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mac80211: implement sta_add/sta_remove in sta_state
[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)))) {
2a33bee2
GE		 862 if (rx->sta && rx->sta->dummy &&
863 ieee80211_is_data_present(hdr->frame_control)) {
864 u16 ethertype;
865 u8 *payload;
866
867 payload = rx->skb->data +
868 ieee80211_hdrlen(hdr->frame_control);
869 ethertype = (payload[6] << 8) | payload[7];
870 if (cpu_to_be16(ethertype) ==
871 rx->sdata->control_port_protocol)
872 return RX_CONTINUE;
873 }
21fc7560
JB		 874
875 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
876 cfg80211_rx_spurious_frame(rx->sdata->dev,
877 hdr->addr2,
878 GFP_ATOMIC))
879 return RX_DROP_UNUSABLE;
880
e4c26add 881 return RX_DROP_MONITOR;
2a33bee2 882 }
571ecf67 883
9ae54c84 884 return RX_CONTINUE;
570bd537
JB		 885}
886
887
49461622 888static ieee80211_rx_result debug_noinline
5cf121c3 889ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 890{
eb9fb5b8
JB		 891 struct sk_buff *skb = rx->skb;
892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
893 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 894 int keyidx;
895 int hdrlen;
e4c26add 896 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 897 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 898 int mmie_keyidx = -1;
761ab470 899 __le16 fc;
570bd537 900
3017b80b
JB		 901 /*
902 * Key selection 101
903 *
3cfcf6ac 904 * There are four types of keys:
3017b80b 905 * - GTK (group keys)
3cfcf6ac 906 * - IGTK (group keys for management frames)
3017b80b
JB		 907 * - PTK (pairwise keys)
908 * - STK (station-to-station pairwise keys)
909 *
910 * When selecting a key, we have to distinguish between multicast
911 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 912 * use PTKs and STKs while the former always use GTKs and IGTKs.
913 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
914 * unicast frames can also use key indices like GTKs. Hence, if we
915 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 916 *
8dc06a1c
JB		 917 * Note that in a regular BSS, multicast frames are sent by the
918 * AP only, associated stations unicast the frame to the AP first
919 * which then multicasts it on their behalf.
920 *
3017b80b
JB		 921 * There is also a slight problem in IBSS mode: GTKs are negotiated
922 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 923 * The spec seems to expect that one negotiates the same key with
924 * every station but there's no such requirement; VLANs could be
925 * possible.
3017b80b
JB		 926 */
927
3017b80b 928 /*
1990af8d 929 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 930 * addressed to us nor a multicast frame.
931 */
554891e6 932 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 933 return RX_CONTINUE;
3017b80b 934
2569a826
JB		 935 /* start without a key */
936 rx->key = NULL;
937
d4e46a3d 938 if (rx->sta)
e31b8213 939 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 940
761ab470
JB		 941 fc = hdr->frame_control;
942
943 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 944 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
945
e31b8213
JB		 946 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
947 rx->key = sta_ptk;
dc1580dd
JB		 948 if ((status->flag & RX_FLAG_DECRYPTED) &&
949 (status->flag & RX_FLAG_IV_STRIPPED))
950 return RX_CONTINUE;
0c7c10c7 951 /* Skip decryption if the frame is not protected. */
761ab470 952 if (!ieee80211_has_protected(fc))
0c7c10c7 953 return RX_CONTINUE;
3cfcf6ac
JM		 954 } else if (mmie_keyidx >= 0) {
955 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 958 return RX_CONTINUE;
959
960 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
961 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
962 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 963 if (rx->sta)
964 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
965 if (!rx->key)
966 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 967 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 968 /*
969 * The frame was not protected, so skip decryption. However, we
970 * need to set rx->key if there is a key that could have been
971 * used so that the frame may be dropped if encryption would
972 * have been expected.
973 */
974 struct ieee80211_key *key = NULL;
897bed8b
JB		 975 struct ieee80211_sub_if_data *sdata = rx->sdata;
976 int i;
977
761ab470 978 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 979 is_multicast_ether_addr(hdr->addr1) &&
980 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
981 rx->key = key;
897bed8b
JB		 982 else {
983 if (rx->sta) {
984 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
985 key = rcu_dereference(rx->sta->gtk[i]);
986 if (key)
987 break;
988 }
989 }
990 if (!key) {
991 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
992 key = rcu_dereference(sdata->keys[i]);
993 if (key)
994 break;
995 }
996 }
997 if (key)
998 rx->key = key;
999 }
0c7c10c7 1000 return RX_CONTINUE;
571ecf67 1001 } else {
39184b15 1002 u8 keyid;
3017b80b
JB		 1003 /*
1004 * The device doesn't give us the IV so we won't be
1005 * able to look up the key. That's ok though, we
1006 * don't need to decrypt the frame, we just won't
1007 * be able to keep statistics accurate.
1008 * Except for key threshold notifications, should
1009 * we somehow allow the driver to tell us which key
1010 * the hardware used if this flag is set?
1011 */
eb9fb5b8
JB		 1012 if ((status->flag & RX_FLAG_DECRYPTED) &&
1013 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1014 return RX_CONTINUE;
3017b80b 1015
761ab470 1016 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1017
1018 if (rx->skb->len < 8 + hdrlen)
e4c26add 1019 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1020
1021 /*
1022 * no need to call ieee80211_wep_get_keyidx,
1023 * it verifies a bunch of things we've done already
1024 */
39184b15
ZY		 1025 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1026 keyidx = keyid >> 6;
3017b80b 1027
e31b8213
JB		 1028 /* check per-station GTK first, if multicast packet */
1029 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1030 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1031
e31b8213
JB		 1032 /* if not found, try default key */
1033 if (!rx->key) {
1034 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1035
1036 /*
1037 * RSNA-protected unicast frames should always be
1038 * sent with pairwise or station-to-station keys,
1039 * but for WEP we allow using a key index as well.
1040 */
1041 if (rx->key &&
1042 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1043 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1044 !is_multicast_ether_addr(hdr->addr1))
1045 rx->key = NULL;
1046 }
571ecf67
JB		 1047 }
1048
3017b80b 1049 if (rx->key) {
95acac61
JB		 1050 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1051 return RX_DROP_MONITOR;
1052
571ecf67 1053 rx->key->tx_rx_count++;
011bfcc4 1054 /* TODO: add threshold stuff again */
1990af8d 1055 } else {
e4c26add 1056 return RX_DROP_MONITOR;
70f08765
JB		 1057 }
1058
39184b15
ZY		 1059 if (skb_linearize(rx->skb))
1060 return RX_DROP_UNUSABLE;
761ab470 1061 /* the hdr variable is invalid now! */
1990af8d 1062
97359d12
JB		 1063 switch (rx->key->conf.cipher) {
1064 case WLAN_CIPHER_SUITE_WEP40:
1065 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1066 /* Check for weak IVs if possible */
1067 if (rx->sta && ieee80211_is_data(fc) &&
1068 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1069 !(status->flag & RX_FLAG_DECRYPTED)) &&
1070 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1071 rx->sta->wep_weak_iv_count++;
1072
e2f036da
MN		 1073 result = ieee80211_crypto_wep_decrypt(rx);
1074 break;
97359d12 1075 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1076 result = ieee80211_crypto_tkip_decrypt(rx);
1077 break;
97359d12 1078 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1079 result = ieee80211_crypto_ccmp_decrypt(rx);
1080 break;
97359d12 1081 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1082 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1083 break;
3ffc2a90
JB		 1084 default:
1085 /*
1086 * We can reach here only with HW-only algorithms
1087 * but why didn't it decrypt the frame?!
