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ieee80211: add mesh action codes
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
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 &&
0c2530ce 853 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC))))
e4c26add 854 return RX_DROP_MONITOR;
571ecf67 855
9ae54c84 856 return RX_CONTINUE;
570bd537
JB		 857}
858
859
49461622 860static ieee80211_rx_result debug_noinline
5cf121c3 861ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 862{
eb9fb5b8
JB		 863 struct sk_buff *skb = rx->skb;
864 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
865 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 866 int keyidx;
867 int hdrlen;
e4c26add 868 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 869 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 870 int mmie_keyidx = -1;
761ab470 871 __le16 fc;
570bd537 872
3017b80b
JB		 873 /*
874 * Key selection 101
875 *
3cfcf6ac 876 * There are four types of keys:
3017b80b 877 * - GTK (group keys)
3cfcf6ac 878 * - IGTK (group keys for management frames)
3017b80b
JB		 879 * - PTK (pairwise keys)
880 * - STK (station-to-station pairwise keys)
881 *
882 * When selecting a key, we have to distinguish between multicast
883 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 884 * use PTKs and STKs while the former always use GTKs and IGTKs.
885 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
886 * unicast frames can also use key indices like GTKs. Hence, if we
887 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 888 *
8dc06a1c
JB		 889 * Note that in a regular BSS, multicast frames are sent by the
890 * AP only, associated stations unicast the frame to the AP first
891 * which then multicasts it on their behalf.
892 *
3017b80b
JB		 893 * There is also a slight problem in IBSS mode: GTKs are negotiated
894 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 895 * The spec seems to expect that one negotiates the same key with
896 * every station but there's no such requirement; VLANs could be
897 * possible.
3017b80b
JB		 898 */
899
3017b80b 900 /*
1990af8d 901 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 902 * addressed to us nor a multicast frame.
903 */
554891e6 904 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 905 return RX_CONTINUE;
3017b80b 906
2569a826
JB		 907 /* start without a key */
908 rx->key = NULL;
909
d4e46a3d 910 if (rx->sta)
e31b8213 911 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 912
761ab470
JB		 913 fc = hdr->frame_control;
914
915 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 916 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
917
e31b8213
JB		 918 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
919 rx->key = sta_ptk;
dc1580dd
JB		 920 if ((status->flag & RX_FLAG_DECRYPTED) &&
921 (status->flag & RX_FLAG_IV_STRIPPED))
922 return RX_CONTINUE;
0c7c10c7 923 /* Skip decryption if the frame is not protected. */
761ab470 924 if (!ieee80211_has_protected(fc))
0c7c10c7 925 return RX_CONTINUE;
3cfcf6ac
JM		 926 } else if (mmie_keyidx >= 0) {
927 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 928 if ((status->flag & RX_FLAG_DECRYPTED) &&
929 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 930 return RX_CONTINUE;
931
932 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
933 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
934 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 935 if (rx->sta)
936 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
937 if (!rx->key)
938 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 939 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 940 /*
941 * The frame was not protected, so skip decryption. However, we
942 * need to set rx->key if there is a key that could have been
943 * used so that the frame may be dropped if encryption would
944 * have been expected.
945 */
946 struct ieee80211_key *key = NULL;
897bed8b
JB		 947 struct ieee80211_sub_if_data *sdata = rx->sdata;
948 int i;
949
761ab470 950 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 951 is_multicast_ether_addr(hdr->addr1) &&
952 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
953 rx->key = key;
897bed8b
JB		 954 else {
955 if (rx->sta) {
956 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
957 key = rcu_dereference(rx->sta->gtk[i]);
958 if (key)
959 break;
960 }
961 }
962 if (!key) {
963 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
964 key = rcu_dereference(sdata->keys[i]);
965 if (key)
966 break;
967 }
968 }
969 if (key)
970 rx->key = key;
971 }
0c7c10c7 972 return RX_CONTINUE;
571ecf67 973 } else {
39184b15 974 u8 keyid;
3017b80b
JB		 975 /*
976 * The device doesn't give us the IV so we won't be
977 * able to look up the key. That's ok though, we
978 * don't need to decrypt the frame, we just won't
979 * be able to keep statistics accurate.
980 * Except for key threshold notifications, should
981 * we somehow allow the driver to tell us which key
982 * the hardware used if this flag is set?
983 */
eb9fb5b8
JB		 984 if ((status->flag & RX_FLAG_DECRYPTED) &&
985 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 986 return RX_CONTINUE;
3017b80b 987
761ab470 988 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 989
990 if (rx->skb->len < 8 + hdrlen)
e4c26add 991 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 992
993 /*
994 * no need to call ieee80211_wep_get_keyidx,
995 * it verifies a bunch of things we've done already
996 */
39184b15
ZY		 997 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
998 keyidx = keyid >> 6;
3017b80b 999
e31b8213
JB		 1000 /* check per-station GTK first, if multicast packet */
1001 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1002 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1003
e31b8213
JB		 1004 /* if not found, try default key */
1005 if (!rx->key) {
1006 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1007
1008 /*
1009 * RSNA-protected unicast frames should always be
1010 * sent with pairwise or station-to-station keys,
1011 * but for WEP we allow using a key index as well.
1012 */
1013 if (rx->key &&
1014 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1016 !is_multicast_ether_addr(hdr->addr1))
1017 rx->key = NULL;
1018 }
571ecf67
JB		 1019 }
1020
3017b80b 1021 if (rx->key) {
95acac61
JB		 1022 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1023 return RX_DROP_MONITOR;
1024
571ecf67 1025 rx->key->tx_rx_count++;
011bfcc4 1026 /* TODO: add threshold stuff again */
1990af8d 1027 } else {
e4c26add 1028 return RX_DROP_MONITOR;
70f08765
JB		 1029 }
1030
39184b15
ZY		 1031 if (skb_linearize(rx->skb))
1032 return RX_DROP_UNUSABLE;
761ab470 1033 /* the hdr variable is invalid now! */
1990af8d 1034
97359d12
JB		 1035 switch (rx->key->conf.cipher) {
1036 case WLAN_CIPHER_SUITE_WEP40:
1037 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1038 /* Check for weak IVs if possible */
1039 if (rx->sta && ieee80211_is_data(fc) &&
1040 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1041 !(status->flag & RX_FLAG_DECRYPTED)) &&
1042 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1043 rx->sta->wep_weak_iv_count++;
1044
e2f036da
MN		 1045 result = ieee80211_crypto_wep_decrypt(rx);
1046 break;
97359d12 1047 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1048 result = ieee80211_crypto_tkip_decrypt(rx);
1049 break;
97359d12 1050 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1051 result = ieee80211_crypto_ccmp_decrypt(rx);
1052 break;
97359d12 1053 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1054 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1055 break;
3ffc2a90
JB		 1056 default:
1057 /*
1058 * We can reach here only with HW-only algorithms
1059 * but why didn't it decrypt the frame?!
1060 */
1061 return RX_DROP_UNUSABLE;
70f08765
JB		 1062 }
1063
e2f036da 1064 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1065 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1066
1067 return result;
70f08765
JB		 1068}
1069
572e0012
KV		 1070static ieee80211_rx_result debug_noinline
1071ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1072{
1073 struct ieee80211_local *local;
1074 struct ieee80211_hdr *hdr;
1075 struct sk_buff *skb;
1076
1077 local = rx->local;
1078 skb = rx->skb;
1079 hdr = (struct ieee80211_hdr *) skb->data;
1080
1081 if (!local->pspolling)
1082 return RX_CONTINUE;
1083
1084 if (!ieee80211_has_fromds(hdr->frame_control))
1085 /* this is not from AP */
1086 return RX_CONTINUE;
1087
1088 if (!ieee80211_is_data(hdr->frame_control))
1089 return RX_CONTINUE;
1090
1091 if (!ieee80211_has_moredata(hdr->frame_control)) {
1092 /* AP has no more frames buffered for us */
1093 local->pspolling = false;
1094 return RX_CONTINUE;
1095 }
1096
1097 /* more data bit is set, let's request a new frame from the AP */
1098 ieee80211_send_pspoll(local, rx->sdata);
1099
1100 return RX_CONTINUE;
1101}
1102
133b8226 1103static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1104{
133b8226 1105 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1106 struct ieee80211_local *local = sdata->local;
0795af57 1107
3e122be0 1108 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1109 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1110 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1111 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1112#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1113 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1114 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1115#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1116}
1117
ff9458d3 1118static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1119{
133b8226 1120 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1121
3e122be0 1122 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1123
571ecf67 1124#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1125 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1126 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1127#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1128
af818581 1129 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1130#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1131 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1132 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1133#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1134 return;
1135 }
1136
1137 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1138}
1139
d057e5a3
AN		 1140int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1141{
1142 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1143 bool in_ps;
1144
1145 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1146
1147 /* Don't let the same PS state be set twice */
1148 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1149 if ((start && in_ps) || (!start && !in_ps))
1150 return -EINVAL;
1151
1152 if (start)
1153 ap_sta_ps_start(sta_inf);
1154 else
1155 ap_sta_ps_end(sta_inf);
1156
1157 return 0;
1158}
1159EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1160
49461622 1161static ieee80211_rx_result debug_noinline
5cf121c3 1162ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1163{
1164 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1165 struct sk_buff *skb = rx->skb;
1166 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1167 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1168
1169 if (!sta)
9ae54c84 1170 return RX_CONTINUE;
571ecf67 1171
b291ba11
JB		 1172 /*
1173 * Update last_rx only for IBSS packets which are for the current
1174 * BSSID to avoid keeping the current IBSS network alive in cases
1175 * where other STAs start using different BSSID.
