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cfg80211: add a field for the bitrate of the last rx data packet from a station
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2
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 *
384 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
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);
46900298 1159 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1160 sta->last_rx = jiffies;
b291ba11
JB		 1161 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1162 /*
33b64eb2
LCC		 1163 * Mesh beacons will update last_rx when if they are found to
1164 * match the current local configuration when processed.
571ecf67 1165 */
b291ba11 1166 sta->last_rx = jiffies;
571ecf67
JB		 1167 }
1168
554891e6 1169 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1170 return RX_CONTINUE;
571ecf67 1171
3cf335d5
KV		 1172 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1173 ieee80211_sta_rx_notify(rx->sdata, hdr);
1174
571ecf67
JB		 1175 sta->rx_fragments++;
1176 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1177 sta->last_signal = status->signal;
541a45a1 1178 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1179
72eaa43a
JB		 1180 /*
1181 * Change STA power saving mode only at the end of a frame
1182 * exchange sequence.
1183 */
d057e5a3
AN		 1184 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1185 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1186 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1187 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1188 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1189 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1190 /*
1191 * Ignore doze->wake transitions that are
1192 * indicated by non-data frames, the standard
1193 * is unclear here, but for example going to
1194 * PS mode and then scanning would cause a
1195 * doze->wake transition for the probe request,
1196 * and that is clearly undesirable.
1197 */
1198 if (ieee80211_is_data(hdr->frame_control) &&
1199 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1200 ap_sta_ps_end(sta);
72eaa43a
JB		 1201 } else {
1202 if (ieee80211_has_pm(hdr->frame_control))
1203 ap_sta_ps_start(sta);
1204 }
571ecf67
JB		 1205 }
1206
22403def
JB		 1207 /*
1208 * Drop (qos-)data::nullfunc frames silently, since they
1209 * are used only to control station power saving mode.
1210 */
1211 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1212 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1213 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1214
1215 /*
1216 * If we receive a 4-addr nullfunc frame from a STA
1217 * that was not moved to a 4-addr STA vlan yet, drop
1218 * the frame to the monitor interface, to make sure
1219 * that hostapd sees it
1220 */
1221 if (ieee80211_has_a4(hdr->frame_control) &&
1222 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1223 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1224 !rx->sdata->u.vlan.sta)))
1225 return RX_DROP_MONITOR;
22403def
JB		 1226 /*
1227 * Update counter and free packet here to avoid
1228 * counting this as a dropped packed.
1229 */
571ecf67
JB		 1230 sta->rx_packets++;
1231 dev_kfree_skb(rx->skb);
9ae54c84 1232 return RX_QUEUED;
571ecf67
JB		 1233 }
1234
9ae54c84 1235 return RX_CONTINUE;
571ecf67
JB		 1236} /* ieee80211_rx_h_sta_process */
1237
571ecf67
JB		 1238static inline struct ieee80211_fragment_entry *
1239ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1240 unsigned int frag, unsigned int seq, int rx_queue,
1241 struct sk_buff **skb)
1242{
1243 struct ieee80211_fragment_entry *entry;
1244 int idx;
1245
1246 idx = sdata->fragment_next;
1247 entry = &sdata->fragments[sdata->fragment_next++];
1248 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1249 sdata->fragment_next = 0;
1250
1251 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1252#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1253 struct ieee80211_hdr *hdr =
1254 (struct ieee80211_hdr *) entry->skb_list.next->data;
1255 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1256 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1257 "addr1=%pM addr2=%pM\n",
47846c9b 1258 sdata->name, idx,
571ecf67 1259 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1260 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1261#endif
571ecf67
JB		 1262 __skb_queue_purge(&entry->skb_list);
1263 }
1264
1265 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1266 *skb = NULL;
1267 entry->first_frag_time = jiffies;
1268 entry->seq = seq;
1269 entry->rx_queue = rx_queue;
1270 entry->last_frag = frag;
1271 entry->ccmp = 0;
1272 entry->extra_len = 0;
1273
1274 return entry;
1275}
1276
1277static inline struct ieee80211_fragment_entry *
1278ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1279 unsigned int frag, unsigned int seq,
571ecf67
JB		 1280 int rx_queue, struct ieee80211_hdr *hdr)
1281{
1282 struct ieee80211_fragment_entry *entry;
1283 int i, idx;
1284
1285 idx = sdata->fragment_next;
1286 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1287 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1288
1289 idx--;
1290 if (idx < 0)
1291 idx = IEEE80211_FRAGMENT_MAX - 1;
1292
1293 entry = &sdata->fragments[idx];
1294 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1295 entry->rx_queue != rx_queue ||
1296 entry->last_frag + 1 != frag)
1297 continue;
1298
b73d70ad 1299 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1300
b73d70ad
HH		 1301 /*
1302 * Check ftype and addresses are equal, else check next fragment
1303 */
1304 if (((hdr->frame_control ^ f_hdr->frame_control) &
1305 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1306 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1307 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1308 continue;
1309
ab46623e 1310 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1311 __skb_queue_purge(&entry->skb_list);
1312 continue;
1313 }
1314 return entry;
1315 }
1316
1317 return NULL;
1318}
1319
49461622 1320static ieee80211_rx_result debug_noinline
5cf121c3 1321ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1322{
1323 struct ieee80211_hdr *hdr;
1324 u16 sc;
358c8d9d 1325 __le16 fc;
571ecf67
JB		 1326 unsigned int frag, seq;
1327 struct ieee80211_fragment_entry *entry;
1328 struct sk_buff *skb;
554891e6 1329 struct ieee80211_rx_status *status;
571ecf67 1330
b73d70ad 1331 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1332 fc = hdr->frame_control;
571ecf67
JB		 1333 sc = le16_to_cpu(hdr->seq_ctrl);
1334 frag = sc & IEEE80211_SCTL_FRAG;
1335
358c8d9d 1336 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1337 (rx->skb)->len < 24 ||
1338 is_multicast_ether_addr(hdr->addr1))) {
1339 /* not fragmented */
1340 goto out;
1341 }
1342 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1343
e3cf8b3f
ZY		 1344 if (skb_linearize(rx->skb))
1345 return RX_DROP_UNUSABLE;
1346
058897a4
AK		 1347 /*
1348 * skb_linearize() might change the skb->data and
1349 * previously cached variables (in this case, hdr) need to
1350 * be refreshed with the new data.
1351 */
1352 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1353 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1354
1355 if (frag == 0) {
1356 /* This is the first fragment of a new frame. */
1357 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1358 rx->queue, &(rx->skb));
97359d12 1359 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1360 ieee80211_has_protected(fc)) {
9190252c
JM		 1361 int queue = ieee80211_is_mgmt(fc) ?
1362 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1363 /* Store CCMP PN so that we can verify that the next
1364 * fragment has a sequential PN value. */
1365 entry->ccmp = 1;
1366 memcpy(entry->last_pn,
9190252c 1367 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1368 CCMP_PN_LEN);
1369 }
9ae54c84 1370 return RX_QUEUED;
571ecf67
JB		 1371 }
1372
1373 /* This is a fragment for a frame that should already be pending in
1374 * fragment cache. Add this fragment to the end of the pending entry.
