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mac80211: don't initiate path discovery when forwarding frame with unknown DA
[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"
31
b2e7771e
JB		 32/*
33 * monitor mode reception
34 *
35 * This function cleans up the SKB, i.e. it removes all the stuff
36 * only useful for monitoring.
37 */
38static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 39 struct sk_buff *skb)
b2e7771e 40{
b2e7771e
JB		 41 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
42 if (likely(skb->len > FCS_LEN))
e3cf8b3f 43 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 44 else {
45 /* driver bug */
46 WARN_ON(1);
47 dev_kfree_skb(skb);
48 skb = NULL;
49 }
50 }
51
52 return skb;
53}
54
f1d58c25 55static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 56 int present_fcs_len)
b2e7771e 57{
f1d58c25 58 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 59 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 60
61 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 return 1;
0869aea0 63 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 64 return 1;
87228f57
HH		 65 if (ieee80211_is_ctl(hdr->frame_control) &&
66 !ieee80211_is_pspoll(hdr->frame_control) &&
67 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 68 return 1;
69 return 0;
70}
71
601ae7f2
BR		 72static int
73ieee80211_rx_radiotap_len(struct ieee80211_local *local,
74 struct ieee80211_rx_status *status)
75{
76 int len;
77
78 /* always present fields */
79 len = sizeof(struct ieee80211_radiotap_header) + 9;
80
6ebacbb7 81 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 82 len += 8;
7fee5372 83 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 84 len += 1;
601ae7f2
BR		 85
86 if (len & 1) /* padding for RX_FLAGS if necessary */
87 len++;
88
6d744bac
JB		 89 if (status->flag & RX_FLAG_HT) /* HT info */
90 len += 3;
91
601ae7f2
BR		 92 return len;
93}
94
d1c3a37c 95/*
601ae7f2
BR		 96 * ieee80211_add_rx_radiotap_header - add radiotap header
97 *
98 * add a radiotap header containing all the fields which the hardware provided.
99 */
100static void
101ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
102 struct sk_buff *skb,
601ae7f2
BR		 103 struct ieee80211_rate *rate,
104 int rtap_len)
105{
f1d58c25 106 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 107 struct ieee80211_radiotap_header *rthdr;
108 unsigned char *pos;
6a86b9c7 109 u16 rx_flags = 0;
601ae7f2
BR		 110
111 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
112 memset(rthdr, 0, rtap_len);
113
114 /* radiotap header, set always present flags */
115 rthdr->it_present =
116 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 117 (1 << IEEE80211_RADIOTAP_CHANNEL) |
118 (1 << IEEE80211_RADIOTAP_ANTENNA) |
119 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
120 rthdr->it_len = cpu_to_le16(rtap_len);
121
122 pos = (unsigned char *)(rthdr+1);
123
124 /* the order of the following fields is important */
125
126 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 127 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 128 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 129 rthdr->it_present |=
130 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
131 pos += 8;
132 }
133
134 /* IEEE80211_RADIOTAP_FLAGS */
135 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
136 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 137 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
138 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 139 if (status->flag & RX_FLAG_SHORTPRE)
140 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 141 pos++;
142
143 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 144 if (status->flag & RX_FLAG_HT) {
145 /*
38f37be2 146 * MCS information is a separate field in radiotap,
73b48099
JB		 147 * added below. The byte here is needed as padding
148 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 149 */
150 *pos = 0;
8d6f658e 151 } else {
ebe6c7ba 152 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 153 *pos = rate->bitrate / 5;
8d6f658e 154 }
601ae7f2
BR		 155 pos++;
156
157 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 158 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 159 pos += 2;
160 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 161 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
162 pos);
5f0b7de5
JB		 163 else if (status->flag & RX_FLAG_HT)
164 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
165 pos);
9deb1ae5 166 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 167 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
168 pos);
601ae7f2 169 else
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
171 pos);
601ae7f2
BR		 172 pos += 2;
173
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
176 *pos = status->signal;
177 rthdr->it_present |=
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
179 pos++;
180 }
181
601ae7f2
BR		 182 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
183
184 /* IEEE80211_RADIOTAP_ANTENNA */
185 *pos = status->antenna;
186 pos++;
187
601ae7f2
BR		 188 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
189
190 /* IEEE80211_RADIOTAP_RX_FLAGS */
191 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 192 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 193 pos++;
aae89831 194 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 195 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
196 put_unaligned_le16(rx_flags, pos);
601ae7f2 197 pos += 2;
6d744bac
JB		 198
199 if (status->flag & RX_FLAG_HT) {
200 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
201 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
202 IEEE80211_RADIOTAP_MCS_HAVE_GI |
203 IEEE80211_RADIOTAP_MCS_HAVE_BW;
204 *pos = 0;
205 if (status->flag & RX_FLAG_SHORT_GI)
206 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
207 if (status->flag & RX_FLAG_40MHZ)
208 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
209 pos++;
210 *pos++ = status->rate_idx;
211 }
601ae7f2
BR		 212}
213
b2e7771e
JB		 214/*
215 * This function copies a received frame to all monitor interfaces and
216 * returns a cleaned-up SKB that no longer includes the FCS nor the
217 * radiotap header the driver might have added.
218 */
219static struct sk_buff *
220ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 221 struct ieee80211_rate *rate)
b2e7771e 222{
f1d58c25 223 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 224 struct ieee80211_sub_if_data *sdata;
b2e7771e 225 int needed_headroom = 0;
b2e7771e
JB		 226 struct sk_buff *skb, *skb2;
227 struct net_device *prev_dev = NULL;
228 int present_fcs_len = 0;
b2e7771e
JB		 229
230 /*
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
234 *
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
237 */
0869aea0
JB		 238
239 /* room for the radiotap header based on driver features */
240 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 241
242 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
243 present_fcs_len = FCS_LEN;
244
e3cf8b3f
ZY		 245 /* make sure hdr->frame_control is on the linear part */
246 if (!pskb_may_pull(origskb, 2)) {
247 dev_kfree_skb(origskb);
248 return NULL;
249 }
250
b2e7771e 251 if (!local->monitors) {
0869aea0 252 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
0869aea0 257 return remove_monitor_info(local, origskb);
b2e7771e
JB		 258 }
259
0869aea0 260 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 261 /* only need to expand headroom if necessary */
262 skb = origskb;
263 origskb = NULL;
264
265 /*
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
271 */
272 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 273 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 274 dev_kfree_skb(skb);
275 return NULL;
276 }
277 } else {
278 /*
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
281 */
282 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
283
0869aea0 284 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 285
286 if (!skb)
287 return origskb;
288 }
289
0869aea0
JB		 290 /* prepend radiotap information */
291 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 292
ce3edf6d 293 skb_reset_mac_header(skb);
b2e7771e
JB		 294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 299 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 300 continue;
301
3d30d949
MW		 302 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
303 continue;
304
9607e6b6 305 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 306 continue;
307
b2e7771e
JB		 308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
5548a8a1 312 netif_receive_skb(skb2);
b2e7771e
JB		 313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
5548a8a1 323 netif_receive_skb(skb);
b2e7771e
JB		 324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328}
329
330
5cf121c3 331static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 332{
238f74a2 333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 334 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 335 int tid, seqno_idx, security_idx;
6e0d114d
JB		 336
337 /* does the frame have a qos control field? */
238f74a2
HH		 338 if (ieee80211_is_data_qos(hdr->frame_control)) {
339 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 340 /* frame has qos control */
238f74a2 341 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 342 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 343 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 344
345 seqno_idx = tid;
346 security_idx = tid;
6e0d114d 347 } else {
1411f9b5
JB		 348 /*
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
350 *
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
356 *
357 * We also use that counter for non-QoS STAs.
358 */
9e26297a
JB		 359 seqno_idx = NUM_RX_DATA_QUEUES;
360 security_idx = 0;
361 if (ieee80211_is_mgmt(hdr->frame_control))
362 security_idx = NUM_RX_DATA_QUEUES;
363 tid = 0;
6e0d114d 364 }
52865dfd 365
9e26297a
JB		 366 rx->seqno_idx = seqno_idx;
367 rx->security_idx = security_idx;
6e0d114d
JB		 368 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
369 * For now, set skb->priority to 0 for other cases. */
370 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 371}
6e0d114d 372
d1c3a37c
JB		 373/**
374 * DOC: Packet alignment
375 *
376 * Drivers always need to pass packets that are aligned to two-byte boundaries
377 * to the stack.
378 *
379 * Additionally, should, if possible, align the payload data in a way that
380 * guarantees that the contained IP header is aligned to a four-byte
381 * boundary. In the case of regular frames, this simply means aligning the
382 * payload to a four-byte boundary (because either the IP header is directly
383 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 384 * in front of it). If the payload data is not properly aligned and the
385 * architecture doesn't support efficient unaligned operations, mac80211
386 * will align the data.
d1c3a37c
JB		 387 *
388 * With A-MSDU frames, however, the payload data address must yield two modulo
389 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
390 * push the IP header further back to a multiple of four again. Thankfully, the
391 * specs were sane enough this time around to require padding each A-MSDU
392 * subframe to a length that is a multiple of four.
393 *
25985edc 394 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 395 * the payload is not supported, the driver is required to move the 802.11
396 * header to be directly in front of the payload in that case.
