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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
80 if (status->flag & RX_FLAG_TSFT)
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 */
126 if (status->flag & RX_FLAG_TSFT) {
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 /*
145 * TODO: add following information into radiotap header once
146 * suitable fields are defined for it:
147 * - MCS index (status->rate_idx)
148 * - HT40 (status->flag & RX_FLAG_40MHZ)
149 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 */
151 *pos = 0;
8d6f658e 152 } else {
ebe6c7ba 153 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 154 *pos = rate->bitrate / 5;
8d6f658e 155 }
601ae7f2
BR		 156 pos++;
157
158 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 159 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 160 pos += 2;
161 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 162 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
163 pos);
5f0b7de5
JB		 164 else if (status->flag & RX_FLAG_HT)
165 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
166 pos);
9deb1ae5 167 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2 170 else
6a86b9c7
JB		 171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 pos);
601ae7f2
BR		 173 pos += 2;
174
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
178 rthdr->it_present |=
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 pos++;
181 }
182
601ae7f2
BR		 183 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
184
185 /* IEEE80211_RADIOTAP_ANTENNA */
186 *pos = status->antenna;
187 pos++;
188
601ae7f2
BR		 189 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
190
191 /* IEEE80211_RADIOTAP_RX_FLAGS */
192 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 193 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 194 pos++;
aae89831 195 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 196 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
197 put_unaligned_le16(rx_flags, pos);
601ae7f2 198 pos += 2;
6d744bac
JB		 199
200 if (status->flag & RX_FLAG_HT) {
201 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
202 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
203 IEEE80211_RADIOTAP_MCS_HAVE_GI |
204 IEEE80211_RADIOTAP_MCS_HAVE_BW;
205 *pos = 0;
206 if (status->flag & RX_FLAG_SHORT_GI)
207 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
208 if (status->flag & RX_FLAG_40MHZ)
209 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
210 pos++;
211 *pos++ = status->rate_idx;
212 }
601ae7f2
BR		 213}
214
b2e7771e
JB		 215/*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220static struct sk_buff *
221ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 222 struct ieee80211_rate *rate)
b2e7771e 223{
f1d58c25 224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 225 struct ieee80211_sub_if_data *sdata;
b2e7771e 226 int needed_headroom = 0;
b2e7771e
JB		 227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
b2e7771e
JB		 230
231 /*
232 * First, we may need to make a copy of the skb because
233 * (1) we need to modify it for radiotap (if not present), and
234 * (2) the other RX handlers will modify the skb we got.
235 *
236 * We don't need to, of course, if we aren't going to return
237 * the SKB because it has a bad FCS/PLCP checksum.
238 */
0869aea0
JB		 239
240 /* room for the radiotap header based on driver features */
241 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 242
243 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
244 present_fcs_len = FCS_LEN;
245
e3cf8b3f
ZY		 246 /* make sure hdr->frame_control is on the linear part */
247 if (!pskb_may_pull(origskb, 2)) {
248 dev_kfree_skb(origskb);
249 return NULL;
250 }
251
b2e7771e 252 if (!local->monitors) {
0869aea0 253 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 254 dev_kfree_skb(origskb);
255 return NULL;
256 }
257
0869aea0 258 return remove_monitor_info(local, origskb);
b2e7771e
JB		 259 }
260
0869aea0 261 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 262 /* only need to expand headroom if necessary */
263 skb = origskb;
264 origskb = NULL;
265
266 /*
267 * This shouldn't trigger often because most devices have an
268 * RX header they pull before we get here, and that should
269 * be big enough for our radiotap information. We should
270 * probably export the length to drivers so that we can have
271 * them allocate enough headroom to start with.
272 */
273 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 274 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 275 dev_kfree_skb(skb);
276 return NULL;
277 }
278 } else {
279 /*
280 * Need to make a copy and possibly remove radiotap header
281 * and FCS from the original.
282 */
283 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
284
0869aea0 285 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 286
287 if (!skb)
288 return origskb;
289 }
290
0869aea0
JB		 291 /* prepend radiotap information */
292 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 293
ce3edf6d 294 skb_reset_mac_header(skb);
b2e7771e
JB		 295 skb->ip_summed = CHECKSUM_UNNECESSARY;
296 skb->pkt_type = PACKET_OTHERHOST;
297 skb->protocol = htons(ETH_P_802_2);
298
299 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 300 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 301 continue;
302
3d30d949
MW		 303 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
304 continue;
305
9607e6b6 306 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 307 continue;
308
b2e7771e
JB		 309 if (prev_dev) {
310 skb2 = skb_clone(skb, GFP_ATOMIC);
311 if (skb2) {
312 skb2->dev = prev_dev;
5548a8a1 313 netif_receive_skb(skb2);
b2e7771e
JB		 314 }
315 }
316
317 prev_dev = sdata->dev;
318 sdata->dev->stats.rx_packets++;
319 sdata->dev->stats.rx_bytes += skb->len;
320 }
321
322 if (prev_dev) {
323 skb->dev = prev_dev;
5548a8a1 324 netif_receive_skb(skb);
b2e7771e
JB		 325 } else
326 dev_kfree_skb(skb);
327
328 return origskb;
329}
330
331
5cf121c3 332static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 333{
238f74a2 334 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 335 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 336 int tid;
337
338 /* does the frame have a qos control field? */
238f74a2
HH		 339 if (ieee80211_is_data_qos(hdr->frame_control)) {
340 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 341 /* frame has qos control */
238f74a2
HH		 342 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
343 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 344 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 345 } else {
1411f9b5
JB		 346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 358 }
52865dfd 359
5cf121c3 360 rx->queue = tid;
6e0d114d
JB		 361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 364}
6e0d114d 365
d1c3a37c
JB		 366/**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 377 * in front of it). If the payload data is not properly aligned and the
378 * architecture doesn't support efficient unaligned operations, mac80211
379 * will align the data.
d1c3a37c
JB		 380 *
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
386 *
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
390 */
391static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 392{
59d9cb07
KV		 393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394 WARN_ONCE((unsigned long)rx->skb->data & 1,
395 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 396#endif
6e0d114d
JB		 397}
398
6368e4b1 399
571ecf67
JB		 400/* rx handlers */
401
49461622 402static ieee80211_rx_result debug_noinline
5cf121c3 403ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 404{
405 struct ieee80211_local *local = rx->local;
554891e6 406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 407 struct sk_buff *skb = rx->skb;
408
554891e6 409 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 410 return RX_CONTINUE;
411
412 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
f1d58c25 413 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 414
4080c7cd 415 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
ece8eddd 416 /* drop all the other packets during a software scan anyway */
f1d58c25 417 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 418 dev_kfree_skb(skb);
9ae54c84 419 return RX_QUEUED;
571ecf67
JB		 420 }
421
4080c7cd
JB		 422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
424 return RX_DROP_UNUSABLE;
571ecf67
JB		 425}
426
3cfcf6ac
JM		 427
428static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
429{
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
431
432 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
433 return 0;
434
435 return ieee80211_is_robust_mgmt_frame(hdr);
436}
437
438
439static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
440{
441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
442
443 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
444 return 0;
445
446 return ieee80211_is_robust_mgmt_frame(hdr);
447}
448
449
450/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
451static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
452{
453 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
454 struct ieee80211_mmie *mmie;
455
456 if (skb->len < 24 + sizeof(*mmie) ||
457 !is_multicast_ether_addr(hdr->da))
458 return -1;
459
460 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
461 return -1; /* not a robust management frame */
462
463 mmie = (struct ieee80211_mmie *)
464 (skb->data + skb->len - sizeof(*mmie));
465 if (mmie->element_id != WLAN_EID_MMIE ||
466 mmie->length != sizeof(*mmie) - 2)
467 return -1;
468
469 return le16_to_cpu(mmie->key_id);
470}
471
472
33b64eb2 473static ieee80211_rx_result
5cf121c3 474ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 475{
a7767f95
HH		 476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
477 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 478 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 479
a7767f95 480 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 481 if (is_multicast_ether_addr(hdr->addr1)) {
482 if (ieee80211_has_tods(hdr->frame_control) ||
483 !ieee80211_has_fromds(hdr->frame_control))
484 return RX_DROP_MONITOR;
485 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
486 return RX_DROP_MONITOR;
487 } else {
488 if (!ieee80211_has_a4(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
492 }
33b64eb2
LCC		 493 }
494
495 /* If there is not an established peer link and this is not a peer link
496 * establisment frame, beacon or probe, drop the frame.
497 */
498
b4e08ea1 499 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 500 struct ieee80211_mgmt *mgmt;
d6d1a5a7 501
a7767f95 502 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 503 return RX_DROP_MONITOR;
504
a7767f95 505 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 506 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 507 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 508 return RX_DROP_MONITOR;
33b64eb2 509 return RX_CONTINUE;
33b64eb2
LCC		 510 }
511
a7767f95
HH		 512 if (ieee80211_is_probe_req(hdr->frame_control) ||
513 ieee80211_is_probe_resp(hdr->frame_control) ||
514 ieee80211_is_beacon(hdr->frame_control))
515 return RX_CONTINUE;
516
517 return RX_DROP_MONITOR;
518
519 }
520
521#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
522
523 if (ieee80211_is_data(hdr->frame_control) &&
524 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 525 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 526 return RX_DROP_MONITOR;
902acc78 527#undef msh_h_get
d6d1a5a7 528
902acc78
JB		 529 return RX_CONTINUE;
530}
33b64eb2 531
1edfb1af
JB		 532#define SEQ_MODULO 0x1000
533#define SEQ_MASK 0xfff
534
535static inline int seq_less(u16 sq1, u16 sq2)
536{
537 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
538}
539
540static inline u16 seq_inc(u16 sq)
541{
542 return (sq + 1) & SEQ_MASK;
543}
544
545static inline u16 seq_sub(u16 sq1, u16 sq2)
546{
547 return (sq1 - sq2) & SEQ_MASK;
548}
549
550
551static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
552 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 553 int index)
1edfb1af 554{
24a8fdad 555 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 556 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 557 struct ieee80211_rx_status *status;
1edfb1af 558
dd318575
JB		 559 lockdep_assert_held(&tid_agg_rx->reorder_lock);
560
1edfb1af
JB		 561 if (!skb)
562 goto no_frame;
563
071d9ac2 564 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 565 tid_agg_rx->stored_mpdu_num--;
566 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 567 status = IEEE80211_SKB_RXCB(skb);
568 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 569 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 570
571no_frame:
572 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
573}
574
575static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
576 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 577 u16 head_seq_num)
1edfb1af
JB		 578{
579 int index;
580
dd318575
JB		 581 lockdep_assert_held(&tid_agg_rx->reorder_lock);
582
1edfb1af
JB		 583 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
584 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
585 tid_agg_rx->buf_size;
24a8fdad 586 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 587 }
588}
589
590/*
591 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
592 * the skb was added to the buffer longer than this time ago, the earlier
593 * frames that have not yet been received are assumed to be lost and the skb
594 * can be released for processing. This may also release other skb's from the
595 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 596 *
597 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 598 */
599#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
600
aa0c8636 601static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 602 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 603{
2bff8ebf 604 int index, j;
aa0c8636 605
dd318575
JB		 606 lockdep_assert_held(&tid_agg_rx->reorder_lock);
607
aa0c8636
CL		 608 /* release the buffer until next missing frame */
609 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
610 tid_agg_rx->buf_size;
611 if (!tid_agg_rx->reorder_buf[index] &&
612 tid_agg_rx->stored_mpdu_num > 1) {
613 /*
614 * No buffers ready to be released, but check whether any
615 * frames in the reorder buffer have timed out.
