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mac80211: use put_unaligned_le16 in mesh_plink_frame_tx
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
90b9e446
JB		 43 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
44
b2e7771e
JB		 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
e3cf8b3f 47 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
0624760c 52 return NULL;
b2e7771e
JB		 53 }
54 }
55
90b9e446
JB		 56 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
58
b2e7771e
JB		 59 return skb;
60}
61
1df332e8 62static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
b2e7771e 63{
f1d58c25 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
605f1a5b
JB		 65 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
b2e7771e 68
4c298677
JB		 69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
b2e7771e 72 return 1;
605f1a5b
JB		 73 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
b2e7771e 75 return 1;
87228f57
HH		 76 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 79 return 1;
80 return 0;
81}
82
601ae7f2 83static int
90b9e446
JB		 84ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
601ae7f2
BR		 86{
87 int len;
88
89 /* always present fields */
a144f378 90 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 91
a144f378 92 /* allocate extra bitmaps */
90b9e446
JB		 93 if (status->vendor_radiotap_len)
94 len += 4;
a144f378
JB		 95 if (status->chains)
96 len += 4 * hweight8(status->chains);
90b9e446
JB		 97
98 if (ieee80211_have_rx_timestamp(status)) {
99 len = ALIGN(len, 8);
601ae7f2 100 len += 8;
90b9e446 101 }
7fee5372 102 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 103 len += 1;
601ae7f2 104
a144f378
JB		 105 /* antenna field, if we don't have per-chain info */
106 if (!status->chains)
107 len += 1;
108
90b9e446
JB		 109 /* padding for RX_FLAGS if necessary */
110 len = ALIGN(len, 2);
601ae7f2 111
6d744bac
JB		 112 if (status->flag & RX_FLAG_HT) /* HT info */
113 len += 3;
114
4c298677 115 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 116 len = ALIGN(len, 4);
4c298677
JB		 117 len += 8;
118 }
119
51648921
JB		 120 if (status->flag & RX_FLAG_VHT) {
121 len = ALIGN(len, 2);
122 len += 12;
123 }
124
a144f378
JB		 125 if (status->chains) {
126 /* antenna and antenna signal fields */
127 len += 2 * hweight8(status->chains);
128 }
129
90b9e446
JB		 130 if (status->vendor_radiotap_len) {
131 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
132 status->vendor_radiotap_align = 1;
133 /* align standard part of vendor namespace */
134 len = ALIGN(len, 2);
135 /* allocate standard part of vendor namespace */
136 len += 6;
137 /* align vendor-defined part */
138 len = ALIGN(len, status->vendor_radiotap_align);
139 /* vendor-defined part is already in skb */
140 }
141
601ae7f2
BR		 142 return len;
143}
144
00ea6deb 145/*
601ae7f2
BR		 146 * ieee80211_add_rx_radiotap_header - add radiotap header
147 *
148 * add a radiotap header containing all the fields which the hardware provided.
149 */
150static void
151ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
152 struct sk_buff *skb,
601ae7f2 153 struct ieee80211_rate *rate,
973ef21a 154 int rtap_len, bool has_fcs)
601ae7f2 155{
f1d58c25 156 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 157 struct ieee80211_radiotap_header *rthdr;
158 unsigned char *pos;
a144f378
JB		 159 __le32 *it_present;
160 u32 it_present_val;
6a86b9c7 161 u16 rx_flags = 0;
a5e70697 162 u16 channel_flags = 0;
a144f378
JB		 163 int mpdulen, chain;
164 unsigned long chains = status->chains;
f4bda337
TP		 165
166 mpdulen = skb->len;
167 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
168 mpdulen += FCS_LEN;
601ae7f2
BR		 169
170 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
171 memset(rthdr, 0, rtap_len);
a144f378 172 it_present = &rthdr->it_present;
601ae7f2
BR		 173
174 /* radiotap header, set always present flags */
90b9e446 175 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
a144f378
JB		 176 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
177 BIT(IEEE80211_RADIOTAP_CHANNEL) |
178 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
179
180 if (!status->chains)
181 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
182
183 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
184 it_present_val |=
185 BIT(IEEE80211_RADIOTAP_EXT) |
186 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
187 put_unaligned_le32(it_present_val, it_present);
188 it_present++;
189 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
190 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
191 }
601ae7f2 192
90b9e446 193 if (status->vendor_radiotap_len) {
a144f378
JB		 194 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
195 BIT(IEEE80211_RADIOTAP_EXT);
196 put_unaligned_le32(it_present_val, it_present);
197 it_present++;
198 it_present_val = status->vendor_radiotap_bitmap;
90b9e446
JB		 199 }
200
a144f378
JB		 201 put_unaligned_le32(it_present_val, it_present);
202
203 pos = (void *)(it_present + 1);
204
601ae7f2
BR		 205 /* the order of the following fields is important */
206
207 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 208 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 209 /* padding */
210 while ((pos - (u8 *)rthdr) & 7)
211 *pos++ = 0;
f4bda337
TP		 212 put_unaligned_le64(
213 ieee80211_calculate_rx_timestamp(local, status,
214 mpdulen, 0),
215 pos);
1df332e8 216 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 217 pos += 8;
218 }
219
220 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 221 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 222 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 223 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
224 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 225 if (status->flag & RX_FLAG_SHORTPRE)
226 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 227 pos++;
228
229 /* IEEE80211_RADIOTAP_RATE */
5614618e 230 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 231 /*
f8d1ccf1 232 * Without rate information don't add it. If we have,
38f37be2 233 * MCS information is a separate field in radiotap,
73b48099
JB		 234 * added below. The byte here is needed as padding
235 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 236 */
237 *pos = 0;
8d6f658e 238 } else {
2103dec1 239 int shift = 0;
ebe6c7ba 240 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 241 if (status->flag & RX_FLAG_10MHZ)
242 shift = 1;
243 else if (status->flag & RX_FLAG_5MHZ)
244 shift = 2;
245 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 246 }
601ae7f2
BR		 247 pos++;
248
249 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 250 put_unaligned_le16(status->freq, pos);
601ae7f2 251 pos += 2;
a5e70697
SW		 252 if (status->flag & RX_FLAG_10MHZ)
253 channel_flags |= IEEE80211_CHAN_HALF;
254 else if (status->flag & RX_FLAG_5MHZ)
255 channel_flags |= IEEE80211_CHAN_QUARTER;
256
601ae7f2 257 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 258 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 259 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 260 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 261 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 262 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 263 else if (rate)
a5e70697 264 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 265 else
a5e70697
SW		 266 channel_flags |= IEEE80211_CHAN_2GHZ;
267 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 268 pos += 2;
269
270 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 271 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
272 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 273 *pos = status->signal;
274 rthdr->it_present |=
275 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
276 pos++;
277 }
278
601ae7f2
BR		 279 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
280
a144f378
JB		 281 if (!status->chains) {
282 /* IEEE80211_RADIOTAP_ANTENNA */
283 *pos = status->antenna;
284 pos++;
285 }
601ae7f2 286
601ae7f2
BR		 287 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
288
289 /* IEEE80211_RADIOTAP_RX_FLAGS */
290 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 291 if ((pos - (u8 *)rthdr) & 1)
90b9e446 292 *pos++ = 0;
aae89831 293 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 294 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
295 put_unaligned_le16(rx_flags, pos);
601ae7f2 296 pos += 2;
6d744bac
JB		 297
298 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 299 unsigned int stbc;
300
6d744bac 301 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 302 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 303 *pos = 0;
304 if (status->flag & RX_FLAG_SHORT_GI)
305 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
306 if (status->flag & RX_FLAG_40MHZ)
307 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 308 if (status->flag & RX_FLAG_HT_GF)
309 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
786677d1
OR		 310 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
311 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 312 pos++;
313 *pos++ = status->rate_idx;
314 }
4c298677
JB		 315
316 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
317 u16 flags = 0;
318
319 /* ensure 4 byte alignment */
320 while ((pos - (u8 *)rthdr) & 3)
321 pos++;
322 rthdr->it_present |=
323 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
324 put_unaligned_le32(status->ampdu_reference, pos);
325 pos += 4;
326 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
327 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
328 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
329 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
330 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
331 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
332 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
333 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
334 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
335 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
336 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
337 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
338 put_unaligned_le16(flags, pos);
339 pos += 2;
340 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
341 *pos++ = status->ampdu_delimiter_crc;
342 else
343 *pos++ = 0;
344 *pos++ = 0;
345 }
90b9e446 346
51648921
JB		 347 if (status->flag & RX_FLAG_VHT) {
348 u16 known = local->hw.radiotap_vht_details;
349
350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
351 /* known field - how to handle 80+80? */
352 if (status->flag & RX_FLAG_80P80MHZ)
353 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
354 put_unaligned_le16(known, pos);
355 pos += 2;
356 /* flags */
357 if (status->flag & RX_FLAG_SHORT_GI)
358 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
359 pos++;
360 /* bandwidth */
361 if (status->flag & RX_FLAG_80MHZ)
362 *pos++ = 4;
363 else if (status->flag & RX_FLAG_80P80MHZ)
364 *pos++ = 0; /* marked not known above */
365 else if (status->flag & RX_FLAG_160MHZ)
366 *pos++ = 11;
367 else if (status->flag & RX_FLAG_40MHZ)
368 *pos++ = 1;
369 else /* 20 MHz */
370 *pos++ = 0;
371 /* MCS/NSS */
372 *pos = (status->rate_idx << 4) | status->vht_nss;
373 pos += 4;
374 /* coding field */
375 pos++;
376 /* group ID */
377 pos++;
378 /* partial_aid */
379 pos += 2;
380 }
381
a144f378
JB		 382 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
383 *pos++ = status->chain_signal[chain];
384 *pos++ = chain;
385 }
386
90b9e446
JB		 387 if (status->vendor_radiotap_len) {
388 /* ensure 2 byte alignment for the vendor field as required */
389 if ((pos - (u8 *)rthdr) & 1)
390 *pos++ = 0;
391 *pos++ = status->vendor_radiotap_oui[0];
392 *pos++ = status->vendor_radiotap_oui[1];
393 *pos++ = status->vendor_radiotap_oui[2];
394 *pos++ = status->vendor_radiotap_subns;
395 put_unaligned_le16(status->vendor_radiotap_len, pos);
396 pos += 2;
397 /* align the actual payload as requested */
398 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
399 *pos++ = 0;
400 }
601ae7f2
BR		 401}
402
b2e7771e
JB		 403/*
404 * This function copies a received frame to all monitor interfaces and
405 * returns a cleaned-up SKB that no longer includes the FCS nor the
406 * radiotap header the driver might have added.
407 */
408static struct sk_buff *
409ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 410 struct ieee80211_rate *rate)
b2e7771e 411{
f1d58c25 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 413 struct ieee80211_sub_if_data *sdata;
293702a3 414 int needed_headroom;
b2e7771e
JB		 415 struct sk_buff *skb, *skb2;
416 struct net_device *prev_dev = NULL;
417 int present_fcs_len = 0;
b2e7771e
JB		 418
419 /*
420 * First, we may need to make a copy of the skb because
421 * (1) we need to modify it for radiotap (if not present), and
422 * (2) the other RX handlers will modify the skb we got.
423 *
424 * We don't need to, of course, if we aren't going to return
425 * the SKB because it has a bad FCS/PLCP checksum.
426 */
0869aea0 427
b2e7771e
JB		 428 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
429 present_fcs_len = FCS_LEN;
430
605f1a5b
JB		 431 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 433 dev_kfree_skb(origskb);
434 return NULL;
435 }
436
b2e7771e 437 if (!local->monitors) {
0869aea0 438 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 439 dev_kfree_skb(origskb);
440 return NULL;
441 }
442
0869aea0 443 return remove_monitor_info(local, origskb);
b2e7771e
JB		 444 }
445
751413ea
HS		 446 /* room for the radiotap header based on driver features */
447 needed_headroom = ieee80211_rx_radiotap_space(local, status);
448
0869aea0 449 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 450 /* only need to expand headroom if necessary */
451 skb = origskb;
452 origskb = NULL;
453
454 /*
455 * This shouldn't trigger often because most devices have an
456 * RX header they pull before we get here, and that should
457 * be big enough for our radiotap information. We should
458 * probably export the length to drivers so that we can have
459 * them allocate enough headroom to start with.
460 */
461 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 462 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 463 dev_kfree_skb(skb);
464 return NULL;
465 }
466 } else {
467 /*
468 * Need to make a copy and possibly remove radiotap header
469 * and FCS from the original.