397 */
398static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 399{
59d9cb07
KV		 400#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
401 WARN_ONCE((unsigned long)rx->skb->data & 1,
402 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 403#endif
6e0d114d
JB		 404}
405
6368e4b1 406
571ecf67
JB		 407/* rx handlers */
408
49461622 409static ieee80211_rx_result debug_noinline
5cf121c3 410ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 411{
412 struct ieee80211_local *local = rx->local;
554891e6 413 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 414 struct sk_buff *skb = rx->skb;
415
79f460ca
LC		 416 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
417 !local->sched_scanning))
4080c7cd
JB		 418 return RX_CONTINUE;
419
b23b025f 420 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 421 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
422 local->sched_scanning)
f1d58c25 423 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 424
4080c7cd
JB		 425 /* scanning finished during invoking of handlers */
426 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
427 return RX_DROP_UNUSABLE;
571ecf67
JB		 428}
429
3cfcf6ac
JM		 430
431static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
432{
433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
434
435 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
436 return 0;
437
438 return ieee80211_is_robust_mgmt_frame(hdr);
439}
440
441
442static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
443{
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445
446 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
447 return 0;
448
449 return ieee80211_is_robust_mgmt_frame(hdr);
450}
451
452
453/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
455{
456 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
457 struct ieee80211_mmie *mmie;
458
459 if (skb->len < 24 + sizeof(*mmie) ||
460 !is_multicast_ether_addr(hdr->da))
461 return -1;
462
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
464 return -1; /* not a robust management frame */
465
466 mmie = (struct ieee80211_mmie *)
467 (skb->data + skb->len - sizeof(*mmie));
468 if (mmie->element_id != WLAN_EID_MMIE ||
469 mmie->length != sizeof(*mmie) - 2)
470 return -1;
471
472 return le16_to_cpu(mmie->key_id);
473}
474
475
33b64eb2 476static ieee80211_rx_result
5cf121c3 477ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 478{
a7767f95 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 480 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 481
a7767f95 482 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 483 if (is_multicast_ether_addr(hdr->addr1)) {
484 if (ieee80211_has_tods(hdr->frame_control) ||
485 !ieee80211_has_fromds(hdr->frame_control))
486 return RX_DROP_MONITOR;
487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
488 return RX_DROP_MONITOR;
489 } else {
490 if (!ieee80211_has_a4(hdr->frame_control))
491 return RX_DROP_MONITOR;
492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
493 return RX_DROP_MONITOR;
494 }
33b64eb2
LCC		 495 }
496
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
499 */
500
57cf8043 501 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 502 struct ieee80211_mgmt *mgmt;
d6d1a5a7 503
a7767f95 504 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 505 return RX_DROP_MONITOR;
506
a7767f95 507 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 508 u8 category;
33b64eb2 509 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 510 category = mgmt->u.action.category;
511 if (category != WLAN_CATEGORY_MESH_ACTION &&
512 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 513 return RX_DROP_MONITOR;
33b64eb2 514 return RX_CONTINUE;
33b64eb2
LCC		 515 }
516
a7767f95
HH		 517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 519 ieee80211_is_beacon(hdr->frame_control) ||
520 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 521 return RX_CONTINUE;
522
523 return RX_DROP_MONITOR;
524
525 }
526
902acc78
JB		 527 return RX_CONTINUE;
528}
33b64eb2 529
1edfb1af
JB		 530#define SEQ_MODULO 0x1000
531#define SEQ_MASK 0xfff
532
533static inline int seq_less(u16 sq1, u16 sq2)
534{
535 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
536}
537
538static inline u16 seq_inc(u16 sq)
539{
540 return (sq + 1) & SEQ_MASK;
541}
542
543static inline u16 seq_sub(u16 sq1, u16 sq2)
544{
545 return (sq1 - sq2) & SEQ_MASK;
546}
547
548
549static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
550 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 551 int index)
1edfb1af 552{
24a8fdad 553 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 554 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 555 struct ieee80211_rx_status *status;
1edfb1af 556
dd318575
JB		 557 lockdep_assert_held(&tid_agg_rx->reorder_lock);
558
1edfb1af
JB		 559 if (!skb)
560 goto no_frame;
561
071d9ac2 562 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 563 tid_agg_rx->stored_mpdu_num--;
564 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 565 status = IEEE80211_SKB_RXCB(skb);
566 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 567 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 568
569no_frame:
570 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
571}
572
573static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
574 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 575 u16 head_seq_num)
1edfb1af
JB		 576{
577 int index;
578
dd318575
JB		 579 lockdep_assert_held(&tid_agg_rx->reorder_lock);
580
1edfb1af
JB		 581 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
582 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
583 tid_agg_rx->buf_size;
24a8fdad 584 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 585 }
586}
587
588/*
589 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
590 * the skb was added to the buffer longer than this time ago, the earlier
591 * frames that have not yet been received are assumed to be lost and the skb
592 * can be released for processing. This may also release other skb's from the
593 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 594 *
595 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 596 */
597#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
598
aa0c8636 599static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 600 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 601{
2bff8ebf 602 int index, j;
aa0c8636 603
dd318575
JB		 604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
605
aa0c8636
CL		 606 /* release the buffer until next missing frame */
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
609 if (!tid_agg_rx->reorder_buf[index] &&
610 tid_agg_rx->stored_mpdu_num > 1) {
611 /*
612 * No buffers ready to be released, but check whether any
613 * frames in the reorder buffer have timed out.
614 */
aa0c8636
CL		 615 int skipped = 1;
616 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
617 j = (j + 1) % tid_agg_rx->buf_size) {
618 if (!tid_agg_rx->reorder_buf[j]) {
619 skipped++;
620 continue;
621 }
499fe9a4
DH		 622 if (skipped &&
623 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 624 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 625 goto set_release_timer;
aa0c8636
CL		 626
627#ifdef CONFIG_MAC80211_HT_DEBUG
628 if (net_ratelimit())
0fb9a9ec
JP		 629 wiphy_debug(hw->wiphy,
630 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 631#endif
24a8fdad 632 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 633
634 /*
635 * Increment the head seq# also for the skipped slots.
636 */
637 tid_agg_rx->head_seq_num =
638 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
639 skipped = 0;
640 }
641 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 642 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 643 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
644 tid_agg_rx->buf_size;
645 }
2bff8ebf
CL		 646
647 if (tid_agg_rx->stored_mpdu_num) {
648 j = index = seq_sub(tid_agg_rx->head_seq_num,
649 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
650
651 for (; j != (index - 1) % tid_agg_rx->buf_size;
652 j = (j + 1) % tid_agg_rx->buf_size) {
653 if (tid_agg_rx->reorder_buf[j])
654 break;
655 }
656
657 set_release_timer:
658
659 mod_timer(&tid_agg_rx->reorder_timer,
334df731 660 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 661 HT_RX_REORDER_BUF_TIMEOUT);
662 } else {
663 del_timer(&tid_agg_rx->reorder_timer);
664 }
aa0c8636
CL		 665}
666
1edfb1af
JB		 667/*
668 * As this function belongs to the RX path it must be under
669 * rcu_read_lock protection. It returns false if the frame
670 * can be processed immediately, true if it was consumed.
671 */
672static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
673 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 674 struct sk_buff *skb)
1edfb1af
JB		 675{
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677 u16 sc = le16_to_cpu(hdr->seq_ctrl);
678 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
679 u16 head_seq_num, buf_size;
680 int index;
2bff8ebf 681 bool ret = true;
1edfb1af 682
dd318575
JB		 683 spin_lock(&tid_agg_rx->reorder_lock);
684
1edfb1af
JB		 685 buf_size = tid_agg_rx->buf_size;
686 head_seq_num = tid_agg_rx->head_seq_num;
687
688 /* frame with out of date sequence number */
689 if (seq_less(mpdu_seq_num, head_seq_num)) {
690 dev_kfree_skb(skb);
2bff8ebf 691 goto out;
1edfb1af
JB		 692 }
693
694 /*
695 * If frame the sequence number exceeds our buffering window
696 * size release some previous frames to make room for this one.
697 */
698 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
699 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
700 /* release stored frames up to new head to stack */
24a8fdad 701 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 702 }
703
704 /* Now the new frame is always in the range of the reordering buffer */
705
706 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
707
708 /* check if we already stored this frame */
709 if (tid_agg_rx->reorder_buf[index]) {
710 dev_kfree_skb(skb);
2bff8ebf 711 goto out;
1edfb1af
JB		 712 }
713
714 /*
715 * If the current MPDU is in the right order and nothing else
716 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 717 * If it is first but there's something stored, we may be able
718 * to release frames after this one.
1edfb1af
JB		 719 */
720 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
721 tid_agg_rx->stored_mpdu_num == 0) {
722 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 723 ret = false;
724 goto out;
1edfb1af
JB		 725 }
726
727 /* put the frame in the reordering buffer */
728 tid_agg_rx->reorder_buf[index] = skb;
729 tid_agg_rx->reorder_time[index] = jiffies;
730 tid_agg_rx->stored_mpdu_num++;
24a8fdad 731 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 732
2bff8ebf
CL		 733 out:
734 spin_unlock(&tid_agg_rx->reorder_lock);
735 return ret;
1edfb1af
JB		 736}
737
738/*
739 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
740 * true if the MPDU was buffered, false if it should be processed.
741 */
24a8fdad 742static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 743{
2569a826
JB		 744 struct sk_buff *skb = rx->skb;
745 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 746 struct ieee80211_hw *hw = &local->hw;
747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 749 struct sta_info *sta = rx->sta;
1edfb1af
JB		 750 struct tid_ampdu_rx *tid_agg_rx;
751 u16 sc;
6cc00d54 752 u8 tid, ack_policy;
1edfb1af
JB		 753
754 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 755 goto dont_reorder;
1edfb1af
JB		 756
757 /*
758 * filter the QoS data rx stream according to
759 * STA/TID and check if this STA/TID is on aggregation
760 */
761
1edfb1af 762 if (!sta)
2569a826 763 goto dont_reorder;
1edfb1af 764
6cc00d54
TP		 765 ack_policy = *ieee80211_get_qos_ctl(hdr) &
766 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 767 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
768
a87f736d
JB		 769 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
770 if (!tid_agg_rx)
771 goto dont_reorder;
1edfb1af
JB		 772
773 /* qos null data frames are excluded */
774 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 775 goto dont_reorder;
1edfb1af 776
6cc00d54
TP		 777 /* not part of a BA session */
778 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
779 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
780 goto dont_reorder;
781
660c6a44
TP		 782 /* not actually part of this BA session */
783 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
784 goto dont_reorder;
785
1edfb1af
JB		 786 /* new, potentially un-ordered, ampdu frame - process it */
787
788 /* reset session timer */
789 if (tid_agg_rx->timeout)
790 mod_timer(&tid_agg_rx->session_timer,
791 TU_TO_EXP_TIME(tid_agg_rx->timeout));
792
793 /* if this mpdu is fragmented - terminate rx aggregation session */
794 sc = le16_to_cpu(hdr->seq_ctrl);
795 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 796 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 797 skb_queue_tail(&rx->sdata->skb_queue, skb);
798 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 799 return;
1edfb1af
JB		 800 }
801
a87f736d
JB		 802 /*
803 * No locking needed -- we will only ever process one
804 * RX packet at a time, and thus own tid_agg_rx. All
805 * other code manipulating it needs to (and does) make
806 * sure that we cannot get to it any more before doing
807 * anything with it.
