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Fix common misspellings
[linux-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
MSS		 145 * MCS information is a separate field in radiotap,
146 * added below.
0fb8ca45
JM		 147 */
148 *pos = 0;
8d6f658e 149 } else {
ebe6c7ba 150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 151 *pos = rate->bitrate / 5;
8d6f658e 152 }
601ae7f2
BR		 153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 156 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
5f0b7de5
JB		 161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
9deb1ae5 164 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
601ae7f2 167 else
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2
BR		 170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
601ae7f2
BR		 180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 190 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 191 pos++;
aae89831 192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
601ae7f2 195 pos += 2;
6d744bac
JB		 196
197 if (status->flag & RX_FLAG_HT) {
198 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
199 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
200 IEEE80211_RADIOTAP_MCS_HAVE_GI |
201 IEEE80211_RADIOTAP_MCS_HAVE_BW;
202 *pos = 0;
203 if (status->flag & RX_FLAG_SHORT_GI)
204 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
205 if (status->flag & RX_FLAG_40MHZ)
206 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
207 pos++;
208 *pos++ = status->rate_idx;
209 }
601ae7f2
BR		 210}
211
b2e7771e
JB		 212/*
213 * This function copies a received frame to all monitor interfaces and
214 * returns a cleaned-up SKB that no longer includes the FCS nor the
215 * radiotap header the driver might have added.
216 */
217static struct sk_buff *
218ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 219 struct ieee80211_rate *rate)
b2e7771e 220{
f1d58c25 221 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 222 struct ieee80211_sub_if_data *sdata;
b2e7771e 223 int needed_headroom = 0;
b2e7771e
JB		 224 struct sk_buff *skb, *skb2;
225 struct net_device *prev_dev = NULL;
226 int present_fcs_len = 0;
b2e7771e
JB		 227
228 /*
229 * First, we may need to make a copy of the skb because
230 * (1) we need to modify it for radiotap (if not present), and
231 * (2) the other RX handlers will modify the skb we got.
232 *
233 * We don't need to, of course, if we aren't going to return
234 * the SKB because it has a bad FCS/PLCP checksum.
235 */
0869aea0
JB		 236
237 /* room for the radiotap header based on driver features */
238 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 239
240 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
241 present_fcs_len = FCS_LEN;
242
e3cf8b3f
ZY		 243 /* make sure hdr->frame_control is on the linear part */
244 if (!pskb_may_pull(origskb, 2)) {
245 dev_kfree_skb(origskb);
246 return NULL;
247 }
248
b2e7771e 249 if (!local->monitors) {
0869aea0 250 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
0869aea0 255 return remove_monitor_info(local, origskb);
b2e7771e
JB		 256 }
257
0869aea0 258 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 259 /* only need to expand headroom if necessary */
260 skb = origskb;
261 origskb = NULL;
262
263 /*
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
269 */
270 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 272 dev_kfree_skb(skb);
273 return NULL;
274 }
275 } else {
276 /*
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
279 */
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281
0869aea0 282 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 283
284 if (!skb)
285 return origskb;
286 }
287
0869aea0
JB		 288 /* prepend radiotap information */
289 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 290
ce3edf6d 291 skb_reset_mac_header(skb);
b2e7771e
JB		 292 skb->ip_summed = CHECKSUM_UNNECESSARY;
293 skb->pkt_type = PACKET_OTHERHOST;
294 skb->protocol = htons(ETH_P_802_2);
295
296 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 297 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 298 continue;
299
3d30d949
MW		 300 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
301 continue;
302
9607e6b6 303 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 304 continue;
305
b2e7771e
JB		 306 if (prev_dev) {
307 skb2 = skb_clone(skb, GFP_ATOMIC);
308 if (skb2) {
309 skb2->dev = prev_dev;
5548a8a1 310 netif_receive_skb(skb2);
b2e7771e
JB		 311 }
312 }
313
314 prev_dev = sdata->dev;
315 sdata->dev->stats.rx_packets++;
316 sdata->dev->stats.rx_bytes += skb->len;
317 }
318
319 if (prev_dev) {
320 skb->dev = prev_dev;
5548a8a1 321 netif_receive_skb(skb);
b2e7771e
JB		 322 } else
323 dev_kfree_skb(skb);
324
325 return origskb;
326}
327
328
5cf121c3 329static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 330{
238f74a2 331 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 332 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 333 int tid;
334
335 /* does the frame have a qos control field? */
238f74a2
HH		 336 if (ieee80211_is_data_qos(hdr->frame_control)) {
337 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 338 /* frame has qos control */
238f74a2
HH		 339 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
340 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 341 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 342 } else {
1411f9b5
JB		 343 /*
344 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
345 *
346 * Sequence numbers for management frames, QoS data
347 * frames with a broadcast/multicast address in the
348 * Address 1 field, and all non-QoS data frames sent
349 * by QoS STAs are assigned using an additional single
350 * modulo-4096 counter, [...]
351 *
352 * We also use that counter for non-QoS STAs.
353 */
354 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 355 }
52865dfd 356
5cf121c3 357 rx->queue = tid;
6e0d114d
JB		 358 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
359 * For now, set skb->priority to 0 for other cases. */
360 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 361}
6e0d114d 362
d1c3a37c
JB		 363/**
364 * DOC: Packet alignment
365 *
366 * Drivers always need to pass packets that are aligned to two-byte boundaries
367 * to the stack.
368 *
369 * Additionally, should, if possible, align the payload data in a way that
370 * guarantees that the contained IP header is aligned to a four-byte
371 * boundary. In the case of regular frames, this simply means aligning the
372 * payload to a four-byte boundary (because either the IP header is directly
373 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 374 * in front of it). If the payload data is not properly aligned and the
375 * architecture doesn't support efficient unaligned operations, mac80211
376 * will align the data.
d1c3a37c
JB		 377 *
378 * With A-MSDU frames, however, the payload data address must yield two modulo
379 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
380 * push the IP header further back to a multiple of four again. Thankfully, the
381 * specs were sane enough this time around to require padding each A-MSDU
382 * subframe to a length that is a multiple of four.
383 *
25985edc 384 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 385 * the payload is not supported, the driver is required to move the 802.11
386 * header to be directly in front of the payload in that case.
387 */
388static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 389{
59d9cb07
KV		 390#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
391 WARN_ONCE((unsigned long)rx->skb->data & 1,
392 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 393#endif
6e0d114d
JB		 394}
395
6368e4b1 396
571ecf67
JB		 397/* rx handlers */
398
49461622 399static ieee80211_rx_result debug_noinline
5cf121c3 400ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 401{
402 struct ieee80211_local *local = rx->local;
554891e6 403 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 404 struct sk_buff *skb = rx->skb;
405
554891e6 406 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 407 return RX_CONTINUE;
408
b23b025f
BG		 409 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
410 test_bit(SCAN_SW_SCANNING, &local->scanning))
f1d58c25 411 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 412
4080c7cd
JB		 413 /* scanning finished during invoking of handlers */
414 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
415 return RX_DROP_UNUSABLE;
571ecf67
JB		 416}
417
3cfcf6ac
JM		 418
419static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
420{
421 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
422
423 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
424 return 0;
425
426 return ieee80211_is_robust_mgmt_frame(hdr);
427}
428
429
430static int ieee80211_is_multicast_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
441/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
442static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
443{
444 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
445 struct ieee80211_mmie *mmie;
446
447 if (skb->len < 24 + sizeof(*mmie) ||
448 !is_multicast_ether_addr(hdr->da))
449 return -1;
450
451 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
452 return -1; /* not a robust management frame */
453
454 mmie = (struct ieee80211_mmie *)
455 (skb->data + skb->len - sizeof(*mmie));
456 if (mmie->element_id != WLAN_EID_MMIE ||
457 mmie->length != sizeof(*mmie) - 2)
458 return -1;
459
460 return le16_to_cpu(mmie->key_id);
461}
462
463
33b64eb2 464static ieee80211_rx_result
5cf121c3 465ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 466{
a7767f95
HH		 467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
468 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 469 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 470
a7767f95 471 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 472 if (is_multicast_ether_addr(hdr->addr1)) {
473 if (ieee80211_has_tods(hdr->frame_control) ||
474 !ieee80211_has_fromds(hdr->frame_control))
475 return RX_DROP_MONITOR;
476 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
477 return RX_DROP_MONITOR;
478 } else {
479 if (!ieee80211_has_a4(hdr->frame_control))
480 return RX_DROP_MONITOR;
481 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
482 return RX_DROP_MONITOR;
483 }
33b64eb2
LCC		 484 }
485
486 /* If there is not an established peer link and this is not a peer link
487 * establisment frame, beacon or probe, drop the frame.
488 */
489
b4e08ea1 490 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 491 struct ieee80211_mgmt *mgmt;
d6d1a5a7 492
a7767f95 493 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 494 return RX_DROP_MONITOR;
495
a7767f95 496 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 497 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 498 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 499 return RX_DROP_MONITOR;
33b64eb2 500 return RX_CONTINUE;
33b64eb2
LCC		 501 }
502
a7767f95
HH		 503 if (ieee80211_is_probe_req(hdr->frame_control) ||
504 ieee80211_is_probe_resp(hdr->frame_control) ||
505 ieee80211_is_beacon(hdr->frame_control))
506 return RX_CONTINUE;
507
508 return RX_DROP_MONITOR;
509
510 }
511
512#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
513
514 if (ieee80211_is_data(hdr->frame_control) &&
515 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 516 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 517 return RX_DROP_MONITOR;
902acc78 518#undef msh_h_get
d6d1a5a7 519
902acc78
JB		 520 return RX_CONTINUE;
521}
33b64eb2 522
1edfb1af
JB		 523#define SEQ_MODULO 0x1000
524#define SEQ_MASK 0xfff
525
526static inline int seq_less(u16 sq1, u16 sq2)
527{
528 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
529}
530
531static inline u16 seq_inc(u16 sq)
532{
533 return (sq + 1) & SEQ_MASK;
534}
535
536static inline u16 seq_sub(u16 sq1, u16 sq2)
537{
538 return (sq1 - sq2) & SEQ_MASK;
539}
540
541
542static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
543 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 544 int index)
1edfb1af 545{
24a8fdad 546 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 547 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 548 struct ieee80211_rx_status *status;
1edfb1af 549
dd318575
JB		 550 lockdep_assert_held(&tid_agg_rx->reorder_lock);
551
1edfb1af
JB		 552 if (!skb)
553 goto no_frame;
554
071d9ac2 555 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 556 tid_agg_rx->stored_mpdu_num--;
557 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 558 status = IEEE80211_SKB_RXCB(skb);
559 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 560 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 561
562no_frame:
563 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
564}
565
566static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
567 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 568 u16 head_seq_num)
1edfb1af
JB		 569{
570 int index;
571
dd318575
JB		 572 lockdep_assert_held(&tid_agg_rx->reorder_lock);
573
1edfb1af
JB		 574 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
575 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
576 tid_agg_rx->buf_size;
24a8fdad 577 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 578 }
579}
580
581/*
582 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
583 * the skb was added to the buffer longer than this time ago, the earlier
584 * frames that have not yet been received are assumed to be lost and the skb
585 * can be released for processing. This may also release other skb's from the
586 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 587 *
588 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 589 */
590#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
591
aa0c8636 592static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 593 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 594{
2bff8ebf 595 int index, j;
aa0c8636 596
dd318575
JB		 597 lockdep_assert_held(&tid_agg_rx->reorder_lock);
598
aa0c8636
CL		 599 /* release the buffer until next missing frame */
600 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
601 tid_agg_rx->buf_size;
602 if (!tid_agg_rx->reorder_buf[index] &&
603 tid_agg_rx->stored_mpdu_num > 1) {
604 /*
605 * No buffers ready to be released, but check whether any
606 * frames in the reorder buffer have timed out.
