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mac80211: insert stations before adding to driver
[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;
a5e70697 162 u16 channel_flags = 0;
a144f378
JB		 163 int mpdulen, chain;
164 unsigned long chains = status->chains;
f4bda337
TP		 165
166 mpdulen = skb->len;
167 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
168 mpdulen += FCS_LEN;
601ae7f2
BR		 169
170 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
171 memset(rthdr, 0, rtap_len);
a144f378 172 it_present = &rthdr->it_present;
601ae7f2
BR		 173
174 /* radiotap header, set always present flags */
90b9e446 175 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
a144f378
JB		 176 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
177 BIT(IEEE80211_RADIOTAP_CHANNEL) |
178 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
179
180 if (!status->chains)
181 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
182
183 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
184 it_present_val |=
185 BIT(IEEE80211_RADIOTAP_EXT) |
186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
187 put_unaligned_le32(it_present_val, it_present);
188 it_present++;
189 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
191 }
601ae7f2 192
90b9e446 193 if (status->vendor_radiotap_len) {
a144f378
JB		 194 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
195 BIT(IEEE80211_RADIOTAP_EXT);
196 put_unaligned_le32(it_present_val, it_present);
197 it_present++;
198 it_present_val = status->vendor_radiotap_bitmap;
90b9e446
JB		 199 }
200
a144f378
JB		 201 put_unaligned_le32(it_present_val, it_present);
202
203 pos = (void *)(it_present + 1);
204
601ae7f2
BR		 205 /* the order of the following fields is important */
206
207 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 208 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 209 /* padding */
210 while ((pos - (u8 *)rthdr) & 7)
211 *pos++ = 0;
f4bda337
TP		 212 put_unaligned_le64(
213 ieee80211_calculate_rx_timestamp(local, status,
214 mpdulen, 0),
215 pos);
1df332e8 216 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 217 pos += 8;
218 }
219
220 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 221 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 222 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 223 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
224 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 225 if (status->flag & RX_FLAG_SHORTPRE)
226 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 227 pos++;
228
229 /* IEEE80211_RADIOTAP_RATE */
5614618e 230 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 231 /*
f8d1ccf1 232 * Without rate information don't add it. If we have,
38f37be2 233 * MCS information is a separate field in radiotap,
73b48099
JB		 234 * added below. The byte here is needed as padding
235 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 236 */
237 *pos = 0;
8d6f658e 238 } else {
2103dec1 239 int shift = 0;
ebe6c7ba 240 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 241 if (status->flag & RX_FLAG_10MHZ)
242 shift = 1;
243 else if (status->flag & RX_FLAG_5MHZ)
244 shift = 2;
245 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 246 }
601ae7f2
BR		 247 pos++;
248
249 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 250 put_unaligned_le16(status->freq, pos);
601ae7f2 251 pos += 2;
a5e70697
SW		 252 if (status->flag & RX_FLAG_10MHZ)
253 channel_flags |= IEEE80211_CHAN_HALF;
254 else if (status->flag & RX_FLAG_5MHZ)
255 channel_flags |= IEEE80211_CHAN_QUARTER;
256
601ae7f2 257 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 258 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 259 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 260 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 261 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 262 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 263 else if (rate)
a5e70697 264 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 265 else
a5e70697
SW		 266 channel_flags |= IEEE80211_CHAN_2GHZ;
267 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 268 pos += 2;
269
270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 271 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
272 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 273 *pos = status->signal;
274 rthdr->it_present |=
275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
276 pos++;
277 }
278
601ae7f2
BR		 279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
280
a144f378
JB		 281 if (!status->chains) {
282 /* IEEE80211_RADIOTAP_ANTENNA */
283 *pos = status->antenna;
284 pos++;
285 }
601ae7f2 286
601ae7f2
BR		 287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
288
289 /* IEEE80211_RADIOTAP_RX_FLAGS */
290 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 291 if ((pos - (u8 *)rthdr) & 1)
90b9e446 292 *pos++ = 0;
aae89831 293 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 294 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
295 put_unaligned_le16(rx_flags, pos);
601ae7f2 296 pos += 2;
6d744bac
JB		 297
298 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 299 unsigned int stbc;
300
6d744bac 301 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 302 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 303 *pos = 0;
304 if (status->flag & RX_FLAG_SHORT_GI)
305 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
306 if (status->flag & RX_FLAG_40MHZ)
307 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 308 if (status->flag & RX_FLAG_HT_GF)
309 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
786677d1
OR		 310 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
311 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 312 pos++;
313 *pos++ = status->rate_idx;
314 }
4c298677
JB		 315
316 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
317 u16 flags = 0;
318
319 /* ensure 4 byte alignment */
320 while ((pos - (u8 *)rthdr) & 3)
321 pos++;
322 rthdr->it_present |=
323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
324 put_unaligned_le32(status->ampdu_reference, pos);
325 pos += 4;
326 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
327 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
328 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
329 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
330 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
331 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
332 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
333 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
334 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
335 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
336 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
337 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
338 put_unaligned_le16(flags, pos);
339 pos += 2;
340 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
341 *pos++ = status->ampdu_delimiter_crc;
342 else
343 *pos++ = 0;
344 *pos++ = 0;
345 }
90b9e446 346
51648921
JB		 347 if (status->flag & RX_FLAG_VHT) {
348 u16 known = local->hw.radiotap_vht_details;
349
350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
351 /* known field - how to handle 80+80? */
352 if (status->flag & RX_FLAG_80P80MHZ)
353 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
354 put_unaligned_le16(known, pos);
355 pos += 2;
356 /* flags */
357 if (status->flag & RX_FLAG_SHORT_GI)
358 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
359 pos++;
360 /* bandwidth */
361 if (status->flag & RX_FLAG_80MHZ)
362 *pos++ = 4;
363 else if (status->flag & RX_FLAG_80P80MHZ)
364 *pos++ = 0; /* marked not known above */
365 else if (status->flag & RX_FLAG_160MHZ)
366 *pos++ = 11;
367 else if (status->flag & RX_FLAG_40MHZ)
368 *pos++ = 1;
369 else /* 20 MHz */
370 *pos++ = 0;
371 /* MCS/NSS */
372 *pos = (status->rate_idx << 4) | status->vht_nss;
373 pos += 4;
374 /* coding field */
375 pos++;
376 /* group ID */
377 pos++;
378 /* partial_aid */
379 pos += 2;
380 }
381
a144f378
JB		 382 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
383 *pos++ = status->chain_signal[chain];
384 *pos++ = chain;
385 }
386
90b9e446
JB		 387 if (status->vendor_radiotap_len) {
388 /* ensure 2 byte alignment for the vendor field as required */
389 if ((pos - (u8 *)rthdr) & 1)
390 *pos++ = 0;
391 *pos++ = status->vendor_radiotap_oui[0];
392 *pos++ = status->vendor_radiotap_oui[1];
393 *pos++ = status->vendor_radiotap_oui[2];
394 *pos++ = status->vendor_radiotap_subns;
395 put_unaligned_le16(status->vendor_radiotap_len, pos);
396 pos += 2;
397 /* align the actual payload as requested */
398 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
399 *pos++ = 0;
400 }
601ae7f2
BR		 401}
402
b2e7771e
JB		 403/*
404 * This function copies a received frame to all monitor interfaces and
405 * returns a cleaned-up SKB that no longer includes the FCS nor the
406 * radiotap header the driver might have added.
407 */
408static struct sk_buff *
409ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 410 struct ieee80211_rate *rate)
b2e7771e 411{
f1d58c25 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 413 struct ieee80211_sub_if_data *sdata;
293702a3 414 int needed_headroom;
b2e7771e
JB		 415 struct sk_buff *skb, *skb2;
416 struct net_device *prev_dev = NULL;
417 int present_fcs_len = 0;
b2e7771e
JB		 418
419 /*
420 * First, we may need to make a copy of the skb because
421 * (1) we need to modify it for radiotap (if not present), and
422 * (2) the other RX handlers will modify the skb we got.
423 *
424 * We don't need to, of course, if we aren't going to return
425 * the SKB because it has a bad FCS/PLCP checksum.
426 */
0869aea0 427
b2e7771e
JB		 428 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
429 present_fcs_len = FCS_LEN;
430
605f1a5b
JB		 431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 433 dev_kfree_skb(origskb);
434 return NULL;
435 }
436
b2e7771e 437 if (!local->monitors) {
0869aea0 438 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 439 dev_kfree_skb(origskb);
440 return NULL;
441 }
442
0869aea0 443 return remove_monitor_info(local, origskb);
b2e7771e
JB		 444 }
445
751413ea
HS		 446 /* room for the radiotap header based on driver features */
447 needed_headroom = ieee80211_rx_radiotap_space(local, status);
448
0869aea0 449 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 450 /* only need to expand headroom if necessary */
451 skb = origskb;
452 origskb = NULL;
453
454 /*
455 * This shouldn't trigger often because most devices have an
456 * RX header they pull before we get here, and that should
457 * be big enough for our radiotap information. We should
458 * probably export the length to drivers so that we can have
459 * them allocate enough headroom to start with.
460 */
461 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 462 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 463 dev_kfree_skb(skb);
464 return NULL;
465 }
466 } else {
467 /*
468 * Need to make a copy and possibly remove radiotap header
469 * and FCS from the original.
470 */
471 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
472
0869aea0 473 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 474
475 if (!skb)
476 return origskb;
477 }
478
0869aea0 479 /* prepend radiotap information */
973ef21a
FF		 480 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
481 true);
b2e7771e 482
ce3edf6d 483 skb_reset_mac_header(skb);
b2e7771e
JB		 484 skb->ip_summed = CHECKSUM_UNNECESSARY;
485 skb->pkt_type = PACKET_OTHERHOST;
486 skb->protocol = htons(ETH_P_802_2);
487
488 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 489 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 490 continue;
491
3d30d949
MW		 492 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
493 continue;
494
9607e6b6 495 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 496 continue;
497
b2e7771e
JB		 498 if (prev_dev) {
499 skb2 = skb_clone(skb, GFP_ATOMIC);
500 if (skb2) {
501 skb2->dev = prev_dev;
5548a8a1 502 netif_receive_skb(skb2);
b2e7771e
JB		 503 }
504 }
505
506 prev_dev = sdata->dev;
507 sdata->dev->stats.rx_packets++;
508 sdata->dev->stats.rx_bytes += skb->len;
509 }
510
511 if (prev_dev) {
512 skb->dev = prev_dev;
5548a8a1 513 netif_receive_skb(skb);
b2e7771e
JB		 514 } else
515 dev_kfree_skb(skb);
516
517 return origskb;
518}
519
5cf121c3 520static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 521{
238f74a2 522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 524 int tid, seqno_idx, security_idx;
6e0d114d
JB		 525
526 /* does the frame have a qos control field? */
238f74a2
HH		 527 if (ieee80211_is_data_qos(hdr->frame_control)) {
528 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 529 /* frame has qos control */
238f74a2 530 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 531 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 532 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 533
534 seqno_idx = tid;
535 security_idx = tid;
6e0d114d 536 } else {
1411f9b5
JB		 537 /*
538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
539 *
540 * Sequence numbers for management frames, QoS data
541 * frames with a broadcast/multicast address in the
542 * Address 1 field, and all non-QoS data frames sent
543 * by QoS STAs are assigned using an additional single
544 * modulo-4096 counter, [...]
545 *
546 * We also use that counter for non-QoS STAs.
547 */
5a306f58 548 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 549 security_idx = 0;
550 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 551 security_idx = IEEE80211_NUM_TIDS;
9e26297a 552 tid = 0;
6e0d114d 553 }
52865dfd 554
9e26297a
JB		 555 rx->seqno_idx = seqno_idx;
556 rx->security_idx = security_idx;
6e0d114d
JB		 557 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558 * For now, set skb->priority to 0 for other cases. */
559 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 560}
6e0d114d 561
d1c3a37c
JB		 562/**
563 * DOC: Packet alignment
564 *
565 * Drivers always need to pass packets that are aligned to two-byte boundaries
566 * to the stack.
567 *
568 * Additionally, should, if possible, align the payload data in a way that
569 * guarantees that the contained IP header is aligned to a four-byte
570 * boundary. In the case of regular frames, this simply means aligning the
571 * payload to a four-byte boundary (because either the IP header is directly
572 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 573 * in front of it). If the payload data is not properly aligned and the
574 * architecture doesn't support efficient unaligned operations, mac80211
575 * will align the data.
d1c3a37c
JB		 576 *
577 * With A-MSDU frames, however, the payload data address must yield two modulo
578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579 * push the IP header further back to a multiple of four again. Thankfully, the
580 * specs were sane enough this time around to require padding each A-MSDU
581 * subframe to a length that is a multiple of four.