1375 */
b73d70ad 1376 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1377 if (!entry) {
1378 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1379 return RX_DROP_MONITOR;
571ecf67
JB		 1380 }
1381
1382 /* Verify that MPDUs within one MSDU have sequential PN values.
1383 * (IEEE 802.11i, 8.3.3.4.5) */
1384 if (entry->ccmp) {
1385 int i;
1386 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1387 int queue;
97359d12 1388 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1389 return RX_DROP_UNUSABLE;
571ecf67
JB		 1390 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1391 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1392 pn[i]++;
1393 if (pn[i])
1394 break;
1395 }
9190252c
JM		 1396 queue = ieee80211_is_mgmt(fc) ?
1397 NUM_RX_DATA_QUEUES : rx->queue;
1398 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1399 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1400 return RX_DROP_UNUSABLE;
571ecf67
JB		 1401 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1402 }
1403
358c8d9d 1404 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1405 __skb_queue_tail(&entry->skb_list, rx->skb);
1406 entry->last_frag = frag;
1407 entry->extra_len += rx->skb->len;
358c8d9d 1408 if (ieee80211_has_morefrags(fc)) {
571ecf67 1409 rx->skb = NULL;
9ae54c84 1410 return RX_QUEUED;
571ecf67
JB		 1411 }
1412
1413 rx->skb = __skb_dequeue(&entry->skb_list);
1414 if (skb_tailroom(rx->skb) < entry->extra_len) {
1415 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1416 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1417 GFP_ATOMIC))) {
1418 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1419 __skb_queue_purge(&entry->skb_list);
e4c26add 1420 return RX_DROP_UNUSABLE;
571ecf67
JB		 1421 }
1422 }
1423 while ((skb = __skb_dequeue(&entry->skb_list))) {
1424 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1425 dev_kfree_skb(skb);
1426 }
1427
1428 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1429 status = IEEE80211_SKB_RXCB(rx->skb);
1430 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1431
1432 out:
1433 if (rx->sta)
1434 rx->sta->rx_packets++;
1435 if (is_multicast_ether_addr(hdr->addr1))
1436 rx->local->dot11MulticastReceivedFrameCount++;
1437 else
1438 ieee80211_led_rx(rx->local);
9ae54c84 1439 return RX_CONTINUE;
571ecf67
JB		 1440}
1441
49461622 1442static ieee80211_rx_result debug_noinline
5cf121c3 1443ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1444{
af818581 1445 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1446 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1447 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1448
358c8d9d 1449 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1450 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1451 return RX_CONTINUE;
571ecf67 1452
05c914fe
JB		 1453 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1454 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1455 return RX_DROP_UNUSABLE;
98f0b0a3 1456
af818581
JB		 1457 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1458 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1459 else
1460 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1461
9ae54c84 1462 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1463 * count as an dropped frame. */
1464 dev_kfree_skb(rx->skb);
1465
9ae54c84 1466 return RX_QUEUED;
571ecf67
JB		 1467}
1468
49461622 1469static ieee80211_rx_result debug_noinline
5cf121c3 1470ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1471{
6e0d114d 1472 u8 *data = rx->skb->data;
238f74a2 1473 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1474
238f74a2 1475 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1476 return RX_CONTINUE;
6e0d114d
JB		 1477
1478 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1479 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1480 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1481 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1482 /* change frame type to non QOS */
238f74a2 1483 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1484
9ae54c84 1485 return RX_CONTINUE;
6e0d114d
JB		 1486}
1487
76ee65bf 1488static int
5cf121c3 1489ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1490{
07346f81 1491 if (unlikely(!rx->sta ||
f4ea83dd 1492 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1493 return -EACCES;
571ecf67 1494
76ee65bf 1495 return 0;
571ecf67
JB		 1496}
1497
76ee65bf 1498static int
358c8d9d 1499ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1500{
eb9fb5b8
JB		 1501 struct sk_buff *skb = rx->skb;
1502 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1503
3017b80b 1504 /*
7848ba7d
JB		 1505 * Pass through unencrypted frames if the hardware has
1506 * decrypted them already.
3017b80b 1507 */
eb9fb5b8 1508 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1509 return 0;
571ecf67
JB		 1510
1511 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1512 if (unlikely(!ieee80211_has_protected(fc) &&
1513 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1514 ieee80211_is_data(fc) &&
b3fc9c6c 1515 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1516 return -EACCES;
bef5d1c7
JB		 1517
1518 return 0;
1519}
1520
1521static int
1522ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1523{
1524 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1525 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1526 __le16 fc = hdr->frame_control;
bef5d1c7 1527
e3efca0a
JM		 1528 /*
1529 * Pass through unencrypted frames if the hardware has
1530 * decrypted them already.
1531 */
1532 if (status->flag & RX_FLAG_DECRYPTED)
1533 return 0;
bef5d1c7 1534
f2ca3ea4 1535 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1536 if (unlikely(!ieee80211_has_protected(fc) &&
1537 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1538 rx->key)) {
1539 if (ieee80211_is_deauth(fc))
1540 cfg80211_send_unprot_deauth(rx->sdata->dev,
1541 rx->skb->data,
1542 rx->skb->len);
1543 else if (ieee80211_is_disassoc(fc))
1544 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1545 rx->skb->data,
1546 rx->skb->len);
f2ca3ea4 1547 return -EACCES;
cf4e594e 1548 }
f2ca3ea4 1549 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1550 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1551 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1552 if (ieee80211_is_deauth(fc))
1553 cfg80211_send_unprot_deauth(rx->sdata->dev,
1554 rx->skb->data,
1555 rx->skb->len);
1556 else if (ieee80211_is_disassoc(fc))
1557 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1558 rx->skb->data,
1559 rx->skb->len);
f2ca3ea4 1560 return -EACCES;
cf4e594e 1561 }
f2ca3ea4
JM		 1562 /*
1563 * When using MFP, Action frames are not allowed prior to
1564 * having configured keys.
1565 */
1566 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1567 ieee80211_is_robust_mgmt_frame(
1568 (struct ieee80211_hdr *) rx->skb->data)))
1569 return -EACCES;
1570 }
b3fc9c6c 1571
76ee65bf 1572 return 0;
571ecf67
JB		 1573}
1574
76ee65bf 1575static int
e31a16d6 1576__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1577{
eb9fb5b8 1578 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1580 bool check_port_control = false;
1581 struct ethhdr *ehdr;
1582 int ret;
f14543ee 1583
9bc383de
JB		 1584 if (ieee80211_has_a4(hdr->frame_control) &&
1585 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1586 return -1;
9bc383de 1587
fbb327c5
FF		 1588 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1589 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1590
1591 if (!sdata->u.mgd.use_4addr)
1592 return -1;
1593 else
1594 check_port_control = true;
1595 }
1596
9bc383de 1597 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1598 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1599 return -1;
571ecf67 1600
fbb327c5
FF		 1601 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1602 if (ret < 0 || !check_port_control)
1603 return ret;
1604
1605 ehdr = (struct ethhdr *) rx->skb->data;
1606 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1607 return -1;
1608
1609 return 0;
76ee65bf 1610}
571ecf67 1611
ce3edf6d
JB		 1612/*
1613 * requires that rx->skb is a frame with ethernet header
1614 */
358c8d9d 1615static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1616{
c97c23e3 1617 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1618 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1619 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1620
1621 /*
1622 * Allow EAPOL frames to us/the PAE group address regardless
1623 * of whether the frame was encrypted or not.