1088 */
1089 return RX_DROP_UNUSABLE;
70f08765
JB		 1090 }
1091
e2f036da 1092 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1093 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1094
1095 return result;
70f08765
JB		 1096}
1097
572e0012
KV		 1098static ieee80211_rx_result debug_noinline
1099ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1100{
1101 struct ieee80211_local *local;
1102 struct ieee80211_hdr *hdr;
1103 struct sk_buff *skb;
1104
1105 local = rx->local;
1106 skb = rx->skb;
1107 hdr = (struct ieee80211_hdr *) skb->data;
1108
1109 if (!local->pspolling)
1110 return RX_CONTINUE;
1111
1112 if (!ieee80211_has_fromds(hdr->frame_control))
1113 /* this is not from AP */
1114 return RX_CONTINUE;
1115
1116 if (!ieee80211_is_data(hdr->frame_control))
1117 return RX_CONTINUE;
1118
1119 if (!ieee80211_has_moredata(hdr->frame_control)) {
1120 /* AP has no more frames buffered for us */
1121 local->pspolling = false;
1122 return RX_CONTINUE;
1123 }
1124
1125 /* more data bit is set, let's request a new frame from the AP */
1126 ieee80211_send_pspoll(local, rx->sdata);
1127
1128 return RX_CONTINUE;
1129}
1130
133b8226 1131static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1132{
133b8226 1133 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1134 struct ieee80211_local *local = sdata->local;
0795af57 1135
3e122be0 1136 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1137 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1138 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1139 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1140#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1141 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1142 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1143#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1144}
1145
ff9458d3 1146static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1147{
571ecf67 1148#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1149 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
608383bf 1150 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1151#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1152
c2c98fde 1153 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1154#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1155 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
608383bf 1156 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1157#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1158 return;
1159 }
1160
1161 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1162}
1163
d057e5a3
AN		 1164int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1165{
1166 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1167 bool in_ps;
1168
1169 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1170
1171 /* Don't let the same PS state be set twice */
c2c98fde 1172 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1173 if ((start && in_ps) || (!start && !in_ps))
1174 return -EINVAL;
1175
1176 if (start)
1177 ap_sta_ps_start(sta_inf);
1178 else
1179 ap_sta_ps_end(sta_inf);
1180
1181 return 0;
1182}
1183EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1184
47086fc5
JB		 1185static ieee80211_rx_result debug_noinline
1186ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1187{
1188 struct ieee80211_sub_if_data *sdata = rx->sdata;
1189 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1190 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1191 int tid, ac;
1192
1193 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1194 return RX_CONTINUE;
1195
1196 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1197 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1198 return RX_CONTINUE;
1199
1200 /*
1201 * The device handles station powersave, so don't do anything about
1202 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1203 * it to mac80211 since they're handled.)
1204 */
1205 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1206 return RX_CONTINUE;
1207
1208 /*
1209 * Don't do anything if the station isn't already asleep. In
1210 * the uAPSD case, the station will probably be marked asleep,
1211 * in the PS-Poll case the station must be confused ...
1212 */
c2c98fde 1213 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1214 return RX_CONTINUE;
1215
1216 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1217 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1219 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1220 else
c2c98fde 1221 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1222 }
47086fc5
JB		 1223
1224 /* Free PS Poll skb here instead of returning RX_DROP that would
1225 * count as an dropped frame. */
1226 dev_kfree_skb(rx->skb);
1227
1228 return RX_QUEUED;
1229 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1230 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1231 ieee80211_has_pm(hdr->frame_control) &&
1232 (ieee80211_is_data_qos(hdr->frame_control) ||
1233 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1234 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1235 ac = ieee802_1d_to_ac[tid & 7];
1236
1237 /*
1238 * If this AC is not trigger-enabled do nothing.
1239 *
1240 * NB: This could/should check a separate bitmap of trigger-
1241 * enabled queues, but for now we only implement uAPSD w/o
1242 * TSPEC changes to the ACs, so they're always the same.
1243 */
1244 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1245 return RX_CONTINUE;
1246
1247 /* if we are in a service period, do nothing */
c2c98fde 1248 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1249 return RX_CONTINUE;
1250
c2c98fde 1251 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1252 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1253 else
c2c98fde 1254 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1255 }
1256
1257 return RX_CONTINUE;
1258}
1259
49461622 1260static ieee80211_rx_result debug_noinline
5cf121c3 1261ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1262{
1263 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1264 struct sk_buff *skb = rx->skb;
1265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1267
1268 if (!sta)
9ae54c84 1269 return RX_CONTINUE;
571ecf67 1270
b291ba11
JB		 1271 /*
1272 * Update last_rx only for IBSS packets which are for the current
1273 * BSSID to avoid keeping the current IBSS network alive in cases
1274 * where other STAs start using different BSSID.
1275 */
05c914fe 1276 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1277 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1278 NL80211_IFTYPE_ADHOC);
3af6334c 1279 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1280 sta->last_rx = jiffies;
3af6334c
FF		 1281 if (ieee80211_is_data(hdr->frame_control)) {
1282 sta->last_rx_rate_idx = status->rate_idx;
1283 sta->last_rx_rate_flag = status->flag;
1284 }
1285 }
b291ba11
JB		 1286 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1287 /*
33b64eb2
LCC		 1288 * Mesh beacons will update last_rx when if they are found to
1289 * match the current local configuration when processed.
571ecf67 1290 */
b291ba11 1291 sta->last_rx = jiffies;
3af6334c
FF		 1292 if (ieee80211_is_data(hdr->frame_control)) {
1293 sta->last_rx_rate_idx = status->rate_idx;
1294 sta->last_rx_rate_flag = status->flag;
1295 }
571ecf67
JB		 1296 }
1297
554891e6 1298 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1299 return RX_CONTINUE;
571ecf67 1300
3cf335d5
KV		 1301 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1302 ieee80211_sta_rx_notify(rx->sdata, hdr);
1303
571ecf67
JB		 1304 sta->rx_fragments++;
1305 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1306 sta->last_signal = status->signal;
541a45a1 1307 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1308
72eaa43a
JB		 1309 /*
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1312 */
d057e5a3
AN		 1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1319 /*
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1326 */
1327 if (ieee80211_is_data(hdr->frame_control) &&
1328 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1329 ap_sta_ps_end(sta);
72eaa43a
JB		 1330 } else {
1331 if (ieee80211_has_pm(hdr->frame_control))
1332 ap_sta_ps_start(sta);
1333 }
571ecf67
JB		 1334 }
1335
22403def
JB		 1336 /*
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1339 */
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1343
1344 /*
1345 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
d524215f
FF		 1349 */
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1357 GFP_ATOMIC);
d524215f 1358 return RX_DROP_MONITOR;
e7f4a940 1359 }
22403def
JB		 1360 /*
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1363 */
571ecf67
JB		 1364 sta->rx_packets++;
1365 dev_kfree_skb(rx->skb);
9ae54c84 1366 return RX_QUEUED;
571ecf67
JB		 1367 }
1368
9ae54c84 1369 return RX_CONTINUE;
571ecf67
JB		 1370} /* ieee80211_rx_h_sta_process */
1371
571ecf67
JB		 1372static inline struct ieee80211_fragment_entry *
1373ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374 unsigned int frag, unsigned int seq, int rx_queue,
1375 struct sk_buff **skb)
1376{
1377 struct ieee80211_fragment_entry *entry;
1378 int idx;
1379
1380 idx = sdata->fragment_next;
1381 entry = &sdata->fragments[sdata->fragment_next++];
1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383 sdata->fragment_next = 0;
1384
1385 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1386#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1387 struct ieee80211_hdr *hdr =
1388 (struct ieee80211_hdr *) entry->skb_list.next->data;
1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1391 "addr1=%pM addr2=%pM\n",
47846c9b 1392 sdata->name, idx,
571ecf67 1393 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1394 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1395#endif
571ecf67
JB		 1396 __skb_queue_purge(&entry->skb_list);
1397 }
1398
1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1400 *skb = NULL;
1401 entry->first_frag_time = jiffies;
1402 entry->seq = seq;
1403 entry->rx_queue = rx_queue;
1404 entry->last_frag = frag;
1405 entry->ccmp = 0;
1406 entry->extra_len = 0;
1407
1408 return entry;
1409}
1410
1411static inline struct ieee80211_fragment_entry *
1412ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1413 unsigned int frag, unsigned int seq,
571ecf67
JB		 1414 int rx_queue, struct ieee80211_hdr *hdr)
1415{
1416 struct ieee80211_fragment_entry *entry;
1417 int i, idx;
1418
1419 idx = sdata->fragment_next;
1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1422
1423 idx--;
1424 if (idx < 0)
1425 idx = IEEE80211_FRAGMENT_MAX - 1;
