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mac80211: fix timing for 5 MHz and 10 MHz channels
[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{
90b9e446
JB		 43 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
44
b2e7771e
JB		 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
e3cf8b3f 47 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
0624760c 52 return NULL;
b2e7771e
JB		 53 }
54 }
55
90b9e446
JB		 56 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
58
b2e7771e
JB		 59 return skb;
60}
61
1df332e8 62static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
b2e7771e 63{
f1d58c25 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
605f1a5b
JB		 65 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
b2e7771e 68
4c298677
JB		 69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
b2e7771e 72 return 1;
605f1a5b
JB		 73 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
b2e7771e 75 return 1;
87228f57
HH		 76 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 79 return 1;
80 return 0;
81}
82
601ae7f2 83static int
90b9e446
JB		 84ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
601ae7f2
BR		 86{
87 int len;
88
89 /* always present fields */
a144f378 90 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 91
a144f378 92 /* allocate extra bitmaps */
90b9e446
JB		 93 if (status->vendor_radiotap_len)
94 len += 4;
a144f378
JB		 95 if (status->chains)
96 len += 4 * hweight8(status->chains);
90b9e446
JB		 97
98 if (ieee80211_have_rx_timestamp(status)) {
99 len = ALIGN(len, 8);
601ae7f2 100 len += 8;
90b9e446 101 }
7fee5372 102 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 103 len += 1;
601ae7f2 104
a144f378
JB		 105 /* antenna field, if we don't have per-chain info */
106 if (!status->chains)
107 len += 1;
108
90b9e446
JB		 109 /* padding for RX_FLAGS if necessary */
110 len = ALIGN(len, 2);
601ae7f2 111
6d744bac
JB		 112 if (status->flag & RX_FLAG_HT) /* HT info */
113 len += 3;
114
4c298677 115 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 116 len = ALIGN(len, 4);
4c298677
JB		 117 len += 8;
118 }
119
51648921
JB		 120 if (status->flag & RX_FLAG_VHT) {
121 len = ALIGN(len, 2);
122 len += 12;
123 }
124
a144f378
JB		 125 if (status->chains) {
126 /* antenna and antenna signal fields */
127 len += 2 * hweight8(status->chains);
128 }
129
90b9e446
JB		 130 if (status->vendor_radiotap_len) {
131 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
132 status->vendor_radiotap_align = 1;
133 /* align standard part of vendor namespace */
134 len = ALIGN(len, 2);
135 /* allocate standard part of vendor namespace */
136 len += 6;
137 /* align vendor-defined part */
138 len = ALIGN(len, status->vendor_radiotap_align);
139 /* vendor-defined part is already in skb */
140 }
141
601ae7f2
BR		 142 return len;
143}
144
00ea6deb 145/*
601ae7f2
BR		 146 * ieee80211_add_rx_radiotap_header - add radiotap header
147 *
148 * add a radiotap header containing all the fields which the hardware provided.
149 */
150static void
151ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
152 struct sk_buff *skb,
601ae7f2 153 struct ieee80211_rate *rate,
973ef21a 154 int rtap_len, bool has_fcs)
601ae7f2 155{
f1d58c25 156 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 157 struct ieee80211_radiotap_header *rthdr;
158 unsigned char *pos;
a144f378
JB		 159 __le32 *it_present;
160 u32 it_present_val;
6a86b9c7 161 u16 rx_flags = 0;
a144f378
JB		 162 int mpdulen, chain;
163 unsigned long chains = status->chains;
f4bda337
TP		 164
165 mpdulen = skb->len;
166 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
167 mpdulen += FCS_LEN;
601ae7f2
BR		 168
169 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
170 memset(rthdr, 0, rtap_len);
a144f378 171 it_present = &rthdr->it_present;
601ae7f2
BR		 172
173 /* radiotap header, set always present flags */
90b9e446 174 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
a144f378
JB		 175 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
176 BIT(IEEE80211_RADIOTAP_CHANNEL) |
177 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
178
179 if (!status->chains)
180 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
181
182 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
183 it_present_val |=
184 BIT(IEEE80211_RADIOTAP_EXT) |
185 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
186 put_unaligned_le32(it_present_val, it_present);
187 it_present++;
188 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
189 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
190 }
601ae7f2 191
90b9e446 192 if (status->vendor_radiotap_len) {
a144f378
JB		 193 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
194 BIT(IEEE80211_RADIOTAP_EXT);
195 put_unaligned_le32(it_present_val, it_present);
196 it_present++;
197 it_present_val = status->vendor_radiotap_bitmap;
90b9e446
JB		 198 }
199
a144f378
JB		 200 put_unaligned_le32(it_present_val, it_present);
201
202 pos = (void *)(it_present + 1);
203
601ae7f2
BR		 204 /* the order of the following fields is important */
205
206 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 207 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 208 /* padding */
209 while ((pos - (u8 *)rthdr) & 7)
210 *pos++ = 0;
f4bda337
TP		 211 put_unaligned_le64(
212 ieee80211_calculate_rx_timestamp(local, status,
213 mpdulen, 0),
214 pos);
1df332e8 215 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 216 pos += 8;
217 }
218
219 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 220 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 221 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 222 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
223 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 224 if (status->flag & RX_FLAG_SHORTPRE)
225 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 226 pos++;
227
228 /* IEEE80211_RADIOTAP_RATE */
5614618e 229 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 230 /*
f8d1ccf1 231 * Without rate information don't add it. If we have,
38f37be2 232 * MCS information is a separate field in radiotap,
73b48099
JB		 233 * added below. The byte here is needed as padding
234 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 235 */
236 *pos = 0;
8d6f658e 237 } else {
ebe6c7ba 238 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 239 *pos = rate->bitrate / 5;
8d6f658e 240 }
601ae7f2
BR		 241 pos++;
242
243 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 244 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 245 pos += 2;
246 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 247 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
248 pos);
5614618e 249 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
5f0b7de5
JB		 250 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
251 pos);
f8d1ccf1 252 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 253 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
254 pos);
f8d1ccf1 255 else if (rate)
6a86b9c7
JB		 256 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
257 pos);
f8d1ccf1
JB		 258 else
259 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 260 pos += 2;
261
262 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 263 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
264 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 265 *pos = status->signal;
266 rthdr->it_present |=
267 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
268 pos++;
269 }
270
601ae7f2
BR		 271 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
272
a144f378
JB		 273 if (!status->chains) {
274 /* IEEE80211_RADIOTAP_ANTENNA */
275 *pos = status->antenna;
276 pos++;
277 }
601ae7f2 278
601ae7f2
BR		 279 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
280
281 /* IEEE80211_RADIOTAP_RX_FLAGS */
282 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 283 if ((pos - (u8 *)rthdr) & 1)
90b9e446 284 *pos++ = 0;
aae89831 285 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 286 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
287 put_unaligned_le16(rx_flags, pos);
601ae7f2 288 pos += 2;
6d744bac
JB		 289
290 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 291 unsigned int stbc;
292
6d744bac 293 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 294 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 295 *pos = 0;
296 if (status->flag & RX_FLAG_SHORT_GI)
297 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
298 if (status->flag & RX_FLAG_40MHZ)
299 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 300 if (status->flag & RX_FLAG_HT_GF)
301 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
786677d1
OR		 302 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
303 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 304 pos++;
305 *pos++ = status->rate_idx;
306 }
4c298677
JB		 307
308 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
309 u16 flags = 0;
310
311 /* ensure 4 byte alignment */
312 while ((pos - (u8 *)rthdr) & 3)
313 pos++;
314 rthdr->it_present |=
315 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
316 put_unaligned_le32(status->ampdu_reference, pos);
317 pos += 4;
318 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
319 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
320 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
321 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
322 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
323 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
324 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
325 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
326 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
327 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
328 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
329 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
330 put_unaligned_le16(flags, pos);
331 pos += 2;
332 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
333 *pos++ = status->ampdu_delimiter_crc;
334 else
335 *pos++ = 0;
336 *pos++ = 0;
337 }
90b9e446 338
51648921
JB		 339 if (status->flag & RX_FLAG_VHT) {
340 u16 known = local->hw.radiotap_vht_details;
341
342 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
343 /* known field - how to handle 80+80? */
344 if (status->flag & RX_FLAG_80P80MHZ)
345 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
346 put_unaligned_le16(known, pos);
347 pos += 2;
348 /* flags */
349 if (status->flag & RX_FLAG_SHORT_GI)
350 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
351 pos++;
352 /* bandwidth */
353 if (status->flag & RX_FLAG_80MHZ)
354 *pos++ = 4;
355 else if (status->flag & RX_FLAG_80P80MHZ)
356 *pos++ = 0; /* marked not known above */
357 else if (status->flag & RX_FLAG_160MHZ)
358 *pos++ = 11;
359 else if (status->flag & RX_FLAG_40MHZ)
360 *pos++ = 1;
361 else /* 20 MHz */
362 *pos++ = 0;
363 /* MCS/NSS */
364 *pos = (status->rate_idx << 4) | status->vht_nss;
365 pos += 4;
366 /* coding field */
367 pos++;
368 /* group ID */
369 pos++;
370 /* partial_aid */
371 pos += 2;
372 }
373
a144f378
JB		 374 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
375 *pos++ = status->chain_signal[chain];
376 *pos++ = chain;
377 }
378
90b9e446
JB		 379 if (status->vendor_radiotap_len) {
380 /* ensure 2 byte alignment for the vendor field as required */
381 if ((pos - (u8 *)rthdr) & 1)
382 *pos++ = 0;
383 *pos++ = status->vendor_radiotap_oui[0];
384 *pos++ = status->vendor_radiotap_oui[1];
385 *pos++ = status->vendor_radiotap_oui[2];
386 *pos++ = status->vendor_radiotap_subns;
387 put_unaligned_le16(status->vendor_radiotap_len, pos);
388 pos += 2;
389 /* align the actual payload as requested */
390 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
391 *pos++ = 0;
392 }
601ae7f2
BR		 393}
394
b2e7771e
JB		 395/*
396 * This function copies a received frame to all monitor interfaces and
397 * returns a cleaned-up SKB that no longer includes the FCS nor the
398 * radiotap header the driver might have added.
399 */
400static struct sk_buff *
401ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 402 struct ieee80211_rate *rate)
b2e7771e 403{
f1d58c25 404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 405 struct ieee80211_sub_if_data *sdata;
293702a3 406 int needed_headroom;
b2e7771e
JB		 407 struct sk_buff *skb, *skb2;
408 struct net_device *prev_dev = NULL;
409 int present_fcs_len = 0;
b2e7771e
JB		 410
411 /*
412 * First, we may need to make a copy of the skb because
413 * (1) we need to modify it for radiotap (if not present), and
414 * (2) the other RX handlers will modify the skb we got.
415 *
416 * We don't need to, of course, if we aren't going to return
417 * the SKB because it has a bad FCS/PLCP checksum.
418 */
0869aea0 419
b2e7771e
JB		 420 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
421 present_fcs_len = FCS_LEN;
422
605f1a5b
JB		 423 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
424 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 425 dev_kfree_skb(origskb);
426 return NULL;
427 }
428
b2e7771e 429 if (!local->monitors) {
0869aea0 430 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 431 dev_kfree_skb(origskb);
432 return NULL;
433 }
434
0869aea0 435 return remove_monitor_info(local, origskb);
b2e7771e
JB		 436 }
437
751413ea
HS		 438 /* room for the radiotap header based on driver features */
439 needed_headroom = ieee80211_rx_radiotap_space(local, status);
440
0869aea0 441 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 442 /* only need to expand headroom if necessary */
443 skb = origskb;
444 origskb = NULL;
445
446 /*
447 * This shouldn't trigger often because most devices have an
448 * RX header they pull before we get here, and that should
449 * be big enough for our radiotap information. We should
450 * probably export the length to drivers so that we can have
451 * them allocate enough headroom to start with.
452 */
453 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 454 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 455 dev_kfree_skb(skb);
456 return NULL;
457 }
458 } else {
459 /*
460 * Need to make a copy and possibly remove radiotap header
461 * and FCS from the original.