808 */
24a8fdad 809 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 810 return;
811
812 dont_reorder:
24a8fdad 813 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 814}
33b64eb2 815
49461622 816static ieee80211_rx_result debug_noinline
5cf121c3 817ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 818{
a7767f95 819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 820 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 821
822 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
823 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 824 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 825 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 826 hdr->seq_ctrl)) {
554891e6 827 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 828 rx->local->dot11FrameDuplicateCount++;
829 rx->sta->num_duplicates++;
830 }
b1f93314 831 return RX_DROP_UNUSABLE;
571ecf67 832 } else
9e26297a 833 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 834 }
835
571ecf67
JB		 836 if (unlikely(rx->skb->len < 16)) {
837 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 838 return RX_DROP_MONITOR;
571ecf67
JB		 839 }
840
571ecf67
JB		 841 /* Drop disallowed frame classes based on STA auth/assoc state;
842 * IEEE 802.11, Chap 5.5.
843 *
ccd7b362
JB		 844 * mac80211 filters only based on association state, i.e. it drops
845 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 846 * deauth/disassoc frames when needed. In addition, hostapd is
847 * responsible for filtering on both auth and assoc states.
848 */
33b64eb2 849
902acc78 850 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 851 return ieee80211_rx_mesh_check(rx);
33b64eb2 852
a7767f95
HH		 853 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
854 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 855 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 856 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 857 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
2a33bee2
GE		 858 if (rx->sta && rx->sta->dummy &&
859 ieee80211_is_data_present(hdr->frame_control)) {
860 u16 ethertype;
861 u8 *payload;
862
863 payload = rx->skb->data +
864 ieee80211_hdrlen(hdr->frame_control);
865 ethertype = (payload[6] << 8) | payload[7];
866 if (cpu_to_be16(ethertype) ==
867 rx->sdata->control_port_protocol)
868 return RX_CONTINUE;
869 }
21fc7560
JB		 870
871 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
872 cfg80211_rx_spurious_frame(rx->sdata->dev,
873 hdr->addr2,
874 GFP_ATOMIC))
875 return RX_DROP_UNUSABLE;
876
e4c26add 877 return RX_DROP_MONITOR;
2a33bee2 878 }
571ecf67 879
9ae54c84 880 return RX_CONTINUE;
570bd537
JB		 881}
882
883
49461622 884static ieee80211_rx_result debug_noinline
5cf121c3 885ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 886{
eb9fb5b8
JB		 887 struct sk_buff *skb = rx->skb;
888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
889 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 890 int keyidx;
891 int hdrlen;
e4c26add 892 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 893 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 894 int mmie_keyidx = -1;
761ab470 895 __le16 fc;
570bd537 896
3017b80b
JB		 897 /*
898 * Key selection 101
899 *
3cfcf6ac 900 * There are four types of keys:
3017b80b 901 * - GTK (group keys)
3cfcf6ac 902 * - IGTK (group keys for management frames)
3017b80b
JB		 903 * - PTK (pairwise keys)
904 * - STK (station-to-station pairwise keys)
905 *
906 * When selecting a key, we have to distinguish between multicast
907 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 908 * use PTKs and STKs while the former always use GTKs and IGTKs.
909 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
910 * unicast frames can also use key indices like GTKs. Hence, if we
911 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 912 *
8dc06a1c
JB		 913 * Note that in a regular BSS, multicast frames are sent by the
914 * AP only, associated stations unicast the frame to the AP first
915 * which then multicasts it on their behalf.
916 *
3017b80b
JB		 917 * There is also a slight problem in IBSS mode: GTKs are negotiated
918 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 919 * The spec seems to expect that one negotiates the same key with
920 * every station but there's no such requirement; VLANs could be
921 * possible.
3017b80b
JB		 922 */
923
3017b80b 924 /*
1990af8d 925 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 926 * addressed to us nor a multicast frame.
927 */
554891e6 928 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 929 return RX_CONTINUE;
3017b80b 930
2569a826
JB		 931 /* start without a key */
932 rx->key = NULL;
933
d4e46a3d 934 if (rx->sta)
e31b8213 935 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 936
761ab470
JB		 937 fc = hdr->frame_control;
938
939 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 940 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
941
e31b8213
JB		 942 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
943 rx->key = sta_ptk;
dc1580dd
JB		 944 if ((status->flag & RX_FLAG_DECRYPTED) &&
945 (status->flag & RX_FLAG_IV_STRIPPED))
946 return RX_CONTINUE;
0c7c10c7 947 /* Skip decryption if the frame is not protected. */
761ab470 948 if (!ieee80211_has_protected(fc))
0c7c10c7 949 return RX_CONTINUE;
3cfcf6ac
JM		 950 } else if (mmie_keyidx >= 0) {
951 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 952 if ((status->flag & RX_FLAG_DECRYPTED) &&
953 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 954 return RX_CONTINUE;
955
956 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
957 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
958 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 959 if (rx->sta)
960 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
961 if (!rx->key)
962 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 963 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 964 /*
965 * The frame was not protected, so skip decryption. However, we
966 * need to set rx->key if there is a key that could have been
967 * used so that the frame may be dropped if encryption would
968 * have been expected.
969 */
970 struct ieee80211_key *key = NULL;
897bed8b
JB		 971 struct ieee80211_sub_if_data *sdata = rx->sdata;
972 int i;
973
761ab470 974 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 975 is_multicast_ether_addr(hdr->addr1) &&
976 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
977 rx->key = key;
897bed8b
JB		 978 else {
979 if (rx->sta) {
980 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
981 key = rcu_dereference(rx->sta->gtk[i]);
982 if (key)
983 break;
984 }
985 }
986 if (!key) {
987 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
988 key = rcu_dereference(sdata->keys[i]);
989 if (key)
990 break;
991 }
992 }
993 if (key)
994 rx->key = key;
995 }
0c7c10c7 996 return RX_CONTINUE;
571ecf67 997 } else {
39184b15 998 u8 keyid;
3017b80b
JB		 999 /*
1000 * The device doesn't give us the IV so we won't be
1001 * able to look up the key. That's ok though, we
1002 * don't need to decrypt the frame, we just won't
1003 * be able to keep statistics accurate.
1004 * Except for key threshold notifications, should
1005 * we somehow allow the driver to tell us which key
1006 * the hardware used if this flag is set?
1007 */
eb9fb5b8
JB		 1008 if ((status->flag & RX_FLAG_DECRYPTED) &&
1009 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1010 return RX_CONTINUE;
3017b80b 1011
761ab470 1012 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1013
1014 if (rx->skb->len < 8 + hdrlen)
e4c26add 1015 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1016
1017 /*
1018 * no need to call ieee80211_wep_get_keyidx,
1019 * it verifies a bunch of things we've done already
1020 */
39184b15
ZY		 1021 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1022 keyidx = keyid >> 6;
3017b80b 1023
e31b8213
JB		 1024 /* check per-station GTK first, if multicast packet */
1025 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1026 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1027
e31b8213
JB		 1028 /* if not found, try default key */
1029 if (!rx->key) {
1030 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1031
1032 /*
1033 * RSNA-protected unicast frames should always be
1034 * sent with pairwise or station-to-station keys,
1035 * but for WEP we allow using a key index as well.
1036 */
1037 if (rx->key &&
1038 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1039 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1040 !is_multicast_ether_addr(hdr->addr1))
1041 rx->key = NULL;
1042 }
571ecf67
JB		 1043 }
1044
3017b80b 1045 if (rx->key) {
95acac61
JB		 1046 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1047 return RX_DROP_MONITOR;
1048
571ecf67 1049 rx->key->tx_rx_count++;
011bfcc4 1050 /* TODO: add threshold stuff again */
1990af8d 1051 } else {
e4c26add 1052 return RX_DROP_MONITOR;
70f08765
JB		 1053 }
1054
39184b15
ZY		 1055 if (skb_linearize(rx->skb))
1056 return RX_DROP_UNUSABLE;
761ab470 1057 /* the hdr variable is invalid now! */
1990af8d 1058
97359d12
JB		 1059 switch (rx->key->conf.cipher) {
1060 case WLAN_CIPHER_SUITE_WEP40:
1061 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1062 /* Check for weak IVs if possible */
1063 if (rx->sta && ieee80211_is_data(fc) &&
1064 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1065 !(status->flag & RX_FLAG_DECRYPTED)) &&
1066 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1067 rx->sta->wep_weak_iv_count++;
1068
e2f036da
MN		 1069 result = ieee80211_crypto_wep_decrypt(rx);
1070 break;
97359d12 1071 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1072 result = ieee80211_crypto_tkip_decrypt(rx);
1073 break;
97359d12 1074 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1075 result = ieee80211_crypto_ccmp_decrypt(rx);
1076 break;
97359d12 1077 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1078 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1079 break;
3ffc2a90
JB		 1080 default:
1081 /*
1082 * We can reach here only with HW-only algorithms
1083 * but why didn't it decrypt the frame?!
