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cfg80211: allow registering to beacons
[mirror_ubuntu-artful-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
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.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2 145 * MCS information is a separate field in radiotap,
73b48099
JB		 146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 148 */
149 *pos = 0;
8d6f658e 150 } else {
ebe6c7ba 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 152 *pos = rate->bitrate / 5;
8d6f658e 153 }
601ae7f2
BR		 154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 157 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
5f0b7de5
JB		 162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
9deb1ae5 165 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
601ae7f2 168 else
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
601ae7f2
BR		 171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
601ae7f2
BR		 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
601ae7f2
BR		 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 191 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 192 pos++;
aae89831 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
601ae7f2 196 pos += 2;
6d744bac
JB		 197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
601ae7f2
BR		 211}
212
b2e7771e
JB		 213/*
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.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 220 struct ieee80211_rate *rate)
b2e7771e 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 223 struct ieee80211_sub_if_data *sdata;
b2e7771e 224 int needed_headroom = 0;
b2e7771e
JB		 225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
b2e7771e
JB		 228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
0869aea0
JB		 237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
e3cf8b3f
ZY		 244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
b2e7771e 250 if (!local->monitors) {
0869aea0 251 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
0869aea0 256 return remove_monitor_info(local, origskb);
b2e7771e
JB		 257 }
258
0869aea0 259 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
0869aea0 283 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 284
285 if (!skb)
286 return origskb;
287 }
288
0869aea0
JB		 289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 291
ce3edf6d 292 skb_reset_mac_header(skb);
b2e7771e
JB		 293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
9607e6b6 304 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
5548a8a1 311 netif_receive_skb(skb2);
b2e7771e
JB		 312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
5548a8a1 322 netif_receive_skb(skb);
b2e7771e
JB		 323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
5cf121c3 330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 331{
238f74a2 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 334 int tid, seqno_idx, security_idx;
6e0d114d
JB		 335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 341 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 342 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 343
344 seqno_idx = tid;
345 security_idx = tid;
6e0d114d 346 } else {
1411f9b5
JB		 347 /*
348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 *
350 * Sequence numbers for management frames, QoS data
351 * frames with a broadcast/multicast address in the
352 * Address 1 field, and all non-QoS data frames sent
353 * by QoS STAs are assigned using an additional single
354 * modulo-4096 counter, [...]
355 *
356 * We also use that counter for non-QoS STAs.
357 */
9e26297a
JB		 358 seqno_idx = NUM_RX_DATA_QUEUES;
359 security_idx = 0;
360 if (ieee80211_is_mgmt(hdr->frame_control))
361 security_idx = NUM_RX_DATA_QUEUES;
362 tid = 0;
6e0d114d 363 }
52865dfd 364
9e26297a
JB		 365 rx->seqno_idx = seqno_idx;
366 rx->security_idx = security_idx;
6e0d114d
JB		 367 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368 * For now, set skb->priority to 0 for other cases. */
369 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 370}
6e0d114d 371
d1c3a37c
JB		 372/**
373 * DOC: Packet alignment
374 *
375 * Drivers always need to pass packets that are aligned to two-byte boundaries
376 * to the stack.
377 *
378 * Additionally, should, if possible, align the payload data in a way that
379 * guarantees that the contained IP header is aligned to a four-byte
380 * boundary. In the case of regular frames, this simply means aligning the
381 * payload to a four-byte boundary (because either the IP header is directly
382 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 383 * in front of it). If the payload data is not properly aligned and the
384 * architecture doesn't support efficient unaligned operations, mac80211
385 * will align the data.
d1c3a37c
JB		 386 *
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
392 *
25985edc 393 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
396 */
397static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 398{
59d9cb07
KV		 399#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400 WARN_ONCE((unsigned long)rx->skb->data & 1,
401 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 402#endif
6e0d114d
JB		 403}
404
6368e4b1 405
571ecf67
JB		 406/* rx handlers */
407
49461622 408static ieee80211_rx_result debug_noinline
5cf121c3 409ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 410{
411 struct ieee80211_local *local = rx->local;
554891e6 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 413 struct sk_buff *skb = rx->skb;
414
79f460ca
LC		 415 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
416 !local->sched_scanning))
4080c7cd
JB		 417 return RX_CONTINUE;
418
b23b025f 419 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 420 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
421 local->sched_scanning)
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
4080c7cd
JB		 424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426 return RX_DROP_UNUSABLE;
571ecf67
JB		 427}
428
3cfcf6ac
JM		 429
430static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431{
432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return 0;
436
437 return ieee80211_is_robust_mgmt_frame(hdr);
438}
439
440
441static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454{
455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456 struct ieee80211_mmie *mmie;
457
458 if (skb->len < 24 + sizeof(*mmie) ||
459 !is_multicast_ether_addr(hdr->da))
460 return -1;
461
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463 return -1; /* not a robust management frame */
464
465 mmie = (struct ieee80211_mmie *)
466 (skb->data + skb->len - sizeof(*mmie));
467 if (mmie->element_id != WLAN_EID_MMIE ||
468 mmie->length != sizeof(*mmie) - 2)
469 return -1;
470
471 return le16_to_cpu(mmie->key_id);
472}
473
474
33b64eb2 475static ieee80211_rx_result
5cf121c3 476ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 477{
a7767f95 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 479 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 480
a7767f95 481 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 482 if (is_multicast_ether_addr(hdr->addr1)) {
483 if (ieee80211_has_tods(hdr->frame_control) ||
484 !ieee80211_has_fromds(hdr->frame_control))
485 return RX_DROP_MONITOR;
486 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
487 return RX_DROP_MONITOR;
488 } else {
489 if (!ieee80211_has_a4(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
493 }
33b64eb2
LCC		 494 }
495
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
498 */
499
57cf8043 500 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 501 struct ieee80211_mgmt *mgmt;
d6d1a5a7 502
a7767f95 503 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 504 return RX_DROP_MONITOR;
505
a7767f95 506 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 507 u8 category;
33b64eb2 508 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 509 category = mgmt->u.action.category;
510 if (category != WLAN_CATEGORY_MESH_ACTION &&
511 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 512 return RX_DROP_MONITOR;
33b64eb2 513 return RX_CONTINUE;
33b64eb2
LCC		 514 }
515
a7767f95
HH		 516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 518 ieee80211_is_beacon(hdr->frame_control) ||
519 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 520 return RX_CONTINUE;
521
522 return RX_DROP_MONITOR;
523
524 }
525
902acc78
JB		 526 return RX_CONTINUE;
527}
33b64eb2 528
1edfb1af
JB		 529#define SEQ_MODULO 0x1000
530#define SEQ_MASK 0xfff
531
532static inline int seq_less(u16 sq1, u16 sq2)
533{
534 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
535}
536
537static inline u16 seq_inc(u16 sq)
538{
539 return (sq + 1) & SEQ_MASK;
540}
541
542static inline u16 seq_sub(u16 sq1, u16 sq2)
543{
544 return (sq1 - sq2) & SEQ_MASK;
545}
546
547
548static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
549 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 550 int index)
1edfb1af 551{
24a8fdad 552 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 553 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 554 struct ieee80211_rx_status *status;
1edfb1af 555
dd318575
JB		 556 lockdep_assert_held(&tid_agg_rx->reorder_lock);
557
1edfb1af
JB		 558 if (!skb)
559 goto no_frame;
560
071d9ac2 561 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 562 tid_agg_rx->stored_mpdu_num--;
563 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 564 status = IEEE80211_SKB_RXCB(skb);
565 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 566 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 567
568no_frame:
569 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
570}
571
572static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
573 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 574 u16 head_seq_num)
1edfb1af
JB		 575{
576 int index;
577
dd318575
JB		 578 lockdep_assert_held(&tid_agg_rx->reorder_lock);
579
1edfb1af
JB		 580 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
581 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
582 tid_agg_rx->buf_size;
24a8fdad 583 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 584 }
585}
586
587/*
588 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
589 * the skb was added to the buffer longer than this time ago, the earlier
590 * frames that have not yet been received are assumed to be lost and the skb
591 * can be released for processing. This may also release other skb's from the
592 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 593 *
594 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 595 */
596#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
597
aa0c8636 598static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 599 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 600{
2bff8ebf 601 int index, j;
aa0c8636 602
dd318575
JB		 603 lockdep_assert_held(&tid_agg_rx->reorder_lock);
604
aa0c8636
CL		 605 /* release the buffer until next missing frame */
606 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
607 tid_agg_rx->buf_size;
608 if (!tid_agg_rx->reorder_buf[index] &&
609 tid_agg_rx->stored_mpdu_num > 1) {
610 /*
611 * No buffers ready to be released, but check whether any
612 * frames in the reorder buffer have timed out.
613 */
aa0c8636
CL		 614 int skipped = 1;
615 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
616 j = (j + 1) % tid_agg_rx->buf_size) {
617 if (!tid_agg_rx->reorder_buf[j]) {
618 skipped++;
619 continue;
620 }
499fe9a4
DH		 621 if (skipped &&
622 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 623 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 624 goto set_release_timer;
aa0c8636
CL		 625
626#ifdef CONFIG_MAC80211_HT_DEBUG
627 if (net_ratelimit())
0fb9a9ec
JP		 628 wiphy_debug(hw->wiphy,
629 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 630#endif
24a8fdad 631 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 632
633 /*
634 * Increment the head seq# also for the skipped slots.
635 */
636 tid_agg_rx->head_seq_num =
637 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
638 skipped = 0;
639 }
640 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 641 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 642 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
643 tid_agg_rx->buf_size;
644 }
2bff8ebf
CL		 645
646 if (tid_agg_rx->stored_mpdu_num) {
647 j = index = seq_sub(tid_agg_rx->head_seq_num,
648 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
649
650 for (; j != (index - 1) % tid_agg_rx->buf_size;
651 j = (j + 1) % tid_agg_rx->buf_size) {
652 if (tid_agg_rx->reorder_buf[j])
653 break;
654 }
655
656 set_release_timer:
657
658 mod_timer(&tid_agg_rx->reorder_timer,
334df731 659 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 660 HT_RX_REORDER_BUF_TIMEOUT);
661 } else {
662 del_timer(&tid_agg_rx->reorder_timer);
663 }
aa0c8636
CL		 664}
665
1edfb1af
JB		 666/*
667 * As this function belongs to the RX path it must be under
668 * rcu_read_lock protection. It returns false if the frame
669 * can be processed immediately, true if it was consumed.