1426
1427 entry = &sdata->fragments[idx];
1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429 entry->rx_queue != rx_queue ||
1430 entry->last_frag + 1 != frag)
1431 continue;
1432
b73d70ad 1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1434
b73d70ad
HH		 1435 /*
1436 * Check ftype and addresses are equal, else check next fragment
1437 */
1438 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1442 continue;
1443
ab46623e 1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1445 __skb_queue_purge(&entry->skb_list);
1446 continue;
1447 }
1448 return entry;
1449 }
1450
1451 return NULL;
1452}
1453
49461622 1454static ieee80211_rx_result debug_noinline
5cf121c3 1455ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1456{
1457 struct ieee80211_hdr *hdr;
1458 u16 sc;
358c8d9d 1459 __le16 fc;
571ecf67
JB		 1460 unsigned int frag, seq;
1461 struct ieee80211_fragment_entry *entry;
1462 struct sk_buff *skb;
554891e6 1463 struct ieee80211_rx_status *status;
571ecf67 1464
b73d70ad 1465 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1466 fc = hdr->frame_control;
571ecf67
JB		 1467 sc = le16_to_cpu(hdr->seq_ctrl);
1468 frag = sc & IEEE80211_SCTL_FRAG;
1469
358c8d9d 1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1471 (rx->skb)->len < 24 ||
1472 is_multicast_ether_addr(hdr->addr1))) {
1473 /* not fragmented */
1474 goto out;
1475 }
1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1477
e3cf8b3f
ZY		 1478 if (skb_linearize(rx->skb))
1479 return RX_DROP_UNUSABLE;
1480
058897a4
AK		 1481 /*
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1485 */
1486 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1488
1489 if (frag == 0) {
1490 /* This is the first fragment of a new frame. */
1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1492 rx->seqno_idx, &(rx->skb));
97359d12 1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1494 ieee80211_has_protected(fc)) {
9e26297a 1495 int queue = rx->security_idx;
571ecf67
JB		 1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1498 entry->ccmp = 1;
1499 memcpy(entry->last_pn,
9190252c 1500 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1501 CCMP_PN_LEN);
1502 }
9ae54c84 1503 return RX_QUEUED;
571ecf67
JB		 1504 }
1505
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1508 */
9e26297a
JB		 1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510 rx->seqno_idx, hdr);
571ecf67
JB		 1511 if (!entry) {
1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1513 return RX_DROP_MONITOR;
571ecf67
JB		 1514 }
1515
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1518 if (entry->ccmp) {
1519 int i;
1520 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1521 int queue;
97359d12 1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1523 return RX_DROP_UNUSABLE;
571ecf67
JB		 1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1526 pn[i]++;
1527 if (pn[i])
1528 break;
1529 }
9e26297a 1530 queue = rx->security_idx;
9190252c 1531 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1532 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1533 return RX_DROP_UNUSABLE;
571ecf67
JB		 1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1535 }
1536
358c8d9d 1537 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1538 __skb_queue_tail(&entry->skb_list, rx->skb);
1539 entry->last_frag = frag;
1540 entry->extra_len += rx->skb->len;
358c8d9d 1541 if (ieee80211_has_morefrags(fc)) {
571ecf67 1542 rx->skb = NULL;
9ae54c84 1543 return RX_QUEUED;
571ecf67
JB		 1544 }
1545
1546 rx->skb = __skb_dequeue(&entry->skb_list);
1547 if (skb_tailroom(rx->skb) < entry->extra_len) {
1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1550 GFP_ATOMIC))) {
1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552 __skb_queue_purge(&entry->skb_list);
e4c26add 1553 return RX_DROP_UNUSABLE;
571ecf67
JB		 1554 }
1555 }
1556 while ((skb = __skb_dequeue(&entry->skb_list))) {
1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1558 dev_kfree_skb(skb);
1559 }
1560
1561 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1562 status = IEEE80211_SKB_RXCB(rx->skb);
1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1564
1565 out:
1566 if (rx->sta)
1567 rx->sta->rx_packets++;
1568 if (is_multicast_ether_addr(hdr->addr1))
1569 rx->local->dot11MulticastReceivedFrameCount++;
1570 else
1571 ieee80211_led_rx(rx->local);
9ae54c84 1572 return RX_CONTINUE;
571ecf67
JB		 1573}
1574
76ee65bf 1575static int
5cf121c3 1576ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1577{
07346f81 1578 if (unlikely(!rx->sta ||
c2c98fde 1579 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1580 return -EACCES;
571ecf67 1581
76ee65bf 1582 return 0;
571ecf67
JB		 1583}
1584
76ee65bf 1585static int
358c8d9d 1586ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1587{
eb9fb5b8
JB		 1588 struct sk_buff *skb = rx->skb;
1589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1590
3017b80b 1591 /*
7848ba7d
JB		 1592 * Pass through unencrypted frames if the hardware has
1593 * decrypted them already.
3017b80b 1594 */
eb9fb5b8 1595 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1596 return 0;
571ecf67
JB		 1597
1598 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1599 if (unlikely(!ieee80211_has_protected(fc) &&
1600 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1601 ieee80211_is_data(fc) &&
b3fc9c6c 1602 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1603 return -EACCES;
bef5d1c7
JB		 1604
1605 return 0;
1606}
1607
1608static int
1609ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1610{
1611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1613 __le16 fc = hdr->frame_control;
bef5d1c7 1614
e3efca0a
JM		 1615 /*
1616 * Pass through unencrypted frames if the hardware has
1617 * decrypted them already.
1618 */
1619 if (status->flag & RX_FLAG_DECRYPTED)
1620 return 0;
bef5d1c7 1621
c2c98fde 1622 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1623 if (unlikely(!ieee80211_has_protected(fc) &&
1624 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1625 rx->key)) {
1626 if (ieee80211_is_deauth(fc))
1627 cfg80211_send_unprot_deauth(rx->sdata->dev,
1628 rx->skb->data,
1629 rx->skb->len);
1630 else if (ieee80211_is_disassoc(fc))
1631 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1632 rx->skb->data,
1633 rx->skb->len);
f2ca3ea4 1634 return -EACCES;
cf4e594e 1635 }
f2ca3ea4 1636 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1638 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1639 if (ieee80211_is_deauth(fc))
1640 cfg80211_send_unprot_deauth(rx->sdata->dev,
1641 rx->skb->data,
1642 rx->skb->len);
1643 else if (ieee80211_is_disassoc(fc))
1644 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1645 rx->skb->data,
1646 rx->skb->len);
f2ca3ea4 1647 return -EACCES;
cf4e594e 1648 }
f2ca3ea4
JM		 1649 /*
1650 * When using MFP, Action frames are not allowed prior to
1651 * having configured keys.
1652 */
1653 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1654 ieee80211_is_robust_mgmt_frame(
1655 (struct ieee80211_hdr *) rx->skb->data)))
1656 return -EACCES;
1657 }
b3fc9c6c 1658
76ee65bf 1659 return 0;
571ecf67
JB		 1660}
1661
76ee65bf 1662static int
4114fa21 1663__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1664{
eb9fb5b8 1665 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1666 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1667 bool check_port_control = false;
1668 struct ethhdr *ehdr;
1669 int ret;
f14543ee 1670
4114fa21 1671 *port_control = false;
9bc383de
JB		 1672 if (ieee80211_has_a4(hdr->frame_control) &&
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1674 return -1;
9bc383de 1675
fbb327c5
FF		 1676 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1677 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1678
1679 if (!sdata->u.mgd.use_4addr)
1680 return -1;
1681 else
1682 check_port_control = true;
1683 }
1684
9bc383de 1685 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1687 return -1;
571ecf67 1688
fbb327c5 1689 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1690 if (ret < 0)
fbb327c5
FF		 1691 return ret;
1692
1693 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1694 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1695 *port_control = true;
1696 else if (check_port_control)
fbb327c5
FF		 1697 return -1;
1698
1699 return 0;
76ee65bf 1700}
571ecf67 1701
ce3edf6d
JB		 1702/*
1703 * requires that rx->skb is a frame with ethernet header
1704 */
358c8d9d 1705static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1706{
c97c23e3 1707 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1710
1711 /*
1712 * Allow EAPOL frames to us/the PAE group address regardless
1713 * of whether the frame was encrypted or not.
1714 */
a621fa4d 1715 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1716 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1717 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1718 return true;
1719
1720 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1721 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1722 return false;
1723
1724 return true;
1725}
1726
1727/*
1728 * requires that rx->skb is a frame with ethernet header
1729 */
76ee65bf 1730static void
5cf121c3 1731ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1732{
eb9fb5b8
JB		 1733 struct ieee80211_sub_if_data *sdata = rx->sdata;
1734 struct net_device *dev = sdata->dev;
76ee65bf 1735 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1736 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1737 struct sta_info *dsta;
554891e6 1738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1739
76ee65bf
RR		 1740 skb = rx->skb;
1741 xmit_skb = NULL;
571ecf67 1742
05c914fe
JB		 1743 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1744 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1745 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1746 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1747 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1748 if (is_multicast_ether_addr(ehdr->h_dest)) {
1749 /*
1750 * send multicast frames both to higher layers in
1751 * local net stack and back to the wireless medium
1752 */
76ee65bf
RR		 1753 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1755 printk(KERN_DEBUG "%s: failed to clone "
1756 "multicast frame\n", dev->name);
1757 } else {
abe60632
JB		 1758 dsta = sta_info_get(sdata, skb->data);
1759 if (dsta) {
ce3edf6d
JB		 1760 /*
1761 * The destination station is associated to
1762 * this AP (in this VLAN), so send the frame
1763 * directly to it and do not pass it to local
1764 * net stack.
