airo: correct improper initialization of local variable
[firewire-audio.git] / net / mac80211 / rx.c
blob66f7ecf51b924078a8ea52e6f88e85c3ff1f07d4
1 /*
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 "led.h"
23 #include "mesh.h"
24 #include "wep.h"
25 #include "wpa.h"
26 #include "tkip.h"
27 #include "wme.h"
29 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb,
32 u16 mpdu_seq_num,
33 int bar_req);
35 * monitor mode reception
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 struct sk_buff *skb,
42 int rtap_len)
44 skb_pull(skb, rtap_len);
46 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
47 if (likely(skb->len > FCS_LEN))
48 skb_trim(skb, skb->len - FCS_LEN);
49 else {
50 /* driver bug */
51 WARN_ON(1);
52 dev_kfree_skb(skb);
53 skb = NULL;
57 return skb;
60 static inline int should_drop_frame(struct ieee80211_rx_status *status,
61 struct sk_buff *skb,
62 int present_fcs_len,
63 int radiotap_len)
65 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
67 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
68 return 1;
69 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
70 return 1;
71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
74 return 1;
75 return 0;
78 static int
79 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
80 struct ieee80211_rx_status *status)
82 int len;
84 /* always present fields */
85 len = sizeof(struct ieee80211_radiotap_header) + 9;
87 if (status->flag & RX_FLAG_TSFT)
88 len += 8;
89 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90 len += 1;
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92 len += 1;
94 if (len & 1) /* padding for RX_FLAGS if necessary */
95 len++;
97 /* make sure radiotap starts at a naturally aligned address */
98 if (len % 8)
99 len = roundup(len, 8);
101 return len;
105 * ieee80211_add_rx_radiotap_header - add radiotap header
107 * add a radiotap header containing all the fields which the hardware provided.
109 static void
110 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111 struct sk_buff *skb,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
114 int rtap_len)
116 struct ieee80211_radiotap_header *rthdr;
117 unsigned char *pos;
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
122 /* radiotap header, set always present flags */
123 rthdr->it_present =
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_CHANNEL) |
126 (1 << IEEE80211_RADIOTAP_ANTENNA) |
127 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
128 rthdr->it_len = cpu_to_le16(rtap_len);
130 pos = (unsigned char *)(rthdr+1);
132 /* the order of the following fields is important */
134 /* IEEE80211_RADIOTAP_TSFT */
135 if (status->flag & RX_FLAG_TSFT) {
136 *(__le64 *)pos = cpu_to_le64(status->mactime);
137 rthdr->it_present |=
138 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
139 pos += 8;
142 /* IEEE80211_RADIOTAP_FLAGS */
143 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
144 *pos |= IEEE80211_RADIOTAP_F_FCS;
145 if (status->flag & RX_FLAG_SHORTPRE)
146 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
147 pos++;
149 /* IEEE80211_RADIOTAP_RATE */
150 if (status->flag & RX_FLAG_HT) {
152 * TODO: add following information into radiotap header once
153 * suitable fields are defined for it:
154 * - MCS index (status->rate_idx)
155 * - HT40 (status->flag & RX_FLAG_40MHZ)
156 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
158 *pos = 0;
159 } else {
160 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
161 *pos = rate->bitrate / 5;
163 pos++;
165 /* IEEE80211_RADIOTAP_CHANNEL */
166 *(__le16 *)pos = cpu_to_le16(status->freq);
167 pos += 2;
168 if (status->band == IEEE80211_BAND_5GHZ)
169 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
170 IEEE80211_CHAN_5GHZ);
171 else if (rate->flags & IEEE80211_RATE_ERP_G)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_2GHZ);
174 else
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
176 IEEE80211_CHAN_2GHZ);
177 pos += 2;
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
181 *pos = status->signal;
182 rthdr->it_present |=
183 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
184 pos++;
187 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
188 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
189 *pos = status->noise;
190 rthdr->it_present |=
191 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
192 pos++;
195 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
197 /* IEEE80211_RADIOTAP_ANTENNA */
198 *pos = status->antenna;
199 pos++;
201 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
203 /* IEEE80211_RADIOTAP_RX_FLAGS */
204 /* ensure 2 byte alignment for the 2 byte field as required */
205 if ((pos - (unsigned char *)rthdr) & 1)
206 pos++;
207 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
208 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
209 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
210 pos += 2;
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
218 static struct sk_buff *
219 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
220 struct ieee80211_rx_status *status,
221 struct ieee80211_rate *rate)
223 struct ieee80211_sub_if_data *sdata;
224 int needed_headroom = 0;
225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
228 int rtap_len = 0;
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
238 if (status->flag & RX_FLAG_RADIOTAP)
239 rtap_len = ieee80211_get_radiotap_len(origskb->data);
240 else
241 /* room for the radiotap header based on driver features */
242 needed_headroom = ieee80211_rx_radiotap_len(local, status);
244 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
245 present_fcs_len = FCS_LEN;
247 if (!local->monitors) {
248 if (should_drop_frame(status, origskb, present_fcs_len,
249 rtap_len)) {
250 dev_kfree_skb(origskb);
251 return NULL;
254 return remove_monitor_info(local, origskb, rtap_len);
257 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
258 /* only need to expand headroom if necessary */
259 skb = origskb;
260 origskb = NULL;
263 * This shouldn't trigger often because most devices have an
264 * RX header they pull before we get here, and that should
265 * be big enough for our radiotap information. We should
266 * probably export the length to drivers so that we can have
267 * them allocate enough headroom to start with.
269 if (skb_headroom(skb) < needed_headroom &&
270 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
271 dev_kfree_skb(skb);
272 return NULL;
274 } else {
276 * Need to make a copy and possibly remove radiotap header
277 * and FCS from the original.
279 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281 origskb = remove_monitor_info(local, origskb, rtap_len);
283 if (!skb)
284 return origskb;
287 /* if necessary, prepend radiotap information */
288 if (!(status->flag & RX_FLAG_RADIOTAP))
289 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
290 needed_headroom);
292 skb_reset_mac_header(skb);
293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
298 if (!netif_running(sdata->dev))
299 continue;
301 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
302 continue;
304 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
305 continue;
307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
311 netif_rx(skb2);
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
320 if (prev_dev) {
321 skb->dev = prev_dev;
322 netif_rx(skb);
323 } else
324 dev_kfree_skb(skb);
326 return origskb;
330 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
333 int tid;
335 /* does the frame have a qos control field? */
336 if (ieee80211_is_data_qos(hdr->frame_control)) {
337 u8 *qc = ieee80211_get_qos_ctl(hdr);
338 /* frame has qos control */
339 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
340 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
341 rx->flags |= IEEE80211_RX_AMSDU;
342 else
343 rx->flags &= ~IEEE80211_RX_AMSDU;
344 } else {
346 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 * Sequence numbers for management frames, QoS data
349 * frames with a broadcast/multicast address in the
350 * Address 1 field, and all non-QoS data frames sent
351 * by QoS STAs are assigned using an additional single
352 * modulo-4096 counter, [...]
354 * We also use that counter for non-QoS STAs.
356 tid = NUM_RX_DATA_QUEUES - 1;
359 rx->queue = tid;
360 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
361 * For now, set skb->priority to 0 for other cases. */
362 rx->skb->priority = (tid > 7) ? 0 : tid;
366 * DOC: Packet alignment
368 * Drivers always need to pass packets that are aligned to two-byte boundaries
369 * to the stack.
371 * Additionally, should, if possible, align the payload data in a way that
372 * guarantees that the contained IP header is aligned to a four-byte
373 * boundary. In the case of regular frames, this simply means aligning the
374 * payload to a four-byte boundary (because either the IP header is directly
375 * contained, or IV/RFC1042 headers that have a length divisible by four are
376 * in front of it).
378 * With A-MSDU frames, however, the payload data address must yield two modulo
379 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
380 * push the IP header further back to a multiple of four again. Thankfully, the
381 * specs were sane enough this time around to require padding each A-MSDU
382 * subframe to a length that is a multiple of four.