462 */
463 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
464
0869aea0 465 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 466
467 if (!skb)
468 return origskb;
469 }
470
0869aea0 471 /* prepend radiotap information */
973ef21a
FF		 472 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
473 true);
b2e7771e 474
ce3edf6d 475 skb_reset_mac_header(skb);
b2e7771e
JB		 476 skb->ip_summed = CHECKSUM_UNNECESSARY;
477 skb->pkt_type = PACKET_OTHERHOST;
478 skb->protocol = htons(ETH_P_802_2);
479
480 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 481 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 482 continue;
483
3d30d949
MW		 484 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
485 continue;
486
9607e6b6 487 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 488 continue;
489
b2e7771e
JB		 490 if (prev_dev) {
491 skb2 = skb_clone(skb, GFP_ATOMIC);
492 if (skb2) {
493 skb2->dev = prev_dev;
5548a8a1 494 netif_receive_skb(skb2);
b2e7771e
JB		 495 }
496 }
497
498 prev_dev = sdata->dev;
499 sdata->dev->stats.rx_packets++;
500 sdata->dev->stats.rx_bytes += skb->len;
501 }
502
503 if (prev_dev) {
504 skb->dev = prev_dev;
5548a8a1 505 netif_receive_skb(skb);
b2e7771e
JB		 506 } else
507 dev_kfree_skb(skb);
508
509 return origskb;
510}
511
5cf121c3 512static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 513{
238f74a2 514 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 515 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 516 int tid, seqno_idx, security_idx;
6e0d114d
JB		 517
518 /* does the frame have a qos control field? */
238f74a2
HH		 519 if (ieee80211_is_data_qos(hdr->frame_control)) {
520 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 521 /* frame has qos control */
238f74a2 522 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 523 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 524 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 525
526 seqno_idx = tid;
527 security_idx = tid;
6e0d114d 528 } else {
1411f9b5
JB		 529 /*
530 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
531 *
532 * Sequence numbers for management frames, QoS data
533 * frames with a broadcast/multicast address in the
534 * Address 1 field, and all non-QoS data frames sent
535 * by QoS STAs are assigned using an additional single
536 * modulo-4096 counter, [...]
537 *
538 * We also use that counter for non-QoS STAs.
539 */
5a306f58 540 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 541 security_idx = 0;
542 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 543 security_idx = IEEE80211_NUM_TIDS;
9e26297a 544 tid = 0;
6e0d114d 545 }
52865dfd 546
9e26297a
JB		 547 rx->seqno_idx = seqno_idx;
548 rx->security_idx = security_idx;
6e0d114d
JB		 549 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
550 * For now, set skb->priority to 0 for other cases. */
551 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 552}
6e0d114d 553
d1c3a37c
JB		 554/**
555 * DOC: Packet alignment
556 *
557 * Drivers always need to pass packets that are aligned to two-byte boundaries
558 * to the stack.
559 *
560 * Additionally, should, if possible, align the payload data in a way that
561 * guarantees that the contained IP header is aligned to a four-byte
562 * boundary. In the case of regular frames, this simply means aligning the
563 * payload to a four-byte boundary (because either the IP header is directly
564 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 565 * in front of it). If the payload data is not properly aligned and the
566 * architecture doesn't support efficient unaligned operations, mac80211
567 * will align the data.
d1c3a37c
JB		 568 *
569 * With A-MSDU frames, however, the payload data address must yield two modulo
570 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
571 * push the IP header further back to a multiple of four again. Thankfully, the
572 * specs were sane enough this time around to require padding each A-MSDU
573 * subframe to a length that is a multiple of four.
574 *
25985edc 575 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 576 * the payload is not supported, the driver is required to move the 802.11
577 * header to be directly in front of the payload in that case.
578 */
579static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 580{
59d9cb07
KV		 581#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
582 WARN_ONCE((unsigned long)rx->skb->data & 1,
583 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 584#endif
6e0d114d
JB		 585}
586
6368e4b1 587
571ecf67
JB		 588/* rx handlers */
589
3cfcf6ac
JM		 590static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
591{
592 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
593
594 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
595 return 0;
596
597 return ieee80211_is_robust_mgmt_frame(hdr);
598}
599
600
601static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
602{
603 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
604
605 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
606 return 0;
607
608 return ieee80211_is_robust_mgmt_frame(hdr);
609}
610
611
612/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
613static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
614{
615 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
616 struct ieee80211_mmie *mmie;
617
1df332e8 618 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 619 return -1;
620
621 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
622 return -1; /* not a robust management frame */
623
624 mmie = (struct ieee80211_mmie *)
625 (skb->data + skb->len - sizeof(*mmie));
626 if (mmie->element_id != WLAN_EID_MMIE ||
627 mmie->length != sizeof(*mmie) - 2)
628 return -1;
629
630 return le16_to_cpu(mmie->key_id);
631}
632
1df332e8 633static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 634{
a7767f95 635 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 636 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 637
a7767f95 638 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 639 if (is_multicast_ether_addr(hdr->addr1)) {
640 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 641 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 642 return RX_DROP_MONITOR;
b203ca39 643 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 644 return RX_DROP_MONITOR;
645 } else {
646 if (!ieee80211_has_a4(hdr->frame_control))
647 return RX_DROP_MONITOR;
b203ca39 648 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 649 return RX_DROP_MONITOR;
650 }
33b64eb2
LCC		 651 }
652
653 /* If there is not an established peer link and this is not a peer link
654 * establisment frame, beacon or probe, drop the frame.
655 */
656
57cf8043 657 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 658 struct ieee80211_mgmt *mgmt;
d6d1a5a7 659
a7767f95 660 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 661 return RX_DROP_MONITOR;
662
a7767f95 663 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 664 u8 category;
9b395bc3
JB		 665
666 /* make sure category field is present */
667 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
668 return RX_DROP_MONITOR;
669
33b64eb2 670 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 671 category = mgmt->u.action.category;
672 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 673 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 674 return RX_DROP_MONITOR;
33b64eb2 675 return RX_CONTINUE;
33b64eb2
LCC		 676 }
677
a7767f95
HH		 678 if (ieee80211_is_probe_req(hdr->frame_control) ||
679 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 680 ieee80211_is_beacon(hdr->frame_control) ||
681 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 682 return RX_CONTINUE;
683
684 return RX_DROP_MONITOR;
a7767f95
HH		 685 }
686
902acc78
JB		 687 return RX_CONTINUE;
688}
33b64eb2 689
d3b2fb53 690static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 691 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 692 int index,
693 struct sk_buff_head *frames)
1edfb1af 694{
1edfb1af 695 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 696 struct ieee80211_rx_status *status;
1edfb1af 697
dd318575
JB		 698 lockdep_assert_held(&tid_agg_rx->reorder_lock);
699
1edfb1af
JB		 700 if (!skb)
701 goto no_frame;
702
071d9ac2 703 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 704 tid_agg_rx->stored_mpdu_num--;
705 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 706 status = IEEE80211_SKB_RXCB(skb);
707 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
f9e124fb 708 __skb_queue_tail(frames, skb);
1edfb1af
JB		 709
710no_frame:
9a886586 711 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 712}
713
d3b2fb53 714static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 715 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 716 u16 head_seq_num,
717 struct sk_buff_head *frames)
1edfb1af
JB		 718{
719 int index;
720
dd318575
JB		 721 lockdep_assert_held(&tid_agg_rx->reorder_lock);
722
9a886586
JB		 723 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
724 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
725 tid_agg_rx->ssn) %
1edfb1af 726 tid_agg_rx->buf_size;
f9e124fb
CL		 727 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
728 frames);
1edfb1af
JB		 729 }
730}
731
732/*
733 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
734 * the skb was added to the buffer longer than this time ago, the earlier
735 * frames that have not yet been received are assumed to be lost and the skb
736 * can be released for processing. This may also release other skb's from the
737 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 738 *
739 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 740 */
741#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
742
d3b2fb53 743static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 744 struct tid_ampdu_rx *tid_agg_rx,
745 struct sk_buff_head *frames)
aa0c8636 746{
2bff8ebf 747 int index, j;
aa0c8636 748
dd318575
JB		 749 lockdep_assert_held(&tid_agg_rx->reorder_lock);
750
aa0c8636 751 /* release the buffer until next missing frame */
9a886586
JB		 752 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
753 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
aa0c8636 754 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 755 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 756 /*
757 * No buffers ready to be released, but check whether any
758 * frames in the reorder buffer have timed out.
759 */
aa0c8636
CL		 760 int skipped = 1;
761 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
762 j = (j + 1) % tid_agg_rx->buf_size) {
763 if (!tid_agg_rx->reorder_buf[j]) {
764 skipped++;
765 continue;
766 }
499fe9a4
DH		 767 if (skipped &&
768 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 769 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 770 goto set_release_timer;
aa0c8636 771
bdcbd8e0
JB		 772 ht_dbg_ratelimited(sdata,
773 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 774 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
775 frames);
aa0c8636
CL		 776
777 /*
778 * Increment the head seq# also for the skipped slots.
779 */
780 tid_agg_rx->head_seq_num =
9a886586
JB		 781 (tid_agg_rx->head_seq_num +
782 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 783 skipped = 0;
784 }
785 } else while (tid_agg_rx->reorder_buf[index]) {
f9e124fb
CL		 786 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
787 frames);
9a886586
JB		 788 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
789 tid_agg_rx->ssn) %
aa0c8636
CL		 790 tid_agg_rx->buf_size;
791 }
2bff8ebf
CL		 792
793 if (tid_agg_rx->stored_mpdu_num) {
9a886586
JB		 794 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
795 tid_agg_rx->ssn) %
796 tid_agg_rx->buf_size;
2bff8ebf
CL		 797
798 for (; j != (index - 1) % tid_agg_rx->buf_size;
799 j = (j + 1) % tid_agg_rx->buf_size) {
800 if (tid_agg_rx->reorder_buf[j])
801 break;
802 }
803
804 set_release_timer:
805
806 mod_timer(&tid_agg_rx->reorder_timer,
334df731 807 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 808 HT_RX_REORDER_BUF_TIMEOUT);
809 } else {
810 del_timer(&tid_agg_rx->reorder_timer);
811 }
aa0c8636
CL		 812}
813
1edfb1af
JB		 814/*
815 * As this function belongs to the RX path it must be under
816 * rcu_read_lock protection. It returns false if the frame
817 * can be processed immediately, true if it was consumed.
818 */
d3b2fb53 819static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 820 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 821 struct sk_buff *skb,
822 struct sk_buff_head *frames)
1edfb1af
JB		 823{
824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
825 u16 sc = le16_to_cpu(hdr->seq_ctrl);
826 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
827 u16 head_seq_num, buf_size;
828 int index;
2bff8ebf 829 bool ret = true;
1edfb1af 830
dd318575
JB		 831 spin_lock(&tid_agg_rx->reorder_lock);
832
1edfb1af
JB		 833 buf_size = tid_agg_rx->buf_size;
834 head_seq_num = tid_agg_rx->head_seq_num;
835
836 /* frame with out of date sequence number */
9a886586 837 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 838 dev_kfree_skb(skb);
2bff8ebf 839 goto out;
1edfb1af
JB		 840 }
841
842 /*
843 * If frame the sequence number exceeds our buffering window
844 * size release some previous frames to make room for this one.
845 */
9a886586
JB		 846 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
847 head_seq_num = ieee80211_sn_inc(
848 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 849 /* release stored frames up to new head to stack */
d3b2fb53 850 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 851 head_seq_num, frames);
1edfb1af
JB		 852 }
853
854 /* Now the new frame is always in the range of the reordering buffer */
855
9a886586
JB		 856 index = ieee80211_sn_sub(mpdu_seq_num,
857 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
1edfb1af
JB		 858
859 /* check if we already stored this frame */
860 if (tid_agg_rx->reorder_buf[index]) {
861 dev_kfree_skb(skb);
2bff8ebf 862 goto out;
1edfb1af
JB		 863 }
864
865 /*
866 * If the current MPDU is in the right order and nothing else
867 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 868 * If it is first but there's something stored, we may be able
869 * to release frames after this one.
1edfb1af
JB		 870 */
871 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
872 tid_agg_rx->stored_mpdu_num == 0) {
9a886586
JB		 873 tid_agg_rx->head_seq_num =
874 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 875 ret = false;
876 goto out;
1edfb1af
JB		 877 }
878
879 /* put the frame in the reordering buffer */
880 tid_agg_rx->reorder_buf[index] = skb;
881 tid_agg_rx->reorder_time[index] = jiffies;
882 tid_agg_rx->stored_mpdu_num++;
f9e124fb 883 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1edfb1af 884
2bff8ebf
CL		 885 out:
886 spin_unlock(&tid_agg_rx->reorder_lock);
887 return ret;
1edfb1af
JB		 888}
889
890/*
891 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
892 * true if the MPDU was buffered, false if it should be processed.
