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mac80211: remove a redundant check
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
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) {
571ecf67 1022 rx->key->tx_rx_count++;
011bfcc4 1023 /* TODO: add threshold stuff again */
1990af8d 1024 } else {
e4c26add 1025 return RX_DROP_MONITOR;
70f08765
JB		 1026 }
1027
39184b15
ZY		 1028 if (skb_linearize(rx->skb))
1029 return RX_DROP_UNUSABLE;
761ab470 1030 /* the hdr variable is invalid now! */
1990af8d 1031
97359d12
JB		 1032 switch (rx->key->conf.cipher) {
1033 case WLAN_CIPHER_SUITE_WEP40:
1034 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1035 /* Check for weak IVs if possible */
1036 if (rx->sta && ieee80211_is_data(fc) &&
1037 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1038 !(status->flag & RX_FLAG_DECRYPTED)) &&
1039 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1040 rx->sta->wep_weak_iv_count++;
1041
e2f036da
MN		 1042 result = ieee80211_crypto_wep_decrypt(rx);
1043 break;
97359d12 1044 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1045 result = ieee80211_crypto_tkip_decrypt(rx);
1046 break;
97359d12 1047 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1048 result = ieee80211_crypto_ccmp_decrypt(rx);
1049 break;
97359d12 1050 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1051 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1052 break;
3ffc2a90
JB		 1053 default:
1054 /*
1055 * We can reach here only with HW-only algorithms
1056 * but why didn't it decrypt the frame?!
1057 */
1058 return RX_DROP_UNUSABLE;
70f08765
JB		 1059 }
1060
e2f036da 1061 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1062 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1063
1064 return result;
70f08765
JB		 1065}
1066
572e0012
KV		 1067static ieee80211_rx_result debug_noinline
1068ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1069{
1070 struct ieee80211_local *local;
1071 struct ieee80211_hdr *hdr;
1072 struct sk_buff *skb;
1073
1074 local = rx->local;
1075 skb = rx->skb;
1076 hdr = (struct ieee80211_hdr *) skb->data;
1077
1078 if (!local->pspolling)
1079 return RX_CONTINUE;
1080
1081 if (!ieee80211_has_fromds(hdr->frame_control))
1082 /* this is not from AP */
1083 return RX_CONTINUE;
1084
1085 if (!ieee80211_is_data(hdr->frame_control))
1086 return RX_CONTINUE;
1087
1088 if (!ieee80211_has_moredata(hdr->frame_control)) {
1089 /* AP has no more frames buffered for us */
1090 local->pspolling = false;
1091 return RX_CONTINUE;
1092 }
1093
1094 /* more data bit is set, let's request a new frame from the AP */
1095 ieee80211_send_pspoll(local, rx->sdata);
1096
1097 return RX_CONTINUE;
1098}
1099
133b8226 1100static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1101{
133b8226 1102 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1103 struct ieee80211_local *local = sdata->local;
0795af57 1104
3e122be0 1105 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1106 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1107 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1108 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1109#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1110 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1111 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1112#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1113}
1114
ff9458d3 1115static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1116{
133b8226 1117 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1118
3e122be0 1119 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1120
571ecf67 1121#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1122 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1123 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1124#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1125
af818581 1126 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1127#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1128 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1129 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1130#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1131 return;
1132 }
1133
1134 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1135}
1136
d057e5a3
AN		 1137int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1138{
1139 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1140 bool in_ps;
1141
1142 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1143
1144 /* Don't let the same PS state be set twice */
1145 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1146 if ((start && in_ps) || (!start && !in_ps))
1147 return -EINVAL;
1148
1149 if (start)
1150 ap_sta_ps_start(sta_inf);
1151 else
1152 ap_sta_ps_end(sta_inf);
1153
1154 return 0;
1155}
1156EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1157
49461622 1158static ieee80211_rx_result debug_noinline
5cf121c3 1159ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1160{
1161 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1162 struct sk_buff *skb = rx->skb;
1163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1164 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1165
1166 if (!sta)
9ae54c84 1167 return RX_CONTINUE;
571ecf67 1168
b291ba11
JB		 1169 /*
1170 * Update last_rx only for IBSS packets which are for the current
1171 * BSSID to avoid keeping the current IBSS network alive in cases
1172 * where other STAs start using different BSSID.
1173 */
05c914fe 1174 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1175 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1176 NL80211_IFTYPE_ADHOC);
3af6334c 1177 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1178 sta->last_rx = jiffies;
3af6334c
FF		 1179 if (ieee80211_is_data(hdr->frame_control)) {
1180 sta->last_rx_rate_idx = status->rate_idx;
1181 sta->last_rx_rate_flag = status->flag;
1182 }
1183 }
b291ba11
JB		 1184 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1185 /*
33b64eb2
LCC		 1186 * Mesh beacons will update last_rx when if they are found to
1187 * match the current local configuration when processed.
571ecf67 1188 */
b291ba11 1189 sta->last_rx = jiffies;
3af6334c
FF		 1190 if (ieee80211_is_data(hdr->frame_control)) {
1191 sta->last_rx_rate_idx = status->rate_idx;
1192 sta->last_rx_rate_flag = status->flag;
1193 }
571ecf67
JB		 1194 }
1195
554891e6 1196 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1197 return RX_CONTINUE;
571ecf67 1198
3cf335d5
KV		 1199 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1200 ieee80211_sta_rx_notify(rx->sdata, hdr);
1201
571ecf67
JB		 1202 sta->rx_fragments++;
1203 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1204 sta->last_signal = status->signal;
541a45a1 1205 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1206
72eaa43a
JB		 1207 /*
1208 * Change STA power saving mode only at the end of a frame
1209 * exchange sequence.
1210 */
d057e5a3
AN		 1211 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1212 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1213 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1214 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1215 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1216 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1217 /*
1218 * Ignore doze->wake transitions that are
1219 * indicated by non-data frames, the standard
1220 * is unclear here, but for example going to
1221 * PS mode and then scanning would cause a
1222 * doze->wake transition for the probe request,
1223 * and that is clearly undesirable.
1224 */
1225 if (ieee80211_is_data(hdr->frame_control) &&
1226 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1227 ap_sta_ps_end(sta);
72eaa43a
JB		 1228 } else {
1229 if (ieee80211_has_pm(hdr->frame_control))
1230 ap_sta_ps_start(sta);
1231 }
571ecf67
JB		 1232 }
1233
22403def
JB		 1234 /*
1235 * Drop (qos-)data::nullfunc frames silently, since they
1236 * are used only to control station power saving mode.
1237 */
1238 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1239 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1240 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1241
1242 /*
1243 * If we receive a 4-addr nullfunc frame from a STA
1244 * that was not moved to a 4-addr STA vlan yet, drop
1245 * the frame to the monitor interface, to make sure
1246 * that hostapd sees it
1247 */
1248 if (ieee80211_has_a4(hdr->frame_control) &&
1249 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1250 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1251 !rx->sdata->u.vlan.sta)))
1252 return RX_DROP_MONITOR;
22403def
JB		 1253 /*
1254 * Update counter and free packet here to avoid
1255 * counting this as a dropped packed.
