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mac80211: make ieee80211_send_bar available for drivers
[mirror_ubuntu-bionic-kernel.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>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2 145 * MCS information is a separate field in radiotap,
73b48099
JB		 146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 148 */
149 *pos = 0;
8d6f658e 150 } else {
ebe6c7ba 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 152 *pos = rate->bitrate / 5;
8d6f658e 153 }
601ae7f2
BR		 154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 157 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
5f0b7de5
JB		 162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
9deb1ae5 165 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
601ae7f2 168 else
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
601ae7f2
BR		 171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
601ae7f2
BR		 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
601ae7f2
BR		 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 191 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 192 pos++;
aae89831 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
601ae7f2 196 pos += 2;
6d744bac
JB		 197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
601ae7f2
BR		 211}
212
b2e7771e
JB		 213/*
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 220 struct ieee80211_rate *rate)
b2e7771e 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 223 struct ieee80211_sub_if_data *sdata;
b2e7771e 224 int needed_headroom = 0;
b2e7771e
JB		 225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
b2e7771e
JB		 228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
0869aea0
JB		 237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
e3cf8b3f
ZY		 244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
b2e7771e 250 if (!local->monitors) {
0869aea0 251 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
0869aea0 256 return remove_monitor_info(local, origskb);
b2e7771e
JB		 257 }
258
0869aea0 259 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
0869aea0 283 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 284
285 if (!skb)
286 return origskb;
287 }
288
0869aea0
JB		 289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 291
ce3edf6d 292 skb_reset_mac_header(skb);
b2e7771e
JB		 293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
9607e6b6 304 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
5548a8a1 311 netif_receive_skb(skb2);
b2e7771e
JB		 312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
5548a8a1 322 netif_receive_skb(skb);
b2e7771e
JB		 323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
5cf121c3 330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 331{
238f74a2 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 334 int tid, seqno_idx, security_idx;
6e0d114d
JB		 335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 341 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 342 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 343
344 seqno_idx = tid;
345 security_idx = tid;
6e0d114d 346 } else {
1411f9b5
JB		 347 /*
348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 *
350 * Sequence numbers for management frames, QoS data
351 * frames with a broadcast/multicast address in the
352 * Address 1 field, and all non-QoS data frames sent
353 * by QoS STAs are assigned using an additional single
354 * modulo-4096 counter, [...]
355 *
356 * We also use that counter for non-QoS STAs.
357 */
9e26297a
JB		 358 seqno_idx = NUM_RX_DATA_QUEUES;
359 security_idx = 0;
360 if (ieee80211_is_mgmt(hdr->frame_control))
361 security_idx = NUM_RX_DATA_QUEUES;
362 tid = 0;
6e0d114d 363 }
52865dfd 364
9e26297a
JB		 365 rx->seqno_idx = seqno_idx;
366 rx->security_idx = security_idx;
6e0d114d
JB		 367 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368 * For now, set skb->priority to 0 for other cases. */
369 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 370}
6e0d114d 371
d1c3a37c
JB		 372/**
373 * DOC: Packet alignment
374 *
375 * Drivers always need to pass packets that are aligned to two-byte boundaries
376 * to the stack.
377 *
378 * Additionally, should, if possible, align the payload data in a way that
379 * guarantees that the contained IP header is aligned to a four-byte
380 * boundary. In the case of regular frames, this simply means aligning the
381 * payload to a four-byte boundary (because either the IP header is directly
382 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 383 * in front of it). If the payload data is not properly aligned and the
384 * architecture doesn't support efficient unaligned operations, mac80211
385 * will align the data.
d1c3a37c
JB		 386 *
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
392 *
25985edc 393 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
396 */
397static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 398{
59d9cb07
KV		 399#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400 WARN_ONCE((unsigned long)rx->skb->data & 1,
401 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 402#endif
6e0d114d
JB		 403}
404
6368e4b1 405
571ecf67
JB		 406/* rx handlers */
407
49461622 408static ieee80211_rx_result debug_noinline
5cf121c3 409ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 410{
411 struct ieee80211_local *local = rx->local;
554891e6 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 413 struct sk_buff *skb = rx->skb;
414
79f460ca
LC		 415 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
416 !local->sched_scanning))
4080c7cd
JB		 417 return RX_CONTINUE;
418
b23b025f 419 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 420 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
421 local->sched_scanning)
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
4080c7cd
JB		 424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426 return RX_DROP_UNUSABLE;
571ecf67
JB		 427}
428
3cfcf6ac
JM		 429
430static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431{
432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return 0;
436
437 return ieee80211_is_robust_mgmt_frame(hdr);
438}
439
440
441static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454{
455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456 struct ieee80211_mmie *mmie;
457
458 if (skb->len < 24 + sizeof(*mmie) ||
459 !is_multicast_ether_addr(hdr->da))
460 return -1;
461
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463 return -1; /* not a robust management frame */
464
465 mmie = (struct ieee80211_mmie *)
466 (skb->data + skb->len - sizeof(*mmie));
467 if (mmie->element_id != WLAN_EID_MMIE ||
468 mmie->length != sizeof(*mmie) - 2)
469 return -1;
470
471 return le16_to_cpu(mmie->key_id);
472}
473
474
33b64eb2 475static ieee80211_rx_result
5cf121c3 476ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 477{
a7767f95
HH		 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
479 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 480 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 481
a7767f95 482 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 483 if (is_multicast_ether_addr(hdr->addr1)) {
484 if (ieee80211_has_tods(hdr->frame_control) ||
485 !ieee80211_has_fromds(hdr->frame_control))
486 return RX_DROP_MONITOR;
487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
488 return RX_DROP_MONITOR;
489 } else {
490 if (!ieee80211_has_a4(hdr->frame_control))
491 return RX_DROP_MONITOR;
492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
493 return RX_DROP_MONITOR;
494 }
33b64eb2
LCC		 495 }
496
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
499 */
500
57cf8043 501 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 502 struct ieee80211_mgmt *mgmt;
d6d1a5a7 503
a7767f95 504 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 505 return RX_DROP_MONITOR;
506
a7767f95 507 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 508 u8 category;
33b64eb2 509 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 510 category = mgmt->u.action.category;
511 if (category != WLAN_CATEGORY_MESH_ACTION &&
512 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 513 return RX_DROP_MONITOR;
33b64eb2 514 return RX_CONTINUE;
33b64eb2
LCC		 515 }
516
a7767f95
HH		 517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 519 ieee80211_is_beacon(hdr->frame_control) ||
520 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 521 return RX_CONTINUE;
522
523 return RX_DROP_MONITOR;
524
525 }
526
527#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
528
529 if (ieee80211_is_data(hdr->frame_control) &&
530 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 531 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 532 return RX_DROP_MONITOR;
902acc78 533#undef msh_h_get
d6d1a5a7 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] &&
618 tid_agg_rx->stored_mpdu_num > 1) {
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;
2569a826 756 struct sta_info *sta = rx->sta;
1edfb1af
JB		 757 struct tid_ampdu_rx *tid_agg_rx;
758 u16 sc;
759 int tid;
760
761 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 762 goto dont_reorder;
1edfb1af
JB		 763
764 /*
765 * filter the QoS data rx stream according to
766 * STA/TID and check if this STA/TID is on aggregation
767 */
768
1edfb1af 769 if (!sta)
2569a826 770 goto dont_reorder;
1edfb1af
JB		 771
772 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
773
a87f736d
JB		 774 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
775 if (!tid_agg_rx)
776 goto dont_reorder;
1edfb1af
JB		 777
778 /* qos null data frames are excluded */
779 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 780 goto dont_reorder;
1edfb1af
JB		 781
782 /* new, potentially un-ordered, ampdu frame - process it */
783
784 /* reset session timer */
785 if (tid_agg_rx->timeout)
786 mod_timer(&tid_agg_rx->session_timer,
787 TU_TO_EXP_TIME(tid_agg_rx->timeout));
788
789 /* if this mpdu is fragmented - terminate rx aggregation session */
790 sc = le16_to_cpu(hdr->seq_ctrl);
791 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 792 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 793 skb_queue_tail(&rx->sdata->skb_queue, skb);
794 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 795 return;
1edfb1af
JB		 796 }
797
a87f736d
JB		 798 /*
799 * No locking needed -- we will only ever process one
800 * RX packet at a time, and thus own tid_agg_rx. All
801 * other code manipulating it needs to (and does) make
802 * sure that we cannot get to it any more before doing
803 * anything with it.
804 */
24a8fdad 805 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 806 return;
807
808 dont_reorder:
24a8fdad 809 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 810}
33b64eb2 811
49461622 812static ieee80211_rx_result debug_noinline
5cf121c3 813ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 814{
a7767f95 815 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 816 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 817
818 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
819 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 820 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 821 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 822 hdr->seq_ctrl)) {
554891e6 823 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 824 rx->local->dot11FrameDuplicateCount++;
825 rx->sta->num_duplicates++;
826 }
b1f93314 827 return RX_DROP_UNUSABLE;
571ecf67 828 } else
9e26297a 829 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 830 }
831
571ecf67
JB		 832 if (unlikely(rx->skb->len < 16)) {
833 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 834 return RX_DROP_MONITOR;
571ecf67
JB		 835 }
836
571ecf67
JB		 837 /* Drop disallowed frame classes based on STA auth/assoc state;
838 * IEEE 802.11, Chap 5.5.
839 *
ccd7b362
JB		 840 * mac80211 filters only based on association state, i.e. it drops
841 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 842 * deauth/disassoc frames when needed. In addition, hostapd is
843 * responsible for filtering on both auth and assoc states.