470 */
471 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
472
0869aea0 473 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 474
475 if (!skb)
476 return origskb;
477 }
478
0869aea0 479 /* prepend radiotap information */
973ef21a
FF		 480 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
481 true);
b2e7771e 482
ce3edf6d 483 skb_reset_mac_header(skb);
b2e7771e
JB		 484 skb->ip_summed = CHECKSUM_UNNECESSARY;
485 skb->pkt_type = PACKET_OTHERHOST;
486 skb->protocol = htons(ETH_P_802_2);
487
488 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 489 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 490 continue;
491
3d30d949
MW		 492 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
493 continue;
494
9607e6b6 495 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 496 continue;
497
b2e7771e
JB		 498 if (prev_dev) {
499 skb2 = skb_clone(skb, GFP_ATOMIC);
500 if (skb2) {
501 skb2->dev = prev_dev;
5548a8a1 502 netif_receive_skb(skb2);
b2e7771e
JB		 503 }
504 }
505
506 prev_dev = sdata->dev;
507 sdata->dev->stats.rx_packets++;
508 sdata->dev->stats.rx_bytes += skb->len;
509 }
510
511 if (prev_dev) {
512 skb->dev = prev_dev;
5548a8a1 513 netif_receive_skb(skb);
b2e7771e
JB		 514 } else
515 dev_kfree_skb(skb);
516
517 return origskb;
518}
519
5cf121c3 520static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 521{
238f74a2 522 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 523 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 524 int tid, seqno_idx, security_idx;
6e0d114d
JB		 525
526 /* does the frame have a qos control field? */
238f74a2
HH		 527 if (ieee80211_is_data_qos(hdr->frame_control)) {
528 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 529 /* frame has qos control */
238f74a2 530 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 531 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 532 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 533
534 seqno_idx = tid;
535 security_idx = tid;
6e0d114d 536 } else {
1411f9b5
JB		 537 /*
538 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
539 *
540 * Sequence numbers for management frames, QoS data
541 * frames with a broadcast/multicast address in the
542 * Address 1 field, and all non-QoS data frames sent
543 * by QoS STAs are assigned using an additional single
544 * modulo-4096 counter, [...]
545 *
546 * We also use that counter for non-QoS STAs.
547 */
5a306f58 548 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 549 security_idx = 0;
550 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 551 security_idx = IEEE80211_NUM_TIDS;
9e26297a 552 tid = 0;
6e0d114d 553 }
52865dfd 554
9e26297a
JB		 555 rx->seqno_idx = seqno_idx;
556 rx->security_idx = security_idx;
6e0d114d
JB		 557 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558 * For now, set skb->priority to 0 for other cases. */
559 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 560}
6e0d114d 561
d1c3a37c
JB		 562/**
563 * DOC: Packet alignment
564 *
565 * Drivers always need to pass packets that are aligned to two-byte boundaries
566 * to the stack.
567 *
568 * Additionally, should, if possible, align the payload data in a way that
569 * guarantees that the contained IP header is aligned to a four-byte
570 * boundary. In the case of regular frames, this simply means aligning the
571 * payload to a four-byte boundary (because either the IP header is directly
572 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 573 * in front of it). If the payload data is not properly aligned and the
574 * architecture doesn't support efficient unaligned operations, mac80211
575 * will align the data.
d1c3a37c
JB		 576 *
577 * With A-MSDU frames, however, the payload data address must yield two modulo
578 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579 * push the IP header further back to a multiple of four again. Thankfully, the
580 * specs were sane enough this time around to require padding each A-MSDU
581 * subframe to a length that is a multiple of four.
582 *
25985edc 583 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 584 * the payload is not supported, the driver is required to move the 802.11
585 * header to be directly in front of the payload in that case.
586 */
587static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 588{
59d9cb07
KV		 589#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590 WARN_ONCE((unsigned long)rx->skb->data & 1,
591 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 592#endif
6e0d114d
JB		 593}
594
6368e4b1 595
571ecf67
JB		 596/* rx handlers */
597
3cfcf6ac
JM		 598static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
599{
600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
601
602 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
603 return 0;
604
605 return ieee80211_is_robust_mgmt_frame(hdr);
606}
607
608
609static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
610{
611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
612
613 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
614 return 0;
615
616 return ieee80211_is_robust_mgmt_frame(hdr);
617}
618
619
620/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
622{
623 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
624 struct ieee80211_mmie *mmie;
625
1df332e8 626 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 627 return -1;
628
629 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
630 return -1; /* not a robust management frame */
631
632 mmie = (struct ieee80211_mmie *)
633 (skb->data + skb->len - sizeof(*mmie));
634 if (mmie->element_id != WLAN_EID_MMIE ||
635 mmie->length != sizeof(*mmie) - 2)
636 return -1;
637
638 return le16_to_cpu(mmie->key_id);
639}
640
2475b1cc
MS		 641static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
642 struct sk_buff *skb)
643{
644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
645 __le16 fc;
646 int hdrlen;
647 u8 keyid;
648
649 fc = hdr->frame_control;
650 hdrlen = ieee80211_hdrlen(fc);
651
652 if (skb->len < hdrlen + cs->hdr_len)
653 return -EINVAL;
654
655 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
656 keyid &= cs->key_idx_mask;
657 keyid >>= cs->key_idx_shift;
658
659 return keyid;
660}
661
1df332e8 662static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 663{
a7767f95 664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 665 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 666
a7767f95 667 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 668 if (is_multicast_ether_addr(hdr->addr1)) {
669 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 670 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 671 return RX_DROP_MONITOR;
b203ca39 672 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 673 return RX_DROP_MONITOR;
674 } else {
675 if (!ieee80211_has_a4(hdr->frame_control))
676 return RX_DROP_MONITOR;
b203ca39 677 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 678 return RX_DROP_MONITOR;
679 }
33b64eb2
LCC		 680 }
681
682 /* If there is not an established peer link and this is not a peer link
683 * establisment frame, beacon or probe, drop the frame.
684 */
685
57cf8043 686 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 687 struct ieee80211_mgmt *mgmt;
d6d1a5a7 688
a7767f95 689 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 690 return RX_DROP_MONITOR;
691
a7767f95 692 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 693 u8 category;
9b395bc3
JB		 694
695 /* make sure category field is present */
696 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
697 return RX_DROP_MONITOR;
698
33b64eb2 699 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 700 category = mgmt->u.action.category;
701 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 702 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 703 return RX_DROP_MONITOR;
33b64eb2 704 return RX_CONTINUE;
33b64eb2
LCC		 705 }
706
a7767f95
HH		 707 if (ieee80211_is_probe_req(hdr->frame_control) ||
708 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 709 ieee80211_is_beacon(hdr->frame_control) ||
710 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 711 return RX_CONTINUE;
712
713 return RX_DROP_MONITOR;
a7767f95
HH		 714 }
715
902acc78
JB		 716 return RX_CONTINUE;
717}
33b64eb2 718
d3b2fb53 719static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 720 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 721 int index,
722 struct sk_buff_head *frames)
1edfb1af 723{
1edfb1af 724 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 725 struct ieee80211_rx_status *status;
1edfb1af 726
dd318575
JB		 727 lockdep_assert_held(&tid_agg_rx->reorder_lock);
728
1edfb1af
JB		 729 if (!skb)
730 goto no_frame;
731
071d9ac2 732 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 733 tid_agg_rx->stored_mpdu_num--;
734 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 735 status = IEEE80211_SKB_RXCB(skb);
736 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
f9e124fb 737 __skb_queue_tail(frames, skb);
1edfb1af
JB		 738
739no_frame:
9a886586 740 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 741}
742
d3b2fb53 743static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 744 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 745 u16 head_seq_num,
746 struct sk_buff_head *frames)
1edfb1af
JB		 747{
748 int index;
749
dd318575
JB		 750 lockdep_assert_held(&tid_agg_rx->reorder_lock);
751
9a886586 752 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 753 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 754 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
755 frames);
1edfb1af
JB		 756 }
757}
758
759/*
760 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
761 * the skb was added to the buffer longer than this time ago, the earlier
762 * frames that have not yet been received are assumed to be lost and the skb
763 * can be released for processing. This may also release other skb's from the
764 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 765 *
766 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 767 */
768#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
769
d3b2fb53 770static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 771 struct tid_ampdu_rx *tid_agg_rx,
772 struct sk_buff_head *frames)
aa0c8636 773{
2bff8ebf 774 int index, j;
aa0c8636 775
dd318575
JB		 776 lockdep_assert_held(&tid_agg_rx->reorder_lock);
777
aa0c8636 778 /* release the buffer until next missing frame */
2e3049b7 779 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 780 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 781 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 782 /*
783 * No buffers ready to be released, but check whether any
784 * frames in the reorder buffer have timed out.
785 */
aa0c8636
CL		 786 int skipped = 1;
787 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
788 j = (j + 1) % tid_agg_rx->buf_size) {
789 if (!tid_agg_rx->reorder_buf[j]) {
790 skipped++;
791 continue;
792 }
499fe9a4
DH		 793 if (skipped &&
794 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 795 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 796 goto set_release_timer;
aa0c8636 797
bdcbd8e0
JB		 798 ht_dbg_ratelimited(sdata,
799 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 800 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
801 frames);
aa0c8636
CL		 802
803 /*
804 * Increment the head seq# also for the skipped slots.
805 */
806 tid_agg_rx->head_seq_num =
9a886586
JB		 807 (tid_agg_rx->head_seq_num +
808 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 809 skipped = 0;
810 }
811 } else while (tid_agg_rx->reorder_buf[index]) {
f9e124fb
CL		 812 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
813 frames);
2e3049b7 814 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 815 }
2bff8ebf
CL		 816
817 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 818 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 819
820 for (; j != (index - 1) % tid_agg_rx->buf_size;
821 j = (j + 1) % tid_agg_rx->buf_size) {
822 if (tid_agg_rx->reorder_buf[j])
823 break;
824 }
825
826 set_release_timer:
827
828 mod_timer(&tid_agg_rx->reorder_timer,
334df731 829 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 830 HT_RX_REORDER_BUF_TIMEOUT);
831 } else {
832 del_timer(&tid_agg_rx->reorder_timer);
833 }
aa0c8636
CL		 834}
835
1edfb1af
JB		 836/*
837 * As this function belongs to the RX path it must be under
838 * rcu_read_lock protection. It returns false if the frame
839 * can be processed immediately, true if it was consumed.
840 */
d3b2fb53 841static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 842 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 843 struct sk_buff *skb,
844 struct sk_buff_head *frames)
1edfb1af
JB		 845{
846 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
847 u16 sc = le16_to_cpu(hdr->seq_ctrl);
848 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
849 u16 head_seq_num, buf_size;
850 int index;
2bff8ebf 851 bool ret = true;
1edfb1af 852
dd318575
JB		 853 spin_lock(&tid_agg_rx->reorder_lock);
854
1edfb1af
JB		 855 buf_size = tid_agg_rx->buf_size;
856 head_seq_num = tid_agg_rx->head_seq_num;
857
858 /* frame with out of date sequence number */
9a886586 859 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 860 dev_kfree_skb(skb);
2bff8ebf 861 goto out;
1edfb1af
JB		 862 }
863
864 /*
865 * If frame the sequence number exceeds our buffering window
866 * size release some previous frames to make room for this one.
867 */
9a886586
JB		 868 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
869 head_seq_num = ieee80211_sn_inc(
870 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 871 /* release stored frames up to new head to stack */
d3b2fb53 872 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 873 head_seq_num, frames);
1edfb1af
JB		 874 }
875
876 /* Now the new frame is always in the range of the reordering buffer */
877
2e3049b7 878 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 879
880 /* check if we already stored this frame */
881 if (tid_agg_rx->reorder_buf[index]) {
882 dev_kfree_skb(skb);
2bff8ebf 883 goto out;
1edfb1af
JB		 884 }
885
886 /*
887 * If the current MPDU is in the right order and nothing else
888 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 889 * If it is first but there's something stored, we may be able
890 * to release frames after this one.
1edfb1af
JB		 891 */
892 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
893 tid_agg_rx->stored_mpdu_num == 0) {
9a886586
JB		 894 tid_agg_rx->head_seq_num =
895 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 896 ret = false;
897 goto out;
1edfb1af
JB		 898 }
899
900 /* put the frame in the reordering buffer */
901 tid_agg_rx->reorder_buf[index] = skb;
902 tid_agg_rx->reorder_time[index] = jiffies;
903 tid_agg_rx->stored_mpdu_num++;
f9e124fb 904 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1edfb1af 905
2bff8ebf
CL		 906 out:
907 spin_unlock(&tid_agg_rx->reorder_lock);
908 return ret;
1edfb1af
JB		 909}
910
911/*
912 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
913 * true if the MPDU was buffered, false if it should be processed.