1176 */
05c914fe 1177 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1178 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1179 NL80211_IFTYPE_ADHOC);
3af6334c 1180 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1181 sta->last_rx = jiffies;
3af6334c
FF		 1182 if (ieee80211_is_data(hdr->frame_control)) {
1183 sta->last_rx_rate_idx = status->rate_idx;
1184 sta->last_rx_rate_flag = status->flag;
1185 }
1186 }
b291ba11
JB		 1187 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1188 /*
33b64eb2
LCC		 1189 * Mesh beacons will update last_rx when if they are found to
1190 * match the current local configuration when processed.
571ecf67 1191 */
b291ba11 1192 sta->last_rx = jiffies;
3af6334c
FF		 1193 if (ieee80211_is_data(hdr->frame_control)) {
1194 sta->last_rx_rate_idx = status->rate_idx;
1195 sta->last_rx_rate_flag = status->flag;
1196 }
571ecf67
JB		 1197 }
1198
554891e6 1199 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1200 return RX_CONTINUE;
571ecf67 1201
3cf335d5
KV		 1202 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1203 ieee80211_sta_rx_notify(rx->sdata, hdr);
1204
571ecf67
JB		 1205 sta->rx_fragments++;
1206 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1207 sta->last_signal = status->signal;
541a45a1 1208 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1209
72eaa43a
JB		 1210 /*
1211 * Change STA power saving mode only at the end of a frame
1212 * exchange sequence.
1213 */
d057e5a3
AN		 1214 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1215 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1216 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1217 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1218 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1219 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1220 /*
1221 * Ignore doze->wake transitions that are
1222 * indicated by non-data frames, the standard
1223 * is unclear here, but for example going to
1224 * PS mode and then scanning would cause a
1225 * doze->wake transition for the probe request,
1226 * and that is clearly undesirable.
1227 */
1228 if (ieee80211_is_data(hdr->frame_control) &&
1229 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1230 ap_sta_ps_end(sta);
72eaa43a
JB		 1231 } else {
1232 if (ieee80211_has_pm(hdr->frame_control))
1233 ap_sta_ps_start(sta);
1234 }
571ecf67
JB		 1235 }
1236
22403def
JB		 1237 /*
1238 * Drop (qos-)data::nullfunc frames silently, since they
1239 * are used only to control station power saving mode.
1240 */
1241 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1242 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1243 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1244
1245 /*
1246 * If we receive a 4-addr nullfunc frame from a STA
1247 * that was not moved to a 4-addr STA vlan yet, drop
1248 * the frame to the monitor interface, to make sure
1249 * that hostapd sees it
1250 */
1251 if (ieee80211_has_a4(hdr->frame_control) &&
1252 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1253 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1254 !rx->sdata->u.vlan.sta)))
1255 return RX_DROP_MONITOR;
22403def
JB		 1256 /*
1257 * Update counter and free packet here to avoid
1258 * counting this as a dropped packed.
1259 */
571ecf67
JB		 1260 sta->rx_packets++;
1261 dev_kfree_skb(rx->skb);
9ae54c84 1262 return RX_QUEUED;
571ecf67
JB		 1263 }
1264
9ae54c84 1265 return RX_CONTINUE;
571ecf67
JB		 1266} /* ieee80211_rx_h_sta_process */
1267
571ecf67
JB		 1268static inline struct ieee80211_fragment_entry *
1269ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1270 unsigned int frag, unsigned int seq, int rx_queue,
1271 struct sk_buff **skb)
1272{
1273 struct ieee80211_fragment_entry *entry;
1274 int idx;
1275
1276 idx = sdata->fragment_next;
1277 entry = &sdata->fragments[sdata->fragment_next++];
1278 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1279 sdata->fragment_next = 0;
1280
1281 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1282#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1283 struct ieee80211_hdr *hdr =
1284 (struct ieee80211_hdr *) entry->skb_list.next->data;
1285 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1286 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1287 "addr1=%pM addr2=%pM\n",
47846c9b 1288 sdata->name, idx,
571ecf67 1289 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1290 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1291#endif
571ecf67
JB		 1292 __skb_queue_purge(&entry->skb_list);
1293 }
1294
1295 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1296 *skb = NULL;
1297 entry->first_frag_time = jiffies;
1298 entry->seq = seq;
1299 entry->rx_queue = rx_queue;
1300 entry->last_frag = frag;
1301 entry->ccmp = 0;
1302 entry->extra_len = 0;
1303
1304 return entry;
1305}
1306
1307static inline struct ieee80211_fragment_entry *
1308ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1309 unsigned int frag, unsigned int seq,
571ecf67
JB		 1310 int rx_queue, struct ieee80211_hdr *hdr)
1311{
1312 struct ieee80211_fragment_entry *entry;
1313 int i, idx;
1314
1315 idx = sdata->fragment_next;
1316 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1317 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1318
1319 idx--;
1320 if (idx < 0)
1321 idx = IEEE80211_FRAGMENT_MAX - 1;
1322
1323 entry = &sdata->fragments[idx];
1324 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1325 entry->rx_queue != rx_queue ||
1326 entry->last_frag + 1 != frag)
1327 continue;
1328
b73d70ad 1329 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1330
b73d70ad
HH		 1331 /*
1332 * Check ftype and addresses are equal, else check next fragment
1333 */
1334 if (((hdr->frame_control ^ f_hdr->frame_control) &
1335 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1336 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1337 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1338 continue;
1339
ab46623e 1340 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1341 __skb_queue_purge(&entry->skb_list);
1342 continue;
1343 }
1344 return entry;
1345 }
1346
1347 return NULL;
1348}
1349
49461622 1350static ieee80211_rx_result debug_noinline
5cf121c3 1351ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1352{
1353 struct ieee80211_hdr *hdr;
1354 u16 sc;
358c8d9d 1355 __le16 fc;
571ecf67
JB		 1356 unsigned int frag, seq;
1357 struct ieee80211_fragment_entry *entry;
1358 struct sk_buff *skb;
554891e6 1359 struct ieee80211_rx_status *status;
571ecf67 1360
b73d70ad 1361 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1362 fc = hdr->frame_control;
571ecf67
JB		 1363 sc = le16_to_cpu(hdr->seq_ctrl);
1364 frag = sc & IEEE80211_SCTL_FRAG;
1365
358c8d9d 1366 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1367 (rx->skb)->len < 24 ||
1368 is_multicast_ether_addr(hdr->addr1))) {
1369 /* not fragmented */
1370 goto out;
1371 }
1372 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1373
e3cf8b3f
ZY		 1374 if (skb_linearize(rx->skb))
1375 return RX_DROP_UNUSABLE;
1376
058897a4
AK		 1377 /*
1378 * skb_linearize() might change the skb->data and
1379 * previously cached variables (in this case, hdr) need to
1380 * be refreshed with the new data.