616 */
aa0c8636
CL		 617 int skipped = 1;
618 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
619 j = (j + 1) % tid_agg_rx->buf_size) {
620 if (!tid_agg_rx->reorder_buf[j]) {
621 skipped++;
622 continue;
623 }
624 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
625 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 626 goto set_release_timer;
aa0c8636
CL		 627
628#ifdef CONFIG_MAC80211_HT_DEBUG
629 if (net_ratelimit())
0fb9a9ec
JP		 630 wiphy_debug(hw->wiphy,
631 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 632#endif
24a8fdad 633 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 634
635 /*
636 * Increment the head seq# also for the skipped slots.
637 */
638 tid_agg_rx->head_seq_num =
639 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
640 skipped = 0;
641 }
642 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 643 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 644 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
645 tid_agg_rx->buf_size;
646 }
2bff8ebf
CL		 647
648 if (tid_agg_rx->stored_mpdu_num) {
649 j = index = seq_sub(tid_agg_rx->head_seq_num,
650 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
651
652 for (; j != (index - 1) % tid_agg_rx->buf_size;
653 j = (j + 1) % tid_agg_rx->buf_size) {
654 if (tid_agg_rx->reorder_buf[j])
655 break;
656 }
657
658 set_release_timer:
659
660 mod_timer(&tid_agg_rx->reorder_timer,
661 tid_agg_rx->reorder_time[j] +
662 HT_RX_REORDER_BUF_TIMEOUT);
663 } else {
664 del_timer(&tid_agg_rx->reorder_timer);
665 }
aa0c8636
CL		 666}
667
1edfb1af
JB		 668/*
669 * As this function belongs to the RX path it must be under
670 * rcu_read_lock protection. It returns false if the frame
671 * can be processed immediately, true if it was consumed.
672 */
673static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
674 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 675 struct sk_buff *skb)
1edfb1af
JB		 676{
677 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
678 u16 sc = le16_to_cpu(hdr->seq_ctrl);
679 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
680 u16 head_seq_num, buf_size;
681 int index;
2bff8ebf 682 bool ret = true;
1edfb1af 683
dd318575
JB		 684 spin_lock(&tid_agg_rx->reorder_lock);
685
1edfb1af
JB		 686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
688
689 /* frame with out of date sequence number */
690 if (seq_less(mpdu_seq_num, head_seq_num)) {
691 dev_kfree_skb(skb);
2bff8ebf 692 goto out;
1edfb1af
JB		 693 }
694
695 /*
696 * If frame the sequence number exceeds our buffering window
697 * size release some previous frames to make room for this one.
698 */
699 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
700 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
701 /* release stored frames up to new head to stack */
24a8fdad 702 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 703 }
704
705 /* Now the new frame is always in the range of the reordering buffer */
706
707 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
708
709 /* check if we already stored this frame */
710 if (tid_agg_rx->reorder_buf[index]) {
711 dev_kfree_skb(skb);
2bff8ebf 712 goto out;
1edfb1af
JB		 713 }
714
715 /*
716 * If the current MPDU is in the right order and nothing else
717 * is stored we can process it directly, no need to buffer it.
718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 722 ret = false;
723 goto out;
1edfb1af
JB		 724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
24a8fdad 730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 731
2bff8ebf
CL		 732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
1edfb1af
JB		 735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
24a8fdad 741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 742{
2569a826
JB		 743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 747 struct sta_info *sta = rx->sta;
1edfb1af
JB		 748 struct tid_ampdu_rx *tid_agg_rx;
749 u16 sc;
750 int tid;
751
752 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 753 goto dont_reorder;
1edfb1af
JB		 754
755 /*
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
758 */
759
1edfb1af 760 if (!sta)
2569a826 761 goto dont_reorder;
1edfb1af
JB		 762
763 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
764
a87f736d
JB		 765 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
766 if (!tid_agg_rx)
767 goto dont_reorder;
1edfb1af
JB		 768
769 /* qos null data frames are excluded */
770 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 771 goto dont_reorder;
1edfb1af
JB		 772
773 /* new, potentially un-ordered, ampdu frame - process it */
774
775 /* reset session timer */
776 if (tid_agg_rx->timeout)
777 mod_timer(&tid_agg_rx->session_timer,
778 TU_TO_EXP_TIME(tid_agg_rx->timeout));
779
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc = le16_to_cpu(hdr->seq_ctrl);
782 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 783 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 784 skb_queue_tail(&rx->sdata->skb_queue, skb);
785 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 786 return;
1edfb1af
JB		 787 }
788
a87f736d
JB		 789 /*
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
794 * anything with it.
795 */
24a8fdad 796 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 797 return;
798
799 dont_reorder:
24a8fdad 800 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 801}
33b64eb2 802
49461622 803static ieee80211_rx_result debug_noinline
5cf121c3 804ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 805{
a7767f95 806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 808
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 811 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 812 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 813 hdr->seq_ctrl)) {
554891e6 814 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 815 rx->local->dot11FrameDuplicateCount++;
816 rx->sta->num_duplicates++;
817 }
e4c26add 818 return RX_DROP_MONITOR;
571ecf67 819 } else
5cf121c3 820 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 821 }
822
571ecf67
JB		 823 if (unlikely(rx->skb->len < 16)) {
824 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 825 return RX_DROP_MONITOR;
571ecf67
JB		 826 }
827
571ecf67
JB		 828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
830 *
ccd7b362
JB		 831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
835 */
33b64eb2 836
902acc78 837 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 838 return ieee80211_rx_mesh_check(rx);
33b64eb2 839
a7767f95
HH		 840 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 842 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 843 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 844 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 845 if ((!ieee80211_has_fromds(hdr->frame_control) &&
846 !ieee80211_has_tods(hdr->frame_control) &&
847 ieee80211_is_data(hdr->frame_control)) ||
554891e6 848 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 849 /* Drop IBSS frames and frames for other hosts
850 * silently. */
e4c26add 851 return RX_DROP_MONITOR;
571ecf67
JB		 852 }
853
e4c26add 854 return RX_DROP_MONITOR;
571ecf67
JB		 855 }
856
9ae54c84 857 return RX_CONTINUE;
570bd537
JB		 858}
859
860
49461622 861static ieee80211_rx_result debug_noinline
5cf121c3 862ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 863{
eb9fb5b8
JB		 864 struct sk_buff *skb = rx->skb;
865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 867 int keyidx;
868 int hdrlen;
e4c26add 869 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 870 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 871 int mmie_keyidx = -1;
761ab470 872 __le16 fc;
570bd537 873
3017b80b
JB		 874 /*
875 * Key selection 101
876 *
3cfcf6ac 877 * There are four types of keys:
3017b80b 878 * - GTK (group keys)
3cfcf6ac 879 * - IGTK (group keys for management frames)
3017b80b
JB		 880 * - PTK (pairwise keys)
881 * - STK (station-to-station pairwise keys)
882 *
883 * When selecting a key, we have to distinguish between multicast
884 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 885 * use PTKs and STKs while the former always use GTKs and IGTKs.
886 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
887 * unicast frames can also use key indices like GTKs. Hence, if we
888 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 889 *
8dc06a1c
JB		 890 * Note that in a regular BSS, multicast frames are sent by the
891 * AP only, associated stations unicast the frame to the AP first
892 * which then multicasts it on their behalf.
893 *
3017b80b
JB		 894 * There is also a slight problem in IBSS mode: GTKs are negotiated
895 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 896 * The spec seems to expect that one negotiates the same key with
897 * every station but there's no such requirement; VLANs could be
898 * possible.
3017b80b
JB		 899 */
900
3017b80b 901 /*
1990af8d 902 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 903 * addressed to us nor a multicast frame.
904 */
554891e6 905 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 906 return RX_CONTINUE;
3017b80b 907
2569a826
JB		 908 /* start without a key */
909 rx->key = NULL;
910
d4e46a3d 911 if (rx->sta)
e31b8213 912 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 913
761ab470
JB		 914 fc = hdr->frame_control;
915
916 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 917 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
918
e31b8213
JB		 919 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
920 rx->key = sta_ptk;
dc1580dd
JB		 921 if ((status->flag & RX_FLAG_DECRYPTED) &&
922 (status->flag & RX_FLAG_IV_STRIPPED))
923 return RX_CONTINUE;
0c7c10c7 924 /* Skip decryption if the frame is not protected. */
761ab470 925 if (!ieee80211_has_protected(fc))
0c7c10c7 926 return RX_CONTINUE;
3cfcf6ac
JM		 927 } else if (mmie_keyidx >= 0) {
928 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 929 if ((status->flag & RX_FLAG_DECRYPTED) &&
930 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 931 return RX_CONTINUE;
932
933 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
934 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
935 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 936 if (rx->sta)
937 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
938 if (!rx->key)
939 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 940 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 941 /*
942 * The frame was not protected, so skip decryption. However, we
943 * need to set rx->key if there is a key that could have been
944 * used so that the frame may be dropped if encryption would
945 * have been expected.