1084 */
1085 return RX_DROP_UNUSABLE;
70f08765
JB		 1086 }
1087
e2f036da 1088 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1089 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1090
1091 return result;
70f08765
JB		 1092}
1093
572e0012
KV		 1094static ieee80211_rx_result debug_noinline
1095ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1096{
1097 struct ieee80211_local *local;
1098 struct ieee80211_hdr *hdr;
1099 struct sk_buff *skb;
1100
1101 local = rx->local;
1102 skb = rx->skb;
1103 hdr = (struct ieee80211_hdr *) skb->data;
1104
1105 if (!local->pspolling)
1106 return RX_CONTINUE;
1107
1108 if (!ieee80211_has_fromds(hdr->frame_control))
1109 /* this is not from AP */
1110 return RX_CONTINUE;
1111
1112 if (!ieee80211_is_data(hdr->frame_control))
1113 return RX_CONTINUE;
1114
1115 if (!ieee80211_has_moredata(hdr->frame_control)) {
1116 /* AP has no more frames buffered for us */
1117 local->pspolling = false;
1118 return RX_CONTINUE;
1119 }
1120
1121 /* more data bit is set, let's request a new frame from the AP */
1122 ieee80211_send_pspoll(local, rx->sdata);
1123
1124 return RX_CONTINUE;
1125}
1126
133b8226 1127static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1128{
133b8226 1129 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1130 struct ieee80211_local *local = sdata->local;
0795af57 1131
3e122be0 1132 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1133 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1134 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1135 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1136#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1137 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1138 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1139#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1140}
1141
ff9458d3 1142static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1143{
133b8226 1144 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1145
3e122be0 1146 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1147
571ecf67 1148#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1149 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1150 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",
47846c9b 1156 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
49461622 1575static ieee80211_rx_result debug_noinline
5cf121c3 1576ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1577{
6e0d114d 1578 u8 *data = rx->skb->data;
238f74a2 1579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1580
238f74a2 1581 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1582 return RX_CONTINUE;
6e0d114d
JB		 1583
1584 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1585 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1586 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1587 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1588 /* change frame type to non QOS */
238f74a2 1589 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1590
9ae54c84 1591 return RX_CONTINUE;
6e0d114d
JB		 1592}
1593
76ee65bf 1594static int
5cf121c3 1595ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1596{
07346f81 1597 if (unlikely(!rx->sta ||
c2c98fde 1598 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1599 return -EACCES;
571ecf67 1600
76ee65bf 1601 return 0;
571ecf67
JB		 1602}
1603
76ee65bf 1604static int
358c8d9d 1605ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1606{
eb9fb5b8
JB		 1607 struct sk_buff *skb = rx->skb;
1608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1609
3017b80b 1610 /*
7848ba7d
JB		 1611 * Pass through unencrypted frames if the hardware has
1612 * decrypted them already.
3017b80b 1613 */
eb9fb5b8 1614 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1615 return 0;
571ecf67
JB		 1616
1617 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1618 if (unlikely(!ieee80211_has_protected(fc) &&
1619 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1620 ieee80211_is_data(fc) &&
b3fc9c6c 1621 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1622 return -EACCES;
bef5d1c7
JB		 1623
1624 return 0;
1625}
1626
1627static int
1628ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1629{
1630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1631 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1632 __le16 fc = hdr->frame_control;
bef5d1c7 1633
e3efca0a
JM		 1634 /*
1635 * Pass through unencrypted frames if the hardware has
1636 * decrypted them already.
1637 */
1638 if (status->flag & RX_FLAG_DECRYPTED)
1639 return 0;
bef5d1c7 1640
c2c98fde 1641 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1642 if (unlikely(!ieee80211_has_protected(fc) &&
1643 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1644 rx->key)) {
1645 if (ieee80211_is_deauth(fc))
1646 cfg80211_send_unprot_deauth(rx->sdata->dev,
1647 rx->skb->data,
1648 rx->skb->len);
1649 else if (ieee80211_is_disassoc(fc))
1650 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1651 rx->skb->data,
1652 rx->skb->len);
f2ca3ea4 1653 return -EACCES;
cf4e594e 1654 }
f2ca3ea4 1655 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1656 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1657 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1658 if (ieee80211_is_deauth(fc))
1659 cfg80211_send_unprot_deauth(rx->sdata->dev,
1660 rx->skb->data,
1661 rx->skb->len);
1662 else if (ieee80211_is_disassoc(fc))
1663 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1664 rx->skb->data,
1665 rx->skb->len);
f2ca3ea4 1666 return -EACCES;
cf4e594e 1667 }
f2ca3ea4
JM		 1668 /*
1669 * When using MFP, Action frames are not allowed prior to
1670 * having configured keys.
1671 */
1672 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1673 ieee80211_is_robust_mgmt_frame(
1674 (struct ieee80211_hdr *) rx->skb->data)))
1675 return -EACCES;
1676 }
b3fc9c6c 1677
76ee65bf 1678 return 0;
571ecf67
JB		 1679}
1680
76ee65bf 1681static int
4114fa21 1682__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1683{
eb9fb5b8 1684 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1686 bool check_port_control = false;
1687 struct ethhdr *ehdr;
1688 int ret;
f14543ee 1689
4114fa21 1690 *port_control = false;
9bc383de
JB		 1691 if (ieee80211_has_a4(hdr->frame_control) &&
1692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1693 return -1;
9bc383de 1694
fbb327c5
FF		 1695 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1696 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1697
1698 if (!sdata->u.mgd.use_4addr)
1699 return -1;
1700 else
1701 check_port_control = true;
1702 }
1703
9bc383de 1704 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1705 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1706 return -1;
571ecf67 1707
fbb327c5 1708 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1709 if (ret < 0)
fbb327c5
FF		 1710 return ret;
1711
1712 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1713 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1714 *port_control = true;
1715 else if (check_port_control)
fbb327c5
FF		 1716 return -1;
1717
1718 return 0;
76ee65bf 1719}
571ecf67 1720
ce3edf6d
JB		 1721/*
1722 * requires that rx->skb is a frame with ethernet header
1723 */
358c8d9d 1724static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1725{
c97c23e3 1726 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1727 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1728 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1729
1730 /*
1731 * Allow EAPOL frames to us/the PAE group address regardless
1732 * of whether the frame was encrypted or not.
1733 */
a621fa4d 1734 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1735 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1736 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1737 return true;
1738
1739 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1740 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1741 return false;
1742
1743 return true;
1744}
1745
1746/*
1747 * requires that rx->skb is a frame with ethernet header
1748 */
76ee65bf 1749static void
5cf121c3 1750ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1751{
eb9fb5b8
JB		 1752 struct ieee80211_sub_if_data *sdata = rx->sdata;
1753 struct net_device *dev = sdata->dev;
76ee65bf 1754 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1755 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1756 struct sta_info *dsta;
554891e6 1757 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1758
76ee65bf
RR		 1759 skb = rx->skb;
1760 xmit_skb = NULL;
571ecf67 1761
05c914fe
JB		 1762 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1763 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1764 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1765 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1766 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1767 if (is_multicast_ether_addr(ehdr->h_dest)) {
1768 /*
1769 * send multicast frames both to higher layers in
1770 * local net stack and back to the wireless medium
1771 */
76ee65bf
RR		 1772 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1773 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1774 printk(KERN_DEBUG "%s: failed to clone "
1775 "multicast frame\n", dev->name);
1776 } else {
abe60632
JB		 1777 dsta = sta_info_get(sdata, skb->data);
1778 if (dsta) {
ce3edf6d
JB		 1779 /*
1780 * The destination station is associated to
1781 * this AP (in this VLAN), so send the frame
1782 * directly to it and do not pass it to local
1783 * net stack.
571ecf67 1784 */
76ee65bf 1785 xmit_skb = skb;
571ecf67
JB		 1786 skb = NULL;
1787 }
571ecf67
JB		 1788 }
1789 }
1790
1791 if (skb) {
d1c3a37c
JB		 1792 int align __maybe_unused;
1793
59d9cb07 1794#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1795 /*
1796 * 'align' will only take the values 0 or 2 here
1797 * since all frames are required to be aligned
1798 * to 2-byte boundaries when being passed to
1799 * mac80211. That also explains the __skb_push()
1800 * below.