914 */
f9e124fb
CL		 915static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
916 struct sk_buff_head *frames)
1edfb1af 917{
2569a826
JB		 918 struct sk_buff *skb = rx->skb;
919 struct ieee80211_local *local = rx->local;
1edfb1af 920 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 922 struct sta_info *sta = rx->sta;
1edfb1af
JB		 923 struct tid_ampdu_rx *tid_agg_rx;
924 u16 sc;
6cc00d54 925 u8 tid, ack_policy;
1edfb1af
JB		 926
927 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 928 goto dont_reorder;
1edfb1af
JB		 929
930 /*
931 * filter the QoS data rx stream according to
932 * STA/TID and check if this STA/TID is on aggregation
933 */
934
1edfb1af 935 if (!sta)
2569a826 936 goto dont_reorder;
1edfb1af 937
6cc00d54
TP		 938 ack_policy = *ieee80211_get_qos_ctl(hdr) &
939 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 940 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
941
a87f736d
JB		 942 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
943 if (!tid_agg_rx)
944 goto dont_reorder;
1edfb1af
JB		 945
946 /* qos null data frames are excluded */
947 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 948 goto dont_reorder;
1edfb1af 949
6cc00d54
TP		 950 /* not part of a BA session */
951 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
952 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
953 goto dont_reorder;
954
660c6a44
TP		 955 /* not actually part of this BA session */
956 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
957 goto dont_reorder;
958
1edfb1af
JB		 959 /* new, potentially un-ordered, ampdu frame - process it */
960
961 /* reset session timer */
962 if (tid_agg_rx->timeout)
12d3952f 963 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 964
965 /* if this mpdu is fragmented - terminate rx aggregation session */
966 sc = le16_to_cpu(hdr->seq_ctrl);
967 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 968 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 969 skb_queue_tail(&rx->sdata->skb_queue, skb);
970 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 971 return;
1edfb1af
JB		 972 }
973
a87f736d
JB		 974 /*
975 * No locking needed -- we will only ever process one
976 * RX packet at a time, and thus own tid_agg_rx. All
977 * other code manipulating it needs to (and does) make
978 * sure that we cannot get to it any more before doing
979 * anything with it.
980 */
f9e124fb
CL		 981 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
982 frames))
2569a826
JB		 983 return;
984
985 dont_reorder:
f9e124fb 986 __skb_queue_tail(frames, skb);
1edfb1af 987}
33b64eb2 988
49461622 989static ieee80211_rx_result debug_noinline
5cf121c3 990ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 991{
a7767f95 992 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 993 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 994
6b0f3274
JB		 995 /*
996 * Drop duplicate 802.11 retransmissions
997 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
998 */
999 if (rx->skb->len >= 24 && rx->sta &&
1000 !ieee80211_is_ctl(hdr->frame_control) &&
1001 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1002 !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 1003 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 1004 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 1005 hdr->seq_ctrl)) {
554891e6 1006 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 1007 rx->local->dot11FrameDuplicateCount++;
1008 rx->sta->num_duplicates++;
1009 }
b1f93314 1010 return RX_DROP_UNUSABLE;
0cfcefef 1011 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
9e26297a 1012 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
0cfcefef 1013 }
571ecf67
JB		 1014 }
1015
571ecf67
JB		 1016 if (unlikely(rx->skb->len < 16)) {
1017 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 1018 return RX_DROP_MONITOR;
571ecf67
JB		 1019 }
1020
571ecf67
JB		 1021 /* Drop disallowed frame classes based on STA auth/assoc state;
1022 * IEEE 802.11, Chap 5.5.
1023 *
ccd7b362
JB		 1024 * mac80211 filters only based on association state, i.e. it drops
1025 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1026 * deauth/disassoc frames when needed. In addition, hostapd is
1027 * responsible for filtering on both auth and assoc states.
1028 */
33b64eb2 1029
902acc78 1030 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1031 return ieee80211_rx_mesh_check(rx);
33b64eb2 1032
a7767f95
HH		 1033 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1034 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1035 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1036 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 1037 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1038 /*
1039 * accept port control frames from the AP even when it's not
1040 * yet marked ASSOC to prevent a race where we don't set the
1041 * assoc bit quickly enough before it sends the first frame
1042 */
1043 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1044 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1045 unsigned int hdrlen;
1046 __be16 ethertype;
1047
1048 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1049
1050 if (rx->skb->len < hdrlen + 8)
1051 return RX_DROP_MONITOR;
1052
1053 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1054 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1055 return RX_CONTINUE;
1056 }
21fc7560
JB		 1057
1058 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1059 cfg80211_rx_spurious_frame(rx->sdata->dev,
1060 hdr->addr2,
1061 GFP_ATOMIC))
1062 return RX_DROP_UNUSABLE;
1063
e4c26add 1064 return RX_DROP_MONITOR;
2a33bee2 1065 }
571ecf67 1066
9ae54c84 1067 return RX_CONTINUE;
570bd537
JB		 1068}
1069
1070
572e0012
KV		 1071static ieee80211_rx_result debug_noinline
1072ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1073{
1074 struct ieee80211_local *local;
1075 struct ieee80211_hdr *hdr;
1076 struct sk_buff *skb;
1077
1078 local = rx->local;
1079 skb = rx->skb;
1080 hdr = (struct ieee80211_hdr *) skb->data;
1081
1082 if (!local->pspolling)
1083 return RX_CONTINUE;
1084
1085 if (!ieee80211_has_fromds(hdr->frame_control))
1086 /* this is not from AP */
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_is_data(hdr->frame_control))
1090 return RX_CONTINUE;
1091
1092 if (!ieee80211_has_moredata(hdr->frame_control)) {
1093 /* AP has no more frames buffered for us */
1094 local->pspolling = false;
1095 return RX_CONTINUE;
1096 }
1097
1098 /* more data bit is set, let's request a new frame from the AP */
1099 ieee80211_send_pspoll(local, rx->sdata);
1100
1101 return RX_CONTINUE;
1102}
1103
d012a605 1104static void sta_ps_start(struct sta_info *sta)
571ecf67 1105{
133b8226 1106 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1107 struct ieee80211_local *local = sdata->local;
d012a605 1108 struct ps_data *ps;
0795af57 1109
d012a605
MP		 1110 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1111 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1112 ps = &sdata->bss->ps;
1113 else
1114 return;
1115
1116 atomic_inc(&ps->num_sta_ps);
c2c98fde 1117 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1118 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1119 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1120 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1121 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1122}
1123
d012a605 1124static void sta_ps_end(struct sta_info *sta)
571ecf67 1125{
bdcbd8e0
JB		 1126 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1127 sta->sta.addr, sta->sta.aid);
004c872e 1128
c2c98fde 1129 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1130 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1131 sta->sta.addr, sta->sta.aid);
af818581
JB		 1132 return;
1133 }
1134
1135 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1136}
1137
d057e5a3
AN		 1138int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1139{
1140 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1141 bool in_ps;
1142
1143 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1144
1145 /* Don't let the same PS state be set twice */
c2c98fde 1146 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1147 if ((start && in_ps) || (!start && !in_ps))
1148 return -EINVAL;
1149
1150 if (start)
d012a605 1151 sta_ps_start(sta_inf);
d057e5a3 1152 else
d012a605 1153 sta_ps_end(sta_inf);
d057e5a3
AN		 1154
1155 return 0;
1156}
1157EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1158
47086fc5
JB		 1159static ieee80211_rx_result debug_noinline
1160ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1161{
1162 struct ieee80211_sub_if_data *sdata = rx->sdata;
1163 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1165 int tid, ac;
1166
1167 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1168 return RX_CONTINUE;
1169
1170 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1171 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1172 return RX_CONTINUE;
1173
1174 /*
1175 * The device handles station powersave, so don't do anything about
1176 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1177 * it to mac80211 since they're handled.)
1178 */
1179 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1180 return RX_CONTINUE;
1181
1182 /*
1183 * Don't do anything if the station isn't already asleep. In
1184 * the uAPSD case, the station will probably be marked asleep,
1185 * in the PS-Poll case the station must be confused ...
1186 */
c2c98fde 1187 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1188 return RX_CONTINUE;
1189
1190 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1191 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1192 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1193 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1194 else
c2c98fde 1195 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1196 }
47086fc5
JB		 1197
1198 /* Free PS Poll skb here instead of returning RX_DROP that would
1199 * count as an dropped frame. */
1200 dev_kfree_skb(rx->skb);
1201
1202 return RX_QUEUED;
1203 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1204 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1205 ieee80211_has_pm(hdr->frame_control) &&
1206 (ieee80211_is_data_qos(hdr->frame_control) ||
1207 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1208 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1209 ac = ieee802_1d_to_ac[tid & 7];
1210
1211 /*
1212 * If this AC is not trigger-enabled do nothing.
1213 *
1214 * NB: This could/should check a separate bitmap of trigger-
1215 * enabled queues, but for now we only implement uAPSD w/o
1216 * TSPEC changes to the ACs, so they're always the same.
1217 */
1218 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1219 return RX_CONTINUE;
1220
1221 /* if we are in a service period, do nothing */
c2c98fde 1222 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1223 return RX_CONTINUE;
1224
c2c98fde 1225 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1226 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1227 else
c2c98fde 1228 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1229 }
1230
1231 return RX_CONTINUE;
1232}
1233
49461622 1234static ieee80211_rx_result debug_noinline
5cf121c3 1235ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1236{
1237 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1238 struct sk_buff *skb = rx->skb;
1239 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1241 int i;
571ecf67
JB		 1242
1243 if (!sta)
9ae54c84 1244 return RX_CONTINUE;
571ecf67 1245
b291ba11
JB		 1246 /*
1247 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1248 * BSSID and for station already AUTHORIZED to avoid keeping the
1249 * current IBSS network alive in cases where other STAs start
1250 * using different BSSID. This will also give the station another
1251 * chance to restart the authentication/authorization in case
1252 * something went wrong the first time.
b291ba11 1253 */
05c914fe 1254 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1255 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1256 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1257 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1258 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1259 sta->last_rx = jiffies;
3af6334c
FF		 1260 if (ieee80211_is_data(hdr->frame_control)) {
1261 sta->last_rx_rate_idx = status->rate_idx;
1262 sta->last_rx_rate_flag = status->flag;
5614618e 1263 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1264 }
1265 }
b291ba11
JB		 1266 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1267 /*
33b64eb2
LCC		 1268 * Mesh beacons will update last_rx when if they are found to
1269 * match the current local configuration when processed.
571ecf67 1270 */
b291ba11 1271 sta->last_rx = jiffies;
3af6334c
FF		 1272 if (ieee80211_is_data(hdr->frame_control)) {
1273 sta->last_rx_rate_idx = status->rate_idx;
1274 sta->last_rx_rate_flag = status->flag;
5614618e 1275 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1276 }
571ecf67
JB		 1277 }
1278
554891e6 1279 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1280 return RX_CONTINUE;
571ecf67 1281
3cf335d5
KV		 1282 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1283 ieee80211_sta_rx_notify(rx->sdata, hdr);
1284
571ecf67
JB		 1285 sta->rx_fragments++;
1286 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1287 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1288 sta->last_signal = status->signal;
1289 ewma_add(&sta->avg_signal, -status->signal);
1290 }
571ecf67 1291
ef0621e8
FF		 1292 if (status->chains) {
1293 sta->chains = status->chains;
1294 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1295 int signal = status->chain_signal[i];
1296
1297 if (!(status->chains & BIT(i)))
1298 continue;
1299
1300 sta->chain_signal_last[i] = signal;
1301 ewma_add(&sta->chain_signal_avg[i], -signal);
1302 }
1303 }
1304
72eaa43a
JB		 1305 /*
1306 * Change STA power saving mode only at the end of a frame
1307 * exchange sequence.
1308 */
d057e5a3
AN		 1309 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1310 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1311 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1312 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1313 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1314 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1315 /*
1316 * Ignore doze->wake transitions that are
1317 * indicated by non-data frames, the standard
1318 * is unclear here, but for example going to
1319 * PS mode and then scanning would cause a
1320 * doze->wake transition for the probe request,
1321 * and that is clearly undesirable.