946 */
947 struct ieee80211_key *key = NULL;
897bed8b
JB		 948 struct ieee80211_sub_if_data *sdata = rx->sdata;
949 int i;
950
761ab470 951 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
954 rx->key = key;
897bed8b
JB		 955 else {
956 if (rx->sta) {
957 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
958 key = rcu_dereference(rx->sta->gtk[i]);
959 if (key)
960 break;
961 }
962 }
963 if (!key) {
964 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
965 key = rcu_dereference(sdata->keys[i]);
966 if (key)
967 break;
968 }
969 }
970 if (key)
971 rx->key = key;
972 }
0c7c10c7 973 return RX_CONTINUE;
571ecf67 974 } else {
39184b15 975 u8 keyid;
3017b80b
JB		 976 /*
977 * The device doesn't give us the IV so we won't be
978 * able to look up the key. That's ok though, we
979 * don't need to decrypt the frame, we just won't
980 * be able to keep statistics accurate.
981 * Except for key threshold notifications, should
982 * we somehow allow the driver to tell us which key
983 * the hardware used if this flag is set?
984 */
eb9fb5b8
JB		 985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 987 return RX_CONTINUE;
3017b80b 988
761ab470 989 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 990
991 if (rx->skb->len < 8 + hdrlen)
e4c26add 992 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 993
994 /*
995 * no need to call ieee80211_wep_get_keyidx,
996 * it verifies a bunch of things we've done already
997 */
39184b15
ZY		 998 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
999 keyidx = keyid >> 6;
3017b80b 1000
e31b8213
JB		 1001 /* check per-station GTK first, if multicast packet */
1002 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1003 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1004
e31b8213
JB		 1005 /* if not found, try default key */
1006 if (!rx->key) {
1007 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1008
1009 /*
1010 * RSNA-protected unicast frames should always be
1011 * sent with pairwise or station-to-station keys,
1012 * but for WEP we allow using a key index as well.
1013 */
1014 if (rx->key &&
1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1016 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1017 !is_multicast_ether_addr(hdr->addr1))
1018 rx->key = NULL;
1019 }
571ecf67
JB		 1020 }
1021
3017b80b 1022 if (rx->key) {
571ecf67 1023 rx->key->tx_rx_count++;
011bfcc4 1024 /* TODO: add threshold stuff again */
1990af8d 1025 } else {
e4c26add 1026 return RX_DROP_MONITOR;
70f08765
JB		 1027 }
1028
39184b15
ZY		 1029 if (skb_linearize(rx->skb))
1030 return RX_DROP_UNUSABLE;
761ab470 1031 /* the hdr variable is invalid now! */
1990af8d 1032
97359d12
JB		 1033 switch (rx->key->conf.cipher) {
1034 case WLAN_CIPHER_SUITE_WEP40:
1035 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1036 /* Check for weak IVs if possible */
1037 if (rx->sta && ieee80211_is_data(fc) &&
1038 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1039 !(status->flag & RX_FLAG_DECRYPTED)) &&
1040 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1041 rx->sta->wep_weak_iv_count++;
1042
e2f036da
MN		 1043 result = ieee80211_crypto_wep_decrypt(rx);
1044 break;
97359d12 1045 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1046 result = ieee80211_crypto_tkip_decrypt(rx);
1047 break;
97359d12 1048 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1049 result = ieee80211_crypto_ccmp_decrypt(rx);
1050 break;
97359d12 1051 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1052 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1053 break;
3ffc2a90
JB		 1054 default:
1055 /*
1056 * We can reach here only with HW-only algorithms
1057 * but why didn't it decrypt the frame?!
1058 */
1059 return RX_DROP_UNUSABLE;
70f08765
JB		 1060 }
1061
e2f036da 1062 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1063 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1064
1065 return result;
70f08765
JB		 1066}
1067
572e0012
KV		 1068static ieee80211_rx_result debug_noinline
1069ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1070{
1071 struct ieee80211_local *local;
1072 struct ieee80211_hdr *hdr;
1073 struct sk_buff *skb;
1074
1075 local = rx->local;
1076 skb = rx->skb;
1077 hdr = (struct ieee80211_hdr *) skb->data;
1078
1079 if (!local->pspolling)
1080 return RX_CONTINUE;
1081
1082 if (!ieee80211_has_fromds(hdr->frame_control))
1083 /* this is not from AP */
1084 return RX_CONTINUE;
1085
1086 if (!ieee80211_is_data(hdr->frame_control))
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_has_moredata(hdr->frame_control)) {
1090 /* AP has no more frames buffered for us */
1091 local->pspolling = false;
1092 return RX_CONTINUE;
1093 }
1094
1095 /* more data bit is set, let's request a new frame from the AP */
1096 ieee80211_send_pspoll(local, rx->sdata);
1097
1098 return RX_CONTINUE;
1099}
1100
133b8226 1101static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1102{
133b8226 1103 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1104 struct ieee80211_local *local = sdata->local;
0795af57 1105
3e122be0 1106 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1107 set_sta_flags(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1108 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1109 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1110#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1111 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1112 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1113#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1114}
1115
ff9458d3 1116static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1117{
133b8226 1118 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1119
3e122be0 1120 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1121
571ecf67 1122#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1123 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1124 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1125#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1126
af818581 1127 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1129 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1130 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1131#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1132 return;
1133 }
1134
1135 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1136}
1137
d057e5a3
AN		 1138int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1139{
1140 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1141 bool in_ps;
1142
1143 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1144
1145 /* Don't let the same PS state be set twice */
1146 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA);
1147 if ((start && in_ps) || (!start && !in_ps))
1148 return -EINVAL;
1149
1150 if (start)
1151 ap_sta_ps_start(sta_inf);
1152 else
1153 ap_sta_ps_end(sta_inf);
1154
1155 return 0;
1156}
1157EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1158
49461622 1159static ieee80211_rx_result debug_noinline
5cf121c3 1160ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1161{
1162 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1163 struct sk_buff *skb = rx->skb;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1166
1167 if (!sta)
9ae54c84 1168 return RX_CONTINUE;
571ecf67 1169
b291ba11
JB		 1170 /*
1171 * Update last_rx only for IBSS packets which are for the current
1172 * BSSID to avoid keeping the current IBSS network alive in cases
1173 * where other STAs start using different BSSID.
1174 */
05c914fe 1175 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1176 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1177 NL80211_IFTYPE_ADHOC);
46900298 1178 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1179 sta->last_rx = jiffies;
b291ba11
JB		 1180 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1181 /*
33b64eb2
LCC		 1182 * Mesh beacons will update last_rx when if they are found to
1183 * match the current local configuration when processed.
571ecf67 1184 */
b291ba11 1185 sta->last_rx = jiffies;
571ecf67
JB		 1186 }
1187
554891e6 1188 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1189 return RX_CONTINUE;
571ecf67 1190
3cf335d5
KV		 1191 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1192 ieee80211_sta_rx_notify(rx->sdata, hdr);
1193
571ecf67
JB		 1194 sta->rx_fragments++;
1195 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1196 sta->last_signal = status->signal;
541a45a1 1197 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1198
72eaa43a
JB		 1199 /*
1200 * Change STA power saving mode only at the end of a frame
1201 * exchange sequence.
1202 */
d057e5a3
AN		 1203 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1204 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1205 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1206 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1207 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1208 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1209 /*
1210 * Ignore doze->wake transitions that are
1211 * indicated by non-data frames, the standard
1212 * is unclear here, but for example going to
1213 * PS mode and then scanning would cause a
1214 * doze->wake transition for the probe request,
1215 * and that is clearly undesirable.
1216 */
1217 if (ieee80211_is_data(hdr->frame_control) &&
1218 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1219 ap_sta_ps_end(sta);
72eaa43a
JB		 1220 } else {
1221 if (ieee80211_has_pm(hdr->frame_control))
1222 ap_sta_ps_start(sta);
1223 }
571ecf67
JB		 1224 }
1225
22403def
JB		 1226 /*
1227 * Drop (qos-)data::nullfunc frames silently, since they
1228 * are used only to control station power saving mode.
1229 */
1230 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1231 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1232 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1233
1234 /*
1235 * If we receive a 4-addr nullfunc frame from a STA
1236 * that was not moved to a 4-addr STA vlan yet, drop
1237 * the frame to the monitor interface, to make sure
1238 * that hostapd sees it
1239 */
1240 if (ieee80211_has_a4(hdr->frame_control) &&
1241 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1242 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1243 !rx->sdata->u.vlan.sta)))
1244 return RX_DROP_MONITOR;
22403def
JB		 1245 /*
1246 * Update counter and free packet here to avoid
1247 * counting this as a dropped packed.
1248 */
571ecf67
JB		 1249 sta->rx_packets++;
1250 dev_kfree_skb(rx->skb);
9ae54c84 1251 return RX_QUEUED;
571ecf67
JB		 1252 }
1253
9ae54c84 1254 return RX_CONTINUE;
571ecf67
JB		 1255} /* ieee80211_rx_h_sta_process */
1256
571ecf67
JB		 1257static inline struct ieee80211_fragment_entry *
1258ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1259 unsigned int frag, unsigned int seq, int rx_queue,
1260 struct sk_buff **skb)
1261{
1262 struct ieee80211_fragment_entry *entry;
1263 int idx;
1264
1265 idx = sdata->fragment_next;
1266 entry = &sdata->fragments[sdata->fragment_next++];
1267 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1268 sdata->fragment_next = 0;
1269
1270 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1271#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1272 struct ieee80211_hdr *hdr =
1273 (struct ieee80211_hdr *) entry->skb_list.next->data;
1274 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1275 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1276 "addr1=%pM addr2=%pM\n",
47846c9b 1277 sdata->name, idx,
571ecf67 1278 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1279 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1280#endif
571ecf67
JB		 1281 __skb_queue_purge(&entry->skb_list);
1282 }
1283
1284 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1285 *skb = NULL;
1286 entry->first_frag_time = jiffies;
1287 entry->seq = seq;
1288 entry->rx_queue = rx_queue;
1289 entry->last_frag = frag;
1290 entry->ccmp = 0;
1291 entry->extra_len = 0;
1292
1293 return entry;
1294}
1295
1296static inline struct ieee80211_fragment_entry *
1297ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1298 unsigned int frag, unsigned int seq,
571ecf67
JB		 1299 int rx_queue, struct ieee80211_hdr *hdr)
1300{
1301 struct ieee80211_fragment_entry *entry;
1302 int i, idx;
1303
1304 idx = sdata->fragment_next;
1305 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1306 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1307
1308 idx--;
1309 if (idx < 0)
1310 idx = IEEE80211_FRAGMENT_MAX - 1;
1311
1312 entry = &sdata->fragments[idx];
1313 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1314 entry->rx_queue != rx_queue ||
1315 entry->last_frag + 1 != frag)
1316 continue;
1317
b73d70ad 1318 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1319
b73d70ad
HH		 1320 /*
1321 * Check ftype and addresses are equal, else check next fragment
1322 */
1323 if (((hdr->frame_control ^ f_hdr->frame_control) &
1324 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1325 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1326 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1327 continue;
1328
ab46623e 1329 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1330 __skb_queue_purge(&entry->skb_list);
1331 continue;
1332 }
1333 return entry;
1334 }
1335
1336 return NULL;
1337}
1338
49461622 1339static ieee80211_rx_result debug_noinline
5cf121c3 1340ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1341{
1342 struct ieee80211_hdr *hdr;
1343 u16 sc;
358c8d9d 1344 __le16 fc;
571ecf67
JB		 1345 unsigned int frag, seq;
1346 struct ieee80211_fragment_entry *entry;
1347 struct sk_buff *skb;
554891e6 1348 struct ieee80211_rx_status *status;
571ecf67 1349
b73d70ad 1350 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1351 fc = hdr->frame_control;
571ecf67
JB		 1352 sc = le16_to_cpu(hdr->seq_ctrl);
1353 frag = sc & IEEE80211_SCTL_FRAG;
1354
358c8d9d 1355 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1356 (rx->skb)->len < 24 ||
1357 is_multicast_ether_addr(hdr->addr1))) {
1358 /* not fragmented */
1359 goto out;
1360 }
1361 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1362
e3cf8b3f
ZY		 1363 if (skb_linearize(rx->skb))
1364 return RX_DROP_UNUSABLE;
1365
058897a4
AK		 1366 /*
1367 * skb_linearize() might change the skb->data and
1368 * previously cached variables (in this case, hdr) need to
1369 * be refreshed with the new data.
