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rt2x00:Add RT539b chipset support
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
0869aea0 65 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 66 return 1;
87228f57
HH		 67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 70 return 1;
71 return 0;
72}
73
601ae7f2
BR		 74static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
6ebacbb7 83 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 84 len += 8;
7fee5372 85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 86 len += 1;
601ae7f2
BR		 87
88 if (len & 1) /* padding for RX_FLAGS if necessary */
89 len++;
90
6d744bac
JB		 91 if (status->flag & RX_FLAG_HT) /* HT info */
92 len += 3;
93
601ae7f2
BR		 94 return len;
95}
96
d1c3a37c 97/*
601ae7f2
BR		 98 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
601ae7f2 105 struct ieee80211_rate *rate,
973ef21a 106 int rtap_len, bool has_fcs)
601ae7f2 107{
f1d58c25 108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
6a86b9c7 111 u16 rx_flags = 0;
601ae7f2
BR		 112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 130 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 137 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 138 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 146 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 147 /*
f8d1ccf1 148 * Without rate information don't add it. If we have,
38f37be2 149 * MCS information is a separate field in radiotap,
73b48099
JB		 150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 152 */
153 *pos = 0;
8d6f658e 154 } else {
ebe6c7ba 155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 156 *pos = rate->bitrate / 5;
8d6f658e 157 }
601ae7f2
BR		 158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 161 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
5f0b7de5
JB		 166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 pos);
f8d1ccf1 169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 pos);
f8d1ccf1 172 else if (rate)
6a86b9c7
JB		 173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 pos);
f8d1ccf1
JB		 175 else
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 182 *pos = status->signal;
183 rthdr->it_present |=
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 pos++;
186 }
187
601ae7f2
BR		 188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
189
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
192 pos++;
193
601ae7f2
BR		 194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 198 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 199 pos++;
aae89831 200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
601ae7f2 203 pos += 2;
6d744bac
JB		 204
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
210 *pos = 0;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
215 pos++;
216 *pos++ = status->rate_idx;
217 }
601ae7f2
BR		 218}
219
b2e7771e
JB		 220/*
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
224 */
225static struct sk_buff *
226ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 227 struct ieee80211_rate *rate)
b2e7771e 228{
f1d58c25 229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 230 struct ieee80211_sub_if_data *sdata;
293702a3 231 int needed_headroom;
b2e7771e
JB		 232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
b2e7771e
JB		 235
236 /*
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
240 *
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
243 */
0869aea0
JB		 244
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 247
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
250
e3cf8b3f
ZY		 251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
b2e7771e 257 if (!local->monitors) {
0869aea0 258 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 259 dev_kfree_skb(origskb);
260 return NULL;
261 }
262
0869aea0 263 return remove_monitor_info(local, origskb);
b2e7771e
JB		 264 }
265
0869aea0 266 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 267 /* only need to expand headroom if necessary */
268 skb = origskb;
269 origskb = NULL;
270
271 /*
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
277 */
278 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 280 dev_kfree_skb(skb);
281 return NULL;
282 }
283 } else {
284 /*
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
287 */
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
289
0869aea0 290 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 291
292 if (!skb)
293 return origskb;
294 }
295
0869aea0 296 /* prepend radiotap information */
973ef21a
FF		 297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
298 true);
b2e7771e 299
ce3edf6d 300 skb_reset_mac_header(skb);
b2e7771e
JB		 301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
304
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 307 continue;
308
3d30d949
MW		 309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
310 continue;
311
9607e6b6 312 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 313 continue;
314
b2e7771e
JB		 315 if (prev_dev) {
316 skb2 = skb_clone(skb, GFP_ATOMIC);
317 if (skb2) {
318 skb2->dev = prev_dev;
5548a8a1 319 netif_receive_skb(skb2);
b2e7771e
JB		 320 }
321 }
322
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
326 }
327
328 if (prev_dev) {
329 skb->dev = prev_dev;
5548a8a1 330 netif_receive_skb(skb);
b2e7771e
JB		 331 } else
332 dev_kfree_skb(skb);
333
334 return origskb;
335}
336
337
5cf121c3 338static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 339{
238f74a2 340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 342 int tid, seqno_idx, security_idx;
6e0d114d
JB		 343
344 /* does the frame have a qos control field? */
238f74a2
HH		 345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 347 /* frame has qos control */
238f74a2 348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 350 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 351
352 seqno_idx = tid;
353 security_idx = tid;
6e0d114d 354 } else {
1411f9b5
JB		 355 /*
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 *
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
363 *
364 * We also use that counter for non-QoS STAs.
365 */
9e26297a
JB		 366 seqno_idx = NUM_RX_DATA_QUEUES;
367 security_idx = 0;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
370 tid = 0;
6e0d114d 371 }
52865dfd 372
9e26297a
JB		 373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
6e0d114d
JB		 375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 378}
6e0d114d 379
d1c3a37c
JB		 380/**
381 * DOC: Packet alignment
382 *
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
384 * to the stack.
385 *
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
d1c3a37c
JB		 394 *
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
400 *
25985edc 401 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
404 */
405static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 406{
59d9cb07
KV		 407#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 410#endif
6e0d114d
JB		 411}
412
6368e4b1 413
571ecf67
JB		 414/* rx handlers */
415
49461622 416static ieee80211_rx_result debug_noinline
5cf121c3 417ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 418{
419 struct ieee80211_local *local = rx->local;
554891e6 420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 421 struct sk_buff *skb = rx->skb;
422
79f460ca
LC		 423 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
424 !local->sched_scanning))
4080c7cd
JB		 425 return RX_CONTINUE;
426
b23b025f 427 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca 428 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
8a690674 429 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
79f460ca 430 local->sched_scanning)
f1d58c25 431 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 432
4080c7cd
JB		 433 /* scanning finished during invoking of handlers */
434 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
435 return RX_DROP_UNUSABLE;
571ecf67
JB		 436}
437
3cfcf6ac
JM		 438
439static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
440{
441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
442
443 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
444 return 0;
445
446 return ieee80211_is_robust_mgmt_frame(hdr);
447}
448
449
450static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
451{
452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
453
454 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
455 return 0;
456
457 return ieee80211_is_robust_mgmt_frame(hdr);
458}
459
460
461/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
462static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
463{
464 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
465 struct ieee80211_mmie *mmie;
466
467 if (skb->len < 24 + sizeof(*mmie) ||
468 !is_multicast_ether_addr(hdr->da))
469 return -1;
470
471 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
472 return -1; /* not a robust management frame */
473
474 mmie = (struct ieee80211_mmie *)
475 (skb->data + skb->len - sizeof(*mmie));
476 if (mmie->element_id != WLAN_EID_MMIE ||
477 mmie->length != sizeof(*mmie) - 2)
478 return -1;
479
480 return le16_to_cpu(mmie->key_id);
481}
482
483
33b64eb2 484static ieee80211_rx_result
5cf121c3 485ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 486{
a7767f95 487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 488 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 489
a7767f95 490 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 491 if (is_multicast_ether_addr(hdr->addr1)) {
492 if (ieee80211_has_tods(hdr->frame_control) ||
493 !ieee80211_has_fromds(hdr->frame_control))
494 return RX_DROP_MONITOR;
888d04df 495 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
3c5772a5
JC		 496 return RX_DROP_MONITOR;
497 } else {
498 if (!ieee80211_has_a4(hdr->frame_control))
499 return RX_DROP_MONITOR;
888d04df 500 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
3c5772a5
JC		 501 return RX_DROP_MONITOR;
502 }
33b64eb2
LCC		 503 }
504
505 /* If there is not an established peer link and this is not a peer link
506 * establisment frame, beacon or probe, drop the frame.
507 */
508
57cf8043 509 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 510 struct ieee80211_mgmt *mgmt;
d6d1a5a7 511
a7767f95 512 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 513 return RX_DROP_MONITOR;
514
a7767f95 515 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 516 u8 category;
33b64eb2 517 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 518 category = mgmt->u.action.category;
519 if (category != WLAN_CATEGORY_MESH_ACTION &&
520 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 521 return RX_DROP_MONITOR;
33b64eb2 522 return RX_CONTINUE;
33b64eb2
LCC		 523 }
524
a7767f95
HH		 525 if (ieee80211_is_probe_req(hdr->frame_control) ||
526 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 527 ieee80211_is_beacon(hdr->frame_control) ||
528 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 529 return RX_CONTINUE;
530
531 return RX_DROP_MONITOR;
532
533 }
534
902acc78
JB		 535 return RX_CONTINUE;
536}
33b64eb2 537
1edfb1af
JB		 538#define SEQ_MODULO 0x1000
539#define SEQ_MASK 0xfff
540
541static inline int seq_less(u16 sq1, u16 sq2)
542{
543 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
544}
545
546static inline u16 seq_inc(u16 sq)
547{
548 return (sq + 1) & SEQ_MASK;
549}
550
551static inline u16 seq_sub(u16 sq1, u16 sq2)
552{
553 return (sq1 - sq2) & SEQ_MASK;
554}
555
556
557static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
558 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 559 int index)
1edfb1af 560{
24a8fdad 561 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 562 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 563 struct ieee80211_rx_status *status;
1edfb1af 564
dd318575
JB		 565 lockdep_assert_held(&tid_agg_rx->reorder_lock);
566
1edfb1af
JB		 567 if (!skb)
568 goto no_frame;
569
071d9ac2 570 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 571 tid_agg_rx->stored_mpdu_num--;
572 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 573 status = IEEE80211_SKB_RXCB(skb);
574 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 575 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 576
577no_frame:
578 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
579}
580
581static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
582 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 583 u16 head_seq_num)
1edfb1af
JB		 584{
585 int index;
586
dd318575
JB		 587 lockdep_assert_held(&tid_agg_rx->reorder_lock);
588
1edfb1af
JB		 589 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
590 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
591 tid_agg_rx->buf_size;
24a8fdad 592 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 593 }
594}
595
596/*
597 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
598 * the skb was added to the buffer longer than this time ago, the earlier
599 * frames that have not yet been received are assumed to be lost and the skb
600 * can be released for processing. This may also release other skb's from the
601 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 602 *
603 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 604 */
605#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
606
aa0c8636 607static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 608 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 609{
2bff8ebf 610 int index, j;
aa0c8636 611
dd318575
JB		 612 lockdep_assert_held(&tid_agg_rx->reorder_lock);
613
aa0c8636
CL		 614 /* release the buffer until next missing frame */
615 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
616 tid_agg_rx->buf_size;
617 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 618 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 619 /*
620 * No buffers ready to be released, but check whether any
621 * frames in the reorder buffer have timed out.
622 */
aa0c8636
CL		 623 int skipped = 1;
624 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
625 j = (j + 1) % tid_agg_rx->buf_size) {
626 if (!tid_agg_rx->reorder_buf[j]) {
627 skipped++;
628 continue;
629 }
499fe9a4
DH		 630 if (skipped &&
631 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 632 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 633 goto set_release_timer;
aa0c8636
CL		 634
635#ifdef CONFIG_MAC80211_HT_DEBUG
636 if (net_ratelimit())
0fb9a9ec
JP		 637 wiphy_debug(hw->wiphy,
638 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 639#endif
24a8fdad 640 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 641
642 /*
643 * Increment the head seq# also for the skipped slots.
