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mac80211: remove set but unused variables
[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
d8ca16db 602 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 603 return 0;
604
d8ca16db 605 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 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
d8ca16db 613 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 614 return 0;
615
d8ca16db 616 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 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
d8ca16db 629 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 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 &&
d8ca16db 1848 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 1849 return -EACCES;
1850 }
b3fc9c6c 1851
76ee65bf 1852 return 0;
571ecf67
JB		 1853}
1854
76ee65bf 1855static int
4114fa21 1856__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1857{
eb9fb5b8 1858 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1859 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1860 bool check_port_control = false;
1861 struct ethhdr *ehdr;
1862 int ret;
f14543ee 1863
4114fa21 1864 *port_control = false;
9bc383de
JB		 1865 if (ieee80211_has_a4(hdr->frame_control) &&
1866 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1867 return -1;
9bc383de 1868
fbb327c5
FF		 1869 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1870 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1871
1872 if (!sdata->u.mgd.use_4addr)
1873 return -1;
1874 else
1875 check_port_control = true;
1876 }
1877
9bc383de 1878 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1879 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1880 return -1;
571ecf67 1881
fbb327c5 1882 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1883 if (ret < 0)
fbb327c5
FF		 1884 return ret;
1885
1886 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1887 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1888 *port_control = true;
1889 else if (check_port_control)
fbb327c5
FF		 1890 return -1;
1891
1892 return 0;
76ee65bf 1893}
571ecf67 1894
ce3edf6d
JB		 1895/*
1896 * requires that rx->skb is a frame with ethernet header
1897 */
358c8d9d 1898static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1899{
c97c23e3 1900 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1901 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1902 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1903
1904 /*
1905 * Allow EAPOL frames to us/the PAE group address regardless
1906 * of whether the frame was encrypted or not.
1907 */
a621fa4d 1908 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1909 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1910 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1911 return true;
1912
1913 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1914 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1915 return false;
1916
1917 return true;
1918}
1919
1920/*
1921 * requires that rx->skb is a frame with ethernet header
1922 */
76ee65bf 1923static void
5cf121c3 1924ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1925{
eb9fb5b8
JB		 1926 struct ieee80211_sub_if_data *sdata = rx->sdata;
1927 struct net_device *dev = sdata->dev;
76ee65bf 1928 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1929 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1930 struct sta_info *dsta;
554891e6 1931 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1932
76ee65bf
RR		 1933 skb = rx->skb;
1934 xmit_skb = NULL;
571ecf67 1935
05c914fe
JB		 1936 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1937 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1938 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1939 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1940 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1941 if (is_multicast_ether_addr(ehdr->h_dest)) {
1942 /*
1943 * send multicast frames both to higher layers in
1944 * local net stack and back to the wireless medium
1945 */
76ee65bf 1946 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1947 if (!xmit_skb)
bdcbd8e0 1948 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1949 dev->name);
571ecf67 1950 } else {
abe60632
JB		 1951 dsta = sta_info_get(sdata, skb->data);
1952 if (dsta) {
ce3edf6d
JB		 1953 /*
1954 * The destination station is associated to
1955 * this AP (in this VLAN), so send the frame
1956 * directly to it and do not pass it to local
1957 * net stack.
571ecf67 1958 */
76ee65bf 1959 xmit_skb = skb;
571ecf67
JB		 1960 skb = NULL;
1961 }
571ecf67
JB		 1962 }
1963 }
1964
59d9cb07 1965#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 1966 if (skb) {
1967 /* 'align' will only take the values 0 or 2 here since all
1968 * frames are required to be aligned to 2-byte boundaries
1969 * when being passed to mac80211; the code here works just
1970 * as well if that isn't true, but mac80211 assumes it can
1971 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 1972 */
9e890a1f
JB		 1973 int align;
1974
1975 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 1976 if (align) {
1977 if (WARN_ON(skb_headroom(skb) < 3)) {
1978 dev_kfree_skb(skb);
1979 skb = NULL;
1980 } else {
1981 u8 *data = skb->data;
8ce0b589
ZY		 1982 size_t len = skb_headlen(skb);
1983 skb->data -= align;
1984 memmove(skb->data, data, len);
1985 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1986 }
1987 }
9e890a1f 1988 }
d1c3a37c
JB		 1989#endif
1990
9e890a1f
JB		 1991 if (skb) {
1992 /* deliver to local stack */
1993 skb->protocol = eth_type_trans(skb, dev);
1994 memset(skb->cb, 0, sizeof(skb->cb));
1995 netif_receive_skb(skb);
571ecf67
JB		 1996 }
1997
76ee65bf 1998 if (xmit_skb) {
aef6c928
HS		 1999 /*
2000 * Send to wireless media and increase priority by 256 to
2001 * keep the received priority instead of reclassifying
2002 * the frame (see cfg80211_classify8021d).