1322 */
1323 if (ieee80211_is_data(hdr->frame_control) &&
1324 !ieee80211_has_pm(hdr->frame_control))
d012a605 1325 sta_ps_end(sta);
72eaa43a
JB		 1326 } else {
1327 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1328 sta_ps_start(sta);
72eaa43a 1329 }
571ecf67
JB		 1330 }
1331
3f52b7e3
MP		 1332 /* mesh power save support */
1333 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1334 ieee80211_mps_rx_h_sta_process(sta, hdr);
1335
22403def
JB		 1336 /*
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1339 */
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1343
1344 /*
1345 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
d524215f
FF		 1349 */
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1357 GFP_ATOMIC);
d524215f 1358 return RX_DROP_MONITOR;
e7f4a940 1359 }
22403def
JB		 1360 /*
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1363 */
571ecf67
JB		 1364 sta->rx_packets++;
1365 dev_kfree_skb(rx->skb);
9ae54c84 1366 return RX_QUEUED;
571ecf67
JB		 1367 }
1368
9ae54c84 1369 return RX_CONTINUE;
571ecf67
JB		 1370} /* ieee80211_rx_h_sta_process */
1371
86c228a7
JA		 1372static ieee80211_rx_result debug_noinline
1373ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1374{
1375 struct sk_buff *skb = rx->skb;
1376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1377 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1378 int keyidx;
1379 int hdrlen;
1380 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1381 struct ieee80211_key *sta_ptk = NULL;
1382 int mmie_keyidx = -1;
1383 __le16 fc;
2475b1cc 1384 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1385
1386 /*
1387 * Key selection 101
1388 *
1389 * There are four types of keys:
1390 * - GTK (group keys)
1391 * - IGTK (group keys for management frames)
1392 * - PTK (pairwise keys)
1393 * - STK (station-to-station pairwise keys)
1394 *
1395 * When selecting a key, we have to distinguish between multicast
1396 * (including broadcast) and unicast frames, the latter can only
1397 * use PTKs and STKs while the former always use GTKs and IGTKs.
1398 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1399 * unicast frames can also use key indices like GTKs. Hence, if we
1400 * don't have a PTK/STK we check the key index for a WEP key.
1401 *
1402 * Note that in a regular BSS, multicast frames are sent by the
1403 * AP only, associated stations unicast the frame to the AP first
1404 * which then multicasts it on their behalf.
1405 *
1406 * There is also a slight problem in IBSS mode: GTKs are negotiated
1407 * with each station, that is something we don't currently handle.
1408 * The spec seems to expect that one negotiates the same key with
1409 * every station but there's no such requirement; VLANs could be
1410 * possible.
1411 */
1412
1413 /*
1414 * No point in finding a key and decrypting if the frame is neither
1415 * addressed to us nor a multicast frame.
1416 */
1417 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1418 return RX_CONTINUE;
1419
1420 /* start without a key */
1421 rx->key = NULL;
2475b1cc 1422 fc = hdr->frame_control;
86c228a7 1423
2475b1cc
MS		 1424 if (rx->sta) {
1425 int keyid = rx->sta->ptk_idx;
86c228a7 1426
2475b1cc
MS		 1427 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1428 cs = rx->sta->cipher_scheme;
1429 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1430 if (unlikely(keyid < 0))
1431 return RX_DROP_UNUSABLE;
1432 }
1433 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1434 }
86c228a7
JA		 1435
1436 if (!ieee80211_has_protected(fc))
1437 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1438
1439 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1440 rx->key = sta_ptk;
1441 if ((status->flag & RX_FLAG_DECRYPTED) &&
1442 (status->flag & RX_FLAG_IV_STRIPPED))
1443 return RX_CONTINUE;
1444 /* Skip decryption if the frame is not protected. */
1445 if (!ieee80211_has_protected(fc))
1446 return RX_CONTINUE;
1447 } else if (mmie_keyidx >= 0) {
1448 /* Broadcast/multicast robust management frame / BIP */
1449 if ((status->flag & RX_FLAG_DECRYPTED) &&
1450 (status->flag & RX_FLAG_IV_STRIPPED))
1451 return RX_CONTINUE;
1452
1453 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1454 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1455 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1456 if (rx->sta)
1457 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1458 if (!rx->key)
1459 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1460 } else if (!ieee80211_has_protected(fc)) {
1461 /*
1462 * The frame was not protected, so skip decryption. However, we
1463 * need to set rx->key if there is a key that could have been
1464 * used so that the frame may be dropped if encryption would
1465 * have been expected.
1466 */
1467 struct ieee80211_key *key = NULL;
1468 struct ieee80211_sub_if_data *sdata = rx->sdata;
1469 int i;
1470
1471 if (ieee80211_is_mgmt(fc) &&
1472 is_multicast_ether_addr(hdr->addr1) &&
1473 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1474 rx->key = key;
1475 else {
1476 if (rx->sta) {
1477 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1478 key = rcu_dereference(rx->sta->gtk[i]);
1479 if (key)
1480 break;
1481 }
1482 }
1483 if (!key) {
1484 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1485 key = rcu_dereference(sdata->keys[i]);
1486 if (key)
1487 break;
1488 }
1489 }
1490 if (key)
1491 rx->key = key;
1492 }
1493 return RX_CONTINUE;
1494 } else {
1495 u8 keyid;
2475b1cc 1496
86c228a7
JA		 1497 /*
1498 * The device doesn't give us the IV so we won't be
1499 * able to look up the key. That's ok though, we
1500 * don't need to decrypt the frame, we just won't
1501 * be able to keep statistics accurate.
1502 * Except for key threshold notifications, should
1503 * we somehow allow the driver to tell us which key
1504 * the hardware used if this flag is set?
1505 */
1506 if ((status->flag & RX_FLAG_DECRYPTED) &&
1507 (status->flag & RX_FLAG_IV_STRIPPED))
1508 return RX_CONTINUE;
1509
1510 hdrlen = ieee80211_hdrlen(fc);
1511
2475b1cc
MS		 1512 if (cs) {
1513 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1514
2475b1cc
MS		 1515 if (unlikely(keyidx < 0))
1516 return RX_DROP_UNUSABLE;
1517 } else {
1518 if (rx->skb->len < 8 + hdrlen)
1519 return RX_DROP_UNUSABLE; /* TODO: count this? */
1520 /*
1521 * no need to call ieee80211_wep_get_keyidx,
1522 * it verifies a bunch of things we've done already
1523 */
1524 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1525 keyidx = keyid >> 6;
1526 }
86c228a7
JA		 1527
1528 /* check per-station GTK first, if multicast packet */
1529 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1530 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1531
1532 /* if not found, try default key */
1533 if (!rx->key) {
1534 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1535
1536 /*
1537 * RSNA-protected unicast frames should always be
1538 * sent with pairwise or station-to-station keys,
1539 * but for WEP we allow using a key index as well.
1540 */
1541 if (rx->key &&
1542 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1543 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1544 !is_multicast_ether_addr(hdr->addr1))
1545 rx->key = NULL;
1546 }
1547 }
1548
1549 if (rx->key) {
1550 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1551 return RX_DROP_MONITOR;
1552
1553 rx->key->tx_rx_count++;
1554 /* TODO: add threshold stuff again */
1555 } else {
1556 return RX_DROP_MONITOR;
1557 }
1558
1559 switch (rx->key->conf.cipher) {
1560 case WLAN_CIPHER_SUITE_WEP40:
1561 case WLAN_CIPHER_SUITE_WEP104:
1562 result = ieee80211_crypto_wep_decrypt(rx);
1563 break;
1564 case WLAN_CIPHER_SUITE_TKIP:
1565 result = ieee80211_crypto_tkip_decrypt(rx);
1566 break;
1567 case WLAN_CIPHER_SUITE_CCMP:
1568 result = ieee80211_crypto_ccmp_decrypt(rx);
1569 break;
1570 case WLAN_CIPHER_SUITE_AES_CMAC:
1571 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1572 break;
1573 default:
2475b1cc 1574 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1575 }
1576
1577 /* the hdr variable is invalid after the decrypt handlers */
1578
1579 /* either the frame has been decrypted or will be dropped */
1580 status->flag |= RX_FLAG_DECRYPTED;
1581
1582 return result;
1583}
1584
571ecf67
JB		 1585static inline struct ieee80211_fragment_entry *
1586ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1587 unsigned int frag, unsigned int seq, int rx_queue,
1588 struct sk_buff **skb)
1589{
1590 struct ieee80211_fragment_entry *entry;
571ecf67 1591
571ecf67
JB		 1592 entry = &sdata->fragments[sdata->fragment_next++];
1593 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1594 sdata->fragment_next = 0;
1595
bdcbd8e0 1596 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1597 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1598
1599 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1600 *skb = NULL;
1601 entry->first_frag_time = jiffies;
1602 entry->seq = seq;
1603 entry->rx_queue = rx_queue;
1604 entry->last_frag = frag;
1605 entry->ccmp = 0;
1606 entry->extra_len = 0;
1607
1608 return entry;
1609}
1610
1611static inline struct ieee80211_fragment_entry *
1612ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1613 unsigned int frag, unsigned int seq,
571ecf67
JB		 1614 int rx_queue, struct ieee80211_hdr *hdr)
1615{
1616 struct ieee80211_fragment_entry *entry;
1617 int i, idx;
1618
1619 idx = sdata->fragment_next;
1620 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1621 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1622
1623 idx--;
1624 if (idx < 0)
1625 idx = IEEE80211_FRAGMENT_MAX - 1;
1626
1627 entry = &sdata->fragments[idx];
1628 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1629 entry->rx_queue != rx_queue ||
1630 entry->last_frag + 1 != frag)
1631 continue;
1632
b73d70ad 1633 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1634
b73d70ad
HH		 1635 /*
1636 * Check ftype and addresses are equal, else check next fragment
1637 */
1638 if (((hdr->frame_control ^ f_hdr->frame_control) &
1639 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1640 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1641 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1642 continue;
1643
ab46623e 1644 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1645 __skb_queue_purge(&entry->skb_list);
1646 continue;
1647 }
1648 return entry;
1649 }
1650
1651 return NULL;
1652}
1653
49461622 1654static ieee80211_rx_result debug_noinline
5cf121c3 1655ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1656{
1657 struct ieee80211_hdr *hdr;
1658 u16 sc;
358c8d9d 1659 __le16 fc;
571ecf67
JB		 1660 unsigned int frag, seq;
1661 struct ieee80211_fragment_entry *entry;
1662 struct sk_buff *skb;
554891e6 1663 struct ieee80211_rx_status *status;
571ecf67 1664
b73d70ad 1665 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1666 fc = hdr->frame_control;
f7fbf70e
JC		 1667
1668 if (ieee80211_is_ctl(fc))
1669 return RX_CONTINUE;
1670
571ecf67
JB		 1671 sc = le16_to_cpu(hdr->seq_ctrl);
1672 frag = sc & IEEE80211_SCTL_FRAG;
1673
358c8d9d 1674 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1675 is_multicast_ether_addr(hdr->addr1))) {
1676 /* not fragmented */
1677 goto out;
1678 }
1679 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1680
e3cf8b3f
ZY		 1681 if (skb_linearize(rx->skb))
1682 return RX_DROP_UNUSABLE;
1683
058897a4
AK		 1684 /*
1685 * skb_linearize() might change the skb->data and
1686 * previously cached variables (in this case, hdr) need to
1687 * be refreshed with the new data.
1688 */
1689 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1690 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1691
1692 if (frag == 0) {
1693 /* This is the first fragment of a new frame. */
1694 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1695 rx->seqno_idx, &(rx->skb));
97359d12 1696 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1697 ieee80211_has_protected(fc)) {
9e26297a 1698 int queue = rx->security_idx;
571ecf67
JB		 1699 /* Store CCMP PN so that we can verify that the next
1700 * fragment has a sequential PN value. */
1701 entry->ccmp = 1;
1702 memcpy(entry->last_pn,
9190252c 1703 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1704 IEEE80211_CCMP_PN_LEN);
571ecf67 1705 }
9ae54c84 1706 return RX_QUEUED;
571ecf67
JB		 1707 }
1708
1709 /* This is a fragment for a frame that should already be pending in
1710 * fragment cache. Add this fragment to the end of the pending entry.
1711 */
9e26297a
JB		 1712 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1713 rx->seqno_idx, hdr);
571ecf67
JB		 1714 if (!entry) {
1715 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1716 return RX_DROP_MONITOR;
571ecf67
JB		 1717 }
1718
1719 /* Verify that MPDUs within one MSDU have sequential PN values.