644 */
645 tid_agg_rx->head_seq_num =
646 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
647 skipped = 0;
648 }
649 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 650 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 651 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
652 tid_agg_rx->buf_size;
653 }
2bff8ebf
CL		 654
655 if (tid_agg_rx->stored_mpdu_num) {
656 j = index = seq_sub(tid_agg_rx->head_seq_num,
657 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
658
659 for (; j != (index - 1) % tid_agg_rx->buf_size;
660 j = (j + 1) % tid_agg_rx->buf_size) {
661 if (tid_agg_rx->reorder_buf[j])
662 break;
663 }
664
665 set_release_timer:
666
667 mod_timer(&tid_agg_rx->reorder_timer,
334df731 668 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 669 HT_RX_REORDER_BUF_TIMEOUT);
670 } else {
671 del_timer(&tid_agg_rx->reorder_timer);
672 }
aa0c8636
CL		 673}
674
1edfb1af
JB		 675/*
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
679 */
680static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
681 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 682 struct sk_buff *skb)
1edfb1af
JB		 683{
684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
685 u16 sc = le16_to_cpu(hdr->seq_ctrl);
686 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
687 u16 head_seq_num, buf_size;
688 int index;
2bff8ebf 689 bool ret = true;
1edfb1af 690
dd318575
JB		 691 spin_lock(&tid_agg_rx->reorder_lock);
692
1edfb1af
JB		 693 buf_size = tid_agg_rx->buf_size;
694 head_seq_num = tid_agg_rx->head_seq_num;
695
696 /* frame with out of date sequence number */
697 if (seq_less(mpdu_seq_num, head_seq_num)) {
698 dev_kfree_skb(skb);
2bff8ebf 699 goto out;
1edfb1af
JB		 700 }
701
702 /*
703 * If frame the sequence number exceeds our buffering window
704 * size release some previous frames to make room for this one.
705 */
706 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
707 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
708 /* release stored frames up to new head to stack */
24a8fdad 709 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 710 }
711
712 /* Now the new frame is always in the range of the reordering buffer */
713
714 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
715
716 /* check if we already stored this frame */
717 if (tid_agg_rx->reorder_buf[index]) {
718 dev_kfree_skb(skb);
2bff8ebf 719 goto out;
1edfb1af
JB		 720 }
721
722 /*
723 * If the current MPDU is in the right order and nothing else
724 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 725 * If it is first but there's something stored, we may be able
726 * to release frames after this one.
1edfb1af
JB		 727 */
728 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
729 tid_agg_rx->stored_mpdu_num == 0) {
730 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 731 ret = false;
732 goto out;
1edfb1af
JB		 733 }
734
735 /* put the frame in the reordering buffer */
736 tid_agg_rx->reorder_buf[index] = skb;
737 tid_agg_rx->reorder_time[index] = jiffies;
738 tid_agg_rx->stored_mpdu_num++;
24a8fdad 739 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 740
2bff8ebf
CL		 741 out:
742 spin_unlock(&tid_agg_rx->reorder_lock);
743 return ret;
1edfb1af
JB		 744}
745
746/*
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
749 */
24a8fdad 750static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 751{
2569a826
JB		 752 struct sk_buff *skb = rx->skb;
753 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 754 struct ieee80211_hw *hw = &local->hw;
755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 756 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 757 struct sta_info *sta = rx->sta;
1edfb1af
JB		 758 struct tid_ampdu_rx *tid_agg_rx;
759 u16 sc;
6cc00d54 760 u8 tid, ack_policy;
1edfb1af
JB		 761
762 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 763 goto dont_reorder;
1edfb1af
JB		 764
765 /*
766 * filter the QoS data rx stream according to
767 * STA/TID and check if this STA/TID is on aggregation
768 */
769
1edfb1af 770 if (!sta)
2569a826 771 goto dont_reorder;
1edfb1af 772
6cc00d54
TP		 773 ack_policy = *ieee80211_get_qos_ctl(hdr) &
774 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 775 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
776
a87f736d
JB		 777 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
778 if (!tid_agg_rx)
779 goto dont_reorder;
1edfb1af
JB		 780
781 /* qos null data frames are excluded */
782 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 783 goto dont_reorder;
1edfb1af 784
6cc00d54
TP		 785 /* not part of a BA session */
786 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
787 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
788 goto dont_reorder;
789
660c6a44
TP		 790 /* not actually part of this BA session */
791 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
792 goto dont_reorder;
793
1edfb1af
JB		 794 /* new, potentially un-ordered, ampdu frame - process it */
795
796 /* reset session timer */
797 if (tid_agg_rx->timeout)
12d3952f 798 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 799
800 /* if this mpdu is fragmented - terminate rx aggregation session */
801 sc = le16_to_cpu(hdr->seq_ctrl);
802 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 803 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 804 skb_queue_tail(&rx->sdata->skb_queue, skb);
805 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 806 return;
1edfb1af
JB		 807 }
808
a87f736d
JB		 809 /*
810 * No locking needed -- we will only ever process one
811 * RX packet at a time, and thus own tid_agg_rx. All
812 * other code manipulating it needs to (and does) make
813 * sure that we cannot get to it any more before doing
814 * anything with it.
815 */
24a8fdad 816 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 817 return;
818
819 dont_reorder:
24a8fdad 820 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 821}
33b64eb2 822
49461622 823static ieee80211_rx_result debug_noinline
5cf121c3 824ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 825{
a7767f95 826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 828
829 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
830 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 831 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 832 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 833 hdr->seq_ctrl)) {
554891e6 834 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 835 rx->local->dot11FrameDuplicateCount++;
836 rx->sta->num_duplicates++;
837 }
b1f93314 838 return RX_DROP_UNUSABLE;
571ecf67 839 } else
9e26297a 840 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 841 }
842
571ecf67
JB		 843 if (unlikely(rx->skb->len < 16)) {
844 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 845 return RX_DROP_MONITOR;
571ecf67
JB		 846 }
847
571ecf67
JB		 848 /* Drop disallowed frame classes based on STA auth/assoc state;
849 * IEEE 802.11, Chap 5.5.
850 *
ccd7b362
JB		 851 * mac80211 filters only based on association state, i.e. it drops
852 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 853 * deauth/disassoc frames when needed. In addition, hostapd is
854 * responsible for filtering on both auth and assoc states.
855 */
33b64eb2 856
902acc78 857 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 858 return ieee80211_rx_mesh_check(rx);
33b64eb2 859
a7767f95
HH		 860 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
861 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 862 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 863 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 864 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 865 /*
866 * accept port control frames from the AP even when it's not
867 * yet marked ASSOC to prevent a race where we don't set the
868 * assoc bit quickly enough before it sends the first frame
869 */
870 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 871 ieee80211_is_data_present(hdr->frame_control)) {
872 u16 ethertype;
873 u8 *payload;
874
875 payload = rx->skb->data +
876 ieee80211_hdrlen(hdr->frame_control);
877 ethertype = (payload[6] << 8) | payload[7];
878 if (cpu_to_be16(ethertype) ==
879 rx->sdata->control_port_protocol)
880 return RX_CONTINUE;
881 }
21fc7560
JB		 882
883 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
884 cfg80211_rx_spurious_frame(rx->sdata->dev,
885 hdr->addr2,
886 GFP_ATOMIC))
887 return RX_DROP_UNUSABLE;
888
e4c26add 889 return RX_DROP_MONITOR;
2a33bee2 890 }
571ecf67 891
9ae54c84 892 return RX_CONTINUE;
570bd537
JB		 893}
894
895
49461622 896static ieee80211_rx_result debug_noinline
5cf121c3 897ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 898{
eb9fb5b8
JB		 899 struct sk_buff *skb = rx->skb;
900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 902 int keyidx;
903 int hdrlen;
e4c26add 904 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 905 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 906 int mmie_keyidx = -1;
761ab470 907 __le16 fc;
570bd537 908
3017b80b
JB		 909 /*
910 * Key selection 101
911 *
3cfcf6ac 912 * There are four types of keys:
3017b80b 913 * - GTK (group keys)
3cfcf6ac 914 * - IGTK (group keys for management frames)
3017b80b
JB		 915 * - PTK (pairwise keys)
916 * - STK (station-to-station pairwise keys)
917 *
918 * When selecting a key, we have to distinguish between multicast
919 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 920 * use PTKs and STKs while the former always use GTKs and IGTKs.
921 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
922 * unicast frames can also use key indices like GTKs. Hence, if we
923 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 924 *
8dc06a1c
JB		 925 * Note that in a regular BSS, multicast frames are sent by the
926 * AP only, associated stations unicast the frame to the AP first
927 * which then multicasts it on their behalf.
928 *
3017b80b
JB		 929 * There is also a slight problem in IBSS mode: GTKs are negotiated
930 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 931 * The spec seems to expect that one negotiates the same key with
932 * every station but there's no such requirement; VLANs could be
933 * possible.
3017b80b
JB		 934 */
935
3017b80b 936 /*
1990af8d 937 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 938 * addressed to us nor a multicast frame.
939 */
554891e6 940 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 941 return RX_CONTINUE;
3017b80b 942
2569a826
JB		 943 /* start without a key */
944 rx->key = NULL;
945
d4e46a3d 946 if (rx->sta)
e31b8213 947 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 948
761ab470
JB		 949 fc = hdr->frame_control;
950
951 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 952 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
953
e31b8213
JB		 954 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
955 rx->key = sta_ptk;
dc1580dd
JB		 956 if ((status->flag & RX_FLAG_DECRYPTED) &&
957 (status->flag & RX_FLAG_IV_STRIPPED))
958 return RX_CONTINUE;
0c7c10c7 959 /* Skip decryption if the frame is not protected. */
761ab470 960 if (!ieee80211_has_protected(fc))
0c7c10c7 961 return RX_CONTINUE;
3cfcf6ac
JM		 962 } else if (mmie_keyidx >= 0) {
963 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 964 if ((status->flag & RX_FLAG_DECRYPTED) &&
965 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 966 return RX_CONTINUE;
967
968 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
969 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
970 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 971 if (rx->sta)
972 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
973 if (!rx->key)
974 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 975 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 976 /*
977 * The frame was not protected, so skip decryption. However, we
978 * need to set rx->key if there is a key that could have been
979 * used so that the frame may be dropped if encryption would
980 * have been expected.