670 */
671static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
672 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 673 struct sk_buff *skb)
1edfb1af
JB		 674{
675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676 u16 sc = le16_to_cpu(hdr->seq_ctrl);
677 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
678 u16 head_seq_num, buf_size;
679 int index;
2bff8ebf 680 bool ret = true;
1edfb1af 681
dd318575
JB		 682 spin_lock(&tid_agg_rx->reorder_lock);
683
1edfb1af
JB		 684 buf_size = tid_agg_rx->buf_size;
685 head_seq_num = tid_agg_rx->head_seq_num;
686
687 /* frame with out of date sequence number */
688 if (seq_less(mpdu_seq_num, head_seq_num)) {
689 dev_kfree_skb(skb);
2bff8ebf 690 goto out;
1edfb1af
JB		 691 }
692
693 /*
694 * If frame the sequence number exceeds our buffering window
695 * size release some previous frames to make room for this one.
696 */
697 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
698 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
699 /* release stored frames up to new head to stack */
24a8fdad 700 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 701 }
702
703 /* Now the new frame is always in the range of the reordering buffer */
704
705 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
706
707 /* check if we already stored this frame */
708 if (tid_agg_rx->reorder_buf[index]) {
709 dev_kfree_skb(skb);
2bff8ebf 710 goto out;
1edfb1af
JB		 711 }
712
713 /*
714 * If the current MPDU is in the right order and nothing else
715 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 716 * If it is first but there's something stored, we may be able
717 * to release frames after this one.
1edfb1af
JB		 718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 722 ret = false;
723 goto out;
1edfb1af
JB		 724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
24a8fdad 730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 731
2bff8ebf
CL		 732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
1edfb1af
JB		 735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
24a8fdad 741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 742{
2569a826
JB		 743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 748 struct sta_info *sta = rx->sta;
1edfb1af
JB		 749 struct tid_ampdu_rx *tid_agg_rx;
750 u16 sc;
6cc00d54 751 u8 tid, ack_policy;
1edfb1af
JB		 752
753 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 754 goto dont_reorder;
1edfb1af
JB		 755
756 /*
757 * filter the QoS data rx stream according to
758 * STA/TID and check if this STA/TID is on aggregation
759 */
760
1edfb1af 761 if (!sta)
2569a826 762 goto dont_reorder;
1edfb1af 763
6cc00d54
TP		 764 ack_policy = *ieee80211_get_qos_ctl(hdr) &
765 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 766 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
767
a87f736d
JB		 768 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
769 if (!tid_agg_rx)
770 goto dont_reorder;
1edfb1af
JB		 771
772 /* qos null data frames are excluded */
773 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 774 goto dont_reorder;
1edfb1af 775
6cc00d54
TP		 776 /* not part of a BA session */
777 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
778 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
779 goto dont_reorder;
780
660c6a44
TP		 781 /* not actually part of this BA session */
782 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
783 goto dont_reorder;
784
1edfb1af
JB		 785 /* new, potentially un-ordered, ampdu frame - process it */
786
787 /* reset session timer */
788 if (tid_agg_rx->timeout)
789 mod_timer(&tid_agg_rx->session_timer,
790 TU_TO_EXP_TIME(tid_agg_rx->timeout));
791
792 /* if this mpdu is fragmented - terminate rx aggregation session */
793 sc = le16_to_cpu(hdr->seq_ctrl);
794 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 795 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 796 skb_queue_tail(&rx->sdata->skb_queue, skb);
797 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 798 return;
1edfb1af
JB		 799 }
800
a87f736d
JB		 801 /*
802 * No locking needed -- we will only ever process one
803 * RX packet at a time, and thus own tid_agg_rx. All
804 * other code manipulating it needs to (and does) make
805 * sure that we cannot get to it any more before doing
806 * anything with it.
807 */
24a8fdad 808 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 809 return;
810
811 dont_reorder:
24a8fdad 812 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 813}
33b64eb2 814
49461622 815static ieee80211_rx_result debug_noinline
5cf121c3 816ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 817{
a7767f95 818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 819 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 820
821 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
822 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 823 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 824 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 825 hdr->seq_ctrl)) {
554891e6 826 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 827 rx->local->dot11FrameDuplicateCount++;
828 rx->sta->num_duplicates++;
829 }
b1f93314 830 return RX_DROP_UNUSABLE;
571ecf67 831 } else
9e26297a 832 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 833 }
834
571ecf67
JB		 835 if (unlikely(rx->skb->len < 16)) {
836 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 837 return RX_DROP_MONITOR;
571ecf67
JB		 838 }
839
571ecf67
JB		 840 /* Drop disallowed frame classes based on STA auth/assoc state;
841 * IEEE 802.11, Chap 5.5.
842 *
ccd7b362
JB		 843 * mac80211 filters only based on association state, i.e. it drops
844 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 845 * deauth/disassoc frames when needed. In addition, hostapd is
846 * responsible for filtering on both auth and assoc states.
847 */
33b64eb2 848
902acc78 849 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 850 return ieee80211_rx_mesh_check(rx);
33b64eb2 851
a7767f95
HH		 852 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
853 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 854 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 855 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 856 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
2a33bee2
GE		 857 if (rx->sta && rx->sta->dummy &&
858 ieee80211_is_data_present(hdr->frame_control)) {
859 u16 ethertype;
860 u8 *payload;
861
862 payload = rx->skb->data +
863 ieee80211_hdrlen(hdr->frame_control);
864 ethertype = (payload[6] << 8) | payload[7];
865 if (cpu_to_be16(ethertype) ==
866 rx->sdata->control_port_protocol)
867 return RX_CONTINUE;
868 }
21fc7560
JB		 869
870 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
871 cfg80211_rx_spurious_frame(rx->sdata->dev,
872 hdr->addr2,
873 GFP_ATOMIC))
874 return RX_DROP_UNUSABLE;
875
e4c26add 876 return RX_DROP_MONITOR;
2a33bee2 877 }
571ecf67 878
9ae54c84 879 return RX_CONTINUE;
570bd537
JB		 880}
881
882
49461622 883static ieee80211_rx_result debug_noinline
5cf121c3 884ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 885{
eb9fb5b8
JB		 886 struct sk_buff *skb = rx->skb;
887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
888 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 889 int keyidx;
890 int hdrlen;
e4c26add 891 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 892 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 893 int mmie_keyidx = -1;
761ab470 894 __le16 fc;
570bd537 895
3017b80b
JB		 896 /*
897 * Key selection 101
898 *
3cfcf6ac 899 * There are four types of keys:
3017b80b 900 * - GTK (group keys)
3cfcf6ac 901 * - IGTK (group keys for management frames)
3017b80b
JB		 902 * - PTK (pairwise keys)
903 * - STK (station-to-station pairwise keys)
904 *
905 * When selecting a key, we have to distinguish between multicast
906 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 907 * use PTKs and STKs while the former always use GTKs and IGTKs.
908 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
909 * unicast frames can also use key indices like GTKs. Hence, if we
910 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 911 *
8dc06a1c
JB		 912 * Note that in a regular BSS, multicast frames are sent by the
913 * AP only, associated stations unicast the frame to the AP first
914 * which then multicasts it on their behalf.
915 *
3017b80b
JB		 916 * There is also a slight problem in IBSS mode: GTKs are negotiated
917 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 918 * The spec seems to expect that one negotiates the same key with
919 * every station but there's no such requirement; VLANs could be
920 * possible.
3017b80b
JB		 921 */
922
3017b80b 923 /*
1990af8d 924 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 925 * addressed to us nor a multicast frame.
926 */
554891e6 927 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 928 return RX_CONTINUE;
3017b80b 929
2569a826
JB		 930 /* start without a key */
931 rx->key = NULL;
932
d4e46a3d 933 if (rx->sta)
e31b8213 934 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 935
761ab470
JB		 936 fc = hdr->frame_control;
937
938 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 939 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
940
e31b8213
JB		 941 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
942 rx->key = sta_ptk;
dc1580dd
JB		 943 if ((status->flag & RX_FLAG_DECRYPTED) &&
944 (status->flag & RX_FLAG_IV_STRIPPED))
945 return RX_CONTINUE;
0c7c10c7 946 /* Skip decryption if the frame is not protected. */
761ab470 947 if (!ieee80211_has_protected(fc))
0c7c10c7 948 return RX_CONTINUE;
3cfcf6ac
JM		 949 } else if (mmie_keyidx >= 0) {
950 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 951 if ((status->flag & RX_FLAG_DECRYPTED) &&
952 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 953 return RX_CONTINUE;
954
955 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
956 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
957 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 958 if (rx->sta)
959 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
960 if (!rx->key)
961 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 962 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 963 /*
964 * The frame was not protected, so skip decryption. However, we
965 * need to set rx->key if there is a key that could have been
966 * used so that the frame may be dropped if encryption would
967 * have been expected.
968 */
969 struct ieee80211_key *key = NULL;
897bed8b
JB		 970 struct ieee80211_sub_if_data *sdata = rx->sdata;
971 int i;
972
761ab470 973 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 974 is_multicast_ether_addr(hdr->addr1) &&
975 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
976 rx->key = key;
897bed8b
JB		 977 else {
978 if (rx->sta) {
979 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
980 key = rcu_dereference(rx->sta->gtk[i]);
981 if (key)
982 break;
983 }
984 }
985 if (!key) {
986 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
987 key = rcu_dereference(sdata->keys[i]);
988 if (key)
989 break;
990 }
991 }
992 if (key)
993 rx->key = key;
994 }
0c7c10c7 995 return RX_CONTINUE;
571ecf67 996 } else {
39184b15 997 u8 keyid;
3017b80b
JB		 998 /*
999 * The device doesn't give us the IV so we won't be
1000 * able to look up the key. That's ok though, we
1001 * don't need to decrypt the frame, we just won't
1002 * be able to keep statistics accurate.
1003 * Except for key threshold notifications, should
1004 * we somehow allow the driver to tell us which key
1005 * the hardware used if this flag is set?
1006 */
eb9fb5b8
JB		 1007 if ((status->flag & RX_FLAG_DECRYPTED) &&
1008 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1009 return RX_CONTINUE;
3017b80b 1010
761ab470 1011 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1012
1013 if (rx->skb->len < 8 + hdrlen)
e4c26add 1014 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1015
1016 /*
1017 * no need to call ieee80211_wep_get_keyidx,
1018 * it verifies a bunch of things we've done already
1019 */
39184b15
ZY		 1020 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1021 keyidx = keyid >> 6;
3017b80b 1022
e31b8213
JB		 1023 /* check per-station GTK first, if multicast packet */
1024 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1025 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1026
e31b8213
JB		 1027 /* if not found, try default key */
1028 if (!rx->key) {
1029 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1030
1031 /*
1032 * RSNA-protected unicast frames should always be
1033 * sent with pairwise or station-to-station keys,
1034 * but for WEP we allow using a key index as well.
