ieee80211_rx_mesh_check(struct ieee80211_rx_data
*rx
)
479 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
480 unsigned int hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
481 char *dev_addr
= rx
->dev
->dev_addr
;
483 if (ieee80211_is_data(hdr
->frame_control
)) {
484 if (is_multicast_ether_addr(hdr
->addr1
)) {
485 if (ieee80211_has_tods(hdr
->frame_control
) ||
486 !ieee80211_has_fromds(hdr
->frame_control
))
487 return RX_DROP_MONITOR
;
488 if (memcmp(hdr
->addr3
, dev_addr
, ETH_ALEN
) == 0)
489 return RX_DROP_MONITOR
;
491 if (!ieee80211_has_a4(hdr
->frame_control
))
492 return RX_DROP_MONITOR
;
493 if (memcmp(hdr
->addr4
, dev_addr
, ETH_ALEN
) == 0)
494 return RX_DROP_MONITOR
;
498 /* If there is not an established peer link and this is not a peer link
499 * establisment frame, beacon or probe, drop the frame.
502 if (!rx
->sta
|| sta_plink_state(rx
->sta
) != PLINK_ESTAB
) {
503 struct ieee80211_mgmt
*mgmt
;
505 if (!ieee80211_is_mgmt(hdr
->frame_control
))
506 return RX_DROP_MONITOR
;
508 if (ieee80211_is_action(hdr
->frame_control
)) {
509 mgmt
= (struct ieee80211_mgmt
*)hdr
;
510 if (mgmt
->u
.action
.category
!= MESH_PLINK_CATEGORY
)
511 return RX_DROP_MONITOR
;
515 if (ieee80211_is_probe_req(hdr
->frame_control
) ||
516 ieee80211_is_probe_resp(hdr
->frame_control
) ||
517 ieee80211_is_beacon(hdr
->frame_control
))
520 return RX_DROP_MONITOR
;
524 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526 if (ieee80211_is_data(hdr
->frame_control
) &&
527 is_multicast_ether_addr(hdr
->addr1
) &&
528 mesh_rmc_check(hdr
->addr3
, msh_h_get(hdr
, hdrlen
), rx
->sdata
))
529 return RX_DROP_MONITOR
;
536 static ieee80211_rx_result debug_noinline
537 ieee80211_rx_h_check(struct ieee80211_rx_data
*rx
)
539 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
541 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
542 if (rx
->sta
&& !is_multicast_ether_addr(hdr
->addr1
)) {
543 if (unlikely(ieee80211_has_retry(hdr
->frame_control
) &&
544 rx
->sta
->last_seq_ctrl
[rx
->queue
] ==
546 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
547 rx
->local
->dot11FrameDuplicateCount
++;
548 rx
->sta
->num_duplicates
++;
550 return RX_DROP_MONITOR
;
552 rx
->sta
->last_seq_ctrl
[rx
->queue
] = hdr
->seq_ctrl
;
555 if (unlikely(rx
->skb
->len
< 16)) {
556 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_short
);
557 return RX_DROP_MONITOR
;
560 /* Drop disallowed frame classes based on STA auth/assoc state;
561 * IEEE 802.11, Chap 5.5.
563 * mac80211 filters only based on association state, i.e. it drops
564 * Class 3 frames from not associated stations. hostapd sends
565 * deauth/disassoc frames when needed. In addition, hostapd is
566 * responsible for filtering on both auth and assoc states.
569 if (ieee80211_vif_is_mesh(&rx
->sdata
->vif
))
570 return ieee80211_rx_mesh_check(rx
);
572 if (unlikely((ieee80211_is_data(hdr
->frame_control
) ||
573 ieee80211_is_pspoll(hdr
->frame_control
)) &&
574 rx
->sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
&&
575 (!rx
->sta
|| !test_sta_flags(rx
->sta
, WLAN_STA_ASSOC
)))) {
576 if ((!ieee80211_has_fromds(hdr
->frame_control
) &&
577 !ieee80211_has_tods(hdr
->frame_control
) &&
578 ieee80211_is_data(hdr
->frame_control
)) ||
579 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)) {
580 /* Drop IBSS frames and frames for other hosts
582 return RX_DROP_MONITOR
;
585 return RX_DROP_MONITOR
;
592 static ieee80211_rx_result debug_noinline
593 ieee80211_rx_h_decrypt(struct ieee80211_rx_data
*rx
)
595 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
598 ieee80211_rx_result result
= RX_DROP_UNUSABLE
;
599 struct ieee80211_key
*stakey
= NULL
;
600 int mmie_keyidx
= -1;
605 * There are four types of keys:
607 * - IGTK (group keys for management frames)
608 * - PTK (pairwise keys)
609 * - STK (station-to-station pairwise keys)
611 * When selecting a key, we have to distinguish between multicast
612 * (including broadcast) and unicast frames, the latter can only
613 * use PTKs and STKs while the former always use GTKs and IGTKs.
614 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
615 * unicast frames can also use key indices like GTKs. Hence, if we
616 * don't have a PTK/STK we check the key index for a WEP key.
618 * Note that in a regular BSS, multicast frames are sent by the
619 * AP only, associated stations unicast the frame to the AP first
620 * which then multicasts it on their behalf.
622 * There is also a slight problem in IBSS mode: GTKs are negotiated
623 * with each station, that is something we don't currently handle.
624 * The spec seems to expect that one negotiates the same key with
625 * every station but there's no such requirement; VLANs could be
630 * No point in finding a key and decrypting if the frame is neither
631 * addressed to us nor a multicast frame.
633 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
637 stakey
= rcu_dereference(rx
->sta
->key
);
639 if (!ieee80211_has_protected(hdr
->frame_control
))
640 mmie_keyidx
= ieee80211_get_mmie_keyidx(rx
->skb
);
642 if (!is_multicast_ether_addr(hdr
->addr1
) && stakey
) {
644 /* Skip decryption if the frame is not protected. */
645 if (!ieee80211_has_protected(hdr
->frame_control
))
647 } else if (mmie_keyidx
>= 0) {
648 /* Broadcast/multicast robust management frame / BIP */
649 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
650 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
653 if (mmie_keyidx
< NUM_DEFAULT_KEYS
||
654 mmie_keyidx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
655 return RX_DROP_MONITOR
; /* unexpected BIP keyidx */
656 rx
->key
= rcu_dereference(rx
->sdata
->keys
[mmie_keyidx
]);
657 } else if (!ieee80211_has_protected(hdr
->frame_control
)) {
659 * The frame was not protected, so skip decryption. However, we
660 * need to set rx->key if there is a key that could have been
661 * used so that the frame may be dropped if encryption would
662 * have been expected.
664 struct ieee80211_key
*key
= NULL
;
665 if (ieee80211_is_mgmt(hdr
->frame_control
) &&
666 is_multicast_ether_addr(hdr
->addr1
) &&
667 (key
= rcu_dereference(rx
->sdata
->default_mgmt_key
)))
669 else if ((key
= rcu_dereference(rx
->sdata
->default_key
)))
674 * The device doesn't give us the IV so we won't be
675 * able to look up the key. That's ok though, we
676 * don't need to decrypt the frame, we just won't
677 * be able to keep statistics accurate.
678 * Except for key threshold notifications, should
679 * we somehow allow the driver to tell us which key
680 * the hardware used if this flag is set?
682 if ((rx
->status
->flag
& RX_FLAG_DECRYPTED
) &&
683 (rx
->status
->flag
& RX_FLAG_IV_STRIPPED
))
686 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
688 if (rx
->skb
->len
< 8 + hdrlen
)
689 return RX_DROP_UNUSABLE
; /* TODO: count this? */
692 * no need to call ieee80211_wep_get_keyidx,
693 * it verifies a bunch of things we've done already
695 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
697 rx
->key
= rcu_dereference(rx
->sdata
->keys
[keyidx
]);
700 * RSNA-protected unicast frames should always be sent with
701 * pairwise or station-to-station keys, but for WEP we allow
702 * using a key index as well.