571ecf67 1765 */
76ee65bf 1766 xmit_skb = skb;
571ecf67
JB		 1767 skb = NULL;
1768 }
571ecf67
JB		 1769 }
1770 }
1771
1772 if (skb) {
d1c3a37c
JB		 1773 int align __maybe_unused;
1774
59d9cb07 1775#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1776 /*
1777 * 'align' will only take the values 0 or 2 here
1778 * since all frames are required to be aligned
1779 * to 2-byte boundaries when being passed to
1780 * mac80211. That also explains the __skb_push()
1781 * below.
1782 */
dacb6f1d 1783 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1784 if (align) {
1785 if (WARN_ON(skb_headroom(skb) < 3)) {
1786 dev_kfree_skb(skb);
1787 skb = NULL;
1788 } else {
1789 u8 *data = skb->data;
8ce0b589
ZY		 1790 size_t len = skb_headlen(skb);
1791 skb->data -= align;
1792 memmove(skb->data, data, len);
1793 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1794 }
1795 }
1796#endif
1797
1798 if (skb) {
1799 /* deliver to local stack */
1800 skb->protocol = eth_type_trans(skb, dev);
1801 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1802 netif_receive_skb(skb);
d1c3a37c 1803 }
571ecf67
JB		 1804 }
1805
76ee65bf 1806 if (xmit_skb) {
aef6c928
HS		 1807 /*
1808 * Send to wireless media and increase priority by 256 to
1809 * keep the received priority instead of reclassifying
1810 * the frame (see cfg80211_classify8021d).
1811 */
1812 xmit_skb->priority += 256;
f831e909 1813 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1814 skb_reset_network_header(xmit_skb);
1815 skb_reset_mac_header(xmit_skb);
76ee65bf 1816 dev_queue_xmit(xmit_skb);
571ecf67 1817 }
76ee65bf
RR		 1818}
1819
49461622 1820static ieee80211_rx_result debug_noinline
5cf121c3 1821ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1822{
eb9fb5b8 1823 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1824 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1826 __le16 fc = hdr->frame_control;
eaf85ca7 1827 struct sk_buff_head frame_list;
554891e6 1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1829
358c8d9d 1830 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1831 return RX_CONTINUE;
fd4c7f2f 1832
358c8d9d 1833 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1834 return RX_DROP_MONITOR;
fd4c7f2f 1835
554891e6 1836 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1837 return RX_CONTINUE;
fd4c7f2f 1838
eaf85ca7
ZY		 1839 if (ieee80211_has_a4(hdr->frame_control) &&
1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841 !rx->sdata->u.vlan.sta)
e4c26add 1842 return RX_DROP_UNUSABLE;
fd4c7f2f 1843
eaf85ca7
ZY		 1844 if (is_multicast_ether_addr(hdr->addr1) &&
1845 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 rx->sdata->u.vlan.sta) ||
1847 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1848 rx->sdata->u.mgd.use_4addr)))
e4c26add 1849 return RX_DROP_UNUSABLE;
fd4c7f2f 1850
eaf85ca7
ZY		 1851 skb->dev = dev;
1852 __skb_queue_head_init(&frame_list);
fd4c7f2f 1853
e3cf8b3f
ZY		 1854 if (skb_linearize(skb))
1855 return RX_DROP_UNUSABLE;
1856
eaf85ca7
ZY		 1857 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1858 rx->sdata->vif.type,
8b3becad 1859 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1860
eaf85ca7
ZY		 1861 while (!skb_queue_empty(&frame_list)) {
1862 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1863
358c8d9d 1864 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1865 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1866 continue;
1867 }
eaf85ca7
ZY		 1868 dev->stats.rx_packets++;
1869 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1870
1871 ieee80211_deliver_skb(rx);
1872 }
1873
9ae54c84 1874 return RX_QUEUED;
fd4c7f2f
RR		 1875}
1876
bf94e17b 1877#ifdef CONFIG_MAC80211_MESH
b0dee578 1878static ieee80211_rx_result
e32f85f7
LCC		 1879ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1880{
30789eb6
TP		 1881 struct ieee80211_hdr *fwd_hdr, *hdr;
1882 struct ieee80211_tx_info *info;
e32f85f7 1883 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1884 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1885 struct ieee80211_local *local = rx->local;
eb9fb5b8 1886 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1889 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1890 u16 q, hdrlen;
e32f85f7
LCC		 1891
1892 hdr = (struct ieee80211_hdr *) skb->data;
1893 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1894 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1895
2157fdd6
TP		 1896 /* frame is in RMC, don't forward */
1897 if (ieee80211_is_data(hdr->frame_control) &&
1898 is_multicast_ether_addr(hdr->addr1) &&
1899 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1900 return RX_DROP_MONITOR;
1901
e32f85f7
LCC		 1902 if (!ieee80211_is_data(hdr->frame_control))
1903 return RX_CONTINUE;
1904
1905 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1906 return RX_DROP_MONITOR;
1907
43b7b314 1908 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1909 struct mesh_path *mppath;
43b7b314
JC		 1910 char *proxied_addr;
1911 char *mpp_addr;
1912
1913 if (is_multicast_ether_addr(hdr->addr1)) {
1914 mpp_addr = hdr->addr3;
1915 proxied_addr = mesh_hdr->eaddr1;
1916 } else {
1917 mpp_addr = hdr->addr4;
1918 proxied_addr = mesh_hdr->eaddr2;
1919 }
79617dee 1920
79617dee 1921 rcu_read_lock();
43b7b314 1922 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1923 if (!mppath) {
43b7b314 1924 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1925 } else {
1926 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1927 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1928 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1929 spin_unlock_bh(&mppath->state_lock);
1930 }
1931 rcu_read_unlock();
1932 }
1933
3c5772a5
JC		 1934 /* Frame has reached destination. Don't forward */
1935 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1936 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1937 return RX_CONTINUE;
1938
d3c1597b
TP		 1939 q = ieee80211_select_queue_80211(local, skb, hdr);
1940 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1942 return RX_DROP_MONITOR;
1943 }
1944 skb_set_queue_mapping(skb, q);
e32f85f7 1945
30789eb6
TP		 1946 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1947 goto out;
c8a61a7d 1948
30789eb6
TP		 1949 if (!--mesh_hdr->ttl) {
1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1951 return RX_DROP_MONITOR;
1952 }
1953
1954 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1955 if (!fwd_skb) {
1956 if (net_ratelimit())
1957 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1958 sdata->name);
1959 goto out;
1960 }
1961
1962 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1963 info = IEEE80211_SKB_CB(fwd_skb);
1964 memset(info, 0, sizeof(*info));
1965 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1966 info->control.vif = &rx->sdata->vif;
1967 info->control.jiffies = jiffies;
1968 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1969 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1970 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1971 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1973 } else {
1974 /* unable to resolve next hop */
1975 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1976 0, reason, fwd_hdr->addr2, sdata);
1977 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1978 kfree_skb(fwd_skb);
30789eb6 1979 return RX_DROP_MONITOR;
e32f85f7
LCC		 1980 }
1981
30789eb6
TP		 1982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1983 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1984 out:
3c5772a5 1985 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1986 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1987 return RX_CONTINUE;
1988 else
1989 return RX_DROP_MONITOR;
1990}
bf94e17b 1991#endif
e32f85f7 1992
49461622 1993static ieee80211_rx_result debug_noinline
5cf121c3 1994ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1995{
eb9fb5b8 1996 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1997 struct ieee80211_local *local = rx->local;
eb9fb5b8 1998 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1999 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2000 __le16 fc = hdr->frame_control;
4114fa21 2001 bool port_control;
ce3edf6d 2002 int err;
76ee65bf 2003
358c8d9d 2004 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2005 return RX_CONTINUE;
76ee65bf 2006
358c8d9d 2007 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2008 return RX_DROP_MONITOR;
76ee65bf 2009
f14543ee 2010 /*
e7f4a940
JB		 2011 * Send unexpected-4addr-frame event to hostapd. For older versions,
2012 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2013 */
2014 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2015 sdata->vif.type == NL80211_IFTYPE_AP) {
2016 if (rx->sta &&
2017 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2018 cfg80211_rx_unexpected_4addr_frame(
2019 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2020 return RX_DROP_MONITOR;
e7f4a940 2021 }
f14543ee 2022
4114fa21 2023 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2024 if (unlikely(err))
e4c26add 2025 return RX_DROP_UNUSABLE;
76ee65bf 2026
358c8d9d 2027 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2028 return RX_DROP_MONITOR;
ce3edf6d 2029
4114fa21
FF		 2030 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2031 unlikely(port_control) && sdata->bss) {
2032 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2033 u.ap);
2034 dev = sdata->dev;
2035 rx->sdata = sdata;
2036 }
2037
76ee65bf
RR		 2038 rx->skb->dev = dev;
2039
2040 dev->stats.rx_packets++;
2041 dev->stats.rx_bytes += rx->skb->len;
2042
08ca944e 2043 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2044 !is_multicast_ether_addr(
2045 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2046 (!local->scanning &&
2047 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2048 mod_timer(&local->dynamic_ps_timer, jiffies +
2049 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2050 }
2051
76ee65bf 2052 ieee80211_deliver_skb(rx);
571ecf67 2053
9ae54c84 2054 return RX_QUEUED;
571ecf67
JB		 2055}
2056
49461622 2057static ieee80211_rx_result debug_noinline
24a8fdad 2058ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2059{
2060 struct ieee80211_local *local = rx->local;
2061 struct ieee80211_hw *hw = &local->hw;
2062 struct sk_buff *skb = rx->skb;
a7767f95 2063 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2064 struct tid_ampdu_rx *tid_agg_rx;
2065 u16 start_seq_num;
2066 u16 tid;
2067
a7767f95 2068 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2069 return RX_CONTINUE;
71364716 2070
a7767f95 2071 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2072 struct {
2073 __le16 control, start_seq_num;
2074 } __packed bar_data;
2075
71364716 2076 if (!rx->sta)
a02ae758 2077 return RX_DROP_MONITOR;
8ae5977f
JB		 2078
2079 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2080 &bar_data, sizeof(bar_data)))
2081 return RX_DROP_MONITOR;
2082
8ae5977f 2083 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2084
2085 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2086 if (!tid_agg_rx)
a02ae758 2087 return RX_DROP_MONITOR;
71364716 2088
8ae5977f 2089 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2090
2091 /* reset session timer */
20ad19d0
JB		 2092 if (tid_agg_rx->timeout)
2093 mod_timer(&tid_agg_rx->session_timer,
2094 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2095
dd318575 2096 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2097 /* release stored frames up to start of BAR */
24a8fdad 2098 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2099 spin_unlock(&tid_agg_rx->reorder_lock);
2100
a02ae758
JB		 2101 kfree_skb(skb);
2102 return RX_QUEUED;
71364716
RR		 2103 }
2104
08daecae
JB		 2105 /*
2106 * After this point, we only want management frames,
2107 * so we can drop all remaining control frames to
2108 * cooked monitor interfaces.