1035 */
1036 if (rx->key &&
1037 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1038 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1039 !is_multicast_ether_addr(hdr->addr1))
1040 rx->key = NULL;
1041 }
571ecf67
JB		 1042 }
1043
3017b80b 1044 if (rx->key) {
95acac61
JB		 1045 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1046 return RX_DROP_MONITOR;
1047
571ecf67 1048 rx->key->tx_rx_count++;
011bfcc4 1049 /* TODO: add threshold stuff again */
1990af8d 1050 } else {
e4c26add 1051 return RX_DROP_MONITOR;
70f08765
JB		 1052 }
1053
39184b15
ZY		 1054 if (skb_linearize(rx->skb))
1055 return RX_DROP_UNUSABLE;
761ab470 1056 /* the hdr variable is invalid now! */
1990af8d 1057
97359d12
JB		 1058 switch (rx->key->conf.cipher) {
1059 case WLAN_CIPHER_SUITE_WEP40:
1060 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1061 /* Check for weak IVs if possible */
1062 if (rx->sta && ieee80211_is_data(fc) &&
1063 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1064 !(status->flag & RX_FLAG_DECRYPTED)) &&
1065 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1066 rx->sta->wep_weak_iv_count++;
1067
e2f036da
MN		 1068 result = ieee80211_crypto_wep_decrypt(rx);
1069 break;
97359d12 1070 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1071 result = ieee80211_crypto_tkip_decrypt(rx);
1072 break;
97359d12 1073 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1074 result = ieee80211_crypto_ccmp_decrypt(rx);
1075 break;
97359d12 1076 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1077 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1078 break;
3ffc2a90
JB		 1079 default:
1080 /*
1081 * We can reach here only with HW-only algorithms
1082 * but why didn't it decrypt the frame?!
1083 */
1084 return RX_DROP_UNUSABLE;
70f08765
JB		 1085 }
1086
e2f036da 1087 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1088 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1089
1090 return result;
70f08765
JB		 1091}
1092
572e0012
KV		 1093static ieee80211_rx_result debug_noinline
1094ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1095{
1096 struct ieee80211_local *local;
1097 struct ieee80211_hdr *hdr;
1098 struct sk_buff *skb;
1099
1100 local = rx->local;
1101 skb = rx->skb;
1102 hdr = (struct ieee80211_hdr *) skb->data;
1103
1104 if (!local->pspolling)
1105 return RX_CONTINUE;
1106
1107 if (!ieee80211_has_fromds(hdr->frame_control))
1108 /* this is not from AP */
1109 return RX_CONTINUE;
1110
1111 if (!ieee80211_is_data(hdr->frame_control))
1112 return RX_CONTINUE;
1113
1114 if (!ieee80211_has_moredata(hdr->frame_control)) {
1115 /* AP has no more frames buffered for us */
1116 local->pspolling = false;
1117 return RX_CONTINUE;
1118 }
1119
1120 /* more data bit is set, let's request a new frame from the AP */
1121 ieee80211_send_pspoll(local, rx->sdata);
1122
1123 return RX_CONTINUE;
1124}
1125
133b8226 1126static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1127{
133b8226 1128 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1129 struct ieee80211_local *local = sdata->local;
0795af57 1130
3e122be0 1131 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1132 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1133 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1134 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1135#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1136 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1137 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1138#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1139}
1140
ff9458d3 1141static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1142{
133b8226 1143 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1144
3e122be0 1145 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1146
571ecf67 1147#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1148 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1149 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1150#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1151
c2c98fde 1152 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1153#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1154 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1155 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1157 return;
1158 }
1159
1160 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1161}
1162
d057e5a3
AN		 1163int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1164{
1165 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1166 bool in_ps;
1167
1168 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1169
1170 /* Don't let the same PS state be set twice */
c2c98fde 1171 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1172 if ((start && in_ps) || (!start && !in_ps))
1173 return -EINVAL;
1174
1175 if (start)
1176 ap_sta_ps_start(sta_inf);
1177 else
1178 ap_sta_ps_end(sta_inf);
1179
1180 return 0;
1181}
1182EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1183
47086fc5
JB		 1184static ieee80211_rx_result debug_noinline
1185ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1186{
1187 struct ieee80211_sub_if_data *sdata = rx->sdata;
1188 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1190 int tid, ac;
1191
1192 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1193 return RX_CONTINUE;
1194
1195 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1197 return RX_CONTINUE;
1198
1199 /*
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1203 */
1204 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1205 return RX_CONTINUE;
1206
1207 /*
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1211 */
c2c98fde 1212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1213 return RX_CONTINUE;
1214
1215 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1216 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1218 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1219 else
c2c98fde 1220 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1221 }
47086fc5
JB		 1222
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx->skb);
1226
1227 return RX_QUEUED;
1228 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230 ieee80211_has_pm(hdr->frame_control) &&
1231 (ieee80211_is_data_qos(hdr->frame_control) ||
1232 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234 ac = ieee802_1d_to_ac[tid & 7];
1235
1236 /*
1237 * If this AC is not trigger-enabled do nothing.
1238 *
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1242 */
1243 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1244 return RX_CONTINUE;
1245
1246 /* if we are in a service period, do nothing */
c2c98fde 1247 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1248 return RX_CONTINUE;
1249
c2c98fde 1250 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1251 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1252 else
c2c98fde 1253 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1254 }
1255
1256 return RX_CONTINUE;
1257}
1258
49461622 1259static ieee80211_rx_result debug_noinline
5cf121c3 1260ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1261{
1262 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1263 struct sk_buff *skb = rx->skb;
1264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1266
1267 if (!sta)
9ae54c84 1268 return RX_CONTINUE;
571ecf67 1269
b291ba11
JB		 1270 /*
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1274 */
05c914fe 1275 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1276 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1277 NL80211_IFTYPE_ADHOC);
3af6334c 1278 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1279 sta->last_rx = jiffies;
3af6334c
FF		 1280 if (ieee80211_is_data(hdr->frame_control)) {
1281 sta->last_rx_rate_idx = status->rate_idx;
1282 sta->last_rx_rate_flag = status->flag;
1283 }
1284 }
b291ba11
JB		 1285 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1286 /*
33b64eb2
LCC		 1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
571ecf67 1289 */
b291ba11 1290 sta->last_rx = jiffies;
3af6334c
FF		 1291 if (ieee80211_is_data(hdr->frame_control)) {
1292 sta->last_rx_rate_idx = status->rate_idx;
1293 sta->last_rx_rate_flag = status->flag;
1294 }
571ecf67
JB		 1295 }
1296
554891e6 1297 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1298 return RX_CONTINUE;
571ecf67 1299
3cf335d5
KV		 1300 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301 ieee80211_sta_rx_notify(rx->sdata, hdr);
1302
571ecf67
JB		 1303 sta->rx_fragments++;
1304 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1305 sta->last_signal = status->signal;
541a45a1 1306 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1307
72eaa43a
JB		 1308 /*
1309 * Change STA power saving mode only at the end of a frame
1310 * exchange sequence.
1311 */
d057e5a3
AN		 1312 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1313 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1314 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1315 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1316 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1317 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1318 /*
1319 * Ignore doze->wake transitions that are
1320 * indicated by non-data frames, the standard
1321 * is unclear here, but for example going to
1322 * PS mode and then scanning would cause a
1323 * doze->wake transition for the probe request,
1324 * and that is clearly undesirable.
1325 */
1326 if (ieee80211_is_data(hdr->frame_control) &&
1327 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1328 ap_sta_ps_end(sta);
72eaa43a
JB		 1329 } else {
1330 if (ieee80211_has_pm(hdr->frame_control))
1331 ap_sta_ps_start(sta);
1332 }
571ecf67
JB		 1333 }
1334
22403def
JB		 1335 /*
1336 * Drop (qos-)data::nullfunc frames silently, since they
1337 * are used only to control station power saving mode.
1338 */
1339 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1340 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1341 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1342
1343 /*
1344 * If we receive a 4-addr nullfunc frame from a STA
1345 * that was not moved to a 4-addr STA vlan yet, drop
1346 * the frame to the monitor interface, to make sure
1347 * that hostapd sees it
1348 */
1349 if (ieee80211_has_a4(hdr->frame_control) &&
1350 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1352 !rx->sdata->u.vlan.sta)))
1353 return RX_DROP_MONITOR;
22403def
JB		 1354 /*
1355 * Update counter and free packet here to avoid
1356 * counting this as a dropped packed.