704 if (rx
->key
&& rx
->key
->conf
.alg
!= ALG_WEP
&&
705 !is_multicast_ether_addr(hdr
->addr1
))
710 rx
->key
->tx_rx_count
++;
711 /* TODO: add threshold stuff again */
713 return RX_DROP_MONITOR
;
716 /* Check for weak IVs if possible */
717 if (rx
->sta
&& rx
->key
->conf
.alg
== ALG_WEP
&&
718 ieee80211_is_data(hdr
->frame_control
) &&
719 (!(rx
->status
->flag
& RX_FLAG_IV_STRIPPED
) ||
720 !(rx
->status
->flag
& RX_FLAG_DECRYPTED
)) &&
721 ieee80211_wep_is_weak_iv(rx
->skb
, rx
->key
))
722 rx
->sta
->wep_weak_iv_count
++;
724 switch (rx
->key
->conf
.alg
) {
726 result
= ieee80211_crypto_wep_decrypt(rx
);
729 result
= ieee80211_crypto_tkip_decrypt(rx
);
732 result
= ieee80211_crypto_ccmp_decrypt(rx
);
735 result
= ieee80211_crypto_aes_cmac_decrypt(rx
);
739 /* either the frame has been decrypted or will be dropped */
740 rx
->status
->flag
|= RX_FLAG_DECRYPTED
;
745 static ieee80211_rx_result debug_noinline
746 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data
*rx
)
748 struct ieee80211_local
*local
;
749 struct ieee80211_hdr
*hdr
;
754 hdr
= (struct ieee80211_hdr
*) skb
->data
;
756 if (!local
->pspolling
)
759 if (!ieee80211_has_fromds(hdr
->frame_control
))
760 /* this is not from AP */
763 if (!ieee80211_is_data(hdr
->frame_control
))
766 if (!ieee80211_has_moredata(hdr
->frame_control
)) {
767 /* AP has no more frames buffered for us */
768 local
->pspolling
= false;
772 /* more data bit is set, let's request a new frame from the AP */
773 ieee80211_send_pspoll(local
, rx
->sdata
);
778 static void ap_sta_ps_start(struct sta_info
*sta
)
780 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
781 struct ieee80211_local
*local
= sdata
->local
;
783 atomic_inc(&sdata
->bss
->num_sta_ps
);
784 set_sta_flags(sta
, WLAN_STA_PS_STA
);
785 drv_sta_notify(local
, &sdata
->vif
, STA_NOTIFY_SLEEP
, &sta
->sta
);
786 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
787 printk(KERN_DEBUG
"%s: STA %pM aid %d enters power save mode\n",
788 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
789 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
792 static void ap_sta_ps_end(struct sta_info
*sta
)
794 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
796 atomic_dec(&sdata
->bss
->num_sta_ps
);
798 clear_sta_flags(sta
, WLAN_STA_PS_STA
);
800 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
801 printk(KERN_DEBUG
"%s: STA %pM aid %d exits power save mode\n",
802 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
803 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
805 if (test_sta_flags(sta
, WLAN_STA_PS_DRIVER
)) {
806 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
807 printk(KERN_DEBUG
"%s: STA %pM aid %d driver-ps-blocked\n",
808 sdata
->dev
->name
, sta
->sta
.addr
, sta
->sta
.aid
);
809 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
813 ieee80211_sta_ps_deliver_wakeup(sta
);
816 static ieee80211_rx_result debug_noinline
817 ieee80211_rx_h_sta_process(struct ieee80211_rx_data
*rx
)
819 struct sta_info
*sta
= rx
->sta
;
820 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
826 * Update last_rx only for IBSS packets which are for the current
827 * BSSID to avoid keeping the current IBSS network alive in cases
828 * where other STAs start using different BSSID.
830 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
831 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
,
832 NL80211_IFTYPE_ADHOC
);
833 if (compare_ether_addr(bssid
, rx
->sdata
->u
.ibss
.bssid
) == 0)
834 sta
->last_rx
= jiffies
;
835 } else if (!is_multicast_ether_addr(hdr
->addr1
)) {
837 * Mesh beacons will update last_rx when if they are found to
838 * match the current local configuration when processed.
840 sta
->last_rx
= jiffies
;
843 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
846 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
847 ieee80211_sta_rx_notify(rx
->sdata
, hdr
);
850 sta
->rx_bytes
+= rx
->skb
->len
;
851 sta
->last_signal
= rx
->status
->signal
;
852 sta
->last_noise
= rx
->status
->noise
;
855 * Change STA power saving mode only at the end of a frame
858 if (!ieee80211_has_morefrags(hdr
->frame_control
) &&
859 (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
860 rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)) {
861 if (test_sta_flags(sta
, WLAN_STA_PS_STA
)) {
863 * Ignore doze->wake transitions that are
864 * indicated by non-data frames, the standard
865 * is unclear here, but for example going to
866 * PS mode and then scanning would cause a
867 * doze->wake transition for the probe request,
868 * and that is clearly undesirable.
870 if (ieee80211_is_data(hdr
->frame_control
) &&
871 !ieee80211_has_pm(hdr
->frame_control
))
874 if (ieee80211_has_pm(hdr
->frame_control
))
875 ap_sta_ps_start(sta
);
880 * Drop (qos-)data::nullfunc frames silently, since they
881 * are used only to control station power saving mode.
883 if (ieee80211_is_nullfunc(hdr
->frame_control
) ||
884 ieee80211_is_qos_nullfunc(hdr
->frame_control
)) {
885 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_nullfunc
);
887 * Update counter and free packet here to avoid
888 * counting this as a dropped packed.
891 dev_kfree_skb(rx
->skb
);
896 } /* ieee80211_rx_h_sta_process */
898 static inline struct ieee80211_fragment_entry
*
899 ieee80211_reassemble_add(struct ieee80211_sub_if_data
*sdata
,
900 unsigned int frag
, unsigned int seq
, int rx_queue
,
901 struct sk_buff
**skb
)
903 struct ieee80211_fragment_entry
*entry
;
906 idx
= sdata
->fragment_next
;
907 entry
= &sdata
->fragments
[sdata
->fragment_next
++];
908 if (sdata
->fragment_next
>= IEEE80211_FRAGMENT_MAX
)
909 sdata
->fragment_next
= 0;
911 if (!skb_queue_empty(&entry
->skb_list
)) {
912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
913 struct ieee80211_hdr
*hdr
=
914 (struct ieee80211_hdr
*) entry
->skb_list
.next
->data
;
915 printk(KERN_DEBUG
"%s: RX reassembly removed oldest "
916 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
917 "addr1=%pM addr2=%pM\n",
918 sdata
->dev
->name
, idx
,
919 jiffies
- entry
->first_frag_time
, entry
->seq
,
920 entry
->last_frag
, hdr
->addr1
, hdr
->addr2
);
922 __skb_queue_purge(&entry
->skb_list
);
925 __skb_queue_tail(&entry
->skb_list
, *skb
); /* no need for locking */
927 entry
->first_frag_time
= jiffies
;
929 entry
->rx_queue
= rx_queue
;
930 entry
->last_frag
= frag
;
932 entry
->extra_len
= 0;
937 static inline struct ieee80211_fragment_entry
*
938 ieee80211_reassemble_find(struct ieee80211_sub_if_data
*sdata
,
939 unsigned int frag
, unsigned int seq
,
940 int rx_queue
, struct ieee80211_hdr
*hdr
)
942 struct ieee80211_fragment_entry
*entry
;
945 idx
= sdata
->fragment_next
;
946 for (i
= 0; i
< IEEE80211_FRAGMENT_MAX
; i
++) {
947 struct ieee80211_hdr
*f_hdr
;
951 idx
= IEEE80211_FRAGMENT_MAX
- 1;
953 entry
= &sdata
->fragments
[idx
];
954 if (skb_queue_empty(&entry
->skb_list
) || entry
->seq
!= seq
||
955 entry
->rx_queue
!= rx_queue
||
956 entry
->last_frag
+ 1 != frag
)
959 f_hdr
= (struct ieee80211_hdr
*)entry
->skb_list
.next
->data
;
962 * Check ftype and addresses are equal, else check next fragment
964 if (((hdr
->frame_control
^ f_hdr
->frame_control
) &
965 cpu_to_le16(IEEE80211_FCTL_FTYPE
)) ||
966 compare_ether_addr(hdr
->addr1
, f_hdr
->addr1
) != 0 ||
967 compare_ether_addr(hdr
->addr2
, f_hdr
->addr2
) != 0)
970 if (time_after(jiffies
, entry
->first_frag_time
+ 2 * HZ
)) {
971 __skb_queue_purge(&entry
->skb_list
);
980 static ieee80211_rx_result debug_noinline
981 ieee80211_rx_h_defragment(struct ieee80211_rx_data
*rx
)
983 struct ieee80211_hdr
*hdr
;
986 unsigned int frag
, seq
;
987 struct ieee80211_fragment_entry
*entry
;
990 hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
991 fc
= hdr
->frame_control
;
992 sc
= le16_to_cpu(hdr
->seq_ctrl
);
993 frag
= sc
& IEEE80211_SCTL_FRAG
;
995 if (likely((!ieee80211_has_morefrags(fc
) && frag
== 0) ||
996 (rx
->skb
)->len
< 24 ||
997 is_multicast_ether_addr(hdr
->addr1
))) {
1001 I802_DEBUG_INC(rx
->local
->rx_handlers_fragments
);
1003 seq
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
1006 /* This is the first fragment of a new frame. */
1007 entry
= ieee80211_reassemble_add(rx
->sdata
, frag
, seq
,
1008 rx
->queue
, &(rx
->skb
));
1009 if (rx
->key
&& rx
->key
->conf
.alg
== ALG_CCMP
&&
1010 ieee80211_has_protected(fc
)) {
1011 /* Store CCMP PN so that we can verify that the next
1012 * fragment has a sequential PN value. */
1014 memcpy(entry
->last_pn
,
1015 rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
],
1021 /* This is a fragment for a frame that should already be pending in
1022 * fragment cache. Add this fragment to the end of the pending entry.