1801 */
dacb6f1d 1802 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1803 if (align) {
1804 if (WARN_ON(skb_headroom(skb) < 3)) {
1805 dev_kfree_skb(skb);
1806 skb = NULL;
1807 } else {
1808 u8 *data = skb->data;
8ce0b589
ZY		 1809 size_t len = skb_headlen(skb);
1810 skb->data -= align;
1811 memmove(skb->data, data, len);
1812 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1813 }
1814 }
1815#endif
1816
1817 if (skb) {
1818 /* deliver to local stack */
1819 skb->protocol = eth_type_trans(skb, dev);
1820 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1821 netif_receive_skb(skb);
d1c3a37c 1822 }
571ecf67
JB		 1823 }
1824
76ee65bf 1825 if (xmit_skb) {
571ecf67 1826 /* send to wireless media */
f831e909 1827 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1828 skb_reset_network_header(xmit_skb);
1829 skb_reset_mac_header(xmit_skb);
76ee65bf 1830 dev_queue_xmit(xmit_skb);
571ecf67 1831 }
76ee65bf
RR		 1832}
1833
49461622 1834static ieee80211_rx_result debug_noinline
5cf121c3 1835ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1836{
eb9fb5b8 1837 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1838 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1839 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1840 __le16 fc = hdr->frame_control;
eaf85ca7 1841 struct sk_buff_head frame_list;
554891e6 1842 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1843
358c8d9d 1844 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1845 return RX_CONTINUE;
fd4c7f2f 1846
358c8d9d 1847 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1848 return RX_DROP_MONITOR;
fd4c7f2f 1849
554891e6 1850 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1851 return RX_CONTINUE;
fd4c7f2f 1852
eaf85ca7
ZY		 1853 if (ieee80211_has_a4(hdr->frame_control) &&
1854 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1855 !rx->sdata->u.vlan.sta)
e4c26add 1856 return RX_DROP_UNUSABLE;
fd4c7f2f 1857
eaf85ca7
ZY		 1858 if (is_multicast_ether_addr(hdr->addr1) &&
1859 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1860 rx->sdata->u.vlan.sta) ||
1861 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1862 rx->sdata->u.mgd.use_4addr)))
e4c26add 1863 return RX_DROP_UNUSABLE;
fd4c7f2f 1864
eaf85ca7
ZY		 1865 skb->dev = dev;
1866 __skb_queue_head_init(&frame_list);
fd4c7f2f 1867
e3cf8b3f
ZY		 1868 if (skb_linearize(skb))
1869 return RX_DROP_UNUSABLE;
1870
eaf85ca7
ZY		 1871 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1872 rx->sdata->vif.type,
8b3becad 1873 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1874
eaf85ca7
ZY		 1875 while (!skb_queue_empty(&frame_list)) {
1876 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1877
358c8d9d 1878 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1879 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1880 continue;
1881 }
eaf85ca7
ZY		 1882 dev->stats.rx_packets++;
1883 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1884
1885 ieee80211_deliver_skb(rx);
1886 }
1887
9ae54c84 1888 return RX_QUEUED;
fd4c7f2f
RR		 1889}
1890
bf94e17b 1891#ifdef CONFIG_MAC80211_MESH
b0dee578 1892static ieee80211_rx_result
e32f85f7
LCC		 1893ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1894{
1895 struct ieee80211_hdr *hdr;
1896 struct ieee80211s_hdr *mesh_hdr;
1897 unsigned int hdrlen;
1898 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1899 struct ieee80211_local *local = rx->local;
eb9fb5b8 1900 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1901 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
0cfda851 1902 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
d3c1597b 1903 u16 q;
e32f85f7
LCC		 1904
1905 hdr = (struct ieee80211_hdr *) skb->data;
1906 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1907 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1908
2157fdd6
TP		 1909 /* frame is in RMC, don't forward */
1910 if (ieee80211_is_data(hdr->frame_control) &&
1911 is_multicast_ether_addr(hdr->addr1) &&
1912 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1913 return RX_DROP_MONITOR;
1914
e32f85f7
LCC		 1915 if (!ieee80211_is_data(hdr->frame_control))
1916 return RX_CONTINUE;
1917
1918 if (!mesh_hdr->ttl)
1919 /* illegal frame */
1920 return RX_DROP_MONITOR;
1921
43b7b314 1922 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1923 struct mesh_path *mppath;
43b7b314
JC		 1924 char *proxied_addr;
1925 char *mpp_addr;
1926
1927 if (is_multicast_ether_addr(hdr->addr1)) {
1928 mpp_addr = hdr->addr3;
1929 proxied_addr = mesh_hdr->eaddr1;
1930 } else {
1931 mpp_addr = hdr->addr4;
1932 proxied_addr = mesh_hdr->eaddr2;
1933 }
79617dee 1934
79617dee 1935 rcu_read_lock();
43b7b314 1936 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1937 if (!mppath) {
43b7b314 1938 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1939 } else {
1940 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1941 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1942 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1943 spin_unlock_bh(&mppath->state_lock);
1944 }
1945 rcu_read_unlock();
1946 }
1947
3c5772a5
JC		 1948 /* Frame has reached destination. Don't forward */
1949 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1950 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1951 return RX_CONTINUE;
1952
d3c1597b
TP		 1953 q = ieee80211_select_queue_80211(local, skb, hdr);
1954 if (ieee80211_queue_stopped(&local->hw, q)) {
1955 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1956 dropped_frames_congestion);
1957 return RX_DROP_MONITOR;
1958 }
1959 skb_set_queue_mapping(skb, q);
e32f85f7
LCC		 1960 mesh_hdr->ttl--;
1961
554891e6 1962 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1963 if (!mesh_hdr->ttl)
472dbc45 1964 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1965 dropped_frames_ttl);
1966 else {
1967 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1968 struct ieee80211_tx_info *info;
1969
e32f85f7
LCC		 1970 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1971
1972 if (!fwd_skb && net_ratelimit())
1973 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1974 sdata->name);
919bbad5 1975 if (!fwd_skb)
b51aff05 1976 goto out;
e32f85f7
LCC		 1977
1978 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
3b8d81e0
JB		 1979 info = IEEE80211_SKB_CB(fwd_skb);
1980 memset(info, 0, sizeof(*info));
1981 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1982 info->control.vif = &rx->sdata->vif;
d0ce1855 1983 info->control.jiffies = jiffies;
4777be41 1984 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
c8a61a7d
DW		 1985 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1986 fwded_mcast);
7e3c8866 1987 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
4777be41 1988 } else {
0cfda851
TP		 1989 if (mesh_nexthop_lookup(fwd_skb, sdata)) {
1990 /* can't resolve next hop, send a PERR */
1991 mesh_path_error_tx(sdata->u.mesh.mshcfg.element_ttl,
1992 fwd_hdr->addr3, 0, reason,
1993 fwd_hdr->addr2, sdata);
1994 sdata->u.mesh.mshstats.dropped_frames_no_route++;
249b405c 1995 return RX_DROP_MONITOR;
0cfda851 1996 }
c8a61a7d
DW		 1997
1998 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1999 fwded_unicast);
249b405c
JC		 2000 }
2001 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
2002 fwded_frames);
3b8d81e0 2003 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 2004 }
2005 }
2006
b51aff05 2007 out:
3c5772a5 2008 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2009 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2010 return RX_CONTINUE;
2011 else
2012 return RX_DROP_MONITOR;
2013}
bf94e17b 2014#endif
e32f85f7 2015
49461622 2016static ieee80211_rx_result debug_noinline
5cf121c3 2017ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2018{
eb9fb5b8 2019 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2020 struct ieee80211_local *local = rx->local;
eb9fb5b8 2021 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2022 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2023 __le16 fc = hdr->frame_control;
4114fa21 2024 bool port_control;
ce3edf6d 2025 int err;
76ee65bf 2026
358c8d9d 2027 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2028 return RX_CONTINUE;
76ee65bf 2029
358c8d9d 2030 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2031 return RX_DROP_MONITOR;
76ee65bf 2032
f14543ee 2033 /*
e7f4a940
JB		 2034 * Send unexpected-4addr-frame event to hostapd. For older versions,
2035 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2036 */
2037 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2038 sdata->vif.type == NL80211_IFTYPE_AP) {
2039 if (rx->sta &&
2040 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2041 cfg80211_rx_unexpected_4addr_frame(
2042 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2043 return RX_DROP_MONITOR;
e7f4a940 2044 }
f14543ee 2045
4114fa21 2046 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2047 if (unlikely(err))
e4c26add 2048 return RX_DROP_UNUSABLE;
76ee65bf 2049
358c8d9d 2050 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2051 return RX_DROP_MONITOR;
ce3edf6d 2052
4114fa21
FF		 2053 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2054 unlikely(port_control) && sdata->bss) {
2055 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2056 u.ap);
2057 dev = sdata->dev;
2058 rx->sdata = sdata;
2059 }
2060
76ee65bf
RR		 2061 rx->skb->dev = dev;
2062
2063 dev->stats.rx_packets++;
2064 dev->stats.rx_bytes += rx->skb->len;
2065
08ca944e 2066 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2067 !is_multicast_ether_addr(
2068 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2069 (!local->scanning &&
2070 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2071 mod_timer(&local->dynamic_ps_timer, jiffies +
2072 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2073 }
2074
76ee65bf 2075 ieee80211_deliver_skb(rx);
571ecf67 2076
9ae54c84 2077 return RX_QUEUED;
571ecf67
JB		 2078}
2079
49461622 2080static ieee80211_rx_result debug_noinline
24a8fdad 2081ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2082{
2083 struct ieee80211_local *local = rx->local;
2084 struct ieee80211_hw *hw = &local->hw;
2085 struct sk_buff *skb = rx->skb;
a7767f95 2086 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2087 struct tid_ampdu_rx *tid_agg_rx;
2088 u16 start_seq_num;
2089 u16 tid;
2090
a7767f95 2091 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2092 return RX_CONTINUE;
71364716 2093
a7767f95 2094 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2095 struct {
2096 __le16 control, start_seq_num;
2097 } __packed bar_data;
2098
71364716 2099 if (!rx->sta)
a02ae758 2100 return RX_DROP_MONITOR;
8ae5977f
JB		 2101
2102 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2103 &bar_data, sizeof(bar_data)))
2104 return RX_DROP_MONITOR;
2105
8ae5977f 2106 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2107
2108 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2109 if (!tid_agg_rx)
a02ae758 2110 return RX_DROP_MONITOR;
71364716 2111
8ae5977f 2112 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2113
2114 /* reset session timer */
20ad19d0
JB		 2115 if (tid_agg_rx->timeout)
2116 mod_timer(&tid_agg_rx->session_timer,
2117 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2118
dd318575 2119 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2120 /* release stored frames up to start of BAR */
24a8fdad 2121 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2122 spin_unlock(&tid_agg_rx->reorder_lock);
2123
a02ae758
JB		 2124 kfree_skb(skb);
2125 return RX_QUEUED;
71364716
RR		 2126 }
2127
08daecae
JB		 2128 /*
2129 * After this point, we only want management frames,
2130 * so we can drop all remaining control frames to
2131 * cooked monitor interfaces.
2132 */
2133 return RX_DROP_MONITOR;
71364716
RR		 2134}
2135
f4f727a6
JM		 2136static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2137 struct ieee80211_mgmt *mgmt,
2138 size_t len)
fea14732
JM		 2139{
2140 struct ieee80211_local *local = sdata->local;
2141 struct sk_buff *skb;
2142 struct ieee80211_mgmt *resp;
2143
47846c9b 2144 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2145 /* Not to own unicast address */
2146 return;
2147 }
2148
46900298
JB		 2149 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2150 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2151 /* Not from the current AP or not associated yet. */
fea14732
JM		 2152 return;
2153 }
2154
2155 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2156 /* Too short SA Query request frame */
2157 return;
2158 }
2159
2160 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2161 if (skb == NULL)
2162 return;
2163
2164 skb_reserve(skb, local->hw.extra_tx_headroom);
2165 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2166 memset(resp, 0, 24);
2167 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2168 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2169 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2170 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2171 IEEE80211_STYPE_ACTION);
2172 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2173 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2174 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2175 memcpy(resp->u.action.u.sa_query.trans_id,
2176 mgmt->u.action.u.sa_query.trans_id,
2177 WLAN_SA_QUERY_TR_ID_LEN);
2178
62ae67be 2179 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2180}
2181
2e161f78
JB		 2182static ieee80211_rx_result debug_noinline
2183ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2184{
2185 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2186 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2187
2188 /*
2189 * From here on, look only at management frames.