1381 */
1382 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1383 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1384
1385 if (frag == 0) {
1386 /* This is the first fragment of a new frame. */
1387 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1388 rx->seqno_idx, &(rx->skb));
97359d12 1389 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1390 ieee80211_has_protected(fc)) {
9e26297a 1391 int queue = rx->security_idx;
571ecf67
JB		 1392 /* Store CCMP PN so that we can verify that the next
1393 * fragment has a sequential PN value. */
1394 entry->ccmp = 1;
1395 memcpy(entry->last_pn,
9190252c 1396 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1397 CCMP_PN_LEN);
1398 }
9ae54c84 1399 return RX_QUEUED;
571ecf67
JB		 1400 }
1401
1402 /* This is a fragment for a frame that should already be pending in
1403 * fragment cache. Add this fragment to the end of the pending entry.
1404 */
9e26297a
JB		 1405 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1406 rx->seqno_idx, hdr);
571ecf67
JB		 1407 if (!entry) {
1408 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1409 return RX_DROP_MONITOR;
571ecf67
JB		 1410 }
1411
1412 /* Verify that MPDUs within one MSDU have sequential PN values.
1413 * (IEEE 802.11i, 8.3.3.4.5) */
1414 if (entry->ccmp) {
1415 int i;
1416 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1417 int queue;
97359d12 1418 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1419 return RX_DROP_UNUSABLE;
571ecf67
JB		 1420 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1421 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1422 pn[i]++;
1423 if (pn[i])
1424 break;
1425 }
9e26297a 1426 queue = rx->security_idx;
9190252c 1427 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1428 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1429 return RX_DROP_UNUSABLE;
571ecf67
JB		 1430 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1431 }
1432
358c8d9d 1433 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1434 __skb_queue_tail(&entry->skb_list, rx->skb);
1435 entry->last_frag = frag;
1436 entry->extra_len += rx->skb->len;
358c8d9d 1437 if (ieee80211_has_morefrags(fc)) {
571ecf67 1438 rx->skb = NULL;
9ae54c84 1439 return RX_QUEUED;
571ecf67
JB		 1440 }
1441
1442 rx->skb = __skb_dequeue(&entry->skb_list);
1443 if (skb_tailroom(rx->skb) < entry->extra_len) {
1444 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1445 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1446 GFP_ATOMIC))) {
1447 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1448 __skb_queue_purge(&entry->skb_list);
e4c26add 1449 return RX_DROP_UNUSABLE;
571ecf67
JB		 1450 }
1451 }
1452 while ((skb = __skb_dequeue(&entry->skb_list))) {
1453 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1454 dev_kfree_skb(skb);
1455 }
1456
1457 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1458 status = IEEE80211_SKB_RXCB(rx->skb);
1459 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1460
1461 out:
1462 if (rx->sta)
1463 rx->sta->rx_packets++;
1464 if (is_multicast_ether_addr(hdr->addr1))
1465 rx->local->dot11MulticastReceivedFrameCount++;
1466 else
1467 ieee80211_led_rx(rx->local);
9ae54c84 1468 return RX_CONTINUE;
571ecf67
JB		 1469}
1470
49461622 1471static ieee80211_rx_result debug_noinline
5cf121c3 1472ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1473{
af818581 1474 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1475 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1477
358c8d9d 1478 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1479 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1480 return RX_CONTINUE;
571ecf67 1481
05c914fe
JB		 1482 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1483 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1484 return RX_DROP_UNUSABLE;
98f0b0a3 1485
af818581
JB		 1486 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1487 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1488 else
1489 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1490
9ae54c84 1491 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1492 * count as an dropped frame. */
1493 dev_kfree_skb(rx->skb);
1494
9ae54c84 1495 return RX_QUEUED;
571ecf67
JB		 1496}
1497
49461622 1498static ieee80211_rx_result debug_noinline
5cf121c3 1499ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1500{
6e0d114d 1501 u8 *data = rx->skb->data;
238f74a2 1502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1503
238f74a2 1504 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1505 return RX_CONTINUE;
6e0d114d
JB		 1506
1507 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1508 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1509 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1510 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1511 /* change frame type to non QOS */
238f74a2 1512 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1513
9ae54c84 1514 return RX_CONTINUE;
6e0d114d
JB		 1515}
1516
76ee65bf 1517static int
5cf121c3 1518ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1519{
07346f81 1520 if (unlikely(!rx->sta ||
f4ea83dd 1521 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1522 return -EACCES;
571ecf67 1523
76ee65bf 1524 return 0;
571ecf67
JB		 1525}
1526
76ee65bf 1527static int
358c8d9d 1528ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1529{
eb9fb5b8
JB		 1530 struct sk_buff *skb = rx->skb;
1531 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1532
3017b80b 1533 /*
7848ba7d
JB		 1534 * Pass through unencrypted frames if the hardware has
1535 * decrypted them already.
3017b80b 1536 */
eb9fb5b8 1537 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1538 return 0;
571ecf67
JB		 1539
1540 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1541 if (unlikely(!ieee80211_has_protected(fc) &&
1542 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1543 ieee80211_is_data(fc) &&
b3fc9c6c 1544 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1545 return -EACCES;
bef5d1c7
JB		 1546
1547 return 0;
1548}
1549
1550static int
1551ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1552{
1553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1554 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1555 __le16 fc = hdr->frame_control;
bef5d1c7 1556
e3efca0a
JM		 1557 /*
1558 * Pass through unencrypted frames if the hardware has
1559 * decrypted them already.
1560 */
1561 if (status->flag & RX_FLAG_DECRYPTED)
1562 return 0;
bef5d1c7 1563
f2ca3ea4 1564 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1565 if (unlikely(!ieee80211_has_protected(fc) &&
1566 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1567 rx->key)) {
1568 if (ieee80211_is_deauth(fc))
1569 cfg80211_send_unprot_deauth(rx->sdata->dev,
1570 rx->skb->data,
1571 rx->skb->len);
1572 else if (ieee80211_is_disassoc(fc))
1573 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1574 rx->skb->data,
1575 rx->skb->len);
f2ca3ea4 1576 return -EACCES;
cf4e594e 1577 }
f2ca3ea4 1578 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1579 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1580 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
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
JM		 1591 /*
1592 * When using MFP, Action frames are not allowed prior to
1593 * having configured keys.
1594 */
1595 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1596 ieee80211_is_robust_mgmt_frame(
1597 (struct ieee80211_hdr *) rx->skb->data)))
1598 return -EACCES;
1599 }
b3fc9c6c 1600
76ee65bf 1601 return 0;
571ecf67
JB		 1602}
1603
76ee65bf 1604static int
4114fa21 1605__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1606{
eb9fb5b8 1607 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1608 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1609 bool check_port_control = false;
1610 struct ethhdr *ehdr;
1611 int ret;
f14543ee 1612
4114fa21 1613 *port_control = false;
9bc383de
JB		 1614 if (ieee80211_has_a4(hdr->frame_control) &&
1615 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1616 return -1;
9bc383de 1617
fbb327c5
FF		 1618 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1619 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1620
1621 if (!sdata->u.mgd.use_4addr)
1622 return -1;
1623 else
1624 check_port_control = true;
1625 }
1626
9bc383de 1627 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1628 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1629 return -1;
571ecf67 1630
fbb327c5 1631 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1632 if (ret < 0)
fbb327c5
FF		 1633 return ret;
1634
1635 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1636 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1637 *port_control = true;
1638 else if (check_port_control)
fbb327c5
FF		 1639 return -1;
1640
1641 return 0;
76ee65bf 1642}
571ecf67 1643
ce3edf6d
JB		 1644/*
1645 * requires that rx->skb is a frame with ethernet header
1646 */
358c8d9d 1647static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1648{
c97c23e3 1649 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1650 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1651 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1652
1653 /*
1654 * Allow EAPOL frames to us/the PAE group address regardless
1655 * of whether the frame was encrypted or not.
1656 */
a621fa4d 1657 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1658 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1659 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1660 return true;
1661
1662 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1663 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1664 return false;
1665
1666 return true;
1667}
1668
1669/*
1670 * requires that rx->skb is a frame with ethernet header
1671 */
76ee65bf 1672static void
5cf121c3 1673ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1674{
eb9fb5b8
JB		 1675 struct ieee80211_sub_if_data *sdata = rx->sdata;
1676 struct net_device *dev = sdata->dev;
76ee65bf 1677 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1678 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1679 struct sta_info *dsta;
554891e6 1680 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1681
76ee65bf
RR		 1682 skb = rx->skb;
1683 xmit_skb = NULL;
571ecf67 1684
05c914fe
JB		 1685 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1687 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1688 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1689 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1690 if (is_multicast_ether_addr(ehdr->h_dest)) {
1691 /*
1692 * send multicast frames both to higher layers in
1693 * local net stack and back to the wireless medium
1694 */
76ee65bf
RR		 1695 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1696 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1697 printk(KERN_DEBUG "%s: failed to clone "
1698 "multicast frame\n", dev->name);
1699 } else {
abe60632
JB		 1700 dsta = sta_info_get(sdata, skb->data);
1701 if (dsta) {
ce3edf6d
JB		 1702 /*
1703 * The destination station is associated to
1704 * this AP (in this VLAN), so send the frame
1705 * directly to it and do not pass it to local
1706 * net stack.