2003 */
2004 xmit_skb->priority += 256;
f831e909 2005 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2006 skb_reset_network_header(xmit_skb);
2007 skb_reset_mac_header(xmit_skb);
76ee65bf 2008 dev_queue_xmit(xmit_skb);
571ecf67 2009 }
76ee65bf
RR		 2010}
2011
49461622 2012static ieee80211_rx_result debug_noinline
5cf121c3 2013ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2014{
eb9fb5b8 2015 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2016 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2017 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2018 __le16 fc = hdr->frame_control;
eaf85ca7 2019 struct sk_buff_head frame_list;
554891e6 2020 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2021
358c8d9d 2022 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2023 return RX_CONTINUE;
fd4c7f2f 2024
358c8d9d 2025 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2026 return RX_DROP_MONITOR;
fd4c7f2f 2027
554891e6 2028 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2029 return RX_CONTINUE;
fd4c7f2f 2030
eaf85ca7
ZY		 2031 if (ieee80211_has_a4(hdr->frame_control) &&
2032 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2033 !rx->sdata->u.vlan.sta)
e4c26add 2034 return RX_DROP_UNUSABLE;
fd4c7f2f 2035
eaf85ca7
ZY		 2036 if (is_multicast_ether_addr(hdr->addr1) &&
2037 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2038 rx->sdata->u.vlan.sta) ||
2039 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2040 rx->sdata->u.mgd.use_4addr)))
e4c26add 2041 return RX_DROP_UNUSABLE;
fd4c7f2f 2042
eaf85ca7
ZY		 2043 skb->dev = dev;
2044 __skb_queue_head_init(&frame_list);
fd4c7f2f 2045
e3cf8b3f
ZY		 2046 if (skb_linearize(skb))
2047 return RX_DROP_UNUSABLE;
2048
eaf85ca7
ZY		 2049 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2050 rx->sdata->vif.type,
8b3becad 2051 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2052
eaf85ca7
ZY		 2053 while (!skb_queue_empty(&frame_list)) {
2054 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2055
358c8d9d 2056 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2057 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2058 continue;
2059 }
eaf85ca7
ZY		 2060 dev->stats.rx_packets++;
2061 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2062
2063 ieee80211_deliver_skb(rx);
2064 }
2065
9ae54c84 2066 return RX_QUEUED;
fd4c7f2f
RR		 2067}
2068
bf94e17b 2069#ifdef CONFIG_MAC80211_MESH
b0dee578 2070static ieee80211_rx_result
e32f85f7
LCC		 2071ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2072{
30789eb6
TP		 2073 struct ieee80211_hdr *fwd_hdr, *hdr;
2074 struct ieee80211_tx_info *info;
e32f85f7 2075 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2076 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2077 struct ieee80211_local *local = rx->local;
eb9fb5b8 2078 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2079 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2080 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2081 u16 q, hdrlen;
e32f85f7
LCC		 2082
2083 hdr = (struct ieee80211_hdr *) skb->data;
2084 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2085
2086 /* make sure fixed part of mesh header is there, also checks skb len */
2087 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2088 return RX_DROP_MONITOR;
2089
2090 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2091
2092 /* make sure full mesh header is there, also checks skb len */
2093 if (!pskb_may_pull(rx->skb,
2094 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2095 return RX_DROP_MONITOR;
2096
2097 /* reload pointers */
2098 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2099 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2100
2157fdd6
TP		 2101 /* frame is in RMC, don't forward */
2102 if (ieee80211_is_data(hdr->frame_control) &&
2103 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2104 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2105 return RX_DROP_MONITOR;
2106
555cb715
JC		 2107 if (!ieee80211_is_data(hdr->frame_control) ||
2108 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2109 return RX_CONTINUE;
2110
2111 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2112 return RX_DROP_MONITOR;
2113
43b7b314 2114 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2115 struct mesh_path *mppath;
43b7b314
JC		 2116 char *proxied_addr;
2117 char *mpp_addr;
2118
2119 if (is_multicast_ether_addr(hdr->addr1)) {
2120 mpp_addr = hdr->addr3;
2121 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2122 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2123 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2124 mpp_addr = hdr->addr4;
2125 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2126 } else {
2127 return RX_DROP_MONITOR;
43b7b314 2128 }
79617dee 2129
79617dee 2130 rcu_read_lock();
bf7cd94d 2131 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2132 if (!mppath) {
bf7cd94d 2133 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2134 } else {
2135 spin_lock_bh(&mppath->state_lock);
b203ca39 2136 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2137 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2138 spin_unlock_bh(&mppath->state_lock);
2139 }
2140 rcu_read_unlock();
2141 }
2142
3c5772a5
JC		 2143 /* Frame has reached destination. Don't forward */
2144 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2145 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2146 return RX_CONTINUE;
2147
00e96dec 2148 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2149 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2150 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2151 return RX_DROP_MONITOR;
2152 }
2153 skb_set_queue_mapping(skb, q);
e32f85f7 2154
30789eb6
TP		 2155 if (!--mesh_hdr->ttl) {
2156 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2157 goto out;
30789eb6
TP		 2158 }
2159
d665508b
CYY		 2160 if (!ifmsh->mshcfg.dot11MeshForwarding)
2161 goto out;
2162
30789eb6
TP		 2163 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2164 if (!fwd_skb) {
bdcbd8e0 2165 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2166 sdata->name);
30789eb6
TP		 2167 goto out;
2168 }
2169
2170 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2171 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2172 info = IEEE80211_SKB_CB(fwd_skb);
2173 memset(info, 0, sizeof(*info));
2174 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2175 info->control.vif = &rx->sdata->vif;
2176 info->control.jiffies = jiffies;
2177 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2178 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2179 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2180 /* update power mode indication when forwarding */
2181 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2182 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2183 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2184 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2185 } else {
2186 /* unable to resolve next hop */
bf7cd94d 2187 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2188 fwd_hdr->addr3, 0,
2189 WLAN_REASON_MESH_PATH_NOFORWARD,
2190 fwd_hdr->addr2);
30789eb6 2191 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2192 kfree_skb(fwd_skb);
30789eb6 2193 return RX_DROP_MONITOR;
e32f85f7
LCC		 2194 }
2195
30789eb6
TP		 2196 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2197 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2198 out:
3c5772a5 2199 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2200 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2201 return RX_CONTINUE;
2202 else
2203 return RX_DROP_MONITOR;
2204}
bf94e17b 2205#endif
e32f85f7 2206
49461622 2207static ieee80211_rx_result debug_noinline
5cf121c3 2208ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2209{
eb9fb5b8 2210 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2211 struct ieee80211_local *local = rx->local;
eb9fb5b8 2212 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2214 __le16 fc = hdr->frame_control;
4114fa21 2215 bool port_control;
ce3edf6d 2216 int err;
76ee65bf 2217
358c8d9d 2218 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2219 return RX_CONTINUE;
76ee65bf 2220
358c8d9d 2221 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2222 return RX_DROP_MONITOR;
76ee65bf 2223
f14543ee 2224 /*
e7f4a940
JB		 2225 * Send unexpected-4addr-frame event to hostapd. For older versions,
2226 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2227 */
