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cfg80211: export cfg80211_ref_bss
[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>
22
23#include "ieee80211_i.h"
24487981 24#include "driver-ops.h"
2c8dccc7 25#include "led.h"
33b64eb2 26#include "mesh.h"
571ecf67
JB		 27#include "wep.h"
28#include "wpa.h"
29#include "tkip.h"
30#include "wme.h"
1d8d3dec 31#include "rate.h"
571ecf67 32
b2e7771e
JB		 33/*
34 * monitor mode reception
35 *
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
38 */
39static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 40 struct sk_buff *skb)
b2e7771e 41{
b2e7771e
JB		 42 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
43 if (likely(skb->len > FCS_LEN))
e3cf8b3f 44 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 45 else {
46 /* driver bug */
47 WARN_ON(1);
48 dev_kfree_skb(skb);
49 skb = NULL;
50 }
51 }
52
53 return skb;
54}
55
f1d58c25 56static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 57 int present_fcs_len)
b2e7771e 58{
f1d58c25 59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 60 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 61
62 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
63 return 1;
0869aea0 64 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 65 return 1;
87228f57
HH		 66 if (ieee80211_is_ctl(hdr->frame_control) &&
67 !ieee80211_is_pspoll(hdr->frame_control) &&
68 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 69 return 1;
70 return 0;
71}
72
601ae7f2
BR		 73static int
74ieee80211_rx_radiotap_len(struct ieee80211_local *local,
75 struct ieee80211_rx_status *status)
76{
77 int len;
78
79 /* always present fields */
80 len = sizeof(struct ieee80211_radiotap_header) + 9;
81
6ebacbb7 82 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 83 len += 8;
7fee5372 84 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 85 len += 1;
601ae7f2
BR		 86
87 if (len & 1) /* padding for RX_FLAGS if necessary */
88 len++;
89
6d744bac
JB		 90 if (status->flag & RX_FLAG_HT) /* HT info */
91 len += 3;
92
601ae7f2
BR		 93 return len;
94}
95
d1c3a37c 96/*
601ae7f2
BR		 97 * ieee80211_add_rx_radiotap_header - add radiotap header
98 *
99 * add a radiotap header containing all the fields which the hardware provided.
100 */
101static void
102ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
103 struct sk_buff *skb,
601ae7f2
BR		 104 struct ieee80211_rate *rate,
105 int rtap_len)
106{
f1d58c25 107 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 108 struct ieee80211_radiotap_header *rthdr;
109 unsigned char *pos;
6a86b9c7 110 u16 rx_flags = 0;
601ae7f2
BR		 111
112 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
113 memset(rthdr, 0, rtap_len);
114
115 /* radiotap header, set always present flags */
116 rthdr->it_present =
117 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 118 (1 << IEEE80211_RADIOTAP_CHANNEL) |
119 (1 << IEEE80211_RADIOTAP_ANTENNA) |
120 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
121 rthdr->it_len = cpu_to_le16(rtap_len);
122
123 pos = (unsigned char *)(rthdr+1);
124
125 /* the order of the following fields is important */
126
127 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 128 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 129 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 130 rthdr->it_present |=
131 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
132 pos += 8;
133 }
134
135 /* IEEE80211_RADIOTAP_FLAGS */
136 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
137 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 138 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
139 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 140 if (status->flag & RX_FLAG_SHORTPRE)
141 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 142 pos++;
143
144 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 145 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 146 /*
f8d1ccf1 147 * Without rate information don't add it. If we have,
38f37be2 148 * MCS information is a separate field in radiotap,
73b48099
JB		 149 * added below. The byte here is needed as padding
150 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 151 */
152 *pos = 0;
8d6f658e 153 } else {
ebe6c7ba 154 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 155 *pos = rate->bitrate / 5;
8d6f658e 156 }
601ae7f2
BR		 157 pos++;
158
159 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 160 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 161 pos += 2;
162 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 163 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
164 pos);
5f0b7de5
JB		 165 else if (status->flag & RX_FLAG_HT)
166 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
167 pos);
f8d1ccf1 168 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
170 pos);
f8d1ccf1 171 else if (rate)
6a86b9c7
JB		 172 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
173 pos);
f8d1ccf1
JB		 174 else
175 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 176 pos += 2;
177
178 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
179 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
180 *pos = status->signal;
181 rthdr->it_present |=
182 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
183 pos++;
184 }
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
187
188 /* IEEE80211_RADIOTAP_ANTENNA */
189 *pos = status->antenna;
190 pos++;
191
601ae7f2
BR		 192 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
193
194 /* IEEE80211_RADIOTAP_RX_FLAGS */
195 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 196 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 197 pos++;
aae89831 198 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 199 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
200 put_unaligned_le16(rx_flags, pos);
601ae7f2 201 pos += 2;
6d744bac
JB		 202
203 if (status->flag & RX_FLAG_HT) {
204 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
205 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
206 IEEE80211_RADIOTAP_MCS_HAVE_GI |
207 IEEE80211_RADIOTAP_MCS_HAVE_BW;
208 *pos = 0;
209 if (status->flag & RX_FLAG_SHORT_GI)
210 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
211 if (status->flag & RX_FLAG_40MHZ)
212 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
213 pos++;
214 *pos++ = status->rate_idx;
215 }
601ae7f2
BR		 216}
217
b2e7771e
JB		 218/*
219 * This function copies a received frame to all monitor interfaces and
220 * returns a cleaned-up SKB that no longer includes the FCS nor the
221 * radiotap header the driver might have added.
222 */
223static struct sk_buff *
224ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 225 struct ieee80211_rate *rate)
b2e7771e 226{
f1d58c25 227 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 228 struct ieee80211_sub_if_data *sdata;
b2e7771e 229 int needed_headroom = 0;
b2e7771e
JB		 230 struct sk_buff *skb, *skb2;
231 struct net_device *prev_dev = NULL;
232 int present_fcs_len = 0;
b2e7771e
JB		 233
234 /*
235 * First, we may need to make a copy of the skb because
236 * (1) we need to modify it for radiotap (if not present), and
237 * (2) the other RX handlers will modify the skb we got.
238 *
239 * We don't need to, of course, if we aren't going to return
240 * the SKB because it has a bad FCS/PLCP checksum.
241 */
0869aea0
JB		 242
243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 245
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
248
e3cf8b3f
ZY		 249 /* make sure hdr->frame_control is on the linear part */
250 if (!pskb_may_pull(origskb, 2)) {
251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
b2e7771e 255 if (!local->monitors) {
0869aea0 256 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 257 dev_kfree_skb(origskb);
258 return NULL;
259 }
260
0869aea0 261 return remove_monitor_info(local, origskb);
b2e7771e
JB		 262 }
263
0869aea0 264 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 265 /* only need to expand headroom if necessary */
266 skb = origskb;
267 origskb = NULL;
268
269 /*
270 * This shouldn't trigger often because most devices have an
271 * RX header they pull before we get here, and that should
272 * be big enough for our radiotap information. We should
273 * probably export the length to drivers so that we can have
274 * them allocate enough headroom to start with.
275 */
276 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 277 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 278 dev_kfree_skb(skb);
279 return NULL;
280 }
281 } else {
282 /*
283 * Need to make a copy and possibly remove radiotap header
284 * and FCS from the original.
285 */
286 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
287
0869aea0 288 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 289
290 if (!skb)
291 return origskb;
292 }
293
0869aea0
JB		 294 /* prepend radiotap information */
295 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 296
ce3edf6d 297 skb_reset_mac_header(skb);
b2e7771e
JB		 298 skb->ip_summed = CHECKSUM_UNNECESSARY;
299 skb->pkt_type = PACKET_OTHERHOST;
300 skb->protocol = htons(ETH_P_802_2);
301
302 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 303 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 304 continue;
305
3d30d949
MW		 306 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
307 continue;
308
9607e6b6 309 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 310 continue;
311
b2e7771e
JB		 312 if (prev_dev) {
313 skb2 = skb_clone(skb, GFP_ATOMIC);
314 if (skb2) {
315 skb2->dev = prev_dev;
5548a8a1 316 netif_receive_skb(skb2);
b2e7771e
JB		 317 }
318 }
319
320 prev_dev = sdata->dev;
321 sdata->dev->stats.rx_packets++;
322 sdata->dev->stats.rx_bytes += skb->len;
323 }
324
325 if (prev_dev) {
326 skb->dev = prev_dev;
5548a8a1 327 netif_receive_skb(skb);
b2e7771e
JB		 328 } else
329 dev_kfree_skb(skb);
330
331 return origskb;
332}
333
334
5cf121c3 335static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 336{
238f74a2 337 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 338 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 339 int tid, seqno_idx, security_idx;
6e0d114d
JB		 340
341 /* does the frame have a qos control field? */
238f74a2
HH		 342 if (ieee80211_is_data_qos(hdr->frame_control)) {
343 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 344 /* frame has qos control */
238f74a2 345 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 346 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 347 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 348
349 seqno_idx = tid;
350 security_idx = tid;
6e0d114d 351 } else {
1411f9b5
JB		 352 /*
353 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
354 *
355 * Sequence numbers for management frames, QoS data
356 * frames with a broadcast/multicast address in the
357 * Address 1 field, and all non-QoS data frames sent
358 * by QoS STAs are assigned using an additional single
359 * modulo-4096 counter, [...]
360 *
361 * We also use that counter for non-QoS STAs.
362 */
9e26297a
JB		 363 seqno_idx = NUM_RX_DATA_QUEUES;
364 security_idx = 0;
365 if (ieee80211_is_mgmt(hdr->frame_control))
366 security_idx = NUM_RX_DATA_QUEUES;
367 tid = 0;
6e0d114d 368 }
52865dfd 369
9e26297a
JB		 370 rx->seqno_idx = seqno_idx;
371 rx->security_idx = security_idx;
6e0d114d
JB		 372 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
373 * For now, set skb->priority to 0 for other cases. */
374 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 375}
6e0d114d 376
d1c3a37c
JB		 377/**
378 * DOC: Packet alignment
379 *
380 * Drivers always need to pass packets that are aligned to two-byte boundaries
381 * to the stack.
382 *
383 * Additionally, should, if possible, align the payload data in a way that
384 * guarantees that the contained IP header is aligned to a four-byte
385 * boundary. In the case of regular frames, this simply means aligning the
386 * payload to a four-byte boundary (because either the IP header is directly
387 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 388 * in front of it). If the payload data is not properly aligned and the
389 * architecture doesn't support efficient unaligned operations, mac80211
390 * will align the data.
d1c3a37c
JB		 391 *
392 * With A-MSDU frames, however, the payload data address must yield two modulo
393 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
394 * push the IP header further back to a multiple of four again. Thankfully, the
395 * specs were sane enough this time around to require padding each A-MSDU
396 * subframe to a length that is a multiple of four.
397 *
25985edc 398 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 399 * the payload is not supported, the driver is required to move the 802.11
400 * header to be directly in front of the payload in that case.