1024 entry
= ieee80211_reassemble_find(rx
->sdata
, frag
, seq
, rx
->queue
, hdr
);
1026 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1027 return RX_DROP_MONITOR
;
1030 /* Verify that MPDUs within one MSDU have sequential PN values.
1031 * (IEEE 802.11i, 8.3.3.4.5) */
1034 u8 pn
[CCMP_PN_LEN
], *rpn
;
1035 if (!rx
->key
|| rx
->key
->conf
.alg
!= ALG_CCMP
)
1036 return RX_DROP_UNUSABLE
;
1037 memcpy(pn
, entry
->last_pn
, CCMP_PN_LEN
);
1038 for (i
= CCMP_PN_LEN
- 1; i
>= 0; i
--) {
1043 rpn
= rx
->key
->u
.ccmp
.rx_pn
[rx
->queue
];
1044 if (memcmp(pn
, rpn
, CCMP_PN_LEN
))
1045 return RX_DROP_UNUSABLE
;
1046 memcpy(entry
->last_pn
, pn
, CCMP_PN_LEN
);
1049 skb_pull(rx
->skb
, ieee80211_hdrlen(fc
));
1050 __skb_queue_tail(&entry
->skb_list
, rx
->skb
);
1051 entry
->last_frag
= frag
;
1052 entry
->extra_len
+= rx
->skb
->len
;
1053 if (ieee80211_has_morefrags(fc
)) {
1058 rx
->skb
= __skb_dequeue(&entry
->skb_list
);
1059 if (skb_tailroom(rx
->skb
) < entry
->extra_len
) {
1060 I802_DEBUG_INC(rx
->local
->rx_expand_skb_head2
);
1061 if (unlikely(pskb_expand_head(rx
->skb
, 0, entry
->extra_len
,
1063 I802_DEBUG_INC(rx
->local
->rx_handlers_drop_defrag
);
1064 __skb_queue_purge(&entry
->skb_list
);
1065 return RX_DROP_UNUSABLE
;
1068 while ((skb
= __skb_dequeue(&entry
->skb_list
))) {
1069 memcpy(skb_put(rx
->skb
, skb
->len
), skb
->data
, skb
->len
);
1073 /* Complete frame has been reassembled - process it now */
1074 rx
->flags
|= IEEE80211_RX_FRAGMENTED
;
1078 rx
->sta
->rx_packets
++;
1079 if (is_multicast_ether_addr(hdr
->addr1
))
1080 rx
->local
->dot11MulticastReceivedFrameCount
++;
1082 ieee80211_led_rx(rx
->local
);
1086 static ieee80211_rx_result debug_noinline
1087 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data
*rx
)
1089 struct ieee80211_sub_if_data
*sdata
= rx
->sdata
;
1090 __le16 fc
= ((struct ieee80211_hdr
*)rx
->skb
->data
)->frame_control
;
1092 if (likely(!rx
->sta
|| !ieee80211_is_pspoll(fc
) ||
1093 !(rx
->flags
& IEEE80211_RX_RA_MATCH
)))
1096 if ((sdata
->vif
.type
!= NL80211_IFTYPE_AP
) &&
1097 (sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
))
1098 return RX_DROP_UNUSABLE
;
1100 if (!test_sta_flags(rx
->sta
, WLAN_STA_PS_DRIVER
))
1101 ieee80211_sta_ps_deliver_poll_response(rx
->sta
);
1103 set_sta_flags(rx
->sta
, WLAN_STA_PSPOLL
);
1105 /* Free PS Poll skb here instead of returning RX_DROP that would
1106 * count as an dropped frame. */
1107 dev_kfree_skb(rx
->skb
);
1112 static ieee80211_rx_result debug_noinline
1113 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data
*rx
)
1115 u8
*data
= rx
->skb
->data
;
1116 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)data
;
1118 if (!ieee80211_is_data_qos(hdr
->frame_control
))
1121 /* remove the qos control field, update frame type and meta-data */
1122 memmove(data
+ IEEE80211_QOS_CTL_LEN
, data
,
1123 ieee80211_hdrlen(hdr
->frame_control
) - IEEE80211_QOS_CTL_LEN
);
1124 hdr
= (struct ieee80211_hdr
*)skb_pull(rx
->skb
, IEEE80211_QOS_CTL_LEN
);
1125 /* change frame type to non QOS */
1126 hdr
->frame_control
&= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA
);
1132 ieee80211_802_1x_port_control(struct ieee80211_rx_data
*rx
)
1134 if (unlikely(!rx
->sta
||
1135 !test_sta_flags(rx
->sta
, WLAN_STA_AUTHORIZED
)))
1142 ieee80211_drop_unencrypted(struct ieee80211_rx_data
*rx
, __le16 fc
)
1145 * Pass through unencrypted frames if the hardware has
1146 * decrypted them already.
1148 if (rx
->status
->flag
& RX_FLAG_DECRYPTED
)
1151 /* Drop unencrypted frames if key is set. */
1152 if (unlikely(!ieee80211_has_protected(fc
) &&
1153 !ieee80211_is_nullfunc(fc
) &&
1154 ieee80211_is_data(fc
) &&
1155 (rx
->key
|| rx
->sdata
->drop_unencrypted
)))
1157 if (rx
->sta
&& test_sta_flags(rx
->sta
, WLAN_STA_MFP
)) {
1158 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx
->skb
) &&
1161 /* BIP does not use Protected field, so need to check MMIE */
1162 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx
->skb
)
1163 && ieee80211_get_mmie_keyidx(rx
->skb
) < 0 &&
1167 * When using MFP, Action frames are not allowed prior to
1168 * having configured keys.
1170 if (unlikely(ieee80211_is_action(fc
) && !rx
->key
&&
1171 ieee80211_is_robust_mgmt_frame(
1172 (struct ieee80211_hdr
*) rx
->skb
->data
)))
1180 __ieee80211_data_to_8023(struct ieee80211_rx_data
*rx
)
1182 struct net_device
*dev
= rx
->dev
;
1183 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1184 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1186 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&& !sdata
->use_4addr
&&
1187 ieee80211_has_a4(hdr
->frame_control
))
1189 if (sdata
->use_4addr
&& is_multicast_ether_addr(hdr
->addr1
))
1192 return ieee80211_data_to_8023(rx
->skb
, dev
->dev_addr
, sdata
->vif
.type
);
1196 * requires that rx->skb is a frame with ethernet header
1198 static bool ieee80211_frame_allowed(struct ieee80211_rx_data
*rx
, __le16 fc
)
1200 static const u8 pae_group_addr
[ETH_ALEN
] __aligned(2)
1201 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1202 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1205 * Allow EAPOL frames to us/the PAE group address regardless
1206 * of whether the frame was encrypted or not.
