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mac80211: complete bss_info tracing
[mirror_ubuntu-zesty-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>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e 62
4c298677
JB		 63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
64 RX_FLAG_FAILED_PLCP_CRC |
65 RX_FLAG_AMPDU_IS_ZEROLEN))
b2e7771e 66 return 1;
0869aea0 67 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 68 return 1;
87228f57
HH		 69 if (ieee80211_is_ctl(hdr->frame_control) &&
70 !ieee80211_is_pspoll(hdr->frame_control) &&
71 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 72 return 1;
73 return 0;
74}
75
601ae7f2
BR		 76static int
77ieee80211_rx_radiotap_len(struct ieee80211_local *local,
78 struct ieee80211_rx_status *status)
79{
80 int len;
81
82 /* always present fields */
83 len = sizeof(struct ieee80211_radiotap_header) + 9;
84
6ebacbb7 85 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 86 len += 8;
7fee5372 87 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 88 len += 1;
601ae7f2
BR		 89
90 if (len & 1) /* padding for RX_FLAGS if necessary */
91 len++;
92
6d744bac
JB		 93 if (status->flag & RX_FLAG_HT) /* HT info */
94 len += 3;
95
4c298677
JB		 96 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
97 /* padding */
98 while (len & 3)
99 len++;
100 len += 8;
101 }
102
601ae7f2
BR		 103 return len;
104}
105
00ea6deb 106/*
601ae7f2
BR		 107 * ieee80211_add_rx_radiotap_header - add radiotap header
108 *
109 * add a radiotap header containing all the fields which the hardware provided.
110 */
111static void
112ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
113 struct sk_buff *skb,
601ae7f2 114 struct ieee80211_rate *rate,
973ef21a 115 int rtap_len, bool has_fcs)
601ae7f2 116{
f1d58c25 117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 118 struct ieee80211_radiotap_header *rthdr;
119 unsigned char *pos;
6a86b9c7 120 u16 rx_flags = 0;
601ae7f2
BR		 121
122 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
123 memset(rthdr, 0, rtap_len);
124
125 /* radiotap header, set always present flags */
126 rthdr->it_present =
127 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 128 (1 << IEEE80211_RADIOTAP_CHANNEL) |
129 (1 << IEEE80211_RADIOTAP_ANTENNA) |
130 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
131 rthdr->it_len = cpu_to_le16(rtap_len);
132
133 pos = (unsigned char *)(rthdr+1);
134
135 /* the order of the following fields is important */
136
137 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 138 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 139 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 140 rthdr->it_present |=
141 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
142 pos += 8;
143 }
144
145 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 146 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 147 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 148 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
149 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 150 if (status->flag & RX_FLAG_SHORTPRE)
151 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 152 pos++;
153
154 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 155 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 156 /*
f8d1ccf1 157 * Without rate information don't add it. If we have,
38f37be2 158 * MCS information is a separate field in radiotap,
73b48099
JB		 159 * added below. The byte here is needed as padding
160 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 161 */
162 *pos = 0;
8d6f658e 163 } else {
ebe6c7ba 164 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 165 *pos = rate->bitrate / 5;
8d6f658e 166 }
601ae7f2
BR		 167 pos++;
168
169 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 170 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 171 pos += 2;
172 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 173 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
174 pos);
5f0b7de5
JB		 175 else if (status->flag & RX_FLAG_HT)
176 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
177 pos);
f8d1ccf1 178 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 179 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
180 pos);
f8d1ccf1 181 else if (rate)
6a86b9c7
JB		 182 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
183 pos);
f8d1ccf1
JB		 184 else
185 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 186 pos += 2;
187
188 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 189 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
190 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 191 *pos = status->signal;
192 rthdr->it_present |=
193 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
194 pos++;
195 }
196
601ae7f2
BR		 197 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
198
199 /* IEEE80211_RADIOTAP_ANTENNA */
200 *pos = status->antenna;
201 pos++;
202
601ae7f2
BR		 203 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
204
205 /* IEEE80211_RADIOTAP_RX_FLAGS */
206 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 207 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 208 pos++;
aae89831 209 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 210 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
211 put_unaligned_le16(rx_flags, pos);
601ae7f2 212 pos += 2;
6d744bac
JB		 213
214 if (status->flag & RX_FLAG_HT) {
215 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 216 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 217 *pos = 0;
218 if (status->flag & RX_FLAG_SHORT_GI)
219 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
220 if (status->flag & RX_FLAG_40MHZ)
221 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 222 if (status->flag & RX_FLAG_HT_GF)
223 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 224 pos++;
225 *pos++ = status->rate_idx;
226 }
4c298677
JB		 227
228 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
229 u16 flags = 0;
230
231 /* ensure 4 byte alignment */
232 while ((pos - (u8 *)rthdr) & 3)
233 pos++;
234 rthdr->it_present |=
235 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
236 put_unaligned_le32(status->ampdu_reference, pos);
237 pos += 4;
238 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
239 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
240 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
241 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
242 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
243 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
244 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
245 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
246 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
247 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
248 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
249 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
250 put_unaligned_le16(flags, pos);
251 pos += 2;
252 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
253 *pos++ = status->ampdu_delimiter_crc;
254 else
255 *pos++ = 0;
256 *pos++ = 0;
257 }
601ae7f2
BR		 258}
259
b2e7771e
JB		 260/*
261 * This function copies a received frame to all monitor interfaces and
262 * returns a cleaned-up SKB that no longer includes the FCS nor the
263 * radiotap header the driver might have added.
264 */
265static struct sk_buff *
266ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 267 struct ieee80211_rate *rate)
b2e7771e 268{
f1d58c25 269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 270 struct ieee80211_sub_if_data *sdata;
293702a3 271 int needed_headroom;
b2e7771e
JB		 272 struct sk_buff *skb, *skb2;
273 struct net_device *prev_dev = NULL;
274 int present_fcs_len = 0;
b2e7771e
JB		 275
276 /*
277 * First, we may need to make a copy of the skb because
278 * (1) we need to modify it for radiotap (if not present), and
279 * (2) the other RX handlers will modify the skb we got.
280 *
281 * We don't need to, of course, if we aren't going to return
282 * the SKB because it has a bad FCS/PLCP checksum.
283 */
0869aea0
JB		 284
285 /* room for the radiotap header based on driver features */
286 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 287
288 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
289 present_fcs_len = FCS_LEN;
290
e3cf8b3f
ZY		 291 /* make sure hdr->frame_control is on the linear part */
292 if (!pskb_may_pull(origskb, 2)) {
293 dev_kfree_skb(origskb);
294 return NULL;
295 }
296
b2e7771e 297 if (!local->monitors) {
0869aea0 298 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 299 dev_kfree_skb(origskb);
300 return NULL;
301 }
302
0869aea0 303 return remove_monitor_info(local, origskb);
b2e7771e
JB		 304 }
305
0869aea0 306 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 307 /* only need to expand headroom if necessary */
308 skb = origskb;
309 origskb = NULL;
310
311 /*
312 * This shouldn't trigger often because most devices have an
313 * RX header they pull before we get here, and that should
314 * be big enough for our radiotap information. We should
315 * probably export the length to drivers so that we can have
316 * them allocate enough headroom to start with.
317 */
318 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 319 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 320 dev_kfree_skb(skb);
321 return NULL;
322 }
323 } else {
324 /*
325 * Need to make a copy and possibly remove radiotap header
326 * and FCS from the original.
327 */
328 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
329
0869aea0 330 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 331
332 if (!skb)
333 return origskb;
334 }
335
0869aea0 336 /* prepend radiotap information */
973ef21a
FF		 337 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
338 true);
b2e7771e 339
ce3edf6d 340 skb_reset_mac_header(skb);
b2e7771e
JB		 341 skb->ip_summed = CHECKSUM_UNNECESSARY;
342 skb->pkt_type = PACKET_OTHERHOST;
343 skb->protocol = htons(ETH_P_802_2);
344
345 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 346 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 347 continue;
348
3d30d949
MW		 349 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
350 continue;
351
9607e6b6 352 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 353 continue;
354
b2e7771e
JB		 355 if (prev_dev) {
356 skb2 = skb_clone(skb, GFP_ATOMIC);
357 if (skb2) {
358 skb2->dev = prev_dev;
5548a8a1 359 netif_receive_skb(skb2);
b2e7771e
JB		 360 }
361 }
362
363 prev_dev = sdata->dev;
364 sdata->dev->stats.rx_packets++;
365 sdata->dev->stats.rx_bytes += skb->len;
366 }
367
368 if (prev_dev) {
369 skb->dev = prev_dev;
5548a8a1 370 netif_receive_skb(skb);
b2e7771e
JB		 371 } else
372 dev_kfree_skb(skb);
373
374 return origskb;
375}
376
377
5cf121c3 378static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 379{
238f74a2 380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 381 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 382 int tid, seqno_idx, security_idx;
6e0d114d
JB		 383
384 /* does the frame have a qos control field? */
238f74a2
HH		 385 if (ieee80211_is_data_qos(hdr->frame_control)) {
386 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 387 /* frame has qos control */
238f74a2 388 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 389 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 390 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 391
392 seqno_idx = tid;
393 security_idx = tid;
6e0d114d 394 } else {
1411f9b5
JB		 395 /*
396 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
397 *
398 * Sequence numbers for management frames, QoS data
399 * frames with a broadcast/multicast address in the
400 * Address 1 field, and all non-QoS data frames sent
401 * by QoS STAs are assigned using an additional single
402 * modulo-4096 counter, [...]
403 *
404 * We also use that counter for non-QoS STAs.
405 */
9e26297a
JB		 406 seqno_idx = NUM_RX_DATA_QUEUES;
407 security_idx = 0;
408 if (ieee80211_is_mgmt(hdr->frame_control))
409 security_idx = NUM_RX_DATA_QUEUES;
410 tid = 0;
6e0d114d 411 }
52865dfd 412
9e26297a
JB		 413 rx->seqno_idx = seqno_idx;
414 rx->security_idx = security_idx;
6e0d114d
JB		 415 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
416 * For now, set skb->priority to 0 for other cases. */
417 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 418}
6e0d114d 419
d1c3a37c
JB		 420/**
421 * DOC: Packet alignment
422 *
423 * Drivers always need to pass packets that are aligned to two-byte boundaries
424 * to the stack.
425 *
426 * Additionally, should, if possible, align the payload data in a way that
427 * guarantees that the contained IP header is aligned to a four-byte
428 * boundary. In the case of regular frames, this simply means aligning the
429 * payload to a four-byte boundary (because either the IP header is directly
430 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 431 * in front of it). If the payload data is not properly aligned and the
432 * architecture doesn't support efficient unaligned operations, mac80211
433 * will align the data.
d1c3a37c
JB		 434 *
435 * With A-MSDU frames, however, the payload data address must yield two modulo
436 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
437 * push the IP header further back to a multiple of four again. Thankfully, the
438 * specs were sane enough this time around to require padding each A-MSDU
439 * subframe to a length that is a multiple of four.
440 *
25985edc 441 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 442 * the payload is not supported, the driver is required to move the 802.11
443 * header to be directly in front of the payload in that case.