1624 */
a621fa4d 1625 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1626 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1627 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1628 return true;
1629
1630 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1631 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1632 return false;
1633
1634 return true;
1635}
1636
1637/*
1638 * requires that rx->skb is a frame with ethernet header
1639 */
76ee65bf 1640static void
5cf121c3 1641ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1642{
eb9fb5b8
JB		 1643 struct ieee80211_sub_if_data *sdata = rx->sdata;
1644 struct net_device *dev = sdata->dev;
76ee65bf 1645 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1646 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1647 struct sta_info *dsta;
554891e6 1648 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1649
76ee65bf
RR		 1650 skb = rx->skb;
1651 xmit_skb = NULL;
571ecf67 1652
05c914fe
JB		 1653 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1654 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1655 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1656 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1657 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1658 if (is_multicast_ether_addr(ehdr->h_dest)) {
1659 /*
1660 * send multicast frames both to higher layers in
1661 * local net stack and back to the wireless medium
1662 */
76ee65bf
RR		 1663 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1664 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1665 printk(KERN_DEBUG "%s: failed to clone "
1666 "multicast frame\n", dev->name);
1667 } else {
abe60632
JB		 1668 dsta = sta_info_get(sdata, skb->data);
1669 if (dsta) {
ce3edf6d
JB		 1670 /*
1671 * The destination station is associated to
1672 * this AP (in this VLAN), so send the frame
1673 * directly to it and do not pass it to local
1674 * net stack.
571ecf67 1675 */
76ee65bf 1676 xmit_skb = skb;
571ecf67
JB		 1677 skb = NULL;
1678 }
571ecf67
JB		 1679 }
1680 }
1681
1682 if (skb) {
d1c3a37c
JB		 1683 int align __maybe_unused;
1684
59d9cb07 1685#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1686 /*
1687 * 'align' will only take the values 0 or 2 here
1688 * since all frames are required to be aligned
1689 * to 2-byte boundaries when being passed to
1690 * mac80211. That also explains the __skb_push()
1691 * below.
1692 */
dacb6f1d 1693 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1694 if (align) {
1695 if (WARN_ON(skb_headroom(skb) < 3)) {
1696 dev_kfree_skb(skb);
1697 skb = NULL;
1698 } else {
1699 u8 *data = skb->data;
8ce0b589
ZY		 1700 size_t len = skb_headlen(skb);
1701 skb->data -= align;
1702 memmove(skb->data, data, len);
1703 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1704 }
1705 }
1706#endif
1707
1708 if (skb) {
1709 /* deliver to local stack */
1710 skb->protocol = eth_type_trans(skb, dev);
1711 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1712 netif_receive_skb(skb);
d1c3a37c 1713 }
571ecf67
JB		 1714 }
1715
76ee65bf 1716 if (xmit_skb) {
571ecf67 1717 /* send to wireless media */
f831e909 1718 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1719 skb_reset_network_header(xmit_skb);
1720 skb_reset_mac_header(xmit_skb);
76ee65bf 1721 dev_queue_xmit(xmit_skb);
571ecf67 1722 }
76ee65bf
RR		 1723}
1724
49461622 1725static ieee80211_rx_result debug_noinline
5cf121c3 1726ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1727{
eb9fb5b8 1728 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1729 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1730 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1731 __le16 fc = hdr->frame_control;
eaf85ca7 1732 struct sk_buff_head frame_list;
554891e6 1733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1734
358c8d9d 1735 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1736 return RX_CONTINUE;
fd4c7f2f 1737
358c8d9d 1738 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1739 return RX_DROP_MONITOR;
fd4c7f2f 1740
554891e6 1741 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1742 return RX_CONTINUE;
fd4c7f2f 1743
eaf85ca7
ZY		 1744 if (ieee80211_has_a4(hdr->frame_control) &&
1745 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1746 !rx->sdata->u.vlan.sta)
e4c26add 1747 return RX_DROP_UNUSABLE;
fd4c7f2f 1748
eaf85ca7
ZY		 1749 if (is_multicast_ether_addr(hdr->addr1) &&
1750 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1751 rx->sdata->u.vlan.sta) ||
1752 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1753 rx->sdata->u.mgd.use_4addr)))
e4c26add 1754 return RX_DROP_UNUSABLE;
fd4c7f2f 1755
eaf85ca7
ZY		 1756 skb->dev = dev;
1757 __skb_queue_head_init(&frame_list);
fd4c7f2f 1758
e3cf8b3f
ZY		 1759 if (skb_linearize(skb))
1760 return RX_DROP_UNUSABLE;
1761
eaf85ca7
ZY		 1762 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1763 rx->sdata->vif.type,
1764 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1765
eaf85ca7
ZY		 1766 while (!skb_queue_empty(&frame_list)) {
1767 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1768
358c8d9d 1769 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1770 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1771 continue;
1772 }
eaf85ca7
ZY		 1773 dev->stats.rx_packets++;
1774 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1775
1776 ieee80211_deliver_skb(rx);
1777 }
1778
9ae54c84 1779 return RX_QUEUED;
fd4c7f2f
RR		 1780}
1781
bf94e17b 1782#ifdef CONFIG_MAC80211_MESH
b0dee578 1783static ieee80211_rx_result
e32f85f7
LCC		 1784ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1785{
1786 struct ieee80211_hdr *hdr;
1787 struct ieee80211s_hdr *mesh_hdr;
1788 unsigned int hdrlen;
1789 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1790 struct ieee80211_local *local = rx->local;
eb9fb5b8 1791 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1792 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1793
1794 hdr = (struct ieee80211_hdr *) skb->data;
1795 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1796 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1797
1798 if (!ieee80211_is_data(hdr->frame_control))
1799 return RX_CONTINUE;
1800
1801 if (!mesh_hdr->ttl)
1802 /* illegal frame */
1803 return RX_DROP_MONITOR;
1804
43b7b314 1805 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1806 struct mesh_path *mppath;
43b7b314
JC		 1807 char *proxied_addr;
1808 char *mpp_addr;
1809
1810 if (is_multicast_ether_addr(hdr->addr1)) {
1811 mpp_addr = hdr->addr3;
1812 proxied_addr = mesh_hdr->eaddr1;
1813 } else {
1814 mpp_addr = hdr->addr4;
1815 proxied_addr = mesh_hdr->eaddr2;
1816 }
79617dee 1817
79617dee 1818 rcu_read_lock();
43b7b314 1819 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1820 if (!mppath) {
43b7b314 1821 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1822 } else {
1823 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1824 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1825 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1826 spin_unlock_bh(&mppath->state_lock);
1827 }
1828 rcu_read_unlock();
1829 }
1830
3c5772a5
JC		 1831 /* Frame has reached destination. Don't forward */
1832 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1833 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1834 return RX_CONTINUE;
1835
1836 mesh_hdr->ttl--;
1837
554891e6 1838 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1839 if (!mesh_hdr->ttl)
472dbc45 1840 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1841 dropped_frames_ttl);
1842 else {