2109 */
2110 return RX_DROP_MONITOR;
71364716
RR		 2111}
2112
f4f727a6
JM		 2113static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2114 struct ieee80211_mgmt *mgmt,
2115 size_t len)
fea14732
JM		 2116{
2117 struct ieee80211_local *local = sdata->local;
2118 struct sk_buff *skb;
2119 struct ieee80211_mgmt *resp;
2120
47846c9b 2121 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2122 /* Not to own unicast address */
2123 return;
2124 }
2125
46900298
JB		 2126 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2127 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2128 /* Not from the current AP or not associated yet. */
fea14732
JM		 2129 return;
2130 }
2131
2132 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2133 /* Too short SA Query request frame */
2134 return;
2135 }
2136
2137 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2138 if (skb == NULL)
2139 return;
2140
2141 skb_reserve(skb, local->hw.extra_tx_headroom);
2142 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2143 memset(resp, 0, 24);
2144 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2145 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2146 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2147 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2148 IEEE80211_STYPE_ACTION);
2149 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2150 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2151 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2152 memcpy(resp->u.action.u.sa_query.trans_id,
2153 mgmt->u.action.u.sa_query.trans_id,
2154 WLAN_SA_QUERY_TR_ID_LEN);
2155
62ae67be 2156 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2157}
2158
2e161f78
JB		 2159static ieee80211_rx_result debug_noinline
2160ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2161{
2162 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2164
2165 /*
2166 * From here on, look only at management frames.
2167 * Data and control frames are already handled,
2168 * and unknown (reserved) frames are useless.
2169 */
2170 if (rx->skb->len < 24)
2171 return RX_DROP_MONITOR;
2172
2173 if (!ieee80211_is_mgmt(mgmt->frame_control))
2174 return RX_DROP_MONITOR;
2175
ee971924
JB		 2176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2177 ieee80211_is_beacon(mgmt->frame_control) &&
2178 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
ee971924
JB		 2179 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2180 rx->skb->data, rx->skb->len,
2181 status->freq, GFP_ATOMIC);
2182 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2183 }
2184
554891e6 2185 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2186 return RX_DROP_MONITOR;
2187
2188 if (ieee80211_drop_unencrypted_mgmt(rx))
2189 return RX_DROP_UNUSABLE;
2190
2191 return RX_CONTINUE;
2192}
2193
de1ede7a
JB		 2194static ieee80211_rx_result debug_noinline
2195ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2196{
2197 struct ieee80211_local *local = rx->local;
eb9fb5b8 2198 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2199 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2200 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2201 int len = rx->skb->len;
2202
2203 if (!ieee80211_is_action(mgmt->frame_control))
2204 return RX_CONTINUE;
2205
026331c4
JM		 2206 /* drop too small frames */
2207 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2208 return RX_DROP_UNUSABLE;
de1ede7a 2209
026331c4 2210 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2211 return RX_DROP_UNUSABLE;
de1ede7a 2212
554891e6 2213 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2214 return RX_DROP_UNUSABLE;
97ebe12a 2215
de1ede7a 2216 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2217 case WLAN_CATEGORY_HT:
2218 /* reject HT action frames from stations not supporting HT */
2219 if (!rx->sta->sta.ht_cap.ht_supported)
2220 goto invalid;
2221
2222 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2223 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2224 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2225 sdata->vif.type != NL80211_IFTYPE_AP &&
2226 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2227 break;
2228
2229 /* verify action & smps_control are present */
2230 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2231 goto invalid;
2232
2233 switch (mgmt->u.action.u.ht_smps.action) {
2234 case WLAN_HT_ACTION_SMPS: {
2235 struct ieee80211_supported_band *sband;
2236 u8 smps;
2237
2238 /* convert to HT capability */
2239 switch (mgmt->u.action.u.ht_smps.smps_control) {
2240 case WLAN_HT_SMPS_CONTROL_DISABLED:
2241 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2242 break;
2243 case WLAN_HT_SMPS_CONTROL_STATIC:
2244 smps = WLAN_HT_CAP_SM_PS_STATIC;
2245 break;
2246 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2247 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2248 break;
2249 default:
2250 goto invalid;
2251 }
2252 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2253
2254 /* if no change do nothing */
2255 if ((rx->sta->sta.ht_cap.cap &
2256 IEEE80211_HT_CAP_SM_PS) == smps)
2257 goto handled;
2258
2259 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2260 rx->sta->sta.ht_cap.cap |= smps;
2261
2262 sband = rx->local->hw.wiphy->bands[status->band];
2263
2264 rate_control_rate_update(local, sband, rx->sta,
2265 IEEE80211_RC_SMPS_CHANGED,
2266 local->_oper_channel_type);
2267 goto handled;
2268 }
2269 default:
2270 goto invalid;
2271 }
2272
2273 break;
de1ede7a 2274 case WLAN_CATEGORY_BACK:
8abd3f9b 2275 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2276 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2277 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2278 sdata->vif.type != NL80211_IFTYPE_AP &&
2279 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2280 break;
8abd3f9b 2281
026331c4
JM		 2282 /* verify action_code is present */
2283 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2284 break;
2285
de1ede7a
JB		 2286 switch (mgmt->u.action.u.addba_req.action_code) {
2287 case WLAN_ACTION_ADDBA_REQ:
2288 if (len < (IEEE80211_MIN_ACTION_SIZE +
2289 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2290 goto invalid;
2291 break;
de1ede7a
JB		 2292 case WLAN_ACTION_ADDBA_RESP:
2293 if (len < (IEEE80211_MIN_ACTION_SIZE +
2294 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2295 goto invalid;
2296 break;
de1ede7a
JB		 2297 case WLAN_ACTION_DELBA:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2300 goto invalid;
2301 break;
2302 default:
2303 goto invalid;
de1ede7a 2304 }
bed7ee6e 2305
8b58ff83 2306 goto queue;
39192c0b
JB		 2307 case WLAN_CATEGORY_SPECTRUM_MGMT:
2308 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2309 break;
46900298
JB		 2310
2311 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2312 break;
46900298 2313
026331c4
JM		 2314 /* verify action_code is present */
2315 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2316 break;
2317
39192c0b
JB		 2318 switch (mgmt->u.action.u.measurement.action_code) {
2319 case WLAN_ACTION_SPCT_MSR_REQ:
2320 if (len < (IEEE80211_MIN_ACTION_SIZE +
2321 sizeof(mgmt->u.action.u.measurement)))
84040805 2322 break;
39192c0b 2323 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2324 goto handled;
c481ec97
S		 2325 case WLAN_ACTION_SPCT_CHL_SWITCH:
2326 if (len < (IEEE80211_MIN_ACTION_SIZE +
2327 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2328 break;
c481ec97 2329
cc32abd4 2330 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2331 break;
cc32abd4 2332
46900298 2333 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2334 break;