1720 * (IEEE 802.11i, 8.3.3.4.5) */
1721 if (entry->ccmp) {
1722 int i;
4325f6ca 1723 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1724 int queue;
97359d12 1725 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1726 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1727 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1728 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1729 pn[i]++;
1730 if (pn[i])
1731 break;
1732 }
9e26297a 1733 queue = rx->security_idx;
9190252c 1734 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1735 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1736 return RX_DROP_UNUSABLE;
4325f6ca 1737 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1738 }
1739
358c8d9d 1740 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1741 __skb_queue_tail(&entry->skb_list, rx->skb);
1742 entry->last_frag = frag;
1743 entry->extra_len += rx->skb->len;
358c8d9d 1744 if (ieee80211_has_morefrags(fc)) {
571ecf67 1745 rx->skb = NULL;
9ae54c84 1746 return RX_QUEUED;
571ecf67
JB		 1747 }
1748
1749 rx->skb = __skb_dequeue(&entry->skb_list);
1750 if (skb_tailroom(rx->skb) < entry->extra_len) {
1751 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1752 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1753 GFP_ATOMIC))) {
1754 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1755 __skb_queue_purge(&entry->skb_list);
e4c26add 1756 return RX_DROP_UNUSABLE;
571ecf67
JB		 1757 }
1758 }
1759 while ((skb = __skb_dequeue(&entry->skb_list))) {
1760 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1761 dev_kfree_skb(skb);
1762 }
1763
1764 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1765 status = IEEE80211_SKB_RXCB(rx->skb);
1766 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1767
1768 out:
1769 if (rx->sta)
1770 rx->sta->rx_packets++;
1771 if (is_multicast_ether_addr(hdr->addr1))
1772 rx->local->dot11MulticastReceivedFrameCount++;
1773 else
1774 ieee80211_led_rx(rx->local);
9ae54c84 1775 return RX_CONTINUE;
571ecf67
JB		 1776}
1777
1df332e8 1778static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1779{
1df332e8 1780 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1781 return -EACCES;
571ecf67 1782
76ee65bf 1783 return 0;
571ecf67
JB		 1784}
1785
1df332e8 1786static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1787{
eb9fb5b8
JB		 1788 struct sk_buff *skb = rx->skb;
1789 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1790
3017b80b 1791 /*
7848ba7d
JB		 1792 * Pass through unencrypted frames if the hardware has
1793 * decrypted them already.
3017b80b 1794 */
eb9fb5b8 1795 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1796 return 0;
571ecf67
JB		 1797
1798 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1799 if (unlikely(!ieee80211_has_protected(fc) &&
1800 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1801 ieee80211_is_data(fc) &&
b3fc9c6c 1802 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1803 return -EACCES;
bef5d1c7
JB		 1804
1805 return 0;
1806}
1807
1df332e8 1808static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1809{
1810 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1811 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1812 __le16 fc = hdr->frame_control;
bef5d1c7 1813
e3efca0a
JM		 1814 /*
1815 * Pass through unencrypted frames if the hardware has
1816 * decrypted them already.
1817 */
1818 if (status->flag & RX_FLAG_DECRYPTED)
1819 return 0;
bef5d1c7 1820
c2c98fde 1821 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1822 if (unlikely(!ieee80211_has_protected(fc) &&
1823 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1824 rx->key)) {
6ff57cf8
JB		 1825 if (ieee80211_is_deauth(fc) ||
1826 ieee80211_is_disassoc(fc))
1827 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1828 rx->skb->data,
1829 rx->skb->len);
f2ca3ea4 1830 return -EACCES;
cf4e594e 1831 }
f2ca3ea4 1832 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1833 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1834 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1835 if (ieee80211_is_deauth(fc) ||
1836 ieee80211_is_disassoc(fc))
1837 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1838 rx->skb->data,
1839 rx->skb->len);
f2ca3ea4 1840 return -EACCES;
cf4e594e 1841 }
f2ca3ea4
JM		 1842 /*
1843 * When using MFP, Action frames are not allowed prior to
1844 * having configured keys.
1845 */
1846 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1847 ieee80211_is_robust_mgmt_frame(
1848 (struct ieee80211_hdr *) rx->skb->data)))
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
1965 if (skb) {
d1c3a37c
JB		 1966 int align __maybe_unused;
1967
59d9cb07 1968#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1969 /*
1970 * 'align' will only take the values 0 or 2 here
1971 * since all frames are required to be aligned
1972 * to 2-byte boundaries when being passed to
191922cd
JB		 1973 * mac80211; the code here works just as well if
1974 * that isn't true, but mac80211 assumes it can
1975 * access fields as 2-byte aligned (e.g. for
1976 * compare_ether_addr)
d1c3a37c 1977 */
dacb6f1d 1978 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1979 if (align) {
1980 if (WARN_ON(skb_headroom(skb) < 3)) {
1981 dev_kfree_skb(skb);
1982 skb = NULL;
1983 } else {
1984 u8 *data = skb->data;
8ce0b589
ZY		 1985 size_t len = skb_headlen(skb);
1986 skb->data -= align;
1987 memmove(skb->data, data, len);
1988 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1989 }
1990 }
1991#endif
1992
1993 if (skb) {
1994 /* deliver to local stack */
1995 skb->protocol = eth_type_trans(skb, dev);
1996 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1997 netif_receive_skb(skb);
d1c3a37c 1998 }
571ecf67
JB		 1999 }
2000
76ee65bf 2001 if (xmit_skb) {
aef6c928
HS		 2002 /*
2003 * Send to wireless media and increase priority by 256 to
2004 * keep the received priority instead of reclassifying
2005 * the frame (see cfg80211_classify8021d).
2006 */
2007 xmit_skb->priority += 256;
f831e909 2008 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2009 skb_reset_network_header(xmit_skb);
2010 skb_reset_mac_header(xmit_skb);
76ee65bf 2011 dev_queue_xmit(xmit_skb);
571ecf67 2012 }
76ee65bf
RR		 2013}
2014
49461622 2015static ieee80211_rx_result debug_noinline
5cf121c3 2016ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2017{
eb9fb5b8 2018 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2019 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2020 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2021 __le16 fc = hdr->frame_control;
eaf85ca7 2022 struct sk_buff_head frame_list;
554891e6 2023 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2024
358c8d9d 2025 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2026 return RX_CONTINUE;
fd4c7f2f 2027
358c8d9d 2028 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2029 return RX_DROP_MONITOR;
fd4c7f2f 2030
554891e6 2031 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2032 return RX_CONTINUE;
fd4c7f2f 2033
eaf85ca7
ZY		 2034 if (ieee80211_has_a4(hdr->frame_control) &&
2035 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2036 !rx->sdata->u.vlan.sta)
e4c26add 2037 return RX_DROP_UNUSABLE;
fd4c7f2f 2038
eaf85ca7
ZY		 2039 if (is_multicast_ether_addr(hdr->addr1) &&
2040 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2041 rx->sdata->u.vlan.sta) ||
2042 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2043 rx->sdata->u.mgd.use_4addr)))
e4c26add 2044 return RX_DROP_UNUSABLE;
fd4c7f2f 2045
eaf85ca7
ZY		 2046 skb->dev = dev;
2047 __skb_queue_head_init(&frame_list);
fd4c7f2f 2048
e3cf8b3f
ZY		 2049 if (skb_linearize(skb))
2050 return RX_DROP_UNUSABLE;
2051
eaf85ca7
ZY		 2052 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2053 rx->sdata->vif.type,
8b3becad 2054 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2055
eaf85ca7
ZY		 2056 while (!skb_queue_empty(&frame_list)) {
2057 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2058
358c8d9d 2059 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2060 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2061 continue;
2062 }
eaf85ca7
ZY		 2063 dev->stats.rx_packets++;
2064 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2065
2066 ieee80211_deliver_skb(rx);
2067 }
2068
9ae54c84 2069 return RX_QUEUED;
fd4c7f2f
RR		 2070}
2071
bf94e17b 2072#ifdef CONFIG_MAC80211_MESH
b0dee578 2073static ieee80211_rx_result
e32f85f7
LCC		 2074ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2075{
30789eb6
TP		 2076 struct ieee80211_hdr *fwd_hdr, *hdr;
2077 struct ieee80211_tx_info *info;
e32f85f7 2078 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2079 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2080 struct ieee80211_local *local = rx->local;
eb9fb5b8 2081 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2082 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2083 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 2084 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 2085 u16 q, hdrlen;
e32f85f7
LCC		 2086
2087 hdr = (struct ieee80211_hdr *) skb->data;
2088 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2089
2090 /* make sure fixed part of mesh header is there, also checks skb len */
2091 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2092 return RX_DROP_MONITOR;
2093
2094 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2095
2096 /* make sure full mesh header is there, also checks skb len */
2097 if (!pskb_may_pull(rx->skb,
2098 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2099 return RX_DROP_MONITOR;
2100
2101 /* reload pointers */
2102 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2103 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2104
2157fdd6
TP		 2105 /* frame is in RMC, don't forward */
2106 if (ieee80211_is_data(hdr->frame_control) &&
2107 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2108 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2109 return RX_DROP_MONITOR;
2110
555cb715
JC		 2111 if (!ieee80211_is_data(hdr->frame_control) ||
2112 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2113 return RX_CONTINUE;
2114
2115 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2116 return RX_DROP_MONITOR;
2117
43b7b314 2118 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2119 struct mesh_path *mppath;
43b7b314
JC		 2120 char *proxied_addr;
2121 char *mpp_addr;
2122
2123 if (is_multicast_ether_addr(hdr->addr1)) {
2124 mpp_addr = hdr->addr3;
2125 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2126 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2127 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2128 mpp_addr = hdr->addr4;
2129 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2130 } else {
2131 return RX_DROP_MONITOR;
43b7b314 2132 }
79617dee 2133
79617dee 2134 rcu_read_lock();
bf7cd94d 2135 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2136 if (!mppath) {
bf7cd94d 2137 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2138 } else {
2139 spin_lock_bh(&mppath->state_lock);
b203ca39 2140 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2141 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2142 spin_unlock_bh(&mppath->state_lock);
2143 }
2144 rcu_read_unlock();
2145 }
2146
3c5772a5
JC		 2147 /* Frame has reached destination. Don't forward */
2148 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2149 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2150 return RX_CONTINUE;
2151
00e96dec 2152 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2153 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2154 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2155 return RX_DROP_MONITOR;
2156 }
2157 skb_set_queue_mapping(skb, q);
e32f85f7 2158
30789eb6
TP		 2159 if (!--mesh_hdr->ttl) {
2160 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2161 goto out;
30789eb6
TP		 2162 }
2163
d665508b
CYY		 2164 if (!ifmsh->mshcfg.dot11MeshForwarding)
2165 goto out;
2166
30789eb6
TP		 2167 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2168 if (!fwd_skb) {
bdcbd8e0 2169 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2170 sdata->name);
30789eb6
TP		 2171 goto out;
2172 }
2173
2174 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2175 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2176 info = IEEE80211_SKB_CB(fwd_skb);
2177 memset(info, 0, sizeof(*info));
2178 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2179 info->control.vif = &rx->sdata->vif;
2180 info->control.jiffies = jiffies;
2181 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2182 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2183 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2184 /* update power mode indication when forwarding */
2185 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2186 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2187 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2188 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2189 } else {
2190 /* unable to resolve next hop */
bf7cd94d
JB		 2191 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2192 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
30789eb6 2193 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2194 kfree_skb(fwd_skb);
30789eb6 2195 return RX_DROP_MONITOR;
e32f85f7
LCC		 2196 }
2197
30789eb6
TP		 2198 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2199 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2200 out:
3c5772a5 2201 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2202 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2203 return RX_CONTINUE;
2204 else
2205 return RX_DROP_MONITOR;
2206}
bf94e17b 2207#endif
e32f85f7 2208
49461622 2209static ieee80211_rx_result debug_noinline
5cf121c3 2210ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2211{
eb9fb5b8 2212 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2213 struct ieee80211_local *local = rx->local;
eb9fb5b8 2214 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2216 __le16 fc = hdr->frame_control;
4114fa21 2217 bool port_control;
ce3edf6d 2218 int err;
76ee65bf 2219
358c8d9d 2220 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2221 return RX_CONTINUE;
76ee65bf 2222
358c8d9d 2223 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2224 return RX_DROP_MONITOR;
76ee65bf 2225
f14543ee 2226 /*
e7f4a940
JB		 2227 * Send unexpected-4addr-frame event to hostapd. For older versions,
2228 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2229 */
2230 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2231 sdata->vif.type == NL80211_IFTYPE_AP) {
2232 if (rx->sta &&
2233 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2234 cfg80211_rx_unexpected_4addr_frame(
2235 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2236 return RX_DROP_MONITOR;
e7f4a940 2237 }
f14543ee 2238
4114fa21 2239 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2240 if (unlikely(err))
e4c26add 2241 return RX_DROP_UNUSABLE;
76ee65bf 2242
358c8d9d 2243 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2244 return RX_DROP_MONITOR;
ce3edf6d 2245
4114fa21
FF		 2246 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2247 unlikely(port_control) && sdata->bss) {
2248 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2249 u.ap);
2250 dev = sdata->dev;
2251 rx->sdata = sdata;
2252 }
2253
76ee65bf
RR		 2254 rx->skb->dev = dev;
2255
2256 dev->stats.rx_packets++;
2257 dev->stats.rx_bytes += rx->skb->len;
2258
08ca944e 2259 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2260 !is_multicast_ether_addr(
2261 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2262 (!local->scanning &&
2263 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2264 mod_timer(&local->dynamic_ps_timer, jiffies +
2265 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2266 }
2267
76ee65bf 2268 ieee80211_deliver_skb(rx);
571ecf67 2269
9ae54c84 2270 return RX_QUEUED;
571ecf67
JB		 2271}
2272
49461622 2273static ieee80211_rx_result debug_noinline
f9e124fb 2274ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2275{
71364716 2276 struct sk_buff *skb = rx->skb;
a7767f95 2277 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2278 struct tid_ampdu_rx *tid_agg_rx;
2279 u16 start_seq_num;
2280 u16 tid;
2281
a7767f95 2282 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2283 return RX_CONTINUE;
71364716 2284
a7767f95 2285 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2286 struct {
2287 __le16 control, start_seq_num;
2288 } __packed bar_data;
2289
71364716 2290 if (!rx->sta)
a02ae758 2291 return RX_DROP_MONITOR;
8ae5977f
JB		 2292
2293 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2294 &bar_data, sizeof(bar_data)))
2295 return RX_DROP_MONITOR;
2296
8ae5977f 2297 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2298
2299 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2300 if (!tid_agg_rx)
a02ae758 2301 return RX_DROP_MONITOR;
71364716 2302
8ae5977f 2303 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2304
2305 /* reset session timer */
20ad19d0
JB		 2306 if (tid_agg_rx->timeout)
2307 mod_timer(&tid_agg_rx->session_timer,
2308 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2309
dd318575 2310 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2311 /* release stored frames up to start of BAR */
d3b2fb53 2312 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2313 start_seq_num, frames);
dd318575
JB		 2314 spin_unlock(&tid_agg_rx->reorder_lock);
2315
a02ae758
JB		 2316 kfree_skb(skb);
2317 return RX_QUEUED;
71364716
RR		 2318 }
2319
08daecae
JB		 2320 /*
2321 * After this point, we only want management frames,
2322 * so we can drop all remaining control frames to
2323 * cooked monitor interfaces.