607 */
aa0c8636
CL		 608 int skipped = 1;
609 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
610 j = (j + 1) % tid_agg_rx->buf_size) {
611 if (!tid_agg_rx->reorder_buf[j]) {
612 skipped++;
613 continue;
614 }
615 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
616 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 617 goto set_release_timer;
aa0c8636
CL		 618
619#ifdef CONFIG_MAC80211_HT_DEBUG
620 if (net_ratelimit())
0fb9a9ec
JP		 621 wiphy_debug(hw->wiphy,
622 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 623#endif
24a8fdad 624 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 625
626 /*
627 * Increment the head seq# also for the skipped slots.
628 */
629 tid_agg_rx->head_seq_num =
630 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
631 skipped = 0;
632 }
633 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 634 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 635 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
636 tid_agg_rx->buf_size;
637 }
2bff8ebf
CL		 638
639 if (tid_agg_rx->stored_mpdu_num) {
640 j = index = seq_sub(tid_agg_rx->head_seq_num,
641 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
642
643 for (; j != (index - 1) % tid_agg_rx->buf_size;
644 j = (j + 1) % tid_agg_rx->buf_size) {
645 if (tid_agg_rx->reorder_buf[j])
646 break;
647 }
648
649 set_release_timer:
650
651 mod_timer(&tid_agg_rx->reorder_timer,
652 tid_agg_rx->reorder_time[j] +
653 HT_RX_REORDER_BUF_TIMEOUT);
654 } else {
655 del_timer(&tid_agg_rx->reorder_timer);
656 }
aa0c8636
CL		 657}
658
1edfb1af
JB		 659/*
660 * As this function belongs to the RX path it must be under
661 * rcu_read_lock protection. It returns false if the frame
662 * can be processed immediately, true if it was consumed.
663 */
664static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
665 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 666 struct sk_buff *skb)
1edfb1af
JB		 667{
668 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
669 u16 sc = le16_to_cpu(hdr->seq_ctrl);
670 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
671 u16 head_seq_num, buf_size;
672 int index;
2bff8ebf 673 bool ret = true;
1edfb1af 674
dd318575
JB		 675 spin_lock(&tid_agg_rx->reorder_lock);
676
1edfb1af
JB		 677 buf_size = tid_agg_rx->buf_size;
678 head_seq_num = tid_agg_rx->head_seq_num;
679
680 /* frame with out of date sequence number */
681 if (seq_less(mpdu_seq_num, head_seq_num)) {
682 dev_kfree_skb(skb);
2bff8ebf 683 goto out;
1edfb1af
JB		 684 }
685
686 /*
687 * If frame the sequence number exceeds our buffering window
688 * size release some previous frames to make room for this one.
689 */
690 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
691 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
692 /* release stored frames up to new head to stack */
24a8fdad 693 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 694 }
695
696 /* Now the new frame is always in the range of the reordering buffer */
697
698 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
699
700 /* check if we already stored this frame */
701 if (tid_agg_rx->reorder_buf[index]) {
702 dev_kfree_skb(skb);
2bff8ebf 703 goto out;
1edfb1af
JB		 704 }
705
706 /*
707 * If the current MPDU is in the right order and nothing else
708 * is stored we can process it directly, no need to buffer it.
709 */
710 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
711 tid_agg_rx->stored_mpdu_num == 0) {
712 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 713 ret = false;
714 goto out;
1edfb1af
JB		 715 }
716
717 /* put the frame in the reordering buffer */
718 tid_agg_rx->reorder_buf[index] = skb;
719 tid_agg_rx->reorder_time[index] = jiffies;
720 tid_agg_rx->stored_mpdu_num++;
24a8fdad 721 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 722
2bff8ebf
CL		 723 out:
724 spin_unlock(&tid_agg_rx->reorder_lock);
725 return ret;
1edfb1af
JB		 726}
727
728/*
729 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
730 * true if the MPDU was buffered, false if it should be processed.
731 */
24a8fdad 732static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 733{
2569a826
JB		 734 struct sk_buff *skb = rx->skb;
735 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 736 struct ieee80211_hw *hw = &local->hw;
737 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 738 struct sta_info *sta = rx->sta;
1edfb1af
JB		 739 struct tid_ampdu_rx *tid_agg_rx;
740 u16 sc;
741 int tid;
742
743 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 744 goto dont_reorder;
1edfb1af
JB		 745
746 /*
747 * filter the QoS data rx stream according to
748 * STA/TID and check if this STA/TID is on aggregation
749 */
750
1edfb1af 751 if (!sta)
2569a826 752 goto dont_reorder;
1edfb1af
JB		 753
754 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
755
a87f736d
JB		 756 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
757 if (!tid_agg_rx)
758 goto dont_reorder;
1edfb1af
JB		 759
760 /* qos null data frames are excluded */
761 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 762 goto dont_reorder;
1edfb1af
JB		 763
764 /* new, potentially un-ordered, ampdu frame - process it */
765
766 /* reset session timer */
767 if (tid_agg_rx->timeout)
768 mod_timer(&tid_agg_rx->session_timer,
769 TU_TO_EXP_TIME(tid_agg_rx->timeout));
770
771 /* if this mpdu is fragmented - terminate rx aggregation session */
772 sc = le16_to_cpu(hdr->seq_ctrl);
773 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 774 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 775 skb_queue_tail(&rx->sdata->skb_queue, skb);
776 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 777 return;
1edfb1af
JB		 778 }
779
a87f736d
JB		 780 /*
781 * No locking needed -- we will only ever process one
782 * RX packet at a time, and thus own tid_agg_rx. All
783 * other code manipulating it needs to (and does) make
784 * sure that we cannot get to it any more before doing
785 * anything with it.
786 */
24a8fdad 787 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 788 return;
789
790 dont_reorder:
24a8fdad 791 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 792}
33b64eb2 793
49461622 794static ieee80211_rx_result debug_noinline
5cf121c3 795ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 796{
a7767f95 797 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 798 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 799
800 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
801 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 802 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 803 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 804 hdr->seq_ctrl)) {
554891e6 805 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 806 rx->local->dot11FrameDuplicateCount++;
807 rx->sta->num_duplicates++;
808 }
b1f93314 809 return RX_DROP_UNUSABLE;
571ecf67 810 } else
5cf121c3 811 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 812 }
813
571ecf67
JB		 814 if (unlikely(rx->skb->len < 16)) {
815 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 816 return RX_DROP_MONITOR;
571ecf67
JB		 817 }
818
571ecf67
JB		 819 /* Drop disallowed frame classes based on STA auth/assoc state;
820 * IEEE 802.11, Chap 5.5.
821 *
ccd7b362
JB		 822 * mac80211 filters only based on association state, i.e. it drops
823 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 824 * deauth/disassoc frames when needed. In addition, hostapd is
825 * responsible for filtering on both auth and assoc states.
826 */
33b64eb2 827
902acc78 828 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 829 return ieee80211_rx_mesh_check(rx);
33b64eb2 830
a7767f95
HH		 831 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
832 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 833 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 834 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
0c2530ce 835 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC))))
e4c26add 836 return RX_DROP_MONITOR;
571ecf67 837
9ae54c84 838 return RX_CONTINUE;
570bd537
JB		 839}
840
841
49461622 842static ieee80211_rx_result debug_noinline
5cf121c3 843ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 844{
eb9fb5b8
JB		 845 struct sk_buff *skb = rx->skb;
846 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
847 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 848 int keyidx;
849 int hdrlen;
e4c26add 850 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 851 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 852 int mmie_keyidx = -1;
761ab470 853 __le16 fc;
570bd537 854
3017b80b
JB		 855 /*
856 * Key selection 101
857 *
3cfcf6ac 858 * There are four types of keys:
3017b80b 859 * - GTK (group keys)
3cfcf6ac 860 * - IGTK (group keys for management frames)
3017b80b
JB		 861 * - PTK (pairwise keys)
862 * - STK (station-to-station pairwise keys)
863 *
864 * When selecting a key, we have to distinguish between multicast
865 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 866 * use PTKs and STKs while the former always use GTKs and IGTKs.
867 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
868 * unicast frames can also use key indices like GTKs. Hence, if we
869 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 870 *
8dc06a1c
JB		 871 * Note that in a regular BSS, multicast frames are sent by the
872 * AP only, associated stations unicast the frame to the AP first
873 * which then multicasts it on their behalf.
874 *
3017b80b
JB		 875 * There is also a slight problem in IBSS mode: GTKs are negotiated
876 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 877 * The spec seems to expect that one negotiates the same key with
878 * every station but there's no such requirement; VLANs could be
879 * possible.
3017b80b
JB		 880 */
881
3017b80b 882 /*
1990af8d 883 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 884 * addressed to us nor a multicast frame.
885 */
554891e6 886 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 887 return RX_CONTINUE;
3017b80b 888
2569a826
JB		 889 /* start without a key */
890 rx->key = NULL;
891
d4e46a3d 892 if (rx->sta)
e31b8213 893 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 894
761ab470
JB		 895 fc = hdr->frame_control;
896
897 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 898 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
899
e31b8213
JB		 900 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
901 rx->key = sta_ptk;
dc1580dd
JB		 902 if ((status->flag & RX_FLAG_DECRYPTED) &&
903 (status->flag & RX_FLAG_IV_STRIPPED))
904 return RX_CONTINUE;
0c7c10c7 905 /* Skip decryption if the frame is not protected. */
761ab470 906 if (!ieee80211_has_protected(fc))
0c7c10c7 907 return RX_CONTINUE;
3cfcf6ac
JM		 908 } else if (mmie_keyidx >= 0) {
909 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 910 if ((status->flag & RX_FLAG_DECRYPTED) &&
911 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 912 return RX_CONTINUE;
913
914 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
915 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
916 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 917 if (rx->sta)
918 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
919 if (!rx->key)
920 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 921 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 922 /*
923 * The frame was not protected, so skip decryption. However, we
924 * need to set rx->key if there is a key that could have been
925 * used so that the frame may be dropped if encryption would
926 * have been expected.