1357 */
571ecf67
JB		 1358 sta->rx_packets++;
1359 dev_kfree_skb(rx->skb);
9ae54c84 1360 return RX_QUEUED;
571ecf67
JB		 1361 }
1362
9ae54c84 1363 return RX_CONTINUE;
571ecf67
JB		 1364} /* ieee80211_rx_h_sta_process */
1365
571ecf67
JB		 1366static inline struct ieee80211_fragment_entry *
1367ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1368 unsigned int frag, unsigned int seq, int rx_queue,
1369 struct sk_buff **skb)
1370{
1371 struct ieee80211_fragment_entry *entry;
1372 int idx;
1373
1374 idx = sdata->fragment_next;
1375 entry = &sdata->fragments[sdata->fragment_next++];
1376 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1377 sdata->fragment_next = 0;
1378
1379 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1380#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1381 struct ieee80211_hdr *hdr =
1382 (struct ieee80211_hdr *) entry->skb_list.next->data;
1383 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1384 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1385 "addr1=%pM addr2=%pM\n",
47846c9b 1386 sdata->name, idx,
571ecf67 1387 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1388 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1389#endif
571ecf67
JB		 1390 __skb_queue_purge(&entry->skb_list);
1391 }
1392
1393 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1394 *skb = NULL;
1395 entry->first_frag_time = jiffies;
1396 entry->seq = seq;
1397 entry->rx_queue = rx_queue;
1398 entry->last_frag = frag;
1399 entry->ccmp = 0;
1400 entry->extra_len = 0;
1401
1402 return entry;
1403}
1404
1405static inline struct ieee80211_fragment_entry *
1406ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1407 unsigned int frag, unsigned int seq,
571ecf67
JB		 1408 int rx_queue, struct ieee80211_hdr *hdr)
1409{
1410 struct ieee80211_fragment_entry *entry;
1411 int i, idx;
1412
1413 idx = sdata->fragment_next;
1414 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1415 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1416
1417 idx--;
1418 if (idx < 0)
1419 idx = IEEE80211_FRAGMENT_MAX - 1;
1420
1421 entry = &sdata->fragments[idx];
1422 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1423 entry->rx_queue != rx_queue ||
1424 entry->last_frag + 1 != frag)
1425 continue;
1426
b73d70ad 1427 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1428
b73d70ad
HH		 1429 /*
1430 * Check ftype and addresses are equal, else check next fragment
1431 */
1432 if (((hdr->frame_control ^ f_hdr->frame_control) &
1433 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1434 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1435 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1436 continue;
1437
ab46623e 1438 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1439 __skb_queue_purge(&entry->skb_list);
1440 continue;
1441 }
1442 return entry;
1443 }
1444
1445 return NULL;
1446}
1447
49461622 1448static ieee80211_rx_result debug_noinline
5cf121c3 1449ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1450{
1451 struct ieee80211_hdr *hdr;
1452 u16 sc;
358c8d9d 1453 __le16 fc;
571ecf67
JB		 1454 unsigned int frag, seq;
1455 struct ieee80211_fragment_entry *entry;
1456 struct sk_buff *skb;
554891e6 1457 struct ieee80211_rx_status *status;
571ecf67 1458
b73d70ad 1459 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1460 fc = hdr->frame_control;
571ecf67
JB		 1461 sc = le16_to_cpu(hdr->seq_ctrl);
1462 frag = sc & IEEE80211_SCTL_FRAG;
1463
358c8d9d 1464 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1465 (rx->skb)->len < 24 ||
1466 is_multicast_ether_addr(hdr->addr1))) {
1467 /* not fragmented */
1468 goto out;
1469 }
1470 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1471
e3cf8b3f
ZY		 1472 if (skb_linearize(rx->skb))
1473 return RX_DROP_UNUSABLE;
1474
058897a4
AK		 1475 /*
1476 * skb_linearize() might change the skb->data and
1477 * previously cached variables (in this case, hdr) need to
1478 * be refreshed with the new data.
1479 */
1480 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1481 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1482
1483 if (frag == 0) {
1484 /* This is the first fragment of a new frame. */
1485 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1486 rx->seqno_idx, &(rx->skb));
97359d12 1487 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1488 ieee80211_has_protected(fc)) {
9e26297a 1489 int queue = rx->security_idx;
571ecf67
JB		 1490 /* Store CCMP PN so that we can verify that the next
1491 * fragment has a sequential PN value. */
1492 entry->ccmp = 1;
1493 memcpy(entry->last_pn,
9190252c 1494 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1495 CCMP_PN_LEN);
1496 }
9ae54c84 1497 return RX_QUEUED;
571ecf67
JB		 1498 }
1499
1500 /* This is a fragment for a frame that should already be pending in
1501 * fragment cache. Add this fragment to the end of the pending entry.
1502 */
9e26297a
JB		 1503 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1504 rx->seqno_idx, hdr);
571ecf67
JB		 1505 if (!entry) {
1506 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1507 return RX_DROP_MONITOR;
571ecf67
JB		 1508 }
1509
1510 /* Verify that MPDUs within one MSDU have sequential PN values.
1511 * (IEEE 802.11i, 8.3.3.4.5) */
1512 if (entry->ccmp) {
1513 int i;
1514 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1515 int queue;
97359d12 1516 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1517 return RX_DROP_UNUSABLE;
571ecf67
JB		 1518 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1519 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1520 pn[i]++;
1521 if (pn[i])
1522 break;
1523 }
9e26297a 1524 queue = rx->security_idx;
9190252c 1525 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1526 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1527 return RX_DROP_UNUSABLE;
571ecf67
JB		 1528 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1529 }
1530
358c8d9d 1531 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1532 __skb_queue_tail(&entry->skb_list, rx->skb);
1533 entry->last_frag = frag;
1534 entry->extra_len += rx->skb->len;
358c8d9d 1535 if (ieee80211_has_morefrags(fc)) {
571ecf67 1536 rx->skb = NULL;
9ae54c84 1537 return RX_QUEUED;
571ecf67
JB		 1538 }
1539
1540 rx->skb = __skb_dequeue(&entry->skb_list);
1541 if (skb_tailroom(rx->skb) < entry->extra_len) {
1542 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1543 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1544 GFP_ATOMIC))) {
1545 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1546 __skb_queue_purge(&entry->skb_list);
e4c26add 1547 return RX_DROP_UNUSABLE;
571ecf67
JB		 1548 }
1549 }
1550 while ((skb = __skb_dequeue(&entry->skb_list))) {
1551 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1552 dev_kfree_skb(skb);
1553 }
1554
1555 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1556 status = IEEE80211_SKB_RXCB(rx->skb);
1557 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1558
1559 out:
1560 if (rx->sta)
1561 rx->sta->rx_packets++;
1562 if (is_multicast_ether_addr(hdr->addr1))
1563 rx->local->dot11MulticastReceivedFrameCount++;
1564 else
1565 ieee80211_led_rx(rx->local);
9ae54c84 1566 return RX_CONTINUE;
571ecf67
JB		 1567}
1568
49461622 1569static ieee80211_rx_result debug_noinline
5cf121c3 1570ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1571{
6e0d114d 1572 u8 *data = rx->skb->data;
238f74a2 1573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1574
238f74a2 1575 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1576 return RX_CONTINUE;
6e0d114d
JB		 1577
1578 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1579 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1580 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1581 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1582 /* change frame type to non QOS */
238f74a2 1583 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1584
9ae54c84 1585 return RX_CONTINUE;
6e0d114d
JB		 1586}
1587
76ee65bf 1588static int
5cf121c3 1589ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1590{
07346f81 1591 if (unlikely(!rx->sta ||
c2c98fde 1592 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1593 return -EACCES;
571ecf67 1594
76ee65bf 1595 return 0;
571ecf67
JB		 1596}
1597
76ee65bf 1598static int
358c8d9d 1599ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1600{
eb9fb5b8
JB		 1601 struct sk_buff *skb = rx->skb;
1602 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1603
3017b80b 1604 /*
7848ba7d
JB		 1605 * Pass through unencrypted frames if the hardware has
1606 * decrypted them already.
3017b80b 1607 */
eb9fb5b8 1608 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1609 return 0;
571ecf67
JB		 1610
1611 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1612 if (unlikely(!ieee80211_has_protected(fc) &&
1613 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1614 ieee80211_is_data(fc) &&
b3fc9c6c 1615 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1616 return -EACCES;
bef5d1c7
JB		 1617
1618 return 0;
1619}
1620
1621static int
1622ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1623{
1624 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1625 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1626 __le16 fc = hdr->frame_control;
bef5d1c7 1627
e3efca0a
JM		 1628 /*
1629 * Pass through unencrypted frames if the hardware has
1630 * decrypted them already.
1631 */
1632 if (status->flag & RX_FLAG_DECRYPTED)
1633 return 0;
bef5d1c7 1634
c2c98fde 1635 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1636 if (unlikely(!ieee80211_has_protected(fc) &&
1637 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1638 rx->key)) {
1639 if (ieee80211_is_deauth(fc))
1640 cfg80211_send_unprot_deauth(rx->sdata->dev,
1641 rx->skb->data,
1642 rx->skb->len);
1643 else if (ieee80211_is_disassoc(fc))
1644 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1645 rx->skb->data,
1646 rx->skb->len);
f2ca3ea4 1647 return -EACCES;
cf4e594e 1648 }
f2ca3ea4 1649 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1650 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1651 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1652 if (ieee80211_is_deauth(fc))
1653 cfg80211_send_unprot_deauth(rx->sdata->dev,
1654 rx->skb->data,
1655 rx->skb->len);
1656 else if (ieee80211_is_disassoc(fc))
1657 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1658 rx->skb->data,
1659 rx->skb->len);
f2ca3ea4 1660 return -EACCES;
cf4e594e 1661 }
f2ca3ea4
JM		 1662 /*
1663 * When using MFP, Action frames are not allowed prior to
1664 * having configured keys.
1665 */
1666 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1667 ieee80211_is_robust_mgmt_frame(
1668 (struct ieee80211_hdr *) rx->skb->data)))
1669 return -EACCES;
1670 }
b3fc9c6c 1671
76ee65bf 1672 return 0;
571ecf67
JB		 1673}
1674
76ee65bf 1675static int
4114fa21 1676__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1677{
eb9fb5b8 1678 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1680 bool check_port_control = false;
1681 struct ethhdr *ehdr;
1682 int ret;
f14543ee 1683
4114fa21 1684 *port_control = false;
9bc383de
JB		 1685 if (ieee80211_has_a4(hdr->frame_control) &&
1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1687 return -1;
9bc383de 1688
fbb327c5
FF		 1689 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1690 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1691
1692 if (!sdata->u.mgd.use_4addr)
1693 return -1;
1694 else
1695 check_port_control = true;
1696 }
1697
9bc383de 1698 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1699 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1700 return -1;
571ecf67 1701
fbb327c5 1702 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1703 if (ret < 0)
fbb327c5
FF		 1704 return ret;
1705
1706 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1707 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1708 *port_control = true;
1709 else if (check_port_control)
fbb327c5
FF		 1710 return -1;
1711
1712 return 0;
76ee65bf 1713}
571ecf67 1714
ce3edf6d
JB		 1715/*
1716 * requires that rx->skb is a frame with ethernet header
1717 */
358c8d9d 1718static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1719{
c97c23e3 1720 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1721 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1722 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1723
1724 /*
1725 * Allow EAPOL frames to us/the PAE group address regardless
1726 * of whether the frame was encrypted or not.
1727 */
a621fa4d 1728 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1729 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1730 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1731 return true;
1732
1733 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1734 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1735 return false;
1736
1737 return true;
1738}
1739
1740/*
1741 * requires that rx->skb is a frame with ethernet header
1742 */
76ee65bf 1743static void
5cf121c3 1744ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1745{
eb9fb5b8
JB		 1746 struct ieee80211_sub_if_data *sdata = rx->sdata;
1747 struct net_device *dev = sdata->dev;
76ee65bf 1748 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1749 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1750 struct sta_info *dsta;
554891e6 1751 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1752
76ee65bf
RR		 1753 skb = rx->skb;
1754 xmit_skb = NULL;
571ecf67 1755
05c914fe
JB		 1756 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1757 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1758 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1759 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1760 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1761 if (is_multicast_ether_addr(ehdr->h_dest)) {
1762 /*
1763 * send multicast frames both to higher layers in
1764 * local net stack and back to the wireless medium
1765 */
76ee65bf
RR		 1766 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1767 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1768 printk(KERN_DEBUG "%s: failed to clone "
1769 "multicast frame\n", dev->name);
1770 } else {
abe60632
JB		 1771 dsta = sta_info_get(sdata, skb->data);
1772 if (dsta) {
ce3edf6d
JB		 1773 /*
1774 * The destination station is associated to
1775 * this AP (in this VLAN), so send the frame
1776 * directly to it and do not pass it to local
1777 * net stack.
