projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
mac80211: check management frame header length
[linux-2.6-block.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
133b8226 1144static void ap_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;
0795af57 1148
3e122be0 1149 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1150 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1151 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1152 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1153 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1154 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1155}
1156
ff9458d3 1157static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1158{
bdcbd8e0
JB		 1159 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1160 sta->sta.addr, sta->sta.aid);
004c872e 1161
c2c98fde 1162 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1163 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1164 sta->sta.addr, sta->sta.aid);
af818581
JB		 1165 return;
1166 }
1167
1168 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1169}
1170
d057e5a3
AN		 1171int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1172{
1173 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1174 bool in_ps;
1175
1176 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1177
1178 /* Don't let the same PS state be set twice */
c2c98fde 1179 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1180 if ((start && in_ps) || (!start && !in_ps))
1181 return -EINVAL;
1182
1183 if (start)
1184 ap_sta_ps_start(sta_inf);
1185 else
1186 ap_sta_ps_end(sta_inf);
1187
1188 return 0;
1189}
1190EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1191
47086fc5
JB		 1192static ieee80211_rx_result debug_noinline
1193ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1194{
1195 struct ieee80211_sub_if_data *sdata = rx->sdata;
1196 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1197 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1198 int tid, ac;
1199
1200 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1201 return RX_CONTINUE;
1202
1203 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1204 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1205 return RX_CONTINUE;
1206
1207 /*
1208 * The device handles station powersave, so don't do anything about
1209 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1210 * it to mac80211 since they're handled.)
1211 */
1212 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1213 return RX_CONTINUE;
1214
1215 /*
1216 * Don't do anything if the station isn't already asleep. In
1217 * the uAPSD case, the station will probably be marked asleep,
1218 * in the PS-Poll case the station must be confused ...
1219 */
c2c98fde 1220 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1221 return RX_CONTINUE;
1222
1223 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1224 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1225 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1226 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1227 else
c2c98fde 1228 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1229 }
47086fc5
JB		 1230
1231 /* Free PS Poll skb here instead of returning RX_DROP that would
1232 * count as an dropped frame. */
1233 dev_kfree_skb(rx->skb);
1234
1235 return RX_QUEUED;
1236 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1237 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1238 ieee80211_has_pm(hdr->frame_control) &&
1239 (ieee80211_is_data_qos(hdr->frame_control) ||
1240 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1241 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1242 ac = ieee802_1d_to_ac[tid & 7];
1243
1244 /*
1245 * If this AC is not trigger-enabled do nothing.
1246 *
1247 * NB: This could/should check a separate bitmap of trigger-
1248 * enabled queues, but for now we only implement uAPSD w/o
1249 * TSPEC changes to the ACs, so they're always the same.
1250 */
1251 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1252 return RX_CONTINUE;
1253
1254 /* if we are in a service period, do nothing */
c2c98fde 1255 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1256 return RX_CONTINUE;
1257
c2c98fde 1258 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1259 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1260 else
c2c98fde 1261 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1262 }
1263
1264 return RX_CONTINUE;
1265}
1266
49461622 1267static ieee80211_rx_result debug_noinline
5cf121c3 1268ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1269{
1270 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1271 struct sk_buff *skb = rx->skb;
1272 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1274
1275 if (!sta)
9ae54c84 1276 return RX_CONTINUE;
571ecf67 1277
b291ba11
JB		 1278 /*
1279 * Update last_rx only for IBSS packets which are for the current
1280 * BSSID to avoid keeping the current IBSS network alive in cases
1281 * where other STAs start using different BSSID.
1282 */
05c914fe 1283 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1284 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1285 NL80211_IFTYPE_ADHOC);
b203ca39 1286 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
571ecf67 1287 sta->last_rx = jiffies;
3af6334c
FF		 1288 if (ieee80211_is_data(hdr->frame_control)) {
1289 sta->last_rx_rate_idx = status->rate_idx;
1290 sta->last_rx_rate_flag = status->flag;
1291 }
1292 }
b291ba11
JB		 1293 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1294 /*
33b64eb2
LCC		 1295 * Mesh beacons will update last_rx when if they are found to
1296 * match the current local configuration when processed.
571ecf67 1297 */
b291ba11 1298 sta->last_rx = jiffies;
3af6334c
FF		 1299 if (ieee80211_is_data(hdr->frame_control)) {
1300 sta->last_rx_rate_idx = status->rate_idx;
1301 sta->last_rx_rate_flag = status->flag;
1302 }
571ecf67
JB		 1303 }
1304
554891e6 1305 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1306 return RX_CONTINUE;
571ecf67 1307
3cf335d5
KV		 1308 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1309 ieee80211_sta_rx_notify(rx->sdata, hdr);
1310
571ecf67
JB		 1311 sta->rx_fragments++;
1312 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1313 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1314 sta->last_signal = status->signal;
1315 ewma_add(&sta->avg_signal, -status->signal);
1316 }
571ecf67 1317
72eaa43a
JB		 1318 /*
1319 * Change STA power saving mode only at the end of a frame
1320 * exchange sequence.
1321 */
d057e5a3
AN		 1322 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1323 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1324 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1325 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1326 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1327 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1328 /*
1329 * Ignore doze->wake transitions that are
1330 * indicated by non-data frames, the standard
1331 * is unclear here, but for example going to
1332 * PS mode and then scanning would cause a
1333 * doze->wake transition for the probe request,
1334 * and that is clearly undesirable.
1335 */
1336 if (ieee80211_is_data(hdr->frame_control) &&
1337 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1338 ap_sta_ps_end(sta);
72eaa43a
JB		 1339 } else {
1340 if (ieee80211_has_pm(hdr->frame_control))
1341 ap_sta_ps_start(sta);
1342 }
571ecf67
JB		 1343 }
1344
22403def
JB		 1345 /*
1346 * Drop (qos-)data::nullfunc frames silently, since they
1347 * are used only to control station power saving mode.
1348 */
1349 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1350 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1351 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1352
1353 /*
1354 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1355 * that was not moved to a 4-addr STA vlan yet send
1356 * the event to userspace and for older hostapd drop
1357 * the frame to the monitor interface.
d524215f
FF		 1358 */
1359 if (ieee80211_has_a4(hdr->frame_control) &&
1360 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1361 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1362 !rx->sdata->u.vlan.sta))) {
1363 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1364 cfg80211_rx_unexpected_4addr_frame(
1365 rx->sdata->dev, sta->sta.addr,
1366 GFP_ATOMIC);
d524215f 1367 return RX_DROP_MONITOR;
e7f4a940 1368 }
22403def
JB		 1369 /*
1370 * Update counter and free packet here to avoid
1371 * counting this as a dropped packed.