384 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
385 * the payload is not supported, the driver is required to move the 802.11
386 * header to be directly in front of the payload in that case.
388 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
390 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
391 int hdrlen;
393 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
394 return;
395 #endif
397 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
398 "unaligned packet at 0x%p\n", rx->skb->data))
399 return;
401 if (!ieee80211_is_data_present(hdr->frame_control))
402 return;
404 hdrlen = ieee80211_hdrlen(hdr->frame_control);
405 if (rx->flags & IEEE80211_RX_AMSDU)
406 hdrlen += ETH_HLEN;
407 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
408 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
412 /* rx handlers */
414 static ieee80211_rx_result debug_noinline
415 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
417 struct ieee80211_local *local = rx->local;
418 struct sk_buff *skb = rx->skb;
420 if (unlikely(local->hw_scanning))
421 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
423 if (unlikely(local->sw_scanning)) {
424 /* drop all the other packets during a software scan anyway */
425 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
426 != RX_QUEUED)
427 dev_kfree_skb(skb);
428 return RX_QUEUED;
431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
437 return RX_CONTINUE;
441 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return 0;
448 return ieee80211_is_robust_mgmt_frame(hdr);
452 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return 0;
459 return ieee80211_is_robust_mgmt_frame(hdr);
463 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
471 return -1;
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
480 return -1;
482 return le16_to_cpu(mmie->key_id);
486 static ieee80211_rx_result
487 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
504 struct ieee80211_mgmt *mgmt;
506 if (!ieee80211_is_mgmt(hdr->frame_control))
507 return RX_DROP_MONITOR;
509 if (ieee80211_is_action(hdr->frame_control)) {
510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
513 return RX_CONTINUE;
516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
519 return RX_CONTINUE;
521 return RX_DROP_MONITOR;
525 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
530 return RX_DROP_MONITOR;
531 #undef msh_h_get
533 return RX_CONTINUE;
537 static ieee80211_rx_result debug_noinline
538 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
545 rx->sta->last_seq_ctrl[rx->queue] ==
546 hdr->seq_ctrl)) {
547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
551 return RX_DROP_MONITOR;
552 } else
553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
558 return RX_DROP_MONITOR;
561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
571 return ieee80211_rx_mesh_check(rx);
573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
581 /* Drop IBSS frames and frames for other hosts
582 * silently. */
583 return RX_DROP_MONITOR;
586 return RX_DROP_MONITOR;
589 return RX_CONTINUE;
593 static ieee80211_rx_result debug_noinline
594 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597 int keyidx;
598 int hdrlen;
599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
600 struct ieee80211_key *stakey = NULL;
601 int mmie_keyidx = -1;
604 * Key selection 101
606 * There are four types of keys:
607 * - GTK (group keys)
608 * - IGTK (group keys for management frames)
609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
627 * possible.
630 if (!ieee80211_has_protected(hdr->frame_control)) {
631 if (!ieee80211_is_mgmt(hdr->frame_control) ||
632 rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP))
633 return RX_CONTINUE;
634 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
635 if (mmie_keyidx < 0)
636 return RX_CONTINUE;
640 * No point in finding a key and decrypting if the frame is neither
641 * addressed to us nor a multicast frame.
643 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
644 return RX_CONTINUE;
646 if (rx->sta)
647 stakey = rcu_dereference(rx->sta->key);
649 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
650 rx->key = stakey;
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))
655 return RX_CONTINUE;
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 {
663 * The device doesn't give us the IV so we won't be
664 * able to look up the key. That's ok though, we
665 * don't need to decrypt the frame, we just won't
666 * be able to keep statistics accurate.
667 * Except for key threshold notifications, should
668 * we somehow allow the driver to tell us which key
669 * the hardware used if this flag is set?
671 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
672 (rx->status->flag & RX_FLAG_IV_STRIPPED))
673 return RX_CONTINUE;
675 hdrlen = ieee80211_hdrlen(hdr->frame_control);
677 if (rx->skb->len < 8 + hdrlen)
678 return RX_DROP_UNUSABLE; /* TODO: count this? */
681 * no need to call ieee80211_wep_get_keyidx,
682 * it verifies a bunch of things we've done already
684 keyidx = rx->skb->data[hdrlen + 3] >> 6;
686 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
689 * RSNA-protected unicast frames should always be sent with
690 * pairwise or station-to-station keys, but for WEP we allow
691 * using a key index as well.
693 if (rx->key && rx->key->conf.alg != ALG_WEP &&
694 !is_multicast_ether_addr(hdr->addr1))
695 rx->key = NULL;
698 if (rx->key) {
699 rx->key->tx_rx_count++;
700 /* TODO: add threshold stuff again */
701 } else {
702 return RX_DROP_MONITOR;
705 /* Check for weak IVs if possible */
706 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
707 ieee80211_is_data(hdr->frame_control) &&
708 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
709 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
710 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
711 rx->sta->wep_weak_iv_count++;
713 switch (rx->key->conf.alg) {
714 case ALG_WEP:
715 result = ieee80211_crypto_wep_decrypt(rx);
716 break;
717 case ALG_TKIP:
718 result = ieee80211_crypto_tkip_decrypt(rx);
719 break;
720 case ALG_CCMP:
721 result = ieee80211_crypto_ccmp_decrypt(rx);
722 break;
723 case ALG_AES_CMAC:
724 result = ieee80211_crypto_aes_cmac_decrypt(rx);
725 break;
728 /* either the frame has been decrypted or will be dropped */
729 rx->status->flag |= RX_FLAG_DECRYPTED;
731 return result;
734 static ieee80211_rx_result debug_noinline
735 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
737 struct ieee80211_local *local;
738 struct ieee80211_hdr *hdr;
739 struct sk_buff *skb;
741 local = rx->local;
742 skb = rx->skb;
743 hdr = (struct ieee80211_hdr *) skb->data;
745 if (!local->pspolling)
746 return RX_CONTINUE;
748 if (!ieee80211_has_fromds(hdr->frame_control))
749 /* this is not from AP */
750 return RX_CONTINUE;
752 if (!ieee80211_is_data(hdr->frame_control))
753 return RX_CONTINUE;
755 if (!ieee80211_has_moredata(hdr->frame_control)) {
756 /* AP has no more frames buffered for us */
757 local->pspolling = false;
758 return RX_CONTINUE;
761 /* more data bit is set, let's request a new frame from the AP */
762 ieee80211_send_pspoll(local, rx->sdata);
764 return RX_CONTINUE;
767 static void ap_sta_ps_start(struct sta_info *sta)
769 struct ieee80211_sub_if_data *sdata = sta->sdata;
770 struct ieee80211_local *local = sdata->local;
772 atomic_inc(&sdata->bss->num_sta_ps);
773 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
774 if (local->ops->sta_notify)
775 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
776 STA_NOTIFY_SLEEP, &sta->sta);
777 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
778 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
779 sdata->dev->name, sta->sta.addr, sta->sta.aid);
780 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
783 static int ap_sta_ps_end(struct sta_info *sta)
785 struct ieee80211_sub_if_data *sdata = sta->sdata;
786 struct ieee80211_local *local = sdata->local;
787 struct sk_buff *skb;
788 int sent = 0;
790 atomic_dec(&sdata->bss->num_sta_ps);
792 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
793 if (local->ops->sta_notify)
794 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
795 STA_NOTIFY_AWAKE, &sta->sta);
797 if (!skb_queue_empty(&sta->ps_tx_buf))
798 sta_info_clear_tim_bit(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 /* Send all buffered frames to the station */
806 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
807 sent++;
808 skb->requeue = 1;
809 dev_queue_xmit(skb);
811 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
812 local->total_ps_buffered--;
813 sent++;
814 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
815 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
816 "since STA not sleeping anymore\n", sdata->dev->name,
817 sta->sta.addr, sta->sta.aid);
818 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
819 skb->requeue = 1;
820 dev_queue_xmit(skb);
823 return sent;
826 static ieee80211_rx_result debug_noinline
827 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
829 struct sta_info *sta = rx->sta;
830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
832 if (!sta)
833 return RX_CONTINUE;
835 /* Update last_rx only for IBSS packets which are for the current
836 * BSSID to avoid keeping the current IBSS network alive in cases where
837 * other STAs are using different BSSID. */
838 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
839 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
840 NL80211_IFTYPE_ADHOC);
841 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
842 sta->last_rx = jiffies;
843 } else
844 if (!is_multicast_ether_addr(hdr->addr1) ||
845 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
846 /* Update last_rx only for unicast frames in order to prevent
847 * the Probe Request frames (the only broadcast frames from a
848 * STA in infrastructure mode) from keeping a connection alive.