444 */
445static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 446{
59d9cb07
KV		 447#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
448 WARN_ONCE((unsigned long)rx->skb->data & 1,
449 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 450#endif
6e0d114d
JB		 451}
452
6368e4b1 453
571ecf67
JB		 454/* rx handlers */
455
3cfcf6ac
JM		 456static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
457{
458 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
459
460 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
461 return 0;
462
463 return ieee80211_is_robust_mgmt_frame(hdr);
464}
465
466
467static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
468{
469 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
470
471 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
472 return 0;
473
474 return ieee80211_is_robust_mgmt_frame(hdr);
475}
476
477
478/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
479static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
480{
481 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
482 struct ieee80211_mmie *mmie;
483
484 if (skb->len < 24 + sizeof(*mmie) ||
485 !is_multicast_ether_addr(hdr->da))
486 return -1;
487
488 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
489 return -1; /* not a robust management frame */
490
491 mmie = (struct ieee80211_mmie *)
492 (skb->data + skb->len - sizeof(*mmie));
493 if (mmie->element_id != WLAN_EID_MMIE ||
494 mmie->length != sizeof(*mmie) - 2)
495 return -1;
496
497 return le16_to_cpu(mmie->key_id);
498}
499
500
33b64eb2 501static ieee80211_rx_result
5cf121c3 502ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 503{
a7767f95 504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 505 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 506
a7767f95 507 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 508 if (is_multicast_ether_addr(hdr->addr1)) {
509 if (ieee80211_has_tods(hdr->frame_control) ||
510 !ieee80211_has_fromds(hdr->frame_control))
511 return RX_DROP_MONITOR;
b203ca39 512 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 513 return RX_DROP_MONITOR;
514 } else {
515 if (!ieee80211_has_a4(hdr->frame_control))
516 return RX_DROP_MONITOR;
b203ca39 517 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 518 return RX_DROP_MONITOR;
519 }
33b64eb2
LCC		 520 }
521
522 /* If there is not an established peer link and this is not a peer link
523 * establisment frame, beacon or probe, drop the frame.
524 */
525
57cf8043 526 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 527 struct ieee80211_mgmt *mgmt;
d6d1a5a7 528
a7767f95 529 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 530 return RX_DROP_MONITOR;
531
a7767f95 532 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 533 u8 category;
33b64eb2 534 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 535 category = mgmt->u.action.category;
536 if (category != WLAN_CATEGORY_MESH_ACTION &&
537 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 538 return RX_DROP_MONITOR;
33b64eb2 539 return RX_CONTINUE;
33b64eb2
LCC		 540 }
541
a7767f95
HH		 542 if (ieee80211_is_probe_req(hdr->frame_control) ||
543 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 544 ieee80211_is_beacon(hdr->frame_control) ||
545 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 546 return RX_CONTINUE;
547
548 return RX_DROP_MONITOR;
549
550 }
551
902acc78
JB		 552 return RX_CONTINUE;
553}
33b64eb2 554
1edfb1af
JB		 555#define SEQ_MODULO 0x1000
556#define SEQ_MASK 0xfff
557
558static inline int seq_less(u16 sq1, u16 sq2)
559{
560 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
561}
562
563static inline u16 seq_inc(u16 sq)
564{
565 return (sq + 1) & SEQ_MASK;
566}
567
568static inline u16 seq_sub(u16 sq1, u16 sq2)
569{
570 return (sq1 - sq2) & SEQ_MASK;
571}
572
573
d3b2fb53 574static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 575 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 576 int index)
1edfb1af 577{
d3b2fb53 578 struct ieee80211_local *local = sdata->local;
1edfb1af 579 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 580 struct ieee80211_rx_status *status;
1edfb1af 581
dd318575
JB		 582 lockdep_assert_held(&tid_agg_rx->reorder_lock);
583
1edfb1af
JB		 584 if (!skb)
585 goto no_frame;
586
071d9ac2 587 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 588 tid_agg_rx->stored_mpdu_num--;
589 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 590 status = IEEE80211_SKB_RXCB(skb);
591 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 592 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 593
594no_frame:
595 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
596}
597
d3b2fb53 598static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 599 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 600 u16 head_seq_num)
1edfb1af
JB		 601{
602 int index;
603
dd318575
JB		 604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
605
1edfb1af
JB		 606 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
d3b2fb53 609 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
1edfb1af
JB		 610 }
611}
612
613/*
614 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
615 * the skb was added to the buffer longer than this time ago, the earlier
616 * frames that have not yet been received are assumed to be lost and the skb
617 * can be released for processing. This may also release other skb's from the
618 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 619 *
620 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 621 */
622#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
623
d3b2fb53 624static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
24a8fdad 625 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 626{
2bff8ebf 627 int index, j;
aa0c8636 628
dd318575
JB		 629 lockdep_assert_held(&tid_agg_rx->reorder_lock);
630
aa0c8636
CL		 631 /* release the buffer until next missing frame */
632 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
633 tid_agg_rx->buf_size;
634 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 635 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 636 /*
637 * No buffers ready to be released, but check whether any
638 * frames in the reorder buffer have timed out.
639 */
aa0c8636
CL		 640 int skipped = 1;
641 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
642 j = (j + 1) % tid_agg_rx->buf_size) {
643 if (!tid_agg_rx->reorder_buf[j]) {
644 skipped++;
645 continue;
646 }
499fe9a4
DH		 647 if (skipped &&
648 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 649 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 650 goto set_release_timer;
aa0c8636 651
bdcbd8e0
JB		 652 ht_dbg_ratelimited(sdata,
653 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 654 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 655
656 /*
657 * Increment the head seq# also for the skipped slots.
658 */
659 tid_agg_rx->head_seq_num =
660 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
661 skipped = 0;
662 }
663 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 664 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 665 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
666 tid_agg_rx->buf_size;
667 }
2bff8ebf
CL		 668
669 if (tid_agg_rx->stored_mpdu_num) {
670 j = index = seq_sub(tid_agg_rx->head_seq_num,
671 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
672
673 for (; j != (index - 1) % tid_agg_rx->buf_size;
674 j = (j + 1) % tid_agg_rx->buf_size) {
675 if (tid_agg_rx->reorder_buf[j])
676 break;
677 }
678
679 set_release_timer:
680
681 mod_timer(&tid_agg_rx->reorder_timer,
334df731 682 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 683 HT_RX_REORDER_BUF_TIMEOUT);
684 } else {
685 del_timer(&tid_agg_rx->reorder_timer);
686 }
aa0c8636
CL		 687}
688
1edfb1af
JB		 689/*
690 * As this function belongs to the RX path it must be under
691 * rcu_read_lock protection. It returns false if the frame
692 * can be processed immediately, true if it was consumed.
693 */
d3b2fb53 694static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 695 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 696 struct sk_buff *skb)
1edfb1af
JB		 697{
698 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
699 u16 sc = le16_to_cpu(hdr->seq_ctrl);
700 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
701 u16 head_seq_num, buf_size;
702 int index;
2bff8ebf 703 bool ret = true;
1edfb1af 704
dd318575
JB		 705 spin_lock(&tid_agg_rx->reorder_lock);
706
1edfb1af
JB		 707 buf_size = tid_agg_rx->buf_size;
708 head_seq_num = tid_agg_rx->head_seq_num;
709
710 /* frame with out of date sequence number */
711 if (seq_less(mpdu_seq_num, head_seq_num)) {
712 dev_kfree_skb(skb);
2bff8ebf 713 goto out;
1edfb1af
JB		 714 }
715
716 /*
717 * If frame the sequence number exceeds our buffering window
718 * size release some previous frames to make room for this one.
719 */
720 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
721 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
722 /* release stored frames up to new head to stack */
d3b2fb53
JB		 723 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
724 head_seq_num);
1edfb1af
JB		 725 }
726
727 /* Now the new frame is always in the range of the reordering buffer */
728
729 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
730
731 /* check if we already stored this frame */
732 if (tid_agg_rx->reorder_buf[index]) {
733 dev_kfree_skb(skb);
2bff8ebf 734 goto out;
1edfb1af
JB		 735 }
736
737 /*
738 * If the current MPDU is in the right order and nothing else
739 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 740 * If it is first but there's something stored, we may be able
741 * to release frames after this one.
1edfb1af
JB		 742 */
743 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
744 tid_agg_rx->stored_mpdu_num == 0) {
745 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 746 ret = false;
747 goto out;
1edfb1af
JB		 748 }
749
750 /* put the frame in the reordering buffer */
751 tid_agg_rx->reorder_buf[index] = skb;
752 tid_agg_rx->reorder_time[index] = jiffies;
753 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 754 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 755
2bff8ebf
CL		 756 out:
757 spin_unlock(&tid_agg_rx->reorder_lock);
758 return ret;
1edfb1af
JB		 759}
760
761/*
762 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
763 * true if the MPDU was buffered, false if it should be processed.
764 */
24a8fdad 765static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 766{
2569a826
JB		 767 struct sk_buff *skb = rx->skb;
768 struct ieee80211_local *local = rx->local;
1edfb1af 769 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 770 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 771 struct sta_info *sta = rx->sta;
1edfb1af
JB		 772 struct tid_ampdu_rx *tid_agg_rx;
773 u16 sc;
6cc00d54 774 u8 tid, ack_policy;
1edfb1af
JB		 775
776 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 777 goto dont_reorder;
1edfb1af
JB		 778
779 /*
780 * filter the QoS data rx stream according to
781 * STA/TID and check if this STA/TID is on aggregation
782 */
783
1edfb1af 784 if (!sta)
2569a826 785 goto dont_reorder;
1edfb1af 786
6cc00d54
TP		 787 ack_policy = *ieee80211_get_qos_ctl(hdr) &
788 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 789 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
790
a87f736d
JB		 791 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
792 if (!tid_agg_rx)
793 goto dont_reorder;
1edfb1af
JB		 794
795 /* qos null data frames are excluded */
796 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 797 goto dont_reorder;
1edfb1af 798
6cc00d54
TP		 799 /* not part of a BA session */
800 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
801 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
802 goto dont_reorder;
803
660c6a44
TP		 804 /* not actually part of this BA session */
805 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
806 goto dont_reorder;
807
1edfb1af
JB		 808 /* new, potentially un-ordered, ampdu frame - process it */
809
810 /* reset session timer */
811 if (tid_agg_rx->timeout)
12d3952f 812 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 813
814 /* if this mpdu is fragmented - terminate rx aggregation session */
815 sc = le16_to_cpu(hdr->seq_ctrl);
816 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 817 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 818 skb_queue_tail(&rx->sdata->skb_queue, skb);
819 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 820 return;
1edfb1af
JB		 821 }
822
a87f736d
JB		 823 /*
824 * No locking needed -- we will only ever process one
825 * RX packet at a time, and thus own tid_agg_rx. All
826 * other code manipulating it needs to (and does) make
827 * sure that we cannot get to it any more before doing
828 * anything with it.
829 */
d3b2fb53 830 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 831 return;
832
833 dont_reorder:
24a8fdad 834 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 835}
33b64eb2 836
49461622 837static ieee80211_rx_result debug_noinline
5cf121c3 838ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 839{
a7767f95 840 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 841 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 842
843 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
844 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 845 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 846 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 847 hdr->seq_ctrl)) {
554891e6 848 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 849 rx->local->dot11FrameDuplicateCount++;
850 rx->sta->num_duplicates++;
851 }
b1f93314 852 return RX_DROP_UNUSABLE;
571ecf67 853 } else
9e26297a 854 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 855 }
856
571ecf67
JB		 857 if (unlikely(rx->skb->len < 16)) {
858 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 859 return RX_DROP_MONITOR;
571ecf67
JB		 860 }
861
571ecf67
JB		 862 /* Drop disallowed frame classes based on STA auth/assoc state;
863 * IEEE 802.11, Chap 5.5.
864 *
ccd7b362
JB		 865 * mac80211 filters only based on association state, i.e. it drops
866 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 867 * deauth/disassoc frames when needed. In addition, hostapd is
868 * responsible for filtering on both auth and assoc states.