401 */
402static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 403{
59d9cb07
KV		 404#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
405 WARN_ONCE((unsigned long)rx->skb->data & 1,
406 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 407#endif
6e0d114d
JB		 408}
409
6368e4b1 410
571ecf67
JB		 411/* rx handlers */
412
49461622 413static ieee80211_rx_result debug_noinline
5cf121c3 414ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 415{
416 struct ieee80211_local *local = rx->local;
554891e6 417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 418 struct sk_buff *skb = rx->skb;
419
79f460ca
LC		 420 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
421 !local->sched_scanning))
4080c7cd
JB		 422 return RX_CONTINUE;
423
b23b025f 424 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 425 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
426 local->sched_scanning)
f1d58c25 427 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 428
4080c7cd
JB		 429 /* scanning finished during invoking of handlers */
430 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
431 return RX_DROP_UNUSABLE;
571ecf67
JB		 432}
433
3cfcf6ac
JM		 434
435static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
436{
437 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
438
439 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
440 return 0;
441
442 return ieee80211_is_robust_mgmt_frame(hdr);
443}
444
445
446static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
447{
448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
449
450 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
451 return 0;
452
453 return ieee80211_is_robust_mgmt_frame(hdr);
454}
455
456
457/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
458static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
459{
460 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
461 struct ieee80211_mmie *mmie;
462
463 if (skb->len < 24 + sizeof(*mmie) ||
464 !is_multicast_ether_addr(hdr->da))
465 return -1;
466
467 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
468 return -1; /* not a robust management frame */
469
470 mmie = (struct ieee80211_mmie *)
471 (skb->data + skb->len - sizeof(*mmie));
472 if (mmie->element_id != WLAN_EID_MMIE ||
473 mmie->length != sizeof(*mmie) - 2)
474 return -1;
475
476 return le16_to_cpu(mmie->key_id);
477}
478
479
33b64eb2 480static ieee80211_rx_result
5cf121c3 481ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 482{
a7767f95 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 484 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 485
a7767f95 486 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 487 if (is_multicast_ether_addr(hdr->addr1)) {
488 if (ieee80211_has_tods(hdr->frame_control) ||
489 !ieee80211_has_fromds(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
493 } else {
494 if (!ieee80211_has_a4(hdr->frame_control))
495 return RX_DROP_MONITOR;
496 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
497 return RX_DROP_MONITOR;
498 }
33b64eb2
LCC		 499 }
500
501 /* If there is not an established peer link and this is not a peer link
502 * establisment frame, beacon or probe, drop the frame.
503 */
504
57cf8043 505 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 506 struct ieee80211_mgmt *mgmt;
d6d1a5a7 507
a7767f95 508 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 509 return RX_DROP_MONITOR;
510
a7767f95 511 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 512 u8 category;
33b64eb2 513 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 514 category = mgmt->u.action.category;
515 if (category != WLAN_CATEGORY_MESH_ACTION &&
516 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 517 return RX_DROP_MONITOR;
33b64eb2 518 return RX_CONTINUE;
33b64eb2
LCC		 519 }
520
a7767f95
HH		 521 if (ieee80211_is_probe_req(hdr->frame_control) ||
522 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 523 ieee80211_is_beacon(hdr->frame_control) ||
524 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 525 return RX_CONTINUE;
526
527 return RX_DROP_MONITOR;
528
529 }
530
902acc78
JB		 531 return RX_CONTINUE;
532}
33b64eb2 533
1edfb1af
JB		 534#define SEQ_MODULO 0x1000
535#define SEQ_MASK 0xfff
536
537static inline int seq_less(u16 sq1, u16 sq2)
538{
539 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
540}
541
542static inline u16 seq_inc(u16 sq)
543{
544 return (sq + 1) & SEQ_MASK;
545}
546
547static inline u16 seq_sub(u16 sq1, u16 sq2)
548{
549 return (sq1 - sq2) & SEQ_MASK;
550}
551
552
553static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
554 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 555 int index)
1edfb1af 556{
24a8fdad 557 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 558 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 559 struct ieee80211_rx_status *status;
1edfb1af 560
dd318575
JB		 561 lockdep_assert_held(&tid_agg_rx->reorder_lock);
562
1edfb1af
JB		 563 if (!skb)
564 goto no_frame;
565
071d9ac2 566 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 567 tid_agg_rx->stored_mpdu_num--;
568 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 569 status = IEEE80211_SKB_RXCB(skb);
570 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 571 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 572
573no_frame:
574 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
575}
576
577static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
578 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 579 u16 head_seq_num)
1edfb1af
JB		 580{
581 int index;
582
dd318575
JB		 583 lockdep_assert_held(&tid_agg_rx->reorder_lock);
584
1edfb1af
JB		 585 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
586 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
587 tid_agg_rx->buf_size;
24a8fdad 588 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 589 }
590}
591
592/*
593 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
594 * the skb was added to the buffer longer than this time ago, the earlier
595 * frames that have not yet been received are assumed to be lost and the skb
596 * can be released for processing. This may also release other skb's from the
597 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 598 *
599 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 600 */
601#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
602
aa0c8636 603static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 604 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 605{
2bff8ebf 606 int index, j;
aa0c8636 607
dd318575
JB		 608 lockdep_assert_held(&tid_agg_rx->reorder_lock);
609
aa0c8636
CL		 610 /* release the buffer until next missing frame */
611 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
612 tid_agg_rx->buf_size;
613 if (!tid_agg_rx->reorder_buf[index] &&
614 tid_agg_rx->stored_mpdu_num > 1) {
615 /*
616 * No buffers ready to be released, but check whether any
617 * frames in the reorder buffer have timed out.
618 */
aa0c8636
CL		 619 int skipped = 1;
620 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
621 j = (j + 1) % tid_agg_rx->buf_size) {
622 if (!tid_agg_rx->reorder_buf[j]) {
623 skipped++;
624 continue;
625 }
499fe9a4
DH		 626 if (skipped &&
627 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 628 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 629 goto set_release_timer;
aa0c8636
CL		 630
631#ifdef CONFIG_MAC80211_HT_DEBUG
632 if (net_ratelimit())
0fb9a9ec
JP		 633 wiphy_debug(hw->wiphy,
634 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 635#endif
24a8fdad 636 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 637
638 /*
639 * Increment the head seq# also for the skipped slots.
640 */
641 tid_agg_rx->head_seq_num =
642 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
643 skipped = 0;
644 }
645 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 646 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 647 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
648 tid_agg_rx->buf_size;
649 }
2bff8ebf
CL		 650
651 if (tid_agg_rx->stored_mpdu_num) {
652 j = index = seq_sub(tid_agg_rx->head_seq_num,
653 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
654
655 for (; j != (index - 1) % tid_agg_rx->buf_size;
656 j = (j + 1) % tid_agg_rx->buf_size) {
657 if (tid_agg_rx->reorder_buf[j])
658 break;
659 }
660
661 set_release_timer:
662
663 mod_timer(&tid_agg_rx->reorder_timer,
334df731 664 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 665 HT_RX_REORDER_BUF_TIMEOUT);
666 } else {
667 del_timer(&tid_agg_rx->reorder_timer);
668 }
aa0c8636
CL		 669}
670
1edfb1af
JB		 671/*
672 * As this function belongs to the RX path it must be under
673 * rcu_read_lock protection. It returns false if the frame
674 * can be processed immediately, true if it was consumed.
675 */
676static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
677 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 678 struct sk_buff *skb)
1edfb1af
JB		 679{
680 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
681 u16 sc = le16_to_cpu(hdr->seq_ctrl);
682 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
683 u16 head_seq_num, buf_size;
684 int index;
2bff8ebf 685 bool ret = true;
1edfb1af 686
dd318575
JB		 687 spin_lock(&tid_agg_rx->reorder_lock);
688
1edfb1af
JB		 689 buf_size = tid_agg_rx->buf_size;
690 head_seq_num = tid_agg_rx->head_seq_num;
691
692 /* frame with out of date sequence number */
693 if (seq_less(mpdu_seq_num, head_seq_num)) {
694 dev_kfree_skb(skb);
2bff8ebf 695 goto out;
1edfb1af
JB		 696 }
697
698 /*
699 * If frame the sequence number exceeds our buffering window
700 * size release some previous frames to make room for this one.
701 */
702 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
703 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
704 /* release stored frames up to new head to stack */
24a8fdad 705 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 706 }
707
708 /* Now the new frame is always in the range of the reordering buffer */
709
710 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
711
712 /* check if we already stored this frame */
713 if (tid_agg_rx->reorder_buf[index]) {
714 dev_kfree_skb(skb);
2bff8ebf 715 goto out;
1edfb1af
JB		 716 }
717
718 /*
719 * If the current MPDU is in the right order and nothing else
720 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 721 * If it is first but there's something stored, we may be able
722 * to release frames after this one.
1edfb1af
JB		 723 */
724 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
725 tid_agg_rx->stored_mpdu_num == 0) {
726 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 727 ret = false;
728 goto out;
1edfb1af
JB		 729 }
730
731 /* put the frame in the reordering buffer */
732 tid_agg_rx->reorder_buf[index] = skb;
733 tid_agg_rx->reorder_time[index] = jiffies;
734 tid_agg_rx->stored_mpdu_num++;
24a8fdad 735 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 736
2bff8ebf
CL		 737 out:
738 spin_unlock(&tid_agg_rx->reorder_lock);
739 return ret;
1edfb1af
JB		 740}
741
742/*
743 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
744 * true if the MPDU was buffered, false if it should be processed.
745 */
24a8fdad 746static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 747{
2569a826
JB		 748 struct sk_buff *skb = rx->skb;
749 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 750 struct ieee80211_hw *hw = &local->hw;
751 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 753 struct sta_info *sta = rx->sta;
1edfb1af
JB		 754 struct tid_ampdu_rx *tid_agg_rx;
755 u16 sc;
6cc00d54 756 u8 tid, ack_policy;
1edfb1af
JB		 757
758 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 759 goto dont_reorder;
1edfb1af
JB		 760
761 /*
762 * filter the QoS data rx stream according to
763 * STA/TID and check if this STA/TID is on aggregation
764 */
765
1edfb1af 766 if (!sta)
2569a826 767 goto dont_reorder;
1edfb1af 768
6cc00d54
TP		 769 ack_policy = *ieee80211_get_qos_ctl(hdr) &
770 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 771 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
772
a87f736d
JB		 773 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
774 if (!tid_agg_rx)
775 goto dont_reorder;
1edfb1af
JB		 776
777 /* qos null data frames are excluded */
778 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 779 goto dont_reorder;
1edfb1af 780
6cc00d54
TP		 781 /* not part of a BA session */
782 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
783 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
784 goto dont_reorder;
785
660c6a44
TP		 786 /* not actually part of this BA session */
787 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
788 goto dont_reorder;
789
1edfb1af
JB		 790 /* new, potentially un-ordered, ampdu frame - process it */
791
792 /* reset session timer */
793 if (tid_agg_rx->timeout)
794 mod_timer(&tid_agg_rx->session_timer,
795 TU_TO_EXP_TIME(tid_agg_rx->timeout));
796
797 /* if this mpdu is fragmented - terminate rx aggregation session */
798 sc = le16_to_cpu(hdr->seq_ctrl);
799 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 800 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 801 skb_queue_tail(&rx->sdata->skb_queue, skb);
802 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 803 return;
1edfb1af
JB		 804 }
805
a87f736d
JB		 806 /*
807 * No locking needed -- we will only ever process one
808 * RX packet at a time, and thus own tid_agg_rx. All
809 * other code manipulating it needs to (and does) make
810 * sure that we cannot get to it any more before doing
811 * anything with it.
812 */
24a8fdad 813 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 814 return;
815
816 dont_reorder:
24a8fdad 817 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 818}
33b64eb2 819
49461622 820static ieee80211_rx_result debug_noinline
5cf121c3 821ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 822{
a7767f95 823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 825
826 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
827 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 828 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 829 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 830 hdr->seq_ctrl)) {
554891e6 831 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 832 rx->local->dot11FrameDuplicateCount++;
833 rx->sta->num_duplicates++;
834 }
b1f93314 835 return RX_DROP_UNUSABLE;
571ecf67 836 } else
9e26297a 837 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 838 }
839
571ecf67
JB		 840 if (unlikely(rx->skb->len < 16)) {
841 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 842 return RX_DROP_MONITOR;
571ecf67
JB		 843 }
844
571ecf67
JB		 845 /* Drop disallowed frame classes based on STA auth/assoc state;
846 * IEEE 802.11, Chap 5.5.
847 *
ccd7b362
JB		 848 * mac80211 filters only based on association state, i.e. it drops
849 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 850 * deauth/disassoc frames when needed. In addition, hostapd is
851 * responsible for filtering on both auth and assoc states.