1208 if (ehdr
->h_proto
== htons(ETH_P_PAE
) &&
1209 (compare_ether_addr(ehdr
->h_dest
, rx
->dev
->dev_addr
) == 0 ||
1210 compare_ether_addr(ehdr
->h_dest
, pae_group_addr
) == 0))
1213 if (ieee80211_802_1x_port_control(rx
) ||
1214 ieee80211_drop_unencrypted(rx
, fc
))
1221 * requires that rx->skb is a frame with ethernet header
1224 ieee80211_deliver_skb(struct ieee80211_rx_data
*rx
)
1226 struct net_device
*dev
= rx
->dev
;
1227 struct ieee80211_local
*local
= rx
->local
;
1228 struct sk_buff
*skb
, *xmit_skb
;
1229 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1230 struct ethhdr
*ehdr
= (struct ethhdr
*) rx
->skb
->data
;
1231 struct sta_info
*dsta
;
1236 if ((sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1237 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) &&
1238 !(sdata
->flags
& IEEE80211_SDATA_DONT_BRIDGE_PACKETS
) &&
1239 (rx
->flags
& IEEE80211_RX_RA_MATCH
) && !rx
->sdata
->use_4addr
) {
1240 if (is_multicast_ether_addr(ehdr
->h_dest
)) {
1242 * send multicast frames both to higher layers in
1243 * local net stack and back to the wireless medium
1245 xmit_skb
= skb_copy(skb
, GFP_ATOMIC
);
1246 if (!xmit_skb
&& net_ratelimit())
1247 printk(KERN_DEBUG
"%s: failed to clone "
1248 "multicast frame\n", dev
->name
);
1250 dsta
= sta_info_get(local
, skb
->data
);
1251 if (dsta
&& dsta
->sdata
->dev
== dev
) {
1253 * The destination station is associated to
1254 * this AP (in this VLAN), so send the frame
1255 * directly to it and do not pass it to local
1265 int align __maybe_unused
;
1267 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1269 * 'align' will only take the values 0 or 2 here
1270 * since all frames are required to be aligned
1271 * to 2-byte boundaries when being passed to
1272 * mac80211. That also explains the __skb_push()
1275 align
= ((unsigned long)(skb
->data
+ sizeof(struct ethhdr
))) & 3;
1277 if (WARN_ON(skb_headroom(skb
) < 3)) {
1281 u8
*data
= skb
->data
;
1282 size_t len
= skb_headlen(skb
);
1284 memmove(skb
->data
, data
, len
);
1285 skb_set_tail_pointer(skb
, len
);
1291 /* deliver to local stack */
1292 skb
->protocol
= eth_type_trans(skb
, dev
);
1293 memset(skb
->cb
, 0, sizeof(skb
->cb
));
1299 /* send to wireless media */
1300 xmit_skb
->protocol
= htons(ETH_P_802_3
);
1301 skb_reset_network_header(xmit_skb
);
1302 skb_reset_mac_header(xmit_skb
);
1303 dev_queue_xmit(xmit_skb
);
1307 static ieee80211_rx_result debug_noinline
1308 ieee80211_rx_h_amsdu(struct ieee80211_rx_data
*rx
)
1310 struct net_device
*dev
= rx
->dev
;
1311 struct ieee80211_local
*local
= rx
->local
;
1314 struct sk_buff
*skb
= rx
->skb
, *frame
= NULL
;
1315 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1316 __le16 fc
= hdr
->frame_control
;
1317 const struct ethhdr
*eth
;
1322 if (unlikely(!ieee80211_is_data(fc
)))
1325 if (unlikely(!ieee80211_is_data_present(fc
)))
1326 return RX_DROP_MONITOR
;
1328 if (!(rx
->flags
& IEEE80211_RX_AMSDU
))
1331 err
= __ieee80211_data_to_8023(rx
);
1333 return RX_DROP_UNUSABLE
;
1337 dev
->stats
.rx_packets
++;
1338 dev
->stats
.rx_bytes
+= skb
->len
;
1340 /* skip the wrapping header */
1341 eth
= (struct ethhdr
*) skb_pull(skb
, sizeof(struct ethhdr
));
1343 return RX_DROP_UNUSABLE
;
1345 while (skb
!= frame
) {
1347 __be16 len
= eth
->h_proto
;
1348 unsigned int subframe_len
= sizeof(struct ethhdr
) + ntohs(len
);
1350 remaining
= skb
->len
;
1351 memcpy(dst
, eth
->h_dest
, ETH_ALEN
);
1352 memcpy(src
, eth
->h_source
, ETH_ALEN
);
1354 padding
= ((4 - subframe_len
) & 0x3);
1355 /* the last MSDU has no padding */
1356 if (subframe_len
> remaining
)
1357 return RX_DROP_UNUSABLE
;
1359 skb_pull(skb
, sizeof(struct ethhdr
));
1360 /* if last subframe reuse skb */
1361 if (remaining
<= subframe_len
+ padding
)
1365 * Allocate and reserve two bytes more for payload
1366 * alignment since sizeof(struct ethhdr) is 14.
1368 frame
= dev_alloc_skb(
1369 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1373 return RX_DROP_UNUSABLE
;
1376 ALIGN(local
->hw
.extra_tx_headroom
, 4) +
1377 sizeof(struct ethhdr
) + 2);
1378 memcpy(skb_put(frame
, ntohs(len
)), skb
->data
,
1381 eth
= (struct ethhdr
*) skb_pull(skb
, ntohs(len
) +
1384 dev_kfree_skb(frame
);
1385 return RX_DROP_UNUSABLE
;
1389 skb_reset_network_header(frame
);
1391 frame
->priority
= skb
->priority
;
1394 payload
= frame
->data
;
1395 ethertype
= (payload
[6] << 8) | payload
[7];
1397 if (likely((compare_ether_addr(payload
, rfc1042_header
) == 0 &&
1398 ethertype
!= ETH_P_AARP
&& ethertype
!= ETH_P_IPX
) ||
1399 compare_ether_addr(payload
,
1400 bridge_tunnel_header
) == 0)) {
1401 /* remove RFC1042 or Bridge-Tunnel
1402 * encapsulation and replace EtherType */
1404 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1405 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1407 memcpy(skb_push(frame
, sizeof(__be16
)),
1408 &len
, sizeof(__be16
));
1409 memcpy(skb_push(frame
, ETH_ALEN
), src
, ETH_ALEN
);
1410 memcpy(skb_push(frame
, ETH_ALEN
), dst
, ETH_ALEN
);
1413 if (!ieee80211_frame_allowed(rx
, fc
)) {
1414 if (skb
== frame
) /* last frame */
1415 return RX_DROP_UNUSABLE
;
1416 dev_kfree_skb(frame
);
1420 ieee80211_deliver_skb(rx
);
1426 #ifdef CONFIG_MAC80211_MESH
1427 static ieee80211_rx_result
1428 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data
*rx
)
1430 struct ieee80211_hdr
*hdr
;
1431 struct ieee80211s_hdr
*mesh_hdr
;
1432 unsigned int hdrlen
;
1433 struct sk_buff
*skb
= rx
->skb
, *fwd_skb
;
1434 struct ieee80211_local
*local
= rx
->local
;
1435 struct ieee80211_sub_if_data
*sdata
;
1437 hdr
= (struct ieee80211_hdr
*) skb
->data
;
1438 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1439 mesh_hdr
= (struct ieee80211s_hdr
*) (skb
->data
+ hdrlen
);
1440 sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1442 if (!ieee80211_is_data(hdr
->frame_control
))
1447 return RX_DROP_MONITOR
;
1449 if (mesh_hdr
->flags
& MESH_FLAGS_AE
) {
1450 struct mesh_path
*mppath
;
1454 if (is_multicast_ether_addr(hdr
->addr1
)) {
1455 mpp_addr
= hdr
->addr3
;
1456 proxied_addr
= mesh_hdr
->eaddr1
;
1458 mpp_addr
= hdr
->addr4
;
1459 proxied_addr
= mesh_hdr
->eaddr2
;
1463 mppath
= mpp_path_lookup(proxied_addr
, sdata
);
1465 mpp_path_add(proxied_addr
, mpp_addr
, sdata
);
1467 spin_lock_bh(&mppath
->state_lock
);
1468 mppath
->exp_time
= jiffies
;