2228 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2229 sdata->vif.type == NL80211_IFTYPE_AP) {
2230 if (rx->sta &&
2231 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2232 cfg80211_rx_unexpected_4addr_frame(
2233 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2234 return RX_DROP_MONITOR;
e7f4a940 2235 }
f14543ee 2236
4114fa21 2237 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2238 if (unlikely(err))
e4c26add 2239 return RX_DROP_UNUSABLE;
76ee65bf 2240
358c8d9d 2241 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2242 return RX_DROP_MONITOR;
ce3edf6d 2243
4114fa21
FF		 2244 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2245 unlikely(port_control) && sdata->bss) {
2246 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2247 u.ap);
2248 dev = sdata->dev;
2249 rx->sdata = sdata;
2250 }
2251
76ee65bf
RR		 2252 rx->skb->dev = dev;
2253
2254 dev->stats.rx_packets++;
2255 dev->stats.rx_bytes += rx->skb->len;
2256
08ca944e 2257 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2258 !is_multicast_ether_addr(
2259 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2260 (!local->scanning &&
2261 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2262 mod_timer(&local->dynamic_ps_timer, jiffies +
2263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2264 }
2265
76ee65bf 2266 ieee80211_deliver_skb(rx);
571ecf67 2267
9ae54c84 2268 return RX_QUEUED;
571ecf67
JB		 2269}
2270
49461622 2271static ieee80211_rx_result debug_noinline
f9e124fb 2272ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2273{
71364716 2274 struct sk_buff *skb = rx->skb;
a7767f95 2275 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2276 struct tid_ampdu_rx *tid_agg_rx;
2277 u16 start_seq_num;
2278 u16 tid;
2279
a7767f95 2280 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2281 return RX_CONTINUE;
71364716 2282
a7767f95 2283 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2284 struct {
2285 __le16 control, start_seq_num;
2286 } __packed bar_data;
2287
71364716 2288 if (!rx->sta)
a02ae758 2289 return RX_DROP_MONITOR;
8ae5977f
JB		 2290
2291 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2292 &bar_data, sizeof(bar_data)))
2293 return RX_DROP_MONITOR;
2294
8ae5977f 2295 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2296
2297 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2298 if (!tid_agg_rx)
a02ae758 2299 return RX_DROP_MONITOR;
71364716 2300
8ae5977f 2301 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2302
2303 /* reset session timer */
20ad19d0
JB		 2304 if (tid_agg_rx->timeout)
2305 mod_timer(&tid_agg_rx->session_timer,
2306 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2307
dd318575 2308 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2309 /* release stored frames up to start of BAR */
d3b2fb53 2310 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2311 start_seq_num, frames);
dd318575
JB		 2312 spin_unlock(&tid_agg_rx->reorder_lock);
2313
a02ae758
JB		 2314 kfree_skb(skb);
2315 return RX_QUEUED;
71364716
RR		 2316 }
2317
08daecae
JB		 2318 /*
2319 * After this point, we only want management frames,
2320 * so we can drop all remaining control frames to
2321 * cooked monitor interfaces.
2322 */
2323 return RX_DROP_MONITOR;
71364716
RR		 2324}
2325
f4f727a6
JM		 2326static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2327 struct ieee80211_mgmt *mgmt,
2328 size_t len)
fea14732
JM		 2329{
2330 struct ieee80211_local *local = sdata->local;
2331 struct sk_buff *skb;
2332 struct ieee80211_mgmt *resp;
2333
b203ca39 2334 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2335 /* Not to own unicast address */
2336 return;
2337 }
2338
b203ca39
JP		 2339 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2340 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2341 /* Not from the current AP or not associated yet. */
fea14732
JM		 2342 return;
2343 }
2344
2345 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2346 /* Too short SA Query request frame */
2347 return;
2348 }
2349
2350 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2351 if (skb == NULL)
2352 return;
2353
2354 skb_reserve(skb, local->hw.extra_tx_headroom);
2355 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2356 memset(resp, 0, 24);
2357 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2358 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2359 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2360 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2361 IEEE80211_STYPE_ACTION);
2362 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2363 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2364 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2365 memcpy(resp->u.action.u.sa_query.trans_id,
2366 mgmt->u.action.u.sa_query.trans_id,
2367 WLAN_SA_QUERY_TR_ID_LEN);
2368
62ae67be 2369 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2370}
2371
2e161f78
JB		 2372static ieee80211_rx_result debug_noinline
2373ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2374{
2375 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2377
2378 /*
2379 * From here on, look only at management frames.
2380 * Data and control frames are already handled,
2381 * and unknown (reserved) frames are useless.
2382 */
2383 if (rx->skb->len < 24)
2384 return RX_DROP_MONITOR;
2385
2386 if (!ieee80211_is_mgmt(mgmt->frame_control))
2387 return RX_DROP_MONITOR;
2388
ee971924
JB		 2389 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2390 ieee80211_is_beacon(mgmt->frame_control) &&
2391 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2392 int sig = 0;
2393
2394 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2395 sig = status->signal;
2396
ee971924
JB		 2397 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2398 rx->skb->data, rx->skb->len,
37c73b5f 2399 status->freq, sig);
ee971924
JB		 2400 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2401 }
2402
554891e6 2403 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2404 return RX_DROP_MONITOR;
2405
2406 if (ieee80211_drop_unencrypted_mgmt(rx))
2407 return RX_DROP_UNUSABLE;
2408
2409 return RX_CONTINUE;
2410}
2411
de1ede7a
JB		 2412static ieee80211_rx_result debug_noinline
2413ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2414{
2415 struct ieee80211_local *local = rx->local;
eb9fb5b8 2416 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2417 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2418 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2419 int len = rx->skb->len;
2420
2421 if (!ieee80211_is_action(mgmt->frame_control))
2422 return RX_CONTINUE;
2423
026331c4
JM		 2424 /* drop too small frames */
2425 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2426 return RX_DROP_UNUSABLE;
de1ede7a 2427
815b8092 2428 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2429 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2430 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2431 return RX_DROP_UNUSABLE;
de1ede7a 2432
554891e6 2433 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2434 return RX_DROP_UNUSABLE;
97ebe12a 2435
de1ede7a 2436 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2437 case WLAN_CATEGORY_HT:
2438 /* reject HT action frames from stations not supporting HT */
2439 if (!rx->sta->sta.ht_cap.ht_supported)
2440 goto invalid;
2441
2442 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2443 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2444 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2445 sdata->vif.type != NL80211_IFTYPE_AP &&
2446 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2447 break;
2448
ec61cd63 2449 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2450 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2451 goto invalid;
2452
2453 switch (mgmt->u.action.u.ht_smps.action) {
2454 case WLAN_HT_ACTION_SMPS: {
2455 struct ieee80211_supported_band *sband;
af0ed69b 2456 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2457
2458 /* convert to HT capability */
2459 switch (mgmt->u.action.u.ht_smps.smps_control) {
2460 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2461 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2462 break;
2463 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2464 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2465 break;
2466 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2467 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2468 break;
2469 default:
2470 goto invalid;
2471 }
1d8d3dec
JB		 2472