1372 */
571ecf67
JB		 1373 sta->rx_packets++;
1374 dev_kfree_skb(rx->skb);
9ae54c84 1375 return RX_QUEUED;
571ecf67
JB		 1376 }
1377
9ae54c84 1378 return RX_CONTINUE;
571ecf67
JB		 1379} /* ieee80211_rx_h_sta_process */
1380
571ecf67
JB		 1381static inline struct ieee80211_fragment_entry *
1382ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1383 unsigned int frag, unsigned int seq, int rx_queue,
1384 struct sk_buff **skb)
1385{
1386 struct ieee80211_fragment_entry *entry;
1387 int idx;
1388
1389 idx = sdata->fragment_next;
1390 entry = &sdata->fragments[sdata->fragment_next++];
1391 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1392 sdata->fragment_next = 0;
1393
bdcbd8e0 1394 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1395 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1396
1397 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1398 *skb = NULL;
1399 entry->first_frag_time = jiffies;
1400 entry->seq = seq;
1401 entry->rx_queue = rx_queue;
1402 entry->last_frag = frag;
1403 entry->ccmp = 0;
1404 entry->extra_len = 0;
1405
1406 return entry;
1407}
1408
1409static inline struct ieee80211_fragment_entry *
1410ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1411 unsigned int frag, unsigned int seq,
571ecf67
JB		 1412 int rx_queue, struct ieee80211_hdr *hdr)
1413{
1414 struct ieee80211_fragment_entry *entry;
1415 int i, idx;
1416
1417 idx = sdata->fragment_next;
1418 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1419 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1420
1421 idx--;
1422 if (idx < 0)
1423 idx = IEEE80211_FRAGMENT_MAX - 1;
1424
1425 entry = &sdata->fragments[idx];
1426 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1427 entry->rx_queue != rx_queue ||
1428 entry->last_frag + 1 != frag)
1429 continue;
1430
b73d70ad 1431 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1432
b73d70ad
HH		 1433 /*
1434 * Check ftype and addresses are equal, else check next fragment
1435 */
1436 if (((hdr->frame_control ^ f_hdr->frame_control) &
1437 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1438 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1439 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1440 continue;
1441
ab46623e 1442 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1443 __skb_queue_purge(&entry->skb_list);
1444 continue;
1445 }
1446 return entry;
1447 }
1448
1449 return NULL;
1450}
1451
49461622 1452static ieee80211_rx_result debug_noinline
5cf121c3 1453ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1454{
1455 struct ieee80211_hdr *hdr;
1456 u16 sc;
358c8d9d 1457 __le16 fc;
571ecf67
JB		 1458 unsigned int frag, seq;
1459 struct ieee80211_fragment_entry *entry;
1460 struct sk_buff *skb;
554891e6 1461 struct ieee80211_rx_status *status;
571ecf67 1462
b73d70ad 1463 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1464 fc = hdr->frame_control;
f7fbf70e
JC		 1465
1466 if (ieee80211_is_ctl(fc))
1467 return RX_CONTINUE;
1468
571ecf67
JB		 1469 sc = le16_to_cpu(hdr->seq_ctrl);
1470 frag = sc & IEEE80211_SCTL_FRAG;
1471
358c8d9d 1472 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1473 is_multicast_ether_addr(hdr->addr1))) {
1474 /* not fragmented */
1475 goto out;
1476 }
1477 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478
e3cf8b3f
ZY		 1479 if (skb_linearize(rx->skb))
1480 return RX_DROP_UNUSABLE;
1481
058897a4
AK		 1482 /*
1483 * skb_linearize() might change the skb->data and
1484 * previously cached variables (in this case, hdr) need to
1485 * be refreshed with the new data.
1486 */
1487 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1488 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1489
1490 if (frag == 0) {
1491 /* This is the first fragment of a new frame. */
1492 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1493 rx->seqno_idx, &(rx->skb));
97359d12 1494 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1495 ieee80211_has_protected(fc)) {
9e26297a 1496 int queue = rx->security_idx;
571ecf67
JB		 1497 /* Store CCMP PN so that we can verify that the next
1498 * fragment has a sequential PN value. */
1499 entry->ccmp = 1;
1500 memcpy(entry->last_pn,
9190252c 1501 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1502 CCMP_PN_LEN);
1503 }
9ae54c84 1504 return RX_QUEUED;
571ecf67
JB		 1505 }
1506
1507 /* This is a fragment for a frame that should already be pending in
1508 * fragment cache. Add this fragment to the end of the pending entry.
1509 */
9e26297a
JB		 1510 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1511 rx->seqno_idx, hdr);
571ecf67
JB		 1512 if (!entry) {
1513 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1514 return RX_DROP_MONITOR;
571ecf67
JB		 1515 }
1516
1517 /* Verify that MPDUs within one MSDU have sequential PN values.
1518 * (IEEE 802.11i, 8.3.3.4.5) */
1519 if (entry->ccmp) {
1520 int i;
1521 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1522 int queue;
97359d12 1523 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1524 return RX_DROP_UNUSABLE;
571ecf67
JB		 1525 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1526 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1527 pn[i]++;
1528 if (pn[i])
1529 break;
1530 }
9e26297a 1531 queue = rx->security_idx;
9190252c 1532 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1533 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1534 return RX_DROP_UNUSABLE;
571ecf67
JB		 1535 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1536 }
1537
358c8d9d 1538 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1539 __skb_queue_tail(&entry->skb_list, rx->skb);
1540 entry->last_frag = frag;
1541 entry->extra_len += rx->skb->len;
358c8d9d 1542 if (ieee80211_has_morefrags(fc)) {
571ecf67 1543 rx->skb = NULL;
9ae54c84 1544 return RX_QUEUED;
571ecf67
JB		 1545 }
1546
1547 rx->skb = __skb_dequeue(&entry->skb_list);
1548 if (skb_tailroom(rx->skb) < entry->extra_len) {
1549 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1550 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 GFP_ATOMIC))) {
1552 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1553 __skb_queue_purge(&entry->skb_list);
e4c26add 1554 return RX_DROP_UNUSABLE;
571ecf67
JB		 1555 }
1556 }
1557 while ((skb = __skb_dequeue(&entry->skb_list))) {
1558 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1559 dev_kfree_skb(skb);
1560 }
1561
1562 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1563 status = IEEE80211_SKB_RXCB(rx->skb);
1564 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1565
1566 out:
1567 if (rx->sta)
1568 rx->sta->rx_packets++;
1569 if (is_multicast_ether_addr(hdr->addr1))
1570 rx->local->dot11MulticastReceivedFrameCount++;
1571 else
1572 ieee80211_led_rx(rx->local);
9ae54c84 1573 return RX_CONTINUE;
571ecf67
JB		 1574}
1575
76ee65bf 1576static int
5cf121c3 1577ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1578{
07346f81 1579 if (unlikely(!rx->sta ||
c2c98fde 1580 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1581 return -EACCES;
571ecf67 1582
76ee65bf 1583 return 0;
571ecf67
JB		 1584}
1585
76ee65bf 1586static int
358c8d9d 1587ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1588{
eb9fb5b8
JB		 1589 struct sk_buff *skb = rx->skb;
1590 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1591
3017b80b 1592 /*
7848ba7d
JB		 1593 * Pass through unencrypted frames if the hardware has
1594 * decrypted them already.
3017b80b 1595 */
eb9fb5b8 1596 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1597 return 0;
571ecf67
JB		 1598
1599 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1600 if (unlikely(!ieee80211_has_protected(fc) &&
1601 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1602 ieee80211_is_data(fc) &&
b3fc9c6c 1603 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1604 return -EACCES;
bef5d1c7
JB		 1605
1606 return 0;
1607}
1608
1609static int
1610ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611{
1612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1613 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1614 __le16 fc = hdr->frame_control;
bef5d1c7 1615
e3efca0a
JM		 1616 /*
1617 * Pass through unencrypted frames if the hardware has
1618 * decrypted them already.
1619 */
1620 if (status->flag & RX_FLAG_DECRYPTED)
1621 return 0;
bef5d1c7 1622
c2c98fde 1623 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1624 if (unlikely(!ieee80211_has_protected(fc) &&
1625 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1626 rx->key)) {
1627 if (ieee80211_is_deauth(fc))
1628 cfg80211_send_unprot_deauth(rx->sdata->dev,
1629 rx->skb->data,
1630 rx->skb->len);
1631 else if (ieee80211_is_disassoc(fc))
1632 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1633 rx->skb->data,
1634 rx->skb->len);
f2ca3ea4 1635 return -EACCES;
cf4e594e 1636 }
f2ca3ea4 1637 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1638 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1639 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1640 if (ieee80211_is_deauth(fc))
1641 cfg80211_send_unprot_deauth(rx->sdata->dev,
1642 rx->skb->data,
1643 rx->skb->len);
1644 else if (ieee80211_is_disassoc(fc))
1645 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1646 rx->skb->data,
1647 rx->skb->len);
f2ca3ea4 1648 return -EACCES;
cf4e594e 1649 }
f2ca3ea4
JM		 1650 /*
1651 * When using MFP, Action frames are not allowed prior to
1652 * having configured keys.