1370 */
1371 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1372 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1373
1374 if (frag == 0) {
1375 /* This is the first fragment of a new frame. */
1376 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1377 rx->queue, &(rx->skb));
97359d12 1378 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1379 ieee80211_has_protected(fc)) {
9190252c
JM		 1380 int queue = ieee80211_is_mgmt(fc) ?
1381 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1382 /* Store CCMP PN so that we can verify that the next
1383 * fragment has a sequential PN value. */
1384 entry->ccmp = 1;
1385 memcpy(entry->last_pn,
9190252c 1386 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1387 CCMP_PN_LEN);
1388 }
9ae54c84 1389 return RX_QUEUED;
571ecf67
JB		 1390 }
1391
1392 /* This is a fragment for a frame that should already be pending in
1393 * fragment cache. Add this fragment to the end of the pending entry.
1394 */
b73d70ad 1395 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1396 if (!entry) {
1397 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1398 return RX_DROP_MONITOR;
571ecf67
JB		 1399 }
1400
1401 /* Verify that MPDUs within one MSDU have sequential PN values.
1402 * (IEEE 802.11i, 8.3.3.4.5) */
1403 if (entry->ccmp) {
1404 int i;
1405 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1406 int queue;
97359d12 1407 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1408 return RX_DROP_UNUSABLE;
571ecf67
JB		 1409 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1410 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1411 pn[i]++;
1412 if (pn[i])
1413 break;
1414 }
9190252c
JM		 1415 queue = ieee80211_is_mgmt(fc) ?
1416 NUM_RX_DATA_QUEUES : rx->queue;
1417 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1418 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1419 return RX_DROP_UNUSABLE;
571ecf67
JB		 1420 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1421 }
1422
358c8d9d 1423 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1424 __skb_queue_tail(&entry->skb_list, rx->skb);
1425 entry->last_frag = frag;
1426 entry->extra_len += rx->skb->len;
358c8d9d 1427 if (ieee80211_has_morefrags(fc)) {
571ecf67 1428 rx->skb = NULL;
9ae54c84 1429 return RX_QUEUED;
571ecf67
JB		 1430 }
1431
1432 rx->skb = __skb_dequeue(&entry->skb_list);
1433 if (skb_tailroom(rx->skb) < entry->extra_len) {
1434 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1435 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1436 GFP_ATOMIC))) {
1437 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1438 __skb_queue_purge(&entry->skb_list);
e4c26add 1439 return RX_DROP_UNUSABLE;
571ecf67
JB		 1440 }
1441 }
1442 while ((skb = __skb_dequeue(&entry->skb_list))) {
1443 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1444 dev_kfree_skb(skb);
1445 }
1446
1447 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1448 status = IEEE80211_SKB_RXCB(rx->skb);
1449 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1450
1451 out:
1452 if (rx->sta)
1453 rx->sta->rx_packets++;
1454 if (is_multicast_ether_addr(hdr->addr1))
1455 rx->local->dot11MulticastReceivedFrameCount++;
1456 else
1457 ieee80211_led_rx(rx->local);
9ae54c84 1458 return RX_CONTINUE;
571ecf67
JB		 1459}
1460
49461622 1461static ieee80211_rx_result debug_noinline
5cf121c3 1462ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1463{
af818581 1464 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1465 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1466 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1467
358c8d9d 1468 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1469 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1470 return RX_CONTINUE;
571ecf67 1471
05c914fe
JB		 1472 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1473 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1474 return RX_DROP_UNUSABLE;
98f0b0a3 1475
af818581
JB		 1476 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1477 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1478 else
1479 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1480
9ae54c84 1481 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1482 * count as an dropped frame. */
1483 dev_kfree_skb(rx->skb);
1484
9ae54c84 1485 return RX_QUEUED;
571ecf67
JB		 1486}
1487
49461622 1488static ieee80211_rx_result debug_noinline
5cf121c3 1489ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1490{
6e0d114d 1491 u8 *data = rx->skb->data;
238f74a2 1492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1493
238f74a2 1494 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1495 return RX_CONTINUE;
6e0d114d
JB		 1496
1497 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1498 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1499 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1500 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1501 /* change frame type to non QOS */
238f74a2 1502 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1503
9ae54c84 1504 return RX_CONTINUE;
6e0d114d
JB		 1505}
1506
76ee65bf 1507static int
5cf121c3 1508ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1509{
07346f81 1510 if (unlikely(!rx->sta ||
f4ea83dd 1511 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1512 return -EACCES;
571ecf67 1513
76ee65bf 1514 return 0;
571ecf67
JB		 1515}
1516
76ee65bf 1517static int
358c8d9d 1518ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1519{
eb9fb5b8
JB		 1520 struct sk_buff *skb = rx->skb;
1521 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1522
3017b80b 1523 /*
7848ba7d
JB		 1524 * Pass through unencrypted frames if the hardware has
1525 * decrypted them already.
3017b80b 1526 */
eb9fb5b8 1527 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1528 return 0;
571ecf67
JB		 1529
1530 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1531 if (unlikely(!ieee80211_has_protected(fc) &&
1532 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1533 ieee80211_is_data(fc) &&
b3fc9c6c 1534 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1535 return -EACCES;
bef5d1c7
JB		 1536
1537 return 0;
1538}
1539
1540static int
1541ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1542{
1543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1545 __le16 fc = hdr->frame_control;
bef5d1c7 1546
e3efca0a
JM		 1547 /*
1548 * Pass through unencrypted frames if the hardware has
1549 * decrypted them already.
1550 */
1551 if (status->flag & RX_FLAG_DECRYPTED)
1552 return 0;
bef5d1c7 1553
f2ca3ea4 1554 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1555 if (unlikely(!ieee80211_has_protected(fc) &&
1556 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1557 rx->key)) {
1558 if (ieee80211_is_deauth(fc))
1559 cfg80211_send_unprot_deauth(rx->sdata->dev,
1560 rx->skb->data,
1561 rx->skb->len);
1562 else if (ieee80211_is_disassoc(fc))
1563 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1564 rx->skb->data,
1565 rx->skb->len);
f2ca3ea4 1566 return -EACCES;
cf4e594e 1567 }
f2ca3ea4 1568 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1569 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1570 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1571 if (ieee80211_is_deauth(fc))
1572 cfg80211_send_unprot_deauth(rx->sdata->dev,
1573 rx->skb->data,
1574 rx->skb->len);
1575 else if (ieee80211_is_disassoc(fc))
1576 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1577 rx->skb->data,
1578 rx->skb->len);
f2ca3ea4 1579 return -EACCES;
cf4e594e 1580 }
f2ca3ea4
JM		 1581 /*
1582 * When using MFP, Action frames are not allowed prior to
1583 * having configured keys.
1584 */
1585 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1586 ieee80211_is_robust_mgmt_frame(
1587 (struct ieee80211_hdr *) rx->skb->data)))
1588 return -EACCES;
1589 }
b3fc9c6c 1590
76ee65bf 1591 return 0;
571ecf67
JB		 1592}
1593
76ee65bf 1594static int
e31a16d6 1595__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1596{
eb9fb5b8 1597 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1598 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1599 bool check_port_control = false;
1600 struct ethhdr *ehdr;
1601 int ret;
f14543ee 1602
9bc383de
JB		 1603 if (ieee80211_has_a4(hdr->frame_control) &&
1604 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1605 return -1;
9bc383de 1606
fbb327c5
FF		 1607 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1608 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1609
1610 if (!sdata->u.mgd.use_4addr)
1611 return -1;
1612 else
1613 check_port_control = true;
1614 }
1615
9bc383de 1616 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1617 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1618 return -1;
571ecf67 1619
fbb327c5
FF		 1620 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1621 if (ret < 0 || !check_port_control)
1622 return ret;
1623
1624 ehdr = (struct ethhdr *) rx->skb->data;
1625 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1626 return -1;
1627
1628 return 0;
76ee65bf 1629}
571ecf67 1630
ce3edf6d
JB		 1631/*
1632 * requires that rx->skb is a frame with ethernet header
1633 */
358c8d9d 1634static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1635{
c97c23e3 1636 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1637 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1638 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1639
1640 /*
1641 * Allow EAPOL frames to us/the PAE group address regardless
1642 * of whether the frame was encrypted or not.