571ecf67 1778 */
76ee65bf 1779 xmit_skb = skb;
571ecf67
JB		 1780 skb = NULL;
1781 }
571ecf67
JB		 1782 }
1783 }
1784
1785 if (skb) {
d1c3a37c
JB		 1786 int align __maybe_unused;
1787
59d9cb07 1788#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1789 /*
1790 * 'align' will only take the values 0 or 2 here
1791 * since all frames are required to be aligned
1792 * to 2-byte boundaries when being passed to
1793 * mac80211. That also explains the __skb_push()
1794 * below.
1795 */
dacb6f1d 1796 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1797 if (align) {
1798 if (WARN_ON(skb_headroom(skb) < 3)) {
1799 dev_kfree_skb(skb);
1800 skb = NULL;
1801 } else {
1802 u8 *data = skb->data;
8ce0b589
ZY		 1803 size_t len = skb_headlen(skb);
1804 skb->data -= align;
1805 memmove(skb->data, data, len);
1806 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1807 }
1808 }
1809#endif
1810
1811 if (skb) {
1812 /* deliver to local stack */
1813 skb->protocol = eth_type_trans(skb, dev);
1814 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1815 netif_receive_skb(skb);
d1c3a37c 1816 }
571ecf67
JB		 1817 }
1818
76ee65bf 1819 if (xmit_skb) {
571ecf67 1820 /* send to wireless media */
f831e909 1821 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1822 skb_reset_network_header(xmit_skb);
1823 skb_reset_mac_header(xmit_skb);
76ee65bf 1824 dev_queue_xmit(xmit_skb);
571ecf67 1825 }
76ee65bf
RR		 1826}
1827
49461622 1828static ieee80211_rx_result debug_noinline
5cf121c3 1829ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1830{
eb9fb5b8 1831 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1832 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1834 __le16 fc = hdr->frame_control;
eaf85ca7 1835 struct sk_buff_head frame_list;
554891e6 1836 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1837
358c8d9d 1838 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1839 return RX_CONTINUE;
fd4c7f2f 1840
358c8d9d 1841 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1842 return RX_DROP_MONITOR;
fd4c7f2f 1843
554891e6 1844 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1845 return RX_CONTINUE;
fd4c7f2f 1846
eaf85ca7
ZY		 1847 if (ieee80211_has_a4(hdr->frame_control) &&
1848 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1849 !rx->sdata->u.vlan.sta)
e4c26add 1850 return RX_DROP_UNUSABLE;
fd4c7f2f 1851
eaf85ca7
ZY		 1852 if (is_multicast_ether_addr(hdr->addr1) &&
1853 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1854 rx->sdata->u.vlan.sta) ||
1855 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1856 rx->sdata->u.mgd.use_4addr)))
e4c26add 1857 return RX_DROP_UNUSABLE;
fd4c7f2f 1858
eaf85ca7
ZY		 1859 skb->dev = dev;
1860 __skb_queue_head_init(&frame_list);
fd4c7f2f 1861
e3cf8b3f
ZY		 1862 if (skb_linearize(skb))
1863 return RX_DROP_UNUSABLE;
1864
eaf85ca7
ZY		 1865 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1866 rx->sdata->vif.type,
8b3becad 1867 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1868
eaf85ca7
ZY		 1869 while (!skb_queue_empty(&frame_list)) {
1870 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1871
358c8d9d 1872 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1873 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1874 continue;
1875 }
eaf85ca7
ZY		 1876 dev->stats.rx_packets++;
1877 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1878
1879 ieee80211_deliver_skb(rx);
1880 }
1881
9ae54c84 1882 return RX_QUEUED;
fd4c7f2f
RR		 1883}
1884
bf94e17b 1885#ifdef CONFIG_MAC80211_MESH
b0dee578 1886static ieee80211_rx_result
e32f85f7
LCC		 1887ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1888{
1889 struct ieee80211_hdr *hdr;
1890 struct ieee80211s_hdr *mesh_hdr;
1891 unsigned int hdrlen;
1892 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1893 struct ieee80211_local *local = rx->local;
eb9fb5b8 1894 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1895 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1896
1897 hdr = (struct ieee80211_hdr *) skb->data;
1898 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1899 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1900
2157fdd6
TP		 1901 /* frame is in RMC, don't forward */
1902 if (ieee80211_is_data(hdr->frame_control) &&
1903 is_multicast_ether_addr(hdr->addr1) &&
1904 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1905 return RX_DROP_MONITOR;
1906
e32f85f7
LCC		 1907 if (!ieee80211_is_data(hdr->frame_control))
1908 return RX_CONTINUE;
1909
1910 if (!mesh_hdr->ttl)
1911 /* illegal frame */
1912 return RX_DROP_MONITOR;
1913
cfee66b0
JC		 1914 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1915 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1916 dropped_frames_congestion);
1917 return RX_DROP_MONITOR;
1918 }
1919
43b7b314 1920 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1921 struct mesh_path *mppath;
43b7b314
JC		 1922 char *proxied_addr;
1923 char *mpp_addr;
1924
1925 if (is_multicast_ether_addr(hdr->addr1)) {
1926 mpp_addr = hdr->addr3;
1927 proxied_addr = mesh_hdr->eaddr1;
1928 } else {
1929 mpp_addr = hdr->addr4;
1930 proxied_addr = mesh_hdr->eaddr2;
1931 }
79617dee 1932
79617dee 1933 rcu_read_lock();
43b7b314 1934 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1935 if (!mppath) {
43b7b314 1936 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1937 } else {
1938 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1939 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1940 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1941 spin_unlock_bh(&mppath->state_lock);
1942 }
1943 rcu_read_unlock();
1944 }
1945
3c5772a5
JC		 1946 /* Frame has reached destination. Don't forward */
1947 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1948 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1949 return RX_CONTINUE;
1950
d0ce1855 1951 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
e32f85f7
LCC		 1952 mesh_hdr->ttl--;
1953
554891e6 1954 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1955 if (!mesh_hdr->ttl)
472dbc45 1956 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1957 dropped_frames_ttl);
1958 else {
1959 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1960 struct ieee80211_tx_info *info;
1961
e32f85f7
LCC		 1962 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1963
1964 if (!fwd_skb && net_ratelimit())
1965 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1966 sdata->name);
919bbad5 1967 if (!fwd_skb)
b51aff05 1968 goto out;
e32f85f7
LCC		 1969
1970 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1971 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1972 info = IEEE80211_SKB_CB(fwd_skb);
1973 memset(info, 0, sizeof(*info));
1974 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1975 info->control.vif = &rx->sdata->vif;
d0ce1855 1976 info->control.jiffies = jiffies;
4777be41 1977 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
c8a61a7d
DW		 1978 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1979 fwded_mcast);
4777be41 1980 } else {
3c5772a5
JC		 1981 int err;
1982 /*
1983 * Save TA to addr1 to send TA a path error if a
1984 * suitable next hop is not found
1985 */
1986 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1987 ETH_ALEN);
3c5772a5 1988 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1989 /* Failed to immediately resolve next hop:
1990 * fwded frame was dropped or will be added
1991 * later to the pending skb queue. */
1992 if (err)
1993 return RX_DROP_MONITOR;
c8a61a7d
DW		 1994
1995 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1996 fwded_unicast);
249b405c
JC		 1997 }
1998 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1999 fwded_frames);
3b8d81e0 2000 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 2001 }
2002 }
2003
b51aff05 2004 out:
3c5772a5 2005 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2006 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2007 return RX_CONTINUE;
2008 else
2009 return RX_DROP_MONITOR;
2010}
bf94e17b 2011#endif
e32f85f7 2012
49461622 2013static ieee80211_rx_result debug_noinline
5cf121c3 2014ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2015{
eb9fb5b8 2016 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2017 struct ieee80211_local *local = rx->local;
eb9fb5b8 2018 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2019 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2020 __le16 fc = hdr->frame_control;
4114fa21 2021 bool port_control;
ce3edf6d 2022 int err;
76ee65bf 2023
358c8d9d 2024 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2025 return RX_CONTINUE;
76ee65bf 2026
358c8d9d 2027 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2028 return RX_DROP_MONITOR;
76ee65bf 2029
f14543ee
FF		 2030 /*
2031 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2032 * that a 4-addr station can be detected and moved into a separate VLAN
2033 */
2034 if (ieee80211_has_a4(hdr->frame_control) &&
2035 sdata->vif.type == NL80211_IFTYPE_AP)
2036 return RX_DROP_MONITOR;
2037
4114fa21 2038 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2039 if (unlikely(err))
e4c26add 2040 return RX_DROP_UNUSABLE;
76ee65bf 2041
358c8d9d 2042 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2043 return RX_DROP_MONITOR;
ce3edf6d 2044
4114fa21
FF		 2045 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2046 unlikely(port_control) && sdata->bss) {
2047 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2048 u.ap);
2049 dev = sdata->dev;
2050 rx->sdata = sdata;
2051 }
2052
76ee65bf
RR		 2053 rx->skb->dev = dev;
2054
2055 dev->stats.rx_packets++;
2056 dev->stats.rx_bytes += rx->skb->len;
2057
08ca944e 2058 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2059 !is_multicast_ether_addr(
2060 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2061 (!local->scanning &&
2062 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2063 mod_timer(&local->dynamic_ps_timer, jiffies +
2064 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2065 }
2066
76ee65bf 2067 ieee80211_deliver_skb(rx);
571ecf67 2068
9ae54c84 2069 return RX_QUEUED;
571ecf67
JB		 2070}
2071
49461622 2072static ieee80211_rx_result debug_noinline
24a8fdad 2073ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2074{
2075 struct ieee80211_local *local = rx->local;
2076 struct ieee80211_hw *hw = &local->hw;
2077 struct sk_buff *skb = rx->skb;
a7767f95 2078 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2079 struct tid_ampdu_rx *tid_agg_rx;
2080 u16 start_seq_num;
2081 u16 tid;
2082
a7767f95 2083 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2084 return RX_CONTINUE;
71364716 2085
a7767f95 2086 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2087 struct {
2088 __le16 control, start_seq_num;
2089 } __packed bar_data;
2090
71364716 2091 if (!rx->sta)
a02ae758 2092 return RX_DROP_MONITOR;
8ae5977f
JB		 2093
2094 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2095 &bar_data, sizeof(bar_data)))
2096 return RX_DROP_MONITOR;
2097
8ae5977f 2098 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2099
2100 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2101 if (!tid_agg_rx)
a02ae758 2102 return RX_DROP_MONITOR;
71364716 2103
8ae5977f 2104 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2105
2106 /* reset session timer */
20ad19d0
JB		 2107 if (tid_agg_rx->timeout)
2108 mod_timer(&tid_agg_rx->session_timer,
2109 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2110
dd318575 2111 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2112 /* release stored frames up to start of BAR */
24a8fdad 2113 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2114 spin_unlock(&tid_agg_rx->reorder_lock);
2115
a02ae758
JB		 2116 kfree_skb(skb);
2117 return RX_QUEUED;
71364716
RR		 2118 }
2119
08daecae
JB		 2120 /*
2121 * After this point, we only want management frames,
2122 * so we can drop all remaining control frames to
2123 * cooked monitor interfaces.