869 */
33b64eb2 870
902acc78 871 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 872 return ieee80211_rx_mesh_check(rx);
33b64eb2 873
a7767f95
HH		 874 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
875 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 876 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 877 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 878 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 879 /*
880 * accept port control frames from the AP even when it's not
881 * yet marked ASSOC to prevent a race where we don't set the
882 * assoc bit quickly enough before it sends the first frame
883 */
884 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 885 ieee80211_is_data_present(hdr->frame_control)) {
886 u16 ethertype;
887 u8 *payload;
888
889 payload = rx->skb->data +
890 ieee80211_hdrlen(hdr->frame_control);
891 ethertype = (payload[6] << 8) | payload[7];
892 if (cpu_to_be16(ethertype) ==
893 rx->sdata->control_port_protocol)
894 return RX_CONTINUE;
895 }
21fc7560
JB		 896
897 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
898 cfg80211_rx_spurious_frame(rx->sdata->dev,
899 hdr->addr2,
900 GFP_ATOMIC))
901 return RX_DROP_UNUSABLE;
902
e4c26add 903 return RX_DROP_MONITOR;
2a33bee2 904 }
571ecf67 905
9ae54c84 906 return RX_CONTINUE;
570bd537
JB		 907}
908
909
49461622 910static ieee80211_rx_result debug_noinline
5cf121c3 911ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 912{
eb9fb5b8
JB		 913 struct sk_buff *skb = rx->skb;
914 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
915 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 916 int keyidx;
917 int hdrlen;
e4c26add 918 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 919 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 920 int mmie_keyidx = -1;
761ab470 921 __le16 fc;
570bd537 922
3017b80b
JB		 923 /*
924 * Key selection 101
925 *
3cfcf6ac 926 * There are four types of keys:
3017b80b 927 * - GTK (group keys)
3cfcf6ac 928 * - IGTK (group keys for management frames)
3017b80b
JB		 929 * - PTK (pairwise keys)
930 * - STK (station-to-station pairwise keys)
931 *
932 * When selecting a key, we have to distinguish between multicast
933 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 934 * use PTKs and STKs while the former always use GTKs and IGTKs.
935 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
936 * unicast frames can also use key indices like GTKs. Hence, if we
937 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 938 *
8dc06a1c
JB		 939 * Note that in a regular BSS, multicast frames are sent by the
940 * AP only, associated stations unicast the frame to the AP first
941 * which then multicasts it on their behalf.
942 *
3017b80b
JB		 943 * There is also a slight problem in IBSS mode: GTKs are negotiated
944 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 945 * The spec seems to expect that one negotiates the same key with
946 * every station but there's no such requirement; VLANs could be
947 * possible.
3017b80b
JB		 948 */
949
3017b80b 950 /*
1990af8d 951 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 952 * addressed to us nor a multicast frame.
953 */
554891e6 954 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 955 return RX_CONTINUE;
3017b80b 956
2569a826
JB		 957 /* start without a key */
958 rx->key = NULL;
959
d4e46a3d 960 if (rx->sta)
e31b8213 961 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 962
761ab470
JB		 963 fc = hdr->frame_control;
964
965 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 966 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
967
e31b8213
JB		 968 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
969 rx->key = sta_ptk;
dc1580dd
JB		 970 if ((status->flag & RX_FLAG_DECRYPTED) &&
971 (status->flag & RX_FLAG_IV_STRIPPED))
972 return RX_CONTINUE;
0c7c10c7 973 /* Skip decryption if the frame is not protected. */
761ab470 974 if (!ieee80211_has_protected(fc))
0c7c10c7 975 return RX_CONTINUE;
3cfcf6ac
JM		 976 } else if (mmie_keyidx >= 0) {
977 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 978 if ((status->flag & RX_FLAG_DECRYPTED) &&
979 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 980 return RX_CONTINUE;
981
982 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
983 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
984 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 985 if (rx->sta)
986 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
987 if (!rx->key)
988 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 989 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 990 /*
991 * The frame was not protected, so skip decryption. However, we
992 * need to set rx->key if there is a key that could have been
993 * used so that the frame may be dropped if encryption would
994 * have been expected.
995 */
996 struct ieee80211_key *key = NULL;
897bed8b
JB		 997 struct ieee80211_sub_if_data *sdata = rx->sdata;
998 int i;
999
761ab470 1000 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1001 is_multicast_ether_addr(hdr->addr1) &&
1002 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1003 rx->key = key;
897bed8b
JB		 1004 else {
1005 if (rx->sta) {
1006 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1007 key = rcu_dereference(rx->sta->gtk[i]);
1008 if (key)
1009 break;
1010 }
1011 }
1012 if (!key) {
1013 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1014 key = rcu_dereference(sdata->keys[i]);
1015 if (key)
1016 break;
1017 }
1018 }
1019 if (key)
1020 rx->key = key;
1021 }
0c7c10c7 1022 return RX_CONTINUE;
571ecf67 1023 } else {
39184b15 1024 u8 keyid;
3017b80b
JB		 1025 /*
1026 * The device doesn't give us the IV so we won't be
1027 * able to look up the key. That's ok though, we
1028 * don't need to decrypt the frame, we just won't
1029 * be able to keep statistics accurate.
1030 * Except for key threshold notifications, should
1031 * we somehow allow the driver to tell us which key
1032 * the hardware used if this flag is set?
1033 */
eb9fb5b8
JB		 1034 if ((status->flag & RX_FLAG_DECRYPTED) &&
1035 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1036 return RX_CONTINUE;
3017b80b 1037
761ab470 1038 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1039
1040 if (rx->skb->len < 8 + hdrlen)
e4c26add 1041 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1042
1043 /*
1044 * no need to call ieee80211_wep_get_keyidx,
1045 * it verifies a bunch of things we've done already
1046 */
39184b15
ZY		 1047 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1048 keyidx = keyid >> 6;
3017b80b 1049
e31b8213
JB		 1050 /* check per-station GTK first, if multicast packet */
1051 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1052 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1053
e31b8213
JB		 1054 /* if not found, try default key */
1055 if (!rx->key) {
1056 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1057
1058 /*
1059 * RSNA-protected unicast frames should always be
1060 * sent with pairwise or station-to-station keys,
1061 * but for WEP we allow using a key index as well.
1062 */
1063 if (rx->key &&
1064 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1065 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1066 !is_multicast_ether_addr(hdr->addr1))
1067 rx->key = NULL;
1068 }
571ecf67
JB		 1069 }
1070
3017b80b 1071 if (rx->key) {
95acac61
JB		 1072 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1073 return RX_DROP_MONITOR;
1074
571ecf67 1075 rx->key->tx_rx_count++;
011bfcc4 1076 /* TODO: add threshold stuff again */
1990af8d 1077 } else {
e4c26add 1078 return RX_DROP_MONITOR;
70f08765
JB		 1079 }
1080
97359d12
JB		 1081 switch (rx->key->conf.cipher) {
1082 case WLAN_CIPHER_SUITE_WEP40:
1083 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1084 result = ieee80211_crypto_wep_decrypt(rx);
1085 break;
97359d12 1086 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1087 result = ieee80211_crypto_tkip_decrypt(rx);
1088 break;
97359d12 1089 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1090 result = ieee80211_crypto_ccmp_decrypt(rx);
1091 break;
97359d12 1092 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1093 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1094 break;
3ffc2a90
JB		 1095 default:
1096 /*
1097 * We can reach here only with HW-only algorithms
1098 * but why didn't it decrypt the frame?!
1099 */
1100 return RX_DROP_UNUSABLE;
70f08765
JB		 1101 }
1102
a8286911
JB		 1103 /* the hdr variable is invalid after the decrypt handlers */
1104
e2f036da 1105 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1106 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1107
1108 return result;
70f08765
JB		 1109}
1110
572e0012
KV		 1111static ieee80211_rx_result debug_noinline
1112ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1113{
1114 struct ieee80211_local *local;
1115 struct ieee80211_hdr *hdr;
1116 struct sk_buff *skb;
1117
1118 local = rx->local;
1119 skb = rx->skb;
1120 hdr = (struct ieee80211_hdr *) skb->data;
1121
1122 if (!local->pspolling)
1123 return RX_CONTINUE;
1124
1125 if (!ieee80211_has_fromds(hdr->frame_control))
1126 /* this is not from AP */
1127 return RX_CONTINUE;
1128
1129 if (!ieee80211_is_data(hdr->frame_control))
1130 return RX_CONTINUE;
1131
1132 if (!ieee80211_has_moredata(hdr->frame_control)) {
1133 /* AP has no more frames buffered for us */
1134 local->pspolling = false;
1135 return RX_CONTINUE;
1136 }
1137
1138 /* more data bit is set, let's request a new frame from the AP */
1139 ieee80211_send_pspoll(local, rx->sdata);
1140
1141 return RX_CONTINUE;
1142}
1143
d012a605 1144static void sta_ps_start(struct sta_info *sta)
571ecf67 1145{
133b8226 1146 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1147 struct ieee80211_local *local = sdata->local;
d012a605 1148 struct ps_data *ps;
0795af57 1149
d012a605
MP		 1150 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1151 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1152 ps = &sdata->bss->ps;
1153 else
1154 return;
1155
1156 atomic_inc(&ps->num_sta_ps);
c2c98fde 1157 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1158 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1159 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1160 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1161 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1162}
1163
d012a605 1164static void sta_ps_end(struct sta_info *sta)
571ecf67 1165{
bdcbd8e0
JB		 1166 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1167 sta->sta.addr, sta->sta.aid);
004c872e 1168
c2c98fde 1169 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1170 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1171 sta->sta.addr, sta->sta.aid);
af818581
JB		 1172 return;
1173 }
1174
1175 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1176}
1177
d057e5a3
AN		 1178int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1179{
1180 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1181 bool in_ps;
1182
1183 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1184
1185 /* Don't let the same PS state be set twice */
c2c98fde 1186 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1187 if ((start && in_ps) || (!start && !in_ps))
1188 return -EINVAL;
1189
1190 if (start)
d012a605 1191 sta_ps_start(sta_inf);
d057e5a3 1192 else
d012a605 1193 sta_ps_end(sta_inf);
d057e5a3
AN		 1194
1195 return 0;
1196}
1197EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1198
47086fc5
JB		 1199static ieee80211_rx_result debug_noinline
1200ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1201{
1202 struct ieee80211_sub_if_data *sdata = rx->sdata;
1203 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1204 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1205 int tid, ac;
1206
1207 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1208 return RX_CONTINUE;
1209
1210 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1211 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1212 return RX_CONTINUE;
1213
1214 /*
1215 * The device handles station powersave, so don't do anything about
1216 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1217 * it to mac80211 since they're handled.)
1218 */
1219 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1220 return RX_CONTINUE;
1221
1222 /*
1223 * Don't do anything if the station isn't already asleep. In
1224 * the uAPSD case, the station will probably be marked asleep,
1225 * in the PS-Poll case the station must be confused ...
1226 */
c2c98fde 1227 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1228 return RX_CONTINUE;
1229
1230 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1231 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1232 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1233 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1234 else
c2c98fde 1235 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1236 }
47086fc5
JB		 1237
1238 /* Free PS Poll skb here instead of returning RX_DROP that would
1239 * count as an dropped frame. */
1240 dev_kfree_skb(rx->skb);
1241
1242 return RX_QUEUED;
1243 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1244 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1245 ieee80211_has_pm(hdr->frame_control) &&
1246 (ieee80211_is_data_qos(hdr->frame_control) ||
1247 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1248 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1249 ac = ieee802_1d_to_ac[tid & 7];
1250
1251 /*
1252 * If this AC is not trigger-enabled do nothing.
1253 *
1254 * NB: This could/should check a separate bitmap of trigger-
1255 * enabled queues, but for now we only implement uAPSD w/o
1256 * TSPEC changes to the ACs, so they're always the same.