981 */
982 struct ieee80211_key *key = NULL;
897bed8b
JB		 983 struct ieee80211_sub_if_data *sdata = rx->sdata;
984 int i;
985
761ab470 986 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 987 is_multicast_ether_addr(hdr->addr1) &&
988 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
989 rx->key = key;
897bed8b
JB		 990 else {
991 if (rx->sta) {
992 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
993 key = rcu_dereference(rx->sta->gtk[i]);
994 if (key)
995 break;
996 }
997 }
998 if (!key) {
999 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1000 key = rcu_dereference(sdata->keys[i]);
1001 if (key)
1002 break;
1003 }
1004 }
1005 if (key)
1006 rx->key = key;
1007 }
0c7c10c7 1008 return RX_CONTINUE;
571ecf67 1009 } else {
39184b15 1010 u8 keyid;
3017b80b
JB		 1011 /*
1012 * The device doesn't give us the IV so we won't be
1013 * able to look up the key. That's ok though, we
1014 * don't need to decrypt the frame, we just won't
1015 * be able to keep statistics accurate.
1016 * Except for key threshold notifications, should
1017 * we somehow allow the driver to tell us which key
1018 * the hardware used if this flag is set?
1019 */
eb9fb5b8
JB		 1020 if ((status->flag & RX_FLAG_DECRYPTED) &&
1021 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1022 return RX_CONTINUE;
3017b80b 1023
761ab470 1024 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1025
1026 if (rx->skb->len < 8 + hdrlen)
e4c26add 1027 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1028
1029 /*
1030 * no need to call ieee80211_wep_get_keyidx,
1031 * it verifies a bunch of things we've done already
1032 */
39184b15
ZY		 1033 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1034 keyidx = keyid >> 6;
3017b80b 1035
e31b8213
JB		 1036 /* check per-station GTK first, if multicast packet */
1037 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1038 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1039
e31b8213
JB		 1040 /* if not found, try default key */
1041 if (!rx->key) {
1042 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1043
1044 /*
1045 * RSNA-protected unicast frames should always be
1046 * sent with pairwise or station-to-station keys,
1047 * but for WEP we allow using a key index as well.
1048 */
1049 if (rx->key &&
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1051 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1052 !is_multicast_ether_addr(hdr->addr1))
1053 rx->key = NULL;
1054 }
571ecf67
JB		 1055 }
1056
3017b80b 1057 if (rx->key) {
95acac61
JB		 1058 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1059 return RX_DROP_MONITOR;
1060
571ecf67 1061 rx->key->tx_rx_count++;
011bfcc4 1062 /* TODO: add threshold stuff again */
1990af8d 1063 } else {
e4c26add 1064 return RX_DROP_MONITOR;
70f08765
JB		 1065 }
1066
97359d12
JB		 1067 switch (rx->key->conf.cipher) {
1068 case WLAN_CIPHER_SUITE_WEP40:
1069 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1070 result = ieee80211_crypto_wep_decrypt(rx);
1071 break;
97359d12 1072 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1073 result = ieee80211_crypto_tkip_decrypt(rx);
1074 break;
97359d12 1075 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1076 result = ieee80211_crypto_ccmp_decrypt(rx);
1077 break;
97359d12 1078 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1079 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1080 break;
3ffc2a90
JB		 1081 default:
1082 /*
1083 * We can reach here only with HW-only algorithms
1084 * but why didn't it decrypt the frame?!
1085 */
1086 return RX_DROP_UNUSABLE;
70f08765
JB		 1087 }
1088
a8286911
JB		 1089 /* the hdr variable is invalid after the decrypt handlers */
1090
e2f036da 1091 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1092 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1093
1094 return result;
70f08765
JB		 1095}
1096
572e0012
KV		 1097static ieee80211_rx_result debug_noinline
1098ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1099{
1100 struct ieee80211_local *local;
1101 struct ieee80211_hdr *hdr;
1102 struct sk_buff *skb;
1103
1104 local = rx->local;
1105 skb = rx->skb;
1106 hdr = (struct ieee80211_hdr *) skb->data;
1107
1108 if (!local->pspolling)
1109 return RX_CONTINUE;
1110
1111 if (!ieee80211_has_fromds(hdr->frame_control))
1112 /* this is not from AP */
1113 return RX_CONTINUE;
1114
1115 if (!ieee80211_is_data(hdr->frame_control))
1116 return RX_CONTINUE;
1117
1118 if (!ieee80211_has_moredata(hdr->frame_control)) {
1119 /* AP has no more frames buffered for us */
1120 local->pspolling = false;
1121 return RX_CONTINUE;
1122 }
1123
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local, rx->sdata);
1126
1127 return RX_CONTINUE;
1128}
1129
133b8226 1130static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1131{
133b8226 1132 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1133 struct ieee80211_local *local = sdata->local;
0795af57 1134
3e122be0 1135 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1136 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1137 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1139#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1140 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1141 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1142#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143}
1144
ff9458d3 1145static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1146{
571ecf67 1147#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1148 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
608383bf 1149 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1150#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1151
c2c98fde 1152 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1153#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1154 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
608383bf 1155 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1156#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1157 return;
1158 }
1159
1160 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1161}
1162
d057e5a3
AN		 1163int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1164{
1165 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1166 bool in_ps;
1167
1168 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1169
1170 /* Don't let the same PS state be set twice */
c2c98fde 1171 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1172 if ((start && in_ps) || (!start && !in_ps))
1173 return -EINVAL;
1174
1175 if (start)
1176 ap_sta_ps_start(sta_inf);
1177 else
1178 ap_sta_ps_end(sta_inf);
1179
1180 return 0;
1181}
1182EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1183
47086fc5
JB		 1184static ieee80211_rx_result debug_noinline
1185ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1186{
1187 struct ieee80211_sub_if_data *sdata = rx->sdata;
1188 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1190 int tid, ac;
1191
1192 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1193 return RX_CONTINUE;
1194
1195 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1197 return RX_CONTINUE;
1198
1199 /*
1200 * The device handles station powersave, so don't do anything about
1201 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1202 * it to mac80211 since they're handled.)
1203 */
1204 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1205 return RX_CONTINUE;
1206
1207 /*
1208 * Don't do anything if the station isn't already asleep. In
1209 * the uAPSD case, the station will probably be marked asleep,
1210 * in the PS-Poll case the station must be confused ...
1211 */
c2c98fde 1212 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1213 return RX_CONTINUE;
1214
1215 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1216 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1217 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1218 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1219 else
c2c98fde 1220 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1221 }
47086fc5
JB		 1222
1223 /* Free PS Poll skb here instead of returning RX_DROP that would
1224 * count as an dropped frame. */
1225 dev_kfree_skb(rx->skb);
1226
1227 return RX_QUEUED;
1228 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1230 ieee80211_has_pm(hdr->frame_control) &&
1231 (ieee80211_is_data_qos(hdr->frame_control) ||
1232 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1233 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1234 ac = ieee802_1d_to_ac[tid & 7];
1235
1236 /*
1237 * If this AC is not trigger-enabled do nothing.
1238 *
1239 * NB: This could/should check a separate bitmap of trigger-
1240 * enabled queues, but for now we only implement uAPSD w/o
1241 * TSPEC changes to the ACs, so they're always the same.
1242 */
1243 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1244 return RX_CONTINUE;
1245
1246 /* if we are in a service period, do nothing */
c2c98fde 1247 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1248 return RX_CONTINUE;
1249
c2c98fde 1250 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1251 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1252 else
c2c98fde 1253 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1254 }
1255
1256 return RX_CONTINUE;
1257}
1258
49461622 1259static ieee80211_rx_result debug_noinline
5cf121c3 1260ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1261{
1262 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1263 struct sk_buff *skb = rx->skb;
1264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1266
1267 if (!sta)
9ae54c84 1268 return RX_CONTINUE;
571ecf67 1269
b291ba11
JB		 1270 /*
1271 * Update last_rx only for IBSS packets which are for the current
1272 * BSSID to avoid keeping the current IBSS network alive in cases
1273 * where other STAs start using different BSSID.
1274 */
05c914fe 1275 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1276 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1277 NL80211_IFTYPE_ADHOC);
3af6334c 1278 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1279 sta->last_rx = jiffies;
3af6334c
FF		 1280 if (ieee80211_is_data(hdr->frame_control)) {
1281 sta->last_rx_rate_idx = status->rate_idx;
1282 sta->last_rx_rate_flag = status->flag;
1283 }
1284 }
b291ba11
JB		 1285 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1286 /*
33b64eb2
LCC		 1287 * Mesh beacons will update last_rx when if they are found to
1288 * match the current local configuration when processed.
571ecf67 1289 */
b291ba11 1290 sta->last_rx = jiffies;
3af6334c
FF		 1291 if (ieee80211_is_data(hdr->frame_control)) {
1292 sta->last_rx_rate_idx = status->rate_idx;
1293 sta->last_rx_rate_flag = status->flag;
1294 }
571ecf67
JB		 1295 }
1296
554891e6 1297 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1298 return RX_CONTINUE;
571ecf67 1299
3cf335d5
KV		 1300 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1301 ieee80211_sta_rx_notify(rx->sdata, hdr);
1302
571ecf67
JB		 1303 sta->rx_fragments++;
1304 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1305 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1306 sta->last_signal = status->signal;
1307 ewma_add(&sta->avg_signal, -status->signal);
1308 }
571ecf67 1309
72eaa43a
JB		 1310 /*
1311 * Change STA power saving mode only at the end of a frame
1312 * exchange sequence.
1313 */
d057e5a3
AN		 1314 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1315 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1316 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1317 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1318 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1319 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1320 /*
1321 * Ignore doze->wake transitions that are
1322 * indicated by non-data frames, the standard
1323 * is unclear here, but for example going to
1324 * PS mode and then scanning would cause a
1325 * doze->wake transition for the probe request,
1326 * and that is clearly undesirable.
1327 */
1328 if (ieee80211_is_data(hdr->frame_control) &&
1329 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1330 ap_sta_ps_end(sta);
72eaa43a
JB		 1331 } else {
1332 if (ieee80211_has_pm(hdr->frame_control))
1333 ap_sta_ps_start(sta);
1334 }
571ecf67
JB		 1335 }
1336
22403def
JB		 1337 /*
1338 * Drop (qos-)data::nullfunc frames silently, since they
1339 * are used only to control station power saving mode.
1340 */
1341 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1342 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1343 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1344
1345 /*
1346 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1347 * that was not moved to a 4-addr STA vlan yet send
1348 * the event to userspace and for older hostapd drop
1349 * the frame to the monitor interface.
d524215f
FF		 1350 */
1351 if (ieee80211_has_a4(hdr->frame_control) &&
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1353 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1354 !rx->sdata->u.vlan.sta))) {
1355 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1356 cfg80211_rx_unexpected_4addr_frame(
1357 rx->sdata->dev, sta->sta.addr,
1358 GFP_ATOMIC);
d524215f 1359 return RX_DROP_MONITOR;
e7f4a940 1360 }
22403def
JB		 1361 /*
1362 * Update counter and free packet here to avoid
1363 * counting this as a dropped packed.