1653 */
1654 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1655 ieee80211_is_robust_mgmt_frame(
1656 (struct ieee80211_hdr *) rx->skb->data)))
1657 return -EACCES;
1658 }
b3fc9c6c 1659
76ee65bf 1660 return 0;
571ecf67
JB		 1661}
1662
76ee65bf 1663static int
4114fa21 1664__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1665{
eb9fb5b8 1666 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1667 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1668 bool check_port_control = false;
1669 struct ethhdr *ehdr;
1670 int ret;
f14543ee 1671
4114fa21 1672 *port_control = false;
9bc383de
JB		 1673 if (ieee80211_has_a4(hdr->frame_control) &&
1674 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1675 return -1;
9bc383de 1676
fbb327c5
FF		 1677 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1678 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679
1680 if (!sdata->u.mgd.use_4addr)
1681 return -1;
1682 else
1683 check_port_control = true;
1684 }
1685
9bc383de 1686 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1687 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1688 return -1;
571ecf67 1689
fbb327c5 1690 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1691 if (ret < 0)
fbb327c5
FF		 1692 return ret;
1693
1694 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1695 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1696 *port_control = true;
1697 else if (check_port_control)
fbb327c5
FF		 1698 return -1;
1699
1700 return 0;
76ee65bf 1701}
571ecf67 1702
ce3edf6d
JB		 1703/*
1704 * requires that rx->skb is a frame with ethernet header
1705 */
358c8d9d 1706static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1707{
c97c23e3 1708 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1709 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1710 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1711
1712 /*
1713 * Allow EAPOL frames to us/the PAE group address regardless
1714 * of whether the frame was encrypted or not.
1715 */
a621fa4d 1716 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1717 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1718 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1719 return true;
1720
1721 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1722 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1723 return false;
1724
1725 return true;
1726}
1727
1728/*
1729 * requires that rx->skb is a frame with ethernet header
1730 */
76ee65bf 1731static void
5cf121c3 1732ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1733{
eb9fb5b8
JB		 1734 struct ieee80211_sub_if_data *sdata = rx->sdata;
1735 struct net_device *dev = sdata->dev;
76ee65bf 1736 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1737 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1738 struct sta_info *dsta;
554891e6 1739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1740
76ee65bf
RR		 1741 skb = rx->skb;
1742 xmit_skb = NULL;
571ecf67 1743
05c914fe
JB		 1744 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1745 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1746 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1747 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1748 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1749 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750 /*
1751 * send multicast frames both to higher layers in
1752 * local net stack and back to the wireless medium
1753 */
76ee65bf 1754 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1755 if (!xmit_skb)
bdcbd8e0 1756 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1757 dev->name);
571ecf67 1758 } else {
abe60632
JB		 1759 dsta = sta_info_get(sdata, skb->data);
1760 if (dsta) {
ce3edf6d
JB		 1761 /*
1762 * The destination station is associated to
1763 * this AP (in this VLAN), so send the frame
1764 * directly to it and do not pass it to local
1765 * net stack.
571ecf67 1766 */
76ee65bf 1767 xmit_skb = skb;
571ecf67
JB		 1768 skb = NULL;
1769 }
571ecf67
JB		 1770 }
1771 }
1772
1773 if (skb) {
d1c3a37c
JB		 1774 int align __maybe_unused;
1775
59d9cb07 1776#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1777 /*
1778 * 'align' will only take the values 0 or 2 here
1779 * since all frames are required to be aligned
1780 * to 2-byte boundaries when being passed to
1781 * mac80211. That also explains the __skb_push()
1782 * below.
1783 */
dacb6f1d 1784 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1785 if (align) {
1786 if (WARN_ON(skb_headroom(skb) < 3)) {
1787 dev_kfree_skb(skb);
1788 skb = NULL;
1789 } else {
1790 u8 *data = skb->data;
8ce0b589
ZY		 1791 size_t len = skb_headlen(skb);
1792 skb->data -= align;
1793 memmove(skb->data, data, len);
1794 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1795 }
1796 }
1797#endif
1798
1799 if (skb) {
1800 /* deliver to local stack */
1801 skb->protocol = eth_type_trans(skb, dev);
1802 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1803 netif_receive_skb(skb);
d1c3a37c 1804 }
571ecf67
JB		 1805 }
1806
76ee65bf 1807 if (xmit_skb) {
aef6c928
HS		 1808 /*
1809 * Send to wireless media and increase priority by 256 to
1810 * keep the received priority instead of reclassifying
1811 * the frame (see cfg80211_classify8021d).
1812 */
1813 xmit_skb->priority += 256;
f831e909 1814 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1815 skb_reset_network_header(xmit_skb);
1816 skb_reset_mac_header(xmit_skb);
76ee65bf 1817 dev_queue_xmit(xmit_skb);
571ecf67 1818 }
76ee65bf
RR		 1819}
1820
49461622 1821static ieee80211_rx_result debug_noinline
5cf121c3 1822ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1823{
eb9fb5b8 1824 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1825 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1827 __le16 fc = hdr->frame_control;
eaf85ca7 1828 struct sk_buff_head frame_list;
554891e6 1829 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1830
358c8d9d 1831 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1832 return RX_CONTINUE;
fd4c7f2f 1833
358c8d9d 1834 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1835 return RX_DROP_MONITOR;
fd4c7f2f 1836
554891e6 1837 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1838 return RX_CONTINUE;
fd4c7f2f 1839
eaf85ca7
ZY		 1840 if (ieee80211_has_a4(hdr->frame_control) &&
1841 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842 !rx->sdata->u.vlan.sta)
e4c26add 1843 return RX_DROP_UNUSABLE;
fd4c7f2f 1844
eaf85ca7
ZY		 1845 if (is_multicast_ether_addr(hdr->addr1) &&
1846 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847 rx->sdata->u.vlan.sta) ||
1848 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1849 rx->sdata->u.mgd.use_4addr)))
e4c26add 1850 return RX_DROP_UNUSABLE;
fd4c7f2f 1851
eaf85ca7
ZY		 1852 skb->dev = dev;
1853 __skb_queue_head_init(&frame_list);
fd4c7f2f 1854
e3cf8b3f
ZY		 1855 if (skb_linearize(skb))
1856 return RX_DROP_UNUSABLE;
1857
eaf85ca7
ZY		 1858 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1859 rx->sdata->vif.type,
8b3becad 1860 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1861
eaf85ca7
ZY		 1862 while (!skb_queue_empty(&frame_list)) {
1863 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1864
358c8d9d 1865 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1866 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1867 continue;
1868 }
eaf85ca7
ZY		 1869 dev->stats.rx_packets++;
1870 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1871
1872 ieee80211_deliver_skb(rx);
1873 }
1874
9ae54c84 1875 return RX_QUEUED;
fd4c7f2f
RR		 1876}
1877
bf94e17b 1878#ifdef CONFIG_MAC80211_MESH
b0dee578 1879static ieee80211_rx_result
e32f85f7
LCC		 1880ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881{
30789eb6
TP		 1882 struct ieee80211_hdr *fwd_hdr, *hdr;
1883 struct ieee80211_tx_info *info;
e32f85f7 1884 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1885 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1886 struct ieee80211_local *local = rx->local;
eb9fb5b8 1887 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1889 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1890 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1891 u16 q, hdrlen;
e32f85f7
LCC		 1892
1893 hdr = (struct ieee80211_hdr *) skb->data;
1894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1895 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896
2157fdd6
TP		 1897 /* frame is in RMC, don't forward */
1898 if (ieee80211_is_data(hdr->frame_control) &&
1899 is_multicast_ether_addr(hdr->addr1) &&
1900 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1901 return RX_DROP_MONITOR;
1902
555cb715
JC		 1903 if (!ieee80211_is_data(hdr->frame_control) ||
1904 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 1905 return RX_CONTINUE;
1906
1907 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1908 return RX_DROP_MONITOR;
1909
43b7b314 1910 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1911 struct mesh_path *mppath;