1257 */
1258 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1259 return RX_CONTINUE;
1260
1261 /* if we are in a service period, do nothing */
c2c98fde 1262 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1263 return RX_CONTINUE;
1264
c2c98fde 1265 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1266 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1267 else
c2c98fde 1268 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1269 }
1270
1271 return RX_CONTINUE;
1272}
1273
49461622 1274static ieee80211_rx_result debug_noinline
5cf121c3 1275ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1276{
1277 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1278 struct sk_buff *skb = rx->skb;
1279 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1281
1282 if (!sta)
9ae54c84 1283 return RX_CONTINUE;
571ecf67 1284
b291ba11
JB		 1285 /*
1286 * Update last_rx only for IBSS packets which are for the current
1287 * BSSID to avoid keeping the current IBSS network alive in cases
1288 * where other STAs start using different BSSID.
1289 */
05c914fe 1290 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1291 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1292 NL80211_IFTYPE_ADHOC);
b203ca39 1293 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
571ecf67 1294 sta->last_rx = jiffies;
3af6334c
FF		 1295 if (ieee80211_is_data(hdr->frame_control)) {
1296 sta->last_rx_rate_idx = status->rate_idx;
1297 sta->last_rx_rate_flag = status->flag;
1298 }
1299 }
b291ba11
JB		 1300 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1301 /*
33b64eb2
LCC		 1302 * Mesh beacons will update last_rx when if they are found to
1303 * match the current local configuration when processed.
571ecf67 1304 */
b291ba11 1305 sta->last_rx = jiffies;
3af6334c
FF		 1306 if (ieee80211_is_data(hdr->frame_control)) {
1307 sta->last_rx_rate_idx = status->rate_idx;
1308 sta->last_rx_rate_flag = status->flag;
1309 }
571ecf67
JB		 1310 }
1311
554891e6 1312 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1313 return RX_CONTINUE;
571ecf67 1314
3cf335d5
KV		 1315 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1316 ieee80211_sta_rx_notify(rx->sdata, hdr);
1317
571ecf67
JB		 1318 sta->rx_fragments++;
1319 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1320 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1321 sta->last_signal = status->signal;
1322 ewma_add(&sta->avg_signal, -status->signal);
1323 }
571ecf67 1324
72eaa43a
JB		 1325 /*
1326 * Change STA power saving mode only at the end of a frame
1327 * exchange sequence.
1328 */
d057e5a3
AN		 1329 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1330 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1331 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1332 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1333 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1334 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1335 /*
1336 * Ignore doze->wake transitions that are
1337 * indicated by non-data frames, the standard
1338 * is unclear here, but for example going to
1339 * PS mode and then scanning would cause a
1340 * doze->wake transition for the probe request,
1341 * and that is clearly undesirable.
1342 */
1343 if (ieee80211_is_data(hdr->frame_control) &&
1344 !ieee80211_has_pm(hdr->frame_control))
d012a605 1345 sta_ps_end(sta);
72eaa43a
JB		 1346 } else {
1347 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1348 sta_ps_start(sta);
72eaa43a 1349 }
571ecf67
JB		 1350 }
1351
22403def
JB		 1352 /*
1353 * Drop (qos-)data::nullfunc frames silently, since they
1354 * are used only to control station power saving mode.
1355 */
1356 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1357 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1359
1360 /*
1361 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1362 * that was not moved to a 4-addr STA vlan yet send
1363 * the event to userspace and for older hostapd drop
1364 * the frame to the monitor interface.
d524215f
FF		 1365 */
1366 if (ieee80211_has_a4(hdr->frame_control) &&
1367 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1368 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1369 !rx->sdata->u.vlan.sta))) {
1370 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1371 cfg80211_rx_unexpected_4addr_frame(
1372 rx->sdata->dev, sta->sta.addr,
1373 GFP_ATOMIC);
d524215f 1374 return RX_DROP_MONITOR;
e7f4a940 1375 }
22403def
JB		 1376 /*
1377 * Update counter and free packet here to avoid
1378 * counting this as a dropped packed.
1379 */
571ecf67
JB		 1380 sta->rx_packets++;
1381 dev_kfree_skb(rx->skb);
9ae54c84 1382 return RX_QUEUED;
571ecf67
JB		 1383 }
1384
9ae54c84 1385 return RX_CONTINUE;
571ecf67
JB		 1386} /* ieee80211_rx_h_sta_process */
1387
571ecf67
JB		 1388static inline struct ieee80211_fragment_entry *
1389ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1390 unsigned int frag, unsigned int seq, int rx_queue,
1391 struct sk_buff **skb)
1392{
1393 struct ieee80211_fragment_entry *entry;
571ecf67 1394
571ecf67
JB		 1395 entry = &sdata->fragments[sdata->fragment_next++];
1396 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1397 sdata->fragment_next = 0;
1398
bdcbd8e0 1399 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1400 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1401
1402 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1403 *skb = NULL;
1404 entry->first_frag_time = jiffies;
1405 entry->seq = seq;
1406 entry->rx_queue = rx_queue;
1407 entry->last_frag = frag;
1408 entry->ccmp = 0;
1409 entry->extra_len = 0;
1410
1411 return entry;
1412}
1413
1414static inline struct ieee80211_fragment_entry *
1415ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1416 unsigned int frag, unsigned int seq,
571ecf67
JB		 1417 int rx_queue, struct ieee80211_hdr *hdr)
1418{
1419 struct ieee80211_fragment_entry *entry;
1420 int i, idx;
1421
1422 idx = sdata->fragment_next;
1423 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1424 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1425
1426 idx--;
1427 if (idx < 0)
1428 idx = IEEE80211_FRAGMENT_MAX - 1;
1429
1430 entry = &sdata->fragments[idx];
1431 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1432 entry->rx_queue != rx_queue ||
1433 entry->last_frag + 1 != frag)
1434 continue;
1435
b73d70ad 1436 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1437
b73d70ad
HH		 1438 /*
1439 * Check ftype and addresses are equal, else check next fragment
1440 */
1441 if (((hdr->frame_control ^ f_hdr->frame_control) &
1442 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1443 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1444 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1445 continue;
1446
ab46623e 1447 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1448 __skb_queue_purge(&entry->skb_list);
1449 continue;
1450 }
1451 return entry;
1452 }
1453
1454 return NULL;
1455}
1456
49461622 1457static ieee80211_rx_result debug_noinline
5cf121c3 1458ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1459{
1460 struct ieee80211_hdr *hdr;
1461 u16 sc;
358c8d9d 1462 __le16 fc;
571ecf67
JB		 1463 unsigned int frag, seq;
1464 struct ieee80211_fragment_entry *entry;
1465 struct sk_buff *skb;
554891e6 1466 struct ieee80211_rx_status *status;
571ecf67 1467
b73d70ad 1468 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1469 fc = hdr->frame_control;
571ecf67
JB		 1470 sc = le16_to_cpu(hdr->seq_ctrl);
1471 frag = sc & IEEE80211_SCTL_FRAG;
1472
358c8d9d 1473 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1474 (rx->skb)->len < 24 ||
1475 is_multicast_ether_addr(hdr->addr1))) {
1476 /* not fragmented */
1477 goto out;
1478 }
1479 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1480
e3cf8b3f
ZY		 1481 if (skb_linearize(rx->skb))
1482 return RX_DROP_UNUSABLE;
1483
058897a4
AK		 1484 /*
1485 * skb_linearize() might change the skb->data and
1486 * previously cached variables (in this case, hdr) need to
1487 * be refreshed with the new data.
1488 */
1489 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1490 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1491
1492 if (frag == 0) {
1493 /* This is the first fragment of a new frame. */
1494 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1495 rx->seqno_idx, &(rx->skb));
97359d12 1496 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1497 ieee80211_has_protected(fc)) {
9e26297a 1498 int queue = rx->security_idx;
571ecf67
JB		 1499 /* Store CCMP PN so that we can verify that the next
1500 * fragment has a sequential PN value. */
1501 entry->ccmp = 1;
1502 memcpy(entry->last_pn,
9190252c 1503 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1504 CCMP_PN_LEN);
1505 }
9ae54c84 1506 return RX_QUEUED;
571ecf67
JB		 1507 }
1508
1509 /* This is a fragment for a frame that should already be pending in
1510 * fragment cache. Add this fragment to the end of the pending entry.
1511 */
9e26297a
JB		 1512 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1513 rx->seqno_idx, hdr);
571ecf67
JB		 1514 if (!entry) {
1515 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1516 return RX_DROP_MONITOR;
571ecf67
JB		 1517 }
1518
1519 /* Verify that MPDUs within one MSDU have sequential PN values.
1520 * (IEEE 802.11i, 8.3.3.4.5) */
1521 if (entry->ccmp) {
1522 int i;
1523 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1524 int queue;
97359d12 1525 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1526 return RX_DROP_UNUSABLE;
571ecf67
JB		 1527 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1528 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1529 pn[i]++;
1530 if (pn[i])
1531 break;
1532 }
9e26297a 1533 queue = rx->security_idx;
9190252c 1534 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1535 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1536 return RX_DROP_UNUSABLE;
571ecf67
JB		 1537 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1538 }
1539
358c8d9d 1540 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1541 __skb_queue_tail(&entry->skb_list, rx->skb);
1542 entry->last_frag = frag;
1543 entry->extra_len += rx->skb->len;
358c8d9d 1544 if (ieee80211_has_morefrags(fc)) {
571ecf67 1545 rx->skb = NULL;
9ae54c84 1546 return RX_QUEUED;
571ecf67
JB		 1547 }
1548
1549 rx->skb = __skb_dequeue(&entry->skb_list);
1550 if (skb_tailroom(rx->skb) < entry->extra_len) {
1551 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1552 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1553 GFP_ATOMIC))) {
1554 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1555 __skb_queue_purge(&entry->skb_list);
e4c26add 1556 return RX_DROP_UNUSABLE;
571ecf67
JB		 1557 }
1558 }
1559 while ((skb = __skb_dequeue(&entry->skb_list))) {
1560 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1561 dev_kfree_skb(skb);
1562 }
1563
1564 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1565 status = IEEE80211_SKB_RXCB(rx->skb);
1566 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1567
1568 out:
1569 if (rx->sta)
1570 rx->sta->rx_packets++;
1571 if (is_multicast_ether_addr(hdr->addr1))
1572 rx->local->dot11MulticastReceivedFrameCount++;
1573 else
1574 ieee80211_led_rx(rx->local);
9ae54c84 1575 return RX_CONTINUE;
571ecf67
JB		 1576}
1577
76ee65bf 1578static int
5cf121c3 1579ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1580{
07346f81 1581 if (unlikely(!rx->sta ||
c2c98fde 1582 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1583 return -EACCES;
571ecf67 1584
76ee65bf 1585 return 0;
571ecf67
JB		 1586}
1587
76ee65bf 1588static int
358c8d9d 1589ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1590{
eb9fb5b8
JB		 1591 struct sk_buff *skb = rx->skb;
1592 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1593
3017b80b 1594 /*
7848ba7d
JB		 1595 * Pass through unencrypted frames if the hardware has
1596 * decrypted them already.
3017b80b 1597 */
eb9fb5b8 1598 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1599 return 0;
571ecf67
JB		 1600
1601 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1602 if (unlikely(!ieee80211_has_protected(fc) &&
1603 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1604 ieee80211_is_data(fc) &&
b3fc9c6c 1605 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1606 return -EACCES;
bef5d1c7
JB		 1607
1608 return 0;
1609}
1610
1611static int
1612ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1613{
1614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1615 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1616 __le16 fc = hdr->frame_control;
bef5d1c7 1617
e3efca0a
JM		 1618 /*
1619 * Pass through unencrypted frames if the hardware has
1620 * decrypted them already.