2324 */
2325 return RX_DROP_MONITOR;
71364716
RR		 2326}
2327
f4f727a6
JM		 2328static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2329 struct ieee80211_mgmt *mgmt,
2330 size_t len)
fea14732
JM		 2331{
2332 struct ieee80211_local *local = sdata->local;
2333 struct sk_buff *skb;
2334 struct ieee80211_mgmt *resp;
2335
b203ca39 2336 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2337 /* Not to own unicast address */
2338 return;
2339 }
2340
b203ca39
JP		 2341 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2342 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2343 /* Not from the current AP or not associated yet. */
fea14732
JM		 2344 return;
2345 }
2346
2347 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2348 /* Too short SA Query request frame */
2349 return;
2350 }
2351
2352 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2353 if (skb == NULL)
2354 return;
2355
2356 skb_reserve(skb, local->hw.extra_tx_headroom);
2357 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2358 memset(resp, 0, 24);
2359 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2360 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2361 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2362 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2363 IEEE80211_STYPE_ACTION);
2364 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2365 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2366 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2367 memcpy(resp->u.action.u.sa_query.trans_id,
2368 mgmt->u.action.u.sa_query.trans_id,
2369 WLAN_SA_QUERY_TR_ID_LEN);
2370
62ae67be 2371 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2372}
2373
2e161f78
JB		 2374static ieee80211_rx_result debug_noinline
2375ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2376{
2377 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2379
2380 /*
2381 * From here on, look only at management frames.
2382 * Data and control frames are already handled,
2383 * and unknown (reserved) frames are useless.
2384 */
2385 if (rx->skb->len < 24)
2386 return RX_DROP_MONITOR;
2387
2388 if (!ieee80211_is_mgmt(mgmt->frame_control))
2389 return RX_DROP_MONITOR;
2390
ee971924
JB		 2391 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2392 ieee80211_is_beacon(mgmt->frame_control) &&
2393 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2394 int sig = 0;
2395
2396 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2397 sig = status->signal;
2398
ee971924
JB		 2399 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2400 rx->skb->data, rx->skb->len,
37c73b5f 2401 status->freq, sig);
ee971924
JB		 2402 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2403 }
2404
554891e6 2405 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2406 return RX_DROP_MONITOR;
2407
2408 if (ieee80211_drop_unencrypted_mgmt(rx))
2409 return RX_DROP_UNUSABLE;
2410
2411 return RX_CONTINUE;
2412}
2413
de1ede7a
JB		 2414static ieee80211_rx_result debug_noinline
2415ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2416{
2417 struct ieee80211_local *local = rx->local;
eb9fb5b8 2418 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2419 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2421 int len = rx->skb->len;
2422
2423 if (!ieee80211_is_action(mgmt->frame_control))
2424 return RX_CONTINUE;
2425
026331c4
JM		 2426 /* drop too small frames */
2427 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2428 return RX_DROP_UNUSABLE;
de1ede7a 2429
815b8092 2430 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2431 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2432 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2433 return RX_DROP_UNUSABLE;
de1ede7a 2434
554891e6 2435 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2436 return RX_DROP_UNUSABLE;
97ebe12a 2437
de1ede7a 2438 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2439 case WLAN_CATEGORY_HT:
2440 /* reject HT action frames from stations not supporting HT */
2441 if (!rx->sta->sta.ht_cap.ht_supported)
2442 goto invalid;
2443
2444 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2445 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2446 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2447 sdata->vif.type != NL80211_IFTYPE_AP &&
2448 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2449 break;
2450
ec61cd63 2451 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2452 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2453 goto invalid;
2454
2455 switch (mgmt->u.action.u.ht_smps.action) {
2456 case WLAN_HT_ACTION_SMPS: {
2457 struct ieee80211_supported_band *sband;
af0ed69b 2458 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2459
2460 /* convert to HT capability */
2461 switch (mgmt->u.action.u.ht_smps.smps_control) {
2462 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2463 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2464 break;
2465 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2466 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2467 break;
2468 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2469 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2470 break;
2471 default:
2472 goto invalid;
2473 }
1d8d3dec
JB		 2474
2475 /* if no change do nothing */
af0ed69b 2476 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2477 goto handled;
af0ed69b 2478 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2479
2480 sband = rx->local->hw.wiphy->bands[status->band];
2481
64f68e5d
JB		 2482 rate_control_rate_update(local, sband, rx->sta,
2483 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2484 goto handled;
2485 }
ec61cd63
JB		 2486 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2487 struct ieee80211_supported_band *sband;
2488 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2489 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2490
2491 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2492 if (!(rx->sta->sta.ht_cap.cap &
2493 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2494 goto handled;
2495
e1a0c6b3
JB		 2496 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2497 new_bw = IEEE80211_STA_RX_BW_20;
2498 else
2499 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2500
e1a0c6b3 2501 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2502 goto handled;
2503
ec61cd63
JB		 2504 sband = rx->local->hw.wiphy->bands[status->band];
2505
2506 rate_control_rate_update(local, sband, rx->sta,
2507 IEEE80211_RC_BW_CHANGED);
2508 goto handled;
2509 }
1d8d3dec
JB		 2510 default:
2511 goto invalid;
2512 }
2513
0af83d3d 2514 break;
1b3a2e49
JB		 2515 case WLAN_CATEGORY_PUBLIC:
2516 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2517 goto invalid;
2518 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2519 break;
2520 if (!rx->sta)
2521 break;
2522 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2523 break;
2524 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2525 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2526 break;
2527 if (len < offsetof(struct ieee80211_mgmt,
2528 u.action.u.ext_chan_switch.variable))
2529 goto invalid;
2530 goto queue;
0af83d3d
JB		 2531 case WLAN_CATEGORY_VHT:
2532 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2533 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2534 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2535 sdata->vif.type != NL80211_IFTYPE_AP &&
2536 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2537 break;
2538
2539 /* verify action code is present */
2540 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2541 goto invalid;
2542
2543 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2544 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2545 u8 opmode;
2546
2547 /* verify opmode is present */
2548 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2549 goto invalid;
2550
2551 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2552
2553 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2554 opmode, status->band,
2555 false);
0af83d3d
JB		 2556 goto handled;
2557 }
2558 default:
2559 break;
2560 }
1d8d3dec 2561 break;
de1ede7a 2562 case WLAN_CATEGORY_BACK:
8abd3f9b 2563 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2564 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2565 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2566 sdata->vif.type != NL80211_IFTYPE_AP &&
2567 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2568 break;
8abd3f9b 2569
026331c4
JM		 2570 /* verify action_code is present */
2571 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2572 break;
2573
de1ede7a
JB		 2574 switch (mgmt->u.action.u.addba_req.action_code) {
2575 case WLAN_ACTION_ADDBA_REQ:
2576 if (len < (IEEE80211_MIN_ACTION_SIZE +
2577 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2578 goto invalid;
2579 break;
de1ede7a
JB		 2580 case WLAN_ACTION_ADDBA_RESP:
2581 if (len < (IEEE80211_MIN_ACTION_SIZE +
2582 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2583 goto invalid;
2584 break;
de1ede7a
JB		 2585 case WLAN_ACTION_DELBA:
2586 if (len < (IEEE80211_MIN_ACTION_SIZE +
2587 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2588 goto invalid;
2589 break;
2590 default:
2591 goto invalid;
de1ede7a 2592 }
bed7ee6e 2593
8b58ff83 2594 goto queue;
39192c0b 2595 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2596 /* verify action_code is present */
2597 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2598 break;
2599
39192c0b
JB		 2600 switch (mgmt->u.action.u.measurement.action_code) {
2601 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2602 if (status->band != IEEE80211_BAND_5GHZ)
2603 break;
2604
39192c0b
JB		 2605 if (len < (IEEE80211_MIN_ACTION_SIZE +
2606 sizeof(mgmt->u.action.u.measurement)))
84040805 2607 break;
cd7760e6
SW		 2608
2609 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2610 break;
2611
39192c0b 2612 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2613 goto handled;
cd7760e6
SW		 2614 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2615 u8 *bssid;
2616 if (len < (IEEE80211_MIN_ACTION_SIZE +
2617 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2618 break;
cc32abd4 2619
cd7760e6 2620 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2621 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2622 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2623 break;
2624
2625 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2626 bssid = sdata->u.mgd.bssid;
2627 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2628 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2629 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2630 bssid = mgmt->sa;
cd7760e6
SW		 2631 else
2632 break;
2633
2634 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2635 break;
c481ec97 2636
8b58ff83 2637 goto queue;
cd7760e6 2638 }
39192c0b
JB		 2639 }
2640 break;
fea14732
JM		 2641 case WLAN_CATEGORY_SA_QUERY:
2642 if (len < (IEEE80211_MIN_ACTION_SIZE +
2643 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2644 break;
2645
fea14732
JM		 2646 switch (mgmt->u.action.u.sa_query.action) {
2647 case WLAN_ACTION_SA_QUERY_REQUEST:
2648 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2649 break;
fea14732 2650 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2651 goto handled;
fea14732
JM		 2652 }
2653 break;
8db09850 2654 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2655 if (len < (IEEE80211_MIN_ACTION_SIZE +
2656 sizeof(mgmt->u.action.u.self_prot.action_code)))
2657 break;
2658
8db09850
TP		 2659 switch (mgmt->u.action.u.self_prot.action_code) {
2660 case WLAN_SP_MESH_PEERING_OPEN:
2661 case WLAN_SP_MESH_PEERING_CLOSE:
2662 case WLAN_SP_MESH_PEERING_CONFIRM:
2663 if (!ieee80211_vif_is_mesh(&sdata->vif))
2664 goto invalid;
a6dad6a2 2665 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2666 /* userspace handles this frame */
2667 break;
2668 goto queue;
2669 case WLAN_SP_MGK_INFORM:
2670 case WLAN_SP_MGK_ACK:
2671 if (!ieee80211_vif_is_mesh(&sdata->vif))
2672 goto invalid;
2673 break;
2674 }
2675 break;
d3aaec8a 2676 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2677 if (len < (IEEE80211_MIN_ACTION_SIZE +
2678 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2679 break;
2680
77a121c3
JB		 2681 if (!ieee80211_vif_is_mesh(&sdata->vif))
2682 break;
25d49e4d 2683 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2684 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2685 break;
2686 goto queue;
84040805 2687 }
026331c4 2688
2e161f78
JB		 2689 return RX_CONTINUE;
2690
bed7ee6e 2691 invalid:
554891e6 2692 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2693 /* will return in the next handlers */
2694 return RX_CONTINUE;
2695
2696 handled:
2697 if (rx->sta)
2698 rx->sta->rx_packets++;
2699 dev_kfree_skb(rx->skb);
2700 return RX_QUEUED;
2701
2702 queue:
2703 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2704 skb_queue_tail(&sdata->skb_queue, rx->skb);
2705 ieee80211_queue_work(&local->hw, &sdata->work);
2706 if (rx->sta)
2707 rx->sta->rx_packets++;
2708 return RX_QUEUED;
2709}
2710
2711static ieee80211_rx_result debug_noinline
2712ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2713{
554891e6 2714 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2715 int sig = 0;
2e161f78
JB		 2716
2717 /* skip known-bad action frames and return them in the next handler */
554891e6 2718 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2719 return RX_CONTINUE;
d7907448 2720
026331c4
JM		 2721 /*
2722 * Getting here means the kernel doesn't know how to handle
2723 * it, but maybe userspace does ... include returned frames
2724 * so userspace can register for those to know whether ones
2725 * it transmitted were processed or returned.