571ecf67 1707 */
76ee65bf 1708 xmit_skb = skb;
571ecf67
JB		 1709 skb = NULL;
1710 }
571ecf67
JB		 1711 }
1712 }
1713
1714 if (skb) {
d1c3a37c
JB		 1715 int align __maybe_unused;
1716
59d9cb07 1717#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1718 /*
1719 * 'align' will only take the values 0 or 2 here
1720 * since all frames are required to be aligned
1721 * to 2-byte boundaries when being passed to
1722 * mac80211. That also explains the __skb_push()
1723 * below.
1724 */
dacb6f1d 1725 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1726 if (align) {
1727 if (WARN_ON(skb_headroom(skb) < 3)) {
1728 dev_kfree_skb(skb);
1729 skb = NULL;
1730 } else {
1731 u8 *data = skb->data;
8ce0b589
ZY		 1732 size_t len = skb_headlen(skb);
1733 skb->data -= align;
1734 memmove(skb->data, data, len);
1735 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1736 }
1737 }
1738#endif
1739
1740 if (skb) {
1741 /* deliver to local stack */
1742 skb->protocol = eth_type_trans(skb, dev);
1743 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1744 netif_receive_skb(skb);
d1c3a37c 1745 }
571ecf67
JB		 1746 }
1747
76ee65bf 1748 if (xmit_skb) {
571ecf67 1749 /* send to wireless media */
f831e909 1750 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1751 skb_reset_network_header(xmit_skb);
1752 skb_reset_mac_header(xmit_skb);
76ee65bf 1753 dev_queue_xmit(xmit_skb);
571ecf67 1754 }
76ee65bf
RR		 1755}
1756
49461622 1757static ieee80211_rx_result debug_noinline
5cf121c3 1758ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1759{
eb9fb5b8 1760 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1761 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1763 __le16 fc = hdr->frame_control;
eaf85ca7 1764 struct sk_buff_head frame_list;
554891e6 1765 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1766
358c8d9d 1767 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1768 return RX_CONTINUE;
fd4c7f2f 1769
358c8d9d 1770 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1771 return RX_DROP_MONITOR;
fd4c7f2f 1772
554891e6 1773 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1774 return RX_CONTINUE;
fd4c7f2f 1775
eaf85ca7
ZY		 1776 if (ieee80211_has_a4(hdr->frame_control) &&
1777 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1778 !rx->sdata->u.vlan.sta)
e4c26add 1779 return RX_DROP_UNUSABLE;
fd4c7f2f 1780
eaf85ca7
ZY		 1781 if (is_multicast_ether_addr(hdr->addr1) &&
1782 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1783 rx->sdata->u.vlan.sta) ||
1784 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1785 rx->sdata->u.mgd.use_4addr)))
e4c26add 1786 return RX_DROP_UNUSABLE;
fd4c7f2f 1787
eaf85ca7
ZY		 1788 skb->dev = dev;
1789 __skb_queue_head_init(&frame_list);
fd4c7f2f 1790
e3cf8b3f
ZY		 1791 if (skb_linearize(skb))
1792 return RX_DROP_UNUSABLE;
1793
eaf85ca7
ZY		 1794 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1795 rx->sdata->vif.type,
8b3becad 1796 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1797
eaf85ca7
ZY		 1798 while (!skb_queue_empty(&frame_list)) {
1799 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1800
358c8d9d 1801 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1802 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1803 continue;
1804 }
eaf85ca7
ZY		 1805 dev->stats.rx_packets++;
1806 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1807
1808 ieee80211_deliver_skb(rx);
1809 }
1810
9ae54c84 1811 return RX_QUEUED;
fd4c7f2f
RR		 1812}
1813
bf94e17b 1814#ifdef CONFIG_MAC80211_MESH
b0dee578 1815static ieee80211_rx_result
e32f85f7
LCC		 1816ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1817{
1818 struct ieee80211_hdr *hdr;
1819 struct ieee80211s_hdr *mesh_hdr;
1820 unsigned int hdrlen;
1821 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1822 struct ieee80211_local *local = rx->local;
eb9fb5b8 1823 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1825
1826 hdr = (struct ieee80211_hdr *) skb->data;
1827 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1828 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1829
1830 if (!ieee80211_is_data(hdr->frame_control))
1831 return RX_CONTINUE;
1832
1833 if (!mesh_hdr->ttl)
1834 /* illegal frame */
1835 return RX_DROP_MONITOR;
1836
43b7b314 1837 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1838 struct mesh_path *mppath;
43b7b314
JC		 1839 char *proxied_addr;
1840 char *mpp_addr;
1841
1842 if (is_multicast_ether_addr(hdr->addr1)) {
1843 mpp_addr = hdr->addr3;
1844 proxied_addr = mesh_hdr->eaddr1;
1845 } else {
1846 mpp_addr = hdr->addr4;
1847 proxied_addr = mesh_hdr->eaddr2;
1848 }
79617dee 1849
79617dee 1850 rcu_read_lock();
43b7b314 1851 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1852 if (!mppath) {
43b7b314 1853 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1854 } else {
1855 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1856 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1857 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1858 spin_unlock_bh(&mppath->state_lock);
1859 }
1860 rcu_read_unlock();
1861 }
1862
3c5772a5
JC		 1863 /* Frame has reached destination. Don't forward */
1864 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1865 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1866 return RX_CONTINUE;
1867
1868 mesh_hdr->ttl--;
1869
554891e6 1870 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1871 if (!mesh_hdr->ttl)
472dbc45 1872 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1873 dropped_frames_ttl);
1874 else {
1875 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1876 struct ieee80211_tx_info *info;
1877
e32f85f7
LCC		 1878 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1879
1880 if (!fwd_skb && net_ratelimit())
1881 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1882 sdata->name);
919bbad5 1883 if (!fwd_skb)
b51aff05 1884 goto out;
e32f85f7
LCC		 1885
1886 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1887 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1888 info = IEEE80211_SKB_CB(fwd_skb);
1889 memset(info, 0, sizeof(*info));
1890 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1891 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1892 skb_set_queue_mapping(skb,
1893 ieee80211_select_queue(rx->sdata, fwd_skb));
1894 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1895 if (is_multicast_ether_addr(fwd_hdr->addr1))
1896 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1897 fwded_mcast);
1898 else {
3c5772a5
JC		 1899 int err;
1900 /*
1901 * Save TA to addr1 to send TA a path error if a
1902 * suitable next hop is not found
1903 */
1904 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1905 ETH_ALEN);
3c5772a5 1906 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1907 /* Failed to immediately resolve next hop:
1908 * fwded frame was dropped or will be added
1909 * later to the pending skb queue. */
1910 if (err)
1911 return RX_DROP_MONITOR;
c8a61a7d
DW		 1912
1913 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1914 fwded_unicast);
249b405c
JC		 1915 }
1916 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1917 fwded_frames);
3b8d81e0 1918 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1919 }
1920 }
1921
b51aff05 1922 out:
3c5772a5 1923 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1924 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1925 return RX_CONTINUE;
1926 else
1927 return RX_DROP_MONITOR;
1928}
bf94e17b 1929#endif
e32f85f7 1930
49461622 1931static ieee80211_rx_result debug_noinline