1621 */
1622 if (status->flag & RX_FLAG_DECRYPTED)
1623 return 0;
bef5d1c7 1624
c2c98fde 1625 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1626 if (unlikely(!ieee80211_has_protected(fc) &&
1627 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1628 rx->key)) {
1629 if (ieee80211_is_deauth(fc))
1630 cfg80211_send_unprot_deauth(rx->sdata->dev,
1631 rx->skb->data,
1632 rx->skb->len);
1633 else if (ieee80211_is_disassoc(fc))
1634 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1635 rx->skb->data,
1636 rx->skb->len);
f2ca3ea4 1637 return -EACCES;
cf4e594e 1638 }
f2ca3ea4 1639 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1640 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1641 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1642 if (ieee80211_is_deauth(fc))
1643 cfg80211_send_unprot_deauth(rx->sdata->dev,
1644 rx->skb->data,
1645 rx->skb->len);
1646 else if (ieee80211_is_disassoc(fc))
1647 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1648 rx->skb->data,
1649 rx->skb->len);
f2ca3ea4 1650 return -EACCES;
cf4e594e 1651 }
f2ca3ea4
JM		 1652 /*
1653 * When using MFP, Action frames are not allowed prior to
1654 * having configured keys.
1655 */
1656 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1657 ieee80211_is_robust_mgmt_frame(
1658 (struct ieee80211_hdr *) rx->skb->data)))
1659 return -EACCES;
1660 }
b3fc9c6c 1661
76ee65bf 1662 return 0;
571ecf67
JB		 1663}
1664
76ee65bf 1665static int
4114fa21 1666__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1667{
eb9fb5b8 1668 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1669 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1670 bool check_port_control = false;
1671 struct ethhdr *ehdr;
1672 int ret;
f14543ee 1673
4114fa21 1674 *port_control = false;
9bc383de
JB		 1675 if (ieee80211_has_a4(hdr->frame_control) &&
1676 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1677 return -1;
9bc383de 1678
fbb327c5
FF		 1679 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1680 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1681
1682 if (!sdata->u.mgd.use_4addr)
1683 return -1;
1684 else
1685 check_port_control = true;
1686 }
1687
9bc383de 1688 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1689 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1690 return -1;
571ecf67 1691
fbb327c5 1692 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1693 if (ret < 0)
fbb327c5
FF		 1694 return ret;
1695
1696 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1697 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1698 *port_control = true;
1699 else if (check_port_control)
fbb327c5
FF		 1700 return -1;
1701
1702 return 0;
76ee65bf 1703}
571ecf67 1704
ce3edf6d
JB		 1705/*
1706 * requires that rx->skb is a frame with ethernet header
1707 */
358c8d9d 1708static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1709{
c97c23e3 1710 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1711 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1712 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1713
1714 /*
1715 * Allow EAPOL frames to us/the PAE group address regardless
1716 * of whether the frame was encrypted or not.
1717 */
a621fa4d 1718 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1719 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1720 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1721 return true;
1722
1723 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1724 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1725 return false;
1726
1727 return true;
1728}
1729
1730/*
1731 * requires that rx->skb is a frame with ethernet header
1732 */
76ee65bf 1733static void
5cf121c3 1734ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1735{
eb9fb5b8
JB		 1736 struct ieee80211_sub_if_data *sdata = rx->sdata;
1737 struct net_device *dev = sdata->dev;
76ee65bf 1738 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1739 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1740 struct sta_info *dsta;
554891e6 1741 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1742
76ee65bf
RR		 1743 skb = rx->skb;
1744 xmit_skb = NULL;
571ecf67 1745
05c914fe
JB		 1746 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1747 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1748 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1749 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1750 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1751 if (is_multicast_ether_addr(ehdr->h_dest)) {
1752 /*
1753 * send multicast frames both to higher layers in
1754 * local net stack and back to the wireless medium
1755 */
76ee65bf 1756 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1757 if (!xmit_skb)
bdcbd8e0 1758 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1759 dev->name);
571ecf67 1760 } else {
abe60632
JB		 1761 dsta = sta_info_get(sdata, skb->data);
1762 if (dsta) {
ce3edf6d
JB		 1763 /*
1764 * The destination station is associated to
1765 * this AP (in this VLAN), so send the frame
1766 * directly to it and do not pass it to local
1767 * net stack.
571ecf67 1768 */
76ee65bf 1769 xmit_skb = skb;
571ecf67
JB		 1770 skb = NULL;
1771 }
571ecf67
JB		 1772 }
1773 }
1774
1775 if (skb) {
d1c3a37c
JB		 1776 int align __maybe_unused;
1777
59d9cb07 1778#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1779 /*
1780 * 'align' will only take the values 0 or 2 here
1781 * since all frames are required to be aligned
1782 * to 2-byte boundaries when being passed to
1783 * mac80211. That also explains the __skb_push()
1784 * below.
1785 */
dacb6f1d 1786 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1787 if (align) {
1788 if (WARN_ON(skb_headroom(skb) < 3)) {
1789 dev_kfree_skb(skb);
1790 skb = NULL;
1791 } else {
1792 u8 *data = skb->data;
8ce0b589
ZY		 1793 size_t len = skb_headlen(skb);
1794 skb->data -= align;
1795 memmove(skb->data, data, len);
1796 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1797 }
1798 }
1799#endif
1800
1801 if (skb) {
1802 /* deliver to local stack */
1803 skb->protocol = eth_type_trans(skb, dev);
1804 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1805 netif_receive_skb(skb);
d1c3a37c 1806 }
571ecf67
JB		 1807 }
1808
76ee65bf 1809 if (xmit_skb) {
aef6c928
HS		 1810 /*
1811 * Send to wireless media and increase priority by 256 to
1812 * keep the received priority instead of reclassifying
1813 * the frame (see cfg80211_classify8021d).
1814 */
1815 xmit_skb->priority += 256;
f831e909 1816 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1817 skb_reset_network_header(xmit_skb);
1818 skb_reset_mac_header(xmit_skb);
76ee65bf 1819 dev_queue_xmit(xmit_skb);
571ecf67 1820 }
76ee65bf
RR		 1821}
1822
49461622 1823static ieee80211_rx_result debug_noinline
5cf121c3 1824ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1825{
eb9fb5b8 1826 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1827 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1828 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1829 __le16 fc = hdr->frame_control;
eaf85ca7 1830 struct sk_buff_head frame_list;
554891e6 1831 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1832
358c8d9d 1833 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1834 return RX_CONTINUE;
fd4c7f2f 1835
358c8d9d 1836 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1837 return RX_DROP_MONITOR;
fd4c7f2f 1838
554891e6 1839 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1840 return RX_CONTINUE;
fd4c7f2f 1841
eaf85ca7
ZY		 1842 if (ieee80211_has_a4(hdr->frame_control) &&
1843 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1844 !rx->sdata->u.vlan.sta)
e4c26add 1845 return RX_DROP_UNUSABLE;
fd4c7f2f 1846
eaf85ca7
ZY		 1847 if (is_multicast_ether_addr(hdr->addr1) &&
1848 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1849 rx->sdata->u.vlan.sta) ||
1850 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1851 rx->sdata->u.mgd.use_4addr)))
e4c26add 1852 return RX_DROP_UNUSABLE;
fd4c7f2f 1853
eaf85ca7
ZY		 1854 skb->dev = dev;
1855 __skb_queue_head_init(&frame_list);
fd4c7f2f 1856
e3cf8b3f
ZY		 1857 if (skb_linearize(skb))
1858 return RX_DROP_UNUSABLE;
1859
eaf85ca7
ZY		 1860 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1861 rx->sdata->vif.type,
8b3becad 1862 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1863
eaf85ca7
ZY		 1864 while (!skb_queue_empty(&frame_list)) {
1865 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1866
358c8d9d 1867 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1868 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1869 continue;
1870 }
eaf85ca7
ZY		 1871 dev->stats.rx_packets++;
1872 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1873
1874 ieee80211_deliver_skb(rx);
1875 }
1876
9ae54c84 1877 return RX_QUEUED;
fd4c7f2f
RR		 1878}
1879
bf94e17b 1880#ifdef CONFIG_MAC80211_MESH
b0dee578 1881static ieee80211_rx_result
e32f85f7
LCC		 1882ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1883{
30789eb6
TP		 1884 struct ieee80211_hdr *fwd_hdr, *hdr;
1885 struct ieee80211_tx_info *info;
e32f85f7 1886 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1887 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1888 struct ieee80211_local *local = rx->local;
eb9fb5b8 1889 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1890 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1891 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1892 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1893 u16 q, hdrlen;
e32f85f7
LCC		 1894
1895 hdr = (struct ieee80211_hdr *) skb->data;
1896 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1897 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1898
2157fdd6
TP		 1899 /* frame is in RMC, don't forward */
1900 if (ieee80211_is_data(hdr->frame_control) &&
1901 is_multicast_ether_addr(hdr->addr1) &&
1902 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1903 return RX_DROP_MONITOR;
1904
e32f85f7
LCC		 1905 if (!ieee80211_is_data(hdr->frame_control))
1906 return RX_CONTINUE;
1907
1908 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1909 return RX_DROP_MONITOR;
1910
43b7b314 1911 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1912 struct mesh_path *mppath;
43b7b314
JC		 1913 char *proxied_addr;
1914 char *mpp_addr;
1915
1916 if (is_multicast_ether_addr(hdr->addr1)) {
1917 mpp_addr = hdr->addr3;
1918 proxied_addr = mesh_hdr->eaddr1;
1919 } else {
1920 mpp_addr = hdr->addr4;
1921 proxied_addr = mesh_hdr->eaddr2;
1922 }
79617dee 1923
79617dee 1924 rcu_read_lock();
43b7b314 1925 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1926 if (!mppath) {
43b7b314 1927 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1928 } else {
1929 spin_lock_bh(&mppath->state_lock);
b203ca39 1930 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 1931 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1932 spin_unlock_bh(&mppath->state_lock);
1933 }
1934 rcu_read_unlock();
1935 }
1936
3c5772a5
JC		 1937 /* Frame has reached destination. Don't forward */
1938 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 1939 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 1940 return RX_CONTINUE;
1941
00e96dec 1942 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 1943 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1944 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1945 return RX_DROP_MONITOR;
1946 }
1947 skb_set_queue_mapping(skb, q);
e32f85f7 1948
30789eb6
TP		 1949 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1950 goto out;
c8a61a7d 1951
30789eb6
TP		 1952 if (!--mesh_hdr->ttl) {
1953 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1954 return RX_DROP_MONITOR;
1955 }
1956
d665508b
CYY		 1957 if (!ifmsh->mshcfg.dot11MeshForwarding)
1958 goto out;
1959
30789eb6
TP		 1960 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1961 if (!fwd_skb) {
bdcbd8e0 1962 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 1963 sdata->name);
30789eb6
TP		 1964 goto out;
1965 }
1966
1967 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1968 info = IEEE80211_SKB_CB(fwd_skb);
1969 memset(info, 0, sizeof(*info));
1970 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1971 info->control.vif = &rx->sdata->vif;
1972 info->control.jiffies = jiffies;
1973 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1974 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1975 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1976 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1978 } else {
1979 /* unable to resolve next hop */
1980 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1981 0, reason, fwd_hdr->addr2, sdata);
1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1983 kfree_skb(fwd_skb);
30789eb6 1984 return RX_DROP_MONITOR;
e32f85f7
LCC		 1985 }
1986
30789eb6
TP		 1987 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1988 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1989 out:
3c5772a5 1990 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1991 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1992 return RX_CONTINUE;
1993 else
1994 return RX_DROP_MONITOR;
1995}
bf94e17b 1996#endif
e32f85f7 1997
49461622 1998static ieee80211_rx_result debug_noinline
5cf121c3 1999ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2000{
eb9fb5b8 2001 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2002 struct ieee80211_local *local = rx->local;
eb9fb5b8 2003 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2004 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2005 __le16 fc = hdr->frame_control;
4114fa21 2006 bool port_control;
ce3edf6d 2007 int err;
76ee65bf 2008
358c8d9d 2009 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2010 return RX_CONTINUE;
76ee65bf 2011
358c8d9d 2012 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2013 return RX_DROP_MONITOR;
76ee65bf 2014
f14543ee 2015 /*
e7f4a940
JB		 2016 * Send unexpected-4addr-frame event to hostapd. For older versions,
2017 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2018 */
2019 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2020 sdata->vif.type == NL80211_IFTYPE_AP) {
2021 if (rx->sta &&
2022 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2023 cfg80211_rx_unexpected_4addr_frame(
2024 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2025 return RX_DROP_MONITOR;
e7f4a940 2026 }
f14543ee 2027
4114fa21 2028 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2029 if (unlikely(err))
e4c26add 2030 return RX_DROP_UNUSABLE;
76ee65bf 2031
358c8d9d 2032 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2033 return RX_DROP_MONITOR;
ce3edf6d 2034
4114fa21
FF		 2035 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2036 unlikely(port_control) && sdata->bss) {
2037 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2038 u.ap);
2039 dev = sdata->dev;
2040 rx->sdata = sdata;
2041 }
2042
76ee65bf
RR		 2043 rx->skb->dev = dev;
2044
2045 dev->stats.rx_packets++;
2046 dev->stats.rx_bytes += rx->skb->len;
2047
08ca944e 2048 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2049 !is_multicast_ether_addr(
2050 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2051 (!local->scanning &&
2052 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2053 mod_timer(&local->dynamic_ps_timer, jiffies +
2054 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2055 }
2056
76ee65bf 2057 ieee80211_deliver_skb(rx);
571ecf67 2058
9ae54c84 2059 return RX_QUEUED;
571ecf67
JB		 2060}
2061
49461622 2062static ieee80211_rx_result debug_noinline
24a8fdad 2063ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2064{
71364716 2065 struct sk_buff *skb = rx->skb;
a7767f95 2066 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2067 struct tid_ampdu_rx *tid_agg_rx;
2068 u16 start_seq_num;
2069 u16 tid;
2070
a7767f95 2071 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2072 return RX_CONTINUE;
71364716 2073
a7767f95 2074 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2075 struct {
2076 __le16 control, start_seq_num;
2077 } __packed bar_data;
2078
71364716 2079 if (!rx->sta)
a02ae758 2080 return RX_DROP_MONITOR;
8ae5977f
JB		 2081
2082 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2083 &bar_data, sizeof(bar_data)))
2084 return RX_DROP_MONITOR;
2085
8ae5977f 2086 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2087
2088 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2089 if (!tid_agg_rx)
a02ae758 2090 return RX_DROP_MONITOR;
71364716 2091
8ae5977f 2092 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2093
2094 /* reset session timer */
20ad19d0
JB		 2095 if (tid_agg_rx->timeout)
2096 mod_timer(&tid_agg_rx->session_timer,
2097 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2098
dd318575 2099 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2100 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2101 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2102 start_seq_num);
dd318575
JB		 2103 spin_unlock(&tid_agg_rx->reorder_lock);
2104
a02ae758
JB		 2105 kfree_skb(skb);
2106 return RX_QUEUED;
71364716
RR		 2107 }
2108
08daecae
JB		 2109 /*
2110 * After this point, we only want management frames,
2111 * so we can drop all remaining control frames to
2112 * cooked monitor interfaces.