852 */
33b64eb2 853
902acc78 854 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 855 return ieee80211_rx_mesh_check(rx);
33b64eb2 856
a7767f95
HH		 857 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
858 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 859 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 860 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 861 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 862 /*
863 * accept port control frames from the AP even when it's not
864 * yet marked ASSOC to prevent a race where we don't set the
865 * assoc bit quickly enough before it sends the first frame
866 */
867 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 868 ieee80211_is_data_present(hdr->frame_control)) {
869 u16 ethertype;
870 u8 *payload;
871
872 payload = rx->skb->data +
873 ieee80211_hdrlen(hdr->frame_control);
874 ethertype = (payload[6] << 8) | payload[7];
875 if (cpu_to_be16(ethertype) ==
876 rx->sdata->control_port_protocol)
877 return RX_CONTINUE;
878 }
21fc7560
JB		 879
880 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
881 cfg80211_rx_spurious_frame(rx->sdata->dev,
882 hdr->addr2,
883 GFP_ATOMIC))
884 return RX_DROP_UNUSABLE;
885
e4c26add 886 return RX_DROP_MONITOR;
2a33bee2 887 }
571ecf67 888
9ae54c84 889 return RX_CONTINUE;
570bd537
JB		 890}
891
892
49461622 893static ieee80211_rx_result debug_noinline
5cf121c3 894ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 895{
eb9fb5b8
JB		 896 struct sk_buff *skb = rx->skb;
897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
898 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 899 int keyidx;
900 int hdrlen;
e4c26add 901 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 902 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 903 int mmie_keyidx = -1;
761ab470 904 __le16 fc;
570bd537 905
3017b80b
JB		 906 /*
907 * Key selection 101
908 *
3cfcf6ac 909 * There are four types of keys:
3017b80b 910 * - GTK (group keys)
3cfcf6ac 911 * - IGTK (group keys for management frames)
3017b80b
JB		 912 * - PTK (pairwise keys)
913 * - STK (station-to-station pairwise keys)
914 *
915 * When selecting a key, we have to distinguish between multicast
916 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 917 * use PTKs and STKs while the former always use GTKs and IGTKs.
918 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
919 * unicast frames can also use key indices like GTKs. Hence, if we
920 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 921 *
8dc06a1c
JB		 922 * Note that in a regular BSS, multicast frames are sent by the
923 * AP only, associated stations unicast the frame to the AP first
924 * which then multicasts it on their behalf.
925 *
3017b80b
JB		 926 * There is also a slight problem in IBSS mode: GTKs are negotiated
927 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 928 * The spec seems to expect that one negotiates the same key with
929 * every station but there's no such requirement; VLANs could be
930 * possible.
3017b80b
JB		 931 */
932
3017b80b 933 /*
1990af8d 934 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 935 * addressed to us nor a multicast frame.
936 */
554891e6 937 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 938 return RX_CONTINUE;
3017b80b 939
2569a826
JB		 940 /* start without a key */
941 rx->key = NULL;
942
d4e46a3d 943 if (rx->sta)
e31b8213 944 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 945
761ab470
JB		 946 fc = hdr->frame_control;
947
948 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 949 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
950
e31b8213
JB		 951 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
952 rx->key = sta_ptk;
dc1580dd
JB		 953 if ((status->flag & RX_FLAG_DECRYPTED) &&
954 (status->flag & RX_FLAG_IV_STRIPPED))
955 return RX_CONTINUE;
0c7c10c7 956 /* Skip decryption if the frame is not protected. */
761ab470 957 if (!ieee80211_has_protected(fc))
0c7c10c7 958 return RX_CONTINUE;
3cfcf6ac
JM		 959 } else if (mmie_keyidx >= 0) {
960 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 961 if ((status->flag & RX_FLAG_DECRYPTED) &&
962 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 963 return RX_CONTINUE;
964
965 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
966 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
967 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 968 if (rx->sta)
969 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
970 if (!rx->key)
971 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 972 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 973 /*
974 * The frame was not protected, so skip decryption. However, we
975 * need to set rx->key if there is a key that could have been
976 * used so that the frame may be dropped if encryption would
977 * have been expected.
978 */
979 struct ieee80211_key *key = NULL;
897bed8b
JB		 980 struct ieee80211_sub_if_data *sdata = rx->sdata;
981 int i;
982
761ab470 983 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 984 is_multicast_ether_addr(hdr->addr1) &&
985 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
986 rx->key = key;
897bed8b
JB		 987 else {
988 if (rx->sta) {
989 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
990 key = rcu_dereference(rx->sta->gtk[i]);
991 if (key)
992 break;
993 }
994 }
995 if (!key) {
996 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
997 key = rcu_dereference(sdata->keys[i]);
998 if (key)
999 break;
1000 }
1001 }
1002 if (key)
1003 rx->key = key;
1004 }
0c7c10c7 1005 return RX_CONTINUE;
571ecf67 1006 } else {
39184b15 1007 u8 keyid;
3017b80b
JB		 1008 /*
1009 * The device doesn't give us the IV so we won't be
1010 * able to look up the key. That's ok though, we
1011 * don't need to decrypt the frame, we just won't
1012 * be able to keep statistics accurate.
1013 * Except for key threshold notifications, should
1014 * we somehow allow the driver to tell us which key
1015 * the hardware used if this flag is set?
1016 */
eb9fb5b8
JB		 1017 if ((status->flag & RX_FLAG_DECRYPTED) &&
1018 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1019 return RX_CONTINUE;
3017b80b 1020
761ab470 1021 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1022
1023 if (rx->skb->len < 8 + hdrlen)
e4c26add 1024 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1025
1026 /*
1027 * no need to call ieee80211_wep_get_keyidx,
1028 * it verifies a bunch of things we've done already
1029 */
39184b15
ZY		 1030 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1031 keyidx = keyid >> 6;
3017b80b 1032
e31b8213
JB		 1033 /* check per-station GTK first, if multicast packet */
1034 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1035 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1036
e31b8213
JB		 1037 /* if not found, try default key */
1038 if (!rx->key) {
1039 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1040
1041 /*
1042 * RSNA-protected unicast frames should always be
1043 * sent with pairwise or station-to-station keys,
1044 * but for WEP we allow using a key index as well.
1045 */
1046 if (rx->key &&
1047 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1048 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1049 !is_multicast_ether_addr(hdr->addr1))
1050 rx->key = NULL;
1051 }
571ecf67
JB		 1052 }
1053
3017b80b 1054 if (rx->key) {
95acac61
JB		 1055 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1056 return RX_DROP_MONITOR;
1057
571ecf67 1058 rx->key->tx_rx_count++;
011bfcc4 1059 /* TODO: add threshold stuff again */
1990af8d 1060 } else {
e4c26add 1061 return RX_DROP_MONITOR;
70f08765
JB		 1062 }
1063
39184b15
ZY		 1064 if (skb_linearize(rx->skb))
1065 return RX_DROP_UNUSABLE;
761ab470 1066 /* the hdr variable is invalid now! */
1990af8d 1067
97359d12
JB		 1068 switch (rx->key->conf.cipher) {
1069 case WLAN_CIPHER_SUITE_WEP40:
1070 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1071 /* Check for weak IVs if possible */
1072 if (rx->sta && ieee80211_is_data(fc) &&
1073 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1074 !(status->flag & RX_FLAG_DECRYPTED)) &&
1075 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1076 rx->sta->wep_weak_iv_count++;
1077
e2f036da
MN		 1078 result = ieee80211_crypto_wep_decrypt(rx);
1079 break;
97359d12 1080 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1081 result = ieee80211_crypto_tkip_decrypt(rx);
1082 break;
97359d12 1083 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1084 result = ieee80211_crypto_ccmp_decrypt(rx);
1085 break;
97359d12 1086 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1087 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1088 break;
3ffc2a90
JB		 1089 default:
1090 /*
1091 * We can reach here only with HW-only algorithms
1092 * but why didn't it decrypt the frame?!
1093 */
1094 return RX_DROP_UNUSABLE;
70f08765
JB		 1095 }
1096
e2f036da 1097 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1098 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1099
1100 return result;
70f08765
JB		 1101}
1102
572e0012
KV		 1103static ieee80211_rx_result debug_noinline
1104ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1105{
1106 struct ieee80211_local *local;
1107 struct ieee80211_hdr *hdr;
1108 struct sk_buff *skb;
1109
1110 local = rx->local;
1111 skb = rx->skb;
1112 hdr = (struct ieee80211_hdr *) skb->data;
1113
1114 if (!local->pspolling)
1115 return RX_CONTINUE;
1116
1117 if (!ieee80211_has_fromds(hdr->frame_control))
1118 /* this is not from AP */
1119 return RX_CONTINUE;
1120
1121 if (!ieee80211_is_data(hdr->frame_control))
1122 return RX_CONTINUE;
1123
1124 if (!ieee80211_has_moredata(hdr->frame_control)) {
1125 /* AP has no more frames buffered for us */
1126 local->pspolling = false;
1127 return RX_CONTINUE;
1128 }
1129
1130 /* more data bit is set, let's request a new frame from the AP */
1131 ieee80211_send_pspoll(local, rx->sdata);
1132
1133 return RX_CONTINUE;
1134}
1135
133b8226 1136static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1137{
133b8226 1138 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1139 struct ieee80211_local *local = sdata->local;
0795af57 1140
3e122be0 1141 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1142 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1143 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1144 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1145#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1146 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1147 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1148#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1149}
1150
ff9458d3 1151static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1152{
571ecf67 1153#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1154 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
608383bf 1155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1157
c2c98fde 1158 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1159#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1160 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
608383bf 1161 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1162#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1163 return;
1164 }
1165
1166 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1167}
1168
d057e5a3
AN		 1169int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1170{
1171 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1172 bool in_ps;
1173
1174 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1175
1176 /* Don't let the same PS state be set twice */
c2c98fde 1177 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1178 if ((start && in_ps) || (!start && !in_ps))
1179 return -EINVAL;
1180
1181 if (start)
1182 ap_sta_ps_start(sta_inf);
1183 else
1184 ap_sta_ps_end(sta_inf);
1185
1186 return 0;
1187}
1188EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1189
47086fc5
JB		 1190static ieee80211_rx_result debug_noinline
1191ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1192{
1193 struct ieee80211_sub_if_data *sdata = rx->sdata;
1194 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1195 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1196 int tid, ac;
1197
1198 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1199 return RX_CONTINUE;
1200
1201 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1202 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1203 return RX_CONTINUE;
1204
1205 /*
1206 * The device handles station powersave, so don't do anything about
1207 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1208 * it to mac80211 since they're handled.)
1209 */
1210 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1211 return RX_CONTINUE;
1212
1213 /*
1214 * Don't do anything if the station isn't already asleep. In
1215 * the uAPSD case, the station will probably be marked asleep,
1216 * in the PS-Poll case the station must be confused ...
1217 */
c2c98fde 1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1219 return RX_CONTINUE;
1220
1221 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1222 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1223 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1224 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1225 else
c2c98fde 1226 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1227 }
47086fc5
JB		 1228
1229 /* Free PS Poll skb here instead of returning RX_DROP that would
1230 * count as an dropped frame. */
1231 dev_kfree_skb(rx->skb);
1232
1233 return RX_QUEUED;
1234 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1235 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1236 ieee80211_has_pm(hdr->frame_control) &&
1237 (ieee80211_is_data_qos(hdr->frame_control) ||
1238 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1239 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1240 ac = ieee802_1d_to_ac[tid & 7];
1241
1242 /*
1243 * If this AC is not trigger-enabled do nothing.
1244 *
1245 * NB: This could/should check a separate bitmap of trigger-
1246 * enabled queues, but for now we only implement uAPSD w/o
1247 * TSPEC changes to the ACs, so they're always the same.