c481ec97 2335
8b58ff83 2336 goto queue;
39192c0b
JB		 2337 }
2338 break;
fea14732
JM		 2339 case WLAN_CATEGORY_SA_QUERY:
2340 if (len < (IEEE80211_MIN_ACTION_SIZE +
2341 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2342 break;
2343
fea14732
JM		 2344 switch (mgmt->u.action.u.sa_query.action) {
2345 case WLAN_ACTION_SA_QUERY_REQUEST:
2346 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2347 break;
fea14732 2348 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2349 goto handled;
fea14732
JM		 2350 }
2351 break;
8db09850
TP		 2352 case WLAN_CATEGORY_SELF_PROTECTED:
2353 switch (mgmt->u.action.u.self_prot.action_code) {
2354 case WLAN_SP_MESH_PEERING_OPEN:
2355 case WLAN_SP_MESH_PEERING_CLOSE:
2356 case WLAN_SP_MESH_PEERING_CONFIRM:
2357 if (!ieee80211_vif_is_mesh(&sdata->vif))
2358 goto invalid;
2359 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2360 /* userspace handles this frame */
2361 break;
2362 goto queue;
2363 case WLAN_SP_MGK_INFORM:
2364 case WLAN_SP_MGK_ACK:
2365 if (!ieee80211_vif_is_mesh(&sdata->vif))
2366 goto invalid;
2367 break;
2368 }
2369 break;
d3aaec8a 2370 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2371 if (!ieee80211_vif_is_mesh(&sdata->vif))
2372 break;
25d49e4d
TP		 2373 if (mesh_action_is_path_sel(mgmt) &&
2374 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2375 break;
2376 goto queue;
84040805 2377 }
026331c4 2378
2e161f78
JB		 2379 return RX_CONTINUE;
2380
bed7ee6e 2381 invalid:
554891e6 2382 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2383 /* will return in the next handlers */
2384 return RX_CONTINUE;
2385
2386 handled:
2387 if (rx->sta)
2388 rx->sta->rx_packets++;
2389 dev_kfree_skb(rx->skb);
2390 return RX_QUEUED;
2391
2392 queue:
2393 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2394 skb_queue_tail(&sdata->skb_queue, rx->skb);
2395 ieee80211_queue_work(&local->hw, &sdata->work);
2396 if (rx->sta)
2397 rx->sta->rx_packets++;
2398 return RX_QUEUED;
2399}
2400
2401static ieee80211_rx_result debug_noinline
2402ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2403{
554891e6 2404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2405
2406 /* skip known-bad action frames and return them in the next handler */
554891e6 2407 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2408 return RX_CONTINUE;
d7907448 2409
026331c4
JM		 2410 /*
2411 * Getting here means the kernel doesn't know how to handle
2412 * it, but maybe userspace does ... include returned frames
2413 * so userspace can register for those to know whether ones
2414 * it transmitted were processed or returned.
2415 */
026331c4 2416
2e161f78
JB		 2417 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2418 rx->skb->data, rx->skb->len,
2419 GFP_ATOMIC)) {
2420 if (rx->sta)
2421 rx->sta->rx_packets++;
2422 dev_kfree_skb(rx->skb);
2423 return RX_QUEUED;
2424 }
2425
2426
2427 return RX_CONTINUE;
2428}
2429
2430static ieee80211_rx_result debug_noinline
2431ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2432{
2433 struct ieee80211_local *local = rx->local;
2434 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2435 struct sk_buff *nskb;
2436 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2437 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2438
2439 if (!ieee80211_is_action(mgmt->frame_control))
2440 return RX_CONTINUE;
2441
2442 /*
2443 * For AP mode, hostapd is responsible for handling any action
2444 * frames that we didn't handle, including returning unknown
2445 * ones. For all other modes we will return them to the sender,
2446 * setting the 0x80 bit in the action category, as required by
2447 * 802.11-2007 7.3.1.11.
2448 * Newer versions of hostapd shall also use the management frame
2449 * registration mechanisms, but older ones still use cooked
2450 * monitor interfaces so push all frames there.
2451 */
554891e6 2452 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2453 (sdata->vif.type == NL80211_IFTYPE_AP ||
2454 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2455 return RX_DROP_MONITOR;
026331c4 2456
84040805
JB		 2457 /* do not return rejected action frames */
2458 if (mgmt->u.action.category & 0x80)
2459 return RX_DROP_UNUSABLE;
2460
2461 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2462 GFP_ATOMIC);
2463 if (nskb) {
292b4df6 2464 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2465
292b4df6
JL		 2466 nmgmt->u.action.category |= 0x80;
2467 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2468 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2469
2470 memset(nskb->cb, 0, sizeof(nskb->cb));
2471
2472 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2473 }
39192c0b
JB		 2474 dev_kfree_skb(rx->skb);
2475 return RX_QUEUED;
de1ede7a
JB		 2476}
2477
49461622 2478static ieee80211_rx_result debug_noinline
5cf121c3 2479ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2480{
eb9fb5b8 2481 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2482 ieee80211_rx_result rxs;
77a121c3
JB		 2483 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2484 __le16 stype;
571ecf67 2485
af6b6374
JB		 2486 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2487 if (rxs != RX_CONTINUE)
2488 return rxs;
2489
77a121c3 2490 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2491
77a121c3
JB		 2492 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2493 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2494 sdata->vif.type != NL80211_IFTYPE_STATION)
2495 return RX_DROP_MONITOR;
472dbc45 2496
77a121c3
JB		 2497 switch (stype) {
2498 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2499 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2500 /* process for all: mesh, mlme, ibss */
2501 break;
2502 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2503 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2504 if (is_multicast_ether_addr(mgmt->da) &&
2505 !is_broadcast_ether_addr(mgmt->da))
2506 return RX_DROP_MONITOR;
2507
77a121c3
JB		 2508 /* process only for station */
2509 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2510 return RX_DROP_MONITOR;
2511 break;
2512 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2513 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2514 /* process only for ibss */
2515 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2516 return RX_DROP_MONITOR;
2517 break;
2518 default:
2519 return RX_DROP_MONITOR;
2520 }
f9d540ee 2521
77a121c3 2522 /* queue up frame and kick off work to process it */
c1475ca9 2523 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2524 skb_queue_tail(&sdata->skb_queue, rx->skb);
2525 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2526 if (rx->sta)
2527 rx->sta->rx_packets++;
46900298 2528
77a121c3 2529 return RX_QUEUED;
571ecf67
JB		 2530}
2531
5cf121c3 2532/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2533static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2534 struct ieee80211_rate *rate)
3d30d949
MW		 2535{
2536 struct ieee80211_sub_if_data *sdata;
2537 struct ieee80211_local *local = rx->local;
2538 struct ieee80211_rtap_hdr {
2539 struct ieee80211_radiotap_header hdr;
2540 u8 flags;
5f0b7de5 2541 u8 rate_or_pad;
3d30d949
MW		 2542 __le16 chan_freq;
2543 __le16 chan_flags;
bc10502d 2544 } __packed *rthdr;
3d30d949
MW		 2545 struct sk_buff *skb = rx->skb, *skb2;
2546 struct net_device *prev_dev = NULL;
eb9fb5b8 2547 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2548
554891e6
JB		 2549 /*
2550 * If cooked monitor has been processed already, then
2551 * don't do it again. If not, set the flag.