2726 */
026331c4 2727
804483e9
JB		 2728 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2729 sig = status->signal;
2730
71bbc994 2731 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
19504cf5 2732 rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2e161f78
JB		 2733 if (rx->sta)
2734 rx->sta->rx_packets++;
2735 dev_kfree_skb(rx->skb);
2736 return RX_QUEUED;
2737 }
2738
2e161f78
JB		 2739 return RX_CONTINUE;
2740}
2741
2742static ieee80211_rx_result debug_noinline
2743ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2744{
2745 struct ieee80211_local *local = rx->local;
2746 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2747 struct sk_buff *nskb;
2748 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2750
2751 if (!ieee80211_is_action(mgmt->frame_control))
2752 return RX_CONTINUE;
2753
2754 /*
2755 * For AP mode, hostapd is responsible for handling any action
2756 * frames that we didn't handle, including returning unknown
2757 * ones. For all other modes we will return them to the sender,
2758 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2759 * 802.11-2012 9.24.4.
2e161f78
JB		 2760 * Newer versions of hostapd shall also use the management frame
2761 * registration mechanisms, but older ones still use cooked
2762 * monitor interfaces so push all frames there.
2763 */
554891e6 2764 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2765 (sdata->vif.type == NL80211_IFTYPE_AP ||
2766 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2767 return RX_DROP_MONITOR;
026331c4 2768
4b5ebccc
JB		 2769 if (is_multicast_ether_addr(mgmt->da))
2770 return RX_DROP_MONITOR;
2771
84040805
JB		 2772 /* do not return rejected action frames */
2773 if (mgmt->u.action.category & 0x80)
2774 return RX_DROP_UNUSABLE;
2775
2776 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2777 GFP_ATOMIC);
2778 if (nskb) {
292b4df6 2779 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2780
292b4df6
JL		 2781 nmgmt->u.action.category |= 0x80;
2782 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2783 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2784
2785 memset(nskb->cb, 0, sizeof(nskb->cb));
2786
07e5a5f5
JB		 2787 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2788 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2789
2790 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2791 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2792 IEEE80211_TX_CTL_NO_CCK_RATE;
2793 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2794 info->hw_queue =
2795 local->hw.offchannel_tx_hw_queue;
2796 }
2797
2798 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2799 status->band);
de1ede7a 2800 }
39192c0b
JB		 2801 dev_kfree_skb(rx->skb);
2802 return RX_QUEUED;
de1ede7a
JB		 2803}
2804
49461622 2805static ieee80211_rx_result debug_noinline
5cf121c3 2806ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2807{
eb9fb5b8 2808 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2809 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2810 __le16 stype;
571ecf67 2811
77a121c3 2812 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2813
77a121c3
JB		 2814 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2815 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2816 sdata->vif.type != NL80211_IFTYPE_STATION)
2817 return RX_DROP_MONITOR;
472dbc45 2818
77a121c3 2819 switch (stype) {
66e67e41 2820 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2821 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2822 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2823 /* process for all: mesh, mlme, ibss */
2824 break;
66e67e41
JB		 2825 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2826 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2827 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2828 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2829 if (is_multicast_ether_addr(mgmt->da) &&
2830 !is_broadcast_ether_addr(mgmt->da))
2831 return RX_DROP_MONITOR;
2832
77a121c3
JB		 2833 /* process only for station */
2834 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2835 return RX_DROP_MONITOR;
2836 break;
2837 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2838 /* process only for ibss and mesh */
2839 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2840 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2841 return RX_DROP_MONITOR;
2842 break;
2843 default:
2844 return RX_DROP_MONITOR;
2845 }
f9d540ee 2846
77a121c3 2847 /* queue up frame and kick off work to process it */
c1475ca9 2848 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2849 skb_queue_tail(&sdata->skb_queue, rx->skb);
2850 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2851 if (rx->sta)
2852 rx->sta->rx_packets++;
46900298 2853
77a121c3 2854 return RX_QUEUED;
571ecf67
JB		 2855}
2856
5cf121c3 2857/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2858static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2859 struct ieee80211_rate *rate)
3d30d949
MW		 2860{
2861 struct ieee80211_sub_if_data *sdata;
2862 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2863 struct sk_buff *skb = rx->skb, *skb2;
2864 struct net_device *prev_dev = NULL;
eb9fb5b8 2865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2866 int needed_headroom;
3d30d949 2867
554891e6
JB		 2868 /*
2869 * If cooked monitor has been processed already, then
2870 * don't do it again. If not, set the flag.
2871 */
2872 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2873 goto out_free_skb;
554891e6 2874 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2875
152c477a
JB		 2876 /* If there are no cooked monitor interfaces, just free the SKB */
2877 if (!local->cooked_mntrs)
2878 goto out_free_skb;
2879
293702a3 2880 /* room for the radiotap header based on driver features */
90b9e446 2881 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2882
293702a3
JB		 2883 if (skb_headroom(skb) < needed_headroom &&
2884 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2885 goto out_free_skb;
3d30d949 2886
293702a3 2887 /* prepend radiotap information */
973ef21a
FF		 2888 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2889 false);
3d30d949
MW		 2890
2891 skb_set_mac_header(skb, 0);
2892 skb->ip_summed = CHECKSUM_UNNECESSARY;
2893 skb->pkt_type = PACKET_OTHERHOST;
2894 skb->protocol = htons(ETH_P_802_2);
2895
2896 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2897 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2898 continue;
2899
05c914fe 2900 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2901 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2902 continue;
2903
2904 if (prev_dev) {
2905 skb2 = skb_clone(skb, GFP_ATOMIC);
2906 if (skb2) {
2907 skb2->dev = prev_dev;
5548a8a1 2908 netif_receive_skb(skb2);
3d30d949
MW		 2909 }
2910 }
2911
2912 prev_dev = sdata->dev;
2913 sdata->dev->stats.rx_packets++;
2914 sdata->dev->stats.rx_bytes += skb->len;
2915 }
2916
2917 if (prev_dev) {
2918 skb->dev = prev_dev;
5548a8a1 2919 netif_receive_skb(skb);
554891e6
JB		 2920 return;
2921 }
3d30d949
MW		 2922
2923 out_free_skb:
2924 dev_kfree_skb(skb);
2925}
2926
aa0c8636
CL		 2927static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2928 ieee80211_rx_result res)
2929{
2930 switch (res) {
2931 case RX_DROP_MONITOR:
2932 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2933 if (rx->sta)
2934 rx->sta->rx_dropped++;
2935 /* fall through */
2936 case RX_CONTINUE: {
2937 struct ieee80211_rate *rate = NULL;
2938 struct ieee80211_supported_band *sband;
2939 struct ieee80211_rx_status *status;
2940
2941 status = IEEE80211_SKB_RXCB((rx->skb));
2942
2943 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2944 if (!(status->flag & RX_FLAG_HT) &&
2945 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2946 rate = &sband->bitrates[status->rate_idx];
2947
2948 ieee80211_rx_cooked_monitor(rx, rate);
2949 break;
2950 }
2951 case RX_DROP_UNUSABLE:
2952 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2953 if (rx->sta)
2954 rx->sta->rx_dropped++;
2955 dev_kfree_skb(rx->skb);
2956 break;
2957 case RX_QUEUED:
2958 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2959 break;
2960 }
2961}
571ecf67 2962
f9e124fb
CL		 2963static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2964 struct sk_buff_head *frames)
58905290 2965{
58905290 2966 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2967 struct sk_buff *skb;
8944b79f 2968
e32f85f7
LCC		 2969#define CALL_RXH(rxh) \
2970 do { \
2971 res = rxh(rx); \
2972 if (res != RX_CONTINUE) \
2569a826 2973 goto rxh_next; \
e32f85f7 2974 } while (0);
49461622 2975
f9e124fb 2976 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2977
f9e124fb 2978 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2979 /*
2980 * all the other fields are valid across frames
2981 * that belong to an aMPDU since they are on the
2982 * same TID from the same station
2983 */
2984 rx->skb = skb;
2985
2569a826 2986 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2987 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 2988 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 2989 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 2990 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2991 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2992 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2993#ifdef CONFIG_MAC80211_MESH
aa0c8636 2994 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2995 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2996#endif
2154c81c 2997 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2998 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2999
3000 /* special treatment -- needs the queue */
3001 res = ieee80211_rx_h_ctrl(rx, frames);
3002 if (res != RX_CONTINUE)
3003 goto rxh_next;
3004
2e161f78 3005 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3006 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3007 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3008 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3009 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3010
aa0c8636
CL		 3011 rxh_next:
3012 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3013
49461622 3014#undef CALL_RXH
aa0c8636 3015 }
24a8fdad 3016
f9e124fb 3017 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3018}
3019
4406c376 3020static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3021{
f9e124fb 3022 struct sk_buff_head reorder_release;
aa0c8636
CL		 3023 ieee80211_rx_result res = RX_DROP_MONITOR;
3024
f9e124fb
CL		 3025 __skb_queue_head_init(&reorder_release);
3026
aa0c8636
CL		 3027#define CALL_RXH(rxh) \
3028 do { \
3029 res = rxh(rx); \
3030 if (res != RX_CONTINUE) \
3031 goto rxh_next; \
3032 } while (0);
3033
aa0c8636
CL		 3034 CALL_RXH(ieee80211_rx_h_check)
3035
f9e124fb 3036 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3037
f9e124fb 3038 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3039 return;
49461622 3040
2569a826 3041 rxh_next:
aa0c8636
CL		 3042 ieee80211_rx_handlers_result(rx, res);
3043
3044#undef CALL_RXH
58905290
JB		 3045}
3046
2bff8ebf 3047/*
dd318575
JB		 3048 * This function makes calls into the RX path, therefore
3049 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3050 */
3051void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3052{
f9e124fb 3053 struct sk_buff_head frames;
554891e6
JB		 3054 struct ieee80211_rx_data rx = {
3055 .sta = sta,
3056 .sdata = sta->sdata,
3057 .local = sta->local,
9e26297a
JB		 3058 /* This is OK -- must be QoS data frame */
3059 .security_idx = tid,
3060 .seqno_idx = tid,
fcf8bd3b 3061 .flags = 0,
554891e6 3062 };
2c15a0cf
CL		 3063 struct tid_ampdu_rx *tid_agg_rx;
3064
3065 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3066 if (!tid_agg_rx)
3067 return;
2bff8ebf 3068
f9e124fb
CL		 3069 __skb_queue_head_init(&frames);
3070
2c15a0cf 3071 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3072 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3073 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3074
f9e124fb 3075 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3076}
3077
571ecf67
JB		 3078/* main receive path */
3079
20b01f80 3080static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 3081 struct ieee80211_hdr *hdr)
3082{
20b01f80 3083 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3084 struct sk_buff *skb = rx->skb;
3085 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3086 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3087 int multicast = is_multicast_ether_addr(hdr->addr1);
3088
51fb61e7 3089 switch (sdata->vif.type) {
05c914fe 3090 case NL80211_IFTYPE_STATION:
9bc383de 3091 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 3092 return 0;
77fdaa12 3093 if (!multicast &&
b203ca39 3094 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3095 if (!(sdata->dev->flags & IFF_PROMISC) ||
3096 sdata->u.mgd.use_4addr)
23a24def 3097 return 0;
554891e6 3098 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3099 }
3100 break;
05c914fe 3101 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 3102 if (!bssid)
3103 return 0;
6329b8d9
FF		 3104 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3105 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3106 return 0;
a7767f95 3107 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 3108 return 1;
d48b2968
JB		 3109 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3110 return 0;
23a24def 3111 } else if (!multicast &&
b203ca39 3112 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3113 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 3114 return 0;
554891e6 3115 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3116 } else if (!rx->sta) {
3117 int rate_idx;
5614618e
JB		 3118 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3119 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3120 else
eb9fb5b8 3121 rate_idx = status->rate_idx;
8bf11d8d
JB		 3122 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3123 BIT(rate_idx));
0fb8ca45 3124 }
23a24def 3125 break;
05c914fe 3126 case NL80211_IFTYPE_MESH_POINT:
6032f934 3127 if (!multicast &&
b203ca39 3128 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 3129 if (!(sdata->dev->flags & IFF_PROMISC))
3130 return 0;
3131
554891e6 3132 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3133 }
3134 break;
05c914fe
JB		 3135 case NL80211_IFTYPE_AP_VLAN:
3136 case NL80211_IFTYPE_AP:
23a24def 3137 if (!bssid) {
b203ca39 3138 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 3139 return 0;
f142c6b9 3140 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3141 /*
3142 * Accept public action frames even when the
3143 * BSSID doesn't match, this is used for P2P
3144 * and location updates. Note that mac80211
3145 * itself never looks at these frames.