1248 */
1249 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1250 return RX_CONTINUE;
1251
1252 /* if we are in a service period, do nothing */
c2c98fde 1253 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1254 return RX_CONTINUE;
1255
c2c98fde 1256 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1257 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1258 else
c2c98fde 1259 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1260 }
1261
1262 return RX_CONTINUE;
1263}
1264
49461622 1265static ieee80211_rx_result debug_noinline
5cf121c3 1266ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1267{
1268 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1269 struct sk_buff *skb = rx->skb;
1270 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1271 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1272
1273 if (!sta)
9ae54c84 1274 return RX_CONTINUE;
571ecf67 1275
b291ba11
JB		 1276 /*
1277 * Update last_rx only for IBSS packets which are for the current
1278 * BSSID to avoid keeping the current IBSS network alive in cases
1279 * where other STAs start using different BSSID.
1280 */
05c914fe 1281 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1282 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1283 NL80211_IFTYPE_ADHOC);
3af6334c 1284 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1285 sta->last_rx = jiffies;
3af6334c
FF		 1286 if (ieee80211_is_data(hdr->frame_control)) {
1287 sta->last_rx_rate_idx = status->rate_idx;
1288 sta->last_rx_rate_flag = status->flag;
1289 }
1290 }
b291ba11
JB		 1291 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1292 /*
33b64eb2
LCC		 1293 * Mesh beacons will update last_rx when if they are found to
1294 * match the current local configuration when processed.
571ecf67 1295 */
b291ba11 1296 sta->last_rx = jiffies;
3af6334c
FF		 1297 if (ieee80211_is_data(hdr->frame_control)) {
1298 sta->last_rx_rate_idx = status->rate_idx;
1299 sta->last_rx_rate_flag = status->flag;
1300 }
571ecf67
JB		 1301 }
1302
554891e6 1303 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1304 return RX_CONTINUE;
571ecf67 1305
3cf335d5
KV		 1306 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1307 ieee80211_sta_rx_notify(rx->sdata, hdr);
1308
571ecf67
JB		 1309 sta->rx_fragments++;
1310 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1311 sta->last_signal = status->signal;
541a45a1 1312 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1313
72eaa43a
JB		 1314 /*
1315 * Change STA power saving mode only at the end of a frame
1316 * exchange sequence.
1317 */
d057e5a3
AN		 1318 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1319 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1320 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1321 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1322 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1323 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1324 /*
1325 * Ignore doze->wake transitions that are
1326 * indicated by non-data frames, the standard
1327 * is unclear here, but for example going to
1328 * PS mode and then scanning would cause a
1329 * doze->wake transition for the probe request,
1330 * and that is clearly undesirable.
1331 */
1332 if (ieee80211_is_data(hdr->frame_control) &&
1333 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1334 ap_sta_ps_end(sta);
72eaa43a
JB		 1335 } else {
1336 if (ieee80211_has_pm(hdr->frame_control))
1337 ap_sta_ps_start(sta);
1338 }
571ecf67
JB		 1339 }
1340
22403def
JB		 1341 /*
1342 * Drop (qos-)data::nullfunc frames silently, since they
1343 * are used only to control station power saving mode.
1344 */
1345 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1346 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1347 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1348
1349 /*
1350 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1351 * that was not moved to a 4-addr STA vlan yet send
1352 * the event to userspace and for older hostapd drop
1353 * the frame to the monitor interface.
d524215f
FF		 1354 */
1355 if (ieee80211_has_a4(hdr->frame_control) &&
1356 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1357 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1358 !rx->sdata->u.vlan.sta))) {
1359 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1360 cfg80211_rx_unexpected_4addr_frame(
1361 rx->sdata->dev, sta->sta.addr,
1362 GFP_ATOMIC);
d524215f 1363 return RX_DROP_MONITOR;
e7f4a940 1364 }
22403def
JB		 1365 /*
1366 * Update counter and free packet here to avoid
1367 * counting this as a dropped packed.
1368 */
571ecf67
JB		 1369 sta->rx_packets++;
1370 dev_kfree_skb(rx->skb);
9ae54c84 1371 return RX_QUEUED;
571ecf67
JB		 1372 }
1373
9ae54c84 1374 return RX_CONTINUE;
571ecf67
JB		 1375} /* ieee80211_rx_h_sta_process */
1376
571ecf67
JB		 1377static inline struct ieee80211_fragment_entry *
1378ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1379 unsigned int frag, unsigned int seq, int rx_queue,
1380 struct sk_buff **skb)
1381{
1382 struct ieee80211_fragment_entry *entry;
1383 int idx;
1384
1385 idx = sdata->fragment_next;
1386 entry = &sdata->fragments[sdata->fragment_next++];
1387 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1388 sdata->fragment_next = 0;
1389
1390 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1391#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1392 struct ieee80211_hdr *hdr =
1393 (struct ieee80211_hdr *) entry->skb_list.next->data;
1394 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1395 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1396 "addr1=%pM addr2=%pM\n",
47846c9b 1397 sdata->name, idx,
571ecf67 1398 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1399 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1400#endif
571ecf67
JB		 1401 __skb_queue_purge(&entry->skb_list);
1402 }
1403
1404 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1405 *skb = NULL;
1406 entry->first_frag_time = jiffies;
1407 entry->seq = seq;
1408 entry->rx_queue = rx_queue;
1409 entry->last_frag = frag;
1410 entry->ccmp = 0;
1411 entry->extra_len = 0;
1412
1413 return entry;
1414}
1415
1416static inline struct ieee80211_fragment_entry *
1417ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1418 unsigned int frag, unsigned int seq,
571ecf67
JB		 1419 int rx_queue, struct ieee80211_hdr *hdr)
1420{
1421 struct ieee80211_fragment_entry *entry;
1422 int i, idx;
1423
1424 idx = sdata->fragment_next;
1425 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1426 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1427
1428 idx--;
1429 if (idx < 0)
1430 idx = IEEE80211_FRAGMENT_MAX - 1;
1431
1432 entry = &sdata->fragments[idx];
1433 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1434 entry->rx_queue != rx_queue ||
1435 entry->last_frag + 1 != frag)
1436 continue;
1437
b73d70ad 1438 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1439
b73d70ad
HH		 1440 /*
1441 * Check ftype and addresses are equal, else check next fragment
1442 */
1443 if (((hdr->frame_control ^ f_hdr->frame_control) &
1444 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1445 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1446 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1447 continue;
1448
ab46623e 1449 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1450 __skb_queue_purge(&entry->skb_list);
1451 continue;
1452 }
1453 return entry;
1454 }
1455
1456 return NULL;
1457}
1458
49461622 1459static ieee80211_rx_result debug_noinline
5cf121c3 1460ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1461{
1462 struct ieee80211_hdr *hdr;
1463 u16 sc;
358c8d9d 1464 __le16 fc;
571ecf67
JB		 1465 unsigned int frag, seq;
1466 struct ieee80211_fragment_entry *entry;
1467 struct sk_buff *skb;
554891e6 1468 struct ieee80211_rx_status *status;
571ecf67 1469
b73d70ad 1470 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1471 fc = hdr->frame_control;
571ecf67
JB		 1472 sc = le16_to_cpu(hdr->seq_ctrl);
1473 frag = sc & IEEE80211_SCTL_FRAG;
1474
358c8d9d 1475 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1476 (rx->skb)->len < 24 ||
1477 is_multicast_ether_addr(hdr->addr1))) {
1478 /* not fragmented */
1479 goto out;
1480 }
1481 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1482
e3cf8b3f
ZY		 1483 if (skb_linearize(rx->skb))
1484 return RX_DROP_UNUSABLE;
1485
058897a4
AK		 1486 /*
1487 * skb_linearize() might change the skb->data and
1488 * previously cached variables (in this case, hdr) need to
1489 * be refreshed with the new data.
1490 */
1491 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1492 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1493
1494 if (frag == 0) {
1495 /* This is the first fragment of a new frame. */
1496 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1497 rx->seqno_idx, &(rx->skb));
97359d12 1498 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1499 ieee80211_has_protected(fc)) {
9e26297a 1500 int queue = rx->security_idx;
571ecf67
JB		 1501 /* Store CCMP PN so that we can verify that the next
1502 * fragment has a sequential PN value. */
1503 entry->ccmp = 1;
1504 memcpy(entry->last_pn,
9190252c 1505 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1506 CCMP_PN_LEN);
1507 }
9ae54c84 1508 return RX_QUEUED;
571ecf67
JB		 1509 }
1510
1511 /* This is a fragment for a frame that should already be pending in
1512 * fragment cache. Add this fragment to the end of the pending entry.
1513 */
9e26297a
JB		 1514 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1515 rx->seqno_idx, hdr);
571ecf67
JB		 1516 if (!entry) {
1517 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1518 return RX_DROP_MONITOR;
571ecf67
JB		 1519 }
1520
1521 /* Verify that MPDUs within one MSDU have sequential PN values.
1522 * (IEEE 802.11i, 8.3.3.4.5) */
1523 if (entry->ccmp) {
1524 int i;
1525 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1526 int queue;
97359d12 1527 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1528 return RX_DROP_UNUSABLE;
571ecf67
JB		 1529 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1530 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1531 pn[i]++;
1532 if (pn[i])
1533 break;
1534 }
9e26297a 1535 queue = rx->security_idx;
9190252c 1536 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1537 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1538 return RX_DROP_UNUSABLE;
571ecf67
JB		 1539 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1540 }
1541
358c8d9d 1542 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1543 __skb_queue_tail(&entry->skb_list, rx->skb);
1544 entry->last_frag = frag;
1545 entry->extra_len += rx->skb->len;
358c8d9d 1546 if (ieee80211_has_morefrags(fc)) {
571ecf67 1547 rx->skb = NULL;
9ae54c84 1548 return RX_QUEUED;
571ecf67
JB		 1549 }
1550
1551 rx->skb = __skb_dequeue(&entry->skb_list);
1552 if (skb_tailroom(rx->skb) < entry->extra_len) {
1553 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1554 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1555 GFP_ATOMIC))) {
1556 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1557 __skb_queue_purge(&entry->skb_list);
e4c26add 1558 return RX_DROP_UNUSABLE;
571ecf67
JB		 1559 }
1560 }
1561 while ((skb = __skb_dequeue(&entry->skb_list))) {
1562 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1563 dev_kfree_skb(skb);
1564 }
1565
1566 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1567 status = IEEE80211_SKB_RXCB(rx->skb);
1568 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1569
1570 out:
1571 if (rx->sta)
1572 rx->sta->rx_packets++;
1573 if (is_multicast_ether_addr(hdr->addr1))
1574 rx->local->dot11MulticastReceivedFrameCount++;
1575 else
1576 ieee80211_led_rx(rx->local);
9ae54c84 1577 return RX_CONTINUE;
571ecf67
JB		 1578}
1579
76ee65bf 1580static int
5cf121c3 1581ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1582{
07346f81 1583 if (unlikely(!rx->sta ||
c2c98fde 1584 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1585 return -EACCES;
571ecf67 1586
76ee65bf 1587 return 0;
571ecf67
JB		 1588}
1589
76ee65bf 1590static int
358c8d9d 1591ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1592{
eb9fb5b8
JB		 1593 struct sk_buff *skb = rx->skb;
1594 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1595
3017b80b 1596 /*
7848ba7d
JB		 1597 * Pass through unencrypted frames if the hardware has
1598 * decrypted them already.
3017b80b 1599 */
eb9fb5b8 1600 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1601 return 0;
571ecf67
JB		 1602
1603 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1604 if (unlikely(!ieee80211_has_protected(fc) &&
1605 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1606 ieee80211_is_data(fc) &&
b3fc9c6c 1607 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1608 return -EACCES;
bef5d1c7
JB		 1609
1610 return 0;
1611}
1612
1613static int
1614ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1615{
1616 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1617 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1618 __le16 fc = hdr->frame_control;
bef5d1c7 1619
e3efca0a
JM		 1620 /*
1621 * Pass through unencrypted frames if the hardware has
1622 * decrypted them already.