43b7b314
JC		 1912 char *proxied_addr;
1913 char *mpp_addr;
1914
1915 if (is_multicast_ether_addr(hdr->addr1)) {
1916 mpp_addr = hdr->addr3;
1917 proxied_addr = mesh_hdr->eaddr1;
1918 } else {
1919 mpp_addr = hdr->addr4;
1920 proxied_addr = mesh_hdr->eaddr2;
1921 }
79617dee 1922
79617dee 1923 rcu_read_lock();
43b7b314 1924 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1925 if (!mppath) {
43b7b314 1926 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1927 } else {
1928 spin_lock_bh(&mppath->state_lock);
b203ca39 1929 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 1930 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1931 spin_unlock_bh(&mppath->state_lock);
1932 }
1933 rcu_read_unlock();
1934 }
1935
3c5772a5
JC		 1936 /* Frame has reached destination. Don't forward */
1937 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 1938 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 1939 return RX_CONTINUE;
1940
00e96dec 1941 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 1942 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1943 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1944 return RX_DROP_MONITOR;
1945 }
1946 skb_set_queue_mapping(skb, q);
e32f85f7 1947
30789eb6
TP		 1948 if (!--mesh_hdr->ttl) {
1949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 1950 goto out;
30789eb6
TP		 1951 }
1952
d665508b
CYY		 1953 if (!ifmsh->mshcfg.dot11MeshForwarding)
1954 goto out;
1955
30789eb6
TP		 1956 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1957 if (!fwd_skb) {
bdcbd8e0 1958 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 1959 sdata->name);
30789eb6
TP		 1960 goto out;
1961 }
1962
1963 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1964 info = IEEE80211_SKB_CB(fwd_skb);
1965 memset(info, 0, sizeof(*info));
1966 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1967 info->control.vif = &rx->sdata->vif;
1968 info->control.jiffies = jiffies;
1969 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1970 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1971 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1972 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1973 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1974 } else {
1975 /* unable to resolve next hop */
1976 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1977 0, reason, fwd_hdr->addr2, sdata);
1978 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1979 kfree_skb(fwd_skb);
30789eb6 1980 return RX_DROP_MONITOR;
e32f85f7
LCC		 1981 }
1982
30789eb6
TP		 1983 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1984 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1985 out:
3c5772a5 1986 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1987 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1988 return RX_CONTINUE;
1989 else
1990 return RX_DROP_MONITOR;
1991}
bf94e17b 1992#endif
e32f85f7 1993
49461622 1994static ieee80211_rx_result debug_noinline
5cf121c3 1995ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1996{
eb9fb5b8 1997 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1998 struct ieee80211_local *local = rx->local;
eb9fb5b8 1999 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2000 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2001 __le16 fc = hdr->frame_control;
4114fa21 2002 bool port_control;
ce3edf6d 2003 int err;
76ee65bf 2004
358c8d9d 2005 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2006 return RX_CONTINUE;
76ee65bf 2007
358c8d9d 2008 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2009 return RX_DROP_MONITOR;
76ee65bf 2010
f14543ee 2011 /*
e7f4a940
JB		 2012 * Send unexpected-4addr-frame event to hostapd. For older versions,
2013 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2014 */
2015 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2016 sdata->vif.type == NL80211_IFTYPE_AP) {
2017 if (rx->sta &&
2018 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2019 cfg80211_rx_unexpected_4addr_frame(
2020 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2021 return RX_DROP_MONITOR;
e7f4a940 2022 }
f14543ee 2023
4114fa21 2024 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2025 if (unlikely(err))
e4c26add 2026 return RX_DROP_UNUSABLE;
76ee65bf 2027
358c8d9d 2028 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2029 return RX_DROP_MONITOR;
ce3edf6d 2030
4114fa21
FF		 2031 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2032 unlikely(port_control) && sdata->bss) {
2033 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2034 u.ap);
2035 dev = sdata->dev;
2036 rx->sdata = sdata;
2037 }
2038
76ee65bf
RR		 2039 rx->skb->dev = dev;
2040
2041 dev->stats.rx_packets++;
2042 dev->stats.rx_bytes += rx->skb->len;
2043
08ca944e 2044 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2045 !is_multicast_ether_addr(
2046 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2047 (!local->scanning &&
2048 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2049 mod_timer(&local->dynamic_ps_timer, jiffies +
2050 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2051 }
2052
76ee65bf 2053 ieee80211_deliver_skb(rx);
571ecf67 2054
9ae54c84 2055 return RX_QUEUED;
571ecf67
JB		 2056}
2057
49461622 2058static ieee80211_rx_result debug_noinline
24a8fdad 2059ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2060{
71364716 2061 struct sk_buff *skb = rx->skb;
a7767f95 2062 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2063 struct tid_ampdu_rx *tid_agg_rx;
2064 u16 start_seq_num;
2065 u16 tid;
2066
a7767f95 2067 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2068 return RX_CONTINUE;
71364716 2069
a7767f95 2070 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2071 struct {
2072 __le16 control, start_seq_num;
2073 } __packed bar_data;
2074
71364716 2075 if (!rx->sta)
a02ae758 2076 return RX_DROP_MONITOR;
8ae5977f
JB		 2077
2078 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2079 &bar_data, sizeof(bar_data)))
2080 return RX_DROP_MONITOR;
2081
8ae5977f 2082 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2083
2084 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2085 if (!tid_agg_rx)
a02ae758 2086 return RX_DROP_MONITOR;
71364716 2087
8ae5977f 2088 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2089
2090 /* reset session timer */
20ad19d0
JB		 2091 if (tid_agg_rx->timeout)
2092 mod_timer(&tid_agg_rx->session_timer,
2093 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2094
dd318575 2095 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2096 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2097 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2098 start_seq_num);
dd318575
JB		 2099 spin_unlock(&tid_agg_rx->reorder_lock);
2100
a02ae758
JB		 2101 kfree_skb(skb);
2102 return RX_QUEUED;
71364716
RR		 2103 }
2104
08daecae
JB		 2105 /*
2106 * After this point, we only want management frames,
2107 * so we can drop all remaining control frames to
2108 * cooked monitor interfaces.
2109 */
2110 return RX_DROP_MONITOR;
71364716
RR		 2111}
2112
f4f727a6
JM		 2113static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2114 struct ieee80211_mgmt *mgmt,
2115 size_t len)
fea14732
JM		 2116{
2117 struct ieee80211_local *local = sdata->local;
2118 struct sk_buff *skb;
2119 struct ieee80211_mgmt *resp;
2120
b203ca39 2121 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2122 /* Not to own unicast address */
2123 return;
2124 }
2125
b203ca39
JP		 2126 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2127 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2128 /* Not from the current AP or not associated yet. */
fea14732
JM		 2129 return;
2130 }
2131
2132 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2133 /* Too short SA Query request frame */
2134 return;
2135 }
2136
2137 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2138 if (skb == NULL)
2139 return;
2140
2141 skb_reserve(skb, local->hw.extra_tx_headroom);
2142 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2143 memset(resp, 0, 24);
2144 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2145 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2146 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2147 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2148 IEEE80211_STYPE_ACTION);
2149 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2150 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2151 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2152 memcpy(resp->u.action.u.sa_query.trans_id,
2153 mgmt->u.action.u.sa_query.trans_id,
2154 WLAN_SA_QUERY_TR_ID_LEN);
2155
62ae67be 2156 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2157}
2158
2e161f78
JB		 2159static ieee80211_rx_result debug_noinline
2160ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2161{
2162 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2164
2165 /*
2166 * From here on, look only at management frames.