893 */
f9e124fb
CL		 894static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
895 struct sk_buff_head *frames)
1edfb1af 896{
2569a826
JB		 897 struct sk_buff *skb = rx->skb;
898 struct ieee80211_local *local = rx->local;
1edfb1af 899 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 901 struct sta_info *sta = rx->sta;
1edfb1af
JB		 902 struct tid_ampdu_rx *tid_agg_rx;
903 u16 sc;
6cc00d54 904 u8 tid, ack_policy;
1edfb1af
JB		 905
906 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 907 goto dont_reorder;
1edfb1af
JB		 908
909 /*
910 * filter the QoS data rx stream according to
911 * STA/TID and check if this STA/TID is on aggregation
912 */
913
1edfb1af 914 if (!sta)
2569a826 915 goto dont_reorder;
1edfb1af 916
6cc00d54
TP		 917 ack_policy = *ieee80211_get_qos_ctl(hdr) &
918 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 919 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
920
a87f736d
JB		 921 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
922 if (!tid_agg_rx)
923 goto dont_reorder;
1edfb1af
JB		 924
925 /* qos null data frames are excluded */
926 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 927 goto dont_reorder;
1edfb1af 928
6cc00d54
TP		 929 /* not part of a BA session */
930 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
931 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
932 goto dont_reorder;
933
660c6a44
TP		 934 /* not actually part of this BA session */
935 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
936 goto dont_reorder;
937
1edfb1af
JB		 938 /* new, potentially un-ordered, ampdu frame - process it */
939
940 /* reset session timer */
941 if (tid_agg_rx->timeout)
12d3952f 942 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 943
944 /* if this mpdu is fragmented - terminate rx aggregation session */
945 sc = le16_to_cpu(hdr->seq_ctrl);
946 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 947 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 948 skb_queue_tail(&rx->sdata->skb_queue, skb);
949 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 950 return;
1edfb1af
JB		 951 }
952
a87f736d
JB		 953 /*
954 * No locking needed -- we will only ever process one
955 * RX packet at a time, and thus own tid_agg_rx. All
956 * other code manipulating it needs to (and does) make
957 * sure that we cannot get to it any more before doing
958 * anything with it.
959 */
f9e124fb
CL		 960 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
961 frames))
2569a826
JB		 962 return;
963
964 dont_reorder:
f9e124fb 965 __skb_queue_tail(frames, skb);
1edfb1af 966}
33b64eb2 967
49461622 968static ieee80211_rx_result debug_noinline
5cf121c3 969ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 970{
a7767f95 971 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 972 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 973
974 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
975 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 976 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 977 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 978 hdr->seq_ctrl)) {
554891e6 979 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 980 rx->local->dot11FrameDuplicateCount++;
981 rx->sta->num_duplicates++;
982 }
b1f93314 983 return RX_DROP_UNUSABLE;
571ecf67 984 } else
9e26297a 985 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 986 }
987
571ecf67
JB		 988 if (unlikely(rx->skb->len < 16)) {
989 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 990 return RX_DROP_MONITOR;
571ecf67
JB		 991 }
992
571ecf67
JB		 993 /* Drop disallowed frame classes based on STA auth/assoc state;
994 * IEEE 802.11, Chap 5.5.
995 *
ccd7b362
JB		 996 * mac80211 filters only based on association state, i.e. it drops
997 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 998 * deauth/disassoc frames when needed. In addition, hostapd is
999 * responsible for filtering on both auth and assoc states.
1000 */
33b64eb2 1001
902acc78 1002 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1003 return ieee80211_rx_mesh_check(rx);
33b64eb2 1004
a7767f95
HH		 1005 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1006 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1007 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1008 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 1009 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1010 /*
1011 * accept port control frames from the AP even when it's not
1012 * yet marked ASSOC to prevent a race where we don't set the
1013 * assoc bit quickly enough before it sends the first frame
1014 */
1015 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1016 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1017 unsigned int hdrlen;
1018 __be16 ethertype;
1019
1020 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1021
1022 if (rx->skb->len < hdrlen + 8)
1023 return RX_DROP_MONITOR;
1024
1025 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1026 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1027 return RX_CONTINUE;
1028 }
21fc7560
JB		 1029
1030 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1031 cfg80211_rx_spurious_frame(rx->sdata->dev,
1032 hdr->addr2,
1033 GFP_ATOMIC))
1034 return RX_DROP_UNUSABLE;
1035
e4c26add 1036 return RX_DROP_MONITOR;
2a33bee2 1037 }
571ecf67 1038
9ae54c84 1039 return RX_CONTINUE;
570bd537
JB		 1040}
1041
1042
49461622 1043static ieee80211_rx_result debug_noinline
5cf121c3 1044ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 1045{
eb9fb5b8
JB		 1046 struct sk_buff *skb = rx->skb;
1047 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 1049 int keyidx;
1050 int hdrlen;
e4c26add 1051 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 1052 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 1053 int mmie_keyidx = -1;
761ab470 1054 __le16 fc;
570bd537 1055
3017b80b
JB		 1056 /*
1057 * Key selection 101
1058 *
3cfcf6ac 1059 * There are four types of keys:
3017b80b 1060 * - GTK (group keys)
3cfcf6ac 1061 * - IGTK (group keys for management frames)
3017b80b
JB		 1062 * - PTK (pairwise keys)
1063 * - STK (station-to-station pairwise keys)
1064 *
1065 * When selecting a key, we have to distinguish between multicast
1066 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 1067 * use PTKs and STKs while the former always use GTKs and IGTKs.
1068 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1069 * unicast frames can also use key indices like GTKs. Hence, if we
1070 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 1071 *
8dc06a1c
JB		 1072 * Note that in a regular BSS, multicast frames are sent by the
1073 * AP only, associated stations unicast the frame to the AP first
1074 * which then multicasts it on their behalf.
1075 *
3017b80b
JB		 1076 * There is also a slight problem in IBSS mode: GTKs are negotiated
1077 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 1078 * The spec seems to expect that one negotiates the same key with
1079 * every station but there's no such requirement; VLANs could be
1080 * possible.
3017b80b
JB		 1081 */
1082
3017b80b 1083 /*
1990af8d 1084 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 1085 * addressed to us nor a multicast frame.
1086 */
554891e6 1087 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1088 return RX_CONTINUE;
3017b80b 1089
2569a826
JB		 1090 /* start without a key */
1091 rx->key = NULL;
1092
d4e46a3d 1093 if (rx->sta)
e31b8213 1094 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 1095
761ab470
JB		 1096 fc = hdr->frame_control;
1097
1098 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 1099 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1100
e31b8213
JB		 1101 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1102 rx->key = sta_ptk;
dc1580dd
JB		 1103 if ((status->flag & RX_FLAG_DECRYPTED) &&
1104 (status->flag & RX_FLAG_IV_STRIPPED))
1105 return RX_CONTINUE;
0c7c10c7 1106 /* Skip decryption if the frame is not protected. */
761ab470 1107 if (!ieee80211_has_protected(fc))
0c7c10c7 1108 return RX_CONTINUE;
3cfcf6ac
JM		 1109 } else if (mmie_keyidx >= 0) {
1110 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 1111 if ((status->flag & RX_FLAG_DECRYPTED) &&
1112 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 1113 return RX_CONTINUE;
1114
1115 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1116 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1117 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 1118 if (rx->sta)
1119 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1120 if (!rx->key)
1121 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 1122 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 1123 /*
1124 * The frame was not protected, so skip decryption. However, we
1125 * need to set rx->key if there is a key that could have been
1126 * used so that the frame may be dropped if encryption would
1127 * have been expected.
1128 */
1129 struct ieee80211_key *key = NULL;
897bed8b
JB		 1130 struct ieee80211_sub_if_data *sdata = rx->sdata;
1131 int i;
1132
761ab470 1133 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1134 is_multicast_ether_addr(hdr->addr1) &&
1135 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1136 rx->key = key;
897bed8b
JB		 1137 else {
1138 if (rx->sta) {
1139 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1140 key = rcu_dereference(rx->sta->gtk[i]);
1141 if (key)
1142 break;
1143 }
1144 }
1145 if (!key) {
1146 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1147 key = rcu_dereference(sdata->keys[i]);
1148 if (key)
1149 break;
1150 }
1151 }
1152 if (key)
1153 rx->key = key;
1154 }
0c7c10c7 1155 return RX_CONTINUE;
571ecf67 1156 } else {
39184b15 1157 u8 keyid;
3017b80b
JB		 1158 /*
1159 * The device doesn't give us the IV so we won't be
1160 * able to look up the key. That's ok though, we
1161 * don't need to decrypt the frame, we just won't
1162 * be able to keep statistics accurate.
1163 * Except for key threshold notifications, should
1164 * we somehow allow the driver to tell us which key
1165 * the hardware used if this flag is set?
1166 */
eb9fb5b8
JB		 1167 if ((status->flag & RX_FLAG_DECRYPTED) &&
1168 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1169 return RX_CONTINUE;
3017b80b 1170
761ab470 1171 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1172
1173 if (rx->skb->len < 8 + hdrlen)
e4c26add 1174 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1175
1176 /*
1177 * no need to call ieee80211_wep_get_keyidx,
1178 * it verifies a bunch of things we've done already
1179 */
39184b15
ZY		 1180 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1181 keyidx = keyid >> 6;
3017b80b 1182
e31b8213
JB		 1183 /* check per-station GTK first, if multicast packet */
1184 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1185 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1186
e31b8213
JB		 1187 /* if not found, try default key */
1188 if (!rx->key) {
1189 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1190
1191 /*
1192 * RSNA-protected unicast frames should always be
1193 * sent with pairwise or station-to-station keys,
1194 * but for WEP we allow using a key index as well.
1195 */
1196 if (rx->key &&
1197 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1198 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1199 !is_multicast_ether_addr(hdr->addr1))
1200 rx->key = NULL;
1201 }
571ecf67
JB		 1202 }
1203
3017b80b 1204 if (rx->key) {
95acac61
JB		 1205 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1206 return RX_DROP_MONITOR;
1207
571ecf67 1208 rx->key->tx_rx_count++;
011bfcc4 1209 /* TODO: add threshold stuff again */
1990af8d 1210 } else {
e4c26add 1211 return RX_DROP_MONITOR;
70f08765
JB		 1212 }
1213
97359d12
JB		 1214 switch (rx->key->conf.cipher) {
1215 case WLAN_CIPHER_SUITE_WEP40:
1216 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1217 result = ieee80211_crypto_wep_decrypt(rx);
1218 break;
97359d12 1219 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1220 result = ieee80211_crypto_tkip_decrypt(rx);
1221 break;
97359d12 1222 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1223 result = ieee80211_crypto_ccmp_decrypt(rx);
1224 break;
97359d12 1225 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1226 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1227 break;
3ffc2a90
JB		 1228 default:
1229 /*
1230 * We can reach here only with HW-only algorithms
1231 * but why didn't it decrypt the frame?!
1232 */
1233 return RX_DROP_UNUSABLE;
70f08765
JB		 1234 }
1235
a8286911
JB		 1236 /* the hdr variable is invalid after the decrypt handlers */
1237
e2f036da 1238 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1239 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1240
1241 return result;
70f08765
JB		 1242}
1243
572e0012
KV		 1244static ieee80211_rx_result debug_noinline
1245ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1246{
1247 struct ieee80211_local *local;
1248 struct ieee80211_hdr *hdr;
1249 struct sk_buff *skb;
1250
1251 local = rx->local;
1252 skb = rx->skb;
1253 hdr = (struct ieee80211_hdr *) skb->data;
1254
1255 if (!local->pspolling)
1256 return RX_CONTINUE;
1257
1258 if (!ieee80211_has_fromds(hdr->frame_control))
1259 /* this is not from AP */
1260 return RX_CONTINUE;
1261
1262 if (!ieee80211_is_data(hdr->frame_control))
1263 return RX_CONTINUE;
1264
1265 if (!ieee80211_has_moredata(hdr->frame_control)) {
1266 /* AP has no more frames buffered for us */
1267 local->pspolling = false;
1268 return RX_CONTINUE;
1269 }
1270
1271 /* more data bit is set, let's request a new frame from the AP */
1272 ieee80211_send_pspoll(local, rx->sdata);
1273
1274 return RX_CONTINUE;
1275}
1276
d012a605 1277static void sta_ps_start(struct sta_info *sta)
571ecf67 1278{
133b8226 1279 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1280 struct ieee80211_local *local = sdata->local;
d012a605 1281 struct ps_data *ps;
0795af57 1282
d012a605
MP		 1283 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1284 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1285 ps = &sdata->bss->ps;
1286 else
1287 return;
1288
1289 atomic_inc(&ps->num_sta_ps);
c2c98fde 1290 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1291 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1292 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1293 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1294 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1295}
1296
d012a605 1297static void sta_ps_end(struct sta_info *sta)
571ecf67 1298{
bdcbd8e0
JB		 1299 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1300 sta->sta.addr, sta->sta.aid);
004c872e 1301
c2c98fde 1302 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1303 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1304 sta->sta.addr, sta->sta.aid);
af818581
JB		 1305 return;
1306 }
1307
1308 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1309}
1310
d057e5a3
AN		 1311int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1312{
1313 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1314 bool in_ps;
1315
1316 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1317
1318 /* Don't let the same PS state be set twice */
c2c98fde 1319 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1320 if ((start && in_ps) || (!start && !in_ps))
1321 return -EINVAL;
1322
1323 if (start)
d012a605 1324 sta_ps_start(sta_inf);
d057e5a3 1325 else
d012a605 1326 sta_ps_end(sta_inf);
d057e5a3
AN		 1327
1328 return 0;
1329}
1330EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1331
47086fc5
JB		 1332static ieee80211_rx_result debug_noinline
1333ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1334{
1335 struct ieee80211_sub_if_data *sdata = rx->sdata;
1336 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1337 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1338 int tid, ac;
1339
1340 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1341 return RX_CONTINUE;
1342
1343 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1344 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1345 return RX_CONTINUE;
1346
1347 /*
1348 * The device handles station powersave, so don't do anything about
1349 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1350 * it to mac80211 since they're handled.)