844 */
33b64eb2 845
902acc78 846 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 847 return ieee80211_rx_mesh_check(rx);
33b64eb2 848
a7767f95
HH		 849 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
850 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 851 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 852 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
2a33bee2
GE		 853 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
854 if (rx->sta && rx->sta->dummy &&
855 ieee80211_is_data_present(hdr->frame_control)) {
856 u16 ethertype;
857 u8 *payload;
858
859 payload = rx->skb->data +
860 ieee80211_hdrlen(hdr->frame_control);
861 ethertype = (payload[6] << 8) | payload[7];
862 if (cpu_to_be16(ethertype) ==
863 rx->sdata->control_port_protocol)
864 return RX_CONTINUE;
865 }
e4c26add 866 return RX_DROP_MONITOR;
2a33bee2 867 }
571ecf67 868
9ae54c84 869 return RX_CONTINUE;
570bd537
JB		 870}
871
872
49461622 873static ieee80211_rx_result debug_noinline
5cf121c3 874ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 875{
eb9fb5b8
JB		 876 struct sk_buff *skb = rx->skb;
877 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
878 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 879 int keyidx;
880 int hdrlen;
e4c26add 881 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 882 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 883 int mmie_keyidx = -1;
761ab470 884 __le16 fc;
570bd537 885
3017b80b
JB		 886 /*
887 * Key selection 101
888 *
3cfcf6ac 889 * There are four types of keys:
3017b80b 890 * - GTK (group keys)
3cfcf6ac 891 * - IGTK (group keys for management frames)
3017b80b
JB		 892 * - PTK (pairwise keys)
893 * - STK (station-to-station pairwise keys)
894 *
895 * When selecting a key, we have to distinguish between multicast
896 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 897 * use PTKs and STKs while the former always use GTKs and IGTKs.
898 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
899 * unicast frames can also use key indices like GTKs. Hence, if we
900 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 901 *
8dc06a1c
JB		 902 * Note that in a regular BSS, multicast frames are sent by the
903 * AP only, associated stations unicast the frame to the AP first
904 * which then multicasts it on their behalf.
905 *
3017b80b
JB		 906 * There is also a slight problem in IBSS mode: GTKs are negotiated
907 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 908 * The spec seems to expect that one negotiates the same key with
909 * every station but there's no such requirement; VLANs could be
910 * possible.
3017b80b
JB		 911 */
912
3017b80b 913 /*
1990af8d 914 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 915 * addressed to us nor a multicast frame.
916 */
554891e6 917 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 918 return RX_CONTINUE;
3017b80b 919
2569a826
JB		 920 /* start without a key */
921 rx->key = NULL;
922
d4e46a3d 923 if (rx->sta)
e31b8213 924 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 925
761ab470
JB		 926 fc = hdr->frame_control;
927
928 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 929 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
930
e31b8213
JB		 931 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
932 rx->key = sta_ptk;
dc1580dd
JB		 933 if ((status->flag & RX_FLAG_DECRYPTED) &&
934 (status->flag & RX_FLAG_IV_STRIPPED))
935 return RX_CONTINUE;
0c7c10c7 936 /* Skip decryption if the frame is not protected. */
761ab470 937 if (!ieee80211_has_protected(fc))
0c7c10c7 938 return RX_CONTINUE;
3cfcf6ac
JM		 939 } else if (mmie_keyidx >= 0) {
940 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 941 if ((status->flag & RX_FLAG_DECRYPTED) &&
942 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 943 return RX_CONTINUE;
944
945 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
946 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
947 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 948 if (rx->sta)
949 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
950 if (!rx->key)
951 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 952 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 953 /*
954 * The frame was not protected, so skip decryption. However, we
955 * need to set rx->key if there is a key that could have been
956 * used so that the frame may be dropped if encryption would
957 * have been expected.
958 */
959 struct ieee80211_key *key = NULL;
897bed8b
JB		 960 struct ieee80211_sub_if_data *sdata = rx->sdata;
961 int i;
962
761ab470 963 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 964 is_multicast_ether_addr(hdr->addr1) &&
965 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
966 rx->key = key;
897bed8b
JB		 967 else {
968 if (rx->sta) {
969 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
970 key = rcu_dereference(rx->sta->gtk[i]);
971 if (key)
972 break;
973 }
974 }
975 if (!key) {
976 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
977 key = rcu_dereference(sdata->keys[i]);
978 if (key)
979 break;
980 }
981 }
982 if (key)
983 rx->key = key;
984 }
0c7c10c7 985 return RX_CONTINUE;
571ecf67 986 } else {
39184b15 987 u8 keyid;
3017b80b
JB		 988 /*
989 * The device doesn't give us the IV so we won't be
990 * able to look up the key. That's ok though, we
991 * don't need to decrypt the frame, we just won't
992 * be able to keep statistics accurate.
993 * Except for key threshold notifications, should
994 * we somehow allow the driver to tell us which key
995 * the hardware used if this flag is set?
996 */
eb9fb5b8
JB		 997 if ((status->flag & RX_FLAG_DECRYPTED) &&
998 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 999 return RX_CONTINUE;
3017b80b 1000
761ab470 1001 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1002
1003 if (rx->skb->len < 8 + hdrlen)
e4c26add 1004 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1005
1006 /*
1007 * no need to call ieee80211_wep_get_keyidx,
1008 * it verifies a bunch of things we've done already
1009 */
39184b15
ZY		 1010 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1011 keyidx = keyid >> 6;
3017b80b 1012
e31b8213
JB		 1013 /* check per-station GTK first, if multicast packet */
1014 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1015 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1016
e31b8213
JB		 1017 /* if not found, try default key */
1018 if (!rx->key) {
1019 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1020
1021 /*
1022 * RSNA-protected unicast frames should always be
1023 * sent with pairwise or station-to-station keys,
1024 * but for WEP we allow using a key index as well.
1025 */
1026 if (rx->key &&
1027 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1028 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1029 !is_multicast_ether_addr(hdr->addr1))
1030 rx->key = NULL;
1031 }
571ecf67
JB		 1032 }
1033
3017b80b 1034 if (rx->key) {
95acac61
JB		 1035 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1036 return RX_DROP_MONITOR;
1037
571ecf67 1038 rx->key->tx_rx_count++;
011bfcc4 1039 /* TODO: add threshold stuff again */
1990af8d 1040 } else {
e4c26add 1041 return RX_DROP_MONITOR;
70f08765
JB		 1042 }
1043
39184b15
ZY		 1044 if (skb_linearize(rx->skb))
1045 return RX_DROP_UNUSABLE;
761ab470 1046 /* the hdr variable is invalid now! */
1990af8d 1047
97359d12
JB		 1048 switch (rx->key->conf.cipher) {
1049 case WLAN_CIPHER_SUITE_WEP40:
1050 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1051 /* Check for weak IVs if possible */
1052 if (rx->sta && ieee80211_is_data(fc) &&
1053 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1054 !(status->flag & RX_FLAG_DECRYPTED)) &&
1055 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1056 rx->sta->wep_weak_iv_count++;
1057
e2f036da
MN		 1058 result = ieee80211_crypto_wep_decrypt(rx);
1059 break;
97359d12 1060 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1061 result = ieee80211_crypto_tkip_decrypt(rx);
1062 break;
97359d12 1063 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1064 result = ieee80211_crypto_ccmp_decrypt(rx);
1065 break;
97359d12 1066 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1067 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1068 break;
3ffc2a90
JB		 1069 default:
1070 /*
1071 * We can reach here only with HW-only algorithms
1072 * but why didn't it decrypt the frame?!
1073 */
1074 return RX_DROP_UNUSABLE;
70f08765
JB		 1075 }
1076
e2f036da 1077 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1078 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1079
1080 return result;
70f08765
JB		 1081}
1082
572e0012
KV		 1083static ieee80211_rx_result debug_noinline
1084ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1085{
1086 struct ieee80211_local *local;
1087 struct ieee80211_hdr *hdr;
1088 struct sk_buff *skb;
1089
1090 local = rx->local;
1091 skb = rx->skb;
1092 hdr = (struct ieee80211_hdr *) skb->data;
1093
1094 if (!local->pspolling)
1095 return RX_CONTINUE;
1096
1097 if (!ieee80211_has_fromds(hdr->frame_control))
1098 /* this is not from AP */
1099 return RX_CONTINUE;
1100
1101 if (!ieee80211_is_data(hdr->frame_control))
1102 return RX_CONTINUE;
1103
1104 if (!ieee80211_has_moredata(hdr->frame_control)) {
1105 /* AP has no more frames buffered for us */
1106 local->pspolling = false;
1107 return RX_CONTINUE;
1108 }
1109
1110 /* more data bit is set, let's request a new frame from the AP */
1111 ieee80211_send_pspoll(local, rx->sdata);
1112
1113 return RX_CONTINUE;
1114}
1115
133b8226 1116static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1117{
133b8226 1118 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1119 struct ieee80211_local *local = sdata->local;
0795af57 1120
3e122be0 1121 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1122 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1123 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1124 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1125#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1126 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1127 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1128#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1129}
1130
ff9458d3 1131static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1132{
133b8226 1133 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1134
3e122be0 1135 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1136
571ecf67 1137#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1138 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1139 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1140#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1141
af818581 1142 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1143#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1144 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1145 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1146#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1147 return;
1148 }
1149
1150 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1151}
1152
d057e5a3
AN		 1153int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1154{
1155 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1156 bool in_ps;
1157
1158 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1159
1160 /* Don't let the same PS state be set twice */
1161 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1162 if ((start && in_ps) || (!start && !in_ps))
1163 return -EINVAL;
1164
1165 if (start)
1166 ap_sta_ps_start(sta_inf);
1167 else
1168 ap_sta_ps_end(sta_inf);
1169
1170 return 0;
1171}
1172EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1173
49461622 1174static ieee80211_rx_result debug_noinline
5cf121c3 1175ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1176{
1177 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1178 struct sk_buff *skb = rx->skb;
1179 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1180 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1181
1182 if (!sta)
9ae54c84 1183 return RX_CONTINUE;
571ecf67 1184
b291ba11
JB		 1185 /*
1186 * Update last_rx only for IBSS packets which are for the current
1187 * BSSID to avoid keeping the current IBSS network alive in cases
1188 * where other STAs start using different BSSID.