582 *
25985edc 583 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 584 * the payload is not supported, the driver is required to move the 802.11
585 * header to be directly in front of the payload in that case.
586 */
587static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 588{
59d9cb07
KV		 589#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590 WARN_ONCE((unsigned long)rx->skb->data & 1,
591 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 592#endif
6e0d114d
JB		 593}
594
6368e4b1 595
571ecf67
JB		 596/* rx handlers */
597
3cfcf6ac
JM		 598static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
599{
600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
601
602 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
603 return 0;
604
605 return ieee80211_is_robust_mgmt_frame(hdr);
606}
607
608
609static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
610{
611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
612
613 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
614 return 0;
615
616 return ieee80211_is_robust_mgmt_frame(hdr);
617}
618
619
620/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
622{
623 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
624 struct ieee80211_mmie *mmie;
625
1df332e8 626 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 627 return -1;
628
629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
630 return -1; /* not a robust management frame */
631
632 mmie = (struct ieee80211_mmie *)
633 (skb->data + skb->len - sizeof(*mmie));
634 if (mmie->element_id != WLAN_EID_MMIE ||
635 mmie->length != sizeof(*mmie) - 2)
636 return -1;
637
638 return le16_to_cpu(mmie->key_id);
639}
640
2475b1cc
MS		 641static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
642 struct sk_buff *skb)
643{
644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
645 __le16 fc;
646 int hdrlen;
647 u8 keyid;
648
649 fc = hdr->frame_control;
650 hdrlen = ieee80211_hdrlen(fc);
651
652 if (skb->len < hdrlen + cs->hdr_len)
653 return -EINVAL;
654
655 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
656 keyid &= cs->key_idx_mask;
657 keyid >>= cs->key_idx_shift;
658
659 return keyid;
660}
661
1df332e8 662static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 663{
a7767f95 664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 665 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 666
a7767f95 667 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 668 if (is_multicast_ether_addr(hdr->addr1)) {
669 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 670 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 671 return RX_DROP_MONITOR;
b203ca39 672 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 673 return RX_DROP_MONITOR;
674 } else {
675 if (!ieee80211_has_a4(hdr->frame_control))
676 return RX_DROP_MONITOR;
b203ca39 677 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 678 return RX_DROP_MONITOR;
679 }
33b64eb2
LCC		 680 }
681
682 /* If there is not an established peer link and this is not a peer link
683 * establisment frame, beacon or probe, drop the frame.
684 */
685
57cf8043 686 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 687 struct ieee80211_mgmt *mgmt;
d6d1a5a7 688
a7767f95 689 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 690 return RX_DROP_MONITOR;
691
a7767f95 692 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 693 u8 category;
9b395bc3
JB		 694
695 /* make sure category field is present */
696 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
697 return RX_DROP_MONITOR;
698
33b64eb2 699 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 700 category = mgmt->u.action.category;
701 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 702 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 703 return RX_DROP_MONITOR;
33b64eb2 704 return RX_CONTINUE;
33b64eb2
LCC		 705 }
706
a7767f95
HH		 707 if (ieee80211_is_probe_req(hdr->frame_control) ||
708 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 709 ieee80211_is_beacon(hdr->frame_control) ||
710 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 711 return RX_CONTINUE;
712
713 return RX_DROP_MONITOR;
a7767f95
HH		 714 }
715
902acc78
JB		 716 return RX_CONTINUE;
717}
33b64eb2 718
d3b2fb53 719static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 720 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 721 int index,
722 struct sk_buff_head *frames)
1edfb1af 723{
1edfb1af 724 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 725 struct ieee80211_rx_status *status;
1edfb1af 726
dd318575
JB		 727 lockdep_assert_held(&tid_agg_rx->reorder_lock);
728
1edfb1af
JB		 729 if (!skb)
730 goto no_frame;
731
071d9ac2 732 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 733 tid_agg_rx->stored_mpdu_num--;
734 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 735 status = IEEE80211_SKB_RXCB(skb);
736 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
f9e124fb 737 __skb_queue_tail(frames, skb);
1edfb1af
JB		 738
739no_frame:
9a886586 740 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 741}
742
d3b2fb53 743static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 744 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 745 u16 head_seq_num,
746 struct sk_buff_head *frames)
1edfb1af
JB		 747{
748 int index;
749
dd318575
JB		 750 lockdep_assert_held(&tid_agg_rx->reorder_lock);
751
9a886586 752 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 753 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 754 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
755 frames);
1edfb1af
JB		 756 }
757}
758
759/*
760 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
761 * the skb was added to the buffer longer than this time ago, the earlier
762 * frames that have not yet been received are assumed to be lost and the skb
763 * can be released for processing. This may also release other skb's from the
764 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 765 *
766 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 767 */
768#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
769
d3b2fb53 770static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 771 struct tid_ampdu_rx *tid_agg_rx,
772 struct sk_buff_head *frames)
aa0c8636 773{
2bff8ebf 774 int index, j;
aa0c8636 775
dd318575
JB		 776 lockdep_assert_held(&tid_agg_rx->reorder_lock);
777
aa0c8636 778 /* release the buffer until next missing frame */
2e3049b7 779 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 780 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 781 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 782 /*
783 * No buffers ready to be released, but check whether any
784 * frames in the reorder buffer have timed out.
785 */
aa0c8636
CL		 786 int skipped = 1;
787 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
788 j = (j + 1) % tid_agg_rx->buf_size) {
789 if (!tid_agg_rx->reorder_buf[j]) {
790 skipped++;
791 continue;
792 }
499fe9a4
DH		 793 if (skipped &&
794 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 795 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 796 goto set_release_timer;
aa0c8636 797
bdcbd8e0
JB		 798 ht_dbg_ratelimited(sdata,
799 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 800 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
801 frames);
aa0c8636
CL		 802
803 /*
804 * Increment the head seq# also for the skipped slots.
805 */
806 tid_agg_rx->head_seq_num =
9a886586
JB		 807 (tid_agg_rx->head_seq_num +
808 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 809 skipped = 0;
810 }
811 } else while (tid_agg_rx->reorder_buf[index]) {
f9e124fb
CL		 812 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
813 frames);
2e3049b7 814 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 815 }
2bff8ebf
CL		 816
817 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 818 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 819
820 for (; j != (index - 1) % tid_agg_rx->buf_size;
821 j = (j + 1) % tid_agg_rx->buf_size) {
822 if (tid_agg_rx->reorder_buf[j])
823 break;
824 }
825
826 set_release_timer:
827
828 mod_timer(&tid_agg_rx->reorder_timer,
334df731 829 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 830 HT_RX_REORDER_BUF_TIMEOUT);
831 } else {
832 del_timer(&tid_agg_rx->reorder_timer);
833 }
aa0c8636
CL		 834}
835
1edfb1af
JB		 836/*
837 * As this function belongs to the RX path it must be under
838 * rcu_read_lock protection. It returns false if the frame
839 * can be processed immediately, true if it was consumed.
840 */
d3b2fb53 841static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 842 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 843 struct sk_buff *skb,
844 struct sk_buff_head *frames)
1edfb1af
JB		 845{
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
847 u16 sc = le16_to_cpu(hdr->seq_ctrl);
848 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
849 u16 head_seq_num, buf_size;
850 int index;
2bff8ebf 851 bool ret = true;
1edfb1af 852
dd318575
JB		 853 spin_lock(&tid_agg_rx->reorder_lock);
854
1edfb1af
JB		 855 buf_size = tid_agg_rx->buf_size;
856 head_seq_num = tid_agg_rx->head_seq_num;
857
858 /* frame with out of date sequence number */
9a886586 859 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 860 dev_kfree_skb(skb);
2bff8ebf 861 goto out;
1edfb1af
JB		 862 }
863
864 /*
865 * If frame the sequence number exceeds our buffering window
866 * size release some previous frames to make room for this one.
867 */
9a886586
JB		 868 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
869 head_seq_num = ieee80211_sn_inc(
870 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 871 /* release stored frames up to new head to stack */
d3b2fb53 872 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 873 head_seq_num, frames);
1edfb1af
JB		 874 }
875
876 /* Now the new frame is always in the range of the reordering buffer */
877
2e3049b7 878 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 879
880 /* check if we already stored this frame */
881 if (tid_agg_rx->reorder_buf[index]) {
882 dev_kfree_skb(skb);
2bff8ebf 883 goto out;
1edfb1af
JB		 884 }
885
886 /*
887 * If the current MPDU is in the right order and nothing else
888 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 889 * If it is first but there's something stored, we may be able
890 * to release frames after this one.
1edfb1af
JB		 891 */
892 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
893 tid_agg_rx->stored_mpdu_num == 0) {
9a886586
JB		 894 tid_agg_rx->head_seq_num =
895 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 896 ret = false;
897 goto out;
1edfb1af
JB		 898 }
899
900 /* put the frame in the reordering buffer */
901 tid_agg_rx->reorder_buf[index] = skb;
902 tid_agg_rx->reorder_time[index] = jiffies;
903 tid_agg_rx->stored_mpdu_num++;
f9e124fb 904 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1edfb1af 905
2bff8ebf
CL		 906 out:
907 spin_unlock(&tid_agg_rx->reorder_lock);
908 return ret;
1edfb1af
JB		 909}
910
911/*
912 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
913 * true if the MPDU was buffered, false if it should be processed.
914 */
f9e124fb
CL		 915static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
916 struct sk_buff_head *frames)
1edfb1af 917{
2569a826
JB		 918 struct sk_buff *skb = rx->skb;
919 struct ieee80211_local *local = rx->local;
1edfb1af 920 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 922 struct sta_info *sta = rx->sta;
1edfb1af
JB		 923 struct tid_ampdu_rx *tid_agg_rx;
924 u16 sc;
6cc00d54 925 u8 tid, ack_policy;
1edfb1af 926
051a41fa
JB		 927 if (!ieee80211_is_data_qos(hdr->frame_control) ||
928 is_multicast_ether_addr(hdr->addr1))
2569a826 929 goto dont_reorder;
1edfb1af
JB		 930
931 /*
932 * filter the QoS data rx stream according to
933 * STA/TID and check if this STA/TID is on aggregation
934 */
935
1edfb1af 936 if (!sta)
2569a826 937 goto dont_reorder;
1edfb1af 938
6cc00d54
TP		 939 ack_policy = *ieee80211_get_qos_ctl(hdr) &
940 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 941 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
942
a87f736d
JB		 943 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
944 if (!tid_agg_rx)
945 goto dont_reorder;
1edfb1af
JB		 946
947 /* qos null data frames are excluded */
948 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 949 goto dont_reorder;
1edfb1af 950
6cc00d54
TP		 951 /* not part of a BA session */
952 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
953 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
954 goto dont_reorder;
955
660c6a44
TP		 956 /* not actually part of this BA session */
957 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
958 goto dont_reorder;
959
1edfb1af
JB		 960 /* new, potentially un-ordered, ampdu frame - process it */
961
962 /* reset session timer */
963 if (tid_agg_rx->timeout)
12d3952f 964 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 965
966 /* if this mpdu is fragmented - terminate rx aggregation session */
967 sc = le16_to_cpu(hdr->seq_ctrl);
968 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 969 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 970 skb_queue_tail(&rx->sdata->skb_queue, skb);
971 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 972 return;
1edfb1af
JB		 973 }
974
a87f736d
JB		 975 /*
976 * No locking needed -- we will only ever process one
977 * RX packet at a time, and thus own tid_agg_rx. All
978 * other code manipulating it needs to (and does) make
979 * sure that we cannot get to it any more before doing
980 * anything with it.
981 */
f9e124fb
CL		 982 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
983 frames))
2569a826
JB		 984 return;
985
986 dont_reorder:
f9e124fb 987 __skb_queue_tail(frames, skb);
1edfb1af 988}
33b64eb2 989
49461622 990static ieee80211_rx_result debug_noinline
5cf121c3 991ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 992{
a7767f95 993 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 994 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 995
6b0f3274
JB		 996 /*
997 * Drop duplicate 802.11 retransmissions
998 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
999 */
1000 if (rx->skb->len >= 24 && rx->sta &&
1001 !ieee80211_is_ctl(hdr->frame_control) &&
1002 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1003 !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 1004 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 1005 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 1006 hdr->seq_ctrl)) {
554891e6 1007 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 1008 rx->local->dot11FrameDuplicateCount++;
1009 rx->sta->num_duplicates++;
1010 }
b1f93314 1011 return RX_DROP_UNUSABLE;
0cfcefef 1012 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
9e26297a 1013 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
0cfcefef 1014 }
571ecf67
JB		 1015 }
1016
571ecf67
JB		 1017 if (unlikely(rx->skb->len < 16)) {
1018 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 1019 return RX_DROP_MONITOR;
571ecf67
JB		 1020 }
1021
571ecf67
JB		 1022 /* Drop disallowed frame classes based on STA auth/assoc state;
1023 * IEEE 802.11, Chap 5.5.