2190 * Data and control frames are already handled,
2191 * and unknown (reserved) frames are useless.
2192 */
2193 if (rx->skb->len < 24)
2194 return RX_DROP_MONITOR;
2195
2196 if (!ieee80211_is_mgmt(mgmt->frame_control))
2197 return RX_DROP_MONITOR;
2198
ee971924
JB		 2199 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2200 ieee80211_is_beacon(mgmt->frame_control) &&
2201 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2202 struct ieee80211_rx_status *status;
2203
2204 status = IEEE80211_SKB_RXCB(rx->skb);
2205 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2206 rx->skb->data, rx->skb->len,
2207 status->freq, GFP_ATOMIC);
2208 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2209 }
2210
554891e6 2211 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2212 return RX_DROP_MONITOR;
2213
2214 if (ieee80211_drop_unencrypted_mgmt(rx))
2215 return RX_DROP_UNUSABLE;
2216
2217 return RX_CONTINUE;
2218}
2219
de1ede7a
JB		 2220static ieee80211_rx_result debug_noinline
2221ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2222{
2223 struct ieee80211_local *local = rx->local;
eb9fb5b8 2224 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2225 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2227 int len = rx->skb->len;
2228
2229 if (!ieee80211_is_action(mgmt->frame_control))
2230 return RX_CONTINUE;
2231
026331c4
JM		 2232 /* drop too small frames */
2233 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2234 return RX_DROP_UNUSABLE;
de1ede7a 2235
026331c4 2236 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2237 return RX_DROP_UNUSABLE;
de1ede7a 2238
554891e6 2239 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2240 return RX_DROP_UNUSABLE;
97ebe12a 2241
de1ede7a
JB		 2242 switch (mgmt->u.action.category) {
2243 case WLAN_CATEGORY_BACK:
8abd3f9b 2244 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2245 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b
JB		 2246 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2247 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2248 break;
8abd3f9b 2249
026331c4
JM		 2250 /* verify action_code is present */
2251 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2252 break;
2253
de1ede7a
JB		 2254 switch (mgmt->u.action.u.addba_req.action_code) {
2255 case WLAN_ACTION_ADDBA_REQ:
2256 if (len < (IEEE80211_MIN_ACTION_SIZE +
2257 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2258 goto invalid;
2259 break;
de1ede7a
JB		 2260 case WLAN_ACTION_ADDBA_RESP:
2261 if (len < (IEEE80211_MIN_ACTION_SIZE +
2262 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2263 goto invalid;
2264 break;
de1ede7a
JB		 2265 case WLAN_ACTION_DELBA:
2266 if (len < (IEEE80211_MIN_ACTION_SIZE +
2267 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2268 goto invalid;
2269 break;
2270 default:
2271 goto invalid;
de1ede7a 2272 }
bed7ee6e 2273
8b58ff83 2274 goto queue;
39192c0b
JB		 2275 case WLAN_CATEGORY_SPECTRUM_MGMT:
2276 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2277 break;
46900298
JB		 2278
2279 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2280 break;
46900298 2281
026331c4
JM		 2282 /* verify action_code is present */
2283 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2284 break;
2285
39192c0b
JB		 2286 switch (mgmt->u.action.u.measurement.action_code) {
2287 case WLAN_ACTION_SPCT_MSR_REQ:
2288 if (len < (IEEE80211_MIN_ACTION_SIZE +
2289 sizeof(mgmt->u.action.u.measurement)))
84040805 2290 break;
39192c0b 2291 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2292 goto handled;
c481ec97
S		 2293 case WLAN_ACTION_SPCT_CHL_SWITCH:
2294 if (len < (IEEE80211_MIN_ACTION_SIZE +
2295 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2296 break;
c481ec97 2297
cc32abd4 2298 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2299 break;
cc32abd4 2300
46900298 2301 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2302 break;
c481ec97 2303
8b58ff83 2304 goto queue;
39192c0b
JB		 2305 }
2306 break;
fea14732
JM		 2307 case WLAN_CATEGORY_SA_QUERY:
2308 if (len < (IEEE80211_MIN_ACTION_SIZE +
2309 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2310 break;
2311
fea14732
JM		 2312 switch (mgmt->u.action.u.sa_query.action) {
2313 case WLAN_ACTION_SA_QUERY_REQUEST:
2314 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2315 break;
fea14732 2316 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2317 goto handled;
fea14732
JM		 2318 }
2319 break;
8db09850
TP		 2320 case WLAN_CATEGORY_SELF_PROTECTED:
2321 switch (mgmt->u.action.u.self_prot.action_code) {
2322 case WLAN_SP_MESH_PEERING_OPEN:
2323 case WLAN_SP_MESH_PEERING_CLOSE:
2324 case WLAN_SP_MESH_PEERING_CONFIRM:
2325 if (!ieee80211_vif_is_mesh(&sdata->vif))
2326 goto invalid;
2327 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2328 /* userspace handles this frame */
2329 break;
2330 goto queue;
2331 case WLAN_SP_MGK_INFORM:
2332 case WLAN_SP_MGK_ACK:
2333 if (!ieee80211_vif_is_mesh(&sdata->vif))
2334 goto invalid;
2335 break;
2336 }
2337 break;
d3aaec8a 2338 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2339 if (!ieee80211_vif_is_mesh(&sdata->vif))
2340 break;
25d49e4d
TP		 2341 if (mesh_action_is_path_sel(mgmt) &&
2342 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2343 break;
2344 goto queue;
84040805 2345 }
026331c4 2346
2e161f78
JB		 2347 return RX_CONTINUE;
2348
bed7ee6e 2349 invalid:
554891e6 2350 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2351 /* will return in the next handlers */
2352 return RX_CONTINUE;
2353
2354 handled:
2355 if (rx->sta)
2356 rx->sta->rx_packets++;
2357 dev_kfree_skb(rx->skb);
2358 return RX_QUEUED;
2359
2360 queue:
2361 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2362 skb_queue_tail(&sdata->skb_queue, rx->skb);
2363 ieee80211_queue_work(&local->hw, &sdata->work);
2364 if (rx->sta)
2365 rx->sta->rx_packets++;
2366 return RX_QUEUED;
2367}
2368
2369static ieee80211_rx_result debug_noinline
2370ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2371{
554891e6 2372 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2373
2374 /* skip known-bad action frames and return them in the next handler */
554891e6 2375 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2376 return RX_CONTINUE;
d7907448 2377
026331c4
JM		 2378 /*
2379 * Getting here means the kernel doesn't know how to handle
2380 * it, but maybe userspace does ... include returned frames
2381 * so userspace can register for those to know whether ones
2382 * it transmitted were processed or returned.
2383 */
026331c4 2384
2e161f78
JB		 2385 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2386 rx->skb->data, rx->skb->len,
2387 GFP_ATOMIC)) {
2388 if (rx->sta)
2389 rx->sta->rx_packets++;
2390 dev_kfree_skb(rx->skb);
2391 return RX_QUEUED;
2392 }
2393
2394
2395 return RX_CONTINUE;
2396}
2397
2398static ieee80211_rx_result debug_noinline
2399ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2400{
2401 struct ieee80211_local *local = rx->local;
2402 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2403 struct sk_buff *nskb;
2404 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2405 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2406
2407 if (!ieee80211_is_action(mgmt->frame_control))
2408 return RX_CONTINUE;
2409
2410 /*
2411 * For AP mode, hostapd is responsible for handling any action
2412 * frames that we didn't handle, including returning unknown
2413 * ones. For all other modes we will return them to the sender,
2414 * setting the 0x80 bit in the action category, as required by
2415 * 802.11-2007 7.3.1.11.
2416 * Newer versions of hostapd shall also use the management frame
2417 * registration mechanisms, but older ones still use cooked
2418 * monitor interfaces so push all frames there.