1189 */
05c914fe 1190 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1191 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1192 NL80211_IFTYPE_ADHOC);
3af6334c 1193 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1194 sta->last_rx = jiffies;
3af6334c
FF		 1195 if (ieee80211_is_data(hdr->frame_control)) {
1196 sta->last_rx_rate_idx = status->rate_idx;
1197 sta->last_rx_rate_flag = status->flag;
1198 }
1199 }
b291ba11
JB		 1200 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1201 /*
33b64eb2
LCC		 1202 * Mesh beacons will update last_rx when if they are found to
1203 * match the current local configuration when processed.
571ecf67 1204 */
b291ba11 1205 sta->last_rx = jiffies;
3af6334c
FF		 1206 if (ieee80211_is_data(hdr->frame_control)) {
1207 sta->last_rx_rate_idx = status->rate_idx;
1208 sta->last_rx_rate_flag = status->flag;
1209 }
571ecf67
JB		 1210 }
1211
554891e6 1212 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1213 return RX_CONTINUE;
571ecf67 1214
3cf335d5
KV		 1215 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1216 ieee80211_sta_rx_notify(rx->sdata, hdr);
1217
571ecf67
JB		 1218 sta->rx_fragments++;
1219 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1220 sta->last_signal = status->signal;
541a45a1 1221 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1222
72eaa43a
JB		 1223 /*
1224 * Change STA power saving mode only at the end of a frame
1225 * exchange sequence.
1226 */
d057e5a3
AN		 1227 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1228 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1229 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1230 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1231 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1232 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1233 /*
1234 * Ignore doze->wake transitions that are
1235 * indicated by non-data frames, the standard
1236 * is unclear here, but for example going to
1237 * PS mode and then scanning would cause a
1238 * doze->wake transition for the probe request,
1239 * and that is clearly undesirable.
1240 */
1241 if (ieee80211_is_data(hdr->frame_control) &&
1242 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1243 ap_sta_ps_end(sta);
72eaa43a
JB		 1244 } else {
1245 if (ieee80211_has_pm(hdr->frame_control))
1246 ap_sta_ps_start(sta);
1247 }
571ecf67
JB		 1248 }
1249
22403def
JB		 1250 /*
1251 * Drop (qos-)data::nullfunc frames silently, since they
1252 * are used only to control station power saving mode.
1253 */
1254 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1255 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1256 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1257
1258 /*
1259 * If we receive a 4-addr nullfunc frame from a STA
1260 * that was not moved to a 4-addr STA vlan yet, drop
1261 * the frame to the monitor interface, to make sure
1262 * that hostapd sees it
1263 */
1264 if (ieee80211_has_a4(hdr->frame_control) &&
1265 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1266 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1267 !rx->sdata->u.vlan.sta)))
1268 return RX_DROP_MONITOR;
22403def
JB		 1269 /*
1270 * Update counter and free packet here to avoid
1271 * counting this as a dropped packed.
1272 */
571ecf67
JB		 1273 sta->rx_packets++;
1274 dev_kfree_skb(rx->skb);
9ae54c84 1275 return RX_QUEUED;
571ecf67
JB		 1276 }
1277
9ae54c84 1278 return RX_CONTINUE;
571ecf67
JB		 1279} /* ieee80211_rx_h_sta_process */
1280
571ecf67
JB		 1281static inline struct ieee80211_fragment_entry *
1282ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1283 unsigned int frag, unsigned int seq, int rx_queue,
1284 struct sk_buff **skb)
1285{
1286 struct ieee80211_fragment_entry *entry;
1287 int idx;
1288
1289 idx = sdata->fragment_next;
1290 entry = &sdata->fragments[sdata->fragment_next++];
1291 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1292 sdata->fragment_next = 0;
1293
1294 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1295#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1296 struct ieee80211_hdr *hdr =
1297 (struct ieee80211_hdr *) entry->skb_list.next->data;
1298 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1299 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1300 "addr1=%pM addr2=%pM\n",
47846c9b 1301 sdata->name, idx,
571ecf67 1302 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1303 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1304#endif
571ecf67
JB		 1305 __skb_queue_purge(&entry->skb_list);
1306 }
1307
1308 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1309 *skb = NULL;
1310 entry->first_frag_time = jiffies;
1311 entry->seq = seq;
1312 entry->rx_queue = rx_queue;
1313 entry->last_frag = frag;
1314 entry->ccmp = 0;
1315 entry->extra_len = 0;
1316
1317 return entry;
1318}
1319
1320static inline struct ieee80211_fragment_entry *
1321ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1322 unsigned int frag, unsigned int seq,
571ecf67
JB		 1323 int rx_queue, struct ieee80211_hdr *hdr)
1324{
1325 struct ieee80211_fragment_entry *entry;
1326 int i, idx;
1327
1328 idx = sdata->fragment_next;
1329 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1330 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1331
1332 idx--;
1333 if (idx < 0)
1334 idx = IEEE80211_FRAGMENT_MAX - 1;
1335
1336 entry = &sdata->fragments[idx];
1337 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1338 entry->rx_queue != rx_queue ||
1339 entry->last_frag + 1 != frag)
1340 continue;
1341
b73d70ad 1342 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1343
b73d70ad
HH		 1344 /*
1345 * Check ftype and addresses are equal, else check next fragment
1346 */
1347 if (((hdr->frame_control ^ f_hdr->frame_control) &
1348 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1349 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1350 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1351 continue;
1352
ab46623e 1353 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1354 __skb_queue_purge(&entry->skb_list);
1355 continue;
1356 }
1357 return entry;
1358 }
1359
1360 return NULL;
1361}
1362
49461622 1363static ieee80211_rx_result debug_noinline
5cf121c3 1364ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1365{
1366 struct ieee80211_hdr *hdr;
1367 u16 sc;
358c8d9d 1368 __le16 fc;
571ecf67
JB		 1369 unsigned int frag, seq;
1370 struct ieee80211_fragment_entry *entry;
1371 struct sk_buff *skb;
554891e6 1372 struct ieee80211_rx_status *status;
571ecf67 1373
b73d70ad 1374 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1375 fc = hdr->frame_control;
571ecf67
JB		 1376 sc = le16_to_cpu(hdr->seq_ctrl);
1377 frag = sc & IEEE80211_SCTL_FRAG;
1378
358c8d9d 1379 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1380 (rx->skb)->len < 24 ||
1381 is_multicast_ether_addr(hdr->addr1))) {
1382 /* not fragmented */
1383 goto out;
1384 }
1385 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1386
e3cf8b3f
ZY		 1387 if (skb_linearize(rx->skb))
1388 return RX_DROP_UNUSABLE;
1389
058897a4
AK		 1390 /*
1391 * skb_linearize() might change the skb->data and
1392 * previously cached variables (in this case, hdr) need to
1393 * be refreshed with the new data.
1394 */
1395 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1396 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1397
1398 if (frag == 0) {
1399 /* This is the first fragment of a new frame. */
1400 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1401 rx->seqno_idx, &(rx->skb));
97359d12 1402 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1403 ieee80211_has_protected(fc)) {
9e26297a 1404 int queue = rx->security_idx;
571ecf67
JB		 1405 /* Store CCMP PN so that we can verify that the next
1406 * fragment has a sequential PN value. */
1407 entry->ccmp = 1;
1408 memcpy(entry->last_pn,
9190252c 1409 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1410 CCMP_PN_LEN);
1411 }
9ae54c84 1412 return RX_QUEUED;
571ecf67
JB		 1413 }
1414
1415 /* This is a fragment for a frame that should already be pending in
1416 * fragment cache. Add this fragment to the end of the pending entry.
1417 */
9e26297a
JB		 1418 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1419 rx->seqno_idx, hdr);
571ecf67
JB		 1420 if (!entry) {
1421 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1422 return RX_DROP_MONITOR;
571ecf67
JB		 1423 }
1424
1425 /* Verify that MPDUs within one MSDU have sequential PN values.