2113 */
2114 return RX_DROP_MONITOR;
71364716
RR		 2115}
2116
f4f727a6
JM		 2117static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2118 struct ieee80211_mgmt *mgmt,
2119 size_t len)
fea14732
JM		 2120{
2121 struct ieee80211_local *local = sdata->local;
2122 struct sk_buff *skb;
2123 struct ieee80211_mgmt *resp;
2124
b203ca39 2125 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2126 /* Not to own unicast address */
2127 return;
2128 }
2129
b203ca39
JP		 2130 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2131 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2132 /* Not from the current AP or not associated yet. */
fea14732
JM		 2133 return;
2134 }
2135
2136 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2137 /* Too short SA Query request frame */
2138 return;
2139 }
2140
2141 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2142 if (skb == NULL)
2143 return;
2144
2145 skb_reserve(skb, local->hw.extra_tx_headroom);
2146 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2147 memset(resp, 0, 24);
2148 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2149 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2150 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2151 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2152 IEEE80211_STYPE_ACTION);
2153 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2154 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2155 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2156 memcpy(resp->u.action.u.sa_query.trans_id,
2157 mgmt->u.action.u.sa_query.trans_id,
2158 WLAN_SA_QUERY_TR_ID_LEN);
2159
62ae67be 2160 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2161}
2162
2e161f78
JB		 2163static ieee80211_rx_result debug_noinline
2164ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2165{
2166 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2167 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2168
2169 /*
2170 * From here on, look only at management frames.
2171 * Data and control frames are already handled,
2172 * and unknown (reserved) frames are useless.
2173 */
2174 if (rx->skb->len < 24)
2175 return RX_DROP_MONITOR;
2176
2177 if (!ieee80211_is_mgmt(mgmt->frame_control))
2178 return RX_DROP_MONITOR;
2179
ee971924
JB		 2180 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2181 ieee80211_is_beacon(mgmt->frame_control) &&
2182 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2183 int sig = 0;
2184
2185 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2186 sig = status->signal;
2187
ee971924
JB		 2188 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2189 rx->skb->data, rx->skb->len,
804483e9 2190 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2191 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2192 }
2193
554891e6 2194 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2195 return RX_DROP_MONITOR;
2196
2197 if (ieee80211_drop_unencrypted_mgmt(rx))
2198 return RX_DROP_UNUSABLE;
2199
2200 return RX_CONTINUE;
2201}
2202
de1ede7a
JB		 2203static ieee80211_rx_result debug_noinline
2204ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2205{
2206 struct ieee80211_local *local = rx->local;
eb9fb5b8 2207 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2208 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2209 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2210 int len = rx->skb->len;
2211
2212 if (!ieee80211_is_action(mgmt->frame_control))
2213 return RX_CONTINUE;
2214
026331c4
JM		 2215 /* drop too small frames */
2216 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2217 return RX_DROP_UNUSABLE;
de1ede7a 2218
026331c4 2219 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2220 return RX_DROP_UNUSABLE;
de1ede7a 2221
554891e6 2222 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2223 return RX_DROP_UNUSABLE;
97ebe12a 2224
de1ede7a 2225 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2226 case WLAN_CATEGORY_HT:
2227 /* reject HT action frames from stations not supporting HT */
2228 if (!rx->sta->sta.ht_cap.ht_supported)
2229 goto invalid;
2230
2231 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2232 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2233 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2234 sdata->vif.type != NL80211_IFTYPE_AP &&
2235 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2236 break;
2237
2238 /* verify action & smps_control are present */
2239 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2240 goto invalid;
2241
2242 switch (mgmt->u.action.u.ht_smps.action) {
2243 case WLAN_HT_ACTION_SMPS: {
2244 struct ieee80211_supported_band *sband;
2245 u8 smps;
2246
2247 /* convert to HT capability */
2248 switch (mgmt->u.action.u.ht_smps.smps_control) {
2249 case WLAN_HT_SMPS_CONTROL_DISABLED:
2250 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2251 break;
2252 case WLAN_HT_SMPS_CONTROL_STATIC:
2253 smps = WLAN_HT_CAP_SM_PS_STATIC;
2254 break;
2255 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2256 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2257 break;
2258 default:
2259 goto invalid;
2260 }
2261 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2262
2263 /* if no change do nothing */
2264 if ((rx->sta->sta.ht_cap.cap &
2265 IEEE80211_HT_CAP_SM_PS) == smps)
2266 goto handled;
2267
2268 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2269 rx->sta->sta.ht_cap.cap |= smps;
2270
2271 sband = rx->local->hw.wiphy->bands[status->band];
2272
64f68e5d
JB		 2273 rate_control_rate_update(local, sband, rx->sta,
2274 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2275 goto handled;
2276 }
2277 default:
2278 goto invalid;
2279 }
2280
2281 break;
de1ede7a 2282 case WLAN_CATEGORY_BACK:
8abd3f9b 2283 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2284 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2285 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2286 sdata->vif.type != NL80211_IFTYPE_AP &&
2287 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2288 break;
8abd3f9b 2289
026331c4
JM		 2290 /* verify action_code is present */
2291 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2292 break;
2293
de1ede7a
JB		 2294 switch (mgmt->u.action.u.addba_req.action_code) {
2295 case WLAN_ACTION_ADDBA_REQ:
2296 if (len < (IEEE80211_MIN_ACTION_SIZE +
2297 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2298 goto invalid;
2299 break;
de1ede7a
JB		 2300 case WLAN_ACTION_ADDBA_RESP:
2301 if (len < (IEEE80211_MIN_ACTION_SIZE +
2302 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2303 goto invalid;
2304 break;
de1ede7a
JB		 2305 case WLAN_ACTION_DELBA:
2306 if (len < (IEEE80211_MIN_ACTION_SIZE +
2307 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2308 goto invalid;
2309 break;
2310 default:
2311 goto invalid;
de1ede7a 2312 }
bed7ee6e 2313
8b58ff83 2314 goto queue;
39192c0b 2315 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2316 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2317 break;
46900298
JB		 2318
2319 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2320 break;
46900298 2321
026331c4
JM		 2322 /* verify action_code is present */
2323 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2324 break;
2325
39192c0b
JB		 2326 switch (mgmt->u.action.u.measurement.action_code) {
2327 case WLAN_ACTION_SPCT_MSR_REQ:
2328 if (len < (IEEE80211_MIN_ACTION_SIZE +
2329 sizeof(mgmt->u.action.u.measurement)))
84040805 2330 break;
39192c0b 2331 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2332 goto handled;
c481ec97
S		 2333 case WLAN_ACTION_SPCT_CHL_SWITCH:
2334 if (len < (IEEE80211_MIN_ACTION_SIZE +
2335 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2336 break;
c481ec97 2337
cc32abd4 2338 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2339 break;
cc32abd4 2340
b203ca39 2341 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2342 break;
c481ec97 2343
8b58ff83 2344 goto queue;
39192c0b
JB		 2345 }
2346 break;
fea14732
JM		 2347 case WLAN_CATEGORY_SA_QUERY:
2348 if (len < (IEEE80211_MIN_ACTION_SIZE +
2349 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2350 break;
2351
fea14732
JM		 2352 switch (mgmt->u.action.u.sa_query.action) {
2353 case WLAN_ACTION_SA_QUERY_REQUEST:
2354 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2355 break;
fea14732 2356 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2357 goto handled;
fea14732
JM		 2358 }
2359 break;
8db09850
TP		 2360 case WLAN_CATEGORY_SELF_PROTECTED:
2361 switch (mgmt->u.action.u.self_prot.action_code) {
2362 case WLAN_SP_MESH_PEERING_OPEN:
2363 case WLAN_SP_MESH_PEERING_CLOSE:
2364 case WLAN_SP_MESH_PEERING_CONFIRM:
2365 if (!ieee80211_vif_is_mesh(&sdata->vif))
2366 goto invalid;
2367 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2368 /* userspace handles this frame */
2369 break;
2370 goto queue;
2371 case WLAN_SP_MGK_INFORM:
2372 case WLAN_SP_MGK_ACK:
2373 if (!ieee80211_vif_is_mesh(&sdata->vif))
2374 goto invalid;
2375 break;
2376 }
2377 break;
d3aaec8a 2378 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2379 if (!ieee80211_vif_is_mesh(&sdata->vif))
2380 break;
25d49e4d
TP		 2381 if (mesh_action_is_path_sel(mgmt) &&
2382 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2383 break;
2384 goto queue;
84040805 2385 }
026331c4 2386
2e161f78
JB		 2387 return RX_CONTINUE;
2388
bed7ee6e 2389 invalid:
554891e6 2390 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2391 /* will return in the next handlers */
2392 return RX_CONTINUE;
2393
2394 handled:
2395 if (rx->sta)
2396 rx->sta->rx_packets++;
2397 dev_kfree_skb(rx->skb);
2398 return RX_QUEUED;
2399
2400 queue:
2401 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2402 skb_queue_tail(&sdata->skb_queue, rx->skb);
2403 ieee80211_queue_work(&local->hw, &sdata->work);
2404 if (rx->sta)
2405 rx->sta->rx_packets++;
2406 return RX_QUEUED;
2407}
2408
2409static ieee80211_rx_result debug_noinline
2410ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2411{
554891e6 2412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2413 int sig = 0;
2e161f78
JB		 2414
2415 /* skip known-bad action frames and return them in the next handler */
554891e6 2416 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2417 return RX_CONTINUE;
d7907448 2418
026331c4
JM		 2419 /*
2420 * Getting here means the kernel doesn't know how to handle
2421 * it, but maybe userspace does ... include returned frames
2422 * so userspace can register for those to know whether ones
2423 * it transmitted were processed or returned.