5cf121c3 1932ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1933{
eb9fb5b8 1934 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1935 struct ieee80211_local *local = rx->local;
eb9fb5b8 1936 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1937 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1938 __le16 fc = hdr->frame_control;
4114fa21 1939 bool port_control;
ce3edf6d 1940 int err;
76ee65bf 1941
358c8d9d 1942 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1943 return RX_CONTINUE;
76ee65bf 1944
358c8d9d 1945 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1946 return RX_DROP_MONITOR;
76ee65bf 1947
f14543ee
FF		 1948 /*
1949 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1950 * that a 4-addr station can be detected and moved into a separate VLAN
1951 */
1952 if (ieee80211_has_a4(hdr->frame_control) &&
1953 sdata->vif.type == NL80211_IFTYPE_AP)
1954 return RX_DROP_MONITOR;
1955
4114fa21 1956 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1957 if (unlikely(err))
e4c26add 1958 return RX_DROP_UNUSABLE;
76ee65bf 1959
358c8d9d 1960 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1961 return RX_DROP_MONITOR;
ce3edf6d 1962
4114fa21
FF		 1963 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1964 unlikely(port_control) && sdata->bss) {
1965 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1966 u.ap);
1967 dev = sdata->dev;
1968 rx->sdata = sdata;
1969 }
1970
76ee65bf
RR		 1971 rx->skb->dev = dev;
1972
1973 dev->stats.rx_packets++;
1974 dev->stats.rx_bytes += rx->skb->len;
1975
08ca944e 1976 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1977 !is_multicast_ether_addr(
1978 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1979 (!local->scanning &&
1980 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1981 mod_timer(&local->dynamic_ps_timer, jiffies +
1982 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1983 }
1984
76ee65bf 1985 ieee80211_deliver_skb(rx);
571ecf67 1986
9ae54c84 1987 return RX_QUEUED;
571ecf67
JB		 1988}
1989
49461622 1990static ieee80211_rx_result debug_noinline
24a8fdad 1991ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1992{
1993 struct ieee80211_local *local = rx->local;
1994 struct ieee80211_hw *hw = &local->hw;
1995 struct sk_buff *skb = rx->skb;
a7767f95 1996 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1997 struct tid_ampdu_rx *tid_agg_rx;
1998 u16 start_seq_num;
1999 u16 tid;
2000
a7767f95 2001 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2002 return RX_CONTINUE;
71364716 2003
a7767f95 2004 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2005 struct {
2006 __le16 control, start_seq_num;
2007 } __packed bar_data;
2008
71364716 2009 if (!rx->sta)
a02ae758 2010 return RX_DROP_MONITOR;
8ae5977f
JB		 2011
2012 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2013 &bar_data, sizeof(bar_data)))
2014 return RX_DROP_MONITOR;
2015
8ae5977f 2016 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2017
2018 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2019 if (!tid_agg_rx)
a02ae758 2020 return RX_DROP_MONITOR;
71364716 2021
8ae5977f 2022 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2023
2024 /* reset session timer */
20ad19d0
JB		 2025 if (tid_agg_rx->timeout)
2026 mod_timer(&tid_agg_rx->session_timer,
2027 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2028
dd318575 2029 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2030 /* release stored frames up to start of BAR */
24a8fdad 2031 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2032 spin_unlock(&tid_agg_rx->reorder_lock);
2033
a02ae758
JB		 2034 kfree_skb(skb);
2035 return RX_QUEUED;
71364716
RR		 2036 }
2037
08daecae
JB		 2038 /*
2039 * After this point, we only want management frames,
2040 * so we can drop all remaining control frames to
2041 * cooked monitor interfaces.
2042 */
2043 return RX_DROP_MONITOR;
71364716
RR		 2044}
2045
f4f727a6
JM		 2046static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2047 struct ieee80211_mgmt *mgmt,
2048 size_t len)
fea14732
JM		 2049{
2050 struct ieee80211_local *local = sdata->local;
2051 struct sk_buff *skb;
2052 struct ieee80211_mgmt *resp;
2053
47846c9b 2054 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2055 /* Not to own unicast address */
2056 return;
2057 }
2058
46900298
JB		 2059 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2060 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2061 /* Not from the current AP or not associated yet. */
fea14732
JM		 2062 return;
2063 }
2064
2065 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2066 /* Too short SA Query request frame */
2067 return;
2068 }
2069
2070 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2071 if (skb == NULL)
2072 return;
2073
2074 skb_reserve(skb, local->hw.extra_tx_headroom);
2075 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2076 memset(resp, 0, 24);
2077 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2078 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2079 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2080 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2081 IEEE80211_STYPE_ACTION);
2082 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2083 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2084 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2085 memcpy(resp->u.action.u.sa_query.trans_id,
2086 mgmt->u.action.u.sa_query.trans_id,
2087 WLAN_SA_QUERY_TR_ID_LEN);
2088
62ae67be 2089 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2090}
2091
2e161f78
JB		 2092static ieee80211_rx_result debug_noinline
2093ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2094{
2095 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2096 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2097
2098 /*
2099 * From here on, look only at management frames.
2100 * Data and control frames are already handled,
2101 * and unknown (reserved) frames are useless.
2102 */
2103 if (rx->skb->len < 24)
2104 return RX_DROP_MONITOR;
2105
2106 if (!ieee80211_is_mgmt(mgmt->frame_control))
2107 return RX_DROP_MONITOR;
2108
554891e6 2109 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2110 return RX_DROP_MONITOR;
2111
2112 if (ieee80211_drop_unencrypted_mgmt(rx))
2113 return RX_DROP_UNUSABLE;
2114
2115 return RX_CONTINUE;
2116}
2117
de1ede7a
JB		 2118static ieee80211_rx_result debug_noinline
2119ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2120{
2121 struct ieee80211_local *local = rx->local;
eb9fb5b8 2122 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2123 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2124 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2125 int len = rx->skb->len;
2126
2127 if (!ieee80211_is_action(mgmt->frame_control))
2128 return RX_CONTINUE;
2129
026331c4
JM		 2130 /* drop too small frames */
2131 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2132 return RX_DROP_UNUSABLE;
de1ede7a 2133
026331c4 2134 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2135 return RX_DROP_UNUSABLE;
de1ede7a 2136
554891e6 2137 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2138 return RX_DROP_UNUSABLE;
97ebe12a 2139
de1ede7a
JB		 2140 switch (mgmt->u.action.category) {
2141 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2142 /*
2143 * The aggregation code is not prepared to handle
2144 * anything but STA/AP due to the BSSID handling;
2145 * IBSS could work in the code but isn't supported
2146 * by drivers or the standard.