1351 */
1352 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1353 return RX_CONTINUE;
1354
1355 /*
1356 * Don't do anything if the station isn't already asleep. In
1357 * the uAPSD case, the station will probably be marked asleep,
1358 * in the PS-Poll case the station must be confused ...
1359 */
c2c98fde 1360 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1361 return RX_CONTINUE;
1362
1363 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1364 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1365 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1366 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1367 else
c2c98fde 1368 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1369 }
47086fc5
JB		 1370
1371 /* Free PS Poll skb here instead of returning RX_DROP that would
1372 * count as an dropped frame. */
1373 dev_kfree_skb(rx->skb);
1374
1375 return RX_QUEUED;
1376 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1377 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1378 ieee80211_has_pm(hdr->frame_control) &&
1379 (ieee80211_is_data_qos(hdr->frame_control) ||
1380 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1381 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1382 ac = ieee802_1d_to_ac[tid & 7];
1383
1384 /*
1385 * If this AC is not trigger-enabled do nothing.
1386 *
1387 * NB: This could/should check a separate bitmap of trigger-
1388 * enabled queues, but for now we only implement uAPSD w/o
1389 * TSPEC changes to the ACs, so they're always the same.
1390 */
1391 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1392 return RX_CONTINUE;
1393
1394 /* if we are in a service period, do nothing */
c2c98fde 1395 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1396 return RX_CONTINUE;
1397
c2c98fde 1398 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1399 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1400 else
c2c98fde 1401 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1402 }
1403
1404 return RX_CONTINUE;
1405}
1406
49461622 1407static ieee80211_rx_result debug_noinline
5cf121c3 1408ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1409{
1410 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1411 struct sk_buff *skb = rx->skb;
1412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1414 int i;
571ecf67
JB		 1415
1416 if (!sta)
9ae54c84 1417 return RX_CONTINUE;
571ecf67 1418
b291ba11
JB		 1419 /*
1420 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1421 * BSSID and for station already AUTHORIZED to avoid keeping the
1422 * current IBSS network alive in cases where other STAs start
1423 * using different BSSID. This will also give the station another
1424 * chance to restart the authentication/authorization in case
1425 * something went wrong the first time.
b291ba11 1426 */
05c914fe 1427 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1428 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1429 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1430 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1431 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1432 sta->last_rx = jiffies;
3af6334c
FF		 1433 if (ieee80211_is_data(hdr->frame_control)) {
1434 sta->last_rx_rate_idx = status->rate_idx;
1435 sta->last_rx_rate_flag = status->flag;
5614618e 1436 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1437 }
1438 }
b291ba11
JB		 1439 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1440 /*
33b64eb2
LCC		 1441 * Mesh beacons will update last_rx when if they are found to
1442 * match the current local configuration when processed.
571ecf67 1443 */
b291ba11 1444 sta->last_rx = jiffies;
3af6334c
FF		 1445 if (ieee80211_is_data(hdr->frame_control)) {
1446 sta->last_rx_rate_idx = status->rate_idx;
1447 sta->last_rx_rate_flag = status->flag;
5614618e 1448 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1449 }
571ecf67
JB		 1450 }
1451
554891e6 1452 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1453 return RX_CONTINUE;
571ecf67 1454
3cf335d5
KV		 1455 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1456 ieee80211_sta_rx_notify(rx->sdata, hdr);
1457
571ecf67
JB		 1458 sta->rx_fragments++;
1459 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1460 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1461 sta->last_signal = status->signal;
1462 ewma_add(&sta->avg_signal, -status->signal);
1463 }
571ecf67 1464
ef0621e8
FF		 1465 if (status->chains) {
1466 sta->chains = status->chains;
1467 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1468 int signal = status->chain_signal[i];
1469
1470 if (!(status->chains & BIT(i)))
1471 continue;
1472
1473 sta->chain_signal_last[i] = signal;
1474 ewma_add(&sta->chain_signal_avg[i], -signal);
1475 }
1476 }
1477
72eaa43a
JB		 1478 /*
1479 * Change STA power saving mode only at the end of a frame
1480 * exchange sequence.
1481 */
d057e5a3
AN		 1482 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1483 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1484 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1485 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1486 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1487 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1488 /*
1489 * Ignore doze->wake transitions that are
1490 * indicated by non-data frames, the standard
1491 * is unclear here, but for example going to
1492 * PS mode and then scanning would cause a
1493 * doze->wake transition for the probe request,
1494 * and that is clearly undesirable.
1495 */
1496 if (ieee80211_is_data(hdr->frame_control) &&
1497 !ieee80211_has_pm(hdr->frame_control))
d012a605 1498 sta_ps_end(sta);
72eaa43a
JB		 1499 } else {
1500 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1501 sta_ps_start(sta);
72eaa43a 1502 }
571ecf67
JB		 1503 }
1504
3f52b7e3
MP		 1505 /* mesh power save support */
1506 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1507 ieee80211_mps_rx_h_sta_process(sta, hdr);
1508
22403def
JB		 1509 /*
1510 * Drop (qos-)data::nullfunc frames silently, since they
1511 * are used only to control station power saving mode.
1512 */
1513 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1514 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1515 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1516
1517 /*
1518 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1519 * that was not moved to a 4-addr STA vlan yet send
1520 * the event to userspace and for older hostapd drop
1521 * the frame to the monitor interface.
d524215f
FF		 1522 */
1523 if (ieee80211_has_a4(hdr->frame_control) &&
1524 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1525 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1526 !rx->sdata->u.vlan.sta))) {
1527 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1528 cfg80211_rx_unexpected_4addr_frame(
1529 rx->sdata->dev, sta->sta.addr,
1530 GFP_ATOMIC);
d524215f 1531 return RX_DROP_MONITOR;
e7f4a940 1532 }
22403def
JB		 1533 /*
1534 * Update counter and free packet here to avoid
1535 * counting this as a dropped packed.
1536 */
571ecf67
JB		 1537 sta->rx_packets++;
1538 dev_kfree_skb(rx->skb);
9ae54c84 1539 return RX_QUEUED;
571ecf67
JB		 1540 }
1541
9ae54c84 1542 return RX_CONTINUE;
571ecf67
JB		 1543} /* ieee80211_rx_h_sta_process */
1544
571ecf67
JB		 1545static inline struct ieee80211_fragment_entry *
1546ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1547 unsigned int frag, unsigned int seq, int rx_queue,
1548 struct sk_buff **skb)
1549{
1550 struct ieee80211_fragment_entry *entry;
571ecf67 1551
571ecf67
JB		 1552 entry = &sdata->fragments[sdata->fragment_next++];
1553 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1554 sdata->fragment_next = 0;
1555
bdcbd8e0 1556 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1557 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1558
1559 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1560 *skb = NULL;
1561 entry->first_frag_time = jiffies;
1562 entry->seq = seq;
1563 entry->rx_queue = rx_queue;
1564 entry->last_frag = frag;
1565 entry->ccmp = 0;
1566 entry->extra_len = 0;
1567
1568 return entry;
1569}
1570
1571static inline struct ieee80211_fragment_entry *
1572ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1573 unsigned int frag, unsigned int seq,
571ecf67
JB		 1574 int rx_queue, struct ieee80211_hdr *hdr)
1575{
1576 struct ieee80211_fragment_entry *entry;
1577 int i, idx;
1578
1579 idx = sdata->fragment_next;
1580 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1581 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1582
1583 idx--;
1584 if (idx < 0)
1585 idx = IEEE80211_FRAGMENT_MAX - 1;
1586
1587 entry = &sdata->fragments[idx];
1588 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1589 entry->rx_queue != rx_queue ||
1590 entry->last_frag + 1 != frag)
1591 continue;
1592
b73d70ad 1593 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1594
b73d70ad
HH		 1595 /*
1596 * Check ftype and addresses are equal, else check next fragment
1597 */
1598 if (((hdr->frame_control ^ f_hdr->frame_control) &
1599 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1600 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1601 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1602 continue;
1603
ab46623e 1604 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1605 __skb_queue_purge(&entry->skb_list);
1606 continue;
1607 }
1608 return entry;
1609 }
1610
1611 return NULL;
1612}
1613
49461622 1614static ieee80211_rx_result debug_noinline
5cf121c3 1615ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1616{
1617 struct ieee80211_hdr *hdr;
1618 u16 sc;
358c8d9d 1619 __le16 fc;
571ecf67
JB		 1620 unsigned int frag, seq;
1621 struct ieee80211_fragment_entry *entry;
1622 struct sk_buff *skb;
554891e6 1623 struct ieee80211_rx_status *status;
571ecf67 1624
b73d70ad 1625 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1626 fc = hdr->frame_control;
f7fbf70e
JC		 1627
1628 if (ieee80211_is_ctl(fc))
1629 return RX_CONTINUE;
1630
571ecf67
JB		 1631 sc = le16_to_cpu(hdr->seq_ctrl);
1632 frag = sc & IEEE80211_SCTL_FRAG;
1633
358c8d9d 1634 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1635 is_multicast_ether_addr(hdr->addr1))) {
1636 /* not fragmented */
1637 goto out;
1638 }
1639 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1640
e3cf8b3f
ZY		 1641 if (skb_linearize(rx->skb))
1642 return RX_DROP_UNUSABLE;
1643
058897a4
AK		 1644 /*
1645 * skb_linearize() might change the skb->data and
1646 * previously cached variables (in this case, hdr) need to
1647 * be refreshed with the new data.
1648 */
1649 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1650 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1651
1652 if (frag == 0) {
1653 /* This is the first fragment of a new frame. */
1654 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1655 rx->seqno_idx, &(rx->skb));
97359d12 1656 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1657 ieee80211_has_protected(fc)) {
9e26297a 1658 int queue = rx->security_idx;
571ecf67
JB		 1659 /* Store CCMP PN so that we can verify that the next
1660 * fragment has a sequential PN value. */
1661 entry->ccmp = 1;
1662 memcpy(entry->last_pn,
9190252c 1663 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1664 IEEE80211_CCMP_PN_LEN);
571ecf67 1665 }
9ae54c84 1666 return RX_QUEUED;
571ecf67
JB		 1667 }
1668
1669 /* This is a fragment for a frame that should already be pending in
1670 * fragment cache. Add this fragment to the end of the pending entry.
1671 */
9e26297a
JB		 1672 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1673 rx->seqno_idx, hdr);
571ecf67
JB		 1674 if (!entry) {
1675 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1676 return RX_DROP_MONITOR;
571ecf67
JB		 1677 }
1678
1679 /* Verify that MPDUs within one MSDU have sequential PN values.
1680 * (IEEE 802.11i, 8.3.3.4.5) */
1681 if (entry->ccmp) {
1682 int i;
4325f6ca 1683 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1684 int queue;
97359d12 1685 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1686 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1687 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1688 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1689 pn[i]++;
1690 if (pn[i])
1691 break;
1692 }
9e26297a 1693 queue = rx->security_idx;
9190252c 1694 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1695 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1696 return RX_DROP_UNUSABLE;
4325f6ca 1697 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1698 }
1699
358c8d9d 1700 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1701 __skb_queue_tail(&entry->skb_list, rx->skb);
1702 entry->last_frag = frag;
1703 entry->extra_len += rx->skb->len;
358c8d9d 1704 if (ieee80211_has_morefrags(fc)) {
571ecf67 1705 rx->skb = NULL;
9ae54c84 1706 return RX_QUEUED;
571ecf67
JB		 1707 }
1708
1709 rx->skb = __skb_dequeue(&entry->skb_list);
1710 if (skb_tailroom(rx->skb) < entry->extra_len) {
1711 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1712 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1713 GFP_ATOMIC))) {
1714 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1715 __skb_queue_purge(&entry->skb_list);
e4c26add 1716 return RX_DROP_UNUSABLE;
571ecf67
JB		 1717 }
1718 }
1719 while ((skb = __skb_dequeue(&entry->skb_list))) {
1720 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1721 dev_kfree_skb(skb);
1722 }
1723
1724 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1725 status = IEEE80211_SKB_RXCB(rx->skb);
1726 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1727
1728 out:
1729 if (rx->sta)
1730 rx->sta->rx_packets++;
1731 if (is_multicast_ether_addr(hdr->addr1))
1732 rx->local->dot11MulticastReceivedFrameCount++;
1733 else
1734 ieee80211_led_rx(rx->local);
9ae54c84 1735 return RX_CONTINUE;
571ecf67
JB		 1736}
1737
1df332e8 1738static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1739{
1df332e8 1740 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1741 return -EACCES;
571ecf67 1742
76ee65bf 1743 return 0;
571ecf67
JB		 1744}
1745
1df332e8 1746static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1747{
eb9fb5b8
JB		 1748 struct sk_buff *skb = rx->skb;
1749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1750
3017b80b 1751 /*
7848ba7d
JB		 1752 * Pass through unencrypted frames if the hardware has
1753 * decrypted them already.