2167 * Data and control frames are already handled,
2168 * and unknown (reserved) frames are useless.
2169 */
2170 if (rx->skb->len < 24)
2171 return RX_DROP_MONITOR;
2172
2173 if (!ieee80211_is_mgmt(mgmt->frame_control))
2174 return RX_DROP_MONITOR;
2175
ee971924
JB		 2176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2177 ieee80211_is_beacon(mgmt->frame_control) &&
2178 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2179 int sig = 0;
2180
2181 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2182 sig = status->signal;
2183
ee971924
JB		 2184 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2185 rx->skb->data, rx->skb->len,
804483e9 2186 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2187 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2188 }
2189
554891e6 2190 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2191 return RX_DROP_MONITOR;
2192
2193 if (ieee80211_drop_unencrypted_mgmt(rx))
2194 return RX_DROP_UNUSABLE;
2195
2196 return RX_CONTINUE;
2197}
2198
de1ede7a
JB		 2199static ieee80211_rx_result debug_noinline
2200ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2201{
2202 struct ieee80211_local *local = rx->local;
eb9fb5b8 2203 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2204 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2205 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2206 int len = rx->skb->len;
2207
2208 if (!ieee80211_is_action(mgmt->frame_control))
2209 return RX_CONTINUE;
2210
026331c4
JM		 2211 /* drop too small frames */
2212 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2213 return RX_DROP_UNUSABLE;
de1ede7a 2214
026331c4 2215 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2216 return RX_DROP_UNUSABLE;
de1ede7a 2217
554891e6 2218 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2219 return RX_DROP_UNUSABLE;
97ebe12a 2220
de1ede7a 2221 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2222 case WLAN_CATEGORY_HT:
2223 /* reject HT action frames from stations not supporting HT */
2224 if (!rx->sta->sta.ht_cap.ht_supported)
2225 goto invalid;
2226
2227 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2228 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2229 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2230 sdata->vif.type != NL80211_IFTYPE_AP &&
2231 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2232 break;
2233
2234 /* verify action & smps_control are present */
2235 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2236 goto invalid;
2237
2238 switch (mgmt->u.action.u.ht_smps.action) {
2239 case WLAN_HT_ACTION_SMPS: {
2240 struct ieee80211_supported_band *sband;
2241 u8 smps;
2242
2243 /* convert to HT capability */
2244 switch (mgmt->u.action.u.ht_smps.smps_control) {
2245 case WLAN_HT_SMPS_CONTROL_DISABLED:
2246 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2247 break;
2248 case WLAN_HT_SMPS_CONTROL_STATIC:
2249 smps = WLAN_HT_CAP_SM_PS_STATIC;
2250 break;
2251 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2252 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2253 break;
2254 default:
2255 goto invalid;
2256 }
2257 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2258
2259 /* if no change do nothing */
2260 if ((rx->sta->sta.ht_cap.cap &
2261 IEEE80211_HT_CAP_SM_PS) == smps)
2262 goto handled;
2263
2264 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2265 rx->sta->sta.ht_cap.cap |= smps;
2266
2267 sband = rx->local->hw.wiphy->bands[status->band];
2268
64f68e5d
JB		 2269 rate_control_rate_update(local, sband, rx->sta,
2270 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2271 goto handled;
2272 }
2273 default:
2274 goto invalid;
2275 }
2276
2277 break;
de1ede7a 2278 case WLAN_CATEGORY_BACK:
8abd3f9b 2279 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2280 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2281 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2282 sdata->vif.type != NL80211_IFTYPE_AP &&
2283 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2284 break;
8abd3f9b 2285
026331c4
JM		 2286 /* verify action_code is present */
2287 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2288 break;
2289
de1ede7a
JB		 2290 switch (mgmt->u.action.u.addba_req.action_code) {
2291 case WLAN_ACTION_ADDBA_REQ:
2292 if (len < (IEEE80211_MIN_ACTION_SIZE +
2293 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2294 goto invalid;
2295 break;
de1ede7a
JB		 2296 case WLAN_ACTION_ADDBA_RESP:
2297 if (len < (IEEE80211_MIN_ACTION_SIZE +
2298 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2299 goto invalid;
2300 break;
de1ede7a
JB		 2301 case WLAN_ACTION_DELBA:
2302 if (len < (IEEE80211_MIN_ACTION_SIZE +
2303 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2304 goto invalid;
2305 break;
2306 default:
2307 goto invalid;
de1ede7a 2308 }
bed7ee6e 2309
8b58ff83 2310 goto queue;
39192c0b 2311 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2312 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2313 break;
46900298
JB		 2314
2315 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2316 break;
46900298 2317
026331c4
JM		 2318 /* verify action_code is present */
2319 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2320 break;
2321
39192c0b
JB		 2322 switch (mgmt->u.action.u.measurement.action_code) {
2323 case WLAN_ACTION_SPCT_MSR_REQ:
2324 if (len < (IEEE80211_MIN_ACTION_SIZE +
2325 sizeof(mgmt->u.action.u.measurement)))
84040805 2326 break;
39192c0b 2327 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2328 goto handled;
c481ec97
S		 2329 case WLAN_ACTION_SPCT_CHL_SWITCH:
2330 if (len < (IEEE80211_MIN_ACTION_SIZE +
2331 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2332 break;
c481ec97 2333
cc32abd4 2334 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2335 break;
cc32abd4 2336
b203ca39 2337 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2338 break;
c481ec97 2339
8b58ff83 2340 goto queue;
39192c0b
JB		 2341 }
2342 break;
fea14732
JM		 2343 case WLAN_CATEGORY_SA_QUERY:
2344 if (len < (IEEE80211_MIN_ACTION_SIZE +
2345 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2346 break;
2347
fea14732
JM		 2348 switch (mgmt->u.action.u.sa_query.action) {
2349 case WLAN_ACTION_SA_QUERY_REQUEST:
2350 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2351 break;
fea14732 2352 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2353 goto handled;
fea14732
JM		 2354 }
2355 break;
8db09850
TP		 2356 case WLAN_CATEGORY_SELF_PROTECTED:
2357 switch (mgmt->u.action.u.self_prot.action_code) {
2358 case WLAN_SP_MESH_PEERING_OPEN:
2359 case WLAN_SP_MESH_PEERING_CLOSE:
2360 case WLAN_SP_MESH_PEERING_CONFIRM:
2361 if (!ieee80211_vif_is_mesh(&sdata->vif))
2362 goto invalid;
2363 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2364 /* userspace handles this frame */
2365 break;
2366 goto queue;
2367 case WLAN_SP_MGK_INFORM:
2368 case WLAN_SP_MGK_ACK:
2369 if (!ieee80211_vif_is_mesh(&sdata->vif))
2370 goto invalid;
2371 break;
2372 }
2373 break;
d3aaec8a 2374 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2375 if (!ieee80211_vif_is_mesh(&sdata->vif))
2376 break;
25d49e4d
TP		 2377 if (mesh_action_is_path_sel(mgmt) &&
2378 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2379 break;
2380 goto queue;
84040805 2381 }
026331c4 2382
2e161f78
JB		 2383 return RX_CONTINUE;
2384
bed7ee6e 2385 invalid:
554891e6 2386 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2387 /* will return in the next handlers */
2388 return RX_CONTINUE;
2389
2390 handled:
2391 if (rx->sta)
2392 rx->sta->rx_packets++;
2393 dev_kfree_skb(rx->skb);
2394 return RX_QUEUED;
2395
2396 queue:
2397 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2398 skb_queue_tail(&sdata->skb_queue, rx->skb);
2399 ieee80211_queue_work(&local->hw, &sdata->work);
2400 if (rx->sta)
2401 rx->sta->rx_packets++;
2402 return RX_QUEUED;
2403}
2404
2405static ieee80211_rx_result debug_noinline
2406ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2407{
554891e6 2408 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2409 int sig = 0;
2e161f78
JB		 2410
2411 /* skip known-bad action frames and return them in the next handler */
554891e6 2412 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2413 return RX_CONTINUE;
d7907448 2414
026331c4
JM		 2415 /*
2416 * Getting here means the kernel doesn't know how to handle
2417 * it, but maybe userspace does ... include returned frames
2418 * so userspace can register for those to know whether ones
2419 * it transmitted were processed or returned.