1469 if (compare_ether_addr(mppath
->mpp
, mpp_addr
) != 0)
1470 memcpy(mppath
->mpp
, mpp_addr
, ETH_ALEN
);
1471 spin_unlock_bh(&mppath
->state_lock
);
1476 /* Frame has reached destination. Don't forward */
1477 if (!is_multicast_ether_addr(hdr
->addr1
) &&
1478 compare_ether_addr(rx
->dev
->dev_addr
, hdr
->addr3
) == 0)
1483 if (rx
->flags
& IEEE80211_RX_RA_MATCH
) {
1485 IEEE80211_IFSTA_MESH_CTR_INC(&rx
->sdata
->u
.mesh
,
1486 dropped_frames_ttl
);
1488 struct ieee80211_hdr
*fwd_hdr
;
1489 struct ieee80211_tx_info
*info
;
1491 fwd_skb
= skb_copy(skb
, GFP_ATOMIC
);
1493 if (!fwd_skb
&& net_ratelimit())
1494 printk(KERN_DEBUG
"%s: failed to clone mesh frame\n",
1497 fwd_hdr
= (struct ieee80211_hdr
*) fwd_skb
->data
;
1498 memcpy(fwd_hdr
->addr2
, rx
->dev
->dev_addr
, ETH_ALEN
);
1499 info
= IEEE80211_SKB_CB(fwd_skb
);
1500 memset(info
, 0, sizeof(*info
));
1501 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1502 info
->control
.vif
= &rx
->sdata
->vif
;
1503 ieee80211_select_queue(local
, fwd_skb
);
1504 if (is_multicast_ether_addr(fwd_hdr
->addr1
))
1505 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1510 * Save TA to addr1 to send TA a path error if a
1511 * suitable next hop is not found
1513 memcpy(fwd_hdr
->addr1
, fwd_hdr
->addr2
,
1515 err
= mesh_nexthop_lookup(fwd_skb
, sdata
);
1516 /* Failed to immediately resolve next hop:
1517 * fwded frame was dropped or will be added
1518 * later to the pending skb queue. */
1520 return RX_DROP_MONITOR
;
1522 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1525 IEEE80211_IFSTA_MESH_CTR_INC(&sdata
->u
.mesh
,
1527 ieee80211_add_pending_skb(local
, fwd_skb
);
1531 if (is_multicast_ether_addr(hdr
->addr1
) ||
1532 rx
->dev
->flags
& IFF_PROMISC
)
1535 return RX_DROP_MONITOR
;
1539 static ieee80211_rx_result debug_noinline
1540 ieee80211_rx_h_data(struct ieee80211_rx_data
*rx
)
1542 struct net_device
*dev
= rx
->dev
;
1543 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
1544 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
1545 __le16 fc
= hdr
->frame_control
;
1548 if (unlikely(!ieee80211_is_data(hdr
->frame_control
)))
1551 if (unlikely(!ieee80211_is_data_present(hdr
->frame_control
)))
1552 return RX_DROP_MONITOR
;
1555 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1556 * that a 4-addr station can be detected and moved into a separate VLAN
1558 if (ieee80211_has_a4(hdr
->frame_control
) &&
1559 sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1560 return RX_DROP_MONITOR
;
1562 err
= __ieee80211_data_to_8023(rx
);
1564 return RX_DROP_UNUSABLE
;
1566 if (!ieee80211_frame_allowed(rx
, fc
))
1567 return RX_DROP_MONITOR
;
1571 dev
->stats
.rx_packets
++;
1572 dev
->stats
.rx_bytes
+= rx
->skb
->len
;
1574 ieee80211_deliver_skb(rx
);
1579 static ieee80211_rx_result debug_noinline
1580 ieee80211_rx_h_ctrl(struct ieee80211_rx_data
*rx
)
1582 struct ieee80211_local
*local
= rx
->local
;
1583 struct ieee80211_hw
*hw
= &local
->hw
;
1584 struct sk_buff
*skb
= rx
->skb
;
1585 struct ieee80211_bar
*bar
= (struct ieee80211_bar
*)skb
->data
;
1586 struct tid_ampdu_rx
*tid_agg_rx
;
1590 if (likely(!ieee80211_is_ctl(bar
->frame_control
)))
1593 if (ieee80211_is_back_req(bar
->frame_control
)) {
1596 tid
= le16_to_cpu(bar
->control
) >> 12;
1597 if (rx
->sta
->ampdu_mlme
.tid_state_rx
[tid
]
1598 != HT_AGG_STATE_OPERATIONAL
)
1600 tid_agg_rx
= rx
->sta
->ampdu_mlme
.tid_rx
[tid
];
1602 start_seq_num
= le16_to_cpu(bar
->start_seq_num
) >> 4;
1604 /* reset session timer */
1605 if (tid_agg_rx
->timeout
)
1606 mod_timer(&tid_agg_rx
->session_timer
,
1607 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
1609 /* manage reordering buffer according to requested */
1610 /* sequence number */
1612 ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, NULL
,
1615 return RX_DROP_UNUSABLE
;
1621 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data
*sdata
,
1622 struct ieee80211_mgmt
*mgmt
,
1625 struct ieee80211_local
*local
= sdata
->local
;
1626 struct sk_buff
*skb
;
1627 struct ieee80211_mgmt
*resp
;
1629 if (compare_ether_addr(mgmt
->da
, sdata
->dev
->dev_addr
) != 0) {
1630 /* Not to own unicast address */
1634 if (compare_ether_addr(mgmt
->sa
, sdata
->u
.mgd
.bssid
) != 0 ||
1635 compare_ether_addr(mgmt
->bssid
, sdata
->u
.mgd
.bssid
) != 0) {
1636 /* Not from the current AP or not associated yet. */
1640 if (len
< 24 + 1 + sizeof(resp
->u
.action
.u
.sa_query
)) {
1641 /* Too short SA Query request frame */
1645 skb
= dev_alloc_skb(sizeof(*resp
) + local
->hw
.extra_tx_headroom
);
1649 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1650 resp
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
1651 memset(resp
, 0, 24);
1652 memcpy(resp
->da
, mgmt
->sa
, ETH_ALEN
);
1653 memcpy(resp
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
1654 memcpy(resp
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
1655 resp
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
1656 IEEE80211_STYPE_ACTION
);
1657 skb_put(skb
, 1 + sizeof(resp
->u
.action
.u
.sa_query
));
1658 resp
->u
.action
.category
= WLAN_CATEGORY_SA_QUERY
;
1659 resp
->u
.action
.u
.sa_query
.action
= WLAN_ACTION_SA_QUERY_RESPONSE
;
1660 memcpy(resp
->u
.action
.u
.sa_query
.trans_id
,
1661 mgmt
->u
.action
.u
.sa_query
.trans_id
,
1662 WLAN_SA_QUERY_TR_ID_LEN
);
1664 ieee80211_tx_skb(sdata
, skb
, 1);
1667 static ieee80211_rx_result debug_noinline
1668 ieee80211_rx_h_action(struct ieee80211_rx_data
*rx
)
1670 struct ieee80211_local
*local
= rx
->local
;
1671 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1672 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
1673 int len
= rx
->skb
->len
;
1675 if (!ieee80211_is_action(mgmt
->frame_control
))
1679 return RX_DROP_MONITOR
;
1681 if (!(rx
->flags
& IEEE80211_RX_RA_MATCH
))
1682 return RX_DROP_MONITOR
;
1684 if (ieee80211_drop_unencrypted(rx
, mgmt
->frame_control
))
1685 return RX_DROP_MONITOR
;
1687 /* all categories we currently handle have action_code */
1688 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
1689 return RX_DROP_MONITOR
;
1691 switch (mgmt
->u
.action
.category
) {
1692 case WLAN_CATEGORY_BACK
:
1694 * The aggregation code is not prepared to handle
1695 * anything but STA/AP due to the BSSID handling;
1696 * IBSS could work in the code but isn't supported
1697 * by drivers or the standard.