3017b80b 1754 */
eb9fb5b8 1755 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1756 return 0;
571ecf67
JB		 1757
1758 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1759 if (unlikely(!ieee80211_has_protected(fc) &&
1760 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1761 ieee80211_is_data(fc) &&
b3fc9c6c 1762 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1763 return -EACCES;
bef5d1c7
JB		 1764
1765 return 0;
1766}
1767
1df332e8 1768static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1769{
1770 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1771 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1772 __le16 fc = hdr->frame_control;
bef5d1c7 1773
e3efca0a
JM		 1774 /*
1775 * Pass through unencrypted frames if the hardware has
1776 * decrypted them already.
1777 */
1778 if (status->flag & RX_FLAG_DECRYPTED)
1779 return 0;
bef5d1c7 1780
c2c98fde 1781 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1782 if (unlikely(!ieee80211_has_protected(fc) &&
1783 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1784 rx->key)) {
6ff57cf8
JB		 1785 if (ieee80211_is_deauth(fc) ||
1786 ieee80211_is_disassoc(fc))
1787 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1788 rx->skb->data,
1789 rx->skb->len);
f2ca3ea4 1790 return -EACCES;
cf4e594e 1791 }
f2ca3ea4 1792 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1793 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1794 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1795 if (ieee80211_is_deauth(fc) ||
1796 ieee80211_is_disassoc(fc))
1797 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1798 rx->skb->data,
1799 rx->skb->len);
f2ca3ea4 1800 return -EACCES;
cf4e594e 1801 }
f2ca3ea4
JM		 1802 /*
1803 * When using MFP, Action frames are not allowed prior to
1804 * having configured keys.
1805 */
1806 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1807 ieee80211_is_robust_mgmt_frame(
1808 (struct ieee80211_hdr *) rx->skb->data)))
1809 return -EACCES;
1810 }
b3fc9c6c 1811
76ee65bf 1812 return 0;
571ecf67
JB		 1813}
1814
76ee65bf 1815static int
4114fa21 1816__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1817{
eb9fb5b8 1818 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1820 bool check_port_control = false;
1821 struct ethhdr *ehdr;
1822 int ret;
f14543ee 1823
4114fa21 1824 *port_control = false;
9bc383de
JB		 1825 if (ieee80211_has_a4(hdr->frame_control) &&
1826 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1827 return -1;
9bc383de 1828
fbb327c5
FF		 1829 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1830 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1831
1832 if (!sdata->u.mgd.use_4addr)
1833 return -1;
1834 else
1835 check_port_control = true;
1836 }
1837
9bc383de 1838 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1839 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1840 return -1;
571ecf67 1841
fbb327c5 1842 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1843 if (ret < 0)
fbb327c5
FF		 1844 return ret;
1845
1846 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1847 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1848 *port_control = true;
1849 else if (check_port_control)
fbb327c5
FF		 1850 return -1;
1851
1852 return 0;
76ee65bf 1853}
571ecf67 1854
ce3edf6d
JB		 1855/*
1856 * requires that rx->skb is a frame with ethernet header
1857 */
358c8d9d 1858static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1859{
c97c23e3 1860 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1861 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1862 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1863
1864 /*
1865 * Allow EAPOL frames to us/the PAE group address regardless
1866 * of whether the frame was encrypted or not.
1867 */
a621fa4d 1868 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1869 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1870 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1871 return true;
1872
1873 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1874 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1875 return false;
1876
1877 return true;
1878}
1879
1880/*
1881 * requires that rx->skb is a frame with ethernet header
1882 */
76ee65bf 1883static void
5cf121c3 1884ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1885{
eb9fb5b8
JB		 1886 struct ieee80211_sub_if_data *sdata = rx->sdata;
1887 struct net_device *dev = sdata->dev;
76ee65bf 1888 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1889 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1890 struct sta_info *dsta;
554891e6 1891 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1892
76ee65bf
RR		 1893 skb = rx->skb;
1894 xmit_skb = NULL;
571ecf67 1895
05c914fe
JB		 1896 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1897 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1898 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1899 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1900 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1901 if (is_multicast_ether_addr(ehdr->h_dest)) {
1902 /*
1903 * send multicast frames both to higher layers in
1904 * local net stack and back to the wireless medium
1905 */
76ee65bf 1906 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1907 if (!xmit_skb)
bdcbd8e0 1908 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1909 dev->name);
571ecf67 1910 } else {
abe60632
JB		 1911 dsta = sta_info_get(sdata, skb->data);
1912 if (dsta) {
ce3edf6d
JB		 1913 /*
1914 * The destination station is associated to
1915 * this AP (in this VLAN), so send the frame
1916 * directly to it and do not pass it to local
1917 * net stack.
571ecf67 1918 */
76ee65bf 1919 xmit_skb = skb;
571ecf67
JB		 1920 skb = NULL;
1921 }
571ecf67
JB		 1922 }
1923 }
1924
1925 if (skb) {
d1c3a37c
JB		 1926 int align __maybe_unused;
1927
59d9cb07 1928#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1929 /*
1930 * 'align' will only take the values 0 or 2 here
1931 * since all frames are required to be aligned
1932 * to 2-byte boundaries when being passed to
191922cd
JB		 1933 * mac80211; the code here works just as well if
1934 * that isn't true, but mac80211 assumes it can
1935 * access fields as 2-byte aligned (e.g. for
1936 * compare_ether_addr)
d1c3a37c 1937 */
dacb6f1d 1938 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1939 if (align) {
1940 if (WARN_ON(skb_headroom(skb) < 3)) {
1941 dev_kfree_skb(skb);
1942 skb = NULL;
1943 } else {
1944 u8 *data = skb->data;
8ce0b589
ZY		 1945 size_t len = skb_headlen(skb);
1946 skb->data -= align;
1947 memmove(skb->data, data, len);
1948 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1949 }
1950 }
1951#endif
1952
1953 if (skb) {
1954 /* deliver to local stack */
1955 skb->protocol = eth_type_trans(skb, dev);
1956 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1957 netif_receive_skb(skb);
d1c3a37c 1958 }
571ecf67
JB		 1959 }
1960
76ee65bf 1961 if (xmit_skb) {
aef6c928
HS		 1962 /*
1963 * Send to wireless media and increase priority by 256 to
1964 * keep the received priority instead of reclassifying
1965 * the frame (see cfg80211_classify8021d).
1966 */
1967 xmit_skb->priority += 256;
f831e909 1968 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1969 skb_reset_network_header(xmit_skb);
1970 skb_reset_mac_header(xmit_skb);
76ee65bf 1971 dev_queue_xmit(xmit_skb);
571ecf67 1972 }
76ee65bf
RR		 1973}
1974
49461622 1975static ieee80211_rx_result debug_noinline
5cf121c3 1976ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1977{
eb9fb5b8 1978 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1979 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1980 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1981 __le16 fc = hdr->frame_control;
eaf85ca7 1982 struct sk_buff_head frame_list;
554891e6 1983 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1984
358c8d9d 1985 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1986 return RX_CONTINUE;
fd4c7f2f 1987
358c8d9d 1988 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1989 return RX_DROP_MONITOR;
fd4c7f2f 1990
554891e6 1991 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1992 return RX_CONTINUE;
fd4c7f2f 1993
eaf85ca7
ZY		 1994 if (ieee80211_has_a4(hdr->frame_control) &&
1995 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1996 !rx->sdata->u.vlan.sta)
e4c26add 1997 return RX_DROP_UNUSABLE;
fd4c7f2f 1998
eaf85ca7
ZY		 1999 if (is_multicast_ether_addr(hdr->addr1) &&
2000 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2001 rx->sdata->u.vlan.sta) ||
2002 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2003 rx->sdata->u.mgd.use_4addr)))
e4c26add 2004 return RX_DROP_UNUSABLE;
fd4c7f2f 2005
eaf85ca7
ZY		 2006 skb->dev = dev;
2007 __skb_queue_head_init(&frame_list);
fd4c7f2f 2008
e3cf8b3f
ZY		 2009 if (skb_linearize(skb))
2010 return RX_DROP_UNUSABLE;
2011
eaf85ca7
ZY		 2012 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2013 rx->sdata->vif.type,
8b3becad 2014 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2015
eaf85ca7
ZY		 2016 while (!skb_queue_empty(&frame_list)) {
2017 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2018
358c8d9d 2019 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2020 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2021 continue;
2022 }
eaf85ca7
ZY		 2023 dev->stats.rx_packets++;
2024 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2025
2026 ieee80211_deliver_skb(rx);
2027 }
2028
9ae54c84 2029 return RX_QUEUED;
fd4c7f2f
RR		 2030}
2031
bf94e17b 2032#ifdef CONFIG_MAC80211_MESH
b0dee578 2033static ieee80211_rx_result
e32f85f7
LCC		 2034ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2035{
30789eb6
TP		 2036 struct ieee80211_hdr *fwd_hdr, *hdr;
2037 struct ieee80211_tx_info *info;
e32f85f7 2038 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2039 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2040 struct ieee80211_local *local = rx->local;
eb9fb5b8 2041 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2042 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2043 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 2044 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 2045 u16 q, hdrlen;
e32f85f7
LCC		 2046
2047 hdr = (struct ieee80211_hdr *) skb->data;
2048 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2049
2050 /* make sure fixed part of mesh header is there, also checks skb len */
2051 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2052 return RX_DROP_MONITOR;
2053
2054 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2055
2056 /* make sure full mesh header is there, also checks skb len */
2057 if (!pskb_may_pull(rx->skb,
2058 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2059 return RX_DROP_MONITOR;
2060
2061 /* reload pointers */
2062 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2063 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2064
2157fdd6
TP		 2065 /* frame is in RMC, don't forward */
2066 if (ieee80211_is_data(hdr->frame_control) &&
2067 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2068 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2069 return RX_DROP_MONITOR;
2070
555cb715
JC		 2071 if (!ieee80211_is_data(hdr->frame_control) ||
2072 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2073 return RX_CONTINUE;
2074
2075 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2076 return RX_DROP_MONITOR;
2077
43b7b314 2078 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2079 struct mesh_path *mppath;
43b7b314
JC		 2080 char *proxied_addr;
2081 char *mpp_addr;
2082
2083 if (is_multicast_ether_addr(hdr->addr1)) {
2084 mpp_addr = hdr->addr3;
2085 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2086 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2087 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2088 mpp_addr = hdr->addr4;
2089 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2090 } else {
2091 return RX_DROP_MONITOR;
43b7b314 2092 }
79617dee 2093
79617dee 2094 rcu_read_lock();
bf7cd94d 2095 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2096 if (!mppath) {
bf7cd94d 2097 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2098 } else {
2099 spin_lock_bh(&mppath->state_lock);
b203ca39 2100 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2101 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2102 spin_unlock_bh(&mppath->state_lock);
2103 }
2104 rcu_read_unlock();
2105 }
2106
3c5772a5
JC		 2107 /* Frame has reached destination. Don't forward */
2108 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2109 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2110 return RX_CONTINUE;
2111
00e96dec 2112 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2113 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2114 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2115 return RX_DROP_MONITOR;
2116 }
2117 skb_set_queue_mapping(skb, q);
e32f85f7 2118
30789eb6
TP		 2119 if (!--mesh_hdr->ttl) {
2120 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2121 goto out;
30789eb6
TP		 2122 }
2123
d665508b
CYY		 2124 if (!ifmsh->mshcfg.dot11MeshForwarding)
2125 goto out;
2126
30789eb6
TP		 2127 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2128 if (!fwd_skb) {
bdcbd8e0 2129 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2130 sdata->name);
30789eb6
TP		 2131 goto out;
2132 }
2133
2134 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2135 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2136 info = IEEE80211_SKB_CB(fwd_skb);
2137 memset(info, 0, sizeof(*info));
2138 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2139 info->control.vif = &rx->sdata->vif;
2140 info->control.jiffies = jiffies;
2141 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2142 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2143 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2144 /* update power mode indication when forwarding */
2145 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2146 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2147 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2148 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2149 } else {
2150 /* unable to resolve next hop */
bf7cd94d
JB		 2151 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2152 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
30789eb6 2153 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2154 kfree_skb(fwd_skb);
30789eb6 2155 return RX_DROP_MONITOR;
e32f85f7
LCC		 2156 }
2157
30789eb6
TP		 2158 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2159 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2160 out:
3c5772a5 2161 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2162 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2163 return RX_CONTINUE;
2164 else
2165 return RX_DROP_MONITOR;
2166}
bf94e17b 2167#endif
e32f85f7 2168
49461622 2169static ieee80211_rx_result debug_noinline
5cf121c3 2170ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2171{
eb9fb5b8 2172 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2173 struct ieee80211_local *local = rx->local;
eb9fb5b8 2174 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2175 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2176 __le16 fc = hdr->frame_control;
4114fa21 2177 bool port_control;
ce3edf6d 2178 int err;
76ee65bf 2179
358c8d9d 2180 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2181 return RX_CONTINUE;
76ee65bf 2182
358c8d9d 2183 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2184 return RX_DROP_MONITOR;
76ee65bf 2185
f14543ee 2186 /*
e7f4a940
JB		 2187 * Send unexpected-4addr-frame event to hostapd. For older versions,
2188 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2189 */
2190 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2191 sdata->vif.type == NL80211_IFTYPE_AP) {
2192 if (rx->sta &&
2193 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2194 cfg80211_rx_unexpected_4addr_frame(
2195 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2196 return RX_DROP_MONITOR;
e7f4a940 2197 }
f14543ee 2198