2420 */
026331c4 2421
804483e9
JB		 2422 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2423 sig = status->signal;
2424
71bbc994 2425 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2426 rx->skb->data, rx->skb->len,
2427 GFP_ATOMIC)) {
2428 if (rx->sta)
2429 rx->sta->rx_packets++;
2430 dev_kfree_skb(rx->skb);
2431 return RX_QUEUED;
2432 }
2433
2434
2435 return RX_CONTINUE;
2436}
2437
2438static ieee80211_rx_result debug_noinline
2439ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2440{
2441 struct ieee80211_local *local = rx->local;
2442 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2443 struct sk_buff *nskb;
2444 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2445 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2446
2447 if (!ieee80211_is_action(mgmt->frame_control))
2448 return RX_CONTINUE;
2449
2450 /*
2451 * For AP mode, hostapd is responsible for handling any action
2452 * frames that we didn't handle, including returning unknown
2453 * ones. For all other modes we will return them to the sender,
2454 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2455 * 802.11-2012 9.24.4.
2e161f78
JB		 2456 * Newer versions of hostapd shall also use the management frame
2457 * registration mechanisms, but older ones still use cooked
2458 * monitor interfaces so push all frames there.
2459 */
554891e6 2460 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2461 (sdata->vif.type == NL80211_IFTYPE_AP ||
2462 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2463 return RX_DROP_MONITOR;
026331c4 2464
4b5ebccc
JB		 2465 if (is_multicast_ether_addr(mgmt->da))
2466 return RX_DROP_MONITOR;
2467
84040805
JB		 2468 /* do not return rejected action frames */
2469 if (mgmt->u.action.category & 0x80)
2470 return RX_DROP_UNUSABLE;
2471
2472 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2473 GFP_ATOMIC);
2474 if (nskb) {
292b4df6 2475 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2476
292b4df6
JL		 2477 nmgmt->u.action.category |= 0x80;
2478 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2479 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2480
2481 memset(nskb->cb, 0, sizeof(nskb->cb));
2482
2483 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2484 }
39192c0b
JB		 2485 dev_kfree_skb(rx->skb);
2486 return RX_QUEUED;
de1ede7a
JB		 2487}
2488
49461622 2489static ieee80211_rx_result debug_noinline
5cf121c3 2490ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2491{
eb9fb5b8 2492 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2493 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2494 __le16 stype;
571ecf67 2495
77a121c3 2496 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2497
77a121c3
JB		 2498 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2499 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2500 sdata->vif.type != NL80211_IFTYPE_STATION)
2501 return RX_DROP_MONITOR;
472dbc45 2502
77a121c3 2503 switch (stype) {
66e67e41 2504 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2505 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2506 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2507 /* process for all: mesh, mlme, ibss */
2508 break;
66e67e41
JB		 2509 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2510 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2511 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2512 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2513 if (is_multicast_ether_addr(mgmt->da) &&
2514 !is_broadcast_ether_addr(mgmt->da))
2515 return RX_DROP_MONITOR;
2516
77a121c3
JB		 2517 /* process only for station */
2518 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2519 return RX_DROP_MONITOR;
2520 break;
2521 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2522 /* process only for ibss */
2523 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2524 return RX_DROP_MONITOR;
2525 break;
2526 default:
2527 return RX_DROP_MONITOR;
2528 }
f9d540ee 2529
77a121c3 2530 /* queue up frame and kick off work to process it */
c1475ca9 2531 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2532 skb_queue_tail(&sdata->skb_queue, rx->skb);
2533 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2534 if (rx->sta)
2535 rx->sta->rx_packets++;
46900298 2536
77a121c3 2537 return RX_QUEUED;
571ecf67
JB		 2538}
2539
5cf121c3 2540/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2541static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2542 struct ieee80211_rate *rate)
3d30d949
MW		 2543{
2544 struct ieee80211_sub_if_data *sdata;
2545 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2546 struct sk_buff *skb = rx->skb, *skb2;
2547 struct net_device *prev_dev = NULL;
eb9fb5b8 2548 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2549 int needed_headroom;
3d30d949 2550
554891e6
JB		 2551 /*
2552 * If cooked monitor has been processed already, then
2553 * don't do it again. If not, set the flag.
2554 */
2555 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2556 goto out_free_skb;
554891e6 2557 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2558
152c477a
JB		 2559 /* If there are no cooked monitor interfaces, just free the SKB */
2560 if (!local->cooked_mntrs)
2561 goto out_free_skb;
2562
293702a3
JB		 2563 /* room for the radiotap header based on driver features */
2564 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2565
293702a3
JB		 2566 if (skb_headroom(skb) < needed_headroom &&
2567 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2568 goto out_free_skb;
3d30d949 2569
293702a3 2570 /* prepend radiotap information */
973ef21a
FF		 2571 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2572 false);
3d30d949
MW		 2573
2574 skb_set_mac_header(skb, 0);
2575 skb->ip_summed = CHECKSUM_UNNECESSARY;
2576 skb->pkt_type = PACKET_OTHERHOST;
2577 skb->protocol = htons(ETH_P_802_2);
2578
2579 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2580 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2581 continue;
2582
05c914fe 2583 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2584 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2585 continue;
2586
2587 if (prev_dev) {
2588 skb2 = skb_clone(skb, GFP_ATOMIC);
2589 if (skb2) {
2590 skb2->dev = prev_dev;
5548a8a1 2591 netif_receive_skb(skb2);
3d30d949
MW		 2592 }
2593 }
2594
2595 prev_dev = sdata->dev;
2596 sdata->dev->stats.rx_packets++;
2597 sdata->dev->stats.rx_bytes += skb->len;
2598 }
2599
2600 if (prev_dev) {
2601 skb->dev = prev_dev;
5548a8a1 2602 netif_receive_skb(skb);
554891e6
JB		 2603 return;
2604 }
3d30d949
MW		 2605
2606 out_free_skb:
2607 dev_kfree_skb(skb);
2608}
2609
aa0c8636
CL		 2610static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2611 ieee80211_rx_result res)
2612{
2613 switch (res) {
2614 case RX_DROP_MONITOR:
2615 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2616 if (rx->sta)
2617 rx->sta->rx_dropped++;
2618 /* fall through */
2619 case RX_CONTINUE: {
2620 struct ieee80211_rate *rate = NULL;
2621 struct ieee80211_supported_band *sband;
2622 struct ieee80211_rx_status *status;
2623
2624 status = IEEE80211_SKB_RXCB((rx->skb));
2625
2626 sband = rx->local->hw.wiphy->bands[status->band];
2627 if (!(status->flag & RX_FLAG_HT))
2628 rate = &sband->bitrates[status->rate_idx];
2629
2630 ieee80211_rx_cooked_monitor(rx, rate);
2631 break;
2632 }
2633 case RX_DROP_UNUSABLE:
2634 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2635 if (rx->sta)
2636 rx->sta->rx_dropped++;
2637 dev_kfree_skb(rx->skb);
2638 break;
2639 case RX_QUEUED:
2640 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2641 break;
2642 }
2643}
571ecf67 2644
24a8fdad 2645static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2646{
58905290 2647 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2648 struct sk_buff *skb;
8944b79f 2649
e32f85f7
LCC		 2650#define CALL_RXH(rxh) \
2651 do { \
2652 res = rxh(rx); \
2653 if (res != RX_CONTINUE) \
2569a826 2654 goto rxh_next; \
e32f85f7 2655 } while (0);
49461622 2656
24a8fdad
CL		 2657 spin_lock(&rx->local->rx_skb_queue.lock);
2658 if (rx->local->running_rx_handler)
2659 goto unlock;
