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mac80211: allow releasing driver-buffered frames
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2 145 * MCS information is a separate field in radiotap,
73b48099
JB		 146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 148 */
149 *pos = 0;
8d6f658e 150 } else {
ebe6c7ba 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 152 *pos = rate->bitrate / 5;
8d6f658e 153 }
601ae7f2
BR		 154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 157 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
5f0b7de5
JB		 162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
9deb1ae5 165 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
601ae7f2 168 else
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
601ae7f2
BR		 171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
601ae7f2
BR		 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
601ae7f2
BR		 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 191 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 192 pos++;
aae89831 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
601ae7f2 196 pos += 2;
6d744bac
JB		 197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
601ae7f2
BR		 211}
212
b2e7771e
JB		 213/*
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 220 struct ieee80211_rate *rate)
b2e7771e 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 223 struct ieee80211_sub_if_data *sdata;
b2e7771e 224 int needed_headroom = 0;
b2e7771e
JB		 225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
b2e7771e
JB		 228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
0869aea0
JB		 237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
e3cf8b3f
ZY		 244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
b2e7771e 250 if (!local->monitors) {
0869aea0 251 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
0869aea0 256 return remove_monitor_info(local, origskb);
b2e7771e
JB		 257 }
258
0869aea0 259 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
0869aea0 283 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 284
285 if (!skb)
286 return origskb;
287 }
288
0869aea0
JB		 289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 291
ce3edf6d 292 skb_reset_mac_header(skb);
b2e7771e
JB		 293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
9607e6b6 304 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
5548a8a1 311 netif_receive_skb(skb2);
b2e7771e
JB		 312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
5548a8a1 322 netif_receive_skb(skb);
b2e7771e
JB		 323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
5cf121c3 330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 331{
238f74a2 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 334 int tid, seqno_idx, security_idx;
6e0d114d
JB		 335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 341 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 342 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 343
344 seqno_idx = tid;
345 security_idx = tid;
6e0d114d 346 } else {
1411f9b5
JB		 347 /*
348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 *
350 * Sequence numbers for management frames, QoS data
351 * frames with a broadcast/multicast address in the
352 * Address 1 field, and all non-QoS data frames sent
353 * by QoS STAs are assigned using an additional single
354 * modulo-4096 counter, [...]
355 *
356 * We also use that counter for non-QoS STAs.
357 */
9e26297a
JB		 358 seqno_idx = NUM_RX_DATA_QUEUES;
359 security_idx = 0;
360 if (ieee80211_is_mgmt(hdr->frame_control))
361 security_idx = NUM_RX_DATA_QUEUES;
362 tid = 0;
6e0d114d 363 }
52865dfd 364
9e26297a
JB		 365 rx->seqno_idx = seqno_idx;
366 rx->security_idx = security_idx;
6e0d114d
JB		 367 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368 * For now, set skb->priority to 0 for other cases. */
369 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 370}
6e0d114d 371
d1c3a37c
JB		 372/**
373 * DOC: Packet alignment
374 *
375 * Drivers always need to pass packets that are aligned to two-byte boundaries
376 * to the stack.
377 *
378 * Additionally, should, if possible, align the payload data in a way that
379 * guarantees that the contained IP header is aligned to a four-byte
380 * boundary. In the case of regular frames, this simply means aligning the
381 * payload to a four-byte boundary (because either the IP header is directly
382 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 383 * in front of it). If the payload data is not properly aligned and the
384 * architecture doesn't support efficient unaligned operations, mac80211
385 * will align the data.
d1c3a37c
JB		 386 *
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
392 *
25985edc 393 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
396 */
397static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 398{
59d9cb07
KV		 399#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400 WARN_ONCE((unsigned long)rx->skb->data & 1,
401 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 402#endif
6e0d114d
JB		 403}
404
6368e4b1 405
571ecf67
JB		 406/* rx handlers */
407
49461622 408static ieee80211_rx_result debug_noinline
5cf121c3 409ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 410{
411 struct ieee80211_local *local = rx->local;
554891e6 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 413 struct sk_buff *skb = rx->skb;
414
79f460ca
LC		 415 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
416 !local->sched_scanning))
4080c7cd
JB		 417 return RX_CONTINUE;
418
b23b025f 419 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 420 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
421 local->sched_scanning)
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
4080c7cd
JB		 424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426 return RX_DROP_UNUSABLE;
571ecf67
JB		 427}
428
3cfcf6ac
JM		 429
430static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431{
432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return 0;
436
437 return ieee80211_is_robust_mgmt_frame(hdr);
438}
439
440
441static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454{
455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456 struct ieee80211_mmie *mmie;
457
458 if (skb->len < 24 + sizeof(*mmie) ||
459 !is_multicast_ether_addr(hdr->da))
460 return -1;
461
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463 return -1; /* not a robust management frame */
464
465 mmie = (struct ieee80211_mmie *)
466 (skb->data + skb->len - sizeof(*mmie));
467 if (mmie->element_id != WLAN_EID_MMIE ||
468 mmie->length != sizeof(*mmie) - 2)
469 return -1;
470
471 return le16_to_cpu(mmie->key_id);
472}
473
474
33b64eb2 475static ieee80211_rx_result
5cf121c3 476ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 477{
a7767f95 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 479 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 480
a7767f95 481 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 482 if (is_multicast_ether_addr(hdr->addr1)) {
483 if (ieee80211_has_tods(hdr->frame_control) ||
484 !ieee80211_has_fromds(hdr->frame_control))
485 return RX_DROP_MONITOR;
486 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
487 return RX_DROP_MONITOR;
488 } else {
489 if (!ieee80211_has_a4(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
493 }
33b64eb2
LCC		 494 }
495
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
498 */
499
57cf8043 500 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 501 struct ieee80211_mgmt *mgmt;
d6d1a5a7 502
a7767f95 503 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 504 return RX_DROP_MONITOR;
505
a7767f95 506 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 507 u8 category;
33b64eb2 508 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 509 category = mgmt->u.action.category;
510 if (category != WLAN_CATEGORY_MESH_ACTION &&
511 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 512 return RX_DROP_MONITOR;
33b64eb2 513 return RX_CONTINUE;
33b64eb2
LCC		 514 }
515
a7767f95
HH		 516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 518 ieee80211_is_beacon(hdr->frame_control) ||
519 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 520 return RX_CONTINUE;
521
522 return RX_DROP_MONITOR;
523
524 }
525
902acc78
JB		 526 return RX_CONTINUE;
527}
33b64eb2 528
1edfb1af
JB		 529#define SEQ_MODULO 0x1000
530#define SEQ_MASK 0xfff
531
532static inline int seq_less(u16 sq1, u16 sq2)
533{
534 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
535}
536
537static inline u16 seq_inc(u16 sq)
538{
539 return (sq + 1) & SEQ_MASK;
540}
541
542static inline u16 seq_sub(u16 sq1, u16 sq2)
543{
544 return (sq1 - sq2) & SEQ_MASK;
545}
546
547
548static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
549 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 550 int index)
1edfb1af 551{
24a8fdad 552 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 553 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 554 struct ieee80211_rx_status *status;
1edfb1af 555
dd318575
JB		 556 lockdep_assert_held(&tid_agg_rx->reorder_lock);
557
1edfb1af
JB		 558 if (!skb)
559 goto no_frame;
560
071d9ac2 561 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 562 tid_agg_rx->stored_mpdu_num--;
563 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 564 status = IEEE80211_SKB_RXCB(skb);
565 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 566 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 567
568no_frame:
569 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
570}
571
572static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
573 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 574 u16 head_seq_num)
1edfb1af
JB		 575{
576 int index;
577
dd318575
JB		 578 lockdep_assert_held(&tid_agg_rx->reorder_lock);
579
1edfb1af
JB		 580 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
581 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
582 tid_agg_rx->buf_size;
24a8fdad 583 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 584 }
585}
586
587/*
588 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
589 * the skb was added to the buffer longer than this time ago, the earlier
590 * frames that have not yet been received are assumed to be lost and the skb
591 * can be released for processing. This may also release other skb's from the
592 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 593 *
594 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 595 */
596#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
597
aa0c8636 598static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 599 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 600{
2bff8ebf 601 int index, j;
aa0c8636 602
dd318575
JB		 603 lockdep_assert_held(&tid_agg_rx->reorder_lock);
604
aa0c8636
CL		 605 /* release the buffer until next missing frame */
606 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
607 tid_agg_rx->buf_size;
608 if (!tid_agg_rx->reorder_buf[index] &&
609 tid_agg_rx->stored_mpdu_num > 1) {
610 /*
611 * No buffers ready to be released, but check whether any
612 * frames in the reorder buffer have timed out.
613 */
aa0c8636
CL		 614 int skipped = 1;
615 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
616 j = (j + 1) % tid_agg_rx->buf_size) {
617 if (!tid_agg_rx->reorder_buf[j]) {
618 skipped++;
619 continue;
620 }
499fe9a4
DH		 621 if (skipped &&
622 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 623 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 624 goto set_release_timer;
aa0c8636
CL		 625
626#ifdef CONFIG_MAC80211_HT_DEBUG
627 if (net_ratelimit())
0fb9a9ec
JP		 628 wiphy_debug(hw->wiphy,
629 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 630#endif
24a8fdad 631 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 632
633 /*
634 * Increment the head seq# also for the skipped slots.
635 */
636 tid_agg_rx->head_seq_num =
637 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
638 skipped = 0;
639 }
640 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 641 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 642 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
643 tid_agg_rx->buf_size;
644 }
2bff8ebf
CL		 645
646 if (tid_agg_rx->stored_mpdu_num) {
647 j = index = seq_sub(tid_agg_rx->head_seq_num,
648 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
649
650 for (; j != (index - 1) % tid_agg_rx->buf_size;
651 j = (j + 1) % tid_agg_rx->buf_size) {
652 if (tid_agg_rx->reorder_buf[j])
653 break;
654 }
655
656 set_release_timer:
657
658 mod_timer(&tid_agg_rx->reorder_timer,
334df731 659 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 660 HT_RX_REORDER_BUF_TIMEOUT);
661 } else {
662 del_timer(&tid_agg_rx->reorder_timer);
663 }
aa0c8636
CL		 664}
665
1edfb1af
JB		 666/*
667 * As this function belongs to the RX path it must be under
668 * rcu_read_lock protection. It returns false if the frame
669 * can be processed immediately, true if it was consumed.