1256 */
571ecf67
JB		 1257 sta->rx_packets++;
1258 dev_kfree_skb(rx->skb);
9ae54c84 1259 return RX_QUEUED;
571ecf67
JB		 1260 }
1261
9ae54c84 1262 return RX_CONTINUE;
571ecf67
JB		 1263} /* ieee80211_rx_h_sta_process */
1264
571ecf67
JB		 1265static inline struct ieee80211_fragment_entry *
1266ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1267 unsigned int frag, unsigned int seq, int rx_queue,
1268 struct sk_buff **skb)
1269{
1270 struct ieee80211_fragment_entry *entry;
1271 int idx;
1272
1273 idx = sdata->fragment_next;
1274 entry = &sdata->fragments[sdata->fragment_next++];
1275 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1276 sdata->fragment_next = 0;
1277
1278 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1279#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1280 struct ieee80211_hdr *hdr =
1281 (struct ieee80211_hdr *) entry->skb_list.next->data;
1282 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1283 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1284 "addr1=%pM addr2=%pM\n",
47846c9b 1285 sdata->name, idx,
571ecf67 1286 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1287 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1288#endif
571ecf67
JB		 1289 __skb_queue_purge(&entry->skb_list);
1290 }
1291
1292 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1293 *skb = NULL;
1294 entry->first_frag_time = jiffies;
1295 entry->seq = seq;
1296 entry->rx_queue = rx_queue;
1297 entry->last_frag = frag;
1298 entry->ccmp = 0;
1299 entry->extra_len = 0;
1300
1301 return entry;
1302}
1303
1304static inline struct ieee80211_fragment_entry *
1305ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1306 unsigned int frag, unsigned int seq,
571ecf67
JB		 1307 int rx_queue, struct ieee80211_hdr *hdr)
1308{
1309 struct ieee80211_fragment_entry *entry;
1310 int i, idx;
1311
1312 idx = sdata->fragment_next;
1313 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1314 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1315
1316 idx--;
1317 if (idx < 0)
1318 idx = IEEE80211_FRAGMENT_MAX - 1;
1319
1320 entry = &sdata->fragments[idx];
1321 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1322 entry->rx_queue != rx_queue ||
1323 entry->last_frag + 1 != frag)
1324 continue;
1325
b73d70ad 1326 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1327
b73d70ad
HH		 1328 /*
1329 * Check ftype and addresses are equal, else check next fragment
1330 */
1331 if (((hdr->frame_control ^ f_hdr->frame_control) &
1332 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1333 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1334 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1335 continue;
1336
ab46623e 1337 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1338 __skb_queue_purge(&entry->skb_list);
1339 continue;
1340 }
1341 return entry;
1342 }
1343
1344 return NULL;
1345}
1346
49461622 1347static ieee80211_rx_result debug_noinline
5cf121c3 1348ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1349{
1350 struct ieee80211_hdr *hdr;
1351 u16 sc;
358c8d9d 1352 __le16 fc;
571ecf67
JB		 1353 unsigned int frag, seq;
1354 struct ieee80211_fragment_entry *entry;
1355 struct sk_buff *skb;
554891e6 1356 struct ieee80211_rx_status *status;
571ecf67 1357
b73d70ad 1358 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1359 fc = hdr->frame_control;
571ecf67
JB		 1360 sc = le16_to_cpu(hdr->seq_ctrl);
1361 frag = sc & IEEE80211_SCTL_FRAG;
1362
358c8d9d 1363 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1364 (rx->skb)->len < 24 ||
1365 is_multicast_ether_addr(hdr->addr1))) {
1366 /* not fragmented */
1367 goto out;
1368 }
1369 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1370
e3cf8b3f
ZY		 1371 if (skb_linearize(rx->skb))
1372 return RX_DROP_UNUSABLE;
1373
058897a4
AK		 1374 /*
1375 * skb_linearize() might change the skb->data and
1376 * previously cached variables (in this case, hdr) need to
1377 * be refreshed with the new data.
1378 */
1379 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1380 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1381
1382 if (frag == 0) {
1383 /* This is the first fragment of a new frame. */
1384 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1385 rx->seqno_idx, &(rx->skb));
97359d12 1386 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1387 ieee80211_has_protected(fc)) {
9e26297a 1388 int queue = rx->security_idx;
571ecf67
JB		 1389 /* Store CCMP PN so that we can verify that the next
1390 * fragment has a sequential PN value. */
1391 entry->ccmp = 1;
1392 memcpy(entry->last_pn,
9190252c 1393 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1394 CCMP_PN_LEN);
1395 }
9ae54c84 1396 return RX_QUEUED;
571ecf67
JB		 1397 }
1398
1399 /* This is a fragment for a frame that should already be pending in
1400 * fragment cache. Add this fragment to the end of the pending entry.
1401 */
9e26297a
JB		 1402 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1403 rx->seqno_idx, hdr);
571ecf67
JB		 1404 if (!entry) {
1405 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1406 return RX_DROP_MONITOR;
571ecf67
JB		 1407 }
1408
1409 /* Verify that MPDUs within one MSDU have sequential PN values.
1410 * (IEEE 802.11i, 8.3.3.4.5) */
1411 if (entry->ccmp) {
1412 int i;
1413 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1414 int queue;
97359d12 1415 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1416 return RX_DROP_UNUSABLE;
571ecf67
JB		 1417 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1418 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1419 pn[i]++;
1420 if (pn[i])
1421 break;
1422 }
9e26297a 1423 queue = rx->security_idx;
9190252c 1424 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1425 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1426 return RX_DROP_UNUSABLE;
571ecf67
JB		 1427 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1428 }
1429
358c8d9d 1430 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1431 __skb_queue_tail(&entry->skb_list, rx->skb);
1432 entry->last_frag = frag;
1433 entry->extra_len += rx->skb->len;
358c8d9d 1434 if (ieee80211_has_morefrags(fc)) {
571ecf67 1435 rx->skb = NULL;
9ae54c84 1436 return RX_QUEUED;
571ecf67
JB		 1437 }
1438
1439 rx->skb = __skb_dequeue(&entry->skb_list);
1440 if (skb_tailroom(rx->skb) < entry->extra_len) {
1441 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1442 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1443 GFP_ATOMIC))) {
1444 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1445 __skb_queue_purge(&entry->skb_list);
e4c26add 1446 return RX_DROP_UNUSABLE;
571ecf67
JB		 1447 }
1448 }
1449 while ((skb = __skb_dequeue(&entry->skb_list))) {
1450 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1451 dev_kfree_skb(skb);
1452 }
1453
1454 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1455 status = IEEE80211_SKB_RXCB(rx->skb);
1456 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1457
1458 out:
1459 if (rx->sta)
1460 rx->sta->rx_packets++;
1461 if (is_multicast_ether_addr(hdr->addr1))
1462 rx->local->dot11MulticastReceivedFrameCount++;
1463 else
1464 ieee80211_led_rx(rx->local);
9ae54c84 1465 return RX_CONTINUE;
571ecf67
JB		 1466}
1467
49461622 1468static ieee80211_rx_result debug_noinline
5cf121c3 1469ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1470{
af818581 1471 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1472 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1473 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1474
358c8d9d 1475 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1476 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1477 return RX_CONTINUE;
571ecf67 1478
05c914fe
JB		 1479 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1480 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1481 return RX_DROP_UNUSABLE;
98f0b0a3 1482
af818581
JB		 1483 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1484 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1485 else
1486 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1487
9ae54c84 1488 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1489 * count as an dropped frame. */
1490 dev_kfree_skb(rx->skb);
1491
9ae54c84 1492 return RX_QUEUED;
571ecf67
JB		 1493}
1494
49461622 1495static ieee80211_rx_result debug_noinline
5cf121c3 1496ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1497{
6e0d114d 1498 u8 *data = rx->skb->data;
238f74a2 1499 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1500
238f74a2 1501 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1502 return RX_CONTINUE;
6e0d114d
JB		 1503
1504 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1505 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1506 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1507 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1508 /* change frame type to non QOS */
238f74a2 1509 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1510
9ae54c84 1511 return RX_CONTINUE;
6e0d114d
JB		 1512}
1513
76ee65bf 1514static int
5cf121c3 1515ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1516{
07346f81 1517 if (unlikely(!rx->sta ||
f4ea83dd 1518 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1519 return -EACCES;
571ecf67 1520
76ee65bf 1521 return 0;
571ecf67
JB		 1522}
1523
76ee65bf 1524static int
358c8d9d 1525ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1526{
eb9fb5b8
JB		 1527 struct sk_buff *skb = rx->skb;
1528 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1529
3017b80b 1530 /*
7848ba7d
JB		 1531 * Pass through unencrypted frames if the hardware has
1532 * decrypted them already.