1024 *
ccd7b362
JB		 1025 * mac80211 filters only based on association state, i.e. it drops
1026 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1027 * deauth/disassoc frames when needed. In addition, hostapd is
1028 * responsible for filtering on both auth and assoc states.
1029 */
33b64eb2 1030
902acc78 1031 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1032 return ieee80211_rx_mesh_check(rx);
33b64eb2 1033
a7767f95
HH		 1034 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1035 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1036 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1037 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 1038 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1039 /*
1040 * accept port control frames from the AP even when it's not
1041 * yet marked ASSOC to prevent a race where we don't set the
1042 * assoc bit quickly enough before it sends the first frame
1043 */
1044 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1045 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1046 unsigned int hdrlen;
1047 __be16 ethertype;
1048
1049 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1050
1051 if (rx->skb->len < hdrlen + 8)
1052 return RX_DROP_MONITOR;
1053
1054 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1055 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1056 return RX_CONTINUE;
1057 }
21fc7560
JB		 1058
1059 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1060 cfg80211_rx_spurious_frame(rx->sdata->dev,
1061 hdr->addr2,
1062 GFP_ATOMIC))
1063 return RX_DROP_UNUSABLE;
1064
e4c26add 1065 return RX_DROP_MONITOR;
2a33bee2 1066 }
571ecf67 1067
9ae54c84 1068 return RX_CONTINUE;
570bd537
JB		 1069}
1070
1071
572e0012
KV		 1072static ieee80211_rx_result debug_noinline
1073ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1074{
1075 struct ieee80211_local *local;
1076 struct ieee80211_hdr *hdr;
1077 struct sk_buff *skb;
1078
1079 local = rx->local;
1080 skb = rx->skb;
1081 hdr = (struct ieee80211_hdr *) skb->data;
1082
1083 if (!local->pspolling)
1084 return RX_CONTINUE;
1085
1086 if (!ieee80211_has_fromds(hdr->frame_control))
1087 /* this is not from AP */
1088 return RX_CONTINUE;
1089
1090 if (!ieee80211_is_data(hdr->frame_control))
1091 return RX_CONTINUE;
1092
1093 if (!ieee80211_has_moredata(hdr->frame_control)) {
1094 /* AP has no more frames buffered for us */
1095 local->pspolling = false;
1096 return RX_CONTINUE;
1097 }
1098
1099 /* more data bit is set, let's request a new frame from the AP */
1100 ieee80211_send_pspoll(local, rx->sdata);
1101
1102 return RX_CONTINUE;
1103}
1104
d012a605 1105static void sta_ps_start(struct sta_info *sta)
571ecf67 1106{
133b8226 1107 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1108 struct ieee80211_local *local = sdata->local;
d012a605 1109 struct ps_data *ps;
0795af57 1110
d012a605
MP		 1111 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1112 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1113 ps = &sdata->bss->ps;
1114 else
1115 return;
1116
1117 atomic_inc(&ps->num_sta_ps);
c2c98fde 1118 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1119 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1120 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1121 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1122 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1123}
1124
d012a605 1125static void sta_ps_end(struct sta_info *sta)
571ecf67 1126{
bdcbd8e0
JB		 1127 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1128 sta->sta.addr, sta->sta.aid);
004c872e 1129
c2c98fde 1130 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1131 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1132 sta->sta.addr, sta->sta.aid);
af818581
JB		 1133 return;
1134 }
1135
1136 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1137}
1138
d057e5a3
AN		 1139int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1140{
1141 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1142 bool in_ps;
1143
1144 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1145
1146 /* Don't let the same PS state be set twice */
c2c98fde 1147 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1148 if ((start && in_ps) || (!start && !in_ps))
1149 return -EINVAL;
1150
1151 if (start)
d012a605 1152 sta_ps_start(sta_inf);
d057e5a3 1153 else
d012a605 1154 sta_ps_end(sta_inf);
d057e5a3
AN		 1155
1156 return 0;
1157}
1158EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1159
47086fc5
JB		 1160static ieee80211_rx_result debug_noinline
1161ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1162{
1163 struct ieee80211_sub_if_data *sdata = rx->sdata;
1164 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1165 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1166 int tid, ac;
1167
1168 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1169 return RX_CONTINUE;
1170
1171 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1172 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1173 return RX_CONTINUE;
1174
1175 /*
1176 * The device handles station powersave, so don't do anything about
1177 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1178 * it to mac80211 since they're handled.)
1179 */
1180 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1181 return RX_CONTINUE;
1182
1183 /*
1184 * Don't do anything if the station isn't already asleep. In
1185 * the uAPSD case, the station will probably be marked asleep,
1186 * in the PS-Poll case the station must be confused ...
1187 */
c2c98fde 1188 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1189 return RX_CONTINUE;
1190
1191 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1192 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1193 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1194 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1195 else
c2c98fde 1196 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1197 }
47086fc5
JB		 1198
1199 /* Free PS Poll skb here instead of returning RX_DROP that would
1200 * count as an dropped frame. */
1201 dev_kfree_skb(rx->skb);
1202
1203 return RX_QUEUED;
1204 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1205 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1206 ieee80211_has_pm(hdr->frame_control) &&
1207 (ieee80211_is_data_qos(hdr->frame_control) ||
1208 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1209 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1210 ac = ieee802_1d_to_ac[tid & 7];
1211
1212 /*
1213 * If this AC is not trigger-enabled do nothing.
1214 *
1215 * NB: This could/should check a separate bitmap of trigger-
1216 * enabled queues, but for now we only implement uAPSD w/o
1217 * TSPEC changes to the ACs, so they're always the same.
1218 */
1219 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1220 return RX_CONTINUE;
1221
1222 /* if we are in a service period, do nothing */
c2c98fde 1223 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1224 return RX_CONTINUE;
1225
c2c98fde 1226 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1227 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1228 else
c2c98fde 1229 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1230 }
1231
1232 return RX_CONTINUE;
1233}
1234
49461622 1235static ieee80211_rx_result debug_noinline
5cf121c3 1236ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1237{
1238 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1239 struct sk_buff *skb = rx->skb;
1240 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1242 int i;
571ecf67
JB		 1243
1244 if (!sta)
9ae54c84 1245 return RX_CONTINUE;
571ecf67 1246
b291ba11
JB		 1247 /*
1248 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1249 * BSSID and for station already AUTHORIZED to avoid keeping the
1250 * current IBSS network alive in cases where other STAs start
1251 * using different BSSID. This will also give the station another
1252 * chance to restart the authentication/authorization in case
1253 * something went wrong the first time.
b291ba11 1254 */
05c914fe 1255 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1256 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1257 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1258 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1259 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1260 sta->last_rx = jiffies;
3af6334c
FF		 1261 if (ieee80211_is_data(hdr->frame_control)) {
1262 sta->last_rx_rate_idx = status->rate_idx;
1263 sta->last_rx_rate_flag = status->flag;
5614618e 1264 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1265 }
1266 }
b291ba11
JB		 1267 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1268 /*
33b64eb2
LCC		 1269 * Mesh beacons will update last_rx when if they are found to
1270 * match the current local configuration when processed.
571ecf67 1271 */
b291ba11 1272 sta->last_rx = jiffies;
3af6334c
FF		 1273 if (ieee80211_is_data(hdr->frame_control)) {
1274 sta->last_rx_rate_idx = status->rate_idx;
1275 sta->last_rx_rate_flag = status->flag;
5614618e 1276 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1277 }
571ecf67
JB		 1278 }
1279
554891e6 1280 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1281 return RX_CONTINUE;
571ecf67 1282
3cf335d5
KV		 1283 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1284 ieee80211_sta_rx_notify(rx->sdata, hdr);
1285
571ecf67
JB		 1286 sta->rx_fragments++;
1287 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1288 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1289 sta->last_signal = status->signal;
1290 ewma_add(&sta->avg_signal, -status->signal);
1291 }
571ecf67 1292
ef0621e8
FF		 1293 if (status->chains) {
1294 sta->chains = status->chains;
1295 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1296 int signal = status->chain_signal[i];
1297
1298 if (!(status->chains & BIT(i)))
1299 continue;
1300
1301 sta->chain_signal_last[i] = signal;
1302 ewma_add(&sta->chain_signal_avg[i], -signal);
1303 }
1304 }
1305
72eaa43a
JB		 1306 /*
1307 * Change STA power saving mode only at the end of a frame
1308 * exchange sequence.
1309 */
d057e5a3
AN		 1310 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1311 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1312 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1313 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1314 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1315 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1316 /*
1317 * Ignore doze->wake transitions that are
1318 * indicated by non-data frames, the standard
1319 * is unclear here, but for example going to
1320 * PS mode and then scanning would cause a
1321 * doze->wake transition for the probe request,
1322 * and that is clearly undesirable.
1323 */
1324 if (ieee80211_is_data(hdr->frame_control) &&
1325 !ieee80211_has_pm(hdr->frame_control))
d012a605 1326 sta_ps_end(sta);
72eaa43a
JB		 1327 } else {
1328 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1329 sta_ps_start(sta);
72eaa43a 1330 }
571ecf67
JB		 1331 }
1332
3f52b7e3
MP		 1333 /* mesh power save support */
1334 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1335 ieee80211_mps_rx_h_sta_process(sta, hdr);
1336
22403def
JB		 1337 /*
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1340 */
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1344
1345 /*
1346 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
d524215f
FF		 1350 */
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1358 GFP_ATOMIC);
d524215f 1359 return RX_DROP_MONITOR;
e7f4a940 1360 }
22403def
JB		 1361 /*
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1364 */
571ecf67
JB		 1365 sta->rx_packets++;
1366 dev_kfree_skb(rx->skb);
9ae54c84 1367 return RX_QUEUED;
571ecf67
JB		 1368 }
1369
9ae54c84 1370 return RX_CONTINUE;
571ecf67
JB		 1371} /* ieee80211_rx_h_sta_process */
1372
86c228a7
JA		 1373static ieee80211_rx_result debug_noinline
1374ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1375{
1376 struct sk_buff *skb = rx->skb;
1377 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1378 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1379 int keyidx;
1380 int hdrlen;
1381 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1382 struct ieee80211_key *sta_ptk = NULL;
1383 int mmie_keyidx = -1;
1384 __le16 fc;
2475b1cc 1385 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1386
1387 /*
1388 * Key selection 101
1389 *
1390 * There are four types of keys:
1391 * - GTK (group keys)
1392 * - IGTK (group keys for management frames)
1393 * - PTK (pairwise keys)
1394 * - STK (station-to-station pairwise keys)
1395 *
1396 * When selecting a key, we have to distinguish between multicast
1397 * (including broadcast) and unicast frames, the latter can only
1398 * use PTKs and STKs while the former always use GTKs and IGTKs.
1399 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1400 * unicast frames can also use key indices like GTKs. Hence, if we
1401 * don't have a PTK/STK we check the key index for a WEP key.
1402 *
1403 * Note that in a regular BSS, multicast frames are sent by the
1404 * AP only, associated stations unicast the frame to the AP first
1405 * which then multicasts it on their behalf.
1406 *
1407 * There is also a slight problem in IBSS mode: GTKs are negotiated
1408 * with each station, that is something we don't currently handle.
1409 * The spec seems to expect that one negotiates the same key with
1410 * every station but there's no such requirement; VLANs could be
1411 * possible.
1412 */
1413
1414 /*
1415 * No point in finding a key and decrypting if the frame is neither
1416 * addressed to us nor a multicast frame.