2473 /* if no change do nothing */
af0ed69b 2474 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2475 goto handled;
af0ed69b 2476 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2477
2478 sband = rx->local->hw.wiphy->bands[status->band];
2479
64f68e5d
JB		 2480 rate_control_rate_update(local, sband, rx->sta,
2481 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2482 goto handled;
2483 }
ec61cd63
JB		 2484 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2485 struct ieee80211_supported_band *sband;
2486 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2487 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2488
2489 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2490 if (!(rx->sta->sta.ht_cap.cap &
2491 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2492 goto handled;
2493
e1a0c6b3
JB		 2494 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2495 new_bw = IEEE80211_STA_RX_BW_20;
2496 else
2497 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2498
e1a0c6b3 2499 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2500 goto handled;
2501
ec61cd63
JB		 2502 sband = rx->local->hw.wiphy->bands[status->band];
2503
2504 rate_control_rate_update(local, sband, rx->sta,
2505 IEEE80211_RC_BW_CHANGED);
2506 goto handled;
2507 }
1d8d3dec
JB		 2508 default:
2509 goto invalid;
2510 }
2511
0af83d3d 2512 break;
1b3a2e49
JB		 2513 case WLAN_CATEGORY_PUBLIC:
2514 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2515 goto invalid;
2516 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2517 break;
2518 if (!rx->sta)
2519 break;
2520 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2521 break;
2522 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2523 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2524 break;
2525 if (len < offsetof(struct ieee80211_mgmt,
2526 u.action.u.ext_chan_switch.variable))
2527 goto invalid;
2528 goto queue;
0af83d3d
JB		 2529 case WLAN_CATEGORY_VHT:
2530 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2531 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2532 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2533 sdata->vif.type != NL80211_IFTYPE_AP &&
2534 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2535 break;
2536
2537 /* verify action code is present */
2538 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2539 goto invalid;
2540
2541 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2542 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2543 u8 opmode;
2544
2545 /* verify opmode is present */
2546 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2547 goto invalid;
2548
2549 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2550
2551 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2552 opmode, status->band,
2553 false);
0af83d3d
JB		 2554 goto handled;
2555 }
2556 default:
2557 break;
2558 }
1d8d3dec 2559 break;
de1ede7a 2560 case WLAN_CATEGORY_BACK:
8abd3f9b 2561 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2562 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2563 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2564 sdata->vif.type != NL80211_IFTYPE_AP &&
2565 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2566 break;
8abd3f9b 2567
026331c4
JM		 2568 /* verify action_code is present */
2569 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2570 break;
2571
de1ede7a
JB		 2572 switch (mgmt->u.action.u.addba_req.action_code) {
2573 case WLAN_ACTION_ADDBA_REQ:
2574 if (len < (IEEE80211_MIN_ACTION_SIZE +
2575 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2576 goto invalid;
2577 break;
de1ede7a
JB		 2578 case WLAN_ACTION_ADDBA_RESP:
2579 if (len < (IEEE80211_MIN_ACTION_SIZE +
2580 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2581 goto invalid;
2582 break;
de1ede7a
JB		 2583 case WLAN_ACTION_DELBA:
2584 if (len < (IEEE80211_MIN_ACTION_SIZE +
2585 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2586 goto invalid;
2587 break;
2588 default:
2589 goto invalid;
de1ede7a 2590 }
bed7ee6e 2591
8b58ff83 2592 goto queue;
39192c0b 2593 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2594 /* verify action_code is present */
2595 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2596 break;
2597
39192c0b
JB		 2598 switch (mgmt->u.action.u.measurement.action_code) {
2599 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2600 if (status->band != IEEE80211_BAND_5GHZ)
2601 break;
2602
39192c0b
JB		 2603 if (len < (IEEE80211_MIN_ACTION_SIZE +
2604 sizeof(mgmt->u.action.u.measurement)))
84040805 2605 break;
cd7760e6
SW		 2606
2607 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2608 break;
2609
39192c0b 2610 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2611 goto handled;
cd7760e6
SW		 2612 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2613 u8 *bssid;
2614 if (len < (IEEE80211_MIN_ACTION_SIZE +
2615 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2616 break;
cc32abd4 2617
cd7760e6 2618 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2619 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2620 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2621 break;
2622
2623 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2624 bssid = sdata->u.mgd.bssid;
2625 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2626 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2627 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2628 bssid = mgmt->sa;
cd7760e6
SW		 2629 else
2630 break;
2631
2632 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2633 break;
c481ec97 2634
8b58ff83 2635 goto queue;
cd7760e6 2636 }
39192c0b
JB		 2637 }
2638 break;
fea14732
JM		 2639 case WLAN_CATEGORY_SA_QUERY:
2640 if (len < (IEEE80211_MIN_ACTION_SIZE +
2641 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2642 break;
2643
fea14732
JM		 2644 switch (mgmt->u.action.u.sa_query.action) {
2645 case WLAN_ACTION_SA_QUERY_REQUEST:
2646 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2647 break;
fea14732 2648 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2649 goto handled;
fea14732
JM		 2650 }
2651 break;
8db09850 2652 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2653 if (len < (IEEE80211_MIN_ACTION_SIZE +
2654 sizeof(mgmt->u.action.u.self_prot.action_code)))
2655 break;
2656
8db09850
TP		 2657 switch (mgmt->u.action.u.self_prot.action_code) {
2658 case WLAN_SP_MESH_PEERING_OPEN:
2659 case WLAN_SP_MESH_PEERING_CLOSE:
2660 case WLAN_SP_MESH_PEERING_CONFIRM:
2661 if (!ieee80211_vif_is_mesh(&sdata->vif))
2662 goto invalid;
a6dad6a2 2663 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2664 /* userspace handles this frame */
2665 break;
2666 goto queue;
2667 case WLAN_SP_MGK_INFORM:
2668 case WLAN_SP_MGK_ACK:
2669 if (!ieee80211_vif_is_mesh(&sdata->vif))
2670 goto invalid;
2671 break;
2672 }
2673 break;
d3aaec8a 2674 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2675 if (len < (IEEE80211_MIN_ACTION_SIZE +
2676 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2677 break;
2678
77a121c3
JB		 2679 if (!ieee80211_vif_is_mesh(&sdata->vif))
2680 break;
25d49e4d 2681 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2682 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2683 break;
2684 goto queue;
84040805 2685 }
026331c4 2686
2e161f78
JB		 2687 return RX_CONTINUE;
2688
bed7ee6e 2689 invalid:
554891e6 2690 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2691 /* will return in the next handlers */
2692 return RX_CONTINUE;
2693
2694 handled:
2695 if (rx->sta)
2696 rx->sta->rx_packets++;
2697 dev_kfree_skb(rx->skb);
2698 return RX_QUEUED;
2699
2700 queue:
2701 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2702 skb_queue_tail(&sdata->skb_queue, rx->skb);
2703 ieee80211_queue_work(&local->hw, &sdata->work);
2704 if (rx->sta)
2705 rx->sta->rx_packets++;
2706 return RX_QUEUED;
2707}
2708
2709static ieee80211_rx_result debug_noinline
2710ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2711{
554891e6 2712 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2713 int sig = 0;
2e161f78
JB		 2714
2715 /* skip known-bad action frames and return them in the next handler */
554891e6 2716 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2717 return RX_CONTINUE;
d7907448 2718
026331c4
JM		 2719 /*
2720 * Getting here means the kernel doesn't know how to handle
2721 * it, but maybe userspace does ... include returned frames
2722 * so userspace can register for those to know whether ones
2723 * it transmitted were processed or returned.