2660
2661 rx->local->running_rx_handler = true;
2662
2663 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2664 spin_unlock(&rx->local->rx_skb_queue.lock);
2665
2569a826
JB		 2666 /*
2667 * all the other fields are valid across frames
2668 * that belong to an aMPDU since they are on the
2669 * same TID from the same station
2670 */
2671 rx->skb = skb;
2672
2673 CALL_RXH(ieee80211_rx_h_decrypt)
2674 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2675 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2676 CALL_RXH(ieee80211_rx_h_sta_process)
2677 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2678 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2679 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2680#ifdef CONFIG_MAC80211_MESH
aa0c8636 2681 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2682 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2683#endif
2154c81c 2684 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2685 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2686 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2687 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2688 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2689 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2690 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2691 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2692
aa0c8636
CL		 2693 rxh_next:
2694 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2695 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2696#undef CALL_RXH
aa0c8636 2697 }
24a8fdad
CL		 2698
2699 rx->local->running_rx_handler = false;
2700
2701 unlock:
2702 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2703}
2704
4406c376 2705static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2706{
aa0c8636
CL		 2707 ieee80211_rx_result res = RX_DROP_MONITOR;
2708
aa0c8636
CL		 2709#define CALL_RXH(rxh) \
2710 do { \
2711 res = rxh(rx); \
2712 if (res != RX_CONTINUE) \
2713 goto rxh_next; \
2714 } while (0);
2715
aa0c8636
CL		 2716 CALL_RXH(ieee80211_rx_h_check)
2717
24a8fdad 2718 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2719
24a8fdad 2720 ieee80211_rx_handlers(rx);
aa0c8636 2721 return;
49461622 2722
2569a826 2723 rxh_next:
aa0c8636
CL		 2724 ieee80211_rx_handlers_result(rx, res);
2725
2726#undef CALL_RXH
58905290
JB		 2727}
2728
2bff8ebf 2729/*
dd318575
JB		 2730 * This function makes calls into the RX path, therefore
2731 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2732 */
2733void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2734{
554891e6
JB		 2735 struct ieee80211_rx_data rx = {
2736 .sta = sta,
2737 .sdata = sta->sdata,
2738 .local = sta->local,
9e26297a
JB		 2739 /* This is OK -- must be QoS data frame */
2740 .security_idx = tid,
2741 .seqno_idx = tid,
fcf8bd3b 2742 .flags = 0,
554891e6 2743 };
2c15a0cf
CL		 2744 struct tid_ampdu_rx *tid_agg_rx;
2745
2746 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2747 if (!tid_agg_rx)
2748 return;
2bff8ebf 2749
2c15a0cf 2750 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2751 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2752 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2753
24a8fdad 2754 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2755}
2756
571ecf67
JB		 2757/* main receive path */
2758
20b01f80 2759static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2760 struct ieee80211_hdr *hdr)
2761{
20b01f80 2762 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2763 struct sk_buff *skb = rx->skb;
2764 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2765 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2766 int multicast = is_multicast_ether_addr(hdr->addr1);
2767
51fb61e7 2768 switch (sdata->vif.type) {
05c914fe 2769 case NL80211_IFTYPE_STATION:
9bc383de 2770 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2771 return 0;
77fdaa12 2772 if (!multicast &&
b203ca39 2773 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2774 if (!(sdata->dev->flags & IFF_PROMISC) ||
2775 sdata->u.mgd.use_4addr)
23a24def 2776 return 0;
554891e6 2777 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2778 }
2779 break;
05c914fe 2780 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2781 if (!bssid)
2782 return 0;
a7767f95 2783 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2784 return 1;
d48b2968
JB		 2785 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2786 return 0;
23a24def 2787 } else if (!multicast &&
b203ca39 2788 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2789 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2790 return 0;
554891e6 2791 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2792 } else if (!rx->sta) {
2793 int rate_idx;
eb9fb5b8 2794 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2795 rate_idx = 0; /* TODO: HT rates */
2796 else
eb9fb5b8 2797 rate_idx = status->rate_idx;
8bf11d8d
JB		 2798 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2799 BIT(rate_idx));
0fb8ca45 2800 }
23a24def 2801 break;
05c914fe 2802 case NL80211_IFTYPE_MESH_POINT:
6032f934 2803 if (!multicast &&
b203ca39 2804 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2805 if (!(sdata->dev->flags & IFF_PROMISC))
2806 return 0;
2807
554891e6 2808 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2809 }
2810 break;
05c914fe
JB		 2811 case NL80211_IFTYPE_AP_VLAN:
2812 case NL80211_IFTYPE_AP:
23a24def 2813 if (!bssid) {
b203ca39 2814 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2815 return 0;
f142c6b9 2816 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2817 /*
2818 * Accept public action frames even when the
2819 * BSSID doesn't match, this is used for P2P
2820 * and location updates. Note that mac80211
2821 * itself never looks at these frames.
2822 */
d48b2968 2823 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2824 return 1;
d48b2968 2825 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2826 return 0;
554891e6 2827 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2828 }
23a24def 2829 break;
05c914fe 2830 case NL80211_IFTYPE_WDS:
a7767f95 2831 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2832 return 0;
b203ca39 2833 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2834 return 0;
2835 break;
f142c6b9
JB		 2836 case NL80211_IFTYPE_P2P_DEVICE:
2837 if (!ieee80211_is_public_action(hdr, skb->len) &&
2838 !ieee80211_is_probe_req(hdr->frame_control) &&
2839 !ieee80211_is_probe_resp(hdr->frame_control) &&
2840 !ieee80211_is_beacon(hdr->frame_control))
2841 return 0;
2842 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2843 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2844 break;
2ca27bcf 2845 default:
fb1c1cd6 2846 /* should never get here */
f142c6b9 2847 WARN_ON_ONCE(1);
fb1c1cd6 2848 break;
23a24def
JB		 2849 }
2850
2851 return 1;
2852}
2853
4406c376
JB		 2854/*
2855 * This function returns whether or not the SKB
2856 * was destined for RX processing or not, which,
2857 * if consume is true, is equivalent to whether
2858 * or not the skb was consumed.
2859 */
2860static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2861 struct sk_buff *skb, bool consume)
2862{
2863 struct ieee80211_local *local = rx->local;
2864 struct ieee80211_sub_if_data *sdata = rx->sdata;
2865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2866 struct ieee80211_hdr *hdr = (void *)skb->data;
2867 int prepares;
2868
2869 rx->skb = skb;
554891e6 2870 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2871 prepares = prepare_for_handlers(rx, hdr);
2872
2873 if (!prepares)
2874 return false;
2875
4406c376
JB		 2876 if (!consume) {
2877 skb = skb_copy(skb, GFP_ATOMIC);
2878 if (!skb) {
2879 if (net_ratelimit())
2880 wiphy_debug(local->hw.wiphy,
b305dae4 2881 "failed to copy skb for %s\n",
4406c376
JB		 2882 sdata->name);
2883 return true;
2884 }
2885
2886 rx->skb = skb;
2887 }
2888
2889 ieee80211_invoke_rx_handlers(rx);
2890 return true;
2891}
2892
571ecf67 2893/*
6368e4b1
RR		 2894 * This is the actual Rx frames handler. as it blongs to Rx path it must
2895 * be called with rcu_read_lock protection.