1623 */
1624 if (status->flag & RX_FLAG_DECRYPTED)
1625 return 0;
bef5d1c7 1626
c2c98fde 1627 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1628 if (unlikely(!ieee80211_has_protected(fc) &&
1629 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1630 rx->key)) {
1631 if (ieee80211_is_deauth(fc))
1632 cfg80211_send_unprot_deauth(rx->sdata->dev,
1633 rx->skb->data,
1634 rx->skb->len);
1635 else if (ieee80211_is_disassoc(fc))
1636 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1637 rx->skb->data,
1638 rx->skb->len);
f2ca3ea4 1639 return -EACCES;
cf4e594e 1640 }
f2ca3ea4 1641 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1642 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1643 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1644 if (ieee80211_is_deauth(fc))
1645 cfg80211_send_unprot_deauth(rx->sdata->dev,
1646 rx->skb->data,
1647 rx->skb->len);
1648 else if (ieee80211_is_disassoc(fc))
1649 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1650 rx->skb->data,
1651 rx->skb->len);
f2ca3ea4 1652 return -EACCES;
cf4e594e 1653 }
f2ca3ea4
JM		 1654 /*
1655 * When using MFP, Action frames are not allowed prior to
1656 * having configured keys.
1657 */
1658 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1659 ieee80211_is_robust_mgmt_frame(
1660 (struct ieee80211_hdr *) rx->skb->data)))
1661 return -EACCES;
1662 }
b3fc9c6c 1663
76ee65bf 1664 return 0;
571ecf67
JB		 1665}
1666
76ee65bf 1667static int
4114fa21 1668__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1669{
eb9fb5b8 1670 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1672 bool check_port_control = false;
1673 struct ethhdr *ehdr;
1674 int ret;
f14543ee 1675
4114fa21 1676 *port_control = false;
9bc383de
JB		 1677 if (ieee80211_has_a4(hdr->frame_control) &&
1678 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1679 return -1;
9bc383de 1680
fbb327c5
FF		 1681 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1682 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1683
1684 if (!sdata->u.mgd.use_4addr)
1685 return -1;
1686 else
1687 check_port_control = true;
1688 }
1689
9bc383de 1690 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1691 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1692 return -1;
571ecf67 1693
fbb327c5 1694 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1695 if (ret < 0)
fbb327c5
FF		 1696 return ret;
1697
1698 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1699 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1700 *port_control = true;
1701 else if (check_port_control)
fbb327c5
FF		 1702 return -1;
1703
1704 return 0;
76ee65bf 1705}
571ecf67 1706
ce3edf6d
JB		 1707/*
1708 * requires that rx->skb is a frame with ethernet header
1709 */
358c8d9d 1710static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1711{
c97c23e3 1712 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1713 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1714 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1715
1716 /*
1717 * Allow EAPOL frames to us/the PAE group address regardless
1718 * of whether the frame was encrypted or not.
1719 */
a621fa4d 1720 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1721 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1722 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1723 return true;
1724
1725 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1726 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1727 return false;
1728
1729 return true;
1730}
1731
1732/*
1733 * requires that rx->skb is a frame with ethernet header
1734 */
76ee65bf 1735static void
5cf121c3 1736ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1737{
eb9fb5b8
JB		 1738 struct ieee80211_sub_if_data *sdata = rx->sdata;
1739 struct net_device *dev = sdata->dev;
76ee65bf 1740 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1741 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1742 struct sta_info *dsta;
554891e6 1743 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1744
76ee65bf
RR		 1745 skb = rx->skb;
1746 xmit_skb = NULL;
571ecf67 1747
05c914fe
JB		 1748 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1749 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1750 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1751 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1752 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1753 if (is_multicast_ether_addr(ehdr->h_dest)) {
1754 /*
1755 * send multicast frames both to higher layers in
1756 * local net stack and back to the wireless medium
1757 */
76ee65bf
RR		 1758 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1759 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1760 printk(KERN_DEBUG "%s: failed to clone "
1761 "multicast frame\n", dev->name);
1762 } else {
abe60632
JB		 1763 dsta = sta_info_get(sdata, skb->data);
1764 if (dsta) {
ce3edf6d
JB		 1765 /*
1766 * The destination station is associated to
1767 * this AP (in this VLAN), so send the frame
1768 * directly to it and do not pass it to local
1769 * net stack.
571ecf67 1770 */
76ee65bf 1771 xmit_skb = skb;
571ecf67
JB		 1772 skb = NULL;
1773 }
571ecf67
JB		 1774 }
1775 }
1776
1777 if (skb) {
d1c3a37c
JB		 1778 int align __maybe_unused;
1779
59d9cb07 1780#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1781 /*
1782 * 'align' will only take the values 0 or 2 here
1783 * since all frames are required to be aligned
1784 * to 2-byte boundaries when being passed to
1785 * mac80211. That also explains the __skb_push()
1786 * below.
1787 */
dacb6f1d 1788 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1789 if (align) {
1790 if (WARN_ON(skb_headroom(skb) < 3)) {
1791 dev_kfree_skb(skb);
1792 skb = NULL;
1793 } else {
1794 u8 *data = skb->data;
8ce0b589
ZY		 1795 size_t len = skb_headlen(skb);
1796 skb->data -= align;
1797 memmove(skb->data, data, len);
1798 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1799 }
1800 }
1801#endif
1802
1803 if (skb) {
1804 /* deliver to local stack */
1805 skb->protocol = eth_type_trans(skb, dev);
1806 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1807 netif_receive_skb(skb);
d1c3a37c 1808 }
571ecf67
JB		 1809 }
1810
76ee65bf 1811 if (xmit_skb) {
aef6c928
HS		 1812 /*
1813 * Send to wireless media and increase priority by 256 to
1814 * keep the received priority instead of reclassifying
1815 * the frame (see cfg80211_classify8021d).
1816 */
1817 xmit_skb->priority += 256;
f831e909 1818 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1819 skb_reset_network_header(xmit_skb);
1820 skb_reset_mac_header(xmit_skb);
76ee65bf 1821 dev_queue_xmit(xmit_skb);
571ecf67 1822 }
76ee65bf
RR		 1823}
1824
49461622 1825static ieee80211_rx_result debug_noinline
5cf121c3 1826ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1827{
eb9fb5b8 1828 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1829 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1831 __le16 fc = hdr->frame_control;
eaf85ca7 1832 struct sk_buff_head frame_list;
554891e6 1833 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1834
358c8d9d 1835 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1836 return RX_CONTINUE;
fd4c7f2f 1837
358c8d9d 1838 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1839 return RX_DROP_MONITOR;
fd4c7f2f 1840
554891e6 1841 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1842 return RX_CONTINUE;
fd4c7f2f 1843
eaf85ca7
ZY		 1844 if (ieee80211_has_a4(hdr->frame_control) &&
1845 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 !rx->sdata->u.vlan.sta)
e4c26add 1847 return RX_DROP_UNUSABLE;
fd4c7f2f 1848
eaf85ca7
ZY		 1849 if (is_multicast_ether_addr(hdr->addr1) &&
1850 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1851 rx->sdata->u.vlan.sta) ||
1852 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1853 rx->sdata->u.mgd.use_4addr)))
e4c26add 1854 return RX_DROP_UNUSABLE;
fd4c7f2f 1855
eaf85ca7
ZY		 1856 skb->dev = dev;
1857 __skb_queue_head_init(&frame_list);
fd4c7f2f 1858
e3cf8b3f
ZY		 1859 if (skb_linearize(skb))
1860 return RX_DROP_UNUSABLE;
1861
eaf85ca7
ZY		 1862 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1863 rx->sdata->vif.type,
8b3becad 1864 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1865
eaf85ca7
ZY		 1866 while (!skb_queue_empty(&frame_list)) {
1867 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1868
358c8d9d 1869 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1870 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1871 continue;
1872 }
eaf85ca7
ZY		 1873 dev->stats.rx_packets++;
1874 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1875
1876 ieee80211_deliver_skb(rx);
1877 }
1878
9ae54c84 1879 return RX_QUEUED;
fd4c7f2f
RR		 1880}
1881
bf94e17b 1882#ifdef CONFIG_MAC80211_MESH
b0dee578 1883static ieee80211_rx_result
e32f85f7
LCC		 1884ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1885{
30789eb6
TP		 1886 struct ieee80211_hdr *fwd_hdr, *hdr;
1887 struct ieee80211_tx_info *info;
e32f85f7 1888 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1889 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1890 struct ieee80211_local *local = rx->local;
eb9fb5b8 1891 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1893 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1894 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1895 u16 q, hdrlen;
e32f85f7
LCC		 1896
1897 hdr = (struct ieee80211_hdr *) skb->data;
1898 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1899 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1900
2157fdd6
TP		 1901 /* frame is in RMC, don't forward */
1902 if (ieee80211_is_data(hdr->frame_control) &&
1903 is_multicast_ether_addr(hdr->addr1) &&
1904 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1905 return RX_DROP_MONITOR;
1906
e32f85f7
LCC		 1907 if (!ieee80211_is_data(hdr->frame_control))
1908 return RX_CONTINUE;
1909
1910 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1911 return RX_DROP_MONITOR;
1912
43b7b314 1913 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1914 struct mesh_path *mppath;
43b7b314
JC		 1915 char *proxied_addr;
1916 char *mpp_addr;
1917
1918 if (is_multicast_ether_addr(hdr->addr1)) {
1919 mpp_addr = hdr->addr3;
1920 proxied_addr = mesh_hdr->eaddr1;
1921 } else {
1922 mpp_addr = hdr->addr4;
1923 proxied_addr = mesh_hdr->eaddr2;
1924 }
79617dee 1925
79617dee 1926 rcu_read_lock();
43b7b314 1927 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1928 if (!mppath) {
43b7b314 1929 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1930 } else {
1931 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1932 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1933 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1934 spin_unlock_bh(&mppath->state_lock);
1935 }
1936 rcu_read_unlock();
1937 }
1938
3c5772a5
JC		 1939 /* Frame has reached destination. Don't forward */
1940 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1941 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1942 return RX_CONTINUE;
1943
d3c1597b
TP		 1944 q = ieee80211_select_queue_80211(local, skb, hdr);
1945 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1946 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1947 return RX_DROP_MONITOR;
1948 }
1949 skb_set_queue_mapping(skb, q);
e32f85f7 1950
30789eb6
TP		 1951 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1952 goto out;
c8a61a7d 1953
30789eb6
TP		 1954 if (!--mesh_hdr->ttl) {
1955 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1956 return RX_DROP_MONITOR;
1957 }
1958
1959 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1960 if (!fwd_skb) {
1961 if (net_ratelimit())
1962 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1963 sdata->name);
1964 goto out;
1965 }
1966
1967 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1968 info = IEEE80211_SKB_CB(fwd_skb);
1969 memset(info, 0, sizeof(*info));
1970 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1971 info->control.vif = &rx->sdata->vif;
1972 info->control.jiffies = jiffies;
1973 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1974 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1975 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1976 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1978 } else {
1979 /* unable to resolve next hop */
1980 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1981 0, reason, fwd_hdr->addr2, sdata);
1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1983 kfree_skb(fwd_skb);
30789eb6 1984 return RX_DROP_MONITOR;
e32f85f7
LCC		 1985 }
1986
30789eb6
TP		 1987 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1988 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1989 out:
3c5772a5 1990 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1991 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1992 return RX_CONTINUE;
1993 else
1994 return RX_DROP_MONITOR;
1995}
bf94e17b 1996#endif
e32f85f7 1997
49461622 1998static ieee80211_rx_result debug_noinline
5cf121c3 1999ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2000{
eb9fb5b8 2001 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2002 struct ieee80211_local *local = rx->local;
eb9fb5b8 2003 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2004 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2005 __le16 fc = hdr->frame_control;
4114fa21 2006 bool port_control;
ce3edf6d 2007 int err;
76ee65bf 2008
358c8d9d 2009 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2010 return RX_CONTINUE;
76ee65bf 2011
358c8d9d 2012 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2013 return RX_DROP_MONITOR;
76ee65bf 2014
f14543ee 2015 /*
e7f4a940
JB		 2016 * Send unexpected-4addr-frame event to hostapd. For older versions,
2017 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2018 */
2019 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2020 sdata->vif.type == NL80211_IFTYPE_AP) {
2021 if (rx->sta &&
2022 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2023 cfg80211_rx_unexpected_4addr_frame(
2024 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2025 return RX_DROP_MONITOR;
e7f4a940 2026 }
f14543ee 2027
4114fa21 2028 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2029 if (unlikely(err))
e4c26add 2030 return RX_DROP_UNUSABLE;
76ee65bf 2031
358c8d9d 2032 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2033 return RX_DROP_MONITOR;
ce3edf6d 2034
4114fa21
FF		 2035 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2036 unlikely(port_control) && sdata->bss) {
2037 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2038 u.ap);
2039 dev = sdata->dev;
2040 rx->sdata = sdata;
2041 }
2042
76ee65bf
RR		 2043 rx->skb->dev = dev;
2044
2045 dev->stats.rx_packets++;
2046 dev->stats.rx_bytes += rx->skb->len;
2047
08ca944e 2048 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2049 !is_multicast_ether_addr(
2050 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2051 (!local->scanning &&
2052 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2053 mod_timer(&local->dynamic_ps_timer, jiffies +
2054 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2055 }
2056
76ee65bf 2057 ieee80211_deliver_skb(rx);
571ecf67 2058
9ae54c84 2059 return RX_QUEUED;
571ecf67
JB		 2060}
2061
49461622 2062static ieee80211_rx_result debug_noinline
24a8fdad 2063ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2064{
2065 struct ieee80211_local *local = rx->local;
2066 struct ieee80211_hw *hw = &local->hw;
2067 struct sk_buff *skb = rx->skb;
a7767f95 2068 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2069 struct tid_ampdu_rx *tid_agg_rx;
2070 u16 start_seq_num;
2071 u16 tid;
2072
a7767f95 2073 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2074 return RX_CONTINUE;
71364716 2075
a7767f95 2076 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2077 struct {
2078 __le16 control, start_seq_num;
2079 } __packed bar_data;
2080
71364716 2081 if (!rx->sta)
a02ae758 2082 return RX_DROP_MONITOR;
8ae5977f
JB		 2083
2084 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2085 &bar_data, sizeof(bar_data)))
2086 return RX_DROP_MONITOR;
2087
8ae5977f 2088 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2089
2090 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2091 if (!tid_agg_rx)
a02ae758 2092 return RX_DROP_MONITOR;
71364716 2093
8ae5977f 2094 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2095
2096 /* reset session timer */
20ad19d0
JB		 2097 if (tid_agg_rx->timeout)
2098 mod_timer(&tid_agg_rx->session_timer,
2099 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2100
dd318575 2101 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2102 /* release stored frames up to start of BAR */
24a8fdad 2103 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2104 spin_unlock(&tid_agg_rx->reorder_lock);
2105
a02ae758
JB		 2106 kfree_skb(skb);
2107 return RX_QUEUED;
71364716
RR		 2108 }
2109
08daecae
JB		 2110 /*
2111 * After this point, we only want management frames,
2112 * so we can drop all remaining control frames to
2113 * cooked monitor interfaces.