2552 */
2553 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2554 goto out_free_skb;
554891e6 2555 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2556
152c477a
JB		 2557 /* If there are no cooked monitor interfaces, just free the SKB */
2558 if (!local->cooked_mntrs)
2559 goto out_free_skb;
2560
3d30d949
MW		 2561 if (skb_headroom(skb) < sizeof(*rthdr) &&
2562 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2563 goto out_free_skb;
2564
2565 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2566 memset(rthdr, 0, sizeof(*rthdr));
2567 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2568 rthdr->hdr.it_present =
2569 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2570 (1 << IEEE80211_RADIOTAP_CHANNEL));
2571
5f0b7de5
JB		 2572 if (rate) {
2573 rthdr->rate_or_pad = rate->bitrate / 5;
2574 rthdr->hdr.it_present |=
2575 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2576 }
3d30d949
MW		 2577 rthdr->chan_freq = cpu_to_le16(status->freq);
2578
2579 if (status->band == IEEE80211_BAND_5GHZ)
2580 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2581 IEEE80211_CHAN_5GHZ);
2582 else
2583 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2584 IEEE80211_CHAN_2GHZ);
2585
2586 skb_set_mac_header(skb, 0);
2587 skb->ip_summed = CHECKSUM_UNNECESSARY;
2588 skb->pkt_type = PACKET_OTHERHOST;
2589 skb->protocol = htons(ETH_P_802_2);
2590
2591 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2592 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2593 continue;
2594
05c914fe 2595 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2596 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2597 continue;
2598
2599 if (prev_dev) {
2600 skb2 = skb_clone(skb, GFP_ATOMIC);
2601 if (skb2) {
2602 skb2->dev = prev_dev;
5548a8a1 2603 netif_receive_skb(skb2);
3d30d949
MW		 2604 }
2605 }
2606
2607 prev_dev = sdata->dev;
2608 sdata->dev->stats.rx_packets++;
2609 sdata->dev->stats.rx_bytes += skb->len;
2610 }
2611
2612 if (prev_dev) {
2613 skb->dev = prev_dev;
5548a8a1 2614 netif_receive_skb(skb);
554891e6
JB		 2615 return;
2616 }
3d30d949
MW		 2617
2618 out_free_skb:
2619 dev_kfree_skb(skb);
2620}
2621
aa0c8636
CL		 2622static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2623 ieee80211_rx_result res)
2624{
2625 switch (res) {
2626 case RX_DROP_MONITOR:
2627 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2628 if (rx->sta)
2629 rx->sta->rx_dropped++;
2630 /* fall through */
2631 case RX_CONTINUE: {
2632 struct ieee80211_rate *rate = NULL;
2633 struct ieee80211_supported_band *sband;
2634 struct ieee80211_rx_status *status;
2635
2636 status = IEEE80211_SKB_RXCB((rx->skb));
2637
2638 sband = rx->local->hw.wiphy->bands[status->band];
2639 if (!(status->flag & RX_FLAG_HT))
2640 rate = &sband->bitrates[status->rate_idx];
2641
2642 ieee80211_rx_cooked_monitor(rx, rate);
2643 break;
2644 }
2645 case RX_DROP_UNUSABLE:
2646 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2647 if (rx->sta)
2648 rx->sta->rx_dropped++;
2649 dev_kfree_skb(rx->skb);
2650 break;
2651 case RX_QUEUED:
2652 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2653 break;
2654 }
2655}
571ecf67 2656
24a8fdad 2657static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2658{
58905290 2659 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2660 struct sk_buff *skb;
8944b79f 2661
e32f85f7
LCC		 2662#define CALL_RXH(rxh) \
2663 do { \
2664 res = rxh(rx); \
2665 if (res != RX_CONTINUE) \
2569a826 2666 goto rxh_next; \
e32f85f7 2667 } while (0);
49461622 2668
24a8fdad
CL		 2669 spin_lock(&rx->local->rx_skb_queue.lock);
2670 if (rx->local->running_rx_handler)
2671 goto unlock;
2672
2673 rx->local->running_rx_handler = true;
2674
2675 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2676 spin_unlock(&rx->local->rx_skb_queue.lock);
2677
2569a826
JB		 2678 /*
2679 * all the other fields are valid across frames
2680 * that belong to an aMPDU since they are on the
2681 * same TID from the same station
2682 */
2683 rx->skb = skb;
2684
2685 CALL_RXH(ieee80211_rx_h_decrypt)
2686 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2687 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2688 CALL_RXH(ieee80211_rx_h_sta_process)
2689 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2690 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2691 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2692#ifdef CONFIG_MAC80211_MESH
aa0c8636 2693 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2694 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2695#endif
2154c81c 2696 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2697 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2698 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2699 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2700 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2701 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2702 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2703 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2704
aa0c8636
CL		 2705 rxh_next:
2706 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2707 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2708#undef CALL_RXH
aa0c8636 2709 }
24a8fdad
CL		 2710
2711 rx->local->running_rx_handler = false;
2712
2713 unlock:
2714 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2715}
2716
4406c376 2717static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2718{
aa0c8636
CL		 2719 ieee80211_rx_result res = RX_DROP_MONITOR;
2720
aa0c8636
CL		 2721#define CALL_RXH(rxh) \
2722 do { \
2723 res = rxh(rx); \
2724 if (res != RX_CONTINUE) \
2725 goto rxh_next; \
2726 } while (0);
2727
2728 CALL_RXH(ieee80211_rx_h_passive_scan)
2729 CALL_RXH(ieee80211_rx_h_check)
2730
24a8fdad 2731 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2732
24a8fdad 2733 ieee80211_rx_handlers(rx);
aa0c8636 2734 return;
49461622 2735
2569a826 2736 rxh_next:
aa0c8636
CL		 2737 ieee80211_rx_handlers_result(rx, res);
2738
2739#undef CALL_RXH
58905290
JB		 2740}
2741
2bff8ebf 2742/*
dd318575
JB		 2743 * This function makes calls into the RX path, therefore
2744 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2745 */
2746void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2747{
554891e6
JB		 2748 struct ieee80211_rx_data rx = {
2749 .sta = sta,
2750 .sdata = sta->sdata,
2751 .local = sta->local,
9e26297a
JB		 2752 /* This is OK -- must be QoS data frame */
2753 .security_idx = tid,
2754 .seqno_idx = tid,
fcf8bd3b 2755 .flags = 0,
554891e6 2756 };
2c15a0cf
CL		 2757 struct tid_ampdu_rx *tid_agg_rx;
2758
2759 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2760 if (!tid_agg_rx)
2761 return;
2bff8ebf 2762
2c15a0cf 2763 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2764 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2765 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2766
24a8fdad 2767 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2768}
2769
571ecf67
JB		 2770/* main receive path */
2771
20b01f80 2772static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2773 struct ieee80211_hdr *hdr)
2774{
20b01f80 2775 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2776 struct sk_buff *skb = rx->skb;
2777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2778 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2779 int multicast = is_multicast_ether_addr(hdr->addr1);
2780
51fb61e7 2781 switch (sdata->vif.type) {
05c914fe 2782 case NL80211_IFTYPE_STATION:
9bc383de 2783 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2784 return 0;
77fdaa12 2785 if (!multicast &&
47846c9b 2786 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2787 if (!(sdata->dev->flags & IFF_PROMISC) ||
2788 sdata->u.mgd.use_4addr)
23a24def 2789 return 0;
554891e6 2790 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2791 }
2792 break;
05c914fe 2793 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2794 if (!bssid)
2795 return 0;
a7767f95 2796 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2797 return 1;
87291c02 2798 }
46900298 2799 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2800 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2801 return 0;
554891e6 2802 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2803 } else if (!multicast &&
47846c9b 2804 compare_ether_addr(sdata->vif.addr,
23a24def 2805 hdr->addr1) != 0) {
4150c572 2806 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2807 return 0;
554891e6 2808 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2809 } else if (!rx->sta) {
2810 int rate_idx;
eb9fb5b8 2811 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2812 rate_idx = 0; /* TODO: HT rates */
2813 else
eb9fb5b8 2814 rate_idx = status->rate_idx;
8bf11d8d
JB		 2815 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2816 BIT(rate_idx));
0fb8ca45 2817 }
23a24def 2818 break;
05c914fe 2819 case NL80211_IFTYPE_MESH_POINT:
6032f934 2820 if (!multicast &&
47846c9b 2821 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2822 hdr->addr1) != 0) {
2823 if (!(sdata->dev->flags & IFF_PROMISC))
2824 return 0;
2825
554891e6 2826 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2827 }
2828 break;
05c914fe
JB		 2829 case NL80211_IFTYPE_AP_VLAN:
2830 case NL80211_IFTYPE_AP:
23a24def 2831 if (!bssid) {
47846c9b 2832 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2833 hdr->addr1))
2834 return 0;
2835 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2836 sdata->vif.addr)) {
3df6eaea
JB		 2837 /*
2838 * Accept public action frames even when the
2839 * BSSID doesn't match, this is used for P2P
2840 * and location updates. Note that mac80211
2841 * itself never looks at these frames.
2842 */
2843 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2844 ieee80211_is_public_action(hdr, skb->len))
2845 return 1;
771bbd09 2846 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
3df6eaea 2847 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2848 return 0;
554891e6 2849 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2850 }
23a24def 2851 break;
05c914fe 2852 case NL80211_IFTYPE_WDS:
a7767f95 2853 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2854 return 0;
2855 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2856 return 0;
2857 break;
2ca27bcf 2858 default:
fb1c1cd6
JB		 2859 /* should never get here */
2860 WARN_ON(1);
2861 break;
23a24def
JB		 2862 }
2863
2864 return 1;
2865}
2866
4406c376
JB		 2867/*
2868 * This function returns whether or not the SKB
2869 * was destined for RX processing or not, which,
2870 * if consume is true, is equivalent to whether
2871 * or not the skb was consumed.