1699 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
&&
1700 sdata
->vif
.type
!= NL80211_IFTYPE_AP_VLAN
&&
1701 sdata
->vif
.type
!= NL80211_IFTYPE_AP
)
1702 return RX_DROP_MONITOR
;
1704 switch (mgmt
->u
.action
.u
.addba_req
.action_code
) {
1705 case WLAN_ACTION_ADDBA_REQ
:
1706 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1707 sizeof(mgmt
->u
.action
.u
.addba_req
)))
1708 return RX_DROP_MONITOR
;
1709 ieee80211_process_addba_request(local
, rx
->sta
, mgmt
, len
);
1711 case WLAN_ACTION_ADDBA_RESP
:
1712 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1713 sizeof(mgmt
->u
.action
.u
.addba_resp
)))
1714 return RX_DROP_MONITOR
;
1715 ieee80211_process_addba_resp(local
, rx
->sta
, mgmt
, len
);
1717 case WLAN_ACTION_DELBA
:
1718 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1719 sizeof(mgmt
->u
.action
.u
.delba
)))
1720 return RX_DROP_MONITOR
;
1721 ieee80211_process_delba(sdata
, rx
->sta
, mgmt
, len
);
1725 case WLAN_CATEGORY_SPECTRUM_MGMT
:
1726 if (local
->hw
.conf
.channel
->band
!= IEEE80211_BAND_5GHZ
)
1727 return RX_DROP_MONITOR
;
1729 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1730 return RX_DROP_MONITOR
;
1732 switch (mgmt
->u
.action
.u
.measurement
.action_code
) {
1733 case WLAN_ACTION_SPCT_MSR_REQ
:
1734 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1735 sizeof(mgmt
->u
.action
.u
.measurement
)))
1736 return RX_DROP_MONITOR
;
1737 ieee80211_process_measurement_req(sdata
, mgmt
, len
);
1739 case WLAN_ACTION_SPCT_CHL_SWITCH
:
1740 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1741 sizeof(mgmt
->u
.action
.u
.chan_switch
)))
1742 return RX_DROP_MONITOR
;
1744 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1745 return RX_DROP_MONITOR
;
1747 if (memcmp(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
))
1748 return RX_DROP_MONITOR
;
1750 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
1753 case WLAN_CATEGORY_SA_QUERY
:
1754 if (len
< (IEEE80211_MIN_ACTION_SIZE
+
1755 sizeof(mgmt
->u
.action
.u
.sa_query
)))
1756 return RX_DROP_MONITOR
;
1757 switch (mgmt
->u
.action
.u
.sa_query
.action
) {
1758 case WLAN_ACTION_SA_QUERY_REQUEST
:
1759 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
1760 return RX_DROP_MONITOR
;
1761 ieee80211_process_sa_query_req(sdata
, mgmt
, len
);
1763 case WLAN_ACTION_SA_QUERY_RESPONSE
:
1765 * SA Query response is currently only used in AP mode
1766 * and it is processed in user space.
1775 rx
->sta
->rx_packets
++;
1776 dev_kfree_skb(rx
->skb
);
1780 static ieee80211_rx_result debug_noinline
1781 ieee80211_rx_h_mgmt(struct ieee80211_rx_data
*rx
)
1783 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(rx
->dev
);
1784 struct ieee80211_mgmt
*mgmt
= (struct ieee80211_mgmt
*) rx
->skb
->data
;
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 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1793 return ieee80211_mesh_rx_mgmt(sdata
, rx
->skb
);
1795 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
)
1796 return ieee80211_ibss_rx_mgmt(sdata
, rx
->skb
);
1798 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
1799 return ieee80211_sta_rx_mgmt(sdata
, rx
->skb
);
1801 return RX_DROP_MONITOR
;
1804 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr
*hdr
,
1805 struct ieee80211_rx_data
*rx
)
1808 unsigned int hdrlen
;
1810 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
1811 if (rx
->skb
->len
>= hdrlen
+ 4)
1812 keyidx
= rx
->skb
->data
[hdrlen
+ 3] >> 6;
1818 * Some hardware seem to generate incorrect Michael MIC
1819 * reports; ignore them to avoid triggering countermeasures.
1824 if (!ieee80211_has_protected(hdr
->frame_control
))
1827 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& keyidx
) {
1829 * APs with pairwise keys should never receive Michael MIC
1830 * errors for non-zero keyidx because these are reserved for
1831 * group keys and only the AP is sending real multicast
1832 * frames in the BSS.
1837 if (!ieee80211_is_data(hdr
->frame_control
) &&
1838 !ieee80211_is_auth(hdr
->frame_control
))
1841 mac80211_ev_michael_mic_failure(rx
->sdata
, keyidx
, hdr
, NULL
,
1845 /* TODO: use IEEE80211_RX_FRAGMENTED */
1846 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data
*rx
)
1848 struct ieee80211_sub_if_data
*sdata
;
1849 struct ieee80211_local
*local
= rx
->local
;
1850 struct ieee80211_rtap_hdr
{
1851 struct ieee80211_radiotap_header hdr
;
1856 } __attribute__ ((packed
)) *rthdr
;
1857 struct sk_buff
*skb
= rx
->skb
, *skb2
;
1858 struct net_device
*prev_dev
= NULL
;
1859 struct ieee80211_rx_status
*status
= rx
->status
;
1861 if (rx
->flags
& IEEE80211_RX_CMNTR_REPORTED
)
1864 if (skb_headroom(skb
) < sizeof(*rthdr
) &&
1865 pskb_expand_head(skb
, sizeof(*rthdr
), 0, GFP_ATOMIC
))
1868 rthdr
= (void *)skb_push(skb
, sizeof(*rthdr
));
1869 memset(rthdr
, 0, sizeof(*rthdr
));
1870 rthdr
->hdr
.it_len
= cpu_to_le16(sizeof(*rthdr
));
1871 rthdr
->hdr
.it_present
=
1872 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS
) |
1873 (1 << IEEE80211_RADIOTAP_RATE
) |
1874 (1 << IEEE80211_RADIOTAP_CHANNEL
));
1876 rthdr
->rate
= rx
->rate
->bitrate
/ 5;
1877 rthdr
->chan_freq
= cpu_to_le16(status
->freq
);
1879 if (status
->band
== IEEE80211_BAND_5GHZ
)
1880 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_OFDM
|
1881 IEEE80211_CHAN_5GHZ
);
1883 rthdr
->chan_flags
= cpu_to_le16(IEEE80211_CHAN_DYN
|
1884 IEEE80211_CHAN_2GHZ
);
1886 skb_set_mac_header(skb
, 0);
1887 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1888 skb
->pkt_type
= PACKET_OTHERHOST
;
1889 skb
->protocol
= htons(ETH_P_802_2
);
1891 list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
1892 if (!netif_running(sdata
->dev
))
1895 if (sdata
->vif
.type
!= NL80211_IFTYPE_MONITOR
||
1896 !(sdata
->u
.mntr_flags
& MONITOR_FLAG_COOK_FRAMES
))
1900 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1902 skb2
->dev
= prev_dev
;
1907 prev_dev
= sdata
->dev
;
1908 sdata
->dev
->stats
.rx_packets
++;
1909 sdata
->dev
->stats
.rx_bytes
+= skb
->len
;
1913 skb
->dev
= prev_dev
;
1919 rx
->flags
|= IEEE80211_RX_CMNTR_REPORTED
;
1927 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data
*sdata
,
1928 struct ieee80211_rx_data
*rx
,
1929 struct sk_buff
*skb
)
1931 ieee80211_rx_result res
= RX_DROP_MONITOR
;
1935 rx
->dev
= sdata
->dev
;
1937 #define CALL_RXH(rxh) \
1940 if (res != RX_CONTINUE) \
1944 CALL_RXH(ieee80211_rx_h_passive_scan
)
1945 CALL_RXH(ieee80211_rx_h_check
)
1946 CALL_RXH(ieee80211_rx_h_decrypt
)
1947 CALL_RXH(ieee80211_rx_h_check_more_data
)
1948 CALL_RXH(ieee80211_rx_h_sta_process
)
1949 CALL_RXH(ieee80211_rx_h_defragment
)
1950 CALL_RXH(ieee80211_rx_h_ps_poll
)
1951 CALL_RXH(ieee80211_rx_h_michael_mic_verify
)
1952 /* must be after MMIC verify so header is counted in MPDU mic */
1953 CALL_RXH(ieee80211_rx_h_remove_qos_control
)
1954 CALL_RXH(ieee80211_rx_h_amsdu
)
1955 #ifdef CONFIG_MAC80211_MESH
1956 if (ieee80211_vif_is_mesh(&sdata
->vif
))
1957 CALL_RXH(ieee80211_rx_h_mesh_fwding
);
1959 CALL_RXH(ieee80211_rx_h_data
)
1960 CALL_RXH(ieee80211_rx_h_ctrl
)
1961 CALL_RXH(ieee80211_rx_h_action
)
1962 CALL_RXH(ieee80211_rx_h_mgmt
)
1968 case RX_DROP_MONITOR
:
1969 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
1971 rx
->sta
->rx_dropped
++;
1974 ieee80211_rx_cooked_monitor(rx
);
1976 case RX_DROP_UNUSABLE
:
1977 I802_DEBUG_INC(sdata
->local
->rx_handlers_drop
);
1979 rx
->sta
->rx_dropped
++;
1980 dev_kfree_skb(rx
->skb
);
1983 I802_DEBUG_INC(sdata
->local
->rx_handlers_queued
);
1988 /* main receive path */
1990 static int prepare_for_handlers(struct ieee80211_sub_if_data
*sdata
,
1991 struct ieee80211_rx_data
*rx
,
1992 struct ieee80211_hdr
*hdr
)
1994 u8
*bssid
= ieee80211_get_bssid(hdr
, rx
->skb
->len
, sdata
->vif
.type
);
1995 int multicast
= is_multicast_ether_addr(hdr
->addr1
);
1997 switch (sdata
->vif
.type
) {
1998 case NL80211_IFTYPE_STATION
:
1999 if (!bssid
&& !sdata
->use_4addr
)
2002 compare_ether_addr(sdata
->dev
->dev_addr
, hdr
->addr1
) != 0) {
2003 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2005 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2008 case NL80211_IFTYPE_ADHOC
:
2011 if (ieee80211_is_beacon(hdr
->frame_control
)) {
2014 else if (!ieee80211_bssid_match(bssid
, sdata
->u
.ibss
.bssid
)) {
2015 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2017 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2018 } else if (!multicast
&&
2019 compare_ether_addr(sdata
->dev
->dev_addr
,
2021 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2023 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2024 } else if (!rx
->sta
) {
2026 if (rx
->status
->flag
& RX_FLAG_HT
)
2027 rate_idx
= 0; /* TODO: HT rates */
2029 rate_idx
= rx
->status
->rate_idx
;
2030 rx
->sta
= ieee80211_ibss_add_sta(sdata
, bssid
, hdr
->addr2
,
2034 case NL80211_IFTYPE_MESH_POINT
:
2036 compare_ether_addr(sdata
->dev
->dev_addr
,
2038 if (!(sdata
->dev
->flags
& IFF_PROMISC
))
2041 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2044 case NL80211_IFTYPE_AP_VLAN
:
2045 case NL80211_IFTYPE_AP
:
2047 if (compare_ether_addr(sdata
->dev
->dev_addr
,
2050 } else if (!ieee80211_bssid_match(bssid
,
2051 sdata
->dev
->dev_addr
)) {
2052 if (!(rx
->flags
& IEEE80211_RX_IN_SCAN
))
2054 rx
->flags
&= ~IEEE80211_RX_RA_MATCH
;
2057 case NL80211_IFTYPE_WDS
:
2058 if (bssid
|| !ieee80211_is_data(hdr
->frame_control
))
2060 if (compare_ether_addr(sdata
->u
.wds
.remote_addr
, hdr
->addr2
))
2063 case NL80211_IFTYPE_MONITOR
:
2064 case NL80211_IFTYPE_UNSPECIFIED
:
2065 case __NL80211_IFTYPE_AFTER_LAST
:
2066 /* should never get here */
2075 * This is the actual Rx frames handler. as it blongs to Rx path it must
2076 * be called with rcu_read_lock protection.