2114 */
2115 return RX_DROP_MONITOR;
71364716
RR		 2116}
2117
f4f727a6
JM		 2118static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2119 struct ieee80211_mgmt *mgmt,
2120 size_t len)
fea14732
JM		 2121{
2122 struct ieee80211_local *local = sdata->local;
2123 struct sk_buff *skb;
2124 struct ieee80211_mgmt *resp;
2125
47846c9b 2126 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2127 /* Not to own unicast address */
2128 return;
2129 }
2130
46900298
JB		 2131 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2132 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2133 /* Not from the current AP or not associated yet. */
fea14732
JM		 2134 return;
2135 }
2136
2137 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2138 /* Too short SA Query request frame */
2139 return;
2140 }
2141
2142 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2143 if (skb == NULL)
2144 return;
2145
2146 skb_reserve(skb, local->hw.extra_tx_headroom);
2147 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2148 memset(resp, 0, 24);
2149 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2150 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2151 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2152 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2153 IEEE80211_STYPE_ACTION);
2154 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2155 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2156 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2157 memcpy(resp->u.action.u.sa_query.trans_id,
2158 mgmt->u.action.u.sa_query.trans_id,
2159 WLAN_SA_QUERY_TR_ID_LEN);
2160
62ae67be 2161 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2162}
2163
2e161f78
JB		 2164static ieee80211_rx_result debug_noinline
2165ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2166{
2167 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2168 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2169
2170 /*
2171 * From here on, look only at management frames.
2172 * Data and control frames are already handled,
2173 * and unknown (reserved) frames are useless.
2174 */
2175 if (rx->skb->len < 24)
2176 return RX_DROP_MONITOR;
2177
2178 if (!ieee80211_is_mgmt(mgmt->frame_control))
2179 return RX_DROP_MONITOR;
2180
ee971924
JB		 2181 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2182 ieee80211_is_beacon(mgmt->frame_control) &&
2183 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
ee971924
JB		 2184 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2185 rx->skb->data, rx->skb->len,
2186 status->freq, GFP_ATOMIC);
2187 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2188 }
2189
554891e6 2190 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2191 return RX_DROP_MONITOR;
2192
2193 if (ieee80211_drop_unencrypted_mgmt(rx))
2194 return RX_DROP_UNUSABLE;
2195
2196 return RX_CONTINUE;
2197}
2198
de1ede7a
JB		 2199static ieee80211_rx_result debug_noinline
2200ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2201{
2202 struct ieee80211_local *local = rx->local;
eb9fb5b8 2203 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2204 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2205 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2206 int len = rx->skb->len;
2207
2208 if (!ieee80211_is_action(mgmt->frame_control))
2209 return RX_CONTINUE;
2210
026331c4
JM		 2211 /* drop too small frames */
2212 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2213 return RX_DROP_UNUSABLE;
de1ede7a 2214
026331c4 2215 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2216 return RX_DROP_UNUSABLE;
de1ede7a 2217
554891e6 2218 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2219 return RX_DROP_UNUSABLE;
97ebe12a 2220
de1ede7a 2221 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2222 case WLAN_CATEGORY_HT:
2223 /* reject HT action frames from stations not supporting HT */
2224 if (!rx->sta->sta.ht_cap.ht_supported)
2225 goto invalid;
2226
2227 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2228 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2229 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2230 sdata->vif.type != NL80211_IFTYPE_AP &&
2231 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2232 break;
2233
2234 /* verify action & smps_control are present */
2235 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2236 goto invalid;
2237
2238 switch (mgmt->u.action.u.ht_smps.action) {
2239 case WLAN_HT_ACTION_SMPS: {
2240 struct ieee80211_supported_band *sband;
2241 u8 smps;
2242
2243 /* convert to HT capability */
2244 switch (mgmt->u.action.u.ht_smps.smps_control) {
2245 case WLAN_HT_SMPS_CONTROL_DISABLED:
2246 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2247 break;
2248 case WLAN_HT_SMPS_CONTROL_STATIC:
2249 smps = WLAN_HT_CAP_SM_PS_STATIC;
2250 break;
2251 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2252 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2253 break;
2254 default:
2255 goto invalid;
2256 }
2257 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2258
2259 /* if no change do nothing */
2260 if ((rx->sta->sta.ht_cap.cap &
2261 IEEE80211_HT_CAP_SM_PS) == smps)
2262 goto handled;
2263
2264 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2265 rx->sta->sta.ht_cap.cap |= smps;
2266
2267 sband = rx->local->hw.wiphy->bands[status->band];
2268
2269 rate_control_rate_update(local, sband, rx->sta,
2270 IEEE80211_RC_SMPS_CHANGED,
2271 local->_oper_channel_type);
2272 goto handled;
2273 }
2274 default:
2275 goto invalid;
2276 }
2277
2278 break;
de1ede7a 2279 case WLAN_CATEGORY_BACK:
8abd3f9b 2280 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2281 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2282 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2283 sdata->vif.type != NL80211_IFTYPE_AP &&
2284 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2285 break;
8abd3f9b 2286
026331c4
JM		 2287 /* verify action_code is present */
2288 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2289 break;
2290
de1ede7a
JB		 2291 switch (mgmt->u.action.u.addba_req.action_code) {
2292 case WLAN_ACTION_ADDBA_REQ:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2295 goto invalid;
2296 break;
de1ede7a
JB		 2297 case WLAN_ACTION_ADDBA_RESP:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2300 goto invalid;
2301 break;
de1ede7a
JB		 2302 case WLAN_ACTION_DELBA:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2305 goto invalid;
2306 break;
2307 default:
2308 goto invalid;
de1ede7a 2309 }
bed7ee6e 2310
8b58ff83 2311 goto queue;
39192c0b
JB		 2312 case WLAN_CATEGORY_SPECTRUM_MGMT:
2313 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2314 break;
46900298
JB		 2315
2316 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2317 break;
46900298 2318
026331c4
JM		 2319 /* verify action_code is present */
2320 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2321 break;
2322
39192c0b
JB		 2323 switch (mgmt->u.action.u.measurement.action_code) {
2324 case WLAN_ACTION_SPCT_MSR_REQ:
2325 if (len < (IEEE80211_MIN_ACTION_SIZE +
2326 sizeof(mgmt->u.action.u.measurement)))
84040805 2327 break;
39192c0b 2328 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2329 goto handled;
c481ec97
S		 2330 case WLAN_ACTION_SPCT_CHL_SWITCH:
2331 if (len < (IEEE80211_MIN_ACTION_SIZE +
2332 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2333 break;
c481ec97 2334
cc32abd4 2335 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2336 break;
cc32abd4 2337
46900298 2338 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2339 break;
c481ec97 2340
8b58ff83 2341 goto queue;
39192c0b
JB		 2342 }
2343 break;
fea14732
JM		 2344 case WLAN_CATEGORY_SA_QUERY:
2345 if (len < (IEEE80211_MIN_ACTION_SIZE +
2346 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2347 break;
2348
fea14732
JM		 2349 switch (mgmt->u.action.u.sa_query.action) {
2350 case WLAN_ACTION_SA_QUERY_REQUEST:
2351 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2352 break;
fea14732 2353 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2354 goto handled;
fea14732
JM		 2355 }
2356 break;
8db09850
TP		 2357 case WLAN_CATEGORY_SELF_PROTECTED:
2358 switch (mgmt->u.action.u.self_prot.action_code) {
2359 case WLAN_SP_MESH_PEERING_OPEN:
2360 case WLAN_SP_MESH_PEERING_CLOSE:
2361 case WLAN_SP_MESH_PEERING_CONFIRM:
2362 if (!ieee80211_vif_is_mesh(&sdata->vif))
2363 goto invalid;
2364 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2365 /* userspace handles this frame */
2366 break;
2367 goto queue;
2368 case WLAN_SP_MGK_INFORM:
2369 case WLAN_SP_MGK_ACK:
2370 if (!ieee80211_vif_is_mesh(&sdata->vif))
2371 goto invalid;
2372 break;
2373 }
2374 break;
d3aaec8a 2375 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2376 if (!ieee80211_vif_is_mesh(&sdata->vif))
2377 break;
25d49e4d
TP		 2378 if (mesh_action_is_path_sel(mgmt) &&
2379 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2380 break;
2381 goto queue;
84040805 2382 }
026331c4 2383
2e161f78
JB		 2384 return RX_CONTINUE;
2385
bed7ee6e 2386 invalid:
554891e6 2387 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2388 /* will return in the next handlers */
2389 return RX_CONTINUE;
2390
2391 handled:
2392 if (rx->sta)
2393 rx->sta->rx_packets++;
2394 dev_kfree_skb(rx->skb);
2395 return RX_QUEUED;
2396
2397 queue:
2398 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2399 skb_queue_tail(&sdata->skb_queue, rx->skb);
2400 ieee80211_queue_work(&local->hw, &sdata->work);
2401 if (rx->sta)
2402 rx->sta->rx_packets++;
2403 return RX_QUEUED;
2404}
2405
2406static ieee80211_rx_result debug_noinline
2407ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2408{
554891e6 2409 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2410
2411 /* skip known-bad action frames and return them in the next handler */
554891e6 2412 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2413 return RX_CONTINUE;
d7907448 2414
026331c4
JM		 2415 /*
2416 * Getting here means the kernel doesn't know how to handle
2417 * it, but maybe userspace does ... include returned frames
2418 * so userspace can register for those to know whether ones
2419 * it transmitted were processed or returned.