1426 * (IEEE 802.11i, 8.3.3.4.5) */
1427 if (entry->ccmp) {
1428 int i;
1429 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1430 int queue;
97359d12 1431 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1432 return RX_DROP_UNUSABLE;
571ecf67
JB		 1433 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1434 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1435 pn[i]++;
1436 if (pn[i])
1437 break;
1438 }
9e26297a 1439 queue = rx->security_idx;
9190252c 1440 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1441 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1442 return RX_DROP_UNUSABLE;
571ecf67
JB		 1443 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1444 }
1445
358c8d9d 1446 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1447 __skb_queue_tail(&entry->skb_list, rx->skb);
1448 entry->last_frag = frag;
1449 entry->extra_len += rx->skb->len;
358c8d9d 1450 if (ieee80211_has_morefrags(fc)) {
571ecf67 1451 rx->skb = NULL;
9ae54c84 1452 return RX_QUEUED;
571ecf67
JB		 1453 }
1454
1455 rx->skb = __skb_dequeue(&entry->skb_list);
1456 if (skb_tailroom(rx->skb) < entry->extra_len) {
1457 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1458 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1459 GFP_ATOMIC))) {
1460 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1461 __skb_queue_purge(&entry->skb_list);
e4c26add 1462 return RX_DROP_UNUSABLE;
571ecf67
JB		 1463 }
1464 }
1465 while ((skb = __skb_dequeue(&entry->skb_list))) {
1466 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1467 dev_kfree_skb(skb);
1468 }
1469
1470 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1471 status = IEEE80211_SKB_RXCB(rx->skb);
1472 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1473
1474 out:
1475 if (rx->sta)
1476 rx->sta->rx_packets++;
1477 if (is_multicast_ether_addr(hdr->addr1))
1478 rx->local->dot11MulticastReceivedFrameCount++;
1479 else
1480 ieee80211_led_rx(rx->local);
9ae54c84 1481 return RX_CONTINUE;
571ecf67
JB		 1482}
1483
49461622 1484static ieee80211_rx_result debug_noinline
5cf121c3 1485ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1486{
af818581 1487 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1488 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1489 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1490
358c8d9d 1491 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1492 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1493 return RX_CONTINUE;
571ecf67 1494
05c914fe
JB		 1495 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1496 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1497 return RX_DROP_UNUSABLE;
98f0b0a3 1498
af818581
JB		 1499 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1500 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1501 else
1502 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1503
9ae54c84 1504 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1505 * count as an dropped frame. */
1506 dev_kfree_skb(rx->skb);
1507
9ae54c84 1508 return RX_QUEUED;
571ecf67
JB		 1509}
1510
49461622 1511static ieee80211_rx_result debug_noinline
5cf121c3 1512ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1513{
6e0d114d 1514 u8 *data = rx->skb->data;
238f74a2 1515 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1516
238f74a2 1517 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1518 return RX_CONTINUE;
6e0d114d
JB		 1519
1520 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1521 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1522 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1523 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1524 /* change frame type to non QOS */
238f74a2 1525 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1526
9ae54c84 1527 return RX_CONTINUE;
6e0d114d
JB		 1528}
1529
76ee65bf 1530static int
5cf121c3 1531ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1532{
07346f81 1533 if (unlikely(!rx->sta ||
f4ea83dd 1534 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1535 return -EACCES;
571ecf67 1536
76ee65bf 1537 return 0;
571ecf67
JB		 1538}
1539
76ee65bf 1540static int
358c8d9d 1541ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1542{
eb9fb5b8
JB		 1543 struct sk_buff *skb = rx->skb;
1544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1545
3017b80b 1546 /*
7848ba7d
JB		 1547 * Pass through unencrypted frames if the hardware has
1548 * decrypted them already.
3017b80b 1549 */
eb9fb5b8 1550 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1551 return 0;
571ecf67
JB		 1552
1553 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1554 if (unlikely(!ieee80211_has_protected(fc) &&
1555 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1556 ieee80211_is_data(fc) &&
b3fc9c6c 1557 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1558 return -EACCES;
bef5d1c7
JB		 1559
1560 return 0;
1561}
1562
1563static int
1564ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1565{
1566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1567 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1568 __le16 fc = hdr->frame_control;
bef5d1c7 1569
e3efca0a
JM		 1570 /*
1571 * Pass through unencrypted frames if the hardware has
1572 * decrypted them already.
1573 */
1574 if (status->flag & RX_FLAG_DECRYPTED)
1575 return 0;
bef5d1c7 1576
f2ca3ea4 1577 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1578 if (unlikely(!ieee80211_has_protected(fc) &&
1579 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1580 rx->key)) {
1581 if (ieee80211_is_deauth(fc))
1582 cfg80211_send_unprot_deauth(rx->sdata->dev,
1583 rx->skb->data,
1584 rx->skb->len);
1585 else if (ieee80211_is_disassoc(fc))
1586 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1587 rx->skb->data,
1588 rx->skb->len);
f2ca3ea4 1589 return -EACCES;
cf4e594e 1590 }
f2ca3ea4 1591 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1592 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1593 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1594 if (ieee80211_is_deauth(fc))
1595 cfg80211_send_unprot_deauth(rx->sdata->dev,
1596 rx->skb->data,
1597 rx->skb->len);
1598 else if (ieee80211_is_disassoc(fc))
1599 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1600 rx->skb->data,
1601 rx->skb->len);
f2ca3ea4 1602 return -EACCES;
cf4e594e 1603 }
f2ca3ea4
JM		 1604 /*
1605 * When using MFP, Action frames are not allowed prior to
1606 * having configured keys.
1607 */
1608 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1609 ieee80211_is_robust_mgmt_frame(
1610 (struct ieee80211_hdr *) rx->skb->data)))
1611 return -EACCES;
1612 }
b3fc9c6c 1613
76ee65bf 1614 return 0;
571ecf67
JB		 1615}
1616
76ee65bf 1617static int
4114fa21 1618__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1619{
eb9fb5b8 1620 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1621 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1622 bool check_port_control = false;
1623 struct ethhdr *ehdr;
1624 int ret;
f14543ee 1625
4114fa21 1626 *port_control = false;
9bc383de
JB		 1627 if (ieee80211_has_a4(hdr->frame_control) &&
1628 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1629 return -1;
9bc383de 1630
fbb327c5
FF		 1631 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1632 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1633
1634 if (!sdata->u.mgd.use_4addr)
1635 return -1;
1636 else
1637 check_port_control = true;
1638 }
1639
9bc383de 1640 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1641 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1642 return -1;
571ecf67 1643
fbb327c5 1644 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1645 if (ret < 0)
fbb327c5
FF		 1646 return ret;
1647
1648 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1649 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1650 *port_control = true;
1651 else if (check_port_control)
fbb327c5
FF		 1652 return -1;
1653
1654 return 0;
76ee65bf 1655}
571ecf67 1656
ce3edf6d
JB		 1657/*
1658 * requires that rx->skb is a frame with ethernet header
1659 */
358c8d9d 1660static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1661{
c97c23e3 1662 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1663 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1664 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1665
1666 /*
1667 * Allow EAPOL frames to us/the PAE group address regardless
1668 * of whether the frame was encrypted or not.
1669 */
a621fa4d 1670 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1671 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1672 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1673 return true;
1674
1675 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1676 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1677 return false;
1678
1679 return true;
1680}
1681
1682/*
1683 * requires that rx->skb is a frame with ethernet header
1684 */
76ee65bf 1685static void
5cf121c3 1686ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1687{
eb9fb5b8
JB		 1688 struct ieee80211_sub_if_data *sdata = rx->sdata;
1689 struct net_device *dev = sdata->dev;
76ee65bf 1690 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1691 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1692 struct sta_info *dsta;
554891e6 1693 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1694
76ee65bf
RR		 1695 skb = rx->skb;
1696 xmit_skb = NULL;
571ecf67 1697
05c914fe
JB		 1698 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1699 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1700 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1701 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1702 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1703 if (is_multicast_ether_addr(ehdr->h_dest)) {
1704 /*
1705 * send multicast frames both to higher layers in
1706 * local net stack and back to the wireless medium
1707 */
76ee65bf
RR		 1708 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1709 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1710 printk(KERN_DEBUG "%s: failed to clone "
1711 "multicast frame\n", dev->name);
1712 } else {
abe60632
JB		 1713 dsta = sta_info_get(sdata, skb->data);
1714 if (dsta) {
ce3edf6d
JB		 1715 /*
1716 * The destination station is associated to
1717 * this AP (in this VLAN), so send the frame
1718 * directly to it and do not pass it to local
1719 * net stack.
571ecf67 1720 */
76ee65bf 1721 xmit_skb = skb;
571ecf67
JB		 1722 skb = NULL;
1723 }
571ecf67
JB		 1724 }
1725 }
1726
1727 if (skb) {
d1c3a37c
JB		 1728 int align __maybe_unused;
1729
59d9cb07 1730#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1731 /*
1732 * 'align' will only take the values 0 or 2 here
1733 * since all frames are required to be aligned
1734 * to 2-byte boundaries when being passed to
1735 * mac80211. That also explains the __skb_push()
1736 * below.