670 */
671static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
672 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 673 struct sk_buff *skb)
1edfb1af
JB		 674{
675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676 u16 sc = le16_to_cpu(hdr->seq_ctrl);
677 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
678 u16 head_seq_num, buf_size;
679 int index;
2bff8ebf 680 bool ret = true;
1edfb1af 681
dd318575
JB		 682 spin_lock(&tid_agg_rx->reorder_lock);
683
1edfb1af
JB		 684 buf_size = tid_agg_rx->buf_size;
685 head_seq_num = tid_agg_rx->head_seq_num;
686
687 /* frame with out of date sequence number */
688 if (seq_less(mpdu_seq_num, head_seq_num)) {
689 dev_kfree_skb(skb);
2bff8ebf 690 goto out;
1edfb1af
JB		 691 }
692
693 /*
694 * If frame the sequence number exceeds our buffering window
695 * size release some previous frames to make room for this one.
696 */
697 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
698 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
699 /* release stored frames up to new head to stack */
24a8fdad 700 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 701 }
702
703 /* Now the new frame is always in the range of the reordering buffer */
704
705 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
706
707 /* check if we already stored this frame */
708 if (tid_agg_rx->reorder_buf[index]) {
709 dev_kfree_skb(skb);
2bff8ebf 710 goto out;
1edfb1af
JB		 711 }
712
713 /*
714 * If the current MPDU is in the right order and nothing else
715 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 716 * If it is first but there's something stored, we may be able
717 * to release frames after this one.
1edfb1af
JB		 718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 722 ret = false;
723 goto out;
1edfb1af
JB		 724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
24a8fdad 730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 731
2bff8ebf
CL		 732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
1edfb1af
JB		 735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
24a8fdad 741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 742{
2569a826
JB		 743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 747 struct sta_info *sta = rx->sta;
1edfb1af
JB		 748 struct tid_ampdu_rx *tid_agg_rx;
749 u16 sc;
750 int tid;
751
752 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 753 goto dont_reorder;
1edfb1af
JB		 754
755 /*
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
758 */
759
1edfb1af 760 if (!sta)
2569a826 761 goto dont_reorder;
1edfb1af
JB		 762
763 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
764
a87f736d
JB		 765 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
766 if (!tid_agg_rx)
767 goto dont_reorder;
1edfb1af
JB		 768
769 /* qos null data frames are excluded */
770 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 771 goto dont_reorder;
1edfb1af
JB		 772
773 /* new, potentially un-ordered, ampdu frame - process it */
774
775 /* reset session timer */
776 if (tid_agg_rx->timeout)
777 mod_timer(&tid_agg_rx->session_timer,
778 TU_TO_EXP_TIME(tid_agg_rx->timeout));
779
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc = le16_to_cpu(hdr->seq_ctrl);
782 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 783 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 784 skb_queue_tail(&rx->sdata->skb_queue, skb);
785 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 786 return;
1edfb1af
JB		 787 }
788
a87f736d
JB		 789 /*
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
794 * anything with it.
795 */
24a8fdad 796 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 797 return;
798
799 dont_reorder:
24a8fdad 800 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 801}
33b64eb2 802
49461622 803static ieee80211_rx_result debug_noinline
5cf121c3 804ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 805{
a7767f95 806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 808
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 811 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 812 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 813 hdr->seq_ctrl)) {
554891e6 814 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 815 rx->local->dot11FrameDuplicateCount++;
816 rx->sta->num_duplicates++;
817 }
b1f93314 818 return RX_DROP_UNUSABLE;
571ecf67 819 } else
9e26297a 820 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 821 }
822
571ecf67
JB		 823 if (unlikely(rx->skb->len < 16)) {
824 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 825 return RX_DROP_MONITOR;
571ecf67
JB		 826 }
827
571ecf67
JB		 828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
830 *
ccd7b362
JB		 831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
835 */
33b64eb2 836
902acc78 837 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 838 return ieee80211_rx_mesh_check(rx);
33b64eb2 839
a7767f95
HH		 840 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 842 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 843 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
2a33bee2
GE		 844 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
845 if (rx->sta && rx->sta->dummy &&
846 ieee80211_is_data_present(hdr->frame_control)) {
847 u16 ethertype;
848 u8 *payload;
849
850 payload = rx->skb->data +
851 ieee80211_hdrlen(hdr->frame_control);
852 ethertype = (payload[6] << 8) | payload[7];
853 if (cpu_to_be16(ethertype) ==
854 rx->sdata->control_port_protocol)
855 return RX_CONTINUE;
856 }
e4c26add 857 return RX_DROP_MONITOR;
2a33bee2 858 }
571ecf67 859
9ae54c84 860 return RX_CONTINUE;
570bd537
JB		 861}
862
863
49461622 864static ieee80211_rx_result debug_noinline
5cf121c3 865ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 866{
eb9fb5b8
JB		 867 struct sk_buff *skb = rx->skb;
868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
869 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 870 int keyidx;
871 int hdrlen;
e4c26add 872 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 873 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 874 int mmie_keyidx = -1;
761ab470 875 __le16 fc;
570bd537 876
3017b80b
JB		 877 /*
878 * Key selection 101
879 *
3cfcf6ac 880 * There are four types of keys:
3017b80b 881 * - GTK (group keys)
3cfcf6ac 882 * - IGTK (group keys for management frames)
3017b80b
JB		 883 * - PTK (pairwise keys)
884 * - STK (station-to-station pairwise keys)
885 *
886 * When selecting a key, we have to distinguish between multicast
887 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 888 * use PTKs and STKs while the former always use GTKs and IGTKs.
889 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890 * unicast frames can also use key indices like GTKs. Hence, if we
891 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 892 *
8dc06a1c
JB		 893 * Note that in a regular BSS, multicast frames are sent by the
894 * AP only, associated stations unicast the frame to the AP first
895 * which then multicasts it on their behalf.
896 *
3017b80b
JB		 897 * There is also a slight problem in IBSS mode: GTKs are negotiated
898 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 899 * The spec seems to expect that one negotiates the same key with
900 * every station but there's no such requirement; VLANs could be
901 * possible.
3017b80b
JB		 902 */
903
3017b80b 904 /*
1990af8d 905 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 906 * addressed to us nor a multicast frame.
907 */
554891e6 908 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 909 return RX_CONTINUE;
3017b80b 910
2569a826
JB		 911 /* start without a key */
912 rx->key = NULL;
913
d4e46a3d 914 if (rx->sta)
e31b8213 915 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 916
761ab470
JB		 917 fc = hdr->frame_control;
918
919 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 920 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
921
e31b8213
JB		 922 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
923 rx->key = sta_ptk;
dc1580dd
JB		 924 if ((status->flag & RX_FLAG_DECRYPTED) &&
925 (status->flag & RX_FLAG_IV_STRIPPED))
926 return RX_CONTINUE;
0c7c10c7 927 /* Skip decryption if the frame is not protected. */
761ab470 928 if (!ieee80211_has_protected(fc))
0c7c10c7 929 return RX_CONTINUE;
3cfcf6ac
JM		 930 } else if (mmie_keyidx >= 0) {
931 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 932 if ((status->flag & RX_FLAG_DECRYPTED) &&
933 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 934 return RX_CONTINUE;
935
936 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
937 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
938 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 939 if (rx->sta)
940 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
941 if (!rx->key)
942 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 943 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 944 /*
945 * The frame was not protected, so skip decryption. However, we
946 * need to set rx->key if there is a key that could have been
947 * used so that the frame may be dropped if encryption would
948 * have been expected.
949 */
950 struct ieee80211_key *key = NULL;
897bed8b
JB		 951 struct ieee80211_sub_if_data *sdata = rx->sdata;
952 int i;
953
761ab470 954 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 955 is_multicast_ether_addr(hdr->addr1) &&
956 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
957 rx->key = key;
897bed8b
JB		 958 else {
959 if (rx->sta) {
960 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
961 key = rcu_dereference(rx->sta->gtk[i]);
962 if (key)
963 break;
964 }
965 }
966 if (!key) {
967 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
968 key = rcu_dereference(sdata->keys[i]);
969 if (key)
970 break;
971 }
972 }
973 if (key)
974 rx->key = key;
975 }
0c7c10c7 976 return RX_CONTINUE;
571ecf67 977 } else {
39184b15 978 u8 keyid;
3017b80b
JB		 979 /*
980 * The device doesn't give us the IV so we won't be
981 * able to look up the key. That's ok though, we
982 * don't need to decrypt the frame, we just won't
983 * be able to keep statistics accurate.
984 * Except for key threshold notifications, should
985 * we somehow allow the driver to tell us which key
986 * the hardware used if this flag is set?
987 */
eb9fb5b8
JB		 988 if ((status->flag & RX_FLAG_DECRYPTED) &&
989 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 990 return RX_CONTINUE;
3017b80b 991
761ab470 992 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 993
994 if (rx->skb->len < 8 + hdrlen)
e4c26add 995 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 996
997 /*
998 * no need to call ieee80211_wep_get_keyidx,
999 * it verifies a bunch of things we've done already
1000 */
39184b15
ZY		 1001 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1002 keyidx = keyid >> 6;
3017b80b 1003
e31b8213
JB		 1004 /* check per-station GTK first, if multicast packet */
1005 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1006 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1007
e31b8213
JB		 1008 /* if not found, try default key */
1009 if (!rx->key) {
1010 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1011
1012 /*
1013 * RSNA-protected unicast frames should always be
1014 * sent with pairwise or station-to-station keys,
1015 * but for WEP we allow using a key index as well.