2419 */
554891e6 2420 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2421 (sdata->vif.type == NL80211_IFTYPE_AP ||
2422 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2423 return RX_DROP_MONITOR;
026331c4 2424
84040805
JB		 2425 /* do not return rejected action frames */
2426 if (mgmt->u.action.category & 0x80)
2427 return RX_DROP_UNUSABLE;
2428
2429 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2430 GFP_ATOMIC);
2431 if (nskb) {
292b4df6 2432 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2433
292b4df6
JL		 2434 nmgmt->u.action.category |= 0x80;
2435 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2436 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2437
2438 memset(nskb->cb, 0, sizeof(nskb->cb));
2439
2440 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2441 }
39192c0b
JB		 2442 dev_kfree_skb(rx->skb);
2443 return RX_QUEUED;
de1ede7a
JB		 2444}
2445
49461622 2446static ieee80211_rx_result debug_noinline
5cf121c3 2447ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2448{
eb9fb5b8 2449 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2450 ieee80211_rx_result rxs;
77a121c3
JB		 2451 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2452 __le16 stype;
571ecf67 2453
af6b6374
JB		 2454 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2455 if (rxs != RX_CONTINUE)
2456 return rxs;
2457
77a121c3 2458 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2459
77a121c3
JB		 2460 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2461 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2462 sdata->vif.type != NL80211_IFTYPE_STATION)
2463 return RX_DROP_MONITOR;
472dbc45 2464
77a121c3
JB		 2465 switch (stype) {
2466 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2467 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2468 /* process for all: mesh, mlme, ibss */
2469 break;
2470 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2471 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2472 if (is_multicast_ether_addr(mgmt->da) &&
2473 !is_broadcast_ether_addr(mgmt->da))
2474 return RX_DROP_MONITOR;
2475
77a121c3
JB		 2476 /* process only for station */
2477 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2478 return RX_DROP_MONITOR;
2479 break;
2480 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2481 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2482 /* process only for ibss */
2483 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2484 return RX_DROP_MONITOR;
2485 break;
2486 default:
2487 return RX_DROP_MONITOR;
2488 }
f9d540ee 2489
77a121c3 2490 /* queue up frame and kick off work to process it */
c1475ca9 2491 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2492 skb_queue_tail(&sdata->skb_queue, rx->skb);
2493 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2494 if (rx->sta)
2495 rx->sta->rx_packets++;
46900298 2496
77a121c3 2497 return RX_QUEUED;
571ecf67
JB		 2498}
2499
5cf121c3 2500/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2501static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2502 struct ieee80211_rate *rate)
3d30d949
MW		 2503{
2504 struct ieee80211_sub_if_data *sdata;
2505 struct ieee80211_local *local = rx->local;
2506 struct ieee80211_rtap_hdr {
2507 struct ieee80211_radiotap_header hdr;
2508 u8 flags;
5f0b7de5 2509 u8 rate_or_pad;
3d30d949
MW		 2510 __le16 chan_freq;
2511 __le16 chan_flags;
bc10502d 2512 } __packed *rthdr;
3d30d949
MW		 2513 struct sk_buff *skb = rx->skb, *skb2;
2514 struct net_device *prev_dev = NULL;
eb9fb5b8 2515 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2516
554891e6
JB		 2517 /*
2518 * If cooked monitor has been processed already, then
2519 * don't do it again. If not, set the flag.
2520 */
2521 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2522 goto out_free_skb;
554891e6 2523 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2524
152c477a
JB		 2525 /* If there are no cooked monitor interfaces, just free the SKB */
2526 if (!local->cooked_mntrs)
2527 goto out_free_skb;
2528
3d30d949
MW		 2529 if (skb_headroom(skb) < sizeof(*rthdr) &&
2530 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2531 goto out_free_skb;
2532
2533 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2534 memset(rthdr, 0, sizeof(*rthdr));
2535 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2536 rthdr->hdr.it_present =
2537 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2538 (1 << IEEE80211_RADIOTAP_CHANNEL));
2539
5f0b7de5
JB		 2540 if (rate) {
2541 rthdr->rate_or_pad = rate->bitrate / 5;
2542 rthdr->hdr.it_present |=
2543 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2544 }
3d30d949
MW		 2545 rthdr->chan_freq = cpu_to_le16(status->freq);
2546
2547 if (status->band == IEEE80211_BAND_5GHZ)
2548 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2549 IEEE80211_CHAN_5GHZ);
2550 else
2551 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2552 IEEE80211_CHAN_2GHZ);
2553
2554 skb_set_mac_header(skb, 0);
2555 skb->ip_summed = CHECKSUM_UNNECESSARY;
2556 skb->pkt_type = PACKET_OTHERHOST;
2557 skb->protocol = htons(ETH_P_802_2);
2558
2559 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2560 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2561 continue;
2562
05c914fe 2563 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2564 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2565 continue;
2566
2567 if (prev_dev) {
2568 skb2 = skb_clone(skb, GFP_ATOMIC);
2569 if (skb2) {
2570 skb2->dev = prev_dev;
5548a8a1 2571 netif_receive_skb(skb2);
3d30d949
MW		 2572 }
2573 }
2574
2575 prev_dev = sdata->dev;
2576 sdata->dev->stats.rx_packets++;
2577 sdata->dev->stats.rx_bytes += skb->len;
2578 }
2579
2580 if (prev_dev) {
2581 skb->dev = prev_dev;
5548a8a1 2582 netif_receive_skb(skb);
554891e6
JB		 2583 return;
2584 }
3d30d949
MW		 2585
2586 out_free_skb:
2587 dev_kfree_skb(skb);
2588}
2589
aa0c8636
CL		 2590static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2591 ieee80211_rx_result res)
2592{
2593 switch (res) {
2594 case RX_DROP_MONITOR:
2595 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2596 if (rx->sta)
2597 rx->sta->rx_dropped++;
2598 /* fall through */
2599 case RX_CONTINUE: {
2600 struct ieee80211_rate *rate = NULL;
2601 struct ieee80211_supported_band *sband;
2602 struct ieee80211_rx_status *status;
2603
2604 status = IEEE80211_SKB_RXCB((rx->skb));
2605
2606 sband = rx->local->hw.wiphy->bands[status->band];
2607 if (!(status->flag & RX_FLAG_HT))
2608 rate = &sband->bitrates[status->rate_idx];
2609
2610 ieee80211_rx_cooked_monitor(rx, rate);
2611 break;
2612 }
2613 case RX_DROP_UNUSABLE:
2614 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2615 if (rx->sta)
2616 rx->sta->rx_dropped++;
2617 dev_kfree_skb(rx->skb);
2618 break;
2619 case RX_QUEUED:
2620 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2621 break;
2622 }
2623}
571ecf67 2624
24a8fdad 2625static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2626{
58905290 2627 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2628 struct sk_buff *skb;
8944b79f 2629
e32f85f7
LCC		 2630#define CALL_RXH(rxh) \
2631 do { \
2632 res = rxh(rx); \
2633 if (res != RX_CONTINUE) \
2569a826 2634 goto rxh_next; \
e32f85f7 2635 } while (0);
49461622 2636
24a8fdad
CL		 2637 spin_lock(&rx->local->rx_skb_queue.lock);
2638 if (rx->local->running_rx_handler)
2639 goto unlock;
2640
2641 rx->local->running_rx_handler = true;
2642
2643 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2644 spin_unlock(&rx->local->rx_skb_queue.lock);
2645
2569a826
JB		 2646 /*
2647 * all the other fields are valid across frames
2648 * that belong to an aMPDU since they are on the
2649 * same TID from the same station
2650 */
2651 rx->skb = skb;
2652
2653 CALL_RXH(ieee80211_rx_h_decrypt)
2654 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2655 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2656 CALL_RXH(ieee80211_rx_h_sta_process)
2657 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2658 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2659 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2660#ifdef CONFIG_MAC80211_MESH
aa0c8636 2661 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2662 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2663#endif
2154c81c
JC		 2664 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2665 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2666 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2667 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2668 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2669 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2670 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2671 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2672 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2673
aa0c8636
CL		 2674 rxh_next:
2675 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2676 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2677#undef CALL_RXH
aa0c8636 2678 }
24a8fdad
CL		 2679
2680 rx->local->running_rx_handler = false;
2681
2682 unlock:
2683 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2684}
2685
4406c376 2686static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2687{
aa0c8636
CL		 2688 ieee80211_rx_result res = RX_DROP_MONITOR;
2689
aa0c8636
CL		 2690#define CALL_RXH(rxh) \
2691 do { \
2692 res = rxh(rx); \
2693 if (res != RX_CONTINUE) \
2694 goto rxh_next; \
2695 } while (0);
2696
2697 CALL_RXH(ieee80211_rx_h_passive_scan)
2698 CALL_RXH(ieee80211_rx_h_check)
2699
24a8fdad 2700 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2701
24a8fdad 2702 ieee80211_rx_handlers(rx);
aa0c8636 2703 return;
49461622 2704
2569a826 2705 rxh_next:
aa0c8636
CL		 2706 ieee80211_rx_handlers_result(rx, res);
2707
2708#undef CALL_RXH
58905290
JB		 2709}
2710
2bff8ebf 2711/*
dd318575
JB		 2712 * This function makes calls into the RX path, therefore
2713 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2714 */
2715void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2716{
554891e6
JB		 2717 struct ieee80211_rx_data rx = {
2718 .sta = sta,
2719 .sdata = sta->sdata,
2720 .local = sta->local,
9e26297a
JB		 2721 /* This is OK -- must be QoS data frame */
2722 .security_idx = tid,
2723 .seqno_idx = tid,
fcf8bd3b 2724 .flags = 0,
554891e6 2725 };
2c15a0cf
CL		 2726 struct tid_ampdu_rx *tid_agg_rx;
2727
2728 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2729 if (!tid_agg_rx)
2730 return;
2bff8ebf 2731
2c15a0cf 2732 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2733 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2734 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2735
24a8fdad 2736 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2737}
2738
571ecf67
JB		 2739/* main receive path */
2740
20b01f80 2741static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2742 struct ieee80211_hdr *hdr)
2743{
20b01f80 2744 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2745 struct sk_buff *skb = rx->skb;
2746 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2747 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2748 int multicast = is_multicast_ether_addr(hdr->addr1);
2749
51fb61e7 2750 switch (sdata->vif.type) {
05c914fe 2751 case NL80211_IFTYPE_STATION:
9bc383de 2752 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2753 return 0;
77fdaa12 2754 if (!multicast &&
47846c9b 2755 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2756 if (!(sdata->dev->flags & IFF_PROMISC) ||
2757 sdata->u.mgd.use_4addr)
23a24def 2758 return 0;
554891e6 2759 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2760 }
2761 break;
05c914fe 2762 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2763 if (!bssid)
2764 return 0;
a7767f95 2765 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2766 return 1;
87291c02 2767 }
46900298 2768 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2769 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2770 return 0;
554891e6 2771 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2772 } else if (!multicast &&
47846c9b 2773 compare_ether_addr(sdata->vif.addr,
23a24def 2774 hdr->addr1) != 0) {
4150c572 2775 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2776 return 0;
554891e6 2777 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2778 } else if (!rx->sta) {
2779 int rate_idx;
eb9fb5b8 2780 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2781 rate_idx = 0; /* TODO: HT rates */
2782 else
eb9fb5b8 2783 rate_idx = status->rate_idx;
34e89507
JB		 2784 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2785 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2786 }
23a24def 2787 break;
05c914fe 2788 case NL80211_IFTYPE_MESH_POINT:
6032f934 2789 if (!multicast &&
47846c9b 2790 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2791 hdr->addr1) != 0) {
2792 if (!(sdata->dev->flags & IFF_PROMISC))
2793 return 0;
2794
554891e6 2795 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2796 }
2797 break;
05c914fe
JB		 2798 case NL80211_IFTYPE_AP_VLAN:
2799 case NL80211_IFTYPE_AP:
23a24def 2800 if (!bssid) {
47846c9b 2801 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2802 hdr->addr1))
2803 return 0;
2804 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2805 sdata->vif.addr)) {
771bbd09 2806 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2807 !ieee80211_is_beacon(hdr->frame_control) &&
2808 !(ieee80211_is_action(hdr->frame_control) &&
2809 sdata->vif.p2p))
23a24def 2810 return 0;
554891e6 2811 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2812 }
23a24def 2813 break;
05c914fe 2814 case NL80211_IFTYPE_WDS:
a7767f95 2815 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2816 return 0;
2817 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2818 return 0;
2819 break;
2ca27bcf 2820 default:
fb1c1cd6
JB		 2821 /* should never get here */
2822 WARN_ON(1);
2823 break;
23a24def
JB		 2824 }
2825
2826 return 1;
2827}
2828
4406c376
JB		 2829/*
2830 * This function returns whether or not the SKB
2831 * was destined for RX processing or not, which,
2832 * if consume is true, is equivalent to whether
2833 * or not the skb was consumed.