4114fa21 2199 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2200 if (unlikely(err))
e4c26add 2201 return RX_DROP_UNUSABLE;
76ee65bf 2202
358c8d9d 2203 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2204 return RX_DROP_MONITOR;
ce3edf6d 2205
4114fa21
FF		 2206 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2207 unlikely(port_control) && sdata->bss) {
2208 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2209 u.ap);
2210 dev = sdata->dev;
2211 rx->sdata = sdata;
2212 }
2213
76ee65bf
RR		 2214 rx->skb->dev = dev;
2215
2216 dev->stats.rx_packets++;
2217 dev->stats.rx_bytes += rx->skb->len;
2218
08ca944e 2219 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2220 !is_multicast_ether_addr(
2221 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2222 (!local->scanning &&
2223 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2224 mod_timer(&local->dynamic_ps_timer, jiffies +
2225 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2226 }
2227
76ee65bf 2228 ieee80211_deliver_skb(rx);
571ecf67 2229
9ae54c84 2230 return RX_QUEUED;
571ecf67
JB		 2231}
2232
49461622 2233static ieee80211_rx_result debug_noinline
f9e124fb 2234ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2235{
71364716 2236 struct sk_buff *skb = rx->skb;
a7767f95 2237 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2238 struct tid_ampdu_rx *tid_agg_rx;
2239 u16 start_seq_num;
2240 u16 tid;
2241
a7767f95 2242 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2243 return RX_CONTINUE;
71364716 2244
a7767f95 2245 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2246 struct {
2247 __le16 control, start_seq_num;
2248 } __packed bar_data;
2249
71364716 2250 if (!rx->sta)
a02ae758 2251 return RX_DROP_MONITOR;
8ae5977f
JB		 2252
2253 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2254 &bar_data, sizeof(bar_data)))
2255 return RX_DROP_MONITOR;
2256
8ae5977f 2257 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2258
2259 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2260 if (!tid_agg_rx)
a02ae758 2261 return RX_DROP_MONITOR;
71364716 2262
8ae5977f 2263 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2264
2265 /* reset session timer */
20ad19d0
JB		 2266 if (tid_agg_rx->timeout)
2267 mod_timer(&tid_agg_rx->session_timer,
2268 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2269
dd318575 2270 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2271 /* release stored frames up to start of BAR */
d3b2fb53 2272 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2273 start_seq_num, frames);
dd318575
JB		 2274 spin_unlock(&tid_agg_rx->reorder_lock);
2275
a02ae758
JB		 2276 kfree_skb(skb);
2277 return RX_QUEUED;
71364716
RR		 2278 }
2279
08daecae
JB		 2280 /*
2281 * After this point, we only want management frames,
2282 * so we can drop all remaining control frames to
2283 * cooked monitor interfaces.
2284 */
2285 return RX_DROP_MONITOR;
71364716
RR		 2286}
2287
f4f727a6
JM		 2288static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2289 struct ieee80211_mgmt *mgmt,
2290 size_t len)
fea14732
JM		 2291{
2292 struct ieee80211_local *local = sdata->local;
2293 struct sk_buff *skb;
2294 struct ieee80211_mgmt *resp;
2295
b203ca39 2296 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2297 /* Not to own unicast address */
2298 return;
2299 }
2300
b203ca39
JP		 2301 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2302 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2303 /* Not from the current AP or not associated yet. */
fea14732
JM		 2304 return;
2305 }
2306
2307 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2308 /* Too short SA Query request frame */
2309 return;
2310 }
2311
2312 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2313 if (skb == NULL)
2314 return;
2315
2316 skb_reserve(skb, local->hw.extra_tx_headroom);
2317 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2318 memset(resp, 0, 24);
2319 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2320 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2321 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2322 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2323 IEEE80211_STYPE_ACTION);
2324 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2325 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2326 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2327 memcpy(resp->u.action.u.sa_query.trans_id,
2328 mgmt->u.action.u.sa_query.trans_id,
2329 WLAN_SA_QUERY_TR_ID_LEN);
2330
62ae67be 2331 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2332}
2333
2e161f78
JB		 2334static ieee80211_rx_result debug_noinline
2335ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2336{
2337 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2338 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2339
2340 /*
2341 * From here on, look only at management frames.
2342 * Data and control frames are already handled,
2343 * and unknown (reserved) frames are useless.
2344 */
2345 if (rx->skb->len < 24)
2346 return RX_DROP_MONITOR;
2347
2348 if (!ieee80211_is_mgmt(mgmt->frame_control))
2349 return RX_DROP_MONITOR;
2350
ee971924
JB		 2351 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2352 ieee80211_is_beacon(mgmt->frame_control) &&
2353 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2354 int sig = 0;
2355
2356 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2357 sig = status->signal;
2358
ee971924
JB		 2359 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2360 rx->skb->data, rx->skb->len,
37c73b5f 2361 status->freq, sig);
ee971924
JB		 2362 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2363 }
2364
554891e6 2365 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2366 return RX_DROP_MONITOR;
2367
2368 if (ieee80211_drop_unencrypted_mgmt(rx))
2369 return RX_DROP_UNUSABLE;
2370
2371 return RX_CONTINUE;
2372}
2373
de1ede7a
JB		 2374static ieee80211_rx_result debug_noinline
2375ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2376{
2377 struct ieee80211_local *local = rx->local;
eb9fb5b8 2378 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2379 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2380 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2381 int len = rx->skb->len;
2382
2383 if (!ieee80211_is_action(mgmt->frame_control))
2384 return RX_CONTINUE;
2385
026331c4
JM		 2386 /* drop too small frames */
2387 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2388 return RX_DROP_UNUSABLE;
de1ede7a 2389
815b8092
MP		 2390 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2391 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
84040805 2392 return RX_DROP_UNUSABLE;
de1ede7a 2393
554891e6 2394 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2395 return RX_DROP_UNUSABLE;
97ebe12a 2396
de1ede7a 2397 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2398 case WLAN_CATEGORY_HT:
2399 /* reject HT action frames from stations not supporting HT */
2400 if (!rx->sta->sta.ht_cap.ht_supported)
2401 goto invalid;
2402
2403 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2404 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2405 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2406 sdata->vif.type != NL80211_IFTYPE_AP &&
2407 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2408 break;
2409
ec61cd63 2410 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2411 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2412 goto invalid;
2413
2414 switch (mgmt->u.action.u.ht_smps.action) {
2415 case WLAN_HT_ACTION_SMPS: {
2416 struct ieee80211_supported_band *sband;
af0ed69b 2417 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2418
2419 /* convert to HT capability */
2420 switch (mgmt->u.action.u.ht_smps.smps_control) {
2421 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2422 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2423 break;
2424 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2425 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2426 break;
2427 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2428 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2429 break;
2430 default:
2431 goto invalid;
2432 }
1d8d3dec
JB		 2433
2434 /* if no change do nothing */
af0ed69b 2435 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2436 goto handled;
af0ed69b 2437 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2438
2439 sband = rx->local->hw.wiphy->bands[status->band];
2440
64f68e5d
JB		 2441 rate_control_rate_update(local, sband, rx->sta,
2442 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2443 goto handled;
2444 }
ec61cd63
JB		 2445 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2446 struct ieee80211_supported_band *sband;
2447 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2448 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2449
2450 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2451 if (!(rx->sta->sta.ht_cap.cap &
2452 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2453 goto handled;
2454
e1a0c6b3
JB		 2455 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2456 new_bw = IEEE80211_STA_RX_BW_20;
2457 else
2458 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2459
e1a0c6b3 2460 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2461 goto handled;
2462
ec61cd63
JB		 2463 sband = rx->local->hw.wiphy->bands[status->band];
2464
2465 rate_control_rate_update(local, sband, rx->sta,
2466 IEEE80211_RC_BW_CHANGED);
2467 goto handled;
2468 }
1d8d3dec
JB		 2469 default:
2470 goto invalid;
2471 }
2472
0af83d3d 2473 break;
1b3a2e49
JB		 2474 case WLAN_CATEGORY_PUBLIC:
2475 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2476 goto invalid;
2477 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2478 break;
2479 if (!rx->sta)
2480 break;
2481 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2482 break;
2483 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2484 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2485 break;
2486 if (len < offsetof(struct ieee80211_mgmt,
2487 u.action.u.ext_chan_switch.variable))
2488 goto invalid;
2489 goto queue;
0af83d3d
JB		 2490 case WLAN_CATEGORY_VHT:
2491 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2492 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2493 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2494 sdata->vif.type != NL80211_IFTYPE_AP &&
2495 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2496 break;
2497
2498 /* verify action code is present */
2499 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2500 goto invalid;
2501
2502 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2503 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2504 u8 opmode;
2505
2506 /* verify opmode is present */
2507 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2508 goto invalid;
2509
2510 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2511
2512 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2513 opmode, status->band,
2514 false);
0af83d3d
JB		 2515 goto handled;
2516 }
2517 default:
2518 break;
2519 }
1d8d3dec 2520 break;
de1ede7a 2521 case WLAN_CATEGORY_BACK:
8abd3f9b 2522 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2523 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2524 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2525 sdata->vif.type != NL80211_IFTYPE_AP &&
2526 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2527 break;
8abd3f9b 2528
026331c4
JM		 2529 /* verify action_code is present */
2530 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2531 break;
2532
de1ede7a
JB		 2533 switch (mgmt->u.action.u.addba_req.action_code) {
2534 case WLAN_ACTION_ADDBA_REQ:
2535 if (len < (IEEE80211_MIN_ACTION_SIZE +
2536 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2537 goto invalid;
2538 break;
de1ede7a
JB		 2539 case WLAN_ACTION_ADDBA_RESP:
2540 if (len < (IEEE80211_MIN_ACTION_SIZE +
2541 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2542 goto invalid;
2543 break;
de1ede7a
JB		 2544 case WLAN_ACTION_DELBA:
2545 if (len < (IEEE80211_MIN_ACTION_SIZE +
2546 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2547 goto invalid;
2548 break;
2549 default:
2550 goto invalid;
de1ede7a 2551 }
bed7ee6e 2552
8b58ff83 2553 goto queue;
39192c0b 2554 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2555 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2556 break;
46900298
JB		 2557
2558 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2559 break;
46900298 2560
026331c4
JM		 2561 /* verify action_code is present */
2562 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2563 break;
2564
39192c0b
JB		 2565 switch (mgmt->u.action.u.measurement.action_code) {
2566 case WLAN_ACTION_SPCT_MSR_REQ:
2567 if (len < (IEEE80211_MIN_ACTION_SIZE +
2568 sizeof(mgmt->u.action.u.measurement)))
84040805 2569 break;
39192c0b 2570 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2571 goto handled;
c481ec97 2572 case WLAN_ACTION_SPCT_CHL_SWITCH:
cc32abd4 2573 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2574 break;
cc32abd4 2575
b203ca39 2576 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2577 break;
c481ec97 2578
8b58ff83 2579 goto queue;
39192c0b
JB		 2580 }
2581 break;
fea14732
JM		 2582 case WLAN_CATEGORY_SA_QUERY:
2583 if (len < (IEEE80211_MIN_ACTION_SIZE +
2584 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2585 break;
2586
fea14732
JM		 2587 switch (mgmt->u.action.u.sa_query.action) {
2588 case WLAN_ACTION_SA_QUERY_REQUEST:
2589 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2590 break;
fea14732 2591 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2592 goto handled;
fea14732
JM		 2593 }
2594 break;
8db09850 2595 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2596 if (len < (IEEE80211_MIN_ACTION_SIZE +
2597 sizeof(mgmt->u.action.u.self_prot.action_code)))
2598 break;
2599
8db09850
TP		 2600 switch (mgmt->u.action.u.self_prot.action_code) {
2601 case WLAN_SP_MESH_PEERING_OPEN:
2602 case WLAN_SP_MESH_PEERING_CLOSE:
2603 case WLAN_SP_MESH_PEERING_CONFIRM:
2604 if (!ieee80211_vif_is_mesh(&sdata->vif))
2605 goto invalid;
a6dad6a2 2606 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2607 /* userspace handles this frame */
2608 break;
2609 goto queue;
2610 case WLAN_SP_MGK_INFORM:
2611 case WLAN_SP_MGK_ACK:
2612 if (!ieee80211_vif_is_mesh(&sdata->vif))
2613 goto invalid;
2614 break;
2615 }
2616 break;
d3aaec8a 2617 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2618 if (len < (IEEE80211_MIN_ACTION_SIZE +
2619 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2620 break;
2621
77a121c3
JB		 2622 if (!ieee80211_vif_is_mesh(&sdata->vif))
2623 break;
25d49e4d 2624 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2625 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2626 break;
2627 goto queue;
84040805 2628 }
026331c4 2629
2e161f78
JB		 2630 return RX_CONTINUE;
2631
bed7ee6e 2632 invalid:
554891e6 2633 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2634 /* will return in the next handlers */
2635 return RX_CONTINUE;
2636
2637 handled:
2638 if (rx->sta)
2639 rx->sta->rx_packets++;
2640 dev_kfree_skb(rx->skb);
2641 return RX_QUEUED;
2642
2643 queue:
2644 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2645 skb_queue_tail(&sdata->skb_queue, rx->skb);
2646 ieee80211_queue_work(&local->hw, &sdata->work);
2647 if (rx->sta)
2648 rx->sta->rx_packets++;
2649 return RX_QUEUED;
2650}
2651
2652static ieee80211_rx_result debug_noinline
2653ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2654{
554891e6 2655 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2656 int sig = 0;
2e161f78
JB		 2657
2658 /* skip known-bad action frames and return them in the next handler */
554891e6 2659 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2660 return RX_CONTINUE;
d7907448 2661
026331c4
JM		 2662 /*
2663 * Getting here means the kernel doesn't know how to handle
2664 * it, but maybe userspace does ... include returned frames
2665 * so userspace can register for those to know whether ones
2666 * it transmitted were processed or returned.