1417 */
1418 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1419 return RX_CONTINUE;
1420
1421 /* start without a key */
1422 rx->key = NULL;
2475b1cc 1423 fc = hdr->frame_control;
86c228a7 1424
2475b1cc
MS		 1425 if (rx->sta) {
1426 int keyid = rx->sta->ptk_idx;
86c228a7 1427
2475b1cc
MS		 1428 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1429 cs = rx->sta->cipher_scheme;
1430 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1431 if (unlikely(keyid < 0))
1432 return RX_DROP_UNUSABLE;
1433 }
1434 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1435 }
86c228a7
JA		 1436
1437 if (!ieee80211_has_protected(fc))
1438 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1439
1440 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1441 rx->key = sta_ptk;
1442 if ((status->flag & RX_FLAG_DECRYPTED) &&
1443 (status->flag & RX_FLAG_IV_STRIPPED))
1444 return RX_CONTINUE;
1445 /* Skip decryption if the frame is not protected. */
1446 if (!ieee80211_has_protected(fc))
1447 return RX_CONTINUE;
1448 } else if (mmie_keyidx >= 0) {
1449 /* Broadcast/multicast robust management frame / BIP */
1450 if ((status->flag & RX_FLAG_DECRYPTED) &&
1451 (status->flag & RX_FLAG_IV_STRIPPED))
1452 return RX_CONTINUE;
1453
1454 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1455 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1456 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1457 if (rx->sta)
1458 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1459 if (!rx->key)
1460 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1461 } else if (!ieee80211_has_protected(fc)) {
1462 /*
1463 * The frame was not protected, so skip decryption. However, we
1464 * need to set rx->key if there is a key that could have been
1465 * used so that the frame may be dropped if encryption would
1466 * have been expected.
1467 */
1468 struct ieee80211_key *key = NULL;
1469 struct ieee80211_sub_if_data *sdata = rx->sdata;
1470 int i;
1471
1472 if (ieee80211_is_mgmt(fc) &&
1473 is_multicast_ether_addr(hdr->addr1) &&
1474 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1475 rx->key = key;
1476 else {
1477 if (rx->sta) {
1478 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1479 key = rcu_dereference(rx->sta->gtk[i]);
1480 if (key)
1481 break;
1482 }
1483 }
1484 if (!key) {
1485 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1486 key = rcu_dereference(sdata->keys[i]);
1487 if (key)
1488 break;
1489 }
1490 }
1491 if (key)
1492 rx->key = key;
1493 }
1494 return RX_CONTINUE;
1495 } else {
1496 u8 keyid;
2475b1cc 1497
86c228a7
JA		 1498 /*
1499 * The device doesn't give us the IV so we won't be
1500 * able to look up the key. That's ok though, we
1501 * don't need to decrypt the frame, we just won't
1502 * be able to keep statistics accurate.
1503 * Except for key threshold notifications, should
1504 * we somehow allow the driver to tell us which key
1505 * the hardware used if this flag is set?
1506 */
1507 if ((status->flag & RX_FLAG_DECRYPTED) &&
1508 (status->flag & RX_FLAG_IV_STRIPPED))
1509 return RX_CONTINUE;
1510
1511 hdrlen = ieee80211_hdrlen(fc);
1512
2475b1cc
MS		 1513 if (cs) {
1514 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1515
2475b1cc
MS		 1516 if (unlikely(keyidx < 0))
1517 return RX_DROP_UNUSABLE;
1518 } else {
1519 if (rx->skb->len < 8 + hdrlen)
1520 return RX_DROP_UNUSABLE; /* TODO: count this? */
1521 /*
1522 * no need to call ieee80211_wep_get_keyidx,
1523 * it verifies a bunch of things we've done already
1524 */
1525 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1526 keyidx = keyid >> 6;
1527 }
86c228a7
JA		 1528
1529 /* check per-station GTK first, if multicast packet */
1530 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1531 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1532
1533 /* if not found, try default key */
1534 if (!rx->key) {
1535 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1536
1537 /*
1538 * RSNA-protected unicast frames should always be
1539 * sent with pairwise or station-to-station keys,
1540 * but for WEP we allow using a key index as well.
1541 */
1542 if (rx->key &&
1543 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1544 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1545 !is_multicast_ether_addr(hdr->addr1))
1546 rx->key = NULL;
1547 }
1548 }
1549
1550 if (rx->key) {
1551 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1552 return RX_DROP_MONITOR;
1553
1554 rx->key->tx_rx_count++;
1555 /* TODO: add threshold stuff again */
1556 } else {
1557 return RX_DROP_MONITOR;
1558 }
1559
1560 switch (rx->key->conf.cipher) {
1561 case WLAN_CIPHER_SUITE_WEP40:
1562 case WLAN_CIPHER_SUITE_WEP104:
1563 result = ieee80211_crypto_wep_decrypt(rx);
1564 break;
1565 case WLAN_CIPHER_SUITE_TKIP:
1566 result = ieee80211_crypto_tkip_decrypt(rx);
1567 break;
1568 case WLAN_CIPHER_SUITE_CCMP:
1569 result = ieee80211_crypto_ccmp_decrypt(rx);
1570 break;
1571 case WLAN_CIPHER_SUITE_AES_CMAC:
1572 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1573 break;
1574 default:
2475b1cc 1575 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1576 }
1577
1578 /* the hdr variable is invalid after the decrypt handlers */
1579
1580 /* either the frame has been decrypted or will be dropped */
1581 status->flag |= RX_FLAG_DECRYPTED;
1582
1583 return result;
1584}
1585
571ecf67
JB		 1586static inline struct ieee80211_fragment_entry *
1587ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1588 unsigned int frag, unsigned int seq, int rx_queue,
1589 struct sk_buff **skb)
1590{
1591 struct ieee80211_fragment_entry *entry;
571ecf67 1592
571ecf67
JB		 1593 entry = &sdata->fragments[sdata->fragment_next++];
1594 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1595 sdata->fragment_next = 0;
1596
bdcbd8e0 1597 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1598 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1599
1600 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1601 *skb = NULL;
1602 entry->first_frag_time = jiffies;
1603 entry->seq = seq;
1604 entry->rx_queue = rx_queue;
1605 entry->last_frag = frag;
1606 entry->ccmp = 0;
1607 entry->extra_len = 0;
1608
1609 return entry;
1610}
1611
1612static inline struct ieee80211_fragment_entry *
1613ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1614 unsigned int frag, unsigned int seq,
571ecf67
JB		 1615 int rx_queue, struct ieee80211_hdr *hdr)
1616{
1617 struct ieee80211_fragment_entry *entry;
1618 int i, idx;
1619
1620 idx = sdata->fragment_next;
1621 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1622 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1623
1624 idx--;
1625 if (idx < 0)
1626 idx = IEEE80211_FRAGMENT_MAX - 1;
1627
1628 entry = &sdata->fragments[idx];
1629 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1630 entry->rx_queue != rx_queue ||
1631 entry->last_frag + 1 != frag)
1632 continue;
1633
b73d70ad 1634 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1635
b73d70ad
HH		 1636 /*
1637 * Check ftype and addresses are equal, else check next fragment
1638 */
1639 if (((hdr->frame_control ^ f_hdr->frame_control) &
1640 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1641 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1642 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1643 continue;
1644
ab46623e 1645 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1646 __skb_queue_purge(&entry->skb_list);
1647 continue;
1648 }
1649 return entry;
1650 }
1651
1652 return NULL;
1653}
1654
49461622 1655static ieee80211_rx_result debug_noinline
5cf121c3 1656ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1657{
1658 struct ieee80211_hdr *hdr;
1659 u16 sc;
358c8d9d 1660 __le16 fc;
571ecf67
JB		 1661 unsigned int frag, seq;
1662 struct ieee80211_fragment_entry *entry;
1663 struct sk_buff *skb;
554891e6 1664 struct ieee80211_rx_status *status;
571ecf67 1665
b73d70ad 1666 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1667 fc = hdr->frame_control;
f7fbf70e
JC		 1668
1669 if (ieee80211_is_ctl(fc))
1670 return RX_CONTINUE;
1671
571ecf67
JB		 1672 sc = le16_to_cpu(hdr->seq_ctrl);
1673 frag = sc & IEEE80211_SCTL_FRAG;
1674
358c8d9d 1675 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1676 is_multicast_ether_addr(hdr->addr1))) {
1677 /* not fragmented */
1678 goto out;
1679 }
1680 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1681
e3cf8b3f
ZY		 1682 if (skb_linearize(rx->skb))
1683 return RX_DROP_UNUSABLE;
1684
058897a4
AK		 1685 /*
1686 * skb_linearize() might change the skb->data and
1687 * previously cached variables (in this case, hdr) need to
1688 * be refreshed with the new data.
1689 */
1690 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1691 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1692
1693 if (frag == 0) {
1694 /* This is the first fragment of a new frame. */
1695 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1696 rx->seqno_idx, &(rx->skb));
97359d12 1697 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1698 ieee80211_has_protected(fc)) {
9e26297a 1699 int queue = rx->security_idx;
571ecf67
JB		 1700 /* Store CCMP PN so that we can verify that the next
1701 * fragment has a sequential PN value. */
1702 entry->ccmp = 1;
1703 memcpy(entry->last_pn,
9190252c 1704 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1705 IEEE80211_CCMP_PN_LEN);
571ecf67 1706 }
9ae54c84 1707 return RX_QUEUED;
571ecf67
JB		 1708 }
1709
1710 /* This is a fragment for a frame that should already be pending in
1711 * fragment cache. Add this fragment to the end of the pending entry.
1712 */
9e26297a
JB		 1713 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1714 rx->seqno_idx, hdr);
571ecf67
JB		 1715 if (!entry) {
1716 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1717 return RX_DROP_MONITOR;
571ecf67
JB		 1718 }
1719
1720 /* Verify that MPDUs within one MSDU have sequential PN values.
1721 * (IEEE 802.11i, 8.3.3.4.5) */
1722 if (entry->ccmp) {
1723 int i;
4325f6ca 1724 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1725 int queue;
97359d12 1726 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1727 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1728 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1729 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1730 pn[i]++;
1731 if (pn[i])
1732 break;
1733 }
9e26297a 1734 queue = rx->security_idx;
9190252c 1735 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1736 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1737 return RX_DROP_UNUSABLE;
4325f6ca 1738 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1739 }
1740
358c8d9d 1741 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1742 __skb_queue_tail(&entry->skb_list, rx->skb);
1743 entry->last_frag = frag;
1744 entry->extra_len += rx->skb->len;
358c8d9d 1745 if (ieee80211_has_morefrags(fc)) {
571ecf67 1746 rx->skb = NULL;
9ae54c84 1747 return RX_QUEUED;
571ecf67
JB		 1748 }
1749
1750 rx->skb = __skb_dequeue(&entry->skb_list);
1751 if (skb_tailroom(rx->skb) < entry->extra_len) {
1752 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1753 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1754 GFP_ATOMIC))) {
1755 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1756 __skb_queue_purge(&entry->skb_list);
e4c26add 1757 return RX_DROP_UNUSABLE;
571ecf67
JB		 1758 }
1759 }
1760 while ((skb = __skb_dequeue(&entry->skb_list))) {
1761 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1762 dev_kfree_skb(skb);
1763 }
1764
1765 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1766 status = IEEE80211_SKB_RXCB(rx->skb);
1767 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1768
1769 out:
1770 if (rx->sta)
1771 rx->sta->rx_packets++;
1772 if (is_multicast_ether_addr(hdr->addr1))
1773 rx->local->dot11MulticastReceivedFrameCount++;
1774 else
1775 ieee80211_led_rx(rx->local);
9ae54c84 1776 return RX_CONTINUE;
571ecf67
JB		 1777}
1778
1df332e8 1779static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1780{
1df332e8 1781 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1782 return -EACCES;
571ecf67 1783
76ee65bf 1784 return 0;
571ecf67
JB		 1785}
1786
1df332e8 1787static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1788{
eb9fb5b8
JB		 1789 struct sk_buff *skb = rx->skb;
1790 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1791
3017b80b 1792 /*
7848ba7d
JB		 1793 * Pass through unencrypted frames if the hardware has
1794 * decrypted them already.
3017b80b 1795 */
eb9fb5b8 1796 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1797 return 0;
571ecf67
JB		 1798
1799 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1800 if (unlikely(!ieee80211_has_protected(fc) &&
1801 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1802 ieee80211_is_data(fc) &&
b3fc9c6c 1803 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1804 return -EACCES;
bef5d1c7
JB		 1805
1806 return 0;
1807}
1808
1df332e8 1809static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1810{
1811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1812 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1813 __le16 fc = hdr->frame_control;
bef5d1c7 1814
e3efca0a
JM		 1815 /*
1816 * Pass through unencrypted frames if the hardware has
1817 * decrypted them already.