1737 */
dacb6f1d 1738 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1739 if (align) {
1740 if (WARN_ON(skb_headroom(skb) < 3)) {
1741 dev_kfree_skb(skb);
1742 skb = NULL;
1743 } else {
1744 u8 *data = skb->data;
8ce0b589
ZY		 1745 size_t len = skb_headlen(skb);
1746 skb->data -= align;
1747 memmove(skb->data, data, len);
1748 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1749 }
1750 }
1751#endif
1752
1753 if (skb) {
1754 /* deliver to local stack */
1755 skb->protocol = eth_type_trans(skb, dev);
1756 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1757 netif_receive_skb(skb);
d1c3a37c 1758 }
571ecf67
JB		 1759 }
1760
76ee65bf 1761 if (xmit_skb) {
571ecf67 1762 /* send to wireless media */
f831e909 1763 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1764 skb_reset_network_header(xmit_skb);
1765 skb_reset_mac_header(xmit_skb);
76ee65bf 1766 dev_queue_xmit(xmit_skb);
571ecf67 1767 }
76ee65bf
RR		 1768}
1769
49461622 1770static ieee80211_rx_result debug_noinline
5cf121c3 1771ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1772{
eb9fb5b8 1773 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1774 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1775 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1776 __le16 fc = hdr->frame_control;
eaf85ca7 1777 struct sk_buff_head frame_list;
554891e6 1778 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1779
358c8d9d 1780 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1781 return RX_CONTINUE;
fd4c7f2f 1782
358c8d9d 1783 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1784 return RX_DROP_MONITOR;
fd4c7f2f 1785
554891e6 1786 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1787 return RX_CONTINUE;
fd4c7f2f 1788
eaf85ca7
ZY		 1789 if (ieee80211_has_a4(hdr->frame_control) &&
1790 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1791 !rx->sdata->u.vlan.sta)
e4c26add 1792 return RX_DROP_UNUSABLE;
fd4c7f2f 1793
eaf85ca7
ZY		 1794 if (is_multicast_ether_addr(hdr->addr1) &&
1795 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1796 rx->sdata->u.vlan.sta) ||
1797 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1798 rx->sdata->u.mgd.use_4addr)))
e4c26add 1799 return RX_DROP_UNUSABLE;
fd4c7f2f 1800
eaf85ca7
ZY		 1801 skb->dev = dev;
1802 __skb_queue_head_init(&frame_list);
fd4c7f2f 1803
e3cf8b3f
ZY		 1804 if (skb_linearize(skb))
1805 return RX_DROP_UNUSABLE;
1806
eaf85ca7
ZY		 1807 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1808 rx->sdata->vif.type,
8b3becad 1809 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1810
eaf85ca7
ZY		 1811 while (!skb_queue_empty(&frame_list)) {
1812 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1813
358c8d9d 1814 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1815 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1816 continue;
1817 }
eaf85ca7
ZY		 1818 dev->stats.rx_packets++;
1819 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1820
1821 ieee80211_deliver_skb(rx);
1822 }
1823
9ae54c84 1824 return RX_QUEUED;
fd4c7f2f
RR		 1825}
1826
bf94e17b 1827#ifdef CONFIG_MAC80211_MESH
b0dee578 1828static ieee80211_rx_result
e32f85f7
LCC		 1829ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1830{
1831 struct ieee80211_hdr *hdr;
1832 struct ieee80211s_hdr *mesh_hdr;
1833 unsigned int hdrlen;
1834 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1835 struct ieee80211_local *local = rx->local;
eb9fb5b8 1836 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1837 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1838
1839 hdr = (struct ieee80211_hdr *) skb->data;
1840 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1841 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1842
1843 if (!ieee80211_is_data(hdr->frame_control))
1844 return RX_CONTINUE;
1845
1846 if (!mesh_hdr->ttl)
1847 /* illegal frame */
1848 return RX_DROP_MONITOR;
1849
43b7b314 1850 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1851 struct mesh_path *mppath;
43b7b314
JC		 1852 char *proxied_addr;
1853 char *mpp_addr;
1854
1855 if (is_multicast_ether_addr(hdr->addr1)) {
1856 mpp_addr = hdr->addr3;
1857 proxied_addr = mesh_hdr->eaddr1;
1858 } else {
1859 mpp_addr = hdr->addr4;
1860 proxied_addr = mesh_hdr->eaddr2;
1861 }
79617dee 1862
79617dee 1863 rcu_read_lock();
43b7b314 1864 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1865 if (!mppath) {
43b7b314 1866 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1867 } else {
1868 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1869 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1870 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1871 spin_unlock_bh(&mppath->state_lock);
1872 }
1873 rcu_read_unlock();
1874 }
1875
3c5772a5
JC		 1876 /* Frame has reached destination. Don't forward */
1877 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1878 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1879 return RX_CONTINUE;
1880
1881 mesh_hdr->ttl--;
1882
554891e6 1883 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1884 if (!mesh_hdr->ttl)
472dbc45 1885 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1886 dropped_frames_ttl);
1887 else {
1888 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1889 struct ieee80211_tx_info *info;
1890
e32f85f7
LCC		 1891 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1892
1893 if (!fwd_skb && net_ratelimit())
1894 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1895 sdata->name);
919bbad5 1896 if (!fwd_skb)
b51aff05 1897 goto out;
e32f85f7
LCC		 1898
1899 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1900 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1901 info = IEEE80211_SKB_CB(fwd_skb);
1902 memset(info, 0, sizeof(*info));
1903 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1904 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1905 skb_set_queue_mapping(skb,
1906 ieee80211_select_queue(rx->sdata, fwd_skb));
1907 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1908 if (is_multicast_ether_addr(fwd_hdr->addr1))
1909 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1910 fwded_mcast);
1911 else {
3c5772a5
JC		 1912 int err;
1913 /*
1914 * Save TA to addr1 to send TA a path error if a
1915 * suitable next hop is not found
1916 */
1917 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1918 ETH_ALEN);
3c5772a5 1919 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1920 /* Failed to immediately resolve next hop:
1921 * fwded frame was dropped or will be added
1922 * later to the pending skb queue. */
1923 if (err)
1924 return RX_DROP_MONITOR;
c8a61a7d
DW		 1925
1926 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1927 fwded_unicast);
249b405c
JC		 1928 }
1929 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1930 fwded_frames);
3b8d81e0 1931 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1932 }
1933 }
1934
b51aff05 1935 out:
3c5772a5 1936 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1937 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1938 return RX_CONTINUE;
1939 else
1940 return RX_DROP_MONITOR;
1941}
bf94e17b 1942#endif
e32f85f7 1943
49461622 1944static ieee80211_rx_result debug_noinline
5cf121c3 1945ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1946{
eb9fb5b8 1947 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1948 struct ieee80211_local *local = rx->local;
eb9fb5b8 1949 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1950 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1951 __le16 fc = hdr->frame_control;
4114fa21 1952 bool port_control;
ce3edf6d 1953 int err;
76ee65bf 1954
358c8d9d 1955 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1956 return RX_CONTINUE;
76ee65bf 1957
358c8d9d 1958 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1959 return RX_DROP_MONITOR;
76ee65bf 1960
f14543ee
FF		 1961 /*
1962 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1963 * that a 4-addr station can be detected and moved into a separate VLAN
1964 */
1965 if (ieee80211_has_a4(hdr->frame_control) &&
1966 sdata->vif.type == NL80211_IFTYPE_AP)
1967 return RX_DROP_MONITOR;
1968
4114fa21 1969 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1970 if (unlikely(err))
e4c26add 1971 return RX_DROP_UNUSABLE;
76ee65bf 1972
358c8d9d 1973 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1974 return RX_DROP_MONITOR;
ce3edf6d 1975
4114fa21
FF		 1976 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1977 unlikely(port_control) && sdata->bss) {
1978 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1979 u.ap);
1980 dev = sdata->dev;
1981 rx->sdata = sdata;
1982 }
1983
76ee65bf
RR		 1984 rx->skb->dev = dev;
1985
1986 dev->stats.rx_packets++;
1987 dev->stats.rx_bytes += rx->skb->len;
1988
08ca944e 1989 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1990 !is_multicast_ether_addr(
1991 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1992 (!local->scanning &&
1993 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1994 mod_timer(&local->dynamic_ps_timer, jiffies +
1995 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1996 }
1997
76ee65bf 1998 ieee80211_deliver_skb(rx);
571ecf67 1999
9ae54c84 2000 return RX_QUEUED;
571ecf67
JB		 2001}
2002
49461622 2003static ieee80211_rx_result debug_noinline
24a8fdad 2004ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2005{
2006 struct ieee80211_local *local = rx->local;
2007 struct ieee80211_hw *hw = &local->hw;
2008 struct sk_buff *skb = rx->skb;
a7767f95 2009 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2010 struct tid_ampdu_rx *tid_agg_rx;
2011 u16 start_seq_num;
2012 u16 tid;
2013
a7767f95 2014 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2015 return RX_CONTINUE;
71364716 2016
a7767f95 2017 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2018 struct {
2019 __le16 control, start_seq_num;
2020 } __packed bar_data;
2021
71364716 2022 if (!rx->sta)
a02ae758 2023 return RX_DROP_MONITOR;
8ae5977f
JB		 2024
2025 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2026 &bar_data, sizeof(bar_data)))
2027 return RX_DROP_MONITOR;
2028
8ae5977f 2029 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2030
2031 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2032 if (!tid_agg_rx)
a02ae758 2033 return RX_DROP_MONITOR;
71364716 2034
8ae5977f 2035 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2036
2037 /* reset session timer */
20ad19d0
JB		 2038 if (tid_agg_rx->timeout)
2039 mod_timer(&tid_agg_rx->session_timer,
2040 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2041
dd318575 2042 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2043 /* release stored frames up to start of BAR */
24a8fdad 2044 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2045 spin_unlock(&tid_agg_rx->reorder_lock);
2046
a02ae758
JB		 2047 kfree_skb(skb);
2048 return RX_QUEUED;
71364716
RR		 2049 }
2050
08daecae
JB		 2051 /*
2052 * After this point, we only want management frames,
2053 * so we can drop all remaining control frames to
2054 * cooked monitor interfaces.
2055 */
2056 return RX_DROP_MONITOR;
71364716
RR		 2057}
2058
f4f727a6
JM		 2059static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2060 struct ieee80211_mgmt *mgmt,
2061 size_t len)
fea14732
JM		 2062{
2063 struct ieee80211_local *local = sdata->local;
2064 struct sk_buff *skb;
2065 struct ieee80211_mgmt *resp;
2066
47846c9b 2067 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2068 /* Not to own unicast address */
2069 return;
2070 }
2071
46900298
JB		 2072 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2073 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2074 /* Not from the current AP or not associated yet. */
fea14732
JM		 2075 return;
2076 }
2077
2078 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2079 /* Too short SA Query request frame */
2080 return;
2081 }
2082
2083 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2084 if (skb == NULL)
2085 return;
2086
2087 skb_reserve(skb, local->hw.extra_tx_headroom);
2088 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2089 memset(resp, 0, 24);
2090 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2091 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2092 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2093 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2094 IEEE80211_STYPE_ACTION);
2095 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2096 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2097 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2098 memcpy(resp->u.action.u.sa_query.trans_id,
2099 mgmt->u.action.u.sa_query.trans_id,
2100 WLAN_SA_QUERY_TR_ID_LEN);
2101
62ae67be 2102 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2103}
2104
2e161f78
JB		 2105static ieee80211_rx_result debug_noinline
2106ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2107{
2108 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2109 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2110
2111 /*
2112 * From here on, look only at management frames.