849 * Mesh beacons will update last_rx when if they are found to
850 * match the current local configuration when processed.
852 sta->last_rx = jiffies;
855 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
856 return RX_CONTINUE;
858 sta->rx_fragments++;
859 sta->rx_bytes += rx->skb->len;
860 sta->last_signal = rx->status->signal;
861 sta->last_qual = rx->status->qual;
862 sta->last_noise = rx->status->noise;
865 * Change STA power saving mode only at the end of a frame
866 * exchange sequence.
868 if (!ieee80211_has_morefrags(hdr->frame_control) &&
869 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
870 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
871 if (test_sta_flags(sta, WLAN_STA_PS)) {
873 * Ignore doze->wake transitions that are
874 * indicated by non-data frames, the standard
875 * is unclear here, but for example going to
876 * PS mode and then scanning would cause a
877 * doze->wake transition for the probe request,
878 * and that is clearly undesirable.
880 if (ieee80211_is_data(hdr->frame_control) &&
881 !ieee80211_has_pm(hdr->frame_control))
882 rx->sent_ps_buffered += ap_sta_ps_end(sta);
883 } else {
884 if (ieee80211_has_pm(hdr->frame_control))
885 ap_sta_ps_start(sta);
889 /* Drop data::nullfunc frames silently, since they are used only to
890 * control station power saving mode. */
891 if (ieee80211_is_nullfunc(hdr->frame_control)) {
892 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
893 /* Update counter and free packet here to avoid counting this
894 * as a dropped packed. */
895 sta->rx_packets++;
896 dev_kfree_skb(rx->skb);
897 return RX_QUEUED;
900 return RX_CONTINUE;
901 } /* ieee80211_rx_h_sta_process */
903 static inline struct ieee80211_fragment_entry *
904 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
905 unsigned int frag, unsigned int seq, int rx_queue,
906 struct sk_buff **skb)
908 struct ieee80211_fragment_entry *entry;
909 int idx;
911 idx = sdata->fragment_next;
912 entry = &sdata->fragments[sdata->fragment_next++];
913 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
914 sdata->fragment_next = 0;
916 if (!skb_queue_empty(&entry->skb_list)) {
917 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
918 struct ieee80211_hdr *hdr =
919 (struct ieee80211_hdr *) entry->skb_list.next->data;
920 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
921 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
922 "addr1=%pM addr2=%pM\n",
923 sdata->dev->name, idx,
924 jiffies - entry->first_frag_time, entry->seq,
925 entry->last_frag, hdr->addr1, hdr->addr2);
926 #endif
927 __skb_queue_purge(&entry->skb_list);
930 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
931 *skb = NULL;
932 entry->first_frag_time = jiffies;
933 entry->seq = seq;
934 entry->rx_queue = rx_queue;
935 entry->last_frag = frag;
936 entry->ccmp = 0;
937 entry->extra_len = 0;
939 return entry;
942 static inline struct ieee80211_fragment_entry *
943 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
944 unsigned int frag, unsigned int seq,
945 int rx_queue, struct ieee80211_hdr *hdr)
947 struct ieee80211_fragment_entry *entry;
948 int i, idx;
950 idx = sdata->fragment_next;
951 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
952 struct ieee80211_hdr *f_hdr;
954 idx--;
955 if (idx < 0)
956 idx = IEEE80211_FRAGMENT_MAX - 1;
958 entry = &sdata->fragments[idx];
959 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
960 entry->rx_queue != rx_queue ||
961 entry->last_frag + 1 != frag)
962 continue;
964 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
967 * Check ftype and addresses are equal, else check next fragment
969 if (((hdr->frame_control ^ f_hdr->frame_control) &
970 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
971 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
972 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
973 continue;
975 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
976 __skb_queue_purge(&entry->skb_list);
977 continue;
979 return entry;
982 return NULL;
985 static ieee80211_rx_result debug_noinline
986 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
988 struct ieee80211_hdr *hdr;
989 u16 sc;
990 __le16 fc;
991 unsigned int frag, seq;
992 struct ieee80211_fragment_entry *entry;
993 struct sk_buff *skb;
995 hdr = (struct ieee80211_hdr *)rx->skb->data;
996 fc = hdr->frame_control;
997 sc = le16_to_cpu(hdr->seq_ctrl);
998 frag = sc & IEEE80211_SCTL_FRAG;
1000 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1001 (rx->skb)->len < 24 ||
1002 is_multicast_ether_addr(hdr->addr1))) {
1003 /* not fragmented */
1004 goto out;
1006 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1008 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1010 if (frag == 0) {
1011 /* This is the first fragment of a new frame. */
1012 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1013 rx->queue, &(rx->skb));
1014 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1015 ieee80211_has_protected(fc)) {
1016 /* Store CCMP PN so that we can verify that the next
1017 * fragment has a sequential PN value. */
1018 entry->ccmp = 1;
1019 memcpy(entry->last_pn,
1020 rx->key->u.ccmp.rx_pn[rx->queue],
1021 CCMP_PN_LEN);
1023 return RX_QUEUED;
1026 /* This is a fragment for a frame that should already be pending in
1027 * fragment cache. Add this fragment to the end of the pending entry.
1029 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1030 if (!entry) {
1031 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1032 return RX_DROP_MONITOR;
1035 /* Verify that MPDUs within one MSDU have sequential PN values.
1036 * (IEEE 802.11i, 8.3.3.4.5) */
1037 if (entry->ccmp) {
1038 int i;
1039 u8 pn[CCMP_PN_LEN], *rpn;
1040 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1041 return RX_DROP_UNUSABLE;
1042 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1043 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1044 pn[i]++;
1045 if (pn[i])
1046 break;
1048 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1049 if (memcmp(pn, rpn, CCMP_PN_LEN))
1050 return RX_DROP_UNUSABLE;
1051 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1055 __skb_queue_tail(&entry->skb_list, rx->skb);
1056 entry->last_frag = frag;
1057 entry->extra_len += rx->skb->len;
1058 if (ieee80211_has_morefrags(fc)) {
1059 rx->skb = NULL;
1060 return RX_QUEUED;
1063 rx->skb = __skb_dequeue(&entry->skb_list);
1064 if (skb_tailroom(rx->skb) < entry->extra_len) {
1065 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1066 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1067 GFP_ATOMIC))) {
1068 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1069 __skb_queue_purge(&entry->skb_list);
1070 return RX_DROP_UNUSABLE;
1073 while ((skb = __skb_dequeue(&entry->skb_list))) {
1074 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1075 dev_kfree_skb(skb);
1078 /* Complete frame has been reassembled - process it now */
1079 rx->flags |= IEEE80211_RX_FRAGMENTED;
1081 out:
1082 if (rx->sta)
1083 rx->sta->rx_packets++;
1084 if (is_multicast_ether_addr(hdr->addr1))
1085 rx->local->dot11MulticastReceivedFrameCount++;
1086 else
1087 ieee80211_led_rx(rx->local);
1088 return RX_CONTINUE;
1091 static ieee80211_rx_result debug_noinline
1092 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1095 struct sk_buff *skb;
1096 int no_pending_pkts;
1097 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1099 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1100 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1101 return RX_CONTINUE;
1103 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1104 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1105 return RX_DROP_UNUSABLE;
1107 skb = skb_dequeue(&rx->sta->tx_filtered);
1108 if (!skb) {
1109 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1110 if (skb)
1111 rx->local->total_ps_buffered--;
1113 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1114 skb_queue_empty(&rx->sta->ps_tx_buf);
1116 if (skb) {
1117 struct ieee80211_hdr *hdr =
1118 (struct ieee80211_hdr *) skb->data;
1121 * Tell TX path to send one frame even though the STA may
1122 * still remain is PS mode after this frame exchange.