1364 */
571ecf67
JB		 1365 sta->rx_packets++;
1366 dev_kfree_skb(rx->skb);
9ae54c84 1367 return RX_QUEUED;
571ecf67
JB		 1368 }
1369
9ae54c84 1370 return RX_CONTINUE;
571ecf67
JB		 1371} /* ieee80211_rx_h_sta_process */
1372
571ecf67
JB		 1373static inline struct ieee80211_fragment_entry *
1374ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1375 unsigned int frag, unsigned int seq, int rx_queue,
1376 struct sk_buff **skb)
1377{
1378 struct ieee80211_fragment_entry *entry;
1379 int idx;
1380
1381 idx = sdata->fragment_next;
1382 entry = &sdata->fragments[sdata->fragment_next++];
1383 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1384 sdata->fragment_next = 0;
1385
1386 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1387#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1388 struct ieee80211_hdr *hdr =
1389 (struct ieee80211_hdr *) entry->skb_list.next->data;
1390 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1391 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1392 "addr1=%pM addr2=%pM\n",
47846c9b 1393 sdata->name, idx,
571ecf67 1394 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1395 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1396#endif
571ecf67
JB		 1397 __skb_queue_purge(&entry->skb_list);
1398 }
1399
1400 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1401 *skb = NULL;
1402 entry->first_frag_time = jiffies;
1403 entry->seq = seq;
1404 entry->rx_queue = rx_queue;
1405 entry->last_frag = frag;
1406 entry->ccmp = 0;
1407 entry->extra_len = 0;
1408
1409 return entry;
1410}
1411
1412static inline struct ieee80211_fragment_entry *
1413ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1414 unsigned int frag, unsigned int seq,
571ecf67
JB		 1415 int rx_queue, struct ieee80211_hdr *hdr)
1416{
1417 struct ieee80211_fragment_entry *entry;
1418 int i, idx;
1419
1420 idx = sdata->fragment_next;
1421 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1422 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1423
1424 idx--;
1425 if (idx < 0)
1426 idx = IEEE80211_FRAGMENT_MAX - 1;
1427
1428 entry = &sdata->fragments[idx];
1429 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1430 entry->rx_queue != rx_queue ||
1431 entry->last_frag + 1 != frag)
1432 continue;
1433
b73d70ad 1434 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1435
b73d70ad
HH		 1436 /*
1437 * Check ftype and addresses are equal, else check next fragment
1438 */
1439 if (((hdr->frame_control ^ f_hdr->frame_control) &
1440 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1441 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1442 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1443 continue;
1444
ab46623e 1445 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1446 __skb_queue_purge(&entry->skb_list);
1447 continue;
1448 }
1449 return entry;
1450 }
1451
1452 return NULL;
1453}
1454
49461622 1455static ieee80211_rx_result debug_noinline
5cf121c3 1456ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1457{
1458 struct ieee80211_hdr *hdr;
1459 u16 sc;
358c8d9d 1460 __le16 fc;
571ecf67
JB		 1461 unsigned int frag, seq;
1462 struct ieee80211_fragment_entry *entry;
1463 struct sk_buff *skb;
554891e6 1464 struct ieee80211_rx_status *status;
571ecf67 1465
b73d70ad 1466 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1467 fc = hdr->frame_control;
571ecf67
JB		 1468 sc = le16_to_cpu(hdr->seq_ctrl);
1469 frag = sc & IEEE80211_SCTL_FRAG;
1470
358c8d9d 1471 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1472 (rx->skb)->len < 24 ||
1473 is_multicast_ether_addr(hdr->addr1))) {
1474 /* not fragmented */
1475 goto out;
1476 }
1477 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1478
e3cf8b3f
ZY		 1479 if (skb_linearize(rx->skb))
1480 return RX_DROP_UNUSABLE;
1481
058897a4
AK		 1482 /*
1483 * skb_linearize() might change the skb->data and
1484 * previously cached variables (in this case, hdr) need to
1485 * be refreshed with the new data.
1486 */
1487 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1488 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1489
1490 if (frag == 0) {
1491 /* This is the first fragment of a new frame. */
1492 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1493 rx->seqno_idx, &(rx->skb));
97359d12 1494 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1495 ieee80211_has_protected(fc)) {
9e26297a 1496 int queue = rx->security_idx;
571ecf67
JB		 1497 /* Store CCMP PN so that we can verify that the next
1498 * fragment has a sequential PN value. */
1499 entry->ccmp = 1;
1500 memcpy(entry->last_pn,
9190252c 1501 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1502 CCMP_PN_LEN);
1503 }
9ae54c84 1504 return RX_QUEUED;
571ecf67
JB		 1505 }
1506
1507 /* This is a fragment for a frame that should already be pending in
1508 * fragment cache. Add this fragment to the end of the pending entry.
1509 */
9e26297a
JB		 1510 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1511 rx->seqno_idx, hdr);
571ecf67
JB		 1512 if (!entry) {
1513 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1514 return RX_DROP_MONITOR;
571ecf67
JB		 1515 }
1516
1517 /* Verify that MPDUs within one MSDU have sequential PN values.
1518 * (IEEE 802.11i, 8.3.3.4.5) */
1519 if (entry->ccmp) {
1520 int i;
1521 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1522 int queue;
97359d12 1523 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1524 return RX_DROP_UNUSABLE;
571ecf67
JB		 1525 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1526 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1527 pn[i]++;
1528 if (pn[i])
1529 break;
1530 }
9e26297a 1531 queue = rx->security_idx;
9190252c 1532 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1533 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1534 return RX_DROP_UNUSABLE;
571ecf67
JB		 1535 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1536 }
1537
358c8d9d 1538 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1539 __skb_queue_tail(&entry->skb_list, rx->skb);
1540 entry->last_frag = frag;
1541 entry->extra_len += rx->skb->len;
358c8d9d 1542 if (ieee80211_has_morefrags(fc)) {
571ecf67 1543 rx->skb = NULL;
9ae54c84 1544 return RX_QUEUED;
571ecf67
JB		 1545 }
1546
1547 rx->skb = __skb_dequeue(&entry->skb_list);
1548 if (skb_tailroom(rx->skb) < entry->extra_len) {
1549 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1550 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1551 GFP_ATOMIC))) {
1552 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1553 __skb_queue_purge(&entry->skb_list);
e4c26add 1554 return RX_DROP_UNUSABLE;
571ecf67
JB		 1555 }
1556 }
1557 while ((skb = __skb_dequeue(&entry->skb_list))) {
1558 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1559 dev_kfree_skb(skb);
1560 }
1561
1562 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1563 status = IEEE80211_SKB_RXCB(rx->skb);
1564 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1565
1566 out:
1567 if (rx->sta)
1568 rx->sta->rx_packets++;
1569 if (is_multicast_ether_addr(hdr->addr1))
1570 rx->local->dot11MulticastReceivedFrameCount++;
1571 else
1572 ieee80211_led_rx(rx->local);
9ae54c84 1573 return RX_CONTINUE;
571ecf67
JB		 1574}
1575
76ee65bf 1576static int
5cf121c3 1577ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1578{
07346f81 1579 if (unlikely(!rx->sta ||
c2c98fde 1580 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1581 return -EACCES;
571ecf67 1582
76ee65bf 1583 return 0;
571ecf67
JB		 1584}
1585
76ee65bf 1586static int
358c8d9d 1587ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1588{
eb9fb5b8
JB		 1589 struct sk_buff *skb = rx->skb;
1590 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1591
3017b80b 1592 /*
7848ba7d
JB		 1593 * Pass through unencrypted frames if the hardware has
1594 * decrypted them already.
3017b80b 1595 */
eb9fb5b8 1596 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1597 return 0;
571ecf67
JB		 1598
1599 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1600 if (unlikely(!ieee80211_has_protected(fc) &&
1601 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1602 ieee80211_is_data(fc) &&
b3fc9c6c 1603 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1604 return -EACCES;
bef5d1c7
JB		 1605
1606 return 0;
1607}
1608
1609static int
1610ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1611{
1612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1613 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1614 __le16 fc = hdr->frame_control;
bef5d1c7 1615
e3efca0a
JM		 1616 /*
1617 * Pass through unencrypted frames if the hardware has
1618 * decrypted them already.
1619 */
1620 if (status->flag & RX_FLAG_DECRYPTED)
1621 return 0;
bef5d1c7 1622
c2c98fde 1623 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1624 if (unlikely(!ieee80211_has_protected(fc) &&
1625 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1626 rx->key)) {
1627 if (ieee80211_is_deauth(fc))
1628 cfg80211_send_unprot_deauth(rx->sdata->dev,
1629 rx->skb->data,
1630 rx->skb->len);
1631 else if (ieee80211_is_disassoc(fc))
1632 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1633 rx->skb->data,
1634 rx->skb->len);
f2ca3ea4 1635 return -EACCES;
cf4e594e 1636 }
f2ca3ea4 1637 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1638 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1639 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1640 if (ieee80211_is_deauth(fc))
1641 cfg80211_send_unprot_deauth(rx->sdata->dev,
1642 rx->skb->data,
1643 rx->skb->len);
1644 else if (ieee80211_is_disassoc(fc))
1645 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1646 rx->skb->data,
1647 rx->skb->len);
f2ca3ea4 1648 return -EACCES;
cf4e594e 1649 }
f2ca3ea4
JM		 1650 /*
1651 * When using MFP, Action frames are not allowed prior to
1652 * having configured keys.
1653 */
1654 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1655 ieee80211_is_robust_mgmt_frame(
1656 (struct ieee80211_hdr *) rx->skb->data)))
1657 return -EACCES;
1658 }
b3fc9c6c 1659
76ee65bf 1660 return 0;
571ecf67
JB		 1661}
1662
76ee65bf 1663static int
4114fa21 1664__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1665{
eb9fb5b8 1666 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1667 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1668 bool check_port_control = false;
1669 struct ethhdr *ehdr;
1670 int ret;
f14543ee 1671
4114fa21 1672 *port_control = false;
9bc383de
JB		 1673 if (ieee80211_has_a4(hdr->frame_control) &&
1674 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1675 return -1;
9bc383de 1676
fbb327c5
FF		 1677 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1678 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1679
1680 if (!sdata->u.mgd.use_4addr)
1681 return -1;
1682 else
1683 check_port_control = true;
1684 }
1685
9bc383de 1686 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1687 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1688 return -1;
571ecf67 1689
fbb327c5 1690 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1691 if (ret < 0)
fbb327c5
FF		 1692 return ret;
1693
1694 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1695 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1696 *port_control = true;
1697 else if (check_port_control)
fbb327c5
FF		 1698 return -1;
1699
1700 return 0;
76ee65bf 1701}
571ecf67 1702
ce3edf6d
JB		 1703/*
1704 * requires that rx->skb is a frame with ethernet header
1705 */
358c8d9d 1706static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1707{
c97c23e3 1708 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1709 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1710 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1711
1712 /*
1713 * Allow EAPOL frames to us/the PAE group address regardless
1714 * of whether the frame was encrypted or not.