927 */
928 struct ieee80211_key *key = NULL;
897bed8b
JB		 929 struct ieee80211_sub_if_data *sdata = rx->sdata;
930 int i;
931
761ab470 932 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 933 is_multicast_ether_addr(hdr->addr1) &&
934 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
935 rx->key = key;
897bed8b
JB		 936 else {
937 if (rx->sta) {
938 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
939 key = rcu_dereference(rx->sta->gtk[i]);
940 if (key)
941 break;
942 }
943 }
944 if (!key) {
945 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
946 key = rcu_dereference(sdata->keys[i]);
947 if (key)
948 break;
949 }
950 }
951 if (key)
952 rx->key = key;
953 }
0c7c10c7 954 return RX_CONTINUE;
571ecf67 955 } else {
39184b15 956 u8 keyid;
3017b80b
JB		 957 /*
958 * The device doesn't give us the IV so we won't be
959 * able to look up the key. That's ok though, we
960 * don't need to decrypt the frame, we just won't
961 * be able to keep statistics accurate.
962 * Except for key threshold notifications, should
963 * we somehow allow the driver to tell us which key
964 * the hardware used if this flag is set?
965 */
eb9fb5b8
JB		 966 if ((status->flag & RX_FLAG_DECRYPTED) &&
967 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 968 return RX_CONTINUE;
3017b80b 969
761ab470 970 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 971
972 if (rx->skb->len < 8 + hdrlen)
e4c26add 973 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 974
975 /*
976 * no need to call ieee80211_wep_get_keyidx,
977 * it verifies a bunch of things we've done already
978 */
39184b15
ZY		 979 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
980 keyidx = keyid >> 6;
3017b80b 981
e31b8213
JB		 982 /* check per-station GTK first, if multicast packet */
983 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
984 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 985
e31b8213
JB		 986 /* if not found, try default key */
987 if (!rx->key) {
988 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
989
990 /*
991 * RSNA-protected unicast frames should always be
992 * sent with pairwise or station-to-station keys,
993 * but for WEP we allow using a key index as well.
994 */
995 if (rx->key &&
996 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
997 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
998 !is_multicast_ether_addr(hdr->addr1))
999 rx->key = NULL;
1000 }
571ecf67
JB		 1001 }
1002
3017b80b 1003 if (rx->key) {
571ecf67 1004 rx->key->tx_rx_count++;
011bfcc4 1005 /* TODO: add threshold stuff again */
1990af8d 1006 } else {
e4c26add 1007 return RX_DROP_MONITOR;
70f08765
JB		 1008 }
1009
39184b15
ZY		 1010 if (skb_linearize(rx->skb))
1011 return RX_DROP_UNUSABLE;
761ab470 1012 /* the hdr variable is invalid now! */
1990af8d 1013
97359d12
JB		 1014 switch (rx->key->conf.cipher) {
1015 case WLAN_CIPHER_SUITE_WEP40:
1016 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1017 /* Check for weak IVs if possible */
1018 if (rx->sta && ieee80211_is_data(fc) &&
1019 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1020 !(status->flag & RX_FLAG_DECRYPTED)) &&
1021 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1022 rx->sta->wep_weak_iv_count++;
1023
e2f036da
MN		 1024 result = ieee80211_crypto_wep_decrypt(rx);
1025 break;
97359d12 1026 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1027 result = ieee80211_crypto_tkip_decrypt(rx);
1028 break;
97359d12 1029 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1030 result = ieee80211_crypto_ccmp_decrypt(rx);
1031 break;
97359d12 1032 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1033 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1034 break;
3ffc2a90
JB		 1035 default:
1036 /*
1037 * We can reach here only with HW-only algorithms
1038 * but why didn't it decrypt the frame?!
1039 */
1040 return RX_DROP_UNUSABLE;
70f08765
JB		 1041 }
1042
e2f036da 1043 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1044 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1045
1046 return result;
70f08765
JB		 1047}
1048
572e0012
KV		 1049static ieee80211_rx_result debug_noinline
1050ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1051{
1052 struct ieee80211_local *local;
1053 struct ieee80211_hdr *hdr;
1054 struct sk_buff *skb;
1055
1056 local = rx->local;
1057 skb = rx->skb;
1058 hdr = (struct ieee80211_hdr *) skb->data;
1059
1060 if (!local->pspolling)
1061 return RX_CONTINUE;
1062
1063 if (!ieee80211_has_fromds(hdr->frame_control))
1064 /* this is not from AP */
1065 return RX_CONTINUE;
1066
1067 if (!ieee80211_is_data(hdr->frame_control))
1068 return RX_CONTINUE;
1069
1070 if (!ieee80211_has_moredata(hdr->frame_control)) {
1071 /* AP has no more frames buffered for us */
1072 local->pspolling = false;
1073 return RX_CONTINUE;
1074 }
1075
1076 /* more data bit is set, let's request a new frame from the AP */
1077 ieee80211_send_pspoll(local, rx->sdata);
1078
1079 return RX_CONTINUE;
1080}
1081
133b8226 1082static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1083{
133b8226 1084 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1085 struct ieee80211_local *local = sdata->local;
0795af57 1086
3e122be0 1087 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1088 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1089 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1090 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1091#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1092 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1093 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1094#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1095}
1096
ff9458d3 1097static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1098{
133b8226 1099 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1100
3e122be0 1101 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1102
571ecf67 1103#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1104 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1105 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1106#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1107
af818581 1108 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1109#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1110 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1111 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1112#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1113 return;
1114 }
1115
1116 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1117}
1118
d057e5a3
AN		 1119int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1120{
1121 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1122 bool in_ps;
1123
1124 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1125
1126 /* Don't let the same PS state be set twice */
1127 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1128 if ((start && in_ps) || (!start && !in_ps))
1129 return -EINVAL;
1130
1131 if (start)
1132 ap_sta_ps_start(sta_inf);
1133 else
1134 ap_sta_ps_end(sta_inf);
1135
1136 return 0;
1137}
1138EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1139
49461622 1140static ieee80211_rx_result debug_noinline
5cf121c3 1141ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1142{
1143 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1144 struct sk_buff *skb = rx->skb;
1145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1146 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1147
1148 if (!sta)
9ae54c84 1149 return RX_CONTINUE;
571ecf67 1150
b291ba11
JB		 1151 /*
1152 * Update last_rx only for IBSS packets which are for the current
1153 * BSSID to avoid keeping the current IBSS network alive in cases
1154 * where other STAs start using different BSSID.
1155 */
05c914fe 1156 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1157 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1158 NL80211_IFTYPE_ADHOC);
3af6334c 1159 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1160 sta->last_rx = jiffies;
3af6334c
FF		 1161 if (ieee80211_is_data(hdr->frame_control)) {
1162 sta->last_rx_rate_idx = status->rate_idx;
1163 sta->last_rx_rate_flag = status->flag;
1164 }
1165 }
b291ba11
JB		 1166 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1167 /*
33b64eb2
LCC		 1168 * Mesh beacons will update last_rx when if they are found to
1169 * match the current local configuration when processed.
571ecf67 1170 */
b291ba11 1171 sta->last_rx = jiffies;
3af6334c
FF		 1172 if (ieee80211_is_data(hdr->frame_control)) {
1173 sta->last_rx_rate_idx = status->rate_idx;
1174 sta->last_rx_rate_flag = status->flag;
1175 }
571ecf67
JB		 1176 }
1177
554891e6 1178 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1179 return RX_CONTINUE;
571ecf67 1180
3cf335d5
KV		 1181 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1182 ieee80211_sta_rx_notify(rx->sdata, hdr);
1183
571ecf67
JB		 1184 sta->rx_fragments++;
1185 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1186 sta->last_signal = status->signal;
541a45a1 1187 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1188
72eaa43a
JB		 1189 /*
1190 * Change STA power saving mode only at the end of a frame
1191 * exchange sequence.
1192 */
d057e5a3
AN		 1193 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1194 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1195 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1196 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1197 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1198 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1199 /*
1200 * Ignore doze->wake transitions that are
1201 * indicated by non-data frames, the standard
1202 * is unclear here, but for example going to
1203 * PS mode and then scanning would cause a
1204 * doze->wake transition for the probe request,
1205 * and that is clearly undesirable.
1206 */
1207 if (ieee80211_is_data(hdr->frame_control) &&
1208 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1209 ap_sta_ps_end(sta);
72eaa43a
JB		 1210 } else {
1211 if (ieee80211_has_pm(hdr->frame_control))
1212 ap_sta_ps_start(sta);
1213 }
571ecf67
JB		 1214 }
1215
22403def
JB		 1216 /*
1217 * Drop (qos-)data::nullfunc frames silently, since they
1218 * are used only to control station power saving mode.
1219 */
1220 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1221 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1222 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1223
1224 /*
1225 * If we receive a 4-addr nullfunc frame from a STA
1226 * that was not moved to a 4-addr STA vlan yet, drop
1227 * the frame to the monitor interface, to make sure
1228 * that hostapd sees it
1229 */
1230 if (ieee80211_has_a4(hdr->frame_control) &&
1231 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1232 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1233 !rx->sdata->u.vlan.sta)))
1234 return RX_DROP_MONITOR;
22403def
JB		 1235 /*
1236 * Update counter and free packet here to avoid
1237 * counting this as a dropped packed.