3017b80b 1533 */
eb9fb5b8 1534 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1535 return 0;
571ecf67
JB		 1536
1537 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1538 if (unlikely(!ieee80211_has_protected(fc) &&
1539 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1540 ieee80211_is_data(fc) &&
b3fc9c6c 1541 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1542 return -EACCES;
bef5d1c7
JB		 1543
1544 return 0;
1545}
1546
1547static int
1548ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1549{
1550 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1551 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1552 __le16 fc = hdr->frame_control;
bef5d1c7 1553
e3efca0a
JM		 1554 /*
1555 * Pass through unencrypted frames if the hardware has
1556 * decrypted them already.
1557 */
1558 if (status->flag & RX_FLAG_DECRYPTED)
1559 return 0;
bef5d1c7 1560
f2ca3ea4 1561 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1562 if (unlikely(!ieee80211_has_protected(fc) &&
1563 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1564 rx->key)) {
1565 if (ieee80211_is_deauth(fc))
1566 cfg80211_send_unprot_deauth(rx->sdata->dev,
1567 rx->skb->data,
1568 rx->skb->len);
1569 else if (ieee80211_is_disassoc(fc))
1570 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1571 rx->skb->data,
1572 rx->skb->len);
f2ca3ea4 1573 return -EACCES;
cf4e594e 1574 }
f2ca3ea4 1575 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1576 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1577 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1578 if (ieee80211_is_deauth(fc))
1579 cfg80211_send_unprot_deauth(rx->sdata->dev,
1580 rx->skb->data,
1581 rx->skb->len);
1582 else if (ieee80211_is_disassoc(fc))
1583 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1584 rx->skb->data,
1585 rx->skb->len);
f2ca3ea4 1586 return -EACCES;
cf4e594e 1587 }
f2ca3ea4
JM		 1588 /*
1589 * When using MFP, Action frames are not allowed prior to
1590 * having configured keys.
1591 */
1592 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1593 ieee80211_is_robust_mgmt_frame(
1594 (struct ieee80211_hdr *) rx->skb->data)))
1595 return -EACCES;
1596 }
b3fc9c6c 1597
76ee65bf 1598 return 0;
571ecf67
JB		 1599}
1600
76ee65bf 1601static int
4114fa21 1602__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1603{
eb9fb5b8 1604 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1605 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1606 bool check_port_control = false;
1607 struct ethhdr *ehdr;
1608 int ret;
f14543ee 1609
4114fa21 1610 *port_control = false;
9bc383de
JB		 1611 if (ieee80211_has_a4(hdr->frame_control) &&
1612 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1613 return -1;
9bc383de 1614
fbb327c5
FF		 1615 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1616 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1617
1618 if (!sdata->u.mgd.use_4addr)
1619 return -1;
1620 else
1621 check_port_control = true;
1622 }
1623
9bc383de 1624 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1625 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1626 return -1;
571ecf67 1627
fbb327c5 1628 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1629 if (ret < 0)
fbb327c5
FF		 1630 return ret;
1631
1632 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1633 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1634 *port_control = true;
1635 else if (check_port_control)
fbb327c5
FF		 1636 return -1;
1637
1638 return 0;
76ee65bf 1639}
571ecf67 1640
ce3edf6d
JB		 1641/*
1642 * requires that rx->skb is a frame with ethernet header
1643 */
358c8d9d 1644static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1645{
c97c23e3 1646 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1647 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1648 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1649
1650 /*
1651 * Allow EAPOL frames to us/the PAE group address regardless
1652 * of whether the frame was encrypted or not.
1653 */
a621fa4d 1654 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1655 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1656 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1657 return true;
1658
1659 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1660 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1661 return false;
1662
1663 return true;
1664}
1665
1666/*
1667 * requires that rx->skb is a frame with ethernet header
1668 */
76ee65bf 1669static void
5cf121c3 1670ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1671{
eb9fb5b8
JB		 1672 struct ieee80211_sub_if_data *sdata = rx->sdata;
1673 struct net_device *dev = sdata->dev;
76ee65bf 1674 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1675 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1676 struct sta_info *dsta;
554891e6 1677 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1678
76ee65bf
RR		 1679 skb = rx->skb;
1680 xmit_skb = NULL;
571ecf67 1681
05c914fe
JB		 1682 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1683 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1684 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1685 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1686 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1687 if (is_multicast_ether_addr(ehdr->h_dest)) {
1688 /*
1689 * send multicast frames both to higher layers in
1690 * local net stack and back to the wireless medium
1691 */
76ee65bf
RR		 1692 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1693 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1694 printk(KERN_DEBUG "%s: failed to clone "
1695 "multicast frame\n", dev->name);
1696 } else {
abe60632
JB		 1697 dsta = sta_info_get(sdata, skb->data);
1698 if (dsta) {
ce3edf6d
JB		 1699 /*
1700 * The destination station is associated to
1701 * this AP (in this VLAN), so send the frame
1702 * directly to it and do not pass it to local
1703 * net stack.
571ecf67 1704 */
76ee65bf 1705 xmit_skb = skb;
571ecf67
JB		 1706 skb = NULL;
1707 }
571ecf67
JB		 1708 }
1709 }
1710
1711 if (skb) {
d1c3a37c
JB		 1712 int align __maybe_unused;
1713
59d9cb07 1714#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1715 /*
1716 * 'align' will only take the values 0 or 2 here
1717 * since all frames are required to be aligned
1718 * to 2-byte boundaries when being passed to
1719 * mac80211. That also explains the __skb_push()
1720 * below.