1715 */
a621fa4d 1716 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1717 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1718 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1719 return true;
1720
1721 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1722 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1723 return false;
1724
1725 return true;
1726}
1727
1728/*
1729 * requires that rx->skb is a frame with ethernet header
1730 */
76ee65bf 1731static void
5cf121c3 1732ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1733{
eb9fb5b8
JB		 1734 struct ieee80211_sub_if_data *sdata = rx->sdata;
1735 struct net_device *dev = sdata->dev;
76ee65bf 1736 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1737 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1738 struct sta_info *dsta;
554891e6 1739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1740
76ee65bf
RR		 1741 skb = rx->skb;
1742 xmit_skb = NULL;
571ecf67 1743
05c914fe
JB		 1744 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1745 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1746 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1747 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1748 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1749 if (is_multicast_ether_addr(ehdr->h_dest)) {
1750 /*
1751 * send multicast frames both to higher layers in
1752 * local net stack and back to the wireless medium
1753 */
76ee65bf
RR		 1754 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1755 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1756 printk(KERN_DEBUG "%s: failed to clone "
1757 "multicast frame\n", dev->name);
1758 } else {
abe60632
JB		 1759 dsta = sta_info_get(sdata, skb->data);
1760 if (dsta) {
ce3edf6d
JB		 1761 /*
1762 * The destination station is associated to
1763 * this AP (in this VLAN), so send the frame
1764 * directly to it and do not pass it to local
1765 * net stack.
571ecf67 1766 */
76ee65bf 1767 xmit_skb = skb;
571ecf67
JB		 1768 skb = NULL;
1769 }
571ecf67
JB		 1770 }
1771 }
1772
1773 if (skb) {
d1c3a37c
JB		 1774 int align __maybe_unused;
1775
59d9cb07 1776#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1777 /*
1778 * 'align' will only take the values 0 or 2 here
1779 * since all frames are required to be aligned
1780 * to 2-byte boundaries when being passed to
1781 * mac80211. That also explains the __skb_push()
1782 * below.
1783 */
dacb6f1d 1784 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1785 if (align) {
1786 if (WARN_ON(skb_headroom(skb) < 3)) {
1787 dev_kfree_skb(skb);
1788 skb = NULL;
1789 } else {
1790 u8 *data = skb->data;
8ce0b589
ZY		 1791 size_t len = skb_headlen(skb);
1792 skb->data -= align;
1793 memmove(skb->data, data, len);
1794 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1795 }
1796 }
1797#endif
1798
1799 if (skb) {
1800 /* deliver to local stack */
1801 skb->protocol = eth_type_trans(skb, dev);
1802 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1803 netif_receive_skb(skb);
d1c3a37c 1804 }
571ecf67
JB		 1805 }
1806
76ee65bf 1807 if (xmit_skb) {
aef6c928
HS		 1808 /*
1809 * Send to wireless media and increase priority by 256 to
1810 * keep the received priority instead of reclassifying
1811 * the frame (see cfg80211_classify8021d).
1812 */
1813 xmit_skb->priority += 256;
f831e909 1814 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1815 skb_reset_network_header(xmit_skb);
1816 skb_reset_mac_header(xmit_skb);
76ee65bf 1817 dev_queue_xmit(xmit_skb);
571ecf67 1818 }
76ee65bf
RR		 1819}
1820
49461622 1821static ieee80211_rx_result debug_noinline
5cf121c3 1822ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1823{
eb9fb5b8 1824 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1825 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1827 __le16 fc = hdr->frame_control;
eaf85ca7 1828 struct sk_buff_head frame_list;
554891e6 1829 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1830
358c8d9d 1831 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1832 return RX_CONTINUE;
fd4c7f2f 1833
358c8d9d 1834 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1835 return RX_DROP_MONITOR;
fd4c7f2f 1836
554891e6 1837 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1838 return RX_CONTINUE;
fd4c7f2f 1839
eaf85ca7
ZY		 1840 if (ieee80211_has_a4(hdr->frame_control) &&
1841 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842 !rx->sdata->u.vlan.sta)
e4c26add 1843 return RX_DROP_UNUSABLE;
fd4c7f2f 1844
eaf85ca7
ZY		 1845 if (is_multicast_ether_addr(hdr->addr1) &&
1846 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847 rx->sdata->u.vlan.sta) ||
1848 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1849 rx->sdata->u.mgd.use_4addr)))
e4c26add 1850 return RX_DROP_UNUSABLE;
fd4c7f2f 1851
eaf85ca7
ZY		 1852 skb->dev = dev;
1853 __skb_queue_head_init(&frame_list);
fd4c7f2f 1854
e3cf8b3f
ZY		 1855 if (skb_linearize(skb))
1856 return RX_DROP_UNUSABLE;
1857
eaf85ca7
ZY		 1858 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1859 rx->sdata->vif.type,
8b3becad 1860 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1861
eaf85ca7
ZY		 1862 while (!skb_queue_empty(&frame_list)) {
1863 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1864
358c8d9d 1865 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1866 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1867 continue;
1868 }
eaf85ca7
ZY		 1869 dev->stats.rx_packets++;
1870 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1871
1872 ieee80211_deliver_skb(rx);
1873 }
1874
9ae54c84 1875 return RX_QUEUED;
fd4c7f2f
RR		 1876}
1877
bf94e17b 1878#ifdef CONFIG_MAC80211_MESH
b0dee578 1879static ieee80211_rx_result
e32f85f7
LCC		 1880ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881{
30789eb6
TP		 1882 struct ieee80211_hdr *fwd_hdr, *hdr;
1883 struct ieee80211_tx_info *info;
e32f85f7 1884 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1885 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1886 struct ieee80211_local *local = rx->local;
eb9fb5b8 1887 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1889 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1890 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1891 u16 q, hdrlen;
e32f85f7
LCC		 1892
1893 hdr = (struct ieee80211_hdr *) skb->data;
1894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1895 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1896
2157fdd6
TP		 1897 /* frame is in RMC, don't forward */
1898 if (ieee80211_is_data(hdr->frame_control) &&
1899 is_multicast_ether_addr(hdr->addr1) &&
1900 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1901 return RX_DROP_MONITOR;
1902
e32f85f7
LCC		 1903 if (!ieee80211_is_data(hdr->frame_control))
1904 return RX_CONTINUE;
1905
1906 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1907 return RX_DROP_MONITOR;
1908
43b7b314 1909 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1910 struct mesh_path *mppath;
43b7b314
JC		 1911 char *proxied_addr;
1912 char *mpp_addr;
1913
1914 if (is_multicast_ether_addr(hdr->addr1)) {
1915 mpp_addr = hdr->addr3;
1916 proxied_addr = mesh_hdr->eaddr1;
1917 } else {
1918 mpp_addr = hdr->addr4;
1919 proxied_addr = mesh_hdr->eaddr2;
1920 }
79617dee 1921
79617dee 1922 rcu_read_lock();
43b7b314 1923 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1924 if (!mppath) {
43b7b314 1925 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1926 } else {
1927 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1928 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1929 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1930 spin_unlock_bh(&mppath->state_lock);
1931 }
1932 rcu_read_unlock();
1933 }
1934
3c5772a5
JC		 1935 /* Frame has reached destination. Don't forward */
1936 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1937 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1938 return RX_CONTINUE;
1939
d3c1597b
TP		 1940 q = ieee80211_select_queue_80211(local, skb, hdr);
1941 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1942 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1943 return RX_DROP_MONITOR;
1944 }
1945 skb_set_queue_mapping(skb, q);
e32f85f7 1946
30789eb6
TP		 1947 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1948 goto out;
c8a61a7d 1949
30789eb6
TP		 1950 if (!--mesh_hdr->ttl) {
1951 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1952 return RX_DROP_MONITOR;
1953 }
1954
d665508b
CYY		 1955 if (!ifmsh->mshcfg.dot11MeshForwarding)
1956 goto out;
1957
30789eb6
TP		 1958 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1959 if (!fwd_skb) {
1960 if (net_ratelimit())
1961 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1962 sdata->name);
1963 goto out;
1964 }
1965
1966 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1967 info = IEEE80211_SKB_CB(fwd_skb);
1968 memset(info, 0, sizeof(*info));
1969 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1970 info->control.vif = &rx->sdata->vif;
1971 info->control.jiffies = jiffies;
1972 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1973 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1974 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1975 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1976 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1977 } else {
1978 /* unable to resolve next hop */
1979 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1980 0, reason, fwd_hdr->addr2, sdata);
1981 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1982 kfree_skb(fwd_skb);
30789eb6 1983 return RX_DROP_MONITOR;
e32f85f7
LCC		 1984 }
1985
30789eb6
TP		 1986 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1987 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1988 out:
3c5772a5 1989 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1990 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1991 return RX_CONTINUE;
1992 else
1993 return RX_DROP_MONITOR;
1994}
bf94e17b 1995#endif
e32f85f7 1996
49461622 1997static ieee80211_rx_result debug_noinline
5cf121c3 1998ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1999{
eb9fb5b8 2000 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2001 struct ieee80211_local *local = rx->local;
eb9fb5b8 2002 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2003 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2004 __le16 fc = hdr->frame_control;
4114fa21 2005 bool port_control;
ce3edf6d 2006 int err;
76ee65bf 2007
358c8d9d 2008 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2009 return RX_CONTINUE;
76ee65bf 2010
358c8d9d 2011 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2012 return RX_DROP_MONITOR;
76ee65bf 2013
f14543ee 2014 /*
e7f4a940
JB		 2015 * Send unexpected-4addr-frame event to hostapd. For older versions,
2016 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2017 */
2018 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2019 sdata->vif.type == NL80211_IFTYPE_AP) {
2020 if (rx->sta &&
2021 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2022 cfg80211_rx_unexpected_4addr_frame(
2023 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2024 return RX_DROP_MONITOR;
e7f4a940 2025 }
f14543ee 2026
4114fa21 2027 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2028 if (unlikely(err))
e4c26add 2029 return RX_DROP_UNUSABLE;
76ee65bf 2030
358c8d9d 2031 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2032 return RX_DROP_MONITOR;
ce3edf6d 2033
4114fa21
FF		 2034 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2035 unlikely(port_control) && sdata->bss) {
2036 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2037 u.ap);
2038 dev = sdata->dev;
2039 rx->sdata = sdata;
2040 }
2041
76ee65bf
RR		 2042 rx->skb->dev = dev;
2043
2044 dev->stats.rx_packets++;
2045 dev->stats.rx_bytes += rx->skb->len;
2046
08ca944e 2047 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2048 !is_multicast_ether_addr(
2049 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2050 (!local->scanning &&
2051 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2052 mod_timer(&local->dynamic_ps_timer, jiffies +
2053 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2054 }
2055
76ee65bf 2056 ieee80211_deliver_skb(rx);
571ecf67 2057
9ae54c84 2058 return RX_QUEUED;
571ecf67
JB		 2059}
2060
49461622 2061static ieee80211_rx_result debug_noinline
24a8fdad 2062ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2063{
2064 struct ieee80211_local *local = rx->local;
2065 struct ieee80211_hw *hw = &local->hw;
2066 struct sk_buff *skb = rx->skb;
a7767f95 2067 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2068 struct tid_ampdu_rx *tid_agg_rx;
2069 u16 start_seq_num;
2070 u16 tid;
2071
a7767f95 2072 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2073 return RX_CONTINUE;
71364716 2074
a7767f95 2075 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2076 struct {
2077 __le16 control, start_seq_num;
2078 } __packed bar_data;
2079
71364716 2080 if (!rx->sta)
a02ae758 2081 return RX_DROP_MONITOR;
8ae5977f
JB		 2082
2083 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2084 &bar_data, sizeof(bar_data)))
2085 return RX_DROP_MONITOR;
2086
8ae5977f 2087 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2088
2089 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2090 if (!tid_agg_rx)
a02ae758 2091 return RX_DROP_MONITOR;
71364716 2092
8ae5977f 2093 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2094
2095 /* reset session timer */
20ad19d0
JB		 2096 if (tid_agg_rx->timeout)
2097 mod_timer(&tid_agg_rx->session_timer,
2098 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2099
dd318575 2100 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2101 /* release stored frames up to start of BAR */
24a8fdad 2102 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2103 spin_unlock(&tid_agg_rx->reorder_lock);
2104
a02ae758
JB		 2105 kfree_skb(skb);
2106 return RX_QUEUED;
71364716
RR		 2107 }
2108
08daecae
JB		 2109 /*
2110 * After this point, we only want management frames,
2111 * so we can drop all remaining control frames to
2112 * cooked monitor interfaces.