1238 */
571ecf67
JB		 1239 sta->rx_packets++;
1240 dev_kfree_skb(rx->skb);
9ae54c84 1241 return RX_QUEUED;
571ecf67
JB		 1242 }
1243
9ae54c84 1244 return RX_CONTINUE;
571ecf67
JB		 1245} /* ieee80211_rx_h_sta_process */
1246
571ecf67
JB		 1247static inline struct ieee80211_fragment_entry *
1248ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1249 unsigned int frag, unsigned int seq, int rx_queue,
1250 struct sk_buff **skb)
1251{
1252 struct ieee80211_fragment_entry *entry;
1253 int idx;
1254
1255 idx = sdata->fragment_next;
1256 entry = &sdata->fragments[sdata->fragment_next++];
1257 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1258 sdata->fragment_next = 0;
1259
1260 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1261#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1262 struct ieee80211_hdr *hdr =
1263 (struct ieee80211_hdr *) entry->skb_list.next->data;
1264 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1265 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1266 "addr1=%pM addr2=%pM\n",
47846c9b 1267 sdata->name, idx,
571ecf67 1268 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1269 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1270#endif
571ecf67
JB		 1271 __skb_queue_purge(&entry->skb_list);
1272 }
1273
1274 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1275 *skb = NULL;
1276 entry->first_frag_time = jiffies;
1277 entry->seq = seq;
1278 entry->rx_queue = rx_queue;
1279 entry->last_frag = frag;
1280 entry->ccmp = 0;
1281 entry->extra_len = 0;
1282
1283 return entry;
1284}
1285
1286static inline struct ieee80211_fragment_entry *
1287ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1288 unsigned int frag, unsigned int seq,
571ecf67
JB		 1289 int rx_queue, struct ieee80211_hdr *hdr)
1290{
1291 struct ieee80211_fragment_entry *entry;
1292 int i, idx;
1293
1294 idx = sdata->fragment_next;
1295 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1296 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1297
1298 idx--;
1299 if (idx < 0)
1300 idx = IEEE80211_FRAGMENT_MAX - 1;
1301
1302 entry = &sdata->fragments[idx];
1303 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1304 entry->rx_queue != rx_queue ||
1305 entry->last_frag + 1 != frag)
1306 continue;
1307
b73d70ad 1308 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1309
b73d70ad
HH		 1310 /*
1311 * Check ftype and addresses are equal, else check next fragment
1312 */
1313 if (((hdr->frame_control ^ f_hdr->frame_control) &
1314 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1315 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1316 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1317 continue;
1318
ab46623e 1319 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1320 __skb_queue_purge(&entry->skb_list);
1321 continue;
1322 }
1323 return entry;
1324 }
1325
1326 return NULL;
1327}
1328
49461622 1329static ieee80211_rx_result debug_noinline
5cf121c3 1330ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1331{
1332 struct ieee80211_hdr *hdr;
1333 u16 sc;
358c8d9d 1334 __le16 fc;
571ecf67
JB		 1335 unsigned int frag, seq;
1336 struct ieee80211_fragment_entry *entry;
1337 struct sk_buff *skb;
554891e6 1338 struct ieee80211_rx_status *status;
571ecf67 1339
b73d70ad 1340 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1341 fc = hdr->frame_control;
571ecf67
JB		 1342 sc = le16_to_cpu(hdr->seq_ctrl);
1343 frag = sc & IEEE80211_SCTL_FRAG;
1344
358c8d9d 1345 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1346 (rx->skb)->len < 24 ||
1347 is_multicast_ether_addr(hdr->addr1))) {
1348 /* not fragmented */
1349 goto out;
1350 }
1351 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1352
e3cf8b3f
ZY		 1353 if (skb_linearize(rx->skb))
1354 return RX_DROP_UNUSABLE;
1355
058897a4
AK		 1356 /*
1357 * skb_linearize() might change the skb->data and
1358 * previously cached variables (in this case, hdr) need to
1359 * be refreshed with the new data.
1360 */
1361 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1362 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1363
1364 if (frag == 0) {
1365 /* This is the first fragment of a new frame. */
1366 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1367 rx->queue, &(rx->skb));
97359d12 1368 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1369 ieee80211_has_protected(fc)) {
9190252c
JM		 1370 int queue = ieee80211_is_mgmt(fc) ?
1371 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1372 /* Store CCMP PN so that we can verify that the next
1373 * fragment has a sequential PN value. */
1374 entry->ccmp = 1;
1375 memcpy(entry->last_pn,
9190252c 1376 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1377 CCMP_PN_LEN);
1378 }
9ae54c84 1379 return RX_QUEUED;
571ecf67
JB		 1380 }
1381
1382 /* This is a fragment for a frame that should already be pending in
1383 * fragment cache. Add this fragment to the end of the pending entry.
1384 */
b73d70ad 1385 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1386 if (!entry) {
1387 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1388 return RX_DROP_MONITOR;
571ecf67
JB		 1389 }
1390
1391 /* Verify that MPDUs within one MSDU have sequential PN values.
1392 * (IEEE 802.11i, 8.3.3.4.5) */
1393 if (entry->ccmp) {
1394 int i;
1395 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1396 int queue;
97359d12 1397 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1398 return RX_DROP_UNUSABLE;
571ecf67
JB		 1399 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1400 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1401 pn[i]++;
1402 if (pn[i])
1403 break;
1404 }
9190252c
JM		 1405 queue = ieee80211_is_mgmt(fc) ?
1406 NUM_RX_DATA_QUEUES : rx->queue;
1407 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1408 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1409 return RX_DROP_UNUSABLE;
571ecf67
JB		 1410 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1411 }
1412
358c8d9d 1413 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1414 __skb_queue_tail(&entry->skb_list, rx->skb);
1415 entry->last_frag = frag;
1416 entry->extra_len += rx->skb->len;
358c8d9d 1417 if (ieee80211_has_morefrags(fc)) {
571ecf67 1418 rx->skb = NULL;
9ae54c84 1419 return RX_QUEUED;
571ecf67
JB		 1420 }
1421
1422 rx->skb = __skb_dequeue(&entry->skb_list);
1423 if (skb_tailroom(rx->skb) < entry->extra_len) {
1424 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1425 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1426 GFP_ATOMIC))) {
1427 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1428 __skb_queue_purge(&entry->skb_list);
e4c26add 1429 return RX_DROP_UNUSABLE;
571ecf67
JB		 1430 }
1431 }
1432 while ((skb = __skb_dequeue(&entry->skb_list))) {
1433 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1434 dev_kfree_skb(skb);
1435 }
1436
1437 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1438 status = IEEE80211_SKB_RXCB(rx->skb);
1439 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1440
1441 out:
1442 if (rx->sta)
1443 rx->sta->rx_packets++;
1444 if (is_multicast_ether_addr(hdr->addr1))
1445 rx->local->dot11MulticastReceivedFrameCount++;
1446 else
1447 ieee80211_led_rx(rx->local);
9ae54c84 1448 return RX_CONTINUE;
571ecf67
JB		 1449}
1450
49461622 1451static ieee80211_rx_result debug_noinline
5cf121c3 1452ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1453{
af818581 1454 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1455 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1456 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1457
358c8d9d 1458 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1459 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1460 return RX_CONTINUE;
571ecf67 1461
05c914fe
JB		 1462 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1463 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1464 return RX_DROP_UNUSABLE;
98f0b0a3 1465
af818581
JB		 1466 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1467 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1468 else
1469 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1470
9ae54c84 1471 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1472 * count as an dropped frame. */
1473 dev_kfree_skb(rx->skb);
1474
9ae54c84 1475 return RX_QUEUED;
571ecf67
JB		 1476}
1477
49461622 1478static ieee80211_rx_result debug_noinline
5cf121c3 1479ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1480{
6e0d114d 1481 u8 *data = rx->skb->data;
238f74a2 1482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1483
238f74a2 1484 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1485 return RX_CONTINUE;
6e0d114d
JB		 1486
1487 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1488 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1489 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1490 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1491 /* change frame type to non QOS */
238f74a2 1492 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1493
9ae54c84 1494 return RX_CONTINUE;
6e0d114d
JB		 1495}
1496
76ee65bf 1497static int
5cf121c3 1498ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1499{
07346f81 1500 if (unlikely(!rx->sta ||
f4ea83dd 1501 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1502 return -EACCES;
571ecf67 1503
76ee65bf 1504 return 0;
571ecf67
JB		 1505}
1506
76ee65bf 1507static int
358c8d9d 1508ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1509{
eb9fb5b8
JB		 1510 struct sk_buff *skb = rx->skb;
1511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1512
3017b80b 1513 /*
7848ba7d
JB		 1514 * Pass through unencrypted frames if the hardware has
1515 * decrypted them already.
3017b80b 1516 */
eb9fb5b8 1517 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1518 return 0;
571ecf67
JB		 1519
1520 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1521 if (unlikely(!ieee80211_has_protected(fc) &&
1522 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1523 ieee80211_is_data(fc) &&
b3fc9c6c 1524 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1525 return -EACCES;
bef5d1c7
JB		 1526
1527 return 0;
1528}
1529
1530static int
1531ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1532{
1533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1534 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1535 __le16 fc = hdr->frame_control;
bef5d1c7 1536
e3efca0a
JM		 1537 /*
1538 * Pass through unencrypted frames if the hardware has
1539 * decrypted them already.
1540 */
1541 if (status->flag & RX_FLAG_DECRYPTED)
1542 return 0;
bef5d1c7 1543
f2ca3ea4 1544 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1545 if (unlikely(!ieee80211_has_protected(fc) &&
1546 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1547 rx->key)) {
1548 if (ieee80211_is_deauth(fc))
1549 cfg80211_send_unprot_deauth(rx->sdata->dev,
1550 rx->skb->data,
1551 rx->skb->len);
1552 else if (ieee80211_is_disassoc(fc))
1553 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1554 rx->skb->data,
1555 rx->skb->len);
f2ca3ea4 1556 return -EACCES;
cf4e594e 1557 }
f2ca3ea4 1558 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1559 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1560 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1561 if (ieee80211_is_deauth(fc))
1562 cfg80211_send_unprot_deauth(rx->sdata->dev,
1563 rx->skb->data,
1564 rx->skb->len);
1565 else if (ieee80211_is_disassoc(fc))
1566 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1567 rx->skb->data,
1568 rx->skb->len);
f2ca3ea4 1569 return -EACCES;
cf4e594e 1570 }
f2ca3ea4
JM		 1571 /*
1572 * When using MFP, Action frames are not allowed prior to
1573 * having configured keys.
1574 */
1575 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1576 ieee80211_is_robust_mgmt_frame(
1577 (struct ieee80211_hdr *) rx->skb->data)))
1578 return -EACCES;
1579 }
b3fc9c6c 1580
76ee65bf 1581 return 0;
571ecf67
JB		 1582}
1583
76ee65bf 1584static int
e31a16d6 1585__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1586{
eb9fb5b8 1587 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1589 bool check_port_control = false;
1590 struct ethhdr *ehdr;
1591 int ret;
f14543ee 1592
9bc383de
JB		 1593 if (ieee80211_has_a4(hdr->frame_control) &&
1594 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1595 return -1;
9bc383de 1596
fbb327c5
FF		 1597 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1598 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1599
1600 if (!sdata->u.mgd.use_4addr)
1601 return -1;
1602 else
1603 check_port_control = true;
1604 }
1605
9bc383de 1606 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1607 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1608 return -1;
571ecf67 1609
fbb327c5
FF		 1610 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1611 if (ret < 0 || !check_port_control)
1612 return ret;
1613
1614 ehdr = (struct ethhdr *) rx->skb->data;
1615 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1616 return -1;
1617
1618 return 0;
76ee65bf 1619}
571ecf67 1620
ce3edf6d
JB		 1621/*
1622 * requires that rx->skb is a frame with ethernet header
1623 */
358c8d9d 1624static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1625{
c97c23e3 1626 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1627 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1628 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1629
1630 /*
1631 * Allow EAPOL frames to us/the PAE group address regardless
1632 * of whether the frame was encrypted or not.