2834 */
2835static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2836 struct sk_buff *skb, bool consume)
2837{
2838 struct ieee80211_local *local = rx->local;
2839 struct ieee80211_sub_if_data *sdata = rx->sdata;
2840 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2841 struct ieee80211_hdr *hdr = (void *)skb->data;
2842 int prepares;
2843
2844 rx->skb = skb;
554891e6 2845 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2846 prepares = prepare_for_handlers(rx, hdr);
2847
2848 if (!prepares)
2849 return false;
2850
4406c376
JB		 2851 if (!consume) {
2852 skb = skb_copy(skb, GFP_ATOMIC);
2853 if (!skb) {
2854 if (net_ratelimit())
2855 wiphy_debug(local->hw.wiphy,
b305dae4 2856 "failed to copy skb for %s\n",
4406c376
JB		 2857 sdata->name);
2858 return true;
2859 }
2860
2861 rx->skb = skb;
2862 }
2863
2864 ieee80211_invoke_rx_handlers(rx);
2865 return true;
2866}
2867
571ecf67 2868/*
6368e4b1
RR		 2869 * This is the actual Rx frames handler. as it blongs to Rx path it must
2870 * be called with rcu_read_lock protection.
571ecf67 2871 */
71ebb4aa 2872static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2873 struct sk_buff *skb)
571ecf67 2874{
554891e6 2875 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2876 struct ieee80211_local *local = hw_to_local(hw);
2877 struct ieee80211_sub_if_data *sdata;
571ecf67 2878 struct ieee80211_hdr *hdr;
e3cf8b3f 2879 __le16 fc;
5cf121c3 2880 struct ieee80211_rx_data rx;
4406c376 2881 struct ieee80211_sub_if_data *prev;
56af3268 2882 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2883 int err = 0;
571ecf67 2884
e3cf8b3f 2885 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2886 memset(&rx, 0, sizeof(rx));
2887 rx.skb = skb;
2888 rx.local = local;
72abd81b 2889
e3cf8b3f 2890 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2891 local->dot11ReceivedFragmentCount++;
571ecf67 2892
142b9f50 2893 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2894 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2895 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2896
e3cf8b3f
ZY		 2897 if (ieee80211_is_mgmt(fc))
2898 err = skb_linearize(skb);
2899 else
2900 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2901
2902 if (err) {
2903 dev_kfree_skb(skb);
2904 return;
2905 }
2906
2907 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2908 ieee80211_parse_qos(&rx);
d1c3a37c 2909 ieee80211_verify_alignment(&rx);
38f3714d 2910
e3cf8b3f 2911 if (ieee80211_is_data(fc)) {
56af3268 2912 prev_sta = NULL;
4406c376 2913
2a33bee2 2914 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2915 if (!prev_sta) {
2916 prev_sta = sta;
2917 continue;
2918 }
2919
2920 rx.sta = prev_sta;
2921 rx.sdata = prev_sta->sdata;
4406c376 2922 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2923
56af3268 2924 prev_sta = sta;
4406c376 2925 }
56af3268
BG		 2926
2927 if (prev_sta) {
2928 rx.sta = prev_sta;
2929 rx.sdata = prev_sta->sdata;
2930
4406c376 2931 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2932 return;
8e26d5ad 2933 goto out;
56af3268 2934 }
4406c376
JB		 2935 }
2936
4b0dd98e 2937 prev = NULL;
b2e7771e 2938
4b0dd98e
JB		 2939 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2940 if (!ieee80211_sdata_running(sdata))
2941 continue;
340e11f3 2942
4b0dd98e
JB		 2943 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2944 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2945 continue;
340e11f3 2946
4b0dd98e
JB		 2947 /*
2948 * frame is destined for this interface, but if it's
2949 * not also for the previous one we handle that after
2950 * the loop to avoid copying the SKB once too much
2951 */
4bb29f8c 2952
4b0dd98e 2953 if (!prev) {
abe60632 2954 prev = sdata;
4b0dd98e 2955 continue;
340e11f3 2956 }
4bb29f8c 2957
2a33bee2 2958 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2959 rx.sdata = prev;
2960 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2961
4b0dd98e
JB		 2962 prev = sdata;
2963 }
2964
2965 if (prev) {
2a33bee2 2966 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2967 rx.sdata = prev;
4406c376 2968
4b0dd98e
JB		 2969 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2970 return;
571ecf67 2971 }
4406c376 2972
8e26d5ad 2973 out:
4406c376 2974 dev_kfree_skb(skb);
571ecf67 2975}
6368e4b1
RR		 2976
2977/*
2978 * This is the receive path handler. It is called by a low level driver when an
2979 * 802.11 MPDU is received from the hardware.
2980 */
103bf9f7 2981void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2982{
2983 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2984 struct ieee80211_rate *rate = NULL;
2985 struct ieee80211_supported_band *sband;
f1d58c25 2986 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2987
d20ef63d
JB		 2988 WARN_ON_ONCE(softirq_count() == 0);
2989
77a980dc
JB		 2990 if (WARN_ON(status->band < 0 ||
2991 status->band >= IEEE80211_NUM_BANDS))
2992 goto drop;
8318d78a
JB		 2993
2994 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2995 if (WARN_ON(!sband))
2996 goto drop;
8318d78a 2997
89c3a8ac
JB		 2998 /*
2999 * If we're suspending, it is possible although not too likely
3000 * that we'd be receiving frames after having already partially
3001 * quiesced the stack. We can't process such frames then since
3002 * that might, for example, cause stations to be added or other
3003 * driver callbacks be invoked.
3004 */
77a980dc
JB		 3005 if (unlikely(local->quiescing || local->suspended))
3006 goto drop;
89c3a8ac 3007
ea77f12f
JB		 3008 /*
3009 * The same happens when we're not even started,
3010 * but that's worth a warning.
3011 */
77a980dc
JB		 3012 if (WARN_ON(!local->started))
3013 goto drop;
ea77f12f 3014
fc885189 3015 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3016 /*
fc885189
JB		 3017 * Validate the rate, unless a PLCP error means that
3018 * we probably can't have a valid rate here anyway.
e5d6eb83 3019 */
fc885189
JB		 3020
3021 if (status->flag & RX_FLAG_HT) {
3022 /*
3023 * rate_idx is MCS index, which can be [0-76]
3024 * as documented on:
3025 *
3026 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3027 *
3028 * Anything else would be some sort of driver or
3029 * hardware error. The driver should catch hardware
3030 * errors.
3031 */
3032 if (WARN((status->rate_idx < 0 ||
3033 status->rate_idx > 76),
3034 "Rate marked as an HT rate but passed "
3035 "status->rate_idx is not "
3036 "an MCS index [0-76]: %d (0x%02x)\n",
3037 status->rate_idx,
3038 status->rate_idx))
3039 goto drop;
3040 } else {
3041 if (WARN_ON(status->rate_idx < 0 ||
3042 status->rate_idx >= sband->n_bitrates))
3043 goto drop;
3044 rate = &sband->bitrates[status->rate_idx];
3045 }
0fb8ca45 3046 }
6368e4b1 3047
554891e6
JB		 3048 status->rx_flags = 0;
3049
6368e4b1
RR		 3050 /*
3051 * key references and virtual interfaces are protected using RCU
3052 * and this requires that we are in a read-side RCU section during
3053 * receive processing
3054 */
3055 rcu_read_lock();
3056
3057 /*
3058 * Frames with failed FCS/PLCP checksum are not returned,
3059 * all other frames are returned without radiotap header
3060 * if it was previously present.
3061 * Also, frames with less than 16 bytes are dropped.
3062 */
f1d58c25 3063 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3064 if (!skb) {
3065 rcu_read_unlock();
3066 return;
3067 }
3068
e1e54068
JB		 3069 ieee80211_tpt_led_trig_rx(local,
3070 ((struct ieee80211_hdr *)skb->data)->frame_control,
3071 skb->len);
071d9ac2 3072 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3073
3074 rcu_read_unlock();
77a980dc
JB		 3075
3076 return;
3077 drop:
3078 kfree_skb(skb);
6368e4b1 3079}
103bf9f7 3080EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3081
3082/* This is a version of the rx handler that can be called from hard irq
3083 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3084void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3085{
3086 struct ieee80211_local *local = hw_to_local(hw);
3087
3088 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3089
571ecf67
JB		 3090 skb->pkt_type = IEEE80211_RX_MSG;
3091 skb_queue_tail(&local->skb_queue, skb);
3092 tasklet_schedule(&local->tasklet);
3093}
3094EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)