2113 */
2114 return RX_DROP_MONITOR;
71364716
RR		 2115}
2116
f4f727a6
JM		 2117static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2118 struct ieee80211_mgmt *mgmt,
2119 size_t len)
fea14732
JM		 2120{
2121 struct ieee80211_local *local = sdata->local;
2122 struct sk_buff *skb;
2123 struct ieee80211_mgmt *resp;
2124
47846c9b 2125 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2126 /* Not to own unicast address */
2127 return;
2128 }
2129
46900298
JB		 2130 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2131 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2132 /* Not from the current AP or not associated yet. */
fea14732
JM		 2133 return;
2134 }
2135
2136 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2137 /* Too short SA Query request frame */
2138 return;
2139 }
2140
2141 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2142 if (skb == NULL)
2143 return;
2144
2145 skb_reserve(skb, local->hw.extra_tx_headroom);
2146 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2147 memset(resp, 0, 24);
2148 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2149 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2150 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2151 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2152 IEEE80211_STYPE_ACTION);
2153 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2154 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2155 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2156 memcpy(resp->u.action.u.sa_query.trans_id,
2157 mgmt->u.action.u.sa_query.trans_id,
2158 WLAN_SA_QUERY_TR_ID_LEN);
2159
62ae67be 2160 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2161}
2162
2e161f78
JB		 2163static ieee80211_rx_result debug_noinline
2164ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2165{
2166 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2167 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2168
2169 /*
2170 * From here on, look only at management frames.
2171 * Data and control frames are already handled,
2172 * and unknown (reserved) frames are useless.
2173 */
2174 if (rx->skb->len < 24)
2175 return RX_DROP_MONITOR;
2176
2177 if (!ieee80211_is_mgmt(mgmt->frame_control))
2178 return RX_DROP_MONITOR;
2179
ee971924
JB		 2180 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2181 ieee80211_is_beacon(mgmt->frame_control) &&
2182 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2183 int sig = 0;
2184
2185 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2186 sig = status->signal;
2187
ee971924
JB		 2188 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2189 rx->skb->data, rx->skb->len,
804483e9 2190 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2191 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2192 }
2193
554891e6 2194 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2195 return RX_DROP_MONITOR;
2196
2197 if (ieee80211_drop_unencrypted_mgmt(rx))
2198 return RX_DROP_UNUSABLE;
2199
2200 return RX_CONTINUE;
2201}
2202
de1ede7a
JB		 2203static ieee80211_rx_result debug_noinline
2204ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2205{
2206 struct ieee80211_local *local = rx->local;
eb9fb5b8 2207 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2208 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2209 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2210 int len = rx->skb->len;
2211
2212 if (!ieee80211_is_action(mgmt->frame_control))
2213 return RX_CONTINUE;
2214
026331c4
JM		 2215 /* drop too small frames */
2216 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2217 return RX_DROP_UNUSABLE;
de1ede7a 2218
026331c4 2219 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2220 return RX_DROP_UNUSABLE;
de1ede7a 2221
554891e6 2222 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2223 return RX_DROP_UNUSABLE;
97ebe12a 2224
de1ede7a 2225 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2226 case WLAN_CATEGORY_HT:
2227 /* reject HT action frames from stations not supporting HT */
2228 if (!rx->sta->sta.ht_cap.ht_supported)
2229 goto invalid;
2230
2231 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2232 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2233 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2234 sdata->vif.type != NL80211_IFTYPE_AP &&
2235 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2236 break;
2237
2238 /* verify action & smps_control are present */
2239 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2240 goto invalid;
2241
2242 switch (mgmt->u.action.u.ht_smps.action) {
2243 case WLAN_HT_ACTION_SMPS: {
2244 struct ieee80211_supported_band *sband;
2245 u8 smps;
2246
2247 /* convert to HT capability */
2248 switch (mgmt->u.action.u.ht_smps.smps_control) {
2249 case WLAN_HT_SMPS_CONTROL_DISABLED:
2250 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2251 break;
2252 case WLAN_HT_SMPS_CONTROL_STATIC:
2253 smps = WLAN_HT_CAP_SM_PS_STATIC;
2254 break;
2255 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2256 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2257 break;
2258 default:
2259 goto invalid;
2260 }
2261 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2262
2263 /* if no change do nothing */
2264 if ((rx->sta->sta.ht_cap.cap &
2265 IEEE80211_HT_CAP_SM_PS) == smps)
2266 goto handled;
2267
2268 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2269 rx->sta->sta.ht_cap.cap |= smps;
2270
2271 sband = rx->local->hw.wiphy->bands[status->band];
2272
64f68e5d
JB		 2273 rate_control_rate_update(local, sband, rx->sta,
2274 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2275 goto handled;
2276 }
2277 default:
2278 goto invalid;
2279 }
2280
2281 break;
de1ede7a 2282 case WLAN_CATEGORY_BACK:
8abd3f9b 2283 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2284 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2285 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2286 sdata->vif.type != NL80211_IFTYPE_AP &&
2287 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2288 break;
8abd3f9b 2289
026331c4
JM		 2290 /* verify action_code is present */
2291 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2292 break;
2293
de1ede7a
JB		 2294 switch (mgmt->u.action.u.addba_req.action_code) {
2295 case WLAN_ACTION_ADDBA_REQ:
2296 if (len < (IEEE80211_MIN_ACTION_SIZE +
2297 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2298 goto invalid;
2299 break;
de1ede7a
JB		 2300 case WLAN_ACTION_ADDBA_RESP:
2301 if (len < (IEEE80211_MIN_ACTION_SIZE +
2302 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2303 goto invalid;
2304 break;
de1ede7a
JB		 2305 case WLAN_ACTION_DELBA:
2306 if (len < (IEEE80211_MIN_ACTION_SIZE +
2307 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2308 goto invalid;
2309 break;
2310 default:
2311 goto invalid;
de1ede7a 2312 }
bed7ee6e 2313
8b58ff83 2314 goto queue;
39192c0b
JB		 2315 case WLAN_CATEGORY_SPECTRUM_MGMT:
2316 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2317 break;
46900298
JB		 2318
2319 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2320 break;
46900298 2321
026331c4
JM		 2322 /* verify action_code is present */
2323 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2324 break;
2325
39192c0b
JB		 2326 switch (mgmt->u.action.u.measurement.action_code) {
2327 case WLAN_ACTION_SPCT_MSR_REQ:
2328 if (len < (IEEE80211_MIN_ACTION_SIZE +
2329 sizeof(mgmt->u.action.u.measurement)))
84040805 2330 break;
39192c0b 2331 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2332 goto handled;
c481ec97
S		 2333 case WLAN_ACTION_SPCT_CHL_SWITCH:
2334 if (len < (IEEE80211_MIN_ACTION_SIZE +
2335 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2336 break;
c481ec97 2337
cc32abd4 2338 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2339 break;
cc32abd4 2340
888d04df 2341 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2342 break;
c481ec97 2343
8b58ff83 2344 goto queue;
39192c0b
JB		 2345 }
2346 break;
fea14732
JM		 2347 case WLAN_CATEGORY_SA_QUERY:
2348 if (len < (IEEE80211_MIN_ACTION_SIZE +
2349 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2350 break;
2351
fea14732
JM		 2352 switch (mgmt->u.action.u.sa_query.action) {
2353 case WLAN_ACTION_SA_QUERY_REQUEST:
2354 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2355 break;
fea14732 2356 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2357 goto handled;
fea14732
JM		 2358 }
2359 break;
8db09850
TP		 2360 case WLAN_CATEGORY_SELF_PROTECTED:
2361 switch (mgmt->u.action.u.self_prot.action_code) {
2362 case WLAN_SP_MESH_PEERING_OPEN:
2363 case WLAN_SP_MESH_PEERING_CLOSE:
2364 case WLAN_SP_MESH_PEERING_CONFIRM:
2365 if (!ieee80211_vif_is_mesh(&sdata->vif))
2366 goto invalid;
2367 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2368 /* userspace handles this frame */
2369 break;
2370 goto queue;
2371 case WLAN_SP_MGK_INFORM:
2372 case WLAN_SP_MGK_ACK:
2373 if (!ieee80211_vif_is_mesh(&sdata->vif))
2374 goto invalid;
2375 break;
2376 }
2377 break;
d3aaec8a 2378 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2379 if (!ieee80211_vif_is_mesh(&sdata->vif))
2380 break;
25d49e4d
TP		 2381 if (mesh_action_is_path_sel(mgmt) &&
2382 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2383 break;
2384 goto queue;
84040805 2385 }
026331c4 2386
2e161f78
JB		 2387 return RX_CONTINUE;
2388
bed7ee6e 2389 invalid:
554891e6 2390 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2391 /* will return in the next handlers */
2392 return RX_CONTINUE;
2393
2394 handled:
2395 if (rx->sta)
2396 rx->sta->rx_packets++;
2397 dev_kfree_skb(rx->skb);
2398 return RX_QUEUED;
2399
2400 queue:
2401 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2402 skb_queue_tail(&sdata->skb_queue, rx->skb);
2403 ieee80211_queue_work(&local->hw, &sdata->work);
2404 if (rx->sta)
2405 rx->sta->rx_packets++;
2406 return RX_QUEUED;
2407}
2408
2409static ieee80211_rx_result debug_noinline
2410ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2411{
554891e6 2412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2413 int sig = 0;
2e161f78
JB		 2414
2415 /* skip known-bad action frames and return them in the next handler */
554891e6 2416 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2417 return RX_CONTINUE;
d7907448 2418
026331c4
JM		 2419 /*
2420 * Getting here means the kernel doesn't know how to handle
2421 * it, but maybe userspace does ... include returned frames
2422 * so userspace can register for those to know whether ones
2423 * it transmitted were processed or returned.