1633 */
a621fa4d 1634 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1635 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1636 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1637 return true;
1638
1639 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1640 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1641 return false;
1642
1643 return true;
1644}
1645
1646/*
1647 * requires that rx->skb is a frame with ethernet header
1648 */
76ee65bf 1649static void
5cf121c3 1650ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1651{
eb9fb5b8
JB		 1652 struct ieee80211_sub_if_data *sdata = rx->sdata;
1653 struct net_device *dev = sdata->dev;
76ee65bf 1654 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1655 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1656 struct sta_info *dsta;
554891e6 1657 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1658
76ee65bf
RR		 1659 skb = rx->skb;
1660 xmit_skb = NULL;
571ecf67 1661
05c914fe
JB		 1662 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1663 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1664 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1665 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1666 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1667 if (is_multicast_ether_addr(ehdr->h_dest)) {
1668 /*
1669 * send multicast frames both to higher layers in
1670 * local net stack and back to the wireless medium
1671 */
76ee65bf
RR		 1672 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1673 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1674 printk(KERN_DEBUG "%s: failed to clone "
1675 "multicast frame\n", dev->name);
1676 } else {
abe60632
JB		 1677 dsta = sta_info_get(sdata, skb->data);
1678 if (dsta) {
ce3edf6d
JB		 1679 /*
1680 * The destination station is associated to
1681 * this AP (in this VLAN), so send the frame
1682 * directly to it and do not pass it to local
1683 * net stack.
571ecf67 1684 */
76ee65bf 1685 xmit_skb = skb;
571ecf67
JB		 1686 skb = NULL;
1687 }
571ecf67
JB		 1688 }
1689 }
1690
1691 if (skb) {
d1c3a37c
JB		 1692 int align __maybe_unused;
1693
59d9cb07 1694#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1695 /*
1696 * 'align' will only take the values 0 or 2 here
1697 * since all frames are required to be aligned
1698 * to 2-byte boundaries when being passed to
1699 * mac80211. That also explains the __skb_push()
1700 * below.
1701 */
dacb6f1d 1702 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1703 if (align) {
1704 if (WARN_ON(skb_headroom(skb) < 3)) {
1705 dev_kfree_skb(skb);
1706 skb = NULL;
1707 } else {
1708 u8 *data = skb->data;
8ce0b589
ZY		 1709 size_t len = skb_headlen(skb);
1710 skb->data -= align;
1711 memmove(skb->data, data, len);
1712 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1713 }
1714 }
1715#endif
1716
1717 if (skb) {
1718 /* deliver to local stack */
1719 skb->protocol = eth_type_trans(skb, dev);
1720 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1721 netif_receive_skb(skb);
d1c3a37c 1722 }
571ecf67
JB		 1723 }
1724
76ee65bf 1725 if (xmit_skb) {
571ecf67 1726 /* send to wireless media */
f831e909 1727 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1728 skb_reset_network_header(xmit_skb);
1729 skb_reset_mac_header(xmit_skb);
76ee65bf 1730 dev_queue_xmit(xmit_skb);
571ecf67 1731 }
76ee65bf
RR		 1732}
1733
49461622 1734static ieee80211_rx_result debug_noinline
5cf121c3 1735ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1736{
eb9fb5b8 1737 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1738 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1739 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1740 __le16 fc = hdr->frame_control;
eaf85ca7 1741 struct sk_buff_head frame_list;
554891e6 1742 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1743
358c8d9d 1744 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1745 return RX_CONTINUE;
fd4c7f2f 1746
358c8d9d 1747 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1748 return RX_DROP_MONITOR;
fd4c7f2f 1749
554891e6 1750 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1751 return RX_CONTINUE;
fd4c7f2f 1752
eaf85ca7
ZY		 1753 if (ieee80211_has_a4(hdr->frame_control) &&
1754 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1755 !rx->sdata->u.vlan.sta)
e4c26add 1756 return RX_DROP_UNUSABLE;
fd4c7f2f 1757
eaf85ca7
ZY		 1758 if (is_multicast_ether_addr(hdr->addr1) &&
1759 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1760 rx->sdata->u.vlan.sta) ||
1761 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1762 rx->sdata->u.mgd.use_4addr)))
e4c26add 1763 return RX_DROP_UNUSABLE;
fd4c7f2f 1764
eaf85ca7
ZY		 1765 skb->dev = dev;
1766 __skb_queue_head_init(&frame_list);
fd4c7f2f 1767
e3cf8b3f
ZY		 1768 if (skb_linearize(skb))
1769 return RX_DROP_UNUSABLE;
1770
eaf85ca7
ZY		 1771 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1772 rx->sdata->vif.type,
1773 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1774
eaf85ca7
ZY		 1775 while (!skb_queue_empty(&frame_list)) {
1776 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1777
358c8d9d 1778 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1779 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1780 continue;
1781 }
eaf85ca7
ZY		 1782 dev->stats.rx_packets++;
1783 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1784
1785 ieee80211_deliver_skb(rx);
1786 }
1787
9ae54c84 1788 return RX_QUEUED;
fd4c7f2f
RR		 1789}
1790
bf94e17b 1791#ifdef CONFIG_MAC80211_MESH
b0dee578 1792static ieee80211_rx_result
e32f85f7
LCC		 1793ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1794{
1795 struct ieee80211_hdr *hdr;
1796 struct ieee80211s_hdr *mesh_hdr;
1797 unsigned int hdrlen;
1798 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1799 struct ieee80211_local *local = rx->local;
eb9fb5b8 1800 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1801 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1802
1803 hdr = (struct ieee80211_hdr *) skb->data;
1804 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1805 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1806
1807 if (!ieee80211_is_data(hdr->frame_control))
1808 return RX_CONTINUE;
1809
1810 if (!mesh_hdr->ttl)
1811 /* illegal frame */
1812 return RX_DROP_MONITOR;
1813
43b7b314 1814 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1815 struct mesh_path *mppath;
43b7b314
JC		 1816 char *proxied_addr;
1817 char *mpp_addr;
1818
1819 if (is_multicast_ether_addr(hdr->addr1)) {
1820 mpp_addr = hdr->addr3;
1821 proxied_addr = mesh_hdr->eaddr1;
1822 } else {
1823 mpp_addr = hdr->addr4;
1824 proxied_addr = mesh_hdr->eaddr2;
1825 }
79617dee 1826
79617dee 1827 rcu_read_lock();
43b7b314 1828 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1829 if (!mppath) {
43b7b314 1830 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1831 } else {
1832 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1833 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1834 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1835 spin_unlock_bh(&mppath->state_lock);
1836 }
1837 rcu_read_unlock();
1838 }
1839
3c5772a5
JC		 1840 /* Frame has reached destination. Don't forward */
1841 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1842 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1843 return RX_CONTINUE;
1844
1845 mesh_hdr->ttl--;
1846
554891e6 1847 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1848 if (!mesh_hdr->ttl)
472dbc45 1849 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1850 dropped_frames_ttl);
1851 else {
1852 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1853 struct ieee80211_tx_info *info;
1854
e32f85f7
LCC		 1855 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1856
1857 if (!fwd_skb && net_ratelimit())
1858 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1859 sdata->name);
919bbad5 1860 if (!fwd_skb)
b51aff05 1861 goto out;
e32f85f7
LCC		 1862
1863 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1864 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1865 info = IEEE80211_SKB_CB(fwd_skb);
1866 memset(info, 0, sizeof(*info));
1867 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1868 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1869 skb_set_queue_mapping(skb,
1870 ieee80211_select_queue(rx->sdata, fwd_skb));
1871 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1872 if (is_multicast_ether_addr(fwd_hdr->addr1))
1873 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1874 fwded_mcast);
1875 else {
3c5772a5
JC		 1876 int err;
1877 /*
1878 * Save TA to addr1 to send TA a path error if a
1879 * suitable next hop is not found
1880 */
1881 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1882 ETH_ALEN);
3c5772a5 1883 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1884 /* Failed to immediately resolve next hop:
1885 * fwded frame was dropped or will be added
1886 * later to the pending skb queue. */
1887 if (err)
1888 return RX_DROP_MONITOR;
c8a61a7d
DW		 1889
1890 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1891 fwded_unicast);
249b405c
JC		 1892 }
1893 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1894 fwded_frames);
3b8d81e0 1895 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1896 }
1897 }
1898
b51aff05 1899 out:
3c5772a5 1900 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1901 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1902 return RX_CONTINUE;
1903 else
1904 return RX_DROP_MONITOR;
1905}
bf94e17b 1906#endif
e32f85f7 1907
49461622 1908static ieee80211_rx_result debug_noinline
5cf121c3 1909ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1910{
eb9fb5b8 1911 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1912 struct ieee80211_local *local = rx->local;
eb9fb5b8 1913 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1914 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1915 __le16 fc = hdr->frame_control;
ce3edf6d 1916 int err;
76ee65bf 1917
358c8d9d 1918 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1919 return RX_CONTINUE;
76ee65bf 1920
358c8d9d 1921 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1922 return RX_DROP_MONITOR;
76ee65bf 1923
f14543ee
FF		 1924 /*
1925 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1926 * that a 4-addr station can be detected and moved into a separate VLAN
1927 */
1928 if (ieee80211_has_a4(hdr->frame_control) &&
1929 sdata->vif.type == NL80211_IFTYPE_AP)
1930 return RX_DROP_MONITOR;
1931
e31a16d6 1932 err = __ieee80211_data_to_8023(rx);
76ee65bf 1933 if (unlikely(err))
e4c26add 1934 return RX_DROP_UNUSABLE;
76ee65bf 1935
358c8d9d 1936 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1937 return RX_DROP_MONITOR;
ce3edf6d 1938
76ee65bf
RR		 1939 rx->skb->dev = dev;
1940
1941 dev->stats.rx_packets++;
1942 dev->stats.rx_bytes += rx->skb->len;
1943
08ca944e 1944 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1945 !is_multicast_ether_addr(
1946 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1947 (!local->scanning &&
1948 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1949 mod_timer(&local->dynamic_ps_timer, jiffies +
1950 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1951 }
1952
76ee65bf 1953 ieee80211_deliver_skb(rx);
571ecf67 1954
9ae54c84 1955 return RX_QUEUED;
571ecf67
JB		 1956}
1957
49461622 1958static ieee80211_rx_result debug_noinline
24a8fdad 1959ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1960{
1961 struct ieee80211_local *local = rx->local;
1962 struct ieee80211_hw *hw = &local->hw;
1963 struct sk_buff *skb = rx->skb;
a7767f95 1964 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1965 struct tid_ampdu_rx *tid_agg_rx;
1966 u16 start_seq_num;
1967 u16 tid;
1968
a7767f95 1969 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1970 return RX_CONTINUE;
71364716 1971
a7767f95 1972 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1973 struct {
1974 __le16 control, start_seq_num;
1975 } __packed bar_data;
1976
71364716 1977 if (!rx->sta)
a02ae758 1978 return RX_DROP_MONITOR;
8ae5977f
JB		 1979
1980 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1981 &bar_data, sizeof(bar_data)))
1982 return RX_DROP_MONITOR;
1983
8ae5977f 1984 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1985
1986 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1987 if (!tid_agg_rx)
a02ae758 1988 return RX_DROP_MONITOR;
71364716 1989
8ae5977f 1990 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1991
1992 /* reset session timer */
20ad19d0
JB		 1993 if (tid_agg_rx->timeout)
1994 mod_timer(&tid_agg_rx->session_timer,
1995 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1996
dd318575 1997 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1998 /* release stored frames up to start of BAR */
24a8fdad 1999 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2000 spin_unlock(&tid_agg_rx->reorder_lock);
2001
a02ae758
JB		 2002 kfree_skb(skb);
2003 return RX_QUEUED;
71364716
RR		 2004 }
2005
08daecae
JB		 2006 /*
2007 * After this point, we only want management frames,
2008 * so we can drop all remaining control frames to
2009 * cooked monitor interfaces.