2424 */
026331c4 2425
804483e9
JB		 2426 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2427 sig = status->signal;
2428
71bbc994 2429 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2430 rx->skb->data, rx->skb->len,
2431 GFP_ATOMIC)) {
2432 if (rx->sta)
2433 rx->sta->rx_packets++;
2434 dev_kfree_skb(rx->skb);
2435 return RX_QUEUED;
2436 }
2437
2438
2439 return RX_CONTINUE;
2440}
2441
2442static ieee80211_rx_result debug_noinline
2443ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2444{
2445 struct ieee80211_local *local = rx->local;
2446 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2447 struct sk_buff *nskb;
2448 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2449 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2450
2451 if (!ieee80211_is_action(mgmt->frame_control))
2452 return RX_CONTINUE;
2453
2454 /*
2455 * For AP mode, hostapd is responsible for handling any action
2456 * frames that we didn't handle, including returning unknown
2457 * ones. For all other modes we will return them to the sender,
2458 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2459 * 802.11-2012 9.24.4.
2e161f78
JB		 2460 * Newer versions of hostapd shall also use the management frame
2461 * registration mechanisms, but older ones still use cooked
2462 * monitor interfaces so push all frames there.
2463 */
554891e6 2464 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2465 (sdata->vif.type == NL80211_IFTYPE_AP ||
2466 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2467 return RX_DROP_MONITOR;
026331c4 2468
4b5ebccc
JB		 2469 if (is_multicast_ether_addr(mgmt->da))
2470 return RX_DROP_MONITOR;
2471
84040805
JB		 2472 /* do not return rejected action frames */
2473 if (mgmt->u.action.category & 0x80)
2474 return RX_DROP_UNUSABLE;
2475
2476 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2477 GFP_ATOMIC);
2478 if (nskb) {
292b4df6 2479 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2480
292b4df6
JL		 2481 nmgmt->u.action.category |= 0x80;
2482 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2483 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2484
2485 memset(nskb->cb, 0, sizeof(nskb->cb));
2486
2487 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2488 }
39192c0b
JB		 2489 dev_kfree_skb(rx->skb);
2490 return RX_QUEUED;
de1ede7a
JB		 2491}
2492
49461622 2493static ieee80211_rx_result debug_noinline
5cf121c3 2494ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2495{
eb9fb5b8 2496 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2497 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2498 __le16 stype;
571ecf67 2499
77a121c3 2500 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2501
77a121c3
JB		 2502 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2503 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2504 sdata->vif.type != NL80211_IFTYPE_STATION)
2505 return RX_DROP_MONITOR;
472dbc45 2506
77a121c3 2507 switch (stype) {
66e67e41 2508 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2509 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2510 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2511 /* process for all: mesh, mlme, ibss */
2512 break;
66e67e41
JB		 2513 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2514 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2515 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2516 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2517 if (is_multicast_ether_addr(mgmt->da) &&
2518 !is_broadcast_ether_addr(mgmt->da))
2519 return RX_DROP_MONITOR;
2520
77a121c3
JB		 2521 /* process only for station */
2522 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2523 return RX_DROP_MONITOR;
2524 break;
2525 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2526 /* process only for ibss */
2527 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2528 return RX_DROP_MONITOR;
2529 break;
2530 default:
2531 return RX_DROP_MONITOR;
2532 }
f9d540ee 2533
77a121c3 2534 /* queue up frame and kick off work to process it */
c1475ca9 2535 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2536 skb_queue_tail(&sdata->skb_queue, rx->skb);
2537 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2538 if (rx->sta)
2539 rx->sta->rx_packets++;
46900298 2540
77a121c3 2541 return RX_QUEUED;
571ecf67
JB		 2542}
2543
5cf121c3 2544/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2545static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2546 struct ieee80211_rate *rate)
3d30d949
MW		 2547{
2548 struct ieee80211_sub_if_data *sdata;
2549 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2550 struct sk_buff *skb = rx->skb, *skb2;
2551 struct net_device *prev_dev = NULL;
eb9fb5b8 2552 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2553 int needed_headroom;
3d30d949 2554
554891e6
JB		 2555 /*
2556 * If cooked monitor has been processed already, then
2557 * don't do it again. If not, set the flag.
2558 */
2559 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2560 goto out_free_skb;
554891e6 2561 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2562
152c477a
JB		 2563 /* If there are no cooked monitor interfaces, just free the SKB */
2564 if (!local->cooked_mntrs)
2565 goto out_free_skb;
2566
293702a3
JB		 2567 /* room for the radiotap header based on driver features */
2568 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2569
293702a3
JB		 2570 if (skb_headroom(skb) < needed_headroom &&
2571 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2572 goto out_free_skb;
3d30d949 2573
293702a3 2574 /* prepend radiotap information */
973ef21a
FF		 2575 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2576 false);
3d30d949
MW		 2577
2578 skb_set_mac_header(skb, 0);
2579 skb->ip_summed = CHECKSUM_UNNECESSARY;
2580 skb->pkt_type = PACKET_OTHERHOST;
2581 skb->protocol = htons(ETH_P_802_2);
2582
2583 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2584 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2585 continue;
2586
05c914fe 2587 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2588 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2589 continue;
2590
2591 if (prev_dev) {
2592 skb2 = skb_clone(skb, GFP_ATOMIC);
2593 if (skb2) {
2594 skb2->dev = prev_dev;
5548a8a1 2595 netif_receive_skb(skb2);
3d30d949
MW		 2596 }
2597 }
2598
2599 prev_dev = sdata->dev;
2600 sdata->dev->stats.rx_packets++;
2601 sdata->dev->stats.rx_bytes += skb->len;
2602 }
2603
2604 if (prev_dev) {
2605 skb->dev = prev_dev;
5548a8a1 2606 netif_receive_skb(skb);
554891e6
JB		 2607 return;
2608 }
3d30d949
MW		 2609
2610 out_free_skb:
2611 dev_kfree_skb(skb);
2612}
2613
aa0c8636
CL		 2614static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2615 ieee80211_rx_result res)
2616{
2617 switch (res) {
2618 case RX_DROP_MONITOR:
2619 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2620 if (rx->sta)
2621 rx->sta->rx_dropped++;
2622 /* fall through */
2623 case RX_CONTINUE: {
2624 struct ieee80211_rate *rate = NULL;
2625 struct ieee80211_supported_band *sband;
2626 struct ieee80211_rx_status *status;
2627
2628 status = IEEE80211_SKB_RXCB((rx->skb));
2629
2630 sband = rx->local->hw.wiphy->bands[status->band];
2631 if (!(status->flag & RX_FLAG_HT))
2632 rate = &sband->bitrates[status->rate_idx];
2633
2634 ieee80211_rx_cooked_monitor(rx, rate);
2635 break;
2636 }
2637 case RX_DROP_UNUSABLE:
2638 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2639 if (rx->sta)
2640 rx->sta->rx_dropped++;
2641 dev_kfree_skb(rx->skb);
2642 break;
2643 case RX_QUEUED:
2644 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2645 break;
2646 }
2647}
571ecf67 2648
24a8fdad 2649static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2650{
58905290 2651 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2652 struct sk_buff *skb;
8944b79f 2653
e32f85f7
LCC		 2654#define CALL_RXH(rxh) \
2655 do { \
2656 res = rxh(rx); \
2657 if (res != RX_CONTINUE) \
2569a826 2658 goto rxh_next; \
e32f85f7 2659 } while (0);
49461622 2660
24a8fdad
CL		 2661 spin_lock(&rx->local->rx_skb_queue.lock);
2662 if (rx->local->running_rx_handler)
2663 goto unlock;
2664
2665 rx->local->running_rx_handler = true;
2666
2667 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2668 spin_unlock(&rx->local->rx_skb_queue.lock);
2669
2569a826
JB		 2670 /*
2671 * all the other fields are valid across frames
2672 * that belong to an aMPDU since they are on the
2673 * same TID from the same station
2674 */
2675 rx->skb = skb;
2676
2677 CALL_RXH(ieee80211_rx_h_decrypt)
2678 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2679 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2680 CALL_RXH(ieee80211_rx_h_sta_process)
2681 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2682 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2683 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2684#ifdef CONFIG_MAC80211_MESH
aa0c8636 2685 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2686 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2687#endif
2154c81c 2688 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2689 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2690 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2691 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2692 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2693 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2694 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2695 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2696
aa0c8636
CL		 2697 rxh_next:
2698 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2699 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2700#undef CALL_RXH
aa0c8636 2701 }
24a8fdad
CL		 2702
2703 rx->local->running_rx_handler = false;
2704
2705 unlock:
2706 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2707}
2708
4406c376 2709static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2710{
aa0c8636
CL		 2711 ieee80211_rx_result res = RX_DROP_MONITOR;
2712
aa0c8636
CL		 2713#define CALL_RXH(rxh) \
2714 do { \
2715 res = rxh(rx); \
2716 if (res != RX_CONTINUE) \
2717 goto rxh_next; \
2718 } while (0);
2719
aa0c8636
CL		 2720 CALL_RXH(ieee80211_rx_h_check)
2721
24a8fdad 2722 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2723
24a8fdad 2724 ieee80211_rx_handlers(rx);
aa0c8636 2725 return;
49461622 2726
2569a826 2727 rxh_next:
aa0c8636
CL		 2728 ieee80211_rx_handlers_result(rx, res);
2729
2730#undef CALL_RXH
58905290
JB		 2731}
2732
2bff8ebf 2733/*
dd318575
JB		 2734 * This function makes calls into the RX path, therefore
2735 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2736 */
2737void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2738{
554891e6
JB		 2739 struct ieee80211_rx_data rx = {
2740 .sta = sta,
2741 .sdata = sta->sdata,
2742 .local = sta->local,
9e26297a
JB		 2743 /* This is OK -- must be QoS data frame */
2744 .security_idx = tid,
2745 .seqno_idx = tid,
fcf8bd3b 2746 .flags = 0,
554891e6 2747 };
2c15a0cf
CL		 2748 struct tid_ampdu_rx *tid_agg_rx;
2749
2750 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2751 if (!tid_agg_rx)
2752 return;
2bff8ebf 2753
2c15a0cf 2754 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2755 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2756 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2757
24a8fdad 2758 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2759}
2760
571ecf67
JB		 2761/* main receive path */
2762
20b01f80 2763static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2764 struct ieee80211_hdr *hdr)
2765{
20b01f80 2766 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2767 struct sk_buff *skb = rx->skb;
2768 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2769 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2770 int multicast = is_multicast_ether_addr(hdr->addr1);
2771
51fb61e7 2772 switch (sdata->vif.type) {
05c914fe 2773 case NL80211_IFTYPE_STATION:
9bc383de 2774 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2775 return 0;
77fdaa12 2776 if (!multicast &&
b203ca39 2777 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2778 if (!(sdata->dev->flags & IFF_PROMISC) ||
2779 sdata->u.mgd.use_4addr)
23a24def 2780 return 0;
554891e6 2781 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2782 }
2783 break;
05c914fe 2784 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2785 if (!bssid)
2786 return 0;
a7767f95 2787 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2788 return 1;
d48b2968
JB		 2789 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2790 return 0;
23a24def 2791 } else if (!multicast &&
b203ca39 2792 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2793 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2794 return 0;
554891e6 2795 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2796 } else if (!rx->sta) {
2797 int rate_idx;
eb9fb5b8 2798 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2799 rate_idx = 0; /* TODO: HT rates */
2800 else
eb9fb5b8 2801 rate_idx = status->rate_idx;
8bf11d8d
JB		 2802 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2803 BIT(rate_idx));
0fb8ca45 2804 }
23a24def 2805 break;
05c914fe 2806 case NL80211_IFTYPE_MESH_POINT:
6032f934 2807 if (!multicast &&
b203ca39 2808 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2809 if (!(sdata->dev->flags & IFF_PROMISC))
2810 return 0;
2811
554891e6 2812 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2813 }
2814 break;
05c914fe
JB		 2815 case NL80211_IFTYPE_AP_VLAN:
2816 case NL80211_IFTYPE_AP:
23a24def 2817 if (!bssid) {
b203ca39 2818 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2819 return 0;
f142c6b9 2820 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2821 /*
2822 * Accept public action frames even when the
2823 * BSSID doesn't match, this is used for P2P
2824 * and location updates. Note that mac80211
2825 * itself never looks at these frames.