2724 */
026331c4 2725
804483e9
JB		 2726 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2727 sig = status->signal;
2728
71bbc994 2729 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
19504cf5 2730 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2e161f78
JB		 2731 if (rx->sta)
2732 rx->sta->rx_packets++;
2733 dev_kfree_skb(rx->skb);
2734 return RX_QUEUED;
2735 }
2736
2e161f78
JB		 2737 return RX_CONTINUE;
2738}
2739
2740static ieee80211_rx_result debug_noinline
2741ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2742{
2743 struct ieee80211_local *local = rx->local;
2744 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2745 struct sk_buff *nskb;
2746 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2748
2749 if (!ieee80211_is_action(mgmt->frame_control))
2750 return RX_CONTINUE;
2751
2752 /*
2753 * For AP mode, hostapd is responsible for handling any action
2754 * frames that we didn't handle, including returning unknown
2755 * ones. For all other modes we will return them to the sender,
2756 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2757 * 802.11-2012 9.24.4.
2e161f78
JB		 2758 * Newer versions of hostapd shall also use the management frame
2759 * registration mechanisms, but older ones still use cooked
2760 * monitor interfaces so push all frames there.
2761 */
554891e6 2762 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2763 (sdata->vif.type == NL80211_IFTYPE_AP ||
2764 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2765 return RX_DROP_MONITOR;
026331c4 2766
4b5ebccc
JB		 2767 if (is_multicast_ether_addr(mgmt->da))
2768 return RX_DROP_MONITOR;
2769
84040805
JB		 2770 /* do not return rejected action frames */
2771 if (mgmt->u.action.category & 0x80)
2772 return RX_DROP_UNUSABLE;
2773
2774 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2775 GFP_ATOMIC);
2776 if (nskb) {
292b4df6 2777 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2778
292b4df6
JL		 2779 nmgmt->u.action.category |= 0x80;
2780 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2781 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2782
2783 memset(nskb->cb, 0, sizeof(nskb->cb));
2784
07e5a5f5
JB		 2785 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2786 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2787
2788 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2789 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2790 IEEE80211_TX_CTL_NO_CCK_RATE;
2791 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2792 info->hw_queue =
2793 local->hw.offchannel_tx_hw_queue;
2794 }
2795
2796 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2797 status->band);
de1ede7a 2798 }
39192c0b
JB		 2799 dev_kfree_skb(rx->skb);
2800 return RX_QUEUED;
de1ede7a
JB		 2801}
2802
49461622 2803static ieee80211_rx_result debug_noinline
5cf121c3 2804ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2805{
eb9fb5b8 2806 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2807 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2808 __le16 stype;
571ecf67 2809
77a121c3 2810 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2811
77a121c3
JB		 2812 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2813 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2814 sdata->vif.type != NL80211_IFTYPE_STATION)
2815 return RX_DROP_MONITOR;
472dbc45 2816
77a121c3 2817 switch (stype) {
66e67e41 2818 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2819 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2820 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2821 /* process for all: mesh, mlme, ibss */
2822 break;
66e67e41
JB		 2823 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2824 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2825 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2826 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2827 if (is_multicast_ether_addr(mgmt->da) &&
2828 !is_broadcast_ether_addr(mgmt->da))
2829 return RX_DROP_MONITOR;
2830
77a121c3
JB		 2831 /* process only for station */
2832 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2833 return RX_DROP_MONITOR;
2834 break;
2835 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2836 /* process only for ibss and mesh */
2837 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2838 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2839 return RX_DROP_MONITOR;
2840 break;
2841 default:
2842 return RX_DROP_MONITOR;
2843 }
f9d540ee 2844
77a121c3 2845 /* queue up frame and kick off work to process it */
c1475ca9 2846 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2847 skb_queue_tail(&sdata->skb_queue, rx->skb);
2848 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2849 if (rx->sta)
2850 rx->sta->rx_packets++;
46900298 2851
77a121c3 2852 return RX_QUEUED;
571ecf67
JB		 2853}
2854
5cf121c3 2855/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2856static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2857 struct ieee80211_rate *rate)
3d30d949
MW		 2858{
2859 struct ieee80211_sub_if_data *sdata;
2860 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2861 struct sk_buff *skb = rx->skb, *skb2;
2862 struct net_device *prev_dev = NULL;
eb9fb5b8 2863 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2864 int needed_headroom;
3d30d949 2865
554891e6
JB		 2866 /*
2867 * If cooked monitor has been processed already, then
2868 * don't do it again. If not, set the flag.