2667 */
026331c4 2668
804483e9
JB		 2669 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2670 sig = status->signal;
2671
71bbc994 2672 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2673 rx->skb->data, rx->skb->len,
2674 GFP_ATOMIC)) {
2675 if (rx->sta)
2676 rx->sta->rx_packets++;
2677 dev_kfree_skb(rx->skb);
2678 return RX_QUEUED;
2679 }
2680
2e161f78
JB		 2681 return RX_CONTINUE;
2682}
2683
2684static ieee80211_rx_result debug_noinline
2685ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2686{
2687 struct ieee80211_local *local = rx->local;
2688 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2689 struct sk_buff *nskb;
2690 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2691 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2692
2693 if (!ieee80211_is_action(mgmt->frame_control))
2694 return RX_CONTINUE;
2695
2696 /*
2697 * For AP mode, hostapd is responsible for handling any action
2698 * frames that we didn't handle, including returning unknown
2699 * ones. For all other modes we will return them to the sender,
2700 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2701 * 802.11-2012 9.24.4.
2e161f78
JB		 2702 * Newer versions of hostapd shall also use the management frame
2703 * registration mechanisms, but older ones still use cooked
2704 * monitor interfaces so push all frames there.
2705 */
554891e6 2706 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2707 (sdata->vif.type == NL80211_IFTYPE_AP ||
2708 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2709 return RX_DROP_MONITOR;
026331c4 2710
4b5ebccc
JB		 2711 if (is_multicast_ether_addr(mgmt->da))
2712 return RX_DROP_MONITOR;
2713
84040805
JB		 2714 /* do not return rejected action frames */
2715 if (mgmt->u.action.category & 0x80)
2716 return RX_DROP_UNUSABLE;
2717
2718 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2719 GFP_ATOMIC);
2720 if (nskb) {
292b4df6 2721 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2722
292b4df6
JL		 2723 nmgmt->u.action.category |= 0x80;
2724 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2725 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2726
2727 memset(nskb->cb, 0, sizeof(nskb->cb));
2728
07e5a5f5
JB		 2729 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2730 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2731
2732 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2733 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2734 IEEE80211_TX_CTL_NO_CCK_RATE;
2735 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2736 info->hw_queue =
2737 local->hw.offchannel_tx_hw_queue;
2738 }
2739
2740 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2741 status->band);
de1ede7a 2742 }
39192c0b
JB		 2743 dev_kfree_skb(rx->skb);
2744 return RX_QUEUED;
de1ede7a
JB		 2745}
2746
49461622 2747static ieee80211_rx_result debug_noinline
5cf121c3 2748ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2749{
eb9fb5b8 2750 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2751 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2752 __le16 stype;
571ecf67 2753
77a121c3 2754 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2755
77a121c3
JB		 2756 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2757 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2758 sdata->vif.type != NL80211_IFTYPE_STATION)
2759 return RX_DROP_MONITOR;
472dbc45 2760
77a121c3 2761 switch (stype) {
66e67e41 2762 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2763 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2764 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2765 /* process for all: mesh, mlme, ibss */
2766 break;
66e67e41
JB		 2767 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2768 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2769 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2770 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2771 if (is_multicast_ether_addr(mgmt->da) &&
2772 !is_broadcast_ether_addr(mgmt->da))
2773 return RX_DROP_MONITOR;
2774
77a121c3
JB		 2775 /* process only for station */
2776 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2777 return RX_DROP_MONITOR;
2778 break;
2779 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2780 /* process only for ibss and mesh */
2781 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2782 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2783 return RX_DROP_MONITOR;
2784 break;
2785 default:
2786 return RX_DROP_MONITOR;
2787 }
f9d540ee 2788
77a121c3 2789 /* queue up frame and kick off work to process it */
c1475ca9 2790 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2791 skb_queue_tail(&sdata->skb_queue, rx->skb);
2792 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2793 if (rx->sta)
2794 rx->sta->rx_packets++;
46900298 2795
77a121c3 2796 return RX_QUEUED;
571ecf67
JB		 2797}
2798
5cf121c3 2799/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2800static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2801 struct ieee80211_rate *rate)
3d30d949
MW		 2802{
2803 struct ieee80211_sub_if_data *sdata;
2804 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2805 struct sk_buff *skb = rx->skb, *skb2;
2806 struct net_device *prev_dev = NULL;
eb9fb5b8 2807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2808 int needed_headroom;
3d30d949 2809
554891e6
JB		 2810 /*
2811 * If cooked monitor has been processed already, then
2812 * don't do it again. If not, set the flag.
2813 */
2814 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2815 goto out_free_skb;
554891e6 2816 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2817
152c477a
JB		 2818 /* If there are no cooked monitor interfaces, just free the SKB */
2819 if (!local->cooked_mntrs)
2820 goto out_free_skb;
2821
293702a3 2822 /* room for the radiotap header based on driver features */
90b9e446 2823 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2824
293702a3
JB		 2825 if (skb_headroom(skb) < needed_headroom &&
2826 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2827 goto out_free_skb;
3d30d949 2828
293702a3 2829 /* prepend radiotap information */
973ef21a
FF		 2830 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2831 false);
3d30d949
MW		 2832
2833 skb_set_mac_header(skb, 0);
2834 skb->ip_summed = CHECKSUM_UNNECESSARY;
2835 skb->pkt_type = PACKET_OTHERHOST;
2836 skb->protocol = htons(ETH_P_802_2);
2837
2838 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2839 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2840 continue;
2841
05c914fe 2842 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2843 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2844 continue;
2845
2846 if (prev_dev) {
2847 skb2 = skb_clone(skb, GFP_ATOMIC);
2848 if (skb2) {
2849 skb2->dev = prev_dev;
5548a8a1 2850 netif_receive_skb(skb2);
3d30d949
MW		 2851 }
2852 }
2853
2854 prev_dev = sdata->dev;
2855 sdata->dev->stats.rx_packets++;
2856 sdata->dev->stats.rx_bytes += skb->len;
2857 }
2858
2859 if (prev_dev) {
2860 skb->dev = prev_dev;
5548a8a1 2861 netif_receive_skb(skb);
554891e6
JB		 2862 return;
2863 }
3d30d949
MW		 2864
2865 out_free_skb:
2866 dev_kfree_skb(skb);
2867}
2868
aa0c8636
CL		 2869static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2870 ieee80211_rx_result res)
2871{
2872 switch (res) {
2873 case RX_DROP_MONITOR:
2874 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2875 if (rx->sta)
2876 rx->sta->rx_dropped++;
2877 /* fall through */
2878 case RX_CONTINUE: {
2879 struct ieee80211_rate *rate = NULL;
2880 struct ieee80211_supported_band *sband;
2881 struct ieee80211_rx_status *status;
2882
2883 status = IEEE80211_SKB_RXCB((rx->skb));
2884
2885 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2886 if (!(status->flag & RX_FLAG_HT) &&
2887 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2888 rate = &sband->bitrates[status->rate_idx];
2889
2890 ieee80211_rx_cooked_monitor(rx, rate);
2891 break;
2892 }
2893 case RX_DROP_UNUSABLE:
2894 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2895 if (rx->sta)
2896 rx->sta->rx_dropped++;
2897 dev_kfree_skb(rx->skb);
2898 break;
2899 case RX_QUEUED:
2900 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2901 break;
2902 }
2903}
571ecf67 2904
f9e124fb
CL		 2905static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2906 struct sk_buff_head *frames)
58905290 2907{
58905290 2908 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2909 struct sk_buff *skb;
8944b79f 2910
e32f85f7
LCC		 2911#define CALL_RXH(rxh) \
2912 do { \
2913 res = rxh(rx); \
2914 if (res != RX_CONTINUE) \
2569a826 2915 goto rxh_next; \
e32f85f7 2916 } while (0);
49461622 2917
f9e124fb 2918 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2919
f9e124fb 2920 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2921 /*
2922 * all the other fields are valid across frames
2923 * that belong to an aMPDU since they are on the
2924 * same TID from the same station
2925 */
2926 rx->skb = skb;
2927
2928 CALL_RXH(ieee80211_rx_h_decrypt)
2929 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2930 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2931 CALL_RXH(ieee80211_rx_h_sta_process)
2932 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2933 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2934 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2935#ifdef CONFIG_MAC80211_MESH
aa0c8636 2936 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2937 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2938#endif
2154c81c 2939 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2940 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2941
2942 /* special treatment -- needs the queue */
2943 res = ieee80211_rx_h_ctrl(rx, frames);
2944 if (res != RX_CONTINUE)
2945 goto rxh_next;
2946
2e161f78 2947 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2948 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2949 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2950 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2951 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2952
aa0c8636
CL		 2953 rxh_next:
2954 ieee80211_rx_handlers_result(rx, res);
f9e124fb 2955
49461622 2956#undef CALL_RXH
aa0c8636 2957 }
24a8fdad 2958
f9e124fb 2959 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 2960}
2961
4406c376 2962static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2963{
f9e124fb 2964 struct sk_buff_head reorder_release;
aa0c8636
CL		 2965 ieee80211_rx_result res = RX_DROP_MONITOR;
2966
f9e124fb
CL		 2967 __skb_queue_head_init(&reorder_release);
2968
aa0c8636
CL		 2969#define CALL_RXH(rxh) \
2970 do { \
2971 res = rxh(rx); \
2972 if (res != RX_CONTINUE) \
2973 goto rxh_next; \
2974 } while (0);
2975
aa0c8636
CL		 2976 CALL_RXH(ieee80211_rx_h_check)
2977
f9e124fb 2978 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 2979
f9e124fb 2980 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 2981 return;
49461622 2982
2569a826 2983 rxh_next:
aa0c8636
CL		 2984 ieee80211_rx_handlers_result(rx, res);
2985
2986#undef CALL_RXH
58905290
JB		 2987}
2988
2bff8ebf 2989/*
dd318575
JB		 2990 * This function makes calls into the RX path, therefore
2991 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2992 */
2993void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2994{
f9e124fb 2995 struct sk_buff_head frames;
554891e6
JB		 2996 struct ieee80211_rx_data rx = {
2997 .sta = sta,
2998 .sdata = sta->sdata,
2999 .local = sta->local,
9e26297a
JB		 3000 /* This is OK -- must be QoS data frame */
3001 .security_idx = tid,
3002 .seqno_idx = tid,
fcf8bd3b 3003 .flags = 0,
554891e6 3004 };
2c15a0cf
CL		 3005 struct tid_ampdu_rx *tid_agg_rx;
3006
3007 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3008 if (!tid_agg_rx)
3009 return;
2bff8ebf 3010
f9e124fb
CL		 3011 __skb_queue_head_init(&frames);
3012
2c15a0cf 3013 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3014 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3015 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3016
f9e124fb 3017 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3018}
3019
571ecf67
JB		 3020/* main receive path */
3021
20b01f80 3022static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 3023 struct ieee80211_hdr *hdr)
3024{
20b01f80 3025 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3026 struct sk_buff *skb = rx->skb;
3027 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3028 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3029 int multicast = is_multicast_ether_addr(hdr->addr1);
3030
51fb61e7 3031 switch (sdata->vif.type) {
05c914fe 3032 case NL80211_IFTYPE_STATION:
9bc383de 3033 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 3034 return 0;
77fdaa12 3035 if (!multicast &&
b203ca39 3036 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3037 if (!(sdata->dev->flags & IFF_PROMISC) ||
3038 sdata->u.mgd.use_4addr)
23a24def 3039 return 0;
554891e6 3040 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3041 }
3042 break;
05c914fe 3043 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 3044 if (!bssid)
3045 return 0;
a7767f95 3046 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 3047 return 1;
d48b2968
JB		 3048 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3049 return 0;
23a24def 3050 } else if (!multicast &&
b203ca39 3051 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3052 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 3053 return 0;
554891e6 3054 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3055 } else if (!rx->sta) {
3056 int rate_idx;
5614618e
JB		 3057 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3058 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3059 else
eb9fb5b8 3060 rate_idx = status->rate_idx;
8bf11d8d
JB		 3061 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3062 BIT(rate_idx));
0fb8ca45 3063 }
23a24def 3064 break;
05c914fe 3065 case NL80211_IFTYPE_MESH_POINT:
6032f934 3066 if (!multicast &&
b203ca39 3067 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 3068 if (!(sdata->dev->flags & IFF_PROMISC))
3069 return 0;
3070
554891e6 3071 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3072 }
3073 break;
05c914fe
JB		 3074 case NL80211_IFTYPE_AP_VLAN:
3075 case NL80211_IFTYPE_AP:
23a24def 3076 if (!bssid) {
b203ca39 3077 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 3078 return 0;
f142c6b9 3079 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3080 /*
3081 * Accept public action frames even when the
3082 * BSSID doesn't match, this is used for P2P
3083 * and location updates. Note that mac80211
3084 * itself never looks at these frames.