2147 */
2148 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2149 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2150 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2151 break;
8abd3f9b 2152
026331c4
JM		 2153 /* verify action_code is present */
2154 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2155 break;
2156
de1ede7a
JB		 2157 switch (mgmt->u.action.u.addba_req.action_code) {
2158 case WLAN_ACTION_ADDBA_REQ:
2159 if (len < (IEEE80211_MIN_ACTION_SIZE +
2160 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2161 goto invalid;
2162 break;
de1ede7a
JB		 2163 case WLAN_ACTION_ADDBA_RESP:
2164 if (len < (IEEE80211_MIN_ACTION_SIZE +
2165 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2166 goto invalid;
2167 break;
de1ede7a
JB		 2168 case WLAN_ACTION_DELBA:
2169 if (len < (IEEE80211_MIN_ACTION_SIZE +
2170 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2171 goto invalid;
2172 break;
2173 default:
2174 goto invalid;
de1ede7a 2175 }
bed7ee6e 2176
8b58ff83 2177 goto queue;
39192c0b
JB		 2178 case WLAN_CATEGORY_SPECTRUM_MGMT:
2179 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2180 break;
46900298
JB		 2181
2182 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2183 break;
46900298 2184
026331c4
JM		 2185 /* verify action_code is present */
2186 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2187 break;
2188
39192c0b
JB		 2189 switch (mgmt->u.action.u.measurement.action_code) {
2190 case WLAN_ACTION_SPCT_MSR_REQ:
2191 if (len < (IEEE80211_MIN_ACTION_SIZE +
2192 sizeof(mgmt->u.action.u.measurement)))
84040805 2193 break;
39192c0b 2194 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2195 goto handled;
c481ec97
S		 2196 case WLAN_ACTION_SPCT_CHL_SWITCH:
2197 if (len < (IEEE80211_MIN_ACTION_SIZE +
2198 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2199 break;
c481ec97 2200
cc32abd4 2201 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2202 break;
cc32abd4 2203
46900298 2204 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2205 break;
c481ec97 2206
8b58ff83 2207 goto queue;
39192c0b
JB		 2208 }
2209 break;
fea14732
JM		 2210 case WLAN_CATEGORY_SA_QUERY:
2211 if (len < (IEEE80211_MIN_ACTION_SIZE +
2212 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2213 break;
2214
fea14732
JM		 2215 switch (mgmt->u.action.u.sa_query.action) {
2216 case WLAN_ACTION_SA_QUERY_REQUEST:
2217 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2218 break;
fea14732 2219 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2220 goto handled;
fea14732
JM		 2221 }
2222 break;
8db09850
TP		 2223 case WLAN_CATEGORY_SELF_PROTECTED:
2224 switch (mgmt->u.action.u.self_prot.action_code) {
2225 case WLAN_SP_MESH_PEERING_OPEN:
2226 case WLAN_SP_MESH_PEERING_CLOSE:
2227 case WLAN_SP_MESH_PEERING_CONFIRM:
2228 if (!ieee80211_vif_is_mesh(&sdata->vif))
2229 goto invalid;
2230 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2231 /* userspace handles this frame */
2232 break;
2233 goto queue;
2234 case WLAN_SP_MGK_INFORM:
2235 case WLAN_SP_MGK_ACK:
2236 if (!ieee80211_vif_is_mesh(&sdata->vif))
2237 goto invalid;
2238 break;
2239 }
2240 break;
d3aaec8a 2241 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2242 if (!ieee80211_vif_is_mesh(&sdata->vif))
2243 break;
8b58ff83 2244 goto queue;
c7108a71
JC		 2245 case WLAN_CATEGORY_MESH_PATH_SEL:
2246 if (!mesh_path_sel_is_hwmp(sdata))
2247 break;
2248 goto queue;
84040805 2249 }
026331c4 2250
2e161f78
JB		 2251 return RX_CONTINUE;
2252
bed7ee6e 2253 invalid:
554891e6 2254 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2255 /* will return in the next handlers */
2256 return RX_CONTINUE;
2257
2258 handled:
2259 if (rx->sta)
2260 rx->sta->rx_packets++;
2261 dev_kfree_skb(rx->skb);
2262 return RX_QUEUED;
2263
2264 queue:
2265 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2266 skb_queue_tail(&sdata->skb_queue, rx->skb);
2267 ieee80211_queue_work(&local->hw, &sdata->work);
2268 if (rx->sta)
2269 rx->sta->rx_packets++;
2270 return RX_QUEUED;
2271}
2272
2273static ieee80211_rx_result debug_noinline
2274ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2275{
554891e6 2276 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2277
2278 /* skip known-bad action frames and return them in the next handler */
554891e6 2279 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2280 return RX_CONTINUE;
d7907448 2281
026331c4
JM		 2282 /*
2283 * Getting here means the kernel doesn't know how to handle
2284 * it, but maybe userspace does ... include returned frames
2285 * so userspace can register for those to know whether ones
2286 * it transmitted were processed or returned.
2287 */
026331c4 2288
2e161f78
JB		 2289 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2290 rx->skb->data, rx->skb->len,
2291 GFP_ATOMIC)) {
2292 if (rx->sta)
2293 rx->sta->rx_packets++;
2294 dev_kfree_skb(rx->skb);
2295 return RX_QUEUED;
2296 }
2297
2298
2299 return RX_CONTINUE;
2300}
2301
2302static ieee80211_rx_result debug_noinline
2303ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2304{
2305 struct ieee80211_local *local = rx->local;
2306 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2307 struct sk_buff *nskb;
2308 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2309 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2310
2311 if (!ieee80211_is_action(mgmt->frame_control))
2312 return RX_CONTINUE;
2313
2314 /*
2315 * For AP mode, hostapd is responsible for handling any action
2316 * frames that we didn't handle, including returning unknown
2317 * ones. For all other modes we will return them to the sender,
2318 * setting the 0x80 bit in the action category, as required by
2319 * 802.11-2007 7.3.1.11.
2320 * Newer versions of hostapd shall also use the management frame
2321 * registration mechanisms, but older ones still use cooked
2322 * monitor interfaces so push all frames there.
2323 */
554891e6 2324 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2325 (sdata->vif.type == NL80211_IFTYPE_AP ||
2326 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2327 return RX_DROP_MONITOR;
026331c4 2328
84040805
JB		 2329 /* do not return rejected action frames */
2330 if (mgmt->u.action.category & 0x80)
2331 return RX_DROP_UNUSABLE;
2332
2333 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2334 GFP_ATOMIC);
2335 if (nskb) {
292b4df6 2336 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2337
292b4df6
JL		 2338 nmgmt->u.action.category |= 0x80;
2339 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2340 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2341
2342 memset(nskb->cb, 0, sizeof(nskb->cb));
2343
2344 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2345 }
39192c0b
JB		 2346 dev_kfree_skb(rx->skb);
2347 return RX_QUEUED;
de1ede7a
JB		 2348}
2349
49461622 2350static ieee80211_rx_result debug_noinline
5cf121c3 2351ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2352{
eb9fb5b8 2353 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2354 ieee80211_rx_result rxs;
77a121c3
JB		 2355 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2356 __le16 stype;
571ecf67 2357
af6b6374
JB		 2358 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2359 if (rxs != RX_CONTINUE)
2360 return rxs;
2361
77a121c3 2362 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2363
77a121c3
JB		 2364 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2365 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2366 sdata->vif.type != NL80211_IFTYPE_STATION)
2367 return RX_DROP_MONITOR;
472dbc45 2368
77a121c3
JB		 2369 switch (stype) {
2370 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2371 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2372 /* process for all: mesh, mlme, ibss */
2373 break;
2374 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2375 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2376 if (is_multicast_ether_addr(mgmt->da) &&
2377 !is_broadcast_ether_addr(mgmt->da))
2378 return RX_DROP_MONITOR;
2379
77a121c3
JB		 2380 /* process only for station */
2381 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2382 return RX_DROP_MONITOR;
2383 break;
2384 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2385 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2386 /* process only for ibss */
2387 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2388 return RX_DROP_MONITOR;
2389 break;
2390 default:
2391 return RX_DROP_MONITOR;
2392 }
f9d540ee 2393
77a121c3 2394 /* queue up frame and kick off work to process it */
c1475ca9 2395 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2396 skb_queue_tail(&sdata->skb_queue, rx->skb);
2397 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2398 if (rx->sta)
2399 rx->sta->rx_packets++;
46900298 2400
77a121c3 2401 return RX_QUEUED;
571ecf67
JB		 2402}
2403
5cf121c3 2404/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2405static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2406 struct ieee80211_rate *rate)
3d30d949
MW		 2407{
2408 struct ieee80211_sub_if_data *sdata;
2409 struct ieee80211_local *local = rx->local;
2410 struct ieee80211_rtap_hdr {
2411 struct ieee80211_radiotap_header hdr;
2412 u8 flags;
5f0b7de5 2413 u8 rate_or_pad;
3d30d949
MW		 2414 __le16 chan_freq;
2415 __le16 chan_flags;
bc10502d 2416 } __packed *rthdr;
3d30d949
MW		 2417 struct sk_buff *skb = rx->skb, *skb2;
2418 struct net_device *prev_dev = NULL;
eb9fb5b8 2419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2420
554891e6
JB		 2421 /*
2422 * If cooked monitor has been processed already, then
2423 * don't do it again. If not, set the flag.