2010 */
2011 return RX_DROP_MONITOR;
71364716
RR		 2012}
2013
f4f727a6
JM		 2014static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2015 struct ieee80211_mgmt *mgmt,
2016 size_t len)
fea14732
JM		 2017{
2018 struct ieee80211_local *local = sdata->local;
2019 struct sk_buff *skb;
2020 struct ieee80211_mgmt *resp;
2021
47846c9b 2022 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2023 /* Not to own unicast address */
2024 return;
2025 }
2026
46900298
JB		 2027 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2028 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2029 /* Not from the current AP or not associated yet. */
fea14732
JM		 2030 return;
2031 }
2032
2033 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2034 /* Too short SA Query request frame */
2035 return;
2036 }
2037
2038 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2039 if (skb == NULL)
2040 return;
2041
2042 skb_reserve(skb, local->hw.extra_tx_headroom);
2043 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2044 memset(resp, 0, 24);
2045 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2046 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2047 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2048 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2049 IEEE80211_STYPE_ACTION);
2050 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2051 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2052 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2053 memcpy(resp->u.action.u.sa_query.trans_id,
2054 mgmt->u.action.u.sa_query.trans_id,
2055 WLAN_SA_QUERY_TR_ID_LEN);
2056
62ae67be 2057 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2058}
2059
2e161f78
JB		 2060static ieee80211_rx_result debug_noinline
2061ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2062{
2063 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2064 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2065
2066 /*
2067 * From here on, look only at management frames.
2068 * Data and control frames are already handled,
2069 * and unknown (reserved) frames are useless.
2070 */
2071 if (rx->skb->len < 24)
2072 return RX_DROP_MONITOR;
2073
2074 if (!ieee80211_is_mgmt(mgmt->frame_control))
2075 return RX_DROP_MONITOR;
2076
554891e6 2077 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2078 return RX_DROP_MONITOR;
2079
2080 if (ieee80211_drop_unencrypted_mgmt(rx))
2081 return RX_DROP_UNUSABLE;
2082
2083 return RX_CONTINUE;
2084}
2085
de1ede7a
JB		 2086static ieee80211_rx_result debug_noinline
2087ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2088{
2089 struct ieee80211_local *local = rx->local;
eb9fb5b8 2090 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2091 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2092 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2093 int len = rx->skb->len;
2094
2095 if (!ieee80211_is_action(mgmt->frame_control))
2096 return RX_CONTINUE;
2097
026331c4
JM		 2098 /* drop too small frames */
2099 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2100 return RX_DROP_UNUSABLE;
de1ede7a 2101
026331c4 2102 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2103 return RX_DROP_UNUSABLE;
de1ede7a 2104
554891e6 2105 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2106 return RX_DROP_UNUSABLE;
97ebe12a 2107
de1ede7a
JB		 2108 switch (mgmt->u.action.category) {
2109 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2110 /*
2111 * The aggregation code is not prepared to handle
2112 * anything but STA/AP due to the BSSID handling;
2113 * IBSS could work in the code but isn't supported
2114 * by drivers or the standard.
2115 */
2116 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2117 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2118 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2119 break;
8abd3f9b 2120
026331c4
JM		 2121 /* verify action_code is present */
2122 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2123 break;
2124
de1ede7a
JB		 2125 switch (mgmt->u.action.u.addba_req.action_code) {
2126 case WLAN_ACTION_ADDBA_REQ:
2127 if (len < (IEEE80211_MIN_ACTION_SIZE +
2128 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2129 goto invalid;
2130 break;
de1ede7a
JB		 2131 case WLAN_ACTION_ADDBA_RESP:
2132 if (len < (IEEE80211_MIN_ACTION_SIZE +
2133 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2134 goto invalid;
2135 break;
de1ede7a
JB		 2136 case WLAN_ACTION_DELBA:
2137 if (len < (IEEE80211_MIN_ACTION_SIZE +
2138 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2139 goto invalid;
2140 break;
2141 default:
2142 goto invalid;
de1ede7a 2143 }
bed7ee6e 2144
8b58ff83 2145 goto queue;
39192c0b
JB		 2146 case WLAN_CATEGORY_SPECTRUM_MGMT:
2147 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2148 break;
46900298
JB		 2149
2150 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2151 break;
46900298 2152
026331c4
JM		 2153 /* verify action_code is present */
2154 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2155 break;
2156
39192c0b
JB		 2157 switch (mgmt->u.action.u.measurement.action_code) {
2158 case WLAN_ACTION_SPCT_MSR_REQ:
2159 if (len < (IEEE80211_MIN_ACTION_SIZE +
2160 sizeof(mgmt->u.action.u.measurement)))
84040805 2161 break;
39192c0b 2162 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2163 goto handled;
c481ec97
S		 2164 case WLAN_ACTION_SPCT_CHL_SWITCH:
2165 if (len < (IEEE80211_MIN_ACTION_SIZE +
2166 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2167 break;
c481ec97 2168
cc32abd4 2169 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2170 break;
cc32abd4 2171
46900298 2172 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2173 break;
c481ec97 2174
8b58ff83 2175 goto queue;
39192c0b
JB		 2176 }
2177 break;
fea14732
JM		 2178 case WLAN_CATEGORY_SA_QUERY:
2179 if (len < (IEEE80211_MIN_ACTION_SIZE +
2180 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2181 break;
2182
fea14732
JM		 2183 switch (mgmt->u.action.u.sa_query.action) {
2184 case WLAN_ACTION_SA_QUERY_REQUEST:
2185 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2186 break;
fea14732 2187 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2188 goto handled;
fea14732
JM		 2189 }
2190 break;
97ad9139 2191 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2192 if (!ieee80211_vif_is_mesh(&sdata->vif))
2193 break;
8b58ff83 2194 goto queue;
c7108a71
JC		 2195 case WLAN_CATEGORY_MESH_PATH_SEL:
2196 if (!mesh_path_sel_is_hwmp(sdata))
2197 break;
2198 goto queue;
84040805 2199 }
026331c4 2200
2e161f78
JB		 2201 return RX_CONTINUE;
2202
bed7ee6e 2203 invalid:
554891e6 2204 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2205 /* will return in the next handlers */
2206 return RX_CONTINUE;
2207
2208 handled:
2209 if (rx->sta)
2210 rx->sta->rx_packets++;
2211 dev_kfree_skb(rx->skb);
2212 return RX_QUEUED;
2213
2214 queue:
2215 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2216 skb_queue_tail(&sdata->skb_queue, rx->skb);
2217 ieee80211_queue_work(&local->hw, &sdata->work);
2218 if (rx->sta)
2219 rx->sta->rx_packets++;
2220 return RX_QUEUED;
2221}
2222
2223static ieee80211_rx_result debug_noinline
2224ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2225{
554891e6 2226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2227
2228 /* skip known-bad action frames and return them in the next handler */
554891e6 2229 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2230 return RX_CONTINUE;
d7907448 2231
026331c4
JM		 2232 /*
2233 * Getting here means the kernel doesn't know how to handle
2234 * it, but maybe userspace does ... include returned frames
2235 * so userspace can register for those to know whether ones
2236 * it transmitted were processed or returned.
2237 */
026331c4 2238
2e161f78
JB		 2239 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2240 rx->skb->data, rx->skb->len,
2241 GFP_ATOMIC)) {
2242 if (rx->sta)
2243 rx->sta->rx_packets++;
2244 dev_kfree_skb(rx->skb);
2245 return RX_QUEUED;
2246 }
2247
2248
2249 return RX_CONTINUE;
2250}
2251
2252static ieee80211_rx_result debug_noinline
2253ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2254{
2255 struct ieee80211_local *local = rx->local;
2256 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2257 struct sk_buff *nskb;
2258 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2259 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2260
2261 if (!ieee80211_is_action(mgmt->frame_control))
2262 return RX_CONTINUE;
2263
2264 /*
2265 * For AP mode, hostapd is responsible for handling any action
2266 * frames that we didn't handle, including returning unknown
2267 * ones. For all other modes we will return them to the sender,
2268 * setting the 0x80 bit in the action category, as required by
2269 * 802.11-2007 7.3.1.11.
2270 * Newer versions of hostapd shall also use the management frame
2271 * registration mechanisms, but older ones still use cooked
2272 * monitor interfaces so push all frames there.