1016 */
1017 if (rx->key &&
1018 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1019 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1020 !is_multicast_ether_addr(hdr->addr1))
1021 rx->key = NULL;
1022 }
571ecf67
JB		 1023 }
1024
3017b80b 1025 if (rx->key) {
95acac61
JB		 1026 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1027 return RX_DROP_MONITOR;
1028
571ecf67 1029 rx->key->tx_rx_count++;
011bfcc4 1030 /* TODO: add threshold stuff again */
1990af8d 1031 } else {
e4c26add 1032 return RX_DROP_MONITOR;
70f08765
JB		 1033 }
1034
39184b15
ZY		 1035 if (skb_linearize(rx->skb))
1036 return RX_DROP_UNUSABLE;
761ab470 1037 /* the hdr variable is invalid now! */
1990af8d 1038
97359d12
JB		 1039 switch (rx->key->conf.cipher) {
1040 case WLAN_CIPHER_SUITE_WEP40:
1041 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1042 /* Check for weak IVs if possible */
1043 if (rx->sta && ieee80211_is_data(fc) &&
1044 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1045 !(status->flag & RX_FLAG_DECRYPTED)) &&
1046 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1047 rx->sta->wep_weak_iv_count++;
1048
e2f036da
MN		 1049 result = ieee80211_crypto_wep_decrypt(rx);
1050 break;
97359d12 1051 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1052 result = ieee80211_crypto_tkip_decrypt(rx);
1053 break;
97359d12 1054 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1055 result = ieee80211_crypto_ccmp_decrypt(rx);
1056 break;
97359d12 1057 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1058 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1059 break;
3ffc2a90
JB		 1060 default:
1061 /*
1062 * We can reach here only with HW-only algorithms
1063 * but why didn't it decrypt the frame?!
1064 */
1065 return RX_DROP_UNUSABLE;
70f08765
JB		 1066 }
1067
e2f036da 1068 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1069 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1070
1071 return result;
70f08765
JB		 1072}
1073
572e0012
KV		 1074static ieee80211_rx_result debug_noinline
1075ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1076{
1077 struct ieee80211_local *local;
1078 struct ieee80211_hdr *hdr;
1079 struct sk_buff *skb;
1080
1081 local = rx->local;
1082 skb = rx->skb;
1083 hdr = (struct ieee80211_hdr *) skb->data;
1084
1085 if (!local->pspolling)
1086 return RX_CONTINUE;
1087
1088 if (!ieee80211_has_fromds(hdr->frame_control))
1089 /* this is not from AP */
1090 return RX_CONTINUE;
1091
1092 if (!ieee80211_is_data(hdr->frame_control))
1093 return RX_CONTINUE;
1094
1095 if (!ieee80211_has_moredata(hdr->frame_control)) {
1096 /* AP has no more frames buffered for us */
1097 local->pspolling = false;
1098 return RX_CONTINUE;
1099 }
1100
1101 /* more data bit is set, let's request a new frame from the AP */
1102 ieee80211_send_pspoll(local, rx->sdata);
1103
1104 return RX_CONTINUE;
1105}
1106
133b8226 1107static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1108{
133b8226 1109 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1110 struct ieee80211_local *local = sdata->local;
0795af57 1111
3e122be0 1112 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1113 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1114 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1115 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1116#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1117 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1118 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1119#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1120}
1121
ff9458d3 1122static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1123{
133b8226 1124 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1125
3e122be0 1126 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1127
571ecf67 1128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1129 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1130 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1131#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1132
af818581 1133 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1134#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1135 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1136 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1137#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1138 return;
1139 }
1140
1141 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1142}
1143
d057e5a3
AN		 1144int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1145{
1146 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1147 bool in_ps;
1148
1149 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1150
1151 /* Don't let the same PS state be set twice */
1152 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1153 if ((start && in_ps) || (!start && !in_ps))
1154 return -EINVAL;
1155
1156 if (start)
1157 ap_sta_ps_start(sta_inf);
1158 else
1159 ap_sta_ps_end(sta_inf);
1160
1161 return 0;
1162}
1163EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1164
49461622 1165static ieee80211_rx_result debug_noinline
5cf121c3 1166ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1167{
1168 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1169 struct sk_buff *skb = rx->skb;
1170 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1171 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1172
1173 if (!sta)
9ae54c84 1174 return RX_CONTINUE;
571ecf67 1175
b291ba11
JB		 1176 /*
1177 * Update last_rx only for IBSS packets which are for the current
1178 * BSSID to avoid keeping the current IBSS network alive in cases
1179 * where other STAs start using different BSSID.
1180 */
05c914fe 1181 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1182 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1183 NL80211_IFTYPE_ADHOC);
3af6334c 1184 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1185 sta->last_rx = jiffies;
3af6334c
FF		 1186 if (ieee80211_is_data(hdr->frame_control)) {
1187 sta->last_rx_rate_idx = status->rate_idx;
1188 sta->last_rx_rate_flag = status->flag;
1189 }
1190 }
b291ba11
JB		 1191 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1192 /*
33b64eb2
LCC		 1193 * Mesh beacons will update last_rx when if they are found to
1194 * match the current local configuration when processed.
571ecf67 1195 */
b291ba11 1196 sta->last_rx = jiffies;
3af6334c
FF		 1197 if (ieee80211_is_data(hdr->frame_control)) {
1198 sta->last_rx_rate_idx = status->rate_idx;
1199 sta->last_rx_rate_flag = status->flag;
1200 }
571ecf67
JB		 1201 }
1202
554891e6 1203 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1204 return RX_CONTINUE;
571ecf67 1205
3cf335d5
KV		 1206 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1207 ieee80211_sta_rx_notify(rx->sdata, hdr);
1208
571ecf67
JB		 1209 sta->rx_fragments++;
1210 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1211 sta->last_signal = status->signal;
541a45a1 1212 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1213
72eaa43a
JB		 1214 /*
1215 * Change STA power saving mode only at the end of a frame
1216 * exchange sequence.
1217 */
d057e5a3
AN		 1218 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1219 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1220 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1221 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1222 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1223 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1224 /*
1225 * Ignore doze->wake transitions that are
1226 * indicated by non-data frames, the standard
1227 * is unclear here, but for example going to
1228 * PS mode and then scanning would cause a
1229 * doze->wake transition for the probe request,
1230 * and that is clearly undesirable.
1231 */
1232 if (ieee80211_is_data(hdr->frame_control) &&
1233 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1234 ap_sta_ps_end(sta);
72eaa43a
JB		 1235 } else {
1236 if (ieee80211_has_pm(hdr->frame_control))
1237 ap_sta_ps_start(sta);
1238 }
571ecf67
JB		 1239 }
1240
22403def
JB		 1241 /*
1242 * Drop (qos-)data::nullfunc frames silently, since they
1243 * are used only to control station power saving mode.
1244 */
1245 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1246 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1247 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1248
1249 /*
1250 * If we receive a 4-addr nullfunc frame from a STA
1251 * that was not moved to a 4-addr STA vlan yet, drop
1252 * the frame to the monitor interface, to make sure
1253 * that hostapd sees it
1254 */
1255 if (ieee80211_has_a4(hdr->frame_control) &&
1256 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1257 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1258 !rx->sdata->u.vlan.sta)))
1259 return RX_DROP_MONITOR;
22403def
JB		 1260 /*
1261 * Update counter and free packet here to avoid
1262 * counting this as a dropped packed.
1263 */
571ecf67
JB		 1264 sta->rx_packets++;
1265 dev_kfree_skb(rx->skb);
9ae54c84 1266 return RX_QUEUED;
571ecf67
JB		 1267 }
1268
9ae54c84 1269 return RX_CONTINUE;
571ecf67
JB		 1270} /* ieee80211_rx_h_sta_process */
1271
571ecf67
JB		 1272static inline struct ieee80211_fragment_entry *
1273ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1274 unsigned int frag, unsigned int seq, int rx_queue,
1275 struct sk_buff **skb)
1276{
1277 struct ieee80211_fragment_entry *entry;
1278 int idx;
1279
1280 idx = sdata->fragment_next;
1281 entry = &sdata->fragments[sdata->fragment_next++];
1282 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1283 sdata->fragment_next = 0;
1284
1285 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1286#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1287 struct ieee80211_hdr *hdr =
1288 (struct ieee80211_hdr *) entry->skb_list.next->data;
1289 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1290 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1291 "addr1=%pM addr2=%pM\n",
47846c9b 1292 sdata->name, idx,
571ecf67 1293 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1294 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1295#endif
571ecf67
JB		 1296 __skb_queue_purge(&entry->skb_list);
1297 }
1298
1299 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1300 *skb = NULL;
1301 entry->first_frag_time = jiffies;
1302 entry->seq = seq;
1303 entry->rx_queue = rx_queue;
1304 entry->last_frag = frag;
1305 entry->ccmp = 0;
1306 entry->extra_len = 0;
1307
1308 return entry;
1309}
1310
1311static inline struct ieee80211_fragment_entry *
1312ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1313 unsigned int frag, unsigned int seq,
571ecf67
JB		 1314 int rx_queue, struct ieee80211_hdr *hdr)
1315{
1316 struct ieee80211_fragment_entry *entry;
1317 int i, idx;
1318
1319 idx = sdata->fragment_next;
1320 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1321 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1322
1323 idx--;
1324 if (idx < 0)
1325 idx = IEEE80211_FRAGMENT_MAX - 1;
1326
1327 entry = &sdata->fragments[idx];
1328 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1329 entry->rx_queue != rx_queue ||
1330 entry->last_frag + 1 != frag)
1331 continue;
1332
b73d70ad 1333 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1334
b73d70ad
HH		 1335 /*
1336 * Check ftype and addresses are equal, else check next fragment
1337 */
1338 if (((hdr->frame_control ^ f_hdr->frame_control) &
1339 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1340 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1341 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1342 continue;
1343
ab46623e 1344 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1345 __skb_queue_purge(&entry->skb_list);
1346 continue;
1347 }
1348 return entry;
1349 }
1350
1351 return NULL;
1352}
1353
49461622 1354static ieee80211_rx_result debug_noinline
5cf121c3 1355ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1356{
1357 struct ieee80211_hdr *hdr;
1358 u16 sc;
358c8d9d 1359 __le16 fc;
571ecf67
JB		 1360 unsigned int frag, seq;
1361 struct ieee80211_fragment_entry *entry;
1362 struct sk_buff *skb;
554891e6 1363 struct ieee80211_rx_status *status;
571ecf67 1364
b73d70ad 1365 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1366 fc = hdr->frame_control;
571ecf67
JB		 1367 sc = le16_to_cpu(hdr->seq_ctrl);
1368 frag = sc & IEEE80211_SCTL_FRAG;
1369
358c8d9d 1370 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1371 (rx->skb)->len < 24 ||
1372 is_multicast_ether_addr(hdr->addr1))) {
1373 /* not fragmented */
1374 goto out;
1375 }
1376 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1377
e3cf8b3f
ZY		 1378 if (skb_linearize(rx->skb))
1379 return RX_DROP_UNUSABLE;
1380
058897a4
AK		 1381 /*
1382 * skb_linearize() might change the skb->data and
1383 * previously cached variables (in this case, hdr) need to
1384 * be refreshed with the new data.