1818 */
1819 if (status->flag & RX_FLAG_DECRYPTED)
1820 return 0;
bef5d1c7 1821
c2c98fde 1822 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1823 if (unlikely(!ieee80211_has_protected(fc) &&
1824 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1825 rx->key)) {
6ff57cf8
JB		 1826 if (ieee80211_is_deauth(fc) ||
1827 ieee80211_is_disassoc(fc))
1828 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1829 rx->skb->data,
1830 rx->skb->len);
f2ca3ea4 1831 return -EACCES;
cf4e594e 1832 }
f2ca3ea4 1833 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1834 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1835 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1836 if (ieee80211_is_deauth(fc) ||
1837 ieee80211_is_disassoc(fc))
1838 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1839 rx->skb->data,
1840 rx->skb->len);
f2ca3ea4 1841 return -EACCES;
cf4e594e 1842 }
f2ca3ea4
JM		 1843 /*
1844 * When using MFP, Action frames are not allowed prior to
1845 * having configured keys.
1846 */
1847 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1848 ieee80211_is_robust_mgmt_frame(
1849 (struct ieee80211_hdr *) rx->skb->data)))
1850 return -EACCES;
1851 }
b3fc9c6c 1852
76ee65bf 1853 return 0;
571ecf67
JB		 1854}
1855
76ee65bf 1856static int
4114fa21 1857__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1858{
eb9fb5b8 1859 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1860 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1861 bool check_port_control = false;
1862 struct ethhdr *ehdr;
1863 int ret;
f14543ee 1864
4114fa21 1865 *port_control = false;
9bc383de
JB		 1866 if (ieee80211_has_a4(hdr->frame_control) &&
1867 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1868 return -1;
9bc383de 1869
fbb327c5
FF		 1870 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1871 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1872
1873 if (!sdata->u.mgd.use_4addr)
1874 return -1;
1875 else
1876 check_port_control = true;
1877 }
1878
9bc383de 1879 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1880 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1881 return -1;
571ecf67 1882
fbb327c5 1883 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1884 if (ret < 0)
fbb327c5
FF		 1885 return ret;
1886
1887 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1888 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1889 *port_control = true;
1890 else if (check_port_control)
fbb327c5
FF		 1891 return -1;
1892
1893 return 0;
76ee65bf 1894}
571ecf67 1895
ce3edf6d
JB		 1896/*
1897 * requires that rx->skb is a frame with ethernet header
1898 */
358c8d9d 1899static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1900{
c97c23e3 1901 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1902 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1903 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1904
1905 /*
1906 * Allow EAPOL frames to us/the PAE group address regardless
1907 * of whether the frame was encrypted or not.
1908 */
a621fa4d 1909 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1910 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1911 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1912 return true;
1913
1914 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1915 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1916 return false;
1917
1918 return true;
1919}
1920
1921/*
1922 * requires that rx->skb is a frame with ethernet header
1923 */
76ee65bf 1924static void
5cf121c3 1925ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1926{
eb9fb5b8
JB		 1927 struct ieee80211_sub_if_data *sdata = rx->sdata;
1928 struct net_device *dev = sdata->dev;
76ee65bf 1929 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1930 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1931 struct sta_info *dsta;
554891e6 1932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1933
76ee65bf
RR		 1934 skb = rx->skb;
1935 xmit_skb = NULL;
571ecf67 1936
05c914fe
JB		 1937 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1938 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1939 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1940 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1941 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1942 if (is_multicast_ether_addr(ehdr->h_dest)) {
1943 /*
1944 * send multicast frames both to higher layers in
1945 * local net stack and back to the wireless medium
1946 */
76ee65bf 1947 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1948 if (!xmit_skb)
bdcbd8e0 1949 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1950 dev->name);
571ecf67 1951 } else {
abe60632
JB		 1952 dsta = sta_info_get(sdata, skb->data);
1953 if (dsta) {
ce3edf6d
JB		 1954 /*
1955 * The destination station is associated to
1956 * this AP (in this VLAN), so send the frame
1957 * directly to it and do not pass it to local
1958 * net stack.
571ecf67 1959 */
76ee65bf 1960 xmit_skb = skb;
571ecf67
JB		 1961 skb = NULL;
1962 }
571ecf67
JB		 1963 }
1964 }
1965
59d9cb07 1966#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 1967 if (skb) {
1968 /* 'align' will only take the values 0 or 2 here since all
1969 * frames are required to be aligned to 2-byte boundaries
1970 * when being passed to mac80211; the code here works just
1971 * as well if that isn't true, but mac80211 assumes it can
1972 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 1973 */
9e890a1f
JB		 1974 int align;
1975
1976 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 1977 if (align) {
1978 if (WARN_ON(skb_headroom(skb) < 3)) {
1979 dev_kfree_skb(skb);
1980 skb = NULL;
1981 } else {
1982 u8 *data = skb->data;
8ce0b589
ZY		 1983 size_t len = skb_headlen(skb);
1984 skb->data -= align;
1985 memmove(skb->data, data, len);
1986 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1987 }
1988 }
9e890a1f 1989 }
d1c3a37c
JB		 1990#endif
1991
9e890a1f
JB		 1992 if (skb) {
1993 /* deliver to local stack */
1994 skb->protocol = eth_type_trans(skb, dev);
1995 memset(skb->cb, 0, sizeof(skb->cb));
1996 netif_receive_skb(skb);
571ecf67
JB		 1997 }
1998
76ee65bf 1999 if (xmit_skb) {
aef6c928
HS		 2000 /*
2001 * Send to wireless media and increase priority by 256 to
2002 * keep the received priority instead of reclassifying
2003 * the frame (see cfg80211_classify8021d).
2004 */
2005 xmit_skb->priority += 256;
f831e909 2006 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2007 skb_reset_network_header(xmit_skb);
2008 skb_reset_mac_header(xmit_skb);
76ee65bf 2009 dev_queue_xmit(xmit_skb);
571ecf67 2010 }
76ee65bf
RR		 2011}
2012
49461622 2013static ieee80211_rx_result debug_noinline
5cf121c3 2014ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2015{
eb9fb5b8 2016 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2017 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2018 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2019 __le16 fc = hdr->frame_control;
eaf85ca7 2020 struct sk_buff_head frame_list;
554891e6 2021 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2022
358c8d9d 2023 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2024 return RX_CONTINUE;
fd4c7f2f 2025
358c8d9d 2026 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2027 return RX_DROP_MONITOR;
fd4c7f2f 2028
554891e6 2029 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2030 return RX_CONTINUE;
fd4c7f2f 2031
eaf85ca7
ZY		 2032 if (ieee80211_has_a4(hdr->frame_control) &&
2033 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2034 !rx->sdata->u.vlan.sta)
e4c26add 2035 return RX_DROP_UNUSABLE;
fd4c7f2f 2036
eaf85ca7
ZY		 2037 if (is_multicast_ether_addr(hdr->addr1) &&
2038 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2039 rx->sdata->u.vlan.sta) ||
2040 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2041 rx->sdata->u.mgd.use_4addr)))
e4c26add 2042 return RX_DROP_UNUSABLE;
fd4c7f2f 2043
eaf85ca7
ZY		 2044 skb->dev = dev;
2045 __skb_queue_head_init(&frame_list);
fd4c7f2f 2046
e3cf8b3f
ZY		 2047 if (skb_linearize(skb))
2048 return RX_DROP_UNUSABLE;
2049
eaf85ca7
ZY		 2050 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2051 rx->sdata->vif.type,
8b3becad 2052 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2053
eaf85ca7
ZY		 2054 while (!skb_queue_empty(&frame_list)) {
2055 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2056
358c8d9d 2057 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2058 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2059 continue;
2060 }
eaf85ca7
ZY		 2061 dev->stats.rx_packets++;
2062 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2063
2064 ieee80211_deliver_skb(rx);
2065 }
2066
9ae54c84 2067 return RX_QUEUED;
fd4c7f2f
RR		 2068}
2069
bf94e17b 2070#ifdef CONFIG_MAC80211_MESH
b0dee578 2071static ieee80211_rx_result
e32f85f7
LCC		 2072ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2073{
30789eb6
TP		 2074 struct ieee80211_hdr *fwd_hdr, *hdr;
2075 struct ieee80211_tx_info *info;
e32f85f7 2076 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2077 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2078 struct ieee80211_local *local = rx->local;
eb9fb5b8 2079 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2080 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2081 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2082 u16 q, hdrlen;
e32f85f7
LCC		 2083
2084 hdr = (struct ieee80211_hdr *) skb->data;
2085 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2086
2087 /* make sure fixed part of mesh header is there, also checks skb len */
2088 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2089 return RX_DROP_MONITOR;
2090
2091 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2092
2093 /* make sure full mesh header is there, also checks skb len */
2094 if (!pskb_may_pull(rx->skb,
2095 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2096 return RX_DROP_MONITOR;
2097
2098 /* reload pointers */
2099 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2100 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2101
2157fdd6
TP		 2102 /* frame is in RMC, don't forward */
2103 if (ieee80211_is_data(hdr->frame_control) &&
2104 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2105 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2106 return RX_DROP_MONITOR;
2107
555cb715
JC		 2108 if (!ieee80211_is_data(hdr->frame_control) ||
2109 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2110 return RX_CONTINUE;
2111
2112 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2113 return RX_DROP_MONITOR;
2114
43b7b314 2115 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2116 struct mesh_path *mppath;
43b7b314
JC		 2117 char *proxied_addr;
2118 char *mpp_addr;
2119
2120 if (is_multicast_ether_addr(hdr->addr1)) {
2121 mpp_addr = hdr->addr3;
2122 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2123 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2124 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2125 mpp_addr = hdr->addr4;
2126 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2127 } else {
2128 return RX_DROP_MONITOR;
43b7b314 2129 }
79617dee 2130
79617dee 2131 rcu_read_lock();
bf7cd94d 2132 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2133 if (!mppath) {
bf7cd94d 2134 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2135 } else {
2136 spin_lock_bh(&mppath->state_lock);
b203ca39 2137 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2138 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2139 spin_unlock_bh(&mppath->state_lock);
2140 }
2141 rcu_read_unlock();
2142 }
2143
3c5772a5
JC		 2144 /* Frame has reached destination. Don't forward */
2145 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2146 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2147 return RX_CONTINUE;
2148
00e96dec 2149 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2150 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2151 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2152 return RX_DROP_MONITOR;
2153 }
2154 skb_set_queue_mapping(skb, q);
e32f85f7 2155
30789eb6
TP		 2156 if (!--mesh_hdr->ttl) {
2157 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2158 goto out;
30789eb6
TP		 2159 }
2160
d665508b
CYY		 2161 if (!ifmsh->mshcfg.dot11MeshForwarding)
2162 goto out;
2163
30789eb6
TP		 2164 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2165 if (!fwd_skb) {
bdcbd8e0 2166 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2167 sdata->name);
30789eb6
TP		 2168 goto out;
2169 }
2170
2171 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2172 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2173 info = IEEE80211_SKB_CB(fwd_skb);
2174 memset(info, 0, sizeof(*info));
2175 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2176 info->control.vif = &rx->sdata->vif;
2177 info->control.jiffies = jiffies;
2178 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2179 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2180 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2181 /* update power mode indication when forwarding */
2182 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2183 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2184 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2185 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2186 } else {
2187 /* unable to resolve next hop */
bf7cd94d 2188 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2189 fwd_hdr->addr3, 0,
2190 WLAN_REASON_MESH_PATH_NOFORWARD,
2191 fwd_hdr->addr2);
30789eb6 2192 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2193 kfree_skb(fwd_skb);
30789eb6 2194 return RX_DROP_MONITOR;
e32f85f7
LCC		 2195 }
2196
30789eb6
TP		 2197 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2198 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2199 out:
3c5772a5 2200 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2201 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2202 return RX_CONTINUE;
2203 else
2204 return RX_DROP_MONITOR;
2205}
bf94e17b 2206#endif
e32f85f7 2207
49461622 2208static ieee80211_rx_result debug_noinline
5cf121c3 2209ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2210{
eb9fb5b8 2211 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2212 struct ieee80211_local *local = rx->local;
eb9fb5b8 2213 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2214 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2215 __le16 fc = hdr->frame_control;
4114fa21 2216 bool port_control;
ce3edf6d 2217 int err;
76ee65bf 2218
358c8d9d 2219 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2220 return RX_CONTINUE;
76ee65bf 2221
358c8d9d 2222 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2223 return RX_DROP_MONITOR;
76ee65bf 2224
f14543ee 2225 /*
e7f4a940
JB		 2226 * Send unexpected-4addr-frame event to hostapd. For older versions,
2227 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2228 */
2229 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2230 sdata->vif.type == NL80211_IFTYPE_AP) {
2231 if (rx->sta &&
2232 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2233 cfg80211_rx_unexpected_4addr_frame(
2234 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2235 return RX_DROP_MONITOR;
e7f4a940 2236 }
f14543ee 2237
4114fa21 2238 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2239 if (unlikely(err))
e4c26add 2240 return RX_DROP_UNUSABLE;
76ee65bf 2241
358c8d9d 2242 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2243 return RX_DROP_MONITOR;
ce3edf6d 2244
4114fa21
FF		 2245 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2246 unlikely(port_control) && sdata->bss) {
2247 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2248 u.ap);
2249 dev = sdata->dev;
2250 rx->sdata = sdata;
2251 }
2252
76ee65bf
RR		 2253 rx->skb->dev = dev;
2254
2255 dev->stats.rx_packets++;
2256 dev->stats.rx_bytes += rx->skb->len;
2257
08ca944e 2258 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2259 !is_multicast_ether_addr(
2260 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2261 (!local->scanning &&
2262 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2263 mod_timer(&local->dynamic_ps_timer, jiffies +
2264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2265 }
2266
76ee65bf 2267 ieee80211_deliver_skb(rx);
571ecf67 2268
9ae54c84 2269 return RX_QUEUED;
571ecf67
JB		 2270}
2271
49461622 2272static ieee80211_rx_result debug_noinline
f9e124fb 2273ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2274{
71364716 2275 struct sk_buff *skb = rx->skb;
a7767f95 2276 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2277 struct tid_ampdu_rx *tid_agg_rx;
2278 u16 start_seq_num;
2279 u16 tid;
2280
a7767f95 2281 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2282 return RX_CONTINUE;
71364716 2283
a7767f95 2284 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2285 struct {
2286 __le16 control, start_seq_num;
2287 } __packed bar_data;
2288
71364716 2289 if (!rx->sta)
a02ae758 2290 return RX_DROP_MONITOR;
8ae5977f
JB		 2291
2292 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2293 &bar_data, sizeof(bar_data)))
2294 return RX_DROP_MONITOR;
2295
8ae5977f 2296 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2297
2298 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2299 if (!tid_agg_rx)
a02ae758 2300 return RX_DROP_MONITOR;
71364716 2301
8ae5977f 2302 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2303
2304 /* reset session timer */
20ad19d0
JB		 2305 if (tid_agg_rx->timeout)
2306 mod_timer(&tid_agg_rx->session_timer,
2307 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2308
dd318575 2309 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2310 /* release stored frames up to start of BAR */
d3b2fb53 2311 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2312 start_seq_num, frames);
dd318575
JB		 2313 spin_unlock(&tid_agg_rx->reorder_lock);
2314
a02ae758
JB		 2315 kfree_skb(skb);
2316 return RX_QUEUED;
71364716
RR		 2317 }
2318
08daecae
JB		 2319 /*
2320 * After this point, we only want management frames,
2321 * so we can drop all remaining control frames to
2322 * cooked monitor interfaces.