2124 */
2125 return RX_DROP_MONITOR;
71364716
RR		 2126}
2127
f4f727a6
JM		 2128static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2129 struct ieee80211_mgmt *mgmt,
2130 size_t len)
fea14732
JM		 2131{
2132 struct ieee80211_local *local = sdata->local;
2133 struct sk_buff *skb;
2134 struct ieee80211_mgmt *resp;
2135
47846c9b 2136 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2137 /* Not to own unicast address */
2138 return;
2139 }
2140
46900298
JB		 2141 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2142 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2143 /* Not from the current AP or not associated yet. */
fea14732
JM		 2144 return;
2145 }
2146
2147 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2148 /* Too short SA Query request frame */
2149 return;
2150 }
2151
2152 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2153 if (skb == NULL)
2154 return;
2155
2156 skb_reserve(skb, local->hw.extra_tx_headroom);
2157 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2158 memset(resp, 0, 24);
2159 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2160 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2161 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2162 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2163 IEEE80211_STYPE_ACTION);
2164 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2165 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2166 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2167 memcpy(resp->u.action.u.sa_query.trans_id,
2168 mgmt->u.action.u.sa_query.trans_id,
2169 WLAN_SA_QUERY_TR_ID_LEN);
2170
62ae67be 2171 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2172}
2173
2e161f78
JB		 2174static ieee80211_rx_result debug_noinline
2175ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2176{
2177 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2178 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2179
2180 /*
2181 * From here on, look only at management frames.
2182 * Data and control frames are already handled,
2183 * and unknown (reserved) frames are useless.
2184 */
2185 if (rx->skb->len < 24)
2186 return RX_DROP_MONITOR;
2187
2188 if (!ieee80211_is_mgmt(mgmt->frame_control))
2189 return RX_DROP_MONITOR;
2190
554891e6 2191 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2192 return RX_DROP_MONITOR;
2193
2194 if (ieee80211_drop_unencrypted_mgmt(rx))
2195 return RX_DROP_UNUSABLE;
2196
2197 return RX_CONTINUE;
2198}
2199
de1ede7a
JB		 2200static ieee80211_rx_result debug_noinline
2201ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2202{
2203 struct ieee80211_local *local = rx->local;
eb9fb5b8 2204 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2205 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2206 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2207 int len = rx->skb->len;
2208
2209 if (!ieee80211_is_action(mgmt->frame_control))
2210 return RX_CONTINUE;
2211
026331c4
JM		 2212 /* drop too small frames */
2213 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2214 return RX_DROP_UNUSABLE;
de1ede7a 2215
026331c4 2216 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2217 return RX_DROP_UNUSABLE;
de1ede7a 2218
554891e6 2219 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2220 return RX_DROP_UNUSABLE;
97ebe12a 2221
de1ede7a
JB		 2222 switch (mgmt->u.action.category) {
2223 case WLAN_CATEGORY_BACK:
8abd3f9b 2224 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2225 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b
JB		 2226 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2227 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2228 break;
8abd3f9b 2229
026331c4
JM		 2230 /* verify action_code is present */
2231 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2232 break;
2233
de1ede7a
JB		 2234 switch (mgmt->u.action.u.addba_req.action_code) {
2235 case WLAN_ACTION_ADDBA_REQ:
2236 if (len < (IEEE80211_MIN_ACTION_SIZE +
2237 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2238 goto invalid;
2239 break;
de1ede7a
JB		 2240 case WLAN_ACTION_ADDBA_RESP:
2241 if (len < (IEEE80211_MIN_ACTION_SIZE +
2242 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2243 goto invalid;
2244 break;
de1ede7a
JB		 2245 case WLAN_ACTION_DELBA:
2246 if (len < (IEEE80211_MIN_ACTION_SIZE +
2247 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2248 goto invalid;
2249 break;
2250 default:
2251 goto invalid;
de1ede7a 2252 }
bed7ee6e 2253
8b58ff83 2254 goto queue;
39192c0b
JB		 2255 case WLAN_CATEGORY_SPECTRUM_MGMT:
2256 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2257 break;
46900298
JB		 2258
2259 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2260 break;
46900298 2261
026331c4
JM		 2262 /* verify action_code is present */
2263 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2264 break;
2265
39192c0b
JB		 2266 switch (mgmt->u.action.u.measurement.action_code) {
2267 case WLAN_ACTION_SPCT_MSR_REQ:
2268 if (len < (IEEE80211_MIN_ACTION_SIZE +
2269 sizeof(mgmt->u.action.u.measurement)))
84040805 2270 break;
39192c0b 2271 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2272 goto handled;
c481ec97
S		 2273 case WLAN_ACTION_SPCT_CHL_SWITCH:
2274 if (len < (IEEE80211_MIN_ACTION_SIZE +
2275 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2276 break;
c481ec97 2277
cc32abd4 2278 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2279 break;
cc32abd4 2280
46900298 2281 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2282 break;
c481ec97 2283
8b58ff83 2284 goto queue;
39192c0b
JB		 2285 }
2286 break;
fea14732
JM		 2287 case WLAN_CATEGORY_SA_QUERY:
2288 if (len < (IEEE80211_MIN_ACTION_SIZE +
2289 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2290 break;
2291
fea14732
JM		 2292 switch (mgmt->u.action.u.sa_query.action) {
2293 case WLAN_ACTION_SA_QUERY_REQUEST:
2294 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2295 break;
fea14732 2296 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2297 goto handled;
fea14732
JM		 2298 }
2299 break;
8db09850
TP		 2300 case WLAN_CATEGORY_SELF_PROTECTED:
2301 switch (mgmt->u.action.u.self_prot.action_code) {
2302 case WLAN_SP_MESH_PEERING_OPEN:
2303 case WLAN_SP_MESH_PEERING_CLOSE:
2304 case WLAN_SP_MESH_PEERING_CONFIRM:
2305 if (!ieee80211_vif_is_mesh(&sdata->vif))
2306 goto invalid;
2307 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2308 /* userspace handles this frame */
2309 break;
2310 goto queue;
2311 case WLAN_SP_MGK_INFORM:
2312 case WLAN_SP_MGK_ACK:
2313 if (!ieee80211_vif_is_mesh(&sdata->vif))
2314 goto invalid;
2315 break;
2316 }
2317 break;
d3aaec8a 2318 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2319 if (!ieee80211_vif_is_mesh(&sdata->vif))
2320 break;
25d49e4d
TP		 2321 if (mesh_action_is_path_sel(mgmt) &&
2322 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2323 break;
2324 goto queue;
84040805 2325 }
026331c4 2326
2e161f78
JB		 2327 return RX_CONTINUE;
2328
bed7ee6e 2329 invalid:
554891e6 2330 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2331 /* will return in the next handlers */
2332 return RX_CONTINUE;
2333
2334 handled:
2335 if (rx->sta)
2336 rx->sta->rx_packets++;
2337 dev_kfree_skb(rx->skb);
2338 return RX_QUEUED;
2339
2340 queue:
2341 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2342 skb_queue_tail(&sdata->skb_queue, rx->skb);
2343 ieee80211_queue_work(&local->hw, &sdata->work);
2344 if (rx->sta)
2345 rx->sta->rx_packets++;
2346 return RX_QUEUED;
2347}
2348
2349static ieee80211_rx_result debug_noinline
2350ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2351{
554891e6 2352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2353
2354 /* skip known-bad action frames and return them in the next handler */
554891e6 2355 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2356 return RX_CONTINUE;
d7907448 2357
026331c4
JM		 2358 /*
2359 * Getting here means the kernel doesn't know how to handle
2360 * it, but maybe userspace does ... include returned frames
2361 * so userspace can register for those to know whether ones
2362 * it transmitted were processed or returned.
2363 */
026331c4 2364
2e161f78
JB		 2365 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2366 rx->skb->data, rx->skb->len,
2367 GFP_ATOMIC)) {
2368 if (rx->sta)
2369 rx->sta->rx_packets++;
2370 dev_kfree_skb(rx->skb);
2371 return RX_QUEUED;
2372 }
2373
2374
2375 return RX_CONTINUE;
2376}
2377
2378static ieee80211_rx_result debug_noinline
2379ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2380{
2381 struct ieee80211_local *local = rx->local;
2382 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2383 struct sk_buff *nskb;
2384 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2385 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2386
2387 if (!ieee80211_is_action(mgmt->frame_control))
2388 return RX_CONTINUE;
2389
2390 /*
2391 * For AP mode, hostapd is responsible for handling any action
2392 * frames that we didn't handle, including returning unknown
2393 * ones. For all other modes we will return them to the sender,
2394 * setting the 0x80 bit in the action category, as required by
2395 * 802.11-2007 7.3.1.11.
2396 * Newer versions of hostapd shall also use the management frame
2397 * registration mechanisms, but older ones still use cooked
2398 * monitor interfaces so push all frames there.