2826 */
d48b2968 2827 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2828 return 1;
d48b2968 2829 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2830 return 0;
554891e6 2831 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2832 }
23a24def 2833 break;
05c914fe 2834 case NL80211_IFTYPE_WDS:
a7767f95 2835 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2836 return 0;
b203ca39 2837 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2838 return 0;
2839 break;
f142c6b9
JB		 2840 case NL80211_IFTYPE_P2P_DEVICE:
2841 if (!ieee80211_is_public_action(hdr, skb->len) &&
2842 !ieee80211_is_probe_req(hdr->frame_control) &&
2843 !ieee80211_is_probe_resp(hdr->frame_control) &&
2844 !ieee80211_is_beacon(hdr->frame_control))
2845 return 0;
2846 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2847 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2848 break;
2ca27bcf 2849 default:
fb1c1cd6 2850 /* should never get here */
f142c6b9 2851 WARN_ON_ONCE(1);
fb1c1cd6 2852 break;
23a24def
JB		 2853 }
2854
2855 return 1;
2856}
2857
4406c376
JB		 2858/*
2859 * This function returns whether or not the SKB
2860 * was destined for RX processing or not, which,
2861 * if consume is true, is equivalent to whether
2862 * or not the skb was consumed.
2863 */
2864static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2865 struct sk_buff *skb, bool consume)
2866{
2867 struct ieee80211_local *local = rx->local;
2868 struct ieee80211_sub_if_data *sdata = rx->sdata;
2869 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2870 struct ieee80211_hdr *hdr = (void *)skb->data;
2871 int prepares;
2872
2873 rx->skb = skb;
554891e6 2874 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2875 prepares = prepare_for_handlers(rx, hdr);
2876
2877 if (!prepares)
2878 return false;
2879
4406c376
JB		 2880 if (!consume) {
2881 skb = skb_copy(skb, GFP_ATOMIC);
2882 if (!skb) {
2883 if (net_ratelimit())
2884 wiphy_debug(local->hw.wiphy,
b305dae4 2885 "failed to copy skb for %s\n",
4406c376
JB		 2886 sdata->name);
2887 return true;
2888 }
2889
2890 rx->skb = skb;
2891 }
2892
2893 ieee80211_invoke_rx_handlers(rx);
2894 return true;
2895}
2896
571ecf67 2897/*
6368e4b1
RR		 2898 * This is the actual Rx frames handler. as it blongs to Rx path it must
2899 * be called with rcu_read_lock protection.
571ecf67 2900 */
71ebb4aa 2901static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2902 struct sk_buff *skb)
571ecf67
JB		 2903{
2904 struct ieee80211_local *local = hw_to_local(hw);
2905 struct ieee80211_sub_if_data *sdata;
571ecf67 2906 struct ieee80211_hdr *hdr;
e3cf8b3f 2907 __le16 fc;
5cf121c3 2908 struct ieee80211_rx_data rx;
4406c376 2909 struct ieee80211_sub_if_data *prev;
56af3268 2910 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2911 int err = 0;
571ecf67 2912
e3cf8b3f 2913 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2914 memset(&rx, 0, sizeof(rx));
2915 rx.skb = skb;
2916 rx.local = local;
72abd81b 2917
e3cf8b3f 2918 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2919 local->dot11ReceivedFragmentCount++;
571ecf67 2920
e3cf8b3f
ZY		 2921 if (ieee80211_is_mgmt(fc))
2922 err = skb_linearize(skb);
2923 else
2924 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2925
2926 if (err) {
2927 dev_kfree_skb(skb);
2928 return;
2929 }
2930
2931 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2932 ieee80211_parse_qos(&rx);
d1c3a37c 2933 ieee80211_verify_alignment(&rx);
38f3714d 2934
d48b2968
JB		 2935 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2936 ieee80211_is_beacon(hdr->frame_control)))
2937 ieee80211_scan_rx(local, skb);
2938
e3cf8b3f 2939 if (ieee80211_is_data(fc)) {
56af3268 2940 prev_sta = NULL;
4406c376 2941
7852e361 2942 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2943 if (!prev_sta) {
2944 prev_sta = sta;
2945 continue;
2946 }
2947
2948 rx.sta = prev_sta;
2949 rx.sdata = prev_sta->sdata;
4406c376 2950 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2951
56af3268 2952 prev_sta = sta;
4406c376 2953 }
56af3268
BG		 2954
2955 if (prev_sta) {
2956 rx.sta = prev_sta;
2957 rx.sdata = prev_sta->sdata;
2958
4406c376 2959 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2960 return;
8e26d5ad 2961 goto out;
56af3268 2962 }
4406c376
JB		 2963 }
2964
4b0dd98e 2965 prev = NULL;
b2e7771e 2966
4b0dd98e
JB		 2967 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2968 if (!ieee80211_sdata_running(sdata))
2969 continue;
340e11f3 2970
4b0dd98e
JB		 2971 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2972 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2973 continue;
340e11f3 2974
4b0dd98e
JB		 2975 /*
2976 * frame is destined for this interface, but if it's
2977 * not also for the previous one we handle that after
2978 * the loop to avoid copying the SKB once too much
2979 */
4bb29f8c 2980
4b0dd98e 2981 if (!prev) {
abe60632 2982 prev = sdata;
4b0dd98e 2983 continue;
340e11f3 2984 }
4bb29f8c 2985
7852e361 2986 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2987 rx.sdata = prev;
2988 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2989
4b0dd98e
JB		 2990 prev = sdata;
2991 }
2992
2993 if (prev) {
7852e361 2994 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2995 rx.sdata = prev;
4406c376 2996
4b0dd98e
JB		 2997 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2998 return;
571ecf67 2999 }
4406c376 3000
8e26d5ad 3001 out:
4406c376 3002 dev_kfree_skb(skb);
571ecf67 3003}
6368e4b1
RR		 3004
3005/*
3006 * This is the receive path handler. It is called by a low level driver when an
3007 * 802.11 MPDU is received from the hardware.
3008 */
103bf9f7 3009void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3010{
3011 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3012 struct ieee80211_rate *rate = NULL;
3013 struct ieee80211_supported_band *sband;
f1d58c25 3014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3015
d20ef63d
JB		 3016 WARN_ON_ONCE(softirq_count() == 0);
3017
444e3803 3018 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3019 goto drop;
8318d78a
JB		 3020
3021 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3022 if (WARN_ON(!sband))
3023 goto drop;
8318d78a 3024
89c3a8ac
JB		 3025 /*
3026 * If we're suspending, it is possible although not too likely
3027 * that we'd be receiving frames after having already partially
3028 * quiesced the stack. We can't process such frames then since
3029 * that might, for example, cause stations to be added or other
3030 * driver callbacks be invoked.
3031 */
77a980dc
JB		 3032 if (unlikely(local->quiescing || local->suspended))
3033 goto drop;
89c3a8ac 3034
04800ada
AN		 3035 /* We might be during a HW reconfig, prevent Rx for the same reason */
3036 if (unlikely(local->in_reconfig))
3037 goto drop;
3038
ea77f12f
JB		 3039 /*
3040 * The same happens when we're not even started,
3041 * but that's worth a warning.
3042 */
77a980dc
JB		 3043 if (WARN_ON(!local->started))
3044 goto drop;
ea77f12f 3045
fc885189 3046 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3047 /*
fc885189
JB		 3048 * Validate the rate, unless a PLCP error means that
3049 * we probably can't have a valid rate here anyway.
e5d6eb83 3050 */
fc885189
JB		 3051
3052 if (status->flag & RX_FLAG_HT) {
3053 /*
3054 * rate_idx is MCS index, which can be [0-76]
3055 * as documented on:
3056 *
3057 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3058 *
3059 * Anything else would be some sort of driver or
3060 * hardware error. The driver should catch hardware
3061 * errors.
3062 */
444e3803 3063 if (WARN(status->rate_idx > 76,
fc885189
JB		 3064 "Rate marked as an HT rate but passed "
3065 "status->rate_idx is not "
3066 "an MCS index [0-76]: %d (0x%02x)\n",
3067 status->rate_idx,
3068 status->rate_idx))
3069 goto drop;
3070 } else {
444e3803 3071 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3072 goto drop;
3073 rate = &sband->bitrates[status->rate_idx];
3074 }
0fb8ca45 3075 }
6368e4b1 3076
554891e6
JB		 3077 status->rx_flags = 0;
3078
6368e4b1
RR		 3079 /*
3080 * key references and virtual interfaces are protected using RCU
3081 * and this requires that we are in a read-side RCU section during
3082 * receive processing
3083 */
3084 rcu_read_lock();
3085
3086 /*
3087 * Frames with failed FCS/PLCP checksum are not returned,
3088 * all other frames are returned without radiotap header
3089 * if it was previously present.
3090 * Also, frames with less than 16 bytes are dropped.
3091 */
f1d58c25 3092 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3093 if (!skb) {
3094 rcu_read_unlock();
3095 return;
3096 }
3097
e1e54068
JB		 3098 ieee80211_tpt_led_trig_rx(local,
3099 ((struct ieee80211_hdr *)skb->data)->frame_control,
3100 skb->len);
071d9ac2 3101 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3102
3103 rcu_read_unlock();
77a980dc
JB		 3104
3105 return;
3106 drop:
3107 kfree_skb(skb);
6368e4b1 3108}
103bf9f7 3109EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3110
3111/* This is a version of the rx handler that can be called from hard irq
3112 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3113void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3114{
3115 struct ieee80211_local *local = hw_to_local(hw);
3116
3117 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3118
571ecf67
JB		 3119 skb->pkt_type = IEEE80211_RX_MSG;
3120 skb_queue_tail(&local->skb_queue, skb);
3121 tasklet_schedule(&local->tasklet);
3122}
3123EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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