2424 */
026331c4 2425
804483e9
JB		 2426 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2427 sig = status->signal;
2428
2429 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2e161f78
JB		 2430 rx->skb->data, rx->skb->len,
2431 GFP_ATOMIC)) {
2432 if (rx->sta)
2433 rx->sta->rx_packets++;
2434 dev_kfree_skb(rx->skb);
2435 return RX_QUEUED;
2436 }
2437
2438
2439 return RX_CONTINUE;
2440}
2441
2442static ieee80211_rx_result debug_noinline
2443ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2444{
2445 struct ieee80211_local *local = rx->local;
2446 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2447 struct sk_buff *nskb;
2448 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2449 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2450
2451 if (!ieee80211_is_action(mgmt->frame_control))
2452 return RX_CONTINUE;
2453
2454 /*
2455 * For AP mode, hostapd is responsible for handling any action
2456 * frames that we didn't handle, including returning unknown
2457 * ones. For all other modes we will return them to the sender,
2458 * setting the 0x80 bit in the action category, as required by
2459 * 802.11-2007 7.3.1.11.
2460 * Newer versions of hostapd shall also use the management frame
2461 * registration mechanisms, but older ones still use cooked
2462 * monitor interfaces so push all frames there.
2463 */
554891e6 2464 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2465 (sdata->vif.type == NL80211_IFTYPE_AP ||
2466 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2467 return RX_DROP_MONITOR;
026331c4 2468
84040805
JB		 2469 /* do not return rejected action frames */
2470 if (mgmt->u.action.category & 0x80)
2471 return RX_DROP_UNUSABLE;
2472
2473 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2474 GFP_ATOMIC);
2475 if (nskb) {
292b4df6 2476 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2477
292b4df6
JL		 2478 nmgmt->u.action.category |= 0x80;
2479 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2480 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2481
2482 memset(nskb->cb, 0, sizeof(nskb->cb));
2483
2484 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2485 }
39192c0b
JB		 2486 dev_kfree_skb(rx->skb);
2487 return RX_QUEUED;
de1ede7a
JB		 2488}
2489
49461622 2490static ieee80211_rx_result debug_noinline
5cf121c3 2491ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2492{
eb9fb5b8 2493 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2494 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2495 __le16 stype;
571ecf67 2496
77a121c3 2497 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2498
77a121c3
JB		 2499 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2500 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2501 sdata->vif.type != NL80211_IFTYPE_STATION)
2502 return RX_DROP_MONITOR;
472dbc45 2503
77a121c3 2504 switch (stype) {
66e67e41 2505 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2506 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2507 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2508 /* process for all: mesh, mlme, ibss */
2509 break;
66e67e41
JB		 2510 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2511 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2512 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2513 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2514 if (is_multicast_ether_addr(mgmt->da) &&
2515 !is_broadcast_ether_addr(mgmt->da))
2516 return RX_DROP_MONITOR;
2517
77a121c3
JB		 2518 /* process only for station */
2519 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2520 return RX_DROP_MONITOR;
2521 break;
2522 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2523 /* process only for ibss */
2524 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2525 return RX_DROP_MONITOR;
2526 break;
2527 default:
2528 return RX_DROP_MONITOR;
2529 }
f9d540ee 2530
77a121c3 2531 /* queue up frame and kick off work to process it */
c1475ca9 2532 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2533 skb_queue_tail(&sdata->skb_queue, rx->skb);
2534 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2535 if (rx->sta)
2536 rx->sta->rx_packets++;
46900298 2537
77a121c3 2538 return RX_QUEUED;
571ecf67
JB		 2539}
2540
5cf121c3 2541/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2542static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2543 struct ieee80211_rate *rate)
3d30d949
MW		 2544{
2545 struct ieee80211_sub_if_data *sdata;
2546 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2547 struct sk_buff *skb = rx->skb, *skb2;
2548 struct net_device *prev_dev = NULL;
eb9fb5b8 2549 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2550 int needed_headroom;
3d30d949 2551
554891e6
JB		 2552 /*
2553 * If cooked monitor has been processed already, then
2554 * don't do it again. If not, set the flag.
2555 */
2556 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2557 goto out_free_skb;
554891e6 2558 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2559
152c477a
JB		 2560 /* If there are no cooked monitor interfaces, just free the SKB */
2561 if (!local->cooked_mntrs)
2562 goto out_free_skb;
2563
293702a3
JB		 2564 /* room for the radiotap header based on driver features */
2565 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2566
293702a3
JB		 2567 if (skb_headroom(skb) < needed_headroom &&
2568 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2569 goto out_free_skb;
3d30d949 2570
293702a3 2571 /* prepend radiotap information */
973ef21a
FF		 2572 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2573 false);
3d30d949
MW		 2574
2575 skb_set_mac_header(skb, 0);
2576 skb->ip_summed = CHECKSUM_UNNECESSARY;
2577 skb->pkt_type = PACKET_OTHERHOST;
2578 skb->protocol = htons(ETH_P_802_2);
2579
2580 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2581 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2582 continue;
2583
05c914fe 2584 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2585 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2586 continue;
2587
2588 if (prev_dev) {
2589 skb2 = skb_clone(skb, GFP_ATOMIC);
2590 if (skb2) {
2591 skb2->dev = prev_dev;
5548a8a1 2592 netif_receive_skb(skb2);
3d30d949
MW		 2593 }
2594 }
2595
2596 prev_dev = sdata->dev;
2597 sdata->dev->stats.rx_packets++;
2598 sdata->dev->stats.rx_bytes += skb->len;
2599 }
2600
2601 if (prev_dev) {
2602 skb->dev = prev_dev;
5548a8a1 2603 netif_receive_skb(skb);
554891e6
JB		 2604 return;
2605 }
3d30d949
MW		 2606
2607 out_free_skb:
2608 dev_kfree_skb(skb);
2609}
2610
aa0c8636
CL		 2611static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2612 ieee80211_rx_result res)
2613{
2614 switch (res) {
2615 case RX_DROP_MONITOR:
2616 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2617 if (rx->sta)
2618 rx->sta->rx_dropped++;
2619 /* fall through */
2620 case RX_CONTINUE: {
2621 struct ieee80211_rate *rate = NULL;
2622 struct ieee80211_supported_band *sband;
2623 struct ieee80211_rx_status *status;
2624
2625 status = IEEE80211_SKB_RXCB((rx->skb));
2626
2627 sband = rx->local->hw.wiphy->bands[status->band];
2628 if (!(status->flag & RX_FLAG_HT))
2629 rate = &sband->bitrates[status->rate_idx];
2630
2631 ieee80211_rx_cooked_monitor(rx, rate);
2632 break;
2633 }
2634 case RX_DROP_UNUSABLE:
2635 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2636 if (rx->sta)
2637 rx->sta->rx_dropped++;
2638 dev_kfree_skb(rx->skb);
2639 break;
2640 case RX_QUEUED:
2641 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2642 break;
2643 }
2644}
571ecf67 2645
24a8fdad 2646static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2647{
58905290 2648 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2649 struct sk_buff *skb;
8944b79f 2650
e32f85f7
LCC		 2651#define CALL_RXH(rxh) \
2652 do { \
2653 res = rxh(rx); \
2654 if (res != RX_CONTINUE) \
2569a826 2655 goto rxh_next; \
e32f85f7 2656 } while (0);
49461622 2657
24a8fdad
CL		 2658 spin_lock(&rx->local->rx_skb_queue.lock);
2659 if (rx->local->running_rx_handler)
2660 goto unlock;
2661
2662 rx->local->running_rx_handler = true;
2663
2664 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2665 spin_unlock(&rx->local->rx_skb_queue.lock);
2666
2569a826
JB		 2667 /*
2668 * all the other fields are valid across frames
2669 * that belong to an aMPDU since they are on the
2670 * same TID from the same station
2671 */
2672 rx->skb = skb;
2673
2674 CALL_RXH(ieee80211_rx_h_decrypt)
2675 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2676 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2677 CALL_RXH(ieee80211_rx_h_sta_process)
2678 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2679 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2680 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2681#ifdef CONFIG_MAC80211_MESH
aa0c8636 2682 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2683 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2684#endif
2154c81c 2685 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2686 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2687 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2688 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2689 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2690 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2691 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2692 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2693
aa0c8636
CL		 2694 rxh_next:
2695 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2696 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2697#undef CALL_RXH
aa0c8636 2698 }
24a8fdad
CL		 2699
2700 rx->local->running_rx_handler = false;
2701
2702 unlock:
2703 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2704}
2705
4406c376 2706static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2707{
aa0c8636
CL		 2708 ieee80211_rx_result res = RX_DROP_MONITOR;
2709
aa0c8636
CL		 2710#define CALL_RXH(rxh) \
2711 do { \
2712 res = rxh(rx); \
2713 if (res != RX_CONTINUE) \
2714 goto rxh_next; \
2715 } while (0);
2716
2717 CALL_RXH(ieee80211_rx_h_passive_scan)
2718 CALL_RXH(ieee80211_rx_h_check)
2719
24a8fdad 2720 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2721
24a8fdad 2722 ieee80211_rx_handlers(rx);
aa0c8636 2723 return;
49461622 2724
2569a826 2725 rxh_next:
aa0c8636
CL		 2726 ieee80211_rx_handlers_result(rx, res);
2727
2728#undef CALL_RXH
58905290
JB		 2729}
2730
2bff8ebf 2731/*
dd318575
JB		 2732 * This function makes calls into the RX path, therefore
2733 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2734 */
2735void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2736{
554891e6
JB		 2737 struct ieee80211_rx_data rx = {
2738 .sta = sta,
2739 .sdata = sta->sdata,
2740 .local = sta->local,
9e26297a
JB		 2741 /* This is OK -- must be QoS data frame */
2742 .security_idx = tid,
2743 .seqno_idx = tid,
fcf8bd3b 2744 .flags = 0,
554891e6 2745 };
2c15a0cf
CL		 2746 struct tid_ampdu_rx *tid_agg_rx;
2747
2748 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2749 if (!tid_agg_rx)
2750 return;
2bff8ebf 2751
2c15a0cf 2752 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2753 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2754 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2755
24a8fdad 2756 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2757}
2758
571ecf67
JB		 2759/* main receive path */
2760
20b01f80 2761static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2762 struct ieee80211_hdr *hdr)
2763{
20b01f80 2764 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2765 struct sk_buff *skb = rx->skb;
2766 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2767 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2768 int multicast = is_multicast_ether_addr(hdr->addr1);
2769
51fb61e7 2770 switch (sdata->vif.type) {
05c914fe 2771 case NL80211_IFTYPE_STATION:
9bc383de 2772 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2773 return 0;
77fdaa12 2774 if (!multicast &&
47846c9b 2775 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2776 if (!(sdata->dev->flags & IFF_PROMISC) ||
2777 sdata->u.mgd.use_4addr)
23a24def 2778 return 0;
554891e6 2779 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2780 }
2781 break;
05c914fe 2782 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2783 if (!bssid)
2784 return 0;
a7767f95 2785 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2786 return 1;
87291c02 2787 }
46900298 2788 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2789 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2790 return 0;
554891e6 2791 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2792 } else if (!multicast &&
47846c9b 2793 compare_ether_addr(sdata->vif.addr,
23a24def 2794 hdr->addr1) != 0) {
4150c572 2795 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2796 return 0;
554891e6 2797 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2798 } else if (!rx->sta) {
2799 int rate_idx;
eb9fb5b8 2800 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2801 rate_idx = 0; /* TODO: HT rates */
2802 else
eb9fb5b8 2803 rate_idx = status->rate_idx;
8bf11d8d
JB		 2804 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2805 BIT(rate_idx));
0fb8ca45 2806 }
23a24def 2807 break;
05c914fe 2808 case NL80211_IFTYPE_MESH_POINT:
6032f934 2809 if (!multicast &&
47846c9b 2810 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2811 hdr->addr1) != 0) {
2812 if (!(sdata->dev->flags & IFF_PROMISC))
2813 return 0;
2814
554891e6 2815 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2816 }
2817 break;
05c914fe
JB		 2818 case NL80211_IFTYPE_AP_VLAN:
2819 case NL80211_IFTYPE_AP:
23a24def 2820 if (!bssid) {
47846c9b 2821 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2822 hdr->addr1))
2823 return 0;
2824 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2825 sdata->vif.addr)) {
3df6eaea
JB		 2826 /*
2827 * Accept public action frames even when the
2828 * BSSID doesn't match, this is used for P2P
2829 * and location updates. Note that mac80211
2830 * itself never looks at these frames.