1124 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1126 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1127 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1128 rx->sta->sta.addr, rx->sta->sta.aid,
1129 skb_queue_len(&rx->sta->ps_tx_buf));
1130 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132 /* Use MoreData flag to indicate whether there are more
1133 * buffered frames for this STA */
1134 if (no_pending_pkts)
1135 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1136 else
1137 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1139 dev_queue_xmit(skb);
1141 if (no_pending_pkts)
1142 sta_info_clear_tim_bit(rx->sta);
1143 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1144 } else if (!rx->sent_ps_buffered) {
1146 * FIXME: This can be the result of a race condition between
1147 * us expiring a frame and the station polling for it.
1148 * Should we send it a null-func frame indicating we
1149 * have nothing buffered for it?
1151 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1152 "though there are no buffered frames for it\n",
1153 rx->dev->name, rx->sta->sta.addr);
1154 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1157 /* Free PS Poll skb here instead of returning RX_DROP that would
1158 * count as an dropped frame. */
1159 dev_kfree_skb(rx->skb);
1161 return RX_QUEUED;
1164 static ieee80211_rx_result debug_noinline
1165 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1167 u8 *data = rx->skb->data;
1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1170 if (!ieee80211_is_data_qos(hdr->frame_control))
1171 return RX_CONTINUE;
1173 /* remove the qos control field, update frame type and meta-data */
1174 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1175 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1176 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1177 /* change frame type to non QOS */
1178 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1180 return RX_CONTINUE;
1183 static int
1184 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1186 if (unlikely(!rx->sta ||
1187 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1188 return -EACCES;
1190 return 0;
1193 static int
1194 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1197 * Pass through unencrypted frames if the hardware has
1198 * decrypted them already.
1200 if (rx->status->flag & RX_FLAG_DECRYPTED)
1201 return 0;
1203 /* Drop unencrypted frames if key is set. */
1204 if (unlikely(!ieee80211_has_protected(fc) &&
1205 !ieee80211_is_nullfunc(fc) &&
1206 (!ieee80211_is_mgmt(fc) ||
1207 (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1208 rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) &&
1209 (rx->key || rx->sdata->drop_unencrypted)))
1210 return -EACCES;
1211 /* BIP does not use Protected field, so need to check MMIE */
1212 if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) &&
1213 ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1214 ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1215 (rx->key || rx->sdata->drop_unencrypted)))
1216 return -EACCES;
1218 return 0;
1221 static int
1222 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1224 struct net_device *dev = rx->dev;
1225 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1226 u16 hdrlen, ethertype;
1227 u8 *payload;
1228 u8 dst[ETH_ALEN];
1229 u8 src[ETH_ALEN] __aligned(2);
1230 struct sk_buff *skb = rx->skb;
1231 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1233 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1234 return -1;
1236 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1238 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1239 * header
1240 * IEEE 802.11 address fields:
1241 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1242 * 0 0 DA SA BSSID n/a
1243 * 0 1 DA BSSID SA n/a
1244 * 1 0 BSSID SA DA n/a
1245 * 1 1 RA TA DA SA
1247 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1248 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1250 switch (hdr->frame_control &
1251 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1252 case cpu_to_le16(IEEE80211_FCTL_TODS):
1253 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1254 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1255 return -1;
1256 break;
1257 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1258 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1259 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1260 return -1;
1261 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1262 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1263 (skb->data + hdrlen);
1264 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1265 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1266 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1267 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1270 break;
1271 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
1272 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1273 (is_multicast_ether_addr(dst) &&
1274 !compare_ether_addr(src, dev->dev_addr)))
1275 return -1;
1276 break;
1277 case cpu_to_le16(0):
1278 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1279 return -1;
1280 break;
1283 if (unlikely(skb->len - hdrlen < 8))
1284 return -1;
1286 payload = skb->data + hdrlen;
1287 ethertype = (payload[6] << 8) | payload[7];
1289 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1290 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1291 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1292 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1293 * replace EtherType */
1294 skb_pull(skb, hdrlen + 6);
1295 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1296 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1297 } else {
1298 struct ethhdr *ehdr;
1299 __be16 len;
1301 skb_pull(skb, hdrlen);
1302 len = htons(skb->len);
1303 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1304 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1305 memcpy(ehdr->h_source, src, ETH_ALEN);
1306 ehdr->h_proto = len;
1308 return 0;
1312 * requires that rx->skb is a frame with ethernet header
1314 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1316 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1317 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1318 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1321 * Allow EAPOL frames to us/the PAE group address regardless
1322 * of whether the frame was encrypted or not.
1324 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1325 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1326 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1327 return true;
1329 if (ieee80211_802_1x_port_control(rx) ||
1330 ieee80211_drop_unencrypted(rx, fc))
1331 return false;
1333 return true;
1337 * requires that rx->skb is a frame with ethernet header
1339 static void
1340 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1342 struct net_device *dev = rx->dev;
1343 struct ieee80211_local *local = rx->local;
1344 struct sk_buff *skb, *xmit_skb;
1345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1346 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1347 struct sta_info *dsta;
1349 skb = rx->skb;
1350 xmit_skb = NULL;
1352 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1353 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1354 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1355 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1356 if (is_multicast_ether_addr(ehdr->h_dest)) {
1358 * send multicast frames both to higher layers in
1359 * local net stack and back to the wireless medium
1361 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1362 if (!xmit_skb && net_ratelimit())
1363 printk(KERN_DEBUG "%s: failed to clone "
1364 "multicast frame\n", dev->name);
1365 } else {
1366 dsta = sta_info_get(local, skb->data);
1367 if (dsta && dsta->sdata->dev == dev) {
1369 * The destination station is associated to
1370 * this AP (in this VLAN), so send the frame
1371 * directly to it and do not pass it to local
1372 * net stack.
1374 xmit_skb = skb;
1375 skb = NULL;
1380 if (skb) {
1381 int align __maybe_unused;
1383 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1385 * 'align' will only take the values 0 or 2 here
1386 * since all frames are required to be aligned
1387 * to 2-byte boundaries when being passed to
1388 * mac80211. That also explains the __skb_push()
1389 * below.