2273 */
554891e6 2274 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2275 (sdata->vif.type == NL80211_IFTYPE_AP ||
2276 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2277 return RX_DROP_MONITOR;
026331c4 2278
84040805
JB		 2279 /* do not return rejected action frames */
2280 if (mgmt->u.action.category & 0x80)
2281 return RX_DROP_UNUSABLE;
2282
2283 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2284 GFP_ATOMIC);
2285 if (nskb) {
292b4df6 2286 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2287
292b4df6
JL		 2288 nmgmt->u.action.category |= 0x80;
2289 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2290 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2291
2292 memset(nskb->cb, 0, sizeof(nskb->cb));
2293
2294 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2295 }
39192c0b
JB		 2296 dev_kfree_skb(rx->skb);
2297 return RX_QUEUED;
de1ede7a
JB		 2298}
2299
49461622 2300static ieee80211_rx_result debug_noinline
5cf121c3 2301ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2302{
eb9fb5b8 2303 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2304 ieee80211_rx_result rxs;
77a121c3
JB		 2305 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2306 __le16 stype;
571ecf67 2307
af6b6374
JB		 2308 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2309 if (rxs != RX_CONTINUE)
2310 return rxs;
2311
77a121c3 2312 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2313
77a121c3
JB		 2314 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2315 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2316 sdata->vif.type != NL80211_IFTYPE_STATION)
2317 return RX_DROP_MONITOR;
472dbc45 2318
77a121c3
JB		 2319 switch (stype) {
2320 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2321 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2322 /* process for all: mesh, mlme, ibss */
2323 break;
2324 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2325 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2326 if (is_multicast_ether_addr(mgmt->da) &&
2327 !is_broadcast_ether_addr(mgmt->da))
2328 return RX_DROP_MONITOR;
2329
77a121c3
JB		 2330 /* process only for station */
2331 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2332 return RX_DROP_MONITOR;
2333 break;
2334 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2335 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2336 /* process only for ibss */
2337 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2338 return RX_DROP_MONITOR;
2339 break;
2340 default:
2341 return RX_DROP_MONITOR;
2342 }
f9d540ee 2343
77a121c3 2344 /* queue up frame and kick off work to process it */
c1475ca9 2345 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2346 skb_queue_tail(&sdata->skb_queue, rx->skb);
2347 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2348 if (rx->sta)
2349 rx->sta->rx_packets++;
46900298 2350
77a121c3 2351 return RX_QUEUED;
571ecf67
JB		 2352}
2353
3b8d81e0 2354static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2355 struct ieee80211_rx_data *rx)
571ecf67 2356{
a7767f95
HH		 2357 int keyidx;
2358 unsigned int hdrlen;
571ecf67 2359
a7767f95 2360 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2361 if (rx->skb->len >= hdrlen + 4)
2362 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2363 else
2364 keyidx = -1;
2365
8944b79f 2366 if (!rx->sta) {
aa0daf0e
JB		 2367 /*
2368 * Some hardware seem to generate incorrect Michael MIC
2369 * reports; ignore them to avoid triggering countermeasures.
2370 */
af2ced6a 2371 return;
571ecf67
JB		 2372 }
2373
a7767f95 2374 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2375 return;
571ecf67 2376
05c914fe 2377 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2378 /*
2379 * APs with pairwise keys should never receive Michael MIC
2380 * errors for non-zero keyidx because these are reserved for
2381 * group keys and only the AP is sending real multicast
2382 * frames in the BSS.
2383 */
af2ced6a 2384 return;
571ecf67
JB		 2385 }
2386
a7767f95
HH		 2387 if (!ieee80211_is_data(hdr->frame_control) &&
2388 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2389 return;
571ecf67 2390
e6d6e342
JB		 2391 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2392 GFP_ATOMIC);
571ecf67
JB		 2393}
2394
5cf121c3 2395/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2396static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2397 struct ieee80211_rate *rate)
3d30d949
MW		 2398{
2399 struct ieee80211_sub_if_data *sdata;
2400 struct ieee80211_local *local = rx->local;
2401 struct ieee80211_rtap_hdr {
2402 struct ieee80211_radiotap_header hdr;
2403 u8 flags;
5f0b7de5 2404 u8 rate_or_pad;
3d30d949
MW		 2405 __le16 chan_freq;
2406 __le16 chan_flags;
bc10502d 2407 } __packed *rthdr;
3d30d949
MW		 2408 struct sk_buff *skb = rx->skb, *skb2;
2409 struct net_device *prev_dev = NULL;
eb9fb5b8 2410 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2411
554891e6
JB		 2412 /*
2413 * If cooked monitor has been processed already, then
2414 * don't do it again. If not, set the flag.
2415 */
2416 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2417 goto out_free_skb;
554891e6 2418 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2419
3d30d949
MW		 2420 if (skb_headroom(skb) < sizeof(*rthdr) &&
2421 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2422 goto out_free_skb;
2423
2424 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2425 memset(rthdr, 0, sizeof(*rthdr));
2426 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2427 rthdr->hdr.it_present =
2428 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2429 (1 << IEEE80211_RADIOTAP_CHANNEL));
2430
5f0b7de5
JB		 2431 if (rate) {
2432 rthdr->rate_or_pad = rate->bitrate / 5;
2433 rthdr->hdr.it_present |=
2434 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2435 }
3d30d949
MW		 2436 rthdr->chan_freq = cpu_to_le16(status->freq);
2437
2438 if (status->band == IEEE80211_BAND_5GHZ)
2439 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2440 IEEE80211_CHAN_5GHZ);
2441 else
2442 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2443 IEEE80211_CHAN_2GHZ);
2444
2445 skb_set_mac_header(skb, 0);
2446 skb->ip_summed = CHECKSUM_UNNECESSARY;
2447 skb->pkt_type = PACKET_OTHERHOST;
2448 skb->protocol = htons(ETH_P_802_2);
2449
2450 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2451 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2452 continue;
2453
05c914fe 2454 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2455 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2456 continue;
2457
2458 if (prev_dev) {
2459 skb2 = skb_clone(skb, GFP_ATOMIC);
2460 if (skb2) {
2461 skb2->dev = prev_dev;
5548a8a1 2462 netif_receive_skb(skb2);
3d30d949
MW		 2463 }
2464 }
2465
2466 prev_dev = sdata->dev;
2467 sdata->dev->stats.rx_packets++;
2468 sdata->dev->stats.rx_bytes += skb->len;
2469 }
2470
2471 if (prev_dev) {
2472 skb->dev = prev_dev;
5548a8a1 2473 netif_receive_skb(skb);
554891e6
JB		 2474 return;
2475 }
3d30d949
MW		 2476
2477 out_free_skb:
2478 dev_kfree_skb(skb);
2479}
2480
aa0c8636
CL		 2481static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2482 ieee80211_rx_result res)
2483{
2484 switch (res) {
2485 case RX_DROP_MONITOR:
2486 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2487 if (rx->sta)
2488 rx->sta->rx_dropped++;
2489 /* fall through */
2490 case RX_CONTINUE: {
2491 struct ieee80211_rate *rate = NULL;
2492 struct ieee80211_supported_band *sband;
2493 struct ieee80211_rx_status *status;
2494
2495 status = IEEE80211_SKB_RXCB((rx->skb));
2496
2497 sband = rx->local->hw.wiphy->bands[status->band];
2498 if (!(status->flag & RX_FLAG_HT))
2499 rate = &sband->bitrates[status->rate_idx];
2500
2501 ieee80211_rx_cooked_monitor(rx, rate);
2502 break;
2503 }
2504 case RX_DROP_UNUSABLE:
2505 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2506 if (rx->sta)
2507 rx->sta->rx_dropped++;
2508 dev_kfree_skb(rx->skb);
2509 break;
2510 case RX_QUEUED:
2511 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2512 break;
2513 }
2514}
571ecf67 2515
24a8fdad 2516static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2517{
58905290 2518 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2519 struct sk_buff *skb;
8944b79f 2520
e32f85f7
LCC		 2521#define CALL_RXH(rxh) \
2522 do { \
2523 res = rxh(rx); \
2524 if (res != RX_CONTINUE) \
2569a826 2525 goto rxh_next; \
e32f85f7 2526 } while (0);
49461622 2527
24a8fdad
CL		 2528 spin_lock(&rx->local->rx_skb_queue.lock);
2529 if (rx->local->running_rx_handler)
2530 goto unlock;
2531
2532 rx->local->running_rx_handler = true;
2533
2534 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2535 spin_unlock(&rx->local->rx_skb_queue.lock);
2536
2569a826
JB		 2537 /*
2538 * all the other fields are valid across frames
2539 * that belong to an aMPDU since they are on the
2540 * same TID from the same station
2541 */
2542 rx->skb = skb;
554891e6 2543 rx->flags = 0;
2569a826
JB		 2544
2545 CALL_RXH(ieee80211_rx_h_decrypt)
2546 CALL_RXH(ieee80211_rx_h_check_more_data)
2547 CALL_RXH(ieee80211_rx_h_sta_process)
2548 CALL_RXH(ieee80211_rx_h_defragment)
2549 CALL_RXH(ieee80211_rx_h_ps_poll)
2550 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2551 /* must be after MMIC verify so header is counted in MPDU mic */
2552 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2553 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2554#ifdef CONFIG_MAC80211_MESH
aa0c8636 2555 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2556 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2557#endif
2569a826 2558 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2559 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2560 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2561 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2562 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2563 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2564 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2565
aa0c8636
CL		 2566 rxh_next:
2567 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2568 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2569#undef CALL_RXH
aa0c8636 2570 }
24a8fdad
CL		 2571
2572 rx->local->running_rx_handler = false;
2573
2574 unlock:
2575 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2576}
2577
4406c376 2578static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2579{
aa0c8636
CL		 2580 ieee80211_rx_result res = RX_DROP_MONITOR;
2581
aa0c8636
CL		 2582#define CALL_RXH(rxh) \
2583 do { \
2584 res = rxh(rx); \
2585 if (res != RX_CONTINUE) \
2586 goto rxh_next; \
2587 } while (0);
2588
2589 CALL_RXH(ieee80211_rx_h_passive_scan)
2590 CALL_RXH(ieee80211_rx_h_check)
2591
24a8fdad 2592 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2593
24a8fdad 2594 ieee80211_rx_handlers(rx);
aa0c8636 2595 return;
49461622 2596
2569a826 2597 rxh_next:
aa0c8636
CL		 2598 ieee80211_rx_handlers_result(rx, res);
2599
2600#undef CALL_RXH
58905290
JB		 2601}
2602
2bff8ebf 2603/*
dd318575
JB		 2604 * This function makes calls into the RX path, therefore
2605 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2606 */
2607void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2608{
554891e6
JB		 2609 struct ieee80211_rx_data rx = {
2610 .sta = sta,
2611 .sdata = sta->sdata,
2612 .local = sta->local,
2613 .queue = tid,
2614 };
2c15a0cf
CL		 2615 struct tid_ampdu_rx *tid_agg_rx;
2616
2617 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2618 if (!tid_agg_rx)
2619 return;
2bff8ebf 2620
2c15a0cf 2621 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2622 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2623 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2624
24a8fdad 2625 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2626}
2627
571ecf67
JB		 2628/* main receive path */
2629
20b01f80 2630static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2631 struct ieee80211_hdr *hdr)
2632{
20b01f80 2633 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2634 struct sk_buff *skb = rx->skb;
2635 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2636 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2637 int multicast = is_multicast_ether_addr(hdr->addr1);
2638
51fb61e7 2639 switch (sdata->vif.type) {
05c914fe 2640 case NL80211_IFTYPE_STATION:
9bc383de 2641 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2642 return 0;
77fdaa12 2643 if (!multicast &&
47846c9b 2644 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2645 if (!(sdata->dev->flags & IFF_PROMISC) ||
2646 sdata->u.mgd.use_4addr)
23a24def 2647 return 0;
554891e6 2648 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2649 }
2650 break;
05c914fe 2651 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2652 if (!bssid)
2653 return 0;
a7767f95 2654 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2655 return 1;
87291c02 2656 }
46900298 2657 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2658 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2659 return 0;
554891e6 2660 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2661 } else if (!multicast &&
47846c9b 2662 compare_ether_addr(sdata->vif.addr,
23a24def 2663 hdr->addr1) != 0) {
4150c572 2664 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2665 return 0;
554891e6 2666 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2667 } else if (!rx->sta) {
2668 int rate_idx;
eb9fb5b8 2669 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2670 rate_idx = 0; /* TODO: HT rates */
2671 else
eb9fb5b8 2672 rate_idx = status->rate_idx;
34e89507
JB		 2673 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2674 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2675 }
23a24def 2676 break;
05c914fe 2677 case NL80211_IFTYPE_MESH_POINT:
6032f934 2678 if (!multicast &&
47846c9b 2679 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2680 hdr->addr1) != 0) {
2681 if (!(sdata->dev->flags & IFF_PROMISC))
2682 return 0;
2683
554891e6 2684 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2685 }
2686 break;
05c914fe
JB		 2687 case NL80211_IFTYPE_AP_VLAN:
2688 case NL80211_IFTYPE_AP:
23a24def 2689 if (!bssid) {
47846c9b 2690 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2691 hdr->addr1))
2692 return 0;
2693 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2694 sdata->vif.addr)) {
771bbd09
AN		 2695 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2696 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2697 return 0;
554891e6 2698 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2699 }
23a24def 2700 break;
05c914fe 2701 case NL80211_IFTYPE_WDS:
a7767f95 2702 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2703 return 0;
2704 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2705 return 0;
2706 break;
2ca27bcf 2707 default:
fb1c1cd6
JB		 2708 /* should never get here */
2709 WARN_ON(1);
2710 break;
23a24def
JB		 2711 }
2712
2713 return 1;
2714}
2715
4406c376
JB		 2716/*
2717 * This function returns whether or not the SKB
2718 * was destined for RX processing or not, which,
2719 * if consume is true, is equivalent to whether
2720 * or not the skb was consumed.