1643 */
a621fa4d 1644 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1645 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1646 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1647 return true;
1648
1649 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1650 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1651 return false;
1652
1653 return true;
1654}
1655
1656/*
1657 * requires that rx->skb is a frame with ethernet header
1658 */
76ee65bf 1659static void
5cf121c3 1660ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1661{
eb9fb5b8
JB		 1662 struct ieee80211_sub_if_data *sdata = rx->sdata;
1663 struct net_device *dev = sdata->dev;
76ee65bf 1664 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1665 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1666 struct sta_info *dsta;
554891e6 1667 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1668
76ee65bf
RR		 1669 skb = rx->skb;
1670 xmit_skb = NULL;
571ecf67 1671
05c914fe
JB		 1672 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1674 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1675 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1676 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1677 if (is_multicast_ether_addr(ehdr->h_dest)) {
1678 /*
1679 * send multicast frames both to higher layers in
1680 * local net stack and back to the wireless medium
1681 */
76ee65bf
RR		 1682 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1683 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1684 printk(KERN_DEBUG "%s: failed to clone "
1685 "multicast frame\n", dev->name);
1686 } else {
abe60632
JB		 1687 dsta = sta_info_get(sdata, skb->data);
1688 if (dsta) {
ce3edf6d
JB		 1689 /*
1690 * The destination station is associated to
1691 * this AP (in this VLAN), so send the frame
1692 * directly to it and do not pass it to local
1693 * net stack.
571ecf67 1694 */
76ee65bf 1695 xmit_skb = skb;
571ecf67
JB		 1696 skb = NULL;
1697 }
571ecf67
JB		 1698 }
1699 }
1700
1701 if (skb) {
d1c3a37c
JB		 1702 int align __maybe_unused;
1703
59d9cb07 1704#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1705 /*
1706 * 'align' will only take the values 0 or 2 here
1707 * since all frames are required to be aligned
1708 * to 2-byte boundaries when being passed to
1709 * mac80211. That also explains the __skb_push()
1710 * below.
1711 */
dacb6f1d 1712 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1713 if (align) {
1714 if (WARN_ON(skb_headroom(skb) < 3)) {
1715 dev_kfree_skb(skb);
1716 skb = NULL;
1717 } else {
1718 u8 *data = skb->data;
8ce0b589
ZY		 1719 size_t len = skb_headlen(skb);
1720 skb->data -= align;
1721 memmove(skb->data, data, len);
1722 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1723 }
1724 }
1725#endif
1726
1727 if (skb) {
1728 /* deliver to local stack */
1729 skb->protocol = eth_type_trans(skb, dev);
1730 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1731 netif_receive_skb(skb);
d1c3a37c 1732 }
571ecf67
JB		 1733 }
1734
76ee65bf 1735 if (xmit_skb) {
571ecf67 1736 /* send to wireless media */
f831e909 1737 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1738 skb_reset_network_header(xmit_skb);
1739 skb_reset_mac_header(xmit_skb);
76ee65bf 1740 dev_queue_xmit(xmit_skb);
571ecf67 1741 }
76ee65bf
RR		 1742}
1743
49461622 1744static ieee80211_rx_result debug_noinline
5cf121c3 1745ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1746{
eb9fb5b8 1747 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1748 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1750 __le16 fc = hdr->frame_control;
eaf85ca7 1751 struct sk_buff_head frame_list;
554891e6 1752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1753
358c8d9d 1754 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1755 return RX_CONTINUE;
fd4c7f2f 1756
358c8d9d 1757 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1758 return RX_DROP_MONITOR;
fd4c7f2f 1759
554891e6 1760 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1761 return RX_CONTINUE;
fd4c7f2f 1762
eaf85ca7
ZY		 1763 if (ieee80211_has_a4(hdr->frame_control) &&
1764 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1765 !rx->sdata->u.vlan.sta)
e4c26add 1766 return RX_DROP_UNUSABLE;
fd4c7f2f 1767
eaf85ca7
ZY		 1768 if (is_multicast_ether_addr(hdr->addr1) &&
1769 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1770 rx->sdata->u.vlan.sta) ||
1771 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1772 rx->sdata->u.mgd.use_4addr)))
e4c26add 1773 return RX_DROP_UNUSABLE;
fd4c7f2f 1774
eaf85ca7
ZY		 1775 skb->dev = dev;
1776 __skb_queue_head_init(&frame_list);
fd4c7f2f 1777
e3cf8b3f
ZY		 1778 if (skb_linearize(skb))
1779 return RX_DROP_UNUSABLE;
1780
eaf85ca7
ZY		 1781 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1782 rx->sdata->vif.type,
1783 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1784
eaf85ca7
ZY		 1785 while (!skb_queue_empty(&frame_list)) {
1786 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1787
358c8d9d 1788 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1789 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1790 continue;
1791 }
eaf85ca7
ZY		 1792 dev->stats.rx_packets++;
1793 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1794
1795 ieee80211_deliver_skb(rx);
1796 }
1797
9ae54c84 1798 return RX_QUEUED;
fd4c7f2f
RR		 1799}
1800
bf94e17b 1801#ifdef CONFIG_MAC80211_MESH
b0dee578 1802static ieee80211_rx_result
e32f85f7
LCC		 1803ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1804{
1805 struct ieee80211_hdr *hdr;
1806 struct ieee80211s_hdr *mesh_hdr;
1807 unsigned int hdrlen;
1808 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1809 struct ieee80211_local *local = rx->local;
eb9fb5b8 1810 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1811 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1812
1813 hdr = (struct ieee80211_hdr *) skb->data;
1814 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1815 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1816
1817 if (!ieee80211_is_data(hdr->frame_control))
1818 return RX_CONTINUE;
1819
1820 if (!mesh_hdr->ttl)
1821 /* illegal frame */
1822 return RX_DROP_MONITOR;
1823
43b7b314 1824 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1825 struct mesh_path *mppath;
43b7b314
JC		 1826 char *proxied_addr;
1827 char *mpp_addr;
1828
1829 if (is_multicast_ether_addr(hdr->addr1)) {
1830 mpp_addr = hdr->addr3;
1831 proxied_addr = mesh_hdr->eaddr1;
1832 } else {
1833 mpp_addr = hdr->addr4;
1834 proxied_addr = mesh_hdr->eaddr2;
1835 }
79617dee 1836
79617dee 1837 rcu_read_lock();
43b7b314 1838 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1839 if (!mppath) {
43b7b314 1840 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1841 } else {
1842 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1843 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1844 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1845 spin_unlock_bh(&mppath->state_lock);
1846 }
1847 rcu_read_unlock();
1848 }
1849
3c5772a5
JC		 1850 /* Frame has reached destination. Don't forward */
1851 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1852 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1853 return RX_CONTINUE;
1854
1855 mesh_hdr->ttl--;
1856
554891e6 1857 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1858 if (!mesh_hdr->ttl)
472dbc45 1859 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1860 dropped_frames_ttl);
1861 else {
1862 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1863 struct ieee80211_tx_info *info;
1864
e32f85f7
LCC		 1865 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1866
1867 if (!fwd_skb && net_ratelimit())
1868 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1869 sdata->name);
919bbad5 1870 if (!fwd_skb)
b51aff05 1871 goto out;
e32f85f7
LCC		 1872
1873 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1874 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1875 info = IEEE80211_SKB_CB(fwd_skb);
1876 memset(info, 0, sizeof(*info));
1877 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1878 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1879 skb_set_queue_mapping(skb,
1880 ieee80211_select_queue(rx->sdata, fwd_skb));
1881 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1882 if (is_multicast_ether_addr(fwd_hdr->addr1))
1883 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1884 fwded_mcast);
1885 else {
3c5772a5
JC		 1886 int err;
1887 /*
1888 * Save TA to addr1 to send TA a path error if a
1889 * suitable next hop is not found
1890 */
1891 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1892 ETH_ALEN);
3c5772a5 1893 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1894 /* Failed to immediately resolve next hop:
1895 * fwded frame was dropped or will be added
1896 * later to the pending skb queue. */
1897 if (err)
1898 return RX_DROP_MONITOR;
c8a61a7d
DW		 1899
1900 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1901 fwded_unicast);
249b405c
JC		 1902 }
1903 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1904 fwded_frames);
3b8d81e0 1905 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1906 }
1907 }
1908
b51aff05 1909 out:
3c5772a5 1910 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1911 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1912 return RX_CONTINUE;
1913 else
1914 return RX_DROP_MONITOR;
1915}
bf94e17b 1916#endif
e32f85f7 1917
49461622 1918static ieee80211_rx_result debug_noinline
5cf121c3 1919ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1920{
eb9fb5b8 1921 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1922 struct ieee80211_local *local = rx->local;
eb9fb5b8 1923 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1925 __le16 fc = hdr->frame_control;
ce3edf6d 1926 int err;
76ee65bf 1927
358c8d9d 1928 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1929 return RX_CONTINUE;
76ee65bf 1930
358c8d9d 1931 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1932 return RX_DROP_MONITOR;
76ee65bf 1933
f14543ee
FF		 1934 /*
1935 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1936 * that a 4-addr station can be detected and moved into a separate VLAN
1937 */
1938 if (ieee80211_has_a4(hdr->frame_control) &&
1939 sdata->vif.type == NL80211_IFTYPE_AP)
1940 return RX_DROP_MONITOR;
1941
e31a16d6 1942 err = __ieee80211_data_to_8023(rx);
76ee65bf 1943 if (unlikely(err))
e4c26add 1944 return RX_DROP_UNUSABLE;
76ee65bf 1945
358c8d9d 1946 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1947 return RX_DROP_MONITOR;
ce3edf6d 1948
76ee65bf
RR		 1949 rx->skb->dev = dev;
1950
1951 dev->stats.rx_packets++;
1952 dev->stats.rx_bytes += rx->skb->len;
1953
08ca944e
HS		 1954 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1955 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
e15276a4
VN		 1956 mod_timer(&local->dynamic_ps_timer, jiffies +
1957 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1958 }
1959
76ee65bf 1960 ieee80211_deliver_skb(rx);
571ecf67 1961
9ae54c84 1962 return RX_QUEUED;
571ecf67
JB		 1963}
1964
49461622 1965static ieee80211_rx_result debug_noinline
24a8fdad 1966ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1967{
1968 struct ieee80211_local *local = rx->local;
1969 struct ieee80211_hw *hw = &local->hw;
1970 struct sk_buff *skb = rx->skb;
a7767f95 1971 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1972 struct tid_ampdu_rx *tid_agg_rx;
1973 u16 start_seq_num;
1974 u16 tid;
1975
a7767f95 1976 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1977 return RX_CONTINUE;
71364716 1978
a7767f95 1979 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1980 struct {
1981 __le16 control, start_seq_num;
1982 } __packed bar_data;
1983
71364716 1984 if (!rx->sta)
a02ae758 1985 return RX_DROP_MONITOR;
8ae5977f
JB		 1986
1987 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1988 &bar_data, sizeof(bar_data)))
1989 return RX_DROP_MONITOR;
1990
8ae5977f 1991 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1992
1993 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1994 if (!tid_agg_rx)
a02ae758 1995 return RX_DROP_MONITOR;
71364716 1996
8ae5977f 1997 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1998
1999 /* reset session timer */
20ad19d0
JB		 2000 if (tid_agg_rx->timeout)
2001 mod_timer(&tid_agg_rx->session_timer,
2002 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2003
dd318575 2004 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2005 /* release stored frames up to start of BAR */
24a8fdad 2006 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2007 spin_unlock(&tid_agg_rx->reorder_lock);
2008
a02ae758
JB		 2009 kfree_skb(skb);
2010 return RX_QUEUED;
71364716
RR		 2011 }
2012
08daecae
JB		 2013 /*
2014 * After this point, we only want management frames,
2015 * so we can drop all remaining control frames to
2016 * cooked monitor interfaces.