1391 align = (unsigned long)skb->data & 4;
1392 if (align) {
1393 if (WARN_ON(skb_headroom(skb) < 3)) {
1394 dev_kfree_skb(skb);
1395 skb = NULL;
1396 } else {
1397 u8 *data = skb->data;
1398 size_t len = skb->len;
1399 u8 *new = __skb_push(skb, align);
1400 memmove(new, data, len);
1401 __skb_trim(skb, len);
1404 #endif
1406 if (skb) {
1407 /* deliver to local stack */
1408 skb->protocol = eth_type_trans(skb, dev);
1409 memset(skb->cb, 0, sizeof(skb->cb));
1410 netif_rx(skb);
1414 if (xmit_skb) {
1415 /* send to wireless media */
1416 xmit_skb->protocol = htons(ETH_P_802_3);
1417 skb_reset_network_header(xmit_skb);
1418 skb_reset_mac_header(xmit_skb);
1419 dev_queue_xmit(xmit_skb);
1423 static ieee80211_rx_result debug_noinline
1424 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1426 struct net_device *dev = rx->dev;
1427 struct ieee80211_local *local = rx->local;
1428 u16 ethertype;
1429 u8 *payload;
1430 struct sk_buff *skb = rx->skb, *frame = NULL;
1431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1432 __le16 fc = hdr->frame_control;
1433 const struct ethhdr *eth;
1434 int remaining, err;
1435 u8 dst[ETH_ALEN];
1436 u8 src[ETH_ALEN];
1438 if (unlikely(!ieee80211_is_data(fc)))
1439 return RX_CONTINUE;
1441 if (unlikely(!ieee80211_is_data_present(fc)))
1442 return RX_DROP_MONITOR;
1444 if (!(rx->flags & IEEE80211_RX_AMSDU))
1445 return RX_CONTINUE;
1447 err = ieee80211_data_to_8023(rx);
1448 if (unlikely(err))
1449 return RX_DROP_UNUSABLE;
1451 skb->dev = dev;
1453 dev->stats.rx_packets++;
1454 dev->stats.rx_bytes += skb->len;
1456 /* skip the wrapping header */
1457 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1458 if (!eth)
1459 return RX_DROP_UNUSABLE;
1461 while (skb != frame) {
1462 u8 padding;
1463 __be16 len = eth->h_proto;
1464 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1466 remaining = skb->len;
1467 memcpy(dst, eth->h_dest, ETH_ALEN);
1468 memcpy(src, eth->h_source, ETH_ALEN);
1470 padding = ((4 - subframe_len) & 0x3);
1471 /* the last MSDU has no padding */
1472 if (subframe_len > remaining)
1473 return RX_DROP_UNUSABLE;
1475 skb_pull(skb, sizeof(struct ethhdr));
1476 /* if last subframe reuse skb */
1477 if (remaining <= subframe_len + padding)
1478 frame = skb;
1479 else {
1481 * Allocate and reserve two bytes more for payload
1482 * alignment since sizeof(struct ethhdr) is 14.
1484 frame = dev_alloc_skb(
1485 ALIGN(local->hw.extra_tx_headroom, 4) +
1486 subframe_len + 2);
1488 if (frame == NULL)
1489 return RX_DROP_UNUSABLE;
1491 skb_reserve(frame,
1492 ALIGN(local->hw.extra_tx_headroom, 4) +
1493 sizeof(struct ethhdr) + 2);
1494 memcpy(skb_put(frame, ntohs(len)), skb->data,
1495 ntohs(len));
1497 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1498 padding);
1499 if (!eth) {
1500 dev_kfree_skb(frame);
1501 return RX_DROP_UNUSABLE;
1505 skb_reset_network_header(frame);
1506 frame->dev = dev;
1507 frame->priority = skb->priority;
1508 rx->skb = frame;
1510 payload = frame->data;
1511 ethertype = (payload[6] << 8) | payload[7];
1513 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1514 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1515 compare_ether_addr(payload,
1516 bridge_tunnel_header) == 0)) {
1517 /* remove RFC1042 or Bridge-Tunnel
1518 * encapsulation and replace EtherType */
1519 skb_pull(frame, 6);
1520 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1521 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1522 } else {
1523 memcpy(skb_push(frame, sizeof(__be16)),
1524 &len, sizeof(__be16));
1525 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1526 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1529 if (!ieee80211_frame_allowed(rx, fc)) {
1530 if (skb == frame) /* last frame */
1531 return RX_DROP_UNUSABLE;
1532 dev_kfree_skb(frame);
1533 continue;
1536 ieee80211_deliver_skb(rx);
1539 return RX_QUEUED;
1542 #ifdef CONFIG_MAC80211_MESH
1543 static ieee80211_rx_result
1544 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1546 struct ieee80211_hdr *hdr;
1547 struct ieee80211s_hdr *mesh_hdr;
1548 unsigned int hdrlen;
1549 struct sk_buff *skb = rx->skb, *fwd_skb;
1551 hdr = (struct ieee80211_hdr *) skb->data;
1552 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1553 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1555 if (!ieee80211_is_data(hdr->frame_control))
1556 return RX_CONTINUE;
1558 if (!mesh_hdr->ttl)
1559 /* illegal frame */
1560 return RX_DROP_MONITOR;
1562 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1563 struct ieee80211_sub_if_data *sdata;
1564 struct mesh_path *mppath;
1566 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1567 rcu_read_lock();
1568 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1569 if (!mppath) {
1570 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1571 } else {
1572 spin_lock_bh(&mppath->state_lock);
1573 mppath->exp_time = jiffies;
1574 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1575 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1576 spin_unlock_bh(&mppath->state_lock);
1578 rcu_read_unlock();
1581 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1582 return RX_CONTINUE;
1584 mesh_hdr->ttl--;
1586 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1587 if (!mesh_hdr->ttl)
1588 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1589 dropped_frames_ttl);
1590 else {
1591 struct ieee80211_hdr *fwd_hdr;
1592 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1594 if (!fwd_skb && net_ratelimit())
1595 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1596 rx->dev->name);
1598 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1600 * Save TA to addr1 to send TA a path error if a
1601 * suitable next hop is not found
1603 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1604 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1605 fwd_skb->dev = rx->local->mdev;
1606 fwd_skb->iif = rx->dev->ifindex;
1607 dev_queue_xmit(fwd_skb);
1611 if (is_multicast_ether_addr(hdr->addr3) ||
1612 rx->dev->flags & IFF_PROMISC)
1613 return RX_CONTINUE;
1614 else
1615 return RX_DROP_MONITOR;
1617 #endif
1619 static ieee80211_rx_result debug_noinline
1620 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1622 struct net_device *dev = rx->dev;
1623 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1624 __le16 fc = hdr->frame_control;
1625 int err;
1627 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1628 return RX_CONTINUE;
1630 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1631 return RX_DROP_MONITOR;
1633 err = ieee80211_data_to_8023(rx);
1634 if (unlikely(err))
1635 return RX_DROP_UNUSABLE;
1637 if (!ieee80211_frame_allowed(rx, fc))
1638 return RX_DROP_MONITOR;
1640 rx->skb->dev = dev;
1642 dev->stats.rx_packets++;
1643 dev->stats.rx_bytes += rx->skb->len;
1645 ieee80211_deliver_skb(rx);
1647 return RX_QUEUED;
1650 static ieee80211_rx_result debug_noinline
1651 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1653 struct ieee80211_local *local = rx->local;
1654 struct ieee80211_hw *hw = &local->hw;
1655 struct sk_buff *skb = rx->skb;
1656 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1657 struct tid_ampdu_rx *tid_agg_rx;
1658 u16 start_seq_num;
1659 u16 tid;
1661 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1662 return RX_CONTINUE;
1664 if (ieee80211_is_back_req(bar->frame_control)) {
1665 if (!rx->sta)
1666 return RX_CONTINUE;
1667 tid = le16_to_cpu(bar->control) >> 12;
1668 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1669 != HT_AGG_STATE_OPERATIONAL)
1670 return RX_CONTINUE;
1671 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1673 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1675 /* reset session timer */
1676 if (tid_agg_rx->timeout)
1677 mod_timer(&tid_agg_rx->session_timer,
1678 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1680 /* manage reordering buffer according to requested */
1681 /* sequence number */
1682 rcu_read_lock();
1683 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1684 start_seq_num, 1);
1685 rcu_read_unlock();
1686 return RX_DROP_UNUSABLE;
1689 return RX_CONTINUE;
1692 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1693 struct ieee80211_mgmt *mgmt,
1694 size_t len)
1696 struct ieee80211_local *local = sdata->local;
1697 struct sk_buff *skb;
1698 struct ieee80211_mgmt *resp;
1700 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1701 /* Not to own unicast address */
1702 return;
1705 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1706 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1707 /* Not from the current AP. */
1708 return;
1711 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
1712 /* Association in progress; ignore SA Query */
1713 return;
1716 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1717 /* Too short SA Query request frame */
1718 return;
1721 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1722 if (skb == NULL)
1723 return;
1725 skb_reserve(skb, local->hw.extra_tx_headroom);
1726 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1727 memset(resp, 0, 24);
1728 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1729 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1730 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1731 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1732 IEEE80211_STYPE_ACTION);
1733 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1734 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1735 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1736 memcpy(resp->u.action.u.sa_query.trans_id,
1737 mgmt->u.action.u.sa_query.trans_id,
1738 WLAN_SA_QUERY_TR_ID_LEN);
1740 ieee80211_tx_skb(sdata, skb, 1);
1743 static ieee80211_rx_result debug_noinline
1744 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1746 struct ieee80211_local *local = rx->local;
1747 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1748 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1749 struct ieee80211_bss *bss;
1750 int len = rx->skb->len;
1752 if (!ieee80211_is_action(mgmt->frame_control))
1753 return RX_CONTINUE;
1755 if (!rx->sta)
1756 return RX_DROP_MONITOR;
1758 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1759 return RX_DROP_MONITOR;
1761 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1762 return RX_DROP_MONITOR;
1764 /* all categories we currently handle have action_code */
1765 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1766 return RX_DROP_MONITOR;
1768 switch (mgmt->u.action.category) {
1769 case WLAN_CATEGORY_BACK:
1771 * The aggregation code is not prepared to handle
1772 * anything but STA/AP due to the BSSID handling;
1773 * IBSS could work in the code but isn't supported
1774 * by drivers or the standard.