1385 */
1386 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1387 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1388
1389 if (frag == 0) {
1390 /* This is the first fragment of a new frame. */
1391 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1392 rx->seqno_idx, &(rx->skb));
97359d12 1393 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1394 ieee80211_has_protected(fc)) {
9e26297a 1395 int queue = rx->security_idx;
571ecf67
JB		 1396 /* Store CCMP PN so that we can verify that the next
1397 * fragment has a sequential PN value. */
1398 entry->ccmp = 1;
1399 memcpy(entry->last_pn,
9190252c 1400 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1401 CCMP_PN_LEN);
1402 }
9ae54c84 1403 return RX_QUEUED;
571ecf67
JB		 1404 }
1405
1406 /* This is a fragment for a frame that should already be pending in
1407 * fragment cache. Add this fragment to the end of the pending entry.
1408 */
9e26297a
JB		 1409 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1410 rx->seqno_idx, hdr);
571ecf67
JB		 1411 if (!entry) {
1412 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1413 return RX_DROP_MONITOR;
571ecf67
JB		 1414 }
1415
1416 /* Verify that MPDUs within one MSDU have sequential PN values.
1417 * (IEEE 802.11i, 8.3.3.4.5) */
1418 if (entry->ccmp) {
1419 int i;
1420 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1421 int queue;
97359d12 1422 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1423 return RX_DROP_UNUSABLE;
571ecf67
JB		 1424 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1425 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1426 pn[i]++;
1427 if (pn[i])
1428 break;
1429 }
9e26297a 1430 queue = rx->security_idx;
9190252c 1431 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1432 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1433 return RX_DROP_UNUSABLE;
571ecf67
JB		 1434 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1435 }
1436
358c8d9d 1437 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1438 __skb_queue_tail(&entry->skb_list, rx->skb);
1439 entry->last_frag = frag;
1440 entry->extra_len += rx->skb->len;
358c8d9d 1441 if (ieee80211_has_morefrags(fc)) {
571ecf67 1442 rx->skb = NULL;
9ae54c84 1443 return RX_QUEUED;
571ecf67
JB		 1444 }
1445
1446 rx->skb = __skb_dequeue(&entry->skb_list);
1447 if (skb_tailroom(rx->skb) < entry->extra_len) {
1448 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1449 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1450 GFP_ATOMIC))) {
1451 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1452 __skb_queue_purge(&entry->skb_list);
e4c26add 1453 return RX_DROP_UNUSABLE;
571ecf67
JB		 1454 }
1455 }
1456 while ((skb = __skb_dequeue(&entry->skb_list))) {
1457 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1458 dev_kfree_skb(skb);
1459 }
1460
1461 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1462 status = IEEE80211_SKB_RXCB(rx->skb);
1463 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1464
1465 out:
1466 if (rx->sta)
1467 rx->sta->rx_packets++;
1468 if (is_multicast_ether_addr(hdr->addr1))
1469 rx->local->dot11MulticastReceivedFrameCount++;
1470 else
1471 ieee80211_led_rx(rx->local);
9ae54c84 1472 return RX_CONTINUE;
571ecf67
JB		 1473}
1474
49461622 1475static ieee80211_rx_result debug_noinline
5cf121c3 1476ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1477{
af818581 1478 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1479 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1480 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1481
358c8d9d 1482 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1483 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1484 return RX_CONTINUE;
571ecf67 1485
05c914fe
JB		 1486 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1487 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1488 return RX_DROP_UNUSABLE;
98f0b0a3 1489
af818581
JB		 1490 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1491 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1492 else
1493 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1494
9ae54c84 1495 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1496 * count as an dropped frame. */
1497 dev_kfree_skb(rx->skb);
1498
9ae54c84 1499 return RX_QUEUED;
571ecf67
JB		 1500}
1501
49461622 1502static ieee80211_rx_result debug_noinline
5cf121c3 1503ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1504{
6e0d114d 1505 u8 *data = rx->skb->data;
238f74a2 1506 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1507
238f74a2 1508 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1509 return RX_CONTINUE;
6e0d114d
JB		 1510
1511 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1512 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1513 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1514 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1515 /* change frame type to non QOS */
238f74a2 1516 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1517
9ae54c84 1518 return RX_CONTINUE;
6e0d114d
JB		 1519}
1520
76ee65bf 1521static int
5cf121c3 1522ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1523{
07346f81 1524 if (unlikely(!rx->sta ||
f4ea83dd 1525 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1526 return -EACCES;
571ecf67 1527
76ee65bf 1528 return 0;
571ecf67
JB		 1529}
1530
76ee65bf 1531static int
358c8d9d 1532ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1533{
eb9fb5b8
JB		 1534 struct sk_buff *skb = rx->skb;
1535 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1536
3017b80b 1537 /*
7848ba7d
JB		 1538 * Pass through unencrypted frames if the hardware has
1539 * decrypted them already.
3017b80b 1540 */
eb9fb5b8 1541 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1542 return 0;
571ecf67
JB		 1543
1544 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1545 if (unlikely(!ieee80211_has_protected(fc) &&
1546 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1547 ieee80211_is_data(fc) &&
b3fc9c6c 1548 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1549 return -EACCES;
bef5d1c7
JB		 1550
1551 return 0;
1552}
1553
1554static int
1555ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1556{
1557 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1558 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1559 __le16 fc = hdr->frame_control;
bef5d1c7 1560
e3efca0a
JM		 1561 /*
1562 * Pass through unencrypted frames if the hardware has
1563 * decrypted them already.
1564 */
1565 if (status->flag & RX_FLAG_DECRYPTED)
1566 return 0;
bef5d1c7 1567
f2ca3ea4 1568 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1569 if (unlikely(!ieee80211_has_protected(fc) &&
1570 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1571 rx->key)) {
1572 if (ieee80211_is_deauth(fc))
1573 cfg80211_send_unprot_deauth(rx->sdata->dev,
1574 rx->skb->data,
1575 rx->skb->len);
1576 else if (ieee80211_is_disassoc(fc))
1577 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1578 rx->skb->data,
1579 rx->skb->len);
f2ca3ea4 1580 return -EACCES;
cf4e594e 1581 }
f2ca3ea4 1582 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1583 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1584 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1585 if (ieee80211_is_deauth(fc))
1586 cfg80211_send_unprot_deauth(rx->sdata->dev,
1587 rx->skb->data,
1588 rx->skb->len);
1589 else if (ieee80211_is_disassoc(fc))
1590 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1591 rx->skb->data,
1592 rx->skb->len);
f2ca3ea4 1593 return -EACCES;
cf4e594e 1594 }
f2ca3ea4
JM		 1595 /*
1596 * When using MFP, Action frames are not allowed prior to
1597 * having configured keys.
1598 */
1599 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1600 ieee80211_is_robust_mgmt_frame(
1601 (struct ieee80211_hdr *) rx->skb->data)))
1602 return -EACCES;
1603 }
b3fc9c6c 1604
76ee65bf 1605 return 0;
571ecf67
JB		 1606}
1607
76ee65bf 1608static int
4114fa21 1609__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1610{
eb9fb5b8 1611 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1613 bool check_port_control = false;
1614 struct ethhdr *ehdr;
1615 int ret;
f14543ee 1616
4114fa21 1617 *port_control = false;
9bc383de
JB		 1618 if (ieee80211_has_a4(hdr->frame_control) &&
1619 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1620 return -1;
9bc383de 1621
fbb327c5
FF		 1622 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1623 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1624
1625 if (!sdata->u.mgd.use_4addr)
1626 return -1;
1627 else
1628 check_port_control = true;
1629 }
1630
9bc383de 1631 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1632 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1633 return -1;
571ecf67 1634
fbb327c5 1635 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1636 if (ret < 0)
fbb327c5
FF		 1637 return ret;
1638
1639 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1640 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1641 *port_control = true;
1642 else if (check_port_control)
fbb327c5
FF		 1643 return -1;
1644
1645 return 0;
76ee65bf 1646}
571ecf67 1647
ce3edf6d
JB		 1648/*
1649 * requires that rx->skb is a frame with ethernet header
1650 */
358c8d9d 1651static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1652{
c97c23e3 1653 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1654 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1655 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1656
1657 /*
1658 * Allow EAPOL frames to us/the PAE group address regardless
1659 * of whether the frame was encrypted or not.
1660 */
a621fa4d 1661 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1662 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1663 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1664 return true;
1665
1666 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1667 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1668 return false;
1669
1670 return true;
1671}
1672
1673/*
1674 * requires that rx->skb is a frame with ethernet header
1675 */
76ee65bf 1676static void
5cf121c3 1677ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1678{
eb9fb5b8
JB		 1679 struct ieee80211_sub_if_data *sdata = rx->sdata;
1680 struct net_device *dev = sdata->dev;
76ee65bf 1681 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1682 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1683 struct sta_info *dsta;
554891e6 1684 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1685
76ee65bf
RR		 1686 skb = rx->skb;
1687 xmit_skb = NULL;
571ecf67 1688
05c914fe
JB		 1689 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1690 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1691 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1692 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1693 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1694 if (is_multicast_ether_addr(ehdr->h_dest)) {
1695 /*
1696 * send multicast frames both to higher layers in
1697 * local net stack and back to the wireless medium
1698 */
76ee65bf
RR		 1699 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1700 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1701 printk(KERN_DEBUG "%s: failed to clone "
1702 "multicast frame\n", dev->name);
1703 } else {
abe60632
JB		 1704 dsta = sta_info_get(sdata, skb->data);
1705 if (dsta) {
ce3edf6d
JB		 1706 /*
1707 * The destination station is associated to
1708 * this AP (in this VLAN), so send the frame
1709 * directly to it and do not pass it to local
1710 * net stack.
571ecf67 1711 */
76ee65bf 1712 xmit_skb = skb;
571ecf67
JB		 1713 skb = NULL;
1714 }
571ecf67
JB		 1715 }
1716 }
1717
1718 if (skb) {
d1c3a37c
JB		 1719 int align __maybe_unused;
1720
59d9cb07 1721#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1722 /*
1723 * 'align' will only take the values 0 or 2 here
1724 * since all frames are required to be aligned
1725 * to 2-byte boundaries when being passed to
1726 * mac80211. That also explains the __skb_push()
1727 * below.