2323 */
2324 return RX_DROP_MONITOR;
71364716
RR		 2325}
2326
f4f727a6
JM		 2327static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2328 struct ieee80211_mgmt *mgmt,
2329 size_t len)
fea14732
JM		 2330{
2331 struct ieee80211_local *local = sdata->local;
2332 struct sk_buff *skb;
2333 struct ieee80211_mgmt *resp;
2334
b203ca39 2335 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2336 /* Not to own unicast address */
2337 return;
2338 }
2339
b203ca39
JP		 2340 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2341 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2342 /* Not from the current AP or not associated yet. */
fea14732
JM		 2343 return;
2344 }
2345
2346 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2347 /* Too short SA Query request frame */
2348 return;
2349 }
2350
2351 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2352 if (skb == NULL)
2353 return;
2354
2355 skb_reserve(skb, local->hw.extra_tx_headroom);
2356 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2357 memset(resp, 0, 24);
2358 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2359 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2360 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2361 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2362 IEEE80211_STYPE_ACTION);
2363 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2364 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2365 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2366 memcpy(resp->u.action.u.sa_query.trans_id,
2367 mgmt->u.action.u.sa_query.trans_id,
2368 WLAN_SA_QUERY_TR_ID_LEN);
2369
62ae67be 2370 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2371}
2372
2e161f78
JB		 2373static ieee80211_rx_result debug_noinline
2374ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2375{
2376 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2377 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2378
2379 /*
2380 * From here on, look only at management frames.
2381 * Data and control frames are already handled,
2382 * and unknown (reserved) frames are useless.
2383 */
2384 if (rx->skb->len < 24)
2385 return RX_DROP_MONITOR;
2386
2387 if (!ieee80211_is_mgmt(mgmt->frame_control))
2388 return RX_DROP_MONITOR;
2389
ee971924
JB		 2390 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2391 ieee80211_is_beacon(mgmt->frame_control) &&
2392 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2393 int sig = 0;
2394
2395 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2396 sig = status->signal;
2397
ee971924
JB		 2398 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2399 rx->skb->data, rx->skb->len,
37c73b5f 2400 status->freq, sig);
ee971924
JB		 2401 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2402 }
2403
554891e6 2404 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2405 return RX_DROP_MONITOR;
2406
2407 if (ieee80211_drop_unencrypted_mgmt(rx))
2408 return RX_DROP_UNUSABLE;
2409
2410 return RX_CONTINUE;
2411}
2412
de1ede7a
JB		 2413static ieee80211_rx_result debug_noinline
2414ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2415{
2416 struct ieee80211_local *local = rx->local;
eb9fb5b8 2417 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2418 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2420 int len = rx->skb->len;
2421
2422 if (!ieee80211_is_action(mgmt->frame_control))
2423 return RX_CONTINUE;
2424
026331c4
JM		 2425 /* drop too small frames */
2426 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2427 return RX_DROP_UNUSABLE;
de1ede7a 2428
815b8092 2429 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2430 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2431 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2432 return RX_DROP_UNUSABLE;
de1ede7a 2433
554891e6 2434 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2435 return RX_DROP_UNUSABLE;
97ebe12a 2436
de1ede7a 2437 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2438 case WLAN_CATEGORY_HT:
2439 /* reject HT action frames from stations not supporting HT */
2440 if (!rx->sta->sta.ht_cap.ht_supported)
2441 goto invalid;
2442
2443 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2444 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2445 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2446 sdata->vif.type != NL80211_IFTYPE_AP &&
2447 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2448 break;
2449
ec61cd63 2450 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2451 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2452 goto invalid;
2453
2454 switch (mgmt->u.action.u.ht_smps.action) {
2455 case WLAN_HT_ACTION_SMPS: {
2456 struct ieee80211_supported_band *sband;
af0ed69b 2457 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2458
2459 /* convert to HT capability */
2460 switch (mgmt->u.action.u.ht_smps.smps_control) {
2461 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2462 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2463 break;
2464 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2465 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2466 break;
2467 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2468 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2469 break;
2470 default:
2471 goto invalid;
2472 }
1d8d3dec
JB		 2473
2474 /* if no change do nothing */
af0ed69b 2475 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2476 goto handled;
af0ed69b 2477 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2478
2479 sband = rx->local->hw.wiphy->bands[status->band];
2480
64f68e5d
JB		 2481 rate_control_rate_update(local, sband, rx->sta,
2482 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2483 goto handled;
2484 }
ec61cd63
JB		 2485 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2486 struct ieee80211_supported_band *sband;
2487 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2488 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2489
2490 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2491 if (!(rx->sta->sta.ht_cap.cap &
2492 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2493 goto handled;
2494
e1a0c6b3
JB		 2495 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2496 new_bw = IEEE80211_STA_RX_BW_20;
2497 else
2498 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2499
e1a0c6b3 2500 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2501 goto handled;
2502
ec61cd63
JB		 2503 sband = rx->local->hw.wiphy->bands[status->band];
2504
2505 rate_control_rate_update(local, sband, rx->sta,
2506 IEEE80211_RC_BW_CHANGED);
2507 goto handled;
2508 }
1d8d3dec
JB		 2509 default:
2510 goto invalid;
2511 }
2512
0af83d3d 2513 break;
1b3a2e49
JB		 2514 case WLAN_CATEGORY_PUBLIC:
2515 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2516 goto invalid;
2517 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2518 break;
2519 if (!rx->sta)
2520 break;
2521 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2522 break;
2523 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2524 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2525 break;
2526 if (len < offsetof(struct ieee80211_mgmt,
2527 u.action.u.ext_chan_switch.variable))
2528 goto invalid;
2529 goto queue;
0af83d3d
JB		 2530 case WLAN_CATEGORY_VHT:
2531 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2532 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2533 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2534 sdata->vif.type != NL80211_IFTYPE_AP &&
2535 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2536 break;
2537
2538 /* verify action code is present */
2539 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2540 goto invalid;
2541
2542 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2543 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2544 u8 opmode;
2545
2546 /* verify opmode is present */
2547 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2548 goto invalid;
2549
2550 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2551
2552 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2553 opmode, status->band,
2554 false);
0af83d3d
JB		 2555 goto handled;
2556 }
2557 default:
2558 break;
2559 }
1d8d3dec 2560 break;
de1ede7a 2561 case WLAN_CATEGORY_BACK:
8abd3f9b 2562 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2563 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2564 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2565 sdata->vif.type != NL80211_IFTYPE_AP &&
2566 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2567 break;
8abd3f9b 2568
026331c4
JM		 2569 /* verify action_code is present */
2570 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2571 break;
2572
de1ede7a
JB		 2573 switch (mgmt->u.action.u.addba_req.action_code) {
2574 case WLAN_ACTION_ADDBA_REQ:
2575 if (len < (IEEE80211_MIN_ACTION_SIZE +
2576 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2577 goto invalid;
2578 break;
de1ede7a
JB		 2579 case WLAN_ACTION_ADDBA_RESP:
2580 if (len < (IEEE80211_MIN_ACTION_SIZE +
2581 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2582 goto invalid;
2583 break;
de1ede7a
JB		 2584 case WLAN_ACTION_DELBA:
2585 if (len < (IEEE80211_MIN_ACTION_SIZE +
2586 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2587 goto invalid;
2588 break;
2589 default:
2590 goto invalid;
de1ede7a 2591 }
bed7ee6e 2592
8b58ff83 2593 goto queue;
39192c0b 2594 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2595 /* verify action_code is present */
2596 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2597 break;
2598
39192c0b
JB		 2599 switch (mgmt->u.action.u.measurement.action_code) {
2600 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2601 if (status->band != IEEE80211_BAND_5GHZ)
2602 break;
2603
39192c0b
JB		 2604 if (len < (IEEE80211_MIN_ACTION_SIZE +
2605 sizeof(mgmt->u.action.u.measurement)))
84040805 2606 break;
cd7760e6
SW		 2607
2608 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2609 break;
2610
39192c0b 2611 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2612 goto handled;
cd7760e6
SW		 2613 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2614 u8 *bssid;
2615 if (len < (IEEE80211_MIN_ACTION_SIZE +
2616 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2617 break;
cc32abd4 2618
cd7760e6 2619 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2620 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2621 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2622 break;
2623
2624 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2625 bssid = sdata->u.mgd.bssid;
2626 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2627 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2628 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2629 bssid = mgmt->sa;
cd7760e6
SW		 2630 else
2631 break;
2632
2633 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2634 break;
c481ec97 2635
8b58ff83 2636 goto queue;
cd7760e6 2637 }
39192c0b
JB		 2638 }
2639 break;
fea14732
JM		 2640 case WLAN_CATEGORY_SA_QUERY:
2641 if (len < (IEEE80211_MIN_ACTION_SIZE +
2642 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2643 break;
2644
fea14732
JM		 2645 switch (mgmt->u.action.u.sa_query.action) {
2646 case WLAN_ACTION_SA_QUERY_REQUEST:
2647 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2648 break;
fea14732 2649 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2650 goto handled;
fea14732
JM		 2651 }
2652 break;
8db09850 2653 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2654 if (len < (IEEE80211_MIN_ACTION_SIZE +
2655 sizeof(mgmt->u.action.u.self_prot.action_code)))
2656 break;
2657
8db09850
TP		 2658 switch (mgmt->u.action.u.self_prot.action_code) {
2659 case WLAN_SP_MESH_PEERING_OPEN:
2660 case WLAN_SP_MESH_PEERING_CLOSE:
2661 case WLAN_SP_MESH_PEERING_CONFIRM:
2662 if (!ieee80211_vif_is_mesh(&sdata->vif))
2663 goto invalid;
a6dad6a2 2664 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2665 /* userspace handles this frame */
2666 break;
2667 goto queue;
2668 case WLAN_SP_MGK_INFORM:
2669 case WLAN_SP_MGK_ACK:
2670 if (!ieee80211_vif_is_mesh(&sdata->vif))
2671 goto invalid;
2672 break;
2673 }
2674 break;
d3aaec8a 2675 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2676 if (len < (IEEE80211_MIN_ACTION_SIZE +
2677 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2678 break;
2679
77a121c3
JB		 2680 if (!ieee80211_vif_is_mesh(&sdata->vif))
2681 break;
25d49e4d 2682 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2683 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2684 break;
2685 goto queue;
84040805 2686 }
026331c4 2687
2e161f78
JB		 2688 return RX_CONTINUE;
2689
bed7ee6e 2690 invalid:
554891e6 2691 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2692 /* will return in the next handlers */
2693 return RX_CONTINUE;
2694
2695 handled:
2696 if (rx->sta)
2697 rx->sta->rx_packets++;
2698 dev_kfree_skb(rx->skb);
2699 return RX_QUEUED;
2700
2701 queue:
2702 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2703 skb_queue_tail(&sdata->skb_queue, rx->skb);
2704 ieee80211_queue_work(&local->hw, &sdata->work);
2705 if (rx->sta)
2706 rx->sta->rx_packets++;
2707 return RX_QUEUED;
2708}
2709
2710static ieee80211_rx_result debug_noinline
2711ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2712{
554891e6 2713 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2714 int sig = 0;
2e161f78
JB		 2715
2716 /* skip known-bad action frames and return them in the next handler */
554891e6 2717 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2718 return RX_CONTINUE;
d7907448 2719
026331c4
JM		 2720 /*
2721 * Getting here means the kernel doesn't know how to handle
2722 * it, but maybe userspace does ... include returned frames
2723 * so userspace can register for those to know whether ones
2724 * it transmitted were processed or returned.