2078 static void __ieee80211_rx_handle_packet(struct ieee80211_hw
*hw
,
2079 struct sk_buff
*skb
,
2080 struct ieee80211_rate
*rate
)
2082 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2083 struct ieee80211_local
*local
= hw_to_local(hw
);
2084 struct ieee80211_sub_if_data
*sdata
;
2085 struct ieee80211_hdr
*hdr
;
2086 struct ieee80211_rx_data rx
;
2088 struct ieee80211_sub_if_data
*prev
= NULL
;
2089 struct sk_buff
*skb_new
;
2091 hdr
= (struct ieee80211_hdr
*)skb
->data
;
2092 memset(&rx
, 0, sizeof(rx
));
2098 if (ieee80211_is_data(hdr
->frame_control
) || ieee80211_is_mgmt(hdr
->frame_control
))
2099 local
->dot11ReceivedFragmentCount
++;
2101 if (unlikely(test_bit(SCAN_HW_SCANNING
, &local
->scanning
) ||
2102 test_bit(SCAN_OFF_CHANNEL
, &local
->scanning
)))
2103 rx
.flags
|= IEEE80211_RX_IN_SCAN
;
2105 ieee80211_parse_qos(&rx
);
2106 ieee80211_verify_alignment(&rx
);
2108 rx
.sta
= sta_info_get(local
, hdr
->addr2
);
2110 rx
.sdata
= rx
.sta
->sdata
;
2111 rx
.dev
= rx
.sta
->sdata
->dev
;
2114 if (rx
.sdata
&& ieee80211_is_data(hdr
->frame_control
)) {
2115 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2116 prepares
= prepare_for_handlers(rx
.sdata
, &rx
, hdr
);
2118 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2119 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2120 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2124 } else list_for_each_entry_rcu(sdata
, &local
->interfaces
, list
) {
2125 if (!netif_running(sdata
->dev
))
2128 if (sdata
->vif
.type
== NL80211_IFTYPE_MONITOR
||
2129 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
2132 rx
.flags
|= IEEE80211_RX_RA_MATCH
;
2133 prepares
= prepare_for_handlers(sdata
, &rx
, hdr
);
2138 if (status
->flag
& RX_FLAG_MMIC_ERROR
) {
2140 if (rx
.flags
& IEEE80211_RX_RA_MATCH
)
2141 ieee80211_rx_michael_mic_report(hdr
, &rx
);
2146 * frame is destined for this interface, but if it's not
2147 * also for the previous one we handle that after the
2148 * loop to avoid copying the SKB once too much
2157 * frame was destined for the previous interface
2158 * so invoke RX handlers for it
2161 skb_new
= skb_copy(skb
, GFP_ATOMIC
);
2163 if (net_ratelimit())
2164 printk(KERN_DEBUG
"%s: failed to copy "
2165 "multicast frame for %s\n",
2166 wiphy_name(local
->hw
.wiphy
),
2170 ieee80211_invoke_rx_handlers(prev
, &rx
, skb_new
);
2174 ieee80211_invoke_rx_handlers(prev
, &rx
, skb
);
2179 #define SEQ_MODULO 0x1000
2180 #define SEQ_MASK 0xfff
2182 static inline int seq_less(u16 sq1
, u16 sq2
)
2184 return ((sq1
- sq2
) & SEQ_MASK
) > (SEQ_MODULO
>> 1);
2187 static inline u16
seq_inc(u16 sq
)
2189 return (sq
+ 1) & SEQ_MASK
;
2192 static inline u16
seq_sub(u16 sq1
, u16 sq2
)
2194 return (sq1
- sq2
) & SEQ_MASK
;
2198 static void ieee80211_release_reorder_frame(struct ieee80211_hw
*hw
,
2199 struct tid_ampdu_rx
*tid_agg_rx
,
2202 struct ieee80211_supported_band
*sband
;
2203 struct ieee80211_rate
*rate
;
2204 struct sk_buff
*skb
= tid_agg_rx
->reorder_buf
[index
];
2205 struct ieee80211_rx_status
*status
;
2210 status
= IEEE80211_SKB_RXCB(skb
);
2212 /* release the reordered frames to stack */
2213 sband
= hw
->wiphy
->bands
[status
->band
];
2214 if (status
->flag
& RX_FLAG_HT
)
2215 rate
= sband
->bitrates
; /* TODO: HT rates */
2217 rate
= &sband
->bitrates
[status
->rate_idx
];
2218 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2219 tid_agg_rx
->stored_mpdu_num
--;
2220 tid_agg_rx
->reorder_buf
[index
] = NULL
;
2223 tid_agg_rx
->head_seq_num
= seq_inc(tid_agg_rx
->head_seq_num
);
2228 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2229 * the skb was added to the buffer longer than this time ago, the earlier
2230 * frames that have not yet been received are assumed to be lost and the skb
2231 * can be released for processing. This may also release other skb's from the
2232 * reorder buffer if there are no additional gaps between the frames.
2234 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2237 * As it function blongs to Rx path it must be called with
2238 * the proper rcu_read_lock protection for its flow.