1776 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1777 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1778 sdata->vif.type != NL80211_IFTYPE_AP)
1779 return RX_DROP_MONITOR;
1781 switch (mgmt->u.action.u.addba_req.action_code) {
1782 case WLAN_ACTION_ADDBA_REQ:
1783 if (len < (IEEE80211_MIN_ACTION_SIZE +
1784 sizeof(mgmt->u.action.u.addba_req)))
1785 return RX_DROP_MONITOR;
1786 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1787 break;
1788 case WLAN_ACTION_ADDBA_RESP:
1789 if (len < (IEEE80211_MIN_ACTION_SIZE +
1790 sizeof(mgmt->u.action.u.addba_resp)))
1791 return RX_DROP_MONITOR;
1792 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1793 break;
1794 case WLAN_ACTION_DELBA:
1795 if (len < (IEEE80211_MIN_ACTION_SIZE +
1796 sizeof(mgmt->u.action.u.delba)))
1797 return RX_DROP_MONITOR;
1798 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1799 break;
1801 break;
1802 case WLAN_CATEGORY_SPECTRUM_MGMT:
1803 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1804 return RX_DROP_MONITOR;
1806 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1807 return RX_DROP_MONITOR;
1809 switch (mgmt->u.action.u.measurement.action_code) {
1810 case WLAN_ACTION_SPCT_MSR_REQ:
1811 if (len < (IEEE80211_MIN_ACTION_SIZE +
1812 sizeof(mgmt->u.action.u.measurement)))
1813 return RX_DROP_MONITOR;
1814 ieee80211_process_measurement_req(sdata, mgmt, len);
1815 break;
1816 case WLAN_ACTION_SPCT_CHL_SWITCH:
1817 if (len < (IEEE80211_MIN_ACTION_SIZE +
1818 sizeof(mgmt->u.action.u.chan_switch)))
1819 return RX_DROP_MONITOR;
1821 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1822 return RX_DROP_MONITOR;
1824 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
1825 local->hw.conf.channel->center_freq,
1826 sdata->u.mgd.ssid,
1827 sdata->u.mgd.ssid_len);
1828 if (!bss)
1829 return RX_DROP_MONITOR;
1831 ieee80211_process_chanswitch(sdata,
1832 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1833 ieee80211_rx_bss_put(local, bss);
1834 break;
1836 break;
1837 case WLAN_CATEGORY_SA_QUERY:
1838 if (len < (IEEE80211_MIN_ACTION_SIZE +
1839 sizeof(mgmt->u.action.u.sa_query)))
1840 return RX_DROP_MONITOR;
1841 switch (mgmt->u.action.u.sa_query.action) {
1842 case WLAN_ACTION_SA_QUERY_REQUEST:
1843 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1844 return RX_DROP_MONITOR;
1845 ieee80211_process_sa_query_req(sdata, mgmt, len);
1846 break;
1847 case WLAN_ACTION_SA_QUERY_RESPONSE:
1849 * SA Query response is currently only used in AP mode
1850 * and it is processed in user space.
1852 return RX_CONTINUE;
1854 break;
1855 default:
1856 return RX_CONTINUE;
1859 rx->sta->rx_packets++;
1860 dev_kfree_skb(rx->skb);
1861 return RX_QUEUED;
1864 static ieee80211_rx_result debug_noinline
1865 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1867 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1868 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1870 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1871 return RX_DROP_MONITOR;
1873 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1874 return RX_DROP_MONITOR;
1876 if (ieee80211_vif_is_mesh(&sdata->vif))
1877 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1879 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1880 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1881 return RX_DROP_MONITOR;
1884 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1885 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1886 return RX_DROP_MONITOR;
1887 return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1890 return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
1893 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1894 struct ieee80211_hdr *hdr,
1895 struct ieee80211_rx_data *rx)
1897 int keyidx;
1898 unsigned int hdrlen;
1900 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1901 if (rx->skb->len >= hdrlen + 4)
1902 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1903 else
1904 keyidx = -1;
1906 if (!rx->sta) {
1908 * Some hardware seem to generate incorrect Michael MIC
1909 * reports; ignore them to avoid triggering countermeasures.
1911 goto ignore;
1914 if (!ieee80211_has_protected(hdr->frame_control))
1915 goto ignore;
1917 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1919 * APs with pairwise keys should never receive Michael MIC
1920 * errors for non-zero keyidx because these are reserved for
1921 * group keys and only the AP is sending real multicast
1922 * frames in the BSS.
1924 goto ignore;
1927 if (!ieee80211_is_data(hdr->frame_control) &&
1928 !ieee80211_is_auth(hdr->frame_control))
1929 goto ignore;
1931 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1932 ignore:
1933 dev_kfree_skb(rx->skb);
1934 rx->skb = NULL;
1937 /* TODO: use IEEE80211_RX_FRAGMENTED */
1938 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1940 struct ieee80211_sub_if_data *sdata;
1941 struct ieee80211_local *local = rx->local;
1942 struct ieee80211_rtap_hdr {
1943 struct ieee80211_radiotap_header hdr;
1944 u8 flags;
1945 u8 rate;
1946 __le16 chan_freq;
1947 __le16 chan_flags;
1948 } __attribute__ ((packed)) *rthdr;
1949 struct sk_buff *skb = rx->skb, *skb2;
1950 struct net_device *prev_dev = NULL;
1951 struct ieee80211_rx_status *status = rx->status;
1953 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1954 goto out_free_skb;
1956 if (skb_headroom(skb) < sizeof(*rthdr) &&
1957 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1958 goto out_free_skb;
1960 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1961 memset(rthdr, 0, sizeof(*rthdr));
1962 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1963 rthdr->hdr.it_present =
1964 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1965 (1 << IEEE80211_RADIOTAP_RATE) |
1966 (1 << IEEE80211_RADIOTAP_CHANNEL));
1968 rthdr->rate = rx->rate->bitrate / 5;
1969 rthdr->chan_freq = cpu_to_le16(status->freq);
1971 if (status->band == IEEE80211_BAND_5GHZ)
1972 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1973 IEEE80211_CHAN_5GHZ);
1974 else
1975 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1976 IEEE80211_CHAN_2GHZ);
1978 skb_set_mac_header(skb, 0);
1979 skb->ip_summed = CHECKSUM_UNNECESSARY;
1980 skb->pkt_type = PACKET_OTHERHOST;
1981 skb->protocol = htons(ETH_P_802_2);
1983 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1984 if (!netif_running(sdata->dev))
1985 continue;
1987 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1988 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1989 continue;
1991 if (prev_dev) {
1992 skb2 = skb_clone(skb, GFP_ATOMIC);
1993 if (skb2) {
1994 skb2->dev = prev_dev;
1995 netif_rx(skb2);
1999 prev_dev = sdata->dev;
2000 sdata->dev->stats.rx_packets++;
2001 sdata->dev->stats.rx_bytes += skb->len;
2004 if (prev_dev) {
2005 skb->dev = prev_dev;
2006 netif_rx(skb);
2007 skb = NULL;
2008 } else
2009 goto out_free_skb;
2011 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
2012 return;
2014 out_free_skb:
2015 dev_kfree_skb(skb);
2019 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2020 struct ieee80211_rx_data *rx,