3146 */
2b9ccd4e
JB		 3147 if (!multicast &&
3148 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3149 return 0;
d48b2968 3150 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 3151 return 1;
d48b2968 3152 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 3153 return 0;
554891e6 3154 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3155 }
23a24def 3156 break;
05c914fe 3157 case NL80211_IFTYPE_WDS:
a7767f95 3158 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 3159 return 0;
b203ca39 3160 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 3161 return 0;
3162 break;
f142c6b9
JB		 3163 case NL80211_IFTYPE_P2P_DEVICE:
3164 if (!ieee80211_is_public_action(hdr, skb->len) &&
3165 !ieee80211_is_probe_req(hdr->frame_control) &&
3166 !ieee80211_is_probe_resp(hdr->frame_control) &&
3167 !ieee80211_is_beacon(hdr->frame_control))
3168 return 0;
1b737f88
JB		 3169 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3170 !multicast)
f142c6b9
JB		 3171 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3172 break;
2ca27bcf 3173 default:
fb1c1cd6 3174 /* should never get here */
f142c6b9 3175 WARN_ON_ONCE(1);
fb1c1cd6 3176 break;
23a24def
JB		 3177 }
3178
3179 return 1;
3180}
3181
4406c376
JB		 3182/*
3183 * This function returns whether or not the SKB
3184 * was destined for RX processing or not, which,
3185 * if consume is true, is equivalent to whether
3186 * or not the skb was consumed.
3187 */
3188static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3189 struct sk_buff *skb, bool consume)
3190{
3191 struct ieee80211_local *local = rx->local;
3192 struct ieee80211_sub_if_data *sdata = rx->sdata;
3193 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3194 struct ieee80211_hdr *hdr = (void *)skb->data;
3195 int prepares;
3196
3197 rx->skb = skb;
554891e6 3198 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3199 prepares = prepare_for_handlers(rx, hdr);
3200
3201 if (!prepares)
3202 return false;
3203
4406c376
JB		 3204 if (!consume) {
3205 skb = skb_copy(skb, GFP_ATOMIC);
3206 if (!skb) {
3207 if (net_ratelimit())
3208 wiphy_debug(local->hw.wiphy,
b305dae4 3209 "failed to copy skb for %s\n",
4406c376
JB		 3210 sdata->name);
3211 return true;
3212 }
3213
3214 rx->skb = skb;
3215 }
3216
3217 ieee80211_invoke_rx_handlers(rx);
3218 return true;
3219}
3220
571ecf67 3221/*
6368e4b1
RR		 3222 * This is the actual Rx frames handler. as it blongs to Rx path it must
3223 * be called with rcu_read_lock protection.
571ecf67 3224 */
71ebb4aa 3225static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3226 struct sk_buff *skb)
571ecf67
JB		 3227{
3228 struct ieee80211_local *local = hw_to_local(hw);
3229 struct ieee80211_sub_if_data *sdata;
571ecf67 3230 struct ieee80211_hdr *hdr;
e3cf8b3f 3231 __le16 fc;
5cf121c3 3232 struct ieee80211_rx_data rx;
4406c376 3233 struct ieee80211_sub_if_data *prev;
56af3268 3234 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3235 int err = 0;
571ecf67 3236
e3cf8b3f 3237 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3238 memset(&rx, 0, sizeof(rx));
3239 rx.skb = skb;
3240 rx.local = local;
72abd81b 3241
e3cf8b3f 3242 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3243 local->dot11ReceivedFragmentCount++;
571ecf67 3244
4a4f1a58
JB		 3245 if (ieee80211_is_mgmt(fc)) {
3246 /* drop frame if too short for header */
3247 if (skb->len < ieee80211_hdrlen(fc))
3248 err = -ENOBUFS;
3249 else
3250 err = skb_linearize(skb);
3251 } else {
e3cf8b3f 3252 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3253 }
e3cf8b3f
ZY		 3254
3255 if (err) {
3256 dev_kfree_skb(skb);
3257 return;
3258 }
3259
3260 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3261 ieee80211_parse_qos(&rx);
d1c3a37c 3262 ieee80211_verify_alignment(&rx);
38f3714d 3263
d48b2968
JB		 3264 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3265 ieee80211_is_beacon(hdr->frame_control)))
3266 ieee80211_scan_rx(local, skb);
3267
e3cf8b3f 3268 if (ieee80211_is_data(fc)) {
56af3268 3269 prev_sta = NULL;
4406c376 3270
7852e361 3271 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3272 if (!prev_sta) {
3273 prev_sta = sta;
3274 continue;
3275 }
3276
3277 rx.sta = prev_sta;
3278 rx.sdata = prev_sta->sdata;
4406c376 3279 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3280
56af3268 3281 prev_sta = sta;
4406c376 3282 }
56af3268
BG		 3283
3284 if (prev_sta) {
3285 rx.sta = prev_sta;
3286 rx.sdata = prev_sta->sdata;
3287
4406c376 3288 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3289 return;
8e26d5ad 3290 goto out;
56af3268 3291 }
4406c376
JB		 3292 }
3293
4b0dd98e 3294 prev = NULL;
b2e7771e 3295
4b0dd98e
JB		 3296 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3297 if (!ieee80211_sdata_running(sdata))
3298 continue;
340e11f3 3299
4b0dd98e
JB		 3300 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3301 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3302 continue;
340e11f3 3303
4b0dd98e
JB		 3304 /*
3305 * frame is destined for this interface, but if it's
3306 * not also for the previous one we handle that after
3307 * the loop to avoid copying the SKB once too much
3308 */
4bb29f8c 3309
4b0dd98e 3310 if (!prev) {
abe60632 3311 prev = sdata;
4b0dd98e 3312 continue;
340e11f3 3313 }
4bb29f8c 3314
7852e361 3315 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3316 rx.sdata = prev;
3317 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3318
4b0dd98e
JB		 3319 prev = sdata;
3320 }
3321
3322 if (prev) {
7852e361 3323 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3324 rx.sdata = prev;
4406c376 3325
4b0dd98e
JB		 3326 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3327 return;
571ecf67 3328 }
4406c376 3329
8e26d5ad 3330 out:
4406c376 3331 dev_kfree_skb(skb);
571ecf67 3332}
6368e4b1
RR		 3333
3334/*
3335 * This is the receive path handler. It is called by a low level driver when an
3336 * 802.11 MPDU is received from the hardware.
3337 */
103bf9f7 3338void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3339{
3340 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3341 struct ieee80211_rate *rate = NULL;
3342 struct ieee80211_supported_band *sband;
f1d58c25 3343 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3344
d20ef63d
JB		 3345 WARN_ON_ONCE(softirq_count() == 0);
3346
444e3803 3347 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3348 goto drop;
8318d78a
JB		 3349
3350 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3351 if (WARN_ON(!sband))
3352 goto drop;
8318d78a 3353
89c3a8ac
JB		 3354 /*
3355 * If we're suspending, it is possible although not too likely
3356 * that we'd be receiving frames after having already partially
3357 * quiesced the stack. We can't process such frames then since
3358 * that might, for example, cause stations to be added or other
3359 * driver callbacks be invoked.
3360 */
77a980dc
JB		 3361 if (unlikely(local->quiescing || local->suspended))
3362 goto drop;
89c3a8ac 3363
04800ada
AN		 3364 /* We might be during a HW reconfig, prevent Rx for the same reason */
3365 if (unlikely(local->in_reconfig))
3366 goto drop;
3367
ea77f12f
JB		 3368 /*
3369 * The same happens when we're not even started,
3370 * but that's worth a warning.
3371 */
77a980dc
JB		 3372 if (WARN_ON(!local->started))
3373 goto drop;
ea77f12f 3374
fc885189 3375 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3376 /*
fc885189
JB		 3377 * Validate the rate, unless a PLCP error means that
3378 * we probably can't have a valid rate here anyway.
e5d6eb83 3379 */
fc885189
JB		 3380
3381 if (status->flag & RX_FLAG_HT) {
3382 /*
3383 * rate_idx is MCS index, which can be [0-76]
3384 * as documented on:
3385 *
3386 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3387 *
3388 * Anything else would be some sort of driver or
3389 * hardware error. The driver should catch hardware
3390 * errors.
3391 */
444e3803 3392 if (WARN(status->rate_idx > 76,
fc885189
JB		 3393 "Rate marked as an HT rate but passed "
3394 "status->rate_idx is not "
3395 "an MCS index [0-76]: %d (0x%02x)\n",
3396 status->rate_idx,
3397 status->rate_idx))
3398 goto drop;
5614618e
JB		 3399 } else if (status->flag & RX_FLAG_VHT) {
3400 if (WARN_ONCE(status->rate_idx > 9 ||
3401 !status->vht_nss ||
3402 status->vht_nss > 8,
3403 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3404 status->rate_idx, status->vht_nss))
3405 goto drop;
fc885189 3406 } else {
444e3803 3407 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3408 goto drop;
3409 rate = &sband->bitrates[status->rate_idx];
3410 }
0fb8ca45 3411 }
6368e4b1 3412
554891e6
JB		 3413 status->rx_flags = 0;
3414
6368e4b1
RR		 3415 /*
3416 * key references and virtual interfaces are protected using RCU
3417 * and this requires that we are in a read-side RCU section during
3418 * receive processing
3419 */
3420 rcu_read_lock();
3421
3422 /*
3423 * Frames with failed FCS/PLCP checksum are not returned,
3424 * all other frames are returned without radiotap header
3425 * if it was previously present.
3426 * Also, frames with less than 16 bytes are dropped.
3427 */
f1d58c25 3428 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3429 if (!skb) {
3430 rcu_read_unlock();
3431 return;
3432 }
3433
e1e54068
JB		 3434 ieee80211_tpt_led_trig_rx(local,
3435 ((struct ieee80211_hdr *)skb->data)->frame_control,
3436 skb->len);
071d9ac2 3437 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3438
3439 rcu_read_unlock();
77a980dc
JB		 3440
3441 return;
3442 drop:
3443 kfree_skb(skb);
6368e4b1 3444}
103bf9f7 3445EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3446
3447/* This is a version of the rx handler that can be called from hard irq
3448 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3449void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3450{
3451 struct ieee80211_local *local = hw_to_local(hw);
3452
3453 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3454
571ecf67
JB		 3455 skb->pkt_type = IEEE80211_RX_MSG;
3456 skb_queue_tail(&local->skb_queue, skb);
3457 tasklet_schedule(&local->tasklet);
3458}
3459EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)