1728 */
dacb6f1d 1729 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1730 if (align) {
1731 if (WARN_ON(skb_headroom(skb) < 3)) {
1732 dev_kfree_skb(skb);
1733 skb = NULL;
1734 } else {
1735 u8 *data = skb->data;
8ce0b589
ZY		 1736 size_t len = skb_headlen(skb);
1737 skb->data -= align;
1738 memmove(skb->data, data, len);
1739 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1740 }
1741 }
1742#endif
1743
1744 if (skb) {
1745 /* deliver to local stack */
1746 skb->protocol = eth_type_trans(skb, dev);
1747 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1748 netif_receive_skb(skb);
d1c3a37c 1749 }
571ecf67
JB		 1750 }
1751
76ee65bf 1752 if (xmit_skb) {
571ecf67 1753 /* send to wireless media */
f831e909 1754 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1755 skb_reset_network_header(xmit_skb);
1756 skb_reset_mac_header(xmit_skb);
76ee65bf 1757 dev_queue_xmit(xmit_skb);
571ecf67 1758 }
76ee65bf
RR		 1759}
1760
49461622 1761static ieee80211_rx_result debug_noinline
5cf121c3 1762ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1763{
eb9fb5b8 1764 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1765 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1766 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1767 __le16 fc = hdr->frame_control;
eaf85ca7 1768 struct sk_buff_head frame_list;
554891e6 1769 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1770
358c8d9d 1771 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1772 return RX_CONTINUE;
fd4c7f2f 1773
358c8d9d 1774 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1775 return RX_DROP_MONITOR;
fd4c7f2f 1776
554891e6 1777 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1778 return RX_CONTINUE;
fd4c7f2f 1779
eaf85ca7
ZY		 1780 if (ieee80211_has_a4(hdr->frame_control) &&
1781 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1782 !rx->sdata->u.vlan.sta)
e4c26add 1783 return RX_DROP_UNUSABLE;
fd4c7f2f 1784
eaf85ca7
ZY		 1785 if (is_multicast_ether_addr(hdr->addr1) &&
1786 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1787 rx->sdata->u.vlan.sta) ||
1788 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1789 rx->sdata->u.mgd.use_4addr)))
e4c26add 1790 return RX_DROP_UNUSABLE;
fd4c7f2f 1791
eaf85ca7
ZY		 1792 skb->dev = dev;
1793 __skb_queue_head_init(&frame_list);
fd4c7f2f 1794
e3cf8b3f
ZY		 1795 if (skb_linearize(skb))
1796 return RX_DROP_UNUSABLE;
1797
eaf85ca7
ZY		 1798 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1799 rx->sdata->vif.type,
8b3becad 1800 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1801
eaf85ca7
ZY		 1802 while (!skb_queue_empty(&frame_list)) {
1803 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1804
358c8d9d 1805 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1806 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1807 continue;
1808 }
eaf85ca7
ZY		 1809 dev->stats.rx_packets++;
1810 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1811
1812 ieee80211_deliver_skb(rx);
1813 }
1814
9ae54c84 1815 return RX_QUEUED;
fd4c7f2f
RR		 1816}
1817
bf94e17b 1818#ifdef CONFIG_MAC80211_MESH
b0dee578 1819static ieee80211_rx_result
e32f85f7
LCC		 1820ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1821{
1822 struct ieee80211_hdr *hdr;
1823 struct ieee80211s_hdr *mesh_hdr;
1824 unsigned int hdrlen;
1825 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1826 struct ieee80211_local *local = rx->local;
eb9fb5b8 1827 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1829
1830 hdr = (struct ieee80211_hdr *) skb->data;
1831 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1832 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1833
2157fdd6
TP		 1834 /* frame is in RMC, don't forward */
1835 if (ieee80211_is_data(hdr->frame_control) &&
1836 is_multicast_ether_addr(hdr->addr1) &&
1837 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1838 return RX_DROP_MONITOR;
1839
e32f85f7
LCC		 1840 if (!ieee80211_is_data(hdr->frame_control))
1841 return RX_CONTINUE;
1842
1843 if (!mesh_hdr->ttl)
1844 /* illegal frame */
1845 return RX_DROP_MONITOR;
1846
cfee66b0
JC		 1847 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1848 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1849 dropped_frames_congestion);
1850 return RX_DROP_MONITOR;
1851 }
1852
43b7b314 1853 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1854 struct mesh_path *mppath;
43b7b314
JC		 1855 char *proxied_addr;
1856 char *mpp_addr;
1857
1858 if (is_multicast_ether_addr(hdr->addr1)) {
1859 mpp_addr = hdr->addr3;
1860 proxied_addr = mesh_hdr->eaddr1;
1861 } else {
1862 mpp_addr = hdr->addr4;
1863 proxied_addr = mesh_hdr->eaddr2;
1864 }
79617dee 1865
79617dee 1866 rcu_read_lock();
43b7b314 1867 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1868 if (!mppath) {
43b7b314 1869 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1870 } else {
1871 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1872 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1873 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1874 spin_unlock_bh(&mppath->state_lock);
1875 }
1876 rcu_read_unlock();
1877 }
1878
3c5772a5
JC		 1879 /* Frame has reached destination. Don't forward */
1880 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1881 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1882 return RX_CONTINUE;
1883
1884 mesh_hdr->ttl--;
1885
554891e6 1886 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1887 if (!mesh_hdr->ttl)
472dbc45 1888 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1889 dropped_frames_ttl);
1890 else {
1891 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1892 struct ieee80211_tx_info *info;
1893
e32f85f7
LCC		 1894 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1895
1896 if (!fwd_skb && net_ratelimit())
1897 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1898 sdata->name);
919bbad5 1899 if (!fwd_skb)
b51aff05 1900 goto out;
e32f85f7
LCC		 1901
1902 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1903 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1904 info = IEEE80211_SKB_CB(fwd_skb);
1905 memset(info, 0, sizeof(*info));
1906 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1907 info->control.vif = &rx->sdata->vif;
4777be41 1908 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
c8a61a7d
DW		 1909 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1910 fwded_mcast);
4777be41
JC		 1911 skb_set_queue_mapping(fwd_skb,
1912 ieee80211_select_queue(sdata, fwd_skb));
2154c81c 1913 ieee80211_set_qos_hdr(sdata, fwd_skb);
4777be41 1914 } else {
3c5772a5
JC		 1915 int err;
1916 /*
1917 * Save TA to addr1 to send TA a path error if a
1918 * suitable next hop is not found
1919 */
1920 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1921 ETH_ALEN);
3c5772a5 1922 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1923 /* Failed to immediately resolve next hop:
1924 * fwded frame was dropped or will be added
1925 * later to the pending skb queue. */
1926 if (err)
1927 return RX_DROP_MONITOR;
c8a61a7d
DW		 1928
1929 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1930 fwded_unicast);
249b405c
JC		 1931 }
1932 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1933 fwded_frames);
3b8d81e0 1934 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1935 }
1936 }
1937
b51aff05 1938 out:
3c5772a5 1939 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1940 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1941 return RX_CONTINUE;
1942 else
1943 return RX_DROP_MONITOR;
1944}
bf94e17b 1945#endif
e32f85f7 1946
49461622 1947static ieee80211_rx_result debug_noinline
5cf121c3 1948ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1949{
eb9fb5b8 1950 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1951 struct ieee80211_local *local = rx->local;
eb9fb5b8 1952 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1953 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1954 __le16 fc = hdr->frame_control;
4114fa21 1955 bool port_control;
ce3edf6d 1956 int err;
76ee65bf 1957
358c8d9d 1958 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1959 return RX_CONTINUE;
76ee65bf 1960
358c8d9d 1961 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1962 return RX_DROP_MONITOR;
76ee65bf 1963
f14543ee
FF		 1964 /*
1965 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1966 * that a 4-addr station can be detected and moved into a separate VLAN
1967 */
1968 if (ieee80211_has_a4(hdr->frame_control) &&
1969 sdata->vif.type == NL80211_IFTYPE_AP)
1970 return RX_DROP_MONITOR;
1971
4114fa21 1972 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1973 if (unlikely(err))
e4c26add 1974 return RX_DROP_UNUSABLE;
76ee65bf 1975
358c8d9d 1976 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1977 return RX_DROP_MONITOR;
ce3edf6d 1978
4114fa21
FF		 1979 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1980 unlikely(port_control) && sdata->bss) {
1981 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1982 u.ap);
1983 dev = sdata->dev;
1984 rx->sdata = sdata;
1985 }
1986
76ee65bf
RR		 1987 rx->skb->dev = dev;
1988
1989 dev->stats.rx_packets++;
1990 dev->stats.rx_bytes += rx->skb->len;
1991
08ca944e 1992 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1993 !is_multicast_ether_addr(
1994 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1995 (!local->scanning &&
1996 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1997 mod_timer(&local->dynamic_ps_timer, jiffies +
1998 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1999 }
2000
76ee65bf 2001 ieee80211_deliver_skb(rx);
571ecf67 2002
9ae54c84 2003 return RX_QUEUED;
571ecf67
JB		 2004}
2005
49461622 2006static ieee80211_rx_result debug_noinline
24a8fdad 2007ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2008{
2009 struct ieee80211_local *local = rx->local;
2010 struct ieee80211_hw *hw = &local->hw;
2011 struct sk_buff *skb = rx->skb;
a7767f95 2012 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2013 struct tid_ampdu_rx *tid_agg_rx;
2014 u16 start_seq_num;
2015 u16 tid;
2016
a7767f95 2017 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2018 return RX_CONTINUE;
71364716 2019
a7767f95 2020 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2021 struct {
2022 __le16 control, start_seq_num;
2023 } __packed bar_data;
2024
71364716 2025 if (!rx->sta)
a02ae758 2026 return RX_DROP_MONITOR;
8ae5977f
JB		 2027
2028 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2029 &bar_data, sizeof(bar_data)))
2030 return RX_DROP_MONITOR;
2031
8ae5977f 2032 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2033
2034 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2035 if (!tid_agg_rx)
a02ae758 2036 return RX_DROP_MONITOR;
71364716 2037
8ae5977f 2038 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2039
2040 /* reset session timer */
20ad19d0
JB		 2041 if (tid_agg_rx->timeout)
2042 mod_timer(&tid_agg_rx->session_timer,
2043 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2044
dd318575 2045 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2046 /* release stored frames up to start of BAR */
24a8fdad 2047 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2048 spin_unlock(&tid_agg_rx->reorder_lock);
2049
a02ae758
JB		 2050 kfree_skb(skb);
2051 return RX_QUEUED;
71364716
RR		 2052 }
2053
08daecae
JB		 2054 /*
2055 * After this point, we only want management frames,
2056 * so we can drop all remaining control frames to
2057 * cooked monitor interfaces.