1721 */
dacb6f1d 1722 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1723 if (align) {
1724 if (WARN_ON(skb_headroom(skb) < 3)) {
1725 dev_kfree_skb(skb);
1726 skb = NULL;
1727 } else {
1728 u8 *data = skb->data;
8ce0b589
ZY		 1729 size_t len = skb_headlen(skb);
1730 skb->data -= align;
1731 memmove(skb->data, data, len);
1732 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1733 }
1734 }
1735#endif
1736
1737 if (skb) {
1738 /* deliver to local stack */
1739 skb->protocol = eth_type_trans(skb, dev);
1740 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1741 netif_receive_skb(skb);
d1c3a37c 1742 }
571ecf67
JB		 1743 }
1744
76ee65bf 1745 if (xmit_skb) {
571ecf67 1746 /* send to wireless media */
f831e909 1747 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1748 skb_reset_network_header(xmit_skb);
1749 skb_reset_mac_header(xmit_skb);
76ee65bf 1750 dev_queue_xmit(xmit_skb);
571ecf67 1751 }
76ee65bf
RR		 1752}
1753
49461622 1754static ieee80211_rx_result debug_noinline
5cf121c3 1755ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1756{
eb9fb5b8 1757 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1758 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1760 __le16 fc = hdr->frame_control;
eaf85ca7 1761 struct sk_buff_head frame_list;
554891e6 1762 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1763
358c8d9d 1764 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1765 return RX_CONTINUE;
fd4c7f2f 1766
358c8d9d 1767 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1768 return RX_DROP_MONITOR;
fd4c7f2f 1769
554891e6 1770 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1771 return RX_CONTINUE;
fd4c7f2f 1772
eaf85ca7
ZY		 1773 if (ieee80211_has_a4(hdr->frame_control) &&
1774 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1775 !rx->sdata->u.vlan.sta)
e4c26add 1776 return RX_DROP_UNUSABLE;
fd4c7f2f 1777
eaf85ca7
ZY		 1778 if (is_multicast_ether_addr(hdr->addr1) &&
1779 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1780 rx->sdata->u.vlan.sta) ||
1781 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1782 rx->sdata->u.mgd.use_4addr)))
e4c26add 1783 return RX_DROP_UNUSABLE;
fd4c7f2f 1784
eaf85ca7
ZY		 1785 skb->dev = dev;
1786 __skb_queue_head_init(&frame_list);
fd4c7f2f 1787
e3cf8b3f
ZY		 1788 if (skb_linearize(skb))
1789 return RX_DROP_UNUSABLE;
1790
eaf85ca7
ZY		 1791 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1792 rx->sdata->vif.type,
8b3becad 1793 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1794
eaf85ca7
ZY		 1795 while (!skb_queue_empty(&frame_list)) {
1796 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1797
358c8d9d 1798 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1799 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1800 continue;
1801 }
eaf85ca7
ZY		 1802 dev->stats.rx_packets++;
1803 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1804
1805 ieee80211_deliver_skb(rx);
1806 }
1807
9ae54c84 1808 return RX_QUEUED;
fd4c7f2f
RR		 1809}
1810
bf94e17b 1811#ifdef CONFIG_MAC80211_MESH
b0dee578 1812static ieee80211_rx_result
e32f85f7
LCC		 1813ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1814{
1815 struct ieee80211_hdr *hdr;
1816 struct ieee80211s_hdr *mesh_hdr;
1817 unsigned int hdrlen;
1818 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1819 struct ieee80211_local *local = rx->local;
eb9fb5b8 1820 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1822
1823 hdr = (struct ieee80211_hdr *) skb->data;
1824 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1825 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1826
1827 if (!ieee80211_is_data(hdr->frame_control))
1828 return RX_CONTINUE;
1829
1830 if (!mesh_hdr->ttl)
1831 /* illegal frame */
1832 return RX_DROP_MONITOR;
1833
43b7b314 1834 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1835 struct mesh_path *mppath;
43b7b314
JC		 1836 char *proxied_addr;
1837 char *mpp_addr;
1838
1839 if (is_multicast_ether_addr(hdr->addr1)) {
1840 mpp_addr = hdr->addr3;
1841 proxied_addr = mesh_hdr->eaddr1;
1842 } else {
1843 mpp_addr = hdr->addr4;
1844 proxied_addr = mesh_hdr->eaddr2;
1845 }
79617dee 1846
79617dee 1847 rcu_read_lock();
43b7b314 1848 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1849 if (!mppath) {
43b7b314 1850 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1851 } else {
1852 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1853 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1854 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1855 spin_unlock_bh(&mppath->state_lock);
1856 }
1857 rcu_read_unlock();
1858 }
1859
3c5772a5
JC		 1860 /* Frame has reached destination. Don't forward */
1861 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1862 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1863 return RX_CONTINUE;
1864
1865 mesh_hdr->ttl--;
1866
554891e6 1867 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1868 if (!mesh_hdr->ttl)
472dbc45 1869 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1870 dropped_frames_ttl);
1871 else {
1872 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1873 struct ieee80211_tx_info *info;
1874
e32f85f7
LCC		 1875 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1876
1877 if (!fwd_skb && net_ratelimit())
1878 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1879 sdata->name);
919bbad5 1880 if (!fwd_skb)
b51aff05 1881 goto out;
e32f85f7
LCC		 1882
1883 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1884 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1885 info = IEEE80211_SKB_CB(fwd_skb);
1886 memset(info, 0, sizeof(*info));
1887 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1888 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1889 skb_set_queue_mapping(skb,
1890 ieee80211_select_queue(rx->sdata, fwd_skb));
1891 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1892 if (is_multicast_ether_addr(fwd_hdr->addr1))
1893 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1894 fwded_mcast);
1895 else {
3c5772a5
JC		 1896 int err;
1897 /*
1898 * Save TA to addr1 to send TA a path error if a
1899 * suitable next hop is not found
1900 */
1901 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1902 ETH_ALEN);
3c5772a5 1903 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1904 /* Failed to immediately resolve next hop:
1905 * fwded frame was dropped or will be added
1906 * later to the pending skb queue. */
1907 if (err)
1908 return RX_DROP_MONITOR;
c8a61a7d
DW		 1909
1910 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1911 fwded_unicast);
249b405c
JC		 1912 }
1913 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1914 fwded_frames);
3b8d81e0 1915 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1916 }
1917 }
1918
b51aff05 1919 out:
3c5772a5 1920 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1921 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1922 return RX_CONTINUE;
1923 else
1924 return RX_DROP_MONITOR;
1925}
bf94e17b 1926#endif
e32f85f7 1927
49461622 1928static ieee80211_rx_result debug_noinline
5cf121c3 1929ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1930{
eb9fb5b8 1931 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1932 struct ieee80211_local *local = rx->local;
eb9fb5b8 1933 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1934 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1935 __le16 fc = hdr->frame_control;
4114fa21 1936 bool port_control;
ce3edf6d 1937 int err;
76ee65bf 1938
358c8d9d 1939 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1940 return RX_CONTINUE;
76ee65bf 1941
358c8d9d 1942 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1943 return RX_DROP_MONITOR;
76ee65bf 1944
f14543ee
FF		 1945 /*
1946 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1947 * that a 4-addr station can be detected and moved into a separate VLAN
1948 */
1949 if (ieee80211_has_a4(hdr->frame_control) &&
1950 sdata->vif.type == NL80211_IFTYPE_AP)
1951 return RX_DROP_MONITOR;
1952
4114fa21 1953 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1954 if (unlikely(err))
e4c26add 1955 return RX_DROP_UNUSABLE;
76ee65bf 1956
358c8d9d 1957 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1958 return RX_DROP_MONITOR;
ce3edf6d 1959
4114fa21
FF		 1960 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1961 unlikely(port_control) && sdata->bss) {
1962 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1963 u.ap);
1964 dev = sdata->dev;
1965 rx->sdata = sdata;
1966 }
1967
76ee65bf
RR		 1968 rx->skb->dev = dev;
1969
1970 dev->stats.rx_packets++;
1971 dev->stats.rx_bytes += rx->skb->len;
1972
08ca944e 1973 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1974 !is_multicast_ether_addr(
1975 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1976 (!local->scanning &&
1977 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1978 mod_timer(&local->dynamic_ps_timer, jiffies +
1979 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1980 }
1981
76ee65bf 1982 ieee80211_deliver_skb(rx);
571ecf67 1983
9ae54c84 1984 return RX_QUEUED;
571ecf67
JB		 1985}
1986
49461622 1987static ieee80211_rx_result debug_noinline
24a8fdad 1988ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1989{
1990 struct ieee80211_local *local = rx->local;
1991 struct ieee80211_hw *hw = &local->hw;
1992 struct sk_buff *skb = rx->skb;
a7767f95 1993 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1994 struct tid_ampdu_rx *tid_agg_rx;
1995 u16 start_seq_num;
1996 u16 tid;
1997
a7767f95 1998 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1999 return RX_CONTINUE;
71364716 2000
a7767f95 2001 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2002 struct {
2003 __le16 control, start_seq_num;
2004 } __packed bar_data;
2005
71364716 2006 if (!rx->sta)
a02ae758 2007 return RX_DROP_MONITOR;
8ae5977f
JB		 2008
2009 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2010 &bar_data, sizeof(bar_data)))
2011 return RX_DROP_MONITOR;
2012
8ae5977f 2013 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2014
2015 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2016 if (!tid_agg_rx)
a02ae758 2017 return RX_DROP_MONITOR;
71364716 2018
8ae5977f 2019 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2020
2021 /* reset session timer */
20ad19d0
JB		 2022 if (tid_agg_rx->timeout)
2023 mod_timer(&tid_agg_rx->session_timer,
2024 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2025
dd318575 2026 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2027 /* release stored frames up to start of BAR */
24a8fdad 2028 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2029 spin_unlock(&tid_agg_rx->reorder_lock);
2030
a02ae758
JB		 2031 kfree_skb(skb);
2032 return RX_QUEUED;
71364716
RR		 2033 }
2034
08daecae
JB		 2035 /*
2036 * After this point, we only want management frames,
2037 * so we can drop all remaining control frames to
2038 * cooked monitor interfaces.