2399 */
554891e6 2400 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2401 (sdata->vif.type == NL80211_IFTYPE_AP ||
2402 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2403 return RX_DROP_MONITOR;
026331c4 2404
84040805
JB		 2405 /* do not return rejected action frames */
2406 if (mgmt->u.action.category & 0x80)
2407 return RX_DROP_UNUSABLE;
2408
2409 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2410 GFP_ATOMIC);
2411 if (nskb) {
292b4df6 2412 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2413
292b4df6
JL		 2414 nmgmt->u.action.category |= 0x80;
2415 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2416 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2417
2418 memset(nskb->cb, 0, sizeof(nskb->cb));
2419
2420 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2421 }
39192c0b
JB		 2422 dev_kfree_skb(rx->skb);
2423 return RX_QUEUED;
de1ede7a
JB		 2424}
2425
49461622 2426static ieee80211_rx_result debug_noinline
5cf121c3 2427ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2428{
eb9fb5b8 2429 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2430 ieee80211_rx_result rxs;
77a121c3
JB		 2431 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2432 __le16 stype;
571ecf67 2433
af6b6374
JB		 2434 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2435 if (rxs != RX_CONTINUE)
2436 return rxs;
2437
77a121c3 2438 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2439
77a121c3
JB		 2440 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2441 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2442 sdata->vif.type != NL80211_IFTYPE_STATION)
2443 return RX_DROP_MONITOR;
472dbc45 2444
77a121c3
JB		 2445 switch (stype) {
2446 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2447 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2448 /* process for all: mesh, mlme, ibss */
2449 break;
2450 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2451 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2452 if (is_multicast_ether_addr(mgmt->da) &&
2453 !is_broadcast_ether_addr(mgmt->da))
2454 return RX_DROP_MONITOR;
2455
77a121c3
JB		 2456 /* process only for station */
2457 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2458 return RX_DROP_MONITOR;
2459 break;
2460 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2461 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2462 /* process only for ibss */
2463 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2464 return RX_DROP_MONITOR;
2465 break;
2466 default:
2467 return RX_DROP_MONITOR;
2468 }
f9d540ee 2469
77a121c3 2470 /* queue up frame and kick off work to process it */
c1475ca9 2471 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2472 skb_queue_tail(&sdata->skb_queue, rx->skb);
2473 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2474 if (rx->sta)
2475 rx->sta->rx_packets++;
46900298 2476
77a121c3 2477 return RX_QUEUED;
571ecf67
JB		 2478}
2479
5cf121c3 2480/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2481static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2482 struct ieee80211_rate *rate)
3d30d949
MW		 2483{
2484 struct ieee80211_sub_if_data *sdata;
2485 struct ieee80211_local *local = rx->local;
2486 struct ieee80211_rtap_hdr {
2487 struct ieee80211_radiotap_header hdr;
2488 u8 flags;
5f0b7de5 2489 u8 rate_or_pad;
3d30d949
MW		 2490 __le16 chan_freq;
2491 __le16 chan_flags;
bc10502d 2492 } __packed *rthdr;
3d30d949
MW		 2493 struct sk_buff *skb = rx->skb, *skb2;
2494 struct net_device *prev_dev = NULL;
eb9fb5b8 2495 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2496
554891e6
JB		 2497 /*
2498 * If cooked monitor has been processed already, then
2499 * don't do it again. If not, set the flag.
2500 */
2501 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2502 goto out_free_skb;
554891e6 2503 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2504
152c477a
JB		 2505 /* If there are no cooked monitor interfaces, just free the SKB */
2506 if (!local->cooked_mntrs)
2507 goto out_free_skb;
2508
3d30d949
MW		 2509 if (skb_headroom(skb) < sizeof(*rthdr) &&
2510 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2511 goto out_free_skb;
2512
2513 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2514 memset(rthdr, 0, sizeof(*rthdr));
2515 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2516 rthdr->hdr.it_present =
2517 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2518 (1 << IEEE80211_RADIOTAP_CHANNEL));
2519
5f0b7de5
JB		 2520 if (rate) {
2521 rthdr->rate_or_pad = rate->bitrate / 5;
2522 rthdr->hdr.it_present |=
2523 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2524 }
3d30d949
MW		 2525 rthdr->chan_freq = cpu_to_le16(status->freq);
2526
2527 if (status->band == IEEE80211_BAND_5GHZ)
2528 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2529 IEEE80211_CHAN_5GHZ);
2530 else
2531 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2532 IEEE80211_CHAN_2GHZ);
2533
2534 skb_set_mac_header(skb, 0);
2535 skb->ip_summed = CHECKSUM_UNNECESSARY;
2536 skb->pkt_type = PACKET_OTHERHOST;
2537 skb->protocol = htons(ETH_P_802_2);
2538
2539 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2540 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2541 continue;
2542
05c914fe 2543 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2544 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2545 continue;
2546
2547 if (prev_dev) {
2548 skb2 = skb_clone(skb, GFP_ATOMIC);
2549 if (skb2) {
2550 skb2->dev = prev_dev;
5548a8a1 2551 netif_receive_skb(skb2);
3d30d949
MW		 2552 }
2553 }
2554
2555 prev_dev = sdata->dev;
2556 sdata->dev->stats.rx_packets++;
2557 sdata->dev->stats.rx_bytes += skb->len;
2558 }
2559
2560 if (prev_dev) {
2561 skb->dev = prev_dev;
5548a8a1 2562 netif_receive_skb(skb);
554891e6
JB		 2563 return;
2564 }
3d30d949
MW		 2565
2566 out_free_skb:
2567 dev_kfree_skb(skb);
2568}
2569
aa0c8636
CL		 2570static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2571 ieee80211_rx_result res)
2572{
2573 switch (res) {
2574 case RX_DROP_MONITOR:
2575 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2576 if (rx->sta)
2577 rx->sta->rx_dropped++;
2578 /* fall through */
2579 case RX_CONTINUE: {
2580 struct ieee80211_rate *rate = NULL;
2581 struct ieee80211_supported_band *sband;
2582 struct ieee80211_rx_status *status;
2583
2584 status = IEEE80211_SKB_RXCB((rx->skb));
2585
2586 sband = rx->local->hw.wiphy->bands[status->band];
2587 if (!(status->flag & RX_FLAG_HT))
2588 rate = &sband->bitrates[status->rate_idx];
2589
2590 ieee80211_rx_cooked_monitor(rx, rate);
2591 break;
2592 }
2593 case RX_DROP_UNUSABLE:
2594 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2595 if (rx->sta)
2596 rx->sta->rx_dropped++;
2597 dev_kfree_skb(rx->skb);
2598 break;
2599 case RX_QUEUED:
2600 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2601 break;
2602 }
2603}
571ecf67 2604
24a8fdad 2605static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2606{
58905290 2607 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2608 struct sk_buff *skb;
8944b79f 2609
e32f85f7
LCC		 2610#define CALL_RXH(rxh) \
2611 do { \
2612 res = rxh(rx); \
2613 if (res != RX_CONTINUE) \
2569a826 2614 goto rxh_next; \
e32f85f7 2615 } while (0);
49461622 2616
24a8fdad
CL		 2617 spin_lock(&rx->local->rx_skb_queue.lock);
2618 if (rx->local->running_rx_handler)
2619 goto unlock;
2620
2621 rx->local->running_rx_handler = true;
2622
2623 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2624 spin_unlock(&rx->local->rx_skb_queue.lock);
2625
2569a826
JB		 2626 /*
2627 * all the other fields are valid across frames
2628 * that belong to an aMPDU since they are on the
2629 * same TID from the same station
2630 */
2631 rx->skb = skb;
2632
2633 CALL_RXH(ieee80211_rx_h_decrypt)
2634 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2635 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2636 CALL_RXH(ieee80211_rx_h_sta_process)
2637 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2638 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2639 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2640#ifdef CONFIG_MAC80211_MESH
aa0c8636 2641 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2642 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2643#endif
2154c81c
JC		 2644 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2645 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2646 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2647 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2648 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2649 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2650 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2651 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2652 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2653
aa0c8636
CL		 2654 rxh_next:
2655 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2656 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2657#undef CALL_RXH
aa0c8636 2658 }
24a8fdad
CL		 2659
2660 rx->local->running_rx_handler = false;
2661
2662 unlock:
2663 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2664}
2665
4406c376 2666static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2667{
aa0c8636
CL		 2668 ieee80211_rx_result res = RX_DROP_MONITOR;
2669
aa0c8636
CL		 2670#define CALL_RXH(rxh) \
2671 do { \
2672 res = rxh(rx); \
2673 if (res != RX_CONTINUE) \
2674 goto rxh_next; \
2675 } while (0);
2676
2677 CALL_RXH(ieee80211_rx_h_passive_scan)
2678 CALL_RXH(ieee80211_rx_h_check)
2679
24a8fdad 2680 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2681
24a8fdad 2682 ieee80211_rx_handlers(rx);
aa0c8636 2683 return;
49461622 2684
2569a826 2685 rxh_next:
aa0c8636
CL		 2686 ieee80211_rx_handlers_result(rx, res);
2687
2688#undef CALL_RXH
58905290
JB		 2689}
2690
2bff8ebf 2691/*
dd318575
JB		 2692 * This function makes calls into the RX path, therefore
2693 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2694 */
2695void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2696{
554891e6
JB		 2697 struct ieee80211_rx_data rx = {
2698 .sta = sta,
2699 .sdata = sta->sdata,
2700 .local = sta->local,
9e26297a
JB		 2701 /* This is OK -- must be QoS data frame */
2702 .security_idx = tid,
2703 .seqno_idx = tid,
fcf8bd3b 2704 .flags = 0,
554891e6 2705 };
2c15a0cf
CL		 2706 struct tid_ampdu_rx *tid_agg_rx;
2707
2708 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2709 if (!tid_agg_rx)
2710 return;
2bff8ebf 2711
2c15a0cf 2712 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2713 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2714 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2715
24a8fdad 2716 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2717}
2718
571ecf67
JB		 2719/* main receive path */
2720
20b01f80 2721static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2722 struct ieee80211_hdr *hdr)
2723{
20b01f80 2724 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2725 struct sk_buff *skb = rx->skb;
2726 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2727 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2728 int multicast = is_multicast_ether_addr(hdr->addr1);
2729
51fb61e7 2730 switch (sdata->vif.type) {
05c914fe 2731 case NL80211_IFTYPE_STATION:
9bc383de 2732 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2733 return 0;
77fdaa12 2734 if (!multicast &&
47846c9b 2735 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2736 if (!(sdata->dev->flags & IFF_PROMISC) ||
2737 sdata->u.mgd.use_4addr)
23a24def 2738 return 0;
554891e6 2739 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2740 }
2741 break;
05c914fe 2742 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2743 if (!bssid)
2744 return 0;
a7767f95 2745 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2746 return 1;
87291c02 2747 }
46900298 2748 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2749 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2750 return 0;
554891e6 2751 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2752 } else if (!multicast &&
47846c9b 2753 compare_ether_addr(sdata->vif.addr,
23a24def 2754 hdr->addr1) != 0) {
4150c572 2755 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2756 return 0;
554891e6 2757 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2758 } else if (!rx->sta) {
2759 int rate_idx;
eb9fb5b8 2760 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2761 rate_idx = 0; /* TODO: HT rates */
2762 else
eb9fb5b8 2763 rate_idx = status->rate_idx;
34e89507
JB		 2764 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2765 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2766 }
23a24def 2767 break;
05c914fe 2768 case NL80211_IFTYPE_MESH_POINT:
6032f934 2769 if (!multicast &&
47846c9b 2770 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2771 hdr->addr1) != 0) {
2772 if (!(sdata->dev->flags & IFF_PROMISC))
2773 return 0;
2774
554891e6 2775 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2776 }
2777 break;
05c914fe
JB		 2778 case NL80211_IFTYPE_AP_VLAN:
2779 case NL80211_IFTYPE_AP:
23a24def 2780 if (!bssid) {
47846c9b 2781 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2782 hdr->addr1))
2783 return 0;
2784 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2785 sdata->vif.addr)) {
771bbd09 2786 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2787 !ieee80211_is_beacon(hdr->frame_control) &&
2788 !(ieee80211_is_action(hdr->frame_control) &&
2789 sdata->vif.p2p))
23a24def 2790 return 0;
554891e6 2791 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2792 }
23a24def 2793 break;
05c914fe 2794 case NL80211_IFTYPE_WDS:
a7767f95 2795 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2796 return 0;
2797 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2798 return 0;
2799 break;
2ca27bcf 2800 default:
fb1c1cd6
JB		 2801 /* should never get here */
2802 WARN_ON(1);
2803 break;
23a24def
JB		 2804 }
2805
2806 return 1;
2807}
2808
4406c376
JB		 2809/*
2810 * This function returns whether or not the SKB
2811 * was destined for RX processing or not, which,
2812 * if consume is true, is equivalent to whether
2813 * or not the skb was consumed.