1843 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1844 struct ieee80211_tx_info *info;
1845
e32f85f7
LCC		 1846 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1847
1848 if (!fwd_skb && net_ratelimit())
1849 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1850 sdata->name);
919bbad5 1851 if (!fwd_skb)
b51aff05 1852 goto out;
e32f85f7
LCC		 1853
1854 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1855 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1856 info = IEEE80211_SKB_CB(fwd_skb);
1857 memset(info, 0, sizeof(*info));
1858 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1859 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1860 skb_set_queue_mapping(skb,
1861 ieee80211_select_queue(rx->sdata, fwd_skb));
1862 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1863 if (is_multicast_ether_addr(fwd_hdr->addr1))
1864 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1865 fwded_mcast);
1866 else {
3c5772a5
JC		 1867 int err;
1868 /*
1869 * Save TA to addr1 to send TA a path error if a
1870 * suitable next hop is not found
1871 */
1872 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1873 ETH_ALEN);
3c5772a5 1874 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1875 /* Failed to immediately resolve next hop:
1876 * fwded frame was dropped or will be added
1877 * later to the pending skb queue. */
1878 if (err)
1879 return RX_DROP_MONITOR;
c8a61a7d
DW		 1880
1881 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1882 fwded_unicast);
249b405c
JC		 1883 }
1884 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1885 fwded_frames);
3b8d81e0 1886 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1887 }
1888 }
1889
b51aff05 1890 out:
3c5772a5 1891 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1892 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1893 return RX_CONTINUE;
1894 else
1895 return RX_DROP_MONITOR;
1896}
bf94e17b 1897#endif
e32f85f7 1898
49461622 1899static ieee80211_rx_result debug_noinline
5cf121c3 1900ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1901{
eb9fb5b8 1902 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1903 struct ieee80211_local *local = rx->local;
eb9fb5b8 1904 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1905 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1906 __le16 fc = hdr->frame_control;
ce3edf6d 1907 int err;
76ee65bf 1908
358c8d9d 1909 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1910 return RX_CONTINUE;
76ee65bf 1911
358c8d9d 1912 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1913 return RX_DROP_MONITOR;
76ee65bf 1914
f14543ee
FF		 1915 /*
1916 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1917 * that a 4-addr station can be detected and moved into a separate VLAN
1918 */
1919 if (ieee80211_has_a4(hdr->frame_control) &&
1920 sdata->vif.type == NL80211_IFTYPE_AP)
1921 return RX_DROP_MONITOR;
1922
e31a16d6 1923 err = __ieee80211_data_to_8023(rx);
76ee65bf 1924 if (unlikely(err))
e4c26add 1925 return RX_DROP_UNUSABLE;
76ee65bf 1926
358c8d9d 1927 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1928 return RX_DROP_MONITOR;
ce3edf6d 1929
76ee65bf
RR		 1930 rx->skb->dev = dev;
1931
1932 dev->stats.rx_packets++;
1933 dev->stats.rx_bytes += rx->skb->len;
1934
08ca944e 1935 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 1936 !is_multicast_ether_addr(
1937 ((struct ethhdr *)rx->skb->data)->h_dest) &&
1938 (!local->scanning &&
1939 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 1940 mod_timer(&local->dynamic_ps_timer, jiffies +
1941 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1942 }
1943
76ee65bf 1944 ieee80211_deliver_skb(rx);
571ecf67 1945
9ae54c84 1946 return RX_QUEUED;
571ecf67
JB		 1947}
1948
49461622 1949static ieee80211_rx_result debug_noinline
24a8fdad 1950ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1951{
1952 struct ieee80211_local *local = rx->local;
1953 struct ieee80211_hw *hw = &local->hw;
1954 struct sk_buff *skb = rx->skb;
a7767f95 1955 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1956 struct tid_ampdu_rx *tid_agg_rx;
1957 u16 start_seq_num;
1958 u16 tid;
1959
a7767f95 1960 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1961 return RX_CONTINUE;
71364716 1962
a7767f95 1963 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1964 struct {
1965 __le16 control, start_seq_num;
1966 } __packed bar_data;
1967
71364716 1968 if (!rx->sta)
a02ae758 1969 return RX_DROP_MONITOR;
8ae5977f
JB		 1970
1971 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1972 &bar_data, sizeof(bar_data)))
1973 return RX_DROP_MONITOR;
1974
8ae5977f 1975 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1976
1977 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1978 if (!tid_agg_rx)
a02ae758 1979 return RX_DROP_MONITOR;
71364716 1980
8ae5977f 1981 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1982
1983 /* reset session timer */
20ad19d0
JB		 1984 if (tid_agg_rx->timeout)
1985 mod_timer(&tid_agg_rx->session_timer,
1986 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1987
dd318575 1988 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1989 /* release stored frames up to start of BAR */
24a8fdad 1990 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 1991 spin_unlock(&tid_agg_rx->reorder_lock);
1992
a02ae758
JB		 1993 kfree_skb(skb);
1994 return RX_QUEUED;
71364716
RR		 1995 }
1996
08daecae
JB		 1997 /*
1998 * After this point, we only want management frames,
1999 * so we can drop all remaining control frames to
2000 * cooked monitor interfaces.
2001 */
2002 return RX_DROP_MONITOR;
71364716
RR		 2003}
2004
f4f727a6
JM		 2005static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2006 struct ieee80211_mgmt *mgmt,
2007 size_t len)
fea14732
JM		 2008{
2009 struct ieee80211_local *local = sdata->local;
2010 struct sk_buff *skb;
2011 struct ieee80211_mgmt *resp;
2012
47846c9b 2013 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2014 /* Not to own unicast address */
2015 return;
2016 }
2017
46900298
JB		 2018 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2019 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2020 /* Not from the current AP or not associated yet. */
fea14732
JM		 2021 return;
2022 }
2023
2024 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2025 /* Too short SA Query request frame */
2026 return;
2027 }
2028
2029 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2030 if (skb == NULL)
2031 return;
2032
2033 skb_reserve(skb, local->hw.extra_tx_headroom);
2034 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2035 memset(resp, 0, 24);
2036 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2037 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2038 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2039 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2040 IEEE80211_STYPE_ACTION);
2041 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2042 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2043 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2044 memcpy(resp->u.action.u.sa_query.trans_id,
2045 mgmt->u.action.u.sa_query.trans_id,
2046 WLAN_SA_QUERY_TR_ID_LEN);
2047
62ae67be 2048 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2049}
2050
2e161f78
JB		 2051static ieee80211_rx_result debug_noinline
2052ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2053{
2054 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2055 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2056
2057 /*
2058 * From here on, look only at management frames.
2059 * Data and control frames are already handled,
2060 * and unknown (reserved) frames are useless.