2424 */
2425 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2426 goto out_free_skb;
554891e6 2427 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2428
3d30d949
MW		 2429 if (skb_headroom(skb) < sizeof(*rthdr) &&
2430 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2431 goto out_free_skb;
2432
2433 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2434 memset(rthdr, 0, sizeof(*rthdr));
2435 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2436 rthdr->hdr.it_present =
2437 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2438 (1 << IEEE80211_RADIOTAP_CHANNEL));
2439
5f0b7de5
JB		 2440 if (rate) {
2441 rthdr->rate_or_pad = rate->bitrate / 5;
2442 rthdr->hdr.it_present |=
2443 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2444 }
3d30d949
MW		 2445 rthdr->chan_freq = cpu_to_le16(status->freq);
2446
2447 if (status->band == IEEE80211_BAND_5GHZ)
2448 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2449 IEEE80211_CHAN_5GHZ);
2450 else
2451 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2452 IEEE80211_CHAN_2GHZ);
2453
2454 skb_set_mac_header(skb, 0);
2455 skb->ip_summed = CHECKSUM_UNNECESSARY;
2456 skb->pkt_type = PACKET_OTHERHOST;
2457 skb->protocol = htons(ETH_P_802_2);
2458
2459 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2460 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2461 continue;
2462
05c914fe 2463 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2464 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2465 continue;
2466
2467 if (prev_dev) {
2468 skb2 = skb_clone(skb, GFP_ATOMIC);
2469 if (skb2) {
2470 skb2->dev = prev_dev;
5548a8a1 2471 netif_receive_skb(skb2);
3d30d949
MW		 2472 }
2473 }
2474
2475 prev_dev = sdata->dev;
2476 sdata->dev->stats.rx_packets++;
2477 sdata->dev->stats.rx_bytes += skb->len;
2478 }
2479
2480 if (prev_dev) {
2481 skb->dev = prev_dev;
5548a8a1 2482 netif_receive_skb(skb);
554891e6
JB		 2483 return;
2484 }
3d30d949
MW		 2485
2486 out_free_skb:
2487 dev_kfree_skb(skb);
2488}
2489
aa0c8636
CL		 2490static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2491 ieee80211_rx_result res)
2492{
2493 switch (res) {
2494 case RX_DROP_MONITOR:
2495 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2496 if (rx->sta)
2497 rx->sta->rx_dropped++;
2498 /* fall through */
2499 case RX_CONTINUE: {
2500 struct ieee80211_rate *rate = NULL;
2501 struct ieee80211_supported_band *sband;
2502 struct ieee80211_rx_status *status;
2503
2504 status = IEEE80211_SKB_RXCB((rx->skb));
2505
2506 sband = rx->local->hw.wiphy->bands[status->band];
2507 if (!(status->flag & RX_FLAG_HT))
2508 rate = &sband->bitrates[status->rate_idx];
2509
2510 ieee80211_rx_cooked_monitor(rx, rate);
2511 break;
2512 }
2513 case RX_DROP_UNUSABLE:
2514 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2515 if (rx->sta)
2516 rx->sta->rx_dropped++;
2517 dev_kfree_skb(rx->skb);
2518 break;
2519 case RX_QUEUED:
2520 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2521 break;
2522 }
2523}
571ecf67 2524
24a8fdad 2525static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2526{
58905290 2527 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2528 struct sk_buff *skb;
8944b79f 2529
e32f85f7
LCC		 2530#define CALL_RXH(rxh) \
2531 do { \
2532 res = rxh(rx); \
2533 if (res != RX_CONTINUE) \
2569a826 2534 goto rxh_next; \
e32f85f7 2535 } while (0);
49461622 2536
24a8fdad
CL		 2537 spin_lock(&rx->local->rx_skb_queue.lock);
2538 if (rx->local->running_rx_handler)
2539 goto unlock;
2540
2541 rx->local->running_rx_handler = true;
2542
2543 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2544 spin_unlock(&rx->local->rx_skb_queue.lock);
2545
2569a826
JB		 2546 /*
2547 * all the other fields are valid across frames
2548 * that belong to an aMPDU since they are on the
2549 * same TID from the same station
2550 */
2551 rx->skb = skb;
2552
2553 CALL_RXH(ieee80211_rx_h_decrypt)
2554 CALL_RXH(ieee80211_rx_h_check_more_data)
2555 CALL_RXH(ieee80211_rx_h_sta_process)
2556 CALL_RXH(ieee80211_rx_h_defragment)
2557 CALL_RXH(ieee80211_rx_h_ps_poll)
2558 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2559 /* must be after MMIC verify so header is counted in MPDU mic */
2560 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2561 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2562#ifdef CONFIG_MAC80211_MESH
aa0c8636 2563 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2564 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2565#endif
2569a826 2566 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2567 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2568 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2569 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2570 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2571 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2572 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2573
aa0c8636
CL		 2574 rxh_next:
2575 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2576 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2577#undef CALL_RXH
aa0c8636 2578 }
24a8fdad
CL		 2579
2580 rx->local->running_rx_handler = false;
2581
2582 unlock:
2583 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2584}
2585
4406c376 2586static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2587{
aa0c8636
CL		 2588 ieee80211_rx_result res = RX_DROP_MONITOR;
2589
aa0c8636
CL		 2590#define CALL_RXH(rxh) \
2591 do { \
2592 res = rxh(rx); \
2593 if (res != RX_CONTINUE) \
2594 goto rxh_next; \
2595 } while (0);
2596
2597 CALL_RXH(ieee80211_rx_h_passive_scan)
2598 CALL_RXH(ieee80211_rx_h_check)
2599
24a8fdad 2600 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2601
24a8fdad 2602 ieee80211_rx_handlers(rx);
aa0c8636 2603 return;
49461622 2604
2569a826 2605 rxh_next:
aa0c8636
CL		 2606 ieee80211_rx_handlers_result(rx, res);
2607
2608#undef CALL_RXH
58905290
JB		 2609}
2610
2bff8ebf 2611/*
dd318575
JB		 2612 * This function makes calls into the RX path, therefore
2613 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2614 */
2615void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2616{
554891e6
JB		 2617 struct ieee80211_rx_data rx = {
2618 .sta = sta,
2619 .sdata = sta->sdata,
2620 .local = sta->local,
9e26297a
JB		 2621 /* This is OK -- must be QoS data frame */
2622 .security_idx = tid,
2623 .seqno_idx = tid,
fcf8bd3b 2624 .flags = 0,
554891e6 2625 };
2c15a0cf
CL		 2626 struct tid_ampdu_rx *tid_agg_rx;
2627
2628 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2629 if (!tid_agg_rx)
2630 return;
2bff8ebf 2631
2c15a0cf 2632 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2633 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2634 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2635
24a8fdad 2636 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2637}
2638
571ecf67
JB		 2639/* main receive path */
2640
20b01f80 2641static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2642 struct ieee80211_hdr *hdr)
2643{
20b01f80 2644 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2645 struct sk_buff *skb = rx->skb;
2646 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2647 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2648 int multicast = is_multicast_ether_addr(hdr->addr1);
2649
51fb61e7 2650 switch (sdata->vif.type) {
05c914fe 2651 case NL80211_IFTYPE_STATION:
9bc383de 2652 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2653 return 0;
77fdaa12 2654 if (!multicast &&
47846c9b 2655 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2656 if (!(sdata->dev->flags & IFF_PROMISC) ||
2657 sdata->u.mgd.use_4addr)
23a24def 2658 return 0;
554891e6 2659 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2660 }
2661 break;
05c914fe 2662 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2663 if (!bssid)
2664 return 0;
a7767f95 2665 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2666 return 1;
87291c02 2667 }
46900298 2668 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2669 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2670 return 0;
554891e6 2671 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2672 } else if (!multicast &&
47846c9b 2673 compare_ether_addr(sdata->vif.addr,
23a24def 2674 hdr->addr1) != 0) {
4150c572 2675 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2676 return 0;
554891e6 2677 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2678 } else if (!rx->sta) {
2679 int rate_idx;
eb9fb5b8 2680 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2681 rate_idx = 0; /* TODO: HT rates */
2682 else
eb9fb5b8 2683 rate_idx = status->rate_idx;
34e89507
JB		 2684 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2685 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2686 }
23a24def 2687 break;
05c914fe 2688 case NL80211_IFTYPE_MESH_POINT:
6032f934 2689 if (!multicast &&
47846c9b 2690 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2691 hdr->addr1) != 0) {
2692 if (!(sdata->dev->flags & IFF_PROMISC))
2693 return 0;
2694
554891e6 2695 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2696 }
2697 break;
05c914fe
JB		 2698 case NL80211_IFTYPE_AP_VLAN:
2699 case NL80211_IFTYPE_AP:
23a24def 2700 if (!bssid) {
47846c9b 2701 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2702 hdr->addr1))
2703 return 0;
2704 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2705 sdata->vif.addr)) {
771bbd09
AN		 2706 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2707 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2708 return 0;
554891e6 2709 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2710 }
23a24def 2711 break;
05c914fe 2712 case NL80211_IFTYPE_WDS:
a7767f95 2713 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2714 return 0;
2715 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2716 return 0;
2717 break;
2ca27bcf 2718 default:
fb1c1cd6
JB		 2719 /* should never get here */
2720 WARN_ON(1);
2721 break;
23a24def
JB		 2722 }
2723
2724 return 1;
2725}
2726
4406c376
JB		 2727/*
2728 * This function returns whether or not the SKB
2729 * was destined for RX processing or not, which,
2730 * if consume is true, is equivalent to whether
2731 * or not the skb was consumed.