2113 * Data and control frames are already handled,
2114 * and unknown (reserved) frames are useless.
2115 */
2116 if (rx->skb->len < 24)
2117 return RX_DROP_MONITOR;
2118
2119 if (!ieee80211_is_mgmt(mgmt->frame_control))
2120 return RX_DROP_MONITOR;
2121
554891e6 2122 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2123 return RX_DROP_MONITOR;
2124
2125 if (ieee80211_drop_unencrypted_mgmt(rx))
2126 return RX_DROP_UNUSABLE;
2127
2128 return RX_CONTINUE;
2129}
2130
de1ede7a
JB		 2131static ieee80211_rx_result debug_noinline
2132ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2133{
2134 struct ieee80211_local *local = rx->local;
eb9fb5b8 2135 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2136 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2137 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2138 int len = rx->skb->len;
2139
2140 if (!ieee80211_is_action(mgmt->frame_control))
2141 return RX_CONTINUE;
2142
026331c4
JM		 2143 /* drop too small frames */
2144 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2145 return RX_DROP_UNUSABLE;
de1ede7a 2146
026331c4 2147 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2148 return RX_DROP_UNUSABLE;
de1ede7a 2149
554891e6 2150 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2151 return RX_DROP_UNUSABLE;
97ebe12a 2152
de1ede7a
JB		 2153 switch (mgmt->u.action.category) {
2154 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2155 /*
2156 * The aggregation code is not prepared to handle
2157 * anything but STA/AP due to the BSSID handling;
2158 * IBSS could work in the code but isn't supported
2159 * by drivers or the standard.
2160 */
2161 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2162 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2163 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2164 break;
8abd3f9b 2165
026331c4
JM		 2166 /* verify action_code is present */
2167 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2168 break;
2169
de1ede7a
JB		 2170 switch (mgmt->u.action.u.addba_req.action_code) {
2171 case WLAN_ACTION_ADDBA_REQ:
2172 if (len < (IEEE80211_MIN_ACTION_SIZE +
2173 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2174 goto invalid;
2175 break;
de1ede7a
JB		 2176 case WLAN_ACTION_ADDBA_RESP:
2177 if (len < (IEEE80211_MIN_ACTION_SIZE +
2178 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2179 goto invalid;
2180 break;
de1ede7a
JB		 2181 case WLAN_ACTION_DELBA:
2182 if (len < (IEEE80211_MIN_ACTION_SIZE +
2183 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2184 goto invalid;
2185 break;
2186 default:
2187 goto invalid;
de1ede7a 2188 }
bed7ee6e 2189
8b58ff83 2190 goto queue;
39192c0b
JB		 2191 case WLAN_CATEGORY_SPECTRUM_MGMT:
2192 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2193 break;
46900298
JB		 2194
2195 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2196 break;
46900298 2197
026331c4
JM		 2198 /* verify action_code is present */
2199 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2200 break;
2201
39192c0b
JB		 2202 switch (mgmt->u.action.u.measurement.action_code) {
2203 case WLAN_ACTION_SPCT_MSR_REQ:
2204 if (len < (IEEE80211_MIN_ACTION_SIZE +
2205 sizeof(mgmt->u.action.u.measurement)))
84040805 2206 break;
39192c0b 2207 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2208 goto handled;
c481ec97
S		 2209 case WLAN_ACTION_SPCT_CHL_SWITCH:
2210 if (len < (IEEE80211_MIN_ACTION_SIZE +
2211 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2212 break;
c481ec97 2213
cc32abd4 2214 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2215 break;
cc32abd4 2216
46900298 2217 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2218 break;
c481ec97 2219
8b58ff83 2220 goto queue;
39192c0b
JB		 2221 }
2222 break;
fea14732
JM		 2223 case WLAN_CATEGORY_SA_QUERY:
2224 if (len < (IEEE80211_MIN_ACTION_SIZE +
2225 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2226 break;
2227
fea14732
JM		 2228 switch (mgmt->u.action.u.sa_query.action) {
2229 case WLAN_ACTION_SA_QUERY_REQUEST:
2230 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2231 break;
fea14732 2232 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2233 goto handled;
fea14732
JM		 2234 }
2235 break;
8db09850
TP		 2236 case WLAN_CATEGORY_SELF_PROTECTED:
2237 switch (mgmt->u.action.u.self_prot.action_code) {
2238 case WLAN_SP_MESH_PEERING_OPEN:
2239 case WLAN_SP_MESH_PEERING_CLOSE:
2240 case WLAN_SP_MESH_PEERING_CONFIRM:
2241 if (!ieee80211_vif_is_mesh(&sdata->vif))
2242 goto invalid;
2243 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2244 /* userspace handles this frame */
2245 break;
2246 goto queue;
2247 case WLAN_SP_MGK_INFORM:
2248 case WLAN_SP_MGK_ACK:
2249 if (!ieee80211_vif_is_mesh(&sdata->vif))
2250 goto invalid;
2251 break;
2252 }
2253 break;
d3aaec8a 2254 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2255 if (!ieee80211_vif_is_mesh(&sdata->vif))
2256 break;
25d49e4d
TP		 2257 if (mesh_action_is_path_sel(mgmt) &&
2258 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2259 break;
2260 goto queue;
84040805 2261 }
026331c4 2262
2e161f78
JB		 2263 return RX_CONTINUE;
2264
bed7ee6e 2265 invalid:
554891e6 2266 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2267 /* will return in the next handlers */
2268 return RX_CONTINUE;
2269
2270 handled:
2271 if (rx->sta)
2272 rx->sta->rx_packets++;
2273 dev_kfree_skb(rx->skb);
2274 return RX_QUEUED;
2275
2276 queue:
2277 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2278 skb_queue_tail(&sdata->skb_queue, rx->skb);
2279 ieee80211_queue_work(&local->hw, &sdata->work);
2280 if (rx->sta)
2281 rx->sta->rx_packets++;
2282 return RX_QUEUED;
2283}
2284
2285static ieee80211_rx_result debug_noinline
2286ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2287{
554891e6 2288 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2289
2290 /* skip known-bad action frames and return them in the next handler */
554891e6 2291 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2292 return RX_CONTINUE;
d7907448 2293
026331c4
JM		 2294 /*
2295 * Getting here means the kernel doesn't know how to handle
2296 * it, but maybe userspace does ... include returned frames
2297 * so userspace can register for those to know whether ones
2298 * it transmitted were processed or returned.
2299 */
026331c4 2300
2e161f78
JB		 2301 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2302 rx->skb->data, rx->skb->len,
2303 GFP_ATOMIC)) {
2304 if (rx->sta)
2305 rx->sta->rx_packets++;
2306 dev_kfree_skb(rx->skb);
2307 return RX_QUEUED;
2308 }
2309
2310
2311 return RX_CONTINUE;
2312}
2313
2314static ieee80211_rx_result debug_noinline
2315ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2316{
2317 struct ieee80211_local *local = rx->local;
2318 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2319 struct sk_buff *nskb;
2320 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2321 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2322
2323 if (!ieee80211_is_action(mgmt->frame_control))
2324 return RX_CONTINUE;
2325
2326 /*
2327 * For AP mode, hostapd is responsible for handling any action
2328 * frames that we didn't handle, including returning unknown
2329 * ones. For all other modes we will return them to the sender,
2330 * setting the 0x80 bit in the action category, as required by
2331 * 802.11-2007 7.3.1.11.
2332 * Newer versions of hostapd shall also use the management frame
2333 * registration mechanisms, but older ones still use cooked
2334 * monitor interfaces so push all frames there.
2335 */
554891e6 2336 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2337 (sdata->vif.type == NL80211_IFTYPE_AP ||
2338 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2339 return RX_DROP_MONITOR;
026331c4 2340
84040805
JB		 2341 /* do not return rejected action frames */
2342 if (mgmt->u.action.category & 0x80)
2343 return RX_DROP_UNUSABLE;
2344
2345 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2346 GFP_ATOMIC);
2347 if (nskb) {
292b4df6 2348 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2349
292b4df6
JL		 2350 nmgmt->u.action.category |= 0x80;
2351 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2352 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2353
2354 memset(nskb->cb, 0, sizeof(nskb->cb));
2355
2356 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2357 }
39192c0b
JB		 2358 dev_kfree_skb(rx->skb);
2359 return RX_QUEUED;
de1ede7a
JB		 2360}
2361
49461622 2362static ieee80211_rx_result debug_noinline
5cf121c3 2363ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2364{
eb9fb5b8 2365 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2366 ieee80211_rx_result rxs;
77a121c3
JB		 2367 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2368 __le16 stype;
571ecf67 2369
af6b6374
JB		 2370 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2371 if (rxs != RX_CONTINUE)
2372 return rxs;
2373
77a121c3 2374 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2375
77a121c3
JB		 2376 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2377 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2378 sdata->vif.type != NL80211_IFTYPE_STATION)
2379 return RX_DROP_MONITOR;
472dbc45 2380
77a121c3
JB		 2381 switch (stype) {
2382 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2383 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2384 /* process for all: mesh, mlme, ibss */
2385 break;
2386 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2387 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2388 if (is_multicast_ether_addr(mgmt->da) &&
2389 !is_broadcast_ether_addr(mgmt->da))
2390 return RX_DROP_MONITOR;
2391
77a121c3
JB		 2392 /* process only for station */
2393 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2394 return RX_DROP_MONITOR;
2395 break;
2396 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2397 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2398 /* process only for ibss */
2399 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2400 return RX_DROP_MONITOR;
2401 break;
2402 default:
2403 return RX_DROP_MONITOR;
2404 }
f9d540ee 2405
77a121c3 2406 /* queue up frame and kick off work to process it */
c1475ca9 2407 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2408 skb_queue_tail(&sdata->skb_queue, rx->skb);
2409 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2410 if (rx->sta)
2411 rx->sta->rx_packets++;
46900298 2412
77a121c3 2413 return RX_QUEUED;
571ecf67
JB		 2414}
2415
5cf121c3 2416/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2417static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2418 struct ieee80211_rate *rate)
3d30d949
MW		 2419{
2420 struct ieee80211_sub_if_data *sdata;
2421 struct ieee80211_local *local = rx->local;
2422 struct ieee80211_rtap_hdr {
2423 struct ieee80211_radiotap_header hdr;
2424 u8 flags;
5f0b7de5 2425 u8 rate_or_pad;
3d30d949
MW		 2426 __le16 chan_freq;
2427 __le16 chan_flags;
bc10502d 2428 } __packed *rthdr;
3d30d949
MW		 2429 struct sk_buff *skb = rx->skb, *skb2;
2430 struct net_device *prev_dev = NULL;
eb9fb5b8 2431 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2432
554891e6
JB		 2433 /*
2434 * If cooked monitor has been processed already, then
2435 * don't do it again. If not, set the flag.