2039 */
2040 return RX_DROP_MONITOR;
71364716
RR		 2041}
2042
f4f727a6
JM		 2043static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2044 struct ieee80211_mgmt *mgmt,
2045 size_t len)
fea14732
JM		 2046{
2047 struct ieee80211_local *local = sdata->local;
2048 struct sk_buff *skb;
2049 struct ieee80211_mgmt *resp;
2050
47846c9b 2051 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2052 /* Not to own unicast address */
2053 return;
2054 }
2055
46900298
JB		 2056 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2057 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2058 /* Not from the current AP or not associated yet. */
fea14732
JM		 2059 return;
2060 }
2061
2062 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2063 /* Too short SA Query request frame */
2064 return;
2065 }
2066
2067 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2068 if (skb == NULL)
2069 return;
2070
2071 skb_reserve(skb, local->hw.extra_tx_headroom);
2072 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2073 memset(resp, 0, 24);
2074 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2075 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2076 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2077 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2078 IEEE80211_STYPE_ACTION);
2079 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2080 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2081 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2082 memcpy(resp->u.action.u.sa_query.trans_id,
2083 mgmt->u.action.u.sa_query.trans_id,
2084 WLAN_SA_QUERY_TR_ID_LEN);
2085
62ae67be 2086 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2087}
2088
2e161f78
JB		 2089static ieee80211_rx_result debug_noinline
2090ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2091{
2092 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2093 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2094
2095 /*
2096 * From here on, look only at management frames.
2097 * Data and control frames are already handled,
2098 * and unknown (reserved) frames are useless.
2099 */
2100 if (rx->skb->len < 24)
2101 return RX_DROP_MONITOR;
2102
2103 if (!ieee80211_is_mgmt(mgmt->frame_control))
2104 return RX_DROP_MONITOR;
2105
554891e6 2106 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2107 return RX_DROP_MONITOR;
2108
2109 if (ieee80211_drop_unencrypted_mgmt(rx))
2110 return RX_DROP_UNUSABLE;
2111
2112 return RX_CONTINUE;
2113}
2114
de1ede7a
JB		 2115static ieee80211_rx_result debug_noinline
2116ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2117{
2118 struct ieee80211_local *local = rx->local;
eb9fb5b8 2119 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2120 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2122 int len = rx->skb->len;
2123
2124 if (!ieee80211_is_action(mgmt->frame_control))
2125 return RX_CONTINUE;
2126
026331c4
JM		 2127 /* drop too small frames */
2128 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2129 return RX_DROP_UNUSABLE;
de1ede7a 2130
026331c4 2131 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2132 return RX_DROP_UNUSABLE;
de1ede7a 2133
554891e6 2134 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2135 return RX_DROP_UNUSABLE;
97ebe12a 2136
de1ede7a
JB		 2137 switch (mgmt->u.action.category) {
2138 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2139 /*
2140 * The aggregation code is not prepared to handle
2141 * anything but STA/AP due to the BSSID handling;
2142 * IBSS could work in the code but isn't supported
2143 * by drivers or the standard.
2144 */
2145 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2146 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2147 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2148 break;
8abd3f9b 2149
026331c4
JM		 2150 /* verify action_code is present */
2151 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2152 break;
2153
de1ede7a
JB		 2154 switch (mgmt->u.action.u.addba_req.action_code) {
2155 case WLAN_ACTION_ADDBA_REQ:
2156 if (len < (IEEE80211_MIN_ACTION_SIZE +
2157 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2158 goto invalid;
2159 break;
de1ede7a
JB		 2160 case WLAN_ACTION_ADDBA_RESP:
2161 if (len < (IEEE80211_MIN_ACTION_SIZE +
2162 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2163 goto invalid;
2164 break;
de1ede7a
JB		 2165 case WLAN_ACTION_DELBA:
2166 if (len < (IEEE80211_MIN_ACTION_SIZE +
2167 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2168 goto invalid;
2169 break;
2170 default:
2171 goto invalid;
de1ede7a 2172 }
bed7ee6e 2173
8b58ff83 2174 goto queue;
39192c0b
JB		 2175 case WLAN_CATEGORY_SPECTRUM_MGMT:
2176 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2177 break;
46900298
JB		 2178
2179 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2180 break;
46900298 2181
026331c4
JM		 2182 /* verify action_code is present */
2183 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2184 break;
2185
39192c0b
JB		 2186 switch (mgmt->u.action.u.measurement.action_code) {
2187 case WLAN_ACTION_SPCT_MSR_REQ:
2188 if (len < (IEEE80211_MIN_ACTION_SIZE +
2189 sizeof(mgmt->u.action.u.measurement)))
84040805 2190 break;
39192c0b 2191 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2192 goto handled;
c481ec97
S		 2193 case WLAN_ACTION_SPCT_CHL_SWITCH:
2194 if (len < (IEEE80211_MIN_ACTION_SIZE +
2195 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2196 break;
c481ec97 2197
cc32abd4 2198 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2199 break;
cc32abd4 2200
46900298 2201 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2202 break;
c481ec97 2203
8b58ff83 2204 goto queue;
39192c0b
JB		 2205 }
2206 break;
fea14732
JM		 2207 case WLAN_CATEGORY_SA_QUERY:
2208 if (len < (IEEE80211_MIN_ACTION_SIZE +
2209 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2210 break;
2211
fea14732
JM		 2212 switch (mgmt->u.action.u.sa_query.action) {
2213 case WLAN_ACTION_SA_QUERY_REQUEST:
2214 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2215 break;
fea14732 2216 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2217 goto handled;
fea14732
JM		 2218 }
2219 break;
d3aaec8a 2220 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2221 if (!ieee80211_vif_is_mesh(&sdata->vif))
2222 break;
8b58ff83 2223 goto queue;
c7108a71
JC		 2224 case WLAN_CATEGORY_MESH_PATH_SEL:
2225 if (!mesh_path_sel_is_hwmp(sdata))
2226 break;
2227 goto queue;
84040805 2228 }
026331c4 2229
2e161f78
JB		 2230 return RX_CONTINUE;
2231
bed7ee6e 2232 invalid:
554891e6 2233 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2234 /* will return in the next handlers */
2235 return RX_CONTINUE;
2236
2237 handled:
2238 if (rx->sta)
2239 rx->sta->rx_packets++;
2240 dev_kfree_skb(rx->skb);
2241 return RX_QUEUED;
2242
2243 queue:
2244 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2245 skb_queue_tail(&sdata->skb_queue, rx->skb);
2246 ieee80211_queue_work(&local->hw, &sdata->work);
2247 if (rx->sta)
2248 rx->sta->rx_packets++;
2249 return RX_QUEUED;
2250}
2251
2252static ieee80211_rx_result debug_noinline
2253ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2254{
554891e6 2255 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2256
2257 /* skip known-bad action frames and return them in the next handler */
554891e6 2258 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2259 return RX_CONTINUE;
d7907448 2260
026331c4
JM		 2261 /*
2262 * Getting here means the kernel doesn't know how to handle
2263 * it, but maybe userspace does ... include returned frames
2264 * so userspace can register for those to know whether ones
2265 * it transmitted were processed or returned.