2017 */
2018 return RX_DROP_MONITOR;
71364716
RR		 2019}
2020
f4f727a6
JM		 2021static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2022 struct ieee80211_mgmt *mgmt,
2023 size_t len)
fea14732
JM		 2024{
2025 struct ieee80211_local *local = sdata->local;
2026 struct sk_buff *skb;
2027 struct ieee80211_mgmt *resp;
2028
47846c9b 2029 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2030 /* Not to own unicast address */
2031 return;
2032 }
2033
46900298
JB		 2034 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2035 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2036 /* Not from the current AP or not associated yet. */
fea14732
JM		 2037 return;
2038 }
2039
2040 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2041 /* Too short SA Query request frame */
2042 return;
2043 }
2044
2045 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2046 if (skb == NULL)
2047 return;
2048
2049 skb_reserve(skb, local->hw.extra_tx_headroom);
2050 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2051 memset(resp, 0, 24);
2052 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2053 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2054 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2055 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2056 IEEE80211_STYPE_ACTION);
2057 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2058 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2059 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2060 memcpy(resp->u.action.u.sa_query.trans_id,
2061 mgmt->u.action.u.sa_query.trans_id,
2062 WLAN_SA_QUERY_TR_ID_LEN);
2063
62ae67be 2064 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2065}
2066
2e161f78
JB		 2067static ieee80211_rx_result debug_noinline
2068ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2069{
2070 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2071 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2072
2073 /*
2074 * From here on, look only at management frames.
2075 * Data and control frames are already handled,
2076 * and unknown (reserved) frames are useless.
2077 */
2078 if (rx->skb->len < 24)
2079 return RX_DROP_MONITOR;
2080
2081 if (!ieee80211_is_mgmt(mgmt->frame_control))
2082 return RX_DROP_MONITOR;
2083
554891e6 2084 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2085 return RX_DROP_MONITOR;
2086
2087 if (ieee80211_drop_unencrypted_mgmt(rx))
2088 return RX_DROP_UNUSABLE;
2089
2090 return RX_CONTINUE;
2091}
2092
de1ede7a
JB		 2093static ieee80211_rx_result debug_noinline
2094ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2095{
2096 struct ieee80211_local *local = rx->local;
eb9fb5b8 2097 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2098 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2099 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2100 int len = rx->skb->len;
2101
2102 if (!ieee80211_is_action(mgmt->frame_control))
2103 return RX_CONTINUE;
2104
026331c4
JM		 2105 /* drop too small frames */
2106 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2107 return RX_DROP_UNUSABLE;
de1ede7a 2108
026331c4 2109 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2110 return RX_DROP_UNUSABLE;
de1ede7a 2111
554891e6 2112 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2113 return RX_DROP_UNUSABLE;
97ebe12a 2114
de1ede7a
JB		 2115 switch (mgmt->u.action.category) {
2116 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2117 /*
2118 * The aggregation code is not prepared to handle
2119 * anything but STA/AP due to the BSSID handling;
2120 * IBSS could work in the code but isn't supported
2121 * by drivers or the standard.
2122 */
2123 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2124 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2125 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2126 break;
8abd3f9b 2127
026331c4
JM		 2128 /* verify action_code is present */
2129 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2130 break;
2131
de1ede7a
JB		 2132 switch (mgmt->u.action.u.addba_req.action_code) {
2133 case WLAN_ACTION_ADDBA_REQ:
2134 if (len < (IEEE80211_MIN_ACTION_SIZE +
2135 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2136 goto invalid;
2137 break;
de1ede7a
JB		 2138 case WLAN_ACTION_ADDBA_RESP:
2139 if (len < (IEEE80211_MIN_ACTION_SIZE +
2140 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2141 goto invalid;
2142 break;
de1ede7a
JB		 2143 case WLAN_ACTION_DELBA:
2144 if (len < (IEEE80211_MIN_ACTION_SIZE +
2145 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2146 goto invalid;
2147 break;
2148 default:
2149 goto invalid;
de1ede7a 2150 }
bed7ee6e 2151
8b58ff83 2152 goto queue;
39192c0b
JB		 2153 case WLAN_CATEGORY_SPECTRUM_MGMT:
2154 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2155 break;
46900298
JB		 2156
2157 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2158 break;
46900298 2159
026331c4
JM		 2160 /* verify action_code is present */
2161 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2162 break;
2163
39192c0b
JB		 2164 switch (mgmt->u.action.u.measurement.action_code) {
2165 case WLAN_ACTION_SPCT_MSR_REQ:
2166 if (len < (IEEE80211_MIN_ACTION_SIZE +
2167 sizeof(mgmt->u.action.u.measurement)))
84040805 2168 break;
39192c0b 2169 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2170 goto handled;
c481ec97
S		 2171 case WLAN_ACTION_SPCT_CHL_SWITCH:
2172 if (len < (IEEE80211_MIN_ACTION_SIZE +
2173 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2174 break;
c481ec97 2175
cc32abd4 2176 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2177 break;
cc32abd4 2178
46900298 2179 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2180 break;
c481ec97 2181
8b58ff83 2182 goto queue;
39192c0b
JB		 2183 }
2184 break;
fea14732
JM		 2185 case WLAN_CATEGORY_SA_QUERY:
2186 if (len < (IEEE80211_MIN_ACTION_SIZE +
2187 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2188 break;
2189
fea14732
JM		 2190 switch (mgmt->u.action.u.sa_query.action) {
2191 case WLAN_ACTION_SA_QUERY_REQUEST:
2192 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2193 break;
fea14732 2194 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2195 goto handled;
fea14732
JM		 2196 }
2197 break;
97ad9139 2198 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2199 if (!ieee80211_vif_is_mesh(&sdata->vif))
2200 break;
8b58ff83 2201 goto queue;
c7108a71
JC		 2202 case WLAN_CATEGORY_MESH_PATH_SEL:
2203 if (!mesh_path_sel_is_hwmp(sdata))
2204 break;
2205 goto queue;
84040805 2206 }
026331c4 2207
2e161f78
JB		 2208 return RX_CONTINUE;
2209
bed7ee6e 2210 invalid:
554891e6 2211 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2212 /* will return in the next handlers */
2213 return RX_CONTINUE;
2214
2215 handled:
2216 if (rx->sta)
2217 rx->sta->rx_packets++;
2218 dev_kfree_skb(rx->skb);
2219 return RX_QUEUED;
2220
2221 queue:
2222 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2223 skb_queue_tail(&sdata->skb_queue, rx->skb);
2224 ieee80211_queue_work(&local->hw, &sdata->work);
2225 if (rx->sta)
2226 rx->sta->rx_packets++;
2227 return RX_QUEUED;
2228}
2229
2230static ieee80211_rx_result debug_noinline
2231ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2232{
554891e6 2233 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2234
2235 /* skip known-bad action frames and return them in the next handler */
554891e6 2236 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2237 return RX_CONTINUE;
d7907448 2238
026331c4
JM		 2239 /*
2240 * Getting here means the kernel doesn't know how to handle
2241 * it, but maybe userspace does ... include returned frames
2242 * so userspace can register for those to know whether ones
2243 * it transmitted were processed or returned.
2244 */
026331c4 2245
2e161f78
JB		 2246 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2247 rx->skb->data, rx->skb->len,
2248 GFP_ATOMIC)) {
2249 if (rx->sta)
2250 rx->sta->rx_packets++;
2251 dev_kfree_skb(rx->skb);
2252 return RX_QUEUED;
2253 }
2254
2255
2256 return RX_CONTINUE;
2257}
2258
2259static ieee80211_rx_result debug_noinline
2260ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2261{
2262 struct ieee80211_local *local = rx->local;
2263 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2264 struct sk_buff *nskb;
2265 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2266 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2267
2268 if (!ieee80211_is_action(mgmt->frame_control))
2269 return RX_CONTINUE;
2270
2271 /*
2272 * For AP mode, hostapd is responsible for handling any action
2273 * frames that we didn't handle, including returning unknown
2274 * ones. For all other modes we will return them to the sender,
2275 * setting the 0x80 bit in the action category, as required by
2276 * 802.11-2007 7.3.1.11.
2277 * Newer versions of hostapd shall also use the management frame
2278 * registration mechanisms, but older ones still use cooked
2279 * monitor interfaces so push all frames there.
2280 */
554891e6 2281 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2282 (sdata->vif.type == NL80211_IFTYPE_AP ||
2283 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2284 return RX_DROP_MONITOR;
026331c4 2285
84040805
JB		 2286 /* do not return rejected action frames */
2287 if (mgmt->u.action.category & 0x80)
2288 return RX_DROP_UNUSABLE;
2289
2290 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2291 GFP_ATOMIC);
2292 if (nskb) {
292b4df6 2293 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2294
292b4df6
JL		 2295 nmgmt->u.action.category |= 0x80;
2296 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2297 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2298
2299 memset(nskb->cb, 0, sizeof(nskb->cb));
2300
2301 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2302 }
39192c0b
JB		 2303 dev_kfree_skb(rx->skb);
2304 return RX_QUEUED;
de1ede7a
JB		 2305}
2306
49461622 2307static ieee80211_rx_result debug_noinline
5cf121c3 2308ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2309{
eb9fb5b8 2310 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2311 ieee80211_rx_result rxs;
77a121c3
JB		 2312 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2313 __le16 stype;
571ecf67 2314
af6b6374
JB		 2315 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2316 if (rxs != RX_CONTINUE)
2317 return rxs;
2318
77a121c3 2319 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2320
77a121c3
JB		 2321 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2322 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2323 sdata->vif.type != NL80211_IFTYPE_STATION)
2324 return RX_DROP_MONITOR;
472dbc45 2325
77a121c3
JB		 2326 switch (stype) {
2327 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2328 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2329 /* process for all: mesh, mlme, ibss */
2330 break;
2331 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2332 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2333 if (is_multicast_ether_addr(mgmt->da) &&
2334 !is_broadcast_ether_addr(mgmt->da))
2335 return RX_DROP_MONITOR;
2336
77a121c3
JB		 2337 /* process only for station */
2338 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2339 return RX_DROP_MONITOR;
2340 break;
2341 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2342 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2343 /* process only for ibss */
2344 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2345 return RX_DROP_MONITOR;
2346 break;
2347 default:
2348 return RX_DROP_MONITOR;
2349 }
f9d540ee 2350
77a121c3 2351 /* queue up frame and kick off work to process it */
c1475ca9 2352 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2353 skb_queue_tail(&sdata->skb_queue, rx->skb);
2354 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2355 if (rx->sta)
2356 rx->sta->rx_packets++;
46900298 2357
77a121c3 2358 return RX_QUEUED;
571ecf67
JB		 2359}
2360
3b8d81e0 2361static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2362 struct ieee80211_rx_data *rx)
571ecf67 2363{
a7767f95
HH		 2364 int keyidx;
2365 unsigned int hdrlen;
571ecf67 2366
a7767f95 2367 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2368 if (rx->skb->len >= hdrlen + 4)
2369 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2370 else
2371 keyidx = -1;
2372
8944b79f 2373 if (!rx->sta) {
aa0daf0e
JB		 2374 /*
2375 * Some hardware seem to generate incorrect Michael MIC
2376 * reports; ignore them to avoid triggering countermeasures.