2420 */
026331c4 2421
2e161f78
JB		 2422 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2423 rx->skb->data, rx->skb->len,
2424 GFP_ATOMIC)) {
2425 if (rx->sta)
2426 rx->sta->rx_packets++;
2427 dev_kfree_skb(rx->skb);
2428 return RX_QUEUED;
2429 }
2430
2431
2432 return RX_CONTINUE;
2433}
2434
2435static ieee80211_rx_result debug_noinline
2436ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2437{
2438 struct ieee80211_local *local = rx->local;
2439 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2440 struct sk_buff *nskb;
2441 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2442 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2443
2444 if (!ieee80211_is_action(mgmt->frame_control))
2445 return RX_CONTINUE;
2446
2447 /*
2448 * For AP mode, hostapd is responsible for handling any action
2449 * frames that we didn't handle, including returning unknown
2450 * ones. For all other modes we will return them to the sender,
2451 * setting the 0x80 bit in the action category, as required by
2452 * 802.11-2007 7.3.1.11.
2453 * Newer versions of hostapd shall also use the management frame
2454 * registration mechanisms, but older ones still use cooked
2455 * monitor interfaces so push all frames there.
2456 */
554891e6 2457 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2458 (sdata->vif.type == NL80211_IFTYPE_AP ||
2459 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2460 return RX_DROP_MONITOR;
026331c4 2461
84040805
JB		 2462 /* do not return rejected action frames */
2463 if (mgmt->u.action.category & 0x80)
2464 return RX_DROP_UNUSABLE;
2465
2466 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2467 GFP_ATOMIC);
2468 if (nskb) {
292b4df6 2469 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2470
292b4df6
JL		 2471 nmgmt->u.action.category |= 0x80;
2472 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2473 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2474
2475 memset(nskb->cb, 0, sizeof(nskb->cb));
2476
2477 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2478 }
39192c0b
JB		 2479 dev_kfree_skb(rx->skb);
2480 return RX_QUEUED;
de1ede7a
JB		 2481}
2482
49461622 2483static ieee80211_rx_result debug_noinline
5cf121c3 2484ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2485{
eb9fb5b8 2486 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2487 ieee80211_rx_result rxs;
77a121c3
JB		 2488 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2489 __le16 stype;
571ecf67 2490
af6b6374
JB		 2491 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2492 if (rxs != RX_CONTINUE)
2493 return rxs;
2494
77a121c3 2495 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2496
77a121c3
JB		 2497 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2498 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2499 sdata->vif.type != NL80211_IFTYPE_STATION)
2500 return RX_DROP_MONITOR;
472dbc45 2501
77a121c3
JB		 2502 switch (stype) {
2503 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2504 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2505 /* process for all: mesh, mlme, ibss */
2506 break;
2507 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2508 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2509 if (is_multicast_ether_addr(mgmt->da) &&
2510 !is_broadcast_ether_addr(mgmt->da))
2511 return RX_DROP_MONITOR;
2512
77a121c3
JB		 2513 /* process only for station */
2514 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2515 return RX_DROP_MONITOR;
2516 break;
2517 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2518 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2519 /* process only for ibss */
2520 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2521 return RX_DROP_MONITOR;
2522 break;
2523 default:
2524 return RX_DROP_MONITOR;
2525 }
f9d540ee 2526
77a121c3 2527 /* queue up frame and kick off work to process it */
c1475ca9 2528 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2529 skb_queue_tail(&sdata->skb_queue, rx->skb);
2530 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2531 if (rx->sta)
2532 rx->sta->rx_packets++;
46900298 2533
77a121c3 2534 return RX_QUEUED;
571ecf67
JB		 2535}
2536
5cf121c3 2537/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2538static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2539 struct ieee80211_rate *rate)
3d30d949
MW		 2540{
2541 struct ieee80211_sub_if_data *sdata;
2542 struct ieee80211_local *local = rx->local;
2543 struct ieee80211_rtap_hdr {
2544 struct ieee80211_radiotap_header hdr;
2545 u8 flags;
5f0b7de5 2546 u8 rate_or_pad;
3d30d949
MW		 2547 __le16 chan_freq;
2548 __le16 chan_flags;
bc10502d 2549 } __packed *rthdr;
3d30d949
MW		 2550 struct sk_buff *skb = rx->skb, *skb2;
2551 struct net_device *prev_dev = NULL;
eb9fb5b8 2552 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2553
554891e6
JB		 2554 /*
2555 * If cooked monitor has been processed already, then
2556 * don't do it again. If not, set the flag.
2557 */
2558 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2559 goto out_free_skb;
554891e6 2560 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2561
152c477a
JB		 2562 /* If there are no cooked monitor interfaces, just free the SKB */
2563 if (!local->cooked_mntrs)
2564 goto out_free_skb;
2565
3d30d949
MW		 2566 if (skb_headroom(skb) < sizeof(*rthdr) &&
2567 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2568 goto out_free_skb;
2569
2570 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2571 memset(rthdr, 0, sizeof(*rthdr));
2572 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2573 rthdr->hdr.it_present =
2574 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2575 (1 << IEEE80211_RADIOTAP_CHANNEL));
2576
5f0b7de5
JB		 2577 if (rate) {
2578 rthdr->rate_or_pad = rate->bitrate / 5;
2579 rthdr->hdr.it_present |=
2580 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2581 }
3d30d949
MW		 2582 rthdr->chan_freq = cpu_to_le16(status->freq);
2583
2584 if (status->band == IEEE80211_BAND_5GHZ)
2585 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2586 IEEE80211_CHAN_5GHZ);
2587 else
2588 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2589 IEEE80211_CHAN_2GHZ);
2590
2591 skb_set_mac_header(skb, 0);
2592 skb->ip_summed = CHECKSUM_UNNECESSARY;
2593 skb->pkt_type = PACKET_OTHERHOST;
2594 skb->protocol = htons(ETH_P_802_2);
2595
2596 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2597 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2598 continue;
2599
05c914fe 2600 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2601 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2602 continue;
2603
2604 if (prev_dev) {
2605 skb2 = skb_clone(skb, GFP_ATOMIC);
2606 if (skb2) {
2607 skb2->dev = prev_dev;
5548a8a1 2608 netif_receive_skb(skb2);
3d30d949
MW		 2609 }
2610 }
2611
2612 prev_dev = sdata->dev;
2613 sdata->dev->stats.rx_packets++;
2614 sdata->dev->stats.rx_bytes += skb->len;
2615 }
2616
2617 if (prev_dev) {
2618 skb->dev = prev_dev;
5548a8a1 2619 netif_receive_skb(skb);
554891e6
JB		 2620 return;
2621 }
3d30d949
MW		 2622
2623 out_free_skb:
2624 dev_kfree_skb(skb);
2625}
2626
aa0c8636
CL		 2627static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2628 ieee80211_rx_result res)
2629{
2630 switch (res) {
2631 case RX_DROP_MONITOR:
2632 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2633 if (rx->sta)
2634 rx->sta->rx_dropped++;
2635 /* fall through */
2636 case RX_CONTINUE: {
2637 struct ieee80211_rate *rate = NULL;
2638 struct ieee80211_supported_band *sband;
2639 struct ieee80211_rx_status *status;
2640
2641 status = IEEE80211_SKB_RXCB((rx->skb));
2642
2643 sband = rx->local->hw.wiphy->bands[status->band];
2644 if (!(status->flag & RX_FLAG_HT))
2645 rate = &sband->bitrates[status->rate_idx];
2646
2647 ieee80211_rx_cooked_monitor(rx, rate);
2648 break;
2649 }
2650 case RX_DROP_UNUSABLE:
2651 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2652 if (rx->sta)
2653 rx->sta->rx_dropped++;
2654 dev_kfree_skb(rx->skb);
2655 break;
2656 case RX_QUEUED:
2657 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2658 break;
2659 }
2660}
571ecf67 2661
24a8fdad 2662static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2663{
58905290 2664 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2665 struct sk_buff *skb;
8944b79f 2666
e32f85f7
LCC		 2667#define CALL_RXH(rxh) \
2668 do { \
2669 res = rxh(rx); \
2670 if (res != RX_CONTINUE) \
2569a826 2671 goto rxh_next; \
e32f85f7 2672 } while (0);
49461622 2673
24a8fdad
CL		 2674 spin_lock(&rx->local->rx_skb_queue.lock);
2675 if (rx->local->running_rx_handler)
2676 goto unlock;
2677
2678 rx->local->running_rx_handler = true;
2679
2680 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2681 spin_unlock(&rx->local->rx_skb_queue.lock);
2682
2569a826
JB		 2683 /*
2684 * all the other fields are valid across frames
2685 * that belong to an aMPDU since they are on the
2686 * same TID from the same station
2687 */
2688 rx->skb = skb;
2689
2690 CALL_RXH(ieee80211_rx_h_decrypt)
2691 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2692 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2693 CALL_RXH(ieee80211_rx_h_sta_process)
2694 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2695 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2696 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2697#ifdef CONFIG_MAC80211_MESH
aa0c8636 2698 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2699 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2700#endif
2154c81c 2701 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2702 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2703 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2704 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2705 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2706 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2707 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2708 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2709
aa0c8636
CL		 2710 rxh_next:
2711 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2712 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2713#undef CALL_RXH
aa0c8636 2714 }
24a8fdad
CL		 2715
2716 rx->local->running_rx_handler = false;
2717
2718 unlock:
2719 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2720}
2721
4406c376 2722static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2723{
aa0c8636
CL		 2724 ieee80211_rx_result res = RX_DROP_MONITOR;
2725
aa0c8636
CL		 2726#define CALL_RXH(rxh) \
2727 do { \
2728 res = rxh(rx); \
2729 if (res != RX_CONTINUE) \
2730 goto rxh_next; \
2731 } while (0);
2732
2733 CALL_RXH(ieee80211_rx_h_passive_scan)
2734 CALL_RXH(ieee80211_rx_h_check)
2735
24a8fdad 2736 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2737
24a8fdad 2738 ieee80211_rx_handlers(rx);
aa0c8636 2739 return;
49461622 2740
2569a826 2741 rxh_next:
aa0c8636
CL		 2742 ieee80211_rx_handlers_result(rx, res);
2743
2744#undef CALL_RXH
58905290
JB		 2745}
2746
2bff8ebf 2747/*
dd318575
JB		 2748 * This function makes calls into the RX path, therefore
2749 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2750 */
2751void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2752{
554891e6
JB		 2753 struct ieee80211_rx_data rx = {
2754 .sta = sta,
2755 .sdata = sta->sdata,
2756 .local = sta->local,
9e26297a
JB		 2757 /* This is OK -- must be QoS data frame */
2758 .security_idx = tid,
2759 .seqno_idx = tid,
fcf8bd3b 2760 .flags = 0,
554891e6 2761 };
2c15a0cf
CL		 2762 struct tid_ampdu_rx *tid_agg_rx;
2763
2764 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2765 if (!tid_agg_rx)
2766 return;
2bff8ebf 2767
2c15a0cf 2768 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2769 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2770 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2771
24a8fdad 2772 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2773}
2774
571ecf67
JB		 2775/* main receive path */
2776
20b01f80 2777static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2778 struct ieee80211_hdr *hdr)
2779{
20b01f80 2780 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2781 struct sk_buff *skb = rx->skb;
2782 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2783 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2784 int multicast = is_multicast_ether_addr(hdr->addr1);
2785
51fb61e7 2786 switch (sdata->vif.type) {
05c914fe 2787 case NL80211_IFTYPE_STATION:
9bc383de 2788 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2789 return 0;
77fdaa12 2790 if (!multicast &&
47846c9b 2791 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2792 if (!(sdata->dev->flags & IFF_PROMISC) ||
2793 sdata->u.mgd.use_4addr)
23a24def 2794 return 0;
554891e6 2795 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2796 }
2797 break;
05c914fe 2798 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2799 if (!bssid)
2800 return 0;
a7767f95 2801 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2802 return 1;
87291c02 2803 }
46900298 2804 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2805 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2806 return 0;
554891e6 2807 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2808 } else if (!multicast &&
47846c9b 2809 compare_ether_addr(sdata->vif.addr,
23a24def 2810 hdr->addr1) != 0) {
4150c572 2811 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2812 return 0;
554891e6 2813 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2814 } else if (!rx->sta) {
2815 int rate_idx;
eb9fb5b8 2816 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2817 rate_idx = 0; /* TODO: HT rates */
2818 else
eb9fb5b8 2819 rate_idx = status->rate_idx;
8bf11d8d
JB		 2820 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2821 BIT(rate_idx));
0fb8ca45 2822 }
23a24def 2823 break;
05c914fe 2824 case NL80211_IFTYPE_MESH_POINT:
6032f934 2825 if (!multicast &&
47846c9b 2826 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2827 hdr->addr1) != 0) {
2828 if (!(sdata->dev->flags & IFF_PROMISC))
2829 return 0;
2830
554891e6 2831 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2832 }
2833 break;
05c914fe
JB		 2834 case NL80211_IFTYPE_AP_VLAN:
2835 case NL80211_IFTYPE_AP:
23a24def 2836 if (!bssid) {
47846c9b 2837 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2838 hdr->addr1))
2839 return 0;
2840 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2841 sdata->vif.addr)) {
3df6eaea
JB		 2842 /*
2843 * Accept public action frames even when the
2844 * BSSID doesn't match, this is used for P2P
2845 * and location updates. Note that mac80211
2846 * itself never looks at these frames.