2058 */
2059 return RX_DROP_MONITOR;
71364716
RR		 2060}
2061
f4f727a6
JM		 2062static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2063 struct ieee80211_mgmt *mgmt,
2064 size_t len)
fea14732
JM		 2065{
2066 struct ieee80211_local *local = sdata->local;
2067 struct sk_buff *skb;
2068 struct ieee80211_mgmt *resp;
2069
47846c9b 2070 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2071 /* Not to own unicast address */
2072 return;
2073 }
2074
46900298
JB		 2075 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2076 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2077 /* Not from the current AP or not associated yet. */
fea14732
JM		 2078 return;
2079 }
2080
2081 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2082 /* Too short SA Query request frame */
2083 return;
2084 }
2085
2086 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2087 if (skb == NULL)
2088 return;
2089
2090 skb_reserve(skb, local->hw.extra_tx_headroom);
2091 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2092 memset(resp, 0, 24);
2093 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2094 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2095 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2096 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2097 IEEE80211_STYPE_ACTION);
2098 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2099 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2100 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2101 memcpy(resp->u.action.u.sa_query.trans_id,
2102 mgmt->u.action.u.sa_query.trans_id,
2103 WLAN_SA_QUERY_TR_ID_LEN);
2104
62ae67be 2105 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2106}
2107
2e161f78
JB		 2108static ieee80211_rx_result debug_noinline
2109ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2110{
2111 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2112 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2113
2114 /*
2115 * From here on, look only at management frames.
2116 * Data and control frames are already handled,
2117 * and unknown (reserved) frames are useless.
2118 */
2119 if (rx->skb->len < 24)
2120 return RX_DROP_MONITOR;
2121
2122 if (!ieee80211_is_mgmt(mgmt->frame_control))
2123 return RX_DROP_MONITOR;
2124
554891e6 2125 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2126 return RX_DROP_MONITOR;
2127
2128 if (ieee80211_drop_unencrypted_mgmt(rx))
2129 return RX_DROP_UNUSABLE;
2130
2131 return RX_CONTINUE;
2132}
2133
de1ede7a
JB		 2134static ieee80211_rx_result debug_noinline
2135ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2136{
2137 struct ieee80211_local *local = rx->local;
eb9fb5b8 2138 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2139 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2140 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2141 int len = rx->skb->len;
2142
2143 if (!ieee80211_is_action(mgmt->frame_control))
2144 return RX_CONTINUE;
2145
026331c4
JM		 2146 /* drop too small frames */
2147 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2148 return RX_DROP_UNUSABLE;
de1ede7a 2149
026331c4 2150 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2151 return RX_DROP_UNUSABLE;
de1ede7a 2152
554891e6 2153 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2154 return RX_DROP_UNUSABLE;
97ebe12a 2155
de1ede7a
JB		 2156 switch (mgmt->u.action.category) {
2157 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2158 /*
2159 * The aggregation code is not prepared to handle
2160 * anything but STA/AP due to the BSSID handling;
2161 * IBSS could work in the code but isn't supported
2162 * by drivers or the standard.
2163 */
2164 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2165 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2166 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2167 break;
8abd3f9b 2168
026331c4
JM		 2169 /* verify action_code is present */
2170 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2171 break;
2172
de1ede7a
JB		 2173 switch (mgmt->u.action.u.addba_req.action_code) {
2174 case WLAN_ACTION_ADDBA_REQ:
2175 if (len < (IEEE80211_MIN_ACTION_SIZE +
2176 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2177 goto invalid;
2178 break;
de1ede7a
JB		 2179 case WLAN_ACTION_ADDBA_RESP:
2180 if (len < (IEEE80211_MIN_ACTION_SIZE +
2181 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2182 goto invalid;
2183 break;
de1ede7a
JB		 2184 case WLAN_ACTION_DELBA:
2185 if (len < (IEEE80211_MIN_ACTION_SIZE +
2186 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2187 goto invalid;
2188 break;
2189 default:
2190 goto invalid;
de1ede7a 2191 }
bed7ee6e 2192
8b58ff83 2193 goto queue;
39192c0b
JB		 2194 case WLAN_CATEGORY_SPECTRUM_MGMT:
2195 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2196 break;
46900298
JB		 2197
2198 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2199 break;
46900298 2200
026331c4
JM		 2201 /* verify action_code is present */
2202 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2203 break;
2204
39192c0b
JB		 2205 switch (mgmt->u.action.u.measurement.action_code) {
2206 case WLAN_ACTION_SPCT_MSR_REQ:
2207 if (len < (IEEE80211_MIN_ACTION_SIZE +
2208 sizeof(mgmt->u.action.u.measurement)))
84040805 2209 break;
39192c0b 2210 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2211 goto handled;
c481ec97
S		 2212 case WLAN_ACTION_SPCT_CHL_SWITCH:
2213 if (len < (IEEE80211_MIN_ACTION_SIZE +
2214 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2215 break;
c481ec97 2216
cc32abd4 2217 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2218 break;
cc32abd4 2219
46900298 2220 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2221 break;
c481ec97 2222
8b58ff83 2223 goto queue;
39192c0b
JB		 2224 }
2225 break;
fea14732
JM		 2226 case WLAN_CATEGORY_SA_QUERY:
2227 if (len < (IEEE80211_MIN_ACTION_SIZE +
2228 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2229 break;
2230
fea14732
JM		 2231 switch (mgmt->u.action.u.sa_query.action) {
2232 case WLAN_ACTION_SA_QUERY_REQUEST:
2233 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2234 break;
fea14732 2235 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2236 goto handled;
fea14732
JM		 2237 }
2238 break;
8db09850
TP		 2239 case WLAN_CATEGORY_SELF_PROTECTED:
2240 switch (mgmt->u.action.u.self_prot.action_code) {
2241 case WLAN_SP_MESH_PEERING_OPEN:
2242 case WLAN_SP_MESH_PEERING_CLOSE:
2243 case WLAN_SP_MESH_PEERING_CONFIRM:
2244 if (!ieee80211_vif_is_mesh(&sdata->vif))
2245 goto invalid;
2246 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2247 /* userspace handles this frame */
2248 break;
2249 goto queue;
2250 case WLAN_SP_MGK_INFORM:
2251 case WLAN_SP_MGK_ACK:
2252 if (!ieee80211_vif_is_mesh(&sdata->vif))
2253 goto invalid;
2254 break;
2255 }
2256 break;
d3aaec8a 2257 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2258 if (!ieee80211_vif_is_mesh(&sdata->vif))
2259 break;
25d49e4d
TP		 2260 if (mesh_action_is_path_sel(mgmt) &&
2261 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2262 break;
2263 goto queue;
84040805 2264 }
026331c4 2265
2e161f78
JB		 2266 return RX_CONTINUE;
2267
bed7ee6e 2268 invalid:
554891e6 2269 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2270 /* will return in the next handlers */
2271 return RX_CONTINUE;
2272
2273 handled:
2274 if (rx->sta)
2275 rx->sta->rx_packets++;
2276 dev_kfree_skb(rx->skb);
2277 return RX_QUEUED;
2278
2279 queue:
2280 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2281 skb_queue_tail(&sdata->skb_queue, rx->skb);
2282 ieee80211_queue_work(&local->hw, &sdata->work);
2283 if (rx->sta)
2284 rx->sta->rx_packets++;
2285 return RX_QUEUED;
2286}
2287
2288static ieee80211_rx_result debug_noinline
2289ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2290{
554891e6 2291 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2292
2293 /* skip known-bad action frames and return them in the next handler */
554891e6 2294 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2295 return RX_CONTINUE;
d7907448 2296
026331c4
JM		 2297 /*
2298 * Getting here means the kernel doesn't know how to handle
2299 * it, but maybe userspace does ... include returned frames
2300 * so userspace can register for those to know whether ones
2301 * it transmitted were processed or returned.
2302 */
026331c4 2303
2e161f78
JB		 2304 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2305 rx->skb->data, rx->skb->len,
2306 GFP_ATOMIC)) {
2307 if (rx->sta)
2308 rx->sta->rx_packets++;
2309 dev_kfree_skb(rx->skb);
2310 return RX_QUEUED;
2311 }
2312
2313
2314 return RX_CONTINUE;
2315}
2316
2317static ieee80211_rx_result debug_noinline
2318ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2319{
2320 struct ieee80211_local *local = rx->local;
2321 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2322 struct sk_buff *nskb;
2323 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2324 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2325
2326 if (!ieee80211_is_action(mgmt->frame_control))
2327 return RX_CONTINUE;
2328
2329 /*
2330 * For AP mode, hostapd is responsible for handling any action
2331 * frames that we didn't handle, including returning unknown
2332 * ones. For all other modes we will return them to the sender,
2333 * setting the 0x80 bit in the action category, as required by
2334 * 802.11-2007 7.3.1.11.
2335 * Newer versions of hostapd shall also use the management frame
2336 * registration mechanisms, but older ones still use cooked
2337 * monitor interfaces so push all frames there.