2377 */
af2ced6a 2378 return;
571ecf67
JB		 2379 }
2380
a7767f95 2381 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2382 return;
571ecf67 2383
05c914fe 2384 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2385 /*
2386 * APs with pairwise keys should never receive Michael MIC
2387 * errors for non-zero keyidx because these are reserved for
2388 * group keys and only the AP is sending real multicast
2389 * frames in the BSS.
2390 */
af2ced6a 2391 return;
571ecf67
JB		 2392 }
2393
a7767f95
HH		 2394 if (!ieee80211_is_data(hdr->frame_control) &&
2395 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2396 return;
571ecf67 2397
e6d6e342
JB		 2398 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2399 GFP_ATOMIC);
571ecf67
JB		 2400}
2401
5cf121c3 2402/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2403static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2404 struct ieee80211_rate *rate)
3d30d949
MW		 2405{
2406 struct ieee80211_sub_if_data *sdata;
2407 struct ieee80211_local *local = rx->local;
2408 struct ieee80211_rtap_hdr {
2409 struct ieee80211_radiotap_header hdr;
2410 u8 flags;
5f0b7de5 2411 u8 rate_or_pad;
3d30d949
MW		 2412 __le16 chan_freq;
2413 __le16 chan_flags;
bc10502d 2414 } __packed *rthdr;
3d30d949
MW		 2415 struct sk_buff *skb = rx->skb, *skb2;
2416 struct net_device *prev_dev = NULL;
eb9fb5b8 2417 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2418
554891e6
JB		 2419 /*
2420 * If cooked monitor has been processed already, then
2421 * don't do it again. If not, set the flag.
2422 */
2423 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2424 goto out_free_skb;
554891e6 2425 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2426
3d30d949
MW		 2427 if (skb_headroom(skb) < sizeof(*rthdr) &&
2428 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2429 goto out_free_skb;
2430
2431 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2432 memset(rthdr, 0, sizeof(*rthdr));
2433 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2434 rthdr->hdr.it_present =
2435 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2436 (1 << IEEE80211_RADIOTAP_CHANNEL));
2437
5f0b7de5
JB		 2438 if (rate) {
2439 rthdr->rate_or_pad = rate->bitrate / 5;
2440 rthdr->hdr.it_present |=
2441 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2442 }
3d30d949
MW		 2443 rthdr->chan_freq = cpu_to_le16(status->freq);
2444
2445 if (status->band == IEEE80211_BAND_5GHZ)
2446 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2447 IEEE80211_CHAN_5GHZ);
2448 else
2449 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2450 IEEE80211_CHAN_2GHZ);
2451
2452 skb_set_mac_header(skb, 0);
2453 skb->ip_summed = CHECKSUM_UNNECESSARY;
2454 skb->pkt_type = PACKET_OTHERHOST;
2455 skb->protocol = htons(ETH_P_802_2);
2456
2457 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2458 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2459 continue;
2460
05c914fe 2461 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2462 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2463 continue;
2464
2465 if (prev_dev) {
2466 skb2 = skb_clone(skb, GFP_ATOMIC);
2467 if (skb2) {
2468 skb2->dev = prev_dev;
5548a8a1 2469 netif_receive_skb(skb2);
3d30d949
MW		 2470 }
2471 }
2472
2473 prev_dev = sdata->dev;
2474 sdata->dev->stats.rx_packets++;
2475 sdata->dev->stats.rx_bytes += skb->len;
2476 }
2477
2478 if (prev_dev) {
2479 skb->dev = prev_dev;
5548a8a1 2480 netif_receive_skb(skb);
554891e6
JB		 2481 return;
2482 }
3d30d949
MW		 2483
2484 out_free_skb:
2485 dev_kfree_skb(skb);
2486}
2487
aa0c8636
CL		 2488static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2489 ieee80211_rx_result res)
2490{
2491 switch (res) {
2492 case RX_DROP_MONITOR:
2493 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2494 if (rx->sta)
2495 rx->sta->rx_dropped++;
2496 /* fall through */
2497 case RX_CONTINUE: {
2498 struct ieee80211_rate *rate = NULL;
2499 struct ieee80211_supported_band *sband;
2500 struct ieee80211_rx_status *status;
2501
2502 status = IEEE80211_SKB_RXCB((rx->skb));
2503
2504 sband = rx->local->hw.wiphy->bands[status->band];
2505 if (!(status->flag & RX_FLAG_HT))
2506 rate = &sband->bitrates[status->rate_idx];
2507
2508 ieee80211_rx_cooked_monitor(rx, rate);
2509 break;
2510 }
2511 case RX_DROP_UNUSABLE:
2512 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2513 if (rx->sta)
2514 rx->sta->rx_dropped++;
2515 dev_kfree_skb(rx->skb);
2516 break;
2517 case RX_QUEUED:
2518 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2519 break;
2520 }
2521}
571ecf67 2522
24a8fdad 2523static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2524{
58905290 2525 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2526 struct sk_buff *skb;
8944b79f 2527
e32f85f7
LCC		 2528#define CALL_RXH(rxh) \
2529 do { \
2530 res = rxh(rx); \
2531 if (res != RX_CONTINUE) \
2569a826 2532 goto rxh_next; \
e32f85f7 2533 } while (0);
49461622 2534
24a8fdad
CL		 2535 spin_lock(&rx->local->rx_skb_queue.lock);
2536 if (rx->local->running_rx_handler)
2537 goto unlock;
2538
2539 rx->local->running_rx_handler = true;
2540
2541 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2542 spin_unlock(&rx->local->rx_skb_queue.lock);
2543
2569a826
JB		 2544 /*
2545 * all the other fields are valid across frames
2546 * that belong to an aMPDU since they are on the
2547 * same TID from the same station
2548 */
2549 rx->skb = skb;
554891e6 2550 rx->flags = 0;
2569a826
JB		 2551
2552 CALL_RXH(ieee80211_rx_h_decrypt)
2553 CALL_RXH(ieee80211_rx_h_check_more_data)
2554 CALL_RXH(ieee80211_rx_h_sta_process)
2555 CALL_RXH(ieee80211_rx_h_defragment)
2556 CALL_RXH(ieee80211_rx_h_ps_poll)
2557 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2558 /* must be after MMIC verify so header is counted in MPDU mic */
2559 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2560 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2561#ifdef CONFIG_MAC80211_MESH
aa0c8636 2562 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2563 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2564#endif
2569a826 2565 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2566 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2567 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2568 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2569 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2570 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2571 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2572
aa0c8636
CL		 2573 rxh_next:
2574 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2575 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2576#undef CALL_RXH
aa0c8636 2577 }
24a8fdad
CL		 2578
2579 rx->local->running_rx_handler = false;
2580
2581 unlock:
2582 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2583}
2584
4406c376 2585static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2586{
aa0c8636
CL		 2587 ieee80211_rx_result res = RX_DROP_MONITOR;
2588
aa0c8636
CL		 2589#define CALL_RXH(rxh) \
2590 do { \
2591 res = rxh(rx); \
2592 if (res != RX_CONTINUE) \
2593 goto rxh_next; \
2594 } while (0);
2595
2596 CALL_RXH(ieee80211_rx_h_passive_scan)
2597 CALL_RXH(ieee80211_rx_h_check)
2598
24a8fdad 2599 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2600
24a8fdad 2601 ieee80211_rx_handlers(rx);
aa0c8636 2602 return;
49461622 2603
2569a826 2604 rxh_next:
aa0c8636
CL		 2605 ieee80211_rx_handlers_result(rx, res);
2606
2607#undef CALL_RXH
58905290
JB		 2608}
2609
2bff8ebf 2610/*
dd318575
JB		 2611 * This function makes calls into the RX path, therefore
2612 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2613 */
2614void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2615{
554891e6
JB		 2616 struct ieee80211_rx_data rx = {
2617 .sta = sta,
2618 .sdata = sta->sdata,
2619 .local = sta->local,
2620 .queue = tid,
2621 };
2c15a0cf
CL		 2622 struct tid_ampdu_rx *tid_agg_rx;
2623
2624 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2625 if (!tid_agg_rx)
2626 return;
2bff8ebf 2627
2c15a0cf 2628 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2629 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2630 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2631
24a8fdad 2632 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2633}
2634
571ecf67
JB		 2635/* main receive path */
2636
20b01f80 2637static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2638 struct ieee80211_hdr *hdr)
2639{
20b01f80 2640 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2641 struct sk_buff *skb = rx->skb;
2642 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2643 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2644 int multicast = is_multicast_ether_addr(hdr->addr1);
2645
51fb61e7 2646 switch (sdata->vif.type) {
05c914fe 2647 case NL80211_IFTYPE_STATION:
9bc383de 2648 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2649 return 0;
77fdaa12 2650 if (!multicast &&
47846c9b 2651 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2652 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2653 return 0;
554891e6 2654 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2655 }
2656 break;
05c914fe 2657 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2658 if (!bssid)
2659 return 0;
a7767f95 2660 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2661 return 1;
87291c02 2662 }
46900298 2663 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2664 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2665 return 0;
554891e6 2666 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2667 } else if (!multicast &&
47846c9b 2668 compare_ether_addr(sdata->vif.addr,
23a24def 2669 hdr->addr1) != 0) {
4150c572 2670 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2671 return 0;
554891e6 2672 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2673 } else if (!rx->sta) {
2674 int rate_idx;
eb9fb5b8 2675 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2676 rate_idx = 0; /* TODO: HT rates */
2677 else
eb9fb5b8 2678 rate_idx = status->rate_idx;
34e89507
JB		 2679 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2680 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2681 }
23a24def 2682 break;
05c914fe 2683 case NL80211_IFTYPE_MESH_POINT:
6032f934 2684 if (!multicast &&
47846c9b 2685 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2686 hdr->addr1) != 0) {
2687 if (!(sdata->dev->flags & IFF_PROMISC))
2688 return 0;
2689
554891e6 2690 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2691 }
2692 break;
05c914fe
JB		 2693 case NL80211_IFTYPE_AP_VLAN:
2694 case NL80211_IFTYPE_AP:
23a24def 2695 if (!bssid) {
47846c9b 2696 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2697 hdr->addr1))
2698 return 0;
2699 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2700 sdata->vif.addr)) {
771bbd09
AN		 2701 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2702 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2703 return 0;
554891e6 2704 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2705 }
23a24def 2706 break;
05c914fe 2707 case NL80211_IFTYPE_WDS:
a7767f95 2708 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2709 return 0;
2710 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2711 return 0;
2712 break;
2ca27bcf 2713 default:
fb1c1cd6
JB		 2714 /* should never get here */
2715 WARN_ON(1);
2716 break;
23a24def
JB		 2717 }
2718
2719 return 1;
2720}
2721
4406c376
JB		 2722/*
2723 * This function returns whether or not the SKB
2724 * was destined for RX processing or not, which,
2725 * if consume is true, is equivalent to whether
2726 * or not the skb was consumed.