2266 */
026331c4 2267
2e161f78
JB		 2268 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2269 rx->skb->data, rx->skb->len,
2270 GFP_ATOMIC)) {
2271 if (rx->sta)
2272 rx->sta->rx_packets++;
2273 dev_kfree_skb(rx->skb);
2274 return RX_QUEUED;
2275 }
2276
2277
2278 return RX_CONTINUE;
2279}
2280
2281static ieee80211_rx_result debug_noinline
2282ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2283{
2284 struct ieee80211_local *local = rx->local;
2285 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2286 struct sk_buff *nskb;
2287 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2288 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2289
2290 if (!ieee80211_is_action(mgmt->frame_control))
2291 return RX_CONTINUE;
2292
2293 /*
2294 * For AP mode, hostapd is responsible for handling any action
2295 * frames that we didn't handle, including returning unknown
2296 * ones. For all other modes we will return them to the sender,
2297 * setting the 0x80 bit in the action category, as required by
2298 * 802.11-2007 7.3.1.11.
2299 * Newer versions of hostapd shall also use the management frame
2300 * registration mechanisms, but older ones still use cooked
2301 * monitor interfaces so push all frames there.
2302 */
554891e6 2303 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2304 (sdata->vif.type == NL80211_IFTYPE_AP ||
2305 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2306 return RX_DROP_MONITOR;
026331c4 2307
84040805
JB		 2308 /* do not return rejected action frames */
2309 if (mgmt->u.action.category & 0x80)
2310 return RX_DROP_UNUSABLE;
2311
2312 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2313 GFP_ATOMIC);
2314 if (nskb) {
292b4df6 2315 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2316
292b4df6
JL		 2317 nmgmt->u.action.category |= 0x80;
2318 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2319 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2320
2321 memset(nskb->cb, 0, sizeof(nskb->cb));
2322
2323 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2324 }
39192c0b
JB		 2325 dev_kfree_skb(rx->skb);
2326 return RX_QUEUED;
de1ede7a
JB		 2327}
2328
49461622 2329static ieee80211_rx_result debug_noinline
5cf121c3 2330ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2331{
eb9fb5b8 2332 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2333 ieee80211_rx_result rxs;
77a121c3
JB		 2334 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2335 __le16 stype;
571ecf67 2336
af6b6374
JB		 2337 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2338 if (rxs != RX_CONTINUE)
2339 return rxs;
2340
77a121c3 2341 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2342
77a121c3
JB		 2343 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2344 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2345 sdata->vif.type != NL80211_IFTYPE_STATION)
2346 return RX_DROP_MONITOR;
472dbc45 2347
77a121c3
JB		 2348 switch (stype) {
2349 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2350 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2351 /* process for all: mesh, mlme, ibss */
2352 break;
2353 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2354 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2355 if (is_multicast_ether_addr(mgmt->da) &&
2356 !is_broadcast_ether_addr(mgmt->da))
2357 return RX_DROP_MONITOR;
2358
77a121c3
JB		 2359 /* process only for station */
2360 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2361 return RX_DROP_MONITOR;
2362 break;
2363 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2364 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2365 /* process only for ibss */
2366 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2367 return RX_DROP_MONITOR;
2368 break;
2369 default:
2370 return RX_DROP_MONITOR;
2371 }
f9d540ee 2372
77a121c3 2373 /* queue up frame and kick off work to process it */
c1475ca9 2374 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2375 skb_queue_tail(&sdata->skb_queue, rx->skb);
2376 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2377 if (rx->sta)
2378 rx->sta->rx_packets++;
46900298 2379
77a121c3 2380 return RX_QUEUED;
571ecf67
JB		 2381}
2382
5cf121c3 2383/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2384static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2385 struct ieee80211_rate *rate)
3d30d949
MW		 2386{
2387 struct ieee80211_sub_if_data *sdata;
2388 struct ieee80211_local *local = rx->local;
2389 struct ieee80211_rtap_hdr {
2390 struct ieee80211_radiotap_header hdr;
2391 u8 flags;
5f0b7de5 2392 u8 rate_or_pad;
3d30d949
MW		 2393 __le16 chan_freq;
2394 __le16 chan_flags;
bc10502d 2395 } __packed *rthdr;
3d30d949
MW		 2396 struct sk_buff *skb = rx->skb, *skb2;
2397 struct net_device *prev_dev = NULL;
eb9fb5b8 2398 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2399
554891e6
JB		 2400 /*
2401 * If cooked monitor has been processed already, then
2402 * don't do it again. If not, set the flag.
2403 */
2404 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2405 goto out_free_skb;
554891e6 2406 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2407
3d30d949
MW		 2408 if (skb_headroom(skb) < sizeof(*rthdr) &&
2409 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2410 goto out_free_skb;
2411
2412 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2413 memset(rthdr, 0, sizeof(*rthdr));
2414 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2415 rthdr->hdr.it_present =
2416 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2417 (1 << IEEE80211_RADIOTAP_CHANNEL));
2418
5f0b7de5
JB		 2419 if (rate) {
2420 rthdr->rate_or_pad = rate->bitrate / 5;
2421 rthdr->hdr.it_present |=
2422 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2423 }
3d30d949
MW		 2424 rthdr->chan_freq = cpu_to_le16(status->freq);
2425
2426 if (status->band == IEEE80211_BAND_5GHZ)
2427 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2428 IEEE80211_CHAN_5GHZ);
2429 else
2430 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2431 IEEE80211_CHAN_2GHZ);
2432
2433 skb_set_mac_header(skb, 0);
2434 skb->ip_summed = CHECKSUM_UNNECESSARY;
2435 skb->pkt_type = PACKET_OTHERHOST;
2436 skb->protocol = htons(ETH_P_802_2);
2437
2438 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2439 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2440 continue;
2441
05c914fe 2442 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2443 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2444 continue;
2445
2446 if (prev_dev) {
2447 skb2 = skb_clone(skb, GFP_ATOMIC);
2448 if (skb2) {
2449 skb2->dev = prev_dev;
5548a8a1 2450 netif_receive_skb(skb2);
3d30d949
MW		 2451 }
2452 }
2453
2454 prev_dev = sdata->dev;
2455 sdata->dev->stats.rx_packets++;
2456 sdata->dev->stats.rx_bytes += skb->len;
2457 }
2458
2459 if (prev_dev) {
2460 skb->dev = prev_dev;
5548a8a1 2461 netif_receive_skb(skb);
554891e6
JB		 2462 return;
2463 }
3d30d949
MW		 2464
2465 out_free_skb:
2466 dev_kfree_skb(skb);
2467}
2468
aa0c8636
CL		 2469static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2470 ieee80211_rx_result res)
2471{
2472 switch (res) {
2473 case RX_DROP_MONITOR:
2474 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2475 if (rx->sta)
2476 rx->sta->rx_dropped++;
2477 /* fall through */
2478 case RX_CONTINUE: {
2479 struct ieee80211_rate *rate = NULL;
2480 struct ieee80211_supported_band *sband;
2481 struct ieee80211_rx_status *status;
2482
2483 status = IEEE80211_SKB_RXCB((rx->skb));
2484
2485 sband = rx->local->hw.wiphy->bands[status->band];
2486 if (!(status->flag & RX_FLAG_HT))
2487 rate = &sband->bitrates[status->rate_idx];
2488
2489 ieee80211_rx_cooked_monitor(rx, rate);
2490 break;
2491 }
2492 case RX_DROP_UNUSABLE:
2493 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2494 if (rx->sta)
2495 rx->sta->rx_dropped++;
2496 dev_kfree_skb(rx->skb);
2497 break;
2498 case RX_QUEUED:
2499 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2500 break;
2501 }
2502}
571ecf67 2503
24a8fdad 2504static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2505{
58905290 2506 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2507 struct sk_buff *skb;