2869 */
2870 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2871 goto out_free_skb;
554891e6 2872 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2873
152c477a
JB		 2874 /* If there are no cooked monitor interfaces, just free the SKB */
2875 if (!local->cooked_mntrs)
2876 goto out_free_skb;
2877
293702a3 2878 /* room for the radiotap header based on driver features */
90b9e446 2879 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2880
293702a3
JB		 2881 if (skb_headroom(skb) < needed_headroom &&
2882 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2883 goto out_free_skb;
3d30d949 2884
293702a3 2885 /* prepend radiotap information */
973ef21a
FF		 2886 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2887 false);
3d30d949
MW		 2888
2889 skb_set_mac_header(skb, 0);
2890 skb->ip_summed = CHECKSUM_UNNECESSARY;
2891 skb->pkt_type = PACKET_OTHERHOST;
2892 skb->protocol = htons(ETH_P_802_2);
2893
2894 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2895 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2896 continue;
2897
05c914fe 2898 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2899 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2900 continue;
2901
2902 if (prev_dev) {
2903 skb2 = skb_clone(skb, GFP_ATOMIC);
2904 if (skb2) {
2905 skb2->dev = prev_dev;
5548a8a1 2906 netif_receive_skb(skb2);
3d30d949
MW		 2907 }
2908 }
2909
2910 prev_dev = sdata->dev;
2911 sdata->dev->stats.rx_packets++;
2912 sdata->dev->stats.rx_bytes += skb->len;
2913 }
2914
2915 if (prev_dev) {
2916 skb->dev = prev_dev;
5548a8a1 2917 netif_receive_skb(skb);
554891e6
JB		 2918 return;
2919 }
3d30d949
MW		 2920
2921 out_free_skb:
2922 dev_kfree_skb(skb);
2923}
2924
aa0c8636
CL		 2925static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2926 ieee80211_rx_result res)
2927{
2928 switch (res) {
2929 case RX_DROP_MONITOR:
2930 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2931 if (rx->sta)
2932 rx->sta->rx_dropped++;
2933 /* fall through */
2934 case RX_CONTINUE: {
2935 struct ieee80211_rate *rate = NULL;
2936 struct ieee80211_supported_band *sband;
2937 struct ieee80211_rx_status *status;
2938
2939 status = IEEE80211_SKB_RXCB((rx->skb));
2940
2941 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2942 if (!(status->flag & RX_FLAG_HT) &&
2943 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2944 rate = &sband->bitrates[status->rate_idx];
2945
2946 ieee80211_rx_cooked_monitor(rx, rate);
2947 break;
2948 }
2949 case RX_DROP_UNUSABLE:
2950 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2951 if (rx->sta)
2952 rx->sta->rx_dropped++;
2953 dev_kfree_skb(rx->skb);
2954 break;
2955 case RX_QUEUED:
2956 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2957 break;
2958 }
2959}
571ecf67 2960
f9e124fb
CL		 2961static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2962 struct sk_buff_head *frames)
58905290 2963{
58905290 2964 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2965 struct sk_buff *skb;
8944b79f 2966
e32f85f7
LCC		 2967#define CALL_RXH(rxh) \
2968 do { \
2969 res = rxh(rx); \
2970 if (res != RX_CONTINUE) \
2569a826 2971 goto rxh_next; \
e32f85f7 2972 } while (0);
49461622 2973
f9e124fb 2974 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2975
f9e124fb 2976 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2977 /*
2978 * all the other fields are valid across frames
2979 * that belong to an aMPDU since they are on the
2980 * same TID from the same station
2981 */
2982 rx->skb = skb;
2983
2569a826 2984 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2985 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 2986 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 2987 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 2988 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2989 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2990 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2991#ifdef CONFIG_MAC80211_MESH
aa0c8636 2992 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2993 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2994#endif
2154c81c 2995 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2996 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2997
2998 /* special treatment -- needs the queue */
2999 res = ieee80211_rx_h_ctrl(rx, frames);
3000 if (res != RX_CONTINUE)
3001 goto rxh_next;
3002
2e161f78 3003 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3004 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3005 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3006 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3007 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3008
aa0c8636
CL		 3009 rxh_next:
3010 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3011
49461622 3012#undef CALL_RXH
aa0c8636 3013 }
24a8fdad 3014
f9e124fb 3015 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3016}
3017
4406c376 3018static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3019{
f9e124fb 3020 struct sk_buff_head reorder_release;
aa0c8636
CL		 3021 ieee80211_rx_result res = RX_DROP_MONITOR;
3022
f9e124fb
CL		 3023 __skb_queue_head_init(&reorder_release);
3024
aa0c8636
CL		 3025#define CALL_RXH(rxh) \
3026 do { \
3027 res = rxh(rx); \
3028 if (res != RX_CONTINUE) \
3029 goto rxh_next; \
3030 } while (0);
3031
aa0c8636
CL		 3032 CALL_RXH(ieee80211_rx_h_check)
3033
f9e124fb 3034 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3035
f9e124fb 3036 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3037 return;
49461622 3038
2569a826 3039 rxh_next:
aa0c8636
CL		 3040 ieee80211_rx_handlers_result(rx, res);
3041
3042#undef CALL_RXH
58905290
JB		 3043}
3044
2bff8ebf 3045/*
dd318575
JB		 3046 * This function makes calls into the RX path, therefore
3047 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3048 */
3049void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3050{
f9e124fb 3051 struct sk_buff_head frames;
554891e6
JB		 3052 struct ieee80211_rx_data rx = {