2436 */
2437 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2438 goto out_free_skb;
554891e6 2439 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2440
3d30d949
MW		 2441 if (skb_headroom(skb) < sizeof(*rthdr) &&
2442 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2443 goto out_free_skb;
2444
2445 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2446 memset(rthdr, 0, sizeof(*rthdr));
2447 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2448 rthdr->hdr.it_present =
2449 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2450 (1 << IEEE80211_RADIOTAP_CHANNEL));
2451
5f0b7de5
JB		 2452 if (rate) {
2453 rthdr->rate_or_pad = rate->bitrate / 5;
2454 rthdr->hdr.it_present |=
2455 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2456 }
3d30d949
MW		 2457 rthdr->chan_freq = cpu_to_le16(status->freq);
2458
2459 if (status->band == IEEE80211_BAND_5GHZ)
2460 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2461 IEEE80211_CHAN_5GHZ);
2462 else
2463 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2464 IEEE80211_CHAN_2GHZ);
2465
2466 skb_set_mac_header(skb, 0);
2467 skb->ip_summed = CHECKSUM_UNNECESSARY;
2468 skb->pkt_type = PACKET_OTHERHOST;
2469 skb->protocol = htons(ETH_P_802_2);
2470
2471 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2472 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2473 continue;
2474
05c914fe 2475 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2476 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2477 continue;
2478
2479 if (prev_dev) {
2480 skb2 = skb_clone(skb, GFP_ATOMIC);
2481 if (skb2) {
2482 skb2->dev = prev_dev;
5548a8a1 2483 netif_receive_skb(skb2);
3d30d949
MW		 2484 }
2485 }
2486
2487 prev_dev = sdata->dev;
2488 sdata->dev->stats.rx_packets++;
2489 sdata->dev->stats.rx_bytes += skb->len;
2490 }
2491
2492 if (prev_dev) {
2493 skb->dev = prev_dev;
5548a8a1 2494 netif_receive_skb(skb);
554891e6
JB		 2495 return;
2496 }
3d30d949
MW		 2497
2498 out_free_skb:
2499 dev_kfree_skb(skb);
2500}
2501
aa0c8636
CL		 2502static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2503 ieee80211_rx_result res)
2504{
2505 switch (res) {
2506 case RX_DROP_MONITOR:
2507 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2508 if (rx->sta)
2509 rx->sta->rx_dropped++;
2510 /* fall through */
2511 case RX_CONTINUE: {
2512 struct ieee80211_rate *rate = NULL;
2513 struct ieee80211_supported_band *sband;
2514 struct ieee80211_rx_status *status;
2515
2516 status = IEEE80211_SKB_RXCB((rx->skb));
2517
2518 sband = rx->local->hw.wiphy->bands[status->band];
2519 if (!(status->flag & RX_FLAG_HT))
2520 rate = &sband->bitrates[status->rate_idx];
2521
2522 ieee80211_rx_cooked_monitor(rx, rate);
2523 break;
2524 }
2525 case RX_DROP_UNUSABLE:
2526 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2527 if (rx->sta)
2528 rx->sta->rx_dropped++;
2529 dev_kfree_skb(rx->skb);
2530 break;
2531 case RX_QUEUED:
2532 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2533 break;
2534 }
2535}
571ecf67 2536
24a8fdad 2537static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2538{
58905290 2539 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2540 struct sk_buff *skb;
8944b79f 2541
e32f85f7
LCC		 2542#define CALL_RXH(rxh) \
2543 do { \
2544 res = rxh(rx); \
2545 if (res != RX_CONTINUE) \
2569a826 2546 goto rxh_next; \
e32f85f7 2547 } while (0);
49461622 2548
24a8fdad
CL		 2549 spin_lock(&rx->local->rx_skb_queue.lock);
2550 if (rx->local->running_rx_handler)
2551 goto unlock;
2552
2553 rx->local->running_rx_handler = true;
2554
2555 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2556 spin_unlock(&rx->local->rx_skb_queue.lock);
2557
2569a826
JB		 2558 /*
2559 * all the other fields are valid across frames
2560 * that belong to an aMPDU since they are on the
2561 * same TID from the same station
2562 */
2563 rx->skb = skb;
2564
2565 CALL_RXH(ieee80211_rx_h_decrypt)
2566 CALL_RXH(ieee80211_rx_h_check_more_data)
2567 CALL_RXH(ieee80211_rx_h_sta_process)
2568 CALL_RXH(ieee80211_rx_h_defragment)
2569 CALL_RXH(ieee80211_rx_h_ps_poll)
2570 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2571 /* must be after MMIC verify so header is counted in MPDU mic */
2572 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2573 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2574#ifdef CONFIG_MAC80211_MESH
aa0c8636 2575 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2576 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2577#endif
2569a826 2578 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2579 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2580 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2581 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2582 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2583 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2584 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2585
aa0c8636
CL		 2586 rxh_next:
2587 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2588 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2589#undef CALL_RXH
aa0c8636 2590 }
24a8fdad
CL		 2591
2592 rx->local->running_rx_handler = false;
2593
2594 unlock:
2595 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2596}
2597
4406c376 2598static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2599{
aa0c8636
CL		 2600 ieee80211_rx_result res = RX_DROP_MONITOR;
2601
aa0c8636
CL		 2602#define CALL_RXH(rxh) \
2603 do { \
2604 res = rxh(rx); \
2605 if (res != RX_CONTINUE) \
2606 goto rxh_next; \
2607 } while (0);
2608
2609 CALL_RXH(ieee80211_rx_h_passive_scan)
2610 CALL_RXH(ieee80211_rx_h_check)
2611
24a8fdad 2612 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2613
24a8fdad 2614 ieee80211_rx_handlers(rx);
aa0c8636 2615 return;
49461622 2616
2569a826 2617 rxh_next:
aa0c8636
CL		 2618 ieee80211_rx_handlers_result(rx, res);
2619
2620#undef CALL_RXH
58905290
JB		 2621}
2622
2bff8ebf 2623/*
dd318575
JB		 2624 * This function makes calls into the RX path, therefore
2625 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2626 */
2627void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2628{
554891e6
JB		 2629 struct ieee80211_rx_data rx = {
2630 .sta = sta,
2631 .sdata = sta->sdata,
2632 .local = sta->local,
9e26297a
JB		 2633 /* This is OK -- must be QoS data frame */
2634 .security_idx = tid,
2635 .seqno_idx = tid,
fcf8bd3b 2636 .flags = 0,
554891e6 2637 };
2c15a0cf
CL		 2638 struct tid_ampdu_rx *tid_agg_rx;
2639
2640 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2641 if (!tid_agg_rx)
2642 return;
2bff8ebf 2643
2c15a0cf 2644 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2645 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2646 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2647
24a8fdad 2648 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2649}
2650
571ecf67
JB		 2651/* main receive path */
2652
20b01f80 2653static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2654 struct ieee80211_hdr *hdr)
2655{
20b01f80 2656 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2657 struct sk_buff *skb = rx->skb;
2658 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2659 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2660 int multicast = is_multicast_ether_addr(hdr->addr1);
2661
51fb61e7 2662 switch (sdata->vif.type) {
05c914fe 2663 case NL80211_IFTYPE_STATION:
9bc383de 2664 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2665 return 0;
77fdaa12 2666 if (!multicast &&
47846c9b 2667 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2668 if (!(sdata->dev->flags & IFF_PROMISC) ||
2669 sdata->u.mgd.use_4addr)
23a24def 2670 return 0;
554891e6 2671 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2672 }
2673 break;
05c914fe 2674 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2675 if (!bssid)
2676 return 0;
a7767f95 2677 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2678 return 1;
87291c02 2679 }
46900298 2680 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2681 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2682 return 0;
554891e6 2683 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2684 } else if (!multicast &&
47846c9b 2685 compare_ether_addr(sdata->vif.addr,
23a24def 2686 hdr->addr1) != 0) {
4150c572 2687 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2688 return 0;
554891e6 2689 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2690 } else if (!rx->sta) {
2691 int rate_idx;
eb9fb5b8 2692 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2693 rate_idx = 0; /* TODO: HT rates */
2694 else
eb9fb5b8 2695 rate_idx = status->rate_idx;
34e89507
JB		 2696 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2697 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2698 }
23a24def 2699 break;
05c914fe 2700 case NL80211_IFTYPE_MESH_POINT:
6032f934 2701 if (!multicast &&
47846c9b 2702 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2703 hdr->addr1) != 0) {
2704 if (!(sdata->dev->flags & IFF_PROMISC))
2705 return 0;
2706
554891e6 2707 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2708 }
2709 break;
05c914fe
JB		 2710 case NL80211_IFTYPE_AP_VLAN:
2711 case NL80211_IFTYPE_AP:
23a24def 2712 if (!bssid) {
47846c9b 2713 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2714 hdr->addr1))
2715 return 0;
2716 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2717 sdata->vif.addr)) {
771bbd09 2718 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2719 !ieee80211_is_beacon(hdr->frame_control) &&
2720 !(ieee80211_is_action(hdr->frame_control) &&
2721 sdata->vif.p2p))
23a24def 2722 return 0;
554891e6 2723 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2724 }
23a24def 2725 break;
05c914fe 2726 case NL80211_IFTYPE_WDS:
a7767f95 2727 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2728 return 0;
2729 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2730 return 0;
2731 break;
2ca27bcf 2732 default:
fb1c1cd6
JB		 2733 /* should never get here */
2734 WARN_ON(1);
2735 break;
23a24def
JB		 2736 }
2737
2738 return 1;
2739}
2740
4406c376
JB		 2741/*
2742 * This function returns whether or not the SKB
2743 * was destined for RX processing or not, which,
2744 * if consume is true, is equivalent to whether
2745 * or not the skb was consumed.