2061 */
2062 if (rx->skb->len < 24)
2063 return RX_DROP_MONITOR;
2064
2065 if (!ieee80211_is_mgmt(mgmt->frame_control))
2066 return RX_DROP_MONITOR;
2067
554891e6 2068 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2069 return RX_DROP_MONITOR;
2070
2071 if (ieee80211_drop_unencrypted_mgmt(rx))
2072 return RX_DROP_UNUSABLE;
2073
2074 return RX_CONTINUE;
2075}
2076
de1ede7a
JB		 2077static ieee80211_rx_result debug_noinline
2078ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2079{
2080 struct ieee80211_local *local = rx->local;
eb9fb5b8 2081 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2082 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2083 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2084 int len = rx->skb->len;
2085
2086 if (!ieee80211_is_action(mgmt->frame_control))
2087 return RX_CONTINUE;
2088
026331c4
JM		 2089 /* drop too small frames */
2090 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2091 return RX_DROP_UNUSABLE;
de1ede7a 2092
026331c4 2093 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2094 return RX_DROP_UNUSABLE;
de1ede7a 2095
554891e6 2096 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2097 return RX_DROP_UNUSABLE;
97ebe12a 2098
de1ede7a
JB		 2099 switch (mgmt->u.action.category) {
2100 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2101 /*
2102 * The aggregation code is not prepared to handle
2103 * anything but STA/AP due to the BSSID handling;
2104 * IBSS could work in the code but isn't supported
2105 * by drivers or the standard.
2106 */
2107 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2108 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2109 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2110 break;
8abd3f9b 2111
026331c4
JM		 2112 /* verify action_code is present */
2113 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2114 break;
2115
de1ede7a
JB		 2116 switch (mgmt->u.action.u.addba_req.action_code) {
2117 case WLAN_ACTION_ADDBA_REQ:
2118 if (len < (IEEE80211_MIN_ACTION_SIZE +
2119 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2120 goto invalid;
2121 break;
de1ede7a
JB		 2122 case WLAN_ACTION_ADDBA_RESP:
2123 if (len < (IEEE80211_MIN_ACTION_SIZE +
2124 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2125 goto invalid;
2126 break;
de1ede7a
JB		 2127 case WLAN_ACTION_DELBA:
2128 if (len < (IEEE80211_MIN_ACTION_SIZE +
2129 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2130 goto invalid;
2131 break;
2132 default:
2133 goto invalid;
de1ede7a 2134 }
bed7ee6e 2135
8b58ff83 2136 goto queue;
39192c0b
JB		 2137 case WLAN_CATEGORY_SPECTRUM_MGMT:
2138 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2139 break;
46900298
JB		 2140
2141 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2142 break;
46900298 2143
026331c4
JM		 2144 /* verify action_code is present */
2145 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2146 break;
2147
39192c0b
JB		 2148 switch (mgmt->u.action.u.measurement.action_code) {
2149 case WLAN_ACTION_SPCT_MSR_REQ:
2150 if (len < (IEEE80211_MIN_ACTION_SIZE +
2151 sizeof(mgmt->u.action.u.measurement)))
84040805 2152 break;
39192c0b 2153 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2154 goto handled;
c481ec97
S		 2155 case WLAN_ACTION_SPCT_CHL_SWITCH:
2156 if (len < (IEEE80211_MIN_ACTION_SIZE +
2157 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2158 break;
c481ec97 2159
cc32abd4 2160 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2161 break;
cc32abd4 2162
46900298 2163 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2164 break;
c481ec97 2165
8b58ff83 2166 goto queue;
39192c0b
JB		 2167 }
2168 break;
fea14732
JM		 2169 case WLAN_CATEGORY_SA_QUERY:
2170 if (len < (IEEE80211_MIN_ACTION_SIZE +
2171 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2172 break;
2173
fea14732
JM		 2174 switch (mgmt->u.action.u.sa_query.action) {
2175 case WLAN_ACTION_SA_QUERY_REQUEST:
2176 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2177 break;
fea14732 2178 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2179 goto handled;
fea14732
JM		 2180 }
2181 break;
97ad9139 2182 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2183 if (!ieee80211_vif_is_mesh(&sdata->vif))
2184 break;
8b58ff83 2185 goto queue;
c7108a71
JC		 2186 case WLAN_CATEGORY_MESH_PATH_SEL:
2187 if (!mesh_path_sel_is_hwmp(sdata))
2188 break;
2189 goto queue;
84040805 2190 }
026331c4 2191
2e161f78
JB		 2192 return RX_CONTINUE;
2193
bed7ee6e 2194 invalid:
554891e6 2195 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2196 /* will return in the next handlers */
2197 return RX_CONTINUE;
2198
2199 handled:
2200 if (rx->sta)
2201 rx->sta->rx_packets++;
2202 dev_kfree_skb(rx->skb);
2203 return RX_QUEUED;
2204
2205 queue:
2206 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2207 skb_queue_tail(&sdata->skb_queue, rx->skb);
2208 ieee80211_queue_work(&local->hw, &sdata->work);
2209 if (rx->sta)
2210 rx->sta->rx_packets++;
2211 return RX_QUEUED;
2212}
2213
2214static ieee80211_rx_result debug_noinline
2215ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2216{
554891e6 2217 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2218
2219 /* skip known-bad action frames and return them in the next handler */
554891e6 2220 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2221 return RX_CONTINUE;
d7907448 2222
026331c4
JM		 2223 /*
2224 * Getting here means the kernel doesn't know how to handle
2225 * it, but maybe userspace does ... include returned frames
2226 * so userspace can register for those to know whether ones
2227 * it transmitted were processed or returned.
2228 */
026331c4 2229
2e161f78
JB		 2230 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2231 rx->skb->data, rx->skb->len,
2232 GFP_ATOMIC)) {
2233 if (rx->sta)
2234 rx->sta->rx_packets++;
2235 dev_kfree_skb(rx->skb);
2236 return RX_QUEUED;
2237 }
2238
2239
2240 return RX_CONTINUE;
2241}
2242
2243static ieee80211_rx_result debug_noinline
2244ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2245{
2246 struct ieee80211_local *local = rx->local;
2247 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2248 struct sk_buff *nskb;
2249 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2250 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2251
2252 if (!ieee80211_is_action(mgmt->frame_control))
2253 return RX_CONTINUE;
2254
2255 /*
2256 * For AP mode, hostapd is responsible for handling any action
2257 * frames that we didn't handle, including returning unknown
2258 * ones. For all other modes we will return them to the sender,
2259 * setting the 0x80 bit in the action category, as required by
2260 * 802.11-2007 7.3.1.11.
2261 * Newer versions of hostapd shall also use the management frame
2262 * registration mechanisms, but older ones still use cooked
2263 * monitor interfaces so push all frames there.