2831 */
2832 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2833 ieee80211_is_public_action(hdr, skb->len))
2834 return 1;
771bbd09 2835 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
3df6eaea 2836 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2837 return 0;
554891e6 2838 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2839 }
23a24def 2840 break;
05c914fe 2841 case NL80211_IFTYPE_WDS:
a7767f95 2842 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2843 return 0;
2844 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2845 return 0;
2846 break;
2ca27bcf 2847 default:
fb1c1cd6
JB		 2848 /* should never get here */
2849 WARN_ON(1);
2850 break;
23a24def
JB		 2851 }
2852
2853 return 1;
2854}
2855
4406c376
JB		 2856/*
2857 * This function returns whether or not the SKB
2858 * was destined for RX processing or not, which,
2859 * if consume is true, is equivalent to whether
2860 * or not the skb was consumed.
2861 */
2862static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2863 struct sk_buff *skb, bool consume)
2864{
2865 struct ieee80211_local *local = rx->local;
2866 struct ieee80211_sub_if_data *sdata = rx->sdata;
2867 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2868 struct ieee80211_hdr *hdr = (void *)skb->data;
2869 int prepares;
2870
2871 rx->skb = skb;
554891e6 2872 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2873 prepares = prepare_for_handlers(rx, hdr);
2874
2875 if (!prepares)
2876 return false;
2877
4406c376
JB		 2878 if (!consume) {
2879 skb = skb_copy(skb, GFP_ATOMIC);
2880 if (!skb) {
2881 if (net_ratelimit())
2882 wiphy_debug(local->hw.wiphy,
b305dae4 2883 "failed to copy skb for %s\n",
4406c376
JB		 2884 sdata->name);
2885 return true;
2886 }
2887
2888 rx->skb = skb;
2889 }
2890
2891 ieee80211_invoke_rx_handlers(rx);
2892 return true;
2893}
2894
571ecf67 2895/*
6368e4b1
RR		 2896 * This is the actual Rx frames handler. as it blongs to Rx path it must
2897 * be called with rcu_read_lock protection.
571ecf67 2898 */
71ebb4aa 2899static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2900 struct sk_buff *skb)
571ecf67 2901{
554891e6 2902 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2903 struct ieee80211_local *local = hw_to_local(hw);
2904 struct ieee80211_sub_if_data *sdata;
571ecf67 2905 struct ieee80211_hdr *hdr;
e3cf8b3f 2906 __le16 fc;
5cf121c3 2907 struct ieee80211_rx_data rx;
4406c376 2908 struct ieee80211_sub_if_data *prev;
56af3268 2909 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2910 int err = 0;
571ecf67 2911
e3cf8b3f 2912 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2913 memset(&rx, 0, sizeof(rx));
2914 rx.skb = skb;
2915 rx.local = local;
72abd81b 2916
e3cf8b3f 2917 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2918 local->dot11ReceivedFragmentCount++;
571ecf67 2919
142b9f50 2920 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
8a690674 2921 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
b23b025f 2922 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2923 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2924
e3cf8b3f
ZY		 2925 if (ieee80211_is_mgmt(fc))
2926 err = skb_linearize(skb);
2927 else
2928 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2929
2930 if (err) {
2931 dev_kfree_skb(skb);
2932 return;
2933 }
2934
2935 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2936 ieee80211_parse_qos(&rx);
d1c3a37c 2937 ieee80211_verify_alignment(&rx);
38f3714d 2938
e3cf8b3f 2939 if (ieee80211_is_data(fc)) {
56af3268 2940 prev_sta = NULL;
4406c376 2941
7852e361 2942 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2943 if (!prev_sta) {
2944 prev_sta = sta;
2945 continue;
2946 }
2947
2948 rx.sta = prev_sta;
2949 rx.sdata = prev_sta->sdata;
4406c376 2950 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2951
56af3268 2952 prev_sta = sta;
4406c376 2953 }
56af3268
BG		 2954
2955 if (prev_sta) {
2956 rx.sta = prev_sta;
2957 rx.sdata = prev_sta->sdata;
2958
4406c376 2959 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2960 return;
8e26d5ad 2961 goto out;
56af3268 2962 }
4406c376
JB		 2963 }
2964
4b0dd98e 2965 prev = NULL;
b2e7771e 2966
4b0dd98e
JB		 2967 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2968 if (!ieee80211_sdata_running(sdata))
2969 continue;
340e11f3 2970
4b0dd98e
JB		 2971 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2972 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2973 continue;
340e11f3 2974
4b0dd98e
JB		 2975 /*
2976 * frame is destined for this interface, but if it's
2977 * not also for the previous one we handle that after
2978 * the loop to avoid copying the SKB once too much
2979 */
4bb29f8c 2980
4b0dd98e 2981 if (!prev) {
abe60632 2982 prev = sdata;
4b0dd98e 2983 continue;
340e11f3 2984 }
4bb29f8c 2985
7852e361 2986 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2987 rx.sdata = prev;
2988 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2989
4b0dd98e
JB		 2990 prev = sdata;
2991 }
2992
2993 if (prev) {
7852e361 2994 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2995 rx.sdata = prev;
4406c376 2996
4b0dd98e
JB		 2997 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2998 return;
571ecf67 2999 }
4406c376 3000
8e26d5ad 3001 out:
4406c376 3002 dev_kfree_skb(skb);
571ecf67 3003}
6368e4b1
RR		 3004
3005/*
3006 * This is the receive path handler. It is called by a low level driver when an
3007 * 802.11 MPDU is received from the hardware.
3008 */
103bf9f7 3009void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3010{
3011 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3012 struct ieee80211_rate *rate = NULL;
3013 struct ieee80211_supported_band *sband;
f1d58c25 3014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3015
d20ef63d
JB		 3016 WARN_ON_ONCE(softirq_count() == 0);
3017
77a980dc
JB		 3018 if (WARN_ON(status->band < 0 ||
3019 status->band >= IEEE80211_NUM_BANDS))
3020 goto drop;
8318d78a
JB		 3021
3022 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3023 if (WARN_ON(!sband))
3024 goto drop;
8318d78a 3025
89c3a8ac
JB		 3026 /*
3027 * If we're suspending, it is possible although not too likely
3028 * that we'd be receiving frames after having already partially
3029 * quiesced the stack. We can't process such frames then since
3030 * that might, for example, cause stations to be added or other
3031 * driver callbacks be invoked.
3032 */
77a980dc
JB		 3033 if (unlikely(local->quiescing || local->suspended))
3034 goto drop;
89c3a8ac 3035
ea77f12f
JB		 3036 /*
3037 * The same happens when we're not even started,
3038 * but that's worth a warning.
3039 */
77a980dc
JB		 3040 if (WARN_ON(!local->started))
3041 goto drop;
ea77f12f 3042
fc885189 3043 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3044 /*
fc885189
JB		 3045 * Validate the rate, unless a PLCP error means that
3046 * we probably can't have a valid rate here anyway.
e5d6eb83 3047 */
fc885189
JB		 3048
3049 if (status->flag & RX_FLAG_HT) {
3050 /*
3051 * rate_idx is MCS index, which can be [0-76]
3052 * as documented on:
3053 *
3054 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3055 *
3056 * Anything else would be some sort of driver or
3057 * hardware error. The driver should catch hardware
3058 * errors.
3059 */
3060 if (WARN((status->rate_idx < 0 ||
3061 status->rate_idx > 76),
3062 "Rate marked as an HT rate but passed "
3063 "status->rate_idx is not "
3064 "an MCS index [0-76]: %d (0x%02x)\n",
3065 status->rate_idx,
3066 status->rate_idx))
3067 goto drop;
3068 } else {
3069 if (WARN_ON(status->rate_idx < 0 ||
3070 status->rate_idx >= sband->n_bitrates))
3071 goto drop;
3072 rate = &sband->bitrates[status->rate_idx];
3073 }
0fb8ca45 3074 }
6368e4b1 3075
554891e6
JB		 3076 status->rx_flags = 0;
3077
6368e4b1
RR		 3078 /*
3079 * key references and virtual interfaces are protected using RCU
3080 * and this requires that we are in a read-side RCU section during
3081 * receive processing
3082 */
3083 rcu_read_lock();
3084
3085 /*
3086 * Frames with failed FCS/PLCP checksum are not returned,
3087 * all other frames are returned without radiotap header
3088 * if it was previously present.
3089 * Also, frames with less than 16 bytes are dropped.
3090 */
f1d58c25 3091 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3092 if (!skb) {
3093 rcu_read_unlock();
3094 return;
3095 }
3096
e1e54068
JB		 3097 ieee80211_tpt_led_trig_rx(local,
3098 ((struct ieee80211_hdr *)skb->data)->frame_control,
3099 skb->len);
071d9ac2 3100 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3101
3102 rcu_read_unlock();
77a980dc
JB		 3103
3104 return;
3105 drop:
3106 kfree_skb(skb);
6368e4b1 3107}
103bf9f7 3108EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3109
3110/* This is a version of the rx handler that can be called from hard irq
3111 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3112void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3113{
3114 struct ieee80211_local *local = hw_to_local(hw);
3115
3116 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3117
571ecf67
JB		 3118 skb->pkt_type = IEEE80211_RX_MSG;
3119 skb_queue_tail(&local->skb_queue, skb);
3120 tasklet_schedule(&local->tasklet);
3121}
3122EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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