2021 struct sk_buff *skb)
2023 ieee80211_rx_result res = RX_DROP_MONITOR;
2025 rx->skb = skb;
2026 rx->sdata = sdata;
2027 rx->dev = sdata->dev;
2029 #define CALL_RXH(rxh) \
2030 do { \
2031 res = rxh(rx); \
2032 if (res != RX_CONTINUE) \
2033 goto rxh_done; \
2034 } while (0);
2036 CALL_RXH(ieee80211_rx_h_passive_scan)
2037 CALL_RXH(ieee80211_rx_h_check)
2038 CALL_RXH(ieee80211_rx_h_decrypt)
2039 CALL_RXH(ieee80211_rx_h_check_more_data)
2040 CALL_RXH(ieee80211_rx_h_sta_process)
2041 CALL_RXH(ieee80211_rx_h_defragment)
2042 CALL_RXH(ieee80211_rx_h_ps_poll)
2043 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2044 /* must be after MMIC verify so header is counted in MPDU mic */
2045 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2046 CALL_RXH(ieee80211_rx_h_amsdu)
2047 #ifdef CONFIG_MAC80211_MESH
2048 if (ieee80211_vif_is_mesh(&sdata->vif))
2049 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2050 #endif
2051 CALL_RXH(ieee80211_rx_h_data)
2052 CALL_RXH(ieee80211_rx_h_ctrl)
2053 CALL_RXH(ieee80211_rx_h_action)
2054 CALL_RXH(ieee80211_rx_h_mgmt)
2056 #undef CALL_RXH
2058 rxh_done:
2059 switch (res) {
2060 case RX_DROP_MONITOR:
2061 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2062 if (rx->sta)
2063 rx->sta->rx_dropped++;
2064 /* fall through */
2065 case RX_CONTINUE:
2066 ieee80211_rx_cooked_monitor(rx);
2067 break;
2068 case RX_DROP_UNUSABLE:
2069 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2070 if (rx->sta)
2071 rx->sta->rx_dropped++;
2072 dev_kfree_skb(rx->skb);
2073 break;
2074 case RX_QUEUED:
2075 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2076 break;
2080 /* main receive path */
2082 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2083 struct ieee80211_rx_data *rx,
2084 struct ieee80211_hdr *hdr)
2086 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2087 int multicast = is_multicast_ether_addr(hdr->addr1);
2089 switch (sdata->vif.type) {
2090 case NL80211_IFTYPE_STATION:
2091 if (!bssid)
2092 return 0;
2093 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
2094 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2095 return 0;
2096 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2097 } else if (!multicast &&
2098 compare_ether_addr(sdata->dev->dev_addr,
2099 hdr->addr1) != 0) {
2100 if (!(sdata->dev->flags & IFF_PROMISC))
2101 return 0;
2102 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2104 break;
2105 case NL80211_IFTYPE_ADHOC:
2106 if (!bssid)
2107 return 0;
2108 if (ieee80211_is_beacon(hdr->frame_control)) {
2109 return 1;
2111 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2112 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2113 return 0;
2114 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2115 } else if (!multicast &&
2116 compare_ether_addr(sdata->dev->dev_addr,
2117 hdr->addr1) != 0) {
2118 if (!(sdata->dev->flags & IFF_PROMISC))
2119 return 0;
2120 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2121 } else if (!rx->sta) {
2122 int rate_idx;
2123 if (rx->status->flag & RX_FLAG_HT)
2124 rate_idx = 0; /* TODO: HT rates */
2125 else
2126 rate_idx = rx->status->rate_idx;
2127 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2128 BIT(rate_idx));
2130 break;
2131 case NL80211_IFTYPE_MESH_POINT:
2132 if (!multicast &&
2133 compare_ether_addr(sdata->dev->dev_addr,
2134 hdr->addr1) != 0) {
2135 if (!(sdata->dev->flags & IFF_PROMISC))
2136 return 0;
2138 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2140 break;
2141 case NL80211_IFTYPE_AP_VLAN:
2142 case NL80211_IFTYPE_AP:
2143 if (!bssid) {
2144 if (compare_ether_addr(sdata->dev->dev_addr,
2145 hdr->addr1))
2146 return 0;
2147 } else if (!ieee80211_bssid_match(bssid,
2148 sdata->dev->dev_addr)) {
2149 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2150 return 0;
2151 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2153 break;
2154 case NL80211_IFTYPE_WDS:
2155 if (bssid || !ieee80211_is_data(hdr->frame_control))
2156 return 0;
2157 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2158 return 0;
2159 break;
2160 case NL80211_IFTYPE_MONITOR:
2161 /* take everything */
2162 break;
2163 case NL80211_IFTYPE_UNSPECIFIED:
2164 case __NL80211_IFTYPE_AFTER_LAST:
2165 /* should never get here */
2166 WARN_ON(1);
2167 break;
2170 return 1;
2174 * This is the actual Rx frames handler. as it blongs to Rx path it must
2175 * be called with rcu_read_lock protection.
2177 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2178 struct sk_buff *skb,
2179 struct ieee80211_rx_status *status,
2180 struct ieee80211_rate *rate)
2182 struct ieee80211_local *local = hw_to_local(hw);
2183 struct ieee80211_sub_if_data *sdata;
2184 struct ieee80211_hdr *hdr;
2185 struct ieee80211_rx_data rx;
2186 int prepares;
2187 struct ieee80211_sub_if_data *prev = NULL;
2188 struct sk_buff *skb_new;
2190 hdr = (struct ieee80211_hdr *)skb->data;
2191 memset(&rx, 0, sizeof(rx));
2192 rx.skb = skb;
2193 rx.local = local;
2195 rx.status = status;
2196 rx.rate = rate;
2198 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2199 local->dot11ReceivedFragmentCount++;
2201 rx.sta = sta_info_get(local, hdr->addr2);
2202 if (rx.sta) {
2203 rx.sdata = rx.sta->sdata;
2204 rx.dev = rx.sta->sdata->dev;
2207 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2208 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
2209 return;
2212 if (unlikely(local->sw_scanning || local->hw_scanning))
2213 rx.flags |= IEEE80211_RX_IN_SCAN;
2215 ieee80211_parse_qos(&rx);
2216 ieee80211_verify_alignment(&rx);
2218 skb = rx.skb;
2220 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2221 if (!netif_running(sdata->dev))
2222 continue;
2224 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2225 continue;
2227 rx.flags |= IEEE80211_RX_RA_MATCH;
2228 prepares = prepare_for_handlers(sdata, &rx, hdr);
2230 if (!prepares)
2231 continue;
2234 * frame is destined for this interface, but if it's not
2235 * also for the previous one we handle that after the
2236 * loop to avoid copying the SKB once too much
2239 if (!prev) {
2240 prev = sdata;
2241 continue;
2245 * frame was destined for the previous interface
2246 * so invoke RX handlers for it
2249 skb_new = skb_copy(skb, GFP_ATOMIC);
2250 if (!skb_new) {
2251 if (net_ratelimit())
2252 printk(KERN_DEBUG "%s: failed to copy "
2253 "multicast frame for %s\n",
2254 wiphy_name(local->hw.wiphy),
2255 prev->dev->name);
2256 continue;
2258 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2259 prev = sdata;
2261 if (prev)
2262 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2263 else
2264 dev_kfree_skb(skb);
2267 #define SEQ_MODULO 0x1000
2268 #define SEQ_MASK 0xfff
2270 static inline int seq_less(u16 sq1, u16 sq2)
2272 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2275 static inline u16 seq_inc(u16 sq)
2277 return (sq + 1) & SEQ_MASK;
2280 static inline u16 seq_sub(u16 sq1, u16 sq2)
2282 return (sq1 - sq2) & SEQ_MASK;
2287 * As it function blongs to Rx path it must be called with
2288 * the proper rcu_read_lock protection for its flow.