2338 */
554891e6 2339 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2340 (sdata->vif.type == NL80211_IFTYPE_AP ||
2341 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2342 return RX_DROP_MONITOR;
026331c4 2343
84040805
JB		 2344 /* do not return rejected action frames */
2345 if (mgmt->u.action.category & 0x80)
2346 return RX_DROP_UNUSABLE;
2347
2348 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2349 GFP_ATOMIC);
2350 if (nskb) {
292b4df6 2351 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2352
292b4df6
JL		 2353 nmgmt->u.action.category |= 0x80;
2354 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2355 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2356
2357 memset(nskb->cb, 0, sizeof(nskb->cb));
2358
2359 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2360 }
39192c0b
JB		 2361 dev_kfree_skb(rx->skb);
2362 return RX_QUEUED;
de1ede7a
JB		 2363}
2364
49461622 2365static ieee80211_rx_result debug_noinline
5cf121c3 2366ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2367{
eb9fb5b8 2368 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2369 ieee80211_rx_result rxs;
77a121c3
JB		 2370 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2371 __le16 stype;
571ecf67 2372
af6b6374
JB		 2373 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2374 if (rxs != RX_CONTINUE)
2375 return rxs;
2376
77a121c3 2377 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2378
77a121c3
JB		 2379 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2380 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2381 sdata->vif.type != NL80211_IFTYPE_STATION)
2382 return RX_DROP_MONITOR;
472dbc45 2383
77a121c3
JB		 2384 switch (stype) {
2385 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2386 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2387 /* process for all: mesh, mlme, ibss */
2388 break;
2389 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2390 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2391 if (is_multicast_ether_addr(mgmt->da) &&
2392 !is_broadcast_ether_addr(mgmt->da))
2393 return RX_DROP_MONITOR;
2394
77a121c3
JB		 2395 /* process only for station */
2396 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2397 return RX_DROP_MONITOR;
2398 break;
2399 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2400 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2401 /* process only for ibss */
2402 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2403 return RX_DROP_MONITOR;
2404 break;
2405 default:
2406 return RX_DROP_MONITOR;
2407 }
f9d540ee 2408
77a121c3 2409 /* queue up frame and kick off work to process it */
c1475ca9 2410 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2411 skb_queue_tail(&sdata->skb_queue, rx->skb);
2412 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2413 if (rx->sta)
2414 rx->sta->rx_packets++;
46900298 2415
77a121c3 2416 return RX_QUEUED;
571ecf67
JB		 2417}
2418
5cf121c3 2419/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2420static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2421 struct ieee80211_rate *rate)
3d30d949
MW		 2422{
2423 struct ieee80211_sub_if_data *sdata;
2424 struct ieee80211_local *local = rx->local;
2425 struct ieee80211_rtap_hdr {
2426 struct ieee80211_radiotap_header hdr;
2427 u8 flags;
5f0b7de5 2428 u8 rate_or_pad;
3d30d949
MW		 2429 __le16 chan_freq;
2430 __le16 chan_flags;
bc10502d 2431 } __packed *rthdr;
3d30d949
MW		 2432 struct sk_buff *skb = rx->skb, *skb2;
2433 struct net_device *prev_dev = NULL;
eb9fb5b8 2434 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2435
554891e6
JB		 2436 /*
2437 * If cooked monitor has been processed already, then
2438 * don't do it again. If not, set the flag.
2439 */
2440 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2441 goto out_free_skb;
554891e6 2442 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2443
3d30d949
MW		 2444 if (skb_headroom(skb) < sizeof(*rthdr) &&
2445 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2446 goto out_free_skb;
2447
2448 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2449 memset(rthdr, 0, sizeof(*rthdr));
2450 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2451 rthdr->hdr.it_present =
2452 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2453 (1 << IEEE80211_RADIOTAP_CHANNEL));
2454
5f0b7de5
JB		 2455 if (rate) {
2456 rthdr->rate_or_pad = rate->bitrate / 5;
2457 rthdr->hdr.it_present |=
2458 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2459 }
3d30d949
MW		 2460 rthdr->chan_freq = cpu_to_le16(status->freq);
2461
2462 if (status->band == IEEE80211_BAND_5GHZ)
2463 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2464 IEEE80211_CHAN_5GHZ);
2465 else
2466 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2467 IEEE80211_CHAN_2GHZ);
2468
2469 skb_set_mac_header(skb, 0);
2470 skb->ip_summed = CHECKSUM_UNNECESSARY;
2471 skb->pkt_type = PACKET_OTHERHOST;
2472 skb->protocol = htons(ETH_P_802_2);
2473
2474 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2475 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2476 continue;
2477
05c914fe 2478 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2479 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2480 continue;
2481
2482 if (prev_dev) {
2483 skb2 = skb_clone(skb, GFP_ATOMIC);
2484 if (skb2) {
2485 skb2->dev = prev_dev;
5548a8a1 2486 netif_receive_skb(skb2);
3d30d949
MW		 2487 }
2488 }
2489
2490 prev_dev = sdata->dev;
2491 sdata->dev->stats.rx_packets++;
2492 sdata->dev->stats.rx_bytes += skb->len;
2493 }
2494
2495 if (prev_dev) {
2496 skb->dev = prev_dev;
5548a8a1 2497 netif_receive_skb(skb);
554891e6
JB		 2498 return;
2499 }
3d30d949
MW		 2500
2501 out_free_skb:
2502 dev_kfree_skb(skb);
2503}
2504
aa0c8636
CL		 2505static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2506 ieee80211_rx_result res)
2507{
2508 switch (res) {
2509 case RX_DROP_MONITOR:
2510 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2511 if (rx->sta)
2512 rx->sta->rx_dropped++;
2513 /* fall through */
2514 case RX_CONTINUE: {
2515 struct ieee80211_rate *rate = NULL;
2516 struct ieee80211_supported_band *sband;
2517 struct ieee80211_rx_status *status;
2518
2519 status = IEEE80211_SKB_RXCB((rx->skb));
2520
2521 sband = rx->local->hw.wiphy->bands[status->band];
2522 if (!(status->flag & RX_FLAG_HT))
2523 rate = &sband->bitrates[status->rate_idx];
2524
2525 ieee80211_rx_cooked_monitor(rx, rate);
2526 break;
2527 }
2528 case RX_DROP_UNUSABLE:
2529 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2530 if (rx->sta)
2531 rx->sta->rx_dropped++;
2532 dev_kfree_skb(rx->skb);
2533 break;
2534 case RX_QUEUED:
2535 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2536 break;
2537 }
2538}
571ecf67 2539
24a8fdad 2540static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2541{
58905290 2542 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2543 struct sk_buff *skb;
8944b79f 2544
e32f85f7
LCC		 2545#define CALL_RXH(rxh) \
2546 do { \
2547 res = rxh(rx); \
2548 if (res != RX_CONTINUE) \
2569a826 2549 goto rxh_next; \
e32f85f7 2550 } while (0);
49461622 2551
24a8fdad
CL		 2552 spin_lock(&rx->local->rx_skb_queue.lock);
2553 if (rx->local->running_rx_handler)
2554 goto unlock;
2555
2556 rx->local->running_rx_handler = true;
2557
2558 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2559 spin_unlock(&rx->local->rx_skb_queue.lock);
2560
2569a826
JB		 2561 /*
2562 * all the other fields are valid across frames
2563 * that belong to an aMPDU since they are on the
2564 * same TID from the same station
2565 */
2566 rx->skb = skb;
2567
2568 CALL_RXH(ieee80211_rx_h_decrypt)
2569 CALL_RXH(ieee80211_rx_h_check_more_data)
2570 CALL_RXH(ieee80211_rx_h_sta_process)
2571 CALL_RXH(ieee80211_rx_h_defragment)
2572 CALL_RXH(ieee80211_rx_h_ps_poll)
2573 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2574 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2575#ifdef CONFIG_MAC80211_MESH
aa0c8636 2576 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2577 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2578#endif
2154c81c
JC		 2579 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2580 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2581 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2582 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2583 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2584 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2585 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2586 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2587 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2588
aa0c8636
CL		 2589 rxh_next:
2590 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2591 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2592#undef CALL_RXH
aa0c8636 2593 }
24a8fdad
CL		 2594
2595 rx->local->running_rx_handler = false;
2596
2597 unlock:
2598 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2599}
2600
4406c376 2601static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2602{
aa0c8636
CL		 2603 ieee80211_rx_result res = RX_DROP_MONITOR;
2604
aa0c8636
CL		 2605#define CALL_RXH(rxh) \
2606 do { \
2607 res = rxh(rx); \
2608 if (res != RX_CONTINUE) \
2609 goto rxh_next; \
2610 } while (0);
2611
2612 CALL_RXH(ieee80211_rx_h_passive_scan)
2613 CALL_RXH(ieee80211_rx_h_check)
2614
24a8fdad 2615 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2616
24a8fdad 2617 ieee80211_rx_handlers(rx);
aa0c8636 2618 return;
49461622 2619
2569a826 2620 rxh_next:
aa0c8636
CL		 2621 ieee80211_rx_handlers_result(rx, res);
2622
2623#undef CALL_RXH
58905290
JB		 2624}
2625
2bff8ebf 2626/*
dd318575
JB		 2627 * This function makes calls into the RX path, therefore
2628 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2629 */
2630void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2631{
554891e6
JB		 2632 struct ieee80211_rx_data rx = {
2633 .sta = sta,
2634 .sdata = sta->sdata,
2635 .local = sta->local,
9e26297a
JB		 2636 /* This is OK -- must be QoS data frame */
2637 .security_idx = tid,
2638 .seqno_idx = tid,
fcf8bd3b 2639 .flags = 0,
554891e6 2640 };
2c15a0cf
CL		 2641 struct tid_ampdu_rx *tid_agg_rx;
2642
2643 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2644 if (!tid_agg_rx)
2645 return;
2bff8ebf 2646
2c15a0cf 2647 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2648 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2649 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2650
24a8fdad 2651 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2652}
2653
571ecf67
JB		 2654/* main receive path */
2655
20b01f80 2656static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2657 struct ieee80211_hdr *hdr)
2658{
20b01f80 2659 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2660 struct sk_buff *skb = rx->skb;
2661 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2662 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2663 int multicast = is_multicast_ether_addr(hdr->addr1);
2664
51fb61e7 2665 switch (sdata->vif.type) {
05c914fe 2666 case NL80211_IFTYPE_STATION:
9bc383de 2667 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2668 return 0;
77fdaa12 2669 if (!multicast &&
47846c9b 2670 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2671 if (!(sdata->dev->flags & IFF_PROMISC) ||
2672 sdata->u.mgd.use_4addr)
23a24def 2673 return 0;
554891e6 2674 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2675 }
2676 break;
05c914fe 2677 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2678 if (!bssid)
2679 return 0;
a7767f95 2680 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2681 return 1;
87291c02 2682 }
46900298 2683 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2684 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2685 return 0;
554891e6 2686 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2687 } else if (!multicast &&
47846c9b 2688 compare_ether_addr(sdata->vif.addr,
23a24def 2689 hdr->addr1) != 0) {
4150c572 2690 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2691 return 0;
554891e6 2692 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2693 } else if (!rx->sta) {
2694 int rate_idx;
eb9fb5b8 2695 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2696 rate_idx = 0; /* TODO: HT rates */
2697 else
eb9fb5b8 2698 rate_idx = status->rate_idx;
34e89507
JB		 2699 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2700 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2701 }
23a24def 2702 break;
05c914fe 2703 case NL80211_IFTYPE_MESH_POINT:
6032f934 2704 if (!multicast &&
47846c9b 2705 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2706 hdr->addr1) != 0) {
2707 if (!(sdata->dev->flags & IFF_PROMISC))
2708 return 0;
2709
554891e6 2710 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2711 }
2712 break;
05c914fe
JB		 2713 case NL80211_IFTYPE_AP_VLAN:
2714 case NL80211_IFTYPE_AP:
23a24def 2715 if (!bssid) {
47846c9b 2716 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2717 hdr->addr1))
2718 return 0;
2719 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2720 sdata->vif.addr)) {
771bbd09 2721 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2722 !ieee80211_is_beacon(hdr->frame_control) &&
2723 !(ieee80211_is_action(hdr->frame_control) &&
2724 sdata->vif.p2p))
23a24def 2725 return 0;
554891e6 2726 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2727 }
23a24def 2728 break;
05c914fe 2729 case NL80211_IFTYPE_WDS:
a7767f95 2730 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2731 return 0;
2732 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2733 return 0;
2734 break;
2ca27bcf 2735 default:
fb1c1cd6
JB		 2736 /* should never get here */
2737 WARN_ON(1);
2738 break;
23a24def
JB		 2739 }
2740
2741 return 1;
2742}
2743
4406c376
JB		 2744/*
2745 * This function returns whether or not the SKB
2746 * was destined for RX processing or not, which,
2747 * if consume is true, is equivalent to whether
2748 * or not the skb was consumed.