2746 */
2747static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2748 struct sk_buff *skb, bool consume)
2749{
2750 struct ieee80211_local *local = rx->local;
2751 struct ieee80211_sub_if_data *sdata = rx->sdata;
2752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2753 struct ieee80211_hdr *hdr = (void *)skb->data;
2754 int prepares;
2755
2756 rx->skb = skb;
554891e6 2757 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2758 prepares = prepare_for_handlers(rx, hdr);
2759
2760 if (!prepares)
2761 return false;
2762
4406c376
JB		 2763 if (!consume) {
2764 skb = skb_copy(skb, GFP_ATOMIC);
2765 if (!skb) {
2766 if (net_ratelimit())
2767 wiphy_debug(local->hw.wiphy,
b305dae4 2768 "failed to copy skb for %s\n",
4406c376
JB		 2769 sdata->name);
2770 return true;
2771 }
2772
2773 rx->skb = skb;
2774 }
2775
2776 ieee80211_invoke_rx_handlers(rx);
2777 return true;
2778}
2779
571ecf67 2780/*
6368e4b1
RR		 2781 * This is the actual Rx frames handler. as it blongs to Rx path it must
2782 * be called with rcu_read_lock protection.
571ecf67 2783 */
71ebb4aa 2784static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2785 struct sk_buff *skb)
571ecf67 2786{
554891e6 2787 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2788 struct ieee80211_local *local = hw_to_local(hw);
2789 struct ieee80211_sub_if_data *sdata;
571ecf67 2790 struct ieee80211_hdr *hdr;
e3cf8b3f 2791 __le16 fc;
5cf121c3 2792 struct ieee80211_rx_data rx;
4406c376 2793 struct ieee80211_sub_if_data *prev;
56af3268 2794 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2795 int err = 0;
571ecf67 2796
e3cf8b3f 2797 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2798 memset(&rx, 0, sizeof(rx));
2799 rx.skb = skb;
2800 rx.local = local;
72abd81b 2801
e3cf8b3f 2802 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2803 local->dot11ReceivedFragmentCount++;
571ecf67 2804
142b9f50 2805 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2806 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2807 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2808
e3cf8b3f
ZY		 2809 if (ieee80211_is_mgmt(fc))
2810 err = skb_linearize(skb);
2811 else
2812 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2813
2814 if (err) {
2815 dev_kfree_skb(skb);
2816 return;
2817 }
2818
2819 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2820 ieee80211_parse_qos(&rx);
d1c3a37c 2821 ieee80211_verify_alignment(&rx);
38f3714d 2822
e3cf8b3f 2823 if (ieee80211_is_data(fc)) {
56af3268 2824 prev_sta = NULL;
4406c376 2825
2a33bee2 2826 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2827 if (!prev_sta) {
2828 prev_sta = sta;
2829 continue;
2830 }
2831
2832 rx.sta = prev_sta;
2833 rx.sdata = prev_sta->sdata;
4406c376 2834 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2835
56af3268 2836 prev_sta = sta;
4406c376 2837 }
56af3268
BG		 2838
2839 if (prev_sta) {
2840 rx.sta = prev_sta;
2841 rx.sdata = prev_sta->sdata;
2842
4406c376 2843 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2844 return;
8e26d5ad 2845 goto out;
56af3268 2846 }
4406c376
JB		 2847 }
2848
4b0dd98e 2849 prev = NULL;
b2e7771e 2850
4b0dd98e
JB		 2851 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2852 if (!ieee80211_sdata_running(sdata))
2853 continue;
340e11f3 2854
4b0dd98e
JB		 2855 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2856 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2857 continue;
340e11f3 2858
4b0dd98e
JB		 2859 /*
2860 * frame is destined for this interface, but if it's
2861 * not also for the previous one we handle that after
2862 * the loop to avoid copying the SKB once too much
2863 */
4bb29f8c 2864
4b0dd98e 2865 if (!prev) {
abe60632 2866 prev = sdata;
4b0dd98e 2867 continue;
340e11f3 2868 }
4bb29f8c 2869
2a33bee2 2870 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2871 rx.sdata = prev;
2872 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2873
4b0dd98e
JB		 2874 prev = sdata;
2875 }
2876
2877 if (prev) {
2a33bee2 2878 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2879 rx.sdata = prev;
4406c376 2880
4b0dd98e
JB		 2881 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2882 return;
571ecf67 2883 }
4406c376 2884
8e26d5ad 2885 out:
4406c376 2886 dev_kfree_skb(skb);
571ecf67 2887}
6368e4b1
RR		 2888
2889/*
2890 * This is the receive path handler. It is called by a low level driver when an
2891 * 802.11 MPDU is received from the hardware.
2892 */
103bf9f7 2893void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2894{
2895 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2896 struct ieee80211_rate *rate = NULL;
2897 struct ieee80211_supported_band *sband;
f1d58c25 2898 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2899
d20ef63d
JB		 2900 WARN_ON_ONCE(softirq_count() == 0);
2901
77a980dc
JB		 2902 if (WARN_ON(status->band < 0 ||
2903 status->band >= IEEE80211_NUM_BANDS))
2904 goto drop;
8318d78a
JB		 2905
2906 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2907 if (WARN_ON(!sband))
2908 goto drop;
8318d78a 2909
89c3a8ac
JB		 2910 /*
2911 * If we're suspending, it is possible although not too likely
2912 * that we'd be receiving frames after having already partially
2913 * quiesced the stack. We can't process such frames then since
2914 * that might, for example, cause stations to be added or other
2915 * driver callbacks be invoked.
2916 */
77a980dc
JB		 2917 if (unlikely(local->quiescing || local->suspended))
2918 goto drop;
89c3a8ac 2919
ea77f12f
JB		 2920 /*
2921 * The same happens when we're not even started,
2922 * but that's worth a warning.
2923 */
77a980dc
JB		 2924 if (WARN_ON(!local->started))
2925 goto drop;
ea77f12f 2926
fc885189 2927 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2928 /*
fc885189
JB		 2929 * Validate the rate, unless a PLCP error means that
2930 * we probably can't have a valid rate here anyway.
e5d6eb83 2931 */
fc885189
JB		 2932
2933 if (status->flag & RX_FLAG_HT) {
2934 /*
2935 * rate_idx is MCS index, which can be [0-76]
2936 * as documented on:
2937 *
2938 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2939 *
2940 * Anything else would be some sort of driver or
2941 * hardware error. The driver should catch hardware
2942 * errors.
2943 */
2944 if (WARN((status->rate_idx < 0 ||
2945 status->rate_idx > 76),
2946 "Rate marked as an HT rate but passed "
2947 "status->rate_idx is not "
2948 "an MCS index [0-76]: %d (0x%02x)\n",
2949 status->rate_idx,
2950 status->rate_idx))
2951 goto drop;
2952 } else {
2953 if (WARN_ON(status->rate_idx < 0 ||
2954 status->rate_idx >= sband->n_bitrates))
2955 goto drop;
2956 rate = &sband->bitrates[status->rate_idx];
2957 }
0fb8ca45 2958 }
6368e4b1 2959
554891e6
JB		 2960 status->rx_flags = 0;
2961
6368e4b1
RR		 2962 /*
2963 * key references and virtual interfaces are protected using RCU
2964 * and this requires that we are in a read-side RCU section during
2965 * receive processing
2966 */
2967 rcu_read_lock();
2968
2969 /*
2970 * Frames with failed FCS/PLCP checksum are not returned,
2971 * all other frames are returned without radiotap header
2972 * if it was previously present.
2973 * Also, frames with less than 16 bytes are dropped.
2974 */
f1d58c25 2975 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2976 if (!skb) {
2977 rcu_read_unlock();
2978 return;
2979 }
2980
e1e54068
JB		 2981 ieee80211_tpt_led_trig_rx(local,
2982 ((struct ieee80211_hdr *)skb->data)->frame_control,
2983 skb->len);
071d9ac2 2984 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2985
2986 rcu_read_unlock();
77a980dc
JB		 2987
2988 return;
2989 drop:
2990 kfree_skb(skb);
6368e4b1 2991}
103bf9f7 2992EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2993
2994/* This is a version of the rx handler that can be called from hard irq
2995 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2996void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2997{
2998 struct ieee80211_local *local = hw_to_local(hw);
2999
3000 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3001
571ecf67
JB		 3002 skb->pkt_type = IEEE80211_RX_MSG;
3003 skb_queue_tail(&local->skb_queue, skb);
3004 tasklet_schedule(&local->tasklet);
3005}
3006EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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