3053 .sta = sta,
3054 .sdata = sta->sdata,
3055 .local = sta->local,
9e26297a
JB		 3056 /* This is OK -- must be QoS data frame */
3057 .security_idx = tid,
3058 .seqno_idx = tid,
fcf8bd3b 3059 .flags = 0,
554891e6 3060 };
2c15a0cf
CL		 3061 struct tid_ampdu_rx *tid_agg_rx;
3062
3063 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3064 if (!tid_agg_rx)
3065 return;
2bff8ebf 3066
f9e124fb
CL		 3067 __skb_queue_head_init(&frames);
3068
2c15a0cf 3069 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3070 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3071 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3072
f9e124fb 3073 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3074}
3075
571ecf67
JB		 3076/* main receive path */
3077
3c2723f5
JB		 3078static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3079 struct ieee80211_hdr *hdr)
23a24def 3080{
20b01f80 3081 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3082 struct sk_buff *skb = rx->skb;
3083 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3084 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3085 int multicast = is_multicast_ether_addr(hdr->addr1);
3086
51fb61e7 3087 switch (sdata->vif.type) {
05c914fe 3088 case NL80211_IFTYPE_STATION:
9bc383de 3089 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3090 return false;
77fdaa12 3091 if (!multicast &&
b203ca39 3092 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3093 if (!(sdata->dev->flags & IFF_PROMISC) ||
3094 sdata->u.mgd.use_4addr)
3c2723f5 3095 return false;
554891e6 3096 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3097 }
3098 break;
05c914fe 3099 case NL80211_IFTYPE_ADHOC:
23a24def 3100 if (!bssid)
3c2723f5 3101 return false;
6329b8d9
FF		 3102 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3103 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3104 return false;
a7767f95 3105 if (ieee80211_is_beacon(hdr->frame_control)) {
3c2723f5 3106 return true;
d48b2968 3107 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3c2723f5 3108 return false;
23a24def 3109 } else if (!multicast &&
b203ca39 3110 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3111 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3112 return false;
554891e6 3113 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3114 } else if (!rx->sta) {
3115 int rate_idx;
5614618e
JB		 3116 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3117 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3118 else
eb9fb5b8 3119 rate_idx = status->rate_idx;
8bf11d8d
JB		 3120 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3121 BIT(rate_idx));
0fb8ca45 3122 }
23a24def 3123 break;
05c914fe 3124 case NL80211_IFTYPE_MESH_POINT:
6032f934 3125 if (!multicast &&
b203ca39 3126 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934 3127 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3128 return false;
6032f934 3129
554891e6 3130 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3131 }
3132 break;
05c914fe
JB		 3133 case NL80211_IFTYPE_AP_VLAN:
3134 case NL80211_IFTYPE_AP:
23a24def 3135 if (!bssid) {
b203ca39 3136 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3137 return false;
f142c6b9 3138 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3139 /*
3140 * Accept public action frames even when the
3141 * BSSID doesn't match, this is used for P2P
3142 * and location updates. Note that mac80211
3143 * itself never looks at these frames.
3144 */
2b9ccd4e
JB		 3145 if (!multicast &&
3146 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3147 return false;
d48b2968 3148 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3149 return true;
d48b2968 3150 if (!ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3151 return false;
554891e6 3152 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3153 }
23a24def 3154 break;
05c914fe 3155 case NL80211_IFTYPE_WDS:
a7767f95 3156 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3157 return false;
b203ca39 3158 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3c2723f5 3159 return false;
23a24def 3160 break;
f142c6b9
JB		 3161 case NL80211_IFTYPE_P2P_DEVICE:
3162 if (!ieee80211_is_public_action(hdr, skb->len) &&
3163 !ieee80211_is_probe_req(hdr->frame_control) &&
3164 !ieee80211_is_probe_resp(hdr->frame_control) &&
3165 !ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3166 return false;
1b737f88
JB		 3167 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3168 !multicast)
f142c6b9
JB		 3169 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3170 break;
2ca27bcf 3171 default:
fb1c1cd6 3172 /* should never get here */
f142c6b9 3173 WARN_ON_ONCE(1);
fb1c1cd6 3174 break;
23a24def
JB		 3175 }
3176
3c2723f5 3177 return true;
23a24def
JB		 3178}
3179
4406c376
JB		 3180/*
3181 * This function returns whether or not the SKB
3182 * was destined for RX processing or not, which,
3183 * if consume is true, is equivalent to whether
3184 * or not the skb was consumed.
3185 */
3186static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3187 struct sk_buff *skb, bool consume)
3188{
3189 struct ieee80211_local *local = rx->local;
3190 struct ieee80211_sub_if_data *sdata = rx->sdata;
3191 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3192 struct ieee80211_hdr *hdr = (void *)skb->data;
4406c376
JB		 3193
3194 rx->skb = skb;
554891e6 3195 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376 3196
40791942 3197 if (!prepare_for_handlers(rx, hdr))
4406c376
JB		 3198 return false;
3199
4406c376
JB		 3200 if (!consume) {
3201 skb = skb_copy(skb, GFP_ATOMIC);
3202 if (!skb) {
3203 if (net_ratelimit())
3204 wiphy_debug(local->hw.wiphy,
b305dae4 3205 "failed to copy skb for %s\n",
4406c376
JB		 3206 sdata->name);
3207 return true;
3208 }
3209
3210 rx->skb = skb;
3211 }
3212
3213 ieee80211_invoke_rx_handlers(rx);
3214 return true;
3215}
3216
571ecf67 3217/*
6368e4b1
RR		 3218 * This is the actual Rx frames handler. as it blongs to Rx path it must
3219 * be called with rcu_read_lock protection.