2290 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2291 struct tid_ampdu_rx *tid_agg_rx,
2292 struct sk_buff *skb,
2293 u16 mpdu_seq_num,
2294 int bar_req)
2296 struct ieee80211_local *local = hw_to_local(hw);
2297 struct ieee80211_rx_status status;
2298 u16 head_seq_num, buf_size;
2299 int index;
2300 struct ieee80211_supported_band *sband;
2301 struct ieee80211_rate *rate;
2303 buf_size = tid_agg_rx->buf_size;
2304 head_seq_num = tid_agg_rx->head_seq_num;
2306 /* frame with out of date sequence number */
2307 if (seq_less(mpdu_seq_num, head_seq_num)) {
2308 dev_kfree_skb(skb);
2309 return 1;
2312 /* if frame sequence number exceeds our buffering window size or
2313 * block Ack Request arrived - release stored frames */
2314 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2315 /* new head to the ordering buffer */
2316 if (bar_req)
2317 head_seq_num = mpdu_seq_num;
2318 else
2319 head_seq_num =
2320 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2321 /* release stored frames up to new head to stack */
2322 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2323 index = seq_sub(tid_agg_rx->head_seq_num,
2324 tid_agg_rx->ssn)
2325 % tid_agg_rx->buf_size;
2327 if (tid_agg_rx->reorder_buf[index]) {
2328 /* release the reordered frames to stack */
2329 memcpy(&status,
2330 tid_agg_rx->reorder_buf[index]->cb,
2331 sizeof(status));
2332 sband = local->hw.wiphy->bands[status.band];
2333 if (status.flag & RX_FLAG_HT) {
2334 /* TODO: HT rates */
2335 rate = sband->bitrates;
2336 } else {
2337 rate = &sband->bitrates
2338 [status.rate_idx];
2340 __ieee80211_rx_handle_packet(hw,
2341 tid_agg_rx->reorder_buf[index],
2342 &status, rate);
2343 tid_agg_rx->stored_mpdu_num--;
2344 tid_agg_rx->reorder_buf[index] = NULL;
2346 tid_agg_rx->head_seq_num =
2347 seq_inc(tid_agg_rx->head_seq_num);
2349 if (bar_req)
2350 return 1;
2353 /* now the new frame is always in the range of the reordering */
2354 /* buffer window */
2355 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2356 % tid_agg_rx->buf_size;
2357 /* check if we already stored this frame */
2358 if (tid_agg_rx->reorder_buf[index]) {
2359 dev_kfree_skb(skb);
2360 return 1;
2363 /* if arrived mpdu is in the right order and nothing else stored */
2364 /* release it immediately */
2365 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2366 tid_agg_rx->stored_mpdu_num == 0) {
2367 tid_agg_rx->head_seq_num =
2368 seq_inc(tid_agg_rx->head_seq_num);
2369 return 0;
2372 /* put the frame in the reordering buffer */
2373 tid_agg_rx->reorder_buf[index] = skb;
2374 tid_agg_rx->stored_mpdu_num++;
2375 /* release the buffer until next missing frame */
2376 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2377 % tid_agg_rx->buf_size;
2378 while (tid_agg_rx->reorder_buf[index]) {
2379 /* release the reordered frame back to stack */
2380 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2381 sizeof(status));
2382 sband = local->hw.wiphy->bands[status.band];
2383 if (status.flag & RX_FLAG_HT)
2384 rate = sband->bitrates; /* TODO: HT rates */
2385 else
2386 rate = &sband->bitrates[status.rate_idx];
2387 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2388 &status, rate);
2389 tid_agg_rx->stored_mpdu_num--;
2390 tid_agg_rx->reorder_buf[index] = NULL;
2391 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2392 index = seq_sub(tid_agg_rx->head_seq_num,
2393 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2395 return 1;
2398 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2399 struct sk_buff *skb)
2401 struct ieee80211_hw *hw = &local->hw;
2402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2403 struct sta_info *sta;
2404 struct tid_ampdu_rx *tid_agg_rx;
2405 u16 sc;
2406 u16 mpdu_seq_num;
2407 u8 ret = 0;
2408 int tid;
2410 sta = sta_info_get(local, hdr->addr2);
2411 if (!sta)
2412 return ret;
2414 /* filter the QoS data rx stream according to
2415 * STA/TID and check if this STA/TID is on aggregation */
2416 if (!ieee80211_is_data_qos(hdr->frame_control))
2417 goto end_reorder;
2419 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2421 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2422 goto end_reorder;
2424 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2426 /* qos null data frames are excluded */
2427 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2428 goto end_reorder;
2430 /* new un-ordered ampdu frame - process it */
2432 /* reset session timer */
2433 if (tid_agg_rx->timeout)
2434 mod_timer(&tid_agg_rx->session_timer,
2435 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2437 /* if this mpdu is fragmented - terminate rx aggregation session */
2438 sc = le16_to_cpu(hdr->seq_ctrl);
2439 if (sc & IEEE80211_SCTL_FRAG) {
2440 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2441 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2442 ret = 1;
2443 goto end_reorder;
2446 /* according to mpdu sequence number deal with reordering buffer */
2447 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2448 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2449 mpdu_seq_num, 0);
2450 end_reorder:
2451 return ret;
2455 * This is the receive path handler. It is called by a low level driver when an
2456 * 802.11 MPDU is received from the hardware.
2458 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2459 struct ieee80211_rx_status *status)
2461 struct ieee80211_local *local = hw_to_local(hw);
2462 struct ieee80211_rate *rate = NULL;
2463 struct ieee80211_supported_band *sband;
2465 if (status->band < 0 ||
2466 status->band >= IEEE80211_NUM_BANDS) {
2467 WARN_ON(1);
2468 return;
2471 sband = local->hw.wiphy->bands[status->band];
2472 if (!sband) {
2473 WARN_ON(1);
2474 return;
2477 if (status->flag & RX_FLAG_HT) {
2478 /* rate_idx is MCS index */
2479 if (WARN_ON(status->rate_idx < 0 ||
2480 status->rate_idx >= 76))
2481 return;
2482 /* HT rates are not in the table - use the highest legacy rate
2483 * for now since other parts of mac80211 may not yet be fully
2484 * MCS aware. */
2485 rate = &sband->bitrates[sband->n_bitrates - 1];
2486 } else {
2487 if (WARN_ON(status->rate_idx < 0 ||
2488 status->rate_idx >= sband->n_bitrates))
2489 return;
2490 rate = &sband->bitrates[status->rate_idx];
2494 * key references and virtual interfaces are protected using RCU
2495 * and this requires that we are in a read-side RCU section during
2496 * receive processing
2498 rcu_read_lock();
2501 * Frames with failed FCS/PLCP checksum are not returned,
2502 * all other frames are returned without radiotap header
2503 * if it was previously present.
2504 * Also, frames with less than 16 bytes are dropped.
2506 skb = ieee80211_rx_monitor(local, skb, status, rate);
2507 if (!skb) {
2508 rcu_read_unlock();
2509 return;
2512 if (!ieee80211_rx_reorder_ampdu(local, skb))
2513 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2515 rcu_read_unlock();
2517 EXPORT_SYMBOL(__ieee80211_rx);
2519 /* This is a version of the rx handler that can be called from hard irq
2520 * context. Post the skb on the queue and schedule the tasklet */
2521 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2522 struct ieee80211_rx_status *status)
2524 struct ieee80211_local *local = hw_to_local(hw);
2526 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2528 skb->dev = local->mdev;
2529 /* copy status into skb->cb for use by tasklet */
2530 memcpy(skb->cb, status, sizeof(*status));
2531 skb->pkt_type = IEEE80211_RX_MSG;
2532 skb_queue_tail(&local->skb_queue, skb);
2533 tasklet_schedule(&local->tasklet);
2535 EXPORT_SYMBOL(ieee80211_rx_irqsafe);