3085 */
2b9ccd4e
JB		 3086 if (!multicast &&
3087 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3088 return 0;
d48b2968 3089 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 3090 return 1;
d48b2968 3091 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 3092 return 0;
554891e6 3093 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3094 }
23a24def 3095 break;
05c914fe 3096 case NL80211_IFTYPE_WDS:
a7767f95 3097 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 3098 return 0;
b203ca39 3099 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 3100 return 0;
3101 break;
f142c6b9
JB		 3102 case NL80211_IFTYPE_P2P_DEVICE:
3103 if (!ieee80211_is_public_action(hdr, skb->len) &&
3104 !ieee80211_is_probe_req(hdr->frame_control) &&
3105 !ieee80211_is_probe_resp(hdr->frame_control) &&
3106 !ieee80211_is_beacon(hdr->frame_control))
3107 return 0;
1b737f88
JB		 3108 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3109 !multicast)
f142c6b9
JB		 3110 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3111 break;
2ca27bcf 3112 default:
fb1c1cd6 3113 /* should never get here */
f142c6b9 3114 WARN_ON_ONCE(1);
fb1c1cd6 3115 break;
23a24def
JB		 3116 }
3117
3118 return 1;
3119}
3120
4406c376
JB		 3121/*
3122 * This function returns whether or not the SKB
3123 * was destined for RX processing or not, which,
3124 * if consume is true, is equivalent to whether
3125 * or not the skb was consumed.
3126 */
3127static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3128 struct sk_buff *skb, bool consume)
3129{
3130 struct ieee80211_local *local = rx->local;
3131 struct ieee80211_sub_if_data *sdata = rx->sdata;
3132 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3133 struct ieee80211_hdr *hdr = (void *)skb->data;
3134 int prepares;
3135
3136 rx->skb = skb;
554891e6 3137 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3138 prepares = prepare_for_handlers(rx, hdr);
3139
3140 if (!prepares)
3141 return false;
3142
4406c376
JB		 3143 if (!consume) {
3144 skb = skb_copy(skb, GFP_ATOMIC);
3145 if (!skb) {
3146 if (net_ratelimit())
3147 wiphy_debug(local->hw.wiphy,
b305dae4 3148 "failed to copy skb for %s\n",
4406c376
JB		 3149 sdata->name);
3150 return true;
3151 }
3152
3153 rx->skb = skb;
3154 }
3155
3156 ieee80211_invoke_rx_handlers(rx);
3157 return true;
3158}
3159
571ecf67 3160/*
6368e4b1
RR		 3161 * This is the actual Rx frames handler. as it blongs to Rx path it must
3162 * be called with rcu_read_lock protection.
571ecf67 3163 */
71ebb4aa 3164static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3165 struct sk_buff *skb)
571ecf67
JB		 3166{
3167 struct ieee80211_local *local = hw_to_local(hw);
3168 struct ieee80211_sub_if_data *sdata;
571ecf67 3169 struct ieee80211_hdr *hdr;
e3cf8b3f 3170 __le16 fc;
5cf121c3 3171 struct ieee80211_rx_data rx;
4406c376 3172 struct ieee80211_sub_if_data *prev;
56af3268 3173 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3174 int err = 0;
571ecf67 3175
e3cf8b3f 3176 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3177 memset(&rx, 0, sizeof(rx));
3178 rx.skb = skb;
3179 rx.local = local;
72abd81b 3180
e3cf8b3f 3181 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3182 local->dot11ReceivedFragmentCount++;
571ecf67 3183
4a4f1a58
JB		 3184 if (ieee80211_is_mgmt(fc)) {
3185 /* drop frame if too short for header */
3186 if (skb->len < ieee80211_hdrlen(fc))
3187 err = -ENOBUFS;
3188 else
3189 err = skb_linearize(skb);
3190 } else {
e3cf8b3f 3191 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3192 }
e3cf8b3f
ZY		 3193
3194 if (err) {
3195 dev_kfree_skb(skb);
3196 return;
3197 }
3198
3199 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3200 ieee80211_parse_qos(&rx);
d1c3a37c 3201 ieee80211_verify_alignment(&rx);
38f3714d 3202
d48b2968
JB		 3203 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3204 ieee80211_is_beacon(hdr->frame_control)))
3205 ieee80211_scan_rx(local, skb);
3206
e3cf8b3f 3207 if (ieee80211_is_data(fc)) {
56af3268 3208 prev_sta = NULL;
4406c376 3209
7852e361 3210 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3211 if (!prev_sta) {
3212 prev_sta = sta;
3213 continue;
3214 }
3215
3216 rx.sta = prev_sta;
3217 rx.sdata = prev_sta->sdata;
4406c376 3218 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3219
56af3268 3220 prev_sta = sta;
4406c376 3221 }
56af3268
BG		 3222
3223 if (prev_sta) {
3224 rx.sta = prev_sta;
3225 rx.sdata = prev_sta->sdata;
3226
4406c376 3227 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3228 return;
8e26d5ad 3229 goto out;
56af3268 3230 }
4406c376
JB		 3231 }
3232
4b0dd98e 3233 prev = NULL;
b2e7771e 3234
4b0dd98e
JB		 3235 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3236 if (!ieee80211_sdata_running(sdata))
3237 continue;
340e11f3 3238
4b0dd98e
JB		 3239 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3240 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3241 continue;
340e11f3 3242
4b0dd98e
JB		 3243 /*
3244 * frame is destined for this interface, but if it's
3245 * not also for the previous one we handle that after
3246 * the loop to avoid copying the SKB once too much
3247 */
4bb29f8c 3248
4b0dd98e 3249 if (!prev) {
abe60632 3250 prev = sdata;
4b0dd98e 3251 continue;
340e11f3 3252 }
4bb29f8c 3253
7852e361 3254 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3255 rx.sdata = prev;
3256 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3257
4b0dd98e
JB		 3258 prev = sdata;
3259 }
3260
3261 if (prev) {
7852e361 3262 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3263 rx.sdata = prev;
4406c376 3264
4b0dd98e
JB		 3265 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3266 return;
571ecf67 3267 }
4406c376 3268
8e26d5ad 3269 out:
4406c376 3270 dev_kfree_skb(skb);
571ecf67 3271}
6368e4b1
RR		 3272
3273/*
3274 * This is the receive path handler. It is called by a low level driver when an
3275 * 802.11 MPDU is received from the hardware.
3276 */
103bf9f7 3277void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3278{
3279 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3280 struct ieee80211_rate *rate = NULL;
3281 struct ieee80211_supported_band *sband;
f1d58c25 3282 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3283
d20ef63d
JB		 3284 WARN_ON_ONCE(softirq_count() == 0);
3285
444e3803 3286 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3287 goto drop;
8318d78a
JB		 3288
3289 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3290 if (WARN_ON(!sband))
3291 goto drop;
8318d78a 3292
89c3a8ac
JB		 3293 /*
3294 * If we're suspending, it is possible although not too likely
3295 * that we'd be receiving frames after having already partially
3296 * quiesced the stack. We can't process such frames then since
3297 * that might, for example, cause stations to be added or other
3298 * driver callbacks be invoked.
3299 */
77a980dc
JB		 3300 if (unlikely(local->quiescing || local->suspended))
3301 goto drop;
89c3a8ac 3302
04800ada
AN		 3303 /* We might be during a HW reconfig, prevent Rx for the same reason */
3304 if (unlikely(local->in_reconfig))
3305 goto drop;
3306
ea77f12f
JB		 3307 /*
3308 * The same happens when we're not even started,
3309 * but that's worth a warning.
3310 */
77a980dc
JB		 3311 if (WARN_ON(!local->started))
3312 goto drop;
ea77f12f 3313
fc885189 3314 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3315 /*
fc885189
JB		 3316 * Validate the rate, unless a PLCP error means that
3317 * we probably can't have a valid rate here anyway.
e5d6eb83 3318 */
fc885189
JB		 3319
3320 if (status->flag & RX_FLAG_HT) {
3321 /*
3322 * rate_idx is MCS index, which can be [0-76]
3323 * as documented on:
3324 *
3325 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3326 *
3327 * Anything else would be some sort of driver or
3328 * hardware error. The driver should catch hardware
3329 * errors.
3330 */
444e3803 3331 if (WARN(status->rate_idx > 76,
fc885189
JB		 3332 "Rate marked as an HT rate but passed "
3333 "status->rate_idx is not "
3334 "an MCS index [0-76]: %d (0x%02x)\n",
3335 status->rate_idx,
3336 status->rate_idx))
3337 goto drop;
5614618e
JB		 3338 } else if (status->flag & RX_FLAG_VHT) {
3339 if (WARN_ONCE(status->rate_idx > 9 ||
3340 !status->vht_nss ||
3341 status->vht_nss > 8,
3342 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3343 status->rate_idx, status->vht_nss))
3344 goto drop;
fc885189 3345 } else {
444e3803 3346 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3347 goto drop;
3348 rate = &sband->bitrates[status->rate_idx];
3349 }
0fb8ca45 3350 }
6368e4b1 3351
554891e6
JB		 3352 status->rx_flags = 0;
3353
6368e4b1
RR		 3354 /*
3355 * key references and virtual interfaces are protected using RCU
3356 * and this requires that we are in a read-side RCU section during
3357 * receive processing
3358 */
3359 rcu_read_lock();
3360
3361 /*
3362 * Frames with failed FCS/PLCP checksum are not returned,
3363 * all other frames are returned without radiotap header
3364 * if it was previously present.
3365 * Also, frames with less than 16 bytes are dropped.
3366 */
f1d58c25 3367 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3368 if (!skb) {
3369 rcu_read_unlock();
3370 return;
3371 }
3372
e1e54068
JB		 3373 ieee80211_tpt_led_trig_rx(local,
3374 ((struct ieee80211_hdr *)skb->data)->frame_control,
3375 skb->len);
071d9ac2 3376 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3377
3378 rcu_read_unlock();
77a980dc
JB		 3379
3380 return;
3381 drop:
3382 kfree_skb(skb);
6368e4b1 3383}
103bf9f7 3384EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3385
3386/* This is a version of the rx handler that can be called from hard irq
3387 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3388void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3389{
3390 struct ieee80211_local *local = hw_to_local(hw);
3391
3392 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3393
571ecf67
JB		 3394 skb->pkt_type = IEEE80211_RX_MSG;
3395 skb_queue_tail(&local->skb_queue, skb);
3396 tasklet_schedule(&local->tasklet);
3397}
3398EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)