2264 */
554891e6 2265 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2266 (sdata->vif.type == NL80211_IFTYPE_AP ||
2267 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2268 return RX_DROP_MONITOR;
026331c4 2269
84040805
JB		 2270 /* do not return rejected action frames */
2271 if (mgmt->u.action.category & 0x80)
2272 return RX_DROP_UNUSABLE;
2273
2274 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2275 GFP_ATOMIC);
2276 if (nskb) {
292b4df6 2277 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2278
292b4df6
JL		 2279 nmgmt->u.action.category |= 0x80;
2280 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2281 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2282
2283 memset(nskb->cb, 0, sizeof(nskb->cb));
2284
2285 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2286 }
39192c0b
JB		 2287 dev_kfree_skb(rx->skb);
2288 return RX_QUEUED;
de1ede7a
JB		 2289}
2290
49461622 2291static ieee80211_rx_result debug_noinline
5cf121c3 2292ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2293{
eb9fb5b8 2294 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2295 ieee80211_rx_result rxs;
77a121c3
JB		 2296 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2297 __le16 stype;
571ecf67 2298
af6b6374
JB		 2299 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2300 if (rxs != RX_CONTINUE)
2301 return rxs;
2302
77a121c3 2303 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2304
77a121c3
JB		 2305 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2306 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2307 sdata->vif.type != NL80211_IFTYPE_STATION)
2308 return RX_DROP_MONITOR;
472dbc45 2309
77a121c3
JB		 2310 switch (stype) {
2311 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2312 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2313 /* process for all: mesh, mlme, ibss */
2314 break;
2315 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2316 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2317 if (is_multicast_ether_addr(mgmt->da) &&
2318 !is_broadcast_ether_addr(mgmt->da))
2319 return RX_DROP_MONITOR;
2320
77a121c3
JB		 2321 /* process only for station */
2322 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2323 return RX_DROP_MONITOR;
2324 break;
2325 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2326 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2327 /* process only for ibss */
2328 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2329 return RX_DROP_MONITOR;
2330 break;
2331 default:
2332 return RX_DROP_MONITOR;
2333 }
f9d540ee 2334
77a121c3 2335 /* queue up frame and kick off work to process it */
c1475ca9 2336 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2337 skb_queue_tail(&sdata->skb_queue, rx->skb);
2338 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2339 if (rx->sta)
2340 rx->sta->rx_packets++;
46900298 2341
77a121c3 2342 return RX_QUEUED;
571ecf67
JB		 2343}
2344
3b8d81e0 2345static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2346 struct ieee80211_rx_data *rx)
571ecf67 2347{
a7767f95
HH		 2348 int keyidx;
2349 unsigned int hdrlen;
571ecf67 2350
a7767f95 2351 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2352 if (rx->skb->len >= hdrlen + 4)
2353 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2354 else
2355 keyidx = -1;
2356
8944b79f 2357 if (!rx->sta) {
aa0daf0e
JB		 2358 /*
2359 * Some hardware seem to generate incorrect Michael MIC
2360 * reports; ignore them to avoid triggering countermeasures.
2361 */
af2ced6a 2362 return;
571ecf67
JB		 2363 }
2364
a7767f95 2365 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2366 return;
571ecf67 2367
05c914fe 2368 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2369 /*
2370 * APs with pairwise keys should never receive Michael MIC
2371 * errors for non-zero keyidx because these are reserved for
2372 * group keys and only the AP is sending real multicast
2373 * frames in the BSS.
2374 */
af2ced6a 2375 return;
571ecf67
JB		 2376 }
2377
a7767f95
HH		 2378 if (!ieee80211_is_data(hdr->frame_control) &&
2379 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2380 return;
571ecf67 2381
e6d6e342
JB		 2382 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2383 GFP_ATOMIC);
571ecf67
JB		 2384}
2385
5cf121c3 2386/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2387static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2388 struct ieee80211_rate *rate)
3d30d949
MW		 2389{
2390 struct ieee80211_sub_if_data *sdata;
2391 struct ieee80211_local *local = rx->local;
2392 struct ieee80211_rtap_hdr {
2393 struct ieee80211_radiotap_header hdr;
2394 u8 flags;
5f0b7de5 2395 u8 rate_or_pad;
3d30d949
MW		 2396 __le16 chan_freq;
2397 __le16 chan_flags;
bc10502d 2398 } __packed *rthdr;
3d30d949
MW		 2399 struct sk_buff *skb = rx->skb, *skb2;
2400 struct net_device *prev_dev = NULL;
eb9fb5b8 2401 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2402
554891e6
JB		 2403 /*
2404 * If cooked monitor has been processed already, then
2405 * don't do it again. If not, set the flag.
2406 */
2407 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2408 goto out_free_skb;
554891e6 2409 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2410
3d30d949
MW		 2411 if (skb_headroom(skb) < sizeof(*rthdr) &&
2412 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2413 goto out_free_skb;
2414
2415 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2416 memset(rthdr, 0, sizeof(*rthdr));
2417 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2418 rthdr->hdr.it_present =
2419 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2420 (1 << IEEE80211_RADIOTAP_CHANNEL));
2421
5f0b7de5
JB		 2422 if (rate) {
2423 rthdr->rate_or_pad = rate->bitrate / 5;
2424 rthdr->hdr.it_present |=
2425 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2426 }
3d30d949
MW		 2427 rthdr->chan_freq = cpu_to_le16(status->freq);
2428
2429 if (status->band == IEEE80211_BAND_5GHZ)
2430 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2431 IEEE80211_CHAN_5GHZ);
2432 else
2433 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2434 IEEE80211_CHAN_2GHZ);
2435
2436 skb_set_mac_header(skb, 0);
2437 skb->ip_summed = CHECKSUM_UNNECESSARY;
2438 skb->pkt_type = PACKET_OTHERHOST;
2439 skb->protocol = htons(ETH_P_802_2);
2440
2441 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2442 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2443 continue;
2444
05c914fe 2445 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2446 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2447 continue;
2448
2449 if (prev_dev) {
2450 skb2 = skb_clone(skb, GFP_ATOMIC);
2451 if (skb2) {
2452 skb2->dev = prev_dev;
5548a8a1 2453 netif_receive_skb(skb2);
3d30d949
MW		 2454 }
2455 }
2456
2457 prev_dev = sdata->dev;
2458 sdata->dev->stats.rx_packets++;
2459 sdata->dev->stats.rx_bytes += skb->len;
2460 }
2461
2462 if (prev_dev) {
2463 skb->dev = prev_dev;
5548a8a1 2464 netif_receive_skb(skb);
554891e6
JB		 2465 return;
2466 }
3d30d949
MW		 2467
2468 out_free_skb:
2469 dev_kfree_skb(skb);
2470}
2471
aa0c8636
CL		 2472static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2473 ieee80211_rx_result res)
2474{
2475 switch (res) {
2476 case RX_DROP_MONITOR:
2477 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2478 if (rx->sta)
2479 rx->sta->rx_dropped++;
2480 /* fall through */
2481 case RX_CONTINUE: {
2482 struct ieee80211_rate *rate = NULL;
2483 struct ieee80211_supported_band *sband;
2484 struct ieee80211_rx_status *status;
2485
2486 status = IEEE80211_SKB_RXCB((rx->skb));
2487
2488 sband = rx->local->hw.wiphy->bands[status->band];
2489 if (!(status->flag & RX_FLAG_HT))
2490 rate = &sband->bitrates[status->rate_idx];
2491
2492 ieee80211_rx_cooked_monitor(rx, rate);
2493 break;
2494 }
2495 case RX_DROP_UNUSABLE:
2496 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2497 if (rx->sta)
2498 rx->sta->rx_dropped++;
2499 dev_kfree_skb(rx->skb);
2500 break;
2501 case RX_QUEUED:
2502 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2503 break;
2504 }
2505}
571ecf67 2506
24a8fdad 2507static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2508{
58905290 2509 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2510 struct sk_buff *skb;