2814 */
2815static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2816 struct sk_buff *skb, bool consume)
2817{
2818 struct ieee80211_local *local = rx->local;
2819 struct ieee80211_sub_if_data *sdata = rx->sdata;
2820 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2821 struct ieee80211_hdr *hdr = (void *)skb->data;
2822 int prepares;
2823
2824 rx->skb = skb;
554891e6 2825 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2826 prepares = prepare_for_handlers(rx, hdr);
2827
2828 if (!prepares)
2829 return false;
2830
4406c376
JB		 2831 if (!consume) {
2832 skb = skb_copy(skb, GFP_ATOMIC);
2833 if (!skb) {
2834 if (net_ratelimit())
2835 wiphy_debug(local->hw.wiphy,
b305dae4 2836 "failed to copy skb for %s\n",
4406c376
JB		 2837 sdata->name);
2838 return true;
2839 }
2840
2841 rx->skb = skb;
2842 }
2843
2844 ieee80211_invoke_rx_handlers(rx);
2845 return true;
2846}
2847
571ecf67 2848/*
6368e4b1
RR		 2849 * This is the actual Rx frames handler. as it blongs to Rx path it must
2850 * be called with rcu_read_lock protection.
571ecf67 2851 */
71ebb4aa 2852static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2853 struct sk_buff *skb)
571ecf67 2854{
554891e6 2855 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2856 struct ieee80211_local *local = hw_to_local(hw);
2857 struct ieee80211_sub_if_data *sdata;
571ecf67 2858 struct ieee80211_hdr *hdr;
e3cf8b3f 2859 __le16 fc;
5cf121c3 2860 struct ieee80211_rx_data rx;
4406c376 2861 struct ieee80211_sub_if_data *prev;
56af3268 2862 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2863 int err = 0;
571ecf67 2864
e3cf8b3f 2865 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2866 memset(&rx, 0, sizeof(rx));
2867 rx.skb = skb;
2868 rx.local = local;
72abd81b 2869
e3cf8b3f 2870 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2871 local->dot11ReceivedFragmentCount++;
571ecf67 2872
142b9f50 2873 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2874 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2875 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2876
e3cf8b3f
ZY		 2877 if (ieee80211_is_mgmt(fc))
2878 err = skb_linearize(skb);
2879 else
2880 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2881
2882 if (err) {
2883 dev_kfree_skb(skb);
2884 return;
2885 }
2886
2887 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2888 ieee80211_parse_qos(&rx);
d1c3a37c 2889 ieee80211_verify_alignment(&rx);
38f3714d 2890
e3cf8b3f 2891 if (ieee80211_is_data(fc)) {
56af3268 2892 prev_sta = NULL;
4406c376 2893
2a33bee2 2894 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2895 if (!prev_sta) {
2896 prev_sta = sta;
2897 continue;
2898 }
2899
2900 rx.sta = prev_sta;
2901 rx.sdata = prev_sta->sdata;
4406c376 2902 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2903
56af3268 2904 prev_sta = sta;
4406c376 2905 }
56af3268
BG		 2906
2907 if (prev_sta) {
2908 rx.sta = prev_sta;
2909 rx.sdata = prev_sta->sdata;
2910
4406c376 2911 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2912 return;
8e26d5ad 2913 goto out;
56af3268 2914 }
4406c376
JB		 2915 }
2916
4b0dd98e 2917 prev = NULL;
b2e7771e 2918
4b0dd98e
JB		 2919 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2920 if (!ieee80211_sdata_running(sdata))
2921 continue;
340e11f3 2922
4b0dd98e
JB		 2923 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2924 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2925 continue;
340e11f3 2926
4b0dd98e
JB		 2927 /*
2928 * frame is destined for this interface, but if it's
2929 * not also for the previous one we handle that after
2930 * the loop to avoid copying the SKB once too much
2931 */
4bb29f8c 2932
4b0dd98e 2933 if (!prev) {
abe60632 2934 prev = sdata;
4b0dd98e 2935 continue;
340e11f3 2936 }
4bb29f8c 2937
2a33bee2 2938 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2939 rx.sdata = prev;
2940 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2941
4b0dd98e
JB		 2942 prev = sdata;
2943 }
2944
2945 if (prev) {
2a33bee2 2946 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2947 rx.sdata = prev;
4406c376 2948
4b0dd98e
JB		 2949 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2950 return;
571ecf67 2951 }
4406c376 2952
8e26d5ad 2953 out:
4406c376 2954 dev_kfree_skb(skb);
571ecf67 2955}
6368e4b1
RR		 2956
2957/*
2958 * This is the receive path handler. It is called by a low level driver when an
2959 * 802.11 MPDU is received from the hardware.
2960 */
103bf9f7 2961void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2962{
2963 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2964 struct ieee80211_rate *rate = NULL;
2965 struct ieee80211_supported_band *sband;
f1d58c25 2966 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2967
d20ef63d
JB		 2968 WARN_ON_ONCE(softirq_count() == 0);
2969
77a980dc
JB		 2970 if (WARN_ON(status->band < 0 ||
2971 status->band >= IEEE80211_NUM_BANDS))
2972 goto drop;
8318d78a
JB		 2973
2974 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2975 if (WARN_ON(!sband))
2976 goto drop;
8318d78a 2977
89c3a8ac
JB		 2978 /*
2979 * If we're suspending, it is possible although not too likely
2980 * that we'd be receiving frames after having already partially
2981 * quiesced the stack. We can't process such frames then since
2982 * that might, for example, cause stations to be added or other
2983 * driver callbacks be invoked.
2984 */
77a980dc
JB		 2985 if (unlikely(local->quiescing || local->suspended))
2986 goto drop;
89c3a8ac 2987
ea77f12f
JB		 2988 /*
2989 * The same happens when we're not even started,
2990 * but that's worth a warning.
2991 */
77a980dc
JB		 2992 if (WARN_ON(!local->started))
2993 goto drop;
ea77f12f 2994
fc885189 2995 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2996 /*
fc885189
JB		 2997 * Validate the rate, unless a PLCP error means that
2998 * we probably can't have a valid rate here anyway.
e5d6eb83 2999 */
fc885189
JB		 3000
3001 if (status->flag & RX_FLAG_HT) {
3002 /*
3003 * rate_idx is MCS index, which can be [0-76]
3004 * as documented on:
3005 *
3006 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3007 *
3008 * Anything else would be some sort of driver or
3009 * hardware error. The driver should catch hardware
3010 * errors.
3011 */
3012 if (WARN((status->rate_idx < 0 ||
3013 status->rate_idx > 76),
3014 "Rate marked as an HT rate but passed "
3015 "status->rate_idx is not "
3016 "an MCS index [0-76]: %d (0x%02x)\n",
3017 status->rate_idx,
3018 status->rate_idx))
3019 goto drop;
3020 } else {
3021 if (WARN_ON(status->rate_idx < 0 ||
3022 status->rate_idx >= sband->n_bitrates))
3023 goto drop;
3024 rate = &sband->bitrates[status->rate_idx];
3025 }
0fb8ca45 3026 }
6368e4b1 3027
554891e6
JB		 3028 status->rx_flags = 0;
3029
6368e4b1
RR		 3030 /*
3031 * key references and virtual interfaces are protected using RCU
3032 * and this requires that we are in a read-side RCU section during
3033 * receive processing
3034 */
3035 rcu_read_lock();
3036
3037 /*
3038 * Frames with failed FCS/PLCP checksum are not returned,
3039 * all other frames are returned without radiotap header
3040 * if it was previously present.
3041 * Also, frames with less than 16 bytes are dropped.
3042 */
f1d58c25 3043 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3044 if (!skb) {
3045 rcu_read_unlock();
3046 return;
3047 }
3048
e1e54068
JB		 3049 ieee80211_tpt_led_trig_rx(local,
3050 ((struct ieee80211_hdr *)skb->data)->frame_control,
3051 skb->len);
071d9ac2 3052 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3053
3054 rcu_read_unlock();
77a980dc
JB		 3055
3056 return;
3057 drop:
3058 kfree_skb(skb);
6368e4b1 3059}
103bf9f7 3060EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3061
3062/* This is a version of the rx handler that can be called from hard irq
3063 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3064void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3065{
3066 struct ieee80211_local *local = hw_to_local(hw);
3067
3068 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3069
571ecf67
JB		 3070 skb->pkt_type = IEEE80211_RX_MSG;
3071 skb_queue_tail(&local->skb_queue, skb);
3072 tasklet_schedule(&local->tasklet);
3073}
3074EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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