2749 */
2750static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2751 struct sk_buff *skb, bool consume)
2752{
2753 struct ieee80211_local *local = rx->local;
2754 struct ieee80211_sub_if_data *sdata = rx->sdata;
2755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2756 struct ieee80211_hdr *hdr = (void *)skb->data;
2757 int prepares;
2758
2759 rx->skb = skb;
554891e6 2760 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2761 prepares = prepare_for_handlers(rx, hdr);
2762
2763 if (!prepares)
2764 return false;
2765
4406c376
JB		 2766 if (!consume) {
2767 skb = skb_copy(skb, GFP_ATOMIC);
2768 if (!skb) {
2769 if (net_ratelimit())
2770 wiphy_debug(local->hw.wiphy,
b305dae4 2771 "failed to copy skb for %s\n",
4406c376
JB		 2772 sdata->name);
2773 return true;
2774 }
2775
2776 rx->skb = skb;
2777 }
2778
2779 ieee80211_invoke_rx_handlers(rx);
2780 return true;
2781}
2782
571ecf67 2783/*
6368e4b1
RR		 2784 * This is the actual Rx frames handler. as it blongs to Rx path it must
2785 * be called with rcu_read_lock protection.
571ecf67 2786 */
71ebb4aa 2787static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2788 struct sk_buff *skb)
571ecf67 2789{
554891e6 2790 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2791 struct ieee80211_local *local = hw_to_local(hw);
2792 struct ieee80211_sub_if_data *sdata;
571ecf67 2793 struct ieee80211_hdr *hdr;
e3cf8b3f 2794 __le16 fc;
5cf121c3 2795 struct ieee80211_rx_data rx;
4406c376 2796 struct ieee80211_sub_if_data *prev;
56af3268 2797 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2798 int err = 0;
571ecf67 2799
e3cf8b3f 2800 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2801 memset(&rx, 0, sizeof(rx));
2802 rx.skb = skb;
2803 rx.local = local;
72abd81b 2804
e3cf8b3f 2805 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2806 local->dot11ReceivedFragmentCount++;
571ecf67 2807
142b9f50 2808 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2809 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2810 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2811
e3cf8b3f
ZY		 2812 if (ieee80211_is_mgmt(fc))
2813 err = skb_linearize(skb);
2814 else
2815 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2816
2817 if (err) {
2818 dev_kfree_skb(skb);
2819 return;
2820 }
2821
2822 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2823 ieee80211_parse_qos(&rx);
d1c3a37c 2824 ieee80211_verify_alignment(&rx);
38f3714d 2825
e3cf8b3f 2826 if (ieee80211_is_data(fc)) {
56af3268 2827 prev_sta = NULL;
4406c376 2828
2a33bee2 2829 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2830 if (!prev_sta) {
2831 prev_sta = sta;
2832 continue;
2833 }
2834
2835 rx.sta = prev_sta;
2836 rx.sdata = prev_sta->sdata;
4406c376 2837 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2838
56af3268 2839 prev_sta = sta;
4406c376 2840 }
56af3268
BG		 2841
2842 if (prev_sta) {
2843 rx.sta = prev_sta;
2844 rx.sdata = prev_sta->sdata;
2845
4406c376 2846 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2847 return;
8e26d5ad 2848 goto out;
56af3268 2849 }
4406c376
JB		 2850 }
2851
4b0dd98e 2852 prev = NULL;
b2e7771e 2853
4b0dd98e
JB		 2854 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2855 if (!ieee80211_sdata_running(sdata))
2856 continue;
340e11f3 2857
4b0dd98e
JB		 2858 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2859 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2860 continue;
340e11f3 2861
4b0dd98e
JB		 2862 /*
2863 * frame is destined for this interface, but if it's
2864 * not also for the previous one we handle that after
2865 * the loop to avoid copying the SKB once too much
2866 */
4bb29f8c 2867
4b0dd98e 2868 if (!prev) {
abe60632 2869 prev = sdata;
4b0dd98e 2870 continue;
340e11f3 2871 }
4bb29f8c 2872
2a33bee2 2873 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2874 rx.sdata = prev;
2875 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2876
4b0dd98e
JB		 2877 prev = sdata;
2878 }
2879
2880 if (prev) {
2a33bee2 2881 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2882 rx.sdata = prev;
4406c376 2883
4b0dd98e
JB		 2884 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2885 return;
571ecf67 2886 }
4406c376 2887
8e26d5ad 2888 out:
4406c376 2889 dev_kfree_skb(skb);
571ecf67 2890}
6368e4b1
RR		 2891
2892/*
2893 * This is the receive path handler. It is called by a low level driver when an
2894 * 802.11 MPDU is received from the hardware.
2895 */
103bf9f7 2896void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2897{
2898 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2899 struct ieee80211_rate *rate = NULL;
2900 struct ieee80211_supported_band *sband;
f1d58c25 2901 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2902
d20ef63d
JB		 2903 WARN_ON_ONCE(softirq_count() == 0);
2904
77a980dc
JB		 2905 if (WARN_ON(status->band < 0 ||
2906 status->band >= IEEE80211_NUM_BANDS))
2907 goto drop;
8318d78a
JB		 2908
2909 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2910 if (WARN_ON(!sband))
2911 goto drop;
8318d78a 2912
89c3a8ac
JB		 2913 /*
2914 * If we're suspending, it is possible although not too likely
2915 * that we'd be receiving frames after having already partially
2916 * quiesced the stack. We can't process such frames then since
2917 * that might, for example, cause stations to be added or other
2918 * driver callbacks be invoked.
2919 */
77a980dc
JB		 2920 if (unlikely(local->quiescing || local->suspended))
2921 goto drop;
89c3a8ac 2922
ea77f12f
JB		 2923 /*
2924 * The same happens when we're not even started,
2925 * but that's worth a warning.
2926 */
77a980dc
JB		 2927 if (WARN_ON(!local->started))
2928 goto drop;
ea77f12f 2929
fc885189 2930 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2931 /*
fc885189
JB		 2932 * Validate the rate, unless a PLCP error means that
2933 * we probably can't have a valid rate here anyway.
e5d6eb83 2934 */
fc885189
JB		 2935
2936 if (status->flag & RX_FLAG_HT) {
2937 /*
2938 * rate_idx is MCS index, which can be [0-76]
2939 * as documented on:
2940 *
2941 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2942 *
2943 * Anything else would be some sort of driver or
2944 * hardware error. The driver should catch hardware
2945 * errors.
2946 */
2947 if (WARN((status->rate_idx < 0 ||
2948 status->rate_idx > 76),
2949 "Rate marked as an HT rate but passed "
2950 "status->rate_idx is not "
2951 "an MCS index [0-76]: %d (0x%02x)\n",
2952 status->rate_idx,
2953 status->rate_idx))
2954 goto drop;
2955 } else {
2956 if (WARN_ON(status->rate_idx < 0 ||
2957 status->rate_idx >= sband->n_bitrates))
2958 goto drop;
2959 rate = &sband->bitrates[status->rate_idx];
2960 }
0fb8ca45 2961 }
6368e4b1 2962
554891e6
JB		 2963 status->rx_flags = 0;
2964
6368e4b1
RR		 2965 /*
2966 * key references and virtual interfaces are protected using RCU
2967 * and this requires that we are in a read-side RCU section during
2968 * receive processing
2969 */
2970 rcu_read_lock();
2971
2972 /*
2973 * Frames with failed FCS/PLCP checksum are not returned,
2974 * all other frames are returned without radiotap header
2975 * if it was previously present.
2976 * Also, frames with less than 16 bytes are dropped.
2977 */
f1d58c25 2978 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2979 if (!skb) {
2980 rcu_read_unlock();
2981 return;
2982 }
2983
e1e54068
JB		 2984 ieee80211_tpt_led_trig_rx(local,
2985 ((struct ieee80211_hdr *)skb->data)->frame_control,
2986 skb->len);
071d9ac2 2987 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2988
2989 rcu_read_unlock();
77a980dc
JB		 2990
2991 return;
2992 drop:
2993 kfree_skb(skb);
6368e4b1 2994}
103bf9f7 2995EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2996
2997/* This is a version of the rx handler that can be called from hard irq
2998 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2999void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3000{
3001 struct ieee80211_local *local = hw_to_local(hw);
3002
3003 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3004
571ecf67
JB		 3005 skb->pkt_type = IEEE80211_RX_MSG;
3006 skb_queue_tail(&local->skb_queue, skb);
3007 tasklet_schedule(&local->tasklet);
3008}
3009EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)