2727 */
2728static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2729 struct sk_buff *skb, bool consume)
2730{
2731 struct ieee80211_local *local = rx->local;
2732 struct ieee80211_sub_if_data *sdata = rx->sdata;
2733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2734 struct ieee80211_hdr *hdr = (void *)skb->data;
2735 int prepares;
2736
2737 rx->skb = skb;
554891e6 2738 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2739 prepares = prepare_for_handlers(rx, hdr);
2740
2741 if (!prepares)
2742 return false;
2743
2744 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2745 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2746 ieee80211_rx_michael_mic_report(hdr, rx);
2747 return false;
2748 }
2749
2750 if (!consume) {
2751 skb = skb_copy(skb, GFP_ATOMIC);
2752 if (!skb) {
2753 if (net_ratelimit())
2754 wiphy_debug(local->hw.wiphy,
b305dae4 2755 "failed to copy skb for %s\n",
4406c376
JB		 2756 sdata->name);
2757 return true;
2758 }
2759
2760 rx->skb = skb;
2761 }
2762
2763 ieee80211_invoke_rx_handlers(rx);
2764 return true;
2765}
2766
571ecf67 2767/*
6368e4b1
RR		 2768 * This is the actual Rx frames handler. as it blongs to Rx path it must
2769 * be called with rcu_read_lock protection.
571ecf67 2770 */
71ebb4aa 2771static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2772 struct sk_buff *skb)
571ecf67 2773{
554891e6 2774 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2775 struct ieee80211_local *local = hw_to_local(hw);
2776 struct ieee80211_sub_if_data *sdata;
571ecf67 2777 struct ieee80211_hdr *hdr;
e3cf8b3f 2778 __le16 fc;
5cf121c3 2779 struct ieee80211_rx_data rx;
4406c376 2780 struct ieee80211_sub_if_data *prev;
56af3268 2781 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2782 int err = 0;
571ecf67 2783
e3cf8b3f 2784 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2785 memset(&rx, 0, sizeof(rx));
2786 rx.skb = skb;
2787 rx.local = local;
72abd81b 2788
e3cf8b3f 2789 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2790 local->dot11ReceivedFragmentCount++;
571ecf67 2791
142b9f50
HS		 2792 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2793 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2794 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2795
e3cf8b3f
ZY		 2796 if (ieee80211_is_mgmt(fc))
2797 err = skb_linearize(skb);
2798 else
2799 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2800
2801 if (err) {
2802 dev_kfree_skb(skb);
2803 return;
2804 }
2805
2806 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2807 ieee80211_parse_qos(&rx);
d1c3a37c 2808 ieee80211_verify_alignment(&rx);
38f3714d 2809
e3cf8b3f 2810 if (ieee80211_is_data(fc)) {
56af3268 2811 prev_sta = NULL;
4406c376 2812
abe60632 2813 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2814 if (!prev_sta) {
2815 prev_sta = sta;
2816 continue;
2817 }
2818
2819 rx.sta = prev_sta;
2820 rx.sdata = prev_sta->sdata;
4406c376 2821 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2822
56af3268 2823 prev_sta = sta;
4406c376 2824 }
56af3268
BG		 2825
2826 if (prev_sta) {
2827 rx.sta = prev_sta;
2828 rx.sdata = prev_sta->sdata;
2829
4406c376 2830 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2831 return;
8e26d5ad 2832 goto out;
56af3268 2833 }
4406c376
JB		 2834 }
2835
4b0dd98e 2836 prev = NULL;
b2e7771e 2837
4b0dd98e
JB		 2838 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2839 if (!ieee80211_sdata_running(sdata))
2840 continue;
340e11f3 2841
4b0dd98e
JB		 2842 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2843 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2844 continue;
340e11f3 2845
4b0dd98e
JB		 2846 /*
2847 * frame is destined for this interface, but if it's
2848 * not also for the previous one we handle that after
2849 * the loop to avoid copying the SKB once too much
2850 */
4bb29f8c 2851
4b0dd98e 2852 if (!prev) {
abe60632 2853 prev = sdata;
4b0dd98e 2854 continue;
340e11f3 2855 }
4bb29f8c 2856
4b0dd98e
JB		 2857 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2858 rx.sdata = prev;
2859 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2860
4b0dd98e
JB		 2861 prev = sdata;
2862 }
2863
2864 if (prev) {
2865 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2866 rx.sdata = prev;
4406c376 2867
4b0dd98e
JB		 2868 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2869 return;
571ecf67 2870 }
4406c376 2871
8e26d5ad 2872 out:
4406c376 2873 dev_kfree_skb(skb);
571ecf67 2874}
6368e4b1
RR		 2875
2876/*
2877 * This is the receive path handler. It is called by a low level driver when an
2878 * 802.11 MPDU is received from the hardware.
2879 */
103bf9f7 2880void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2881{
2882 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2883 struct ieee80211_rate *rate = NULL;
2884 struct ieee80211_supported_band *sband;
f1d58c25 2885 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2886
d20ef63d
JB		 2887 WARN_ON_ONCE(softirq_count() == 0);
2888
77a980dc
JB		 2889 if (WARN_ON(status->band < 0 ||
2890 status->band >= IEEE80211_NUM_BANDS))
2891 goto drop;
8318d78a
JB		 2892
2893 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2894 if (WARN_ON(!sband))
2895 goto drop;
8318d78a 2896
89c3a8ac
JB		 2897 /*
2898 * If we're suspending, it is possible although not too likely
2899 * that we'd be receiving frames after having already partially
2900 * quiesced the stack. We can't process such frames then since
2901 * that might, for example, cause stations to be added or other
2902 * driver callbacks be invoked.
2903 */
77a980dc
JB		 2904 if (unlikely(local->quiescing || local->suspended))
2905 goto drop;
89c3a8ac 2906
ea77f12f
JB		 2907 /*
2908 * The same happens when we're not even started,
2909 * but that's worth a warning.
2910 */
77a980dc
JB		 2911 if (WARN_ON(!local->started))
2912 goto drop;
ea77f12f 2913
fc885189 2914 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2915 /*
fc885189
JB		 2916 * Validate the rate, unless a PLCP error means that
2917 * we probably can't have a valid rate here anyway.
e5d6eb83 2918 */
fc885189
JB		 2919
2920 if (status->flag & RX_FLAG_HT) {
2921 /*
2922 * rate_idx is MCS index, which can be [0-76]
2923 * as documented on:
2924 *
2925 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2926 *
2927 * Anything else would be some sort of driver or
2928 * hardware error. The driver should catch hardware
2929 * errors.
2930 */
2931 if (WARN((status->rate_idx < 0 ||
2932 status->rate_idx > 76),
2933 "Rate marked as an HT rate but passed "
2934 "status->rate_idx is not "
2935 "an MCS index [0-76]: %d (0x%02x)\n",
2936 status->rate_idx,
2937 status->rate_idx))
2938 goto drop;
2939 } else {
2940 if (WARN_ON(status->rate_idx < 0 ||
2941 status->rate_idx >= sband->n_bitrates))
2942 goto drop;
2943 rate = &sband->bitrates[status->rate_idx];
2944 }
0fb8ca45 2945 }
6368e4b1 2946
554891e6
JB		 2947 status->rx_flags = 0;
2948
6368e4b1
RR		 2949 /*
2950 * key references and virtual interfaces are protected using RCU
2951 * and this requires that we are in a read-side RCU section during
2952 * receive processing
2953 */
2954 rcu_read_lock();
2955
2956 /*
2957 * Frames with failed FCS/PLCP checksum are not returned,
2958 * all other frames are returned without radiotap header
2959 * if it was previously present.
2960 * Also, frames with less than 16 bytes are dropped.
2961 */
f1d58c25 2962 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2963 if (!skb) {
2964 rcu_read_unlock();
2965 return;
2966 }
2967
e1e54068
JB		 2968 ieee80211_tpt_led_trig_rx(local,
2969 ((struct ieee80211_hdr *)skb->data)->frame_control,
2970 skb->len);
071d9ac2 2971 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2972
2973 rcu_read_unlock();
77a980dc
JB		 2974
2975 return;
2976 drop:
2977 kfree_skb(skb);
6368e4b1 2978}
103bf9f7 2979EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2980
2981/* This is a version of the rx handler that can be called from hard irq
2982 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2983void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2984{
2985 struct ieee80211_local *local = hw_to_local(hw);
2986
2987 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2988
571ecf67
JB		 2989 skb->pkt_type = IEEE80211_RX_MSG;
2990 skb_queue_tail(&local->skb_queue, skb);
2991 tasklet_schedule(&local->tasklet);
2992}
2993EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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