571ecf67 3220 */
71ebb4aa 3221static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3222 struct sk_buff *skb)
571ecf67
JB		 3223{
3224 struct ieee80211_local *local = hw_to_local(hw);
3225 struct ieee80211_sub_if_data *sdata;
571ecf67 3226 struct ieee80211_hdr *hdr;
e3cf8b3f 3227 __le16 fc;
5cf121c3 3228 struct ieee80211_rx_data rx;
4406c376 3229 struct ieee80211_sub_if_data *prev;
56af3268 3230 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3231 int err = 0;
571ecf67 3232
e3cf8b3f 3233 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3234 memset(&rx, 0, sizeof(rx));
3235 rx.skb = skb;
3236 rx.local = local;
72abd81b 3237
e3cf8b3f 3238 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3239 local->dot11ReceivedFragmentCount++;
571ecf67 3240
4a4f1a58
JB		 3241 if (ieee80211_is_mgmt(fc)) {
3242 /* drop frame if too short for header */
3243 if (skb->len < ieee80211_hdrlen(fc))
3244 err = -ENOBUFS;
3245 else
3246 err = skb_linearize(skb);
3247 } else {
e3cf8b3f 3248 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3249 }
e3cf8b3f
ZY		 3250
3251 if (err) {
3252 dev_kfree_skb(skb);
3253 return;
3254 }
3255
3256 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3257 ieee80211_parse_qos(&rx);
d1c3a37c 3258 ieee80211_verify_alignment(&rx);
38f3714d 3259
d48b2968
JB		 3260 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3261 ieee80211_is_beacon(hdr->frame_control)))
3262 ieee80211_scan_rx(local, skb);
3263
e3cf8b3f 3264 if (ieee80211_is_data(fc)) {
56af3268 3265 prev_sta = NULL;
4406c376 3266
7852e361 3267 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3268 if (!prev_sta) {
3269 prev_sta = sta;
3270 continue;
3271 }
3272
3273 rx.sta = prev_sta;
3274 rx.sdata = prev_sta->sdata;
4406c376 3275 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3276
56af3268 3277 prev_sta = sta;
4406c376 3278 }
56af3268
BG		 3279
3280 if (prev_sta) {
3281 rx.sta = prev_sta;
3282 rx.sdata = prev_sta->sdata;
3283
4406c376 3284 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3285 return;
8e26d5ad 3286 goto out;
56af3268 3287 }
4406c376
JB		 3288 }
3289
4b0dd98e 3290 prev = NULL;
b2e7771e 3291
4b0dd98e
JB		 3292 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3293 if (!ieee80211_sdata_running(sdata))
3294 continue;
340e11f3 3295
4b0dd98e
JB		 3296 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3297 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3298 continue;
340e11f3 3299
4b0dd98e
JB		 3300 /*
3301 * frame is destined for this interface, but if it's
3302 * not also for the previous one we handle that after
3303 * the loop to avoid copying the SKB once too much
3304 */
4bb29f8c 3305
4b0dd98e 3306 if (!prev) {
abe60632 3307 prev = sdata;
4b0dd98e 3308 continue;
340e11f3 3309 }
4bb29f8c 3310
7852e361 3311 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3312 rx.sdata = prev;
3313 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3314
4b0dd98e
JB		 3315 prev = sdata;
3316 }
3317
3318 if (prev) {
7852e361 3319 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3320 rx.sdata = prev;
4406c376 3321
4b0dd98e
JB		 3322 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3323 return;
571ecf67 3324 }
4406c376 3325
8e26d5ad 3326 out:
4406c376 3327 dev_kfree_skb(skb);
571ecf67 3328}
6368e4b1
RR		 3329
3330/*
3331 * This is the receive path handler. It is called by a low level driver when an
3332 * 802.11 MPDU is received from the hardware.
3333 */
103bf9f7 3334void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3335{
3336 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3337 struct ieee80211_rate *rate = NULL;
3338 struct ieee80211_supported_band *sband;
f1d58c25 3339 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3340
d20ef63d
JB		 3341 WARN_ON_ONCE(softirq_count() == 0);
3342
444e3803 3343 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3344 goto drop;
8318d78a
JB		 3345
3346 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3347 if (WARN_ON(!sband))
3348 goto drop;
8318d78a 3349
89c3a8ac
JB		 3350 /*
3351 * If we're suspending, it is possible although not too likely
3352 * that we'd be receiving frames after having already partially
3353 * quiesced the stack. We can't process such frames then since
3354 * that might, for example, cause stations to be added or other
3355 * driver callbacks be invoked.
3356 */
77a980dc
JB		 3357 if (unlikely(local->quiescing || local->suspended))
3358 goto drop;
89c3a8ac 3359
04800ada
AN		 3360 /* We might be during a HW reconfig, prevent Rx for the same reason */
3361 if (unlikely(local->in_reconfig))
3362 goto drop;
3363
ea77f12f
JB		 3364 /*
3365 * The same happens when we're not even started,
3366 * but that's worth a warning.
3367 */
77a980dc
JB		 3368 if (WARN_ON(!local->started))
3369 goto drop;
ea77f12f 3370
fc885189 3371 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3372 /*
fc885189
JB		 3373 * Validate the rate, unless a PLCP error means that
3374 * we probably can't have a valid rate here anyway.
e5d6eb83 3375 */
fc885189
JB		 3376
3377 if (status->flag & RX_FLAG_HT) {
3378 /*
3379 * rate_idx is MCS index, which can be [0-76]
3380 * as documented on:
3381 *
3382 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3383 *
3384 * Anything else would be some sort of driver or
3385 * hardware error. The driver should catch hardware
3386 * errors.
3387 */
444e3803 3388 if (WARN(status->rate_idx > 76,
fc885189
JB		 3389 "Rate marked as an HT rate but passed "
3390 "status->rate_idx is not "
3391 "an MCS index [0-76]: %d (0x%02x)\n",
3392 status->rate_idx,
3393 status->rate_idx))
3394 goto drop;
5614618e
JB		 3395 } else if (status->flag & RX_FLAG_VHT) {
3396 if (WARN_ONCE(status->rate_idx > 9 ||
3397 !status->vht_nss ||
3398 status->vht_nss > 8,
3399 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3400 status->rate_idx, status->vht_nss))
3401 goto drop;
fc885189 3402 } else {
444e3803 3403 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3404 goto drop;
3405 rate = &sband->bitrates[status->rate_idx];
3406 }
0fb8ca45 3407 }
6368e4b1 3408
554891e6
JB		 3409 status->rx_flags = 0;
3410
6368e4b1
RR		 3411 /*
3412 * key references and virtual interfaces are protected using RCU
3413 * and this requires that we are in a read-side RCU section during
3414 * receive processing
3415 */
3416 rcu_read_lock();
3417
3418 /*
3419 * Frames with failed FCS/PLCP checksum are not returned,
3420 * all other frames are returned without radiotap header
3421 * if it was previously present.
3422 * Also, frames with less than 16 bytes are dropped.
3423 */
f1d58c25 3424 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3425 if (!skb) {
3426 rcu_read_unlock();
3427 return;
3428 }
3429
e1e54068
JB		 3430 ieee80211_tpt_led_trig_rx(local,
3431 ((struct ieee80211_hdr *)skb->data)->frame_control,
3432 skb->len);
071d9ac2 3433 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3434
3435 rcu_read_unlock();
77a980dc
JB		 3436
3437 return;
3438 drop:
3439 kfree_skb(skb);
6368e4b1 3440}
103bf9f7 3441EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3442
3443/* This is a version of the rx handler that can be called from hard irq
3444 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3445void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3446{
3447 struct ieee80211_local *local = hw_to_local(hw);
3448
3449 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3450
571ecf67
JB		 3451 skb->pkt_type = IEEE80211_RX_MSG;
3452 skb_queue_tail(&local->skb_queue, skb);
3453 tasklet_schedule(&local->tasklet);
3454}
3455EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)