2725 */
026331c4 2726
804483e9
JB		 2727 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2728 sig = status->signal;
2729
71bbc994 2730 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
19504cf5 2731 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2e161f78
JB		 2732 if (rx->sta)
2733 rx->sta->rx_packets++;
2734 dev_kfree_skb(rx->skb);
2735 return RX_QUEUED;
2736 }
2737
2e161f78
JB		 2738 return RX_CONTINUE;
2739}
2740
2741static ieee80211_rx_result debug_noinline
2742ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2743{
2744 struct ieee80211_local *local = rx->local;
2745 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2746 struct sk_buff *nskb;
2747 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2749
2750 if (!ieee80211_is_action(mgmt->frame_control))
2751 return RX_CONTINUE;
2752
2753 /*
2754 * For AP mode, hostapd is responsible for handling any action
2755 * frames that we didn't handle, including returning unknown
2756 * ones. For all other modes we will return them to the sender,
2757 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2758 * 802.11-2012 9.24.4.
2e161f78
JB		 2759 * Newer versions of hostapd shall also use the management frame
2760 * registration mechanisms, but older ones still use cooked
2761 * monitor interfaces so push all frames there.
2762 */
554891e6 2763 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2764 (sdata->vif.type == NL80211_IFTYPE_AP ||
2765 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2766 return RX_DROP_MONITOR;
026331c4 2767
4b5ebccc
JB		 2768 if (is_multicast_ether_addr(mgmt->da))
2769 return RX_DROP_MONITOR;
2770
84040805
JB		 2771 /* do not return rejected action frames */
2772 if (mgmt->u.action.category & 0x80)
2773 return RX_DROP_UNUSABLE;
2774
2775 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2776 GFP_ATOMIC);
2777 if (nskb) {
292b4df6 2778 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2779
292b4df6
JL		 2780 nmgmt->u.action.category |= 0x80;
2781 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2782 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2783
2784 memset(nskb->cb, 0, sizeof(nskb->cb));
2785
07e5a5f5
JB		 2786 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2788
2789 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2790 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2791 IEEE80211_TX_CTL_NO_CCK_RATE;
2792 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2793 info->hw_queue =
2794 local->hw.offchannel_tx_hw_queue;
2795 }
2796
2797 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2798 status->band);
de1ede7a 2799 }
39192c0b
JB		 2800 dev_kfree_skb(rx->skb);
2801 return RX_QUEUED;
de1ede7a
JB		 2802}
2803
49461622 2804static ieee80211_rx_result debug_noinline
5cf121c3 2805ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2806{
eb9fb5b8 2807 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2808 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2809 __le16 stype;
571ecf67 2810
77a121c3 2811 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2812
77a121c3
JB		 2813 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2814 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2815 sdata->vif.type != NL80211_IFTYPE_STATION)
2816 return RX_DROP_MONITOR;
472dbc45 2817
77a121c3 2818 switch (stype) {
66e67e41 2819 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2820 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2821 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2822 /* process for all: mesh, mlme, ibss */
2823 break;
66e67e41
JB		 2824 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2825 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2826 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2827 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2828 if (is_multicast_ether_addr(mgmt->da) &&
2829 !is_broadcast_ether_addr(mgmt->da))
2830 return RX_DROP_MONITOR;
2831
77a121c3
JB		 2832 /* process only for station */
2833 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2834 return RX_DROP_MONITOR;
2835 break;
2836 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2837 /* process only for ibss and mesh */
2838 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2839 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2840 return RX_DROP_MONITOR;
2841 break;
2842 default:
2843 return RX_DROP_MONITOR;
2844 }
f9d540ee 2845
77a121c3 2846 /* queue up frame and kick off work to process it */
c1475ca9 2847 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2848 skb_queue_tail(&sdata->skb_queue, rx->skb);
2849 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2850 if (rx->sta)
2851 rx->sta->rx_packets++;
46900298 2852
77a121c3 2853 return RX_QUEUED;
571ecf67
JB		 2854}
2855
5cf121c3 2856/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2857static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2858 struct ieee80211_rate *rate)
3d30d949
MW		 2859{
2860 struct ieee80211_sub_if_data *sdata;
2861 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2862 struct sk_buff *skb = rx->skb, *skb2;
2863 struct net_device *prev_dev = NULL;
eb9fb5b8 2864 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2865 int needed_headroom;
3d30d949 2866
554891e6
JB		 2867 /*
2868 * If cooked monitor has been processed already, then
2869 * don't do it again. If not, set the flag.
2870 */
2871 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2872 goto out_free_skb;
554891e6 2873 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2874
152c477a
JB		 2875 /* If there are no cooked monitor interfaces, just free the SKB */
2876 if (!local->cooked_mntrs)
2877 goto out_free_skb;
2878
293702a3 2879 /* room for the radiotap header based on driver features */
90b9e446 2880 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2881
293702a3
JB		 2882 if (skb_headroom(skb) < needed_headroom &&
2883 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2884 goto out_free_skb;
3d30d949 2885
293702a3 2886 /* prepend radiotap information */
973ef21a
FF		 2887 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2888 false);
3d30d949
MW		 2889
2890 skb_set_mac_header(skb, 0);
2891 skb->ip_summed = CHECKSUM_UNNECESSARY;
2892 skb->pkt_type = PACKET_OTHERHOST;
2893 skb->protocol = htons(ETH_P_802_2);
2894
2895 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2896 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2897 continue;
2898
05c914fe 2899 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2900 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2901 continue;
2902
2903 if (prev_dev) {
2904 skb2 = skb_clone(skb, GFP_ATOMIC);
2905 if (skb2) {
2906 skb2->dev = prev_dev;
5548a8a1 2907 netif_receive_skb(skb2);
3d30d949
MW		 2908 }
2909 }
2910
2911 prev_dev = sdata->dev;
2912 sdata->dev->stats.rx_packets++;
2913 sdata->dev->stats.rx_bytes += skb->len;
2914 }
2915
2916 if (prev_dev) {
2917 skb->dev = prev_dev;
5548a8a1 2918 netif_receive_skb(skb);
554891e6
JB		 2919 return;
2920 }
3d30d949
MW		 2921
2922 out_free_skb:
2923 dev_kfree_skb(skb);
2924}
2925
aa0c8636
CL		 2926static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2927 ieee80211_rx_result res)
2928{
2929 switch (res) {
2930 case RX_DROP_MONITOR:
2931 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2932 if (rx->sta)
2933 rx->sta->rx_dropped++;
2934 /* fall through */
2935 case RX_CONTINUE: {
2936 struct ieee80211_rate *rate = NULL;
2937 struct ieee80211_supported_band *sband;
2938 struct ieee80211_rx_status *status;
2939
2940 status = IEEE80211_SKB_RXCB((rx->skb));
2941
2942 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2943 if (!(status->flag & RX_FLAG_HT) &&
2944 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2945 rate = &sband->bitrates[status->rate_idx];
2946
2947 ieee80211_rx_cooked_monitor(rx, rate);
2948 break;
2949 }
2950 case RX_DROP_UNUSABLE:
2951 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2952 if (rx->sta)
2953 rx->sta->rx_dropped++;
2954 dev_kfree_skb(rx->skb);
2955 break;
2956 case RX_QUEUED:
2957 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2958 break;
2959 }
2960}
571ecf67 2961
f9e124fb
CL		 2962static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2963 struct sk_buff_head *frames)
58905290 2964{
58905290 2965 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2966 struct sk_buff *skb;
8944b79f 2967
e32f85f7
LCC		 2968#define CALL_RXH(rxh) \
2969 do { \
2970 res = rxh(rx); \
2971 if (res != RX_CONTINUE) \
2569a826 2972 goto rxh_next; \
e32f85f7 2973 } while (0);
49461622 2974
f9e124fb 2975 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2976
f9e124fb 2977 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2978 /*
2979 * all the other fields are valid across frames
2980 * that belong to an aMPDU since they are on the
2981 * same TID from the same station
2982 */
2983 rx->skb = skb;
2984
2569a826 2985 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2986 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 2987 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 2988 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 2989 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2990 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2991 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2992#ifdef CONFIG_MAC80211_MESH
aa0c8636 2993 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2994 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2995#endif
2154c81c 2996 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2997 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2998
2999 /* special treatment -- needs the queue */
3000 res = ieee80211_rx_h_ctrl(rx, frames);
3001 if (res != RX_CONTINUE)
3002 goto rxh_next;
3003
2e161f78 3004 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3005 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3006 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3007 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3008 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3009
aa0c8636
CL		 3010 rxh_next:
3011 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3012
49461622 3013#undef CALL_RXH
aa0c8636 3014 }
24a8fdad 3015
f9e124fb 3016 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3017}
3018
4406c376 3019static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3020{
f9e124fb 3021 struct sk_buff_head reorder_release;
aa0c8636
CL		 3022 ieee80211_rx_result res = RX_DROP_MONITOR;
3023
f9e124fb
CL		 3024 __skb_queue_head_init(&reorder_release);
3025
aa0c8636
CL		 3026#define CALL_RXH(rxh) \
3027 do { \
3028 res = rxh(rx); \
3029 if (res != RX_CONTINUE) \
3030 goto rxh_next; \
3031 } while (0);
3032
aa0c8636
CL		 3033 CALL_RXH(ieee80211_rx_h_check)
3034
f9e124fb 3035 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3036
f9e124fb 3037 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3038 return;
49461622 3039
2569a826 3040 rxh_next:
aa0c8636
CL		 3041 ieee80211_rx_handlers_result(rx, res);
3042
3043#undef CALL_RXH
58905290
JB		 3044}
3045
2bff8ebf 3046/*
dd318575
JB		 3047 * This function makes calls into the RX path, therefore
3048 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3049 */
3050void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3051{
f9e124fb 3052 struct sk_buff_head frames;
554891e6
JB		 3053 struct ieee80211_rx_data rx = {
3054 .sta = sta,
3055 .sdata = sta->sdata,
3056 .local = sta->local,
9e26297a
JB		 3057 /* This is OK -- must be QoS data frame */
3058 .security_idx = tid,
3059 .seqno_idx = tid,
fcf8bd3b 3060 .flags = 0,
554891e6 3061 };
2c15a0cf
CL		 3062 struct tid_ampdu_rx *tid_agg_rx;
3063
3064 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3065 if (!tid_agg_rx)
3066 return;
2bff8ebf 3067
f9e124fb
CL		 3068 __skb_queue_head_init(&frames);
3069
2c15a0cf 3070 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3071 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3072 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3073
f9e124fb 3074 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3075}
3076
571ecf67
JB		 3077/* main receive path */
3078
3c2723f5
JB		 3079static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3080 struct ieee80211_hdr *hdr)
23a24def 3081{
20b01f80 3082 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3083 struct sk_buff *skb = rx->skb;
3084 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3085 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3086 int multicast = is_multicast_ether_addr(hdr->addr1);
3087
51fb61e7 3088 switch (sdata->vif.type) {
05c914fe 3089 case NL80211_IFTYPE_STATION:
9bc383de 3090 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3091 return false;
77fdaa12 3092 if (!multicast &&
b203ca39 3093 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3094 if (!(sdata->dev->flags & IFF_PROMISC) ||
3095 sdata->u.mgd.use_4addr)
3c2723f5 3096 return false;
554891e6 3097 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3098 }
3099 break;
05c914fe 3100 case NL80211_IFTYPE_ADHOC:
23a24def 3101 if (!bssid)
3c2723f5 3102 return false;
6329b8d9
FF		 3103 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3104 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3105 return false;
a7767f95 3106 if (ieee80211_is_beacon(hdr->frame_control)) {
3c2723f5 3107 return true;
d48b2968 3108 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3c2723f5 3109 return false;
23a24def 3110 } else if (!multicast &&
b203ca39 3111 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3112 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3113 return false;
554891e6 3114 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3115 } else if (!rx->sta) {
3116 int rate_idx;
5614618e
JB		 3117 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3118 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3119 else
eb9fb5b8 3120 rate_idx = status->rate_idx;
8bf11d8d
JB		 3121 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3122 BIT(rate_idx));
0fb8ca45 3123 }
23a24def 3124 break;
05c914fe 3125 case NL80211_IFTYPE_MESH_POINT:
6032f934 3126 if (!multicast &&
b203ca39 3127 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934 3128 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3129 return false;
6032f934 3130
554891e6 3131 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3132 }
3133 break;
05c914fe
JB		 3134 case NL80211_IFTYPE_AP_VLAN:
3135 case NL80211_IFTYPE_AP:
23a24def 3136 if (!bssid) {
b203ca39 3137 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3138 return false;
f142c6b9 3139 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3140 /*
3141 * Accept public action frames even when the
3142 * BSSID doesn't match, this is used for P2P
3143 * and location updates. Note that mac80211
3144 * itself never looks at these frames.