2847 */
2848 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2849 ieee80211_is_public_action(hdr, skb->len))
2850 return 1;
771bbd09 2851 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
3df6eaea 2852 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2853 return 0;
554891e6 2854 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2855 }
23a24def 2856 break;
05c914fe 2857 case NL80211_IFTYPE_WDS:
a7767f95 2858 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2859 return 0;
2860 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2861 return 0;
2862 break;
2ca27bcf 2863 default:
fb1c1cd6
JB		 2864 /* should never get here */
2865 WARN_ON(1);
2866 break;
23a24def
JB		 2867 }
2868
2869 return 1;
2870}
2871
4406c376
JB		 2872/*
2873 * This function returns whether or not the SKB
2874 * was destined for RX processing or not, which,
2875 * if consume is true, is equivalent to whether
2876 * or not the skb was consumed.
2877 */
2878static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2879 struct sk_buff *skb, bool consume)
2880{
2881 struct ieee80211_local *local = rx->local;
2882 struct ieee80211_sub_if_data *sdata = rx->sdata;
2883 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2884 struct ieee80211_hdr *hdr = (void *)skb->data;
2885 int prepares;
2886
2887 rx->skb = skb;
554891e6 2888 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2889 prepares = prepare_for_handlers(rx, hdr);
2890
2891 if (!prepares)
2892 return false;
2893
4406c376
JB		 2894 if (!consume) {
2895 skb = skb_copy(skb, GFP_ATOMIC);
2896 if (!skb) {
2897 if (net_ratelimit())
2898 wiphy_debug(local->hw.wiphy,
b305dae4 2899 "failed to copy skb for %s\n",
4406c376
JB		 2900 sdata->name);
2901 return true;
2902 }
2903
2904 rx->skb = skb;
2905 }
2906
2907 ieee80211_invoke_rx_handlers(rx);
2908 return true;
2909}
2910
571ecf67 2911/*
6368e4b1
RR		 2912 * This is the actual Rx frames handler. as it blongs to Rx path it must
2913 * be called with rcu_read_lock protection.
571ecf67 2914 */
71ebb4aa 2915static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2916 struct sk_buff *skb)
571ecf67 2917{
554891e6 2918 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2919 struct ieee80211_local *local = hw_to_local(hw);
2920 struct ieee80211_sub_if_data *sdata;
571ecf67 2921 struct ieee80211_hdr *hdr;
e3cf8b3f 2922 __le16 fc;
5cf121c3 2923 struct ieee80211_rx_data rx;
4406c376 2924 struct ieee80211_sub_if_data *prev;
56af3268 2925 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2926 int err = 0;
571ecf67 2927
e3cf8b3f 2928 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2929 memset(&rx, 0, sizeof(rx));
2930 rx.skb = skb;
2931 rx.local = local;
72abd81b 2932
e3cf8b3f 2933 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2934 local->dot11ReceivedFragmentCount++;
571ecf67 2935
142b9f50 2936 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2937 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2938 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2939
e3cf8b3f
ZY		 2940 if (ieee80211_is_mgmt(fc))
2941 err = skb_linearize(skb);
2942 else
2943 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2944
2945 if (err) {
2946 dev_kfree_skb(skb);
2947 return;
2948 }
2949
2950 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2951 ieee80211_parse_qos(&rx);
d1c3a37c 2952 ieee80211_verify_alignment(&rx);
38f3714d 2953
e3cf8b3f 2954 if (ieee80211_is_data(fc)) {
56af3268 2955 prev_sta = NULL;
4406c376 2956
7852e361 2957 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2958 if (!prev_sta) {
2959 prev_sta = sta;
2960 continue;
2961 }
2962
2963 rx.sta = prev_sta;
2964 rx.sdata = prev_sta->sdata;
4406c376 2965 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2966
56af3268 2967 prev_sta = sta;
4406c376 2968 }
56af3268
BG		 2969
2970 if (prev_sta) {
2971 rx.sta = prev_sta;
2972 rx.sdata = prev_sta->sdata;
2973
4406c376 2974 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2975 return;
8e26d5ad 2976 goto out;
56af3268 2977 }
4406c376
JB		 2978 }
2979
4b0dd98e 2980 prev = NULL;
b2e7771e 2981
4b0dd98e
JB		 2982 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2983 if (!ieee80211_sdata_running(sdata))
2984 continue;
340e11f3 2985
4b0dd98e
JB		 2986 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2987 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2988 continue;
340e11f3 2989
4b0dd98e
JB		 2990 /*
2991 * frame is destined for this interface, but if it's
2992 * not also for the previous one we handle that after
2993 * the loop to avoid copying the SKB once too much
2994 */
4bb29f8c 2995
4b0dd98e 2996 if (!prev) {
abe60632 2997 prev = sdata;
4b0dd98e 2998 continue;
340e11f3 2999 }
4bb29f8c 3000
7852e361 3001 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3002 rx.sdata = prev;
3003 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3004
4b0dd98e
JB		 3005 prev = sdata;
3006 }
3007
3008 if (prev) {
7852e361 3009 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3010 rx.sdata = prev;
4406c376 3011
4b0dd98e
JB		 3012 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3013 return;
571ecf67 3014 }
4406c376 3015
8e26d5ad 3016 out:
4406c376 3017 dev_kfree_skb(skb);
571ecf67 3018}
6368e4b1
RR		 3019
3020/*
3021 * This is the receive path handler. It is called by a low level driver when an
3022 * 802.11 MPDU is received from the hardware.
3023 */
103bf9f7 3024void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3025{
3026 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3027 struct ieee80211_rate *rate = NULL;
3028 struct ieee80211_supported_band *sband;
f1d58c25 3029 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3030
d20ef63d
JB		 3031 WARN_ON_ONCE(softirq_count() == 0);
3032
77a980dc
JB		 3033 if (WARN_ON(status->band < 0 ||
3034 status->band >= IEEE80211_NUM_BANDS))
3035 goto drop;
8318d78a
JB		 3036
3037 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3038 if (WARN_ON(!sband))
3039 goto drop;
8318d78a 3040
89c3a8ac
JB		 3041 /*
3042 * If we're suspending, it is possible although not too likely
3043 * that we'd be receiving frames after having already partially
3044 * quiesced the stack. We can't process such frames then since
3045 * that might, for example, cause stations to be added or other
3046 * driver callbacks be invoked.
3047 */
77a980dc
JB		 3048 if (unlikely(local->quiescing || local->suspended))
3049 goto drop;
89c3a8ac 3050
ea77f12f
JB		 3051 /*
3052 * The same happens when we're not even started,
3053 * but that's worth a warning.
3054 */
77a980dc
JB		 3055 if (WARN_ON(!local->started))
3056 goto drop;
ea77f12f 3057
fc885189 3058 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3059 /*
fc885189
JB		 3060 * Validate the rate, unless a PLCP error means that
3061 * we probably can't have a valid rate here anyway.
e5d6eb83 3062 */
fc885189
JB		 3063
3064 if (status->flag & RX_FLAG_HT) {
3065 /*
3066 * rate_idx is MCS index, which can be [0-76]
3067 * as documented on:
3068 *
3069 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3070 *
3071 * Anything else would be some sort of driver or
3072 * hardware error. The driver should catch hardware
3073 * errors.
3074 */
3075 if (WARN((status->rate_idx < 0 ||
3076 status->rate_idx > 76),
3077 "Rate marked as an HT rate but passed "
3078 "status->rate_idx is not "
3079 "an MCS index [0-76]: %d (0x%02x)\n",
3080 status->rate_idx,
3081 status->rate_idx))
3082 goto drop;
3083 } else {
3084 if (WARN_ON(status->rate_idx < 0 ||
3085 status->rate_idx >= sband->n_bitrates))
3086 goto drop;
3087 rate = &sband->bitrates[status->rate_idx];
3088 }
0fb8ca45 3089 }
6368e4b1 3090
554891e6
JB		 3091 status->rx_flags = 0;
3092
6368e4b1
RR		 3093 /*
3094 * key references and virtual interfaces are protected using RCU
3095 * and this requires that we are in a read-side RCU section during
3096 * receive processing
3097 */
3098 rcu_read_lock();
3099
3100 /*
3101 * Frames with failed FCS/PLCP checksum are not returned,
3102 * all other frames are returned without radiotap header
3103 * if it was previously present.
3104 * Also, frames with less than 16 bytes are dropped.
3105 */
f1d58c25 3106 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3107 if (!skb) {
3108 rcu_read_unlock();
3109 return;
3110 }
3111
e1e54068
JB		 3112 ieee80211_tpt_led_trig_rx(local,
3113 ((struct ieee80211_hdr *)skb->data)->frame_control,
3114 skb->len);
071d9ac2 3115 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3116
3117 rcu_read_unlock();
77a980dc
JB		 3118
3119 return;
3120 drop:
3121 kfree_skb(skb);
6368e4b1 3122}
103bf9f7 3123EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3124
3125/* This is a version of the rx handler that can be called from hard irq
3126 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3127void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3128{
3129 struct ieee80211_local *local = hw_to_local(hw);
3130
3131 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3132
571ecf67
JB		 3133 skb->pkt_type = IEEE80211_RX_MSG;
3134 skb_queue_tail(&local->skb_queue, skb);
3135 tasklet_schedule(&local->tasklet);
3136}
3137EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)