2732 */
2733static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2734 struct sk_buff *skb, bool consume)
2735{
2736 struct ieee80211_local *local = rx->local;
2737 struct ieee80211_sub_if_data *sdata = rx->sdata;
2738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2739 struct ieee80211_hdr *hdr = (void *)skb->data;
2740 int prepares;
2741
2742 rx->skb = skb;
554891e6 2743 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2744 prepares = prepare_for_handlers(rx, hdr);
2745
2746 if (!prepares)
2747 return false;
2748
4406c376
JB		 2749 if (!consume) {
2750 skb = skb_copy(skb, GFP_ATOMIC);
2751 if (!skb) {
2752 if (net_ratelimit())
2753 wiphy_debug(local->hw.wiphy,
b305dae4 2754 "failed to copy skb for %s\n",
4406c376
JB		 2755 sdata->name);
2756 return true;
2757 }
2758
2759 rx->skb = skb;
2760 }
2761
2762 ieee80211_invoke_rx_handlers(rx);
2763 return true;
2764}
2765
571ecf67 2766/*
6368e4b1
RR		 2767 * This is the actual Rx frames handler. as it blongs to Rx path it must
2768 * be called with rcu_read_lock protection.
571ecf67 2769 */
71ebb4aa 2770static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2771 struct sk_buff *skb)
571ecf67 2772{
554891e6 2773 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2774 struct ieee80211_local *local = hw_to_local(hw);
2775 struct ieee80211_sub_if_data *sdata;
571ecf67 2776 struct ieee80211_hdr *hdr;
e3cf8b3f 2777 __le16 fc;
5cf121c3 2778 struct ieee80211_rx_data rx;
4406c376 2779 struct ieee80211_sub_if_data *prev;
56af3268 2780 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2781 int err = 0;
571ecf67 2782
e3cf8b3f 2783 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2784 memset(&rx, 0, sizeof(rx));
2785 rx.skb = skb;
2786 rx.local = local;
72abd81b 2787
e3cf8b3f 2788 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2789 local->dot11ReceivedFragmentCount++;
571ecf67 2790
142b9f50 2791 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2792 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2793 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2794
e3cf8b3f
ZY		 2795 if (ieee80211_is_mgmt(fc))
2796 err = skb_linearize(skb);
2797 else
2798 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2799
2800 if (err) {
2801 dev_kfree_skb(skb);
2802 return;
2803 }
2804
2805 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2806 ieee80211_parse_qos(&rx);
d1c3a37c 2807 ieee80211_verify_alignment(&rx);
38f3714d 2808
e3cf8b3f 2809 if (ieee80211_is_data(fc)) {
56af3268 2810 prev_sta = NULL;
4406c376 2811
abe60632 2812 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2813 if (!prev_sta) {
2814 prev_sta = sta;
2815 continue;
2816 }
2817
2818 rx.sta = prev_sta;
2819 rx.sdata = prev_sta->sdata;
4406c376 2820 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2821
56af3268 2822 prev_sta = sta;
4406c376 2823 }
56af3268
BG		 2824
2825 if (prev_sta) {
2826 rx.sta = prev_sta;
2827 rx.sdata = prev_sta->sdata;
2828
4406c376 2829 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2830 return;
8e26d5ad 2831 goto out;
56af3268 2832 }
4406c376
JB		 2833 }
2834
4b0dd98e 2835 prev = NULL;
b2e7771e 2836
4b0dd98e
JB		 2837 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2838 if (!ieee80211_sdata_running(sdata))
2839 continue;
340e11f3 2840
4b0dd98e
JB		 2841 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2842 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2843 continue;
340e11f3 2844
4b0dd98e
JB		 2845 /*
2846 * frame is destined for this interface, but if it's
2847 * not also for the previous one we handle that after
2848 * the loop to avoid copying the SKB once too much
2849 */
4bb29f8c 2850
4b0dd98e 2851 if (!prev) {
abe60632 2852 prev = sdata;
4b0dd98e 2853 continue;
340e11f3 2854 }
4bb29f8c 2855
4b0dd98e
JB		 2856 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2857 rx.sdata = prev;
2858 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2859
4b0dd98e
JB		 2860 prev = sdata;
2861 }
2862
2863 if (prev) {
2864 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2865 rx.sdata = prev;
4406c376 2866
4b0dd98e
JB		 2867 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2868 return;
571ecf67 2869 }
4406c376 2870
8e26d5ad 2871 out:
4406c376 2872 dev_kfree_skb(skb);
571ecf67 2873}
6368e4b1
RR		 2874
2875/*
2876 * This is the receive path handler. It is called by a low level driver when an
2877 * 802.11 MPDU is received from the hardware.
2878 */
103bf9f7 2879void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2880{
2881 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2882 struct ieee80211_rate *rate = NULL;
2883 struct ieee80211_supported_band *sband;
f1d58c25 2884 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2885
d20ef63d
JB		 2886 WARN_ON_ONCE(softirq_count() == 0);
2887
77a980dc
JB		 2888 if (WARN_ON(status->band < 0 ||
2889 status->band >= IEEE80211_NUM_BANDS))
2890 goto drop;
8318d78a
JB		 2891
2892 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2893 if (WARN_ON(!sband))
2894 goto drop;
8318d78a 2895
89c3a8ac
JB		 2896 /*
2897 * If we're suspending, it is possible although not too likely
2898 * that we'd be receiving frames after having already partially
2899 * quiesced the stack. We can't process such frames then since
2900 * that might, for example, cause stations to be added or other
2901 * driver callbacks be invoked.
2902 */
77a980dc
JB		 2903 if (unlikely(local->quiescing || local->suspended))
2904 goto drop;
89c3a8ac 2905
ea77f12f
JB		 2906 /*
2907 * The same happens when we're not even started,
2908 * but that's worth a warning.
2909 */
77a980dc
JB		 2910 if (WARN_ON(!local->started))
2911 goto drop;
ea77f12f 2912
fc885189 2913 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2914 /*
fc885189
JB		 2915 * Validate the rate, unless a PLCP error means that
2916 * we probably can't have a valid rate here anyway.
e5d6eb83 2917 */
fc885189
JB		 2918
2919 if (status->flag & RX_FLAG_HT) {
2920 /*
2921 * rate_idx is MCS index, which can be [0-76]
2922 * as documented on:
2923 *
2924 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2925 *
2926 * Anything else would be some sort of driver or
2927 * hardware error. The driver should catch hardware
2928 * errors.
2929 */
2930 if (WARN((status->rate_idx < 0 ||
2931 status->rate_idx > 76),
2932 "Rate marked as an HT rate but passed "
2933 "status->rate_idx is not "
2934 "an MCS index [0-76]: %d (0x%02x)\n",
2935 status->rate_idx,
2936 status->rate_idx))
2937 goto drop;
2938 } else {
2939 if (WARN_ON(status->rate_idx < 0 ||
2940 status->rate_idx >= sband->n_bitrates))
2941 goto drop;
2942 rate = &sband->bitrates[status->rate_idx];
2943 }
0fb8ca45 2944 }
6368e4b1 2945
554891e6
JB		 2946 status->rx_flags = 0;
2947
6368e4b1
RR		 2948 /*
2949 * key references and virtual interfaces are protected using RCU
2950 * and this requires that we are in a read-side RCU section during
2951 * receive processing
2952 */
2953 rcu_read_lock();
2954
2955 /*
2956 * Frames with failed FCS/PLCP checksum are not returned,
2957 * all other frames are returned without radiotap header
2958 * if it was previously present.
2959 * Also, frames with less than 16 bytes are dropped.
2960 */
f1d58c25 2961 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2962 if (!skb) {
2963 rcu_read_unlock();
2964 return;
2965 }
2966
e1e54068
JB		 2967 ieee80211_tpt_led_trig_rx(local,
2968 ((struct ieee80211_hdr *)skb->data)->frame_control,
2969 skb->len);
071d9ac2 2970 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2971
2972 rcu_read_unlock();
77a980dc
JB		 2973
2974 return;
2975 drop:
2976 kfree_skb(skb);
6368e4b1 2977}
103bf9f7 2978EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2979
2980/* This is a version of the rx handler that can be called from hard irq
2981 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2982void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2983{
2984 struct ieee80211_local *local = hw_to_local(hw);
2985
2986 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2987
571ecf67
JB		 2988 skb->pkt_type = IEEE80211_RX_MSG;
2989 skb_queue_tail(&local->skb_queue, skb);
2990 tasklet_schedule(&local->tasklet);
2991}
2992EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)