8944b79f 2508
e32f85f7
LCC		 2509#define CALL_RXH(rxh) \
2510 do { \
2511 res = rxh(rx); \
2512 if (res != RX_CONTINUE) \
2569a826 2513 goto rxh_next; \
e32f85f7 2514 } while (0);
49461622 2515
24a8fdad
CL		 2516 spin_lock(&rx->local->rx_skb_queue.lock);
2517 if (rx->local->running_rx_handler)
2518 goto unlock;
2519
2520 rx->local->running_rx_handler = true;
2521
2522 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2523 spin_unlock(&rx->local->rx_skb_queue.lock);
2524
2569a826
JB		 2525 /*
2526 * all the other fields are valid across frames
2527 * that belong to an aMPDU since they are on the
2528 * same TID from the same station
2529 */
2530 rx->skb = skb;
2531
2532 CALL_RXH(ieee80211_rx_h_decrypt)
2533 CALL_RXH(ieee80211_rx_h_check_more_data)
2534 CALL_RXH(ieee80211_rx_h_sta_process)
2535 CALL_RXH(ieee80211_rx_h_defragment)
2536 CALL_RXH(ieee80211_rx_h_ps_poll)
2537 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2538 /* must be after MMIC verify so header is counted in MPDU mic */
2539 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2540 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2541#ifdef CONFIG_MAC80211_MESH
aa0c8636 2542 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2543 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2544#endif
2569a826 2545 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2546 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2547 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2548 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2549 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2550 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2551 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2552
aa0c8636
CL		 2553 rxh_next:
2554 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2555 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2556#undef CALL_RXH
aa0c8636 2557 }
24a8fdad
CL		 2558
2559 rx->local->running_rx_handler = false;
2560
2561 unlock:
2562 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2563}
2564
4406c376 2565static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2566{
aa0c8636
CL		 2567 ieee80211_rx_result res = RX_DROP_MONITOR;
2568
aa0c8636
CL		 2569#define CALL_RXH(rxh) \
2570 do { \
2571 res = rxh(rx); \
2572 if (res != RX_CONTINUE) \
2573 goto rxh_next; \
2574 } while (0);
2575
2576 CALL_RXH(ieee80211_rx_h_passive_scan)
2577 CALL_RXH(ieee80211_rx_h_check)
2578
24a8fdad 2579 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2580
24a8fdad 2581 ieee80211_rx_handlers(rx);
aa0c8636 2582 return;
49461622 2583
2569a826 2584 rxh_next:
aa0c8636
CL		 2585 ieee80211_rx_handlers_result(rx, res);
2586
2587#undef CALL_RXH
58905290
JB		 2588}
2589
2bff8ebf 2590/*
dd318575
JB		 2591 * This function makes calls into the RX path, therefore
2592 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2593 */
2594void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2595{
554891e6
JB		 2596 struct ieee80211_rx_data rx = {
2597 .sta = sta,
2598 .sdata = sta->sdata,
2599 .local = sta->local,
9e26297a
JB		 2600 /* This is OK -- must be QoS data frame */
2601 .security_idx = tid,
2602 .seqno_idx = tid,
fcf8bd3b 2603 .flags = 0,
554891e6 2604 };
2c15a0cf
CL		 2605 struct tid_ampdu_rx *tid_agg_rx;
2606
2607 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2608 if (!tid_agg_rx)
2609 return;
2bff8ebf 2610
2c15a0cf 2611 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2612 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2613 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2614
24a8fdad 2615 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2616}
2617
571ecf67
JB		 2618/* main receive path */
2619
20b01f80 2620static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2621 struct ieee80211_hdr *hdr)
2622{
20b01f80 2623 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2624 struct sk_buff *skb = rx->skb;
2625 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2626 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2627 int multicast = is_multicast_ether_addr(hdr->addr1);
2628
51fb61e7 2629 switch (sdata->vif.type) {
05c914fe 2630 case NL80211_IFTYPE_STATION:
9bc383de 2631 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2632 return 0;
77fdaa12 2633 if (!multicast &&
47846c9b 2634 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2635 if (!(sdata->dev->flags & IFF_PROMISC) ||
2636 sdata->u.mgd.use_4addr)
23a24def 2637 return 0;
554891e6 2638 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2639 }
2640 break;
05c914fe 2641 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2642 if (!bssid)
2643 return 0;
a7767f95 2644 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2645 return 1;
87291c02 2646 }
46900298 2647 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2648 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2649 return 0;
554891e6 2650 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2651 } else if (!multicast &&
47846c9b 2652 compare_ether_addr(sdata->vif.addr,
23a24def 2653 hdr->addr1) != 0) {
4150c572 2654 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2655 return 0;
554891e6 2656 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2657 } else if (!rx->sta) {
2658 int rate_idx;
eb9fb5b8 2659 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2660 rate_idx = 0; /* TODO: HT rates */
2661 else
eb9fb5b8 2662 rate_idx = status->rate_idx;
34e89507
JB		 2663 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2664 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2665 }
23a24def 2666 break;
05c914fe 2667 case NL80211_IFTYPE_MESH_POINT:
6032f934 2668 if (!multicast &&
47846c9b 2669 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2670 hdr->addr1) != 0) {
2671 if (!(sdata->dev->flags & IFF_PROMISC))
2672 return 0;
2673
554891e6 2674 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2675 }
2676 break;
05c914fe
JB		 2677 case NL80211_IFTYPE_AP_VLAN:
2678 case NL80211_IFTYPE_AP:
23a24def 2679 if (!bssid) {
47846c9b 2680 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2681 hdr->addr1))
2682 return 0;
2683 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2684 sdata->vif.addr)) {
771bbd09
AN		 2685 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2686 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2687 return 0;
554891e6 2688 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2689 }
23a24def 2690 break;
05c914fe 2691 case NL80211_IFTYPE_WDS:
a7767f95 2692 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2693 return 0;
2694 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2695 return 0;
2696 break;
2ca27bcf 2697 default:
fb1c1cd6
JB		 2698 /* should never get here */
2699 WARN_ON(1);
2700 break;
23a24def
JB		 2701 }
2702
2703 return 1;
2704}
2705
4406c376
JB		 2706/*
2707 * This function returns whether or not the SKB
2708 * was destined for RX processing or not, which,
2709 * if consume is true, is equivalent to whether
2710 * or not the skb was consumed.
2711 */
2712static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2713 struct sk_buff *skb, bool consume)
2714{
2715 struct ieee80211_local *local = rx->local;
2716 struct ieee80211_sub_if_data *sdata = rx->sdata;
2717 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2718 struct ieee80211_hdr *hdr = (void *)skb->data;
2719 int prepares;
2720
2721 rx->skb = skb;
554891e6 2722 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2723 prepares = prepare_for_handlers(rx, hdr);
2724
2725 if (!prepares)
2726 return false;
2727
4406c376
JB		 2728 if (!consume) {
2729 skb = skb_copy(skb, GFP_ATOMIC);
2730 if (!skb) {
2731 if (net_ratelimit())
2732 wiphy_debug(local->hw.wiphy,
b305dae4 2733 "failed to copy skb for %s\n",
4406c376
JB		 2734 sdata->name);
2735 return true;
2736 }
2737
2738 rx->skb = skb;
2739 }
2740
2741 ieee80211_invoke_rx_handlers(rx);
2742 return true;
2743}
2744
571ecf67 2745/*
6368e4b1
RR		 2746 * This is the actual Rx frames handler. as it blongs to Rx path it must
2747 * be called with rcu_read_lock protection.