571ecf67 2896 */
71ebb4aa 2897static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2898 struct sk_buff *skb)
571ecf67
JB		 2899{
2900 struct ieee80211_local *local = hw_to_local(hw);
2901 struct ieee80211_sub_if_data *sdata;
571ecf67 2902 struct ieee80211_hdr *hdr;
e3cf8b3f 2903 __le16 fc;
5cf121c3 2904 struct ieee80211_rx_data rx;
4406c376 2905 struct ieee80211_sub_if_data *prev;
56af3268 2906 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2907 int err = 0;
571ecf67 2908
e3cf8b3f 2909 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2910 memset(&rx, 0, sizeof(rx));
2911 rx.skb = skb;
2912 rx.local = local;
72abd81b 2913
e3cf8b3f 2914 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2915 local->dot11ReceivedFragmentCount++;
571ecf67 2916
4a4f1a58
JB		 2917 if (ieee80211_is_mgmt(fc)) {
2918 /* drop frame if too short for header */
2919 if (skb->len < ieee80211_hdrlen(fc))
2920 err = -ENOBUFS;
2921 else
2922 err = skb_linearize(skb);
2923 } else {
e3cf8b3f 2924 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 2925 }
e3cf8b3f
ZY		 2926
2927 if (err) {
2928 dev_kfree_skb(skb);
2929 return;
2930 }
2931
2932 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2933 ieee80211_parse_qos(&rx);
d1c3a37c 2934 ieee80211_verify_alignment(&rx);
38f3714d 2935
d48b2968
JB		 2936 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2937 ieee80211_is_beacon(hdr->frame_control)))
2938 ieee80211_scan_rx(local, skb);
2939
e3cf8b3f 2940 if (ieee80211_is_data(fc)) {
56af3268 2941 prev_sta = NULL;
4406c376 2942
7852e361 2943 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2944 if (!prev_sta) {
2945 prev_sta = sta;
2946 continue;
2947 }
2948
2949 rx.sta = prev_sta;
2950 rx.sdata = prev_sta->sdata;
4406c376 2951 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2952
56af3268 2953 prev_sta = sta;
4406c376 2954 }
56af3268
BG		 2955
2956 if (prev_sta) {
2957 rx.sta = prev_sta;
2958 rx.sdata = prev_sta->sdata;
2959
4406c376 2960 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2961 return;
8e26d5ad 2962 goto out;
56af3268 2963 }
4406c376
JB		 2964 }
2965
4b0dd98e 2966 prev = NULL;
b2e7771e 2967
4b0dd98e
JB		 2968 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2969 if (!ieee80211_sdata_running(sdata))
2970 continue;
340e11f3 2971
4b0dd98e
JB		 2972 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2973 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2974 continue;
340e11f3 2975
4b0dd98e
JB		 2976 /*
2977 * frame is destined for this interface, but if it's
2978 * not also for the previous one we handle that after
2979 * the loop to avoid copying the SKB once too much
2980 */
4bb29f8c 2981
4b0dd98e 2982 if (!prev) {
abe60632 2983 prev = sdata;
4b0dd98e 2984 continue;
340e11f3 2985 }
4bb29f8c 2986
7852e361 2987 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2988 rx.sdata = prev;
2989 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2990
4b0dd98e
JB		 2991 prev = sdata;
2992 }
2993
2994 if (prev) {
7852e361 2995 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2996 rx.sdata = prev;
4406c376 2997
4b0dd98e
JB		 2998 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2999 return;
571ecf67 3000 }
4406c376 3001
8e26d5ad 3002 out:
4406c376 3003 dev_kfree_skb(skb);
571ecf67 3004}
6368e4b1
RR		 3005
3006/*
3007 * This is the receive path handler. It is called by a low level driver when an
3008 * 802.11 MPDU is received from the hardware.
3009 */
103bf9f7 3010void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3011{
3012 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3013 struct ieee80211_rate *rate = NULL;
3014 struct ieee80211_supported_band *sband;
f1d58c25 3015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3016
d20ef63d
JB		 3017 WARN_ON_ONCE(softirq_count() == 0);
3018
77a980dc
JB		 3019 if (WARN_ON(status->band < 0 ||
3020 status->band >= IEEE80211_NUM_BANDS))
3021 goto drop;
8318d78a
JB		 3022
3023 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3024 if (WARN_ON(!sband))
3025 goto drop;
8318d78a 3026
89c3a8ac
JB		 3027 /*
3028 * If we're suspending, it is possible although not too likely
3029 * that we'd be receiving frames after having already partially
3030 * quiesced the stack. We can't process such frames then since
3031 * that might, for example, cause stations to be added or other
3032 * driver callbacks be invoked.
3033 */
77a980dc
JB		 3034 if (unlikely(local->quiescing || local->suspended))
3035 goto drop;
89c3a8ac 3036
04800ada
AN		 3037 /* We might be during a HW reconfig, prevent Rx for the same reason */
3038 if (unlikely(local->in_reconfig))
3039 goto drop;
3040
ea77f12f
JB		 3041 /*
3042 * The same happens when we're not even started,
3043 * but that's worth a warning.
3044 */
77a980dc
JB		 3045 if (WARN_ON(!local->started))
3046 goto drop;
ea77f12f 3047
fc885189 3048 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3049 /*
fc885189
JB		 3050 * Validate the rate, unless a PLCP error means that
3051 * we probably can't have a valid rate here anyway.
e5d6eb83 3052 */
fc885189
JB		 3053
3054 if (status->flag & RX_FLAG_HT) {
3055 /*
3056 * rate_idx is MCS index, which can be [0-76]
3057 * as documented on:
3058 *
3059 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3060 *
3061 * Anything else would be some sort of driver or
3062 * hardware error. The driver should catch hardware
3063 * errors.
3064 */
3065 if (WARN((status->rate_idx < 0 ||
3066 status->rate_idx > 76),
3067 "Rate marked as an HT rate but passed "
3068 "status->rate_idx is not "
3069 "an MCS index [0-76]: %d (0x%02x)\n",
3070 status->rate_idx,
3071 status->rate_idx))
3072 goto drop;
3073 } else {
3074 if (WARN_ON(status->rate_idx < 0 ||
3075 status->rate_idx >= sband->n_bitrates))
3076 goto drop;
3077 rate = &sband->bitrates[status->rate_idx];
3078 }
0fb8ca45 3079 }
6368e4b1 3080
554891e6
JB		 3081 status->rx_flags = 0;
3082
6368e4b1
RR		 3083 /*
3084 * key references and virtual interfaces are protected using RCU
3085 * and this requires that we are in a read-side RCU section during
3086 * receive processing
3087 */
3088 rcu_read_lock();
3089
3090 /*
3091 * Frames with failed FCS/PLCP checksum are not returned,
3092 * all other frames are returned without radiotap header
3093 * if it was previously present.
3094 * Also, frames with less than 16 bytes are dropped.
3095 */
f1d58c25 3096 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3097 if (!skb) {
3098 rcu_read_unlock();
3099 return;
3100 }
3101
e1e54068
JB		 3102 ieee80211_tpt_led_trig_rx(local,
3103 ((struct ieee80211_hdr *)skb->data)->frame_control,
3104 skb->len);
071d9ac2 3105 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3106
3107 rcu_read_unlock();
77a980dc
JB		 3108
3109 return;
3110 drop:
3111 kfree_skb(skb);
6368e4b1 3112}
103bf9f7 3113EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3114
3115/* This is a version of the rx handler that can be called from hard irq
3116 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3117void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3118{
3119 struct ieee80211_local *local = hw_to_local(hw);
3120
3121 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3122
571ecf67
JB		 3123 skb->pkt_type = IEEE80211_RX_MSG;
3124 skb_queue_tail(&local->skb_queue, skb);
3125 tasklet_schedule(&local->tasklet);
3126}
3127EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)