2721 */
2722static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2723 struct sk_buff *skb, bool consume)
2724{
2725 struct ieee80211_local *local = rx->local;
2726 struct ieee80211_sub_if_data *sdata = rx->sdata;
2727 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2728 struct ieee80211_hdr *hdr = (void *)skb->data;
2729 int prepares;
2730
2731 rx->skb = skb;
554891e6 2732 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2733 prepares = prepare_for_handlers(rx, hdr);
2734
2735 if (!prepares)
2736 return false;
2737
2738 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2739 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2740 ieee80211_rx_michael_mic_report(hdr, rx);
2741 return false;
2742 }
2743
2744 if (!consume) {
2745 skb = skb_copy(skb, GFP_ATOMIC);
2746 if (!skb) {
2747 if (net_ratelimit())
2748 wiphy_debug(local->hw.wiphy,
b305dae4 2749 "failed to copy skb for %s\n",
4406c376
JB		 2750 sdata->name);
2751 return true;
2752 }
2753
2754 rx->skb = skb;
2755 }
2756
2757 ieee80211_invoke_rx_handlers(rx);
2758 return true;
2759}
2760
571ecf67 2761/*
6368e4b1
RR		 2762 * This is the actual Rx frames handler. as it blongs to Rx path it must
2763 * be called with rcu_read_lock protection.
571ecf67 2764 */
71ebb4aa 2765static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2766 struct sk_buff *skb)
571ecf67 2767{
554891e6 2768 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2769 struct ieee80211_local *local = hw_to_local(hw);
2770 struct ieee80211_sub_if_data *sdata;
571ecf67 2771 struct ieee80211_hdr *hdr;
e3cf8b3f 2772 __le16 fc;
5cf121c3 2773 struct ieee80211_rx_data rx;
4406c376 2774 struct ieee80211_sub_if_data *prev;
56af3268 2775 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2776 int err = 0;
571ecf67 2777
e3cf8b3f 2778 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2779 memset(&rx, 0, sizeof(rx));
2780 rx.skb = skb;
2781 rx.local = local;
72abd81b 2782
e3cf8b3f 2783 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2784 local->dot11ReceivedFragmentCount++;
571ecf67 2785
142b9f50 2786 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2787 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2788 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2789
e3cf8b3f
ZY		 2790 if (ieee80211_is_mgmt(fc))
2791 err = skb_linearize(skb);
2792 else
2793 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2794
2795 if (err) {
2796 dev_kfree_skb(skb);
2797 return;
2798 }
2799
2800 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2801 ieee80211_parse_qos(&rx);
d1c3a37c 2802 ieee80211_verify_alignment(&rx);
38f3714d 2803
e3cf8b3f 2804 if (ieee80211_is_data(fc)) {
56af3268 2805 prev_sta = NULL;
4406c376 2806
abe60632 2807 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2808 if (!prev_sta) {
2809 prev_sta = sta;
2810 continue;
2811 }
2812
2813 rx.sta = prev_sta;
2814 rx.sdata = prev_sta->sdata;
4406c376 2815 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2816
56af3268 2817 prev_sta = sta;
4406c376 2818 }
56af3268
BG		 2819
2820 if (prev_sta) {
2821 rx.sta = prev_sta;
2822 rx.sdata = prev_sta->sdata;
2823
4406c376 2824 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2825 return;
8e26d5ad 2826 goto out;
56af3268 2827 }
4406c376
JB		 2828 }
2829
4b0dd98e 2830 prev = NULL;
b2e7771e 2831
4b0dd98e
JB		 2832 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2833 if (!ieee80211_sdata_running(sdata))
2834 continue;
340e11f3 2835
4b0dd98e
JB		 2836 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2837 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2838 continue;
340e11f3 2839
4b0dd98e
JB		 2840 /*
2841 * frame is destined for this interface, but if it's
2842 * not also for the previous one we handle that after
2843 * the loop to avoid copying the SKB once too much
2844 */
4bb29f8c 2845
4b0dd98e 2846 if (!prev) {
abe60632 2847 prev = sdata;
4b0dd98e 2848 continue;
340e11f3 2849 }
4bb29f8c 2850
4b0dd98e
JB		 2851 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2852 rx.sdata = prev;
2853 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2854
4b0dd98e
JB		 2855 prev = sdata;
2856 }
2857
2858 if (prev) {
2859 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2860 rx.sdata = prev;
4406c376 2861
4b0dd98e
JB		 2862 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2863 return;
571ecf67 2864 }
4406c376 2865
8e26d5ad 2866 out:
4406c376 2867 dev_kfree_skb(skb);
571ecf67 2868}
6368e4b1
RR		 2869
2870/*
2871 * This is the receive path handler. It is called by a low level driver when an
2872 * 802.11 MPDU is received from the hardware.
2873 */
103bf9f7 2874void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2875{
2876 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2877 struct ieee80211_rate *rate = NULL;
2878 struct ieee80211_supported_band *sband;
f1d58c25 2879 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2880
d20ef63d
JB		 2881 WARN_ON_ONCE(softirq_count() == 0);
2882
77a980dc
JB		 2883 if (WARN_ON(status->band < 0 ||
2884 status->band >= IEEE80211_NUM_BANDS))
2885 goto drop;
8318d78a
JB		 2886
2887 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2888 if (WARN_ON(!sband))
2889 goto drop;
8318d78a 2890
89c3a8ac
JB		 2891 /*
2892 * If we're suspending, it is possible although not too likely
2893 * that we'd be receiving frames after having already partially
2894 * quiesced the stack. We can't process such frames then since
2895 * that might, for example, cause stations to be added or other
2896 * driver callbacks be invoked.
2897 */
77a980dc
JB		 2898 if (unlikely(local->quiescing || local->suspended))
2899 goto drop;
89c3a8ac 2900
ea77f12f
JB		 2901 /*
2902 * The same happens when we're not even started,
2903 * but that's worth a warning.
2904 */
77a980dc
JB		 2905 if (WARN_ON(!local->started))
2906 goto drop;
ea77f12f 2907
fc885189 2908 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2909 /*
fc885189
JB		 2910 * Validate the rate, unless a PLCP error means that
2911 * we probably can't have a valid rate here anyway.
e5d6eb83 2912 */
fc885189
JB		 2913
2914 if (status->flag & RX_FLAG_HT) {
2915 /*
2916 * rate_idx is MCS index, which can be [0-76]
2917 * as documented on:
2918 *
2919 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2920 *
2921 * Anything else would be some sort of driver or
2922 * hardware error. The driver should catch hardware
2923 * errors.
2924 */
2925 if (WARN((status->rate_idx < 0 ||
2926 status->rate_idx > 76),
2927 "Rate marked as an HT rate but passed "
2928 "status->rate_idx is not "
2929 "an MCS index [0-76]: %d (0x%02x)\n",
2930 status->rate_idx,
2931 status->rate_idx))
2932 goto drop;
2933 } else {
2934 if (WARN_ON(status->rate_idx < 0 ||
2935 status->rate_idx >= sband->n_bitrates))
2936 goto drop;
2937 rate = &sband->bitrates[status->rate_idx];
2938 }
0fb8ca45 2939 }
6368e4b1 2940
554891e6
JB		 2941 status->rx_flags = 0;
2942
6368e4b1
RR		 2943 /*
2944 * key references and virtual interfaces are protected using RCU
2945 * and this requires that we are in a read-side RCU section during
2946 * receive processing
2947 */
2948 rcu_read_lock();
2949
2950 /*
2951 * Frames with failed FCS/PLCP checksum are not returned,
2952 * all other frames are returned without radiotap header
2953 * if it was previously present.
2954 * Also, frames with less than 16 bytes are dropped.
2955 */
f1d58c25 2956 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2957 if (!skb) {
2958 rcu_read_unlock();
2959 return;
2960 }
2961
e1e54068
JB		 2962 ieee80211_tpt_led_trig_rx(local,
2963 ((struct ieee80211_hdr *)skb->data)->frame_control,
2964 skb->len);
071d9ac2 2965 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2966
2967 rcu_read_unlock();
77a980dc
JB		 2968
2969 return;
2970 drop:
2971 kfree_skb(skb);
6368e4b1 2972}
103bf9f7 2973EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2974
2975/* This is a version of the rx handler that can be called from hard irq
2976 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2977void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2978{
2979 struct ieee80211_local *local = hw_to_local(hw);
2980
2981 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2982
571ecf67
JB		 2983 skb->pkt_type = IEEE80211_RX_MSG;
2984 skb_queue_tail(&local->skb_queue, skb);
2985 tasklet_schedule(&local->tasklet);
2986}
2987EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)