2240 static u8
ieee80211_sta_manage_reorder_buf(struct ieee80211_hw
*hw
,
2241 struct tid_ampdu_rx
*tid_agg_rx
,
2242 struct sk_buff
*skb
,
2246 u16 head_seq_num
, buf_size
;
2249 buf_size
= tid_agg_rx
->buf_size
;
2250 head_seq_num
= tid_agg_rx
->head_seq_num
;
2252 /* frame with out of date sequence number */
2253 if (seq_less(mpdu_seq_num
, head_seq_num
)) {
2258 /* if frame sequence number exceeds our buffering window size or
2259 * block Ack Request arrived - release stored frames */
2260 if ((!seq_less(mpdu_seq_num
, head_seq_num
+ buf_size
)) || (bar_req
)) {
2261 /* new head to the ordering buffer */
2263 head_seq_num
= mpdu_seq_num
;
2266 seq_inc(seq_sub(mpdu_seq_num
, buf_size
));
2267 /* release stored frames up to new head to stack */
2268 while (seq_less(tid_agg_rx
->head_seq_num
, head_seq_num
)) {
2269 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2271 % tid_agg_rx
->buf_size
;
2272 ieee80211_release_reorder_frame(hw
, tid_agg_rx
,
2279 /* now the new frame is always in the range of the reordering */
2281 index
= seq_sub(mpdu_seq_num
, tid_agg_rx
->ssn
)
2282 % tid_agg_rx
->buf_size
;
2283 /* check if we already stored this frame */
2284 if (tid_agg_rx
->reorder_buf
[index
]) {
2289 /* if arrived mpdu is in the right order and nothing else stored */
2290 /* release it immediately */
2291 if (mpdu_seq_num
== tid_agg_rx
->head_seq_num
&&
2292 tid_agg_rx
->stored_mpdu_num
== 0) {
2293 tid_agg_rx
->head_seq_num
=
2294 seq_inc(tid_agg_rx
->head_seq_num
);
2298 /* put the frame in the reordering buffer */
2299 tid_agg_rx
->reorder_buf
[index
] = skb
;
2300 tid_agg_rx
->reorder_time
[index
] = jiffies
;
2301 tid_agg_rx
->stored_mpdu_num
++;
2302 /* release the buffer until next missing frame */
2303 index
= seq_sub(tid_agg_rx
->head_seq_num
, tid_agg_rx
->ssn
)
2304 % tid_agg_rx
->buf_size
;
2305 if (!tid_agg_rx
->reorder_buf
[index
] &&
2306 tid_agg_rx
->stored_mpdu_num
> 1) {
2308 * No buffers ready to be released, but check whether any
2309 * frames in the reorder buffer have timed out.
2313 for (j
= (index
+ 1) % tid_agg_rx
->buf_size
; j
!= index
;
2314 j
= (j
+ 1) % tid_agg_rx
->buf_size
) {
2315 if (tid_agg_rx
->reorder_buf
[j
] == NULL
) {
2319 if (!time_after(jiffies
, tid_agg_rx
->reorder_time
[j
] +
2323 #ifdef CONFIG_MAC80211_HT_DEBUG
2324 if (net_ratelimit())
2325 printk(KERN_DEBUG
"%s: release an RX reorder "
2326 "frame due to timeout on earlier "
2328 wiphy_name(hw
->wiphy
));
2330 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, j
);
2333 * Increment the head seq# also for the skipped slots.
2335 tid_agg_rx
->head_seq_num
=
2336 (tid_agg_rx
->head_seq_num
+ skipped
) &
2340 } else while (tid_agg_rx
->reorder_buf
[index
]) {
2341 ieee80211_release_reorder_frame(hw
, tid_agg_rx
, index
);
2342 index
= seq_sub(tid_agg_rx
->head_seq_num
,
2343 tid_agg_rx
->ssn
) % tid_agg_rx
->buf_size
;
2348 static u8
ieee80211_rx_reorder_ampdu(struct ieee80211_local
*local
,
2349 struct sk_buff
*skb
)
2351 struct ieee80211_hw
*hw
= &local
->hw
;
2352 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
2353 struct sta_info
*sta
;
2354 struct tid_ampdu_rx
*tid_agg_rx
;
2360 sta
= sta_info_get(local
, hdr
->addr2
);
2364 /* filter the QoS data rx stream according to
2365 * STA/TID and check if this STA/TID is on aggregation */
2366 if (!ieee80211_is_data_qos(hdr
->frame_control
))
2369 tid
= *ieee80211_get_qos_ctl(hdr
) & IEEE80211_QOS_CTL_TID_MASK
;
2371 if (sta
->ampdu_mlme
.tid_state_rx
[tid
] != HT_AGG_STATE_OPERATIONAL
)
2374 tid_agg_rx
= sta
->ampdu_mlme
.tid_rx
[tid
];
2376 /* qos null data frames are excluded */
2377 if (unlikely(hdr
->frame_control
& cpu_to_le16(IEEE80211_STYPE_NULLFUNC
)))
2380 /* new un-ordered ampdu frame - process it */
2382 /* reset session timer */
2383 if (tid_agg_rx
->timeout
)
2384 mod_timer(&tid_agg_rx
->session_timer
,
2385 TU_TO_EXP_TIME(tid_agg_rx
->timeout
));
2387 /* if this mpdu is fragmented - terminate rx aggregation session */
2388 sc
= le16_to_cpu(hdr
->seq_ctrl
);
2389 if (sc
& IEEE80211_SCTL_FRAG
) {
2390 ieee80211_sta_stop_rx_ba_session(sta
->sdata
, sta
->sta
.addr
,
2391 tid
, 0, WLAN_REASON_QSTA_REQUIRE_SETUP
);
2396 /* according to mpdu sequence number deal with reordering buffer */
2397 mpdu_seq_num
= (sc
& IEEE80211_SCTL_SEQ
) >> 4;
2398 ret
= ieee80211_sta_manage_reorder_buf(hw
, tid_agg_rx
, skb
,
2405 * This is the receive path handler. It is called by a low level driver when an
2406 * 802.11 MPDU is received from the hardware.
2408 void ieee80211_rx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2410 struct ieee80211_local
*local
= hw_to_local(hw
);
2411 struct ieee80211_rate
*rate
= NULL
;
2412 struct ieee80211_supported_band
*sband
;
2413 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
2415 WARN_ON_ONCE(softirq_count() == 0);
2417 if (WARN_ON(status
->band
< 0 ||
2418 status
->band
>= IEEE80211_NUM_BANDS
))
2421 sband
= local
->hw
.wiphy
->bands
[status
->band
];
2422 if (WARN_ON(!sband
))
2426 * If we're suspending, it is possible although not too likely
2427 * that we'd be receiving frames after having already partially
2428 * quiesced the stack. We can't process such frames then since
2429 * that might, for example, cause stations to be added or other
2430 * driver callbacks be invoked.
2432 if (unlikely(local
->quiescing
|| local
->suspended
))
2436 * The same happens when we're not even started,
2437 * but that's worth a warning.
2439 if (WARN_ON(!local
->started
))
2442 if (status
->flag
& RX_FLAG_HT
) {
2444 * rate_idx is MCS index, which can be [0-76] as documented on:
2446 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2448 * Anything else would be some sort of driver or hardware error.
2449 * The driver should catch hardware errors.
2451 if (WARN((status
->rate_idx
< 0 ||
2452 status
->rate_idx
> 76),
2453 "Rate marked as an HT rate but passed "
2454 "status->rate_idx is not "
2455 "an MCS index [0-76]: %d (0x%02x)\n",
2459 /* HT rates are not in the table - use the highest legacy rate
2460 * for now since other parts of mac80211 may not yet be fully
2462 rate
= &sband
->bitrates
[sband
->n_bitrates
- 1];
2464 if (WARN_ON(status
->rate_idx
< 0 ||
2465 status
->rate_idx
>= sband
->n_bitrates
))
2467 rate
= &sband
->bitrates
[status
->rate_idx
];
2471 * key references and virtual interfaces are protected using RCU
2472 * and this requires that we are in a read-side RCU section during
2473 * receive processing
2478 * Frames with failed FCS/PLCP checksum are not returned,
2479 * all other frames are returned without radiotap header
2480 * if it was previously present.
2481 * Also, frames with less than 16 bytes are dropped.
2483 skb
= ieee80211_rx_monitor(local
, skb
, rate
);
2490 * In theory, the block ack reordering should happen after duplicate
2491 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2492 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2493 * happen as a new RX handler between ieee80211_rx_h_check and
2494 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2495 * the time being, the call can be here since RX reorder buf processing
2496 * will implicitly skip duplicates. We could, in theory at least,
2497 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2498 * frames from other than operational channel), but that should not
2499 * happen in normal networks.
2501 if (!ieee80211_rx_reorder_ampdu(local
, skb
))
2502 __ieee80211_rx_handle_packet(hw
, skb
, rate
);
2510 EXPORT_SYMBOL(ieee80211_rx
);
2512 /* This is a version of the rx handler that can be called from hard irq
2513 * context. Post the skb on the queue and schedule the tasklet */
2514 void ieee80211_rx_irqsafe(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
2516 struct ieee80211_local
*local
= hw_to_local(hw
);
2518 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status
) > sizeof(skb
->cb
));
2520 skb
->pkt_type
= IEEE80211_RX_MSG
;
2521 skb_queue_tail(&local
->skb_queue
, skb
);
2522 tasklet_schedule(&local
->tasklet
);
2524 EXPORT_SYMBOL(ieee80211_rx_irqsafe
);