8944b79f 2511
e32f85f7
LCC		 2512#define CALL_RXH(rxh) \
2513 do { \
2514 res = rxh(rx); \
2515 if (res != RX_CONTINUE) \
2569a826 2516 goto rxh_next; \
e32f85f7 2517 } while (0);
49461622 2518
24a8fdad
CL		 2519 spin_lock(&rx->local->rx_skb_queue.lock);
2520 if (rx->local->running_rx_handler)
2521 goto unlock;
2522
2523 rx->local->running_rx_handler = true;
2524
2525 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2526 spin_unlock(&rx->local->rx_skb_queue.lock);
2527
2569a826
JB		 2528 /*
2529 * all the other fields are valid across frames
2530 * that belong to an aMPDU since they are on the
2531 * same TID from the same station
2532 */
2533 rx->skb = skb;
554891e6 2534 rx->flags = 0;
2569a826
JB		 2535
2536 CALL_RXH(ieee80211_rx_h_decrypt)
2537 CALL_RXH(ieee80211_rx_h_check_more_data)
2538 CALL_RXH(ieee80211_rx_h_sta_process)
2539 CALL_RXH(ieee80211_rx_h_defragment)
2540 CALL_RXH(ieee80211_rx_h_ps_poll)
2541 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2542 /* must be after MMIC verify so header is counted in MPDU mic */
2543 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2544 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2545#ifdef CONFIG_MAC80211_MESH
aa0c8636 2546 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2547 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2548#endif
2569a826 2549 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2550 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2551 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2552 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2553 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2554 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2555 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2556
aa0c8636
CL		 2557 rxh_next:
2558 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2559 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2560#undef CALL_RXH
aa0c8636 2561 }
24a8fdad
CL		 2562
2563 rx->local->running_rx_handler = false;
2564
2565 unlock:
2566 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2567}
2568
4406c376 2569static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2570{
aa0c8636
CL		 2571 ieee80211_rx_result res = RX_DROP_MONITOR;
2572
aa0c8636
CL		 2573#define CALL_RXH(rxh) \
2574 do { \
2575 res = rxh(rx); \
2576 if (res != RX_CONTINUE) \
2577 goto rxh_next; \
2578 } while (0);
2579
2580 CALL_RXH(ieee80211_rx_h_passive_scan)
2581 CALL_RXH(ieee80211_rx_h_check)
2582
24a8fdad 2583 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2584
24a8fdad 2585 ieee80211_rx_handlers(rx);
aa0c8636 2586 return;
49461622 2587
2569a826 2588 rxh_next:
aa0c8636
CL		 2589 ieee80211_rx_handlers_result(rx, res);
2590
2591#undef CALL_RXH
58905290
JB		 2592}
2593
2bff8ebf 2594/*
dd318575
JB		 2595 * This function makes calls into the RX path, therefore
2596 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2597 */
2598void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2599{
554891e6
JB		 2600 struct ieee80211_rx_data rx = {
2601 .sta = sta,
2602 .sdata = sta->sdata,
2603 .local = sta->local,
2604 .queue = tid,
2605 };
2c15a0cf
CL		 2606 struct tid_ampdu_rx *tid_agg_rx;
2607
2608 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2609 if (!tid_agg_rx)
2610 return;
2bff8ebf 2611
2c15a0cf 2612 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2613 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2614 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2615
24a8fdad 2616 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2617}
2618
571ecf67
JB		 2619/* main receive path */
2620
20b01f80 2621static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2622 struct ieee80211_hdr *hdr)
2623{
20b01f80 2624 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2625 struct sk_buff *skb = rx->skb;
2626 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2627 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2628 int multicast = is_multicast_ether_addr(hdr->addr1);
2629
51fb61e7 2630 switch (sdata->vif.type) {
05c914fe 2631 case NL80211_IFTYPE_STATION:
9bc383de 2632 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2633 return 0;
77fdaa12 2634 if (!multicast &&
47846c9b 2635 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2636 if (!(sdata->dev->flags & IFF_PROMISC) ||
2637 sdata->u.mgd.use_4addr)
23a24def 2638 return 0;
554891e6 2639 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2640 }
2641 break;
05c914fe 2642 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2643 if (!bssid)
2644 return 0;
a7767f95 2645 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2646 return 1;
87291c02 2647 }
46900298 2648 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2649 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2650 return 0;
554891e6 2651 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2652 } else if (!multicast &&
47846c9b 2653 compare_ether_addr(sdata->vif.addr,
23a24def 2654 hdr->addr1) != 0) {
4150c572 2655 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2656 return 0;
554891e6 2657 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2658 } else if (!rx->sta) {
2659 int rate_idx;
eb9fb5b8 2660 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2661 rate_idx = 0; /* TODO: HT rates */
2662 else
eb9fb5b8 2663 rate_idx = status->rate_idx;
34e89507
JB		 2664 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2665 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2666 }
23a24def 2667 break;
05c914fe 2668 case NL80211_IFTYPE_MESH_POINT:
6032f934 2669 if (!multicast &&
47846c9b 2670 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2671 hdr->addr1) != 0) {
2672 if (!(sdata->dev->flags & IFF_PROMISC))
2673 return 0;
2674
554891e6 2675 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2676 }
2677 break;
05c914fe
JB		 2678 case NL80211_IFTYPE_AP_VLAN:
2679 case NL80211_IFTYPE_AP:
23a24def 2680 if (!bssid) {
47846c9b 2681 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2682 hdr->addr1))
2683 return 0;
2684 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2685 sdata->vif.addr)) {
771bbd09
AN		 2686 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2687 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2688 return 0;
554891e6 2689 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2690 }
23a24def 2691 break;
05c914fe 2692 case NL80211_IFTYPE_WDS:
a7767f95 2693 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2694 return 0;
2695 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2696 return 0;
2697 break;
2ca27bcf 2698 default:
fb1c1cd6
JB		 2699 /* should never get here */
2700 WARN_ON(1);
2701 break;
23a24def
JB		 2702 }
2703
2704 return 1;
2705}
2706
4406c376
JB		 2707/*
2708 * This function returns whether or not the SKB
2709 * was destined for RX processing or not, which,
2710 * if consume is true, is equivalent to whether
2711 * or not the skb was consumed.
2712 */
2713static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2714 struct sk_buff *skb, bool consume)
2715{
2716 struct ieee80211_local *local = rx->local;
2717 struct ieee80211_sub_if_data *sdata = rx->sdata;
2718 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2719 struct ieee80211_hdr *hdr = (void *)skb->data;
2720 int prepares;
2721
2722 rx->skb = skb;
554891e6 2723 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2724 prepares = prepare_for_handlers(rx, hdr);
2725
2726 if (!prepares)
2727 return false;
2728
2729 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2730 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2731 ieee80211_rx_michael_mic_report(hdr, rx);
2732 return false;
2733 }
2734
2735 if (!consume) {
2736 skb = skb_copy(skb, GFP_ATOMIC);
2737 if (!skb) {
2738 if (net_ratelimit())
2739 wiphy_debug(local->hw.wiphy,
b305dae4 2740 "failed to copy skb for %s\n",
4406c376
JB		 2741 sdata->name);
2742 return true;
2743 }
2744
2745 rx->skb = skb;
2746 }
2747
2748 ieee80211_invoke_rx_handlers(rx);
2749 return true;
2750}
2751
571ecf67 2752/*
6368e4b1
RR		 2753 * This is the actual Rx frames handler. as it blongs to Rx path it must
2754 * be called with rcu_read_lock protection.