571ecf67 2748 */
71ebb4aa 2749static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2750 struct sk_buff *skb)
571ecf67 2751{
554891e6 2752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2753 struct ieee80211_local *local = hw_to_local(hw);
2754 struct ieee80211_sub_if_data *sdata;
571ecf67 2755 struct ieee80211_hdr *hdr;
e3cf8b3f 2756 __le16 fc;
5cf121c3 2757 struct ieee80211_rx_data rx;
4406c376 2758 struct ieee80211_sub_if_data *prev;
56af3268 2759 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2760 int err = 0;
571ecf67 2761
e3cf8b3f 2762 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2763 memset(&rx, 0, sizeof(rx));
2764 rx.skb = skb;
2765 rx.local = local;
72abd81b 2766
e3cf8b3f 2767 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2768 local->dot11ReceivedFragmentCount++;
571ecf67 2769
142b9f50 2770 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2771 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2772 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2773
e3cf8b3f
ZY		 2774 if (ieee80211_is_mgmt(fc))
2775 err = skb_linearize(skb);
2776 else
2777 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2778
2779 if (err) {
2780 dev_kfree_skb(skb);
2781 return;
2782 }
2783
2784 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2785 ieee80211_parse_qos(&rx);
d1c3a37c 2786 ieee80211_verify_alignment(&rx);
38f3714d 2787
e3cf8b3f 2788 if (ieee80211_is_data(fc)) {
56af3268 2789 prev_sta = NULL;
4406c376 2790
abe60632 2791 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2792 if (!prev_sta) {
2793 prev_sta = sta;
2794 continue;
2795 }
2796
2797 rx.sta = prev_sta;
2798 rx.sdata = prev_sta->sdata;
4406c376 2799 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2800
56af3268 2801 prev_sta = sta;
4406c376 2802 }
56af3268
BG		 2803
2804 if (prev_sta) {
2805 rx.sta = prev_sta;
2806 rx.sdata = prev_sta->sdata;
2807
4406c376 2808 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2809 return;
8e26d5ad 2810 goto out;
56af3268 2811 }
4406c376
JB		 2812 }
2813
4b0dd98e 2814 prev = NULL;
b2e7771e 2815
4b0dd98e
JB		 2816 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2817 if (!ieee80211_sdata_running(sdata))
2818 continue;
340e11f3 2819
4b0dd98e
JB		 2820 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2821 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2822 continue;
340e11f3 2823
4b0dd98e
JB		 2824 /*
2825 * frame is destined for this interface, but if it's
2826 * not also for the previous one we handle that after
2827 * the loop to avoid copying the SKB once too much
2828 */
4bb29f8c 2829
4b0dd98e 2830 if (!prev) {
abe60632 2831 prev = sdata;
4b0dd98e 2832 continue;
340e11f3 2833 }
4bb29f8c 2834
4b0dd98e
JB		 2835 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2836 rx.sdata = prev;
2837 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2838
4b0dd98e
JB		 2839 prev = sdata;
2840 }
2841
2842 if (prev) {
2843 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2844 rx.sdata = prev;
4406c376 2845
4b0dd98e
JB		 2846 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2847 return;
571ecf67 2848 }
4406c376 2849
8e26d5ad 2850 out:
4406c376 2851 dev_kfree_skb(skb);
571ecf67 2852}
6368e4b1
RR		 2853
2854/*
2855 * This is the receive path handler. It is called by a low level driver when an
2856 * 802.11 MPDU is received from the hardware.
2857 */
103bf9f7 2858void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2859{
2860 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2861 struct ieee80211_rate *rate = NULL;
2862 struct ieee80211_supported_band *sband;
f1d58c25 2863 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2864
d20ef63d
JB		 2865 WARN_ON_ONCE(softirq_count() == 0);
2866
77a980dc
JB		 2867 if (WARN_ON(status->band < 0 ||
2868 status->band >= IEEE80211_NUM_BANDS))
2869 goto drop;
8318d78a
JB		 2870
2871 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2872 if (WARN_ON(!sband))
2873 goto drop;
8318d78a 2874
89c3a8ac
JB		 2875 /*
2876 * If we're suspending, it is possible although not too likely
2877 * that we'd be receiving frames after having already partially
2878 * quiesced the stack. We can't process such frames then since
2879 * that might, for example, cause stations to be added or other
2880 * driver callbacks be invoked.
2881 */
77a980dc
JB		 2882 if (unlikely(local->quiescing || local->suspended))
2883 goto drop;
89c3a8ac 2884
ea77f12f
JB		 2885 /*
2886 * The same happens when we're not even started,
2887 * but that's worth a warning.
2888 */
77a980dc
JB		 2889 if (WARN_ON(!local->started))
2890 goto drop;
ea77f12f 2891
fc885189 2892 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2893 /*
fc885189
JB		 2894 * Validate the rate, unless a PLCP error means that
2895 * we probably can't have a valid rate here anyway.
e5d6eb83 2896 */
fc885189
JB		 2897
2898 if (status->flag & RX_FLAG_HT) {
2899 /*
2900 * rate_idx is MCS index, which can be [0-76]
2901 * as documented on:
2902 *
2903 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2904 *
2905 * Anything else would be some sort of driver or
2906 * hardware error. The driver should catch hardware
2907 * errors.
2908 */
2909 if (WARN((status->rate_idx < 0 ||
2910 status->rate_idx > 76),
2911 "Rate marked as an HT rate but passed "
2912 "status->rate_idx is not "
2913 "an MCS index [0-76]: %d (0x%02x)\n",
2914 status->rate_idx,
2915 status->rate_idx))
2916 goto drop;
2917 } else {
2918 if (WARN_ON(status->rate_idx < 0 ||
2919 status->rate_idx >= sband->n_bitrates))
2920 goto drop;
2921 rate = &sband->bitrates[status->rate_idx];
2922 }
0fb8ca45 2923 }
6368e4b1 2924
554891e6
JB		 2925 status->rx_flags = 0;
2926
6368e4b1
RR		 2927 /*
2928 * key references and virtual interfaces are protected using RCU
2929 * and this requires that we are in a read-side RCU section during
2930 * receive processing
2931 */
2932 rcu_read_lock();
2933
2934 /*
2935 * Frames with failed FCS/PLCP checksum are not returned,
2936 * all other frames are returned without radiotap header
2937 * if it was previously present.
2938 * Also, frames with less than 16 bytes are dropped.
2939 */
f1d58c25 2940 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2941 if (!skb) {
2942 rcu_read_unlock();
2943 return;
2944 }
2945
e1e54068
JB		 2946 ieee80211_tpt_led_trig_rx(local,
2947 ((struct ieee80211_hdr *)skb->data)->frame_control,
2948 skb->len);
071d9ac2 2949 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2950
2951 rcu_read_unlock();
77a980dc
JB		 2952
2953 return;
2954 drop:
2955 kfree_skb(skb);
6368e4b1 2956}
103bf9f7 2957EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2958
2959/* This is a version of the rx handler that can be called from hard irq
2960 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2961void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2962{
2963 struct ieee80211_local *local = hw_to_local(hw);
2964
2965 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2966
571ecf67
JB		 2967 skb->pkt_type = IEEE80211_RX_MSG;
2968 skb_queue_tail(&local->skb_queue, skb);
2969 tasklet_schedule(&local->tasklet);
2970}
2971EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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