3145 */
2b9ccd4e
JB		 3146 if (!multicast &&
3147 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3148 return false;
d48b2968 3149 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3150 return true;
d48b2968 3151 if (!ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3152 return false;
554891e6 3153 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3154 }
23a24def 3155 break;
05c914fe 3156 case NL80211_IFTYPE_WDS:
a7767f95 3157 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3158 return false;
b203ca39 3159 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3c2723f5 3160 return false;
23a24def 3161 break;
f142c6b9
JB		 3162 case NL80211_IFTYPE_P2P_DEVICE:
3163 if (!ieee80211_is_public_action(hdr, skb->len) &&
3164 !ieee80211_is_probe_req(hdr->frame_control) &&
3165 !ieee80211_is_probe_resp(hdr->frame_control) &&
3166 !ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3167 return false;
1b737f88
JB		 3168 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3169 !multicast)
f142c6b9
JB		 3170 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3171 break;
2ca27bcf 3172 default:
fb1c1cd6 3173 /* should never get here */
f142c6b9 3174 WARN_ON_ONCE(1);
fb1c1cd6 3175 break;
23a24def
JB		 3176 }
3177
3c2723f5 3178 return true;
23a24def
JB		 3179}
3180
4406c376
JB		 3181/*
3182 * This function returns whether or not the SKB
3183 * was destined for RX processing or not, which,
3184 * if consume is true, is equivalent to whether
3185 * or not the skb was consumed.
3186 */
3187static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3188 struct sk_buff *skb, bool consume)
3189{
3190 struct ieee80211_local *local = rx->local;
3191 struct ieee80211_sub_if_data *sdata = rx->sdata;
3192 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3193 struct ieee80211_hdr *hdr = (void *)skb->data;
4406c376
JB		 3194
3195 rx->skb = skb;
554891e6 3196 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376 3197
40791942 3198 if (!prepare_for_handlers(rx, hdr))
4406c376
JB		 3199 return false;
3200
4406c376
JB		 3201 if (!consume) {
3202 skb = skb_copy(skb, GFP_ATOMIC);
3203 if (!skb) {
3204 if (net_ratelimit())
3205 wiphy_debug(local->hw.wiphy,
b305dae4 3206 "failed to copy skb for %s\n",
4406c376
JB		 3207 sdata->name);
3208 return true;
3209 }
3210
3211 rx->skb = skb;
3212 }
3213
3214 ieee80211_invoke_rx_handlers(rx);
3215 return true;
3216}
3217
571ecf67 3218/*
6368e4b1
RR		 3219 * This is the actual Rx frames handler. as it blongs to Rx path it must
3220 * be called with rcu_read_lock protection.
571ecf67 3221 */
71ebb4aa 3222static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3223 struct sk_buff *skb)
571ecf67
JB		 3224{
3225 struct ieee80211_local *local = hw_to_local(hw);
3226 struct ieee80211_sub_if_data *sdata;
571ecf67 3227 struct ieee80211_hdr *hdr;
e3cf8b3f 3228 __le16 fc;
5cf121c3 3229 struct ieee80211_rx_data rx;
4406c376 3230 struct ieee80211_sub_if_data *prev;
56af3268 3231 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3232 int err = 0;
571ecf67 3233
e3cf8b3f 3234 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3235 memset(&rx, 0, sizeof(rx));
3236 rx.skb = skb;
3237 rx.local = local;
72abd81b 3238
e3cf8b3f 3239 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3240 local->dot11ReceivedFragmentCount++;
571ecf67 3241
4a4f1a58
JB		 3242 if (ieee80211_is_mgmt(fc)) {
3243 /* drop frame if too short for header */
3244 if (skb->len < ieee80211_hdrlen(fc))
3245 err = -ENOBUFS;
3246 else
3247 err = skb_linearize(skb);
3248 } else {
e3cf8b3f 3249 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3250 }
e3cf8b3f
ZY		 3251
3252 if (err) {
3253 dev_kfree_skb(skb);
3254 return;
3255 }
3256
3257 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3258 ieee80211_parse_qos(&rx);
d1c3a37c 3259 ieee80211_verify_alignment(&rx);
38f3714d 3260
d48b2968
JB		 3261 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3262 ieee80211_is_beacon(hdr->frame_control)))
3263 ieee80211_scan_rx(local, skb);
3264
e3cf8b3f 3265 if (ieee80211_is_data(fc)) {
56af3268 3266 prev_sta = NULL;
4406c376 3267
7852e361 3268 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3269 if (!prev_sta) {
3270 prev_sta = sta;
3271 continue;
3272 }
3273
3274 rx.sta = prev_sta;
3275 rx.sdata = prev_sta->sdata;
4406c376 3276 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3277
56af3268 3278 prev_sta = sta;
4406c376 3279 }
56af3268
BG		 3280
3281 if (prev_sta) {
3282 rx.sta = prev_sta;
3283 rx.sdata = prev_sta->sdata;
3284
4406c376 3285 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3286 return;
8e26d5ad 3287 goto out;
56af3268 3288 }
4406c376
JB		 3289 }
3290
4b0dd98e 3291 prev = NULL;
b2e7771e 3292
4b0dd98e
JB		 3293 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3294 if (!ieee80211_sdata_running(sdata))
3295 continue;
340e11f3 3296
4b0dd98e
JB		 3297 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3298 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3299 continue;
340e11f3 3300
4b0dd98e
JB		 3301 /*
3302 * frame is destined for this interface, but if it's
3303 * not also for the previous one we handle that after
3304 * the loop to avoid copying the SKB once too much
3305 */
4bb29f8c 3306
4b0dd98e 3307 if (!prev) {
abe60632 3308 prev = sdata;
4b0dd98e 3309 continue;
340e11f3 3310 }
4bb29f8c 3311
7852e361 3312 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3313 rx.sdata = prev;
3314 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3315
4b0dd98e
JB		 3316 prev = sdata;
3317 }
3318
3319 if (prev) {
7852e361 3320 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3321 rx.sdata = prev;
4406c376 3322
4b0dd98e
JB		 3323 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3324 return;
571ecf67 3325 }
4406c376 3326
8e26d5ad 3327 out:
4406c376 3328 dev_kfree_skb(skb);
571ecf67 3329}
6368e4b1
RR		 3330
3331/*
3332 * This is the receive path handler. It is called by a low level driver when an
3333 * 802.11 MPDU is received from the hardware.
3334 */
103bf9f7 3335void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3336{
3337 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3338 struct ieee80211_rate *rate = NULL;
3339 struct ieee80211_supported_band *sband;
f1d58c25 3340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3341
d20ef63d
JB		 3342 WARN_ON_ONCE(softirq_count() == 0);
3343
444e3803 3344 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3345 goto drop;
8318d78a
JB		 3346
3347 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3348 if (WARN_ON(!sband))
3349 goto drop;
8318d78a 3350
89c3a8ac
JB		 3351 /*
3352 * If we're suspending, it is possible although not too likely
3353 * that we'd be receiving frames after having already partially
3354 * quiesced the stack. We can't process such frames then since
3355 * that might, for example, cause stations to be added or other
3356 * driver callbacks be invoked.
3357 */
77a980dc
JB		 3358 if (unlikely(local->quiescing || local->suspended))
3359 goto drop;
89c3a8ac 3360
04800ada
AN		 3361 /* We might be during a HW reconfig, prevent Rx for the same reason */
3362 if (unlikely(local->in_reconfig))
3363 goto drop;
3364
ea77f12f
JB		 3365 /*
3366 * The same happens when we're not even started,
3367 * but that's worth a warning.
3368 */
77a980dc
JB		 3369 if (WARN_ON(!local->started))
3370 goto drop;
ea77f12f 3371
fc885189 3372 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3373 /*
fc885189
JB		 3374 * Validate the rate, unless a PLCP error means that
3375 * we probably can't have a valid rate here anyway.
e5d6eb83 3376 */
fc885189
JB		 3377
3378 if (status->flag & RX_FLAG_HT) {
3379 /*
3380 * rate_idx is MCS index, which can be [0-76]
3381 * as documented on:
3382 *
3383 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3384 *
3385 * Anything else would be some sort of driver or
3386 * hardware error. The driver should catch hardware
3387 * errors.
3388 */
444e3803 3389 if (WARN(status->rate_idx > 76,
fc885189
JB		 3390 "Rate marked as an HT rate but passed "
3391 "status->rate_idx is not "
3392 "an MCS index [0-76]: %d (0x%02x)\n",
3393 status->rate_idx,
3394 status->rate_idx))
3395 goto drop;
5614618e
JB		 3396 } else if (status->flag & RX_FLAG_VHT) {
3397 if (WARN_ONCE(status->rate_idx > 9 ||
3398 !status->vht_nss ||
3399 status->vht_nss > 8,
3400 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3401 status->rate_idx, status->vht_nss))
3402 goto drop;
fc885189 3403 } else {
444e3803 3404 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3405 goto drop;
3406 rate = &sband->bitrates[status->rate_idx];
3407 }
0fb8ca45 3408 }
6368e4b1 3409
554891e6
JB		 3410 status->rx_flags = 0;
3411
6368e4b1
RR		 3412 /*
3413 * key references and virtual interfaces are protected using RCU
3414 * and this requires that we are in a read-side RCU section during
3415 * receive processing
3416 */
3417 rcu_read_lock();
3418
3419 /*
3420 * Frames with failed FCS/PLCP checksum are not returned,
3421 * all other frames are returned without radiotap header
3422 * if it was previously present.
3423 * Also, frames with less than 16 bytes are dropped.
3424 */
f1d58c25 3425 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3426 if (!skb) {
3427 rcu_read_unlock();
3428 return;
3429 }
3430
e1e54068
JB		 3431 ieee80211_tpt_led_trig_rx(local,
3432 ((struct ieee80211_hdr *)skb->data)->frame_control,
3433 skb->len);
071d9ac2 3434 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3435
3436 rcu_read_unlock();
77a980dc
JB		 3437
3438 return;
3439 drop:
3440 kfree_skb(skb);
6368e4b1 3441}
103bf9f7 3442EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3443
3444/* This is a version of the rx handler that can be called from hard irq
3445 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3446void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3447{
3448 struct ieee80211_local *local = hw_to_local(hw);
3449
3450 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3451
571ecf67
JB		 3452 skb->pkt_type = IEEE80211_RX_MSG;
3453 skb_queue_tail(&local->skb_queue, skb);
3454 tasklet_schedule(&local->tasklet);
3455}
3456EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)