2872 */
2873static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2874 struct sk_buff *skb, bool consume)
2875{
2876 struct ieee80211_local *local = rx->local;
2877 struct ieee80211_sub_if_data *sdata = rx->sdata;
2878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2879 struct ieee80211_hdr *hdr = (void *)skb->data;
2880 int prepares;
2881
2882 rx->skb = skb;
554891e6 2883 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2884 prepares = prepare_for_handlers(rx, hdr);
2885
2886 if (!prepares)
2887 return false;
2888
4406c376
JB		 2889 if (!consume) {
2890 skb = skb_copy(skb, GFP_ATOMIC);
2891 if (!skb) {
2892 if (net_ratelimit())
2893 wiphy_debug(local->hw.wiphy,
b305dae4 2894 "failed to copy skb for %s\n",
4406c376
JB		 2895 sdata->name);
2896 return true;
2897 }
2898
2899 rx->skb = skb;
2900 }
2901
2902 ieee80211_invoke_rx_handlers(rx);
2903 return true;
2904}
2905
571ecf67 2906/*
6368e4b1
RR		 2907 * This is the actual Rx frames handler. as it blongs to Rx path it must
2908 * be called with rcu_read_lock protection.
571ecf67 2909 */
71ebb4aa 2910static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2911 struct sk_buff *skb)
571ecf67 2912{
554891e6 2913 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2914 struct ieee80211_local *local = hw_to_local(hw);
2915 struct ieee80211_sub_if_data *sdata;
571ecf67 2916 struct ieee80211_hdr *hdr;
e3cf8b3f 2917 __le16 fc;
5cf121c3 2918 struct ieee80211_rx_data rx;
4406c376 2919 struct ieee80211_sub_if_data *prev;
56af3268 2920 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2921 int err = 0;
571ecf67 2922
e3cf8b3f 2923 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2924 memset(&rx, 0, sizeof(rx));
2925 rx.skb = skb;
2926 rx.local = local;
72abd81b 2927
e3cf8b3f 2928 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2929 local->dot11ReceivedFragmentCount++;
571ecf67 2930
142b9f50 2931 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2932 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2933 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2934
e3cf8b3f
ZY		 2935 if (ieee80211_is_mgmt(fc))
2936 err = skb_linearize(skb);
2937 else
2938 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2939
2940 if (err) {
2941 dev_kfree_skb(skb);
2942 return;
2943 }
2944
2945 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2946 ieee80211_parse_qos(&rx);
d1c3a37c 2947 ieee80211_verify_alignment(&rx);
38f3714d 2948
e3cf8b3f 2949 if (ieee80211_is_data(fc)) {
56af3268 2950 prev_sta = NULL;
4406c376 2951
2a33bee2 2952 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2953 if (!prev_sta) {
2954 prev_sta = sta;
2955 continue;
2956 }
2957
2958 rx.sta = prev_sta;
2959 rx.sdata = prev_sta->sdata;
4406c376 2960 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2961
56af3268 2962 prev_sta = sta;
4406c376 2963 }
56af3268
BG		 2964
2965 if (prev_sta) {
2966 rx.sta = prev_sta;
2967 rx.sdata = prev_sta->sdata;
2968
4406c376 2969 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2970 return;
8e26d5ad 2971 goto out;
56af3268 2972 }
4406c376
JB		 2973 }
2974
4b0dd98e 2975 prev = NULL;
b2e7771e 2976
4b0dd98e
JB		 2977 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2978 if (!ieee80211_sdata_running(sdata))
2979 continue;
340e11f3 2980
4b0dd98e
JB		 2981 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2982 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2983 continue;
340e11f3 2984
4b0dd98e
JB		 2985 /*
2986 * frame is destined for this interface, but if it's
2987 * not also for the previous one we handle that after
2988 * the loop to avoid copying the SKB once too much
2989 */
4bb29f8c 2990
4b0dd98e 2991 if (!prev) {
abe60632 2992 prev = sdata;
4b0dd98e 2993 continue;
340e11f3 2994 }
4bb29f8c 2995
2a33bee2 2996 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2997 rx.sdata = prev;
2998 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2999
4b0dd98e
JB		 3000 prev = sdata;
3001 }
3002
3003 if (prev) {
2a33bee2 3004 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 3005 rx.sdata = prev;
4406c376 3006
4b0dd98e
JB		 3007 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3008 return;
571ecf67 3009 }
4406c376 3010
8e26d5ad 3011 out:
4406c376 3012 dev_kfree_skb(skb);
571ecf67 3013}
6368e4b1
RR		 3014
3015/*
3016 * This is the receive path handler. It is called by a low level driver when an
3017 * 802.11 MPDU is received from the hardware.
3018 */
103bf9f7 3019void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3020{
3021 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3022 struct ieee80211_rate *rate = NULL;
3023 struct ieee80211_supported_band *sband;
f1d58c25 3024 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3025
d20ef63d
JB		 3026 WARN_ON_ONCE(softirq_count() == 0);
3027
77a980dc
JB		 3028 if (WARN_ON(status->band < 0 ||
3029 status->band >= IEEE80211_NUM_BANDS))
3030 goto drop;
8318d78a
JB		 3031
3032 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3033 if (WARN_ON(!sband))
3034 goto drop;
8318d78a 3035
89c3a8ac
JB		 3036 /*
3037 * If we're suspending, it is possible although not too likely
3038 * that we'd be receiving frames after having already partially
3039 * quiesced the stack. We can't process such frames then since
3040 * that might, for example, cause stations to be added or other
3041 * driver callbacks be invoked.
3042 */
77a980dc
JB		 3043 if (unlikely(local->quiescing || local->suspended))
3044 goto drop;
89c3a8ac 3045
ea77f12f
JB		 3046 /*
3047 * The same happens when we're not even started,
3048 * but that's worth a warning.
3049 */
77a980dc
JB		 3050 if (WARN_ON(!local->started))
3051 goto drop;
ea77f12f 3052
fc885189 3053 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3054 /*
fc885189
JB		 3055 * Validate the rate, unless a PLCP error means that
3056 * we probably can't have a valid rate here anyway.
e5d6eb83 3057 */
fc885189
JB		 3058
3059 if (status->flag & RX_FLAG_HT) {
3060 /*
3061 * rate_idx is MCS index, which can be [0-76]
3062 * as documented on:
3063 *
3064 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3065 *
3066 * Anything else would be some sort of driver or
3067 * hardware error. The driver should catch hardware
3068 * errors.
3069 */
3070 if (WARN((status->rate_idx < 0 ||
3071 status->rate_idx > 76),
3072 "Rate marked as an HT rate but passed "
3073 "status->rate_idx is not "
3074 "an MCS index [0-76]: %d (0x%02x)\n",
3075 status->rate_idx,
3076 status->rate_idx))
3077 goto drop;
3078 } else {
3079 if (WARN_ON(status->rate_idx < 0 ||
3080 status->rate_idx >= sband->n_bitrates))
3081 goto drop;
3082 rate = &sband->bitrates[status->rate_idx];
3083 }
0fb8ca45 3084 }
6368e4b1 3085
554891e6
JB		 3086 status->rx_flags = 0;
3087
6368e4b1
RR		 3088 /*
3089 * key references and virtual interfaces are protected using RCU
3090 * and this requires that we are in a read-side RCU section during
3091 * receive processing
3092 */
3093 rcu_read_lock();
3094
3095 /*
3096 * Frames with failed FCS/PLCP checksum are not returned,
3097 * all other frames are returned without radiotap header
3098 * if it was previously present.
3099 * Also, frames with less than 16 bytes are dropped.
3100 */
f1d58c25 3101 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3102 if (!skb) {
3103 rcu_read_unlock();
3104 return;
3105 }
3106
e1e54068
JB		 3107 ieee80211_tpt_led_trig_rx(local,
3108 ((struct ieee80211_hdr *)skb->data)->frame_control,
3109 skb->len);
071d9ac2 3110 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3111
3112 rcu_read_unlock();
77a980dc
JB		 3113
3114 return;
3115 drop:
3116 kfree_skb(skb);
6368e4b1 3117}
103bf9f7 3118EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3119
3120/* This is a version of the rx handler that can be called from hard irq
3121 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3122void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3123{
3124 struct ieee80211_local *local = hw_to_local(hw);
3125
3126 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3127
571ecf67
JB		 3128 skb->pkt_type = IEEE80211_RX_MSG;
3129 skb_queue_tail(&local->skb_queue, skb);
3130 tasklet_schedule(&local->tasklet);
3131}
3132EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)