571ecf67 2755 */
71ebb4aa 2756static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2757 struct sk_buff *skb)
571ecf67 2758{
554891e6 2759 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2760 struct ieee80211_local *local = hw_to_local(hw);
2761 struct ieee80211_sub_if_data *sdata;
571ecf67 2762 struct ieee80211_hdr *hdr;
e3cf8b3f 2763 __le16 fc;
5cf121c3 2764 struct ieee80211_rx_data rx;
4406c376 2765 struct ieee80211_sub_if_data *prev;
56af3268 2766 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2767 int err = 0;
571ecf67 2768
e3cf8b3f 2769 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2770 memset(&rx, 0, sizeof(rx));
2771 rx.skb = skb;
2772 rx.local = local;
72abd81b 2773
e3cf8b3f 2774 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2775 local->dot11ReceivedFragmentCount++;
571ecf67 2776
142b9f50 2777 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2778 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2779 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2780
e3cf8b3f
ZY		 2781 if (ieee80211_is_mgmt(fc))
2782 err = skb_linearize(skb);
2783 else
2784 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2785
2786 if (err) {
2787 dev_kfree_skb(skb);
2788 return;
2789 }
2790
2791 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2792 ieee80211_parse_qos(&rx);
d1c3a37c 2793 ieee80211_verify_alignment(&rx);
38f3714d 2794
e3cf8b3f 2795 if (ieee80211_is_data(fc)) {
56af3268 2796 prev_sta = NULL;
4406c376 2797
abe60632 2798 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2799 if (!prev_sta) {
2800 prev_sta = sta;
2801 continue;
2802 }
2803
2804 rx.sta = prev_sta;
2805 rx.sdata = prev_sta->sdata;
4406c376 2806 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2807
56af3268 2808 prev_sta = sta;
4406c376 2809 }
56af3268
BG		 2810
2811 if (prev_sta) {
2812 rx.sta = prev_sta;
2813 rx.sdata = prev_sta->sdata;
2814
4406c376 2815 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2816 return;
8e26d5ad 2817 goto out;
56af3268 2818 }
4406c376
JB		 2819 }
2820
4b0dd98e 2821 prev = NULL;
b2e7771e 2822
4b0dd98e
JB		 2823 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2824 if (!ieee80211_sdata_running(sdata))
2825 continue;
340e11f3 2826
4b0dd98e
JB		 2827 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2828 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2829 continue;
340e11f3 2830
4b0dd98e
JB		 2831 /*
2832 * frame is destined for this interface, but if it's
2833 * not also for the previous one we handle that after
2834 * the loop to avoid copying the SKB once too much
2835 */
4bb29f8c 2836
4b0dd98e 2837 if (!prev) {
abe60632 2838 prev = sdata;
4b0dd98e 2839 continue;
340e11f3 2840 }
4bb29f8c 2841
4b0dd98e
JB		 2842 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2843 rx.sdata = prev;
2844 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2845
4b0dd98e
JB		 2846 prev = sdata;
2847 }
2848
2849 if (prev) {
2850 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2851 rx.sdata = prev;
4406c376 2852
4b0dd98e
JB		 2853 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2854 return;
571ecf67 2855 }
4406c376 2856
8e26d5ad 2857 out:
4406c376 2858 dev_kfree_skb(skb);
571ecf67 2859}
6368e4b1
RR		 2860
2861/*
2862 * This is the receive path handler. It is called by a low level driver when an
2863 * 802.11 MPDU is received from the hardware.
2864 */
103bf9f7 2865void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2866{
2867 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2868 struct ieee80211_rate *rate = NULL;
2869 struct ieee80211_supported_band *sband;
f1d58c25 2870 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2871
d20ef63d
JB		 2872 WARN_ON_ONCE(softirq_count() == 0);
2873
77a980dc
JB		 2874 if (WARN_ON(status->band < 0 ||
2875 status->band >= IEEE80211_NUM_BANDS))
2876 goto drop;
8318d78a
JB		 2877
2878 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2879 if (WARN_ON(!sband))
2880 goto drop;
8318d78a 2881
89c3a8ac
JB		 2882 /*
2883 * If we're suspending, it is possible although not too likely
2884 * that we'd be receiving frames after having already partially
2885 * quiesced the stack. We can't process such frames then since
2886 * that might, for example, cause stations to be added or other
2887 * driver callbacks be invoked.
2888 */
77a980dc
JB		 2889 if (unlikely(local->quiescing || local->suspended))
2890 goto drop;
89c3a8ac 2891
ea77f12f
JB		 2892 /*
2893 * The same happens when we're not even started,
2894 * but that's worth a warning.
2895 */
77a980dc
JB		 2896 if (WARN_ON(!local->started))
2897 goto drop;
ea77f12f 2898
fc885189 2899 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2900 /*
fc885189
JB		 2901 * Validate the rate, unless a PLCP error means that
2902 * we probably can't have a valid rate here anyway.
e5d6eb83 2903 */
fc885189
JB		 2904
2905 if (status->flag & RX_FLAG_HT) {
2906 /*
2907 * rate_idx is MCS index, which can be [0-76]
2908 * as documented on:
2909 *
2910 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2911 *
2912 * Anything else would be some sort of driver or
2913 * hardware error. The driver should catch hardware
2914 * errors.
2915 */
2916 if (WARN((status->rate_idx < 0 ||
2917 status->rate_idx > 76),
2918 "Rate marked as an HT rate but passed "
2919 "status->rate_idx is not "
2920 "an MCS index [0-76]: %d (0x%02x)\n",
2921 status->rate_idx,
2922 status->rate_idx))
2923 goto drop;
2924 } else {
2925 if (WARN_ON(status->rate_idx < 0 ||
2926 status->rate_idx >= sband->n_bitrates))
2927 goto drop;
2928 rate = &sband->bitrates[status->rate_idx];
2929 }
0fb8ca45 2930 }
6368e4b1 2931
554891e6
JB		 2932 status->rx_flags = 0;
2933
6368e4b1
RR		 2934 /*
2935 * key references and virtual interfaces are protected using RCU
2936 * and this requires that we are in a read-side RCU section during
2937 * receive processing
2938 */
2939 rcu_read_lock();
2940
2941 /*
2942 * Frames with failed FCS/PLCP checksum are not returned,
2943 * all other frames are returned without radiotap header
2944 * if it was previously present.
2945 * Also, frames with less than 16 bytes are dropped.
2946 */
f1d58c25 2947 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2948 if (!skb) {
2949 rcu_read_unlock();
2950 return;
2951 }
2952
e1e54068
JB		 2953 ieee80211_tpt_led_trig_rx(local,
2954 ((struct ieee80211_hdr *)skb->data)->frame_control,
2955 skb->len);
071d9ac2 2956 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2957
2958 rcu_read_unlock();
77a980dc
JB		 2959
2960 return;
2961 drop:
2962 kfree_skb(skb);
6368e4b1 2963}
103bf9f7 2964EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2965
2966/* This is a version of the rx handler that can be called from hard irq
2967 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2968void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2969{
2970 struct ieee80211_local *local = hw_to_local(hw);
2971
2972 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2973
571ecf67
JB		 2974 skb->pkt_type = IEEE80211_RX_MSG;
2975 skb_queue_tail(&local->skb_queue, skb);
2976 tasklet_schedule(&local->tasklet);
2977}
2978EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)